| 1 | |
| 2 | |
| 3 | * sysctl.c: General linux system control interface
|
| 4 | *
|
| 5 | * Begun 24 March 1995, Stephen Tweedie
|
| 6 | * Added /proc support, Dec 1995
|
| 7 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
|
| 8 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
|
| 9 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
|
| 10 | * Dynamic registration fixes, Stephen Tweedie.
|
| 11 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
|
| 12 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
|
| 13 | * Horn.
|
| 14 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
|
| 15 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
|
| 16 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
|
| 17 | * Wendling.
|
| 18 | * The list_for_each() macro wasn't appropriate for the sysctl loop.
|
| 19 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling
|
| 20 |
|
| 21 |
|
| 22 | #include <linux/module.h>
|
| 23 | #include <linux/mm.h>
|
| 24 | #include <linux/swap.h>
|
| 25 | #include <linux/slab.h>
|
| 26 | #include <linux/sysctl.h>
|
| 27 | #include <linux/bitmap.h>
|
| 28 | #include <linux/signal.h>
|
| 29 | #include <linux/panic.h>
|
| 30 | #include <linux/printk.h>
|
| 31 | #include <linux/proc_fs.h>
|
| 32 | #include <linux/security.h>
|
| 33 | #include <linux/ctype.h>
|
| 34 | #include <linux/kmemleak.h>
|
| 35 | #include <linux/filter.h>
|
| 36 | #include <linux/fs.h>
|
| 37 | #include <linux/init.h>
|
| 38 | #include <linux/kernel.h>
|
| 39 | #include <linux/kobject.h>
|
| 40 | #include <linux/net.h>
|
| 41 | #include <linux/sysrq.h>
|
| 42 | #include <linux/highuid.h>
|
| 43 | #include <linux/writeback.h>
|
| 44 | #include <linux/ratelimit.h>
|
| 45 | #include <linux/compaction.h>
|
| 46 | #include <linux/hugetlb.h>
|
| 47 | #include <linux/initrd.h>
|
| 48 | #include <linux/key.h>
|
| 49 | #include <linux/times.h>
|
| 50 | #include <linux/limits.h>
|
| 51 | #include <linux/dcache.h>
|
| 52 | #include <linux/syscalls.h>
|
| 53 | #include <linux/vmstat.h>
|
| 54 | #include <linux/nfs_fs.h>
|
| 55 | #include <linux/acpi.h>
|
| 56 | #include <linux/reboot.h>
|
| 57 | #include <linux/ftrace.h>
|
| 58 | #include <linux/perf_event.h>
|
| 59 | #include <linux/oom.h>
|
| 60 | #include <linux/kmod.h>
|
| 61 | #include <linux/capability.h>
|
| 62 | #include <linux/binfmts.h>
|
| 63 | #include <linux/sched/sysctl.h>
|
| 64 | #include <linux/mount.h>
|
| 65 | #include <linux/userfaultfd_k.h>
|
| 66 | #include <linux/pid.h>
|
| 67 |
|
| 68 | #include "../lib/kstrtox.h"
|
| 69 |
|
| 70 | #include <linux/uaccess.h>
|
| 71 | #include <asm/processor.h>
|
| 72 |
|
| 73 | #ifdef CONFIG_X86
|
| 74 | #include <asm/nmi.h>
|
| 75 | #include <asm/stacktrace.h>
|
| 76 | #include <asm/io.h>
|
| 77 | #endif
|
| 78 | #ifdef CONFIG_SPARC
|
| 79 | #include <asm/setup.h>
|
| 80 | #endif
|
| 81 | #ifdef CONFIG_RT_MUTEXES
|
| 82 | #include <linux/rtmutex.h>
|
| 83 | #endif
|
| 84 |
|
| 85 |
|
| 86 | const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535, -1 };
|
| 87 | EXPORT_SYMBOL(sysctl_vals);
|
| 88 |
|
| 89 | const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
|
| 90 | EXPORT_SYMBOL_GPL(sysctl_long_vals);
|
| 91 |
|
| 92 | #if defined(CONFIG_SYSCTL)
|
| 93 |
|
| 94 |
|
| 95 |
|
| 96 | #ifdef CONFIG_PERF_EVENTS
|
| 97 | static const int six_hundred_forty_kb = 640 * 1024;
|
| 98 | #endif
|
| 99 |
|
| 100 |
|
| 101 | static const int ngroups_max = NGROUPS_MAX;
|
| 102 | static const int cap_last_cap = CAP_LAST_CAP;
|
| 103 |
|
| 104 | #ifdef CONFIG_PROC_SYSCTL
|
| 105 |
|
| 106 | |
| 107 | * enum sysctl_writes_mode - supported sysctl write modes
|
| 108 | *
|
| 109 | * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
|
| 110 | * to be written, and multiple writes on the same sysctl file descriptor
|
| 111 | * will rewrite the sysctl value, regardless of file position. No warning
|
| 112 | * is issued when the initial position is not 0.
|
| 113 | * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
|
| 114 | * not 0.
|
| 115 | * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
|
| 116 | * file position 0 and the value must be fully contained in the buffer
|
| 117 | * sent to the write syscall. If dealing with strings respect the file
|
| 118 | * position, but restrict this to the max length of the buffer, anything
|
| 119 | * passed the max length will be ignored. Multiple writes will append
|
| 120 | * to the buffer.
|
| 121 | *
|
| 122 | * These write modes control how current file position affects the behavior of
|
| 123 | * updating sysctl values through the proc interface on each write.
|
| 124 |
|
| 125 | enum sysctl_writes_mode {
|
| 126 | SYSCTL_WRITES_LEGACY = -1,
|
| 127 | SYSCTL_WRITES_WARN = 0,
|
| 128 | SYSCTL_WRITES_STRICT = 1,
|
| 129 | };
|
| 130 |
|
| 131 | static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
|
| 132 | #endif
|
| 133 |
|
| 134 | #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
|
| 135 | defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
|
| 136 | int sysctl_legacy_va_layout;
|
| 137 | #endif
|
| 138 |
|
| 139 | #endif
|
| 140 |
|
| 141 | |
| 142 | * /proc/sys support
|
| 143 |
|
| 144 |
|
| 145 | #ifdef CONFIG_PROC_SYSCTL
|
| 146 |
|
| 147 | static int _proc_do_string(char *data, int maxlen, int write,
|
| 148 | char *buffer, size_t *lenp, loff_t *ppos)
|
| 149 | {
|
| 150 | size_t len;
|
| 151 | char c, *p;
|
| 152 |
|
| 153 | if (!data || !maxlen || !*lenp) {
|
| 154 | *lenp = 0;
|
| 155 | return 0;
|
| 156 | }
|
| 157 |
|
| 158 | if (write) {
|
| 159 | if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
|
| 160 |
|
| 161 | len = strlen(data);
|
| 162 | if (len > maxlen - 1)
|
| 163 | len = maxlen - 1;
|
| 164 |
|
| 165 | if (*ppos > len)
|
| 166 | return 0;
|
| 167 | len = *ppos;
|
| 168 | } else {
|
| 169 |
|
| 170 | len = 0;
|
| 171 | }
|
| 172 |
|
| 173 | *ppos += *lenp;
|
| 174 | p = buffer;
|
| 175 | while ((p - buffer) < *lenp && len < maxlen - 1) {
|
| 176 | c = *(p++);
|
| 177 | if (c == 0 || c == '\n')
|
| 178 | break;
|
| 179 | data[len++] = c;
|
| 180 | }
|
| 181 | data[len] = 0;
|
| 182 | } else {
|
| 183 | len = strlen(data);
|
| 184 | if (len > maxlen)
|
| 185 | len = maxlen;
|
| 186 |
|
| 187 | if (*ppos > len) {
|
| 188 | *lenp = 0;
|
| 189 | return 0;
|
| 190 | }
|
| 191 |
|
| 192 | data += *ppos;
|
| 193 | len -= *ppos;
|
| 194 |
|
| 195 | if (len > *lenp)
|
| 196 | len = *lenp;
|
| 197 | if (len)
|
| 198 | memcpy(buffer, data, len);
|
| 199 | if (len < *lenp) {
|
| 200 | buffer[len] = '\n';
|
| 201 | len++;
|
| 202 | }
|
| 203 | *lenp = len;
|
| 204 | *ppos += len;
|
| 205 | }
|
| 206 | return 0;
|
| 207 | }
|
| 208 |
|
| 209 | static void warn_sysctl_write(struct ctl_table *table)
|
| 210 | {
|
| 211 | pr_warn_once("%s wrote to %s when file position was not 0!\n"
|
| 212 | "This will not be supported in the future. To silence this\n"
|
| 213 | "warning, set kernel.sysctl_writes_strict = -1\n",
|
| 214 | current->comm, table->procname);
|
| 215 | }
|
| 216 |
|
| 217 | |
| 218 | * proc_first_pos_non_zero_ignore - check if first position is allowed
|
| 219 | * @ppos: file position
|
| 220 | * @table: the sysctl table
|
| 221 | *
|
| 222 | * Returns true if the first position is non-zero and the sysctl_writes_strict
|
| 223 | * mode indicates this is not allowed for numeric input types. String proc
|
| 224 | * handlers can ignore the return value.
|
| 225 |
|
| 226 | static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
|
| 227 | struct ctl_table *table)
|
| 228 | {
|
| 229 | if (!*ppos)
|
| 230 | return false;
|
| 231 |
|
| 232 | switch (sysctl_writes_strict) {
|
| 233 | case SYSCTL_WRITES_STRICT:
|
| 234 | return true;
|
| 235 | case SYSCTL_WRITES_WARN:
|
| 236 | warn_sysctl_write(table);
|
| 237 | return false;
|
| 238 | default:
|
| 239 | return false;
|
| 240 | }
|
| 241 | }
|
| 242 |
|
| 243 | |
| 244 | * proc_dostring - read a string sysctl
|
| 245 | * @table: the sysctl table
|
| 246 | * @write: %TRUE if this is a write to the sysctl file
|
| 247 | * @buffer: the user buffer
|
| 248 | * @lenp: the size of the user buffer
|
| 249 | * @ppos: file position
|
| 250 | *
|
| 251 | * Reads/writes a string from/to the user buffer. If the kernel
|
| 252 | * buffer provided is not large enough to hold the string, the
|
| 253 | * string is truncated. The copied string is %NULL-terminated.
|
| 254 | * If the string is being read by the user process, it is copied
|
| 255 | * and a newline '\n' is added. It is truncated if the buffer is
|
| 256 | * not large enough.
|
| 257 | *
|
| 258 | * Returns 0 on success.
|
| 259 |
|
| 260 | int proc_dostring(struct ctl_table *table, int write,
|
| 261 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 262 | {
|
| 263 | if (write)
|
| 264 | proc_first_pos_non_zero_ignore(ppos, table);
|
| 265 |
|
| 266 | return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
|
| 267 | ppos);
|
| 268 | }
|
| 269 |
|
| 270 | static void proc_skip_spaces(char **buf, size_t *size)
|
| 271 | {
|
| 272 | while (*size) {
|
| 273 | if (!isspace(**buf))
|
| 274 | break;
|
| 275 | (*size)--;
|
| 276 | (*buf)++;
|
| 277 | }
|
| 278 | }
|
| 279 |
|
| 280 | static void proc_skip_char(char **buf, size_t *size, const char v)
|
| 281 | {
|
| 282 | while (*size) {
|
| 283 | if (**buf != v)
|
| 284 | break;
|
| 285 | (*size)--;
|
| 286 | (*buf)++;
|
| 287 | }
|
| 288 | }
|
| 289 |
|
| 290 | |
| 291 | * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
|
| 292 | * fail on overflow
|
| 293 | *
|
| 294 | * @cp: kernel buffer containing the string to parse
|
| 295 | * @endp: pointer to store the trailing characters
|
| 296 | * @base: the base to use
|
| 297 | * @res: where the parsed integer will be stored
|
| 298 | *
|
| 299 | * In case of success 0 is returned and @res will contain the parsed integer,
|
| 300 | * @endp will hold any trailing characters.
|
| 301 | * This function will fail the parse on overflow. If there wasn't an overflow
|
| 302 | * the function will defer the decision what characters count as invalid to the
|
| 303 | * caller.
|
| 304 |
|
| 305 | static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
|
| 306 | unsigned long *res)
|
| 307 | {
|
| 308 | unsigned long long result;
|
| 309 | unsigned int rv;
|
| 310 |
|
| 311 | cp = _parse_integer_fixup_radix(cp, &base);
|
| 312 | rv = _parse_integer(cp, base, &result);
|
| 313 | if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
|
| 314 | return -ERANGE;
|
| 315 |
|
| 316 | cp += rv;
|
| 317 |
|
| 318 | if (endp)
|
| 319 | *endp = (char *)cp;
|
| 320 |
|
| 321 | *res = (unsigned long)result;
|
| 322 | return 0;
|
| 323 | }
|
| 324 |
|
| 325 | #define TMPBUFLEN 22
|
| 326 | |
| 327 | * proc_get_long - reads an ASCII formatted integer from a user buffer
|
| 328 | *
|
| 329 | * @buf: a kernel buffer
|
| 330 | * @size: size of the kernel buffer
|
| 331 | * @val: this is where the number will be stored
|
| 332 | * @neg: set to %TRUE if number is negative
|
| 333 | * @perm_tr: a vector which contains the allowed trailers
|
| 334 | * @perm_tr_len: size of the perm_tr vector
|
| 335 | * @tr: pointer to store the trailer character
|
| 336 | *
|
| 337 | * In case of success %0 is returned and @buf and @size are updated with
|
| 338 | * the amount of bytes read. If @tr is non-NULL and a trailing
|
| 339 | * character exists (size is non-zero after returning from this
|
| 340 | * function), @tr is updated with the trailing character.
|
| 341 |
|
| 342 | static int proc_get_long(char **buf, size_t *size,
|
| 343 | unsigned long *val, bool *neg,
|
| 344 | const char *perm_tr, unsigned perm_tr_len, char *tr)
|
| 345 | {
|
| 346 | char *p, tmp[TMPBUFLEN];
|
| 347 | ssize_t len = *size;
|
| 348 |
|
| 349 | if (len <= 0)
|
| 350 | return -EINVAL;
|
| 351 |
|
| 352 | if (len > TMPBUFLEN - 1)
|
| 353 | len = TMPBUFLEN - 1;
|
| 354 |
|
| 355 | memcpy(tmp, *buf, len);
|
| 356 |
|
| 357 | tmp[len] = 0;
|
| 358 | p = tmp;
|
| 359 | if (*p == '-' && *size > 1) {
|
| 360 | *neg = true;
|
| 361 | p++;
|
| 362 | } else
|
| 363 | *neg = false;
|
| 364 | if (!isdigit(*p))
|
| 365 | return -EINVAL;
|
| 366 |
|
| 367 | if (strtoul_lenient(p, &p, 0, val))
|
| 368 | return -EINVAL;
|
| 369 |
|
| 370 | len = p - tmp;
|
| 371 |
|
| 372 | |
| 373 | * invalid integers (e.g. 1234...a) or two integers instead of one
|
| 374 | * (e.g. 123...1). So lets not allow such large numbers.
|
| 375 | if (len == TMPBUFLEN - 1)
|
| 376 | return -EINVAL;
|
| 377 |
|
| 378 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
|
| 379 | return -EINVAL;
|
| 380 |
|
| 381 | if (tr && (len < *size))
|
| 382 | *tr = *p;
|
| 383 |
|
| 384 | *buf += len;
|
| 385 | *size -= len;
|
| 386 |
|
| 387 | return 0;
|
| 388 | }
|
| 389 |
|
| 390 | |
| 391 | * proc_put_long - converts an integer to a decimal ASCII formatted string
|
| 392 | *
|
| 393 | * @buf: the user buffer
|
| 394 | * @size: the size of the user buffer
|
| 395 | * @val: the integer to be converted
|
| 396 | * @neg: sign of the number, %TRUE for negative
|
| 397 | *
|
| 398 | * In case of success @buf and @size are updated with the amount of bytes
|
| 399 | * written.
|
| 400 |
|
| 401 | static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
|
| 402 | {
|
| 403 | int len;
|
| 404 | char tmp[TMPBUFLEN], *p = tmp;
|
| 405 |
|
| 406 | sprintf(p, "%s%lu", neg ? "-" : "", val);
|
| 407 | len = strlen(tmp);
|
| 408 | if (len > *size)
|
| 409 | len = *size;
|
| 410 | memcpy(*buf, tmp, len);
|
| 411 | *size -= len;
|
| 412 | *buf += len;
|
| 413 | }
|
| 414 | #undef TMPBUFLEN
|
| 415 |
|
| 416 | static void proc_put_char(void **buf, size_t *size, char c)
|
| 417 | {
|
| 418 | if (*size) {
|
| 419 | char **buffer = (char **)buf;
|
| 420 | **buffer = c;
|
| 421 |
|
| 422 | (*size)--;
|
| 423 | (*buffer)++;
|
| 424 | *buf = *buffer;
|
| 425 | }
|
| 426 | }
|
| 427 |
|
| 428 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
|
| 429 | int *valp,
|
| 430 | int write, void *data)
|
| 431 | {
|
| 432 | if (write) {
|
| 433 | if (*negp) {
|
| 434 | if (*lvalp > (unsigned long) INT_MAX + 1)
|
| 435 | return -EINVAL;
|
| 436 | WRITE_ONCE(*valp, -*lvalp);
|
| 437 | } else {
|
| 438 | if (*lvalp > (unsigned long) INT_MAX)
|
| 439 | return -EINVAL;
|
| 440 | WRITE_ONCE(*valp, *lvalp);
|
| 441 | }
|
| 442 | } else {
|
| 443 | int val = READ_ONCE(*valp);
|
| 444 | if (val < 0) {
|
| 445 | *negp = true;
|
| 446 | *lvalp = -(unsigned long)val;
|
| 447 | } else {
|
| 448 | *negp = false;
|
| 449 | *lvalp = (unsigned long)val;
|
| 450 | }
|
| 451 | }
|
| 452 | return 0;
|
| 453 | }
|
| 454 |
|
| 455 | static int do_proc_douintvec_conv(unsigned long *lvalp,
|
| 456 | unsigned int *valp,
|
| 457 | int write, void *data)
|
| 458 | {
|
| 459 | if (write) {
|
| 460 | if (*lvalp > UINT_MAX)
|
| 461 | return -EINVAL;
|
| 462 | WRITE_ONCE(*valp, *lvalp);
|
| 463 | } else {
|
| 464 | unsigned int val = READ_ONCE(*valp);
|
| 465 | *lvalp = (unsigned long)val;
|
| 466 | }
|
| 467 | return 0;
|
| 468 | }
|
| 469 |
|
| 470 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
|
| 471 |
|
| 472 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
|
| 473 | int write, void *buffer,
|
| 474 | size_t *lenp, loff_t *ppos,
|
| 475 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
|
| 476 | int write, void *data),
|
| 477 | void *data)
|
| 478 | {
|
| 479 | int *i, vleft, first = 1, err = 0;
|
| 480 | size_t left;
|
| 481 | char *p;
|
| 482 |
|
| 483 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
| 484 | *lenp = 0;
|
| 485 | return 0;
|
| 486 | }
|
| 487 |
|
| 488 | i = (int *) tbl_data;
|
| 489 | vleft = table->maxlen / sizeof(*i);
|
| 490 | left = *lenp;
|
| 491 |
|
| 492 | if (!conv)
|
| 493 | conv = do_proc_dointvec_conv;
|
| 494 |
|
| 495 | if (write) {
|
| 496 | if (proc_first_pos_non_zero_ignore(ppos, table))
|
| 497 | goto out;
|
| 498 |
|
| 499 | if (left > PAGE_SIZE - 1)
|
| 500 | left = PAGE_SIZE - 1;
|
| 501 | p = buffer;
|
| 502 | }
|
| 503 |
|
| 504 | for (; left && vleft--; i++, first=0) {
|
| 505 | unsigned long lval;
|
| 506 | bool neg;
|
| 507 |
|
| 508 | if (write) {
|
| 509 | proc_skip_spaces(&p, &left);
|
| 510 |
|
| 511 | if (!left)
|
| 512 | break;
|
| 513 | err = proc_get_long(&p, &left, &lval, &neg,
|
| 514 | proc_wspace_sep,
|
| 515 | sizeof(proc_wspace_sep), NULL);
|
| 516 | if (err)
|
| 517 | break;
|
| 518 | if (conv(&neg, &lval, i, 1, data)) {
|
| 519 | err = -EINVAL;
|
| 520 | break;
|
| 521 | }
|
| 522 | } else {
|
| 523 | if (conv(&neg, &lval, i, 0, data)) {
|
| 524 | err = -EINVAL;
|
| 525 | break;
|
| 526 | }
|
| 527 | if (!first)
|
| 528 | proc_put_char(&buffer, &left, '\t');
|
| 529 | proc_put_long(&buffer, &left, lval, neg);
|
| 530 | }
|
| 531 | }
|
| 532 |
|
| 533 | if (!write && !first && left && !err)
|
| 534 | proc_put_char(&buffer, &left, '\n');
|
| 535 | if (write && !err && left)
|
| 536 | proc_skip_spaces(&p, &left);
|
| 537 | if (write && first)
|
| 538 | return err ? : -EINVAL;
|
| 539 | *lenp -= left;
|
| 540 | out:
|
| 541 | *ppos += *lenp;
|
| 542 | return err;
|
| 543 | }
|
| 544 |
|
| 545 | static int do_proc_dointvec(struct ctl_table *table, int write,
|
| 546 | void *buffer, size_t *lenp, loff_t *ppos,
|
| 547 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
|
| 548 | int write, void *data),
|
| 549 | void *data)
|
| 550 | {
|
| 551 | return __do_proc_dointvec(table->data, table, write,
|
| 552 | buffer, lenp, ppos, conv, data);
|
| 553 | }
|
| 554 |
|
| 555 | static int do_proc_douintvec_w(unsigned int *tbl_data,
|
| 556 | struct ctl_table *table,
|
| 557 | void *buffer,
|
| 558 | size_t *lenp, loff_t *ppos,
|
| 559 | int (*conv)(unsigned long *lvalp,
|
| 560 | unsigned int *valp,
|
| 561 | int write, void *data),
|
| 562 | void *data)
|
| 563 | {
|
| 564 | unsigned long lval;
|
| 565 | int err = 0;
|
| 566 | size_t left;
|
| 567 | bool neg;
|
| 568 | char *p = buffer;
|
| 569 |
|
| 570 | left = *lenp;
|
| 571 |
|
| 572 | if (proc_first_pos_non_zero_ignore(ppos, table))
|
| 573 | goto bail_early;
|
| 574 |
|
| 575 | if (left > PAGE_SIZE - 1)
|
| 576 | left = PAGE_SIZE - 1;
|
| 577 |
|
| 578 | proc_skip_spaces(&p, &left);
|
| 579 | if (!left) {
|
| 580 | err = -EINVAL;
|
| 581 | goto out_free;
|
| 582 | }
|
| 583 |
|
| 584 | err = proc_get_long(&p, &left, &lval, &neg,
|
| 585 | proc_wspace_sep,
|
| 586 | sizeof(proc_wspace_sep), NULL);
|
| 587 | if (err || neg) {
|
| 588 | err = -EINVAL;
|
| 589 | goto out_free;
|
| 590 | }
|
| 591 |
|
| 592 | if (conv(&lval, tbl_data, 1, data)) {
|
| 593 | err = -EINVAL;
|
| 594 | goto out_free;
|
| 595 | }
|
| 596 |
|
| 597 | if (!err && left)
|
| 598 | proc_skip_spaces(&p, &left);
|
| 599 |
|
| 600 | out_free:
|
| 601 | if (err)
|
| 602 | return -EINVAL;
|
| 603 |
|
| 604 | return 0;
|
| 605 |
|
| 606 |
|
| 607 | bail_early:
|
| 608 | *ppos += *lenp;
|
| 609 | return err;
|
| 610 | }
|
| 611 |
|
| 612 | static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
|
| 613 | size_t *lenp, loff_t *ppos,
|
| 614 | int (*conv)(unsigned long *lvalp,
|
| 615 | unsigned int *valp,
|
| 616 | int write, void *data),
|
| 617 | void *data)
|
| 618 | {
|
| 619 | unsigned long lval;
|
| 620 | int err = 0;
|
| 621 | size_t left;
|
| 622 |
|
| 623 | left = *lenp;
|
| 624 |
|
| 625 | if (conv(&lval, tbl_data, 0, data)) {
|
| 626 | err = -EINVAL;
|
| 627 | goto out;
|
| 628 | }
|
| 629 |
|
| 630 | proc_put_long(&buffer, &left, lval, false);
|
| 631 | if (!left)
|
| 632 | goto out;
|
| 633 |
|
| 634 | proc_put_char(&buffer, &left, '\n');
|
| 635 |
|
| 636 | out:
|
| 637 | *lenp -= left;
|
| 638 | *ppos += *lenp;
|
| 639 |
|
| 640 | return err;
|
| 641 | }
|
| 642 |
|
| 643 | static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
|
| 644 | int write, void *buffer,
|
| 645 | size_t *lenp, loff_t *ppos,
|
| 646 | int (*conv)(unsigned long *lvalp,
|
| 647 | unsigned int *valp,
|
| 648 | int write, void *data),
|
| 649 | void *data)
|
| 650 | {
|
| 651 | unsigned int *i, vleft;
|
| 652 |
|
| 653 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
| 654 | *lenp = 0;
|
| 655 | return 0;
|
| 656 | }
|
| 657 |
|
| 658 | i = (unsigned int *) tbl_data;
|
| 659 | vleft = table->maxlen / sizeof(*i);
|
| 660 |
|
| 661 | |
| 662 | * Arrays are not supported, keep this simple. *Do not* add
|
| 663 | * support for them.
|
| 664 |
|
| 665 | if (vleft != 1) {
|
| 666 | *lenp = 0;
|
| 667 | return -EINVAL;
|
| 668 | }
|
| 669 |
|
| 670 | if (!conv)
|
| 671 | conv = do_proc_douintvec_conv;
|
| 672 |
|
| 673 | if (write)
|
| 674 | return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
|
| 675 | conv, data);
|
| 676 | return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
|
| 677 | }
|
| 678 |
|
| 679 | int do_proc_douintvec(struct ctl_table *table, int write,
|
| 680 | void *buffer, size_t *lenp, loff_t *ppos,
|
| 681 | int (*conv)(unsigned long *lvalp,
|
| 682 | unsigned int *valp,
|
| 683 | int write, void *data),
|
| 684 | void *data)
|
| 685 | {
|
| 686 | return __do_proc_douintvec(table->data, table, write,
|
| 687 | buffer, lenp, ppos, conv, data);
|
| 688 | }
|
| 689 |
|
| 690 | |
| 691 | * proc_dobool - read/write a bool
|
| 692 | * @table: the sysctl table
|
| 693 | * @write: %TRUE if this is a write to the sysctl file
|
| 694 | * @buffer: the user buffer
|
| 695 | * @lenp: the size of the user buffer
|
| 696 | * @ppos: file position
|
| 697 | *
|
| 698 | * Reads/writes one integer value from/to the user buffer,
|
| 699 | * treated as an ASCII string.
|
| 700 | *
|
| 701 | * table->data must point to a bool variable and table->maxlen must
|
| 702 | * be sizeof(bool).
|
| 703 | *
|
| 704 | * Returns 0 on success.
|
| 705 |
|
| 706 | int proc_dobool(struct ctl_table *table, int write, void *buffer,
|
| 707 | size_t *lenp, loff_t *ppos)
|
| 708 | {
|
| 709 | struct ctl_table tmp;
|
| 710 | bool *data = table->data;
|
| 711 | int res, val;
|
| 712 |
|
| 713 |
|
| 714 | if (table->maxlen != sizeof(bool))
|
| 715 | return -EINVAL;
|
| 716 |
|
| 717 | tmp = *table;
|
| 718 | tmp.maxlen = sizeof(val);
|
| 719 | tmp.data = &val;
|
| 720 |
|
| 721 | val = READ_ONCE(*data);
|
| 722 | res = proc_dointvec(&tmp, write, buffer, lenp, ppos);
|
| 723 | if (res)
|
| 724 | return res;
|
| 725 | if (write)
|
| 726 | WRITE_ONCE(*data, val);
|
| 727 | return 0;
|
| 728 | }
|
| 729 |
|
| 730 | |
| 731 | * proc_dointvec - read a vector of integers
|
| 732 | * @table: the sysctl table
|
| 733 | * @write: %TRUE if this is a write to the sysctl file
|
| 734 | * @buffer: the user buffer
|
| 735 | * @lenp: the size of the user buffer
|
| 736 | * @ppos: file position
|
| 737 | *
|
| 738 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 739 | * values from/to the user buffer, treated as an ASCII string.
|
| 740 | *
|
| 741 | * Returns 0 on success.
|
| 742 |
|
| 743 | int proc_dointvec(struct ctl_table *table, int write, void *buffer,
|
| 744 | size_t *lenp, loff_t *ppos)
|
| 745 | {
|
| 746 | return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
|
| 747 | }
|
| 748 |
|
| 749 | #ifdef CONFIG_COMPACTION
|
| 750 | static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
|
| 751 | int write, void *buffer, size_t *lenp, loff_t *ppos)
|
| 752 | {
|
| 753 | int ret, old;
|
| 754 |
|
| 755 | if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
|
| 756 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
|
| 757 |
|
| 758 | old = *(int *)table->data;
|
| 759 | ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
|
| 760 | if (ret)
|
| 761 | return ret;
|
| 762 | if (old != *(int *)table->data)
|
| 763 | pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
|
| 764 | table->procname, current->comm,
|
| 765 | task_pid_nr(current));
|
| 766 | return ret;
|
| 767 | }
|
| 768 | #endif
|
| 769 |
|
| 770 | |
| 771 | * proc_douintvec - read a vector of unsigned integers
|
| 772 | * @table: the sysctl table
|
| 773 | * @write: %TRUE if this is a write to the sysctl file
|
| 774 | * @buffer: the user buffer
|
| 775 | * @lenp: the size of the user buffer
|
| 776 | * @ppos: file position
|
| 777 | *
|
| 778 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
|
| 779 | * values from/to the user buffer, treated as an ASCII string.
|
| 780 | *
|
| 781 | * Returns 0 on success.
|
| 782 |
|
| 783 | int proc_douintvec(struct ctl_table *table, int write, void *buffer,
|
| 784 | size_t *lenp, loff_t *ppos)
|
| 785 | {
|
| 786 | return do_proc_douintvec(table, write, buffer, lenp, ppos,
|
| 787 | do_proc_douintvec_conv, NULL);
|
| 788 | }
|
| 789 |
|
| 790 | |
| 791 | * Taint values can only be increased
|
| 792 | * This means we can safely use a temporary.
|
| 793 |
|
| 794 | static int proc_taint(struct ctl_table *table, int write,
|
| 795 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 796 | {
|
| 797 | struct ctl_table t;
|
| 798 | unsigned long tmptaint = get_taint();
|
| 799 | int err;
|
| 800 |
|
| 801 | if (write && !capable(CAP_SYS_ADMIN))
|
| 802 | return -EPERM;
|
| 803 |
|
| 804 | t = *table;
|
| 805 | t.data = &tmptaint;
|
| 806 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
|
| 807 | if (err < 0)
|
| 808 | return err;
|
| 809 |
|
| 810 | if (write) {
|
| 811 | int i;
|
| 812 |
|
| 813 | |
| 814 | * If we are relying on panic_on_taint not producing
|
| 815 | * false positives due to userspace input, bail out
|
| 816 | * before setting the requested taint flags.
|
| 817 |
|
| 818 | if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
|
| 819 | return -EINVAL;
|
| 820 |
|
| 821 | |
| 822 | * Poor man's atomic or. Not worth adding a primitive
|
| 823 | * to everyone's atomic.h for this
|
| 824 |
|
| 825 | for (i = 0; i < TAINT_FLAGS_COUNT; i++)
|
| 826 | if ((1UL << i) & tmptaint)
|
| 827 | add_taint(i, LOCKDEP_STILL_OK);
|
| 828 | }
|
| 829 |
|
| 830 | return err;
|
| 831 | }
|
| 832 |
|
| 833 | |
| 834 | * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
|
| 835 | * @min: pointer to minimum allowable value
|
| 836 | * @max: pointer to maximum allowable value
|
| 837 | *
|
| 838 | * The do_proc_dointvec_minmax_conv_param structure provides the
|
| 839 | * minimum and maximum values for doing range checking for those sysctl
|
| 840 | * parameters that use the proc_dointvec_minmax() handler.
|
| 841 |
|
| 842 | struct do_proc_dointvec_minmax_conv_param {
|
| 843 | int *min;
|
| 844 | int *max;
|
| 845 | };
|
| 846 |
|
| 847 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
|
| 848 | int *valp,
|
| 849 | int write, void *data)
|
| 850 | {
|
| 851 | int tmp, ret;
|
| 852 | struct do_proc_dointvec_minmax_conv_param *param = data;
|
| 853 | |
| 854 | * If writing, first do so via a temporary local int so we can
|
| 855 | * bounds-check it before touching *valp.
|
| 856 |
|
| 857 | int *ip = write ? &tmp : valp;
|
| 858 |
|
| 859 | ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
|
| 860 | if (ret)
|
| 861 | return ret;
|
| 862 |
|
| 863 | if (write) {
|
| 864 | if ((param->min && *param->min > tmp) ||
|
| 865 | (param->max && *param->max < tmp))
|
| 866 | return -EINVAL;
|
| 867 | WRITE_ONCE(*valp, tmp);
|
| 868 | }
|
| 869 |
|
| 870 | return 0;
|
| 871 | }
|
| 872 |
|
| 873 | |
| 874 | * proc_dointvec_minmax - read a vector of integers with min/max values
|
| 875 | * @table: the sysctl table
|
| 876 | * @write: %TRUE if this is a write to the sysctl file
|
| 877 | * @buffer: the user buffer
|
| 878 | * @lenp: the size of the user buffer
|
| 879 | * @ppos: file position
|
| 880 | *
|
| 881 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 882 | * values from/to the user buffer, treated as an ASCII string.
|
| 883 | *
|
| 884 | * This routine will ensure the values are within the range specified by
|
| 885 | * table->extra1 (min) and table->extra2 (max).
|
| 886 | *
|
| 887 | * Returns 0 on success or -EINVAL on write when the range check fails.
|
| 888 |
|
| 889 | int proc_dointvec_minmax(struct ctl_table *table, int write,
|
| 890 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 891 | {
|
| 892 | struct do_proc_dointvec_minmax_conv_param param = {
|
| 893 | .min = (int *) table->extra1,
|
| 894 | .max = (int *) table->extra2,
|
| 895 | };
|
| 896 | return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
| 897 | do_proc_dointvec_minmax_conv, ¶m);
|
| 898 | }
|
| 899 |
|
| 900 | |
| 901 | * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
|
| 902 | * @min: pointer to minimum allowable value
|
| 903 | * @max: pointer to maximum allowable value
|
| 904 | *
|
| 905 | * The do_proc_douintvec_minmax_conv_param structure provides the
|
| 906 | * minimum and maximum values for doing range checking for those sysctl
|
| 907 | * parameters that use the proc_douintvec_minmax() handler.
|
| 908 |
|
| 909 | struct do_proc_douintvec_minmax_conv_param {
|
| 910 | unsigned int *min;
|
| 911 | unsigned int *max;
|
| 912 | };
|
| 913 |
|
| 914 | static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
|
| 915 | unsigned int *valp,
|
| 916 | int write, void *data)
|
| 917 | {
|
| 918 | int ret;
|
| 919 | unsigned int tmp;
|
| 920 | struct do_proc_douintvec_minmax_conv_param *param = data;
|
| 921 |
|
| 922 | unsigned int *up = write ? &tmp : valp;
|
| 923 |
|
| 924 | ret = do_proc_douintvec_conv(lvalp, up, write, data);
|
| 925 | if (ret)
|
| 926 | return ret;
|
| 927 |
|
| 928 | if (write) {
|
| 929 | if ((param->min && *param->min > tmp) ||
|
| 930 | (param->max && *param->max < tmp))
|
| 931 | return -ERANGE;
|
| 932 |
|
| 933 | WRITE_ONCE(*valp, tmp);
|
| 934 | }
|
| 935 |
|
| 936 | return 0;
|
| 937 | }
|
| 938 |
|
| 939 | |
| 940 | * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
|
| 941 | * @table: the sysctl table
|
| 942 | * @write: %TRUE if this is a write to the sysctl file
|
| 943 | * @buffer: the user buffer
|
| 944 | * @lenp: the size of the user buffer
|
| 945 | * @ppos: file position
|
| 946 | *
|
| 947 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
|
| 948 | * values from/to the user buffer, treated as an ASCII string. Negative
|
| 949 | * strings are not allowed.
|
| 950 | *
|
| 951 | * This routine will ensure the values are within the range specified by
|
| 952 | * table->extra1 (min) and table->extra2 (max). There is a final sanity
|
| 953 | * check for UINT_MAX to avoid having to support wrap around uses from
|
| 954 | * userspace.
|
| 955 | *
|
| 956 | * Returns 0 on success or -ERANGE on write when the range check fails.
|
| 957 |
|
| 958 | int proc_douintvec_minmax(struct ctl_table *table, int write,
|
| 959 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 960 | {
|
| 961 | struct do_proc_douintvec_minmax_conv_param param = {
|
| 962 | .min = (unsigned int *) table->extra1,
|
| 963 | .max = (unsigned int *) table->extra2,
|
| 964 | };
|
| 965 | return do_proc_douintvec(table, write, buffer, lenp, ppos,
|
| 966 | do_proc_douintvec_minmax_conv, ¶m);
|
| 967 | }
|
| 968 |
|
| 969 | |
| 970 | * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
|
| 971 | * @table: the sysctl table
|
| 972 | * @write: %TRUE if this is a write to the sysctl file
|
| 973 | * @buffer: the user buffer
|
| 974 | * @lenp: the size of the user buffer
|
| 975 | * @ppos: file position
|
| 976 | *
|
| 977 | * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
|
| 978 | * values from/to the user buffer, treated as an ASCII string. Negative
|
| 979 | * strings are not allowed.
|
| 980 | *
|
| 981 | * This routine will ensure the values are within the range specified by
|
| 982 | * table->extra1 (min) and table->extra2 (max).
|
| 983 | *
|
| 984 | * Returns 0 on success or an error on write when the range check fails.
|
| 985 |
|
| 986 | int proc_dou8vec_minmax(struct ctl_table *table, int write,
|
| 987 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 988 | {
|
| 989 | struct ctl_table tmp;
|
| 990 | unsigned int min = 0, max = 255U, val;
|
| 991 | u8 *data = table->data;
|
| 992 | struct do_proc_douintvec_minmax_conv_param param = {
|
| 993 | .min = &min,
|
| 994 | .max = &max,
|
| 995 | };
|
| 996 | int res;
|
| 997 |
|
| 998 |
|
| 999 | if (table->maxlen != sizeof(u8))
|
| 1000 | return -EINVAL;
|
| 1001 |
|
| 1002 | if (table->extra1) {
|
| 1003 | min = *(unsigned int *) table->extra1;
|
| 1004 | if (min > 255U)
|
| 1005 | return -EINVAL;
|
| 1006 | }
|
| 1007 | if (table->extra2) {
|
| 1008 | max = *(unsigned int *) table->extra2;
|
| 1009 | if (max > 255U)
|
| 1010 | return -EINVAL;
|
| 1011 | }
|
| 1012 |
|
| 1013 | tmp = *table;
|
| 1014 |
|
| 1015 | tmp.maxlen = sizeof(val);
|
| 1016 | tmp.data = &val;
|
| 1017 | val = READ_ONCE(*data);
|
| 1018 | res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
|
| 1019 | do_proc_douintvec_minmax_conv, ¶m);
|
| 1020 | if (res)
|
| 1021 | return res;
|
| 1022 | if (write)
|
| 1023 | WRITE_ONCE(*data, val);
|
| 1024 | return 0;
|
| 1025 | }
|
| 1026 | EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
|
| 1027 |
|
| 1028 | #ifdef CONFIG_MAGIC_SYSRQ
|
| 1029 | static int sysrq_sysctl_handler(struct ctl_table *table, int write,
|
| 1030 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1031 | {
|
| 1032 | int tmp, ret;
|
| 1033 |
|
| 1034 | tmp = sysrq_mask();
|
| 1035 |
|
| 1036 | ret = __do_proc_dointvec(&tmp, table, write, buffer,
|
| 1037 | lenp, ppos, NULL, NULL);
|
| 1038 | if (ret || !write)
|
| 1039 | return ret;
|
| 1040 |
|
| 1041 | if (write)
|
| 1042 | sysrq_toggle_support(tmp);
|
| 1043 |
|
| 1044 | return 0;
|
| 1045 | }
|
| 1046 | #endif
|
| 1047 |
|
| 1048 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
|
| 1049 | int write, void *buffer, size_t *lenp, loff_t *ppos,
|
| 1050 | unsigned long convmul, unsigned long convdiv)
|
| 1051 | {
|
| 1052 | unsigned long *i, *min, *max;
|
| 1053 | int vleft, first = 1, err = 0;
|
| 1054 | size_t left;
|
| 1055 | char *p;
|
| 1056 |
|
| 1057 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
| 1058 | *lenp = 0;
|
| 1059 | return 0;
|
| 1060 | }
|
| 1061 |
|
| 1062 | i = data;
|
| 1063 | min = table->extra1;
|
| 1064 | max = table->extra2;
|
| 1065 | vleft = table->maxlen / sizeof(unsigned long);
|
| 1066 | left = *lenp;
|
| 1067 |
|
| 1068 | if (write) {
|
| 1069 | if (proc_first_pos_non_zero_ignore(ppos, table))
|
| 1070 | goto out;
|
| 1071 |
|
| 1072 | if (left > PAGE_SIZE - 1)
|
| 1073 | left = PAGE_SIZE - 1;
|
| 1074 | p = buffer;
|
| 1075 | }
|
| 1076 |
|
| 1077 | for (; left && vleft--; i++, first = 0) {
|
| 1078 | unsigned long val;
|
| 1079 |
|
| 1080 | if (write) {
|
| 1081 | bool neg;
|
| 1082 |
|
| 1083 | proc_skip_spaces(&p, &left);
|
| 1084 | if (!left)
|
| 1085 | break;
|
| 1086 |
|
| 1087 | err = proc_get_long(&p, &left, &val, &neg,
|
| 1088 | proc_wspace_sep,
|
| 1089 | sizeof(proc_wspace_sep), NULL);
|
| 1090 | if (err || neg) {
|
| 1091 | err = -EINVAL;
|
| 1092 | break;
|
| 1093 | }
|
| 1094 |
|
| 1095 | val = convmul * val / convdiv;
|
| 1096 | if ((min && val < *min) || (max && val > *max)) {
|
| 1097 | err = -EINVAL;
|
| 1098 | break;
|
| 1099 | }
|
| 1100 | WRITE_ONCE(*i, val);
|
| 1101 | } else {
|
| 1102 | val = convdiv * READ_ONCE(*i) / convmul;
|
| 1103 | if (!first)
|
| 1104 | proc_put_char(&buffer, &left, '\t');
|
| 1105 | proc_put_long(&buffer, &left, val, false);
|
| 1106 | }
|
| 1107 | }
|
| 1108 |
|
| 1109 | if (!write && !first && left && !err)
|
| 1110 | proc_put_char(&buffer, &left, '\n');
|
| 1111 | if (write && !err)
|
| 1112 | proc_skip_spaces(&p, &left);
|
| 1113 | if (write && first)
|
| 1114 | return err ? : -EINVAL;
|
| 1115 | *lenp -= left;
|
| 1116 | out:
|
| 1117 | *ppos += *lenp;
|
| 1118 | return err;
|
| 1119 | }
|
| 1120 |
|
| 1121 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
|
| 1122 | void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
|
| 1123 | unsigned long convdiv)
|
| 1124 | {
|
| 1125 | return __do_proc_doulongvec_minmax(table->data, table, write,
|
| 1126 | buffer, lenp, ppos, convmul, convdiv);
|
| 1127 | }
|
| 1128 |
|
| 1129 | |
| 1130 | * proc_doulongvec_minmax - read a vector of long integers with min/max values
|
| 1131 | * @table: the sysctl table
|
| 1132 | * @write: %TRUE if this is a write to the sysctl file
|
| 1133 | * @buffer: the user buffer
|
| 1134 | * @lenp: the size of the user buffer
|
| 1135 | * @ppos: file position
|
| 1136 | *
|
| 1137 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
|
| 1138 | * values from/to the user buffer, treated as an ASCII string.
|
| 1139 | *
|
| 1140 | * This routine will ensure the values are within the range specified by
|
| 1141 | * table->extra1 (min) and table->extra2 (max).
|
| 1142 | *
|
| 1143 | * Returns 0 on success.
|
| 1144 |
|
| 1145 | int proc_doulongvec_minmax(struct ctl_table *table, int write,
|
| 1146 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1147 | {
|
| 1148 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
|
| 1149 | }
|
| 1150 |
|
| 1151 | |
| 1152 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
|
| 1153 | * @table: the sysctl table
|
| 1154 | * @write: %TRUE if this is a write to the sysctl file
|
| 1155 | * @buffer: the user buffer
|
| 1156 | * @lenp: the size of the user buffer
|
| 1157 | * @ppos: file position
|
| 1158 | *
|
| 1159 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
|
| 1160 | * values from/to the user buffer, treated as an ASCII string. The values
|
| 1161 | * are treated as milliseconds, and converted to jiffies when they are stored.
|
| 1162 | *
|
| 1163 | * This routine will ensure the values are within the range specified by
|
| 1164 | * table->extra1 (min) and table->extra2 (max).
|
| 1165 | *
|
| 1166 | * Returns 0 on success.
|
| 1167 |
|
| 1168 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
|
| 1169 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1170 | {
|
| 1171 | return do_proc_doulongvec_minmax(table, write, buffer,
|
| 1172 | lenp, ppos, HZ, 1000l);
|
| 1173 | }
|
| 1174 |
|
| 1175 |
|
| 1176 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
|
| 1177 | int *valp,
|
| 1178 | int write, void *data)
|
| 1179 | {
|
| 1180 | if (write) {
|
| 1181 | if (*lvalp > INT_MAX / HZ)
|
| 1182 | return 1;
|
| 1183 | if (*negp)
|
| 1184 | WRITE_ONCE(*valp, -*lvalp * HZ);
|
| 1185 | else
|
| 1186 | WRITE_ONCE(*valp, *lvalp * HZ);
|
| 1187 | } else {
|
| 1188 | int val = READ_ONCE(*valp);
|
| 1189 | unsigned long lval;
|
| 1190 | if (val < 0) {
|
| 1191 | *negp = true;
|
| 1192 | lval = -(unsigned long)val;
|
| 1193 | } else {
|
| 1194 | *negp = false;
|
| 1195 | lval = (unsigned long)val;
|
| 1196 | }
|
| 1197 | *lvalp = lval / HZ;
|
| 1198 | }
|
| 1199 | return 0;
|
| 1200 | }
|
| 1201 |
|
| 1202 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
|
| 1203 | int *valp,
|
| 1204 | int write, void *data)
|
| 1205 | {
|
| 1206 | if (write) {
|
| 1207 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
|
| 1208 | return 1;
|
| 1209 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
|
| 1210 | } else {
|
| 1211 | int val = *valp;
|
| 1212 | unsigned long lval;
|
| 1213 | if (val < 0) {
|
| 1214 | *negp = true;
|
| 1215 | lval = -(unsigned long)val;
|
| 1216 | } else {
|
| 1217 | *negp = false;
|
| 1218 | lval = (unsigned long)val;
|
| 1219 | }
|
| 1220 | *lvalp = jiffies_to_clock_t(lval);
|
| 1221 | }
|
| 1222 | return 0;
|
| 1223 | }
|
| 1224 |
|
| 1225 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
|
| 1226 | int *valp,
|
| 1227 | int write, void *data)
|
| 1228 | {
|
| 1229 | if (write) {
|
| 1230 | unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
|
| 1231 |
|
| 1232 | if (jif > INT_MAX)
|
| 1233 | return 1;
|
| 1234 | WRITE_ONCE(*valp, (int)jif);
|
| 1235 | } else {
|
| 1236 | int val = READ_ONCE(*valp);
|
| 1237 | unsigned long lval;
|
| 1238 | if (val < 0) {
|
| 1239 | *negp = true;
|
| 1240 | lval = -(unsigned long)val;
|
| 1241 | } else {
|
| 1242 | *negp = false;
|
| 1243 | lval = (unsigned long)val;
|
| 1244 | }
|
| 1245 | *lvalp = jiffies_to_msecs(lval);
|
| 1246 | }
|
| 1247 | return 0;
|
| 1248 | }
|
| 1249 |
|
| 1250 | static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp,
|
| 1251 | int *valp, int write, void *data)
|
| 1252 | {
|
| 1253 | int tmp, ret;
|
| 1254 | struct do_proc_dointvec_minmax_conv_param *param = data;
|
| 1255 | |
| 1256 | * If writing, first do so via a temporary local int so we can
|
| 1257 | * bounds-check it before touching *valp.
|
| 1258 |
|
| 1259 | int *ip = write ? &tmp : valp;
|
| 1260 |
|
| 1261 | ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data);
|
| 1262 | if (ret)
|
| 1263 | return ret;
|
| 1264 |
|
| 1265 | if (write) {
|
| 1266 | if ((param->min && *param->min > tmp) ||
|
| 1267 | (param->max && *param->max < tmp))
|
| 1268 | return -EINVAL;
|
| 1269 | *valp = tmp;
|
| 1270 | }
|
| 1271 | return 0;
|
| 1272 | }
|
| 1273 |
|
| 1274 | |
| 1275 | * proc_dointvec_jiffies - read a vector of integers as seconds
|
| 1276 | * @table: the sysctl table
|
| 1277 | * @write: %TRUE if this is a write to the sysctl file
|
| 1278 | * @buffer: the user buffer
|
| 1279 | * @lenp: the size of the user buffer
|
| 1280 | * @ppos: file position
|
| 1281 | *
|
| 1282 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 1283 | * values from/to the user buffer, treated as an ASCII string.
|
| 1284 | * The values read are assumed to be in seconds, and are converted into
|
| 1285 | * jiffies.
|
| 1286 | *
|
| 1287 | * Returns 0 on success.
|
| 1288 |
|
| 1289 | int proc_dointvec_jiffies(struct ctl_table *table, int write,
|
| 1290 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1291 | {
|
| 1292 | return do_proc_dointvec(table,write,buffer,lenp,ppos,
|
| 1293 | do_proc_dointvec_jiffies_conv,NULL);
|
| 1294 | }
|
| 1295 |
|
| 1296 | int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
|
| 1297 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1298 | {
|
| 1299 | struct do_proc_dointvec_minmax_conv_param param = {
|
| 1300 | .min = (int *) table->extra1,
|
| 1301 | .max = (int *) table->extra2,
|
| 1302 | };
|
| 1303 | return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
| 1304 | do_proc_dointvec_ms_jiffies_minmax_conv, ¶m);
|
| 1305 | }
|
| 1306 |
|
| 1307 | |
| 1308 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
|
| 1309 | * @table: the sysctl table
|
| 1310 | * @write: %TRUE if this is a write to the sysctl file
|
| 1311 | * @buffer: the user buffer
|
| 1312 | * @lenp: the size of the user buffer
|
| 1313 | * @ppos: pointer to the file position
|
| 1314 | *
|
| 1315 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 1316 | * values from/to the user buffer, treated as an ASCII string.
|
| 1317 | * The values read are assumed to be in 1/USER_HZ seconds, and
|
| 1318 | * are converted into jiffies.
|
| 1319 | *
|
| 1320 | * Returns 0 on success.
|
| 1321 |
|
| 1322 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
|
| 1323 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1324 | {
|
| 1325 | return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
| 1326 | do_proc_dointvec_userhz_jiffies_conv, NULL);
|
| 1327 | }
|
| 1328 |
|
| 1329 | |
| 1330 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
|
| 1331 | * @table: the sysctl table
|
| 1332 | * @write: %TRUE if this is a write to the sysctl file
|
| 1333 | * @buffer: the user buffer
|
| 1334 | * @lenp: the size of the user buffer
|
| 1335 | * @ppos: file position
|
| 1336 | * @ppos: the current position in the file
|
| 1337 | *
|
| 1338 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 1339 | * values from/to the user buffer, treated as an ASCII string.
|
| 1340 | * The values read are assumed to be in 1/1000 seconds, and
|
| 1341 | * are converted into jiffies.
|
| 1342 | *
|
| 1343 | * Returns 0 on success.
|
| 1344 |
|
| 1345 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
|
| 1346 | size_t *lenp, loff_t *ppos)
|
| 1347 | {
|
| 1348 | return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
| 1349 | do_proc_dointvec_ms_jiffies_conv, NULL);
|
| 1350 | }
|
| 1351 |
|
| 1352 | static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
|
| 1353 | size_t *lenp, loff_t *ppos)
|
| 1354 | {
|
| 1355 | struct pid *new_pid;
|
| 1356 | pid_t tmp;
|
| 1357 | int r;
|
| 1358 |
|
| 1359 | tmp = pid_vnr(cad_pid);
|
| 1360 |
|
| 1361 | r = __do_proc_dointvec(&tmp, table, write, buffer,
|
| 1362 | lenp, ppos, NULL, NULL);
|
| 1363 | if (r || !write)
|
| 1364 | return r;
|
| 1365 |
|
| 1366 | new_pid = find_get_pid(tmp);
|
| 1367 | if (!new_pid)
|
| 1368 | return -ESRCH;
|
| 1369 |
|
| 1370 | put_pid(xchg(&cad_pid, new_pid));
|
| 1371 | return 0;
|
| 1372 | }
|
| 1373 |
|
| 1374 | |
| 1375 | * proc_do_large_bitmap - read/write from/to a large bitmap
|
| 1376 | * @table: the sysctl table
|
| 1377 | * @write: %TRUE if this is a write to the sysctl file
|
| 1378 | * @buffer: the user buffer
|
| 1379 | * @lenp: the size of the user buffer
|
| 1380 | * @ppos: file position
|
| 1381 | *
|
| 1382 | * The bitmap is stored at table->data and the bitmap length (in bits)
|
| 1383 | * in table->maxlen.
|
| 1384 | *
|
| 1385 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that
|
| 1386 | * large bitmaps may be represented in a compact manner. Writing into
|
| 1387 | * the file will clear the bitmap then update it with the given input.
|
| 1388 | *
|
| 1389 | * Returns 0 on success.
|
| 1390 |
|
| 1391 | int proc_do_large_bitmap(struct ctl_table *table, int write,
|
| 1392 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1393 | {
|
| 1394 | int err = 0;
|
| 1395 | size_t left = *lenp;
|
| 1396 | unsigned long bitmap_len = table->maxlen;
|
| 1397 | unsigned long *bitmap = *(unsigned long **) table->data;
|
| 1398 | unsigned long *tmp_bitmap = NULL;
|
| 1399 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
|
| 1400 |
|
| 1401 | if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
|
| 1402 | *lenp = 0;
|
| 1403 | return 0;
|
| 1404 | }
|
| 1405 |
|
| 1406 | if (write) {
|
| 1407 | char *p = buffer;
|
| 1408 | size_t skipped = 0;
|
| 1409 |
|
| 1410 | if (left > PAGE_SIZE - 1) {
|
| 1411 | left = PAGE_SIZE - 1;
|
| 1412 |
|
| 1413 | skipped = *lenp - left;
|
| 1414 | }
|
| 1415 |
|
| 1416 | tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
|
| 1417 | if (!tmp_bitmap)
|
| 1418 | return -ENOMEM;
|
| 1419 | proc_skip_char(&p, &left, '\n');
|
| 1420 | while (!err && left) {
|
| 1421 | unsigned long val_a, val_b;
|
| 1422 | bool neg;
|
| 1423 | size_t saved_left;
|
| 1424 |
|
| 1425 |
|
| 1426 | saved_left = left;
|
| 1427 | err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
|
| 1428 | sizeof(tr_a), &c);
|
| 1429 | |
| 1430 | * If we consumed the entirety of a truncated buffer or
|
| 1431 | * only one char is left (may be a "-"), then stop here,
|
| 1432 | * reset, & come back for more.
|
| 1433 |
|
| 1434 | if ((left <= 1) && skipped) {
|
| 1435 | left = saved_left;
|
| 1436 | break;
|
| 1437 | }
|
| 1438 |
|
| 1439 | if (err)
|
| 1440 | break;
|
| 1441 | if (val_a >= bitmap_len || neg) {
|
| 1442 | err = -EINVAL;
|
| 1443 | break;
|
| 1444 | }
|
| 1445 |
|
| 1446 | val_b = val_a;
|
| 1447 | if (left) {
|
| 1448 | p++;
|
| 1449 | left--;
|
| 1450 | }
|
| 1451 |
|
| 1452 | if (c == '-') {
|
| 1453 | err = proc_get_long(&p, &left, &val_b,
|
| 1454 | &neg, tr_b, sizeof(tr_b),
|
| 1455 | &c);
|
| 1456 | |
| 1457 | * If we consumed all of a truncated buffer or
|
| 1458 | * then stop here, reset, & come back for more.
|
| 1459 |
|
| 1460 | if (!left && skipped) {
|
| 1461 | left = saved_left;
|
| 1462 | break;
|
| 1463 | }
|
| 1464 |
|
| 1465 | if (err)
|
| 1466 | break;
|
| 1467 | if (val_b >= bitmap_len || neg ||
|
| 1468 | val_a > val_b) {
|
| 1469 | err = -EINVAL;
|
| 1470 | break;
|
| 1471 | }
|
| 1472 | if (left) {
|
| 1473 | p++;
|
| 1474 | left--;
|
| 1475 | }
|
| 1476 | }
|
| 1477 |
|
| 1478 | bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
|
| 1479 | proc_skip_char(&p, &left, '\n');
|
| 1480 | }
|
| 1481 | left += skipped;
|
| 1482 | } else {
|
| 1483 | unsigned long bit_a, bit_b = 0;
|
| 1484 | bool first = 1;
|
| 1485 |
|
| 1486 | while (left) {
|
| 1487 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
|
| 1488 | if (bit_a >= bitmap_len)
|
| 1489 | break;
|
| 1490 | bit_b = find_next_zero_bit(bitmap, bitmap_len,
|
| 1491 | bit_a + 1) - 1;
|
| 1492 |
|
| 1493 | if (!first)
|
| 1494 | proc_put_char(&buffer, &left, ',');
|
| 1495 | proc_put_long(&buffer, &left, bit_a, false);
|
| 1496 | if (bit_a != bit_b) {
|
| 1497 | proc_put_char(&buffer, &left, '-');
|
| 1498 | proc_put_long(&buffer, &left, bit_b, false);
|
| 1499 | }
|
| 1500 |
|
| 1501 | first = 0; bit_b++;
|
| 1502 | }
|
| 1503 | proc_put_char(&buffer, &left, '\n');
|
| 1504 | }
|
| 1505 |
|
| 1506 | if (!err) {
|
| 1507 | if (write) {
|
| 1508 | if (*ppos)
|
| 1509 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
|
| 1510 | else
|
| 1511 | bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
|
| 1512 | }
|
| 1513 | *lenp -= left;
|
| 1514 | *ppos += *lenp;
|
| 1515 | }
|
| 1516 |
|
| 1517 | bitmap_free(tmp_bitmap);
|
| 1518 | return err;
|
| 1519 | }
|
| 1520 |
|
| 1521 | #else
|
| 1522 |
|
| 1523 | int proc_dostring(struct ctl_table *table, int write,
|
| 1524 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1525 | {
|
| 1526 | return -ENOSYS;
|
| 1527 | }
|
| 1528 |
|
| 1529 | int proc_dobool(struct ctl_table *table, int write,
|
| 1530 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1531 | {
|
| 1532 | return -ENOSYS;
|
| 1533 | }
|
| 1534 |
|
| 1535 | int proc_dointvec(struct ctl_table *table, int write,
|
| 1536 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1537 | {
|
| 1538 | return -ENOSYS;
|
| 1539 | }
|
| 1540 |
|
| 1541 | int proc_douintvec(struct ctl_table *table, int write,
|
| 1542 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1543 | {
|
| 1544 | return -ENOSYS;
|
| 1545 | }
|
| 1546 |
|
| 1547 | int proc_dointvec_minmax(struct ctl_table *table, int write,
|
| 1548 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1549 | {
|
| 1550 | return -ENOSYS;
|
| 1551 | }
|
| 1552 |
|
| 1553 | int proc_douintvec_minmax(struct ctl_table *table, int write,
|
| 1554 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1555 | {
|
| 1556 | return -ENOSYS;
|
| 1557 | }
|
| 1558 |
|
| 1559 | int proc_dou8vec_minmax(struct ctl_table *table, int write,
|
| 1560 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1561 | {
|
| 1562 | return -ENOSYS;
|
| 1563 | }
|
| 1564 |
|
| 1565 | int proc_dointvec_jiffies(struct ctl_table *table, int write,
|
| 1566 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1567 | {
|
| 1568 | return -ENOSYS;
|
| 1569 | }
|
| 1570 |
|
| 1571 | int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
|
| 1572 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1573 | {
|
| 1574 | return -ENOSYS;
|
| 1575 | }
|
| 1576 |
|
| 1577 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
|
| 1578 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1579 | {
|
| 1580 | return -ENOSYS;
|
| 1581 | }
|
| 1582 |
|
| 1583 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
|
| 1584 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1585 | {
|
| 1586 | return -ENOSYS;
|
| 1587 | }
|
| 1588 |
|
| 1589 | int proc_doulongvec_minmax(struct ctl_table *table, int write,
|
| 1590 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1591 | {
|
| 1592 | return -ENOSYS;
|
| 1593 | }
|
| 1594 |
|
| 1595 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
|
| 1596 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1597 | {
|
| 1598 | return -ENOSYS;
|
| 1599 | }
|
| 1600 |
|
| 1601 | int proc_do_large_bitmap(struct ctl_table *table, int write,
|
| 1602 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1603 | {
|
| 1604 | return -ENOSYS;
|
| 1605 | }
|
| 1606 |
|
| 1607 | #endif
|
| 1608 |
|
| 1609 | #if defined(CONFIG_SYSCTL)
|
| 1610 | int proc_do_static_key(struct ctl_table *table, int write,
|
| 1611 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1612 | {
|
| 1613 | struct static_key *key = (struct static_key *)table->data;
|
| 1614 | static DEFINE_MUTEX(static_key_mutex);
|
| 1615 | int val, ret;
|
| 1616 | struct ctl_table tmp = {
|
| 1617 | .data = &val,
|
| 1618 | .maxlen = sizeof(val),
|
| 1619 | .mode = table->mode,
|
| 1620 | .extra1 = SYSCTL_ZERO,
|
| 1621 | .extra2 = SYSCTL_ONE,
|
| 1622 | };
|
| 1623 |
|
| 1624 | if (write && !capable(CAP_SYS_ADMIN))
|
| 1625 | return -EPERM;
|
| 1626 |
|
| 1627 | mutex_lock(&static_key_mutex);
|
| 1628 | val = static_key_enabled(key);
|
| 1629 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
|
| 1630 | if (write && !ret) {
|
| 1631 | if (val)
|
| 1632 | static_key_enable(key);
|
| 1633 | else
|
| 1634 | static_key_disable(key);
|
| 1635 | }
|
| 1636 | mutex_unlock(&static_key_mutex);
|
| 1637 | return ret;
|
| 1638 | }
|
| 1639 |
|
| 1640 | static struct ctl_table kern_table[] = {
|
| 1641 | {
|
| 1642 | .procname = "panic",
|
| 1643 | .data = &panic_timeout,
|
| 1644 | .maxlen = sizeof(int),
|
| 1645 | .mode = 0644,
|
| 1646 | .proc_handler = proc_dointvec,
|
| 1647 | },
|
| 1648 | #ifdef CONFIG_PROC_SYSCTL
|
| 1649 | {
|
| 1650 | .procname = "tainted",
|
| 1651 | .maxlen = sizeof(long),
|
| 1652 | .mode = 0644,
|
| 1653 | .proc_handler = proc_taint,
|
| 1654 | },
|
| 1655 | {
|
| 1656 | .procname = "sysctl_writes_strict",
|
| 1657 | .data = &sysctl_writes_strict,
|
| 1658 | .maxlen = sizeof(int),
|
| 1659 | .mode = 0644,
|
| 1660 | .proc_handler = proc_dointvec_minmax,
|
| 1661 | .extra1 = SYSCTL_NEG_ONE,
|
| 1662 | .extra2 = SYSCTL_ONE,
|
| 1663 | },
|
| 1664 | #endif
|
| 1665 | {
|
| 1666 | .procname = "print-fatal-signals",
|
| 1667 | .data = &print_fatal_signals,
|
| 1668 | .maxlen = sizeof(int),
|
| 1669 | .mode = 0644,
|
| 1670 | .proc_handler = proc_dointvec,
|
| 1671 | },
|
| 1672 | #ifdef CONFIG_SPARC
|
| 1673 | {
|
| 1674 | .procname = "reboot-cmd",
|
| 1675 | .data = reboot_command,
|
| 1676 | .maxlen = 256,
|
| 1677 | .mode = 0644,
|
| 1678 | .proc_handler = proc_dostring,
|
| 1679 | },
|
| 1680 | {
|
| 1681 | .procname = "stop-a",
|
| 1682 | .data = &stop_a_enabled,
|
| 1683 | .maxlen = sizeof (int),
|
| 1684 | .mode = 0644,
|
| 1685 | .proc_handler = proc_dointvec,
|
| 1686 | },
|
| 1687 | {
|
| 1688 | .procname = "scons-poweroff",
|
| 1689 | .data = &scons_pwroff,
|
| 1690 | .maxlen = sizeof (int),
|
| 1691 | .mode = 0644,
|
| 1692 | .proc_handler = proc_dointvec,
|
| 1693 | },
|
| 1694 | #endif
|
| 1695 | #ifdef CONFIG_SPARC64
|
| 1696 | {
|
| 1697 | .procname = "tsb-ratio",
|
| 1698 | .data = &sysctl_tsb_ratio,
|
| 1699 | .maxlen = sizeof (int),
|
| 1700 | .mode = 0644,
|
| 1701 | .proc_handler = proc_dointvec,
|
| 1702 | },
|
| 1703 | #endif
|
| 1704 | #ifdef CONFIG_PARISC
|
| 1705 | {
|
| 1706 | .procname = "soft-power",
|
| 1707 | .data = &pwrsw_enabled,
|
| 1708 | .maxlen = sizeof (int),
|
| 1709 | .mode = 0644,
|
| 1710 | .proc_handler = proc_dointvec,
|
| 1711 | },
|
| 1712 | #endif
|
| 1713 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
|
| 1714 | {
|
| 1715 | .procname = "unaligned-trap",
|
| 1716 | .data = &unaligned_enabled,
|
| 1717 | .maxlen = sizeof (int),
|
| 1718 | .mode = 0644,
|
| 1719 | .proc_handler = proc_dointvec,
|
| 1720 | },
|
| 1721 | #endif
|
| 1722 | #ifdef CONFIG_STACK_TRACER
|
| 1723 | {
|
| 1724 | .procname = "stack_tracer_enabled",
|
| 1725 | .data = &stack_tracer_enabled,
|
| 1726 | .maxlen = sizeof(int),
|
| 1727 | .mode = 0644,
|
| 1728 | .proc_handler = stack_trace_sysctl,
|
| 1729 | },
|
| 1730 | #endif
|
| 1731 | #ifdef CONFIG_TRACING
|
| 1732 | {
|
| 1733 | .procname = "ftrace_dump_on_oops",
|
| 1734 | .data = &ftrace_dump_on_oops,
|
| 1735 | .maxlen = sizeof(int),
|
| 1736 | .mode = 0644,
|
| 1737 | .proc_handler = proc_dointvec,
|
| 1738 | },
|
| 1739 | {
|
| 1740 | .procname = "traceoff_on_warning",
|
| 1741 | .data = &__disable_trace_on_warning,
|
| 1742 | .maxlen = sizeof(__disable_trace_on_warning),
|
| 1743 | .mode = 0644,
|
| 1744 | .proc_handler = proc_dointvec,
|
| 1745 | },
|
| 1746 | {
|
| 1747 | .procname = "tracepoint_printk",
|
| 1748 | .data = &tracepoint_printk,
|
| 1749 | .maxlen = sizeof(tracepoint_printk),
|
| 1750 | .mode = 0644,
|
| 1751 | .proc_handler = tracepoint_printk_sysctl,
|
| 1752 | },
|
| 1753 | #endif
|
| 1754 | #ifdef CONFIG_MODULES
|
| 1755 | {
|
| 1756 | .procname = "modprobe",
|
| 1757 | .data = &modprobe_path,
|
| 1758 | .maxlen = KMOD_PATH_LEN,
|
| 1759 | .mode = 0644,
|
| 1760 | .proc_handler = proc_dostring,
|
| 1761 | },
|
| 1762 | {
|
| 1763 | .procname = "modules_disabled",
|
| 1764 | .data = &modules_disabled,
|
| 1765 | .maxlen = sizeof(int),
|
| 1766 | .mode = 0644,
|
| 1767 |
|
| 1768 | .proc_handler = proc_dointvec_minmax,
|
| 1769 | .extra1 = SYSCTL_ONE,
|
| 1770 | .extra2 = SYSCTL_ONE,
|
| 1771 | },
|
| 1772 | #endif
|
| 1773 | #ifdef CONFIG_UEVENT_HELPER
|
| 1774 | {
|
| 1775 | .procname = "hotplug",
|
| 1776 | .data = &uevent_helper,
|
| 1777 | .maxlen = UEVENT_HELPER_PATH_LEN,
|
| 1778 | .mode = 0644,
|
| 1779 | .proc_handler = proc_dostring,
|
| 1780 | },
|
| 1781 | #endif
|
| 1782 | #ifdef CONFIG_MAGIC_SYSRQ
|
| 1783 | {
|
| 1784 | .procname = "sysrq",
|
| 1785 | .data = NULL,
|
| 1786 | .maxlen = sizeof (int),
|
| 1787 | .mode = 0644,
|
| 1788 | .proc_handler = sysrq_sysctl_handler,
|
| 1789 | },
|
| 1790 | #endif
|
| 1791 | #ifdef CONFIG_PROC_SYSCTL
|
| 1792 | {
|
| 1793 | .procname = "cad_pid",
|
| 1794 | .data = NULL,
|
| 1795 | .maxlen = sizeof (int),
|
| 1796 | .mode = 0600,
|
| 1797 | .proc_handler = proc_do_cad_pid,
|
| 1798 | },
|
| 1799 | #endif
|
| 1800 | {
|
| 1801 | .procname = "threads-max",
|
| 1802 | .data = NULL,
|
| 1803 | .maxlen = sizeof(int),
|
| 1804 | .mode = 0644,
|
| 1805 | .proc_handler = sysctl_max_threads,
|
| 1806 | },
|
| 1807 | {
|
| 1808 | .procname = "usermodehelper",
|
| 1809 | .mode = 0555,
|
| 1810 | .child = usermodehelper_table,
|
| 1811 | },
|
| 1812 | {
|
| 1813 | .procname = "overflowuid",
|
| 1814 | .data = &overflowuid,
|
| 1815 | .maxlen = sizeof(int),
|
| 1816 | .mode = 0644,
|
| 1817 | .proc_handler = proc_dointvec_minmax,
|
| 1818 | .extra1 = SYSCTL_ZERO,
|
| 1819 | .extra2 = SYSCTL_MAXOLDUID,
|
| 1820 | },
|
| 1821 | {
|
| 1822 | .procname = "overflowgid",
|
| 1823 | .data = &overflowgid,
|
| 1824 | .maxlen = sizeof(int),
|
| 1825 | .mode = 0644,
|
| 1826 | .proc_handler = proc_dointvec_minmax,
|
| 1827 | .extra1 = SYSCTL_ZERO,
|
| 1828 | .extra2 = SYSCTL_MAXOLDUID,
|
| 1829 | },
|
| 1830 | #ifdef CONFIG_S390
|
| 1831 | {
|
| 1832 | .procname = "userprocess_debug",
|
| 1833 | .data = &show_unhandled_signals,
|
| 1834 | .maxlen = sizeof(int),
|
| 1835 | .mode = 0644,
|
| 1836 | .proc_handler = proc_dointvec,
|
| 1837 | },
|
| 1838 | #endif
|
| 1839 | {
|
| 1840 | .procname = "pid_max",
|
| 1841 | .data = &pid_max,
|
| 1842 | .maxlen = sizeof (int),
|
| 1843 | .mode = 0644,
|
| 1844 | .proc_handler = proc_dointvec_minmax,
|
| 1845 | .extra1 = &pid_max_min,
|
| 1846 | .extra2 = &pid_max_max,
|
| 1847 | },
|
| 1848 | {
|
| 1849 | .procname = "panic_on_oops",
|
| 1850 | .data = &panic_on_oops,
|
| 1851 | .maxlen = sizeof(int),
|
| 1852 | .mode = 0644,
|
| 1853 | .proc_handler = proc_dointvec,
|
| 1854 | },
|
| 1855 | {
|
| 1856 | .procname = "panic_print",
|
| 1857 | .data = &panic_print,
|
| 1858 | .maxlen = sizeof(unsigned long),
|
| 1859 | .mode = 0644,
|
| 1860 | .proc_handler = proc_doulongvec_minmax,
|
| 1861 | },
|
| 1862 | {
|
| 1863 | .procname = "ngroups_max",
|
| 1864 | .data = (void *)&ngroups_max,
|
| 1865 | .maxlen = sizeof (int),
|
| 1866 | .mode = 0444,
|
| 1867 | .proc_handler = proc_dointvec,
|
| 1868 | },
|
| 1869 | {
|
| 1870 | .procname = "cap_last_cap",
|
| 1871 | .data = (void *)&cap_last_cap,
|
| 1872 | .maxlen = sizeof(int),
|
| 1873 | .mode = 0444,
|
| 1874 | .proc_handler = proc_dointvec,
|
| 1875 | },
|
| 1876 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
|
| 1877 | {
|
| 1878 | .procname = "unknown_nmi_panic",
|
| 1879 | .data = &unknown_nmi_panic,
|
| 1880 | .maxlen = sizeof (int),
|
| 1881 | .mode = 0644,
|
| 1882 | .proc_handler = proc_dointvec,
|
| 1883 | },
|
| 1884 | #endif
|
| 1885 |
|
| 1886 | #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
|
| 1887 | defined(CONFIG_DEBUG_STACKOVERFLOW)
|
| 1888 | {
|
| 1889 | .procname = "panic_on_stackoverflow",
|
| 1890 | .data = &sysctl_panic_on_stackoverflow,
|
| 1891 | .maxlen = sizeof(int),
|
| 1892 | .mode = 0644,
|
| 1893 | .proc_handler = proc_dointvec,
|
| 1894 | },
|
| 1895 | #endif
|
| 1896 | #if defined(CONFIG_X86)
|
| 1897 | {
|
| 1898 | .procname = "panic_on_unrecovered_nmi",
|
| 1899 | .data = &panic_on_unrecovered_nmi,
|
| 1900 | .maxlen = sizeof(int),
|
| 1901 | .mode = 0644,
|
| 1902 | .proc_handler = proc_dointvec,
|
| 1903 | },
|
| 1904 | {
|
| 1905 | .procname = "panic_on_io_nmi",
|
| 1906 | .data = &panic_on_io_nmi,
|
| 1907 | .maxlen = sizeof(int),
|
| 1908 | .mode = 0644,
|
| 1909 | .proc_handler = proc_dointvec,
|
| 1910 | },
|
| 1911 | {
|
| 1912 | .procname = "bootloader_type",
|
| 1913 | .data = &bootloader_type,
|
| 1914 | .maxlen = sizeof (int),
|
| 1915 | .mode = 0444,
|
| 1916 | .proc_handler = proc_dointvec,
|
| 1917 | },
|
| 1918 | {
|
| 1919 | .procname = "bootloader_version",
|
| 1920 | .data = &bootloader_version,
|
| 1921 | .maxlen = sizeof (int),
|
| 1922 | .mode = 0444,
|
| 1923 | .proc_handler = proc_dointvec,
|
| 1924 | },
|
| 1925 | {
|
| 1926 | .procname = "io_delay_type",
|
| 1927 | .data = &io_delay_type,
|
| 1928 | .maxlen = sizeof(int),
|
| 1929 | .mode = 0644,
|
| 1930 | .proc_handler = proc_dointvec,
|
| 1931 | },
|
| 1932 | #endif
|
| 1933 | #if defined(CONFIG_MMU)
|
| 1934 | {
|
| 1935 | .procname = "randomize_va_space",
|
| 1936 | .data = &randomize_va_space,
|
| 1937 | .maxlen = sizeof(int),
|
| 1938 | .mode = 0644,
|
| 1939 | .proc_handler = proc_dointvec,
|
| 1940 | },
|
| 1941 | #endif
|
| 1942 | #if defined(CONFIG_S390) && defined(CONFIG_SMP)
|
| 1943 | {
|
| 1944 | .procname = "spin_retry",
|
| 1945 | .data = &spin_retry,
|
| 1946 | .maxlen = sizeof (int),
|
| 1947 | .mode = 0644,
|
| 1948 | .proc_handler = proc_dointvec,
|
| 1949 | },
|
| 1950 | #endif
|
| 1951 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
|
| 1952 | {
|
| 1953 | .procname = "acpi_video_flags",
|
| 1954 | .data = &acpi_realmode_flags,
|
| 1955 | .maxlen = sizeof (unsigned long),
|
| 1956 | .mode = 0644,
|
| 1957 | .proc_handler = proc_doulongvec_minmax,
|
| 1958 | },
|
| 1959 | #endif
|
| 1960 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
|
| 1961 | {
|
| 1962 | .procname = "ignore-unaligned-usertrap",
|
| 1963 | .data = &no_unaligned_warning,
|
| 1964 | .maxlen = sizeof (int),
|
| 1965 | .mode = 0644,
|
| 1966 | .proc_handler = proc_dointvec,
|
| 1967 | },
|
| 1968 | #endif
|
| 1969 | #ifdef CONFIG_IA64
|
| 1970 | {
|
| 1971 | .procname = "unaligned-dump-stack",
|
| 1972 | .data = &unaligned_dump_stack,
|
| 1973 | .maxlen = sizeof (int),
|
| 1974 | .mode = 0644,
|
| 1975 | .proc_handler = proc_dointvec,
|
| 1976 | },
|
| 1977 | #endif
|
| 1978 | #ifdef CONFIG_RT_MUTEXES
|
| 1979 | {
|
| 1980 | .procname = "max_lock_depth",
|
| 1981 | .data = &max_lock_depth,
|
| 1982 | .maxlen = sizeof(int),
|
| 1983 | .mode = 0644,
|
| 1984 | .proc_handler = proc_dointvec,
|
| 1985 | },
|
| 1986 | #endif
|
| 1987 | #ifdef CONFIG_KEYS
|
| 1988 | {
|
| 1989 | .procname = "keys",
|
| 1990 | .mode = 0555,
|
| 1991 | .child = key_sysctls,
|
| 1992 | },
|
| 1993 | #endif
|
| 1994 | #ifdef CONFIG_PERF_EVENTS
|
| 1995 | |
| 1996 | * User-space scripts rely on the existence of this file
|
| 1997 | * as a feature check for perf_events being enabled.
|
| 1998 | *
|
| 1999 | * So it's an ABI, do not remove!
|
| 2000 |
|
| 2001 | {
|
| 2002 | .procname = "perf_event_paranoid",
|
| 2003 | .data = &sysctl_perf_event_paranoid,
|
| 2004 | .maxlen = sizeof(sysctl_perf_event_paranoid),
|
| 2005 | .mode = 0644,
|
| 2006 | .proc_handler = proc_dointvec,
|
| 2007 | },
|
| 2008 | {
|
| 2009 | .procname = "perf_event_mlock_kb",
|
| 2010 | .data = &sysctl_perf_event_mlock,
|
| 2011 | .maxlen = sizeof(sysctl_perf_event_mlock),
|
| 2012 | .mode = 0644,
|
| 2013 | .proc_handler = proc_dointvec,
|
| 2014 | },
|
| 2015 | {
|
| 2016 | .procname = "perf_event_max_sample_rate",
|
| 2017 | .data = &sysctl_perf_event_sample_rate,
|
| 2018 | .maxlen = sizeof(sysctl_perf_event_sample_rate),
|
| 2019 | .mode = 0644,
|
| 2020 | .proc_handler = perf_proc_update_handler,
|
| 2021 | .extra1 = SYSCTL_ONE,
|
| 2022 | },
|
| 2023 | {
|
| 2024 | .procname = "perf_cpu_time_max_percent",
|
| 2025 | .data = &sysctl_perf_cpu_time_max_percent,
|
| 2026 | .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
|
| 2027 | .mode = 0644,
|
| 2028 | .proc_handler = perf_cpu_time_max_percent_handler,
|
| 2029 | .extra1 = SYSCTL_ZERO,
|
| 2030 | .extra2 = SYSCTL_ONE_HUNDRED,
|
| 2031 | },
|
| 2032 | {
|
| 2033 | .procname = "perf_event_max_stack",
|
| 2034 | .data = &sysctl_perf_event_max_stack,
|
| 2035 | .maxlen = sizeof(sysctl_perf_event_max_stack),
|
| 2036 | .mode = 0644,
|
| 2037 | .proc_handler = perf_event_max_stack_handler,
|
| 2038 | .extra1 = SYSCTL_ZERO,
|
| 2039 | .extra2 = (void *)&six_hundred_forty_kb,
|
| 2040 | },
|
| 2041 | {
|
| 2042 | .procname = "perf_event_max_contexts_per_stack",
|
| 2043 | .data = &sysctl_perf_event_max_contexts_per_stack,
|
| 2044 | .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
|
| 2045 | .mode = 0644,
|
| 2046 | .proc_handler = perf_event_max_stack_handler,
|
| 2047 | .extra1 = SYSCTL_ZERO,
|
| 2048 | .extra2 = SYSCTL_ONE_THOUSAND,
|
| 2049 | },
|
| 2050 | #endif
|
| 2051 | {
|
| 2052 | .procname = "panic_on_warn",
|
| 2053 | .data = &panic_on_warn,
|
| 2054 | .maxlen = sizeof(int),
|
| 2055 | .mode = 0644,
|
| 2056 | .proc_handler = proc_dointvec_minmax,
|
| 2057 | .extra1 = SYSCTL_ZERO,
|
| 2058 | .extra2 = SYSCTL_ONE,
|
| 2059 | },
|
| 2060 | #ifdef CONFIG_TREE_RCU
|
| 2061 | {
|
| 2062 | .procname = "panic_on_rcu_stall",
|
| 2063 | .data = &sysctl_panic_on_rcu_stall,
|
| 2064 | .maxlen = sizeof(sysctl_panic_on_rcu_stall),
|
| 2065 | .mode = 0644,
|
| 2066 | .proc_handler = proc_dointvec_minmax,
|
| 2067 | .extra1 = SYSCTL_ZERO,
|
| 2068 | .extra2 = SYSCTL_ONE,
|
| 2069 | },
|
| 2070 | {
|
| 2071 | .procname = "max_rcu_stall_to_panic",
|
| 2072 | .data = &sysctl_max_rcu_stall_to_panic,
|
| 2073 | .maxlen = sizeof(sysctl_max_rcu_stall_to_panic),
|
| 2074 | .mode = 0644,
|
| 2075 | .proc_handler = proc_dointvec_minmax,
|
| 2076 | .extra1 = SYSCTL_ONE,
|
| 2077 | .extra2 = SYSCTL_INT_MAX,
|
| 2078 | },
|
| 2079 | #endif
|
| 2080 | { }
|
| 2081 | };
|
| 2082 |
|
| 2083 | static struct ctl_table vm_table[] = {
|
| 2084 | {
|
| 2085 | .procname = "overcommit_memory",
|
| 2086 | .data = &sysctl_overcommit_memory,
|
| 2087 | .maxlen = sizeof(sysctl_overcommit_memory),
|
| 2088 | .mode = 0644,
|
| 2089 | .proc_handler = overcommit_policy_handler,
|
| 2090 | .extra1 = SYSCTL_ZERO,
|
| 2091 | .extra2 = SYSCTL_TWO,
|
| 2092 | },
|
| 2093 | {
|
| 2094 | .procname = "overcommit_ratio",
|
| 2095 | .data = &sysctl_overcommit_ratio,
|
| 2096 | .maxlen = sizeof(sysctl_overcommit_ratio),
|
| 2097 | .mode = 0644,
|
| 2098 | .proc_handler = overcommit_ratio_handler,
|
| 2099 | },
|
| 2100 | {
|
| 2101 | .procname = "overcommit_kbytes",
|
| 2102 | .data = &sysctl_overcommit_kbytes,
|
| 2103 | .maxlen = sizeof(sysctl_overcommit_kbytes),
|
| 2104 | .mode = 0644,
|
| 2105 | .proc_handler = overcommit_kbytes_handler,
|
| 2106 | },
|
| 2107 | {
|
| 2108 | .procname = "page-cluster",
|
| 2109 | .data = &page_cluster,
|
| 2110 | .maxlen = sizeof(int),
|
| 2111 | .mode = 0644,
|
| 2112 | .proc_handler = proc_dointvec_minmax,
|
| 2113 | .extra1 = SYSCTL_ZERO,
|
| 2114 | .extra2 = (void *)&page_cluster_max,
|
| 2115 | },
|
| 2116 | {
|
| 2117 | .procname = "dirtytime_expire_seconds",
|
| 2118 | .data = &dirtytime_expire_interval,
|
| 2119 | .maxlen = sizeof(dirtytime_expire_interval),
|
| 2120 | .mode = 0644,
|
| 2121 | .proc_handler = dirtytime_interval_handler,
|
| 2122 | .extra1 = SYSCTL_ZERO,
|
| 2123 | },
|
| 2124 | {
|
| 2125 | .procname = "swappiness",
|
| 2126 | .data = &vm_swappiness,
|
| 2127 | .maxlen = sizeof(vm_swappiness),
|
| 2128 | .mode = 0644,
|
| 2129 | .proc_handler = proc_dointvec_minmax,
|
| 2130 | .extra1 = SYSCTL_ZERO,
|
| 2131 | .extra2 = SYSCTL_TWO_HUNDRED,
|
| 2132 | },
|
| 2133 | #ifdef CONFIG_NUMA
|
| 2134 | {
|
| 2135 | .procname = "numa_stat",
|
| 2136 | .data = &sysctl_vm_numa_stat,
|
| 2137 | .maxlen = sizeof(int),
|
| 2138 | .mode = 0644,
|
| 2139 | .proc_handler = sysctl_vm_numa_stat_handler,
|
| 2140 | .extra1 = SYSCTL_ZERO,
|
| 2141 | .extra2 = SYSCTL_ONE,
|
| 2142 | },
|
| 2143 | #endif
|
| 2144 | #ifdef CONFIG_HUGETLB_PAGE
|
| 2145 | {
|
| 2146 | .procname = "nr_hugepages",
|
| 2147 | .data = NULL,
|
| 2148 | .maxlen = sizeof(unsigned long),
|
| 2149 | .mode = 0644,
|
| 2150 | .proc_handler = hugetlb_sysctl_handler,
|
| 2151 | },
|
| 2152 | #ifdef CONFIG_NUMA
|
| 2153 | {
|
| 2154 | .procname = "nr_hugepages_mempolicy",
|
| 2155 | .data = NULL,
|
| 2156 | .maxlen = sizeof(unsigned long),
|
| 2157 | .mode = 0644,
|
| 2158 | .proc_handler = &hugetlb_mempolicy_sysctl_handler,
|
| 2159 | },
|
| 2160 | #endif
|
| 2161 | {
|
| 2162 | .procname = "hugetlb_shm_group",
|
| 2163 | .data = &sysctl_hugetlb_shm_group,
|
| 2164 | .maxlen = sizeof(gid_t),
|
| 2165 | .mode = 0644,
|
| 2166 | .proc_handler = proc_dointvec,
|
| 2167 | },
|
| 2168 | {
|
| 2169 | .procname = "nr_overcommit_hugepages",
|
| 2170 | .data = NULL,
|
| 2171 | .maxlen = sizeof(unsigned long),
|
| 2172 | .mode = 0644,
|
| 2173 | .proc_handler = hugetlb_overcommit_handler,
|
| 2174 | },
|
| 2175 | #endif
|
| 2176 | {
|
| 2177 | .procname = "lowmem_reserve_ratio",
|
| 2178 | .data = &sysctl_lowmem_reserve_ratio,
|
| 2179 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
|
| 2180 | .mode = 0644,
|
| 2181 | .proc_handler = lowmem_reserve_ratio_sysctl_handler,
|
| 2182 | },
|
| 2183 | {
|
| 2184 | .procname = "drop_caches",
|
| 2185 | .data = &sysctl_drop_caches,
|
| 2186 | .maxlen = sizeof(int),
|
| 2187 | .mode = 0200,
|
| 2188 | .proc_handler = drop_caches_sysctl_handler,
|
| 2189 | .extra1 = SYSCTL_ONE,
|
| 2190 | .extra2 = SYSCTL_FOUR,
|
| 2191 | },
|
| 2192 | #ifdef CONFIG_COMPACTION
|
| 2193 | {
|
| 2194 | .procname = "compact_memory",
|
| 2195 | .data = NULL,
|
| 2196 | .maxlen = sizeof(int),
|
| 2197 | .mode = 0200,
|
| 2198 | .proc_handler = sysctl_compaction_handler,
|
| 2199 | },
|
| 2200 | {
|
| 2201 | .procname = "compaction_proactiveness",
|
| 2202 | .data = &sysctl_compaction_proactiveness,
|
| 2203 | .maxlen = sizeof(sysctl_compaction_proactiveness),
|
| 2204 | .mode = 0644,
|
| 2205 | .proc_handler = compaction_proactiveness_sysctl_handler,
|
| 2206 | .extra1 = SYSCTL_ZERO,
|
| 2207 | .extra2 = SYSCTL_ONE_HUNDRED,
|
| 2208 | },
|
| 2209 | {
|
| 2210 | .procname = "extfrag_threshold",
|
| 2211 | .data = &sysctl_extfrag_threshold,
|
| 2212 | .maxlen = sizeof(int),
|
| 2213 | .mode = 0644,
|
| 2214 | .proc_handler = proc_dointvec_minmax,
|
| 2215 | .extra1 = SYSCTL_ZERO,
|
| 2216 | .extra2 = SYSCTL_ONE_THOUSAND,
|
| 2217 | },
|
| 2218 | {
|
| 2219 | .procname = "compact_unevictable_allowed",
|
| 2220 | .data = &sysctl_compact_unevictable_allowed,
|
| 2221 | .maxlen = sizeof(int),
|
| 2222 | .mode = 0644,
|
| 2223 | .proc_handler = proc_dointvec_minmax_warn_RT_change,
|
| 2224 | .extra1 = SYSCTL_ZERO,
|
| 2225 | .extra2 = SYSCTL_ONE,
|
| 2226 | },
|
| 2227 |
|
| 2228 | #endif
|
| 2229 | {
|
| 2230 | .procname = "min_free_kbytes",
|
| 2231 | .data = &min_free_kbytes,
|
| 2232 | .maxlen = sizeof(min_free_kbytes),
|
| 2233 | .mode = 0644,
|
| 2234 | .proc_handler = min_free_kbytes_sysctl_handler,
|
| 2235 | .extra1 = SYSCTL_ZERO,
|
| 2236 | },
|
| 2237 | {
|
| 2238 | .procname = "watermark_boost_factor",
|
| 2239 | .data = &watermark_boost_factor,
|
| 2240 | .maxlen = sizeof(watermark_boost_factor),
|
| 2241 | .mode = 0644,
|
| 2242 | .proc_handler = proc_dointvec_minmax,
|
| 2243 | .extra1 = SYSCTL_ZERO,
|
| 2244 | },
|
| 2245 | {
|
| 2246 | .procname = "watermark_scale_factor",
|
| 2247 | .data = &watermark_scale_factor,
|
| 2248 | .maxlen = sizeof(watermark_scale_factor),
|
| 2249 | .mode = 0644,
|
| 2250 | .proc_handler = watermark_scale_factor_sysctl_handler,
|
| 2251 | .extra1 = SYSCTL_ONE,
|
| 2252 | .extra2 = SYSCTL_THREE_THOUSAND,
|
| 2253 | },
|
| 2254 | {
|
| 2255 | .procname = "percpu_pagelist_high_fraction",
|
| 2256 | .data = &percpu_pagelist_high_fraction,
|
| 2257 | .maxlen = sizeof(percpu_pagelist_high_fraction),
|
| 2258 | .mode = 0644,
|
| 2259 | .proc_handler = percpu_pagelist_high_fraction_sysctl_handler,
|
| 2260 | .extra1 = SYSCTL_ZERO,
|
| 2261 | },
|
| 2262 | {
|
| 2263 | .procname = "page_lock_unfairness",
|
| 2264 | .data = &sysctl_page_lock_unfairness,
|
| 2265 | .maxlen = sizeof(sysctl_page_lock_unfairness),
|
| 2266 | .mode = 0644,
|
| 2267 | .proc_handler = proc_dointvec_minmax,
|
| 2268 | .extra1 = SYSCTL_ZERO,
|
| 2269 | },
|
| 2270 | #ifdef CONFIG_MMU
|
| 2271 | {
|
| 2272 | .procname = "max_map_count",
|
| 2273 | .data = &sysctl_max_map_count,
|
| 2274 | .maxlen = sizeof(sysctl_max_map_count),
|
| 2275 | .mode = 0644,
|
| 2276 | .proc_handler = proc_dointvec_minmax,
|
| 2277 | .extra1 = SYSCTL_ZERO,
|
| 2278 | },
|
| 2279 | #else
|
| 2280 | {
|
| 2281 | .procname = "nr_trim_pages",
|
| 2282 | .data = &sysctl_nr_trim_pages,
|
| 2283 | .maxlen = sizeof(sysctl_nr_trim_pages),
|
| 2284 | .mode = 0644,
|
| 2285 | .proc_handler = proc_dointvec_minmax,
|
| 2286 | .extra1 = SYSCTL_ZERO,
|
| 2287 | },
|
| 2288 | #endif
|
| 2289 | {
|
| 2290 | .procname = "vfs_cache_pressure",
|
| 2291 | .data = &sysctl_vfs_cache_pressure,
|
| 2292 | .maxlen = sizeof(sysctl_vfs_cache_pressure),
|
| 2293 | .mode = 0644,
|
| 2294 | .proc_handler = proc_dointvec_minmax,
|
| 2295 | .extra1 = SYSCTL_ZERO,
|
| 2296 | },
|
| 2297 | #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
|
| 2298 | defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
|
| 2299 | {
|
| 2300 | .procname = "legacy_va_layout",
|
| 2301 | .data = &sysctl_legacy_va_layout,
|
| 2302 | .maxlen = sizeof(sysctl_legacy_va_layout),
|
| 2303 | .mode = 0644,
|
| 2304 | .proc_handler = proc_dointvec_minmax,
|
| 2305 | .extra1 = SYSCTL_ZERO,
|
| 2306 | },
|
| 2307 | #endif
|
| 2308 | #ifdef CONFIG_NUMA
|
| 2309 | {
|
| 2310 | .procname = "zone_reclaim_mode",
|
| 2311 | .data = &node_reclaim_mode,
|
| 2312 | .maxlen = sizeof(node_reclaim_mode),
|
| 2313 | .mode = 0644,
|
| 2314 | .proc_handler = proc_dointvec_minmax,
|
| 2315 | .extra1 = SYSCTL_ZERO,
|
| 2316 | },
|
| 2317 | {
|
| 2318 | .procname = "min_unmapped_ratio",
|
| 2319 | .data = &sysctl_min_unmapped_ratio,
|
| 2320 | .maxlen = sizeof(sysctl_min_unmapped_ratio),
|
| 2321 | .mode = 0644,
|
| 2322 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
|
| 2323 | .extra1 = SYSCTL_ZERO,
|
| 2324 | .extra2 = SYSCTL_ONE_HUNDRED,
|
| 2325 | },
|
| 2326 | {
|
| 2327 | .procname = "min_slab_ratio",
|
| 2328 | .data = &sysctl_min_slab_ratio,
|
| 2329 | .maxlen = sizeof(sysctl_min_slab_ratio),
|
| 2330 | .mode = 0644,
|
| 2331 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
|
| 2332 | .extra1 = SYSCTL_ZERO,
|
| 2333 | .extra2 = SYSCTL_ONE_HUNDRED,
|
| 2334 | },
|
| 2335 | #endif
|
| 2336 | #ifdef CONFIG_SMP
|
| 2337 | {
|
| 2338 | .procname = "stat_interval",
|
| 2339 | .data = &sysctl_stat_interval,
|
| 2340 | .maxlen = sizeof(sysctl_stat_interval),
|
| 2341 | .mode = 0644,
|
| 2342 | .proc_handler = proc_dointvec_jiffies,
|
| 2343 | },
|
| 2344 | {
|
| 2345 | .procname = "stat_refresh",
|
| 2346 | .data = NULL,
|
| 2347 | .maxlen = 0,
|
| 2348 | .mode = 0600,
|
| 2349 | .proc_handler = vmstat_refresh,
|
| 2350 | },
|
| 2351 | #endif
|
| 2352 | #ifdef CONFIG_MMU
|
| 2353 | {
|
| 2354 | .procname = "mmap_min_addr",
|
| 2355 | .data = &dac_mmap_min_addr,
|
| 2356 | .maxlen = sizeof(unsigned long),
|
| 2357 | .mode = 0644,
|
| 2358 | .proc_handler = mmap_min_addr_handler,
|
| 2359 | },
|
| 2360 | #endif
|
| 2361 | #ifdef CONFIG_NUMA
|
| 2362 | {
|
| 2363 | .procname = "numa_zonelist_order",
|
| 2364 | .data = &numa_zonelist_order,
|
| 2365 | .maxlen = NUMA_ZONELIST_ORDER_LEN,
|
| 2366 | .mode = 0644,
|
| 2367 | .proc_handler = numa_zonelist_order_handler,
|
| 2368 | },
|
| 2369 | #endif
|
| 2370 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
|
| 2371 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
|
| 2372 | {
|
| 2373 | .procname = "vdso_enabled",
|
| 2374 | #ifdef CONFIG_X86_32
|
| 2375 | .data = &vdso32_enabled,
|
| 2376 | .maxlen = sizeof(vdso32_enabled),
|
| 2377 | #else
|
| 2378 | .data = &vdso_enabled,
|
| 2379 | .maxlen = sizeof(vdso_enabled),
|
| 2380 | #endif
|
| 2381 | .mode = 0644,
|
| 2382 | .proc_handler = proc_dointvec,
|
| 2383 | .extra1 = SYSCTL_ZERO,
|
| 2384 | },
|
| 2385 | #endif
|
| 2386 | #ifdef CONFIG_MEMORY_FAILURE
|
| 2387 | {
|
| 2388 | .procname = "memory_failure_early_kill",
|
| 2389 | .data = &sysctl_memory_failure_early_kill,
|
| 2390 | .maxlen = sizeof(sysctl_memory_failure_early_kill),
|
| 2391 | .mode = 0644,
|
| 2392 | .proc_handler = proc_dointvec_minmax,
|
| 2393 | .extra1 = SYSCTL_ZERO,
|
| 2394 | .extra2 = SYSCTL_ONE,
|
| 2395 | },
|
| 2396 | {
|
| 2397 | .procname = "memory_failure_recovery",
|
| 2398 | .data = &sysctl_memory_failure_recovery,
|
| 2399 | .maxlen = sizeof(sysctl_memory_failure_recovery),
|
| 2400 | .mode = 0644,
|
| 2401 | .proc_handler = proc_dointvec_minmax,
|
| 2402 | .extra1 = SYSCTL_ZERO,
|
| 2403 | .extra2 = SYSCTL_ONE,
|
| 2404 | },
|
| 2405 | #endif
|
| 2406 | {
|
| 2407 | .procname = "user_reserve_kbytes",
|
| 2408 | .data = &sysctl_user_reserve_kbytes,
|
| 2409 | .maxlen = sizeof(sysctl_user_reserve_kbytes),
|
| 2410 | .mode = 0644,
|
| 2411 | .proc_handler = proc_doulongvec_minmax,
|
| 2412 | },
|
| 2413 | {
|
| 2414 | .procname = "admin_reserve_kbytes",
|
| 2415 | .data = &sysctl_admin_reserve_kbytes,
|
| 2416 | .maxlen = sizeof(sysctl_admin_reserve_kbytes),
|
| 2417 | .mode = 0644,
|
| 2418 | .proc_handler = proc_doulongvec_minmax,
|
| 2419 | },
|
| 2420 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
|
| 2421 | {
|
| 2422 | .procname = "mmap_rnd_bits",
|
| 2423 | .data = &mmap_rnd_bits,
|
| 2424 | .maxlen = sizeof(mmap_rnd_bits),
|
| 2425 | .mode = 0600,
|
| 2426 | .proc_handler = proc_dointvec_minmax,
|
| 2427 | .extra1 = (void *)&mmap_rnd_bits_min,
|
| 2428 | .extra2 = (void *)&mmap_rnd_bits_max,
|
| 2429 | },
|
| 2430 | #endif
|
| 2431 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
|
| 2432 | {
|
| 2433 | .procname = "mmap_rnd_compat_bits",
|
| 2434 | .data = &mmap_rnd_compat_bits,
|
| 2435 | .maxlen = sizeof(mmap_rnd_compat_bits),
|
| 2436 | .mode = 0600,
|
| 2437 | .proc_handler = proc_dointvec_minmax,
|
| 2438 | .extra1 = (void *)&mmap_rnd_compat_bits_min,
|
| 2439 | .extra2 = (void *)&mmap_rnd_compat_bits_max,
|
| 2440 | },
|
| 2441 | #endif
|
| 2442 | #ifdef CONFIG_USERFAULTFD
|
| 2443 | {
|
| 2444 | .procname = "unprivileged_userfaultfd",
|
| 2445 | .data = &sysctl_unprivileged_userfaultfd,
|
| 2446 | .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
|
| 2447 | .mode = 0644,
|
| 2448 | .proc_handler = proc_dointvec_minmax,
|
| 2449 | .extra1 = SYSCTL_ZERO,
|
| 2450 | .extra2 = SYSCTL_ONE,
|
| 2451 | },
|
| 2452 | #endif
|
| 2453 | { }
|
| 2454 | };
|
| 2455 |
|
| 2456 | static struct ctl_table debug_table[] = {
|
| 2457 | #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
|
| 2458 | {
|
| 2459 | .procname = "exception-trace",
|
| 2460 | .data = &show_unhandled_signals,
|
| 2461 | .maxlen = sizeof(int),
|
| 2462 | .mode = 0644,
|
| 2463 | .proc_handler = proc_dointvec
|
| 2464 | },
|
| 2465 | #endif
|
| 2466 | { }
|
| 2467 | };
|
| 2468 |
|
| 2469 | static struct ctl_table dev_table[] = {
|
| 2470 | { }
|
| 2471 | };
|
| 2472 |
|
| 2473 | DECLARE_SYSCTL_BASE(kernel, kern_table);
|
| 2474 | DECLARE_SYSCTL_BASE(vm, vm_table);
|
| 2475 | DECLARE_SYSCTL_BASE(debug, debug_table);
|
| 2476 | DECLARE_SYSCTL_BASE(dev, dev_table);
|
| 2477 |
|
| 2478 | int __init sysctl_init_bases(void)
|
| 2479 | {
|
| 2480 | register_sysctl_base(kernel);
|
| 2481 | register_sysctl_base(vm);
|
| 2482 | register_sysctl_base(debug);
|
| 2483 | register_sysctl_base(dev);
|
| 2484 |
|
| 2485 | return 0;
|
| 2486 | }
|
| 2487 | #endif
|
| 2488 | |
| 2489 | * No sense putting this after each symbol definition, twice,
|
| 2490 | * exception granted :-)
|
| 2491 |
|
| 2492 | EXPORT_SYMBOL(proc_dobool);
|
| 2493 | EXPORT_SYMBOL(proc_dointvec);
|
| 2494 | EXPORT_SYMBOL(proc_douintvec);
|
| 2495 | EXPORT_SYMBOL(proc_dointvec_jiffies);
|
| 2496 | EXPORT_SYMBOL(proc_dointvec_minmax);
|
| 2497 | EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
|
| 2498 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
|
| 2499 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
|
| 2500 | EXPORT_SYMBOL(proc_dostring);
|
| 2501 | EXPORT_SYMBOL(proc_doulongvec_minmax);
|
| 2502 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
|
| 2503 | EXPORT_SYMBOL(proc_do_large_bitmap);
|