Pileus Git - ~andy/linux/blob - 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/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/bitmap.h>
  27 #include <linux/signal.h>
  28 #include <linux/printk.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/security.h>
  31 #include <linux/ctype.h>
  32 #include <linux/kmemcheck.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
  66 #include <asm/uaccess.h>
  67 #include <asm/processor.h>
  68
  69 #ifdef CONFIG_X86
  70 #include <asm/nmi.h>
  71 #include <asm/stacktrace.h>
  72 #include <asm/io.h>
  73 #endif
  74 #ifdef CONFIG_SPARC
  75 #include <asm/setup.h>
  76 #endif
  77 #ifdef CONFIG_BSD_PROCESS_ACCT
  78 #include <linux/acct.h>
  79 #endif
  80 #ifdef CONFIG_RT_MUTEXES
  81 #include <linux/rtmutex.h>
  82 #endif
  83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  84 #include <linux/lockdep.h>
  85 #endif
  86 #ifdef CONFIG_CHR_DEV_SG
  87 #include <scsi/sg.h>
  88 #endif
  89
  90 #ifdef CONFIG_LOCKUP_DETECTOR
  91 #include <linux/nmi.h>
  92 #endif
  93
  94
  95 #if defined(CONFIG_SYSCTL)
  96
  97 /* External variables not in a header file. */
  98 extern int sysctl_overcommit_memory;
  99 extern int sysctl_overcommit_ratio;
 100 extern int max_threads;
 101 extern int suid_dumpable;
 102 #ifdef CONFIG_COREDUMP
 103 extern int core_uses_pid;
 104 extern char core_pattern[];
 105 extern unsigned int core_pipe_limit;
 106 #endif
 107 extern int pid_max;
 108 extern int pid_max_min, pid_max_max;
 109 extern int percpu_pagelist_fraction;
 110 extern int compat_log;
 111 extern int latencytop_enabled;
 112 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 113 #ifndef CONFIG_MMU
 114 extern int sysctl_nr_trim_pages;
 115 #endif
 116 #ifdef CONFIG_BLOCK
 117 extern int blk_iopoll_enabled;
 118 #endif
 119
 120 /* Constants used for minimum and  maximum */
 121 #ifdef CONFIG_LOCKUP_DETECTOR
 122 static int sixty = 60;
 123 #endif
 124
 125 static int zero;
 126 static int __maybe_unused one = 1;
 127 static int __maybe_unused two = 2;
 128 static int __maybe_unused three = 3;
 129 static unsigned long one_ul = 1;
 130 static int one_hundred = 100;
 131 #ifdef CONFIG_PRINTK
 132 static int ten_thousand = 10000;
 133 #endif
 134
 135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 136 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 137
 138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 139 static int maxolduid = 65535;
 140 static int minolduid;
 141 static int min_percpu_pagelist_fract = 8;
 142
 143 static int ngroups_max = NGROUPS_MAX;
 144 static const int cap_last_cap = CAP_LAST_CAP;
 145
 146 #ifdef CONFIG_INOTIFY_USER
 147 #include <linux/inotify.h>
 148 #endif
 149 #ifdef CONFIG_SPARC
 150 #endif
 151
 152 #ifdef CONFIG_SPARC64
 153 extern int sysctl_tsb_ratio;
 154 #endif
 155
 156 #ifdef __hppa__
 157 extern int pwrsw_enabled;
 158 #endif
 159
 160 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 161 extern int unaligned_enabled;
 162 #endif
 163
 164 #ifdef CONFIG_IA64
 165 extern int unaligned_dump_stack;
 166 #endif
 167
 168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 169 extern int no_unaligned_warning;
 170 #endif
 171
 172 #ifdef CONFIG_PROC_SYSCTL
 173 static int proc_do_cad_pid(struct ctl_table *table, int write,
 174                   void __user *buffer, size_t *lenp, loff_t *ppos);
 175 static int proc_taint(struct ctl_table *table, int write,
 176                                void __user *buffer, size_t *lenp, loff_t *ppos);
 177 #endif
 178
 179 #ifdef CONFIG_PRINTK
 180 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 181                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 182 #endif
 183
 184 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 185                 void __user *buffer, size_t *lenp, loff_t *ppos);
 186 #ifdef CONFIG_COREDUMP
 187 static int proc_dostring_coredump(struct ctl_table *table, int write,
 188                 void __user *buffer, size_t *lenp, loff_t *ppos);
 189 #endif
 190
 191 #ifdef CONFIG_MAGIC_SYSRQ
 192 /* Note: sysrq code uses it's own private copy */
 193 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 194
 195 static int sysrq_sysctl_handler(ctl_table *table, int write,
 196                                 void __user *buffer, size_t *lenp,
 197                                 loff_t *ppos)
 198 {
 199         int error;
 200
 201         error = proc_dointvec(table, write, buffer, lenp, ppos);
 202         if (error)
 203                 return error;
 204
 205         if (write)
 206                 sysrq_toggle_support(__sysrq_enabled);
 207
 208         return 0;
 209 }
 210
 211 #endif
 212
 213 static struct ctl_table kern_table[];
 214 static struct ctl_table vm_table[];
 215 static struct ctl_table fs_table[];
 216 static struct ctl_table debug_table[];
 217 static struct ctl_table dev_table[];
 218 extern struct ctl_table random_table[];
 219 #ifdef CONFIG_EPOLL
 220 extern struct ctl_table epoll_table[];
 221 #endif
 222
 223 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 224 int sysctl_legacy_va_layout;
 225 #endif
 226
 227 /* The default sysctl tables: */
 228
 229 static struct ctl_table sysctl_base_table[] = {
 230         {
 231                 .procname       = "kernel",
 232                 .mode           = 0555,
 233                 .child          = kern_table,
 234         },
 235         {
 236                 .procname       = "vm",
 237                 .mode           = 0555,
 238                 .child          = vm_table,
 239         },
 240         {
 241                 .procname       = "fs",
 242                 .mode           = 0555,
 243                 .child          = fs_table,
 244         },
 245         {
 246                 .procname       = "debug",
 247                 .mode           = 0555,
 248                 .child          = debug_table,
 249         },
 250         {
 251                 .procname       = "dev",
 252                 .mode           = 0555,
 253                 .child          = dev_table,
 254         },
 255         { }
 256 };
 257
 258 #ifdef CONFIG_SCHED_DEBUG
 259 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 260 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 261 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 262 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 263 #ifdef CONFIG_SMP
 264 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 265 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 266 #endif /* CONFIG_SMP */
 267 #endif /* CONFIG_SCHED_DEBUG */
 268
 269 #ifdef CONFIG_COMPACTION
 270 static int min_extfrag_threshold;
 271 static int max_extfrag_threshold = 1000;
 272 #endif
 273
 274 static struct ctl_table kern_table[] = {
 275         {
 276                 .procname       = "sched_child_runs_first",
 277                 .data           = &sysctl_sched_child_runs_first,
 278                 .maxlen         = sizeof(unsigned int),
 279                 .mode           = 0644,
 280                 .proc_handler   = proc_dointvec,
 281         },
 282 #ifdef CONFIG_SCHED_DEBUG
 283         {
 284                 .procname       = "sched_min_granularity_ns",
 285                 .data           = &sysctl_sched_min_granularity,
 286                 .maxlen         = sizeof(unsigned int),
 287                 .mode           = 0644,
 288                 .proc_handler   = sched_proc_update_handler,
 289                 .extra1         = &min_sched_granularity_ns,
 290                 .extra2         = &max_sched_granularity_ns,
 291         },
 292         {
 293                 .procname       = "sched_latency_ns",
 294                 .data           = &sysctl_sched_latency,
 295                 .maxlen         = sizeof(unsigned int),
 296                 .mode           = 0644,
 297                 .proc_handler   = sched_proc_update_handler,
 298                 .extra1         = &min_sched_granularity_ns,
 299                 .extra2         = &max_sched_granularity_ns,
 300         },
 301         {
 302                 .procname       = "sched_wakeup_granularity_ns",
 303                 .data           = &sysctl_sched_wakeup_granularity,
 304                 .maxlen         = sizeof(unsigned int),
 305                 .mode           = 0644,
 306                 .proc_handler   = sched_proc_update_handler,
 307                 .extra1         = &min_wakeup_granularity_ns,
 308                 .extra2         = &max_wakeup_granularity_ns,
 309         },
 310 #ifdef CONFIG_SMP
 311         {
 312                 .procname       = "sched_tunable_scaling",
 313                 .data           = &sysctl_sched_tunable_scaling,
 314                 .maxlen         = sizeof(enum sched_tunable_scaling),
 315                 .mode           = 0644,
 316                 .proc_handler   = sched_proc_update_handler,
 317                 .extra1         = &min_sched_tunable_scaling,
 318                 .extra2         = &max_sched_tunable_scaling,
 319         },
 320         {
 321                 .procname       = "sched_migration_cost_ns",
 322                 .data           = &sysctl_sched_migration_cost,
 323                 .maxlen         = sizeof(unsigned int),
 324                 .mode           = 0644,
 325                 .proc_handler   = proc_dointvec,
 326         },
 327         {
 328                 .procname       = "sched_nr_migrate",
 329                 .data           = &sysctl_sched_nr_migrate,
 330                 .maxlen         = sizeof(unsigned int),
 331                 .mode           = 0644,
 332                 .proc_handler   = proc_dointvec,
 333         },
 334         {
 335                 .procname       = "sched_time_avg_ms",
 336                 .data           = &sysctl_sched_time_avg,
 337                 .maxlen         = sizeof(unsigned int),
 338                 .mode           = 0644,
 339                 .proc_handler   = proc_dointvec,
 340         },
 341         {
 342                 .procname       = "sched_shares_window_ns",
 343                 .data           = &sysctl_sched_shares_window,
 344                 .maxlen         = sizeof(unsigned int),
 345                 .mode           = 0644,
 346                 .proc_handler   = proc_dointvec,
 347         },
 348         {
 349                 .procname       = "timer_migration",
 350                 .data           = &sysctl_timer_migration,
 351                 .maxlen         = sizeof(unsigned int),
 352                 .mode           = 0644,
 353                 .proc_handler   = proc_dointvec_minmax,
 354                 .extra1         = &zero,
 355                 .extra2         = &one,
 356         },
 357 #endif /* CONFIG_SMP */
 358 #ifdef CONFIG_NUMA_BALANCING
 359         {
 360                 .procname       = "numa_balancing_scan_delay_ms",
 361                 .data           = &sysctl_numa_balancing_scan_delay,
 362                 .maxlen         = sizeof(unsigned int),
 363                 .mode           = 0644,
 364                 .proc_handler   = proc_dointvec,
 365         },
 366         {
 367                 .procname       = "numa_balancing_scan_period_min_ms",
 368                 .data           = &sysctl_numa_balancing_scan_period_min,
 369                 .maxlen         = sizeof(unsigned int),
 370                 .mode           = 0644,
 371                 .proc_handler   = proc_dointvec,
 372         },
 373         {
 374                 .procname       = "numa_balancing_scan_period_max_ms",
 375                 .data           = &sysctl_numa_balancing_scan_period_max,
 376                 .maxlen         = sizeof(unsigned int),
 377                 .mode           = 0644,
 378                 .proc_handler   = proc_dointvec,
 379         },
 380         {
 381                 .procname       = "numa_balancing_scan_size_mb",
 382                 .data           = &sysctl_numa_balancing_scan_size,
 383                 .maxlen         = sizeof(unsigned int),
 384                 .mode           = 0644,
 385                 .proc_handler   = proc_dointvec,
 386         },
 387         {
 388                 .procname       = "numa_balancing_migrate_deferred",
 389                 .data           = &sysctl_numa_balancing_migrate_deferred,
 390                 .maxlen         = sizeof(unsigned int),
 391                 .mode           = 0644,
 392                 .proc_handler   = proc_dointvec,
 393         },
 394 #endif /* CONFIG_NUMA_BALANCING */
 395 #endif /* CONFIG_SCHED_DEBUG */
 396         {
 397                 .procname       = "sched_rt_period_us",
 398                 .data           = &sysctl_sched_rt_period,
 399                 .maxlen         = sizeof(unsigned int),
 400                 .mode           = 0644,
 401                 .proc_handler   = sched_rt_handler,
 402         },
 403         {
 404                 .procname       = "sched_rt_runtime_us",
 405                 .data           = &sysctl_sched_rt_runtime,
 406                 .maxlen         = sizeof(int),
 407                 .mode           = 0644,
 408                 .proc_handler   = sched_rt_handler,
 409         },
 410         {
 411                 .procname       = "sched_rr_timeslice_ms",
 412                 .data           = &sched_rr_timeslice,
 413                 .maxlen         = sizeof(int),
 414                 .mode           = 0644,
 415                 .proc_handler   = sched_rr_handler,
 416         },
 417         {
 418                 .procname       = "sched_dl_period_us",
 419                 .data           = &sysctl_sched_dl_period,
 420                 .maxlen         = sizeof(unsigned int),
 421                 .mode           = 0644,
 422                 .proc_handler   = sched_dl_handler,
 423         },
 424         {
 425                 .procname       = "sched_dl_runtime_us",
 426                 .data           = &sysctl_sched_dl_runtime,
 427                 .maxlen         = sizeof(int),
 428                 .mode           = 0644,
 429                 .proc_handler   = sched_dl_handler,
 430         },
 431 #ifdef CONFIG_SCHED_AUTOGROUP
 432         {
 433                 .procname       = "sched_autogroup_enabled",
 434                 .data           = &sysctl_sched_autogroup_enabled,
 435                 .maxlen         = sizeof(unsigned int),
 436                 .mode           = 0644,
 437                 .proc_handler   = proc_dointvec_minmax,
 438                 .extra1         = &zero,
 439                 .extra2         = &one,
 440         },
 441 #endif
 442 #ifdef CONFIG_CFS_BANDWIDTH
 443         {
 444                 .procname       = "sched_cfs_bandwidth_slice_us",
 445                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 446                 .maxlen         = sizeof(unsigned int),
 447                 .mode           = 0644,
 448                 .proc_handler   = proc_dointvec_minmax,
 449                 .extra1         = &one,
 450         },
 451 #endif
 452 #ifdef CONFIG_PROVE_LOCKING
 453         {
 454                 .procname       = "prove_locking",
 455                 .data           = &prove_locking,
 456                 .maxlen         = sizeof(int),
 457                 .mode           = 0644,
 458                 .proc_handler   = proc_dointvec,
 459         },
 460 #endif
 461 #ifdef CONFIG_LOCK_STAT
 462         {
 463                 .procname       = "lock_stat",
 464                 .data           = &lock_stat,
 465                 .maxlen         = sizeof(int),
 466                 .mode           = 0644,
 467                 .proc_handler   = proc_dointvec,
 468         },
 469 #endif
 470         {
 471                 .procname       = "panic",
 472                 .data           = &panic_timeout,
 473                 .maxlen         = sizeof(int),
 474                 .mode           = 0644,
 475                 .proc_handler   = proc_dointvec,
 476         },
 477 #ifdef CONFIG_COREDUMP
 478         {
 479                 .procname       = "core_uses_pid",
 480                 .data           = &core_uses_pid,
 481                 .maxlen         = sizeof(int),
 482                 .mode           = 0644,
 483                 .proc_handler   = proc_dointvec,
 484         },
 485         {
 486                 .procname       = "core_pattern",
 487                 .data           = core_pattern,
 488                 .maxlen         = CORENAME_MAX_SIZE,
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dostring_coredump,
 491         },
 492         {
 493                 .procname       = "core_pipe_limit",
 494                 .data           = &core_pipe_limit,
 495                 .maxlen         = sizeof(unsigned int),
 496                 .mode           = 0644,
 497                 .proc_handler   = proc_dointvec,
 498         },
 499 #endif
 500 #ifdef CONFIG_PROC_SYSCTL
 501         {
 502                 .procname       = "tainted",
 503                 .maxlen         = sizeof(long),
 504                 .mode           = 0644,
 505                 .proc_handler   = proc_taint,
 506         },
 507 #endif
 508 #ifdef CONFIG_LATENCYTOP
 509         {
 510                 .procname       = "latencytop",
 511                 .data           = &latencytop_enabled,
 512                 .maxlen         = sizeof(int),
 513                 .mode           = 0644,
 514                 .proc_handler   = proc_dointvec,
 515         },
 516 #endif
 517 #ifdef CONFIG_BLK_DEV_INITRD
 518         {
 519                 .procname       = "real-root-dev",
 520                 .data           = &real_root_dev,
 521                 .maxlen         = sizeof(int),
 522                 .mode           = 0644,
 523                 .proc_handler   = proc_dointvec,
 524         },
 525 #endif
 526         {
 527                 .procname       = "print-fatal-signals",
 528                 .data           = &print_fatal_signals,
 529                 .maxlen         = sizeof(int),
 530                 .mode           = 0644,
 531                 .proc_handler   = proc_dointvec,
 532         },
 533 #ifdef CONFIG_SPARC
 534         {
 535                 .procname       = "reboot-cmd",
 536                 .data           = reboot_command,
 537                 .maxlen         = 256,
 538                 .mode           = 0644,
 539                 .proc_handler   = proc_dostring,
 540         },
 541         {
 542                 .procname       = "stop-a",
 543                 .data           = &stop_a_enabled,
 544                 .maxlen         = sizeof (int),
 545                 .mode           = 0644,
 546                 .proc_handler   = proc_dointvec,
 547         },
 548         {
 549                 .procname       = "scons-poweroff",
 550                 .data           = &scons_pwroff,
 551                 .maxlen         = sizeof (int),
 552                 .mode           = 0644,
 553                 .proc_handler   = proc_dointvec,
 554         },
 555 #endif
 556 #ifdef CONFIG_SPARC64
 557         {
 558                 .procname       = "tsb-ratio",
 559                 .data           = &sysctl_tsb_ratio,
 560                 .maxlen         = sizeof (int),
 561                 .mode           = 0644,
 562                 .proc_handler   = proc_dointvec,
 563         },
 564 #endif
 565 #ifdef __hppa__
 566         {
 567                 .procname       = "soft-power",
 568                 .data           = &pwrsw_enabled,
 569                 .maxlen         = sizeof (int),
 570                 .mode           = 0644,
 571                 .proc_handler   = proc_dointvec,
 572         },
 573 #endif
 574 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 575         {
 576                 .procname       = "unaligned-trap",
 577                 .data           = &unaligned_enabled,
 578                 .maxlen         = sizeof (int),
 579                 .mode           = 0644,
 580                 .proc_handler   = proc_dointvec,
 581         },
 582 #endif
 583         {
 584                 .procname       = "ctrl-alt-del",
 585                 .data           = &C_A_D,
 586                 .maxlen         = sizeof(int),
 587                 .mode           = 0644,
 588                 .proc_handler   = proc_dointvec,
 589         },
 590 #ifdef CONFIG_FUNCTION_TRACER
 591         {
 592                 .procname       = "ftrace_enabled",
 593                 .data           = &ftrace_enabled,
 594                 .maxlen         = sizeof(int),
 595                 .mode           = 0644,
 596                 .proc_handler   = ftrace_enable_sysctl,
 597         },
 598 #endif
 599 #ifdef CONFIG_STACK_TRACER
 600         {
 601                 .procname       = "stack_tracer_enabled",
 602                 .data           = &stack_tracer_enabled,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = stack_trace_sysctl,
 606         },
 607 #endif
 608 #ifdef CONFIG_TRACING
 609         {
 610                 .procname       = "ftrace_dump_on_oops",
 611                 .data           = &ftrace_dump_on_oops,
 612                 .maxlen         = sizeof(int),
 613                 .mode           = 0644,
 614                 .proc_handler   = proc_dointvec,
 615         },
 616         {
 617                 .procname       = "traceoff_on_warning",
 618                 .data           = &__disable_trace_on_warning,
 619                 .maxlen         = sizeof(__disable_trace_on_warning),
 620                 .mode           = 0644,
 621                 .proc_handler   = proc_dointvec,
 622         },
 623 #endif
 624 #ifdef CONFIG_MODULES
 625         {
 626                 .procname       = "modprobe",
 627                 .data           = &modprobe_path,
 628                 .maxlen         = KMOD_PATH_LEN,
 629                 .mode           = 0644,
 630                 .proc_handler   = proc_dostring,
 631         },
 632         {
 633                 .procname       = "modules_disabled",
 634                 .data           = &modules_disabled,
 635                 .maxlen         = sizeof(int),
 636                 .mode           = 0644,
 637                 /* only handle a transition from default "0" to "1" */
 638                 .proc_handler   = proc_dointvec_minmax,
 639                 .extra1         = &one,
 640                 .extra2         = &one,
 641         },
 642 #endif
 643
 644         {
 645                 .procname       = "hotplug",
 646                 .data           = &uevent_helper,
 647                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 648                 .mode           = 0644,
 649                 .proc_handler   = proc_dostring,
 650         },
 651
 652 #ifdef CONFIG_CHR_DEV_SG
 653         {
 654                 .procname       = "sg-big-buff",
 655                 .data           = &sg_big_buff,
 656                 .maxlen         = sizeof (int),
 657                 .mode           = 0444,
 658                 .proc_handler   = proc_dointvec,
 659         },
 660 #endif
 661 #ifdef CONFIG_BSD_PROCESS_ACCT
 662         {
 663                 .procname       = "acct",
 664                 .data           = &acct_parm,
 665                 .maxlen         = 3*sizeof(int),
 666                 .mode           = 0644,
 667                 .proc_handler   = proc_dointvec,
 668         },
 669 #endif
 670 #ifdef CONFIG_MAGIC_SYSRQ
 671         {
 672                 .procname       = "sysrq",
 673                 .data           = &__sysrq_enabled,
 674                 .maxlen         = sizeof (int),
 675                 .mode           = 0644,
 676                 .proc_handler   = sysrq_sysctl_handler,
 677         },
 678 #endif
 679 #ifdef CONFIG_PROC_SYSCTL
 680         {
 681                 .procname       = "cad_pid",
 682                 .data           = NULL,
 683                 .maxlen         = sizeof (int),
 684                 .mode           = 0600,
 685                 .proc_handler   = proc_do_cad_pid,
 686         },
 687 #endif
 688         {
 689                 .procname       = "threads-max",
 690                 .data           = &max_threads,
 691                 .maxlen         = sizeof(int),
 692                 .mode           = 0644,
 693                 .proc_handler   = proc_dointvec,
 694         },
 695         {
 696                 .procname       = "random",
 697                 .mode           = 0555,
 698                 .child          = random_table,
 699         },
 700         {
 701                 .procname       = "usermodehelper",
 702                 .mode           = 0555,
 703                 .child          = usermodehelper_table,
 704         },
 705         {
 706                 .procname       = "overflowuid",
 707                 .data           = &overflowuid,
 708                 .maxlen         = sizeof(int),
 709                 .mode           = 0644,
 710                 .proc_handler   = proc_dointvec_minmax,
 711                 .extra1         = &minolduid,
 712                 .extra2         = &maxolduid,
 713         },
 714         {
 715                 .procname       = "overflowgid",
 716                 .data           = &overflowgid,
 717                 .maxlen         = sizeof(int),
 718                 .mode           = 0644,
 719                 .proc_handler   = proc_dointvec_minmax,
 720                 .extra1         = &minolduid,
 721                 .extra2         = &maxolduid,
 722         },
 723 #ifdef CONFIG_S390
 724 #ifdef CONFIG_MATHEMU
 725         {
 726                 .procname       = "ieee_emulation_warnings",
 727                 .data           = &sysctl_ieee_emulation_warnings,
 728                 .maxlen         = sizeof(int),
 729                 .mode           = 0644,
 730                 .proc_handler   = proc_dointvec,
 731         },
 732 #endif
 733         {
 734                 .procname       = "userprocess_debug",
 735                 .data           = &show_unhandled_signals,
 736                 .maxlen         = sizeof(int),
 737                 .mode           = 0644,
 738                 .proc_handler   = proc_dointvec,
 739         },
 740 #endif
 741         {
 742                 .procname       = "pid_max",
 743                 .data           = &pid_max,
 744                 .maxlen         = sizeof (int),
 745                 .mode           = 0644,
 746                 .proc_handler   = proc_dointvec_minmax,
 747                 .extra1         = &pid_max_min,
 748                 .extra2         = &pid_max_max,
 749         },
 750         {
 751                 .procname       = "panic_on_oops",
 752                 .data           = &panic_on_oops,
 753                 .maxlen         = sizeof(int),
 754                 .mode           = 0644,
 755                 .proc_handler   = proc_dointvec,
 756         },
 757 #if defined CONFIG_PRINTK
 758         {
 759                 .procname       = "printk",
 760                 .data           = &console_loglevel,
 761                 .maxlen         = 4*sizeof(int),
 762                 .mode           = 0644,
 763                 .proc_handler   = proc_dointvec,
 764         },
 765         {
 766                 .procname       = "printk_ratelimit",
 767                 .data           = &printk_ratelimit_state.interval,
 768                 .maxlen         = sizeof(int),
 769                 .mode           = 0644,
 770                 .proc_handler   = proc_dointvec_jiffies,
 771         },
 772         {
 773                 .procname       = "printk_ratelimit_burst",
 774                 .data           = &printk_ratelimit_state.burst,
 775                 .maxlen         = sizeof(int),
 776                 .mode           = 0644,
 777                 .proc_handler   = proc_dointvec,
 778         },
 779         {
 780                 .procname       = "printk_delay",
 781                 .data           = &printk_delay_msec,
 782                 .maxlen         = sizeof(int),
 783                 .mode           = 0644,
 784                 .proc_handler   = proc_dointvec_minmax,
 785                 .extra1         = &zero,
 786                 .extra2         = &ten_thousand,
 787         },
 788         {
 789                 .procname       = "dmesg_restrict",
 790                 .data           = &dmesg_restrict,
 791                 .maxlen         = sizeof(int),
 792                 .mode           = 0644,
 793                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 794                 .extra1         = &zero,
 795                 .extra2         = &one,
 796         },
 797         {
 798                 .procname       = "kptr_restrict",
 799                 .data           = &kptr_restrict,
 800                 .maxlen         = sizeof(int),
 801                 .mode           = 0644,
 802                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 803                 .extra1         = &zero,
 804                 .extra2         = &two,
 805         },
 806 #endif
 807         {
 808                 .procname       = "ngroups_max",
 809                 .data           = &ngroups_max,
 810                 .maxlen         = sizeof (int),
 811                 .mode           = 0444,
 812                 .proc_handler   = proc_dointvec,
 813         },
 814         {
 815                 .procname       = "cap_last_cap",
 816                 .data           = (void *)&cap_last_cap,
 817                 .maxlen         = sizeof(int),
 818                 .mode           = 0444,
 819                 .proc_handler   = proc_dointvec,
 820         },
 821 #if defined(CONFIG_LOCKUP_DETECTOR)
 822         {
 823                 .procname       = "watchdog",
 824                 .data           = &watchdog_user_enabled,
 825                 .maxlen         = sizeof (int),
 826                 .mode           = 0644,
 827                 .proc_handler   = proc_dowatchdog,
 828                 .extra1         = &zero,
 829                 .extra2         = &one,
 830         },
 831         {
 832                 .procname       = "watchdog_thresh",
 833                 .data           = &watchdog_thresh,
 834                 .maxlen         = sizeof(int),
 835                 .mode           = 0644,
 836                 .proc_handler   = proc_dowatchdog,
 837                 .extra1         = &zero,
 838                 .extra2         = &sixty,
 839         },
 840         {
 841                 .procname       = "softlockup_panic",
 842                 .data           = &softlockup_panic,
 843                 .maxlen         = sizeof(int),
 844                 .mode           = 0644,
 845                 .proc_handler   = proc_dointvec_minmax,
 846                 .extra1         = &zero,
 847                 .extra2         = &one,
 848         },
 849         {
 850                 .procname       = "nmi_watchdog",
 851                 .data           = &watchdog_user_enabled,
 852                 .maxlen         = sizeof (int),
 853                 .mode           = 0644,
 854                 .proc_handler   = proc_dowatchdog,
 855                 .extra1         = &zero,
 856                 .extra2         = &one,
 857         },
 858 #endif
 859 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 860         {
 861                 .procname       = "unknown_nmi_panic",
 862                 .data           = &unknown_nmi_panic,
 863                 .maxlen         = sizeof (int),
 864                 .mode           = 0644,
 865                 .proc_handler   = proc_dointvec,
 866         },
 867 #endif
 868 #if defined(CONFIG_X86)
 869         {
 870                 .procname       = "panic_on_unrecovered_nmi",
 871                 .data           = &panic_on_unrecovered_nmi,
 872                 .maxlen         = sizeof(int),
 873                 .mode           = 0644,
 874                 .proc_handler   = proc_dointvec,
 875         },
 876         {
 877                 .procname       = "panic_on_io_nmi",
 878                 .data           = &panic_on_io_nmi,
 879                 .maxlen         = sizeof(int),
 880                 .mode           = 0644,
 881                 .proc_handler   = proc_dointvec,
 882         },
 883 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 884         {
 885                 .procname       = "panic_on_stackoverflow",
 886                 .data           = &sysctl_panic_on_stackoverflow,
 887                 .maxlen         = sizeof(int),
 888                 .mode           = 0644,
 889                 .proc_handler   = proc_dointvec,
 890         },
 891 #endif
 892         {
 893                 .procname       = "bootloader_type",
 894                 .data           = &bootloader_type,
 895                 .maxlen         = sizeof (int),
 896                 .mode           = 0444,
 897                 .proc_handler   = proc_dointvec,
 898         },
 899         {
 900                 .procname       = "bootloader_version",
 901                 .data           = &bootloader_version,
 902                 .maxlen         = sizeof (int),
 903                 .mode           = 0444,
 904                 .proc_handler   = proc_dointvec,
 905         },
 906         {
 907                 .procname       = "kstack_depth_to_print",
 908                 .data           = &kstack_depth_to_print,
 909                 .maxlen         = sizeof(int),
 910                 .mode           = 0644,
 911                 .proc_handler   = proc_dointvec,
 912         },
 913         {
 914                 .procname       = "io_delay_type",
 915                 .data           = &io_delay_type,
 916                 .maxlen         = sizeof(int),
 917                 .mode           = 0644,
 918                 .proc_handler   = proc_dointvec,
 919         },
 920 #endif
 921 #if defined(CONFIG_MMU)
 922         {
 923                 .procname       = "randomize_va_space",
 924                 .data           = &randomize_va_space,
 925                 .maxlen         = sizeof(int),
 926                 .mode           = 0644,
 927                 .proc_handler   = proc_dointvec,
 928         },
 929 #endif
 930 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 931         {
 932                 .procname       = "spin_retry",
 933                 .data           = &spin_retry,
 934                 .maxlen         = sizeof (int),
 935                 .mode           = 0644,
 936                 .proc_handler   = proc_dointvec,
 937         },
 938 #endif
 939 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 940         {
 941                 .procname       = "acpi_video_flags",
 942                 .data           = &acpi_realmode_flags,
 943                 .maxlen         = sizeof (unsigned long),
 944                 .mode           = 0644,
 945                 .proc_handler   = proc_doulongvec_minmax,
 946         },
 947 #endif
 948 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 949         {
 950                 .procname       = "ignore-unaligned-usertrap",
 951                 .data           = &no_unaligned_warning,
 952                 .maxlen         = sizeof (int),
 953                 .mode           = 0644,
 954                 .proc_handler   = proc_dointvec,
 955         },
 956 #endif
 957 #ifdef CONFIG_IA64
 958         {
 959                 .procname       = "unaligned-dump-stack",
 960                 .data           = &unaligned_dump_stack,
 961                 .maxlen         = sizeof (int),
 962                 .mode           = 0644,
 963                 .proc_handler   = proc_dointvec,
 964         },
 965 #endif
 966 #ifdef CONFIG_DETECT_HUNG_TASK
 967         {
 968                 .procname       = "hung_task_panic",
 969                 .data           = &sysctl_hung_task_panic,
 970                 .maxlen         = sizeof(int),
 971                 .mode           = 0644,
 972                 .proc_handler   = proc_dointvec_minmax,
 973                 .extra1         = &zero,
 974                 .extra2         = &one,
 975         },
 976         {
 977                 .procname       = "hung_task_check_count",
 978                 .data           = &sysctl_hung_task_check_count,
 979                 .maxlen         = sizeof(int),
 980                 .mode           = 0644,
 981                 .proc_handler   = proc_dointvec_minmax,
 982                 .extra1         = &zero,
 983         },
 984         {
 985                 .procname       = "hung_task_timeout_secs",
 986                 .data           = &sysctl_hung_task_timeout_secs,
 987                 .maxlen         = sizeof(unsigned long),
 988                 .mode           = 0644,
 989                 .proc_handler   = proc_dohung_task_timeout_secs,
 990         },
 991         {
 992                 .procname       = "hung_task_warnings",
 993                 .data           = &sysctl_hung_task_warnings,
 994                 .maxlen         = sizeof(unsigned long),
 995                 .mode           = 0644,
 996                 .proc_handler   = proc_doulongvec_minmax,
 997         },
 998 #endif
 999 #ifdef CONFIG_COMPAT
1000         {
1001                 .procname       = "compat-log",
1002                 .data           = &compat_log,
1003                 .maxlen         = sizeof (int),
1004                 .mode           = 0644,
1005                 .proc_handler   = proc_dointvec,
1006         },
1007 #endif
1008 #ifdef CONFIG_RT_MUTEXES
1009         {
1010                 .procname       = "max_lock_depth",
1011                 .data           = &max_lock_depth,
1012                 .maxlen         = sizeof(int),
1013                 .mode           = 0644,
1014                 .proc_handler   = proc_dointvec,
1015         },
1016 #endif
1017         {
1018                 .procname       = "poweroff_cmd",
1019                 .data           = &poweroff_cmd,
1020                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1021                 .mode           = 0644,
1022                 .proc_handler   = proc_dostring,
1023         },
1024 #ifdef CONFIG_KEYS
1025         {
1026                 .procname       = "keys",
1027                 .mode           = 0555,
1028                 .child          = key_sysctls,
1029         },
1030 #endif
1031 #ifdef CONFIG_RCU_TORTURE_TEST
1032         {
1033                 .procname       = "rcutorture_runnable",
1034                 .data           = &rcutorture_runnable,
1035                 .maxlen         = sizeof(int),
1036                 .mode           = 0644,
1037                 .proc_handler   = proc_dointvec,
1038         },
1039 #endif
1040 #ifdef CONFIG_PERF_EVENTS
1041         /*
1042          * User-space scripts rely on the existence of this file
1043          * as a feature check for perf_events being enabled.
1044          *
1045          * So it's an ABI, do not remove!
1046          */
1047         {
1048                 .procname       = "perf_event_paranoid",
1049                 .data           = &sysctl_perf_event_paranoid,
1050                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1051                 .mode           = 0644,
1052                 .proc_handler   = proc_dointvec,
1053         },
1054         {
1055                 .procname       = "perf_event_mlock_kb",
1056                 .data           = &sysctl_perf_event_mlock,
1057                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1058                 .mode           = 0644,
1059                 .proc_handler   = proc_dointvec,
1060         },
1061         {
1062                 .procname       = "perf_event_max_sample_rate",
1063                 .data           = &sysctl_perf_event_sample_rate,
1064                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1065                 .mode           = 0644,
1066                 .proc_handler   = perf_proc_update_handler,
1067                 .extra1         = &one,
1068         },
1069         {
1070                 .procname       = "perf_cpu_time_max_percent",
1071                 .data           = &sysctl_perf_cpu_time_max_percent,
1072                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1073                 .mode           = 0644,
1074                 .proc_handler   = perf_cpu_time_max_percent_handler,
1075                 .extra1         = &zero,
1076                 .extra2         = &one_hundred,
1077         },
1078 #endif
1079 #ifdef CONFIG_KMEMCHECK
1080         {
1081                 .procname       = "kmemcheck",
1082                 .data           = &kmemcheck_enabled,
1083                 .maxlen         = sizeof(int),
1084                 .mode           = 0644,
1085                 .proc_handler   = proc_dointvec,
1086         },
1087 #endif
1088 #ifdef CONFIG_BLOCK
1089         {
1090                 .procname       = "blk_iopoll",
1091                 .data           = &blk_iopoll_enabled,
1092                 .maxlen         = sizeof(int),
1093                 .mode           = 0644,
1094                 .proc_handler   = proc_dointvec,
1095         },
1096 #endif
1097         { }
1098 };
1099
1100 static struct ctl_table vm_table[] = {
1101         {
1102                 .procname       = "overcommit_memory",
1103                 .data           = &sysctl_overcommit_memory,
1104                 .maxlen         = sizeof(sysctl_overcommit_memory),
1105                 .mode           = 0644,
1106                 .proc_handler   = proc_dointvec_minmax,
1107                 .extra1         = &zero,
1108                 .extra2         = &two,
1109         },
1110         {
1111                 .procname       = "panic_on_oom",
1112                 .data           = &sysctl_panic_on_oom,
1113                 .maxlen         = sizeof(sysctl_panic_on_oom),
1114                 .mode           = 0644,
1115                 .proc_handler   = proc_dointvec_minmax,
1116                 .extra1         = &zero,
1117                 .extra2         = &two,
1118         },
1119         {
1120                 .procname       = "oom_kill_allocating_task",
1121                 .data           = &sysctl_oom_kill_allocating_task,
1122                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1123                 .mode           = 0644,
1124                 .proc_handler   = proc_dointvec,
1125         },
1126         {
1127                 .procname       = "oom_dump_tasks",
1128                 .data           = &sysctl_oom_dump_tasks,
1129                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dointvec,
1132         },
1133         {
1134                 .procname       = "overcommit_ratio",
1135                 .data           = &sysctl_overcommit_ratio,
1136                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1137                 .mode           = 0644,
1138                 .proc_handler   = proc_dointvec,
1139         },
1140         {
1141                 .procname       = "page-cluster",
1142                 .data           = &page_cluster,
1143                 .maxlen         = sizeof(int),
1144                 .mode           = 0644,
1145                 .proc_handler   = proc_dointvec_minmax,
1146                 .extra1         = &zero,
1147         },
1148         {
1149                 .procname       = "dirty_background_ratio",
1150                 .data           = &dirty_background_ratio,
1151                 .maxlen         = sizeof(dirty_background_ratio),
1152                 .mode           = 0644,
1153                 .proc_handler   = dirty_background_ratio_handler,
1154                 .extra1         = &zero,
1155                 .extra2         = &one_hundred,
1156         },
1157         {
1158                 .procname       = "dirty_background_bytes",
1159                 .data           = &dirty_background_bytes,
1160                 .maxlen         = sizeof(dirty_background_bytes),
1161                 .mode           = 0644,
1162                 .proc_handler   = dirty_background_bytes_handler,
1163                 .extra1         = &one_ul,
1164         },
1165         {
1166                 .procname       = "dirty_ratio",
1167                 .data           = &vm_dirty_ratio,
1168                 .maxlen         = sizeof(vm_dirty_ratio),
1169                 .mode           = 0644,
1170                 .proc_handler   = dirty_ratio_handler,
1171                 .extra1         = &zero,
1172                 .extra2         = &one_hundred,
1173         },
1174         {
1175                 .procname       = "dirty_bytes",
1176                 .data           = &vm_dirty_bytes,
1177                 .maxlen         = sizeof(vm_dirty_bytes),
1178                 .mode           = 0644,
1179                 .proc_handler   = dirty_bytes_handler,
1180                 .extra1         = &dirty_bytes_min,
1181         },
1182         {
1183                 .procname       = "dirty_writeback_centisecs",
1184                 .data           = &dirty_writeback_interval,
1185                 .maxlen         = sizeof(dirty_writeback_interval),
1186                 .mode           = 0644,
1187                 .proc_handler   = dirty_writeback_centisecs_handler,
1188         },
1189         {
1190                 .procname       = "dirty_expire_centisecs",
1191                 .data           = &dirty_expire_interval,
1192                 .maxlen         = sizeof(dirty_expire_interval),
1193                 .mode           = 0644,
1194                 .proc_handler   = proc_dointvec_minmax,
1195                 .extra1         = &zero,
1196         },
1197         {
1198                 .procname       = "nr_pdflush_threads",
1199                 .mode           = 0444 /* read-only */,
1200                 .proc_handler   = pdflush_proc_obsolete,
1201         },
1202         {
1203                 .procname       = "swappiness",
1204                 .data           = &vm_swappiness,
1205                 .maxlen         = sizeof(vm_swappiness),
1206                 .mode           = 0644,
1207                 .proc_handler   = proc_dointvec_minmax,
1208                 .extra1         = &zero,
1209                 .extra2         = &one_hundred,
1210         },
1211 #ifdef CONFIG_HUGETLB_PAGE
1212         {
1213                 .procname       = "nr_hugepages",
1214                 .data           = NULL,
1215                 .maxlen         = sizeof(unsigned long),
1216                 .mode           = 0644,
1217                 .proc_handler   = hugetlb_sysctl_handler,
1218                 .extra1         = (void *)&hugetlb_zero,
1219                 .extra2         = (void *)&hugetlb_infinity,
1220         },
1221 #ifdef CONFIG_NUMA
1222         {
1223                 .procname       = "nr_hugepages_mempolicy",
1224                 .data           = NULL,
1225                 .maxlen         = sizeof(unsigned long),
1226                 .mode           = 0644,
1227                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1228                 .extra1         = (void *)&hugetlb_zero,
1229                 .extra2         = (void *)&hugetlb_infinity,
1230         },
1231 #endif
1232          {
1233                 .procname       = "hugetlb_shm_group",
1234                 .data           = &sysctl_hugetlb_shm_group,
1235                 .maxlen         = sizeof(gid_t),
1236                 .mode           = 0644,
1237                 .proc_handler   = proc_dointvec,
1238          },
1239          {
1240                 .procname       = "hugepages_treat_as_movable",
1241                 .data           = &hugepages_treat_as_movable,
1242                 .maxlen         = sizeof(int),
1243                 .mode           = 0644,
1244                 .proc_handler   = proc_dointvec,
1245         },
1246         {
1247                 .procname       = "nr_overcommit_hugepages",
1248                 .data           = NULL,
1249                 .maxlen         = sizeof(unsigned long),
1250                 .mode           = 0644,
1251                 .proc_handler   = hugetlb_overcommit_handler,
1252                 .extra1         = (void *)&hugetlb_zero,
1253                 .extra2         = (void *)&hugetlb_infinity,
1254         },
1255 #endif
1256         {
1257                 .procname       = "lowmem_reserve_ratio",
1258                 .data           = &sysctl_lowmem_reserve_ratio,
1259                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1260                 .mode           = 0644,
1261                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1262         },
1263         {
1264                 .procname       = "drop_caches",
1265                 .data           = &sysctl_drop_caches,
1266                 .maxlen         = sizeof(int),
1267                 .mode           = 0644,
1268                 .proc_handler   = drop_caches_sysctl_handler,
1269                 .extra1         = &one,
1270                 .extra2         = &three,
1271         },
1272 #ifdef CONFIG_COMPACTION
1273         {
1274                 .procname       = "compact_memory",
1275                 .data           = &sysctl_compact_memory,
1276                 .maxlen         = sizeof(int),
1277                 .mode           = 0200,
1278                 .proc_handler   = sysctl_compaction_handler,
1279         },
1280         {
1281                 .procname       = "extfrag_threshold",
1282                 .data           = &sysctl_extfrag_threshold,
1283                 .maxlen         = sizeof(int),
1284                 .mode           = 0644,
1285                 .proc_handler   = sysctl_extfrag_handler,
1286                 .extra1         = &min_extfrag_threshold,
1287                 .extra2         = &max_extfrag_threshold,
1288         },
1289
1290 #endif /* CONFIG_COMPACTION */
1291         {
1292                 .procname       = "min_free_kbytes",
1293                 .data           = &min_free_kbytes,
1294                 .maxlen         = sizeof(min_free_kbytes),
1295                 .mode           = 0644,
1296                 .proc_handler   = min_free_kbytes_sysctl_handler,
1297                 .extra1         = &zero,
1298         },
1299         {
1300                 .procname       = "percpu_pagelist_fraction",
1301                 .data           = &percpu_pagelist_fraction,
1302                 .maxlen         = sizeof(percpu_pagelist_fraction),
1303                 .mode           = 0644,
1304                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1305                 .extra1         = &min_percpu_pagelist_fract,
1306         },
1307 #ifdef CONFIG_MMU
1308         {
1309                 .procname       = "max_map_count",
1310                 .data           = &sysctl_max_map_count,
1311                 .maxlen         = sizeof(sysctl_max_map_count),
1312                 .mode           = 0644,
1313                 .proc_handler   = proc_dointvec_minmax,
1314                 .extra1         = &zero,
1315         },
1316 #else
1317         {
1318                 .procname       = "nr_trim_pages",
1319                 .data           = &sysctl_nr_trim_pages,
1320                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1321                 .mode           = 0644,
1322                 .proc_handler   = proc_dointvec_minmax,
1323                 .extra1         = &zero,
1324         },
1325 #endif
1326         {
1327                 .procname       = "laptop_mode",
1328                 .data           = &laptop_mode,
1329                 .maxlen         = sizeof(laptop_mode),
1330                 .mode           = 0644,
1331                 .proc_handler   = proc_dointvec_jiffies,
1332         },
1333         {
1334                 .procname       = "block_dump",
1335                 .data           = &block_dump,
1336                 .maxlen         = sizeof(block_dump),
1337                 .mode           = 0644,
1338                 .proc_handler   = proc_dointvec,
1339                 .extra1         = &zero,
1340         },
1341         {
1342                 .procname       = "vfs_cache_pressure",
1343                 .data           = &sysctl_vfs_cache_pressure,
1344                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1345                 .mode           = 0644,
1346                 .proc_handler   = proc_dointvec,
1347                 .extra1         = &zero,
1348         },
1349 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1350         {
1351                 .procname       = "legacy_va_layout",
1352                 .data           = &sysctl_legacy_va_layout,
1353                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1354                 .mode           = 0644,
1355                 .proc_handler   = proc_dointvec,
1356                 .extra1         = &zero,
1357         },
1358 #endif
1359 #ifdef CONFIG_NUMA
1360         {
1361                 .procname       = "zone_reclaim_mode",
1362                 .data           = &zone_reclaim_mode,
1363                 .maxlen         = sizeof(zone_reclaim_mode),
1364                 .mode           = 0644,
1365                 .proc_handler   = proc_dointvec,
1366                 .extra1         = &zero,
1367         },
1368         {
1369                 .procname       = "min_unmapped_ratio",
1370                 .data           = &sysctl_min_unmapped_ratio,
1371                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1372                 .mode           = 0644,
1373                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1374                 .extra1         = &zero,
1375                 .extra2         = &one_hundred,
1376         },
1377         {
1378                 .procname       = "min_slab_ratio",
1379                 .data           = &sysctl_min_slab_ratio,
1380                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1381                 .mode           = 0644,
1382                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1383                 .extra1         = &zero,
1384                 .extra2         = &one_hundred,
1385         },
1386 #endif
1387 #ifdef CONFIG_SMP
1388         {
1389                 .procname       = "stat_interval",
1390                 .data           = &sysctl_stat_interval,
1391                 .maxlen         = sizeof(sysctl_stat_interval),
1392                 .mode           = 0644,
1393                 .proc_handler   = proc_dointvec_jiffies,
1394         },
1395 #endif
1396 #ifdef CONFIG_MMU
1397         {
1398                 .procname       = "mmap_min_addr",
1399                 .data           = &dac_mmap_min_addr,
1400                 .maxlen         = sizeof(unsigned long),
1401                 .mode           = 0644,
1402                 .proc_handler   = mmap_min_addr_handler,
1403         },
1404 #endif
1405 #ifdef CONFIG_NUMA
1406         {
1407                 .procname       = "numa_zonelist_order",
1408                 .data           = &numa_zonelist_order,
1409                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1410                 .mode           = 0644,
1411                 .proc_handler   = numa_zonelist_order_handler,
1412         },
1413 #endif
1414 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1415    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1416         {
1417                 .procname       = "vdso_enabled",
1418                 .data           = &vdso_enabled,
1419                 .maxlen         = sizeof(vdso_enabled),
1420                 .mode           = 0644,
1421                 .proc_handler   = proc_dointvec,
1422                 .extra1         = &zero,
1423         },
1424 #endif
1425 #ifdef CONFIG_HIGHMEM
1426         {
1427                 .procname       = "highmem_is_dirtyable",
1428                 .data           = &vm_highmem_is_dirtyable,
1429                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1430                 .mode           = 0644,
1431                 .proc_handler   = proc_dointvec_minmax,
1432                 .extra1         = &zero,
1433                 .extra2         = &one,
1434         },
1435 #endif
1436         {
1437                 .procname       = "scan_unevictable_pages",
1438                 .data           = &scan_unevictable_pages,
1439                 .maxlen         = sizeof(scan_unevictable_pages),
1440                 .mode           = 0644,
1441                 .proc_handler   = scan_unevictable_handler,
1442         },
1443 #ifdef CONFIG_MEMORY_FAILURE
1444         {
1445                 .procname       = "memory_failure_early_kill",
1446                 .data           = &sysctl_memory_failure_early_kill,
1447                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1448                 .mode           = 0644,
1449                 .proc_handler   = proc_dointvec_minmax,
1450                 .extra1         = &zero,
1451                 .extra2         = &one,
1452         },
1453         {
1454                 .procname       = "memory_failure_recovery",
1455                 .data           = &sysctl_memory_failure_recovery,
1456                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1457                 .mode           = 0644,
1458                 .proc_handler   = proc_dointvec_minmax,
1459                 .extra1         = &zero,
1460                 .extra2         = &one,
1461         },
1462 #endif
1463         {
1464                 .procname       = "user_reserve_kbytes",
1465                 .data           = &sysctl_user_reserve_kbytes,
1466                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1467                 .mode           = 0644,
1468                 .proc_handler   = proc_doulongvec_minmax,
1469         },
1470         {
1471                 .procname       = "admin_reserve_kbytes",
1472                 .data           = &sysctl_admin_reserve_kbytes,
1473                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1474                 .mode           = 0644,
1475                 .proc_handler   = proc_doulongvec_minmax,
1476         },
1477         { }
1478 };
1479
1480 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1481 static struct ctl_table binfmt_misc_table[] = {
1482         { }
1483 };
1484 #endif
1485
1486 static struct ctl_table fs_table[] = {
1487         {
1488                 .procname       = "inode-nr",
1489                 .data           = &inodes_stat,
1490                 .maxlen         = 2*sizeof(long),
1491                 .mode           = 0444,
1492                 .proc_handler   = proc_nr_inodes,
1493         },
1494         {
1495                 .procname       = "inode-state",
1496                 .data           = &inodes_stat,
1497                 .maxlen         = 7*sizeof(long),
1498                 .mode           = 0444,
1499                 .proc_handler   = proc_nr_inodes,
1500         },
1501         {
1502                 .procname       = "file-nr",
1503                 .data           = &files_stat,
1504                 .maxlen         = sizeof(files_stat),
1505                 .mode           = 0444,
1506                 .proc_handler   = proc_nr_files,
1507         },
1508         {
1509                 .procname       = "file-max",
1510                 .data           = &files_stat.max_files,
1511                 .maxlen         = sizeof(files_stat.max_files),
1512                 .mode           = 0644,
1513                 .proc_handler   = proc_doulongvec_minmax,
1514         },
1515         {
1516                 .procname       = "nr_open",
1517                 .data           = &sysctl_nr_open,
1518                 .maxlen         = sizeof(int),
1519                 .mode           = 0644,
1520                 .proc_handler   = proc_dointvec_minmax,
1521                 .extra1         = &sysctl_nr_open_min,
1522                 .extra2         = &sysctl_nr_open_max,
1523         },
1524         {
1525                 .procname       = "dentry-state",
1526                 .data           = &dentry_stat,
1527                 .maxlen         = 6*sizeof(long),
1528                 .mode           = 0444,
1529                 .proc_handler   = proc_nr_dentry,
1530         },
1531         {
1532                 .procname       = "overflowuid",
1533                 .data           = &fs_overflowuid,
1534                 .maxlen         = sizeof(int),
1535                 .mode           = 0644,
1536                 .proc_handler   = proc_dointvec_minmax,
1537                 .extra1         = &minolduid,
1538                 .extra2         = &maxolduid,
1539         },
1540         {
1541                 .procname       = "overflowgid",
1542                 .data           = &fs_overflowgid,
1543                 .maxlen         = sizeof(int),
1544                 .mode           = 0644,
1545                 .proc_handler   = proc_dointvec_minmax,
1546                 .extra1         = &minolduid,
1547                 .extra2         = &maxolduid,
1548         },
1549 #ifdef CONFIG_FILE_LOCKING
1550         {
1551                 .procname       = "leases-enable",
1552                 .data           = &leases_enable,
1553                 .maxlen         = sizeof(int),
1554                 .mode           = 0644,
1555                 .proc_handler   = proc_dointvec,
1556         },
1557 #endif
1558 #ifdef CONFIG_DNOTIFY
1559         {
1560                 .procname       = "dir-notify-enable",
1561                 .data           = &dir_notify_enable,
1562                 .maxlen         = sizeof(int),
1563                 .mode           = 0644,
1564                 .proc_handler   = proc_dointvec,
1565         },
1566 #endif
1567 #ifdef CONFIG_MMU
1568 #ifdef CONFIG_FILE_LOCKING
1569         {
1570                 .procname       = "lease-break-time",
1571                 .data           = &lease_break_time,
1572                 .maxlen         = sizeof(int),
1573                 .mode           = 0644,
1574                 .proc_handler   = proc_dointvec,
1575         },
1576 #endif
1577 #ifdef CONFIG_AIO
1578         {
1579                 .procname       = "aio-nr",
1580                 .data           = &aio_nr,
1581                 .maxlen         = sizeof(aio_nr),
1582                 .mode           = 0444,
1583                 .proc_handler   = proc_doulongvec_minmax,
1584         },
1585         {
1586                 .procname       = "aio-max-nr",
1587                 .data           = &aio_max_nr,
1588                 .maxlen         = sizeof(aio_max_nr),
1589                 .mode           = 0644,
1590                 .proc_handler   = proc_doulongvec_minmax,
1591         },
1592 #endif /* CONFIG_AIO */
1593 #ifdef CONFIG_INOTIFY_USER
1594         {
1595                 .procname       = "inotify",
1596                 .mode           = 0555,
1597                 .child          = inotify_table,
1598         },
1599 #endif
1600 #ifdef CONFIG_EPOLL
1601         {
1602                 .procname       = "epoll",
1603                 .mode           = 0555,
1604                 .child          = epoll_table,
1605         },
1606 #endif
1607 #endif
1608         {
1609                 .procname       = "protected_symlinks",
1610                 .data           = &sysctl_protected_symlinks,
1611                 .maxlen         = sizeof(int),
1612                 .mode           = 0600,
1613                 .proc_handler   = proc_dointvec_minmax,
1614                 .extra1         = &zero,
1615                 .extra2         = &one,
1616         },
1617         {
1618                 .procname       = "protected_hardlinks",
1619                 .data           = &sysctl_protected_hardlinks,
1620                 .maxlen         = sizeof(int),
1621                 .mode           = 0600,
1622                 .proc_handler   = proc_dointvec_minmax,
1623                 .extra1         = &zero,
1624                 .extra2         = &one,
1625         },
1626         {
1627                 .procname       = "suid_dumpable",
1628                 .data           = &suid_dumpable,
1629                 .maxlen         = sizeof(int),
1630                 .mode           = 0644,
1631                 .proc_handler   = proc_dointvec_minmax_coredump,
1632                 .extra1         = &zero,
1633                 .extra2         = &two,
1634         },
1635 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1636         {
1637                 .procname       = "binfmt_misc",
1638                 .mode           = 0555,
1639                 .child          = binfmt_misc_table,
1640         },
1641 #endif
1642         {
1643                 .procname       = "pipe-max-size",
1644                 .data           = &pipe_max_size,
1645                 .maxlen         = sizeof(int),
1646                 .mode           = 0644,
1647                 .proc_handler   = &pipe_proc_fn,
1648                 .extra1         = &pipe_min_size,
1649         },
1650         { }
1651 };
1652
1653 static struct ctl_table debug_table[] = {
1654 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1655         {
1656                 .procname       = "exception-trace",
1657                 .data           = &show_unhandled_signals,
1658                 .maxlen         = sizeof(int),
1659                 .mode           = 0644,
1660                 .proc_handler   = proc_dointvec
1661         },
1662 #endif
1663 #if defined(CONFIG_OPTPROBES)
1664         {
1665                 .procname       = "kprobes-optimization",
1666                 .data           = &sysctl_kprobes_optimization,
1667                 .maxlen         = sizeof(int),
1668                 .mode           = 0644,
1669                 .proc_handler   = proc_kprobes_optimization_handler,
1670                 .extra1         = &zero,
1671                 .extra2         = &one,
1672         },
1673 #endif
1674         { }
1675 };
1676
1677 static struct ctl_table dev_table[] = {
1678         { }
1679 };
1680
1681 int __init sysctl_init(void)
1682 {
1683         struct ctl_table_header *hdr;
1684
1685         hdr = register_sysctl_table(sysctl_base_table);
1686         kmemleak_not_leak(hdr);
1687         return 0;
1688 }
1689
1690 #endif /* CONFIG_SYSCTL */
1691
1692 /*
1693  * /proc/sys support
1694  */
1695
1696 #ifdef CONFIG_PROC_SYSCTL
1697
1698 static int _proc_do_string(void* data, int maxlen, int write,
1699                            void __user *buffer,
1700                            size_t *lenp, loff_t *ppos)
1701 {
1702         size_t len;
1703         char __user *p;
1704         char c;
1705
1706         if (!data || !maxlen || !*lenp) {
1707                 *lenp = 0;
1708                 return 0;
1709         }
1710
1711         if (write) {
1712                 len = 0;
1713                 p = buffer;
1714                 while (len < *lenp) {
1715                         if (get_user(c, p++))
1716                                 return -EFAULT;
1717                         if (c == 0 || c == '\n')
1718                                 break;
1719                         len++;
1720                 }
1721                 if (len >= maxlen)
1722                         len = maxlen-1;
1723                 if(copy_from_user(data, buffer, len))
1724                         return -EFAULT;
1725                 ((char *) data)[len] = 0;
1726                 *ppos += *lenp;
1727         } else {
1728                 len = strlen(data);
1729                 if (len > maxlen)
1730                         len = maxlen;
1731
1732                 if (*ppos > len) {
1733                         *lenp = 0;
1734                         return 0;
1735                 }
1736
1737                 data += *ppos;
1738                 len  -= *ppos;
1739
1740                 if (len > *lenp)
1741                         len = *lenp;
1742                 if (len)
1743                         if(copy_to_user(buffer, data, len))
1744                                 return -EFAULT;
1745                 if (len < *lenp) {
1746                         if(put_user('\n', ((char __user *) buffer) + len))
1747                                 return -EFAULT;
1748                         len++;
1749                 }
1750                 *lenp = len;
1751                 *ppos += len;
1752         }
1753         return 0;
1754 }
1755
1756 /**
1757  * proc_dostring - read a string sysctl
1758  * @table: the sysctl table
1759  * @write: %TRUE if this is a write to the sysctl file
1760  * @buffer: the user buffer
1761  * @lenp: the size of the user buffer
1762  * @ppos: file position
1763  *
1764  * Reads/writes a string from/to the user buffer. If the kernel
1765  * buffer provided is not large enough to hold the string, the
1766  * string is truncated. The copied string is %NULL-terminated.
1767  * If the string is being read by the user process, it is copied
1768  * and a newline '\n' is added. It is truncated if the buffer is
1769  * not large enough.
1770  *
1771  * Returns 0 on success.
1772  */
1773 int proc_dostring(struct ctl_table *table, int write,
1774                   void __user *buffer, size_t *lenp, loff_t *ppos)
1775 {
1776         return _proc_do_string(table->data, table->maxlen, write,
1777                                buffer, lenp, ppos);
1778 }
1779
1780 static size_t proc_skip_spaces(char **buf)
1781 {
1782         size_t ret;
1783         char *tmp = skip_spaces(*buf);
1784         ret = tmp - *buf;
1785         *buf = tmp;
1786         return ret;
1787 }
1788
1789 static void proc_skip_char(char **buf, size_t *size, const char v)
1790 {
1791         while (*size) {
1792                 if (**buf != v)
1793                         break;
1794                 (*size)--;
1795                 (*buf)++;
1796         }
1797 }
1798
1799 #define TMPBUFLEN 22
1800 /**
1801  * proc_get_long - reads an ASCII formatted integer from a user buffer
1802  *
1803  * @buf: a kernel buffer
1804  * @size: size of the kernel buffer
1805  * @val: this is where the number will be stored
1806  * @neg: set to %TRUE if number is negative
1807  * @perm_tr: a vector which contains the allowed trailers
1808  * @perm_tr_len: size of the perm_tr vector
1809  * @tr: pointer to store the trailer character
1810  *
1811  * In case of success %0 is returned and @buf and @size are updated with
1812  * the amount of bytes read. If @tr is non-NULL and a trailing
1813  * character exists (size is non-zero after returning from this
1814  * function), @tr is updated with the trailing character.
1815  */
1816 static int proc_get_long(char **buf, size_t *size,
1817                           unsigned long *val, bool *neg,
1818                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1819 {
1820         int len;
1821         char *p, tmp[TMPBUFLEN];
1822
1823         if (!*size)
1824                 return -EINVAL;
1825
1826         len = *size;
1827         if (len > TMPBUFLEN - 1)
1828                 len = TMPBUFLEN - 1;
1829
1830         memcpy(tmp, *buf, len);
1831
1832         tmp[len] = 0;
1833         p = tmp;
1834         if (*p == '-' && *size > 1) {
1835                 *neg = true;
1836                 p++;
1837         } else
1838                 *neg = false;
1839         if (!isdigit(*p))
1840                 return -EINVAL;
1841
1842         *val = simple_strtoul(p, &p, 0);
1843
1844         len = p - tmp;
1845
1846         /* We don't know if the next char is whitespace thus we may accept
1847          * invalid integers (e.g. 1234...a) or two integers instead of one
1848          * (e.g. 123...1). So lets not allow such large numbers. */
1849         if (len == TMPBUFLEN - 1)
1850                 return -EINVAL;
1851
1852         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1853                 return -EINVAL;
1854
1855         if (tr && (len < *size))
1856                 *tr = *p;
1857
1858         *buf += len;
1859         *size -= len;
1860
1861         return 0;
1862 }
1863
1864 /**
1865  * proc_put_long - converts an integer to a decimal ASCII formatted string
1866  *
1867  * @buf: the user buffer
1868  * @size: the size of the user buffer
1869  * @val: the integer to be converted
1870  * @neg: sign of the number, %TRUE for negative
1871  *
1872  * In case of success %0 is returned and @buf and @size are updated with
1873  * the amount of bytes written.
1874  */
1875 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1876                           bool neg)
1877 {
1878         int len;
1879         char tmp[TMPBUFLEN], *p = tmp;
1880
1881         sprintf(p, "%s%lu", neg ? "-" : "", val);
1882         len = strlen(tmp);
1883         if (len > *size)
1884                 len = *size;
1885         if (copy_to_user(*buf, tmp, len))
1886                 return -EFAULT;
1887         *size -= len;
1888         *buf += len;
1889         return 0;
1890 }
1891 #undef TMPBUFLEN
1892
1893 static int proc_put_char(void __user **buf, size_t *size, char c)
1894 {
1895         if (*size) {
1896                 char __user **buffer = (char __user **)buf;
1897                 if (put_user(c, *buffer))
1898                         return -EFAULT;
1899                 (*size)--, (*buffer)++;
1900                 *buf = *buffer;
1901         }
1902         return 0;
1903 }
1904
1905 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1906                                  int *valp,
1907                                  int write, void *data)
1908 {
1909         if (write) {
1910                 *valp = *negp ? -*lvalp : *lvalp;
1911         } else {
1912                 int val = *valp;
1913                 if (val < 0) {
1914                         *negp = true;
1915                         *lvalp = (unsigned long)-val;
1916                 } else {
1917                         *negp = false;
1918                         *lvalp = (unsigned long)val;
1919                 }
1920         }
1921         return 0;
1922 }
1923
1924 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1925
1926 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1927                   int write, void __user *buffer,
1928                   size_t *lenp, loff_t *ppos,
1929                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1930                               int write, void *data),
1931                   void *data)
1932 {
1933         int *i, vleft, first = 1, err = 0;
1934         unsigned long page = 0;
1935         size_t left;
1936         char *kbuf;
1937
1938         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1939                 *lenp = 0;
1940                 return 0;
1941         }
1942
1943         i = (int *) tbl_data;
1944         vleft = table->maxlen / sizeof(*i);
1945         left = *lenp;
1946
1947         if (!conv)
1948                 conv = do_proc_dointvec_conv;
1949
1950         if (write) {
1951                 if (left > PAGE_SIZE - 1)
1952                         left = PAGE_SIZE - 1;
1953                 page = __get_free_page(GFP_TEMPORARY);
1954                 kbuf = (char *) page;
1955                 if (!kbuf)
1956                         return -ENOMEM;
1957                 if (copy_from_user(kbuf, buffer, left)) {
1958                         err = -EFAULT;
1959                         goto free;
1960                 }
1961                 kbuf[left] = 0;
1962         }
1963
1964         for (; left && vleft--; i++, first=0) {
1965                 unsigned long lval;
1966                 bool neg;
1967
1968                 if (write) {
1969                         left -= proc_skip_spaces(&kbuf);
1970
1971                         if (!left)
1972                                 break;
1973                         err = proc_get_long(&kbuf, &left, &lval, &neg,
1974                                              proc_wspace_sep,
1975                                              sizeof(proc_wspace_sep), NULL);
1976                         if (err)
1977                                 break;
1978                         if (conv(&neg, &lval, i, 1, data)) {
1979                                 err = -EINVAL;
1980                                 break;
1981                         }
1982                 } else {
1983                         if (conv(&neg, &lval, i, 0, data)) {
1984                                 err = -EINVAL;
1985                                 break;
1986                         }
1987                         if (!first)
1988                                 err = proc_put_char(&buffer, &left, '\t');
1989                         if (err)
1990                                 break;
1991                         err = proc_put_long(&buffer, &left, lval, neg);
1992                         if (err)
1993                                 break;
1994                 }
1995         }
1996
1997         if (!write && !first && left && !err)
1998                 err = proc_put_char(&buffer, &left, '\n');
1999         if (write && !err && left)
2000                 left -= proc_skip_spaces(&kbuf);
2001 free:
2002         if (write) {
2003                 free_page(page);
2004                 if (first)
2005                         return err ? : -EINVAL;
2006         }
2007         *lenp -= left;
2008         *ppos += *lenp;
2009         return err;
2010 }
2011
2012 static int do_proc_dointvec(struct ctl_table *table, int write,
2013                   void __user *buffer, size_t *lenp, loff_t *ppos,
2014                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2015                               int write, void *data),
2016                   void *data)
2017 {
2018         return __do_proc_dointvec(table->data, table, write,
2019                         buffer, lenp, ppos, conv, data);
2020 }
2021
2022 /**
2023  * proc_dointvec - read a vector of integers
2024  * @table: the sysctl table
2025  * @write: %TRUE if this is a write to the sysctl file
2026  * @buffer: the user buffer
2027  * @lenp: the size of the user buffer
2028  * @ppos: file position
2029  *
2030  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2031  * values from/to the user buffer, treated as an ASCII string.
2032  *
2033  * Returns 0 on success.
2034  */
2035 int proc_dointvec(struct ctl_table *table, int write,
2036                      void __user *buffer, size_t *lenp, loff_t *ppos)
2037 {
2038     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2039                             NULL,NULL);
2040 }
2041
2042 /*
2043  * Taint values can only be increased
2044  * This means we can safely use a temporary.
2045  */
2046 static int proc_taint(struct ctl_table *table, int write,
2047                                void __user *buffer, size_t *lenp, loff_t *ppos)
2048 {
2049         struct ctl_table t;
2050         unsigned long tmptaint = get_taint();
2051         int err;
2052
2053         if (write && !capable(CAP_SYS_ADMIN))
2054                 return -EPERM;
2055
2056         t = *table;
2057         t.data = &tmptaint;
2058         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2059         if (err < 0)
2060                 return err;
2061
2062         if (write) {
2063                 /*
2064                  * Poor man's atomic or. Not worth adding a primitive
2065                  * to everyone's atomic.h for this
2066                  */
2067                 int i;
2068                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2069                         if ((tmptaint >> i) & 1)
2070                                 add_taint(i, LOCKDEP_STILL_OK);
2071                 }
2072         }
2073
2074         return err;
2075 }
2076
2077 #ifdef CONFIG_PRINTK
2078 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2079                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2080 {
2081         if (write && !capable(CAP_SYS_ADMIN))
2082                 return -EPERM;
2083
2084         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2085 }
2086 #endif
2087
2088 struct do_proc_dointvec_minmax_conv_param {
2089         int *min;
2090         int *max;
2091 };
2092
2093 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2094                                         int *valp,
2095                                         int write, void *data)
2096 {
2097         struct do_proc_dointvec_minmax_conv_param *param = data;
2098         if (write) {
2099                 int val = *negp ? -*lvalp : *lvalp;
2100                 if ((param->min && *param->min > val) ||
2101                     (param->max && *param->max < val))
2102                         return -EINVAL;
2103                 *valp = val;
2104         } else {
2105                 int val = *valp;
2106                 if (val < 0) {
2107                         *negp = true;
2108                         *lvalp = (unsigned long)-val;
2109                 } else {
2110                         *negp = false;
2111                         *lvalp = (unsigned long)val;
2112                 }
2113         }
2114         return 0;
2115 }
2116
2117 /**
2118  * proc_dointvec_minmax - read a vector of integers with min/max values
2119  * @table: the sysctl table
2120  * @write: %TRUE if this is a write to the sysctl file
2121  * @buffer: the user buffer
2122  * @lenp: the size of the user buffer
2123  * @ppos: file position
2124  *
2125  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2126  * values from/to the user buffer, treated as an ASCII string.
2127  *
2128  * This routine will ensure the values are within the range specified by
2129  * table->extra1 (min) and table->extra2 (max).
2130  *
2131  * Returns 0 on success.
2132  */
2133 int proc_dointvec_minmax(struct ctl_table *table, int write,
2134                   void __user *buffer, size_t *lenp, loff_t *ppos)
2135 {
2136         struct do_proc_dointvec_minmax_conv_param param = {
2137                 .min = (int *) table->extra1,
2138                 .max = (int *) table->extra2,
2139         };
2140         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2141                                 do_proc_dointvec_minmax_conv, &param);
2142 }
2143
2144 static void validate_coredump_safety(void)
2145 {
2146 #ifdef CONFIG_COREDUMP
2147         if (suid_dumpable == SUID_DUMP_ROOT &&
2148             core_pattern[0] != '/' && core_pattern[0] != '|') {
2149                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2150                         "suid_dumpable=2. Pipe handler or fully qualified "\
2151                         "core dump path required.\n");
2152         }
2153 #endif
2154 }
2155
2156 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2157                 void __user *buffer, size_t *lenp, loff_t *ppos)
2158 {
2159         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2160         if (!error)
2161                 validate_coredump_safety();
2162         return error;
2163 }
2164
2165 #ifdef CONFIG_COREDUMP
2166 static int proc_dostring_coredump(struct ctl_table *table, int write,
2167                   void __user *buffer, size_t *lenp, loff_t *ppos)
2168 {
2169         int error = proc_dostring(table, write, buffer, lenp, ppos);
2170         if (!error)
2171                 validate_coredump_safety();
2172         return error;
2173 }
2174 #endif
2175
2176 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2177                                      void __user *buffer,
2178                                      size_t *lenp, loff_t *ppos,
2179                                      unsigned long convmul,
2180                                      unsigned long convdiv)
2181 {
2182         unsigned long *i, *min, *max;
2183         int vleft, first = 1, err = 0;
2184         unsigned long page = 0;
2185         size_t left;
2186         char *kbuf;
2187
2188         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2189                 *lenp = 0;
2190                 return 0;
2191         }
2192
2193         i = (unsigned long *) data;
2194         min = (unsigned long *) table->extra1;
2195         max = (unsigned long *) table->extra2;
2196         vleft = table->maxlen / sizeof(unsigned long);
2197         left = *lenp;
2198
2199         if (write) {
2200                 if (left > PAGE_SIZE - 1)
2201                         left = PAGE_SIZE - 1;
2202                 page = __get_free_page(GFP_TEMPORARY);
2203                 kbuf = (char *) page;
2204                 if (!kbuf)
2205                         return -ENOMEM;
2206                 if (copy_from_user(kbuf, buffer, left)) {
2207                         err = -EFAULT;
2208                         goto free;
2209                 }
2210                 kbuf[left] = 0;
2211         }
2212
2213         for (; left && vleft--; i++, first = 0) {
2214                 unsigned long val;
2215
2216                 if (write) {
2217                         bool neg;
2218
2219                         left -= proc_skip_spaces(&kbuf);
2220
2221                         err = proc_get_long(&kbuf, &left, &val, &neg,
2222                                              proc_wspace_sep,
2223                                              sizeof(proc_wspace_sep), NULL);
2224                         if (err)
2225                                 break;
2226                         if (neg)
2227                                 continue;
2228                         if ((min && val < *min) || (max && val > *max))
2229                                 continue;
2230                         *i = val;
2231                 } else {
2232                         val = convdiv * (*i) / convmul;
2233                         if (!first) {
2234                                 err = proc_put_char(&buffer, &left, '\t');
2235                                 if (err)
2236                                         break;
2237                         }
2238                         err = proc_put_long(&buffer, &left, val, false);
2239                         if (err)
2240                                 break;
2241                 }
2242         }
2243
2244         if (!write && !first && left && !err)
2245                 err = proc_put_char(&buffer, &left, '\n');
2246         if (write && !err)
2247                 left -= proc_skip_spaces(&kbuf);
2248 free:
2249         if (write) {
2250                 free_page(page);
2251                 if (first)
2252                         return err ? : -EINVAL;
2253         }
2254         *lenp -= left;
2255         *ppos += *lenp;
2256         return err;
2257 }
2258
2259 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2260                                      void __user *buffer,
2261                                      size_t *lenp, loff_t *ppos,
2262                                      unsigned long convmul,
2263                                      unsigned long convdiv)
2264 {
2265         return __do_proc_doulongvec_minmax(table->data, table, write,
2266                         buffer, lenp, ppos, convmul, convdiv);
2267 }
2268
2269 /**
2270  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2271  * @table: the sysctl table
2272  * @write: %TRUE if this is a write to the sysctl file
2273  * @buffer: the user buffer
2274  * @lenp: the size of the user buffer
2275  * @ppos: file position
2276  *
2277  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2278  * values from/to the user buffer, treated as an ASCII string.
2279  *
2280  * This routine will ensure the values are within the range specified by
2281  * table->extra1 (min) and table->extra2 (max).
2282  *
2283  * Returns 0 on success.
2284  */
2285 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2286                            void __user *buffer, size_t *lenp, loff_t *ppos)
2287 {
2288     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2289 }
2290
2291 /**
2292  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2293  * @table: the sysctl table
2294  * @write: %TRUE if this is a write to the sysctl file
2295  * @buffer: the user buffer
2296  * @lenp: the size of the user buffer
2297  * @ppos: file position
2298  *
2299  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2300  * values from/to the user buffer, treated as an ASCII string. The values
2301  * are treated as milliseconds, and converted to jiffies when they are stored.
2302  *
2303  * This routine will ensure the values are within the range specified by
2304  * table->extra1 (min) and table->extra2 (max).
2305  *
2306  * Returns 0 on success.
2307  */
2308 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2309                                       void __user *buffer,
2310                                       size_t *lenp, loff_t *ppos)
2311 {
2312     return do_proc_doulongvec_minmax(table, write, buffer,
2313                                      lenp, ppos, HZ, 1000l);
2314 }
2315
2316
2317 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2318                                          int *valp,
2319                                          int write, void *data)
2320 {
2321         if (write) {
2322                 if (*lvalp > LONG_MAX / HZ)
2323                         return 1;
2324                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2325         } else {
2326                 int val = *valp;
2327                 unsigned long lval;
2328                 if (val < 0) {
2329                         *negp = true;
2330                         lval = (unsigned long)-val;
2331                 } else {
2332                         *negp = false;
2333                         lval = (unsigned long)val;
2334                 }
2335                 *lvalp = lval / HZ;
2336         }
2337         return 0;
2338 }
2339
2340 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2341                                                 int *valp,
2342                                                 int write, void *data)
2343 {
2344         if (write) {
2345                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2346                         return 1;
2347                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2348         } else {
2349                 int val = *valp;
2350                 unsigned long lval;
2351                 if (val < 0) {
2352                         *negp = true;
2353                         lval = (unsigned long)-val;
2354                 } else {
2355                         *negp = false;
2356                         lval = (unsigned long)val;
2357                 }
2358                 *lvalp = jiffies_to_clock_t(lval);
2359         }
2360         return 0;
2361 }
2362
2363 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2364                                             int *valp,
2365                                             int write, void *data)
2366 {
2367         if (write) {
2368                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2369
2370                 if (jif > INT_MAX)
2371                         return 1;
2372                 *valp = (int)jif;
2373         } else {
2374                 int val = *valp;
2375                 unsigned long lval;
2376                 if (val < 0) {
2377                         *negp = true;
2378                         lval = (unsigned long)-val;
2379                 } else {
2380                         *negp = false;
2381                         lval = (unsigned long)val;
2382                 }
2383                 *lvalp = jiffies_to_msecs(lval);
2384         }
2385         return 0;
2386 }
2387
2388 /**
2389  * proc_dointvec_jiffies - read a vector of integers as seconds
2390  * @table: the sysctl table
2391  * @write: %TRUE if this is a write to the sysctl file
2392  * @buffer: the user buffer
2393  * @lenp: the size of the user buffer
2394  * @ppos: file position
2395  *
2396  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2397  * values from/to the user buffer, treated as an ASCII string.
2398  * The values read are assumed to be in seconds, and are converted into
2399  * jiffies.
2400  *
2401  * Returns 0 on success.
2402  */
2403 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2404                           void __user *buffer, size_t *lenp, loff_t *ppos)
2405 {
2406     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2407                             do_proc_dointvec_jiffies_conv,NULL);
2408 }
2409
2410 /**
2411  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2412  * @table: the sysctl table
2413  * @write: %TRUE if this is a write to the sysctl file
2414  * @buffer: the user buffer
2415  * @lenp: the size of the user buffer
2416  * @ppos: pointer to the file position
2417  *
2418  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2419  * values from/to the user buffer, treated as an ASCII string.
2420  * The values read are assumed to be in 1/USER_HZ seconds, and
2421  * are converted into jiffies.
2422  *
2423  * Returns 0 on success.
2424  */
2425 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2426                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2427 {
2428     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2429                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2430 }
2431
2432 /**
2433  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2434  * @table: the sysctl table
2435  * @write: %TRUE if this is a write to the sysctl file
2436  * @buffer: the user buffer
2437  * @lenp: the size of the user buffer
2438  * @ppos: file position
2439  * @ppos: the current position in the file
2440  *
2441  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2442  * values from/to the user buffer, treated as an ASCII string.
2443  * The values read are assumed to be in 1/1000 seconds, and
2444  * are converted into jiffies.
2445  *
2446  * Returns 0 on success.
2447  */
2448 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2449                              void __user *buffer, size_t *lenp, loff_t *ppos)
2450 {
2451         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2452                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2453 }
2454
2455 static int proc_do_cad_pid(struct ctl_table *table, int write,
2456                            void __user *buffer, size_t *lenp, loff_t *ppos)
2457 {
2458         struct pid *new_pid;
2459         pid_t tmp;
2460         int r;
2461
2462         tmp = pid_vnr(cad_pid);
2463
2464         r = __do_proc_dointvec(&tmp, table, write, buffer,
2465                                lenp, ppos, NULL, NULL);
2466         if (r || !write)
2467                 return r;
2468
2469         new_pid = find_get_pid(tmp);
2470         if (!new_pid)
2471                 return -ESRCH;
2472
2473         put_pid(xchg(&cad_pid, new_pid));
2474         return 0;
2475 }
2476
2477 /**
2478  * proc_do_large_bitmap - read/write from/to a large bitmap
2479  * @table: the sysctl table
2480  * @write: %TRUE if this is a write to the sysctl file
2481  * @buffer: the user buffer
2482  * @lenp: the size of the user buffer
2483  * @ppos: file position
2484  *
2485  * The bitmap is stored at table->data and the bitmap length (in bits)
2486  * in table->maxlen.
2487  *
2488  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2489  * large bitmaps may be represented in a compact manner. Writing into
2490  * the file will clear the bitmap then update it with the given input.
2491  *
2492  * Returns 0 on success.
2493  */
2494 int proc_do_large_bitmap(struct ctl_table *table, int write,
2495                          void __user *buffer, size_t *lenp, loff_t *ppos)
2496 {
2497         int err = 0;
2498         bool first = 1;
2499         size_t left = *lenp;
2500         unsigned long bitmap_len = table->maxlen;
2501         unsigned long *bitmap = (unsigned long *) table->data;
2502         unsigned long *tmp_bitmap = NULL;
2503         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2504
2505         if (!bitmap_len || !left || (*ppos && !write)) {
2506                 *lenp = 0;
2507                 return 0;
2508         }
2509
2510         if (write) {
2511                 unsigned long page = 0;
2512                 char *kbuf;
2513
2514                 if (left > PAGE_SIZE - 1)
2515                         left = PAGE_SIZE - 1;
2516
2517                 page = __get_free_page(GFP_TEMPORARY);
2518                 kbuf = (char *) page;
2519                 if (!kbuf)
2520                         return -ENOMEM;
2521                 if (copy_from_user(kbuf, buffer, left)) {
2522                         free_page(page);
2523                         return -EFAULT;
2524                 }
2525                 kbuf[left] = 0;
2526
2527                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2528                                      GFP_KERNEL);
2529                 if (!tmp_bitmap) {
2530                         free_page(page);
2531                         return -ENOMEM;
2532                 }
2533                 proc_skip_char(&kbuf, &left, '\n');
2534                 while (!err && left) {
2535                         unsigned long val_a, val_b;
2536                         bool neg;
2537
2538                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2539                                              sizeof(tr_a), &c);
2540                         if (err)
2541                                 break;
2542                         if (val_a >= bitmap_len || neg) {
2543                                 err = -EINVAL;
2544                                 break;
2545                         }
2546
2547                         val_b = val_a;
2548                         if (left) {
2549                                 kbuf++;
2550                                 left--;
2551                         }
2552
2553                         if (c == '-') {
2554                                 err = proc_get_long(&kbuf, &left, &val_b,
2555                                                      &neg, tr_b, sizeof(tr_b),
2556                                                      &c);
2557                                 if (err)
2558                                         break;
2559                                 if (val_b >= bitmap_len || neg ||
2560                                     val_a > val_b) {
2561                                         err = -EINVAL;
2562                                         break;
2563                                 }
2564                                 if (left) {
2565                                         kbuf++;
2566                                         left--;
2567                                 }
2568                         }
2569
2570                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2571                         first = 0;
2572                         proc_skip_char(&kbuf, &left, '\n');
2573                 }
2574                 free_page(page);
2575         } else {
2576                 unsigned long bit_a, bit_b = 0;
2577
2578                 while (left) {
2579                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2580                         if (bit_a >= bitmap_len)
2581                                 break;
2582                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2583                                                    bit_a + 1) - 1;
2584
2585                         if (!first) {
2586                                 err = proc_put_char(&buffer, &left, ',');
2587                                 if (err)
2588                                         break;
2589                         }
2590                         err = proc_put_long(&buffer, &left, bit_a, false);
2591                         if (err)
2592                                 break;
2593                         if (bit_a != bit_b) {
2594                                 err = proc_put_char(&buffer, &left, '-');
2595                                 if (err)
2596                                         break;
2597                                 err = proc_put_long(&buffer, &left, bit_b, false);
2598                                 if (err)
2599                                         break;
2600                         }
2601
2602                         first = 0; bit_b++;
2603                 }
2604                 if (!err)
2605                         err = proc_put_char(&buffer, &left, '\n');
2606         }
2607
2608         if (!err) {
2609                 if (write) {
2610                         if (*ppos)
2611                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2612                         else
2613                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2614                 }
2615                 kfree(tmp_bitmap);
2616                 *lenp -= left;
2617                 *ppos += *lenp;
2618                 return 0;
2619         } else {
2620                 kfree(tmp_bitmap);
2621                 return err;
2622         }
2623 }
2624
2625 #else /* CONFIG_PROC_SYSCTL */
2626
2627 int proc_dostring(struct ctl_table *table, int write,
2628                   void __user *buffer, size_t *lenp, loff_t *ppos)
2629 {
2630         return -ENOSYS;
2631 }
2632
2633 int proc_dointvec(struct ctl_table *table, int write,
2634                   void __user *buffer, size_t *lenp, loff_t *ppos)
2635 {
2636         return -ENOSYS;
2637 }
2638
2639 int proc_dointvec_minmax(struct ctl_table *table, int write,
2640                     void __user *buffer, size_t *lenp, loff_t *ppos)
2641 {
2642         return -ENOSYS;
2643 }
2644
2645 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2646                     void __user *buffer, size_t *lenp, loff_t *ppos)
2647 {
2648         return -ENOSYS;
2649 }
2650
2651 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2652                     void __user *buffer, size_t *lenp, loff_t *ppos)
2653 {
2654         return -ENOSYS;
2655 }
2656
2657 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2658                              void __user *buffer, size_t *lenp, loff_t *ppos)
2659 {
2660         return -ENOSYS;
2661 }
2662
2663 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2664                     void __user *buffer, size_t *lenp, loff_t *ppos)
2665 {
2666         return -ENOSYS;
2667 }
2668
2669 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2670                                       void __user *buffer,
2671                                       size_t *lenp, loff_t *ppos)
2672 {
2673     return -ENOSYS;
2674 }
2675
2676
2677 #endif /* CONFIG_PROC_SYSCTL */
2678
2679 /*
2680  * No sense putting this after each symbol definition, twice,
2681  * exception granted :-)
2682  */
2683 EXPORT_SYMBOL(proc_dointvec);
2684 EXPORT_SYMBOL(proc_dointvec_jiffies);
2685 EXPORT_SYMBOL(proc_dointvec_minmax);
2686 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2687 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2688 EXPORT_SYMBOL(proc_dostring);
2689 EXPORT_SYMBOL(proc_doulongvec_minmax);
2690 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);