kernel/sysctl.c

   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 #ifdef CONFIG_FANOTIFY
 152 #include <linux/fanotify.h>
 153 #endif
 154
 155 #ifdef CONFIG_PROC_SYSCTL
 156
 157 /**
 158  * enum sysctl_writes_mode - supported sysctl write modes
 159  *
 160  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 161  *      to be written, and multiple writes on the same sysctl file descriptor
 162  *      will rewrite the sysctl value, regardless of file position. No warning
 163  *      is issued when the initial position is not 0.
 164  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 165  *      not 0.
 166  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 167  *      file position 0 and the value must be fully contained in the buffer
 168  *      sent to the write syscall. If dealing with strings respect the file
 169  *      position, but restrict this to the max length of the buffer, anything
 170  *      passed the max length will be ignored. Multiple writes will append
 171  *      to the buffer.
 172  *
 173  * These write modes control how current file position affects the behavior of
 174  * updating sysctl values through the proc interface on each write.
 175  */
 176 enum sysctl_writes_mode {
 177         SYSCTL_WRITES_LEGACY            = -1,
 178         SYSCTL_WRITES_WARN              = 0,
 179         SYSCTL_WRITES_STRICT            = 1,
 180 };
 181
 182 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 183 #endif /* CONFIG_PROC_SYSCTL */
 184
 185 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
 186     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
 187 int sysctl_legacy_va_layout;
 188 #endif
 189
 190 #ifdef CONFIG_COMPACTION
 191 static int min_extfrag_threshold;
 192 static int max_extfrag_threshold = 1000;
 193 #endif
 194
 195 #endif /* CONFIG_SYSCTL */
 196
 197 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
 198 static int bpf_stats_handler(struct ctl_table *table, int write,
 199                              void *buffer, size_t *lenp, loff_t *ppos)
 200 {
 201         struct static_key *key = (struct static_key *)table->data;
 202         static int saved_val;
 203         int val, ret;
 204         struct ctl_table tmp = {
 205                 .data   = &val,
 206                 .maxlen = sizeof(val),
 207                 .mode   = table->mode,
 208                 .extra1 = SYSCTL_ZERO,
 209                 .extra2 = SYSCTL_ONE,
 210         };
 211
 212         if (write && !capable(CAP_SYS_ADMIN))
 213                 return -EPERM;
 214
 215         mutex_lock(&bpf_stats_enabled_mutex);
 216         val = saved_val;
 217         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 218         if (write && !ret && val != saved_val) {
 219                 if (val)
 220                         static_key_slow_inc(key);
 221                 else
 222                         static_key_slow_dec(key);
 223                 saved_val = val;
 224         }
 225         mutex_unlock(&bpf_stats_enabled_mutex);
 226         return ret;
 227 }
 228 #endif
 229
 230 /*
 231  * /proc/sys support
 232  */
 233
 234 #ifdef CONFIG_PROC_SYSCTL
 235
 236 static int _proc_do_string(char *data, int maxlen, int write,
 237                 char *buffer, size_t *lenp, loff_t *ppos)
 238 {
 239         size_t len;
 240         char c, *p;
 241
 242         if (!data || !maxlen || !*lenp) {
 243                 *lenp = 0;
 244                 return 0;
 245         }
 246
 247         if (write) {
 248                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
 249                         /* Only continue writes not past the end of buffer. */
 250                         len = strlen(data);
 251                         if (len > maxlen - 1)
 252                                 len = maxlen - 1;
 253
 254                         if (*ppos > len)
 255                                 return 0;
 256                         len = *ppos;
 257                 } else {
 258                         /* Start writing from beginning of buffer. */
 259                         len = 0;
 260                 }
 261
 262                 *ppos += *lenp;
 263                 p = buffer;
 264                 while ((p - buffer) < *lenp && len < maxlen - 1) {
 265                         c = *(p++);
 266                         if (c == 0 || c == '\n')
 267                                 break;
 268                         data[len++] = c;
 269                 }
 270                 data[len] = 0;
 271         } else {
 272                 len = strlen(data);
 273                 if (len > maxlen)
 274                         len = maxlen;
 275
 276                 if (*ppos > len) {
 277                         *lenp = 0;
 278                         return 0;
 279                 }
 280
 281                 data += *ppos;
 282                 len  -= *ppos;
 283
 284                 if (len > *lenp)
 285                         len = *lenp;
 286                 if (len)
 287                         memcpy(buffer, data, len);
 288                 if (len < *lenp) {
 289                         buffer[len] = '\n';
 290                         len++;
 291                 }
 292                 *lenp = len;
 293                 *ppos += len;
 294         }
 295         return 0;
 296 }
 297
 298 static void warn_sysctl_write(struct ctl_table *table)
 299 {
 300         pr_warn_once("%s wrote to %s when file position was not 0!\n"
 301                 "This will not be supported in the future. To silence this\n"
 302                 "warning, set kernel.sysctl_writes_strict = -1\n",
 303                 current->comm, table->procname);
 304 }
 305
 306 /**
 307  * proc_first_pos_non_zero_ignore - check if first position is allowed
 308  * @ppos: file position
 309  * @table: the sysctl table
 310  *
 311  * Returns true if the first position is non-zero and the sysctl_writes_strict
 312  * mode indicates this is not allowed for numeric input types. String proc
 313  * handlers can ignore the return value.
 314  */
 315 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
 316                                            struct ctl_table *table)
 317 {
 318         if (!*ppos)
 319                 return false;
 320
 321         switch (sysctl_writes_strict) {
 322         case SYSCTL_WRITES_STRICT:
 323                 return true;
 324         case SYSCTL_WRITES_WARN:
 325                 warn_sysctl_write(table);
 326                 return false;
 327         default:
 328                 return false;
 329         }
 330 }
 331
 332 /**
 333  * proc_dostring - read a string sysctl
 334  * @table: the sysctl table
 335  * @write: %TRUE if this is a write to the sysctl file
 336  * @buffer: the user buffer
 337  * @lenp: the size of the user buffer
 338  * @ppos: file position
 339  *
 340  * Reads/writes a string from/to the user buffer. If the kernel
 341  * buffer provided is not large enough to hold the string, the
 342  * string is truncated. The copied string is %NULL-terminated.
 343  * If the string is being read by the user process, it is copied
 344  * and a newline '\n' is added. It is truncated if the buffer is
 345  * not large enough.
 346  *
 347  * Returns 0 on success.
 348  */
 349 int proc_dostring(struct ctl_table *table, int write,
 350                   void *buffer, size_t *lenp, loff_t *ppos)
 351 {
 352         if (write)
 353                 proc_first_pos_non_zero_ignore(ppos, table);
 354
 355         return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
 356                         ppos);
 357 }
 358
 359 static size_t proc_skip_spaces(char **buf)
 360 {
 361         size_t ret;
 362         char *tmp = skip_spaces(*buf);
 363         ret = tmp - *buf;
 364         *buf = tmp;
 365         return ret;
 366 }
 367
 368 static void proc_skip_char(char **buf, size_t *size, const char v)
 369 {
 370         while (*size) {
 371                 if (**buf != v)
 372                         break;
 373                 (*size)--;
 374                 (*buf)++;
 375         }
 376 }
 377
 378 /**
 379  * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
 380  *                   fail on overflow
 381  *
 382  * @cp: kernel buffer containing the string to parse
 383  * @endp: pointer to store the trailing characters
 384  * @base: the base to use
 385  * @res: where the parsed integer will be stored
 386  *
 387  * In case of success 0 is returned and @res will contain the parsed integer,
 388  * @endp will hold any trailing characters.
 389  * This function will fail the parse on overflow. If there wasn't an overflow
 390  * the function will defer the decision what characters count as invalid to the
 391  * caller.
 392  */
 393 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
 394                            unsigned long *res)
 395 {
 396         unsigned long long result;
 397         unsigned int rv;
 398
 399         cp = _parse_integer_fixup_radix(cp, &base);
 400         rv = _parse_integer(cp, base, &result);
 401         if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
 402                 return -ERANGE;
 403
 404         cp += rv;
 405
 406         if (endp)
 407                 *endp = (char *)cp;
 408
 409         *res = (unsigned long)result;
 410         return 0;
 411 }
 412
 413 #define TMPBUFLEN 22
 414 /**
 415  * proc_get_long - reads an ASCII formatted integer from a user buffer
 416  *
 417  * @buf: a kernel buffer
 418  * @size: size of the kernel buffer
 419  * @val: this is where the number will be stored
 420  * @neg: set to %TRUE if number is negative
 421  * @perm_tr: a vector which contains the allowed trailers
 422  * @perm_tr_len: size of the perm_tr vector
 423  * @tr: pointer to store the trailer character
 424  *
 425  * In case of success %0 is returned and @buf and @size are updated with
 426  * the amount of bytes read. If @tr is non-NULL and a trailing
 427  * character exists (size is non-zero after returning from this
 428  * function), @tr is updated with the trailing character.
 429  */
 430 static int proc_get_long(char **buf, size_t *size,
 431                           unsigned long *val, bool *neg,
 432                           const char *perm_tr, unsigned perm_tr_len, char *tr)
 433 {
 434         int len;
 435         char *p, tmp[TMPBUFLEN];
 436
 437         if (!*size)
 438                 return -EINVAL;
 439
 440         len = *size;
 441         if (len > TMPBUFLEN - 1)
 442                 len = TMPBUFLEN - 1;
 443
 444         memcpy(tmp, *buf, len);
 445
 446         tmp[len] = 0;
 447         p = tmp;
 448         if (*p == '-' && *size > 1) {
 449                 *neg = true;
 450                 p++;
 451         } else
 452                 *neg = false;
 453         if (!isdigit(*p))
 454                 return -EINVAL;
 455
 456         if (strtoul_lenient(p, &p, 0, val))
 457                 return -EINVAL;
 458
 459         len = p - tmp;
 460
 461         /* We don't know if the next char is whitespace thus we may accept
 462          * invalid integers (e.g. 1234...a) or two integers instead of one
 463          * (e.g. 123...1). So lets not allow such large numbers. */
 464         if (len == TMPBUFLEN - 1)
 465                 return -EINVAL;
 466
 467         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
 468                 return -EINVAL;
 469
 470         if (tr && (len < *size))
 471                 *tr = *p;
 472
 473         *buf += len;
 474         *size -= len;
 475
 476         return 0;
 477 }
 478
 479 /**
 480  * proc_put_long - converts an integer to a decimal ASCII formatted string
 481  *
 482  * @buf: the user buffer
 483  * @size: the size of the user buffer
 484  * @val: the integer to be converted
 485  * @neg: sign of the number, %TRUE for negative
 486  *
 487  * In case of success @buf and @size are updated with the amount of bytes
 488  * written.
 489  */
 490 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
 491 {
 492         int len;
 493         char tmp[TMPBUFLEN], *p = tmp;
 494
 495         sprintf(p, "%s%lu", neg ? "-" : "", val);
 496         len = strlen(tmp);
 497         if (len > *size)
 498                 len = *size;
 499         memcpy(*buf, tmp, len);
 500         *size -= len;
 501         *buf += len;
 502 }
 503 #undef TMPBUFLEN
 504
 505 static void proc_put_char(void **buf, size_t *size, char c)
 506 {
 507         if (*size) {
 508                 char **buffer = (char **)buf;
 509                 **buffer = c;
 510
 511                 (*size)--;
 512                 (*buffer)++;
 513                 *buf = *buffer;
 514         }
 515 }
 516
 517 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
 518                                  int *valp,
 519                                  int write, void *data)
 520 {
 521         if (write) {
 522                 if (*negp) {
 523                         if (*lvalp > (unsigned long) INT_MAX + 1)
 524                                 return -EINVAL;
 525                         *valp = -*lvalp;
 526                 } else {
 527                         if (*lvalp > (unsigned long) INT_MAX)
 528                                 return -EINVAL;
 529                         *valp = *lvalp;
 530                 }
 531         } else {
 532                 int val = *valp;
 533                 if (val < 0) {
 534                         *negp = true;
 535                         *lvalp = -(unsigned long)val;
 536                 } else {
 537                         *negp = false;
 538                         *lvalp = (unsigned long)val;
 539                 }
 540         }
 541         return 0;
 542 }
 543
 544 static int do_proc_douintvec_conv(unsigned long *lvalp,
 545                                   unsigned int *valp,
 546                                   int write, void *data)
 547 {
 548         if (write) {
 549                 if (*lvalp > UINT_MAX)
 550                         return -EINVAL;
 551                 *valp = *lvalp;
 552         } else {
 553                 unsigned int val = *valp;
 554                 *lvalp = (unsigned long)val;
 555         }
 556         return 0;
 557 }
 558
 559 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
 560
 561 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
 562                   int write, void *buffer,
 563                   size_t *lenp, loff_t *ppos,
 564                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 565                               int write, void *data),
 566                   void *data)
 567 {
 568         int *i, vleft, first = 1, err = 0;
 569         size_t left;
 570         char *p;
 571
 572         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 573                 *lenp = 0;
 574                 return 0;
 575         }
 576
 577         i = (int *) tbl_data;
 578         vleft = table->maxlen / sizeof(*i);
 579         left = *lenp;
 580
 581         if (!conv)
 582                 conv = do_proc_dointvec_conv;
 583
 584         if (write) {
 585                 if (proc_first_pos_non_zero_ignore(ppos, table))
 586                         goto out;
 587
 588                 if (left > PAGE_SIZE - 1)
 589                         left = PAGE_SIZE - 1;
 590                 p = buffer;
 591         }
 592
 593         for (; left && vleft--; i++, first=0) {
 594                 unsigned long lval;
 595                 bool neg;
 596
 597                 if (write) {
 598                         left -= proc_skip_spaces(&p);
 599
 600                         if (!left)
 601                                 break;
 602                         err = proc_get_long(&p, &left, &lval, &neg,
 603                                              proc_wspace_sep,
 604                                              sizeof(proc_wspace_sep), NULL);
 605                         if (err)
 606                                 break;
 607                         if (conv(&neg, &lval, i, 1, data)) {
 608                                 err = -EINVAL;
 609                                 break;
 610                         }
 611                 } else {
 612                         if (conv(&neg, &lval, i, 0, data)) {
 613                                 err = -EINVAL;
 614                                 break;
 615                         }
 616                         if (!first)
 617                                 proc_put_char(&buffer, &left, '\t');
 618                         proc_put_long(&buffer, &left, lval, neg);
 619                 }
 620         }
 621
 622         if (!write && !first && left && !err)
 623                 proc_put_char(&buffer, &left, '\n');
 624         if (write && !err && left)
 625                 left -= proc_skip_spaces(&p);
 626         if (write && first)
 627                 return err ? : -EINVAL;
 628         *lenp -= left;
 629 out:
 630         *ppos += *lenp;
 631         return err;
 632 }
 633
 634 static int do_proc_dointvec(struct ctl_table *table, int write,
 635                   void *buffer, size_t *lenp, loff_t *ppos,
 636                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 637                               int write, void *data),
 638                   void *data)
 639 {
 640         return __do_proc_dointvec(table->data, table, write,
 641                         buffer, lenp, ppos, conv, data);
 642 }
 643
 644 static int do_proc_douintvec_w(unsigned int *tbl_data,
 645                                struct ctl_table *table,
 646                                void *buffer,
 647                                size_t *lenp, loff_t *ppos,
 648                                int (*conv)(unsigned long *lvalp,
 649                                            unsigned int *valp,
 650                                            int write, void *data),
 651                                void *data)
 652 {
 653         unsigned long lval;
 654         int err = 0;
 655         size_t left;
 656         bool neg;
 657         char *p = buffer;
 658
 659         left = *lenp;
 660
 661         if (proc_first_pos_non_zero_ignore(ppos, table))
 662                 goto bail_early;
 663
 664         if (left > PAGE_SIZE - 1)
 665                 left = PAGE_SIZE - 1;
 666
 667         left -= proc_skip_spaces(&p);
 668         if (!left) {
 669                 err = -EINVAL;
 670                 goto out_free;
 671         }
 672
 673         err = proc_get_long(&p, &left, &lval, &neg,
 674                              proc_wspace_sep,
 675                              sizeof(proc_wspace_sep), NULL);
 676         if (err || neg) {
 677                 err = -EINVAL;
 678                 goto out_free;
 679         }
 680
 681         if (conv(&lval, tbl_data, 1, data)) {
 682                 err = -EINVAL;
 683                 goto out_free;
 684         }
 685
 686         if (!err && left)
 687                 left -= proc_skip_spaces(&p);
 688
 689 out_free:
 690         if (err)
 691                 return -EINVAL;
 692
 693         return 0;
 694
 695         /* This is in keeping with old __do_proc_dointvec() */
 696 bail_early:
 697         *ppos += *lenp;
 698         return err;
 699 }
 700
 701 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
 702                                size_t *lenp, loff_t *ppos,
 703                                int (*conv)(unsigned long *lvalp,
 704                                            unsigned int *valp,
 705                                            int write, void *data),
 706                                void *data)
 707 {
 708         unsigned long lval;
 709         int err = 0;
 710         size_t left;
 711
 712         left = *lenp;
 713
 714         if (conv(&lval, tbl_data, 0, data)) {
 715                 err = -EINVAL;
 716                 goto out;
 717         }
 718
 719         proc_put_long(&buffer, &left, lval, false);
 720         if (!left)
 721                 goto out;
 722
 723         proc_put_char(&buffer, &left, '\n');
 724
 725 out:
 726         *lenp -= left;
 727         *ppos += *lenp;
 728
 729         return err;
 730 }
 731
 732 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
 733                                int write, void *buffer,
 734                                size_t *lenp, loff_t *ppos,
 735                                int (*conv)(unsigned long *lvalp,
 736                                            unsigned int *valp,
 737                                            int write, void *data),
 738                                void *data)
 739 {
 740         unsigned int *i, vleft;
 741
 742         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 743                 *lenp = 0;
 744                 return 0;
 745         }
 746
 747         i = (unsigned int *) tbl_data;
 748         vleft = table->maxlen / sizeof(*i);
 749
 750         /*
 751          * Arrays are not supported, keep this simple. *Do not* add
 752          * support for them.
 753          */
 754         if (vleft != 1) {
 755                 *lenp = 0;
 756                 return -EINVAL;
 757         }
 758
 759         if (!conv)
 760                 conv = do_proc_douintvec_conv;
 761
 762         if (write)
 763                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
 764                                            conv, data);
 765         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
 766 }
 767
 768 static int do_proc_douintvec(struct ctl_table *table, int write,
 769                              void *buffer, size_t *lenp, loff_t *ppos,
 770                              int (*conv)(unsigned long *lvalp,
 771                                          unsigned int *valp,
 772                                          int write, void *data),
 773                              void *data)
 774 {
 775         return __do_proc_douintvec(table->data, table, write,
 776                                    buffer, lenp, ppos, conv, data);
 777 }
 778
 779 /**
 780  * proc_dointvec - read a vector of integers
 781  * @table: the sysctl table
 782  * @write: %TRUE if this is a write to the sysctl file
 783  * @buffer: the user buffer
 784  * @lenp: the size of the user buffer
 785  * @ppos: file position
 786  *
 787  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 788  * values from/to the user buffer, treated as an ASCII string.
 789  *
 790  * Returns 0 on success.
 791  */
 792 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
 793                   size_t *lenp, loff_t *ppos)
 794 {
 795         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
 796 }
 797
 798 #ifdef CONFIG_COMPACTION
 799 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
 800                 int write, void *buffer, size_t *lenp, loff_t *ppos)
 801 {
 802         int ret, old;
 803
 804         if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
 805                 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 806
 807         old = *(int *)table->data;
 808         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 809         if (ret)
 810                 return ret;
 811         if (old != *(int *)table->data)
 812                 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
 813                              table->procname, current->comm,
 814                              task_pid_nr(current));
 815         return ret;
 816 }
 817 #endif
 818
 819 /**
 820  * proc_douintvec - read a vector of unsigned integers
 821  * @table: the sysctl table
 822  * @write: %TRUE if this is a write to the sysctl file
 823  * @buffer: the user buffer
 824  * @lenp: the size of the user buffer
 825  * @ppos: file position
 826  *
 827  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
 828  * values from/to the user buffer, treated as an ASCII string.
 829  *
 830  * Returns 0 on success.
 831  */
 832 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
 833                 size_t *lenp, loff_t *ppos)
 834 {
 835         return do_proc_douintvec(table, write, buffer, lenp, ppos,
 836                                  do_proc_douintvec_conv, NULL);
 837 }
 838
 839 /*
 840  * Taint values can only be increased
 841  * This means we can safely use a temporary.
 842  */
 843 static int proc_taint(struct ctl_table *table, int write,
 844                                void *buffer, size_t *lenp, loff_t *ppos)
 845 {
 846         struct ctl_table t;
 847         unsigned long tmptaint = get_taint();
 848         int err;
 849
 850         if (write && !capable(CAP_SYS_ADMIN))
 851                 return -EPERM;
 852
 853         t = *table;
 854         t.data = &tmptaint;
 855         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
 856         if (err < 0)
 857                 return err;
 858
 859         if (write) {
 860                 int i;
 861
 862                 /*
 863                  * If we are relying on panic_on_taint not producing
 864                  * false positives due to userspace input, bail out
 865                  * before setting the requested taint flags.
 866                  */
 867                 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
 868                         return -EINVAL;
 869
 870                 /*
 871                  * Poor man's atomic or. Not worth adding a primitive
 872                  * to everyone's atomic.h for this
 873                  */
 874                 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
 875                         if ((1UL << i) & tmptaint)
 876                                 add_taint(i, LOCKDEP_STILL_OK);
 877         }
 878
 879         return err;
 880 }
 881
 882 #ifdef CONFIG_PRINTK
 883 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 884                                 void *buffer, size_t *lenp, loff_t *ppos)
 885 {
 886         if (write && !capable(CAP_SYS_ADMIN))
 887                 return -EPERM;
 888
 889         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 890 }
 891 #endif
 892
 893 /**
 894  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
 895  * @min: pointer to minimum allowable value
 896  * @max: pointer to maximum allowable value
 897  *
 898  * The do_proc_dointvec_minmax_conv_param structure provides the
 899  * minimum and maximum values for doing range checking for those sysctl
 900  * parameters that use the proc_dointvec_minmax() handler.
 901  */
 902 struct do_proc_dointvec_minmax_conv_param {
 903         int *min;
 904         int *max;
 905 };
 906
 907 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
 908                                         int *valp,
 909                                         int write, void *data)
 910 {
 911         int tmp, ret;
 912         struct do_proc_dointvec_minmax_conv_param *param = data;
 913         /*
 914          * If writing, first do so via a temporary local int so we can
 915          * bounds-check it before touching *valp.
 916          */
 917         int *ip = write ? &tmp : valp;
 918
 919         ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
 920         if (ret)
 921                 return ret;
 922
 923         if (write) {
 924                 if ((param->min && *param->min > tmp) ||
 925                     (param->max && *param->max < tmp))
 926                         return -EINVAL;
 927                 *valp = tmp;
 928         }
 929
 930         return 0;
 931 }
 932
 933 /**
 934  * proc_dointvec_minmax - read a vector of integers with min/max values
 935  * @table: the sysctl table
 936  * @write: %TRUE if this is a write to the sysctl file
 937  * @buffer: the user buffer
 938  * @lenp: the size of the user buffer
 939  * @ppos: file position
 940  *
 941  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 942  * values from/to the user buffer, treated as an ASCII string.
 943  *
 944  * This routine will ensure the values are within the range specified by
 945  * table->extra1 (min) and table->extra2 (max).
 946  *
 947  * Returns 0 on success or -EINVAL on write when the range check fails.
 948  */
 949 int proc_dointvec_minmax(struct ctl_table *table, int write,
 950                   void *buffer, size_t *lenp, loff_t *ppos)
 951 {
 952         struct do_proc_dointvec_minmax_conv_param param = {
 953                 .min = (int *) table->extra1,
 954                 .max = (int *) table->extra2,
 955         };
 956         return do_proc_dointvec(table, write, buffer, lenp, ppos,
 957                                 do_proc_dointvec_minmax_conv, &param);
 958 }
 959
 960 /**
 961  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
 962  * @min: pointer to minimum allowable value
 963  * @max: pointer to maximum allowable value
 964  *
 965  * The do_proc_douintvec_minmax_conv_param structure provides the
 966  * minimum and maximum values for doing range checking for those sysctl
 967  * parameters that use the proc_douintvec_minmax() handler.
 968  */
 969 struct do_proc_douintvec_minmax_conv_param {
 970         unsigned int *min;
 971         unsigned int *max;
 972 };
 973
 974 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
 975                                          unsigned int *valp,
 976                                          int write, void *data)
 977 {
 978         int ret;
 979         unsigned int tmp;
 980         struct do_proc_douintvec_minmax_conv_param *param = data;
 981         /* write via temporary local uint for bounds-checking */
 982         unsigned int *up = write ? &tmp : valp;
 983
 984         ret = do_proc_douintvec_conv(lvalp, up, write, data);
 985         if (ret)
 986                 return ret;
 987
 988         if (write) {
 989                 if ((param->min && *param->min > tmp) ||
 990                     (param->max && *param->max < tmp))
 991                         return -ERANGE;
 992
 993                 *valp = tmp;
 994         }
 995
 996         return 0;
 997 }
 998
 999 /**
1000  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1001  * @table: the sysctl table
1002  * @write: %TRUE if this is a write to the sysctl file
1003  * @buffer: the user buffer
1004  * @lenp: the size of the user buffer
1005  * @ppos: file position
1006  *
1007  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1008  * values from/to the user buffer, treated as an ASCII string. Negative
1009  * strings are not allowed.
1010  *
1011  * This routine will ensure the values are within the range specified by
1012  * table->extra1 (min) and table->extra2 (max). There is a final sanity
1013  * check for UINT_MAX to avoid having to support wrap around uses from
1014  * userspace.
1015  *
1016  * Returns 0 on success or -ERANGE on write when the range check fails.
1017  */
1018 int proc_douintvec_minmax(struct ctl_table *table, int write,
1019                           void *buffer, size_t *lenp, loff_t *ppos)
1020 {
1021         struct do_proc_douintvec_minmax_conv_param param = {
1022                 .min = (unsigned int *) table->extra1,
1023                 .max = (unsigned int *) table->extra2,
1024         };
1025         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1026                                  do_proc_douintvec_minmax_conv, &param);
1027 }
1028
1029 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1030                                         unsigned int *valp,
1031                                         int write, void *data)
1032 {
1033         if (write) {
1034                 unsigned int val;
1035
1036                 val = round_pipe_size(*lvalp);
1037                 if (val == 0)
1038                         return -EINVAL;
1039
1040                 *valp = val;
1041         } else {
1042                 unsigned int val = *valp;
1043                 *lvalp = (unsigned long) val;
1044         }
1045
1046         return 0;
1047 }
1048
1049 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1050                                 void *buffer, size_t *lenp, loff_t *ppos)
1051 {
1052         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1053                                  do_proc_dopipe_max_size_conv, NULL);
1054 }
1055
1056 static void validate_coredump_safety(void)
1057 {
1058 #ifdef CONFIG_COREDUMP
1059         if (suid_dumpable == SUID_DUMP_ROOT &&
1060             core_pattern[0] != '/' && core_pattern[0] != '|') {
1061                 printk(KERN_WARNING
1062 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1063 "Pipe handler or fully qualified core dump path required.\n"
1064 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1065                 );
1066         }
1067 #endif
1068 }
1069
1070 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1071                 void *buffer, size_t *lenp, loff_t *ppos)
1072 {
1073         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1074         if (!error)
1075                 validate_coredump_safety();
1076         return error;
1077 }
1078
1079 #ifdef CONFIG_COREDUMP
1080 static int proc_dostring_coredump(struct ctl_table *table, int write,
1081                   void *buffer, size_t *lenp, loff_t *ppos)
1082 {
1083         int error = proc_dostring(table, write, buffer, lenp, ppos);
1084         if (!error)
1085                 validate_coredump_safety();
1086         return error;
1087 }
1088 #endif
1089
1090 #ifdef CONFIG_MAGIC_SYSRQ
1091 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1092                                 void *buffer, size_t *lenp, loff_t *ppos)
1093 {
1094         int tmp, ret;
1095
1096         tmp = sysrq_mask();
1097
1098         ret = __do_proc_dointvec(&tmp, table, write, buffer,
1099                                lenp, ppos, NULL, NULL);
1100         if (ret || !write)
1101                 return ret;
1102
1103         if (write)
1104                 sysrq_toggle_support(tmp);
1105
1106         return 0;
1107 }
1108 #endif
1109
1110 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1111                 int write, void *buffer, size_t *lenp, loff_t *ppos,
1112                 unsigned long convmul, unsigned long convdiv)
1113 {
1114         unsigned long *i, *min, *max;
1115         int vleft, first = 1, err = 0;
1116         size_t left;
1117         char *p;
1118
1119         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1120                 *lenp = 0;
1121                 return 0;
1122         }
1123
1124         i = (unsigned long *) data;
1125         min = (unsigned long *) table->extra1;
1126         max = (unsigned long *) table->extra2;
1127         vleft = table->maxlen / sizeof(unsigned long);
1128         left = *lenp;
1129
1130         if (write) {
1131                 if (proc_first_pos_non_zero_ignore(ppos, table))
1132                         goto out;
1133
1134                 if (left > PAGE_SIZE - 1)
1135                         left = PAGE_SIZE - 1;
1136                 p = buffer;
1137         }
1138
1139         for (; left && vleft--; i++, first = 0) {
1140                 unsigned long val;
1141
1142                 if (write) {
1143                         bool neg;
1144
1145                         left -= proc_skip_spaces(&p);
1146                         if (!left)
1147                                 break;
1148
1149                         err = proc_get_long(&p, &left, &val, &neg,
1150                                              proc_wspace_sep,
1151                                              sizeof(proc_wspace_sep), NULL);
1152                         if (err)
1153                                 break;
1154                         if (neg)
1155                                 continue;
1156                         val = convmul * val / convdiv;
1157                         if ((min && val < *min) || (max && val > *max)) {
1158                                 err = -EINVAL;
1159                                 break;
1160                         }
1161                         *i = val;
1162                 } else {
1163                         val = convdiv * (*i) / convmul;
1164                         if (!first)
1165                                 proc_put_char(&buffer, &left, '\t');
1166                         proc_put_long(&buffer, &left, val, false);
1167                 }
1168         }
1169
1170         if (!write && !first && left && !err)
1171                 proc_put_char(&buffer, &left, '\n');
1172         if (write && !err)
1173                 left -= proc_skip_spaces(&p);
1174         if (write && first)
1175                 return err ? : -EINVAL;
1176         *lenp -= left;
1177 out:
1178         *ppos += *lenp;
1179         return err;
1180 }
1181
1182 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1183                 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1184                 unsigned long convdiv)
1185 {
1186         return __do_proc_doulongvec_minmax(table->data, table, write,
1187                         buffer, lenp, ppos, convmul, convdiv);
1188 }
1189
1190 /**
1191  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1192  * @table: the sysctl table
1193  * @write: %TRUE if this is a write to the sysctl file
1194  * @buffer: the user buffer
1195  * @lenp: the size of the user buffer
1196  * @ppos: file position
1197  *
1198  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1199  * values from/to the user buffer, treated as an ASCII string.
1200  *
1201  * This routine will ensure the values are within the range specified by
1202  * table->extra1 (min) and table->extra2 (max).
1203  *
1204  * Returns 0 on success.
1205  */
1206 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1207                            void *buffer, size_t *lenp, loff_t *ppos)
1208 {
1209     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1210 }
1211
1212 /**
1213  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1214  * @table: the sysctl table
1215  * @write: %TRUE if this is a write to the sysctl file
1216  * @buffer: the user buffer
1217  * @lenp: the size of the user buffer
1218  * @ppos: file position
1219  *
1220  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1221  * values from/to the user buffer, treated as an ASCII string. The values
1222  * are treated as milliseconds, and converted to jiffies when they are stored.
1223  *
1224  * This routine will ensure the values are within the range specified by
1225  * table->extra1 (min) and table->extra2 (max).
1226  *
1227  * Returns 0 on success.
1228  */
1229 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1230                                       void *buffer, size_t *lenp, loff_t *ppos)
1231 {
1232     return do_proc_doulongvec_minmax(table, write, buffer,
1233                                      lenp, ppos, HZ, 1000l);
1234 }
1235
1236
1237 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1238                                          int *valp,
1239                                          int write, void *data)
1240 {
1241         if (write) {
1242                 if (*lvalp > INT_MAX / HZ)
1243                         return 1;
1244                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1245         } else {
1246                 int val = *valp;
1247                 unsigned long lval;
1248                 if (val < 0) {
1249                         *negp = true;
1250                         lval = -(unsigned long)val;
1251                 } else {
1252                         *negp = false;
1253                         lval = (unsigned long)val;
1254                 }
1255                 *lvalp = lval / HZ;
1256         }
1257         return 0;
1258 }
1259
1260 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1261                                                 int *valp,
1262                                                 int write, void *data)
1263 {
1264         if (write) {
1265                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1266                         return 1;
1267                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1268         } else {
1269                 int val = *valp;
1270                 unsigned long lval;
1271                 if (val < 0) {
1272                         *negp = true;
1273                         lval = -(unsigned long)val;
1274                 } else {
1275                         *negp = false;
1276                         lval = (unsigned long)val;
1277                 }
1278                 *lvalp = jiffies_to_clock_t(lval);
1279         }
1280         return 0;
1281 }
1282
1283 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1284                                             int *valp,
1285                                             int write, void *data)
1286 {
1287         if (write) {
1288                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1289
1290                 if (jif > INT_MAX)
1291                         return 1;
1292                 *valp = (int)jif;
1293         } else {
1294                 int val = *valp;
1295                 unsigned long lval;
1296                 if (val < 0) {
1297                         *negp = true;
1298                         lval = -(unsigned long)val;
1299                 } else {
1300                         *negp = false;
1301                         lval = (unsigned long)val;
1302                 }
1303                 *lvalp = jiffies_to_msecs(lval);
1304         }
1305         return 0;
1306 }
1307
1308 /**
1309  * proc_dointvec_jiffies - read a vector of integers as seconds
1310  * @table: the sysctl table
1311  * @write: %TRUE if this is a write to the sysctl file
1312  * @buffer: the user buffer
1313  * @lenp: the size of the user buffer
1314  * @ppos: file position
1315  *
1316  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1317  * values from/to the user buffer, treated as an ASCII string.
1318  * The values read are assumed to be in seconds, and are converted into
1319  * jiffies.
1320  *
1321  * Returns 0 on success.
1322  */
1323 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1324                           void *buffer, size_t *lenp, loff_t *ppos)
1325 {
1326     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1327                             do_proc_dointvec_jiffies_conv,NULL);
1328 }
1329
1330 /**
1331  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1332  * @table: the sysctl table
1333  * @write: %TRUE if this is a write to the sysctl file
1334  * @buffer: the user buffer
1335  * @lenp: the size of the user buffer
1336  * @ppos: pointer to the file position
1337  *
1338  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1339  * values from/to the user buffer, treated as an ASCII string.
1340  * The values read are assumed to be in 1/USER_HZ seconds, and
1341  * are converted into jiffies.
1342  *
1343  * Returns 0 on success.
1344  */
1345 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1346                                  void *buffer, size_t *lenp, loff_t *ppos)
1347 {
1348     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1349                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1350 }
1351
1352 /**
1353  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1354  * @table: the sysctl table
1355  * @write: %TRUE if this is a write to the sysctl file
1356  * @buffer: the user buffer
1357  * @lenp: the size of the user buffer
1358  * @ppos: file position
1359  * @ppos: the current position in the file
1360  *
1361  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1362  * values from/to the user buffer, treated as an ASCII string.
1363  * The values read are assumed to be in 1/1000 seconds, and
1364  * are converted into jiffies.
1365  *
1366  * Returns 0 on success.
1367  */
1368 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1369                 size_t *lenp, loff_t *ppos)
1370 {
1371         return do_proc_dointvec(table, write, buffer, lenp, ppos,
1372                                 do_proc_dointvec_ms_jiffies_conv, NULL);
1373 }
1374
1375 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1376                 size_t *lenp, loff_t *ppos)
1377 {
1378         struct pid *new_pid;
1379         pid_t tmp;
1380         int r;
1381
1382         tmp = pid_vnr(cad_pid);
1383
1384         r = __do_proc_dointvec(&tmp, table, write, buffer,
1385                                lenp, ppos, NULL, NULL);
1386         if (r || !write)
1387                 return r;
1388
1389         new_pid = find_get_pid(tmp);
1390         if (!new_pid)
1391                 return -ESRCH;
1392
1393         put_pid(xchg(&cad_pid, new_pid));
1394         return 0;
1395 }
1396
1397 /**
1398  * proc_do_large_bitmap - read/write from/to a large bitmap
1399  * @table: the sysctl table
1400  * @write: %TRUE if this is a write to the sysctl file
1401  * @buffer: the user buffer
1402  * @lenp: the size of the user buffer
1403  * @ppos: file position
1404  *
1405  * The bitmap is stored at table->data and the bitmap length (in bits)
1406  * in table->maxlen.
1407  *
1408  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1409  * large bitmaps may be represented in a compact manner. Writing into
1410  * the file will clear the bitmap then update it with the given input.
1411  *
1412  * Returns 0 on success.
1413  */
1414 int proc_do_large_bitmap(struct ctl_table *table, int write,
1415                          void *buffer, size_t *lenp, loff_t *ppos)
1416 {
1417         int err = 0;
1418         bool first = 1;
1419         size_t left = *lenp;
1420         unsigned long bitmap_len = table->maxlen;
1421         unsigned long *bitmap = *(unsigned long **) table->data;
1422         unsigned long *tmp_bitmap = NULL;
1423         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1424
1425         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1426                 *lenp = 0;
1427                 return 0;
1428         }
1429
1430         if (write) {
1431                 char *p = buffer;
1432                 size_t skipped = 0;
1433
1434                 if (left > PAGE_SIZE - 1) {
1435                         left = PAGE_SIZE - 1;
1436                         /* How much of the buffer we'll skip this pass */
1437                         skipped = *lenp - left;
1438                 }
1439
1440                 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1441                 if (!tmp_bitmap)
1442                         return -ENOMEM;
1443                 proc_skip_char(&p, &left, '\n');
1444                 while (!err && left) {
1445                         unsigned long val_a, val_b;
1446                         bool neg;
1447                         size_t saved_left;
1448
1449                         /* In case we stop parsing mid-number, we can reset */
1450                         saved_left = left;
1451                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1452                                              sizeof(tr_a), &c);
1453                         /*
1454                          * If we consumed the entirety of a truncated buffer or
1455                          * only one char is left (may be a "-"), then stop here,
1456                          * reset, & come back for more.
1457                          */
1458                         if ((left <= 1) && skipped) {
1459                                 left = saved_left;
1460                                 break;
1461                         }
1462
1463                         if (err)
1464                                 break;
1465                         if (val_a >= bitmap_len || neg) {
1466                                 err = -EINVAL;
1467                                 break;
1468                         }
1469
1470                         val_b = val_a;
1471                         if (left) {
1472                                 p++;
1473                                 left--;
1474                         }
1475
1476                         if (c == '-') {
1477                                 err = proc_get_long(&p, &left, &val_b,
1478                                                      &neg, tr_b, sizeof(tr_b),
1479                                                      &c);
1480                                 /*
1481                                  * If we consumed all of a truncated buffer or
1482                                  * then stop here, reset, & come back for more.
1483                                  */
1484                                 if (!left && skipped) {
1485                                         left = saved_left;
1486                                         break;
1487                                 }
1488
1489                                 if (err)
1490                                         break;
1491                                 if (val_b >= bitmap_len || neg ||
1492                                     val_a > val_b) {
1493                                         err = -EINVAL;
1494                                         break;
1495                                 }
1496                                 if (left) {
1497                                         p++;
1498                                         left--;
1499                                 }
1500                         }
1501
1502                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1503                         first = 0;
1504                         proc_skip_char(&p, &left, '\n');
1505                 }
1506                 left += skipped;
1507         } else {
1508                 unsigned long bit_a, bit_b = 0;
1509
1510                 while (left) {
1511                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1512                         if (bit_a >= bitmap_len)
1513                                 break;
1514                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
1515                                                    bit_a + 1) - 1;
1516
1517                         if (!first)
1518                                 proc_put_char(&buffer, &left, ',');
1519                         proc_put_long(&buffer, &left, bit_a, false);
1520                         if (bit_a != bit_b) {
1521                                 proc_put_char(&buffer, &left, '-');
1522                                 proc_put_long(&buffer, &left, bit_b, false);
1523                         }
1524
1525                         first = 0; bit_b++;
1526                 }
1527                 proc_put_char(&buffer, &left, '\n');
1528         }
1529
1530         if (!err) {
1531                 if (write) {
1532                         if (*ppos)
1533                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1534                         else
1535                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1536                 }
1537                 *lenp -= left;
1538                 *ppos += *lenp;
1539         }
1540
1541         bitmap_free(tmp_bitmap);
1542         return err;
1543 }
1544
1545 #else /* CONFIG_PROC_SYSCTL */
1546
1547 int proc_dostring(struct ctl_table *table, int write,
1548                   void *buffer, size_t *lenp, loff_t *ppos)
1549 {
1550         return -ENOSYS;
1551 }
1552
1553 int proc_dointvec(struct ctl_table *table, int write,
1554                   void *buffer, size_t *lenp, loff_t *ppos)
1555 {
1556         return -ENOSYS;
1557 }
1558
1559 int proc_douintvec(struct ctl_table *table, int write,
1560                   void *buffer, size_t *lenp, loff_t *ppos)
1561 {
1562         return -ENOSYS;
1563 }
1564
1565 int proc_dointvec_minmax(struct ctl_table *table, int write,
1566                     void *buffer, size_t *lenp, loff_t *ppos)
1567 {
1568         return -ENOSYS;
1569 }
1570
1571 int proc_douintvec_minmax(struct ctl_table *table, int write,
1572                           void *buffer, size_t *lenp, loff_t *ppos)
1573 {
1574         return -ENOSYS;
1575 }
1576
1577 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1578                     void *buffer, size_t *lenp, loff_t *ppos)
1579 {
1580         return -ENOSYS;
1581 }
1582
1583 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1584                     void *buffer, size_t *lenp, loff_t *ppos)
1585 {
1586         return -ENOSYS;
1587 }
1588
1589 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1590                              void *buffer, size_t *lenp, loff_t *ppos)
1591 {
1592         return -ENOSYS;
1593 }
1594
1595 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1596                     void *buffer, size_t *lenp, loff_t *ppos)
1597 {
1598         return -ENOSYS;
1599 }
1600
1601 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1602                                       void *buffer, size_t *lenp, loff_t *ppos)
1603 {
1604         return -ENOSYS;
1605 }
1606
1607 int proc_do_large_bitmap(struct ctl_table *table, int write,
1608                          void *buffer, size_t *lenp, loff_t *ppos)
1609 {
1610         return -ENOSYS;
1611 }
1612
1613 #endif /* CONFIG_PROC_SYSCTL */
1614
1615 #if defined(CONFIG_SYSCTL)
1616 int proc_do_static_key(struct ctl_table *table, int write,
1617                        void *buffer, size_t *lenp, loff_t *ppos)
1618 {
1619         struct static_key *key = (struct static_key *)table->data;
1620         static DEFINE_MUTEX(static_key_mutex);
1621         int val, ret;
1622         struct ctl_table tmp = {
1623                 .data   = &val,
1624                 .maxlen = sizeof(val),
1625                 .mode   = table->mode,
1626                 .extra1 = SYSCTL_ZERO,
1627                 .extra2 = SYSCTL_ONE,
1628         };
1629
1630         if (write && !capable(CAP_SYS_ADMIN))
1631                 return -EPERM;
1632
1633         mutex_lock(&static_key_mutex);
1634         val = static_key_enabled(key);
1635         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1636         if (write && !ret) {
1637                 if (val)
1638                         static_key_enable(key);
1639                 else
1640                         static_key_disable(key);
1641         }
1642         mutex_unlock(&static_key_mutex);
1643         return ret;
1644 }
1645
1646 static struct ctl_table kern_table[] = {
1647         {
1648                 .procname       = "sched_child_runs_first",
1649                 .data           = &sysctl_sched_child_runs_first,
1650                 .maxlen         = sizeof(unsigned int),
1651                 .mode           = 0644,
1652                 .proc_handler   = proc_dointvec,
1653         },
1654 #ifdef CONFIG_SCHEDSTATS
1655         {
1656                 .procname       = "sched_schedstats",
1657                 .data           = NULL,
1658                 .maxlen         = sizeof(unsigned int),
1659                 .mode           = 0644,
1660                 .proc_handler   = sysctl_schedstats,
1661                 .extra1         = SYSCTL_ZERO,
1662                 .extra2         = SYSCTL_ONE,
1663         },
1664 #endif /* CONFIG_SCHEDSTATS */
1665 #ifdef CONFIG_NUMA_BALANCING
1666         {
1667                 .procname       = "numa_balancing",
1668                 .data           = NULL, /* filled in by handler */
1669                 .maxlen         = sizeof(unsigned int),
1670                 .mode           = 0644,
1671                 .proc_handler   = sysctl_numa_balancing,
1672                 .extra1         = SYSCTL_ZERO,
1673                 .extra2         = SYSCTL_ONE,
1674         },
1675 #endif /* CONFIG_NUMA_BALANCING */
1676         {
1677                 .procname       = "sched_rt_period_us",
1678                 .data           = &sysctl_sched_rt_period,
1679                 .maxlen         = sizeof(unsigned int),
1680                 .mode           = 0644,
1681                 .proc_handler   = sched_rt_handler,
1682         },
1683         {
1684                 .procname       = "sched_rt_runtime_us",
1685                 .data           = &sysctl_sched_rt_runtime,
1686                 .maxlen         = sizeof(int),
1687                 .mode           = 0644,
1688                 .proc_handler   = sched_rt_handler,
1689         },
1690         {
1691                 .procname       = "sched_deadline_period_max_us",
1692                 .data           = &sysctl_sched_dl_period_max,
1693                 .maxlen         = sizeof(unsigned int),
1694                 .mode           = 0644,
1695                 .proc_handler   = proc_dointvec,
1696         },
1697         {
1698                 .procname       = "sched_deadline_period_min_us",
1699                 .data           = &sysctl_sched_dl_period_min,
1700                 .maxlen         = sizeof(unsigned int),
1701                 .mode           = 0644,
1702                 .proc_handler   = proc_dointvec,
1703         },
1704         {
1705                 .procname       = "sched_rr_timeslice_ms",
1706                 .data           = &sysctl_sched_rr_timeslice,
1707                 .maxlen         = sizeof(int),
1708                 .mode           = 0644,
1709                 .proc_handler   = sched_rr_handler,
1710         },
1711 #ifdef CONFIG_UCLAMP_TASK
1712         {
1713                 .procname       = "sched_util_clamp_min",
1714                 .data           = &sysctl_sched_uclamp_util_min,
1715                 .maxlen         = sizeof(unsigned int),
1716                 .mode           = 0644,
1717                 .proc_handler   = sysctl_sched_uclamp_handler,
1718         },
1719         {
1720                 .procname       = "sched_util_clamp_max",
1721                 .data           = &sysctl_sched_uclamp_util_max,
1722                 .maxlen         = sizeof(unsigned int),
1723                 .mode           = 0644,
1724                 .proc_handler   = sysctl_sched_uclamp_handler,
1725         },
1726         {
1727                 .procname       = "sched_util_clamp_min_rt_default",
1728                 .data           = &sysctl_sched_uclamp_util_min_rt_default,
1729                 .maxlen         = sizeof(unsigned int),
1730                 .mode           = 0644,
1731                 .proc_handler   = sysctl_sched_uclamp_handler,
1732         },
1733 #endif
1734 #ifdef CONFIG_SCHED_AUTOGROUP
1735         {
1736                 .procname       = "sched_autogroup_enabled",
1737                 .data           = &sysctl_sched_autogroup_enabled,
1738                 .maxlen         = sizeof(unsigned int),
1739                 .mode           = 0644,
1740                 .proc_handler   = proc_dointvec_minmax,
1741                 .extra1         = SYSCTL_ZERO,
1742                 .extra2         = SYSCTL_ONE,
1743         },
1744 #endif
1745 #ifdef CONFIG_CFS_BANDWIDTH
1746         {
1747                 .procname       = "sched_cfs_bandwidth_slice_us",
1748                 .data           = &sysctl_sched_cfs_bandwidth_slice,
1749                 .maxlen         = sizeof(unsigned int),
1750                 .mode           = 0644,
1751                 .proc_handler   = proc_dointvec_minmax,
1752                 .extra1         = SYSCTL_ONE,
1753         },
1754 #endif
1755 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1756         {
1757                 .procname       = "sched_energy_aware",
1758                 .data           = &sysctl_sched_energy_aware,
1759                 .maxlen         = sizeof(unsigned int),
1760                 .mode           = 0644,
1761                 .proc_handler   = sched_energy_aware_handler,
1762                 .extra1         = SYSCTL_ZERO,
1763                 .extra2         = SYSCTL_ONE,
1764         },
1765 #endif
1766 #ifdef CONFIG_PROVE_LOCKING
1767         {
1768                 .procname       = "prove_locking",
1769                 .data           = &prove_locking,
1770                 .maxlen         = sizeof(int),
1771                 .mode           = 0644,
1772                 .proc_handler   = proc_dointvec,
1773         },
1774 #endif
1775 #ifdef CONFIG_LOCK_STAT
1776         {
1777                 .procname       = "lock_stat",
1778                 .data           = &lock_stat,
1779                 .maxlen         = sizeof(int),
1780                 .mode           = 0644,
1781                 .proc_handler   = proc_dointvec,
1782         },
1783 #endif
1784         {
1785                 .procname       = "panic",
1786                 .data           = &panic_timeout,
1787                 .maxlen         = sizeof(int),
1788                 .mode           = 0644,
1789                 .proc_handler   = proc_dointvec,
1790         },
1791 #ifdef CONFIG_COREDUMP
1792         {
1793                 .procname       = "core_uses_pid",
1794                 .data           = &core_uses_pid,
1795                 .maxlen         = sizeof(int),
1796                 .mode           = 0644,
1797                 .proc_handler   = proc_dointvec,
1798         },
1799         {
1800                 .procname       = "core_pattern",
1801                 .data           = core_pattern,
1802                 .maxlen         = CORENAME_MAX_SIZE,
1803                 .mode           = 0644,
1804                 .proc_handler   = proc_dostring_coredump,
1805         },
1806         {
1807                 .procname       = "core_pipe_limit",
1808                 .data           = &core_pipe_limit,
1809                 .maxlen         = sizeof(unsigned int),
1810                 .mode           = 0644,
1811                 .proc_handler   = proc_dointvec,
1812         },
1813 #endif
1814 #ifdef CONFIG_PROC_SYSCTL
1815         {
1816                 .procname       = "tainted",
1817                 .maxlen         = sizeof(long),
1818                 .mode           = 0644,
1819                 .proc_handler   = proc_taint,
1820         },
1821         {
1822                 .procname       = "sysctl_writes_strict",
1823                 .data           = &sysctl_writes_strict,
1824                 .maxlen         = sizeof(int),
1825                 .mode           = 0644,
1826                 .proc_handler   = proc_dointvec_minmax,
1827                 .extra1         = &neg_one,
1828                 .extra2         = SYSCTL_ONE,
1829         },
1830 #endif
1831 #ifdef CONFIG_LATENCYTOP
1832         {
1833                 .procname       = "latencytop",
1834                 .data           = &latencytop_enabled,
1835                 .maxlen         = sizeof(int),
1836                 .mode           = 0644,
1837                 .proc_handler   = sysctl_latencytop,
1838         },
1839 #endif
1840 #ifdef CONFIG_BLK_DEV_INITRD
1841         {
1842                 .procname       = "real-root-dev",
1843                 .data           = &real_root_dev,
1844                 .maxlen         = sizeof(int),
1845                 .mode           = 0644,
1846                 .proc_handler   = proc_dointvec,
1847         },
1848 #endif
1849         {
1850                 .procname       = "print-fatal-signals",
1851                 .data           = &print_fatal_signals,
1852                 .maxlen         = sizeof(int),
1853                 .mode           = 0644,
1854                 .proc_handler   = proc_dointvec,
1855         },
1856 #ifdef CONFIG_SPARC
1857         {
1858                 .procname       = "reboot-cmd",
1859                 .data           = reboot_command,
1860                 .maxlen         = 256,
1861                 .mode           = 0644,
1862                 .proc_handler   = proc_dostring,
1863         },
1864         {
1865                 .procname       = "stop-a",
1866                 .data           = &stop_a_enabled,
1867                 .maxlen         = sizeof (int),
1868                 .mode           = 0644,
1869                 .proc_handler   = proc_dointvec,
1870         },
1871         {
1872                 .procname       = "scons-poweroff",
1873                 .data           = &scons_pwroff,
1874                 .maxlen         = sizeof (int),
1875                 .mode           = 0644,
1876                 .proc_handler   = proc_dointvec,
1877         },
1878 #endif
1879 #ifdef CONFIG_SPARC64
1880         {
1881                 .procname       = "tsb-ratio",
1882                 .data           = &sysctl_tsb_ratio,
1883                 .maxlen         = sizeof (int),
1884                 .mode           = 0644,
1885                 .proc_handler   = proc_dointvec,
1886         },
1887 #endif
1888 #ifdef CONFIG_PARISC
1889         {
1890                 .procname       = "soft-power",
1891                 .data           = &pwrsw_enabled,
1892                 .maxlen         = sizeof (int),
1893                 .mode           = 0644,
1894                 .proc_handler   = proc_dointvec,
1895         },
1896 #endif
1897 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1898         {
1899                 .procname       = "unaligned-trap",
1900                 .data           = &unaligned_enabled,
1901                 .maxlen         = sizeof (int),
1902                 .mode           = 0644,
1903                 .proc_handler   = proc_dointvec,
1904         },
1905 #endif
1906         {
1907                 .procname       = "ctrl-alt-del",
1908                 .data           = &C_A_D,
1909                 .maxlen         = sizeof(int),
1910                 .mode           = 0644,
1911                 .proc_handler   = proc_dointvec,
1912         },
1913 #ifdef CONFIG_FUNCTION_TRACER
1914         {
1915                 .procname       = "ftrace_enabled",
1916                 .data           = &ftrace_enabled,
1917                 .maxlen         = sizeof(int),
1918                 .mode           = 0644,
1919                 .proc_handler   = ftrace_enable_sysctl,
1920         },
1921 #endif
1922 #ifdef CONFIG_STACK_TRACER
1923         {
1924                 .procname       = "stack_tracer_enabled",
1925                 .data           = &stack_tracer_enabled,
1926                 .maxlen         = sizeof(int),
1927                 .mode           = 0644,
1928                 .proc_handler   = stack_trace_sysctl,
1929         },
1930 #endif
1931 #ifdef CONFIG_TRACING
1932         {
1933                 .procname       = "ftrace_dump_on_oops",
1934                 .data           = &ftrace_dump_on_oops,
1935                 .maxlen         = sizeof(int),
1936                 .mode           = 0644,
1937                 .proc_handler   = proc_dointvec,
1938         },
1939         {
1940                 .procname       = "traceoff_on_warning",
1941                 .data           = &__disable_trace_on_warning,
1942                 .maxlen         = sizeof(__disable_trace_on_warning),
1943                 .mode           = 0644,
1944                 .proc_handler   = proc_dointvec,
1945         },
1946         {
1947                 .procname       = "tracepoint_printk",
1948                 .data           = &tracepoint_printk,
1949                 .maxlen         = sizeof(tracepoint_printk),
1950                 .mode           = 0644,
1951                 .proc_handler   = tracepoint_printk_sysctl,
1952         },
1953 #endif
1954 #ifdef CONFIG_KEXEC_CORE
1955         {
1956                 .procname       = "kexec_load_disabled",
1957                 .data           = &kexec_load_disabled,
1958                 .maxlen         = sizeof(int),
1959                 .mode           = 0644,
1960                 /* only handle a transition from default "0" to "1" */
1961                 .proc_handler   = proc_dointvec_minmax,
1962                 .extra1         = SYSCTL_ONE,
1963                 .extra2         = SYSCTL_ONE,
1964         },
1965 #endif
1966 #ifdef CONFIG_MODULES
1967         {
1968                 .procname       = "modprobe",
1969                 .data           = &modprobe_path,
1970                 .maxlen         = KMOD_PATH_LEN,
1971                 .mode           = 0644,
1972                 .proc_handler   = proc_dostring,
1973         },
1974         {
1975                 .procname       = "modules_disabled",
1976                 .data           = &modules_disabled,
1977                 .maxlen         = sizeof(int),
1978                 .mode           = 0644,
1979                 /* only handle a transition from default "0" to "1" */
1980                 .proc_handler   = proc_dointvec_minmax,
1981                 .extra1         = SYSCTL_ONE,
1982                 .extra2         = SYSCTL_ONE,
1983         },
1984 #endif
1985 #ifdef CONFIG_UEVENT_HELPER
1986         {
1987                 .procname       = "hotplug",
1988                 .data           = &uevent_helper,
1989                 .maxlen         = UEVENT_HELPER_PATH_LEN,
1990                 .mode           = 0644,
1991                 .proc_handler   = proc_dostring,
1992         },
1993 #endif
1994 #ifdef CONFIG_CHR_DEV_SG
1995         {
1996                 .procname       = "sg-big-buff",
1997                 .data           = &sg_big_buff,
1998                 .maxlen         = sizeof (int),
1999                 .mode           = 0444,
2000                 .proc_handler   = proc_dointvec,
2001         },
2002 #endif
2003 #ifdef CONFIG_BSD_PROCESS_ACCT
2004         {
2005                 .procname       = "acct",
2006                 .data           = &acct_parm,
2007                 .maxlen         = 3*sizeof(int),
2008                 .mode           = 0644,
2009                 .proc_handler   = proc_dointvec,
2010         },
2011 #endif
2012 #ifdef CONFIG_MAGIC_SYSRQ
2013         {
2014                 .procname       = "sysrq",
2015                 .data           = NULL,
2016                 .maxlen         = sizeof (int),
2017                 .mode           = 0644,
2018                 .proc_handler   = sysrq_sysctl_handler,
2019         },
2020 #endif
2021 #ifdef CONFIG_PROC_SYSCTL
2022         {
2023                 .procname       = "cad_pid",
2024                 .data           = NULL,
2025                 .maxlen         = sizeof (int),
2026                 .mode           = 0600,
2027                 .proc_handler   = proc_do_cad_pid,
2028         },
2029 #endif
2030         {
2031                 .procname       = "threads-max",
2032                 .data           = NULL,
2033                 .maxlen         = sizeof(int),
2034                 .mode           = 0644,
2035                 .proc_handler   = sysctl_max_threads,
2036         },
2037         {
2038                 .procname       = "random",
2039                 .mode           = 0555,
2040                 .child          = random_table,
2041         },
2042         {
2043                 .procname       = "usermodehelper",
2044                 .mode           = 0555,
2045                 .child          = usermodehelper_table,
2046         },
2047 #ifdef CONFIG_FW_LOADER_USER_HELPER
2048         {
2049                 .procname       = "firmware_config",
2050                 .mode           = 0555,
2051                 .child          = firmware_config_table,
2052         },
2053 #endif
2054         {
2055                 .procname       = "overflowuid",
2056                 .data           = &overflowuid,
2057                 .maxlen         = sizeof(int),
2058                 .mode           = 0644,
2059                 .proc_handler   = proc_dointvec_minmax,
2060                 .extra1         = &minolduid,
2061                 .extra2         = &maxolduid,
2062         },
2063         {
2064                 .procname       = "overflowgid",
2065                 .data           = &overflowgid,
2066                 .maxlen         = sizeof(int),
2067                 .mode           = 0644,
2068                 .proc_handler   = proc_dointvec_minmax,
2069                 .extra1         = &minolduid,
2070                 .extra2         = &maxolduid,
2071         },
2072 #ifdef CONFIG_S390
2073         {
2074                 .procname       = "userprocess_debug",
2075                 .data           = &show_unhandled_signals,
2076                 .maxlen         = sizeof(int),
2077                 .mode           = 0644,
2078                 .proc_handler   = proc_dointvec,
2079         },
2080 #endif
2081 #ifdef CONFIG_SMP
2082         {
2083                 .procname       = "oops_all_cpu_backtrace",
2084                 .data           = &sysctl_oops_all_cpu_backtrace,
2085                 .maxlen         = sizeof(int),
2086                 .mode           = 0644,
2087                 .proc_handler   = proc_dointvec_minmax,
2088                 .extra1         = SYSCTL_ZERO,
2089                 .extra2         = SYSCTL_ONE,
2090         },
2091 #endif /* CONFIG_SMP */
2092         {
2093                 .procname       = "pid_max",
2094                 .data           = &pid_max,
2095                 .maxlen         = sizeof (int),
2096                 .mode           = 0644,
2097                 .proc_handler   = proc_dointvec_minmax,
2098                 .extra1         = &pid_max_min,
2099                 .extra2         = &pid_max_max,
2100         },
2101         {
2102                 .procname       = "panic_on_oops",
2103                 .data           = &panic_on_oops,
2104                 .maxlen         = sizeof(int),
2105                 .mode           = 0644,
2106                 .proc_handler   = proc_dointvec,
2107         },
2108         {
2109                 .procname       = "panic_print",
2110                 .data           = &panic_print,
2111                 .maxlen         = sizeof(unsigned long),
2112                 .mode           = 0644,
2113                 .proc_handler   = proc_doulongvec_minmax,
2114         },
2115 #if defined CONFIG_PRINTK
2116         {
2117                 .procname       = "printk",
2118                 .data           = &console_loglevel,
2119                 .maxlen         = 4*sizeof(int),
2120                 .mode           = 0644,
2121                 .proc_handler   = proc_dointvec,
2122         },
2123         {
2124                 .procname       = "printk_ratelimit",
2125                 .data           = &printk_ratelimit_state.interval,
2126                 .maxlen         = sizeof(int),
2127                 .mode           = 0644,
2128                 .proc_handler   = proc_dointvec_jiffies,
2129         },
2130         {
2131                 .procname       = "printk_ratelimit_burst",
2132                 .data           = &printk_ratelimit_state.burst,
2133                 .maxlen         = sizeof(int),
2134                 .mode           = 0644,
2135                 .proc_handler   = proc_dointvec,
2136         },
2137         {
2138                 .procname       = "printk_delay",
2139                 .data           = &printk_delay_msec,
2140                 .maxlen         = sizeof(int),
2141                 .mode           = 0644,
2142                 .proc_handler   = proc_dointvec_minmax,
2143                 .extra1         = SYSCTL_ZERO,
2144                 .extra2         = &ten_thousand,
2145         },
2146         {
2147                 .procname       = "printk_devkmsg",
2148                 .data           = devkmsg_log_str,
2149                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
2150                 .mode           = 0644,
2151                 .proc_handler   = devkmsg_sysctl_set_loglvl,
2152         },
2153         {
2154                 .procname       = "dmesg_restrict",
2155                 .data           = &dmesg_restrict,
2156                 .maxlen         = sizeof(int),
2157                 .mode           = 0644,
2158                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2159                 .extra1         = SYSCTL_ZERO,
2160                 .extra2         = SYSCTL_ONE,
2161         },
2162         {
2163                 .procname       = "kptr_restrict",
2164                 .data           = &kptr_restrict,
2165                 .maxlen         = sizeof(int),
2166                 .mode           = 0644,
2167                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2168                 .extra1         = SYSCTL_ZERO,
2169                 .extra2         = &two,
2170         },
2171 #endif
2172         {
2173                 .procname       = "ngroups_max",
2174                 .data           = &ngroups_max,
2175                 .maxlen         = sizeof (int),
2176                 .mode           = 0444,
2177                 .proc_handler   = proc_dointvec,
2178         },
2179         {
2180                 .procname       = "cap_last_cap",
2181                 .data           = (void *)&cap_last_cap,
2182                 .maxlen         = sizeof(int),
2183                 .mode           = 0444,
2184                 .proc_handler   = proc_dointvec,
2185         },
2186 #if defined(CONFIG_LOCKUP_DETECTOR)
2187         {
2188                 .procname       = "watchdog",
2189                 .data           = &watchdog_user_enabled,
2190                 .maxlen         = sizeof(int),
2191                 .mode           = 0644,
2192                 .proc_handler   = proc_watchdog,
2193                 .extra1         = SYSCTL_ZERO,
2194                 .extra2         = SYSCTL_ONE,
2195         },
2196         {
2197                 .procname       = "watchdog_thresh",
2198                 .data           = &watchdog_thresh,
2199                 .maxlen         = sizeof(int),
2200                 .mode           = 0644,
2201                 .proc_handler   = proc_watchdog_thresh,
2202                 .extra1         = SYSCTL_ZERO,
2203                 .extra2         = &sixty,
2204         },
2205         {
2206                 .procname       = "nmi_watchdog",
2207                 .data           = &nmi_watchdog_user_enabled,
2208                 .maxlen         = sizeof(int),
2209                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
2210                 .proc_handler   = proc_nmi_watchdog,
2211                 .extra1         = SYSCTL_ZERO,
2212                 .extra2         = SYSCTL_ONE,
2213         },
2214         {
2215                 .procname       = "watchdog_cpumask",
2216                 .data           = &watchdog_cpumask_bits,
2217                 .maxlen         = NR_CPUS,
2218                 .mode           = 0644,
2219                 .proc_handler   = proc_watchdog_cpumask,
2220         },
2221 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2222         {
2223                 .procname       = "soft_watchdog",
2224                 .data           = &soft_watchdog_user_enabled,
2225                 .maxlen         = sizeof(int),
2226                 .mode           = 0644,
2227                 .proc_handler   = proc_soft_watchdog,
2228                 .extra1         = SYSCTL_ZERO,
2229                 .extra2         = SYSCTL_ONE,
2230         },
2231         {
2232                 .procname       = "softlockup_panic",
2233                 .data           = &softlockup_panic,
2234                 .maxlen         = sizeof(int),
2235                 .mode           = 0644,
2236                 .proc_handler   = proc_dointvec_minmax,
2237                 .extra1         = SYSCTL_ZERO,
2238                 .extra2         = SYSCTL_ONE,
2239         },
2240 #ifdef CONFIG_SMP
2241         {
2242                 .procname       = "softlockup_all_cpu_backtrace",
2243                 .data           = &sysctl_softlockup_all_cpu_backtrace,
2244                 .maxlen         = sizeof(int),
2245                 .mode           = 0644,
2246                 .proc_handler   = proc_dointvec_minmax,
2247                 .extra1         = SYSCTL_ZERO,
2248                 .extra2         = SYSCTL_ONE,
2249         },
2250 #endif /* CONFIG_SMP */
2251 #endif
2252 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2253         {
2254                 .procname       = "hardlockup_panic",
2255                 .data           = &hardlockup_panic,
2256                 .maxlen         = sizeof(int),
2257                 .mode           = 0644,
2258                 .proc_handler   = proc_dointvec_minmax,
2259                 .extra1         = SYSCTL_ZERO,
2260                 .extra2         = SYSCTL_ONE,
2261         },
2262 #ifdef CONFIG_SMP
2263         {
2264                 .procname       = "hardlockup_all_cpu_backtrace",
2265                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
2266                 .maxlen         = sizeof(int),
2267                 .mode           = 0644,
2268                 .proc_handler   = proc_dointvec_minmax,
2269                 .extra1         = SYSCTL_ZERO,
2270                 .extra2         = SYSCTL_ONE,
2271         },
2272 #endif /* CONFIG_SMP */
2273 #endif
2274 #endif
2275
2276 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2277         {
2278                 .procname       = "unknown_nmi_panic",
2279                 .data           = &unknown_nmi_panic,
2280                 .maxlen         = sizeof (int),
2281                 .mode           = 0644,
2282                 .proc_handler   = proc_dointvec,
2283         },
2284 #endif
2285
2286 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2287         defined(CONFIG_DEBUG_STACKOVERFLOW)
2288         {
2289                 .procname       = "panic_on_stackoverflow",
2290                 .data           = &sysctl_panic_on_stackoverflow,
2291                 .maxlen         = sizeof(int),
2292                 .mode           = 0644,
2293                 .proc_handler   = proc_dointvec,
2294         },
2295 #endif
2296 #if defined(CONFIG_X86)
2297         {
2298                 .procname       = "panic_on_unrecovered_nmi",
2299                 .data           = &panic_on_unrecovered_nmi,
2300                 .maxlen         = sizeof(int),
2301                 .mode           = 0644,
2302                 .proc_handler   = proc_dointvec,
2303         },
2304         {
2305                 .procname       = "panic_on_io_nmi",
2306                 .data           = &panic_on_io_nmi,
2307                 .maxlen         = sizeof(int),
2308                 .mode           = 0644,
2309                 .proc_handler   = proc_dointvec,
2310         },
2311         {
2312                 .procname       = "bootloader_type",
2313                 .data           = &bootloader_type,
2314                 .maxlen         = sizeof (int),
2315                 .mode           = 0444,
2316                 .proc_handler   = proc_dointvec,
2317         },
2318         {
2319                 .procname       = "bootloader_version",
2320                 .data           = &bootloader_version,
2321                 .maxlen         = sizeof (int),
2322                 .mode           = 0444,
2323                 .proc_handler   = proc_dointvec,
2324         },
2325         {
2326                 .procname       = "io_delay_type",
2327                 .data           = &io_delay_type,
2328                 .maxlen         = sizeof(int),
2329                 .mode           = 0644,
2330                 .proc_handler   = proc_dointvec,
2331         },
2332 #endif
2333 #if defined(CONFIG_MMU)
2334         {
2335                 .procname       = "randomize_va_space",
2336                 .data           = &randomize_va_space,
2337                 .maxlen         = sizeof(int),
2338                 .mode           = 0644,
2339                 .proc_handler   = proc_dointvec,
2340         },
2341 #endif
2342 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2343         {
2344                 .procname       = "spin_retry",
2345                 .data           = &spin_retry,
2346                 .maxlen         = sizeof (int),
2347                 .mode           = 0644,
2348                 .proc_handler   = proc_dointvec,
2349         },
2350 #endif
2351 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2352         {
2353                 .procname       = "acpi_video_flags",
2354                 .data           = &acpi_realmode_flags,
2355                 .maxlen         = sizeof (unsigned long),
2356                 .mode           = 0644,
2357                 .proc_handler   = proc_doulongvec_minmax,
2358         },
2359 #endif
2360 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2361         {
2362                 .procname       = "ignore-unaligned-usertrap",
2363                 .data           = &no_unaligned_warning,
2364                 .maxlen         = sizeof (int),
2365                 .mode           = 0644,
2366                 .proc_handler   = proc_dointvec,
2367         },
2368 #endif
2369 #ifdef CONFIG_IA64
2370         {
2371                 .procname       = "unaligned-dump-stack",
2372                 .data           = &unaligned_dump_stack,
2373                 .maxlen         = sizeof (int),
2374                 .mode           = 0644,
2375                 .proc_handler   = proc_dointvec,
2376         },
2377 #endif
2378 #ifdef CONFIG_DETECT_HUNG_TASK
2379 #ifdef CONFIG_SMP
2380         {
2381                 .procname       = "hung_task_all_cpu_backtrace",
2382                 .data           = &sysctl_hung_task_all_cpu_backtrace,
2383                 .maxlen         = sizeof(int),
2384                 .mode           = 0644,
2385                 .proc_handler   = proc_dointvec_minmax,
2386                 .extra1         = SYSCTL_ZERO,
2387                 .extra2         = SYSCTL_ONE,
2388         },
2389 #endif /* CONFIG_SMP */
2390         {
2391                 .procname       = "hung_task_panic",
2392                 .data           = &sysctl_hung_task_panic,
2393                 .maxlen         = sizeof(int),
2394                 .mode           = 0644,
2395                 .proc_handler   = proc_dointvec_minmax,
2396                 .extra1         = SYSCTL_ZERO,
2397                 .extra2         = SYSCTL_ONE,
2398         },
2399         {
2400                 .procname       = "hung_task_check_count",
2401                 .data           = &sysctl_hung_task_check_count,
2402                 .maxlen         = sizeof(int),
2403                 .mode           = 0644,
2404                 .proc_handler   = proc_dointvec_minmax,
2405                 .extra1         = SYSCTL_ZERO,
2406         },
2407         {
2408                 .procname       = "hung_task_timeout_secs",
2409                 .data           = &sysctl_hung_task_timeout_secs,
2410                 .maxlen         = sizeof(unsigned long),
2411                 .mode           = 0644,
2412                 .proc_handler   = proc_dohung_task_timeout_secs,
2413                 .extra2         = &hung_task_timeout_max,
2414         },
2415         {
2416                 .procname       = "hung_task_check_interval_secs",
2417                 .data           = &sysctl_hung_task_check_interval_secs,
2418                 .maxlen         = sizeof(unsigned long),
2419                 .mode           = 0644,
2420                 .proc_handler   = proc_dohung_task_timeout_secs,
2421                 .extra2         = &hung_task_timeout_max,
2422         },
2423         {
2424                 .procname       = "hung_task_warnings",
2425                 .data           = &sysctl_hung_task_warnings,
2426                 .maxlen         = sizeof(int),
2427                 .mode           = 0644,
2428                 .proc_handler   = proc_dointvec_minmax,
2429                 .extra1         = &neg_one,
2430         },
2431 #endif
2432 #ifdef CONFIG_RT_MUTEXES
2433         {
2434                 .procname       = "max_lock_depth",
2435                 .data           = &max_lock_depth,
2436                 .maxlen         = sizeof(int),
2437                 .mode           = 0644,
2438                 .proc_handler   = proc_dointvec,
2439         },
2440 #endif
2441         {
2442                 .procname       = "poweroff_cmd",
2443                 .data           = &poweroff_cmd,
2444                 .maxlen         = POWEROFF_CMD_PATH_LEN,
2445                 .mode           = 0644,
2446                 .proc_handler   = proc_dostring,
2447         },
2448 #ifdef CONFIG_KEYS
2449         {
2450                 .procname       = "keys",
2451                 .mode           = 0555,
2452                 .child          = key_sysctls,
2453         },
2454 #endif
2455 #ifdef CONFIG_PERF_EVENTS
2456         /*
2457          * User-space scripts rely on the existence of this file
2458          * as a feature check for perf_events being enabled.
2459          *
2460          * So it's an ABI, do not remove!
2461          */
2462         {
2463                 .procname       = "perf_event_paranoid",
2464                 .data           = &sysctl_perf_event_paranoid,
2465                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
2466                 .mode           = 0644,
2467                 .proc_handler   = proc_dointvec,
2468         },
2469         {
2470                 .procname       = "perf_event_mlock_kb",
2471                 .data           = &sysctl_perf_event_mlock,
2472                 .maxlen         = sizeof(sysctl_perf_event_mlock),
2473                 .mode           = 0644,
2474                 .proc_handler   = proc_dointvec,
2475         },
2476         {
2477                 .procname       = "perf_event_max_sample_rate",
2478                 .data           = &sysctl_perf_event_sample_rate,
2479                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
2480                 .mode           = 0644,
2481                 .proc_handler   = perf_proc_update_handler,
2482                 .extra1         = SYSCTL_ONE,
2483         },
2484         {
2485                 .procname       = "perf_cpu_time_max_percent",
2486                 .data           = &sysctl_perf_cpu_time_max_percent,
2487                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
2488                 .mode           = 0644,
2489                 .proc_handler   = perf_cpu_time_max_percent_handler,
2490                 .extra1         = SYSCTL_ZERO,
2491                 .extra2         = &one_hundred,
2492         },
2493         {
2494                 .procname       = "perf_event_max_stack",
2495                 .data           = &sysctl_perf_event_max_stack,
2496                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
2497                 .mode           = 0644,
2498                 .proc_handler   = perf_event_max_stack_handler,
2499                 .extra1         = SYSCTL_ZERO,
2500                 .extra2         = &six_hundred_forty_kb,
2501         },
2502         {
2503                 .procname       = "perf_event_max_contexts_per_stack",
2504                 .data           = &sysctl_perf_event_max_contexts_per_stack,
2505                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
2506                 .mode           = 0644,
2507                 .proc_handler   = perf_event_max_stack_handler,
2508                 .extra1         = SYSCTL_ZERO,
2509                 .extra2         = &one_thousand,
2510         },
2511 #endif
2512         {
2513                 .procname       = "panic_on_warn",
2514                 .data           = &panic_on_warn,
2515                 .maxlen         = sizeof(int),
2516                 .mode           = 0644,
2517                 .proc_handler   = proc_dointvec_minmax,
2518                 .extra1         = SYSCTL_ZERO,
2519                 .extra2         = SYSCTL_ONE,
2520         },
2521 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2522         {
2523                 .procname       = "timer_migration",
2524                 .data           = &sysctl_timer_migration,
2525                 .maxlen         = sizeof(unsigned int),
2526                 .mode           = 0644,
2527                 .proc_handler   = timer_migration_handler,
2528                 .extra1         = SYSCTL_ZERO,
2529                 .extra2         = SYSCTL_ONE,
2530         },
2531 #endif
2532 #ifdef CONFIG_BPF_SYSCALL
2533         {
2534                 .procname       = "unprivileged_bpf_disabled",
2535                 .data           = &sysctl_unprivileged_bpf_disabled,
2536                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
2537                 .mode           = 0644,
2538                 /* only handle a transition from default "0" to "1" */
2539                 .proc_handler   = proc_dointvec_minmax,
2540                 .extra1         = SYSCTL_ONE,
2541                 .extra2         = SYSCTL_ONE,
2542         },
2543         {
2544                 .procname       = "bpf_stats_enabled",
2545                 .data           = &bpf_stats_enabled_key.key,
2546                 .maxlen         = sizeof(bpf_stats_enabled_key),
2547                 .mode           = 0644,
2548                 .proc_handler   = bpf_stats_handler,
2549         },
2550 #endif
2551 #if defined(CONFIG_TREE_RCU)
2552         {
2553                 .procname       = "panic_on_rcu_stall",
2554                 .data           = &sysctl_panic_on_rcu_stall,
2555                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
2556                 .mode           = 0644,
2557                 .proc_handler   = proc_dointvec_minmax,
2558                 .extra1         = SYSCTL_ZERO,
2559                 .extra2         = SYSCTL_ONE,
2560         },
2561 #endif
2562 #if defined(CONFIG_TREE_RCU)
2563         {
2564                 .procname       = "max_rcu_stall_to_panic",
2565                 .data           = &sysctl_max_rcu_stall_to_panic,
2566                 .maxlen         = sizeof(sysctl_max_rcu_stall_to_panic),
2567                 .mode           = 0644,
2568                 .proc_handler   = proc_dointvec_minmax,
2569                 .extra1         = SYSCTL_ONE,
2570                 .extra2         = SYSCTL_INT_MAX,
2571         },
2572 #endif
2573 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2574         {
2575                 .procname       = "stack_erasing",
2576                 .data           = NULL,
2577                 .maxlen         = sizeof(int),
2578                 .mode           = 0600,
2579                 .proc_handler   = stack_erasing_sysctl,
2580                 .extra1         = SYSCTL_ZERO,
2581                 .extra2         = SYSCTL_ONE,
2582         },
2583 #endif
2584         { }
2585 };
2586
2587 static struct ctl_table vm_table[] = {
2588         {
2589                 .procname       = "overcommit_memory",
2590                 .data           = &sysctl_overcommit_memory,
2591                 .maxlen         = sizeof(sysctl_overcommit_memory),
2592                 .mode           = 0644,
2593                 .proc_handler   = overcommit_policy_handler,
2594                 .extra1         = SYSCTL_ZERO,
2595                 .extra2         = &two,
2596         },
2597         {
2598                 .procname       = "panic_on_oom",
2599                 .data           = &sysctl_panic_on_oom,
2600                 .maxlen         = sizeof(sysctl_panic_on_oom),
2601                 .mode           = 0644,
2602                 .proc_handler   = proc_dointvec_minmax,
2603                 .extra1         = SYSCTL_ZERO,
2604                 .extra2         = &two,
2605         },
2606         {
2607                 .procname       = "oom_kill_allocating_task",
2608                 .data           = &sysctl_oom_kill_allocating_task,
2609                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
2610                 .mode           = 0644,
2611                 .proc_handler   = proc_dointvec,
2612         },
2613         {
2614                 .procname       = "oom_dump_tasks",
2615                 .data           = &sysctl_oom_dump_tasks,
2616                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
2617                 .mode           = 0644,
2618                 .proc_handler   = proc_dointvec,
2619         },
2620         {
2621                 .procname       = "overcommit_ratio",
2622                 .data           = &sysctl_overcommit_ratio,
2623                 .maxlen         = sizeof(sysctl_overcommit_ratio),
2624                 .mode           = 0644,
2625                 .proc_handler   = overcommit_ratio_handler,
2626         },
2627         {
2628                 .procname       = "overcommit_kbytes",
2629                 .data           = &sysctl_overcommit_kbytes,
2630                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
2631                 .mode           = 0644,
2632                 .proc_handler   = overcommit_kbytes_handler,
2633         },
2634         {
2635                 .procname       = "page-cluster",
2636                 .data           = &page_cluster,
2637                 .maxlen         = sizeof(int),
2638                 .mode           = 0644,
2639                 .proc_handler   = proc_dointvec_minmax,
2640                 .extra1         = SYSCTL_ZERO,
2641         },
2642         {
2643                 .procname       = "dirty_background_ratio",
2644                 .data           = &dirty_background_ratio,
2645                 .maxlen         = sizeof(dirty_background_ratio),
2646                 .mode           = 0644,
2647                 .proc_handler   = dirty_background_ratio_handler,
2648                 .extra1         = SYSCTL_ZERO,
2649                 .extra2         = &one_hundred,
2650         },
2651         {
2652                 .procname       = "dirty_background_bytes",
2653                 .data           = &dirty_background_bytes,
2654                 .maxlen         = sizeof(dirty_background_bytes),
2655                 .mode           = 0644,
2656                 .proc_handler   = dirty_background_bytes_handler,
2657                 .extra1         = &one_ul,
2658         },
2659         {
2660                 .procname       = "dirty_ratio",
2661                 .data           = &vm_dirty_ratio,
2662                 .maxlen         = sizeof(vm_dirty_ratio),
2663                 .mode           = 0644,
2664                 .proc_handler   = dirty_ratio_handler,
2665                 .extra1         = SYSCTL_ZERO,
2666                 .extra2         = &one_hundred,
2667         },
2668         {
2669                 .procname       = "dirty_bytes",
2670                 .data           = &vm_dirty_bytes,
2671                 .maxlen         = sizeof(vm_dirty_bytes),
2672                 .mode           = 0644,
2673                 .proc_handler   = dirty_bytes_handler,
2674                 .extra1         = &dirty_bytes_min,
2675         },
2676         {
2677                 .procname       = "dirty_writeback_centisecs",
2678                 .data           = &dirty_writeback_interval,
2679                 .maxlen         = sizeof(dirty_writeback_interval),
2680                 .mode           = 0644,
2681                 .proc_handler   = dirty_writeback_centisecs_handler,
2682         },
2683         {
2684                 .procname       = "dirty_expire_centisecs",
2685                 .data           = &dirty_expire_interval,
2686                 .maxlen         = sizeof(dirty_expire_interval),
2687                 .mode           = 0644,
2688                 .proc_handler   = proc_dointvec_minmax,
2689                 .extra1         = SYSCTL_ZERO,
2690         },
2691         {
2692                 .procname       = "dirtytime_expire_seconds",
2693                 .data           = &dirtytime_expire_interval,
2694                 .maxlen         = sizeof(dirtytime_expire_interval),
2695                 .mode           = 0644,
2696                 .proc_handler   = dirtytime_interval_handler,
2697                 .extra1         = SYSCTL_ZERO,
2698         },
2699         {
2700                 .procname       = "swappiness",
2701                 .data           = &vm_swappiness,
2702                 .maxlen         = sizeof(vm_swappiness),
2703                 .mode           = 0644,
2704                 .proc_handler   = proc_dointvec_minmax,
2705                 .extra1         = SYSCTL_ZERO,
2706                 .extra2         = &two_hundred,
2707         },
2708 #ifdef CONFIG_HUGETLB_PAGE
2709         {
2710                 .procname       = "nr_hugepages",
2711                 .data           = NULL,
2712                 .maxlen         = sizeof(unsigned long),
2713                 .mode           = 0644,
2714                 .proc_handler   = hugetlb_sysctl_handler,
2715         },
2716 #ifdef CONFIG_NUMA
2717         {
2718                 .procname       = "nr_hugepages_mempolicy",
2719                 .data           = NULL,
2720                 .maxlen         = sizeof(unsigned long),
2721                 .mode           = 0644,
2722                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
2723         },
2724         {
2725                 .procname               = "numa_stat",
2726                 .data                   = &sysctl_vm_numa_stat,
2727                 .maxlen                 = sizeof(int),
2728                 .mode                   = 0644,
2729                 .proc_handler   = sysctl_vm_numa_stat_handler,
2730                 .extra1                 = SYSCTL_ZERO,
2731                 .extra2                 = SYSCTL_ONE,
2732         },
2733 #endif
2734          {
2735                 .procname       = "hugetlb_shm_group",
2736                 .data           = &sysctl_hugetlb_shm_group,
2737                 .maxlen         = sizeof(gid_t),
2738                 .mode           = 0644,
2739                 .proc_handler   = proc_dointvec,
2740          },
2741         {
2742                 .procname       = "nr_overcommit_hugepages",
2743                 .data           = NULL,
2744                 .maxlen         = sizeof(unsigned long),
2745                 .mode           = 0644,
2746                 .proc_handler   = hugetlb_overcommit_handler,
2747         },
2748 #endif
2749         {
2750                 .procname       = "lowmem_reserve_ratio",
2751                 .data           = &sysctl_lowmem_reserve_ratio,
2752                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
2753                 .mode           = 0644,
2754                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
2755         },
2756         {
2757                 .procname       = "drop_caches",
2758                 .data           = &sysctl_drop_caches,
2759                 .maxlen         = sizeof(int),
2760                 .mode           = 0200,
2761                 .proc_handler   = drop_caches_sysctl_handler,
2762                 .extra1         = SYSCTL_ONE,
2763                 .extra2         = &four,
2764         },
2765 #ifdef CONFIG_COMPACTION
2766         {
2767                 .procname       = "compact_memory",
2768                 .data           = &sysctl_compact_memory,
2769                 .maxlen         = sizeof(int),
2770                 .mode           = 0200,
2771                 .proc_handler   = sysctl_compaction_handler,
2772         },
2773         {
2774                 .procname       = "compaction_proactiveness",
2775                 .data           = &sysctl_compaction_proactiveness,
2776                 .maxlen         = sizeof(sysctl_compaction_proactiveness),
2777                 .mode           = 0644,
2778                 .proc_handler   = proc_dointvec_minmax,
2779                 .extra1         = SYSCTL_ZERO,
2780                 .extra2         = &one_hundred,
2781         },
2782         {
2783                 .procname       = "extfrag_threshold",
2784                 .data           = &sysctl_extfrag_threshold,
2785                 .maxlen         = sizeof(int),
2786                 .mode           = 0644,
2787                 .proc_handler   = proc_dointvec_minmax,
2788                 .extra1         = &min_extfrag_threshold,
2789                 .extra2         = &max_extfrag_threshold,
2790         },
2791         {
2792                 .procname       = "compact_unevictable_allowed",
2793                 .data           = &sysctl_compact_unevictable_allowed,
2794                 .maxlen         = sizeof(int),
2795                 .mode           = 0644,
2796                 .proc_handler   = proc_dointvec_minmax_warn_RT_change,
2797                 .extra1         = SYSCTL_ZERO,
2798                 .extra2         = SYSCTL_ONE,
2799         },
2800
2801 #endif /* CONFIG_COMPACTION */
2802         {
2803                 .procname       = "min_free_kbytes",
2804                 .data           = &min_free_kbytes,
2805                 .maxlen         = sizeof(min_free_kbytes),
2806                 .mode           = 0644,
2807                 .proc_handler   = min_free_kbytes_sysctl_handler,
2808                 .extra1         = SYSCTL_ZERO,
2809         },
2810         {
2811                 .procname       = "watermark_boost_factor",
2812                 .data           = &watermark_boost_factor,
2813                 .maxlen         = sizeof(watermark_boost_factor),
2814                 .mode           = 0644,
2815                 .proc_handler   = proc_dointvec_minmax,
2816                 .extra1         = SYSCTL_ZERO,
2817         },
2818         {
2819                 .procname       = "watermark_scale_factor",
2820                 .data           = &watermark_scale_factor,
2821                 .maxlen         = sizeof(watermark_scale_factor),
2822                 .mode           = 0644,
2823                 .proc_handler   = watermark_scale_factor_sysctl_handler,
2824                 .extra1         = SYSCTL_ONE,
2825                 .extra2         = &one_thousand,
2826         },
2827         {
2828                 .procname       = "percpu_pagelist_fraction",
2829                 .data           = &percpu_pagelist_fraction,
2830                 .maxlen         = sizeof(percpu_pagelist_fraction),
2831                 .mode           = 0644,
2832                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
2833                 .extra1         = SYSCTL_ZERO,
2834         },
2835         {
2836                 .procname       = "page_lock_unfairness",
2837                 .data           = &sysctl_page_lock_unfairness,
2838                 .maxlen         = sizeof(sysctl_page_lock_unfairness),
2839                 .mode           = 0644,
2840                 .proc_handler   = proc_dointvec_minmax,
2841                 .extra1         = SYSCTL_ZERO,
2842         },
2843 #ifdef CONFIG_MMU
2844         {
2845                 .procname       = "max_map_count",
2846                 .data           = &sysctl_max_map_count,
2847                 .maxlen         = sizeof(sysctl_max_map_count),
2848                 .mode           = 0644,
2849                 .proc_handler   = proc_dointvec_minmax,
2850                 .extra1         = SYSCTL_ZERO,
2851         },
2852 #else
2853         {
2854                 .procname       = "nr_trim_pages",
2855                 .data           = &sysctl_nr_trim_pages,
2856                 .maxlen         = sizeof(sysctl_nr_trim_pages),
2857                 .mode           = 0644,
2858                 .proc_handler   = proc_dointvec_minmax,
2859                 .extra1         = SYSCTL_ZERO,
2860         },
2861 #endif
2862         {
2863                 .procname       = "laptop_mode",
2864                 .data           = &laptop_mode,
2865                 .maxlen         = sizeof(laptop_mode),
2866                 .mode           = 0644,
2867                 .proc_handler   = proc_dointvec_jiffies,
2868         },
2869         {
2870                 .procname       = "block_dump",
2871                 .data           = &block_dump,
2872                 .maxlen         = sizeof(block_dump),
2873                 .mode           = 0644,
2874                 .proc_handler   = proc_dointvec_minmax,
2875                 .extra1         = SYSCTL_ZERO,
2876         },
2877         {
2878                 .procname       = "vfs_cache_pressure",
2879                 .data           = &sysctl_vfs_cache_pressure,
2880                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
2881                 .mode           = 0644,
2882                 .proc_handler   = proc_dointvec_minmax,
2883                 .extra1         = SYSCTL_ZERO,
2884         },
2885 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2886     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2887         {
2888                 .procname       = "legacy_va_layout",
2889                 .data           = &sysctl_legacy_va_layout,
2890                 .maxlen         = sizeof(sysctl_legacy_va_layout),
2891                 .mode           = 0644,
2892                 .proc_handler   = proc_dointvec_minmax,
2893                 .extra1         = SYSCTL_ZERO,
2894         },
2895 #endif
2896 #ifdef CONFIG_NUMA
2897         {
2898                 .procname       = "zone_reclaim_mode",
2899                 .data           = &node_reclaim_mode,
2900                 .maxlen         = sizeof(node_reclaim_mode),
2901                 .mode           = 0644,
2902                 .proc_handler   = proc_dointvec_minmax,
2903                 .extra1         = SYSCTL_ZERO,
2904         },
2905         {
2906                 .procname       = "min_unmapped_ratio",
2907                 .data           = &sysctl_min_unmapped_ratio,
2908                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
2909                 .mode           = 0644,
2910                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
2911                 .extra1         = SYSCTL_ZERO,
2912                 .extra2         = &one_hundred,
2913         },
2914         {
2915                 .procname       = "min_slab_ratio",
2916                 .data           = &sysctl_min_slab_ratio,
2917                 .maxlen         = sizeof(sysctl_min_slab_ratio),
2918                 .mode           = 0644,
2919                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
2920                 .extra1         = SYSCTL_ZERO,
2921                 .extra2         = &one_hundred,
2922         },
2923 #endif
2924 #ifdef CONFIG_SMP
2925         {
2926                 .procname       = "stat_interval",
2927                 .data           = &sysctl_stat_interval,
2928                 .maxlen         = sizeof(sysctl_stat_interval),
2929                 .mode           = 0644,
2930                 .proc_handler   = proc_dointvec_jiffies,
2931         },
2932         {
2933                 .procname       = "stat_refresh",
2934                 .data           = NULL,
2935                 .maxlen         = 0,
2936                 .mode           = 0600,
2937                 .proc_handler   = vmstat_refresh,
2938         },
2939 #endif
2940 #ifdef CONFIG_MMU
2941         {
2942                 .procname       = "mmap_min_addr",
2943                 .data           = &dac_mmap_min_addr,
2944                 .maxlen         = sizeof(unsigned long),
2945                 .mode           = 0644,
2946                 .proc_handler   = mmap_min_addr_handler,
2947         },
2948 #endif
2949 #ifdef CONFIG_NUMA
2950         {
2951                 .procname       = "numa_zonelist_order",
2952                 .data           = &numa_zonelist_order,
2953                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
2954                 .mode           = 0644,
2955                 .proc_handler   = numa_zonelist_order_handler,
2956         },
2957 #endif
2958 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
2959    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
2960         {
2961                 .procname       = "vdso_enabled",
2962 #ifdef CONFIG_X86_32
2963                 .data           = &vdso32_enabled,
2964                 .maxlen         = sizeof(vdso32_enabled),
2965 #else
2966                 .data           = &vdso_enabled,
2967                 .maxlen         = sizeof(vdso_enabled),
2968 #endif
2969                 .mode           = 0644,
2970                 .proc_handler   = proc_dointvec,
2971                 .extra1         = SYSCTL_ZERO,
2972         },
2973 #endif
2974 #ifdef CONFIG_HIGHMEM
2975         {
2976                 .procname       = "highmem_is_dirtyable",
2977                 .data           = &vm_highmem_is_dirtyable,
2978                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
2979                 .mode           = 0644,
2980                 .proc_handler   = proc_dointvec_minmax,
2981                 .extra1         = SYSCTL_ZERO,
2982                 .extra2         = SYSCTL_ONE,
2983         },
2984 #endif
2985 #ifdef CONFIG_MEMORY_FAILURE
2986         {
2987                 .procname       = "memory_failure_early_kill",
2988                 .data           = &sysctl_memory_failure_early_kill,
2989                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
2990                 .mode           = 0644,
2991                 .proc_handler   = proc_dointvec_minmax,
2992                 .extra1         = SYSCTL_ZERO,
2993                 .extra2         = SYSCTL_ONE,
2994         },
2995         {
2996                 .procname       = "memory_failure_recovery",
2997                 .data           = &sysctl_memory_failure_recovery,
2998                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
2999                 .mode           = 0644,
3000                 .proc_handler   = proc_dointvec_minmax,
3001                 .extra1         = SYSCTL_ZERO,
3002                 .extra2         = SYSCTL_ONE,
3003         },
3004 #endif
3005         {
3006                 .procname       = "user_reserve_kbytes",
3007                 .data           = &sysctl_user_reserve_kbytes,
3008                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
3009                 .mode           = 0644,
3010                 .proc_handler   = proc_doulongvec_minmax,
3011         },
3012         {
3013                 .procname       = "admin_reserve_kbytes",
3014                 .data           = &sysctl_admin_reserve_kbytes,
3015                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
3016                 .mode           = 0644,
3017                 .proc_handler   = proc_doulongvec_minmax,
3018         },
3019 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3020         {
3021                 .procname       = "mmap_rnd_bits",
3022                 .data           = &mmap_rnd_bits,
3023                 .maxlen         = sizeof(mmap_rnd_bits),
3024                 .mode           = 0600,
3025                 .proc_handler   = proc_dointvec_minmax,
3026                 .extra1         = (void *)&mmap_rnd_bits_min,
3027                 .extra2         = (void *)&mmap_rnd_bits_max,
3028         },
3029 #endif
3030 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3031         {
3032                 .procname       = "mmap_rnd_compat_bits",
3033                 .data           = &mmap_rnd_compat_bits,
3034                 .maxlen         = sizeof(mmap_rnd_compat_bits),
3035                 .mode           = 0600,
3036                 .proc_handler   = proc_dointvec_minmax,
3037                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
3038                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
3039         },
3040 #endif
3041 #ifdef CONFIG_USERFAULTFD
3042         {
3043                 .procname       = "unprivileged_userfaultfd",
3044                 .data           = &sysctl_unprivileged_userfaultfd,
3045                 .maxlen         = sizeof(sysctl_unprivileged_userfaultfd),
3046                 .mode           = 0644,
3047                 .proc_handler   = proc_dointvec_minmax,
3048                 .extra1         = SYSCTL_ZERO,
3049                 .extra2         = SYSCTL_ONE,
3050         },
3051 #endif
3052         { }
3053 };
3054
3055 static struct ctl_table fs_table[] = {
3056         {
3057                 .procname       = "inode-nr",
3058                 .data           = &inodes_stat,
3059                 .maxlen         = 2*sizeof(long),
3060                 .mode           = 0444,
3061                 .proc_handler   = proc_nr_inodes,
3062         },
3063         {
3064                 .procname       = "inode-state",
3065                 .data           = &inodes_stat,
3066                 .maxlen         = 7*sizeof(long),
3067                 .mode           = 0444,
3068                 .proc_handler   = proc_nr_inodes,
3069         },
3070         {
3071                 .procname       = "file-nr",
3072                 .data           = &files_stat,
3073                 .maxlen         = sizeof(files_stat),
3074                 .mode           = 0444,
3075                 .proc_handler   = proc_nr_files,
3076         },
3077         {
3078                 .procname       = "file-max",
3079                 .data           = &files_stat.max_files,
3080                 .maxlen         = sizeof(files_stat.max_files),
3081                 .mode           = 0644,
3082                 .proc_handler   = proc_doulongvec_minmax,
3083                 .extra1         = &zero_ul,
3084                 .extra2         = &long_max,
3085         },
3086         {
3087                 .procname       = "nr_open",
3088                 .data           = &sysctl_nr_open,
3089                 .maxlen         = sizeof(unsigned int),
3090                 .mode           = 0644,
3091                 .proc_handler   = proc_dointvec_minmax,
3092                 .extra1         = &sysctl_nr_open_min,
3093                 .extra2         = &sysctl_nr_open_max,
3094         },
3095         {
3096                 .procname       = "dentry-state",
3097                 .data           = &dentry_stat,
3098                 .maxlen         = 6*sizeof(long),
3099                 .mode           = 0444,
3100                 .proc_handler   = proc_nr_dentry,
3101         },
3102         {
3103                 .procname       = "overflowuid",
3104                 .data           = &fs_overflowuid,
3105                 .maxlen         = sizeof(int),
3106                 .mode           = 0644,
3107                 .proc_handler   = proc_dointvec_minmax,
3108                 .extra1         = &minolduid,
3109                 .extra2         = &maxolduid,
3110         },
3111         {
3112                 .procname       = "overflowgid",
3113                 .data           = &fs_overflowgid,
3114                 .maxlen         = sizeof(int),
3115                 .mode           = 0644,
3116                 .proc_handler   = proc_dointvec_minmax,
3117                 .extra1         = &minolduid,
3118                 .extra2         = &maxolduid,
3119         },
3120 #ifdef CONFIG_FILE_LOCKING
3121         {
3122                 .procname       = "leases-enable",
3123                 .data           = &leases_enable,
3124                 .maxlen         = sizeof(int),
3125                 .mode           = 0644,
3126                 .proc_handler   = proc_dointvec,
3127         },
3128 #endif
3129 #ifdef CONFIG_DNOTIFY
3130         {
3131                 .procname       = "dir-notify-enable",
3132                 .data           = &dir_notify_enable,
3133                 .maxlen         = sizeof(int),
3134                 .mode           = 0644,
3135                 .proc_handler   = proc_dointvec,
3136         },
3137 #endif
3138 #ifdef CONFIG_MMU
3139 #ifdef CONFIG_FILE_LOCKING
3140         {
3141                 .procname       = "lease-break-time",
3142                 .data           = &lease_break_time,
3143                 .maxlen         = sizeof(int),
3144                 .mode           = 0644,
3145                 .proc_handler   = proc_dointvec,
3146         },
3147 #endif
3148 #ifdef CONFIG_AIO
3149         {
3150                 .procname       = "aio-nr",
3151                 .data           = &aio_nr,
3152                 .maxlen         = sizeof(aio_nr),
3153                 .mode           = 0444,
3154                 .proc_handler   = proc_doulongvec_minmax,
3155         },
3156         {
3157                 .procname       = "aio-max-nr",
3158                 .data           = &aio_max_nr,
3159                 .maxlen         = sizeof(aio_max_nr),
3160                 .mode           = 0644,
3161                 .proc_handler   = proc_doulongvec_minmax,
3162         },
3163 #endif /* CONFIG_AIO */
3164 #ifdef CONFIG_INOTIFY_USER
3165         {
3166                 .procname       = "inotify",
3167                 .mode           = 0555,
3168                 .child          = inotify_table,
3169         },
3170 #endif
3171 #ifdef CONFIG_FANOTIFY
3172         {
3173                 .procname       = "fanotify",
3174                 .mode           = 0555,
3175                 .child          = fanotify_table,
3176         },
3177 #endif
3178 #ifdef CONFIG_EPOLL
3179         {
3180                 .procname       = "epoll",
3181                 .mode           = 0555,
3182                 .child          = epoll_table,
3183         },
3184 #endif
3185 #endif
3186         {
3187                 .procname       = "protected_symlinks",
3188                 .data           = &sysctl_protected_symlinks,
3189                 .maxlen         = sizeof(int),
3190                 .mode           = 0600,
3191                 .proc_handler   = proc_dointvec_minmax,
3192                 .extra1         = SYSCTL_ZERO,
3193                 .extra2         = SYSCTL_ONE,
3194         },
3195         {
3196                 .procname       = "protected_hardlinks",
3197                 .data           = &sysctl_protected_hardlinks,
3198                 .maxlen         = sizeof(int),
3199                 .mode           = 0600,
3200                 .proc_handler   = proc_dointvec_minmax,
3201                 .extra1         = SYSCTL_ZERO,
3202                 .extra2         = SYSCTL_ONE,
3203         },
3204         {
3205                 .procname       = "protected_fifos",
3206                 .data           = &sysctl_protected_fifos,
3207                 .maxlen         = sizeof(int),
3208                 .mode           = 0600,
3209                 .proc_handler   = proc_dointvec_minmax,
3210                 .extra1         = SYSCTL_ZERO,
3211                 .extra2         = &two,
3212         },
3213         {
3214                 .procname       = "protected_regular",
3215                 .data           = &sysctl_protected_regular,
3216                 .maxlen         = sizeof(int),
3217                 .mode           = 0600,
3218                 .proc_handler   = proc_dointvec_minmax,
3219                 .extra1         = SYSCTL_ZERO,
3220                 .extra2         = &two,
3221         },
3222         {
3223                 .procname       = "suid_dumpable",
3224                 .data           = &suid_dumpable,
3225                 .maxlen         = sizeof(int),
3226                 .mode           = 0644,
3227                 .proc_handler   = proc_dointvec_minmax_coredump,
3228                 .extra1         = SYSCTL_ZERO,
3229                 .extra2         = &two,
3230         },
3231 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3232         {
3233                 .procname       = "binfmt_misc",
3234                 .mode           = 0555,
3235                 .child          = sysctl_mount_point,
3236         },
3237 #endif
3238         {
3239                 .procname       = "pipe-max-size",
3240                 .data           = &pipe_max_size,
3241                 .maxlen         = sizeof(pipe_max_size),
3242                 .mode           = 0644,
3243                 .proc_handler   = proc_dopipe_max_size,
3244         },
3245         {
3246                 .procname       = "pipe-user-pages-hard",
3247                 .data           = &pipe_user_pages_hard,
3248                 .maxlen         = sizeof(pipe_user_pages_hard),
3249                 .mode           = 0644,
3250                 .proc_handler   = proc_doulongvec_minmax,
3251         },
3252         {
3253                 .procname       = "pipe-user-pages-soft",
3254                 .data           = &pipe_user_pages_soft,
3255                 .maxlen         = sizeof(pipe_user_pages_soft),
3256                 .mode           = 0644,
3257                 .proc_handler   = proc_doulongvec_minmax,
3258         },
3259         {
3260                 .procname       = "mount-max",
3261                 .data           = &sysctl_mount_max,
3262                 .maxlen         = sizeof(unsigned int),
3263                 .mode           = 0644,
3264                 .proc_handler   = proc_dointvec_minmax,
3265                 .extra1         = SYSCTL_ONE,
3266         },
3267         { }
3268 };
3269
3270 static struct ctl_table debug_table[] = {
3271 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3272         {
3273                 .procname       = "exception-trace",
3274                 .data           = &show_unhandled_signals,
3275                 .maxlen         = sizeof(int),
3276                 .mode           = 0644,
3277                 .proc_handler   = proc_dointvec
3278         },
3279 #endif
3280 #if defined(CONFIG_OPTPROBES)
3281         {
3282                 .procname       = "kprobes-optimization",
3283                 .data           = &sysctl_kprobes_optimization,
3284                 .maxlen         = sizeof(int),
3285                 .mode           = 0644,
3286                 .proc_handler   = proc_kprobes_optimization_handler,
3287                 .extra1         = SYSCTL_ZERO,
3288                 .extra2         = SYSCTL_ONE,
3289         },
3290 #endif
3291         { }
3292 };
3293
3294 static struct ctl_table dev_table[] = {
3295         { }
3296 };
3297
3298 static struct ctl_table sysctl_base_table[] = {
3299         {
3300                 .procname       = "kernel",
3301                 .mode           = 0555,
3302                 .child          = kern_table,
3303         },
3304         {
3305                 .procname       = "vm",
3306                 .mode           = 0555,
3307                 .child          = vm_table,
3308         },
3309         {
3310                 .procname       = "fs",
3311                 .mode           = 0555,
3312                 .child          = fs_table,
3313         },
3314         {
3315                 .procname       = "debug",
3316                 .mode           = 0555,
3317                 .child          = debug_table,
3318         },
3319         {
3320                 .procname       = "dev",
3321                 .mode           = 0555,
3322                 .child          = dev_table,
3323         },
3324         { }
3325 };
3326
3327 int __init sysctl_init(void)
3328 {
3329         struct ctl_table_header *hdr;
3330
3331         hdr = register_sysctl_table(sysctl_base_table);
3332         kmemleak_not_leak(hdr);
3333         return 0;
3334 }
3335 #endif /* CONFIG_SYSCTL */
3336 /*
3337  * No sense putting this after each symbol definition, twice,
3338  * exception granted :-)
3339  */
3340 EXPORT_SYMBOL(proc_dointvec);
3341 EXPORT_SYMBOL(proc_douintvec);
3342 EXPORT_SYMBOL(proc_dointvec_jiffies);
3343 EXPORT_SYMBOL(proc_dointvec_minmax);
3344 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3345 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3346 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3347 EXPORT_SYMBOL(proc_dostring);
3348 EXPORT_SYMBOL(proc_doulongvec_minmax);
3349 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3350 EXPORT_SYMBOL(proc_do_large_bitmap);