1 // SPDX-License-Identifier: GPL-2.0-only 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/aio.h> 24 #include <linux/mm.h> 25 #include <linux/swap.h> 26 #include <linux/slab.h> 27 #include <linux/sysctl.h> 28 #include <linux/bitmap.h> 29 #include <linux/signal.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/fs.h> 36 #include <linux/init.h> 37 #include <linux/kernel.h> 38 #include <linux/kobject.h> 39 #include <linux/net.h> 40 #include <linux/sysrq.h> 41 #include <linux/highuid.h> 42 #include <linux/writeback.h> 43 #include <linux/ratelimit.h> 44 #include <linux/compaction.h> 45 #include <linux/hugetlb.h> 46 #include <linux/initrd.h> 47 #include <linux/key.h> 48 #include <linux/times.h> 49 #include <linux/limits.h> 50 #include <linux/dcache.h> 51 #include <linux/dnotify.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/kprobes.h> 60 #include <linux/pipe_fs_i.h> 61 #include <linux/oom.h> 62 #include <linux/kmod.h> 63 #include <linux/capability.h> 64 #include <linux/binfmts.h> 65 #include <linux/sched/sysctl.h> 66 #include <linux/sched/coredump.h> 67 #include <linux/kexec.h> 68 #include <linux/bpf.h> 69 #include <linux/mount.h> 70 #include <linux/userfaultfd_k.h> 71 #include <linux/coredump.h> 72 #include <linux/latencytop.h> 73 #include <linux/pid.h> 74 75 #include "../lib/kstrtox.h" 76 77 #include <linux/uaccess.h> 78 #include <asm/processor.h> 79 80 #ifdef CONFIG_X86 81 #include <asm/nmi.h> 82 #include <asm/stacktrace.h> 83 #include <asm/io.h> 84 #endif 85 #ifdef CONFIG_SPARC 86 #include <asm/setup.h> 87 #endif 88 #ifdef CONFIG_BSD_PROCESS_ACCT 89 #include <linux/acct.h> 90 #endif 91 #ifdef CONFIG_RT_MUTEXES 92 #include <linux/rtmutex.h> 93 #endif 94 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 95 #include <linux/lockdep.h> 96 #endif 97 #ifdef CONFIG_CHR_DEV_SG 98 #include <scsi/sg.h> 99 #endif 100 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE 101 #include <linux/stackleak.h> 102 #endif 103 #ifdef CONFIG_LOCKUP_DETECTOR 104 #include <linux/nmi.h> 105 #endif 106 107 #if defined(CONFIG_SYSCTL) 108 109 /* Constants used for minimum and maximum */ 110 #ifdef CONFIG_LOCKUP_DETECTOR 111 static int sixty = 60; 112 #endif 113 114 static int __maybe_unused neg_one = -1; 115 static int __maybe_unused two = 2; 116 static int __maybe_unused four = 4; 117 static unsigned long zero_ul; 118 static unsigned long one_ul = 1; 119 static unsigned long long_max = LONG_MAX; 120 static int one_hundred = 100; 121 static int two_hundred = 200; 122 static int one_thousand = 1000; 123 #ifdef CONFIG_PRINTK 124 static int ten_thousand = 10000; 125 #endif 126 #ifdef CONFIG_PERF_EVENTS 127 static int six_hundred_forty_kb = 640 * 1024; 128 #endif 129 130 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 131 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 132 133 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 134 static int maxolduid = 65535; 135 static int minolduid; 136 137 static int ngroups_max = NGROUPS_MAX; 138 static const int cap_last_cap = CAP_LAST_CAP; 139 140 /* 141 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs 142 * and hung_task_check_interval_secs 143 */ 144 #ifdef CONFIG_DETECT_HUNG_TASK 145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 146 #endif 147 148 #ifdef CONFIG_INOTIFY_USER 149 #include <linux/inotify.h> 150 #endif 151 152 #ifdef CONFIG_PROC_SYSCTL 153 154 /** 155 * enum sysctl_writes_mode - supported sysctl write modes 156 * 157 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value 158 * to be written, and multiple writes on the same sysctl file descriptor 159 * will rewrite the sysctl value, regardless of file position. No warning 160 * is issued when the initial position is not 0. 161 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is 162 * not 0. 163 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at 164 * file position 0 and the value must be fully contained in the buffer 165 * sent to the write syscall. If dealing with strings respect the file 166 * position, but restrict this to the max length of the buffer, anything 167 * passed the max length will be ignored. Multiple writes will append 168 * to the buffer. 169 * 170 * These write modes control how current file position affects the behavior of 171 * updating sysctl values through the proc interface on each write. 172 */ 173 enum sysctl_writes_mode { 174 SYSCTL_WRITES_LEGACY = -1, 175 SYSCTL_WRITES_WARN = 0, 176 SYSCTL_WRITES_STRICT = 1, 177 }; 178 179 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; 180 #endif /* CONFIG_PROC_SYSCTL */ 181 182 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ 183 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) 184 int sysctl_legacy_va_layout; 185 #endif 186 187 #ifdef CONFIG_SCHED_DEBUG 188 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 189 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 190 static int min_wakeup_granularity_ns; /* 0 usecs */ 191 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 192 #ifdef CONFIG_SMP 193 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 194 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 195 #endif /* CONFIG_SMP */ 196 #endif /* CONFIG_SCHED_DEBUG */ 197 198 #ifdef CONFIG_COMPACTION 199 static int min_extfrag_threshold; 200 static int max_extfrag_threshold = 1000; 201 #endif 202 203 #endif /* CONFIG_SYSCTL */ 204 205 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL) 206 static int bpf_stats_handler(struct ctl_table *table, int write, 207 void __user *buffer, size_t *lenp, 208 loff_t *ppos) 209 { 210 struct static_key *key = (struct static_key *)table->data; 211 static int saved_val; 212 int val, ret; 213 struct ctl_table tmp = { 214 .data = &val, 215 .maxlen = sizeof(val), 216 .mode = table->mode, 217 .extra1 = SYSCTL_ZERO, 218 .extra2 = SYSCTL_ONE, 219 }; 220 221 if (write && !capable(CAP_SYS_ADMIN)) 222 return -EPERM; 223 224 mutex_lock(&bpf_stats_enabled_mutex); 225 val = saved_val; 226 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 227 if (write && !ret && val != saved_val) { 228 if (val) 229 static_key_slow_inc(key); 230 else 231 static_key_slow_dec(key); 232 saved_val = val; 233 } 234 mutex_unlock(&bpf_stats_enabled_mutex); 235 return ret; 236 } 237 #endif 238 239 /* 240 * /proc/sys support 241 */ 242 243 #ifdef CONFIG_PROC_SYSCTL 244 245 static int _proc_do_string(char *data, int maxlen, int write, 246 char *buffer, size_t *lenp, loff_t *ppos) 247 { 248 size_t len; 249 char c, *p; 250 251 if (!data || !maxlen || !*lenp) { 252 *lenp = 0; 253 return 0; 254 } 255 256 if (write) { 257 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 258 /* Only continue writes not past the end of buffer. */ 259 len = strlen(data); 260 if (len > maxlen - 1) 261 len = maxlen - 1; 262 263 if (*ppos > len) 264 return 0; 265 len = *ppos; 266 } else { 267 /* Start writing from beginning of buffer. */ 268 len = 0; 269 } 270 271 *ppos += *lenp; 272 p = buffer; 273 while ((p - buffer) < *lenp && len < maxlen - 1) { 274 c = *(p++); 275 if (c == 0 || c == '\n') 276 break; 277 data[len++] = c; 278 } 279 data[len] = 0; 280 } else { 281 len = strlen(data); 282 if (len > maxlen) 283 len = maxlen; 284 285 if (*ppos > len) { 286 *lenp = 0; 287 return 0; 288 } 289 290 data += *ppos; 291 len -= *ppos; 292 293 if (len > *lenp) 294 len = *lenp; 295 if (len) 296 memcpy(buffer, data, len); 297 if (len < *lenp) { 298 buffer[len] = '\n'; 299 len++; 300 } 301 *lenp = len; 302 *ppos += len; 303 } 304 return 0; 305 } 306 307 static void warn_sysctl_write(struct ctl_table *table) 308 { 309 pr_warn_once("%s wrote to %s when file position was not 0!\n" 310 "This will not be supported in the future. To silence this\n" 311 "warning, set kernel.sysctl_writes_strict = -1\n", 312 current->comm, table->procname); 313 } 314 315 /** 316 * proc_first_pos_non_zero_ignore - check if first position is allowed 317 * @ppos: file position 318 * @table: the sysctl table 319 * 320 * Returns true if the first position is non-zero and the sysctl_writes_strict 321 * mode indicates this is not allowed for numeric input types. String proc 322 * handlers can ignore the return value. 323 */ 324 static bool proc_first_pos_non_zero_ignore(loff_t *ppos, 325 struct ctl_table *table) 326 { 327 if (!*ppos) 328 return false; 329 330 switch (sysctl_writes_strict) { 331 case SYSCTL_WRITES_STRICT: 332 return true; 333 case SYSCTL_WRITES_WARN: 334 warn_sysctl_write(table); 335 return false; 336 default: 337 return false; 338 } 339 } 340 341 /** 342 * proc_dostring - read a string sysctl 343 * @table: the sysctl table 344 * @write: %TRUE if this is a write to the sysctl file 345 * @buffer: the user buffer 346 * @lenp: the size of the user buffer 347 * @ppos: file position 348 * 349 * Reads/writes a string from/to the user buffer. If the kernel 350 * buffer provided is not large enough to hold the string, the 351 * string is truncated. The copied string is %NULL-terminated. 352 * If the string is being read by the user process, it is copied 353 * and a newline '\n' is added. It is truncated if the buffer is 354 * not large enough. 355 * 356 * Returns 0 on success. 357 */ 358 int proc_dostring(struct ctl_table *table, int write, 359 void *buffer, size_t *lenp, loff_t *ppos) 360 { 361 if (write) 362 proc_first_pos_non_zero_ignore(ppos, table); 363 364 return _proc_do_string(table->data, table->maxlen, write, buffer, lenp, 365 ppos); 366 } 367 368 static size_t proc_skip_spaces(char **buf) 369 { 370 size_t ret; 371 char *tmp = skip_spaces(*buf); 372 ret = tmp - *buf; 373 *buf = tmp; 374 return ret; 375 } 376 377 static void proc_skip_char(char **buf, size_t *size, const char v) 378 { 379 while (*size) { 380 if (**buf != v) 381 break; 382 (*size)--; 383 (*buf)++; 384 } 385 } 386 387 /** 388 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only 389 * fail on overflow 390 * 391 * @cp: kernel buffer containing the string to parse 392 * @endp: pointer to store the trailing characters 393 * @base: the base to use 394 * @res: where the parsed integer will be stored 395 * 396 * In case of success 0 is returned and @res will contain the parsed integer, 397 * @endp will hold any trailing characters. 398 * This function will fail the parse on overflow. If there wasn't an overflow 399 * the function will defer the decision what characters count as invalid to the 400 * caller. 401 */ 402 static int strtoul_lenient(const char *cp, char **endp, unsigned int base, 403 unsigned long *res) 404 { 405 unsigned long long result; 406 unsigned int rv; 407 408 cp = _parse_integer_fixup_radix(cp, &base); 409 rv = _parse_integer(cp, base, &result); 410 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result)) 411 return -ERANGE; 412 413 cp += rv; 414 415 if (endp) 416 *endp = (char *)cp; 417 418 *res = (unsigned long)result; 419 return 0; 420 } 421 422 #define TMPBUFLEN 22 423 /** 424 * proc_get_long - reads an ASCII formatted integer from a user buffer 425 * 426 * @buf: a kernel buffer 427 * @size: size of the kernel buffer 428 * @val: this is where the number will be stored 429 * @neg: set to %TRUE if number is negative 430 * @perm_tr: a vector which contains the allowed trailers 431 * @perm_tr_len: size of the perm_tr vector 432 * @tr: pointer to store the trailer character 433 * 434 * In case of success %0 is returned and @buf and @size are updated with 435 * the amount of bytes read. If @tr is non-NULL and a trailing 436 * character exists (size is non-zero after returning from this 437 * function), @tr is updated with the trailing character. 438 */ 439 static int proc_get_long(char **buf, size_t *size, 440 unsigned long *val, bool *neg, 441 const char *perm_tr, unsigned perm_tr_len, char *tr) 442 { 443 int len; 444 char *p, tmp[TMPBUFLEN]; 445 446 if (!*size) 447 return -EINVAL; 448 449 len = *size; 450 if (len > TMPBUFLEN - 1) 451 len = TMPBUFLEN - 1; 452 453 memcpy(tmp, *buf, len); 454 455 tmp[len] = 0; 456 p = tmp; 457 if (*p == '-' && *size > 1) { 458 *neg = true; 459 p++; 460 } else 461 *neg = false; 462 if (!isdigit(*p)) 463 return -EINVAL; 464 465 if (strtoul_lenient(p, &p, 0, val)) 466 return -EINVAL; 467 468 len = p - tmp; 469 470 /* We don't know if the next char is whitespace thus we may accept 471 * invalid integers (e.g. 1234...a) or two integers instead of one 472 * (e.g. 123...1). So lets not allow such large numbers. */ 473 if (len == TMPBUFLEN - 1) 474 return -EINVAL; 475 476 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 477 return -EINVAL; 478 479 if (tr && (len < *size)) 480 *tr = *p; 481 482 *buf += len; 483 *size -= len; 484 485 return 0; 486 } 487 488 /** 489 * proc_put_long - converts an integer to a decimal ASCII formatted string 490 * 491 * @buf: the user buffer 492 * @size: the size of the user buffer 493 * @val: the integer to be converted 494 * @neg: sign of the number, %TRUE for negative 495 * 496 * In case of success @buf and @size are updated with the amount of bytes 497 * written. 498 */ 499 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg) 500 { 501 int len; 502 char tmp[TMPBUFLEN], *p = tmp; 503 504 sprintf(p, "%s%lu", neg ? "-" : "", val); 505 len = strlen(tmp); 506 if (len > *size) 507 len = *size; 508 memcpy(*buf, tmp, len); 509 *size -= len; 510 *buf += len; 511 } 512 #undef TMPBUFLEN 513 514 static void proc_put_char(void **buf, size_t *size, char c) 515 { 516 if (*size) { 517 char **buffer = (char **)buf; 518 **buffer = c; 519 520 (*size)--; 521 (*buffer)++; 522 *buf = *buffer; 523 } 524 } 525 526 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 527 int *valp, 528 int write, void *data) 529 { 530 if (write) { 531 if (*negp) { 532 if (*lvalp > (unsigned long) INT_MAX + 1) 533 return -EINVAL; 534 *valp = -*lvalp; 535 } else { 536 if (*lvalp > (unsigned long) INT_MAX) 537 return -EINVAL; 538 *valp = *lvalp; 539 } 540 } else { 541 int val = *valp; 542 if (val < 0) { 543 *negp = true; 544 *lvalp = -(unsigned long)val; 545 } else { 546 *negp = false; 547 *lvalp = (unsigned long)val; 548 } 549 } 550 return 0; 551 } 552 553 static int do_proc_douintvec_conv(unsigned long *lvalp, 554 unsigned int *valp, 555 int write, void *data) 556 { 557 if (write) { 558 if (*lvalp > UINT_MAX) 559 return -EINVAL; 560 *valp = *lvalp; 561 } else { 562 unsigned int val = *valp; 563 *lvalp = (unsigned long)val; 564 } 565 return 0; 566 } 567 568 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 569 570 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 571 int write, void *buffer, 572 size_t *lenp, loff_t *ppos, 573 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 574 int write, void *data), 575 void *data) 576 { 577 int *i, vleft, first = 1, err = 0; 578 size_t left; 579 char *p; 580 581 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 582 *lenp = 0; 583 return 0; 584 } 585 586 i = (int *) tbl_data; 587 vleft = table->maxlen / sizeof(*i); 588 left = *lenp; 589 590 if (!conv) 591 conv = do_proc_dointvec_conv; 592 593 if (write) { 594 if (proc_first_pos_non_zero_ignore(ppos, table)) 595 goto out; 596 597 if (left > PAGE_SIZE - 1) 598 left = PAGE_SIZE - 1; 599 p = buffer; 600 } 601 602 for (; left && vleft--; i++, first=0) { 603 unsigned long lval; 604 bool neg; 605 606 if (write) { 607 left -= proc_skip_spaces(&p); 608 609 if (!left) 610 break; 611 err = proc_get_long(&p, &left, &lval, &neg, 612 proc_wspace_sep, 613 sizeof(proc_wspace_sep), NULL); 614 if (err) 615 break; 616 if (conv(&neg, &lval, i, 1, data)) { 617 err = -EINVAL; 618 break; 619 } 620 } else { 621 if (conv(&neg, &lval, i, 0, data)) { 622 err = -EINVAL; 623 break; 624 } 625 if (!first) 626 proc_put_char(&buffer, &left, '\t'); 627 proc_put_long(&buffer, &left, lval, neg); 628 } 629 } 630 631 if (!write && !first && left && !err) 632 proc_put_char(&buffer, &left, '\n'); 633 if (write && !err && left) 634 left -= proc_skip_spaces(&p); 635 if (write && first) 636 return err ? : -EINVAL; 637 *lenp -= left; 638 out: 639 *ppos += *lenp; 640 return err; 641 } 642 643 static int do_proc_dointvec(struct ctl_table *table, int write, 644 void *buffer, size_t *lenp, loff_t *ppos, 645 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 646 int write, void *data), 647 void *data) 648 { 649 return __do_proc_dointvec(table->data, table, write, 650 buffer, lenp, ppos, conv, data); 651 } 652 653 static int do_proc_douintvec_w(unsigned int *tbl_data, 654 struct ctl_table *table, 655 void *buffer, 656 size_t *lenp, loff_t *ppos, 657 int (*conv)(unsigned long *lvalp, 658 unsigned int *valp, 659 int write, void *data), 660 void *data) 661 { 662 unsigned long lval; 663 int err = 0; 664 size_t left; 665 bool neg; 666 char *p = buffer; 667 668 left = *lenp; 669 670 if (proc_first_pos_non_zero_ignore(ppos, table)) 671 goto bail_early; 672 673 if (left > PAGE_SIZE - 1) 674 left = PAGE_SIZE - 1; 675 676 left -= proc_skip_spaces(&p); 677 if (!left) { 678 err = -EINVAL; 679 goto out_free; 680 } 681 682 err = proc_get_long(&p, &left, &lval, &neg, 683 proc_wspace_sep, 684 sizeof(proc_wspace_sep), NULL); 685 if (err || neg) { 686 err = -EINVAL; 687 goto out_free; 688 } 689 690 if (conv(&lval, tbl_data, 1, data)) { 691 err = -EINVAL; 692 goto out_free; 693 } 694 695 if (!err && left) 696 left -= proc_skip_spaces(&p); 697 698 out_free: 699 if (err) 700 return -EINVAL; 701 702 return 0; 703 704 /* This is in keeping with old __do_proc_dointvec() */ 705 bail_early: 706 *ppos += *lenp; 707 return err; 708 } 709 710 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer, 711 size_t *lenp, loff_t *ppos, 712 int (*conv)(unsigned long *lvalp, 713 unsigned int *valp, 714 int write, void *data), 715 void *data) 716 { 717 unsigned long lval; 718 int err = 0; 719 size_t left; 720 721 left = *lenp; 722 723 if (conv(&lval, tbl_data, 0, data)) { 724 err = -EINVAL; 725 goto out; 726 } 727 728 proc_put_long(&buffer, &left, lval, false); 729 if (!left) 730 goto out; 731 732 proc_put_char(&buffer, &left, '\n'); 733 734 out: 735 *lenp -= left; 736 *ppos += *lenp; 737 738 return err; 739 } 740 741 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, 742 int write, void *buffer, 743 size_t *lenp, loff_t *ppos, 744 int (*conv)(unsigned long *lvalp, 745 unsigned int *valp, 746 int write, void *data), 747 void *data) 748 { 749 unsigned int *i, vleft; 750 751 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 752 *lenp = 0; 753 return 0; 754 } 755 756 i = (unsigned int *) tbl_data; 757 vleft = table->maxlen / sizeof(*i); 758 759 /* 760 * Arrays are not supported, keep this simple. *Do not* add 761 * support for them. 762 */ 763 if (vleft != 1) { 764 *lenp = 0; 765 return -EINVAL; 766 } 767 768 if (!conv) 769 conv = do_proc_douintvec_conv; 770 771 if (write) 772 return do_proc_douintvec_w(i, table, buffer, lenp, ppos, 773 conv, data); 774 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); 775 } 776 777 static int do_proc_douintvec(struct ctl_table *table, int write, 778 void *buffer, size_t *lenp, loff_t *ppos, 779 int (*conv)(unsigned long *lvalp, 780 unsigned int *valp, 781 int write, void *data), 782 void *data) 783 { 784 return __do_proc_douintvec(table->data, table, write, 785 buffer, lenp, ppos, conv, data); 786 } 787 788 /** 789 * proc_dointvec - read a vector of integers 790 * @table: the sysctl table 791 * @write: %TRUE if this is a write to the sysctl file 792 * @buffer: the user buffer 793 * @lenp: the size of the user buffer 794 * @ppos: file position 795 * 796 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 797 * values from/to the user buffer, treated as an ASCII string. 798 * 799 * Returns 0 on success. 800 */ 801 int proc_dointvec(struct ctl_table *table, int write, void *buffer, 802 size_t *lenp, loff_t *ppos) 803 { 804 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 805 } 806 807 #ifdef CONFIG_COMPACTION 808 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table, 809 int write, void *buffer, size_t *lenp, loff_t *ppos) 810 { 811 int ret, old; 812 813 if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write) 814 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 815 816 old = *(int *)table->data; 817 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 818 if (ret) 819 return ret; 820 if (old != *(int *)table->data) 821 pr_warn_once("sysctl attribute %s changed by %s[%d]\n", 822 table->procname, current->comm, 823 task_pid_nr(current)); 824 return ret; 825 } 826 #endif 827 828 /** 829 * proc_douintvec - read a vector of unsigned integers 830 * @table: the sysctl table 831 * @write: %TRUE if this is a write to the sysctl file 832 * @buffer: the user buffer 833 * @lenp: the size of the user buffer 834 * @ppos: file position 835 * 836 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 837 * values from/to the user buffer, treated as an ASCII string. 838 * 839 * Returns 0 on success. 840 */ 841 int proc_douintvec(struct ctl_table *table, int write, void *buffer, 842 size_t *lenp, loff_t *ppos) 843 { 844 return do_proc_douintvec(table, write, buffer, lenp, ppos, 845 do_proc_douintvec_conv, NULL); 846 } 847 848 /* 849 * Taint values can only be increased 850 * This means we can safely use a temporary. 851 */ 852 static int proc_taint(struct ctl_table *table, int write, 853 void *buffer, size_t *lenp, loff_t *ppos) 854 { 855 struct ctl_table t; 856 unsigned long tmptaint = get_taint(); 857 int err; 858 859 if (write && !capable(CAP_SYS_ADMIN)) 860 return -EPERM; 861 862 t = *table; 863 t.data = &tmptaint; 864 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 865 if (err < 0) 866 return err; 867 868 if (write) { 869 int i; 870 871 /* 872 * If we are relying on panic_on_taint not producing 873 * false positives due to userspace input, bail out 874 * before setting the requested taint flags. 875 */ 876 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint)) 877 return -EINVAL; 878 879 /* 880 * Poor man's atomic or. Not worth adding a primitive 881 * to everyone's atomic.h for this 882 */ 883 for (i = 0; i < TAINT_FLAGS_COUNT; i++) 884 if ((1UL << i) & tmptaint) 885 add_taint(i, LOCKDEP_STILL_OK); 886 } 887 888 return err; 889 } 890 891 #ifdef CONFIG_PRINTK 892 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 893 void *buffer, size_t *lenp, loff_t *ppos) 894 { 895 if (write && !capable(CAP_SYS_ADMIN)) 896 return -EPERM; 897 898 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 899 } 900 #endif 901 902 /** 903 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure 904 * @min: pointer to minimum allowable value 905 * @max: pointer to maximum allowable value 906 * 907 * The do_proc_dointvec_minmax_conv_param structure provides the 908 * minimum and maximum values for doing range checking for those sysctl 909 * parameters that use the proc_dointvec_minmax() handler. 910 */ 911 struct do_proc_dointvec_minmax_conv_param { 912 int *min; 913 int *max; 914 }; 915 916 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 917 int *valp, 918 int write, void *data) 919 { 920 int tmp, ret; 921 struct do_proc_dointvec_minmax_conv_param *param = data; 922 /* 923 * If writing, first do so via a temporary local int so we can 924 * bounds-check it before touching *valp. 925 */ 926 int *ip = write ? &tmp : valp; 927 928 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data); 929 if (ret) 930 return ret; 931 932 if (write) { 933 if ((param->min && *param->min > tmp) || 934 (param->max && *param->max < tmp)) 935 return -EINVAL; 936 *valp = tmp; 937 } 938 939 return 0; 940 } 941 942 /** 943 * proc_dointvec_minmax - read a vector of integers with min/max values 944 * @table: the sysctl table 945 * @write: %TRUE if this is a write to the sysctl file 946 * @buffer: the user buffer 947 * @lenp: the size of the user buffer 948 * @ppos: file position 949 * 950 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 951 * values from/to the user buffer, treated as an ASCII string. 952 * 953 * This routine will ensure the values are within the range specified by 954 * table->extra1 (min) and table->extra2 (max). 955 * 956 * Returns 0 on success or -EINVAL on write when the range check fails. 957 */ 958 int proc_dointvec_minmax(struct ctl_table *table, int write, 959 void *buffer, size_t *lenp, loff_t *ppos) 960 { 961 struct do_proc_dointvec_minmax_conv_param param = { 962 .min = (int *) table->extra1, 963 .max = (int *) table->extra2, 964 }; 965 return do_proc_dointvec(table, write, buffer, lenp, ppos, 966 do_proc_dointvec_minmax_conv, ¶m); 967 } 968 969 /** 970 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure 971 * @min: pointer to minimum allowable value 972 * @max: pointer to maximum allowable value 973 * 974 * The do_proc_douintvec_minmax_conv_param structure provides the 975 * minimum and maximum values for doing range checking for those sysctl 976 * parameters that use the proc_douintvec_minmax() handler. 977 */ 978 struct do_proc_douintvec_minmax_conv_param { 979 unsigned int *min; 980 unsigned int *max; 981 }; 982 983 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, 984 unsigned int *valp, 985 int write, void *data) 986 { 987 int ret; 988 unsigned int tmp; 989 struct do_proc_douintvec_minmax_conv_param *param = data; 990 /* write via temporary local uint for bounds-checking */ 991 unsigned int *up = write ? &tmp : valp; 992 993 ret = do_proc_douintvec_conv(lvalp, up, write, data); 994 if (ret) 995 return ret; 996 997 if (write) { 998 if ((param->min && *param->min > tmp) || 999 (param->max && *param->max < tmp)) 1000 return -ERANGE; 1001 1002 *valp = tmp; 1003 } 1004 1005 return 0; 1006 } 1007 1008 /** 1009 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values 1010 * @table: the sysctl table 1011 * @write: %TRUE if this is a write to the sysctl file 1012 * @buffer: the user buffer 1013 * @lenp: the size of the user buffer 1014 * @ppos: file position 1015 * 1016 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 1017 * values from/to the user buffer, treated as an ASCII string. Negative 1018 * strings are not allowed. 1019 * 1020 * This routine will ensure the values are within the range specified by 1021 * table->extra1 (min) and table->extra2 (max). There is a final sanity 1022 * check for UINT_MAX to avoid having to support wrap around uses from 1023 * userspace. 1024 * 1025 * Returns 0 on success or -ERANGE on write when the range check fails. 1026 */ 1027 int proc_douintvec_minmax(struct ctl_table *table, int write, 1028 void *buffer, size_t *lenp, loff_t *ppos) 1029 { 1030 struct do_proc_douintvec_minmax_conv_param param = { 1031 .min = (unsigned int *) table->extra1, 1032 .max = (unsigned int *) table->extra2, 1033 }; 1034 return do_proc_douintvec(table, write, buffer, lenp, ppos, 1035 do_proc_douintvec_minmax_conv, ¶m); 1036 } 1037 1038 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp, 1039 unsigned int *valp, 1040 int write, void *data) 1041 { 1042 if (write) { 1043 unsigned int val; 1044 1045 val = round_pipe_size(*lvalp); 1046 if (val == 0) 1047 return -EINVAL; 1048 1049 *valp = val; 1050 } else { 1051 unsigned int val = *valp; 1052 *lvalp = (unsigned long) val; 1053 } 1054 1055 return 0; 1056 } 1057 1058 static int proc_dopipe_max_size(struct ctl_table *table, int write, 1059 void *buffer, size_t *lenp, loff_t *ppos) 1060 { 1061 return do_proc_douintvec(table, write, buffer, lenp, ppos, 1062 do_proc_dopipe_max_size_conv, NULL); 1063 } 1064 1065 static void validate_coredump_safety(void) 1066 { 1067 #ifdef CONFIG_COREDUMP 1068 if (suid_dumpable == SUID_DUMP_ROOT && 1069 core_pattern[0] != '/' && core_pattern[0] != '|') { 1070 printk(KERN_WARNING 1071 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 1072 "Pipe handler or fully qualified core dump path required.\n" 1073 "Set kernel.core_pattern before fs.suid_dumpable.\n" 1074 ); 1075 } 1076 #endif 1077 } 1078 1079 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 1080 void *buffer, size_t *lenp, loff_t *ppos) 1081 { 1082 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 1083 if (!error) 1084 validate_coredump_safety(); 1085 return error; 1086 } 1087 1088 #ifdef CONFIG_COREDUMP 1089 static int proc_dostring_coredump(struct ctl_table *table, int write, 1090 void *buffer, size_t *lenp, loff_t *ppos) 1091 { 1092 int error = proc_dostring(table, write, buffer, lenp, ppos); 1093 if (!error) 1094 validate_coredump_safety(); 1095 return error; 1096 } 1097 #endif 1098 1099 #ifdef CONFIG_MAGIC_SYSRQ 1100 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 1101 void *buffer, size_t *lenp, loff_t *ppos) 1102 { 1103 int tmp, ret; 1104 1105 tmp = sysrq_mask(); 1106 1107 ret = __do_proc_dointvec(&tmp, table, write, buffer, 1108 lenp, ppos, NULL, NULL); 1109 if (ret || !write) 1110 return ret; 1111 1112 if (write) 1113 sysrq_toggle_support(tmp); 1114 1115 return 0; 1116 } 1117 #endif 1118 1119 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, 1120 int write, void *buffer, size_t *lenp, loff_t *ppos, 1121 unsigned long convmul, unsigned long convdiv) 1122 { 1123 unsigned long *i, *min, *max; 1124 int vleft, first = 1, err = 0; 1125 size_t left; 1126 char *p; 1127 1128 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 1129 *lenp = 0; 1130 return 0; 1131 } 1132 1133 i = (unsigned long *) data; 1134 min = (unsigned long *) table->extra1; 1135 max = (unsigned long *) table->extra2; 1136 vleft = table->maxlen / sizeof(unsigned long); 1137 left = *lenp; 1138 1139 if (write) { 1140 if (proc_first_pos_non_zero_ignore(ppos, table)) 1141 goto out; 1142 1143 if (left > PAGE_SIZE - 1) 1144 left = PAGE_SIZE - 1; 1145 p = buffer; 1146 } 1147 1148 for (; left && vleft--; i++, first = 0) { 1149 unsigned long val; 1150 1151 if (write) { 1152 bool neg; 1153 1154 left -= proc_skip_spaces(&p); 1155 if (!left) 1156 break; 1157 1158 err = proc_get_long(&p, &left, &val, &neg, 1159 proc_wspace_sep, 1160 sizeof(proc_wspace_sep), NULL); 1161 if (err) 1162 break; 1163 if (neg) 1164 continue; 1165 val = convmul * val / convdiv; 1166 if ((min && val < *min) || (max && val > *max)) { 1167 err = -EINVAL; 1168 break; 1169 } 1170 *i = val; 1171 } else { 1172 val = convdiv * (*i) / convmul; 1173 if (!first) 1174 proc_put_char(&buffer, &left, '\t'); 1175 proc_put_long(&buffer, &left, val, false); 1176 } 1177 } 1178 1179 if (!write && !first && left && !err) 1180 proc_put_char(&buffer, &left, '\n'); 1181 if (write && !err) 1182 left -= proc_skip_spaces(&p); 1183 if (write && first) 1184 return err ? : -EINVAL; 1185 *lenp -= left; 1186 out: 1187 *ppos += *lenp; 1188 return err; 1189 } 1190 1191 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 1192 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul, 1193 unsigned long convdiv) 1194 { 1195 return __do_proc_doulongvec_minmax(table->data, table, write, 1196 buffer, lenp, ppos, convmul, convdiv); 1197 } 1198 1199 /** 1200 * proc_doulongvec_minmax - read a vector of long integers with min/max values 1201 * @table: the sysctl table 1202 * @write: %TRUE if this is a write to the sysctl file 1203 * @buffer: the user buffer 1204 * @lenp: the size of the user buffer 1205 * @ppos: file position 1206 * 1207 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 1208 * values from/to the user buffer, treated as an ASCII string. 1209 * 1210 * This routine will ensure the values are within the range specified by 1211 * table->extra1 (min) and table->extra2 (max). 1212 * 1213 * Returns 0 on success. 1214 */ 1215 int proc_doulongvec_minmax(struct ctl_table *table, int write, 1216 void *buffer, size_t *lenp, loff_t *ppos) 1217 { 1218 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 1219 } 1220 1221 /** 1222 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 1223 * @table: the sysctl table 1224 * @write: %TRUE if this is a write to the sysctl file 1225 * @buffer: the user buffer 1226 * @lenp: the size of the user buffer 1227 * @ppos: file position 1228 * 1229 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 1230 * values from/to the user buffer, treated as an ASCII string. The values 1231 * are treated as milliseconds, and converted to jiffies when they are stored. 1232 * 1233 * This routine will ensure the values are within the range specified by 1234 * table->extra1 (min) and table->extra2 (max). 1235 * 1236 * Returns 0 on success. 1237 */ 1238 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 1239 void *buffer, size_t *lenp, loff_t *ppos) 1240 { 1241 return do_proc_doulongvec_minmax(table, write, buffer, 1242 lenp, ppos, HZ, 1000l); 1243 } 1244 1245 1246 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 1247 int *valp, 1248 int write, void *data) 1249 { 1250 if (write) { 1251 if (*lvalp > INT_MAX / HZ) 1252 return 1; 1253 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 1254 } else { 1255 int val = *valp; 1256 unsigned long lval; 1257 if (val < 0) { 1258 *negp = true; 1259 lval = -(unsigned long)val; 1260 } else { 1261 *negp = false; 1262 lval = (unsigned long)val; 1263 } 1264 *lvalp = lval / HZ; 1265 } 1266 return 0; 1267 } 1268 1269 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 1270 int *valp, 1271 int write, void *data) 1272 { 1273 if (write) { 1274 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 1275 return 1; 1276 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 1277 } else { 1278 int val = *valp; 1279 unsigned long lval; 1280 if (val < 0) { 1281 *negp = true; 1282 lval = -(unsigned long)val; 1283 } else { 1284 *negp = false; 1285 lval = (unsigned long)val; 1286 } 1287 *lvalp = jiffies_to_clock_t(lval); 1288 } 1289 return 0; 1290 } 1291 1292 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 1293 int *valp, 1294 int write, void *data) 1295 { 1296 if (write) { 1297 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 1298 1299 if (jif > INT_MAX) 1300 return 1; 1301 *valp = (int)jif; 1302 } else { 1303 int val = *valp; 1304 unsigned long lval; 1305 if (val < 0) { 1306 *negp = true; 1307 lval = -(unsigned long)val; 1308 } else { 1309 *negp = false; 1310 lval = (unsigned long)val; 1311 } 1312 *lvalp = jiffies_to_msecs(lval); 1313 } 1314 return 0; 1315 } 1316 1317 /** 1318 * proc_dointvec_jiffies - read a vector of integers as seconds 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 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1326 * values from/to the user buffer, treated as an ASCII string. 1327 * The values read are assumed to be in seconds, and are converted into 1328 * jiffies. 1329 * 1330 * Returns 0 on success. 1331 */ 1332 int proc_dointvec_jiffies(struct ctl_table *table, int write, 1333 void *buffer, size_t *lenp, loff_t *ppos) 1334 { 1335 return do_proc_dointvec(table,write,buffer,lenp,ppos, 1336 do_proc_dointvec_jiffies_conv,NULL); 1337 } 1338 1339 /** 1340 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 1341 * @table: the sysctl table 1342 * @write: %TRUE if this is a write to the sysctl file 1343 * @buffer: the user buffer 1344 * @lenp: the size of the user buffer 1345 * @ppos: pointer to the file position 1346 * 1347 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1348 * values from/to the user buffer, treated as an ASCII string. 1349 * The values read are assumed to be in 1/USER_HZ seconds, and 1350 * are converted into jiffies. 1351 * 1352 * Returns 0 on success. 1353 */ 1354 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 1355 void *buffer, size_t *lenp, loff_t *ppos) 1356 { 1357 return do_proc_dointvec(table,write,buffer,lenp,ppos, 1358 do_proc_dointvec_userhz_jiffies_conv,NULL); 1359 } 1360 1361 /** 1362 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 1363 * @table: the sysctl table 1364 * @write: %TRUE if this is a write to the sysctl file 1365 * @buffer: the user buffer 1366 * @lenp: the size of the user buffer 1367 * @ppos: file position 1368 * @ppos: the current position in the file 1369 * 1370 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1371 * values from/to the user buffer, treated as an ASCII string. 1372 * The values read are assumed to be in 1/1000 seconds, and 1373 * are converted into jiffies. 1374 * 1375 * Returns 0 on success. 1376 */ 1377 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer, 1378 size_t *lenp, loff_t *ppos) 1379 { 1380 return do_proc_dointvec(table, write, buffer, lenp, ppos, 1381 do_proc_dointvec_ms_jiffies_conv, NULL); 1382 } 1383 1384 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer, 1385 size_t *lenp, loff_t *ppos) 1386 { 1387 struct pid *new_pid; 1388 pid_t tmp; 1389 int r; 1390 1391 tmp = pid_vnr(cad_pid); 1392 1393 r = __do_proc_dointvec(&tmp, table, write, buffer, 1394 lenp, ppos, NULL, NULL); 1395 if (r || !write) 1396 return r; 1397 1398 new_pid = find_get_pid(tmp); 1399 if (!new_pid) 1400 return -ESRCH; 1401 1402 put_pid(xchg(&cad_pid, new_pid)); 1403 return 0; 1404 } 1405 1406 /** 1407 * proc_do_large_bitmap - read/write from/to a large bitmap 1408 * @table: the sysctl table 1409 * @write: %TRUE if this is a write to the sysctl file 1410 * @buffer: the user buffer 1411 * @lenp: the size of the user buffer 1412 * @ppos: file position 1413 * 1414 * The bitmap is stored at table->data and the bitmap length (in bits) 1415 * in table->maxlen. 1416 * 1417 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 1418 * large bitmaps may be represented in a compact manner. Writing into 1419 * the file will clear the bitmap then update it with the given input. 1420 * 1421 * Returns 0 on success. 1422 */ 1423 int proc_do_large_bitmap(struct ctl_table *table, int write, 1424 void *buffer, size_t *lenp, loff_t *ppos) 1425 { 1426 int err = 0; 1427 bool first = 1; 1428 size_t left = *lenp; 1429 unsigned long bitmap_len = table->maxlen; 1430 unsigned long *bitmap = *(unsigned long **) table->data; 1431 unsigned long *tmp_bitmap = NULL; 1432 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 1433 1434 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 1435 *lenp = 0; 1436 return 0; 1437 } 1438 1439 if (write) { 1440 char *p = buffer; 1441 size_t skipped = 0; 1442 1443 if (left > PAGE_SIZE - 1) { 1444 left = PAGE_SIZE - 1; 1445 /* How much of the buffer we'll skip this pass */ 1446 skipped = *lenp - left; 1447 } 1448 1449 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL); 1450 if (!tmp_bitmap) 1451 return -ENOMEM; 1452 proc_skip_char(&p, &left, '\n'); 1453 while (!err && left) { 1454 unsigned long val_a, val_b; 1455 bool neg; 1456 size_t saved_left; 1457 1458 /* In case we stop parsing mid-number, we can reset */ 1459 saved_left = left; 1460 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 1461 sizeof(tr_a), &c); 1462 /* 1463 * If we consumed the entirety of a truncated buffer or 1464 * only one char is left (may be a "-"), then stop here, 1465 * reset, & come back for more. 1466 */ 1467 if ((left <= 1) && skipped) { 1468 left = saved_left; 1469 break; 1470 } 1471 1472 if (err) 1473 break; 1474 if (val_a >= bitmap_len || neg) { 1475 err = -EINVAL; 1476 break; 1477 } 1478 1479 val_b = val_a; 1480 if (left) { 1481 p++; 1482 left--; 1483 } 1484 1485 if (c == '-') { 1486 err = proc_get_long(&p, &left, &val_b, 1487 &neg, tr_b, sizeof(tr_b), 1488 &c); 1489 /* 1490 * If we consumed all of a truncated buffer or 1491 * then stop here, reset, & come back for more. 1492 */ 1493 if (!left && skipped) { 1494 left = saved_left; 1495 break; 1496 } 1497 1498 if (err) 1499 break; 1500 if (val_b >= bitmap_len || neg || 1501 val_a > val_b) { 1502 err = -EINVAL; 1503 break; 1504 } 1505 if (left) { 1506 p++; 1507 left--; 1508 } 1509 } 1510 1511 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 1512 first = 0; 1513 proc_skip_char(&p, &left, '\n'); 1514 } 1515 left += skipped; 1516 } else { 1517 unsigned long bit_a, bit_b = 0; 1518 1519 while (left) { 1520 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 1521 if (bit_a >= bitmap_len) 1522 break; 1523 bit_b = find_next_zero_bit(bitmap, bitmap_len, 1524 bit_a + 1) - 1; 1525 1526 if (!first) 1527 proc_put_char(&buffer, &left, ','); 1528 proc_put_long(&buffer, &left, bit_a, false); 1529 if (bit_a != bit_b) { 1530 proc_put_char(&buffer, &left, '-'); 1531 proc_put_long(&buffer, &left, bit_b, false); 1532 } 1533 1534 first = 0; bit_b++; 1535 } 1536 proc_put_char(&buffer, &left, '\n'); 1537 } 1538 1539 if (!err) { 1540 if (write) { 1541 if (*ppos) 1542 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 1543 else 1544 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 1545 } 1546 *lenp -= left; 1547 *ppos += *lenp; 1548 } 1549 1550 bitmap_free(tmp_bitmap); 1551 return err; 1552 } 1553 1554 #else /* CONFIG_PROC_SYSCTL */ 1555 1556 int proc_dostring(struct ctl_table *table, int write, 1557 void *buffer, size_t *lenp, loff_t *ppos) 1558 { 1559 return -ENOSYS; 1560 } 1561 1562 int proc_dointvec(struct ctl_table *table, int write, 1563 void *buffer, size_t *lenp, loff_t *ppos) 1564 { 1565 return -ENOSYS; 1566 } 1567 1568 int proc_douintvec(struct ctl_table *table, int write, 1569 void *buffer, size_t *lenp, loff_t *ppos) 1570 { 1571 return -ENOSYS; 1572 } 1573 1574 int proc_dointvec_minmax(struct ctl_table *table, int write, 1575 void *buffer, size_t *lenp, loff_t *ppos) 1576 { 1577 return -ENOSYS; 1578 } 1579 1580 int proc_douintvec_minmax(struct ctl_table *table, int write, 1581 void *buffer, size_t *lenp, loff_t *ppos) 1582 { 1583 return -ENOSYS; 1584 } 1585 1586 int proc_dointvec_jiffies(struct ctl_table *table, int write, 1587 void *buffer, size_t *lenp, loff_t *ppos) 1588 { 1589 return -ENOSYS; 1590 } 1591 1592 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 1593 void *buffer, size_t *lenp, loff_t *ppos) 1594 { 1595 return -ENOSYS; 1596 } 1597 1598 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 1599 void *buffer, size_t *lenp, loff_t *ppos) 1600 { 1601 return -ENOSYS; 1602 } 1603 1604 int proc_doulongvec_minmax(struct ctl_table *table, int write, 1605 void *buffer, size_t *lenp, loff_t *ppos) 1606 { 1607 return -ENOSYS; 1608 } 1609 1610 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 1611 void *buffer, size_t *lenp, loff_t *ppos) 1612 { 1613 return -ENOSYS; 1614 } 1615 1616 int proc_do_large_bitmap(struct ctl_table *table, int write, 1617 void *buffer, size_t *lenp, loff_t *ppos) 1618 { 1619 return -ENOSYS; 1620 } 1621 1622 #endif /* CONFIG_PROC_SYSCTL */ 1623 1624 #if defined(CONFIG_SYSCTL) 1625 int proc_do_static_key(struct ctl_table *table, int write, 1626 void *buffer, size_t *lenp, loff_t *ppos) 1627 { 1628 struct static_key *key = (struct static_key *)table->data; 1629 static DEFINE_MUTEX(static_key_mutex); 1630 int val, ret; 1631 struct ctl_table tmp = { 1632 .data = &val, 1633 .maxlen = sizeof(val), 1634 .mode = table->mode, 1635 .extra1 = SYSCTL_ZERO, 1636 .extra2 = SYSCTL_ONE, 1637 }; 1638 1639 if (write && !capable(CAP_SYS_ADMIN)) 1640 return -EPERM; 1641 1642 mutex_lock(&static_key_mutex); 1643 val = static_key_enabled(key); 1644 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 1645 if (write && !ret) { 1646 if (val) 1647 static_key_enable(key); 1648 else 1649 static_key_disable(key); 1650 } 1651 mutex_unlock(&static_key_mutex); 1652 return ret; 1653 } 1654 1655 static struct ctl_table kern_table[] = { 1656 { 1657 .procname = "sched_child_runs_first", 1658 .data = &sysctl_sched_child_runs_first, 1659 .maxlen = sizeof(unsigned int), 1660 .mode = 0644, 1661 .proc_handler = proc_dointvec, 1662 }, 1663 #ifdef CONFIG_SCHED_DEBUG 1664 { 1665 .procname = "sched_min_granularity_ns", 1666 .data = &sysctl_sched_min_granularity, 1667 .maxlen = sizeof(unsigned int), 1668 .mode = 0644, 1669 .proc_handler = sched_proc_update_handler, 1670 .extra1 = &min_sched_granularity_ns, 1671 .extra2 = &max_sched_granularity_ns, 1672 }, 1673 { 1674 .procname = "sched_latency_ns", 1675 .data = &sysctl_sched_latency, 1676 .maxlen = sizeof(unsigned int), 1677 .mode = 0644, 1678 .proc_handler = sched_proc_update_handler, 1679 .extra1 = &min_sched_granularity_ns, 1680 .extra2 = &max_sched_granularity_ns, 1681 }, 1682 { 1683 .procname = "sched_wakeup_granularity_ns", 1684 .data = &sysctl_sched_wakeup_granularity, 1685 .maxlen = sizeof(unsigned int), 1686 .mode = 0644, 1687 .proc_handler = sched_proc_update_handler, 1688 .extra1 = &min_wakeup_granularity_ns, 1689 .extra2 = &max_wakeup_granularity_ns, 1690 }, 1691 #ifdef CONFIG_SMP 1692 { 1693 .procname = "sched_tunable_scaling", 1694 .data = &sysctl_sched_tunable_scaling, 1695 .maxlen = sizeof(enum sched_tunable_scaling), 1696 .mode = 0644, 1697 .proc_handler = sched_proc_update_handler, 1698 .extra1 = &min_sched_tunable_scaling, 1699 .extra2 = &max_sched_tunable_scaling, 1700 }, 1701 { 1702 .procname = "sched_migration_cost_ns", 1703 .data = &sysctl_sched_migration_cost, 1704 .maxlen = sizeof(unsigned int), 1705 .mode = 0644, 1706 .proc_handler = proc_dointvec, 1707 }, 1708 { 1709 .procname = "sched_nr_migrate", 1710 .data = &sysctl_sched_nr_migrate, 1711 .maxlen = sizeof(unsigned int), 1712 .mode = 0644, 1713 .proc_handler = proc_dointvec, 1714 }, 1715 #ifdef CONFIG_SCHEDSTATS 1716 { 1717 .procname = "sched_schedstats", 1718 .data = NULL, 1719 .maxlen = sizeof(unsigned int), 1720 .mode = 0644, 1721 .proc_handler = sysctl_schedstats, 1722 .extra1 = SYSCTL_ZERO, 1723 .extra2 = SYSCTL_ONE, 1724 }, 1725 #endif /* CONFIG_SCHEDSTATS */ 1726 #endif /* CONFIG_SMP */ 1727 #ifdef CONFIG_NUMA_BALANCING 1728 { 1729 .procname = "numa_balancing_scan_delay_ms", 1730 .data = &sysctl_numa_balancing_scan_delay, 1731 .maxlen = sizeof(unsigned int), 1732 .mode = 0644, 1733 .proc_handler = proc_dointvec, 1734 }, 1735 { 1736 .procname = "numa_balancing_scan_period_min_ms", 1737 .data = &sysctl_numa_balancing_scan_period_min, 1738 .maxlen = sizeof(unsigned int), 1739 .mode = 0644, 1740 .proc_handler = proc_dointvec, 1741 }, 1742 { 1743 .procname = "numa_balancing_scan_period_max_ms", 1744 .data = &sysctl_numa_balancing_scan_period_max, 1745 .maxlen = sizeof(unsigned int), 1746 .mode = 0644, 1747 .proc_handler = proc_dointvec, 1748 }, 1749 { 1750 .procname = "numa_balancing_scan_size_mb", 1751 .data = &sysctl_numa_balancing_scan_size, 1752 .maxlen = sizeof(unsigned int), 1753 .mode = 0644, 1754 .proc_handler = proc_dointvec_minmax, 1755 .extra1 = SYSCTL_ONE, 1756 }, 1757 { 1758 .procname = "numa_balancing", 1759 .data = NULL, /* filled in by handler */ 1760 .maxlen = sizeof(unsigned int), 1761 .mode = 0644, 1762 .proc_handler = sysctl_numa_balancing, 1763 .extra1 = SYSCTL_ZERO, 1764 .extra2 = SYSCTL_ONE, 1765 }, 1766 #endif /* CONFIG_NUMA_BALANCING */ 1767 #endif /* CONFIG_SCHED_DEBUG */ 1768 { 1769 .procname = "sched_rt_period_us", 1770 .data = &sysctl_sched_rt_period, 1771 .maxlen = sizeof(unsigned int), 1772 .mode = 0644, 1773 .proc_handler = sched_rt_handler, 1774 }, 1775 { 1776 .procname = "sched_rt_runtime_us", 1777 .data = &sysctl_sched_rt_runtime, 1778 .maxlen = sizeof(int), 1779 .mode = 0644, 1780 .proc_handler = sched_rt_handler, 1781 }, 1782 { 1783 .procname = "sched_deadline_period_max_us", 1784 .data = &sysctl_sched_dl_period_max, 1785 .maxlen = sizeof(unsigned int), 1786 .mode = 0644, 1787 .proc_handler = proc_dointvec, 1788 }, 1789 { 1790 .procname = "sched_deadline_period_min_us", 1791 .data = &sysctl_sched_dl_period_min, 1792 .maxlen = sizeof(unsigned int), 1793 .mode = 0644, 1794 .proc_handler = proc_dointvec, 1795 }, 1796 { 1797 .procname = "sched_rr_timeslice_ms", 1798 .data = &sysctl_sched_rr_timeslice, 1799 .maxlen = sizeof(int), 1800 .mode = 0644, 1801 .proc_handler = sched_rr_handler, 1802 }, 1803 #ifdef CONFIG_UCLAMP_TASK 1804 { 1805 .procname = "sched_util_clamp_min", 1806 .data = &sysctl_sched_uclamp_util_min, 1807 .maxlen = sizeof(unsigned int), 1808 .mode = 0644, 1809 .proc_handler = sysctl_sched_uclamp_handler, 1810 }, 1811 { 1812 .procname = "sched_util_clamp_max", 1813 .data = &sysctl_sched_uclamp_util_max, 1814 .maxlen = sizeof(unsigned int), 1815 .mode = 0644, 1816 .proc_handler = sysctl_sched_uclamp_handler, 1817 }, 1818 { 1819 .procname = "sched_util_clamp_min_rt_default", 1820 .data = &sysctl_sched_uclamp_util_min_rt_default, 1821 .maxlen = sizeof(unsigned int), 1822 .mode = 0644, 1823 .proc_handler = sysctl_sched_uclamp_handler, 1824 }, 1825 #endif 1826 #ifdef CONFIG_SCHED_AUTOGROUP 1827 { 1828 .procname = "sched_autogroup_enabled", 1829 .data = &sysctl_sched_autogroup_enabled, 1830 .maxlen = sizeof(unsigned int), 1831 .mode = 0644, 1832 .proc_handler = proc_dointvec_minmax, 1833 .extra1 = SYSCTL_ZERO, 1834 .extra2 = SYSCTL_ONE, 1835 }, 1836 #endif 1837 #ifdef CONFIG_CFS_BANDWIDTH 1838 { 1839 .procname = "sched_cfs_bandwidth_slice_us", 1840 .data = &sysctl_sched_cfs_bandwidth_slice, 1841 .maxlen = sizeof(unsigned int), 1842 .mode = 0644, 1843 .proc_handler = proc_dointvec_minmax, 1844 .extra1 = SYSCTL_ONE, 1845 }, 1846 #endif 1847 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) 1848 { 1849 .procname = "sched_energy_aware", 1850 .data = &sysctl_sched_energy_aware, 1851 .maxlen = sizeof(unsigned int), 1852 .mode = 0644, 1853 .proc_handler = sched_energy_aware_handler, 1854 .extra1 = SYSCTL_ZERO, 1855 .extra2 = SYSCTL_ONE, 1856 }, 1857 #endif 1858 #ifdef CONFIG_PROVE_LOCKING 1859 { 1860 .procname = "prove_locking", 1861 .data = &prove_locking, 1862 .maxlen = sizeof(int), 1863 .mode = 0644, 1864 .proc_handler = proc_dointvec, 1865 }, 1866 #endif 1867 #ifdef CONFIG_LOCK_STAT 1868 { 1869 .procname = "lock_stat", 1870 .data = &lock_stat, 1871 .maxlen = sizeof(int), 1872 .mode = 0644, 1873 .proc_handler = proc_dointvec, 1874 }, 1875 #endif 1876 { 1877 .procname = "panic", 1878 .data = &panic_timeout, 1879 .maxlen = sizeof(int), 1880 .mode = 0644, 1881 .proc_handler = proc_dointvec, 1882 }, 1883 #ifdef CONFIG_COREDUMP 1884 { 1885 .procname = "core_uses_pid", 1886 .data = &core_uses_pid, 1887 .maxlen = sizeof(int), 1888 .mode = 0644, 1889 .proc_handler = proc_dointvec, 1890 }, 1891 { 1892 .procname = "core_pattern", 1893 .data = core_pattern, 1894 .maxlen = CORENAME_MAX_SIZE, 1895 .mode = 0644, 1896 .proc_handler = proc_dostring_coredump, 1897 }, 1898 { 1899 .procname = "core_pipe_limit", 1900 .data = &core_pipe_limit, 1901 .maxlen = sizeof(unsigned int), 1902 .mode = 0644, 1903 .proc_handler = proc_dointvec, 1904 }, 1905 #endif 1906 #ifdef CONFIG_PROC_SYSCTL 1907 { 1908 .procname = "tainted", 1909 .maxlen = sizeof(long), 1910 .mode = 0644, 1911 .proc_handler = proc_taint, 1912 }, 1913 { 1914 .procname = "sysctl_writes_strict", 1915 .data = &sysctl_writes_strict, 1916 .maxlen = sizeof(int), 1917 .mode = 0644, 1918 .proc_handler = proc_dointvec_minmax, 1919 .extra1 = &neg_one, 1920 .extra2 = SYSCTL_ONE, 1921 }, 1922 #endif 1923 #ifdef CONFIG_LATENCYTOP 1924 { 1925 .procname = "latencytop", 1926 .data = &latencytop_enabled, 1927 .maxlen = sizeof(int), 1928 .mode = 0644, 1929 .proc_handler = sysctl_latencytop, 1930 }, 1931 #endif 1932 #ifdef CONFIG_BLK_DEV_INITRD 1933 { 1934 .procname = "real-root-dev", 1935 .data = &real_root_dev, 1936 .maxlen = sizeof(int), 1937 .mode = 0644, 1938 .proc_handler = proc_dointvec, 1939 }, 1940 #endif 1941 { 1942 .procname = "print-fatal-signals", 1943 .data = &print_fatal_signals, 1944 .maxlen = sizeof(int), 1945 .mode = 0644, 1946 .proc_handler = proc_dointvec, 1947 }, 1948 #ifdef CONFIG_SPARC 1949 { 1950 .procname = "reboot-cmd", 1951 .data = reboot_command, 1952 .maxlen = 256, 1953 .mode = 0644, 1954 .proc_handler = proc_dostring, 1955 }, 1956 { 1957 .procname = "stop-a", 1958 .data = &stop_a_enabled, 1959 .maxlen = sizeof (int), 1960 .mode = 0644, 1961 .proc_handler = proc_dointvec, 1962 }, 1963 { 1964 .procname = "scons-poweroff", 1965 .data = &scons_pwroff, 1966 .maxlen = sizeof (int), 1967 .mode = 0644, 1968 .proc_handler = proc_dointvec, 1969 }, 1970 #endif 1971 #ifdef CONFIG_SPARC64 1972 { 1973 .procname = "tsb-ratio", 1974 .data = &sysctl_tsb_ratio, 1975 .maxlen = sizeof (int), 1976 .mode = 0644, 1977 .proc_handler = proc_dointvec, 1978 }, 1979 #endif 1980 #ifdef CONFIG_PARISC 1981 { 1982 .procname = "soft-power", 1983 .data = &pwrsw_enabled, 1984 .maxlen = sizeof (int), 1985 .mode = 0644, 1986 .proc_handler = proc_dointvec, 1987 }, 1988 #endif 1989 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 1990 { 1991 .procname = "unaligned-trap", 1992 .data = &unaligned_enabled, 1993 .maxlen = sizeof (int), 1994 .mode = 0644, 1995 .proc_handler = proc_dointvec, 1996 }, 1997 #endif 1998 { 1999 .procname = "ctrl-alt-del", 2000 .data = &C_A_D, 2001 .maxlen = sizeof(int), 2002 .mode = 0644, 2003 .proc_handler = proc_dointvec, 2004 }, 2005 #ifdef CONFIG_FUNCTION_TRACER 2006 { 2007 .procname = "ftrace_enabled", 2008 .data = &ftrace_enabled, 2009 .maxlen = sizeof(int), 2010 .mode = 0644, 2011 .proc_handler = ftrace_enable_sysctl, 2012 }, 2013 #endif 2014 #ifdef CONFIG_STACK_TRACER 2015 { 2016 .procname = "stack_tracer_enabled", 2017 .data = &stack_tracer_enabled, 2018 .maxlen = sizeof(int), 2019 .mode = 0644, 2020 .proc_handler = stack_trace_sysctl, 2021 }, 2022 #endif 2023 #ifdef CONFIG_TRACING 2024 { 2025 .procname = "ftrace_dump_on_oops", 2026 .data = &ftrace_dump_on_oops, 2027 .maxlen = sizeof(int), 2028 .mode = 0644, 2029 .proc_handler = proc_dointvec, 2030 }, 2031 { 2032 .procname = "traceoff_on_warning", 2033 .data = &__disable_trace_on_warning, 2034 .maxlen = sizeof(__disable_trace_on_warning), 2035 .mode = 0644, 2036 .proc_handler = proc_dointvec, 2037 }, 2038 { 2039 .procname = "tracepoint_printk", 2040 .data = &tracepoint_printk, 2041 .maxlen = sizeof(tracepoint_printk), 2042 .mode = 0644, 2043 .proc_handler = tracepoint_printk_sysctl, 2044 }, 2045 #endif 2046 #ifdef CONFIG_KEXEC_CORE 2047 { 2048 .procname = "kexec_load_disabled", 2049 .data = &kexec_load_disabled, 2050 .maxlen = sizeof(int), 2051 .mode = 0644, 2052 /* only handle a transition from default "0" to "1" */ 2053 .proc_handler = proc_dointvec_minmax, 2054 .extra1 = SYSCTL_ONE, 2055 .extra2 = SYSCTL_ONE, 2056 }, 2057 #endif 2058 #ifdef CONFIG_MODULES 2059 { 2060 .procname = "modprobe", 2061 .data = &modprobe_path, 2062 .maxlen = KMOD_PATH_LEN, 2063 .mode = 0644, 2064 .proc_handler = proc_dostring, 2065 }, 2066 { 2067 .procname = "modules_disabled", 2068 .data = &modules_disabled, 2069 .maxlen = sizeof(int), 2070 .mode = 0644, 2071 /* only handle a transition from default "0" to "1" */ 2072 .proc_handler = proc_dointvec_minmax, 2073 .extra1 = SYSCTL_ONE, 2074 .extra2 = SYSCTL_ONE, 2075 }, 2076 #endif 2077 #ifdef CONFIG_UEVENT_HELPER 2078 { 2079 .procname = "hotplug", 2080 .data = &uevent_helper, 2081 .maxlen = UEVENT_HELPER_PATH_LEN, 2082 .mode = 0644, 2083 .proc_handler = proc_dostring, 2084 }, 2085 #endif 2086 #ifdef CONFIG_CHR_DEV_SG 2087 { 2088 .procname = "sg-big-buff", 2089 .data = &sg_big_buff, 2090 .maxlen = sizeof (int), 2091 .mode = 0444, 2092 .proc_handler = proc_dointvec, 2093 }, 2094 #endif 2095 #ifdef CONFIG_BSD_PROCESS_ACCT 2096 { 2097 .procname = "acct", 2098 .data = &acct_parm, 2099 .maxlen = 3*sizeof(int), 2100 .mode = 0644, 2101 .proc_handler = proc_dointvec, 2102 }, 2103 #endif 2104 #ifdef CONFIG_MAGIC_SYSRQ 2105 { 2106 .procname = "sysrq", 2107 .data = NULL, 2108 .maxlen = sizeof (int), 2109 .mode = 0644, 2110 .proc_handler = sysrq_sysctl_handler, 2111 }, 2112 #endif 2113 #ifdef CONFIG_PROC_SYSCTL 2114 { 2115 .procname = "cad_pid", 2116 .data = NULL, 2117 .maxlen = sizeof (int), 2118 .mode = 0600, 2119 .proc_handler = proc_do_cad_pid, 2120 }, 2121 #endif 2122 { 2123 .procname = "threads-max", 2124 .data = NULL, 2125 .maxlen = sizeof(int), 2126 .mode = 0644, 2127 .proc_handler = sysctl_max_threads, 2128 }, 2129 { 2130 .procname = "random", 2131 .mode = 0555, 2132 .child = random_table, 2133 }, 2134 { 2135 .procname = "usermodehelper", 2136 .mode = 0555, 2137 .child = usermodehelper_table, 2138 }, 2139 #ifdef CONFIG_FW_LOADER_USER_HELPER 2140 { 2141 .procname = "firmware_config", 2142 .mode = 0555, 2143 .child = firmware_config_table, 2144 }, 2145 #endif 2146 { 2147 .procname = "overflowuid", 2148 .data = &overflowuid, 2149 .maxlen = sizeof(int), 2150 .mode = 0644, 2151 .proc_handler = proc_dointvec_minmax, 2152 .extra1 = &minolduid, 2153 .extra2 = &maxolduid, 2154 }, 2155 { 2156 .procname = "overflowgid", 2157 .data = &overflowgid, 2158 .maxlen = sizeof(int), 2159 .mode = 0644, 2160 .proc_handler = proc_dointvec_minmax, 2161 .extra1 = &minolduid, 2162 .extra2 = &maxolduid, 2163 }, 2164 #ifdef CONFIG_S390 2165 { 2166 .procname = "userprocess_debug", 2167 .data = &show_unhandled_signals, 2168 .maxlen = sizeof(int), 2169 .mode = 0644, 2170 .proc_handler = proc_dointvec, 2171 }, 2172 #endif 2173 #ifdef CONFIG_SMP 2174 { 2175 .procname = "oops_all_cpu_backtrace", 2176 .data = &sysctl_oops_all_cpu_backtrace, 2177 .maxlen = sizeof(int), 2178 .mode = 0644, 2179 .proc_handler = proc_dointvec_minmax, 2180 .extra1 = SYSCTL_ZERO, 2181 .extra2 = SYSCTL_ONE, 2182 }, 2183 #endif /* CONFIG_SMP */ 2184 { 2185 .procname = "pid_max", 2186 .data = &pid_max, 2187 .maxlen = sizeof (int), 2188 .mode = 0644, 2189 .proc_handler = proc_dointvec_minmax, 2190 .extra1 = &pid_max_min, 2191 .extra2 = &pid_max_max, 2192 }, 2193 { 2194 .procname = "panic_on_oops", 2195 .data = &panic_on_oops, 2196 .maxlen = sizeof(int), 2197 .mode = 0644, 2198 .proc_handler = proc_dointvec, 2199 }, 2200 { 2201 .procname = "panic_print", 2202 .data = &panic_print, 2203 .maxlen = sizeof(unsigned long), 2204 .mode = 0644, 2205 .proc_handler = proc_doulongvec_minmax, 2206 }, 2207 #if defined CONFIG_PRINTK 2208 { 2209 .procname = "printk", 2210 .data = &console_loglevel, 2211 .maxlen = 4*sizeof(int), 2212 .mode = 0644, 2213 .proc_handler = proc_dointvec, 2214 }, 2215 { 2216 .procname = "printk_ratelimit", 2217 .data = &printk_ratelimit_state.interval, 2218 .maxlen = sizeof(int), 2219 .mode = 0644, 2220 .proc_handler = proc_dointvec_jiffies, 2221 }, 2222 { 2223 .procname = "printk_ratelimit_burst", 2224 .data = &printk_ratelimit_state.burst, 2225 .maxlen = sizeof(int), 2226 .mode = 0644, 2227 .proc_handler = proc_dointvec, 2228 }, 2229 { 2230 .procname = "printk_delay", 2231 .data = &printk_delay_msec, 2232 .maxlen = sizeof(int), 2233 .mode = 0644, 2234 .proc_handler = proc_dointvec_minmax, 2235 .extra1 = SYSCTL_ZERO, 2236 .extra2 = &ten_thousand, 2237 }, 2238 { 2239 .procname = "printk_devkmsg", 2240 .data = devkmsg_log_str, 2241 .maxlen = DEVKMSG_STR_MAX_SIZE, 2242 .mode = 0644, 2243 .proc_handler = devkmsg_sysctl_set_loglvl, 2244 }, 2245 { 2246 .procname = "dmesg_restrict", 2247 .data = &dmesg_restrict, 2248 .maxlen = sizeof(int), 2249 .mode = 0644, 2250 .proc_handler = proc_dointvec_minmax_sysadmin, 2251 .extra1 = SYSCTL_ZERO, 2252 .extra2 = SYSCTL_ONE, 2253 }, 2254 { 2255 .procname = "kptr_restrict", 2256 .data = &kptr_restrict, 2257 .maxlen = sizeof(int), 2258 .mode = 0644, 2259 .proc_handler = proc_dointvec_minmax_sysadmin, 2260 .extra1 = SYSCTL_ZERO, 2261 .extra2 = &two, 2262 }, 2263 #endif 2264 { 2265 .procname = "ngroups_max", 2266 .data = &ngroups_max, 2267 .maxlen = sizeof (int), 2268 .mode = 0444, 2269 .proc_handler = proc_dointvec, 2270 }, 2271 { 2272 .procname = "cap_last_cap", 2273 .data = (void *)&cap_last_cap, 2274 .maxlen = sizeof(int), 2275 .mode = 0444, 2276 .proc_handler = proc_dointvec, 2277 }, 2278 #if defined(CONFIG_LOCKUP_DETECTOR) 2279 { 2280 .procname = "watchdog", 2281 .data = &watchdog_user_enabled, 2282 .maxlen = sizeof(int), 2283 .mode = 0644, 2284 .proc_handler = proc_watchdog, 2285 .extra1 = SYSCTL_ZERO, 2286 .extra2 = SYSCTL_ONE, 2287 }, 2288 { 2289 .procname = "watchdog_thresh", 2290 .data = &watchdog_thresh, 2291 .maxlen = sizeof(int), 2292 .mode = 0644, 2293 .proc_handler = proc_watchdog_thresh, 2294 .extra1 = SYSCTL_ZERO, 2295 .extra2 = &sixty, 2296 }, 2297 { 2298 .procname = "nmi_watchdog", 2299 .data = &nmi_watchdog_user_enabled, 2300 .maxlen = sizeof(int), 2301 .mode = NMI_WATCHDOG_SYSCTL_PERM, 2302 .proc_handler = proc_nmi_watchdog, 2303 .extra1 = SYSCTL_ZERO, 2304 .extra2 = SYSCTL_ONE, 2305 }, 2306 { 2307 .procname = "watchdog_cpumask", 2308 .data = &watchdog_cpumask_bits, 2309 .maxlen = NR_CPUS, 2310 .mode = 0644, 2311 .proc_handler = proc_watchdog_cpumask, 2312 }, 2313 #ifdef CONFIG_SOFTLOCKUP_DETECTOR 2314 { 2315 .procname = "soft_watchdog", 2316 .data = &soft_watchdog_user_enabled, 2317 .maxlen = sizeof(int), 2318 .mode = 0644, 2319 .proc_handler = proc_soft_watchdog, 2320 .extra1 = SYSCTL_ZERO, 2321 .extra2 = SYSCTL_ONE, 2322 }, 2323 { 2324 .procname = "softlockup_panic", 2325 .data = &softlockup_panic, 2326 .maxlen = sizeof(int), 2327 .mode = 0644, 2328 .proc_handler = proc_dointvec_minmax, 2329 .extra1 = SYSCTL_ZERO, 2330 .extra2 = SYSCTL_ONE, 2331 }, 2332 #ifdef CONFIG_SMP 2333 { 2334 .procname = "softlockup_all_cpu_backtrace", 2335 .data = &sysctl_softlockup_all_cpu_backtrace, 2336 .maxlen = sizeof(int), 2337 .mode = 0644, 2338 .proc_handler = proc_dointvec_minmax, 2339 .extra1 = SYSCTL_ZERO, 2340 .extra2 = SYSCTL_ONE, 2341 }, 2342 #endif /* CONFIG_SMP */ 2343 #endif 2344 #ifdef CONFIG_HARDLOCKUP_DETECTOR 2345 { 2346 .procname = "hardlockup_panic", 2347 .data = &hardlockup_panic, 2348 .maxlen = sizeof(int), 2349 .mode = 0644, 2350 .proc_handler = proc_dointvec_minmax, 2351 .extra1 = SYSCTL_ZERO, 2352 .extra2 = SYSCTL_ONE, 2353 }, 2354 #ifdef CONFIG_SMP 2355 { 2356 .procname = "hardlockup_all_cpu_backtrace", 2357 .data = &sysctl_hardlockup_all_cpu_backtrace, 2358 .maxlen = sizeof(int), 2359 .mode = 0644, 2360 .proc_handler = proc_dointvec_minmax, 2361 .extra1 = SYSCTL_ZERO, 2362 .extra2 = SYSCTL_ONE, 2363 }, 2364 #endif /* CONFIG_SMP */ 2365 #endif 2366 #endif 2367 2368 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 2369 { 2370 .procname = "unknown_nmi_panic", 2371 .data = &unknown_nmi_panic, 2372 .maxlen = sizeof (int), 2373 .mode = 0644, 2374 .proc_handler = proc_dointvec, 2375 }, 2376 #endif 2377 2378 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \ 2379 defined(CONFIG_DEBUG_STACKOVERFLOW) 2380 { 2381 .procname = "panic_on_stackoverflow", 2382 .data = &sysctl_panic_on_stackoverflow, 2383 .maxlen = sizeof(int), 2384 .mode = 0644, 2385 .proc_handler = proc_dointvec, 2386 }, 2387 #endif 2388 #if defined(CONFIG_X86) 2389 { 2390 .procname = "panic_on_unrecovered_nmi", 2391 .data = &panic_on_unrecovered_nmi, 2392 .maxlen = sizeof(int), 2393 .mode = 0644, 2394 .proc_handler = proc_dointvec, 2395 }, 2396 { 2397 .procname = "panic_on_io_nmi", 2398 .data = &panic_on_io_nmi, 2399 .maxlen = sizeof(int), 2400 .mode = 0644, 2401 .proc_handler = proc_dointvec, 2402 }, 2403 { 2404 .procname = "bootloader_type", 2405 .data = &bootloader_type, 2406 .maxlen = sizeof (int), 2407 .mode = 0444, 2408 .proc_handler = proc_dointvec, 2409 }, 2410 { 2411 .procname = "bootloader_version", 2412 .data = &bootloader_version, 2413 .maxlen = sizeof (int), 2414 .mode = 0444, 2415 .proc_handler = proc_dointvec, 2416 }, 2417 { 2418 .procname = "io_delay_type", 2419 .data = &io_delay_type, 2420 .maxlen = sizeof(int), 2421 .mode = 0644, 2422 .proc_handler = proc_dointvec, 2423 }, 2424 #endif 2425 #if defined(CONFIG_MMU) 2426 { 2427 .procname = "randomize_va_space", 2428 .data = &randomize_va_space, 2429 .maxlen = sizeof(int), 2430 .mode = 0644, 2431 .proc_handler = proc_dointvec, 2432 }, 2433 #endif 2434 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 2435 { 2436 .procname = "spin_retry", 2437 .data = &spin_retry, 2438 .maxlen = sizeof (int), 2439 .mode = 0644, 2440 .proc_handler = proc_dointvec, 2441 }, 2442 #endif 2443 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 2444 { 2445 .procname = "acpi_video_flags", 2446 .data = &acpi_realmode_flags, 2447 .maxlen = sizeof (unsigned long), 2448 .mode = 0644, 2449 .proc_handler = proc_doulongvec_minmax, 2450 }, 2451 #endif 2452 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 2453 { 2454 .procname = "ignore-unaligned-usertrap", 2455 .data = &no_unaligned_warning, 2456 .maxlen = sizeof (int), 2457 .mode = 0644, 2458 .proc_handler = proc_dointvec, 2459 }, 2460 #endif 2461 #ifdef CONFIG_IA64 2462 { 2463 .procname = "unaligned-dump-stack", 2464 .data = &unaligned_dump_stack, 2465 .maxlen = sizeof (int), 2466 .mode = 0644, 2467 .proc_handler = proc_dointvec, 2468 }, 2469 #endif 2470 #ifdef CONFIG_DETECT_HUNG_TASK 2471 #ifdef CONFIG_SMP 2472 { 2473 .procname = "hung_task_all_cpu_backtrace", 2474 .data = &sysctl_hung_task_all_cpu_backtrace, 2475 .maxlen = sizeof(int), 2476 .mode = 0644, 2477 .proc_handler = proc_dointvec_minmax, 2478 .extra1 = SYSCTL_ZERO, 2479 .extra2 = SYSCTL_ONE, 2480 }, 2481 #endif /* CONFIG_SMP */ 2482 { 2483 .procname = "hung_task_panic", 2484 .data = &sysctl_hung_task_panic, 2485 .maxlen = sizeof(int), 2486 .mode = 0644, 2487 .proc_handler = proc_dointvec_minmax, 2488 .extra1 = SYSCTL_ZERO, 2489 .extra2 = SYSCTL_ONE, 2490 }, 2491 { 2492 .procname = "hung_task_check_count", 2493 .data = &sysctl_hung_task_check_count, 2494 .maxlen = sizeof(int), 2495 .mode = 0644, 2496 .proc_handler = proc_dointvec_minmax, 2497 .extra1 = SYSCTL_ZERO, 2498 }, 2499 { 2500 .procname = "hung_task_timeout_secs", 2501 .data = &sysctl_hung_task_timeout_secs, 2502 .maxlen = sizeof(unsigned long), 2503 .mode = 0644, 2504 .proc_handler = proc_dohung_task_timeout_secs, 2505 .extra2 = &hung_task_timeout_max, 2506 }, 2507 { 2508 .procname = "hung_task_check_interval_secs", 2509 .data = &sysctl_hung_task_check_interval_secs, 2510 .maxlen = sizeof(unsigned long), 2511 .mode = 0644, 2512 .proc_handler = proc_dohung_task_timeout_secs, 2513 .extra2 = &hung_task_timeout_max, 2514 }, 2515 { 2516 .procname = "hung_task_warnings", 2517 .data = &sysctl_hung_task_warnings, 2518 .maxlen = sizeof(int), 2519 .mode = 0644, 2520 .proc_handler = proc_dointvec_minmax, 2521 .extra1 = &neg_one, 2522 }, 2523 #endif 2524 #ifdef CONFIG_RT_MUTEXES 2525 { 2526 .procname = "max_lock_depth", 2527 .data = &max_lock_depth, 2528 .maxlen = sizeof(int), 2529 .mode = 0644, 2530 .proc_handler = proc_dointvec, 2531 }, 2532 #endif 2533 { 2534 .procname = "poweroff_cmd", 2535 .data = &poweroff_cmd, 2536 .maxlen = POWEROFF_CMD_PATH_LEN, 2537 .mode = 0644, 2538 .proc_handler = proc_dostring, 2539 }, 2540 #ifdef CONFIG_KEYS 2541 { 2542 .procname = "keys", 2543 .mode = 0555, 2544 .child = key_sysctls, 2545 }, 2546 #endif 2547 #ifdef CONFIG_PERF_EVENTS 2548 /* 2549 * User-space scripts rely on the existence of this file 2550 * as a feature check for perf_events being enabled. 2551 * 2552 * So it's an ABI, do not remove! 2553 */ 2554 { 2555 .procname = "perf_event_paranoid", 2556 .data = &sysctl_perf_event_paranoid, 2557 .maxlen = sizeof(sysctl_perf_event_paranoid), 2558 .mode = 0644, 2559 .proc_handler = proc_dointvec, 2560 }, 2561 { 2562 .procname = "perf_event_mlock_kb", 2563 .data = &sysctl_perf_event_mlock, 2564 .maxlen = sizeof(sysctl_perf_event_mlock), 2565 .mode = 0644, 2566 .proc_handler = proc_dointvec, 2567 }, 2568 { 2569 .procname = "perf_event_max_sample_rate", 2570 .data = &sysctl_perf_event_sample_rate, 2571 .maxlen = sizeof(sysctl_perf_event_sample_rate), 2572 .mode = 0644, 2573 .proc_handler = perf_proc_update_handler, 2574 .extra1 = SYSCTL_ONE, 2575 }, 2576 { 2577 .procname = "perf_cpu_time_max_percent", 2578 .data = &sysctl_perf_cpu_time_max_percent, 2579 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 2580 .mode = 0644, 2581 .proc_handler = perf_cpu_time_max_percent_handler, 2582 .extra1 = SYSCTL_ZERO, 2583 .extra2 = &one_hundred, 2584 }, 2585 { 2586 .procname = "perf_event_max_stack", 2587 .data = &sysctl_perf_event_max_stack, 2588 .maxlen = sizeof(sysctl_perf_event_max_stack), 2589 .mode = 0644, 2590 .proc_handler = perf_event_max_stack_handler, 2591 .extra1 = SYSCTL_ZERO, 2592 .extra2 = &six_hundred_forty_kb, 2593 }, 2594 { 2595 .procname = "perf_event_max_contexts_per_stack", 2596 .data = &sysctl_perf_event_max_contexts_per_stack, 2597 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 2598 .mode = 0644, 2599 .proc_handler = perf_event_max_stack_handler, 2600 .extra1 = SYSCTL_ZERO, 2601 .extra2 = &one_thousand, 2602 }, 2603 #endif 2604 { 2605 .procname = "panic_on_warn", 2606 .data = &panic_on_warn, 2607 .maxlen = sizeof(int), 2608 .mode = 0644, 2609 .proc_handler = proc_dointvec_minmax, 2610 .extra1 = SYSCTL_ZERO, 2611 .extra2 = SYSCTL_ONE, 2612 }, 2613 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 2614 { 2615 .procname = "timer_migration", 2616 .data = &sysctl_timer_migration, 2617 .maxlen = sizeof(unsigned int), 2618 .mode = 0644, 2619 .proc_handler = timer_migration_handler, 2620 .extra1 = SYSCTL_ZERO, 2621 .extra2 = SYSCTL_ONE, 2622 }, 2623 #endif 2624 #ifdef CONFIG_BPF_SYSCALL 2625 { 2626 .procname = "unprivileged_bpf_disabled", 2627 .data = &sysctl_unprivileged_bpf_disabled, 2628 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 2629 .mode = 0644, 2630 /* only handle a transition from default "0" to "1" */ 2631 .proc_handler = proc_dointvec_minmax, 2632 .extra1 = SYSCTL_ONE, 2633 .extra2 = SYSCTL_ONE, 2634 }, 2635 { 2636 .procname = "bpf_stats_enabled", 2637 .data = &bpf_stats_enabled_key.key, 2638 .maxlen = sizeof(bpf_stats_enabled_key), 2639 .mode = 0644, 2640 .proc_handler = bpf_stats_handler, 2641 }, 2642 #endif 2643 #if defined(CONFIG_TREE_RCU) 2644 { 2645 .procname = "panic_on_rcu_stall", 2646 .data = &sysctl_panic_on_rcu_stall, 2647 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 2648 .mode = 0644, 2649 .proc_handler = proc_dointvec_minmax, 2650 .extra1 = SYSCTL_ZERO, 2651 .extra2 = SYSCTL_ONE, 2652 }, 2653 #endif 2654 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE 2655 { 2656 .procname = "stack_erasing", 2657 .data = NULL, 2658 .maxlen = sizeof(int), 2659 .mode = 0600, 2660 .proc_handler = stack_erasing_sysctl, 2661 .extra1 = SYSCTL_ZERO, 2662 .extra2 = SYSCTL_ONE, 2663 }, 2664 #endif 2665 { } 2666 }; 2667 2668 static struct ctl_table vm_table[] = { 2669 { 2670 .procname = "overcommit_memory", 2671 .data = &sysctl_overcommit_memory, 2672 .maxlen = sizeof(sysctl_overcommit_memory), 2673 .mode = 0644, 2674 .proc_handler = proc_dointvec_minmax, 2675 .extra1 = SYSCTL_ZERO, 2676 .extra2 = &two, 2677 }, 2678 { 2679 .procname = "panic_on_oom", 2680 .data = &sysctl_panic_on_oom, 2681 .maxlen = sizeof(sysctl_panic_on_oom), 2682 .mode = 0644, 2683 .proc_handler = proc_dointvec_minmax, 2684 .extra1 = SYSCTL_ZERO, 2685 .extra2 = &two, 2686 }, 2687 { 2688 .procname = "oom_kill_allocating_task", 2689 .data = &sysctl_oom_kill_allocating_task, 2690 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 2691 .mode = 0644, 2692 .proc_handler = proc_dointvec, 2693 }, 2694 { 2695 .procname = "oom_dump_tasks", 2696 .data = &sysctl_oom_dump_tasks, 2697 .maxlen = sizeof(sysctl_oom_dump_tasks), 2698 .mode = 0644, 2699 .proc_handler = proc_dointvec, 2700 }, 2701 { 2702 .procname = "overcommit_ratio", 2703 .data = &sysctl_overcommit_ratio, 2704 .maxlen = sizeof(sysctl_overcommit_ratio), 2705 .mode = 0644, 2706 .proc_handler = overcommit_ratio_handler, 2707 }, 2708 { 2709 .procname = "overcommit_kbytes", 2710 .data = &sysctl_overcommit_kbytes, 2711 .maxlen = sizeof(sysctl_overcommit_kbytes), 2712 .mode = 0644, 2713 .proc_handler = overcommit_kbytes_handler, 2714 }, 2715 { 2716 .procname = "page-cluster", 2717 .data = &page_cluster, 2718 .maxlen = sizeof(int), 2719 .mode = 0644, 2720 .proc_handler = proc_dointvec_minmax, 2721 .extra1 = SYSCTL_ZERO, 2722 }, 2723 { 2724 .procname = "dirty_background_ratio", 2725 .data = &dirty_background_ratio, 2726 .maxlen = sizeof(dirty_background_ratio), 2727 .mode = 0644, 2728 .proc_handler = dirty_background_ratio_handler, 2729 .extra1 = SYSCTL_ZERO, 2730 .extra2 = &one_hundred, 2731 }, 2732 { 2733 .procname = "dirty_background_bytes", 2734 .data = &dirty_background_bytes, 2735 .maxlen = sizeof(dirty_background_bytes), 2736 .mode = 0644, 2737 .proc_handler = dirty_background_bytes_handler, 2738 .extra1 = &one_ul, 2739 }, 2740 { 2741 .procname = "dirty_ratio", 2742 .data = &vm_dirty_ratio, 2743 .maxlen = sizeof(vm_dirty_ratio), 2744 .mode = 0644, 2745 .proc_handler = dirty_ratio_handler, 2746 .extra1 = SYSCTL_ZERO, 2747 .extra2 = &one_hundred, 2748 }, 2749 { 2750 .procname = "dirty_bytes", 2751 .data = &vm_dirty_bytes, 2752 .maxlen = sizeof(vm_dirty_bytes), 2753 .mode = 0644, 2754 .proc_handler = dirty_bytes_handler, 2755 .extra1 = &dirty_bytes_min, 2756 }, 2757 { 2758 .procname = "dirty_writeback_centisecs", 2759 .data = &dirty_writeback_interval, 2760 .maxlen = sizeof(dirty_writeback_interval), 2761 .mode = 0644, 2762 .proc_handler = dirty_writeback_centisecs_handler, 2763 }, 2764 { 2765 .procname = "dirty_expire_centisecs", 2766 .data = &dirty_expire_interval, 2767 .maxlen = sizeof(dirty_expire_interval), 2768 .mode = 0644, 2769 .proc_handler = proc_dointvec_minmax, 2770 .extra1 = SYSCTL_ZERO, 2771 }, 2772 { 2773 .procname = "dirtytime_expire_seconds", 2774 .data = &dirtytime_expire_interval, 2775 .maxlen = sizeof(dirtytime_expire_interval), 2776 .mode = 0644, 2777 .proc_handler = dirtytime_interval_handler, 2778 .extra1 = SYSCTL_ZERO, 2779 }, 2780 { 2781 .procname = "swappiness", 2782 .data = &vm_swappiness, 2783 .maxlen = sizeof(vm_swappiness), 2784 .mode = 0644, 2785 .proc_handler = proc_dointvec_minmax, 2786 .extra1 = SYSCTL_ZERO, 2787 .extra2 = &two_hundred, 2788 }, 2789 #ifdef CONFIG_HUGETLB_PAGE 2790 { 2791 .procname = "nr_hugepages", 2792 .data = NULL, 2793 .maxlen = sizeof(unsigned long), 2794 .mode = 0644, 2795 .proc_handler = hugetlb_sysctl_handler, 2796 }, 2797 #ifdef CONFIG_NUMA 2798 { 2799 .procname = "nr_hugepages_mempolicy", 2800 .data = NULL, 2801 .maxlen = sizeof(unsigned long), 2802 .mode = 0644, 2803 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 2804 }, 2805 { 2806 .procname = "numa_stat", 2807 .data = &sysctl_vm_numa_stat, 2808 .maxlen = sizeof(int), 2809 .mode = 0644, 2810 .proc_handler = sysctl_vm_numa_stat_handler, 2811 .extra1 = SYSCTL_ZERO, 2812 .extra2 = SYSCTL_ONE, 2813 }, 2814 #endif 2815 { 2816 .procname = "hugetlb_shm_group", 2817 .data = &sysctl_hugetlb_shm_group, 2818 .maxlen = sizeof(gid_t), 2819 .mode = 0644, 2820 .proc_handler = proc_dointvec, 2821 }, 2822 { 2823 .procname = "nr_overcommit_hugepages", 2824 .data = NULL, 2825 .maxlen = sizeof(unsigned long), 2826 .mode = 0644, 2827 .proc_handler = hugetlb_overcommit_handler, 2828 }, 2829 #endif 2830 { 2831 .procname = "lowmem_reserve_ratio", 2832 .data = &sysctl_lowmem_reserve_ratio, 2833 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 2834 .mode = 0644, 2835 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 2836 }, 2837 { 2838 .procname = "drop_caches", 2839 .data = &sysctl_drop_caches, 2840 .maxlen = sizeof(int), 2841 .mode = 0200, 2842 .proc_handler = drop_caches_sysctl_handler, 2843 .extra1 = SYSCTL_ONE, 2844 .extra2 = &four, 2845 }, 2846 #ifdef CONFIG_COMPACTION 2847 { 2848 .procname = "compact_memory", 2849 .data = &sysctl_compact_memory, 2850 .maxlen = sizeof(int), 2851 .mode = 0200, 2852 .proc_handler = sysctl_compaction_handler, 2853 }, 2854 { 2855 .procname = "extfrag_threshold", 2856 .data = &sysctl_extfrag_threshold, 2857 .maxlen = sizeof(int), 2858 .mode = 0644, 2859 .proc_handler = proc_dointvec_minmax, 2860 .extra1 = &min_extfrag_threshold, 2861 .extra2 = &max_extfrag_threshold, 2862 }, 2863 { 2864 .procname = "compact_unevictable_allowed", 2865 .data = &sysctl_compact_unevictable_allowed, 2866 .maxlen = sizeof(int), 2867 .mode = 0644, 2868 .proc_handler = proc_dointvec_minmax_warn_RT_change, 2869 .extra1 = SYSCTL_ZERO, 2870 .extra2 = SYSCTL_ONE, 2871 }, 2872 2873 #endif /* CONFIG_COMPACTION */ 2874 { 2875 .procname = "min_free_kbytes", 2876 .data = &min_free_kbytes, 2877 .maxlen = sizeof(min_free_kbytes), 2878 .mode = 0644, 2879 .proc_handler = min_free_kbytes_sysctl_handler, 2880 .extra1 = SYSCTL_ZERO, 2881 }, 2882 { 2883 .procname = "watermark_boost_factor", 2884 .data = &watermark_boost_factor, 2885 .maxlen = sizeof(watermark_boost_factor), 2886 .mode = 0644, 2887 .proc_handler = proc_dointvec_minmax, 2888 .extra1 = SYSCTL_ZERO, 2889 }, 2890 { 2891 .procname = "watermark_scale_factor", 2892 .data = &watermark_scale_factor, 2893 .maxlen = sizeof(watermark_scale_factor), 2894 .mode = 0644, 2895 .proc_handler = watermark_scale_factor_sysctl_handler, 2896 .extra1 = SYSCTL_ONE, 2897 .extra2 = &one_thousand, 2898 }, 2899 { 2900 .procname = "percpu_pagelist_fraction", 2901 .data = &percpu_pagelist_fraction, 2902 .maxlen = sizeof(percpu_pagelist_fraction), 2903 .mode = 0644, 2904 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 2905 .extra1 = SYSCTL_ZERO, 2906 }, 2907 #ifdef CONFIG_MMU 2908 { 2909 .procname = "max_map_count", 2910 .data = &sysctl_max_map_count, 2911 .maxlen = sizeof(sysctl_max_map_count), 2912 .mode = 0644, 2913 .proc_handler = proc_dointvec_minmax, 2914 .extra1 = SYSCTL_ZERO, 2915 }, 2916 #else 2917 { 2918 .procname = "nr_trim_pages", 2919 .data = &sysctl_nr_trim_pages, 2920 .maxlen = sizeof(sysctl_nr_trim_pages), 2921 .mode = 0644, 2922 .proc_handler = proc_dointvec_minmax, 2923 .extra1 = SYSCTL_ZERO, 2924 }, 2925 #endif 2926 { 2927 .procname = "laptop_mode", 2928 .data = &laptop_mode, 2929 .maxlen = sizeof(laptop_mode), 2930 .mode = 0644, 2931 .proc_handler = proc_dointvec_jiffies, 2932 }, 2933 { 2934 .procname = "block_dump", 2935 .data = &block_dump, 2936 .maxlen = sizeof(block_dump), 2937 .mode = 0644, 2938 .proc_handler = proc_dointvec, 2939 .extra1 = SYSCTL_ZERO, 2940 }, 2941 { 2942 .procname = "vfs_cache_pressure", 2943 .data = &sysctl_vfs_cache_pressure, 2944 .maxlen = sizeof(sysctl_vfs_cache_pressure), 2945 .mode = 0644, 2946 .proc_handler = proc_dointvec, 2947 .extra1 = SYSCTL_ZERO, 2948 }, 2949 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ 2950 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) 2951 { 2952 .procname = "legacy_va_layout", 2953 .data = &sysctl_legacy_va_layout, 2954 .maxlen = sizeof(sysctl_legacy_va_layout), 2955 .mode = 0644, 2956 .proc_handler = proc_dointvec, 2957 .extra1 = SYSCTL_ZERO, 2958 }, 2959 #endif 2960 #ifdef CONFIG_NUMA 2961 { 2962 .procname = "zone_reclaim_mode", 2963 .data = &node_reclaim_mode, 2964 .maxlen = sizeof(node_reclaim_mode), 2965 .mode = 0644, 2966 .proc_handler = proc_dointvec, 2967 .extra1 = SYSCTL_ZERO, 2968 }, 2969 { 2970 .procname = "min_unmapped_ratio", 2971 .data = &sysctl_min_unmapped_ratio, 2972 .maxlen = sizeof(sysctl_min_unmapped_ratio), 2973 .mode = 0644, 2974 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 2975 .extra1 = SYSCTL_ZERO, 2976 .extra2 = &one_hundred, 2977 }, 2978 { 2979 .procname = "min_slab_ratio", 2980 .data = &sysctl_min_slab_ratio, 2981 .maxlen = sizeof(sysctl_min_slab_ratio), 2982 .mode = 0644, 2983 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 2984 .extra1 = SYSCTL_ZERO, 2985 .extra2 = &one_hundred, 2986 }, 2987 #endif 2988 #ifdef CONFIG_SMP 2989 { 2990 .procname = "stat_interval", 2991 .data = &sysctl_stat_interval, 2992 .maxlen = sizeof(sysctl_stat_interval), 2993 .mode = 0644, 2994 .proc_handler = proc_dointvec_jiffies, 2995 }, 2996 { 2997 .procname = "stat_refresh", 2998 .data = NULL, 2999 .maxlen = 0, 3000 .mode = 0600, 3001 .proc_handler = vmstat_refresh, 3002 }, 3003 #endif 3004 #ifdef CONFIG_MMU 3005 { 3006 .procname = "mmap_min_addr", 3007 .data = &dac_mmap_min_addr, 3008 .maxlen = sizeof(unsigned long), 3009 .mode = 0644, 3010 .proc_handler = mmap_min_addr_handler, 3011 }, 3012 #endif 3013 #ifdef CONFIG_NUMA 3014 { 3015 .procname = "numa_zonelist_order", 3016 .data = &numa_zonelist_order, 3017 .maxlen = NUMA_ZONELIST_ORDER_LEN, 3018 .mode = 0644, 3019 .proc_handler = numa_zonelist_order_handler, 3020 }, 3021 #endif 3022 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 3023 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 3024 { 3025 .procname = "vdso_enabled", 3026 #ifdef CONFIG_X86_32 3027 .data = &vdso32_enabled, 3028 .maxlen = sizeof(vdso32_enabled), 3029 #else 3030 .data = &vdso_enabled, 3031 .maxlen = sizeof(vdso_enabled), 3032 #endif 3033 .mode = 0644, 3034 .proc_handler = proc_dointvec, 3035 .extra1 = SYSCTL_ZERO, 3036 }, 3037 #endif 3038 #ifdef CONFIG_HIGHMEM 3039 { 3040 .procname = "highmem_is_dirtyable", 3041 .data = &vm_highmem_is_dirtyable, 3042 .maxlen = sizeof(vm_highmem_is_dirtyable), 3043 .mode = 0644, 3044 .proc_handler = proc_dointvec_minmax, 3045 .extra1 = SYSCTL_ZERO, 3046 .extra2 = SYSCTL_ONE, 3047 }, 3048 #endif 3049 #ifdef CONFIG_MEMORY_FAILURE 3050 { 3051 .procname = "memory_failure_early_kill", 3052 .data = &sysctl_memory_failure_early_kill, 3053 .maxlen = sizeof(sysctl_memory_failure_early_kill), 3054 .mode = 0644, 3055 .proc_handler = proc_dointvec_minmax, 3056 .extra1 = SYSCTL_ZERO, 3057 .extra2 = SYSCTL_ONE, 3058 }, 3059 { 3060 .procname = "memory_failure_recovery", 3061 .data = &sysctl_memory_failure_recovery, 3062 .maxlen = sizeof(sysctl_memory_failure_recovery), 3063 .mode = 0644, 3064 .proc_handler = proc_dointvec_minmax, 3065 .extra1 = SYSCTL_ZERO, 3066 .extra2 = SYSCTL_ONE, 3067 }, 3068 #endif 3069 { 3070 .procname = "user_reserve_kbytes", 3071 .data = &sysctl_user_reserve_kbytes, 3072 .maxlen = sizeof(sysctl_user_reserve_kbytes), 3073 .mode = 0644, 3074 .proc_handler = proc_doulongvec_minmax, 3075 }, 3076 { 3077 .procname = "admin_reserve_kbytes", 3078 .data = &sysctl_admin_reserve_kbytes, 3079 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 3080 .mode = 0644, 3081 .proc_handler = proc_doulongvec_minmax, 3082 }, 3083 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 3084 { 3085 .procname = "mmap_rnd_bits", 3086 .data = &mmap_rnd_bits, 3087 .maxlen = sizeof(mmap_rnd_bits), 3088 .mode = 0600, 3089 .proc_handler = proc_dointvec_minmax, 3090 .extra1 = (void *)&mmap_rnd_bits_min, 3091 .extra2 = (void *)&mmap_rnd_bits_max, 3092 }, 3093 #endif 3094 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 3095 { 3096 .procname = "mmap_rnd_compat_bits", 3097 .data = &mmap_rnd_compat_bits, 3098 .maxlen = sizeof(mmap_rnd_compat_bits), 3099 .mode = 0600, 3100 .proc_handler = proc_dointvec_minmax, 3101 .extra1 = (void *)&mmap_rnd_compat_bits_min, 3102 .extra2 = (void *)&mmap_rnd_compat_bits_max, 3103 }, 3104 #endif 3105 #ifdef CONFIG_USERFAULTFD 3106 { 3107 .procname = "unprivileged_userfaultfd", 3108 .data = &sysctl_unprivileged_userfaultfd, 3109 .maxlen = sizeof(sysctl_unprivileged_userfaultfd), 3110 .mode = 0644, 3111 .proc_handler = proc_dointvec_minmax, 3112 .extra1 = SYSCTL_ZERO, 3113 .extra2 = SYSCTL_ONE, 3114 }, 3115 #endif 3116 { } 3117 }; 3118 3119 static struct ctl_table fs_table[] = { 3120 { 3121 .procname = "inode-nr", 3122 .data = &inodes_stat, 3123 .maxlen = 2*sizeof(long), 3124 .mode = 0444, 3125 .proc_handler = proc_nr_inodes, 3126 }, 3127 { 3128 .procname = "inode-state", 3129 .data = &inodes_stat, 3130 .maxlen = 7*sizeof(long), 3131 .mode = 0444, 3132 .proc_handler = proc_nr_inodes, 3133 }, 3134 { 3135 .procname = "file-nr", 3136 .data = &files_stat, 3137 .maxlen = sizeof(files_stat), 3138 .mode = 0444, 3139 .proc_handler = proc_nr_files, 3140 }, 3141 { 3142 .procname = "file-max", 3143 .data = &files_stat.max_files, 3144 .maxlen = sizeof(files_stat.max_files), 3145 .mode = 0644, 3146 .proc_handler = proc_doulongvec_minmax, 3147 .extra1 = &zero_ul, 3148 .extra2 = &long_max, 3149 }, 3150 { 3151 .procname = "nr_open", 3152 .data = &sysctl_nr_open, 3153 .maxlen = sizeof(unsigned int), 3154 .mode = 0644, 3155 .proc_handler = proc_dointvec_minmax, 3156 .extra1 = &sysctl_nr_open_min, 3157 .extra2 = &sysctl_nr_open_max, 3158 }, 3159 { 3160 .procname = "dentry-state", 3161 .data = &dentry_stat, 3162 .maxlen = 6*sizeof(long), 3163 .mode = 0444, 3164 .proc_handler = proc_nr_dentry, 3165 }, 3166 { 3167 .procname = "overflowuid", 3168 .data = &fs_overflowuid, 3169 .maxlen = sizeof(int), 3170 .mode = 0644, 3171 .proc_handler = proc_dointvec_minmax, 3172 .extra1 = &minolduid, 3173 .extra2 = &maxolduid, 3174 }, 3175 { 3176 .procname = "overflowgid", 3177 .data = &fs_overflowgid, 3178 .maxlen = sizeof(int), 3179 .mode = 0644, 3180 .proc_handler = proc_dointvec_minmax, 3181 .extra1 = &minolduid, 3182 .extra2 = &maxolduid, 3183 }, 3184 #ifdef CONFIG_FILE_LOCKING 3185 { 3186 .procname = "leases-enable", 3187 .data = &leases_enable, 3188 .maxlen = sizeof(int), 3189 .mode = 0644, 3190 .proc_handler = proc_dointvec, 3191 }, 3192 #endif 3193 #ifdef CONFIG_DNOTIFY 3194 { 3195 .procname = "dir-notify-enable", 3196 .data = &dir_notify_enable, 3197 .maxlen = sizeof(int), 3198 .mode = 0644, 3199 .proc_handler = proc_dointvec, 3200 }, 3201 #endif 3202 #ifdef CONFIG_MMU 3203 #ifdef CONFIG_FILE_LOCKING 3204 { 3205 .procname = "lease-break-time", 3206 .data = &lease_break_time, 3207 .maxlen = sizeof(int), 3208 .mode = 0644, 3209 .proc_handler = proc_dointvec, 3210 }, 3211 #endif 3212 #ifdef CONFIG_AIO 3213 { 3214 .procname = "aio-nr", 3215 .data = &aio_nr, 3216 .maxlen = sizeof(aio_nr), 3217 .mode = 0444, 3218 .proc_handler = proc_doulongvec_minmax, 3219 }, 3220 { 3221 .procname = "aio-max-nr", 3222 .data = &aio_max_nr, 3223 .maxlen = sizeof(aio_max_nr), 3224 .mode = 0644, 3225 .proc_handler = proc_doulongvec_minmax, 3226 }, 3227 #endif /* CONFIG_AIO */ 3228 #ifdef CONFIG_INOTIFY_USER 3229 { 3230 .procname = "inotify", 3231 .mode = 0555, 3232 .child = inotify_table, 3233 }, 3234 #endif 3235 #ifdef CONFIG_EPOLL 3236 { 3237 .procname = "epoll", 3238 .mode = 0555, 3239 .child = epoll_table, 3240 }, 3241 #endif 3242 #endif 3243 { 3244 .procname = "protected_symlinks", 3245 .data = &sysctl_protected_symlinks, 3246 .maxlen = sizeof(int), 3247 .mode = 0600, 3248 .proc_handler = proc_dointvec_minmax, 3249 .extra1 = SYSCTL_ZERO, 3250 .extra2 = SYSCTL_ONE, 3251 }, 3252 { 3253 .procname = "protected_hardlinks", 3254 .data = &sysctl_protected_hardlinks, 3255 .maxlen = sizeof(int), 3256 .mode = 0600, 3257 .proc_handler = proc_dointvec_minmax, 3258 .extra1 = SYSCTL_ZERO, 3259 .extra2 = SYSCTL_ONE, 3260 }, 3261 { 3262 .procname = "protected_fifos", 3263 .data = &sysctl_protected_fifos, 3264 .maxlen = sizeof(int), 3265 .mode = 0600, 3266 .proc_handler = proc_dointvec_minmax, 3267 .extra1 = SYSCTL_ZERO, 3268 .extra2 = &two, 3269 }, 3270 { 3271 .procname = "protected_regular", 3272 .data = &sysctl_protected_regular, 3273 .maxlen = sizeof(int), 3274 .mode = 0600, 3275 .proc_handler = proc_dointvec_minmax, 3276 .extra1 = SYSCTL_ZERO, 3277 .extra2 = &two, 3278 }, 3279 { 3280 .procname = "suid_dumpable", 3281 .data = &suid_dumpable, 3282 .maxlen = sizeof(int), 3283 .mode = 0644, 3284 .proc_handler = proc_dointvec_minmax_coredump, 3285 .extra1 = SYSCTL_ZERO, 3286 .extra2 = &two, 3287 }, 3288 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 3289 { 3290 .procname = "binfmt_misc", 3291 .mode = 0555, 3292 .child = sysctl_mount_point, 3293 }, 3294 #endif 3295 { 3296 .procname = "pipe-max-size", 3297 .data = &pipe_max_size, 3298 .maxlen = sizeof(pipe_max_size), 3299 .mode = 0644, 3300 .proc_handler = proc_dopipe_max_size, 3301 }, 3302 { 3303 .procname = "pipe-user-pages-hard", 3304 .data = &pipe_user_pages_hard, 3305 .maxlen = sizeof(pipe_user_pages_hard), 3306 .mode = 0644, 3307 .proc_handler = proc_doulongvec_minmax, 3308 }, 3309 { 3310 .procname = "pipe-user-pages-soft", 3311 .data = &pipe_user_pages_soft, 3312 .maxlen = sizeof(pipe_user_pages_soft), 3313 .mode = 0644, 3314 .proc_handler = proc_doulongvec_minmax, 3315 }, 3316 { 3317 .procname = "mount-max", 3318 .data = &sysctl_mount_max, 3319 .maxlen = sizeof(unsigned int), 3320 .mode = 0644, 3321 .proc_handler = proc_dointvec_minmax, 3322 .extra1 = SYSCTL_ONE, 3323 }, 3324 { } 3325 }; 3326 3327 static struct ctl_table debug_table[] = { 3328 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 3329 { 3330 .procname = "exception-trace", 3331 .data = &show_unhandled_signals, 3332 .maxlen = sizeof(int), 3333 .mode = 0644, 3334 .proc_handler = proc_dointvec 3335 }, 3336 #endif 3337 #if defined(CONFIG_OPTPROBES) 3338 { 3339 .procname = "kprobes-optimization", 3340 .data = &sysctl_kprobes_optimization, 3341 .maxlen = sizeof(int), 3342 .mode = 0644, 3343 .proc_handler = proc_kprobes_optimization_handler, 3344 .extra1 = SYSCTL_ZERO, 3345 .extra2 = SYSCTL_ONE, 3346 }, 3347 #endif 3348 { } 3349 }; 3350 3351 static struct ctl_table dev_table[] = { 3352 { } 3353 }; 3354 3355 static struct ctl_table sysctl_base_table[] = { 3356 { 3357 .procname = "kernel", 3358 .mode = 0555, 3359 .child = kern_table, 3360 }, 3361 { 3362 .procname = "vm", 3363 .mode = 0555, 3364 .child = vm_table, 3365 }, 3366 { 3367 .procname = "fs", 3368 .mode = 0555, 3369 .child = fs_table, 3370 }, 3371 { 3372 .procname = "debug", 3373 .mode = 0555, 3374 .child = debug_table, 3375 }, 3376 { 3377 .procname = "dev", 3378 .mode = 0555, 3379 .child = dev_table, 3380 }, 3381 { } 3382 }; 3383 3384 int __init sysctl_init(void) 3385 { 3386 struct ctl_table_header *hdr; 3387 3388 hdr = register_sysctl_table(sysctl_base_table); 3389 kmemleak_not_leak(hdr); 3390 return 0; 3391 } 3392 #endif /* CONFIG_SYSCTL */ 3393 /* 3394 * No sense putting this after each symbol definition, twice, 3395 * exception granted :-) 3396 */ 3397 EXPORT_SYMBOL(proc_dointvec); 3398 EXPORT_SYMBOL(proc_douintvec); 3399 EXPORT_SYMBOL(proc_dointvec_jiffies); 3400 EXPORT_SYMBOL(proc_dointvec_minmax); 3401 EXPORT_SYMBOL_GPL(proc_douintvec_minmax); 3402 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3403 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3404 EXPORT_SYMBOL(proc_dostring); 3405 EXPORT_SYMBOL(proc_doulongvec_minmax); 3406 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3407 EXPORT_SYMBOL(proc_do_large_bitmap); 3408