linux/kernel/sysctl.c
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   1/*
   2 * sysctl.c: General linux system control interface
   3 *
   4 * Begun 24 March 1995, Stephen Tweedie
   5 * Added /proc support, Dec 1995
   6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9 * Dynamic registration fixes, Stephen Tweedie.
  10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12 *  Horn.
  13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16 *  Wendling.
  17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18 *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19 */
  20
  21#include <linux/module.h>
  22#include <linux/mm.h>
  23#include <linux/swap.h>
  24#include <linux/slab.h>
  25#include <linux/sysctl.h>
  26#include <linux/bitmap.h>
  27#include <linux/signal.h>
  28#include <linux/printk.h>
  29#include <linux/proc_fs.h>
  30#include <linux/security.h>
  31#include <linux/ctype.h>
  32#include <linux/kmemcheck.h>
  33#include <linux/kmemleak.h>
  34#include <linux/fs.h>
  35#include <linux/init.h>
  36#include <linux/kernel.h>
  37#include <linux/kobject.h>
  38#include <linux/net.h>
  39#include <linux/sysrq.h>
  40#include <linux/highuid.h>
  41#include <linux/writeback.h>
  42#include <linux/ratelimit.h>
  43#include <linux/compaction.h>
  44#include <linux/hugetlb.h>
  45#include <linux/initrd.h>
  46#include <linux/key.h>
  47#include <linux/times.h>
  48#include <linux/limits.h>
  49#include <linux/dcache.h>
  50#include <linux/dnotify.h>
  51#include <linux/syscalls.h>
  52#include <linux/vmstat.h>
  53#include <linux/nfs_fs.h>
  54#include <linux/acpi.h>
  55#include <linux/reboot.h>
  56#include <linux/ftrace.h>
  57#include <linux/perf_event.h>
  58#include <linux/kprobes.h>
  59#include <linux/pipe_fs_i.h>
  60#include <linux/oom.h>
  61#include <linux/kmod.h>
  62#include <linux/capability.h>
  63#include <linux/binfmts.h>
  64#include <linux/sched/sysctl.h>
  65
  66#include <asm/uaccess.h>
  67#include <asm/processor.h>
  68
  69#ifdef CONFIG_X86
  70#include <asm/nmi.h>
  71#include <asm/stacktrace.h>
  72#include <asm/io.h>
  73#endif
  74#ifdef CONFIG_SPARC
  75#include <asm/setup.h>
  76#endif
  77#ifdef CONFIG_BSD_PROCESS_ACCT
  78#include <linux/acct.h>
  79#endif
  80#ifdef CONFIG_RT_MUTEXES
  81#include <linux/rtmutex.h>
  82#endif
  83#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  84#include <linux/lockdep.h>
  85#endif
  86#ifdef CONFIG_CHR_DEV_SG
  87#include <scsi/sg.h>
  88#endif
  89
  90#ifdef CONFIG_LOCKUP_DETECTOR
  91#include <linux/nmi.h>
  92#endif
  93
  94
  95#if defined(CONFIG_SYSCTL)
  96
  97/* External variables not in a header file. */
  98extern int sysctl_overcommit_memory;
  99extern int sysctl_overcommit_ratio;
 100extern int max_threads;
 101extern int suid_dumpable;
 102#ifdef CONFIG_COREDUMP
 103extern int core_uses_pid;
 104extern char core_pattern[];
 105extern unsigned int core_pipe_limit;
 106#endif
 107extern int pid_max;
 108extern int pid_max_min, pid_max_max;
 109extern int percpu_pagelist_fraction;
 110extern int compat_log;
 111extern int latencytop_enabled;
 112extern int sysctl_nr_open_min, sysctl_nr_open_max;
 113#ifndef CONFIG_MMU
 114extern int sysctl_nr_trim_pages;
 115#endif
 116#ifdef CONFIG_BLOCK
 117extern int blk_iopoll_enabled;
 118#endif
 119
 120/* Constants used for minimum and  maximum */
 121#ifdef CONFIG_LOCKUP_DETECTOR
 122static int sixty = 60;
 123#endif
 124
 125static int zero;
 126static int __maybe_unused one = 1;
 127static int __maybe_unused two = 2;
 128static int __maybe_unused three = 3;
 129static unsigned long one_ul = 1;
 130static int one_hundred = 100;
 131#ifdef CONFIG_PRINTK
 132static int ten_thousand = 10000;
 133#endif
 134
 135/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 136static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 137
 138/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 139static int maxolduid = 65535;
 140static int minolduid;
 141static int min_percpu_pagelist_fract = 8;
 142
 143static int ngroups_max = NGROUPS_MAX;
 144static const int cap_last_cap = CAP_LAST_CAP;
 145
 146#ifdef CONFIG_INOTIFY_USER
 147#include <linux/inotify.h>
 148#endif
 149#ifdef CONFIG_SPARC
 150#endif
 151
 152#ifdef CONFIG_SPARC64
 153extern int sysctl_tsb_ratio;
 154#endif
 155
 156#ifdef __hppa__
 157extern int pwrsw_enabled;
 158#endif
 159
 160#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 161extern int unaligned_enabled;
 162#endif
 163
 164#ifdef CONFIG_IA64
 165extern int unaligned_dump_stack;
 166#endif
 167
 168#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 169extern int no_unaligned_warning;
 170#endif
 171
 172#ifdef CONFIG_PROC_SYSCTL
 173static int proc_do_cad_pid(struct ctl_table *table, int write,
 174                  void __user *buffer, size_t *lenp, loff_t *ppos);
 175static int proc_taint(struct ctl_table *table, int write,
 176                               void __user *buffer, size_t *lenp, loff_t *ppos);
 177#endif
 178
 179#ifdef CONFIG_PRINTK
 180static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 181                                void __user *buffer, size_t *lenp, loff_t *ppos);
 182#endif
 183
 184static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 185                void __user *buffer, size_t *lenp, loff_t *ppos);
 186#ifdef CONFIG_COREDUMP
 187static int proc_dostring_coredump(struct ctl_table *table, int write,
 188                void __user *buffer, size_t *lenp, loff_t *ppos);
 189#endif
 190
 191#ifdef CONFIG_MAGIC_SYSRQ
 192/* Note: sysrq code uses it's own private copy */
 193static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
 194
 195static int sysrq_sysctl_handler(ctl_table *table, int write,
 196                                void __user *buffer, size_t *lenp,
 197                                loff_t *ppos)
 198{
 199        int error;
 200
 201        error = proc_dointvec(table, write, buffer, lenp, ppos);
 202        if (error)
 203                return error;
 204
 205        if (write)
 206                sysrq_toggle_support(__sysrq_enabled);
 207
 208        return 0;
 209}
 210
 211#endif
 212
 213static struct ctl_table kern_table[];
 214static struct ctl_table vm_table[];
 215static struct ctl_table fs_table[];
 216static struct ctl_table debug_table[];
 217static struct ctl_table dev_table[];
 218extern struct ctl_table random_table[];
 219#ifdef CONFIG_EPOLL
 220extern struct ctl_table epoll_table[];
 221#endif
 222
 223#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 224int sysctl_legacy_va_layout;
 225#endif
 226
 227/* The default sysctl tables: */
 228
 229static struct ctl_table sysctl_base_table[] = {
 230        {
 231                .procname       = "kernel",
 232                .mode           = 0555,
 233                .child          = kern_table,
 234        },
 235        {
 236                .procname       = "vm",
 237                .mode           = 0555,
 238                .child          = vm_table,
 239        },
 240        {
 241                .procname       = "fs",
 242                .mode           = 0555,
 243                .child          = fs_table,
 244        },
 245        {
 246                .procname       = "debug",
 247                .mode           = 0555,
 248                .child          = debug_table,
 249        },
 250        {
 251                .procname       = "dev",
 252                .mode           = 0555,
 253                .child          = dev_table,
 254        },
 255        { }
 256};
 257
 258#ifdef CONFIG_SCHED_DEBUG
 259static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 260static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 261static int min_wakeup_granularity_ns;                   /* 0 usecs */
 262static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 263#ifdef CONFIG_SMP
 264static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 265static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 266#endif /* CONFIG_SMP */
 267#endif /* CONFIG_SCHED_DEBUG */
 268
 269#ifdef CONFIG_COMPACTION
 270static int min_extfrag_threshold;
 271static int max_extfrag_threshold = 1000;
 272#endif
 273
 274static struct ctl_table kern_table[] = {
 275        {
 276                .procname       = "sched_child_runs_first",
 277                .data           = &sysctl_sched_child_runs_first,
 278                .maxlen         = sizeof(unsigned int),
 279                .mode           = 0644,
 280                .proc_handler   = proc_dointvec,
 281        },
 282#ifdef CONFIG_SCHED_DEBUG
 283        {
 284                .procname       = "sched_min_granularity_ns",
 285                .data           = &sysctl_sched_min_granularity,
 286                .maxlen         = sizeof(unsigned int),
 287                .mode           = 0644,
 288                .proc_handler   = sched_proc_update_handler,
 289                .extra1         = &min_sched_granularity_ns,
 290                .extra2         = &max_sched_granularity_ns,
 291        },
 292        {
 293                .procname       = "sched_latency_ns",
 294                .data           = &sysctl_sched_latency,
 295                .maxlen         = sizeof(unsigned int),
 296                .mode           = 0644,
 297                .proc_handler   = sched_proc_update_handler,
 298                .extra1         = &min_sched_granularity_ns,
 299                .extra2         = &max_sched_granularity_ns,
 300        },
 301        {
 302                .procname       = "sched_wakeup_granularity_ns",
 303                .data           = &sysctl_sched_wakeup_granularity,
 304                .maxlen         = sizeof(unsigned int),
 305                .mode           = 0644,
 306                .proc_handler   = sched_proc_update_handler,
 307                .extra1         = &min_wakeup_granularity_ns,
 308                .extra2         = &max_wakeup_granularity_ns,
 309        },
 310#ifdef CONFIG_SMP
 311        {
 312                .procname       = "sched_tunable_scaling",
 313                .data           = &sysctl_sched_tunable_scaling,
 314                .maxlen         = sizeof(enum sched_tunable_scaling),
 315                .mode           = 0644,
 316                .proc_handler   = sched_proc_update_handler,
 317                .extra1         = &min_sched_tunable_scaling,
 318                .extra2         = &max_sched_tunable_scaling,
 319        },
 320        {
 321                .procname       = "sched_migration_cost_ns",
 322                .data           = &sysctl_sched_migration_cost,
 323                .maxlen         = sizeof(unsigned int),
 324                .mode           = 0644,
 325                .proc_handler   = proc_dointvec,
 326        },
 327        {
 328                .procname       = "sched_nr_migrate",
 329                .data           = &sysctl_sched_nr_migrate,
 330                .maxlen         = sizeof(unsigned int),
 331                .mode           = 0644,
 332                .proc_handler   = proc_dointvec,
 333        },
 334        {
 335                .procname       = "sched_time_avg_ms",
 336                .data           = &sysctl_sched_time_avg,
 337                .maxlen         = sizeof(unsigned int),
 338                .mode           = 0644,
 339                .proc_handler   = proc_dointvec,
 340        },
 341        {
 342                .procname       = "sched_shares_window_ns",
 343                .data           = &sysctl_sched_shares_window,
 344                .maxlen         = sizeof(unsigned int),
 345                .mode           = 0644,
 346                .proc_handler   = proc_dointvec,
 347        },
 348        {
 349                .procname       = "timer_migration",
 350                .data           = &sysctl_timer_migration,
 351                .maxlen         = sizeof(unsigned int),
 352                .mode           = 0644,
 353                .proc_handler   = proc_dointvec_minmax,
 354                .extra1         = &zero,
 355                .extra2         = &one,
 356        },
 357#endif /* CONFIG_SMP */
 358#ifdef CONFIG_NUMA_BALANCING
 359        {
 360                .procname       = "numa_balancing_scan_delay_ms",
 361                .data           = &sysctl_numa_balancing_scan_delay,
 362                .maxlen         = sizeof(unsigned int),
 363                .mode           = 0644,
 364                .proc_handler   = proc_dointvec,
 365        },
 366        {
 367                .procname       = "numa_balancing_scan_period_min_ms",
 368                .data           = &sysctl_numa_balancing_scan_period_min,
 369                .maxlen         = sizeof(unsigned int),
 370                .mode           = 0644,
 371                .proc_handler   = proc_dointvec,
 372        },
 373        {
 374                .procname       = "numa_balancing_scan_period_reset",
 375                .data           = &sysctl_numa_balancing_scan_period_reset,
 376                .maxlen         = sizeof(unsigned int),
 377                .mode           = 0644,
 378                .proc_handler   = proc_dointvec,
 379        },
 380        {
 381                .procname       = "numa_balancing_scan_period_max_ms",
 382                .data           = &sysctl_numa_balancing_scan_period_max,
 383                .maxlen         = sizeof(unsigned int),
 384                .mode           = 0644,
 385                .proc_handler   = proc_dointvec,
 386        },
 387        {
 388                .procname       = "numa_balancing_scan_size_mb",
 389                .data           = &sysctl_numa_balancing_scan_size,
 390                .maxlen         = sizeof(unsigned int),
 391                .mode           = 0644,
 392                .proc_handler   = proc_dointvec,
 393        },
 394#endif /* CONFIG_NUMA_BALANCING */
 395#endif /* CONFIG_SCHED_DEBUG */
 396        {
 397                .procname       = "sched_rt_period_us",
 398                .data           = &sysctl_sched_rt_period,
 399                .maxlen         = sizeof(unsigned int),
 400                .mode           = 0644,
 401                .proc_handler   = sched_rt_handler,
 402        },
 403        {
 404                .procname       = "sched_rt_runtime_us",
 405                .data           = &sysctl_sched_rt_runtime,
 406                .maxlen         = sizeof(int),
 407                .mode           = 0644,
 408                .proc_handler   = sched_rt_handler,
 409        },
 410        {
 411                .procname       = "sched_rr_timeslice_ms",
 412                .data           = &sched_rr_timeslice,
 413                .maxlen         = sizeof(int),
 414                .mode           = 0644,
 415                .proc_handler   = sched_rr_handler,
 416        },
 417#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_MODULES
 611        {
 612                .procname       = "modprobe",
 613                .data           = &modprobe_path,
 614                .maxlen         = KMOD_PATH_LEN,
 615                .mode           = 0644,
 616                .proc_handler   = proc_dostring,
 617        },
 618        {
 619                .procname       = "modules_disabled",
 620                .data           = &modules_disabled,
 621                .maxlen         = sizeof(int),
 622                .mode           = 0644,
 623                /* only handle a transition from default "0" to "1" */
 624                .proc_handler   = proc_dointvec_minmax,
 625                .extra1         = &one,
 626                .extra2         = &one,
 627        },
 628#endif
 629
 630        {
 631                .procname       = "hotplug",
 632                .data           = &uevent_helper,
 633                .maxlen         = UEVENT_HELPER_PATH_LEN,
 634                .mode           = 0644,
 635                .proc_handler   = proc_dostring,
 636        },
 637
 638#ifdef CONFIG_CHR_DEV_SG
 639        {
 640                .procname       = "sg-big-buff",
 641                .data           = &sg_big_buff,
 642                .maxlen         = sizeof (int),
 643                .mode           = 0444,
 644                .proc_handler   = proc_dointvec,
 645        },
 646#endif
 647#ifdef CONFIG_BSD_PROCESS_ACCT
 648        {
 649                .procname       = "acct",
 650                .data           = &acct_parm,
 651                .maxlen         = 3*sizeof(int),
 652                .mode           = 0644,
 653                .proc_handler   = proc_dointvec,
 654        },
 655#endif
 656#ifdef CONFIG_MAGIC_SYSRQ
 657        {
 658                .procname       = "sysrq",
 659                .data           = &__sysrq_enabled,
 660                .maxlen         = sizeof (int),
 661                .mode           = 0644,
 662                .proc_handler   = sysrq_sysctl_handler,
 663        },
 664#endif
 665#ifdef CONFIG_PROC_SYSCTL
 666        {
 667                .procname       = "cad_pid",
 668                .data           = NULL,
 669                .maxlen         = sizeof (int),
 670                .mode           = 0600,
 671                .proc_handler   = proc_do_cad_pid,
 672        },
 673#endif
 674        {
 675                .procname       = "threads-max",
 676                .data           = &max_threads,
 677                .maxlen         = sizeof(int),
 678                .mode           = 0644,
 679                .proc_handler   = proc_dointvec,
 680        },
 681        {
 682                .procname       = "random",
 683                .mode           = 0555,
 684                .child          = random_table,
 685        },
 686        {
 687                .procname       = "usermodehelper",
 688                .mode           = 0555,
 689                .child          = usermodehelper_table,
 690        },
 691        {
 692                .procname       = "overflowuid",
 693                .data           = &overflowuid,
 694                .maxlen         = sizeof(int),
 695                .mode           = 0644,
 696                .proc_handler   = proc_dointvec_minmax,
 697                .extra1         = &minolduid,
 698                .extra2         = &maxolduid,
 699        },
 700        {
 701                .procname       = "overflowgid",
 702                .data           = &overflowgid,
 703                .maxlen         = sizeof(int),
 704                .mode           = 0644,
 705                .proc_handler   = proc_dointvec_minmax,
 706                .extra1         = &minolduid,
 707                .extra2         = &maxolduid,
 708        },
 709#ifdef CONFIG_S390
 710#ifdef CONFIG_MATHEMU
 711        {
 712                .procname       = "ieee_emulation_warnings",
 713                .data           = &sysctl_ieee_emulation_warnings,
 714                .maxlen         = sizeof(int),
 715                .mode           = 0644,
 716                .proc_handler   = proc_dointvec,
 717        },
 718#endif
 719        {
 720                .procname       = "userprocess_debug",
 721                .data           = &show_unhandled_signals,
 722                .maxlen         = sizeof(int),
 723                .mode           = 0644,
 724                .proc_handler   = proc_dointvec,
 725        },
 726#endif
 727        {
 728                .procname       = "pid_max",
 729                .data           = &pid_max,
 730                .maxlen         = sizeof (int),
 731                .mode           = 0644,
 732                .proc_handler   = proc_dointvec_minmax,
 733                .extra1         = &pid_max_min,
 734                .extra2         = &pid_max_max,
 735        },
 736        {
 737                .procname       = "panic_on_oops",
 738                .data           = &panic_on_oops,
 739                .maxlen         = sizeof(int),
 740                .mode           = 0644,
 741                .proc_handler   = proc_dointvec,
 742        },
 743#if defined CONFIG_PRINTK
 744        {
 745                .procname       = "printk",
 746                .data           = &console_loglevel,
 747                .maxlen         = 4*sizeof(int),
 748                .mode           = 0644,
 749                .proc_handler   = proc_dointvec,
 750        },
 751        {
 752                .procname       = "printk_ratelimit",
 753                .data           = &printk_ratelimit_state.interval,
 754                .maxlen         = sizeof(int),
 755                .mode           = 0644,
 756                .proc_handler   = proc_dointvec_jiffies,
 757        },
 758        {
 759                .procname       = "printk_ratelimit_burst",
 760                .data           = &printk_ratelimit_state.burst,
 761                .maxlen         = sizeof(int),
 762                .mode           = 0644,
 763                .proc_handler   = proc_dointvec,
 764        },
 765        {
 766                .procname       = "printk_delay",
 767                .data           = &printk_delay_msec,
 768                .maxlen         = sizeof(int),
 769                .mode           = 0644,
 770                .proc_handler   = proc_dointvec_minmax,
 771                .extra1         = &zero,
 772                .extra2         = &ten_thousand,
 773        },
 774        {
 775                .procname       = "dmesg_restrict",
 776                .data           = &dmesg_restrict,
 777                .maxlen         = sizeof(int),
 778                .mode           = 0644,
 779                .proc_handler   = proc_dointvec_minmax_sysadmin,
 780                .extra1         = &zero,
 781                .extra2         = &one,
 782        },
 783        {
 784                .procname       = "kptr_restrict",
 785                .data           = &kptr_restrict,
 786                .maxlen         = sizeof(int),
 787                .mode           = 0644,
 788                .proc_handler   = proc_dointvec_minmax_sysadmin,
 789                .extra1         = &zero,
 790                .extra2         = &two,
 791        },
 792#endif
 793        {
 794                .procname       = "ngroups_max",
 795                .data           = &ngroups_max,
 796                .maxlen         = sizeof (int),
 797                .mode           = 0444,
 798                .proc_handler   = proc_dointvec,
 799        },
 800        {
 801                .procname       = "cap_last_cap",
 802                .data           = (void *)&cap_last_cap,
 803                .maxlen         = sizeof(int),
 804                .mode           = 0444,
 805                .proc_handler   = proc_dointvec,
 806        },
 807#if defined(CONFIG_LOCKUP_DETECTOR)
 808        {
 809                .procname       = "watchdog",
 810                .data           = &watchdog_user_enabled,
 811                .maxlen         = sizeof (int),
 812                .mode           = 0644,
 813                .proc_handler   = proc_dowatchdog,
 814                .extra1         = &zero,
 815                .extra2         = &one,
 816        },
 817        {
 818                .procname       = "watchdog_thresh",
 819                .data           = &watchdog_thresh,
 820                .maxlen         = sizeof(int),
 821                .mode           = 0644,
 822                .proc_handler   = proc_dowatchdog,
 823                .extra1         = &zero,
 824                .extra2         = &sixty,
 825        },
 826        {
 827                .procname       = "softlockup_panic",
 828                .data           = &softlockup_panic,
 829                .maxlen         = sizeof(int),
 830                .mode           = 0644,
 831                .proc_handler   = proc_dointvec_minmax,
 832                .extra1         = &zero,
 833                .extra2         = &one,
 834        },
 835        {
 836                .procname       = "nmi_watchdog",
 837                .data           = &watchdog_user_enabled,
 838                .maxlen         = sizeof (int),
 839                .mode           = 0644,
 840                .proc_handler   = proc_dowatchdog,
 841                .extra1         = &zero,
 842                .extra2         = &one,
 843        },
 844#endif
 845#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 846        {
 847                .procname       = "unknown_nmi_panic",
 848                .data           = &unknown_nmi_panic,
 849                .maxlen         = sizeof (int),
 850                .mode           = 0644,
 851                .proc_handler   = proc_dointvec,
 852        },
 853#endif
 854#if defined(CONFIG_X86)
 855        {
 856                .procname       = "panic_on_unrecovered_nmi",
 857                .data           = &panic_on_unrecovered_nmi,
 858                .maxlen         = sizeof(int),
 859                .mode           = 0644,
 860                .proc_handler   = proc_dointvec,
 861        },
 862        {
 863                .procname       = "panic_on_io_nmi",
 864                .data           = &panic_on_io_nmi,
 865                .maxlen         = sizeof(int),
 866                .mode           = 0644,
 867                .proc_handler   = proc_dointvec,
 868        },
 869#ifdef CONFIG_DEBUG_STACKOVERFLOW
 870        {
 871                .procname       = "panic_on_stackoverflow",
 872                .data           = &sysctl_panic_on_stackoverflow,
 873                .maxlen         = sizeof(int),
 874                .mode           = 0644,
 875                .proc_handler   = proc_dointvec,
 876        },
 877#endif
 878        {
 879                .procname       = "bootloader_type",
 880                .data           = &bootloader_type,
 881                .maxlen         = sizeof (int),
 882                .mode           = 0444,
 883                .proc_handler   = proc_dointvec,
 884        },
 885        {
 886                .procname       = "bootloader_version",
 887                .data           = &bootloader_version,
 888                .maxlen         = sizeof (int),
 889                .mode           = 0444,
 890                .proc_handler   = proc_dointvec,
 891        },
 892        {
 893                .procname       = "kstack_depth_to_print",
 894                .data           = &kstack_depth_to_print,
 895                .maxlen         = sizeof(int),
 896                .mode           = 0644,
 897                .proc_handler   = proc_dointvec,
 898        },
 899        {
 900                .procname       = "io_delay_type",
 901                .data           = &io_delay_type,
 902                .maxlen         = sizeof(int),
 903                .mode           = 0644,
 904                .proc_handler   = proc_dointvec,
 905        },
 906#endif
 907#if defined(CONFIG_MMU)
 908        {
 909                .procname       = "randomize_va_space",
 910                .data           = &randomize_va_space,
 911                .maxlen         = sizeof(int),
 912                .mode           = 0644,
 913                .proc_handler   = proc_dointvec,
 914        },
 915#endif
 916#if defined(CONFIG_S390) && defined(CONFIG_SMP)
 917        {
 918                .procname       = "spin_retry",
 919                .data           = &spin_retry,
 920                .maxlen         = sizeof (int),
 921                .mode           = 0644,
 922                .proc_handler   = proc_dointvec,
 923        },
 924#endif
 925#if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 926        {
 927                .procname       = "acpi_video_flags",
 928                .data           = &acpi_realmode_flags,
 929                .maxlen         = sizeof (unsigned long),
 930                .mode           = 0644,
 931                .proc_handler   = proc_doulongvec_minmax,
 932        },
 933#endif
 934#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 935        {
 936                .procname       = "ignore-unaligned-usertrap",
 937                .data           = &no_unaligned_warning,
 938                .maxlen         = sizeof (int),
 939                .mode           = 0644,
 940                .proc_handler   = proc_dointvec,
 941        },
 942#endif
 943#ifdef CONFIG_IA64
 944        {
 945                .procname       = "unaligned-dump-stack",
 946                .data           = &unaligned_dump_stack,
 947                .maxlen         = sizeof (int),
 948                .mode           = 0644,
 949                .proc_handler   = proc_dointvec,
 950        },
 951#endif
 952#ifdef CONFIG_DETECT_HUNG_TASK
 953        {
 954                .procname       = "hung_task_panic",
 955                .data           = &sysctl_hung_task_panic,
 956                .maxlen         = sizeof(int),
 957                .mode           = 0644,
 958                .proc_handler   = proc_dointvec_minmax,
 959                .extra1         = &zero,
 960                .extra2         = &one,
 961        },
 962        {
 963                .procname       = "hung_task_check_count",
 964                .data           = &sysctl_hung_task_check_count,
 965                .maxlen         = sizeof(unsigned long),
 966                .mode           = 0644,
 967                .proc_handler   = proc_doulongvec_minmax,
 968        },
 969        {
 970                .procname       = "hung_task_timeout_secs",
 971                .data           = &sysctl_hung_task_timeout_secs,
 972                .maxlen         = sizeof(unsigned long),
 973                .mode           = 0644,
 974                .proc_handler   = proc_dohung_task_timeout_secs,
 975        },
 976        {
 977                .procname       = "hung_task_warnings",
 978                .data           = &sysctl_hung_task_warnings,
 979                .maxlen         = sizeof(unsigned long),
 980                .mode           = 0644,
 981                .proc_handler   = proc_doulongvec_minmax,
 982        },
 983#endif
 984#ifdef CONFIG_COMPAT
 985        {
 986                .procname       = "compat-log",
 987                .data           = &compat_log,
 988                .maxlen         = sizeof (int),
 989                .mode           = 0644,
 990                .proc_handler   = proc_dointvec,
 991        },
 992#endif
 993#ifdef CONFIG_RT_MUTEXES
 994        {
 995                .procname       = "max_lock_depth",
 996                .data           = &max_lock_depth,
 997                .maxlen         = sizeof(int),
 998                .mode           = 0644,
 999                .proc_handler   = proc_dointvec,
1000        },
1001#endif
1002        {
1003                .procname       = "poweroff_cmd",
1004                .data           = &poweroff_cmd,
1005                .maxlen         = POWEROFF_CMD_PATH_LEN,
1006                .mode           = 0644,
1007                .proc_handler   = proc_dostring,
1008        },
1009#ifdef CONFIG_KEYS
1010        {
1011                .procname       = "keys",
1012                .mode           = 0555,
1013                .child          = key_sysctls,
1014        },
1015#endif
1016#ifdef CONFIG_RCU_TORTURE_TEST
1017        {
1018                .procname       = "rcutorture_runnable",
1019                .data           = &rcutorture_runnable,
1020                .maxlen         = sizeof(int),
1021                .mode           = 0644,
1022                .proc_handler   = proc_dointvec,
1023        },
1024#endif
1025#ifdef CONFIG_PERF_EVENTS
1026        /*
1027         * User-space scripts rely on the existence of this file
1028         * as a feature check for perf_events being enabled.
1029         *
1030         * So it's an ABI, do not remove!
1031         */
1032        {
1033                .procname       = "perf_event_paranoid",
1034                .data           = &sysctl_perf_event_paranoid,
1035                .maxlen         = sizeof(sysctl_perf_event_paranoid),
1036                .mode           = 0644,
1037                .proc_handler   = proc_dointvec,
1038        },
1039        {
1040                .procname       = "perf_event_mlock_kb",
1041                .data           = &sysctl_perf_event_mlock,
1042                .maxlen         = sizeof(sysctl_perf_event_mlock),
1043                .mode           = 0644,
1044                .proc_handler   = proc_dointvec,
1045        },
1046        {
1047                .procname       = "perf_event_max_sample_rate",
1048                .data           = &sysctl_perf_event_sample_rate,
1049                .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1050                .mode           = 0644,
1051                .proc_handler   = perf_proc_update_handler,
1052        },
1053        {
1054                .procname       = "perf_cpu_time_max_percent",
1055                .data           = &sysctl_perf_cpu_time_max_percent,
1056                .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1057                .mode           = 0644,
1058                .proc_handler   = perf_cpu_time_max_percent_handler,
1059                .extra1         = &zero,
1060                .extra2         = &one_hundred,
1061        },
1062#endif
1063#ifdef CONFIG_KMEMCHECK
1064        {
1065                .procname       = "kmemcheck",
1066                .data           = &kmemcheck_enabled,
1067                .maxlen         = sizeof(int),
1068                .mode           = 0644,
1069                .proc_handler   = proc_dointvec,
1070        },
1071#endif
1072#ifdef CONFIG_BLOCK
1073        {
1074                .procname       = "blk_iopoll",
1075                .data           = &blk_iopoll_enabled,
1076                .maxlen         = sizeof(int),
1077                .mode           = 0644,
1078                .proc_handler   = proc_dointvec,
1079        },
1080#endif
1081        { }
1082};
1083
1084static struct ctl_table vm_table[] = {
1085        {
1086                .procname       = "overcommit_memory",
1087                .data           = &sysctl_overcommit_memory,
1088                .maxlen         = sizeof(sysctl_overcommit_memory),
1089                .mode           = 0644,
1090                .proc_handler   = proc_dointvec_minmax,
1091                .extra1         = &zero,
1092                .extra2         = &two,
1093        },
1094        {
1095                .procname       = "panic_on_oom",
1096                .data           = &sysctl_panic_on_oom,
1097                .maxlen         = sizeof(sysctl_panic_on_oom),
1098                .mode           = 0644,
1099                .proc_handler   = proc_dointvec_minmax,
1100                .extra1         = &zero,
1101                .extra2         = &two,
1102        },
1103        {
1104                .procname       = "oom_kill_allocating_task",
1105                .data           = &sysctl_oom_kill_allocating_task,
1106                .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1107                .mode           = 0644,
1108                .proc_handler   = proc_dointvec,
1109        },
1110        {
1111                .procname       = "oom_dump_tasks",
1112                .data           = &sysctl_oom_dump_tasks,
1113                .maxlen         = sizeof(sysctl_oom_dump_tasks),
1114                .mode           = 0644,
1115                .proc_handler   = proc_dointvec,
1116        },
1117        {
1118                .procname       = "overcommit_ratio",
1119                .data           = &sysctl_overcommit_ratio,
1120                .maxlen         = sizeof(sysctl_overcommit_ratio),
1121                .mode           = 0644,
1122                .proc_handler   = proc_dointvec,
1123        },
1124        {
1125                .procname       = "page-cluster", 
1126                .data           = &page_cluster,
1127                .maxlen         = sizeof(int),
1128                .mode           = 0644,
1129                .proc_handler   = proc_dointvec_minmax,
1130                .extra1         = &zero,
1131        },
1132        {
1133                .procname       = "dirty_background_ratio",
1134                .data           = &dirty_background_ratio,
1135                .maxlen         = sizeof(dirty_background_ratio),
1136                .mode           = 0644,
1137                .proc_handler   = dirty_background_ratio_handler,
1138                .extra1         = &zero,
1139                .extra2         = &one_hundred,
1140        },
1141        {
1142                .procname       = "dirty_background_bytes",
1143                .data           = &dirty_background_bytes,
1144                .maxlen         = sizeof(dirty_background_bytes),
1145                .mode           = 0644,
1146                .proc_handler   = dirty_background_bytes_handler,
1147                .extra1         = &one_ul,
1148        },
1149        {
1150                .procname       = "dirty_ratio",
1151                .data           = &vm_dirty_ratio,
1152                .maxlen         = sizeof(vm_dirty_ratio),
1153                .mode           = 0644,
1154                .proc_handler   = dirty_ratio_handler,
1155                .extra1         = &zero,
1156                .extra2         = &one_hundred,
1157        },
1158        {
1159                .procname       = "dirty_bytes",
1160                .data           = &vm_dirty_bytes,
1161                .maxlen         = sizeof(vm_dirty_bytes),
1162                .mode           = 0644,
1163                .proc_handler   = dirty_bytes_handler,
1164                .extra1         = &dirty_bytes_min,
1165        },
1166        {
1167                .procname       = "dirty_writeback_centisecs",
1168                .data           = &dirty_writeback_interval,
1169                .maxlen         = sizeof(dirty_writeback_interval),
1170                .mode           = 0644,
1171                .proc_handler   = dirty_writeback_centisecs_handler,
1172        },
1173        {
1174                .procname       = "dirty_expire_centisecs",
1175                .data           = &dirty_expire_interval,
1176                .maxlen         = sizeof(dirty_expire_interval),
1177                .mode           = 0644,
1178                .proc_handler   = proc_dointvec_minmax,
1179                .extra1         = &zero,
1180        },
1181        {
1182                .procname       = "nr_pdflush_threads",
1183                .mode           = 0444 /* read-only */,
1184                .proc_handler   = pdflush_proc_obsolete,
1185        },
1186        {
1187                .procname       = "swappiness",
1188                .data           = &vm_swappiness,
1189                .maxlen         = sizeof(vm_swappiness),
1190                .mode           = 0644,
1191                .proc_handler   = proc_dointvec_minmax,
1192                .extra1         = &zero,
1193                .extra2         = &one_hundred,
1194        },
1195#ifdef CONFIG_HUGETLB_PAGE
1196        {
1197                .procname       = "nr_hugepages",
1198                .data           = NULL,
1199                .maxlen         = sizeof(unsigned long),
1200                .mode           = 0644,
1201                .proc_handler   = hugetlb_sysctl_handler,
1202                .extra1         = (void *)&hugetlb_zero,
1203                .extra2         = (void *)&hugetlb_infinity,
1204        },
1205#ifdef CONFIG_NUMA
1206        {
1207                .procname       = "nr_hugepages_mempolicy",
1208                .data           = NULL,
1209                .maxlen         = sizeof(unsigned long),
1210                .mode           = 0644,
1211                .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1212                .extra1         = (void *)&hugetlb_zero,
1213                .extra2         = (void *)&hugetlb_infinity,
1214        },
1215#endif
1216         {
1217                .procname       = "hugetlb_shm_group",
1218                .data           = &sysctl_hugetlb_shm_group,
1219                .maxlen         = sizeof(gid_t),
1220                .mode           = 0644,
1221                .proc_handler   = proc_dointvec,
1222         },
1223         {
1224                .procname       = "hugepages_treat_as_movable",
1225                .data           = &hugepages_treat_as_movable,
1226                .maxlen         = sizeof(int),
1227                .mode           = 0644,
1228                .proc_handler   = hugetlb_treat_movable_handler,
1229        },
1230        {
1231                .procname       = "nr_overcommit_hugepages",
1232                .data           = NULL,
1233                .maxlen         = sizeof(unsigned long),
1234                .mode           = 0644,
1235                .proc_handler   = hugetlb_overcommit_handler,
1236                .extra1         = (void *)&hugetlb_zero,
1237                .extra2         = (void *)&hugetlb_infinity,
1238        },
1239#endif
1240        {
1241                .procname       = "lowmem_reserve_ratio",
1242                .data           = &sysctl_lowmem_reserve_ratio,
1243                .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1244                .mode           = 0644,
1245                .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1246        },
1247        {
1248                .procname       = "drop_caches",
1249                .data           = &sysctl_drop_caches,
1250                .maxlen         = sizeof(int),
1251                .mode           = 0644,
1252                .proc_handler   = drop_caches_sysctl_handler,
1253                .extra1         = &one,
1254                .extra2         = &three,
1255        },
1256#ifdef CONFIG_COMPACTION
1257        {
1258                .procname       = "compact_memory",
1259                .data           = &sysctl_compact_memory,
1260                .maxlen         = sizeof(int),
1261                .mode           = 0200,
1262                .proc_handler   = sysctl_compaction_handler,
1263        },
1264        {
1265                .procname       = "extfrag_threshold",
1266                .data           = &sysctl_extfrag_threshold,
1267                .maxlen         = sizeof(int),
1268                .mode           = 0644,
1269                .proc_handler   = sysctl_extfrag_handler,
1270                .extra1         = &min_extfrag_threshold,
1271                .extra2         = &max_extfrag_threshold,
1272        },
1273
1274#endif /* CONFIG_COMPACTION */
1275        {
1276                .procname       = "min_free_kbytes",
1277                .data           = &min_free_kbytes,
1278                .maxlen         = sizeof(min_free_kbytes),
1279                .mode           = 0644,
1280                .proc_handler   = min_free_kbytes_sysctl_handler,
1281                .extra1         = &zero,
1282        },
1283        {
1284                .procname       = "percpu_pagelist_fraction",
1285                .data           = &percpu_pagelist_fraction,
1286                .maxlen         = sizeof(percpu_pagelist_fraction),
1287                .mode           = 0644,
1288                .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1289                .extra1         = &min_percpu_pagelist_fract,
1290        },
1291#ifdef CONFIG_MMU
1292        {
1293                .procname       = "max_map_count",
1294                .data           = &sysctl_max_map_count,
1295                .maxlen         = sizeof(sysctl_max_map_count),
1296                .mode           = 0644,
1297                .proc_handler   = proc_dointvec_minmax,
1298                .extra1         = &zero,
1299        },
1300#else
1301        {
1302                .procname       = "nr_trim_pages",
1303                .data           = &sysctl_nr_trim_pages,
1304                .maxlen         = sizeof(sysctl_nr_trim_pages),
1305                .mode           = 0644,
1306                .proc_handler   = proc_dointvec_minmax,
1307                .extra1         = &zero,
1308        },
1309#endif
1310        {
1311                .procname       = "laptop_mode",
1312                .data           = &laptop_mode,
1313                .maxlen         = sizeof(laptop_mode),
1314                .mode           = 0644,
1315                .proc_handler   = proc_dointvec_jiffies,
1316        },
1317        {
1318                .procname       = "block_dump",
1319                .data           = &block_dump,
1320                .maxlen         = sizeof(block_dump),
1321                .mode           = 0644,
1322                .proc_handler   = proc_dointvec,
1323                .extra1         = &zero,
1324        },
1325        {
1326                .procname       = "vfs_cache_pressure",
1327                .data           = &sysctl_vfs_cache_pressure,
1328                .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1329                .mode           = 0644,
1330                .proc_handler   = proc_dointvec,
1331                .extra1         = &zero,
1332        },
1333#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1334        {
1335                .procname       = "legacy_va_layout",
1336                .data           = &sysctl_legacy_va_layout,
1337                .maxlen         = sizeof(sysctl_legacy_va_layout),
1338                .mode           = 0644,
1339                .proc_handler   = proc_dointvec,
1340                .extra1         = &zero,
1341        },
1342#endif
1343#ifdef CONFIG_NUMA
1344        {
1345                .procname       = "zone_reclaim_mode",
1346                .data           = &zone_reclaim_mode,
1347                .maxlen         = sizeof(zone_reclaim_mode),
1348                .mode           = 0644,
1349                .proc_handler   = proc_dointvec,
1350                .extra1         = &zero,
1351        },
1352        {
1353                .procname       = "min_unmapped_ratio",
1354                .data           = &sysctl_min_unmapped_ratio,
1355                .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1356                .mode           = 0644,
1357                .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1358                .extra1         = &zero,
1359                .extra2         = &one_hundred,
1360        },
1361        {
1362                .procname       = "min_slab_ratio",
1363                .data           = &sysctl_min_slab_ratio,
1364                .maxlen         = sizeof(sysctl_min_slab_ratio),
1365                .mode           = 0644,
1366                .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1367                .extra1         = &zero,
1368                .extra2         = &one_hundred,
1369        },
1370#endif
1371#ifdef CONFIG_SMP
1372        {
1373                .procname       = "stat_interval",
1374                .data           = &sysctl_stat_interval,
1375                .maxlen         = sizeof(sysctl_stat_interval),
1376                .mode           = 0644,
1377                .proc_handler   = proc_dointvec_jiffies,
1378        },
1379#endif
1380#ifdef CONFIG_MMU
1381        {
1382                .procname       = "mmap_min_addr",
1383                .data           = &dac_mmap_min_addr,
1384                .maxlen         = sizeof(unsigned long),
1385                .mode           = 0644,
1386                .proc_handler   = mmap_min_addr_handler,
1387        },
1388#endif
1389#ifdef CONFIG_NUMA
1390        {
1391                .procname       = "numa_zonelist_order",
1392                .data           = &numa_zonelist_order,
1393                .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1394                .mode           = 0644,
1395                .proc_handler   = numa_zonelist_order_handler,
1396        },
1397#endif
1398#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1399   (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1400        {
1401                .procname       = "vdso_enabled",
1402                .data           = &vdso_enabled,
1403                .maxlen         = sizeof(vdso_enabled),
1404                .mode           = 0644,
1405                .proc_handler   = proc_dointvec,
1406                .extra1         = &zero,
1407        },
1408#endif
1409#ifdef CONFIG_HIGHMEM
1410        {
1411                .procname       = "highmem_is_dirtyable",
1412                .data           = &vm_highmem_is_dirtyable,
1413                .maxlen         = sizeof(vm_highmem_is_dirtyable),
1414                .mode           = 0644,
1415                .proc_handler   = proc_dointvec_minmax,
1416                .extra1         = &zero,
1417                .extra2         = &one,
1418        },
1419#endif
1420        {
1421                .procname       = "scan_unevictable_pages",
1422                .data           = &scan_unevictable_pages,
1423                .maxlen         = sizeof(scan_unevictable_pages),
1424                .mode           = 0644,
1425                .proc_handler   = scan_unevictable_handler,
1426        },
1427#ifdef CONFIG_MEMORY_FAILURE
1428        {
1429                .procname       = "memory_failure_early_kill",
1430                .data           = &sysctl_memory_failure_early_kill,
1431                .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1432                .mode           = 0644,
1433                .proc_handler   = proc_dointvec_minmax,
1434                .extra1         = &zero,
1435                .extra2         = &one,
1436        },
1437        {
1438                .procname       = "memory_failure_recovery",
1439                .data           = &sysctl_memory_failure_recovery,
1440                .maxlen         = sizeof(sysctl_memory_failure_recovery),
1441                .mode           = 0644,
1442                .proc_handler   = proc_dointvec_minmax,
1443                .extra1         = &zero,
1444                .extra2         = &one,
1445        },
1446#endif
1447        {
1448                .procname       = "user_reserve_kbytes",
1449                .data           = &sysctl_user_reserve_kbytes,
1450                .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1451                .mode           = 0644,
1452                .proc_handler   = proc_doulongvec_minmax,
1453        },
1454        {
1455                .procname       = "admin_reserve_kbytes",
1456                .data           = &sysctl_admin_reserve_kbytes,
1457                .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1458                .mode           = 0644,
1459                .proc_handler   = proc_doulongvec_minmax,
1460        },
1461        { }
1462};
1463
1464#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1465static struct ctl_table binfmt_misc_table[] = {
1466        { }
1467};
1468#endif
1469
1470static struct ctl_table fs_table[] = {
1471        {
1472                .procname       = "inode-nr",
1473                .data           = &inodes_stat,
1474                .maxlen         = 2*sizeof(int),
1475                .mode           = 0444,
1476                .proc_handler   = proc_nr_inodes,
1477        },
1478        {
1479                .procname       = "inode-state",
1480                .data           = &inodes_stat,
1481                .maxlen         = 7*sizeof(int),
1482                .mode           = 0444,
1483                .proc_handler   = proc_nr_inodes,
1484        },
1485        {
1486                .procname       = "file-nr",
1487                .data           = &files_stat,
1488                .maxlen         = sizeof(files_stat),
1489                .mode           = 0444,
1490                .proc_handler   = proc_nr_files,
1491        },
1492        {
1493                .procname       = "file-max",
1494                .data           = &files_stat.max_files,
1495                .maxlen         = sizeof(files_stat.max_files),
1496                .mode           = 0644,
1497                .proc_handler   = proc_doulongvec_minmax,
1498        },
1499        {
1500                .procname       = "nr_open",
1501                .data           = &sysctl_nr_open,
1502                .maxlen         = sizeof(int),
1503                .mode           = 0644,
1504                .proc_handler   = proc_dointvec_minmax,
1505                .extra1         = &sysctl_nr_open_min,
1506                .extra2         = &sysctl_nr_open_max,
1507        },
1508        {
1509                .procname       = "dentry-state",
1510                .data           = &dentry_stat,
1511                .maxlen         = 6*sizeof(int),
1512                .mode           = 0444,
1513                .proc_handler   = proc_nr_dentry,
1514        },
1515        {
1516                .procname       = "overflowuid",
1517                .data           = &fs_overflowuid,
1518                .maxlen         = sizeof(int),
1519                .mode           = 0644,
1520                .proc_handler   = proc_dointvec_minmax,
1521                .extra1         = &minolduid,
1522                .extra2         = &maxolduid,
1523        },
1524        {
1525                .procname       = "overflowgid",
1526                .data           = &fs_overflowgid,
1527                .maxlen         = sizeof(int),
1528                .mode           = 0644,
1529                .proc_handler   = proc_dointvec_minmax,
1530                .extra1         = &minolduid,
1531                .extra2         = &maxolduid,
1532        },
1533#ifdef CONFIG_FILE_LOCKING
1534        {
1535                .procname       = "leases-enable",
1536                .data           = &leases_enable,
1537                .maxlen         = sizeof(int),
1538                .mode           = 0644,
1539                .proc_handler   = proc_dointvec,
1540        },
1541#endif
1542#ifdef CONFIG_DNOTIFY
1543        {
1544                .procname       = "dir-notify-enable",
1545                .data           = &dir_notify_enable,
1546                .maxlen         = sizeof(int),
1547                .mode           = 0644,
1548                .proc_handler   = proc_dointvec,
1549        },
1550#endif
1551#ifdef CONFIG_MMU
1552#ifdef CONFIG_FILE_LOCKING
1553        {
1554                .procname       = "lease-break-time",
1555                .data           = &lease_break_time,
1556                .maxlen         = sizeof(int),
1557                .mode           = 0644,
1558                .proc_handler   = proc_dointvec,
1559        },
1560#endif
1561#ifdef CONFIG_AIO
1562        {
1563                .procname       = "aio-nr",
1564                .data           = &aio_nr,
1565                .maxlen         = sizeof(aio_nr),
1566                .mode           = 0444,
1567                .proc_handler   = proc_doulongvec_minmax,
1568        },
1569        {
1570                .procname       = "aio-max-nr",
1571                .data           = &aio_max_nr,
1572                .maxlen         = sizeof(aio_max_nr),
1573                .mode           = 0644,
1574                .proc_handler   = proc_doulongvec_minmax,
1575        },
1576#endif /* CONFIG_AIO */
1577#ifdef CONFIG_INOTIFY_USER
1578        {
1579                .procname       = "inotify",
1580                .mode           = 0555,
1581                .child          = inotify_table,
1582        },
1583#endif  
1584#ifdef CONFIG_EPOLL
1585        {
1586                .procname       = "epoll",
1587                .mode           = 0555,
1588                .child          = epoll_table,
1589        },
1590#endif
1591#endif
1592        {
1593                .procname       = "protected_symlinks",
1594                .data           = &sysctl_protected_symlinks,
1595                .maxlen         = sizeof(int),
1596                .mode           = 0600,
1597                .proc_handler   = proc_dointvec_minmax,
1598                .extra1         = &zero,
1599                .extra2         = &one,
1600        },
1601        {
1602                .procname       = "protected_hardlinks",
1603                .data           = &sysctl_protected_hardlinks,
1604                .maxlen         = sizeof(int),
1605                .mode           = 0600,
1606                .proc_handler   = proc_dointvec_minmax,
1607                .extra1         = &zero,
1608                .extra2         = &one,
1609        },
1610        {
1611                .procname       = "suid_dumpable",
1612                .data           = &suid_dumpable,
1613                .maxlen         = sizeof(int),
1614                .mode           = 0644,
1615                .proc_handler   = proc_dointvec_minmax_coredump,
1616                .extra1         = &zero,
1617                .extra2         = &two,
1618        },
1619#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1620        {
1621                .procname       = "binfmt_misc",
1622                .mode           = 0555,
1623                .child          = binfmt_misc_table,
1624        },
1625#endif
1626        {
1627                .procname       = "pipe-max-size",
1628                .data           = &pipe_max_size,
1629                .maxlen         = sizeof(int),
1630                .mode           = 0644,
1631                .proc_handler   = &pipe_proc_fn,
1632                .extra1         = &pipe_min_size,
1633        },
1634        { }
1635};
1636
1637static struct ctl_table debug_table[] = {
1638#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1639        {
1640                .procname       = "exception-trace",
1641                .data           = &show_unhandled_signals,
1642                .maxlen         = sizeof(int),
1643                .mode           = 0644,
1644                .proc_handler   = proc_dointvec
1645        },
1646#endif
1647#if defined(CONFIG_OPTPROBES)
1648        {
1649                .procname       = "kprobes-optimization",
1650                .data           = &sysctl_kprobes_optimization,
1651                .maxlen         = sizeof(int),
1652                .mode           = 0644,
1653                .proc_handler   = proc_kprobes_optimization_handler,
1654                .extra1         = &zero,
1655                .extra2         = &one,
1656        },
1657#endif
1658        { }
1659};
1660
1661static struct ctl_table dev_table[] = {
1662        { }
1663};
1664
1665int __init sysctl_init(void)
1666{
1667        struct ctl_table_header *hdr;
1668
1669        hdr = register_sysctl_table(sysctl_base_table);
1670        kmemleak_not_leak(hdr);
1671        return 0;
1672}
1673
1674#endif /* CONFIG_SYSCTL */
1675
1676/*
1677 * /proc/sys support
1678 */
1679
1680#ifdef CONFIG_PROC_SYSCTL
1681
1682static int _proc_do_string(void* data, int maxlen, int write,
1683                           void __user *buffer,
1684                           size_t *lenp, loff_t *ppos)
1685{
1686        size_t len;
1687        char __user *p;
1688        char c;
1689
1690        if (!data || !maxlen || !*lenp) {
1691                *lenp = 0;
1692                return 0;
1693        }
1694
1695        if (write) {
1696                len = 0;
1697                p = buffer;
1698                while (len < *lenp) {
1699                        if (get_user(c, p++))
1700                                return -EFAULT;
1701                        if (c == 0 || c == '\n')
1702                                break;
1703                        len++;
1704                }
1705                if (len >= maxlen)
1706                        len = maxlen-1;
1707                if(copy_from_user(data, buffer, len))
1708                        return -EFAULT;
1709                ((char *) data)[len] = 0;
1710                *ppos += *lenp;
1711        } else {
1712                len = strlen(data);
1713                if (len > maxlen)
1714                        len = maxlen;
1715
1716                if (*ppos > len) {
1717                        *lenp = 0;
1718                        return 0;
1719                }
1720
1721                data += *ppos;
1722                len  -= *ppos;
1723
1724                if (len > *lenp)
1725                        len = *lenp;
1726                if (len)
1727                        if(copy_to_user(buffer, data, len))
1728                                return -EFAULT;
1729                if (len < *lenp) {
1730                        if(put_user('\n', ((char __user *) buffer) + len))
1731                                return -EFAULT;
1732                        len++;
1733                }
1734                *lenp = len;
1735                *ppos += len;
1736        }
1737        return 0;
1738}
1739
1740/**
1741 * proc_dostring - read a string sysctl
1742 * @table: the sysctl table
1743 * @write: %TRUE if this is a write to the sysctl file
1744 * @buffer: the user buffer
1745 * @lenp: the size of the user buffer
1746 * @ppos: file position
1747 *
1748 * Reads/writes a string from/to the user buffer. If the kernel
1749 * buffer provided is not large enough to hold the string, the
1750 * string is truncated. The copied string is %NULL-terminated.
1751 * If the string is being read by the user process, it is copied
1752 * and a newline '\n' is added. It is truncated if the buffer is
1753 * not large enough.
1754 *
1755 * Returns 0 on success.
1756 */
1757int proc_dostring(struct ctl_table *table, int write,
1758                  void __user *buffer, size_t *lenp, loff_t *ppos)
1759{
1760        return _proc_do_string(table->data, table->maxlen, write,
1761                               buffer, lenp, ppos);
1762}
1763
1764static size_t proc_skip_spaces(char **buf)
1765{
1766        size_t ret;
1767        char *tmp = skip_spaces(*buf);
1768        ret = tmp - *buf;
1769        *buf = tmp;
1770        return ret;
1771}
1772
1773static void proc_skip_char(char **buf, size_t *size, const char v)
1774{
1775        while (*size) {
1776                if (**buf != v)
1777                        break;
1778                (*size)--;
1779                (*buf)++;
1780        }
1781}
1782
1783#define TMPBUFLEN 22
1784/**
1785 * proc_get_long - reads an ASCII formatted integer from a user buffer
1786 *
1787 * @buf: a kernel buffer
1788 * @size: size of the kernel buffer
1789 * @val: this is where the number will be stored
1790 * @neg: set to %TRUE if number is negative
1791 * @perm_tr: a vector which contains the allowed trailers
1792 * @perm_tr_len: size of the perm_tr vector
1793 * @tr: pointer to store the trailer character
1794 *
1795 * In case of success %0 is returned and @buf and @size are updated with
1796 * the amount of bytes read. If @tr is non-NULL and a trailing
1797 * character exists (size is non-zero after returning from this
1798 * function), @tr is updated with the trailing character.
1799 */
1800static int proc_get_long(char **buf, size_t *size,
1801                          unsigned long *val, bool *neg,
1802                          const char *perm_tr, unsigned perm_tr_len, char *tr)
1803{
1804        int len;
1805        char *p, tmp[TMPBUFLEN];
1806
1807        if (!*size)
1808                return -EINVAL;
1809
1810        len = *size;
1811        if (len > TMPBUFLEN - 1)
1812                len = TMPBUFLEN - 1;
1813
1814        memcpy(tmp, *buf, len);
1815
1816        tmp[len] = 0;
1817        p = tmp;
1818        if (*p == '-' && *size > 1) {
1819                *neg = true;
1820                p++;
1821        } else
1822                *neg = false;
1823        if (!isdigit(*p))
1824                return -EINVAL;
1825
1826        *val = simple_strtoul(p, &p, 0);
1827
1828        len = p - tmp;
1829
1830        /* We don't know if the next char is whitespace thus we may accept
1831         * invalid integers (e.g. 1234...a) or two integers instead of one
1832         * (e.g. 123...1). So lets not allow such large numbers. */
1833        if (len == TMPBUFLEN - 1)
1834                return -EINVAL;
1835
1836        if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1837                return -EINVAL;
1838
1839        if (tr && (len < *size))
1840                *tr = *p;
1841
1842        *buf += len;
1843        *size -= len;
1844
1845        return 0;
1846}
1847
1848/**
1849 * proc_put_long - converts an integer to a decimal ASCII formatted string
1850 *
1851 * @buf: the user buffer
1852 * @size: the size of the user buffer
1853 * @val: the integer to be converted
1854 * @neg: sign of the number, %TRUE for negative
1855 *
1856 * In case of success %0 is returned and @buf and @size are updated with
1857 * the amount of bytes written.
1858 */
1859static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1860                          bool neg)
1861{
1862        int len;
1863        char tmp[TMPBUFLEN], *p = tmp;
1864
1865        sprintf(p, "%s%lu", neg ? "-" : "", val);
1866        len = strlen(tmp);
1867        if (len > *size)
1868                len = *size;
1869        if (copy_to_user(*buf, tmp, len))
1870                return -EFAULT;
1871        *size -= len;
1872        *buf += len;
1873        return 0;
1874}
1875#undef TMPBUFLEN
1876
1877static int proc_put_char(void __user **buf, size_t *size, char c)
1878{
1879        if (*size) {
1880                char __user **buffer = (char __user **)buf;
1881                if (put_user(c, *buffer))
1882                        return -EFAULT;
1883                (*size)--, (*buffer)++;
1884                *buf = *buffer;
1885        }
1886        return 0;
1887}
1888
1889static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1890                                 int *valp,
1891                                 int write, void *data)
1892{
1893        if (write) {
1894                *valp = *negp ? -*lvalp : *lvalp;
1895        } else {
1896                int val = *valp;
1897                if (val < 0) {
1898                        *negp = true;
1899                        *lvalp = (unsigned long)-val;
1900                } else {
1901                        *negp = false;
1902                        *lvalp = (unsigned long)val;
1903                }
1904        }
1905        return 0;
1906}
1907
1908static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1909
1910static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1911                  int write, void __user *buffer,
1912                  size_t *lenp, loff_t *ppos,
1913                  int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1914                              int write, void *data),
1915                  void *data)
1916{
1917        int *i, vleft, first = 1, err = 0;
1918        unsigned long page = 0;
1919        size_t left;
1920        char *kbuf;
1921        
1922        if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1923                *lenp = 0;
1924                return 0;
1925        }
1926        
1927        i = (int *) tbl_data;
1928        vleft = table->maxlen / sizeof(*i);
1929        left = *lenp;
1930
1931        if (!conv)
1932                conv = do_proc_dointvec_conv;
1933
1934        if (write) {
1935                if (left > PAGE_SIZE - 1)
1936                        left = PAGE_SIZE - 1;
1937                page = __get_free_page(GFP_TEMPORARY);
1938                kbuf = (char *) page;
1939                if (!kbuf)
1940                        return -ENOMEM;
1941                if (copy_from_user(kbuf, buffer, left)) {
1942                        err = -EFAULT;
1943                        goto free;
1944                }
1945                kbuf[left] = 0;
1946        }
1947
1948        for (; left && vleft--; i++, first=0) {
1949                unsigned long lval;
1950                bool neg;
1951
1952                if (write) {
1953                        left -= proc_skip_spaces(&kbuf);
1954
1955                        if (!left)
1956                                break;
1957                        err = proc_get_long(&kbuf, &left, &lval, &neg,
1958                                             proc_wspace_sep,
1959                                             sizeof(proc_wspace_sep), NULL);
1960                        if (err)
1961                                break;
1962                        if (conv(&neg, &lval, i, 1, data)) {
1963                                err = -EINVAL;
1964                                break;
1965                        }
1966                } else {
1967                        if (conv(&neg, &lval, i, 0, data)) {
1968                                err = -EINVAL;
1969                                break;
1970                        }
1971                        if (!first)
1972                                err = proc_put_char(&buffer, &left, '\t');
1973                        if (err)
1974                                break;
1975                        err = proc_put_long(&buffer, &left, lval, neg);
1976                        if (err)
1977                                break;
1978                }
1979        }
1980
1981        if (!write && !first && left && !err)
1982                err = proc_put_char(&buffer, &left, '\n');
1983        if (write && !err && left)
1984                left -= proc_skip_spaces(&kbuf);
1985free:
1986        if (write) {
1987                free_page(page);
1988                if (first)
1989                        return err ? : -EINVAL;
1990        }
1991        *lenp -= left;
1992        *ppos += *lenp;
1993        return err;
1994}
1995
1996static int do_proc_dointvec(struct ctl_table *table, int write,
1997                  void __user *buffer, size_t *lenp, loff_t *ppos,
1998                  int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1999                              int write, void *data),
2000                  void *data)
2001{
2002        return __do_proc_dointvec(table->data, table, write,
2003                        buffer, lenp, ppos, conv, data);
2004}
2005
2006/**
2007 * proc_dointvec - read a vector of integers
2008 * @table: the sysctl table
2009 * @write: %TRUE if this is a write to the sysctl file
2010 * @buffer: the user buffer
2011 * @lenp: the size of the user buffer
2012 * @ppos: file position
2013 *
2014 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2015 * values from/to the user buffer, treated as an ASCII string. 
2016 *
2017 * Returns 0 on success.
2018 */
2019int proc_dointvec(struct ctl_table *table, int write,
2020                     void __user *buffer, size_t *lenp, loff_t *ppos)
2021{
2022    return do_proc_dointvec(table,write,buffer,lenp,ppos,
2023                            NULL,NULL);
2024}
2025
2026/*
2027 * Taint values can only be increased
2028 * This means we can safely use a temporary.
2029 */
2030static int proc_taint(struct ctl_table *table, int write,
2031                               void __user *buffer, size_t *lenp, loff_t *ppos)
2032{
2033        struct ctl_table t;
2034        unsigned long tmptaint = get_taint();
2035        int err;
2036
2037        if (write && !capable(CAP_SYS_ADMIN))
2038                return -EPERM;
2039
2040        t = *table;
2041        t.data = &tmptaint;
2042        err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2043        if (err < 0)
2044                return err;
2045
2046        if (write) {
2047                /*
2048                 * Poor man's atomic or. Not worth adding a primitive
2049                 * to everyone's atomic.h for this
2050                 */
2051                int i;
2052                for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2053                        if ((tmptaint >> i) & 1)
2054                                add_taint(i, LOCKDEP_STILL_OK);
2055                }
2056        }
2057
2058        return err;
2059}
2060
2061#ifdef CONFIG_PRINTK
2062static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2063                                void __user *buffer, size_t *lenp, loff_t *ppos)
2064{
2065        if (write && !capable(CAP_SYS_ADMIN))
2066                return -EPERM;
2067
2068        return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2069}
2070#endif
2071
2072struct do_proc_dointvec_minmax_conv_param {
2073        int *min;
2074        int *max;
2075};
2076
2077static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2078                                        int *valp,
2079                                        int write, void *data)
2080{
2081        struct do_proc_dointvec_minmax_conv_param *param = data;
2082        if (write) {
2083                int val = *negp ? -*lvalp : *lvalp;
2084                if ((param->min && *param->min > val) ||
2085                    (param->max && *param->max < val))
2086                        return -EINVAL;
2087                *valp = val;
2088        } else {
2089                int val = *valp;
2090                if (val < 0) {
2091                        *negp = true;
2092                        *lvalp = (unsigned long)-val;
2093                } else {
2094                        *negp = false;
2095                        *lvalp = (unsigned long)val;
2096                }
2097        }
2098        return 0;
2099}
2100
2101/**
2102 * proc_dointvec_minmax - read a vector of integers with min/max values
2103 * @table: the sysctl table
2104 * @write: %TRUE if this is a write to the sysctl file
2105 * @buffer: the user buffer
2106 * @lenp: the size of the user buffer
2107 * @ppos: file position
2108 *
2109 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2110 * values from/to the user buffer, treated as an ASCII string.
2111 *
2112 * This routine will ensure the values are within the range specified by
2113 * table->extra1 (min) and table->extra2 (max).
2114 *
2115 * Returns 0 on success.
2116 */
2117int proc_dointvec_minmax(struct ctl_table *table, int write,
2118                  void __user *buffer, size_t *lenp, loff_t *ppos)
2119{
2120        struct do_proc_dointvec_minmax_conv_param param = {
2121                .min = (int *) table->extra1,
2122                .max = (int *) table->extra2,
2123        };
2124        return do_proc_dointvec(table, write, buffer, lenp, ppos,
2125                                do_proc_dointvec_minmax_conv, &param);
2126}
2127
2128static void validate_coredump_safety(void)
2129{
2130#ifdef CONFIG_COREDUMP
2131        if (suid_dumpable == SUID_DUMP_ROOT &&
2132            core_pattern[0] != '/' && core_pattern[0] != '|') {
2133                printk(KERN_WARNING "Unsafe core_pattern used with "\
2134                        "suid_dumpable=2. Pipe handler or fully qualified "\
2135                        "core dump path required.\n");
2136        }
2137#endif
2138}
2139
2140static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2141                void __user *buffer, size_t *lenp, loff_t *ppos)
2142{
2143        int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2144        if (!error)
2145                validate_coredump_safety();
2146        return error;
2147}
2148
2149#ifdef CONFIG_COREDUMP
2150static int proc_dostring_coredump(struct ctl_table *table, int write,
2151                  void __user *buffer, size_t *lenp, loff_t *ppos)
2152{
2153        int error = proc_dostring(table, write, buffer, lenp, ppos);
2154        if (!error)
2155                validate_coredump_safety();
2156        return error;
2157}
2158#endif
2159
2160static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2161                                     void __user *buffer,
2162                                     size_t *lenp, loff_t *ppos,
2163                                     unsigned long convmul,
2164                                     unsigned long convdiv)
2165{
2166        unsigned long *i, *min, *max;
2167        int vleft, first = 1, err = 0;
2168        unsigned long page = 0;
2169        size_t left;
2170        char *kbuf;
2171
2172        if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2173                *lenp = 0;
2174                return 0;
2175        }
2176
2177        i = (unsigned long *) data;
2178        min = (unsigned long *) table->extra1;
2179        max = (unsigned long *) table->extra2;
2180        vleft = table->maxlen / sizeof(unsigned long);
2181        left = *lenp;
2182
2183        if (write) {
2184                if (left > PAGE_SIZE - 1)
2185                        left = PAGE_SIZE - 1;
2186                page = __get_free_page(GFP_TEMPORARY);
2187                kbuf = (char *) page;
2188                if (!kbuf)
2189                        return -ENOMEM;
2190                if (copy_from_user(kbuf, buffer, left)) {
2191                        err = -EFAULT;
2192                        goto free;
2193                }
2194                kbuf[left] = 0;
2195        }
2196
2197        for (; left && vleft--; i++, first = 0) {
2198                unsigned long val;
2199
2200                if (write) {
2201                        bool neg;
2202
2203                        left -= proc_skip_spaces(&kbuf);
2204
2205                        err = proc_get_long(&kbuf, &left, &val, &neg,
2206                                             proc_wspace_sep,
2207                                             sizeof(proc_wspace_sep), NULL);
2208                        if (err)
2209                                break;
2210                        if (neg)
2211                                continue;
2212                        if ((min && val < *min) || (max && val > *max))
2213                                continue;
2214                        *i = val;
2215                } else {
2216                        val = convdiv * (*i) / convmul;
2217                        if (!first)
2218                                err = proc_put_char(&buffer, &left, '\t');
2219                        err = proc_put_long(&buffer, &left, val, false);
2220                        if (err)
2221                                break;
2222                }
2223        }
2224
2225        if (!write && !first && left && !err)
2226                err = proc_put_char(&buffer, &left, '\n');
2227        if (write && !err)
2228                left -= proc_skip_spaces(&kbuf);
2229free:
2230        if (write) {
2231                free_page(page);
2232                if (first)
2233                        return err ? : -EINVAL;
2234        }
2235        *lenp -= left;
2236        *ppos += *lenp;
2237        return err;
2238}
2239
2240static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2241                                     void __user *buffer,
2242                                     size_t *lenp, loff_t *ppos,
2243                                     unsigned long convmul,
2244                                     unsigned long convdiv)
2245{
2246        return __do_proc_doulongvec_minmax(table->data, table, write,
2247                        buffer, lenp, ppos, convmul, convdiv);
2248}
2249
2250/**
2251 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2252 * @table: the sysctl table
2253 * @write: %TRUE if this is a write to the sysctl file
2254 * @buffer: the user buffer
2255 * @lenp: the size of the user buffer
2256 * @ppos: file position
2257 *
2258 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2259 * values from/to the user buffer, treated as an ASCII string.
2260 *
2261 * This routine will ensure the values are within the range specified by
2262 * table->extra1 (min) and table->extra2 (max).
2263 *
2264 * Returns 0 on success.
2265 */
2266int proc_doulongvec_minmax(struct ctl_table *table, int write,
2267                           void __user *buffer, size_t *lenp, loff_t *ppos)
2268{
2269    return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2270}
2271
2272/**
2273 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2274 * @table: the sysctl table
2275 * @write: %TRUE if this is a write to the sysctl file
2276 * @buffer: the user buffer
2277 * @lenp: the size of the user buffer
2278 * @ppos: file position
2279 *
2280 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2281 * values from/to the user buffer, treated as an ASCII string. The values
2282 * are treated as milliseconds, and converted to jiffies when they are stored.
2283 *
2284 * This routine will ensure the values are within the range specified by
2285 * table->extra1 (min) and table->extra2 (max).
2286 *
2287 * Returns 0 on success.
2288 */
2289int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2290                                      void __user *buffer,
2291                                      size_t *lenp, loff_t *ppos)
2292{
2293    return do_proc_doulongvec_minmax(table, write, buffer,
2294                                     lenp, ppos, HZ, 1000l);
2295}
2296
2297
2298static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2299                                         int *valp,
2300                                         int write, void *data)
2301{
2302        if (write) {
2303                if (*lvalp > LONG_MAX / HZ)
2304                        return 1;
2305                *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2306        } else {
2307                int val = *valp;
2308                unsigned long lval;
2309                if (val < 0) {
2310                        *negp = true;
2311                        lval = (unsigned long)-val;
2312                } else {
2313                        *negp = false;
2314                        lval = (unsigned long)val;
2315                }
2316                *lvalp = lval / HZ;
2317        }
2318        return 0;
2319}
2320
2321static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2322                                                int *valp,
2323                                                int write, void *data)
2324{
2325        if (write) {
2326                if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2327                        return 1;
2328                *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2329        } else {
2330                int val = *valp;
2331                unsigned long lval;
2332                if (val < 0) {
2333                        *negp = true;
2334                        lval = (unsigned long)-val;
2335                } else {
2336                        *negp = false;
2337                        lval = (unsigned long)val;
2338                }
2339                *lvalp = jiffies_to_clock_t(lval);
2340        }
2341        return 0;
2342}
2343
2344static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2345                                            int *valp,
2346                                            int write, void *data)
2347{
2348        if (write) {
2349                unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2350
2351                if (jif > INT_MAX)
2352                        return 1;
2353                *valp = (int)jif;
2354        } else {
2355                int val = *valp;
2356                unsigned long lval;
2357                if (val < 0) {
2358                        *negp = true;
2359                        lval = (unsigned long)-val;
2360                } else {
2361                        *negp = false;
2362                        lval = (unsigned long)val;
2363                }
2364                *lvalp = jiffies_to_msecs(lval);
2365        }
2366        return 0;
2367}
2368
2369/**
2370 * proc_dointvec_jiffies - read a vector of integers as seconds
2371 * @table: the sysctl table
2372 * @write: %TRUE if this is a write to the sysctl file
2373 * @buffer: the user buffer
2374 * @lenp: the size of the user buffer
2375 * @ppos: file position
2376 *
2377 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2378 * values from/to the user buffer, treated as an ASCII string. 
2379 * The values read are assumed to be in seconds, and are converted into
2380 * jiffies.
2381 *
2382 * Returns 0 on success.
2383 */
2384int proc_dointvec_jiffies(struct ctl_table *table, int write,
2385                          void __user *buffer, size_t *lenp, loff_t *ppos)
2386{
2387    return do_proc_dointvec(table,write,buffer,lenp,ppos,
2388                            do_proc_dointvec_jiffies_conv,NULL);
2389}
2390
2391/**
2392 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2393 * @table: the sysctl table
2394 * @write: %TRUE if this is a write to the sysctl file
2395 * @buffer: the user buffer
2396 * @lenp: the size of the user buffer
2397 * @ppos: pointer to the file position
2398 *
2399 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2400 * values from/to the user buffer, treated as an ASCII string. 
2401 * The values read are assumed to be in 1/USER_HZ seconds, and 
2402 * are converted into jiffies.
2403 *
2404 * Returns 0 on success.
2405 */
2406int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2407                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2408{
2409    return do_proc_dointvec(table,write,buffer,lenp,ppos,
2410                            do_proc_dointvec_userhz_jiffies_conv,NULL);
2411}
2412
2413/**
2414 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2415 * @table: the sysctl table
2416 * @write: %TRUE if this is a write to the sysctl file
2417 * @buffer: the user buffer
2418 * @lenp: the size of the user buffer
2419 * @ppos: file position
2420 * @ppos: the current position in the file
2421 *
2422 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2423 * values from/to the user buffer, treated as an ASCII string. 
2424 * The values read are assumed to be in 1/1000 seconds, and 
2425 * are converted into jiffies.
2426 *
2427 * Returns 0 on success.
2428 */
2429int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2430                             void __user *buffer, size_t *lenp, loff_t *ppos)
2431{
2432        return do_proc_dointvec(table, write, buffer, lenp, ppos,
2433                                do_proc_dointvec_ms_jiffies_conv, NULL);
2434}
2435
2436static int proc_do_cad_pid(struct ctl_table *table, int write,
2437                           void __user *buffer, size_t *lenp, loff_t *ppos)
2438{
2439        struct pid *new_pid;
2440        pid_t tmp;
2441        int r;
2442
2443        tmp = pid_vnr(cad_pid);
2444
2445        r = __do_proc_dointvec(&tmp, table, write, buffer,
2446                               lenp, ppos, NULL, NULL);
2447        if (r || !write)
2448                return r;
2449
2450        new_pid = find_get_pid(tmp);
2451        if (!new_pid)
2452                return -ESRCH;
2453
2454        put_pid(xchg(&cad_pid, new_pid));
2455        return 0;
2456}
2457
2458/**
2459 * proc_do_large_bitmap - read/write from/to a large bitmap
2460 * @table: the sysctl table
2461 * @write: %TRUE if this is a write to the sysctl file
2462 * @buffer: the user buffer
2463 * @lenp: the size of the user buffer
2464 * @ppos: file position
2465 *
2466 * The bitmap is stored at table->data and the bitmap length (in bits)
2467 * in table->maxlen.
2468 *
2469 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2470 * large bitmaps may be represented in a compact manner. Writing into
2471 * the file will clear the bitmap then update it with the given input.
2472 *
2473 * Returns 0 on success.
2474 */
2475int proc_do_large_bitmap(struct ctl_table *table, int write,
2476                         void __user *buffer, size_t *lenp, loff_t *ppos)
2477{
2478        int err = 0;
2479        bool first = 1;
2480        size_t left = *lenp;
2481        unsigned long bitmap_len = table->maxlen;
2482        unsigned long *bitmap = (unsigned long *) table->data;
2483        unsigned long *tmp_bitmap = NULL;
2484        char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2485
2486        if (!bitmap_len || !left || (*ppos && !write)) {
2487                *lenp = 0;
2488                return 0;
2489        }
2490
2491        if (write) {
2492                unsigned long page = 0;
2493                char *kbuf;
2494
2495                if (left > PAGE_SIZE - 1)
2496                        left = PAGE_SIZE - 1;
2497
2498                page = __get_free_page(GFP_TEMPORARY);
2499                kbuf = (char *) page;
2500                if (!kbuf)
2501                        return -ENOMEM;
2502                if (copy_from_user(kbuf, buffer, left)) {
2503                        free_page(page);
2504                        return -EFAULT;
2505                }
2506                kbuf[left] = 0;
2507
2508                tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2509                                     GFP_KERNEL);
2510                if (!tmp_bitmap) {
2511                        free_page(page);
2512                        return -ENOMEM;
2513                }
2514                proc_skip_char(&kbuf, &left, '\n');
2515                while (!err && left) {
2516                        unsigned long val_a, val_b;
2517                        bool neg;
2518
2519                        err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2520                                             sizeof(tr_a), &c);
2521                        if (err)
2522                                break;
2523                        if (val_a >= bitmap_len || neg) {
2524                                err = -EINVAL;
2525                                break;
2526                        }
2527
2528                        val_b = val_a;
2529                        if (left) {
2530                                kbuf++;
2531                                left--;
2532                        }
2533
2534                        if (c == '-') {
2535                                err = proc_get_long(&kbuf, &left, &val_b,
2536                                                     &neg, tr_b, sizeof(tr_b),
2537                                                     &c);
2538                                if (err)
2539                                        break;
2540                                if (val_b >= bitmap_len || neg ||
2541                                    val_a > val_b) {
2542                                        err = -EINVAL;
2543                                        break;
2544                                }
2545                                if (left) {
2546                                        kbuf++;
2547                                        left--;
2548                                }
2549                        }
2550
2551                        bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2552                        first = 0;
2553                        proc_skip_char(&kbuf, &left, '\n');
2554                }
2555                free_page(page);
2556        } else {
2557                unsigned long bit_a, bit_b = 0;
2558
2559                while (left) {
2560                        bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2561                        if (bit_a >= bitmap_len)
2562                                break;
2563                        bit_b = find_next_zero_bit(bitmap, bitmap_len,
2564                                                   bit_a + 1) - 1;
2565
2566                        if (!first) {
2567                                err = proc_put_char(&buffer, &left, ',');
2568                                if (err)
2569                                        break;
2570                        }
2571                        err = proc_put_long(&buffer, &left, bit_a, false);
2572                        if (err)
2573                                break;
2574                        if (bit_a != bit_b) {
2575                                err = proc_put_char(&buffer, &left, '-');
2576                                if (err)
2577                                        break;
2578                                err = proc_put_long(&buffer, &left, bit_b, false);
2579                                if (err)
2580                                        break;
2581                        }
2582
2583                        first = 0; bit_b++;
2584                }
2585                if (!err)
2586                        err = proc_put_char(&buffer, &left, '\n');
2587        }
2588
2589        if (!err) {
2590                if (write) {
2591                        if (*ppos)
2592                                bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2593                        else
2594                                bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2595                }
2596                kfree(tmp_bitmap);
2597                *lenp -= left;
2598                *ppos += *lenp;
2599                return 0;
2600        } else {
2601                kfree(tmp_bitmap);
2602                return err;
2603        }
2604}
2605
2606#else /* CONFIG_PROC_SYSCTL */
2607
2608int proc_dostring(struct ctl_table *table, int write,
2609                  void __user *buffer, size_t *lenp, loff_t *ppos)
2610{
2611        return -ENOSYS;
2612}
2613
2614int proc_dointvec(struct ctl_table *table, int write,
2615                  void __user *buffer, size_t *lenp, loff_t *ppos)
2616{
2617        return -ENOSYS;
2618}
2619
2620int proc_dointvec_minmax(struct ctl_table *table, int write,
2621                    void __user *buffer, size_t *lenp, loff_t *ppos)
2622{
2623        return -ENOSYS;
2624}
2625
2626int proc_dointvec_jiffies(struct ctl_table *table, int write,
2627                    void __user *buffer, size_t *lenp, loff_t *ppos)
2628{
2629        return -ENOSYS;
2630}
2631
2632int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2633                    void __user *buffer, size_t *lenp, loff_t *ppos)
2634{
2635        return -ENOSYS;
2636}
2637
2638int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2639                             void __user *buffer, size_t *lenp, loff_t *ppos)
2640{
2641        return -ENOSYS;
2642}
2643
2644int proc_doulongvec_minmax(struct ctl_table *table, int write,
2645                    void __user *buffer, size_t *lenp, loff_t *ppos)
2646{
2647        return -ENOSYS;
2648}
2649
2650int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2651                                      void __user *buffer,
2652                                      size_t *lenp, loff_t *ppos)
2653{
2654    return -ENOSYS;
2655}
2656
2657
2658#endif /* CONFIG_PROC_SYSCTL */
2659
2660/*
2661 * No sense putting this after each symbol definition, twice,
2662 * exception granted :-)
2663 */
2664EXPORT_SYMBOL(proc_dointvec);
2665EXPORT_SYMBOL(proc_dointvec_jiffies);
2666EXPORT_SYMBOL(proc_dointvec_minmax);
2667EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2668EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2669EXPORT_SYMBOL(proc_dostring);
2670EXPORT_SYMBOL(proc_doulongvec_minmax);
2671EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2672
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