| 1 | |
| 2 | |
| 3 | * Security plug functions
|
| 4 | *
|
| 5 | * Copyright (C) 2001 WireX Communications, Inc <[email protected]>
|
| 6 | * Copyright (C) 2001-2002 Greg Kroah-Hartman <[email protected]>
|
| 7 | * Copyright (C) 2001 Networks Associates Technology, Inc <[email protected]>
|
| 8 | * Copyright (C) 2016 Mellanox Technologies
|
| 9 | * Copyright (C) 2023 Microsoft Corporation <[email protected]>
|
| 10 |
|
| 11 |
|
| 12 | #define pr_fmt(fmt) "LSM: " fmt
|
| 13 |
|
| 14 | #include <linux/bpf.h>
|
| 15 | #include <linux/capability.h>
|
| 16 | #include <linux/dcache.h>
|
| 17 | #include <linux/export.h>
|
| 18 | #include <linux/init.h>
|
| 19 | #include <linux/kernel.h>
|
| 20 | #include <linux/kernel_read_file.h>
|
| 21 | #include <linux/lsm_hooks.h>
|
| 22 | #include <linux/integrity.h>
|
| 23 | #include <linux/ima.h>
|
| 24 | #include <linux/evm.h>
|
| 25 | #include <linux/fsnotify.h>
|
| 26 | #include <linux/mman.h>
|
| 27 | #include <linux/mount.h>
|
| 28 | #include <linux/personality.h>
|
| 29 | #include <linux/backing-dev.h>
|
| 30 | #include <linux/string.h>
|
| 31 | #include <linux/msg.h>
|
| 32 | #include <linux/overflow.h>
|
| 33 | #include <net/flow.h>
|
| 34 |
|
| 35 |
|
| 36 | #define LSM_COUNT (__end_lsm_info - __start_lsm_info)
|
| 37 |
|
| 38 | |
| 39 | * How many LSMs are built into the kernel as determined at
|
| 40 | * build time. Used to determine fixed array sizes.
|
| 41 | * The capability module is accounted for by CONFIG_SECURITY
|
| 42 |
|
| 43 | #define LSM_CONFIG_COUNT ( \
|
| 44 | (IS_ENABLED(CONFIG_SECURITY) ? 1 : 0) + \
|
| 45 | (IS_ENABLED(CONFIG_SECURITY_SELINUX) ? 1 : 0) + \
|
| 46 | (IS_ENABLED(CONFIG_SECURITY_SMACK) ? 1 : 0) + \
|
| 47 | (IS_ENABLED(CONFIG_SECURITY_TOMOYO) ? 1 : 0) + \
|
| 48 | (IS_ENABLED(CONFIG_SECURITY_APPARMOR) ? 1 : 0) + \
|
| 49 | (IS_ENABLED(CONFIG_SECURITY_YAMA) ? 1 : 0) + \
|
| 50 | (IS_ENABLED(CONFIG_SECURITY_LOADPIN) ? 1 : 0) + \
|
| 51 | (IS_ENABLED(CONFIG_SECURITY_SAFESETID) ? 1 : 0) + \
|
| 52 | (IS_ENABLED(CONFIG_SECURITY_LOCKDOWN_LSM) ? 1 : 0) + \
|
| 53 | (IS_ENABLED(CONFIG_BPF_LSM) ? 1 : 0) + \
|
| 54 | (IS_ENABLED(CONFIG_SECURITY_LANDLOCK) ? 1 : 0))
|
| 55 |
|
| 56 | |
| 57 | * These are descriptions of the reasons that can be passed to the
|
| 58 | * security_locked_down() LSM hook. Placing this array here allows
|
| 59 | * all security modules to use the same descriptions for auditing
|
| 60 | * purposes.
|
| 61 |
|
| 62 | const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX + 1] = {
|
| 63 | [LOCKDOWN_NONE] = "none",
|
| 64 | [LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading",
|
| 65 | [LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port",
|
| 66 | [LOCKDOWN_EFI_TEST] = "/dev/efi_test access",
|
| 67 | [LOCKDOWN_KEXEC] = "kexec of unsigned images",
|
| 68 | [LOCKDOWN_HIBERNATION] = "hibernation",
|
| 69 | [LOCKDOWN_PCI_ACCESS] = "direct PCI access",
|
| 70 | [LOCKDOWN_IOPORT] = "raw io port access",
|
| 71 | [LOCKDOWN_MSR] = "raw MSR access",
|
| 72 | [LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables",
|
| 73 | [LOCKDOWN_DEVICE_TREE] = "modifying device tree contents",
|
| 74 | [LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage",
|
| 75 | [LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO",
|
| 76 | [LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters",
|
| 77 | [LOCKDOWN_MMIOTRACE] = "unsafe mmio",
|
| 78 | [LOCKDOWN_DEBUGFS] = "debugfs access",
|
| 79 | [LOCKDOWN_XMON_WR] = "xmon write access",
|
| 80 | [LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM",
|
| 81 | [LOCKDOWN_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM",
|
| 82 | [LOCKDOWN_RTAS_ERROR_INJECTION] = "RTAS error injection",
|
| 83 | [LOCKDOWN_INTEGRITY_MAX] = "integrity",
|
| 84 | [LOCKDOWN_KCORE] = "/proc/kcore access",
|
| 85 | [LOCKDOWN_KPROBES] = "use of kprobes",
|
| 86 | [LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM",
|
| 87 | [LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM",
|
| 88 | [LOCKDOWN_PERF] = "unsafe use of perf",
|
| 89 | [LOCKDOWN_TRACEFS] = "use of tracefs",
|
| 90 | [LOCKDOWN_XMON_RW] = "xmon read and write access",
|
| 91 | [LOCKDOWN_XFRM_SECRET] = "xfrm SA secret",
|
| 92 | [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
|
| 93 | };
|
| 94 |
|
| 95 | struct security_hook_heads security_hook_heads __ro_after_init;
|
| 96 | static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain);
|
| 97 |
|
| 98 | static struct kmem_cache *lsm_file_cache;
|
| 99 | static struct kmem_cache *lsm_inode_cache;
|
| 100 |
|
| 101 | char *lsm_names;
|
| 102 | static struct lsm_blob_sizes blob_sizes __ro_after_init;
|
| 103 |
|
| 104 |
|
| 105 | static __initdata const char *chosen_lsm_order;
|
| 106 | static __initdata const char *chosen_major_lsm;
|
| 107 |
|
| 108 | static __initconst const char *const builtin_lsm_order = CONFIG_LSM;
|
| 109 |
|
| 110 |
|
| 111 | static __initdata struct lsm_info **ordered_lsms;
|
| 112 | static __initdata struct lsm_info *exclusive;
|
| 113 |
|
| 114 | static __initdata bool debug;
|
| 115 | #define init_debug(...) \
|
| 116 | do { \
|
| 117 | if (debug) \
|
| 118 | pr_info(__VA_ARGS__); \
|
| 119 | } while (0)
|
| 120 |
|
| 121 | static bool __init is_enabled(struct lsm_info *lsm)
|
| 122 | {
|
| 123 | if (!lsm->enabled)
|
| 124 | return false;
|
| 125 |
|
| 126 | return *lsm->enabled;
|
| 127 | }
|
| 128 |
|
| 129 |
|
| 130 | static int lsm_enabled_true __initdata = 1;
|
| 131 | static int lsm_enabled_false __initdata = 0;
|
| 132 | static void __init set_enabled(struct lsm_info *lsm, bool enabled)
|
| 133 | {
|
| 134 | |
| 135 | * When an LSM hasn't configured an enable variable, we can use
|
| 136 | * a hard-coded location for storing the default enabled state.
|
| 137 |
|
| 138 | if (!lsm->enabled) {
|
| 139 | if (enabled)
|
| 140 | lsm->enabled = &lsm_enabled_true;
|
| 141 | else
|
| 142 | lsm->enabled = &lsm_enabled_false;
|
| 143 | } else if (lsm->enabled == &lsm_enabled_true) {
|
| 144 | if (!enabled)
|
| 145 | lsm->enabled = &lsm_enabled_false;
|
| 146 | } else if (lsm->enabled == &lsm_enabled_false) {
|
| 147 | if (enabled)
|
| 148 | lsm->enabled = &lsm_enabled_true;
|
| 149 | } else {
|
| 150 | *lsm->enabled = enabled;
|
| 151 | }
|
| 152 | }
|
| 153 |
|
| 154 |
|
| 155 | static bool __init exists_ordered_lsm(struct lsm_info *lsm)
|
| 156 | {
|
| 157 | struct lsm_info **check;
|
| 158 |
|
| 159 | for (check = ordered_lsms; *check; check++)
|
| 160 | if (*check == lsm)
|
| 161 | return true;
|
| 162 |
|
| 163 | return false;
|
| 164 | }
|
| 165 |
|
| 166 |
|
| 167 | static int last_lsm __initdata;
|
| 168 | static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from)
|
| 169 | {
|
| 170 |
|
| 171 | if (exists_ordered_lsm(lsm))
|
| 172 | return;
|
| 173 |
|
| 174 | if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from))
|
| 175 | return;
|
| 176 |
|
| 177 |
|
| 178 | if (!lsm->enabled)
|
| 179 | lsm->enabled = &lsm_enabled_true;
|
| 180 | ordered_lsms[last_lsm++] = lsm;
|
| 181 |
|
| 182 | init_debug("%s ordered: %s (%s)\n", from, lsm->name,
|
| 183 | is_enabled(lsm) ? "enabled" : "disabled");
|
| 184 | }
|
| 185 |
|
| 186 |
|
| 187 | static bool __init lsm_allowed(struct lsm_info *lsm)
|
| 188 | {
|
| 189 |
|
| 190 | if (!is_enabled(lsm))
|
| 191 | return false;
|
| 192 |
|
| 193 |
|
| 194 | if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) {
|
| 195 | init_debug("exclusive disabled: %s\n", lsm->name);
|
| 196 | return false;
|
| 197 | }
|
| 198 |
|
| 199 | return true;
|
| 200 | }
|
| 201 |
|
| 202 | static void __init lsm_set_blob_size(int *need, int *lbs)
|
| 203 | {
|
| 204 | int offset;
|
| 205 |
|
| 206 | if (*need <= 0)
|
| 207 | return;
|
| 208 |
|
| 209 | offset = ALIGN(*lbs, sizeof(void *));
|
| 210 | *lbs = offset + *need;
|
| 211 | *need = offset;
|
| 212 | }
|
| 213 |
|
| 214 | static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
|
| 215 | {
|
| 216 | if (!needed)
|
| 217 | return;
|
| 218 |
|
| 219 | lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
|
| 220 | lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file);
|
| 221 | |
| 222 | * The inode blob gets an rcu_head in addition to
|
| 223 | * what the modules might need.
|
| 224 |
|
| 225 | if (needed->lbs_inode && blob_sizes.lbs_inode == 0)
|
| 226 | blob_sizes.lbs_inode = sizeof(struct rcu_head);
|
| 227 | lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode);
|
| 228 | lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc);
|
| 229 | lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
|
| 230 | lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock);
|
| 231 | lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task);
|
| 232 | lsm_set_blob_size(&needed->lbs_xattr_count,
|
| 233 | &blob_sizes.lbs_xattr_count);
|
| 234 | }
|
| 235 |
|
| 236 |
|
| 237 | static void __init prepare_lsm(struct lsm_info *lsm)
|
| 238 | {
|
| 239 | int enabled = lsm_allowed(lsm);
|
| 240 |
|
| 241 |
|
| 242 | set_enabled(lsm, enabled);
|
| 243 |
|
| 244 |
|
| 245 | if (enabled) {
|
| 246 | if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) {
|
| 247 | exclusive = lsm;
|
| 248 | init_debug("exclusive chosen: %s\n", lsm->name);
|
| 249 | }
|
| 250 |
|
| 251 | lsm_set_blob_sizes(lsm->blobs);
|
| 252 | }
|
| 253 | }
|
| 254 |
|
| 255 |
|
| 256 | static void __init initialize_lsm(struct lsm_info *lsm)
|
| 257 | {
|
| 258 | if (is_enabled(lsm)) {
|
| 259 | int ret;
|
| 260 |
|
| 261 | init_debug("initializing %s\n", lsm->name);
|
| 262 | ret = lsm->init();
|
| 263 | WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret);
|
| 264 | }
|
| 265 | }
|
| 266 |
|
| 267 | |
| 268 | * Current index to use while initializing the lsm id list.
|
| 269 |
|
| 270 | u32 lsm_active_cnt __ro_after_init;
|
| 271 | const struct lsm_id *lsm_idlist[LSM_CONFIG_COUNT];
|
| 272 |
|
| 273 |
|
| 274 | static void __init ordered_lsm_parse(const char *order, const char *origin)
|
| 275 | {
|
| 276 | struct lsm_info *lsm;
|
| 277 | char *sep, *name, *next;
|
| 278 |
|
| 279 |
|
| 280 | for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
|
| 281 | if (lsm->order == LSM_ORDER_FIRST)
|
| 282 | append_ordered_lsm(lsm, " first");
|
| 283 | }
|
| 284 |
|
| 285 |
|
| 286 | if (chosen_major_lsm) {
|
| 287 | struct lsm_info *major;
|
| 288 |
|
| 289 | |
| 290 | * To match the original "security=" behavior, this
|
| 291 | * explicitly does NOT fallback to another Legacy Major
|
| 292 | * if the selected one was separately disabled: disable
|
| 293 | * all non-matching Legacy Major LSMs.
|
| 294 |
|
| 295 | for (major = __start_lsm_info; major < __end_lsm_info;
|
| 296 | major++) {
|
| 297 | if ((major->flags & LSM_FLAG_LEGACY_MAJOR) &&
|
| 298 | strcmp(major->name, chosen_major_lsm) != 0) {
|
| 299 | set_enabled(major, false);
|
| 300 | init_debug("security=%s disabled: %s (only one legacy major LSM)\n",
|
| 301 | chosen_major_lsm, major->name);
|
| 302 | }
|
| 303 | }
|
| 304 | }
|
| 305 |
|
| 306 | sep = kstrdup(order, GFP_KERNEL);
|
| 307 | next = sep;
|
| 308 |
|
| 309 | while ((name = strsep(&next, ",")) != NULL) {
|
| 310 | bool found = false;
|
| 311 |
|
| 312 | for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
|
| 313 | if (strcmp(lsm->name, name) == 0) {
|
| 314 | if (lsm->order == LSM_ORDER_MUTABLE)
|
| 315 | append_ordered_lsm(lsm, origin);
|
| 316 | found = true;
|
| 317 | }
|
| 318 | }
|
| 319 |
|
| 320 | if (!found)
|
| 321 | init_debug("%s ignored: %s (not built into kernel)\n",
|
| 322 | origin, name);
|
| 323 | }
|
| 324 |
|
| 325 |
|
| 326 | if (chosen_major_lsm) {
|
| 327 | for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
|
| 328 | if (exists_ordered_lsm(lsm))
|
| 329 | continue;
|
| 330 | if (strcmp(lsm->name, chosen_major_lsm) == 0)
|
| 331 | append_ordered_lsm(lsm, "security=");
|
| 332 | }
|
| 333 | }
|
| 334 |
|
| 335 |
|
| 336 | for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
|
| 337 | if (lsm->order == LSM_ORDER_LAST)
|
| 338 | append_ordered_lsm(lsm, " last");
|
| 339 | }
|
| 340 |
|
| 341 |
|
| 342 | for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
|
| 343 | if (exists_ordered_lsm(lsm))
|
| 344 | continue;
|
| 345 | set_enabled(lsm, false);
|
| 346 | init_debug("%s skipped: %s (not in requested order)\n",
|
| 347 | origin, lsm->name);
|
| 348 | }
|
| 349 |
|
| 350 | kfree(sep);
|
| 351 | }
|
| 352 |
|
| 353 | static void __init lsm_early_cred(struct cred *cred);
|
| 354 | static void __init lsm_early_task(struct task_struct *task);
|
| 355 |
|
| 356 | static int lsm_append(const char *new, char **result);
|
| 357 |
|
| 358 | static void __init report_lsm_order(void)
|
| 359 | {
|
| 360 | struct lsm_info **lsm, *early;
|
| 361 | int first = 0;
|
| 362 |
|
| 363 | pr_info("initializing lsm=");
|
| 364 |
|
| 365 |
|
| 366 | for (early = __start_early_lsm_info;
|
| 367 | early < __end_early_lsm_info; early++)
|
| 368 | if (is_enabled(early))
|
| 369 | pr_cont("%s%s", first++ == 0 ? "" : ",", early->name);
|
| 370 | for (lsm = ordered_lsms; *lsm; lsm++)
|
| 371 | if (is_enabled(*lsm))
|
| 372 | pr_cont("%s%s", first++ == 0 ? "" : ",", (*lsm)->name);
|
| 373 |
|
| 374 | pr_cont("\n");
|
| 375 | }
|
| 376 |
|
| 377 | static void __init ordered_lsm_init(void)
|
| 378 | {
|
| 379 | struct lsm_info **lsm;
|
| 380 |
|
| 381 | ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms),
|
| 382 | GFP_KERNEL);
|
| 383 |
|
| 384 | if (chosen_lsm_order) {
|
| 385 | if (chosen_major_lsm) {
|
| 386 | pr_warn("security=%s is ignored because it is superseded by lsm=%s\n",
|
| 387 | chosen_major_lsm, chosen_lsm_order);
|
| 388 | chosen_major_lsm = NULL;
|
| 389 | }
|
| 390 | ordered_lsm_parse(chosen_lsm_order, "cmdline");
|
| 391 | } else
|
| 392 | ordered_lsm_parse(builtin_lsm_order, "builtin");
|
| 393 |
|
| 394 | for (lsm = ordered_lsms; *lsm; lsm++)
|
| 395 | prepare_lsm(*lsm);
|
| 396 |
|
| 397 | report_lsm_order();
|
| 398 |
|
| 399 | init_debug("cred blob size = %d\n", blob_sizes.lbs_cred);
|
| 400 | init_debug("file blob size = %d\n", blob_sizes.lbs_file);
|
| 401 | init_debug("inode blob size = %d\n", blob_sizes.lbs_inode);
|
| 402 | init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc);
|
| 403 | init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg);
|
| 404 | init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock);
|
| 405 | init_debug("task blob size = %d\n", blob_sizes.lbs_task);
|
| 406 | init_debug("xattr slots = %d\n", blob_sizes.lbs_xattr_count);
|
| 407 |
|
| 408 | |
| 409 | * Create any kmem_caches needed for blobs
|
| 410 |
|
| 411 | if (blob_sizes.lbs_file)
|
| 412 | lsm_file_cache = kmem_cache_create("lsm_file_cache",
|
| 413 | blob_sizes.lbs_file, 0,
|
| 414 | SLAB_PANIC, NULL);
|
| 415 | if (blob_sizes.lbs_inode)
|
| 416 | lsm_inode_cache = kmem_cache_create("lsm_inode_cache",
|
| 417 | blob_sizes.lbs_inode, 0,
|
| 418 | SLAB_PANIC, NULL);
|
| 419 |
|
| 420 | lsm_early_cred((struct cred *) current->cred);
|
| 421 | lsm_early_task(current);
|
| 422 | for (lsm = ordered_lsms; *lsm; lsm++)
|
| 423 | initialize_lsm(*lsm);
|
| 424 |
|
| 425 | kfree(ordered_lsms);
|
| 426 | }
|
| 427 |
|
| 428 | int __init early_security_init(void)
|
| 429 | {
|
| 430 | struct lsm_info *lsm;
|
| 431 |
|
| 432 | #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
|
| 433 | INIT_HLIST_HEAD(&security_hook_heads.NAME);
|
| 434 | #include "linux/lsm_hook_defs.h"
|
| 435 | #undef LSM_HOOK
|
| 436 |
|
| 437 | for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
|
| 438 | if (!lsm->enabled)
|
| 439 | lsm->enabled = &lsm_enabled_true;
|
| 440 | prepare_lsm(lsm);
|
| 441 | initialize_lsm(lsm);
|
| 442 | }
|
| 443 |
|
| 444 | return 0;
|
| 445 | }
|
| 446 |
|
| 447 | |
| 448 | * security_init - initializes the security framework
|
| 449 | *
|
| 450 | * This should be called early in the kernel initialization sequence.
|
| 451 |
|
| 452 | int __init security_init(void)
|
| 453 | {
|
| 454 | struct lsm_info *lsm;
|
| 455 |
|
| 456 | init_debug("legacy security=%s\n", chosen_major_lsm ? : " *unspecified*");
|
| 457 | init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order);
|
| 458 | init_debug("boot arg lsm=%s\n", chosen_lsm_order ? : " *unspecified*");
|
| 459 |
|
| 460 | |
| 461 | * Append the names of the early LSM modules now that kmalloc() is
|
| 462 | * available
|
| 463 |
|
| 464 | for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
|
| 465 | init_debug(" early started: %s (%s)\n", lsm->name,
|
| 466 | is_enabled(lsm) ? "enabled" : "disabled");
|
| 467 | if (lsm->enabled)
|
| 468 | lsm_append(lsm->name, &lsm_names);
|
| 469 | }
|
| 470 |
|
| 471 |
|
| 472 | ordered_lsm_init();
|
| 473 |
|
| 474 | return 0;
|
| 475 | }
|
| 476 |
|
| 477 |
|
| 478 | static int __init choose_major_lsm(char *str)
|
| 479 | {
|
| 480 | chosen_major_lsm = str;
|
| 481 | return 1;
|
| 482 | }
|
| 483 | __setup("security=", choose_major_lsm);
|
| 484 |
|
| 485 |
|
| 486 | static int __init choose_lsm_order(char *str)
|
| 487 | {
|
| 488 | chosen_lsm_order = str;
|
| 489 | return 1;
|
| 490 | }
|
| 491 | __setup("lsm=", choose_lsm_order);
|
| 492 |
|
| 493 |
|
| 494 | static int __init enable_debug(char *str)
|
| 495 | {
|
| 496 | debug = true;
|
| 497 | return 1;
|
| 498 | }
|
| 499 | __setup("lsm.debug", enable_debug);
|
| 500 |
|
| 501 | static bool match_last_lsm(const char *list, const char *lsm)
|
| 502 | {
|
| 503 | const char *last;
|
| 504 |
|
| 505 | if (WARN_ON(!list || !lsm))
|
| 506 | return false;
|
| 507 | last = strrchr(list, ',');
|
| 508 | if (last)
|
| 509 |
|
| 510 | last++;
|
| 511 | else
|
| 512 | last = list;
|
| 513 | return !strcmp(last, lsm);
|
| 514 | }
|
| 515 |
|
| 516 | static int lsm_append(const char *new, char **result)
|
| 517 | {
|
| 518 | char *cp;
|
| 519 |
|
| 520 | if (*result == NULL) {
|
| 521 | *result = kstrdup(new, GFP_KERNEL);
|
| 522 | if (*result == NULL)
|
| 523 | return -ENOMEM;
|
| 524 | } else {
|
| 525 |
|
| 526 | if (match_last_lsm(*result, new))
|
| 527 | return 0;
|
| 528 | cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
|
| 529 | if (cp == NULL)
|
| 530 | return -ENOMEM;
|
| 531 | kfree(*result);
|
| 532 | *result = cp;
|
| 533 | }
|
| 534 | return 0;
|
| 535 | }
|
| 536 |
|
| 537 | |
| 538 | * security_add_hooks - Add a modules hooks to the hook lists.
|
| 539 | * @hooks: the hooks to add
|
| 540 | * @count: the number of hooks to add
|
| 541 | * @lsmid: the identification information for the security module
|
| 542 | *
|
| 543 | * Each LSM has to register its hooks with the infrastructure.
|
| 544 |
|
| 545 | void __init security_add_hooks(struct security_hook_list *hooks, int count,
|
| 546 | const struct lsm_id *lsmid)
|
| 547 | {
|
| 548 | int i;
|
| 549 |
|
| 550 | |
| 551 | * A security module may call security_add_hooks() more
|
| 552 | * than once during initialization, and LSM initialization
|
| 553 | * is serialized. Landlock is one such case.
|
| 554 | * Look at the previous entry, if there is one, for duplication.
|
| 555 |
|
| 556 | if (lsm_active_cnt == 0 || lsm_idlist[lsm_active_cnt - 1] != lsmid) {
|
| 557 | if (lsm_active_cnt >= LSM_CONFIG_COUNT)
|
| 558 | panic("%s Too many LSMs registered.\n", __func__);
|
| 559 | lsm_idlist[lsm_active_cnt++] = lsmid;
|
| 560 | }
|
| 561 |
|
| 562 | for (i = 0; i < count; i++) {
|
| 563 | hooks[i].lsmid = lsmid;
|
| 564 | hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
|
| 565 | }
|
| 566 |
|
| 567 | |
| 568 | * Don't try to append during early_security_init(), we'll come back
|
| 569 | * and fix this up afterwards.
|
| 570 |
|
| 571 | if (slab_is_available()) {
|
| 572 | if (lsm_append(lsmid->name, &lsm_names) < 0)
|
| 573 | panic("%s - Cannot get early memory.\n", __func__);
|
| 574 | }
|
| 575 | }
|
| 576 |
|
| 577 | int call_blocking_lsm_notifier(enum lsm_event event, void *data)
|
| 578 | {
|
| 579 | return blocking_notifier_call_chain(&blocking_lsm_notifier_chain,
|
| 580 | event, data);
|
| 581 | }
|
| 582 | EXPORT_SYMBOL(call_blocking_lsm_notifier);
|
| 583 |
|
| 584 | int register_blocking_lsm_notifier(struct notifier_block *nb)
|
| 585 | {
|
| 586 | return blocking_notifier_chain_register(&blocking_lsm_notifier_chain,
|
| 587 | nb);
|
| 588 | }
|
| 589 | EXPORT_SYMBOL(register_blocking_lsm_notifier);
|
| 590 |
|
| 591 | int unregister_blocking_lsm_notifier(struct notifier_block *nb)
|
| 592 | {
|
| 593 | return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain,
|
| 594 | nb);
|
| 595 | }
|
| 596 | EXPORT_SYMBOL(unregister_blocking_lsm_notifier);
|
| 597 |
|
| 598 | |
| 599 | * lsm_cred_alloc - allocate a composite cred blob
|
| 600 | * @cred: the cred that needs a blob
|
| 601 | * @gfp: allocation type
|
| 602 | *
|
| 603 | * Allocate the cred blob for all the modules
|
| 604 | *
|
| 605 | * Returns 0, or -ENOMEM if memory can't be allocated.
|
| 606 |
|
| 607 | static int lsm_cred_alloc(struct cred *cred, gfp_t gfp)
|
| 608 | {
|
| 609 | if (blob_sizes.lbs_cred == 0) {
|
| 610 | cred->security = NULL;
|
| 611 | return 0;
|
| 612 | }
|
| 613 |
|
| 614 | cred->security = kzalloc(blob_sizes.lbs_cred, gfp);
|
| 615 | if (cred->security == NULL)
|
| 616 | return -ENOMEM;
|
| 617 | return 0;
|
| 618 | }
|
| 619 |
|
| 620 | |
| 621 | * lsm_early_cred - during initialization allocate a composite cred blob
|
| 622 | * @cred: the cred that needs a blob
|
| 623 | *
|
| 624 | * Allocate the cred blob for all the modules
|
| 625 |
|
| 626 | static void __init lsm_early_cred(struct cred *cred)
|
| 627 | {
|
| 628 | int rc = lsm_cred_alloc(cred, GFP_KERNEL);
|
| 629 |
|
| 630 | if (rc)
|
| 631 | panic("%s: Early cred alloc failed.\n", __func__);
|
| 632 | }
|
| 633 |
|
| 634 | |
| 635 | * lsm_file_alloc - allocate a composite file blob
|
| 636 | * @file: the file that needs a blob
|
| 637 | *
|
| 638 | * Allocate the file blob for all the modules
|
| 639 | *
|
| 640 | * Returns 0, or -ENOMEM if memory can't be allocated.
|
| 641 |
|
| 642 | static int lsm_file_alloc(struct file *file)
|
| 643 | {
|
| 644 | if (!lsm_file_cache) {
|
| 645 | file->f_security = NULL;
|
| 646 | return 0;
|
| 647 | }
|
| 648 |
|
| 649 | file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL);
|
| 650 | if (file->f_security == NULL)
|
| 651 | return -ENOMEM;
|
| 652 | return 0;
|
| 653 | }
|
| 654 |
|
| 655 | |
| 656 | * lsm_inode_alloc - allocate a composite inode blob
|
| 657 | * @inode: the inode that needs a blob
|
| 658 | *
|
| 659 | * Allocate the inode blob for all the modules
|
| 660 | *
|
| 661 | * Returns 0, or -ENOMEM if memory can't be allocated.
|
| 662 |
|
| 663 | int lsm_inode_alloc(struct inode *inode)
|
| 664 | {
|
| 665 | if (!lsm_inode_cache) {
|
| 666 | inode->i_security = NULL;
|
| 667 | return 0;
|
| 668 | }
|
| 669 |
|
| 670 | inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS);
|
| 671 | if (inode->i_security == NULL)
|
| 672 | return -ENOMEM;
|
| 673 | return 0;
|
| 674 | }
|
| 675 |
|
| 676 | |
| 677 | * lsm_task_alloc - allocate a composite task blob
|
| 678 | * @task: the task that needs a blob
|
| 679 | *
|
| 680 | * Allocate the task blob for all the modules
|
| 681 | *
|
| 682 | * Returns 0, or -ENOMEM if memory can't be allocated.
|
| 683 |
|
| 684 | static int lsm_task_alloc(struct task_struct *task)
|
| 685 | {
|
| 686 | if (blob_sizes.lbs_task == 0) {
|
| 687 | task->security = NULL;
|
| 688 | return 0;
|
| 689 | }
|
| 690 |
|
| 691 | task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
|
| 692 | if (task->security == NULL)
|
| 693 | return -ENOMEM;
|
| 694 | return 0;
|
| 695 | }
|
| 696 |
|
| 697 | |
| 698 | * lsm_ipc_alloc - allocate a composite ipc blob
|
| 699 | * @kip: the ipc that needs a blob
|
| 700 | *
|
| 701 | * Allocate the ipc blob for all the modules
|
| 702 | *
|
| 703 | * Returns 0, or -ENOMEM if memory can't be allocated.
|
| 704 |
|
| 705 | static int lsm_ipc_alloc(struct kern_ipc_perm *kip)
|
| 706 | {
|
| 707 | if (blob_sizes.lbs_ipc == 0) {
|
| 708 | kip->security = NULL;
|
| 709 | return 0;
|
| 710 | }
|
| 711 |
|
| 712 | kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL);
|
| 713 | if (kip->security == NULL)
|
| 714 | return -ENOMEM;
|
| 715 | return 0;
|
| 716 | }
|
| 717 |
|
| 718 | |
| 719 | * lsm_msg_msg_alloc - allocate a composite msg_msg blob
|
| 720 | * @mp: the msg_msg that needs a blob
|
| 721 | *
|
| 722 | * Allocate the ipc blob for all the modules
|
| 723 | *
|
| 724 | * Returns 0, or -ENOMEM if memory can't be allocated.
|
| 725 |
|
| 726 | static int lsm_msg_msg_alloc(struct msg_msg *mp)
|
| 727 | {
|
| 728 | if (blob_sizes.lbs_msg_msg == 0) {
|
| 729 | mp->security = NULL;
|
| 730 | return 0;
|
| 731 | }
|
| 732 |
|
| 733 | mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL);
|
| 734 | if (mp->security == NULL)
|
| 735 | return -ENOMEM;
|
| 736 | return 0;
|
| 737 | }
|
| 738 |
|
| 739 | |
| 740 | * lsm_early_task - during initialization allocate a composite task blob
|
| 741 | * @task: the task that needs a blob
|
| 742 | *
|
| 743 | * Allocate the task blob for all the modules
|
| 744 |
|
| 745 | static void __init lsm_early_task(struct task_struct *task)
|
| 746 | {
|
| 747 | int rc = lsm_task_alloc(task);
|
| 748 |
|
| 749 | if (rc)
|
| 750 | panic("%s: Early task alloc failed.\n", __func__);
|
| 751 | }
|
| 752 |
|
| 753 | |
| 754 | * lsm_superblock_alloc - allocate a composite superblock blob
|
| 755 | * @sb: the superblock that needs a blob
|
| 756 | *
|
| 757 | * Allocate the superblock blob for all the modules
|
| 758 | *
|
| 759 | * Returns 0, or -ENOMEM if memory can't be allocated.
|
| 760 |
|
| 761 | static int lsm_superblock_alloc(struct super_block *sb)
|
| 762 | {
|
| 763 | if (blob_sizes.lbs_superblock == 0) {
|
| 764 | sb->s_security = NULL;
|
| 765 | return 0;
|
| 766 | }
|
| 767 |
|
| 768 | sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL);
|
| 769 | if (sb->s_security == NULL)
|
| 770 | return -ENOMEM;
|
| 771 | return 0;
|
| 772 | }
|
| 773 |
|
| 774 | |
| 775 | * lsm_fill_user_ctx - Fill a user space lsm_ctx structure
|
| 776 | * @uctx: a userspace LSM context to be filled
|
| 777 | * @uctx_len: available uctx size (input), used uctx size (output)
|
| 778 | * @val: the new LSM context value
|
| 779 | * @val_len: the size of the new LSM context value
|
| 780 | * @id: LSM id
|
| 781 | * @flags: LSM defined flags
|
| 782 | *
|
| 783 | * Fill all of the fields in a userspace lsm_ctx structure.
|
| 784 | *
|
| 785 | * Returns 0 on success, -E2BIG if userspace buffer is not large enough,
|
| 786 | * -EFAULT on a copyout error, -ENOMEM if memory can't be allocated.
|
| 787 |
|
| 788 | int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, size_t *uctx_len,
|
| 789 | void *val, size_t val_len,
|
| 790 | u64 id, u64 flags)
|
| 791 | {
|
| 792 | struct lsm_ctx *nctx = NULL;
|
| 793 | size_t nctx_len;
|
| 794 | int rc = 0;
|
| 795 |
|
| 796 | nctx_len = ALIGN(struct_size(nctx, ctx, val_len), sizeof(void *));
|
| 797 | if (nctx_len > *uctx_len) {
|
| 798 | rc = -E2BIG;
|
| 799 | goto out;
|
| 800 | }
|
| 801 |
|
| 802 | nctx = kzalloc(nctx_len, GFP_KERNEL);
|
| 803 | if (nctx == NULL) {
|
| 804 | rc = -ENOMEM;
|
| 805 | goto out;
|
| 806 | }
|
| 807 | nctx->id = id;
|
| 808 | nctx->flags = flags;
|
| 809 | nctx->len = nctx_len;
|
| 810 | nctx->ctx_len = val_len;
|
| 811 | memcpy(nctx->ctx, val, val_len);
|
| 812 |
|
| 813 | if (copy_to_user(uctx, nctx, nctx_len))
|
| 814 | rc = -EFAULT;
|
| 815 |
|
| 816 | out:
|
| 817 | kfree(nctx);
|
| 818 | *uctx_len = nctx_len;
|
| 819 | return rc;
|
| 820 | }
|
| 821 |
|
| 822 | |
| 823 | * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
|
| 824 | * can be accessed with:
|
| 825 | *
|
| 826 | * LSM_RET_DEFAULT(<hook_name>)
|
| 827 | *
|
| 828 | * The macros below define static constants for the default value of each
|
| 829 | * LSM hook.
|
| 830 |
|
| 831 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
|
| 832 | #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
|
| 833 | #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
|
| 834 | static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT);
|
| 835 | #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
|
| 836 | DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
|
| 837 |
|
| 838 | #include <linux/lsm_hook_defs.h>
|
| 839 | #undef LSM_HOOK
|
| 840 |
|
| 841 | |
| 842 | * Hook list operation macros.
|
| 843 | *
|
| 844 | * call_void_hook:
|
| 845 | * This is a hook that does not return a value.
|
| 846 | *
|
| 847 | * call_int_hook:
|
| 848 | * This is a hook that returns a value.
|
| 849 |
|
| 850 |
|
| 851 | #define call_void_hook(FUNC, ...) \
|
| 852 | do { \
|
| 853 | struct security_hook_list *P; \
|
| 854 | \
|
| 855 | hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
|
| 856 | P->hook.FUNC(__VA_ARGS__); \
|
| 857 | } while (0)
|
| 858 |
|
| 859 | #define call_int_hook(FUNC, IRC, ...) ({ \
|
| 860 | int RC = IRC; \
|
| 861 | do { \
|
| 862 | struct security_hook_list *P; \
|
| 863 | \
|
| 864 | hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
|
| 865 | RC = P->hook.FUNC(__VA_ARGS__); \
|
| 866 | if (RC != 0) \
|
| 867 | break; \
|
| 868 | } \
|
| 869 | } while (0); \
|
| 870 | RC; \
|
| 871 | })
|
| 872 |
|
| 873 |
|
| 874 |
|
| 875 | |
| 876 | * security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok
|
| 877 | * @mgr: task credentials of current binder process
|
| 878 | *
|
| 879 | * Check whether @mgr is allowed to be the binder context manager.
|
| 880 | *
|
| 881 | * Return: Return 0 if permission is granted.
|
| 882 |
|
| 883 | int security_binder_set_context_mgr(const struct cred *mgr)
|
| 884 | {
|
| 885 | return call_int_hook(binder_set_context_mgr, 0, mgr);
|
| 886 | }
|
| 887 |
|
| 888 | |
| 889 | * security_binder_transaction() - Check if a binder transaction is allowed
|
| 890 | * @from: sending process
|
| 891 | * @to: receiving process
|
| 892 | *
|
| 893 | * Check whether @from is allowed to invoke a binder transaction call to @to.
|
| 894 | *
|
| 895 | * Return: Returns 0 if permission is granted.
|
| 896 |
|
| 897 | int security_binder_transaction(const struct cred *from,
|
| 898 | const struct cred *to)
|
| 899 | {
|
| 900 | return call_int_hook(binder_transaction, 0, from, to);
|
| 901 | }
|
| 902 |
|
| 903 | |
| 904 | * security_binder_transfer_binder() - Check if a binder transfer is allowed
|
| 905 | * @from: sending process
|
| 906 | * @to: receiving process
|
| 907 | *
|
| 908 | * Check whether @from is allowed to transfer a binder reference to @to.
|
| 909 | *
|
| 910 | * Return: Returns 0 if permission is granted.
|
| 911 |
|
| 912 | int security_binder_transfer_binder(const struct cred *from,
|
| 913 | const struct cred *to)
|
| 914 | {
|
| 915 | return call_int_hook(binder_transfer_binder, 0, from, to);
|
| 916 | }
|
| 917 |
|
| 918 | |
| 919 | * security_binder_transfer_file() - Check if a binder file xfer is allowed
|
| 920 | * @from: sending process
|
| 921 | * @to: receiving process
|
| 922 | * @file: file being transferred
|
| 923 | *
|
| 924 | * Check whether @from is allowed to transfer @file to @to.
|
| 925 | *
|
| 926 | * Return: Returns 0 if permission is granted.
|
| 927 |
|
| 928 | int security_binder_transfer_file(const struct cred *from,
|
| 929 | const struct cred *to, const struct file *file)
|
| 930 | {
|
| 931 | return call_int_hook(binder_transfer_file, 0, from, to, file);
|
| 932 | }
|
| 933 |
|
| 934 | |
| 935 | * security_ptrace_access_check() - Check if tracing is allowed
|
| 936 | * @child: target process
|
| 937 | * @mode: PTRACE_MODE flags
|
| 938 | *
|
| 939 | * Check permission before allowing the current process to trace the @child
|
| 940 | * process. Security modules may also want to perform a process tracing check
|
| 941 | * during an execve in the set_security or apply_creds hooks of tracing check
|
| 942 | * during an execve in the bprm_set_creds hook of binprm_security_ops if the
|
| 943 | * process is being traced and its security attributes would be changed by the
|
| 944 | * execve.
|
| 945 | *
|
| 946 | * Return: Returns 0 if permission is granted.
|
| 947 |
|
| 948 | int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
|
| 949 | {
|
| 950 | return call_int_hook(ptrace_access_check, 0, child, mode);
|
| 951 | }
|
| 952 |
|
| 953 | |
| 954 | * security_ptrace_traceme() - Check if tracing is allowed
|
| 955 | * @parent: tracing process
|
| 956 | *
|
| 957 | * Check that the @parent process has sufficient permission to trace the
|
| 958 | * current process before allowing the current process to present itself to the
|
| 959 | * @parent process for tracing.
|
| 960 | *
|
| 961 | * Return: Returns 0 if permission is granted.
|
| 962 |
|
| 963 | int security_ptrace_traceme(struct task_struct *parent)
|
| 964 | {
|
| 965 | return call_int_hook(ptrace_traceme, 0, parent);
|
| 966 | }
|
| 967 |
|
| 968 | |
| 969 | * security_capget() - Get the capability sets for a process
|
| 970 | * @target: target process
|
| 971 | * @effective: effective capability set
|
| 972 | * @inheritable: inheritable capability set
|
| 973 | * @permitted: permitted capability set
|
| 974 | *
|
| 975 | * Get the @effective, @inheritable, and @permitted capability sets for the
|
| 976 | * @target process. The hook may also perform permission checking to determine
|
| 977 | * if the current process is allowed to see the capability sets of the @target
|
| 978 | * process.
|
| 979 | *
|
| 980 | * Return: Returns 0 if the capability sets were successfully obtained.
|
| 981 |
|
| 982 | int security_capget(const struct task_struct *target,
|
| 983 | kernel_cap_t *effective,
|
| 984 | kernel_cap_t *inheritable,
|
| 985 | kernel_cap_t *permitted)
|
| 986 | {
|
| 987 | return call_int_hook(capget, 0, target,
|
| 988 | effective, inheritable, permitted);
|
| 989 | }
|
| 990 |
|
| 991 | |
| 992 | * security_capset() - Set the capability sets for a process
|
| 993 | * @new: new credentials for the target process
|
| 994 | * @old: current credentials of the target process
|
| 995 | * @effective: effective capability set
|
| 996 | * @inheritable: inheritable capability set
|
| 997 | * @permitted: permitted capability set
|
| 998 | *
|
| 999 | * Set the @effective, @inheritable, and @permitted capability sets for the
|
| 1000 | * current process.
|
| 1001 | *
|
| 1002 | * Return: Returns 0 and update @new if permission is granted.
|
| 1003 |
|
| 1004 | int security_capset(struct cred *new, const struct cred *old,
|
| 1005 | const kernel_cap_t *effective,
|
| 1006 | const kernel_cap_t *inheritable,
|
| 1007 | const kernel_cap_t *permitted)
|
| 1008 | {
|
| 1009 | return call_int_hook(capset, 0, new, old,
|
| 1010 | effective, inheritable, permitted);
|
| 1011 | }
|
| 1012 |
|
| 1013 | |
| 1014 | * security_capable() - Check if a process has the necessary capability
|
| 1015 | * @cred: credentials to examine
|
| 1016 | * @ns: user namespace
|
| 1017 | * @cap: capability requested
|
| 1018 | * @opts: capability check options
|
| 1019 | *
|
| 1020 | * Check whether the @tsk process has the @cap capability in the indicated
|
| 1021 | * credentials. @cap contains the capability <include/linux/capability.h>.
|
| 1022 | * @opts contains options for the capable check <include/linux/security.h>.
|
| 1023 | *
|
| 1024 | * Return: Returns 0 if the capability is granted.
|
| 1025 |
|
| 1026 | int security_capable(const struct cred *cred,
|
| 1027 | struct user_namespace *ns,
|
| 1028 | int cap,
|
| 1029 | unsigned int opts)
|
| 1030 | {
|
| 1031 | return call_int_hook(capable, 0, cred, ns, cap, opts);
|
| 1032 | }
|
| 1033 |
|
| 1034 | |
| 1035 | * security_quotactl() - Check if a quotactl() syscall is allowed for this fs
|
| 1036 | * @cmds: commands
|
| 1037 | * @type: type
|
| 1038 | * @id: id
|
| 1039 | * @sb: filesystem
|
| 1040 | *
|
| 1041 | * Check whether the quotactl syscall is allowed for this @sb.
|
| 1042 | *
|
| 1043 | * Return: Returns 0 if permission is granted.
|
| 1044 |
|
| 1045 | int security_quotactl(int cmds, int type, int id, const struct super_block *sb)
|
| 1046 | {
|
| 1047 | return call_int_hook(quotactl, 0, cmds, type, id, sb);
|
| 1048 | }
|
| 1049 |
|
| 1050 | |
| 1051 | * security_quota_on() - Check if QUOTAON is allowed for a dentry
|
| 1052 | * @dentry: dentry
|
| 1053 | *
|
| 1054 | * Check whether QUOTAON is allowed for @dentry.
|
| 1055 | *
|
| 1056 | * Return: Returns 0 if permission is granted.
|
| 1057 |
|
| 1058 | int security_quota_on(struct dentry *dentry)
|
| 1059 | {
|
| 1060 | return call_int_hook(quota_on, 0, dentry);
|
| 1061 | }
|
| 1062 |
|
| 1063 | |
| 1064 | * security_syslog() - Check if accessing the kernel message ring is allowed
|
| 1065 | * @type: SYSLOG_ACTION_* type
|
| 1066 | *
|
| 1067 | * Check permission before accessing the kernel message ring or changing
|
| 1068 | * logging to the console. See the syslog(2) manual page for an explanation of
|
| 1069 | * the @type values.
|
| 1070 | *
|
| 1071 | * Return: Return 0 if permission is granted.
|
| 1072 |
|
| 1073 | int security_syslog(int type)
|
| 1074 | {
|
| 1075 | return call_int_hook(syslog, 0, type);
|
| 1076 | }
|
| 1077 |
|
| 1078 | |
| 1079 | * security_settime64() - Check if changing the system time is allowed
|
| 1080 | * @ts: new time
|
| 1081 | * @tz: timezone
|
| 1082 | *
|
| 1083 | * Check permission to change the system time, struct timespec64 is defined in
|
| 1084 | * <include/linux/time64.h> and timezone is defined in <include/linux/time.h>.
|
| 1085 | *
|
| 1086 | * Return: Returns 0 if permission is granted.
|
| 1087 |
|
| 1088 | int security_settime64(const struct timespec64 *ts, const struct timezone *tz)
|
| 1089 | {
|
| 1090 | return call_int_hook(settime, 0, ts, tz);
|
| 1091 | }
|
| 1092 |
|
| 1093 | |
| 1094 | * security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed
|
| 1095 | * @mm: mm struct
|
| 1096 | * @pages: number of pages
|
| 1097 | *
|
| 1098 | * Check permissions for allocating a new virtual mapping. If all LSMs return
|
| 1099 | * a positive value, __vm_enough_memory() will be called with cap_sys_admin
|
| 1100 | * set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be
|
| 1101 | * called with cap_sys_admin cleared.
|
| 1102 | *
|
| 1103 | * Return: Returns 0 if permission is granted by the LSM infrastructure to the
|
| 1104 | * caller.
|
| 1105 |
|
| 1106 | int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
|
| 1107 | {
|
| 1108 | struct security_hook_list *hp;
|
| 1109 | int cap_sys_admin = 1;
|
| 1110 | int rc;
|
| 1111 |
|
| 1112 | |
| 1113 | * The module will respond with a positive value if
|
| 1114 | * it thinks the __vm_enough_memory() call should be
|
| 1115 | * made with the cap_sys_admin set. If all of the modules
|
| 1116 | * agree that it should be set it will. If any module
|
| 1117 | * thinks it should not be set it won't.
|
| 1118 |
|
| 1119 | hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
|
| 1120 | rc = hp->hook.vm_enough_memory(mm, pages);
|
| 1121 | if (rc <= 0) {
|
| 1122 | cap_sys_admin = 0;
|
| 1123 | break;
|
| 1124 | }
|
| 1125 | }
|
| 1126 | return __vm_enough_memory(mm, pages, cap_sys_admin);
|
| 1127 | }
|
| 1128 |
|
| 1129 | |
| 1130 | * security_bprm_creds_for_exec() - Prepare the credentials for exec()
|
| 1131 | * @bprm: binary program information
|
| 1132 | *
|
| 1133 | * If the setup in prepare_exec_creds did not setup @bprm->cred->security
|
| 1134 | * properly for executing @bprm->file, update the LSM's portion of
|
| 1135 | * @bprm->cred->security to be what commit_creds needs to install for the new
|
| 1136 | * program. This hook may also optionally check permissions (e.g. for
|
| 1137 | * transitions between security domains). The hook must set @bprm->secureexec
|
| 1138 | * to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm
|
| 1139 | * contains the linux_binprm structure.
|
| 1140 | *
|
| 1141 | * Return: Returns 0 if the hook is successful and permission is granted.
|
| 1142 |
|
| 1143 | int security_bprm_creds_for_exec(struct linux_binprm *bprm)
|
| 1144 | {
|
| 1145 | return call_int_hook(bprm_creds_for_exec, 0, bprm);
|
| 1146 | }
|
| 1147 |
|
| 1148 | |
| 1149 | * security_bprm_creds_from_file() - Update linux_binprm creds based on file
|
| 1150 | * @bprm: binary program information
|
| 1151 | * @file: associated file
|
| 1152 | *
|
| 1153 | * If @file is setpcap, suid, sgid or otherwise marked to change privilege upon
|
| 1154 | * exec, update @bprm->cred to reflect that change. This is called after
|
| 1155 | * finding the binary that will be executed without an interpreter. This
|
| 1156 | * ensures that the credentials will not be derived from a script that the
|
| 1157 | * binary will need to reopen, which when reopend may end up being a completely
|
| 1158 | * different file. This hook may also optionally check permissions (e.g. for
|
| 1159 | * transitions between security domains). The hook must set @bprm->secureexec
|
| 1160 | * to 1 if AT_SECURE should be set to request libc enable secure mode. The
|
| 1161 | * hook must add to @bprm->per_clear any personality flags that should be
|
| 1162 | * cleared from current->personality. @bprm contains the linux_binprm
|
| 1163 | * structure.
|
| 1164 | *
|
| 1165 | * Return: Returns 0 if the hook is successful and permission is granted.
|
| 1166 |
|
| 1167 | int security_bprm_creds_from_file(struct linux_binprm *bprm, const struct file *file)
|
| 1168 | {
|
| 1169 | return call_int_hook(bprm_creds_from_file, 0, bprm, file);
|
| 1170 | }
|
| 1171 |
|
| 1172 | |
| 1173 | * security_bprm_check() - Mediate binary handler search
|
| 1174 | * @bprm: binary program information
|
| 1175 | *
|
| 1176 | * This hook mediates the point when a search for a binary handler will begin.
|
| 1177 | * It allows a check against the @bprm->cred->security value which was set in
|
| 1178 | * the preceding creds_for_exec call. The argv list and envp list are reliably
|
| 1179 | * available in @bprm. This hook may be called multiple times during a single
|
| 1180 | * execve. @bprm contains the linux_binprm structure.
|
| 1181 | *
|
| 1182 | * Return: Returns 0 if the hook is successful and permission is granted.
|
| 1183 |
|
| 1184 | int security_bprm_check(struct linux_binprm *bprm)
|
| 1185 | {
|
| 1186 | int ret;
|
| 1187 |
|
| 1188 | ret = call_int_hook(bprm_check_security, 0, bprm);
|
| 1189 | if (ret)
|
| 1190 | return ret;
|
| 1191 | return ima_bprm_check(bprm);
|
| 1192 | }
|
| 1193 |
|
| 1194 | |
| 1195 | * security_bprm_committing_creds() - Install creds for a process during exec()
|
| 1196 | * @bprm: binary program information
|
| 1197 | *
|
| 1198 | * Prepare to install the new security attributes of a process being
|
| 1199 | * transformed by an execve operation, based on the old credentials pointed to
|
| 1200 | * by @current->cred and the information set in @bprm->cred by the
|
| 1201 | * bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This
|
| 1202 | * hook is a good place to perform state changes on the process such as closing
|
| 1203 | * open file descriptors to which access will no longer be granted when the
|
| 1204 | * attributes are changed. This is called immediately before commit_creds().
|
| 1205 |
|
| 1206 | void security_bprm_committing_creds(const struct linux_binprm *bprm)
|
| 1207 | {
|
| 1208 | call_void_hook(bprm_committing_creds, bprm);
|
| 1209 | }
|
| 1210 |
|
| 1211 | |
| 1212 | * security_bprm_committed_creds() - Tidy up after cred install during exec()
|
| 1213 | * @bprm: binary program information
|
| 1214 | *
|
| 1215 | * Tidy up after the installation of the new security attributes of a process
|
| 1216 | * being transformed by an execve operation. The new credentials have, by this
|
| 1217 | * point, been set to @current->cred. @bprm points to the linux_binprm
|
| 1218 | * structure. This hook is a good place to perform state changes on the
|
| 1219 | * process such as clearing out non-inheritable signal state. This is called
|
| 1220 | * immediately after commit_creds().
|
| 1221 |
|
| 1222 | void security_bprm_committed_creds(const struct linux_binprm *bprm)
|
| 1223 | {
|
| 1224 | call_void_hook(bprm_committed_creds, bprm);
|
| 1225 | }
|
| 1226 |
|
| 1227 | |
| 1228 | * security_fs_context_submount() - Initialise fc->security
|
| 1229 | * @fc: new filesystem context
|
| 1230 | * @reference: dentry reference for submount/remount
|
| 1231 | *
|
| 1232 | * Fill out the ->security field for a new fs_context.
|
| 1233 | *
|
| 1234 | * Return: Returns 0 on success or negative error code on failure.
|
| 1235 |
|
| 1236 | int security_fs_context_submount(struct fs_context *fc, struct super_block *reference)
|
| 1237 | {
|
| 1238 | return call_int_hook(fs_context_submount, 0, fc, reference);
|
| 1239 | }
|
| 1240 |
|
| 1241 | |
| 1242 | * security_fs_context_dup() - Duplicate a fs_context LSM blob
|
| 1243 | * @fc: destination filesystem context
|
| 1244 | * @src_fc: source filesystem context
|
| 1245 | *
|
| 1246 | * Allocate and attach a security structure to sc->security. This pointer is
|
| 1247 | * initialised to NULL by the caller. @fc indicates the new filesystem context.
|
| 1248 | * @src_fc indicates the original filesystem context.
|
| 1249 | *
|
| 1250 | * Return: Returns 0 on success or a negative error code on failure.
|
| 1251 |
|
| 1252 | int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
|
| 1253 | {
|
| 1254 | return call_int_hook(fs_context_dup, 0, fc, src_fc);
|
| 1255 | }
|
| 1256 |
|
| 1257 | |
| 1258 | * security_fs_context_parse_param() - Configure a filesystem context
|
| 1259 | * @fc: filesystem context
|
| 1260 | * @param: filesystem parameter
|
| 1261 | *
|
| 1262 | * Userspace provided a parameter to configure a superblock. The LSM can
|
| 1263 | * consume the parameter or return it to the caller for use elsewhere.
|
| 1264 | *
|
| 1265 | * Return: If the parameter is used by the LSM it should return 0, if it is
|
| 1266 | * returned to the caller -ENOPARAM is returned, otherwise a negative
|
| 1267 | * error code is returned.
|
| 1268 |
|
| 1269 | int security_fs_context_parse_param(struct fs_context *fc,
|
| 1270 | struct fs_parameter *param)
|
| 1271 | {
|
| 1272 | struct security_hook_list *hp;
|
| 1273 | int trc;
|
| 1274 | int rc = -ENOPARAM;
|
| 1275 |
|
| 1276 | hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param,
|
| 1277 | list) {
|
| 1278 | trc = hp->hook.fs_context_parse_param(fc, param);
|
| 1279 | if (trc == 0)
|
| 1280 | rc = 0;
|
| 1281 | else if (trc != -ENOPARAM)
|
| 1282 | return trc;
|
| 1283 | }
|
| 1284 | return rc;
|
| 1285 | }
|
| 1286 |
|
| 1287 | |
| 1288 | * security_sb_alloc() - Allocate a super_block LSM blob
|
| 1289 | * @sb: filesystem superblock
|
| 1290 | *
|
| 1291 | * Allocate and attach a security structure to the sb->s_security field. The
|
| 1292 | * s_security field is initialized to NULL when the structure is allocated.
|
| 1293 | * @sb contains the super_block structure to be modified.
|
| 1294 | *
|
| 1295 | * Return: Returns 0 if operation was successful.
|
| 1296 |
|
| 1297 | int security_sb_alloc(struct super_block *sb)
|
| 1298 | {
|
| 1299 | int rc = lsm_superblock_alloc(sb);
|
| 1300 |
|
| 1301 | if (unlikely(rc))
|
| 1302 | return rc;
|
| 1303 | rc = call_int_hook(sb_alloc_security, 0, sb);
|
| 1304 | if (unlikely(rc))
|
| 1305 | security_sb_free(sb);
|
| 1306 | return rc;
|
| 1307 | }
|
| 1308 |
|
| 1309 | |
| 1310 | * security_sb_delete() - Release super_block LSM associated objects
|
| 1311 | * @sb: filesystem superblock
|
| 1312 | *
|
| 1313 | * Release objects tied to a superblock (e.g. inodes). @sb contains the
|
| 1314 | * super_block structure being released.
|
| 1315 |
|
| 1316 | void security_sb_delete(struct super_block *sb)
|
| 1317 | {
|
| 1318 | call_void_hook(sb_delete, sb);
|
| 1319 | }
|
| 1320 |
|
| 1321 | |
| 1322 | * security_sb_free() - Free a super_block LSM blob
|
| 1323 | * @sb: filesystem superblock
|
| 1324 | *
|
| 1325 | * Deallocate and clear the sb->s_security field. @sb contains the super_block
|
| 1326 | * structure to be modified.
|
| 1327 |
|
| 1328 | void security_sb_free(struct super_block *sb)
|
| 1329 | {
|
| 1330 | call_void_hook(sb_free_security, sb);
|
| 1331 | kfree(sb->s_security);
|
| 1332 | sb->s_security = NULL;
|
| 1333 | }
|
| 1334 |
|
| 1335 | |
| 1336 | * security_free_mnt_opts() - Free memory associated with mount options
|
| 1337 | * @mnt_opts: LSM processed mount options
|
| 1338 | *
|
| 1339 | * Free memory associated with @mnt_ops.
|
| 1340 |
|
| 1341 | void security_free_mnt_opts(void **mnt_opts)
|
| 1342 | {
|
| 1343 | if (!*mnt_opts)
|
| 1344 | return;
|
| 1345 | call_void_hook(sb_free_mnt_opts, *mnt_opts);
|
| 1346 | *mnt_opts = NULL;
|
| 1347 | }
|
| 1348 | EXPORT_SYMBOL(security_free_mnt_opts);
|
| 1349 |
|
| 1350 | |
| 1351 | * security_sb_eat_lsm_opts() - Consume LSM mount options
|
| 1352 | * @options: mount options
|
| 1353 | * @mnt_opts: LSM processed mount options
|
| 1354 | *
|
| 1355 | * Eat (scan @options) and save them in @mnt_opts.
|
| 1356 | *
|
| 1357 | * Return: Returns 0 on success, negative values on failure.
|
| 1358 |
|
| 1359 | int security_sb_eat_lsm_opts(char *options, void **mnt_opts)
|
| 1360 | {
|
| 1361 | return call_int_hook(sb_eat_lsm_opts, 0, options, mnt_opts);
|
| 1362 | }
|
| 1363 | EXPORT_SYMBOL(security_sb_eat_lsm_opts);
|
| 1364 |
|
| 1365 | |
| 1366 | * security_sb_mnt_opts_compat() - Check if new mount options are allowed
|
| 1367 | * @sb: filesystem superblock
|
| 1368 | * @mnt_opts: new mount options
|
| 1369 | *
|
| 1370 | * Determine if the new mount options in @mnt_opts are allowed given the
|
| 1371 | * existing mounted filesystem at @sb. @sb superblock being compared.
|
| 1372 | *
|
| 1373 | * Return: Returns 0 if options are compatible.
|
| 1374 |
|
| 1375 | int security_sb_mnt_opts_compat(struct super_block *sb,
|
| 1376 | void *mnt_opts)
|
| 1377 | {
|
| 1378 | return call_int_hook(sb_mnt_opts_compat, 0, sb, mnt_opts);
|
| 1379 | }
|
| 1380 | EXPORT_SYMBOL(security_sb_mnt_opts_compat);
|
| 1381 |
|
| 1382 | |
| 1383 | * security_sb_remount() - Verify no incompatible mount changes during remount
|
| 1384 | * @sb: filesystem superblock
|
| 1385 | * @mnt_opts: (re)mount options
|
| 1386 | *
|
| 1387 | * Extracts security system specific mount options and verifies no changes are
|
| 1388 | * being made to those options.
|
| 1389 | *
|
| 1390 | * Return: Returns 0 if permission is granted.
|
| 1391 |
|
| 1392 | int security_sb_remount(struct super_block *sb,
|
| 1393 | void *mnt_opts)
|
| 1394 | {
|
| 1395 | return call_int_hook(sb_remount, 0, sb, mnt_opts);
|
| 1396 | }
|
| 1397 | EXPORT_SYMBOL(security_sb_remount);
|
| 1398 |
|
| 1399 | |
| 1400 | * security_sb_kern_mount() - Check if a kernel mount is allowed
|
| 1401 | * @sb: filesystem superblock
|
| 1402 | *
|
| 1403 | * Mount this @sb if allowed by permissions.
|
| 1404 | *
|
| 1405 | * Return: Returns 0 if permission is granted.
|
| 1406 |
|
| 1407 | int security_sb_kern_mount(const struct super_block *sb)
|
| 1408 | {
|
| 1409 | return call_int_hook(sb_kern_mount, 0, sb);
|
| 1410 | }
|
| 1411 |
|
| 1412 | |
| 1413 | * security_sb_show_options() - Output the mount options for a superblock
|
| 1414 | * @m: output file
|
| 1415 | * @sb: filesystem superblock
|
| 1416 | *
|
| 1417 | * Show (print on @m) mount options for this @sb.
|
| 1418 | *
|
| 1419 | * Return: Returns 0 on success, negative values on failure.
|
| 1420 |
|
| 1421 | int security_sb_show_options(struct seq_file *m, struct super_block *sb)
|
| 1422 | {
|
| 1423 | return call_int_hook(sb_show_options, 0, m, sb);
|
| 1424 | }
|
| 1425 |
|
| 1426 | |
| 1427 | * security_sb_statfs() - Check if accessing fs stats is allowed
|
| 1428 | * @dentry: superblock handle
|
| 1429 | *
|
| 1430 | * Check permission before obtaining filesystem statistics for the @mnt
|
| 1431 | * mountpoint. @dentry is a handle on the superblock for the filesystem.
|
| 1432 | *
|
| 1433 | * Return: Returns 0 if permission is granted.
|
| 1434 |
|
| 1435 | int security_sb_statfs(struct dentry *dentry)
|
| 1436 | {
|
| 1437 | return call_int_hook(sb_statfs, 0, dentry);
|
| 1438 | }
|
| 1439 |
|
| 1440 | |
| 1441 | * security_sb_mount() - Check permission for mounting a filesystem
|
| 1442 | * @dev_name: filesystem backing device
|
| 1443 | * @path: mount point
|
| 1444 | * @type: filesystem type
|
| 1445 | * @flags: mount flags
|
| 1446 | * @data: filesystem specific data
|
| 1447 | *
|
| 1448 | * Check permission before an object specified by @dev_name is mounted on the
|
| 1449 | * mount point named by @nd. For an ordinary mount, @dev_name identifies a
|
| 1450 | * device if the file system type requires a device. For a remount
|
| 1451 | * (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
|
| 1452 | * (@flags & MS_BIND), @dev_name identifies the pathname of the object being
|
| 1453 | * mounted.
|
| 1454 | *
|
| 1455 | * Return: Returns 0 if permission is granted.
|
| 1456 |
|
| 1457 | int security_sb_mount(const char *dev_name, const struct path *path,
|
| 1458 | const char *type, unsigned long flags, void *data)
|
| 1459 | {
|
| 1460 | return call_int_hook(sb_mount, 0, dev_name, path, type, flags, data);
|
| 1461 | }
|
| 1462 |
|
| 1463 | |
| 1464 | * security_sb_umount() - Check permission for unmounting a filesystem
|
| 1465 | * @mnt: mounted filesystem
|
| 1466 | * @flags: unmount flags
|
| 1467 | *
|
| 1468 | * Check permission before the @mnt file system is unmounted.
|
| 1469 | *
|
| 1470 | * Return: Returns 0 if permission is granted.
|
| 1471 |
|
| 1472 | int security_sb_umount(struct vfsmount *mnt, int flags)
|
| 1473 | {
|
| 1474 | return call_int_hook(sb_umount, 0, mnt, flags);
|
| 1475 | }
|
| 1476 |
|
| 1477 | |
| 1478 | * security_sb_pivotroot() - Check permissions for pivoting the rootfs
|
| 1479 | * @old_path: new location for current rootfs
|
| 1480 | * @new_path: location of the new rootfs
|
| 1481 | *
|
| 1482 | * Check permission before pivoting the root filesystem.
|
| 1483 | *
|
| 1484 | * Return: Returns 0 if permission is granted.
|
| 1485 |
|
| 1486 | int security_sb_pivotroot(const struct path *old_path,
|
| 1487 | const struct path *new_path)
|
| 1488 | {
|
| 1489 | return call_int_hook(sb_pivotroot, 0, old_path, new_path);
|
| 1490 | }
|
| 1491 |
|
| 1492 | |
| 1493 | * security_sb_set_mnt_opts() - Set the mount options for a filesystem
|
| 1494 | * @sb: filesystem superblock
|
| 1495 | * @mnt_opts: binary mount options
|
| 1496 | * @kern_flags: kernel flags (in)
|
| 1497 | * @set_kern_flags: kernel flags (out)
|
| 1498 | *
|
| 1499 | * Set the security relevant mount options used for a superblock.
|
| 1500 | *
|
| 1501 | * Return: Returns 0 on success, error on failure.
|
| 1502 |
|
| 1503 | int security_sb_set_mnt_opts(struct super_block *sb,
|
| 1504 | void *mnt_opts,
|
| 1505 | unsigned long kern_flags,
|
| 1506 | unsigned long *set_kern_flags)
|
| 1507 | {
|
| 1508 | return call_int_hook(sb_set_mnt_opts,
|
| 1509 | mnt_opts ? -EOPNOTSUPP : 0, sb,
|
| 1510 | mnt_opts, kern_flags, set_kern_flags);
|
| 1511 | }
|
| 1512 | EXPORT_SYMBOL(security_sb_set_mnt_opts);
|
| 1513 |
|
| 1514 | |
| 1515 | * security_sb_clone_mnt_opts() - Duplicate superblock mount options
|
| 1516 | * @oldsb: source superblock
|
| 1517 | * @newsb: destination superblock
|
| 1518 | * @kern_flags: kernel flags (in)
|
| 1519 | * @set_kern_flags: kernel flags (out)
|
| 1520 | *
|
| 1521 | * Copy all security options from a given superblock to another.
|
| 1522 | *
|
| 1523 | * Return: Returns 0 on success, error on failure.
|
| 1524 |
|
| 1525 | int security_sb_clone_mnt_opts(const struct super_block *oldsb,
|
| 1526 | struct super_block *newsb,
|
| 1527 | unsigned long kern_flags,
|
| 1528 | unsigned long *set_kern_flags)
|
| 1529 | {
|
| 1530 | return call_int_hook(sb_clone_mnt_opts, 0, oldsb, newsb,
|
| 1531 | kern_flags, set_kern_flags);
|
| 1532 | }
|
| 1533 | EXPORT_SYMBOL(security_sb_clone_mnt_opts);
|
| 1534 |
|
| 1535 | |
| 1536 | * security_move_mount() - Check permissions for moving a mount
|
| 1537 | * @from_path: source mount point
|
| 1538 | * @to_path: destination mount point
|
| 1539 | *
|
| 1540 | * Check permission before a mount is moved.
|
| 1541 | *
|
| 1542 | * Return: Returns 0 if permission is granted.
|
| 1543 |
|
| 1544 | int security_move_mount(const struct path *from_path,
|
| 1545 | const struct path *to_path)
|
| 1546 | {
|
| 1547 | return call_int_hook(move_mount, 0, from_path, to_path);
|
| 1548 | }
|
| 1549 |
|
| 1550 | |
| 1551 | * security_path_notify() - Check if setting a watch is allowed
|
| 1552 | * @path: file path
|
| 1553 | * @mask: event mask
|
| 1554 | * @obj_type: file path type
|
| 1555 | *
|
| 1556 | * Check permissions before setting a watch on events as defined by @mask, on
|
| 1557 | * an object at @path, whose type is defined by @obj_type.
|
| 1558 | *
|
| 1559 | * Return: Returns 0 if permission is granted.
|
| 1560 |
|
| 1561 | int security_path_notify(const struct path *path, u64 mask,
|
| 1562 | unsigned int obj_type)
|
| 1563 | {
|
| 1564 | return call_int_hook(path_notify, 0, path, mask, obj_type);
|
| 1565 | }
|
| 1566 |
|
| 1567 | |
| 1568 | * security_inode_alloc() - Allocate an inode LSM blob
|
| 1569 | * @inode: the inode
|
| 1570 | *
|
| 1571 | * Allocate and attach a security structure to @inode->i_security. The
|
| 1572 | * i_security field is initialized to NULL when the inode structure is
|
| 1573 | * allocated.
|
| 1574 | *
|
| 1575 | * Return: Return 0 if operation was successful.
|
| 1576 |
|
| 1577 | int security_inode_alloc(struct inode *inode)
|
| 1578 | {
|
| 1579 | int rc = lsm_inode_alloc(inode);
|
| 1580 |
|
| 1581 | if (unlikely(rc))
|
| 1582 | return rc;
|
| 1583 | rc = call_int_hook(inode_alloc_security, 0, inode);
|
| 1584 | if (unlikely(rc))
|
| 1585 | security_inode_free(inode);
|
| 1586 | return rc;
|
| 1587 | }
|
| 1588 |
|
| 1589 | static void inode_free_by_rcu(struct rcu_head *head)
|
| 1590 | {
|
| 1591 | |
| 1592 | * The rcu head is at the start of the inode blob
|
| 1593 |
|
| 1594 | kmem_cache_free(lsm_inode_cache, head);
|
| 1595 | }
|
| 1596 |
|
| 1597 | |
| 1598 | * security_inode_free() - Free an inode's LSM blob
|
| 1599 | * @inode: the inode
|
| 1600 | *
|
| 1601 | * Deallocate the inode security structure and set @inode->i_security to NULL.
|
| 1602 |
|
| 1603 | void security_inode_free(struct inode *inode)
|
| 1604 | {
|
| 1605 | integrity_inode_free(inode);
|
| 1606 | call_void_hook(inode_free_security, inode);
|
| 1607 | |
| 1608 | * The inode may still be referenced in a path walk and
|
| 1609 | * a call to security_inode_permission() can be made
|
| 1610 | * after inode_free_security() is called. Ideally, the VFS
|
| 1611 | * wouldn't do this, but fixing that is a much harder
|
| 1612 | * job. For now, simply free the i_security via RCU, and
|
| 1613 | * leave the current inode->i_security pointer intact.
|
| 1614 | * The inode will be freed after the RCU grace period too.
|
| 1615 |
|
| 1616 | if (inode->i_security)
|
| 1617 | call_rcu((struct rcu_head *)inode->i_security,
|
| 1618 | inode_free_by_rcu);
|
| 1619 | }
|
| 1620 |
|
| 1621 | |
| 1622 | * security_dentry_init_security() - Perform dentry initialization
|
| 1623 | * @dentry: the dentry to initialize
|
| 1624 | * @mode: mode used to determine resource type
|
| 1625 | * @name: name of the last path component
|
| 1626 | * @xattr_name: name of the security/LSM xattr
|
| 1627 | * @ctx: pointer to the resulting LSM context
|
| 1628 | * @ctxlen: length of @ctx
|
| 1629 | *
|
| 1630 | * Compute a context for a dentry as the inode is not yet available since NFSv4
|
| 1631 | * has no label backed by an EA anyway. It is important to note that
|
| 1632 | * @xattr_name does not need to be free'd by the caller, it is a static string.
|
| 1633 | *
|
| 1634 | * Return: Returns 0 on success, negative values on failure.
|
| 1635 |
|
| 1636 | int security_dentry_init_security(struct dentry *dentry, int mode,
|
| 1637 | const struct qstr *name,
|
| 1638 | const char **xattr_name, void **ctx,
|
| 1639 | u32 *ctxlen)
|
| 1640 | {
|
| 1641 | struct security_hook_list *hp;
|
| 1642 | int rc;
|
| 1643 |
|
| 1644 | |
| 1645 | * Only one module will provide a security context.
|
| 1646 |
|
| 1647 | hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security,
|
| 1648 | list) {
|
| 1649 | rc = hp->hook.dentry_init_security(dentry, mode, name,
|
| 1650 | xattr_name, ctx, ctxlen);
|
| 1651 | if (rc != LSM_RET_DEFAULT(dentry_init_security))
|
| 1652 | return rc;
|
| 1653 | }
|
| 1654 | return LSM_RET_DEFAULT(dentry_init_security);
|
| 1655 | }
|
| 1656 | EXPORT_SYMBOL(security_dentry_init_security);
|
| 1657 |
|
| 1658 | |
| 1659 | * security_dentry_create_files_as() - Perform dentry initialization
|
| 1660 | * @dentry: the dentry to initialize
|
| 1661 | * @mode: mode used to determine resource type
|
| 1662 | * @name: name of the last path component
|
| 1663 | * @old: creds to use for LSM context calculations
|
| 1664 | * @new: creds to modify
|
| 1665 | *
|
| 1666 | * Compute a context for a dentry as the inode is not yet available and set
|
| 1667 | * that context in passed in creds so that new files are created using that
|
| 1668 | * context. Context is calculated using the passed in creds and not the creds
|
| 1669 | * of the caller.
|
| 1670 | *
|
| 1671 | * Return: Returns 0 on success, error on failure.
|
| 1672 |
|
| 1673 | int security_dentry_create_files_as(struct dentry *dentry, int mode,
|
| 1674 | struct qstr *name,
|
| 1675 | const struct cred *old, struct cred *new)
|
| 1676 | {
|
| 1677 | return call_int_hook(dentry_create_files_as, 0, dentry, mode,
|
| 1678 | name, old, new);
|
| 1679 | }
|
| 1680 | EXPORT_SYMBOL(security_dentry_create_files_as);
|
| 1681 |
|
| 1682 | |
| 1683 | * security_inode_init_security() - Initialize an inode's LSM context
|
| 1684 | * @inode: the inode
|
| 1685 | * @dir: parent directory
|
| 1686 | * @qstr: last component of the pathname
|
| 1687 | * @initxattrs: callback function to write xattrs
|
| 1688 | * @fs_data: filesystem specific data
|
| 1689 | *
|
| 1690 | * Obtain the security attribute name suffix and value to set on a newly
|
| 1691 | * created inode and set up the incore security field for the new inode. This
|
| 1692 | * hook is called by the fs code as part of the inode creation transaction and
|
| 1693 | * provides for atomic labeling of the inode, unlike the post_create/mkdir/...
|
| 1694 | * hooks called by the VFS.
|
| 1695 | *
|
| 1696 | * The hook function is expected to populate the xattrs array, by calling
|
| 1697 | * lsm_get_xattr_slot() to retrieve the slots reserved by the security module
|
| 1698 | * with the lbs_xattr_count field of the lsm_blob_sizes structure. For each
|
| 1699 | * slot, the hook function should set ->name to the attribute name suffix
|
| 1700 | * (e.g. selinux), to allocate ->value (will be freed by the caller) and set it
|
| 1701 | * to the attribute value, to set ->value_len to the length of the value. If
|
| 1702 | * the security module does not use security attributes or does not wish to put
|
| 1703 | * a security attribute on this particular inode, then it should return
|
| 1704 | * -EOPNOTSUPP to skip this processing.
|
| 1705 | *
|
| 1706 | * Return: Returns 0 if the LSM successfully initialized all of the inode
|
| 1707 | * security attributes that are required, negative values otherwise.
|
| 1708 |
|
| 1709 | int security_inode_init_security(struct inode *inode, struct inode *dir,
|
| 1710 | const struct qstr *qstr,
|
| 1711 | const initxattrs initxattrs, void *fs_data)
|
| 1712 | {
|
| 1713 | struct security_hook_list *hp;
|
| 1714 | struct xattr *new_xattrs = NULL;
|
| 1715 | int ret = -EOPNOTSUPP, xattr_count = 0;
|
| 1716 |
|
| 1717 | if (unlikely(IS_PRIVATE(inode)))
|
| 1718 | return 0;
|
| 1719 |
|
| 1720 | if (!blob_sizes.lbs_xattr_count)
|
| 1721 | return 0;
|
| 1722 |
|
| 1723 | if (initxattrs) {
|
| 1724 |
|
| 1725 | new_xattrs = kcalloc(blob_sizes.lbs_xattr_count + 2,
|
| 1726 | sizeof(*new_xattrs), GFP_NOFS);
|
| 1727 | if (!new_xattrs)
|
| 1728 | return -ENOMEM;
|
| 1729 | }
|
| 1730 |
|
| 1731 | hlist_for_each_entry(hp, &security_hook_heads.inode_init_security,
|
| 1732 | list) {
|
| 1733 | ret = hp->hook.inode_init_security(inode, dir, qstr, new_xattrs,
|
| 1734 | &xattr_count);
|
| 1735 | if (ret && ret != -EOPNOTSUPP)
|
| 1736 | goto out;
|
| 1737 | |
| 1738 | * As documented in lsm_hooks.h, -EOPNOTSUPP in this context
|
| 1739 | * means that the LSM is not willing to provide an xattr, not
|
| 1740 | * that it wants to signal an error. Thus, continue to invoke
|
| 1741 | * the remaining LSMs.
|
| 1742 |
|
| 1743 | }
|
| 1744 |
|
| 1745 |
|
| 1746 | if (!xattr_count)
|
| 1747 | goto out;
|
| 1748 |
|
| 1749 | ret = evm_inode_init_security(inode, dir, qstr, new_xattrs,
|
| 1750 | &xattr_count);
|
| 1751 | if (ret)
|
| 1752 | goto out;
|
| 1753 | ret = initxattrs(inode, new_xattrs, fs_data);
|
| 1754 | out:
|
| 1755 | for (; xattr_count > 0; xattr_count--)
|
| 1756 | kfree(new_xattrs[xattr_count - 1].value);
|
| 1757 | kfree(new_xattrs);
|
| 1758 | return (ret == -EOPNOTSUPP) ? 0 : ret;
|
| 1759 | }
|
| 1760 | EXPORT_SYMBOL(security_inode_init_security);
|
| 1761 |
|
| 1762 | |
| 1763 | * security_inode_init_security_anon() - Initialize an anonymous inode
|
| 1764 | * @inode: the inode
|
| 1765 | * @name: the anonymous inode class
|
| 1766 | * @context_inode: an optional related inode
|
| 1767 | *
|
| 1768 | * Set up the incore security field for the new anonymous inode and return
|
| 1769 | * whether the inode creation is permitted by the security module or not.
|
| 1770 | *
|
| 1771 | * Return: Returns 0 on success, -EACCES if the security module denies the
|
| 1772 | * creation of this inode, or another -errno upon other errors.
|
| 1773 |
|
| 1774 | int security_inode_init_security_anon(struct inode *inode,
|
| 1775 | const struct qstr *name,
|
| 1776 | const struct inode *context_inode)
|
| 1777 | {
|
| 1778 | return call_int_hook(inode_init_security_anon, 0, inode, name,
|
| 1779 | context_inode);
|
| 1780 | }
|
| 1781 |
|
| 1782 | #ifdef CONFIG_SECURITY_PATH
|
| 1783 | |
| 1784 | * security_path_mknod() - Check if creating a special file is allowed
|
| 1785 | * @dir: parent directory
|
| 1786 | * @dentry: new file
|
| 1787 | * @mode: new file mode
|
| 1788 | * @dev: device number
|
| 1789 | *
|
| 1790 | * Check permissions when creating a file. Note that this hook is called even
|
| 1791 | * if mknod operation is being done for a regular file.
|
| 1792 | *
|
| 1793 | * Return: Returns 0 if permission is granted.
|
| 1794 |
|
| 1795 | int security_path_mknod(const struct path *dir, struct dentry *dentry,
|
| 1796 | umode_t mode, unsigned int dev)
|
| 1797 | {
|
| 1798 | if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
| 1799 | return 0;
|
| 1800 | return call_int_hook(path_mknod, 0, dir, dentry, mode, dev);
|
| 1801 | }
|
| 1802 | EXPORT_SYMBOL(security_path_mknod);
|
| 1803 |
|
| 1804 | |
| 1805 | * security_path_mkdir() - Check if creating a new directory is allowed
|
| 1806 | * @dir: parent directory
|
| 1807 | * @dentry: new directory
|
| 1808 | * @mode: new directory mode
|
| 1809 | *
|
| 1810 | * Check permissions to create a new directory in the existing directory.
|
| 1811 | *
|
| 1812 | * Return: Returns 0 if permission is granted.
|
| 1813 |
|
| 1814 | int security_path_mkdir(const struct path *dir, struct dentry *dentry,
|
| 1815 | umode_t mode)
|
| 1816 | {
|
| 1817 | if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
| 1818 | return 0;
|
| 1819 | return call_int_hook(path_mkdir, 0, dir, dentry, mode);
|
| 1820 | }
|
| 1821 | EXPORT_SYMBOL(security_path_mkdir);
|
| 1822 |
|
| 1823 | |
| 1824 | * security_path_rmdir() - Check if removing a directory is allowed
|
| 1825 | * @dir: parent directory
|
| 1826 | * @dentry: directory to remove
|
| 1827 | *
|
| 1828 | * Check the permission to remove a directory.
|
| 1829 | *
|
| 1830 | * Return: Returns 0 if permission is granted.
|
| 1831 |
|
| 1832 | int security_path_rmdir(const struct path *dir, struct dentry *dentry)
|
| 1833 | {
|
| 1834 | if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
| 1835 | return 0;
|
| 1836 | return call_int_hook(path_rmdir, 0, dir, dentry);
|
| 1837 | }
|
| 1838 |
|
| 1839 | |
| 1840 | * security_path_unlink() - Check if removing a hard link is allowed
|
| 1841 | * @dir: parent directory
|
| 1842 | * @dentry: file
|
| 1843 | *
|
| 1844 | * Check the permission to remove a hard link to a file.
|
| 1845 | *
|
| 1846 | * Return: Returns 0 if permission is granted.
|
| 1847 |
|
| 1848 | int security_path_unlink(const struct path *dir, struct dentry *dentry)
|
| 1849 | {
|
| 1850 | if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
| 1851 | return 0;
|
| 1852 | return call_int_hook(path_unlink, 0, dir, dentry);
|
| 1853 | }
|
| 1854 | EXPORT_SYMBOL(security_path_unlink);
|
| 1855 |
|
| 1856 | |
| 1857 | * security_path_symlink() - Check if creating a symbolic link is allowed
|
| 1858 | * @dir: parent directory
|
| 1859 | * @dentry: symbolic link
|
| 1860 | * @old_name: file pathname
|
| 1861 | *
|
| 1862 | * Check the permission to create a symbolic link to a file.
|
| 1863 | *
|
| 1864 | * Return: Returns 0 if permission is granted.
|
| 1865 |
|
| 1866 | int security_path_symlink(const struct path *dir, struct dentry *dentry,
|
| 1867 | const char *old_name)
|
| 1868 | {
|
| 1869 | if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
| 1870 | return 0;
|
| 1871 | return call_int_hook(path_symlink, 0, dir, dentry, old_name);
|
| 1872 | }
|
| 1873 |
|
| 1874 | |
| 1875 | * security_path_link - Check if creating a hard link is allowed
|
| 1876 | * @old_dentry: existing file
|
| 1877 | * @new_dir: new parent directory
|
| 1878 | * @new_dentry: new link
|
| 1879 | *
|
| 1880 | * Check permission before creating a new hard link to a file.
|
| 1881 | *
|
| 1882 | * Return: Returns 0 if permission is granted.
|
| 1883 |
|
| 1884 | int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
|
| 1885 | struct dentry *new_dentry)
|
| 1886 | {
|
| 1887 | if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
|
| 1888 | return 0;
|
| 1889 | return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry);
|
| 1890 | }
|
| 1891 |
|
| 1892 | |
| 1893 | * security_path_rename() - Check if renaming a file is allowed
|
| 1894 | * @old_dir: parent directory of the old file
|
| 1895 | * @old_dentry: the old file
|
| 1896 | * @new_dir: parent directory of the new file
|
| 1897 | * @new_dentry: the new file
|
| 1898 | * @flags: flags
|
| 1899 | *
|
| 1900 | * Check for permission to rename a file or directory.
|
| 1901 | *
|
| 1902 | * Return: Returns 0 if permission is granted.
|
| 1903 |
|
| 1904 | int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
|
| 1905 | const struct path *new_dir, struct dentry *new_dentry,
|
| 1906 | unsigned int flags)
|
| 1907 | {
|
| 1908 | if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
|
| 1909 | (d_is_positive(new_dentry) &&
|
| 1910 | IS_PRIVATE(d_backing_inode(new_dentry)))))
|
| 1911 | return 0;
|
| 1912 |
|
| 1913 | return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir,
|
| 1914 | new_dentry, flags);
|
| 1915 | }
|
| 1916 | EXPORT_SYMBOL(security_path_rename);
|
| 1917 |
|
| 1918 | |
| 1919 | * security_path_truncate() - Check if truncating a file is allowed
|
| 1920 | * @path: file
|
| 1921 | *
|
| 1922 | * Check permission before truncating the file indicated by path. Note that
|
| 1923 | * truncation permissions may also be checked based on already opened files,
|
| 1924 | * using the security_file_truncate() hook.
|
| 1925 | *
|
| 1926 | * Return: Returns 0 if permission is granted.
|
| 1927 |
|
| 1928 | int security_path_truncate(const struct path *path)
|
| 1929 | {
|
| 1930 | if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
|
| 1931 | return 0;
|
| 1932 | return call_int_hook(path_truncate, 0, path);
|
| 1933 | }
|
| 1934 |
|
| 1935 | |
| 1936 | * security_path_chmod() - Check if changing the file's mode is allowed
|
| 1937 | * @path: file
|
| 1938 | * @mode: new mode
|
| 1939 | *
|
| 1940 | * Check for permission to change a mode of the file @path. The new mode is
|
| 1941 | * specified in @mode which is a bitmask of constants from
|
| 1942 | * <include/uapi/linux/stat.h>.
|
| 1943 | *
|
| 1944 | * Return: Returns 0 if permission is granted.
|
| 1945 |
|
| 1946 | int security_path_chmod(const struct path *path, umode_t mode)
|
| 1947 | {
|
| 1948 | if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
|
| 1949 | return 0;
|
| 1950 | return call_int_hook(path_chmod, 0, path, mode);
|
| 1951 | }
|
| 1952 |
|
| 1953 | |
| 1954 | * security_path_chown() - Check if changing the file's owner/group is allowed
|
| 1955 | * @path: file
|
| 1956 | * @uid: file owner
|
| 1957 | * @gid: file group
|
| 1958 | *
|
| 1959 | * Check for permission to change owner/group of a file or directory.
|
| 1960 | *
|
| 1961 | * Return: Returns 0 if permission is granted.
|
| 1962 |
|
| 1963 | int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
|
| 1964 | {
|
| 1965 | if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
|
| 1966 | return 0;
|
| 1967 | return call_int_hook(path_chown, 0, path, uid, gid);
|
| 1968 | }
|
| 1969 |
|
| 1970 | |
| 1971 | * security_path_chroot() - Check if changing the root directory is allowed
|
| 1972 | * @path: directory
|
| 1973 | *
|
| 1974 | * Check for permission to change root directory.
|
| 1975 | *
|
| 1976 | * Return: Returns 0 if permission is granted.
|
| 1977 |
|
| 1978 | int security_path_chroot(const struct path *path)
|
| 1979 | {
|
| 1980 | return call_int_hook(path_chroot, 0, path);
|
| 1981 | }
|
| 1982 | #endif
|
| 1983 |
|
| 1984 | |
| 1985 | * security_inode_create() - Check if creating a file is allowed
|
| 1986 | * @dir: the parent directory
|
| 1987 | * @dentry: the file being created
|
| 1988 | * @mode: requested file mode
|
| 1989 | *
|
| 1990 | * Check permission to create a regular file.
|
| 1991 | *
|
| 1992 | * Return: Returns 0 if permission is granted.
|
| 1993 |
|
| 1994 | int security_inode_create(struct inode *dir, struct dentry *dentry,
|
| 1995 | umode_t mode)
|
| 1996 | {
|
| 1997 | if (unlikely(IS_PRIVATE(dir)))
|
| 1998 | return 0;
|
| 1999 | return call_int_hook(inode_create, 0, dir, dentry, mode);
|
| 2000 | }
|
| 2001 | EXPORT_SYMBOL_GPL(security_inode_create);
|
| 2002 |
|
| 2003 | |
| 2004 | * security_inode_link() - Check if creating a hard link is allowed
|
| 2005 | * @old_dentry: existing file
|
| 2006 | * @dir: new parent directory
|
| 2007 | * @new_dentry: new link
|
| 2008 | *
|
| 2009 | * Check permission before creating a new hard link to a file.
|
| 2010 | *
|
| 2011 | * Return: Returns 0 if permission is granted.
|
| 2012 |
|
| 2013 | int security_inode_link(struct dentry *old_dentry, struct inode *dir,
|
| 2014 | struct dentry *new_dentry)
|
| 2015 | {
|
| 2016 | if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
|
| 2017 | return 0;
|
| 2018 | return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry);
|
| 2019 | }
|
| 2020 |
|
| 2021 | |
| 2022 | * security_inode_unlink() - Check if removing a hard link is allowed
|
| 2023 | * @dir: parent directory
|
| 2024 | * @dentry: file
|
| 2025 | *
|
| 2026 | * Check the permission to remove a hard link to a file.
|
| 2027 | *
|
| 2028 | * Return: Returns 0 if permission is granted.
|
| 2029 |
|
| 2030 | int security_inode_unlink(struct inode *dir, struct dentry *dentry)
|
| 2031 | {
|
| 2032 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2033 | return 0;
|
| 2034 | return call_int_hook(inode_unlink, 0, dir, dentry);
|
| 2035 | }
|
| 2036 |
|
| 2037 | |
| 2038 | * security_inode_symlink() - Check if creating a symbolic link is allowed
|
| 2039 | * @dir: parent directory
|
| 2040 | * @dentry: symbolic link
|
| 2041 | * @old_name: existing filename
|
| 2042 | *
|
| 2043 | * Check the permission to create a symbolic link to a file.
|
| 2044 | *
|
| 2045 | * Return: Returns 0 if permission is granted.
|
| 2046 |
|
| 2047 | int security_inode_symlink(struct inode *dir, struct dentry *dentry,
|
| 2048 | const char *old_name)
|
| 2049 | {
|
| 2050 | if (unlikely(IS_PRIVATE(dir)))
|
| 2051 | return 0;
|
| 2052 | return call_int_hook(inode_symlink, 0, dir, dentry, old_name);
|
| 2053 | }
|
| 2054 |
|
| 2055 | |
| 2056 | * security_inode_mkdir() - Check if creation a new director is allowed
|
| 2057 | * @dir: parent directory
|
| 2058 | * @dentry: new directory
|
| 2059 | * @mode: new directory mode
|
| 2060 | *
|
| 2061 | * Check permissions to create a new directory in the existing directory
|
| 2062 | * associated with inode structure @dir.
|
| 2063 | *
|
| 2064 | * Return: Returns 0 if permission is granted.
|
| 2065 |
|
| 2066 | int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
| 2067 | {
|
| 2068 | if (unlikely(IS_PRIVATE(dir)))
|
| 2069 | return 0;
|
| 2070 | return call_int_hook(inode_mkdir, 0, dir, dentry, mode);
|
| 2071 | }
|
| 2072 | EXPORT_SYMBOL_GPL(security_inode_mkdir);
|
| 2073 |
|
| 2074 | |
| 2075 | * security_inode_rmdir() - Check if removing a directory is allowed
|
| 2076 | * @dir: parent directory
|
| 2077 | * @dentry: directory to be removed
|
| 2078 | *
|
| 2079 | * Check the permission to remove a directory.
|
| 2080 | *
|
| 2081 | * Return: Returns 0 if permission is granted.
|
| 2082 |
|
| 2083 | int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
|
| 2084 | {
|
| 2085 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2086 | return 0;
|
| 2087 | return call_int_hook(inode_rmdir, 0, dir, dentry);
|
| 2088 | }
|
| 2089 |
|
| 2090 | |
| 2091 | * security_inode_mknod() - Check if creating a special file is allowed
|
| 2092 | * @dir: parent directory
|
| 2093 | * @dentry: new file
|
| 2094 | * @mode: new file mode
|
| 2095 | * @dev: device number
|
| 2096 | *
|
| 2097 | * Check permissions when creating a special file (or a socket or a fifo file
|
| 2098 | * created via the mknod system call). Note that if mknod operation is being
|
| 2099 | * done for a regular file, then the create hook will be called and not this
|
| 2100 | * hook.
|
| 2101 | *
|
| 2102 | * Return: Returns 0 if permission is granted.
|
| 2103 |
|
| 2104 | int security_inode_mknod(struct inode *dir, struct dentry *dentry,
|
| 2105 | umode_t mode, dev_t dev)
|
| 2106 | {
|
| 2107 | if (unlikely(IS_PRIVATE(dir)))
|
| 2108 | return 0;
|
| 2109 | return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev);
|
| 2110 | }
|
| 2111 |
|
| 2112 | |
| 2113 | * security_inode_rename() - Check if renaming a file is allowed
|
| 2114 | * @old_dir: parent directory of the old file
|
| 2115 | * @old_dentry: the old file
|
| 2116 | * @new_dir: parent directory of the new file
|
| 2117 | * @new_dentry: the new file
|
| 2118 | * @flags: flags
|
| 2119 | *
|
| 2120 | * Check for permission to rename a file or directory.
|
| 2121 | *
|
| 2122 | * Return: Returns 0 if permission is granted.
|
| 2123 |
|
| 2124 | int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
|
| 2125 | struct inode *new_dir, struct dentry *new_dentry,
|
| 2126 | unsigned int flags)
|
| 2127 | {
|
| 2128 | if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
|
| 2129 | (d_is_positive(new_dentry) &&
|
| 2130 | IS_PRIVATE(d_backing_inode(new_dentry)))))
|
| 2131 | return 0;
|
| 2132 |
|
| 2133 | if (flags & RENAME_EXCHANGE) {
|
| 2134 | int err = call_int_hook(inode_rename, 0, new_dir, new_dentry,
|
| 2135 | old_dir, old_dentry);
|
| 2136 | if (err)
|
| 2137 | return err;
|
| 2138 | }
|
| 2139 |
|
| 2140 | return call_int_hook(inode_rename, 0, old_dir, old_dentry,
|
| 2141 | new_dir, new_dentry);
|
| 2142 | }
|
| 2143 |
|
| 2144 | |
| 2145 | * security_inode_readlink() - Check if reading a symbolic link is allowed
|
| 2146 | * @dentry: link
|
| 2147 | *
|
| 2148 | * Check the permission to read the symbolic link.
|
| 2149 | *
|
| 2150 | * Return: Returns 0 if permission is granted.
|
| 2151 |
|
| 2152 | int security_inode_readlink(struct dentry *dentry)
|
| 2153 | {
|
| 2154 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2155 | return 0;
|
| 2156 | return call_int_hook(inode_readlink, 0, dentry);
|
| 2157 | }
|
| 2158 |
|
| 2159 | |
| 2160 | * security_inode_follow_link() - Check if following a symbolic link is allowed
|
| 2161 | * @dentry: link dentry
|
| 2162 | * @inode: link inode
|
| 2163 | * @rcu: true if in RCU-walk mode
|
| 2164 | *
|
| 2165 | * Check permission to follow a symbolic link when looking up a pathname. If
|
| 2166 | * @rcu is true, @inode is not stable.
|
| 2167 | *
|
| 2168 | * Return: Returns 0 if permission is granted.
|
| 2169 |
|
| 2170 | int security_inode_follow_link(struct dentry *dentry, struct inode *inode,
|
| 2171 | bool rcu)
|
| 2172 | {
|
| 2173 | if (unlikely(IS_PRIVATE(inode)))
|
| 2174 | return 0;
|
| 2175 | return call_int_hook(inode_follow_link, 0, dentry, inode, rcu);
|
| 2176 | }
|
| 2177 |
|
| 2178 | |
| 2179 | * security_inode_permission() - Check if accessing an inode is allowed
|
| 2180 | * @inode: inode
|
| 2181 | * @mask: access mask
|
| 2182 | *
|
| 2183 | * Check permission before accessing an inode. This hook is called by the
|
| 2184 | * existing Linux permission function, so a security module can use it to
|
| 2185 | * provide additional checking for existing Linux permission checks. Notice
|
| 2186 | * that this hook is called when a file is opened (as well as many other
|
| 2187 | * operations), whereas the file_security_ops permission hook is called when
|
| 2188 | * the actual read/write operations are performed.
|
| 2189 | *
|
| 2190 | * Return: Returns 0 if permission is granted.
|
| 2191 |
|
| 2192 | int security_inode_permission(struct inode *inode, int mask)
|
| 2193 | {
|
| 2194 | if (unlikely(IS_PRIVATE(inode)))
|
| 2195 | return 0;
|
| 2196 | return call_int_hook(inode_permission, 0, inode, mask);
|
| 2197 | }
|
| 2198 |
|
| 2199 | |
| 2200 | * security_inode_setattr() - Check if setting file attributes is allowed
|
| 2201 | * @idmap: idmap of the mount
|
| 2202 | * @dentry: file
|
| 2203 | * @attr: new attributes
|
| 2204 | *
|
| 2205 | * Check permission before setting file attributes. Note that the kernel call
|
| 2206 | * to notify_change is performed from several locations, whenever file
|
| 2207 | * attributes change (such as when a file is truncated, chown/chmod operations,
|
| 2208 | * transferring disk quotas, etc).
|
| 2209 | *
|
| 2210 | * Return: Returns 0 if permission is granted.
|
| 2211 |
|
| 2212 | int security_inode_setattr(struct mnt_idmap *idmap,
|
| 2213 | struct dentry *dentry, struct iattr *attr)
|
| 2214 | {
|
| 2215 | int ret;
|
| 2216 |
|
| 2217 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2218 | return 0;
|
| 2219 | ret = call_int_hook(inode_setattr, 0, dentry, attr);
|
| 2220 | if (ret)
|
| 2221 | return ret;
|
| 2222 | return evm_inode_setattr(idmap, dentry, attr);
|
| 2223 | }
|
| 2224 | EXPORT_SYMBOL_GPL(security_inode_setattr);
|
| 2225 |
|
| 2226 | |
| 2227 | * security_inode_getattr() - Check if getting file attributes is allowed
|
| 2228 | * @path: file
|
| 2229 | *
|
| 2230 | * Check permission before obtaining file attributes.
|
| 2231 | *
|
| 2232 | * Return: Returns 0 if permission is granted.
|
| 2233 |
|
| 2234 | int security_inode_getattr(const struct path *path)
|
| 2235 | {
|
| 2236 | if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
|
| 2237 | return 0;
|
| 2238 | return call_int_hook(inode_getattr, 0, path);
|
| 2239 | }
|
| 2240 |
|
| 2241 | |
| 2242 | * security_inode_setxattr() - Check if setting file xattrs is allowed
|
| 2243 | * @idmap: idmap of the mount
|
| 2244 | * @dentry: file
|
| 2245 | * @name: xattr name
|
| 2246 | * @value: xattr value
|
| 2247 | * @size: size of xattr value
|
| 2248 | * @flags: flags
|
| 2249 | *
|
| 2250 | * Check permission before setting the extended attributes.
|
| 2251 | *
|
| 2252 | * Return: Returns 0 if permission is granted.
|
| 2253 |
|
| 2254 | int security_inode_setxattr(struct mnt_idmap *idmap,
|
| 2255 | struct dentry *dentry, const char *name,
|
| 2256 | const void *value, size_t size, int flags)
|
| 2257 | {
|
| 2258 | int ret;
|
| 2259 |
|
| 2260 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2261 | return 0;
|
| 2262 | |
| 2263 | * SELinux and Smack integrate the cap call,
|
| 2264 | * so assume that all LSMs supplying this call do so.
|
| 2265 |
|
| 2266 | ret = call_int_hook(inode_setxattr, 1, idmap, dentry, name, value,
|
| 2267 | size, flags);
|
| 2268 |
|
| 2269 | if (ret == 1)
|
| 2270 | ret = cap_inode_setxattr(dentry, name, value, size, flags);
|
| 2271 | if (ret)
|
| 2272 | return ret;
|
| 2273 | ret = ima_inode_setxattr(dentry, name, value, size);
|
| 2274 | if (ret)
|
| 2275 | return ret;
|
| 2276 | return evm_inode_setxattr(idmap, dentry, name, value, size);
|
| 2277 | }
|
| 2278 |
|
| 2279 | |
| 2280 | * security_inode_set_acl() - Check if setting posix acls is allowed
|
| 2281 | * @idmap: idmap of the mount
|
| 2282 | * @dentry: file
|
| 2283 | * @acl_name: acl name
|
| 2284 | * @kacl: acl struct
|
| 2285 | *
|
| 2286 | * Check permission before setting posix acls, the posix acls in @kacl are
|
| 2287 | * identified by @acl_name.
|
| 2288 | *
|
| 2289 | * Return: Returns 0 if permission is granted.
|
| 2290 |
|
| 2291 | int security_inode_set_acl(struct mnt_idmap *idmap,
|
| 2292 | struct dentry *dentry, const char *acl_name,
|
| 2293 | struct posix_acl *kacl)
|
| 2294 | {
|
| 2295 | int ret;
|
| 2296 |
|
| 2297 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2298 | return 0;
|
| 2299 | ret = call_int_hook(inode_set_acl, 0, idmap, dentry, acl_name,
|
| 2300 | kacl);
|
| 2301 | if (ret)
|
| 2302 | return ret;
|
| 2303 | ret = ima_inode_set_acl(idmap, dentry, acl_name, kacl);
|
| 2304 | if (ret)
|
| 2305 | return ret;
|
| 2306 | return evm_inode_set_acl(idmap, dentry, acl_name, kacl);
|
| 2307 | }
|
| 2308 |
|
| 2309 | |
| 2310 | * security_inode_get_acl() - Check if reading posix acls is allowed
|
| 2311 | * @idmap: idmap of the mount
|
| 2312 | * @dentry: file
|
| 2313 | * @acl_name: acl name
|
| 2314 | *
|
| 2315 | * Check permission before getting osix acls, the posix acls are identified by
|
| 2316 | * @acl_name.
|
| 2317 | *
|
| 2318 | * Return: Returns 0 if permission is granted.
|
| 2319 |
|
| 2320 | int security_inode_get_acl(struct mnt_idmap *idmap,
|
| 2321 | struct dentry *dentry, const char *acl_name)
|
| 2322 | {
|
| 2323 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2324 | return 0;
|
| 2325 | return call_int_hook(inode_get_acl, 0, idmap, dentry, acl_name);
|
| 2326 | }
|
| 2327 |
|
| 2328 | |
| 2329 | * security_inode_remove_acl() - Check if removing a posix acl is allowed
|
| 2330 | * @idmap: idmap of the mount
|
| 2331 | * @dentry: file
|
| 2332 | * @acl_name: acl name
|
| 2333 | *
|
| 2334 | * Check permission before removing posix acls, the posix acls are identified
|
| 2335 | * by @acl_name.
|
| 2336 | *
|
| 2337 | * Return: Returns 0 if permission is granted.
|
| 2338 |
|
| 2339 | int security_inode_remove_acl(struct mnt_idmap *idmap,
|
| 2340 | struct dentry *dentry, const char *acl_name)
|
| 2341 | {
|
| 2342 | int ret;
|
| 2343 |
|
| 2344 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2345 | return 0;
|
| 2346 | ret = call_int_hook(inode_remove_acl, 0, idmap, dentry, acl_name);
|
| 2347 | if (ret)
|
| 2348 | return ret;
|
| 2349 | ret = ima_inode_remove_acl(idmap, dentry, acl_name);
|
| 2350 | if (ret)
|
| 2351 | return ret;
|
| 2352 | return evm_inode_remove_acl(idmap, dentry, acl_name);
|
| 2353 | }
|
| 2354 |
|
| 2355 | |
| 2356 | * security_inode_post_setxattr() - Update the inode after a setxattr operation
|
| 2357 | * @dentry: file
|
| 2358 | * @name: xattr name
|
| 2359 | * @value: xattr value
|
| 2360 | * @size: xattr value size
|
| 2361 | * @flags: flags
|
| 2362 | *
|
| 2363 | * Update inode security field after successful setxattr operation.
|
| 2364 |
|
| 2365 | void security_inode_post_setxattr(struct dentry *dentry, const char *name,
|
| 2366 | const void *value, size_t size, int flags)
|
| 2367 | {
|
| 2368 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2369 | return;
|
| 2370 | call_void_hook(inode_post_setxattr, dentry, name, value, size, flags);
|
| 2371 | evm_inode_post_setxattr(dentry, name, value, size);
|
| 2372 | }
|
| 2373 |
|
| 2374 | |
| 2375 | * security_inode_getxattr() - Check if xattr access is allowed
|
| 2376 | * @dentry: file
|
| 2377 | * @name: xattr name
|
| 2378 | *
|
| 2379 | * Check permission before obtaining the extended attributes identified by
|
| 2380 | * @name for @dentry.
|
| 2381 | *
|
| 2382 | * Return: Returns 0 if permission is granted.
|
| 2383 |
|
| 2384 | int security_inode_getxattr(struct dentry *dentry, const char *name)
|
| 2385 | {
|
| 2386 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2387 | return 0;
|
| 2388 | return call_int_hook(inode_getxattr, 0, dentry, name);
|
| 2389 | }
|
| 2390 |
|
| 2391 | |
| 2392 | * security_inode_listxattr() - Check if listing xattrs is allowed
|
| 2393 | * @dentry: file
|
| 2394 | *
|
| 2395 | * Check permission before obtaining the list of extended attribute names for
|
| 2396 | * @dentry.
|
| 2397 | *
|
| 2398 | * Return: Returns 0 if permission is granted.
|
| 2399 |
|
| 2400 | int security_inode_listxattr(struct dentry *dentry)
|
| 2401 | {
|
| 2402 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2403 | return 0;
|
| 2404 | return call_int_hook(inode_listxattr, 0, dentry);
|
| 2405 | }
|
| 2406 |
|
| 2407 | |
| 2408 | * security_inode_removexattr() - Check if removing an xattr is allowed
|
| 2409 | * @idmap: idmap of the mount
|
| 2410 | * @dentry: file
|
| 2411 | * @name: xattr name
|
| 2412 | *
|
| 2413 | * Check permission before removing the extended attribute identified by @name
|
| 2414 | * for @dentry.
|
| 2415 | *
|
| 2416 | * Return: Returns 0 if permission is granted.
|
| 2417 |
|
| 2418 | int security_inode_removexattr(struct mnt_idmap *idmap,
|
| 2419 | struct dentry *dentry, const char *name)
|
| 2420 | {
|
| 2421 | int ret;
|
| 2422 |
|
| 2423 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
| 2424 | return 0;
|
| 2425 | |
| 2426 | * SELinux and Smack integrate the cap call,
|
| 2427 | * so assume that all LSMs supplying this call do so.
|
| 2428 |
|
| 2429 | ret = call_int_hook(inode_removexattr, 1, idmap, dentry, name);
|
| 2430 | if (ret == 1)
|
| 2431 | ret = cap_inode_removexattr(idmap, dentry, name);
|
| 2432 | if (ret)
|
| 2433 | return ret;
|
| 2434 | ret = ima_inode_removexattr(dentry, name);
|
| 2435 | if (ret)
|
| 2436 | return ret;
|
| 2437 | return evm_inode_removexattr(idmap, dentry, name);
|
| 2438 | }
|
| 2439 |
|
| 2440 | |
| 2441 | * security_inode_need_killpriv() - Check if security_inode_killpriv() required
|
| 2442 | * @dentry: associated dentry
|
| 2443 | *
|
| 2444 | * Called when an inode has been changed to determine if
|
| 2445 | * security_inode_killpriv() should be called.
|
| 2446 | *
|
| 2447 | * Return: Return <0 on error to abort the inode change operation, return 0 if
|
| 2448 | * security_inode_killpriv() does not need to be called, return >0 if
|
| 2449 | * security_inode_killpriv() does need to be called.
|
| 2450 |
|
| 2451 | int security_inode_need_killpriv(struct dentry *dentry)
|
| 2452 | {
|
| 2453 | return call_int_hook(inode_need_killpriv, 0, dentry);
|
| 2454 | }
|
| 2455 |
|
| 2456 | |
| 2457 | * security_inode_killpriv() - The setuid bit is removed, update LSM state
|
| 2458 | * @idmap: idmap of the mount
|
| 2459 | * @dentry: associated dentry
|
| 2460 | *
|
| 2461 | * The @dentry's setuid bit is being removed. Remove similar security labels.
|
| 2462 | * Called with the dentry->d_inode->i_mutex held.
|
| 2463 | *
|
| 2464 | * Return: Return 0 on success. If error is returned, then the operation
|
| 2465 | * causing setuid bit removal is failed.
|
| 2466 |
|
| 2467 | int security_inode_killpriv(struct mnt_idmap *idmap,
|
| 2468 | struct dentry *dentry)
|
| 2469 | {
|
| 2470 | return call_int_hook(inode_killpriv, 0, idmap, dentry);
|
| 2471 | }
|
| 2472 |
|
| 2473 | |
| 2474 | * security_inode_getsecurity() - Get the xattr security label of an inode
|
| 2475 | * @idmap: idmap of the mount
|
| 2476 | * @inode: inode
|
| 2477 | * @name: xattr name
|
| 2478 | * @buffer: security label buffer
|
| 2479 | * @alloc: allocation flag
|
| 2480 | *
|
| 2481 | * Retrieve a copy of the extended attribute representation of the security
|
| 2482 | * label associated with @name for @inode via @buffer. Note that @name is the
|
| 2483 | * remainder of the attribute name after the security prefix has been removed.
|
| 2484 | * @alloc is used to specify if the call should return a value via the buffer
|
| 2485 | * or just the value length.
|
| 2486 | *
|
| 2487 | * Return: Returns size of buffer on success.
|
| 2488 |
|
| 2489 | int security_inode_getsecurity(struct mnt_idmap *idmap,
|
| 2490 | struct inode *inode, const char *name,
|
| 2491 | void **buffer, bool alloc)
|
| 2492 | {
|
| 2493 | struct security_hook_list *hp;
|
| 2494 | int rc;
|
| 2495 |
|
| 2496 | if (unlikely(IS_PRIVATE(inode)))
|
| 2497 | return LSM_RET_DEFAULT(inode_getsecurity);
|
| 2498 | |
| 2499 | * Only one module will provide an attribute with a given name.
|
| 2500 |
|
| 2501 | hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
|
| 2502 | rc = hp->hook.inode_getsecurity(idmap, inode, name, buffer,
|
| 2503 | alloc);
|
| 2504 | if (rc != LSM_RET_DEFAULT(inode_getsecurity))
|
| 2505 | return rc;
|
| 2506 | }
|
| 2507 | return LSM_RET_DEFAULT(inode_getsecurity);
|
| 2508 | }
|
| 2509 |
|
| 2510 | |
| 2511 | * security_inode_setsecurity() - Set the xattr security label of an inode
|
| 2512 | * @inode: inode
|
| 2513 | * @name: xattr name
|
| 2514 | * @value: security label
|
| 2515 | * @size: length of security label
|
| 2516 | * @flags: flags
|
| 2517 | *
|
| 2518 | * Set the security label associated with @name for @inode from the extended
|
| 2519 | * attribute value @value. @size indicates the size of the @value in bytes.
|
| 2520 | * @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the
|
| 2521 | * remainder of the attribute name after the security. prefix has been removed.
|
| 2522 | *
|
| 2523 | * Return: Returns 0 on success.
|
| 2524 |
|
| 2525 | int security_inode_setsecurity(struct inode *inode, const char *name,
|
| 2526 | const void *value, size_t size, int flags)
|
| 2527 | {
|
| 2528 | struct security_hook_list *hp;
|
| 2529 | int rc;
|
| 2530 |
|
| 2531 | if (unlikely(IS_PRIVATE(inode)))
|
| 2532 | return LSM_RET_DEFAULT(inode_setsecurity);
|
| 2533 | |
| 2534 | * Only one module will provide an attribute with a given name.
|
| 2535 |
|
| 2536 | hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
|
| 2537 | rc = hp->hook.inode_setsecurity(inode, name, value, size,
|
| 2538 | flags);
|
| 2539 | if (rc != LSM_RET_DEFAULT(inode_setsecurity))
|
| 2540 | return rc;
|
| 2541 | }
|
| 2542 | return LSM_RET_DEFAULT(inode_setsecurity);
|
| 2543 | }
|
| 2544 |
|
| 2545 | |
| 2546 | * security_inode_listsecurity() - List the xattr security label names
|
| 2547 | * @inode: inode
|
| 2548 | * @buffer: buffer
|
| 2549 | * @buffer_size: size of buffer
|
| 2550 | *
|
| 2551 | * Copy the extended attribute names for the security labels associated with
|
| 2552 | * @inode into @buffer. The maximum size of @buffer is specified by
|
| 2553 | * @buffer_size. @buffer may be NULL to request the size of the buffer
|
| 2554 | * required.
|
| 2555 | *
|
| 2556 | * Return: Returns number of bytes used/required on success.
|
| 2557 |
|
| 2558 | int security_inode_listsecurity(struct inode *inode,
|
| 2559 | char *buffer, size_t buffer_size)
|
| 2560 | {
|
| 2561 | if (unlikely(IS_PRIVATE(inode)))
|
| 2562 | return 0;
|
| 2563 | return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size);
|
| 2564 | }
|
| 2565 | EXPORT_SYMBOL(security_inode_listsecurity);
|
| 2566 |
|
| 2567 | |
| 2568 | * security_inode_getsecid() - Get an inode's secid
|
| 2569 | * @inode: inode
|
| 2570 | * @secid: secid to return
|
| 2571 | *
|
| 2572 | * Get the secid associated with the node. In case of failure, @secid will be
|
| 2573 | * set to zero.
|
| 2574 |
|
| 2575 | void security_inode_getsecid(struct inode *inode, u32 *secid)
|
| 2576 | {
|
| 2577 | call_void_hook(inode_getsecid, inode, secid);
|
| 2578 | }
|
| 2579 |
|
| 2580 | |
| 2581 | * security_inode_copy_up() - Create new creds for an overlayfs copy-up op
|
| 2582 | * @src: union dentry of copy-up file
|
| 2583 | * @new: newly created creds
|
| 2584 | *
|
| 2585 | * A file is about to be copied up from lower layer to upper layer of overlay
|
| 2586 | * filesystem. Security module can prepare a set of new creds and modify as
|
| 2587 | * need be and return new creds. Caller will switch to new creds temporarily to
|
| 2588 | * create new file and release newly allocated creds.
|
| 2589 | *
|
| 2590 | * Return: Returns 0 on success or a negative error code on error.
|
| 2591 |
|
| 2592 | int security_inode_copy_up(struct dentry *src, struct cred **new)
|
| 2593 | {
|
| 2594 | return call_int_hook(inode_copy_up, 0, src, new);
|
| 2595 | }
|
| 2596 | EXPORT_SYMBOL(security_inode_copy_up);
|
| 2597 |
|
| 2598 | |
| 2599 | * security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
|
| 2600 | * @name: xattr name
|
| 2601 | *
|
| 2602 | * Filter the xattrs being copied up when a unioned file is copied up from a
|
| 2603 | * lower layer to the union/overlay layer. The caller is responsible for
|
| 2604 | * reading and writing the xattrs, this hook is merely a filter.
|
| 2605 | *
|
| 2606 | * Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP
|
| 2607 | * if the security module does not know about attribute, or a negative
|
| 2608 | * error code to abort the copy up.
|
| 2609 |
|
| 2610 | int security_inode_copy_up_xattr(const char *name)
|
| 2611 | {
|
| 2612 | struct security_hook_list *hp;
|
| 2613 | int rc;
|
| 2614 |
|
| 2615 | |
| 2616 | * The implementation can return 0 (accept the xattr), 1 (discard the
|
| 2617 | * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
|
| 2618 | * any other error code in case of an error.
|
| 2619 |
|
| 2620 | hlist_for_each_entry(hp,
|
| 2621 | &security_hook_heads.inode_copy_up_xattr, list) {
|
| 2622 | rc = hp->hook.inode_copy_up_xattr(name);
|
| 2623 | if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
|
| 2624 | return rc;
|
| 2625 | }
|
| 2626 |
|
| 2627 | return evm_inode_copy_up_xattr(name);
|
| 2628 | }
|
| 2629 | EXPORT_SYMBOL(security_inode_copy_up_xattr);
|
| 2630 |
|
| 2631 | |
| 2632 | * security_kernfs_init_security() - Init LSM context for a kernfs node
|
| 2633 | * @kn_dir: parent kernfs node
|
| 2634 | * @kn: the kernfs node to initialize
|
| 2635 | *
|
| 2636 | * Initialize the security context of a newly created kernfs node based on its
|
| 2637 | * own and its parent's attributes.
|
| 2638 | *
|
| 2639 | * Return: Returns 0 if permission is granted.
|
| 2640 |
|
| 2641 | int security_kernfs_init_security(struct kernfs_node *kn_dir,
|
| 2642 | struct kernfs_node *kn)
|
| 2643 | {
|
| 2644 | return call_int_hook(kernfs_init_security, 0, kn_dir, kn);
|
| 2645 | }
|
| 2646 |
|
| 2647 | |
| 2648 | * security_file_permission() - Check file permissions
|
| 2649 | * @file: file
|
| 2650 | * @mask: requested permissions
|
| 2651 | *
|
| 2652 | * Check file permissions before accessing an open file. This hook is called
|
| 2653 | * by various operations that read or write files. A security module can use
|
| 2654 | * this hook to perform additional checking on these operations, e.g. to
|
| 2655 | * revalidate permissions on use to support privilege bracketing or policy
|
| 2656 | * changes. Notice that this hook is used when the actual read/write
|
| 2657 | * operations are performed, whereas the inode_security_ops hook is called when
|
| 2658 | * a file is opened (as well as many other operations). Although this hook can
|
| 2659 | * be used to revalidate permissions for various system call operations that
|
| 2660 | * read or write files, it does not address the revalidation of permissions for
|
| 2661 | * memory-mapped files. Security modules must handle this separately if they
|
| 2662 | * need such revalidation.
|
| 2663 | *
|
| 2664 | * Return: Returns 0 if permission is granted.
|
| 2665 |
|
| 2666 | int security_file_permission(struct file *file, int mask)
|
| 2667 | {
|
| 2668 | return call_int_hook(file_permission, 0, file, mask);
|
| 2669 | }
|
| 2670 |
|
| 2671 | |
| 2672 | * security_file_alloc() - Allocate and init a file's LSM blob
|
| 2673 | * @file: the file
|
| 2674 | *
|
| 2675 | * Allocate and attach a security structure to the file->f_security field. The
|
| 2676 | * security field is initialized to NULL when the structure is first created.
|
| 2677 | *
|
| 2678 | * Return: Return 0 if the hook is successful and permission is granted.
|
| 2679 |
|
| 2680 | int security_file_alloc(struct file *file)
|
| 2681 | {
|
| 2682 | int rc = lsm_file_alloc(file);
|
| 2683 |
|
| 2684 | if (rc)
|
| 2685 | return rc;
|
| 2686 | rc = call_int_hook(file_alloc_security, 0, file);
|
| 2687 | if (unlikely(rc))
|
| 2688 | security_file_free(file);
|
| 2689 | return rc;
|
| 2690 | }
|
| 2691 |
|
| 2692 | |
| 2693 | * security_file_free() - Free a file's LSM blob
|
| 2694 | * @file: the file
|
| 2695 | *
|
| 2696 | * Deallocate and free any security structures stored in file->f_security.
|
| 2697 |
|
| 2698 | void security_file_free(struct file *file)
|
| 2699 | {
|
| 2700 | void *blob;
|
| 2701 |
|
| 2702 | call_void_hook(file_free_security, file);
|
| 2703 |
|
| 2704 | blob = file->f_security;
|
| 2705 | if (blob) {
|
| 2706 | file->f_security = NULL;
|
| 2707 | kmem_cache_free(lsm_file_cache, blob);
|
| 2708 | }
|
| 2709 | }
|
| 2710 |
|
| 2711 | |
| 2712 | * security_file_ioctl() - Check if an ioctl is allowed
|
| 2713 | * @file: associated file
|
| 2714 | * @cmd: ioctl cmd
|
| 2715 | * @arg: ioctl arguments
|
| 2716 | *
|
| 2717 | * Check permission for an ioctl operation on @file. Note that @arg sometimes
|
| 2718 | * represents a user space pointer; in other cases, it may be a simple integer
|
| 2719 | * value. When @arg represents a user space pointer, it should never be used
|
| 2720 | * by the security module.
|
| 2721 | *
|
| 2722 | * Return: Returns 0 if permission is granted.
|
| 2723 |
|
| 2724 | int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
| 2725 | {
|
| 2726 | return call_int_hook(file_ioctl, 0, file, cmd, arg);
|
| 2727 | }
|
| 2728 | EXPORT_SYMBOL_GPL(security_file_ioctl);
|
| 2729 |
|
| 2730 | |
| 2731 | * security_file_ioctl_compat() - Check if an ioctl is allowed in compat mode
|
| 2732 | * @file: associated file
|
| 2733 | * @cmd: ioctl cmd
|
| 2734 | * @arg: ioctl arguments
|
| 2735 | *
|
| 2736 | * Compat version of security_file_ioctl() that correctly handles 32-bit
|
| 2737 | * processes running on 64-bit kernels.
|
| 2738 | *
|
| 2739 | * Return: Returns 0 if permission is granted.
|
| 2740 |
|
| 2741 | int security_file_ioctl_compat(struct file *file, unsigned int cmd,
|
| 2742 | unsigned long arg)
|
| 2743 | {
|
| 2744 | return call_int_hook(file_ioctl_compat, 0, file, cmd, arg);
|
| 2745 | }
|
| 2746 | EXPORT_SYMBOL_GPL(security_file_ioctl_compat);
|
| 2747 |
|
| 2748 | static inline unsigned long mmap_prot(struct file *file, unsigned long prot)
|
| 2749 | {
|
| 2750 | |
| 2751 | * Does we have PROT_READ and does the application expect
|
| 2752 | * it to imply PROT_EXEC? If not, nothing to talk about...
|
| 2753 |
|
| 2754 | if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ)
|
| 2755 | return prot;
|
| 2756 | if (!(current->personality & READ_IMPLIES_EXEC))
|
| 2757 | return prot;
|
| 2758 | |
| 2759 | * if that's an anonymous mapping, let it.
|
| 2760 |
|
| 2761 | if (!file)
|
| 2762 | return prot | PROT_EXEC;
|
| 2763 | |
| 2764 | * ditto if it's not on noexec mount, except that on !MMU we need
|
| 2765 | * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
|
| 2766 |
|
| 2767 | if (!path_noexec(&file->f_path)) {
|
| 2768 | #ifndef CONFIG_MMU
|
| 2769 | if (file->f_op->mmap_capabilities) {
|
| 2770 | unsigned caps = file->f_op->mmap_capabilities(file);
|
| 2771 | if (!(caps & NOMMU_MAP_EXEC))
|
| 2772 | return prot;
|
| 2773 | }
|
| 2774 | #endif
|
| 2775 | return prot | PROT_EXEC;
|
| 2776 | }
|
| 2777 |
|
| 2778 | return prot;
|
| 2779 | }
|
| 2780 |
|
| 2781 | |
| 2782 | * security_mmap_file() - Check if mmap'ing a file is allowed
|
| 2783 | * @file: file
|
| 2784 | * @prot: protection applied by the kernel
|
| 2785 | * @flags: flags
|
| 2786 | *
|
| 2787 | * Check permissions for a mmap operation. The @file may be NULL, e.g. if
|
| 2788 | * mapping anonymous memory.
|
| 2789 | *
|
| 2790 | * Return: Returns 0 if permission is granted.
|
| 2791 |
|
| 2792 | int security_mmap_file(struct file *file, unsigned long prot,
|
| 2793 | unsigned long flags)
|
| 2794 | {
|
| 2795 | unsigned long prot_adj = mmap_prot(file, prot);
|
| 2796 | int ret;
|
| 2797 |
|
| 2798 | ret = call_int_hook(mmap_file, 0, file, prot, prot_adj, flags);
|
| 2799 | if (ret)
|
| 2800 | return ret;
|
| 2801 | return ima_file_mmap(file, prot, prot_adj, flags);
|
| 2802 | }
|
| 2803 |
|
| 2804 | |
| 2805 | * security_mmap_addr() - Check if mmap'ing an address is allowed
|
| 2806 | * @addr: address
|
| 2807 | *
|
| 2808 | * Check permissions for a mmap operation at @addr.
|
| 2809 | *
|
| 2810 | * Return: Returns 0 if permission is granted.
|
| 2811 |
|
| 2812 | int security_mmap_addr(unsigned long addr)
|
| 2813 | {
|
| 2814 | return call_int_hook(mmap_addr, 0, addr);
|
| 2815 | }
|
| 2816 |
|
| 2817 | |
| 2818 | * security_file_mprotect() - Check if changing memory protections is allowed
|
| 2819 | * @vma: memory region
|
| 2820 | * @reqprot: application requested protection
|
| 2821 | * @prot: protection applied by the kernel
|
| 2822 | *
|
| 2823 | * Check permissions before changing memory access permissions.
|
| 2824 | *
|
| 2825 | * Return: Returns 0 if permission is granted.
|
| 2826 |
|
| 2827 | int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
|
| 2828 | unsigned long prot)
|
| 2829 | {
|
| 2830 | int ret;
|
| 2831 |
|
| 2832 | ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot);
|
| 2833 | if (ret)
|
| 2834 | return ret;
|
| 2835 | return ima_file_mprotect(vma, prot);
|
| 2836 | }
|
| 2837 |
|
| 2838 | |
| 2839 | * security_file_lock() - Check if a file lock is allowed
|
| 2840 | * @file: file
|
| 2841 | * @cmd: lock operation (e.g. F_RDLCK, F_WRLCK)
|
| 2842 | *
|
| 2843 | * Check permission before performing file locking operations. Note the hook
|
| 2844 | * mediates both flock and fcntl style locks.
|
| 2845 | *
|
| 2846 | * Return: Returns 0 if permission is granted.
|
| 2847 |
|
| 2848 | int security_file_lock(struct file *file, unsigned int cmd)
|
| 2849 | {
|
| 2850 | return call_int_hook(file_lock, 0, file, cmd);
|
| 2851 | }
|
| 2852 |
|
| 2853 | |
| 2854 | * security_file_fcntl() - Check if fcntl() op is allowed
|
| 2855 | * @file: file
|
| 2856 | * @cmd: fcntl command
|
| 2857 | * @arg: command argument
|
| 2858 | *
|
| 2859 | * Check permission before allowing the file operation specified by @cmd from
|
| 2860 | * being performed on the file @file. Note that @arg sometimes represents a
|
| 2861 | * user space pointer; in other cases, it may be a simple integer value. When
|
| 2862 | * @arg represents a user space pointer, it should never be used by the
|
| 2863 | * security module.
|
| 2864 | *
|
| 2865 | * Return: Returns 0 if permission is granted.
|
| 2866 |
|
| 2867 | int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
|
| 2868 | {
|
| 2869 | return call_int_hook(file_fcntl, 0, file, cmd, arg);
|
| 2870 | }
|
| 2871 |
|
| 2872 | |
| 2873 | * security_file_set_fowner() - Set the file owner info in the LSM blob
|
| 2874 | * @file: the file
|
| 2875 | *
|
| 2876 | * Save owner security information (typically from current->security) in
|
| 2877 | * file->f_security for later use by the send_sigiotask hook.
|
| 2878 | *
|
| 2879 | * Return: Returns 0 on success.
|
| 2880 |
|
| 2881 | void security_file_set_fowner(struct file *file)
|
| 2882 | {
|
| 2883 | call_void_hook(file_set_fowner, file);
|
| 2884 | }
|
| 2885 |
|
| 2886 | |
| 2887 | * security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed
|
| 2888 | * @tsk: target task
|
| 2889 | * @fown: signal sender
|
| 2890 | * @sig: signal to be sent, SIGIO is sent if 0
|
| 2891 | *
|
| 2892 | * Check permission for the file owner @fown to send SIGIO or SIGURG to the
|
| 2893 | * process @tsk. Note that this hook is sometimes called from interrupt. Note
|
| 2894 | * that the fown_struct, @fown, is never outside the context of a struct file,
|
| 2895 | * so the file structure (and associated security information) can always be
|
| 2896 | * obtained: container_of(fown, struct file, f_owner).
|
| 2897 | *
|
| 2898 | * Return: Returns 0 if permission is granted.
|
| 2899 |
|
| 2900 | int security_file_send_sigiotask(struct task_struct *tsk,
|
| 2901 | struct fown_struct *fown, int sig)
|
| 2902 | {
|
| 2903 | return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig);
|
| 2904 | }
|
| 2905 |
|
| 2906 | |
| 2907 | * security_file_receive() - Check is receiving a file via IPC is allowed
|
| 2908 | * @file: file being received
|
| 2909 | *
|
| 2910 | * This hook allows security modules to control the ability of a process to
|
| 2911 | * receive an open file descriptor via socket IPC.
|
| 2912 | *
|
| 2913 | * Return: Returns 0 if permission is granted.
|
| 2914 |
|
| 2915 | int security_file_receive(struct file *file)
|
| 2916 | {
|
| 2917 | return call_int_hook(file_receive, 0, file);
|
| 2918 | }
|
| 2919 |
|
| 2920 | |
| 2921 | * security_file_open() - Save open() time state for late use by the LSM
|
| 2922 | * @file:
|
| 2923 | *
|
| 2924 | * Save open-time permission checking state for later use upon file_permission,
|
| 2925 | * and recheck access if anything has changed since inode_permission.
|
| 2926 | *
|
| 2927 | * Return: Returns 0 if permission is granted.
|
| 2928 |
|
| 2929 | int security_file_open(struct file *file)
|
| 2930 | {
|
| 2931 | int ret;
|
| 2932 |
|
| 2933 | ret = call_int_hook(file_open, 0, file);
|
| 2934 | if (ret)
|
| 2935 | return ret;
|
| 2936 |
|
| 2937 | return fsnotify_open_perm(file);
|
| 2938 | }
|
| 2939 |
|
| 2940 | |
| 2941 | * security_file_truncate() - Check if truncating a file is allowed
|
| 2942 | * @file: file
|
| 2943 | *
|
| 2944 | * Check permission before truncating a file, i.e. using ftruncate. Note that
|
| 2945 | * truncation permission may also be checked based on the path, using the
|
| 2946 | * @path_truncate hook.
|
| 2947 | *
|
| 2948 | * Return: Returns 0 if permission is granted.
|
| 2949 |
|
| 2950 | int security_file_truncate(struct file *file)
|
| 2951 | {
|
| 2952 | return call_int_hook(file_truncate, 0, file);
|
| 2953 | }
|
| 2954 |
|
| 2955 | |
| 2956 | * security_task_alloc() - Allocate a task's LSM blob
|
| 2957 | * @task: the task
|
| 2958 | * @clone_flags: flags indicating what is being shared
|
| 2959 | *
|
| 2960 | * Handle allocation of task-related resources.
|
| 2961 | *
|
| 2962 | * Return: Returns a zero on success, negative values on failure.
|
| 2963 |
|
| 2964 | int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
|
| 2965 | {
|
| 2966 | int rc = lsm_task_alloc(task);
|
| 2967 |
|
| 2968 | if (rc)
|
| 2969 | return rc;
|
| 2970 | rc = call_int_hook(task_alloc, 0, task, clone_flags);
|
| 2971 | if (unlikely(rc))
|
| 2972 | security_task_free(task);
|
| 2973 | return rc;
|
| 2974 | }
|
| 2975 |
|
| 2976 | |
| 2977 | * security_task_free() - Free a task's LSM blob and related resources
|
| 2978 | * @task: task
|
| 2979 | *
|
| 2980 | * Handle release of task-related resources. Note that this can be called from
|
| 2981 | * interrupt context.
|
| 2982 |
|
| 2983 | void security_task_free(struct task_struct *task)
|
| 2984 | {
|
| 2985 | call_void_hook(task_free, task);
|
| 2986 |
|
| 2987 | kfree(task->security);
|
| 2988 | task->security = NULL;
|
| 2989 | }
|
| 2990 |
|
| 2991 | |
| 2992 | * security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer
|
| 2993 | * @cred: credentials
|
| 2994 | * @gfp: gfp flags
|
| 2995 | *
|
| 2996 | * Only allocate sufficient memory and attach to @cred such that
|
| 2997 | * cred_transfer() will not get ENOMEM.
|
| 2998 | *
|
| 2999 | * Return: Returns 0 on success, negative values on failure.
|
| 3000 |
|
| 3001 | int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
|
| 3002 | {
|
| 3003 | int rc = lsm_cred_alloc(cred, gfp);
|
| 3004 |
|
| 3005 | if (rc)
|
| 3006 | return rc;
|
| 3007 |
|
| 3008 | rc = call_int_hook(cred_alloc_blank, 0, cred, gfp);
|
| 3009 | if (unlikely(rc))
|
| 3010 | security_cred_free(cred);
|
| 3011 | return rc;
|
| 3012 | }
|
| 3013 |
|
| 3014 | |
| 3015 | * security_cred_free() - Free the cred's LSM blob and associated resources
|
| 3016 | * @cred: credentials
|
| 3017 | *
|
| 3018 | * Deallocate and clear the cred->security field in a set of credentials.
|
| 3019 |
|
| 3020 | void security_cred_free(struct cred *cred)
|
| 3021 | {
|
| 3022 | |
| 3023 | * There is a failure case in prepare_creds() that
|
| 3024 | * may result in a call here with ->security being NULL.
|
| 3025 |
|
| 3026 | if (unlikely(cred->security == NULL))
|
| 3027 | return;
|
| 3028 |
|
| 3029 | call_void_hook(cred_free, cred);
|
| 3030 |
|
| 3031 | kfree(cred->security);
|
| 3032 | cred->security = NULL;
|
| 3033 | }
|
| 3034 |
|
| 3035 | |
| 3036 | * security_prepare_creds() - Prepare a new set of credentials
|
| 3037 | * @new: new credentials
|
| 3038 | * @old: original credentials
|
| 3039 | * @gfp: gfp flags
|
| 3040 | *
|
| 3041 | * Prepare a new set of credentials by copying the data from the old set.
|
| 3042 | *
|
| 3043 | * Return: Returns 0 on success, negative values on failure.
|
| 3044 |
|
| 3045 | int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
|
| 3046 | {
|
| 3047 | int rc = lsm_cred_alloc(new, gfp);
|
| 3048 |
|
| 3049 | if (rc)
|
| 3050 | return rc;
|
| 3051 |
|
| 3052 | rc = call_int_hook(cred_prepare, 0, new, old, gfp);
|
| 3053 | if (unlikely(rc))
|
| 3054 | security_cred_free(new);
|
| 3055 | return rc;
|
| 3056 | }
|
| 3057 |
|
| 3058 | |
| 3059 | * security_transfer_creds() - Transfer creds
|
| 3060 | * @new: target credentials
|
| 3061 | * @old: original credentials
|
| 3062 | *
|
| 3063 | * Transfer data from original creds to new creds.
|
| 3064 |
|
| 3065 | void security_transfer_creds(struct cred *new, const struct cred *old)
|
| 3066 | {
|
| 3067 | call_void_hook(cred_transfer, new, old);
|
| 3068 | }
|
| 3069 |
|
| 3070 | |
| 3071 | * security_cred_getsecid() - Get the secid from a set of credentials
|
| 3072 | * @c: credentials
|
| 3073 | * @secid: secid value
|
| 3074 | *
|
| 3075 | * Retrieve the security identifier of the cred structure @c. In case of
|
| 3076 | * failure, @secid will be set to zero.
|
| 3077 |
|
| 3078 | void security_cred_getsecid(const struct cred *c, u32 *secid)
|
| 3079 | {
|
| 3080 | *secid = 0;
|
| 3081 | call_void_hook(cred_getsecid, c, secid);
|
| 3082 | }
|
| 3083 | EXPORT_SYMBOL(security_cred_getsecid);
|
| 3084 |
|
| 3085 | |
| 3086 | * security_kernel_act_as() - Set the kernel credentials to act as secid
|
| 3087 | * @new: credentials
|
| 3088 | * @secid: secid
|
| 3089 | *
|
| 3090 | * Set the credentials for a kernel service to act as (subjective context).
|
| 3091 | * The current task must be the one that nominated @secid.
|
| 3092 | *
|
| 3093 | * Return: Returns 0 if successful.
|
| 3094 |
|
| 3095 | int security_kernel_act_as(struct cred *new, u32 secid)
|
| 3096 | {
|
| 3097 | return call_int_hook(kernel_act_as, 0, new, secid);
|
| 3098 | }
|
| 3099 |
|
| 3100 | |
| 3101 | * security_kernel_create_files_as() - Set file creation context using an inode
|
| 3102 | * @new: target credentials
|
| 3103 | * @inode: reference inode
|
| 3104 | *
|
| 3105 | * Set the file creation context in a set of credentials to be the same as the
|
| 3106 | * objective context of the specified inode. The current task must be the one
|
| 3107 | * that nominated @inode.
|
| 3108 | *
|
| 3109 | * Return: Returns 0 if successful.
|
| 3110 |
|
| 3111 | int security_kernel_create_files_as(struct cred *new, struct inode *inode)
|
| 3112 | {
|
| 3113 | return call_int_hook(kernel_create_files_as, 0, new, inode);
|
| 3114 | }
|
| 3115 |
|
| 3116 | |
| 3117 | * security_kernel_module_request() - Check is loading a module is allowed
|
| 3118 | * @kmod_name: module name
|
| 3119 | *
|
| 3120 | * Ability to trigger the kernel to automatically upcall to userspace for
|
| 3121 | * userspace to load a kernel module with the given name.
|
| 3122 | *
|
| 3123 | * Return: Returns 0 if successful.
|
| 3124 |
|
| 3125 | int security_kernel_module_request(char *kmod_name)
|
| 3126 | {
|
| 3127 | int ret;
|
| 3128 |
|
| 3129 | ret = call_int_hook(kernel_module_request, 0, kmod_name);
|
| 3130 | if (ret)
|
| 3131 | return ret;
|
| 3132 | return integrity_kernel_module_request(kmod_name);
|
| 3133 | }
|
| 3134 |
|
| 3135 | |
| 3136 | * security_kernel_read_file() - Read a file specified by userspace
|
| 3137 | * @file: file
|
| 3138 | * @id: file identifier
|
| 3139 | * @contents: trust if security_kernel_post_read_file() will be called
|
| 3140 | *
|
| 3141 | * Read a file specified by userspace.
|
| 3142 | *
|
| 3143 | * Return: Returns 0 if permission is granted.
|
| 3144 |
|
| 3145 | int security_kernel_read_file(struct file *file, enum kernel_read_file_id id,
|
| 3146 | bool contents)
|
| 3147 | {
|
| 3148 | int ret;
|
| 3149 |
|
| 3150 | ret = call_int_hook(kernel_read_file, 0, file, id, contents);
|
| 3151 | if (ret)
|
| 3152 | return ret;
|
| 3153 | return ima_read_file(file, id, contents);
|
| 3154 | }
|
| 3155 | EXPORT_SYMBOL_GPL(security_kernel_read_file);
|
| 3156 |
|
| 3157 | |
| 3158 | * security_kernel_post_read_file() - Read a file specified by userspace
|
| 3159 | * @file: file
|
| 3160 | * @buf: file contents
|
| 3161 | * @size: size of file contents
|
| 3162 | * @id: file identifier
|
| 3163 | *
|
| 3164 | * Read a file specified by userspace. This must be paired with a prior call
|
| 3165 | * to security_kernel_read_file() call that indicated this hook would also be
|
| 3166 | * called, see security_kernel_read_file() for more information.
|
| 3167 | *
|
| 3168 | * Return: Returns 0 if permission is granted.
|
| 3169 |
|
| 3170 | int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
|
| 3171 | enum kernel_read_file_id id)
|
| 3172 | {
|
| 3173 | int ret;
|
| 3174 |
|
| 3175 | ret = call_int_hook(kernel_post_read_file, 0, file, buf, size, id);
|
| 3176 | if (ret)
|
| 3177 | return ret;
|
| 3178 | return ima_post_read_file(file, buf, size, id);
|
| 3179 | }
|
| 3180 | EXPORT_SYMBOL_GPL(security_kernel_post_read_file);
|
| 3181 |
|
| 3182 | |
| 3183 | * security_kernel_load_data() - Load data provided by userspace
|
| 3184 | * @id: data identifier
|
| 3185 | * @contents: true if security_kernel_post_load_data() will be called
|
| 3186 | *
|
| 3187 | * Load data provided by userspace.
|
| 3188 | *
|
| 3189 | * Return: Returns 0 if permission is granted.
|
| 3190 |
|
| 3191 | int security_kernel_load_data(enum kernel_load_data_id id, bool contents)
|
| 3192 | {
|
| 3193 | int ret;
|
| 3194 |
|
| 3195 | ret = call_int_hook(kernel_load_data, 0, id, contents);
|
| 3196 | if (ret)
|
| 3197 | return ret;
|
| 3198 | return ima_load_data(id, contents);
|
| 3199 | }
|
| 3200 | EXPORT_SYMBOL_GPL(security_kernel_load_data);
|
| 3201 |
|
| 3202 | |
| 3203 | * security_kernel_post_load_data() - Load userspace data from a non-file source
|
| 3204 | * @buf: data
|
| 3205 | * @size: size of data
|
| 3206 | * @id: data identifier
|
| 3207 | * @description: text description of data, specific to the id value
|
| 3208 | *
|
| 3209 | * Load data provided by a non-file source (usually userspace buffer). This
|
| 3210 | * must be paired with a prior security_kernel_load_data() call that indicated
|
| 3211 | * this hook would also be called, see security_kernel_load_data() for more
|
| 3212 | * information.
|
| 3213 | *
|
| 3214 | * Return: Returns 0 if permission is granted.
|
| 3215 |
|
| 3216 | int security_kernel_post_load_data(char *buf, loff_t size,
|
| 3217 | enum kernel_load_data_id id,
|
| 3218 | char *description)
|
| 3219 | {
|
| 3220 | int ret;
|
| 3221 |
|
| 3222 | ret = call_int_hook(kernel_post_load_data, 0, buf, size, id,
|
| 3223 | description);
|
| 3224 | if (ret)
|
| 3225 | return ret;
|
| 3226 | return ima_post_load_data(buf, size, id, description);
|
| 3227 | }
|
| 3228 | EXPORT_SYMBOL_GPL(security_kernel_post_load_data);
|
| 3229 |
|
| 3230 | |
| 3231 | * security_task_fix_setuid() - Update LSM with new user id attributes
|
| 3232 | * @new: updated credentials
|
| 3233 | * @old: credentials being replaced
|
| 3234 | * @flags: LSM_SETID_* flag values
|
| 3235 | *
|
| 3236 | * Update the module's state after setting one or more of the user identity
|
| 3237 | * attributes of the current process. The @flags parameter indicates which of
|
| 3238 | * the set*uid system calls invoked this hook. If @new is the set of
|
| 3239 | * credentials that will be installed. Modifications should be made to this
|
| 3240 | * rather than to @current->cred.
|
| 3241 | *
|
| 3242 | * Return: Returns 0 on success.
|
| 3243 |
|
| 3244 | int security_task_fix_setuid(struct cred *new, const struct cred *old,
|
| 3245 | int flags)
|
| 3246 | {
|
| 3247 | return call_int_hook(task_fix_setuid, 0, new, old, flags);
|
| 3248 | }
|
| 3249 |
|
| 3250 | |
| 3251 | * security_task_fix_setgid() - Update LSM with new group id attributes
|
| 3252 | * @new: updated credentials
|
| 3253 | * @old: credentials being replaced
|
| 3254 | * @flags: LSM_SETID_* flag value
|
| 3255 | *
|
| 3256 | * Update the module's state after setting one or more of the group identity
|
| 3257 | * attributes of the current process. The @flags parameter indicates which of
|
| 3258 | * the set*gid system calls invoked this hook. @new is the set of credentials
|
| 3259 | * that will be installed. Modifications should be made to this rather than to
|
| 3260 | * @current->cred.
|
| 3261 | *
|
| 3262 | * Return: Returns 0 on success.
|
| 3263 |
|
| 3264 | int security_task_fix_setgid(struct cred *new, const struct cred *old,
|
| 3265 | int flags)
|
| 3266 | {
|
| 3267 | return call_int_hook(task_fix_setgid, 0, new, old, flags);
|
| 3268 | }
|
| 3269 |
|
| 3270 | |
| 3271 | * security_task_fix_setgroups() - Update LSM with new supplementary groups
|
| 3272 | * @new: updated credentials
|
| 3273 | * @old: credentials being replaced
|
| 3274 | *
|
| 3275 | * Update the module's state after setting the supplementary group identity
|
| 3276 | * attributes of the current process. @new is the set of credentials that will
|
| 3277 | * be installed. Modifications should be made to this rather than to
|
| 3278 | * @current->cred.
|
| 3279 | *
|
| 3280 | * Return: Returns 0 on success.
|
| 3281 |
|
| 3282 | int security_task_fix_setgroups(struct cred *new, const struct cred *old)
|
| 3283 | {
|
| 3284 | return call_int_hook(task_fix_setgroups, 0, new, old);
|
| 3285 | }
|
| 3286 |
|
| 3287 | |
| 3288 | * security_task_setpgid() - Check if setting the pgid is allowed
|
| 3289 | * @p: task being modified
|
| 3290 | * @pgid: new pgid
|
| 3291 | *
|
| 3292 | * Check permission before setting the process group identifier of the process
|
| 3293 | * @p to @pgid.
|
| 3294 | *
|
| 3295 | * Return: Returns 0 if permission is granted.
|
| 3296 |
|
| 3297 | int security_task_setpgid(struct task_struct *p, pid_t pgid)
|
| 3298 | {
|
| 3299 | return call_int_hook(task_setpgid, 0, p, pgid);
|
| 3300 | }
|
| 3301 |
|
| 3302 | |
| 3303 | * security_task_getpgid() - Check if getting the pgid is allowed
|
| 3304 | * @p: task
|
| 3305 | *
|
| 3306 | * Check permission before getting the process group identifier of the process
|
| 3307 | * @p.
|
| 3308 | *
|
| 3309 | * Return: Returns 0 if permission is granted.
|
| 3310 |
|
| 3311 | int security_task_getpgid(struct task_struct *p)
|
| 3312 | {
|
| 3313 | return call_int_hook(task_getpgid, 0, p);
|
| 3314 | }
|
| 3315 |
|
| 3316 | |
| 3317 | * security_task_getsid() - Check if getting the session id is allowed
|
| 3318 | * @p: task
|
| 3319 | *
|
| 3320 | * Check permission before getting the session identifier of the process @p.
|
| 3321 | *
|
| 3322 | * Return: Returns 0 if permission is granted.
|
| 3323 |
|
| 3324 | int security_task_getsid(struct task_struct *p)
|
| 3325 | {
|
| 3326 | return call_int_hook(task_getsid, 0, p);
|
| 3327 | }
|
| 3328 |
|
| 3329 | |
| 3330 | * security_current_getsecid_subj() - Get the current task's subjective secid
|
| 3331 | * @secid: secid value
|
| 3332 | *
|
| 3333 | * Retrieve the subjective security identifier of the current task and return
|
| 3334 | * it in @secid. In case of failure, @secid will be set to zero.
|
| 3335 |
|
| 3336 | void security_current_getsecid_subj(u32 *secid)
|
| 3337 | {
|
| 3338 | *secid = 0;
|
| 3339 | call_void_hook(current_getsecid_subj, secid);
|
| 3340 | }
|
| 3341 | EXPORT_SYMBOL(security_current_getsecid_subj);
|
| 3342 |
|
| 3343 | |
| 3344 | * security_task_getsecid_obj() - Get a task's objective secid
|
| 3345 | * @p: target task
|
| 3346 | * @secid: secid value
|
| 3347 | *
|
| 3348 | * Retrieve the objective security identifier of the task_struct in @p and
|
| 3349 | * return it in @secid. In case of failure, @secid will be set to zero.
|
| 3350 |
|
| 3351 | void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
|
| 3352 | {
|
| 3353 | *secid = 0;
|
| 3354 | call_void_hook(task_getsecid_obj, p, secid);
|
| 3355 | }
|
| 3356 | EXPORT_SYMBOL(security_task_getsecid_obj);
|
| 3357 |
|
| 3358 | |
| 3359 | * security_task_setnice() - Check if setting a task's nice value is allowed
|
| 3360 | * @p: target task
|
| 3361 | * @nice: nice value
|
| 3362 | *
|
| 3363 | * Check permission before setting the nice value of @p to @nice.
|
| 3364 | *
|
| 3365 | * Return: Returns 0 if permission is granted.
|
| 3366 |
|
| 3367 | int security_task_setnice(struct task_struct *p, int nice)
|
| 3368 | {
|
| 3369 | return call_int_hook(task_setnice, 0, p, nice);
|
| 3370 | }
|
| 3371 |
|
| 3372 | |
| 3373 | * security_task_setioprio() - Check if setting a task's ioprio is allowed
|
| 3374 | * @p: target task
|
| 3375 | * @ioprio: ioprio value
|
| 3376 | *
|
| 3377 | * Check permission before setting the ioprio value of @p to @ioprio.
|
| 3378 | *
|
| 3379 | * Return: Returns 0 if permission is granted.
|
| 3380 |
|
| 3381 | int security_task_setioprio(struct task_struct *p, int ioprio)
|
| 3382 | {
|
| 3383 | return call_int_hook(task_setioprio, 0, p, ioprio);
|
| 3384 | }
|
| 3385 |
|
| 3386 | |
| 3387 | * security_task_getioprio() - Check if getting a task's ioprio is allowed
|
| 3388 | * @p: task
|
| 3389 | *
|
| 3390 | * Check permission before getting the ioprio value of @p.
|
| 3391 | *
|
| 3392 | * Return: Returns 0 if permission is granted.
|
| 3393 |
|
| 3394 | int security_task_getioprio(struct task_struct *p)
|
| 3395 | {
|
| 3396 | return call_int_hook(task_getioprio, 0, p);
|
| 3397 | }
|
| 3398 |
|
| 3399 | |
| 3400 | * security_task_prlimit() - Check if get/setting resources limits is allowed
|
| 3401 | * @cred: current task credentials
|
| 3402 | * @tcred: target task credentials
|
| 3403 | * @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both
|
| 3404 | *
|
| 3405 | * Check permission before getting and/or setting the resource limits of
|
| 3406 | * another task.
|
| 3407 | *
|
| 3408 | * Return: Returns 0 if permission is granted.
|
| 3409 |
|
| 3410 | int security_task_prlimit(const struct cred *cred, const struct cred *tcred,
|
| 3411 | unsigned int flags)
|
| 3412 | {
|
| 3413 | return call_int_hook(task_prlimit, 0, cred, tcred, flags);
|
| 3414 | }
|
| 3415 |
|
| 3416 | |
| 3417 | * security_task_setrlimit() - Check if setting a new rlimit value is allowed
|
| 3418 | * @p: target task's group leader
|
| 3419 | * @resource: resource whose limit is being set
|
| 3420 | * @new_rlim: new resource limit
|
| 3421 | *
|
| 3422 | * Check permission before setting the resource limits of process @p for
|
| 3423 | * @resource to @new_rlim. The old resource limit values can be examined by
|
| 3424 | * dereferencing (p->signal->rlim + resource).
|
| 3425 | *
|
| 3426 | * Return: Returns 0 if permission is granted.
|
| 3427 |
|
| 3428 | int security_task_setrlimit(struct task_struct *p, unsigned int resource,
|
| 3429 | struct rlimit *new_rlim)
|
| 3430 | {
|
| 3431 | return call_int_hook(task_setrlimit, 0, p, resource, new_rlim);
|
| 3432 | }
|
| 3433 |
|
| 3434 | |
| 3435 | * security_task_setscheduler() - Check if setting sched policy/param is allowed
|
| 3436 | * @p: target task
|
| 3437 | *
|
| 3438 | * Check permission before setting scheduling policy and/or parameters of
|
| 3439 | * process @p.
|
| 3440 | *
|
| 3441 | * Return: Returns 0 if permission is granted.
|
| 3442 |
|
| 3443 | int security_task_setscheduler(struct task_struct *p)
|
| 3444 | {
|
| 3445 | return call_int_hook(task_setscheduler, 0, p);
|
| 3446 | }
|
| 3447 |
|
| 3448 | |
| 3449 | * security_task_getscheduler() - Check if getting scheduling info is allowed
|
| 3450 | * @p: target task
|
| 3451 | *
|
| 3452 | * Check permission before obtaining scheduling information for process @p.
|
| 3453 | *
|
| 3454 | * Return: Returns 0 if permission is granted.
|
| 3455 |
|
| 3456 | int security_task_getscheduler(struct task_struct *p)
|
| 3457 | {
|
| 3458 | return call_int_hook(task_getscheduler, 0, p);
|
| 3459 | }
|
| 3460 |
|
| 3461 | |
| 3462 | * security_task_movememory() - Check if moving memory is allowed
|
| 3463 | * @p: task
|
| 3464 | *
|
| 3465 | * Check permission before moving memory owned by process @p.
|
| 3466 | *
|
| 3467 | * Return: Returns 0 if permission is granted.
|
| 3468 |
|
| 3469 | int security_task_movememory(struct task_struct *p)
|
| 3470 | {
|
| 3471 | return call_int_hook(task_movememory, 0, p);
|
| 3472 | }
|
| 3473 |
|
| 3474 | |
| 3475 | * security_task_kill() - Check if sending a signal is allowed
|
| 3476 | * @p: target process
|
| 3477 | * @info: signal information
|
| 3478 | * @sig: signal value
|
| 3479 | * @cred: credentials of the signal sender, NULL if @current
|
| 3480 | *
|
| 3481 | * Check permission before sending signal @sig to @p. @info can be NULL, the
|
| 3482 | * constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or
|
| 3483 | * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from
|
| 3484 | * the kernel and should typically be permitted. SIGIO signals are handled
|
| 3485 | * separately by the send_sigiotask hook in file_security_ops.
|
| 3486 | *
|
| 3487 | * Return: Returns 0 if permission is granted.
|
| 3488 |
|
| 3489 | int security_task_kill(struct task_struct *p, struct kernel_siginfo *info,
|
| 3490 | int sig, const struct cred *cred)
|
| 3491 | {
|
| 3492 | return call_int_hook(task_kill, 0, p, info, sig, cred);
|
| 3493 | }
|
| 3494 |
|
| 3495 | |
| 3496 | * security_task_prctl() - Check if a prctl op is allowed
|
| 3497 | * @option: operation
|
| 3498 | * @arg2: argument
|
| 3499 | * @arg3: argument
|
| 3500 | * @arg4: argument
|
| 3501 | * @arg5: argument
|
| 3502 | *
|
| 3503 | * Check permission before performing a process control operation on the
|
| 3504 | * current process.
|
| 3505 | *
|
| 3506 | * Return: Return -ENOSYS if no-one wanted to handle this op, any other value
|
| 3507 | * to cause prctl() to return immediately with that value.
|
| 3508 |
|
| 3509 | int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
|
| 3510 | unsigned long arg4, unsigned long arg5)
|
| 3511 | {
|
| 3512 | int thisrc;
|
| 3513 | int rc = LSM_RET_DEFAULT(task_prctl);
|
| 3514 | struct security_hook_list *hp;
|
| 3515 |
|
| 3516 | hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
|
| 3517 | thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
|
| 3518 | if (thisrc != LSM_RET_DEFAULT(task_prctl)) {
|
| 3519 | rc = thisrc;
|
| 3520 | if (thisrc != 0)
|
| 3521 | break;
|
| 3522 | }
|
| 3523 | }
|
| 3524 | return rc;
|
| 3525 | }
|
| 3526 |
|
| 3527 | |
| 3528 | * security_task_to_inode() - Set the security attributes of a task's inode
|
| 3529 | * @p: task
|
| 3530 | * @inode: inode
|
| 3531 | *
|
| 3532 | * Set the security attributes for an inode based on an associated task's
|
| 3533 | * security attributes, e.g. for /proc/pid inodes.
|
| 3534 |
|
| 3535 | void security_task_to_inode(struct task_struct *p, struct inode *inode)
|
| 3536 | {
|
| 3537 | call_void_hook(task_to_inode, p, inode);
|
| 3538 | }
|
| 3539 |
|
| 3540 | |
| 3541 | * security_create_user_ns() - Check if creating a new userns is allowed
|
| 3542 | * @cred: prepared creds
|
| 3543 | *
|
| 3544 | * Check permission prior to creating a new user namespace.
|
| 3545 | *
|
| 3546 | * Return: Returns 0 if successful, otherwise < 0 error code.
|
| 3547 |
|
| 3548 | int security_create_user_ns(const struct cred *cred)
|
| 3549 | {
|
| 3550 | return call_int_hook(userns_create, 0, cred);
|
| 3551 | }
|
| 3552 |
|
| 3553 | |
| 3554 | * security_ipc_permission() - Check if sysv ipc access is allowed
|
| 3555 | * @ipcp: ipc permission structure
|
| 3556 | * @flag: requested permissions
|
| 3557 | *
|
| 3558 | * Check permissions for access to IPC.
|
| 3559 | *
|
| 3560 | * Return: Returns 0 if permission is granted.
|
| 3561 |
|
| 3562 | int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
|
| 3563 | {
|
| 3564 | return call_int_hook(ipc_permission, 0, ipcp, flag);
|
| 3565 | }
|
| 3566 |
|
| 3567 | |
| 3568 | * security_ipc_getsecid() - Get the sysv ipc object's secid
|
| 3569 | * @ipcp: ipc permission structure
|
| 3570 | * @secid: secid pointer
|
| 3571 | *
|
| 3572 | * Get the secid associated with the ipc object. In case of failure, @secid
|
| 3573 | * will be set to zero.
|
| 3574 |
|
| 3575 | void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
|
| 3576 | {
|
| 3577 | *secid = 0;
|
| 3578 | call_void_hook(ipc_getsecid, ipcp, secid);
|
| 3579 | }
|
| 3580 |
|
| 3581 | |
| 3582 | * security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob
|
| 3583 | * @msg: message structure
|
| 3584 | *
|
| 3585 | * Allocate and attach a security structure to the msg->security field. The
|
| 3586 | * security field is initialized to NULL when the structure is first created.
|
| 3587 | *
|
| 3588 | * Return: Return 0 if operation was successful and permission is granted.
|
| 3589 |
|
| 3590 | int security_msg_msg_alloc(struct msg_msg *msg)
|
| 3591 | {
|
| 3592 | int rc = lsm_msg_msg_alloc(msg);
|
| 3593 |
|
| 3594 | if (unlikely(rc))
|
| 3595 | return rc;
|
| 3596 | rc = call_int_hook(msg_msg_alloc_security, 0, msg);
|
| 3597 | if (unlikely(rc))
|
| 3598 | security_msg_msg_free(msg);
|
| 3599 | return rc;
|
| 3600 | }
|
| 3601 |
|
| 3602 | |
| 3603 | * security_msg_msg_free() - Free a sysv ipc message LSM blob
|
| 3604 | * @msg: message structure
|
| 3605 | *
|
| 3606 | * Deallocate the security structure for this message.
|
| 3607 |
|
| 3608 | void security_msg_msg_free(struct msg_msg *msg)
|
| 3609 | {
|
| 3610 | call_void_hook(msg_msg_free_security, msg);
|
| 3611 | kfree(msg->security);
|
| 3612 | msg->security = NULL;
|
| 3613 | }
|
| 3614 |
|
| 3615 | |
| 3616 | * security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob
|
| 3617 | * @msq: sysv ipc permission structure
|
| 3618 | *
|
| 3619 | * Allocate and attach a security structure to @msg. The security field is
|
| 3620 | * initialized to NULL when the structure is first created.
|
| 3621 | *
|
| 3622 | * Return: Returns 0 if operation was successful and permission is granted.
|
| 3623 |
|
| 3624 | int security_msg_queue_alloc(struct kern_ipc_perm *msq)
|
| 3625 | {
|
| 3626 | int rc = lsm_ipc_alloc(msq);
|
| 3627 |
|
| 3628 | if (unlikely(rc))
|
| 3629 | return rc;
|
| 3630 | rc = call_int_hook(msg_queue_alloc_security, 0, msq);
|
| 3631 | if (unlikely(rc))
|
| 3632 | security_msg_queue_free(msq);
|
| 3633 | return rc;
|
| 3634 | }
|
| 3635 |
|
| 3636 | |
| 3637 | * security_msg_queue_free() - Free a sysv ipc msg queue LSM blob
|
| 3638 | * @msq: sysv ipc permission structure
|
| 3639 | *
|
| 3640 | * Deallocate security field @perm->security for the message queue.
|
| 3641 |
|
| 3642 | void security_msg_queue_free(struct kern_ipc_perm *msq)
|
| 3643 | {
|
| 3644 | call_void_hook(msg_queue_free_security, msq);
|
| 3645 | kfree(msq->security);
|
| 3646 | msq->security = NULL;
|
| 3647 | }
|
| 3648 |
|
| 3649 | |
| 3650 | * security_msg_queue_associate() - Check if a msg queue operation is allowed
|
| 3651 | * @msq: sysv ipc permission structure
|
| 3652 | * @msqflg: operation flags
|
| 3653 | *
|
| 3654 | * Check permission when a message queue is requested through the msgget system
|
| 3655 | * call. This hook is only called when returning the message queue identifier
|
| 3656 | * for an existing message queue, not when a new message queue is created.
|
| 3657 | *
|
| 3658 | * Return: Return 0 if permission is granted.
|
| 3659 |
|
| 3660 | int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
|
| 3661 | {
|
| 3662 | return call_int_hook(msg_queue_associate, 0, msq, msqflg);
|
| 3663 | }
|
| 3664 |
|
| 3665 | |
| 3666 | * security_msg_queue_msgctl() - Check if a msg queue operation is allowed
|
| 3667 | * @msq: sysv ipc permission structure
|
| 3668 | * @cmd: operation
|
| 3669 | *
|
| 3670 | * Check permission when a message control operation specified by @cmd is to be
|
| 3671 | * performed on the message queue with permissions.
|
| 3672 | *
|
| 3673 | * Return: Returns 0 if permission is granted.
|
| 3674 |
|
| 3675 | int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
|
| 3676 | {
|
| 3677 | return call_int_hook(msg_queue_msgctl, 0, msq, cmd);
|
| 3678 | }
|
| 3679 |
|
| 3680 | |
| 3681 | * security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed
|
| 3682 | * @msq: sysv ipc permission structure
|
| 3683 | * @msg: message
|
| 3684 | * @msqflg: operation flags
|
| 3685 | *
|
| 3686 | * Check permission before a message, @msg, is enqueued on the message queue
|
| 3687 | * with permissions specified in @msq.
|
| 3688 | *
|
| 3689 | * Return: Returns 0 if permission is granted.
|
| 3690 |
|
| 3691 | int security_msg_queue_msgsnd(struct kern_ipc_perm *msq,
|
| 3692 | struct msg_msg *msg, int msqflg)
|
| 3693 | {
|
| 3694 | return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg);
|
| 3695 | }
|
| 3696 |
|
| 3697 | |
| 3698 | * security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed
|
| 3699 | * @msq: sysv ipc permission structure
|
| 3700 | * @msg: message
|
| 3701 | * @target: target task
|
| 3702 | * @type: type of message requested
|
| 3703 | * @mode: operation flags
|
| 3704 | *
|
| 3705 | * Check permission before a message, @msg, is removed from the message queue.
|
| 3706 | * The @target task structure contains a pointer to the process that will be
|
| 3707 | * receiving the message (not equal to the current process when inline receives
|
| 3708 | * are being performed).
|
| 3709 | *
|
| 3710 | * Return: Returns 0 if permission is granted.
|
| 3711 |
|
| 3712 | int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
|
| 3713 | struct task_struct *target, long type, int mode)
|
| 3714 | {
|
| 3715 | return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode);
|
| 3716 | }
|
| 3717 |
|
| 3718 | |
| 3719 | * security_shm_alloc() - Allocate a sysv shm LSM blob
|
| 3720 | * @shp: sysv ipc permission structure
|
| 3721 | *
|
| 3722 | * Allocate and attach a security structure to the @shp security field. The
|
| 3723 | * security field is initialized to NULL when the structure is first created.
|
| 3724 | *
|
| 3725 | * Return: Returns 0 if operation was successful and permission is granted.
|
| 3726 |
|
| 3727 | int security_shm_alloc(struct kern_ipc_perm *shp)
|
| 3728 | {
|
| 3729 | int rc = lsm_ipc_alloc(shp);
|
| 3730 |
|
| 3731 | if (unlikely(rc))
|
| 3732 | return rc;
|
| 3733 | rc = call_int_hook(shm_alloc_security, 0, shp);
|
| 3734 | if (unlikely(rc))
|
| 3735 | security_shm_free(shp);
|
| 3736 | return rc;
|
| 3737 | }
|
| 3738 |
|
| 3739 | |
| 3740 | * security_shm_free() - Free a sysv shm LSM blob
|
| 3741 | * @shp: sysv ipc permission structure
|
| 3742 | *
|
| 3743 | * Deallocate the security structure @perm->security for the memory segment.
|
| 3744 |
|
| 3745 | void security_shm_free(struct kern_ipc_perm *shp)
|
| 3746 | {
|
| 3747 | call_void_hook(shm_free_security, shp);
|
| 3748 | kfree(shp->security);
|
| 3749 | shp->security = NULL;
|
| 3750 | }
|
| 3751 |
|
| 3752 | |
| 3753 | * security_shm_associate() - Check if a sysv shm operation is allowed
|
| 3754 | * @shp: sysv ipc permission structure
|
| 3755 | * @shmflg: operation flags
|
| 3756 | *
|
| 3757 | * Check permission when a shared memory region is requested through the shmget
|
| 3758 | * system call. This hook is only called when returning the shared memory
|
| 3759 | * region identifier for an existing region, not when a new shared memory
|
| 3760 | * region is created.
|
| 3761 | *
|
| 3762 | * Return: Returns 0 if permission is granted.
|
| 3763 |
|
| 3764 | int security_shm_associate(struct kern_ipc_perm *shp, int shmflg)
|
| 3765 | {
|
| 3766 | return call_int_hook(shm_associate, 0, shp, shmflg);
|
| 3767 | }
|
| 3768 |
|
| 3769 | |
| 3770 | * security_shm_shmctl() - Check if a sysv shm operation is allowed
|
| 3771 | * @shp: sysv ipc permission structure
|
| 3772 | * @cmd: operation
|
| 3773 | *
|
| 3774 | * Check permission when a shared memory control operation specified by @cmd is
|
| 3775 | * to be performed on the shared memory region with permissions in @shp.
|
| 3776 | *
|
| 3777 | * Return: Return 0 if permission is granted.
|
| 3778 |
|
| 3779 | int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
|
| 3780 | {
|
| 3781 | return call_int_hook(shm_shmctl, 0, shp, cmd);
|
| 3782 | }
|
| 3783 |
|
| 3784 | |
| 3785 | * security_shm_shmat() - Check if a sysv shm attach operation is allowed
|
| 3786 | * @shp: sysv ipc permission structure
|
| 3787 | * @shmaddr: address of memory region to attach
|
| 3788 | * @shmflg: operation flags
|
| 3789 | *
|
| 3790 | * Check permissions prior to allowing the shmat system call to attach the
|
| 3791 | * shared memory segment with permissions @shp to the data segment of the
|
| 3792 | * calling process. The attaching address is specified by @shmaddr.
|
| 3793 | *
|
| 3794 | * Return: Returns 0 if permission is granted.
|
| 3795 |
|
| 3796 | int security_shm_shmat(struct kern_ipc_perm *shp,
|
| 3797 | char __user *shmaddr, int shmflg)
|
| 3798 | {
|
| 3799 | return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg);
|
| 3800 | }
|
| 3801 |
|
| 3802 | |
| 3803 | * security_sem_alloc() - Allocate a sysv semaphore LSM blob
|
| 3804 | * @sma: sysv ipc permission structure
|
| 3805 | *
|
| 3806 | * Allocate and attach a security structure to the @sma security field. The
|
| 3807 | * security field is initialized to NULL when the structure is first created.
|
| 3808 | *
|
| 3809 | * Return: Returns 0 if operation was successful and permission is granted.
|
| 3810 |
|
| 3811 | int security_sem_alloc(struct kern_ipc_perm *sma)
|
| 3812 | {
|
| 3813 | int rc = lsm_ipc_alloc(sma);
|
| 3814 |
|
| 3815 | if (unlikely(rc))
|
| 3816 | return rc;
|
| 3817 | rc = call_int_hook(sem_alloc_security, 0, sma);
|
| 3818 | if (unlikely(rc))
|
| 3819 | security_sem_free(sma);
|
| 3820 | return rc;
|
| 3821 | }
|
| 3822 |
|
| 3823 | |
| 3824 | * security_sem_free() - Free a sysv semaphore LSM blob
|
| 3825 | * @sma: sysv ipc permission structure
|
| 3826 | *
|
| 3827 | * Deallocate security structure @sma->security for the semaphore.
|
| 3828 |
|
| 3829 | void security_sem_free(struct kern_ipc_perm *sma)
|
| 3830 | {
|
| 3831 | call_void_hook(sem_free_security, sma);
|
| 3832 | kfree(sma->security);
|
| 3833 | sma->security = NULL;
|
| 3834 | }
|
| 3835 |
|
| 3836 | |
| 3837 | * security_sem_associate() - Check if a sysv semaphore operation is allowed
|
| 3838 | * @sma: sysv ipc permission structure
|
| 3839 | * @semflg: operation flags
|
| 3840 | *
|
| 3841 | * Check permission when a semaphore is requested through the semget system
|
| 3842 | * call. This hook is only called when returning the semaphore identifier for
|
| 3843 | * an existing semaphore, not when a new one must be created.
|
| 3844 | *
|
| 3845 | * Return: Returns 0 if permission is granted.
|
| 3846 |
|
| 3847 | int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
|
| 3848 | {
|
| 3849 | return call_int_hook(sem_associate, 0, sma, semflg);
|
| 3850 | }
|
| 3851 |
|
| 3852 | |
| 3853 | * security_sem_semctl() - Check if a sysv semaphore operation is allowed
|
| 3854 | * @sma: sysv ipc permission structure
|
| 3855 | * @cmd: operation
|
| 3856 | *
|
| 3857 | * Check permission when a semaphore operation specified by @cmd is to be
|
| 3858 | * performed on the semaphore.
|
| 3859 | *
|
| 3860 | * Return: Returns 0 if permission is granted.
|
| 3861 |
|
| 3862 | int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
|
| 3863 | {
|
| 3864 | return call_int_hook(sem_semctl, 0, sma, cmd);
|
| 3865 | }
|
| 3866 |
|
| 3867 | |
| 3868 | * security_sem_semop() - Check if a sysv semaphore operation is allowed
|
| 3869 | * @sma: sysv ipc permission structure
|
| 3870 | * @sops: operations to perform
|
| 3871 | * @nsops: number of operations
|
| 3872 | * @alter: flag indicating changes will be made
|
| 3873 | *
|
| 3874 | * Check permissions before performing operations on members of the semaphore
|
| 3875 | * set. If the @alter flag is nonzero, the semaphore set may be modified.
|
| 3876 | *
|
| 3877 | * Return: Returns 0 if permission is granted.
|
| 3878 |
|
| 3879 | int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
|
| 3880 | unsigned nsops, int alter)
|
| 3881 | {
|
| 3882 | return call_int_hook(sem_semop, 0, sma, sops, nsops, alter);
|
| 3883 | }
|
| 3884 |
|
| 3885 | |
| 3886 | * security_d_instantiate() - Populate an inode's LSM state based on a dentry
|
| 3887 | * @dentry: dentry
|
| 3888 | * @inode: inode
|
| 3889 | *
|
| 3890 | * Fill in @inode security information for a @dentry if allowed.
|
| 3891 |
|
| 3892 | void security_d_instantiate(struct dentry *dentry, struct inode *inode)
|
| 3893 | {
|
| 3894 | if (unlikely(inode && IS_PRIVATE(inode)))
|
| 3895 | return;
|
| 3896 | call_void_hook(d_instantiate, dentry, inode);
|
| 3897 | }
|
| 3898 | EXPORT_SYMBOL(security_d_instantiate);
|
| 3899 |
|
| 3900 | |
| 3901 | * Please keep this in sync with it's counterpart in security/lsm_syscalls.c
|
| 3902 |
|
| 3903 |
|
| 3904 | |
| 3905 | * security_getselfattr - Read an LSM attribute of the current process.
|
| 3906 | * @attr: which attribute to return
|
| 3907 | * @uctx: the user-space destination for the information, or NULL
|
| 3908 | * @size: pointer to the size of space available to receive the data
|
| 3909 | * @flags: special handling options. LSM_FLAG_SINGLE indicates that only
|
| 3910 | * attributes associated with the LSM identified in the passed @ctx be
|
| 3911 | * reported.
|
| 3912 | *
|
| 3913 | * A NULL value for @uctx can be used to get both the number of attributes
|
| 3914 | * and the size of the data.
|
| 3915 | *
|
| 3916 | * Returns the number of attributes found on success, negative value
|
| 3917 | * on error. @size is reset to the total size of the data.
|
| 3918 | * If @size is insufficient to contain the data -E2BIG is returned.
|
| 3919 |
|
| 3920 | int security_getselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
|
| 3921 | size_t __user *size, u32 flags)
|
| 3922 | {
|
| 3923 | struct security_hook_list *hp;
|
| 3924 | struct lsm_ctx lctx = { .id = LSM_ID_UNDEF, };
|
| 3925 | u8 __user *base = (u8 __user *)uctx;
|
| 3926 | size_t total = 0;
|
| 3927 | size_t entrysize;
|
| 3928 | size_t left;
|
| 3929 | bool toobig = false;
|
| 3930 | bool single = false;
|
| 3931 | int count = 0;
|
| 3932 | int rc;
|
| 3933 |
|
| 3934 | if (attr == LSM_ATTR_UNDEF)
|
| 3935 | return -EINVAL;
|
| 3936 | if (size == NULL)
|
| 3937 | return -EINVAL;
|
| 3938 | if (get_user(left, size))
|
| 3939 | return -EFAULT;
|
| 3940 |
|
| 3941 | if (flags) {
|
| 3942 | |
| 3943 | * Only flag supported is LSM_FLAG_SINGLE
|
| 3944 |
|
| 3945 | if (flags != LSM_FLAG_SINGLE || !uctx)
|
| 3946 | return -EINVAL;
|
| 3947 | if (copy_from_user(&lctx, uctx, sizeof(lctx)))
|
| 3948 | return -EFAULT;
|
| 3949 | |
| 3950 | * If the LSM ID isn't specified it is an error.
|
| 3951 |
|
| 3952 | if (lctx.id == LSM_ID_UNDEF)
|
| 3953 | return -EINVAL;
|
| 3954 | single = true;
|
| 3955 | }
|
| 3956 |
|
| 3957 | |
| 3958 | * In the usual case gather all the data from the LSMs.
|
| 3959 | * In the single case only get the data from the LSM specified.
|
| 3960 |
|
| 3961 | hlist_for_each_entry(hp, &security_hook_heads.getselfattr, list) {
|
| 3962 | if (single && lctx.id != hp->lsmid->id)
|
| 3963 | continue;
|
| 3964 | entrysize = left;
|
| 3965 | if (base)
|
| 3966 | uctx = (struct lsm_ctx __user *)(base + total);
|
| 3967 | rc = hp->hook.getselfattr(attr, uctx, &entrysize, flags);
|
| 3968 | if (rc == -EOPNOTSUPP) {
|
| 3969 | rc = 0;
|
| 3970 | continue;
|
| 3971 | }
|
| 3972 | if (rc == -E2BIG) {
|
| 3973 | rc = 0;
|
| 3974 | left = 0;
|
| 3975 | toobig = true;
|
| 3976 | } else if (rc < 0)
|
| 3977 | return rc;
|
| 3978 | else
|
| 3979 | left -= entrysize;
|
| 3980 |
|
| 3981 | total += entrysize;
|
| 3982 | count += rc;
|
| 3983 | if (single)
|
| 3984 | break;
|
| 3985 | }
|
| 3986 | if (put_user(total, size))
|
| 3987 | return -EFAULT;
|
| 3988 | if (toobig)
|
| 3989 | return -E2BIG;
|
| 3990 | if (count == 0)
|
| 3991 | return LSM_RET_DEFAULT(getselfattr);
|
| 3992 | return count;
|
| 3993 | }
|
| 3994 |
|
| 3995 | |
| 3996 | * Please keep this in sync with it's counterpart in security/lsm_syscalls.c
|
| 3997 |
|
| 3998 |
|
| 3999 | |
| 4000 | * security_setselfattr - Set an LSM attribute on the current process.
|
| 4001 | * @attr: which attribute to set
|
| 4002 | * @uctx: the user-space source for the information
|
| 4003 | * @size: the size of the data
|
| 4004 | * @flags: reserved for future use, must be 0
|
| 4005 | *
|
| 4006 | * Set an LSM attribute for the current process. The LSM, attribute
|
| 4007 | * and new value are included in @uctx.
|
| 4008 | *
|
| 4009 | * Returns 0 on success, -EINVAL if the input is inconsistent, -EFAULT
|
| 4010 | * if the user buffer is inaccessible, E2BIG if size is too big, or an
|
| 4011 | * LSM specific failure.
|
| 4012 |
|
| 4013 | int security_setselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
|
| 4014 | size_t size, u32 flags)
|
| 4015 | {
|
| 4016 | struct security_hook_list *hp;
|
| 4017 | struct lsm_ctx *lctx;
|
| 4018 | int rc = LSM_RET_DEFAULT(setselfattr);
|
| 4019 | u64 required_len;
|
| 4020 |
|
| 4021 | if (flags)
|
| 4022 | return -EINVAL;
|
| 4023 | if (size < sizeof(*lctx))
|
| 4024 | return -EINVAL;
|
| 4025 | if (size > PAGE_SIZE)
|
| 4026 | return -E2BIG;
|
| 4027 |
|
| 4028 | lctx = memdup_user(uctx, size);
|
| 4029 | if (IS_ERR(lctx))
|
| 4030 | return PTR_ERR(lctx);
|
| 4031 |
|
| 4032 | if (size < lctx->len ||
|
| 4033 | check_add_overflow(sizeof(*lctx), lctx->ctx_len, &required_len) ||
|
| 4034 | lctx->len < required_len) {
|
| 4035 | rc = -EINVAL;
|
| 4036 | goto free_out;
|
| 4037 | }
|
| 4038 |
|
| 4039 | hlist_for_each_entry(hp, &security_hook_heads.setselfattr, list)
|
| 4040 | if ((hp->lsmid->id) == lctx->id) {
|
| 4041 | rc = hp->hook.setselfattr(attr, lctx, size, flags);
|
| 4042 | break;
|
| 4043 | }
|
| 4044 |
|
| 4045 | free_out:
|
| 4046 | kfree(lctx);
|
| 4047 | return rc;
|
| 4048 | }
|
| 4049 |
|
| 4050 | |
| 4051 | * security_getprocattr() - Read an attribute for a task
|
| 4052 | * @p: the task
|
| 4053 | * @lsmid: LSM identification
|
| 4054 | * @name: attribute name
|
| 4055 | * @value: attribute value
|
| 4056 | *
|
| 4057 | * Read attribute @name for task @p and store it into @value if allowed.
|
| 4058 | *
|
| 4059 | * Return: Returns the length of @value on success, a negative value otherwise.
|
| 4060 |
|
| 4061 | int security_getprocattr(struct task_struct *p, int lsmid, const char *name,
|
| 4062 | char **value)
|
| 4063 | {
|
| 4064 | struct security_hook_list *hp;
|
| 4065 |
|
| 4066 | hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
|
| 4067 | if (lsmid != 0 && lsmid != hp->lsmid->id)
|
| 4068 | continue;
|
| 4069 | return hp->hook.getprocattr(p, name, value);
|
| 4070 | }
|
| 4071 | return LSM_RET_DEFAULT(getprocattr);
|
| 4072 | }
|
| 4073 |
|
| 4074 | |
| 4075 | * security_setprocattr() - Set an attribute for a task
|
| 4076 | * @lsmid: LSM identification
|
| 4077 | * @name: attribute name
|
| 4078 | * @value: attribute value
|
| 4079 | * @size: attribute value size
|
| 4080 | *
|
| 4081 | * Write (set) the current task's attribute @name to @value, size @size if
|
| 4082 | * allowed.
|
| 4083 | *
|
| 4084 | * Return: Returns bytes written on success, a negative value otherwise.
|
| 4085 |
|
| 4086 | int security_setprocattr(int lsmid, const char *name, void *value, size_t size)
|
| 4087 | {
|
| 4088 | struct security_hook_list *hp;
|
| 4089 |
|
| 4090 | hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
|
| 4091 | if (lsmid != 0 && lsmid != hp->lsmid->id)
|
| 4092 | continue;
|
| 4093 | return hp->hook.setprocattr(name, value, size);
|
| 4094 | }
|
| 4095 | return LSM_RET_DEFAULT(setprocattr);
|
| 4096 | }
|
| 4097 |
|
| 4098 | |
| 4099 | * security_netlink_send() - Save info and check if netlink sending is allowed
|
| 4100 | * @sk: sending socket
|
| 4101 | * @skb: netlink message
|
| 4102 | *
|
| 4103 | * Save security information for a netlink message so that permission checking
|
| 4104 | * can be performed when the message is processed. The security information
|
| 4105 | * can be saved using the eff_cap field of the netlink_skb_parms structure.
|
| 4106 | * Also may be used to provide fine grained control over message transmission.
|
| 4107 | *
|
| 4108 | * Return: Returns 0 if the information was successfully saved and message is
|
| 4109 | * allowed to be transmitted.
|
| 4110 |
|
| 4111 | int security_netlink_send(struct sock *sk, struct sk_buff *skb)
|
| 4112 | {
|
| 4113 | return call_int_hook(netlink_send, 0, sk, skb);
|
| 4114 | }
|
| 4115 |
|
| 4116 | |
| 4117 | * security_ismaclabel() - Check is the named attribute is a MAC label
|
| 4118 | * @name: full extended attribute name
|
| 4119 | *
|
| 4120 | * Check if the extended attribute specified by @name represents a MAC label.
|
| 4121 | *
|
| 4122 | * Return: Returns 1 if name is a MAC attribute otherwise returns 0.
|
| 4123 |
|
| 4124 | int security_ismaclabel(const char *name)
|
| 4125 | {
|
| 4126 | return call_int_hook(ismaclabel, 0, name);
|
| 4127 | }
|
| 4128 | EXPORT_SYMBOL(security_ismaclabel);
|
| 4129 |
|
| 4130 | |
| 4131 | * security_secid_to_secctx() - Convert a secid to a secctx
|
| 4132 | * @secid: secid
|
| 4133 | * @secdata: secctx
|
| 4134 | * @seclen: secctx length
|
| 4135 | *
|
| 4136 | * Convert secid to security context. If @secdata is NULL the length of the
|
| 4137 | * result will be returned in @seclen, but no @secdata will be returned. This
|
| 4138 | * does mean that the length could change between calls to check the length and
|
| 4139 | * the next call which actually allocates and returns the @secdata.
|
| 4140 | *
|
| 4141 | * Return: Return 0 on success, error on failure.
|
| 4142 |
|
| 4143 | int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
|
| 4144 | {
|
| 4145 | struct security_hook_list *hp;
|
| 4146 | int rc;
|
| 4147 |
|
| 4148 | |
| 4149 | * Currently, only one LSM can implement secid_to_secctx (i.e this
|
| 4150 | * LSM hook is not "stackable").
|
| 4151 |
|
| 4152 | hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
|
| 4153 | rc = hp->hook.secid_to_secctx(secid, secdata, seclen);
|
| 4154 | if (rc != LSM_RET_DEFAULT(secid_to_secctx))
|
| 4155 | return rc;
|
| 4156 | }
|
| 4157 |
|
| 4158 | return LSM_RET_DEFAULT(secid_to_secctx);
|
| 4159 | }
|
| 4160 | EXPORT_SYMBOL(security_secid_to_secctx);
|
| 4161 |
|
| 4162 | |
| 4163 | * security_secctx_to_secid() - Convert a secctx to a secid
|
| 4164 | * @secdata: secctx
|
| 4165 | * @seclen: length of secctx
|
| 4166 | * @secid: secid
|
| 4167 | *
|
| 4168 | * Convert security context to secid.
|
| 4169 | *
|
| 4170 | * Return: Returns 0 on success, error on failure.
|
| 4171 |
|
| 4172 | int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
|
| 4173 | {
|
| 4174 | *secid = 0;
|
| 4175 | return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid);
|
| 4176 | }
|
| 4177 | EXPORT_SYMBOL(security_secctx_to_secid);
|
| 4178 |
|
| 4179 | |
| 4180 | * security_release_secctx() - Free a secctx buffer
|
| 4181 | * @secdata: secctx
|
| 4182 | * @seclen: length of secctx
|
| 4183 | *
|
| 4184 | * Release the security context.
|
| 4185 |
|
| 4186 | void security_release_secctx(char *secdata, u32 seclen)
|
| 4187 | {
|
| 4188 | call_void_hook(release_secctx, secdata, seclen);
|
| 4189 | }
|
| 4190 | EXPORT_SYMBOL(security_release_secctx);
|
| 4191 |
|
| 4192 | |
| 4193 | * security_inode_invalidate_secctx() - Invalidate an inode's security label
|
| 4194 | * @inode: inode
|
| 4195 | *
|
| 4196 | * Notify the security module that it must revalidate the security context of
|
| 4197 | * an inode.
|
| 4198 |
|
| 4199 | void security_inode_invalidate_secctx(struct inode *inode)
|
| 4200 | {
|
| 4201 | call_void_hook(inode_invalidate_secctx, inode);
|
| 4202 | }
|
| 4203 | EXPORT_SYMBOL(security_inode_invalidate_secctx);
|
| 4204 |
|
| 4205 | |
| 4206 | * security_inode_notifysecctx() - Notify the LSM of an inode's security label
|
| 4207 | * @inode: inode
|
| 4208 | * @ctx: secctx
|
| 4209 | * @ctxlen: length of secctx
|
| 4210 | *
|
| 4211 | * Notify the security module of what the security context of an inode should
|
| 4212 | * be. Initializes the incore security context managed by the security module
|
| 4213 | * for this inode. Example usage: NFS client invokes this hook to initialize
|
| 4214 | * the security context in its incore inode to the value provided by the server
|
| 4215 | * for the file when the server returned the file's attributes to the client.
|
| 4216 | * Must be called with inode->i_mutex locked.
|
| 4217 | *
|
| 4218 | * Return: Returns 0 on success, error on failure.
|
| 4219 |
|
| 4220 | int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
|
| 4221 | {
|
| 4222 | return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen);
|
| 4223 | }
|
| 4224 | EXPORT_SYMBOL(security_inode_notifysecctx);
|
| 4225 |
|
| 4226 | |
| 4227 | * security_inode_setsecctx() - Change the security label of an inode
|
| 4228 | * @dentry: inode
|
| 4229 | * @ctx: secctx
|
| 4230 | * @ctxlen: length of secctx
|
| 4231 | *
|
| 4232 | * Change the security context of an inode. Updates the incore security
|
| 4233 | * context managed by the security module and invokes the fs code as needed
|
| 4234 | * (via __vfs_setxattr_noperm) to update any backing xattrs that represent the
|
| 4235 | * context. Example usage: NFS server invokes this hook to change the security
|
| 4236 | * context in its incore inode and on the backing filesystem to a value
|
| 4237 | * provided by the client on a SETATTR operation. Must be called with
|
| 4238 | * inode->i_mutex locked.
|
| 4239 | *
|
| 4240 | * Return: Returns 0 on success, error on failure.
|
| 4241 |
|
| 4242 | int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
|
| 4243 | {
|
| 4244 | return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen);
|
| 4245 | }
|
| 4246 | EXPORT_SYMBOL(security_inode_setsecctx);
|
| 4247 |
|
| 4248 | |
| 4249 | * security_inode_getsecctx() - Get the security label of an inode
|
| 4250 | * @inode: inode
|
| 4251 | * @ctx: secctx
|
| 4252 | * @ctxlen: length of secctx
|
| 4253 | *
|
| 4254 | * On success, returns 0 and fills out @ctx and @ctxlen with the security
|
| 4255 | * context for the given @inode.
|
| 4256 | *
|
| 4257 | * Return: Returns 0 on success, error on failure.
|
| 4258 |
|
| 4259 | int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
|
| 4260 | {
|
| 4261 | struct security_hook_list *hp;
|
| 4262 | int rc;
|
| 4263 |
|
| 4264 | |
| 4265 | * Only one module will provide a security context.
|
| 4266 |
|
| 4267 | hlist_for_each_entry(hp, &security_hook_heads.inode_getsecctx, list) {
|
| 4268 | rc = hp->hook.inode_getsecctx(inode, ctx, ctxlen);
|
| 4269 | if (rc != LSM_RET_DEFAULT(inode_getsecctx))
|
| 4270 | return rc;
|
| 4271 | }
|
| 4272 |
|
| 4273 | return LSM_RET_DEFAULT(inode_getsecctx);
|
| 4274 | }
|
| 4275 | EXPORT_SYMBOL(security_inode_getsecctx);
|
| 4276 |
|
| 4277 | #ifdef CONFIG_WATCH_QUEUE
|
| 4278 | |
| 4279 | * security_post_notification() - Check if a watch notification can be posted
|
| 4280 | * @w_cred: credentials of the task that set the watch
|
| 4281 | * @cred: credentials of the task which triggered the watch
|
| 4282 | * @n: the notification
|
| 4283 | *
|
| 4284 | * Check to see if a watch notification can be posted to a particular queue.
|
| 4285 | *
|
| 4286 | * Return: Returns 0 if permission is granted.
|
| 4287 |
|
| 4288 | int security_post_notification(const struct cred *w_cred,
|
| 4289 | const struct cred *cred,
|
| 4290 | struct watch_notification *n)
|
| 4291 | {
|
| 4292 | return call_int_hook(post_notification, 0, w_cred, cred, n);
|
| 4293 | }
|
| 4294 | #endif
|
| 4295 |
|
| 4296 | #ifdef CONFIG_KEY_NOTIFICATIONS
|
| 4297 | |
| 4298 | * security_watch_key() - Check if a task is allowed to watch for key events
|
| 4299 | * @key: the key to watch
|
| 4300 | *
|
| 4301 | * Check to see if a process is allowed to watch for event notifications from
|
| 4302 | * a key or keyring.
|
| 4303 | *
|
| 4304 | * Return: Returns 0 if permission is granted.
|
| 4305 |
|
| 4306 | int security_watch_key(struct key *key)
|
| 4307 | {
|
| 4308 | return call_int_hook(watch_key, 0, key);
|
| 4309 | }
|
| 4310 | #endif
|
| 4311 |
|
| 4312 | #ifdef CONFIG_SECURITY_NETWORK
|
| 4313 | |
| 4314 | * security_unix_stream_connect() - Check if a AF_UNIX stream is allowed
|
| 4315 | * @sock: originating sock
|
| 4316 | * @other: peer sock
|
| 4317 | * @newsk: new sock
|
| 4318 | *
|
| 4319 | * Check permissions before establishing a Unix domain stream connection
|
| 4320 | * between @sock and @other.
|
| 4321 | *
|
| 4322 | * The @unix_stream_connect and @unix_may_send hooks were necessary because
|
| 4323 | * Linux provides an alternative to the conventional file name space for Unix
|
| 4324 | * domain sockets. Whereas binding and connecting to sockets in the file name
|
| 4325 | * space is mediated by the typical file permissions (and caught by the mknod
|
| 4326 | * and permission hooks in inode_security_ops), binding and connecting to
|
| 4327 | * sockets in the abstract name space is completely unmediated. Sufficient
|
| 4328 | * control of Unix domain sockets in the abstract name space isn't possible
|
| 4329 | * using only the socket layer hooks, since we need to know the actual target
|
| 4330 | * socket, which is not looked up until we are inside the af_unix code.
|
| 4331 | *
|
| 4332 | * Return: Returns 0 if permission is granted.
|
| 4333 |
|
| 4334 | int security_unix_stream_connect(struct sock *sock, struct sock *other,
|
| 4335 | struct sock *newsk)
|
| 4336 | {
|
| 4337 | return call_int_hook(unix_stream_connect, 0, sock, other, newsk);
|
| 4338 | }
|
| 4339 | EXPORT_SYMBOL(security_unix_stream_connect);
|
| 4340 |
|
| 4341 | |
| 4342 | * security_unix_may_send() - Check if AF_UNIX socket can send datagrams
|
| 4343 | * @sock: originating sock
|
| 4344 | * @other: peer sock
|
| 4345 | *
|
| 4346 | * Check permissions before connecting or sending datagrams from @sock to
|
| 4347 | * @other.
|
| 4348 | *
|
| 4349 | * The @unix_stream_connect and @unix_may_send hooks were necessary because
|
| 4350 | * Linux provides an alternative to the conventional file name space for Unix
|
| 4351 | * domain sockets. Whereas binding and connecting to sockets in the file name
|
| 4352 | * space is mediated by the typical file permissions (and caught by the mknod
|
| 4353 | * and permission hooks in inode_security_ops), binding and connecting to
|
| 4354 | * sockets in the abstract name space is completely unmediated. Sufficient
|
| 4355 | * control of Unix domain sockets in the abstract name space isn't possible
|
| 4356 | * using only the socket layer hooks, since we need to know the actual target
|
| 4357 | * socket, which is not looked up until we are inside the af_unix code.
|
| 4358 | *
|
| 4359 | * Return: Returns 0 if permission is granted.
|
| 4360 |
|
| 4361 | int security_unix_may_send(struct socket *sock, struct socket *other)
|
| 4362 | {
|
| 4363 | return call_int_hook(unix_may_send, 0, sock, other);
|
| 4364 | }
|
| 4365 | EXPORT_SYMBOL(security_unix_may_send);
|
| 4366 |
|
| 4367 | |
| 4368 | * security_socket_create() - Check if creating a new socket is allowed
|
| 4369 | * @family: protocol family
|
| 4370 | * @type: communications type
|
| 4371 | * @protocol: requested protocol
|
| 4372 | * @kern: set to 1 if a kernel socket is requested
|
| 4373 | *
|
| 4374 | * Check permissions prior to creating a new socket.
|
| 4375 | *
|
| 4376 | * Return: Returns 0 if permission is granted.
|
| 4377 |
|
| 4378 | int security_socket_create(int family, int type, int protocol, int kern)
|
| 4379 | {
|
| 4380 | return call_int_hook(socket_create, 0, family, type, protocol, kern);
|
| 4381 | }
|
| 4382 |
|
| 4383 | |
| 4384 | * security_socket_post_create() - Initialize a newly created socket
|
| 4385 | * @sock: socket
|
| 4386 | * @family: protocol family
|
| 4387 | * @type: communications type
|
| 4388 | * @protocol: requested protocol
|
| 4389 | * @kern: set to 1 if a kernel socket is requested
|
| 4390 | *
|
| 4391 | * This hook allows a module to update or allocate a per-socket security
|
| 4392 | * structure. Note that the security field was not added directly to the socket
|
| 4393 | * structure, but rather, the socket security information is stored in the
|
| 4394 | * associated inode. Typically, the inode alloc_security hook will allocate
|
| 4395 | * and attach security information to SOCK_INODE(sock)->i_security. This hook
|
| 4396 | * may be used to update the SOCK_INODE(sock)->i_security field with additional
|
| 4397 | * information that wasn't available when the inode was allocated.
|
| 4398 | *
|
| 4399 | * Return: Returns 0 if permission is granted.
|
| 4400 |
|
| 4401 | int security_socket_post_create(struct socket *sock, int family,
|
| 4402 | int type, int protocol, int kern)
|
| 4403 | {
|
| 4404 | return call_int_hook(socket_post_create, 0, sock, family, type,
|
| 4405 | protocol, kern);
|
| 4406 | }
|
| 4407 |
|
| 4408 | |
| 4409 | * security_socket_socketpair() - Check if creating a socketpair is allowed
|
| 4410 | * @socka: first socket
|
| 4411 | * @sockb: second socket
|
| 4412 | *
|
| 4413 | * Check permissions before creating a fresh pair of sockets.
|
| 4414 | *
|
| 4415 | * Return: Returns 0 if permission is granted and the connection was
|
| 4416 | * established.
|
| 4417 |
|
| 4418 | int security_socket_socketpair(struct socket *socka, struct socket *sockb)
|
| 4419 | {
|
| 4420 | return call_int_hook(socket_socketpair, 0, socka, sockb);
|
| 4421 | }
|
| 4422 | EXPORT_SYMBOL(security_socket_socketpair);
|
| 4423 |
|
| 4424 | |
| 4425 | * security_socket_bind() - Check if a socket bind operation is allowed
|
| 4426 | * @sock: socket
|
| 4427 | * @address: requested bind address
|
| 4428 | * @addrlen: length of address
|
| 4429 | *
|
| 4430 | * Check permission before socket protocol layer bind operation is performed
|
| 4431 | * and the socket @sock is bound to the address specified in the @address
|
| 4432 | * parameter.
|
| 4433 | *
|
| 4434 | * Return: Returns 0 if permission is granted.
|
| 4435 |
|
| 4436 | int security_socket_bind(struct socket *sock,
|
| 4437 | struct sockaddr *address, int addrlen)
|
| 4438 | {
|
| 4439 | return call_int_hook(socket_bind, 0, sock, address, addrlen);
|
| 4440 | }
|
| 4441 |
|
| 4442 | |
| 4443 | * security_socket_connect() - Check if a socket connect operation is allowed
|
| 4444 | * @sock: socket
|
| 4445 | * @address: address of remote connection point
|
| 4446 | * @addrlen: length of address
|
| 4447 | *
|
| 4448 | * Check permission before socket protocol layer connect operation attempts to
|
| 4449 | * connect socket @sock to a remote address, @address.
|
| 4450 | *
|
| 4451 | * Return: Returns 0 if permission is granted.
|
| 4452 |
|
| 4453 | int security_socket_connect(struct socket *sock,
|
| 4454 | struct sockaddr *address, int addrlen)
|
| 4455 | {
|
| 4456 | return call_int_hook(socket_connect, 0, sock, address, addrlen);
|
| 4457 | }
|
| 4458 |
|
| 4459 | |
| 4460 | * security_socket_listen() - Check if a socket is allowed to listen
|
| 4461 | * @sock: socket
|
| 4462 | * @backlog: connection queue size
|
| 4463 | *
|
| 4464 | * Check permission before socket protocol layer listen operation.
|
| 4465 | *
|
| 4466 | * Return: Returns 0 if permission is granted.
|
| 4467 |
|
| 4468 | int security_socket_listen(struct socket *sock, int backlog)
|
| 4469 | {
|
| 4470 | return call_int_hook(socket_listen, 0, sock, backlog);
|
| 4471 | }
|
| 4472 |
|
| 4473 | |
| 4474 | * security_socket_accept() - Check if a socket is allowed to accept connections
|
| 4475 | * @sock: listening socket
|
| 4476 | * @newsock: newly creation connection socket
|
| 4477 | *
|
| 4478 | * Check permission before accepting a new connection. Note that the new
|
| 4479 | * socket, @newsock, has been created and some information copied to it, but
|
| 4480 | * the accept operation has not actually been performed.
|
| 4481 | *
|
| 4482 | * Return: Returns 0 if permission is granted.
|
| 4483 |
|
| 4484 | int security_socket_accept(struct socket *sock, struct socket *newsock)
|
| 4485 | {
|
| 4486 | return call_int_hook(socket_accept, 0, sock, newsock);
|
| 4487 | }
|
| 4488 |
|
| 4489 | |
| 4490 | * security_socket_sendmsg() - Check is sending a message is allowed
|
| 4491 | * @sock: sending socket
|
| 4492 | * @msg: message to send
|
| 4493 | * @size: size of message
|
| 4494 | *
|
| 4495 | * Check permission before transmitting a message to another socket.
|
| 4496 | *
|
| 4497 | * Return: Returns 0 if permission is granted.
|
| 4498 |
|
| 4499 | int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
|
| 4500 | {
|
| 4501 | return call_int_hook(socket_sendmsg, 0, sock, msg, size);
|
| 4502 | }
|
| 4503 |
|
| 4504 | |
| 4505 | * security_socket_recvmsg() - Check if receiving a message is allowed
|
| 4506 | * @sock: receiving socket
|
| 4507 | * @msg: message to receive
|
| 4508 | * @size: size of message
|
| 4509 | * @flags: operational flags
|
| 4510 | *
|
| 4511 | * Check permission before receiving a message from a socket.
|
| 4512 | *
|
| 4513 | * Return: Returns 0 if permission is granted.
|
| 4514 |
|
| 4515 | int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
|
| 4516 | int size, int flags)
|
| 4517 | {
|
| 4518 | return call_int_hook(socket_recvmsg, 0, sock, msg, size, flags);
|
| 4519 | }
|
| 4520 |
|
| 4521 | |
| 4522 | * security_socket_getsockname() - Check if reading the socket addr is allowed
|
| 4523 | * @sock: socket
|
| 4524 | *
|
| 4525 | * Check permission before reading the local address (name) of the socket
|
| 4526 | * object.
|
| 4527 | *
|
| 4528 | * Return: Returns 0 if permission is granted.
|
| 4529 |
|
| 4530 | int security_socket_getsockname(struct socket *sock)
|
| 4531 | {
|
| 4532 | return call_int_hook(socket_getsockname, 0, sock);
|
| 4533 | }
|
| 4534 |
|
| 4535 | |
| 4536 | * security_socket_getpeername() - Check if reading the peer's addr is allowed
|
| 4537 | * @sock: socket
|
| 4538 | *
|
| 4539 | * Check permission before the remote address (name) of a socket object.
|
| 4540 | *
|
| 4541 | * Return: Returns 0 if permission is granted.
|
| 4542 |
|
| 4543 | int security_socket_getpeername(struct socket *sock)
|
| 4544 | {
|
| 4545 | return call_int_hook(socket_getpeername, 0, sock);
|
| 4546 | }
|
| 4547 |
|
| 4548 | |
| 4549 | * security_socket_getsockopt() - Check if reading a socket option is allowed
|
| 4550 | * @sock: socket
|
| 4551 | * @level: option's protocol level
|
| 4552 | * @optname: option name
|
| 4553 | *
|
| 4554 | * Check permissions before retrieving the options associated with socket
|
| 4555 | * @sock.
|
| 4556 | *
|
| 4557 | * Return: Returns 0 if permission is granted.
|
| 4558 |
|
| 4559 | int security_socket_getsockopt(struct socket *sock, int level, int optname)
|
| 4560 | {
|
| 4561 | return call_int_hook(socket_getsockopt, 0, sock, level, optname);
|
| 4562 | }
|
| 4563 |
|
| 4564 | |
| 4565 | * security_socket_setsockopt() - Check if setting a socket option is allowed
|
| 4566 | * @sock: socket
|
| 4567 | * @level: option's protocol level
|
| 4568 | * @optname: option name
|
| 4569 | *
|
| 4570 | * Check permissions before setting the options associated with socket @sock.
|
| 4571 | *
|
| 4572 | * Return: Returns 0 if permission is granted.
|
| 4573 |
|
| 4574 | int security_socket_setsockopt(struct socket *sock, int level, int optname)
|
| 4575 | {
|
| 4576 | return call_int_hook(socket_setsockopt, 0, sock, level, optname);
|
| 4577 | }
|
| 4578 |
|
| 4579 | |
| 4580 | * security_socket_shutdown() - Checks if shutting down the socket is allowed
|
| 4581 | * @sock: socket
|
| 4582 | * @how: flag indicating how sends and receives are handled
|
| 4583 | *
|
| 4584 | * Checks permission before all or part of a connection on the socket @sock is
|
| 4585 | * shut down.
|
| 4586 | *
|
| 4587 | * Return: Returns 0 if permission is granted.
|
| 4588 |
|
| 4589 | int security_socket_shutdown(struct socket *sock, int how)
|
| 4590 | {
|
| 4591 | return call_int_hook(socket_shutdown, 0, sock, how);
|
| 4592 | }
|
| 4593 |
|
| 4594 | |
| 4595 | * security_sock_rcv_skb() - Check if an incoming network packet is allowed
|
| 4596 | * @sk: destination sock
|
| 4597 | * @skb: incoming packet
|
| 4598 | *
|
| 4599 | * Check permissions on incoming network packets. This hook is distinct from
|
| 4600 | * Netfilter's IP input hooks since it is the first time that the incoming
|
| 4601 | * sk_buff @skb has been associated with a particular socket, @sk. Must not
|
| 4602 | * sleep inside this hook because some callers hold spinlocks.
|
| 4603 | *
|
| 4604 | * Return: Returns 0 if permission is granted.
|
| 4605 |
|
| 4606 | int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
| 4607 | {
|
| 4608 | return call_int_hook(socket_sock_rcv_skb, 0, sk, skb);
|
| 4609 | }
|
| 4610 | EXPORT_SYMBOL(security_sock_rcv_skb);
|
| 4611 |
|
| 4612 | |
| 4613 | * security_socket_getpeersec_stream() - Get the remote peer label
|
| 4614 | * @sock: socket
|
| 4615 | * @optval: destination buffer
|
| 4616 | * @optlen: size of peer label copied into the buffer
|
| 4617 | * @len: maximum size of the destination buffer
|
| 4618 | *
|
| 4619 | * This hook allows the security module to provide peer socket security state
|
| 4620 | * for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC.
|
| 4621 | * For tcp sockets this can be meaningful if the socket is associated with an
|
| 4622 | * ipsec SA.
|
| 4623 | *
|
| 4624 | * Return: Returns 0 if all is well, otherwise, typical getsockopt return
|
| 4625 | * values.
|
| 4626 |
|
| 4627 | int security_socket_getpeersec_stream(struct socket *sock, sockptr_t optval,
|
| 4628 | sockptr_t optlen, unsigned int len)
|
| 4629 | {
|
| 4630 | struct security_hook_list *hp;
|
| 4631 | int rc;
|
| 4632 |
|
| 4633 | |
| 4634 | * Only one module will provide a security context.
|
| 4635 |
|
| 4636 | hlist_for_each_entry(hp, &security_hook_heads.socket_getpeersec_stream,
|
| 4637 | list) {
|
| 4638 | rc = hp->hook.socket_getpeersec_stream(sock, optval, optlen,
|
| 4639 | len);
|
| 4640 | if (rc != LSM_RET_DEFAULT(socket_getpeersec_stream))
|
| 4641 | return rc;
|
| 4642 | }
|
| 4643 | return LSM_RET_DEFAULT(socket_getpeersec_stream);
|
| 4644 | }
|
| 4645 |
|
| 4646 | |
| 4647 | * security_socket_getpeersec_dgram() - Get the remote peer label
|
| 4648 | * @sock: socket
|
| 4649 | * @skb: datagram packet
|
| 4650 | * @secid: remote peer label secid
|
| 4651 | *
|
| 4652 | * This hook allows the security module to provide peer socket security state
|
| 4653 | * for udp sockets on a per-packet basis to userspace via getsockopt
|
| 4654 | * SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC
|
| 4655 | * option via getsockopt. It can then retrieve the security state returned by
|
| 4656 | * this hook for a packet via the SCM_SECURITY ancillary message type.
|
| 4657 | *
|
| 4658 | * Return: Returns 0 on success, error on failure.
|
| 4659 |
|
| 4660 | int security_socket_getpeersec_dgram(struct socket *sock,
|
| 4661 | struct sk_buff *skb, u32 *secid)
|
| 4662 | {
|
| 4663 | struct security_hook_list *hp;
|
| 4664 | int rc;
|
| 4665 |
|
| 4666 | |
| 4667 | * Only one module will provide a security context.
|
| 4668 |
|
| 4669 | hlist_for_each_entry(hp, &security_hook_heads.socket_getpeersec_dgram,
|
| 4670 | list) {
|
| 4671 | rc = hp->hook.socket_getpeersec_dgram(sock, skb, secid);
|
| 4672 | if (rc != LSM_RET_DEFAULT(socket_getpeersec_dgram))
|
| 4673 | return rc;
|
| 4674 | }
|
| 4675 | return LSM_RET_DEFAULT(socket_getpeersec_dgram);
|
| 4676 | }
|
| 4677 | EXPORT_SYMBOL(security_socket_getpeersec_dgram);
|
| 4678 |
|
| 4679 | |
| 4680 | * security_sk_alloc() - Allocate and initialize a sock's LSM blob
|
| 4681 | * @sk: sock
|
| 4682 | * @family: protocol family
|
| 4683 | * @priority: gfp flags
|
| 4684 | *
|
| 4685 | * Allocate and attach a security structure to the sk->sk_security field, which
|
| 4686 | * is used to copy security attributes between local stream sockets.
|
| 4687 | *
|
| 4688 | * Return: Returns 0 on success, error on failure.
|
| 4689 |
|
| 4690 | int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
|
| 4691 | {
|
| 4692 | return call_int_hook(sk_alloc_security, 0, sk, family, priority);
|
| 4693 | }
|
| 4694 |
|
| 4695 | |
| 4696 | * security_sk_free() - Free the sock's LSM blob
|
| 4697 | * @sk: sock
|
| 4698 | *
|
| 4699 | * Deallocate security structure.
|
| 4700 |
|
| 4701 | void security_sk_free(struct sock *sk)
|
| 4702 | {
|
| 4703 | call_void_hook(sk_free_security, sk);
|
| 4704 | }
|
| 4705 |
|
| 4706 | |
| 4707 | * security_sk_clone() - Clone a sock's LSM state
|
| 4708 | * @sk: original sock
|
| 4709 | * @newsk: target sock
|
| 4710 | *
|
| 4711 | * Clone/copy security structure.
|
| 4712 |
|
| 4713 | void security_sk_clone(const struct sock *sk, struct sock *newsk)
|
| 4714 | {
|
| 4715 | call_void_hook(sk_clone_security, sk, newsk);
|
| 4716 | }
|
| 4717 | EXPORT_SYMBOL(security_sk_clone);
|
| 4718 |
|
| 4719 | |
| 4720 | * security_sk_classify_flow() - Set a flow's secid based on socket
|
| 4721 | * @sk: original socket
|
| 4722 | * @flic: target flow
|
| 4723 | *
|
| 4724 | * Set the target flow's secid to socket's secid.
|
| 4725 |
|
| 4726 | void security_sk_classify_flow(const struct sock *sk, struct flowi_common *flic)
|
| 4727 | {
|
| 4728 | call_void_hook(sk_getsecid, sk, &flic->flowic_secid);
|
| 4729 | }
|
| 4730 | EXPORT_SYMBOL(security_sk_classify_flow);
|
| 4731 |
|
| 4732 | |
| 4733 | * security_req_classify_flow() - Set a flow's secid based on request_sock
|
| 4734 | * @req: request_sock
|
| 4735 | * @flic: target flow
|
| 4736 | *
|
| 4737 | * Sets @flic's secid to @req's secid.
|
| 4738 |
|
| 4739 | void security_req_classify_flow(const struct request_sock *req,
|
| 4740 | struct flowi_common *flic)
|
| 4741 | {
|
| 4742 | call_void_hook(req_classify_flow, req, flic);
|
| 4743 | }
|
| 4744 | EXPORT_SYMBOL(security_req_classify_flow);
|
| 4745 |
|
| 4746 | |
| 4747 | * security_sock_graft() - Reconcile LSM state when grafting a sock on a socket
|
| 4748 | * @sk: sock being grafted
|
| 4749 | * @parent: target parent socket
|
| 4750 | *
|
| 4751 | * Sets @parent's inode secid to @sk's secid and update @sk with any necessary
|
| 4752 | * LSM state from @parent.
|
| 4753 |
|
| 4754 | void security_sock_graft(struct sock *sk, struct socket *parent)
|
| 4755 | {
|
| 4756 | call_void_hook(sock_graft, sk, parent);
|
| 4757 | }
|
| 4758 | EXPORT_SYMBOL(security_sock_graft);
|
| 4759 |
|
| 4760 | |
| 4761 | * security_inet_conn_request() - Set request_sock state using incoming connect
|
| 4762 | * @sk: parent listening sock
|
| 4763 | * @skb: incoming connection
|
| 4764 | * @req: new request_sock
|
| 4765 | *
|
| 4766 | * Initialize the @req LSM state based on @sk and the incoming connect in @skb.
|
| 4767 | *
|
| 4768 | * Return: Returns 0 if permission is granted.
|
| 4769 |
|
| 4770 | int security_inet_conn_request(const struct sock *sk,
|
| 4771 | struct sk_buff *skb, struct request_sock *req)
|
| 4772 | {
|
| 4773 | return call_int_hook(inet_conn_request, 0, sk, skb, req);
|
| 4774 | }
|
| 4775 | EXPORT_SYMBOL(security_inet_conn_request);
|
| 4776 |
|
| 4777 | |
| 4778 | * security_inet_csk_clone() - Set new sock LSM state based on request_sock
|
| 4779 | * @newsk: new sock
|
| 4780 | * @req: connection request_sock
|
| 4781 | *
|
| 4782 | * Set that LSM state of @sock using the LSM state from @req.
|
| 4783 |
|
| 4784 | void security_inet_csk_clone(struct sock *newsk,
|
| 4785 | const struct request_sock *req)
|
| 4786 | {
|
| 4787 | call_void_hook(inet_csk_clone, newsk, req);
|
| 4788 | }
|
| 4789 |
|
| 4790 | |
| 4791 | * security_inet_conn_established() - Update sock's LSM state with connection
|
| 4792 | * @sk: sock
|
| 4793 | * @skb: connection packet
|
| 4794 | *
|
| 4795 | * Update @sock's LSM state to represent a new connection from @skb.
|
| 4796 |
|
| 4797 | void security_inet_conn_established(struct sock *sk,
|
| 4798 | struct sk_buff *skb)
|
| 4799 | {
|
| 4800 | call_void_hook(inet_conn_established, sk, skb);
|
| 4801 | }
|
| 4802 | EXPORT_SYMBOL(security_inet_conn_established);
|
| 4803 |
|
| 4804 | |
| 4805 | * security_secmark_relabel_packet() - Check if setting a secmark is allowed
|
| 4806 | * @secid: new secmark value
|
| 4807 | *
|
| 4808 | * Check if the process should be allowed to relabel packets to @secid.
|
| 4809 | *
|
| 4810 | * Return: Returns 0 if permission is granted.
|
| 4811 |
|
| 4812 | int security_secmark_relabel_packet(u32 secid)
|
| 4813 | {
|
| 4814 | return call_int_hook(secmark_relabel_packet, 0, secid);
|
| 4815 | }
|
| 4816 | EXPORT_SYMBOL(security_secmark_relabel_packet);
|
| 4817 |
|
| 4818 | |
| 4819 | * security_secmark_refcount_inc() - Increment the secmark labeling rule count
|
| 4820 | *
|
| 4821 | * Tells the LSM to increment the number of secmark labeling rules loaded.
|
| 4822 |
|
| 4823 | void security_secmark_refcount_inc(void)
|
| 4824 | {
|
| 4825 | call_void_hook(secmark_refcount_inc);
|
| 4826 | }
|
| 4827 | EXPORT_SYMBOL(security_secmark_refcount_inc);
|
| 4828 |
|
| 4829 | |
| 4830 | * security_secmark_refcount_dec() - Decrement the secmark labeling rule count
|
| 4831 | *
|
| 4832 | * Tells the LSM to decrement the number of secmark labeling rules loaded.
|
| 4833 |
|
| 4834 | void security_secmark_refcount_dec(void)
|
| 4835 | {
|
| 4836 | call_void_hook(secmark_refcount_dec);
|
| 4837 | }
|
| 4838 | EXPORT_SYMBOL(security_secmark_refcount_dec);
|
| 4839 |
|
| 4840 | |
| 4841 | * security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device
|
| 4842 | * @security: pointer to the LSM blob
|
| 4843 | *
|
| 4844 | * This hook allows a module to allocate a security structure for a TUN device,
|
| 4845 | * returning the pointer in @security.
|
| 4846 | *
|
| 4847 | * Return: Returns a zero on success, negative values on failure.
|
| 4848 |
|
| 4849 | int security_tun_dev_alloc_security(void **security)
|
| 4850 | {
|
| 4851 | return call_int_hook(tun_dev_alloc_security, 0, security);
|
| 4852 | }
|
| 4853 | EXPORT_SYMBOL(security_tun_dev_alloc_security);
|
| 4854 |
|
| 4855 | |
| 4856 | * security_tun_dev_free_security() - Free a TUN device LSM blob
|
| 4857 | * @security: LSM blob
|
| 4858 | *
|
| 4859 | * This hook allows a module to free the security structure for a TUN device.
|
| 4860 |
|
| 4861 | void security_tun_dev_free_security(void *security)
|
| 4862 | {
|
| 4863 | call_void_hook(tun_dev_free_security, security);
|
| 4864 | }
|
| 4865 | EXPORT_SYMBOL(security_tun_dev_free_security);
|
| 4866 |
|
| 4867 | |
| 4868 | * security_tun_dev_create() - Check if creating a TUN device is allowed
|
| 4869 | *
|
| 4870 | * Check permissions prior to creating a new TUN device.
|
| 4871 | *
|
| 4872 | * Return: Returns 0 if permission is granted.
|
| 4873 |
|
| 4874 | int security_tun_dev_create(void)
|
| 4875 | {
|
| 4876 | return call_int_hook(tun_dev_create, 0);
|
| 4877 | }
|
| 4878 | EXPORT_SYMBOL(security_tun_dev_create);
|
| 4879 |
|
| 4880 | |
| 4881 | * security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed
|
| 4882 | * @security: TUN device LSM blob
|
| 4883 | *
|
| 4884 | * Check permissions prior to attaching to a TUN device queue.
|
| 4885 | *
|
| 4886 | * Return: Returns 0 if permission is granted.
|
| 4887 |
|
| 4888 | int security_tun_dev_attach_queue(void *security)
|
| 4889 | {
|
| 4890 | return call_int_hook(tun_dev_attach_queue, 0, security);
|
| 4891 | }
|
| 4892 | EXPORT_SYMBOL(security_tun_dev_attach_queue);
|
| 4893 |
|
| 4894 | |
| 4895 | * security_tun_dev_attach() - Update TUN device LSM state on attach
|
| 4896 | * @sk: associated sock
|
| 4897 | * @security: TUN device LSM blob
|
| 4898 | *
|
| 4899 | * This hook can be used by the module to update any security state associated
|
| 4900 | * with the TUN device's sock structure.
|
| 4901 | *
|
| 4902 | * Return: Returns 0 if permission is granted.
|
| 4903 |
|
| 4904 | int security_tun_dev_attach(struct sock *sk, void *security)
|
| 4905 | {
|
| 4906 | return call_int_hook(tun_dev_attach, 0, sk, security);
|
| 4907 | }
|
| 4908 | EXPORT_SYMBOL(security_tun_dev_attach);
|
| 4909 |
|
| 4910 | |
| 4911 | * security_tun_dev_open() - Update TUN device LSM state on open
|
| 4912 | * @security: TUN device LSM blob
|
| 4913 | *
|
| 4914 | * This hook can be used by the module to update any security state associated
|
| 4915 | * with the TUN device's security structure.
|
| 4916 | *
|
| 4917 | * Return: Returns 0 if permission is granted.
|
| 4918 |
|
| 4919 | int security_tun_dev_open(void *security)
|
| 4920 | {
|
| 4921 | return call_int_hook(tun_dev_open, 0, security);
|
| 4922 | }
|
| 4923 | EXPORT_SYMBOL(security_tun_dev_open);
|
| 4924 |
|
| 4925 | |
| 4926 | * security_sctp_assoc_request() - Update the LSM on a SCTP association req
|
| 4927 | * @asoc: SCTP association
|
| 4928 | * @skb: packet requesting the association
|
| 4929 | *
|
| 4930 | * Passes the @asoc and @chunk->skb of the association INIT packet to the LSM.
|
| 4931 | *
|
| 4932 | * Return: Returns 0 on success, error on failure.
|
| 4933 |
|
| 4934 | int security_sctp_assoc_request(struct sctp_association *asoc,
|
| 4935 | struct sk_buff *skb)
|
| 4936 | {
|
| 4937 | return call_int_hook(sctp_assoc_request, 0, asoc, skb);
|
| 4938 | }
|
| 4939 | EXPORT_SYMBOL(security_sctp_assoc_request);
|
| 4940 |
|
| 4941 | |
| 4942 | * security_sctp_bind_connect() - Validate a list of addrs for a SCTP option
|
| 4943 | * @sk: socket
|
| 4944 | * @optname: SCTP option to validate
|
| 4945 | * @address: list of IP addresses to validate
|
| 4946 | * @addrlen: length of the address list
|
| 4947 | *
|
| 4948 | * Validiate permissions required for each address associated with sock @sk.
|
| 4949 | * Depending on @optname, the addresses will be treated as either a connect or
|
| 4950 | * bind service. The @addrlen is calculated on each IPv4 and IPv6 address using
|
| 4951 | * sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6).
|
| 4952 | *
|
| 4953 | * Return: Returns 0 on success, error on failure.
|
| 4954 |
|
| 4955 | int security_sctp_bind_connect(struct sock *sk, int optname,
|
| 4956 | struct sockaddr *address, int addrlen)
|
| 4957 | {
|
| 4958 | return call_int_hook(sctp_bind_connect, 0, sk, optname,
|
| 4959 | address, addrlen);
|
| 4960 | }
|
| 4961 | EXPORT_SYMBOL(security_sctp_bind_connect);
|
| 4962 |
|
| 4963 | |
| 4964 | * security_sctp_sk_clone() - Clone a SCTP sock's LSM state
|
| 4965 | * @asoc: SCTP association
|
| 4966 | * @sk: original sock
|
| 4967 | * @newsk: target sock
|
| 4968 | *
|
| 4969 | * Called whenever a new socket is created by accept(2) (i.e. a TCP style
|
| 4970 | * socket) or when a socket is 'peeled off' e.g userspace calls
|
| 4971 | * sctp_peeloff(3).
|
| 4972 |
|
| 4973 | void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
|
| 4974 | struct sock *newsk)
|
| 4975 | {
|
| 4976 | call_void_hook(sctp_sk_clone, asoc, sk, newsk);
|
| 4977 | }
|
| 4978 | EXPORT_SYMBOL(security_sctp_sk_clone);
|
| 4979 |
|
| 4980 | |
| 4981 | * security_sctp_assoc_established() - Update LSM state when assoc established
|
| 4982 | * @asoc: SCTP association
|
| 4983 | * @skb: packet establishing the association
|
| 4984 | *
|
| 4985 | * Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the
|
| 4986 | * security module.
|
| 4987 | *
|
| 4988 | * Return: Returns 0 if permission is granted.
|
| 4989 |
|
| 4990 | int security_sctp_assoc_established(struct sctp_association *asoc,
|
| 4991 | struct sk_buff *skb)
|
| 4992 | {
|
| 4993 | return call_int_hook(sctp_assoc_established, 0, asoc, skb);
|
| 4994 | }
|
| 4995 | EXPORT_SYMBOL(security_sctp_assoc_established);
|
| 4996 |
|
| 4997 | |
| 4998 | * security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket
|
| 4999 | * @sk: the owning MPTCP socket
|
| 5000 | * @ssk: the new subflow
|
| 5001 | *
|
| 5002 | * Update the labeling for the given MPTCP subflow, to match the one of the
|
| 5003 | * owning MPTCP socket. This hook has to be called after the socket creation and
|
| 5004 | * initialization via the security_socket_create() and
|
| 5005 | * security_socket_post_create() LSM hooks.
|
| 5006 | *
|
| 5007 | * Return: Returns 0 on success or a negative error code on failure.
|
| 5008 |
|
| 5009 | int security_mptcp_add_subflow(struct sock *sk, struct sock *ssk)
|
| 5010 | {
|
| 5011 | return call_int_hook(mptcp_add_subflow, 0, sk, ssk);
|
| 5012 | }
|
| 5013 |
|
| 5014 | #endif
|
| 5015 |
|
| 5016 | #ifdef CONFIG_SECURITY_INFINIBAND
|
| 5017 | |
| 5018 | * security_ib_pkey_access() - Check if access to an IB pkey is allowed
|
| 5019 | * @sec: LSM blob
|
| 5020 | * @subnet_prefix: subnet prefix of the port
|
| 5021 | * @pkey: IB pkey
|
| 5022 | *
|
| 5023 | * Check permission to access a pkey when modifying a QP.
|
| 5024 | *
|
| 5025 | * Return: Returns 0 if permission is granted.
|
| 5026 |
|
| 5027 | int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey)
|
| 5028 | {
|
| 5029 | return call_int_hook(ib_pkey_access, 0, sec, subnet_prefix, pkey);
|
| 5030 | }
|
| 5031 | EXPORT_SYMBOL(security_ib_pkey_access);
|
| 5032 |
|
| 5033 | |
| 5034 | * security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed
|
| 5035 | * @sec: LSM blob
|
| 5036 | * @dev_name: IB device name
|
| 5037 | * @port_num: port number
|
| 5038 | *
|
| 5039 | * Check permissions to send and receive SMPs on a end port.
|
| 5040 | *
|
| 5041 | * Return: Returns 0 if permission is granted.
|
| 5042 |
|
| 5043 | int security_ib_endport_manage_subnet(void *sec,
|
| 5044 | const char *dev_name, u8 port_num)
|
| 5045 | {
|
| 5046 | return call_int_hook(ib_endport_manage_subnet, 0, sec,
|
| 5047 | dev_name, port_num);
|
| 5048 | }
|
| 5049 | EXPORT_SYMBOL(security_ib_endport_manage_subnet);
|
| 5050 |
|
| 5051 | |
| 5052 | * security_ib_alloc_security() - Allocate an Infiniband LSM blob
|
| 5053 | * @sec: LSM blob
|
| 5054 | *
|
| 5055 | * Allocate a security structure for Infiniband objects.
|
| 5056 | *
|
| 5057 | * Return: Returns 0 on success, non-zero on failure.
|
| 5058 |
|
| 5059 | int security_ib_alloc_security(void **sec)
|
| 5060 | {
|
| 5061 | return call_int_hook(ib_alloc_security, 0, sec);
|
| 5062 | }
|
| 5063 | EXPORT_SYMBOL(security_ib_alloc_security);
|
| 5064 |
|
| 5065 | |
| 5066 | * security_ib_free_security() - Free an Infiniband LSM blob
|
| 5067 | * @sec: LSM blob
|
| 5068 | *
|
| 5069 | * Deallocate an Infiniband security structure.
|
| 5070 |
|
| 5071 | void security_ib_free_security(void *sec)
|
| 5072 | {
|
| 5073 | call_void_hook(ib_free_security, sec);
|
| 5074 | }
|
| 5075 | EXPORT_SYMBOL(security_ib_free_security);
|
| 5076 | #endif
|
| 5077 |
|
| 5078 | #ifdef CONFIG_SECURITY_NETWORK_XFRM
|
| 5079 | |
| 5080 | * security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob
|
| 5081 | * @ctxp: xfrm security context being added to the SPD
|
| 5082 | * @sec_ctx: security label provided by userspace
|
| 5083 | * @gfp: gfp flags
|
| 5084 | *
|
| 5085 | * Allocate a security structure to the xp->security field; the security field
|
| 5086 | * is initialized to NULL when the xfrm_policy is allocated.
|
| 5087 | *
|
| 5088 | * Return: Return 0 if operation was successful.
|
| 5089 |
|
| 5090 | int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
|
| 5091 | struct xfrm_user_sec_ctx *sec_ctx,
|
| 5092 | gfp_t gfp)
|
| 5093 | {
|
| 5094 | return call_int_hook(xfrm_policy_alloc_security, 0, ctxp, sec_ctx, gfp);
|
| 5095 | }
|
| 5096 | EXPORT_SYMBOL(security_xfrm_policy_alloc);
|
| 5097 |
|
| 5098 | |
| 5099 | * security_xfrm_policy_clone() - Clone xfrm policy LSM state
|
| 5100 | * @old_ctx: xfrm security context
|
| 5101 | * @new_ctxp: target xfrm security context
|
| 5102 | *
|
| 5103 | * Allocate a security structure in new_ctxp that contains the information from
|
| 5104 | * the old_ctx structure.
|
| 5105 | *
|
| 5106 | * Return: Return 0 if operation was successful.
|
| 5107 |
|
| 5108 | int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
|
| 5109 | struct xfrm_sec_ctx **new_ctxp)
|
| 5110 | {
|
| 5111 | return call_int_hook(xfrm_policy_clone_security, 0, old_ctx, new_ctxp);
|
| 5112 | }
|
| 5113 |
|
| 5114 | |
| 5115 | * security_xfrm_policy_free() - Free a xfrm security context
|
| 5116 | * @ctx: xfrm security context
|
| 5117 | *
|
| 5118 | * Free LSM resources associated with @ctx.
|
| 5119 |
|
| 5120 | void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
|
| 5121 | {
|
| 5122 | call_void_hook(xfrm_policy_free_security, ctx);
|
| 5123 | }
|
| 5124 | EXPORT_SYMBOL(security_xfrm_policy_free);
|
| 5125 |
|
| 5126 | |
| 5127 | * security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed
|
| 5128 | * @ctx: xfrm security context
|
| 5129 | *
|
| 5130 | * Authorize deletion of a SPD entry.
|
| 5131 | *
|
| 5132 | * Return: Returns 0 if permission is granted.
|
| 5133 |
|
| 5134 | int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
|
| 5135 | {
|
| 5136 | return call_int_hook(xfrm_policy_delete_security, 0, ctx);
|
| 5137 | }
|
| 5138 |
|
| 5139 | |
| 5140 | * security_xfrm_state_alloc() - Allocate a xfrm state LSM blob
|
| 5141 | * @x: xfrm state being added to the SAD
|
| 5142 | * @sec_ctx: security label provided by userspace
|
| 5143 | *
|
| 5144 | * Allocate a security structure to the @x->security field; the security field
|
| 5145 | * is initialized to NULL when the xfrm_state is allocated. Set the context to
|
| 5146 | * correspond to @sec_ctx.
|
| 5147 | *
|
| 5148 | * Return: Return 0 if operation was successful.
|
| 5149 |
|
| 5150 | int security_xfrm_state_alloc(struct xfrm_state *x,
|
| 5151 | struct xfrm_user_sec_ctx *sec_ctx)
|
| 5152 | {
|
| 5153 | return call_int_hook(xfrm_state_alloc, 0, x, sec_ctx);
|
| 5154 | }
|
| 5155 | EXPORT_SYMBOL(security_xfrm_state_alloc);
|
| 5156 |
|
| 5157 | |
| 5158 | * security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob
|
| 5159 | * @x: xfrm state being added to the SAD
|
| 5160 | * @polsec: associated policy's security context
|
| 5161 | * @secid: secid from the flow
|
| 5162 | *
|
| 5163 | * Allocate a security structure to the x->security field; the security field
|
| 5164 | * is initialized to NULL when the xfrm_state is allocated. Set the context to
|
| 5165 | * correspond to secid.
|
| 5166 | *
|
| 5167 | * Return: Returns 0 if operation was successful.
|
| 5168 |
|
| 5169 | int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
|
| 5170 | struct xfrm_sec_ctx *polsec, u32 secid)
|
| 5171 | {
|
| 5172 | return call_int_hook(xfrm_state_alloc_acquire, 0, x, polsec, secid);
|
| 5173 | }
|
| 5174 |
|
| 5175 | |
| 5176 | * security_xfrm_state_delete() - Check if deleting a xfrm state is allowed
|
| 5177 | * @x: xfrm state
|
| 5178 | *
|
| 5179 | * Authorize deletion of x->security.
|
| 5180 | *
|
| 5181 | * Return: Returns 0 if permission is granted.
|
| 5182 |
|
| 5183 | int security_xfrm_state_delete(struct xfrm_state *x)
|
| 5184 | {
|
| 5185 | return call_int_hook(xfrm_state_delete_security, 0, x);
|
| 5186 | }
|
| 5187 | EXPORT_SYMBOL(security_xfrm_state_delete);
|
| 5188 |
|
| 5189 | |
| 5190 | * security_xfrm_state_free() - Free a xfrm state
|
| 5191 | * @x: xfrm state
|
| 5192 | *
|
| 5193 | * Deallocate x->security.
|
| 5194 |
|
| 5195 | void security_xfrm_state_free(struct xfrm_state *x)
|
| 5196 | {
|
| 5197 | call_void_hook(xfrm_state_free_security, x);
|
| 5198 | }
|
| 5199 |
|
| 5200 | |
| 5201 | * security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed
|
| 5202 | * @ctx: target xfrm security context
|
| 5203 | * @fl_secid: flow secid used to authorize access
|
| 5204 | *
|
| 5205 | * Check permission when a flow selects a xfrm_policy for processing XFRMs on a
|
| 5206 | * packet. The hook is called when selecting either a per-socket policy or a
|
| 5207 | * generic xfrm policy.
|
| 5208 | *
|
| 5209 | * Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on
|
| 5210 | * other errors.
|
| 5211 |
|
| 5212 | int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
|
| 5213 | {
|
| 5214 | return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid);
|
| 5215 | }
|
| 5216 |
|
| 5217 | |
| 5218 | * security_xfrm_state_pol_flow_match() - Check for a xfrm match
|
| 5219 | * @x: xfrm state to match
|
| 5220 | * @xp: xfrm policy to check for a match
|
| 5221 | * @flic: flow to check for a match.
|
| 5222 | *
|
| 5223 | * Check @xp and @flic for a match with @x.
|
| 5224 | *
|
| 5225 | * Return: Returns 1 if there is a match.
|
| 5226 |
|
| 5227 | int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
|
| 5228 | struct xfrm_policy *xp,
|
| 5229 | const struct flowi_common *flic)
|
| 5230 | {
|
| 5231 | struct security_hook_list *hp;
|
| 5232 | int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match);
|
| 5233 |
|
| 5234 | |
| 5235 | * Since this function is expected to return 0 or 1, the judgment
|
| 5236 | * becomes difficult if multiple LSMs supply this call. Fortunately,
|
| 5237 | * we can use the first LSM's judgment because currently only SELinux
|
| 5238 | * supplies this call.
|
| 5239 | *
|
| 5240 | * For speed optimization, we explicitly break the loop rather than
|
| 5241 | * using the macro
|
| 5242 |
|
| 5243 | hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
|
| 5244 | list) {
|
| 5245 | rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic);
|
| 5246 | break;
|
| 5247 | }
|
| 5248 | return rc;
|
| 5249 | }
|
| 5250 |
|
| 5251 | |
| 5252 | * security_xfrm_decode_session() - Determine the xfrm secid for a packet
|
| 5253 | * @skb: xfrm packet
|
| 5254 | * @secid: secid
|
| 5255 | *
|
| 5256 | * Decode the packet in @skb and return the security label in @secid.
|
| 5257 | *
|
| 5258 | * Return: Return 0 if all xfrms used have the same secid.
|
| 5259 |
|
| 5260 | int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
|
| 5261 | {
|
| 5262 | return call_int_hook(xfrm_decode_session, 0, skb, secid, 1);
|
| 5263 | }
|
| 5264 |
|
| 5265 | void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic)
|
| 5266 | {
|
| 5267 | int rc = call_int_hook(xfrm_decode_session, 0, skb, &flic->flowic_secid,
|
| 5268 | 0);
|
| 5269 |
|
| 5270 | BUG_ON(rc);
|
| 5271 | }
|
| 5272 | EXPORT_SYMBOL(security_skb_classify_flow);
|
| 5273 | #endif
|
| 5274 |
|
| 5275 | #ifdef CONFIG_KEYS
|
| 5276 | |
| 5277 | * security_key_alloc() - Allocate and initialize a kernel key LSM blob
|
| 5278 | * @key: key
|
| 5279 | * @cred: credentials
|
| 5280 | * @flags: allocation flags
|
| 5281 | *
|
| 5282 | * Permit allocation of a key and assign security data. Note that key does not
|
| 5283 | * have a serial number assigned at this point.
|
| 5284 | *
|
| 5285 | * Return: Return 0 if permission is granted, -ve error otherwise.
|
| 5286 |
|
| 5287 | int security_key_alloc(struct key *key, const struct cred *cred,
|
| 5288 | unsigned long flags)
|
| 5289 | {
|
| 5290 | return call_int_hook(key_alloc, 0, key, cred, flags);
|
| 5291 | }
|
| 5292 |
|
| 5293 | |
| 5294 | * security_key_free() - Free a kernel key LSM blob
|
| 5295 | * @key: key
|
| 5296 | *
|
| 5297 | * Notification of destruction; free security data.
|
| 5298 |
|
| 5299 | void security_key_free(struct key *key)
|
| 5300 | {
|
| 5301 | call_void_hook(key_free, key);
|
| 5302 | }
|
| 5303 |
|
| 5304 | |
| 5305 | * security_key_permission() - Check if a kernel key operation is allowed
|
| 5306 | * @key_ref: key reference
|
| 5307 | * @cred: credentials of actor requesting access
|
| 5308 | * @need_perm: requested permissions
|
| 5309 | *
|
| 5310 | * See whether a specific operational right is granted to a process on a key.
|
| 5311 | *
|
| 5312 | * Return: Return 0 if permission is granted, -ve error otherwise.
|
| 5313 |
|
| 5314 | int security_key_permission(key_ref_t key_ref, const struct cred *cred,
|
| 5315 | enum key_need_perm need_perm)
|
| 5316 | {
|
| 5317 | return call_int_hook(key_permission, 0, key_ref, cred, need_perm);
|
| 5318 | }
|
| 5319 |
|
| 5320 | |
| 5321 | * security_key_getsecurity() - Get the key's security label
|
| 5322 | * @key: key
|
| 5323 | * @buffer: security label buffer
|
| 5324 | *
|
| 5325 | * Get a textual representation of the security context attached to a key for
|
| 5326 | * the purposes of honouring KEYCTL_GETSECURITY. This function allocates the
|
| 5327 | * storage for the NUL-terminated string and the caller should free it.
|
| 5328 | *
|
| 5329 | * Return: Returns the length of @buffer (including terminating NUL) or -ve if
|
| 5330 | * an error occurs. May also return 0 (and a NULL buffer pointer) if
|
| 5331 | * there is no security label assigned to the key.
|
| 5332 |
|
| 5333 | int security_key_getsecurity(struct key *key, char **buffer)
|
| 5334 | {
|
| 5335 | *buffer = NULL;
|
| 5336 | return call_int_hook(key_getsecurity, 0, key, buffer);
|
| 5337 | }
|
| 5338 | #endif
|
| 5339 |
|
| 5340 | #ifdef CONFIG_AUDIT
|
| 5341 | |
| 5342 | * security_audit_rule_init() - Allocate and init an LSM audit rule struct
|
| 5343 | * @field: audit action
|
| 5344 | * @op: rule operator
|
| 5345 | * @rulestr: rule context
|
| 5346 | * @lsmrule: receive buffer for audit rule struct
|
| 5347 | *
|
| 5348 | * Allocate and initialize an LSM audit rule structure.
|
| 5349 | *
|
| 5350 | * Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of
|
| 5351 | * an invalid rule.
|
| 5352 |
|
| 5353 | int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
|
| 5354 | {
|
| 5355 | return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule);
|
| 5356 | }
|
| 5357 |
|
| 5358 | |
| 5359 | * security_audit_rule_known() - Check if an audit rule contains LSM fields
|
| 5360 | * @krule: audit rule
|
| 5361 | *
|
| 5362 | * Specifies whether given @krule contains any fields related to the current
|
| 5363 | * LSM.
|
| 5364 | *
|
| 5365 | * Return: Returns 1 in case of relation found, 0 otherwise.
|
| 5366 |
|
| 5367 | int security_audit_rule_known(struct audit_krule *krule)
|
| 5368 | {
|
| 5369 | return call_int_hook(audit_rule_known, 0, krule);
|
| 5370 | }
|
| 5371 |
|
| 5372 | |
| 5373 | * security_audit_rule_free() - Free an LSM audit rule struct
|
| 5374 | * @lsmrule: audit rule struct
|
| 5375 | *
|
| 5376 | * Deallocate the LSM audit rule structure previously allocated by
|
| 5377 | * audit_rule_init().
|
| 5378 |
|
| 5379 | void security_audit_rule_free(void *lsmrule)
|
| 5380 | {
|
| 5381 | call_void_hook(audit_rule_free, lsmrule);
|
| 5382 | }
|
| 5383 |
|
| 5384 | |
| 5385 | * security_audit_rule_match() - Check if a label matches an audit rule
|
| 5386 | * @secid: security label
|
| 5387 | * @field: LSM audit field
|
| 5388 | * @op: matching operator
|
| 5389 | * @lsmrule: audit rule
|
| 5390 | *
|
| 5391 | * Determine if given @secid matches a rule previously approved by
|
| 5392 | * security_audit_rule_known().
|
| 5393 | *
|
| 5394 | * Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on
|
| 5395 | * failure.
|
| 5396 |
|
| 5397 | int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule)
|
| 5398 | {
|
| 5399 | return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule);
|
| 5400 | }
|
| 5401 | #endif
|
| 5402 |
|
| 5403 | #ifdef CONFIG_BPF_SYSCALL
|
| 5404 | |
| 5405 | * security_bpf() - Check if the bpf syscall operation is allowed
|
| 5406 | * @cmd: command
|
| 5407 | * @attr: bpf attribute
|
| 5408 | * @size: size
|
| 5409 | *
|
| 5410 | * Do a initial check for all bpf syscalls after the attribute is copied into
|
| 5411 | * the kernel. The actual security module can implement their own rules to
|
| 5412 | * check the specific cmd they need.
|
| 5413 | *
|
| 5414 | * Return: Returns 0 if permission is granted.
|
| 5415 |
|
| 5416 | int security_bpf(int cmd, union bpf_attr *attr, unsigned int size)
|
| 5417 | {
|
| 5418 | return call_int_hook(bpf, 0, cmd, attr, size);
|
| 5419 | }
|
| 5420 |
|
| 5421 | |
| 5422 | * security_bpf_map() - Check if access to a bpf map is allowed
|
| 5423 | * @map: bpf map
|
| 5424 | * @fmode: mode
|
| 5425 | *
|
| 5426 | * Do a check when the kernel generates and returns a file descriptor for eBPF
|
| 5427 | * maps.
|
| 5428 | *
|
| 5429 | * Return: Returns 0 if permission is granted.
|
| 5430 |
|
| 5431 | int security_bpf_map(struct bpf_map *map, fmode_t fmode)
|
| 5432 | {
|
| 5433 | return call_int_hook(bpf_map, 0, map, fmode);
|
| 5434 | }
|
| 5435 |
|
| 5436 | |
| 5437 | * security_bpf_prog() - Check if access to a bpf program is allowed
|
| 5438 | * @prog: bpf program
|
| 5439 | *
|
| 5440 | * Do a check when the kernel generates and returns a file descriptor for eBPF
|
| 5441 | * programs.
|
| 5442 | *
|
| 5443 | * Return: Returns 0 if permission is granted.
|
| 5444 |
|
| 5445 | int security_bpf_prog(struct bpf_prog *prog)
|
| 5446 | {
|
| 5447 | return call_int_hook(bpf_prog, 0, prog);
|
| 5448 | }
|
| 5449 |
|
| 5450 | |
| 5451 | * security_bpf_map_alloc() - Allocate a bpf map LSM blob
|
| 5452 | * @map: bpf map
|
| 5453 | *
|
| 5454 | * Initialize the security field inside bpf map.
|
| 5455 | *
|
| 5456 | * Return: Returns 0 on success, error on failure.
|
| 5457 |
|
| 5458 | int security_bpf_map_alloc(struct bpf_map *map)
|
| 5459 | {
|
| 5460 | return call_int_hook(bpf_map_alloc_security, 0, map);
|
| 5461 | }
|
| 5462 |
|
| 5463 | |
| 5464 | * security_bpf_prog_alloc() - Allocate a bpf program LSM blob
|
| 5465 | * @aux: bpf program aux info struct
|
| 5466 | *
|
| 5467 | * Initialize the security field inside bpf program.
|
| 5468 | *
|
| 5469 | * Return: Returns 0 on success, error on failure.
|
| 5470 |
|
| 5471 | int security_bpf_prog_alloc(struct bpf_prog_aux *aux)
|
| 5472 | {
|
| 5473 | return call_int_hook(bpf_prog_alloc_security, 0, aux);
|
| 5474 | }
|
| 5475 |
|
| 5476 | |
| 5477 | * security_bpf_map_free() - Free a bpf map's LSM blob
|
| 5478 | * @map: bpf map
|
| 5479 | *
|
| 5480 | * Clean up the security information stored inside bpf map.
|
| 5481 |
|
| 5482 | void security_bpf_map_free(struct bpf_map *map)
|
| 5483 | {
|
| 5484 | call_void_hook(bpf_map_free_security, map);
|
| 5485 | }
|
| 5486 |
|
| 5487 | |
| 5488 | * security_bpf_prog_free() - Free a bpf program's LSM blob
|
| 5489 | * @aux: bpf program aux info struct
|
| 5490 | *
|
| 5491 | * Clean up the security information stored inside bpf prog.
|
| 5492 |
|
| 5493 | void security_bpf_prog_free(struct bpf_prog_aux *aux)
|
| 5494 | {
|
| 5495 | call_void_hook(bpf_prog_free_security, aux);
|
| 5496 | }
|
| 5497 | #endif
|
| 5498 |
|
| 5499 | |
| 5500 | * security_locked_down() - Check if a kernel feature is allowed
|
| 5501 | * @what: requested kernel feature
|
| 5502 | *
|
| 5503 | * Determine whether a kernel feature that potentially enables arbitrary code
|
| 5504 | * execution in kernel space should be permitted.
|
| 5505 | *
|
| 5506 | * Return: Returns 0 if permission is granted.
|
| 5507 |
|
| 5508 | int security_locked_down(enum lockdown_reason what)
|
| 5509 | {
|
| 5510 | return call_int_hook(locked_down, 0, what);
|
| 5511 | }
|
| 5512 | EXPORT_SYMBOL(security_locked_down);
|
| 5513 |
|
| 5514 | #ifdef CONFIG_PERF_EVENTS
|
| 5515 | |
| 5516 | * security_perf_event_open() - Check if a perf event open is allowed
|
| 5517 | * @attr: perf event attribute
|
| 5518 | * @type: type of event
|
| 5519 | *
|
| 5520 | * Check whether the @type of perf_event_open syscall is allowed.
|
| 5521 | *
|
| 5522 | * Return: Returns 0 if permission is granted.
|
| 5523 |
|
| 5524 | int security_perf_event_open(struct perf_event_attr *attr, int type)
|
| 5525 | {
|
| 5526 | return call_int_hook(perf_event_open, 0, attr, type);
|
| 5527 | }
|
| 5528 |
|
| 5529 | |
| 5530 | * security_perf_event_alloc() - Allocate a perf event LSM blob
|
| 5531 | * @event: perf event
|
| 5532 | *
|
| 5533 | * Allocate and save perf_event security info.
|
| 5534 | *
|
| 5535 | * Return: Returns 0 on success, error on failure.
|
| 5536 |
|
| 5537 | int security_perf_event_alloc(struct perf_event *event)
|
| 5538 | {
|
| 5539 | return call_int_hook(perf_event_alloc, 0, event);
|
| 5540 | }
|
| 5541 |
|
| 5542 | |
| 5543 | * security_perf_event_free() - Free a perf event LSM blob
|
| 5544 | * @event: perf event
|
| 5545 | *
|
| 5546 | * Release (free) perf_event security info.
|
| 5547 |
|
| 5548 | void security_perf_event_free(struct perf_event *event)
|
| 5549 | {
|
| 5550 | call_void_hook(perf_event_free, event);
|
| 5551 | }
|
| 5552 |
|
| 5553 | |
| 5554 | * security_perf_event_read() - Check if reading a perf event label is allowed
|
| 5555 | * @event: perf event
|
| 5556 | *
|
| 5557 | * Read perf_event security info if allowed.
|
| 5558 | *
|
| 5559 | * Return: Returns 0 if permission is granted.
|
| 5560 |
|
| 5561 | int security_perf_event_read(struct perf_event *event)
|
| 5562 | {
|
| 5563 | return call_int_hook(perf_event_read, 0, event);
|
| 5564 | }
|
| 5565 |
|
| 5566 | |
| 5567 | * security_perf_event_write() - Check if writing a perf event label is allowed
|
| 5568 | * @event: perf event
|
| 5569 | *
|
| 5570 | * Write perf_event security info if allowed.
|
| 5571 | *
|
| 5572 | * Return: Returns 0 if permission is granted.
|
| 5573 |
|
| 5574 | int security_perf_event_write(struct perf_event *event)
|
| 5575 | {
|
| 5576 | return call_int_hook(perf_event_write, 0, event);
|
| 5577 | }
|
| 5578 | #endif
|
| 5579 |
|
| 5580 | #ifdef CONFIG_IO_URING
|
| 5581 | |
| 5582 | * security_uring_override_creds() - Check if overriding creds is allowed
|
| 5583 | * @new: new credentials
|
| 5584 | *
|
| 5585 | * Check if the current task, executing an io_uring operation, is allowed to
|
| 5586 | * override it's credentials with @new.
|
| 5587 | *
|
| 5588 | * Return: Returns 0 if permission is granted.
|
| 5589 |
|
| 5590 | int security_uring_override_creds(const struct cred *new)
|
| 5591 | {
|
| 5592 | return call_int_hook(uring_override_creds, 0, new);
|
| 5593 | }
|
| 5594 |
|
| 5595 | |
| 5596 | * security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed
|
| 5597 | *
|
| 5598 | * Check whether the current task is allowed to spawn a io_uring polling thread
|
| 5599 | * (IORING_SETUP_SQPOLL).
|
| 5600 | *
|
| 5601 | * Return: Returns 0 if permission is granted.
|
| 5602 |
|
| 5603 | int security_uring_sqpoll(void)
|
| 5604 | {
|
| 5605 | return call_int_hook(uring_sqpoll, 0);
|
| 5606 | }
|
| 5607 |
|
| 5608 | |
| 5609 | * security_uring_cmd() - Check if a io_uring passthrough command is allowed
|
| 5610 | * @ioucmd: command
|
| 5611 | *
|
| 5612 | * Check whether the file_operations uring_cmd is allowed to run.
|
| 5613 | *
|
| 5614 | * Return: Returns 0 if permission is granted.
|
| 5615 |
|
| 5616 | int security_uring_cmd(struct io_uring_cmd *ioucmd)
|
| 5617 | {
|
| 5618 | return call_int_hook(uring_cmd, 0, ioucmd);
|
| 5619 | }
|
| 5620 | #endif
|