kernel/sysctl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sysctl.c: General linux system control interface
   4  *
   5  * Begun 24 March 1995, Stephen Tweedie
   6  * Added /proc support, Dec 1995
   7  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   8  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   9  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
  10  * Dynamic registration fixes, Stephen Tweedie.
  11  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  12  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  13  *  Horn.
  14  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  15  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  16  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  17  *  Wendling.
  18  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  19  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/aio.h>
  24 #include <linux/mm.h>
  25 #include <linux/swap.h>
  26 #include <linux/slab.h>
  27 #include <linux/sysctl.h>
  28 #include <linux/bitmap.h>
  29 #include <linux/signal.h>
  30 #include <linux/printk.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/security.h>
  33 #include <linux/ctype.h>
  34 #include <linux/kmemleak.h>
  35 #include <linux/fs.h>
  36 #include <linux/init.h>
  37 #include <linux/kernel.h>
  38 #include <linux/kobject.h>
  39 #include <linux/net.h>
  40 #include <linux/sysrq.h>
  41 #include <linux/highuid.h>
  42 #include <linux/writeback.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/compaction.h>
  45 #include <linux/hugetlb.h>
  46 #include <linux/initrd.h>
  47 #include <linux/key.h>
  48 #include <linux/times.h>
  49 #include <linux/limits.h>
  50 #include <linux/dcache.h>
  51 #include <linux/dnotify.h>
  52 #include <linux/syscalls.h>
  53 #include <linux/vmstat.h>
  54 #include <linux/nfs_fs.h>
  55 #include <linux/acpi.h>
  56 #include <linux/reboot.h>
  57 #include <linux/ftrace.h>
  58 #include <linux/perf_event.h>
  59 #include <linux/kprobes.h>
  60 #include <linux/pipe_fs_i.h>
  61 #include <linux/oom.h>
  62 #include <linux/kmod.h>
  63 #include <linux/capability.h>
  64 #include <linux/binfmts.h>
  65 #include <linux/sched/sysctl.h>
  66 #include <linux/sched/coredump.h>
  67 #include <linux/kexec.h>
  68 #include <linux/bpf.h>
  69 #include <linux/mount.h>
  70 #include <linux/userfaultfd_k.h>
  71
  72 #include "../lib/kstrtox.h"
  73
  74 #include <linux/uaccess.h>
  75 #include <asm/processor.h>
  76
  77 #ifdef CONFIG_X86
  78 #include <asm/nmi.h>
  79 #include <asm/stacktrace.h>
  80 #include <asm/io.h>
  81 #endif
  82 #ifdef CONFIG_SPARC
  83 #include <asm/setup.h>
  84 #endif
  85 #ifdef CONFIG_BSD_PROCESS_ACCT
  86 #include <linux/acct.h>
  87 #endif
  88 #ifdef CONFIG_RT_MUTEXES
  89 #include <linux/rtmutex.h>
  90 #endif
  91 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  92 #include <linux/lockdep.h>
  93 #endif
  94 #ifdef CONFIG_CHR_DEV_SG
  95 #include <scsi/sg.h>
  96 #endif
  97 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
  98 #include <linux/stackleak.h>
  99 #endif
 100 #ifdef CONFIG_LOCKUP_DETECTOR
 101 #include <linux/nmi.h>
 102 #endif
 103
 104 #if defined(CONFIG_SYSCTL)
 105
 106 /* External variables not in a header file. */
 107 extern int suid_dumpable;
 108 #ifdef CONFIG_COREDUMP
 109 extern int core_uses_pid;
 110 extern char core_pattern[];
 111 extern unsigned int core_pipe_limit;
 112 #endif
 113 extern int pid_max;
 114 extern int pid_max_min, pid_max_max;
 115 extern int percpu_pagelist_fraction;
 116 extern int latencytop_enabled;
 117 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
 118 #ifndef CONFIG_MMU
 119 extern int sysctl_nr_trim_pages;
 120 #endif
 121
 122 /* Constants used for minimum and  maximum */
 123 #ifdef CONFIG_LOCKUP_DETECTOR
 124 static int sixty = 60;
 125 #endif
 126
 127 static int __maybe_unused neg_one = -1;
 128 static int __maybe_unused two = 2;
 129 static int __maybe_unused four = 4;
 130 static unsigned long zero_ul;
 131 static unsigned long one_ul = 1;
 132 static unsigned long long_max = LONG_MAX;
 133 static int one_hundred = 100;
 134 static int one_thousand = 1000;
 135 #ifdef CONFIG_PRINTK
 136 static int ten_thousand = 10000;
 137 #endif
 138 #ifdef CONFIG_PERF_EVENTS
 139 static int six_hundred_forty_kb = 640 * 1024;
 140 #endif
 141
 142 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 143 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 144
 145 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 146 static int maxolduid = 65535;
 147 static int minolduid;
 148
 149 static int ngroups_max = NGROUPS_MAX;
 150 static const int cap_last_cap = CAP_LAST_CAP;
 151
 152 /*
 153  * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
 154  * and hung_task_check_interval_secs
 155  */
 156 #ifdef CONFIG_DETECT_HUNG_TASK
 157 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 158 #endif
 159
 160 #ifdef CONFIG_INOTIFY_USER
 161 #include <linux/inotify.h>
 162 #endif
 163 #ifdef CONFIG_SPARC
 164 #endif
 165
 166 #ifdef CONFIG_PARISC
 167 extern int pwrsw_enabled;
 168 #endif
 169
 170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 171 extern int unaligned_enabled;
 172 #endif
 173
 174 #ifdef CONFIG_IA64
 175 extern int unaligned_dump_stack;
 176 #endif
 177
 178 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 179 extern int no_unaligned_warning;
 180 #endif
 181
 182 #ifdef CONFIG_PROC_SYSCTL
 183
 184 /**
 185  * enum sysctl_writes_mode - supported sysctl write modes
 186  *
 187  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 188  *      to be written, and multiple writes on the same sysctl file descriptor
 189  *      will rewrite the sysctl value, regardless of file position. No warning
 190  *      is issued when the initial position is not 0.
 191  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 192  *      not 0.
 193  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 194  *      file position 0 and the value must be fully contained in the buffer
 195  *      sent to the write syscall. If dealing with strings respect the file
 196  *      position, but restrict this to the max length of the buffer, anything
 197  *      passed the max length will be ignored. Multiple writes will append
 198  *      to the buffer.
 199  *
 200  * These write modes control how current file position affects the behavior of
 201  * updating sysctl values through the proc interface on each write.
 202  */
 203 enum sysctl_writes_mode {
 204         SYSCTL_WRITES_LEGACY            = -1,
 205         SYSCTL_WRITES_WARN              = 0,
 206         SYSCTL_WRITES_STRICT            = 1,
 207 };
 208
 209 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 210
 211 static int proc_do_cad_pid(struct ctl_table *table, int write,
 212                   void __user *buffer, size_t *lenp, loff_t *ppos);
 213 static int proc_taint(struct ctl_table *table, int write,
 214                                void __user *buffer, size_t *lenp, loff_t *ppos);
 215 #endif
 216
 217 #ifdef CONFIG_PRINTK
 218 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 219                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 220 #endif
 221
 222 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 223                 void __user *buffer, size_t *lenp, loff_t *ppos);
 224 #ifdef CONFIG_COREDUMP
 225 static int proc_dostring_coredump(struct ctl_table *table, int write,
 226                 void __user *buffer, size_t *lenp, loff_t *ppos);
 227 #endif
 228 static int proc_dopipe_max_size(struct ctl_table *table, int write,
 229                 void __user *buffer, size_t *lenp, loff_t *ppos);
 230
 231 #ifdef CONFIG_MAGIC_SYSRQ
 232 /* Note: sysrq code uses its own private copy */
 233 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 234
 235 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 236                                 void __user *buffer, size_t *lenp,
 237                                 loff_t *ppos)
 238 {
 239         int error;
 240
 241         error = proc_dointvec(table, write, buffer, lenp, ppos);
 242         if (error)
 243                 return error;
 244
 245         if (write)
 246                 sysrq_toggle_support(__sysrq_enabled);
 247
 248         return 0;
 249 }
 250
 251 #endif
 252
 253 static struct ctl_table kern_table[];
 254 static struct ctl_table vm_table[];
 255 static struct ctl_table fs_table[];
 256 static struct ctl_table debug_table[];
 257 static struct ctl_table dev_table[];
 258 extern struct ctl_table random_table[];
 259 #ifdef CONFIG_EPOLL
 260 extern struct ctl_table epoll_table[];
 261 #endif
 262
 263 #ifdef CONFIG_FW_LOADER_USER_HELPER
 264 extern struct ctl_table firmware_config_table[];
 265 #endif
 266
 267 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
 268     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
 269 int sysctl_legacy_va_layout;
 270 #endif
 271
 272 /* The default sysctl tables: */
 273
 274 static struct ctl_table sysctl_base_table[] = {
 275         {
 276                 .procname       = "kernel",
 277                 .mode           = 0555,
 278                 .child          = kern_table,
 279         },
 280         {
 281                 .procname       = "vm",
 282                 .mode           = 0555,
 283                 .child          = vm_table,
 284         },
 285         {
 286                 .procname       = "fs",
 287                 .mode           = 0555,
 288                 .child          = fs_table,
 289         },
 290         {
 291                 .procname       = "debug",
 292                 .mode           = 0555,
 293                 .child          = debug_table,
 294         },
 295         {
 296                 .procname       = "dev",
 297                 .mode           = 0555,
 298                 .child          = dev_table,
 299         },
 300         { }
 301 };
 302
 303 #ifdef CONFIG_SCHED_DEBUG
 304 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 305 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 306 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 307 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 308 #ifdef CONFIG_SMP
 309 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 310 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 311 #endif /* CONFIG_SMP */
 312 #endif /* CONFIG_SCHED_DEBUG */
 313
 314 #ifdef CONFIG_COMPACTION
 315 static int min_extfrag_threshold;
 316 static int max_extfrag_threshold = 1000;
 317 #endif
 318
 319 static struct ctl_table kern_table[] = {
 320         {
 321                 .procname       = "sched_child_runs_first",
 322                 .data           = &sysctl_sched_child_runs_first,
 323                 .maxlen         = sizeof(unsigned int),
 324                 .mode           = 0644,
 325                 .proc_handler   = proc_dointvec,
 326         },
 327 #ifdef CONFIG_SCHED_DEBUG
 328         {
 329                 .procname       = "sched_min_granularity_ns",
 330                 .data           = &sysctl_sched_min_granularity,
 331                 .maxlen         = sizeof(unsigned int),
 332                 .mode           = 0644,
 333                 .proc_handler   = sched_proc_update_handler,
 334                 .extra1         = &min_sched_granularity_ns,
 335                 .extra2         = &max_sched_granularity_ns,
 336         },
 337         {
 338                 .procname       = "sched_latency_ns",
 339                 .data           = &sysctl_sched_latency,
 340                 .maxlen         = sizeof(unsigned int),
 341                 .mode           = 0644,
 342                 .proc_handler   = sched_proc_update_handler,
 343                 .extra1         = &min_sched_granularity_ns,
 344                 .extra2         = &max_sched_granularity_ns,
 345         },
 346         {
 347                 .procname       = "sched_wakeup_granularity_ns",
 348                 .data           = &sysctl_sched_wakeup_granularity,
 349                 .maxlen         = sizeof(unsigned int),
 350                 .mode           = 0644,
 351                 .proc_handler   = sched_proc_update_handler,
 352                 .extra1         = &min_wakeup_granularity_ns,
 353                 .extra2         = &max_wakeup_granularity_ns,
 354         },
 355 #ifdef CONFIG_SMP
 356         {
 357                 .procname       = "sched_tunable_scaling",
 358                 .data           = &sysctl_sched_tunable_scaling,
 359                 .maxlen         = sizeof(enum sched_tunable_scaling),
 360                 .mode           = 0644,
 361                 .proc_handler   = sched_proc_update_handler,
 362                 .extra1         = &min_sched_tunable_scaling,
 363                 .extra2         = &max_sched_tunable_scaling,
 364         },
 365         {
 366                 .procname       = "sched_migration_cost_ns",
 367                 .data           = &sysctl_sched_migration_cost,
 368                 .maxlen         = sizeof(unsigned int),
 369                 .mode           = 0644,
 370                 .proc_handler   = proc_dointvec,
 371         },
 372         {
 373                 .procname       = "sched_nr_migrate",
 374                 .data           = &sysctl_sched_nr_migrate,
 375                 .maxlen         = sizeof(unsigned int),
 376                 .mode           = 0644,
 377                 .proc_handler   = proc_dointvec,
 378         },
 379 #ifdef CONFIG_SCHEDSTATS
 380         {
 381                 .procname       = "sched_schedstats",
 382                 .data           = NULL,
 383                 .maxlen         = sizeof(unsigned int),
 384                 .mode           = 0644,
 385                 .proc_handler   = sysctl_schedstats,
 386                 .extra1         = SYSCTL_ZERO,
 387                 .extra2         = SYSCTL_ONE,
 388         },
 389 #endif /* CONFIG_SCHEDSTATS */
 390 #endif /* CONFIG_SMP */
 391 #ifdef CONFIG_NUMA_BALANCING
 392         {
 393                 .procname       = "numa_balancing_scan_delay_ms",
 394                 .data           = &sysctl_numa_balancing_scan_delay,
 395                 .maxlen         = sizeof(unsigned int),
 396                 .mode           = 0644,
 397                 .proc_handler   = proc_dointvec,
 398         },
 399         {
 400                 .procname       = "numa_balancing_scan_period_min_ms",
 401                 .data           = &sysctl_numa_balancing_scan_period_min,
 402                 .maxlen         = sizeof(unsigned int),
 403                 .mode           = 0644,
 404                 .proc_handler   = proc_dointvec,
 405         },
 406         {
 407                 .procname       = "numa_balancing_scan_period_max_ms",
 408                 .data           = &sysctl_numa_balancing_scan_period_max,
 409                 .maxlen         = sizeof(unsigned int),
 410                 .mode           = 0644,
 411                 .proc_handler   = proc_dointvec,
 412         },
 413         {
 414                 .procname       = "numa_balancing_scan_size_mb",
 415                 .data           = &sysctl_numa_balancing_scan_size,
 416                 .maxlen         = sizeof(unsigned int),
 417                 .mode           = 0644,
 418                 .proc_handler   = proc_dointvec_minmax,
 419                 .extra1         = SYSCTL_ONE,
 420         },
 421         {
 422                 .procname       = "numa_balancing",
 423                 .data           = NULL, /* filled in by handler */
 424                 .maxlen         = sizeof(unsigned int),
 425                 .mode           = 0644,
 426                 .proc_handler   = sysctl_numa_balancing,
 427                 .extra1         = SYSCTL_ZERO,
 428                 .extra2         = SYSCTL_ONE,
 429         },
 430 #endif /* CONFIG_NUMA_BALANCING */
 431 #endif /* CONFIG_SCHED_DEBUG */
 432         {
 433                 .procname       = "sched_rt_period_us",
 434                 .data           = &sysctl_sched_rt_period,
 435                 .maxlen         = sizeof(unsigned int),
 436                 .mode           = 0644,
 437                 .proc_handler   = sched_rt_handler,
 438         },
 439         {
 440                 .procname       = "sched_rt_runtime_us",
 441                 .data           = &sysctl_sched_rt_runtime,
 442                 .maxlen         = sizeof(int),
 443                 .mode           = 0644,
 444                 .proc_handler   = sched_rt_handler,
 445         },
 446         {
 447                 .procname       = "sched_rr_timeslice_ms",
 448                 .data           = &sysctl_sched_rr_timeslice,
 449                 .maxlen         = sizeof(int),
 450                 .mode           = 0644,
 451                 .proc_handler   = sched_rr_handler,
 452         },
 453 #ifdef CONFIG_UCLAMP_TASK
 454         {
 455                 .procname       = "sched_util_clamp_min",
 456                 .data           = &sysctl_sched_uclamp_util_min,
 457                 .maxlen         = sizeof(unsigned int),
 458                 .mode           = 0644,
 459                 .proc_handler   = sysctl_sched_uclamp_handler,
 460         },
 461         {
 462                 .procname       = "sched_util_clamp_max",
 463                 .data           = &sysctl_sched_uclamp_util_max,
 464                 .maxlen         = sizeof(unsigned int),
 465                 .mode           = 0644,
 466                 .proc_handler   = sysctl_sched_uclamp_handler,
 467         },
 468 #endif
 469 #ifdef CONFIG_SCHED_AUTOGROUP
 470         {
 471                 .procname       = "sched_autogroup_enabled",
 472                 .data           = &sysctl_sched_autogroup_enabled,
 473                 .maxlen         = sizeof(unsigned int),
 474                 .mode           = 0644,
 475                 .proc_handler   = proc_dointvec_minmax,
 476                 .extra1         = SYSCTL_ZERO,
 477                 .extra2         = SYSCTL_ONE,
 478         },
 479 #endif
 480 #ifdef CONFIG_CFS_BANDWIDTH
 481         {
 482                 .procname       = "sched_cfs_bandwidth_slice_us",
 483                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 484                 .maxlen         = sizeof(unsigned int),
 485                 .mode           = 0644,
 486                 .proc_handler   = proc_dointvec_minmax,
 487                 .extra1         = SYSCTL_ONE,
 488         },
 489 #endif
 490 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
 491         {
 492                 .procname       = "sched_energy_aware",
 493                 .data           = &sysctl_sched_energy_aware,
 494                 .maxlen         = sizeof(unsigned int),
 495                 .mode           = 0644,
 496                 .proc_handler   = sched_energy_aware_handler,
 497                 .extra1         = SYSCTL_ZERO,
 498                 .extra2         = SYSCTL_ONE,
 499         },
 500 #endif
 501 #ifdef CONFIG_PROVE_LOCKING
 502         {
 503                 .procname       = "prove_locking",
 504                 .data           = &prove_locking,
 505                 .maxlen         = sizeof(int),
 506                 .mode           = 0644,
 507                 .proc_handler   = proc_dointvec,
 508         },
 509 #endif
 510 #ifdef CONFIG_LOCK_STAT
 511         {
 512                 .procname       = "lock_stat",
 513                 .data           = &lock_stat,
 514                 .maxlen         = sizeof(int),
 515                 .mode           = 0644,
 516                 .proc_handler   = proc_dointvec,
 517         },
 518 #endif
 519         {
 520                 .procname       = "panic",
 521                 .data           = &panic_timeout,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = proc_dointvec,
 525         },
 526 #ifdef CONFIG_COREDUMP
 527         {
 528                 .procname       = "core_uses_pid",
 529                 .data           = &core_uses_pid,
 530                 .maxlen         = sizeof(int),
 531                 .mode           = 0644,
 532                 .proc_handler   = proc_dointvec,
 533         },
 534         {
 535                 .procname       = "core_pattern",
 536                 .data           = core_pattern,
 537                 .maxlen         = CORENAME_MAX_SIZE,
 538                 .mode           = 0644,
 539                 .proc_handler   = proc_dostring_coredump,
 540         },
 541         {
 542                 .procname       = "core_pipe_limit",
 543                 .data           = &core_pipe_limit,
 544                 .maxlen         = sizeof(unsigned int),
 545                 .mode           = 0644,
 546                 .proc_handler   = proc_dointvec,
 547         },
 548 #endif
 549 #ifdef CONFIG_PROC_SYSCTL
 550         {
 551                 .procname       = "tainted",
 552                 .maxlen         = sizeof(long),
 553                 .mode           = 0644,
 554                 .proc_handler   = proc_taint,
 555         },
 556         {
 557                 .procname       = "sysctl_writes_strict",
 558                 .data           = &sysctl_writes_strict,
 559                 .maxlen         = sizeof(int),
 560                 .mode           = 0644,
 561                 .proc_handler   = proc_dointvec_minmax,
 562                 .extra1         = &neg_one,
 563                 .extra2         = SYSCTL_ONE,
 564         },
 565 #endif
 566 #ifdef CONFIG_LATENCYTOP
 567         {
 568                 .procname       = "latencytop",
 569                 .data           = &latencytop_enabled,
 570                 .maxlen         = sizeof(int),
 571                 .mode           = 0644,
 572                 .proc_handler   = sysctl_latencytop,
 573         },
 574 #endif
 575 #ifdef CONFIG_BLK_DEV_INITRD
 576         {
 577                 .procname       = "real-root-dev",
 578                 .data           = &real_root_dev,
 579                 .maxlen         = sizeof(int),
 580                 .mode           = 0644,
 581                 .proc_handler   = proc_dointvec,
 582         },
 583 #endif
 584         {
 585                 .procname       = "print-fatal-signals",
 586                 .data           = &print_fatal_signals,
 587                 .maxlen         = sizeof(int),
 588                 .mode           = 0644,
 589                 .proc_handler   = proc_dointvec,
 590         },
 591 #ifdef CONFIG_SPARC
 592         {
 593                 .procname       = "reboot-cmd",
 594                 .data           = reboot_command,
 595                 .maxlen         = 256,
 596                 .mode           = 0644,
 597                 .proc_handler   = proc_dostring,
 598         },
 599         {
 600                 .procname       = "stop-a",
 601                 .data           = &stop_a_enabled,
 602                 .maxlen         = sizeof (int),
 603                 .mode           = 0644,
 604                 .proc_handler   = proc_dointvec,
 605         },
 606         {
 607                 .procname       = "scons-poweroff",
 608                 .data           = &scons_pwroff,
 609                 .maxlen         = sizeof (int),
 610                 .mode           = 0644,
 611                 .proc_handler   = proc_dointvec,
 612         },
 613 #endif
 614 #ifdef CONFIG_SPARC64
 615         {
 616                 .procname       = "tsb-ratio",
 617                 .data           = &sysctl_tsb_ratio,
 618                 .maxlen         = sizeof (int),
 619                 .mode           = 0644,
 620                 .proc_handler   = proc_dointvec,
 621         },
 622 #endif
 623 #ifdef CONFIG_PARISC
 624         {
 625                 .procname       = "soft-power",
 626                 .data           = &pwrsw_enabled,
 627                 .maxlen         = sizeof (int),
 628                 .mode           = 0644,
 629                 .proc_handler   = proc_dointvec,
 630         },
 631 #endif
 632 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 633         {
 634                 .procname       = "unaligned-trap",
 635                 .data           = &unaligned_enabled,
 636                 .maxlen         = sizeof (int),
 637                 .mode           = 0644,
 638                 .proc_handler   = proc_dointvec,
 639         },
 640 #endif
 641         {
 642                 .procname       = "ctrl-alt-del",
 643                 .data           = &C_A_D,
 644                 .maxlen         = sizeof(int),
 645                 .mode           = 0644,
 646                 .proc_handler   = proc_dointvec,
 647         },
 648 #ifdef CONFIG_FUNCTION_TRACER
 649         {
 650                 .procname       = "ftrace_enabled",
 651                 .data           = &ftrace_enabled,
 652                 .maxlen         = sizeof(int),
 653                 .mode           = 0644,
 654                 .proc_handler   = ftrace_enable_sysctl,
 655         },
 656 #endif
 657 #ifdef CONFIG_STACK_TRACER
 658         {
 659                 .procname       = "stack_tracer_enabled",
 660                 .data           = &stack_tracer_enabled,
 661                 .maxlen         = sizeof(int),
 662                 .mode           = 0644,
 663                 .proc_handler   = stack_trace_sysctl,
 664         },
 665 #endif
 666 #ifdef CONFIG_TRACING
 667         {
 668                 .procname       = "ftrace_dump_on_oops",
 669                 .data           = &ftrace_dump_on_oops,
 670                 .maxlen         = sizeof(int),
 671                 .mode           = 0644,
 672                 .proc_handler   = proc_dointvec,
 673         },
 674         {
 675                 .procname       = "traceoff_on_warning",
 676                 .data           = &__disable_trace_on_warning,
 677                 .maxlen         = sizeof(__disable_trace_on_warning),
 678                 .mode           = 0644,
 679                 .proc_handler   = proc_dointvec,
 680         },
 681         {
 682                 .procname       = "tracepoint_printk",
 683                 .data           = &tracepoint_printk,
 684                 .maxlen         = sizeof(tracepoint_printk),
 685                 .mode           = 0644,
 686                 .proc_handler   = tracepoint_printk_sysctl,
 687         },
 688 #endif
 689 #ifdef CONFIG_KEXEC_CORE
 690         {
 691                 .procname       = "kexec_load_disabled",
 692                 .data           = &kexec_load_disabled,
 693                 .maxlen         = sizeof(int),
 694                 .mode           = 0644,
 695                 /* only handle a transition from default "0" to "1" */
 696                 .proc_handler   = proc_dointvec_minmax,
 697                 .extra1         = SYSCTL_ONE,
 698                 .extra2         = SYSCTL_ONE,
 699         },
 700 #endif
 701 #ifdef CONFIG_MODULES
 702         {
 703                 .procname       = "modprobe",
 704                 .data           = &modprobe_path,
 705                 .maxlen         = KMOD_PATH_LEN,
 706                 .mode           = 0644,
 707                 .proc_handler   = proc_dostring,
 708         },
 709         {
 710                 .procname       = "modules_disabled",
 711                 .data           = &modules_disabled,
 712                 .maxlen         = sizeof(int),
 713                 .mode           = 0644,
 714                 /* only handle a transition from default "0" to "1" */
 715                 .proc_handler   = proc_dointvec_minmax,
 716                 .extra1         = SYSCTL_ONE,
 717                 .extra2         = SYSCTL_ONE,
 718         },
 719 #endif
 720 #ifdef CONFIG_UEVENT_HELPER
 721         {
 722                 .procname       = "hotplug",
 723                 .data           = &uevent_helper,
 724                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 725                 .mode           = 0644,
 726                 .proc_handler   = proc_dostring,
 727         },
 728 #endif
 729 #ifdef CONFIG_CHR_DEV_SG
 730         {
 731                 .procname       = "sg-big-buff",
 732                 .data           = &sg_big_buff,
 733                 .maxlen         = sizeof (int),
 734                 .mode           = 0444,
 735                 .proc_handler   = proc_dointvec,
 736         },
 737 #endif
 738 #ifdef CONFIG_BSD_PROCESS_ACCT
 739         {
 740                 .procname       = "acct",
 741                 .data           = &acct_parm,
 742                 .maxlen         = 3*sizeof(int),
 743                 .mode           = 0644,
 744                 .proc_handler   = proc_dointvec,
 745         },
 746 #endif
 747 #ifdef CONFIG_MAGIC_SYSRQ
 748         {
 749                 .procname       = "sysrq",
 750                 .data           = &__sysrq_enabled,
 751                 .maxlen         = sizeof (int),
 752                 .mode           = 0644,
 753                 .proc_handler   = sysrq_sysctl_handler,
 754         },
 755 #endif
 756 #ifdef CONFIG_PROC_SYSCTL
 757         {
 758                 .procname       = "cad_pid",
 759                 .data           = NULL,
 760                 .maxlen         = sizeof (int),
 761                 .mode           = 0600,
 762                 .proc_handler   = proc_do_cad_pid,
 763         },
 764 #endif
 765         {
 766                 .procname       = "threads-max",
 767                 .data           = NULL,
 768                 .maxlen         = sizeof(int),
 769                 .mode           = 0644,
 770                 .proc_handler   = sysctl_max_threads,
 771         },
 772         {
 773                 .procname       = "random",
 774                 .mode           = 0555,
 775                 .child          = random_table,
 776         },
 777         {
 778                 .procname       = "usermodehelper",
 779                 .mode           = 0555,
 780                 .child          = usermodehelper_table,
 781         },
 782 #ifdef CONFIG_FW_LOADER_USER_HELPER
 783         {
 784                 .procname       = "firmware_config",
 785                 .mode           = 0555,
 786                 .child          = firmware_config_table,
 787         },
 788 #endif
 789         {
 790                 .procname       = "overflowuid",
 791                 .data           = &overflowuid,
 792                 .maxlen         = sizeof(int),
 793                 .mode           = 0644,
 794                 .proc_handler   = proc_dointvec_minmax,
 795                 .extra1         = &minolduid,
 796                 .extra2         = &maxolduid,
 797         },
 798         {
 799                 .procname       = "overflowgid",
 800                 .data           = &overflowgid,
 801                 .maxlen         = sizeof(int),
 802                 .mode           = 0644,
 803                 .proc_handler   = proc_dointvec_minmax,
 804                 .extra1         = &minolduid,
 805                 .extra2         = &maxolduid,
 806         },
 807 #ifdef CONFIG_S390
 808         {
 809                 .procname       = "userprocess_debug",
 810                 .data           = &show_unhandled_signals,
 811                 .maxlen         = sizeof(int),
 812                 .mode           = 0644,
 813                 .proc_handler   = proc_dointvec,
 814         },
 815 #endif
 816         {
 817                 .procname       = "pid_max",
 818                 .data           = &pid_max,
 819                 .maxlen         = sizeof (int),
 820                 .mode           = 0644,
 821                 .proc_handler   = proc_dointvec_minmax,
 822                 .extra1         = &pid_max_min,
 823                 .extra2         = &pid_max_max,
 824         },
 825         {
 826                 .procname       = "panic_on_oops",
 827                 .data           = &panic_on_oops,
 828                 .maxlen         = sizeof(int),
 829                 .mode           = 0644,
 830                 .proc_handler   = proc_dointvec,
 831         },
 832         {
 833                 .procname       = "panic_print",
 834                 .data           = &panic_print,
 835                 .maxlen         = sizeof(unsigned long),
 836                 .mode           = 0644,
 837                 .proc_handler   = proc_doulongvec_minmax,
 838         },
 839 #if defined CONFIG_PRINTK
 840         {
 841                 .procname       = "printk",
 842                 .data           = &console_loglevel,
 843                 .maxlen         = 4*sizeof(int),
 844                 .mode           = 0644,
 845                 .proc_handler   = proc_dointvec,
 846         },
 847         {
 848                 .procname       = "printk_ratelimit",
 849                 .data           = &printk_ratelimit_state.interval,
 850                 .maxlen         = sizeof(int),
 851                 .mode           = 0644,
 852                 .proc_handler   = proc_dointvec_jiffies,
 853         },
 854         {
 855                 .procname       = "printk_ratelimit_burst",
 856                 .data           = &printk_ratelimit_state.burst,
 857                 .maxlen         = sizeof(int),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_dointvec,
 860         },
 861         {
 862                 .procname       = "printk_delay",
 863                 .data           = &printk_delay_msec,
 864                 .maxlen         = sizeof(int),
 865                 .mode           = 0644,
 866                 .proc_handler   = proc_dointvec_minmax,
 867                 .extra1         = SYSCTL_ZERO,
 868                 .extra2         = &ten_thousand,
 869         },
 870         {
 871                 .procname       = "printk_devkmsg",
 872                 .data           = devkmsg_log_str,
 873                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
 874                 .mode           = 0644,
 875                 .proc_handler   = devkmsg_sysctl_set_loglvl,
 876         },
 877         {
 878                 .procname       = "dmesg_restrict",
 879                 .data           = &dmesg_restrict,
 880                 .maxlen         = sizeof(int),
 881                 .mode           = 0644,
 882                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 883                 .extra1         = SYSCTL_ZERO,
 884                 .extra2         = SYSCTL_ONE,
 885         },
 886         {
 887                 .procname       = "kptr_restrict",
 888                 .data           = &kptr_restrict,
 889                 .maxlen         = sizeof(int),
 890                 .mode           = 0644,
 891                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 892                 .extra1         = SYSCTL_ZERO,
 893                 .extra2         = &two,
 894         },
 895 #endif
 896         {
 897                 .procname       = "ngroups_max",
 898                 .data           = &ngroups_max,
 899                 .maxlen         = sizeof (int),
 900                 .mode           = 0444,
 901                 .proc_handler   = proc_dointvec,
 902         },
 903         {
 904                 .procname       = "cap_last_cap",
 905                 .data           = (void *)&cap_last_cap,
 906                 .maxlen         = sizeof(int),
 907                 .mode           = 0444,
 908                 .proc_handler   = proc_dointvec,
 909         },
 910 #if defined(CONFIG_LOCKUP_DETECTOR)
 911         {
 912                 .procname       = "watchdog",
 913                 .data           = &watchdog_user_enabled,
 914                 .maxlen         = sizeof(int),
 915                 .mode           = 0644,
 916                 .proc_handler   = proc_watchdog,
 917                 .extra1         = SYSCTL_ZERO,
 918                 .extra2         = SYSCTL_ONE,
 919         },
 920         {
 921                 .procname       = "watchdog_thresh",
 922                 .data           = &watchdog_thresh,
 923                 .maxlen         = sizeof(int),
 924                 .mode           = 0644,
 925                 .proc_handler   = proc_watchdog_thresh,
 926                 .extra1         = SYSCTL_ZERO,
 927                 .extra2         = &sixty,
 928         },
 929         {
 930                 .procname       = "nmi_watchdog",
 931                 .data           = &nmi_watchdog_user_enabled,
 932                 .maxlen         = sizeof(int),
 933                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
 934                 .proc_handler   = proc_nmi_watchdog,
 935                 .extra1         = SYSCTL_ZERO,
 936                 .extra2         = SYSCTL_ONE,
 937         },
 938         {
 939                 .procname       = "watchdog_cpumask",
 940                 .data           = &watchdog_cpumask_bits,
 941                 .maxlen         = NR_CPUS,
 942                 .mode           = 0644,
 943                 .proc_handler   = proc_watchdog_cpumask,
 944         },
 945 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
 946         {
 947                 .procname       = "soft_watchdog",
 948                 .data           = &soft_watchdog_user_enabled,
 949                 .maxlen         = sizeof(int),
 950                 .mode           = 0644,
 951                 .proc_handler   = proc_soft_watchdog,
 952                 .extra1         = SYSCTL_ZERO,
 953                 .extra2         = SYSCTL_ONE,
 954         },
 955         {
 956                 .procname       = "softlockup_panic",
 957                 .data           = &softlockup_panic,
 958                 .maxlen         = sizeof(int),
 959                 .mode           = 0644,
 960                 .proc_handler   = proc_dointvec_minmax,
 961                 .extra1         = SYSCTL_ZERO,
 962                 .extra2         = SYSCTL_ONE,
 963         },
 964 #ifdef CONFIG_SMP
 965         {
 966                 .procname       = "softlockup_all_cpu_backtrace",
 967                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 968                 .maxlen         = sizeof(int),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_dointvec_minmax,
 971                 .extra1         = SYSCTL_ZERO,
 972                 .extra2         = SYSCTL_ONE,
 973         },
 974 #endif /* CONFIG_SMP */
 975 #endif
 976 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 977         {
 978                 .procname       = "hardlockup_panic",
 979                 .data           = &hardlockup_panic,
 980                 .maxlen         = sizeof(int),
 981                 .mode           = 0644,
 982                 .proc_handler   = proc_dointvec_minmax,
 983                 .extra1         = SYSCTL_ZERO,
 984                 .extra2         = SYSCTL_ONE,
 985         },
 986 #ifdef CONFIG_SMP
 987         {
 988                 .procname       = "hardlockup_all_cpu_backtrace",
 989                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
 990                 .maxlen         = sizeof(int),
 991                 .mode           = 0644,
 992                 .proc_handler   = proc_dointvec_minmax,
 993                 .extra1         = SYSCTL_ZERO,
 994                 .extra2         = SYSCTL_ONE,
 995         },
 996 #endif /* CONFIG_SMP */
 997 #endif
 998 #endif
 999
1000 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1001         {
1002                 .procname       = "unknown_nmi_panic",
1003                 .data           = &unknown_nmi_panic,
1004                 .maxlen         = sizeof (int),
1005                 .mode           = 0644,
1006                 .proc_handler   = proc_dointvec,
1007         },
1008 #endif
1009 #if defined(CONFIG_X86)
1010         {
1011                 .procname       = "panic_on_unrecovered_nmi",
1012                 .data           = &panic_on_unrecovered_nmi,
1013                 .maxlen         = sizeof(int),
1014                 .mode           = 0644,
1015                 .proc_handler   = proc_dointvec,
1016         },
1017         {
1018                 .procname       = "panic_on_io_nmi",
1019                 .data           = &panic_on_io_nmi,
1020                 .maxlen         = sizeof(int),
1021                 .mode           = 0644,
1022                 .proc_handler   = proc_dointvec,
1023         },
1024 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1025         {
1026                 .procname       = "panic_on_stackoverflow",
1027                 .data           = &sysctl_panic_on_stackoverflow,
1028                 .maxlen         = sizeof(int),
1029                 .mode           = 0644,
1030                 .proc_handler   = proc_dointvec,
1031         },
1032 #endif
1033         {
1034                 .procname       = "bootloader_type",
1035                 .data           = &bootloader_type,
1036                 .maxlen         = sizeof (int),
1037                 .mode           = 0444,
1038                 .proc_handler   = proc_dointvec,
1039         },
1040         {
1041                 .procname       = "bootloader_version",
1042                 .data           = &bootloader_version,
1043                 .maxlen         = sizeof (int),
1044                 .mode           = 0444,
1045                 .proc_handler   = proc_dointvec,
1046         },
1047         {
1048                 .procname       = "io_delay_type",
1049                 .data           = &io_delay_type,
1050                 .maxlen         = sizeof(int),
1051                 .mode           = 0644,
1052                 .proc_handler   = proc_dointvec,
1053         },
1054 #endif
1055 #if defined(CONFIG_MMU)
1056         {
1057                 .procname       = "randomize_va_space",
1058                 .data           = &randomize_va_space,
1059                 .maxlen         = sizeof(int),
1060                 .mode           = 0644,
1061                 .proc_handler   = proc_dointvec,
1062         },
1063 #endif
1064 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1065         {
1066                 .procname       = "spin_retry",
1067                 .data           = &spin_retry,
1068                 .maxlen         = sizeof (int),
1069                 .mode           = 0644,
1070                 .proc_handler   = proc_dointvec,
1071         },
1072 #endif
1073 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1074         {
1075                 .procname       = "acpi_video_flags",
1076                 .data           = &acpi_realmode_flags,
1077                 .maxlen         = sizeof (unsigned long),
1078                 .mode           = 0644,
1079                 .proc_handler   = proc_doulongvec_minmax,
1080         },
1081 #endif
1082 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1083         {
1084                 .procname       = "ignore-unaligned-usertrap",
1085                 .data           = &no_unaligned_warning,
1086                 .maxlen         = sizeof (int),
1087                 .mode           = 0644,
1088                 .proc_handler   = proc_dointvec,
1089         },
1090 #endif
1091 #ifdef CONFIG_IA64
1092         {
1093                 .procname       = "unaligned-dump-stack",
1094                 .data           = &unaligned_dump_stack,
1095                 .maxlen         = sizeof (int),
1096                 .mode           = 0644,
1097                 .proc_handler   = proc_dointvec,
1098         },
1099 #endif
1100 #ifdef CONFIG_DETECT_HUNG_TASK
1101         {
1102                 .procname       = "hung_task_panic",
1103                 .data           = &sysctl_hung_task_panic,
1104                 .maxlen         = sizeof(int),
1105                 .mode           = 0644,
1106                 .proc_handler   = proc_dointvec_minmax,
1107                 .extra1         = SYSCTL_ZERO,
1108                 .extra2         = SYSCTL_ONE,
1109         },
1110         {
1111                 .procname       = "hung_task_check_count",
1112                 .data           = &sysctl_hung_task_check_count,
1113                 .maxlen         = sizeof(int),
1114                 .mode           = 0644,
1115                 .proc_handler   = proc_dointvec_minmax,
1116                 .extra1         = SYSCTL_ZERO,
1117         },
1118         {
1119                 .procname       = "hung_task_timeout_secs",
1120                 .data           = &sysctl_hung_task_timeout_secs,
1121                 .maxlen         = sizeof(unsigned long),
1122                 .mode           = 0644,
1123                 .proc_handler   = proc_dohung_task_timeout_secs,
1124                 .extra2         = &hung_task_timeout_max,
1125         },
1126         {
1127                 .procname       = "hung_task_check_interval_secs",
1128                 .data           = &sysctl_hung_task_check_interval_secs,
1129                 .maxlen         = sizeof(unsigned long),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dohung_task_timeout_secs,
1132                 .extra2         = &hung_task_timeout_max,
1133         },
1134         {
1135                 .procname       = "hung_task_warnings",
1136                 .data           = &sysctl_hung_task_warnings,
1137                 .maxlen         = sizeof(int),
1138                 .mode           = 0644,
1139                 .proc_handler   = proc_dointvec_minmax,
1140                 .extra1         = &neg_one,
1141         },
1142 #endif
1143 #ifdef CONFIG_RT_MUTEXES
1144         {
1145                 .procname       = "max_lock_depth",
1146                 .data           = &max_lock_depth,
1147                 .maxlen         = sizeof(int),
1148                 .mode           = 0644,
1149                 .proc_handler   = proc_dointvec,
1150         },
1151 #endif
1152         {
1153                 .procname       = "poweroff_cmd",
1154                 .data           = &poweroff_cmd,
1155                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1156                 .mode           = 0644,
1157                 .proc_handler   = proc_dostring,
1158         },
1159 #ifdef CONFIG_KEYS
1160         {
1161                 .procname       = "keys",
1162                 .mode           = 0555,
1163                 .child          = key_sysctls,
1164         },
1165 #endif
1166 #ifdef CONFIG_PERF_EVENTS
1167         /*
1168          * User-space scripts rely on the existence of this file
1169          * as a feature check for perf_events being enabled.
1170          *
1171          * So it's an ABI, do not remove!
1172          */
1173         {
1174                 .procname       = "perf_event_paranoid",
1175                 .data           = &sysctl_perf_event_paranoid,
1176                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1177                 .mode           = 0644,
1178                 .proc_handler   = proc_dointvec,
1179         },
1180         {
1181                 .procname       = "perf_event_mlock_kb",
1182                 .data           = &sysctl_perf_event_mlock,
1183                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1184                 .mode           = 0644,
1185                 .proc_handler   = proc_dointvec,
1186         },
1187         {
1188                 .procname       = "perf_event_max_sample_rate",
1189                 .data           = &sysctl_perf_event_sample_rate,
1190                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1191                 .mode           = 0644,
1192                 .proc_handler   = perf_proc_update_handler,
1193                 .extra1         = SYSCTL_ONE,
1194         },
1195         {
1196                 .procname       = "perf_cpu_time_max_percent",
1197                 .data           = &sysctl_perf_cpu_time_max_percent,
1198                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1199                 .mode           = 0644,
1200                 .proc_handler   = perf_cpu_time_max_percent_handler,
1201                 .extra1         = SYSCTL_ZERO,
1202                 .extra2         = &one_hundred,
1203         },
1204         {
1205                 .procname       = "perf_event_max_stack",
1206                 .data           = &sysctl_perf_event_max_stack,
1207                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
1208                 .mode           = 0644,
1209                 .proc_handler   = perf_event_max_stack_handler,
1210                 .extra1         = SYSCTL_ZERO,
1211                 .extra2         = &six_hundred_forty_kb,
1212         },
1213         {
1214                 .procname       = "perf_event_max_contexts_per_stack",
1215                 .data           = &sysctl_perf_event_max_contexts_per_stack,
1216                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
1217                 .mode           = 0644,
1218                 .proc_handler   = perf_event_max_stack_handler,
1219                 .extra1         = SYSCTL_ZERO,
1220                 .extra2         = &one_thousand,
1221         },
1222 #endif
1223         {
1224                 .procname       = "panic_on_warn",
1225                 .data           = &panic_on_warn,
1226                 .maxlen         = sizeof(int),
1227                 .mode           = 0644,
1228                 .proc_handler   = proc_dointvec_minmax,
1229                 .extra1         = SYSCTL_ZERO,
1230                 .extra2         = SYSCTL_ONE,
1231         },
1232 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1233         {
1234                 .procname       = "timer_migration",
1235                 .data           = &sysctl_timer_migration,
1236                 .maxlen         = sizeof(unsigned int),
1237                 .mode           = 0644,
1238                 .proc_handler   = timer_migration_handler,
1239                 .extra1         = SYSCTL_ZERO,
1240                 .extra2         = SYSCTL_ONE,
1241         },
1242 #endif
1243 #ifdef CONFIG_BPF_SYSCALL
1244         {
1245                 .procname       = "unprivileged_bpf_disabled",
1246                 .data           = &sysctl_unprivileged_bpf_disabled,
1247                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
1248                 .mode           = 0644,
1249                 /* only handle a transition from default "0" to "1" */
1250                 .proc_handler   = proc_dointvec_minmax,
1251                 .extra1         = SYSCTL_ONE,
1252                 .extra2         = SYSCTL_ONE,
1253         },
1254         {
1255                 .procname       = "bpf_stats_enabled",
1256                 .data           = &bpf_stats_enabled_key.key,
1257                 .maxlen         = sizeof(bpf_stats_enabled_key),
1258                 .mode           = 0644,
1259                 .proc_handler   = proc_do_static_key,
1260         },
1261 #endif
1262 #if defined(CONFIG_TREE_RCU)
1263         {
1264                 .procname       = "panic_on_rcu_stall",
1265                 .data           = &sysctl_panic_on_rcu_stall,
1266                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
1267                 .mode           = 0644,
1268                 .proc_handler   = proc_dointvec_minmax,
1269                 .extra1         = SYSCTL_ZERO,
1270                 .extra2         = SYSCTL_ONE,
1271         },
1272 #endif
1273 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1274         {
1275                 .procname       = "stack_erasing",
1276                 .data           = NULL,
1277                 .maxlen         = sizeof(int),
1278                 .mode           = 0600,
1279                 .proc_handler   = stack_erasing_sysctl,
1280                 .extra1         = SYSCTL_ZERO,
1281                 .extra2         = SYSCTL_ONE,
1282         },
1283 #endif
1284         { }
1285 };
1286
1287 static struct ctl_table vm_table[] = {
1288         {
1289                 .procname       = "overcommit_memory",
1290                 .data           = &sysctl_overcommit_memory,
1291                 .maxlen         = sizeof(sysctl_overcommit_memory),
1292                 .mode           = 0644,
1293                 .proc_handler   = proc_dointvec_minmax,
1294                 .extra1         = SYSCTL_ZERO,
1295                 .extra2         = &two,
1296         },
1297         {
1298                 .procname       = "panic_on_oom",
1299                 .data           = &sysctl_panic_on_oom,
1300                 .maxlen         = sizeof(sysctl_panic_on_oom),
1301                 .mode           = 0644,
1302                 .proc_handler   = proc_dointvec_minmax,
1303                 .extra1         = SYSCTL_ZERO,
1304                 .extra2         = &two,
1305         },
1306         {
1307                 .procname       = "oom_kill_allocating_task",
1308                 .data           = &sysctl_oom_kill_allocating_task,
1309                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1310                 .mode           = 0644,
1311                 .proc_handler   = proc_dointvec,
1312         },
1313         {
1314                 .procname       = "oom_dump_tasks",
1315                 .data           = &sysctl_oom_dump_tasks,
1316                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1317                 .mode           = 0644,
1318                 .proc_handler   = proc_dointvec,
1319         },
1320         {
1321                 .procname       = "overcommit_ratio",
1322                 .data           = &sysctl_overcommit_ratio,
1323                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1324                 .mode           = 0644,
1325                 .proc_handler   = overcommit_ratio_handler,
1326         },
1327         {
1328                 .procname       = "overcommit_kbytes",
1329                 .data           = &sysctl_overcommit_kbytes,
1330                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1331                 .mode           = 0644,
1332                 .proc_handler   = overcommit_kbytes_handler,
1333         },
1334         {
1335                 .procname       = "page-cluster",
1336                 .data           = &page_cluster,
1337                 .maxlen         = sizeof(int),
1338                 .mode           = 0644,
1339                 .proc_handler   = proc_dointvec_minmax,
1340                 .extra1         = SYSCTL_ZERO,
1341         },
1342         {
1343                 .procname       = "dirty_background_ratio",
1344                 .data           = &dirty_background_ratio,
1345                 .maxlen         = sizeof(dirty_background_ratio),
1346                 .mode           = 0644,
1347                 .proc_handler   = dirty_background_ratio_handler,
1348                 .extra1         = SYSCTL_ZERO,
1349                 .extra2         = &one_hundred,
1350         },
1351         {
1352                 .procname       = "dirty_background_bytes",
1353                 .data           = &dirty_background_bytes,
1354                 .maxlen         = sizeof(dirty_background_bytes),
1355                 .mode           = 0644,
1356                 .proc_handler   = dirty_background_bytes_handler,
1357                 .extra1         = &one_ul,
1358         },
1359         {
1360                 .procname       = "dirty_ratio",
1361                 .data           = &vm_dirty_ratio,
1362                 .maxlen         = sizeof(vm_dirty_ratio),
1363                 .mode           = 0644,
1364                 .proc_handler   = dirty_ratio_handler,
1365                 .extra1         = SYSCTL_ZERO,
1366                 .extra2         = &one_hundred,
1367         },
1368         {
1369                 .procname       = "dirty_bytes",
1370                 .data           = &vm_dirty_bytes,
1371                 .maxlen         = sizeof(vm_dirty_bytes),
1372                 .mode           = 0644,
1373                 .proc_handler   = dirty_bytes_handler,
1374                 .extra1         = &dirty_bytes_min,
1375         },
1376         {
1377                 .procname       = "dirty_writeback_centisecs",
1378                 .data           = &dirty_writeback_interval,
1379                 .maxlen         = sizeof(dirty_writeback_interval),
1380                 .mode           = 0644,
1381                 .proc_handler   = dirty_writeback_centisecs_handler,
1382         },
1383         {
1384                 .procname       = "dirty_expire_centisecs",
1385                 .data           = &dirty_expire_interval,
1386                 .maxlen         = sizeof(dirty_expire_interval),
1387                 .mode           = 0644,
1388                 .proc_handler   = proc_dointvec_minmax,
1389                 .extra1         = SYSCTL_ZERO,
1390         },
1391         {
1392                 .procname       = "dirtytime_expire_seconds",
1393                 .data           = &dirtytime_expire_interval,
1394                 .maxlen         = sizeof(dirtytime_expire_interval),
1395                 .mode           = 0644,
1396                 .proc_handler   = dirtytime_interval_handler,
1397                 .extra1         = SYSCTL_ZERO,
1398         },
1399         {
1400                 .procname       = "swappiness",
1401                 .data           = &vm_swappiness,
1402                 .maxlen         = sizeof(vm_swappiness),
1403                 .mode           = 0644,
1404                 .proc_handler   = proc_dointvec_minmax,
1405                 .extra1         = SYSCTL_ZERO,
1406                 .extra2         = &one_hundred,
1407         },
1408 #ifdef CONFIG_HUGETLB_PAGE
1409         {
1410                 .procname       = "nr_hugepages",
1411                 .data           = NULL,
1412                 .maxlen         = sizeof(unsigned long),
1413                 .mode           = 0644,
1414                 .proc_handler   = hugetlb_sysctl_handler,
1415         },
1416 #ifdef CONFIG_NUMA
1417         {
1418                 .procname       = "nr_hugepages_mempolicy",
1419                 .data           = NULL,
1420                 .maxlen         = sizeof(unsigned long),
1421                 .mode           = 0644,
1422                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1423         },
1424         {
1425                 .procname               = "numa_stat",
1426                 .data                   = &sysctl_vm_numa_stat,
1427                 .maxlen                 = sizeof(int),
1428                 .mode                   = 0644,
1429                 .proc_handler   = sysctl_vm_numa_stat_handler,
1430                 .extra1                 = SYSCTL_ZERO,
1431                 .extra2                 = SYSCTL_ONE,
1432         },
1433 #endif
1434          {
1435                 .procname       = "hugetlb_shm_group",
1436                 .data           = &sysctl_hugetlb_shm_group,
1437                 .maxlen         = sizeof(gid_t),
1438                 .mode           = 0644,
1439                 .proc_handler   = proc_dointvec,
1440          },
1441         {
1442                 .procname       = "nr_overcommit_hugepages",
1443                 .data           = NULL,
1444                 .maxlen         = sizeof(unsigned long),
1445                 .mode           = 0644,
1446                 .proc_handler   = hugetlb_overcommit_handler,
1447         },
1448 #endif
1449         {
1450                 .procname       = "lowmem_reserve_ratio",
1451                 .data           = &sysctl_lowmem_reserve_ratio,
1452                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1453                 .mode           = 0644,
1454                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1455         },
1456         {
1457                 .procname       = "drop_caches",
1458                 .data           = &sysctl_drop_caches,
1459                 .maxlen         = sizeof(int),
1460                 .mode           = 0200,
1461                 .proc_handler   = drop_caches_sysctl_handler,
1462                 .extra1         = SYSCTL_ONE,
1463                 .extra2         = &four,
1464         },
1465 #ifdef CONFIG_COMPACTION
1466         {
1467                 .procname       = "compact_memory",
1468                 .data           = &sysctl_compact_memory,
1469                 .maxlen         = sizeof(int),
1470                 .mode           = 0200,
1471                 .proc_handler   = sysctl_compaction_handler,
1472         },
1473         {
1474                 .procname       = "extfrag_threshold",
1475                 .data           = &sysctl_extfrag_threshold,
1476                 .maxlen         = sizeof(int),
1477                 .mode           = 0644,
1478                 .proc_handler   = proc_dointvec_minmax,
1479                 .extra1         = &min_extfrag_threshold,
1480                 .extra2         = &max_extfrag_threshold,
1481         },
1482         {
1483                 .procname       = "compact_unevictable_allowed",
1484                 .data           = &sysctl_compact_unevictable_allowed,
1485                 .maxlen         = sizeof(int),
1486                 .mode           = 0644,
1487                 .proc_handler   = proc_dointvec,
1488                 .extra1         = SYSCTL_ZERO,
1489                 .extra2         = SYSCTL_ONE,
1490         },
1491
1492 #endif /* CONFIG_COMPACTION */
1493         {
1494                 .procname       = "min_free_kbytes",
1495                 .data           = &min_free_kbytes,
1496                 .maxlen         = sizeof(min_free_kbytes),
1497                 .mode           = 0644,
1498                 .proc_handler   = min_free_kbytes_sysctl_handler,
1499                 .extra1         = SYSCTL_ZERO,
1500         },
1501         {
1502                 .procname       = "watermark_boost_factor",
1503                 .data           = &watermark_boost_factor,
1504                 .maxlen         = sizeof(watermark_boost_factor),
1505                 .mode           = 0644,
1506                 .proc_handler   = watermark_boost_factor_sysctl_handler,
1507                 .extra1         = SYSCTL_ZERO,
1508         },
1509         {
1510                 .procname       = "watermark_scale_factor",
1511                 .data           = &watermark_scale_factor,
1512                 .maxlen         = sizeof(watermark_scale_factor),
1513                 .mode           = 0644,
1514                 .proc_handler   = watermark_scale_factor_sysctl_handler,
1515                 .extra1         = SYSCTL_ONE,
1516                 .extra2         = &one_thousand,
1517         },
1518         {
1519                 .procname       = "percpu_pagelist_fraction",
1520                 .data           = &percpu_pagelist_fraction,
1521                 .maxlen         = sizeof(percpu_pagelist_fraction),
1522                 .mode           = 0644,
1523                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1524                 .extra1         = SYSCTL_ZERO,
1525         },
1526 #ifdef CONFIG_MMU
1527         {
1528                 .procname       = "max_map_count",
1529                 .data           = &sysctl_max_map_count,
1530                 .maxlen         = sizeof(sysctl_max_map_count),
1531                 .mode           = 0644,
1532                 .proc_handler   = proc_dointvec_minmax,
1533                 .extra1         = SYSCTL_ZERO,
1534         },
1535 #else
1536         {
1537                 .procname       = "nr_trim_pages",
1538                 .data           = &sysctl_nr_trim_pages,
1539                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1540                 .mode           = 0644,
1541                 .proc_handler   = proc_dointvec_minmax,
1542                 .extra1         = SYSCTL_ZERO,
1543         },
1544 #endif
1545         {
1546                 .procname       = "laptop_mode",
1547                 .data           = &laptop_mode,
1548                 .maxlen         = sizeof(laptop_mode),
1549                 .mode           = 0644,
1550                 .proc_handler   = proc_dointvec_jiffies,
1551         },
1552         {
1553                 .procname       = "block_dump",
1554                 .data           = &block_dump,
1555                 .maxlen         = sizeof(block_dump),
1556                 .mode           = 0644,
1557                 .proc_handler   = proc_dointvec,
1558                 .extra1         = SYSCTL_ZERO,
1559         },
1560         {
1561                 .procname       = "vfs_cache_pressure",
1562                 .data           = &sysctl_vfs_cache_pressure,
1563                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1564                 .mode           = 0644,
1565                 .proc_handler   = proc_dointvec,
1566                 .extra1         = SYSCTL_ZERO,
1567         },
1568 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
1569     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
1570         {
1571                 .procname       = "legacy_va_layout",
1572                 .data           = &sysctl_legacy_va_layout,
1573                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1574                 .mode           = 0644,
1575                 .proc_handler   = proc_dointvec,
1576                 .extra1         = SYSCTL_ZERO,
1577         },
1578 #endif
1579 #ifdef CONFIG_NUMA
1580         {
1581                 .procname       = "zone_reclaim_mode",
1582                 .data           = &node_reclaim_mode,
1583                 .maxlen         = sizeof(node_reclaim_mode),
1584                 .mode           = 0644,
1585                 .proc_handler   = proc_dointvec,
1586                 .extra1         = SYSCTL_ZERO,
1587         },
1588         {
1589                 .procname       = "min_unmapped_ratio",
1590                 .data           = &sysctl_min_unmapped_ratio,
1591                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1592                 .mode           = 0644,
1593                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1594                 .extra1         = SYSCTL_ZERO,
1595                 .extra2         = &one_hundred,
1596         },
1597         {
1598                 .procname       = "min_slab_ratio",
1599                 .data           = &sysctl_min_slab_ratio,
1600                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1601                 .mode           = 0644,
1602                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1603                 .extra1         = SYSCTL_ZERO,
1604                 .extra2         = &one_hundred,
1605         },
1606 #endif
1607 #ifdef CONFIG_SMP
1608         {
1609                 .procname       = "stat_interval",
1610                 .data           = &sysctl_stat_interval,
1611                 .maxlen         = sizeof(sysctl_stat_interval),
1612                 .mode           = 0644,
1613                 .proc_handler   = proc_dointvec_jiffies,
1614         },
1615         {
1616                 .procname       = "stat_refresh",
1617                 .data           = NULL,
1618                 .maxlen         = 0,
1619                 .mode           = 0600,
1620                 .proc_handler   = vmstat_refresh,
1621         },
1622 #endif
1623 #ifdef CONFIG_MMU
1624         {
1625                 .procname       = "mmap_min_addr",
1626                 .data           = &dac_mmap_min_addr,
1627                 .maxlen         = sizeof(unsigned long),
1628                 .mode           = 0644,
1629                 .proc_handler   = mmap_min_addr_handler,
1630         },
1631 #endif
1632 #ifdef CONFIG_NUMA
1633         {
1634                 .procname       = "numa_zonelist_order",
1635                 .data           = &numa_zonelist_order,
1636                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1637                 .mode           = 0644,
1638                 .proc_handler   = numa_zonelist_order_handler,
1639         },
1640 #endif
1641 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1642    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1643         {
1644                 .procname       = "vdso_enabled",
1645 #ifdef CONFIG_X86_32
1646                 .data           = &vdso32_enabled,
1647                 .maxlen         = sizeof(vdso32_enabled),
1648 #else
1649                 .data           = &vdso_enabled,
1650                 .maxlen         = sizeof(vdso_enabled),
1651 #endif
1652                 .mode           = 0644,
1653                 .proc_handler   = proc_dointvec,
1654                 .extra1         = SYSCTL_ZERO,
1655         },
1656 #endif
1657 #ifdef CONFIG_HIGHMEM
1658         {
1659                 .procname       = "highmem_is_dirtyable",
1660                 .data           = &vm_highmem_is_dirtyable,
1661                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1662                 .mode           = 0644,
1663                 .proc_handler   = proc_dointvec_minmax,
1664                 .extra1         = SYSCTL_ZERO,
1665                 .extra2         = SYSCTL_ONE,
1666         },
1667 #endif
1668 #ifdef CONFIG_MEMORY_FAILURE
1669         {
1670                 .procname       = "memory_failure_early_kill",
1671                 .data           = &sysctl_memory_failure_early_kill,
1672                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1673                 .mode           = 0644,
1674                 .proc_handler   = proc_dointvec_minmax,
1675                 .extra1         = SYSCTL_ZERO,
1676                 .extra2         = SYSCTL_ONE,
1677         },
1678         {
1679                 .procname       = "memory_failure_recovery",
1680                 .data           = &sysctl_memory_failure_recovery,
1681                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1682                 .mode           = 0644,
1683                 .proc_handler   = proc_dointvec_minmax,
1684                 .extra1         = SYSCTL_ZERO,
1685                 .extra2         = SYSCTL_ONE,
1686         },
1687 #endif
1688         {
1689                 .procname       = "user_reserve_kbytes",
1690                 .data           = &sysctl_user_reserve_kbytes,
1691                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1692                 .mode           = 0644,
1693                 .proc_handler   = proc_doulongvec_minmax,
1694         },
1695         {
1696                 .procname       = "admin_reserve_kbytes",
1697                 .data           = &sysctl_admin_reserve_kbytes,
1698                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1699                 .mode           = 0644,
1700                 .proc_handler   = proc_doulongvec_minmax,
1701         },
1702 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1703         {
1704                 .procname       = "mmap_rnd_bits",
1705                 .data           = &mmap_rnd_bits,
1706                 .maxlen         = sizeof(mmap_rnd_bits),
1707                 .mode           = 0600,
1708                 .proc_handler   = proc_dointvec_minmax,
1709                 .extra1         = (void *)&mmap_rnd_bits_min,
1710                 .extra2         = (void *)&mmap_rnd_bits_max,
1711         },
1712 #endif
1713 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1714         {
1715                 .procname       = "mmap_rnd_compat_bits",
1716                 .data           = &mmap_rnd_compat_bits,
1717                 .maxlen         = sizeof(mmap_rnd_compat_bits),
1718                 .mode           = 0600,
1719                 .proc_handler   = proc_dointvec_minmax,
1720                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
1721                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
1722         },
1723 #endif
1724 #ifdef CONFIG_USERFAULTFD
1725         {
1726                 .procname       = "unprivileged_userfaultfd",
1727                 .data           = &sysctl_unprivileged_userfaultfd,
1728                 .maxlen         = sizeof(sysctl_unprivileged_userfaultfd),
1729                 .mode           = 0644,
1730                 .proc_handler   = proc_dointvec_minmax,
1731                 .extra1         = SYSCTL_ZERO,
1732                 .extra2         = SYSCTL_ONE,
1733         },
1734 #endif
1735         { }
1736 };
1737
1738 static struct ctl_table fs_table[] = {
1739         {
1740                 .procname       = "inode-nr",
1741                 .data           = &inodes_stat,
1742                 .maxlen         = 2*sizeof(long),
1743                 .mode           = 0444,
1744                 .proc_handler   = proc_nr_inodes,
1745         },
1746         {
1747                 .procname       = "inode-state",
1748                 .data           = &inodes_stat,
1749                 .maxlen         = 7*sizeof(long),
1750                 .mode           = 0444,
1751                 .proc_handler   = proc_nr_inodes,
1752         },
1753         {
1754                 .procname       = "file-nr",
1755                 .data           = &files_stat,
1756                 .maxlen         = sizeof(files_stat),
1757                 .mode           = 0444,
1758                 .proc_handler   = proc_nr_files,
1759         },
1760         {
1761                 .procname       = "file-max",
1762                 .data           = &files_stat.max_files,
1763                 .maxlen         = sizeof(files_stat.max_files),
1764                 .mode           = 0644,
1765                 .proc_handler   = proc_doulongvec_minmax,
1766                 .extra1         = &zero_ul,
1767                 .extra2         = &long_max,
1768         },
1769         {
1770                 .procname       = "nr_open",
1771                 .data           = &sysctl_nr_open,
1772                 .maxlen         = sizeof(unsigned int),
1773                 .mode           = 0644,
1774                 .proc_handler   = proc_dointvec_minmax,
1775                 .extra1         = &sysctl_nr_open_min,
1776                 .extra2         = &sysctl_nr_open_max,
1777         },
1778         {
1779                 .procname       = "dentry-state",
1780                 .data           = &dentry_stat,
1781                 .maxlen         = 6*sizeof(long),
1782                 .mode           = 0444,
1783                 .proc_handler   = proc_nr_dentry,
1784         },
1785         {
1786                 .procname       = "overflowuid",
1787                 .data           = &fs_overflowuid,
1788                 .maxlen         = sizeof(int),
1789                 .mode           = 0644,
1790                 .proc_handler   = proc_dointvec_minmax,
1791                 .extra1         = &minolduid,
1792                 .extra2         = &maxolduid,
1793         },
1794         {
1795                 .procname       = "overflowgid",
1796                 .data           = &fs_overflowgid,
1797                 .maxlen         = sizeof(int),
1798                 .mode           = 0644,
1799                 .proc_handler   = proc_dointvec_minmax,
1800                 .extra1         = &minolduid,
1801                 .extra2         = &maxolduid,
1802         },
1803 #ifdef CONFIG_FILE_LOCKING
1804         {
1805                 .procname       = "leases-enable",
1806                 .data           = &leases_enable,
1807                 .maxlen         = sizeof(int),
1808                 .mode           = 0644,
1809                 .proc_handler   = proc_dointvec,
1810         },
1811 #endif
1812 #ifdef CONFIG_DNOTIFY
1813         {
1814                 .procname       = "dir-notify-enable",
1815                 .data           = &dir_notify_enable,
1816                 .maxlen         = sizeof(int),
1817                 .mode           = 0644,
1818                 .proc_handler   = proc_dointvec,
1819         },
1820 #endif
1821 #ifdef CONFIG_MMU
1822 #ifdef CONFIG_FILE_LOCKING
1823         {
1824                 .procname       = "lease-break-time",
1825                 .data           = &lease_break_time,
1826                 .maxlen         = sizeof(int),
1827                 .mode           = 0644,
1828                 .proc_handler   = proc_dointvec,
1829         },
1830 #endif
1831 #ifdef CONFIG_AIO
1832         {
1833                 .procname       = "aio-nr",
1834                 .data           = &aio_nr,
1835                 .maxlen         = sizeof(aio_nr),
1836                 .mode           = 0444,
1837                 .proc_handler   = proc_doulongvec_minmax,
1838         },
1839         {
1840                 .procname       = "aio-max-nr",
1841                 .data           = &aio_max_nr,
1842                 .maxlen         = sizeof(aio_max_nr),
1843                 .mode           = 0644,
1844                 .proc_handler   = proc_doulongvec_minmax,
1845         },
1846 #endif /* CONFIG_AIO */
1847 #ifdef CONFIG_INOTIFY_USER
1848         {
1849                 .procname       = "inotify",
1850                 .mode           = 0555,
1851                 .child          = inotify_table,
1852         },
1853 #endif
1854 #ifdef CONFIG_EPOLL
1855         {
1856                 .procname       = "epoll",
1857                 .mode           = 0555,
1858                 .child          = epoll_table,
1859         },
1860 #endif
1861 #endif
1862         {
1863                 .procname       = "protected_symlinks",
1864                 .data           = &sysctl_protected_symlinks,
1865                 .maxlen         = sizeof(int),
1866                 .mode           = 0600,
1867                 .proc_handler   = proc_dointvec_minmax,
1868                 .extra1         = SYSCTL_ZERO,
1869                 .extra2         = SYSCTL_ONE,
1870         },
1871         {
1872                 .procname       = "protected_hardlinks",
1873                 .data           = &sysctl_protected_hardlinks,
1874                 .maxlen         = sizeof(int),
1875                 .mode           = 0600,
1876                 .proc_handler   = proc_dointvec_minmax,
1877                 .extra1         = SYSCTL_ZERO,
1878                 .extra2         = SYSCTL_ONE,
1879         },
1880         {
1881                 .procname       = "protected_fifos",
1882                 .data           = &sysctl_protected_fifos,
1883                 .maxlen         = sizeof(int),
1884                 .mode           = 0600,
1885                 .proc_handler   = proc_dointvec_minmax,
1886                 .extra1         = SYSCTL_ZERO,
1887                 .extra2         = &two,
1888         },
1889         {
1890                 .procname       = "protected_regular",
1891                 .data           = &sysctl_protected_regular,
1892                 .maxlen         = sizeof(int),
1893                 .mode           = 0600,
1894                 .proc_handler   = proc_dointvec_minmax,
1895                 .extra1         = SYSCTL_ZERO,
1896                 .extra2         = &two,
1897         },
1898         {
1899                 .procname       = "suid_dumpable",
1900                 .data           = &suid_dumpable,
1901                 .maxlen         = sizeof(int),
1902                 .mode           = 0644,
1903                 .proc_handler   = proc_dointvec_minmax_coredump,
1904                 .extra1         = SYSCTL_ZERO,
1905                 .extra2         = &two,
1906         },
1907 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1908         {
1909                 .procname       = "binfmt_misc",
1910                 .mode           = 0555,
1911                 .child          = sysctl_mount_point,
1912         },
1913 #endif
1914         {
1915                 .procname       = "pipe-max-size",
1916                 .data           = &pipe_max_size,
1917                 .maxlen         = sizeof(pipe_max_size),
1918                 .mode           = 0644,
1919                 .proc_handler   = proc_dopipe_max_size,
1920         },
1921         {
1922                 .procname       = "pipe-user-pages-hard",
1923                 .data           = &pipe_user_pages_hard,
1924                 .maxlen         = sizeof(pipe_user_pages_hard),
1925                 .mode           = 0644,
1926                 .proc_handler   = proc_doulongvec_minmax,
1927         },
1928         {
1929                 .procname       = "pipe-user-pages-soft",
1930                 .data           = &pipe_user_pages_soft,
1931                 .maxlen         = sizeof(pipe_user_pages_soft),
1932                 .mode           = 0644,
1933                 .proc_handler   = proc_doulongvec_minmax,
1934         },
1935         {
1936                 .procname       = "mount-max",
1937                 .data           = &sysctl_mount_max,
1938                 .maxlen         = sizeof(unsigned int),
1939                 .mode           = 0644,
1940                 .proc_handler   = proc_dointvec_minmax,
1941                 .extra1         = SYSCTL_ONE,
1942         },
1943         { }
1944 };
1945
1946 static struct ctl_table debug_table[] = {
1947 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1948         {
1949                 .procname       = "exception-trace",
1950                 .data           = &show_unhandled_signals,
1951                 .maxlen         = sizeof(int),
1952                 .mode           = 0644,
1953                 .proc_handler   = proc_dointvec
1954         },
1955 #endif
1956 #if defined(CONFIG_OPTPROBES)
1957         {
1958                 .procname       = "kprobes-optimization",
1959                 .data           = &sysctl_kprobes_optimization,
1960                 .maxlen         = sizeof(int),
1961                 .mode           = 0644,
1962                 .proc_handler   = proc_kprobes_optimization_handler,
1963                 .extra1         = SYSCTL_ZERO,
1964                 .extra2         = SYSCTL_ONE,
1965         },
1966 #endif
1967         { }
1968 };
1969
1970 static struct ctl_table dev_table[] = {
1971         { }
1972 };
1973
1974 int __init sysctl_init(void)
1975 {
1976         struct ctl_table_header *hdr;
1977
1978         hdr = register_sysctl_table(sysctl_base_table);
1979         kmemleak_not_leak(hdr);
1980         return 0;
1981 }
1982
1983 #endif /* CONFIG_SYSCTL */
1984
1985 /*
1986  * /proc/sys support
1987  */
1988
1989 #ifdef CONFIG_PROC_SYSCTL
1990
1991 static int _proc_do_string(char *data, int maxlen, int write,
1992                            char __user *buffer,
1993                            size_t *lenp, loff_t *ppos)
1994 {
1995         size_t len;
1996         char __user *p;
1997         char c;
1998
1999         if (!data || !maxlen || !*lenp) {
2000                 *lenp = 0;
2001                 return 0;
2002         }
2003
2004         if (write) {
2005                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
2006                         /* Only continue writes not past the end of buffer. */
2007                         len = strlen(data);
2008                         if (len > maxlen - 1)
2009                                 len = maxlen - 1;
2010
2011                         if (*ppos > len)
2012                                 return 0;
2013                         len = *ppos;
2014                 } else {
2015                         /* Start writing from beginning of buffer. */
2016                         len = 0;
2017                 }
2018
2019                 *ppos += *lenp;
2020                 p = buffer;
2021                 while ((p - buffer) < *lenp && len < maxlen - 1) {
2022                         if (get_user(c, p++))
2023                                 return -EFAULT;
2024                         if (c == 0 || c == '\n')
2025                                 break;
2026                         data[len++] = c;
2027                 }
2028                 data[len] = 0;
2029         } else {
2030                 len = strlen(data);
2031                 if (len > maxlen)
2032                         len = maxlen;
2033
2034                 if (*ppos > len) {
2035                         *lenp = 0;
2036                         return 0;
2037                 }
2038
2039                 data += *ppos;
2040                 len  -= *ppos;
2041
2042                 if (len > *lenp)
2043                         len = *lenp;
2044                 if (len)
2045                         if (copy_to_user(buffer, data, len))
2046                                 return -EFAULT;
2047                 if (len < *lenp) {
2048                         if (put_user('\n', buffer + len))
2049                                 return -EFAULT;
2050                         len++;
2051                 }
2052                 *lenp = len;
2053                 *ppos += len;
2054         }
2055         return 0;
2056 }
2057
2058 static void warn_sysctl_write(struct ctl_table *table)
2059 {
2060         pr_warn_once("%s wrote to %s when file position was not 0!\n"
2061                 "This will not be supported in the future. To silence this\n"
2062                 "warning, set kernel.sysctl_writes_strict = -1\n",
2063                 current->comm, table->procname);
2064 }
2065
2066 /**
2067  * proc_first_pos_non_zero_ignore - check if first position is allowed
2068  * @ppos: file position
2069  * @table: the sysctl table
2070  *
2071  * Returns true if the first position is non-zero and the sysctl_writes_strict
2072  * mode indicates this is not allowed for numeric input types. String proc
2073  * handlers can ignore the return value.
2074  */
2075 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2076                                            struct ctl_table *table)
2077 {
2078         if (!*ppos)
2079                 return false;
2080
2081         switch (sysctl_writes_strict) {
2082         case SYSCTL_WRITES_STRICT:
2083                 return true;
2084         case SYSCTL_WRITES_WARN:
2085                 warn_sysctl_write(table);
2086                 return false;
2087         default:
2088                 return false;
2089         }
2090 }
2091
2092 /**
2093  * proc_dostring - read a string sysctl
2094  * @table: the sysctl table
2095  * @write: %TRUE if this is a write to the sysctl file
2096  * @buffer: the user buffer
2097  * @lenp: the size of the user buffer
2098  * @ppos: file position
2099  *
2100  * Reads/writes a string from/to the user buffer. If the kernel
2101  * buffer provided is not large enough to hold the string, the
2102  * string is truncated. The copied string is %NULL-terminated.
2103  * If the string is being read by the user process, it is copied
2104  * and a newline '\n' is added. It is truncated if the buffer is
2105  * not large enough.
2106  *
2107  * Returns 0 on success.
2108  */
2109 int proc_dostring(struct ctl_table *table, int write,
2110                   void __user *buffer, size_t *lenp, loff_t *ppos)
2111 {
2112         if (write)
2113                 proc_first_pos_non_zero_ignore(ppos, table);
2114
2115         return _proc_do_string((char *)(table->data), table->maxlen, write,
2116                                (char __user *)buffer, lenp, ppos);
2117 }
2118
2119 static size_t proc_skip_spaces(char **buf)
2120 {
2121         size_t ret;
2122         char *tmp = skip_spaces(*buf);
2123         ret = tmp - *buf;
2124         *buf = tmp;
2125         return ret;
2126 }
2127
2128 static void proc_skip_char(char **buf, size_t *size, const char v)
2129 {
2130         while (*size) {
2131                 if (**buf != v)
2132                         break;
2133                 (*size)--;
2134                 (*buf)++;
2135         }
2136 }
2137
2138 /**
2139  * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
2140  *                   fail on overflow
2141  *
2142  * @cp: kernel buffer containing the string to parse
2143  * @endp: pointer to store the trailing characters
2144  * @base: the base to use
2145  * @res: where the parsed integer will be stored
2146  *
2147  * In case of success 0 is returned and @res will contain the parsed integer,
2148  * @endp will hold any trailing characters.
2149  * This function will fail the parse on overflow. If there wasn't an overflow
2150  * the function will defer the decision what characters count as invalid to the
2151  * caller.
2152  */
2153 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
2154                            unsigned long *res)
2155 {
2156         unsigned long long result;
2157         unsigned int rv;
2158
2159         cp = _parse_integer_fixup_radix(cp, &base);
2160         rv = _parse_integer(cp, base, &result);
2161         if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
2162                 return -ERANGE;
2163
2164         cp += rv;
2165
2166         if (endp)
2167                 *endp = (char *)cp;
2168
2169         *res = (unsigned long)result;
2170         return 0;
2171 }
2172
2173 #define TMPBUFLEN 22
2174 /**
2175  * proc_get_long - reads an ASCII formatted integer from a user buffer
2176  *
2177  * @buf: a kernel buffer
2178  * @size: size of the kernel buffer
2179  * @val: this is where the number will be stored
2180  * @neg: set to %TRUE if number is negative
2181  * @perm_tr: a vector which contains the allowed trailers
2182  * @perm_tr_len: size of the perm_tr vector
2183  * @tr: pointer to store the trailer character
2184  *
2185  * In case of success %0 is returned and @buf and @size are updated with
2186  * the amount of bytes read. If @tr is non-NULL and a trailing
2187  * character exists (size is non-zero after returning from this
2188  * function), @tr is updated with the trailing character.
2189  */
2190 static int proc_get_long(char **buf, size_t *size,
2191                           unsigned long *val, bool *neg,
2192                           const char *perm_tr, unsigned perm_tr_len, char *tr)
2193 {
2194         int len;
2195         char *p, tmp[TMPBUFLEN];
2196
2197         if (!*size)
2198                 return -EINVAL;
2199
2200         len = *size;
2201         if (len > TMPBUFLEN - 1)
2202                 len = TMPBUFLEN - 1;
2203
2204         memcpy(tmp, *buf, len);
2205
2206         tmp[len] = 0;
2207         p = tmp;
2208         if (*p == '-' && *size > 1) {
2209                 *neg = true;
2210                 p++;
2211         } else
2212                 *neg = false;
2213         if (!isdigit(*p))
2214                 return -EINVAL;
2215
2216         if (strtoul_lenient(p, &p, 0, val))
2217                 return -EINVAL;
2218
2219         len = p - tmp;
2220
2221         /* We don't know if the next char is whitespace thus we may accept
2222          * invalid integers (e.g. 1234...a) or two integers instead of one
2223          * (e.g. 123...1). So lets not allow such large numbers. */
2224         if (len == TMPBUFLEN - 1)
2225                 return -EINVAL;
2226
2227         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2228                 return -EINVAL;
2229
2230         if (tr && (len < *size))
2231                 *tr = *p;
2232
2233         *buf += len;
2234         *size -= len;
2235
2236         return 0;
2237 }
2238
2239 /**
2240  * proc_put_long - converts an integer to a decimal ASCII formatted string
2241  *
2242  * @buf: the user buffer
2243  * @size: the size of the user buffer
2244  * @val: the integer to be converted
2245  * @neg: sign of the number, %TRUE for negative
2246  *
2247  * In case of success %0 is returned and @buf and @size are updated with
2248  * the amount of bytes written.
2249  */
2250 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2251                           bool neg)
2252 {
2253         int len;
2254         char tmp[TMPBUFLEN], *p = tmp;
2255
2256         sprintf(p, "%s%lu", neg ? "-" : "", val);
2257         len = strlen(tmp);
2258         if (len > *size)
2259                 len = *size;
2260         if (copy_to_user(*buf, tmp, len))
2261                 return -EFAULT;
2262         *size -= len;
2263         *buf += len;
2264         return 0;
2265 }
2266 #undef TMPBUFLEN
2267
2268 static int proc_put_char(void __user **buf, size_t *size, char c)
2269 {
2270         if (*size) {
2271                 char __user **buffer = (char __user **)buf;
2272                 if (put_user(c, *buffer))
2273                         return -EFAULT;
2274                 (*size)--, (*buffer)++;
2275                 *buf = *buffer;
2276         }
2277         return 0;
2278 }
2279
2280 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2281                                  int *valp,
2282                                  int write, void *data)
2283 {
2284         if (write) {
2285                 if (*negp) {
2286                         if (*lvalp > (unsigned long) INT_MAX + 1)
2287                                 return -EINVAL;
2288                         *valp = -*lvalp;
2289                 } else {
2290                         if (*lvalp > (unsigned long) INT_MAX)
2291                                 return -EINVAL;
2292                         *valp = *lvalp;
2293                 }
2294         } else {
2295                 int val = *valp;
2296                 if (val < 0) {
2297                         *negp = true;
2298                         *lvalp = -(unsigned long)val;
2299                 } else {
2300                         *negp = false;
2301                         *lvalp = (unsigned long)val;
2302                 }
2303         }
2304         return 0;
2305 }
2306
2307 static int do_proc_douintvec_conv(unsigned long *lvalp,
2308                                   unsigned int *valp,
2309                                   int write, void *data)
2310 {
2311         if (write) {
2312                 if (*lvalp > UINT_MAX)
2313                         return -EINVAL;
2314                 *valp = *lvalp;
2315         } else {
2316                 unsigned int val = *valp;
2317                 *lvalp = (unsigned long)val;
2318         }
2319         return 0;
2320 }
2321
2322 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2323
2324 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2325                   int write, void __user *buffer,
2326                   size_t *lenp, loff_t *ppos,
2327                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2328                               int write, void *data),
2329                   void *data)
2330 {
2331         int *i, vleft, first = 1, err = 0;
2332         size_t left;
2333         char *kbuf = NULL, *p;
2334
2335         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2336                 *lenp = 0;
2337                 return 0;
2338         }
2339
2340         i = (int *) tbl_data;
2341         vleft = table->maxlen / sizeof(*i);
2342         left = *lenp;
2343
2344         if (!conv)
2345                 conv = do_proc_dointvec_conv;
2346
2347         if (write) {
2348                 if (proc_first_pos_non_zero_ignore(ppos, table))
2349                         goto out;
2350
2351                 if (left > PAGE_SIZE - 1)
2352                         left = PAGE_SIZE - 1;
2353                 p = kbuf = memdup_user_nul(buffer, left);
2354                 if (IS_ERR(kbuf))
2355                         return PTR_ERR(kbuf);
2356         }
2357
2358         for (; left && vleft--; i++, first=0) {
2359                 unsigned long lval;
2360                 bool neg;
2361
2362                 if (write) {
2363                         left -= proc_skip_spaces(&p);
2364
2365                         if (!left)
2366                                 break;
2367                         err = proc_get_long(&p, &left, &lval, &neg,
2368                                              proc_wspace_sep,
2369                                              sizeof(proc_wspace_sep), NULL);
2370                         if (err)
2371                                 break;
2372                         if (conv(&neg, &lval, i, 1, data)) {
2373                                 err = -EINVAL;
2374                                 break;
2375                         }
2376                 } else {
2377                         if (conv(&neg, &lval, i, 0, data)) {
2378                                 err = -EINVAL;
2379                                 break;
2380                         }
2381                         if (!first)
2382                                 err = proc_put_char(&buffer, &left, '\t');
2383                         if (err)
2384                                 break;
2385                         err = proc_put_long(&buffer, &left, lval, neg);
2386                         if (err)
2387                                 break;
2388                 }
2389         }
2390
2391         if (!write && !first && left && !err)
2392                 err = proc_put_char(&buffer, &left, '\n');
2393         if (write && !err && left)
2394                 left -= proc_skip_spaces(&p);
2395         if (write) {
2396                 kfree(kbuf);
2397                 if (first)
2398                         return err ? : -EINVAL;
2399         }
2400         *lenp -= left;
2401 out:
2402         *ppos += *lenp;
2403         return err;
2404 }
2405
2406 static int do_proc_dointvec(struct ctl_table *table, int write,
2407                   void __user *buffer, size_t *lenp, loff_t *ppos,
2408                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2409                               int write, void *data),
2410                   void *data)
2411 {
2412         return __do_proc_dointvec(table->data, table, write,
2413                         buffer, lenp, ppos, conv, data);
2414 }
2415
2416 static int do_proc_douintvec_w(unsigned int *tbl_data,
2417                                struct ctl_table *table,
2418                                void __user *buffer,
2419                                size_t *lenp, loff_t *ppos,
2420                                int (*conv)(unsigned long *lvalp,
2421                                            unsigned int *valp,
2422                                            int write, void *data),
2423                                void *data)
2424 {
2425         unsigned long lval;
2426         int err = 0;
2427         size_t left;
2428         bool neg;
2429         char *kbuf = NULL, *p;
2430
2431         left = *lenp;
2432
2433         if (proc_first_pos_non_zero_ignore(ppos, table))
2434                 goto bail_early;
2435
2436         if (left > PAGE_SIZE - 1)
2437                 left = PAGE_SIZE - 1;
2438
2439         p = kbuf = memdup_user_nul(buffer, left);
2440         if (IS_ERR(kbuf))
2441                 return -EINVAL;
2442
2443         left -= proc_skip_spaces(&p);
2444         if (!left) {
2445                 err = -EINVAL;
2446                 goto out_free;
2447         }
2448
2449         err = proc_get_long(&p, &left, &lval, &neg,
2450                              proc_wspace_sep,
2451                              sizeof(proc_wspace_sep), NULL);
2452         if (err || neg) {
2453                 err = -EINVAL;
2454                 goto out_free;
2455         }
2456
2457         if (conv(&lval, tbl_data, 1, data)) {
2458                 err = -EINVAL;
2459                 goto out_free;
2460         }
2461
2462         if (!err && left)
2463                 left -= proc_skip_spaces(&p);
2464
2465 out_free:
2466         kfree(kbuf);
2467         if (err)
2468                 return -EINVAL;
2469
2470         return 0;
2471
2472         /* This is in keeping with old __do_proc_dointvec() */
2473 bail_early:
2474         *ppos += *lenp;
2475         return err;
2476 }
2477
2478 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2479                                size_t *lenp, loff_t *ppos,
2480                                int (*conv)(unsigned long *lvalp,
2481                                            unsigned int *valp,
2482                                            int write, void *data),
2483                                void *data)
2484 {
2485         unsigned long lval;
2486         int err = 0;
2487         size_t left;
2488
2489         left = *lenp;
2490
2491         if (conv(&lval, tbl_data, 0, data)) {
2492                 err = -EINVAL;
2493                 goto out;
2494         }
2495
2496         err = proc_put_long(&buffer, &left, lval, false);
2497         if (err || !left)
2498                 goto out;
2499
2500         err = proc_put_char(&buffer, &left, '\n');
2501
2502 out:
2503         *lenp -= left;
2504         *ppos += *lenp;
2505
2506         return err;
2507 }
2508
2509 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2510                                int write, void __user *buffer,
2511                                size_t *lenp, loff_t *ppos,
2512                                int (*conv)(unsigned long *lvalp,
2513                                            unsigned int *valp,
2514                                            int write, void *data),
2515                                void *data)
2516 {
2517         unsigned int *i, vleft;
2518
2519         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2520                 *lenp = 0;
2521                 return 0;
2522         }
2523
2524         i = (unsigned int *) tbl_data;
2525         vleft = table->maxlen / sizeof(*i);
2526
2527         /*
2528          * Arrays are not supported, keep this simple. *Do not* add
2529          * support for them.
2530          */
2531         if (vleft != 1) {
2532                 *lenp = 0;
2533                 return -EINVAL;
2534         }
2535
2536         if (!conv)
2537                 conv = do_proc_douintvec_conv;
2538
2539         if (write)
2540                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2541                                            conv, data);
2542         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2543 }
2544
2545 static int do_proc_douintvec(struct ctl_table *table, int write,
2546                              void __user *buffer, size_t *lenp, loff_t *ppos,
2547                              int (*conv)(unsigned long *lvalp,
2548                                          unsigned int *valp,
2549                                          int write, void *data),
2550                              void *data)
2551 {
2552         return __do_proc_douintvec(table->data, table, write,
2553                                    buffer, lenp, ppos, conv, data);
2554 }
2555
2556 /**
2557  * proc_dointvec - read a vector of integers
2558  * @table: the sysctl table
2559  * @write: %TRUE if this is a write to the sysctl file
2560  * @buffer: the user buffer
2561  * @lenp: the size of the user buffer
2562  * @ppos: file position
2563  *
2564  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2565  * values from/to the user buffer, treated as an ASCII string.
2566  *
2567  * Returns 0 on success.
2568  */
2569 int proc_dointvec(struct ctl_table *table, int write,
2570                      void __user *buffer, size_t *lenp, loff_t *ppos)
2571 {
2572         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2573 }
2574
2575 /**
2576  * proc_douintvec - read a vector of unsigned integers
2577  * @table: the sysctl table
2578  * @write: %TRUE if this is a write to the sysctl file
2579  * @buffer: the user buffer
2580  * @lenp: the size of the user buffer
2581  * @ppos: file position
2582  *
2583  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2584  * values from/to the user buffer, treated as an ASCII string.
2585  *
2586  * Returns 0 on success.
2587  */
2588 int proc_douintvec(struct ctl_table *table, int write,
2589                      void __user *buffer, size_t *lenp, loff_t *ppos)
2590 {
2591         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2592                                  do_proc_douintvec_conv, NULL);
2593 }
2594
2595 /*
2596  * Taint values can only be increased
2597  * This means we can safely use a temporary.
2598  */
2599 static int proc_taint(struct ctl_table *table, int write,
2600                                void __user *buffer, size_t *lenp, loff_t *ppos)
2601 {
2602         struct ctl_table t;
2603         unsigned long tmptaint = get_taint();
2604         int err;
2605
2606         if (write && !capable(CAP_SYS_ADMIN))
2607                 return -EPERM;
2608
2609         t = *table;
2610         t.data = &tmptaint;
2611         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2612         if (err < 0)
2613                 return err;
2614
2615         if (write) {
2616                 /*
2617                  * Poor man's atomic or. Not worth adding a primitive
2618                  * to everyone's atomic.h for this
2619                  */
2620                 int i;
2621                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2622                         if ((tmptaint >> i) & 1)
2623                                 add_taint(i, LOCKDEP_STILL_OK);
2624                 }
2625         }
2626
2627         return err;
2628 }
2629
2630 #ifdef CONFIG_PRINTK
2631 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2632                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2633 {
2634         if (write && !capable(CAP_SYS_ADMIN))
2635                 return -EPERM;
2636
2637         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2638 }
2639 #endif
2640
2641 /**
2642  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2643  * @min: pointer to minimum allowable value
2644  * @max: pointer to maximum allowable value
2645  *
2646  * The do_proc_dointvec_minmax_conv_param structure provides the
2647  * minimum and maximum values for doing range checking for those sysctl
2648  * parameters that use the proc_dointvec_minmax() handler.
2649  */
2650 struct do_proc_dointvec_minmax_conv_param {
2651         int *min;
2652         int *max;
2653 };
2654
2655 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2656                                         int *valp,
2657                                         int write, void *data)
2658 {
2659         int tmp, ret;
2660         struct do_proc_dointvec_minmax_conv_param *param = data;
2661         /*
2662          * If writing, first do so via a temporary local int so we can
2663          * bounds-check it before touching *valp.
2664          */
2665         int *ip = write ? &tmp : valp;
2666
2667         ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
2668         if (ret)
2669                 return ret;
2670
2671         if (write) {
2672                 if ((param->min && *param->min > tmp) ||
2673                     (param->max && *param->max < tmp))
2674                         return -EINVAL;
2675                 *valp = tmp;
2676         }
2677
2678         return 0;
2679 }
2680
2681 /**
2682  * proc_dointvec_minmax - read a vector of integers with min/max values
2683  * @table: the sysctl table
2684  * @write: %TRUE if this is a write to the sysctl file
2685  * @buffer: the user buffer
2686  * @lenp: the size of the user buffer
2687  * @ppos: file position
2688  *
2689  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2690  * values from/to the user buffer, treated as an ASCII string.
2691  *
2692  * This routine will ensure the values are within the range specified by
2693  * table->extra1 (min) and table->extra2 (max).
2694  *
2695  * Returns 0 on success or -EINVAL on write when the range check fails.
2696  */
2697 int proc_dointvec_minmax(struct ctl_table *table, int write,
2698                   void __user *buffer, size_t *lenp, loff_t *ppos)
2699 {
2700         struct do_proc_dointvec_minmax_conv_param param = {
2701                 .min = (int *) table->extra1,
2702                 .max = (int *) table->extra2,
2703         };
2704         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2705                                 do_proc_dointvec_minmax_conv, &param);
2706 }
2707
2708 /**
2709  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2710  * @min: pointer to minimum allowable value
2711  * @max: pointer to maximum allowable value
2712  *
2713  * The do_proc_douintvec_minmax_conv_param structure provides the
2714  * minimum and maximum values for doing range checking for those sysctl
2715  * parameters that use the proc_douintvec_minmax() handler.
2716  */
2717 struct do_proc_douintvec_minmax_conv_param {
2718         unsigned int *min;
2719         unsigned int *max;
2720 };
2721
2722 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2723                                          unsigned int *valp,
2724                                          int write, void *data)
2725 {
2726         int ret;
2727         unsigned int tmp;
2728         struct do_proc_douintvec_minmax_conv_param *param = data;
2729         /* write via temporary local uint for bounds-checking */
2730         unsigned int *up = write ? &tmp : valp;
2731
2732         ret = do_proc_douintvec_conv(lvalp, up, write, data);
2733         if (ret)
2734                 return ret;
2735
2736         if (write) {
2737                 if ((param->min && *param->min > tmp) ||
2738                     (param->max && *param->max < tmp))
2739                         return -ERANGE;
2740
2741                 *valp = tmp;
2742         }
2743
2744         return 0;
2745 }
2746
2747 /**
2748  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2749  * @table: the sysctl table
2750  * @write: %TRUE if this is a write to the sysctl file
2751  * @buffer: the user buffer
2752  * @lenp: the size of the user buffer
2753  * @ppos: file position
2754  *
2755  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2756  * values from/to the user buffer, treated as an ASCII string. Negative
2757  * strings are not allowed.
2758  *
2759  * This routine will ensure the values are within the range specified by
2760  * table->extra1 (min) and table->extra2 (max). There is a final sanity
2761  * check for UINT_MAX to avoid having to support wrap around uses from
2762  * userspace.
2763  *
2764  * Returns 0 on success or -ERANGE on write when the range check fails.
2765  */
2766 int proc_douintvec_minmax(struct ctl_table *table, int write,
2767                           void __user *buffer, size_t *lenp, loff_t *ppos)
2768 {
2769         struct do_proc_douintvec_minmax_conv_param param = {
2770                 .min = (unsigned int *) table->extra1,
2771                 .max = (unsigned int *) table->extra2,
2772         };
2773         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2774                                  do_proc_douintvec_minmax_conv, &param);
2775 }
2776
2777 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2778                                         unsigned int *valp,
2779                                         int write, void *data)
2780 {
2781         if (write) {
2782                 unsigned int val;
2783
2784                 val = round_pipe_size(*lvalp);
2785                 if (val == 0)
2786                         return -EINVAL;
2787
2788                 *valp = val;
2789         } else {
2790                 unsigned int val = *valp;
2791                 *lvalp = (unsigned long) val;
2792         }
2793
2794         return 0;
2795 }
2796
2797 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2798                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2799 {
2800         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2801                                  do_proc_dopipe_max_size_conv, NULL);
2802 }
2803
2804 static void validate_coredump_safety(void)
2805 {
2806 #ifdef CONFIG_COREDUMP
2807         if (suid_dumpable == SUID_DUMP_ROOT &&
2808             core_pattern[0] != '/' && core_pattern[0] != '|') {
2809                 printk(KERN_WARNING
2810 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2811 "Pipe handler or fully qualified core dump path required.\n"
2812 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2813                 );
2814         }
2815 #endif
2816 }
2817
2818 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2819                 void __user *buffer, size_t *lenp, loff_t *ppos)
2820 {
2821         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2822         if (!error)
2823                 validate_coredump_safety();
2824         return error;
2825 }
2826
2827 #ifdef CONFIG_COREDUMP
2828 static int proc_dostring_coredump(struct ctl_table *table, int write,
2829                   void __user *buffer, size_t *lenp, loff_t *ppos)
2830 {
2831         int error = proc_dostring(table, write, buffer, lenp, ppos);
2832         if (!error)
2833                 validate_coredump_safety();
2834         return error;
2835 }
2836 #endif
2837
2838 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2839                                      void __user *buffer,
2840                                      size_t *lenp, loff_t *ppos,
2841                                      unsigned long convmul,
2842                                      unsigned long convdiv)
2843 {
2844         unsigned long *i, *min, *max;
2845         int vleft, first = 1, err = 0;
2846         size_t left;
2847         char *kbuf = NULL, *p;
2848
2849         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2850                 *lenp = 0;
2851                 return 0;
2852         }
2853
2854         i = (unsigned long *) data;
2855         min = (unsigned long *) table->extra1;
2856         max = (unsigned long *) table->extra2;
2857         vleft = table->maxlen / sizeof(unsigned long);
2858         left = *lenp;
2859
2860         if (write) {
2861                 if (proc_first_pos_non_zero_ignore(ppos, table))
2862                         goto out;
2863
2864                 if (left > PAGE_SIZE - 1)
2865                         left = PAGE_SIZE - 1;
2866                 p = kbuf = memdup_user_nul(buffer, left);
2867                 if (IS_ERR(kbuf))
2868                         return PTR_ERR(kbuf);
2869         }
2870
2871         for (; left && vleft--; i++, first = 0) {
2872                 unsigned long val;
2873
2874                 if (write) {
2875                         bool neg;
2876
2877                         left -= proc_skip_spaces(&p);
2878                         if (!left)
2879                                 break;
2880
2881                         err = proc_get_long(&p, &left, &val, &neg,
2882                                              proc_wspace_sep,
2883                                              sizeof(proc_wspace_sep), NULL);
2884                         if (err)
2885                                 break;
2886                         if (neg)
2887                                 continue;
2888                         val = convmul * val / convdiv;
2889                         if ((min && val < *min) || (max && val > *max)) {
2890                                 err = -EINVAL;
2891                                 break;
2892                         }
2893                         *i = val;
2894                 } else {
2895                         val = convdiv * (*i) / convmul;
2896                         if (!first) {
2897                                 err = proc_put_char(&buffer, &left, '\t');
2898                                 if (err)
2899                                         break;
2900                         }
2901                         err = proc_put_long(&buffer, &left, val, false);
2902                         if (err)
2903                                 break;
2904                 }
2905         }
2906
2907         if (!write && !first && left && !err)
2908                 err = proc_put_char(&buffer, &left, '\n');
2909         if (write && !err)
2910                 left -= proc_skip_spaces(&p);
2911         if (write) {
2912                 kfree(kbuf);
2913                 if (first)
2914                         return err ? : -EINVAL;
2915         }
2916         *lenp -= left;
2917 out:
2918         *ppos += *lenp;
2919         return err;
2920 }
2921
2922 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2923                                      void __user *buffer,
2924                                      size_t *lenp, loff_t *ppos,
2925                                      unsigned long convmul,
2926                                      unsigned long convdiv)
2927 {
2928         return __do_proc_doulongvec_minmax(table->data, table, write,
2929                         buffer, lenp, ppos, convmul, convdiv);
2930 }
2931
2932 /**
2933  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2934  * @table: the sysctl table
2935  * @write: %TRUE if this is a write to the sysctl file
2936  * @buffer: the user buffer
2937  * @lenp: the size of the user buffer
2938  * @ppos: file position
2939  *
2940  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2941  * values from/to the user buffer, treated as an ASCII string.
2942  *
2943  * This routine will ensure the values are within the range specified by
2944  * table->extra1 (min) and table->extra2 (max).
2945  *
2946  * Returns 0 on success.
2947  */
2948 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2949                            void __user *buffer, size_t *lenp, loff_t *ppos)
2950 {
2951     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2952 }
2953
2954 /**
2955  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2956  * @table: the sysctl table
2957  * @write: %TRUE if this is a write to the sysctl file
2958  * @buffer: the user buffer
2959  * @lenp: the size of the user buffer
2960  * @ppos: file position
2961  *
2962  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2963  * values from/to the user buffer, treated as an ASCII string. The values
2964  * are treated as milliseconds, and converted to jiffies when they are stored.
2965  *
2966  * This routine will ensure the values are within the range specified by
2967  * table->extra1 (min) and table->extra2 (max).
2968  *
2969  * Returns 0 on success.
2970  */
2971 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2972                                       void __user *buffer,
2973                                       size_t *lenp, loff_t *ppos)
2974 {
2975     return do_proc_doulongvec_minmax(table, write, buffer,
2976                                      lenp, ppos, HZ, 1000l);
2977 }
2978
2979
2980 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2981                                          int *valp,
2982                                          int write, void *data)
2983 {
2984         if (write) {
2985                 if (*lvalp > INT_MAX / HZ)
2986                         return 1;
2987                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2988         } else {
2989                 int val = *valp;
2990                 unsigned long lval;
2991                 if (val < 0) {
2992                         *negp = true;
2993                         lval = -(unsigned long)val;
2994                 } else {
2995                         *negp = false;
2996                         lval = (unsigned long)val;
2997                 }
2998                 *lvalp = lval / HZ;
2999         }
3000         return 0;
3001 }
3002
3003 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
3004                                                 int *valp,
3005                                                 int write, void *data)
3006 {
3007         if (write) {
3008                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
3009                         return 1;
3010                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
3011         } else {
3012                 int val = *valp;
3013                 unsigned long lval;
3014                 if (val < 0) {
3015                         *negp = true;
3016                         lval = -(unsigned long)val;
3017                 } else {
3018                         *negp = false;
3019                         lval = (unsigned long)val;
3020                 }
3021                 *lvalp = jiffies_to_clock_t(lval);
3022         }
3023         return 0;
3024 }
3025
3026 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
3027                                             int *valp,
3028                                             int write, void *data)
3029 {
3030         if (write) {
3031                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
3032
3033                 if (jif > INT_MAX)
3034                         return 1;
3035                 *valp = (int)jif;
3036         } else {
3037                 int val = *valp;
3038                 unsigned long lval;
3039                 if (val < 0) {
3040                         *negp = true;
3041                         lval = -(unsigned long)val;
3042                 } else {
3043                         *negp = false;
3044                         lval = (unsigned long)val;
3045                 }
3046                 *lvalp = jiffies_to_msecs(lval);
3047         }
3048         return 0;
3049 }
3050
3051 /**
3052  * proc_dointvec_jiffies - read a vector of integers as seconds
3053  * @table: the sysctl table
3054  * @write: %TRUE if this is a write to the sysctl file
3055  * @buffer: the user buffer
3056  * @lenp: the size of the user buffer
3057  * @ppos: file position
3058  *
3059  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3060  * values from/to the user buffer, treated as an ASCII string.
3061  * The values read are assumed to be in seconds, and are converted into
3062  * jiffies.
3063  *
3064  * Returns 0 on success.
3065  */
3066 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3067                           void __user *buffer, size_t *lenp, loff_t *ppos)
3068 {
3069     return do_proc_dointvec(table,write,buffer,lenp,ppos,
3070                             do_proc_dointvec_jiffies_conv,NULL);
3071 }
3072
3073 /**
3074  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3075  * @table: the sysctl table
3076  * @write: %TRUE if this is a write to the sysctl file
3077  * @buffer: the user buffer
3078  * @lenp: the size of the user buffer
3079  * @ppos: pointer to the file position
3080  *
3081  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3082  * values from/to the user buffer, treated as an ASCII string.
3083  * The values read are assumed to be in 1/USER_HZ seconds, and
3084  * are converted into jiffies.
3085  *
3086  * Returns 0 on success.
3087  */
3088 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3089                                  void __user *buffer, size_t *lenp, loff_t *ppos)
3090 {
3091     return do_proc_dointvec(table,write,buffer,lenp,ppos,
3092                             do_proc_dointvec_userhz_jiffies_conv,NULL);
3093 }
3094
3095 /**
3096  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3097  * @table: the sysctl table
3098  * @write: %TRUE if this is a write to the sysctl file
3099  * @buffer: the user buffer
3100  * @lenp: the size of the user buffer
3101  * @ppos: file position
3102  * @ppos: the current position in the file
3103  *
3104  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3105  * values from/to the user buffer, treated as an ASCII string.
3106  * The values read are assumed to be in 1/1000 seconds, and
3107  * are converted into jiffies.
3108  *
3109  * Returns 0 on success.
3110  */
3111 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3112                              void __user *buffer, size_t *lenp, loff_t *ppos)
3113 {
3114         return do_proc_dointvec(table, write, buffer, lenp, ppos,
3115                                 do_proc_dointvec_ms_jiffies_conv, NULL);
3116 }
3117
3118 static int proc_do_cad_pid(struct ctl_table *table, int write,
3119                            void __user *buffer, size_t *lenp, loff_t *ppos)
3120 {
3121         struct pid *new_pid;
3122         pid_t tmp;
3123         int r;
3124
3125         tmp = pid_vnr(cad_pid);
3126
3127         r = __do_proc_dointvec(&tmp, table, write, buffer,
3128                                lenp, ppos, NULL, NULL);
3129         if (r || !write)
3130                 return r;
3131
3132         new_pid = find_get_pid(tmp);
3133         if (!new_pid)
3134                 return -ESRCH;
3135
3136         put_pid(xchg(&cad_pid, new_pid));
3137         return 0;
3138 }
3139
3140 /**
3141  * proc_do_large_bitmap - read/write from/to a large bitmap
3142  * @table: the sysctl table
3143  * @write: %TRUE if this is a write to the sysctl file
3144  * @buffer: the user buffer
3145  * @lenp: the size of the user buffer
3146  * @ppos: file position
3147  *
3148  * The bitmap is stored at table->data and the bitmap length (in bits)
3149  * in table->maxlen.
3150  *
3151  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3152  * large bitmaps may be represented in a compact manner. Writing into
3153  * the file will clear the bitmap then update it with the given input.
3154  *
3155  * Returns 0 on success.
3156  */
3157 int proc_do_large_bitmap(struct ctl_table *table, int write,
3158                          void __user *buffer, size_t *lenp, loff_t *ppos)
3159 {
3160         int err = 0;
3161         bool first = 1;
3162         size_t left = *lenp;
3163         unsigned long bitmap_len = table->maxlen;
3164         unsigned long *bitmap = *(unsigned long **) table->data;
3165         unsigned long *tmp_bitmap = NULL;
3166         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3167
3168         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3169                 *lenp = 0;
3170                 return 0;
3171         }
3172
3173         if (write) {
3174                 char *kbuf, *p;
3175                 size_t skipped = 0;
3176
3177                 if (left > PAGE_SIZE - 1) {
3178                         left = PAGE_SIZE - 1;
3179                         /* How much of the buffer we'll skip this pass */
3180                         skipped = *lenp - left;
3181                 }
3182
3183                 p = kbuf = memdup_user_nul(buffer, left);
3184                 if (IS_ERR(kbuf))
3185                         return PTR_ERR(kbuf);
3186
3187                 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
3188                 if (!tmp_bitmap) {
3189                         kfree(kbuf);
3190                         return -ENOMEM;
3191                 }
3192                 proc_skip_char(&p, &left, '\n');
3193                 while (!err && left) {
3194                         unsigned long val_a, val_b;
3195                         bool neg;
3196                         size_t saved_left;
3197
3198                         /* In case we stop parsing mid-number, we can reset */
3199                         saved_left = left;
3200                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3201                                              sizeof(tr_a), &c);
3202                         /*
3203                          * If we consumed the entirety of a truncated buffer or
3204                          * only one char is left (may be a "-"), then stop here,
3205                          * reset, & come back for more.
3206                          */
3207                         if ((left <= 1) && skipped) {
3208                                 left = saved_left;
3209                                 break;
3210                         }
3211
3212                         if (err)
3213                                 break;
3214                         if (val_a >= bitmap_len || neg) {
3215                                 err = -EINVAL;
3216                                 break;
3217                         }
3218
3219                         val_b = val_a;
3220                         if (left) {
3221                                 p++;
3222                                 left--;
3223                         }
3224
3225                         if (c == '-') {
3226                                 err = proc_get_long(&p, &left, &val_b,
3227                                                      &neg, tr_b, sizeof(tr_b),
3228                                                      &c);
3229                                 /*
3230                                  * If we consumed all of a truncated buffer or
3231                                  * then stop here, reset, & come back for more.
3232                                  */
3233                                 if (!left && skipped) {
3234                                         left = saved_left;
3235                                         break;
3236                                 }
3237
3238                                 if (err)
3239                                         break;
3240                                 if (val_b >= bitmap_len || neg ||
3241                                     val_a > val_b) {
3242                                         err = -EINVAL;
3243                                         break;
3244                                 }
3245                                 if (left) {
3246                                         p++;
3247                                         left--;
3248                                 }
3249                         }
3250
3251                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3252                         first = 0;
3253                         proc_skip_char(&p, &left, '\n');
3254                 }
3255                 kfree(kbuf);
3256                 left += skipped;
3257         } else {
3258                 unsigned long bit_a, bit_b = 0;
3259
3260                 while (left) {
3261                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3262                         if (bit_a >= bitmap_len)
3263                                 break;
3264                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
3265                                                    bit_a + 1) - 1;
3266
3267                         if (!first) {
3268                                 err = proc_put_char(&buffer, &left, ',');
3269                                 if (err)
3270                                         break;
3271                         }
3272                         err = proc_put_long(&buffer, &left, bit_a, false);
3273                         if (err)
3274                                 break;
3275                         if (bit_a != bit_b) {
3276                                 err = proc_put_char(&buffer, &left, '-');
3277                                 if (err)
3278                                         break;
3279                                 err = proc_put_long(&buffer, &left, bit_b, false);
3280                                 if (err)
3281                                         break;
3282                         }
3283
3284                         first = 0; bit_b++;
3285                 }
3286                 if (!err)
3287                         err = proc_put_char(&buffer, &left, '\n');
3288         }
3289
3290         if (!err) {
3291                 if (write) {
3292                         if (*ppos)
3293                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3294                         else
3295                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3296                 }
3297                 *lenp -= left;
3298                 *ppos += *lenp;
3299         }
3300
3301         bitmap_free(tmp_bitmap);
3302         return err;
3303 }
3304
3305 #else /* CONFIG_PROC_SYSCTL */
3306
3307 int proc_dostring(struct ctl_table *table, int write,
3308                   void __user *buffer, size_t *lenp, loff_t *ppos)
3309 {
3310         return -ENOSYS;
3311 }
3312
3313 int proc_dointvec(struct ctl_table *table, int write,
3314                   void __user *buffer, size_t *lenp, loff_t *ppos)
3315 {
3316         return -ENOSYS;
3317 }
3318
3319 int proc_douintvec(struct ctl_table *table, int write,
3320                   void __user *buffer, size_t *lenp, loff_t *ppos)
3321 {
3322         return -ENOSYS;
3323 }
3324
3325 int proc_dointvec_minmax(struct ctl_table *table, int write,
3326                     void __user *buffer, size_t *lenp, loff_t *ppos)
3327 {
3328         return -ENOSYS;
3329 }
3330
3331 int proc_douintvec_minmax(struct ctl_table *table, int write,
3332                           void __user *buffer, size_t *lenp, loff_t *ppos)
3333 {
3334         return -ENOSYS;
3335 }
3336
3337 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3338                     void __user *buffer, size_t *lenp, loff_t *ppos)
3339 {
3340         return -ENOSYS;
3341 }
3342
3343 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3344                     void __user *buffer, size_t *lenp, loff_t *ppos)
3345 {
3346         return -ENOSYS;
3347 }
3348
3349 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3350                              void __user *buffer, size_t *lenp, loff_t *ppos)
3351 {
3352         return -ENOSYS;
3353 }
3354
3355 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3356                     void __user *buffer, size_t *lenp, loff_t *ppos)
3357 {
3358         return -ENOSYS;
3359 }
3360
3361 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3362                                       void __user *buffer,
3363                                       size_t *lenp, loff_t *ppos)
3364 {
3365     return -ENOSYS;
3366 }
3367
3368 int proc_do_large_bitmap(struct ctl_table *table, int write,
3369                          void __user *buffer, size_t *lenp, loff_t *ppos)
3370 {
3371         return -ENOSYS;
3372 }
3373
3374 #endif /* CONFIG_PROC_SYSCTL */
3375
3376 #if defined(CONFIG_SYSCTL)
3377 int proc_do_static_key(struct ctl_table *table, int write,
3378                        void __user *buffer, size_t *lenp,
3379                        loff_t *ppos)
3380 {
3381         struct static_key *key = (struct static_key *)table->data;
3382         static DEFINE_MUTEX(static_key_mutex);
3383         int val, ret;
3384         struct ctl_table tmp = {
3385                 .data   = &val,
3386                 .maxlen = sizeof(val),
3387                 .mode   = table->mode,
3388                 .extra1 = SYSCTL_ZERO,
3389                 .extra2 = SYSCTL_ONE,
3390         };
3391
3392         if (write && !capable(CAP_SYS_ADMIN))
3393                 return -EPERM;
3394
3395         mutex_lock(&static_key_mutex);
3396         val = static_key_enabled(key);
3397         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3398         if (write && !ret) {
3399                 if (val)
3400                         static_key_enable(key);
3401                 else
3402                         static_key_disable(key);
3403         }
3404         mutex_unlock(&static_key_mutex);
3405         return ret;
3406 }
3407 #endif
3408 /*
3409  * No sense putting this after each symbol definition, twice,
3410  * exception granted :-)
3411  */
3412 EXPORT_SYMBOL(proc_dointvec);
3413 EXPORT_SYMBOL(proc_douintvec);
3414 EXPORT_SYMBOL(proc_dointvec_jiffies);
3415 EXPORT_SYMBOL(proc_dointvec_minmax);
3416 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3417 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3418 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3419 EXPORT_SYMBOL(proc_dostring);
3420 EXPORT_SYMBOL(proc_doulongvec_minmax);
3421 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3422 EXPORT_SYMBOL(proc_do_large_bitmap);