kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/bitmap.h>
  27 #include <linux/signal.h>
  28 #include <linux/printk.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/security.h>
  31 #include <linux/ctype.h>
  32 #include <linux/kmemcheck.h>
  33 #include <linux/kmemleak.h>
  34 #include <linux/fs.h>
  35 #include <linux/init.h>
  36 #include <linux/kernel.h>
  37 #include <linux/kobject.h>
  38 #include <linux/net.h>
  39 #include <linux/sysrq.h>
  40 #include <linux/highuid.h>
  41 #include <linux/writeback.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/compaction.h>
  44 #include <linux/hugetlb.h>
  45 #include <linux/initrd.h>
  46 #include <linux/key.h>
  47 #include <linux/times.h>
  48 #include <linux/limits.h>
  49 #include <linux/dcache.h>
  50 #include <linux/dnotify.h>
  51 #include <linux/syscalls.h>
  52 #include <linux/vmstat.h>
  53 #include <linux/nfs_fs.h>
  54 #include <linux/acpi.h>
  55 #include <linux/reboot.h>
  56 #include <linux/ftrace.h>
  57 #include <linux/perf_event.h>
  58 #include <linux/kprobes.h>
  59 #include <linux/pipe_fs_i.h>
  60 #include <linux/oom.h>
  61 #include <linux/kmod.h>
  62 #include <linux/capability.h>
  63 #include <linux/binfmts.h>
  64
  65 #include <asm/uaccess.h>
  66 #include <asm/processor.h>
  67
  68 #ifdef CONFIG_X86
  69 #include <asm/nmi.h>
  70 #include <asm/stacktrace.h>
  71 #include <asm/io.h>
  72 #endif
  73 #ifdef CONFIG_SPARC
  74 #include <asm/setup.h>
  75 #endif
  76 #ifdef CONFIG_BSD_PROCESS_ACCT
  77 #include <linux/acct.h>
  78 #endif
  79 #ifdef CONFIG_RT_MUTEXES
  80 #include <linux/rtmutex.h>
  81 #endif
  82 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  83 #include <linux/lockdep.h>
  84 #endif
  85 #ifdef CONFIG_CHR_DEV_SG
  86 #include <scsi/sg.h>
  87 #endif
  88
  89 #ifdef CONFIG_LOCKUP_DETECTOR
  90 #include <linux/nmi.h>
  91 #endif
  92
  93
  94 #if defined(CONFIG_SYSCTL)
  95
  96 /* External variables not in a header file. */
  97 extern int sysctl_overcommit_memory;
  98 extern int sysctl_overcommit_ratio;
  99 extern int max_threads;
 100 extern int core_uses_pid;
 101 extern int suid_dumpable;
 102 extern char core_pattern[];
 103 extern unsigned int core_pipe_limit;
 104 extern int pid_max;
 105 extern int min_free_kbytes;
 106 extern int pid_max_min, pid_max_max;
 107 extern int sysctl_drop_caches;
 108 extern int percpu_pagelist_fraction;
 109 extern int compat_log;
 110 extern int latencytop_enabled;
 111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 112 #ifndef CONFIG_MMU
 113 extern int sysctl_nr_trim_pages;
 114 #endif
 115 #ifdef CONFIG_BLOCK
 116 extern int blk_iopoll_enabled;
 117 #endif
 118
 119 /* Constants used for minimum and  maximum */
 120 #ifdef CONFIG_LOCKUP_DETECTOR
 121 static int sixty = 60;
 122 static int neg_one = -1;
 123 #endif
 124
 125 static int zero;
 126 static int __maybe_unused one = 1;
 127 static int __maybe_unused two = 2;
 128 static int __maybe_unused three = 3;
 129 static unsigned long one_ul = 1;
 130 static int one_hundred = 100;
 131 #ifdef CONFIG_PRINTK
 132 static int ten_thousand = 10000;
 133 #endif
 134
 135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 136 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 137
 138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 139 static int maxolduid = 65535;
 140 static int minolduid;
 141 static int min_percpu_pagelist_fract = 8;
 142
 143 static int ngroups_max = NGROUPS_MAX;
 144 static const int cap_last_cap = CAP_LAST_CAP;
 145
 146 #ifdef CONFIG_INOTIFY_USER
 147 #include <linux/inotify.h>
 148 #endif
 149 #ifdef CONFIG_SPARC
 150 #endif
 151
 152 #ifdef CONFIG_SPARC64
 153 extern int sysctl_tsb_ratio;
 154 #endif
 155
 156 #ifdef __hppa__
 157 extern int pwrsw_enabled;
 158 extern int unaligned_enabled;
 159 #endif
 160
 161 #ifdef CONFIG_IA64
 162 extern int no_unaligned_warning;
 163 extern int unaligned_dump_stack;
 164 #endif
 165
 166 #ifdef CONFIG_PROC_SYSCTL
 167 static int proc_do_cad_pid(struct ctl_table *table, int write,
 168                   void __user *buffer, size_t *lenp, loff_t *ppos);
 169 static int proc_taint(struct ctl_table *table, int write,
 170                                void __user *buffer, size_t *lenp, loff_t *ppos);
 171 #endif
 172
 173 #ifdef CONFIG_PRINTK
 174 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 175                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 176 #endif
 177
 178 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 179                 void __user *buffer, size_t *lenp, loff_t *ppos);
 180 static int proc_dostring_coredump(struct ctl_table *table, int write,
 181                 void __user *buffer, size_t *lenp, loff_t *ppos);
 182
 183 #ifdef CONFIG_MAGIC_SYSRQ
 184 /* Note: sysrq code uses it's own private copy */
 185 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
 186
 187 static int sysrq_sysctl_handler(ctl_table *table, int write,
 188                                 void __user *buffer, size_t *lenp,
 189                                 loff_t *ppos)
 190 {
 191         int error;
 192
 193         error = proc_dointvec(table, write, buffer, lenp, ppos);
 194         if (error)
 195                 return error;
 196
 197         if (write)
 198                 sysrq_toggle_support(__sysrq_enabled);
 199
 200         return 0;
 201 }
 202
 203 #endif
 204
 205 static struct ctl_table kern_table[];
 206 static struct ctl_table vm_table[];
 207 static struct ctl_table fs_table[];
 208 static struct ctl_table debug_table[];
 209 static struct ctl_table dev_table[];
 210 extern struct ctl_table random_table[];
 211 #ifdef CONFIG_EPOLL
 212 extern struct ctl_table epoll_table[];
 213 #endif
 214
 215 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 216 int sysctl_legacy_va_layout;
 217 #endif
 218
 219 /* The default sysctl tables: */
 220
 221 static struct ctl_table sysctl_base_table[] = {
 222         {
 223                 .procname       = "kernel",
 224                 .mode           = 0555,
 225                 .child          = kern_table,
 226         },
 227         {
 228                 .procname       = "vm",
 229                 .mode           = 0555,
 230                 .child          = vm_table,
 231         },
 232         {
 233                 .procname       = "fs",
 234                 .mode           = 0555,
 235                 .child          = fs_table,
 236         },
 237         {
 238                 .procname       = "debug",
 239                 .mode           = 0555,
 240                 .child          = debug_table,
 241         },
 242         {
 243                 .procname       = "dev",
 244                 .mode           = 0555,
 245                 .child          = dev_table,
 246         },
 247         { }
 248 };
 249
 250 #ifdef CONFIG_SCHED_DEBUG
 251 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 252 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 253 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 254 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 255 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 256 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 257 #endif
 258
 259 #ifdef CONFIG_COMPACTION
 260 static int min_extfrag_threshold;
 261 static int max_extfrag_threshold = 1000;
 262 #endif
 263
 264 static struct ctl_table kern_table[] = {
 265         {
 266                 .procname       = "sched_child_runs_first",
 267                 .data           = &sysctl_sched_child_runs_first,
 268                 .maxlen         = sizeof(unsigned int),
 269                 .mode           = 0644,
 270                 .proc_handler   = proc_dointvec,
 271         },
 272 #ifdef CONFIG_SCHED_DEBUG
 273         {
 274                 .procname       = "sched_min_granularity_ns",
 275                 .data           = &sysctl_sched_min_granularity,
 276                 .maxlen         = sizeof(unsigned int),
 277                 .mode           = 0644,
 278                 .proc_handler   = sched_proc_update_handler,
 279                 .extra1         = &min_sched_granularity_ns,
 280                 .extra2         = &max_sched_granularity_ns,
 281         },
 282         {
 283                 .procname       = "sched_latency_ns",
 284                 .data           = &sysctl_sched_latency,
 285                 .maxlen         = sizeof(unsigned int),
 286                 .mode           = 0644,
 287                 .proc_handler   = sched_proc_update_handler,
 288                 .extra1         = &min_sched_granularity_ns,
 289                 .extra2         = &max_sched_granularity_ns,
 290         },
 291         {
 292                 .procname       = "sched_wakeup_granularity_ns",
 293                 .data           = &sysctl_sched_wakeup_granularity,
 294                 .maxlen         = sizeof(unsigned int),
 295                 .mode           = 0644,
 296                 .proc_handler   = sched_proc_update_handler,
 297                 .extra1         = &min_wakeup_granularity_ns,
 298                 .extra2         = &max_wakeup_granularity_ns,
 299         },
 300         {
 301                 .procname       = "sched_tunable_scaling",
 302                 .data           = &sysctl_sched_tunable_scaling,
 303                 .maxlen         = sizeof(enum sched_tunable_scaling),
 304                 .mode           = 0644,
 305                 .proc_handler   = sched_proc_update_handler,
 306                 .extra1         = &min_sched_tunable_scaling,
 307                 .extra2         = &max_sched_tunable_scaling,
 308         },
 309         {
 310                 .procname       = "sched_migration_cost",
 311                 .data           = &sysctl_sched_migration_cost,
 312                 .maxlen         = sizeof(unsigned int),
 313                 .mode           = 0644,
 314                 .proc_handler   = proc_dointvec,
 315         },
 316         {
 317                 .procname       = "sched_nr_migrate",
 318                 .data           = &sysctl_sched_nr_migrate,
 319                 .maxlen         = sizeof(unsigned int),
 320                 .mode           = 0644,
 321                 .proc_handler   = proc_dointvec,
 322         },
 323         {
 324                 .procname       = "sched_time_avg",
 325                 .data           = &sysctl_sched_time_avg,
 326                 .maxlen         = sizeof(unsigned int),
 327                 .mode           = 0644,
 328                 .proc_handler   = proc_dointvec,
 329         },
 330         {
 331                 .procname       = "sched_shares_window",
 332                 .data           = &sysctl_sched_shares_window,
 333                 .maxlen         = sizeof(unsigned int),
 334                 .mode           = 0644,
 335                 .proc_handler   = proc_dointvec,
 336         },
 337         {
 338                 .procname       = "timer_migration",
 339                 .data           = &sysctl_timer_migration,
 340                 .maxlen         = sizeof(unsigned int),
 341                 .mode           = 0644,
 342                 .proc_handler   = proc_dointvec_minmax,
 343                 .extra1         = &zero,
 344                 .extra2         = &one,
 345         },
 346 #endif
 347         {
 348                 .procname       = "sched_rt_period_us",
 349                 .data           = &sysctl_sched_rt_period,
 350                 .maxlen         = sizeof(unsigned int),
 351                 .mode           = 0644,
 352                 .proc_handler   = sched_rt_handler,
 353         },
 354         {
 355                 .procname       = "sched_rt_runtime_us",
 356                 .data           = &sysctl_sched_rt_runtime,
 357                 .maxlen         = sizeof(int),
 358                 .mode           = 0644,
 359                 .proc_handler   = sched_rt_handler,
 360         },
 361 #ifdef CONFIG_SCHED_AUTOGROUP
 362         {
 363                 .procname       = "sched_autogroup_enabled",
 364                 .data           = &sysctl_sched_autogroup_enabled,
 365                 .maxlen         = sizeof(unsigned int),
 366                 .mode           = 0644,
 367                 .proc_handler   = proc_dointvec_minmax,
 368                 .extra1         = &zero,
 369                 .extra2         = &one,
 370         },
 371 #endif
 372 #ifdef CONFIG_CFS_BANDWIDTH
 373         {
 374                 .procname       = "sched_cfs_bandwidth_slice_us",
 375                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 376                 .maxlen         = sizeof(unsigned int),
 377                 .mode           = 0644,
 378                 .proc_handler   = proc_dointvec_minmax,
 379                 .extra1         = &one,
 380         },
 381 #endif
 382 #ifdef CONFIG_PROVE_LOCKING
 383         {
 384                 .procname       = "prove_locking",
 385                 .data           = &prove_locking,
 386                 .maxlen         = sizeof(int),
 387                 .mode           = 0644,
 388                 .proc_handler   = proc_dointvec,
 389         },
 390 #endif
 391 #ifdef CONFIG_LOCK_STAT
 392         {
 393                 .procname       = "lock_stat",
 394                 .data           = &lock_stat,
 395                 .maxlen         = sizeof(int),
 396                 .mode           = 0644,
 397                 .proc_handler   = proc_dointvec,
 398         },
 399 #endif
 400         {
 401                 .procname       = "panic",
 402                 .data           = &panic_timeout,
 403                 .maxlen         = sizeof(int),
 404                 .mode           = 0644,
 405                 .proc_handler   = proc_dointvec,
 406         },
 407         {
 408                 .procname       = "core_uses_pid",
 409                 .data           = &core_uses_pid,
 410                 .maxlen         = sizeof(int),
 411                 .mode           = 0644,
 412                 .proc_handler   = proc_dointvec,
 413         },
 414         {
 415                 .procname       = "core_pattern",
 416                 .data           = core_pattern,
 417                 .maxlen         = CORENAME_MAX_SIZE,
 418                 .mode           = 0644,
 419                 .proc_handler   = proc_dostring_coredump,
 420         },
 421         {
 422                 .procname       = "core_pipe_limit",
 423                 .data           = &core_pipe_limit,
 424                 .maxlen         = sizeof(unsigned int),
 425                 .mode           = 0644,
 426                 .proc_handler   = proc_dointvec,
 427         },
 428 #ifdef CONFIG_PROC_SYSCTL
 429         {
 430                 .procname       = "tainted",
 431                 .maxlen         = sizeof(long),
 432                 .mode           = 0644,
 433                 .proc_handler   = proc_taint,
 434         },
 435 #endif
 436 #ifdef CONFIG_LATENCYTOP
 437         {
 438                 .procname       = "latencytop",
 439                 .data           = &latencytop_enabled,
 440                 .maxlen         = sizeof(int),
 441                 .mode           = 0644,
 442                 .proc_handler   = proc_dointvec,
 443         },
 444 #endif
 445 #ifdef CONFIG_BLK_DEV_INITRD
 446         {
 447                 .procname       = "real-root-dev",
 448                 .data           = &real_root_dev,
 449                 .maxlen         = sizeof(int),
 450                 .mode           = 0644,
 451                 .proc_handler   = proc_dointvec,
 452         },
 453 #endif
 454         {
 455                 .procname       = "print-fatal-signals",
 456                 .data           = &print_fatal_signals,
 457                 .maxlen         = sizeof(int),
 458                 .mode           = 0644,
 459                 .proc_handler   = proc_dointvec,
 460         },
 461 #ifdef CONFIG_SPARC
 462         {
 463                 .procname       = "reboot-cmd",
 464                 .data           = reboot_command,
 465                 .maxlen         = 256,
 466                 .mode           = 0644,
 467                 .proc_handler   = proc_dostring,
 468         },
 469         {
 470                 .procname       = "stop-a",
 471                 .data           = &stop_a_enabled,
 472                 .maxlen         = sizeof (int),
 473                 .mode           = 0644,
 474                 .proc_handler   = proc_dointvec,
 475         },
 476         {
 477                 .procname       = "scons-poweroff",
 478                 .data           = &scons_pwroff,
 479                 .maxlen         = sizeof (int),
 480                 .mode           = 0644,
 481                 .proc_handler   = proc_dointvec,
 482         },
 483 #endif
 484 #ifdef CONFIG_SPARC64
 485         {
 486                 .procname       = "tsb-ratio",
 487                 .data           = &sysctl_tsb_ratio,
 488                 .maxlen         = sizeof (int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec,
 491         },
 492 #endif
 493 #ifdef __hppa__
 494         {
 495                 .procname       = "soft-power",
 496                 .data           = &pwrsw_enabled,
 497                 .maxlen         = sizeof (int),
 498                 .mode           = 0644,
 499                 .proc_handler   = proc_dointvec,
 500         },
 501         {
 502                 .procname       = "unaligned-trap",
 503                 .data           = &unaligned_enabled,
 504                 .maxlen         = sizeof (int),
 505                 .mode           = 0644,
 506                 .proc_handler   = proc_dointvec,
 507         },
 508 #endif
 509         {
 510                 .procname       = "ctrl-alt-del",
 511                 .data           = &C_A_D,
 512                 .maxlen         = sizeof(int),
 513                 .mode           = 0644,
 514                 .proc_handler   = proc_dointvec,
 515         },
 516 #ifdef CONFIG_FUNCTION_TRACER
 517         {
 518                 .procname       = "ftrace_enabled",
 519                 .data           = &ftrace_enabled,
 520                 .maxlen         = sizeof(int),
 521                 .mode           = 0644,
 522                 .proc_handler   = ftrace_enable_sysctl,
 523         },
 524 #endif
 525 #ifdef CONFIG_STACK_TRACER
 526         {
 527                 .procname       = "stack_tracer_enabled",
 528                 .data           = &stack_tracer_enabled,
 529                 .maxlen         = sizeof(int),
 530                 .mode           = 0644,
 531                 .proc_handler   = stack_trace_sysctl,
 532         },
 533 #endif
 534 #ifdef CONFIG_TRACING
 535         {
 536                 .procname       = "ftrace_dump_on_oops",
 537                 .data           = &ftrace_dump_on_oops,
 538                 .maxlen         = sizeof(int),
 539                 .mode           = 0644,
 540                 .proc_handler   = proc_dointvec,
 541         },
 542 #endif
 543 #ifdef CONFIG_MODULES
 544         {
 545                 .procname       = "modprobe",
 546                 .data           = &modprobe_path,
 547                 .maxlen         = KMOD_PATH_LEN,
 548                 .mode           = 0644,
 549                 .proc_handler   = proc_dostring,
 550         },
 551         {
 552                 .procname       = "modules_disabled",
 553                 .data           = &modules_disabled,
 554                 .maxlen         = sizeof(int),
 555                 .mode           = 0644,
 556                 /* only handle a transition from default "0" to "1" */
 557                 .proc_handler   = proc_dointvec_minmax,
 558                 .extra1         = &one,
 559                 .extra2         = &one,
 560         },
 561 #endif
 562 #ifdef CONFIG_HOTPLUG
 563         {
 564                 .procname       = "hotplug",
 565                 .data           = &uevent_helper,
 566                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 567                 .mode           = 0644,
 568                 .proc_handler   = proc_dostring,
 569         },
 570 #endif
 571 #ifdef CONFIG_CHR_DEV_SG
 572         {
 573                 .procname       = "sg-big-buff",
 574                 .data           = &sg_big_buff,
 575                 .maxlen         = sizeof (int),
 576                 .mode           = 0444,
 577                 .proc_handler   = proc_dointvec,
 578         },
 579 #endif
 580 #ifdef CONFIG_BSD_PROCESS_ACCT
 581         {
 582                 .procname       = "acct",
 583                 .data           = &acct_parm,
 584                 .maxlen         = 3*sizeof(int),
 585                 .mode           = 0644,
 586                 .proc_handler   = proc_dointvec,
 587         },
 588 #endif
 589 #ifdef CONFIG_MAGIC_SYSRQ
 590         {
 591                 .procname       = "sysrq",
 592                 .data           = &__sysrq_enabled,
 593                 .maxlen         = sizeof (int),
 594                 .mode           = 0644,
 595                 .proc_handler   = sysrq_sysctl_handler,
 596         },
 597 #endif
 598 #ifdef CONFIG_PROC_SYSCTL
 599         {
 600                 .procname       = "cad_pid",
 601                 .data           = NULL,
 602                 .maxlen         = sizeof (int),
 603                 .mode           = 0600,
 604                 .proc_handler   = proc_do_cad_pid,
 605         },
 606 #endif
 607         {
 608                 .procname       = "threads-max",
 609                 .data           = &max_threads,
 610                 .maxlen         = sizeof(int),
 611                 .mode           = 0644,
 612                 .proc_handler   = proc_dointvec,
 613         },
 614         {
 615                 .procname       = "random",
 616                 .mode           = 0555,
 617                 .child          = random_table,
 618         },
 619         {
 620                 .procname       = "usermodehelper",
 621                 .mode           = 0555,
 622                 .child          = usermodehelper_table,
 623         },
 624         {
 625                 .procname       = "overflowuid",
 626                 .data           = &overflowuid,
 627                 .maxlen         = sizeof(int),
 628                 .mode           = 0644,
 629                 .proc_handler   = proc_dointvec_minmax,
 630                 .extra1         = &minolduid,
 631                 .extra2         = &maxolduid,
 632         },
 633         {
 634                 .procname       = "overflowgid",
 635                 .data           = &overflowgid,
 636                 .maxlen         = sizeof(int),
 637                 .mode           = 0644,
 638                 .proc_handler   = proc_dointvec_minmax,
 639                 .extra1         = &minolduid,
 640                 .extra2         = &maxolduid,
 641         },
 642 #ifdef CONFIG_S390
 643 #ifdef CONFIG_MATHEMU
 644         {
 645                 .procname       = "ieee_emulation_warnings",
 646                 .data           = &sysctl_ieee_emulation_warnings,
 647                 .maxlen         = sizeof(int),
 648                 .mode           = 0644,
 649                 .proc_handler   = proc_dointvec,
 650         },
 651 #endif
 652         {
 653                 .procname       = "userprocess_debug",
 654                 .data           = &show_unhandled_signals,
 655                 .maxlen         = sizeof(int),
 656                 .mode           = 0644,
 657                 .proc_handler   = proc_dointvec,
 658         },
 659 #endif
 660         {
 661                 .procname       = "pid_max",
 662                 .data           = &pid_max,
 663                 .maxlen         = sizeof (int),
 664                 .mode           = 0644,
 665                 .proc_handler   = proc_dointvec_minmax,
 666                 .extra1         = &pid_max_min,
 667                 .extra2         = &pid_max_max,
 668         },
 669         {
 670                 .procname       = "panic_on_oops",
 671                 .data           = &panic_on_oops,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = proc_dointvec,
 675         },
 676 #if defined CONFIG_PRINTK
 677         {
 678                 .procname       = "printk",
 679                 .data           = &console_loglevel,
 680                 .maxlen         = 4*sizeof(int),
 681                 .mode           = 0644,
 682                 .proc_handler   = proc_dointvec,
 683         },
 684         {
 685                 .procname       = "printk_ratelimit",
 686                 .data           = &printk_ratelimit_state.interval,
 687                 .maxlen         = sizeof(int),
 688                 .mode           = 0644,
 689                 .proc_handler   = proc_dointvec_jiffies,
 690         },
 691         {
 692                 .procname       = "printk_ratelimit_burst",
 693                 .data           = &printk_ratelimit_state.burst,
 694                 .maxlen         = sizeof(int),
 695                 .mode           = 0644,
 696                 .proc_handler   = proc_dointvec,
 697         },
 698         {
 699                 .procname       = "printk_delay",
 700                 .data           = &printk_delay_msec,
 701                 .maxlen         = sizeof(int),
 702                 .mode           = 0644,
 703                 .proc_handler   = proc_dointvec_minmax,
 704                 .extra1         = &zero,
 705                 .extra2         = &ten_thousand,
 706         },
 707         {
 708                 .procname       = "dmesg_restrict",
 709                 .data           = &dmesg_restrict,
 710                 .maxlen         = sizeof(int),
 711                 .mode           = 0644,
 712                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 713                 .extra1         = &zero,
 714                 .extra2         = &one,
 715         },
 716         {
 717                 .procname       = "kptr_restrict",
 718                 .data           = &kptr_restrict,
 719                 .maxlen         = sizeof(int),
 720                 .mode           = 0644,
 721                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 722                 .extra1         = &zero,
 723                 .extra2         = &two,
 724         },
 725 #endif
 726         {
 727                 .procname       = "ngroups_max",
 728                 .data           = &ngroups_max,
 729                 .maxlen         = sizeof (int),
 730                 .mode           = 0444,
 731                 .proc_handler   = proc_dointvec,
 732         },
 733         {
 734                 .procname       = "cap_last_cap",
 735                 .data           = (void *)&cap_last_cap,
 736                 .maxlen         = sizeof(int),
 737                 .mode           = 0444,
 738                 .proc_handler   = proc_dointvec,
 739         },
 740 #if defined(CONFIG_LOCKUP_DETECTOR)
 741         {
 742                 .procname       = "watchdog",
 743                 .data           = &watchdog_enabled,
 744                 .maxlen         = sizeof (int),
 745                 .mode           = 0644,
 746                 .proc_handler   = proc_dowatchdog,
 747                 .extra1         = &zero,
 748                 .extra2         = &one,
 749         },
 750         {
 751                 .procname       = "watchdog_thresh",
 752                 .data           = &watchdog_thresh,
 753                 .maxlen         = sizeof(int),
 754                 .mode           = 0644,
 755                 .proc_handler   = proc_dowatchdog,
 756                 .extra1         = &neg_one,
 757                 .extra2         = &sixty,
 758         },
 759         {
 760                 .procname       = "softlockup_panic",
 761                 .data           = &softlockup_panic,
 762                 .maxlen         = sizeof(int),
 763                 .mode           = 0644,
 764                 .proc_handler   = proc_dointvec_minmax,
 765                 .extra1         = &zero,
 766                 .extra2         = &one,
 767         },
 768         {
 769                 .procname       = "nmi_watchdog",
 770                 .data           = &watchdog_enabled,
 771                 .maxlen         = sizeof (int),
 772                 .mode           = 0644,
 773                 .proc_handler   = proc_dowatchdog,
 774                 .extra1         = &zero,
 775                 .extra2         = &one,
 776         },
 777 #endif
 778 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 779         {
 780                 .procname       = "unknown_nmi_panic",
 781                 .data           = &unknown_nmi_panic,
 782                 .maxlen         = sizeof (int),
 783                 .mode           = 0644,
 784                 .proc_handler   = proc_dointvec,
 785         },
 786 #endif
 787 #if defined(CONFIG_X86)
 788         {
 789                 .procname       = "panic_on_unrecovered_nmi",
 790                 .data           = &panic_on_unrecovered_nmi,
 791                 .maxlen         = sizeof(int),
 792                 .mode           = 0644,
 793                 .proc_handler   = proc_dointvec,
 794         },
 795         {
 796                 .procname       = "panic_on_io_nmi",
 797                 .data           = &panic_on_io_nmi,
 798                 .maxlen         = sizeof(int),
 799                 .mode           = 0644,
 800                 .proc_handler   = proc_dointvec,
 801         },
 802 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 803         {
 804                 .procname       = "panic_on_stackoverflow",
 805                 .data           = &sysctl_panic_on_stackoverflow,
 806                 .maxlen         = sizeof(int),
 807                 .mode           = 0644,
 808                 .proc_handler   = proc_dointvec,
 809         },
 810 #endif
 811         {
 812                 .procname       = "bootloader_type",
 813                 .data           = &bootloader_type,
 814                 .maxlen         = sizeof (int),
 815                 .mode           = 0444,
 816                 .proc_handler   = proc_dointvec,
 817         },
 818         {
 819                 .procname       = "bootloader_version",
 820                 .data           = &bootloader_version,
 821                 .maxlen         = sizeof (int),
 822                 .mode           = 0444,
 823                 .proc_handler   = proc_dointvec,
 824         },
 825         {
 826                 .procname       = "kstack_depth_to_print",
 827                 .data           = &kstack_depth_to_print,
 828                 .maxlen         = sizeof(int),
 829                 .mode           = 0644,
 830                 .proc_handler   = proc_dointvec,
 831         },
 832         {
 833                 .procname       = "io_delay_type",
 834                 .data           = &io_delay_type,
 835                 .maxlen         = sizeof(int),
 836                 .mode           = 0644,
 837                 .proc_handler   = proc_dointvec,
 838         },
 839 #endif
 840 #if defined(CONFIG_MMU)
 841         {
 842                 .procname       = "randomize_va_space",
 843                 .data           = &randomize_va_space,
 844                 .maxlen         = sizeof(int),
 845                 .mode           = 0644,
 846                 .proc_handler   = proc_dointvec,
 847         },
 848 #endif
 849 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 850         {
 851                 .procname       = "spin_retry",
 852                 .data           = &spin_retry,
 853                 .maxlen         = sizeof (int),
 854                 .mode           = 0644,
 855                 .proc_handler   = proc_dointvec,
 856         },
 857 #endif
 858 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 859         {
 860                 .procname       = "acpi_video_flags",
 861                 .data           = &acpi_realmode_flags,
 862                 .maxlen         = sizeof (unsigned long),
 863                 .mode           = 0644,
 864                 .proc_handler   = proc_doulongvec_minmax,
 865         },
 866 #endif
 867 #ifdef CONFIG_IA64
 868         {
 869                 .procname       = "ignore-unaligned-usertrap",
 870                 .data           = &no_unaligned_warning,
 871                 .maxlen         = sizeof (int),
 872                 .mode           = 0644,
 873                 .proc_handler   = proc_dointvec,
 874         },
 875         {
 876                 .procname       = "unaligned-dump-stack",
 877                 .data           = &unaligned_dump_stack,
 878                 .maxlen         = sizeof (int),
 879                 .mode           = 0644,
 880                 .proc_handler   = proc_dointvec,
 881         },
 882 #endif
 883 #ifdef CONFIG_DETECT_HUNG_TASK
 884         {
 885                 .procname       = "hung_task_panic",
 886                 .data           = &sysctl_hung_task_panic,
 887                 .maxlen         = sizeof(int),
 888                 .mode           = 0644,
 889                 .proc_handler   = proc_dointvec_minmax,
 890                 .extra1         = &zero,
 891                 .extra2         = &one,
 892         },
 893         {
 894                 .procname       = "hung_task_check_count",
 895                 .data           = &sysctl_hung_task_check_count,
 896                 .maxlen         = sizeof(unsigned long),
 897                 .mode           = 0644,
 898                 .proc_handler   = proc_doulongvec_minmax,
 899         },
 900         {
 901                 .procname       = "hung_task_timeout_secs",
 902                 .data           = &sysctl_hung_task_timeout_secs,
 903                 .maxlen         = sizeof(unsigned long),
 904                 .mode           = 0644,
 905                 .proc_handler   = proc_dohung_task_timeout_secs,
 906         },
 907         {
 908                 .procname       = "hung_task_warnings",
 909                 .data           = &sysctl_hung_task_warnings,
 910                 .maxlen         = sizeof(unsigned long),
 911                 .mode           = 0644,
 912                 .proc_handler   = proc_doulongvec_minmax,
 913         },
 914 #endif
 915 #ifdef CONFIG_COMPAT
 916         {
 917                 .procname       = "compat-log",
 918                 .data           = &compat_log,
 919                 .maxlen         = sizeof (int),
 920                 .mode           = 0644,
 921                 .proc_handler   = proc_dointvec,
 922         },
 923 #endif
 924 #ifdef CONFIG_RT_MUTEXES
 925         {
 926                 .procname       = "max_lock_depth",
 927                 .data           = &max_lock_depth,
 928                 .maxlen         = sizeof(int),
 929                 .mode           = 0644,
 930                 .proc_handler   = proc_dointvec,
 931         },
 932 #endif
 933         {
 934                 .procname       = "poweroff_cmd",
 935                 .data           = &poweroff_cmd,
 936                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 937                 .mode           = 0644,
 938                 .proc_handler   = proc_dostring,
 939         },
 940 #ifdef CONFIG_KEYS
 941         {
 942                 .procname       = "keys",
 943                 .mode           = 0555,
 944                 .child          = key_sysctls,
 945         },
 946 #endif
 947 #ifdef CONFIG_RCU_TORTURE_TEST
 948         {
 949                 .procname       = "rcutorture_runnable",
 950                 .data           = &rcutorture_runnable,
 951                 .maxlen         = sizeof(int),
 952                 .mode           = 0644,
 953                 .proc_handler   = proc_dointvec,
 954         },
 955 #endif
 956 #ifdef CONFIG_PERF_EVENTS
 957         /*
 958          * User-space scripts rely on the existence of this file
 959          * as a feature check for perf_events being enabled.
 960          *
 961          * So it's an ABI, do not remove!
 962          */
 963         {
 964                 .procname       = "perf_event_paranoid",
 965                 .data           = &sysctl_perf_event_paranoid,
 966                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
 967                 .mode           = 0644,
 968                 .proc_handler   = proc_dointvec,
 969         },
 970         {
 971                 .procname       = "perf_event_mlock_kb",
 972                 .data           = &sysctl_perf_event_mlock,
 973                 .maxlen         = sizeof(sysctl_perf_event_mlock),
 974                 .mode           = 0644,
 975                 .proc_handler   = proc_dointvec,
 976         },
 977         {
 978                 .procname       = "perf_event_max_sample_rate",
 979                 .data           = &sysctl_perf_event_sample_rate,
 980                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
 981                 .mode           = 0644,
 982                 .proc_handler   = perf_proc_update_handler,
 983         },
 984 #endif
 985 #ifdef CONFIG_KMEMCHECK
 986         {
 987                 .procname       = "kmemcheck",
 988                 .data           = &kmemcheck_enabled,
 989                 .maxlen         = sizeof(int),
 990                 .mode           = 0644,
 991                 .proc_handler   = proc_dointvec,
 992         },
 993 #endif
 994 #ifdef CONFIG_BLOCK
 995         {
 996                 .procname       = "blk_iopoll",
 997                 .data           = &blk_iopoll_enabled,
 998                 .maxlen         = sizeof(int),
 999                 .mode           = 0644,
1000                 .proc_handler   = proc_dointvec,
1001         },
1002 #endif
1003         { }
1004 };
1005
1006 static struct ctl_table vm_table[] = {
1007         {
1008                 .procname       = "overcommit_memory",
1009                 .data           = &sysctl_overcommit_memory,
1010                 .maxlen         = sizeof(sysctl_overcommit_memory),
1011                 .mode           = 0644,
1012                 .proc_handler   = proc_dointvec_minmax,
1013                 .extra1         = &zero,
1014                 .extra2         = &two,
1015         },
1016         {
1017                 .procname       = "panic_on_oom",
1018                 .data           = &sysctl_panic_on_oom,
1019                 .maxlen         = sizeof(sysctl_panic_on_oom),
1020                 .mode           = 0644,
1021                 .proc_handler   = proc_dointvec_minmax,
1022                 .extra1         = &zero,
1023                 .extra2         = &two,
1024         },
1025         {
1026                 .procname       = "oom_kill_allocating_task",
1027                 .data           = &sysctl_oom_kill_allocating_task,
1028                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1029                 .mode           = 0644,
1030                 .proc_handler   = proc_dointvec,
1031         },
1032         {
1033                 .procname       = "oom_dump_tasks",
1034                 .data           = &sysctl_oom_dump_tasks,
1035                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1036                 .mode           = 0644,
1037                 .proc_handler   = proc_dointvec,
1038         },
1039         {
1040                 .procname       = "overcommit_ratio",
1041                 .data           = &sysctl_overcommit_ratio,
1042                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1043                 .mode           = 0644,
1044                 .proc_handler   = proc_dointvec,
1045         },
1046         {
1047                 .procname       = "page-cluster",
1048                 .data           = &page_cluster,
1049                 .maxlen         = sizeof(int),
1050                 .mode           = 0644,
1051                 .proc_handler   = proc_dointvec_minmax,
1052                 .extra1         = &zero,
1053         },
1054         {
1055                 .procname       = "dirty_background_ratio",
1056                 .data           = &dirty_background_ratio,
1057                 .maxlen         = sizeof(dirty_background_ratio),
1058                 .mode           = 0644,
1059                 .proc_handler   = dirty_background_ratio_handler,
1060                 .extra1         = &zero,
1061                 .extra2         = &one_hundred,
1062         },
1063         {
1064                 .procname       = "dirty_background_bytes",
1065                 .data           = &dirty_background_bytes,
1066                 .maxlen         = sizeof(dirty_background_bytes),
1067                 .mode           = 0644,
1068                 .proc_handler   = dirty_background_bytes_handler,
1069                 .extra1         = &one_ul,
1070         },
1071         {
1072                 .procname       = "dirty_ratio",
1073                 .data           = &vm_dirty_ratio,
1074                 .maxlen         = sizeof(vm_dirty_ratio),
1075                 .mode           = 0644,
1076                 .proc_handler   = dirty_ratio_handler,
1077                 .extra1         = &zero,
1078                 .extra2         = &one_hundred,
1079         },
1080         {
1081                 .procname       = "dirty_bytes",
1082                 .data           = &vm_dirty_bytes,
1083                 .maxlen         = sizeof(vm_dirty_bytes),
1084                 .mode           = 0644,
1085                 .proc_handler   = dirty_bytes_handler,
1086                 .extra1         = &dirty_bytes_min,
1087         },
1088         {
1089                 .procname       = "dirty_writeback_centisecs",
1090                 .data           = &dirty_writeback_interval,
1091                 .maxlen         = sizeof(dirty_writeback_interval),
1092                 .mode           = 0644,
1093                 .proc_handler   = dirty_writeback_centisecs_handler,
1094         },
1095         {
1096                 .procname       = "dirty_expire_centisecs",
1097                 .data           = &dirty_expire_interval,
1098                 .maxlen         = sizeof(dirty_expire_interval),
1099                 .mode           = 0644,
1100                 .proc_handler   = proc_dointvec_minmax,
1101                 .extra1         = &zero,
1102         },
1103         {
1104                 .procname       = "nr_pdflush_threads",
1105                 .mode           = 0444 /* read-only */,
1106                 .proc_handler   = pdflush_proc_obsolete,
1107         },
1108         {
1109                 .procname       = "swappiness",
1110                 .data           = &vm_swappiness,
1111                 .maxlen         = sizeof(vm_swappiness),
1112                 .mode           = 0644,
1113                 .proc_handler   = proc_dointvec_minmax,
1114                 .extra1         = &zero,
1115                 .extra2         = &one_hundred,
1116         },
1117 #ifdef CONFIG_HUGETLB_PAGE
1118         {
1119                 .procname       = "nr_hugepages",
1120                 .data           = NULL,
1121                 .maxlen         = sizeof(unsigned long),
1122                 .mode           = 0644,
1123                 .proc_handler   = hugetlb_sysctl_handler,
1124                 .extra1         = (void *)&hugetlb_zero,
1125                 .extra2         = (void *)&hugetlb_infinity,
1126         },
1127 #ifdef CONFIG_NUMA
1128         {
1129                 .procname       = "nr_hugepages_mempolicy",
1130                 .data           = NULL,
1131                 .maxlen         = sizeof(unsigned long),
1132                 .mode           = 0644,
1133                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1134                 .extra1         = (void *)&hugetlb_zero,
1135                 .extra2         = (void *)&hugetlb_infinity,
1136         },
1137 #endif
1138          {
1139                 .procname       = "hugetlb_shm_group",
1140                 .data           = &sysctl_hugetlb_shm_group,
1141                 .maxlen         = sizeof(gid_t),
1142                 .mode           = 0644,
1143                 .proc_handler   = proc_dointvec,
1144          },
1145          {
1146                 .procname       = "hugepages_treat_as_movable",
1147                 .data           = &hugepages_treat_as_movable,
1148                 .maxlen         = sizeof(int),
1149                 .mode           = 0644,
1150                 .proc_handler   = hugetlb_treat_movable_handler,
1151         },
1152         {
1153                 .procname       = "nr_overcommit_hugepages",
1154                 .data           = NULL,
1155                 .maxlen         = sizeof(unsigned long),
1156                 .mode           = 0644,
1157                 .proc_handler   = hugetlb_overcommit_handler,
1158                 .extra1         = (void *)&hugetlb_zero,
1159                 .extra2         = (void *)&hugetlb_infinity,
1160         },
1161 #endif
1162         {
1163                 .procname       = "lowmem_reserve_ratio",
1164                 .data           = &sysctl_lowmem_reserve_ratio,
1165                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1166                 .mode           = 0644,
1167                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1168         },
1169         {
1170                 .procname       = "drop_caches",
1171                 .data           = &sysctl_drop_caches,
1172                 .maxlen         = sizeof(int),
1173                 .mode           = 0644,
1174                 .proc_handler   = drop_caches_sysctl_handler,
1175                 .extra1         = &one,
1176                 .extra2         = &three,
1177         },
1178 #ifdef CONFIG_COMPACTION
1179         {
1180                 .procname       = "compact_memory",
1181                 .data           = &sysctl_compact_memory,
1182                 .maxlen         = sizeof(int),
1183                 .mode           = 0200,
1184                 .proc_handler   = sysctl_compaction_handler,
1185         },
1186         {
1187                 .procname       = "extfrag_threshold",
1188                 .data           = &sysctl_extfrag_threshold,
1189                 .maxlen         = sizeof(int),
1190                 .mode           = 0644,
1191                 .proc_handler   = sysctl_extfrag_handler,
1192                 .extra1         = &min_extfrag_threshold,
1193                 .extra2         = &max_extfrag_threshold,
1194         },
1195
1196 #endif /* CONFIG_COMPACTION */
1197         {
1198                 .procname       = "min_free_kbytes",
1199                 .data           = &min_free_kbytes,
1200                 .maxlen         = sizeof(min_free_kbytes),
1201                 .mode           = 0644,
1202                 .proc_handler   = min_free_kbytes_sysctl_handler,
1203                 .extra1         = &zero,
1204         },
1205         {
1206                 .procname       = "percpu_pagelist_fraction",
1207                 .data           = &percpu_pagelist_fraction,
1208                 .maxlen         = sizeof(percpu_pagelist_fraction),
1209                 .mode           = 0644,
1210                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1211                 .extra1         = &min_percpu_pagelist_fract,
1212         },
1213 #ifdef CONFIG_MMU
1214         {
1215                 .procname       = "max_map_count",
1216                 .data           = &sysctl_max_map_count,
1217                 .maxlen         = sizeof(sysctl_max_map_count),
1218                 .mode           = 0644,
1219                 .proc_handler   = proc_dointvec_minmax,
1220                 .extra1         = &zero,
1221         },
1222 #else
1223         {
1224                 .procname       = "nr_trim_pages",
1225                 .data           = &sysctl_nr_trim_pages,
1226                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1227                 .mode           = 0644,
1228                 .proc_handler   = proc_dointvec_minmax,
1229                 .extra1         = &zero,
1230         },
1231 #endif
1232         {
1233                 .procname       = "laptop_mode",
1234                 .data           = &laptop_mode,
1235                 .maxlen         = sizeof(laptop_mode),
1236                 .mode           = 0644,
1237                 .proc_handler   = proc_dointvec_jiffies,
1238         },
1239         {
1240                 .procname       = "block_dump",
1241                 .data           = &block_dump,
1242                 .maxlen         = sizeof(block_dump),
1243                 .mode           = 0644,
1244                 .proc_handler   = proc_dointvec,
1245                 .extra1         = &zero,
1246         },
1247         {
1248                 .procname       = "vfs_cache_pressure",
1249                 .data           = &sysctl_vfs_cache_pressure,
1250                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1251                 .mode           = 0644,
1252                 .proc_handler   = proc_dointvec,
1253                 .extra1         = &zero,
1254         },
1255 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1256         {
1257                 .procname       = "legacy_va_layout",
1258                 .data           = &sysctl_legacy_va_layout,
1259                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1260                 .mode           = 0644,
1261                 .proc_handler   = proc_dointvec,
1262                 .extra1         = &zero,
1263         },
1264 #endif
1265 #ifdef CONFIG_NUMA
1266         {
1267                 .procname       = "zone_reclaim_mode",
1268                 .data           = &zone_reclaim_mode,
1269                 .maxlen         = sizeof(zone_reclaim_mode),
1270                 .mode           = 0644,
1271                 .proc_handler   = proc_dointvec,
1272                 .extra1         = &zero,
1273         },
1274         {
1275                 .procname       = "min_unmapped_ratio",
1276                 .data           = &sysctl_min_unmapped_ratio,
1277                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1278                 .mode           = 0644,
1279                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1280                 .extra1         = &zero,
1281                 .extra2         = &one_hundred,
1282         },
1283         {
1284                 .procname       = "min_slab_ratio",
1285                 .data           = &sysctl_min_slab_ratio,
1286                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1287                 .mode           = 0644,
1288                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1289                 .extra1         = &zero,
1290                 .extra2         = &one_hundred,
1291         },
1292 #endif
1293 #ifdef CONFIG_SMP
1294         {
1295                 .procname       = "stat_interval",
1296                 .data           = &sysctl_stat_interval,
1297                 .maxlen         = sizeof(sysctl_stat_interval),
1298                 .mode           = 0644,
1299                 .proc_handler   = proc_dointvec_jiffies,
1300         },
1301 #endif
1302 #ifdef CONFIG_MMU
1303         {
1304                 .procname       = "mmap_min_addr",
1305                 .data           = &dac_mmap_min_addr,
1306                 .maxlen         = sizeof(unsigned long),
1307                 .mode           = 0644,
1308                 .proc_handler   = mmap_min_addr_handler,
1309         },
1310 #endif
1311 #ifdef CONFIG_NUMA
1312         {
1313                 .procname       = "numa_zonelist_order",
1314                 .data           = &numa_zonelist_order,
1315                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1316                 .mode           = 0644,
1317                 .proc_handler   = numa_zonelist_order_handler,
1318         },
1319 #endif
1320 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1321    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1322         {
1323                 .procname       = "vdso_enabled",
1324                 .data           = &vdso_enabled,
1325                 .maxlen         = sizeof(vdso_enabled),
1326                 .mode           = 0644,
1327                 .proc_handler   = proc_dointvec,
1328                 .extra1         = &zero,
1329         },
1330 #endif
1331 #ifdef CONFIG_HIGHMEM
1332         {
1333                 .procname       = "highmem_is_dirtyable",
1334                 .data           = &vm_highmem_is_dirtyable,
1335                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1336                 .mode           = 0644,
1337                 .proc_handler   = proc_dointvec_minmax,
1338                 .extra1         = &zero,
1339                 .extra2         = &one,
1340         },
1341 #endif
1342         {
1343                 .procname       = "scan_unevictable_pages",
1344                 .data           = &scan_unevictable_pages,
1345                 .maxlen         = sizeof(scan_unevictable_pages),
1346                 .mode           = 0644,
1347                 .proc_handler   = scan_unevictable_handler,
1348         },
1349 #ifdef CONFIG_MEMORY_FAILURE
1350         {
1351                 .procname       = "memory_failure_early_kill",
1352                 .data           = &sysctl_memory_failure_early_kill,
1353                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1354                 .mode           = 0644,
1355                 .proc_handler   = proc_dointvec_minmax,
1356                 .extra1         = &zero,
1357                 .extra2         = &one,
1358         },
1359         {
1360                 .procname       = "memory_failure_recovery",
1361                 .data           = &sysctl_memory_failure_recovery,
1362                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1363                 .mode           = 0644,
1364                 .proc_handler   = proc_dointvec_minmax,
1365                 .extra1         = &zero,
1366                 .extra2         = &one,
1367         },
1368 #endif
1369         { }
1370 };
1371
1372 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1373 static struct ctl_table binfmt_misc_table[] = {
1374         { }
1375 };
1376 #endif
1377
1378 static struct ctl_table fs_table[] = {
1379         {
1380                 .procname       = "inode-nr",
1381                 .data           = &inodes_stat,
1382                 .maxlen         = 2*sizeof(int),
1383                 .mode           = 0444,
1384                 .proc_handler   = proc_nr_inodes,
1385         },
1386         {
1387                 .procname       = "inode-state",
1388                 .data           = &inodes_stat,
1389                 .maxlen         = 7*sizeof(int),
1390                 .mode           = 0444,
1391                 .proc_handler   = proc_nr_inodes,
1392         },
1393         {
1394                 .procname       = "file-nr",
1395                 .data           = &files_stat,
1396                 .maxlen         = sizeof(files_stat),
1397                 .mode           = 0444,
1398                 .proc_handler   = proc_nr_files,
1399         },
1400         {
1401                 .procname       = "file-max",
1402                 .data           = &files_stat.max_files,
1403                 .maxlen         = sizeof(files_stat.max_files),
1404                 .mode           = 0644,
1405                 .proc_handler   = proc_doulongvec_minmax,
1406         },
1407         {
1408                 .procname       = "nr_open",
1409                 .data           = &sysctl_nr_open,
1410                 .maxlen         = sizeof(int),
1411                 .mode           = 0644,
1412                 .proc_handler   = proc_dointvec_minmax,
1413                 .extra1         = &sysctl_nr_open_min,
1414                 .extra2         = &sysctl_nr_open_max,
1415         },
1416         {
1417                 .procname       = "dentry-state",
1418                 .data           = &dentry_stat,
1419                 .maxlen         = 6*sizeof(int),
1420                 .mode           = 0444,
1421                 .proc_handler   = proc_nr_dentry,
1422         },
1423         {
1424                 .procname       = "overflowuid",
1425                 .data           = &fs_overflowuid,
1426                 .maxlen         = sizeof(int),
1427                 .mode           = 0644,
1428                 .proc_handler   = proc_dointvec_minmax,
1429                 .extra1         = &minolduid,
1430                 .extra2         = &maxolduid,
1431         },
1432         {
1433                 .procname       = "overflowgid",
1434                 .data           = &fs_overflowgid,
1435                 .maxlen         = sizeof(int),
1436                 .mode           = 0644,
1437                 .proc_handler   = proc_dointvec_minmax,
1438                 .extra1         = &minolduid,
1439                 .extra2         = &maxolduid,
1440         },
1441 #ifdef CONFIG_FILE_LOCKING
1442         {
1443                 .procname       = "leases-enable",
1444                 .data           = &leases_enable,
1445                 .maxlen         = sizeof(int),
1446                 .mode           = 0644,
1447                 .proc_handler   = proc_dointvec,
1448         },
1449 #endif
1450 #ifdef CONFIG_DNOTIFY
1451         {
1452                 .procname       = "dir-notify-enable",
1453                 .data           = &dir_notify_enable,
1454                 .maxlen         = sizeof(int),
1455                 .mode           = 0644,
1456                 .proc_handler   = proc_dointvec,
1457         },
1458 #endif
1459 #ifdef CONFIG_MMU
1460 #ifdef CONFIG_FILE_LOCKING
1461         {
1462                 .procname       = "lease-break-time",
1463                 .data           = &lease_break_time,
1464                 .maxlen         = sizeof(int),
1465                 .mode           = 0644,
1466                 .proc_handler   = proc_dointvec,
1467         },
1468 #endif
1469 #ifdef CONFIG_AIO
1470         {
1471                 .procname       = "aio-nr",
1472                 .data           = &aio_nr,
1473                 .maxlen         = sizeof(aio_nr),
1474                 .mode           = 0444,
1475                 .proc_handler   = proc_doulongvec_minmax,
1476         },
1477         {
1478                 .procname       = "aio-max-nr",
1479                 .data           = &aio_max_nr,
1480                 .maxlen         = sizeof(aio_max_nr),
1481                 .mode           = 0644,
1482                 .proc_handler   = proc_doulongvec_minmax,
1483         },
1484 #endif /* CONFIG_AIO */
1485 #ifdef CONFIG_INOTIFY_USER
1486         {
1487                 .procname       = "inotify",
1488                 .mode           = 0555,
1489                 .child          = inotify_table,
1490         },
1491 #endif
1492 #ifdef CONFIG_EPOLL
1493         {
1494                 .procname       = "epoll",
1495                 .mode           = 0555,
1496                 .child          = epoll_table,
1497         },
1498 #endif
1499 #endif
1500         {
1501                 .procname       = "protected_symlinks",
1502                 .data           = &sysctl_protected_symlinks,
1503                 .maxlen         = sizeof(int),
1504                 .mode           = 0600,
1505                 .proc_handler   = proc_dointvec_minmax,
1506                 .extra1         = &zero,
1507                 .extra2         = &one,
1508         },
1509         {
1510                 .procname       = "protected_hardlinks",
1511                 .data           = &sysctl_protected_hardlinks,
1512                 .maxlen         = sizeof(int),
1513                 .mode           = 0600,
1514                 .proc_handler   = proc_dointvec_minmax,
1515                 .extra1         = &zero,
1516                 .extra2         = &one,
1517         },
1518         {
1519                 .procname       = "suid_dumpable",
1520                 .data           = &suid_dumpable,
1521                 .maxlen         = sizeof(int),
1522                 .mode           = 0644,
1523                 .proc_handler   = proc_dointvec_minmax_coredump,
1524                 .extra1         = &zero,
1525                 .extra2         = &two,
1526         },
1527 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1528         {
1529                 .procname       = "binfmt_misc",
1530                 .mode           = 0555,
1531                 .child          = binfmt_misc_table,
1532         },
1533 #endif
1534         {
1535                 .procname       = "pipe-max-size",
1536                 .data           = &pipe_max_size,
1537                 .maxlen         = sizeof(int),
1538                 .mode           = 0644,
1539                 .proc_handler   = &pipe_proc_fn,
1540                 .extra1         = &pipe_min_size,
1541         },
1542         { }
1543 };
1544
1545 static struct ctl_table debug_table[] = {
1546 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1547     defined(CONFIG_S390) || defined(CONFIG_TILE)
1548         {
1549                 .procname       = "exception-trace",
1550                 .data           = &show_unhandled_signals,
1551                 .maxlen         = sizeof(int),
1552                 .mode           = 0644,
1553                 .proc_handler   = proc_dointvec
1554         },
1555 #endif
1556 #if defined(CONFIG_OPTPROBES)
1557         {
1558                 .procname       = "kprobes-optimization",
1559                 .data           = &sysctl_kprobes_optimization,
1560                 .maxlen         = sizeof(int),
1561                 .mode           = 0644,
1562                 .proc_handler   = proc_kprobes_optimization_handler,
1563                 .extra1         = &zero,
1564                 .extra2         = &one,
1565         },
1566 #endif
1567         { }
1568 };
1569
1570 static struct ctl_table dev_table[] = {
1571         { }
1572 };
1573
1574 int __init sysctl_init(void)
1575 {
1576         struct ctl_table_header *hdr;
1577
1578         hdr = register_sysctl_table(sysctl_base_table);
1579         kmemleak_not_leak(hdr);
1580         return 0;
1581 }
1582
1583 #endif /* CONFIG_SYSCTL */
1584
1585 /*
1586  * /proc/sys support
1587  */
1588
1589 #ifdef CONFIG_PROC_SYSCTL
1590
1591 static int _proc_do_string(void* data, int maxlen, int write,
1592                            void __user *buffer,
1593                            size_t *lenp, loff_t *ppos)
1594 {
1595         size_t len;
1596         char __user *p;
1597         char c;
1598
1599         if (!data || !maxlen || !*lenp) {
1600                 *lenp = 0;
1601                 return 0;
1602         }
1603
1604         if (write) {
1605                 len = 0;
1606                 p = buffer;
1607                 while (len < *lenp) {
1608                         if (get_user(c, p++))
1609                                 return -EFAULT;
1610                         if (c == 0 || c == '\n')
1611                                 break;
1612                         len++;
1613                 }
1614                 if (len >= maxlen)
1615                         len = maxlen-1;
1616                 if(copy_from_user(data, buffer, len))
1617                         return -EFAULT;
1618                 ((char *) data)[len] = 0;
1619                 *ppos += *lenp;
1620         } else {
1621                 len = strlen(data);
1622                 if (len > maxlen)
1623                         len = maxlen;
1624
1625                 if (*ppos > len) {
1626                         *lenp = 0;
1627                         return 0;
1628                 }
1629
1630                 data += *ppos;
1631                 len  -= *ppos;
1632
1633                 if (len > *lenp)
1634                         len = *lenp;
1635                 if (len)
1636                         if(copy_to_user(buffer, data, len))
1637                                 return -EFAULT;
1638                 if (len < *lenp) {
1639                         if(put_user('\n', ((char __user *) buffer) + len))
1640                                 return -EFAULT;
1641                         len++;
1642                 }
1643                 *lenp = len;
1644                 *ppos += len;
1645         }
1646         return 0;
1647 }
1648
1649 /**
1650  * proc_dostring - read a string sysctl
1651  * @table: the sysctl table
1652  * @write: %TRUE if this is a write to the sysctl file
1653  * @buffer: the user buffer
1654  * @lenp: the size of the user buffer
1655  * @ppos: file position
1656  *
1657  * Reads/writes a string from/to the user buffer. If the kernel
1658  * buffer provided is not large enough to hold the string, the
1659  * string is truncated. The copied string is %NULL-terminated.
1660  * If the string is being read by the user process, it is copied
1661  * and a newline '\n' is added. It is truncated if the buffer is
1662  * not large enough.
1663  *
1664  * Returns 0 on success.
1665  */
1666 int proc_dostring(struct ctl_table *table, int write,
1667                   void __user *buffer, size_t *lenp, loff_t *ppos)
1668 {
1669         return _proc_do_string(table->data, table->maxlen, write,
1670                                buffer, lenp, ppos);
1671 }
1672
1673 static size_t proc_skip_spaces(char **buf)
1674 {
1675         size_t ret;
1676         char *tmp = skip_spaces(*buf);
1677         ret = tmp - *buf;
1678         *buf = tmp;
1679         return ret;
1680 }
1681
1682 static void proc_skip_char(char **buf, size_t *size, const char v)
1683 {
1684         while (*size) {
1685                 if (**buf != v)
1686                         break;
1687                 (*size)--;
1688                 (*buf)++;
1689         }
1690 }
1691
1692 #define TMPBUFLEN 22
1693 /**
1694  * proc_get_long - reads an ASCII formatted integer from a user buffer
1695  *
1696  * @buf: a kernel buffer
1697  * @size: size of the kernel buffer
1698  * @val: this is where the number will be stored
1699  * @neg: set to %TRUE if number is negative
1700  * @perm_tr: a vector which contains the allowed trailers
1701  * @perm_tr_len: size of the perm_tr vector
1702  * @tr: pointer to store the trailer character
1703  *
1704  * In case of success %0 is returned and @buf and @size are updated with
1705  * the amount of bytes read. If @tr is non-NULL and a trailing
1706  * character exists (size is non-zero after returning from this
1707  * function), @tr is updated with the trailing character.
1708  */
1709 static int proc_get_long(char **buf, size_t *size,
1710                           unsigned long *val, bool *neg,
1711                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1712 {
1713         int len;
1714         char *p, tmp[TMPBUFLEN];
1715
1716         if (!*size)
1717                 return -EINVAL;
1718
1719         len = *size;
1720         if (len > TMPBUFLEN - 1)
1721                 len = TMPBUFLEN - 1;
1722
1723         memcpy(tmp, *buf, len);
1724
1725         tmp[len] = 0;
1726         p = tmp;
1727         if (*p == '-' && *size > 1) {
1728                 *neg = true;
1729                 p++;
1730         } else
1731                 *neg = false;
1732         if (!isdigit(*p))
1733                 return -EINVAL;
1734
1735         *val = simple_strtoul(p, &p, 0);
1736
1737         len = p - tmp;
1738
1739         /* We don't know if the next char is whitespace thus we may accept
1740          * invalid integers (e.g. 1234...a) or two integers instead of one
1741          * (e.g. 123...1). So lets not allow such large numbers. */
1742         if (len == TMPBUFLEN - 1)
1743                 return -EINVAL;
1744
1745         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1746                 return -EINVAL;
1747
1748         if (tr && (len < *size))
1749                 *tr = *p;
1750
1751         *buf += len;
1752         *size -= len;
1753
1754         return 0;
1755 }
1756
1757 /**
1758  * proc_put_long - converts an integer to a decimal ASCII formatted string
1759  *
1760  * @buf: the user buffer
1761  * @size: the size of the user buffer
1762  * @val: the integer to be converted
1763  * @neg: sign of the number, %TRUE for negative
1764  *
1765  * In case of success %0 is returned and @buf and @size are updated with
1766  * the amount of bytes written.
1767  */
1768 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1769                           bool neg)
1770 {
1771         int len;
1772         char tmp[TMPBUFLEN], *p = tmp;
1773
1774         sprintf(p, "%s%lu", neg ? "-" : "", val);
1775         len = strlen(tmp);
1776         if (len > *size)
1777                 len = *size;
1778         if (copy_to_user(*buf, tmp, len))
1779                 return -EFAULT;
1780         *size -= len;
1781         *buf += len;
1782         return 0;
1783 }
1784 #undef TMPBUFLEN
1785
1786 static int proc_put_char(void __user **buf, size_t *size, char c)
1787 {
1788         if (*size) {
1789                 char __user **buffer = (char __user **)buf;
1790                 if (put_user(c, *buffer))
1791                         return -EFAULT;
1792                 (*size)--, (*buffer)++;
1793                 *buf = *buffer;
1794         }
1795         return 0;
1796 }
1797
1798 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1799                                  int *valp,
1800                                  int write, void *data)
1801 {
1802         if (write) {
1803                 *valp = *negp ? -*lvalp : *lvalp;
1804         } else {
1805                 int val = *valp;
1806                 if (val < 0) {
1807                         *negp = true;
1808                         *lvalp = (unsigned long)-val;
1809                 } else {
1810                         *negp = false;
1811                         *lvalp = (unsigned long)val;
1812                 }
1813         }
1814         return 0;
1815 }
1816
1817 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1818
1819 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1820                   int write, void __user *buffer,
1821                   size_t *lenp, loff_t *ppos,
1822                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1823                               int write, void *data),
1824                   void *data)
1825 {
1826         int *i, vleft, first = 1, err = 0;
1827         unsigned long page = 0;
1828         size_t left;
1829         char *kbuf;
1830
1831         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1832                 *lenp = 0;
1833                 return 0;
1834         }
1835
1836         i = (int *) tbl_data;
1837         vleft = table->maxlen / sizeof(*i);
1838         left = *lenp;
1839
1840         if (!conv)
1841                 conv = do_proc_dointvec_conv;
1842
1843         if (write) {
1844                 if (left > PAGE_SIZE - 1)
1845                         left = PAGE_SIZE - 1;
1846                 page = __get_free_page(GFP_TEMPORARY);
1847                 kbuf = (char *) page;
1848                 if (!kbuf)
1849                         return -ENOMEM;
1850                 if (copy_from_user(kbuf, buffer, left)) {
1851                         err = -EFAULT;
1852                         goto free;
1853                 }
1854                 kbuf[left] = 0;
1855         }
1856
1857         for (; left && vleft--; i++, first=0) {
1858                 unsigned long lval;
1859                 bool neg;
1860
1861                 if (write) {
1862                         left -= proc_skip_spaces(&kbuf);
1863
1864                         if (!left)
1865                                 break;
1866                         err = proc_get_long(&kbuf, &left, &lval, &neg,
1867                                              proc_wspace_sep,
1868                                              sizeof(proc_wspace_sep), NULL);
1869                         if (err)
1870                                 break;
1871                         if (conv(&neg, &lval, i, 1, data)) {
1872                                 err = -EINVAL;
1873                                 break;
1874                         }
1875                 } else {
1876                         if (conv(&neg, &lval, i, 0, data)) {
1877                                 err = -EINVAL;
1878                                 break;
1879                         }
1880                         if (!first)
1881                                 err = proc_put_char(&buffer, &left, '\t');
1882                         if (err)
1883                                 break;
1884                         err = proc_put_long(&buffer, &left, lval, neg);
1885                         if (err)
1886                                 break;
1887                 }
1888         }
1889
1890         if (!write && !first && left && !err)
1891                 err = proc_put_char(&buffer, &left, '\n');
1892         if (write && !err && left)
1893                 left -= proc_skip_spaces(&kbuf);
1894 free:
1895         if (write) {
1896                 free_page(page);
1897                 if (first)
1898                         return err ? : -EINVAL;
1899         }
1900         *lenp -= left;
1901         *ppos += *lenp;
1902         return err;
1903 }
1904
1905 static int do_proc_dointvec(struct ctl_table *table, int write,
1906                   void __user *buffer, size_t *lenp, loff_t *ppos,
1907                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1908                               int write, void *data),
1909                   void *data)
1910 {
1911         return __do_proc_dointvec(table->data, table, write,
1912                         buffer, lenp, ppos, conv, data);
1913 }
1914
1915 /**
1916  * proc_dointvec - read a vector of integers
1917  * @table: the sysctl table
1918  * @write: %TRUE if this is a write to the sysctl file
1919  * @buffer: the user buffer
1920  * @lenp: the size of the user buffer
1921  * @ppos: file position
1922  *
1923  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1924  * values from/to the user buffer, treated as an ASCII string.
1925  *
1926  * Returns 0 on success.
1927  */
1928 int proc_dointvec(struct ctl_table *table, int write,
1929                      void __user *buffer, size_t *lenp, loff_t *ppos)
1930 {
1931     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1932                             NULL,NULL);
1933 }
1934
1935 /*
1936  * Taint values can only be increased
1937  * This means we can safely use a temporary.
1938  */
1939 static int proc_taint(struct ctl_table *table, int write,
1940                                void __user *buffer, size_t *lenp, loff_t *ppos)
1941 {
1942         struct ctl_table t;
1943         unsigned long tmptaint = get_taint();
1944         int err;
1945
1946         if (write && !capable(CAP_SYS_ADMIN))
1947                 return -EPERM;
1948
1949         t = *table;
1950         t.data = &tmptaint;
1951         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1952         if (err < 0)
1953                 return err;
1954
1955         if (write) {
1956                 /*
1957                  * Poor man's atomic or. Not worth adding a primitive
1958                  * to everyone's atomic.h for this
1959                  */
1960                 int i;
1961                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1962                         if ((tmptaint >> i) & 1)
1963                                 add_taint(i);
1964                 }
1965         }
1966
1967         return err;
1968 }
1969
1970 #ifdef CONFIG_PRINTK
1971 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1972                                 void __user *buffer, size_t *lenp, loff_t *ppos)
1973 {
1974         if (write && !capable(CAP_SYS_ADMIN))
1975                 return -EPERM;
1976
1977         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1978 }
1979 #endif
1980
1981 struct do_proc_dointvec_minmax_conv_param {
1982         int *min;
1983         int *max;
1984 };
1985
1986 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1987                                         int *valp,
1988                                         int write, void *data)
1989 {
1990         struct do_proc_dointvec_minmax_conv_param *param = data;
1991         if (write) {
1992                 int val = *negp ? -*lvalp : *lvalp;
1993                 if ((param->min && *param->min > val) ||
1994                     (param->max && *param->max < val))
1995                         return -EINVAL;
1996                 *valp = val;
1997         } else {
1998                 int val = *valp;
1999                 if (val < 0) {
2000                         *negp = true;
2001                         *lvalp = (unsigned long)-val;
2002                 } else {
2003                         *negp = false;
2004                         *lvalp = (unsigned long)val;
2005                 }
2006         }
2007         return 0;
2008 }
2009
2010 /**
2011  * proc_dointvec_minmax - read a vector of integers with min/max values
2012  * @table: the sysctl table
2013  * @write: %TRUE if this is a write to the sysctl file
2014  * @buffer: the user buffer
2015  * @lenp: the size of the user buffer
2016  * @ppos: file position
2017  *
2018  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2019  * values from/to the user buffer, treated as an ASCII string.
2020  *
2021  * This routine will ensure the values are within the range specified by
2022  * table->extra1 (min) and table->extra2 (max).
2023  *
2024  * Returns 0 on success.
2025  */
2026 int proc_dointvec_minmax(struct ctl_table *table, int write,
2027                   void __user *buffer, size_t *lenp, loff_t *ppos)
2028 {
2029         struct do_proc_dointvec_minmax_conv_param param = {
2030                 .min = (int *) table->extra1,
2031                 .max = (int *) table->extra2,
2032         };
2033         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2034                                 do_proc_dointvec_minmax_conv, &param);
2035 }
2036
2037 static void validate_coredump_safety(void)
2038 {
2039         if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2040             core_pattern[0] != '/' && core_pattern[0] != '|') {
2041                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2042                         "suid_dumpable=2. Pipe handler or fully qualified "\
2043                         "core dump path required.\n");
2044         }
2045 }
2046
2047 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2048                 void __user *buffer, size_t *lenp, loff_t *ppos)
2049 {
2050         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2051         if (!error)
2052                 validate_coredump_safety();
2053         return error;
2054 }
2055
2056 static int proc_dostring_coredump(struct ctl_table *table, int write,
2057                   void __user *buffer, size_t *lenp, loff_t *ppos)
2058 {
2059         int error = proc_dostring(table, write, buffer, lenp, ppos);
2060         if (!error)
2061                 validate_coredump_safety();
2062         return error;
2063 }
2064
2065 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2066                                      void __user *buffer,
2067                                      size_t *lenp, loff_t *ppos,
2068                                      unsigned long convmul,
2069                                      unsigned long convdiv)
2070 {
2071         unsigned long *i, *min, *max;
2072         int vleft, first = 1, err = 0;
2073         unsigned long page = 0;
2074         size_t left;
2075         char *kbuf;
2076
2077         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2078                 *lenp = 0;
2079                 return 0;
2080         }
2081
2082         i = (unsigned long *) data;
2083         min = (unsigned long *) table->extra1;
2084         max = (unsigned long *) table->extra2;
2085         vleft = table->maxlen / sizeof(unsigned long);
2086         left = *lenp;
2087
2088         if (write) {
2089                 if (left > PAGE_SIZE - 1)
2090                         left = PAGE_SIZE - 1;
2091                 page = __get_free_page(GFP_TEMPORARY);
2092                 kbuf = (char *) page;
2093                 if (!kbuf)
2094                         return -ENOMEM;
2095                 if (copy_from_user(kbuf, buffer, left)) {
2096                         err = -EFAULT;
2097                         goto free;
2098                 }
2099                 kbuf[left] = 0;
2100         }
2101
2102         for (; left && vleft--; i++, first = 0) {
2103                 unsigned long val;
2104
2105                 if (write) {
2106                         bool neg;
2107
2108                         left -= proc_skip_spaces(&kbuf);
2109
2110                         err = proc_get_long(&kbuf, &left, &val, &neg,
2111                                              proc_wspace_sep,
2112                                              sizeof(proc_wspace_sep), NULL);
2113                         if (err)
2114                                 break;
2115                         if (neg)
2116                                 continue;
2117                         if ((min && val < *min) || (max && val > *max))
2118                                 continue;
2119                         *i = val;
2120                 } else {
2121                         val = convdiv * (*i) / convmul;
2122                         if (!first)
2123                                 err = proc_put_char(&buffer, &left, '\t');
2124                         err = proc_put_long(&buffer, &left, val, false);
2125                         if (err)
2126                                 break;
2127                 }
2128         }
2129
2130         if (!write && !first && left && !err)
2131                 err = proc_put_char(&buffer, &left, '\n');
2132         if (write && !err)
2133                 left -= proc_skip_spaces(&kbuf);
2134 free:
2135         if (write) {
2136                 free_page(page);
2137                 if (first)
2138                         return err ? : -EINVAL;
2139         }
2140         *lenp -= left;
2141         *ppos += *lenp;
2142         return err;
2143 }
2144
2145 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2146                                      void __user *buffer,
2147                                      size_t *lenp, loff_t *ppos,
2148                                      unsigned long convmul,
2149                                      unsigned long convdiv)
2150 {
2151         return __do_proc_doulongvec_minmax(table->data, table, write,
2152                         buffer, lenp, ppos, convmul, convdiv);
2153 }
2154
2155 /**
2156  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2157  * @table: the sysctl table
2158  * @write: %TRUE if this is a write to the sysctl file
2159  * @buffer: the user buffer
2160  * @lenp: the size of the user buffer
2161  * @ppos: file position
2162  *
2163  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2164  * values from/to the user buffer, treated as an ASCII string.
2165  *
2166  * This routine will ensure the values are within the range specified by
2167  * table->extra1 (min) and table->extra2 (max).
2168  *
2169  * Returns 0 on success.
2170  */
2171 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2172                            void __user *buffer, size_t *lenp, loff_t *ppos)
2173 {
2174     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2175 }
2176
2177 /**
2178  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2179  * @table: the sysctl table
2180  * @write: %TRUE if this is a write to the sysctl file
2181  * @buffer: the user buffer
2182  * @lenp: the size of the user buffer
2183  * @ppos: file position
2184  *
2185  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2186  * values from/to the user buffer, treated as an ASCII string. The values
2187  * are treated as milliseconds, and converted to jiffies when they are stored.
2188  *
2189  * This routine will ensure the values are within the range specified by
2190  * table->extra1 (min) and table->extra2 (max).
2191  *
2192  * Returns 0 on success.
2193  */
2194 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2195                                       void __user *buffer,
2196                                       size_t *lenp, loff_t *ppos)
2197 {
2198     return do_proc_doulongvec_minmax(table, write, buffer,
2199                                      lenp, ppos, HZ, 1000l);
2200 }
2201
2202
2203 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2204                                          int *valp,
2205                                          int write, void *data)
2206 {
2207         if (write) {
2208                 if (*lvalp > LONG_MAX / HZ)
2209                         return 1;
2210                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2211         } else {
2212                 int val = *valp;
2213                 unsigned long lval;
2214                 if (val < 0) {
2215                         *negp = true;
2216                         lval = (unsigned long)-val;
2217                 } else {
2218                         *negp = false;
2219                         lval = (unsigned long)val;
2220                 }
2221                 *lvalp = lval / HZ;
2222         }
2223         return 0;
2224 }
2225
2226 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2227                                                 int *valp,
2228                                                 int write, void *data)
2229 {
2230         if (write) {
2231                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2232                         return 1;
2233                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2234         } else {
2235                 int val = *valp;
2236                 unsigned long lval;
2237                 if (val < 0) {
2238                         *negp = true;
2239                         lval = (unsigned long)-val;
2240                 } else {
2241                         *negp = false;
2242                         lval = (unsigned long)val;
2243                 }
2244                 *lvalp = jiffies_to_clock_t(lval);
2245         }
2246         return 0;
2247 }
2248
2249 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2250                                             int *valp,
2251                                             int write, void *data)
2252 {
2253         if (write) {
2254                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2255         } else {
2256                 int val = *valp;
2257                 unsigned long lval;
2258                 if (val < 0) {
2259                         *negp = true;
2260                         lval = (unsigned long)-val;
2261                 } else {
2262                         *negp = false;
2263                         lval = (unsigned long)val;
2264                 }
2265                 *lvalp = jiffies_to_msecs(lval);
2266         }
2267         return 0;
2268 }
2269
2270 /**
2271  * proc_dointvec_jiffies - read a vector of integers as seconds
2272  * @table: the sysctl table
2273  * @write: %TRUE if this is a write to the sysctl file
2274  * @buffer: the user buffer
2275  * @lenp: the size of the user buffer
2276  * @ppos: file position
2277  *
2278  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2279  * values from/to the user buffer, treated as an ASCII string.
2280  * The values read are assumed to be in seconds, and are converted into
2281  * jiffies.
2282  *
2283  * Returns 0 on success.
2284  */
2285 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2286                           void __user *buffer, size_t *lenp, loff_t *ppos)
2287 {
2288     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2289                             do_proc_dointvec_jiffies_conv,NULL);
2290 }
2291
2292 /**
2293  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2294  * @table: the sysctl table
2295  * @write: %TRUE if this is a write to the sysctl file
2296  * @buffer: the user buffer
2297  * @lenp: the size of the user buffer
2298  * @ppos: pointer to the file position
2299  *
2300  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2301  * values from/to the user buffer, treated as an ASCII string.
2302  * The values read are assumed to be in 1/USER_HZ seconds, and
2303  * are converted into jiffies.
2304  *
2305  * Returns 0 on success.
2306  */
2307 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2308                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2309 {
2310     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2311                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2312 }
2313
2314 /**
2315  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2316  * @table: the sysctl table
2317  * @write: %TRUE if this is a write to the sysctl file
2318  * @buffer: the user buffer
2319  * @lenp: the size of the user buffer
2320  * @ppos: file position
2321  * @ppos: the current position in the file
2322  *
2323  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2324  * values from/to the user buffer, treated as an ASCII string.
2325  * The values read are assumed to be in 1/1000 seconds, and
2326  * are converted into jiffies.
2327  *
2328  * Returns 0 on success.
2329  */
2330 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2331                              void __user *buffer, size_t *lenp, loff_t *ppos)
2332 {
2333         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2334                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2335 }
2336
2337 static int proc_do_cad_pid(struct ctl_table *table, int write,
2338                            void __user *buffer, size_t *lenp, loff_t *ppos)
2339 {
2340         struct pid *new_pid;
2341         pid_t tmp;
2342         int r;
2343
2344         tmp = pid_vnr(cad_pid);
2345
2346         r = __do_proc_dointvec(&tmp, table, write, buffer,
2347                                lenp, ppos, NULL, NULL);
2348         if (r || !write)
2349                 return r;
2350
2351         new_pid = find_get_pid(tmp);
2352         if (!new_pid)
2353                 return -ESRCH;
2354
2355         put_pid(xchg(&cad_pid, new_pid));
2356         return 0;
2357 }
2358
2359 /**
2360  * proc_do_large_bitmap - read/write from/to a large bitmap
2361  * @table: the sysctl table
2362  * @write: %TRUE if this is a write to the sysctl file
2363  * @buffer: the user buffer
2364  * @lenp: the size of the user buffer
2365  * @ppos: file position
2366  *
2367  * The bitmap is stored at table->data and the bitmap length (in bits)
2368  * in table->maxlen.
2369  *
2370  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2371  * large bitmaps may be represented in a compact manner. Writing into
2372  * the file will clear the bitmap then update it with the given input.
2373  *
2374  * Returns 0 on success.
2375  */
2376 int proc_do_large_bitmap(struct ctl_table *table, int write,
2377                          void __user *buffer, size_t *lenp, loff_t *ppos)
2378 {
2379         int err = 0;
2380         bool first = 1;
2381         size_t left = *lenp;
2382         unsigned long bitmap_len = table->maxlen;
2383         unsigned long *bitmap = (unsigned long *) table->data;
2384         unsigned long *tmp_bitmap = NULL;
2385         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2386
2387         if (!bitmap_len || !left || (*ppos && !write)) {
2388                 *lenp = 0;
2389                 return 0;
2390         }
2391
2392         if (write) {
2393                 unsigned long page = 0;
2394                 char *kbuf;
2395
2396                 if (left > PAGE_SIZE - 1)
2397                         left = PAGE_SIZE - 1;
2398
2399                 page = __get_free_page(GFP_TEMPORARY);
2400                 kbuf = (char *) page;
2401                 if (!kbuf)
2402                         return -ENOMEM;
2403                 if (copy_from_user(kbuf, buffer, left)) {
2404                         free_page(page);
2405                         return -EFAULT;
2406                 }
2407                 kbuf[left] = 0;
2408
2409                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2410                                      GFP_KERNEL);
2411                 if (!tmp_bitmap) {
2412                         free_page(page);
2413                         return -ENOMEM;
2414                 }
2415                 proc_skip_char(&kbuf, &left, '\n');
2416                 while (!err && left) {
2417                         unsigned long val_a, val_b;
2418                         bool neg;
2419
2420                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2421                                              sizeof(tr_a), &c);
2422                         if (err)
2423                                 break;
2424                         if (val_a >= bitmap_len || neg) {
2425                                 err = -EINVAL;
2426                                 break;
2427                         }
2428
2429                         val_b = val_a;
2430                         if (left) {
2431                                 kbuf++;
2432                                 left--;
2433                         }
2434
2435                         if (c == '-') {
2436                                 err = proc_get_long(&kbuf, &left, &val_b,
2437                                                      &neg, tr_b, sizeof(tr_b),
2438                                                      &c);
2439                                 if (err)
2440                                         break;
2441                                 if (val_b >= bitmap_len || neg ||
2442                                     val_a > val_b) {
2443                                         err = -EINVAL;
2444                                         break;
2445                                 }
2446                                 if (left) {
2447                                         kbuf++;
2448                                         left--;
2449                                 }
2450                         }
2451
2452                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2453                         first = 0;
2454                         proc_skip_char(&kbuf, &left, '\n');
2455                 }
2456                 free_page(page);
2457         } else {
2458                 unsigned long bit_a, bit_b = 0;
2459
2460                 while (left) {
2461                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2462                         if (bit_a >= bitmap_len)
2463                                 break;
2464                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2465                                                    bit_a + 1) - 1;
2466
2467                         if (!first) {
2468                                 err = proc_put_char(&buffer, &left, ',');
2469                                 if (err)
2470                                         break;
2471                         }
2472                         err = proc_put_long(&buffer, &left, bit_a, false);
2473                         if (err)
2474                                 break;
2475                         if (bit_a != bit_b) {
2476                                 err = proc_put_char(&buffer, &left, '-');
2477                                 if (err)
2478                                         break;
2479                                 err = proc_put_long(&buffer, &left, bit_b, false);
2480                                 if (err)
2481                                         break;
2482                         }
2483
2484                         first = 0; bit_b++;
2485                 }
2486                 if (!err)
2487                         err = proc_put_char(&buffer, &left, '\n');
2488         }
2489
2490         if (!err) {
2491                 if (write) {
2492                         if (*ppos)
2493                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2494                         else
2495                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2496                 }
2497                 kfree(tmp_bitmap);
2498                 *lenp -= left;
2499                 *ppos += *lenp;
2500                 return 0;
2501         } else {
2502                 kfree(tmp_bitmap);
2503                 return err;
2504         }
2505 }
2506
2507 #else /* CONFIG_PROC_SYSCTL */
2508
2509 int proc_dostring(struct ctl_table *table, int write,
2510                   void __user *buffer, size_t *lenp, loff_t *ppos)
2511 {
2512         return -ENOSYS;
2513 }
2514
2515 int proc_dointvec(struct ctl_table *table, int write,
2516                   void __user *buffer, size_t *lenp, loff_t *ppos)
2517 {
2518         return -ENOSYS;
2519 }
2520
2521 int proc_dointvec_minmax(struct ctl_table *table, int write,
2522                     void __user *buffer, size_t *lenp, loff_t *ppos)
2523 {
2524         return -ENOSYS;
2525 }
2526
2527 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2528                     void __user *buffer, size_t *lenp, loff_t *ppos)
2529 {
2530         return -ENOSYS;
2531 }
2532
2533 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2534                     void __user *buffer, size_t *lenp, loff_t *ppos)
2535 {
2536         return -ENOSYS;
2537 }
2538
2539 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2540                              void __user *buffer, size_t *lenp, loff_t *ppos)
2541 {
2542         return -ENOSYS;
2543 }
2544
2545 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2546                     void __user *buffer, size_t *lenp, loff_t *ppos)
2547 {
2548         return -ENOSYS;
2549 }
2550
2551 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2552                                       void __user *buffer,
2553                                       size_t *lenp, loff_t *ppos)
2554 {
2555     return -ENOSYS;
2556 }
2557
2558
2559 #endif /* CONFIG_PROC_SYSCTL */
2560
2561 /*
2562  * No sense putting this after each symbol definition, twice,
2563  * exception granted :-)
2564  */
2565 EXPORT_SYMBOL(proc_dointvec);
2566 EXPORT_SYMBOL(proc_dointvec_jiffies);
2567 EXPORT_SYMBOL(proc_dointvec_minmax);
2568 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2569 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2570 EXPORT_SYMBOL(proc_dostring);
2571 EXPORT_SYMBOL(proc_doulongvec_minmax);
2572 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);