kernel/sysctl.c

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