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/panic.h>
  31 #include <linux/printk.h>
  32 #include <linux/proc_fs.h>
  33 #include <linux/security.h>
  34 #include <linux/ctype.h>
  35 #include <linux/kmemleak.h>
  36 #include <linux/fs.h>
  37 #include <linux/init.h>
  38 #include <linux/kernel.h>
  39 #include <linux/kobject.h>
  40 #include <linux/net.h>
  41 #include <linux/sysrq.h>
  42 #include <linux/highuid.h>
  43 #include <linux/writeback.h>
  44 #include <linux/ratelimit.h>
  45 #include <linux/compaction.h>
  46 #include <linux/hugetlb.h>
  47 #include <linux/initrd.h>
  48 #include <linux/key.h>
  49 #include <linux/times.h>
  50 #include <linux/limits.h>
  51 #include <linux/dcache.h>
  52 #include <linux/dnotify.h>
  53 #include <linux/syscalls.h>
  54 #include <linux/vmstat.h>
  55 #include <linux/nfs_fs.h>
  56 #include <linux/acpi.h>
  57 #include <linux/reboot.h>
  58 #include <linux/ftrace.h>
  59 #include <linux/perf_event.h>
  60 #include <linux/kprobes.h>
  61 #include <linux/pipe_fs_i.h>
  62 #include <linux/oom.h>
  63 #include <linux/kmod.h>
  64 #include <linux/capability.h>
  65 #include <linux/binfmts.h>
  66 #include <linux/sched/sysctl.h>
  67 #include <linux/sched/coredump.h>
  68 #include <linux/kexec.h>
  69 #include <linux/bpf.h>
  70 #include <linux/mount.h>
  71 #include <linux/userfaultfd_k.h>
  72 #include <linux/coredump.h>
  73 #include <linux/latencytop.h>
  74 #include <linux/pid.h>
  75 #include <linux/delayacct.h>
  76
  77 #include "../lib/kstrtox.h"
  78
  79 #include <linux/uaccess.h>
  80 #include <asm/processor.h>
  81
  82 #ifdef CONFIG_X86
  83 #include <asm/nmi.h>
  84 #include <asm/stacktrace.h>
  85 #include <asm/io.h>
  86 #endif
  87 #ifdef CONFIG_SPARC
  88 #include <asm/setup.h>
  89 #endif
  90 #ifdef CONFIG_BSD_PROCESS_ACCT
  91 #include <linux/acct.h>
  92 #endif
  93 #ifdef CONFIG_RT_MUTEXES
  94 #include <linux/rtmutex.h>
  95 #endif
  96 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  97 #include <linux/lockdep.h>
  98 #endif
  99 #ifdef CONFIG_CHR_DEV_SG
 100 #include <scsi/sg.h>
 101 #endif
 102 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
 103 #include <linux/stackleak.h>
 104 #endif
 105 #ifdef CONFIG_LOCKUP_DETECTOR
 106 #include <linux/nmi.h>
 107 #endif
 108
 109 #if defined(CONFIG_SYSCTL)
 110
 111 /* Constants used for minimum and  maximum */
 112 #ifdef CONFIG_LOCKUP_DETECTOR
 113 static int sixty = 60;
 114 #endif
 115
 116 static int __maybe_unused neg_one = -1;
 117 static int __maybe_unused two = 2;
 118 static int __maybe_unused four = 4;
 119 static unsigned long zero_ul;
 120 static unsigned long one_ul = 1;
 121 static unsigned long long_max = LONG_MAX;
 122 static int one_hundred = 100;
 123 static int two_hundred = 200;
 124 static int one_thousand = 1000;
 125 #ifdef CONFIG_PRINTK
 126 static int ten_thousand = 10000;
 127 #endif
 128 #ifdef CONFIG_PERF_EVENTS
 129 static int six_hundred_forty_kb = 640 * 1024;
 130 #endif
 131
 132 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 133 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 134
 135 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 136 static int maxolduid = 65535;
 137 static int minolduid;
 138
 139 static int ngroups_max = NGROUPS_MAX;
 140 static const int cap_last_cap = CAP_LAST_CAP;
 141
 142 /*
 143  * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
 144  * and hung_task_check_interval_secs
 145  */
 146 #ifdef CONFIG_DETECT_HUNG_TASK
 147 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 148 #endif
 149
 150 #ifdef CONFIG_INOTIFY_USER
 151 #include <linux/inotify.h>
 152 #endif
 153 #ifdef CONFIG_FANOTIFY
 154 #include <linux/fanotify.h>
 155 #endif
 156
 157 #ifdef CONFIG_PROC_SYSCTL
 158
 159 /**
 160  * enum sysctl_writes_mode - supported sysctl write modes
 161  *
 162  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 163  *      to be written, and multiple writes on the same sysctl file descriptor
 164  *      will rewrite the sysctl value, regardless of file position. No warning
 165  *      is issued when the initial position is not 0.
 166  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 167  *      not 0.
 168  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 169  *      file position 0 and the value must be fully contained in the buffer
 170  *      sent to the write syscall. If dealing with strings respect the file
 171  *      position, but restrict this to the max length of the buffer, anything
 172  *      passed the max length will be ignored. Multiple writes will append
 173  *      to the buffer.
 174  *
 175  * These write modes control how current file position affects the behavior of
 176  * updating sysctl values through the proc interface on each write.
 177  */
 178 enum sysctl_writes_mode {
 179         SYSCTL_WRITES_LEGACY            = -1,
 180         SYSCTL_WRITES_WARN              = 0,
 181         SYSCTL_WRITES_STRICT            = 1,
 182 };
 183
 184 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 185 #endif /* CONFIG_PROC_SYSCTL */
 186
 187 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
 188     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
 189 int sysctl_legacy_va_layout;
 190 #endif
 191
 192 #ifdef CONFIG_COMPACTION
 193 static int min_extfrag_threshold;
 194 static int max_extfrag_threshold = 1000;
 195 #endif
 196
 197 #endif /* CONFIG_SYSCTL */
 198
 199 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
 200 static int bpf_stats_handler(struct ctl_table *table, int write,
 201                              void *buffer, size_t *lenp, loff_t *ppos)
 202 {
 203         struct static_key *key = (struct static_key *)table->data;
 204         static int saved_val;
 205         int val, ret;
 206         struct ctl_table tmp = {
 207                 .data   = &val,
 208                 .maxlen = sizeof(val),
 209                 .mode   = table->mode,
 210                 .extra1 = SYSCTL_ZERO,
 211                 .extra2 = SYSCTL_ONE,
 212         };
 213
 214         if (write && !capable(CAP_SYS_ADMIN))
 215                 return -EPERM;
 216
 217         mutex_lock(&bpf_stats_enabled_mutex);
 218         val = saved_val;
 219         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 220         if (write && !ret && val != saved_val) {
 221                 if (val)
 222                         static_key_slow_inc(key);
 223                 else
 224                         static_key_slow_dec(key);
 225                 saved_val = val;
 226         }
 227         mutex_unlock(&bpf_stats_enabled_mutex);
 228         return ret;
 229 }
 230
 231 static int bpf_unpriv_handler(struct ctl_table *table, int write,
 232                               void *buffer, size_t *lenp, loff_t *ppos)
 233 {
 234         int ret, unpriv_enable = *(int *)table->data;
 235         bool locked_state = unpriv_enable == 1;
 236         struct ctl_table tmp = *table;
 237
 238         if (write && !capable(CAP_SYS_ADMIN))
 239                 return -EPERM;
 240
 241         tmp.data = &unpriv_enable;
 242         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 243         if (write && !ret) {
 244                 if (locked_state && unpriv_enable != 1)
 245                         return -EPERM;
 246                 *(int *)table->data = unpriv_enable;
 247         }
 248         return ret;
 249 }
 250 #endif /* CONFIG_BPF_SYSCALL && CONFIG_SYSCTL */
 251
 252 /*
 253  * /proc/sys support
 254  */
 255
 256 #ifdef CONFIG_PROC_SYSCTL
 257
 258 static int _proc_do_string(char *data, int maxlen, int write,
 259                 char *buffer, size_t *lenp, loff_t *ppos)
 260 {
 261         size_t len;
 262         char c, *p;
 263
 264         if (!data || !maxlen || !*lenp) {
 265                 *lenp = 0;
 266                 return 0;
 267         }
 268
 269         if (write) {
 270                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
 271                         /* Only continue writes not past the end of buffer. */
 272                         len = strlen(data);
 273                         if (len > maxlen - 1)
 274                                 len = maxlen - 1;
 275
 276                         if (*ppos > len)
 277                                 return 0;
 278                         len = *ppos;
 279                 } else {
 280                         /* Start writing from beginning of buffer. */
 281                         len = 0;
 282                 }
 283
 284                 *ppos += *lenp;
 285                 p = buffer;
 286                 while ((p - buffer) < *lenp && len < maxlen - 1) {
 287                         c = *(p++);
 288                         if (c == 0 || c == '\n')
 289                                 break;
 290                         data[len++] = c;
 291                 }
 292                 data[len] = 0;
 293         } else {
 294                 len = strlen(data);
 295                 if (len > maxlen)
 296                         len = maxlen;
 297
 298                 if (*ppos > len) {
 299                         *lenp = 0;
 300                         return 0;
 301                 }
 302
 303                 data += *ppos;
 304                 len  -= *ppos;
 305
 306                 if (len > *lenp)
 307                         len = *lenp;
 308                 if (len)
 309                         memcpy(buffer, data, len);
 310                 if (len < *lenp) {
 311                         buffer[len] = '\n';
 312                         len++;
 313                 }
 314                 *lenp = len;
 315                 *ppos += len;
 316         }
 317         return 0;
 318 }
 319
 320 static void warn_sysctl_write(struct ctl_table *table)
 321 {
 322         pr_warn_once("%s wrote to %s when file position was not 0!\n"
 323                 "This will not be supported in the future. To silence this\n"
 324                 "warning, set kernel.sysctl_writes_strict = -1\n",
 325                 current->comm, table->procname);
 326 }
 327
 328 /**
 329  * proc_first_pos_non_zero_ignore - check if first position is allowed
 330  * @ppos: file position
 331  * @table: the sysctl table
 332  *
 333  * Returns true if the first position is non-zero and the sysctl_writes_strict
 334  * mode indicates this is not allowed for numeric input types. String proc
 335  * handlers can ignore the return value.
 336  */
 337 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
 338                                            struct ctl_table *table)
 339 {
 340         if (!*ppos)
 341                 return false;
 342
 343         switch (sysctl_writes_strict) {
 344         case SYSCTL_WRITES_STRICT:
 345                 return true;
 346         case SYSCTL_WRITES_WARN:
 347                 warn_sysctl_write(table);
 348                 return false;
 349         default:
 350                 return false;
 351         }
 352 }
 353
 354 /**
 355  * proc_dostring - read a string sysctl
 356  * @table: the sysctl table
 357  * @write: %TRUE if this is a write to the sysctl file
 358  * @buffer: the user buffer
 359  * @lenp: the size of the user buffer
 360  * @ppos: file position
 361  *
 362  * Reads/writes a string from/to the user buffer. If the kernel
 363  * buffer provided is not large enough to hold the string, the
 364  * string is truncated. The copied string is %NULL-terminated.
 365  * If the string is being read by the user process, it is copied
 366  * and a newline '\n' is added. It is truncated if the buffer is
 367  * not large enough.
 368  *
 369  * Returns 0 on success.
 370  */
 371 int proc_dostring(struct ctl_table *table, int write,
 372                   void *buffer, size_t *lenp, loff_t *ppos)
 373 {
 374         if (write)
 375                 proc_first_pos_non_zero_ignore(ppos, table);
 376
 377         return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
 378                         ppos);
 379 }
 380
 381 static size_t proc_skip_spaces(char **buf)
 382 {
 383         size_t ret;
 384         char *tmp = skip_spaces(*buf);
 385         ret = tmp - *buf;
 386         *buf = tmp;
 387         return ret;
 388 }
 389
 390 static void proc_skip_char(char **buf, size_t *size, const char v)
 391 {
 392         while (*size) {
 393                 if (**buf != v)
 394                         break;
 395                 (*size)--;
 396                 (*buf)++;
 397         }
 398 }
 399
 400 /**
 401  * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
 402  *                   fail on overflow
 403  *
 404  * @cp: kernel buffer containing the string to parse
 405  * @endp: pointer to store the trailing characters
 406  * @base: the base to use
 407  * @res: where the parsed integer will be stored
 408  *
 409  * In case of success 0 is returned and @res will contain the parsed integer,
 410  * @endp will hold any trailing characters.
 411  * This function will fail the parse on overflow. If there wasn't an overflow
 412  * the function will defer the decision what characters count as invalid to the
 413  * caller.
 414  */
 415 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
 416                            unsigned long *res)
 417 {
 418         unsigned long long result;
 419         unsigned int rv;
 420
 421         cp = _parse_integer_fixup_radix(cp, &base);
 422         rv = _parse_integer(cp, base, &result);
 423         if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
 424                 return -ERANGE;
 425
 426         cp += rv;
 427
 428         if (endp)
 429                 *endp = (char *)cp;
 430
 431         *res = (unsigned long)result;
 432         return 0;
 433 }
 434
 435 #define TMPBUFLEN 22
 436 /**
 437  * proc_get_long - reads an ASCII formatted integer from a user buffer
 438  *
 439  * @buf: a kernel buffer
 440  * @size: size of the kernel buffer
 441  * @val: this is where the number will be stored
 442  * @neg: set to %TRUE if number is negative
 443  * @perm_tr: a vector which contains the allowed trailers
 444  * @perm_tr_len: size of the perm_tr vector
 445  * @tr: pointer to store the trailer character
 446  *
 447  * In case of success %0 is returned and @buf and @size are updated with
 448  * the amount of bytes read. If @tr is non-NULL and a trailing
 449  * character exists (size is non-zero after returning from this
 450  * function), @tr is updated with the trailing character.
 451  */
 452 static int proc_get_long(char **buf, size_t *size,
 453                           unsigned long *val, bool *neg,
 454                           const char *perm_tr, unsigned perm_tr_len, char *tr)
 455 {
 456         int len;
 457         char *p, tmp[TMPBUFLEN];
 458
 459         if (!*size)
 460                 return -EINVAL;
 461
 462         len = *size;
 463         if (len > TMPBUFLEN - 1)
 464                 len = TMPBUFLEN - 1;
 465
 466         memcpy(tmp, *buf, len);
 467
 468         tmp[len] = 0;
 469         p = tmp;
 470         if (*p == '-' && *size > 1) {
 471                 *neg = true;
 472                 p++;
 473         } else
 474                 *neg = false;
 475         if (!isdigit(*p))
 476                 return -EINVAL;
 477
 478         if (strtoul_lenient(p, &p, 0, val))
 479                 return -EINVAL;
 480
 481         len = p - tmp;
 482
 483         /* We don't know if the next char is whitespace thus we may accept
 484          * invalid integers (e.g. 1234...a) or two integers instead of one
 485          * (e.g. 123...1). So lets not allow such large numbers. */
 486         if (len == TMPBUFLEN - 1)
 487                 return -EINVAL;
 488
 489         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
 490                 return -EINVAL;
 491
 492         if (tr && (len < *size))
 493                 *tr = *p;
 494
 495         *buf += len;
 496         *size -= len;
 497
 498         return 0;
 499 }
 500
 501 /**
 502  * proc_put_long - converts an integer to a decimal ASCII formatted string
 503  *
 504  * @buf: the user buffer
 505  * @size: the size of the user buffer
 506  * @val: the integer to be converted
 507  * @neg: sign of the number, %TRUE for negative
 508  *
 509  * In case of success @buf and @size are updated with the amount of bytes
 510  * written.
 511  */
 512 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
 513 {
 514         int len;
 515         char tmp[TMPBUFLEN], *p = tmp;
 516
 517         sprintf(p, "%s%lu", neg ? "-" : "", val);
 518         len = strlen(tmp);
 519         if (len > *size)
 520                 len = *size;
 521         memcpy(*buf, tmp, len);
 522         *size -= len;
 523         *buf += len;
 524 }
 525 #undef TMPBUFLEN
 526
 527 static void proc_put_char(void **buf, size_t *size, char c)
 528 {
 529         if (*size) {
 530                 char **buffer = (char **)buf;
 531                 **buffer = c;
 532
 533                 (*size)--;
 534                 (*buffer)++;
 535                 *buf = *buffer;
 536         }
 537 }
 538
 539 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
 540                                  int *valp,
 541                                  int write, void *data)
 542 {
 543         if (write) {
 544                 if (*negp) {
 545                         if (*lvalp > (unsigned long) INT_MAX + 1)
 546                                 return -EINVAL;
 547                         *valp = -*lvalp;
 548                 } else {
 549                         if (*lvalp > (unsigned long) INT_MAX)
 550                                 return -EINVAL;
 551                         *valp = *lvalp;
 552                 }
 553         } else {
 554                 int val = *valp;
 555                 if (val < 0) {
 556                         *negp = true;
 557                         *lvalp = -(unsigned long)val;
 558                 } else {
 559                         *negp = false;
 560                         *lvalp = (unsigned long)val;
 561                 }
 562         }
 563         return 0;
 564 }
 565
 566 static int do_proc_douintvec_conv(unsigned long *lvalp,
 567                                   unsigned int *valp,
 568                                   int write, void *data)
 569 {
 570         if (write) {
 571                 if (*lvalp > UINT_MAX)
 572                         return -EINVAL;
 573                 *valp = *lvalp;
 574         } else {
 575                 unsigned int val = *valp;
 576                 *lvalp = (unsigned long)val;
 577         }
 578         return 0;
 579 }
 580
 581 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
 582
 583 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
 584                   int write, void *buffer,
 585                   size_t *lenp, loff_t *ppos,
 586                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 587                               int write, void *data),
 588                   void *data)
 589 {
 590         int *i, vleft, first = 1, err = 0;
 591         size_t left;
 592         char *p;
 593
 594         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 595                 *lenp = 0;
 596                 return 0;
 597         }
 598
 599         i = (int *) tbl_data;
 600         vleft = table->maxlen / sizeof(*i);
 601         left = *lenp;
 602
 603         if (!conv)
 604                 conv = do_proc_dointvec_conv;
 605
 606         if (write) {
 607                 if (proc_first_pos_non_zero_ignore(ppos, table))
 608                         goto out;
 609
 610                 if (left > PAGE_SIZE - 1)
 611                         left = PAGE_SIZE - 1;
 612                 p = buffer;
 613         }
 614
 615         for (; left && vleft--; i++, first=0) {
 616                 unsigned long lval;
 617                 bool neg;
 618
 619                 if (write) {
 620                         left -= proc_skip_spaces(&p);
 621
 622                         if (!left)
 623                                 break;
 624                         err = proc_get_long(&p, &left, &lval, &neg,
 625                                              proc_wspace_sep,
 626                                              sizeof(proc_wspace_sep), NULL);
 627                         if (err)
 628                                 break;
 629                         if (conv(&neg, &lval, i, 1, data)) {
 630                                 err = -EINVAL;
 631                                 break;
 632                         }
 633                 } else {
 634                         if (conv(&neg, &lval, i, 0, data)) {
 635                                 err = -EINVAL;
 636                                 break;
 637                         }
 638                         if (!first)
 639                                 proc_put_char(&buffer, &left, '\t');
 640                         proc_put_long(&buffer, &left, lval, neg);
 641                 }
 642         }
 643
 644         if (!write && !first && left && !err)
 645                 proc_put_char(&buffer, &left, '\n');
 646         if (write && !err && left)
 647                 left -= proc_skip_spaces(&p);
 648         if (write && first)
 649                 return err ? : -EINVAL;
 650         *lenp -= left;
 651 out:
 652         *ppos += *lenp;
 653         return err;
 654 }
 655
 656 static int do_proc_dointvec(struct ctl_table *table, int write,
 657                   void *buffer, size_t *lenp, loff_t *ppos,
 658                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 659                               int write, void *data),
 660                   void *data)
 661 {
 662         return __do_proc_dointvec(table->data, table, write,
 663                         buffer, lenp, ppos, conv, data);
 664 }
 665
 666 static int do_proc_douintvec_w(unsigned int *tbl_data,
 667                                struct ctl_table *table,
 668                                void *buffer,
 669                                size_t *lenp, loff_t *ppos,
 670                                int (*conv)(unsigned long *lvalp,
 671                                            unsigned int *valp,
 672                                            int write, void *data),
 673                                void *data)
 674 {
 675         unsigned long lval;
 676         int err = 0;
 677         size_t left;
 678         bool neg;
 679         char *p = buffer;
 680
 681         left = *lenp;
 682
 683         if (proc_first_pos_non_zero_ignore(ppos, table))
 684                 goto bail_early;
 685
 686         if (left > PAGE_SIZE - 1)
 687                 left = PAGE_SIZE - 1;
 688
 689         left -= proc_skip_spaces(&p);
 690         if (!left) {
 691                 err = -EINVAL;
 692                 goto out_free;
 693         }
 694
 695         err = proc_get_long(&p, &left, &lval, &neg,
 696                              proc_wspace_sep,
 697                              sizeof(proc_wspace_sep), NULL);
 698         if (err || neg) {
 699                 err = -EINVAL;
 700                 goto out_free;
 701         }
 702
 703         if (conv(&lval, tbl_data, 1, data)) {
 704                 err = -EINVAL;
 705                 goto out_free;
 706         }
 707
 708         if (!err && left)
 709                 left -= proc_skip_spaces(&p);
 710
 711 out_free:
 712         if (err)
 713                 return -EINVAL;
 714
 715         return 0;
 716
 717         /* This is in keeping with old __do_proc_dointvec() */
 718 bail_early:
 719         *ppos += *lenp;
 720         return err;
 721 }
 722
 723 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
 724                                size_t *lenp, loff_t *ppos,
 725                                int (*conv)(unsigned long *lvalp,
 726                                            unsigned int *valp,
 727                                            int write, void *data),
 728                                void *data)
 729 {
 730         unsigned long lval;
 731         int err = 0;
 732         size_t left;
 733
 734         left = *lenp;
 735
 736         if (conv(&lval, tbl_data, 0, data)) {
 737                 err = -EINVAL;
 738                 goto out;
 739         }
 740
 741         proc_put_long(&buffer, &left, lval, false);
 742         if (!left)
 743                 goto out;
 744
 745         proc_put_char(&buffer, &left, '\n');
 746
 747 out:
 748         *lenp -= left;
 749         *ppos += *lenp;
 750
 751         return err;
 752 }
 753
 754 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
 755                                int write, void *buffer,
 756                                size_t *lenp, loff_t *ppos,
 757                                int (*conv)(unsigned long *lvalp,
 758                                            unsigned int *valp,
 759                                            int write, void *data),
 760                                void *data)
 761 {
 762         unsigned int *i, vleft;
 763
 764         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 765                 *lenp = 0;
 766                 return 0;
 767         }
 768
 769         i = (unsigned int *) tbl_data;
 770         vleft = table->maxlen / sizeof(*i);
 771
 772         /*
 773          * Arrays are not supported, keep this simple. *Do not* add
 774          * support for them.
 775          */
 776         if (vleft != 1) {
 777                 *lenp = 0;
 778                 return -EINVAL;
 779         }
 780
 781         if (!conv)
 782                 conv = do_proc_douintvec_conv;
 783
 784         if (write)
 785                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
 786                                            conv, data);
 787         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
 788 }
 789
 790 static int do_proc_douintvec(struct ctl_table *table, int write,
 791                              void *buffer, size_t *lenp, loff_t *ppos,
 792                              int (*conv)(unsigned long *lvalp,
 793                                          unsigned int *valp,
 794                                          int write, void *data),
 795                              void *data)
 796 {
 797         return __do_proc_douintvec(table->data, table, write,
 798                                    buffer, lenp, ppos, conv, data);
 799 }
 800
 801 /**
 802  * proc_dointvec - read a vector of integers
 803  * @table: the sysctl table
 804  * @write: %TRUE if this is a write to the sysctl file
 805  * @buffer: the user buffer
 806  * @lenp: the size of the user buffer
 807  * @ppos: file position
 808  *
 809  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 810  * values from/to the user buffer, treated as an ASCII string.
 811  *
 812  * Returns 0 on success.
 813  */
 814 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
 815                   size_t *lenp, loff_t *ppos)
 816 {
 817         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
 818 }
 819
 820 #ifdef CONFIG_COMPACTION
 821 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
 822                 int write, void *buffer, size_t *lenp, loff_t *ppos)
 823 {
 824         int ret, old;
 825
 826         if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
 827                 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 828
 829         old = *(int *)table->data;
 830         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 831         if (ret)
 832                 return ret;
 833         if (old != *(int *)table->data)
 834                 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
 835                              table->procname, current->comm,
 836                              task_pid_nr(current));
 837         return ret;
 838 }
 839 #endif
 840
 841 /**
 842  * proc_douintvec - read a vector of unsigned integers
 843  * @table: the sysctl table
 844  * @write: %TRUE if this is a write to the sysctl file
 845  * @buffer: the user buffer
 846  * @lenp: the size of the user buffer
 847  * @ppos: file position
 848  *
 849  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
 850  * values from/to the user buffer, treated as an ASCII string.
 851  *
 852  * Returns 0 on success.
 853  */
 854 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
 855                 size_t *lenp, loff_t *ppos)
 856 {
 857         return do_proc_douintvec(table, write, buffer, lenp, ppos,
 858                                  do_proc_douintvec_conv, NULL);
 859 }
 860
 861 /*
 862  * Taint values can only be increased
 863  * This means we can safely use a temporary.
 864  */
 865 static int proc_taint(struct ctl_table *table, int write,
 866                                void *buffer, size_t *lenp, loff_t *ppos)
 867 {
 868         struct ctl_table t;
 869         unsigned long tmptaint = get_taint();
 870         int err;
 871
 872         if (write && !capable(CAP_SYS_ADMIN))
 873                 return -EPERM;
 874
 875         t = *table;
 876         t.data = &tmptaint;
 877         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
 878         if (err < 0)
 879                 return err;
 880
 881         if (write) {
 882                 int i;
 883
 884                 /*
 885                  * If we are relying on panic_on_taint not producing
 886                  * false positives due to userspace input, bail out
 887                  * before setting the requested taint flags.
 888                  */
 889                 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
 890                         return -EINVAL;
 891
 892                 /*
 893                  * Poor man's atomic or. Not worth adding a primitive
 894                  * to everyone's atomic.h for this
 895                  */
 896                 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
 897                         if ((1UL << i) & tmptaint)
 898                                 add_taint(i, LOCKDEP_STILL_OK);
 899         }
 900
 901         return err;
 902 }
 903
 904 #ifdef CONFIG_PRINTK
 905 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 906                                 void *buffer, size_t *lenp, loff_t *ppos)
 907 {
 908         if (write && !capable(CAP_SYS_ADMIN))
 909                 return -EPERM;
 910
 911         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 912 }
 913 #endif
 914
 915 /**
 916  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
 917  * @min: pointer to minimum allowable value
 918  * @max: pointer to maximum allowable value
 919  *
 920  * The do_proc_dointvec_minmax_conv_param structure provides the
 921  * minimum and maximum values for doing range checking for those sysctl
 922  * parameters that use the proc_dointvec_minmax() handler.
 923  */
 924 struct do_proc_dointvec_minmax_conv_param {
 925         int *min;
 926         int *max;
 927 };
 928
 929 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
 930                                         int *valp,
 931                                         int write, void *data)
 932 {
 933         int tmp, ret;
 934         struct do_proc_dointvec_minmax_conv_param *param = data;
 935         /*
 936          * If writing, first do so via a temporary local int so we can
 937          * bounds-check it before touching *valp.
 938          */
 939         int *ip = write ? &tmp : valp;
 940
 941         ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
 942         if (ret)
 943                 return ret;
 944
 945         if (write) {
 946                 if ((param->min && *param->min > tmp) ||
 947                     (param->max && *param->max < tmp))
 948                         return -EINVAL;
 949                 *valp = tmp;
 950         }
 951
 952         return 0;
 953 }
 954
 955 /**
 956  * proc_dointvec_minmax - read a vector of integers with min/max values
 957  * @table: the sysctl table
 958  * @write: %TRUE if this is a write to the sysctl file
 959  * @buffer: the user buffer
 960  * @lenp: the size of the user buffer
 961  * @ppos: file position
 962  *
 963  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 964  * values from/to the user buffer, treated as an ASCII string.
 965  *
 966  * This routine will ensure the values are within the range specified by
 967  * table->extra1 (min) and table->extra2 (max).
 968  *
 969  * Returns 0 on success or -EINVAL on write when the range check fails.
 970  */
 971 int proc_dointvec_minmax(struct ctl_table *table, int write,
 972                   void *buffer, size_t *lenp, loff_t *ppos)
 973 {
 974         struct do_proc_dointvec_minmax_conv_param param = {
 975                 .min = (int *) table->extra1,
 976                 .max = (int *) table->extra2,
 977         };
 978         return do_proc_dointvec(table, write, buffer, lenp, ppos,
 979                                 do_proc_dointvec_minmax_conv, &param);
 980 }
 981
 982 /**
 983  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
 984  * @min: pointer to minimum allowable value
 985  * @max: pointer to maximum allowable value
 986  *
 987  * The do_proc_douintvec_minmax_conv_param structure provides the
 988  * minimum and maximum values for doing range checking for those sysctl
 989  * parameters that use the proc_douintvec_minmax() handler.
 990  */
 991 struct do_proc_douintvec_minmax_conv_param {
 992         unsigned int *min;
 993         unsigned int *max;
 994 };
 995
 996 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
 997                                          unsigned int *valp,
 998                                          int write, void *data)
 999 {
1000         int ret;
1001         unsigned int tmp;
1002         struct do_proc_douintvec_minmax_conv_param *param = data;
1003         /* write via temporary local uint for bounds-checking */
1004         unsigned int *up = write ? &tmp : valp;
1005
1006         ret = do_proc_douintvec_conv(lvalp, up, write, data);
1007         if (ret)
1008                 return ret;
1009
1010         if (write) {
1011                 if ((param->min && *param->min > tmp) ||
1012                     (param->max && *param->max < tmp))
1013                         return -ERANGE;
1014
1015                 *valp = tmp;
1016         }
1017
1018         return 0;
1019 }
1020
1021 /**
1022  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1023  * @table: the sysctl table
1024  * @write: %TRUE if this is a write to the sysctl file
1025  * @buffer: the user buffer
1026  * @lenp: the size of the user buffer
1027  * @ppos: file position
1028  *
1029  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1030  * values from/to the user buffer, treated as an ASCII string. Negative
1031  * strings are not allowed.
1032  *
1033  * This routine will ensure the values are within the range specified by
1034  * table->extra1 (min) and table->extra2 (max). There is a final sanity
1035  * check for UINT_MAX to avoid having to support wrap around uses from
1036  * userspace.
1037  *
1038  * Returns 0 on success or -ERANGE on write when the range check fails.
1039  */
1040 int proc_douintvec_minmax(struct ctl_table *table, int write,
1041                           void *buffer, size_t *lenp, loff_t *ppos)
1042 {
1043         struct do_proc_douintvec_minmax_conv_param param = {
1044                 .min = (unsigned int *) table->extra1,
1045                 .max = (unsigned int *) table->extra2,
1046         };
1047         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1048                                  do_proc_douintvec_minmax_conv, &param);
1049 }
1050
1051 /**
1052  * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
1053  * @table: the sysctl table
1054  * @write: %TRUE if this is a write to the sysctl file
1055  * @buffer: the user buffer
1056  * @lenp: the size of the user buffer
1057  * @ppos: file position
1058  *
1059  * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
1060  * values from/to the user buffer, treated as an ASCII string. Negative
1061  * strings are not allowed.
1062  *
1063  * This routine will ensure the values are within the range specified by
1064  * table->extra1 (min) and table->extra2 (max).
1065  *
1066  * Returns 0 on success or an error on write when the range check fails.
1067  */
1068 int proc_dou8vec_minmax(struct ctl_table *table, int write,
1069                         void *buffer, size_t *lenp, loff_t *ppos)
1070 {
1071         struct ctl_table tmp;
1072         unsigned int min = 0, max = 255U, val;
1073         u8 *data = table->data;
1074         struct do_proc_douintvec_minmax_conv_param param = {
1075                 .min = &min,
1076                 .max = &max,
1077         };
1078         int res;
1079
1080         /* Do not support arrays yet. */
1081         if (table->maxlen != sizeof(u8))
1082                 return -EINVAL;
1083
1084         if (table->extra1) {
1085                 min = *(unsigned int *) table->extra1;
1086                 if (min > 255U)
1087                         return -EINVAL;
1088         }
1089         if (table->extra2) {
1090                 max = *(unsigned int *) table->extra2;
1091                 if (max > 255U)
1092                         return -EINVAL;
1093         }
1094
1095         tmp = *table;
1096
1097         tmp.maxlen = sizeof(val);
1098         tmp.data = &val;
1099         val = *data;
1100         res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
1101                                 do_proc_douintvec_minmax_conv, &param);
1102         if (res)
1103                 return res;
1104         if (write)
1105                 *data = val;
1106         return 0;
1107 }
1108 EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
1109
1110 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1111                                         unsigned int *valp,
1112                                         int write, void *data)
1113 {
1114         if (write) {
1115                 unsigned int val;
1116
1117                 val = round_pipe_size(*lvalp);
1118                 if (val == 0)
1119                         return -EINVAL;
1120
1121                 *valp = val;
1122         } else {
1123                 unsigned int val = *valp;
1124                 *lvalp = (unsigned long) val;
1125         }
1126
1127         return 0;
1128 }
1129
1130 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1131                                 void *buffer, size_t *lenp, loff_t *ppos)
1132 {
1133         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1134                                  do_proc_dopipe_max_size_conv, NULL);
1135 }
1136
1137 static void validate_coredump_safety(void)
1138 {
1139 #ifdef CONFIG_COREDUMP
1140         if (suid_dumpable == SUID_DUMP_ROOT &&
1141             core_pattern[0] != '/' && core_pattern[0] != '|') {
1142                 printk(KERN_WARNING
1143 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1144 "Pipe handler or fully qualified core dump path required.\n"
1145 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1146                 );
1147         }
1148 #endif
1149 }
1150
1151 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1152                 void *buffer, size_t *lenp, loff_t *ppos)
1153 {
1154         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1155         if (!error)
1156                 validate_coredump_safety();
1157         return error;
1158 }
1159
1160 #ifdef CONFIG_COREDUMP
1161 static int proc_dostring_coredump(struct ctl_table *table, int write,
1162                   void *buffer, size_t *lenp, loff_t *ppos)
1163 {
1164         int error = proc_dostring(table, write, buffer, lenp, ppos);
1165         if (!error)
1166                 validate_coredump_safety();
1167         return error;
1168 }
1169 #endif
1170
1171 #ifdef CONFIG_MAGIC_SYSRQ
1172 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1173                                 void *buffer, size_t *lenp, loff_t *ppos)
1174 {
1175         int tmp, ret;
1176
1177         tmp = sysrq_mask();
1178
1179         ret = __do_proc_dointvec(&tmp, table, write, buffer,
1180                                lenp, ppos, NULL, NULL);
1181         if (ret || !write)
1182                 return ret;
1183
1184         if (write)
1185                 sysrq_toggle_support(tmp);
1186
1187         return 0;
1188 }
1189 #endif
1190
1191 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1192                 int write, void *buffer, size_t *lenp, loff_t *ppos,
1193                 unsigned long convmul, unsigned long convdiv)
1194 {
1195         unsigned long *i, *min, *max;
1196         int vleft, first = 1, err = 0;
1197         size_t left;
1198         char *p;
1199
1200         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1201                 *lenp = 0;
1202                 return 0;
1203         }
1204
1205         i = (unsigned long *) data;
1206         min = (unsigned long *) table->extra1;
1207         max = (unsigned long *) table->extra2;
1208         vleft = table->maxlen / sizeof(unsigned long);
1209         left = *lenp;
1210
1211         if (write) {
1212                 if (proc_first_pos_non_zero_ignore(ppos, table))
1213                         goto out;
1214
1215                 if (left > PAGE_SIZE - 1)
1216                         left = PAGE_SIZE - 1;
1217                 p = buffer;
1218         }
1219
1220         for (; left && vleft--; i++, first = 0) {
1221                 unsigned long val;
1222
1223                 if (write) {
1224                         bool neg;
1225
1226                         left -= proc_skip_spaces(&p);
1227                         if (!left)
1228                                 break;
1229
1230                         err = proc_get_long(&p, &left, &val, &neg,
1231                                              proc_wspace_sep,
1232                                              sizeof(proc_wspace_sep), NULL);
1233                         if (err)
1234                                 break;
1235                         if (neg)
1236                                 continue;
1237                         val = convmul * val / convdiv;
1238                         if ((min && val < *min) || (max && val > *max)) {
1239                                 err = -EINVAL;
1240                                 break;
1241                         }
1242                         *i = val;
1243                 } else {
1244                         val = convdiv * (*i) / convmul;
1245                         if (!first)
1246                                 proc_put_char(&buffer, &left, '\t');
1247                         proc_put_long(&buffer, &left, val, false);
1248                 }
1249         }
1250
1251         if (!write && !first && left && !err)
1252                 proc_put_char(&buffer, &left, '\n');
1253         if (write && !err)
1254                 left -= proc_skip_spaces(&p);
1255         if (write && first)
1256                 return err ? : -EINVAL;
1257         *lenp -= left;
1258 out:
1259         *ppos += *lenp;
1260         return err;
1261 }
1262
1263 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1264                 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1265                 unsigned long convdiv)
1266 {
1267         return __do_proc_doulongvec_minmax(table->data, table, write,
1268                         buffer, lenp, ppos, convmul, convdiv);
1269 }
1270
1271 /**
1272  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1273  * @table: the sysctl table
1274  * @write: %TRUE if this is a write to the sysctl file
1275  * @buffer: the user buffer
1276  * @lenp: the size of the user buffer
1277  * @ppos: file position
1278  *
1279  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1280  * values from/to the user buffer, treated as an ASCII string.
1281  *
1282  * This routine will ensure the values are within the range specified by
1283  * table->extra1 (min) and table->extra2 (max).
1284  *
1285  * Returns 0 on success.
1286  */
1287 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1288                            void *buffer, size_t *lenp, loff_t *ppos)
1289 {
1290     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1291 }
1292
1293 /**
1294  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1295  * @table: the sysctl table
1296  * @write: %TRUE if this is a write to the sysctl file
1297  * @buffer: the user buffer
1298  * @lenp: the size of the user buffer
1299  * @ppos: file position
1300  *
1301  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1302  * values from/to the user buffer, treated as an ASCII string. The values
1303  * are treated as milliseconds, and converted to jiffies when they are stored.
1304  *
1305  * This routine will ensure the values are within the range specified by
1306  * table->extra1 (min) and table->extra2 (max).
1307  *
1308  * Returns 0 on success.
1309  */
1310 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1311                                       void *buffer, size_t *lenp, loff_t *ppos)
1312 {
1313     return do_proc_doulongvec_minmax(table, write, buffer,
1314                                      lenp, ppos, HZ, 1000l);
1315 }
1316
1317
1318 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1319                                          int *valp,
1320                                          int write, void *data)
1321 {
1322         if (write) {
1323                 if (*lvalp > INT_MAX / HZ)
1324                         return 1;
1325                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1326         } else {
1327                 int val = *valp;
1328                 unsigned long lval;
1329                 if (val < 0) {
1330                         *negp = true;
1331                         lval = -(unsigned long)val;
1332                 } else {
1333                         *negp = false;
1334                         lval = (unsigned long)val;
1335                 }
1336                 *lvalp = lval / HZ;
1337         }
1338         return 0;
1339 }
1340
1341 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1342                                                 int *valp,
1343                                                 int write, void *data)
1344 {
1345         if (write) {
1346                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1347                         return 1;
1348                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1349         } else {
1350                 int val = *valp;
1351                 unsigned long lval;
1352                 if (val < 0) {
1353                         *negp = true;
1354                         lval = -(unsigned long)val;
1355                 } else {
1356                         *negp = false;
1357                         lval = (unsigned long)val;
1358                 }
1359                 *lvalp = jiffies_to_clock_t(lval);
1360         }
1361         return 0;
1362 }
1363
1364 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1365                                             int *valp,
1366                                             int write, void *data)
1367 {
1368         if (write) {
1369                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1370
1371                 if (jif > INT_MAX)
1372                         return 1;
1373                 *valp = (int)jif;
1374         } else {
1375                 int val = *valp;
1376                 unsigned long lval;
1377                 if (val < 0) {
1378                         *negp = true;
1379                         lval = -(unsigned long)val;
1380                 } else {
1381                         *negp = false;
1382                         lval = (unsigned long)val;
1383                 }
1384                 *lvalp = jiffies_to_msecs(lval);
1385         }
1386         return 0;
1387 }
1388
1389 /**
1390  * proc_dointvec_jiffies - read a vector of integers as seconds
1391  * @table: the sysctl table
1392  * @write: %TRUE if this is a write to the sysctl file
1393  * @buffer: the user buffer
1394  * @lenp: the size of the user buffer
1395  * @ppos: file position
1396  *
1397  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1398  * values from/to the user buffer, treated as an ASCII string.
1399  * The values read are assumed to be in seconds, and are converted into
1400  * jiffies.
1401  *
1402  * Returns 0 on success.
1403  */
1404 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1405                           void *buffer, size_t *lenp, loff_t *ppos)
1406 {
1407     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1408                             do_proc_dointvec_jiffies_conv,NULL);
1409 }
1410
1411 /**
1412  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1413  * @table: the sysctl table
1414  * @write: %TRUE if this is a write to the sysctl file
1415  * @buffer: the user buffer
1416  * @lenp: the size of the user buffer
1417  * @ppos: pointer to the file position
1418  *
1419  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1420  * values from/to the user buffer, treated as an ASCII string.
1421  * The values read are assumed to be in 1/USER_HZ seconds, and
1422  * are converted into jiffies.
1423  *
1424  * Returns 0 on success.
1425  */
1426 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1427                                  void *buffer, size_t *lenp, loff_t *ppos)
1428 {
1429     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1430                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1431 }
1432
1433 /**
1434  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1435  * @table: the sysctl table
1436  * @write: %TRUE if this is a write to the sysctl file
1437  * @buffer: the user buffer
1438  * @lenp: the size of the user buffer
1439  * @ppos: file position
1440  * @ppos: the current position in the file
1441  *
1442  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1443  * values from/to the user buffer, treated as an ASCII string.
1444  * The values read are assumed to be in 1/1000 seconds, and
1445  * are converted into jiffies.
1446  *
1447  * Returns 0 on success.
1448  */
1449 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1450                 size_t *lenp, loff_t *ppos)
1451 {
1452         return do_proc_dointvec(table, write, buffer, lenp, ppos,
1453                                 do_proc_dointvec_ms_jiffies_conv, NULL);
1454 }
1455
1456 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1457                 size_t *lenp, loff_t *ppos)
1458 {
1459         struct pid *new_pid;
1460         pid_t tmp;
1461         int r;
1462
1463         tmp = pid_vnr(cad_pid);
1464
1465         r = __do_proc_dointvec(&tmp, table, write, buffer,
1466                                lenp, ppos, NULL, NULL);
1467         if (r || !write)
1468                 return r;
1469
1470         new_pid = find_get_pid(tmp);
1471         if (!new_pid)
1472                 return -ESRCH;
1473
1474         put_pid(xchg(&cad_pid, new_pid));
1475         return 0;
1476 }
1477
1478 /**
1479  * proc_do_large_bitmap - read/write from/to a large bitmap
1480  * @table: the sysctl table
1481  * @write: %TRUE if this is a write to the sysctl file
1482  * @buffer: the user buffer
1483  * @lenp: the size of the user buffer
1484  * @ppos: file position
1485  *
1486  * The bitmap is stored at table->data and the bitmap length (in bits)
1487  * in table->maxlen.
1488  *
1489  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1490  * large bitmaps may be represented in a compact manner. Writing into
1491  * the file will clear the bitmap then update it with the given input.
1492  *
1493  * Returns 0 on success.
1494  */
1495 int proc_do_large_bitmap(struct ctl_table *table, int write,
1496                          void *buffer, size_t *lenp, loff_t *ppos)
1497 {
1498         int err = 0;
1499         size_t left = *lenp;
1500         unsigned long bitmap_len = table->maxlen;
1501         unsigned long *bitmap = *(unsigned long **) table->data;
1502         unsigned long *tmp_bitmap = NULL;
1503         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1504
1505         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1506                 *lenp = 0;
1507                 return 0;
1508         }
1509
1510         if (write) {
1511                 char *p = buffer;
1512                 size_t skipped = 0;
1513
1514                 if (left > PAGE_SIZE - 1) {
1515                         left = PAGE_SIZE - 1;
1516                         /* How much of the buffer we'll skip this pass */
1517                         skipped = *lenp - left;
1518                 }
1519
1520                 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1521                 if (!tmp_bitmap)
1522                         return -ENOMEM;
1523                 proc_skip_char(&p, &left, '\n');
1524                 while (!err && left) {
1525                         unsigned long val_a, val_b;
1526                         bool neg;
1527                         size_t saved_left;
1528
1529                         /* In case we stop parsing mid-number, we can reset */
1530                         saved_left = left;
1531                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1532                                              sizeof(tr_a), &c);
1533                         /*
1534                          * If we consumed the entirety of a truncated buffer or
1535                          * only one char is left (may be a "-"), then stop here,
1536                          * reset, & come back for more.
1537                          */
1538                         if ((left <= 1) && skipped) {
1539                                 left = saved_left;
1540                                 break;
1541                         }
1542
1543                         if (err)
1544                                 break;
1545                         if (val_a >= bitmap_len || neg) {
1546                                 err = -EINVAL;
1547                                 break;
1548                         }
1549
1550                         val_b = val_a;
1551                         if (left) {
1552                                 p++;
1553                                 left--;
1554                         }
1555
1556                         if (c == '-') {
1557                                 err = proc_get_long(&p, &left, &val_b,
1558                                                      &neg, tr_b, sizeof(tr_b),
1559                                                      &c);
1560                                 /*
1561                                  * If we consumed all of a truncated buffer or
1562                                  * then stop here, reset, & come back for more.
1563                                  */
1564                                 if (!left && skipped) {
1565                                         left = saved_left;
1566                                         break;
1567                                 }
1568
1569                                 if (err)
1570                                         break;
1571                                 if (val_b >= bitmap_len || neg ||
1572                                     val_a > val_b) {
1573                                         err = -EINVAL;
1574                                         break;
1575                                 }
1576                                 if (left) {
1577                                         p++;
1578                                         left--;
1579                                 }
1580                         }
1581
1582                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1583                         proc_skip_char(&p, &left, '\n');
1584                 }
1585                 left += skipped;
1586         } else {
1587                 unsigned long bit_a, bit_b = 0;
1588                 bool first = 1;
1589
1590                 while (left) {
1591                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1592                         if (bit_a >= bitmap_len)
1593                                 break;
1594                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
1595                                                    bit_a + 1) - 1;
1596
1597                         if (!first)
1598                                 proc_put_char(&buffer, &left, ',');
1599                         proc_put_long(&buffer, &left, bit_a, false);
1600                         if (bit_a != bit_b) {
1601                                 proc_put_char(&buffer, &left, '-');
1602                                 proc_put_long(&buffer, &left, bit_b, false);
1603                         }
1604
1605                         first = 0; bit_b++;
1606                 }
1607                 proc_put_char(&buffer, &left, '\n');
1608         }
1609
1610         if (!err) {
1611                 if (write) {
1612                         if (*ppos)
1613                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1614                         else
1615                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1616                 }
1617                 *lenp -= left;
1618                 *ppos += *lenp;
1619         }
1620
1621         bitmap_free(tmp_bitmap);
1622         return err;
1623 }
1624
1625 #else /* CONFIG_PROC_SYSCTL */
1626
1627 int proc_dostring(struct ctl_table *table, int write,
1628                   void *buffer, size_t *lenp, loff_t *ppos)
1629 {
1630         return -ENOSYS;
1631 }
1632
1633 int proc_dointvec(struct ctl_table *table, int write,
1634                   void *buffer, size_t *lenp, loff_t *ppos)
1635 {
1636         return -ENOSYS;
1637 }
1638
1639 int proc_douintvec(struct ctl_table *table, int write,
1640                   void *buffer, size_t *lenp, loff_t *ppos)
1641 {
1642         return -ENOSYS;
1643 }
1644
1645 int proc_dointvec_minmax(struct ctl_table *table, int write,
1646                     void *buffer, size_t *lenp, loff_t *ppos)
1647 {
1648         return -ENOSYS;
1649 }
1650
1651 int proc_douintvec_minmax(struct ctl_table *table, int write,
1652                           void *buffer, size_t *lenp, loff_t *ppos)
1653 {
1654         return -ENOSYS;
1655 }
1656
1657 int proc_dou8vec_minmax(struct ctl_table *table, int write,
1658                         void *buffer, size_t *lenp, loff_t *ppos)
1659 {
1660         return -ENOSYS;
1661 }
1662
1663 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1664                     void *buffer, size_t *lenp, loff_t *ppos)
1665 {
1666         return -ENOSYS;
1667 }
1668
1669 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1670                     void *buffer, size_t *lenp, loff_t *ppos)
1671 {
1672         return -ENOSYS;
1673 }
1674
1675 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1676                              void *buffer, size_t *lenp, loff_t *ppos)
1677 {
1678         return -ENOSYS;
1679 }
1680
1681 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1682                     void *buffer, size_t *lenp, loff_t *ppos)
1683 {
1684         return -ENOSYS;
1685 }
1686
1687 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1688                                       void *buffer, size_t *lenp, loff_t *ppos)
1689 {
1690         return -ENOSYS;
1691 }
1692
1693 int proc_do_large_bitmap(struct ctl_table *table, int write,
1694                          void *buffer, size_t *lenp, loff_t *ppos)
1695 {
1696         return -ENOSYS;
1697 }
1698
1699 #endif /* CONFIG_PROC_SYSCTL */
1700
1701 #if defined(CONFIG_SYSCTL)
1702 int proc_do_static_key(struct ctl_table *table, int write,
1703                        void *buffer, size_t *lenp, loff_t *ppos)
1704 {
1705         struct static_key *key = (struct static_key *)table->data;
1706         static DEFINE_MUTEX(static_key_mutex);
1707         int val, ret;
1708         struct ctl_table tmp = {
1709                 .data   = &val,
1710                 .maxlen = sizeof(val),
1711                 .mode   = table->mode,
1712                 .extra1 = SYSCTL_ZERO,
1713                 .extra2 = SYSCTL_ONE,
1714         };
1715
1716         if (write && !capable(CAP_SYS_ADMIN))
1717                 return -EPERM;
1718
1719         mutex_lock(&static_key_mutex);
1720         val = static_key_enabled(key);
1721         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1722         if (write && !ret) {
1723                 if (val)
1724                         static_key_enable(key);
1725                 else
1726                         static_key_disable(key);
1727         }
1728         mutex_unlock(&static_key_mutex);
1729         return ret;
1730 }
1731
1732 static struct ctl_table kern_table[] = {
1733         {
1734                 .procname       = "sched_child_runs_first",
1735                 .data           = &sysctl_sched_child_runs_first,
1736                 .maxlen         = sizeof(unsigned int),
1737                 .mode           = 0644,
1738                 .proc_handler   = proc_dointvec,
1739         },
1740 #ifdef CONFIG_SCHEDSTATS
1741         {
1742                 .procname       = "sched_schedstats",
1743                 .data           = NULL,
1744                 .maxlen         = sizeof(unsigned int),
1745                 .mode           = 0644,
1746                 .proc_handler   = sysctl_schedstats,
1747                 .extra1         = SYSCTL_ZERO,
1748                 .extra2         = SYSCTL_ONE,
1749         },
1750 #endif /* CONFIG_SCHEDSTATS */
1751 #ifdef CONFIG_TASK_DELAY_ACCT
1752         {
1753                 .procname       = "task_delayacct",
1754                 .data           = NULL,
1755                 .maxlen         = sizeof(unsigned int),
1756                 .mode           = 0644,
1757                 .proc_handler   = sysctl_delayacct,
1758                 .extra1         = SYSCTL_ZERO,
1759                 .extra2         = SYSCTL_ONE,
1760         },
1761 #endif /* CONFIG_TASK_DELAY_ACCT */
1762 #ifdef CONFIG_NUMA_BALANCING
1763         {
1764                 .procname       = "numa_balancing",
1765                 .data           = NULL, /* filled in by handler */
1766                 .maxlen         = sizeof(unsigned int),
1767                 .mode           = 0644,
1768                 .proc_handler   = sysctl_numa_balancing,
1769                 .extra1         = SYSCTL_ZERO,
1770                 .extra2         = SYSCTL_ONE,
1771         },
1772 #endif /* CONFIG_NUMA_BALANCING */
1773         {
1774                 .procname       = "sched_rt_period_us",
1775                 .data           = &sysctl_sched_rt_period,
1776                 .maxlen         = sizeof(unsigned int),
1777                 .mode           = 0644,
1778                 .proc_handler   = sched_rt_handler,
1779         },
1780         {
1781                 .procname       = "sched_rt_runtime_us",
1782                 .data           = &sysctl_sched_rt_runtime,
1783                 .maxlen         = sizeof(int),
1784                 .mode           = 0644,
1785                 .proc_handler   = sched_rt_handler,
1786         },
1787         {
1788                 .procname       = "sched_deadline_period_max_us",
1789                 .data           = &sysctl_sched_dl_period_max,
1790                 .maxlen         = sizeof(unsigned int),
1791                 .mode           = 0644,
1792                 .proc_handler   = proc_dointvec,
1793         },
1794         {
1795                 .procname       = "sched_deadline_period_min_us",
1796                 .data           = &sysctl_sched_dl_period_min,
1797                 .maxlen         = sizeof(unsigned int),
1798                 .mode           = 0644,
1799                 .proc_handler   = proc_dointvec,
1800         },
1801         {
1802                 .procname       = "sched_rr_timeslice_ms",
1803                 .data           = &sysctl_sched_rr_timeslice,
1804                 .maxlen         = sizeof(int),
1805                 .mode           = 0644,
1806                 .proc_handler   = sched_rr_handler,
1807         },
1808 #ifdef CONFIG_UCLAMP_TASK
1809         {
1810                 .procname       = "sched_util_clamp_min",
1811                 .data           = &sysctl_sched_uclamp_util_min,
1812                 .maxlen         = sizeof(unsigned int),
1813                 .mode           = 0644,
1814                 .proc_handler   = sysctl_sched_uclamp_handler,
1815         },
1816         {
1817                 .procname       = "sched_util_clamp_max",
1818                 .data           = &sysctl_sched_uclamp_util_max,
1819                 .maxlen         = sizeof(unsigned int),
1820                 .mode           = 0644,
1821                 .proc_handler   = sysctl_sched_uclamp_handler,
1822         },
1823         {
1824                 .procname       = "sched_util_clamp_min_rt_default",
1825                 .data           = &sysctl_sched_uclamp_util_min_rt_default,
1826                 .maxlen         = sizeof(unsigned int),
1827                 .mode           = 0644,
1828                 .proc_handler   = sysctl_sched_uclamp_handler,
1829         },
1830 #endif
1831 #ifdef CONFIG_SCHED_AUTOGROUP
1832         {
1833                 .procname       = "sched_autogroup_enabled",
1834                 .data           = &sysctl_sched_autogroup_enabled,
1835                 .maxlen         = sizeof(unsigned int),
1836                 .mode           = 0644,
1837                 .proc_handler   = proc_dointvec_minmax,
1838                 .extra1         = SYSCTL_ZERO,
1839                 .extra2         = SYSCTL_ONE,
1840         },
1841 #endif
1842 #ifdef CONFIG_CFS_BANDWIDTH
1843         {
1844                 .procname       = "sched_cfs_bandwidth_slice_us",
1845                 .data           = &sysctl_sched_cfs_bandwidth_slice,
1846                 .maxlen         = sizeof(unsigned int),
1847                 .mode           = 0644,
1848                 .proc_handler   = proc_dointvec_minmax,
1849                 .extra1         = SYSCTL_ONE,
1850         },
1851 #endif
1852 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1853         {
1854                 .procname       = "sched_energy_aware",
1855                 .data           = &sysctl_sched_energy_aware,
1856                 .maxlen         = sizeof(unsigned int),
1857                 .mode           = 0644,
1858                 .proc_handler   = sched_energy_aware_handler,
1859                 .extra1         = SYSCTL_ZERO,
1860                 .extra2         = SYSCTL_ONE,
1861         },
1862 #endif
1863 #ifdef CONFIG_PROVE_LOCKING
1864         {
1865                 .procname       = "prove_locking",
1866                 .data           = &prove_locking,
1867                 .maxlen         = sizeof(int),
1868                 .mode           = 0644,
1869                 .proc_handler   = proc_dointvec,
1870         },
1871 #endif
1872 #ifdef CONFIG_LOCK_STAT
1873         {
1874                 .procname       = "lock_stat",
1875                 .data           = &lock_stat,
1876                 .maxlen         = sizeof(int),
1877                 .mode           = 0644,
1878                 .proc_handler   = proc_dointvec,
1879         },
1880 #endif
1881         {
1882                 .procname       = "panic",
1883                 .data           = &panic_timeout,
1884                 .maxlen         = sizeof(int),
1885                 .mode           = 0644,
1886                 .proc_handler   = proc_dointvec,
1887         },
1888 #ifdef CONFIG_COREDUMP
1889         {
1890                 .procname       = "core_uses_pid",
1891                 .data           = &core_uses_pid,
1892                 .maxlen         = sizeof(int),
1893                 .mode           = 0644,
1894                 .proc_handler   = proc_dointvec,
1895         },
1896         {
1897                 .procname       = "core_pattern",
1898                 .data           = core_pattern,
1899                 .maxlen         = CORENAME_MAX_SIZE,
1900                 .mode           = 0644,
1901                 .proc_handler   = proc_dostring_coredump,
1902         },
1903         {
1904                 .procname       = "core_pipe_limit",
1905                 .data           = &core_pipe_limit,
1906                 .maxlen         = sizeof(unsigned int),
1907                 .mode           = 0644,
1908                 .proc_handler   = proc_dointvec,
1909         },
1910 #endif
1911 #ifdef CONFIG_PROC_SYSCTL
1912         {
1913                 .procname       = "tainted",
1914                 .maxlen         = sizeof(long),
1915                 .mode           = 0644,
1916                 .proc_handler   = proc_taint,
1917         },
1918         {
1919                 .procname       = "sysctl_writes_strict",
1920                 .data           = &sysctl_writes_strict,
1921                 .maxlen         = sizeof(int),
1922                 .mode           = 0644,
1923                 .proc_handler   = proc_dointvec_minmax,
1924                 .extra1         = &neg_one,
1925                 .extra2         = SYSCTL_ONE,
1926         },
1927 #endif
1928 #ifdef CONFIG_LATENCYTOP
1929         {
1930                 .procname       = "latencytop",
1931                 .data           = &latencytop_enabled,
1932                 .maxlen         = sizeof(int),
1933                 .mode           = 0644,
1934                 .proc_handler   = sysctl_latencytop,
1935         },
1936 #endif
1937 #ifdef CONFIG_BLK_DEV_INITRD
1938         {
1939                 .procname       = "real-root-dev",
1940                 .data           = &real_root_dev,
1941                 .maxlen         = sizeof(int),
1942                 .mode           = 0644,
1943                 .proc_handler   = proc_dointvec,
1944         },
1945 #endif
1946         {
1947                 .procname       = "print-fatal-signals",
1948                 .data           = &print_fatal_signals,
1949                 .maxlen         = sizeof(int),
1950                 .mode           = 0644,
1951                 .proc_handler   = proc_dointvec,
1952         },
1953 #ifdef CONFIG_SPARC
1954         {
1955                 .procname       = "reboot-cmd",
1956                 .data           = reboot_command,
1957                 .maxlen         = 256,
1958                 .mode           = 0644,
1959                 .proc_handler   = proc_dostring,
1960         },
1961         {
1962                 .procname       = "stop-a",
1963                 .data           = &stop_a_enabled,
1964                 .maxlen         = sizeof (int),
1965                 .mode           = 0644,
1966                 .proc_handler   = proc_dointvec,
1967         },
1968         {
1969                 .procname       = "scons-poweroff",
1970                 .data           = &scons_pwroff,
1971                 .maxlen         = sizeof (int),
1972                 .mode           = 0644,
1973                 .proc_handler   = proc_dointvec,
1974         },
1975 #endif
1976 #ifdef CONFIG_SPARC64
1977         {
1978                 .procname       = "tsb-ratio",
1979                 .data           = &sysctl_tsb_ratio,
1980                 .maxlen         = sizeof (int),
1981                 .mode           = 0644,
1982                 .proc_handler   = proc_dointvec,
1983         },
1984 #endif
1985 #ifdef CONFIG_PARISC
1986         {
1987                 .procname       = "soft-power",
1988                 .data           = &pwrsw_enabled,
1989                 .maxlen         = sizeof (int),
1990                 .mode           = 0644,
1991                 .proc_handler   = proc_dointvec,
1992         },
1993 #endif
1994 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1995         {
1996                 .procname       = "unaligned-trap",
1997                 .data           = &unaligned_enabled,
1998                 .maxlen         = sizeof (int),
1999                 .mode           = 0644,
2000                 .proc_handler   = proc_dointvec,
2001         },
2002 #endif
2003         {
2004                 .procname       = "ctrl-alt-del",
2005                 .data           = &C_A_D,
2006                 .maxlen         = sizeof(int),
2007                 .mode           = 0644,
2008                 .proc_handler   = proc_dointvec,
2009         },
2010 #ifdef CONFIG_FUNCTION_TRACER
2011         {
2012                 .procname       = "ftrace_enabled",
2013                 .data           = &ftrace_enabled,
2014                 .maxlen         = sizeof(int),
2015                 .mode           = 0644,
2016                 .proc_handler   = ftrace_enable_sysctl,
2017         },
2018 #endif
2019 #ifdef CONFIG_STACK_TRACER
2020         {
2021                 .procname       = "stack_tracer_enabled",
2022                 .data           = &stack_tracer_enabled,
2023                 .maxlen         = sizeof(int),
2024                 .mode           = 0644,
2025                 .proc_handler   = stack_trace_sysctl,
2026         },
2027 #endif
2028 #ifdef CONFIG_TRACING
2029         {
2030                 .procname       = "ftrace_dump_on_oops",
2031                 .data           = &ftrace_dump_on_oops,
2032                 .maxlen         = sizeof(int),
2033                 .mode           = 0644,
2034                 .proc_handler   = proc_dointvec,
2035         },
2036         {
2037                 .procname       = "traceoff_on_warning",
2038                 .data           = &__disable_trace_on_warning,
2039                 .maxlen         = sizeof(__disable_trace_on_warning),
2040                 .mode           = 0644,
2041                 .proc_handler   = proc_dointvec,
2042         },
2043         {
2044                 .procname       = "tracepoint_printk",
2045                 .data           = &tracepoint_printk,
2046                 .maxlen         = sizeof(tracepoint_printk),
2047                 .mode           = 0644,
2048                 .proc_handler   = tracepoint_printk_sysctl,
2049         },
2050 #endif
2051 #ifdef CONFIG_KEXEC_CORE
2052         {
2053                 .procname       = "kexec_load_disabled",
2054                 .data           = &kexec_load_disabled,
2055                 .maxlen         = sizeof(int),
2056                 .mode           = 0644,
2057                 /* only handle a transition from default "0" to "1" */
2058                 .proc_handler   = proc_dointvec_minmax,
2059                 .extra1         = SYSCTL_ONE,
2060                 .extra2         = SYSCTL_ONE,
2061         },
2062 #endif
2063 #ifdef CONFIG_MODULES
2064         {
2065                 .procname       = "modprobe",
2066                 .data           = &modprobe_path,
2067                 .maxlen         = KMOD_PATH_LEN,
2068                 .mode           = 0644,
2069                 .proc_handler   = proc_dostring,
2070         },
2071         {
2072                 .procname       = "modules_disabled",
2073                 .data           = &modules_disabled,
2074                 .maxlen         = sizeof(int),
2075                 .mode           = 0644,
2076                 /* only handle a transition from default "0" to "1" */
2077                 .proc_handler   = proc_dointvec_minmax,
2078                 .extra1         = SYSCTL_ONE,
2079                 .extra2         = SYSCTL_ONE,
2080         },
2081 #endif
2082 #ifdef CONFIG_UEVENT_HELPER
2083         {
2084                 .procname       = "hotplug",
2085                 .data           = &uevent_helper,
2086                 .maxlen         = UEVENT_HELPER_PATH_LEN,
2087                 .mode           = 0644,
2088                 .proc_handler   = proc_dostring,
2089         },
2090 #endif
2091 #ifdef CONFIG_CHR_DEV_SG
2092         {
2093                 .procname       = "sg-big-buff",
2094                 .data           = &sg_big_buff,
2095                 .maxlen         = sizeof (int),
2096                 .mode           = 0444,
2097                 .proc_handler   = proc_dointvec,
2098         },
2099 #endif
2100 #ifdef CONFIG_BSD_PROCESS_ACCT
2101         {
2102                 .procname       = "acct",
2103                 .data           = &acct_parm,
2104                 .maxlen         = 3*sizeof(int),
2105                 .mode           = 0644,
2106                 .proc_handler   = proc_dointvec,
2107         },
2108 #endif
2109 #ifdef CONFIG_MAGIC_SYSRQ
2110         {
2111                 .procname       = "sysrq",
2112                 .data           = NULL,
2113                 .maxlen         = sizeof (int),
2114                 .mode           = 0644,
2115                 .proc_handler   = sysrq_sysctl_handler,
2116         },
2117 #endif
2118 #ifdef CONFIG_PROC_SYSCTL
2119         {
2120                 .procname       = "cad_pid",
2121                 .data           = NULL,
2122                 .maxlen         = sizeof (int),
2123                 .mode           = 0600,
2124                 .proc_handler   = proc_do_cad_pid,
2125         },
2126 #endif
2127         {
2128                 .procname       = "threads-max",
2129                 .data           = NULL,
2130                 .maxlen         = sizeof(int),
2131                 .mode           = 0644,
2132                 .proc_handler   = sysctl_max_threads,
2133         },
2134         {
2135                 .procname       = "random",
2136                 .mode           = 0555,
2137                 .child          = random_table,
2138         },
2139         {
2140                 .procname       = "usermodehelper",
2141                 .mode           = 0555,
2142                 .child          = usermodehelper_table,
2143         },
2144 #ifdef CONFIG_FW_LOADER_USER_HELPER
2145         {
2146                 .procname       = "firmware_config",
2147                 .mode           = 0555,
2148                 .child          = firmware_config_table,
2149         },
2150 #endif
2151         {
2152                 .procname       = "overflowuid",
2153                 .data           = &overflowuid,
2154                 .maxlen         = sizeof(int),
2155                 .mode           = 0644,
2156                 .proc_handler   = proc_dointvec_minmax,
2157                 .extra1         = &minolduid,
2158                 .extra2         = &maxolduid,
2159         },
2160         {
2161                 .procname       = "overflowgid",
2162                 .data           = &overflowgid,
2163                 .maxlen         = sizeof(int),
2164                 .mode           = 0644,
2165                 .proc_handler   = proc_dointvec_minmax,
2166                 .extra1         = &minolduid,
2167                 .extra2         = &maxolduid,
2168         },
2169 #ifdef CONFIG_S390
2170         {
2171                 .procname       = "userprocess_debug",
2172                 .data           = &show_unhandled_signals,
2173                 .maxlen         = sizeof(int),
2174                 .mode           = 0644,
2175                 .proc_handler   = proc_dointvec,
2176         },
2177 #endif
2178 #ifdef CONFIG_SMP
2179         {
2180                 .procname       = "oops_all_cpu_backtrace",
2181                 .data           = &sysctl_oops_all_cpu_backtrace,
2182                 .maxlen         = sizeof(int),
2183                 .mode           = 0644,
2184                 .proc_handler   = proc_dointvec_minmax,
2185                 .extra1         = SYSCTL_ZERO,
2186                 .extra2         = SYSCTL_ONE,
2187         },
2188 #endif /* CONFIG_SMP */
2189         {
2190                 .procname       = "pid_max",
2191                 .data           = &pid_max,
2192                 .maxlen         = sizeof (int),
2193                 .mode           = 0644,
2194                 .proc_handler   = proc_dointvec_minmax,
2195                 .extra1         = &pid_max_min,
2196                 .extra2         = &pid_max_max,
2197         },
2198         {
2199                 .procname       = "panic_on_oops",
2200                 .data           = &panic_on_oops,
2201                 .maxlen         = sizeof(int),
2202                 .mode           = 0644,
2203                 .proc_handler   = proc_dointvec,
2204         },
2205         {
2206                 .procname       = "panic_print",
2207                 .data           = &panic_print,
2208                 .maxlen         = sizeof(unsigned long),
2209                 .mode           = 0644,
2210                 .proc_handler   = proc_doulongvec_minmax,
2211         },
2212 #if defined CONFIG_PRINTK
2213         {
2214                 .procname       = "printk",
2215                 .data           = &console_loglevel,
2216                 .maxlen         = 4*sizeof(int),
2217                 .mode           = 0644,
2218                 .proc_handler   = proc_dointvec,
2219         },
2220         {
2221                 .procname       = "printk_ratelimit",
2222                 .data           = &printk_ratelimit_state.interval,
2223                 .maxlen         = sizeof(int),
2224                 .mode           = 0644,
2225                 .proc_handler   = proc_dointvec_jiffies,
2226         },
2227         {
2228                 .procname       = "printk_ratelimit_burst",
2229                 .data           = &printk_ratelimit_state.burst,
2230                 .maxlen         = sizeof(int),
2231                 .mode           = 0644,
2232                 .proc_handler   = proc_dointvec,
2233         },
2234         {
2235                 .procname       = "printk_delay",
2236                 .data           = &printk_delay_msec,
2237                 .maxlen         = sizeof(int),
2238                 .mode           = 0644,
2239                 .proc_handler   = proc_dointvec_minmax,
2240                 .extra1         = SYSCTL_ZERO,
2241                 .extra2         = &ten_thousand,
2242         },
2243         {
2244                 .procname       = "printk_devkmsg",
2245                 .data           = devkmsg_log_str,
2246                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
2247                 .mode           = 0644,
2248                 .proc_handler   = devkmsg_sysctl_set_loglvl,
2249         },
2250         {
2251                 .procname       = "dmesg_restrict",
2252                 .data           = &dmesg_restrict,
2253                 .maxlen         = sizeof(int),
2254                 .mode           = 0644,
2255                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2256                 .extra1         = SYSCTL_ZERO,
2257                 .extra2         = SYSCTL_ONE,
2258         },
2259         {
2260                 .procname       = "kptr_restrict",
2261                 .data           = &kptr_restrict,
2262                 .maxlen         = sizeof(int),
2263                 .mode           = 0644,
2264                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2265                 .extra1         = SYSCTL_ZERO,
2266                 .extra2         = &two,
2267         },
2268 #endif
2269         {
2270                 .procname       = "ngroups_max",
2271                 .data           = &ngroups_max,
2272                 .maxlen         = sizeof (int),
2273                 .mode           = 0444,
2274                 .proc_handler   = proc_dointvec,
2275         },
2276         {
2277                 .procname       = "cap_last_cap",
2278                 .data           = (void *)&cap_last_cap,
2279                 .maxlen         = sizeof(int),
2280                 .mode           = 0444,
2281                 .proc_handler   = proc_dointvec,
2282         },
2283 #if defined(CONFIG_LOCKUP_DETECTOR)
2284         {
2285                 .procname       = "watchdog",
2286                 .data           = &watchdog_user_enabled,
2287                 .maxlen         = sizeof(int),
2288                 .mode           = 0644,
2289                 .proc_handler   = proc_watchdog,
2290                 .extra1         = SYSCTL_ZERO,
2291                 .extra2         = SYSCTL_ONE,
2292         },
2293         {
2294                 .procname       = "watchdog_thresh",
2295                 .data           = &watchdog_thresh,
2296                 .maxlen         = sizeof(int),
2297                 .mode           = 0644,
2298                 .proc_handler   = proc_watchdog_thresh,
2299                 .extra1         = SYSCTL_ZERO,
2300                 .extra2         = &sixty,
2301         },
2302         {
2303                 .procname       = "nmi_watchdog",
2304                 .data           = &nmi_watchdog_user_enabled,
2305                 .maxlen         = sizeof(int),
2306                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
2307                 .proc_handler   = proc_nmi_watchdog,
2308                 .extra1         = SYSCTL_ZERO,
2309                 .extra2         = SYSCTL_ONE,
2310         },
2311         {
2312                 .procname       = "watchdog_cpumask",
2313                 .data           = &watchdog_cpumask_bits,
2314                 .maxlen         = NR_CPUS,
2315                 .mode           = 0644,
2316                 .proc_handler   = proc_watchdog_cpumask,
2317         },
2318 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2319         {
2320                 .procname       = "soft_watchdog",
2321                 .data           = &soft_watchdog_user_enabled,
2322                 .maxlen         = sizeof(int),
2323                 .mode           = 0644,
2324                 .proc_handler   = proc_soft_watchdog,
2325                 .extra1         = SYSCTL_ZERO,
2326                 .extra2         = SYSCTL_ONE,
2327         },
2328         {
2329                 .procname       = "softlockup_panic",
2330                 .data           = &softlockup_panic,
2331                 .maxlen         = sizeof(int),
2332                 .mode           = 0644,
2333                 .proc_handler   = proc_dointvec_minmax,
2334                 .extra1         = SYSCTL_ZERO,
2335                 .extra2         = SYSCTL_ONE,
2336         },
2337 #ifdef CONFIG_SMP
2338         {
2339                 .procname       = "softlockup_all_cpu_backtrace",
2340                 .data           = &sysctl_softlockup_all_cpu_backtrace,
2341                 .maxlen         = sizeof(int),
2342                 .mode           = 0644,
2343                 .proc_handler   = proc_dointvec_minmax,
2344                 .extra1         = SYSCTL_ZERO,
2345                 .extra2         = SYSCTL_ONE,
2346         },
2347 #endif /* CONFIG_SMP */
2348 #endif
2349 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2350         {
2351                 .procname       = "hardlockup_panic",
2352                 .data           = &hardlockup_panic,
2353                 .maxlen         = sizeof(int),
2354                 .mode           = 0644,
2355                 .proc_handler   = proc_dointvec_minmax,
2356                 .extra1         = SYSCTL_ZERO,
2357                 .extra2         = SYSCTL_ONE,
2358         },
2359 #ifdef CONFIG_SMP
2360         {
2361                 .procname       = "hardlockup_all_cpu_backtrace",
2362                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
2363                 .maxlen         = sizeof(int),
2364                 .mode           = 0644,
2365                 .proc_handler   = proc_dointvec_minmax,
2366                 .extra1         = SYSCTL_ZERO,
2367                 .extra2         = SYSCTL_ONE,
2368         },
2369 #endif /* CONFIG_SMP */
2370 #endif
2371 #endif
2372
2373 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2374         {
2375                 .procname       = "unknown_nmi_panic",
2376                 .data           = &unknown_nmi_panic,
2377                 .maxlen         = sizeof (int),
2378                 .mode           = 0644,
2379                 .proc_handler   = proc_dointvec,
2380         },
2381 #endif
2382
2383 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2384         defined(CONFIG_DEBUG_STACKOVERFLOW)
2385         {
2386                 .procname       = "panic_on_stackoverflow",
2387                 .data           = &sysctl_panic_on_stackoverflow,
2388                 .maxlen         = sizeof(int),
2389                 .mode           = 0644,
2390                 .proc_handler   = proc_dointvec,
2391         },
2392 #endif
2393 #if defined(CONFIG_X86)
2394         {
2395                 .procname       = "panic_on_unrecovered_nmi",
2396                 .data           = &panic_on_unrecovered_nmi,
2397                 .maxlen         = sizeof(int),
2398                 .mode           = 0644,
2399                 .proc_handler   = proc_dointvec,
2400         },
2401         {
2402                 .procname       = "panic_on_io_nmi",
2403                 .data           = &panic_on_io_nmi,
2404                 .maxlen         = sizeof(int),
2405                 .mode           = 0644,
2406                 .proc_handler   = proc_dointvec,
2407         },
2408         {
2409                 .procname       = "bootloader_type",
2410                 .data           = &bootloader_type,
2411                 .maxlen         = sizeof (int),
2412                 .mode           = 0444,
2413                 .proc_handler   = proc_dointvec,
2414         },
2415         {
2416                 .procname       = "bootloader_version",
2417                 .data           = &bootloader_version,
2418                 .maxlen         = sizeof (int),
2419                 .mode           = 0444,
2420                 .proc_handler   = proc_dointvec,
2421         },
2422         {
2423                 .procname       = "io_delay_type",
2424                 .data           = &io_delay_type,
2425                 .maxlen         = sizeof(int),
2426                 .mode           = 0644,
2427                 .proc_handler   = proc_dointvec,
2428         },
2429 #endif
2430 #if defined(CONFIG_MMU)
2431         {
2432                 .procname       = "randomize_va_space",
2433                 .data           = &randomize_va_space,
2434                 .maxlen         = sizeof(int),
2435                 .mode           = 0644,
2436                 .proc_handler   = proc_dointvec,
2437         },
2438 #endif
2439 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2440         {
2441                 .procname       = "spin_retry",
2442                 .data           = &spin_retry,
2443                 .maxlen         = sizeof (int),
2444                 .mode           = 0644,
2445                 .proc_handler   = proc_dointvec,
2446         },
2447 #endif
2448 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2449         {
2450                 .procname       = "acpi_video_flags",
2451                 .data           = &acpi_realmode_flags,
2452                 .maxlen         = sizeof (unsigned long),
2453                 .mode           = 0644,
2454                 .proc_handler   = proc_doulongvec_minmax,
2455         },
2456 #endif
2457 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2458         {
2459                 .procname       = "ignore-unaligned-usertrap",
2460                 .data           = &no_unaligned_warning,
2461                 .maxlen         = sizeof (int),
2462                 .mode           = 0644,
2463                 .proc_handler   = proc_dointvec,
2464         },
2465 #endif
2466 #ifdef CONFIG_IA64
2467         {
2468                 .procname       = "unaligned-dump-stack",
2469                 .data           = &unaligned_dump_stack,
2470                 .maxlen         = sizeof (int),
2471                 .mode           = 0644,
2472                 .proc_handler   = proc_dointvec,
2473         },
2474 #endif
2475 #ifdef CONFIG_DETECT_HUNG_TASK
2476 #ifdef CONFIG_SMP
2477         {
2478                 .procname       = "hung_task_all_cpu_backtrace",
2479                 .data           = &sysctl_hung_task_all_cpu_backtrace,
2480                 .maxlen         = sizeof(int),
2481                 .mode           = 0644,
2482                 .proc_handler   = proc_dointvec_minmax,
2483                 .extra1         = SYSCTL_ZERO,
2484                 .extra2         = SYSCTL_ONE,
2485         },
2486 #endif /* CONFIG_SMP */
2487         {
2488                 .procname       = "hung_task_panic",
2489                 .data           = &sysctl_hung_task_panic,
2490                 .maxlen         = sizeof(int),
2491                 .mode           = 0644,
2492                 .proc_handler   = proc_dointvec_minmax,
2493                 .extra1         = SYSCTL_ZERO,
2494                 .extra2         = SYSCTL_ONE,
2495         },
2496         {
2497                 .procname       = "hung_task_check_count",
2498                 .data           = &sysctl_hung_task_check_count,
2499                 .maxlen         = sizeof(int),
2500                 .mode           = 0644,
2501                 .proc_handler   = proc_dointvec_minmax,
2502                 .extra1         = SYSCTL_ZERO,
2503         },
2504         {
2505                 .procname       = "hung_task_timeout_secs",
2506                 .data           = &sysctl_hung_task_timeout_secs,
2507                 .maxlen         = sizeof(unsigned long),
2508                 .mode           = 0644,
2509                 .proc_handler   = proc_dohung_task_timeout_secs,
2510                 .extra2         = &hung_task_timeout_max,
2511         },
2512         {
2513                 .procname       = "hung_task_check_interval_secs",
2514                 .data           = &sysctl_hung_task_check_interval_secs,
2515                 .maxlen         = sizeof(unsigned long),
2516                 .mode           = 0644,
2517                 .proc_handler   = proc_dohung_task_timeout_secs,
2518                 .extra2         = &hung_task_timeout_max,
2519         },
2520         {
2521                 .procname       = "hung_task_warnings",
2522                 .data           = &sysctl_hung_task_warnings,
2523                 .maxlen         = sizeof(int),
2524                 .mode           = 0644,
2525                 .proc_handler   = proc_dointvec_minmax,
2526                 .extra1         = &neg_one,
2527         },
2528 #endif
2529 #ifdef CONFIG_RT_MUTEXES
2530         {
2531                 .procname       = "max_lock_depth",
2532                 .data           = &max_lock_depth,
2533                 .maxlen         = sizeof(int),
2534                 .mode           = 0644,
2535                 .proc_handler   = proc_dointvec,
2536         },
2537 #endif
2538         {
2539                 .procname       = "poweroff_cmd",
2540                 .data           = &poweroff_cmd,
2541                 .maxlen         = POWEROFF_CMD_PATH_LEN,
2542                 .mode           = 0644,
2543                 .proc_handler   = proc_dostring,
2544         },
2545 #ifdef CONFIG_KEYS
2546         {
2547                 .procname       = "keys",
2548                 .mode           = 0555,
2549                 .child          = key_sysctls,
2550         },
2551 #endif
2552 #ifdef CONFIG_PERF_EVENTS
2553         /*
2554          * User-space scripts rely on the existence of this file
2555          * as a feature check for perf_events being enabled.
2556          *
2557          * So it's an ABI, do not remove!
2558          */
2559         {
2560                 .procname       = "perf_event_paranoid",
2561                 .data           = &sysctl_perf_event_paranoid,
2562                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
2563                 .mode           = 0644,
2564                 .proc_handler   = proc_dointvec,
2565         },
2566         {
2567                 .procname       = "perf_event_mlock_kb",
2568                 .data           = &sysctl_perf_event_mlock,
2569                 .maxlen         = sizeof(sysctl_perf_event_mlock),
2570                 .mode           = 0644,
2571                 .proc_handler   = proc_dointvec,
2572         },
2573         {
2574                 .procname       = "perf_event_max_sample_rate",
2575                 .data           = &sysctl_perf_event_sample_rate,
2576                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
2577                 .mode           = 0644,
2578                 .proc_handler   = perf_proc_update_handler,
2579                 .extra1         = SYSCTL_ONE,
2580         },
2581         {
2582                 .procname       = "perf_cpu_time_max_percent",
2583                 .data           = &sysctl_perf_cpu_time_max_percent,
2584                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
2585                 .mode           = 0644,
2586                 .proc_handler   = perf_cpu_time_max_percent_handler,
2587                 .extra1         = SYSCTL_ZERO,
2588                 .extra2         = &one_hundred,
2589         },
2590         {
2591                 .procname       = "perf_event_max_stack",
2592                 .data           = &sysctl_perf_event_max_stack,
2593                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
2594                 .mode           = 0644,
2595                 .proc_handler   = perf_event_max_stack_handler,
2596                 .extra1         = SYSCTL_ZERO,
2597                 .extra2         = &six_hundred_forty_kb,
2598         },
2599         {
2600                 .procname       = "perf_event_max_contexts_per_stack",
2601                 .data           = &sysctl_perf_event_max_contexts_per_stack,
2602                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
2603                 .mode           = 0644,
2604                 .proc_handler   = perf_event_max_stack_handler,
2605                 .extra1         = SYSCTL_ZERO,
2606                 .extra2         = &one_thousand,
2607         },
2608 #endif
2609         {
2610                 .procname       = "panic_on_warn",
2611                 .data           = &panic_on_warn,
2612                 .maxlen         = sizeof(int),
2613                 .mode           = 0644,
2614                 .proc_handler   = proc_dointvec_minmax,
2615                 .extra1         = SYSCTL_ZERO,
2616                 .extra2         = SYSCTL_ONE,
2617         },
2618 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2619         {
2620                 .procname       = "timer_migration",
2621                 .data           = &sysctl_timer_migration,
2622                 .maxlen         = sizeof(unsigned int),
2623                 .mode           = 0644,
2624                 .proc_handler   = timer_migration_handler,
2625                 .extra1         = SYSCTL_ZERO,
2626                 .extra2         = SYSCTL_ONE,
2627         },
2628 #endif
2629 #ifdef CONFIG_BPF_SYSCALL
2630         {
2631                 .procname       = "unprivileged_bpf_disabled",
2632                 .data           = &sysctl_unprivileged_bpf_disabled,
2633                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
2634                 .mode           = 0644,
2635                 .proc_handler   = bpf_unpriv_handler,
2636                 .extra1         = SYSCTL_ZERO,
2637                 .extra2         = &two,
2638         },
2639         {
2640                 .procname       = "bpf_stats_enabled",
2641                 .data           = &bpf_stats_enabled_key.key,
2642                 .maxlen         = sizeof(bpf_stats_enabled_key),
2643                 .mode           = 0644,
2644                 .proc_handler   = bpf_stats_handler,
2645         },
2646 #endif
2647 #if defined(CONFIG_TREE_RCU)
2648         {
2649                 .procname       = "panic_on_rcu_stall",
2650                 .data           = &sysctl_panic_on_rcu_stall,
2651                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
2652                 .mode           = 0644,
2653                 .proc_handler   = proc_dointvec_minmax,
2654                 .extra1         = SYSCTL_ZERO,
2655                 .extra2         = SYSCTL_ONE,
2656         },
2657 #endif
2658 #if defined(CONFIG_TREE_RCU)
2659         {
2660                 .procname       = "max_rcu_stall_to_panic",
2661                 .data           = &sysctl_max_rcu_stall_to_panic,
2662                 .maxlen         = sizeof(sysctl_max_rcu_stall_to_panic),
2663                 .mode           = 0644,
2664                 .proc_handler   = proc_dointvec_minmax,
2665                 .extra1         = SYSCTL_ONE,
2666                 .extra2         = SYSCTL_INT_MAX,
2667         },
2668 #endif
2669 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2670         {
2671                 .procname       = "stack_erasing",
2672                 .data           = NULL,
2673                 .maxlen         = sizeof(int),
2674                 .mode           = 0600,
2675                 .proc_handler   = stack_erasing_sysctl,
2676                 .extra1         = SYSCTL_ZERO,
2677                 .extra2         = SYSCTL_ONE,
2678         },
2679 #endif
2680         { }
2681 };
2682
2683 static struct ctl_table vm_table[] = {
2684         {
2685                 .procname       = "overcommit_memory",
2686                 .data           = &sysctl_overcommit_memory,
2687                 .maxlen         = sizeof(sysctl_overcommit_memory),
2688                 .mode           = 0644,
2689                 .proc_handler   = overcommit_policy_handler,
2690                 .extra1         = SYSCTL_ZERO,
2691                 .extra2         = &two,
2692         },
2693         {
2694                 .procname       = "panic_on_oom",
2695                 .data           = &sysctl_panic_on_oom,
2696                 .maxlen         = sizeof(sysctl_panic_on_oom),
2697                 .mode           = 0644,
2698                 .proc_handler   = proc_dointvec_minmax,
2699                 .extra1         = SYSCTL_ZERO,
2700                 .extra2         = &two,
2701         },
2702         {
2703                 .procname       = "oom_kill_allocating_task",
2704                 .data           = &sysctl_oom_kill_allocating_task,
2705                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
2706                 .mode           = 0644,
2707                 .proc_handler   = proc_dointvec,
2708         },
2709         {
2710                 .procname       = "oom_dump_tasks",
2711                 .data           = &sysctl_oom_dump_tasks,
2712                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
2713                 .mode           = 0644,
2714                 .proc_handler   = proc_dointvec,
2715         },
2716         {
2717                 .procname       = "overcommit_ratio",
2718                 .data           = &sysctl_overcommit_ratio,
2719                 .maxlen         = sizeof(sysctl_overcommit_ratio),
2720                 .mode           = 0644,
2721                 .proc_handler   = overcommit_ratio_handler,
2722         },
2723         {
2724                 .procname       = "overcommit_kbytes",
2725                 .data           = &sysctl_overcommit_kbytes,
2726                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
2727                 .mode           = 0644,
2728                 .proc_handler   = overcommit_kbytes_handler,
2729         },
2730         {
2731                 .procname       = "page-cluster",
2732                 .data           = &page_cluster,
2733                 .maxlen         = sizeof(int),
2734                 .mode           = 0644,
2735                 .proc_handler   = proc_dointvec_minmax,
2736                 .extra1         = SYSCTL_ZERO,
2737         },
2738         {
2739                 .procname       = "dirty_background_ratio",
2740                 .data           = &dirty_background_ratio,
2741                 .maxlen         = sizeof(dirty_background_ratio),
2742                 .mode           = 0644,
2743                 .proc_handler   = dirty_background_ratio_handler,
2744                 .extra1         = SYSCTL_ZERO,
2745                 .extra2         = &one_hundred,
2746         },
2747         {
2748                 .procname       = "dirty_background_bytes",
2749                 .data           = &dirty_background_bytes,
2750                 .maxlen         = sizeof(dirty_background_bytes),
2751                 .mode           = 0644,
2752                 .proc_handler   = dirty_background_bytes_handler,
2753                 .extra1         = &one_ul,
2754         },
2755         {
2756                 .procname       = "dirty_ratio",
2757                 .data           = &vm_dirty_ratio,
2758                 .maxlen         = sizeof(vm_dirty_ratio),
2759                 .mode           = 0644,
2760                 .proc_handler   = dirty_ratio_handler,
2761                 .extra1         = SYSCTL_ZERO,
2762                 .extra2         = &one_hundred,
2763         },
2764         {
2765                 .procname       = "dirty_bytes",
2766                 .data           = &vm_dirty_bytes,
2767                 .maxlen         = sizeof(vm_dirty_bytes),
2768                 .mode           = 0644,
2769                 .proc_handler   = dirty_bytes_handler,
2770                 .extra1         = &dirty_bytes_min,
2771         },
2772         {
2773                 .procname       = "dirty_writeback_centisecs",
2774                 .data           = &dirty_writeback_interval,
2775                 .maxlen         = sizeof(dirty_writeback_interval),
2776                 .mode           = 0644,
2777                 .proc_handler   = dirty_writeback_centisecs_handler,
2778         },
2779         {
2780                 .procname       = "dirty_expire_centisecs",
2781                 .data           = &dirty_expire_interval,
2782                 .maxlen         = sizeof(dirty_expire_interval),
2783                 .mode           = 0644,
2784                 .proc_handler   = proc_dointvec_minmax,
2785                 .extra1         = SYSCTL_ZERO,
2786         },
2787         {
2788                 .procname       = "dirtytime_expire_seconds",
2789                 .data           = &dirtytime_expire_interval,
2790                 .maxlen         = sizeof(dirtytime_expire_interval),
2791                 .mode           = 0644,
2792                 .proc_handler   = dirtytime_interval_handler,
2793                 .extra1         = SYSCTL_ZERO,
2794         },
2795         {
2796                 .procname       = "swappiness",
2797                 .data           = &vm_swappiness,
2798                 .maxlen         = sizeof(vm_swappiness),
2799                 .mode           = 0644,
2800                 .proc_handler   = proc_dointvec_minmax,
2801                 .extra1         = SYSCTL_ZERO,
2802                 .extra2         = &two_hundred,
2803         },
2804 #ifdef CONFIG_HUGETLB_PAGE
2805         {
2806                 .procname       = "nr_hugepages",
2807                 .data           = NULL,
2808                 .maxlen         = sizeof(unsigned long),
2809                 .mode           = 0644,
2810                 .proc_handler   = hugetlb_sysctl_handler,
2811         },
2812 #ifdef CONFIG_NUMA
2813         {
2814                 .procname       = "nr_hugepages_mempolicy",
2815                 .data           = NULL,
2816                 .maxlen         = sizeof(unsigned long),
2817                 .mode           = 0644,
2818                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
2819         },
2820         {
2821                 .procname               = "numa_stat",
2822                 .data                   = &sysctl_vm_numa_stat,
2823                 .maxlen                 = sizeof(int),
2824                 .mode                   = 0644,
2825                 .proc_handler   = sysctl_vm_numa_stat_handler,
2826                 .extra1                 = SYSCTL_ZERO,
2827                 .extra2                 = SYSCTL_ONE,
2828         },
2829 #endif
2830          {
2831                 .procname       = "hugetlb_shm_group",
2832                 .data           = &sysctl_hugetlb_shm_group,
2833                 .maxlen         = sizeof(gid_t),
2834                 .mode           = 0644,
2835                 .proc_handler   = proc_dointvec,
2836          },
2837         {
2838                 .procname       = "nr_overcommit_hugepages",
2839                 .data           = NULL,
2840                 .maxlen         = sizeof(unsigned long),
2841                 .mode           = 0644,
2842                 .proc_handler   = hugetlb_overcommit_handler,
2843         },
2844 #endif
2845         {
2846                 .procname       = "lowmem_reserve_ratio",
2847                 .data           = &sysctl_lowmem_reserve_ratio,
2848                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
2849                 .mode           = 0644,
2850                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
2851         },
2852         {
2853                 .procname       = "drop_caches",
2854                 .data           = &sysctl_drop_caches,
2855                 .maxlen         = sizeof(int),
2856                 .mode           = 0200,
2857                 .proc_handler   = drop_caches_sysctl_handler,
2858                 .extra1         = SYSCTL_ONE,
2859                 .extra2         = &four,
2860         },
2861 #ifdef CONFIG_COMPACTION
2862         {
2863                 .procname       = "compact_memory",
2864                 .data           = NULL,
2865                 .maxlen         = sizeof(int),
2866                 .mode           = 0200,
2867                 .proc_handler   = sysctl_compaction_handler,
2868         },
2869         {
2870                 .procname       = "compaction_proactiveness",
2871                 .data           = &sysctl_compaction_proactiveness,
2872                 .maxlen         = sizeof(sysctl_compaction_proactiveness),
2873                 .mode           = 0644,
2874                 .proc_handler   = proc_dointvec_minmax,
2875                 .extra1         = SYSCTL_ZERO,
2876                 .extra2         = &one_hundred,
2877         },
2878         {
2879                 .procname       = "extfrag_threshold",
2880                 .data           = &sysctl_extfrag_threshold,
2881                 .maxlen         = sizeof(int),
2882                 .mode           = 0644,
2883                 .proc_handler   = proc_dointvec_minmax,
2884                 .extra1         = &min_extfrag_threshold,
2885                 .extra2         = &max_extfrag_threshold,
2886         },
2887         {
2888                 .procname       = "compact_unevictable_allowed",
2889                 .data           = &sysctl_compact_unevictable_allowed,
2890                 .maxlen         = sizeof(int),
2891                 .mode           = 0644,
2892                 .proc_handler   = proc_dointvec_minmax_warn_RT_change,
2893                 .extra1         = SYSCTL_ZERO,
2894                 .extra2         = SYSCTL_ONE,
2895         },
2896
2897 #endif /* CONFIG_COMPACTION */
2898         {
2899                 .procname       = "min_free_kbytes",
2900                 .data           = &min_free_kbytes,
2901                 .maxlen         = sizeof(min_free_kbytes),
2902                 .mode           = 0644,
2903                 .proc_handler   = min_free_kbytes_sysctl_handler,
2904                 .extra1         = SYSCTL_ZERO,
2905         },
2906         {
2907                 .procname       = "watermark_boost_factor",
2908                 .data           = &watermark_boost_factor,
2909                 .maxlen         = sizeof(watermark_boost_factor),
2910                 .mode           = 0644,
2911                 .proc_handler   = proc_dointvec_minmax,
2912                 .extra1         = SYSCTL_ZERO,
2913         },
2914         {
2915                 .procname       = "watermark_scale_factor",
2916                 .data           = &watermark_scale_factor,
2917                 .maxlen         = sizeof(watermark_scale_factor),
2918                 .mode           = 0644,
2919                 .proc_handler   = watermark_scale_factor_sysctl_handler,
2920                 .extra1         = SYSCTL_ONE,
2921                 .extra2         = &one_thousand,
2922         },
2923         {
2924                 .procname       = "percpu_pagelist_high_fraction",
2925                 .data           = &percpu_pagelist_high_fraction,
2926                 .maxlen         = sizeof(percpu_pagelist_high_fraction),
2927                 .mode           = 0644,
2928                 .proc_handler   = percpu_pagelist_high_fraction_sysctl_handler,
2929                 .extra1         = SYSCTL_ZERO,
2930         },
2931         {
2932                 .procname       = "page_lock_unfairness",
2933                 .data           = &sysctl_page_lock_unfairness,
2934                 .maxlen         = sizeof(sysctl_page_lock_unfairness),
2935                 .mode           = 0644,
2936                 .proc_handler   = proc_dointvec_minmax,
2937                 .extra1         = SYSCTL_ZERO,
2938         },
2939 #ifdef CONFIG_MMU
2940         {
2941                 .procname       = "max_map_count",
2942                 .data           = &sysctl_max_map_count,
2943                 .maxlen         = sizeof(sysctl_max_map_count),
2944                 .mode           = 0644,
2945                 .proc_handler   = proc_dointvec_minmax,
2946                 .extra1         = SYSCTL_ZERO,
2947         },
2948 #else
2949         {
2950                 .procname       = "nr_trim_pages",
2951                 .data           = &sysctl_nr_trim_pages,
2952                 .maxlen         = sizeof(sysctl_nr_trim_pages),
2953                 .mode           = 0644,
2954                 .proc_handler   = proc_dointvec_minmax,
2955                 .extra1         = SYSCTL_ZERO,
2956         },
2957 #endif
2958         {
2959                 .procname       = "laptop_mode",
2960                 .data           = &laptop_mode,
2961                 .maxlen         = sizeof(laptop_mode),
2962                 .mode           = 0644,
2963                 .proc_handler   = proc_dointvec_jiffies,
2964         },
2965         {
2966                 .procname       = "vfs_cache_pressure",
2967                 .data           = &sysctl_vfs_cache_pressure,
2968                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
2969                 .mode           = 0644,
2970                 .proc_handler   = proc_dointvec_minmax,
2971                 .extra1         = SYSCTL_ZERO,
2972         },
2973 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2974     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2975         {
2976                 .procname       = "legacy_va_layout",
2977                 .data           = &sysctl_legacy_va_layout,
2978                 .maxlen         = sizeof(sysctl_legacy_va_layout),
2979                 .mode           = 0644,
2980                 .proc_handler   = proc_dointvec_minmax,
2981                 .extra1         = SYSCTL_ZERO,
2982         },
2983 #endif
2984 #ifdef CONFIG_NUMA
2985         {
2986                 .procname       = "zone_reclaim_mode",
2987                 .data           = &node_reclaim_mode,
2988                 .maxlen         = sizeof(node_reclaim_mode),
2989                 .mode           = 0644,
2990                 .proc_handler   = proc_dointvec_minmax,
2991                 .extra1         = SYSCTL_ZERO,
2992         },
2993         {
2994                 .procname       = "min_unmapped_ratio",
2995                 .data           = &sysctl_min_unmapped_ratio,
2996                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
2997                 .mode           = 0644,
2998                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
2999                 .extra1         = SYSCTL_ZERO,
3000                 .extra2         = &one_hundred,
3001         },
3002         {
3003                 .procname       = "min_slab_ratio",
3004                 .data           = &sysctl_min_slab_ratio,
3005                 .maxlen         = sizeof(sysctl_min_slab_ratio),
3006                 .mode           = 0644,
3007                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
3008                 .extra1         = SYSCTL_ZERO,
3009                 .extra2         = &one_hundred,
3010         },
3011 #endif
3012 #ifdef CONFIG_SMP
3013         {
3014                 .procname       = "stat_interval",
3015                 .data           = &sysctl_stat_interval,
3016                 .maxlen         = sizeof(sysctl_stat_interval),
3017                 .mode           = 0644,
3018                 .proc_handler   = proc_dointvec_jiffies,
3019         },
3020         {
3021                 .procname       = "stat_refresh",
3022                 .data           = NULL,
3023                 .maxlen         = 0,
3024                 .mode           = 0600,
3025                 .proc_handler   = vmstat_refresh,
3026         },
3027 #endif
3028 #ifdef CONFIG_MMU
3029         {
3030                 .procname       = "mmap_min_addr",
3031                 .data           = &dac_mmap_min_addr,
3032                 .maxlen         = sizeof(unsigned long),
3033                 .mode           = 0644,
3034                 .proc_handler   = mmap_min_addr_handler,
3035         },
3036 #endif
3037 #ifdef CONFIG_NUMA
3038         {
3039                 .procname       = "numa_zonelist_order",
3040                 .data           = &numa_zonelist_order,
3041                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
3042                 .mode           = 0644,
3043                 .proc_handler   = numa_zonelist_order_handler,
3044         },
3045 #endif
3046 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
3047    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
3048         {
3049                 .procname       = "vdso_enabled",
3050 #ifdef CONFIG_X86_32
3051                 .data           = &vdso32_enabled,
3052                 .maxlen         = sizeof(vdso32_enabled),
3053 #else
3054                 .data           = &vdso_enabled,
3055                 .maxlen         = sizeof(vdso_enabled),
3056 #endif
3057                 .mode           = 0644,
3058                 .proc_handler   = proc_dointvec,
3059                 .extra1         = SYSCTL_ZERO,
3060         },
3061 #endif
3062 #ifdef CONFIG_HIGHMEM
3063         {
3064                 .procname       = "highmem_is_dirtyable",
3065                 .data           = &vm_highmem_is_dirtyable,
3066                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
3067                 .mode           = 0644,
3068                 .proc_handler   = proc_dointvec_minmax,
3069                 .extra1         = SYSCTL_ZERO,
3070                 .extra2         = SYSCTL_ONE,
3071         },
3072 #endif
3073 #ifdef CONFIG_MEMORY_FAILURE
3074         {
3075                 .procname       = "memory_failure_early_kill",
3076                 .data           = &sysctl_memory_failure_early_kill,
3077                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
3078                 .mode           = 0644,
3079                 .proc_handler   = proc_dointvec_minmax,
3080                 .extra1         = SYSCTL_ZERO,
3081                 .extra2         = SYSCTL_ONE,
3082         },
3083         {
3084                 .procname       = "memory_failure_recovery",
3085                 .data           = &sysctl_memory_failure_recovery,
3086                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
3087                 .mode           = 0644,
3088                 .proc_handler   = proc_dointvec_minmax,
3089                 .extra1         = SYSCTL_ZERO,
3090                 .extra2         = SYSCTL_ONE,
3091         },
3092 #endif
3093         {
3094                 .procname       = "user_reserve_kbytes",
3095                 .data           = &sysctl_user_reserve_kbytes,
3096                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
3097                 .mode           = 0644,
3098                 .proc_handler   = proc_doulongvec_minmax,
3099         },
3100         {
3101                 .procname       = "admin_reserve_kbytes",
3102                 .data           = &sysctl_admin_reserve_kbytes,
3103                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
3104                 .mode           = 0644,
3105                 .proc_handler   = proc_doulongvec_minmax,
3106         },
3107 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3108         {
3109                 .procname       = "mmap_rnd_bits",
3110                 .data           = &mmap_rnd_bits,
3111                 .maxlen         = sizeof(mmap_rnd_bits),
3112                 .mode           = 0600,
3113                 .proc_handler   = proc_dointvec_minmax,
3114                 .extra1         = (void *)&mmap_rnd_bits_min,
3115                 .extra2         = (void *)&mmap_rnd_bits_max,
3116         },
3117 #endif
3118 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3119         {
3120                 .procname       = "mmap_rnd_compat_bits",
3121                 .data           = &mmap_rnd_compat_bits,
3122                 .maxlen         = sizeof(mmap_rnd_compat_bits),
3123                 .mode           = 0600,
3124                 .proc_handler   = proc_dointvec_minmax,
3125                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
3126                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
3127         },
3128 #endif
3129 #ifdef CONFIG_USERFAULTFD
3130         {
3131                 .procname       = "unprivileged_userfaultfd",
3132                 .data           = &sysctl_unprivileged_userfaultfd,
3133                 .maxlen         = sizeof(sysctl_unprivileged_userfaultfd),
3134                 .mode           = 0644,
3135                 .proc_handler   = proc_dointvec_minmax,
3136                 .extra1         = SYSCTL_ZERO,
3137                 .extra2         = SYSCTL_ONE,
3138         },
3139 #endif
3140         { }
3141 };
3142
3143 static struct ctl_table fs_table[] = {
3144         {
3145                 .procname       = "inode-nr",
3146                 .data           = &inodes_stat,
3147                 .maxlen         = 2*sizeof(long),
3148                 .mode           = 0444,
3149                 .proc_handler   = proc_nr_inodes,
3150         },
3151         {
3152                 .procname       = "inode-state",
3153                 .data           = &inodes_stat,
3154                 .maxlen         = 7*sizeof(long),
3155                 .mode           = 0444,
3156                 .proc_handler   = proc_nr_inodes,
3157         },
3158         {
3159                 .procname       = "file-nr",
3160                 .data           = &files_stat,
3161                 .maxlen         = sizeof(files_stat),
3162                 .mode           = 0444,
3163                 .proc_handler   = proc_nr_files,
3164         },
3165         {
3166                 .procname       = "file-max",
3167                 .data           = &files_stat.max_files,
3168                 .maxlen         = sizeof(files_stat.max_files),
3169                 .mode           = 0644,
3170                 .proc_handler   = proc_doulongvec_minmax,
3171                 .extra1         = &zero_ul,
3172                 .extra2         = &long_max,
3173         },
3174         {
3175                 .procname       = "nr_open",
3176                 .data           = &sysctl_nr_open,
3177                 .maxlen         = sizeof(unsigned int),
3178                 .mode           = 0644,
3179                 .proc_handler   = proc_dointvec_minmax,
3180                 .extra1         = &sysctl_nr_open_min,
3181                 .extra2         = &sysctl_nr_open_max,
3182         },
3183         {
3184                 .procname       = "dentry-state",
3185                 .data           = &dentry_stat,
3186                 .maxlen         = 6*sizeof(long),
3187                 .mode           = 0444,
3188                 .proc_handler   = proc_nr_dentry,
3189         },
3190         {
3191                 .procname       = "overflowuid",
3192                 .data           = &fs_overflowuid,
3193                 .maxlen         = sizeof(int),
3194                 .mode           = 0644,
3195                 .proc_handler   = proc_dointvec_minmax,
3196                 .extra1         = &minolduid,
3197                 .extra2         = &maxolduid,
3198         },
3199         {
3200                 .procname       = "overflowgid",
3201                 .data           = &fs_overflowgid,
3202                 .maxlen         = sizeof(int),
3203                 .mode           = 0644,
3204                 .proc_handler   = proc_dointvec_minmax,
3205                 .extra1         = &minolduid,
3206                 .extra2         = &maxolduid,
3207         },
3208 #ifdef CONFIG_FILE_LOCKING
3209         {
3210                 .procname       = "leases-enable",
3211                 .data           = &leases_enable,
3212                 .maxlen         = sizeof(int),
3213                 .mode           = 0644,
3214                 .proc_handler   = proc_dointvec,
3215         },
3216 #endif
3217 #ifdef CONFIG_DNOTIFY
3218         {
3219                 .procname       = "dir-notify-enable",
3220                 .data           = &dir_notify_enable,
3221                 .maxlen         = sizeof(int),
3222                 .mode           = 0644,
3223                 .proc_handler   = proc_dointvec,
3224         },
3225 #endif
3226 #ifdef CONFIG_MMU
3227 #ifdef CONFIG_FILE_LOCKING
3228         {
3229                 .procname       = "lease-break-time",
3230                 .data           = &lease_break_time,
3231                 .maxlen         = sizeof(int),
3232                 .mode           = 0644,
3233                 .proc_handler   = proc_dointvec,
3234         },
3235 #endif
3236 #ifdef CONFIG_AIO
3237         {
3238                 .procname       = "aio-nr",
3239                 .data           = &aio_nr,
3240                 .maxlen         = sizeof(aio_nr),
3241                 .mode           = 0444,
3242                 .proc_handler   = proc_doulongvec_minmax,
3243         },
3244         {
3245                 .procname       = "aio-max-nr",
3246                 .data           = &aio_max_nr,
3247                 .maxlen         = sizeof(aio_max_nr),
3248                 .mode           = 0644,
3249                 .proc_handler   = proc_doulongvec_minmax,
3250         },
3251 #endif /* CONFIG_AIO */
3252 #ifdef CONFIG_INOTIFY_USER
3253         {
3254                 .procname       = "inotify",
3255                 .mode           = 0555,
3256                 .child          = inotify_table,
3257         },
3258 #endif
3259 #ifdef CONFIG_FANOTIFY
3260         {
3261                 .procname       = "fanotify",
3262                 .mode           = 0555,
3263                 .child          = fanotify_table,
3264         },
3265 #endif
3266 #ifdef CONFIG_EPOLL
3267         {
3268                 .procname       = "epoll",
3269                 .mode           = 0555,
3270                 .child          = epoll_table,
3271         },
3272 #endif
3273 #endif
3274         {
3275                 .procname       = "protected_symlinks",
3276                 .data           = &sysctl_protected_symlinks,
3277                 .maxlen         = sizeof(int),
3278                 .mode           = 0600,
3279                 .proc_handler   = proc_dointvec_minmax,
3280                 .extra1         = SYSCTL_ZERO,
3281                 .extra2         = SYSCTL_ONE,
3282         },
3283         {
3284                 .procname       = "protected_hardlinks",
3285                 .data           = &sysctl_protected_hardlinks,
3286                 .maxlen         = sizeof(int),
3287                 .mode           = 0600,
3288                 .proc_handler   = proc_dointvec_minmax,
3289                 .extra1         = SYSCTL_ZERO,
3290                 .extra2         = SYSCTL_ONE,
3291         },
3292         {
3293                 .procname       = "protected_fifos",
3294                 .data           = &sysctl_protected_fifos,
3295                 .maxlen         = sizeof(int),
3296                 .mode           = 0600,
3297                 .proc_handler   = proc_dointvec_minmax,
3298                 .extra1         = SYSCTL_ZERO,
3299                 .extra2         = &two,
3300         },
3301         {
3302                 .procname       = "protected_regular",
3303                 .data           = &sysctl_protected_regular,
3304                 .maxlen         = sizeof(int),
3305                 .mode           = 0600,
3306                 .proc_handler   = proc_dointvec_minmax,
3307                 .extra1         = SYSCTL_ZERO,
3308                 .extra2         = &two,
3309         },
3310         {
3311                 .procname       = "suid_dumpable",
3312                 .data           = &suid_dumpable,
3313                 .maxlen         = sizeof(int),
3314                 .mode           = 0644,
3315                 .proc_handler   = proc_dointvec_minmax_coredump,
3316                 .extra1         = SYSCTL_ZERO,
3317                 .extra2         = &two,
3318         },
3319 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3320         {
3321                 .procname       = "binfmt_misc",
3322                 .mode           = 0555,
3323                 .child          = sysctl_mount_point,
3324         },
3325 #endif
3326         {
3327                 .procname       = "pipe-max-size",
3328                 .data           = &pipe_max_size,
3329                 .maxlen         = sizeof(pipe_max_size),
3330                 .mode           = 0644,
3331                 .proc_handler   = proc_dopipe_max_size,
3332         },
3333         {
3334                 .procname       = "pipe-user-pages-hard",
3335                 .data           = &pipe_user_pages_hard,
3336                 .maxlen         = sizeof(pipe_user_pages_hard),
3337                 .mode           = 0644,
3338                 .proc_handler   = proc_doulongvec_minmax,
3339         },
3340         {
3341                 .procname       = "pipe-user-pages-soft",
3342                 .data           = &pipe_user_pages_soft,
3343                 .maxlen         = sizeof(pipe_user_pages_soft),
3344                 .mode           = 0644,
3345                 .proc_handler   = proc_doulongvec_minmax,
3346         },
3347         {
3348                 .procname       = "mount-max",
3349                 .data           = &sysctl_mount_max,
3350                 .maxlen         = sizeof(unsigned int),
3351                 .mode           = 0644,
3352                 .proc_handler   = proc_dointvec_minmax,
3353                 .extra1         = SYSCTL_ONE,
3354         },
3355         { }
3356 };
3357
3358 static struct ctl_table debug_table[] = {
3359 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3360         {
3361                 .procname       = "exception-trace",
3362                 .data           = &show_unhandled_signals,
3363                 .maxlen         = sizeof(int),
3364                 .mode           = 0644,
3365                 .proc_handler   = proc_dointvec
3366         },
3367 #endif
3368 #if defined(CONFIG_OPTPROBES)
3369         {
3370                 .procname       = "kprobes-optimization",
3371                 .data           = &sysctl_kprobes_optimization,
3372                 .maxlen         = sizeof(int),
3373                 .mode           = 0644,
3374                 .proc_handler   = proc_kprobes_optimization_handler,
3375                 .extra1         = SYSCTL_ZERO,
3376                 .extra2         = SYSCTL_ONE,
3377         },
3378 #endif
3379         { }
3380 };
3381
3382 static struct ctl_table dev_table[] = {
3383         { }
3384 };
3385
3386 static struct ctl_table sysctl_base_table[] = {
3387         {
3388                 .procname       = "kernel",
3389                 .mode           = 0555,
3390                 .child          = kern_table,
3391         },
3392         {
3393                 .procname       = "vm",
3394                 .mode           = 0555,
3395                 .child          = vm_table,
3396         },
3397         {
3398                 .procname       = "fs",
3399                 .mode           = 0555,
3400                 .child          = fs_table,
3401         },
3402         {
3403                 .procname       = "debug",
3404                 .mode           = 0555,
3405                 .child          = debug_table,
3406         },
3407         {
3408                 .procname       = "dev",
3409                 .mode           = 0555,
3410                 .child          = dev_table,
3411         },
3412         { }
3413 };
3414
3415 int __init sysctl_init(void)
3416 {
3417         struct ctl_table_header *hdr;
3418
3419         hdr = register_sysctl_table(sysctl_base_table);
3420         kmemleak_not_leak(hdr);
3421         return 0;
3422 }
3423 #endif /* CONFIG_SYSCTL */
3424 /*
3425  * No sense putting this after each symbol definition, twice,
3426  * exception granted :-)
3427  */
3428 EXPORT_SYMBOL(proc_dointvec);
3429 EXPORT_SYMBOL(proc_douintvec);
3430 EXPORT_SYMBOL(proc_dointvec_jiffies);
3431 EXPORT_SYMBOL(proc_dointvec_minmax);
3432 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3433 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3434 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3435 EXPORT_SYMBOL(proc_dostring);
3436 EXPORT_SYMBOL(proc_doulongvec_minmax);
3437 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3438 EXPORT_SYMBOL(proc_do_large_bitmap);