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