kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/bitmap.h>
  27 #include <linux/signal.h>
  28 #include <linux/printk.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/security.h>
  31 #include <linux/ctype.h>
  32 #include <linux/kmemcheck.h>
  33 #include <linux/kmemleak.h>
  34 #include <linux/fs.h>
  35 #include <linux/init.h>
  36 #include <linux/kernel.h>
  37 #include <linux/kobject.h>
  38 #include <linux/net.h>
  39 #include <linux/sysrq.h>
  40 #include <linux/highuid.h>
  41 #include <linux/writeback.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/compaction.h>
  44 #include <linux/hugetlb.h>
  45 #include <linux/initrd.h>
  46 #include <linux/key.h>
  47 #include <linux/times.h>
  48 #include <linux/limits.h>
  49 #include <linux/dcache.h>
  50 #include <linux/dnotify.h>
  51 #include <linux/syscalls.h>
  52 #include <linux/vmstat.h>
  53 #include <linux/nfs_fs.h>
  54 #include <linux/acpi.h>
  55 #include <linux/reboot.h>
  56 #include <linux/ftrace.h>
  57 #include <linux/perf_event.h>
  58 #include <linux/kprobes.h>
  59 #include <linux/pipe_fs_i.h>
  60 #include <linux/oom.h>
  61 #include <linux/kmod.h>
  62 #include <linux/capability.h>
  63 #include <linux/binfmts.h>
  64 #include <linux/sched/sysctl.h>
  65 #include <linux/kexec.h>
  66
  67 #include <asm/uaccess.h>
  68 #include <asm/processor.h>
  69
  70 #ifdef CONFIG_X86
  71 #include <asm/nmi.h>
  72 #include <asm/stacktrace.h>
  73 #include <asm/io.h>
  74 #endif
  75 #ifdef CONFIG_SPARC
  76 #include <asm/setup.h>
  77 #endif
  78 #ifdef CONFIG_BSD_PROCESS_ACCT
  79 #include <linux/acct.h>
  80 #endif
  81 #ifdef CONFIG_RT_MUTEXES
  82 #include <linux/rtmutex.h>
  83 #endif
  84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  85 #include <linux/lockdep.h>
  86 #endif
  87 #ifdef CONFIG_CHR_DEV_SG
  88 #include <scsi/sg.h>
  89 #endif
  90
  91 #ifdef CONFIG_LOCKUP_DETECTOR
  92 #include <linux/nmi.h>
  93 #endif
  94
  95
  96 #if defined(CONFIG_SYSCTL)
  97
  98 /* External variables not in a header file. */
  99 extern int max_threads;
 100 extern int suid_dumpable;
 101 #ifdef CONFIG_COREDUMP
 102 extern int core_uses_pid;
 103 extern char core_pattern[];
 104 extern unsigned int core_pipe_limit;
 105 #endif
 106 extern int pid_max;
 107 extern int pid_max_min, pid_max_max;
 108 extern int percpu_pagelist_fraction;
 109 extern int compat_log;
 110 extern int latencytop_enabled;
 111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 112 #ifndef CONFIG_MMU
 113 extern int sysctl_nr_trim_pages;
 114 #endif
 115
 116 /* Constants used for minimum and  maximum */
 117 #ifdef CONFIG_LOCKUP_DETECTOR
 118 static int sixty = 60;
 119 #endif
 120
 121 static int __maybe_unused neg_one = -1;
 122
 123 static int zero;
 124 static int __maybe_unused one = 1;
 125 static int __maybe_unused two = 2;
 126 static int __maybe_unused four = 4;
 127 static unsigned long one_ul = 1;
 128 static int one_hundred = 100;
 129 #ifdef CONFIG_PRINTK
 130 static int ten_thousand = 10000;
 131 #endif
 132
 133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 135
 136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 137 static int maxolduid = 65535;
 138 static int minolduid;
 139
 140 static int ngroups_max = NGROUPS_MAX;
 141 static const int cap_last_cap = CAP_LAST_CAP;
 142
 143 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
 144 #ifdef CONFIG_DETECT_HUNG_TASK
 145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 146 #endif
 147
 148 #ifdef CONFIG_INOTIFY_USER
 149 #include <linux/inotify.h>
 150 #endif
 151 #ifdef CONFIG_SPARC
 152 #endif
 153
 154 #ifdef __hppa__
 155 extern int pwrsw_enabled;
 156 #endif
 157
 158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 159 extern int unaligned_enabled;
 160 #endif
 161
 162 #ifdef CONFIG_IA64
 163 extern int unaligned_dump_stack;
 164 #endif
 165
 166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 167 extern int no_unaligned_warning;
 168 #endif
 169
 170 #ifdef CONFIG_PROC_SYSCTL
 171
 172 #define SYSCTL_WRITES_LEGACY    -1
 173 #define SYSCTL_WRITES_WARN       0
 174 #define SYSCTL_WRITES_STRICT     1
 175
 176 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
 177
 178 static int proc_do_cad_pid(struct ctl_table *table, int write,
 179                   void __user *buffer, size_t *lenp, loff_t *ppos);
 180 static int proc_taint(struct ctl_table *table, int write,
 181                                void __user *buffer, size_t *lenp, loff_t *ppos);
 182 #endif
 183
 184 #ifdef CONFIG_PRINTK
 185 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 186                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 187 #endif
 188
 189 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 190                 void __user *buffer, size_t *lenp, loff_t *ppos);
 191 #ifdef CONFIG_COREDUMP
 192 static int proc_dostring_coredump(struct ctl_table *table, int write,
 193                 void __user *buffer, size_t *lenp, loff_t *ppos);
 194 #endif
 195
 196 #ifdef CONFIG_MAGIC_SYSRQ
 197 /* Note: sysrq code uses it's own private copy */
 198 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 199
 200 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 201                                 void __user *buffer, size_t *lenp,
 202                                 loff_t *ppos)
 203 {
 204         int error;
 205
 206         error = proc_dointvec(table, write, buffer, lenp, ppos);
 207         if (error)
 208                 return error;
 209
 210         if (write)
 211                 sysrq_toggle_support(__sysrq_enabled);
 212
 213         return 0;
 214 }
 215
 216 #endif
 217
 218 static struct ctl_table kern_table[];
 219 static struct ctl_table vm_table[];
 220 static struct ctl_table fs_table[];
 221 static struct ctl_table debug_table[];
 222 static struct ctl_table dev_table[];
 223 extern struct ctl_table random_table[];
 224 #ifdef CONFIG_EPOLL
 225 extern struct ctl_table epoll_table[];
 226 #endif
 227
 228 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 229 int sysctl_legacy_va_layout;
 230 #endif
 231
 232 /* The default sysctl tables: */
 233
 234 static struct ctl_table sysctl_base_table[] = {
 235         {
 236                 .procname       = "kernel",
 237                 .mode           = 0555,
 238                 .child          = kern_table,
 239         },
 240         {
 241                 .procname       = "vm",
 242                 .mode           = 0555,
 243                 .child          = vm_table,
 244         },
 245         {
 246                 .procname       = "fs",
 247                 .mode           = 0555,
 248                 .child          = fs_table,
 249         },
 250         {
 251                 .procname       = "debug",
 252                 .mode           = 0555,
 253                 .child          = debug_table,
 254         },
 255         {
 256                 .procname       = "dev",
 257                 .mode           = 0555,
 258                 .child          = dev_table,
 259         },
 260         { }
 261 };
 262
 263 #ifdef CONFIG_SCHED_DEBUG
 264 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 265 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 266 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 267 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 268 #ifdef CONFIG_SMP
 269 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 270 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 271 #endif /* CONFIG_SMP */
 272 #endif /* CONFIG_SCHED_DEBUG */
 273
 274 #ifdef CONFIG_COMPACTION
 275 static int min_extfrag_threshold;
 276 static int max_extfrag_threshold = 1000;
 277 #endif
 278
 279 static struct ctl_table kern_table[] = {
 280         {
 281                 .procname       = "sched_child_runs_first",
 282                 .data           = &sysctl_sched_child_runs_first,
 283                 .maxlen         = sizeof(unsigned int),
 284                 .mode           = 0644,
 285                 .proc_handler   = proc_dointvec,
 286         },
 287 #ifdef CONFIG_SCHED_DEBUG
 288         {
 289                 .procname       = "sched_min_granularity_ns",
 290                 .data           = &sysctl_sched_min_granularity,
 291                 .maxlen         = sizeof(unsigned int),
 292                 .mode           = 0644,
 293                 .proc_handler   = sched_proc_update_handler,
 294                 .extra1         = &min_sched_granularity_ns,
 295                 .extra2         = &max_sched_granularity_ns,
 296         },
 297         {
 298                 .procname       = "sched_latency_ns",
 299                 .data           = &sysctl_sched_latency,
 300                 .maxlen         = sizeof(unsigned int),
 301                 .mode           = 0644,
 302                 .proc_handler   = sched_proc_update_handler,
 303                 .extra1         = &min_sched_granularity_ns,
 304                 .extra2         = &max_sched_granularity_ns,
 305         },
 306         {
 307                 .procname       = "sched_wakeup_granularity_ns",
 308                 .data           = &sysctl_sched_wakeup_granularity,
 309                 .maxlen         = sizeof(unsigned int),
 310                 .mode           = 0644,
 311                 .proc_handler   = sched_proc_update_handler,
 312                 .extra1         = &min_wakeup_granularity_ns,
 313                 .extra2         = &max_wakeup_granularity_ns,
 314         },
 315 #ifdef CONFIG_SMP
 316         {
 317                 .procname       = "sched_tunable_scaling",
 318                 .data           = &sysctl_sched_tunable_scaling,
 319                 .maxlen         = sizeof(enum sched_tunable_scaling),
 320                 .mode           = 0644,
 321                 .proc_handler   = sched_proc_update_handler,
 322                 .extra1         = &min_sched_tunable_scaling,
 323                 .extra2         = &max_sched_tunable_scaling,
 324         },
 325         {
 326                 .procname       = "sched_migration_cost_ns",
 327                 .data           = &sysctl_sched_migration_cost,
 328                 .maxlen         = sizeof(unsigned int),
 329                 .mode           = 0644,
 330                 .proc_handler   = proc_dointvec,
 331         },
 332         {
 333                 .procname       = "sched_nr_migrate",
 334                 .data           = &sysctl_sched_nr_migrate,
 335                 .maxlen         = sizeof(unsigned int),
 336                 .mode           = 0644,
 337                 .proc_handler   = proc_dointvec,
 338         },
 339         {
 340                 .procname       = "sched_time_avg_ms",
 341                 .data           = &sysctl_sched_time_avg,
 342                 .maxlen         = sizeof(unsigned int),
 343                 .mode           = 0644,
 344                 .proc_handler   = proc_dointvec,
 345         },
 346         {
 347                 .procname       = "sched_shares_window_ns",
 348                 .data           = &sysctl_sched_shares_window,
 349                 .maxlen         = sizeof(unsigned int),
 350                 .mode           = 0644,
 351                 .proc_handler   = proc_dointvec,
 352         },
 353         {
 354                 .procname       = "timer_migration",
 355                 .data           = &sysctl_timer_migration,
 356                 .maxlen         = sizeof(unsigned int),
 357                 .mode           = 0644,
 358                 .proc_handler   = proc_dointvec_minmax,
 359                 .extra1         = &zero,
 360                 .extra2         = &one,
 361         },
 362 #endif /* CONFIG_SMP */
 363 #ifdef CONFIG_NUMA_BALANCING
 364         {
 365                 .procname       = "numa_balancing_scan_delay_ms",
 366                 .data           = &sysctl_numa_balancing_scan_delay,
 367                 .maxlen         = sizeof(unsigned int),
 368                 .mode           = 0644,
 369                 .proc_handler   = proc_dointvec,
 370         },
 371         {
 372                 .procname       = "numa_balancing_scan_period_min_ms",
 373                 .data           = &sysctl_numa_balancing_scan_period_min,
 374                 .maxlen         = sizeof(unsigned int),
 375                 .mode           = 0644,
 376                 .proc_handler   = proc_dointvec,
 377         },
 378         {
 379                 .procname       = "numa_balancing_scan_period_max_ms",
 380                 .data           = &sysctl_numa_balancing_scan_period_max,
 381                 .maxlen         = sizeof(unsigned int),
 382                 .mode           = 0644,
 383                 .proc_handler   = proc_dointvec,
 384         },
 385         {
 386                 .procname       = "numa_balancing_scan_size_mb",
 387                 .data           = &sysctl_numa_balancing_scan_size,
 388                 .maxlen         = sizeof(unsigned int),
 389                 .mode           = 0644,
 390                 .proc_handler   = proc_dointvec,
 391         },
 392         {
 393                 .procname       = "numa_balancing",
 394                 .data           = NULL, /* filled in by handler */
 395                 .maxlen         = sizeof(unsigned int),
 396                 .mode           = 0644,
 397                 .proc_handler   = sysctl_numa_balancing,
 398                 .extra1         = &zero,
 399                 .extra2         = &one,
 400         },
 401 #endif /* CONFIG_NUMA_BALANCING */
 402 #endif /* CONFIG_SCHED_DEBUG */
 403         {
 404                 .procname       = "sched_rt_period_us",
 405                 .data           = &sysctl_sched_rt_period,
 406                 .maxlen         = sizeof(unsigned int),
 407                 .mode           = 0644,
 408                 .proc_handler   = sched_rt_handler,
 409         },
 410         {
 411                 .procname       = "sched_rt_runtime_us",
 412                 .data           = &sysctl_sched_rt_runtime,
 413                 .maxlen         = sizeof(int),
 414                 .mode           = 0644,
 415                 .proc_handler   = sched_rt_handler,
 416         },
 417         {
 418                 .procname       = "sched_rr_timeslice_ms",
 419                 .data           = &sched_rr_timeslice,
 420                 .maxlen         = sizeof(int),
 421                 .mode           = 0644,
 422                 .proc_handler   = sched_rr_handler,
 423         },
 424 #ifdef CONFIG_SCHED_AUTOGROUP
 425         {
 426                 .procname       = "sched_autogroup_enabled",
 427                 .data           = &sysctl_sched_autogroup_enabled,
 428                 .maxlen         = sizeof(unsigned int),
 429                 .mode           = 0644,
 430                 .proc_handler   = proc_dointvec_minmax,
 431                 .extra1         = &zero,
 432                 .extra2         = &one,
 433         },
 434 #endif
 435 #ifdef CONFIG_CFS_BANDWIDTH
 436         {
 437                 .procname       = "sched_cfs_bandwidth_slice_us",
 438                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 439                 .maxlen         = sizeof(unsigned int),
 440                 .mode           = 0644,
 441                 .proc_handler   = proc_dointvec_minmax,
 442                 .extra1         = &one,
 443         },
 444 #endif
 445 #ifdef CONFIG_PROVE_LOCKING
 446         {
 447                 .procname       = "prove_locking",
 448                 .data           = &prove_locking,
 449                 .maxlen         = sizeof(int),
 450                 .mode           = 0644,
 451                 .proc_handler   = proc_dointvec,
 452         },
 453 #endif
 454 #ifdef CONFIG_LOCK_STAT
 455         {
 456                 .procname       = "lock_stat",
 457                 .data           = &lock_stat,
 458                 .maxlen         = sizeof(int),
 459                 .mode           = 0644,
 460                 .proc_handler   = proc_dointvec,
 461         },
 462 #endif
 463         {
 464                 .procname       = "panic",
 465                 .data           = &panic_timeout,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec,
 469         },
 470 #ifdef CONFIG_COREDUMP
 471         {
 472                 .procname       = "core_uses_pid",
 473                 .data           = &core_uses_pid,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = proc_dointvec,
 477         },
 478         {
 479                 .procname       = "core_pattern",
 480                 .data           = core_pattern,
 481                 .maxlen         = CORENAME_MAX_SIZE,
 482                 .mode           = 0644,
 483                 .proc_handler   = proc_dostring_coredump,
 484         },
 485         {
 486                 .procname       = "core_pipe_limit",
 487                 .data           = &core_pipe_limit,
 488                 .maxlen         = sizeof(unsigned int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec,
 491         },
 492 #endif
 493 #ifdef CONFIG_PROC_SYSCTL
 494         {
 495                 .procname       = "tainted",
 496                 .maxlen         = sizeof(long),
 497                 .mode           = 0644,
 498                 .proc_handler   = proc_taint,
 499         },
 500         {
 501                 .procname       = "sysctl_writes_strict",
 502                 .data           = &sysctl_writes_strict,
 503                 .maxlen         = sizeof(int),
 504                 .mode           = 0644,
 505                 .proc_handler   = proc_dointvec_minmax,
 506                 .extra1         = &neg_one,
 507                 .extra2         = &one,
 508         },
 509 #endif
 510 #ifdef CONFIG_LATENCYTOP
 511         {
 512                 .procname       = "latencytop",
 513                 .data           = &latencytop_enabled,
 514                 .maxlen         = sizeof(int),
 515                 .mode           = 0644,
 516                 .proc_handler   = proc_dointvec,
 517         },
 518 #endif
 519 #ifdef CONFIG_BLK_DEV_INITRD
 520         {
 521                 .procname       = "real-root-dev",
 522                 .data           = &real_root_dev,
 523                 .maxlen         = sizeof(int),
 524                 .mode           = 0644,
 525                 .proc_handler   = proc_dointvec,
 526         },
 527 #endif
 528         {
 529                 .procname       = "print-fatal-signals",
 530                 .data           = &print_fatal_signals,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = proc_dointvec,
 534         },
 535 #ifdef CONFIG_SPARC
 536         {
 537                 .procname       = "reboot-cmd",
 538                 .data           = reboot_command,
 539                 .maxlen         = 256,
 540                 .mode           = 0644,
 541                 .proc_handler   = proc_dostring,
 542         },
 543         {
 544                 .procname       = "stop-a",
 545                 .data           = &stop_a_enabled,
 546                 .maxlen         = sizeof (int),
 547                 .mode           = 0644,
 548                 .proc_handler   = proc_dointvec,
 549         },
 550         {
 551                 .procname       = "scons-poweroff",
 552                 .data           = &scons_pwroff,
 553                 .maxlen         = sizeof (int),
 554                 .mode           = 0644,
 555                 .proc_handler   = proc_dointvec,
 556         },
 557 #endif
 558 #ifdef CONFIG_SPARC64
 559         {
 560                 .procname       = "tsb-ratio",
 561                 .data           = &sysctl_tsb_ratio,
 562                 .maxlen         = sizeof (int),
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_dointvec,
 565         },
 566 #endif
 567 #ifdef __hppa__
 568         {
 569                 .procname       = "soft-power",
 570                 .data           = &pwrsw_enabled,
 571                 .maxlen         = sizeof (int),
 572                 .mode           = 0644,
 573                 .proc_handler   = proc_dointvec,
 574         },
 575 #endif
 576 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 577         {
 578                 .procname       = "unaligned-trap",
 579                 .data           = &unaligned_enabled,
 580                 .maxlen         = sizeof (int),
 581                 .mode           = 0644,
 582                 .proc_handler   = proc_dointvec,
 583         },
 584 #endif
 585         {
 586                 .procname       = "ctrl-alt-del",
 587                 .data           = &C_A_D,
 588                 .maxlen         = sizeof(int),
 589                 .mode           = 0644,
 590                 .proc_handler   = proc_dointvec,
 591         },
 592 #ifdef CONFIG_FUNCTION_TRACER
 593         {
 594                 .procname       = "ftrace_enabled",
 595                 .data           = &ftrace_enabled,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = ftrace_enable_sysctl,
 599         },
 600 #endif
 601 #ifdef CONFIG_STACK_TRACER
 602         {
 603                 .procname       = "stack_tracer_enabled",
 604                 .data           = &stack_tracer_enabled,
 605                 .maxlen         = sizeof(int),
 606                 .mode           = 0644,
 607                 .proc_handler   = stack_trace_sysctl,
 608         },
 609 #endif
 610 #ifdef CONFIG_TRACING
 611         {
 612                 .procname       = "ftrace_dump_on_oops",
 613                 .data           = &ftrace_dump_on_oops,
 614                 .maxlen         = sizeof(int),
 615                 .mode           = 0644,
 616                 .proc_handler   = proc_dointvec,
 617         },
 618         {
 619                 .procname       = "traceoff_on_warning",
 620                 .data           = &__disable_trace_on_warning,
 621                 .maxlen         = sizeof(__disable_trace_on_warning),
 622                 .mode           = 0644,
 623                 .proc_handler   = proc_dointvec,
 624         },
 625 #endif
 626 #ifdef CONFIG_KEXEC
 627         {
 628                 .procname       = "kexec_load_disabled",
 629                 .data           = &kexec_load_disabled,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 /* only handle a transition from default "0" to "1" */
 633                 .proc_handler   = proc_dointvec_minmax,
 634                 .extra1         = &one,
 635                 .extra2         = &one,
 636         },
 637 #endif
 638 #ifdef CONFIG_MODULES
 639         {
 640                 .procname       = "modprobe",
 641                 .data           = &modprobe_path,
 642                 .maxlen         = KMOD_PATH_LEN,
 643                 .mode           = 0644,
 644                 .proc_handler   = proc_dostring,
 645         },
 646         {
 647                 .procname       = "modules_disabled",
 648                 .data           = &modules_disabled,
 649                 .maxlen         = sizeof(int),
 650                 .mode           = 0644,
 651                 /* only handle a transition from default "0" to "1" */
 652                 .proc_handler   = proc_dointvec_minmax,
 653                 .extra1         = &one,
 654                 .extra2         = &one,
 655         },
 656 #endif
 657 #ifdef CONFIG_UEVENT_HELPER
 658         {
 659                 .procname       = "hotplug",
 660                 .data           = &uevent_helper,
 661                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 662                 .mode           = 0644,
 663                 .proc_handler   = proc_dostring,
 664         },
 665 #endif
 666 #ifdef CONFIG_CHR_DEV_SG
 667         {
 668                 .procname       = "sg-big-buff",
 669                 .data           = &sg_big_buff,
 670                 .maxlen         = sizeof (int),
 671                 .mode           = 0444,
 672                 .proc_handler   = proc_dointvec,
 673         },
 674 #endif
 675 #ifdef CONFIG_BSD_PROCESS_ACCT
 676         {
 677                 .procname       = "acct",
 678                 .data           = &acct_parm,
 679                 .maxlen         = 3*sizeof(int),
 680                 .mode           = 0644,
 681                 .proc_handler   = proc_dointvec,
 682         },
 683 #endif
 684 #ifdef CONFIG_MAGIC_SYSRQ
 685         {
 686                 .procname       = "sysrq",
 687                 .data           = &__sysrq_enabled,
 688                 .maxlen         = sizeof (int),
 689                 .mode           = 0644,
 690                 .proc_handler   = sysrq_sysctl_handler,
 691         },
 692 #endif
 693 #ifdef CONFIG_PROC_SYSCTL
 694         {
 695                 .procname       = "cad_pid",
 696                 .data           = NULL,
 697                 .maxlen         = sizeof (int),
 698                 .mode           = 0600,
 699                 .proc_handler   = proc_do_cad_pid,
 700         },
 701 #endif
 702         {
 703                 .procname       = "threads-max",
 704                 .data           = &max_threads,
 705                 .maxlen         = sizeof(int),
 706                 .mode           = 0644,
 707                 .proc_handler   = proc_dointvec,
 708         },
 709         {
 710                 .procname       = "random",
 711                 .mode           = 0555,
 712                 .child          = random_table,
 713         },
 714         {
 715                 .procname       = "usermodehelper",
 716                 .mode           = 0555,
 717                 .child          = usermodehelper_table,
 718         },
 719         {
 720                 .procname       = "overflowuid",
 721                 .data           = &overflowuid,
 722                 .maxlen         = sizeof(int),
 723                 .mode           = 0644,
 724                 .proc_handler   = proc_dointvec_minmax,
 725                 .extra1         = &minolduid,
 726                 .extra2         = &maxolduid,
 727         },
 728         {
 729                 .procname       = "overflowgid",
 730                 .data           = &overflowgid,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_dointvec_minmax,
 734                 .extra1         = &minolduid,
 735                 .extra2         = &maxolduid,
 736         },
 737 #ifdef CONFIG_S390
 738 #ifdef CONFIG_MATHEMU
 739         {
 740                 .procname       = "ieee_emulation_warnings",
 741                 .data           = &sysctl_ieee_emulation_warnings,
 742                 .maxlen         = sizeof(int),
 743                 .mode           = 0644,
 744                 .proc_handler   = proc_dointvec,
 745         },
 746 #endif
 747         {
 748                 .procname       = "userprocess_debug",
 749                 .data           = &show_unhandled_signals,
 750                 .maxlen         = sizeof(int),
 751                 .mode           = 0644,
 752                 .proc_handler   = proc_dointvec,
 753         },
 754 #endif
 755         {
 756                 .procname       = "pid_max",
 757                 .data           = &pid_max,
 758                 .maxlen         = sizeof (int),
 759                 .mode           = 0644,
 760                 .proc_handler   = proc_dointvec_minmax,
 761                 .extra1         = &pid_max_min,
 762                 .extra2         = &pid_max_max,
 763         },
 764         {
 765                 .procname       = "panic_on_oops",
 766                 .data           = &panic_on_oops,
 767                 .maxlen         = sizeof(int),
 768                 .mode           = 0644,
 769                 .proc_handler   = proc_dointvec,
 770         },
 771 #if defined CONFIG_PRINTK
 772         {
 773                 .procname       = "printk",
 774                 .data           = &console_loglevel,
 775                 .maxlen         = 4*sizeof(int),
 776                 .mode           = 0644,
 777                 .proc_handler   = proc_dointvec,
 778         },
 779         {
 780                 .procname       = "printk_ratelimit",
 781                 .data           = &printk_ratelimit_state.interval,
 782                 .maxlen         = sizeof(int),
 783                 .mode           = 0644,
 784                 .proc_handler   = proc_dointvec_jiffies,
 785         },
 786         {
 787                 .procname       = "printk_ratelimit_burst",
 788                 .data           = &printk_ratelimit_state.burst,
 789                 .maxlen         = sizeof(int),
 790                 .mode           = 0644,
 791                 .proc_handler   = proc_dointvec,
 792         },
 793         {
 794                 .procname       = "printk_delay",
 795                 .data           = &printk_delay_msec,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = proc_dointvec_minmax,
 799                 .extra1         = &zero,
 800                 .extra2         = &ten_thousand,
 801         },
 802         {
 803                 .procname       = "dmesg_restrict",
 804                 .data           = &dmesg_restrict,
 805                 .maxlen         = sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 808                 .extra1         = &zero,
 809                 .extra2         = &one,
 810         },
 811         {
 812                 .procname       = "kptr_restrict",
 813                 .data           = &kptr_restrict,
 814                 .maxlen         = sizeof(int),
 815                 .mode           = 0644,
 816                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 817                 .extra1         = &zero,
 818                 .extra2         = &two,
 819         },
 820 #endif
 821         {
 822                 .procname       = "ngroups_max",
 823                 .data           = &ngroups_max,
 824                 .maxlen         = sizeof (int),
 825                 .mode           = 0444,
 826                 .proc_handler   = proc_dointvec,
 827         },
 828         {
 829                 .procname       = "cap_last_cap",
 830                 .data           = (void *)&cap_last_cap,
 831                 .maxlen         = sizeof(int),
 832                 .mode           = 0444,
 833                 .proc_handler   = proc_dointvec,
 834         },
 835 #if defined(CONFIG_LOCKUP_DETECTOR)
 836         {
 837                 .procname       = "watchdog",
 838                 .data           = &watchdog_user_enabled,
 839                 .maxlen         = sizeof (int),
 840                 .mode           = 0644,
 841                 .proc_handler   = proc_dowatchdog,
 842                 .extra1         = &zero,
 843                 .extra2         = &one,
 844         },
 845         {
 846                 .procname       = "watchdog_thresh",
 847                 .data           = &watchdog_thresh,
 848                 .maxlen         = sizeof(int),
 849                 .mode           = 0644,
 850                 .proc_handler   = proc_dowatchdog,
 851                 .extra1         = &zero,
 852                 .extra2         = &sixty,
 853         },
 854         {
 855                 .procname       = "softlockup_panic",
 856                 .data           = &softlockup_panic,
 857                 .maxlen         = sizeof(int),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_dointvec_minmax,
 860                 .extra1         = &zero,
 861                 .extra2         = &one,
 862         },
 863 #ifdef CONFIG_SMP
 864         {
 865                 .procname       = "softlockup_all_cpu_backtrace",
 866                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 867                 .maxlen         = sizeof(int),
 868                 .mode           = 0644,
 869                 .proc_handler   = proc_dointvec_minmax,
 870                 .extra1         = &zero,
 871                 .extra2         = &one,
 872         },
 873 #endif /* CONFIG_SMP */
 874         {
 875                 .procname       = "nmi_watchdog",
 876                 .data           = &watchdog_user_enabled,
 877                 .maxlen         = sizeof (int),
 878                 .mode           = 0644,
 879                 .proc_handler   = proc_dowatchdog,
 880                 .extra1         = &zero,
 881                 .extra2         = &one,
 882         },
 883 #endif
 884 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 885         {
 886                 .procname       = "unknown_nmi_panic",
 887                 .data           = &unknown_nmi_panic,
 888                 .maxlen         = sizeof (int),
 889                 .mode           = 0644,
 890                 .proc_handler   = proc_dointvec,
 891         },
 892 #endif
 893 #if defined(CONFIG_X86)
 894         {
 895                 .procname       = "panic_on_unrecovered_nmi",
 896                 .data           = &panic_on_unrecovered_nmi,
 897                 .maxlen         = sizeof(int),
 898                 .mode           = 0644,
 899                 .proc_handler   = proc_dointvec,
 900         },
 901         {
 902                 .procname       = "panic_on_io_nmi",
 903                 .data           = &panic_on_io_nmi,
 904                 .maxlen         = sizeof(int),
 905                 .mode           = 0644,
 906                 .proc_handler   = proc_dointvec,
 907         },
 908 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 909         {
 910                 .procname       = "panic_on_stackoverflow",
 911                 .data           = &sysctl_panic_on_stackoverflow,
 912                 .maxlen         = sizeof(int),
 913                 .mode           = 0644,
 914                 .proc_handler   = proc_dointvec,
 915         },
 916 #endif
 917         {
 918                 .procname       = "bootloader_type",
 919                 .data           = &bootloader_type,
 920                 .maxlen         = sizeof (int),
 921                 .mode           = 0444,
 922                 .proc_handler   = proc_dointvec,
 923         },
 924         {
 925                 .procname       = "bootloader_version",
 926                 .data           = &bootloader_version,
 927                 .maxlen         = sizeof (int),
 928                 .mode           = 0444,
 929                 .proc_handler   = proc_dointvec,
 930         },
 931         {
 932                 .procname       = "kstack_depth_to_print",
 933                 .data           = &kstack_depth_to_print,
 934                 .maxlen         = sizeof(int),
 935                 .mode           = 0644,
 936                 .proc_handler   = proc_dointvec,
 937         },
 938         {
 939                 .procname       = "io_delay_type",
 940                 .data           = &io_delay_type,
 941                 .maxlen         = sizeof(int),
 942                 .mode           = 0644,
 943                 .proc_handler   = proc_dointvec,
 944         },
 945 #endif
 946 #if defined(CONFIG_MMU)
 947         {
 948                 .procname       = "randomize_va_space",
 949                 .data           = &randomize_va_space,
 950                 .maxlen         = sizeof(int),
 951                 .mode           = 0644,
 952                 .proc_handler   = proc_dointvec,
 953         },
 954 #endif
 955 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 956         {
 957                 .procname       = "spin_retry",
 958                 .data           = &spin_retry,
 959                 .maxlen         = sizeof (int),
 960                 .mode           = 0644,
 961                 .proc_handler   = proc_dointvec,
 962         },
 963 #endif
 964 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 965         {
 966                 .procname       = "acpi_video_flags",
 967                 .data           = &acpi_realmode_flags,
 968                 .maxlen         = sizeof (unsigned long),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_doulongvec_minmax,
 971         },
 972 #endif
 973 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 974         {
 975                 .procname       = "ignore-unaligned-usertrap",
 976                 .data           = &no_unaligned_warning,
 977                 .maxlen         = sizeof (int),
 978                 .mode           = 0644,
 979                 .proc_handler   = proc_dointvec,
 980         },
 981 #endif
 982 #ifdef CONFIG_IA64
 983         {
 984                 .procname       = "unaligned-dump-stack",
 985                 .data           = &unaligned_dump_stack,
 986                 .maxlen         = sizeof (int),
 987                 .mode           = 0644,
 988                 .proc_handler   = proc_dointvec,
 989         },
 990 #endif
 991 #ifdef CONFIG_DETECT_HUNG_TASK
 992         {
 993                 .procname       = "hung_task_panic",
 994                 .data           = &sysctl_hung_task_panic,
 995                 .maxlen         = sizeof(int),
 996                 .mode           = 0644,
 997                 .proc_handler   = proc_dointvec_minmax,
 998                 .extra1         = &zero,
 999                 .extra2         = &one,
1000         },
1001         {
1002                 .procname       = "hung_task_check_count",
1003                 .data           = &sysctl_hung_task_check_count,
1004                 .maxlen         = sizeof(int),
1005                 .mode           = 0644,
1006                 .proc_handler   = proc_dointvec_minmax,
1007                 .extra1         = &zero,
1008         },
1009         {
1010                 .procname       = "hung_task_timeout_secs",
1011                 .data           = &sysctl_hung_task_timeout_secs,
1012                 .maxlen         = sizeof(unsigned long),
1013                 .mode           = 0644,
1014                 .proc_handler   = proc_dohung_task_timeout_secs,
1015                 .extra2         = &hung_task_timeout_max,
1016         },
1017         {
1018                 .procname       = "hung_task_warnings",
1019                 .data           = &sysctl_hung_task_warnings,
1020                 .maxlen         = sizeof(int),
1021                 .mode           = 0644,
1022                 .proc_handler   = proc_dointvec_minmax,
1023                 .extra1         = &neg_one,
1024         },
1025 #endif
1026 #ifdef CONFIG_COMPAT
1027         {
1028                 .procname       = "compat-log",
1029                 .data           = &compat_log,
1030                 .maxlen         = sizeof (int),
1031                 .mode           = 0644,
1032                 .proc_handler   = proc_dointvec,
1033         },
1034 #endif
1035 #ifdef CONFIG_RT_MUTEXES
1036         {
1037                 .procname       = "max_lock_depth",
1038                 .data           = &max_lock_depth,
1039                 .maxlen         = sizeof(int),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_dointvec,
1042         },
1043 #endif
1044         {
1045                 .procname       = "poweroff_cmd",
1046                 .data           = &poweroff_cmd,
1047                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1048                 .mode           = 0644,
1049                 .proc_handler   = proc_dostring,
1050         },
1051 #ifdef CONFIG_KEYS
1052         {
1053                 .procname       = "keys",
1054                 .mode           = 0555,
1055                 .child          = key_sysctls,
1056         },
1057 #endif
1058 #ifdef CONFIG_PERF_EVENTS
1059         /*
1060          * User-space scripts rely on the existence of this file
1061          * as a feature check for perf_events being enabled.
1062          *
1063          * So it's an ABI, do not remove!
1064          */
1065         {
1066                 .procname       = "perf_event_paranoid",
1067                 .data           = &sysctl_perf_event_paranoid,
1068                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1069                 .mode           = 0644,
1070                 .proc_handler   = proc_dointvec,
1071         },
1072         {
1073                 .procname       = "perf_event_mlock_kb",
1074                 .data           = &sysctl_perf_event_mlock,
1075                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1076                 .mode           = 0644,
1077                 .proc_handler   = proc_dointvec,
1078         },
1079         {
1080                 .procname       = "perf_event_max_sample_rate",
1081                 .data           = &sysctl_perf_event_sample_rate,
1082                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1083                 .mode           = 0644,
1084                 .proc_handler   = perf_proc_update_handler,
1085                 .extra1         = &one,
1086         },
1087         {
1088                 .procname       = "perf_cpu_time_max_percent",
1089                 .data           = &sysctl_perf_cpu_time_max_percent,
1090                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1091                 .mode           = 0644,
1092                 .proc_handler   = perf_cpu_time_max_percent_handler,
1093                 .extra1         = &zero,
1094                 .extra2         = &one_hundred,
1095         },
1096 #endif
1097 #ifdef CONFIG_KMEMCHECK
1098         {
1099                 .procname       = "kmemcheck",
1100                 .data           = &kmemcheck_enabled,
1101                 .maxlen         = sizeof(int),
1102                 .mode           = 0644,
1103                 .proc_handler   = proc_dointvec,
1104         },
1105 #endif
1106         { }
1107 };
1108
1109 static struct ctl_table vm_table[] = {
1110         {
1111                 .procname       = "overcommit_memory",
1112                 .data           = &sysctl_overcommit_memory,
1113                 .maxlen         = sizeof(sysctl_overcommit_memory),
1114                 .mode           = 0644,
1115                 .proc_handler   = proc_dointvec_minmax,
1116                 .extra1         = &zero,
1117                 .extra2         = &two,
1118         },
1119         {
1120                 .procname       = "panic_on_oom",
1121                 .data           = &sysctl_panic_on_oom,
1122                 .maxlen         = sizeof(sysctl_panic_on_oom),
1123                 .mode           = 0644,
1124                 .proc_handler   = proc_dointvec_minmax,
1125                 .extra1         = &zero,
1126                 .extra2         = &two,
1127         },
1128         {
1129                 .procname       = "oom_kill_allocating_task",
1130                 .data           = &sysctl_oom_kill_allocating_task,
1131                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1132                 .mode           = 0644,
1133                 .proc_handler   = proc_dointvec,
1134         },
1135         {
1136                 .procname       = "oom_dump_tasks",
1137                 .data           = &sysctl_oom_dump_tasks,
1138                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1139                 .mode           = 0644,
1140                 .proc_handler   = proc_dointvec,
1141         },
1142         {
1143                 .procname       = "overcommit_ratio",
1144                 .data           = &sysctl_overcommit_ratio,
1145                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1146                 .mode           = 0644,
1147                 .proc_handler   = overcommit_ratio_handler,
1148         },
1149         {
1150                 .procname       = "overcommit_kbytes",
1151                 .data           = &sysctl_overcommit_kbytes,
1152                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1153                 .mode           = 0644,
1154                 .proc_handler   = overcommit_kbytes_handler,
1155         },
1156         {
1157                 .procname       = "page-cluster",
1158                 .data           = &page_cluster,
1159                 .maxlen         = sizeof(int),
1160                 .mode           = 0644,
1161                 .proc_handler   = proc_dointvec_minmax,
1162                 .extra1         = &zero,
1163         },
1164         {
1165                 .procname       = "dirty_background_ratio",
1166                 .data           = &dirty_background_ratio,
1167                 .maxlen         = sizeof(dirty_background_ratio),
1168                 .mode           = 0644,
1169                 .proc_handler   = dirty_background_ratio_handler,
1170                 .extra1         = &zero,
1171                 .extra2         = &one_hundred,
1172         },
1173         {
1174                 .procname       = "dirty_background_bytes",
1175                 .data           = &dirty_background_bytes,
1176                 .maxlen         = sizeof(dirty_background_bytes),
1177                 .mode           = 0644,
1178                 .proc_handler   = dirty_background_bytes_handler,
1179                 .extra1         = &one_ul,
1180         },
1181         {
1182                 .procname       = "dirty_ratio",
1183                 .data           = &vm_dirty_ratio,
1184                 .maxlen         = sizeof(vm_dirty_ratio),
1185                 .mode           = 0644,
1186                 .proc_handler   = dirty_ratio_handler,
1187                 .extra1         = &zero,
1188                 .extra2         = &one_hundred,
1189         },
1190         {
1191                 .procname       = "dirty_bytes",
1192                 .data           = &vm_dirty_bytes,
1193                 .maxlen         = sizeof(vm_dirty_bytes),
1194                 .mode           = 0644,
1195                 .proc_handler   = dirty_bytes_handler,
1196                 .extra1         = &dirty_bytes_min,
1197         },
1198         {
1199                 .procname       = "dirty_writeback_centisecs",
1200                 .data           = &dirty_writeback_interval,
1201                 .maxlen         = sizeof(dirty_writeback_interval),
1202                 .mode           = 0644,
1203                 .proc_handler   = dirty_writeback_centisecs_handler,
1204         },
1205         {
1206                 .procname       = "dirty_expire_centisecs",
1207                 .data           = &dirty_expire_interval,
1208                 .maxlen         = sizeof(dirty_expire_interval),
1209                 .mode           = 0644,
1210                 .proc_handler   = proc_dointvec_minmax,
1211                 .extra1         = &zero,
1212         },
1213         {
1214                 .procname       = "nr_pdflush_threads",
1215                 .mode           = 0444 /* read-only */,
1216                 .proc_handler   = pdflush_proc_obsolete,
1217         },
1218         {
1219                 .procname       = "swappiness",
1220                 .data           = &vm_swappiness,
1221                 .maxlen         = sizeof(vm_swappiness),
1222                 .mode           = 0644,
1223                 .proc_handler   = proc_dointvec_minmax,
1224                 .extra1         = &zero,
1225                 .extra2         = &one_hundred,
1226         },
1227 #ifdef CONFIG_HUGETLB_PAGE
1228         {
1229                 .procname       = "nr_hugepages",
1230                 .data           = NULL,
1231                 .maxlen         = sizeof(unsigned long),
1232                 .mode           = 0644,
1233                 .proc_handler   = hugetlb_sysctl_handler,
1234                 .extra1         = &zero,
1235         },
1236 #ifdef CONFIG_NUMA
1237         {
1238                 .procname       = "nr_hugepages_mempolicy",
1239                 .data           = NULL,
1240                 .maxlen         = sizeof(unsigned long),
1241                 .mode           = 0644,
1242                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1243                 .extra1         = &zero,
1244         },
1245 #endif
1246          {
1247                 .procname       = "hugetlb_shm_group",
1248                 .data           = &sysctl_hugetlb_shm_group,
1249                 .maxlen         = sizeof(gid_t),
1250                 .mode           = 0644,
1251                 .proc_handler   = proc_dointvec,
1252          },
1253          {
1254                 .procname       = "hugepages_treat_as_movable",
1255                 .data           = &hugepages_treat_as_movable,
1256                 .maxlen         = sizeof(int),
1257                 .mode           = 0644,
1258                 .proc_handler   = proc_dointvec,
1259         },
1260         {
1261                 .procname       = "nr_overcommit_hugepages",
1262                 .data           = NULL,
1263                 .maxlen         = sizeof(unsigned long),
1264                 .mode           = 0644,
1265                 .proc_handler   = hugetlb_overcommit_handler,
1266                 .extra1         = &zero,
1267         },
1268 #endif
1269         {
1270                 .procname       = "lowmem_reserve_ratio",
1271                 .data           = &sysctl_lowmem_reserve_ratio,
1272                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1273                 .mode           = 0644,
1274                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1275         },
1276         {
1277                 .procname       = "drop_caches",
1278                 .data           = &sysctl_drop_caches,
1279                 .maxlen         = sizeof(int),
1280                 .mode           = 0644,
1281                 .proc_handler   = drop_caches_sysctl_handler,
1282                 .extra1         = &one,
1283                 .extra2         = &four,
1284         },
1285 #ifdef CONFIG_COMPACTION
1286         {
1287                 .procname       = "compact_memory",
1288                 .data           = &sysctl_compact_memory,
1289                 .maxlen         = sizeof(int),
1290                 .mode           = 0200,
1291                 .proc_handler   = sysctl_compaction_handler,
1292         },
1293         {
1294                 .procname       = "extfrag_threshold",
1295                 .data           = &sysctl_extfrag_threshold,
1296                 .maxlen         = sizeof(int),
1297                 .mode           = 0644,
1298                 .proc_handler   = sysctl_extfrag_handler,
1299                 .extra1         = &min_extfrag_threshold,
1300                 .extra2         = &max_extfrag_threshold,
1301         },
1302
1303 #endif /* CONFIG_COMPACTION */
1304         {
1305                 .procname       = "min_free_kbytes",
1306                 .data           = &min_free_kbytes,
1307                 .maxlen         = sizeof(min_free_kbytes),
1308                 .mode           = 0644,
1309                 .proc_handler   = min_free_kbytes_sysctl_handler,
1310                 .extra1         = &zero,
1311         },
1312         {
1313                 .procname       = "percpu_pagelist_fraction",
1314                 .data           = &percpu_pagelist_fraction,
1315                 .maxlen         = sizeof(percpu_pagelist_fraction),
1316                 .mode           = 0644,
1317                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1318                 .extra1         = &zero,
1319         },
1320 #ifdef CONFIG_MMU
1321         {
1322                 .procname       = "max_map_count",
1323                 .data           = &sysctl_max_map_count,
1324                 .maxlen         = sizeof(sysctl_max_map_count),
1325                 .mode           = 0644,
1326                 .proc_handler   = proc_dointvec_minmax,
1327                 .extra1         = &zero,
1328         },
1329 #else
1330         {
1331                 .procname       = "nr_trim_pages",
1332                 .data           = &sysctl_nr_trim_pages,
1333                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1334                 .mode           = 0644,
1335                 .proc_handler   = proc_dointvec_minmax,
1336                 .extra1         = &zero,
1337         },
1338 #endif
1339         {
1340                 .procname       = "laptop_mode",
1341                 .data           = &laptop_mode,
1342                 .maxlen         = sizeof(laptop_mode),
1343                 .mode           = 0644,
1344                 .proc_handler   = proc_dointvec_jiffies,
1345         },
1346         {
1347                 .procname       = "block_dump",
1348                 .data           = &block_dump,
1349                 .maxlen         = sizeof(block_dump),
1350                 .mode           = 0644,
1351                 .proc_handler   = proc_dointvec,
1352                 .extra1         = &zero,
1353         },
1354         {
1355                 .procname       = "vfs_cache_pressure",
1356                 .data           = &sysctl_vfs_cache_pressure,
1357                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1358                 .mode           = 0644,
1359                 .proc_handler   = proc_dointvec,
1360                 .extra1         = &zero,
1361         },
1362 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1363         {
1364                 .procname       = "legacy_va_layout",
1365                 .data           = &sysctl_legacy_va_layout,
1366                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1367                 .mode           = 0644,
1368                 .proc_handler   = proc_dointvec,
1369                 .extra1         = &zero,
1370         },
1371 #endif
1372 #ifdef CONFIG_NUMA
1373         {
1374                 .procname       = "zone_reclaim_mode",
1375                 .data           = &zone_reclaim_mode,
1376                 .maxlen         = sizeof(zone_reclaim_mode),
1377                 .mode           = 0644,
1378                 .proc_handler   = proc_dointvec,
1379                 .extra1         = &zero,
1380         },
1381         {
1382                 .procname       = "min_unmapped_ratio",
1383                 .data           = &sysctl_min_unmapped_ratio,
1384                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1385                 .mode           = 0644,
1386                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1387                 .extra1         = &zero,
1388                 .extra2         = &one_hundred,
1389         },
1390         {
1391                 .procname       = "min_slab_ratio",
1392                 .data           = &sysctl_min_slab_ratio,
1393                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1394                 .mode           = 0644,
1395                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1396                 .extra1         = &zero,
1397                 .extra2         = &one_hundred,
1398         },
1399 #endif
1400 #ifdef CONFIG_SMP
1401         {
1402                 .procname       = "stat_interval",
1403                 .data           = &sysctl_stat_interval,
1404                 .maxlen         = sizeof(sysctl_stat_interval),
1405                 .mode           = 0644,
1406                 .proc_handler   = proc_dointvec_jiffies,
1407         },
1408 #endif
1409 #ifdef CONFIG_MMU
1410         {
1411                 .procname       = "mmap_min_addr",
1412                 .data           = &dac_mmap_min_addr,
1413                 .maxlen         = sizeof(unsigned long),
1414                 .mode           = 0644,
1415                 .proc_handler   = mmap_min_addr_handler,
1416         },
1417 #endif
1418 #ifdef CONFIG_NUMA
1419         {
1420                 .procname       = "numa_zonelist_order",
1421                 .data           = &numa_zonelist_order,
1422                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1423                 .mode           = 0644,
1424                 .proc_handler   = numa_zonelist_order_handler,
1425         },
1426 #endif
1427 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1428    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1429         {
1430                 .procname       = "vdso_enabled",
1431 #ifdef CONFIG_X86_32
1432                 .data           = &vdso32_enabled,
1433                 .maxlen         = sizeof(vdso32_enabled),
1434 #else
1435                 .data           = &vdso_enabled,
1436                 .maxlen         = sizeof(vdso_enabled),
1437 #endif
1438                 .mode           = 0644,
1439                 .proc_handler   = proc_dointvec,
1440                 .extra1         = &zero,
1441         },
1442 #endif
1443 #ifdef CONFIG_HIGHMEM
1444         {
1445                 .procname       = "highmem_is_dirtyable",
1446                 .data           = &vm_highmem_is_dirtyable,
1447                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1448                 .mode           = 0644,
1449                 .proc_handler   = proc_dointvec_minmax,
1450                 .extra1         = &zero,
1451                 .extra2         = &one,
1452         },
1453 #endif
1454 #ifdef CONFIG_MEMORY_FAILURE
1455         {
1456                 .procname       = "memory_failure_early_kill",
1457                 .data           = &sysctl_memory_failure_early_kill,
1458                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1459                 .mode           = 0644,
1460                 .proc_handler   = proc_dointvec_minmax,
1461                 .extra1         = &zero,
1462                 .extra2         = &one,
1463         },
1464         {
1465                 .procname       = "memory_failure_recovery",
1466                 .data           = &sysctl_memory_failure_recovery,
1467                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1468                 .mode           = 0644,
1469                 .proc_handler   = proc_dointvec_minmax,
1470                 .extra1         = &zero,
1471                 .extra2         = &one,
1472         },
1473 #endif
1474         {
1475                 .procname       = "user_reserve_kbytes",
1476                 .data           = &sysctl_user_reserve_kbytes,
1477                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1478                 .mode           = 0644,
1479                 .proc_handler   = proc_doulongvec_minmax,
1480         },
1481         {
1482                 .procname       = "admin_reserve_kbytes",
1483                 .data           = &sysctl_admin_reserve_kbytes,
1484                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1485                 .mode           = 0644,
1486                 .proc_handler   = proc_doulongvec_minmax,
1487         },
1488         { }
1489 };
1490
1491 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1492 static struct ctl_table binfmt_misc_table[] = {
1493         { }
1494 };
1495 #endif
1496
1497 static struct ctl_table fs_table[] = {
1498         {
1499                 .procname       = "inode-nr",
1500                 .data           = &inodes_stat,
1501                 .maxlen         = 2*sizeof(long),
1502                 .mode           = 0444,
1503                 .proc_handler   = proc_nr_inodes,
1504         },
1505         {
1506                 .procname       = "inode-state",
1507                 .data           = &inodes_stat,
1508                 .maxlen         = 7*sizeof(long),
1509                 .mode           = 0444,
1510                 .proc_handler   = proc_nr_inodes,
1511         },
1512         {
1513                 .procname       = "file-nr",
1514                 .data           = &files_stat,
1515                 .maxlen         = sizeof(files_stat),
1516                 .mode           = 0444,
1517                 .proc_handler   = proc_nr_files,
1518         },
1519         {
1520                 .procname       = "file-max",
1521                 .data           = &files_stat.max_files,
1522                 .maxlen         = sizeof(files_stat.max_files),
1523                 .mode           = 0644,
1524                 .proc_handler   = proc_doulongvec_minmax,
1525         },
1526         {
1527                 .procname       = "nr_open",
1528                 .data           = &sysctl_nr_open,
1529                 .maxlen         = sizeof(int),
1530                 .mode           = 0644,
1531                 .proc_handler   = proc_dointvec_minmax,
1532                 .extra1         = &sysctl_nr_open_min,
1533                 .extra2         = &sysctl_nr_open_max,
1534         },
1535         {
1536                 .procname       = "dentry-state",
1537                 .data           = &dentry_stat,
1538                 .maxlen         = 6*sizeof(long),
1539                 .mode           = 0444,
1540                 .proc_handler   = proc_nr_dentry,
1541         },
1542         {
1543                 .procname       = "overflowuid",
1544                 .data           = &fs_overflowuid,
1545                 .maxlen         = sizeof(int),
1546                 .mode           = 0644,
1547                 .proc_handler   = proc_dointvec_minmax,
1548                 .extra1         = &minolduid,
1549                 .extra2         = &maxolduid,
1550         },
1551         {
1552                 .procname       = "overflowgid",
1553                 .data           = &fs_overflowgid,
1554                 .maxlen         = sizeof(int),
1555                 .mode           = 0644,
1556                 .proc_handler   = proc_dointvec_minmax,
1557                 .extra1         = &minolduid,
1558                 .extra2         = &maxolduid,
1559         },
1560 #ifdef CONFIG_FILE_LOCKING
1561         {
1562                 .procname       = "leases-enable",
1563                 .data           = &leases_enable,
1564                 .maxlen         = sizeof(int),
1565                 .mode           = 0644,
1566                 .proc_handler   = proc_dointvec,
1567         },
1568 #endif
1569 #ifdef CONFIG_DNOTIFY
1570         {
1571                 .procname       = "dir-notify-enable",
1572                 .data           = &dir_notify_enable,
1573                 .maxlen         = sizeof(int),
1574                 .mode           = 0644,
1575                 .proc_handler   = proc_dointvec,
1576         },
1577 #endif
1578 #ifdef CONFIG_MMU
1579 #ifdef CONFIG_FILE_LOCKING
1580         {
1581                 .procname       = "lease-break-time",
1582                 .data           = &lease_break_time,
1583                 .maxlen         = sizeof(int),
1584                 .mode           = 0644,
1585                 .proc_handler   = proc_dointvec,
1586         },
1587 #endif
1588 #ifdef CONFIG_AIO
1589         {
1590                 .procname       = "aio-nr",
1591                 .data           = &aio_nr,
1592                 .maxlen         = sizeof(aio_nr),
1593                 .mode           = 0444,
1594                 .proc_handler   = proc_doulongvec_minmax,
1595         },
1596         {
1597                 .procname       = "aio-max-nr",
1598                 .data           = &aio_max_nr,
1599                 .maxlen         = sizeof(aio_max_nr),
1600                 .mode           = 0644,
1601                 .proc_handler   = proc_doulongvec_minmax,
1602         },
1603 #endif /* CONFIG_AIO */
1604 #ifdef CONFIG_INOTIFY_USER
1605         {
1606                 .procname       = "inotify",
1607                 .mode           = 0555,
1608                 .child          = inotify_table,
1609         },
1610 #endif
1611 #ifdef CONFIG_EPOLL
1612         {
1613                 .procname       = "epoll",
1614                 .mode           = 0555,
1615                 .child          = epoll_table,
1616         },
1617 #endif
1618 #endif
1619         {
1620                 .procname       = "protected_symlinks",
1621                 .data           = &sysctl_protected_symlinks,
1622                 .maxlen         = sizeof(int),
1623                 .mode           = 0600,
1624                 .proc_handler   = proc_dointvec_minmax,
1625                 .extra1         = &zero,
1626                 .extra2         = &one,
1627         },
1628         {
1629                 .procname       = "protected_hardlinks",
1630                 .data           = &sysctl_protected_hardlinks,
1631                 .maxlen         = sizeof(int),
1632                 .mode           = 0600,
1633                 .proc_handler   = proc_dointvec_minmax,
1634                 .extra1         = &zero,
1635                 .extra2         = &one,
1636         },
1637         {
1638                 .procname       = "suid_dumpable",
1639                 .data           = &suid_dumpable,
1640                 .maxlen         = sizeof(int),
1641                 .mode           = 0644,
1642                 .proc_handler   = proc_dointvec_minmax_coredump,
1643                 .extra1         = &zero,
1644                 .extra2         = &two,
1645         },
1646 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1647         {
1648                 .procname       = "binfmt_misc",
1649                 .mode           = 0555,
1650                 .child          = binfmt_misc_table,
1651         },
1652 #endif
1653         {
1654                 .procname       = "pipe-max-size",
1655                 .data           = &pipe_max_size,
1656                 .maxlen         = sizeof(int),
1657                 .mode           = 0644,
1658                 .proc_handler   = &pipe_proc_fn,
1659                 .extra1         = &pipe_min_size,
1660         },
1661         { }
1662 };
1663
1664 static struct ctl_table debug_table[] = {
1665 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1666         {
1667                 .procname       = "exception-trace",
1668                 .data           = &show_unhandled_signals,
1669                 .maxlen         = sizeof(int),
1670                 .mode           = 0644,
1671                 .proc_handler   = proc_dointvec
1672         },
1673 #endif
1674 #if defined(CONFIG_OPTPROBES)
1675         {
1676                 .procname       = "kprobes-optimization",
1677                 .data           = &sysctl_kprobes_optimization,
1678                 .maxlen         = sizeof(int),
1679                 .mode           = 0644,
1680                 .proc_handler   = proc_kprobes_optimization_handler,
1681                 .extra1         = &zero,
1682                 .extra2         = &one,
1683         },
1684 #endif
1685         { }
1686 };
1687
1688 static struct ctl_table dev_table[] = {
1689         { }
1690 };
1691
1692 int __init sysctl_init(void)
1693 {
1694         struct ctl_table_header *hdr;
1695
1696         hdr = register_sysctl_table(sysctl_base_table);
1697         kmemleak_not_leak(hdr);
1698         return 0;
1699 }
1700
1701 #endif /* CONFIG_SYSCTL */
1702
1703 /*
1704  * /proc/sys support
1705  */
1706
1707 #ifdef CONFIG_PROC_SYSCTL
1708
1709 static int _proc_do_string(char *data, int maxlen, int write,
1710                            char __user *buffer,
1711                            size_t *lenp, loff_t *ppos)
1712 {
1713         size_t len;
1714         char __user *p;
1715         char c;
1716
1717         if (!data || !maxlen || !*lenp) {
1718                 *lenp = 0;
1719                 return 0;
1720         }
1721
1722         if (write) {
1723                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1724                         /* Only continue writes not past the end of buffer. */
1725                         len = strlen(data);
1726                         if (len > maxlen - 1)
1727                                 len = maxlen - 1;
1728
1729                         if (*ppos > len)
1730                                 return 0;
1731                         len = *ppos;
1732                 } else {
1733                         /* Start writing from beginning of buffer. */
1734                         len = 0;
1735                 }
1736
1737                 *ppos += *lenp;
1738                 p = buffer;
1739                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1740                         if (get_user(c, p++))
1741                                 return -EFAULT;
1742                         if (c == 0 || c == '\n')
1743                                 break;
1744                         data[len++] = c;
1745                 }
1746                 data[len] = 0;
1747         } else {
1748                 len = strlen(data);
1749                 if (len > maxlen)
1750                         len = maxlen;
1751
1752                 if (*ppos > len) {
1753                         *lenp = 0;
1754                         return 0;
1755                 }
1756
1757                 data += *ppos;
1758                 len  -= *ppos;
1759
1760                 if (len > *lenp)
1761                         len = *lenp;
1762                 if (len)
1763                         if (copy_to_user(buffer, data, len))
1764                                 return -EFAULT;
1765                 if (len < *lenp) {
1766                         if (put_user('\n', buffer + len))
1767                                 return -EFAULT;
1768                         len++;
1769                 }
1770                 *lenp = len;
1771                 *ppos += len;
1772         }
1773         return 0;
1774 }
1775
1776 static void warn_sysctl_write(struct ctl_table *table)
1777 {
1778         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1779                 "This will not be supported in the future. To silence this\n"
1780                 "warning, set kernel.sysctl_writes_strict = -1\n",
1781                 current->comm, table->procname);
1782 }
1783
1784 /**
1785  * proc_dostring - read a string sysctl
1786  * @table: the sysctl table
1787  * @write: %TRUE if this is a write to the sysctl file
1788  * @buffer: the user buffer
1789  * @lenp: the size of the user buffer
1790  * @ppos: file position
1791  *
1792  * Reads/writes a string from/to the user buffer. If the kernel
1793  * buffer provided is not large enough to hold the string, the
1794  * string is truncated. The copied string is %NULL-terminated.
1795  * If the string is being read by the user process, it is copied
1796  * and a newline '\n' is added. It is truncated if the buffer is
1797  * not large enough.
1798  *
1799  * Returns 0 on success.
1800  */
1801 int proc_dostring(struct ctl_table *table, int write,
1802                   void __user *buffer, size_t *lenp, loff_t *ppos)
1803 {
1804         if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1805                 warn_sysctl_write(table);
1806
1807         return _proc_do_string((char *)(table->data), table->maxlen, write,
1808                                (char __user *)buffer, lenp, ppos);
1809 }
1810
1811 static size_t proc_skip_spaces(char **buf)
1812 {
1813         size_t ret;
1814         char *tmp = skip_spaces(*buf);
1815         ret = tmp - *buf;
1816         *buf = tmp;
1817         return ret;
1818 }
1819
1820 static void proc_skip_char(char **buf, size_t *size, const char v)
1821 {
1822         while (*size) {
1823                 if (**buf != v)
1824                         break;
1825                 (*size)--;
1826                 (*buf)++;
1827         }
1828 }
1829
1830 #define TMPBUFLEN 22
1831 /**
1832  * proc_get_long - reads an ASCII formatted integer from a user buffer
1833  *
1834  * @buf: a kernel buffer
1835  * @size: size of the kernel buffer
1836  * @val: this is where the number will be stored
1837  * @neg: set to %TRUE if number is negative
1838  * @perm_tr: a vector which contains the allowed trailers
1839  * @perm_tr_len: size of the perm_tr vector
1840  * @tr: pointer to store the trailer character
1841  *
1842  * In case of success %0 is returned and @buf and @size are updated with
1843  * the amount of bytes read. If @tr is non-NULL and a trailing
1844  * character exists (size is non-zero after returning from this
1845  * function), @tr is updated with the trailing character.
1846  */
1847 static int proc_get_long(char **buf, size_t *size,
1848                           unsigned long *val, bool *neg,
1849                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1850 {
1851         int len;
1852         char *p, tmp[TMPBUFLEN];
1853
1854         if (!*size)
1855                 return -EINVAL;
1856
1857         len = *size;
1858         if (len > TMPBUFLEN - 1)
1859                 len = TMPBUFLEN - 1;
1860
1861         memcpy(tmp, *buf, len);
1862
1863         tmp[len] = 0;
1864         p = tmp;
1865         if (*p == '-' && *size > 1) {
1866                 *neg = true;
1867                 p++;
1868         } else
1869                 *neg = false;
1870         if (!isdigit(*p))
1871                 return -EINVAL;
1872
1873         *val = simple_strtoul(p, &p, 0);
1874
1875         len = p - tmp;
1876
1877         /* We don't know if the next char is whitespace thus we may accept
1878          * invalid integers (e.g. 1234...a) or two integers instead of one
1879          * (e.g. 123...1). So lets not allow such large numbers. */
1880         if (len == TMPBUFLEN - 1)
1881                 return -EINVAL;
1882
1883         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1884                 return -EINVAL;
1885
1886         if (tr && (len < *size))
1887                 *tr = *p;
1888
1889         *buf += len;
1890         *size -= len;
1891
1892         return 0;
1893 }
1894
1895 /**
1896  * proc_put_long - converts an integer to a decimal ASCII formatted string
1897  *
1898  * @buf: the user buffer
1899  * @size: the size of the user buffer
1900  * @val: the integer to be converted
1901  * @neg: sign of the number, %TRUE for negative
1902  *
1903  * In case of success %0 is returned and @buf and @size are updated with
1904  * the amount of bytes written.
1905  */
1906 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1907                           bool neg)
1908 {
1909         int len;
1910         char tmp[TMPBUFLEN], *p = tmp;
1911
1912         sprintf(p, "%s%lu", neg ? "-" : "", val);
1913         len = strlen(tmp);
1914         if (len > *size)
1915                 len = *size;
1916         if (copy_to_user(*buf, tmp, len))
1917                 return -EFAULT;
1918         *size -= len;
1919         *buf += len;
1920         return 0;
1921 }
1922 #undef TMPBUFLEN
1923
1924 static int proc_put_char(void __user **buf, size_t *size, char c)
1925 {
1926         if (*size) {
1927                 char __user **buffer = (char __user **)buf;
1928                 if (put_user(c, *buffer))
1929                         return -EFAULT;
1930                 (*size)--, (*buffer)++;
1931                 *buf = *buffer;
1932         }
1933         return 0;
1934 }
1935
1936 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1937                                  int *valp,
1938                                  int write, void *data)
1939 {
1940         if (write) {
1941                 *valp = *negp ? -*lvalp : *lvalp;
1942         } else {
1943                 int val = *valp;
1944                 if (val < 0) {
1945                         *negp = true;
1946                         *lvalp = (unsigned long)-val;
1947                 } else {
1948                         *negp = false;
1949                         *lvalp = (unsigned long)val;
1950                 }
1951         }
1952         return 0;
1953 }
1954
1955 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1956
1957 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1958                   int write, void __user *buffer,
1959                   size_t *lenp, loff_t *ppos,
1960                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1961                               int write, void *data),
1962                   void *data)
1963 {
1964         int *i, vleft, first = 1, err = 0;
1965         unsigned long page = 0;
1966         size_t left;
1967         char *kbuf;
1968
1969         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1970                 *lenp = 0;
1971                 return 0;
1972         }
1973
1974         i = (int *) tbl_data;
1975         vleft = table->maxlen / sizeof(*i);
1976         left = *lenp;
1977
1978         if (!conv)
1979                 conv = do_proc_dointvec_conv;
1980
1981         if (write) {
1982                 if (*ppos) {
1983                         switch (sysctl_writes_strict) {
1984                         case SYSCTL_WRITES_STRICT:
1985                                 goto out;
1986                         case SYSCTL_WRITES_WARN:
1987                                 warn_sysctl_write(table);
1988                                 break;
1989                         default:
1990                                 break;
1991                         }
1992                 }
1993
1994                 if (left > PAGE_SIZE - 1)
1995                         left = PAGE_SIZE - 1;
1996                 page = __get_free_page(GFP_TEMPORARY);
1997                 kbuf = (char *) page;
1998                 if (!kbuf)
1999                         return -ENOMEM;
2000                 if (copy_from_user(kbuf, buffer, left)) {
2001                         err = -EFAULT;
2002                         goto free;
2003                 }
2004                 kbuf[left] = 0;
2005         }
2006
2007         for (; left && vleft--; i++, first=0) {
2008                 unsigned long lval;
2009                 bool neg;
2010
2011                 if (write) {
2012                         left -= proc_skip_spaces(&kbuf);
2013
2014                         if (!left)
2015                                 break;
2016                         err = proc_get_long(&kbuf, &left, &lval, &neg,
2017                                              proc_wspace_sep,
2018                                              sizeof(proc_wspace_sep), NULL);
2019                         if (err)
2020                                 break;
2021                         if (conv(&neg, &lval, i, 1, data)) {
2022                                 err = -EINVAL;
2023                                 break;
2024                         }
2025                 } else {
2026                         if (conv(&neg, &lval, i, 0, data)) {
2027                                 err = -EINVAL;
2028                                 break;
2029                         }
2030                         if (!first)
2031                                 err = proc_put_char(&buffer, &left, '\t');
2032                         if (err)
2033                                 break;
2034                         err = proc_put_long(&buffer, &left, lval, neg);
2035                         if (err)
2036                                 break;
2037                 }
2038         }
2039
2040         if (!write && !first && left && !err)
2041                 err = proc_put_char(&buffer, &left, '\n');
2042         if (write && !err && left)
2043                 left -= proc_skip_spaces(&kbuf);
2044 free:
2045         if (write) {
2046                 free_page(page);
2047                 if (first)
2048                         return err ? : -EINVAL;
2049         }
2050         *lenp -= left;
2051 out:
2052         *ppos += *lenp;
2053         return err;
2054 }
2055
2056 static int do_proc_dointvec(struct ctl_table *table, int write,
2057                   void __user *buffer, size_t *lenp, loff_t *ppos,
2058                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2059                               int write, void *data),
2060                   void *data)
2061 {
2062         return __do_proc_dointvec(table->data, table, write,
2063                         buffer, lenp, ppos, conv, data);
2064 }
2065
2066 /**
2067  * proc_dointvec - read a vector of integers
2068  * @table: the sysctl table
2069  * @write: %TRUE if this is a write to the sysctl file
2070  * @buffer: the user buffer
2071  * @lenp: the size of the user buffer
2072  * @ppos: file position
2073  *
2074  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2075  * values from/to the user buffer, treated as an ASCII string.
2076  *
2077  * Returns 0 on success.
2078  */
2079 int proc_dointvec(struct ctl_table *table, int write,
2080                      void __user *buffer, size_t *lenp, loff_t *ppos)
2081 {
2082     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2083                             NULL,NULL);
2084 }
2085
2086 /*
2087  * Taint values can only be increased
2088  * This means we can safely use a temporary.
2089  */
2090 static int proc_taint(struct ctl_table *table, int write,
2091                                void __user *buffer, size_t *lenp, loff_t *ppos)
2092 {
2093         struct ctl_table t;
2094         unsigned long tmptaint = get_taint();
2095         int err;
2096
2097         if (write && !capable(CAP_SYS_ADMIN))
2098                 return -EPERM;
2099
2100         t = *table;
2101         t.data = &tmptaint;
2102         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2103         if (err < 0)
2104                 return err;
2105
2106         if (write) {
2107                 /*
2108                  * Poor man's atomic or. Not worth adding a primitive
2109                  * to everyone's atomic.h for this
2110                  */
2111                 int i;
2112                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2113                         if ((tmptaint >> i) & 1)
2114                                 add_taint(i, LOCKDEP_STILL_OK);
2115                 }
2116         }
2117
2118         return err;
2119 }
2120
2121 #ifdef CONFIG_PRINTK
2122 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2123                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2124 {
2125         if (write && !capable(CAP_SYS_ADMIN))
2126                 return -EPERM;
2127
2128         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2129 }
2130 #endif
2131
2132 struct do_proc_dointvec_minmax_conv_param {
2133         int *min;
2134         int *max;
2135 };
2136
2137 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2138                                         int *valp,
2139                                         int write, void *data)
2140 {
2141         struct do_proc_dointvec_minmax_conv_param *param = data;
2142         if (write) {
2143                 int val = *negp ? -*lvalp : *lvalp;
2144                 if ((param->min && *param->min > val) ||
2145                     (param->max && *param->max < val))
2146                         return -EINVAL;
2147                 *valp = val;
2148         } else {
2149                 int val = *valp;
2150                 if (val < 0) {
2151                         *negp = true;
2152                         *lvalp = (unsigned long)-val;
2153                 } else {
2154                         *negp = false;
2155                         *lvalp = (unsigned long)val;
2156                 }
2157         }
2158         return 0;
2159 }
2160
2161 /**
2162  * proc_dointvec_minmax - read a vector of integers 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 int) integer
2170  * values from/to the user buffer, treated as an ASCII string.
2171  *
2172  * This routine will ensure the values are within the range specified by
2173  * table->extra1 (min) and table->extra2 (max).
2174  *
2175  * Returns 0 on success.
2176  */
2177 int proc_dointvec_minmax(struct ctl_table *table, int write,
2178                   void __user *buffer, size_t *lenp, loff_t *ppos)
2179 {
2180         struct do_proc_dointvec_minmax_conv_param param = {
2181                 .min = (int *) table->extra1,
2182                 .max = (int *) table->extra2,
2183         };
2184         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2185                                 do_proc_dointvec_minmax_conv, &param);
2186 }
2187
2188 static void validate_coredump_safety(void)
2189 {
2190 #ifdef CONFIG_COREDUMP
2191         if (suid_dumpable == SUID_DUMP_ROOT &&
2192             core_pattern[0] != '/' && core_pattern[0] != '|') {
2193                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2194                         "suid_dumpable=2. Pipe handler or fully qualified "\
2195                         "core dump path required.\n");
2196         }
2197 #endif
2198 }
2199
2200 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2201                 void __user *buffer, size_t *lenp, loff_t *ppos)
2202 {
2203         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2204         if (!error)
2205                 validate_coredump_safety();
2206         return error;
2207 }
2208
2209 #ifdef CONFIG_COREDUMP
2210 static int proc_dostring_coredump(struct ctl_table *table, int write,
2211                   void __user *buffer, size_t *lenp, loff_t *ppos)
2212 {
2213         int error = proc_dostring(table, write, buffer, lenp, ppos);
2214         if (!error)
2215                 validate_coredump_safety();
2216         return error;
2217 }
2218 #endif
2219
2220 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2221                                      void __user *buffer,
2222                                      size_t *lenp, loff_t *ppos,
2223                                      unsigned long convmul,
2224                                      unsigned long convdiv)
2225 {
2226         unsigned long *i, *min, *max;
2227         int vleft, first = 1, err = 0;
2228         unsigned long page = 0;
2229         size_t left;
2230         char *kbuf;
2231
2232         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2233                 *lenp = 0;
2234                 return 0;
2235         }
2236
2237         i = (unsigned long *) data;
2238         min = (unsigned long *) table->extra1;
2239         max = (unsigned long *) table->extra2;
2240         vleft = table->maxlen / sizeof(unsigned long);
2241         left = *lenp;
2242
2243         if (write) {
2244                 if (*ppos) {
2245                         switch (sysctl_writes_strict) {
2246                         case SYSCTL_WRITES_STRICT:
2247                                 goto out;
2248                         case SYSCTL_WRITES_WARN:
2249                                 warn_sysctl_write(table);
2250                                 break;
2251                         default:
2252                                 break;
2253                         }
2254                 }
2255
2256                 if (left > PAGE_SIZE - 1)
2257                         left = PAGE_SIZE - 1;
2258                 page = __get_free_page(GFP_TEMPORARY);
2259                 kbuf = (char *) page;
2260                 if (!kbuf)
2261                         return -ENOMEM;
2262                 if (copy_from_user(kbuf, buffer, left)) {
2263                         err = -EFAULT;
2264                         goto free;
2265                 }
2266                 kbuf[left] = 0;
2267         }
2268
2269         for (; left && vleft--; i++, first = 0) {
2270                 unsigned long val;
2271
2272                 if (write) {
2273                         bool neg;
2274
2275                         left -= proc_skip_spaces(&kbuf);
2276
2277                         err = proc_get_long(&kbuf, &left, &val, &neg,
2278                                              proc_wspace_sep,
2279                                              sizeof(proc_wspace_sep), NULL);
2280                         if (err)
2281                                 break;
2282                         if (neg)
2283                                 continue;
2284                         if ((min && val < *min) || (max && val > *max))
2285                                 continue;
2286                         *i = val;
2287                 } else {
2288                         val = convdiv * (*i) / convmul;
2289                         if (!first) {
2290                                 err = proc_put_char(&buffer, &left, '\t');
2291                                 if (err)
2292                                         break;
2293                         }
2294                         err = proc_put_long(&buffer, &left, val, false);
2295                         if (err)
2296                                 break;
2297                 }
2298         }
2299
2300         if (!write && !first && left && !err)
2301                 err = proc_put_char(&buffer, &left, '\n');
2302         if (write && !err)
2303                 left -= proc_skip_spaces(&kbuf);
2304 free:
2305         if (write) {
2306                 free_page(page);
2307                 if (first)
2308                         return err ? : -EINVAL;
2309         }
2310         *lenp -= left;
2311 out:
2312         *ppos += *lenp;
2313         return err;
2314 }
2315
2316 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2317                                      void __user *buffer,
2318                                      size_t *lenp, loff_t *ppos,
2319                                      unsigned long convmul,
2320                                      unsigned long convdiv)
2321 {
2322         return __do_proc_doulongvec_minmax(table->data, table, write,
2323                         buffer, lenp, ppos, convmul, convdiv);
2324 }
2325
2326 /**
2327  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2328  * @table: the sysctl table
2329  * @write: %TRUE if this is a write to the sysctl file
2330  * @buffer: the user buffer
2331  * @lenp: the size of the user buffer
2332  * @ppos: file position
2333  *
2334  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2335  * values from/to the user buffer, treated as an ASCII string.
2336  *
2337  * This routine will ensure the values are within the range specified by
2338  * table->extra1 (min) and table->extra2 (max).
2339  *
2340  * Returns 0 on success.
2341  */
2342 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2343                            void __user *buffer, size_t *lenp, loff_t *ppos)
2344 {
2345     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2346 }
2347
2348 /**
2349  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2350  * @table: the sysctl table
2351  * @write: %TRUE if this is a write to the sysctl file
2352  * @buffer: the user buffer
2353  * @lenp: the size of the user buffer
2354  * @ppos: file position
2355  *
2356  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2357  * values from/to the user buffer, treated as an ASCII string. The values
2358  * are treated as milliseconds, and converted to jiffies when they are stored.
2359  *
2360  * This routine will ensure the values are within the range specified by
2361  * table->extra1 (min) and table->extra2 (max).
2362  *
2363  * Returns 0 on success.
2364  */
2365 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2366                                       void __user *buffer,
2367                                       size_t *lenp, loff_t *ppos)
2368 {
2369     return do_proc_doulongvec_minmax(table, write, buffer,
2370                                      lenp, ppos, HZ, 1000l);
2371 }
2372
2373
2374 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2375                                          int *valp,
2376                                          int write, void *data)
2377 {
2378         if (write) {
2379                 if (*lvalp > LONG_MAX / HZ)
2380                         return 1;
2381                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2382         } else {
2383                 int val = *valp;
2384                 unsigned long lval;
2385                 if (val < 0) {
2386                         *negp = true;
2387                         lval = (unsigned long)-val;
2388                 } else {
2389                         *negp = false;
2390                         lval = (unsigned long)val;
2391                 }
2392                 *lvalp = lval / HZ;
2393         }
2394         return 0;
2395 }
2396
2397 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2398                                                 int *valp,
2399                                                 int write, void *data)
2400 {
2401         if (write) {
2402                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2403                         return 1;
2404                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2405         } else {
2406                 int val = *valp;
2407                 unsigned long lval;
2408                 if (val < 0) {
2409                         *negp = true;
2410                         lval = (unsigned long)-val;
2411                 } else {
2412                         *negp = false;
2413                         lval = (unsigned long)val;
2414                 }
2415                 *lvalp = jiffies_to_clock_t(lval);
2416         }
2417         return 0;
2418 }
2419
2420 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2421                                             int *valp,
2422                                             int write, void *data)
2423 {
2424         if (write) {
2425                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2426
2427                 if (jif > INT_MAX)
2428                         return 1;
2429                 *valp = (int)jif;
2430         } else {
2431                 int val = *valp;
2432                 unsigned long lval;
2433                 if (val < 0) {
2434                         *negp = true;
2435                         lval = (unsigned long)-val;
2436                 } else {
2437                         *negp = false;
2438                         lval = (unsigned long)val;
2439                 }
2440                 *lvalp = jiffies_to_msecs(lval);
2441         }
2442         return 0;
2443 }
2444
2445 /**
2446  * proc_dointvec_jiffies - read a vector of integers as seconds
2447  * @table: the sysctl table
2448  * @write: %TRUE if this is a write to the sysctl file
2449  * @buffer: the user buffer
2450  * @lenp: the size of the user buffer
2451  * @ppos: file position
2452  *
2453  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2454  * values from/to the user buffer, treated as an ASCII string.
2455  * The values read are assumed to be in seconds, and are converted into
2456  * jiffies.
2457  *
2458  * Returns 0 on success.
2459  */
2460 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2461                           void __user *buffer, size_t *lenp, loff_t *ppos)
2462 {
2463     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2464                             do_proc_dointvec_jiffies_conv,NULL);
2465 }
2466
2467 /**
2468  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2469  * @table: the sysctl table
2470  * @write: %TRUE if this is a write to the sysctl file
2471  * @buffer: the user buffer
2472  * @lenp: the size of the user buffer
2473  * @ppos: pointer to the file position
2474  *
2475  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2476  * values from/to the user buffer, treated as an ASCII string.
2477  * The values read are assumed to be in 1/USER_HZ seconds, and
2478  * are converted into jiffies.
2479  *
2480  * Returns 0 on success.
2481  */
2482 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2483                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2484 {
2485     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2486                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2487 }
2488
2489 /**
2490  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2491  * @table: the sysctl table
2492  * @write: %TRUE if this is a write to the sysctl file
2493  * @buffer: the user buffer
2494  * @lenp: the size of the user buffer
2495  * @ppos: file position
2496  * @ppos: the current position in the file
2497  *
2498  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2499  * values from/to the user buffer, treated as an ASCII string.
2500  * The values read are assumed to be in 1/1000 seconds, and
2501  * are converted into jiffies.
2502  *
2503  * Returns 0 on success.
2504  */
2505 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2506                              void __user *buffer, size_t *lenp, loff_t *ppos)
2507 {
2508         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2509                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2510 }
2511
2512 static int proc_do_cad_pid(struct ctl_table *table, int write,
2513                            void __user *buffer, size_t *lenp, loff_t *ppos)
2514 {
2515         struct pid *new_pid;
2516         pid_t tmp;
2517         int r;
2518
2519         tmp = pid_vnr(cad_pid);
2520
2521         r = __do_proc_dointvec(&tmp, table, write, buffer,
2522                                lenp, ppos, NULL, NULL);
2523         if (r || !write)
2524                 return r;
2525
2526         new_pid = find_get_pid(tmp);
2527         if (!new_pid)
2528                 return -ESRCH;
2529
2530         put_pid(xchg(&cad_pid, new_pid));
2531         return 0;
2532 }
2533
2534 /**
2535  * proc_do_large_bitmap - read/write from/to a large bitmap
2536  * @table: the sysctl table
2537  * @write: %TRUE if this is a write to the sysctl file
2538  * @buffer: the user buffer
2539  * @lenp: the size of the user buffer
2540  * @ppos: file position
2541  *
2542  * The bitmap is stored at table->data and the bitmap length (in bits)
2543  * in table->maxlen.
2544  *
2545  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2546  * large bitmaps may be represented in a compact manner. Writing into
2547  * the file will clear the bitmap then update it with the given input.
2548  *
2549  * Returns 0 on success.
2550  */
2551 int proc_do_large_bitmap(struct ctl_table *table, int write,
2552                          void __user *buffer, size_t *lenp, loff_t *ppos)
2553 {
2554         int err = 0;
2555         bool first = 1;
2556         size_t left = *lenp;
2557         unsigned long bitmap_len = table->maxlen;
2558         unsigned long *bitmap = *(unsigned long **) table->data;
2559         unsigned long *tmp_bitmap = NULL;
2560         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2561
2562         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2563                 *lenp = 0;
2564                 return 0;
2565         }
2566
2567         if (write) {
2568                 unsigned long page = 0;
2569                 char *kbuf;
2570
2571                 if (left > PAGE_SIZE - 1)
2572                         left = PAGE_SIZE - 1;
2573
2574                 page = __get_free_page(GFP_TEMPORARY);
2575                 kbuf = (char *) page;
2576                 if (!kbuf)
2577                         return -ENOMEM;
2578                 if (copy_from_user(kbuf, buffer, left)) {
2579                         free_page(page);
2580                         return -EFAULT;
2581                 }
2582                 kbuf[left] = 0;
2583
2584                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2585                                      GFP_KERNEL);
2586                 if (!tmp_bitmap) {
2587                         free_page(page);
2588                         return -ENOMEM;
2589                 }
2590                 proc_skip_char(&kbuf, &left, '\n');
2591                 while (!err && left) {
2592                         unsigned long val_a, val_b;
2593                         bool neg;
2594
2595                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2596                                              sizeof(tr_a), &c);
2597                         if (err)
2598                                 break;
2599                         if (val_a >= bitmap_len || neg) {
2600                                 err = -EINVAL;
2601                                 break;
2602                         }
2603
2604                         val_b = val_a;
2605                         if (left) {
2606                                 kbuf++;
2607                                 left--;
2608                         }
2609
2610                         if (c == '-') {
2611                                 err = proc_get_long(&kbuf, &left, &val_b,
2612                                                      &neg, tr_b, sizeof(tr_b),
2613                                                      &c);
2614                                 if (err)
2615                                         break;
2616                                 if (val_b >= bitmap_len || neg ||
2617                                     val_a > val_b) {
2618                                         err = -EINVAL;
2619                                         break;
2620                                 }
2621                                 if (left) {
2622                                         kbuf++;
2623                                         left--;
2624                                 }
2625                         }
2626
2627                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2628                         first = 0;
2629                         proc_skip_char(&kbuf, &left, '\n');
2630                 }
2631                 free_page(page);
2632         } else {
2633                 unsigned long bit_a, bit_b = 0;
2634
2635                 while (left) {
2636                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2637                         if (bit_a >= bitmap_len)
2638                                 break;
2639                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2640                                                    bit_a + 1) - 1;
2641
2642                         if (!first) {
2643                                 err = proc_put_char(&buffer, &left, ',');
2644                                 if (err)
2645                                         break;
2646                         }
2647                         err = proc_put_long(&buffer, &left, bit_a, false);
2648                         if (err)
2649                                 break;
2650                         if (bit_a != bit_b) {
2651                                 err = proc_put_char(&buffer, &left, '-');
2652                                 if (err)
2653                                         break;
2654                                 err = proc_put_long(&buffer, &left, bit_b, false);
2655                                 if (err)
2656                                         break;
2657                         }
2658
2659                         first = 0; bit_b++;
2660                 }
2661                 if (!err)
2662                         err = proc_put_char(&buffer, &left, '\n');
2663         }
2664
2665         if (!err) {
2666                 if (write) {
2667                         if (*ppos)
2668                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2669                         else
2670                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2671                 }
2672                 kfree(tmp_bitmap);
2673                 *lenp -= left;
2674                 *ppos += *lenp;
2675                 return 0;
2676         } else {
2677                 kfree(tmp_bitmap);
2678                 return err;
2679         }
2680 }
2681
2682 #else /* CONFIG_PROC_SYSCTL */
2683
2684 int proc_dostring(struct ctl_table *table, int write,
2685                   void __user *buffer, size_t *lenp, loff_t *ppos)
2686 {
2687         return -ENOSYS;
2688 }
2689
2690 int proc_dointvec(struct ctl_table *table, int write,
2691                   void __user *buffer, size_t *lenp, loff_t *ppos)
2692 {
2693         return -ENOSYS;
2694 }
2695
2696 int proc_dointvec_minmax(struct ctl_table *table, int write,
2697                     void __user *buffer, size_t *lenp, loff_t *ppos)
2698 {
2699         return -ENOSYS;
2700 }
2701
2702 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2703                     void __user *buffer, size_t *lenp, loff_t *ppos)
2704 {
2705         return -ENOSYS;
2706 }
2707
2708 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2709                     void __user *buffer, size_t *lenp, loff_t *ppos)
2710 {
2711         return -ENOSYS;
2712 }
2713
2714 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2715                              void __user *buffer, size_t *lenp, loff_t *ppos)
2716 {
2717         return -ENOSYS;
2718 }
2719
2720 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2721                     void __user *buffer, size_t *lenp, loff_t *ppos)
2722 {
2723         return -ENOSYS;
2724 }
2725
2726 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2727                                       void __user *buffer,
2728                                       size_t *lenp, loff_t *ppos)
2729 {
2730     return -ENOSYS;
2731 }
2732
2733
2734 #endif /* CONFIG_PROC_SYSCTL */
2735
2736 /*
2737  * No sense putting this after each symbol definition, twice,
2738  * exception granted :-)
2739  */
2740 EXPORT_SYMBOL(proc_dointvec);
2741 EXPORT_SYMBOL(proc_dointvec_jiffies);
2742 EXPORT_SYMBOL(proc_dointvec_minmax);
2743 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2744 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2745 EXPORT_SYMBOL(proc_dostring);
2746 EXPORT_SYMBOL(proc_doulongvec_minmax);
2747 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);