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
 152 #ifdef CONFIG_PROC_SYSCTL
 153
 154 /**
 155  * enum sysctl_writes_mode - supported sysctl write modes
 156  *
 157  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 158  *      to be written, and multiple writes on the same sysctl file descriptor
 159  *      will rewrite the sysctl value, regardless of file position. No warning
 160  *      is issued when the initial position is not 0.
 161  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 162  *      not 0.
 163  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 164  *      file position 0 and the value must be fully contained in the buffer
 165  *      sent to the write syscall. If dealing with strings respect the file
 166  *      position, but restrict this to the max length of the buffer, anything
 167  *      passed the max length will be ignored. Multiple writes will append
 168  *      to the buffer.
 169  *
 170  * These write modes control how current file position affects the behavior of
 171  * updating sysctl values through the proc interface on each write.
 172  */
 173 enum sysctl_writes_mode {
 174         SYSCTL_WRITES_LEGACY            = -1,
 175         SYSCTL_WRITES_WARN              = 0,
 176         SYSCTL_WRITES_STRICT            = 1,
 177 };
 178
 179 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 180 #endif /* CONFIG_PROC_SYSCTL */
 181
 182 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
 183     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
 184 int sysctl_legacy_va_layout;
 185 #endif
 186
 187 #ifdef CONFIG_SCHED_DEBUG
 188 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 189 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 190 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 191 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 192 #ifdef CONFIG_SMP
 193 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 194 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 195 #endif /* CONFIG_SMP */
 196 #endif /* CONFIG_SCHED_DEBUG */
 197
 198 #ifdef CONFIG_COMPACTION
 199 static int min_extfrag_threshold;
 200 static int max_extfrag_threshold = 1000;
 201 #endif
 202
 203 #endif /* CONFIG_SYSCTL */
 204
 205 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
 206 static int bpf_stats_handler(struct ctl_table *table, int write,
 207                              void __user *buffer, size_t *lenp,
 208                              loff_t *ppos)
 209 {
 210         struct static_key *key = (struct static_key *)table->data;
 211         static int saved_val;
 212         int val, ret;
 213         struct ctl_table tmp = {
 214                 .data   = &val,
 215                 .maxlen = sizeof(val),
 216                 .mode   = table->mode,
 217                 .extra1 = SYSCTL_ZERO,
 218                 .extra2 = SYSCTL_ONE,
 219         };
 220
 221         if (write && !capable(CAP_SYS_ADMIN))
 222                 return -EPERM;
 223
 224         mutex_lock(&bpf_stats_enabled_mutex);
 225         val = saved_val;
 226         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 227         if (write && !ret && val != saved_val) {
 228                 if (val)
 229                         static_key_slow_inc(key);
 230                 else
 231                         static_key_slow_dec(key);
 232                 saved_val = val;
 233         }
 234         mutex_unlock(&bpf_stats_enabled_mutex);
 235         return ret;
 236 }
 237 #endif
 238
 239 /*
 240  * /proc/sys support
 241  */
 242
 243 #ifdef CONFIG_PROC_SYSCTL
 244
 245 static int _proc_do_string(char *data, int maxlen, int write,
 246                 char *buffer, size_t *lenp, loff_t *ppos)
 247 {
 248         size_t len;
 249         char c, *p;
 250
 251         if (!data || !maxlen || !*lenp) {
 252                 *lenp = 0;
 253                 return 0;
 254         }
 255
 256         if (write) {
 257                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
 258                         /* Only continue writes not past the end of buffer. */
 259                         len = strlen(data);
 260                         if (len > maxlen - 1)
 261                                 len = maxlen - 1;
 262
 263                         if (*ppos > len)
 264                                 return 0;
 265                         len = *ppos;
 266                 } else {
 267                         /* Start writing from beginning of buffer. */
 268                         len = 0;
 269                 }
 270
 271                 *ppos += *lenp;
 272                 p = buffer;
 273                 while ((p - buffer) < *lenp && len < maxlen - 1) {
 274                         c = *(p++);
 275                         if (c == 0 || c == '\n')
 276                                 break;
 277                         data[len++] = c;
 278                 }
 279                 data[len] = 0;
 280         } else {
 281                 len = strlen(data);
 282                 if (len > maxlen)
 283                         len = maxlen;
 284
 285                 if (*ppos > len) {
 286                         *lenp = 0;
 287                         return 0;
 288                 }
 289
 290                 data += *ppos;
 291                 len  -= *ppos;
 292
 293                 if (len > *lenp)
 294                         len = *lenp;
 295                 if (len)
 296                         memcpy(buffer, data, len);
 297                 if (len < *lenp) {
 298                         buffer[len] = '\n';
 299                         len++;
 300                 }
 301                 *lenp = len;
 302                 *ppos += len;
 303         }
 304         return 0;
 305 }
 306
 307 static void warn_sysctl_write(struct ctl_table *table)
 308 {
 309         pr_warn_once("%s wrote to %s when file position was not 0!\n"
 310                 "This will not be supported in the future. To silence this\n"
 311                 "warning, set kernel.sysctl_writes_strict = -1\n",
 312                 current->comm, table->procname);
 313 }
 314
 315 /**
 316  * proc_first_pos_non_zero_ignore - check if first position is allowed
 317  * @ppos: file position
 318  * @table: the sysctl table
 319  *
 320  * Returns true if the first position is non-zero and the sysctl_writes_strict
 321  * mode indicates this is not allowed for numeric input types. String proc
 322  * handlers can ignore the return value.
 323  */
 324 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
 325                                            struct ctl_table *table)
 326 {
 327         if (!*ppos)
 328                 return false;
 329
 330         switch (sysctl_writes_strict) {
 331         case SYSCTL_WRITES_STRICT:
 332                 return true;
 333         case SYSCTL_WRITES_WARN:
 334                 warn_sysctl_write(table);
 335                 return false;
 336         default:
 337                 return false;
 338         }
 339 }
 340
 341 /**
 342  * proc_dostring - read a string sysctl
 343  * @table: the sysctl table
 344  * @write: %TRUE if this is a write to the sysctl file
 345  * @buffer: the user buffer
 346  * @lenp: the size of the user buffer
 347  * @ppos: file position
 348  *
 349  * Reads/writes a string from/to the user buffer. If the kernel
 350  * buffer provided is not large enough to hold the string, the
 351  * string is truncated. The copied string is %NULL-terminated.
 352  * If the string is being read by the user process, it is copied
 353  * and a newline '\n' is added. It is truncated if the buffer is
 354  * not large enough.
 355  *
 356  * Returns 0 on success.
 357  */
 358 int proc_dostring(struct ctl_table *table, int write,
 359                   void *buffer, size_t *lenp, loff_t *ppos)
 360 {
 361         if (write)
 362                 proc_first_pos_non_zero_ignore(ppos, table);
 363
 364         return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
 365                         ppos);
 366 }
 367
 368 static size_t proc_skip_spaces(char **buf)
 369 {
 370         size_t ret;
 371         char *tmp = skip_spaces(*buf);
 372         ret = tmp - *buf;
 373         *buf = tmp;
 374         return ret;
 375 }
 376
 377 static void proc_skip_char(char **buf, size_t *size, const char v)
 378 {
 379         while (*size) {
 380                 if (**buf != v)
 381                         break;
 382                 (*size)--;
 383                 (*buf)++;
 384         }
 385 }
 386
 387 /**
 388  * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
 389  *                   fail on overflow
 390  *
 391  * @cp: kernel buffer containing the string to parse
 392  * @endp: pointer to store the trailing characters
 393  * @base: the base to use
 394  * @res: where the parsed integer will be stored
 395  *
 396  * In case of success 0 is returned and @res will contain the parsed integer,
 397  * @endp will hold any trailing characters.
 398  * This function will fail the parse on overflow. If there wasn't an overflow
 399  * the function will defer the decision what characters count as invalid to the
 400  * caller.
 401  */
 402 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
 403                            unsigned long *res)
 404 {
 405         unsigned long long result;
 406         unsigned int rv;
 407
 408         cp = _parse_integer_fixup_radix(cp, &base);
 409         rv = _parse_integer(cp, base, &result);
 410         if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
 411                 return -ERANGE;
 412
 413         cp += rv;
 414
 415         if (endp)
 416                 *endp = (char *)cp;
 417
 418         *res = (unsigned long)result;
 419         return 0;
 420 }
 421
 422 #define TMPBUFLEN 22
 423 /**
 424  * proc_get_long - reads an ASCII formatted integer from a user buffer
 425  *
 426  * @buf: a kernel buffer
 427  * @size: size of the kernel buffer
 428  * @val: this is where the number will be stored
 429  * @neg: set to %TRUE if number is negative
 430  * @perm_tr: a vector which contains the allowed trailers
 431  * @perm_tr_len: size of the perm_tr vector
 432  * @tr: pointer to store the trailer character
 433  *
 434  * In case of success %0 is returned and @buf and @size are updated with
 435  * the amount of bytes read. If @tr is non-NULL and a trailing
 436  * character exists (size is non-zero after returning from this
 437  * function), @tr is updated with the trailing character.
 438  */
 439 static int proc_get_long(char **buf, size_t *size,
 440                           unsigned long *val, bool *neg,
 441                           const char *perm_tr, unsigned perm_tr_len, char *tr)
 442 {
 443         int len;
 444         char *p, tmp[TMPBUFLEN];
 445
 446         if (!*size)
 447                 return -EINVAL;
 448
 449         len = *size;
 450         if (len > TMPBUFLEN - 1)
 451                 len = TMPBUFLEN - 1;
 452
 453         memcpy(tmp, *buf, len);
 454
 455         tmp[len] = 0;
 456         p = tmp;
 457         if (*p == '-' && *size > 1) {
 458                 *neg = true;
 459                 p++;
 460         } else
 461                 *neg = false;
 462         if (!isdigit(*p))
 463                 return -EINVAL;
 464
 465         if (strtoul_lenient(p, &p, 0, val))
 466                 return -EINVAL;
 467
 468         len = p - tmp;
 469
 470         /* We don't know if the next char is whitespace thus we may accept
 471          * invalid integers (e.g. 1234...a) or two integers instead of one
 472          * (e.g. 123...1). So lets not allow such large numbers. */
 473         if (len == TMPBUFLEN - 1)
 474                 return -EINVAL;
 475
 476         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
 477                 return -EINVAL;
 478
 479         if (tr && (len < *size))
 480                 *tr = *p;
 481
 482         *buf += len;
 483         *size -= len;
 484
 485         return 0;
 486 }
 487
 488 /**
 489  * proc_put_long - converts an integer to a decimal ASCII formatted string
 490  *
 491  * @buf: the user buffer
 492  * @size: the size of the user buffer
 493  * @val: the integer to be converted
 494  * @neg: sign of the number, %TRUE for negative
 495  *
 496  * In case of success @buf and @size are updated with the amount of bytes
 497  * written.
 498  */
 499 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
 500 {
 501         int len;
 502         char tmp[TMPBUFLEN], *p = tmp;
 503
 504         sprintf(p, "%s%lu", neg ? "-" : "", val);
 505         len = strlen(tmp);
 506         if (len > *size)
 507                 len = *size;
 508         memcpy(*buf, tmp, len);
 509         *size -= len;
 510         *buf += len;
 511 }
 512 #undef TMPBUFLEN
 513
 514 static void proc_put_char(void **buf, size_t *size, char c)
 515 {
 516         if (*size) {
 517                 char **buffer = (char **)buf;
 518                 **buffer = c;
 519
 520                 (*size)--;
 521                 (*buffer)++;
 522                 *buf = *buffer;
 523         }
 524 }
 525
 526 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
 527                                  int *valp,
 528                                  int write, void *data)
 529 {
 530         if (write) {
 531                 if (*negp) {
 532                         if (*lvalp > (unsigned long) INT_MAX + 1)
 533                                 return -EINVAL;
 534                         *valp = -*lvalp;
 535                 } else {
 536                         if (*lvalp > (unsigned long) INT_MAX)
 537                                 return -EINVAL;
 538                         *valp = *lvalp;
 539                 }
 540         } else {
 541                 int val = *valp;
 542                 if (val < 0) {
 543                         *negp = true;
 544                         *lvalp = -(unsigned long)val;
 545                 } else {
 546                         *negp = false;
 547                         *lvalp = (unsigned long)val;
 548                 }
 549         }
 550         return 0;
 551 }
 552
 553 static int do_proc_douintvec_conv(unsigned long *lvalp,
 554                                   unsigned int *valp,
 555                                   int write, void *data)
 556 {
 557         if (write) {
 558                 if (*lvalp > UINT_MAX)
 559                         return -EINVAL;
 560                 *valp = *lvalp;
 561         } else {
 562                 unsigned int val = *valp;
 563                 *lvalp = (unsigned long)val;
 564         }
 565         return 0;
 566 }
 567
 568 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
 569
 570 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
 571                   int write, void *buffer,
 572                   size_t *lenp, loff_t *ppos,
 573                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 574                               int write, void *data),
 575                   void *data)
 576 {
 577         int *i, vleft, first = 1, err = 0;
 578         size_t left;
 579         char *p;
 580
 581         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 582                 *lenp = 0;
 583                 return 0;
 584         }
 585
 586         i = (int *) tbl_data;
 587         vleft = table->maxlen / sizeof(*i);
 588         left = *lenp;
 589
 590         if (!conv)
 591                 conv = do_proc_dointvec_conv;
 592
 593         if (write) {
 594                 if (proc_first_pos_non_zero_ignore(ppos, table))
 595                         goto out;
 596
 597                 if (left > PAGE_SIZE - 1)
 598                         left = PAGE_SIZE - 1;
 599                 p = buffer;
 600         }
 601
 602         for (; left && vleft--; i++, first=0) {
 603                 unsigned long lval;
 604                 bool neg;
 605
 606                 if (write) {
 607                         left -= proc_skip_spaces(&p);
 608
 609                         if (!left)
 610                                 break;
 611                         err = proc_get_long(&p, &left, &lval, &neg,
 612                                              proc_wspace_sep,
 613                                              sizeof(proc_wspace_sep), NULL);
 614                         if (err)
 615                                 break;
 616                         if (conv(&neg, &lval, i, 1, data)) {
 617                                 err = -EINVAL;
 618                                 break;
 619                         }
 620                 } else {
 621                         if (conv(&neg, &lval, i, 0, data)) {
 622                                 err = -EINVAL;
 623                                 break;
 624                         }
 625                         if (!first)
 626                                 proc_put_char(&buffer, &left, '\t');
 627                         proc_put_long(&buffer, &left, lval, neg);
 628                 }
 629         }
 630
 631         if (!write && !first && left && !err)
 632                 proc_put_char(&buffer, &left, '\n');
 633         if (write && !err && left)
 634                 left -= proc_skip_spaces(&p);
 635         if (write && first)
 636                 return err ? : -EINVAL;
 637         *lenp -= left;
 638 out:
 639         *ppos += *lenp;
 640         return err;
 641 }
 642
 643 static int do_proc_dointvec(struct ctl_table *table, int write,
 644                   void *buffer, size_t *lenp, loff_t *ppos,
 645                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 646                               int write, void *data),
 647                   void *data)
 648 {
 649         return __do_proc_dointvec(table->data, table, write,
 650                         buffer, lenp, ppos, conv, data);
 651 }
 652
 653 static int do_proc_douintvec_w(unsigned int *tbl_data,
 654                                struct ctl_table *table,
 655                                void *buffer,
 656                                size_t *lenp, loff_t *ppos,
 657                                int (*conv)(unsigned long *lvalp,
 658                                            unsigned int *valp,
 659                                            int write, void *data),
 660                                void *data)
 661 {
 662         unsigned long lval;
 663         int err = 0;
 664         size_t left;
 665         bool neg;
 666         char *p = buffer;
 667
 668         left = *lenp;
 669
 670         if (proc_first_pos_non_zero_ignore(ppos, table))
 671                 goto bail_early;
 672
 673         if (left > PAGE_SIZE - 1)
 674                 left = PAGE_SIZE - 1;
 675
 676         left -= proc_skip_spaces(&p);
 677         if (!left) {
 678                 err = -EINVAL;
 679                 goto out_free;
 680         }
 681
 682         err = proc_get_long(&p, &left, &lval, &neg,
 683                              proc_wspace_sep,
 684                              sizeof(proc_wspace_sep), NULL);
 685         if (err || neg) {
 686                 err = -EINVAL;
 687                 goto out_free;
 688         }
 689
 690         if (conv(&lval, tbl_data, 1, data)) {
 691                 err = -EINVAL;
 692                 goto out_free;
 693         }
 694
 695         if (!err && left)
 696                 left -= proc_skip_spaces(&p);
 697
 698 out_free:
 699         if (err)
 700                 return -EINVAL;
 701
 702         return 0;
 703
 704         /* This is in keeping with old __do_proc_dointvec() */
 705 bail_early:
 706         *ppos += *lenp;
 707         return err;
 708 }
 709
 710 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
 711                                size_t *lenp, loff_t *ppos,
 712                                int (*conv)(unsigned long *lvalp,
 713                                            unsigned int *valp,
 714                                            int write, void *data),
 715                                void *data)
 716 {
 717         unsigned long lval;
 718         int err = 0;
 719         size_t left;
 720
 721         left = *lenp;
 722
 723         if (conv(&lval, tbl_data, 0, data)) {
 724                 err = -EINVAL;
 725                 goto out;
 726         }
 727
 728         proc_put_long(&buffer, &left, lval, false);
 729         if (!left)
 730                 goto out;
 731
 732         proc_put_char(&buffer, &left, '\n');
 733
 734 out:
 735         *lenp -= left;
 736         *ppos += *lenp;
 737
 738         return err;
 739 }
 740
 741 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
 742                                int write, void *buffer,
 743                                size_t *lenp, loff_t *ppos,
 744                                int (*conv)(unsigned long *lvalp,
 745                                            unsigned int *valp,
 746                                            int write, void *data),
 747                                void *data)
 748 {
 749         unsigned int *i, vleft;
 750
 751         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 752                 *lenp = 0;
 753                 return 0;
 754         }
 755
 756         i = (unsigned int *) tbl_data;
 757         vleft = table->maxlen / sizeof(*i);
 758
 759         /*
 760          * Arrays are not supported, keep this simple. *Do not* add
 761          * support for them.
 762          */
 763         if (vleft != 1) {
 764                 *lenp = 0;
 765                 return -EINVAL;
 766         }
 767
 768         if (!conv)
 769                 conv = do_proc_douintvec_conv;
 770
 771         if (write)
 772                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
 773                                            conv, data);
 774         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
 775 }
 776
 777 static int do_proc_douintvec(struct ctl_table *table, int write,
 778                              void *buffer, size_t *lenp, loff_t *ppos,
 779                              int (*conv)(unsigned long *lvalp,
 780                                          unsigned int *valp,
 781                                          int write, void *data),
 782                              void *data)
 783 {
 784         return __do_proc_douintvec(table->data, table, write,
 785                                    buffer, lenp, ppos, conv, data);
 786 }
 787
 788 /**
 789  * proc_dointvec - read a vector of integers
 790  * @table: the sysctl table
 791  * @write: %TRUE if this is a write to the sysctl file
 792  * @buffer: the user buffer
 793  * @lenp: the size of the user buffer
 794  * @ppos: file position
 795  *
 796  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 797  * values from/to the user buffer, treated as an ASCII string.
 798  *
 799  * Returns 0 on success.
 800  */
 801 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
 802                   size_t *lenp, loff_t *ppos)
 803 {
 804         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
 805 }
 806
 807 #ifdef CONFIG_COMPACTION
 808 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
 809                 int write, void *buffer, size_t *lenp, loff_t *ppos)
 810 {
 811         int ret, old;
 812
 813         if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
 814                 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 815
 816         old = *(int *)table->data;
 817         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 818         if (ret)
 819                 return ret;
 820         if (old != *(int *)table->data)
 821                 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
 822                              table->procname, current->comm,
 823                              task_pid_nr(current));
 824         return ret;
 825 }
 826 #endif
 827
 828 /**
 829  * proc_douintvec - read a vector of unsigned integers
 830  * @table: the sysctl table
 831  * @write: %TRUE if this is a write to the sysctl file
 832  * @buffer: the user buffer
 833  * @lenp: the size of the user buffer
 834  * @ppos: file position
 835  *
 836  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
 837  * values from/to the user buffer, treated as an ASCII string.
 838  *
 839  * Returns 0 on success.
 840  */
 841 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
 842                 size_t *lenp, loff_t *ppos)
 843 {
 844         return do_proc_douintvec(table, write, buffer, lenp, ppos,
 845                                  do_proc_douintvec_conv, NULL);
 846 }
 847
 848 /*
 849  * Taint values can only be increased
 850  * This means we can safely use a temporary.
 851  */
 852 static int proc_taint(struct ctl_table *table, int write,
 853                                void *buffer, size_t *lenp, loff_t *ppos)
 854 {
 855         struct ctl_table t;
 856         unsigned long tmptaint = get_taint();
 857         int err;
 858
 859         if (write && !capable(CAP_SYS_ADMIN))
 860                 return -EPERM;
 861
 862         t = *table;
 863         t.data = &tmptaint;
 864         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
 865         if (err < 0)
 866                 return err;
 867
 868         if (write) {
 869                 /*
 870                  * Poor man's atomic or. Not worth adding a primitive
 871                  * to everyone's atomic.h for this
 872                  */
 873                 int i;
 874                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
 875                         if ((tmptaint >> i) & 1)
 876                                 add_taint(i, LOCKDEP_STILL_OK);
 877                 }
 878         }
 879
 880         return err;
 881 }
 882
 883 #ifdef CONFIG_PRINTK
 884 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 885                                 void *buffer, size_t *lenp, loff_t *ppos)
 886 {
 887         if (write && !capable(CAP_SYS_ADMIN))
 888                 return -EPERM;
 889
 890         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 891 }
 892 #endif
 893
 894 /**
 895  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
 896  * @min: pointer to minimum allowable value
 897  * @max: pointer to maximum allowable value
 898  *
 899  * The do_proc_dointvec_minmax_conv_param structure provides the
 900  * minimum and maximum values for doing range checking for those sysctl
 901  * parameters that use the proc_dointvec_minmax() handler.
 902  */
 903 struct do_proc_dointvec_minmax_conv_param {
 904         int *min;
 905         int *max;
 906 };
 907
 908 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
 909                                         int *valp,
 910                                         int write, void *data)
 911 {
 912         int tmp, ret;
 913         struct do_proc_dointvec_minmax_conv_param *param = data;
 914         /*
 915          * If writing, first do so via a temporary local int so we can
 916          * bounds-check it before touching *valp.
 917          */
 918         int *ip = write ? &tmp : valp;
 919
 920         ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
 921         if (ret)
 922                 return ret;
 923
 924         if (write) {
 925                 if ((param->min && *param->min > tmp) ||
 926                     (param->max && *param->max < tmp))
 927                         return -EINVAL;
 928                 *valp = tmp;
 929         }
 930
 931         return 0;
 932 }
 933
 934 /**
 935  * proc_dointvec_minmax - read a vector of integers with min/max values
 936  * @table: the sysctl table
 937  * @write: %TRUE if this is a write to the sysctl file
 938  * @buffer: the user buffer
 939  * @lenp: the size of the user buffer
 940  * @ppos: file position
 941  *
 942  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 943  * values from/to the user buffer, treated as an ASCII string.
 944  *
 945  * This routine will ensure the values are within the range specified by
 946  * table->extra1 (min) and table->extra2 (max).
 947  *
 948  * Returns 0 on success or -EINVAL on write when the range check fails.
 949  */
 950 int proc_dointvec_minmax(struct ctl_table *table, int write,
 951                   void *buffer, size_t *lenp, loff_t *ppos)
 952 {
 953         struct do_proc_dointvec_minmax_conv_param param = {
 954                 .min = (int *) table->extra1,
 955                 .max = (int *) table->extra2,
 956         };
 957         return do_proc_dointvec(table, write, buffer, lenp, ppos,
 958                                 do_proc_dointvec_minmax_conv, &param);
 959 }
 960
 961 /**
 962  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
 963  * @min: pointer to minimum allowable value
 964  * @max: pointer to maximum allowable value
 965  *
 966  * The do_proc_douintvec_minmax_conv_param structure provides the
 967  * minimum and maximum values for doing range checking for those sysctl
 968  * parameters that use the proc_douintvec_minmax() handler.
 969  */
 970 struct do_proc_douintvec_minmax_conv_param {
 971         unsigned int *min;
 972         unsigned int *max;
 973 };
 974
 975 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
 976                                          unsigned int *valp,
 977                                          int write, void *data)
 978 {
 979         int ret;
 980         unsigned int tmp;
 981         struct do_proc_douintvec_minmax_conv_param *param = data;
 982         /* write via temporary local uint for bounds-checking */
 983         unsigned int *up = write ? &tmp : valp;
 984
 985         ret = do_proc_douintvec_conv(lvalp, up, write, data);
 986         if (ret)
 987                 return ret;
 988
 989         if (write) {
 990                 if ((param->min && *param->min > tmp) ||
 991                     (param->max && *param->max < tmp))
 992                         return -ERANGE;
 993
 994                 *valp = tmp;
 995         }
 996
 997         return 0;
 998 }
 999
1000 /**
1001  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1002  * @table: the sysctl table
1003  * @write: %TRUE if this is a write to the sysctl file
1004  * @buffer: the user buffer
1005  * @lenp: the size of the user buffer
1006  * @ppos: file position
1007  *
1008  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1009  * values from/to the user buffer, treated as an ASCII string. Negative
1010  * strings are not allowed.
1011  *
1012  * This routine will ensure the values are within the range specified by
1013  * table->extra1 (min) and table->extra2 (max). There is a final sanity
1014  * check for UINT_MAX to avoid having to support wrap around uses from
1015  * userspace.
1016  *
1017  * Returns 0 on success or -ERANGE on write when the range check fails.
1018  */
1019 int proc_douintvec_minmax(struct ctl_table *table, int write,
1020                           void *buffer, size_t *lenp, loff_t *ppos)
1021 {
1022         struct do_proc_douintvec_minmax_conv_param param = {
1023                 .min = (unsigned int *) table->extra1,
1024                 .max = (unsigned int *) table->extra2,
1025         };
1026         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1027                                  do_proc_douintvec_minmax_conv, &param);
1028 }
1029
1030 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1031                                         unsigned int *valp,
1032                                         int write, void *data)
1033 {
1034         if (write) {
1035                 unsigned int val;
1036
1037                 val = round_pipe_size(*lvalp);
1038                 if (val == 0)
1039                         return -EINVAL;
1040
1041                 *valp = val;
1042         } else {
1043                 unsigned int val = *valp;
1044                 *lvalp = (unsigned long) val;
1045         }
1046
1047         return 0;
1048 }
1049
1050 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1051                                 void *buffer, size_t *lenp, loff_t *ppos)
1052 {
1053         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1054                                  do_proc_dopipe_max_size_conv, NULL);
1055 }
1056
1057 static void validate_coredump_safety(void)
1058 {
1059 #ifdef CONFIG_COREDUMP
1060         if (suid_dumpable == SUID_DUMP_ROOT &&
1061             core_pattern[0] != '/' && core_pattern[0] != '|') {
1062                 printk(KERN_WARNING
1063 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1064 "Pipe handler or fully qualified core dump path required.\n"
1065 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1066                 );
1067         }
1068 #endif
1069 }
1070
1071 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1072                 void *buffer, size_t *lenp, loff_t *ppos)
1073 {
1074         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1075         if (!error)
1076                 validate_coredump_safety();
1077         return error;
1078 }
1079
1080 #ifdef CONFIG_COREDUMP
1081 static int proc_dostring_coredump(struct ctl_table *table, int write,
1082                   void *buffer, size_t *lenp, loff_t *ppos)
1083 {
1084         int error = proc_dostring(table, write, buffer, lenp, ppos);
1085         if (!error)
1086                 validate_coredump_safety();
1087         return error;
1088 }
1089 #endif
1090
1091 #ifdef CONFIG_MAGIC_SYSRQ
1092 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1093                                 void *buffer, size_t *lenp, loff_t *ppos)
1094 {
1095         int tmp, ret;
1096
1097         tmp = sysrq_mask();
1098
1099         ret = __do_proc_dointvec(&tmp, table, write, buffer,
1100                                lenp, ppos, NULL, NULL);
1101         if (ret || !write)
1102                 return ret;
1103
1104         if (write)
1105                 sysrq_toggle_support(tmp);
1106
1107         return 0;
1108 }
1109 #endif
1110
1111 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1112                 int write, void *buffer, size_t *lenp, loff_t *ppos,
1113                 unsigned long convmul, unsigned long convdiv)
1114 {
1115         unsigned long *i, *min, *max;
1116         int vleft, first = 1, err = 0;
1117         size_t left;
1118         char *p;
1119
1120         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1121                 *lenp = 0;
1122                 return 0;
1123         }
1124
1125         i = (unsigned long *) data;
1126         min = (unsigned long *) table->extra1;
1127         max = (unsigned long *) table->extra2;
1128         vleft = table->maxlen / sizeof(unsigned long);
1129         left = *lenp;
1130
1131         if (write) {
1132                 if (proc_first_pos_non_zero_ignore(ppos, table))
1133                         goto out;
1134
1135                 if (left > PAGE_SIZE - 1)
1136                         left = PAGE_SIZE - 1;
1137                 p = buffer;
1138         }
1139
1140         for (; left && vleft--; i++, first = 0) {
1141                 unsigned long val;
1142
1143                 if (write) {
1144                         bool neg;
1145
1146                         left -= proc_skip_spaces(&p);
1147                         if (!left)
1148                                 break;
1149
1150                         err = proc_get_long(&p, &left, &val, &neg,
1151                                              proc_wspace_sep,
1152                                              sizeof(proc_wspace_sep), NULL);
1153                         if (err)
1154                                 break;
1155                         if (neg)
1156                                 continue;
1157                         val = convmul * val / convdiv;
1158                         if ((min && val < *min) || (max && val > *max)) {
1159                                 err = -EINVAL;
1160                                 break;
1161                         }
1162                         *i = val;
1163                 } else {
1164                         val = convdiv * (*i) / convmul;
1165                         if (!first)
1166                                 proc_put_char(&buffer, &left, '\t');
1167                         proc_put_long(&buffer, &left, val, false);
1168                 }
1169         }
1170
1171         if (!write && !first && left && !err)
1172                 proc_put_char(&buffer, &left, '\n');
1173         if (write && !err)
1174                 left -= proc_skip_spaces(&p);
1175         if (write && first)
1176                 return err ? : -EINVAL;
1177         *lenp -= left;
1178 out:
1179         *ppos += *lenp;
1180         return err;
1181 }
1182
1183 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1184                 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1185                 unsigned long convdiv)
1186 {
1187         return __do_proc_doulongvec_minmax(table->data, table, write,
1188                         buffer, lenp, ppos, convmul, convdiv);
1189 }
1190
1191 /**
1192  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1193  * @table: the sysctl table
1194  * @write: %TRUE if this is a write to the sysctl file
1195  * @buffer: the user buffer
1196  * @lenp: the size of the user buffer
1197  * @ppos: file position
1198  *
1199  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1200  * values from/to the user buffer, treated as an ASCII string.
1201  *
1202  * This routine will ensure the values are within the range specified by
1203  * table->extra1 (min) and table->extra2 (max).
1204  *
1205  * Returns 0 on success.
1206  */
1207 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1208                            void *buffer, size_t *lenp, loff_t *ppos)
1209 {
1210     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1211 }
1212
1213 /**
1214  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1215  * @table: the sysctl table
1216  * @write: %TRUE if this is a write to the sysctl file
1217  * @buffer: the user buffer
1218  * @lenp: the size of the user buffer
1219  * @ppos: file position
1220  *
1221  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1222  * values from/to the user buffer, treated as an ASCII string. The values
1223  * are treated as milliseconds, and converted to jiffies when they are stored.
1224  *
1225  * This routine will ensure the values are within the range specified by
1226  * table->extra1 (min) and table->extra2 (max).
1227  *
1228  * Returns 0 on success.
1229  */
1230 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1231                                       void *buffer, size_t *lenp, loff_t *ppos)
1232 {
1233     return do_proc_doulongvec_minmax(table, write, buffer,
1234                                      lenp, ppos, HZ, 1000l);
1235 }
1236
1237
1238 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1239                                          int *valp,
1240                                          int write, void *data)
1241 {
1242         if (write) {
1243                 if (*lvalp > INT_MAX / HZ)
1244                         return 1;
1245                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1246         } else {
1247                 int val = *valp;
1248                 unsigned long lval;
1249                 if (val < 0) {
1250                         *negp = true;
1251                         lval = -(unsigned long)val;
1252                 } else {
1253                         *negp = false;
1254                         lval = (unsigned long)val;
1255                 }
1256                 *lvalp = lval / HZ;
1257         }
1258         return 0;
1259 }
1260
1261 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1262                                                 int *valp,
1263                                                 int write, void *data)
1264 {
1265         if (write) {
1266                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1267                         return 1;
1268                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1269         } else {
1270                 int val = *valp;
1271                 unsigned long lval;
1272                 if (val < 0) {
1273                         *negp = true;
1274                         lval = -(unsigned long)val;
1275                 } else {
1276                         *negp = false;
1277                         lval = (unsigned long)val;
1278                 }
1279                 *lvalp = jiffies_to_clock_t(lval);
1280         }
1281         return 0;
1282 }
1283
1284 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1285                                             int *valp,
1286                                             int write, void *data)
1287 {
1288         if (write) {
1289                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1290
1291                 if (jif > INT_MAX)
1292                         return 1;
1293                 *valp = (int)jif;
1294         } else {
1295                 int val = *valp;
1296                 unsigned long lval;
1297                 if (val < 0) {
1298                         *negp = true;
1299                         lval = -(unsigned long)val;
1300                 } else {
1301                         *negp = false;
1302                         lval = (unsigned long)val;
1303                 }
1304                 *lvalp = jiffies_to_msecs(lval);
1305         }
1306         return 0;
1307 }
1308
1309 /**
1310  * proc_dointvec_jiffies - read a vector of integers as seconds
1311  * @table: the sysctl table
1312  * @write: %TRUE if this is a write to the sysctl file
1313  * @buffer: the user buffer
1314  * @lenp: the size of the user buffer
1315  * @ppos: file position
1316  *
1317  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1318  * values from/to the user buffer, treated as an ASCII string.
1319  * The values read are assumed to be in seconds, and are converted into
1320  * jiffies.
1321  *
1322  * Returns 0 on success.
1323  */
1324 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1325                           void *buffer, size_t *lenp, loff_t *ppos)
1326 {
1327     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1328                             do_proc_dointvec_jiffies_conv,NULL);
1329 }
1330
1331 /**
1332  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1333  * @table: the sysctl table
1334  * @write: %TRUE if this is a write to the sysctl file
1335  * @buffer: the user buffer
1336  * @lenp: the size of the user buffer
1337  * @ppos: pointer to the file position
1338  *
1339  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1340  * values from/to the user buffer, treated as an ASCII string.
1341  * The values read are assumed to be in 1/USER_HZ seconds, and
1342  * are converted into jiffies.
1343  *
1344  * Returns 0 on success.
1345  */
1346 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1347                                  void *buffer, size_t *lenp, loff_t *ppos)
1348 {
1349     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1350                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1351 }
1352
1353 /**
1354  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1355  * @table: the sysctl table
1356  * @write: %TRUE if this is a write to the sysctl file
1357  * @buffer: the user buffer
1358  * @lenp: the size of the user buffer
1359  * @ppos: file position
1360  * @ppos: the current position in the file
1361  *
1362  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1363  * values from/to the user buffer, treated as an ASCII string.
1364  * The values read are assumed to be in 1/1000 seconds, and
1365  * are converted into jiffies.
1366  *
1367  * Returns 0 on success.
1368  */
1369 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1370                 size_t *lenp, loff_t *ppos)
1371 {
1372         return do_proc_dointvec(table, write, buffer, lenp, ppos,
1373                                 do_proc_dointvec_ms_jiffies_conv, NULL);
1374 }
1375
1376 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1377                 size_t *lenp, loff_t *ppos)
1378 {
1379         struct pid *new_pid;
1380         pid_t tmp;
1381         int r;
1382
1383         tmp = pid_vnr(cad_pid);
1384
1385         r = __do_proc_dointvec(&tmp, table, write, buffer,
1386                                lenp, ppos, NULL, NULL);
1387         if (r || !write)
1388                 return r;
1389
1390         new_pid = find_get_pid(tmp);
1391         if (!new_pid)
1392                 return -ESRCH;
1393
1394         put_pid(xchg(&cad_pid, new_pid));
1395         return 0;
1396 }
1397
1398 /**
1399  * proc_do_large_bitmap - read/write from/to a large bitmap
1400  * @table: the sysctl table
1401  * @write: %TRUE if this is a write to the sysctl file
1402  * @buffer: the user buffer
1403  * @lenp: the size of the user buffer
1404  * @ppos: file position
1405  *
1406  * The bitmap is stored at table->data and the bitmap length (in bits)
1407  * in table->maxlen.
1408  *
1409  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1410  * large bitmaps may be represented in a compact manner. Writing into
1411  * the file will clear the bitmap then update it with the given input.
1412  *
1413  * Returns 0 on success.
1414  */
1415 int proc_do_large_bitmap(struct ctl_table *table, int write,
1416                          void *buffer, size_t *lenp, loff_t *ppos)
1417 {
1418         int err = 0;
1419         bool first = 1;
1420         size_t left = *lenp;
1421         unsigned long bitmap_len = table->maxlen;
1422         unsigned long *bitmap = *(unsigned long **) table->data;
1423         unsigned long *tmp_bitmap = NULL;
1424         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1425
1426         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1427                 *lenp = 0;
1428                 return 0;
1429         }
1430
1431         if (write) {
1432                 char *p = buffer;
1433                 size_t skipped = 0;
1434
1435                 if (left > PAGE_SIZE - 1) {
1436                         left = PAGE_SIZE - 1;
1437                         /* How much of the buffer we'll skip this pass */
1438                         skipped = *lenp - left;
1439                 }
1440
1441                 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1442                 if (!tmp_bitmap)
1443                         return -ENOMEM;
1444                 proc_skip_char(&p, &left, '\n');
1445                 while (!err && left) {
1446                         unsigned long val_a, val_b;
1447                         bool neg;
1448                         size_t saved_left;
1449
1450                         /* In case we stop parsing mid-number, we can reset */
1451                         saved_left = left;
1452                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1453                                              sizeof(tr_a), &c);
1454                         /*
1455                          * If we consumed the entirety of a truncated buffer or
1456                          * only one char is left (may be a "-"), then stop here,
1457                          * reset, & come back for more.
1458                          */
1459                         if ((left <= 1) && skipped) {
1460                                 left = saved_left;
1461                                 break;
1462                         }
1463
1464                         if (err)
1465                                 break;
1466                         if (val_a >= bitmap_len || neg) {
1467                                 err = -EINVAL;
1468                                 break;
1469                         }
1470
1471                         val_b = val_a;
1472                         if (left) {
1473                                 p++;
1474                                 left--;
1475                         }
1476
1477                         if (c == '-') {
1478                                 err = proc_get_long(&p, &left, &val_b,
1479                                                      &neg, tr_b, sizeof(tr_b),
1480                                                      &c);
1481                                 /*
1482                                  * If we consumed all of a truncated buffer or
1483                                  * then stop here, reset, & come back for more.
1484                                  */
1485                                 if (!left && skipped) {
1486                                         left = saved_left;
1487                                         break;
1488                                 }
1489
1490                                 if (err)
1491                                         break;
1492                                 if (val_b >= bitmap_len || neg ||
1493                                     val_a > val_b) {
1494                                         err = -EINVAL;
1495                                         break;
1496                                 }
1497                                 if (left) {
1498                                         p++;
1499                                         left--;
1500                                 }
1501                         }
1502
1503                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1504                         first = 0;
1505                         proc_skip_char(&p, &left, '\n');
1506                 }
1507                 left += skipped;
1508         } else {
1509                 unsigned long bit_a, bit_b = 0;
1510
1511                 while (left) {
1512                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1513                         if (bit_a >= bitmap_len)
1514                                 break;
1515                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
1516                                                    bit_a + 1) - 1;
1517
1518                         if (!first)
1519                                 proc_put_char(&buffer, &left, ',');
1520                         proc_put_long(&buffer, &left, bit_a, false);
1521                         if (bit_a != bit_b) {
1522                                 proc_put_char(&buffer, &left, '-');
1523                                 proc_put_long(&buffer, &left, bit_b, false);
1524                         }
1525
1526                         first = 0; bit_b++;
1527                 }
1528                 proc_put_char(&buffer, &left, '\n');
1529         }
1530
1531         if (!err) {
1532                 if (write) {
1533                         if (*ppos)
1534                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1535                         else
1536                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1537                 }
1538                 *lenp -= left;
1539                 *ppos += *lenp;
1540         }
1541
1542         bitmap_free(tmp_bitmap);
1543         return err;
1544 }
1545
1546 #else /* CONFIG_PROC_SYSCTL */
1547
1548 int proc_dostring(struct ctl_table *table, int write,
1549                   void *buffer, size_t *lenp, loff_t *ppos)
1550 {
1551         return -ENOSYS;
1552 }
1553
1554 int proc_dointvec(struct ctl_table *table, int write,
1555                   void *buffer, size_t *lenp, loff_t *ppos)
1556 {
1557         return -ENOSYS;
1558 }
1559
1560 int proc_douintvec(struct ctl_table *table, int write,
1561                   void *buffer, size_t *lenp, loff_t *ppos)
1562 {
1563         return -ENOSYS;
1564 }
1565
1566 int proc_dointvec_minmax(struct ctl_table *table, int write,
1567                     void *buffer, size_t *lenp, loff_t *ppos)
1568 {
1569         return -ENOSYS;
1570 }
1571
1572 int proc_douintvec_minmax(struct ctl_table *table, int write,
1573                           void *buffer, size_t *lenp, loff_t *ppos)
1574 {
1575         return -ENOSYS;
1576 }
1577
1578 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1579                     void *buffer, size_t *lenp, loff_t *ppos)
1580 {
1581         return -ENOSYS;
1582 }
1583
1584 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1585                     void *buffer, size_t *lenp, loff_t *ppos)
1586 {
1587         return -ENOSYS;
1588 }
1589
1590 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1591                              void *buffer, size_t *lenp, loff_t *ppos)
1592 {
1593         return -ENOSYS;
1594 }
1595
1596 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1597                     void *buffer, size_t *lenp, loff_t *ppos)
1598 {
1599         return -ENOSYS;
1600 }
1601
1602 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1603                                       void *buffer, size_t *lenp, loff_t *ppos)
1604 {
1605         return -ENOSYS;
1606 }
1607
1608 int proc_do_large_bitmap(struct ctl_table *table, int write,
1609                          void *buffer, size_t *lenp, loff_t *ppos)
1610 {
1611         return -ENOSYS;
1612 }
1613
1614 #endif /* CONFIG_PROC_SYSCTL */
1615
1616 #if defined(CONFIG_SYSCTL)
1617 int proc_do_static_key(struct ctl_table *table, int write,
1618                        void *buffer, size_t *lenp, loff_t *ppos)
1619 {
1620         struct static_key *key = (struct static_key *)table->data;
1621         static DEFINE_MUTEX(static_key_mutex);
1622         int val, ret;
1623         struct ctl_table tmp = {
1624                 .data   = &val,
1625                 .maxlen = sizeof(val),
1626                 .mode   = table->mode,
1627                 .extra1 = SYSCTL_ZERO,
1628                 .extra2 = SYSCTL_ONE,
1629         };
1630
1631         if (write && !capable(CAP_SYS_ADMIN))
1632                 return -EPERM;
1633
1634         mutex_lock(&static_key_mutex);
1635         val = static_key_enabled(key);
1636         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1637         if (write && !ret) {
1638                 if (val)
1639                         static_key_enable(key);
1640                 else
1641                         static_key_disable(key);
1642         }
1643         mutex_unlock(&static_key_mutex);
1644         return ret;
1645 }
1646
1647 static struct ctl_table kern_table[] = {
1648         {
1649                 .procname       = "sched_child_runs_first",
1650                 .data           = &sysctl_sched_child_runs_first,
1651                 .maxlen         = sizeof(unsigned int),
1652                 .mode           = 0644,
1653                 .proc_handler   = proc_dointvec,
1654         },
1655 #ifdef CONFIG_SCHED_DEBUG
1656         {
1657                 .procname       = "sched_min_granularity_ns",
1658                 .data           = &sysctl_sched_min_granularity,
1659                 .maxlen         = sizeof(unsigned int),
1660                 .mode           = 0644,
1661                 .proc_handler   = sched_proc_update_handler,
1662                 .extra1         = &min_sched_granularity_ns,
1663                 .extra2         = &max_sched_granularity_ns,
1664         },
1665         {
1666                 .procname       = "sched_latency_ns",
1667                 .data           = &sysctl_sched_latency,
1668                 .maxlen         = sizeof(unsigned int),
1669                 .mode           = 0644,
1670                 .proc_handler   = sched_proc_update_handler,
1671                 .extra1         = &min_sched_granularity_ns,
1672                 .extra2         = &max_sched_granularity_ns,
1673         },
1674         {
1675                 .procname       = "sched_wakeup_granularity_ns",
1676                 .data           = &sysctl_sched_wakeup_granularity,
1677                 .maxlen         = sizeof(unsigned int),
1678                 .mode           = 0644,
1679                 .proc_handler   = sched_proc_update_handler,
1680                 .extra1         = &min_wakeup_granularity_ns,
1681                 .extra2         = &max_wakeup_granularity_ns,
1682         },
1683 #ifdef CONFIG_SMP
1684         {
1685                 .procname       = "sched_tunable_scaling",
1686                 .data           = &sysctl_sched_tunable_scaling,
1687                 .maxlen         = sizeof(enum sched_tunable_scaling),
1688                 .mode           = 0644,
1689                 .proc_handler   = sched_proc_update_handler,
1690                 .extra1         = &min_sched_tunable_scaling,
1691                 .extra2         = &max_sched_tunable_scaling,
1692         },
1693         {
1694                 .procname       = "sched_migration_cost_ns",
1695                 .data           = &sysctl_sched_migration_cost,
1696                 .maxlen         = sizeof(unsigned int),
1697                 .mode           = 0644,
1698                 .proc_handler   = proc_dointvec,
1699         },
1700         {
1701                 .procname       = "sched_nr_migrate",
1702                 .data           = &sysctl_sched_nr_migrate,
1703                 .maxlen         = sizeof(unsigned int),
1704                 .mode           = 0644,
1705                 .proc_handler   = proc_dointvec,
1706         },
1707 #ifdef CONFIG_SCHEDSTATS
1708         {
1709                 .procname       = "sched_schedstats",
1710                 .data           = NULL,
1711                 .maxlen         = sizeof(unsigned int),
1712                 .mode           = 0644,
1713                 .proc_handler   = sysctl_schedstats,
1714                 .extra1         = SYSCTL_ZERO,
1715                 .extra2         = SYSCTL_ONE,
1716         },
1717 #endif /* CONFIG_SCHEDSTATS */
1718 #endif /* CONFIG_SMP */
1719 #ifdef CONFIG_NUMA_BALANCING
1720         {
1721                 .procname       = "numa_balancing_scan_delay_ms",
1722                 .data           = &sysctl_numa_balancing_scan_delay,
1723                 .maxlen         = sizeof(unsigned int),
1724                 .mode           = 0644,
1725                 .proc_handler   = proc_dointvec,
1726         },
1727         {
1728                 .procname       = "numa_balancing_scan_period_min_ms",
1729                 .data           = &sysctl_numa_balancing_scan_period_min,
1730                 .maxlen         = sizeof(unsigned int),
1731                 .mode           = 0644,
1732                 .proc_handler   = proc_dointvec,
1733         },
1734         {
1735                 .procname       = "numa_balancing_scan_period_max_ms",
1736                 .data           = &sysctl_numa_balancing_scan_period_max,
1737                 .maxlen         = sizeof(unsigned int),
1738                 .mode           = 0644,
1739                 .proc_handler   = proc_dointvec,
1740         },
1741         {
1742                 .procname       = "numa_balancing_scan_size_mb",
1743                 .data           = &sysctl_numa_balancing_scan_size,
1744                 .maxlen         = sizeof(unsigned int),
1745                 .mode           = 0644,
1746                 .proc_handler   = proc_dointvec_minmax,
1747                 .extra1         = SYSCTL_ONE,
1748         },
1749         {
1750                 .procname       = "numa_balancing",
1751                 .data           = NULL, /* filled in by handler */
1752                 .maxlen         = sizeof(unsigned int),
1753                 .mode           = 0644,
1754                 .proc_handler   = sysctl_numa_balancing,
1755                 .extra1         = SYSCTL_ZERO,
1756                 .extra2         = SYSCTL_ONE,
1757         },
1758 #endif /* CONFIG_NUMA_BALANCING */
1759 #endif /* CONFIG_SCHED_DEBUG */
1760         {
1761                 .procname       = "sched_rt_period_us",
1762                 .data           = &sysctl_sched_rt_period,
1763                 .maxlen         = sizeof(unsigned int),
1764                 .mode           = 0644,
1765                 .proc_handler   = sched_rt_handler,
1766         },
1767         {
1768                 .procname       = "sched_rt_runtime_us",
1769                 .data           = &sysctl_sched_rt_runtime,
1770                 .maxlen         = sizeof(int),
1771                 .mode           = 0644,
1772                 .proc_handler   = sched_rt_handler,
1773         },
1774         {
1775                 .procname       = "sched_rr_timeslice_ms",
1776                 .data           = &sysctl_sched_rr_timeslice,
1777                 .maxlen         = sizeof(int),
1778                 .mode           = 0644,
1779                 .proc_handler   = sched_rr_handler,
1780         },
1781 #ifdef CONFIG_UCLAMP_TASK
1782         {
1783                 .procname       = "sched_util_clamp_min",
1784                 .data           = &sysctl_sched_uclamp_util_min,
1785                 .maxlen         = sizeof(unsigned int),
1786                 .mode           = 0644,
1787                 .proc_handler   = sysctl_sched_uclamp_handler,
1788         },
1789         {
1790                 .procname       = "sched_util_clamp_max",
1791                 .data           = &sysctl_sched_uclamp_util_max,
1792                 .maxlen         = sizeof(unsigned int),
1793                 .mode           = 0644,
1794                 .proc_handler   = sysctl_sched_uclamp_handler,
1795         },
1796 #endif
1797 #ifdef CONFIG_SCHED_AUTOGROUP
1798         {
1799                 .procname       = "sched_autogroup_enabled",
1800                 .data           = &sysctl_sched_autogroup_enabled,
1801                 .maxlen         = sizeof(unsigned int),
1802                 .mode           = 0644,
1803                 .proc_handler   = proc_dointvec_minmax,
1804                 .extra1         = SYSCTL_ZERO,
1805                 .extra2         = SYSCTL_ONE,
1806         },
1807 #endif
1808 #ifdef CONFIG_CFS_BANDWIDTH
1809         {
1810                 .procname       = "sched_cfs_bandwidth_slice_us",
1811                 .data           = &sysctl_sched_cfs_bandwidth_slice,
1812                 .maxlen         = sizeof(unsigned int),
1813                 .mode           = 0644,
1814                 .proc_handler   = proc_dointvec_minmax,
1815                 .extra1         = SYSCTL_ONE,
1816         },
1817 #endif
1818 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1819         {
1820                 .procname       = "sched_energy_aware",
1821                 .data           = &sysctl_sched_energy_aware,
1822                 .maxlen         = sizeof(unsigned int),
1823                 .mode           = 0644,
1824                 .proc_handler   = sched_energy_aware_handler,
1825                 .extra1         = SYSCTL_ZERO,
1826                 .extra2         = SYSCTL_ONE,
1827         },
1828 #endif
1829 #ifdef CONFIG_PROVE_LOCKING
1830         {
1831                 .procname       = "prove_locking",
1832                 .data           = &prove_locking,
1833                 .maxlen         = sizeof(int),
1834                 .mode           = 0644,
1835                 .proc_handler   = proc_dointvec,
1836         },
1837 #endif
1838 #ifdef CONFIG_LOCK_STAT
1839         {
1840                 .procname       = "lock_stat",
1841                 .data           = &lock_stat,
1842                 .maxlen         = sizeof(int),
1843                 .mode           = 0644,
1844                 .proc_handler   = proc_dointvec,
1845         },
1846 #endif
1847         {
1848                 .procname       = "panic",
1849                 .data           = &panic_timeout,
1850                 .maxlen         = sizeof(int),
1851                 .mode           = 0644,
1852                 .proc_handler   = proc_dointvec,
1853         },
1854 #ifdef CONFIG_COREDUMP
1855         {
1856                 .procname       = "core_uses_pid",
1857                 .data           = &core_uses_pid,
1858                 .maxlen         = sizeof(int),
1859                 .mode           = 0644,
1860                 .proc_handler   = proc_dointvec,
1861         },
1862         {
1863                 .procname       = "core_pattern",
1864                 .data           = core_pattern,
1865                 .maxlen         = CORENAME_MAX_SIZE,
1866                 .mode           = 0644,
1867                 .proc_handler   = proc_dostring_coredump,
1868         },
1869         {
1870                 .procname       = "core_pipe_limit",
1871                 .data           = &core_pipe_limit,
1872                 .maxlen         = sizeof(unsigned int),
1873                 .mode           = 0644,
1874                 .proc_handler   = proc_dointvec,
1875         },
1876 #endif
1877 #ifdef CONFIG_PROC_SYSCTL
1878         {
1879                 .procname       = "tainted",
1880                 .maxlen         = sizeof(long),
1881                 .mode           = 0644,
1882                 .proc_handler   = proc_taint,
1883         },
1884         {
1885                 .procname       = "sysctl_writes_strict",
1886                 .data           = &sysctl_writes_strict,
1887                 .maxlen         = sizeof(int),
1888                 .mode           = 0644,
1889                 .proc_handler   = proc_dointvec_minmax,
1890                 .extra1         = &neg_one,
1891                 .extra2         = SYSCTL_ONE,
1892         },
1893 #endif
1894 #ifdef CONFIG_LATENCYTOP
1895         {
1896                 .procname       = "latencytop",
1897                 .data           = &latencytop_enabled,
1898                 .maxlen         = sizeof(int),
1899                 .mode           = 0644,
1900                 .proc_handler   = sysctl_latencytop,
1901         },
1902 #endif
1903 #ifdef CONFIG_BLK_DEV_INITRD
1904         {
1905                 .procname       = "real-root-dev",
1906                 .data           = &real_root_dev,
1907                 .maxlen         = sizeof(int),
1908                 .mode           = 0644,
1909                 .proc_handler   = proc_dointvec,
1910         },
1911 #endif
1912         {
1913                 .procname       = "print-fatal-signals",
1914                 .data           = &print_fatal_signals,
1915                 .maxlen         = sizeof(int),
1916                 .mode           = 0644,
1917                 .proc_handler   = proc_dointvec,
1918         },
1919 #ifdef CONFIG_SPARC
1920         {
1921                 .procname       = "reboot-cmd",
1922                 .data           = reboot_command,
1923                 .maxlen         = 256,
1924                 .mode           = 0644,
1925                 .proc_handler   = proc_dostring,
1926         },
1927         {
1928                 .procname       = "stop-a",
1929                 .data           = &stop_a_enabled,
1930                 .maxlen         = sizeof (int),
1931                 .mode           = 0644,
1932                 .proc_handler   = proc_dointvec,
1933         },
1934         {
1935                 .procname       = "scons-poweroff",
1936                 .data           = &scons_pwroff,
1937                 .maxlen         = sizeof (int),
1938                 .mode           = 0644,
1939                 .proc_handler   = proc_dointvec,
1940         },
1941 #endif
1942 #ifdef CONFIG_SPARC64
1943         {
1944                 .procname       = "tsb-ratio",
1945                 .data           = &sysctl_tsb_ratio,
1946                 .maxlen         = sizeof (int),
1947                 .mode           = 0644,
1948                 .proc_handler   = proc_dointvec,
1949         },
1950 #endif
1951 #ifdef CONFIG_PARISC
1952         {
1953                 .procname       = "soft-power",
1954                 .data           = &pwrsw_enabled,
1955                 .maxlen         = sizeof (int),
1956                 .mode           = 0644,
1957                 .proc_handler   = proc_dointvec,
1958         },
1959 #endif
1960 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1961         {
1962                 .procname       = "unaligned-trap",
1963                 .data           = &unaligned_enabled,
1964                 .maxlen         = sizeof (int),
1965                 .mode           = 0644,
1966                 .proc_handler   = proc_dointvec,
1967         },
1968 #endif
1969         {
1970                 .procname       = "ctrl-alt-del",
1971                 .data           = &C_A_D,
1972                 .maxlen         = sizeof(int),
1973                 .mode           = 0644,
1974                 .proc_handler   = proc_dointvec,
1975         },
1976 #ifdef CONFIG_FUNCTION_TRACER
1977         {
1978                 .procname       = "ftrace_enabled",
1979                 .data           = &ftrace_enabled,
1980                 .maxlen         = sizeof(int),
1981                 .mode           = 0644,
1982                 .proc_handler   = ftrace_enable_sysctl,
1983         },
1984 #endif
1985 #ifdef CONFIG_STACK_TRACER
1986         {
1987                 .procname       = "stack_tracer_enabled",
1988                 .data           = &stack_tracer_enabled,
1989                 .maxlen         = sizeof(int),
1990                 .mode           = 0644,
1991                 .proc_handler   = stack_trace_sysctl,
1992         },
1993 #endif
1994 #ifdef CONFIG_TRACING
1995         {
1996                 .procname       = "ftrace_dump_on_oops",
1997                 .data           = &ftrace_dump_on_oops,
1998                 .maxlen         = sizeof(int),
1999                 .mode           = 0644,
2000                 .proc_handler   = proc_dointvec,
2001         },
2002         {
2003                 .procname       = "traceoff_on_warning",
2004                 .data           = &__disable_trace_on_warning,
2005                 .maxlen         = sizeof(__disable_trace_on_warning),
2006                 .mode           = 0644,
2007                 .proc_handler   = proc_dointvec,
2008         },
2009         {
2010                 .procname       = "tracepoint_printk",
2011                 .data           = &tracepoint_printk,
2012                 .maxlen         = sizeof(tracepoint_printk),
2013                 .mode           = 0644,
2014                 .proc_handler   = tracepoint_printk_sysctl,
2015         },
2016 #endif
2017 #ifdef CONFIG_KEXEC_CORE
2018         {
2019                 .procname       = "kexec_load_disabled",
2020                 .data           = &kexec_load_disabled,
2021                 .maxlen         = sizeof(int),
2022                 .mode           = 0644,
2023                 /* only handle a transition from default "0" to "1" */
2024                 .proc_handler   = proc_dointvec_minmax,
2025                 .extra1         = SYSCTL_ONE,
2026                 .extra2         = SYSCTL_ONE,
2027         },
2028 #endif
2029 #ifdef CONFIG_MODULES
2030         {
2031                 .procname       = "modprobe",
2032                 .data           = &modprobe_path,
2033                 .maxlen         = KMOD_PATH_LEN,
2034                 .mode           = 0644,
2035                 .proc_handler   = proc_dostring,
2036         },
2037         {
2038                 .procname       = "modules_disabled",
2039                 .data           = &modules_disabled,
2040                 .maxlen         = sizeof(int),
2041                 .mode           = 0644,
2042                 /* only handle a transition from default "0" to "1" */
2043                 .proc_handler   = proc_dointvec_minmax,
2044                 .extra1         = SYSCTL_ONE,
2045                 .extra2         = SYSCTL_ONE,
2046         },
2047 #endif
2048 #ifdef CONFIG_UEVENT_HELPER
2049         {
2050                 .procname       = "hotplug",
2051                 .data           = &uevent_helper,
2052                 .maxlen         = UEVENT_HELPER_PATH_LEN,
2053                 .mode           = 0644,
2054                 .proc_handler   = proc_dostring,
2055         },
2056 #endif
2057 #ifdef CONFIG_CHR_DEV_SG
2058         {
2059                 .procname       = "sg-big-buff",
2060                 .data           = &sg_big_buff,
2061                 .maxlen         = sizeof (int),
2062                 .mode           = 0444,
2063                 .proc_handler   = proc_dointvec,
2064         },
2065 #endif
2066 #ifdef CONFIG_BSD_PROCESS_ACCT
2067         {
2068                 .procname       = "acct",
2069                 .data           = &acct_parm,
2070                 .maxlen         = 3*sizeof(int),
2071                 .mode           = 0644,
2072                 .proc_handler   = proc_dointvec,
2073         },
2074 #endif
2075 #ifdef CONFIG_MAGIC_SYSRQ
2076         {
2077                 .procname       = "sysrq",
2078                 .data           = NULL,
2079                 .maxlen         = sizeof (int),
2080                 .mode           = 0644,
2081                 .proc_handler   = sysrq_sysctl_handler,
2082         },
2083 #endif
2084 #ifdef CONFIG_PROC_SYSCTL
2085         {
2086                 .procname       = "cad_pid",
2087                 .data           = NULL,
2088                 .maxlen         = sizeof (int),
2089                 .mode           = 0600,
2090                 .proc_handler   = proc_do_cad_pid,
2091         },
2092 #endif
2093         {
2094                 .procname       = "threads-max",
2095                 .data           = NULL,
2096                 .maxlen         = sizeof(int),
2097                 .mode           = 0644,
2098                 .proc_handler   = sysctl_max_threads,
2099         },
2100         {
2101                 .procname       = "random",
2102                 .mode           = 0555,
2103                 .child          = random_table,
2104         },
2105         {
2106                 .procname       = "usermodehelper",
2107                 .mode           = 0555,
2108                 .child          = usermodehelper_table,
2109         },
2110 #ifdef CONFIG_FW_LOADER_USER_HELPER
2111         {
2112                 .procname       = "firmware_config",
2113                 .mode           = 0555,
2114                 .child          = firmware_config_table,
2115         },
2116 #endif
2117         {
2118                 .procname       = "overflowuid",
2119                 .data           = &overflowuid,
2120                 .maxlen         = sizeof(int),
2121                 .mode           = 0644,
2122                 .proc_handler   = proc_dointvec_minmax,
2123                 .extra1         = &minolduid,
2124                 .extra2         = &maxolduid,
2125         },
2126         {
2127                 .procname       = "overflowgid",
2128                 .data           = &overflowgid,
2129                 .maxlen         = sizeof(int),
2130                 .mode           = 0644,
2131                 .proc_handler   = proc_dointvec_minmax,
2132                 .extra1         = &minolduid,
2133                 .extra2         = &maxolduid,
2134         },
2135 #ifdef CONFIG_S390
2136         {
2137                 .procname       = "userprocess_debug",
2138                 .data           = &show_unhandled_signals,
2139                 .maxlen         = sizeof(int),
2140                 .mode           = 0644,
2141                 .proc_handler   = proc_dointvec,
2142         },
2143 #endif
2144         {
2145                 .procname       = "pid_max",
2146                 .data           = &pid_max,
2147                 .maxlen         = sizeof (int),
2148                 .mode           = 0644,
2149                 .proc_handler   = proc_dointvec_minmax,
2150                 .extra1         = &pid_max_min,
2151                 .extra2         = &pid_max_max,
2152         },
2153         {
2154                 .procname       = "panic_on_oops",
2155                 .data           = &panic_on_oops,
2156                 .maxlen         = sizeof(int),
2157                 .mode           = 0644,
2158                 .proc_handler   = proc_dointvec,
2159         },
2160         {
2161                 .procname       = "panic_print",
2162                 .data           = &panic_print,
2163                 .maxlen         = sizeof(unsigned long),
2164                 .mode           = 0644,
2165                 .proc_handler   = proc_doulongvec_minmax,
2166         },
2167 #if defined CONFIG_PRINTK
2168         {
2169                 .procname       = "printk",
2170                 .data           = &console_loglevel,
2171                 .maxlen         = 4*sizeof(int),
2172                 .mode           = 0644,
2173                 .proc_handler   = proc_dointvec,
2174         },
2175         {
2176                 .procname       = "printk_ratelimit",
2177                 .data           = &printk_ratelimit_state.interval,
2178                 .maxlen         = sizeof(int),
2179                 .mode           = 0644,
2180                 .proc_handler   = proc_dointvec_jiffies,
2181         },
2182         {
2183                 .procname       = "printk_ratelimit_burst",
2184                 .data           = &printk_ratelimit_state.burst,
2185                 .maxlen         = sizeof(int),
2186                 .mode           = 0644,
2187                 .proc_handler   = proc_dointvec,
2188         },
2189         {
2190                 .procname       = "printk_delay",
2191                 .data           = &printk_delay_msec,
2192                 .maxlen         = sizeof(int),
2193                 .mode           = 0644,
2194                 .proc_handler   = proc_dointvec_minmax,
2195                 .extra1         = SYSCTL_ZERO,
2196                 .extra2         = &ten_thousand,
2197         },
2198         {
2199                 .procname       = "printk_devkmsg",
2200                 .data           = devkmsg_log_str,
2201                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
2202                 .mode           = 0644,
2203                 .proc_handler   = devkmsg_sysctl_set_loglvl,
2204         },
2205         {
2206                 .procname       = "dmesg_restrict",
2207                 .data           = &dmesg_restrict,
2208                 .maxlen         = sizeof(int),
2209                 .mode           = 0644,
2210                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2211                 .extra1         = SYSCTL_ZERO,
2212                 .extra2         = SYSCTL_ONE,
2213         },
2214         {
2215                 .procname       = "kptr_restrict",
2216                 .data           = &kptr_restrict,
2217                 .maxlen         = sizeof(int),
2218                 .mode           = 0644,
2219                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2220                 .extra1         = SYSCTL_ZERO,
2221                 .extra2         = &two,
2222         },
2223 #endif
2224         {
2225                 .procname       = "ngroups_max",
2226                 .data           = &ngroups_max,
2227                 .maxlen         = sizeof (int),
2228                 .mode           = 0444,
2229                 .proc_handler   = proc_dointvec,
2230         },
2231         {
2232                 .procname       = "cap_last_cap",
2233                 .data           = (void *)&cap_last_cap,
2234                 .maxlen         = sizeof(int),
2235                 .mode           = 0444,
2236                 .proc_handler   = proc_dointvec,
2237         },
2238 #if defined(CONFIG_LOCKUP_DETECTOR)
2239         {
2240                 .procname       = "watchdog",
2241                 .data           = &watchdog_user_enabled,
2242                 .maxlen         = sizeof(int),
2243                 .mode           = 0644,
2244                 .proc_handler   = proc_watchdog,
2245                 .extra1         = SYSCTL_ZERO,
2246                 .extra2         = SYSCTL_ONE,
2247         },
2248         {
2249                 .procname       = "watchdog_thresh",
2250                 .data           = &watchdog_thresh,
2251                 .maxlen         = sizeof(int),
2252                 .mode           = 0644,
2253                 .proc_handler   = proc_watchdog_thresh,
2254                 .extra1         = SYSCTL_ZERO,
2255                 .extra2         = &sixty,
2256         },
2257         {
2258                 .procname       = "nmi_watchdog",
2259                 .data           = &nmi_watchdog_user_enabled,
2260                 .maxlen         = sizeof(int),
2261                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
2262                 .proc_handler   = proc_nmi_watchdog,
2263                 .extra1         = SYSCTL_ZERO,
2264                 .extra2         = SYSCTL_ONE,
2265         },
2266         {
2267                 .procname       = "watchdog_cpumask",
2268                 .data           = &watchdog_cpumask_bits,
2269                 .maxlen         = NR_CPUS,
2270                 .mode           = 0644,
2271                 .proc_handler   = proc_watchdog_cpumask,
2272         },
2273 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2274         {
2275                 .procname       = "soft_watchdog",
2276                 .data           = &soft_watchdog_user_enabled,
2277                 .maxlen         = sizeof(int),
2278                 .mode           = 0644,
2279                 .proc_handler   = proc_soft_watchdog,
2280                 .extra1         = SYSCTL_ZERO,
2281                 .extra2         = SYSCTL_ONE,
2282         },
2283         {
2284                 .procname       = "softlockup_panic",
2285                 .data           = &softlockup_panic,
2286                 .maxlen         = sizeof(int),
2287                 .mode           = 0644,
2288                 .proc_handler   = proc_dointvec_minmax,
2289                 .extra1         = SYSCTL_ZERO,
2290                 .extra2         = SYSCTL_ONE,
2291         },
2292 #ifdef CONFIG_SMP
2293         {
2294                 .procname       = "softlockup_all_cpu_backtrace",
2295                 .data           = &sysctl_softlockup_all_cpu_backtrace,
2296                 .maxlen         = sizeof(int),
2297                 .mode           = 0644,
2298                 .proc_handler   = proc_dointvec_minmax,
2299                 .extra1         = SYSCTL_ZERO,
2300                 .extra2         = SYSCTL_ONE,
2301         },
2302 #endif /* CONFIG_SMP */
2303 #endif
2304 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2305         {
2306                 .procname       = "hardlockup_panic",
2307                 .data           = &hardlockup_panic,
2308                 .maxlen         = sizeof(int),
2309                 .mode           = 0644,
2310                 .proc_handler   = proc_dointvec_minmax,
2311                 .extra1         = SYSCTL_ZERO,
2312                 .extra2         = SYSCTL_ONE,
2313         },
2314 #ifdef CONFIG_SMP
2315         {
2316                 .procname       = "hardlockup_all_cpu_backtrace",
2317                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
2318                 .maxlen         = sizeof(int),
2319                 .mode           = 0644,
2320                 .proc_handler   = proc_dointvec_minmax,
2321                 .extra1         = SYSCTL_ZERO,
2322                 .extra2         = SYSCTL_ONE,
2323         },
2324 #endif /* CONFIG_SMP */
2325 #endif
2326 #endif
2327
2328 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2329         {
2330                 .procname       = "unknown_nmi_panic",
2331                 .data           = &unknown_nmi_panic,
2332                 .maxlen         = sizeof (int),
2333                 .mode           = 0644,
2334                 .proc_handler   = proc_dointvec,
2335         },
2336 #endif
2337
2338 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2339         defined(CONFIG_DEBUG_STACKOVERFLOW)
2340         {
2341                 .procname       = "panic_on_stackoverflow",
2342                 .data           = &sysctl_panic_on_stackoverflow,
2343                 .maxlen         = sizeof(int),
2344                 .mode           = 0644,
2345                 .proc_handler   = proc_dointvec,
2346         },
2347 #endif
2348 #if defined(CONFIG_X86)
2349         {
2350                 .procname       = "panic_on_unrecovered_nmi",
2351                 .data           = &panic_on_unrecovered_nmi,
2352                 .maxlen         = sizeof(int),
2353                 .mode           = 0644,
2354                 .proc_handler   = proc_dointvec,
2355         },
2356         {
2357                 .procname       = "panic_on_io_nmi",
2358                 .data           = &panic_on_io_nmi,
2359                 .maxlen         = sizeof(int),
2360                 .mode           = 0644,
2361                 .proc_handler   = proc_dointvec,
2362         },
2363         {
2364                 .procname       = "bootloader_type",
2365                 .data           = &bootloader_type,
2366                 .maxlen         = sizeof (int),
2367                 .mode           = 0444,
2368                 .proc_handler   = proc_dointvec,
2369         },
2370         {
2371                 .procname       = "bootloader_version",
2372                 .data           = &bootloader_version,
2373                 .maxlen         = sizeof (int),
2374                 .mode           = 0444,
2375                 .proc_handler   = proc_dointvec,
2376         },
2377         {
2378                 .procname       = "io_delay_type",
2379                 .data           = &io_delay_type,
2380                 .maxlen         = sizeof(int),
2381                 .mode           = 0644,
2382                 .proc_handler   = proc_dointvec,
2383         },
2384 #endif
2385 #if defined(CONFIG_MMU)
2386         {
2387                 .procname       = "randomize_va_space",
2388                 .data           = &randomize_va_space,
2389                 .maxlen         = sizeof(int),
2390                 .mode           = 0644,
2391                 .proc_handler   = proc_dointvec,
2392         },
2393 #endif
2394 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2395         {
2396                 .procname       = "spin_retry",
2397                 .data           = &spin_retry,
2398                 .maxlen         = sizeof (int),
2399                 .mode           = 0644,
2400                 .proc_handler   = proc_dointvec,
2401         },
2402 #endif
2403 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2404         {
2405                 .procname       = "acpi_video_flags",
2406                 .data           = &acpi_realmode_flags,
2407                 .maxlen         = sizeof (unsigned long),
2408                 .mode           = 0644,
2409                 .proc_handler   = proc_doulongvec_minmax,
2410         },
2411 #endif
2412 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2413         {
2414                 .procname       = "ignore-unaligned-usertrap",
2415                 .data           = &no_unaligned_warning,
2416                 .maxlen         = sizeof (int),
2417                 .mode           = 0644,
2418                 .proc_handler   = proc_dointvec,
2419         },
2420 #endif
2421 #ifdef CONFIG_IA64
2422         {
2423                 .procname       = "unaligned-dump-stack",
2424                 .data           = &unaligned_dump_stack,
2425                 .maxlen         = sizeof (int),
2426                 .mode           = 0644,
2427                 .proc_handler   = proc_dointvec,
2428         },
2429 #endif
2430 #ifdef CONFIG_DETECT_HUNG_TASK
2431         {
2432                 .procname       = "hung_task_panic",
2433                 .data           = &sysctl_hung_task_panic,
2434                 .maxlen         = sizeof(int),
2435                 .mode           = 0644,
2436                 .proc_handler   = proc_dointvec_minmax,
2437                 .extra1         = SYSCTL_ZERO,
2438                 .extra2         = SYSCTL_ONE,
2439         },
2440         {
2441                 .procname       = "hung_task_check_count",
2442                 .data           = &sysctl_hung_task_check_count,
2443                 .maxlen         = sizeof(int),
2444                 .mode           = 0644,
2445                 .proc_handler   = proc_dointvec_minmax,
2446                 .extra1         = SYSCTL_ZERO,
2447         },
2448         {
2449                 .procname       = "hung_task_timeout_secs",
2450                 .data           = &sysctl_hung_task_timeout_secs,
2451                 .maxlen         = sizeof(unsigned long),
2452                 .mode           = 0644,
2453                 .proc_handler   = proc_dohung_task_timeout_secs,
2454                 .extra2         = &hung_task_timeout_max,
2455         },
2456         {
2457                 .procname       = "hung_task_check_interval_secs",
2458                 .data           = &sysctl_hung_task_check_interval_secs,
2459                 .maxlen         = sizeof(unsigned long),
2460                 .mode           = 0644,
2461                 .proc_handler   = proc_dohung_task_timeout_secs,
2462                 .extra2         = &hung_task_timeout_max,
2463         },
2464         {
2465                 .procname       = "hung_task_warnings",
2466                 .data           = &sysctl_hung_task_warnings,
2467                 .maxlen         = sizeof(int),
2468                 .mode           = 0644,
2469                 .proc_handler   = proc_dointvec_minmax,
2470                 .extra1         = &neg_one,
2471         },
2472 #endif
2473 #ifdef CONFIG_RT_MUTEXES
2474         {
2475                 .procname       = "max_lock_depth",
2476                 .data           = &max_lock_depth,
2477                 .maxlen         = sizeof(int),
2478                 .mode           = 0644,
2479                 .proc_handler   = proc_dointvec,
2480         },
2481 #endif
2482         {
2483                 .procname       = "poweroff_cmd",
2484                 .data           = &poweroff_cmd,
2485                 .maxlen         = POWEROFF_CMD_PATH_LEN,
2486                 .mode           = 0644,
2487                 .proc_handler   = proc_dostring,
2488         },
2489 #ifdef CONFIG_KEYS
2490         {
2491                 .procname       = "keys",
2492                 .mode           = 0555,
2493                 .child          = key_sysctls,
2494         },
2495 #endif
2496 #ifdef CONFIG_PERF_EVENTS
2497         /*
2498          * User-space scripts rely on the existence of this file
2499          * as a feature check for perf_events being enabled.
2500          *
2501          * So it's an ABI, do not remove!
2502          */
2503         {
2504                 .procname       = "perf_event_paranoid",
2505                 .data           = &sysctl_perf_event_paranoid,
2506                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
2507                 .mode           = 0644,
2508                 .proc_handler   = proc_dointvec,
2509         },
2510         {
2511                 .procname       = "perf_event_mlock_kb",
2512                 .data           = &sysctl_perf_event_mlock,
2513                 .maxlen         = sizeof(sysctl_perf_event_mlock),
2514                 .mode           = 0644,
2515                 .proc_handler   = proc_dointvec,
2516         },
2517         {
2518                 .procname       = "perf_event_max_sample_rate",
2519                 .data           = &sysctl_perf_event_sample_rate,
2520                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
2521                 .mode           = 0644,
2522                 .proc_handler   = perf_proc_update_handler,
2523                 .extra1         = SYSCTL_ONE,
2524         },
2525         {
2526                 .procname       = "perf_cpu_time_max_percent",
2527                 .data           = &sysctl_perf_cpu_time_max_percent,
2528                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
2529                 .mode           = 0644,
2530                 .proc_handler   = perf_cpu_time_max_percent_handler,
2531                 .extra1         = SYSCTL_ZERO,
2532                 .extra2         = &one_hundred,
2533         },
2534         {
2535                 .procname       = "perf_event_max_stack",
2536                 .data           = &sysctl_perf_event_max_stack,
2537                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
2538                 .mode           = 0644,
2539                 .proc_handler   = perf_event_max_stack_handler,
2540                 .extra1         = SYSCTL_ZERO,
2541                 .extra2         = &six_hundred_forty_kb,
2542         },
2543         {
2544                 .procname       = "perf_event_max_contexts_per_stack",
2545                 .data           = &sysctl_perf_event_max_contexts_per_stack,
2546                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
2547                 .mode           = 0644,
2548                 .proc_handler   = perf_event_max_stack_handler,
2549                 .extra1         = SYSCTL_ZERO,
2550                 .extra2         = &one_thousand,
2551         },
2552 #endif
2553         {
2554                 .procname       = "panic_on_warn",
2555                 .data           = &panic_on_warn,
2556                 .maxlen         = sizeof(int),
2557                 .mode           = 0644,
2558                 .proc_handler   = proc_dointvec_minmax,
2559                 .extra1         = SYSCTL_ZERO,
2560                 .extra2         = SYSCTL_ONE,
2561         },
2562 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2563         {
2564                 .procname       = "timer_migration",
2565                 .data           = &sysctl_timer_migration,
2566                 .maxlen         = sizeof(unsigned int),
2567                 .mode           = 0644,
2568                 .proc_handler   = timer_migration_handler,
2569                 .extra1         = SYSCTL_ZERO,
2570                 .extra2         = SYSCTL_ONE,
2571         },
2572 #endif
2573 #ifdef CONFIG_BPF_SYSCALL
2574         {
2575                 .procname       = "unprivileged_bpf_disabled",
2576                 .data           = &sysctl_unprivileged_bpf_disabled,
2577                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
2578                 .mode           = 0644,
2579                 /* only handle a transition from default "0" to "1" */
2580                 .proc_handler   = proc_dointvec_minmax,
2581                 .extra1         = SYSCTL_ONE,
2582                 .extra2         = SYSCTL_ONE,
2583         },
2584         {
2585                 .procname       = "bpf_stats_enabled",
2586                 .data           = &bpf_stats_enabled_key.key,
2587                 .maxlen         = sizeof(bpf_stats_enabled_key),
2588                 .mode           = 0644,
2589                 .proc_handler   = bpf_stats_handler,
2590         },
2591 #endif
2592 #if defined(CONFIG_TREE_RCU)
2593         {
2594                 .procname       = "panic_on_rcu_stall",
2595                 .data           = &sysctl_panic_on_rcu_stall,
2596                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
2597                 .mode           = 0644,
2598                 .proc_handler   = proc_dointvec_minmax,
2599                 .extra1         = SYSCTL_ZERO,
2600                 .extra2         = SYSCTL_ONE,
2601         },
2602 #endif
2603 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2604         {
2605                 .procname       = "stack_erasing",
2606                 .data           = NULL,
2607                 .maxlen         = sizeof(int),
2608                 .mode           = 0600,
2609                 .proc_handler   = stack_erasing_sysctl,
2610                 .extra1         = SYSCTL_ZERO,
2611                 .extra2         = SYSCTL_ONE,
2612         },
2613 #endif
2614         { }
2615 };
2616
2617 static struct ctl_table vm_table[] = {
2618         {
2619                 .procname       = "overcommit_memory",
2620                 .data           = &sysctl_overcommit_memory,
2621                 .maxlen         = sizeof(sysctl_overcommit_memory),
2622                 .mode           = 0644,
2623                 .proc_handler   = proc_dointvec_minmax,
2624                 .extra1         = SYSCTL_ZERO,
2625                 .extra2         = &two,
2626         },
2627         {
2628                 .procname       = "panic_on_oom",
2629                 .data           = &sysctl_panic_on_oom,
2630                 .maxlen         = sizeof(sysctl_panic_on_oom),
2631                 .mode           = 0644,
2632                 .proc_handler   = proc_dointvec_minmax,
2633                 .extra1         = SYSCTL_ZERO,
2634                 .extra2         = &two,
2635         },
2636         {
2637                 .procname       = "oom_kill_allocating_task",
2638                 .data           = &sysctl_oom_kill_allocating_task,
2639                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
2640                 .mode           = 0644,
2641                 .proc_handler   = proc_dointvec,
2642         },
2643         {
2644                 .procname       = "oom_dump_tasks",
2645                 .data           = &sysctl_oom_dump_tasks,
2646                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
2647                 .mode           = 0644,
2648                 .proc_handler   = proc_dointvec,
2649         },
2650         {
2651                 .procname       = "overcommit_ratio",
2652                 .data           = &sysctl_overcommit_ratio,
2653                 .maxlen         = sizeof(sysctl_overcommit_ratio),
2654                 .mode           = 0644,
2655                 .proc_handler   = overcommit_ratio_handler,
2656         },
2657         {
2658                 .procname       = "overcommit_kbytes",
2659                 .data           = &sysctl_overcommit_kbytes,
2660                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
2661                 .mode           = 0644,
2662                 .proc_handler   = overcommit_kbytes_handler,
2663         },
2664         {
2665                 .procname       = "page-cluster",
2666                 .data           = &page_cluster,
2667                 .maxlen         = sizeof(int),
2668                 .mode           = 0644,
2669                 .proc_handler   = proc_dointvec_minmax,
2670                 .extra1         = SYSCTL_ZERO,
2671         },
2672         {
2673                 .procname       = "dirty_background_ratio",
2674                 .data           = &dirty_background_ratio,
2675                 .maxlen         = sizeof(dirty_background_ratio),
2676                 .mode           = 0644,
2677                 .proc_handler   = dirty_background_ratio_handler,
2678                 .extra1         = SYSCTL_ZERO,
2679                 .extra2         = &one_hundred,
2680         },
2681         {
2682                 .procname       = "dirty_background_bytes",
2683                 .data           = &dirty_background_bytes,
2684                 .maxlen         = sizeof(dirty_background_bytes),
2685                 .mode           = 0644,
2686                 .proc_handler   = dirty_background_bytes_handler,
2687                 .extra1         = &one_ul,
2688         },
2689         {
2690                 .procname       = "dirty_ratio",
2691                 .data           = &vm_dirty_ratio,
2692                 .maxlen         = sizeof(vm_dirty_ratio),
2693                 .mode           = 0644,
2694                 .proc_handler   = dirty_ratio_handler,
2695                 .extra1         = SYSCTL_ZERO,
2696                 .extra2         = &one_hundred,
2697         },
2698         {
2699                 .procname       = "dirty_bytes",
2700                 .data           = &vm_dirty_bytes,
2701                 .maxlen         = sizeof(vm_dirty_bytes),
2702                 .mode           = 0644,
2703                 .proc_handler   = dirty_bytes_handler,
2704                 .extra1         = &dirty_bytes_min,
2705         },
2706         {
2707                 .procname       = "dirty_writeback_centisecs",
2708                 .data           = &dirty_writeback_interval,
2709                 .maxlen         = sizeof(dirty_writeback_interval),
2710                 .mode           = 0644,
2711                 .proc_handler   = dirty_writeback_centisecs_handler,
2712         },
2713         {
2714                 .procname       = "dirty_expire_centisecs",
2715                 .data           = &dirty_expire_interval,
2716                 .maxlen         = sizeof(dirty_expire_interval),
2717                 .mode           = 0644,
2718                 .proc_handler   = proc_dointvec_minmax,
2719                 .extra1         = SYSCTL_ZERO,
2720         },
2721         {
2722                 .procname       = "dirtytime_expire_seconds",
2723                 .data           = &dirtytime_expire_interval,
2724                 .maxlen         = sizeof(dirtytime_expire_interval),
2725                 .mode           = 0644,
2726                 .proc_handler   = dirtytime_interval_handler,
2727                 .extra1         = SYSCTL_ZERO,
2728         },
2729         {
2730                 .procname       = "swappiness",
2731                 .data           = &vm_swappiness,
2732                 .maxlen         = sizeof(vm_swappiness),
2733                 .mode           = 0644,
2734                 .proc_handler   = proc_dointvec_minmax,
2735                 .extra1         = SYSCTL_ZERO,
2736                 .extra2         = &two_hundred,
2737         },
2738 #ifdef CONFIG_HUGETLB_PAGE
2739         {
2740                 .procname       = "nr_hugepages",
2741                 .data           = NULL,
2742                 .maxlen         = sizeof(unsigned long),
2743                 .mode           = 0644,
2744                 .proc_handler   = hugetlb_sysctl_handler,
2745         },
2746 #ifdef CONFIG_NUMA
2747         {
2748                 .procname       = "nr_hugepages_mempolicy",
2749                 .data           = NULL,
2750                 .maxlen         = sizeof(unsigned long),
2751                 .mode           = 0644,
2752                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
2753         },
2754         {
2755                 .procname               = "numa_stat",
2756                 .data                   = &sysctl_vm_numa_stat,
2757                 .maxlen                 = sizeof(int),
2758                 .mode                   = 0644,
2759                 .proc_handler   = sysctl_vm_numa_stat_handler,
2760                 .extra1                 = SYSCTL_ZERO,
2761                 .extra2                 = SYSCTL_ONE,
2762         },
2763 #endif
2764          {
2765                 .procname       = "hugetlb_shm_group",
2766                 .data           = &sysctl_hugetlb_shm_group,
2767                 .maxlen         = sizeof(gid_t),
2768                 .mode           = 0644,
2769                 .proc_handler   = proc_dointvec,
2770          },
2771         {
2772                 .procname       = "nr_overcommit_hugepages",
2773                 .data           = NULL,
2774                 .maxlen         = sizeof(unsigned long),
2775                 .mode           = 0644,
2776                 .proc_handler   = hugetlb_overcommit_handler,
2777         },
2778 #endif
2779         {
2780                 .procname       = "lowmem_reserve_ratio",
2781                 .data           = &sysctl_lowmem_reserve_ratio,
2782                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
2783                 .mode           = 0644,
2784                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
2785         },
2786         {
2787                 .procname       = "drop_caches",
2788                 .data           = &sysctl_drop_caches,
2789                 .maxlen         = sizeof(int),
2790                 .mode           = 0200,
2791                 .proc_handler   = drop_caches_sysctl_handler,
2792                 .extra1         = SYSCTL_ONE,
2793                 .extra2         = &four,
2794         },
2795 #ifdef CONFIG_COMPACTION
2796         {
2797                 .procname       = "compact_memory",
2798                 .data           = &sysctl_compact_memory,
2799                 .maxlen         = sizeof(int),
2800                 .mode           = 0200,
2801                 .proc_handler   = sysctl_compaction_handler,
2802         },
2803         {
2804                 .procname       = "extfrag_threshold",
2805                 .data           = &sysctl_extfrag_threshold,
2806                 .maxlen         = sizeof(int),
2807                 .mode           = 0644,
2808                 .proc_handler   = proc_dointvec_minmax,
2809                 .extra1         = &min_extfrag_threshold,
2810                 .extra2         = &max_extfrag_threshold,
2811         },
2812         {
2813                 .procname       = "compact_unevictable_allowed",
2814                 .data           = &sysctl_compact_unevictable_allowed,
2815                 .maxlen         = sizeof(int),
2816                 .mode           = 0644,
2817                 .proc_handler   = proc_dointvec_minmax_warn_RT_change,
2818                 .extra1         = SYSCTL_ZERO,
2819                 .extra2         = SYSCTL_ONE,
2820         },
2821
2822 #endif /* CONFIG_COMPACTION */
2823         {
2824                 .procname       = "min_free_kbytes",
2825                 .data           = &min_free_kbytes,
2826                 .maxlen         = sizeof(min_free_kbytes),
2827                 .mode           = 0644,
2828                 .proc_handler   = min_free_kbytes_sysctl_handler,
2829                 .extra1         = SYSCTL_ZERO,
2830         },
2831         {
2832                 .procname       = "watermark_boost_factor",
2833                 .data           = &watermark_boost_factor,
2834                 .maxlen         = sizeof(watermark_boost_factor),
2835                 .mode           = 0644,
2836                 .proc_handler   = proc_dointvec_minmax,
2837                 .extra1         = SYSCTL_ZERO,
2838         },
2839         {
2840                 .procname       = "watermark_scale_factor",
2841                 .data           = &watermark_scale_factor,
2842                 .maxlen         = sizeof(watermark_scale_factor),
2843                 .mode           = 0644,
2844                 .proc_handler   = watermark_scale_factor_sysctl_handler,
2845                 .extra1         = SYSCTL_ONE,
2846                 .extra2         = &one_thousand,
2847         },
2848         {
2849                 .procname       = "percpu_pagelist_fraction",
2850                 .data           = &percpu_pagelist_fraction,
2851                 .maxlen         = sizeof(percpu_pagelist_fraction),
2852                 .mode           = 0644,
2853                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
2854                 .extra1         = SYSCTL_ZERO,
2855         },
2856 #ifdef CONFIG_MMU
2857         {
2858                 .procname       = "max_map_count",
2859                 .data           = &sysctl_max_map_count,
2860                 .maxlen         = sizeof(sysctl_max_map_count),
2861                 .mode           = 0644,
2862                 .proc_handler   = proc_dointvec_minmax,
2863                 .extra1         = SYSCTL_ZERO,
2864         },
2865 #else
2866         {
2867                 .procname       = "nr_trim_pages",
2868                 .data           = &sysctl_nr_trim_pages,
2869                 .maxlen         = sizeof(sysctl_nr_trim_pages),
2870                 .mode           = 0644,
2871                 .proc_handler   = proc_dointvec_minmax,
2872                 .extra1         = SYSCTL_ZERO,
2873         },
2874 #endif
2875         {
2876                 .procname       = "laptop_mode",
2877                 .data           = &laptop_mode,
2878                 .maxlen         = sizeof(laptop_mode),
2879                 .mode           = 0644,
2880                 .proc_handler   = proc_dointvec_jiffies,
2881         },
2882         {
2883                 .procname       = "block_dump",
2884                 .data           = &block_dump,
2885                 .maxlen         = sizeof(block_dump),
2886                 .mode           = 0644,
2887                 .proc_handler   = proc_dointvec,
2888                 .extra1         = SYSCTL_ZERO,
2889         },
2890         {
2891                 .procname       = "vfs_cache_pressure",
2892                 .data           = &sysctl_vfs_cache_pressure,
2893                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
2894                 .mode           = 0644,
2895                 .proc_handler   = proc_dointvec,
2896                 .extra1         = SYSCTL_ZERO,
2897         },
2898 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2899     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2900         {
2901                 .procname       = "legacy_va_layout",
2902                 .data           = &sysctl_legacy_va_layout,
2903                 .maxlen         = sizeof(sysctl_legacy_va_layout),
2904                 .mode           = 0644,
2905                 .proc_handler   = proc_dointvec,
2906                 .extra1         = SYSCTL_ZERO,
2907         },
2908 #endif
2909 #ifdef CONFIG_NUMA
2910         {
2911                 .procname       = "zone_reclaim_mode",
2912                 .data           = &node_reclaim_mode,
2913                 .maxlen         = sizeof(node_reclaim_mode),
2914                 .mode           = 0644,
2915                 .proc_handler   = proc_dointvec,
2916                 .extra1         = SYSCTL_ZERO,
2917         },
2918         {
2919                 .procname       = "min_unmapped_ratio",
2920                 .data           = &sysctl_min_unmapped_ratio,
2921                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
2922                 .mode           = 0644,
2923                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
2924                 .extra1         = SYSCTL_ZERO,
2925                 .extra2         = &one_hundred,
2926         },
2927         {
2928                 .procname       = "min_slab_ratio",
2929                 .data           = &sysctl_min_slab_ratio,
2930                 .maxlen         = sizeof(sysctl_min_slab_ratio),
2931                 .mode           = 0644,
2932                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
2933                 .extra1         = SYSCTL_ZERO,
2934                 .extra2         = &one_hundred,
2935         },
2936 #endif
2937 #ifdef CONFIG_SMP
2938         {
2939                 .procname       = "stat_interval",
2940                 .data           = &sysctl_stat_interval,
2941                 .maxlen         = sizeof(sysctl_stat_interval),
2942                 .mode           = 0644,
2943                 .proc_handler   = proc_dointvec_jiffies,
2944         },
2945         {
2946                 .procname       = "stat_refresh",
2947                 .data           = NULL,
2948                 .maxlen         = 0,
2949                 .mode           = 0600,
2950                 .proc_handler   = vmstat_refresh,
2951         },
2952 #endif
2953 #ifdef CONFIG_MMU
2954         {
2955                 .procname       = "mmap_min_addr",
2956                 .data           = &dac_mmap_min_addr,
2957                 .maxlen         = sizeof(unsigned long),
2958                 .mode           = 0644,
2959                 .proc_handler   = mmap_min_addr_handler,
2960         },
2961 #endif
2962 #ifdef CONFIG_NUMA
2963         {
2964                 .procname       = "numa_zonelist_order",
2965                 .data           = &numa_zonelist_order,
2966                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
2967                 .mode           = 0644,
2968                 .proc_handler   = numa_zonelist_order_handler,
2969         },
2970 #endif
2971 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
2972    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
2973         {
2974                 .procname       = "vdso_enabled",
2975 #ifdef CONFIG_X86_32
2976                 .data           = &vdso32_enabled,
2977                 .maxlen         = sizeof(vdso32_enabled),
2978 #else
2979                 .data           = &vdso_enabled,
2980                 .maxlen         = sizeof(vdso_enabled),
2981 #endif
2982                 .mode           = 0644,
2983                 .proc_handler   = proc_dointvec,
2984                 .extra1         = SYSCTL_ZERO,
2985         },
2986 #endif
2987 #ifdef CONFIG_HIGHMEM
2988         {
2989                 .procname       = "highmem_is_dirtyable",
2990                 .data           = &vm_highmem_is_dirtyable,
2991                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
2992                 .mode           = 0644,
2993                 .proc_handler   = proc_dointvec_minmax,
2994                 .extra1         = SYSCTL_ZERO,
2995                 .extra2         = SYSCTL_ONE,
2996         },
2997 #endif
2998 #ifdef CONFIG_MEMORY_FAILURE
2999         {
3000                 .procname       = "memory_failure_early_kill",
3001                 .data           = &sysctl_memory_failure_early_kill,
3002                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
3003                 .mode           = 0644,
3004                 .proc_handler   = proc_dointvec_minmax,
3005                 .extra1         = SYSCTL_ZERO,
3006                 .extra2         = SYSCTL_ONE,
3007         },
3008         {
3009                 .procname       = "memory_failure_recovery",
3010                 .data           = &sysctl_memory_failure_recovery,
3011                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
3012                 .mode           = 0644,
3013                 .proc_handler   = proc_dointvec_minmax,
3014                 .extra1         = SYSCTL_ZERO,
3015                 .extra2         = SYSCTL_ONE,
3016         },
3017 #endif
3018         {
3019                 .procname       = "user_reserve_kbytes",
3020                 .data           = &sysctl_user_reserve_kbytes,
3021                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
3022                 .mode           = 0644,
3023                 .proc_handler   = proc_doulongvec_minmax,
3024         },
3025         {
3026                 .procname       = "admin_reserve_kbytes",
3027                 .data           = &sysctl_admin_reserve_kbytes,
3028                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
3029                 .mode           = 0644,
3030                 .proc_handler   = proc_doulongvec_minmax,
3031         },
3032 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3033         {
3034                 .procname       = "mmap_rnd_bits",
3035                 .data           = &mmap_rnd_bits,
3036                 .maxlen         = sizeof(mmap_rnd_bits),
3037                 .mode           = 0600,
3038                 .proc_handler   = proc_dointvec_minmax,
3039                 .extra1         = (void *)&mmap_rnd_bits_min,
3040                 .extra2         = (void *)&mmap_rnd_bits_max,
3041         },
3042 #endif
3043 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3044         {
3045                 .procname       = "mmap_rnd_compat_bits",
3046                 .data           = &mmap_rnd_compat_bits,
3047                 .maxlen         = sizeof(mmap_rnd_compat_bits),
3048                 .mode           = 0600,
3049                 .proc_handler   = proc_dointvec_minmax,
3050                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
3051                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
3052         },
3053 #endif
3054 #ifdef CONFIG_USERFAULTFD
3055         {
3056                 .procname       = "unprivileged_userfaultfd",
3057                 .data           = &sysctl_unprivileged_userfaultfd,
3058                 .maxlen         = sizeof(sysctl_unprivileged_userfaultfd),
3059                 .mode           = 0644,
3060                 .proc_handler   = proc_dointvec_minmax,
3061                 .extra1         = SYSCTL_ZERO,
3062                 .extra2         = SYSCTL_ONE,
3063         },
3064 #endif
3065         { }
3066 };
3067
3068 static struct ctl_table fs_table[] = {
3069         {
3070                 .procname       = "inode-nr",
3071                 .data           = &inodes_stat,
3072                 .maxlen         = 2*sizeof(long),
3073                 .mode           = 0444,
3074                 .proc_handler   = proc_nr_inodes,
3075         },
3076         {
3077                 .procname       = "inode-state",
3078                 .data           = &inodes_stat,
3079                 .maxlen         = 7*sizeof(long),
3080                 .mode           = 0444,
3081                 .proc_handler   = proc_nr_inodes,
3082         },
3083         {
3084                 .procname       = "file-nr",
3085                 .data           = &files_stat,
3086                 .maxlen         = sizeof(files_stat),
3087                 .mode           = 0444,
3088                 .proc_handler   = proc_nr_files,
3089         },
3090         {
3091                 .procname       = "file-max",
3092                 .data           = &files_stat.max_files,
3093                 .maxlen         = sizeof(files_stat.max_files),
3094                 .mode           = 0644,
3095                 .proc_handler   = proc_doulongvec_minmax,
3096                 .extra1         = &zero_ul,
3097                 .extra2         = &long_max,
3098         },
3099         {
3100                 .procname       = "nr_open",
3101                 .data           = &sysctl_nr_open,
3102                 .maxlen         = sizeof(unsigned int),
3103                 .mode           = 0644,
3104                 .proc_handler   = proc_dointvec_minmax,
3105                 .extra1         = &sysctl_nr_open_min,
3106                 .extra2         = &sysctl_nr_open_max,
3107         },
3108         {
3109                 .procname       = "dentry-state",
3110                 .data           = &dentry_stat,
3111                 .maxlen         = 6*sizeof(long),
3112                 .mode           = 0444,
3113                 .proc_handler   = proc_nr_dentry,
3114         },
3115         {
3116                 .procname       = "overflowuid",
3117                 .data           = &fs_overflowuid,
3118                 .maxlen         = sizeof(int),
3119                 .mode           = 0644,
3120                 .proc_handler   = proc_dointvec_minmax,
3121                 .extra1         = &minolduid,
3122                 .extra2         = &maxolduid,
3123         },
3124         {
3125                 .procname       = "overflowgid",
3126                 .data           = &fs_overflowgid,
3127                 .maxlen         = sizeof(int),
3128                 .mode           = 0644,
3129                 .proc_handler   = proc_dointvec_minmax,
3130                 .extra1         = &minolduid,
3131                 .extra2         = &maxolduid,
3132         },
3133 #ifdef CONFIG_FILE_LOCKING
3134         {
3135                 .procname       = "leases-enable",
3136                 .data           = &leases_enable,
3137                 .maxlen         = sizeof(int),
3138                 .mode           = 0644,
3139                 .proc_handler   = proc_dointvec,
3140         },
3141 #endif
3142 #ifdef CONFIG_DNOTIFY
3143         {
3144                 .procname       = "dir-notify-enable",
3145                 .data           = &dir_notify_enable,
3146                 .maxlen         = sizeof(int),
3147                 .mode           = 0644,
3148                 .proc_handler   = proc_dointvec,
3149         },
3150 #endif
3151 #ifdef CONFIG_MMU
3152 #ifdef CONFIG_FILE_LOCKING
3153         {
3154                 .procname       = "lease-break-time",
3155                 .data           = &lease_break_time,
3156                 .maxlen         = sizeof(int),
3157                 .mode           = 0644,
3158                 .proc_handler   = proc_dointvec,
3159         },
3160 #endif
3161 #ifdef CONFIG_AIO
3162         {
3163                 .procname       = "aio-nr",
3164                 .data           = &aio_nr,
3165                 .maxlen         = sizeof(aio_nr),
3166                 .mode           = 0444,
3167                 .proc_handler   = proc_doulongvec_minmax,
3168         },
3169         {
3170                 .procname       = "aio-max-nr",
3171                 .data           = &aio_max_nr,
3172                 .maxlen         = sizeof(aio_max_nr),
3173                 .mode           = 0644,
3174                 .proc_handler   = proc_doulongvec_minmax,
3175         },
3176 #endif /* CONFIG_AIO */
3177 #ifdef CONFIG_INOTIFY_USER
3178         {
3179                 .procname       = "inotify",
3180                 .mode           = 0555,
3181                 .child          = inotify_table,
3182         },
3183 #endif
3184 #ifdef CONFIG_EPOLL
3185         {
3186                 .procname       = "epoll",
3187                 .mode           = 0555,
3188                 .child          = epoll_table,
3189         },
3190 #endif
3191 #endif
3192         {
3193                 .procname       = "protected_symlinks",
3194                 .data           = &sysctl_protected_symlinks,
3195                 .maxlen         = sizeof(int),
3196                 .mode           = 0600,
3197                 .proc_handler   = proc_dointvec_minmax,
3198                 .extra1         = SYSCTL_ZERO,
3199                 .extra2         = SYSCTL_ONE,
3200         },
3201         {
3202                 .procname       = "protected_hardlinks",
3203                 .data           = &sysctl_protected_hardlinks,
3204                 .maxlen         = sizeof(int),
3205                 .mode           = 0600,
3206                 .proc_handler   = proc_dointvec_minmax,
3207                 .extra1         = SYSCTL_ZERO,
3208                 .extra2         = SYSCTL_ONE,
3209         },
3210         {
3211                 .procname       = "protected_fifos",
3212                 .data           = &sysctl_protected_fifos,
3213                 .maxlen         = sizeof(int),
3214                 .mode           = 0600,
3215                 .proc_handler   = proc_dointvec_minmax,
3216                 .extra1         = SYSCTL_ZERO,
3217                 .extra2         = &two,
3218         },
3219         {
3220                 .procname       = "protected_regular",
3221                 .data           = &sysctl_protected_regular,
3222                 .maxlen         = sizeof(int),
3223                 .mode           = 0600,
3224                 .proc_handler   = proc_dointvec_minmax,
3225                 .extra1         = SYSCTL_ZERO,
3226                 .extra2         = &two,
3227         },
3228         {
3229                 .procname       = "suid_dumpable",
3230                 .data           = &suid_dumpable,
3231                 .maxlen         = sizeof(int),
3232                 .mode           = 0644,
3233                 .proc_handler   = proc_dointvec_minmax_coredump,
3234                 .extra1         = SYSCTL_ZERO,
3235                 .extra2         = &two,
3236         },
3237 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3238         {
3239                 .procname       = "binfmt_misc",
3240                 .mode           = 0555,
3241                 .child          = sysctl_mount_point,
3242         },
3243 #endif
3244         {
3245                 .procname       = "pipe-max-size",
3246                 .data           = &pipe_max_size,
3247                 .maxlen         = sizeof(pipe_max_size),
3248                 .mode           = 0644,
3249                 .proc_handler   = proc_dopipe_max_size,
3250         },
3251         {
3252                 .procname       = "pipe-user-pages-hard",
3253                 .data           = &pipe_user_pages_hard,
3254                 .maxlen         = sizeof(pipe_user_pages_hard),
3255                 .mode           = 0644,
3256                 .proc_handler   = proc_doulongvec_minmax,
3257         },
3258         {
3259                 .procname       = "pipe-user-pages-soft",
3260                 .data           = &pipe_user_pages_soft,
3261                 .maxlen         = sizeof(pipe_user_pages_soft),
3262                 .mode           = 0644,
3263                 .proc_handler   = proc_doulongvec_minmax,
3264         },
3265         {
3266                 .procname       = "mount-max",
3267                 .data           = &sysctl_mount_max,
3268                 .maxlen         = sizeof(unsigned int),
3269                 .mode           = 0644,
3270                 .proc_handler   = proc_dointvec_minmax,
3271                 .extra1         = SYSCTL_ONE,
3272         },
3273         { }
3274 };
3275
3276 static struct ctl_table debug_table[] = {
3277 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3278         {
3279                 .procname       = "exception-trace",
3280                 .data           = &show_unhandled_signals,
3281                 .maxlen         = sizeof(int),
3282                 .mode           = 0644,
3283                 .proc_handler   = proc_dointvec
3284         },
3285 #endif
3286 #if defined(CONFIG_OPTPROBES)
3287         {
3288                 .procname       = "kprobes-optimization",
3289                 .data           = &sysctl_kprobes_optimization,
3290                 .maxlen         = sizeof(int),
3291                 .mode           = 0644,
3292                 .proc_handler   = proc_kprobes_optimization_handler,
3293                 .extra1         = SYSCTL_ZERO,
3294                 .extra2         = SYSCTL_ONE,
3295         },
3296 #endif
3297         { }
3298 };
3299
3300 static struct ctl_table dev_table[] = {
3301         { }
3302 };
3303
3304 static struct ctl_table sysctl_base_table[] = {
3305         {
3306                 .procname       = "kernel",
3307                 .mode           = 0555,
3308                 .child          = kern_table,
3309         },
3310         {
3311                 .procname       = "vm",
3312                 .mode           = 0555,
3313                 .child          = vm_table,
3314         },
3315         {
3316                 .procname       = "fs",
3317                 .mode           = 0555,
3318                 .child          = fs_table,
3319         },
3320         {
3321                 .procname       = "debug",
3322                 .mode           = 0555,
3323                 .child          = debug_table,
3324         },
3325         {
3326                 .procname       = "dev",
3327                 .mode           = 0555,
3328                 .child          = dev_table,
3329         },
3330         { }
3331 };
3332
3333 int __init sysctl_init(void)
3334 {
3335         struct ctl_table_header *hdr;
3336
3337         hdr = register_sysctl_table(sysctl_base_table);
3338         kmemleak_not_leak(hdr);
3339         return 0;
3340 }
3341 #endif /* CONFIG_SYSCTL */
3342 /*
3343  * No sense putting this after each symbol definition, twice,
3344  * exception granted :-)
3345  */
3346 EXPORT_SYMBOL(proc_dointvec);
3347 EXPORT_SYMBOL(proc_douintvec);
3348 EXPORT_SYMBOL(proc_dointvec_jiffies);
3349 EXPORT_SYMBOL(proc_dointvec_minmax);
3350 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3351 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3352 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3353 EXPORT_SYMBOL(proc_dostring);
3354 EXPORT_SYMBOL(proc_doulongvec_minmax);
3355 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3356 EXPORT_SYMBOL(proc_do_large_bitmap);