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 one_thousand = 1000;
 122 #ifdef CONFIG_PRINTK
 123 static int ten_thousand = 10000;
 124 #endif
 125 #ifdef CONFIG_PERF_EVENTS
 126 static int six_hundred_forty_kb = 640 * 1024;
 127 #endif
 128
 129 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 130 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 131
 132 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 133 static int maxolduid = 65535;
 134 static int minolduid;
 135
 136 static int ngroups_max = NGROUPS_MAX;
 137 static const int cap_last_cap = CAP_LAST_CAP;
 138
 139 /*
 140  * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
 141  * and hung_task_check_interval_secs
 142  */
 143 #ifdef CONFIG_DETECT_HUNG_TASK
 144 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 145 #endif
 146
 147 #ifdef CONFIG_INOTIFY_USER
 148 #include <linux/inotify.h>
 149 #endif
 150
 151 #ifdef CONFIG_PROC_SYSCTL
 152
 153 /**
 154  * enum sysctl_writes_mode - supported sysctl write modes
 155  *
 156  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 157  *      to be written, and multiple writes on the same sysctl file descriptor
 158  *      will rewrite the sysctl value, regardless of file position. No warning
 159  *      is issued when the initial position is not 0.
 160  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 161  *      not 0.
 162  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 163  *      file position 0 and the value must be fully contained in the buffer
 164  *      sent to the write syscall. If dealing with strings respect the file
 165  *      position, but restrict this to the max length of the buffer, anything
 166  *      passed the max length will be ignored. Multiple writes will append
 167  *      to the buffer.
 168  *
 169  * These write modes control how current file position affects the behavior of
 170  * updating sysctl values through the proc interface on each write.
 171  */
 172 enum sysctl_writes_mode {
 173         SYSCTL_WRITES_LEGACY            = -1,
 174         SYSCTL_WRITES_WARN              = 0,
 175         SYSCTL_WRITES_STRICT            = 1,
 176 };
 177
 178 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 179 #endif /* CONFIG_PROC_SYSCTL */
 180
 181 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
 182     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
 183 int sysctl_legacy_va_layout;
 184 #endif
 185
 186 #ifdef CONFIG_SCHED_DEBUG
 187 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 188 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 189 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 190 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 191 #ifdef CONFIG_SMP
 192 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 193 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 194 #endif /* CONFIG_SMP */
 195 #endif /* CONFIG_SCHED_DEBUG */
 196
 197 #ifdef CONFIG_COMPACTION
 198 static int min_extfrag_threshold;
 199 static int max_extfrag_threshold = 1000;
 200 #endif
 201
 202 #endif /* CONFIG_SYSCTL */
 203
 204 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
 205 static int bpf_stats_handler(struct ctl_table *table, int write,
 206                              void __user *buffer, size_t *lenp,
 207                              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                 /*
 869                  * Poor man's atomic or. Not worth adding a primitive
 870                  * to everyone's atomic.h for this
 871                  */
 872                 int i;
 873                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
 874                         if ((tmptaint >> i) & 1)
 875                                 add_taint(i, LOCKDEP_STILL_OK);
 876                 }
 877         }
 878
 879         return err;
 880 }
 881
 882 #ifdef CONFIG_PRINTK
 883 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 884                                 void *buffer, size_t *lenp, loff_t *ppos)
 885 {
 886         if (write && !capable(CAP_SYS_ADMIN))
 887                 return -EPERM;
 888
 889         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 890 }
 891 #endif
 892
 893 /**
 894  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
 895  * @min: pointer to minimum allowable value
 896  * @max: pointer to maximum allowable value
 897  *
 898  * The do_proc_dointvec_minmax_conv_param structure provides the
 899  * minimum and maximum values for doing range checking for those sysctl
 900  * parameters that use the proc_dointvec_minmax() handler.
 901  */
 902 struct do_proc_dointvec_minmax_conv_param {
 903         int *min;
 904         int *max;
 905 };
 906
 907 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
 908                                         int *valp,
 909                                         int write, void *data)
 910 {
 911         int tmp, ret;
 912         struct do_proc_dointvec_minmax_conv_param *param = data;
 913         /*
 914          * If writing, first do so via a temporary local int so we can
 915          * bounds-check it before touching *valp.
 916          */
 917         int *ip = write ? &tmp : valp;
 918
 919         ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
 920         if (ret)
 921                 return ret;
 922
 923         if (write) {
 924                 if ((param->min && *param->min > tmp) ||
 925                     (param->max && *param->max < tmp))
 926                         return -EINVAL;
 927                 *valp = tmp;
 928         }
 929
 930         return 0;
 931 }
 932
 933 /**
 934  * proc_dointvec_minmax - read a vector of integers with min/max values
 935  * @table: the sysctl table
 936  * @write: %TRUE if this is a write to the sysctl file
 937  * @buffer: the user buffer
 938  * @lenp: the size of the user buffer
 939  * @ppos: file position
 940  *
 941  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 942  * values from/to the user buffer, treated as an ASCII string.
 943  *
 944  * This routine will ensure the values are within the range specified by
 945  * table->extra1 (min) and table->extra2 (max).
 946  *
 947  * Returns 0 on success or -EINVAL on write when the range check fails.
 948  */
 949 int proc_dointvec_minmax(struct ctl_table *table, int write,
 950                   void *buffer, size_t *lenp, loff_t *ppos)
 951 {
 952         struct do_proc_dointvec_minmax_conv_param param = {
 953                 .min = (int *) table->extra1,
 954                 .max = (int *) table->extra2,
 955         };
 956         return do_proc_dointvec(table, write, buffer, lenp, ppos,
 957                                 do_proc_dointvec_minmax_conv, &param);
 958 }
 959
 960 /**
 961  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
 962  * @min: pointer to minimum allowable value
 963  * @max: pointer to maximum allowable value
 964  *
 965  * The do_proc_douintvec_minmax_conv_param structure provides the
 966  * minimum and maximum values for doing range checking for those sysctl
 967  * parameters that use the proc_douintvec_minmax() handler.
 968  */
 969 struct do_proc_douintvec_minmax_conv_param {
 970         unsigned int *min;
 971         unsigned int *max;
 972 };
 973
 974 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
 975                                          unsigned int *valp,
 976                                          int write, void *data)
 977 {
 978         int ret;
 979         unsigned int tmp;
 980         struct do_proc_douintvec_minmax_conv_param *param = data;
 981         /* write via temporary local uint for bounds-checking */
 982         unsigned int *up = write ? &tmp : valp;
 983
 984         ret = do_proc_douintvec_conv(lvalp, up, write, data);
 985         if (ret)
 986                 return ret;
 987
 988         if (write) {
 989                 if ((param->min && *param->min > tmp) ||
 990                     (param->max && *param->max < tmp))
 991                         return -ERANGE;
 992
 993                 *valp = tmp;
 994         }
 995
 996         return 0;
 997 }
 998
 999 /**
1000  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1001  * @table: the sysctl table
1002  * @write: %TRUE if this is a write to the sysctl file
1003  * @buffer: the user buffer
1004  * @lenp: the size of the user buffer
1005  * @ppos: file position
1006  *
1007  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1008  * values from/to the user buffer, treated as an ASCII string. Negative
1009  * strings are not allowed.
1010  *
1011  * This routine will ensure the values are within the range specified by
1012  * table->extra1 (min) and table->extra2 (max). There is a final sanity
1013  * check for UINT_MAX to avoid having to support wrap around uses from
1014  * userspace.
1015  *
1016  * Returns 0 on success or -ERANGE on write when the range check fails.
1017  */
1018 int proc_douintvec_minmax(struct ctl_table *table, int write,
1019                           void *buffer, size_t *lenp, loff_t *ppos)
1020 {
1021         struct do_proc_douintvec_minmax_conv_param param = {
1022                 .min = (unsigned int *) table->extra1,
1023                 .max = (unsigned int *) table->extra2,
1024         };
1025         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1026                                  do_proc_douintvec_minmax_conv, &param);
1027 }
1028
1029 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1030                                         unsigned int *valp,
1031                                         int write, void *data)
1032 {
1033         if (write) {
1034                 unsigned int val;
1035
1036                 val = round_pipe_size(*lvalp);
1037                 if (val == 0)
1038                         return -EINVAL;
1039
1040                 *valp = val;
1041         } else {
1042                 unsigned int val = *valp;
1043                 *lvalp = (unsigned long) val;
1044         }
1045
1046         return 0;
1047 }
1048
1049 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1050                                 void *buffer, size_t *lenp, loff_t *ppos)
1051 {
1052         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1053                                  do_proc_dopipe_max_size_conv, NULL);
1054 }
1055
1056 static void validate_coredump_safety(void)
1057 {
1058 #ifdef CONFIG_COREDUMP
1059         if (suid_dumpable == SUID_DUMP_ROOT &&
1060             core_pattern[0] != '/' && core_pattern[0] != '|') {
1061                 printk(KERN_WARNING
1062 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1063 "Pipe handler or fully qualified core dump path required.\n"
1064 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1065                 );
1066         }
1067 #endif
1068 }
1069
1070 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1071                 void *buffer, size_t *lenp, loff_t *ppos)
1072 {
1073         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1074         if (!error)
1075                 validate_coredump_safety();
1076         return error;
1077 }
1078
1079 #ifdef CONFIG_COREDUMP
1080 static int proc_dostring_coredump(struct ctl_table *table, int write,
1081                   void *buffer, size_t *lenp, loff_t *ppos)
1082 {
1083         int error = proc_dostring(table, write, buffer, lenp, ppos);
1084         if (!error)
1085                 validate_coredump_safety();
1086         return error;
1087 }
1088 #endif
1089
1090 #ifdef CONFIG_MAGIC_SYSRQ
1091 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1092                                 void *buffer, size_t *lenp, loff_t *ppos)
1093 {
1094         int tmp, ret;
1095
1096         tmp = sysrq_mask();
1097
1098         ret = __do_proc_dointvec(&tmp, table, write, buffer,
1099                                lenp, ppos, NULL, NULL);
1100         if (ret || !write)
1101                 return ret;
1102
1103         if (write)
1104                 sysrq_toggle_support(tmp);
1105
1106         return 0;
1107 }
1108 #endif
1109
1110 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1111                 int write, void *buffer, size_t *lenp, loff_t *ppos,
1112                 unsigned long convmul, unsigned long convdiv)
1113 {
1114         unsigned long *i, *min, *max;
1115         int vleft, first = 1, err = 0;
1116         size_t left;
1117         char *p;
1118
1119         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1120                 *lenp = 0;
1121                 return 0;
1122         }
1123
1124         i = (unsigned long *) data;
1125         min = (unsigned long *) table->extra1;
1126         max = (unsigned long *) table->extra2;
1127         vleft = table->maxlen / sizeof(unsigned long);
1128         left = *lenp;
1129
1130         if (write) {
1131                 if (proc_first_pos_non_zero_ignore(ppos, table))
1132                         goto out;
1133
1134                 if (left > PAGE_SIZE - 1)
1135                         left = PAGE_SIZE - 1;
1136                 p = buffer;
1137         }
1138
1139         for (; left && vleft--; i++, first = 0) {
1140                 unsigned long val;
1141
1142                 if (write) {
1143                         bool neg;
1144
1145                         left -= proc_skip_spaces(&p);
1146                         if (!left)
1147                                 break;
1148
1149                         err = proc_get_long(&p, &left, &val, &neg,
1150                                              proc_wspace_sep,
1151                                              sizeof(proc_wspace_sep), NULL);
1152                         if (err)
1153                                 break;
1154                         if (neg)
1155                                 continue;
1156                         val = convmul * val / convdiv;
1157                         if ((min && val < *min) || (max && val > *max)) {
1158                                 err = -EINVAL;
1159                                 break;
1160                         }
1161                         *i = val;
1162                 } else {
1163                         val = convdiv * (*i) / convmul;
1164                         if (!first)
1165                                 proc_put_char(&buffer, &left, '\t');
1166                         proc_put_long(&buffer, &left, val, false);
1167                 }
1168         }
1169
1170         if (!write && !first && left && !err)
1171                 proc_put_char(&buffer, &left, '\n');
1172         if (write && !err)
1173                 left -= proc_skip_spaces(&p);
1174         if (write && first)
1175                 return err ? : -EINVAL;
1176         *lenp -= left;
1177 out:
1178         *ppos += *lenp;
1179         return err;
1180 }
1181
1182 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1183                 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1184                 unsigned long convdiv)
1185 {
1186         return __do_proc_doulongvec_minmax(table->data, table, write,
1187                         buffer, lenp, ppos, convmul, convdiv);
1188 }
1189
1190 /**
1191  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1192  * @table: the sysctl table
1193  * @write: %TRUE if this is a write to the sysctl file
1194  * @buffer: the user buffer
1195  * @lenp: the size of the user buffer
1196  * @ppos: file position
1197  *
1198  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1199  * values from/to the user buffer, treated as an ASCII string.
1200  *
1201  * This routine will ensure the values are within the range specified by
1202  * table->extra1 (min) and table->extra2 (max).
1203  *
1204  * Returns 0 on success.
1205  */
1206 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1207                            void *buffer, size_t *lenp, loff_t *ppos)
1208 {
1209     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1210 }
1211
1212 /**
1213  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1214  * @table: the sysctl table
1215  * @write: %TRUE if this is a write to the sysctl file
1216  * @buffer: the user buffer
1217  * @lenp: the size of the user buffer
1218  * @ppos: file position
1219  *
1220  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1221  * values from/to the user buffer, treated as an ASCII string. The values
1222  * are treated as milliseconds, and converted to jiffies when they are stored.
1223  *
1224  * This routine will ensure the values are within the range specified by
1225  * table->extra1 (min) and table->extra2 (max).
1226  *
1227  * Returns 0 on success.
1228  */
1229 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1230                                       void *buffer, size_t *lenp, loff_t *ppos)
1231 {
1232     return do_proc_doulongvec_minmax(table, write, buffer,
1233                                      lenp, ppos, HZ, 1000l);
1234 }
1235
1236
1237 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1238                                          int *valp,
1239                                          int write, void *data)
1240 {
1241         if (write) {
1242                 if (*lvalp > INT_MAX / HZ)
1243                         return 1;
1244                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1245         } else {
1246                 int val = *valp;
1247                 unsigned long lval;
1248                 if (val < 0) {
1249                         *negp = true;
1250                         lval = -(unsigned long)val;
1251                 } else {
1252                         *negp = false;
1253                         lval = (unsigned long)val;
1254                 }
1255                 *lvalp = lval / HZ;
1256         }
1257         return 0;
1258 }
1259
1260 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1261                                                 int *valp,
1262                                                 int write, void *data)
1263 {
1264         if (write) {
1265                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1266                         return 1;
1267                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1268         } else {
1269                 int val = *valp;
1270                 unsigned long lval;
1271                 if (val < 0) {
1272                         *negp = true;
1273                         lval = -(unsigned long)val;
1274                 } else {
1275                         *negp = false;
1276                         lval = (unsigned long)val;
1277                 }
1278                 *lvalp = jiffies_to_clock_t(lval);
1279         }
1280         return 0;
1281 }
1282
1283 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1284                                             int *valp,
1285                                             int write, void *data)
1286 {
1287         if (write) {
1288                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1289
1290                 if (jif > INT_MAX)
1291                         return 1;
1292                 *valp = (int)jif;
1293         } else {
1294                 int val = *valp;
1295                 unsigned long lval;
1296                 if (val < 0) {
1297                         *negp = true;
1298                         lval = -(unsigned long)val;
1299                 } else {
1300                         *negp = false;
1301                         lval = (unsigned long)val;
1302                 }
1303                 *lvalp = jiffies_to_msecs(lval);
1304         }
1305         return 0;
1306 }
1307
1308 /**
1309  * proc_dointvec_jiffies - read a vector of integers as seconds
1310  * @table: the sysctl table
1311  * @write: %TRUE if this is a write to the sysctl file
1312  * @buffer: the user buffer
1313  * @lenp: the size of the user buffer
1314  * @ppos: file position
1315  *
1316  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1317  * values from/to the user buffer, treated as an ASCII string.
1318  * The values read are assumed to be in seconds, and are converted into
1319  * jiffies.
1320  *
1321  * Returns 0 on success.
1322  */
1323 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1324                           void *buffer, size_t *lenp, loff_t *ppos)
1325 {
1326     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1327                             do_proc_dointvec_jiffies_conv,NULL);
1328 }
1329
1330 /**
1331  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1332  * @table: the sysctl table
1333  * @write: %TRUE if this is a write to the sysctl file
1334  * @buffer: the user buffer
1335  * @lenp: the size of the user buffer
1336  * @ppos: pointer to the file position
1337  *
1338  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1339  * values from/to the user buffer, treated as an ASCII string.
1340  * The values read are assumed to be in 1/USER_HZ seconds, and
1341  * are converted into jiffies.
1342  *
1343  * Returns 0 on success.
1344  */
1345 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1346                                  void *buffer, size_t *lenp, loff_t *ppos)
1347 {
1348     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1349                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1350 }
1351
1352 /**
1353  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1354  * @table: the sysctl table
1355  * @write: %TRUE if this is a write to the sysctl file
1356  * @buffer: the user buffer
1357  * @lenp: the size of the user buffer
1358  * @ppos: file position
1359  * @ppos: the current position in the file
1360  *
1361  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1362  * values from/to the user buffer, treated as an ASCII string.
1363  * The values read are assumed to be in 1/1000 seconds, and
1364  * are converted into jiffies.
1365  *
1366  * Returns 0 on success.
1367  */
1368 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1369                 size_t *lenp, loff_t *ppos)
1370 {
1371         return do_proc_dointvec(table, write, buffer, lenp, ppos,
1372                                 do_proc_dointvec_ms_jiffies_conv, NULL);
1373 }
1374
1375 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1376                 size_t *lenp, loff_t *ppos)
1377 {
1378         struct pid *new_pid;
1379         pid_t tmp;
1380         int r;
1381
1382         tmp = pid_vnr(cad_pid);
1383
1384         r = __do_proc_dointvec(&tmp, table, write, buffer,
1385                                lenp, ppos, NULL, NULL);
1386         if (r || !write)
1387                 return r;
1388
1389         new_pid = find_get_pid(tmp);
1390         if (!new_pid)
1391                 return -ESRCH;
1392
1393         put_pid(xchg(&cad_pid, new_pid));
1394         return 0;
1395 }
1396
1397 /**
1398  * proc_do_large_bitmap - read/write from/to a large bitmap
1399  * @table: the sysctl table
1400  * @write: %TRUE if this is a write to the sysctl file
1401  * @buffer: the user buffer
1402  * @lenp: the size of the user buffer
1403  * @ppos: file position
1404  *
1405  * The bitmap is stored at table->data and the bitmap length (in bits)
1406  * in table->maxlen.
1407  *
1408  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1409  * large bitmaps may be represented in a compact manner. Writing into
1410  * the file will clear the bitmap then update it with the given input.
1411  *
1412  * Returns 0 on success.
1413  */
1414 int proc_do_large_bitmap(struct ctl_table *table, int write,
1415                          void *buffer, size_t *lenp, loff_t *ppos)
1416 {
1417         int err = 0;
1418         bool first = 1;
1419         size_t left = *lenp;
1420         unsigned long bitmap_len = table->maxlen;
1421         unsigned long *bitmap = *(unsigned long **) table->data;
1422         unsigned long *tmp_bitmap = NULL;
1423         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1424
1425         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1426                 *lenp = 0;
1427                 return 0;
1428         }
1429
1430         if (write) {
1431                 char *p = buffer;
1432                 size_t skipped = 0;
1433
1434                 if (left > PAGE_SIZE - 1) {
1435                         left = PAGE_SIZE - 1;
1436                         /* How much of the buffer we'll skip this pass */
1437                         skipped = *lenp - left;
1438                 }
1439
1440                 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1441                 if (!tmp_bitmap)
1442                         return -ENOMEM;
1443                 proc_skip_char(&p, &left, '\n');
1444                 while (!err && left) {
1445                         unsigned long val_a, val_b;
1446                         bool neg;
1447                         size_t saved_left;
1448
1449                         /* In case we stop parsing mid-number, we can reset */
1450                         saved_left = left;
1451                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1452                                              sizeof(tr_a), &c);
1453                         /*
1454                          * If we consumed the entirety of a truncated buffer or
1455                          * only one char is left (may be a "-"), then stop here,
1456                          * reset, & come back for more.
1457                          */
1458                         if ((left <= 1) && skipped) {
1459                                 left = saved_left;
1460                                 break;
1461                         }
1462
1463                         if (err)
1464                                 break;
1465                         if (val_a >= bitmap_len || neg) {
1466                                 err = -EINVAL;
1467                                 break;
1468                         }
1469
1470                         val_b = val_a;
1471                         if (left) {
1472                                 p++;
1473                                 left--;
1474                         }
1475
1476                         if (c == '-') {
1477                                 err = proc_get_long(&p, &left, &val_b,
1478                                                      &neg, tr_b, sizeof(tr_b),
1479                                                      &c);
1480                                 /*
1481                                  * If we consumed all of a truncated buffer or
1482                                  * then stop here, reset, & come back for more.
1483                                  */
1484                                 if (!left && skipped) {
1485                                         left = saved_left;
1486                                         break;
1487                                 }
1488
1489                                 if (err)
1490                                         break;
1491                                 if (val_b >= bitmap_len || neg ||
1492                                     val_a > val_b) {
1493                                         err = -EINVAL;
1494                                         break;
1495                                 }
1496                                 if (left) {
1497                                         p++;
1498                                         left--;
1499                                 }
1500                         }
1501
1502                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1503                         first = 0;
1504                         proc_skip_char(&p, &left, '\n');
1505                 }
1506                 left += skipped;
1507         } else {
1508                 unsigned long bit_a, bit_b = 0;
1509
1510                 while (left) {
1511                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1512                         if (bit_a >= bitmap_len)
1513                                 break;
1514                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
1515                                                    bit_a + 1) - 1;
1516
1517                         if (!first)
1518                                 proc_put_char(&buffer, &left, ',');
1519                         proc_put_long(&buffer, &left, bit_a, false);
1520                         if (bit_a != bit_b) {
1521                                 proc_put_char(&buffer, &left, '-');
1522                                 proc_put_long(&buffer, &left, bit_b, false);
1523                         }
1524
1525                         first = 0; bit_b++;
1526                 }
1527                 proc_put_char(&buffer, &left, '\n');
1528         }
1529
1530         if (!err) {
1531                 if (write) {
1532                         if (*ppos)
1533                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1534                         else
1535                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1536                 }
1537                 *lenp -= left;
1538                 *ppos += *lenp;
1539         }
1540
1541         bitmap_free(tmp_bitmap);
1542         return err;
1543 }
1544
1545 #else /* CONFIG_PROC_SYSCTL */
1546
1547 int proc_dostring(struct ctl_table *table, int write,
1548                   void *buffer, size_t *lenp, loff_t *ppos)
1549 {
1550         return -ENOSYS;
1551 }
1552
1553 int proc_dointvec(struct ctl_table *table, int write,
1554                   void *buffer, size_t *lenp, loff_t *ppos)
1555 {
1556         return -ENOSYS;
1557 }
1558
1559 int proc_douintvec(struct ctl_table *table, int write,
1560                   void *buffer, size_t *lenp, loff_t *ppos)
1561 {
1562         return -ENOSYS;
1563 }
1564
1565 int proc_dointvec_minmax(struct ctl_table *table, int write,
1566                     void *buffer, size_t *lenp, loff_t *ppos)
1567 {
1568         return -ENOSYS;
1569 }
1570
1571 int proc_douintvec_minmax(struct ctl_table *table, int write,
1572                           void *buffer, size_t *lenp, loff_t *ppos)
1573 {
1574         return -ENOSYS;
1575 }
1576
1577 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1578                     void *buffer, size_t *lenp, loff_t *ppos)
1579 {
1580         return -ENOSYS;
1581 }
1582
1583 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1584                     void *buffer, size_t *lenp, loff_t *ppos)
1585 {
1586         return -ENOSYS;
1587 }
1588
1589 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1590                              void *buffer, size_t *lenp, loff_t *ppos)
1591 {
1592         return -ENOSYS;
1593 }
1594
1595 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1596                     void *buffer, size_t *lenp, loff_t *ppos)
1597 {
1598         return -ENOSYS;
1599 }
1600
1601 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1602                                       void *buffer, size_t *lenp, loff_t *ppos)
1603 {
1604         return -ENOSYS;
1605 }
1606
1607 int proc_do_large_bitmap(struct ctl_table *table, int write,
1608                          void *buffer, size_t *lenp, loff_t *ppos)
1609 {
1610         return -ENOSYS;
1611 }
1612
1613 #endif /* CONFIG_PROC_SYSCTL */
1614
1615 #if defined(CONFIG_SYSCTL)
1616 int proc_do_static_key(struct ctl_table *table, int write,
1617                        void *buffer, size_t *lenp, loff_t *ppos)
1618 {
1619         struct static_key *key = (struct static_key *)table->data;
1620         static DEFINE_MUTEX(static_key_mutex);
1621         int val, ret;
1622         struct ctl_table tmp = {
1623                 .data   = &val,
1624                 .maxlen = sizeof(val),
1625                 .mode   = table->mode,
1626                 .extra1 = SYSCTL_ZERO,
1627                 .extra2 = SYSCTL_ONE,
1628         };
1629
1630         if (write && !capable(CAP_SYS_ADMIN))
1631                 return -EPERM;
1632
1633         mutex_lock(&static_key_mutex);
1634         val = static_key_enabled(key);
1635         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1636         if (write && !ret) {
1637                 if (val)
1638                         static_key_enable(key);
1639                 else
1640                         static_key_disable(key);
1641         }
1642         mutex_unlock(&static_key_mutex);
1643         return ret;
1644 }
1645
1646 static struct ctl_table kern_table[] = {
1647         {
1648                 .procname       = "sched_child_runs_first",
1649                 .data           = &sysctl_sched_child_runs_first,
1650                 .maxlen         = sizeof(unsigned int),
1651                 .mode           = 0644,
1652                 .proc_handler   = proc_dointvec,
1653         },
1654 #ifdef CONFIG_SCHED_DEBUG
1655         {
1656                 .procname       = "sched_min_granularity_ns",
1657                 .data           = &sysctl_sched_min_granularity,
1658                 .maxlen         = sizeof(unsigned int),
1659                 .mode           = 0644,
1660                 .proc_handler   = sched_proc_update_handler,
1661                 .extra1         = &min_sched_granularity_ns,
1662                 .extra2         = &max_sched_granularity_ns,
1663         },
1664         {
1665                 .procname       = "sched_latency_ns",
1666                 .data           = &sysctl_sched_latency,
1667                 .maxlen         = sizeof(unsigned int),
1668                 .mode           = 0644,
1669                 .proc_handler   = sched_proc_update_handler,
1670                 .extra1         = &min_sched_granularity_ns,
1671                 .extra2         = &max_sched_granularity_ns,
1672         },
1673         {
1674                 .procname       = "sched_wakeup_granularity_ns",
1675                 .data           = &sysctl_sched_wakeup_granularity,
1676                 .maxlen         = sizeof(unsigned int),
1677                 .mode           = 0644,
1678                 .proc_handler   = sched_proc_update_handler,
1679                 .extra1         = &min_wakeup_granularity_ns,
1680                 .extra2         = &max_wakeup_granularity_ns,
1681         },
1682 #ifdef CONFIG_SMP
1683         {
1684                 .procname       = "sched_tunable_scaling",
1685                 .data           = &sysctl_sched_tunable_scaling,
1686                 .maxlen         = sizeof(enum sched_tunable_scaling),
1687                 .mode           = 0644,
1688                 .proc_handler   = sched_proc_update_handler,
1689                 .extra1         = &min_sched_tunable_scaling,
1690                 .extra2         = &max_sched_tunable_scaling,
1691         },
1692         {
1693                 .procname       = "sched_migration_cost_ns",
1694                 .data           = &sysctl_sched_migration_cost,
1695                 .maxlen         = sizeof(unsigned int),
1696                 .mode           = 0644,
1697                 .proc_handler   = proc_dointvec,
1698         },
1699         {
1700                 .procname       = "sched_nr_migrate",
1701                 .data           = &sysctl_sched_nr_migrate,
1702                 .maxlen         = sizeof(unsigned int),
1703                 .mode           = 0644,
1704                 .proc_handler   = proc_dointvec,
1705         },
1706 #ifdef CONFIG_SCHEDSTATS
1707         {
1708                 .procname       = "sched_schedstats",
1709                 .data           = NULL,
1710                 .maxlen         = sizeof(unsigned int),
1711                 .mode           = 0644,
1712                 .proc_handler   = sysctl_schedstats,
1713                 .extra1         = SYSCTL_ZERO,
1714                 .extra2         = SYSCTL_ONE,
1715         },
1716 #endif /* CONFIG_SCHEDSTATS */
1717 #endif /* CONFIG_SMP */
1718 #ifdef CONFIG_NUMA_BALANCING
1719         {
1720                 .procname       = "numa_balancing_scan_delay_ms",
1721                 .data           = &sysctl_numa_balancing_scan_delay,
1722                 .maxlen         = sizeof(unsigned int),
1723                 .mode           = 0644,
1724                 .proc_handler   = proc_dointvec,
1725         },
1726         {
1727                 .procname       = "numa_balancing_scan_period_min_ms",
1728                 .data           = &sysctl_numa_balancing_scan_period_min,
1729                 .maxlen         = sizeof(unsigned int),
1730                 .mode           = 0644,
1731                 .proc_handler   = proc_dointvec,
1732         },
1733         {
1734                 .procname       = "numa_balancing_scan_period_max_ms",
1735                 .data           = &sysctl_numa_balancing_scan_period_max,
1736                 .maxlen         = sizeof(unsigned int),
1737                 .mode           = 0644,
1738                 .proc_handler   = proc_dointvec,
1739         },
1740         {
1741                 .procname       = "numa_balancing_scan_size_mb",
1742                 .data           = &sysctl_numa_balancing_scan_size,
1743                 .maxlen         = sizeof(unsigned int),
1744                 .mode           = 0644,
1745                 .proc_handler   = proc_dointvec_minmax,
1746                 .extra1         = SYSCTL_ONE,
1747         },
1748         {
1749                 .procname       = "numa_balancing",
1750                 .data           = NULL, /* filled in by handler */
1751                 .maxlen         = sizeof(unsigned int),
1752                 .mode           = 0644,
1753                 .proc_handler   = sysctl_numa_balancing,
1754                 .extra1         = SYSCTL_ZERO,
1755                 .extra2         = SYSCTL_ONE,
1756         },
1757 #endif /* CONFIG_NUMA_BALANCING */
1758 #endif /* CONFIG_SCHED_DEBUG */
1759         {
1760                 .procname       = "sched_rt_period_us",
1761                 .data           = &sysctl_sched_rt_period,
1762                 .maxlen         = sizeof(unsigned int),
1763                 .mode           = 0644,
1764                 .proc_handler   = sched_rt_handler,
1765         },
1766         {
1767                 .procname       = "sched_rt_runtime_us",
1768                 .data           = &sysctl_sched_rt_runtime,
1769                 .maxlen         = sizeof(int),
1770                 .mode           = 0644,
1771                 .proc_handler   = sched_rt_handler,
1772         },
1773         {
1774                 .procname       = "sched_rr_timeslice_ms",
1775                 .data           = &sysctl_sched_rr_timeslice,
1776                 .maxlen         = sizeof(int),
1777                 .mode           = 0644,
1778                 .proc_handler   = sched_rr_handler,
1779         },
1780 #ifdef CONFIG_UCLAMP_TASK
1781         {
1782                 .procname       = "sched_util_clamp_min",
1783                 .data           = &sysctl_sched_uclamp_util_min,
1784                 .maxlen         = sizeof(unsigned int),
1785                 .mode           = 0644,
1786                 .proc_handler   = sysctl_sched_uclamp_handler,
1787         },
1788         {
1789                 .procname       = "sched_util_clamp_max",
1790                 .data           = &sysctl_sched_uclamp_util_max,
1791                 .maxlen         = sizeof(unsigned int),
1792                 .mode           = 0644,
1793                 .proc_handler   = sysctl_sched_uclamp_handler,
1794         },
1795 #endif
1796 #ifdef CONFIG_SCHED_AUTOGROUP
1797         {
1798                 .procname       = "sched_autogroup_enabled",
1799                 .data           = &sysctl_sched_autogroup_enabled,
1800                 .maxlen         = sizeof(unsigned int),
1801                 .mode           = 0644,
1802                 .proc_handler   = proc_dointvec_minmax,
1803                 .extra1         = SYSCTL_ZERO,
1804                 .extra2         = SYSCTL_ONE,
1805         },
1806 #endif
1807 #ifdef CONFIG_CFS_BANDWIDTH
1808         {
1809                 .procname       = "sched_cfs_bandwidth_slice_us",
1810                 .data           = &sysctl_sched_cfs_bandwidth_slice,
1811                 .maxlen         = sizeof(unsigned int),
1812                 .mode           = 0644,
1813                 .proc_handler   = proc_dointvec_minmax,
1814                 .extra1         = SYSCTL_ONE,
1815         },
1816 #endif
1817 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1818         {
1819                 .procname       = "sched_energy_aware",
1820                 .data           = &sysctl_sched_energy_aware,
1821                 .maxlen         = sizeof(unsigned int),
1822                 .mode           = 0644,
1823                 .proc_handler   = sched_energy_aware_handler,
1824                 .extra1         = SYSCTL_ZERO,
1825                 .extra2         = SYSCTL_ONE,
1826         },
1827 #endif
1828 #ifdef CONFIG_PROVE_LOCKING
1829         {
1830                 .procname       = "prove_locking",
1831                 .data           = &prove_locking,
1832                 .maxlen         = sizeof(int),
1833                 .mode           = 0644,
1834                 .proc_handler   = proc_dointvec,
1835         },
1836 #endif
1837 #ifdef CONFIG_LOCK_STAT
1838         {
1839                 .procname       = "lock_stat",
1840                 .data           = &lock_stat,
1841                 .maxlen         = sizeof(int),
1842                 .mode           = 0644,
1843                 .proc_handler   = proc_dointvec,
1844         },
1845 #endif
1846         {
1847                 .procname       = "panic",
1848                 .data           = &panic_timeout,
1849                 .maxlen         = sizeof(int),
1850                 .mode           = 0644,
1851                 .proc_handler   = proc_dointvec,
1852         },
1853 #ifdef CONFIG_COREDUMP
1854         {
1855                 .procname       = "core_uses_pid",
1856                 .data           = &core_uses_pid,
1857                 .maxlen         = sizeof(int),
1858                 .mode           = 0644,
1859                 .proc_handler   = proc_dointvec,
1860         },
1861         {
1862                 .procname       = "core_pattern",
1863                 .data           = core_pattern,
1864                 .maxlen         = CORENAME_MAX_SIZE,
1865                 .mode           = 0644,
1866                 .proc_handler   = proc_dostring_coredump,
1867         },
1868         {
1869                 .procname       = "core_pipe_limit",
1870                 .data           = &core_pipe_limit,
1871                 .maxlen         = sizeof(unsigned int),
1872                 .mode           = 0644,
1873                 .proc_handler   = proc_dointvec,
1874         },
1875 #endif
1876 #ifdef CONFIG_PROC_SYSCTL
1877         {
1878                 .procname       = "tainted",
1879                 .maxlen         = sizeof(long),
1880                 .mode           = 0644,
1881                 .proc_handler   = proc_taint,
1882         },
1883         {
1884                 .procname       = "sysctl_writes_strict",
1885                 .data           = &sysctl_writes_strict,
1886                 .maxlen         = sizeof(int),
1887                 .mode           = 0644,
1888                 .proc_handler   = proc_dointvec_minmax,
1889                 .extra1         = &neg_one,
1890                 .extra2         = SYSCTL_ONE,
1891         },
1892 #endif
1893 #ifdef CONFIG_LATENCYTOP
1894         {
1895                 .procname       = "latencytop",
1896                 .data           = &latencytop_enabled,
1897                 .maxlen         = sizeof(int),
1898                 .mode           = 0644,
1899                 .proc_handler   = sysctl_latencytop,
1900         },
1901 #endif
1902 #ifdef CONFIG_BLK_DEV_INITRD
1903         {
1904                 .procname       = "real-root-dev",
1905                 .data           = &real_root_dev,
1906                 .maxlen         = sizeof(int),
1907                 .mode           = 0644,
1908                 .proc_handler   = proc_dointvec,
1909         },
1910 #endif
1911         {
1912                 .procname       = "print-fatal-signals",
1913                 .data           = &print_fatal_signals,
1914                 .maxlen         = sizeof(int),
1915                 .mode           = 0644,
1916                 .proc_handler   = proc_dointvec,
1917         },
1918 #ifdef CONFIG_SPARC
1919         {
1920                 .procname       = "reboot-cmd",
1921                 .data           = reboot_command,
1922                 .maxlen         = 256,
1923                 .mode           = 0644,
1924                 .proc_handler   = proc_dostring,
1925         },
1926         {
1927                 .procname       = "stop-a",
1928                 .data           = &stop_a_enabled,
1929                 .maxlen         = sizeof (int),
1930                 .mode           = 0644,
1931                 .proc_handler   = proc_dointvec,
1932         },
1933         {
1934                 .procname       = "scons-poweroff",
1935                 .data           = &scons_pwroff,
1936                 .maxlen         = sizeof (int),
1937                 .mode           = 0644,
1938                 .proc_handler   = proc_dointvec,
1939         },
1940 #endif
1941 #ifdef CONFIG_SPARC64
1942         {
1943                 .procname       = "tsb-ratio",
1944                 .data           = &sysctl_tsb_ratio,
1945                 .maxlen         = sizeof (int),
1946                 .mode           = 0644,
1947                 .proc_handler   = proc_dointvec,
1948         },
1949 #endif
1950 #ifdef CONFIG_PARISC
1951         {
1952                 .procname       = "soft-power",
1953                 .data           = &pwrsw_enabled,
1954                 .maxlen         = sizeof (int),
1955                 .mode           = 0644,
1956                 .proc_handler   = proc_dointvec,
1957         },
1958 #endif
1959 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1960         {
1961                 .procname       = "unaligned-trap",
1962                 .data           = &unaligned_enabled,
1963                 .maxlen         = sizeof (int),
1964                 .mode           = 0644,
1965                 .proc_handler   = proc_dointvec,
1966         },
1967 #endif
1968         {
1969                 .procname       = "ctrl-alt-del",
1970                 .data           = &C_A_D,
1971                 .maxlen         = sizeof(int),
1972                 .mode           = 0644,
1973                 .proc_handler   = proc_dointvec,
1974         },
1975 #ifdef CONFIG_FUNCTION_TRACER
1976         {
1977                 .procname       = "ftrace_enabled",
1978                 .data           = &ftrace_enabled,
1979                 .maxlen         = sizeof(int),
1980                 .mode           = 0644,
1981                 .proc_handler   = ftrace_enable_sysctl,
1982         },
1983 #endif
1984 #ifdef CONFIG_STACK_TRACER
1985         {
1986                 .procname       = "stack_tracer_enabled",
1987                 .data           = &stack_tracer_enabled,
1988                 .maxlen         = sizeof(int),
1989                 .mode           = 0644,
1990                 .proc_handler   = stack_trace_sysctl,
1991         },
1992 #endif
1993 #ifdef CONFIG_TRACING
1994         {
1995                 .procname       = "ftrace_dump_on_oops",
1996                 .data           = &ftrace_dump_on_oops,
1997                 .maxlen         = sizeof(int),
1998                 .mode           = 0644,
1999                 .proc_handler   = proc_dointvec,
2000         },
2001         {
2002                 .procname       = "traceoff_on_warning",
2003                 .data           = &__disable_trace_on_warning,
2004                 .maxlen         = sizeof(__disable_trace_on_warning),
2005                 .mode           = 0644,
2006                 .proc_handler   = proc_dointvec,
2007         },
2008         {
2009                 .procname       = "tracepoint_printk",
2010                 .data           = &tracepoint_printk,
2011                 .maxlen         = sizeof(tracepoint_printk),
2012                 .mode           = 0644,
2013                 .proc_handler   = tracepoint_printk_sysctl,
2014         },
2015 #endif
2016 #ifdef CONFIG_KEXEC_CORE
2017         {
2018                 .procname       = "kexec_load_disabled",
2019                 .data           = &kexec_load_disabled,
2020                 .maxlen         = sizeof(int),
2021                 .mode           = 0644,
2022                 /* only handle a transition from default "0" to "1" */
2023                 .proc_handler   = proc_dointvec_minmax,
2024                 .extra1         = SYSCTL_ONE,
2025                 .extra2         = SYSCTL_ONE,
2026         },
2027 #endif
2028 #ifdef CONFIG_MODULES
2029         {
2030                 .procname       = "modprobe",
2031                 .data           = &modprobe_path,
2032                 .maxlen         = KMOD_PATH_LEN,
2033                 .mode           = 0644,
2034                 .proc_handler   = proc_dostring,
2035         },
2036         {
2037                 .procname       = "modules_disabled",
2038                 .data           = &modules_disabled,
2039                 .maxlen         = sizeof(int),
2040                 .mode           = 0644,
2041                 /* only handle a transition from default "0" to "1" */
2042                 .proc_handler   = proc_dointvec_minmax,
2043                 .extra1         = SYSCTL_ONE,
2044                 .extra2         = SYSCTL_ONE,
2045         },
2046 #endif
2047 #ifdef CONFIG_UEVENT_HELPER
2048         {
2049                 .procname       = "hotplug",
2050                 .data           = &uevent_helper,
2051                 .maxlen         = UEVENT_HELPER_PATH_LEN,
2052                 .mode           = 0644,
2053                 .proc_handler   = proc_dostring,
2054         },
2055 #endif
2056 #ifdef CONFIG_CHR_DEV_SG
2057         {
2058                 .procname       = "sg-big-buff",
2059                 .data           = &sg_big_buff,
2060                 .maxlen         = sizeof (int),
2061                 .mode           = 0444,
2062                 .proc_handler   = proc_dointvec,
2063         },
2064 #endif
2065 #ifdef CONFIG_BSD_PROCESS_ACCT
2066         {
2067                 .procname       = "acct",
2068                 .data           = &acct_parm,
2069                 .maxlen         = 3*sizeof(int),
2070                 .mode           = 0644,
2071                 .proc_handler   = proc_dointvec,
2072         },
2073 #endif
2074 #ifdef CONFIG_MAGIC_SYSRQ
2075         {
2076                 .procname       = "sysrq",
2077                 .data           = NULL,
2078                 .maxlen         = sizeof (int),
2079                 .mode           = 0644,
2080                 .proc_handler   = sysrq_sysctl_handler,
2081         },
2082 #endif
2083 #ifdef CONFIG_PROC_SYSCTL
2084         {
2085                 .procname       = "cad_pid",
2086                 .data           = NULL,
2087                 .maxlen         = sizeof (int),
2088                 .mode           = 0600,
2089                 .proc_handler   = proc_do_cad_pid,
2090         },
2091 #endif
2092         {
2093                 .procname       = "threads-max",
2094                 .data           = NULL,
2095                 .maxlen         = sizeof(int),
2096                 .mode           = 0644,
2097                 .proc_handler   = sysctl_max_threads,
2098         },
2099         {
2100                 .procname       = "random",
2101                 .mode           = 0555,
2102                 .child          = random_table,
2103         },
2104         {
2105                 .procname       = "usermodehelper",
2106                 .mode           = 0555,
2107                 .child          = usermodehelper_table,
2108         },
2109 #ifdef CONFIG_FW_LOADER_USER_HELPER
2110         {
2111                 .procname       = "firmware_config",
2112                 .mode           = 0555,
2113                 .child          = firmware_config_table,
2114         },
2115 #endif
2116         {
2117                 .procname       = "overflowuid",
2118                 .data           = &overflowuid,
2119                 .maxlen         = sizeof(int),
2120                 .mode           = 0644,
2121                 .proc_handler   = proc_dointvec_minmax,
2122                 .extra1         = &minolduid,
2123                 .extra2         = &maxolduid,
2124         },
2125         {
2126                 .procname       = "overflowgid",
2127                 .data           = &overflowgid,
2128                 .maxlen         = sizeof(int),
2129                 .mode           = 0644,
2130                 .proc_handler   = proc_dointvec_minmax,
2131                 .extra1         = &minolduid,
2132                 .extra2         = &maxolduid,
2133         },
2134 #ifdef CONFIG_S390
2135         {
2136                 .procname       = "userprocess_debug",
2137                 .data           = &show_unhandled_signals,
2138                 .maxlen         = sizeof(int),
2139                 .mode           = 0644,
2140                 .proc_handler   = proc_dointvec,
2141         },
2142 #endif
2143         {
2144                 .procname       = "pid_max",
2145                 .data           = &pid_max,
2146                 .maxlen         = sizeof (int),
2147                 .mode           = 0644,
2148                 .proc_handler   = proc_dointvec_minmax,
2149                 .extra1         = &pid_max_min,
2150                 .extra2         = &pid_max_max,
2151         },
2152         {
2153                 .procname       = "panic_on_oops",
2154                 .data           = &panic_on_oops,
2155                 .maxlen         = sizeof(int),
2156                 .mode           = 0644,
2157                 .proc_handler   = proc_dointvec,
2158         },
2159         {
2160                 .procname       = "panic_print",
2161                 .data           = &panic_print,
2162                 .maxlen         = sizeof(unsigned long),
2163                 .mode           = 0644,
2164                 .proc_handler   = proc_doulongvec_minmax,
2165         },
2166 #if defined CONFIG_PRINTK
2167         {
2168                 .procname       = "printk",
2169                 .data           = &console_loglevel,
2170                 .maxlen         = 4*sizeof(int),
2171                 .mode           = 0644,
2172                 .proc_handler   = proc_dointvec,
2173         },
2174         {
2175                 .procname       = "printk_ratelimit",
2176                 .data           = &printk_ratelimit_state.interval,
2177                 .maxlen         = sizeof(int),
2178                 .mode           = 0644,
2179                 .proc_handler   = proc_dointvec_jiffies,
2180         },
2181         {
2182                 .procname       = "printk_ratelimit_burst",
2183                 .data           = &printk_ratelimit_state.burst,
2184                 .maxlen         = sizeof(int),
2185                 .mode           = 0644,
2186                 .proc_handler   = proc_dointvec,
2187         },
2188         {
2189                 .procname       = "printk_delay",
2190                 .data           = &printk_delay_msec,
2191                 .maxlen         = sizeof(int),
2192                 .mode           = 0644,
2193                 .proc_handler   = proc_dointvec_minmax,
2194                 .extra1         = SYSCTL_ZERO,
2195                 .extra2         = &ten_thousand,
2196         },
2197         {
2198                 .procname       = "printk_devkmsg",
2199                 .data           = devkmsg_log_str,
2200                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
2201                 .mode           = 0644,
2202                 .proc_handler   = devkmsg_sysctl_set_loglvl,
2203         },
2204         {
2205                 .procname       = "dmesg_restrict",
2206                 .data           = &dmesg_restrict,
2207                 .maxlen         = sizeof(int),
2208                 .mode           = 0644,
2209                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2210                 .extra1         = SYSCTL_ZERO,
2211                 .extra2         = SYSCTL_ONE,
2212         },
2213         {
2214                 .procname       = "kptr_restrict",
2215                 .data           = &kptr_restrict,
2216                 .maxlen         = sizeof(int),
2217                 .mode           = 0644,
2218                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2219                 .extra1         = SYSCTL_ZERO,
2220                 .extra2         = &two,
2221         },
2222 #endif
2223         {
2224                 .procname       = "ngroups_max",
2225                 .data           = &ngroups_max,
2226                 .maxlen         = sizeof (int),
2227                 .mode           = 0444,
2228                 .proc_handler   = proc_dointvec,
2229         },
2230         {
2231                 .procname       = "cap_last_cap",
2232                 .data           = (void *)&cap_last_cap,
2233                 .maxlen         = sizeof(int),
2234                 .mode           = 0444,
2235                 .proc_handler   = proc_dointvec,
2236         },
2237 #if defined(CONFIG_LOCKUP_DETECTOR)
2238         {
2239                 .procname       = "watchdog",
2240                 .data           = &watchdog_user_enabled,
2241                 .maxlen         = sizeof(int),
2242                 .mode           = 0644,
2243                 .proc_handler   = proc_watchdog,
2244                 .extra1         = SYSCTL_ZERO,
2245                 .extra2         = SYSCTL_ONE,
2246         },
2247         {
2248                 .procname       = "watchdog_thresh",
2249                 .data           = &watchdog_thresh,
2250                 .maxlen         = sizeof(int),
2251                 .mode           = 0644,
2252                 .proc_handler   = proc_watchdog_thresh,
2253                 .extra1         = SYSCTL_ZERO,
2254                 .extra2         = &sixty,
2255         },
2256         {
2257                 .procname       = "nmi_watchdog",
2258                 .data           = &nmi_watchdog_user_enabled,
2259                 .maxlen         = sizeof(int),
2260                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
2261                 .proc_handler   = proc_nmi_watchdog,
2262                 .extra1         = SYSCTL_ZERO,
2263                 .extra2         = SYSCTL_ONE,
2264         },
2265         {
2266                 .procname       = "watchdog_cpumask",
2267                 .data           = &watchdog_cpumask_bits,
2268                 .maxlen         = NR_CPUS,
2269                 .mode           = 0644,
2270                 .proc_handler   = proc_watchdog_cpumask,
2271         },
2272 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2273         {
2274                 .procname       = "soft_watchdog",
2275                 .data           = &soft_watchdog_user_enabled,
2276                 .maxlen         = sizeof(int),
2277                 .mode           = 0644,
2278                 .proc_handler   = proc_soft_watchdog,
2279                 .extra1         = SYSCTL_ZERO,
2280                 .extra2         = SYSCTL_ONE,
2281         },
2282         {
2283                 .procname       = "softlockup_panic",
2284                 .data           = &softlockup_panic,
2285                 .maxlen         = sizeof(int),
2286                 .mode           = 0644,
2287                 .proc_handler   = proc_dointvec_minmax,
2288                 .extra1         = SYSCTL_ZERO,
2289                 .extra2         = SYSCTL_ONE,
2290         },
2291 #ifdef CONFIG_SMP
2292         {
2293                 .procname       = "softlockup_all_cpu_backtrace",
2294                 .data           = &sysctl_softlockup_all_cpu_backtrace,
2295                 .maxlen         = sizeof(int),
2296                 .mode           = 0644,
2297                 .proc_handler   = proc_dointvec_minmax,
2298                 .extra1         = SYSCTL_ZERO,
2299                 .extra2         = SYSCTL_ONE,
2300         },
2301 #endif /* CONFIG_SMP */
2302 #endif
2303 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2304         {
2305                 .procname       = "hardlockup_panic",
2306                 .data           = &hardlockup_panic,
2307                 .maxlen         = sizeof(int),
2308                 .mode           = 0644,
2309                 .proc_handler   = proc_dointvec_minmax,
2310                 .extra1         = SYSCTL_ZERO,
2311                 .extra2         = SYSCTL_ONE,
2312         },
2313 #ifdef CONFIG_SMP
2314         {
2315                 .procname       = "hardlockup_all_cpu_backtrace",
2316                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
2317                 .maxlen         = sizeof(int),
2318                 .mode           = 0644,
2319                 .proc_handler   = proc_dointvec_minmax,
2320                 .extra1         = SYSCTL_ZERO,
2321                 .extra2         = SYSCTL_ONE,
2322         },
2323 #endif /* CONFIG_SMP */
2324 #endif
2325 #endif
2326
2327 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2328         {
2329                 .procname       = "unknown_nmi_panic",
2330                 .data           = &unknown_nmi_panic,
2331                 .maxlen         = sizeof (int),
2332                 .mode           = 0644,
2333                 .proc_handler   = proc_dointvec,
2334         },
2335 #endif
2336 #if defined(CONFIG_X86)
2337         {
2338                 .procname       = "panic_on_unrecovered_nmi",
2339                 .data           = &panic_on_unrecovered_nmi,
2340                 .maxlen         = sizeof(int),
2341                 .mode           = 0644,
2342                 .proc_handler   = proc_dointvec,
2343         },
2344         {
2345                 .procname       = "panic_on_io_nmi",
2346                 .data           = &panic_on_io_nmi,
2347                 .maxlen         = sizeof(int),
2348                 .mode           = 0644,
2349                 .proc_handler   = proc_dointvec,
2350         },
2351 #ifdef CONFIG_DEBUG_STACKOVERFLOW
2352         {
2353                 .procname       = "panic_on_stackoverflow",
2354                 .data           = &sysctl_panic_on_stackoverflow,
2355                 .maxlen         = sizeof(int),
2356                 .mode           = 0644,
2357                 .proc_handler   = proc_dointvec,
2358         },
2359 #endif
2360         {
2361                 .procname       = "bootloader_type",
2362                 .data           = &bootloader_type,
2363                 .maxlen         = sizeof (int),
2364                 .mode           = 0444,
2365                 .proc_handler   = proc_dointvec,
2366         },
2367         {
2368                 .procname       = "bootloader_version",
2369                 .data           = &bootloader_version,
2370                 .maxlen         = sizeof (int),
2371                 .mode           = 0444,
2372                 .proc_handler   = proc_dointvec,
2373         },
2374         {
2375                 .procname       = "io_delay_type",
2376                 .data           = &io_delay_type,
2377                 .maxlen         = sizeof(int),
2378                 .mode           = 0644,
2379                 .proc_handler   = proc_dointvec,
2380         },
2381 #endif
2382 #if defined(CONFIG_MMU)
2383         {
2384                 .procname       = "randomize_va_space",
2385                 .data           = &randomize_va_space,
2386                 .maxlen         = sizeof(int),
2387                 .mode           = 0644,
2388                 .proc_handler   = proc_dointvec,
2389         },
2390 #endif
2391 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2392         {
2393                 .procname       = "spin_retry",
2394                 .data           = &spin_retry,
2395                 .maxlen         = sizeof (int),
2396                 .mode           = 0644,
2397                 .proc_handler   = proc_dointvec,
2398         },
2399 #endif
2400 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2401         {
2402                 .procname       = "acpi_video_flags",
2403                 .data           = &acpi_realmode_flags,
2404                 .maxlen         = sizeof (unsigned long),
2405                 .mode           = 0644,
2406                 .proc_handler   = proc_doulongvec_minmax,
2407         },
2408 #endif
2409 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2410         {
2411                 .procname       = "ignore-unaligned-usertrap",
2412                 .data           = &no_unaligned_warning,
2413                 .maxlen         = sizeof (int),
2414                 .mode           = 0644,
2415                 .proc_handler   = proc_dointvec,
2416         },
2417 #endif
2418 #ifdef CONFIG_IA64
2419         {
2420                 .procname       = "unaligned-dump-stack",
2421                 .data           = &unaligned_dump_stack,
2422                 .maxlen         = sizeof (int),
2423                 .mode           = 0644,
2424                 .proc_handler   = proc_dointvec,
2425         },
2426 #endif
2427 #ifdef CONFIG_DETECT_HUNG_TASK
2428         {
2429                 .procname       = "hung_task_panic",
2430                 .data           = &sysctl_hung_task_panic,
2431                 .maxlen         = sizeof(int),
2432                 .mode           = 0644,
2433                 .proc_handler   = proc_dointvec_minmax,
2434                 .extra1         = SYSCTL_ZERO,
2435                 .extra2         = SYSCTL_ONE,
2436         },
2437         {
2438                 .procname       = "hung_task_check_count",
2439                 .data           = &sysctl_hung_task_check_count,
2440                 .maxlen         = sizeof(int),
2441                 .mode           = 0644,
2442                 .proc_handler   = proc_dointvec_minmax,
2443                 .extra1         = SYSCTL_ZERO,
2444         },
2445         {
2446                 .procname       = "hung_task_timeout_secs",
2447                 .data           = &sysctl_hung_task_timeout_secs,
2448                 .maxlen         = sizeof(unsigned long),
2449                 .mode           = 0644,
2450                 .proc_handler   = proc_dohung_task_timeout_secs,
2451                 .extra2         = &hung_task_timeout_max,
2452         },
2453         {
2454                 .procname       = "hung_task_check_interval_secs",
2455                 .data           = &sysctl_hung_task_check_interval_secs,
2456                 .maxlen         = sizeof(unsigned long),
2457                 .mode           = 0644,
2458                 .proc_handler   = proc_dohung_task_timeout_secs,
2459                 .extra2         = &hung_task_timeout_max,
2460         },
2461         {
2462                 .procname       = "hung_task_warnings",
2463                 .data           = &sysctl_hung_task_warnings,
2464                 .maxlen         = sizeof(int),
2465                 .mode           = 0644,
2466                 .proc_handler   = proc_dointvec_minmax,
2467                 .extra1         = &neg_one,
2468         },
2469 #endif
2470 #ifdef CONFIG_RT_MUTEXES
2471         {
2472                 .procname       = "max_lock_depth",
2473                 .data           = &max_lock_depth,
2474                 .maxlen         = sizeof(int),
2475                 .mode           = 0644,
2476                 .proc_handler   = proc_dointvec,
2477         },
2478 #endif
2479         {
2480                 .procname       = "poweroff_cmd",
2481                 .data           = &poweroff_cmd,
2482                 .maxlen         = POWEROFF_CMD_PATH_LEN,
2483                 .mode           = 0644,
2484                 .proc_handler   = proc_dostring,
2485         },
2486 #ifdef CONFIG_KEYS
2487         {
2488                 .procname       = "keys",
2489                 .mode           = 0555,
2490                 .child          = key_sysctls,
2491         },
2492 #endif
2493 #ifdef CONFIG_PERF_EVENTS
2494         /*
2495          * User-space scripts rely on the existence of this file
2496          * as a feature check for perf_events being enabled.
2497          *
2498          * So it's an ABI, do not remove!
2499          */
2500         {
2501                 .procname       = "perf_event_paranoid",
2502                 .data           = &sysctl_perf_event_paranoid,
2503                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
2504                 .mode           = 0644,
2505                 .proc_handler   = proc_dointvec,
2506         },
2507         {
2508                 .procname       = "perf_event_mlock_kb",
2509                 .data           = &sysctl_perf_event_mlock,
2510                 .maxlen         = sizeof(sysctl_perf_event_mlock),
2511                 .mode           = 0644,
2512                 .proc_handler   = proc_dointvec,
2513         },
2514         {
2515                 .procname       = "perf_event_max_sample_rate",
2516                 .data           = &sysctl_perf_event_sample_rate,
2517                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
2518                 .mode           = 0644,
2519                 .proc_handler   = perf_proc_update_handler,
2520                 .extra1         = SYSCTL_ONE,
2521         },
2522         {
2523                 .procname       = "perf_cpu_time_max_percent",
2524                 .data           = &sysctl_perf_cpu_time_max_percent,
2525                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
2526                 .mode           = 0644,
2527                 .proc_handler   = perf_cpu_time_max_percent_handler,
2528                 .extra1         = SYSCTL_ZERO,
2529                 .extra2         = &one_hundred,
2530         },
2531         {
2532                 .procname       = "perf_event_max_stack",
2533                 .data           = &sysctl_perf_event_max_stack,
2534                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
2535                 .mode           = 0644,
2536                 .proc_handler   = perf_event_max_stack_handler,
2537                 .extra1         = SYSCTL_ZERO,
2538                 .extra2         = &six_hundred_forty_kb,
2539         },
2540         {
2541                 .procname       = "perf_event_max_contexts_per_stack",
2542                 .data           = &sysctl_perf_event_max_contexts_per_stack,
2543                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
2544                 .mode           = 0644,
2545                 .proc_handler   = perf_event_max_stack_handler,
2546                 .extra1         = SYSCTL_ZERO,
2547                 .extra2         = &one_thousand,
2548         },
2549 #endif
2550         {
2551                 .procname       = "panic_on_warn",
2552                 .data           = &panic_on_warn,
2553                 .maxlen         = sizeof(int),
2554                 .mode           = 0644,
2555                 .proc_handler   = proc_dointvec_minmax,
2556                 .extra1         = SYSCTL_ZERO,
2557                 .extra2         = SYSCTL_ONE,
2558         },
2559 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2560         {
2561                 .procname       = "timer_migration",
2562                 .data           = &sysctl_timer_migration,
2563                 .maxlen         = sizeof(unsigned int),
2564                 .mode           = 0644,
2565                 .proc_handler   = timer_migration_handler,
2566                 .extra1         = SYSCTL_ZERO,
2567                 .extra2         = SYSCTL_ONE,
2568         },
2569 #endif
2570 #ifdef CONFIG_BPF_SYSCALL
2571         {
2572                 .procname       = "unprivileged_bpf_disabled",
2573                 .data           = &sysctl_unprivileged_bpf_disabled,
2574                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
2575                 .mode           = 0644,
2576                 /* only handle a transition from default "0" to "1" */
2577                 .proc_handler   = proc_dointvec_minmax,
2578                 .extra1         = SYSCTL_ONE,
2579                 .extra2         = SYSCTL_ONE,
2580         },
2581         {
2582                 .procname       = "bpf_stats_enabled",
2583                 .data           = &bpf_stats_enabled_key.key,
2584                 .maxlen         = sizeof(bpf_stats_enabled_key),
2585                 .mode           = 0644,
2586                 .proc_handler   = bpf_stats_handler,
2587         },
2588 #endif
2589 #if defined(CONFIG_TREE_RCU)
2590         {
2591                 .procname       = "panic_on_rcu_stall",
2592                 .data           = &sysctl_panic_on_rcu_stall,
2593                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
2594                 .mode           = 0644,
2595                 .proc_handler   = proc_dointvec_minmax,
2596                 .extra1         = SYSCTL_ZERO,
2597                 .extra2         = SYSCTL_ONE,
2598         },
2599 #endif
2600 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2601         {
2602                 .procname       = "stack_erasing",
2603                 .data           = NULL,
2604                 .maxlen         = sizeof(int),
2605                 .mode           = 0600,
2606                 .proc_handler   = stack_erasing_sysctl,
2607                 .extra1         = SYSCTL_ZERO,
2608                 .extra2         = SYSCTL_ONE,
2609         },
2610 #endif
2611         { }
2612 };
2613
2614 static struct ctl_table vm_table[] = {
2615         {
2616                 .procname       = "overcommit_memory",
2617                 .data           = &sysctl_overcommit_memory,
2618                 .maxlen         = sizeof(sysctl_overcommit_memory),
2619                 .mode           = 0644,
2620                 .proc_handler   = proc_dointvec_minmax,
2621                 .extra1         = SYSCTL_ZERO,
2622                 .extra2         = &two,
2623         },
2624         {
2625                 .procname       = "panic_on_oom",
2626                 .data           = &sysctl_panic_on_oom,
2627                 .maxlen         = sizeof(sysctl_panic_on_oom),
2628                 .mode           = 0644,
2629                 .proc_handler   = proc_dointvec_minmax,
2630                 .extra1         = SYSCTL_ZERO,
2631                 .extra2         = &two,
2632         },
2633         {
2634                 .procname       = "oom_kill_allocating_task",
2635                 .data           = &sysctl_oom_kill_allocating_task,
2636                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
2637                 .mode           = 0644,
2638                 .proc_handler   = proc_dointvec,
2639         },
2640         {
2641                 .procname       = "oom_dump_tasks",
2642                 .data           = &sysctl_oom_dump_tasks,
2643                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
2644                 .mode           = 0644,
2645                 .proc_handler   = proc_dointvec,
2646         },
2647         {
2648                 .procname       = "overcommit_ratio",
2649                 .data           = &sysctl_overcommit_ratio,
2650                 .maxlen         = sizeof(sysctl_overcommit_ratio),
2651                 .mode           = 0644,
2652                 .proc_handler   = overcommit_ratio_handler,
2653         },
2654         {
2655                 .procname       = "overcommit_kbytes",
2656                 .data           = &sysctl_overcommit_kbytes,
2657                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
2658                 .mode           = 0644,
2659                 .proc_handler   = overcommit_kbytes_handler,
2660         },
2661         {
2662                 .procname       = "page-cluster",
2663                 .data           = &page_cluster,
2664                 .maxlen         = sizeof(int),
2665                 .mode           = 0644,
2666                 .proc_handler   = proc_dointvec_minmax,
2667                 .extra1         = SYSCTL_ZERO,
2668         },
2669         {
2670                 .procname       = "dirty_background_ratio",
2671                 .data           = &dirty_background_ratio,
2672                 .maxlen         = sizeof(dirty_background_ratio),
2673                 .mode           = 0644,
2674                 .proc_handler   = dirty_background_ratio_handler,
2675                 .extra1         = SYSCTL_ZERO,
2676                 .extra2         = &one_hundred,
2677         },
2678         {
2679                 .procname       = "dirty_background_bytes",
2680                 .data           = &dirty_background_bytes,
2681                 .maxlen         = sizeof(dirty_background_bytes),
2682                 .mode           = 0644,
2683                 .proc_handler   = dirty_background_bytes_handler,
2684                 .extra1         = &one_ul,
2685         },
2686         {
2687                 .procname       = "dirty_ratio",
2688                 .data           = &vm_dirty_ratio,
2689                 .maxlen         = sizeof(vm_dirty_ratio),
2690                 .mode           = 0644,
2691                 .proc_handler   = dirty_ratio_handler,
2692                 .extra1         = SYSCTL_ZERO,
2693                 .extra2         = &one_hundred,
2694         },
2695         {
2696                 .procname       = "dirty_bytes",
2697                 .data           = &vm_dirty_bytes,
2698                 .maxlen         = sizeof(vm_dirty_bytes),
2699                 .mode           = 0644,
2700                 .proc_handler   = dirty_bytes_handler,
2701                 .extra1         = &dirty_bytes_min,
2702         },
2703         {
2704                 .procname       = "dirty_writeback_centisecs",
2705                 .data           = &dirty_writeback_interval,
2706                 .maxlen         = sizeof(dirty_writeback_interval),
2707                 .mode           = 0644,
2708                 .proc_handler   = dirty_writeback_centisecs_handler,
2709         },
2710         {
2711                 .procname       = "dirty_expire_centisecs",
2712                 .data           = &dirty_expire_interval,
2713                 .maxlen         = sizeof(dirty_expire_interval),
2714                 .mode           = 0644,
2715                 .proc_handler   = proc_dointvec_minmax,
2716                 .extra1         = SYSCTL_ZERO,
2717         },
2718         {
2719                 .procname       = "dirtytime_expire_seconds",
2720                 .data           = &dirtytime_expire_interval,
2721                 .maxlen         = sizeof(dirtytime_expire_interval),
2722                 .mode           = 0644,
2723                 .proc_handler   = dirtytime_interval_handler,
2724                 .extra1         = SYSCTL_ZERO,
2725         },
2726         {
2727                 .procname       = "swappiness",
2728                 .data           = &vm_swappiness,
2729                 .maxlen         = sizeof(vm_swappiness),
2730                 .mode           = 0644,
2731                 .proc_handler   = proc_dointvec_minmax,
2732                 .extra1         = SYSCTL_ZERO,
2733                 .extra2         = &one_hundred,
2734         },
2735 #ifdef CONFIG_HUGETLB_PAGE
2736         {
2737                 .procname       = "nr_hugepages",
2738                 .data           = NULL,
2739                 .maxlen         = sizeof(unsigned long),
2740                 .mode           = 0644,
2741                 .proc_handler   = hugetlb_sysctl_handler,
2742         },
2743 #ifdef CONFIG_NUMA
2744         {
2745                 .procname       = "nr_hugepages_mempolicy",
2746                 .data           = NULL,
2747                 .maxlen         = sizeof(unsigned long),
2748                 .mode           = 0644,
2749                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
2750         },
2751         {
2752                 .procname               = "numa_stat",
2753                 .data                   = &sysctl_vm_numa_stat,
2754                 .maxlen                 = sizeof(int),
2755                 .mode                   = 0644,
2756                 .proc_handler   = sysctl_vm_numa_stat_handler,
2757                 .extra1                 = SYSCTL_ZERO,
2758                 .extra2                 = SYSCTL_ONE,
2759         },
2760 #endif
2761          {
2762                 .procname       = "hugetlb_shm_group",
2763                 .data           = &sysctl_hugetlb_shm_group,
2764                 .maxlen         = sizeof(gid_t),
2765                 .mode           = 0644,
2766                 .proc_handler   = proc_dointvec,
2767          },
2768         {
2769                 .procname       = "nr_overcommit_hugepages",
2770                 .data           = NULL,
2771                 .maxlen         = sizeof(unsigned long),
2772                 .mode           = 0644,
2773                 .proc_handler   = hugetlb_overcommit_handler,
2774         },
2775 #endif
2776         {
2777                 .procname       = "lowmem_reserve_ratio",
2778                 .data           = &sysctl_lowmem_reserve_ratio,
2779                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
2780                 .mode           = 0644,
2781                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
2782         },
2783         {
2784                 .procname       = "drop_caches",
2785                 .data           = &sysctl_drop_caches,
2786                 .maxlen         = sizeof(int),
2787                 .mode           = 0200,
2788                 .proc_handler   = drop_caches_sysctl_handler,
2789                 .extra1         = SYSCTL_ONE,
2790                 .extra2         = &four,
2791         },
2792 #ifdef CONFIG_COMPACTION
2793         {
2794                 .procname       = "compact_memory",
2795                 .data           = &sysctl_compact_memory,
2796                 .maxlen         = sizeof(int),
2797                 .mode           = 0200,
2798                 .proc_handler   = sysctl_compaction_handler,
2799         },
2800         {
2801                 .procname       = "extfrag_threshold",
2802                 .data           = &sysctl_extfrag_threshold,
2803                 .maxlen         = sizeof(int),
2804                 .mode           = 0644,
2805                 .proc_handler   = proc_dointvec_minmax,
2806                 .extra1         = &min_extfrag_threshold,
2807                 .extra2         = &max_extfrag_threshold,
2808         },
2809         {
2810                 .procname       = "compact_unevictable_allowed",
2811                 .data           = &sysctl_compact_unevictable_allowed,
2812                 .maxlen         = sizeof(int),
2813                 .mode           = 0644,
2814                 .proc_handler   = proc_dointvec_minmax_warn_RT_change,
2815                 .extra1         = SYSCTL_ZERO,
2816                 .extra2         = SYSCTL_ONE,
2817         },
2818
2819 #endif /* CONFIG_COMPACTION */
2820         {
2821                 .procname       = "min_free_kbytes",
2822                 .data           = &min_free_kbytes,
2823                 .maxlen         = sizeof(min_free_kbytes),
2824                 .mode           = 0644,
2825                 .proc_handler   = min_free_kbytes_sysctl_handler,
2826                 .extra1         = SYSCTL_ZERO,
2827         },
2828         {
2829                 .procname       = "watermark_boost_factor",
2830                 .data           = &watermark_boost_factor,
2831                 .maxlen         = sizeof(watermark_boost_factor),
2832                 .mode           = 0644,
2833                 .proc_handler   = proc_dointvec_minmax,
2834                 .extra1         = SYSCTL_ZERO,
2835         },
2836         {
2837                 .procname       = "watermark_scale_factor",
2838                 .data           = &watermark_scale_factor,
2839                 .maxlen         = sizeof(watermark_scale_factor),
2840                 .mode           = 0644,
2841                 .proc_handler   = watermark_scale_factor_sysctl_handler,
2842                 .extra1         = SYSCTL_ONE,
2843                 .extra2         = &one_thousand,
2844         },
2845         {
2846                 .procname       = "percpu_pagelist_fraction",
2847                 .data           = &percpu_pagelist_fraction,
2848                 .maxlen         = sizeof(percpu_pagelist_fraction),
2849                 .mode           = 0644,
2850                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
2851                 .extra1         = SYSCTL_ZERO,
2852         },
2853 #ifdef CONFIG_MMU
2854         {
2855                 .procname       = "max_map_count",
2856                 .data           = &sysctl_max_map_count,
2857                 .maxlen         = sizeof(sysctl_max_map_count),
2858                 .mode           = 0644,
2859                 .proc_handler   = proc_dointvec_minmax,
2860                 .extra1         = SYSCTL_ZERO,
2861         },
2862 #else
2863         {
2864                 .procname       = "nr_trim_pages",
2865                 .data           = &sysctl_nr_trim_pages,
2866                 .maxlen         = sizeof(sysctl_nr_trim_pages),
2867                 .mode           = 0644,
2868                 .proc_handler   = proc_dointvec_minmax,
2869                 .extra1         = SYSCTL_ZERO,
2870         },
2871 #endif
2872         {
2873                 .procname       = "laptop_mode",
2874                 .data           = &laptop_mode,
2875                 .maxlen         = sizeof(laptop_mode),
2876                 .mode           = 0644,
2877                 .proc_handler   = proc_dointvec_jiffies,
2878         },
2879         {
2880                 .procname       = "block_dump",
2881                 .data           = &block_dump,
2882                 .maxlen         = sizeof(block_dump),
2883                 .mode           = 0644,
2884                 .proc_handler   = proc_dointvec,
2885                 .extra1         = SYSCTL_ZERO,
2886         },
2887         {
2888                 .procname       = "vfs_cache_pressure",
2889                 .data           = &sysctl_vfs_cache_pressure,
2890                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
2891                 .mode           = 0644,
2892                 .proc_handler   = proc_dointvec,
2893                 .extra1         = SYSCTL_ZERO,
2894         },
2895 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2896     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2897         {
2898                 .procname       = "legacy_va_layout",
2899                 .data           = &sysctl_legacy_va_layout,
2900                 .maxlen         = sizeof(sysctl_legacy_va_layout),
2901                 .mode           = 0644,
2902                 .proc_handler   = proc_dointvec,
2903                 .extra1         = SYSCTL_ZERO,
2904         },
2905 #endif
2906 #ifdef CONFIG_NUMA
2907         {
2908                 .procname       = "zone_reclaim_mode",
2909                 .data           = &node_reclaim_mode,
2910                 .maxlen         = sizeof(node_reclaim_mode),
2911                 .mode           = 0644,
2912                 .proc_handler   = proc_dointvec,
2913                 .extra1         = SYSCTL_ZERO,
2914         },
2915         {
2916                 .procname       = "min_unmapped_ratio",
2917                 .data           = &sysctl_min_unmapped_ratio,
2918                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
2919                 .mode           = 0644,
2920                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
2921                 .extra1         = SYSCTL_ZERO,
2922                 .extra2         = &one_hundred,
2923         },
2924         {
2925                 .procname       = "min_slab_ratio",
2926                 .data           = &sysctl_min_slab_ratio,
2927                 .maxlen         = sizeof(sysctl_min_slab_ratio),
2928                 .mode           = 0644,
2929                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
2930                 .extra1         = SYSCTL_ZERO,
2931                 .extra2         = &one_hundred,
2932         },
2933 #endif
2934 #ifdef CONFIG_SMP
2935         {
2936                 .procname       = "stat_interval",
2937                 .data           = &sysctl_stat_interval,
2938                 .maxlen         = sizeof(sysctl_stat_interval),
2939                 .mode           = 0644,
2940                 .proc_handler   = proc_dointvec_jiffies,
2941         },
2942         {
2943                 .procname       = "stat_refresh",
2944                 .data           = NULL,
2945                 .maxlen         = 0,
2946                 .mode           = 0600,
2947                 .proc_handler   = vmstat_refresh,
2948         },
2949 #endif
2950 #ifdef CONFIG_MMU
2951         {
2952                 .procname       = "mmap_min_addr",
2953                 .data           = &dac_mmap_min_addr,
2954                 .maxlen         = sizeof(unsigned long),
2955                 .mode           = 0644,
2956                 .proc_handler   = mmap_min_addr_handler,
2957         },
2958 #endif
2959 #ifdef CONFIG_NUMA
2960         {
2961                 .procname       = "numa_zonelist_order",
2962                 .data           = &numa_zonelist_order,
2963                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
2964                 .mode           = 0644,
2965                 .proc_handler   = numa_zonelist_order_handler,
2966         },
2967 #endif
2968 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
2969    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
2970         {
2971                 .procname       = "vdso_enabled",
2972 #ifdef CONFIG_X86_32
2973                 .data           = &vdso32_enabled,
2974                 .maxlen         = sizeof(vdso32_enabled),
2975 #else
2976                 .data           = &vdso_enabled,
2977                 .maxlen         = sizeof(vdso_enabled),
2978 #endif
2979                 .mode           = 0644,
2980                 .proc_handler   = proc_dointvec,
2981                 .extra1         = SYSCTL_ZERO,
2982         },
2983 #endif
2984 #ifdef CONFIG_HIGHMEM
2985         {
2986                 .procname       = "highmem_is_dirtyable",
2987                 .data           = &vm_highmem_is_dirtyable,
2988                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
2989                 .mode           = 0644,
2990                 .proc_handler   = proc_dointvec_minmax,
2991                 .extra1         = SYSCTL_ZERO,
2992                 .extra2         = SYSCTL_ONE,
2993         },
2994 #endif
2995 #ifdef CONFIG_MEMORY_FAILURE
2996         {
2997                 .procname       = "memory_failure_early_kill",
2998                 .data           = &sysctl_memory_failure_early_kill,
2999                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
3000                 .mode           = 0644,
3001                 .proc_handler   = proc_dointvec_minmax,
3002                 .extra1         = SYSCTL_ZERO,
3003                 .extra2         = SYSCTL_ONE,
3004         },
3005         {
3006                 .procname       = "memory_failure_recovery",
3007                 .data           = &sysctl_memory_failure_recovery,
3008                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
3009                 .mode           = 0644,
3010                 .proc_handler   = proc_dointvec_minmax,
3011                 .extra1         = SYSCTL_ZERO,
3012                 .extra2         = SYSCTL_ONE,
3013         },
3014 #endif
3015         {
3016                 .procname       = "user_reserve_kbytes",
3017                 .data           = &sysctl_user_reserve_kbytes,
3018                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
3019                 .mode           = 0644,
3020                 .proc_handler   = proc_doulongvec_minmax,
3021         },
3022         {
3023                 .procname       = "admin_reserve_kbytes",
3024                 .data           = &sysctl_admin_reserve_kbytes,
3025                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
3026                 .mode           = 0644,
3027                 .proc_handler   = proc_doulongvec_minmax,
3028         },
3029 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3030         {
3031                 .procname       = "mmap_rnd_bits",
3032                 .data           = &mmap_rnd_bits,
3033                 .maxlen         = sizeof(mmap_rnd_bits),
3034                 .mode           = 0600,
3035                 .proc_handler   = proc_dointvec_minmax,
3036                 .extra1         = (void *)&mmap_rnd_bits_min,
3037                 .extra2         = (void *)&mmap_rnd_bits_max,
3038         },
3039 #endif
3040 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3041         {
3042                 .procname       = "mmap_rnd_compat_bits",
3043                 .data           = &mmap_rnd_compat_bits,
3044                 .maxlen         = sizeof(mmap_rnd_compat_bits),
3045                 .mode           = 0600,
3046                 .proc_handler   = proc_dointvec_minmax,
3047                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
3048                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
3049         },
3050 #endif
3051 #ifdef CONFIG_USERFAULTFD
3052         {
3053                 .procname       = "unprivileged_userfaultfd",
3054                 .data           = &sysctl_unprivileged_userfaultfd,
3055                 .maxlen         = sizeof(sysctl_unprivileged_userfaultfd),
3056                 .mode           = 0644,
3057                 .proc_handler   = proc_dointvec_minmax,
3058                 .extra1         = SYSCTL_ZERO,
3059                 .extra2         = SYSCTL_ONE,
3060         },
3061 #endif
3062         { }
3063 };
3064
3065 static struct ctl_table fs_table[] = {
3066         {
3067                 .procname       = "inode-nr",
3068                 .data           = &inodes_stat,
3069                 .maxlen         = 2*sizeof(long),
3070                 .mode           = 0444,
3071                 .proc_handler   = proc_nr_inodes,
3072         },
3073         {
3074                 .procname       = "inode-state",
3075                 .data           = &inodes_stat,
3076                 .maxlen         = 7*sizeof(long),
3077                 .mode           = 0444,
3078                 .proc_handler   = proc_nr_inodes,
3079         },
3080         {
3081                 .procname       = "file-nr",
3082                 .data           = &files_stat,
3083                 .maxlen         = sizeof(files_stat),
3084                 .mode           = 0444,
3085                 .proc_handler   = proc_nr_files,
3086         },
3087         {
3088                 .procname       = "file-max",
3089                 .data           = &files_stat.max_files,
3090                 .maxlen         = sizeof(files_stat.max_files),
3091                 .mode           = 0644,
3092                 .proc_handler   = proc_doulongvec_minmax,
3093                 .extra1         = &zero_ul,
3094                 .extra2         = &long_max,
3095         },
3096         {
3097                 .procname       = "nr_open",
3098                 .data           = &sysctl_nr_open,
3099                 .maxlen         = sizeof(unsigned int),
3100                 .mode           = 0644,
3101                 .proc_handler   = proc_dointvec_minmax,
3102                 .extra1         = &sysctl_nr_open_min,
3103                 .extra2         = &sysctl_nr_open_max,
3104         },
3105         {
3106                 .procname       = "dentry-state",
3107                 .data           = &dentry_stat,
3108                 .maxlen         = 6*sizeof(long),
3109                 .mode           = 0444,
3110                 .proc_handler   = proc_nr_dentry,
3111         },
3112         {
3113                 .procname       = "overflowuid",
3114                 .data           = &fs_overflowuid,
3115                 .maxlen         = sizeof(int),
3116                 .mode           = 0644,
3117                 .proc_handler   = proc_dointvec_minmax,
3118                 .extra1         = &minolduid,
3119                 .extra2         = &maxolduid,
3120         },
3121         {
3122                 .procname       = "overflowgid",
3123                 .data           = &fs_overflowgid,
3124                 .maxlen         = sizeof(int),
3125                 .mode           = 0644,
3126                 .proc_handler   = proc_dointvec_minmax,
3127                 .extra1         = &minolduid,
3128                 .extra2         = &maxolduid,
3129         },
3130 #ifdef CONFIG_FILE_LOCKING
3131         {
3132                 .procname       = "leases-enable",
3133                 .data           = &leases_enable,
3134                 .maxlen         = sizeof(int),
3135                 .mode           = 0644,
3136                 .proc_handler   = proc_dointvec,
3137         },
3138 #endif
3139 #ifdef CONFIG_DNOTIFY
3140         {
3141                 .procname       = "dir-notify-enable",
3142                 .data           = &dir_notify_enable,
3143                 .maxlen         = sizeof(int),
3144                 .mode           = 0644,
3145                 .proc_handler   = proc_dointvec,
3146         },
3147 #endif
3148 #ifdef CONFIG_MMU
3149 #ifdef CONFIG_FILE_LOCKING
3150         {
3151                 .procname       = "lease-break-time",
3152                 .data           = &lease_break_time,
3153                 .maxlen         = sizeof(int),
3154                 .mode           = 0644,
3155                 .proc_handler   = proc_dointvec,
3156         },
3157 #endif
3158 #ifdef CONFIG_AIO
3159         {
3160                 .procname       = "aio-nr",
3161                 .data           = &aio_nr,
3162                 .maxlen         = sizeof(aio_nr),
3163                 .mode           = 0444,
3164                 .proc_handler   = proc_doulongvec_minmax,
3165         },
3166         {
3167                 .procname       = "aio-max-nr",
3168                 .data           = &aio_max_nr,
3169                 .maxlen         = sizeof(aio_max_nr),
3170                 .mode           = 0644,
3171                 .proc_handler   = proc_doulongvec_minmax,
3172         },
3173 #endif /* CONFIG_AIO */
3174 #ifdef CONFIG_INOTIFY_USER
3175         {
3176                 .procname       = "inotify",
3177                 .mode           = 0555,
3178                 .child          = inotify_table,
3179         },
3180 #endif
3181 #ifdef CONFIG_EPOLL
3182         {
3183                 .procname       = "epoll",
3184                 .mode           = 0555,
3185                 .child          = epoll_table,
3186         },
3187 #endif
3188 #endif
3189         {
3190                 .procname       = "protected_symlinks",
3191                 .data           = &sysctl_protected_symlinks,
3192                 .maxlen         = sizeof(int),
3193                 .mode           = 0600,
3194                 .proc_handler   = proc_dointvec_minmax,
3195                 .extra1         = SYSCTL_ZERO,
3196                 .extra2         = SYSCTL_ONE,
3197         },
3198         {
3199                 .procname       = "protected_hardlinks",
3200                 .data           = &sysctl_protected_hardlinks,
3201                 .maxlen         = sizeof(int),
3202                 .mode           = 0600,
3203                 .proc_handler   = proc_dointvec_minmax,
3204                 .extra1         = SYSCTL_ZERO,
3205                 .extra2         = SYSCTL_ONE,
3206         },
3207         {
3208                 .procname       = "protected_fifos",
3209                 .data           = &sysctl_protected_fifos,
3210                 .maxlen         = sizeof(int),
3211                 .mode           = 0600,
3212                 .proc_handler   = proc_dointvec_minmax,
3213                 .extra1         = SYSCTL_ZERO,
3214                 .extra2         = &two,
3215         },
3216         {
3217                 .procname       = "protected_regular",
3218                 .data           = &sysctl_protected_regular,
3219                 .maxlen         = sizeof(int),
3220                 .mode           = 0600,
3221                 .proc_handler   = proc_dointvec_minmax,
3222                 .extra1         = SYSCTL_ZERO,
3223                 .extra2         = &two,
3224         },
3225         {
3226                 .procname       = "suid_dumpable",
3227                 .data           = &suid_dumpable,
3228                 .maxlen         = sizeof(int),
3229                 .mode           = 0644,
3230                 .proc_handler   = proc_dointvec_minmax_coredump,
3231                 .extra1         = SYSCTL_ZERO,
3232                 .extra2         = &two,
3233         },
3234 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3235         {
3236                 .procname       = "binfmt_misc",
3237                 .mode           = 0555,
3238                 .child          = sysctl_mount_point,
3239         },
3240 #endif
3241         {
3242                 .procname       = "pipe-max-size",
3243                 .data           = &pipe_max_size,
3244                 .maxlen         = sizeof(pipe_max_size),
3245                 .mode           = 0644,
3246                 .proc_handler   = proc_dopipe_max_size,
3247         },
3248         {
3249                 .procname       = "pipe-user-pages-hard",
3250                 .data           = &pipe_user_pages_hard,
3251                 .maxlen         = sizeof(pipe_user_pages_hard),
3252                 .mode           = 0644,
3253                 .proc_handler   = proc_doulongvec_minmax,
3254         },
3255         {
3256                 .procname       = "pipe-user-pages-soft",
3257                 .data           = &pipe_user_pages_soft,
3258                 .maxlen         = sizeof(pipe_user_pages_soft),
3259                 .mode           = 0644,
3260                 .proc_handler   = proc_doulongvec_minmax,
3261         },
3262         {
3263                 .procname       = "mount-max",
3264                 .data           = &sysctl_mount_max,
3265                 .maxlen         = sizeof(unsigned int),
3266                 .mode           = 0644,
3267                 .proc_handler   = proc_dointvec_minmax,
3268                 .extra1         = SYSCTL_ONE,
3269         },
3270         { }
3271 };
3272
3273 static struct ctl_table debug_table[] = {
3274 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3275         {
3276                 .procname       = "exception-trace",
3277                 .data           = &show_unhandled_signals,
3278                 .maxlen         = sizeof(int),
3279                 .mode           = 0644,
3280                 .proc_handler   = proc_dointvec
3281         },
3282 #endif
3283 #if defined(CONFIG_OPTPROBES)
3284         {
3285                 .procname       = "kprobes-optimization",
3286                 .data           = &sysctl_kprobes_optimization,
3287                 .maxlen         = sizeof(int),
3288                 .mode           = 0644,
3289                 .proc_handler   = proc_kprobes_optimization_handler,
3290                 .extra1         = SYSCTL_ZERO,
3291                 .extra2         = SYSCTL_ONE,
3292         },
3293 #endif
3294         { }
3295 };
3296
3297 static struct ctl_table dev_table[] = {
3298         { }
3299 };
3300
3301 static struct ctl_table sysctl_base_table[] = {
3302         {
3303                 .procname       = "kernel",
3304                 .mode           = 0555,
3305                 .child          = kern_table,
3306         },
3307         {
3308                 .procname       = "vm",
3309                 .mode           = 0555,
3310                 .child          = vm_table,
3311         },
3312         {
3313                 .procname       = "fs",
3314                 .mode           = 0555,
3315                 .child          = fs_table,
3316         },
3317         {
3318                 .procname       = "debug",
3319                 .mode           = 0555,
3320                 .child          = debug_table,
3321         },
3322         {
3323                 .procname       = "dev",
3324                 .mode           = 0555,
3325                 .child          = dev_table,
3326         },
3327         { }
3328 };
3329
3330 int __init sysctl_init(void)
3331 {
3332         struct ctl_table_header *hdr;
3333
3334         hdr = register_sysctl_table(sysctl_base_table);
3335         kmemleak_not_leak(hdr);
3336         return 0;
3337 }
3338 #endif /* CONFIG_SYSCTL */
3339 /*
3340  * No sense putting this after each symbol definition, twice,
3341  * exception granted :-)
3342  */
3343 EXPORT_SYMBOL(proc_dointvec);
3344 EXPORT_SYMBOL(proc_douintvec);
3345 EXPORT_SYMBOL(proc_dointvec_jiffies);
3346 EXPORT_SYMBOL(proc_dointvec_minmax);
3347 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3348 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3349 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3350 EXPORT_SYMBOL(proc_dostring);
3351 EXPORT_SYMBOL(proc_doulongvec_minmax);
3352 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3353 EXPORT_SYMBOL(proc_do_large_bitmap);