| 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/sysctl.h>
|
| 24 | #include <linux/bitmap.h>
|
| 25 | #include <linux/printk.h>
|
| 26 | #include <linux/proc_fs.h>
|
| 27 | #include <linux/security.h>
|
| 28 | #include <linux/ctype.h>
|
| 29 | #include <linux/filter.h>
|
| 30 | #include <linux/fs.h>
|
| 31 | #include <linux/init.h>
|
| 32 | #include <linux/kernel.h>
|
| 33 | #include <linux/kobject.h>
|
| 34 | #include <linux/net.h>
|
| 35 | #include <linux/sysrq.h>
|
| 36 | #include <linux/highuid.h>
|
| 37 | #include <linux/writeback.h>
|
| 38 | #include <linux/ratelimit.h>
|
| 39 | #include <linux/initrd.h>
|
| 40 | #include <linux/key.h>
|
| 41 | #include <linux/times.h>
|
| 42 | #include <linux/limits.h>
|
| 43 | #include <linux/syscalls.h>
|
| 44 | #include <linux/nfs_fs.h>
|
| 45 | #include <linux/acpi.h>
|
| 46 | #include <linux/reboot.h>
|
| 47 | #include <linux/kmod.h>
|
| 48 | #include <linux/capability.h>
|
| 49 | #include <linux/binfmts.h>
|
| 50 | #include <linux/sched/sysctl.h>
|
| 51 | #include <linux/mount.h>
|
| 52 | #include <linux/pid.h>
|
| 53 |
|
| 54 | #include "../lib/kstrtox.h"
|
| 55 |
|
| 56 | #include <linux/uaccess.h>
|
| 57 | #include <asm/processor.h>
|
| 58 |
|
| 59 | #ifdef CONFIG_X86
|
| 60 | #include <asm/nmi.h>
|
| 61 | #include <asm/io.h>
|
| 62 | #endif
|
| 63 | #ifdef CONFIG_RT_MUTEXES
|
| 64 | #include <linux/rtmutex.h>
|
| 65 | #endif
|
| 66 |
|
| 67 |
|
| 68 | const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535, -1 };
|
| 69 | EXPORT_SYMBOL(sysctl_vals);
|
| 70 |
|
| 71 | const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
|
| 72 | EXPORT_SYMBOL_GPL(sysctl_long_vals);
|
| 73 |
|
| 74 | #if defined(CONFIG_SYSCTL)
|
| 75 |
|
| 76 |
|
| 77 | static const int ngroups_max = NGROUPS_MAX;
|
| 78 | static const int cap_last_cap = CAP_LAST_CAP;
|
| 79 |
|
| 80 | #ifdef CONFIG_PROC_SYSCTL
|
| 81 |
|
| 82 | |
| 83 | * enum sysctl_writes_mode - supported sysctl write modes
|
| 84 | *
|
| 85 | * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
|
| 86 | * to be written, and multiple writes on the same sysctl file descriptor
|
| 87 | * will rewrite the sysctl value, regardless of file position. No warning
|
| 88 | * is issued when the initial position is not 0.
|
| 89 | * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
|
| 90 | * not 0.
|
| 91 | * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
|
| 92 | * file position 0 and the value must be fully contained in the buffer
|
| 93 | * sent to the write syscall. If dealing with strings respect the file
|
| 94 | * position, but restrict this to the max length of the buffer, anything
|
| 95 | * passed the max length will be ignored. Multiple writes will append
|
| 96 | * to the buffer.
|
| 97 | *
|
| 98 | * These write modes control how current file position affects the behavior of
|
| 99 | * updating sysctl values through the proc interface on each write.
|
| 100 |
|
| 101 | enum sysctl_writes_mode {
|
| 102 | SYSCTL_WRITES_LEGACY = -1,
|
| 103 | SYSCTL_WRITES_WARN = 0,
|
| 104 | SYSCTL_WRITES_STRICT = 1,
|
| 105 | };
|
| 106 |
|
| 107 | static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
|
| 108 | #endif
|
| 109 | #endif
|
| 110 |
|
| 111 | |
| 112 | * /proc/sys support
|
| 113 |
|
| 114 |
|
| 115 | #ifdef CONFIG_PROC_SYSCTL
|
| 116 |
|
| 117 | static int _proc_do_string(char *data, int maxlen, int write,
|
| 118 | char *buffer, size_t *lenp, loff_t *ppos)
|
| 119 | {
|
| 120 | size_t len;
|
| 121 | char c, *p;
|
| 122 |
|
| 123 | if (!data || !maxlen || !*lenp) {
|
| 124 | *lenp = 0;
|
| 125 | return 0;
|
| 126 | }
|
| 127 |
|
| 128 | if (write) {
|
| 129 | if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
|
| 130 |
|
| 131 | len = strlen(data);
|
| 132 | if (len > maxlen - 1)
|
| 133 | len = maxlen - 1;
|
| 134 |
|
| 135 | if (*ppos > len)
|
| 136 | return 0;
|
| 137 | len = *ppos;
|
| 138 | } else {
|
| 139 |
|
| 140 | len = 0;
|
| 141 | }
|
| 142 |
|
| 143 | *ppos += *lenp;
|
| 144 | p = buffer;
|
| 145 | while ((p - buffer) < *lenp && len < maxlen - 1) {
|
| 146 | c = *(p++);
|
| 147 | if (c == 0 || c == '\n')
|
| 148 | break;
|
| 149 | data[len++] = c;
|
| 150 | }
|
| 151 | data[len] = 0;
|
| 152 | } else {
|
| 153 | len = strlen(data);
|
| 154 | if (len > maxlen)
|
| 155 | len = maxlen;
|
| 156 |
|
| 157 | if (*ppos > len) {
|
| 158 | *lenp = 0;
|
| 159 | return 0;
|
| 160 | }
|
| 161 |
|
| 162 | data += *ppos;
|
| 163 | len -= *ppos;
|
| 164 |
|
| 165 | if (len > *lenp)
|
| 166 | len = *lenp;
|
| 167 | if (len)
|
| 168 | memcpy(buffer, data, len);
|
| 169 | if (len < *lenp) {
|
| 170 | buffer[len] = '\n';
|
| 171 | len++;
|
| 172 | }
|
| 173 | *lenp = len;
|
| 174 | *ppos += len;
|
| 175 | }
|
| 176 | return 0;
|
| 177 | }
|
| 178 |
|
| 179 | static void warn_sysctl_write(const struct ctl_table *table)
|
| 180 | {
|
| 181 | pr_warn_once("%s wrote to %s when file position was not 0!\n"
|
| 182 | "This will not be supported in the future. To silence this\n"
|
| 183 | "warning, set kernel.sysctl_writes_strict = -1\n",
|
| 184 | current->comm, table->procname);
|
| 185 | }
|
| 186 |
|
| 187 | |
| 188 | * proc_first_pos_non_zero_ignore - check if first position is allowed
|
| 189 | * @ppos: file position
|
| 190 | * @table: the sysctl table
|
| 191 | *
|
| 192 | * Returns true if the first position is non-zero and the sysctl_writes_strict
|
| 193 | * mode indicates this is not allowed for numeric input types. String proc
|
| 194 | * handlers can ignore the return value.
|
| 195 |
|
| 196 | static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
|
| 197 | const struct ctl_table *table)
|
| 198 | {
|
| 199 | if (!*ppos)
|
| 200 | return false;
|
| 201 |
|
| 202 | switch (sysctl_writes_strict) {
|
| 203 | case SYSCTL_WRITES_STRICT:
|
| 204 | return true;
|
| 205 | case SYSCTL_WRITES_WARN:
|
| 206 | warn_sysctl_write(table);
|
| 207 | return false;
|
| 208 | default:
|
| 209 | return false;
|
| 210 | }
|
| 211 | }
|
| 212 |
|
| 213 | |
| 214 | * proc_dostring - read a string sysctl
|
| 215 | * @table: the sysctl table
|
| 216 | * @write: %TRUE if this is a write to the sysctl file
|
| 217 | * @buffer: the user buffer
|
| 218 | * @lenp: the size of the user buffer
|
| 219 | * @ppos: file position
|
| 220 | *
|
| 221 | * Reads/writes a string from/to the user buffer. If the kernel
|
| 222 | * buffer provided is not large enough to hold the string, the
|
| 223 | * string is truncated. The copied string is %NULL-terminated.
|
| 224 | * If the string is being read by the user process, it is copied
|
| 225 | * and a newline '\n' is added. It is truncated if the buffer is
|
| 226 | * not large enough.
|
| 227 | *
|
| 228 | * Returns 0 on success.
|
| 229 |
|
| 230 | int proc_dostring(const struct ctl_table *table, int write,
|
| 231 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 232 | {
|
| 233 | if (write)
|
| 234 | proc_first_pos_non_zero_ignore(ppos, table);
|
| 235 |
|
| 236 | return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
|
| 237 | ppos);
|
| 238 | }
|
| 239 |
|
| 240 | static void proc_skip_spaces(char **buf, size_t *size)
|
| 241 | {
|
| 242 | while (*size) {
|
| 243 | if (!isspace(**buf))
|
| 244 | break;
|
| 245 | (*size)--;
|
| 246 | (*buf)++;
|
| 247 | }
|
| 248 | }
|
| 249 |
|
| 250 | static void proc_skip_char(char **buf, size_t *size, const char v)
|
| 251 | {
|
| 252 | while (*size) {
|
| 253 | if (**buf != v)
|
| 254 | break;
|
| 255 | (*size)--;
|
| 256 | (*buf)++;
|
| 257 | }
|
| 258 | }
|
| 259 |
|
| 260 | |
| 261 | * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
|
| 262 | * fail on overflow
|
| 263 | *
|
| 264 | * @cp: kernel buffer containing the string to parse
|
| 265 | * @endp: pointer to store the trailing characters
|
| 266 | * @base: the base to use
|
| 267 | * @res: where the parsed integer will be stored
|
| 268 | *
|
| 269 | * In case of success 0 is returned and @res will contain the parsed integer,
|
| 270 | * @endp will hold any trailing characters.
|
| 271 | * This function will fail the parse on overflow. If there wasn't an overflow
|
| 272 | * the function will defer the decision what characters count as invalid to the
|
| 273 | * caller.
|
| 274 |
|
| 275 | static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
|
| 276 | unsigned long *res)
|
| 277 | {
|
| 278 | unsigned long long result;
|
| 279 | unsigned int rv;
|
| 280 |
|
| 281 | cp = _parse_integer_fixup_radix(cp, &base);
|
| 282 | rv = _parse_integer(cp, base, &result);
|
| 283 | if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
|
| 284 | return -ERANGE;
|
| 285 |
|
| 286 | cp += rv;
|
| 287 |
|
| 288 | if (endp)
|
| 289 | *endp = (char *)cp;
|
| 290 |
|
| 291 | *res = (unsigned long)result;
|
| 292 | return 0;
|
| 293 | }
|
| 294 |
|
| 295 | #define TMPBUFLEN 22
|
| 296 | |
| 297 | * proc_get_long - reads an ASCII formatted integer from a user buffer
|
| 298 | *
|
| 299 | * @buf: a kernel buffer
|
| 300 | * @size: size of the kernel buffer
|
| 301 | * @val: this is where the number will be stored
|
| 302 | * @neg: set to %TRUE if number is negative
|
| 303 | * @perm_tr: a vector which contains the allowed trailers
|
| 304 | * @perm_tr_len: size of the perm_tr vector
|
| 305 | * @tr: pointer to store the trailer character
|
| 306 | *
|
| 307 | * In case of success %0 is returned and @buf and @size are updated with
|
| 308 | * the amount of bytes read. If @tr is non-NULL and a trailing
|
| 309 | * character exists (size is non-zero after returning from this
|
| 310 | * function), @tr is updated with the trailing character.
|
| 311 |
|
| 312 | static int proc_get_long(char **buf, size_t *size,
|
| 313 | unsigned long *val, bool *neg,
|
| 314 | const char *perm_tr, unsigned perm_tr_len, char *tr)
|
| 315 | {
|
| 316 | char *p, tmp[TMPBUFLEN];
|
| 317 | ssize_t len = *size;
|
| 318 |
|
| 319 | if (len <= 0)
|
| 320 | return -EINVAL;
|
| 321 |
|
| 322 | if (len > TMPBUFLEN - 1)
|
| 323 | len = TMPBUFLEN - 1;
|
| 324 |
|
| 325 | memcpy(tmp, *buf, len);
|
| 326 |
|
| 327 | tmp[len] = 0;
|
| 328 | p = tmp;
|
| 329 | if (*p == '-' && *size > 1) {
|
| 330 | *neg = true;
|
| 331 | p++;
|
| 332 | } else
|
| 333 | *neg = false;
|
| 334 | if (!isdigit(*p))
|
| 335 | return -EINVAL;
|
| 336 |
|
| 337 | if (strtoul_lenient(p, &p, 0, val))
|
| 338 | return -EINVAL;
|
| 339 |
|
| 340 | len = p - tmp;
|
| 341 |
|
| 342 | |
| 343 | * invalid integers (e.g. 1234...a) or two integers instead of one
|
| 344 | * (e.g. 123...1). So lets not allow such large numbers.
|
| 345 | if (len == TMPBUFLEN - 1)
|
| 346 | return -EINVAL;
|
| 347 |
|
| 348 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
|
| 349 | return -EINVAL;
|
| 350 |
|
| 351 | if (tr && (len < *size))
|
| 352 | *tr = *p;
|
| 353 |
|
| 354 | *buf += len;
|
| 355 | *size -= len;
|
| 356 |
|
| 357 | return 0;
|
| 358 | }
|
| 359 |
|
| 360 | |
| 361 | * proc_put_long - converts an integer to a decimal ASCII formatted string
|
| 362 | *
|
| 363 | * @buf: the user buffer
|
| 364 | * @size: the size of the user buffer
|
| 365 | * @val: the integer to be converted
|
| 366 | * @neg: sign of the number, %TRUE for negative
|
| 367 | *
|
| 368 | * In case of success @buf and @size are updated with the amount of bytes
|
| 369 | * written.
|
| 370 |
|
| 371 | static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
|
| 372 | {
|
| 373 | int len;
|
| 374 | char tmp[TMPBUFLEN], *p = tmp;
|
| 375 |
|
| 376 | sprintf(p, "%s%lu", neg ? "-" : "", val);
|
| 377 | len = strlen(tmp);
|
| 378 | if (len > *size)
|
| 379 | len = *size;
|
| 380 | memcpy(*buf, tmp, len);
|
| 381 | *size -= len;
|
| 382 | *buf += len;
|
| 383 | }
|
| 384 | #undef TMPBUFLEN
|
| 385 |
|
| 386 | static void proc_put_char(void **buf, size_t *size, char c)
|
| 387 | {
|
| 388 | if (*size) {
|
| 389 | char **buffer = (char **)buf;
|
| 390 | **buffer = c;
|
| 391 |
|
| 392 | (*size)--;
|
| 393 | (*buffer)++;
|
| 394 | *buf = *buffer;
|
| 395 | }
|
| 396 | }
|
| 397 |
|
| 398 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
|
| 399 | int *valp,
|
| 400 | int write, void *data)
|
| 401 | {
|
| 402 | if (write) {
|
| 403 | if (*negp) {
|
| 404 | if (*lvalp > (unsigned long) INT_MAX + 1)
|
| 405 | return -EINVAL;
|
| 406 | WRITE_ONCE(*valp, -*lvalp);
|
| 407 | } else {
|
| 408 | if (*lvalp > (unsigned long) INT_MAX)
|
| 409 | return -EINVAL;
|
| 410 | WRITE_ONCE(*valp, *lvalp);
|
| 411 | }
|
| 412 | } else {
|
| 413 | int val = READ_ONCE(*valp);
|
| 414 | if (val < 0) {
|
| 415 | *negp = true;
|
| 416 | *lvalp = -(unsigned long)val;
|
| 417 | } else {
|
| 418 | *negp = false;
|
| 419 | *lvalp = (unsigned long)val;
|
| 420 | }
|
| 421 | }
|
| 422 | return 0;
|
| 423 | }
|
| 424 |
|
| 425 | static int do_proc_douintvec_conv(unsigned long *lvalp,
|
| 426 | unsigned int *valp,
|
| 427 | int write, void *data)
|
| 428 | {
|
| 429 | if (write) {
|
| 430 | if (*lvalp > UINT_MAX)
|
| 431 | return -EINVAL;
|
| 432 | WRITE_ONCE(*valp, *lvalp);
|
| 433 | } else {
|
| 434 | unsigned int val = READ_ONCE(*valp);
|
| 435 | *lvalp = (unsigned long)val;
|
| 436 | }
|
| 437 | return 0;
|
| 438 | }
|
| 439 |
|
| 440 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
|
| 441 |
|
| 442 | static int __do_proc_dointvec(void *tbl_data, const struct ctl_table *table,
|
| 443 | int write, void *buffer,
|
| 444 | size_t *lenp, loff_t *ppos,
|
| 445 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
|
| 446 | int write, void *data),
|
| 447 | void *data)
|
| 448 | {
|
| 449 | int *i, vleft, first = 1, err = 0;
|
| 450 | size_t left;
|
| 451 | char *p;
|
| 452 |
|
| 453 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
| 454 | *lenp = 0;
|
| 455 | return 0;
|
| 456 | }
|
| 457 |
|
| 458 | i = (int *) tbl_data;
|
| 459 | vleft = table->maxlen / sizeof(*i);
|
| 460 | left = *lenp;
|
| 461 |
|
| 462 | if (!conv)
|
| 463 | conv = do_proc_dointvec_conv;
|
| 464 |
|
| 465 | if (write) {
|
| 466 | if (proc_first_pos_non_zero_ignore(ppos, table))
|
| 467 | goto out;
|
| 468 |
|
| 469 | if (left > PAGE_SIZE - 1)
|
| 470 | left = PAGE_SIZE - 1;
|
| 471 | p = buffer;
|
| 472 | }
|
| 473 |
|
| 474 | for (; left && vleft--; i++, first=0) {
|
| 475 | unsigned long lval;
|
| 476 | bool neg;
|
| 477 |
|
| 478 | if (write) {
|
| 479 | proc_skip_spaces(&p, &left);
|
| 480 |
|
| 481 | if (!left)
|
| 482 | break;
|
| 483 | err = proc_get_long(&p, &left, &lval, &neg,
|
| 484 | proc_wspace_sep,
|
| 485 | sizeof(proc_wspace_sep), NULL);
|
| 486 | if (err)
|
| 487 | break;
|
| 488 | if (conv(&neg, &lval, i, 1, data)) {
|
| 489 | err = -EINVAL;
|
| 490 | break;
|
| 491 | }
|
| 492 | } else {
|
| 493 | if (conv(&neg, &lval, i, 0, data)) {
|
| 494 | err = -EINVAL;
|
| 495 | break;
|
| 496 | }
|
| 497 | if (!first)
|
| 498 | proc_put_char(&buffer, &left, '\t');
|
| 499 | proc_put_long(&buffer, &left, lval, neg);
|
| 500 | }
|
| 501 | }
|
| 502 |
|
| 503 | if (!write && !first && left && !err)
|
| 504 | proc_put_char(&buffer, &left, '\n');
|
| 505 | if (write && !err && left)
|
| 506 | proc_skip_spaces(&p, &left);
|
| 507 | if (write && first)
|
| 508 | return err ? : -EINVAL;
|
| 509 | *lenp -= left;
|
| 510 | out:
|
| 511 | *ppos += *lenp;
|
| 512 | return err;
|
| 513 | }
|
| 514 |
|
| 515 | static int do_proc_dointvec(const struct ctl_table *table, int write,
|
| 516 | void *buffer, size_t *lenp, loff_t *ppos,
|
| 517 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
|
| 518 | int write, void *data),
|
| 519 | void *data)
|
| 520 | {
|
| 521 | return __do_proc_dointvec(table->data, table, write,
|
| 522 | buffer, lenp, ppos, conv, data);
|
| 523 | }
|
| 524 |
|
| 525 | static int do_proc_douintvec_w(unsigned int *tbl_data,
|
| 526 | const struct ctl_table *table,
|
| 527 | void *buffer,
|
| 528 | size_t *lenp, loff_t *ppos,
|
| 529 | int (*conv)(unsigned long *lvalp,
|
| 530 | unsigned int *valp,
|
| 531 | int write, void *data),
|
| 532 | void *data)
|
| 533 | {
|
| 534 | unsigned long lval;
|
| 535 | int err = 0;
|
| 536 | size_t left;
|
| 537 | bool neg;
|
| 538 | char *p = buffer;
|
| 539 |
|
| 540 | left = *lenp;
|
| 541 |
|
| 542 | if (proc_first_pos_non_zero_ignore(ppos, table))
|
| 543 | goto bail_early;
|
| 544 |
|
| 545 | if (left > PAGE_SIZE - 1)
|
| 546 | left = PAGE_SIZE - 1;
|
| 547 |
|
| 548 | proc_skip_spaces(&p, &left);
|
| 549 | if (!left) {
|
| 550 | err = -EINVAL;
|
| 551 | goto out_free;
|
| 552 | }
|
| 553 |
|
| 554 | err = proc_get_long(&p, &left, &lval, &neg,
|
| 555 | proc_wspace_sep,
|
| 556 | sizeof(proc_wspace_sep), NULL);
|
| 557 | if (err || neg) {
|
| 558 | err = -EINVAL;
|
| 559 | goto out_free;
|
| 560 | }
|
| 561 |
|
| 562 | if (conv(&lval, tbl_data, 1, data)) {
|
| 563 | err = -EINVAL;
|
| 564 | goto out_free;
|
| 565 | }
|
| 566 |
|
| 567 | if (!err && left)
|
| 568 | proc_skip_spaces(&p, &left);
|
| 569 |
|
| 570 | out_free:
|
| 571 | if (err)
|
| 572 | return -EINVAL;
|
| 573 |
|
| 574 | return 0;
|
| 575 |
|
| 576 |
|
| 577 | bail_early:
|
| 578 | *ppos += *lenp;
|
| 579 | return err;
|
| 580 | }
|
| 581 |
|
| 582 | static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
|
| 583 | size_t *lenp, loff_t *ppos,
|
| 584 | int (*conv)(unsigned long *lvalp,
|
| 585 | unsigned int *valp,
|
| 586 | int write, void *data),
|
| 587 | void *data)
|
| 588 | {
|
| 589 | unsigned long lval;
|
| 590 | int err = 0;
|
| 591 | size_t left;
|
| 592 |
|
| 593 | left = *lenp;
|
| 594 |
|
| 595 | if (conv(&lval, tbl_data, 0, data)) {
|
| 596 | err = -EINVAL;
|
| 597 | goto out;
|
| 598 | }
|
| 599 |
|
| 600 | proc_put_long(&buffer, &left, lval, false);
|
| 601 | if (!left)
|
| 602 | goto out;
|
| 603 |
|
| 604 | proc_put_char(&buffer, &left, '\n');
|
| 605 |
|
| 606 | out:
|
| 607 | *lenp -= left;
|
| 608 | *ppos += *lenp;
|
| 609 |
|
| 610 | return err;
|
| 611 | }
|
| 612 |
|
| 613 | static int __do_proc_douintvec(void *tbl_data, const struct ctl_table *table,
|
| 614 | int write, void *buffer,
|
| 615 | size_t *lenp, loff_t *ppos,
|
| 616 | int (*conv)(unsigned long *lvalp,
|
| 617 | unsigned int *valp,
|
| 618 | int write, void *data),
|
| 619 | void *data)
|
| 620 | {
|
| 621 | unsigned int *i, vleft;
|
| 622 |
|
| 623 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
| 624 | *lenp = 0;
|
| 625 | return 0;
|
| 626 | }
|
| 627 |
|
| 628 | i = (unsigned int *) tbl_data;
|
| 629 | vleft = table->maxlen / sizeof(*i);
|
| 630 |
|
| 631 | |
| 632 | * Arrays are not supported, keep this simple. *Do not* add
|
| 633 | * support for them.
|
| 634 |
|
| 635 | if (vleft != 1) {
|
| 636 | *lenp = 0;
|
| 637 | return -EINVAL;
|
| 638 | }
|
| 639 |
|
| 640 | if (!conv)
|
| 641 | conv = do_proc_douintvec_conv;
|
| 642 |
|
| 643 | if (write)
|
| 644 | return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
|
| 645 | conv, data);
|
| 646 | return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
|
| 647 | }
|
| 648 |
|
| 649 | int do_proc_douintvec(const struct ctl_table *table, int write,
|
| 650 | void *buffer, size_t *lenp, loff_t *ppos,
|
| 651 | int (*conv)(unsigned long *lvalp,
|
| 652 | unsigned int *valp,
|
| 653 | int write, void *data),
|
| 654 | void *data)
|
| 655 | {
|
| 656 | return __do_proc_douintvec(table->data, table, write,
|
| 657 | buffer, lenp, ppos, conv, data);
|
| 658 | }
|
| 659 |
|
| 660 | |
| 661 | * proc_dobool - read/write a bool
|
| 662 | * @table: the sysctl table
|
| 663 | * @write: %TRUE if this is a write to the sysctl file
|
| 664 | * @buffer: the user buffer
|
| 665 | * @lenp: the size of the user buffer
|
| 666 | * @ppos: file position
|
| 667 | *
|
| 668 | * Reads/writes one integer value from/to the user buffer,
|
| 669 | * treated as an ASCII string.
|
| 670 | *
|
| 671 | * table->data must point to a bool variable and table->maxlen must
|
| 672 | * be sizeof(bool).
|
| 673 | *
|
| 674 | * Returns 0 on success.
|
| 675 |
|
| 676 | int proc_dobool(const struct ctl_table *table, int write, void *buffer,
|
| 677 | size_t *lenp, loff_t *ppos)
|
| 678 | {
|
| 679 | struct ctl_table tmp;
|
| 680 | bool *data = table->data;
|
| 681 | int res, val;
|
| 682 |
|
| 683 |
|
| 684 | if (table->maxlen != sizeof(bool))
|
| 685 | return -EINVAL;
|
| 686 |
|
| 687 | tmp = *table;
|
| 688 | tmp.maxlen = sizeof(val);
|
| 689 | tmp.data = &val;
|
| 690 |
|
| 691 | val = READ_ONCE(*data);
|
| 692 | res = proc_dointvec(&tmp, write, buffer, lenp, ppos);
|
| 693 | if (res)
|
| 694 | return res;
|
| 695 | if (write)
|
| 696 | WRITE_ONCE(*data, val);
|
| 697 | return 0;
|
| 698 | }
|
| 699 |
|
| 700 | |
| 701 | * proc_dointvec - read a vector of integers
|
| 702 | * @table: the sysctl table
|
| 703 | * @write: %TRUE if this is a write to the sysctl file
|
| 704 | * @buffer: the user buffer
|
| 705 | * @lenp: the size of the user buffer
|
| 706 | * @ppos: file position
|
| 707 | *
|
| 708 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 709 | * values from/to the user buffer, treated as an ASCII string.
|
| 710 | *
|
| 711 | * Returns 0 on success.
|
| 712 |
|
| 713 | int proc_dointvec(const struct ctl_table *table, int write, void *buffer,
|
| 714 | size_t *lenp, loff_t *ppos)
|
| 715 | {
|
| 716 | return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
|
| 717 | }
|
| 718 |
|
| 719 | |
| 720 | * proc_douintvec - read a vector of unsigned integers
|
| 721 | * @table: the sysctl table
|
| 722 | * @write: %TRUE if this is a write to the sysctl file
|
| 723 | * @buffer: the user buffer
|
| 724 | * @lenp: the size of the user buffer
|
| 725 | * @ppos: file position
|
| 726 | *
|
| 727 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
|
| 728 | * values from/to the user buffer, treated as an ASCII string.
|
| 729 | *
|
| 730 | * Returns 0 on success.
|
| 731 |
|
| 732 | int proc_douintvec(const struct ctl_table *table, int write, void *buffer,
|
| 733 | size_t *lenp, loff_t *ppos)
|
| 734 | {
|
| 735 | return do_proc_douintvec(table, write, buffer, lenp, ppos,
|
| 736 | do_proc_douintvec_conv, NULL);
|
| 737 | }
|
| 738 |
|
| 739 | |
| 740 | * Taint values can only be increased
|
| 741 | * This means we can safely use a temporary.
|
| 742 |
|
| 743 | static int proc_taint(const struct ctl_table *table, int write,
|
| 744 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 745 | {
|
| 746 | struct ctl_table t;
|
| 747 | unsigned long tmptaint = get_taint();
|
| 748 | int err;
|
| 749 |
|
| 750 | if (write && !capable(CAP_SYS_ADMIN))
|
| 751 | return -EPERM;
|
| 752 |
|
| 753 | t = *table;
|
| 754 | t.data = &tmptaint;
|
| 755 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
|
| 756 | if (err < 0)
|
| 757 | return err;
|
| 758 |
|
| 759 | if (write) {
|
| 760 | int i;
|
| 761 |
|
| 762 | |
| 763 | * If we are relying on panic_on_taint not producing
|
| 764 | * false positives due to userspace input, bail out
|
| 765 | * before setting the requested taint flags.
|
| 766 |
|
| 767 | if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
|
| 768 | return -EINVAL;
|
| 769 |
|
| 770 | |
| 771 | * Poor man's atomic or. Not worth adding a primitive
|
| 772 | * to everyone's atomic.h for this
|
| 773 |
|
| 774 | for (i = 0; i < TAINT_FLAGS_COUNT; i++)
|
| 775 | if ((1UL << i) & tmptaint)
|
| 776 | add_taint(i, LOCKDEP_STILL_OK);
|
| 777 | }
|
| 778 |
|
| 779 | return err;
|
| 780 | }
|
| 781 |
|
| 782 | |
| 783 | * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
|
| 784 | * @min: pointer to minimum allowable value
|
| 785 | * @max: pointer to maximum allowable value
|
| 786 | *
|
| 787 | * The do_proc_dointvec_minmax_conv_param structure provides the
|
| 788 | * minimum and maximum values for doing range checking for those sysctl
|
| 789 | * parameters that use the proc_dointvec_minmax() handler.
|
| 790 |
|
| 791 | struct do_proc_dointvec_minmax_conv_param {
|
| 792 | int *min;
|
| 793 | int *max;
|
| 794 | };
|
| 795 |
|
| 796 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
|
| 797 | int *valp,
|
| 798 | int write, void *data)
|
| 799 | {
|
| 800 | int tmp, ret;
|
| 801 | struct do_proc_dointvec_minmax_conv_param *param = data;
|
| 802 | |
| 803 | * If writing, first do so via a temporary local int so we can
|
| 804 | * bounds-check it before touching *valp.
|
| 805 |
|
| 806 | int *ip = write ? &tmp : valp;
|
| 807 |
|
| 808 | ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
|
| 809 | if (ret)
|
| 810 | return ret;
|
| 811 |
|
| 812 | if (write) {
|
| 813 | if ((param->min && *param->min > tmp) ||
|
| 814 | (param->max && *param->max < tmp))
|
| 815 | return -EINVAL;
|
| 816 | WRITE_ONCE(*valp, tmp);
|
| 817 | }
|
| 818 |
|
| 819 | return 0;
|
| 820 | }
|
| 821 |
|
| 822 | |
| 823 | * proc_dointvec_minmax - read a vector of integers with min/max values
|
| 824 | * @table: the sysctl table
|
| 825 | * @write: %TRUE if this is a write to the sysctl file
|
| 826 | * @buffer: the user buffer
|
| 827 | * @lenp: the size of the user buffer
|
| 828 | * @ppos: file position
|
| 829 | *
|
| 830 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 831 | * values from/to the user buffer, treated as an ASCII string.
|
| 832 | *
|
| 833 | * This routine will ensure the values are within the range specified by
|
| 834 | * table->extra1 (min) and table->extra2 (max).
|
| 835 | *
|
| 836 | * Returns 0 on success or -EINVAL on write when the range check fails.
|
| 837 |
|
| 838 | int proc_dointvec_minmax(const struct ctl_table *table, int write,
|
| 839 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 840 | {
|
| 841 | struct do_proc_dointvec_minmax_conv_param param = {
|
| 842 | .min = (int *) table->extra1,
|
| 843 | .max = (int *) table->extra2,
|
| 844 | };
|
| 845 | return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
| 846 | do_proc_dointvec_minmax_conv, ¶m);
|
| 847 | }
|
| 848 |
|
| 849 | |
| 850 | * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
|
| 851 | * @min: pointer to minimum allowable value
|
| 852 | * @max: pointer to maximum allowable value
|
| 853 | *
|
| 854 | * The do_proc_douintvec_minmax_conv_param structure provides the
|
| 855 | * minimum and maximum values for doing range checking for those sysctl
|
| 856 | * parameters that use the proc_douintvec_minmax() handler.
|
| 857 |
|
| 858 | struct do_proc_douintvec_minmax_conv_param {
|
| 859 | unsigned int *min;
|
| 860 | unsigned int *max;
|
| 861 | };
|
| 862 |
|
| 863 | static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
|
| 864 | unsigned int *valp,
|
| 865 | int write, void *data)
|
| 866 | {
|
| 867 | int ret;
|
| 868 | unsigned int tmp;
|
| 869 | struct do_proc_douintvec_minmax_conv_param *param = data;
|
| 870 |
|
| 871 | unsigned int *up = write ? &tmp : valp;
|
| 872 |
|
| 873 | ret = do_proc_douintvec_conv(lvalp, up, write, data);
|
| 874 | if (ret)
|
| 875 | return ret;
|
| 876 |
|
| 877 | if (write) {
|
| 878 | if ((param->min && *param->min > tmp) ||
|
| 879 | (param->max && *param->max < tmp))
|
| 880 | return -ERANGE;
|
| 881 |
|
| 882 | WRITE_ONCE(*valp, tmp);
|
| 883 | }
|
| 884 |
|
| 885 | return 0;
|
| 886 | }
|
| 887 |
|
| 888 | |
| 889 | * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
|
| 890 | * @table: the sysctl table
|
| 891 | * @write: %TRUE if this is a write to the sysctl file
|
| 892 | * @buffer: the user buffer
|
| 893 | * @lenp: the size of the user buffer
|
| 894 | * @ppos: file position
|
| 895 | *
|
| 896 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
|
| 897 | * values from/to the user buffer, treated as an ASCII string. Negative
|
| 898 | * strings are not allowed.
|
| 899 | *
|
| 900 | * This routine will ensure the values are within the range specified by
|
| 901 | * table->extra1 (min) and table->extra2 (max). There is a final sanity
|
| 902 | * check for UINT_MAX to avoid having to support wrap around uses from
|
| 903 | * userspace.
|
| 904 | *
|
| 905 | * Returns 0 on success or -ERANGE on write when the range check fails.
|
| 906 |
|
| 907 | int proc_douintvec_minmax(const struct ctl_table *table, int write,
|
| 908 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 909 | {
|
| 910 | struct do_proc_douintvec_minmax_conv_param param = {
|
| 911 | .min = (unsigned int *) table->extra1,
|
| 912 | .max = (unsigned int *) table->extra2,
|
| 913 | };
|
| 914 | return do_proc_douintvec(table, write, buffer, lenp, ppos,
|
| 915 | do_proc_douintvec_minmax_conv, ¶m);
|
| 916 | }
|
| 917 |
|
| 918 | |
| 919 | * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
|
| 920 | * @table: the sysctl table
|
| 921 | * @write: %TRUE if this is a write to the sysctl file
|
| 922 | * @buffer: the user buffer
|
| 923 | * @lenp: the size of the user buffer
|
| 924 | * @ppos: file position
|
| 925 | *
|
| 926 | * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
|
| 927 | * values from/to the user buffer, treated as an ASCII string. Negative
|
| 928 | * strings are not allowed.
|
| 929 | *
|
| 930 | * This routine will ensure the values are within the range specified by
|
| 931 | * table->extra1 (min) and table->extra2 (max).
|
| 932 | *
|
| 933 | * Returns 0 on success or an error on write when the range check fails.
|
| 934 |
|
| 935 | int proc_dou8vec_minmax(const struct ctl_table *table, int write,
|
| 936 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 937 | {
|
| 938 | struct ctl_table tmp;
|
| 939 | unsigned int min = 0, max = 255U, val;
|
| 940 | u8 *data = table->data;
|
| 941 | struct do_proc_douintvec_minmax_conv_param param = {
|
| 942 | .min = &min,
|
| 943 | .max = &max,
|
| 944 | };
|
| 945 | int res;
|
| 946 |
|
| 947 |
|
| 948 | if (table->maxlen != sizeof(u8))
|
| 949 | return -EINVAL;
|
| 950 |
|
| 951 | if (table->extra1)
|
| 952 | min = *(unsigned int *) table->extra1;
|
| 953 | if (table->extra2)
|
| 954 | max = *(unsigned int *) table->extra2;
|
| 955 |
|
| 956 | tmp = *table;
|
| 957 |
|
| 958 | tmp.maxlen = sizeof(val);
|
| 959 | tmp.data = &val;
|
| 960 | val = READ_ONCE(*data);
|
| 961 | res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
|
| 962 | do_proc_douintvec_minmax_conv, ¶m);
|
| 963 | if (res)
|
| 964 | return res;
|
| 965 | if (write)
|
| 966 | WRITE_ONCE(*data, val);
|
| 967 | return 0;
|
| 968 | }
|
| 969 | EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
|
| 970 |
|
| 971 | #ifdef CONFIG_MAGIC_SYSRQ
|
| 972 | static int sysrq_sysctl_handler(const struct ctl_table *table, int write,
|
| 973 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 974 | {
|
| 975 | int tmp, ret;
|
| 976 |
|
| 977 | tmp = sysrq_mask();
|
| 978 |
|
| 979 | ret = __do_proc_dointvec(&tmp, table, write, buffer,
|
| 980 | lenp, ppos, NULL, NULL);
|
| 981 | if (ret || !write)
|
| 982 | return ret;
|
| 983 |
|
| 984 | if (write)
|
| 985 | sysrq_toggle_support(tmp);
|
| 986 |
|
| 987 | return 0;
|
| 988 | }
|
| 989 | #endif
|
| 990 |
|
| 991 | static int __do_proc_doulongvec_minmax(void *data,
|
| 992 | const struct ctl_table *table, int write,
|
| 993 | void *buffer, size_t *lenp, loff_t *ppos,
|
| 994 | unsigned long convmul, unsigned long convdiv)
|
| 995 | {
|
| 996 | unsigned long *i, *min, *max;
|
| 997 | int vleft, first = 1, err = 0;
|
| 998 | size_t left;
|
| 999 | char *p;
|
| 1000 |
|
| 1001 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
| 1002 | *lenp = 0;
|
| 1003 | return 0;
|
| 1004 | }
|
| 1005 |
|
| 1006 | i = data;
|
| 1007 | min = table->extra1;
|
| 1008 | max = table->extra2;
|
| 1009 | vleft = table->maxlen / sizeof(unsigned long);
|
| 1010 | left = *lenp;
|
| 1011 |
|
| 1012 | if (write) {
|
| 1013 | if (proc_first_pos_non_zero_ignore(ppos, table))
|
| 1014 | goto out;
|
| 1015 |
|
| 1016 | if (left > PAGE_SIZE - 1)
|
| 1017 | left = PAGE_SIZE - 1;
|
| 1018 | p = buffer;
|
| 1019 | }
|
| 1020 |
|
| 1021 | for (; left && vleft--; i++, first = 0) {
|
| 1022 | unsigned long val;
|
| 1023 |
|
| 1024 | if (write) {
|
| 1025 | bool neg;
|
| 1026 |
|
| 1027 | proc_skip_spaces(&p, &left);
|
| 1028 | if (!left)
|
| 1029 | break;
|
| 1030 |
|
| 1031 | err = proc_get_long(&p, &left, &val, &neg,
|
| 1032 | proc_wspace_sep,
|
| 1033 | sizeof(proc_wspace_sep), NULL);
|
| 1034 | if (err || neg) {
|
| 1035 | err = -EINVAL;
|
| 1036 | break;
|
| 1037 | }
|
| 1038 |
|
| 1039 | val = convmul * val / convdiv;
|
| 1040 | if ((min && val < *min) || (max && val > *max)) {
|
| 1041 | err = -EINVAL;
|
| 1042 | break;
|
| 1043 | }
|
| 1044 | WRITE_ONCE(*i, val);
|
| 1045 | } else {
|
| 1046 | val = convdiv * READ_ONCE(*i) / convmul;
|
| 1047 | if (!first)
|
| 1048 | proc_put_char(&buffer, &left, '\t');
|
| 1049 | proc_put_long(&buffer, &left, val, false);
|
| 1050 | }
|
| 1051 | }
|
| 1052 |
|
| 1053 | if (!write && !first && left && !err)
|
| 1054 | proc_put_char(&buffer, &left, '\n');
|
| 1055 | if (write && !err)
|
| 1056 | proc_skip_spaces(&p, &left);
|
| 1057 | if (write && first)
|
| 1058 | return err ? : -EINVAL;
|
| 1059 | *lenp -= left;
|
| 1060 | out:
|
| 1061 | *ppos += *lenp;
|
| 1062 | return err;
|
| 1063 | }
|
| 1064 |
|
| 1065 | static int do_proc_doulongvec_minmax(const struct ctl_table *table, int write,
|
| 1066 | void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
|
| 1067 | unsigned long convdiv)
|
| 1068 | {
|
| 1069 | return __do_proc_doulongvec_minmax(table->data, table, write,
|
| 1070 | buffer, lenp, ppos, convmul, convdiv);
|
| 1071 | }
|
| 1072 |
|
| 1073 | |
| 1074 | * proc_doulongvec_minmax - read a vector of long integers with min/max values
|
| 1075 | * @table: the sysctl table
|
| 1076 | * @write: %TRUE if this is a write to the sysctl file
|
| 1077 | * @buffer: the user buffer
|
| 1078 | * @lenp: the size of the user buffer
|
| 1079 | * @ppos: file position
|
| 1080 | *
|
| 1081 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
|
| 1082 | * values from/to the user buffer, treated as an ASCII string.
|
| 1083 | *
|
| 1084 | * This routine will ensure the values are within the range specified by
|
| 1085 | * table->extra1 (min) and table->extra2 (max).
|
| 1086 | *
|
| 1087 | * Returns 0 on success.
|
| 1088 |
|
| 1089 | int proc_doulongvec_minmax(const struct ctl_table *table, int write,
|
| 1090 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1091 | {
|
| 1092 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
|
| 1093 | }
|
| 1094 |
|
| 1095 | |
| 1096 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
|
| 1097 | * @table: the sysctl table
|
| 1098 | * @write: %TRUE if this is a write to the sysctl file
|
| 1099 | * @buffer: the user buffer
|
| 1100 | * @lenp: the size of the user buffer
|
| 1101 | * @ppos: file position
|
| 1102 | *
|
| 1103 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
|
| 1104 | * values from/to the user buffer, treated as an ASCII string. The values
|
| 1105 | * are treated as milliseconds, and converted to jiffies when they are stored.
|
| 1106 | *
|
| 1107 | * This routine will ensure the values are within the range specified by
|
| 1108 | * table->extra1 (min) and table->extra2 (max).
|
| 1109 | *
|
| 1110 | * Returns 0 on success.
|
| 1111 |
|
| 1112 | int proc_doulongvec_ms_jiffies_minmax(const struct ctl_table *table, int write,
|
| 1113 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1114 | {
|
| 1115 | return do_proc_doulongvec_minmax(table, write, buffer,
|
| 1116 | lenp, ppos, HZ, 1000l);
|
| 1117 | }
|
| 1118 |
|
| 1119 |
|
| 1120 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
|
| 1121 | int *valp,
|
| 1122 | int write, void *data)
|
| 1123 | {
|
| 1124 | if (write) {
|
| 1125 | if (*lvalp > INT_MAX / HZ)
|
| 1126 | return 1;
|
| 1127 | if (*negp)
|
| 1128 | WRITE_ONCE(*valp, -*lvalp * HZ);
|
| 1129 | else
|
| 1130 | WRITE_ONCE(*valp, *lvalp * HZ);
|
| 1131 | } else {
|
| 1132 | int val = READ_ONCE(*valp);
|
| 1133 | unsigned long lval;
|
| 1134 | if (val < 0) {
|
| 1135 | *negp = true;
|
| 1136 | lval = -(unsigned long)val;
|
| 1137 | } else {
|
| 1138 | *negp = false;
|
| 1139 | lval = (unsigned long)val;
|
| 1140 | }
|
| 1141 | *lvalp = lval / HZ;
|
| 1142 | }
|
| 1143 | return 0;
|
| 1144 | }
|
| 1145 |
|
| 1146 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
|
| 1147 | int *valp,
|
| 1148 | int write, void *data)
|
| 1149 | {
|
| 1150 | if (write) {
|
| 1151 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
|
| 1152 | return 1;
|
| 1153 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
|
| 1154 | } else {
|
| 1155 | int val = *valp;
|
| 1156 | unsigned long lval;
|
| 1157 | if (val < 0) {
|
| 1158 | *negp = true;
|
| 1159 | lval = -(unsigned long)val;
|
| 1160 | } else {
|
| 1161 | *negp = false;
|
| 1162 | lval = (unsigned long)val;
|
| 1163 | }
|
| 1164 | *lvalp = jiffies_to_clock_t(lval);
|
| 1165 | }
|
| 1166 | return 0;
|
| 1167 | }
|
| 1168 |
|
| 1169 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
|
| 1170 | int *valp,
|
| 1171 | int write, void *data)
|
| 1172 | {
|
| 1173 | if (write) {
|
| 1174 | unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
|
| 1175 |
|
| 1176 | if (jif > INT_MAX)
|
| 1177 | return 1;
|
| 1178 | WRITE_ONCE(*valp, (int)jif);
|
| 1179 | } else {
|
| 1180 | int val = READ_ONCE(*valp);
|
| 1181 | unsigned long lval;
|
| 1182 | if (val < 0) {
|
| 1183 | *negp = true;
|
| 1184 | lval = -(unsigned long)val;
|
| 1185 | } else {
|
| 1186 | *negp = false;
|
| 1187 | lval = (unsigned long)val;
|
| 1188 | }
|
| 1189 | *lvalp = jiffies_to_msecs(lval);
|
| 1190 | }
|
| 1191 | return 0;
|
| 1192 | }
|
| 1193 |
|
| 1194 | static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp,
|
| 1195 | int *valp, int write, void *data)
|
| 1196 | {
|
| 1197 | int tmp, ret;
|
| 1198 | struct do_proc_dointvec_minmax_conv_param *param = data;
|
| 1199 | |
| 1200 | * If writing, first do so via a temporary local int so we can
|
| 1201 | * bounds-check it before touching *valp.
|
| 1202 |
|
| 1203 | int *ip = write ? &tmp : valp;
|
| 1204 |
|
| 1205 | ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data);
|
| 1206 | if (ret)
|
| 1207 | return ret;
|
| 1208 |
|
| 1209 | if (write) {
|
| 1210 | if ((param->min && *param->min > tmp) ||
|
| 1211 | (param->max && *param->max < tmp))
|
| 1212 | return -EINVAL;
|
| 1213 | *valp = tmp;
|
| 1214 | }
|
| 1215 | return 0;
|
| 1216 | }
|
| 1217 |
|
| 1218 | |
| 1219 | * proc_dointvec_jiffies - read a vector of integers as seconds
|
| 1220 | * @table: the sysctl table
|
| 1221 | * @write: %TRUE if this is a write to the sysctl file
|
| 1222 | * @buffer: the user buffer
|
| 1223 | * @lenp: the size of the user buffer
|
| 1224 | * @ppos: file position
|
| 1225 | *
|
| 1226 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 1227 | * values from/to the user buffer, treated as an ASCII string.
|
| 1228 | * The values read are assumed to be in seconds, and are converted into
|
| 1229 | * jiffies.
|
| 1230 | *
|
| 1231 | * Returns 0 on success.
|
| 1232 |
|
| 1233 | int proc_dointvec_jiffies(const struct ctl_table *table, int write,
|
| 1234 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1235 | {
|
| 1236 | return do_proc_dointvec(table,write,buffer,lenp,ppos,
|
| 1237 | do_proc_dointvec_jiffies_conv,NULL);
|
| 1238 | }
|
| 1239 |
|
| 1240 | int proc_dointvec_ms_jiffies_minmax(const struct ctl_table *table, int write,
|
| 1241 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1242 | {
|
| 1243 | struct do_proc_dointvec_minmax_conv_param param = {
|
| 1244 | .min = (int *) table->extra1,
|
| 1245 | .max = (int *) table->extra2,
|
| 1246 | };
|
| 1247 | return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
| 1248 | do_proc_dointvec_ms_jiffies_minmax_conv, ¶m);
|
| 1249 | }
|
| 1250 |
|
| 1251 | |
| 1252 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
|
| 1253 | * @table: the sysctl table
|
| 1254 | * @write: %TRUE if this is a write to the sysctl file
|
| 1255 | * @buffer: the user buffer
|
| 1256 | * @lenp: the size of the user buffer
|
| 1257 | * @ppos: pointer to the file position
|
| 1258 | *
|
| 1259 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 1260 | * values from/to the user buffer, treated as an ASCII string.
|
| 1261 | * The values read are assumed to be in 1/USER_HZ seconds, and
|
| 1262 | * are converted into jiffies.
|
| 1263 | *
|
| 1264 | * Returns 0 on success.
|
| 1265 |
|
| 1266 | int proc_dointvec_userhz_jiffies(const struct ctl_table *table, int write,
|
| 1267 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1268 | {
|
| 1269 | return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
| 1270 | do_proc_dointvec_userhz_jiffies_conv, NULL);
|
| 1271 | }
|
| 1272 |
|
| 1273 | |
| 1274 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
|
| 1275 | * @table: the sysctl table
|
| 1276 | * @write: %TRUE if this is a write to the sysctl file
|
| 1277 | * @buffer: the user buffer
|
| 1278 | * @lenp: the size of the user buffer
|
| 1279 | * @ppos: the current position in the file
|
| 1280 | *
|
| 1281 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
| 1282 | * values from/to the user buffer, treated as an ASCII string.
|
| 1283 | * The values read are assumed to be in 1/1000 seconds, and
|
| 1284 | * are converted into jiffies.
|
| 1285 | *
|
| 1286 | * Returns 0 on success.
|
| 1287 |
|
| 1288 | int proc_dointvec_ms_jiffies(const struct ctl_table *table, int write, void *buffer,
|
| 1289 | size_t *lenp, loff_t *ppos)
|
| 1290 | {
|
| 1291 | return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
| 1292 | do_proc_dointvec_ms_jiffies_conv, NULL);
|
| 1293 | }
|
| 1294 |
|
| 1295 | static int proc_do_cad_pid(const struct ctl_table *table, int write, void *buffer,
|
| 1296 | size_t *lenp, loff_t *ppos)
|
| 1297 | {
|
| 1298 | struct pid *new_pid;
|
| 1299 | pid_t tmp;
|
| 1300 | int r;
|
| 1301 |
|
| 1302 | tmp = pid_vnr(cad_pid);
|
| 1303 |
|
| 1304 | r = __do_proc_dointvec(&tmp, table, write, buffer,
|
| 1305 | lenp, ppos, NULL, NULL);
|
| 1306 | if (r || !write)
|
| 1307 | return r;
|
| 1308 |
|
| 1309 | new_pid = find_get_pid(tmp);
|
| 1310 | if (!new_pid)
|
| 1311 | return -ESRCH;
|
| 1312 |
|
| 1313 | put_pid(xchg(&cad_pid, new_pid));
|
| 1314 | return 0;
|
| 1315 | }
|
| 1316 |
|
| 1317 | |
| 1318 | * proc_do_large_bitmap - read/write from/to a large bitmap
|
| 1319 | * @table: the sysctl table
|
| 1320 | * @write: %TRUE if this is a write to the sysctl file
|
| 1321 | * @buffer: the user buffer
|
| 1322 | * @lenp: the size of the user buffer
|
| 1323 | * @ppos: file position
|
| 1324 | *
|
| 1325 | * The bitmap is stored at table->data and the bitmap length (in bits)
|
| 1326 | * in table->maxlen.
|
| 1327 | *
|
| 1328 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that
|
| 1329 | * large bitmaps may be represented in a compact manner. Writing into
|
| 1330 | * the file will clear the bitmap then update it with the given input.
|
| 1331 | *
|
| 1332 | * Returns 0 on success.
|
| 1333 |
|
| 1334 | int proc_do_large_bitmap(const struct ctl_table *table, int write,
|
| 1335 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1336 | {
|
| 1337 | int err = 0;
|
| 1338 | size_t left = *lenp;
|
| 1339 | unsigned long bitmap_len = table->maxlen;
|
| 1340 | unsigned long *bitmap = *(unsigned long **) table->data;
|
| 1341 | unsigned long *tmp_bitmap = NULL;
|
| 1342 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
|
| 1343 |
|
| 1344 | if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
|
| 1345 | *lenp = 0;
|
| 1346 | return 0;
|
| 1347 | }
|
| 1348 |
|
| 1349 | if (write) {
|
| 1350 | char *p = buffer;
|
| 1351 | size_t skipped = 0;
|
| 1352 |
|
| 1353 | if (left > PAGE_SIZE - 1) {
|
| 1354 | left = PAGE_SIZE - 1;
|
| 1355 |
|
| 1356 | skipped = *lenp - left;
|
| 1357 | }
|
| 1358 |
|
| 1359 | tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
|
| 1360 | if (!tmp_bitmap)
|
| 1361 | return -ENOMEM;
|
| 1362 | proc_skip_char(&p, &left, '\n');
|
| 1363 | while (!err && left) {
|
| 1364 | unsigned long val_a, val_b;
|
| 1365 | bool neg;
|
| 1366 | size_t saved_left;
|
| 1367 |
|
| 1368 |
|
| 1369 | saved_left = left;
|
| 1370 | err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
|
| 1371 | sizeof(tr_a), &c);
|
| 1372 | |
| 1373 | * If we consumed the entirety of a truncated buffer or
|
| 1374 | * only one char is left (may be a "-"), then stop here,
|
| 1375 | * reset, & come back for more.
|
| 1376 |
|
| 1377 | if ((left <= 1) && skipped) {
|
| 1378 | left = saved_left;
|
| 1379 | break;
|
| 1380 | }
|
| 1381 |
|
| 1382 | if (err)
|
| 1383 | break;
|
| 1384 | if (val_a >= bitmap_len || neg) {
|
| 1385 | err = -EINVAL;
|
| 1386 | break;
|
| 1387 | }
|
| 1388 |
|
| 1389 | val_b = val_a;
|
| 1390 | if (left) {
|
| 1391 | p++;
|
| 1392 | left--;
|
| 1393 | }
|
| 1394 |
|
| 1395 | if (c == '-') {
|
| 1396 | err = proc_get_long(&p, &left, &val_b,
|
| 1397 | &neg, tr_b, sizeof(tr_b),
|
| 1398 | &c);
|
| 1399 | |
| 1400 | * If we consumed all of a truncated buffer or
|
| 1401 | * then stop here, reset, & come back for more.
|
| 1402 |
|
| 1403 | if (!left && skipped) {
|
| 1404 | left = saved_left;
|
| 1405 | break;
|
| 1406 | }
|
| 1407 |
|
| 1408 | if (err)
|
| 1409 | break;
|
| 1410 | if (val_b >= bitmap_len || neg ||
|
| 1411 | val_a > val_b) {
|
| 1412 | err = -EINVAL;
|
| 1413 | break;
|
| 1414 | }
|
| 1415 | if (left) {
|
| 1416 | p++;
|
| 1417 | left--;
|
| 1418 | }
|
| 1419 | }
|
| 1420 |
|
| 1421 | bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
|
| 1422 | proc_skip_char(&p, &left, '\n');
|
| 1423 | }
|
| 1424 | left += skipped;
|
| 1425 | } else {
|
| 1426 | unsigned long bit_a, bit_b = 0;
|
| 1427 | bool first = 1;
|
| 1428 |
|
| 1429 | while (left) {
|
| 1430 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
|
| 1431 | if (bit_a >= bitmap_len)
|
| 1432 | break;
|
| 1433 | bit_b = find_next_zero_bit(bitmap, bitmap_len,
|
| 1434 | bit_a + 1) - 1;
|
| 1435 |
|
| 1436 | if (!first)
|
| 1437 | proc_put_char(&buffer, &left, ',');
|
| 1438 | proc_put_long(&buffer, &left, bit_a, false);
|
| 1439 | if (bit_a != bit_b) {
|
| 1440 | proc_put_char(&buffer, &left, '-');
|
| 1441 | proc_put_long(&buffer, &left, bit_b, false);
|
| 1442 | }
|
| 1443 |
|
| 1444 | first = 0; bit_b++;
|
| 1445 | }
|
| 1446 | proc_put_char(&buffer, &left, '\n');
|
| 1447 | }
|
| 1448 |
|
| 1449 | if (!err) {
|
| 1450 | if (write) {
|
| 1451 | if (*ppos)
|
| 1452 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
|
| 1453 | else
|
| 1454 | bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
|
| 1455 | }
|
| 1456 | *lenp -= left;
|
| 1457 | *ppos += *lenp;
|
| 1458 | }
|
| 1459 |
|
| 1460 | bitmap_free(tmp_bitmap);
|
| 1461 | return err;
|
| 1462 | }
|
| 1463 |
|
| 1464 | #else
|
| 1465 |
|
| 1466 | int proc_dostring(const struct ctl_table *table, int write,
|
| 1467 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1468 | {
|
| 1469 | return -ENOSYS;
|
| 1470 | }
|
| 1471 |
|
| 1472 | int proc_dobool(const struct ctl_table *table, int write,
|
| 1473 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1474 | {
|
| 1475 | return -ENOSYS;
|
| 1476 | }
|
| 1477 |
|
| 1478 | int proc_dointvec(const struct ctl_table *table, int write,
|
| 1479 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1480 | {
|
| 1481 | return -ENOSYS;
|
| 1482 | }
|
| 1483 |
|
| 1484 | int proc_douintvec(const struct ctl_table *table, int write,
|
| 1485 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1486 | {
|
| 1487 | return -ENOSYS;
|
| 1488 | }
|
| 1489 |
|
| 1490 | int proc_dointvec_minmax(const struct ctl_table *table, int write,
|
| 1491 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1492 | {
|
| 1493 | return -ENOSYS;
|
| 1494 | }
|
| 1495 |
|
| 1496 | int proc_douintvec_minmax(const struct ctl_table *table, int write,
|
| 1497 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1498 | {
|
| 1499 | return -ENOSYS;
|
| 1500 | }
|
| 1501 |
|
| 1502 | int proc_dou8vec_minmax(const struct ctl_table *table, int write,
|
| 1503 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1504 | {
|
| 1505 | return -ENOSYS;
|
| 1506 | }
|
| 1507 |
|
| 1508 | int proc_dointvec_jiffies(const struct ctl_table *table, int write,
|
| 1509 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1510 | {
|
| 1511 | return -ENOSYS;
|
| 1512 | }
|
| 1513 |
|
| 1514 | int proc_dointvec_ms_jiffies_minmax(const struct ctl_table *table, int write,
|
| 1515 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1516 | {
|
| 1517 | return -ENOSYS;
|
| 1518 | }
|
| 1519 |
|
| 1520 | int proc_dointvec_userhz_jiffies(const struct ctl_table *table, int write,
|
| 1521 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1522 | {
|
| 1523 | return -ENOSYS;
|
| 1524 | }
|
| 1525 |
|
| 1526 | int proc_dointvec_ms_jiffies(const struct ctl_table *table, int write,
|
| 1527 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1528 | {
|
| 1529 | return -ENOSYS;
|
| 1530 | }
|
| 1531 |
|
| 1532 | int proc_doulongvec_minmax(const struct ctl_table *table, int write,
|
| 1533 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1534 | {
|
| 1535 | return -ENOSYS;
|
| 1536 | }
|
| 1537 |
|
| 1538 | int proc_doulongvec_ms_jiffies_minmax(const struct ctl_table *table, int write,
|
| 1539 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1540 | {
|
| 1541 | return -ENOSYS;
|
| 1542 | }
|
| 1543 |
|
| 1544 | int proc_do_large_bitmap(const struct ctl_table *table, int write,
|
| 1545 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1546 | {
|
| 1547 | return -ENOSYS;
|
| 1548 | }
|
| 1549 |
|
| 1550 | #endif
|
| 1551 |
|
| 1552 | #if defined(CONFIG_SYSCTL)
|
| 1553 | int proc_do_static_key(const struct ctl_table *table, int write,
|
| 1554 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 1555 | {
|
| 1556 | struct static_key *key = (struct static_key *)table->data;
|
| 1557 | static DEFINE_MUTEX(static_key_mutex);
|
| 1558 | int val, ret;
|
| 1559 | struct ctl_table tmp = {
|
| 1560 | .data = &val,
|
| 1561 | .maxlen = sizeof(val),
|
| 1562 | .mode = table->mode,
|
| 1563 | .extra1 = SYSCTL_ZERO,
|
| 1564 | .extra2 = SYSCTL_ONE,
|
| 1565 | };
|
| 1566 |
|
| 1567 | if (write && !capable(CAP_SYS_ADMIN))
|
| 1568 | return -EPERM;
|
| 1569 |
|
| 1570 | mutex_lock(&static_key_mutex);
|
| 1571 | val = static_key_enabled(key);
|
| 1572 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
|
| 1573 | if (write && !ret) {
|
| 1574 | if (val)
|
| 1575 | static_key_enable(key);
|
| 1576 | else
|
| 1577 | static_key_disable(key);
|
| 1578 | }
|
| 1579 | mutex_unlock(&static_key_mutex);
|
| 1580 | return ret;
|
| 1581 | }
|
| 1582 |
|
| 1583 | static const struct ctl_table kern_table[] = {
|
| 1584 | #ifdef CONFIG_PROC_SYSCTL
|
| 1585 | {
|
| 1586 | .procname = "tainted",
|
| 1587 | .maxlen = sizeof(long),
|
| 1588 | .mode = 0644,
|
| 1589 | .proc_handler = proc_taint,
|
| 1590 | },
|
| 1591 | {
|
| 1592 | .procname = "sysctl_writes_strict",
|
| 1593 | .data = &sysctl_writes_strict,
|
| 1594 | .maxlen = sizeof(int),
|
| 1595 | .mode = 0644,
|
| 1596 | .proc_handler = proc_dointvec_minmax,
|
| 1597 | .extra1 = SYSCTL_NEG_ONE,
|
| 1598 | .extra2 = SYSCTL_ONE,
|
| 1599 | },
|
| 1600 | #endif
|
| 1601 | #ifdef CONFIG_PARISC
|
| 1602 | {
|
| 1603 | .procname = "soft-power",
|
| 1604 | .data = &pwrsw_enabled,
|
| 1605 | .maxlen = sizeof (int),
|
| 1606 | .mode = 0644,
|
| 1607 | .proc_handler = proc_dointvec,
|
| 1608 | },
|
| 1609 | #endif
|
| 1610 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
|
| 1611 | {
|
| 1612 | .procname = "unaligned-trap",
|
| 1613 | .data = &unaligned_enabled,
|
| 1614 | .maxlen = sizeof (int),
|
| 1615 | .mode = 0644,
|
| 1616 | .proc_handler = proc_dointvec,
|
| 1617 | },
|
| 1618 | #endif
|
| 1619 | #ifdef CONFIG_MODULES
|
| 1620 | {
|
| 1621 | .procname = "modprobe",
|
| 1622 | .data = &modprobe_path,
|
| 1623 | .maxlen = KMOD_PATH_LEN,
|
| 1624 | .mode = 0644,
|
| 1625 | .proc_handler = proc_dostring,
|
| 1626 | },
|
| 1627 | {
|
| 1628 | .procname = "modules_disabled",
|
| 1629 | .data = &modules_disabled,
|
| 1630 | .maxlen = sizeof(int),
|
| 1631 | .mode = 0644,
|
| 1632 |
|
| 1633 | .proc_handler = proc_dointvec_minmax,
|
| 1634 | .extra1 = SYSCTL_ONE,
|
| 1635 | .extra2 = SYSCTL_ONE,
|
| 1636 | },
|
| 1637 | #endif
|
| 1638 | #ifdef CONFIG_UEVENT_HELPER
|
| 1639 | {
|
| 1640 | .procname = "hotplug",
|
| 1641 | .data = &uevent_helper,
|
| 1642 | .maxlen = UEVENT_HELPER_PATH_LEN,
|
| 1643 | .mode = 0644,
|
| 1644 | .proc_handler = proc_dostring,
|
| 1645 | },
|
| 1646 | #endif
|
| 1647 | #ifdef CONFIG_MAGIC_SYSRQ
|
| 1648 | {
|
| 1649 | .procname = "sysrq",
|
| 1650 | .data = NULL,
|
| 1651 | .maxlen = sizeof (int),
|
| 1652 | .mode = 0644,
|
| 1653 | .proc_handler = sysrq_sysctl_handler,
|
| 1654 | },
|
| 1655 | #endif
|
| 1656 | #ifdef CONFIG_PROC_SYSCTL
|
| 1657 | {
|
| 1658 | .procname = "cad_pid",
|
| 1659 | .data = NULL,
|
| 1660 | .maxlen = sizeof (int),
|
| 1661 | .mode = 0600,
|
| 1662 | .proc_handler = proc_do_cad_pid,
|
| 1663 | },
|
| 1664 | #endif
|
| 1665 | {
|
| 1666 | .procname = "threads-max",
|
| 1667 | .data = NULL,
|
| 1668 | .maxlen = sizeof(int),
|
| 1669 | .mode = 0644,
|
| 1670 | .proc_handler = sysctl_max_threads,
|
| 1671 | },
|
| 1672 | {
|
| 1673 | .procname = "overflowuid",
|
| 1674 | .data = &overflowuid,
|
| 1675 | .maxlen = sizeof(int),
|
| 1676 | .mode = 0644,
|
| 1677 | .proc_handler = proc_dointvec_minmax,
|
| 1678 | .extra1 = SYSCTL_ZERO,
|
| 1679 | .extra2 = SYSCTL_MAXOLDUID,
|
| 1680 | },
|
| 1681 | {
|
| 1682 | .procname = "overflowgid",
|
| 1683 | .data = &overflowgid,
|
| 1684 | .maxlen = sizeof(int),
|
| 1685 | .mode = 0644,
|
| 1686 | .proc_handler = proc_dointvec_minmax,
|
| 1687 | .extra1 = SYSCTL_ZERO,
|
| 1688 | .extra2 = SYSCTL_MAXOLDUID,
|
| 1689 | },
|
| 1690 | {
|
| 1691 | .procname = "ngroups_max",
|
| 1692 | .data = (void *)&ngroups_max,
|
| 1693 | .maxlen = sizeof (int),
|
| 1694 | .mode = 0444,
|
| 1695 | .proc_handler = proc_dointvec,
|
| 1696 | },
|
| 1697 | {
|
| 1698 | .procname = "cap_last_cap",
|
| 1699 | .data = (void *)&cap_last_cap,
|
| 1700 | .maxlen = sizeof(int),
|
| 1701 | .mode = 0444,
|
| 1702 | .proc_handler = proc_dointvec,
|
| 1703 | },
|
| 1704 | #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
|
| 1705 | defined(CONFIG_DEBUG_STACKOVERFLOW)
|
| 1706 | {
|
| 1707 | .procname = "panic_on_stackoverflow",
|
| 1708 | .data = &sysctl_panic_on_stackoverflow,
|
| 1709 | .maxlen = sizeof(int),
|
| 1710 | .mode = 0644,
|
| 1711 | .proc_handler = proc_dointvec,
|
| 1712 | },
|
| 1713 | #endif
|
| 1714 | #if defined(CONFIG_MMU)
|
| 1715 | {
|
| 1716 | .procname = "randomize_va_space",
|
| 1717 | .data = &randomize_va_space,
|
| 1718 | .maxlen = sizeof(int),
|
| 1719 | .mode = 0644,
|
| 1720 | .proc_handler = proc_dointvec,
|
| 1721 | },
|
| 1722 | #endif
|
| 1723 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
|
| 1724 | {
|
| 1725 | .procname = "ignore-unaligned-usertrap",
|
| 1726 | .data = &no_unaligned_warning,
|
| 1727 | .maxlen = sizeof (int),
|
| 1728 | .mode = 0644,
|
| 1729 | .proc_handler = proc_dointvec,
|
| 1730 | },
|
| 1731 | #endif
|
| 1732 | #ifdef CONFIG_RT_MUTEXES
|
| 1733 | {
|
| 1734 | .procname = "max_lock_depth",
|
| 1735 | .data = &max_lock_depth,
|
| 1736 | .maxlen = sizeof(int),
|
| 1737 | .mode = 0644,
|
| 1738 | .proc_handler = proc_dointvec,
|
| 1739 | },
|
| 1740 | #endif
|
| 1741 | #ifdef CONFIG_TREE_RCU
|
| 1742 | {
|
| 1743 | .procname = "panic_on_rcu_stall",
|
| 1744 | .data = &sysctl_panic_on_rcu_stall,
|
| 1745 | .maxlen = sizeof(sysctl_panic_on_rcu_stall),
|
| 1746 | .mode = 0644,
|
| 1747 | .proc_handler = proc_dointvec_minmax,
|
| 1748 | .extra1 = SYSCTL_ZERO,
|
| 1749 | .extra2 = SYSCTL_ONE,
|
| 1750 | },
|
| 1751 | {
|
| 1752 | .procname = "max_rcu_stall_to_panic",
|
| 1753 | .data = &sysctl_max_rcu_stall_to_panic,
|
| 1754 | .maxlen = sizeof(sysctl_max_rcu_stall_to_panic),
|
| 1755 | .mode = 0644,
|
| 1756 | .proc_handler = proc_dointvec_minmax,
|
| 1757 | .extra1 = SYSCTL_ONE,
|
| 1758 | .extra2 = SYSCTL_INT_MAX,
|
| 1759 | },
|
| 1760 | #endif
|
| 1761 | };
|
| 1762 |
|
| 1763 | int __init sysctl_init_bases(void)
|
| 1764 | {
|
| 1765 | register_sysctl_init("kernel", kern_table);
|
| 1766 |
|
| 1767 | return 0;
|
| 1768 | }
|
| 1769 | #endif
|
| 1770 | |
| 1771 | * No sense putting this after each symbol definition, twice,
|
| 1772 | * exception granted :-)
|
| 1773 |
|
| 1774 | EXPORT_SYMBOL(proc_dobool);
|
| 1775 | EXPORT_SYMBOL(proc_dointvec);
|
| 1776 | EXPORT_SYMBOL(proc_douintvec);
|
| 1777 | EXPORT_SYMBOL(proc_dointvec_jiffies);
|
| 1778 | EXPORT_SYMBOL(proc_dointvec_minmax);
|
| 1779 | EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
|
| 1780 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
|
| 1781 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
|
| 1782 | EXPORT_SYMBOL(proc_dostring);
|
| 1783 | EXPORT_SYMBOL(proc_doulongvec_minmax);
|
| 1784 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
|
| 1785 | EXPORT_SYMBOL(proc_do_large_bitmap);
|