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