kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/bitmap.h>
  27 #include <linux/signal.h>
  28 #include <linux/printk.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/security.h>
  31 #include <linux/ctype.h>
  32 #include <linux/kmemcheck.h>
  33 #include <linux/fs.h>
  34 #include <linux/init.h>
  35 #include <linux/kernel.h>
  36 #include <linux/kobject.h>
  37 #include <linux/net.h>
  38 #include <linux/sysrq.h>
  39 #include <linux/highuid.h>
  40 #include <linux/writeback.h>
  41 #include <linux/ratelimit.h>
  42 #include <linux/compaction.h>
  43 #include <linux/hugetlb.h>
  44 #include <linux/initrd.h>
  45 #include <linux/key.h>
  46 #include <linux/times.h>
  47 #include <linux/limits.h>
  48 #include <linux/dcache.h>
  49 #include <linux/dnotify.h>
  50 #include <linux/syscalls.h>
  51 #include <linux/vmstat.h>
  52 #include <linux/nfs_fs.h>
  53 #include <linux/acpi.h>
  54 #include <linux/reboot.h>
  55 #include <linux/ftrace.h>
  56 #include <linux/perf_event.h>
  57 #include <linux/kprobes.h>
  58 #include <linux/pipe_fs_i.h>
  59 #include <linux/oom.h>
  60 #include <linux/kmod.h>
  61 #include <linux/capability.h>
  62 #include <linux/binfmts.h>
  63
  64 #include <asm/uaccess.h>
  65 #include <asm/processor.h>
  66
  67 #ifdef CONFIG_X86
  68 #include <asm/nmi.h>
  69 #include <asm/stacktrace.h>
  70 #include <asm/io.h>
  71 #endif
  72 #ifdef CONFIG_SPARC
  73 #include <asm/setup.h>
  74 #endif
  75 #ifdef CONFIG_BSD_PROCESS_ACCT
  76 #include <linux/acct.h>
  77 #endif
  78 #ifdef CONFIG_RT_MUTEXES
  79 #include <linux/rtmutex.h>
  80 #endif
  81 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  82 #include <linux/lockdep.h>
  83 #endif
  84 #ifdef CONFIG_CHR_DEV_SG
  85 #include <scsi/sg.h>
  86 #endif
  87
  88 #ifdef CONFIG_LOCKUP_DETECTOR
  89 #include <linux/nmi.h>
  90 #endif
  91
  92
  93 #if defined(CONFIG_SYSCTL)
  94
  95 /* External variables not in a header file. */
  96 extern int sysctl_overcommit_memory;
  97 extern int sysctl_overcommit_ratio;
  98 extern int max_threads;
  99 extern int core_uses_pid;
 100 extern int suid_dumpable;
 101 extern char core_pattern[];
 102 extern unsigned int core_pipe_limit;
 103 extern int pid_max;
 104 extern int min_free_kbytes;
 105 extern int pid_max_min, pid_max_max;
 106 extern int sysctl_drop_caches;
 107 extern int percpu_pagelist_fraction;
 108 extern int compat_log;
 109 extern int latencytop_enabled;
 110 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 111 #ifndef CONFIG_MMU
 112 extern int sysctl_nr_trim_pages;
 113 #endif
 114 #ifdef CONFIG_BLOCK
 115 extern int blk_iopoll_enabled;
 116 #endif
 117
 118 /* Constants used for minimum and  maximum */
 119 #ifdef CONFIG_LOCKUP_DETECTOR
 120 static int sixty = 60;
 121 static int neg_one = -1;
 122 #endif
 123
 124 static int zero;
 125 static int __maybe_unused one = 1;
 126 static int __maybe_unused two = 2;
 127 static int __maybe_unused three = 3;
 128 static unsigned long one_ul = 1;
 129 static int one_hundred = 100;
 130 #ifdef CONFIG_PRINTK
 131 static int ten_thousand = 10000;
 132 #endif
 133
 134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 136
 137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 138 static int maxolduid = 65535;
 139 static int minolduid;
 140 static int min_percpu_pagelist_fract = 8;
 141
 142 static int ngroups_max = NGROUPS_MAX;
 143 static const int cap_last_cap = CAP_LAST_CAP;
 144
 145 #ifdef CONFIG_INOTIFY_USER
 146 #include <linux/inotify.h>
 147 #endif
 148 #ifdef CONFIG_SPARC
 149 #endif
 150
 151 #ifdef CONFIG_SPARC64
 152 extern int sysctl_tsb_ratio;
 153 #endif
 154
 155 #ifdef __hppa__
 156 extern int pwrsw_enabled;
 157 extern int unaligned_enabled;
 158 #endif
 159
 160 #ifdef CONFIG_IA64
 161 extern int no_unaligned_warning;
 162 extern int unaligned_dump_stack;
 163 #endif
 164
 165 #ifdef CONFIG_PROC_SYSCTL
 166 static int proc_do_cad_pid(struct ctl_table *table, int write,
 167                   void __user *buffer, size_t *lenp, loff_t *ppos);
 168 static int proc_taint(struct ctl_table *table, int write,
 169                                void __user *buffer, size_t *lenp, loff_t *ppos);
 170 #endif
 171
 172 #ifdef CONFIG_PRINTK
 173 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 174                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 175 #endif
 176
 177 #ifdef CONFIG_MAGIC_SYSRQ
 178 /* Note: sysrq code uses it's own private copy */
 179 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
 180
 181 static int sysrq_sysctl_handler(ctl_table *table, int write,
 182                                 void __user *buffer, size_t *lenp,
 183                                 loff_t *ppos)
 184 {
 185         int error;
 186
 187         error = proc_dointvec(table, write, buffer, lenp, ppos);
 188         if (error)
 189                 return error;
 190
 191         if (write)
 192                 sysrq_toggle_support(__sysrq_enabled);
 193
 194         return 0;
 195 }
 196
 197 #endif
 198
 199 static struct ctl_table kern_table[];
 200 static struct ctl_table vm_table[];
 201 static struct ctl_table fs_table[];
 202 static struct ctl_table debug_table[];
 203 static struct ctl_table dev_table[];
 204 extern struct ctl_table random_table[];
 205 #ifdef CONFIG_EPOLL
 206 extern struct ctl_table epoll_table[];
 207 #endif
 208
 209 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 210 int sysctl_legacy_va_layout;
 211 #endif
 212
 213 /* The default sysctl tables: */
 214
 215 static struct ctl_table sysctl_base_table[] = {
 216         {
 217                 .procname       = "kernel",
 218                 .mode           = 0555,
 219                 .child          = kern_table,
 220         },
 221         {
 222                 .procname       = "vm",
 223                 .mode           = 0555,
 224                 .child          = vm_table,
 225         },
 226         {
 227                 .procname       = "fs",
 228                 .mode           = 0555,
 229                 .child          = fs_table,
 230         },
 231         {
 232                 .procname       = "debug",
 233                 .mode           = 0555,
 234                 .child          = debug_table,
 235         },
 236         {
 237                 .procname       = "dev",
 238                 .mode           = 0555,
 239                 .child          = dev_table,
 240         },
 241         { }
 242 };
 243
 244 #ifdef CONFIG_SCHED_DEBUG
 245 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 246 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 247 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 248 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 249 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 250 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 251 #endif
 252
 253 #ifdef CONFIG_COMPACTION
 254 static int min_extfrag_threshold;
 255 static int max_extfrag_threshold = 1000;
 256 #endif
 257
 258 static struct ctl_table kern_table[] = {
 259         {
 260                 .procname       = "sched_child_runs_first",
 261                 .data           = &sysctl_sched_child_runs_first,
 262                 .maxlen         = sizeof(unsigned int),
 263                 .mode           = 0644,
 264                 .proc_handler   = proc_dointvec,
 265         },
 266 #ifdef CONFIG_SCHED_DEBUG
 267         {
 268                 .procname       = "sched_min_granularity_ns",
 269                 .data           = &sysctl_sched_min_granularity,
 270                 .maxlen         = sizeof(unsigned int),
 271                 .mode           = 0644,
 272                 .proc_handler   = sched_proc_update_handler,
 273                 .extra1         = &min_sched_granularity_ns,
 274                 .extra2         = &max_sched_granularity_ns,
 275         },
 276         {
 277                 .procname       = "sched_latency_ns",
 278                 .data           = &sysctl_sched_latency,
 279                 .maxlen         = sizeof(unsigned int),
 280                 .mode           = 0644,
 281                 .proc_handler   = sched_proc_update_handler,
 282                 .extra1         = &min_sched_granularity_ns,
 283                 .extra2         = &max_sched_granularity_ns,
 284         },
 285         {
 286                 .procname       = "sched_wakeup_granularity_ns",
 287                 .data           = &sysctl_sched_wakeup_granularity,
 288                 .maxlen         = sizeof(unsigned int),
 289                 .mode           = 0644,
 290                 .proc_handler   = sched_proc_update_handler,
 291                 .extra1         = &min_wakeup_granularity_ns,
 292                 .extra2         = &max_wakeup_granularity_ns,
 293         },
 294         {
 295                 .procname       = "sched_tunable_scaling",
 296                 .data           = &sysctl_sched_tunable_scaling,
 297                 .maxlen         = sizeof(enum sched_tunable_scaling),
 298                 .mode           = 0644,
 299                 .proc_handler   = sched_proc_update_handler,
 300                 .extra1         = &min_sched_tunable_scaling,
 301                 .extra2         = &max_sched_tunable_scaling,
 302         },
 303         {
 304                 .procname       = "sched_migration_cost",
 305                 .data           = &sysctl_sched_migration_cost,
 306                 .maxlen         = sizeof(unsigned int),
 307                 .mode           = 0644,
 308                 .proc_handler   = proc_dointvec,
 309         },
 310         {
 311                 .procname       = "sched_nr_migrate",
 312                 .data           = &sysctl_sched_nr_migrate,
 313                 .maxlen         = sizeof(unsigned int),
 314                 .mode           = 0644,
 315                 .proc_handler   = proc_dointvec,
 316         },
 317         {
 318                 .procname       = "sched_time_avg",
 319                 .data           = &sysctl_sched_time_avg,
 320                 .maxlen         = sizeof(unsigned int),
 321                 .mode           = 0644,
 322                 .proc_handler   = proc_dointvec,
 323         },
 324         {
 325                 .procname       = "sched_shares_window",
 326                 .data           = &sysctl_sched_shares_window,
 327                 .maxlen         = sizeof(unsigned int),
 328                 .mode           = 0644,
 329                 .proc_handler   = proc_dointvec,
 330         },
 331         {
 332                 .procname       = "timer_migration",
 333                 .data           = &sysctl_timer_migration,
 334                 .maxlen         = sizeof(unsigned int),
 335                 .mode           = 0644,
 336                 .proc_handler   = proc_dointvec_minmax,
 337                 .extra1         = &zero,
 338                 .extra2         = &one,
 339         },
 340 #endif
 341         {
 342                 .procname       = "sched_rt_period_us",
 343                 .data           = &sysctl_sched_rt_period,
 344                 .maxlen         = sizeof(unsigned int),
 345                 .mode           = 0644,
 346                 .proc_handler   = sched_rt_handler,
 347         },
 348         {
 349                 .procname       = "sched_rt_runtime_us",
 350                 .data           = &sysctl_sched_rt_runtime,
 351                 .maxlen         = sizeof(int),
 352                 .mode           = 0644,
 353                 .proc_handler   = sched_rt_handler,
 354         },
 355 #ifdef CONFIG_SCHED_AUTOGROUP
 356         {
 357                 .procname       = "sched_autogroup_enabled",
 358                 .data           = &sysctl_sched_autogroup_enabled,
 359                 .maxlen         = sizeof(unsigned int),
 360                 .mode           = 0644,
 361                 .proc_handler   = proc_dointvec_minmax,
 362                 .extra1         = &zero,
 363                 .extra2         = &one,
 364         },
 365 #endif
 366 #ifdef CONFIG_CFS_BANDWIDTH
 367         {
 368                 .procname       = "sched_cfs_bandwidth_slice_us",
 369                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 370                 .maxlen         = sizeof(unsigned int),
 371                 .mode           = 0644,
 372                 .proc_handler   = proc_dointvec_minmax,
 373                 .extra1         = &one,
 374         },
 375 #endif
 376 #ifdef CONFIG_PROVE_LOCKING
 377         {
 378                 .procname       = "prove_locking",
 379                 .data           = &prove_locking,
 380                 .maxlen         = sizeof(int),
 381                 .mode           = 0644,
 382                 .proc_handler   = proc_dointvec,
 383         },
 384 #endif
 385 #ifdef CONFIG_LOCK_STAT
 386         {
 387                 .procname       = "lock_stat",
 388                 .data           = &lock_stat,
 389                 .maxlen         = sizeof(int),
 390                 .mode           = 0644,
 391                 .proc_handler   = proc_dointvec,
 392         },
 393 #endif
 394         {
 395                 .procname       = "panic",
 396                 .data           = &panic_timeout,
 397                 .maxlen         = sizeof(int),
 398                 .mode           = 0644,
 399                 .proc_handler   = proc_dointvec,
 400         },
 401         {
 402                 .procname       = "core_uses_pid",
 403                 .data           = &core_uses_pid,
 404                 .maxlen         = sizeof(int),
 405                 .mode           = 0644,
 406                 .proc_handler   = proc_dointvec,
 407         },
 408         {
 409                 .procname       = "core_pattern",
 410                 .data           = core_pattern,
 411                 .maxlen         = CORENAME_MAX_SIZE,
 412                 .mode           = 0644,
 413                 .proc_handler   = proc_dostring,
 414         },
 415         {
 416                 .procname       = "core_pipe_limit",
 417                 .data           = &core_pipe_limit,
 418                 .maxlen         = sizeof(unsigned int),
 419                 .mode           = 0644,
 420                 .proc_handler   = proc_dointvec,
 421         },
 422 #ifdef CONFIG_PROC_SYSCTL
 423         {
 424                 .procname       = "tainted",
 425                 .maxlen         = sizeof(long),
 426                 .mode           = 0644,
 427                 .proc_handler   = proc_taint,
 428         },
 429 #endif
 430 #ifdef CONFIG_LATENCYTOP
 431         {
 432                 .procname       = "latencytop",
 433                 .data           = &latencytop_enabled,
 434                 .maxlen         = sizeof(int),
 435                 .mode           = 0644,
 436                 .proc_handler   = proc_dointvec,
 437         },
 438 #endif
 439 #ifdef CONFIG_BLK_DEV_INITRD
 440         {
 441                 .procname       = "real-root-dev",
 442                 .data           = &real_root_dev,
 443                 .maxlen         = sizeof(int),
 444                 .mode           = 0644,
 445                 .proc_handler   = proc_dointvec,
 446         },
 447 #endif
 448         {
 449                 .procname       = "print-fatal-signals",
 450                 .data           = &print_fatal_signals,
 451                 .maxlen         = sizeof(int),
 452                 .mode           = 0644,
 453                 .proc_handler   = proc_dointvec,
 454         },
 455 #ifdef CONFIG_SPARC
 456         {
 457                 .procname       = "reboot-cmd",
 458                 .data           = reboot_command,
 459                 .maxlen         = 256,
 460                 .mode           = 0644,
 461                 .proc_handler   = proc_dostring,
 462         },
 463         {
 464                 .procname       = "stop-a",
 465                 .data           = &stop_a_enabled,
 466                 .maxlen         = sizeof (int),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec,
 469         },
 470         {
 471                 .procname       = "scons-poweroff",
 472                 .data           = &scons_pwroff,
 473                 .maxlen         = sizeof (int),
 474                 .mode           = 0644,
 475                 .proc_handler   = proc_dointvec,
 476         },
 477 #endif
 478 #ifdef CONFIG_SPARC64
 479         {
 480                 .procname       = "tsb-ratio",
 481                 .data           = &sysctl_tsb_ratio,
 482                 .maxlen         = sizeof (int),
 483                 .mode           = 0644,
 484                 .proc_handler   = proc_dointvec,
 485         },
 486 #endif
 487 #ifdef __hppa__
 488         {
 489                 .procname       = "soft-power",
 490                 .data           = &pwrsw_enabled,
 491                 .maxlen         = sizeof (int),
 492                 .mode           = 0644,
 493                 .proc_handler   = proc_dointvec,
 494         },
 495         {
 496                 .procname       = "unaligned-trap",
 497                 .data           = &unaligned_enabled,
 498                 .maxlen         = sizeof (int),
 499                 .mode           = 0644,
 500                 .proc_handler   = proc_dointvec,
 501         },
 502 #endif
 503         {
 504                 .procname       = "ctrl-alt-del",
 505                 .data           = &C_A_D,
 506                 .maxlen         = sizeof(int),
 507                 .mode           = 0644,
 508                 .proc_handler   = proc_dointvec,
 509         },
 510 #ifdef CONFIG_FUNCTION_TRACER
 511         {
 512                 .procname       = "ftrace_enabled",
 513                 .data           = &ftrace_enabled,
 514                 .maxlen         = sizeof(int),
 515                 .mode           = 0644,
 516                 .proc_handler   = ftrace_enable_sysctl,
 517         },
 518 #endif
 519 #ifdef CONFIG_STACK_TRACER
 520         {
 521                 .procname       = "stack_tracer_enabled",
 522                 .data           = &stack_tracer_enabled,
 523                 .maxlen         = sizeof(int),
 524                 .mode           = 0644,
 525                 .proc_handler   = stack_trace_sysctl,
 526         },
 527 #endif
 528 #ifdef CONFIG_TRACING
 529         {
 530                 .procname       = "ftrace_dump_on_oops",
 531                 .data           = &ftrace_dump_on_oops,
 532                 .maxlen         = sizeof(int),
 533                 .mode           = 0644,
 534                 .proc_handler   = proc_dointvec,
 535         },
 536 #endif
 537 #ifdef CONFIG_MODULES
 538         {
 539                 .procname       = "modprobe",
 540                 .data           = &modprobe_path,
 541                 .maxlen         = KMOD_PATH_LEN,
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_dostring,
 544         },
 545         {
 546                 .procname       = "modules_disabled",
 547                 .data           = &modules_disabled,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 /* only handle a transition from default "0" to "1" */
 551                 .proc_handler   = proc_dointvec_minmax,
 552                 .extra1         = &one,
 553                 .extra2         = &one,
 554         },
 555 #endif
 556 #ifdef CONFIG_HOTPLUG
 557         {
 558                 .procname       = "hotplug",
 559                 .data           = &uevent_helper,
 560                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 561                 .mode           = 0644,
 562                 .proc_handler   = proc_dostring,
 563         },
 564 #endif
 565 #ifdef CONFIG_CHR_DEV_SG
 566         {
 567                 .procname       = "sg-big-buff",
 568                 .data           = &sg_big_buff,
 569                 .maxlen         = sizeof (int),
 570                 .mode           = 0444,
 571                 .proc_handler   = proc_dointvec,
 572         },
 573 #endif
 574 #ifdef CONFIG_BSD_PROCESS_ACCT
 575         {
 576                 .procname       = "acct",
 577                 .data           = &acct_parm,
 578                 .maxlen         = 3*sizeof(int),
 579                 .mode           = 0644,
 580                 .proc_handler   = proc_dointvec,
 581         },
 582 #endif
 583 #ifdef CONFIG_MAGIC_SYSRQ
 584         {
 585                 .procname       = "sysrq",
 586                 .data           = &__sysrq_enabled,
 587                 .maxlen         = sizeof (int),
 588                 .mode           = 0644,
 589                 .proc_handler   = sysrq_sysctl_handler,
 590         },
 591 #endif
 592 #ifdef CONFIG_PROC_SYSCTL
 593         {
 594                 .procname       = "cad_pid",
 595                 .data           = NULL,
 596                 .maxlen         = sizeof (int),
 597                 .mode           = 0600,
 598                 .proc_handler   = proc_do_cad_pid,
 599         },
 600 #endif
 601         {
 602                 .procname       = "threads-max",
 603                 .data           = &max_threads,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = proc_dointvec,
 607         },
 608         {
 609                 .procname       = "random",
 610                 .mode           = 0555,
 611                 .child          = random_table,
 612         },
 613         {
 614                 .procname       = "usermodehelper",
 615                 .mode           = 0555,
 616                 .child          = usermodehelper_table,
 617         },
 618         {
 619                 .procname       = "overflowuid",
 620                 .data           = &overflowuid,
 621                 .maxlen         = sizeof(int),
 622                 .mode           = 0644,
 623                 .proc_handler   = proc_dointvec_minmax,
 624                 .extra1         = &minolduid,
 625                 .extra2         = &maxolduid,
 626         },
 627         {
 628                 .procname       = "overflowgid",
 629                 .data           = &overflowgid,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 .proc_handler   = proc_dointvec_minmax,
 633                 .extra1         = &minolduid,
 634                 .extra2         = &maxolduid,
 635         },
 636 #ifdef CONFIG_S390
 637 #ifdef CONFIG_MATHEMU
 638         {
 639                 .procname       = "ieee_emulation_warnings",
 640                 .data           = &sysctl_ieee_emulation_warnings,
 641                 .maxlen         = sizeof(int),
 642                 .mode           = 0644,
 643                 .proc_handler   = proc_dointvec,
 644         },
 645 #endif
 646         {
 647                 .procname       = "userprocess_debug",
 648                 .data           = &show_unhandled_signals,
 649                 .maxlen         = sizeof(int),
 650                 .mode           = 0644,
 651                 .proc_handler   = proc_dointvec,
 652         },
 653 #endif
 654         {
 655                 .procname       = "pid_max",
 656                 .data           = &pid_max,
 657                 .maxlen         = sizeof (int),
 658                 .mode           = 0644,
 659                 .proc_handler   = proc_dointvec_minmax,
 660                 .extra1         = &pid_max_min,
 661                 .extra2         = &pid_max_max,
 662         },
 663 #if defined(CONFIG_MODULES) && defined(CONFIG_ENTERPRISE_SUPPORT)
 664         {
 665                 .procname       = "unsupported",
 666                 .data           = &unsupported,
 667                 .maxlen         = sizeof(int),
 668                 .mode           = 0644,
 669                 .proc_handler   = &proc_dointvec,
 670         },
 671 #endif
 672         {
 673                 .procname       = "panic_on_oops",
 674                 .data           = &panic_on_oops,
 675                 .maxlen         = sizeof(int),
 676                 .mode           = 0644,
 677                 .proc_handler   = proc_dointvec,
 678         },
 679 #if defined CONFIG_PRINTK
 680         {
 681                 .procname       = "printk",
 682                 .data           = &console_loglevel,
 683                 .maxlen         = 4*sizeof(int),
 684                 .mode           = 0644,
 685                 .proc_handler   = proc_dointvec,
 686         },
 687         {
 688                 .procname       = "printk_ratelimit",
 689                 .data           = &printk_ratelimit_state.interval,
 690                 .maxlen         = sizeof(int),
 691                 .mode           = 0644,
 692                 .proc_handler   = proc_dointvec_jiffies,
 693         },
 694         {
 695                 .procname       = "printk_ratelimit_burst",
 696                 .data           = &printk_ratelimit_state.burst,
 697                 .maxlen         = sizeof(int),
 698                 .mode           = 0644,
 699                 .proc_handler   = proc_dointvec,
 700         },
 701         {
 702                 .procname       = "printk_delay",
 703                 .data           = &printk_delay_msec,
 704                 .maxlen         = sizeof(int),
 705                 .mode           = 0644,
 706                 .proc_handler   = proc_dointvec_minmax,
 707                 .extra1         = &zero,
 708                 .extra2         = &ten_thousand,
 709         },
 710         {
 711                 .procname       = "dmesg_restrict",
 712                 .data           = &dmesg_restrict,
 713                 .maxlen         = sizeof(int),
 714                 .mode           = 0644,
 715                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 716                 .extra1         = &zero,
 717                 .extra2         = &one,
 718         },
 719         {
 720                 .procname       = "kptr_restrict",
 721                 .data           = &kptr_restrict,
 722                 .maxlen         = sizeof(int),
 723                 .mode           = 0644,
 724                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 725                 .extra1         = &zero,
 726                 .extra2         = &two,
 727         },
 728 #endif
 729         {
 730                 .procname       = "ngroups_max",
 731                 .data           = &ngroups_max,
 732                 .maxlen         = sizeof (int),
 733                 .mode           = 0444,
 734                 .proc_handler   = proc_dointvec,
 735         },
 736         {
 737                 .procname       = "cap_last_cap",
 738                 .data           = (void *)&cap_last_cap,
 739                 .maxlen         = sizeof(int),
 740                 .mode           = 0444,
 741                 .proc_handler   = proc_dointvec,
 742         },
 743 #if defined(CONFIG_LOCKUP_DETECTOR)
 744         {
 745                 .procname       = "watchdog",
 746                 .data           = &watchdog_enabled,
 747                 .maxlen         = sizeof (int),
 748                 .mode           = 0644,
 749                 .proc_handler   = proc_dowatchdog,
 750                 .extra1         = &zero,
 751                 .extra2         = &one,
 752         },
 753         {
 754                 .procname       = "watchdog_thresh",
 755                 .data           = &watchdog_thresh,
 756                 .maxlen         = sizeof(int),
 757                 .mode           = 0644,
 758                 .proc_handler   = proc_dowatchdog,
 759                 .extra1         = &neg_one,
 760                 .extra2         = &sixty,
 761         },
 762         {
 763                 .procname       = "softlockup_panic",
 764                 .data           = &softlockup_panic,
 765                 .maxlen         = sizeof(int),
 766                 .mode           = 0644,
 767                 .proc_handler   = proc_dointvec_minmax,
 768                 .extra1         = &zero,
 769                 .extra2         = &one,
 770         },
 771         {
 772                 .procname       = "nmi_watchdog",
 773                 .data           = &watchdog_enabled,
 774                 .maxlen         = sizeof (int),
 775                 .mode           = 0644,
 776                 .proc_handler   = proc_dowatchdog,
 777                 .extra1         = &zero,
 778                 .extra2         = &one,
 779         },
 780 #endif
 781 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 782         {
 783                 .procname       = "unknown_nmi_panic",
 784                 .data           = &unknown_nmi_panic,
 785                 .maxlen         = sizeof (int),
 786                 .mode           = 0644,
 787                 .proc_handler   = proc_dointvec,
 788         },
 789 #endif
 790 #if defined(CONFIG_X86)
 791         {
 792                 .procname       = "panic_on_unrecovered_nmi",
 793                 .data           = &panic_on_unrecovered_nmi,
 794                 .maxlen         = sizeof(int),
 795                 .mode           = 0644,
 796                 .proc_handler   = proc_dointvec,
 797         },
 798         {
 799                 .procname       = "panic_on_io_nmi",
 800                 .data           = &panic_on_io_nmi,
 801                 .maxlen         = sizeof(int),
 802                 .mode           = 0644,
 803                 .proc_handler   = proc_dointvec,
 804         },
 805 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 806         {
 807                 .procname       = "panic_on_stackoverflow",
 808                 .data           = &sysctl_panic_on_stackoverflow,
 809                 .maxlen         = sizeof(int),
 810                 .mode           = 0644,
 811                 .proc_handler   = proc_dointvec,
 812         },
 813 #endif
 814         {
 815                 .procname       = "bootloader_type",
 816                 .data           = &bootloader_type,
 817                 .maxlen         = sizeof (int),
 818                 .mode           = 0444,
 819                 .proc_handler   = proc_dointvec,
 820         },
 821         {
 822                 .procname       = "bootloader_version",
 823                 .data           = &bootloader_version,
 824                 .maxlen         = sizeof (int),
 825                 .mode           = 0444,
 826                 .proc_handler   = proc_dointvec,
 827         },
 828         {
 829                 .procname       = "kstack_depth_to_print",
 830                 .data           = &kstack_depth_to_print,
 831                 .maxlen         = sizeof(int),
 832                 .mode           = 0644,
 833                 .proc_handler   = proc_dointvec,
 834         },
 835         {
 836                 .procname       = "io_delay_type",
 837                 .data           = &io_delay_type,
 838                 .maxlen         = sizeof(int),
 839                 .mode           = 0644,
 840                 .proc_handler   = proc_dointvec,
 841         },
 842 #endif
 843 #if defined(CONFIG_MMU)
 844         {
 845                 .procname       = "randomize_va_space",
 846                 .data           = &randomize_va_space,
 847                 .maxlen         = sizeof(int),
 848                 .mode           = 0644,
 849                 .proc_handler   = proc_dointvec,
 850         },
 851 #endif
 852         {
 853                 .procname       = "suid_dumpable",
 854                 .data           = &suid_dumpable,
 855                 .maxlen         = sizeof(int),
 856                 .mode           = 0644,
 857                 .proc_handler   = proc_dointvec,
 858         },
 859 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 860         {
 861                 .procname       = "spin_retry",
 862                 .data           = &spin_retry,
 863                 .maxlen         = sizeof (int),
 864                 .mode           = 0644,
 865                 .proc_handler   = proc_dointvec,
 866         },
 867 #endif
 868 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) && !defined(CONFIG_ACPI_PV_SLEEP)
 869         {
 870                 .procname       = "acpi_video_flags",
 871                 .data           = &acpi_realmode_flags,
 872                 .maxlen         = sizeof (unsigned long),
 873                 .mode           = 0644,
 874                 .proc_handler   = proc_doulongvec_minmax,
 875         },
 876 #endif
 877 #ifdef CONFIG_IA64
 878         {
 879                 .procname       = "ignore-unaligned-usertrap",
 880                 .data           = &no_unaligned_warning,
 881                 .maxlen         = sizeof (int),
 882                 .mode           = 0644,
 883                 .proc_handler   = proc_dointvec,
 884         },
 885         {
 886                 .procname       = "unaligned-dump-stack",
 887                 .data           = &unaligned_dump_stack,
 888                 .maxlen         = sizeof (int),
 889                 .mode           = 0644,
 890                 .proc_handler   = proc_dointvec,
 891         },
 892 #endif
 893 #ifdef CONFIG_DETECT_HUNG_TASK
 894         {
 895                 .procname       = "hung_task_panic",
 896                 .data           = &sysctl_hung_task_panic,
 897                 .maxlen         = sizeof(int),
 898                 .mode           = 0644,
 899                 .proc_handler   = proc_dointvec_minmax,
 900                 .extra1         = &zero,
 901                 .extra2         = &one,
 902         },
 903         {
 904                 .procname       = "hung_task_check_count",
 905                 .data           = &sysctl_hung_task_check_count,
 906                 .maxlen         = sizeof(unsigned long),
 907                 .mode           = 0644,
 908                 .proc_handler   = proc_doulongvec_minmax,
 909         },
 910         {
 911                 .procname       = "hung_task_timeout_secs",
 912                 .data           = &sysctl_hung_task_timeout_secs,
 913                 .maxlen         = sizeof(unsigned long),
 914                 .mode           = 0644,
 915                 .proc_handler   = proc_dohung_task_timeout_secs,
 916         },
 917         {
 918                 .procname       = "hung_task_warnings",
 919                 .data           = &sysctl_hung_task_warnings,
 920                 .maxlen         = sizeof(unsigned long),
 921                 .mode           = 0644,
 922                 .proc_handler   = proc_doulongvec_minmax,
 923         },
 924 #endif
 925 #ifdef CONFIG_COMPAT
 926         {
 927                 .procname       = "compat-log",
 928                 .data           = &compat_log,
 929                 .maxlen         = sizeof (int),
 930                 .mode           = 0644,
 931                 .proc_handler   = proc_dointvec,
 932         },
 933 #endif
 934 #ifdef CONFIG_RT_MUTEXES
 935         {
 936                 .procname       = "max_lock_depth",
 937                 .data           = &max_lock_depth,
 938                 .maxlen         = sizeof(int),
 939                 .mode           = 0644,
 940                 .proc_handler   = proc_dointvec,
 941         },
 942 #endif
 943         {
 944                 .procname       = "poweroff_cmd",
 945                 .data           = &poweroff_cmd,
 946                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 947                 .mode           = 0644,
 948                 .proc_handler   = proc_dostring,
 949         },
 950 #ifdef CONFIG_KEYS
 951         {
 952                 .procname       = "keys",
 953                 .mode           = 0555,
 954                 .child          = key_sysctls,
 955         },
 956 #endif
 957 #ifdef CONFIG_RCU_TORTURE_TEST
 958         {
 959                 .procname       = "rcutorture_runnable",
 960                 .data           = &rcutorture_runnable,
 961                 .maxlen         = sizeof(int),
 962                 .mode           = 0644,
 963                 .proc_handler   = proc_dointvec,
 964         },
 965 #endif
 966 #ifdef CONFIG_PERF_EVENTS
 967         /*
 968          * User-space scripts rely on the existence of this file
 969          * as a feature check for perf_events being enabled.
 970          *
 971          * So it's an ABI, do not remove!
 972          */
 973         {
 974                 .procname       = "perf_event_paranoid",
 975                 .data           = &sysctl_perf_event_paranoid,
 976                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
 977                 .mode           = 0644,
 978                 .proc_handler   = proc_dointvec,
 979         },
 980         {
 981                 .procname       = "perf_event_mlock_kb",
 982                 .data           = &sysctl_perf_event_mlock,
 983                 .maxlen         = sizeof(sysctl_perf_event_mlock),
 984                 .mode           = 0644,
 985                 .proc_handler   = proc_dointvec,
 986         },
 987         {
 988                 .procname       = "perf_event_max_sample_rate",
 989                 .data           = &sysctl_perf_event_sample_rate,
 990                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
 991                 .mode           = 0644,
 992                 .proc_handler   = perf_proc_update_handler,
 993         },
 994 #endif
 995 #ifdef CONFIG_KMEMCHECK
 996         {
 997                 .procname       = "kmemcheck",
 998                 .data           = &kmemcheck_enabled,
 999                 .maxlen         = sizeof(int),
1000                 .mode           = 0644,
1001                 .proc_handler   = proc_dointvec,
1002         },
1003 #endif
1004 #ifdef CONFIG_BLOCK
1005         {
1006                 .procname       = "blk_iopoll",
1007                 .data           = &blk_iopoll_enabled,
1008                 .maxlen         = sizeof(int),
1009                 .mode           = 0644,
1010                 .proc_handler   = proc_dointvec,
1011         },
1012 #endif
1013         { }
1014 };
1015
1016 static struct ctl_table vm_table[] = {
1017         {
1018                 .procname       = "overcommit_memory",
1019                 .data           = &sysctl_overcommit_memory,
1020                 .maxlen         = sizeof(sysctl_overcommit_memory),
1021                 .mode           = 0644,
1022                 .proc_handler   = proc_dointvec_minmax,
1023                 .extra1         = &zero,
1024                 .extra2         = &two,
1025         },
1026         {
1027                 .procname       = "panic_on_oom",
1028                 .data           = &sysctl_panic_on_oom,
1029                 .maxlen         = sizeof(sysctl_panic_on_oom),
1030                 .mode           = 0644,
1031                 .proc_handler   = proc_dointvec_minmax,
1032                 .extra1         = &zero,
1033                 .extra2         = &two,
1034         },
1035         {
1036                 .procname       = "oom_kill_allocating_task",
1037                 .data           = &sysctl_oom_kill_allocating_task,
1038                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1039                 .mode           = 0644,
1040                 .proc_handler   = proc_dointvec,
1041         },
1042         {
1043                 .procname       = "oom_dump_tasks",
1044                 .data           = &sysctl_oom_dump_tasks,
1045                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1046                 .mode           = 0644,
1047                 .proc_handler   = proc_dointvec,
1048         },
1049         {
1050                 .procname       = "overcommit_ratio",
1051                 .data           = &sysctl_overcommit_ratio,
1052                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1053                 .mode           = 0644,
1054                 .proc_handler   = proc_dointvec,
1055         },
1056         {
1057                 .procname       = "page-cluster",
1058                 .data           = &page_cluster,
1059                 .maxlen         = sizeof(int),
1060                 .mode           = 0644,
1061                 .proc_handler   = proc_dointvec_minmax,
1062                 .extra1         = &zero,
1063         },
1064         {
1065                 .procname       = "dirty_background_ratio",
1066                 .data           = &dirty_background_ratio,
1067                 .maxlen         = sizeof(dirty_background_ratio),
1068                 .mode           = 0644,
1069                 .proc_handler   = dirty_background_ratio_handler,
1070                 .extra1         = &zero,
1071                 .extra2         = &one_hundred,
1072         },
1073         {
1074                 .procname       = "dirty_background_bytes",
1075                 .data           = &dirty_background_bytes,
1076                 .maxlen         = sizeof(dirty_background_bytes),
1077                 .mode           = 0644,
1078                 .proc_handler   = dirty_background_bytes_handler,
1079                 .extra1         = &one_ul,
1080         },
1081         {
1082                 .procname       = "dirty_ratio",
1083                 .data           = &vm_dirty_ratio,
1084                 .maxlen         = sizeof(vm_dirty_ratio),
1085                 .mode           = 0644,
1086                 .proc_handler   = dirty_ratio_handler,
1087                 .extra1         = &zero,
1088                 .extra2         = &one_hundred,
1089         },
1090         {
1091                 .procname       = "dirty_bytes",
1092                 .data           = &vm_dirty_bytes,
1093                 .maxlen         = sizeof(vm_dirty_bytes),
1094                 .mode           = 0644,
1095                 .proc_handler   = dirty_bytes_handler,
1096                 .extra1         = &dirty_bytes_min,
1097         },
1098         {
1099                 .procname       = "dirty_writeback_centisecs",
1100                 .data           = &dirty_writeback_interval,
1101                 .maxlen         = sizeof(dirty_writeback_interval),
1102                 .mode           = 0644,
1103                 .proc_handler   = dirty_writeback_centisecs_handler,
1104         },
1105         {
1106                 .procname       = "dirty_expire_centisecs",
1107                 .data           = &dirty_expire_interval,
1108                 .maxlen         = sizeof(dirty_expire_interval),
1109                 .mode           = 0644,
1110                 .proc_handler   = proc_dointvec_minmax,
1111                 .extra1         = &zero,
1112         },
1113         {
1114                 .procname       = "nr_pdflush_threads",
1115                 .data           = &nr_pdflush_threads,
1116                 .maxlen         = sizeof nr_pdflush_threads,
1117                 .mode           = 0444 /* read-only*/,
1118                 .proc_handler   = proc_dointvec,
1119         },
1120         {
1121                 .procname       = "swappiness",
1122                 .data           = &vm_swappiness,
1123                 .maxlen         = sizeof(vm_swappiness),
1124                 .mode           = 0644,
1125                 .proc_handler   = proc_dointvec_minmax,
1126                 .extra1         = &zero,
1127                 .extra2         = &one_hundred,
1128         },
1129 #ifdef CONFIG_HUGETLB_PAGE
1130         {
1131                 .procname       = "nr_hugepages",
1132                 .data           = NULL,
1133                 .maxlen         = sizeof(unsigned long),
1134                 .mode           = 0644,
1135                 .proc_handler   = hugetlb_sysctl_handler,
1136                 .extra1         = (void *)&hugetlb_zero,
1137                 .extra2         = (void *)&hugetlb_infinity,
1138         },
1139 #ifdef CONFIG_NUMA
1140         {
1141                 .procname       = "nr_hugepages_mempolicy",
1142                 .data           = NULL,
1143                 .maxlen         = sizeof(unsigned long),
1144                 .mode           = 0644,
1145                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1146                 .extra1         = (void *)&hugetlb_zero,
1147                 .extra2         = (void *)&hugetlb_infinity,
1148         },
1149 #endif
1150          {
1151                 .procname       = "hugetlb_shm_group",
1152                 .data           = &sysctl_hugetlb_shm_group,
1153                 .maxlen         = sizeof(gid_t),
1154                 .mode           = 0644,
1155                 .proc_handler   = proc_dointvec,
1156          },
1157          {
1158                 .procname       = "hugepages_treat_as_movable",
1159                 .data           = &hugepages_treat_as_movable,
1160                 .maxlen         = sizeof(int),
1161                 .mode           = 0644,
1162                 .proc_handler   = hugetlb_treat_movable_handler,
1163         },
1164         {
1165                 .procname       = "nr_overcommit_hugepages",
1166                 .data           = NULL,
1167                 .maxlen         = sizeof(unsigned long),
1168                 .mode           = 0644,
1169                 .proc_handler   = hugetlb_overcommit_handler,
1170                 .extra1         = (void *)&hugetlb_zero,
1171                 .extra2         = (void *)&hugetlb_infinity,
1172         },
1173 #endif
1174         {
1175                 .procname       = "lowmem_reserve_ratio",
1176                 .data           = &sysctl_lowmem_reserve_ratio,
1177                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1178                 .mode           = 0644,
1179                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1180         },
1181         {
1182                 .procname       = "drop_caches",
1183                 .data           = &sysctl_drop_caches,
1184                 .maxlen         = sizeof(int),
1185                 .mode           = 0644,
1186                 .proc_handler   = drop_caches_sysctl_handler,
1187                 .extra1         = &one,
1188                 .extra2         = &three,
1189         },
1190 #ifdef CONFIG_COMPACTION
1191         {
1192                 .procname       = "compact_memory",
1193                 .data           = &sysctl_compact_memory,
1194                 .maxlen         = sizeof(int),
1195                 .mode           = 0200,
1196                 .proc_handler   = sysctl_compaction_handler,
1197         },
1198         {
1199                 .procname       = "extfrag_threshold",
1200                 .data           = &sysctl_extfrag_threshold,
1201                 .maxlen         = sizeof(int),
1202                 .mode           = 0644,
1203                 .proc_handler   = sysctl_extfrag_handler,
1204                 .extra1         = &min_extfrag_threshold,
1205                 .extra2         = &max_extfrag_threshold,
1206         },
1207
1208 #endif /* CONFIG_COMPACTION */
1209         {
1210                 .procname       = "min_free_kbytes",
1211                 .data           = &min_free_kbytes,
1212                 .maxlen         = sizeof(min_free_kbytes),
1213                 .mode           = 0644,
1214                 .proc_handler   = min_free_kbytes_sysctl_handler,
1215                 .extra1         = &zero,
1216         },
1217         {
1218                 .procname       = "percpu_pagelist_fraction",
1219                 .data           = &percpu_pagelist_fraction,
1220                 .maxlen         = sizeof(percpu_pagelist_fraction),
1221                 .mode           = 0644,
1222                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1223                 .extra1         = &min_percpu_pagelist_fract,
1224         },
1225 #ifdef CONFIG_MMU
1226         {
1227                 .procname       = "max_map_count",
1228                 .data           = &sysctl_max_map_count,
1229                 .maxlen         = sizeof(sysctl_max_map_count),
1230                 .mode           = 0644,
1231                 .proc_handler   = proc_dointvec_minmax,
1232                 .extra1         = &zero,
1233         },
1234 #else
1235         {
1236                 .procname       = "nr_trim_pages",
1237                 .data           = &sysctl_nr_trim_pages,
1238                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1239                 .mode           = 0644,
1240                 .proc_handler   = proc_dointvec_minmax,
1241                 .extra1         = &zero,
1242         },
1243 #endif
1244         {
1245                 .procname       = "laptop_mode",
1246                 .data           = &laptop_mode,
1247                 .maxlen         = sizeof(laptop_mode),
1248                 .mode           = 0644,
1249                 .proc_handler   = proc_dointvec_jiffies,
1250         },
1251         {
1252                 .procname       = "block_dump",
1253                 .data           = &block_dump,
1254                 .maxlen         = sizeof(block_dump),
1255                 .mode           = 0644,
1256                 .proc_handler   = proc_dointvec,
1257                 .extra1         = &zero,
1258         },
1259         {
1260                 .procname       = "vfs_cache_pressure",
1261                 .data           = &sysctl_vfs_cache_pressure,
1262                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1263                 .mode           = 0644,
1264                 .proc_handler   = proc_dointvec,
1265                 .extra1         = &zero,
1266         },
1267 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1268         {
1269                 .procname       = "legacy_va_layout",
1270                 .data           = &sysctl_legacy_va_layout,
1271                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1272                 .mode           = 0644,
1273                 .proc_handler   = proc_dointvec,
1274                 .extra1         = &zero,
1275         },
1276 #endif
1277 #ifdef CONFIG_NUMA
1278         {
1279                 .procname       = "zone_reclaim_mode",
1280                 .data           = &zone_reclaim_mode,
1281                 .maxlen         = sizeof(zone_reclaim_mode),
1282                 .mode           = 0644,
1283                 .proc_handler   = proc_dointvec,
1284                 .extra1         = &zero,
1285         },
1286         {
1287                 .procname       = "min_unmapped_ratio",
1288                 .data           = &sysctl_min_unmapped_ratio,
1289                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1290                 .mode           = 0644,
1291                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1292                 .extra1         = &zero,
1293                 .extra2         = &one_hundred,
1294         },
1295         {
1296                 .procname       = "min_slab_ratio",
1297                 .data           = &sysctl_min_slab_ratio,
1298                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1299                 .mode           = 0644,
1300                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1301                 .extra1         = &zero,
1302                 .extra2         = &one_hundred,
1303         },
1304 #endif
1305 #ifdef CONFIG_SMP
1306         {
1307                 .procname       = "stat_interval",
1308                 .data           = &sysctl_stat_interval,
1309                 .maxlen         = sizeof(sysctl_stat_interval),
1310                 .mode           = 0644,
1311                 .proc_handler   = proc_dointvec_jiffies,
1312         },
1313 #endif
1314 #ifdef CONFIG_MMU
1315         {
1316                 .procname       = "mmap_min_addr",
1317                 .data           = &dac_mmap_min_addr,
1318                 .maxlen         = sizeof(unsigned long),
1319                 .mode           = 0644,
1320                 .proc_handler   = mmap_min_addr_handler,
1321         },
1322 #endif
1323 #ifdef CONFIG_NUMA
1324         {
1325                 .procname       = "numa_zonelist_order",
1326                 .data           = &numa_zonelist_order,
1327                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1328                 .mode           = 0644,
1329                 .proc_handler   = numa_zonelist_order_handler,
1330         },
1331 #endif
1332 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1333    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1334         {
1335                 .procname       = "vdso_enabled",
1336                 .data           = &vdso_enabled,
1337                 .maxlen         = sizeof(vdso_enabled),
1338                 .mode           = 0644,
1339                 .proc_handler   = proc_dointvec,
1340                 .extra1         = &zero,
1341         },
1342 #endif
1343 #ifdef CONFIG_HIGHMEM
1344         {
1345                 .procname       = "highmem_is_dirtyable",
1346                 .data           = &vm_highmem_is_dirtyable,
1347                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1348                 .mode           = 0644,
1349                 .proc_handler   = proc_dointvec_minmax,
1350                 .extra1         = &zero,
1351                 .extra2         = &one,
1352         },
1353 #endif
1354         {
1355                 .procname       = "scan_unevictable_pages",
1356                 .data           = &scan_unevictable_pages,
1357                 .maxlen         = sizeof(scan_unevictable_pages),
1358                 .mode           = 0644,
1359                 .proc_handler   = scan_unevictable_handler,
1360         },
1361 #ifdef CONFIG_MEMORY_FAILURE
1362         {
1363                 .procname       = "memory_failure_early_kill",
1364                 .data           = &sysctl_memory_failure_early_kill,
1365                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1366                 .mode           = 0644,
1367                 .proc_handler   = proc_dointvec_minmax,
1368                 .extra1         = &zero,
1369                 .extra2         = &one,
1370         },
1371         {
1372                 .procname       = "memory_failure_recovery",
1373                 .data           = &sysctl_memory_failure_recovery,
1374                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1375                 .mode           = 0644,
1376                 .proc_handler   = proc_dointvec_minmax,
1377                 .extra1         = &zero,
1378                 .extra2         = &one,
1379         },
1380 #endif
1381         { }
1382 };
1383
1384 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1385 static struct ctl_table binfmt_misc_table[] = {
1386         { }
1387 };
1388 #endif
1389
1390 static struct ctl_table fs_table[] = {
1391         {
1392                 .procname       = "inode-nr",
1393                 .data           = &inodes_stat,
1394                 .maxlen         = 2*sizeof(int),
1395                 .mode           = 0444,
1396                 .proc_handler   = proc_nr_inodes,
1397         },
1398         {
1399                 .procname       = "inode-state",
1400                 .data           = &inodes_stat,
1401                 .maxlen         = 7*sizeof(int),
1402                 .mode           = 0444,
1403                 .proc_handler   = proc_nr_inodes,
1404         },
1405         {
1406                 .procname       = "file-nr",
1407                 .data           = &files_stat,
1408                 .maxlen         = sizeof(files_stat),
1409                 .mode           = 0444,
1410                 .proc_handler   = proc_nr_files,
1411         },
1412         {
1413                 .procname       = "file-max",
1414                 .data           = &files_stat.max_files,
1415                 .maxlen         = sizeof(files_stat.max_files),
1416                 .mode           = 0644,
1417                 .proc_handler   = proc_doulongvec_minmax,
1418         },
1419         {
1420                 .procname       = "nr_open",
1421                 .data           = &sysctl_nr_open,
1422                 .maxlen         = sizeof(int),
1423                 .mode           = 0644,
1424                 .proc_handler   = proc_dointvec_minmax,
1425                 .extra1         = &sysctl_nr_open_min,
1426                 .extra2         = &sysctl_nr_open_max,
1427         },
1428         {
1429                 .procname       = "dentry-state",
1430                 .data           = &dentry_stat,
1431                 .maxlen         = 6*sizeof(int),
1432                 .mode           = 0444,
1433                 .proc_handler   = proc_nr_dentry,
1434         },
1435         {
1436                 .procname       = "overflowuid",
1437                 .data           = &fs_overflowuid,
1438                 .maxlen         = sizeof(int),
1439                 .mode           = 0644,
1440                 .proc_handler   = proc_dointvec_minmax,
1441                 .extra1         = &minolduid,
1442                 .extra2         = &maxolduid,
1443         },
1444         {
1445                 .procname       = "overflowgid",
1446                 .data           = &fs_overflowgid,
1447                 .maxlen         = sizeof(int),
1448                 .mode           = 0644,
1449                 .proc_handler   = proc_dointvec_minmax,
1450                 .extra1         = &minolduid,
1451                 .extra2         = &maxolduid,
1452         },
1453 #ifdef CONFIG_FILE_LOCKING
1454         {
1455                 .procname       = "leases-enable",
1456                 .data           = &leases_enable,
1457                 .maxlen         = sizeof(int),
1458                 .mode           = 0644,
1459                 .proc_handler   = proc_dointvec,
1460         },
1461 #endif
1462 #ifdef CONFIG_DNOTIFY
1463         {
1464                 .procname       = "dir-notify-enable",
1465                 .data           = &dir_notify_enable,
1466                 .maxlen         = sizeof(int),
1467                 .mode           = 0644,
1468                 .proc_handler   = proc_dointvec,
1469         },
1470 #endif
1471 #ifdef CONFIG_MMU
1472 #ifdef CONFIG_FILE_LOCKING
1473         {
1474                 .procname       = "lease-break-time",
1475                 .data           = &lease_break_time,
1476                 .maxlen         = sizeof(int),
1477                 .mode           = 0644,
1478                 .proc_handler   = proc_dointvec,
1479         },
1480 #endif
1481 #ifdef CONFIG_AIO
1482         {
1483                 .procname       = "aio-nr",
1484                 .data           = &aio_nr,
1485                 .maxlen         = sizeof(aio_nr),
1486                 .mode           = 0444,
1487                 .proc_handler   = proc_doulongvec_minmax,
1488         },
1489         {
1490                 .procname       = "aio-max-nr",
1491                 .data           = &aio_max_nr,
1492                 .maxlen         = sizeof(aio_max_nr),
1493                 .mode           = 0644,
1494                 .proc_handler   = proc_doulongvec_minmax,
1495         },
1496 #endif /* CONFIG_AIO */
1497 #ifdef CONFIG_INOTIFY_USER
1498         {
1499                 .procname       = "inotify",
1500                 .mode           = 0555,
1501                 .child          = inotify_table,
1502         },
1503 #endif
1504 #ifdef CONFIG_EPOLL
1505         {
1506                 .procname       = "epoll",
1507                 .mode           = 0555,
1508                 .child          = epoll_table,
1509         },
1510 #endif
1511 #endif
1512         {
1513                 .procname       = "suid_dumpable",
1514                 .data           = &suid_dumpable,
1515                 .maxlen         = sizeof(int),
1516                 .mode           = 0644,
1517                 .proc_handler   = proc_dointvec_minmax,
1518                 .extra1         = &zero,
1519                 .extra2         = &two,
1520         },
1521 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1522         {
1523                 .procname       = "binfmt_misc",
1524                 .mode           = 0555,
1525                 .child          = binfmt_misc_table,
1526         },
1527 #endif
1528         {
1529                 .procname       = "pipe-max-size",
1530                 .data           = &pipe_max_size,
1531                 .maxlen         = sizeof(int),
1532                 .mode           = 0644,
1533                 .proc_handler   = &pipe_proc_fn,
1534                 .extra1         = &pipe_min_size,
1535         },
1536         { }
1537 };
1538
1539 static struct ctl_table debug_table[] = {
1540 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1541     defined(CONFIG_S390) || defined(CONFIG_TILE)
1542         {
1543                 .procname       = "exception-trace",
1544                 .data           = &show_unhandled_signals,
1545                 .maxlen         = sizeof(int),
1546                 .mode           = 0644,
1547                 .proc_handler   = proc_dointvec
1548         },
1549 #endif
1550 #if defined(CONFIG_OPTPROBES)
1551         {
1552                 .procname       = "kprobes-optimization",
1553                 .data           = &sysctl_kprobes_optimization,
1554                 .maxlen         = sizeof(int),
1555                 .mode           = 0644,
1556                 .proc_handler   = proc_kprobes_optimization_handler,
1557                 .extra1         = &zero,
1558                 .extra2         = &one,
1559         },
1560 #endif
1561         { }
1562 };
1563
1564 static struct ctl_table dev_table[] = {
1565         { }
1566 };
1567
1568 int __init sysctl_init(void)
1569 {
1570         register_sysctl_table(sysctl_base_table);
1571         return 0;
1572 }
1573
1574 #endif /* CONFIG_SYSCTL */
1575
1576 /*
1577  * /proc/sys support
1578  */
1579
1580 #ifdef CONFIG_PROC_SYSCTL
1581
1582 static int _proc_do_string(void* data, int maxlen, int write,
1583                            void __user *buffer,
1584                            size_t *lenp, loff_t *ppos)
1585 {
1586         size_t len;
1587         char __user *p;
1588         char c;
1589
1590         if (!data || !maxlen || !*lenp) {
1591                 *lenp = 0;
1592                 return 0;
1593         }
1594
1595         if (write) {
1596                 len = 0;
1597                 p = buffer;
1598                 while (len < *lenp) {
1599                         if (get_user(c, p++))
1600                                 return -EFAULT;
1601                         if (c == 0 || c == '\n')
1602                                 break;
1603                         len++;
1604                 }
1605                 if (len >= maxlen)
1606                         len = maxlen-1;
1607                 if(copy_from_user(data, buffer, len))
1608                         return -EFAULT;
1609                 ((char *) data)[len] = 0;
1610                 *ppos += *lenp;
1611         } else {
1612                 len = strlen(data);
1613                 if (len > maxlen)
1614                         len = maxlen;
1615
1616                 if (*ppos > len) {
1617                         *lenp = 0;
1618                         return 0;
1619                 }
1620
1621                 data += *ppos;
1622                 len  -= *ppos;
1623
1624                 if (len > *lenp)
1625                         len = *lenp;
1626                 if (len)
1627                         if(copy_to_user(buffer, data, len))
1628                                 return -EFAULT;
1629                 if (len < *lenp) {
1630                         if(put_user('\n', ((char __user *) buffer) + len))
1631                                 return -EFAULT;
1632                         len++;
1633                 }
1634                 *lenp = len;
1635                 *ppos += len;
1636         }
1637         return 0;
1638 }
1639
1640 /**
1641  * proc_dostring - read a string sysctl
1642  * @table: the sysctl table
1643  * @write: %TRUE if this is a write to the sysctl file
1644  * @buffer: the user buffer
1645  * @lenp: the size of the user buffer
1646  * @ppos: file position
1647  *
1648  * Reads/writes a string from/to the user buffer. If the kernel
1649  * buffer provided is not large enough to hold the string, the
1650  * string is truncated. The copied string is %NULL-terminated.
1651  * If the string is being read by the user process, it is copied
1652  * and a newline '\n' is added. It is truncated if the buffer is
1653  * not large enough.
1654  *
1655  * Returns 0 on success.
1656  */
1657 int proc_dostring(struct ctl_table *table, int write,
1658                   void __user *buffer, size_t *lenp, loff_t *ppos)
1659 {
1660         return _proc_do_string(table->data, table->maxlen, write,
1661                                buffer, lenp, ppos);
1662 }
1663
1664 static size_t proc_skip_spaces(char **buf)
1665 {
1666         size_t ret;
1667         char *tmp = skip_spaces(*buf);
1668         ret = tmp - *buf;
1669         *buf = tmp;
1670         return ret;
1671 }
1672
1673 static void proc_skip_char(char **buf, size_t *size, const char v)
1674 {
1675         while (*size) {
1676                 if (**buf != v)
1677                         break;
1678                 (*size)--;
1679                 (*buf)++;
1680         }
1681 }
1682
1683 #define TMPBUFLEN 22
1684 /**
1685  * proc_get_long - reads an ASCII formatted integer from a user buffer
1686  *
1687  * @buf: a kernel buffer
1688  * @size: size of the kernel buffer
1689  * @val: this is where the number will be stored
1690  * @neg: set to %TRUE if number is negative
1691  * @perm_tr: a vector which contains the allowed trailers
1692  * @perm_tr_len: size of the perm_tr vector
1693  * @tr: pointer to store the trailer character
1694  *
1695  * In case of success %0 is returned and @buf and @size are updated with
1696  * the amount of bytes read. If @tr is non-NULL and a trailing
1697  * character exists (size is non-zero after returning from this
1698  * function), @tr is updated with the trailing character.
1699  */
1700 static int proc_get_long(char **buf, size_t *size,
1701                           unsigned long *val, bool *neg,
1702                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1703 {
1704         int len;
1705         char *p, tmp[TMPBUFLEN];
1706
1707         if (!*size)
1708                 return -EINVAL;
1709
1710         len = *size;
1711         if (len > TMPBUFLEN - 1)
1712                 len = TMPBUFLEN - 1;
1713
1714         memcpy(tmp, *buf, len);
1715
1716         tmp[len] = 0;
1717         p = tmp;
1718         if (*p == '-' && *size > 1) {
1719                 *neg = true;
1720                 p++;
1721         } else
1722                 *neg = false;
1723         if (!isdigit(*p))
1724                 return -EINVAL;
1725
1726         *val = simple_strtoul(p, &p, 0);
1727
1728         len = p - tmp;
1729
1730         /* We don't know if the next char is whitespace thus we may accept
1731          * invalid integers (e.g. 1234...a) or two integers instead of one
1732          * (e.g. 123...1). So lets not allow such large numbers. */
1733         if (len == TMPBUFLEN - 1)
1734                 return -EINVAL;
1735
1736         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1737                 return -EINVAL;
1738
1739         if (tr && (len < *size))
1740                 *tr = *p;
1741
1742         *buf += len;
1743         *size -= len;
1744
1745         return 0;
1746 }
1747
1748 /**
1749  * proc_put_long - converts an integer to a decimal ASCII formatted string
1750  *
1751  * @buf: the user buffer
1752  * @size: the size of the user buffer
1753  * @val: the integer to be converted
1754  * @neg: sign of the number, %TRUE for negative
1755  *
1756  * In case of success %0 is returned and @buf and @size are updated with
1757  * the amount of bytes written.
1758  */
1759 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1760                           bool neg)
1761 {
1762         int len;
1763         char tmp[TMPBUFLEN], *p = tmp;
1764
1765         sprintf(p, "%s%lu", neg ? "-" : "", val);
1766         len = strlen(tmp);
1767         if (len > *size)
1768                 len = *size;
1769         if (copy_to_user(*buf, tmp, len))
1770                 return -EFAULT;
1771         *size -= len;
1772         *buf += len;
1773         return 0;
1774 }
1775 #undef TMPBUFLEN
1776
1777 static int proc_put_char(void __user **buf, size_t *size, char c)
1778 {
1779         if (*size) {
1780                 char __user **buffer = (char __user **)buf;
1781                 if (put_user(c, *buffer))
1782                         return -EFAULT;
1783                 (*size)--, (*buffer)++;
1784                 *buf = *buffer;
1785         }
1786         return 0;
1787 }
1788
1789 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1790                                  int *valp,
1791                                  int write, void *data)
1792 {
1793         if (write) {
1794                 *valp = *negp ? -*lvalp : *lvalp;
1795         } else {
1796                 int val = *valp;
1797                 if (val < 0) {
1798                         *negp = true;
1799                         *lvalp = (unsigned long)-val;
1800                 } else {
1801                         *negp = false;
1802                         *lvalp = (unsigned long)val;
1803                 }
1804         }
1805         return 0;
1806 }
1807
1808 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1809
1810 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1811                   int write, void __user *buffer,
1812                   size_t *lenp, loff_t *ppos,
1813                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1814                               int write, void *data),
1815                   void *data)
1816 {
1817         int *i, vleft, first = 1, err = 0;
1818         unsigned long page = 0;
1819         size_t left;
1820         char *kbuf;
1821
1822         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1823                 *lenp = 0;
1824                 return 0;
1825         }
1826
1827         i = (int *) tbl_data;
1828         vleft = table->maxlen / sizeof(*i);
1829         left = *lenp;
1830
1831         if (!conv)
1832                 conv = do_proc_dointvec_conv;
1833
1834         if (write) {
1835                 if (left > PAGE_SIZE - 1)
1836                         left = PAGE_SIZE - 1;
1837                 page = __get_free_page(GFP_TEMPORARY);
1838                 kbuf = (char *) page;
1839                 if (!kbuf)
1840                         return -ENOMEM;
1841                 if (copy_from_user(kbuf, buffer, left)) {
1842                         err = -EFAULT;
1843                         goto free;
1844                 }
1845                 kbuf[left] = 0;
1846         }
1847
1848         for (; left && vleft--; i++, first=0) {
1849                 unsigned long lval;
1850                 bool neg;
1851
1852                 if (write) {
1853                         left -= proc_skip_spaces(&kbuf);
1854
1855                         if (!left)
1856                                 break;
1857                         err = proc_get_long(&kbuf, &left, &lval, &neg,
1858                                              proc_wspace_sep,
1859                                              sizeof(proc_wspace_sep), NULL);
1860                         if (err)
1861                                 break;
1862                         if (conv(&neg, &lval, i, 1, data)) {
1863                                 err = -EINVAL;
1864                                 break;
1865                         }
1866                 } else {
1867                         if (conv(&neg, &lval, i, 0, data)) {
1868                                 err = -EINVAL;
1869                                 break;
1870                         }
1871                         if (!first)
1872                                 err = proc_put_char(&buffer, &left, '\t');
1873                         if (err)
1874                                 break;
1875                         err = proc_put_long(&buffer, &left, lval, neg);
1876                         if (err)
1877                                 break;
1878                 }
1879         }
1880
1881         if (!write && !first && left && !err)
1882                 err = proc_put_char(&buffer, &left, '\n');
1883         if (write && !err && left)
1884                 left -= proc_skip_spaces(&kbuf);
1885 free:
1886         if (write) {
1887                 free_page(page);
1888                 if (first)
1889                         return err ? : -EINVAL;
1890         }
1891         *lenp -= left;
1892         *ppos += *lenp;
1893         return err;
1894 }
1895
1896 static int do_proc_dointvec(struct ctl_table *table, int write,
1897                   void __user *buffer, size_t *lenp, loff_t *ppos,
1898                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1899                               int write, void *data),
1900                   void *data)
1901 {
1902         return __do_proc_dointvec(table->data, table, write,
1903                         buffer, lenp, ppos, conv, data);
1904 }
1905
1906 /**
1907  * proc_dointvec - read a vector of integers
1908  * @table: the sysctl table
1909  * @write: %TRUE if this is a write to the sysctl file
1910  * @buffer: the user buffer
1911  * @lenp: the size of the user buffer
1912  * @ppos: file position
1913  *
1914  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1915  * values from/to the user buffer, treated as an ASCII string.
1916  *
1917  * Returns 0 on success.
1918  */
1919 int proc_dointvec(struct ctl_table *table, int write,
1920                      void __user *buffer, size_t *lenp, loff_t *ppos)
1921 {
1922     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1923                             NULL,NULL);
1924 }
1925
1926 /*
1927  * Taint values can only be increased
1928  * This means we can safely use a temporary.
1929  */
1930 static int proc_taint(struct ctl_table *table, int write,
1931                                void __user *buffer, size_t *lenp, loff_t *ppos)
1932 {
1933         struct ctl_table t;
1934         unsigned long tmptaint = get_taint();
1935         int err;
1936
1937         if (write && !capable(CAP_SYS_ADMIN))
1938                 return -EPERM;
1939
1940         t = *table;
1941         t.data = &tmptaint;
1942         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1943         if (err < 0)
1944                 return err;
1945
1946         if (write) {
1947                 /*
1948                  * Poor man's atomic or. Not worth adding a primitive
1949                  * to everyone's atomic.h for this
1950                  */
1951                 int i;
1952                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1953                         if ((tmptaint >> i) & 1)
1954                                 add_taint(i);
1955                 }
1956         }
1957
1958         return err;
1959 }
1960
1961 #ifdef CONFIG_PRINTK
1962 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1963                                 void __user *buffer, size_t *lenp, loff_t *ppos)
1964 {
1965         if (write && !capable(CAP_SYS_ADMIN))
1966                 return -EPERM;
1967
1968         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1969 }
1970 #endif
1971
1972 struct do_proc_dointvec_minmax_conv_param {
1973         int *min;
1974         int *max;
1975 };
1976
1977 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1978                                         int *valp,
1979                                         int write, void *data)
1980 {
1981         struct do_proc_dointvec_minmax_conv_param *param = data;
1982         if (write) {
1983                 int val = *negp ? -*lvalp : *lvalp;
1984                 if ((param->min && *param->min > val) ||
1985                     (param->max && *param->max < val))
1986                         return -EINVAL;
1987                 *valp = val;
1988         } else {
1989                 int val = *valp;
1990                 if (val < 0) {
1991                         *negp = true;
1992                         *lvalp = (unsigned long)-val;
1993                 } else {
1994                         *negp = false;
1995                         *lvalp = (unsigned long)val;
1996                 }
1997         }
1998         return 0;
1999 }
2000
2001 /**
2002  * proc_dointvec_minmax - read a vector of integers with min/max values
2003  * @table: the sysctl table
2004  * @write: %TRUE if this is a write to the sysctl file
2005  * @buffer: the user buffer
2006  * @lenp: the size of the user buffer
2007  * @ppos: file position
2008  *
2009  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2010  * values from/to the user buffer, treated as an ASCII string.
2011  *
2012  * This routine will ensure the values are within the range specified by
2013  * table->extra1 (min) and table->extra2 (max).
2014  *
2015  * Returns 0 on success.
2016  */
2017 int proc_dointvec_minmax(struct ctl_table *table, int write,
2018                   void __user *buffer, size_t *lenp, loff_t *ppos)
2019 {
2020         struct do_proc_dointvec_minmax_conv_param param = {
2021                 .min = (int *) table->extra1,
2022                 .max = (int *) table->extra2,
2023         };
2024         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2025                                 do_proc_dointvec_minmax_conv, &param);
2026 }
2027
2028 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2029                                      void __user *buffer,
2030                                      size_t *lenp, loff_t *ppos,
2031                                      unsigned long convmul,
2032                                      unsigned long convdiv)
2033 {
2034         unsigned long *i, *min, *max;
2035         int vleft, first = 1, err = 0;
2036         unsigned long page = 0;
2037         size_t left;
2038         char *kbuf;
2039
2040         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2041                 *lenp = 0;
2042                 return 0;
2043         }
2044
2045         i = (unsigned long *) data;
2046         min = (unsigned long *) table->extra1;
2047         max = (unsigned long *) table->extra2;
2048         vleft = table->maxlen / sizeof(unsigned long);
2049         left = *lenp;
2050
2051         if (write) {
2052                 if (left > PAGE_SIZE - 1)
2053                         left = PAGE_SIZE - 1;
2054                 page = __get_free_page(GFP_TEMPORARY);
2055                 kbuf = (char *) page;
2056                 if (!kbuf)
2057                         return -ENOMEM;
2058                 if (copy_from_user(kbuf, buffer, left)) {
2059                         err = -EFAULT;
2060                         goto free;
2061                 }
2062                 kbuf[left] = 0;
2063         }
2064
2065         for (; left && vleft--; i++, first = 0) {
2066                 unsigned long val;
2067
2068                 if (write) {
2069                         bool neg;
2070
2071                         left -= proc_skip_spaces(&kbuf);
2072
2073                         err = proc_get_long(&kbuf, &left, &val, &neg,
2074                                              proc_wspace_sep,
2075                                              sizeof(proc_wspace_sep), NULL);
2076                         if (err)
2077                                 break;
2078                         if (neg)
2079                                 continue;
2080                         if ((min && val < *min) || (max && val > *max))
2081                                 continue;
2082                         *i = val;
2083                 } else {
2084                         val = convdiv * (*i) / convmul;
2085                         if (!first)
2086                                 err = proc_put_char(&buffer, &left, '\t');
2087                         err = proc_put_long(&buffer, &left, val, false);
2088                         if (err)
2089                                 break;
2090                 }
2091         }
2092
2093         if (!write && !first && left && !err)
2094                 err = proc_put_char(&buffer, &left, '\n');
2095         if (write && !err)
2096                 left -= proc_skip_spaces(&kbuf);
2097 free:
2098         if (write) {
2099                 free_page(page);
2100                 if (first)
2101                         return err ? : -EINVAL;
2102         }
2103         *lenp -= left;
2104         *ppos += *lenp;
2105         return err;
2106 }
2107
2108 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2109                                      void __user *buffer,
2110                                      size_t *lenp, loff_t *ppos,
2111                                      unsigned long convmul,
2112                                      unsigned long convdiv)
2113 {
2114         return __do_proc_doulongvec_minmax(table->data, table, write,
2115                         buffer, lenp, ppos, convmul, convdiv);
2116 }
2117
2118 /**
2119  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2120  * @table: the sysctl table
2121  * @write: %TRUE if this is a write to the sysctl file
2122  * @buffer: the user buffer
2123  * @lenp: the size of the user buffer
2124  * @ppos: file position
2125  *
2126  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2127  * values from/to the user buffer, treated as an ASCII string.
2128  *
2129  * This routine will ensure the values are within the range specified by
2130  * table->extra1 (min) and table->extra2 (max).
2131  *
2132  * Returns 0 on success.
2133  */
2134 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2135                            void __user *buffer, size_t *lenp, loff_t *ppos)
2136 {
2137     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2138 }
2139
2140 /**
2141  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2142  * @table: the sysctl table
2143  * @write: %TRUE if this is a write to the sysctl file
2144  * @buffer: the user buffer
2145  * @lenp: the size of the user buffer
2146  * @ppos: file position
2147  *
2148  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2149  * values from/to the user buffer, treated as an ASCII string. The values
2150  * are treated as milliseconds, and converted to jiffies when they are stored.
2151  *
2152  * This routine will ensure the values are within the range specified by
2153  * table->extra1 (min) and table->extra2 (max).
2154  *
2155  * Returns 0 on success.
2156  */
2157 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2158                                       void __user *buffer,
2159                                       size_t *lenp, loff_t *ppos)
2160 {
2161     return do_proc_doulongvec_minmax(table, write, buffer,
2162                                      lenp, ppos, HZ, 1000l);
2163 }
2164
2165
2166 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2167                                          int *valp,
2168                                          int write, void *data)
2169 {
2170         if (write) {
2171                 if (*lvalp > LONG_MAX / HZ)
2172                         return 1;
2173                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2174         } else {
2175                 int val = *valp;
2176                 unsigned long lval;
2177                 if (val < 0) {
2178                         *negp = true;
2179                         lval = (unsigned long)-val;
2180                 } else {
2181                         *negp = false;
2182                         lval = (unsigned long)val;
2183                 }
2184                 *lvalp = lval / HZ;
2185         }
2186         return 0;
2187 }
2188
2189 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2190                                                 int *valp,
2191                                                 int write, void *data)
2192 {
2193         if (write) {
2194                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2195                         return 1;
2196                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2197         } else {
2198                 int val = *valp;
2199                 unsigned long lval;
2200                 if (val < 0) {
2201                         *negp = true;
2202                         lval = (unsigned long)-val;
2203                 } else {
2204                         *negp = false;
2205                         lval = (unsigned long)val;
2206                 }
2207                 *lvalp = jiffies_to_clock_t(lval);
2208         }
2209         return 0;
2210 }
2211
2212 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2213                                             int *valp,
2214                                             int write, void *data)
2215 {
2216         if (write) {
2217                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2218         } else {
2219                 int val = *valp;
2220                 unsigned long lval;
2221                 if (val < 0) {
2222                         *negp = true;
2223                         lval = (unsigned long)-val;
2224                 } else {
2225                         *negp = false;
2226                         lval = (unsigned long)val;
2227                 }
2228                 *lvalp = jiffies_to_msecs(lval);
2229         }
2230         return 0;
2231 }
2232
2233 /**
2234  * proc_dointvec_jiffies - read a vector of integers as seconds
2235  * @table: the sysctl table
2236  * @write: %TRUE if this is a write to the sysctl file
2237  * @buffer: the user buffer
2238  * @lenp: the size of the user buffer
2239  * @ppos: file position
2240  *
2241  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2242  * values from/to the user buffer, treated as an ASCII string.
2243  * The values read are assumed to be in seconds, and are converted into
2244  * jiffies.
2245  *
2246  * Returns 0 on success.
2247  */
2248 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2249                           void __user *buffer, size_t *lenp, loff_t *ppos)
2250 {
2251     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2252                             do_proc_dointvec_jiffies_conv,NULL);
2253 }
2254
2255 /**
2256  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2257  * @table: the sysctl table
2258  * @write: %TRUE if this is a write to the sysctl file
2259  * @buffer: the user buffer
2260  * @lenp: the size of the user buffer
2261  * @ppos: pointer to the file position
2262  *
2263  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2264  * values from/to the user buffer, treated as an ASCII string.
2265  * The values read are assumed to be in 1/USER_HZ seconds, and
2266  * are converted into jiffies.
2267  *
2268  * Returns 0 on success.
2269  */
2270 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2271                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2272 {
2273     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2274                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2275 }
2276
2277 /**
2278  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2279  * @table: the sysctl table
2280  * @write: %TRUE if this is a write to the sysctl file
2281  * @buffer: the user buffer
2282  * @lenp: the size of the user buffer
2283  * @ppos: file position
2284  * @ppos: the current position in the file
2285  *
2286  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2287  * values from/to the user buffer, treated as an ASCII string.
2288  * The values read are assumed to be in 1/1000 seconds, and
2289  * are converted into jiffies.
2290  *
2291  * Returns 0 on success.
2292  */
2293 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2294                              void __user *buffer, size_t *lenp, loff_t *ppos)
2295 {
2296         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2297                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2298 }
2299
2300 static int proc_do_cad_pid(struct ctl_table *table, int write,
2301                            void __user *buffer, size_t *lenp, loff_t *ppos)
2302 {
2303         struct pid *new_pid;
2304         pid_t tmp;
2305         int r;
2306
2307         tmp = pid_vnr(cad_pid);
2308
2309         r = __do_proc_dointvec(&tmp, table, write, buffer,
2310                                lenp, ppos, NULL, NULL);
2311         if (r || !write)
2312                 return r;
2313
2314         new_pid = find_get_pid(tmp);
2315         if (!new_pid)
2316                 return -ESRCH;
2317
2318         put_pid(xchg(&cad_pid, new_pid));
2319         return 0;
2320 }
2321
2322 /**
2323  * proc_do_large_bitmap - read/write from/to a large bitmap
2324  * @table: the sysctl table
2325  * @write: %TRUE if this is a write to the sysctl file
2326  * @buffer: the user buffer
2327  * @lenp: the size of the user buffer
2328  * @ppos: file position
2329  *
2330  * The bitmap is stored at table->data and the bitmap length (in bits)
2331  * in table->maxlen.
2332  *
2333  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2334  * large bitmaps may be represented in a compact manner. Writing into
2335  * the file will clear the bitmap then update it with the given input.
2336  *
2337  * Returns 0 on success.
2338  */
2339 int proc_do_large_bitmap(struct ctl_table *table, int write,
2340                          void __user *buffer, size_t *lenp, loff_t *ppos)
2341 {
2342         int err = 0;
2343         bool first = 1;
2344         size_t left = *lenp;
2345         unsigned long bitmap_len = table->maxlen;
2346         unsigned long *bitmap = (unsigned long *) table->data;
2347         unsigned long *tmp_bitmap = NULL;
2348         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2349
2350         if (!bitmap_len || !left || (*ppos && !write)) {
2351                 *lenp = 0;
2352                 return 0;
2353         }
2354
2355         if (write) {
2356                 unsigned long page = 0;
2357                 char *kbuf;
2358
2359                 if (left > PAGE_SIZE - 1)
2360                         left = PAGE_SIZE - 1;
2361
2362                 page = __get_free_page(GFP_TEMPORARY);
2363                 kbuf = (char *) page;
2364                 if (!kbuf)
2365                         return -ENOMEM;
2366                 if (copy_from_user(kbuf, buffer, left)) {
2367                         free_page(page);
2368                         return -EFAULT;
2369                 }
2370                 kbuf[left] = 0;
2371
2372                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2373                                      GFP_KERNEL);
2374                 if (!tmp_bitmap) {
2375                         free_page(page);
2376                         return -ENOMEM;
2377                 }
2378                 proc_skip_char(&kbuf, &left, '\n');
2379                 while (!err && left) {
2380                         unsigned long val_a, val_b;
2381                         bool neg;
2382
2383                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2384                                              sizeof(tr_a), &c);
2385                         if (err)
2386                                 break;
2387                         if (val_a >= bitmap_len || neg) {
2388                                 err = -EINVAL;
2389                                 break;
2390                         }
2391
2392                         val_b = val_a;
2393                         if (left) {
2394                                 kbuf++;
2395                                 left--;
2396                         }
2397
2398                         if (c == '-') {
2399                                 err = proc_get_long(&kbuf, &left, &val_b,
2400                                                      &neg, tr_b, sizeof(tr_b),
2401                                                      &c);
2402                                 if (err)
2403                                         break;
2404                                 if (val_b >= bitmap_len || neg ||
2405                                     val_a > val_b) {
2406                                         err = -EINVAL;
2407                                         break;
2408                                 }
2409                                 if (left) {
2410                                         kbuf++;
2411                                         left--;
2412                                 }
2413                         }
2414
2415                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2416                         first = 0;
2417                         proc_skip_char(&kbuf, &left, '\n');
2418                 }
2419                 free_page(page);
2420         } else {
2421                 unsigned long bit_a, bit_b = 0;
2422
2423                 while (left) {
2424                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2425                         if (bit_a >= bitmap_len)
2426                                 break;
2427                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2428                                                    bit_a + 1) - 1;
2429
2430                         if (!first) {
2431                                 err = proc_put_char(&buffer, &left, ',');
2432                                 if (err)
2433                                         break;
2434                         }
2435                         err = proc_put_long(&buffer, &left, bit_a, false);
2436                         if (err)
2437                                 break;
2438                         if (bit_a != bit_b) {
2439                                 err = proc_put_char(&buffer, &left, '-');
2440                                 if (err)
2441                                         break;
2442                                 err = proc_put_long(&buffer, &left, bit_b, false);
2443                                 if (err)
2444                                         break;
2445                         }
2446
2447                         first = 0; bit_b++;
2448                 }
2449                 if (!err)
2450                         err = proc_put_char(&buffer, &left, '\n');
2451         }
2452
2453         if (!err) {
2454                 if (write) {
2455                         if (*ppos)
2456                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2457                         else
2458                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2459                 }
2460                 kfree(tmp_bitmap);
2461                 *lenp -= left;
2462                 *ppos += *lenp;
2463                 return 0;
2464         } else {
2465                 kfree(tmp_bitmap);
2466                 return err;
2467         }
2468 }
2469
2470 #else /* CONFIG_PROC_SYSCTL */
2471
2472 int proc_dostring(struct ctl_table *table, int write,
2473                   void __user *buffer, size_t *lenp, loff_t *ppos)
2474 {
2475         return -ENOSYS;
2476 }
2477
2478 int proc_dointvec(struct ctl_table *table, int write,
2479                   void __user *buffer, size_t *lenp, loff_t *ppos)
2480 {
2481         return -ENOSYS;
2482 }
2483
2484 int proc_dointvec_minmax(struct ctl_table *table, int write,
2485                     void __user *buffer, size_t *lenp, loff_t *ppos)
2486 {
2487         return -ENOSYS;
2488 }
2489
2490 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2491                     void __user *buffer, size_t *lenp, loff_t *ppos)
2492 {
2493         return -ENOSYS;
2494 }
2495
2496 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2497                     void __user *buffer, size_t *lenp, loff_t *ppos)
2498 {
2499         return -ENOSYS;
2500 }
2501
2502 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2503                              void __user *buffer, size_t *lenp, loff_t *ppos)
2504 {
2505         return -ENOSYS;
2506 }
2507
2508 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2509                     void __user *buffer, size_t *lenp, loff_t *ppos)
2510 {
2511         return -ENOSYS;
2512 }
2513
2514 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2515                                       void __user *buffer,
2516                                       size_t *lenp, loff_t *ppos)
2517 {
2518     return -ENOSYS;
2519 }
2520
2521
2522 #endif /* CONFIG_PROC_SYSCTL */
2523
2524 /*
2525  * No sense putting this after each symbol definition, twice,
2526  * exception granted :-)
2527  */
2528 EXPORT_SYMBOL(proc_dointvec);
2529 EXPORT_SYMBOL(proc_dointvec_jiffies);
2530 EXPORT_SYMBOL(proc_dointvec_minmax);
2531 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2532 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2533 EXPORT_SYMBOL(proc_dostring);
2534 EXPORT_SYMBOL(proc_doulongvec_minmax);
2535 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);