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 *buffer, size_t *lenp, loff_t *ppos)
 208 {
 209         struct static_key *key = (struct static_key *)table->data;
 210         static int saved_val;
 211         int val, ret;
 212         struct ctl_table tmp = {
 213                 .data   = &val,
 214                 .maxlen = sizeof(val),
 215                 .mode   = table->mode,
 216                 .extra1 = SYSCTL_ZERO,
 217                 .extra2 = SYSCTL_ONE,
 218         };
 219
 220         if (write && !capable(CAP_SYS_ADMIN))
 221                 return -EPERM;
 222
 223         mutex_lock(&bpf_stats_enabled_mutex);
 224         val = saved_val;
 225         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 226         if (write && !ret && val != saved_val) {
 227                 if (val)
 228                         static_key_slow_inc(key);
 229                 else
 230                         static_key_slow_dec(key);
 231                 saved_val = val;
 232         }
 233         mutex_unlock(&bpf_stats_enabled_mutex);
 234         return ret;
 235 }
 236 #endif
 237
 238 /*
 239  * /proc/sys support
 240  */
 241
 242 #ifdef CONFIG_PROC_SYSCTL
 243
 244 static int _proc_do_string(char *data, int maxlen, int write,
 245                 char *buffer, size_t *lenp, loff_t *ppos)
 246 {
 247         size_t len;
 248         char c, *p;
 249
 250         if (!data || !maxlen || !*lenp) {
 251                 *lenp = 0;
 252                 return 0;
 253         }
 254
 255         if (write) {
 256                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
 257                         /* Only continue writes not past the end of buffer. */
 258                         len = strlen(data);
 259                         if (len > maxlen - 1)
 260                                 len = maxlen - 1;
 261
 262                         if (*ppos > len)
 263                                 return 0;
 264                         len = *ppos;
 265                 } else {
 266                         /* Start writing from beginning of buffer. */
 267                         len = 0;
 268                 }
 269
 270                 *ppos += *lenp;
 271                 p = buffer;
 272                 while ((p - buffer) < *lenp && len < maxlen - 1) {
 273                         c = *(p++);
 274                         if (c == 0 || c == '\n')
 275                                 break;
 276                         data[len++] = c;
 277                 }
 278                 data[len] = 0;
 279         } else {
 280                 len = strlen(data);
 281                 if (len > maxlen)
 282                         len = maxlen;
 283
 284                 if (*ppos > len) {
 285                         *lenp = 0;
 286                         return 0;
 287                 }
 288
 289                 data += *ppos;
 290                 len  -= *ppos;
 291
 292                 if (len > *lenp)
 293                         len = *lenp;
 294                 if (len)
 295                         memcpy(buffer, data, len);
 296                 if (len < *lenp) {
 297                         buffer[len] = '\n';
 298                         len++;
 299                 }
 300                 *lenp = len;
 301                 *ppos += len;
 302         }
 303         return 0;
 304 }
 305
 306 static void warn_sysctl_write(struct ctl_table *table)
 307 {
 308         pr_warn_once("%s wrote to %s when file position was not 0!\n"
 309                 "This will not be supported in the future. To silence this\n"
 310                 "warning, set kernel.sysctl_writes_strict = -1\n",
 311                 current->comm, table->procname);
 312 }
 313
 314 /**
 315  * proc_first_pos_non_zero_ignore - check if first position is allowed
 316  * @ppos: file position
 317  * @table: the sysctl table
 318  *
 319  * Returns true if the first position is non-zero and the sysctl_writes_strict
 320  * mode indicates this is not allowed for numeric input types. String proc
 321  * handlers can ignore the return value.
 322  */
 323 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
 324                                            struct ctl_table *table)
 325 {
 326         if (!*ppos)
 327                 return false;
 328
 329         switch (sysctl_writes_strict) {
 330         case SYSCTL_WRITES_STRICT:
 331                 return true;
 332         case SYSCTL_WRITES_WARN:
 333                 warn_sysctl_write(table);
 334                 return false;
 335         default:
 336                 return false;
 337         }
 338 }
 339
 340 /**
 341  * proc_dostring - read a string sysctl
 342  * @table: the sysctl table
 343  * @write: %TRUE if this is a write to the sysctl file
 344  * @buffer: the user buffer
 345  * @lenp: the size of the user buffer
 346  * @ppos: file position
 347  *
 348  * Reads/writes a string from/to the user buffer. If the kernel
 349  * buffer provided is not large enough to hold the string, the
 350  * string is truncated. The copied string is %NULL-terminated.
 351  * If the string is being read by the user process, it is copied
 352  * and a newline '\n' is added. It is truncated if the buffer is
 353  * not large enough.
 354  *
 355  * Returns 0 on success.
 356  */
 357 int proc_dostring(struct ctl_table *table, int write,
 358                   void *buffer, size_t *lenp, loff_t *ppos)
 359 {
 360         if (write)
 361                 proc_first_pos_non_zero_ignore(ppos, table);
 362
 363         return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
 364                         ppos);
 365 }
 366
 367 static size_t proc_skip_spaces(char **buf)
 368 {
 369         size_t ret;
 370         char *tmp = skip_spaces(*buf);
 371         ret = tmp - *buf;
 372         *buf = tmp;
 373         return ret;
 374 }
 375
 376 static void proc_skip_char(char **buf, size_t *size, const char v)
 377 {
 378         while (*size) {
 379                 if (**buf != v)
 380                         break;
 381                 (*size)--;
 382                 (*buf)++;
 383         }
 384 }
 385
 386 /**
 387  * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
 388  *                   fail on overflow
 389  *
 390  * @cp: kernel buffer containing the string to parse
 391  * @endp: pointer to store the trailing characters
 392  * @base: the base to use
 393  * @res: where the parsed integer will be stored
 394  *
 395  * In case of success 0 is returned and @res will contain the parsed integer,
 396  * @endp will hold any trailing characters.
 397  * This function will fail the parse on overflow. If there wasn't an overflow
 398  * the function will defer the decision what characters count as invalid to the
 399  * caller.
 400  */
 401 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
 402                            unsigned long *res)
 403 {
 404         unsigned long long result;
 405         unsigned int rv;
 406
 407         cp = _parse_integer_fixup_radix(cp, &base);
 408         rv = _parse_integer(cp, base, &result);
 409         if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
 410                 return -ERANGE;
 411
 412         cp += rv;
 413
 414         if (endp)
 415                 *endp = (char *)cp;
 416
 417         *res = (unsigned long)result;
 418         return 0;
 419 }
 420
 421 #define TMPBUFLEN 22
 422 /**
 423  * proc_get_long - reads an ASCII formatted integer from a user buffer
 424  *
 425  * @buf: a kernel buffer
 426  * @size: size of the kernel buffer
 427  * @val: this is where the number will be stored
 428  * @neg: set to %TRUE if number is negative
 429  * @perm_tr: a vector which contains the allowed trailers
 430  * @perm_tr_len: size of the perm_tr vector
 431  * @tr: pointer to store the trailer character
 432  *
 433  * In case of success %0 is returned and @buf and @size are updated with
 434  * the amount of bytes read. If @tr is non-NULL and a trailing
 435  * character exists (size is non-zero after returning from this
 436  * function), @tr is updated with the trailing character.
 437  */
 438 static int proc_get_long(char **buf, size_t *size,
 439                           unsigned long *val, bool *neg,
 440                           const char *perm_tr, unsigned perm_tr_len, char *tr)
 441 {
 442         int len;
 443         char *p, tmp[TMPBUFLEN];
 444
 445         if (!*size)
 446                 return -EINVAL;
 447
 448         len = *size;
 449         if (len > TMPBUFLEN - 1)
 450                 len = TMPBUFLEN - 1;
 451
 452         memcpy(tmp, *buf, len);
 453
 454         tmp[len] = 0;
 455         p = tmp;
 456         if (*p == '-' && *size > 1) {
 457                 *neg = true;
 458                 p++;
 459         } else
 460                 *neg = false;
 461         if (!isdigit(*p))
 462                 return -EINVAL;
 463
 464         if (strtoul_lenient(p, &p, 0, val))
 465                 return -EINVAL;
 466
 467         len = p - tmp;
 468
 469         /* We don't know if the next char is whitespace thus we may accept
 470          * invalid integers (e.g. 1234...a) or two integers instead of one
 471          * (e.g. 123...1). So lets not allow such large numbers. */
 472         if (len == TMPBUFLEN - 1)
 473                 return -EINVAL;
 474
 475         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
 476                 return -EINVAL;
 477
 478         if (tr && (len < *size))
 479                 *tr = *p;
 480
 481         *buf += len;
 482         *size -= len;
 483
 484         return 0;
 485 }
 486
 487 /**
 488  * proc_put_long - converts an integer to a decimal ASCII formatted string
 489  *
 490  * @buf: the user buffer
 491  * @size: the size of the user buffer
 492  * @val: the integer to be converted
 493  * @neg: sign of the number, %TRUE for negative
 494  *
 495  * In case of success @buf and @size are updated with the amount of bytes
 496  * written.
 497  */
 498 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
 499 {
 500         int len;
 501         char tmp[TMPBUFLEN], *p = tmp;
 502
 503         sprintf(p, "%s%lu", neg ? "-" : "", val);
 504         len = strlen(tmp);
 505         if (len > *size)
 506                 len = *size;
 507         memcpy(*buf, tmp, len);
 508         *size -= len;
 509         *buf += len;
 510 }
 511 #undef TMPBUFLEN
 512
 513 static void proc_put_char(void **buf, size_t *size, char c)
 514 {
 515         if (*size) {
 516                 char **buffer = (char **)buf;
 517                 **buffer = c;
 518
 519                 (*size)--;
 520                 (*buffer)++;
 521                 *buf = *buffer;
 522         }
 523 }
 524
 525 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
 526                                  int *valp,
 527                                  int write, void *data)
 528 {
 529         if (write) {
 530                 if (*negp) {
 531                         if (*lvalp > (unsigned long) INT_MAX + 1)
 532                                 return -EINVAL;
 533                         *valp = -*lvalp;
 534                 } else {
 535                         if (*lvalp > (unsigned long) INT_MAX)
 536                                 return -EINVAL;
 537                         *valp = *lvalp;
 538                 }
 539         } else {
 540                 int val = *valp;
 541                 if (val < 0) {
 542                         *negp = true;
 543                         *lvalp = -(unsigned long)val;
 544                 } else {
 545                         *negp = false;
 546                         *lvalp = (unsigned long)val;
 547                 }
 548         }
 549         return 0;
 550 }
 551
 552 static int do_proc_douintvec_conv(unsigned long *lvalp,
 553                                   unsigned int *valp,
 554                                   int write, void *data)
 555 {
 556         if (write) {
 557                 if (*lvalp > UINT_MAX)
 558                         return -EINVAL;
 559                 *valp = *lvalp;
 560         } else {
 561                 unsigned int val = *valp;
 562                 *lvalp = (unsigned long)val;
 563         }
 564         return 0;
 565 }
 566
 567 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
 568
 569 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
 570                   int write, void *buffer,
 571                   size_t *lenp, loff_t *ppos,
 572                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 573                               int write, void *data),
 574                   void *data)
 575 {
 576         int *i, vleft, first = 1, err = 0;
 577         size_t left;
 578         char *p;
 579
 580         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 581                 *lenp = 0;
 582                 return 0;
 583         }
 584
 585         i = (int *) tbl_data;
 586         vleft = table->maxlen / sizeof(*i);
 587         left = *lenp;
 588
 589         if (!conv)
 590                 conv = do_proc_dointvec_conv;
 591
 592         if (write) {
 593                 if (proc_first_pos_non_zero_ignore(ppos, table))
 594                         goto out;
 595
 596                 if (left > PAGE_SIZE - 1)
 597                         left = PAGE_SIZE - 1;
 598                 p = buffer;
 599         }
 600
 601         for (; left && vleft--; i++, first=0) {
 602                 unsigned long lval;
 603                 bool neg;
 604
 605                 if (write) {
 606                         left -= proc_skip_spaces(&p);
 607
 608                         if (!left)
 609                                 break;
 610                         err = proc_get_long(&p, &left, &lval, &neg,
 611                                              proc_wspace_sep,
 612                                              sizeof(proc_wspace_sep), NULL);
 613                         if (err)
 614                                 break;
 615                         if (conv(&neg, &lval, i, 1, data)) {
 616                                 err = -EINVAL;
 617                                 break;
 618                         }
 619                 } else {
 620                         if (conv(&neg, &lval, i, 0, data)) {
 621                                 err = -EINVAL;
 622                                 break;
 623                         }
 624                         if (!first)
 625                                 proc_put_char(&buffer, &left, '\t');
 626                         proc_put_long(&buffer, &left, lval, neg);
 627                 }
 628         }
 629
 630         if (!write && !first && left && !err)
 631                 proc_put_char(&buffer, &left, '\n');
 632         if (write && !err && left)
 633                 left -= proc_skip_spaces(&p);
 634         if (write && first)
 635                 return err ? : -EINVAL;
 636         *lenp -= left;
 637 out:
 638         *ppos += *lenp;
 639         return err;
 640 }
 641
 642 static int do_proc_dointvec(struct ctl_table *table, int write,
 643                   void *buffer, size_t *lenp, loff_t *ppos,
 644                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 645                               int write, void *data),
 646                   void *data)
 647 {
 648         return __do_proc_dointvec(table->data, table, write,
 649                         buffer, lenp, ppos, conv, data);
 650 }
 651
 652 static int do_proc_douintvec_w(unsigned int *tbl_data,
 653                                struct ctl_table *table,
 654                                void *buffer,
 655                                size_t *lenp, loff_t *ppos,
 656                                int (*conv)(unsigned long *lvalp,
 657                                            unsigned int *valp,
 658                                            int write, void *data),
 659                                void *data)
 660 {
 661         unsigned long lval;
 662         int err = 0;
 663         size_t left;
 664         bool neg;
 665         char *p = buffer;
 666
 667         left = *lenp;
 668
 669         if (proc_first_pos_non_zero_ignore(ppos, table))
 670                 goto bail_early;
 671
 672         if (left > PAGE_SIZE - 1)
 673                 left = PAGE_SIZE - 1;
 674
 675         left -= proc_skip_spaces(&p);
 676         if (!left) {
 677                 err = -EINVAL;
 678                 goto out_free;
 679         }
 680
 681         err = proc_get_long(&p, &left, &lval, &neg,
 682                              proc_wspace_sep,
 683                              sizeof(proc_wspace_sep), NULL);
 684         if (err || neg) {
 685                 err = -EINVAL;
 686                 goto out_free;
 687         }
 688
 689         if (conv(&lval, tbl_data, 1, data)) {
 690                 err = -EINVAL;
 691                 goto out_free;
 692         }
 693
 694         if (!err && left)
 695                 left -= proc_skip_spaces(&p);
 696
 697 out_free:
 698         if (err)
 699                 return -EINVAL;
 700
 701         return 0;
 702
 703         /* This is in keeping with old __do_proc_dointvec() */
 704 bail_early:
 705         *ppos += *lenp;
 706         return err;
 707 }
 708
 709 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
 710                                size_t *lenp, loff_t *ppos,
 711                                int (*conv)(unsigned long *lvalp,
 712                                            unsigned int *valp,
 713                                            int write, void *data),
 714                                void *data)
 715 {
 716         unsigned long lval;
 717         int err = 0;
 718         size_t left;
 719
 720         left = *lenp;
 721
 722         if (conv(&lval, tbl_data, 0, data)) {
 723                 err = -EINVAL;
 724                 goto out;
 725         }
 726
 727         proc_put_long(&buffer, &left, lval, false);
 728         if (!left)
 729                 goto out;
 730
 731         proc_put_char(&buffer, &left, '\n');
 732
 733 out:
 734         *lenp -= left;
 735         *ppos += *lenp;
 736
 737         return err;
 738 }
 739
 740 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
 741                                int write, void *buffer,
 742                                size_t *lenp, loff_t *ppos,
 743                                int (*conv)(unsigned long *lvalp,
 744                                            unsigned int *valp,
 745                                            int write, void *data),
 746                                void *data)
 747 {
 748         unsigned int *i, vleft;
 749
 750         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 751                 *lenp = 0;
 752                 return 0;
 753         }
 754
 755         i = (unsigned int *) tbl_data;
 756         vleft = table->maxlen / sizeof(*i);
 757
 758         /*
 759          * Arrays are not supported, keep this simple. *Do not* add
 760          * support for them.
 761          */
 762         if (vleft != 1) {
 763                 *lenp = 0;
 764                 return -EINVAL;
 765         }
 766
 767         if (!conv)
 768                 conv = do_proc_douintvec_conv;
 769
 770         if (write)
 771                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
 772                                            conv, data);
 773         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
 774 }
 775
 776 static int do_proc_douintvec(struct ctl_table *table, int write,
 777                              void *buffer, size_t *lenp, loff_t *ppos,
 778                              int (*conv)(unsigned long *lvalp,
 779                                          unsigned int *valp,
 780                                          int write, void *data),
 781                              void *data)
 782 {
 783         return __do_proc_douintvec(table->data, table, write,
 784                                    buffer, lenp, ppos, conv, data);
 785 }
 786
 787 /**
 788  * proc_dointvec - read a vector of integers
 789  * @table: the sysctl table
 790  * @write: %TRUE if this is a write to the sysctl file
 791  * @buffer: the user buffer
 792  * @lenp: the size of the user buffer
 793  * @ppos: file position
 794  *
 795  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 796  * values from/to the user buffer, treated as an ASCII string.
 797  *
 798  * Returns 0 on success.
 799  */
 800 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
 801                   size_t *lenp, loff_t *ppos)
 802 {
 803         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
 804 }
 805
 806 #ifdef CONFIG_COMPACTION
 807 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
 808                 int write, void *buffer, size_t *lenp, loff_t *ppos)
 809 {
 810         int ret, old;
 811
 812         if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
 813                 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 814
 815         old = *(int *)table->data;
 816         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 817         if (ret)
 818                 return ret;
 819         if (old != *(int *)table->data)
 820                 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
 821                              table->procname, current->comm,
 822                              task_pid_nr(current));
 823         return ret;
 824 }
 825 #endif
 826
 827 /**
 828  * proc_douintvec - read a vector of unsigned integers
 829  * @table: the sysctl table
 830  * @write: %TRUE if this is a write to the sysctl file
 831  * @buffer: the user buffer
 832  * @lenp: the size of the user buffer
 833  * @ppos: file position
 834  *
 835  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
 836  * values from/to the user buffer, treated as an ASCII string.
 837  *
 838  * Returns 0 on success.
 839  */
 840 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
 841                 size_t *lenp, loff_t *ppos)
 842 {
 843         return do_proc_douintvec(table, write, buffer, lenp, ppos,
 844                                  do_proc_douintvec_conv, NULL);
 845 }
 846
 847 /*
 848  * Taint values can only be increased
 849  * This means we can safely use a temporary.
 850  */
 851 static int proc_taint(struct ctl_table *table, int write,
 852                                void *buffer, size_t *lenp, loff_t *ppos)
 853 {
 854         struct ctl_table t;
 855         unsigned long tmptaint = get_taint();
 856         int err;
 857
 858         if (write && !capable(CAP_SYS_ADMIN))
 859                 return -EPERM;
 860
 861         t = *table;
 862         t.data = &tmptaint;
 863         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
 864         if (err < 0)
 865                 return err;
 866
 867         if (write) {
 868                 int i;
 869
 870                 /*
 871                  * If we are relying on panic_on_taint not producing
 872                  * false positives due to userspace input, bail out
 873                  * before setting the requested taint flags.
 874                  */
 875                 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
 876                         return -EINVAL;
 877
 878                 /*
 879                  * Poor man's atomic or. Not worth adding a primitive
 880                  * to everyone's atomic.h for this
 881                  */
 882                 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
 883                         if ((1UL << i) & tmptaint)
 884                                 add_taint(i, LOCKDEP_STILL_OK);
 885         }
 886
 887         return err;
 888 }
 889
 890 #ifdef CONFIG_PRINTK
 891 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 892                                 void *buffer, size_t *lenp, loff_t *ppos)
 893 {
 894         if (write && !capable(CAP_SYS_ADMIN))
 895                 return -EPERM;
 896
 897         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 898 }
 899 #endif
 900
 901 /**
 902  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
 903  * @min: pointer to minimum allowable value
 904  * @max: pointer to maximum allowable value
 905  *
 906  * The do_proc_dointvec_minmax_conv_param structure provides the
 907  * minimum and maximum values for doing range checking for those sysctl
 908  * parameters that use the proc_dointvec_minmax() handler.
 909  */
 910 struct do_proc_dointvec_minmax_conv_param {
 911         int *min;
 912         int *max;
 913 };
 914
 915 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
 916                                         int *valp,
 917                                         int write, void *data)
 918 {
 919         int tmp, ret;
 920         struct do_proc_dointvec_minmax_conv_param *param = data;
 921         /*
 922          * If writing, first do so via a temporary local int so we can
 923          * bounds-check it before touching *valp.
 924          */
 925         int *ip = write ? &tmp : valp;
 926
 927         ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
 928         if (ret)
 929                 return ret;
 930
 931         if (write) {
 932                 if ((param->min && *param->min > tmp) ||
 933                     (param->max && *param->max < tmp))
 934                         return -EINVAL;
 935                 *valp = tmp;
 936         }
 937
 938         return 0;
 939 }
 940
 941 /**
 942  * proc_dointvec_minmax - read a vector of integers with min/max values
 943  * @table: the sysctl table
 944  * @write: %TRUE if this is a write to the sysctl file
 945  * @buffer: the user buffer
 946  * @lenp: the size of the user buffer
 947  * @ppos: file position
 948  *
 949  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 950  * values from/to the user buffer, treated as an ASCII string.
 951  *
 952  * This routine will ensure the values are within the range specified by
 953  * table->extra1 (min) and table->extra2 (max).
 954  *
 955  * Returns 0 on success or -EINVAL on write when the range check fails.
 956  */
 957 int proc_dointvec_minmax(struct ctl_table *table, int write,
 958                   void *buffer, size_t *lenp, loff_t *ppos)
 959 {
 960         struct do_proc_dointvec_minmax_conv_param param = {
 961                 .min = (int *) table->extra1,
 962                 .max = (int *) table->extra2,
 963         };
 964         return do_proc_dointvec(table, write, buffer, lenp, ppos,
 965                                 do_proc_dointvec_minmax_conv, &param);
 966 }
 967
 968 /**
 969  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
 970  * @min: pointer to minimum allowable value
 971  * @max: pointer to maximum allowable value
 972  *
 973  * The do_proc_douintvec_minmax_conv_param structure provides the
 974  * minimum and maximum values for doing range checking for those sysctl
 975  * parameters that use the proc_douintvec_minmax() handler.
 976  */
 977 struct do_proc_douintvec_minmax_conv_param {
 978         unsigned int *min;
 979         unsigned int *max;
 980 };
 981
 982 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
 983                                          unsigned int *valp,
 984                                          int write, void *data)
 985 {
 986         int ret;
 987         unsigned int tmp;
 988         struct do_proc_douintvec_minmax_conv_param *param = data;
 989         /* write via temporary local uint for bounds-checking */
 990         unsigned int *up = write ? &tmp : valp;
 991
 992         ret = do_proc_douintvec_conv(lvalp, up, write, data);
 993         if (ret)
 994                 return ret;
 995
 996         if (write) {
 997                 if ((param->min && *param->min > tmp) ||
 998                     (param->max && *param->max < tmp))
 999                         return -ERANGE;
1000
1001                 *valp = tmp;
1002         }
1003
1004         return 0;
1005 }
1006
1007 /**
1008  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1009  * @table: the sysctl table
1010  * @write: %TRUE if this is a write to the sysctl file
1011  * @buffer: the user buffer
1012  * @lenp: the size of the user buffer
1013  * @ppos: file position
1014  *
1015  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1016  * values from/to the user buffer, treated as an ASCII string. Negative
1017  * strings are not allowed.
1018  *
1019  * This routine will ensure the values are within the range specified by
1020  * table->extra1 (min) and table->extra2 (max). There is a final sanity
1021  * check for UINT_MAX to avoid having to support wrap around uses from
1022  * userspace.
1023  *
1024  * Returns 0 on success or -ERANGE on write when the range check fails.
1025  */
1026 int proc_douintvec_minmax(struct ctl_table *table, int write,
1027                           void *buffer, size_t *lenp, loff_t *ppos)
1028 {
1029         struct do_proc_douintvec_minmax_conv_param param = {
1030                 .min = (unsigned int *) table->extra1,
1031                 .max = (unsigned int *) table->extra2,
1032         };
1033         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1034                                  do_proc_douintvec_minmax_conv, &param);
1035 }
1036
1037 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1038                                         unsigned int *valp,
1039                                         int write, void *data)
1040 {
1041         if (write) {
1042                 unsigned int val;
1043
1044                 val = round_pipe_size(*lvalp);
1045                 if (val == 0)
1046                         return -EINVAL;
1047
1048                 *valp = val;
1049         } else {
1050                 unsigned int val = *valp;
1051                 *lvalp = (unsigned long) val;
1052         }
1053
1054         return 0;
1055 }
1056
1057 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1058                                 void *buffer, size_t *lenp, loff_t *ppos)
1059 {
1060         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1061                                  do_proc_dopipe_max_size_conv, NULL);
1062 }
1063
1064 static void validate_coredump_safety(void)
1065 {
1066 #ifdef CONFIG_COREDUMP
1067         if (suid_dumpable == SUID_DUMP_ROOT &&
1068             core_pattern[0] != '/' && core_pattern[0] != '|') {
1069                 printk(KERN_WARNING
1070 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1071 "Pipe handler or fully qualified core dump path required.\n"
1072 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1073                 );
1074         }
1075 #endif
1076 }
1077
1078 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1079                 void *buffer, size_t *lenp, loff_t *ppos)
1080 {
1081         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1082         if (!error)
1083                 validate_coredump_safety();
1084         return error;
1085 }
1086
1087 #ifdef CONFIG_COREDUMP
1088 static int proc_dostring_coredump(struct ctl_table *table, int write,
1089                   void *buffer, size_t *lenp, loff_t *ppos)
1090 {
1091         int error = proc_dostring(table, write, buffer, lenp, ppos);
1092         if (!error)
1093                 validate_coredump_safety();
1094         return error;
1095 }
1096 #endif
1097
1098 #ifdef CONFIG_MAGIC_SYSRQ
1099 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1100                                 void *buffer, size_t *lenp, loff_t *ppos)
1101 {
1102         int tmp, ret;
1103
1104         tmp = sysrq_mask();
1105
1106         ret = __do_proc_dointvec(&tmp, table, write, buffer,
1107                                lenp, ppos, NULL, NULL);
1108         if (ret || !write)
1109                 return ret;
1110
1111         if (write)
1112                 sysrq_toggle_support(tmp);
1113
1114         return 0;
1115 }
1116 #endif
1117
1118 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1119                 int write, void *buffer, size_t *lenp, loff_t *ppos,
1120                 unsigned long convmul, unsigned long convdiv)
1121 {
1122         unsigned long *i, *min, *max;
1123         int vleft, first = 1, err = 0;
1124         size_t left;
1125         char *p;
1126
1127         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1128                 *lenp = 0;
1129                 return 0;
1130         }
1131
1132         i = (unsigned long *) data;
1133         min = (unsigned long *) table->extra1;
1134         max = (unsigned long *) table->extra2;
1135         vleft = table->maxlen / sizeof(unsigned long);
1136         left = *lenp;
1137
1138         if (write) {
1139                 if (proc_first_pos_non_zero_ignore(ppos, table))
1140                         goto out;
1141
1142                 if (left > PAGE_SIZE - 1)
1143                         left = PAGE_SIZE - 1;
1144                 p = buffer;
1145         }
1146
1147         for (; left && vleft--; i++, first = 0) {
1148                 unsigned long val;
1149
1150                 if (write) {
1151                         bool neg;
1152
1153                         left -= proc_skip_spaces(&p);
1154                         if (!left)
1155                                 break;
1156
1157                         err = proc_get_long(&p, &left, &val, &neg,
1158                                              proc_wspace_sep,
1159                                              sizeof(proc_wspace_sep), NULL);
1160                         if (err)
1161                                 break;
1162                         if (neg)
1163                                 continue;
1164                         val = convmul * val / convdiv;
1165                         if ((min && val < *min) || (max && val > *max)) {
1166                                 err = -EINVAL;
1167                                 break;
1168                         }
1169                         *i = val;
1170                 } else {
1171                         val = convdiv * (*i) / convmul;
1172                         if (!first)
1173                                 proc_put_char(&buffer, &left, '\t');
1174                         proc_put_long(&buffer, &left, val, false);
1175                 }
1176         }
1177
1178         if (!write && !first && left && !err)
1179                 proc_put_char(&buffer, &left, '\n');
1180         if (write && !err)
1181                 left -= proc_skip_spaces(&p);
1182         if (write && first)
1183                 return err ? : -EINVAL;
1184         *lenp -= left;
1185 out:
1186         *ppos += *lenp;
1187         return err;
1188 }
1189
1190 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1191                 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1192                 unsigned long convdiv)
1193 {
1194         return __do_proc_doulongvec_minmax(table->data, table, write,
1195                         buffer, lenp, ppos, convmul, convdiv);
1196 }
1197
1198 /**
1199  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1200  * @table: the sysctl table
1201  * @write: %TRUE if this is a write to the sysctl file
1202  * @buffer: the user buffer
1203  * @lenp: the size of the user buffer
1204  * @ppos: file position
1205  *
1206  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1207  * values from/to the user buffer, treated as an ASCII string.
1208  *
1209  * This routine will ensure the values are within the range specified by
1210  * table->extra1 (min) and table->extra2 (max).
1211  *
1212  * Returns 0 on success.
1213  */
1214 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1215                            void *buffer, size_t *lenp, loff_t *ppos)
1216 {
1217     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1218 }
1219
1220 /**
1221  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1222  * @table: the sysctl table
1223  * @write: %TRUE if this is a write to the sysctl file
1224  * @buffer: the user buffer
1225  * @lenp: the size of the user buffer
1226  * @ppos: file position
1227  *
1228  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1229  * values from/to the user buffer, treated as an ASCII string. The values
1230  * are treated as milliseconds, and converted to jiffies when they are stored.
1231  *
1232  * This routine will ensure the values are within the range specified by
1233  * table->extra1 (min) and table->extra2 (max).
1234  *
1235  * Returns 0 on success.
1236  */
1237 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1238                                       void *buffer, size_t *lenp, loff_t *ppos)
1239 {
1240     return do_proc_doulongvec_minmax(table, write, buffer,
1241                                      lenp, ppos, HZ, 1000l);
1242 }
1243
1244
1245 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1246                                          int *valp,
1247                                          int write, void *data)
1248 {
1249         if (write) {
1250                 if (*lvalp > INT_MAX / HZ)
1251                         return 1;
1252                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1253         } else {
1254                 int val = *valp;
1255                 unsigned long lval;
1256                 if (val < 0) {
1257                         *negp = true;
1258                         lval = -(unsigned long)val;
1259                 } else {
1260                         *negp = false;
1261                         lval = (unsigned long)val;
1262                 }
1263                 *lvalp = lval / HZ;
1264         }
1265         return 0;
1266 }
1267
1268 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1269                                                 int *valp,
1270                                                 int write, void *data)
1271 {
1272         if (write) {
1273                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1274                         return 1;
1275                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1276         } else {
1277                 int val = *valp;
1278                 unsigned long lval;
1279                 if (val < 0) {
1280                         *negp = true;
1281                         lval = -(unsigned long)val;
1282                 } else {
1283                         *negp = false;
1284                         lval = (unsigned long)val;
1285                 }
1286                 *lvalp = jiffies_to_clock_t(lval);
1287         }
1288         return 0;
1289 }
1290
1291 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1292                                             int *valp,
1293                                             int write, void *data)
1294 {
1295         if (write) {
1296                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1297
1298                 if (jif > INT_MAX)
1299                         return 1;
1300                 *valp = (int)jif;
1301         } else {
1302                 int val = *valp;
1303                 unsigned long lval;
1304                 if (val < 0) {
1305                         *negp = true;
1306                         lval = -(unsigned long)val;
1307                 } else {
1308                         *negp = false;
1309                         lval = (unsigned long)val;
1310                 }
1311                 *lvalp = jiffies_to_msecs(lval);
1312         }
1313         return 0;
1314 }
1315
1316 /**
1317  * proc_dointvec_jiffies - read a vector of integers as seconds
1318  * @table: the sysctl table
1319  * @write: %TRUE if this is a write to the sysctl file
1320  * @buffer: the user buffer
1321  * @lenp: the size of the user buffer
1322  * @ppos: file position
1323  *
1324  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1325  * values from/to the user buffer, treated as an ASCII string.
1326  * The values read are assumed to be in seconds, and are converted into
1327  * jiffies.
1328  *
1329  * Returns 0 on success.
1330  */
1331 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1332                           void *buffer, size_t *lenp, loff_t *ppos)
1333 {
1334     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1335                             do_proc_dointvec_jiffies_conv,NULL);
1336 }
1337
1338 /**
1339  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1340  * @table: the sysctl table
1341  * @write: %TRUE if this is a write to the sysctl file
1342  * @buffer: the user buffer
1343  * @lenp: the size of the user buffer
1344  * @ppos: pointer to the file position
1345  *
1346  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1347  * values from/to the user buffer, treated as an ASCII string.
1348  * The values read are assumed to be in 1/USER_HZ seconds, and
1349  * are converted into jiffies.
1350  *
1351  * Returns 0 on success.
1352  */
1353 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1354                                  void *buffer, size_t *lenp, loff_t *ppos)
1355 {
1356     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1357                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1358 }
1359
1360 /**
1361  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1362  * @table: the sysctl table
1363  * @write: %TRUE if this is a write to the sysctl file
1364  * @buffer: the user buffer
1365  * @lenp: the size of the user buffer
1366  * @ppos: file position
1367  * @ppos: the current position in the file
1368  *
1369  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1370  * values from/to the user buffer, treated as an ASCII string.
1371  * The values read are assumed to be in 1/1000 seconds, and
1372  * are converted into jiffies.
1373  *
1374  * Returns 0 on success.
1375  */
1376 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1377                 size_t *lenp, loff_t *ppos)
1378 {
1379         return do_proc_dointvec(table, write, buffer, lenp, ppos,
1380                                 do_proc_dointvec_ms_jiffies_conv, NULL);
1381 }
1382
1383 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1384                 size_t *lenp, loff_t *ppos)
1385 {
1386         struct pid *new_pid;
1387         pid_t tmp;
1388         int r;
1389
1390         tmp = pid_vnr(cad_pid);
1391
1392         r = __do_proc_dointvec(&tmp, table, write, buffer,
1393                                lenp, ppos, NULL, NULL);
1394         if (r || !write)
1395                 return r;
1396
1397         new_pid = find_get_pid(tmp);
1398         if (!new_pid)
1399                 return -ESRCH;
1400
1401         put_pid(xchg(&cad_pid, new_pid));
1402         return 0;
1403 }
1404
1405 /**
1406  * proc_do_large_bitmap - read/write from/to a large bitmap
1407  * @table: the sysctl table
1408  * @write: %TRUE if this is a write to the sysctl file
1409  * @buffer: the user buffer
1410  * @lenp: the size of the user buffer
1411  * @ppos: file position
1412  *
1413  * The bitmap is stored at table->data and the bitmap length (in bits)
1414  * in table->maxlen.
1415  *
1416  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1417  * large bitmaps may be represented in a compact manner. Writing into
1418  * the file will clear the bitmap then update it with the given input.
1419  *
1420  * Returns 0 on success.
1421  */
1422 int proc_do_large_bitmap(struct ctl_table *table, int write,
1423                          void *buffer, size_t *lenp, loff_t *ppos)
1424 {
1425         int err = 0;
1426         bool first = 1;
1427         size_t left = *lenp;
1428         unsigned long bitmap_len = table->maxlen;
1429         unsigned long *bitmap = *(unsigned long **) table->data;
1430         unsigned long *tmp_bitmap = NULL;
1431         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1432
1433         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1434                 *lenp = 0;
1435                 return 0;
1436         }
1437
1438         if (write) {
1439                 char *p = buffer;
1440                 size_t skipped = 0;
1441
1442                 if (left > PAGE_SIZE - 1) {
1443                         left = PAGE_SIZE - 1;
1444                         /* How much of the buffer we'll skip this pass */
1445                         skipped = *lenp - left;
1446                 }
1447
1448                 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1449                 if (!tmp_bitmap)
1450                         return -ENOMEM;
1451                 proc_skip_char(&p, &left, '\n');
1452                 while (!err && left) {
1453                         unsigned long val_a, val_b;
1454                         bool neg;
1455                         size_t saved_left;
1456
1457                         /* In case we stop parsing mid-number, we can reset */
1458                         saved_left = left;
1459                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1460                                              sizeof(tr_a), &c);
1461                         /*
1462                          * If we consumed the entirety of a truncated buffer or
1463                          * only one char is left (may be a "-"), then stop here,
1464                          * reset, & come back for more.
1465                          */
1466                         if ((left <= 1) && skipped) {
1467                                 left = saved_left;
1468                                 break;
1469                         }
1470
1471                         if (err)
1472                                 break;
1473                         if (val_a >= bitmap_len || neg) {
1474                                 err = -EINVAL;
1475                                 break;
1476                         }
1477
1478                         val_b = val_a;
1479                         if (left) {
1480                                 p++;
1481                                 left--;
1482                         }
1483
1484                         if (c == '-') {
1485                                 err = proc_get_long(&p, &left, &val_b,
1486                                                      &neg, tr_b, sizeof(tr_b),
1487                                                      &c);
1488                                 /*
1489                                  * If we consumed all of a truncated buffer or
1490                                  * then stop here, reset, & come back for more.
1491                                  */
1492                                 if (!left && skipped) {
1493                                         left = saved_left;
1494                                         break;
1495                                 }
1496
1497                                 if (err)
1498                                         break;
1499                                 if (val_b >= bitmap_len || neg ||
1500                                     val_a > val_b) {
1501                                         err = -EINVAL;
1502                                         break;
1503                                 }
1504                                 if (left) {
1505                                         p++;
1506                                         left--;
1507                                 }
1508                         }
1509
1510                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1511                         first = 0;
1512                         proc_skip_char(&p, &left, '\n');
1513                 }
1514                 left += skipped;
1515         } else {
1516                 unsigned long bit_a, bit_b = 0;
1517
1518                 while (left) {
1519                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1520                         if (bit_a >= bitmap_len)
1521                                 break;
1522                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
1523                                                    bit_a + 1) - 1;
1524
1525                         if (!first)
1526                                 proc_put_char(&buffer, &left, ',');
1527                         proc_put_long(&buffer, &left, bit_a, false);
1528                         if (bit_a != bit_b) {
1529                                 proc_put_char(&buffer, &left, '-');
1530                                 proc_put_long(&buffer, &left, bit_b, false);
1531                         }
1532
1533                         first = 0; bit_b++;
1534                 }
1535                 proc_put_char(&buffer, &left, '\n');
1536         }
1537
1538         if (!err) {
1539                 if (write) {
1540                         if (*ppos)
1541                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1542                         else
1543                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1544                 }
1545                 *lenp -= left;
1546                 *ppos += *lenp;
1547         }
1548
1549         bitmap_free(tmp_bitmap);
1550         return err;
1551 }
1552
1553 #else /* CONFIG_PROC_SYSCTL */
1554
1555 int proc_dostring(struct ctl_table *table, int write,
1556                   void *buffer, size_t *lenp, loff_t *ppos)
1557 {
1558         return -ENOSYS;
1559 }
1560
1561 int proc_dointvec(struct ctl_table *table, int write,
1562                   void *buffer, size_t *lenp, loff_t *ppos)
1563 {
1564         return -ENOSYS;
1565 }
1566
1567 int proc_douintvec(struct ctl_table *table, int write,
1568                   void *buffer, size_t *lenp, loff_t *ppos)
1569 {
1570         return -ENOSYS;
1571 }
1572
1573 int proc_dointvec_minmax(struct ctl_table *table, int write,
1574                     void *buffer, size_t *lenp, loff_t *ppos)
1575 {
1576         return -ENOSYS;
1577 }
1578
1579 int proc_douintvec_minmax(struct ctl_table *table, int write,
1580                           void *buffer, size_t *lenp, loff_t *ppos)
1581 {
1582         return -ENOSYS;
1583 }
1584
1585 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1586                     void *buffer, size_t *lenp, loff_t *ppos)
1587 {
1588         return -ENOSYS;
1589 }
1590
1591 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1592                     void *buffer, size_t *lenp, loff_t *ppos)
1593 {
1594         return -ENOSYS;
1595 }
1596
1597 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1598                              void *buffer, size_t *lenp, loff_t *ppos)
1599 {
1600         return -ENOSYS;
1601 }
1602
1603 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1604                     void *buffer, size_t *lenp, loff_t *ppos)
1605 {
1606         return -ENOSYS;
1607 }
1608
1609 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1610                                       void *buffer, size_t *lenp, loff_t *ppos)
1611 {
1612         return -ENOSYS;
1613 }
1614
1615 int proc_do_large_bitmap(struct ctl_table *table, int write,
1616                          void *buffer, size_t *lenp, loff_t *ppos)
1617 {
1618         return -ENOSYS;
1619 }
1620
1621 #endif /* CONFIG_PROC_SYSCTL */
1622
1623 #if defined(CONFIG_SYSCTL)
1624 int proc_do_static_key(struct ctl_table *table, int write,
1625                        void *buffer, size_t *lenp, loff_t *ppos)
1626 {
1627         struct static_key *key = (struct static_key *)table->data;
1628         static DEFINE_MUTEX(static_key_mutex);
1629         int val, ret;
1630         struct ctl_table tmp = {
1631                 .data   = &val,
1632                 .maxlen = sizeof(val),
1633                 .mode   = table->mode,
1634                 .extra1 = SYSCTL_ZERO,
1635                 .extra2 = SYSCTL_ONE,
1636         };
1637
1638         if (write && !capable(CAP_SYS_ADMIN))
1639                 return -EPERM;
1640
1641         mutex_lock(&static_key_mutex);
1642         val = static_key_enabled(key);
1643         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1644         if (write && !ret) {
1645                 if (val)
1646                         static_key_enable(key);
1647                 else
1648                         static_key_disable(key);
1649         }
1650         mutex_unlock(&static_key_mutex);
1651         return ret;
1652 }
1653
1654 static struct ctl_table kern_table[] = {
1655         {
1656                 .procname       = "sched_child_runs_first",
1657                 .data           = &sysctl_sched_child_runs_first,
1658                 .maxlen         = sizeof(unsigned int),
1659                 .mode           = 0644,
1660                 .proc_handler   = proc_dointvec,
1661         },
1662 #ifdef CONFIG_SCHED_DEBUG
1663         {
1664                 .procname       = "sched_min_granularity_ns",
1665                 .data           = &sysctl_sched_min_granularity,
1666                 .maxlen         = sizeof(unsigned int),
1667                 .mode           = 0644,
1668                 .proc_handler   = sched_proc_update_handler,
1669                 .extra1         = &min_sched_granularity_ns,
1670                 .extra2         = &max_sched_granularity_ns,
1671         },
1672         {
1673                 .procname       = "sched_latency_ns",
1674                 .data           = &sysctl_sched_latency,
1675                 .maxlen         = sizeof(unsigned int),
1676                 .mode           = 0644,
1677                 .proc_handler   = sched_proc_update_handler,
1678                 .extra1         = &min_sched_granularity_ns,
1679                 .extra2         = &max_sched_granularity_ns,
1680         },
1681         {
1682                 .procname       = "sched_wakeup_granularity_ns",
1683                 .data           = &sysctl_sched_wakeup_granularity,
1684                 .maxlen         = sizeof(unsigned int),
1685                 .mode           = 0644,
1686                 .proc_handler   = sched_proc_update_handler,
1687                 .extra1         = &min_wakeup_granularity_ns,
1688                 .extra2         = &max_wakeup_granularity_ns,
1689         },
1690 #ifdef CONFIG_SMP
1691         {
1692                 .procname       = "sched_tunable_scaling",
1693                 .data           = &sysctl_sched_tunable_scaling,
1694                 .maxlen         = sizeof(enum sched_tunable_scaling),
1695                 .mode           = 0644,
1696                 .proc_handler   = sched_proc_update_handler,
1697                 .extra1         = &min_sched_tunable_scaling,
1698                 .extra2         = &max_sched_tunable_scaling,
1699         },
1700         {
1701                 .procname       = "sched_migration_cost_ns",
1702                 .data           = &sysctl_sched_migration_cost,
1703                 .maxlen         = sizeof(unsigned int),
1704                 .mode           = 0644,
1705                 .proc_handler   = proc_dointvec,
1706         },
1707         {
1708                 .procname       = "sched_nr_migrate",
1709                 .data           = &sysctl_sched_nr_migrate,
1710                 .maxlen         = sizeof(unsigned int),
1711                 .mode           = 0644,
1712                 .proc_handler   = proc_dointvec,
1713         },
1714 #ifdef CONFIG_SCHEDSTATS
1715         {
1716                 .procname       = "sched_schedstats",
1717                 .data           = NULL,
1718                 .maxlen         = sizeof(unsigned int),
1719                 .mode           = 0644,
1720                 .proc_handler   = sysctl_schedstats,
1721                 .extra1         = SYSCTL_ZERO,
1722                 .extra2         = SYSCTL_ONE,
1723         },
1724 #endif /* CONFIG_SCHEDSTATS */
1725 #endif /* CONFIG_SMP */
1726 #ifdef CONFIG_NUMA_BALANCING
1727         {
1728                 .procname       = "numa_balancing_scan_delay_ms",
1729                 .data           = &sysctl_numa_balancing_scan_delay,
1730                 .maxlen         = sizeof(unsigned int),
1731                 .mode           = 0644,
1732                 .proc_handler   = proc_dointvec,
1733         },
1734         {
1735                 .procname       = "numa_balancing_scan_period_min_ms",
1736                 .data           = &sysctl_numa_balancing_scan_period_min,
1737                 .maxlen         = sizeof(unsigned int),
1738                 .mode           = 0644,
1739                 .proc_handler   = proc_dointvec,
1740         },
1741         {
1742                 .procname       = "numa_balancing_scan_period_max_ms",
1743                 .data           = &sysctl_numa_balancing_scan_period_max,
1744                 .maxlen         = sizeof(unsigned int),
1745                 .mode           = 0644,
1746                 .proc_handler   = proc_dointvec,
1747         },
1748         {
1749                 .procname       = "numa_balancing_scan_size_mb",
1750                 .data           = &sysctl_numa_balancing_scan_size,
1751                 .maxlen         = sizeof(unsigned int),
1752                 .mode           = 0644,
1753                 .proc_handler   = proc_dointvec_minmax,
1754                 .extra1         = SYSCTL_ONE,
1755         },
1756         {
1757                 .procname       = "numa_balancing",
1758                 .data           = NULL, /* filled in by handler */
1759                 .maxlen         = sizeof(unsigned int),
1760                 .mode           = 0644,
1761                 .proc_handler   = sysctl_numa_balancing,
1762                 .extra1         = SYSCTL_ZERO,
1763                 .extra2         = SYSCTL_ONE,
1764         },
1765 #endif /* CONFIG_NUMA_BALANCING */
1766 #endif /* CONFIG_SCHED_DEBUG */
1767         {
1768                 .procname       = "sched_rt_period_us",
1769                 .data           = &sysctl_sched_rt_period,
1770                 .maxlen         = sizeof(unsigned int),
1771                 .mode           = 0644,
1772                 .proc_handler   = sched_rt_handler,
1773         },
1774         {
1775                 .procname       = "sched_rt_runtime_us",
1776                 .data           = &sysctl_sched_rt_runtime,
1777                 .maxlen         = sizeof(int),
1778                 .mode           = 0644,
1779                 .proc_handler   = sched_rt_handler,
1780         },
1781         {
1782                 .procname       = "sched_deadline_period_max_us",
1783                 .data           = &sysctl_sched_dl_period_max,
1784                 .maxlen         = sizeof(unsigned int),
1785                 .mode           = 0644,
1786                 .proc_handler   = proc_dointvec,
1787         },
1788         {
1789                 .procname       = "sched_deadline_period_min_us",
1790                 .data           = &sysctl_sched_dl_period_min,
1791                 .maxlen         = sizeof(unsigned int),
1792                 .mode           = 0644,
1793                 .proc_handler   = proc_dointvec,
1794         },
1795         {
1796                 .procname       = "sched_rr_timeslice_ms",
1797                 .data           = &sysctl_sched_rr_timeslice,
1798                 .maxlen         = sizeof(int),
1799                 .mode           = 0644,
1800                 .proc_handler   = sched_rr_handler,
1801         },
1802 #ifdef CONFIG_UCLAMP_TASK
1803         {
1804                 .procname       = "sched_util_clamp_min",
1805                 .data           = &sysctl_sched_uclamp_util_min,
1806                 .maxlen         = sizeof(unsigned int),
1807                 .mode           = 0644,
1808                 .proc_handler   = sysctl_sched_uclamp_handler,
1809         },
1810         {
1811                 .procname       = "sched_util_clamp_max",
1812                 .data           = &sysctl_sched_uclamp_util_max,
1813                 .maxlen         = sizeof(unsigned int),
1814                 .mode           = 0644,
1815                 .proc_handler   = sysctl_sched_uclamp_handler,
1816         },
1817         {
1818                 .procname       = "sched_util_clamp_min_rt_default",
1819                 .data           = &sysctl_sched_uclamp_util_min_rt_default,
1820                 .maxlen         = sizeof(unsigned int),
1821                 .mode           = 0644,
1822                 .proc_handler   = sysctl_sched_uclamp_handler,
1823         },
1824 #endif
1825 #ifdef CONFIG_SCHED_AUTOGROUP
1826         {
1827                 .procname       = "sched_autogroup_enabled",
1828                 .data           = &sysctl_sched_autogroup_enabled,
1829                 .maxlen         = sizeof(unsigned int),
1830                 .mode           = 0644,
1831                 .proc_handler   = proc_dointvec_minmax,
1832                 .extra1         = SYSCTL_ZERO,
1833                 .extra2         = SYSCTL_ONE,
1834         },
1835 #endif
1836 #ifdef CONFIG_CFS_BANDWIDTH
1837         {
1838                 .procname       = "sched_cfs_bandwidth_slice_us",
1839                 .data           = &sysctl_sched_cfs_bandwidth_slice,
1840                 .maxlen         = sizeof(unsigned int),
1841                 .mode           = 0644,
1842                 .proc_handler   = proc_dointvec_minmax,
1843                 .extra1         = SYSCTL_ONE,
1844         },
1845 #endif
1846 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1847         {
1848                 .procname       = "sched_energy_aware",
1849                 .data           = &sysctl_sched_energy_aware,
1850                 .maxlen         = sizeof(unsigned int),
1851                 .mode           = 0644,
1852                 .proc_handler   = sched_energy_aware_handler,
1853                 .extra1         = SYSCTL_ZERO,
1854                 .extra2         = SYSCTL_ONE,
1855         },
1856 #endif
1857 #ifdef CONFIG_PROVE_LOCKING
1858         {
1859                 .procname       = "prove_locking",
1860                 .data           = &prove_locking,
1861                 .maxlen         = sizeof(int),
1862                 .mode           = 0644,
1863                 .proc_handler   = proc_dointvec,
1864         },
1865 #endif
1866 #ifdef CONFIG_LOCK_STAT
1867         {
1868                 .procname       = "lock_stat",
1869                 .data           = &lock_stat,
1870                 .maxlen         = sizeof(int),
1871                 .mode           = 0644,
1872                 .proc_handler   = proc_dointvec,
1873         },
1874 #endif
1875         {
1876                 .procname       = "panic",
1877                 .data           = &panic_timeout,
1878                 .maxlen         = sizeof(int),
1879                 .mode           = 0644,
1880                 .proc_handler   = proc_dointvec,
1881         },
1882 #ifdef CONFIG_COREDUMP
1883         {
1884                 .procname       = "core_uses_pid",
1885                 .data           = &core_uses_pid,
1886                 .maxlen         = sizeof(int),
1887                 .mode           = 0644,
1888                 .proc_handler   = proc_dointvec,
1889         },
1890         {
1891                 .procname       = "core_pattern",
1892                 .data           = core_pattern,
1893                 .maxlen         = CORENAME_MAX_SIZE,
1894                 .mode           = 0644,
1895                 .proc_handler   = proc_dostring_coredump,
1896         },
1897         {
1898                 .procname       = "core_pipe_limit",
1899                 .data           = &core_pipe_limit,
1900                 .maxlen         = sizeof(unsigned int),
1901                 .mode           = 0644,
1902                 .proc_handler   = proc_dointvec,
1903         },
1904 #endif
1905 #ifdef CONFIG_PROC_SYSCTL
1906         {
1907                 .procname       = "tainted",
1908                 .maxlen         = sizeof(long),
1909                 .mode           = 0644,
1910                 .proc_handler   = proc_taint,
1911         },
1912         {
1913                 .procname       = "sysctl_writes_strict",
1914                 .data           = &sysctl_writes_strict,
1915                 .maxlen         = sizeof(int),
1916                 .mode           = 0644,
1917                 .proc_handler   = proc_dointvec_minmax,
1918                 .extra1         = &neg_one,
1919                 .extra2         = SYSCTL_ONE,
1920         },
1921 #endif
1922 #ifdef CONFIG_LATENCYTOP
1923         {
1924                 .procname       = "latencytop",
1925                 .data           = &latencytop_enabled,
1926                 .maxlen         = sizeof(int),
1927                 .mode           = 0644,
1928                 .proc_handler   = sysctl_latencytop,
1929         },
1930 #endif
1931 #ifdef CONFIG_BLK_DEV_INITRD
1932         {
1933                 .procname       = "real-root-dev",
1934                 .data           = &real_root_dev,
1935                 .maxlen         = sizeof(int),
1936                 .mode           = 0644,
1937                 .proc_handler   = proc_dointvec,
1938         },
1939 #endif
1940         {
1941                 .procname       = "print-fatal-signals",
1942                 .data           = &print_fatal_signals,
1943                 .maxlen         = sizeof(int),
1944                 .mode           = 0644,
1945                 .proc_handler   = proc_dointvec,
1946         },
1947 #ifdef CONFIG_SPARC
1948         {
1949                 .procname       = "reboot-cmd",
1950                 .data           = reboot_command,
1951                 .maxlen         = 256,
1952                 .mode           = 0644,
1953                 .proc_handler   = proc_dostring,
1954         },
1955         {
1956                 .procname       = "stop-a",
1957                 .data           = &stop_a_enabled,
1958                 .maxlen         = sizeof (int),
1959                 .mode           = 0644,
1960                 .proc_handler   = proc_dointvec,
1961         },
1962         {
1963                 .procname       = "scons-poweroff",
1964                 .data           = &scons_pwroff,
1965                 .maxlen         = sizeof (int),
1966                 .mode           = 0644,
1967                 .proc_handler   = proc_dointvec,
1968         },
1969 #endif
1970 #ifdef CONFIG_SPARC64
1971         {
1972                 .procname       = "tsb-ratio",
1973                 .data           = &sysctl_tsb_ratio,
1974                 .maxlen         = sizeof (int),
1975                 .mode           = 0644,
1976                 .proc_handler   = proc_dointvec,
1977         },
1978 #endif
1979 #ifdef CONFIG_PARISC
1980         {
1981                 .procname       = "soft-power",
1982                 .data           = &pwrsw_enabled,
1983                 .maxlen         = sizeof (int),
1984                 .mode           = 0644,
1985                 .proc_handler   = proc_dointvec,
1986         },
1987 #endif
1988 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1989         {
1990                 .procname       = "unaligned-trap",
1991                 .data           = &unaligned_enabled,
1992                 .maxlen         = sizeof (int),
1993                 .mode           = 0644,
1994                 .proc_handler   = proc_dointvec,
1995         },
1996 #endif
1997         {
1998                 .procname       = "ctrl-alt-del",
1999                 .data           = &C_A_D,
2000                 .maxlen         = sizeof(int),
2001                 .mode           = 0644,
2002                 .proc_handler   = proc_dointvec,
2003         },
2004 #ifdef CONFIG_FUNCTION_TRACER
2005         {
2006                 .procname       = "ftrace_enabled",
2007                 .data           = &ftrace_enabled,
2008                 .maxlen         = sizeof(int),
2009                 .mode           = 0644,
2010                 .proc_handler   = ftrace_enable_sysctl,
2011         },
2012 #endif
2013 #ifdef CONFIG_STACK_TRACER
2014         {
2015                 .procname       = "stack_tracer_enabled",
2016                 .data           = &stack_tracer_enabled,
2017                 .maxlen         = sizeof(int),
2018                 .mode           = 0644,
2019                 .proc_handler   = stack_trace_sysctl,
2020         },
2021 #endif
2022 #ifdef CONFIG_TRACING
2023         {
2024                 .procname       = "ftrace_dump_on_oops",
2025                 .data           = &ftrace_dump_on_oops,
2026                 .maxlen         = sizeof(int),
2027                 .mode           = 0644,
2028                 .proc_handler   = proc_dointvec,
2029         },
2030         {
2031                 .procname       = "traceoff_on_warning",
2032                 .data           = &__disable_trace_on_warning,
2033                 .maxlen         = sizeof(__disable_trace_on_warning),
2034                 .mode           = 0644,
2035                 .proc_handler   = proc_dointvec,
2036         },
2037         {
2038                 .procname       = "tracepoint_printk",
2039                 .data           = &tracepoint_printk,
2040                 .maxlen         = sizeof(tracepoint_printk),
2041                 .mode           = 0644,
2042                 .proc_handler   = tracepoint_printk_sysctl,
2043         },
2044 #endif
2045 #ifdef CONFIG_KEXEC_CORE
2046         {
2047                 .procname       = "kexec_load_disabled",
2048                 .data           = &kexec_load_disabled,
2049                 .maxlen         = sizeof(int),
2050                 .mode           = 0644,
2051                 /* only handle a transition from default "0" to "1" */
2052                 .proc_handler   = proc_dointvec_minmax,
2053                 .extra1         = SYSCTL_ONE,
2054                 .extra2         = SYSCTL_ONE,
2055         },
2056 #endif
2057 #ifdef CONFIG_MODULES
2058         {
2059                 .procname       = "modprobe",
2060                 .data           = &modprobe_path,
2061                 .maxlen         = KMOD_PATH_LEN,
2062                 .mode           = 0644,
2063                 .proc_handler   = proc_dostring,
2064         },
2065         {
2066                 .procname       = "modules_disabled",
2067                 .data           = &modules_disabled,
2068                 .maxlen         = sizeof(int),
2069                 .mode           = 0644,
2070                 /* only handle a transition from default "0" to "1" */
2071                 .proc_handler   = proc_dointvec_minmax,
2072                 .extra1         = SYSCTL_ONE,
2073                 .extra2         = SYSCTL_ONE,
2074         },
2075 #endif
2076 #ifdef CONFIG_UEVENT_HELPER
2077         {
2078                 .procname       = "hotplug",
2079                 .data           = &uevent_helper,
2080                 .maxlen         = UEVENT_HELPER_PATH_LEN,
2081                 .mode           = 0644,
2082                 .proc_handler   = proc_dostring,
2083         },
2084 #endif
2085 #ifdef CONFIG_CHR_DEV_SG
2086         {
2087                 .procname       = "sg-big-buff",
2088                 .data           = &sg_big_buff,
2089                 .maxlen         = sizeof (int),
2090                 .mode           = 0444,
2091                 .proc_handler   = proc_dointvec,
2092         },
2093 #endif
2094 #ifdef CONFIG_BSD_PROCESS_ACCT
2095         {
2096                 .procname       = "acct",
2097                 .data           = &acct_parm,
2098                 .maxlen         = 3*sizeof(int),
2099                 .mode           = 0644,
2100                 .proc_handler   = proc_dointvec,
2101         },
2102 #endif
2103 #ifdef CONFIG_MAGIC_SYSRQ
2104         {
2105                 .procname       = "sysrq",
2106                 .data           = NULL,
2107                 .maxlen         = sizeof (int),
2108                 .mode           = 0644,
2109                 .proc_handler   = sysrq_sysctl_handler,
2110         },
2111 #endif
2112 #ifdef CONFIG_PROC_SYSCTL
2113         {
2114                 .procname       = "cad_pid",
2115                 .data           = NULL,
2116                 .maxlen         = sizeof (int),
2117                 .mode           = 0600,
2118                 .proc_handler   = proc_do_cad_pid,
2119         },
2120 #endif
2121         {
2122                 .procname       = "threads-max",
2123                 .data           = NULL,
2124                 .maxlen         = sizeof(int),
2125                 .mode           = 0644,
2126                 .proc_handler   = sysctl_max_threads,
2127         },
2128         {
2129                 .procname       = "random",
2130                 .mode           = 0555,
2131                 .child          = random_table,
2132         },
2133         {
2134                 .procname       = "usermodehelper",
2135                 .mode           = 0555,
2136                 .child          = usermodehelper_table,
2137         },
2138 #ifdef CONFIG_FW_LOADER_USER_HELPER
2139         {
2140                 .procname       = "firmware_config",
2141                 .mode           = 0555,
2142                 .child          = firmware_config_table,
2143         },
2144 #endif
2145         {
2146                 .procname       = "overflowuid",
2147                 .data           = &overflowuid,
2148                 .maxlen         = sizeof(int),
2149                 .mode           = 0644,
2150                 .proc_handler   = proc_dointvec_minmax,
2151                 .extra1         = &minolduid,
2152                 .extra2         = &maxolduid,
2153         },
2154         {
2155                 .procname       = "overflowgid",
2156                 .data           = &overflowgid,
2157                 .maxlen         = sizeof(int),
2158                 .mode           = 0644,
2159                 .proc_handler   = proc_dointvec_minmax,
2160                 .extra1         = &minolduid,
2161                 .extra2         = &maxolduid,
2162         },
2163 #ifdef CONFIG_S390
2164         {
2165                 .procname       = "userprocess_debug",
2166                 .data           = &show_unhandled_signals,
2167                 .maxlen         = sizeof(int),
2168                 .mode           = 0644,
2169                 .proc_handler   = proc_dointvec,
2170         },
2171 #endif
2172 #ifdef CONFIG_SMP
2173         {
2174                 .procname       = "oops_all_cpu_backtrace",
2175                 .data           = &sysctl_oops_all_cpu_backtrace,
2176                 .maxlen         = sizeof(int),
2177                 .mode           = 0644,
2178                 .proc_handler   = proc_dointvec_minmax,
2179                 .extra1         = SYSCTL_ZERO,
2180                 .extra2         = SYSCTL_ONE,
2181         },
2182 #endif /* CONFIG_SMP */
2183         {
2184                 .procname       = "pid_max",
2185                 .data           = &pid_max,
2186                 .maxlen         = sizeof (int),
2187                 .mode           = 0644,
2188                 .proc_handler   = proc_dointvec_minmax,
2189                 .extra1         = &pid_max_min,
2190                 .extra2         = &pid_max_max,
2191         },
2192         {
2193                 .procname       = "panic_on_oops",
2194                 .data           = &panic_on_oops,
2195                 .maxlen         = sizeof(int),
2196                 .mode           = 0644,
2197                 .proc_handler   = proc_dointvec,
2198         },
2199         {
2200                 .procname       = "panic_print",
2201                 .data           = &panic_print,
2202                 .maxlen         = sizeof(unsigned long),
2203                 .mode           = 0644,
2204                 .proc_handler   = proc_doulongvec_minmax,
2205         },
2206 #if defined CONFIG_PRINTK
2207         {
2208                 .procname       = "printk",
2209                 .data           = &console_loglevel,
2210                 .maxlen         = 4*sizeof(int),
2211                 .mode           = 0644,
2212                 .proc_handler   = proc_dointvec,
2213         },
2214         {
2215                 .procname       = "printk_ratelimit",
2216                 .data           = &printk_ratelimit_state.interval,
2217                 .maxlen         = sizeof(int),
2218                 .mode           = 0644,
2219                 .proc_handler   = proc_dointvec_jiffies,
2220         },
2221         {
2222                 .procname       = "printk_ratelimit_burst",
2223                 .data           = &printk_ratelimit_state.burst,
2224                 .maxlen         = sizeof(int),
2225                 .mode           = 0644,
2226                 .proc_handler   = proc_dointvec,
2227         },
2228         {
2229                 .procname       = "printk_delay",
2230                 .data           = &printk_delay_msec,
2231                 .maxlen         = sizeof(int),
2232                 .mode           = 0644,
2233                 .proc_handler   = proc_dointvec_minmax,
2234                 .extra1         = SYSCTL_ZERO,
2235                 .extra2         = &ten_thousand,
2236         },
2237         {
2238                 .procname       = "printk_devkmsg",
2239                 .data           = devkmsg_log_str,
2240                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
2241                 .mode           = 0644,
2242                 .proc_handler   = devkmsg_sysctl_set_loglvl,
2243         },
2244         {
2245                 .procname       = "dmesg_restrict",
2246                 .data           = &dmesg_restrict,
2247                 .maxlen         = sizeof(int),
2248                 .mode           = 0644,
2249                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2250                 .extra1         = SYSCTL_ZERO,
2251                 .extra2         = SYSCTL_ONE,
2252         },
2253         {
2254                 .procname       = "kptr_restrict",
2255                 .data           = &kptr_restrict,
2256                 .maxlen         = sizeof(int),
2257                 .mode           = 0644,
2258                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2259                 .extra1         = SYSCTL_ZERO,
2260                 .extra2         = &two,
2261         },
2262 #endif
2263         {
2264                 .procname       = "ngroups_max",
2265                 .data           = &ngroups_max,
2266                 .maxlen         = sizeof (int),
2267                 .mode           = 0444,
2268                 .proc_handler   = proc_dointvec,
2269         },
2270         {
2271                 .procname       = "cap_last_cap",
2272                 .data           = (void *)&cap_last_cap,
2273                 .maxlen         = sizeof(int),
2274                 .mode           = 0444,
2275                 .proc_handler   = proc_dointvec,
2276         },
2277 #if defined(CONFIG_LOCKUP_DETECTOR)
2278         {
2279                 .procname       = "watchdog",
2280                 .data           = &watchdog_user_enabled,
2281                 .maxlen         = sizeof(int),
2282                 .mode           = 0644,
2283                 .proc_handler   = proc_watchdog,
2284                 .extra1         = SYSCTL_ZERO,
2285                 .extra2         = SYSCTL_ONE,
2286         },
2287         {
2288                 .procname       = "watchdog_thresh",
2289                 .data           = &watchdog_thresh,
2290                 .maxlen         = sizeof(int),
2291                 .mode           = 0644,
2292                 .proc_handler   = proc_watchdog_thresh,
2293                 .extra1         = SYSCTL_ZERO,
2294                 .extra2         = &sixty,
2295         },
2296         {
2297                 .procname       = "nmi_watchdog",
2298                 .data           = &nmi_watchdog_user_enabled,
2299                 .maxlen         = sizeof(int),
2300                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
2301                 .proc_handler   = proc_nmi_watchdog,
2302                 .extra1         = SYSCTL_ZERO,
2303                 .extra2         = SYSCTL_ONE,
2304         },
2305         {
2306                 .procname       = "watchdog_cpumask",
2307                 .data           = &watchdog_cpumask_bits,
2308                 .maxlen         = NR_CPUS,
2309                 .mode           = 0644,
2310                 .proc_handler   = proc_watchdog_cpumask,
2311         },
2312 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2313         {
2314                 .procname       = "soft_watchdog",
2315                 .data           = &soft_watchdog_user_enabled,
2316                 .maxlen         = sizeof(int),
2317                 .mode           = 0644,
2318                 .proc_handler   = proc_soft_watchdog,
2319                 .extra1         = SYSCTL_ZERO,
2320                 .extra2         = SYSCTL_ONE,
2321         },
2322         {
2323                 .procname       = "softlockup_panic",
2324                 .data           = &softlockup_panic,
2325                 .maxlen         = sizeof(int),
2326                 .mode           = 0644,
2327                 .proc_handler   = proc_dointvec_minmax,
2328                 .extra1         = SYSCTL_ZERO,
2329                 .extra2         = SYSCTL_ONE,
2330         },
2331 #ifdef CONFIG_SMP
2332         {
2333                 .procname       = "softlockup_all_cpu_backtrace",
2334                 .data           = &sysctl_softlockup_all_cpu_backtrace,
2335                 .maxlen         = sizeof(int),
2336                 .mode           = 0644,
2337                 .proc_handler   = proc_dointvec_minmax,
2338                 .extra1         = SYSCTL_ZERO,
2339                 .extra2         = SYSCTL_ONE,
2340         },
2341 #endif /* CONFIG_SMP */
2342 #endif
2343 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2344         {
2345                 .procname       = "hardlockup_panic",
2346                 .data           = &hardlockup_panic,
2347                 .maxlen         = sizeof(int),
2348                 .mode           = 0644,
2349                 .proc_handler   = proc_dointvec_minmax,
2350                 .extra1         = SYSCTL_ZERO,
2351                 .extra2         = SYSCTL_ONE,
2352         },
2353 #ifdef CONFIG_SMP
2354         {
2355                 .procname       = "hardlockup_all_cpu_backtrace",
2356                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
2357                 .maxlen         = sizeof(int),
2358                 .mode           = 0644,
2359                 .proc_handler   = proc_dointvec_minmax,
2360                 .extra1         = SYSCTL_ZERO,
2361                 .extra2         = SYSCTL_ONE,
2362         },
2363 #endif /* CONFIG_SMP */
2364 #endif
2365 #endif
2366
2367 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2368         {
2369                 .procname       = "unknown_nmi_panic",
2370                 .data           = &unknown_nmi_panic,
2371                 .maxlen         = sizeof (int),
2372                 .mode           = 0644,
2373                 .proc_handler   = proc_dointvec,
2374         },
2375 #endif
2376
2377 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2378         defined(CONFIG_DEBUG_STACKOVERFLOW)
2379         {
2380                 .procname       = "panic_on_stackoverflow",
2381                 .data           = &sysctl_panic_on_stackoverflow,
2382                 .maxlen         = sizeof(int),
2383                 .mode           = 0644,
2384                 .proc_handler   = proc_dointvec,
2385         },
2386 #endif
2387 #if defined(CONFIG_X86)
2388         {
2389                 .procname       = "panic_on_unrecovered_nmi",
2390                 .data           = &panic_on_unrecovered_nmi,
2391                 .maxlen         = sizeof(int),
2392                 .mode           = 0644,
2393                 .proc_handler   = proc_dointvec,
2394         },
2395         {
2396                 .procname       = "panic_on_io_nmi",
2397                 .data           = &panic_on_io_nmi,
2398                 .maxlen         = sizeof(int),
2399                 .mode           = 0644,
2400                 .proc_handler   = proc_dointvec,
2401         },
2402         {
2403                 .procname       = "bootloader_type",
2404                 .data           = &bootloader_type,
2405                 .maxlen         = sizeof (int),
2406                 .mode           = 0444,
2407                 .proc_handler   = proc_dointvec,
2408         },
2409         {
2410                 .procname       = "bootloader_version",
2411                 .data           = &bootloader_version,
2412                 .maxlen         = sizeof (int),
2413                 .mode           = 0444,
2414                 .proc_handler   = proc_dointvec,
2415         },
2416         {
2417                 .procname       = "io_delay_type",
2418                 .data           = &io_delay_type,
2419                 .maxlen         = sizeof(int),
2420                 .mode           = 0644,
2421                 .proc_handler   = proc_dointvec,
2422         },
2423 #endif
2424 #if defined(CONFIG_MMU)
2425         {
2426                 .procname       = "randomize_va_space",
2427                 .data           = &randomize_va_space,
2428                 .maxlen         = sizeof(int),
2429                 .mode           = 0644,
2430                 .proc_handler   = proc_dointvec,
2431         },
2432 #endif
2433 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2434         {
2435                 .procname       = "spin_retry",
2436                 .data           = &spin_retry,
2437                 .maxlen         = sizeof (int),
2438                 .mode           = 0644,
2439                 .proc_handler   = proc_dointvec,
2440         },
2441 #endif
2442 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2443         {
2444                 .procname       = "acpi_video_flags",
2445                 .data           = &acpi_realmode_flags,
2446                 .maxlen         = sizeof (unsigned long),
2447                 .mode           = 0644,
2448                 .proc_handler   = proc_doulongvec_minmax,
2449         },
2450 #endif
2451 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2452         {
2453                 .procname       = "ignore-unaligned-usertrap",
2454                 .data           = &no_unaligned_warning,
2455                 .maxlen         = sizeof (int),
2456                 .mode           = 0644,
2457                 .proc_handler   = proc_dointvec,
2458         },
2459 #endif
2460 #ifdef CONFIG_IA64
2461         {
2462                 .procname       = "unaligned-dump-stack",
2463                 .data           = &unaligned_dump_stack,
2464                 .maxlen         = sizeof (int),
2465                 .mode           = 0644,
2466                 .proc_handler   = proc_dointvec,
2467         },
2468 #endif
2469 #ifdef CONFIG_DETECT_HUNG_TASK
2470 #ifdef CONFIG_SMP
2471         {
2472                 .procname       = "hung_task_all_cpu_backtrace",
2473                 .data           = &sysctl_hung_task_all_cpu_backtrace,
2474                 .maxlen         = sizeof(int),
2475                 .mode           = 0644,
2476                 .proc_handler   = proc_dointvec_minmax,
2477                 .extra1         = SYSCTL_ZERO,
2478                 .extra2         = SYSCTL_ONE,
2479         },
2480 #endif /* CONFIG_SMP */
2481         {
2482                 .procname       = "hung_task_panic",
2483                 .data           = &sysctl_hung_task_panic,
2484                 .maxlen         = sizeof(int),
2485                 .mode           = 0644,
2486                 .proc_handler   = proc_dointvec_minmax,
2487                 .extra1         = SYSCTL_ZERO,
2488                 .extra2         = SYSCTL_ONE,
2489         },
2490         {
2491                 .procname       = "hung_task_check_count",
2492                 .data           = &sysctl_hung_task_check_count,
2493                 .maxlen         = sizeof(int),
2494                 .mode           = 0644,
2495                 .proc_handler   = proc_dointvec_minmax,
2496                 .extra1         = SYSCTL_ZERO,
2497         },
2498         {
2499                 .procname       = "hung_task_timeout_secs",
2500                 .data           = &sysctl_hung_task_timeout_secs,
2501                 .maxlen         = sizeof(unsigned long),
2502                 .mode           = 0644,
2503                 .proc_handler   = proc_dohung_task_timeout_secs,
2504                 .extra2         = &hung_task_timeout_max,
2505         },
2506         {
2507                 .procname       = "hung_task_check_interval_secs",
2508                 .data           = &sysctl_hung_task_check_interval_secs,
2509                 .maxlen         = sizeof(unsigned long),
2510                 .mode           = 0644,
2511                 .proc_handler   = proc_dohung_task_timeout_secs,
2512                 .extra2         = &hung_task_timeout_max,
2513         },
2514         {
2515                 .procname       = "hung_task_warnings",
2516                 .data           = &sysctl_hung_task_warnings,
2517                 .maxlen         = sizeof(int),
2518                 .mode           = 0644,
2519                 .proc_handler   = proc_dointvec_minmax,
2520                 .extra1         = &neg_one,
2521         },
2522 #endif
2523 #ifdef CONFIG_RT_MUTEXES
2524         {
2525                 .procname       = "max_lock_depth",
2526                 .data           = &max_lock_depth,
2527                 .maxlen         = sizeof(int),
2528                 .mode           = 0644,
2529                 .proc_handler   = proc_dointvec,
2530         },
2531 #endif
2532         {
2533                 .procname       = "poweroff_cmd",
2534                 .data           = &poweroff_cmd,
2535                 .maxlen         = POWEROFF_CMD_PATH_LEN,
2536                 .mode           = 0644,
2537                 .proc_handler   = proc_dostring,
2538         },
2539 #ifdef CONFIG_KEYS
2540         {
2541                 .procname       = "keys",
2542                 .mode           = 0555,
2543                 .child          = key_sysctls,
2544         },
2545 #endif
2546 #ifdef CONFIG_PERF_EVENTS
2547         /*
2548          * User-space scripts rely on the existence of this file
2549          * as a feature check for perf_events being enabled.
2550          *
2551          * So it's an ABI, do not remove!
2552          */
2553         {
2554                 .procname       = "perf_event_paranoid",
2555                 .data           = &sysctl_perf_event_paranoid,
2556                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
2557                 .mode           = 0644,
2558                 .proc_handler   = proc_dointvec,
2559         },
2560         {
2561                 .procname       = "perf_event_mlock_kb",
2562                 .data           = &sysctl_perf_event_mlock,
2563                 .maxlen         = sizeof(sysctl_perf_event_mlock),
2564                 .mode           = 0644,
2565                 .proc_handler   = proc_dointvec,
2566         },
2567         {
2568                 .procname       = "perf_event_max_sample_rate",
2569                 .data           = &sysctl_perf_event_sample_rate,
2570                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
2571                 .mode           = 0644,
2572                 .proc_handler   = perf_proc_update_handler,
2573                 .extra1         = SYSCTL_ONE,
2574         },
2575         {
2576                 .procname       = "perf_cpu_time_max_percent",
2577                 .data           = &sysctl_perf_cpu_time_max_percent,
2578                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
2579                 .mode           = 0644,
2580                 .proc_handler   = perf_cpu_time_max_percent_handler,
2581                 .extra1         = SYSCTL_ZERO,
2582                 .extra2         = &one_hundred,
2583         },
2584         {
2585                 .procname       = "perf_event_max_stack",
2586                 .data           = &sysctl_perf_event_max_stack,
2587                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
2588                 .mode           = 0644,
2589                 .proc_handler   = perf_event_max_stack_handler,
2590                 .extra1         = SYSCTL_ZERO,
2591                 .extra2         = &six_hundred_forty_kb,
2592         },
2593         {
2594                 .procname       = "perf_event_max_contexts_per_stack",
2595                 .data           = &sysctl_perf_event_max_contexts_per_stack,
2596                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
2597                 .mode           = 0644,
2598                 .proc_handler   = perf_event_max_stack_handler,
2599                 .extra1         = SYSCTL_ZERO,
2600                 .extra2         = &one_thousand,
2601         },
2602 #endif
2603         {
2604                 .procname       = "panic_on_warn",
2605                 .data           = &panic_on_warn,
2606                 .maxlen         = sizeof(int),
2607                 .mode           = 0644,
2608                 .proc_handler   = proc_dointvec_minmax,
2609                 .extra1         = SYSCTL_ZERO,
2610                 .extra2         = SYSCTL_ONE,
2611         },
2612 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2613         {
2614                 .procname       = "timer_migration",
2615                 .data           = &sysctl_timer_migration,
2616                 .maxlen         = sizeof(unsigned int),
2617                 .mode           = 0644,
2618                 .proc_handler   = timer_migration_handler,
2619                 .extra1         = SYSCTL_ZERO,
2620                 .extra2         = SYSCTL_ONE,
2621         },
2622 #endif
2623 #ifdef CONFIG_BPF_SYSCALL
2624         {
2625                 .procname       = "unprivileged_bpf_disabled",
2626                 .data           = &sysctl_unprivileged_bpf_disabled,
2627                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
2628                 .mode           = 0644,
2629                 /* only handle a transition from default "0" to "1" */
2630                 .proc_handler   = proc_dointvec_minmax,
2631                 .extra1         = SYSCTL_ONE,
2632                 .extra2         = SYSCTL_ONE,
2633         },
2634         {
2635                 .procname       = "bpf_stats_enabled",
2636                 .data           = &bpf_stats_enabled_key.key,
2637                 .maxlen         = sizeof(bpf_stats_enabled_key),
2638                 .mode           = 0644,
2639                 .proc_handler   = bpf_stats_handler,
2640         },
2641 #endif
2642 #if defined(CONFIG_TREE_RCU)
2643         {
2644                 .procname       = "panic_on_rcu_stall",
2645                 .data           = &sysctl_panic_on_rcu_stall,
2646                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
2647                 .mode           = 0644,
2648                 .proc_handler   = proc_dointvec_minmax,
2649                 .extra1         = SYSCTL_ZERO,
2650                 .extra2         = SYSCTL_ONE,
2651         },
2652 #endif
2653 #if defined(CONFIG_TREE_RCU)
2654         {
2655                 .procname       = "max_rcu_stall_to_panic",
2656                 .data           = &sysctl_max_rcu_stall_to_panic,
2657                 .maxlen         = sizeof(sysctl_max_rcu_stall_to_panic),
2658                 .mode           = 0644,
2659                 .proc_handler   = proc_dointvec_minmax,
2660                 .extra1         = SYSCTL_ONE,
2661                 .extra2         = SYSCTL_INT_MAX,
2662         },
2663 #endif
2664 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2665         {
2666                 .procname       = "stack_erasing",
2667                 .data           = NULL,
2668                 .maxlen         = sizeof(int),
2669                 .mode           = 0600,
2670                 .proc_handler   = stack_erasing_sysctl,
2671                 .extra1         = SYSCTL_ZERO,
2672                 .extra2         = SYSCTL_ONE,
2673         },
2674 #endif
2675         { }
2676 };
2677
2678 static struct ctl_table vm_table[] = {
2679         {
2680                 .procname       = "overcommit_memory",
2681                 .data           = &sysctl_overcommit_memory,
2682                 .maxlen         = sizeof(sysctl_overcommit_memory),
2683                 .mode           = 0644,
2684                 .proc_handler   = overcommit_policy_handler,
2685                 .extra1         = SYSCTL_ZERO,
2686                 .extra2         = &two,
2687         },
2688         {
2689                 .procname       = "panic_on_oom",
2690                 .data           = &sysctl_panic_on_oom,
2691                 .maxlen         = sizeof(sysctl_panic_on_oom),
2692                 .mode           = 0644,
2693                 .proc_handler   = proc_dointvec_minmax,
2694                 .extra1         = SYSCTL_ZERO,
2695                 .extra2         = &two,
2696         },
2697         {
2698                 .procname       = "oom_kill_allocating_task",
2699                 .data           = &sysctl_oom_kill_allocating_task,
2700                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
2701                 .mode           = 0644,
2702                 .proc_handler   = proc_dointvec,
2703         },
2704         {
2705                 .procname       = "oom_dump_tasks",
2706                 .data           = &sysctl_oom_dump_tasks,
2707                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
2708                 .mode           = 0644,
2709                 .proc_handler   = proc_dointvec,
2710         },
2711         {
2712                 .procname       = "overcommit_ratio",
2713                 .data           = &sysctl_overcommit_ratio,
2714                 .maxlen         = sizeof(sysctl_overcommit_ratio),
2715                 .mode           = 0644,
2716                 .proc_handler   = overcommit_ratio_handler,
2717         },
2718         {
2719                 .procname       = "overcommit_kbytes",
2720                 .data           = &sysctl_overcommit_kbytes,
2721                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
2722                 .mode           = 0644,
2723                 .proc_handler   = overcommit_kbytes_handler,
2724         },
2725         {
2726                 .procname       = "page-cluster",
2727                 .data           = &page_cluster,
2728                 .maxlen         = sizeof(int),
2729                 .mode           = 0644,
2730                 .proc_handler   = proc_dointvec_minmax,
2731                 .extra1         = SYSCTL_ZERO,
2732         },
2733         {
2734                 .procname       = "dirty_background_ratio",
2735                 .data           = &dirty_background_ratio,
2736                 .maxlen         = sizeof(dirty_background_ratio),
2737                 .mode           = 0644,
2738                 .proc_handler   = dirty_background_ratio_handler,
2739                 .extra1         = SYSCTL_ZERO,
2740                 .extra2         = &one_hundred,
2741         },
2742         {
2743                 .procname       = "dirty_background_bytes",
2744                 .data           = &dirty_background_bytes,
2745                 .maxlen         = sizeof(dirty_background_bytes),
2746                 .mode           = 0644,
2747                 .proc_handler   = dirty_background_bytes_handler,
2748                 .extra1         = &one_ul,
2749         },
2750         {
2751                 .procname       = "dirty_ratio",
2752                 .data           = &vm_dirty_ratio,
2753                 .maxlen         = sizeof(vm_dirty_ratio),
2754                 .mode           = 0644,
2755                 .proc_handler   = dirty_ratio_handler,
2756                 .extra1         = SYSCTL_ZERO,
2757                 .extra2         = &one_hundred,
2758         },
2759         {
2760                 .procname       = "dirty_bytes",
2761                 .data           = &vm_dirty_bytes,
2762                 .maxlen         = sizeof(vm_dirty_bytes),
2763                 .mode           = 0644,
2764                 .proc_handler   = dirty_bytes_handler,
2765                 .extra1         = &dirty_bytes_min,
2766         },
2767         {
2768                 .procname       = "dirty_writeback_centisecs",
2769                 .data           = &dirty_writeback_interval,
2770                 .maxlen         = sizeof(dirty_writeback_interval),
2771                 .mode           = 0644,
2772                 .proc_handler   = dirty_writeback_centisecs_handler,
2773         },
2774         {
2775                 .procname       = "dirty_expire_centisecs",
2776                 .data           = &dirty_expire_interval,
2777                 .maxlen         = sizeof(dirty_expire_interval),
2778                 .mode           = 0644,
2779                 .proc_handler   = proc_dointvec_minmax,
2780                 .extra1         = SYSCTL_ZERO,
2781         },
2782         {
2783                 .procname       = "dirtytime_expire_seconds",
2784                 .data           = &dirtytime_expire_interval,
2785                 .maxlen         = sizeof(dirtytime_expire_interval),
2786                 .mode           = 0644,
2787                 .proc_handler   = dirtytime_interval_handler,
2788                 .extra1         = SYSCTL_ZERO,
2789         },
2790         {
2791                 .procname       = "swappiness",
2792                 .data           = &vm_swappiness,
2793                 .maxlen         = sizeof(vm_swappiness),
2794                 .mode           = 0644,
2795                 .proc_handler   = proc_dointvec_minmax,
2796                 .extra1         = SYSCTL_ZERO,
2797                 .extra2         = &two_hundred,
2798         },
2799 #ifdef CONFIG_HUGETLB_PAGE
2800         {
2801                 .procname       = "nr_hugepages",
2802                 .data           = NULL,
2803                 .maxlen         = sizeof(unsigned long),
2804                 .mode           = 0644,
2805                 .proc_handler   = hugetlb_sysctl_handler,
2806         },
2807 #ifdef CONFIG_NUMA
2808         {
2809                 .procname       = "nr_hugepages_mempolicy",
2810                 .data           = NULL,
2811                 .maxlen         = sizeof(unsigned long),
2812                 .mode           = 0644,
2813                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
2814         },
2815         {
2816                 .procname               = "numa_stat",
2817                 .data                   = &sysctl_vm_numa_stat,
2818                 .maxlen                 = sizeof(int),
2819                 .mode                   = 0644,
2820                 .proc_handler   = sysctl_vm_numa_stat_handler,
2821                 .extra1                 = SYSCTL_ZERO,
2822                 .extra2                 = SYSCTL_ONE,
2823         },
2824 #endif
2825          {
2826                 .procname       = "hugetlb_shm_group",
2827                 .data           = &sysctl_hugetlb_shm_group,
2828                 .maxlen         = sizeof(gid_t),
2829                 .mode           = 0644,
2830                 .proc_handler   = proc_dointvec,
2831          },
2832         {
2833                 .procname       = "nr_overcommit_hugepages",
2834                 .data           = NULL,
2835                 .maxlen         = sizeof(unsigned long),
2836                 .mode           = 0644,
2837                 .proc_handler   = hugetlb_overcommit_handler,
2838         },
2839 #endif
2840         {
2841                 .procname       = "lowmem_reserve_ratio",
2842                 .data           = &sysctl_lowmem_reserve_ratio,
2843                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
2844                 .mode           = 0644,
2845                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
2846         },
2847         {
2848                 .procname       = "drop_caches",
2849                 .data           = &sysctl_drop_caches,
2850                 .maxlen         = sizeof(int),
2851                 .mode           = 0200,
2852                 .proc_handler   = drop_caches_sysctl_handler,
2853                 .extra1         = SYSCTL_ONE,
2854                 .extra2         = &four,
2855         },
2856 #ifdef CONFIG_COMPACTION
2857         {
2858                 .procname       = "compact_memory",
2859                 .data           = &sysctl_compact_memory,
2860                 .maxlen         = sizeof(int),
2861                 .mode           = 0200,
2862                 .proc_handler   = sysctl_compaction_handler,
2863         },
2864         {
2865                 .procname       = "compaction_proactiveness",
2866                 .data           = &sysctl_compaction_proactiveness,
2867                 .maxlen         = sizeof(sysctl_compaction_proactiveness),
2868                 .mode           = 0644,
2869                 .proc_handler   = proc_dointvec_minmax,
2870                 .extra1         = SYSCTL_ZERO,
2871                 .extra2         = &one_hundred,
2872         },
2873         {
2874                 .procname       = "extfrag_threshold",
2875                 .data           = &sysctl_extfrag_threshold,
2876                 .maxlen         = sizeof(int),
2877                 .mode           = 0644,
2878                 .proc_handler   = proc_dointvec_minmax,
2879                 .extra1         = &min_extfrag_threshold,
2880                 .extra2         = &max_extfrag_threshold,
2881         },
2882         {
2883                 .procname       = "compact_unevictable_allowed",
2884                 .data           = &sysctl_compact_unevictable_allowed,
2885                 .maxlen         = sizeof(int),
2886                 .mode           = 0644,
2887                 .proc_handler   = proc_dointvec_minmax_warn_RT_change,
2888                 .extra1         = SYSCTL_ZERO,
2889                 .extra2         = SYSCTL_ONE,
2890         },
2891
2892 #endif /* CONFIG_COMPACTION */
2893         {
2894                 .procname       = "min_free_kbytes",
2895                 .data           = &min_free_kbytes,
2896                 .maxlen         = sizeof(min_free_kbytes),
2897                 .mode           = 0644,
2898                 .proc_handler   = min_free_kbytes_sysctl_handler,
2899                 .extra1         = SYSCTL_ZERO,
2900         },
2901         {
2902                 .procname       = "watermark_boost_factor",
2903                 .data           = &watermark_boost_factor,
2904                 .maxlen         = sizeof(watermark_boost_factor),
2905                 .mode           = 0644,
2906                 .proc_handler   = proc_dointvec_minmax,
2907                 .extra1         = SYSCTL_ZERO,
2908         },
2909         {
2910                 .procname       = "watermark_scale_factor",
2911                 .data           = &watermark_scale_factor,
2912                 .maxlen         = sizeof(watermark_scale_factor),
2913                 .mode           = 0644,
2914                 .proc_handler   = watermark_scale_factor_sysctl_handler,
2915                 .extra1         = SYSCTL_ONE,
2916                 .extra2         = &one_thousand,
2917         },
2918         {
2919                 .procname       = "percpu_pagelist_fraction",
2920                 .data           = &percpu_pagelist_fraction,
2921                 .maxlen         = sizeof(percpu_pagelist_fraction),
2922                 .mode           = 0644,
2923                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
2924                 .extra1         = SYSCTL_ZERO,
2925         },
2926         {
2927                 .procname       = "page_lock_unfairness",
2928                 .data           = &sysctl_page_lock_unfairness,
2929                 .maxlen         = sizeof(sysctl_page_lock_unfairness),
2930                 .mode           = 0644,
2931                 .proc_handler   = proc_dointvec_minmax,
2932                 .extra1         = SYSCTL_ZERO,
2933         },
2934 #ifdef CONFIG_MMU
2935         {
2936                 .procname       = "max_map_count",
2937                 .data           = &sysctl_max_map_count,
2938                 .maxlen         = sizeof(sysctl_max_map_count),
2939                 .mode           = 0644,
2940                 .proc_handler   = proc_dointvec_minmax,
2941                 .extra1         = SYSCTL_ZERO,
2942         },
2943 #else
2944         {
2945                 .procname       = "nr_trim_pages",
2946                 .data           = &sysctl_nr_trim_pages,
2947                 .maxlen         = sizeof(sysctl_nr_trim_pages),
2948                 .mode           = 0644,
2949                 .proc_handler   = proc_dointvec_minmax,
2950                 .extra1         = SYSCTL_ZERO,
2951         },
2952 #endif
2953         {
2954                 .procname       = "laptop_mode",
2955                 .data           = &laptop_mode,
2956                 .maxlen         = sizeof(laptop_mode),
2957                 .mode           = 0644,
2958                 .proc_handler   = proc_dointvec_jiffies,
2959         },
2960         {
2961                 .procname       = "block_dump",
2962                 .data           = &block_dump,
2963                 .maxlen         = sizeof(block_dump),
2964                 .mode           = 0644,
2965                 .proc_handler   = proc_dointvec_minmax,
2966                 .extra1         = SYSCTL_ZERO,
2967         },
2968         {
2969                 .procname       = "vfs_cache_pressure",
2970                 .data           = &sysctl_vfs_cache_pressure,
2971                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
2972                 .mode           = 0644,
2973                 .proc_handler   = proc_dointvec_minmax,
2974                 .extra1         = SYSCTL_ZERO,
2975         },
2976 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2977     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2978         {
2979                 .procname       = "legacy_va_layout",
2980                 .data           = &sysctl_legacy_va_layout,
2981                 .maxlen         = sizeof(sysctl_legacy_va_layout),
2982                 .mode           = 0644,
2983                 .proc_handler   = proc_dointvec_minmax,
2984                 .extra1         = SYSCTL_ZERO,
2985         },
2986 #endif
2987 #ifdef CONFIG_NUMA
2988         {
2989                 .procname       = "zone_reclaim_mode",
2990                 .data           = &node_reclaim_mode,
2991                 .maxlen         = sizeof(node_reclaim_mode),
2992                 .mode           = 0644,
2993                 .proc_handler   = proc_dointvec_minmax,
2994                 .extra1         = SYSCTL_ZERO,
2995         },
2996         {
2997                 .procname       = "min_unmapped_ratio",
2998                 .data           = &sysctl_min_unmapped_ratio,
2999                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
3000                 .mode           = 0644,
3001                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
3002                 .extra1         = SYSCTL_ZERO,
3003                 .extra2         = &one_hundred,
3004         },
3005         {
3006                 .procname       = "min_slab_ratio",
3007                 .data           = &sysctl_min_slab_ratio,
3008                 .maxlen         = sizeof(sysctl_min_slab_ratio),
3009                 .mode           = 0644,
3010                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
3011                 .extra1         = SYSCTL_ZERO,
3012                 .extra2         = &one_hundred,
3013         },
3014 #endif
3015 #ifdef CONFIG_SMP
3016         {
3017                 .procname       = "stat_interval",
3018                 .data           = &sysctl_stat_interval,
3019                 .maxlen         = sizeof(sysctl_stat_interval),
3020                 .mode           = 0644,
3021                 .proc_handler   = proc_dointvec_jiffies,
3022         },
3023         {
3024                 .procname       = "stat_refresh",
3025                 .data           = NULL,
3026                 .maxlen         = 0,
3027                 .mode           = 0600,
3028                 .proc_handler   = vmstat_refresh,
3029         },
3030 #endif
3031 #ifdef CONFIG_MMU
3032         {
3033                 .procname       = "mmap_min_addr",
3034                 .data           = &dac_mmap_min_addr,
3035                 .maxlen         = sizeof(unsigned long),
3036                 .mode           = 0644,
3037                 .proc_handler   = mmap_min_addr_handler,
3038         },
3039 #endif
3040 #ifdef CONFIG_NUMA
3041         {
3042                 .procname       = "numa_zonelist_order",
3043                 .data           = &numa_zonelist_order,
3044                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
3045                 .mode           = 0644,
3046                 .proc_handler   = numa_zonelist_order_handler,
3047         },
3048 #endif
3049 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
3050    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
3051         {
3052                 .procname       = "vdso_enabled",
3053 #ifdef CONFIG_X86_32
3054                 .data           = &vdso32_enabled,
3055                 .maxlen         = sizeof(vdso32_enabled),
3056 #else
3057                 .data           = &vdso_enabled,
3058                 .maxlen         = sizeof(vdso_enabled),
3059 #endif
3060                 .mode           = 0644,
3061                 .proc_handler   = proc_dointvec,
3062                 .extra1         = SYSCTL_ZERO,
3063         },
3064 #endif
3065 #ifdef CONFIG_HIGHMEM
3066         {
3067                 .procname       = "highmem_is_dirtyable",
3068                 .data           = &vm_highmem_is_dirtyable,
3069                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
3070                 .mode           = 0644,
3071                 .proc_handler   = proc_dointvec_minmax,
3072                 .extra1         = SYSCTL_ZERO,
3073                 .extra2         = SYSCTL_ONE,
3074         },
3075 #endif
3076 #ifdef CONFIG_MEMORY_FAILURE
3077         {
3078                 .procname       = "memory_failure_early_kill",
3079                 .data           = &sysctl_memory_failure_early_kill,
3080                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
3081                 .mode           = 0644,
3082                 .proc_handler   = proc_dointvec_minmax,
3083                 .extra1         = SYSCTL_ZERO,
3084                 .extra2         = SYSCTL_ONE,
3085         },
3086         {
3087                 .procname       = "memory_failure_recovery",
3088                 .data           = &sysctl_memory_failure_recovery,
3089                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
3090                 .mode           = 0644,
3091                 .proc_handler   = proc_dointvec_minmax,
3092                 .extra1         = SYSCTL_ZERO,
3093                 .extra2         = SYSCTL_ONE,
3094         },
3095 #endif
3096         {
3097                 .procname       = "user_reserve_kbytes",
3098                 .data           = &sysctl_user_reserve_kbytes,
3099                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
3100                 .mode           = 0644,
3101                 .proc_handler   = proc_doulongvec_minmax,
3102         },
3103         {
3104                 .procname       = "admin_reserve_kbytes",
3105                 .data           = &sysctl_admin_reserve_kbytes,
3106                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
3107                 .mode           = 0644,
3108                 .proc_handler   = proc_doulongvec_minmax,
3109         },
3110 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3111         {
3112                 .procname       = "mmap_rnd_bits",
3113                 .data           = &mmap_rnd_bits,
3114                 .maxlen         = sizeof(mmap_rnd_bits),
3115                 .mode           = 0600,
3116                 .proc_handler   = proc_dointvec_minmax,
3117                 .extra1         = (void *)&mmap_rnd_bits_min,
3118                 .extra2         = (void *)&mmap_rnd_bits_max,
3119         },
3120 #endif
3121 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3122         {
3123                 .procname       = "mmap_rnd_compat_bits",
3124                 .data           = &mmap_rnd_compat_bits,
3125                 .maxlen         = sizeof(mmap_rnd_compat_bits),
3126                 .mode           = 0600,
3127                 .proc_handler   = proc_dointvec_minmax,
3128                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
3129                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
3130         },
3131 #endif
3132 #ifdef CONFIG_USERFAULTFD
3133         {
3134                 .procname       = "unprivileged_userfaultfd",
3135                 .data           = &sysctl_unprivileged_userfaultfd,
3136                 .maxlen         = sizeof(sysctl_unprivileged_userfaultfd),
3137                 .mode           = 0644,
3138                 .proc_handler   = proc_dointvec_minmax,
3139                 .extra1         = SYSCTL_ZERO,
3140                 .extra2         = SYSCTL_ONE,
3141         },
3142 #endif
3143         { }
3144 };
3145
3146 static struct ctl_table fs_table[] = {
3147         {
3148                 .procname       = "inode-nr",
3149                 .data           = &inodes_stat,
3150                 .maxlen         = 2*sizeof(long),
3151                 .mode           = 0444,
3152                 .proc_handler   = proc_nr_inodes,
3153         },
3154         {
3155                 .procname       = "inode-state",
3156                 .data           = &inodes_stat,
3157                 .maxlen         = 7*sizeof(long),
3158                 .mode           = 0444,
3159                 .proc_handler   = proc_nr_inodes,
3160         },
3161         {
3162                 .procname       = "file-nr",
3163                 .data           = &files_stat,
3164                 .maxlen         = sizeof(files_stat),
3165                 .mode           = 0444,
3166                 .proc_handler   = proc_nr_files,
3167         },
3168         {
3169                 .procname       = "file-max",
3170                 .data           = &files_stat.max_files,
3171                 .maxlen         = sizeof(files_stat.max_files),
3172                 .mode           = 0644,
3173                 .proc_handler   = proc_doulongvec_minmax,
3174                 .extra1         = &zero_ul,
3175                 .extra2         = &long_max,
3176         },
3177         {
3178                 .procname       = "nr_open",
3179                 .data           = &sysctl_nr_open,
3180                 .maxlen         = sizeof(unsigned int),
3181                 .mode           = 0644,
3182                 .proc_handler   = proc_dointvec_minmax,
3183                 .extra1         = &sysctl_nr_open_min,
3184                 .extra2         = &sysctl_nr_open_max,
3185         },
3186         {
3187                 .procname       = "dentry-state",
3188                 .data           = &dentry_stat,
3189                 .maxlen         = 6*sizeof(long),
3190                 .mode           = 0444,
3191                 .proc_handler   = proc_nr_dentry,
3192         },
3193         {
3194                 .procname       = "overflowuid",
3195                 .data           = &fs_overflowuid,
3196                 .maxlen         = sizeof(int),
3197                 .mode           = 0644,
3198                 .proc_handler   = proc_dointvec_minmax,
3199                 .extra1         = &minolduid,
3200                 .extra2         = &maxolduid,
3201         },
3202         {
3203                 .procname       = "overflowgid",
3204                 .data           = &fs_overflowgid,
3205                 .maxlen         = sizeof(int),
3206                 .mode           = 0644,
3207                 .proc_handler   = proc_dointvec_minmax,
3208                 .extra1         = &minolduid,
3209                 .extra2         = &maxolduid,
3210         },
3211 #ifdef CONFIG_FILE_LOCKING
3212         {
3213                 .procname       = "leases-enable",
3214                 .data           = &leases_enable,
3215                 .maxlen         = sizeof(int),
3216                 .mode           = 0644,
3217                 .proc_handler   = proc_dointvec,
3218         },
3219 #endif
3220 #ifdef CONFIG_DNOTIFY
3221         {
3222                 .procname       = "dir-notify-enable",
3223                 .data           = &dir_notify_enable,
3224                 .maxlen         = sizeof(int),
3225                 .mode           = 0644,
3226                 .proc_handler   = proc_dointvec,
3227         },
3228 #endif
3229 #ifdef CONFIG_MMU
3230 #ifdef CONFIG_FILE_LOCKING
3231         {
3232                 .procname       = "lease-break-time",
3233                 .data           = &lease_break_time,
3234                 .maxlen         = sizeof(int),
3235                 .mode           = 0644,
3236                 .proc_handler   = proc_dointvec,
3237         },
3238 #endif
3239 #ifdef CONFIG_AIO
3240         {
3241                 .procname       = "aio-nr",
3242                 .data           = &aio_nr,
3243                 .maxlen         = sizeof(aio_nr),
3244                 .mode           = 0444,
3245                 .proc_handler   = proc_doulongvec_minmax,
3246         },
3247         {
3248                 .procname       = "aio-max-nr",
3249                 .data           = &aio_max_nr,
3250                 .maxlen         = sizeof(aio_max_nr),
3251                 .mode           = 0644,
3252                 .proc_handler   = proc_doulongvec_minmax,
3253         },
3254 #endif /* CONFIG_AIO */
3255 #ifdef CONFIG_INOTIFY_USER
3256         {
3257                 .procname       = "inotify",
3258                 .mode           = 0555,
3259                 .child          = inotify_table,
3260         },
3261 #endif
3262 #ifdef CONFIG_EPOLL
3263         {
3264                 .procname       = "epoll",
3265                 .mode           = 0555,
3266                 .child          = epoll_table,
3267         },
3268 #endif
3269 #endif
3270         {
3271                 .procname       = "protected_symlinks",
3272                 .data           = &sysctl_protected_symlinks,
3273                 .maxlen         = sizeof(int),
3274                 .mode           = 0600,
3275                 .proc_handler   = proc_dointvec_minmax,
3276                 .extra1         = SYSCTL_ZERO,
3277                 .extra2         = SYSCTL_ONE,
3278         },
3279         {
3280                 .procname       = "protected_hardlinks",
3281                 .data           = &sysctl_protected_hardlinks,
3282                 .maxlen         = sizeof(int),
3283                 .mode           = 0600,
3284                 .proc_handler   = proc_dointvec_minmax,
3285                 .extra1         = SYSCTL_ZERO,
3286                 .extra2         = SYSCTL_ONE,
3287         },
3288         {
3289                 .procname       = "protected_fifos",
3290                 .data           = &sysctl_protected_fifos,
3291                 .maxlen         = sizeof(int),
3292                 .mode           = 0600,
3293                 .proc_handler   = proc_dointvec_minmax,
3294                 .extra1         = SYSCTL_ZERO,
3295                 .extra2         = &two,
3296         },
3297         {
3298                 .procname       = "protected_regular",
3299                 .data           = &sysctl_protected_regular,
3300                 .maxlen         = sizeof(int),
3301                 .mode           = 0600,
3302                 .proc_handler   = proc_dointvec_minmax,
3303                 .extra1         = SYSCTL_ZERO,
3304                 .extra2         = &two,
3305         },
3306         {
3307                 .procname       = "suid_dumpable",
3308                 .data           = &suid_dumpable,
3309                 .maxlen         = sizeof(int),
3310                 .mode           = 0644,
3311                 .proc_handler   = proc_dointvec_minmax_coredump,
3312                 .extra1         = SYSCTL_ZERO,
3313                 .extra2         = &two,
3314         },
3315 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3316         {
3317                 .procname       = "binfmt_misc",
3318                 .mode           = 0555,
3319                 .child          = sysctl_mount_point,
3320         },
3321 #endif
3322         {
3323                 .procname       = "pipe-max-size",
3324                 .data           = &pipe_max_size,
3325                 .maxlen         = sizeof(pipe_max_size),
3326                 .mode           = 0644,
3327                 .proc_handler   = proc_dopipe_max_size,
3328         },
3329         {
3330                 .procname       = "pipe-user-pages-hard",
3331                 .data           = &pipe_user_pages_hard,
3332                 .maxlen         = sizeof(pipe_user_pages_hard),
3333                 .mode           = 0644,
3334                 .proc_handler   = proc_doulongvec_minmax,
3335         },
3336         {
3337                 .procname       = "pipe-user-pages-soft",
3338                 .data           = &pipe_user_pages_soft,
3339                 .maxlen         = sizeof(pipe_user_pages_soft),
3340                 .mode           = 0644,
3341                 .proc_handler   = proc_doulongvec_minmax,
3342         },
3343         {
3344                 .procname       = "mount-max",
3345                 .data           = &sysctl_mount_max,
3346                 .maxlen         = sizeof(unsigned int),
3347                 .mode           = 0644,
3348                 .proc_handler   = proc_dointvec_minmax,
3349                 .extra1         = SYSCTL_ONE,
3350         },
3351         { }
3352 };
3353
3354 static struct ctl_table debug_table[] = {
3355 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3356         {
3357                 .procname       = "exception-trace",
3358                 .data           = &show_unhandled_signals,
3359                 .maxlen         = sizeof(int),
3360                 .mode           = 0644,
3361                 .proc_handler   = proc_dointvec
3362         },
3363 #endif
3364 #if defined(CONFIG_OPTPROBES)
3365         {
3366                 .procname       = "kprobes-optimization",
3367                 .data           = &sysctl_kprobes_optimization,
3368                 .maxlen         = sizeof(int),
3369                 .mode           = 0644,
3370                 .proc_handler   = proc_kprobes_optimization_handler,
3371                 .extra1         = SYSCTL_ZERO,
3372                 .extra2         = SYSCTL_ONE,
3373         },
3374 #endif
3375         { }
3376 };
3377
3378 static struct ctl_table dev_table[] = {
3379         { }
3380 };
3381
3382 static struct ctl_table sysctl_base_table[] = {
3383         {
3384                 .procname       = "kernel",
3385                 .mode           = 0555,
3386                 .child          = kern_table,
3387         },
3388         {
3389                 .procname       = "vm",
3390                 .mode           = 0555,
3391                 .child          = vm_table,
3392         },
3393         {
3394                 .procname       = "fs",
3395                 .mode           = 0555,
3396                 .child          = fs_table,
3397         },
3398         {
3399                 .procname       = "debug",
3400                 .mode           = 0555,
3401                 .child          = debug_table,
3402         },
3403         {
3404                 .procname       = "dev",
3405                 .mode           = 0555,
3406                 .child          = dev_table,
3407         },
3408         { }
3409 };
3410
3411 int __init sysctl_init(void)
3412 {
3413         struct ctl_table_header *hdr;
3414
3415         hdr = register_sysctl_table(sysctl_base_table);
3416         kmemleak_not_leak(hdr);
3417         return 0;
3418 }
3419 #endif /* CONFIG_SYSCTL */
3420 /*
3421  * No sense putting this after each symbol definition, twice,
3422  * exception granted :-)
3423  */
3424 EXPORT_SYMBOL(proc_dointvec);
3425 EXPORT_SYMBOL(proc_douintvec);
3426 EXPORT_SYMBOL(proc_dointvec_jiffies);
3427 EXPORT_SYMBOL(proc_dointvec_minmax);
3428 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3429 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3430 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3431 EXPORT_SYMBOL(proc_dostring);
3432 EXPORT_SYMBOL(proc_doulongvec_minmax);
3433 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3434 EXPORT_SYMBOL(proc_do_large_bitmap);