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                 .data           = &nr_pdflush_threads,
1106                 .maxlen         = sizeof nr_pdflush_threads,
1107                 .mode           = 0444 /* read-only*/,
1108                 .proc_handler   = proc_dointvec,
1109         },
1110         {
1111                 .procname       = "swappiness",
1112                 .data           = &vm_swappiness,
1113                 .maxlen         = sizeof(vm_swappiness),
1114                 .mode           = 0644,
1115                 .proc_handler   = proc_dointvec_minmax,
1116                 .extra1         = &zero,
1117                 .extra2         = &one_hundred,
1118         },
1119 #ifdef CONFIG_HUGETLB_PAGE
1120         {
1121                 .procname       = "nr_hugepages",
1122                 .data           = NULL,
1123                 .maxlen         = sizeof(unsigned long),
1124                 .mode           = 0644,
1125                 .proc_handler   = hugetlb_sysctl_handler,
1126                 .extra1         = (void *)&hugetlb_zero,
1127                 .extra2         = (void *)&hugetlb_infinity,
1128         },
1129 #ifdef CONFIG_NUMA
1130         {
1131                 .procname       = "nr_hugepages_mempolicy",
1132                 .data           = NULL,
1133                 .maxlen         = sizeof(unsigned long),
1134                 .mode           = 0644,
1135                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1136                 .extra1         = (void *)&hugetlb_zero,
1137                 .extra2         = (void *)&hugetlb_infinity,
1138         },
1139 #endif
1140          {
1141                 .procname       = "hugetlb_shm_group",
1142                 .data           = &sysctl_hugetlb_shm_group,
1143                 .maxlen         = sizeof(gid_t),
1144                 .mode           = 0644,
1145                 .proc_handler   = proc_dointvec,
1146          },
1147          {
1148                 .procname       = "hugepages_treat_as_movable",
1149                 .data           = &hugepages_treat_as_movable,
1150                 .maxlen         = sizeof(int),
1151                 .mode           = 0644,
1152                 .proc_handler   = hugetlb_treat_movable_handler,
1153         },
1154         {
1155                 .procname       = "nr_overcommit_hugepages",
1156                 .data           = NULL,
1157                 .maxlen         = sizeof(unsigned long),
1158                 .mode           = 0644,
1159                 .proc_handler   = hugetlb_overcommit_handler,
1160                 .extra1         = (void *)&hugetlb_zero,
1161                 .extra2         = (void *)&hugetlb_infinity,
1162         },
1163 #endif
1164         {
1165                 .procname       = "lowmem_reserve_ratio",
1166                 .data           = &sysctl_lowmem_reserve_ratio,
1167                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1168                 .mode           = 0644,
1169                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1170         },
1171         {
1172                 .procname       = "drop_caches",
1173                 .data           = &sysctl_drop_caches,
1174                 .maxlen         = sizeof(int),
1175                 .mode           = 0644,
1176                 .proc_handler   = drop_caches_sysctl_handler,
1177                 .extra1         = &one,
1178                 .extra2         = &three,
1179         },
1180 #ifdef CONFIG_COMPACTION
1181         {
1182                 .procname       = "compact_memory",
1183                 .data           = &sysctl_compact_memory,
1184                 .maxlen         = sizeof(int),
1185                 .mode           = 0200,
1186                 .proc_handler   = sysctl_compaction_handler,
1187         },
1188         {
1189                 .procname       = "extfrag_threshold",
1190                 .data           = &sysctl_extfrag_threshold,
1191                 .maxlen         = sizeof(int),
1192                 .mode           = 0644,
1193                 .proc_handler   = sysctl_extfrag_handler,
1194                 .extra1         = &min_extfrag_threshold,
1195                 .extra2         = &max_extfrag_threshold,
1196         },
1197
1198 #endif /* CONFIG_COMPACTION */
1199         {
1200                 .procname       = "min_free_kbytes",
1201                 .data           = &min_free_kbytes,
1202                 .maxlen         = sizeof(min_free_kbytes),
1203                 .mode           = 0644,
1204                 .proc_handler   = min_free_kbytes_sysctl_handler,
1205                 .extra1         = &zero,
1206         },
1207         {
1208                 .procname       = "percpu_pagelist_fraction",
1209                 .data           = &percpu_pagelist_fraction,
1210                 .maxlen         = sizeof(percpu_pagelist_fraction),
1211                 .mode           = 0644,
1212                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1213                 .extra1         = &min_percpu_pagelist_fract,
1214         },
1215 #ifdef CONFIG_MMU
1216         {
1217                 .procname       = "max_map_count",
1218                 .data           = &sysctl_max_map_count,
1219                 .maxlen         = sizeof(sysctl_max_map_count),
1220                 .mode           = 0644,
1221                 .proc_handler   = proc_dointvec_minmax,
1222                 .extra1         = &zero,
1223         },
1224 #else
1225         {
1226                 .procname       = "nr_trim_pages",
1227                 .data           = &sysctl_nr_trim_pages,
1228                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1229                 .mode           = 0644,
1230                 .proc_handler   = proc_dointvec_minmax,
1231                 .extra1         = &zero,
1232         },
1233 #endif
1234         {
1235                 .procname       = "laptop_mode",
1236                 .data           = &laptop_mode,
1237                 .maxlen         = sizeof(laptop_mode),
1238                 .mode           = 0644,
1239                 .proc_handler   = proc_dointvec_jiffies,
1240         },
1241         {
1242                 .procname       = "block_dump",
1243                 .data           = &block_dump,
1244                 .maxlen         = sizeof(block_dump),
1245                 .mode           = 0644,
1246                 .proc_handler   = proc_dointvec,
1247                 .extra1         = &zero,
1248         },
1249         {
1250                 .procname       = "vfs_cache_pressure",
1251                 .data           = &sysctl_vfs_cache_pressure,
1252                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1253                 .mode           = 0644,
1254                 .proc_handler   = proc_dointvec,
1255                 .extra1         = &zero,
1256         },
1257 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1258         {
1259                 .procname       = "legacy_va_layout",
1260                 .data           = &sysctl_legacy_va_layout,
1261                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1262                 .mode           = 0644,
1263                 .proc_handler   = proc_dointvec,
1264                 .extra1         = &zero,
1265         },
1266 #endif
1267 #ifdef CONFIG_NUMA
1268         {
1269                 .procname       = "zone_reclaim_mode",
1270                 .data           = &zone_reclaim_mode,
1271                 .maxlen         = sizeof(zone_reclaim_mode),
1272                 .mode           = 0644,
1273                 .proc_handler   = proc_dointvec,
1274                 .extra1         = &zero,
1275         },
1276         {
1277                 .procname       = "min_unmapped_ratio",
1278                 .data           = &sysctl_min_unmapped_ratio,
1279                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1280                 .mode           = 0644,
1281                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1282                 .extra1         = &zero,
1283                 .extra2         = &one_hundred,
1284         },
1285         {
1286                 .procname       = "min_slab_ratio",
1287                 .data           = &sysctl_min_slab_ratio,
1288                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1289                 .mode           = 0644,
1290                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1291                 .extra1         = &zero,
1292                 .extra2         = &one_hundred,
1293         },
1294 #endif
1295 #ifdef CONFIG_SMP
1296         {
1297                 .procname       = "stat_interval",
1298                 .data           = &sysctl_stat_interval,
1299                 .maxlen         = sizeof(sysctl_stat_interval),
1300                 .mode           = 0644,
1301                 .proc_handler   = proc_dointvec_jiffies,
1302         },
1303 #endif
1304 #ifdef CONFIG_MMU
1305         {
1306                 .procname       = "mmap_min_addr",
1307                 .data           = &dac_mmap_min_addr,
1308                 .maxlen         = sizeof(unsigned long),
1309                 .mode           = 0644,
1310                 .proc_handler   = mmap_min_addr_handler,
1311         },
1312 #endif
1313 #ifdef CONFIG_NUMA
1314         {
1315                 .procname       = "numa_zonelist_order",
1316                 .data           = &numa_zonelist_order,
1317                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1318                 .mode           = 0644,
1319                 .proc_handler   = numa_zonelist_order_handler,
1320         },
1321 #endif
1322 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1323    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1324         {
1325                 .procname       = "vdso_enabled",
1326                 .data           = &vdso_enabled,
1327                 .maxlen         = sizeof(vdso_enabled),
1328                 .mode           = 0644,
1329                 .proc_handler   = proc_dointvec,
1330                 .extra1         = &zero,
1331         },
1332 #endif
1333 #ifdef CONFIG_HIGHMEM
1334         {
1335                 .procname       = "highmem_is_dirtyable",
1336                 .data           = &vm_highmem_is_dirtyable,
1337                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1338                 .mode           = 0644,
1339                 .proc_handler   = proc_dointvec_minmax,
1340                 .extra1         = &zero,
1341                 .extra2         = &one,
1342         },
1343 #endif
1344         {
1345                 .procname       = "scan_unevictable_pages",
1346                 .data           = &scan_unevictable_pages,
1347                 .maxlen         = sizeof(scan_unevictable_pages),
1348                 .mode           = 0644,
1349                 .proc_handler   = scan_unevictable_handler,
1350         },
1351 #ifdef CONFIG_MEMORY_FAILURE
1352         {
1353                 .procname       = "memory_failure_early_kill",
1354                 .data           = &sysctl_memory_failure_early_kill,
1355                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1356                 .mode           = 0644,
1357                 .proc_handler   = proc_dointvec_minmax,
1358                 .extra1         = &zero,
1359                 .extra2         = &one,
1360         },
1361         {
1362                 .procname       = "memory_failure_recovery",
1363                 .data           = &sysctl_memory_failure_recovery,
1364                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1365                 .mode           = 0644,
1366                 .proc_handler   = proc_dointvec_minmax,
1367                 .extra1         = &zero,
1368                 .extra2         = &one,
1369         },
1370 #endif
1371         { }
1372 };
1373
1374 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1375 static struct ctl_table binfmt_misc_table[] = {
1376         { }
1377 };
1378 #endif
1379
1380 static struct ctl_table fs_table[] = {
1381         {
1382                 .procname       = "inode-nr",
1383                 .data           = &inodes_stat,
1384                 .maxlen         = 2*sizeof(int),
1385                 .mode           = 0444,
1386                 .proc_handler   = proc_nr_inodes,
1387         },
1388         {
1389                 .procname       = "inode-state",
1390                 .data           = &inodes_stat,
1391                 .maxlen         = 7*sizeof(int),
1392                 .mode           = 0444,
1393                 .proc_handler   = proc_nr_inodes,
1394         },
1395         {
1396                 .procname       = "file-nr",
1397                 .data           = &files_stat,
1398                 .maxlen         = sizeof(files_stat),
1399                 .mode           = 0444,
1400                 .proc_handler   = proc_nr_files,
1401         },
1402         {
1403                 .procname       = "file-max",
1404                 .data           = &files_stat.max_files,
1405                 .maxlen         = sizeof(files_stat.max_files),
1406                 .mode           = 0644,
1407                 .proc_handler   = proc_doulongvec_minmax,
1408         },
1409         {
1410                 .procname       = "nr_open",
1411                 .data           = &sysctl_nr_open,
1412                 .maxlen         = sizeof(int),
1413                 .mode           = 0644,
1414                 .proc_handler   = proc_dointvec_minmax,
1415                 .extra1         = &sysctl_nr_open_min,
1416                 .extra2         = &sysctl_nr_open_max,
1417         },
1418         {
1419                 .procname       = "dentry-state",
1420                 .data           = &dentry_stat,
1421                 .maxlen         = 6*sizeof(int),
1422                 .mode           = 0444,
1423                 .proc_handler   = proc_nr_dentry,
1424         },
1425         {
1426                 .procname       = "overflowuid",
1427                 .data           = &fs_overflowuid,
1428                 .maxlen         = sizeof(int),
1429                 .mode           = 0644,
1430                 .proc_handler   = proc_dointvec_minmax,
1431                 .extra1         = &minolduid,
1432                 .extra2         = &maxolduid,
1433         },
1434         {
1435                 .procname       = "overflowgid",
1436                 .data           = &fs_overflowgid,
1437                 .maxlen         = sizeof(int),
1438                 .mode           = 0644,
1439                 .proc_handler   = proc_dointvec_minmax,
1440                 .extra1         = &minolduid,
1441                 .extra2         = &maxolduid,
1442         },
1443 #ifdef CONFIG_FILE_LOCKING
1444         {
1445                 .procname       = "leases-enable",
1446                 .data           = &leases_enable,
1447                 .maxlen         = sizeof(int),
1448                 .mode           = 0644,
1449                 .proc_handler   = proc_dointvec,
1450         },
1451 #endif
1452 #ifdef CONFIG_DNOTIFY
1453         {
1454                 .procname       = "dir-notify-enable",
1455                 .data           = &dir_notify_enable,
1456                 .maxlen         = sizeof(int),
1457                 .mode           = 0644,
1458                 .proc_handler   = proc_dointvec,
1459         },
1460 #endif
1461 #ifdef CONFIG_MMU
1462 #ifdef CONFIG_FILE_LOCKING
1463         {
1464                 .procname       = "lease-break-time",
1465                 .data           = &lease_break_time,
1466                 .maxlen         = sizeof(int),
1467                 .mode           = 0644,
1468                 .proc_handler   = proc_dointvec,
1469         },
1470 #endif
1471 #ifdef CONFIG_AIO
1472         {
1473                 .procname       = "aio-nr",
1474                 .data           = &aio_nr,
1475                 .maxlen         = sizeof(aio_nr),
1476                 .mode           = 0444,
1477                 .proc_handler   = proc_doulongvec_minmax,
1478         },
1479         {
1480                 .procname       = "aio-max-nr",
1481                 .data           = &aio_max_nr,
1482                 .maxlen         = sizeof(aio_max_nr),
1483                 .mode           = 0644,
1484                 .proc_handler   = proc_doulongvec_minmax,
1485         },
1486 #endif /* CONFIG_AIO */
1487 #ifdef CONFIG_INOTIFY_USER
1488         {
1489                 .procname       = "inotify",
1490                 .mode           = 0555,
1491                 .child          = inotify_table,
1492         },
1493 #endif
1494 #ifdef CONFIG_EPOLL
1495         {
1496                 .procname       = "epoll",
1497                 .mode           = 0555,
1498                 .child          = epoll_table,
1499         },
1500 #endif
1501 #endif
1502         {
1503                 .procname       = "suid_dumpable",
1504                 .data           = &suid_dumpable,
1505                 .maxlen         = sizeof(int),
1506                 .mode           = 0644,
1507                 .proc_handler   = proc_dointvec_minmax_coredump,
1508                 .extra1         = &zero,
1509                 .extra2         = &two,
1510         },
1511 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1512         {
1513                 .procname       = "binfmt_misc",
1514                 .mode           = 0555,
1515                 .child          = binfmt_misc_table,
1516         },
1517 #endif
1518         {
1519                 .procname       = "pipe-max-size",
1520                 .data           = &pipe_max_size,
1521                 .maxlen         = sizeof(int),
1522                 .mode           = 0644,
1523                 .proc_handler   = &pipe_proc_fn,
1524                 .extra1         = &pipe_min_size,
1525         },
1526         { }
1527 };
1528
1529 static struct ctl_table debug_table[] = {
1530 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1531     defined(CONFIG_S390) || defined(CONFIG_TILE)
1532         {
1533                 .procname       = "exception-trace",
1534                 .data           = &show_unhandled_signals,
1535                 .maxlen         = sizeof(int),
1536                 .mode           = 0644,
1537                 .proc_handler   = proc_dointvec
1538         },
1539 #endif
1540 #if defined(CONFIG_OPTPROBES)
1541         {
1542                 .procname       = "kprobes-optimization",
1543                 .data           = &sysctl_kprobes_optimization,
1544                 .maxlen         = sizeof(int),
1545                 .mode           = 0644,
1546                 .proc_handler   = proc_kprobes_optimization_handler,
1547                 .extra1         = &zero,
1548                 .extra2         = &one,
1549         },
1550 #endif
1551         { }
1552 };
1553
1554 static struct ctl_table dev_table[] = {
1555         { }
1556 };
1557
1558 int __init sysctl_init(void)
1559 {
1560         struct ctl_table_header *hdr;
1561
1562         hdr = register_sysctl_table(sysctl_base_table);
1563         kmemleak_not_leak(hdr);
1564         return 0;
1565 }
1566
1567 #endif /* CONFIG_SYSCTL */
1568
1569 /*
1570  * /proc/sys support
1571  */
1572
1573 #ifdef CONFIG_PROC_SYSCTL
1574
1575 static int _proc_do_string(void* data, int maxlen, int write,
1576                            void __user *buffer,
1577                            size_t *lenp, loff_t *ppos)
1578 {
1579         size_t len;
1580         char __user *p;
1581         char c;
1582
1583         if (!data || !maxlen || !*lenp) {
1584                 *lenp = 0;
1585                 return 0;
1586         }
1587
1588         if (write) {
1589                 len = 0;
1590                 p = buffer;
1591                 while (len < *lenp) {
1592                         if (get_user(c, p++))
1593                                 return -EFAULT;
1594                         if (c == 0 || c == '\n')
1595                                 break;
1596                         len++;
1597                 }
1598                 if (len >= maxlen)
1599                         len = maxlen-1;
1600                 if(copy_from_user(data, buffer, len))
1601                         return -EFAULT;
1602                 ((char *) data)[len] = 0;
1603                 *ppos += *lenp;
1604         } else {
1605                 len = strlen(data);
1606                 if (len > maxlen)
1607                         len = maxlen;
1608
1609                 if (*ppos > len) {
1610                         *lenp = 0;
1611                         return 0;
1612                 }
1613
1614                 data += *ppos;
1615                 len  -= *ppos;
1616
1617                 if (len > *lenp)
1618                         len = *lenp;
1619                 if (len)
1620                         if(copy_to_user(buffer, data, len))
1621                                 return -EFAULT;
1622                 if (len < *lenp) {
1623                         if(put_user('\n', ((char __user *) buffer) + len))
1624                                 return -EFAULT;
1625                         len++;
1626                 }
1627                 *lenp = len;
1628                 *ppos += len;
1629         }
1630         return 0;
1631 }
1632
1633 /**
1634  * proc_dostring - read a string sysctl
1635  * @table: the sysctl table
1636  * @write: %TRUE if this is a write to the sysctl file
1637  * @buffer: the user buffer
1638  * @lenp: the size of the user buffer
1639  * @ppos: file position
1640  *
1641  * Reads/writes a string from/to the user buffer. If the kernel
1642  * buffer provided is not large enough to hold the string, the
1643  * string is truncated. The copied string is %NULL-terminated.
1644  * If the string is being read by the user process, it is copied
1645  * and a newline '\n' is added. It is truncated if the buffer is
1646  * not large enough.
1647  *
1648  * Returns 0 on success.
1649  */
1650 int proc_dostring(struct ctl_table *table, int write,
1651                   void __user *buffer, size_t *lenp, loff_t *ppos)
1652 {
1653         return _proc_do_string(table->data, table->maxlen, write,
1654                                buffer, lenp, ppos);
1655 }
1656
1657 static size_t proc_skip_spaces(char **buf)
1658 {
1659         size_t ret;
1660         char *tmp = skip_spaces(*buf);
1661         ret = tmp - *buf;
1662         *buf = tmp;
1663         return ret;
1664 }
1665
1666 static void proc_skip_char(char **buf, size_t *size, const char v)
1667 {
1668         while (*size) {
1669                 if (**buf != v)
1670                         break;
1671                 (*size)--;
1672                 (*buf)++;
1673         }
1674 }
1675
1676 #define TMPBUFLEN 22
1677 /**
1678  * proc_get_long - reads an ASCII formatted integer from a user buffer
1679  *
1680  * @buf: a kernel buffer
1681  * @size: size of the kernel buffer
1682  * @val: this is where the number will be stored
1683  * @neg: set to %TRUE if number is negative
1684  * @perm_tr: a vector which contains the allowed trailers
1685  * @perm_tr_len: size of the perm_tr vector
1686  * @tr: pointer to store the trailer character
1687  *
1688  * In case of success %0 is returned and @buf and @size are updated with
1689  * the amount of bytes read. If @tr is non-NULL and a trailing
1690  * character exists (size is non-zero after returning from this
1691  * function), @tr is updated with the trailing character.
1692  */
1693 static int proc_get_long(char **buf, size_t *size,
1694                           unsigned long *val, bool *neg,
1695                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1696 {
1697         int len;
1698         char *p, tmp[TMPBUFLEN];
1699
1700         if (!*size)
1701                 return -EINVAL;
1702
1703         len = *size;
1704         if (len > TMPBUFLEN - 1)
1705                 len = TMPBUFLEN - 1;
1706
1707         memcpy(tmp, *buf, len);
1708
1709         tmp[len] = 0;
1710         p = tmp;
1711         if (*p == '-' && *size > 1) {
1712                 *neg = true;
1713                 p++;
1714         } else
1715                 *neg = false;
1716         if (!isdigit(*p))
1717                 return -EINVAL;
1718
1719         *val = simple_strtoul(p, &p, 0);
1720
1721         len = p - tmp;
1722
1723         /* We don't know if the next char is whitespace thus we may accept
1724          * invalid integers (e.g. 1234...a) or two integers instead of one
1725          * (e.g. 123...1). So lets not allow such large numbers. */
1726         if (len == TMPBUFLEN - 1)
1727                 return -EINVAL;
1728
1729         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1730                 return -EINVAL;
1731
1732         if (tr && (len < *size))
1733                 *tr = *p;
1734
1735         *buf += len;
1736         *size -= len;
1737
1738         return 0;
1739 }
1740
1741 /**
1742  * proc_put_long - converts an integer to a decimal ASCII formatted string
1743  *
1744  * @buf: the user buffer
1745  * @size: the size of the user buffer
1746  * @val: the integer to be converted
1747  * @neg: sign of the number, %TRUE for negative
1748  *
1749  * In case of success %0 is returned and @buf and @size are updated with
1750  * the amount of bytes written.
1751  */
1752 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1753                           bool neg)
1754 {
1755         int len;
1756         char tmp[TMPBUFLEN], *p = tmp;
1757
1758         sprintf(p, "%s%lu", neg ? "-" : "", val);
1759         len = strlen(tmp);
1760         if (len > *size)
1761                 len = *size;
1762         if (copy_to_user(*buf, tmp, len))
1763                 return -EFAULT;
1764         *size -= len;
1765         *buf += len;
1766         return 0;
1767 }
1768 #undef TMPBUFLEN
1769
1770 static int proc_put_char(void __user **buf, size_t *size, char c)
1771 {
1772         if (*size) {
1773                 char __user **buffer = (char __user **)buf;
1774                 if (put_user(c, *buffer))
1775                         return -EFAULT;
1776                 (*size)--, (*buffer)++;
1777                 *buf = *buffer;
1778         }
1779         return 0;
1780 }
1781
1782 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1783                                  int *valp,
1784                                  int write, void *data)
1785 {
1786         if (write) {
1787                 *valp = *negp ? -*lvalp : *lvalp;
1788         } else {
1789                 int val = *valp;
1790                 if (val < 0) {
1791                         *negp = true;
1792                         *lvalp = (unsigned long)-val;
1793                 } else {
1794                         *negp = false;
1795                         *lvalp = (unsigned long)val;
1796                 }
1797         }
1798         return 0;
1799 }
1800
1801 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1802
1803 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1804                   int write, void __user *buffer,
1805                   size_t *lenp, loff_t *ppos,
1806                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1807                               int write, void *data),
1808                   void *data)
1809 {
1810         int *i, vleft, first = 1, err = 0;
1811         unsigned long page = 0;
1812         size_t left;
1813         char *kbuf;
1814
1815         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1816                 *lenp = 0;
1817                 return 0;
1818         }
1819
1820         i = (int *) tbl_data;
1821         vleft = table->maxlen / sizeof(*i);
1822         left = *lenp;
1823
1824         if (!conv)
1825                 conv = do_proc_dointvec_conv;
1826
1827         if (write) {
1828                 if (left > PAGE_SIZE - 1)
1829                         left = PAGE_SIZE - 1;
1830                 page = __get_free_page(GFP_TEMPORARY);
1831                 kbuf = (char *) page;
1832                 if (!kbuf)
1833                         return -ENOMEM;
1834                 if (copy_from_user(kbuf, buffer, left)) {
1835                         err = -EFAULT;
1836                         goto free;
1837                 }
1838                 kbuf[left] = 0;
1839         }
1840
1841         for (; left && vleft--; i++, first=0) {
1842                 unsigned long lval;
1843                 bool neg;
1844
1845                 if (write) {
1846                         left -= proc_skip_spaces(&kbuf);
1847
1848                         if (!left)
1849                                 break;
1850                         err = proc_get_long(&kbuf, &left, &lval, &neg,
1851                                              proc_wspace_sep,
1852                                              sizeof(proc_wspace_sep), NULL);
1853                         if (err)
1854                                 break;
1855                         if (conv(&neg, &lval, i, 1, data)) {
1856                                 err = -EINVAL;
1857                                 break;
1858                         }
1859                 } else {
1860                         if (conv(&neg, &lval, i, 0, data)) {
1861                                 err = -EINVAL;
1862                                 break;
1863                         }
1864                         if (!first)
1865                                 err = proc_put_char(&buffer, &left, '\t');
1866                         if (err)
1867                                 break;
1868                         err = proc_put_long(&buffer, &left, lval, neg);
1869                         if (err)
1870                                 break;
1871                 }
1872         }
1873
1874         if (!write && !first && left && !err)
1875                 err = proc_put_char(&buffer, &left, '\n');
1876         if (write && !err && left)
1877                 left -= proc_skip_spaces(&kbuf);
1878 free:
1879         if (write) {
1880                 free_page(page);
1881                 if (first)
1882                         return err ? : -EINVAL;
1883         }
1884         *lenp -= left;
1885         *ppos += *lenp;
1886         return err;
1887 }
1888
1889 static int do_proc_dointvec(struct ctl_table *table, int write,
1890                   void __user *buffer, size_t *lenp, loff_t *ppos,
1891                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1892                               int write, void *data),
1893                   void *data)
1894 {
1895         return __do_proc_dointvec(table->data, table, write,
1896                         buffer, lenp, ppos, conv, data);
1897 }
1898
1899 /**
1900  * proc_dointvec - read a vector of integers
1901  * @table: the sysctl table
1902  * @write: %TRUE if this is a write to the sysctl file
1903  * @buffer: the user buffer
1904  * @lenp: the size of the user buffer
1905  * @ppos: file position
1906  *
1907  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1908  * values from/to the user buffer, treated as an ASCII string.
1909  *
1910  * Returns 0 on success.
1911  */
1912 int proc_dointvec(struct ctl_table *table, int write,
1913                      void __user *buffer, size_t *lenp, loff_t *ppos)
1914 {
1915     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1916                             NULL,NULL);
1917 }
1918
1919 /*
1920  * Taint values can only be increased
1921  * This means we can safely use a temporary.
1922  */
1923 static int proc_taint(struct ctl_table *table, int write,
1924                                void __user *buffer, size_t *lenp, loff_t *ppos)
1925 {
1926         struct ctl_table t;
1927         unsigned long tmptaint = get_taint();
1928         int err;
1929
1930         if (write && !capable(CAP_SYS_ADMIN))
1931                 return -EPERM;
1932
1933         t = *table;
1934         t.data = &tmptaint;
1935         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1936         if (err < 0)
1937                 return err;
1938
1939         if (write) {
1940                 /*
1941                  * Poor man's atomic or. Not worth adding a primitive
1942                  * to everyone's atomic.h for this
1943                  */
1944                 int i;
1945                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1946                         if ((tmptaint >> i) & 1)
1947                                 add_taint(i);
1948                 }
1949         }
1950
1951         return err;
1952 }
1953
1954 #ifdef CONFIG_PRINTK
1955 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1956                                 void __user *buffer, size_t *lenp, loff_t *ppos)
1957 {
1958         if (write && !capable(CAP_SYS_ADMIN))
1959                 return -EPERM;
1960
1961         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1962 }
1963 #endif
1964
1965 struct do_proc_dointvec_minmax_conv_param {
1966         int *min;
1967         int *max;
1968 };
1969
1970 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1971                                         int *valp,
1972                                         int write, void *data)
1973 {
1974         struct do_proc_dointvec_minmax_conv_param *param = data;
1975         if (write) {
1976                 int val = *negp ? -*lvalp : *lvalp;
1977                 if ((param->min && *param->min > val) ||
1978                     (param->max && *param->max < val))
1979                         return -EINVAL;
1980                 *valp = val;
1981         } else {
1982                 int val = *valp;
1983                 if (val < 0) {
1984                         *negp = true;
1985                         *lvalp = (unsigned long)-val;
1986                 } else {
1987                         *negp = false;
1988                         *lvalp = (unsigned long)val;
1989                 }
1990         }
1991         return 0;
1992 }
1993
1994 /**
1995  * proc_dointvec_minmax - read a vector of integers with min/max values
1996  * @table: the sysctl table
1997  * @write: %TRUE if this is a write to the sysctl file
1998  * @buffer: the user buffer
1999  * @lenp: the size of the user buffer
2000  * @ppos: file position
2001  *
2002  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2003  * values from/to the user buffer, treated as an ASCII string.
2004  *
2005  * This routine will ensure the values are within the range specified by
2006  * table->extra1 (min) and table->extra2 (max).
2007  *
2008  * Returns 0 on success.
2009  */
2010 int proc_dointvec_minmax(struct ctl_table *table, int write,
2011                   void __user *buffer, size_t *lenp, loff_t *ppos)
2012 {
2013         struct do_proc_dointvec_minmax_conv_param param = {
2014                 .min = (int *) table->extra1,
2015                 .max = (int *) table->extra2,
2016         };
2017         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2018                                 do_proc_dointvec_minmax_conv, &param);
2019 }
2020
2021 static void validate_coredump_safety(void)
2022 {
2023         if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2024             core_pattern[0] != '/' && core_pattern[0] != '|') {
2025                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2026                         "suid_dumpable=2. Pipe handler or fully qualified "\
2027                         "core dump path required.\n");
2028         }
2029 }
2030
2031 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2032                 void __user *buffer, size_t *lenp, loff_t *ppos)
2033 {
2034         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2035         if (!error)
2036                 validate_coredump_safety();
2037         return error;
2038 }
2039
2040 static int proc_dostring_coredump(struct ctl_table *table, int write,
2041                   void __user *buffer, size_t *lenp, loff_t *ppos)
2042 {
2043         int error = proc_dostring(table, write, buffer, lenp, ppos);
2044         if (!error)
2045                 validate_coredump_safety();
2046         return error;
2047 }
2048
2049 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2050                                      void __user *buffer,
2051                                      size_t *lenp, loff_t *ppos,
2052                                      unsigned long convmul,
2053                                      unsigned long convdiv)
2054 {
2055         unsigned long *i, *min, *max;
2056         int vleft, first = 1, err = 0;
2057         unsigned long page = 0;
2058         size_t left;
2059         char *kbuf;
2060
2061         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2062                 *lenp = 0;
2063                 return 0;
2064         }
2065
2066         i = (unsigned long *) data;
2067         min = (unsigned long *) table->extra1;
2068         max = (unsigned long *) table->extra2;
2069         vleft = table->maxlen / sizeof(unsigned long);
2070         left = *lenp;
2071
2072         if (write) {
2073                 if (left > PAGE_SIZE - 1)
2074                         left = PAGE_SIZE - 1;
2075                 page = __get_free_page(GFP_TEMPORARY);
2076                 kbuf = (char *) page;
2077                 if (!kbuf)
2078                         return -ENOMEM;
2079                 if (copy_from_user(kbuf, buffer, left)) {
2080                         err = -EFAULT;
2081                         goto free;
2082                 }
2083                 kbuf[left] = 0;
2084         }
2085
2086         for (; left && vleft--; i++, first = 0) {
2087                 unsigned long val;
2088
2089                 if (write) {
2090                         bool neg;
2091
2092                         left -= proc_skip_spaces(&kbuf);
2093
2094                         err = proc_get_long(&kbuf, &left, &val, &neg,
2095                                              proc_wspace_sep,
2096                                              sizeof(proc_wspace_sep), NULL);
2097                         if (err)
2098                                 break;
2099                         if (neg)
2100                                 continue;
2101                         if ((min && val < *min) || (max && val > *max))
2102                                 continue;
2103                         *i = val;
2104                 } else {
2105                         val = convdiv * (*i) / convmul;
2106                         if (!first)
2107                                 err = proc_put_char(&buffer, &left, '\t');
2108                         err = proc_put_long(&buffer, &left, val, false);
2109                         if (err)
2110                                 break;
2111                 }
2112         }
2113
2114         if (!write && !first && left && !err)
2115                 err = proc_put_char(&buffer, &left, '\n');
2116         if (write && !err)
2117                 left -= proc_skip_spaces(&kbuf);
2118 free:
2119         if (write) {
2120                 free_page(page);
2121                 if (first)
2122                         return err ? : -EINVAL;
2123         }
2124         *lenp -= left;
2125         *ppos += *lenp;
2126         return err;
2127 }
2128
2129 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2130                                      void __user *buffer,
2131                                      size_t *lenp, loff_t *ppos,
2132                                      unsigned long convmul,
2133                                      unsigned long convdiv)
2134 {
2135         return __do_proc_doulongvec_minmax(table->data, table, write,
2136                         buffer, lenp, ppos, convmul, convdiv);
2137 }
2138
2139 /**
2140  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2141  * @table: the sysctl table
2142  * @write: %TRUE if this is a write to the sysctl file
2143  * @buffer: the user buffer
2144  * @lenp: the size of the user buffer
2145  * @ppos: file position
2146  *
2147  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2148  * values from/to the user buffer, treated as an ASCII string.
2149  *
2150  * This routine will ensure the values are within the range specified by
2151  * table->extra1 (min) and table->extra2 (max).
2152  *
2153  * Returns 0 on success.
2154  */
2155 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2156                            void __user *buffer, size_t *lenp, loff_t *ppos)
2157 {
2158     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2159 }
2160
2161 /**
2162  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2163  * @table: the sysctl table
2164  * @write: %TRUE if this is a write to the sysctl file
2165  * @buffer: the user buffer
2166  * @lenp: the size of the user buffer
2167  * @ppos: file position
2168  *
2169  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2170  * values from/to the user buffer, treated as an ASCII string. The values
2171  * are treated as milliseconds, and converted to jiffies when they are stored.
2172  *
2173  * This routine will ensure the values are within the range specified by
2174  * table->extra1 (min) and table->extra2 (max).
2175  *
2176  * Returns 0 on success.
2177  */
2178 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2179                                       void __user *buffer,
2180                                       size_t *lenp, loff_t *ppos)
2181 {
2182     return do_proc_doulongvec_minmax(table, write, buffer,
2183                                      lenp, ppos, HZ, 1000l);
2184 }
2185
2186
2187 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2188                                          int *valp,
2189                                          int write, void *data)
2190 {
2191         if (write) {
2192                 if (*lvalp > LONG_MAX / HZ)
2193                         return 1;
2194                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2195         } else {
2196                 int val = *valp;
2197                 unsigned long lval;
2198                 if (val < 0) {
2199                         *negp = true;
2200                         lval = (unsigned long)-val;
2201                 } else {
2202                         *negp = false;
2203                         lval = (unsigned long)val;
2204                 }
2205                 *lvalp = lval / HZ;
2206         }
2207         return 0;
2208 }
2209
2210 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2211                                                 int *valp,
2212                                                 int write, void *data)
2213 {
2214         if (write) {
2215                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2216                         return 1;
2217                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2218         } else {
2219                 int val = *valp;
2220                 unsigned long lval;
2221                 if (val < 0) {
2222                         *negp = true;
2223                         lval = (unsigned long)-val;
2224                 } else {
2225                         *negp = false;
2226                         lval = (unsigned long)val;
2227                 }
2228                 *lvalp = jiffies_to_clock_t(lval);
2229         }
2230         return 0;
2231 }
2232
2233 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2234                                             int *valp,
2235                                             int write, void *data)
2236 {
2237         if (write) {
2238                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2239         } else {
2240                 int val = *valp;
2241                 unsigned long lval;
2242                 if (val < 0) {
2243                         *negp = true;
2244                         lval = (unsigned long)-val;
2245                 } else {
2246                         *negp = false;
2247                         lval = (unsigned long)val;
2248                 }
2249                 *lvalp = jiffies_to_msecs(lval);
2250         }
2251         return 0;
2252 }
2253
2254 /**
2255  * proc_dointvec_jiffies - read a vector of integers as seconds
2256  * @table: the sysctl table
2257  * @write: %TRUE if this is a write to the sysctl file
2258  * @buffer: the user buffer
2259  * @lenp: the size of the user buffer
2260  * @ppos: file position
2261  *
2262  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2263  * values from/to the user buffer, treated as an ASCII string.
2264  * The values read are assumed to be in seconds, and are converted into
2265  * jiffies.
2266  *
2267  * Returns 0 on success.
2268  */
2269 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2270                           void __user *buffer, size_t *lenp, loff_t *ppos)
2271 {
2272     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2273                             do_proc_dointvec_jiffies_conv,NULL);
2274 }
2275
2276 /**
2277  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2278  * @table: the sysctl table
2279  * @write: %TRUE if this is a write to the sysctl file
2280  * @buffer: the user buffer
2281  * @lenp: the size of the user buffer
2282  * @ppos: pointer to the file position
2283  *
2284  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2285  * values from/to the user buffer, treated as an ASCII string.
2286  * The values read are assumed to be in 1/USER_HZ seconds, and
2287  * are converted into jiffies.
2288  *
2289  * Returns 0 on success.
2290  */
2291 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2292                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2293 {
2294     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2295                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2296 }
2297
2298 /**
2299  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2300  * @table: the sysctl table
2301  * @write: %TRUE if this is a write to the sysctl file
2302  * @buffer: the user buffer
2303  * @lenp: the size of the user buffer
2304  * @ppos: file position
2305  * @ppos: the current position in the file
2306  *
2307  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2308  * values from/to the user buffer, treated as an ASCII string.
2309  * The values read are assumed to be in 1/1000 seconds, and
2310  * are converted into jiffies.
2311  *
2312  * Returns 0 on success.
2313  */
2314 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2315                              void __user *buffer, size_t *lenp, loff_t *ppos)
2316 {
2317         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2318                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2319 }
2320
2321 static int proc_do_cad_pid(struct ctl_table *table, int write,
2322                            void __user *buffer, size_t *lenp, loff_t *ppos)
2323 {
2324         struct pid *new_pid;
2325         pid_t tmp;
2326         int r;
2327
2328         tmp = pid_vnr(cad_pid);
2329
2330         r = __do_proc_dointvec(&tmp, table, write, buffer,
2331                                lenp, ppos, NULL, NULL);
2332         if (r || !write)
2333                 return r;
2334
2335         new_pid = find_get_pid(tmp);
2336         if (!new_pid)
2337                 return -ESRCH;
2338
2339         put_pid(xchg(&cad_pid, new_pid));
2340         return 0;
2341 }
2342
2343 /**
2344  * proc_do_large_bitmap - read/write from/to a large bitmap
2345  * @table: the sysctl table
2346  * @write: %TRUE if this is a write to the sysctl file
2347  * @buffer: the user buffer
2348  * @lenp: the size of the user buffer
2349  * @ppos: file position
2350  *
2351  * The bitmap is stored at table->data and the bitmap length (in bits)
2352  * in table->maxlen.
2353  *
2354  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2355  * large bitmaps may be represented in a compact manner. Writing into
2356  * the file will clear the bitmap then update it with the given input.
2357  *
2358  * Returns 0 on success.
2359  */
2360 int proc_do_large_bitmap(struct ctl_table *table, int write,
2361                          void __user *buffer, size_t *lenp, loff_t *ppos)
2362 {
2363         int err = 0;
2364         bool first = 1;
2365         size_t left = *lenp;
2366         unsigned long bitmap_len = table->maxlen;
2367         unsigned long *bitmap = (unsigned long *) table->data;
2368         unsigned long *tmp_bitmap = NULL;
2369         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2370
2371         if (!bitmap_len || !left || (*ppos && !write)) {
2372                 *lenp = 0;
2373                 return 0;
2374         }
2375
2376         if (write) {
2377                 unsigned long page = 0;
2378                 char *kbuf;
2379
2380                 if (left > PAGE_SIZE - 1)
2381                         left = PAGE_SIZE - 1;
2382
2383                 page = __get_free_page(GFP_TEMPORARY);
2384                 kbuf = (char *) page;
2385                 if (!kbuf)
2386                         return -ENOMEM;
2387                 if (copy_from_user(kbuf, buffer, left)) {
2388                         free_page(page);
2389                         return -EFAULT;
2390                 }
2391                 kbuf[left] = 0;
2392
2393                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2394                                      GFP_KERNEL);
2395                 if (!tmp_bitmap) {
2396                         free_page(page);
2397                         return -ENOMEM;
2398                 }
2399                 proc_skip_char(&kbuf, &left, '\n');
2400                 while (!err && left) {
2401                         unsigned long val_a, val_b;
2402                         bool neg;
2403
2404                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2405                                              sizeof(tr_a), &c);
2406                         if (err)
2407                                 break;
2408                         if (val_a >= bitmap_len || neg) {
2409                                 err = -EINVAL;
2410                                 break;
2411                         }
2412
2413                         val_b = val_a;
2414                         if (left) {
2415                                 kbuf++;
2416                                 left--;
2417                         }
2418
2419                         if (c == '-') {
2420                                 err = proc_get_long(&kbuf, &left, &val_b,
2421                                                      &neg, tr_b, sizeof(tr_b),
2422                                                      &c);
2423                                 if (err)
2424                                         break;
2425                                 if (val_b >= bitmap_len || neg ||
2426                                     val_a > val_b) {
2427                                         err = -EINVAL;
2428                                         break;
2429                                 }
2430                                 if (left) {
2431                                         kbuf++;
2432                                         left--;
2433                                 }
2434                         }
2435
2436                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2437                         first = 0;
2438                         proc_skip_char(&kbuf, &left, '\n');
2439                 }
2440                 free_page(page);
2441         } else {
2442                 unsigned long bit_a, bit_b = 0;
2443
2444                 while (left) {
2445                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2446                         if (bit_a >= bitmap_len)
2447                                 break;
2448                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2449                                                    bit_a + 1) - 1;
2450
2451                         if (!first) {
2452                                 err = proc_put_char(&buffer, &left, ',');
2453                                 if (err)
2454                                         break;
2455                         }
2456                         err = proc_put_long(&buffer, &left, bit_a, false);
2457                         if (err)
2458                                 break;
2459                         if (bit_a != bit_b) {
2460                                 err = proc_put_char(&buffer, &left, '-');
2461                                 if (err)
2462                                         break;
2463                                 err = proc_put_long(&buffer, &left, bit_b, false);
2464                                 if (err)
2465                                         break;
2466                         }
2467
2468                         first = 0; bit_b++;
2469                 }
2470                 if (!err)
2471                         err = proc_put_char(&buffer, &left, '\n');
2472         }
2473
2474         if (!err) {
2475                 if (write) {
2476                         if (*ppos)
2477                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2478                         else
2479                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2480                 }
2481                 kfree(tmp_bitmap);
2482                 *lenp -= left;
2483                 *ppos += *lenp;
2484                 return 0;
2485         } else {
2486                 kfree(tmp_bitmap);
2487                 return err;
2488         }
2489 }
2490
2491 #else /* CONFIG_PROC_SYSCTL */
2492
2493 int proc_dostring(struct ctl_table *table, int write,
2494                   void __user *buffer, size_t *lenp, loff_t *ppos)
2495 {
2496         return -ENOSYS;
2497 }
2498
2499 int proc_dointvec(struct ctl_table *table, int write,
2500                   void __user *buffer, size_t *lenp, loff_t *ppos)
2501 {
2502         return -ENOSYS;
2503 }
2504
2505 int proc_dointvec_minmax(struct ctl_table *table, int write,
2506                     void __user *buffer, size_t *lenp, loff_t *ppos)
2507 {
2508         return -ENOSYS;
2509 }
2510
2511 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2512                     void __user *buffer, size_t *lenp, loff_t *ppos)
2513 {
2514         return -ENOSYS;
2515 }
2516
2517 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2518                     void __user *buffer, size_t *lenp, loff_t *ppos)
2519 {
2520         return -ENOSYS;
2521 }
2522
2523 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2524                              void __user *buffer, size_t *lenp, loff_t *ppos)
2525 {
2526         return -ENOSYS;
2527 }
2528
2529 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2530                     void __user *buffer, size_t *lenp, loff_t *ppos)
2531 {
2532         return -ENOSYS;
2533 }
2534
2535 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2536                                       void __user *buffer,
2537                                       size_t *lenp, loff_t *ppos)
2538 {
2539     return -ENOSYS;
2540 }
2541
2542
2543 #endif /* CONFIG_PROC_SYSCTL */
2544
2545 /*
2546  * No sense putting this after each symbol definition, twice,
2547  * exception granted :-)
2548  */
2549 EXPORT_SYMBOL(proc_dointvec);
2550 EXPORT_SYMBOL(proc_dointvec_jiffies);
2551 EXPORT_SYMBOL(proc_dointvec_minmax);
2552 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2553 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2554 EXPORT_SYMBOL(proc_dostring);
2555 EXPORT_SYMBOL(proc_doulongvec_minmax);
2556 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);