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/filter.h>
  37 #include <linux/fs.h>
  38 #include <linux/init.h>
  39 #include <linux/kernel.h>
  40 #include <linux/kobject.h>
  41 #include <linux/net.h>
  42 #include <linux/sysrq.h>
  43 #include <linux/highuid.h>
  44 #include <linux/writeback.h>
  45 #include <linux/ratelimit.h>
  46 #include <linux/compaction.h>
  47 #include <linux/hugetlb.h>
  48 #include <linux/initrd.h>
  49 #include <linux/key.h>
  50 #include <linux/times.h>
  51 #include <linux/limits.h>
  52 #include <linux/dcache.h>
  53 #include <linux/dnotify.h>
  54 #include <linux/syscalls.h>
  55 #include <linux/vmstat.h>
  56 #include <linux/nfs_fs.h>
  57 #include <linux/acpi.h>
  58 #include <linux/reboot.h>
  59 #include <linux/ftrace.h>
  60 #include <linux/perf_event.h>
  61 #include <linux/kprobes.h>
  62 #include <linux/pipe_fs_i.h>
  63 #include <linux/oom.h>
  64 #include <linux/kmod.h>
  65 #include <linux/capability.h>
  66 #include <linux/binfmts.h>
  67 #include <linux/sched/sysctl.h>
  68 #include <linux/sched/coredump.h>
  69 #include <linux/kexec.h>
  70 #include <linux/bpf.h>
  71 #include <linux/mount.h>
  72 #include <linux/userfaultfd_k.h>
  73 #include <linux/coredump.h>
  74 #include <linux/latencytop.h>
  75 #include <linux/pid.h>
  76 #include <linux/delayacct.h>
  77
  78 #include "../lib/kstrtox.h"
  79
  80 #include <linux/uaccess.h>
  81 #include <asm/processor.h>
  82
  83 #ifdef CONFIG_X86
  84 #include <asm/nmi.h>
  85 #include <asm/stacktrace.h>
  86 #include <asm/io.h>
  87 #endif
  88 #ifdef CONFIG_SPARC
  89 #include <asm/setup.h>
  90 #endif
  91 #ifdef CONFIG_BSD_PROCESS_ACCT
  92 #include <linux/acct.h>
  93 #endif
  94 #ifdef CONFIG_RT_MUTEXES
  95 #include <linux/rtmutex.h>
  96 #endif
  97 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  98 #include <linux/lockdep.h>
  99 #endif
 100 #ifdef CONFIG_CHR_DEV_SG
 101 #include <scsi/sg.h>
 102 #endif
 103 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
 104 #include <linux/stackleak.h>
 105 #endif
 106 #ifdef CONFIG_LOCKUP_DETECTOR
 107 #include <linux/nmi.h>
 108 #endif
 109
 110 #if defined(CONFIG_SYSCTL)
 111
 112 /* Constants used for minimum and  maximum */
 113 #ifdef CONFIG_LOCKUP_DETECTOR
 114 static int sixty = 60;
 115 #endif
 116
 117 static int __maybe_unused neg_one = -1;
 118 static int __maybe_unused two = 2;
 119 static int __maybe_unused four = 4;
 120 static unsigned long zero_ul;
 121 static unsigned long one_ul = 1;
 122 static unsigned long long_max = LONG_MAX;
 123 static int one_hundred = 100;
 124 static int two_hundred = 200;
 125 static int one_thousand = 1000;
 126 #ifdef CONFIG_PRINTK
 127 static int ten_thousand = 10000;
 128 #endif
 129 #ifdef CONFIG_PERF_EVENTS
 130 static int six_hundred_forty_kb = 640 * 1024;
 131 #endif
 132
 133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 135
 136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 137 static int maxolduid = 65535;
 138 static int minolduid;
 139
 140 static int ngroups_max = NGROUPS_MAX;
 141 static const int cap_last_cap = CAP_LAST_CAP;
 142
 143 /*
 144  * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
 145  * and hung_task_check_interval_secs
 146  */
 147 #ifdef CONFIG_DETECT_HUNG_TASK
 148 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 149 #endif
 150
 151 #ifdef CONFIG_INOTIFY_USER
 152 #include <linux/inotify.h>
 153 #endif
 154 #ifdef CONFIG_FANOTIFY
 155 #include <linux/fanotify.h>
 156 #endif
 157
 158 #ifdef CONFIG_PROC_SYSCTL
 159
 160 /**
 161  * enum sysctl_writes_mode - supported sysctl write modes
 162  *
 163  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 164  *      to be written, and multiple writes on the same sysctl file descriptor
 165  *      will rewrite the sysctl value, regardless of file position. No warning
 166  *      is issued when the initial position is not 0.
 167  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 168  *      not 0.
 169  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 170  *      file position 0 and the value must be fully contained in the buffer
 171  *      sent to the write syscall. If dealing with strings respect the file
 172  *      position, but restrict this to the max length of the buffer, anything
 173  *      passed the max length will be ignored. Multiple writes will append
 174  *      to the buffer.
 175  *
 176  * These write modes control how current file position affects the behavior of
 177  * updating sysctl values through the proc interface on each write.
 178  */
 179 enum sysctl_writes_mode {
 180         SYSCTL_WRITES_LEGACY            = -1,
 181         SYSCTL_WRITES_WARN              = 0,
 182         SYSCTL_WRITES_STRICT            = 1,
 183 };
 184
 185 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 186 #endif /* CONFIG_PROC_SYSCTL */
 187
 188 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
 189     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
 190 int sysctl_legacy_va_layout;
 191 #endif
 192
 193 #ifdef CONFIG_COMPACTION
 194 static int min_extfrag_threshold;
 195 static int max_extfrag_threshold = 1000;
 196 #endif
 197
 198 #endif /* CONFIG_SYSCTL */
 199
 200 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
 201 static int bpf_stats_handler(struct ctl_table *table, int write,
 202                              void *buffer, size_t *lenp, loff_t *ppos)
 203 {
 204         struct static_key *key = (struct static_key *)table->data;
 205         static int saved_val;
 206         int val, ret;
 207         struct ctl_table tmp = {
 208                 .data   = &val,
 209                 .maxlen = sizeof(val),
 210                 .mode   = table->mode,
 211                 .extra1 = SYSCTL_ZERO,
 212                 .extra2 = SYSCTL_ONE,
 213         };
 214
 215         if (write && !capable(CAP_SYS_ADMIN))
 216                 return -EPERM;
 217
 218         mutex_lock(&bpf_stats_enabled_mutex);
 219         val = saved_val;
 220         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 221         if (write && !ret && val != saved_val) {
 222                 if (val)
 223                         static_key_slow_inc(key);
 224                 else
 225                         static_key_slow_dec(key);
 226                 saved_val = val;
 227         }
 228         mutex_unlock(&bpf_stats_enabled_mutex);
 229         return ret;
 230 }
 231
 232 static int bpf_unpriv_handler(struct ctl_table *table, int write,
 233                               void *buffer, size_t *lenp, loff_t *ppos)
 234 {
 235         int ret, unpriv_enable = *(int *)table->data;
 236         bool locked_state = unpriv_enable == 1;
 237         struct ctl_table tmp = *table;
 238
 239         if (write && !capable(CAP_SYS_ADMIN))
 240                 return -EPERM;
 241
 242         tmp.data = &unpriv_enable;
 243         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 244         if (write && !ret) {
 245                 if (locked_state && unpriv_enable != 1)
 246                         return -EPERM;
 247                 *(int *)table->data = unpriv_enable;
 248         }
 249         return ret;
 250 }
 251 #endif /* CONFIG_BPF_SYSCALL && CONFIG_SYSCTL */
 252
 253 /*
 254  * /proc/sys support
 255  */
 256
 257 #ifdef CONFIG_PROC_SYSCTL
 258
 259 static int _proc_do_string(char *data, int maxlen, int write,
 260                 char *buffer, size_t *lenp, loff_t *ppos)
 261 {
 262         size_t len;
 263         char c, *p;
 264
 265         if (!data || !maxlen || !*lenp) {
 266                 *lenp = 0;
 267                 return 0;
 268         }
 269
 270         if (write) {
 271                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
 272                         /* Only continue writes not past the end of buffer. */
 273                         len = strlen(data);
 274                         if (len > maxlen - 1)
 275                                 len = maxlen - 1;
 276
 277                         if (*ppos > len)
 278                                 return 0;
 279                         len = *ppos;
 280                 } else {
 281                         /* Start writing from beginning of buffer. */
 282                         len = 0;
 283                 }
 284
 285                 *ppos += *lenp;
 286                 p = buffer;
 287                 while ((p - buffer) < *lenp && len < maxlen - 1) {
 288                         c = *(p++);
 289                         if (c == 0 || c == '\n')
 290                                 break;
 291                         data[len++] = c;
 292                 }
 293                 data[len] = 0;
 294         } else {
 295                 len = strlen(data);
 296                 if (len > maxlen)
 297                         len = maxlen;
 298
 299                 if (*ppos > len) {
 300                         *lenp = 0;
 301                         return 0;
 302                 }
 303
 304                 data += *ppos;
 305                 len  -= *ppos;
 306
 307                 if (len > *lenp)
 308                         len = *lenp;
 309                 if (len)
 310                         memcpy(buffer, data, len);
 311                 if (len < *lenp) {
 312                         buffer[len] = '\n';
 313                         len++;
 314                 }
 315                 *lenp = len;
 316                 *ppos += len;
 317         }
 318         return 0;
 319 }
 320
 321 static void warn_sysctl_write(struct ctl_table *table)
 322 {
 323         pr_warn_once("%s wrote to %s when file position was not 0!\n"
 324                 "This will not be supported in the future. To silence this\n"
 325                 "warning, set kernel.sysctl_writes_strict = -1\n",
 326                 current->comm, table->procname);
 327 }
 328
 329 /**
 330  * proc_first_pos_non_zero_ignore - check if first position is allowed
 331  * @ppos: file position
 332  * @table: the sysctl table
 333  *
 334  * Returns true if the first position is non-zero and the sysctl_writes_strict
 335  * mode indicates this is not allowed for numeric input types. String proc
 336  * handlers can ignore the return value.
 337  */
 338 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
 339                                            struct ctl_table *table)
 340 {
 341         if (!*ppos)
 342                 return false;
 343
 344         switch (sysctl_writes_strict) {
 345         case SYSCTL_WRITES_STRICT:
 346                 return true;
 347         case SYSCTL_WRITES_WARN:
 348                 warn_sysctl_write(table);
 349                 return false;
 350         default:
 351                 return false;
 352         }
 353 }
 354
 355 /**
 356  * proc_dostring - read a string sysctl
 357  * @table: the sysctl table
 358  * @write: %TRUE if this is a write to the sysctl file
 359  * @buffer: the user buffer
 360  * @lenp: the size of the user buffer
 361  * @ppos: file position
 362  *
 363  * Reads/writes a string from/to the user buffer. If the kernel
 364  * buffer provided is not large enough to hold the string, the
 365  * string is truncated. The copied string is %NULL-terminated.
 366  * If the string is being read by the user process, it is copied
 367  * and a newline '\n' is added. It is truncated if the buffer is
 368  * not large enough.
 369  *
 370  * Returns 0 on success.
 371  */
 372 int proc_dostring(struct ctl_table *table, int write,
 373                   void *buffer, size_t *lenp, loff_t *ppos)
 374 {
 375         if (write)
 376                 proc_first_pos_non_zero_ignore(ppos, table);
 377
 378         return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
 379                         ppos);
 380 }
 381
 382 static size_t proc_skip_spaces(char **buf)
 383 {
 384         size_t ret;
 385         char *tmp = skip_spaces(*buf);
 386         ret = tmp - *buf;
 387         *buf = tmp;
 388         return ret;
 389 }
 390
 391 static void proc_skip_char(char **buf, size_t *size, const char v)
 392 {
 393         while (*size) {
 394                 if (**buf != v)
 395                         break;
 396                 (*size)--;
 397                 (*buf)++;
 398         }
 399 }
 400
 401 /**
 402  * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
 403  *                   fail on overflow
 404  *
 405  * @cp: kernel buffer containing the string to parse
 406  * @endp: pointer to store the trailing characters
 407  * @base: the base to use
 408  * @res: where the parsed integer will be stored
 409  *
 410  * In case of success 0 is returned and @res will contain the parsed integer,
 411  * @endp will hold any trailing characters.
 412  * This function will fail the parse on overflow. If there wasn't an overflow
 413  * the function will defer the decision what characters count as invalid to the
 414  * caller.
 415  */
 416 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
 417                            unsigned long *res)
 418 {
 419         unsigned long long result;
 420         unsigned int rv;
 421
 422         cp = _parse_integer_fixup_radix(cp, &base);
 423         rv = _parse_integer(cp, base, &result);
 424         if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
 425                 return -ERANGE;
 426
 427         cp += rv;
 428
 429         if (endp)
 430                 *endp = (char *)cp;
 431
 432         *res = (unsigned long)result;
 433         return 0;
 434 }
 435
 436 #define TMPBUFLEN 22
 437 /**
 438  * proc_get_long - reads an ASCII formatted integer from a user buffer
 439  *
 440  * @buf: a kernel buffer
 441  * @size: size of the kernel buffer
 442  * @val: this is where the number will be stored
 443  * @neg: set to %TRUE if number is negative
 444  * @perm_tr: a vector which contains the allowed trailers
 445  * @perm_tr_len: size of the perm_tr vector
 446  * @tr: pointer to store the trailer character
 447  *
 448  * In case of success %0 is returned and @buf and @size are updated with
 449  * the amount of bytes read. If @tr is non-NULL and a trailing
 450  * character exists (size is non-zero after returning from this
 451  * function), @tr is updated with the trailing character.
 452  */
 453 static int proc_get_long(char **buf, size_t *size,
 454                           unsigned long *val, bool *neg,
 455                           const char *perm_tr, unsigned perm_tr_len, char *tr)
 456 {
 457         int len;
 458         char *p, tmp[TMPBUFLEN];
 459
 460         if (!*size)
 461                 return -EINVAL;
 462
 463         len = *size;
 464         if (len > TMPBUFLEN - 1)
 465                 len = TMPBUFLEN - 1;
 466
 467         memcpy(tmp, *buf, len);
 468
 469         tmp[len] = 0;
 470         p = tmp;
 471         if (*p == '-' && *size > 1) {
 472                 *neg = true;
 473                 p++;
 474         } else
 475                 *neg = false;
 476         if (!isdigit(*p))
 477                 return -EINVAL;
 478
 479         if (strtoul_lenient(p, &p, 0, val))
 480                 return -EINVAL;
 481
 482         len = p - tmp;
 483
 484         /* We don't know if the next char is whitespace thus we may accept
 485          * invalid integers (e.g. 1234...a) or two integers instead of one
 486          * (e.g. 123...1). So lets not allow such large numbers. */
 487         if (len == TMPBUFLEN - 1)
 488                 return -EINVAL;
 489
 490         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
 491                 return -EINVAL;
 492
 493         if (tr && (len < *size))
 494                 *tr = *p;
 495
 496         *buf += len;
 497         *size -= len;
 498
 499         return 0;
 500 }
 501
 502 /**
 503  * proc_put_long - converts an integer to a decimal ASCII formatted string
 504  *
 505  * @buf: the user buffer
 506  * @size: the size of the user buffer
 507  * @val: the integer to be converted
 508  * @neg: sign of the number, %TRUE for negative
 509  *
 510  * In case of success @buf and @size are updated with the amount of bytes
 511  * written.
 512  */
 513 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
 514 {
 515         int len;
 516         char tmp[TMPBUFLEN], *p = tmp;
 517
 518         sprintf(p, "%s%lu", neg ? "-" : "", val);
 519         len = strlen(tmp);
 520         if (len > *size)
 521                 len = *size;
 522         memcpy(*buf, tmp, len);
 523         *size -= len;
 524         *buf += len;
 525 }
 526 #undef TMPBUFLEN
 527
 528 static void proc_put_char(void **buf, size_t *size, char c)
 529 {
 530         if (*size) {
 531                 char **buffer = (char **)buf;
 532                 **buffer = c;
 533
 534                 (*size)--;
 535                 (*buffer)++;
 536                 *buf = *buffer;
 537         }
 538 }
 539
 540 static int do_proc_dobool_conv(bool *negp, unsigned long *lvalp,
 541                                 int *valp,
 542                                 int write, void *data)
 543 {
 544         if (write) {
 545                 *(bool *)valp = *lvalp;
 546         } else {
 547                 int val = *(bool *)valp;
 548
 549                 *lvalp = (unsigned long)val;
 550                 *negp = false;
 551         }
 552         return 0;
 553 }
 554
 555 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
 556                                  int *valp,
 557                                  int write, void *data)
 558 {
 559         if (write) {
 560                 if (*negp) {
 561                         if (*lvalp > (unsigned long) INT_MAX + 1)
 562                                 return -EINVAL;
 563                         *valp = -*lvalp;
 564                 } else {
 565                         if (*lvalp > (unsigned long) INT_MAX)
 566                                 return -EINVAL;
 567                         *valp = *lvalp;
 568                 }
 569         } else {
 570                 int val = *valp;
 571                 if (val < 0) {
 572                         *negp = true;
 573                         *lvalp = -(unsigned long)val;
 574                 } else {
 575                         *negp = false;
 576                         *lvalp = (unsigned long)val;
 577                 }
 578         }
 579         return 0;
 580 }
 581
 582 static int do_proc_douintvec_conv(unsigned long *lvalp,
 583                                   unsigned int *valp,
 584                                   int write, void *data)
 585 {
 586         if (write) {
 587                 if (*lvalp > UINT_MAX)
 588                         return -EINVAL;
 589                 *valp = *lvalp;
 590         } else {
 591                 unsigned int val = *valp;
 592                 *lvalp = (unsigned long)val;
 593         }
 594         return 0;
 595 }
 596
 597 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
 598
 599 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
 600                   int write, void *buffer,
 601                   size_t *lenp, loff_t *ppos,
 602                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 603                               int write, void *data),
 604                   void *data)
 605 {
 606         int *i, vleft, first = 1, err = 0;
 607         size_t left;
 608         char *p;
 609
 610         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 611                 *lenp = 0;
 612                 return 0;
 613         }
 614
 615         i = (int *) tbl_data;
 616         vleft = table->maxlen / sizeof(*i);
 617         left = *lenp;
 618
 619         if (!conv)
 620                 conv = do_proc_dointvec_conv;
 621
 622         if (write) {
 623                 if (proc_first_pos_non_zero_ignore(ppos, table))
 624                         goto out;
 625
 626                 if (left > PAGE_SIZE - 1)
 627                         left = PAGE_SIZE - 1;
 628                 p = buffer;
 629         }
 630
 631         for (; left && vleft--; i++, first=0) {
 632                 unsigned long lval;
 633                 bool neg;
 634
 635                 if (write) {
 636                         left -= proc_skip_spaces(&p);
 637
 638                         if (!left)
 639                                 break;
 640                         err = proc_get_long(&p, &left, &lval, &neg,
 641                                              proc_wspace_sep,
 642                                              sizeof(proc_wspace_sep), NULL);
 643                         if (err)
 644                                 break;
 645                         if (conv(&neg, &lval, i, 1, data)) {
 646                                 err = -EINVAL;
 647                                 break;
 648                         }
 649                 } else {
 650                         if (conv(&neg, &lval, i, 0, data)) {
 651                                 err = -EINVAL;
 652                                 break;
 653                         }
 654                         if (!first)
 655                                 proc_put_char(&buffer, &left, '\t');
 656                         proc_put_long(&buffer, &left, lval, neg);
 657                 }
 658         }
 659
 660         if (!write && !first && left && !err)
 661                 proc_put_char(&buffer, &left, '\n');
 662         if (write && !err && left)
 663                 left -= proc_skip_spaces(&p);
 664         if (write && first)
 665                 return err ? : -EINVAL;
 666         *lenp -= left;
 667 out:
 668         *ppos += *lenp;
 669         return err;
 670 }
 671
 672 static int do_proc_dointvec(struct ctl_table *table, int write,
 673                   void *buffer, size_t *lenp, loff_t *ppos,
 674                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
 675                               int write, void *data),
 676                   void *data)
 677 {
 678         return __do_proc_dointvec(table->data, table, write,
 679                         buffer, lenp, ppos, conv, data);
 680 }
 681
 682 static int do_proc_douintvec_w(unsigned int *tbl_data,
 683                                struct ctl_table *table,
 684                                void *buffer,
 685                                size_t *lenp, loff_t *ppos,
 686                                int (*conv)(unsigned long *lvalp,
 687                                            unsigned int *valp,
 688                                            int write, void *data),
 689                                void *data)
 690 {
 691         unsigned long lval;
 692         int err = 0;
 693         size_t left;
 694         bool neg;
 695         char *p = buffer;
 696
 697         left = *lenp;
 698
 699         if (proc_first_pos_non_zero_ignore(ppos, table))
 700                 goto bail_early;
 701
 702         if (left > PAGE_SIZE - 1)
 703                 left = PAGE_SIZE - 1;
 704
 705         left -= proc_skip_spaces(&p);
 706         if (!left) {
 707                 err = -EINVAL;
 708                 goto out_free;
 709         }
 710
 711         err = proc_get_long(&p, &left, &lval, &neg,
 712                              proc_wspace_sep,
 713                              sizeof(proc_wspace_sep), NULL);
 714         if (err || neg) {
 715                 err = -EINVAL;
 716                 goto out_free;
 717         }
 718
 719         if (conv(&lval, tbl_data, 1, data)) {
 720                 err = -EINVAL;
 721                 goto out_free;
 722         }
 723
 724         if (!err && left)
 725                 left -= proc_skip_spaces(&p);
 726
 727 out_free:
 728         if (err)
 729                 return -EINVAL;
 730
 731         return 0;
 732
 733         /* This is in keeping with old __do_proc_dointvec() */
 734 bail_early:
 735         *ppos += *lenp;
 736         return err;
 737 }
 738
 739 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
 740                                size_t *lenp, loff_t *ppos,
 741                                int (*conv)(unsigned long *lvalp,
 742                                            unsigned int *valp,
 743                                            int write, void *data),
 744                                void *data)
 745 {
 746         unsigned long lval;
 747         int err = 0;
 748         size_t left;
 749
 750         left = *lenp;
 751
 752         if (conv(&lval, tbl_data, 0, data)) {
 753                 err = -EINVAL;
 754                 goto out;
 755         }
 756
 757         proc_put_long(&buffer, &left, lval, false);
 758         if (!left)
 759                 goto out;
 760
 761         proc_put_char(&buffer, &left, '\n');
 762
 763 out:
 764         *lenp -= left;
 765         *ppos += *lenp;
 766
 767         return err;
 768 }
 769
 770 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
 771                                int write, void *buffer,
 772                                size_t *lenp, loff_t *ppos,
 773                                int (*conv)(unsigned long *lvalp,
 774                                            unsigned int *valp,
 775                                            int write, void *data),
 776                                void *data)
 777 {
 778         unsigned int *i, vleft;
 779
 780         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
 781                 *lenp = 0;
 782                 return 0;
 783         }
 784
 785         i = (unsigned int *) tbl_data;
 786         vleft = table->maxlen / sizeof(*i);
 787
 788         /*
 789          * Arrays are not supported, keep this simple. *Do not* add
 790          * support for them.
 791          */
 792         if (vleft != 1) {
 793                 *lenp = 0;
 794                 return -EINVAL;
 795         }
 796
 797         if (!conv)
 798                 conv = do_proc_douintvec_conv;
 799
 800         if (write)
 801                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
 802                                            conv, data);
 803         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
 804 }
 805
 806 static int do_proc_douintvec(struct ctl_table *table, int write,
 807                              void *buffer, size_t *lenp, loff_t *ppos,
 808                              int (*conv)(unsigned long *lvalp,
 809                                          unsigned int *valp,
 810                                          int write, void *data),
 811                              void *data)
 812 {
 813         return __do_proc_douintvec(table->data, table, write,
 814                                    buffer, lenp, ppos, conv, data);
 815 }
 816
 817 /**
 818  * proc_dobool - read/write a bool
 819  * @table: the sysctl table
 820  * @write: %TRUE if this is a write to the sysctl file
 821  * @buffer: the user buffer
 822  * @lenp: the size of the user buffer
 823  * @ppos: file position
 824  *
 825  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 826  * values from/to the user buffer, treated as an ASCII string.
 827  *
 828  * Returns 0 on success.
 829  */
 830 int proc_dobool(struct ctl_table *table, int write, void *buffer,
 831                 size_t *lenp, loff_t *ppos)
 832 {
 833         return do_proc_dointvec(table, write, buffer, lenp, ppos,
 834                                 do_proc_dobool_conv, NULL);
 835 }
 836
 837 /**
 838  * proc_dointvec - read a vector of integers
 839  * @table: the sysctl table
 840  * @write: %TRUE if this is a write to the sysctl file
 841  * @buffer: the user buffer
 842  * @lenp: the size of the user buffer
 843  * @ppos: file position
 844  *
 845  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
 846  * values from/to the user buffer, treated as an ASCII string.
 847  *
 848  * Returns 0 on success.
 849  */
 850 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
 851                   size_t *lenp, loff_t *ppos)
 852 {
 853         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
 854 }
 855
 856 #ifdef CONFIG_COMPACTION
 857 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
 858                 int write, void *buffer, size_t *lenp, loff_t *ppos)
 859 {
 860         int ret, old;
 861
 862         if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
 863                 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 864
 865         old = *(int *)table->data;
 866         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 867         if (ret)
 868                 return ret;
 869         if (old != *(int *)table->data)
 870                 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
 871                              table->procname, current->comm,
 872                              task_pid_nr(current));
 873         return ret;
 874 }
 875 #endif
 876
 877 /**
 878  * proc_douintvec - read a vector of unsigned integers
 879  * @table: the sysctl table
 880  * @write: %TRUE if this is a write to the sysctl file
 881  * @buffer: the user buffer
 882  * @lenp: the size of the user buffer
 883  * @ppos: file position
 884  *
 885  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
 886  * values from/to the user buffer, treated as an ASCII string.
 887  *
 888  * Returns 0 on success.
 889  */
 890 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
 891                 size_t *lenp, loff_t *ppos)
 892 {
 893         return do_proc_douintvec(table, write, buffer, lenp, ppos,
 894                                  do_proc_douintvec_conv, NULL);
 895 }
 896
 897 /*
 898  * Taint values can only be increased
 899  * This means we can safely use a temporary.
 900  */
 901 static int proc_taint(struct ctl_table *table, int write,
 902                                void *buffer, size_t *lenp, loff_t *ppos)
 903 {
 904         struct ctl_table t;
 905         unsigned long tmptaint = get_taint();
 906         int err;
 907
 908         if (write && !capable(CAP_SYS_ADMIN))
 909                 return -EPERM;
 910
 911         t = *table;
 912         t.data = &tmptaint;
 913         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
 914         if (err < 0)
 915                 return err;
 916
 917         if (write) {
 918                 int i;
 919
 920                 /*
 921                  * If we are relying on panic_on_taint not producing
 922                  * false positives due to userspace input, bail out
 923                  * before setting the requested taint flags.
 924                  */
 925                 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
 926                         return -EINVAL;
 927
 928                 /*
 929                  * Poor man's atomic or. Not worth adding a primitive
 930                  * to everyone's atomic.h for this
 931                  */
 932                 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
 933                         if ((1UL << i) & tmptaint)
 934                                 add_taint(i, LOCKDEP_STILL_OK);
 935         }
 936
 937         return err;
 938 }
 939
 940 #ifdef CONFIG_PRINTK
 941 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 942                                 void *buffer, size_t *lenp, loff_t *ppos)
 943 {
 944         if (write && !capable(CAP_SYS_ADMIN))
 945                 return -EPERM;
 946
 947         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 948 }
 949 #endif
 950
 951 /**
 952  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
 953  * @min: pointer to minimum allowable value
 954  * @max: pointer to maximum allowable value
 955  *
 956  * The do_proc_dointvec_minmax_conv_param structure provides the
 957  * minimum and maximum values for doing range checking for those sysctl
 958  * parameters that use the proc_dointvec_minmax() handler.
 959  */
 960 struct do_proc_dointvec_minmax_conv_param {
 961         int *min;
 962         int *max;
 963 };
 964
 965 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
 966                                         int *valp,
 967                                         int write, void *data)
 968 {
 969         int tmp, ret;
 970         struct do_proc_dointvec_minmax_conv_param *param = data;
 971         /*
 972          * If writing, first do so via a temporary local int so we can
 973          * bounds-check it before touching *valp.
 974          */
 975         int *ip = write ? &tmp : valp;
 976
 977         ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
 978         if (ret)
 979                 return ret;
 980
 981         if (write) {
 982                 if ((param->min && *param->min > tmp) ||
 983                     (param->max && *param->max < tmp))
 984                         return -EINVAL;
 985                 *valp = tmp;
 986         }
 987
 988         return 0;
 989 }
 990
 991 /**
 992  * proc_dointvec_minmax - read a vector of integers with min/max values
 993  * @table: the sysctl table
 994  * @write: %TRUE if this is a write to the sysctl file
 995  * @buffer: the user buffer
 996  * @lenp: the size of the user buffer
 997  * @ppos: file position
 998  *
 999  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1000  * values from/to the user buffer, treated as an ASCII string.
1001  *
1002  * This routine will ensure the values are within the range specified by
1003  * table->extra1 (min) and table->extra2 (max).
1004  *
1005  * Returns 0 on success or -EINVAL on write when the range check fails.
1006  */
1007 int proc_dointvec_minmax(struct ctl_table *table, int write,
1008                   void *buffer, size_t *lenp, loff_t *ppos)
1009 {
1010         struct do_proc_dointvec_minmax_conv_param param = {
1011                 .min = (int *) table->extra1,
1012                 .max = (int *) table->extra2,
1013         };
1014         return do_proc_dointvec(table, write, buffer, lenp, ppos,
1015                                 do_proc_dointvec_minmax_conv, &param);
1016 }
1017
1018 /**
1019  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
1020  * @min: pointer to minimum allowable value
1021  * @max: pointer to maximum allowable value
1022  *
1023  * The do_proc_douintvec_minmax_conv_param structure provides the
1024  * minimum and maximum values for doing range checking for those sysctl
1025  * parameters that use the proc_douintvec_minmax() handler.
1026  */
1027 struct do_proc_douintvec_minmax_conv_param {
1028         unsigned int *min;
1029         unsigned int *max;
1030 };
1031
1032 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
1033                                          unsigned int *valp,
1034                                          int write, void *data)
1035 {
1036         int ret;
1037         unsigned int tmp;
1038         struct do_proc_douintvec_minmax_conv_param *param = data;
1039         /* write via temporary local uint for bounds-checking */
1040         unsigned int *up = write ? &tmp : valp;
1041
1042         ret = do_proc_douintvec_conv(lvalp, up, write, data);
1043         if (ret)
1044                 return ret;
1045
1046         if (write) {
1047                 if ((param->min && *param->min > tmp) ||
1048                     (param->max && *param->max < tmp))
1049                         return -ERANGE;
1050
1051                 *valp = tmp;
1052         }
1053
1054         return 0;
1055 }
1056
1057 /**
1058  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1059  * @table: the sysctl table
1060  * @write: %TRUE if this is a write to the sysctl file
1061  * @buffer: the user buffer
1062  * @lenp: the size of the user buffer
1063  * @ppos: file position
1064  *
1065  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1066  * values from/to the user buffer, treated as an ASCII string. Negative
1067  * strings are not allowed.
1068  *
1069  * This routine will ensure the values are within the range specified by
1070  * table->extra1 (min) and table->extra2 (max). There is a final sanity
1071  * check for UINT_MAX to avoid having to support wrap around uses from
1072  * userspace.
1073  *
1074  * Returns 0 on success or -ERANGE on write when the range check fails.
1075  */
1076 int proc_douintvec_minmax(struct ctl_table *table, int write,
1077                           void *buffer, size_t *lenp, loff_t *ppos)
1078 {
1079         struct do_proc_douintvec_minmax_conv_param param = {
1080                 .min = (unsigned int *) table->extra1,
1081                 .max = (unsigned int *) table->extra2,
1082         };
1083         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1084                                  do_proc_douintvec_minmax_conv, &param);
1085 }
1086
1087 /**
1088  * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
1089  * @table: the sysctl table
1090  * @write: %TRUE if this is a write to the sysctl file
1091  * @buffer: the user buffer
1092  * @lenp: the size of the user buffer
1093  * @ppos: file position
1094  *
1095  * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
1096  * values from/to the user buffer, treated as an ASCII string. Negative
1097  * strings are not allowed.
1098  *
1099  * This routine will ensure the values are within the range specified by
1100  * table->extra1 (min) and table->extra2 (max).
1101  *
1102  * Returns 0 on success or an error on write when the range check fails.
1103  */
1104 int proc_dou8vec_minmax(struct ctl_table *table, int write,
1105                         void *buffer, size_t *lenp, loff_t *ppos)
1106 {
1107         struct ctl_table tmp;
1108         unsigned int min = 0, max = 255U, val;
1109         u8 *data = table->data;
1110         struct do_proc_douintvec_minmax_conv_param param = {
1111                 .min = &min,
1112                 .max = &max,
1113         };
1114         int res;
1115
1116         /* Do not support arrays yet. */
1117         if (table->maxlen != sizeof(u8))
1118                 return -EINVAL;
1119
1120         if (table->extra1) {
1121                 min = *(unsigned int *) table->extra1;
1122                 if (min > 255U)
1123                         return -EINVAL;
1124         }
1125         if (table->extra2) {
1126                 max = *(unsigned int *) table->extra2;
1127                 if (max > 255U)
1128                         return -EINVAL;
1129         }
1130
1131         tmp = *table;
1132
1133         tmp.maxlen = sizeof(val);
1134         tmp.data = &val;
1135         val = *data;
1136         res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
1137                                 do_proc_douintvec_minmax_conv, &param);
1138         if (res)
1139                 return res;
1140         if (write)
1141                 *data = val;
1142         return 0;
1143 }
1144 EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
1145
1146 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1147                                         unsigned int *valp,
1148                                         int write, void *data)
1149 {
1150         if (write) {
1151                 unsigned int val;
1152
1153                 val = round_pipe_size(*lvalp);
1154                 if (val == 0)
1155                         return -EINVAL;
1156
1157                 *valp = val;
1158         } else {
1159                 unsigned int val = *valp;
1160                 *lvalp = (unsigned long) val;
1161         }
1162
1163         return 0;
1164 }
1165
1166 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1167                                 void *buffer, size_t *lenp, loff_t *ppos)
1168 {
1169         return do_proc_douintvec(table, write, buffer, lenp, ppos,
1170                                  do_proc_dopipe_max_size_conv, NULL);
1171 }
1172
1173 static void validate_coredump_safety(void)
1174 {
1175 #ifdef CONFIG_COREDUMP
1176         if (suid_dumpable == SUID_DUMP_ROOT &&
1177             core_pattern[0] != '/' && core_pattern[0] != '|') {
1178                 printk(KERN_WARNING
1179 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1180 "Pipe handler or fully qualified core dump path required.\n"
1181 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1182                 );
1183         }
1184 #endif
1185 }
1186
1187 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1188                 void *buffer, size_t *lenp, loff_t *ppos)
1189 {
1190         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1191         if (!error)
1192                 validate_coredump_safety();
1193         return error;
1194 }
1195
1196 #ifdef CONFIG_COREDUMP
1197 static int proc_dostring_coredump(struct ctl_table *table, int write,
1198                   void *buffer, size_t *lenp, loff_t *ppos)
1199 {
1200         int error = proc_dostring(table, write, buffer, lenp, ppos);
1201         if (!error)
1202                 validate_coredump_safety();
1203         return error;
1204 }
1205 #endif
1206
1207 #ifdef CONFIG_MAGIC_SYSRQ
1208 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1209                                 void *buffer, size_t *lenp, loff_t *ppos)
1210 {
1211         int tmp, ret;
1212
1213         tmp = sysrq_mask();
1214
1215         ret = __do_proc_dointvec(&tmp, table, write, buffer,
1216                                lenp, ppos, NULL, NULL);
1217         if (ret || !write)
1218                 return ret;
1219
1220         if (write)
1221                 sysrq_toggle_support(tmp);
1222
1223         return 0;
1224 }
1225 #endif
1226
1227 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1228                 int write, void *buffer, size_t *lenp, loff_t *ppos,
1229                 unsigned long convmul, unsigned long convdiv)
1230 {
1231         unsigned long *i, *min, *max;
1232         int vleft, first = 1, err = 0;
1233         size_t left;
1234         char *p;
1235
1236         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1237                 *lenp = 0;
1238                 return 0;
1239         }
1240
1241         i = (unsigned long *) data;
1242         min = (unsigned long *) table->extra1;
1243         max = (unsigned long *) table->extra2;
1244         vleft = table->maxlen / sizeof(unsigned long);
1245         left = *lenp;
1246
1247         if (write) {
1248                 if (proc_first_pos_non_zero_ignore(ppos, table))
1249                         goto out;
1250
1251                 if (left > PAGE_SIZE - 1)
1252                         left = PAGE_SIZE - 1;
1253                 p = buffer;
1254         }
1255
1256         for (; left && vleft--; i++, first = 0) {
1257                 unsigned long val;
1258
1259                 if (write) {
1260                         bool neg;
1261
1262                         left -= proc_skip_spaces(&p);
1263                         if (!left)
1264                                 break;
1265
1266                         err = proc_get_long(&p, &left, &val, &neg,
1267                                              proc_wspace_sep,
1268                                              sizeof(proc_wspace_sep), NULL);
1269                         if (err)
1270                                 break;
1271                         if (neg)
1272                                 continue;
1273                         val = convmul * val / convdiv;
1274                         if ((min && val < *min) || (max && val > *max)) {
1275                                 err = -EINVAL;
1276                                 break;
1277                         }
1278                         *i = val;
1279                 } else {
1280                         val = convdiv * (*i) / convmul;
1281                         if (!first)
1282                                 proc_put_char(&buffer, &left, '\t');
1283                         proc_put_long(&buffer, &left, val, false);
1284                 }
1285         }
1286
1287         if (!write && !first && left && !err)
1288                 proc_put_char(&buffer, &left, '\n');
1289         if (write && !err)
1290                 left -= proc_skip_spaces(&p);
1291         if (write && first)
1292                 return err ? : -EINVAL;
1293         *lenp -= left;
1294 out:
1295         *ppos += *lenp;
1296         return err;
1297 }
1298
1299 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1300                 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1301                 unsigned long convdiv)
1302 {
1303         return __do_proc_doulongvec_minmax(table->data, table, write,
1304                         buffer, lenp, ppos, convmul, convdiv);
1305 }
1306
1307 /**
1308  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1309  * @table: the sysctl table
1310  * @write: %TRUE if this is a write to the sysctl file
1311  * @buffer: the user buffer
1312  * @lenp: the size of the user buffer
1313  * @ppos: file position
1314  *
1315  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1316  * values from/to the user buffer, treated as an ASCII string.
1317  *
1318  * This routine will ensure the values are within the range specified by
1319  * table->extra1 (min) and table->extra2 (max).
1320  *
1321  * Returns 0 on success.
1322  */
1323 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1324                            void *buffer, size_t *lenp, loff_t *ppos)
1325 {
1326     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1327 }
1328
1329 /**
1330  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1331  * @table: the sysctl table
1332  * @write: %TRUE if this is a write to the sysctl file
1333  * @buffer: the user buffer
1334  * @lenp: the size of the user buffer
1335  * @ppos: file position
1336  *
1337  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1338  * values from/to the user buffer, treated as an ASCII string. The values
1339  * are treated as milliseconds, and converted to jiffies when they are stored.
1340  *
1341  * This routine will ensure the values are within the range specified by
1342  * table->extra1 (min) and table->extra2 (max).
1343  *
1344  * Returns 0 on success.
1345  */
1346 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1347                                       void *buffer, size_t *lenp, loff_t *ppos)
1348 {
1349     return do_proc_doulongvec_minmax(table, write, buffer,
1350                                      lenp, ppos, HZ, 1000l);
1351 }
1352
1353
1354 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1355                                          int *valp,
1356                                          int write, void *data)
1357 {
1358         if (write) {
1359                 if (*lvalp > INT_MAX / HZ)
1360                         return 1;
1361                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1362         } else {
1363                 int val = *valp;
1364                 unsigned long lval;
1365                 if (val < 0) {
1366                         *negp = true;
1367                         lval = -(unsigned long)val;
1368                 } else {
1369                         *negp = false;
1370                         lval = (unsigned long)val;
1371                 }
1372                 *lvalp = lval / HZ;
1373         }
1374         return 0;
1375 }
1376
1377 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1378                                                 int *valp,
1379                                                 int write, void *data)
1380 {
1381         if (write) {
1382                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1383                         return 1;
1384                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1385         } else {
1386                 int val = *valp;
1387                 unsigned long lval;
1388                 if (val < 0) {
1389                         *negp = true;
1390                         lval = -(unsigned long)val;
1391                 } else {
1392                         *negp = false;
1393                         lval = (unsigned long)val;
1394                 }
1395                 *lvalp = jiffies_to_clock_t(lval);
1396         }
1397         return 0;
1398 }
1399
1400 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1401                                             int *valp,
1402                                             int write, void *data)
1403 {
1404         if (write) {
1405                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1406
1407                 if (jif > INT_MAX)
1408                         return 1;
1409                 *valp = (int)jif;
1410         } else {
1411                 int val = *valp;
1412                 unsigned long lval;
1413                 if (val < 0) {
1414                         *negp = true;
1415                         lval = -(unsigned long)val;
1416                 } else {
1417                         *negp = false;
1418                         lval = (unsigned long)val;
1419                 }
1420                 *lvalp = jiffies_to_msecs(lval);
1421         }
1422         return 0;
1423 }
1424
1425 /**
1426  * proc_dointvec_jiffies - read a vector of integers as seconds
1427  * @table: the sysctl table
1428  * @write: %TRUE if this is a write to the sysctl file
1429  * @buffer: the user buffer
1430  * @lenp: the size of the user buffer
1431  * @ppos: file position
1432  *
1433  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1434  * values from/to the user buffer, treated as an ASCII string.
1435  * The values read are assumed to be in seconds, and are converted into
1436  * jiffies.
1437  *
1438  * Returns 0 on success.
1439  */
1440 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1441                           void *buffer, size_t *lenp, loff_t *ppos)
1442 {
1443     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1444                             do_proc_dointvec_jiffies_conv,NULL);
1445 }
1446
1447 /**
1448  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1449  * @table: the sysctl table
1450  * @write: %TRUE if this is a write to the sysctl file
1451  * @buffer: the user buffer
1452  * @lenp: the size of the user buffer
1453  * @ppos: pointer to the file position
1454  *
1455  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1456  * values from/to the user buffer, treated as an ASCII string.
1457  * The values read are assumed to be in 1/USER_HZ seconds, and
1458  * are converted into jiffies.
1459  *
1460  * Returns 0 on success.
1461  */
1462 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1463                                  void *buffer, size_t *lenp, loff_t *ppos)
1464 {
1465     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1466                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1467 }
1468
1469 /**
1470  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1471  * @table: the sysctl table
1472  * @write: %TRUE if this is a write to the sysctl file
1473  * @buffer: the user buffer
1474  * @lenp: the size of the user buffer
1475  * @ppos: file position
1476  * @ppos: the current position in the file
1477  *
1478  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1479  * values from/to the user buffer, treated as an ASCII string.
1480  * The values read are assumed to be in 1/1000 seconds, and
1481  * are converted into jiffies.
1482  *
1483  * Returns 0 on success.
1484  */
1485 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1486                 size_t *lenp, loff_t *ppos)
1487 {
1488         return do_proc_dointvec(table, write, buffer, lenp, ppos,
1489                                 do_proc_dointvec_ms_jiffies_conv, NULL);
1490 }
1491
1492 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1493                 size_t *lenp, loff_t *ppos)
1494 {
1495         struct pid *new_pid;
1496         pid_t tmp;
1497         int r;
1498
1499         tmp = pid_vnr(cad_pid);
1500
1501         r = __do_proc_dointvec(&tmp, table, write, buffer,
1502                                lenp, ppos, NULL, NULL);
1503         if (r || !write)
1504                 return r;
1505
1506         new_pid = find_get_pid(tmp);
1507         if (!new_pid)
1508                 return -ESRCH;
1509
1510         put_pid(xchg(&cad_pid, new_pid));
1511         return 0;
1512 }
1513
1514 /**
1515  * proc_do_large_bitmap - read/write from/to a large bitmap
1516  * @table: the sysctl table
1517  * @write: %TRUE if this is a write to the sysctl file
1518  * @buffer: the user buffer
1519  * @lenp: the size of the user buffer
1520  * @ppos: file position
1521  *
1522  * The bitmap is stored at table->data and the bitmap length (in bits)
1523  * in table->maxlen.
1524  *
1525  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1526  * large bitmaps may be represented in a compact manner. Writing into
1527  * the file will clear the bitmap then update it with the given input.
1528  *
1529  * Returns 0 on success.
1530  */
1531 int proc_do_large_bitmap(struct ctl_table *table, int write,
1532                          void *buffer, size_t *lenp, loff_t *ppos)
1533 {
1534         int err = 0;
1535         size_t left = *lenp;
1536         unsigned long bitmap_len = table->maxlen;
1537         unsigned long *bitmap = *(unsigned long **) table->data;
1538         unsigned long *tmp_bitmap = NULL;
1539         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1540
1541         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1542                 *lenp = 0;
1543                 return 0;
1544         }
1545
1546         if (write) {
1547                 char *p = buffer;
1548                 size_t skipped = 0;
1549
1550                 if (left > PAGE_SIZE - 1) {
1551                         left = PAGE_SIZE - 1;
1552                         /* How much of the buffer we'll skip this pass */
1553                         skipped = *lenp - left;
1554                 }
1555
1556                 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1557                 if (!tmp_bitmap)
1558                         return -ENOMEM;
1559                 proc_skip_char(&p, &left, '\n');
1560                 while (!err && left) {
1561                         unsigned long val_a, val_b;
1562                         bool neg;
1563                         size_t saved_left;
1564
1565                         /* In case we stop parsing mid-number, we can reset */
1566                         saved_left = left;
1567                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1568                                              sizeof(tr_a), &c);
1569                         /*
1570                          * If we consumed the entirety of a truncated buffer or
1571                          * only one char is left (may be a "-"), then stop here,
1572                          * reset, & come back for more.
1573                          */
1574                         if ((left <= 1) && skipped) {
1575                                 left = saved_left;
1576                                 break;
1577                         }
1578
1579                         if (err)
1580                                 break;
1581                         if (val_a >= bitmap_len || neg) {
1582                                 err = -EINVAL;
1583                                 break;
1584                         }
1585
1586                         val_b = val_a;
1587                         if (left) {
1588                                 p++;
1589                                 left--;
1590                         }
1591
1592                         if (c == '-') {
1593                                 err = proc_get_long(&p, &left, &val_b,
1594                                                      &neg, tr_b, sizeof(tr_b),
1595                                                      &c);
1596                                 /*
1597                                  * If we consumed all of a truncated buffer or
1598                                  * then stop here, reset, & come back for more.
1599                                  */
1600                                 if (!left && skipped) {
1601                                         left = saved_left;
1602                                         break;
1603                                 }
1604
1605                                 if (err)
1606                                         break;
1607                                 if (val_b >= bitmap_len || neg ||
1608                                     val_a > val_b) {
1609                                         err = -EINVAL;
1610                                         break;
1611                                 }
1612                                 if (left) {
1613                                         p++;
1614                                         left--;
1615                                 }
1616                         }
1617
1618                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1619                         proc_skip_char(&p, &left, '\n');
1620                 }
1621                 left += skipped;
1622         } else {
1623                 unsigned long bit_a, bit_b = 0;
1624                 bool first = 1;
1625
1626                 while (left) {
1627                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1628                         if (bit_a >= bitmap_len)
1629                                 break;
1630                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
1631                                                    bit_a + 1) - 1;
1632
1633                         if (!first)
1634                                 proc_put_char(&buffer, &left, ',');
1635                         proc_put_long(&buffer, &left, bit_a, false);
1636                         if (bit_a != bit_b) {
1637                                 proc_put_char(&buffer, &left, '-');
1638                                 proc_put_long(&buffer, &left, bit_b, false);
1639                         }
1640
1641                         first = 0; bit_b++;
1642                 }
1643                 proc_put_char(&buffer, &left, '\n');
1644         }
1645
1646         if (!err) {
1647                 if (write) {
1648                         if (*ppos)
1649                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1650                         else
1651                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1652                 }
1653                 *lenp -= left;
1654                 *ppos += *lenp;
1655         }
1656
1657         bitmap_free(tmp_bitmap);
1658         return err;
1659 }
1660
1661 #else /* CONFIG_PROC_SYSCTL */
1662
1663 int proc_dostring(struct ctl_table *table, int write,
1664                   void *buffer, size_t *lenp, loff_t *ppos)
1665 {
1666         return -ENOSYS;
1667 }
1668
1669 int proc_dobool(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(struct ctl_table *table, int write,
1676                   void *buffer, size_t *lenp, loff_t *ppos)
1677 {
1678         return -ENOSYS;
1679 }
1680
1681 int proc_douintvec(struct ctl_table *table, int write,
1682                   void *buffer, size_t *lenp, loff_t *ppos)
1683 {
1684         return -ENOSYS;
1685 }
1686
1687 int proc_dointvec_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_douintvec_minmax(struct ctl_table *table, int write,
1694                           void *buffer, size_t *lenp, loff_t *ppos)
1695 {
1696         return -ENOSYS;
1697 }
1698
1699 int proc_dou8vec_minmax(struct ctl_table *table, int write,
1700                         void *buffer, size_t *lenp, loff_t *ppos)
1701 {
1702         return -ENOSYS;
1703 }
1704
1705 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1706                     void *buffer, size_t *lenp, loff_t *ppos)
1707 {
1708         return -ENOSYS;
1709 }
1710
1711 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1712                     void *buffer, size_t *lenp, loff_t *ppos)
1713 {
1714         return -ENOSYS;
1715 }
1716
1717 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1718                              void *buffer, size_t *lenp, loff_t *ppos)
1719 {
1720         return -ENOSYS;
1721 }
1722
1723 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1724                     void *buffer, size_t *lenp, loff_t *ppos)
1725 {
1726         return -ENOSYS;
1727 }
1728
1729 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1730                                       void *buffer, size_t *lenp, loff_t *ppos)
1731 {
1732         return -ENOSYS;
1733 }
1734
1735 int proc_do_large_bitmap(struct ctl_table *table, int write,
1736                          void *buffer, size_t *lenp, loff_t *ppos)
1737 {
1738         return -ENOSYS;
1739 }
1740
1741 #endif /* CONFIG_PROC_SYSCTL */
1742
1743 #if defined(CONFIG_SYSCTL)
1744 int proc_do_static_key(struct ctl_table *table, int write,
1745                        void *buffer, size_t *lenp, loff_t *ppos)
1746 {
1747         struct static_key *key = (struct static_key *)table->data;
1748         static DEFINE_MUTEX(static_key_mutex);
1749         int val, ret;
1750         struct ctl_table tmp = {
1751                 .data   = &val,
1752                 .maxlen = sizeof(val),
1753                 .mode   = table->mode,
1754                 .extra1 = SYSCTL_ZERO,
1755                 .extra2 = SYSCTL_ONE,
1756         };
1757
1758         if (write && !capable(CAP_SYS_ADMIN))
1759                 return -EPERM;
1760
1761         mutex_lock(&static_key_mutex);
1762         val = static_key_enabled(key);
1763         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1764         if (write && !ret) {
1765                 if (val)
1766                         static_key_enable(key);
1767                 else
1768                         static_key_disable(key);
1769         }
1770         mutex_unlock(&static_key_mutex);
1771         return ret;
1772 }
1773
1774 static struct ctl_table kern_table[] = {
1775         {
1776                 .procname       = "sched_child_runs_first",
1777                 .data           = &sysctl_sched_child_runs_first,
1778                 .maxlen         = sizeof(unsigned int),
1779                 .mode           = 0644,
1780                 .proc_handler   = proc_dointvec,
1781         },
1782 #ifdef CONFIG_SCHEDSTATS
1783         {
1784                 .procname       = "sched_schedstats",
1785                 .data           = NULL,
1786                 .maxlen         = sizeof(unsigned int),
1787                 .mode           = 0644,
1788                 .proc_handler   = sysctl_schedstats,
1789                 .extra1         = SYSCTL_ZERO,
1790                 .extra2         = SYSCTL_ONE,
1791         },
1792 #endif /* CONFIG_SCHEDSTATS */
1793 #ifdef CONFIG_TASK_DELAY_ACCT
1794         {
1795                 .procname       = "task_delayacct",
1796                 .data           = NULL,
1797                 .maxlen         = sizeof(unsigned int),
1798                 .mode           = 0644,
1799                 .proc_handler   = sysctl_delayacct,
1800                 .extra1         = SYSCTL_ZERO,
1801                 .extra2         = SYSCTL_ONE,
1802         },
1803 #endif /* CONFIG_TASK_DELAY_ACCT */
1804 #ifdef CONFIG_NUMA_BALANCING
1805         {
1806                 .procname       = "numa_balancing",
1807                 .data           = NULL, /* filled in by handler */
1808                 .maxlen         = sizeof(unsigned int),
1809                 .mode           = 0644,
1810                 .proc_handler   = sysctl_numa_balancing,
1811                 .extra1         = SYSCTL_ZERO,
1812                 .extra2         = SYSCTL_ONE,
1813         },
1814 #endif /* CONFIG_NUMA_BALANCING */
1815         {
1816                 .procname       = "sched_rt_period_us",
1817                 .data           = &sysctl_sched_rt_period,
1818                 .maxlen         = sizeof(unsigned int),
1819                 .mode           = 0644,
1820                 .proc_handler   = sched_rt_handler,
1821         },
1822         {
1823                 .procname       = "sched_rt_runtime_us",
1824                 .data           = &sysctl_sched_rt_runtime,
1825                 .maxlen         = sizeof(int),
1826                 .mode           = 0644,
1827                 .proc_handler   = sched_rt_handler,
1828         },
1829         {
1830                 .procname       = "sched_deadline_period_max_us",
1831                 .data           = &sysctl_sched_dl_period_max,
1832                 .maxlen         = sizeof(unsigned int),
1833                 .mode           = 0644,
1834                 .proc_handler   = proc_dointvec,
1835         },
1836         {
1837                 .procname       = "sched_deadline_period_min_us",
1838                 .data           = &sysctl_sched_dl_period_min,
1839                 .maxlen         = sizeof(unsigned int),
1840                 .mode           = 0644,
1841                 .proc_handler   = proc_dointvec,
1842         },
1843         {
1844                 .procname       = "sched_rr_timeslice_ms",
1845                 .data           = &sysctl_sched_rr_timeslice,
1846                 .maxlen         = sizeof(int),
1847                 .mode           = 0644,
1848                 .proc_handler   = sched_rr_handler,
1849         },
1850 #ifdef CONFIG_UCLAMP_TASK
1851         {
1852                 .procname       = "sched_util_clamp_min",
1853                 .data           = &sysctl_sched_uclamp_util_min,
1854                 .maxlen         = sizeof(unsigned int),
1855                 .mode           = 0644,
1856                 .proc_handler   = sysctl_sched_uclamp_handler,
1857         },
1858         {
1859                 .procname       = "sched_util_clamp_max",
1860                 .data           = &sysctl_sched_uclamp_util_max,
1861                 .maxlen         = sizeof(unsigned int),
1862                 .mode           = 0644,
1863                 .proc_handler   = sysctl_sched_uclamp_handler,
1864         },
1865         {
1866                 .procname       = "sched_util_clamp_min_rt_default",
1867                 .data           = &sysctl_sched_uclamp_util_min_rt_default,
1868                 .maxlen         = sizeof(unsigned int),
1869                 .mode           = 0644,
1870                 .proc_handler   = sysctl_sched_uclamp_handler,
1871         },
1872 #endif
1873 #ifdef CONFIG_SCHED_AUTOGROUP
1874         {
1875                 .procname       = "sched_autogroup_enabled",
1876                 .data           = &sysctl_sched_autogroup_enabled,
1877                 .maxlen         = sizeof(unsigned int),
1878                 .mode           = 0644,
1879                 .proc_handler   = proc_dointvec_minmax,
1880                 .extra1         = SYSCTL_ZERO,
1881                 .extra2         = SYSCTL_ONE,
1882         },
1883 #endif
1884 #ifdef CONFIG_CFS_BANDWIDTH
1885         {
1886                 .procname       = "sched_cfs_bandwidth_slice_us",
1887                 .data           = &sysctl_sched_cfs_bandwidth_slice,
1888                 .maxlen         = sizeof(unsigned int),
1889                 .mode           = 0644,
1890                 .proc_handler   = proc_dointvec_minmax,
1891                 .extra1         = SYSCTL_ONE,
1892         },
1893 #endif
1894 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1895         {
1896                 .procname       = "sched_energy_aware",
1897                 .data           = &sysctl_sched_energy_aware,
1898                 .maxlen         = sizeof(unsigned int),
1899                 .mode           = 0644,
1900                 .proc_handler   = sched_energy_aware_handler,
1901                 .extra1         = SYSCTL_ZERO,
1902                 .extra2         = SYSCTL_ONE,
1903         },
1904 #endif
1905 #ifdef CONFIG_PROVE_LOCKING
1906         {
1907                 .procname       = "prove_locking",
1908                 .data           = &prove_locking,
1909                 .maxlen         = sizeof(int),
1910                 .mode           = 0644,
1911                 .proc_handler   = proc_dointvec,
1912         },
1913 #endif
1914 #ifdef CONFIG_LOCK_STAT
1915         {
1916                 .procname       = "lock_stat",
1917                 .data           = &lock_stat,
1918                 .maxlen         = sizeof(int),
1919                 .mode           = 0644,
1920                 .proc_handler   = proc_dointvec,
1921         },
1922 #endif
1923         {
1924                 .procname       = "panic",
1925                 .data           = &panic_timeout,
1926                 .maxlen         = sizeof(int),
1927                 .mode           = 0644,
1928                 .proc_handler   = proc_dointvec,
1929         },
1930 #ifdef CONFIG_COREDUMP
1931         {
1932                 .procname       = "core_uses_pid",
1933                 .data           = &core_uses_pid,
1934                 .maxlen         = sizeof(int),
1935                 .mode           = 0644,
1936                 .proc_handler   = proc_dointvec,
1937         },
1938         {
1939                 .procname       = "core_pattern",
1940                 .data           = core_pattern,
1941                 .maxlen         = CORENAME_MAX_SIZE,
1942                 .mode           = 0644,
1943                 .proc_handler   = proc_dostring_coredump,
1944         },
1945         {
1946                 .procname       = "core_pipe_limit",
1947                 .data           = &core_pipe_limit,
1948                 .maxlen         = sizeof(unsigned int),
1949                 .mode           = 0644,
1950                 .proc_handler   = proc_dointvec,
1951         },
1952 #endif
1953 #ifdef CONFIG_PROC_SYSCTL
1954         {
1955                 .procname       = "tainted",
1956                 .maxlen         = sizeof(long),
1957                 .mode           = 0644,
1958                 .proc_handler   = proc_taint,
1959         },
1960         {
1961                 .procname       = "sysctl_writes_strict",
1962                 .data           = &sysctl_writes_strict,
1963                 .maxlen         = sizeof(int),
1964                 .mode           = 0644,
1965                 .proc_handler   = proc_dointvec_minmax,
1966                 .extra1         = &neg_one,
1967                 .extra2         = SYSCTL_ONE,
1968         },
1969 #endif
1970 #ifdef CONFIG_LATENCYTOP
1971         {
1972                 .procname       = "latencytop",
1973                 .data           = &latencytop_enabled,
1974                 .maxlen         = sizeof(int),
1975                 .mode           = 0644,
1976                 .proc_handler   = sysctl_latencytop,
1977         },
1978 #endif
1979 #ifdef CONFIG_BLK_DEV_INITRD
1980         {
1981                 .procname       = "real-root-dev",
1982                 .data           = &real_root_dev,
1983                 .maxlen         = sizeof(int),
1984                 .mode           = 0644,
1985                 .proc_handler   = proc_dointvec,
1986         },
1987 #endif
1988         {
1989                 .procname       = "print-fatal-signals",
1990                 .data           = &print_fatal_signals,
1991                 .maxlen         = sizeof(int),
1992                 .mode           = 0644,
1993                 .proc_handler   = proc_dointvec,
1994         },
1995 #ifdef CONFIG_SPARC
1996         {
1997                 .procname       = "reboot-cmd",
1998                 .data           = reboot_command,
1999                 .maxlen         = 256,
2000                 .mode           = 0644,
2001                 .proc_handler   = proc_dostring,
2002         },
2003         {
2004                 .procname       = "stop-a",
2005                 .data           = &stop_a_enabled,
2006                 .maxlen         = sizeof (int),
2007                 .mode           = 0644,
2008                 .proc_handler   = proc_dointvec,
2009         },
2010         {
2011                 .procname       = "scons-poweroff",
2012                 .data           = &scons_pwroff,
2013                 .maxlen         = sizeof (int),
2014                 .mode           = 0644,
2015                 .proc_handler   = proc_dointvec,
2016         },
2017 #endif
2018 #ifdef CONFIG_SPARC64
2019         {
2020                 .procname       = "tsb-ratio",
2021                 .data           = &sysctl_tsb_ratio,
2022                 .maxlen         = sizeof (int),
2023                 .mode           = 0644,
2024                 .proc_handler   = proc_dointvec,
2025         },
2026 #endif
2027 #ifdef CONFIG_PARISC
2028         {
2029                 .procname       = "soft-power",
2030                 .data           = &pwrsw_enabled,
2031                 .maxlen         = sizeof (int),
2032                 .mode           = 0644,
2033                 .proc_handler   = proc_dointvec,
2034         },
2035 #endif
2036 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
2037         {
2038                 .procname       = "unaligned-trap",
2039                 .data           = &unaligned_enabled,
2040                 .maxlen         = sizeof (int),
2041                 .mode           = 0644,
2042                 .proc_handler   = proc_dointvec,
2043         },
2044 #endif
2045         {
2046                 .procname       = "ctrl-alt-del",
2047                 .data           = &C_A_D,
2048                 .maxlen         = sizeof(int),
2049                 .mode           = 0644,
2050                 .proc_handler   = proc_dointvec,
2051         },
2052 #ifdef CONFIG_FUNCTION_TRACER
2053         {
2054                 .procname       = "ftrace_enabled",
2055                 .data           = &ftrace_enabled,
2056                 .maxlen         = sizeof(int),
2057                 .mode           = 0644,
2058                 .proc_handler   = ftrace_enable_sysctl,
2059         },
2060 #endif
2061 #ifdef CONFIG_STACK_TRACER
2062         {
2063                 .procname       = "stack_tracer_enabled",
2064                 .data           = &stack_tracer_enabled,
2065                 .maxlen         = sizeof(int),
2066                 .mode           = 0644,
2067                 .proc_handler   = stack_trace_sysctl,
2068         },
2069 #endif
2070 #ifdef CONFIG_TRACING
2071         {
2072                 .procname       = "ftrace_dump_on_oops",
2073                 .data           = &ftrace_dump_on_oops,
2074                 .maxlen         = sizeof(int),
2075                 .mode           = 0644,
2076                 .proc_handler   = proc_dointvec,
2077         },
2078         {
2079                 .procname       = "traceoff_on_warning",
2080                 .data           = &__disable_trace_on_warning,
2081                 .maxlen         = sizeof(__disable_trace_on_warning),
2082                 .mode           = 0644,
2083                 .proc_handler   = proc_dointvec,
2084         },
2085         {
2086                 .procname       = "tracepoint_printk",
2087                 .data           = &tracepoint_printk,
2088                 .maxlen         = sizeof(tracepoint_printk),
2089                 .mode           = 0644,
2090                 .proc_handler   = tracepoint_printk_sysctl,
2091         },
2092 #endif
2093 #ifdef CONFIG_KEXEC_CORE
2094         {
2095                 .procname       = "kexec_load_disabled",
2096                 .data           = &kexec_load_disabled,
2097                 .maxlen         = sizeof(int),
2098                 .mode           = 0644,
2099                 /* only handle a transition from default "0" to "1" */
2100                 .proc_handler   = proc_dointvec_minmax,
2101                 .extra1         = SYSCTL_ONE,
2102                 .extra2         = SYSCTL_ONE,
2103         },
2104 #endif
2105 #ifdef CONFIG_MODULES
2106         {
2107                 .procname       = "modprobe",
2108                 .data           = &modprobe_path,
2109                 .maxlen         = KMOD_PATH_LEN,
2110                 .mode           = 0644,
2111                 .proc_handler   = proc_dostring,
2112         },
2113         {
2114                 .procname       = "modules_disabled",
2115                 .data           = &modules_disabled,
2116                 .maxlen         = sizeof(int),
2117                 .mode           = 0644,
2118                 /* only handle a transition from default "0" to "1" */
2119                 .proc_handler   = proc_dointvec_minmax,
2120                 .extra1         = SYSCTL_ONE,
2121                 .extra2         = SYSCTL_ONE,
2122         },
2123 #endif
2124 #ifdef CONFIG_UEVENT_HELPER
2125         {
2126                 .procname       = "hotplug",
2127                 .data           = &uevent_helper,
2128                 .maxlen         = UEVENT_HELPER_PATH_LEN,
2129                 .mode           = 0644,
2130                 .proc_handler   = proc_dostring,
2131         },
2132 #endif
2133 #ifdef CONFIG_CHR_DEV_SG
2134         {
2135                 .procname       = "sg-big-buff",
2136                 .data           = &sg_big_buff,
2137                 .maxlen         = sizeof (int),
2138                 .mode           = 0444,
2139                 .proc_handler   = proc_dointvec,
2140         },
2141 #endif
2142 #ifdef CONFIG_BSD_PROCESS_ACCT
2143         {
2144                 .procname       = "acct",
2145                 .data           = &acct_parm,
2146                 .maxlen         = 3*sizeof(int),
2147                 .mode           = 0644,
2148                 .proc_handler   = proc_dointvec,
2149         },
2150 #endif
2151 #ifdef CONFIG_MAGIC_SYSRQ
2152         {
2153                 .procname       = "sysrq",
2154                 .data           = NULL,
2155                 .maxlen         = sizeof (int),
2156                 .mode           = 0644,
2157                 .proc_handler   = sysrq_sysctl_handler,
2158         },
2159 #endif
2160 #ifdef CONFIG_PROC_SYSCTL
2161         {
2162                 .procname       = "cad_pid",
2163                 .data           = NULL,
2164                 .maxlen         = sizeof (int),
2165                 .mode           = 0600,
2166                 .proc_handler   = proc_do_cad_pid,
2167         },
2168 #endif
2169         {
2170                 .procname       = "threads-max",
2171                 .data           = NULL,
2172                 .maxlen         = sizeof(int),
2173                 .mode           = 0644,
2174                 .proc_handler   = sysctl_max_threads,
2175         },
2176         {
2177                 .procname       = "random",
2178                 .mode           = 0555,
2179                 .child          = random_table,
2180         },
2181         {
2182                 .procname       = "usermodehelper",
2183                 .mode           = 0555,
2184                 .child          = usermodehelper_table,
2185         },
2186 #ifdef CONFIG_FW_LOADER_USER_HELPER
2187         {
2188                 .procname       = "firmware_config",
2189                 .mode           = 0555,
2190                 .child          = firmware_config_table,
2191         },
2192 #endif
2193         {
2194                 .procname       = "overflowuid",
2195                 .data           = &overflowuid,
2196                 .maxlen         = sizeof(int),
2197                 .mode           = 0644,
2198                 .proc_handler   = proc_dointvec_minmax,
2199                 .extra1         = &minolduid,
2200                 .extra2         = &maxolduid,
2201         },
2202         {
2203                 .procname       = "overflowgid",
2204                 .data           = &overflowgid,
2205                 .maxlen         = sizeof(int),
2206                 .mode           = 0644,
2207                 .proc_handler   = proc_dointvec_minmax,
2208                 .extra1         = &minolduid,
2209                 .extra2         = &maxolduid,
2210         },
2211 #ifdef CONFIG_S390
2212         {
2213                 .procname       = "userprocess_debug",
2214                 .data           = &show_unhandled_signals,
2215                 .maxlen         = sizeof(int),
2216                 .mode           = 0644,
2217                 .proc_handler   = proc_dointvec,
2218         },
2219 #endif
2220 #ifdef CONFIG_SMP
2221         {
2222                 .procname       = "oops_all_cpu_backtrace",
2223                 .data           = &sysctl_oops_all_cpu_backtrace,
2224                 .maxlen         = sizeof(int),
2225                 .mode           = 0644,
2226                 .proc_handler   = proc_dointvec_minmax,
2227                 .extra1         = SYSCTL_ZERO,
2228                 .extra2         = SYSCTL_ONE,
2229         },
2230 #endif /* CONFIG_SMP */
2231         {
2232                 .procname       = "pid_max",
2233                 .data           = &pid_max,
2234                 .maxlen         = sizeof (int),
2235                 .mode           = 0644,
2236                 .proc_handler   = proc_dointvec_minmax,
2237                 .extra1         = &pid_max_min,
2238                 .extra2         = &pid_max_max,
2239         },
2240         {
2241                 .procname       = "panic_on_oops",
2242                 .data           = &panic_on_oops,
2243                 .maxlen         = sizeof(int),
2244                 .mode           = 0644,
2245                 .proc_handler   = proc_dointvec,
2246         },
2247         {
2248                 .procname       = "panic_print",
2249                 .data           = &panic_print,
2250                 .maxlen         = sizeof(unsigned long),
2251                 .mode           = 0644,
2252                 .proc_handler   = proc_doulongvec_minmax,
2253         },
2254 #if defined CONFIG_PRINTK
2255         {
2256                 .procname       = "printk",
2257                 .data           = &console_loglevel,
2258                 .maxlen         = 4*sizeof(int),
2259                 .mode           = 0644,
2260                 .proc_handler   = proc_dointvec,
2261         },
2262         {
2263                 .procname       = "printk_ratelimit",
2264                 .data           = &printk_ratelimit_state.interval,
2265                 .maxlen         = sizeof(int),
2266                 .mode           = 0644,
2267                 .proc_handler   = proc_dointvec_jiffies,
2268         },
2269         {
2270                 .procname       = "printk_ratelimit_burst",
2271                 .data           = &printk_ratelimit_state.burst,
2272                 .maxlen         = sizeof(int),
2273                 .mode           = 0644,
2274                 .proc_handler   = proc_dointvec,
2275         },
2276         {
2277                 .procname       = "printk_delay",
2278                 .data           = &printk_delay_msec,
2279                 .maxlen         = sizeof(int),
2280                 .mode           = 0644,
2281                 .proc_handler   = proc_dointvec_minmax,
2282                 .extra1         = SYSCTL_ZERO,
2283                 .extra2         = &ten_thousand,
2284         },
2285         {
2286                 .procname       = "printk_devkmsg",
2287                 .data           = devkmsg_log_str,
2288                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
2289                 .mode           = 0644,
2290                 .proc_handler   = devkmsg_sysctl_set_loglvl,
2291         },
2292         {
2293                 .procname       = "dmesg_restrict",
2294                 .data           = &dmesg_restrict,
2295                 .maxlen         = sizeof(int),
2296                 .mode           = 0644,
2297                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2298                 .extra1         = SYSCTL_ZERO,
2299                 .extra2         = SYSCTL_ONE,
2300         },
2301         {
2302                 .procname       = "kptr_restrict",
2303                 .data           = &kptr_restrict,
2304                 .maxlen         = sizeof(int),
2305                 .mode           = 0644,
2306                 .proc_handler   = proc_dointvec_minmax_sysadmin,
2307                 .extra1         = SYSCTL_ZERO,
2308                 .extra2         = &two,
2309         },
2310 #endif
2311         {
2312                 .procname       = "ngroups_max",
2313                 .data           = &ngroups_max,
2314                 .maxlen         = sizeof (int),
2315                 .mode           = 0444,
2316                 .proc_handler   = proc_dointvec,
2317         },
2318         {
2319                 .procname       = "cap_last_cap",
2320                 .data           = (void *)&cap_last_cap,
2321                 .maxlen         = sizeof(int),
2322                 .mode           = 0444,
2323                 .proc_handler   = proc_dointvec,
2324         },
2325 #if defined(CONFIG_LOCKUP_DETECTOR)
2326         {
2327                 .procname       = "watchdog",
2328                 .data           = &watchdog_user_enabled,
2329                 .maxlen         = sizeof(int),
2330                 .mode           = 0644,
2331                 .proc_handler   = proc_watchdog,
2332                 .extra1         = SYSCTL_ZERO,
2333                 .extra2         = SYSCTL_ONE,
2334         },
2335         {
2336                 .procname       = "watchdog_thresh",
2337                 .data           = &watchdog_thresh,
2338                 .maxlen         = sizeof(int),
2339                 .mode           = 0644,
2340                 .proc_handler   = proc_watchdog_thresh,
2341                 .extra1         = SYSCTL_ZERO,
2342                 .extra2         = &sixty,
2343         },
2344         {
2345                 .procname       = "nmi_watchdog",
2346                 .data           = &nmi_watchdog_user_enabled,
2347                 .maxlen         = sizeof(int),
2348                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
2349                 .proc_handler   = proc_nmi_watchdog,
2350                 .extra1         = SYSCTL_ZERO,
2351                 .extra2         = SYSCTL_ONE,
2352         },
2353         {
2354                 .procname       = "watchdog_cpumask",
2355                 .data           = &watchdog_cpumask_bits,
2356                 .maxlen         = NR_CPUS,
2357                 .mode           = 0644,
2358                 .proc_handler   = proc_watchdog_cpumask,
2359         },
2360 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2361         {
2362                 .procname       = "soft_watchdog",
2363                 .data           = &soft_watchdog_user_enabled,
2364                 .maxlen         = sizeof(int),
2365                 .mode           = 0644,
2366                 .proc_handler   = proc_soft_watchdog,
2367                 .extra1         = SYSCTL_ZERO,
2368                 .extra2         = SYSCTL_ONE,
2369         },
2370         {
2371                 .procname       = "softlockup_panic",
2372                 .data           = &softlockup_panic,
2373                 .maxlen         = sizeof(int),
2374                 .mode           = 0644,
2375                 .proc_handler   = proc_dointvec_minmax,
2376                 .extra1         = SYSCTL_ZERO,
2377                 .extra2         = SYSCTL_ONE,
2378         },
2379 #ifdef CONFIG_SMP
2380         {
2381                 .procname       = "softlockup_all_cpu_backtrace",
2382                 .data           = &sysctl_softlockup_all_cpu_backtrace,
2383                 .maxlen         = sizeof(int),
2384                 .mode           = 0644,
2385                 .proc_handler   = proc_dointvec_minmax,
2386                 .extra1         = SYSCTL_ZERO,
2387                 .extra2         = SYSCTL_ONE,
2388         },
2389 #endif /* CONFIG_SMP */
2390 #endif
2391 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2392         {
2393                 .procname       = "hardlockup_panic",
2394                 .data           = &hardlockup_panic,
2395                 .maxlen         = sizeof(int),
2396                 .mode           = 0644,
2397                 .proc_handler   = proc_dointvec_minmax,
2398                 .extra1         = SYSCTL_ZERO,
2399                 .extra2         = SYSCTL_ONE,
2400         },
2401 #ifdef CONFIG_SMP
2402         {
2403                 .procname       = "hardlockup_all_cpu_backtrace",
2404                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
2405                 .maxlen         = sizeof(int),
2406                 .mode           = 0644,
2407                 .proc_handler   = proc_dointvec_minmax,
2408                 .extra1         = SYSCTL_ZERO,
2409                 .extra2         = SYSCTL_ONE,
2410         },
2411 #endif /* CONFIG_SMP */
2412 #endif
2413 #endif
2414
2415 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2416         {
2417                 .procname       = "unknown_nmi_panic",
2418                 .data           = &unknown_nmi_panic,
2419                 .maxlen         = sizeof (int),
2420                 .mode           = 0644,
2421                 .proc_handler   = proc_dointvec,
2422         },
2423 #endif
2424
2425 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2426         defined(CONFIG_DEBUG_STACKOVERFLOW)
2427         {
2428                 .procname       = "panic_on_stackoverflow",
2429                 .data           = &sysctl_panic_on_stackoverflow,
2430                 .maxlen         = sizeof(int),
2431                 .mode           = 0644,
2432                 .proc_handler   = proc_dointvec,
2433         },
2434 #endif
2435 #if defined(CONFIG_X86)
2436         {
2437                 .procname       = "panic_on_unrecovered_nmi",
2438                 .data           = &panic_on_unrecovered_nmi,
2439                 .maxlen         = sizeof(int),
2440                 .mode           = 0644,
2441                 .proc_handler   = proc_dointvec,
2442         },
2443         {
2444                 .procname       = "panic_on_io_nmi",
2445                 .data           = &panic_on_io_nmi,
2446                 .maxlen         = sizeof(int),
2447                 .mode           = 0644,
2448                 .proc_handler   = proc_dointvec,
2449         },
2450         {
2451                 .procname       = "bootloader_type",
2452                 .data           = &bootloader_type,
2453                 .maxlen         = sizeof (int),
2454                 .mode           = 0444,
2455                 .proc_handler   = proc_dointvec,
2456         },
2457         {
2458                 .procname       = "bootloader_version",
2459                 .data           = &bootloader_version,
2460                 .maxlen         = sizeof (int),
2461                 .mode           = 0444,
2462                 .proc_handler   = proc_dointvec,
2463         },
2464         {
2465                 .procname       = "io_delay_type",
2466                 .data           = &io_delay_type,
2467                 .maxlen         = sizeof(int),
2468                 .mode           = 0644,
2469                 .proc_handler   = proc_dointvec,
2470         },
2471 #endif
2472 #if defined(CONFIG_MMU)
2473         {
2474                 .procname       = "randomize_va_space",
2475                 .data           = &randomize_va_space,
2476                 .maxlen         = sizeof(int),
2477                 .mode           = 0644,
2478                 .proc_handler   = proc_dointvec,
2479         },
2480 #endif
2481 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2482         {
2483                 .procname       = "spin_retry",
2484                 .data           = &spin_retry,
2485                 .maxlen         = sizeof (int),
2486                 .mode           = 0644,
2487                 .proc_handler   = proc_dointvec,
2488         },
2489 #endif
2490 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2491         {
2492                 .procname       = "acpi_video_flags",
2493                 .data           = &acpi_realmode_flags,
2494                 .maxlen         = sizeof (unsigned long),
2495                 .mode           = 0644,
2496                 .proc_handler   = proc_doulongvec_minmax,
2497         },
2498 #endif
2499 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2500         {
2501                 .procname       = "ignore-unaligned-usertrap",
2502                 .data           = &no_unaligned_warning,
2503                 .maxlen         = sizeof (int),
2504                 .mode           = 0644,
2505                 .proc_handler   = proc_dointvec,
2506         },
2507 #endif
2508 #ifdef CONFIG_IA64
2509         {
2510                 .procname       = "unaligned-dump-stack",
2511                 .data           = &unaligned_dump_stack,
2512                 .maxlen         = sizeof (int),
2513                 .mode           = 0644,
2514                 .proc_handler   = proc_dointvec,
2515         },
2516 #endif
2517 #ifdef CONFIG_DETECT_HUNG_TASK
2518 #ifdef CONFIG_SMP
2519         {
2520                 .procname       = "hung_task_all_cpu_backtrace",
2521                 .data           = &sysctl_hung_task_all_cpu_backtrace,
2522                 .maxlen         = sizeof(int),
2523                 .mode           = 0644,
2524                 .proc_handler   = proc_dointvec_minmax,
2525                 .extra1         = SYSCTL_ZERO,
2526                 .extra2         = SYSCTL_ONE,
2527         },
2528 #endif /* CONFIG_SMP */
2529         {
2530                 .procname       = "hung_task_panic",
2531                 .data           = &sysctl_hung_task_panic,
2532                 .maxlen         = sizeof(int),
2533                 .mode           = 0644,
2534                 .proc_handler   = proc_dointvec_minmax,
2535                 .extra1         = SYSCTL_ZERO,
2536                 .extra2         = SYSCTL_ONE,
2537         },
2538         {
2539                 .procname       = "hung_task_check_count",
2540                 .data           = &sysctl_hung_task_check_count,
2541                 .maxlen         = sizeof(int),
2542                 .mode           = 0644,
2543                 .proc_handler   = proc_dointvec_minmax,
2544                 .extra1         = SYSCTL_ZERO,
2545         },
2546         {
2547                 .procname       = "hung_task_timeout_secs",
2548                 .data           = &sysctl_hung_task_timeout_secs,
2549                 .maxlen         = sizeof(unsigned long),
2550                 .mode           = 0644,
2551                 .proc_handler   = proc_dohung_task_timeout_secs,
2552                 .extra2         = &hung_task_timeout_max,
2553         },
2554         {
2555                 .procname       = "hung_task_check_interval_secs",
2556                 .data           = &sysctl_hung_task_check_interval_secs,
2557                 .maxlen         = sizeof(unsigned long),
2558                 .mode           = 0644,
2559                 .proc_handler   = proc_dohung_task_timeout_secs,
2560                 .extra2         = &hung_task_timeout_max,
2561         },
2562         {
2563                 .procname       = "hung_task_warnings",
2564                 .data           = &sysctl_hung_task_warnings,
2565                 .maxlen         = sizeof(int),
2566                 .mode           = 0644,
2567                 .proc_handler   = proc_dointvec_minmax,
2568                 .extra1         = &neg_one,
2569         },
2570 #endif
2571 #ifdef CONFIG_RT_MUTEXES
2572         {
2573                 .procname       = "max_lock_depth",
2574                 .data           = &max_lock_depth,
2575                 .maxlen         = sizeof(int),
2576                 .mode           = 0644,
2577                 .proc_handler   = proc_dointvec,
2578         },
2579 #endif
2580         {
2581                 .procname       = "poweroff_cmd",
2582                 .data           = &poweroff_cmd,
2583                 .maxlen         = POWEROFF_CMD_PATH_LEN,
2584                 .mode           = 0644,
2585                 .proc_handler   = proc_dostring,
2586         },
2587 #ifdef CONFIG_KEYS
2588         {
2589                 .procname       = "keys",
2590                 .mode           = 0555,
2591                 .child          = key_sysctls,
2592         },
2593 #endif
2594 #ifdef CONFIG_PERF_EVENTS
2595         /*
2596          * User-space scripts rely on the existence of this file
2597          * as a feature check for perf_events being enabled.
2598          *
2599          * So it's an ABI, do not remove!
2600          */
2601         {
2602                 .procname       = "perf_event_paranoid",
2603                 .data           = &sysctl_perf_event_paranoid,
2604                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
2605                 .mode           = 0644,
2606                 .proc_handler   = proc_dointvec,
2607         },
2608         {
2609                 .procname       = "perf_event_mlock_kb",
2610                 .data           = &sysctl_perf_event_mlock,
2611                 .maxlen         = sizeof(sysctl_perf_event_mlock),
2612                 .mode           = 0644,
2613                 .proc_handler   = proc_dointvec,
2614         },
2615         {
2616                 .procname       = "perf_event_max_sample_rate",
2617                 .data           = &sysctl_perf_event_sample_rate,
2618                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
2619                 .mode           = 0644,
2620                 .proc_handler   = perf_proc_update_handler,
2621                 .extra1         = SYSCTL_ONE,
2622         },
2623         {
2624                 .procname       = "perf_cpu_time_max_percent",
2625                 .data           = &sysctl_perf_cpu_time_max_percent,
2626                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
2627                 .mode           = 0644,
2628                 .proc_handler   = perf_cpu_time_max_percent_handler,
2629                 .extra1         = SYSCTL_ZERO,
2630                 .extra2         = &one_hundred,
2631         },
2632         {
2633                 .procname       = "perf_event_max_stack",
2634                 .data           = &sysctl_perf_event_max_stack,
2635                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
2636                 .mode           = 0644,
2637                 .proc_handler   = perf_event_max_stack_handler,
2638                 .extra1         = SYSCTL_ZERO,
2639                 .extra2         = &six_hundred_forty_kb,
2640         },
2641         {
2642                 .procname       = "perf_event_max_contexts_per_stack",
2643                 .data           = &sysctl_perf_event_max_contexts_per_stack,
2644                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
2645                 .mode           = 0644,
2646                 .proc_handler   = perf_event_max_stack_handler,
2647                 .extra1         = SYSCTL_ZERO,
2648                 .extra2         = &one_thousand,
2649         },
2650 #endif
2651         {
2652                 .procname       = "panic_on_warn",
2653                 .data           = &panic_on_warn,
2654                 .maxlen         = sizeof(int),
2655                 .mode           = 0644,
2656                 .proc_handler   = proc_dointvec_minmax,
2657                 .extra1         = SYSCTL_ZERO,
2658                 .extra2         = SYSCTL_ONE,
2659         },
2660 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2661         {
2662                 .procname       = "timer_migration",
2663                 .data           = &sysctl_timer_migration,
2664                 .maxlen         = sizeof(unsigned int),
2665                 .mode           = 0644,
2666                 .proc_handler   = timer_migration_handler,
2667                 .extra1         = SYSCTL_ZERO,
2668                 .extra2         = SYSCTL_ONE,
2669         },
2670 #endif
2671 #ifdef CONFIG_BPF_SYSCALL
2672         {
2673                 .procname       = "unprivileged_bpf_disabled",
2674                 .data           = &sysctl_unprivileged_bpf_disabled,
2675                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
2676                 .mode           = 0644,
2677                 .proc_handler   = bpf_unpriv_handler,
2678                 .extra1         = SYSCTL_ZERO,
2679                 .extra2         = &two,
2680         },
2681         {
2682                 .procname       = "bpf_stats_enabled",
2683                 .data           = &bpf_stats_enabled_key.key,
2684                 .maxlen         = sizeof(bpf_stats_enabled_key),
2685                 .mode           = 0644,
2686                 .proc_handler   = bpf_stats_handler,
2687         },
2688 #endif
2689 #if defined(CONFIG_TREE_RCU)
2690         {
2691                 .procname       = "panic_on_rcu_stall",
2692                 .data           = &sysctl_panic_on_rcu_stall,
2693                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
2694                 .mode           = 0644,
2695                 .proc_handler   = proc_dointvec_minmax,
2696                 .extra1         = SYSCTL_ZERO,
2697                 .extra2         = SYSCTL_ONE,
2698         },
2699 #endif
2700 #if defined(CONFIG_TREE_RCU)
2701         {
2702                 .procname       = "max_rcu_stall_to_panic",
2703                 .data           = &sysctl_max_rcu_stall_to_panic,
2704                 .maxlen         = sizeof(sysctl_max_rcu_stall_to_panic),
2705                 .mode           = 0644,
2706                 .proc_handler   = proc_dointvec_minmax,
2707                 .extra1         = SYSCTL_ONE,
2708                 .extra2         = SYSCTL_INT_MAX,
2709         },
2710 #endif
2711 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2712         {
2713                 .procname       = "stack_erasing",
2714                 .data           = NULL,
2715                 .maxlen         = sizeof(int),
2716                 .mode           = 0600,
2717                 .proc_handler   = stack_erasing_sysctl,
2718                 .extra1         = SYSCTL_ZERO,
2719                 .extra2         = SYSCTL_ONE,
2720         },
2721 #endif
2722         { }
2723 };
2724
2725 static struct ctl_table vm_table[] = {
2726         {
2727                 .procname       = "overcommit_memory",
2728                 .data           = &sysctl_overcommit_memory,
2729                 .maxlen         = sizeof(sysctl_overcommit_memory),
2730                 .mode           = 0644,
2731                 .proc_handler   = overcommit_policy_handler,
2732                 .extra1         = SYSCTL_ZERO,
2733                 .extra2         = &two,
2734         },
2735         {
2736                 .procname       = "panic_on_oom",
2737                 .data           = &sysctl_panic_on_oom,
2738                 .maxlen         = sizeof(sysctl_panic_on_oom),
2739                 .mode           = 0644,
2740                 .proc_handler   = proc_dointvec_minmax,
2741                 .extra1         = SYSCTL_ZERO,
2742                 .extra2         = &two,
2743         },
2744         {
2745                 .procname       = "oom_kill_allocating_task",
2746                 .data           = &sysctl_oom_kill_allocating_task,
2747                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
2748                 .mode           = 0644,
2749                 .proc_handler   = proc_dointvec,
2750         },
2751         {
2752                 .procname       = "oom_dump_tasks",
2753                 .data           = &sysctl_oom_dump_tasks,
2754                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
2755                 .mode           = 0644,
2756                 .proc_handler   = proc_dointvec,
2757         },
2758         {
2759                 .procname       = "overcommit_ratio",
2760                 .data           = &sysctl_overcommit_ratio,
2761                 .maxlen         = sizeof(sysctl_overcommit_ratio),
2762                 .mode           = 0644,
2763                 .proc_handler   = overcommit_ratio_handler,
2764         },
2765         {
2766                 .procname       = "overcommit_kbytes",
2767                 .data           = &sysctl_overcommit_kbytes,
2768                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
2769                 .mode           = 0644,
2770                 .proc_handler   = overcommit_kbytes_handler,
2771         },
2772         {
2773                 .procname       = "page-cluster",
2774                 .data           = &page_cluster,
2775                 .maxlen         = sizeof(int),
2776                 .mode           = 0644,
2777                 .proc_handler   = proc_dointvec_minmax,
2778                 .extra1         = SYSCTL_ZERO,
2779         },
2780         {
2781                 .procname       = "dirty_background_ratio",
2782                 .data           = &dirty_background_ratio,
2783                 .maxlen         = sizeof(dirty_background_ratio),
2784                 .mode           = 0644,
2785                 .proc_handler   = dirty_background_ratio_handler,
2786                 .extra1         = SYSCTL_ZERO,
2787                 .extra2         = &one_hundred,
2788         },
2789         {
2790                 .procname       = "dirty_background_bytes",
2791                 .data           = &dirty_background_bytes,
2792                 .maxlen         = sizeof(dirty_background_bytes),
2793                 .mode           = 0644,
2794                 .proc_handler   = dirty_background_bytes_handler,
2795                 .extra1         = &one_ul,
2796         },
2797         {
2798                 .procname       = "dirty_ratio",
2799                 .data           = &vm_dirty_ratio,
2800                 .maxlen         = sizeof(vm_dirty_ratio),
2801                 .mode           = 0644,
2802                 .proc_handler   = dirty_ratio_handler,
2803                 .extra1         = SYSCTL_ZERO,
2804                 .extra2         = &one_hundred,
2805         },
2806         {
2807                 .procname       = "dirty_bytes",
2808                 .data           = &vm_dirty_bytes,
2809                 .maxlen         = sizeof(vm_dirty_bytes),
2810                 .mode           = 0644,
2811                 .proc_handler   = dirty_bytes_handler,
2812                 .extra1         = &dirty_bytes_min,
2813         },
2814         {
2815                 .procname       = "dirty_writeback_centisecs",
2816                 .data           = &dirty_writeback_interval,
2817                 .maxlen         = sizeof(dirty_writeback_interval),
2818                 .mode           = 0644,
2819                 .proc_handler   = dirty_writeback_centisecs_handler,
2820         },
2821         {
2822                 .procname       = "dirty_expire_centisecs",
2823                 .data           = &dirty_expire_interval,
2824                 .maxlen         = sizeof(dirty_expire_interval),
2825                 .mode           = 0644,
2826                 .proc_handler   = proc_dointvec_minmax,
2827                 .extra1         = SYSCTL_ZERO,
2828         },
2829         {
2830                 .procname       = "dirtytime_expire_seconds",
2831                 .data           = &dirtytime_expire_interval,
2832                 .maxlen         = sizeof(dirtytime_expire_interval),
2833                 .mode           = 0644,
2834                 .proc_handler   = dirtytime_interval_handler,
2835                 .extra1         = SYSCTL_ZERO,
2836         },
2837         {
2838                 .procname       = "swappiness",
2839                 .data           = &vm_swappiness,
2840                 .maxlen         = sizeof(vm_swappiness),
2841                 .mode           = 0644,
2842                 .proc_handler   = proc_dointvec_minmax,
2843                 .extra1         = SYSCTL_ZERO,
2844                 .extra2         = &two_hundred,
2845         },
2846 #ifdef CONFIG_HUGETLB_PAGE
2847         {
2848                 .procname       = "nr_hugepages",
2849                 .data           = NULL,
2850                 .maxlen         = sizeof(unsigned long),
2851                 .mode           = 0644,
2852                 .proc_handler   = hugetlb_sysctl_handler,
2853         },
2854 #ifdef CONFIG_NUMA
2855         {
2856                 .procname       = "nr_hugepages_mempolicy",
2857                 .data           = NULL,
2858                 .maxlen         = sizeof(unsigned long),
2859                 .mode           = 0644,
2860                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
2861         },
2862         {
2863                 .procname               = "numa_stat",
2864                 .data                   = &sysctl_vm_numa_stat,
2865                 .maxlen                 = sizeof(int),
2866                 .mode                   = 0644,
2867                 .proc_handler   = sysctl_vm_numa_stat_handler,
2868                 .extra1                 = SYSCTL_ZERO,
2869                 .extra2                 = SYSCTL_ONE,
2870         },
2871 #endif
2872          {
2873                 .procname       = "hugetlb_shm_group",
2874                 .data           = &sysctl_hugetlb_shm_group,
2875                 .maxlen         = sizeof(gid_t),
2876                 .mode           = 0644,
2877                 .proc_handler   = proc_dointvec,
2878          },
2879         {
2880                 .procname       = "nr_overcommit_hugepages",
2881                 .data           = NULL,
2882                 .maxlen         = sizeof(unsigned long),
2883                 .mode           = 0644,
2884                 .proc_handler   = hugetlb_overcommit_handler,
2885         },
2886 #endif
2887         {
2888                 .procname       = "lowmem_reserve_ratio",
2889                 .data           = &sysctl_lowmem_reserve_ratio,
2890                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
2891                 .mode           = 0644,
2892                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
2893         },
2894         {
2895                 .procname       = "drop_caches",
2896                 .data           = &sysctl_drop_caches,
2897                 .maxlen         = sizeof(int),
2898                 .mode           = 0200,
2899                 .proc_handler   = drop_caches_sysctl_handler,
2900                 .extra1         = SYSCTL_ONE,
2901                 .extra2         = &four,
2902         },
2903 #ifdef CONFIG_COMPACTION
2904         {
2905                 .procname       = "compact_memory",
2906                 .data           = NULL,
2907                 .maxlen         = sizeof(int),
2908                 .mode           = 0200,
2909                 .proc_handler   = sysctl_compaction_handler,
2910         },
2911         {
2912                 .procname       = "compaction_proactiveness",
2913                 .data           = &sysctl_compaction_proactiveness,
2914                 .maxlen         = sizeof(sysctl_compaction_proactiveness),
2915                 .mode           = 0644,
2916                 .proc_handler   = compaction_proactiveness_sysctl_handler,
2917                 .extra1         = SYSCTL_ZERO,
2918                 .extra2         = &one_hundred,
2919         },
2920         {
2921                 .procname       = "extfrag_threshold",
2922                 .data           = &sysctl_extfrag_threshold,
2923                 .maxlen         = sizeof(int),
2924                 .mode           = 0644,
2925                 .proc_handler   = proc_dointvec_minmax,
2926                 .extra1         = &min_extfrag_threshold,
2927                 .extra2         = &max_extfrag_threshold,
2928         },
2929         {
2930                 .procname       = "compact_unevictable_allowed",
2931                 .data           = &sysctl_compact_unevictable_allowed,
2932                 .maxlen         = sizeof(int),
2933                 .mode           = 0644,
2934                 .proc_handler   = proc_dointvec_minmax_warn_RT_change,
2935                 .extra1         = SYSCTL_ZERO,
2936                 .extra2         = SYSCTL_ONE,
2937         },
2938
2939 #endif /* CONFIG_COMPACTION */
2940         {
2941                 .procname       = "min_free_kbytes",
2942                 .data           = &min_free_kbytes,
2943                 .maxlen         = sizeof(min_free_kbytes),
2944                 .mode           = 0644,
2945                 .proc_handler   = min_free_kbytes_sysctl_handler,
2946                 .extra1         = SYSCTL_ZERO,
2947         },
2948         {
2949                 .procname       = "watermark_boost_factor",
2950                 .data           = &watermark_boost_factor,
2951                 .maxlen         = sizeof(watermark_boost_factor),
2952                 .mode           = 0644,
2953                 .proc_handler   = proc_dointvec_minmax,
2954                 .extra1         = SYSCTL_ZERO,
2955         },
2956         {
2957                 .procname       = "watermark_scale_factor",
2958                 .data           = &watermark_scale_factor,
2959                 .maxlen         = sizeof(watermark_scale_factor),
2960                 .mode           = 0644,
2961                 .proc_handler   = watermark_scale_factor_sysctl_handler,
2962                 .extra1         = SYSCTL_ONE,
2963                 .extra2         = &one_thousand,
2964         },
2965         {
2966                 .procname       = "percpu_pagelist_high_fraction",
2967                 .data           = &percpu_pagelist_high_fraction,
2968                 .maxlen         = sizeof(percpu_pagelist_high_fraction),
2969                 .mode           = 0644,
2970                 .proc_handler   = percpu_pagelist_high_fraction_sysctl_handler,
2971                 .extra1         = SYSCTL_ZERO,
2972         },
2973         {
2974                 .procname       = "page_lock_unfairness",
2975                 .data           = &sysctl_page_lock_unfairness,
2976                 .maxlen         = sizeof(sysctl_page_lock_unfairness),
2977                 .mode           = 0644,
2978                 .proc_handler   = proc_dointvec_minmax,
2979                 .extra1         = SYSCTL_ZERO,
2980         },
2981 #ifdef CONFIG_MMU
2982         {
2983                 .procname       = "max_map_count",
2984                 .data           = &sysctl_max_map_count,
2985                 .maxlen         = sizeof(sysctl_max_map_count),
2986                 .mode           = 0644,
2987                 .proc_handler   = proc_dointvec_minmax,
2988                 .extra1         = SYSCTL_ZERO,
2989         },
2990 #else
2991         {
2992                 .procname       = "nr_trim_pages",
2993                 .data           = &sysctl_nr_trim_pages,
2994                 .maxlen         = sizeof(sysctl_nr_trim_pages),
2995                 .mode           = 0644,
2996                 .proc_handler   = proc_dointvec_minmax,
2997                 .extra1         = SYSCTL_ZERO,
2998         },
2999 #endif
3000         {
3001                 .procname       = "laptop_mode",
3002                 .data           = &laptop_mode,
3003                 .maxlen         = sizeof(laptop_mode),
3004                 .mode           = 0644,
3005                 .proc_handler   = proc_dointvec_jiffies,
3006         },
3007         {
3008                 .procname       = "vfs_cache_pressure",
3009                 .data           = &sysctl_vfs_cache_pressure,
3010                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
3011                 .mode           = 0644,
3012                 .proc_handler   = proc_dointvec_minmax,
3013                 .extra1         = SYSCTL_ZERO,
3014         },
3015 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
3016     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
3017         {
3018                 .procname       = "legacy_va_layout",
3019                 .data           = &sysctl_legacy_va_layout,
3020                 .maxlen         = sizeof(sysctl_legacy_va_layout),
3021                 .mode           = 0644,
3022                 .proc_handler   = proc_dointvec_minmax,
3023                 .extra1         = SYSCTL_ZERO,
3024         },
3025 #endif
3026 #ifdef CONFIG_NUMA
3027         {
3028                 .procname       = "zone_reclaim_mode",
3029                 .data           = &node_reclaim_mode,
3030                 .maxlen         = sizeof(node_reclaim_mode),
3031                 .mode           = 0644,
3032                 .proc_handler   = proc_dointvec_minmax,
3033                 .extra1         = SYSCTL_ZERO,
3034         },
3035         {
3036                 .procname       = "min_unmapped_ratio",
3037                 .data           = &sysctl_min_unmapped_ratio,
3038                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
3039                 .mode           = 0644,
3040                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
3041                 .extra1         = SYSCTL_ZERO,
3042                 .extra2         = &one_hundred,
3043         },
3044         {
3045                 .procname       = "min_slab_ratio",
3046                 .data           = &sysctl_min_slab_ratio,
3047                 .maxlen         = sizeof(sysctl_min_slab_ratio),
3048                 .mode           = 0644,
3049                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
3050                 .extra1         = SYSCTL_ZERO,
3051                 .extra2         = &one_hundred,
3052         },
3053 #endif
3054 #ifdef CONFIG_SMP
3055         {
3056                 .procname       = "stat_interval",
3057                 .data           = &sysctl_stat_interval,
3058                 .maxlen         = sizeof(sysctl_stat_interval),
3059                 .mode           = 0644,
3060                 .proc_handler   = proc_dointvec_jiffies,
3061         },
3062         {
3063                 .procname       = "stat_refresh",
3064                 .data           = NULL,
3065                 .maxlen         = 0,
3066                 .mode           = 0600,
3067                 .proc_handler   = vmstat_refresh,
3068         },
3069 #endif
3070 #ifdef CONFIG_MMU
3071         {
3072                 .procname       = "mmap_min_addr",
3073                 .data           = &dac_mmap_min_addr,
3074                 .maxlen         = sizeof(unsigned long),
3075                 .mode           = 0644,
3076                 .proc_handler   = mmap_min_addr_handler,
3077         },
3078 #endif
3079 #ifdef CONFIG_NUMA
3080         {
3081                 .procname       = "numa_zonelist_order",
3082                 .data           = &numa_zonelist_order,
3083                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
3084                 .mode           = 0644,
3085                 .proc_handler   = numa_zonelist_order_handler,
3086         },
3087 #endif
3088 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
3089    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
3090         {
3091                 .procname       = "vdso_enabled",
3092 #ifdef CONFIG_X86_32
3093                 .data           = &vdso32_enabled,
3094                 .maxlen         = sizeof(vdso32_enabled),
3095 #else
3096                 .data           = &vdso_enabled,
3097                 .maxlen         = sizeof(vdso_enabled),
3098 #endif
3099                 .mode           = 0644,
3100                 .proc_handler   = proc_dointvec,
3101                 .extra1         = SYSCTL_ZERO,
3102         },
3103 #endif
3104 #ifdef CONFIG_HIGHMEM
3105         {
3106                 .procname       = "highmem_is_dirtyable",
3107                 .data           = &vm_highmem_is_dirtyable,
3108                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
3109                 .mode           = 0644,
3110                 .proc_handler   = proc_dointvec_minmax,
3111                 .extra1         = SYSCTL_ZERO,
3112                 .extra2         = SYSCTL_ONE,
3113         },
3114 #endif
3115 #ifdef CONFIG_MEMORY_FAILURE
3116         {
3117                 .procname       = "memory_failure_early_kill",
3118                 .data           = &sysctl_memory_failure_early_kill,
3119                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
3120                 .mode           = 0644,
3121                 .proc_handler   = proc_dointvec_minmax,
3122                 .extra1         = SYSCTL_ZERO,
3123                 .extra2         = SYSCTL_ONE,
3124         },
3125         {
3126                 .procname       = "memory_failure_recovery",
3127                 .data           = &sysctl_memory_failure_recovery,
3128                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
3129                 .mode           = 0644,
3130                 .proc_handler   = proc_dointvec_minmax,
3131                 .extra1         = SYSCTL_ZERO,
3132                 .extra2         = SYSCTL_ONE,
3133         },
3134 #endif
3135         {
3136                 .procname       = "user_reserve_kbytes",
3137                 .data           = &sysctl_user_reserve_kbytes,
3138                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
3139                 .mode           = 0644,
3140                 .proc_handler   = proc_doulongvec_minmax,
3141         },
3142         {
3143                 .procname       = "admin_reserve_kbytes",
3144                 .data           = &sysctl_admin_reserve_kbytes,
3145                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
3146                 .mode           = 0644,
3147                 .proc_handler   = proc_doulongvec_minmax,
3148         },
3149 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3150         {
3151                 .procname       = "mmap_rnd_bits",
3152                 .data           = &mmap_rnd_bits,
3153                 .maxlen         = sizeof(mmap_rnd_bits),
3154                 .mode           = 0600,
3155                 .proc_handler   = proc_dointvec_minmax,
3156                 .extra1         = (void *)&mmap_rnd_bits_min,
3157                 .extra2         = (void *)&mmap_rnd_bits_max,
3158         },
3159 #endif
3160 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3161         {
3162                 .procname       = "mmap_rnd_compat_bits",
3163                 .data           = &mmap_rnd_compat_bits,
3164                 .maxlen         = sizeof(mmap_rnd_compat_bits),
3165                 .mode           = 0600,
3166                 .proc_handler   = proc_dointvec_minmax,
3167                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
3168                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
3169         },
3170 #endif
3171 #ifdef CONFIG_USERFAULTFD
3172         {
3173                 .procname       = "unprivileged_userfaultfd",
3174                 .data           = &sysctl_unprivileged_userfaultfd,
3175                 .maxlen         = sizeof(sysctl_unprivileged_userfaultfd),
3176                 .mode           = 0644,
3177                 .proc_handler   = proc_dointvec_minmax,
3178                 .extra1         = SYSCTL_ZERO,
3179                 .extra2         = SYSCTL_ONE,
3180         },
3181 #endif
3182         { }
3183 };
3184
3185 static struct ctl_table fs_table[] = {
3186         {
3187                 .procname       = "inode-nr",
3188                 .data           = &inodes_stat,
3189                 .maxlen         = 2*sizeof(long),
3190                 .mode           = 0444,
3191                 .proc_handler   = proc_nr_inodes,
3192         },
3193         {
3194                 .procname       = "inode-state",
3195                 .data           = &inodes_stat,
3196                 .maxlen         = 7*sizeof(long),
3197                 .mode           = 0444,
3198                 .proc_handler   = proc_nr_inodes,
3199         },
3200         {
3201                 .procname       = "file-nr",
3202                 .data           = &files_stat,
3203                 .maxlen         = sizeof(files_stat),
3204                 .mode           = 0444,
3205                 .proc_handler   = proc_nr_files,
3206         },
3207         {
3208                 .procname       = "file-max",
3209                 .data           = &files_stat.max_files,
3210                 .maxlen         = sizeof(files_stat.max_files),
3211                 .mode           = 0644,
3212                 .proc_handler   = proc_doulongvec_minmax,
3213                 .extra1         = &zero_ul,
3214                 .extra2         = &long_max,
3215         },
3216         {
3217                 .procname       = "nr_open",
3218                 .data           = &sysctl_nr_open,
3219                 .maxlen         = sizeof(unsigned int),
3220                 .mode           = 0644,
3221                 .proc_handler   = proc_dointvec_minmax,
3222                 .extra1         = &sysctl_nr_open_min,
3223                 .extra2         = &sysctl_nr_open_max,
3224         },
3225         {
3226                 .procname       = "dentry-state",
3227                 .data           = &dentry_stat,
3228                 .maxlen         = 6*sizeof(long),
3229                 .mode           = 0444,
3230                 .proc_handler   = proc_nr_dentry,
3231         },
3232         {
3233                 .procname       = "overflowuid",
3234                 .data           = &fs_overflowuid,
3235                 .maxlen         = sizeof(int),
3236                 .mode           = 0644,
3237                 .proc_handler   = proc_dointvec_minmax,
3238                 .extra1         = &minolduid,
3239                 .extra2         = &maxolduid,
3240         },
3241         {
3242                 .procname       = "overflowgid",
3243                 .data           = &fs_overflowgid,
3244                 .maxlen         = sizeof(int),
3245                 .mode           = 0644,
3246                 .proc_handler   = proc_dointvec_minmax,
3247                 .extra1         = &minolduid,
3248                 .extra2         = &maxolduid,
3249         },
3250 #ifdef CONFIG_FILE_LOCKING
3251         {
3252                 .procname       = "leases-enable",
3253                 .data           = &leases_enable,
3254                 .maxlen         = sizeof(int),
3255                 .mode           = 0644,
3256                 .proc_handler   = proc_dointvec,
3257         },
3258 #endif
3259 #ifdef CONFIG_DNOTIFY
3260         {
3261                 .procname       = "dir-notify-enable",
3262                 .data           = &dir_notify_enable,
3263                 .maxlen         = sizeof(int),
3264                 .mode           = 0644,
3265                 .proc_handler   = proc_dointvec,
3266         },
3267 #endif
3268 #ifdef CONFIG_MMU
3269 #ifdef CONFIG_FILE_LOCKING
3270         {
3271                 .procname       = "lease-break-time",
3272                 .data           = &lease_break_time,
3273                 .maxlen         = sizeof(int),
3274                 .mode           = 0644,
3275                 .proc_handler   = proc_dointvec,
3276         },
3277 #endif
3278 #ifdef CONFIG_AIO
3279         {
3280                 .procname       = "aio-nr",
3281                 .data           = &aio_nr,
3282                 .maxlen         = sizeof(aio_nr),
3283                 .mode           = 0444,
3284                 .proc_handler   = proc_doulongvec_minmax,
3285         },
3286         {
3287                 .procname       = "aio-max-nr",
3288                 .data           = &aio_max_nr,
3289                 .maxlen         = sizeof(aio_max_nr),
3290                 .mode           = 0644,
3291                 .proc_handler   = proc_doulongvec_minmax,
3292         },
3293 #endif /* CONFIG_AIO */
3294 #ifdef CONFIG_INOTIFY_USER
3295         {
3296                 .procname       = "inotify",
3297                 .mode           = 0555,
3298                 .child          = inotify_table,
3299         },
3300 #endif
3301 #ifdef CONFIG_FANOTIFY
3302         {
3303                 .procname       = "fanotify",
3304                 .mode           = 0555,
3305                 .child          = fanotify_table,
3306         },
3307 #endif
3308 #ifdef CONFIG_EPOLL
3309         {
3310                 .procname       = "epoll",
3311                 .mode           = 0555,
3312                 .child          = epoll_table,
3313         },
3314 #endif
3315 #endif
3316         {
3317                 .procname       = "protected_symlinks",
3318                 .data           = &sysctl_protected_symlinks,
3319                 .maxlen         = sizeof(int),
3320                 .mode           = 0600,
3321                 .proc_handler   = proc_dointvec_minmax,
3322                 .extra1         = SYSCTL_ZERO,
3323                 .extra2         = SYSCTL_ONE,
3324         },
3325         {
3326                 .procname       = "protected_hardlinks",
3327                 .data           = &sysctl_protected_hardlinks,
3328                 .maxlen         = sizeof(int),
3329                 .mode           = 0600,
3330                 .proc_handler   = proc_dointvec_minmax,
3331                 .extra1         = SYSCTL_ZERO,
3332                 .extra2         = SYSCTL_ONE,
3333         },
3334         {
3335                 .procname       = "protected_fifos",
3336                 .data           = &sysctl_protected_fifos,
3337                 .maxlen         = sizeof(int),
3338                 .mode           = 0600,
3339                 .proc_handler   = proc_dointvec_minmax,
3340                 .extra1         = SYSCTL_ZERO,
3341                 .extra2         = &two,
3342         },
3343         {
3344                 .procname       = "protected_regular",
3345                 .data           = &sysctl_protected_regular,
3346                 .maxlen         = sizeof(int),
3347                 .mode           = 0600,
3348                 .proc_handler   = proc_dointvec_minmax,
3349                 .extra1         = SYSCTL_ZERO,
3350                 .extra2         = &two,
3351         },
3352         {
3353                 .procname       = "suid_dumpable",
3354                 .data           = &suid_dumpable,
3355                 .maxlen         = sizeof(int),
3356                 .mode           = 0644,
3357                 .proc_handler   = proc_dointvec_minmax_coredump,
3358                 .extra1         = SYSCTL_ZERO,
3359                 .extra2         = &two,
3360         },
3361 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3362         {
3363                 .procname       = "binfmt_misc",
3364                 .mode           = 0555,
3365                 .child          = sysctl_mount_point,
3366         },
3367 #endif
3368         {
3369                 .procname       = "pipe-max-size",
3370                 .data           = &pipe_max_size,
3371                 .maxlen         = sizeof(pipe_max_size),
3372                 .mode           = 0644,
3373                 .proc_handler   = proc_dopipe_max_size,
3374         },
3375         {
3376                 .procname       = "pipe-user-pages-hard",
3377                 .data           = &pipe_user_pages_hard,
3378                 .maxlen         = sizeof(pipe_user_pages_hard),
3379                 .mode           = 0644,
3380                 .proc_handler   = proc_doulongvec_minmax,
3381         },
3382         {
3383                 .procname       = "pipe-user-pages-soft",
3384                 .data           = &pipe_user_pages_soft,
3385                 .maxlen         = sizeof(pipe_user_pages_soft),
3386                 .mode           = 0644,
3387                 .proc_handler   = proc_doulongvec_minmax,
3388         },
3389         {
3390                 .procname       = "mount-max",
3391                 .data           = &sysctl_mount_max,
3392                 .maxlen         = sizeof(unsigned int),
3393                 .mode           = 0644,
3394                 .proc_handler   = proc_dointvec_minmax,
3395                 .extra1         = SYSCTL_ONE,
3396         },
3397         { }
3398 };
3399
3400 static struct ctl_table debug_table[] = {
3401 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3402         {
3403                 .procname       = "exception-trace",
3404                 .data           = &show_unhandled_signals,
3405                 .maxlen         = sizeof(int),
3406                 .mode           = 0644,
3407                 .proc_handler   = proc_dointvec
3408         },
3409 #endif
3410 #if defined(CONFIG_OPTPROBES)
3411         {
3412                 .procname       = "kprobes-optimization",
3413                 .data           = &sysctl_kprobes_optimization,
3414                 .maxlen         = sizeof(int),
3415                 .mode           = 0644,
3416                 .proc_handler   = proc_kprobes_optimization_handler,
3417                 .extra1         = SYSCTL_ZERO,
3418                 .extra2         = SYSCTL_ONE,
3419         },
3420 #endif
3421         { }
3422 };
3423
3424 static struct ctl_table dev_table[] = {
3425         { }
3426 };
3427
3428 static struct ctl_table sysctl_base_table[] = {
3429         {
3430                 .procname       = "kernel",
3431                 .mode           = 0555,
3432                 .child          = kern_table,
3433         },
3434         {
3435                 .procname       = "vm",
3436                 .mode           = 0555,
3437                 .child          = vm_table,
3438         },
3439         {
3440                 .procname       = "fs",
3441                 .mode           = 0555,
3442                 .child          = fs_table,
3443         },
3444         {
3445                 .procname       = "debug",
3446                 .mode           = 0555,
3447                 .child          = debug_table,
3448         },
3449         {
3450                 .procname       = "dev",
3451                 .mode           = 0555,
3452                 .child          = dev_table,
3453         },
3454         { }
3455 };
3456
3457 int __init sysctl_init(void)
3458 {
3459         struct ctl_table_header *hdr;
3460
3461         hdr = register_sysctl_table(sysctl_base_table);
3462         kmemleak_not_leak(hdr);
3463         return 0;
3464 }
3465 #endif /* CONFIG_SYSCTL */
3466 /*
3467  * No sense putting this after each symbol definition, twice,
3468  * exception granted :-)
3469  */
3470 EXPORT_SYMBOL(proc_dobool);
3471 EXPORT_SYMBOL(proc_dointvec);
3472 EXPORT_SYMBOL(proc_douintvec);
3473 EXPORT_SYMBOL(proc_dointvec_jiffies);
3474 EXPORT_SYMBOL(proc_dointvec_minmax);
3475 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3476 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3477 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3478 EXPORT_SYMBOL(proc_dostring);
3479 EXPORT_SYMBOL(proc_doulongvec_minmax);
3480 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3481 EXPORT_SYMBOL(proc_do_large_bitmap);