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                 int i;
 870
 871                 /*
 872                  * If we are relying on panic_on_taint not producing
 873                  * false positives due to userspace input, bail out
 874                  * before setting the requested taint flags.
 875                  */
 876                 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
 877                         return -EINVAL;
 878
 879                 /*
 880                  * Poor man's atomic or. Not worth adding a primitive
 881                  * to everyone's atomic.h for this
 882                  */
 883                 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
 884                         if ((1UL << i) & tmptaint)
 885                                 add_taint(i, LOCKDEP_STILL_OK);
 886         }
 887
 888         return err;
 889 }
 890
 891 #ifdef CONFIG_PRINTK
 892 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 893                                 void *buffer, size_t *lenp, loff_t *ppos)
 894 {
 895         if (write && !capable(CAP_SYS_ADMIN))
 896                 return -EPERM;
 897
 898         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 899 }
 900 #endif
 901
 902 /**
 903  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
 904  * @min: pointer to minimum allowable value
 905  * @max: pointer to maximum allowable value
 906  *
 907  * The do_proc_dointvec_minmax_conv_param structure provides the
 908  * minimum and maximum values for doing range checking for those sysctl
 909  * parameters that use the proc_dointvec_minmax() handler.
 910  */
 911 struct do_proc_dointvec_minmax_conv_param {
 912         int *min;
 913         int *max;
 914 };
 915
 916 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
 917                                         int *valp,
 918                                         int write, void *data)
 919 {
 920         int tmp, ret;
 921         struct do_proc_dointvec_minmax_conv_param *param = data;
 922         /*
 923          * If writing, first do so via a temporary local int so we can
 924          * bounds-check it before touching *valp.
 925          */
 926         int *ip = write ? &tmp : valp;
 927
 928         ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
 929         if (ret)
 930                 return ret;
 931
 932         if (write) {
 933                 if ((param->min && *param->min > tmp) ||
 934                     (param->max && *param->max < tmp))
 935                         return -EINVAL;
 936                 *valp = tmp;
 937         }
 938
 939         return 0;
 940 }
 941
 942 /**
 943  * proc_dointvec_minmax - read a vector of integers with min/max values
 944  * @table: the sysctl table
 945  * @write: %TRUE if this is a write to the sysctl file
 946  * @buffer: the user buffer
 947  * @lenp: the size of the user buffer
 948  * @ppos: file position
 949  *
 950  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 951  * values from/to the user buffer, treated as an ASCII string.
 952  *
 953  * This routine will ensure the values are within the range specified by
 954  * table->extra1 (min) and table->extra2 (max).
 955  *
 956  * Returns 0 on success or -EINVAL on write when the range check fails.
 957  */
 958 int proc_dointvec_minmax(struct ctl_table *table, int write,
 959                   void *buffer, size_t *lenp, loff_t *ppos)
 960 {
 961         struct do_proc_dointvec_minmax_conv_param param = {
 962                 .min = (int *) table->extra1,
 963                 .max = (int *) table->extra2,
 964         };
 965         return do_proc_dointvec(table, write, buffer, lenp, ppos,
 966                                 do_proc_dointvec_minmax_conv, &param);
 967 }
 968
 969 /**
 970  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
 971  * @min: pointer to minimum allowable value
 972  * @max: pointer to maximum allowable value
 973  *
 974  * The do_proc_douintvec_minmax_conv_param structure provides the
 975  * minimum and maximum values for doing range checking for those sysctl
 976  * parameters that use the proc_douintvec_minmax() handler.
 977  */
 978 struct do_proc_douintvec_minmax_conv_param {
 979         unsigned int *min;
 980         unsigned int *max;
 981 };
 982
 983 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
 984                                          unsigned int *valp,
 985                                          int write, void *data)
 986 {
 987         int ret;
 988         unsigned int tmp;
 989         struct do_proc_douintvec_minmax_conv_param *param = data;
 990         /* write via temporary local uint for bounds-checking */
 991         unsigned int *up = write ? &tmp : valp;
 992
 993         ret = do_proc_douintvec_conv(lvalp, up, write, data);
 994         if (ret)
 995                 return ret;
 996
 997         if (write) {
 998                 if ((param->min && *param->min > tmp) ||
 999                     (param->max && *param->max < tmp))
1000                         return -ERANGE;
1001
1002                 *valp = tmp;
1003         }
1004
1005         return 0;
1006 }
1007
1008 /**
1009  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1010  * @table: the sysctl table
1011  * @write: %TRUE if this is a write to the sysctl file
1012  * @buffer: the user buffer
1013  * @lenp: the size of the user buffer
1014  * @ppos: file position
1015  *
1016  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1017  * values from/to the user buffer, treated as an ASCII string. Negative
1018  * strings are not allowed.
1019  *
1020  * This routine will ensure the values are within the range specified by
1021  * table->extra1 (min) and table->extra2 (max). There is a final sanity
1022  * check for UINT_MAX to avoid having to support wrap around uses from
1023  * userspace.
1024  *
1025  * Returns 0 on success or -ERANGE on write when the range check fails.
1026  */
1027 int proc_douintvec_minmax(struct ctl_table *table, int write,
1028                           void *buffer, size_t *lenp, loff_t *ppos)
1029 {
1030         struct do_proc_douintvec_minmax_conv_param param = {
1031                 .min = (unsigned int *) table->extra1,
1032                 .max = (unsigned int *) table->extra2,
1033         };
1034         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1035                                  do_proc_douintvec_minmax_conv, &param);
1036 }
1037
1038 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1039                                         unsigned int *valp,
1040                                         int write, void *data)
1041 {
1042         if (write) {
1043                 unsigned int val;
1044
1045                 val = round_pipe_size(*lvalp);
1046                 if (val == 0)
1047                         return -EINVAL;
1048
1049                 *valp = val;
1050         } else {
1051                 unsigned int val = *valp;
1052                 *lvalp = (unsigned long) val;
1053         }
1054
1055         return 0;
1056 }
1057
1058 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1059                                 void *buffer, size_t *lenp, loff_t *ppos)
1060 {
1061         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1062                                  do_proc_dopipe_max_size_conv, NULL);
1063 }
1064
1065 static void validate_coredump_safety(void)
1066 {
1067 #ifdef CONFIG_COREDUMP
1068         if (suid_dumpable == SUID_DUMP_ROOT &&
1069             core_pattern[0] != '/' && core_pattern[0] != '|') {
1070                 printk(KERN_WARNING
1071 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1072 "Pipe handler or fully qualified core dump path required.\n"
1073 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1074                 );
1075         }
1076 #endif
1077 }
1078
1079 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1080                 void *buffer, size_t *lenp, loff_t *ppos)
1081 {
1082         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1083         if (!error)
1084                 validate_coredump_safety();
1085         return error;
1086 }
1087
1088 #ifdef CONFIG_COREDUMP
1089 static int proc_dostring_coredump(struct ctl_table *table, int write,
1090                   void *buffer, size_t *lenp, loff_t *ppos)
1091 {
1092         int error = proc_dostring(table, write, buffer, lenp, ppos);
1093         if (!error)
1094                 validate_coredump_safety();
1095         return error;
1096 }
1097 #endif
1098
1099 #ifdef CONFIG_MAGIC_SYSRQ
1100 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1101                                 void *buffer, size_t *lenp, loff_t *ppos)
1102 {
1103         int tmp, ret;
1104
1105         tmp = sysrq_mask();
1106
1107         ret = __do_proc_dointvec(&tmp, table, write, buffer,
1108                                lenp, ppos, NULL, NULL);
1109         if (ret || !write)
1110                 return ret;
1111
1112         if (write)
1113                 sysrq_toggle_support(tmp);
1114
1115         return 0;
1116 }
1117 #endif
1118
1119 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1120                 int write, void *buffer, size_t *lenp, loff_t *ppos,
1121                 unsigned long convmul, unsigned long convdiv)
1122 {
1123         unsigned long *i, *min, *max;
1124         int vleft, first = 1, err = 0;
1125         size_t left;
1126         char *p;
1127
1128         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1129                 *lenp = 0;
1130                 return 0;
1131         }
1132
1133         i = (unsigned long *) data;
1134         min = (unsigned long *) table->extra1;
1135         max = (unsigned long *) table->extra2;
1136         vleft = table->maxlen / sizeof(unsigned long);
1137         left = *lenp;
1138
1139         if (write) {
1140                 if (proc_first_pos_non_zero_ignore(ppos, table))
1141                         goto out;
1142
1143                 if (left > PAGE_SIZE - 1)
1144                         left = PAGE_SIZE - 1;
1145                 p = buffer;
1146         }
1147
1148         for (; left && vleft--; i++, first = 0) {
1149                 unsigned long val;
1150
1151                 if (write) {
1152                         bool neg;
1153
1154                         left -= proc_skip_spaces(&p);
1155                         if (!left)
1156                                 break;
1157
1158                         err = proc_get_long(&p, &left, &val, &neg,
1159                                              proc_wspace_sep,
1160                                              sizeof(proc_wspace_sep), NULL);
1161                         if (err)
1162                                 break;
1163                         if (neg)
1164                                 continue;
1165                         val = convmul * val / convdiv;
1166                         if ((min && val < *min) || (max && val > *max)) {
1167                                 err = -EINVAL;
1168                                 break;
1169                         }
1170                         *i = val;
1171                 } else {
1172                         val = convdiv * (*i) / convmul;
1173                         if (!first)
1174                                 proc_put_char(&buffer, &left, '\t');
1175                         proc_put_long(&buffer, &left, val, false);
1176                 }
1177         }
1178
1179         if (!write && !first && left && !err)
1180                 proc_put_char(&buffer, &left, '\n');
1181         if (write && !err)
1182                 left -= proc_skip_spaces(&p);
1183         if (write && first)
1184                 return err ? : -EINVAL;
1185         *lenp -= left;
1186 out:
1187         *ppos += *lenp;
1188         return err;
1189 }
1190
1191 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1192                 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1193                 unsigned long convdiv)
1194 {
1195         return __do_proc_doulongvec_minmax(table->data, table, write,
1196                         buffer, lenp, ppos, convmul, convdiv);
1197 }
1198
1199 /**
1200  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1201  * @table: the sysctl table
1202  * @write: %TRUE if this is a write to the sysctl file
1203  * @buffer: the user buffer
1204  * @lenp: the size of the user buffer
1205  * @ppos: file position
1206  *
1207  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1208  * values from/to the user buffer, treated as an ASCII string.
1209  *
1210  * This routine will ensure the values are within the range specified by
1211  * table->extra1 (min) and table->extra2 (max).
1212  *
1213  * Returns 0 on success.
1214  */
1215 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1216                            void *buffer, size_t *lenp, loff_t *ppos)
1217 {
1218     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1219 }
1220
1221 /**
1222  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1223  * @table: the sysctl table
1224  * @write: %TRUE if this is a write to the sysctl file
1225  * @buffer: the user buffer
1226  * @lenp: the size of the user buffer
1227  * @ppos: file position
1228  *
1229  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1230  * values from/to the user buffer, treated as an ASCII string. The values
1231  * are treated as milliseconds, and converted to jiffies when they are stored.
1232  *
1233  * This routine will ensure the values are within the range specified by
1234  * table->extra1 (min) and table->extra2 (max).
1235  *
1236  * Returns 0 on success.
1237  */
1238 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1239                                       void *buffer, size_t *lenp, loff_t *ppos)
1240 {
1241     return do_proc_doulongvec_minmax(table, write, buffer,
1242                                      lenp, ppos, HZ, 1000l);
1243 }
1244
1245
1246 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1247                                          int *valp,
1248                                          int write, void *data)
1249 {
1250         if (write) {
1251                 if (*lvalp > INT_MAX / HZ)
1252                         return 1;
1253                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1254         } else {
1255                 int val = *valp;
1256                 unsigned long lval;
1257                 if (val < 0) {
1258                         *negp = true;
1259                         lval = -(unsigned long)val;
1260                 } else {
1261                         *negp = false;
1262                         lval = (unsigned long)val;
1263                 }
1264                 *lvalp = lval / HZ;
1265         }
1266         return 0;
1267 }
1268
1269 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1270                                                 int *valp,
1271                                                 int write, void *data)
1272 {
1273         if (write) {
1274                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1275                         return 1;
1276                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1277         } else {
1278                 int val = *valp;
1279                 unsigned long lval;
1280                 if (val < 0) {
1281                         *negp = true;
1282                         lval = -(unsigned long)val;
1283                 } else {
1284                         *negp = false;
1285                         lval = (unsigned long)val;
1286                 }
1287                 *lvalp = jiffies_to_clock_t(lval);
1288         }
1289         return 0;
1290 }
1291
1292 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1293                                             int *valp,
1294                                             int write, void *data)
1295 {
1296         if (write) {
1297                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1298
1299                 if (jif > INT_MAX)
1300                         return 1;
1301                 *valp = (int)jif;
1302         } else {
1303                 int val = *valp;
1304                 unsigned long lval;
1305                 if (val < 0) {
1306                         *negp = true;
1307                         lval = -(unsigned long)val;
1308                 } else {
1309                         *negp = false;
1310                         lval = (unsigned long)val;
1311                 }
1312                 *lvalp = jiffies_to_msecs(lval);
1313         }
1314         return 0;
1315 }
1316
1317 /**
1318  * proc_dointvec_jiffies - read a vector of integers as seconds
1319  * @table: the sysctl table
1320  * @write: %TRUE if this is a write to the sysctl file
1321  * @buffer: the user buffer
1322  * @lenp: the size of the user buffer
1323  * @ppos: file position
1324  *
1325  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1326  * values from/to the user buffer, treated as an ASCII string.
1327  * The values read are assumed to be in seconds, and are converted into
1328  * jiffies.
1329  *
1330  * Returns 0 on success.
1331  */
1332 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1333                           void *buffer, size_t *lenp, loff_t *ppos)
1334 {
1335     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1336                             do_proc_dointvec_jiffies_conv,NULL);
1337 }
1338
1339 /**
1340  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1341  * @table: the sysctl table
1342  * @write: %TRUE if this is a write to the sysctl file
1343  * @buffer: the user buffer
1344  * @lenp: the size of the user buffer
1345  * @ppos: pointer to the file position
1346  *
1347  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1348  * values from/to the user buffer, treated as an ASCII string.
1349  * The values read are assumed to be in 1/USER_HZ seconds, and
1350  * are converted into jiffies.
1351  *
1352  * Returns 0 on success.
1353  */
1354 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1355                                  void *buffer, size_t *lenp, loff_t *ppos)
1356 {
1357     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1358                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1359 }
1360
1361 /**
1362  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1363  * @table: the sysctl table
1364  * @write: %TRUE if this is a write to the sysctl file
1365  * @buffer: the user buffer
1366  * @lenp: the size of the user buffer
1367  * @ppos: file position
1368  * @ppos: the current position in the file
1369  *
1370  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1371  * values from/to the user buffer, treated as an ASCII string.
1372  * The values read are assumed to be in 1/1000 seconds, and
1373  * are converted into jiffies.
1374  *
1375  * Returns 0 on success.
1376  */
1377 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1378                 size_t *lenp, loff_t *ppos)
1379 {
1380         return do_proc_dointvec(table, write, buffer, lenp, ppos,
1381                                 do_proc_dointvec_ms_jiffies_conv, NULL);
1382 }
1383
1384 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1385                 size_t *lenp, loff_t *ppos)
1386 {
1387         struct pid *new_pid;
1388         pid_t tmp;
1389         int r;
1390
1391         tmp = pid_vnr(cad_pid);
1392
1393         r = __do_proc_dointvec(&tmp, table, write, buffer,
1394                                lenp, ppos, NULL, NULL);
1395         if (r || !write)
1396                 return r;
1397
1398         new_pid = find_get_pid(tmp);
1399         if (!new_pid)
1400                 return -ESRCH;
1401
1402         put_pid(xchg(&cad_pid, new_pid));
1403         return 0;
1404 }
1405
1406 /**
1407  * proc_do_large_bitmap - read/write from/to a large bitmap
1408  * @table: the sysctl table
1409  * @write: %TRUE if this is a write to the sysctl file
1410  * @buffer: the user buffer
1411  * @lenp: the size of the user buffer
1412  * @ppos: file position
1413  *
1414  * The bitmap is stored at table->data and the bitmap length (in bits)
1415  * in table->maxlen.
1416  *
1417  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1418  * large bitmaps may be represented in a compact manner. Writing into
1419  * the file will clear the bitmap then update it with the given input.
1420  *
1421  * Returns 0 on success.
1422  */
1423 int proc_do_large_bitmap(struct ctl_table *table, int write,
1424                          void *buffer, size_t *lenp, loff_t *ppos)
1425 {
1426         int err = 0;
1427         bool first = 1;
1428         size_t left = *lenp;
1429         unsigned long bitmap_len = table->maxlen;
1430         unsigned long *bitmap = *(unsigned long **) table->data;
1431         unsigned long *tmp_bitmap = NULL;
1432         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1433
1434         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1435                 *lenp = 0;
1436                 return 0;
1437         }
1438
1439         if (write) {
1440                 char *p = buffer;
1441                 size_t skipped = 0;
1442
1443                 if (left > PAGE_SIZE - 1) {
1444                         left = PAGE_SIZE - 1;
1445                         /* How much of the buffer we'll skip this pass */
1446                         skipped = *lenp - left;
1447                 }
1448
1449                 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1450                 if (!tmp_bitmap)
1451                         return -ENOMEM;
1452                 proc_skip_char(&p, &left, '\n');
1453                 while (!err && left) {
1454                         unsigned long val_a, val_b;
1455                         bool neg;
1456                         size_t saved_left;
1457
1458                         /* In case we stop parsing mid-number, we can reset */
1459                         saved_left = left;
1460                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1461                                              sizeof(tr_a), &c);
1462                         /*
1463                          * If we consumed the entirety of a truncated buffer or
1464                          * only one char is left (may be a "-"), then stop here,
1465                          * reset, & come back for more.
1466                          */
1467                         if ((left <= 1) && skipped) {
1468                                 left = saved_left;
1469                                 break;
1470                         }
1471
1472                         if (err)
1473                                 break;
1474                         if (val_a >= bitmap_len || neg) {
1475                                 err = -EINVAL;
1476                                 break;
1477                         }
1478
1479                         val_b = val_a;
1480                         if (left) {
1481                                 p++;
1482                                 left--;
1483                         }
1484
1485                         if (c == '-') {
1486                                 err = proc_get_long(&p, &left, &val_b,
1487                                                      &neg, tr_b, sizeof(tr_b),
1488                                                      &c);
1489                                 /*
1490                                  * If we consumed all of a truncated buffer or
1491                                  * then stop here, reset, & come back for more.
1492                                  */
1493                                 if (!left && skipped) {
1494                                         left = saved_left;
1495                                         break;
1496                                 }
1497
1498                                 if (err)
1499                                         break;
1500                                 if (val_b >= bitmap_len || neg ||
1501                                     val_a > val_b) {
1502                                         err = -EINVAL;
1503                                         break;
1504                                 }
1505                                 if (left) {
1506                                         p++;
1507                                         left--;
1508                                 }
1509                         }
1510
1511                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1512                         first = 0;
1513                         proc_skip_char(&p, &left, '\n');
1514                 }
1515                 left += skipped;
1516         } else {
1517                 unsigned long bit_a, bit_b = 0;
1518
1519                 while (left) {
1520                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1521                         if (bit_a >= bitmap_len)
1522                                 break;
1523                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
1524                                                    bit_a + 1) - 1;
1525
1526                         if (!first)
1527                                 proc_put_char(&buffer, &left, ',');
1528                         proc_put_long(&buffer, &left, bit_a, false);
1529                         if (bit_a != bit_b) {
1530                                 proc_put_char(&buffer, &left, '-');
1531                                 proc_put_long(&buffer, &left, bit_b, false);
1532                         }
1533
1534                         first = 0; bit_b++;
1535                 }
1536                 proc_put_char(&buffer, &left, '\n');
1537         }
1538
1539         if (!err) {
1540                 if (write) {
1541                         if (*ppos)
1542                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1543                         else
1544                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1545                 }
1546                 *lenp -= left;
1547                 *ppos += *lenp;
1548         }
1549
1550         bitmap_free(tmp_bitmap);
1551         return err;
1552 }
1553
1554 #else /* CONFIG_PROC_SYSCTL */
1555
1556 int proc_dostring(struct ctl_table *table, int write,
1557                   void *buffer, size_t *lenp, loff_t *ppos)
1558 {
1559         return -ENOSYS;
1560 }
1561
1562 int proc_dointvec(struct ctl_table *table, int write,
1563                   void *buffer, size_t *lenp, loff_t *ppos)
1564 {
1565         return -ENOSYS;
1566 }
1567
1568 int proc_douintvec(struct ctl_table *table, int write,
1569                   void *buffer, size_t *lenp, loff_t *ppos)
1570 {
1571         return -ENOSYS;
1572 }
1573
1574 int proc_dointvec_minmax(struct ctl_table *table, int write,
1575                     void *buffer, size_t *lenp, loff_t *ppos)
1576 {
1577         return -ENOSYS;
1578 }
1579
1580 int proc_douintvec_minmax(struct ctl_table *table, int write,
1581                           void *buffer, size_t *lenp, loff_t *ppos)
1582 {
1583         return -ENOSYS;
1584 }
1585
1586 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1587                     void *buffer, size_t *lenp, loff_t *ppos)
1588 {
1589         return -ENOSYS;
1590 }
1591
1592 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1593                     void *buffer, size_t *lenp, loff_t *ppos)
1594 {
1595         return -ENOSYS;
1596 }
1597
1598 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1599                              void *buffer, size_t *lenp, loff_t *ppos)
1600 {
1601         return -ENOSYS;
1602 }
1603
1604 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1605                     void *buffer, size_t *lenp, loff_t *ppos)
1606 {
1607         return -ENOSYS;
1608 }
1609
1610 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1611                                       void *buffer, size_t *lenp, loff_t *ppos)
1612 {
1613         return -ENOSYS;
1614 }
1615
1616 int proc_do_large_bitmap(struct ctl_table *table, int write,
1617                          void *buffer, size_t *lenp, loff_t *ppos)
1618 {
1619         return -ENOSYS;
1620 }
1621
1622 #endif /* CONFIG_PROC_SYSCTL */
1623
1624 #if defined(CONFIG_SYSCTL)
1625 int proc_do_static_key(struct ctl_table *table, int write,
1626                        void *buffer, size_t *lenp, loff_t *ppos)
1627 {
1628         struct static_key *key = (struct static_key *)table->data;
1629         static DEFINE_MUTEX(static_key_mutex);
1630         int val, ret;
1631         struct ctl_table tmp = {
1632                 .data   = &val,
1633                 .maxlen = sizeof(val),
1634                 .mode   = table->mode,
1635                 .extra1 = SYSCTL_ZERO,
1636                 .extra2 = SYSCTL_ONE,
1637         };
1638
1639         if (write && !capable(CAP_SYS_ADMIN))
1640                 return -EPERM;
1641
1642         mutex_lock(&static_key_mutex);
1643         val = static_key_enabled(key);
1644         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1645         if (write && !ret) {
1646                 if (val)
1647                         static_key_enable(key);
1648                 else
1649                         static_key_disable(key);
1650         }
1651         mutex_unlock(&static_key_mutex);
1652         return ret;
1653 }
1654
1655 static struct ctl_table kern_table[] = {
1656         {
1657                 .procname       = "sched_child_runs_first",
1658                 .data           = &sysctl_sched_child_runs_first,
1659                 .maxlen         = sizeof(unsigned int),
1660                 .mode           = 0644,
1661                 .proc_handler   = proc_dointvec,
1662         },
1663 #ifdef CONFIG_SCHED_DEBUG
1664         {
1665                 .procname       = "sched_min_granularity_ns",
1666                 .data           = &sysctl_sched_min_granularity,
1667                 .maxlen         = sizeof(unsigned int),
1668                 .mode           = 0644,
1669                 .proc_handler   = sched_proc_update_handler,
1670                 .extra1         = &min_sched_granularity_ns,
1671                 .extra2         = &max_sched_granularity_ns,
1672         },
1673         {
1674                 .procname       = "sched_latency_ns",
1675                 .data           = &sysctl_sched_latency,
1676                 .maxlen         = sizeof(unsigned int),
1677                 .mode           = 0644,
1678                 .proc_handler   = sched_proc_update_handler,
1679                 .extra1         = &min_sched_granularity_ns,
1680                 .extra2         = &max_sched_granularity_ns,
1681         },
1682         {
1683                 .procname       = "sched_wakeup_granularity_ns",
1684                 .data           = &sysctl_sched_wakeup_granularity,
1685                 .maxlen         = sizeof(unsigned int),
1686                 .mode           = 0644,
1687                 .proc_handler   = sched_proc_update_handler,
1688                 .extra1         = &min_wakeup_granularity_ns,
1689                 .extra2         = &max_wakeup_granularity_ns,
1690         },
1691 #ifdef CONFIG_SMP
1692         {
1693                 .procname       = "sched_tunable_scaling",
1694                 .data           = &sysctl_sched_tunable_scaling,
1695                 .maxlen         = sizeof(enum sched_tunable_scaling),
1696                 .mode           = 0644,
1697                 .proc_handler   = sched_proc_update_handler,
1698                 .extra1         = &min_sched_tunable_scaling,
1699                 .extra2         = &max_sched_tunable_scaling,
1700         },
1701         {
1702                 .procname       = "sched_migration_cost_ns",
1703                 .data           = &sysctl_sched_migration_cost,
1704                 .maxlen         = sizeof(unsigned int),
1705                 .mode           = 0644,
1706                 .proc_handler   = proc_dointvec,
1707         },
1708         {
1709                 .procname       = "sched_nr_migrate",
1710                 .data           = &sysctl_sched_nr_migrate,
1711                 .maxlen         = sizeof(unsigned int),
1712                 .mode           = 0644,
1713                 .proc_handler   = proc_dointvec,
1714         },
1715 #ifdef CONFIG_SCHEDSTATS
1716         {
1717                 .procname       = "sched_schedstats",
1718                 .data           = NULL,
1719                 .maxlen         = sizeof(unsigned int),
1720                 .mode           = 0644,
1721                 .proc_handler   = sysctl_schedstats,
1722                 .extra1         = SYSCTL_ZERO,
1723                 .extra2         = SYSCTL_ONE,
1724         },
1725 #endif /* CONFIG_SCHEDSTATS */
1726 #endif /* CONFIG_SMP */
1727 #ifdef CONFIG_NUMA_BALANCING
1728         {
1729                 .procname       = "numa_balancing_scan_delay_ms",
1730                 .data           = &sysctl_numa_balancing_scan_delay,
1731                 .maxlen         = sizeof(unsigned int),
1732                 .mode           = 0644,
1733                 .proc_handler   = proc_dointvec,
1734         },
1735         {
1736                 .procname       = "numa_balancing_scan_period_min_ms",
1737                 .data           = &sysctl_numa_balancing_scan_period_min,
1738                 .maxlen         = sizeof(unsigned int),
1739                 .mode           = 0644,
1740                 .proc_handler   = proc_dointvec,
1741         },
1742         {
1743                 .procname       = "numa_balancing_scan_period_max_ms",
1744                 .data           = &sysctl_numa_balancing_scan_period_max,
1745                 .maxlen         = sizeof(unsigned int),
1746                 .mode           = 0644,
1747                 .proc_handler   = proc_dointvec,
1748         },
1749         {
1750                 .procname       = "numa_balancing_scan_size_mb",
1751                 .data           = &sysctl_numa_balancing_scan_size,
1752                 .maxlen         = sizeof(unsigned int),
1753                 .mode           = 0644,
1754                 .proc_handler   = proc_dointvec_minmax,
1755                 .extra1         = SYSCTL_ONE,
1756         },
1757         {
1758                 .procname       = "numa_balancing",
1759                 .data           = NULL, /* filled in by handler */
1760                 .maxlen         = sizeof(unsigned int),
1761                 .mode           = 0644,
1762                 .proc_handler   = sysctl_numa_balancing,
1763                 .extra1         = SYSCTL_ZERO,
1764                 .extra2         = SYSCTL_ONE,
1765         },
1766 #endif /* CONFIG_NUMA_BALANCING */
1767 #endif /* CONFIG_SCHED_DEBUG */
1768         {
1769                 .procname       = "sched_rt_period_us",
1770                 .data           = &sysctl_sched_rt_period,
1771                 .maxlen         = sizeof(unsigned int),
1772                 .mode           = 0644,
1773                 .proc_handler   = sched_rt_handler,
1774         },
1775         {
1776                 .procname       = "sched_rt_runtime_us",
1777                 .data           = &sysctl_sched_rt_runtime,
1778                 .maxlen         = sizeof(int),
1779                 .mode           = 0644,
1780                 .proc_handler   = sched_rt_handler,
1781         },
1782         {
1783                 .procname       = "sched_rr_timeslice_ms",
1784                 .data           = &sysctl_sched_rr_timeslice,
1785                 .maxlen         = sizeof(int),
1786                 .mode           = 0644,
1787                 .proc_handler   = sched_rr_handler,
1788         },
1789 #ifdef CONFIG_UCLAMP_TASK
1790         {
1791                 .procname       = "sched_util_clamp_min",
1792                 .data           = &sysctl_sched_uclamp_util_min,
1793                 .maxlen         = sizeof(unsigned int),
1794                 .mode           = 0644,
1795                 .proc_handler   = sysctl_sched_uclamp_handler,
1796         },
1797         {
1798                 .procname       = "sched_util_clamp_max",
1799                 .data           = &sysctl_sched_uclamp_util_max,
1800                 .maxlen         = sizeof(unsigned int),
1801                 .mode           = 0644,
1802                 .proc_handler   = sysctl_sched_uclamp_handler,
1803         },
1804 #endif
1805 #ifdef CONFIG_SCHED_AUTOGROUP
1806         {
1807                 .procname       = "sched_autogroup_enabled",
1808                 .data           = &sysctl_sched_autogroup_enabled,
1809                 .maxlen         = sizeof(unsigned int),
1810                 .mode           = 0644,
1811                 .proc_handler   = proc_dointvec_minmax,
1812                 .extra1         = SYSCTL_ZERO,
1813                 .extra2         = SYSCTL_ONE,
1814         },
1815 #endif
1816 #ifdef CONFIG_CFS_BANDWIDTH
1817         {
1818                 .procname       = "sched_cfs_bandwidth_slice_us",
1819                 .data           = &sysctl_sched_cfs_bandwidth_slice,
1820                 .maxlen         = sizeof(unsigned int),
1821                 .mode           = 0644,
1822                 .proc_handler   = proc_dointvec_minmax,
1823                 .extra1         = SYSCTL_ONE,
1824         },
1825 #endif
1826 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1827         {
1828                 .procname       = "sched_energy_aware",
1829                 .data           = &sysctl_sched_energy_aware,
1830                 .maxlen         = sizeof(unsigned int),
1831                 .mode           = 0644,
1832                 .proc_handler   = sched_energy_aware_handler,
1833                 .extra1         = SYSCTL_ZERO,
1834                 .extra2         = SYSCTL_ONE,
1835         },
1836 #endif
1837 #ifdef CONFIG_PROVE_LOCKING
1838         {
1839                 .procname       = "prove_locking",
1840                 .data           = &prove_locking,
1841                 .maxlen         = sizeof(int),
1842                 .mode           = 0644,
1843                 .proc_handler   = proc_dointvec,
1844         },
1845 #endif
1846 #ifdef CONFIG_LOCK_STAT
1847         {
1848                 .procname       = "lock_stat",
1849                 .data           = &lock_stat,
1850                 .maxlen         = sizeof(int),
1851                 .mode           = 0644,
1852                 .proc_handler   = proc_dointvec,
1853         },
1854 #endif
1855         {
1856                 .procname       = "panic",
1857                 .data           = &panic_timeout,
1858                 .maxlen         = sizeof(int),
1859                 .mode           = 0644,
1860                 .proc_handler   = proc_dointvec,
1861         },
1862 #ifdef CONFIG_COREDUMP
1863         {
1864                 .procname       = "core_uses_pid",
1865                 .data           = &core_uses_pid,
1866                 .maxlen         = sizeof(int),
1867                 .mode           = 0644,
1868                 .proc_handler   = proc_dointvec,
1869         },
1870         {
1871                 .procname       = "core_pattern",
1872                 .data           = core_pattern,
1873                 .maxlen         = CORENAME_MAX_SIZE,
1874                 .mode           = 0644,
1875                 .proc_handler   = proc_dostring_coredump,
1876         },
1877         {
1878                 .procname       = "core_pipe_limit",
1879                 .data           = &core_pipe_limit,
1880                 .maxlen         = sizeof(unsigned int),
1881                 .mode           = 0644,
1882                 .proc_handler   = proc_dointvec,
1883         },
1884 #endif
1885 #ifdef CONFIG_PROC_SYSCTL
1886         {
1887                 .procname       = "tainted",
1888                 .maxlen         = sizeof(long),
1889                 .mode           = 0644,
1890                 .proc_handler   = proc_taint,
1891         },
1892         {
1893                 .procname       = "sysctl_writes_strict",
1894                 .data           = &sysctl_writes_strict,
1895                 .maxlen         = sizeof(int),
1896                 .mode           = 0644,
1897                 .proc_handler   = proc_dointvec_minmax,
1898                 .extra1         = &neg_one,
1899                 .extra2         = SYSCTL_ONE,
1900         },
1901 #endif
1902 #ifdef CONFIG_LATENCYTOP
1903         {
1904                 .procname       = "latencytop",
1905                 .data           = &latencytop_enabled,
1906                 .maxlen         = sizeof(int),
1907                 .mode           = 0644,
1908                 .proc_handler   = sysctl_latencytop,
1909         },
1910 #endif
1911 #ifdef CONFIG_BLK_DEV_INITRD
1912         {
1913                 .procname       = "real-root-dev",
1914                 .data           = &real_root_dev,
1915                 .maxlen         = sizeof(int),
1916                 .mode           = 0644,
1917                 .proc_handler   = proc_dointvec,
1918         },
1919 #endif
1920         {
1921                 .procname       = "print-fatal-signals",
1922                 .data           = &print_fatal_signals,
1923                 .maxlen         = sizeof(int),
1924                 .mode           = 0644,
1925                 .proc_handler   = proc_dointvec,
1926         },
1927 #ifdef CONFIG_SPARC
1928         {
1929                 .procname       = "reboot-cmd",
1930                 .data           = reboot_command,
1931                 .maxlen         = 256,
1932                 .mode           = 0644,
1933                 .proc_handler   = proc_dostring,
1934         },
1935         {
1936                 .procname       = "stop-a",
1937                 .data           = &stop_a_enabled,
1938                 .maxlen         = sizeof (int),
1939                 .mode           = 0644,
1940                 .proc_handler   = proc_dointvec,
1941         },
1942         {
1943                 .procname       = "scons-poweroff",
1944                 .data           = &scons_pwroff,
1945                 .maxlen         = sizeof (int),
1946                 .mode           = 0644,
1947                 .proc_handler   = proc_dointvec,
1948         },
1949 #endif
1950 #ifdef CONFIG_SPARC64
1951         {
1952                 .procname       = "tsb-ratio",
1953                 .data           = &sysctl_tsb_ratio,
1954                 .maxlen         = sizeof (int),
1955                 .mode           = 0644,
1956                 .proc_handler   = proc_dointvec,
1957         },
1958 #endif
1959 #ifdef CONFIG_PARISC
1960         {
1961                 .procname       = "soft-power",
1962                 .data           = &pwrsw_enabled,
1963                 .maxlen         = sizeof (int),
1964                 .mode           = 0644,
1965                 .proc_handler   = proc_dointvec,
1966         },
1967 #endif
1968 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1969         {
1970                 .procname       = "unaligned-trap",
1971                 .data           = &unaligned_enabled,
1972                 .maxlen         = sizeof (int),
1973                 .mode           = 0644,
1974                 .proc_handler   = proc_dointvec,
1975         },
1976 #endif
1977         {
1978                 .procname       = "ctrl-alt-del",
1979                 .data           = &C_A_D,
1980                 .maxlen         = sizeof(int),
1981                 .mode           = 0644,
1982                 .proc_handler   = proc_dointvec,
1983         },
1984 #ifdef CONFIG_FUNCTION_TRACER
1985         {
1986                 .procname       = "ftrace_enabled",
1987                 .data           = &ftrace_enabled,
1988                 .maxlen         = sizeof(int),
1989                 .mode           = 0644,
1990                 .proc_handler   = ftrace_enable_sysctl,
1991         },
1992 #endif
1993 #ifdef CONFIG_STACK_TRACER
1994         {
1995                 .procname       = "stack_tracer_enabled",
1996                 .data           = &stack_tracer_enabled,
1997                 .maxlen         = sizeof(int),
1998                 .mode           = 0644,
1999                 .proc_handler   = stack_trace_sysctl,
2000         },
2001 #endif
2002 #ifdef CONFIG_TRACING
2003         {
2004                 .procname       = "ftrace_dump_on_oops",
2005                 .data           = &ftrace_dump_on_oops,
2006                 .maxlen         = sizeof(int),
2007                 .mode           = 0644,
2008                 .proc_handler   = proc_dointvec,
2009         },
2010         {
2011                 .procname       = "traceoff_on_warning",
2012                 .data           = &__disable_trace_on_warning,
2013                 .maxlen         = sizeof(__disable_trace_on_warning),
2014                 .mode           = 0644,
2015                 .proc_handler   = proc_dointvec,
2016         },
2017         {
2018                 .procname       = "tracepoint_printk",
2019                 .data           = &tracepoint_printk,
2020                 .maxlen         = sizeof(tracepoint_printk),
2021                 .mode           = 0644,
2022                 .proc_handler   = tracepoint_printk_sysctl,
2023         },
2024 #endif
2025 #ifdef CONFIG_KEXEC_CORE
2026         {
2027                 .procname       = "kexec_load_disabled",
2028                 .data           = &kexec_load_disabled,
2029                 .maxlen         = sizeof(int),
2030                 .mode           = 0644,
2031                 /* only handle a transition from default "0" to "1" */
2032                 .proc_handler   = proc_dointvec_minmax,
2033                 .extra1         = SYSCTL_ONE,
2034                 .extra2         = SYSCTL_ONE,
2035         },
2036 #endif
2037 #ifdef CONFIG_MODULES
2038         {
2039                 .procname       = "modprobe",
2040                 .data           = &modprobe_path,
2041                 .maxlen         = KMOD_PATH_LEN,
2042                 .mode           = 0644,
2043                 .proc_handler   = proc_dostring,
2044         },
2045         {
2046                 .procname       = "modules_disabled",
2047                 .data           = &modules_disabled,
2048                 .maxlen         = sizeof(int),
2049                 .mode           = 0644,
2050                 /* only handle a transition from default "0" to "1" */
2051                 .proc_handler   = proc_dointvec_minmax,
2052                 .extra1         = SYSCTL_ONE,
2053                 .extra2         = SYSCTL_ONE,
2054         },
2055 #endif
2056 #ifdef CONFIG_UEVENT_HELPER
2057         {
2058                 .procname       = "hotplug",
2059                 .data           = &uevent_helper,
2060                 .maxlen         = UEVENT_HELPER_PATH_LEN,
2061                 .mode           = 0644,
2062                 .proc_handler   = proc_dostring,
2063         },
2064 #endif
2065 #ifdef CONFIG_CHR_DEV_SG
2066         {
2067                 .procname       = "sg-big-buff",
2068                 .data           = &sg_big_buff,
2069                 .maxlen         = sizeof (int),
2070                 .mode           = 0444,
2071                 .proc_handler   = proc_dointvec,
2072         },
2073 #endif
2074 #ifdef CONFIG_BSD_PROCESS_ACCT
2075         {
2076                 .procname       = "acct",
2077                 .data           = &acct_parm,
2078                 .maxlen         = 3*sizeof(int),
2079                 .mode           = 0644,
2080                 .proc_handler   = proc_dointvec,
2081         },
2082 #endif
2083 #ifdef CONFIG_MAGIC_SYSRQ
2084         {
2085                 .procname       = "sysrq",
2086                 .data           = NULL,
2087                 .maxlen         = sizeof (int),
2088                 .mode           = 0644,
2089                 .proc_handler   = sysrq_sysctl_handler,
2090         },
2091 #endif
2092 #ifdef CONFIG_PROC_SYSCTL
2093         {
2094                 .procname       = "cad_pid",
2095                 .data           = NULL,
2096                 .maxlen         = sizeof (int),
2097                 .mode           = 0600,
2098                 .proc_handler   = proc_do_cad_pid,
2099         },
2100 #endif
2101         {
2102                 .procname       = "threads-max",
2103                 .data           = NULL,
2104                 .maxlen         = sizeof(int),
2105                 .mode           = 0644,
2106                 .proc_handler   = sysctl_max_threads,
2107         },
2108         {
2109                 .procname       = "random",
2110                 .mode           = 0555,
2111                 .child          = random_table,
2112         },
2113         {
2114                 .procname       = "usermodehelper",
2115                 .mode           = 0555,
2116                 .child          = usermodehelper_table,
2117         },
2118 #ifdef CONFIG_FW_LOADER_USER_HELPER
2119         {
2120                 .procname       = "firmware_config",
2121                 .mode           = 0555,
2122                 .child          = firmware_config_table,
2123         },
2124 #endif
2125         {
2126                 .procname       = "overflowuid",
2127                 .data           = &overflowuid,
2128                 .maxlen         = sizeof(int),
2129                 .mode           = 0644,
2130                 .proc_handler   = proc_dointvec_minmax,
2131                 .extra1         = &minolduid,
2132                 .extra2         = &maxolduid,
2133         },
2134         {
2135                 .procname       = "overflowgid",
2136                 .data           = &overflowgid,
2137                 .maxlen         = sizeof(int),
2138                 .mode           = 0644,
2139                 .proc_handler   = proc_dointvec_minmax,
2140                 .extra1         = &minolduid,
2141                 .extra2         = &maxolduid,
2142         },
2143 #ifdef CONFIG_S390
2144         {
2145                 .procname       = "userprocess_debug",
2146                 .data           = &show_unhandled_signals,
2147                 .maxlen         = sizeof(int),
2148                 .mode           = 0644,
2149                 .proc_handler   = proc_dointvec,
2150         },
2151 #endif
2152 #ifdef CONFIG_SMP
2153         {
2154                 .procname       = "oops_all_cpu_backtrace",
2155                 .data           = &sysctl_oops_all_cpu_backtrace,
2156                 .maxlen         = sizeof(int),
2157                 .mode           = 0644,
2158                 .proc_handler   = proc_dointvec_minmax,
2159                 .extra1         = SYSCTL_ZERO,
2160                 .extra2         = SYSCTL_ONE,
2161         },
2162 #endif /* CONFIG_SMP */
2163         {
2164                 .procname       = "pid_max",
2165                 .data           = &pid_max,
2166                 .maxlen         = sizeof (int),
2167                 .mode           = 0644,
2168                 .proc_handler   = proc_dointvec_minmax,
2169                 .extra1         = &pid_max_min,
2170                 .extra2         = &pid_max_max,
2171         },
2172         {
2173                 .procname       = "panic_on_oops",
2174                 .data           = &panic_on_oops,
2175                 .maxlen         = sizeof(int),
2176                 .mode           = 0644,
2177                 .proc_handler   = proc_dointvec,
2178         },
2179         {
2180                 .procname       = "panic_print",
2181                 .data           = &panic_print,
2182                 .maxlen         = sizeof(unsigned long),
2183                 .mode           = 0644,
2184                 .proc_handler   = proc_doulongvec_minmax,
2185         },
2186 #if defined CONFIG_PRINTK
2187         {
2188                 .procname       = "printk",
2189                 .data           = &console_loglevel,
2190                 .maxlen         = 4*sizeof(int),
2191                 .mode           = 0644,
2192                 .proc_handler   = proc_dointvec,
2193         },
2194         {
2195                 .procname       = "printk_ratelimit",
2196                 .data           = &printk_ratelimit_state.interval,
2197                 .maxlen         = sizeof(int),
2198                 .mode           = 0644,
2199                 .proc_handler   = proc_dointvec_jiffies,
2200         },
2201         {
2202                 .procname       = "printk_ratelimit_burst",
2203                 .data           = &printk_ratelimit_state.burst,
2204                 .maxlen         = sizeof(int),
2205                 .mode           = 0644,
2206                 .proc_handler   = proc_dointvec,
2207         },
2208         {
2209                 .procname       = "printk_delay",
2210                 .data           = &printk_delay_msec,
2211                 .maxlen         = sizeof(int),
2212                 .mode           = 0644,
2213                 .proc_handler   = proc_dointvec_minmax,
2214                 .extra1         = SYSCTL_ZERO,
2215                 .extra2         = &ten_thousand,
2216         },
2217         {
2218                 .procname       = "printk_devkmsg",
2219                 .data           = devkmsg_log_str,
2220                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
2221                 .mode           = 0644,
2222                 .proc_handler   = devkmsg_sysctl_set_loglvl,
2223         },
2224         {
2225                 .procname       = "dmesg_restrict",
2226                 .data           = &dmesg_restrict,
2227                 .maxlen         = sizeof(int),
2228                 .mode           = 0644,
2229                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2230                 .extra1         = SYSCTL_ZERO,
2231                 .extra2         = SYSCTL_ONE,
2232         },
2233         {
2234                 .procname       = "kptr_restrict",
2235                 .data           = &kptr_restrict,
2236                 .maxlen         = sizeof(int),
2237                 .mode           = 0644,
2238                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2239                 .extra1         = SYSCTL_ZERO,
2240                 .extra2         = &two,
2241         },
2242 #endif
2243         {
2244                 .procname       = "ngroups_max",
2245                 .data           = &ngroups_max,
2246                 .maxlen         = sizeof (int),
2247                 .mode           = 0444,
2248                 .proc_handler   = proc_dointvec,
2249         },
2250         {
2251                 .procname       = "cap_last_cap",
2252                 .data           = (void *)&cap_last_cap,
2253                 .maxlen         = sizeof(int),
2254                 .mode           = 0444,
2255                 .proc_handler   = proc_dointvec,
2256         },
2257 #if defined(CONFIG_LOCKUP_DETECTOR)
2258         {
2259                 .procname       = "watchdog",
2260                 .data           = &watchdog_user_enabled,
2261                 .maxlen         = sizeof(int),
2262                 .mode           = 0644,
2263                 .proc_handler   = proc_watchdog,
2264                 .extra1         = SYSCTL_ZERO,
2265                 .extra2         = SYSCTL_ONE,
2266         },
2267         {
2268                 .procname       = "watchdog_thresh",
2269                 .data           = &watchdog_thresh,
2270                 .maxlen         = sizeof(int),
2271                 .mode           = 0644,
2272                 .proc_handler   = proc_watchdog_thresh,
2273                 .extra1         = SYSCTL_ZERO,
2274                 .extra2         = &sixty,
2275         },
2276         {
2277                 .procname       = "nmi_watchdog",
2278                 .data           = &nmi_watchdog_user_enabled,
2279                 .maxlen         = sizeof(int),
2280                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
2281                 .proc_handler   = proc_nmi_watchdog,
2282                 .extra1         = SYSCTL_ZERO,
2283                 .extra2         = SYSCTL_ONE,
2284         },
2285         {
2286                 .procname       = "watchdog_cpumask",
2287                 .data           = &watchdog_cpumask_bits,
2288                 .maxlen         = NR_CPUS,
2289                 .mode           = 0644,
2290                 .proc_handler   = proc_watchdog_cpumask,
2291         },
2292 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2293         {
2294                 .procname       = "soft_watchdog",
2295                 .data           = &soft_watchdog_user_enabled,
2296                 .maxlen         = sizeof(int),
2297                 .mode           = 0644,
2298                 .proc_handler   = proc_soft_watchdog,
2299                 .extra1         = SYSCTL_ZERO,
2300                 .extra2         = SYSCTL_ONE,
2301         },
2302         {
2303                 .procname       = "softlockup_panic",
2304                 .data           = &softlockup_panic,
2305                 .maxlen         = sizeof(int),
2306                 .mode           = 0644,
2307                 .proc_handler   = proc_dointvec_minmax,
2308                 .extra1         = SYSCTL_ZERO,
2309                 .extra2         = SYSCTL_ONE,
2310         },
2311 #ifdef CONFIG_SMP
2312         {
2313                 .procname       = "softlockup_all_cpu_backtrace",
2314                 .data           = &sysctl_softlockup_all_cpu_backtrace,
2315                 .maxlen         = sizeof(int),
2316                 .mode           = 0644,
2317                 .proc_handler   = proc_dointvec_minmax,
2318                 .extra1         = SYSCTL_ZERO,
2319                 .extra2         = SYSCTL_ONE,
2320         },
2321 #endif /* CONFIG_SMP */
2322 #endif
2323 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2324         {
2325                 .procname       = "hardlockup_panic",
2326                 .data           = &hardlockup_panic,
2327                 .maxlen         = sizeof(int),
2328                 .mode           = 0644,
2329                 .proc_handler   = proc_dointvec_minmax,
2330                 .extra1         = SYSCTL_ZERO,
2331                 .extra2         = SYSCTL_ONE,
2332         },
2333 #ifdef CONFIG_SMP
2334         {
2335                 .procname       = "hardlockup_all_cpu_backtrace",
2336                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
2337                 .maxlen         = sizeof(int),
2338                 .mode           = 0644,
2339                 .proc_handler   = proc_dointvec_minmax,
2340                 .extra1         = SYSCTL_ZERO,
2341                 .extra2         = SYSCTL_ONE,
2342         },
2343 #endif /* CONFIG_SMP */
2344 #endif
2345 #endif
2346
2347 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2348         {
2349                 .procname       = "unknown_nmi_panic",
2350                 .data           = &unknown_nmi_panic,
2351                 .maxlen         = sizeof (int),
2352                 .mode           = 0644,
2353                 .proc_handler   = proc_dointvec,
2354         },
2355 #endif
2356
2357 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2358         defined(CONFIG_DEBUG_STACKOVERFLOW)
2359         {
2360                 .procname       = "panic_on_stackoverflow",
2361                 .data           = &sysctl_panic_on_stackoverflow,
2362                 .maxlen         = sizeof(int),
2363                 .mode           = 0644,
2364                 .proc_handler   = proc_dointvec,
2365         },
2366 #endif
2367 #if defined(CONFIG_X86)
2368         {
2369                 .procname       = "panic_on_unrecovered_nmi",
2370                 .data           = &panic_on_unrecovered_nmi,
2371                 .maxlen         = sizeof(int),
2372                 .mode           = 0644,
2373                 .proc_handler   = proc_dointvec,
2374         },
2375         {
2376                 .procname       = "panic_on_io_nmi",
2377                 .data           = &panic_on_io_nmi,
2378                 .maxlen         = sizeof(int),
2379                 .mode           = 0644,
2380                 .proc_handler   = proc_dointvec,
2381         },
2382         {
2383                 .procname       = "bootloader_type",
2384                 .data           = &bootloader_type,
2385                 .maxlen         = sizeof (int),
2386                 .mode           = 0444,
2387                 .proc_handler   = proc_dointvec,
2388         },
2389         {
2390                 .procname       = "bootloader_version",
2391                 .data           = &bootloader_version,
2392                 .maxlen         = sizeof (int),
2393                 .mode           = 0444,
2394                 .proc_handler   = proc_dointvec,
2395         },
2396         {
2397                 .procname       = "io_delay_type",
2398                 .data           = &io_delay_type,
2399                 .maxlen         = sizeof(int),
2400                 .mode           = 0644,
2401                 .proc_handler   = proc_dointvec,
2402         },
2403 #endif
2404 #if defined(CONFIG_MMU)
2405         {
2406                 .procname       = "randomize_va_space",
2407                 .data           = &randomize_va_space,
2408                 .maxlen         = sizeof(int),
2409                 .mode           = 0644,
2410                 .proc_handler   = proc_dointvec,
2411         },
2412 #endif
2413 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2414         {
2415                 .procname       = "spin_retry",
2416                 .data           = &spin_retry,
2417                 .maxlen         = sizeof (int),
2418                 .mode           = 0644,
2419                 .proc_handler   = proc_dointvec,
2420         },
2421 #endif
2422 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2423         {
2424                 .procname       = "acpi_video_flags",
2425                 .data           = &acpi_realmode_flags,
2426                 .maxlen         = sizeof (unsigned long),
2427                 .mode           = 0644,
2428                 .proc_handler   = proc_doulongvec_minmax,
2429         },
2430 #endif
2431 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2432         {
2433                 .procname       = "ignore-unaligned-usertrap",
2434                 .data           = &no_unaligned_warning,
2435                 .maxlen         = sizeof (int),
2436                 .mode           = 0644,
2437                 .proc_handler   = proc_dointvec,
2438         },
2439 #endif
2440 #ifdef CONFIG_IA64
2441         {
2442                 .procname       = "unaligned-dump-stack",
2443                 .data           = &unaligned_dump_stack,
2444                 .maxlen         = sizeof (int),
2445                 .mode           = 0644,
2446                 .proc_handler   = proc_dointvec,
2447         },
2448 #endif
2449 #ifdef CONFIG_DETECT_HUNG_TASK
2450 #ifdef CONFIG_SMP
2451         {
2452                 .procname       = "hung_task_all_cpu_backtrace",
2453                 .data           = &sysctl_hung_task_all_cpu_backtrace,
2454                 .maxlen         = sizeof(int),
2455                 .mode           = 0644,
2456                 .proc_handler   = proc_dointvec_minmax,
2457                 .extra1         = SYSCTL_ZERO,
2458                 .extra2         = SYSCTL_ONE,
2459         },
2460 #endif /* CONFIG_SMP */
2461         {
2462                 .procname       = "hung_task_panic",
2463                 .data           = &sysctl_hung_task_panic,
2464                 .maxlen         = sizeof(int),
2465                 .mode           = 0644,
2466                 .proc_handler   = proc_dointvec_minmax,
2467                 .extra1         = SYSCTL_ZERO,
2468                 .extra2         = SYSCTL_ONE,
2469         },
2470         {
2471                 .procname       = "hung_task_check_count",
2472                 .data           = &sysctl_hung_task_check_count,
2473                 .maxlen         = sizeof(int),
2474                 .mode           = 0644,
2475                 .proc_handler   = proc_dointvec_minmax,
2476                 .extra1         = SYSCTL_ZERO,
2477         },
2478         {
2479                 .procname       = "hung_task_timeout_secs",
2480                 .data           = &sysctl_hung_task_timeout_secs,
2481                 .maxlen         = sizeof(unsigned long),
2482                 .mode           = 0644,
2483                 .proc_handler   = proc_dohung_task_timeout_secs,
2484                 .extra2         = &hung_task_timeout_max,
2485         },
2486         {
2487                 .procname       = "hung_task_check_interval_secs",
2488                 .data           = &sysctl_hung_task_check_interval_secs,
2489                 .maxlen         = sizeof(unsigned long),
2490                 .mode           = 0644,
2491                 .proc_handler   = proc_dohung_task_timeout_secs,
2492                 .extra2         = &hung_task_timeout_max,
2493         },
2494         {
2495                 .procname       = "hung_task_warnings",
2496                 .data           = &sysctl_hung_task_warnings,
2497                 .maxlen         = sizeof(int),
2498                 .mode           = 0644,
2499                 .proc_handler   = proc_dointvec_minmax,
2500                 .extra1         = &neg_one,
2501         },
2502 #endif
2503 #ifdef CONFIG_RT_MUTEXES
2504         {
2505                 .procname       = "max_lock_depth",
2506                 .data           = &max_lock_depth,
2507                 .maxlen         = sizeof(int),
2508                 .mode           = 0644,
2509                 .proc_handler   = proc_dointvec,
2510         },
2511 #endif
2512         {
2513                 .procname       = "poweroff_cmd",
2514                 .data           = &poweroff_cmd,
2515                 .maxlen         = POWEROFF_CMD_PATH_LEN,
2516                 .mode           = 0644,
2517                 .proc_handler   = proc_dostring,
2518         },
2519 #ifdef CONFIG_KEYS
2520         {
2521                 .procname       = "keys",
2522                 .mode           = 0555,
2523                 .child          = key_sysctls,
2524         },
2525 #endif
2526 #ifdef CONFIG_PERF_EVENTS
2527         /*
2528          * User-space scripts rely on the existence of this file
2529          * as a feature check for perf_events being enabled.
2530          *
2531          * So it's an ABI, do not remove!
2532          */
2533         {
2534                 .procname       = "perf_event_paranoid",
2535                 .data           = &sysctl_perf_event_paranoid,
2536                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
2537                 .mode           = 0644,
2538                 .proc_handler   = proc_dointvec,
2539         },
2540         {
2541                 .procname       = "perf_event_mlock_kb",
2542                 .data           = &sysctl_perf_event_mlock,
2543                 .maxlen         = sizeof(sysctl_perf_event_mlock),
2544                 .mode           = 0644,
2545                 .proc_handler   = proc_dointvec,
2546         },
2547         {
2548                 .procname       = "perf_event_max_sample_rate",
2549                 .data           = &sysctl_perf_event_sample_rate,
2550                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
2551                 .mode           = 0644,
2552                 .proc_handler   = perf_proc_update_handler,
2553                 .extra1         = SYSCTL_ONE,
2554         },
2555         {
2556                 .procname       = "perf_cpu_time_max_percent",
2557                 .data           = &sysctl_perf_cpu_time_max_percent,
2558                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
2559                 .mode           = 0644,
2560                 .proc_handler   = perf_cpu_time_max_percent_handler,
2561                 .extra1         = SYSCTL_ZERO,
2562                 .extra2         = &one_hundred,
2563         },
2564         {
2565                 .procname       = "perf_event_max_stack",
2566                 .data           = &sysctl_perf_event_max_stack,
2567                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
2568                 .mode           = 0644,
2569                 .proc_handler   = perf_event_max_stack_handler,
2570                 .extra1         = SYSCTL_ZERO,
2571                 .extra2         = &six_hundred_forty_kb,
2572         },
2573         {
2574                 .procname       = "perf_event_max_contexts_per_stack",
2575                 .data           = &sysctl_perf_event_max_contexts_per_stack,
2576                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
2577                 .mode           = 0644,
2578                 .proc_handler   = perf_event_max_stack_handler,
2579                 .extra1         = SYSCTL_ZERO,
2580                 .extra2         = &one_thousand,
2581         },
2582 #endif
2583         {
2584                 .procname       = "panic_on_warn",
2585                 .data           = &panic_on_warn,
2586                 .maxlen         = sizeof(int),
2587                 .mode           = 0644,
2588                 .proc_handler   = proc_dointvec_minmax,
2589                 .extra1         = SYSCTL_ZERO,
2590                 .extra2         = SYSCTL_ONE,
2591         },
2592 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2593         {
2594                 .procname       = "timer_migration",
2595                 .data           = &sysctl_timer_migration,
2596                 .maxlen         = sizeof(unsigned int),
2597                 .mode           = 0644,
2598                 .proc_handler   = timer_migration_handler,
2599                 .extra1         = SYSCTL_ZERO,
2600                 .extra2         = SYSCTL_ONE,
2601         },
2602 #endif
2603 #ifdef CONFIG_BPF_SYSCALL
2604         {
2605                 .procname       = "unprivileged_bpf_disabled",
2606                 .data           = &sysctl_unprivileged_bpf_disabled,
2607                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
2608                 .mode           = 0644,
2609                 /* only handle a transition from default "0" to "1" */
2610                 .proc_handler   = proc_dointvec_minmax,
2611                 .extra1         = SYSCTL_ONE,
2612                 .extra2         = SYSCTL_ONE,
2613         },
2614         {
2615                 .procname       = "bpf_stats_enabled",
2616                 .data           = &bpf_stats_enabled_key.key,
2617                 .maxlen         = sizeof(bpf_stats_enabled_key),
2618                 .mode           = 0644,
2619                 .proc_handler   = bpf_stats_handler,
2620         },
2621 #endif
2622 #if defined(CONFIG_TREE_RCU)
2623         {
2624                 .procname       = "panic_on_rcu_stall",
2625                 .data           = &sysctl_panic_on_rcu_stall,
2626                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
2627                 .mode           = 0644,
2628                 .proc_handler   = proc_dointvec_minmax,
2629                 .extra1         = SYSCTL_ZERO,
2630                 .extra2         = SYSCTL_ONE,
2631         },
2632 #endif
2633 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2634         {
2635                 .procname       = "stack_erasing",
2636                 .data           = NULL,
2637                 .maxlen         = sizeof(int),
2638                 .mode           = 0600,
2639                 .proc_handler   = stack_erasing_sysctl,
2640                 .extra1         = SYSCTL_ZERO,
2641                 .extra2         = SYSCTL_ONE,
2642         },
2643 #endif
2644         { }
2645 };
2646
2647 static struct ctl_table vm_table[] = {
2648         {
2649                 .procname       = "overcommit_memory",
2650                 .data           = &sysctl_overcommit_memory,
2651                 .maxlen         = sizeof(sysctl_overcommit_memory),
2652                 .mode           = 0644,
2653                 .proc_handler   = proc_dointvec_minmax,
2654                 .extra1         = SYSCTL_ZERO,
2655                 .extra2         = &two,
2656         },
2657         {
2658                 .procname       = "panic_on_oom",
2659                 .data           = &sysctl_panic_on_oom,
2660                 .maxlen         = sizeof(sysctl_panic_on_oom),
2661                 .mode           = 0644,
2662                 .proc_handler   = proc_dointvec_minmax,
2663                 .extra1         = SYSCTL_ZERO,
2664                 .extra2         = &two,
2665         },
2666         {
2667                 .procname       = "oom_kill_allocating_task",
2668                 .data           = &sysctl_oom_kill_allocating_task,
2669                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
2670                 .mode           = 0644,
2671                 .proc_handler   = proc_dointvec,
2672         },
2673         {
2674                 .procname       = "oom_dump_tasks",
2675                 .data           = &sysctl_oom_dump_tasks,
2676                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
2677                 .mode           = 0644,
2678                 .proc_handler   = proc_dointvec,
2679         },
2680         {
2681                 .procname       = "overcommit_ratio",
2682                 .data           = &sysctl_overcommit_ratio,
2683                 .maxlen         = sizeof(sysctl_overcommit_ratio),
2684                 .mode           = 0644,
2685                 .proc_handler   = overcommit_ratio_handler,
2686         },
2687         {
2688                 .procname       = "overcommit_kbytes",
2689                 .data           = &sysctl_overcommit_kbytes,
2690                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
2691                 .mode           = 0644,
2692                 .proc_handler   = overcommit_kbytes_handler,
2693         },
2694         {
2695                 .procname       = "page-cluster",
2696                 .data           = &page_cluster,
2697                 .maxlen         = sizeof(int),
2698                 .mode           = 0644,
2699                 .proc_handler   = proc_dointvec_minmax,
2700                 .extra1         = SYSCTL_ZERO,
2701         },
2702         {
2703                 .procname       = "dirty_background_ratio",
2704                 .data           = &dirty_background_ratio,
2705                 .maxlen         = sizeof(dirty_background_ratio),
2706                 .mode           = 0644,
2707                 .proc_handler   = dirty_background_ratio_handler,
2708                 .extra1         = SYSCTL_ZERO,
2709                 .extra2         = &one_hundred,
2710         },
2711         {
2712                 .procname       = "dirty_background_bytes",
2713                 .data           = &dirty_background_bytes,
2714                 .maxlen         = sizeof(dirty_background_bytes),
2715                 .mode           = 0644,
2716                 .proc_handler   = dirty_background_bytes_handler,
2717                 .extra1         = &one_ul,
2718         },
2719         {
2720                 .procname       = "dirty_ratio",
2721                 .data           = &vm_dirty_ratio,
2722                 .maxlen         = sizeof(vm_dirty_ratio),
2723                 .mode           = 0644,
2724                 .proc_handler   = dirty_ratio_handler,
2725                 .extra1         = SYSCTL_ZERO,
2726                 .extra2         = &one_hundred,
2727         },
2728         {
2729                 .procname       = "dirty_bytes",
2730                 .data           = &vm_dirty_bytes,
2731                 .maxlen         = sizeof(vm_dirty_bytes),
2732                 .mode           = 0644,
2733                 .proc_handler   = dirty_bytes_handler,
2734                 .extra1         = &dirty_bytes_min,
2735         },
2736         {
2737                 .procname       = "dirty_writeback_centisecs",
2738                 .data           = &dirty_writeback_interval,
2739                 .maxlen         = sizeof(dirty_writeback_interval),
2740                 .mode           = 0644,
2741                 .proc_handler   = dirty_writeback_centisecs_handler,
2742         },
2743         {
2744                 .procname       = "dirty_expire_centisecs",
2745                 .data           = &dirty_expire_interval,
2746                 .maxlen         = sizeof(dirty_expire_interval),
2747                 .mode           = 0644,
2748                 .proc_handler   = proc_dointvec_minmax,
2749                 .extra1         = SYSCTL_ZERO,
2750         },
2751         {
2752                 .procname       = "dirtytime_expire_seconds",
2753                 .data           = &dirtytime_expire_interval,
2754                 .maxlen         = sizeof(dirtytime_expire_interval),
2755                 .mode           = 0644,
2756                 .proc_handler   = dirtytime_interval_handler,
2757                 .extra1         = SYSCTL_ZERO,
2758         },
2759         {
2760                 .procname       = "swappiness",
2761                 .data           = &vm_swappiness,
2762                 .maxlen         = sizeof(vm_swappiness),
2763                 .mode           = 0644,
2764                 .proc_handler   = proc_dointvec_minmax,
2765                 .extra1         = SYSCTL_ZERO,
2766                 .extra2         = &two_hundred,
2767         },
2768 #ifdef CONFIG_HUGETLB_PAGE
2769         {
2770                 .procname       = "nr_hugepages",
2771                 .data           = NULL,
2772                 .maxlen         = sizeof(unsigned long),
2773                 .mode           = 0644,
2774                 .proc_handler   = hugetlb_sysctl_handler,
2775         },
2776 #ifdef CONFIG_NUMA
2777         {
2778                 .procname       = "nr_hugepages_mempolicy",
2779                 .data           = NULL,
2780                 .maxlen         = sizeof(unsigned long),
2781                 .mode           = 0644,
2782                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
2783         },
2784         {
2785                 .procname               = "numa_stat",
2786                 .data                   = &sysctl_vm_numa_stat,
2787                 .maxlen                 = sizeof(int),
2788                 .mode                   = 0644,
2789                 .proc_handler   = sysctl_vm_numa_stat_handler,
2790                 .extra1                 = SYSCTL_ZERO,
2791                 .extra2                 = SYSCTL_ONE,
2792         },
2793 #endif
2794          {
2795                 .procname       = "hugetlb_shm_group",
2796                 .data           = &sysctl_hugetlb_shm_group,
2797                 .maxlen         = sizeof(gid_t),
2798                 .mode           = 0644,
2799                 .proc_handler   = proc_dointvec,
2800          },
2801         {
2802                 .procname       = "nr_overcommit_hugepages",
2803                 .data           = NULL,
2804                 .maxlen         = sizeof(unsigned long),
2805                 .mode           = 0644,
2806                 .proc_handler   = hugetlb_overcommit_handler,
2807         },
2808 #endif
2809         {
2810                 .procname       = "lowmem_reserve_ratio",
2811                 .data           = &sysctl_lowmem_reserve_ratio,
2812                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
2813                 .mode           = 0644,
2814                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
2815         },
2816         {
2817                 .procname       = "drop_caches",
2818                 .data           = &sysctl_drop_caches,
2819                 .maxlen         = sizeof(int),
2820                 .mode           = 0200,
2821                 .proc_handler   = drop_caches_sysctl_handler,
2822                 .extra1         = SYSCTL_ONE,
2823                 .extra2         = &four,
2824         },
2825 #ifdef CONFIG_COMPACTION
2826         {
2827                 .procname       = "compact_memory",
2828                 .data           = &sysctl_compact_memory,
2829                 .maxlen         = sizeof(int),
2830                 .mode           = 0200,
2831                 .proc_handler   = sysctl_compaction_handler,
2832         },
2833         {
2834                 .procname       = "extfrag_threshold",
2835                 .data           = &sysctl_extfrag_threshold,
2836                 .maxlen         = sizeof(int),
2837                 .mode           = 0644,
2838                 .proc_handler   = proc_dointvec_minmax,
2839                 .extra1         = &min_extfrag_threshold,
2840                 .extra2         = &max_extfrag_threshold,
2841         },
2842         {
2843                 .procname       = "compact_unevictable_allowed",
2844                 .data           = &sysctl_compact_unevictable_allowed,
2845                 .maxlen         = sizeof(int),
2846                 .mode           = 0644,
2847                 .proc_handler   = proc_dointvec_minmax_warn_RT_change,
2848                 .extra1         = SYSCTL_ZERO,
2849                 .extra2         = SYSCTL_ONE,
2850         },
2851
2852 #endif /* CONFIG_COMPACTION */
2853         {
2854                 .procname       = "min_free_kbytes",
2855                 .data           = &min_free_kbytes,
2856                 .maxlen         = sizeof(min_free_kbytes),
2857                 .mode           = 0644,
2858                 .proc_handler   = min_free_kbytes_sysctl_handler,
2859                 .extra1         = SYSCTL_ZERO,
2860         },
2861         {
2862                 .procname       = "watermark_boost_factor",
2863                 .data           = &watermark_boost_factor,
2864                 .maxlen         = sizeof(watermark_boost_factor),
2865                 .mode           = 0644,
2866                 .proc_handler   = proc_dointvec_minmax,
2867                 .extra1         = SYSCTL_ZERO,
2868         },
2869         {
2870                 .procname       = "watermark_scale_factor",
2871                 .data           = &watermark_scale_factor,
2872                 .maxlen         = sizeof(watermark_scale_factor),
2873                 .mode           = 0644,
2874                 .proc_handler   = watermark_scale_factor_sysctl_handler,
2875                 .extra1         = SYSCTL_ONE,
2876                 .extra2         = &one_thousand,
2877         },
2878         {
2879                 .procname       = "percpu_pagelist_fraction",
2880                 .data           = &percpu_pagelist_fraction,
2881                 .maxlen         = sizeof(percpu_pagelist_fraction),
2882                 .mode           = 0644,
2883                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
2884                 .extra1         = SYSCTL_ZERO,
2885         },
2886 #ifdef CONFIG_MMU
2887         {
2888                 .procname       = "max_map_count",
2889                 .data           = &sysctl_max_map_count,
2890                 .maxlen         = sizeof(sysctl_max_map_count),
2891                 .mode           = 0644,
2892                 .proc_handler   = proc_dointvec_minmax,
2893                 .extra1         = SYSCTL_ZERO,
2894         },
2895 #else
2896         {
2897                 .procname       = "nr_trim_pages",
2898                 .data           = &sysctl_nr_trim_pages,
2899                 .maxlen         = sizeof(sysctl_nr_trim_pages),
2900                 .mode           = 0644,
2901                 .proc_handler   = proc_dointvec_minmax,
2902                 .extra1         = SYSCTL_ZERO,
2903         },
2904 #endif
2905         {
2906                 .procname       = "laptop_mode",
2907                 .data           = &laptop_mode,
2908                 .maxlen         = sizeof(laptop_mode),
2909                 .mode           = 0644,
2910                 .proc_handler   = proc_dointvec_jiffies,
2911         },
2912         {
2913                 .procname       = "block_dump",
2914                 .data           = &block_dump,
2915                 .maxlen         = sizeof(block_dump),
2916                 .mode           = 0644,
2917                 .proc_handler   = proc_dointvec,
2918                 .extra1         = SYSCTL_ZERO,
2919         },
2920         {
2921                 .procname       = "vfs_cache_pressure",
2922                 .data           = &sysctl_vfs_cache_pressure,
2923                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
2924                 .mode           = 0644,
2925                 .proc_handler   = proc_dointvec,
2926                 .extra1         = SYSCTL_ZERO,
2927         },
2928 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2929     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2930         {
2931                 .procname       = "legacy_va_layout",
2932                 .data           = &sysctl_legacy_va_layout,
2933                 .maxlen         = sizeof(sysctl_legacy_va_layout),
2934                 .mode           = 0644,
2935                 .proc_handler   = proc_dointvec,
2936                 .extra1         = SYSCTL_ZERO,
2937         },
2938 #endif
2939 #ifdef CONFIG_NUMA
2940         {
2941                 .procname       = "zone_reclaim_mode",
2942                 .data           = &node_reclaim_mode,
2943                 .maxlen         = sizeof(node_reclaim_mode),
2944                 .mode           = 0644,
2945                 .proc_handler   = proc_dointvec,
2946                 .extra1         = SYSCTL_ZERO,
2947         },
2948         {
2949                 .procname       = "min_unmapped_ratio",
2950                 .data           = &sysctl_min_unmapped_ratio,
2951                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
2952                 .mode           = 0644,
2953                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
2954                 .extra1         = SYSCTL_ZERO,
2955                 .extra2         = &one_hundred,
2956         },
2957         {
2958                 .procname       = "min_slab_ratio",
2959                 .data           = &sysctl_min_slab_ratio,
2960                 .maxlen         = sizeof(sysctl_min_slab_ratio),
2961                 .mode           = 0644,
2962                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
2963                 .extra1         = SYSCTL_ZERO,
2964                 .extra2         = &one_hundred,
2965         },
2966 #endif
2967 #ifdef CONFIG_SMP
2968         {
2969                 .procname       = "stat_interval",
2970                 .data           = &sysctl_stat_interval,
2971                 .maxlen         = sizeof(sysctl_stat_interval),
2972                 .mode           = 0644,
2973                 .proc_handler   = proc_dointvec_jiffies,
2974         },
2975         {
2976                 .procname       = "stat_refresh",
2977                 .data           = NULL,
2978                 .maxlen         = 0,
2979                 .mode           = 0600,
2980                 .proc_handler   = vmstat_refresh,
2981         },
2982 #endif
2983 #ifdef CONFIG_MMU
2984         {
2985                 .procname       = "mmap_min_addr",
2986                 .data           = &dac_mmap_min_addr,
2987                 .maxlen         = sizeof(unsigned long),
2988                 .mode           = 0644,
2989                 .proc_handler   = mmap_min_addr_handler,
2990         },
2991 #endif
2992 #ifdef CONFIG_NUMA
2993         {
2994                 .procname       = "numa_zonelist_order",
2995                 .data           = &numa_zonelist_order,
2996                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
2997                 .mode           = 0644,
2998                 .proc_handler   = numa_zonelist_order_handler,
2999         },
3000 #endif
3001 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
3002    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
3003         {
3004                 .procname       = "vdso_enabled",
3005 #ifdef CONFIG_X86_32
3006                 .data           = &vdso32_enabled,
3007                 .maxlen         = sizeof(vdso32_enabled),
3008 #else
3009                 .data           = &vdso_enabled,
3010                 .maxlen         = sizeof(vdso_enabled),
3011 #endif
3012                 .mode           = 0644,
3013                 .proc_handler   = proc_dointvec,
3014                 .extra1         = SYSCTL_ZERO,
3015         },
3016 #endif
3017 #ifdef CONFIG_HIGHMEM
3018         {
3019                 .procname       = "highmem_is_dirtyable",
3020                 .data           = &vm_highmem_is_dirtyable,
3021                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
3022                 .mode           = 0644,
3023                 .proc_handler   = proc_dointvec_minmax,
3024                 .extra1         = SYSCTL_ZERO,
3025                 .extra2         = SYSCTL_ONE,
3026         },
3027 #endif
3028 #ifdef CONFIG_MEMORY_FAILURE
3029         {
3030                 .procname       = "memory_failure_early_kill",
3031                 .data           = &sysctl_memory_failure_early_kill,
3032                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
3033                 .mode           = 0644,
3034                 .proc_handler   = proc_dointvec_minmax,
3035                 .extra1         = SYSCTL_ZERO,
3036                 .extra2         = SYSCTL_ONE,
3037         },
3038         {
3039                 .procname       = "memory_failure_recovery",
3040                 .data           = &sysctl_memory_failure_recovery,
3041                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
3042                 .mode           = 0644,
3043                 .proc_handler   = proc_dointvec_minmax,
3044                 .extra1         = SYSCTL_ZERO,
3045                 .extra2         = SYSCTL_ONE,
3046         },
3047 #endif
3048         {
3049                 .procname       = "user_reserve_kbytes",
3050                 .data           = &sysctl_user_reserve_kbytes,
3051                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
3052                 .mode           = 0644,
3053                 .proc_handler   = proc_doulongvec_minmax,
3054         },
3055         {
3056                 .procname       = "admin_reserve_kbytes",
3057                 .data           = &sysctl_admin_reserve_kbytes,
3058                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
3059                 .mode           = 0644,
3060                 .proc_handler   = proc_doulongvec_minmax,
3061         },
3062 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3063         {
3064                 .procname       = "mmap_rnd_bits",
3065                 .data           = &mmap_rnd_bits,
3066                 .maxlen         = sizeof(mmap_rnd_bits),
3067                 .mode           = 0600,
3068                 .proc_handler   = proc_dointvec_minmax,
3069                 .extra1         = (void *)&mmap_rnd_bits_min,
3070                 .extra2         = (void *)&mmap_rnd_bits_max,
3071         },
3072 #endif
3073 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3074         {
3075                 .procname       = "mmap_rnd_compat_bits",
3076                 .data           = &mmap_rnd_compat_bits,
3077                 .maxlen         = sizeof(mmap_rnd_compat_bits),
3078                 .mode           = 0600,
3079                 .proc_handler   = proc_dointvec_minmax,
3080                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
3081                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
3082         },
3083 #endif
3084 #ifdef CONFIG_USERFAULTFD
3085         {
3086                 .procname       = "unprivileged_userfaultfd",
3087                 .data           = &sysctl_unprivileged_userfaultfd,
3088                 .maxlen         = sizeof(sysctl_unprivileged_userfaultfd),
3089                 .mode           = 0644,
3090                 .proc_handler   = proc_dointvec_minmax,
3091                 .extra1         = SYSCTL_ZERO,
3092                 .extra2         = SYSCTL_ONE,
3093         },
3094 #endif
3095         { }
3096 };
3097
3098 static struct ctl_table fs_table[] = {
3099         {
3100                 .procname       = "inode-nr",
3101                 .data           = &inodes_stat,
3102                 .maxlen         = 2*sizeof(long),
3103                 .mode           = 0444,
3104                 .proc_handler   = proc_nr_inodes,
3105         },
3106         {
3107                 .procname       = "inode-state",
3108                 .data           = &inodes_stat,
3109                 .maxlen         = 7*sizeof(long),
3110                 .mode           = 0444,
3111                 .proc_handler   = proc_nr_inodes,
3112         },
3113         {
3114                 .procname       = "file-nr",
3115                 .data           = &files_stat,
3116                 .maxlen         = sizeof(files_stat),
3117                 .mode           = 0444,
3118                 .proc_handler   = proc_nr_files,
3119         },
3120         {
3121                 .procname       = "file-max",
3122                 .data           = &files_stat.max_files,
3123                 .maxlen         = sizeof(files_stat.max_files),
3124                 .mode           = 0644,
3125                 .proc_handler   = proc_doulongvec_minmax,
3126                 .extra1         = &zero_ul,
3127                 .extra2         = &long_max,
3128         },
3129         {
3130                 .procname       = "nr_open",
3131                 .data           = &sysctl_nr_open,
3132                 .maxlen         = sizeof(unsigned int),
3133                 .mode           = 0644,
3134                 .proc_handler   = proc_dointvec_minmax,
3135                 .extra1         = &sysctl_nr_open_min,
3136                 .extra2         = &sysctl_nr_open_max,
3137         },
3138         {
3139                 .procname       = "dentry-state",
3140                 .data           = &dentry_stat,
3141                 .maxlen         = 6*sizeof(long),
3142                 .mode           = 0444,
3143                 .proc_handler   = proc_nr_dentry,
3144         },
3145         {
3146                 .procname       = "overflowuid",
3147                 .data           = &fs_overflowuid,
3148                 .maxlen         = sizeof(int),
3149                 .mode           = 0644,
3150                 .proc_handler   = proc_dointvec_minmax,
3151                 .extra1         = &minolduid,
3152                 .extra2         = &maxolduid,
3153         },
3154         {
3155                 .procname       = "overflowgid",
3156                 .data           = &fs_overflowgid,
3157                 .maxlen         = sizeof(int),
3158                 .mode           = 0644,
3159                 .proc_handler   = proc_dointvec_minmax,
3160                 .extra1         = &minolduid,
3161                 .extra2         = &maxolduid,
3162         },
3163 #ifdef CONFIG_FILE_LOCKING
3164         {
3165                 .procname       = "leases-enable",
3166                 .data           = &leases_enable,
3167                 .maxlen         = sizeof(int),
3168                 .mode           = 0644,
3169                 .proc_handler   = proc_dointvec,
3170         },
3171 #endif
3172 #ifdef CONFIG_DNOTIFY
3173         {
3174                 .procname       = "dir-notify-enable",
3175                 .data           = &dir_notify_enable,
3176                 .maxlen         = sizeof(int),
3177                 .mode           = 0644,
3178                 .proc_handler   = proc_dointvec,
3179         },
3180 #endif
3181 #ifdef CONFIG_MMU
3182 #ifdef CONFIG_FILE_LOCKING
3183         {
3184                 .procname       = "lease-break-time",
3185                 .data           = &lease_break_time,
3186                 .maxlen         = sizeof(int),
3187                 .mode           = 0644,
3188                 .proc_handler   = proc_dointvec,
3189         },
3190 #endif
3191 #ifdef CONFIG_AIO
3192         {
3193                 .procname       = "aio-nr",
3194                 .data           = &aio_nr,
3195                 .maxlen         = sizeof(aio_nr),
3196                 .mode           = 0444,
3197                 .proc_handler   = proc_doulongvec_minmax,
3198         },
3199         {
3200                 .procname       = "aio-max-nr",
3201                 .data           = &aio_max_nr,
3202                 .maxlen         = sizeof(aio_max_nr),
3203                 .mode           = 0644,
3204                 .proc_handler   = proc_doulongvec_minmax,
3205         },
3206 #endif /* CONFIG_AIO */
3207 #ifdef CONFIG_INOTIFY_USER
3208         {
3209                 .procname       = "inotify",
3210                 .mode           = 0555,
3211                 .child          = inotify_table,
3212         },
3213 #endif
3214 #ifdef CONFIG_EPOLL
3215         {
3216                 .procname       = "epoll",
3217                 .mode           = 0555,
3218                 .child          = epoll_table,
3219         },
3220 #endif
3221 #endif
3222         {
3223                 .procname       = "protected_symlinks",
3224                 .data           = &sysctl_protected_symlinks,
3225                 .maxlen         = sizeof(int),
3226                 .mode           = 0600,
3227                 .proc_handler   = proc_dointvec_minmax,
3228                 .extra1         = SYSCTL_ZERO,
3229                 .extra2         = SYSCTL_ONE,
3230         },
3231         {
3232                 .procname       = "protected_hardlinks",
3233                 .data           = &sysctl_protected_hardlinks,
3234                 .maxlen         = sizeof(int),
3235                 .mode           = 0600,
3236                 .proc_handler   = proc_dointvec_minmax,
3237                 .extra1         = SYSCTL_ZERO,
3238                 .extra2         = SYSCTL_ONE,
3239         },
3240         {
3241                 .procname       = "protected_fifos",
3242                 .data           = &sysctl_protected_fifos,
3243                 .maxlen         = sizeof(int),
3244                 .mode           = 0600,
3245                 .proc_handler   = proc_dointvec_minmax,
3246                 .extra1         = SYSCTL_ZERO,
3247                 .extra2         = &two,
3248         },
3249         {
3250                 .procname       = "protected_regular",
3251                 .data           = &sysctl_protected_regular,
3252                 .maxlen         = sizeof(int),
3253                 .mode           = 0600,
3254                 .proc_handler   = proc_dointvec_minmax,
3255                 .extra1         = SYSCTL_ZERO,
3256                 .extra2         = &two,
3257         },
3258         {
3259                 .procname       = "suid_dumpable",
3260                 .data           = &suid_dumpable,
3261                 .maxlen         = sizeof(int),
3262                 .mode           = 0644,
3263                 .proc_handler   = proc_dointvec_minmax_coredump,
3264                 .extra1         = SYSCTL_ZERO,
3265                 .extra2         = &two,
3266         },
3267 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3268         {
3269                 .procname       = "binfmt_misc",
3270                 .mode           = 0555,
3271                 .child          = sysctl_mount_point,
3272         },
3273 #endif
3274         {
3275                 .procname       = "pipe-max-size",
3276                 .data           = &pipe_max_size,
3277                 .maxlen         = sizeof(pipe_max_size),
3278                 .mode           = 0644,
3279                 .proc_handler   = proc_dopipe_max_size,
3280         },
3281         {
3282                 .procname       = "pipe-user-pages-hard",
3283                 .data           = &pipe_user_pages_hard,
3284                 .maxlen         = sizeof(pipe_user_pages_hard),
3285                 .mode           = 0644,
3286                 .proc_handler   = proc_doulongvec_minmax,
3287         },
3288         {
3289                 .procname       = "pipe-user-pages-soft",
3290                 .data           = &pipe_user_pages_soft,
3291                 .maxlen         = sizeof(pipe_user_pages_soft),
3292                 .mode           = 0644,
3293                 .proc_handler   = proc_doulongvec_minmax,
3294         },
3295         {
3296                 .procname       = "mount-max",
3297                 .data           = &sysctl_mount_max,
3298                 .maxlen         = sizeof(unsigned int),
3299                 .mode           = 0644,
3300                 .proc_handler   = proc_dointvec_minmax,
3301                 .extra1         = SYSCTL_ONE,
3302         },
3303         { }
3304 };
3305
3306 static struct ctl_table debug_table[] = {
3307 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3308         {
3309                 .procname       = "exception-trace",
3310                 .data           = &show_unhandled_signals,
3311                 .maxlen         = sizeof(int),
3312                 .mode           = 0644,
3313                 .proc_handler   = proc_dointvec
3314         },
3315 #endif
3316 #if defined(CONFIG_OPTPROBES)
3317         {
3318                 .procname       = "kprobes-optimization",
3319                 .data           = &sysctl_kprobes_optimization,
3320                 .maxlen         = sizeof(int),
3321                 .mode           = 0644,
3322                 .proc_handler   = proc_kprobes_optimization_handler,
3323                 .extra1         = SYSCTL_ZERO,
3324                 .extra2         = SYSCTL_ONE,
3325         },
3326 #endif
3327         { }
3328 };
3329
3330 static struct ctl_table dev_table[] = {
3331         { }
3332 };
3333
3334 static struct ctl_table sysctl_base_table[] = {
3335         {
3336                 .procname       = "kernel",
3337                 .mode           = 0555,
3338                 .child          = kern_table,
3339         },
3340         {
3341                 .procname       = "vm",
3342                 .mode           = 0555,
3343                 .child          = vm_table,
3344         },
3345         {
3346                 .procname       = "fs",
3347                 .mode           = 0555,
3348                 .child          = fs_table,
3349         },
3350         {
3351                 .procname       = "debug",
3352                 .mode           = 0555,
3353                 .child          = debug_table,
3354         },
3355         {
3356                 .procname       = "dev",
3357                 .mode           = 0555,
3358                 .child          = dev_table,
3359         },
3360         { }
3361 };
3362
3363 int __init sysctl_init(void)
3364 {
3365         struct ctl_table_header *hdr;
3366
3367         hdr = register_sysctl_table(sysctl_base_table);
3368         kmemleak_not_leak(hdr);
3369         return 0;
3370 }
3371 #endif /* CONFIG_SYSCTL */
3372 /*
3373  * No sense putting this after each symbol definition, twice,
3374  * exception granted :-)
3375  */
3376 EXPORT_SYMBOL(proc_dointvec);
3377 EXPORT_SYMBOL(proc_douintvec);
3378 EXPORT_SYMBOL(proc_dointvec_jiffies);
3379 EXPORT_SYMBOL(proc_dointvec_minmax);
3380 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3381 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3382 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3383 EXPORT_SYMBOL(proc_dostring);
3384 EXPORT_SYMBOL(proc_doulongvec_minmax);
3385 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3386 EXPORT_SYMBOL(proc_do_large_bitmap);