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/aio.h>
  23 #include <linux/mm.h>
  24 #include <linux/swap.h>
  25 #include <linux/slab.h>
  26 #include <linux/sysctl.h>
  27 #include <linux/bitmap.h>
  28 #include <linux/signal.h>
  29 #include <linux/printk.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/security.h>
  32 #include <linux/ctype.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/sched/coredump.h>
  66 #include <linux/kexec.h>
  67 #include <linux/bpf.h>
  68 #include <linux/mount.h>
  69 #include <linux/pipe_fs_i.h>
  70
  71 #include <linux/uaccess.h>
  72 #include <asm/processor.h>
  73
  74 #ifdef CONFIG_X86
  75 #include <asm/nmi.h>
  76 #include <asm/stacktrace.h>
  77 #include <asm/io.h>
  78 #endif
  79 #ifdef CONFIG_SPARC
  80 #include <asm/setup.h>
  81 #endif
  82 #ifdef CONFIG_BSD_PROCESS_ACCT
  83 #include <linux/acct.h>
  84 #endif
  85 #ifdef CONFIG_RT_MUTEXES
  86 #include <linux/rtmutex.h>
  87 #endif
  88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  89 #include <linux/lockdep.h>
  90 #endif
  91 #ifdef CONFIG_CHR_DEV_SG
  92 #include <scsi/sg.h>
  93 #endif
  94
  95 #ifdef CONFIG_LOCKUP_DETECTOR
  96 #include <linux/nmi.h>
  97 #endif
  98
  99 #if defined(CONFIG_SYSCTL)
 100
 101 /* External variables not in a header file. */
 102 extern int suid_dumpable;
 103 #ifdef CONFIG_COREDUMP
 104 extern int core_uses_pid;
 105 extern char core_pattern[];
 106 extern unsigned int core_pipe_limit;
 107 #endif
 108 extern int pid_max;
 109 extern int pid_max_min, pid_max_max;
 110 extern int percpu_pagelist_fraction;
 111 extern int latencytop_enabled;
 112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
 113 #ifndef CONFIG_MMU
 114 extern int sysctl_nr_trim_pages;
 115 #endif
 116
 117 /* Constants used for minimum and  maximum */
 118 #ifdef CONFIG_LOCKUP_DETECTOR
 119 static int sixty = 60;
 120 #endif
 121
 122 static int __maybe_unused neg_one = -1;
 123
 124 static int zero;
 125 static int __maybe_unused one = 1;
 126 static int __maybe_unused two = 2;
 127 static int __maybe_unused four = 4;
 128 static unsigned long zero_ul;
 129 static unsigned long one_ul = 1;
 130 static unsigned long long_max = LONG_MAX;
 131 static int one_hundred = 100;
 132 static int one_thousand = 1000;
 133 #ifdef CONFIG_PRINTK
 134 static int ten_thousand = 10000;
 135 #endif
 136 #ifdef CONFIG_PERF_EVENTS
 137 static int six_hundred_forty_kb = 640 * 1024;
 138 #endif
 139
 140 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 141 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 142
 143 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 144 static int maxolduid = 65535;
 145 static int minolduid;
 146
 147 static int ngroups_max = NGROUPS_MAX;
 148 static const int cap_last_cap = CAP_LAST_CAP;
 149
 150 /*
 151  * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
 152  * and hung_task_check_interval_secs
 153  */
 154 #ifdef CONFIG_DETECT_HUNG_TASK
 155 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 156 #endif
 157
 158 #ifdef CONFIG_INOTIFY_USER
 159 #include <linux/inotify.h>
 160 #endif
 161 #ifdef CONFIG_SPARC
 162 #endif
 163
 164 #ifdef __hppa__
 165 extern int pwrsw_enabled;
 166 #endif
 167
 168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 169 extern int unaligned_enabled;
 170 #endif
 171
 172 #ifdef CONFIG_IA64
 173 extern int unaligned_dump_stack;
 174 #endif
 175
 176 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 177 extern int no_unaligned_warning;
 178 #endif
 179
 180 #ifdef CONFIG_PROC_SYSCTL
 181
 182 /**
 183  * enum sysctl_writes_mode - supported sysctl write modes
 184  *
 185  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 186  *      to be written, and multiple writes on the same sysctl file descriptor
 187  *      will rewrite the sysctl value, regardless of file position. No warning
 188  *      is issued when the initial position is not 0.
 189  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 190  *      not 0.
 191  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 192  *      file position 0 and the value must be fully contained in the buffer
 193  *      sent to the write syscall. If dealing with strings respect the file
 194  *      position, but restrict this to the max length of the buffer, anything
 195  *      passed the max lenght will be ignored. Multiple writes will append
 196  *      to the buffer.
 197  *
 198  * These write modes control how current file position affects the behavior of
 199  * updating sysctl values through the proc interface on each write.
 200  */
 201 enum sysctl_writes_mode {
 202         SYSCTL_WRITES_LEGACY            = -1,
 203         SYSCTL_WRITES_WARN              = 0,
 204         SYSCTL_WRITES_STRICT            = 1,
 205 };
 206
 207 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 208
 209 static int proc_do_cad_pid(struct ctl_table *table, int write,
 210                   void __user *buffer, size_t *lenp, loff_t *ppos);
 211 static int proc_taint(struct ctl_table *table, int write,
 212                                void __user *buffer, size_t *lenp, loff_t *ppos);
 213 #endif
 214
 215 #ifdef CONFIG_PRINTK
 216 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 217                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 218 #endif
 219
 220 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 221                 void __user *buffer, size_t *lenp, loff_t *ppos);
 222 #ifdef CONFIG_COREDUMP
 223 static int proc_dostring_coredump(struct ctl_table *table, int write,
 224                 void __user *buffer, size_t *lenp, loff_t *ppos);
 225 #endif
 226 static int proc_dopipe_max_size(struct ctl_table *table, int write,
 227                 void __user *buffer, size_t *lenp, loff_t *ppos);
 228
 229 #ifdef CONFIG_MAGIC_SYSRQ
 230 /* Note: sysrq code uses its own private copy */
 231 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 232
 233 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 234                                 void __user *buffer, size_t *lenp,
 235                                 loff_t *ppos)
 236 {
 237         int error;
 238
 239         error = proc_dointvec(table, write, buffer, lenp, ppos);
 240         if (error)
 241                 return error;
 242
 243         if (write)
 244                 sysrq_toggle_support(__sysrq_enabled);
 245
 246         return 0;
 247 }
 248
 249 #endif
 250
 251 static struct ctl_table kern_table[];
 252 static struct ctl_table vm_table[];
 253 static struct ctl_table fs_table[];
 254 static struct ctl_table debug_table[];
 255 static struct ctl_table dev_table[];
 256 extern struct ctl_table random_table[];
 257 #ifdef CONFIG_EPOLL
 258 extern struct ctl_table epoll_table[];
 259 #endif
 260
 261 #ifdef CONFIG_FW_LOADER_USER_HELPER
 262 extern struct ctl_table firmware_config_table[];
 263 #endif
 264
 265 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 266 int sysctl_legacy_va_layout;
 267 #endif
 268
 269 /* The default sysctl tables: */
 270
 271 static struct ctl_table sysctl_base_table[] = {
 272         {
 273                 .procname       = "kernel",
 274                 .mode           = 0555,
 275                 .child          = kern_table,
 276         },
 277         {
 278                 .procname       = "vm",
 279                 .mode           = 0555,
 280                 .child          = vm_table,
 281         },
 282         {
 283                 .procname       = "fs",
 284                 .mode           = 0555,
 285                 .child          = fs_table,
 286         },
 287         {
 288                 .procname       = "debug",
 289                 .mode           = 0555,
 290                 .child          = debug_table,
 291         },
 292         {
 293                 .procname       = "dev",
 294                 .mode           = 0555,
 295                 .child          = dev_table,
 296         },
 297         { }
 298 };
 299
 300 #ifdef CONFIG_SCHED_DEBUG
 301 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 302 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 303 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 304 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 305 #ifdef CONFIG_SMP
 306 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 307 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 308 #endif /* CONFIG_SMP */
 309 #endif /* CONFIG_SCHED_DEBUG */
 310
 311 #ifdef CONFIG_COMPACTION
 312 static int min_extfrag_threshold;
 313 static int max_extfrag_threshold = 1000;
 314 #endif
 315
 316 static struct ctl_table kern_table[] = {
 317         {
 318                 .procname       = "sched_child_runs_first",
 319                 .data           = &sysctl_sched_child_runs_first,
 320                 .maxlen         = sizeof(unsigned int),
 321                 .mode           = 0644,
 322                 .proc_handler   = proc_dointvec,
 323         },
 324 #ifdef CONFIG_SCHED_DEBUG
 325         {
 326                 .procname       = "sched_min_granularity_ns",
 327                 .data           = &sysctl_sched_min_granularity,
 328                 .maxlen         = sizeof(unsigned int),
 329                 .mode           = 0644,
 330                 .proc_handler   = sched_proc_update_handler,
 331                 .extra1         = &min_sched_granularity_ns,
 332                 .extra2         = &max_sched_granularity_ns,
 333         },
 334         {
 335                 .procname       = "sched_latency_ns",
 336                 .data           = &sysctl_sched_latency,
 337                 .maxlen         = sizeof(unsigned int),
 338                 .mode           = 0644,
 339                 .proc_handler   = sched_proc_update_handler,
 340                 .extra1         = &min_sched_granularity_ns,
 341                 .extra2         = &max_sched_granularity_ns,
 342         },
 343         {
 344                 .procname       = "sched_wakeup_granularity_ns",
 345                 .data           = &sysctl_sched_wakeup_granularity,
 346                 .maxlen         = sizeof(unsigned int),
 347                 .mode           = 0644,
 348                 .proc_handler   = sched_proc_update_handler,
 349                 .extra1         = &min_wakeup_granularity_ns,
 350                 .extra2         = &max_wakeup_granularity_ns,
 351         },
 352 #ifdef CONFIG_SMP
 353         {
 354                 .procname       = "sched_tunable_scaling",
 355                 .data           = &sysctl_sched_tunable_scaling,
 356                 .maxlen         = sizeof(enum sched_tunable_scaling),
 357                 .mode           = 0644,
 358                 .proc_handler   = sched_proc_update_handler,
 359                 .extra1         = &min_sched_tunable_scaling,
 360                 .extra2         = &max_sched_tunable_scaling,
 361         },
 362         {
 363                 .procname       = "sched_migration_cost_ns",
 364                 .data           = &sysctl_sched_migration_cost,
 365                 .maxlen         = sizeof(unsigned int),
 366                 .mode           = 0644,
 367                 .proc_handler   = proc_dointvec,
 368         },
 369         {
 370                 .procname       = "sched_nr_migrate",
 371                 .data           = &sysctl_sched_nr_migrate,
 372                 .maxlen         = sizeof(unsigned int),
 373                 .mode           = 0644,
 374                 .proc_handler   = proc_dointvec,
 375         },
 376 #ifdef CONFIG_SCHEDSTATS
 377         {
 378                 .procname       = "sched_schedstats",
 379                 .data           = NULL,
 380                 .maxlen         = sizeof(unsigned int),
 381                 .mode           = 0644,
 382                 .proc_handler   = sysctl_schedstats,
 383                 .extra1         = &zero,
 384                 .extra2         = &one,
 385         },
 386 #endif /* CONFIG_SCHEDSTATS */
 387 #endif /* CONFIG_SMP */
 388 #ifdef CONFIG_NUMA_BALANCING
 389         {
 390                 .procname       = "numa_balancing_scan_delay_ms",
 391                 .data           = &sysctl_numa_balancing_scan_delay,
 392                 .maxlen         = sizeof(unsigned int),
 393                 .mode           = 0644,
 394                 .proc_handler   = proc_dointvec,
 395         },
 396         {
 397                 .procname       = "numa_balancing_scan_period_min_ms",
 398                 .data           = &sysctl_numa_balancing_scan_period_min,
 399                 .maxlen         = sizeof(unsigned int),
 400                 .mode           = 0644,
 401                 .proc_handler   = proc_dointvec,
 402         },
 403         {
 404                 .procname       = "numa_balancing_scan_period_max_ms",
 405                 .data           = &sysctl_numa_balancing_scan_period_max,
 406                 .maxlen         = sizeof(unsigned int),
 407                 .mode           = 0644,
 408                 .proc_handler   = proc_dointvec,
 409         },
 410         {
 411                 .procname       = "numa_balancing_scan_size_mb",
 412                 .data           = &sysctl_numa_balancing_scan_size,
 413                 .maxlen         = sizeof(unsigned int),
 414                 .mode           = 0644,
 415                 .proc_handler   = proc_dointvec_minmax,
 416                 .extra1         = &one,
 417         },
 418         {
 419                 .procname       = "numa_balancing",
 420                 .data           = NULL, /* filled in by handler */
 421                 .maxlen         = sizeof(unsigned int),
 422                 .mode           = 0644,
 423                 .proc_handler   = sysctl_numa_balancing,
 424                 .extra1         = &zero,
 425                 .extra2         = &one,
 426         },
 427 #endif /* CONFIG_NUMA_BALANCING */
 428 #endif /* CONFIG_SCHED_DEBUG */
 429         {
 430                 .procname       = "sched_rt_period_us",
 431                 .data           = &sysctl_sched_rt_period,
 432                 .maxlen         = sizeof(unsigned int),
 433                 .mode           = 0644,
 434                 .proc_handler   = sched_rt_handler,
 435         },
 436         {
 437                 .procname       = "sched_rt_runtime_us",
 438                 .data           = &sysctl_sched_rt_runtime,
 439                 .maxlen         = sizeof(int),
 440                 .mode           = 0644,
 441                 .proc_handler   = sched_rt_handler,
 442         },
 443         {
 444                 .procname       = "sched_rr_timeslice_ms",
 445                 .data           = &sysctl_sched_rr_timeslice,
 446                 .maxlen         = sizeof(int),
 447                 .mode           = 0644,
 448                 .proc_handler   = sched_rr_handler,
 449         },
 450 #ifdef CONFIG_SCHED_AUTOGROUP
 451         {
 452                 .procname       = "sched_autogroup_enabled",
 453                 .data           = &sysctl_sched_autogroup_enabled,
 454                 .maxlen         = sizeof(unsigned int),
 455                 .mode           = 0644,
 456                 .proc_handler   = proc_dointvec_minmax,
 457                 .extra1         = &zero,
 458                 .extra2         = &one,
 459         },
 460 #endif
 461 #ifdef CONFIG_CFS_BANDWIDTH
 462         {
 463                 .procname       = "sched_cfs_bandwidth_slice_us",
 464                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 465                 .maxlen         = sizeof(unsigned int),
 466                 .mode           = 0644,
 467                 .proc_handler   = proc_dointvec_minmax,
 468                 .extra1         = &one,
 469         },
 470 #endif
 471 #ifdef CONFIG_PROVE_LOCKING
 472         {
 473                 .procname       = "prove_locking",
 474                 .data           = &prove_locking,
 475                 .maxlen         = sizeof(int),
 476                 .mode           = 0644,
 477                 .proc_handler   = proc_dointvec,
 478         },
 479 #endif
 480 #ifdef CONFIG_LOCK_STAT
 481         {
 482                 .procname       = "lock_stat",
 483                 .data           = &lock_stat,
 484                 .maxlen         = sizeof(int),
 485                 .mode           = 0644,
 486                 .proc_handler   = proc_dointvec,
 487         },
 488 #endif
 489         {
 490                 .procname       = "panic",
 491                 .data           = &panic_timeout,
 492                 .maxlen         = sizeof(int),
 493                 .mode           = 0644,
 494                 .proc_handler   = proc_dointvec,
 495         },
 496 #ifdef CONFIG_COREDUMP
 497         {
 498                 .procname       = "core_uses_pid",
 499                 .data           = &core_uses_pid,
 500                 .maxlen         = sizeof(int),
 501                 .mode           = 0644,
 502                 .proc_handler   = proc_dointvec,
 503         },
 504         {
 505                 .procname       = "core_pattern",
 506                 .data           = core_pattern,
 507                 .maxlen         = CORENAME_MAX_SIZE,
 508                 .mode           = 0644,
 509                 .proc_handler   = proc_dostring_coredump,
 510         },
 511         {
 512                 .procname       = "core_pipe_limit",
 513                 .data           = &core_pipe_limit,
 514                 .maxlen         = sizeof(unsigned int),
 515                 .mode           = 0644,
 516                 .proc_handler   = proc_dointvec,
 517         },
 518 #endif
 519 #ifdef CONFIG_PROC_SYSCTL
 520         {
 521                 .procname       = "tainted",
 522                 .maxlen         = sizeof(long),
 523                 .mode           = 0644,
 524                 .proc_handler   = proc_taint,
 525         },
 526         {
 527                 .procname       = "sysctl_writes_strict",
 528                 .data           = &sysctl_writes_strict,
 529                 .maxlen         = sizeof(int),
 530                 .mode           = 0644,
 531                 .proc_handler   = proc_dointvec_minmax,
 532                 .extra1         = &neg_one,
 533                 .extra2         = &one,
 534         },
 535 #endif
 536 #ifdef CONFIG_LATENCYTOP
 537         {
 538                 .procname       = "latencytop",
 539                 .data           = &latencytop_enabled,
 540                 .maxlen         = sizeof(int),
 541                 .mode           = 0644,
 542                 .proc_handler   = sysctl_latencytop,
 543         },
 544 #endif
 545 #ifdef CONFIG_BLK_DEV_INITRD
 546         {
 547                 .procname       = "real-root-dev",
 548                 .data           = &real_root_dev,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = proc_dointvec,
 552         },
 553 #endif
 554         {
 555                 .procname       = "print-fatal-signals",
 556                 .data           = &print_fatal_signals,
 557                 .maxlen         = sizeof(int),
 558                 .mode           = 0644,
 559                 .proc_handler   = proc_dointvec,
 560         },
 561 #ifdef CONFIG_SPARC
 562         {
 563                 .procname       = "reboot-cmd",
 564                 .data           = reboot_command,
 565                 .maxlen         = 256,
 566                 .mode           = 0644,
 567                 .proc_handler   = proc_dostring,
 568         },
 569         {
 570                 .procname       = "stop-a",
 571                 .data           = &stop_a_enabled,
 572                 .maxlen         = sizeof (int),
 573                 .mode           = 0644,
 574                 .proc_handler   = proc_dointvec,
 575         },
 576         {
 577                 .procname       = "scons-poweroff",
 578                 .data           = &scons_pwroff,
 579                 .maxlen         = sizeof (int),
 580                 .mode           = 0644,
 581                 .proc_handler   = proc_dointvec,
 582         },
 583 #endif
 584 #ifdef CONFIG_SPARC64
 585         {
 586                 .procname       = "tsb-ratio",
 587                 .data           = &sysctl_tsb_ratio,
 588                 .maxlen         = sizeof (int),
 589                 .mode           = 0644,
 590                 .proc_handler   = proc_dointvec,
 591         },
 592 #endif
 593 #ifdef __hppa__
 594         {
 595                 .procname       = "soft-power",
 596                 .data           = &pwrsw_enabled,
 597                 .maxlen         = sizeof (int),
 598                 .mode           = 0644,
 599                 .proc_handler   = proc_dointvec,
 600         },
 601 #endif
 602 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 603         {
 604                 .procname       = "unaligned-trap",
 605                 .data           = &unaligned_enabled,
 606                 .maxlen         = sizeof (int),
 607                 .mode           = 0644,
 608                 .proc_handler   = proc_dointvec,
 609         },
 610 #endif
 611         {
 612                 .procname       = "ctrl-alt-del",
 613                 .data           = &C_A_D,
 614                 .maxlen         = sizeof(int),
 615                 .mode           = 0644,
 616                 .proc_handler   = proc_dointvec,
 617         },
 618 #ifdef CONFIG_FUNCTION_TRACER
 619         {
 620                 .procname       = "ftrace_enabled",
 621                 .data           = &ftrace_enabled,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = ftrace_enable_sysctl,
 625         },
 626 #endif
 627 #ifdef CONFIG_STACK_TRACER
 628         {
 629                 .procname       = "stack_tracer_enabled",
 630                 .data           = &stack_tracer_enabled,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = stack_trace_sysctl,
 634         },
 635 #endif
 636 #ifdef CONFIG_TRACING
 637         {
 638                 .procname       = "ftrace_dump_on_oops",
 639                 .data           = &ftrace_dump_on_oops,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = proc_dointvec,
 643         },
 644         {
 645                 .procname       = "traceoff_on_warning",
 646                 .data           = &__disable_trace_on_warning,
 647                 .maxlen         = sizeof(__disable_trace_on_warning),
 648                 .mode           = 0644,
 649                 .proc_handler   = proc_dointvec,
 650         },
 651         {
 652                 .procname       = "tracepoint_printk",
 653                 .data           = &tracepoint_printk,
 654                 .maxlen         = sizeof(tracepoint_printk),
 655                 .mode           = 0644,
 656                 .proc_handler   = tracepoint_printk_sysctl,
 657         },
 658 #endif
 659 #ifdef CONFIG_KEXEC_CORE
 660         {
 661                 .procname       = "kexec_load_disabled",
 662                 .data           = &kexec_load_disabled,
 663                 .maxlen         = sizeof(int),
 664                 .mode           = 0644,
 665                 /* only handle a transition from default "0" to "1" */
 666                 .proc_handler   = proc_dointvec_minmax,
 667                 .extra1         = &one,
 668                 .extra2         = &one,
 669         },
 670 #endif
 671 #ifdef CONFIG_MODULES
 672         {
 673                 .procname       = "modprobe",
 674                 .data           = &modprobe_path,
 675                 .maxlen         = KMOD_PATH_LEN,
 676                 .mode           = 0644,
 677                 .proc_handler   = proc_dostring,
 678         },
 679         {
 680                 .procname       = "modules_disabled",
 681                 .data           = &modules_disabled,
 682                 .maxlen         = sizeof(int),
 683                 .mode           = 0644,
 684                 /* only handle a transition from default "0" to "1" */
 685                 .proc_handler   = proc_dointvec_minmax,
 686                 .extra1         = &one,
 687                 .extra2         = &one,
 688         },
 689 #endif
 690 #ifdef CONFIG_UEVENT_HELPER
 691         {
 692                 .procname       = "hotplug",
 693                 .data           = &uevent_helper,
 694                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 695                 .mode           = 0644,
 696                 .proc_handler   = proc_dostring,
 697         },
 698 #endif
 699 #ifdef CONFIG_CHR_DEV_SG
 700         {
 701                 .procname       = "sg-big-buff",
 702                 .data           = &sg_big_buff,
 703                 .maxlen         = sizeof (int),
 704                 .mode           = 0444,
 705                 .proc_handler   = proc_dointvec,
 706         },
 707 #endif
 708 #ifdef CONFIG_BSD_PROCESS_ACCT
 709         {
 710                 .procname       = "acct",
 711                 .data           = &acct_parm,
 712                 .maxlen         = 3*sizeof(int),
 713                 .mode           = 0644,
 714                 .proc_handler   = proc_dointvec,
 715         },
 716 #endif
 717 #ifdef CONFIG_MAGIC_SYSRQ
 718         {
 719                 .procname       = "sysrq",
 720                 .data           = &__sysrq_enabled,
 721                 .maxlen         = sizeof (int),
 722                 .mode           = 0644,
 723                 .proc_handler   = sysrq_sysctl_handler,
 724         },
 725 #endif
 726 #ifdef CONFIG_PROC_SYSCTL
 727         {
 728                 .procname       = "cad_pid",
 729                 .data           = NULL,
 730                 .maxlen         = sizeof (int),
 731                 .mode           = 0600,
 732                 .proc_handler   = proc_do_cad_pid,
 733         },
 734 #endif
 735         {
 736                 .procname       = "threads-max",
 737                 .data           = NULL,
 738                 .maxlen         = sizeof(int),
 739                 .mode           = 0644,
 740                 .proc_handler   = sysctl_max_threads,
 741         },
 742         {
 743                 .procname       = "random",
 744                 .mode           = 0555,
 745                 .child          = random_table,
 746         },
 747         {
 748                 .procname       = "usermodehelper",
 749                 .mode           = 0555,
 750                 .child          = usermodehelper_table,
 751         },
 752 #ifdef CONFIG_FW_LOADER_USER_HELPER
 753         {
 754                 .procname       = "firmware_config",
 755                 .mode           = 0555,
 756                 .child          = firmware_config_table,
 757         },
 758 #endif
 759         {
 760                 .procname       = "overflowuid",
 761                 .data           = &overflowuid,
 762                 .maxlen         = sizeof(int),
 763                 .mode           = 0644,
 764                 .proc_handler   = proc_dointvec_minmax,
 765                 .extra1         = &minolduid,
 766                 .extra2         = &maxolduid,
 767         },
 768         {
 769                 .procname       = "overflowgid",
 770                 .data           = &overflowgid,
 771                 .maxlen         = sizeof(int),
 772                 .mode           = 0644,
 773                 .proc_handler   = proc_dointvec_minmax,
 774                 .extra1         = &minolduid,
 775                 .extra2         = &maxolduid,
 776         },
 777 #ifdef CONFIG_S390
 778 #ifdef CONFIG_MATHEMU
 779         {
 780                 .procname       = "ieee_emulation_warnings",
 781                 .data           = &sysctl_ieee_emulation_warnings,
 782                 .maxlen         = sizeof(int),
 783                 .mode           = 0644,
 784                 .proc_handler   = proc_dointvec,
 785         },
 786 #endif
 787         {
 788                 .procname       = "userprocess_debug",
 789                 .data           = &show_unhandled_signals,
 790                 .maxlen         = sizeof(int),
 791                 .mode           = 0644,
 792                 .proc_handler   = proc_dointvec,
 793         },
 794 #endif
 795         {
 796                 .procname       = "pid_max",
 797                 .data           = &pid_max,
 798                 .maxlen         = sizeof (int),
 799                 .mode           = 0644,
 800                 .proc_handler   = proc_dointvec_minmax,
 801                 .extra1         = &pid_max_min,
 802                 .extra2         = &pid_max_max,
 803         },
 804         {
 805                 .procname       = "panic_on_oops",
 806                 .data           = &panic_on_oops,
 807                 .maxlen         = sizeof(int),
 808                 .mode           = 0644,
 809                 .proc_handler   = proc_dointvec,
 810         },
 811 #if defined CONFIG_PRINTK
 812         {
 813                 .procname       = "printk",
 814                 .data           = &console_loglevel,
 815                 .maxlen         = 4*sizeof(int),
 816                 .mode           = 0644,
 817                 .proc_handler   = proc_dointvec,
 818         },
 819         {
 820                 .procname       = "printk_ratelimit",
 821                 .data           = &printk_ratelimit_state.interval,
 822                 .maxlen         = sizeof(int),
 823                 .mode           = 0644,
 824                 .proc_handler   = proc_dointvec_jiffies,
 825         },
 826         {
 827                 .procname       = "printk_ratelimit_burst",
 828                 .data           = &printk_ratelimit_state.burst,
 829                 .maxlen         = sizeof(int),
 830                 .mode           = 0644,
 831                 .proc_handler   = proc_dointvec,
 832         },
 833         {
 834                 .procname       = "printk_delay",
 835                 .data           = &printk_delay_msec,
 836                 .maxlen         = sizeof(int),
 837                 .mode           = 0644,
 838                 .proc_handler   = proc_dointvec_minmax,
 839                 .extra1         = &zero,
 840                 .extra2         = &ten_thousand,
 841         },
 842         {
 843                 .procname       = "printk_devkmsg",
 844                 .data           = devkmsg_log_str,
 845                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
 846                 .mode           = 0644,
 847                 .proc_handler   = devkmsg_sysctl_set_loglvl,
 848         },
 849         {
 850                 .procname       = "dmesg_restrict",
 851                 .data           = &dmesg_restrict,
 852                 .maxlen         = sizeof(int),
 853                 .mode           = 0644,
 854                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 855                 .extra1         = &zero,
 856                 .extra2         = &one,
 857         },
 858         {
 859                 .procname       = "kptr_restrict",
 860                 .data           = &kptr_restrict,
 861                 .maxlen         = sizeof(int),
 862                 .mode           = 0644,
 863                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 864                 .extra1         = &zero,
 865                 .extra2         = &two,
 866         },
 867 #endif
 868         {
 869                 .procname       = "ngroups_max",
 870                 .data           = &ngroups_max,
 871                 .maxlen         = sizeof (int),
 872                 .mode           = 0444,
 873                 .proc_handler   = proc_dointvec,
 874         },
 875         {
 876                 .procname       = "cap_last_cap",
 877                 .data           = (void *)&cap_last_cap,
 878                 .maxlen         = sizeof(int),
 879                 .mode           = 0444,
 880                 .proc_handler   = proc_dointvec,
 881         },
 882 #if defined(CONFIG_LOCKUP_DETECTOR)
 883         {
 884                 .procname       = "watchdog",
 885                 .data           = &watchdog_user_enabled,
 886                 .maxlen         = sizeof(int),
 887                 .mode           = 0644,
 888                 .proc_handler   = proc_watchdog,
 889                 .extra1         = &zero,
 890                 .extra2         = &one,
 891         },
 892         {
 893                 .procname       = "watchdog_thresh",
 894                 .data           = &watchdog_thresh,
 895                 .maxlen         = sizeof(int),
 896                 .mode           = 0644,
 897                 .proc_handler   = proc_watchdog_thresh,
 898                 .extra1         = &zero,
 899                 .extra2         = &sixty,
 900         },
 901         {
 902                 .procname       = "nmi_watchdog",
 903                 .data           = &nmi_watchdog_user_enabled,
 904                 .maxlen         = sizeof(int),
 905                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
 906                 .proc_handler   = proc_nmi_watchdog,
 907                 .extra1         = &zero,
 908                 .extra2         = &one,
 909         },
 910         {
 911                 .procname       = "watchdog_cpumask",
 912                 .data           = &watchdog_cpumask_bits,
 913                 .maxlen         = NR_CPUS,
 914                 .mode           = 0644,
 915                 .proc_handler   = proc_watchdog_cpumask,
 916         },
 917 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
 918         {
 919                 .procname       = "soft_watchdog",
 920                 .data           = &soft_watchdog_user_enabled,
 921                 .maxlen         = sizeof(int),
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_soft_watchdog,
 924                 .extra1         = &zero,
 925                 .extra2         = &one,
 926         },
 927         {
 928                 .procname       = "softlockup_panic",
 929                 .data           = &softlockup_panic,
 930                 .maxlen         = sizeof(int),
 931                 .mode           = 0644,
 932                 .proc_handler   = proc_dointvec_minmax,
 933                 .extra1         = &zero,
 934                 .extra2         = &one,
 935         },
 936 #ifdef CONFIG_SMP
 937         {
 938                 .procname       = "softlockup_all_cpu_backtrace",
 939                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 940                 .maxlen         = sizeof(int),
 941                 .mode           = 0644,
 942                 .proc_handler   = proc_dointvec_minmax,
 943                 .extra1         = &zero,
 944                 .extra2         = &one,
 945         },
 946 #endif /* CONFIG_SMP */
 947 #endif
 948 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 949         {
 950                 .procname       = "hardlockup_panic",
 951                 .data           = &hardlockup_panic,
 952                 .maxlen         = sizeof(int),
 953                 .mode           = 0644,
 954                 .proc_handler   = proc_dointvec_minmax,
 955                 .extra1         = &zero,
 956                 .extra2         = &one,
 957         },
 958 #ifdef CONFIG_SMP
 959         {
 960                 .procname       = "hardlockup_all_cpu_backtrace",
 961                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
 962                 .maxlen         = sizeof(int),
 963                 .mode           = 0644,
 964                 .proc_handler   = proc_dointvec_minmax,
 965                 .extra1         = &zero,
 966                 .extra2         = &one,
 967         },
 968 #endif /* CONFIG_SMP */
 969 #endif
 970 #endif
 971
 972 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 973         {
 974                 .procname       = "unknown_nmi_panic",
 975                 .data           = &unknown_nmi_panic,
 976                 .maxlen         = sizeof (int),
 977                 .mode           = 0644,
 978                 .proc_handler   = proc_dointvec,
 979         },
 980 #endif
 981 #if defined(CONFIG_X86)
 982         {
 983                 .procname       = "panic_on_unrecovered_nmi",
 984                 .data           = &panic_on_unrecovered_nmi,
 985                 .maxlen         = sizeof(int),
 986                 .mode           = 0644,
 987                 .proc_handler   = proc_dointvec,
 988         },
 989         {
 990                 .procname       = "panic_on_io_nmi",
 991                 .data           = &panic_on_io_nmi,
 992                 .maxlen         = sizeof(int),
 993                 .mode           = 0644,
 994                 .proc_handler   = proc_dointvec,
 995         },
 996 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 997         {
 998                 .procname       = "panic_on_stackoverflow",
 999                 .data           = &sysctl_panic_on_stackoverflow,
1000                 .maxlen         = sizeof(int),
1001                 .mode           = 0644,
1002                 .proc_handler   = proc_dointvec,
1003         },
1004 #endif
1005         {
1006                 .procname       = "bootloader_type",
1007                 .data           = &bootloader_type,
1008                 .maxlen         = sizeof (int),
1009                 .mode           = 0444,
1010                 .proc_handler   = proc_dointvec,
1011         },
1012         {
1013                 .procname       = "bootloader_version",
1014                 .data           = &bootloader_version,
1015                 .maxlen         = sizeof (int),
1016                 .mode           = 0444,
1017                 .proc_handler   = proc_dointvec,
1018         },
1019         {
1020                 .procname       = "io_delay_type",
1021                 .data           = &io_delay_type,
1022                 .maxlen         = sizeof(int),
1023                 .mode           = 0644,
1024                 .proc_handler   = proc_dointvec,
1025         },
1026 #endif
1027 #if defined(CONFIG_MMU)
1028         {
1029                 .procname       = "randomize_va_space",
1030                 .data           = &randomize_va_space,
1031                 .maxlen         = sizeof(int),
1032                 .mode           = 0644,
1033                 .proc_handler   = proc_dointvec,
1034         },
1035 #endif
1036 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1037         {
1038                 .procname       = "spin_retry",
1039                 .data           = &spin_retry,
1040                 .maxlen         = sizeof (int),
1041                 .mode           = 0644,
1042                 .proc_handler   = proc_dointvec,
1043         },
1044 #endif
1045 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1046         {
1047                 .procname       = "acpi_video_flags",
1048                 .data           = &acpi_realmode_flags,
1049                 .maxlen         = sizeof (unsigned long),
1050                 .mode           = 0644,
1051                 .proc_handler   = proc_doulongvec_minmax,
1052         },
1053 #endif
1054 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1055         {
1056                 .procname       = "ignore-unaligned-usertrap",
1057                 .data           = &no_unaligned_warning,
1058                 .maxlen         = sizeof (int),
1059                 .mode           = 0644,
1060                 .proc_handler   = proc_dointvec,
1061         },
1062 #endif
1063 #ifdef CONFIG_IA64
1064         {
1065                 .procname       = "unaligned-dump-stack",
1066                 .data           = &unaligned_dump_stack,
1067                 .maxlen         = sizeof (int),
1068                 .mode           = 0644,
1069                 .proc_handler   = proc_dointvec,
1070         },
1071 #endif
1072 #ifdef CONFIG_DETECT_HUNG_TASK
1073         {
1074                 .procname       = "hung_task_panic",
1075                 .data           = &sysctl_hung_task_panic,
1076                 .maxlen         = sizeof(int),
1077                 .mode           = 0644,
1078                 .proc_handler   = proc_dointvec_minmax,
1079                 .extra1         = &zero,
1080                 .extra2         = &one,
1081         },
1082         {
1083                 .procname       = "hung_task_check_count",
1084                 .data           = &sysctl_hung_task_check_count,
1085                 .maxlen         = sizeof(int),
1086                 .mode           = 0644,
1087                 .proc_handler   = proc_dointvec_minmax,
1088                 .extra1         = &zero,
1089         },
1090         {
1091                 .procname       = "hung_task_timeout_secs",
1092                 .data           = &sysctl_hung_task_timeout_secs,
1093                 .maxlen         = sizeof(unsigned long),
1094                 .mode           = 0644,
1095                 .proc_handler   = proc_dohung_task_timeout_secs,
1096                 .extra2         = &hung_task_timeout_max,
1097         },
1098         {
1099                 .procname       = "hung_task_check_interval_secs",
1100                 .data           = &sysctl_hung_task_check_interval_secs,
1101                 .maxlen         = sizeof(unsigned long),
1102                 .mode           = 0644,
1103                 .proc_handler   = proc_dohung_task_timeout_secs,
1104                 .extra2         = &hung_task_timeout_max,
1105         },
1106         {
1107                 .procname       = "hung_task_warnings",
1108                 .data           = &sysctl_hung_task_warnings,
1109                 .maxlen         = sizeof(int),
1110                 .mode           = 0644,
1111                 .proc_handler   = proc_dointvec_minmax,
1112                 .extra1         = &neg_one,
1113         },
1114 #endif
1115 #ifdef CONFIG_RT_MUTEXES
1116         {
1117                 .procname       = "max_lock_depth",
1118                 .data           = &max_lock_depth,
1119                 .maxlen         = sizeof(int),
1120                 .mode           = 0644,
1121                 .proc_handler   = proc_dointvec,
1122         },
1123 #endif
1124         {
1125                 .procname       = "poweroff_cmd",
1126                 .data           = &poweroff_cmd,
1127                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1128                 .mode           = 0644,
1129                 .proc_handler   = proc_dostring,
1130         },
1131 #ifdef CONFIG_KEYS
1132         {
1133                 .procname       = "keys",
1134                 .mode           = 0555,
1135                 .child          = key_sysctls,
1136         },
1137 #endif
1138 #ifdef CONFIG_PERF_EVENTS
1139         /*
1140          * User-space scripts rely on the existence of this file
1141          * as a feature check for perf_events being enabled.
1142          *
1143          * So it's an ABI, do not remove!
1144          */
1145         {
1146                 .procname       = "perf_event_paranoid",
1147                 .data           = &sysctl_perf_event_paranoid,
1148                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1149                 .mode           = 0644,
1150                 .proc_handler   = proc_dointvec,
1151         },
1152         {
1153                 .procname       = "perf_event_mlock_kb",
1154                 .data           = &sysctl_perf_event_mlock,
1155                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1156                 .mode           = 0644,
1157                 .proc_handler   = proc_dointvec,
1158         },
1159         {
1160                 .procname       = "perf_event_max_sample_rate",
1161                 .data           = &sysctl_perf_event_sample_rate,
1162                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1163                 .mode           = 0644,
1164                 .proc_handler   = perf_proc_update_handler,
1165                 .extra1         = &one,
1166         },
1167         {
1168                 .procname       = "perf_cpu_time_max_percent",
1169                 .data           = &sysctl_perf_cpu_time_max_percent,
1170                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1171                 .mode           = 0644,
1172                 .proc_handler   = perf_cpu_time_max_percent_handler,
1173                 .extra1         = &zero,
1174                 .extra2         = &one_hundred,
1175         },
1176         {
1177                 .procname       = "perf_event_max_stack",
1178                 .data           = &sysctl_perf_event_max_stack,
1179                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
1180                 .mode           = 0644,
1181                 .proc_handler   = perf_event_max_stack_handler,
1182                 .extra1         = &zero,
1183                 .extra2         = &six_hundred_forty_kb,
1184         },
1185         {
1186                 .procname       = "perf_event_max_contexts_per_stack",
1187                 .data           = &sysctl_perf_event_max_contexts_per_stack,
1188                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
1189                 .mode           = 0644,
1190                 .proc_handler   = perf_event_max_stack_handler,
1191                 .extra1         = &zero,
1192                 .extra2         = &one_thousand,
1193         },
1194 #endif
1195         {
1196                 .procname       = "panic_on_warn",
1197                 .data           = &panic_on_warn,
1198                 .maxlen         = sizeof(int),
1199                 .mode           = 0644,
1200                 .proc_handler   = proc_dointvec_minmax,
1201                 .extra1         = &zero,
1202                 .extra2         = &one,
1203         },
1204 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1205         {
1206                 .procname       = "timer_migration",
1207                 .data           = &sysctl_timer_migration,
1208                 .maxlen         = sizeof(unsigned int),
1209                 .mode           = 0644,
1210                 .proc_handler   = timer_migration_handler,
1211                 .extra1         = &zero,
1212                 .extra2         = &one,
1213         },
1214 #endif
1215 #ifdef CONFIG_BPF_SYSCALL
1216         {
1217                 .procname       = "unprivileged_bpf_disabled",
1218                 .data           = &sysctl_unprivileged_bpf_disabled,
1219                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
1220                 .mode           = 0644,
1221                 /* only handle a transition from default "0" to "1" */
1222                 .proc_handler   = proc_dointvec_minmax,
1223                 .extra1         = &one,
1224                 .extra2         = &one,
1225         },
1226 #endif
1227 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1228         {
1229                 .procname       = "panic_on_rcu_stall",
1230                 .data           = &sysctl_panic_on_rcu_stall,
1231                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
1232                 .mode           = 0644,
1233                 .proc_handler   = proc_dointvec_minmax,
1234                 .extra1         = &zero,
1235                 .extra2         = &one,
1236         },
1237 #endif
1238         { }
1239 };
1240
1241 static struct ctl_table vm_table[] = {
1242         {
1243                 .procname       = "overcommit_memory",
1244                 .data           = &sysctl_overcommit_memory,
1245                 .maxlen         = sizeof(sysctl_overcommit_memory),
1246                 .mode           = 0644,
1247                 .proc_handler   = proc_dointvec_minmax,
1248                 .extra1         = &zero,
1249                 .extra2         = &two,
1250         },
1251         {
1252                 .procname       = "panic_on_oom",
1253                 .data           = &sysctl_panic_on_oom,
1254                 .maxlen         = sizeof(sysctl_panic_on_oom),
1255                 .mode           = 0644,
1256                 .proc_handler   = proc_dointvec_minmax,
1257                 .extra1         = &zero,
1258                 .extra2         = &two,
1259         },
1260         {
1261                 .procname       = "oom_kill_allocating_task",
1262                 .data           = &sysctl_oom_kill_allocating_task,
1263                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1264                 .mode           = 0644,
1265                 .proc_handler   = proc_dointvec,
1266         },
1267         {
1268                 .procname       = "oom_dump_tasks",
1269                 .data           = &sysctl_oom_dump_tasks,
1270                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1271                 .mode           = 0644,
1272                 .proc_handler   = proc_dointvec,
1273         },
1274         {
1275                 .procname       = "overcommit_ratio",
1276                 .data           = &sysctl_overcommit_ratio,
1277                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1278                 .mode           = 0644,
1279                 .proc_handler   = overcommit_ratio_handler,
1280         },
1281         {
1282                 .procname       = "overcommit_kbytes",
1283                 .data           = &sysctl_overcommit_kbytes,
1284                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1285                 .mode           = 0644,
1286                 .proc_handler   = overcommit_kbytes_handler,
1287         },
1288         {
1289                 .procname       = "page-cluster",
1290                 .data           = &page_cluster,
1291                 .maxlen         = sizeof(int),
1292                 .mode           = 0644,
1293                 .proc_handler   = proc_dointvec_minmax,
1294                 .extra1         = &zero,
1295         },
1296         {
1297                 .procname       = "dirty_background_ratio",
1298                 .data           = &dirty_background_ratio,
1299                 .maxlen         = sizeof(dirty_background_ratio),
1300                 .mode           = 0644,
1301                 .proc_handler   = dirty_background_ratio_handler,
1302                 .extra1         = &zero,
1303                 .extra2         = &one_hundred,
1304         },
1305         {
1306                 .procname       = "dirty_background_bytes",
1307                 .data           = &dirty_background_bytes,
1308                 .maxlen         = sizeof(dirty_background_bytes),
1309                 .mode           = 0644,
1310                 .proc_handler   = dirty_background_bytes_handler,
1311                 .extra1         = &one_ul,
1312         },
1313         {
1314                 .procname       = "dirty_ratio",
1315                 .data           = &vm_dirty_ratio,
1316                 .maxlen         = sizeof(vm_dirty_ratio),
1317                 .mode           = 0644,
1318                 .proc_handler   = dirty_ratio_handler,
1319                 .extra1         = &zero,
1320                 .extra2         = &one_hundred,
1321         },
1322         {
1323                 .procname       = "dirty_bytes",
1324                 .data           = &vm_dirty_bytes,
1325                 .maxlen         = sizeof(vm_dirty_bytes),
1326                 .mode           = 0644,
1327                 .proc_handler   = dirty_bytes_handler,
1328                 .extra1         = &dirty_bytes_min,
1329         },
1330         {
1331                 .procname       = "dirty_writeback_centisecs",
1332                 .data           = &dirty_writeback_interval,
1333                 .maxlen         = sizeof(dirty_writeback_interval),
1334                 .mode           = 0644,
1335                 .proc_handler   = dirty_writeback_centisecs_handler,
1336         },
1337         {
1338                 .procname       = "dirty_expire_centisecs",
1339                 .data           = &dirty_expire_interval,
1340                 .maxlen         = sizeof(dirty_expire_interval),
1341                 .mode           = 0644,
1342                 .proc_handler   = proc_dointvec_minmax,
1343                 .extra1         = &zero,
1344         },
1345         {
1346                 .procname       = "dirtytime_expire_seconds",
1347                 .data           = &dirtytime_expire_interval,
1348                 .maxlen         = sizeof(dirtytime_expire_interval),
1349                 .mode           = 0644,
1350                 .proc_handler   = dirtytime_interval_handler,
1351                 .extra1         = &zero,
1352         },
1353         {
1354                 .procname       = "swappiness",
1355                 .data           = &vm_swappiness,
1356                 .maxlen         = sizeof(vm_swappiness),
1357                 .mode           = 0644,
1358                 .proc_handler   = proc_dointvec_minmax,
1359                 .extra1         = &zero,
1360                 .extra2         = &one_hundred,
1361         },
1362 #ifdef CONFIG_HUGETLB_PAGE
1363         {
1364                 .procname       = "nr_hugepages",
1365                 .data           = NULL,
1366                 .maxlen         = sizeof(unsigned long),
1367                 .mode           = 0644,
1368                 .proc_handler   = hugetlb_sysctl_handler,
1369         },
1370 #ifdef CONFIG_NUMA
1371         {
1372                 .procname       = "nr_hugepages_mempolicy",
1373                 .data           = NULL,
1374                 .maxlen         = sizeof(unsigned long),
1375                 .mode           = 0644,
1376                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1377         },
1378         {
1379                 .procname               = "numa_stat",
1380                 .data                   = &sysctl_vm_numa_stat,
1381                 .maxlen                 = sizeof(int),
1382                 .mode                   = 0644,
1383                 .proc_handler   = sysctl_vm_numa_stat_handler,
1384                 .extra1                 = &zero,
1385                 .extra2                 = &one,
1386         },
1387 #endif
1388          {
1389                 .procname       = "hugetlb_shm_group",
1390                 .data           = &sysctl_hugetlb_shm_group,
1391                 .maxlen         = sizeof(gid_t),
1392                 .mode           = 0644,
1393                 .proc_handler   = proc_dointvec,
1394          },
1395         {
1396                 .procname       = "nr_overcommit_hugepages",
1397                 .data           = NULL,
1398                 .maxlen         = sizeof(unsigned long),
1399                 .mode           = 0644,
1400                 .proc_handler   = hugetlb_overcommit_handler,
1401         },
1402 #endif
1403         {
1404                 .procname       = "lowmem_reserve_ratio",
1405                 .data           = &sysctl_lowmem_reserve_ratio,
1406                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1407                 .mode           = 0644,
1408                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1409         },
1410         {
1411                 .procname       = "drop_caches",
1412                 .data           = &sysctl_drop_caches,
1413                 .maxlen         = sizeof(int),
1414                 .mode           = 0644,
1415                 .proc_handler   = drop_caches_sysctl_handler,
1416                 .extra1         = &one,
1417                 .extra2         = &four,
1418         },
1419 #ifdef CONFIG_COMPACTION
1420         {
1421                 .procname       = "compact_memory",
1422                 .data           = &sysctl_compact_memory,
1423                 .maxlen         = sizeof(int),
1424                 .mode           = 0200,
1425                 .proc_handler   = sysctl_compaction_handler,
1426         },
1427         {
1428                 .procname       = "extfrag_threshold",
1429                 .data           = &sysctl_extfrag_threshold,
1430                 .maxlen         = sizeof(int),
1431                 .mode           = 0644,
1432                 .proc_handler   = sysctl_extfrag_handler,
1433                 .extra1         = &min_extfrag_threshold,
1434                 .extra2         = &max_extfrag_threshold,
1435         },
1436         {
1437                 .procname       = "compact_unevictable_allowed",
1438                 .data           = &sysctl_compact_unevictable_allowed,
1439                 .maxlen         = sizeof(int),
1440                 .mode           = 0644,
1441                 .proc_handler   = proc_dointvec,
1442                 .extra1         = &zero,
1443                 .extra2         = &one,
1444         },
1445
1446 #endif /* CONFIG_COMPACTION */
1447         {
1448                 .procname       = "min_free_kbytes",
1449                 .data           = &min_free_kbytes,
1450                 .maxlen         = sizeof(min_free_kbytes),
1451                 .mode           = 0644,
1452                 .proc_handler   = min_free_kbytes_sysctl_handler,
1453                 .extra1         = &zero,
1454         },
1455         {
1456                 .procname       = "watermark_scale_factor",
1457                 .data           = &watermark_scale_factor,
1458                 .maxlen         = sizeof(watermark_scale_factor),
1459                 .mode           = 0644,
1460                 .proc_handler   = watermark_scale_factor_sysctl_handler,
1461                 .extra1         = &one,
1462                 .extra2         = &one_thousand,
1463         },
1464         {
1465                 .procname       = "percpu_pagelist_fraction",
1466                 .data           = &percpu_pagelist_fraction,
1467                 .maxlen         = sizeof(percpu_pagelist_fraction),
1468                 .mode           = 0644,
1469                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1470                 .extra1         = &zero,
1471         },
1472 #ifdef CONFIG_MMU
1473         {
1474                 .procname       = "max_map_count",
1475                 .data           = &sysctl_max_map_count,
1476                 .maxlen         = sizeof(sysctl_max_map_count),
1477                 .mode           = 0644,
1478                 .proc_handler   = proc_dointvec_minmax,
1479                 .extra1         = &zero,
1480         },
1481 #else
1482         {
1483                 .procname       = "nr_trim_pages",
1484                 .data           = &sysctl_nr_trim_pages,
1485                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1486                 .mode           = 0644,
1487                 .proc_handler   = proc_dointvec_minmax,
1488                 .extra1         = &zero,
1489         },
1490 #endif
1491         {
1492                 .procname       = "laptop_mode",
1493                 .data           = &laptop_mode,
1494                 .maxlen         = sizeof(laptop_mode),
1495                 .mode           = 0644,
1496                 .proc_handler   = proc_dointvec_jiffies,
1497         },
1498         {
1499                 .procname       = "block_dump",
1500                 .data           = &block_dump,
1501                 .maxlen         = sizeof(block_dump),
1502                 .mode           = 0644,
1503                 .proc_handler   = proc_dointvec,
1504                 .extra1         = &zero,
1505         },
1506         {
1507                 .procname       = "vfs_cache_pressure",
1508                 .data           = &sysctl_vfs_cache_pressure,
1509                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1510                 .mode           = 0644,
1511                 .proc_handler   = proc_dointvec,
1512                 .extra1         = &zero,
1513         },
1514 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1515         {
1516                 .procname       = "legacy_va_layout",
1517                 .data           = &sysctl_legacy_va_layout,
1518                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1519                 .mode           = 0644,
1520                 .proc_handler   = proc_dointvec,
1521                 .extra1         = &zero,
1522         },
1523 #endif
1524 #ifdef CONFIG_NUMA
1525         {
1526                 .procname       = "zone_reclaim_mode",
1527                 .data           = &node_reclaim_mode,
1528                 .maxlen         = sizeof(node_reclaim_mode),
1529                 .mode           = 0644,
1530                 .proc_handler   = proc_dointvec,
1531                 .extra1         = &zero,
1532         },
1533         {
1534                 .procname       = "min_unmapped_ratio",
1535                 .data           = &sysctl_min_unmapped_ratio,
1536                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1537                 .mode           = 0644,
1538                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1539                 .extra1         = &zero,
1540                 .extra2         = &one_hundred,
1541         },
1542         {
1543                 .procname       = "min_slab_ratio",
1544                 .data           = &sysctl_min_slab_ratio,
1545                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1546                 .mode           = 0644,
1547                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1548                 .extra1         = &zero,
1549                 .extra2         = &one_hundred,
1550         },
1551 #endif
1552 #ifdef CONFIG_SMP
1553         {
1554                 .procname       = "stat_interval",
1555                 .data           = &sysctl_stat_interval,
1556                 .maxlen         = sizeof(sysctl_stat_interval),
1557                 .mode           = 0644,
1558                 .proc_handler   = proc_dointvec_jiffies,
1559         },
1560         {
1561                 .procname       = "stat_refresh",
1562                 .data           = NULL,
1563                 .maxlen         = 0,
1564                 .mode           = 0600,
1565                 .proc_handler   = vmstat_refresh,
1566         },
1567 #endif
1568 #ifdef CONFIG_MMU
1569         {
1570                 .procname       = "mmap_min_addr",
1571                 .data           = &dac_mmap_min_addr,
1572                 .maxlen         = sizeof(unsigned long),
1573                 .mode           = 0644,
1574                 .proc_handler   = mmap_min_addr_handler,
1575         },
1576 #endif
1577 #ifdef CONFIG_NUMA
1578         {
1579                 .procname       = "numa_zonelist_order",
1580                 .data           = &numa_zonelist_order,
1581                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1582                 .mode           = 0644,
1583                 .proc_handler   = numa_zonelist_order_handler,
1584         },
1585 #endif
1586 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1587    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1588         {
1589                 .procname       = "vdso_enabled",
1590 #ifdef CONFIG_X86_32
1591                 .data           = &vdso32_enabled,
1592                 .maxlen         = sizeof(vdso32_enabled),
1593 #else
1594                 .data           = &vdso_enabled,
1595                 .maxlen         = sizeof(vdso_enabled),
1596 #endif
1597                 .mode           = 0644,
1598                 .proc_handler   = proc_dointvec,
1599                 .extra1         = &zero,
1600         },
1601 #endif
1602 #ifdef CONFIG_HIGHMEM
1603         {
1604                 .procname       = "highmem_is_dirtyable",
1605                 .data           = &vm_highmem_is_dirtyable,
1606                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1607                 .mode           = 0644,
1608                 .proc_handler   = proc_dointvec_minmax,
1609                 .extra1         = &zero,
1610                 .extra2         = &one,
1611         },
1612 #endif
1613 #ifdef CONFIG_MEMORY_FAILURE
1614         {
1615                 .procname       = "memory_failure_early_kill",
1616                 .data           = &sysctl_memory_failure_early_kill,
1617                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1618                 .mode           = 0644,
1619                 .proc_handler   = proc_dointvec_minmax,
1620                 .extra1         = &zero,
1621                 .extra2         = &one,
1622         },
1623         {
1624                 .procname       = "memory_failure_recovery",
1625                 .data           = &sysctl_memory_failure_recovery,
1626                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1627                 .mode           = 0644,
1628                 .proc_handler   = proc_dointvec_minmax,
1629                 .extra1         = &zero,
1630                 .extra2         = &one,
1631         },
1632 #endif
1633         {
1634                 .procname       = "user_reserve_kbytes",
1635                 .data           = &sysctl_user_reserve_kbytes,
1636                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1637                 .mode           = 0644,
1638                 .proc_handler   = proc_doulongvec_minmax,
1639         },
1640         {
1641                 .procname       = "admin_reserve_kbytes",
1642                 .data           = &sysctl_admin_reserve_kbytes,
1643                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1644                 .mode           = 0644,
1645                 .proc_handler   = proc_doulongvec_minmax,
1646         },
1647 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1648         {
1649                 .procname       = "mmap_rnd_bits",
1650                 .data           = &mmap_rnd_bits,
1651                 .maxlen         = sizeof(mmap_rnd_bits),
1652                 .mode           = 0600,
1653                 .proc_handler   = proc_dointvec_minmax,
1654                 .extra1         = (void *)&mmap_rnd_bits_min,
1655                 .extra2         = (void *)&mmap_rnd_bits_max,
1656         },
1657 #endif
1658 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1659         {
1660                 .procname       = "mmap_rnd_compat_bits",
1661                 .data           = &mmap_rnd_compat_bits,
1662                 .maxlen         = sizeof(mmap_rnd_compat_bits),
1663                 .mode           = 0600,
1664                 .proc_handler   = proc_dointvec_minmax,
1665                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
1666                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
1667         },
1668 #endif
1669         { }
1670 };
1671
1672 static struct ctl_table fs_table[] = {
1673         {
1674                 .procname       = "inode-nr",
1675                 .data           = &inodes_stat,
1676                 .maxlen         = 2*sizeof(long),
1677                 .mode           = 0444,
1678                 .proc_handler   = proc_nr_inodes,
1679         },
1680         {
1681                 .procname       = "inode-state",
1682                 .data           = &inodes_stat,
1683                 .maxlen         = 7*sizeof(long),
1684                 .mode           = 0444,
1685                 .proc_handler   = proc_nr_inodes,
1686         },
1687         {
1688                 .procname       = "file-nr",
1689                 .data           = &files_stat,
1690                 .maxlen         = sizeof(files_stat),
1691                 .mode           = 0444,
1692                 .proc_handler   = proc_nr_files,
1693         },
1694         {
1695                 .procname       = "file-max",
1696                 .data           = &files_stat.max_files,
1697                 .maxlen         = sizeof(files_stat.max_files),
1698                 .mode           = 0644,
1699                 .proc_handler   = proc_doulongvec_minmax,
1700                 .extra1         = &zero_ul,
1701                 .extra2         = &long_max,
1702         },
1703         {
1704                 .procname       = "nr_open",
1705                 .data           = &sysctl_nr_open,
1706                 .maxlen         = sizeof(unsigned int),
1707                 .mode           = 0644,
1708                 .proc_handler   = proc_dointvec_minmax,
1709                 .extra1         = &sysctl_nr_open_min,
1710                 .extra2         = &sysctl_nr_open_max,
1711         },
1712         {
1713                 .procname       = "dentry-state",
1714                 .data           = &dentry_stat,
1715                 .maxlen         = 6*sizeof(long),
1716                 .mode           = 0444,
1717                 .proc_handler   = proc_nr_dentry,
1718         },
1719         {
1720                 .procname       = "overflowuid",
1721                 .data           = &fs_overflowuid,
1722                 .maxlen         = sizeof(int),
1723                 .mode           = 0644,
1724                 .proc_handler   = proc_dointvec_minmax,
1725                 .extra1         = &minolduid,
1726                 .extra2         = &maxolduid,
1727         },
1728         {
1729                 .procname       = "overflowgid",
1730                 .data           = &fs_overflowgid,
1731                 .maxlen         = sizeof(int),
1732                 .mode           = 0644,
1733                 .proc_handler   = proc_dointvec_minmax,
1734                 .extra1         = &minolduid,
1735                 .extra2         = &maxolduid,
1736         },
1737 #ifdef CONFIG_FILE_LOCKING
1738         {
1739                 .procname       = "leases-enable",
1740                 .data           = &leases_enable,
1741                 .maxlen         = sizeof(int),
1742                 .mode           = 0644,
1743                 .proc_handler   = proc_dointvec,
1744         },
1745 #endif
1746 #ifdef CONFIG_DNOTIFY
1747         {
1748                 .procname       = "dir-notify-enable",
1749                 .data           = &dir_notify_enable,
1750                 .maxlen         = sizeof(int),
1751                 .mode           = 0644,
1752                 .proc_handler   = proc_dointvec,
1753         },
1754 #endif
1755 #ifdef CONFIG_MMU
1756 #ifdef CONFIG_FILE_LOCKING
1757         {
1758                 .procname       = "lease-break-time",
1759                 .data           = &lease_break_time,
1760                 .maxlen         = sizeof(int),
1761                 .mode           = 0644,
1762                 .proc_handler   = proc_dointvec,
1763         },
1764 #endif
1765 #ifdef CONFIG_AIO
1766         {
1767                 .procname       = "aio-nr",
1768                 .data           = &aio_nr,
1769                 .maxlen         = sizeof(aio_nr),
1770                 .mode           = 0444,
1771                 .proc_handler   = proc_doulongvec_minmax,
1772         },
1773         {
1774                 .procname       = "aio-max-nr",
1775                 .data           = &aio_max_nr,
1776                 .maxlen         = sizeof(aio_max_nr),
1777                 .mode           = 0644,
1778                 .proc_handler   = proc_doulongvec_minmax,
1779         },
1780 #endif /* CONFIG_AIO */
1781 #ifdef CONFIG_INOTIFY_USER
1782         {
1783                 .procname       = "inotify",
1784                 .mode           = 0555,
1785                 .child          = inotify_table,
1786         },
1787 #endif
1788 #ifdef CONFIG_EPOLL
1789         {
1790                 .procname       = "epoll",
1791                 .mode           = 0555,
1792                 .child          = epoll_table,
1793         },
1794 #endif
1795 #endif
1796         {
1797                 .procname       = "protected_symlinks",
1798                 .data           = &sysctl_protected_symlinks,
1799                 .maxlen         = sizeof(int),
1800                 .mode           = 0600,
1801                 .proc_handler   = proc_dointvec_minmax,
1802                 .extra1         = &zero,
1803                 .extra2         = &one,
1804         },
1805         {
1806                 .procname       = "protected_hardlinks",
1807                 .data           = &sysctl_protected_hardlinks,
1808                 .maxlen         = sizeof(int),
1809                 .mode           = 0600,
1810                 .proc_handler   = proc_dointvec_minmax,
1811                 .extra1         = &zero,
1812                 .extra2         = &one,
1813         },
1814         {
1815                 .procname       = "protected_fifos",
1816                 .data           = &sysctl_protected_fifos,
1817                 .maxlen         = sizeof(int),
1818                 .mode           = 0600,
1819                 .proc_handler   = proc_dointvec_minmax,
1820                 .extra1         = &zero,
1821                 .extra2         = &two,
1822         },
1823         {
1824                 .procname       = "protected_regular",
1825                 .data           = &sysctl_protected_regular,
1826                 .maxlen         = sizeof(int),
1827                 .mode           = 0600,
1828                 .proc_handler   = proc_dointvec_minmax,
1829                 .extra1         = &zero,
1830                 .extra2         = &two,
1831         },
1832         {
1833                 .procname       = "suid_dumpable",
1834                 .data           = &suid_dumpable,
1835                 .maxlen         = sizeof(int),
1836                 .mode           = 0644,
1837                 .proc_handler   = proc_dointvec_minmax_coredump,
1838                 .extra1         = &zero,
1839                 .extra2         = &two,
1840         },
1841 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1842         {
1843                 .procname       = "binfmt_misc",
1844                 .mode           = 0555,
1845                 .child          = sysctl_mount_point,
1846         },
1847 #endif
1848         {
1849                 .procname       = "pipe-max-size",
1850                 .data           = &pipe_max_size,
1851                 .maxlen         = sizeof(pipe_max_size),
1852                 .mode           = 0644,
1853                 .proc_handler   = proc_dopipe_max_size,
1854         },
1855         {
1856                 .procname       = "pipe-user-pages-hard",
1857                 .data           = &pipe_user_pages_hard,
1858                 .maxlen         = sizeof(pipe_user_pages_hard),
1859                 .mode           = 0644,
1860                 .proc_handler   = proc_doulongvec_minmax,
1861         },
1862         {
1863                 .procname       = "pipe-user-pages-soft",
1864                 .data           = &pipe_user_pages_soft,
1865                 .maxlen         = sizeof(pipe_user_pages_soft),
1866                 .mode           = 0644,
1867                 .proc_handler   = proc_doulongvec_minmax,
1868         },
1869         {
1870                 .procname       = "mount-max",
1871                 .data           = &sysctl_mount_max,
1872                 .maxlen         = sizeof(unsigned int),
1873                 .mode           = 0644,
1874                 .proc_handler   = proc_dointvec_minmax,
1875                 .extra1         = &one,
1876         },
1877         { }
1878 };
1879
1880 static struct ctl_table debug_table[] = {
1881 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1882         {
1883                 .procname       = "exception-trace",
1884                 .data           = &show_unhandled_signals,
1885                 .maxlen         = sizeof(int),
1886                 .mode           = 0644,
1887                 .proc_handler   = proc_dointvec
1888         },
1889 #endif
1890 #if defined(CONFIG_OPTPROBES)
1891         {
1892                 .procname       = "kprobes-optimization",
1893                 .data           = &sysctl_kprobes_optimization,
1894                 .maxlen         = sizeof(int),
1895                 .mode           = 0644,
1896                 .proc_handler   = proc_kprobes_optimization_handler,
1897                 .extra1         = &zero,
1898                 .extra2         = &one,
1899         },
1900 #endif
1901         { }
1902 };
1903
1904 static struct ctl_table dev_table[] = {
1905         { }
1906 };
1907
1908 int __init sysctl_init(void)
1909 {
1910         struct ctl_table_header *hdr;
1911
1912         hdr = register_sysctl_table(sysctl_base_table);
1913         kmemleak_not_leak(hdr);
1914         return 0;
1915 }
1916
1917 #endif /* CONFIG_SYSCTL */
1918
1919 /*
1920  * /proc/sys support
1921  */
1922
1923 #ifdef CONFIG_PROC_SYSCTL
1924
1925 static int _proc_do_string(char *data, int maxlen, int write,
1926                            char __user *buffer,
1927                            size_t *lenp, loff_t *ppos)
1928 {
1929         size_t len;
1930         char __user *p;
1931         char c;
1932
1933         if (!data || !maxlen || !*lenp) {
1934                 *lenp = 0;
1935                 return 0;
1936         }
1937
1938         if (write) {
1939                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1940                         /* Only continue writes not past the end of buffer. */
1941                         len = strlen(data);
1942                         if (len > maxlen - 1)
1943                                 len = maxlen - 1;
1944
1945                         if (*ppos > len)
1946                                 return 0;
1947                         len = *ppos;
1948                 } else {
1949                         /* Start writing from beginning of buffer. */
1950                         len = 0;
1951                 }
1952
1953                 *ppos += *lenp;
1954                 p = buffer;
1955                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1956                         if (get_user(c, p++))
1957                                 return -EFAULT;
1958                         if (c == 0 || c == '\n')
1959                                 break;
1960                         data[len++] = c;
1961                 }
1962                 data[len] = 0;
1963         } else {
1964                 len = strlen(data);
1965                 if (len > maxlen)
1966                         len = maxlen;
1967
1968                 if (*ppos > len) {
1969                         *lenp = 0;
1970                         return 0;
1971                 }
1972
1973                 data += *ppos;
1974                 len  -= *ppos;
1975
1976                 if (len > *lenp)
1977                         len = *lenp;
1978                 if (len)
1979                         if (copy_to_user(buffer, data, len))
1980                                 return -EFAULT;
1981                 if (len < *lenp) {
1982                         if (put_user('\n', buffer + len))
1983                                 return -EFAULT;
1984                         len++;
1985                 }
1986                 *lenp = len;
1987                 *ppos += len;
1988         }
1989         return 0;
1990 }
1991
1992 static void warn_sysctl_write(struct ctl_table *table)
1993 {
1994         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1995                 "This will not be supported in the future. To silence this\n"
1996                 "warning, set kernel.sysctl_writes_strict = -1\n",
1997                 current->comm, table->procname);
1998 }
1999
2000 /**
2001  * proc_first_pos_non_zero_ignore - check if first position is allowed
2002  * @ppos: file position
2003  * @table: the sysctl table
2004  *
2005  * Returns true if the first position is non-zero and the sysctl_writes_strict
2006  * mode indicates this is not allowed for numeric input types. String proc
2007  * handlers can ignore the return value.
2008  */
2009 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2010                                            struct ctl_table *table)
2011 {
2012         if (!*ppos)
2013                 return false;
2014
2015         switch (sysctl_writes_strict) {
2016         case SYSCTL_WRITES_STRICT:
2017                 return true;
2018         case SYSCTL_WRITES_WARN:
2019                 warn_sysctl_write(table);
2020                 return false;
2021         default:
2022                 return false;
2023         }
2024 }
2025
2026 /**
2027  * proc_dostring - read a string sysctl
2028  * @table: the sysctl table
2029  * @write: %TRUE if this is a write to the sysctl file
2030  * @buffer: the user buffer
2031  * @lenp: the size of the user buffer
2032  * @ppos: file position
2033  *
2034  * Reads/writes a string from/to the user buffer. If the kernel
2035  * buffer provided is not large enough to hold the string, the
2036  * string is truncated. The copied string is %NULL-terminated.
2037  * If the string is being read by the user process, it is copied
2038  * and a newline '\n' is added. It is truncated if the buffer is
2039  * not large enough.
2040  *
2041  * Returns 0 on success.
2042  */
2043 int proc_dostring(struct ctl_table *table, int write,
2044                   void __user *buffer, size_t *lenp, loff_t *ppos)
2045 {
2046         if (write)
2047                 proc_first_pos_non_zero_ignore(ppos, table);
2048
2049         return _proc_do_string((char *)(table->data), table->maxlen, write,
2050                                (char __user *)buffer, lenp, ppos);
2051 }
2052
2053 static size_t proc_skip_spaces(char **buf)
2054 {
2055         size_t ret;
2056         char *tmp = skip_spaces(*buf);
2057         ret = tmp - *buf;
2058         *buf = tmp;
2059         return ret;
2060 }
2061
2062 static void proc_skip_char(char **buf, size_t *size, const char v)
2063 {
2064         while (*size) {
2065                 if (**buf != v)
2066                         break;
2067                 (*size)--;
2068                 (*buf)++;
2069         }
2070 }
2071
2072 #define TMPBUFLEN 22
2073 /**
2074  * proc_get_long - reads an ASCII formatted integer from a user buffer
2075  *
2076  * @buf: a kernel buffer
2077  * @size: size of the kernel buffer
2078  * @val: this is where the number will be stored
2079  * @neg: set to %TRUE if number is negative
2080  * @perm_tr: a vector which contains the allowed trailers
2081  * @perm_tr_len: size of the perm_tr vector
2082  * @tr: pointer to store the trailer character
2083  *
2084  * In case of success %0 is returned and @buf and @size are updated with
2085  * the amount of bytes read. If @tr is non-NULL and a trailing
2086  * character exists (size is non-zero after returning from this
2087  * function), @tr is updated with the trailing character.
2088  */
2089 static int proc_get_long(char **buf, size_t *size,
2090                           unsigned long *val, bool *neg,
2091                           const char *perm_tr, unsigned perm_tr_len, char *tr)
2092 {
2093         int len;
2094         char *p, tmp[TMPBUFLEN];
2095
2096         if (!*size)
2097                 return -EINVAL;
2098
2099         len = *size;
2100         if (len > TMPBUFLEN - 1)
2101                 len = TMPBUFLEN - 1;
2102
2103         memcpy(tmp, *buf, len);
2104
2105         tmp[len] = 0;
2106         p = tmp;
2107         if (*p == '-' && *size > 1) {
2108                 *neg = true;
2109                 p++;
2110         } else
2111                 *neg = false;
2112         if (!isdigit(*p))
2113                 return -EINVAL;
2114
2115         *val = simple_strtoul(p, &p, 0);
2116
2117         len = p - tmp;
2118
2119         /* We don't know if the next char is whitespace thus we may accept
2120          * invalid integers (e.g. 1234...a) or two integers instead of one
2121          * (e.g. 123...1). So lets not allow such large numbers. */
2122         if (len == TMPBUFLEN - 1)
2123                 return -EINVAL;
2124
2125         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2126                 return -EINVAL;
2127
2128         if (tr && (len < *size))
2129                 *tr = *p;
2130
2131         *buf += len;
2132         *size -= len;
2133
2134         return 0;
2135 }
2136
2137 /**
2138  * proc_put_long - converts an integer to a decimal ASCII formatted string
2139  *
2140  * @buf: the user buffer
2141  * @size: the size of the user buffer
2142  * @val: the integer to be converted
2143  * @neg: sign of the number, %TRUE for negative
2144  *
2145  * In case of success %0 is returned and @buf and @size are updated with
2146  * the amount of bytes written.
2147  */
2148 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2149                           bool neg)
2150 {
2151         int len;
2152         char tmp[TMPBUFLEN], *p = tmp;
2153
2154         sprintf(p, "%s%lu", neg ? "-" : "", val);
2155         len = strlen(tmp);
2156         if (len > *size)
2157                 len = *size;
2158         if (copy_to_user(*buf, tmp, len))
2159                 return -EFAULT;
2160         *size -= len;
2161         *buf += len;
2162         return 0;
2163 }
2164 #undef TMPBUFLEN
2165
2166 static int proc_put_char(void __user **buf, size_t *size, char c)
2167 {
2168         if (*size) {
2169                 char __user **buffer = (char __user **)buf;
2170                 if (put_user(c, *buffer))
2171                         return -EFAULT;
2172                 (*size)--, (*buffer)++;
2173                 *buf = *buffer;
2174         }
2175         return 0;
2176 }
2177
2178 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2179                                  int *valp,
2180                                  int write, void *data)
2181 {
2182         if (write) {
2183                 if (*negp) {
2184                         if (*lvalp > (unsigned long) INT_MAX + 1)
2185                                 return -EINVAL;
2186                         *valp = -*lvalp;
2187                 } else {
2188                         if (*lvalp > (unsigned long) INT_MAX)
2189                                 return -EINVAL;
2190                         *valp = *lvalp;
2191                 }
2192         } else {
2193                 int val = *valp;
2194                 if (val < 0) {
2195                         *negp = true;
2196                         *lvalp = -(unsigned long)val;
2197                 } else {
2198                         *negp = false;
2199                         *lvalp = (unsigned long)val;
2200                 }
2201         }
2202         return 0;
2203 }
2204
2205 static int do_proc_douintvec_conv(unsigned long *lvalp,
2206                                   unsigned int *valp,
2207                                   int write, void *data)
2208 {
2209         if (write) {
2210                 if (*lvalp > UINT_MAX)
2211                         return -EINVAL;
2212                 *valp = *lvalp;
2213         } else {
2214                 unsigned int val = *valp;
2215                 *lvalp = (unsigned long)val;
2216         }
2217         return 0;
2218 }
2219
2220 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2221
2222 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2223                   int write, void __user *buffer,
2224                   size_t *lenp, loff_t *ppos,
2225                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2226                               int write, void *data),
2227                   void *data)
2228 {
2229         int *i, vleft, first = 1, err = 0;
2230         size_t left;
2231         char *kbuf = NULL, *p;
2232
2233         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2234                 *lenp = 0;
2235                 return 0;
2236         }
2237
2238         i = (int *) tbl_data;
2239         vleft = table->maxlen / sizeof(*i);
2240         left = *lenp;
2241
2242         if (!conv)
2243                 conv = do_proc_dointvec_conv;
2244
2245         if (write) {
2246                 if (proc_first_pos_non_zero_ignore(ppos, table))
2247                         goto out;
2248
2249                 if (left > PAGE_SIZE - 1)
2250                         left = PAGE_SIZE - 1;
2251                 p = kbuf = memdup_user_nul(buffer, left);
2252                 if (IS_ERR(kbuf))
2253                         return PTR_ERR(kbuf);
2254         }
2255
2256         for (; left && vleft--; i++, first=0) {
2257                 unsigned long lval;
2258                 bool neg;
2259
2260                 if (write) {
2261                         left -= proc_skip_spaces(&p);
2262
2263                         if (!left)
2264                                 break;
2265                         err = proc_get_long(&p, &left, &lval, &neg,
2266                                              proc_wspace_sep,
2267                                              sizeof(proc_wspace_sep), NULL);
2268                         if (err)
2269                                 break;
2270                         if (conv(&neg, &lval, i, 1, data)) {
2271                                 err = -EINVAL;
2272                                 break;
2273                         }
2274                 } else {
2275                         if (conv(&neg, &lval, i, 0, data)) {
2276                                 err = -EINVAL;
2277                                 break;
2278                         }
2279                         if (!first)
2280                                 err = proc_put_char(&buffer, &left, '\t');
2281                         if (err)
2282                                 break;
2283                         err = proc_put_long(&buffer, &left, lval, neg);
2284                         if (err)
2285                                 break;
2286                 }
2287         }
2288
2289         if (!write && !first && left && !err)
2290                 err = proc_put_char(&buffer, &left, '\n');
2291         if (write && !err && left)
2292                 left -= proc_skip_spaces(&p);
2293         if (write) {
2294                 kfree(kbuf);
2295                 if (first)
2296                         return err ? : -EINVAL;
2297         }
2298         *lenp -= left;
2299 out:
2300         *ppos += *lenp;
2301         return err;
2302 }
2303
2304 static int do_proc_dointvec(struct ctl_table *table, int write,
2305                   void __user *buffer, size_t *lenp, loff_t *ppos,
2306                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2307                               int write, void *data),
2308                   void *data)
2309 {
2310         return __do_proc_dointvec(table->data, table, write,
2311                         buffer, lenp, ppos, conv, data);
2312 }
2313
2314 static int do_proc_douintvec_w(unsigned int *tbl_data,
2315                                struct ctl_table *table,
2316                                void __user *buffer,
2317                                size_t *lenp, loff_t *ppos,
2318                                int (*conv)(unsigned long *lvalp,
2319                                            unsigned int *valp,
2320                                            int write, void *data),
2321                                void *data)
2322 {
2323         unsigned long lval;
2324         int err = 0;
2325         size_t left;
2326         bool neg;
2327         char *kbuf = NULL, *p;
2328
2329         left = *lenp;
2330
2331         if (proc_first_pos_non_zero_ignore(ppos, table))
2332                 goto bail_early;
2333
2334         if (left > PAGE_SIZE - 1)
2335                 left = PAGE_SIZE - 1;
2336
2337         p = kbuf = memdup_user_nul(buffer, left);
2338         if (IS_ERR(kbuf))
2339                 return -EINVAL;
2340
2341         left -= proc_skip_spaces(&p);
2342         if (!left) {
2343                 err = -EINVAL;
2344                 goto out_free;
2345         }
2346
2347         err = proc_get_long(&p, &left, &lval, &neg,
2348                              proc_wspace_sep,
2349                              sizeof(proc_wspace_sep), NULL);
2350         if (err || neg) {
2351                 err = -EINVAL;
2352                 goto out_free;
2353         }
2354
2355         if (conv(&lval, tbl_data, 1, data)) {
2356                 err = -EINVAL;
2357                 goto out_free;
2358         }
2359
2360         if (!err && left)
2361                 left -= proc_skip_spaces(&p);
2362
2363 out_free:
2364         kfree(kbuf);
2365         if (err)
2366                 return -EINVAL;
2367
2368         return 0;
2369
2370         /* This is in keeping with old __do_proc_dointvec() */
2371 bail_early:
2372         *ppos += *lenp;
2373         return err;
2374 }
2375
2376 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2377                                size_t *lenp, loff_t *ppos,
2378                                int (*conv)(unsigned long *lvalp,
2379                                            unsigned int *valp,
2380                                            int write, void *data),
2381                                void *data)
2382 {
2383         unsigned long lval;
2384         int err = 0;
2385         size_t left;
2386
2387         left = *lenp;
2388
2389         if (conv(&lval, tbl_data, 0, data)) {
2390                 err = -EINVAL;
2391                 goto out;
2392         }
2393
2394         err = proc_put_long(&buffer, &left, lval, false);
2395         if (err || !left)
2396                 goto out;
2397
2398         err = proc_put_char(&buffer, &left, '\n');
2399
2400 out:
2401         *lenp -= left;
2402         *ppos += *lenp;
2403
2404         return err;
2405 }
2406
2407 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2408                                int write, void __user *buffer,
2409                                size_t *lenp, loff_t *ppos,
2410                                int (*conv)(unsigned long *lvalp,
2411                                            unsigned int *valp,
2412                                            int write, void *data),
2413                                void *data)
2414 {
2415         unsigned int *i, vleft;
2416
2417         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2418                 *lenp = 0;
2419                 return 0;
2420         }
2421
2422         i = (unsigned int *) tbl_data;
2423         vleft = table->maxlen / sizeof(*i);
2424
2425         /*
2426          * Arrays are not supported, keep this simple. *Do not* add
2427          * support for them.
2428          */
2429         if (vleft != 1) {
2430                 *lenp = 0;
2431                 return -EINVAL;
2432         }
2433
2434         if (!conv)
2435                 conv = do_proc_douintvec_conv;
2436
2437         if (write)
2438                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2439                                            conv, data);
2440         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2441 }
2442
2443 static int do_proc_douintvec(struct ctl_table *table, int write,
2444                              void __user *buffer, size_t *lenp, loff_t *ppos,
2445                              int (*conv)(unsigned long *lvalp,
2446                                          unsigned int *valp,
2447                                          int write, void *data),
2448                              void *data)
2449 {
2450         return __do_proc_douintvec(table->data, table, write,
2451                                    buffer, lenp, ppos, conv, data);
2452 }
2453
2454 /**
2455  * proc_dointvec - read a vector of integers
2456  * @table: the sysctl table
2457  * @write: %TRUE if this is a write to the sysctl file
2458  * @buffer: the user buffer
2459  * @lenp: the size of the user buffer
2460  * @ppos: file position
2461  *
2462  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2463  * values from/to the user buffer, treated as an ASCII string.
2464  *
2465  * Returns 0 on success.
2466  */
2467 int proc_dointvec(struct ctl_table *table, int write,
2468                      void __user *buffer, size_t *lenp, loff_t *ppos)
2469 {
2470         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2471 }
2472
2473 /**
2474  * proc_douintvec - read a vector of unsigned integers
2475  * @table: the sysctl table
2476  * @write: %TRUE if this is a write to the sysctl file
2477  * @buffer: the user buffer
2478  * @lenp: the size of the user buffer
2479  * @ppos: file position
2480  *
2481  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2482  * values from/to the user buffer, treated as an ASCII string.
2483  *
2484  * Returns 0 on success.
2485  */
2486 int proc_douintvec(struct ctl_table *table, int write,
2487                      void __user *buffer, size_t *lenp, loff_t *ppos)
2488 {
2489         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2490                                  do_proc_douintvec_conv, NULL);
2491 }
2492
2493 /*
2494  * Taint values can only be increased
2495  * This means we can safely use a temporary.
2496  */
2497 static int proc_taint(struct ctl_table *table, int write,
2498                                void __user *buffer, size_t *lenp, loff_t *ppos)
2499 {
2500         struct ctl_table t;
2501         unsigned long tmptaint = get_taint();
2502         int err;
2503
2504         if (write && !capable(CAP_SYS_ADMIN))
2505                 return -EPERM;
2506
2507         t = *table;
2508         t.data = &tmptaint;
2509         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2510         if (err < 0)
2511                 return err;
2512
2513         if (write) {
2514                 /*
2515                  * Poor man's atomic or. Not worth adding a primitive
2516                  * to everyone's atomic.h for this
2517                  */
2518                 int i;
2519                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2520                         if ((tmptaint >> i) & 1)
2521                                 add_taint(i, LOCKDEP_STILL_OK);
2522                 }
2523         }
2524
2525         return err;
2526 }
2527
2528 #ifdef CONFIG_PRINTK
2529 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2530                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2531 {
2532         if (write && !capable(CAP_SYS_ADMIN))
2533                 return -EPERM;
2534
2535         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2536 }
2537 #endif
2538
2539 /**
2540  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2541  * @min: pointer to minimum allowable value
2542  * @max: pointer to maximum allowable value
2543  *
2544  * The do_proc_dointvec_minmax_conv_param structure provides the
2545  * minimum and maximum values for doing range checking for those sysctl
2546  * parameters that use the proc_dointvec_minmax() handler.
2547  */
2548 struct do_proc_dointvec_minmax_conv_param {
2549         int *min;
2550         int *max;
2551 };
2552
2553 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2554                                         int *valp,
2555                                         int write, void *data)
2556 {
2557         struct do_proc_dointvec_minmax_conv_param *param = data;
2558         if (write) {
2559                 int val;
2560                 if (*negp) {
2561                         if (*lvalp > (unsigned long) INT_MAX + 1)
2562                                 return -EINVAL;
2563                         val = -*lvalp;
2564                 } else {
2565                         if (*lvalp > (unsigned long) INT_MAX)
2566                                 return -EINVAL;
2567                         val = *lvalp;
2568                 }
2569                 if ((param->min && *param->min > val) ||
2570                     (param->max && *param->max < val))
2571                         return -EINVAL;
2572                 *valp = val;
2573         } else {
2574                 int val = *valp;
2575                 if (val < 0) {
2576                         *negp = true;
2577                         *lvalp = -(unsigned long)val;
2578                 } else {
2579                         *negp = false;
2580                         *lvalp = (unsigned long)val;
2581                 }
2582         }
2583         return 0;
2584 }
2585
2586 /**
2587  * proc_dointvec_minmax - read a vector of integers with min/max values
2588  * @table: the sysctl table
2589  * @write: %TRUE if this is a write to the sysctl file
2590  * @buffer: the user buffer
2591  * @lenp: the size of the user buffer
2592  * @ppos: file position
2593  *
2594  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2595  * values from/to the user buffer, treated as an ASCII string.
2596  *
2597  * This routine will ensure the values are within the range specified by
2598  * table->extra1 (min) and table->extra2 (max).
2599  *
2600  * Returns 0 on success or -EINVAL on write when the range check fails.
2601  */
2602 int proc_dointvec_minmax(struct ctl_table *table, int write,
2603                   void __user *buffer, size_t *lenp, loff_t *ppos)
2604 {
2605         struct do_proc_dointvec_minmax_conv_param param = {
2606                 .min = (int *) table->extra1,
2607                 .max = (int *) table->extra2,
2608         };
2609         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2610                                 do_proc_dointvec_minmax_conv, &param);
2611 }
2612
2613 /**
2614  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2615  * @min: pointer to minimum allowable value
2616  * @max: pointer to maximum allowable value
2617  *
2618  * The do_proc_douintvec_minmax_conv_param structure provides the
2619  * minimum and maximum values for doing range checking for those sysctl
2620  * parameters that use the proc_douintvec_minmax() handler.
2621  */
2622 struct do_proc_douintvec_minmax_conv_param {
2623         unsigned int *min;
2624         unsigned int *max;
2625 };
2626
2627 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2628                                          unsigned int *valp,
2629                                          int write, void *data)
2630 {
2631         struct do_proc_douintvec_minmax_conv_param *param = data;
2632
2633         if (write) {
2634                 unsigned int val = *lvalp;
2635
2636                 if (*lvalp > UINT_MAX)
2637                         return -EINVAL;
2638
2639                 if ((param->min && *param->min > val) ||
2640                     (param->max && *param->max < val))
2641                         return -ERANGE;
2642
2643                 *valp = val;
2644         } else {
2645                 unsigned int val = *valp;
2646                 *lvalp = (unsigned long) val;
2647         }
2648
2649         return 0;
2650 }
2651
2652 /**
2653  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2654  * @table: the sysctl table
2655  * @write: %TRUE if this is a write to the sysctl file
2656  * @buffer: the user buffer
2657  * @lenp: the size of the user buffer
2658  * @ppos: file position
2659  *
2660  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2661  * values from/to the user buffer, treated as an ASCII string. Negative
2662  * strings are not allowed.
2663  *
2664  * This routine will ensure the values are within the range specified by
2665  * table->extra1 (min) and table->extra2 (max). There is a final sanity
2666  * check for UINT_MAX to avoid having to support wrap around uses from
2667  * userspace.
2668  *
2669  * Returns 0 on success or -ERANGE on write when the range check fails.
2670  */
2671 int proc_douintvec_minmax(struct ctl_table *table, int write,
2672                           void __user *buffer, size_t *lenp, loff_t *ppos)
2673 {
2674         struct do_proc_douintvec_minmax_conv_param param = {
2675                 .min = (unsigned int *) table->extra1,
2676                 .max = (unsigned int *) table->extra2,
2677         };
2678         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2679                                  do_proc_douintvec_minmax_conv, &param);
2680 }
2681
2682 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2683                                         unsigned int *valp,
2684                                         int write, void *data)
2685 {
2686         if (write) {
2687                 unsigned int val;
2688
2689                 val = round_pipe_size(*lvalp);
2690                 if (val == 0)
2691                         return -EINVAL;
2692
2693                 *valp = val;
2694         } else {
2695                 unsigned int val = *valp;
2696                 *lvalp = (unsigned long) val;
2697         }
2698
2699         return 0;
2700 }
2701
2702 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2703                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2704 {
2705         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2706                                  do_proc_dopipe_max_size_conv, NULL);
2707 }
2708
2709 static void validate_coredump_safety(void)
2710 {
2711 #ifdef CONFIG_COREDUMP
2712         if (suid_dumpable == SUID_DUMP_ROOT &&
2713             core_pattern[0] != '/' && core_pattern[0] != '|') {
2714                 printk(KERN_WARNING
2715 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2716 "Pipe handler or fully qualified core dump path required.\n"
2717 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2718                 );
2719         }
2720 #endif
2721 }
2722
2723 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2724                 void __user *buffer, size_t *lenp, loff_t *ppos)
2725 {
2726         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2727         if (!error)
2728                 validate_coredump_safety();
2729         return error;
2730 }
2731
2732 #ifdef CONFIG_COREDUMP
2733 static int proc_dostring_coredump(struct ctl_table *table, int write,
2734                   void __user *buffer, size_t *lenp, loff_t *ppos)
2735 {
2736         int error = proc_dostring(table, write, buffer, lenp, ppos);
2737         if (!error)
2738                 validate_coredump_safety();
2739         return error;
2740 }
2741 #endif
2742
2743 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2744                                      void __user *buffer,
2745                                      size_t *lenp, loff_t *ppos,
2746                                      unsigned long convmul,
2747                                      unsigned long convdiv)
2748 {
2749         unsigned long *i, *min, *max;
2750         int vleft, first = 1, err = 0;
2751         size_t left;
2752         char *kbuf = NULL, *p;
2753
2754         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2755                 *lenp = 0;
2756                 return 0;
2757         }
2758
2759         i = (unsigned long *) data;
2760         min = (unsigned long *) table->extra1;
2761         max = (unsigned long *) table->extra2;
2762         vleft = table->maxlen / sizeof(unsigned long);
2763         left = *lenp;
2764
2765         if (write) {
2766                 if (proc_first_pos_non_zero_ignore(ppos, table))
2767                         goto out;
2768
2769                 if (left > PAGE_SIZE - 1)
2770                         left = PAGE_SIZE - 1;
2771                 p = kbuf = memdup_user_nul(buffer, left);
2772                 if (IS_ERR(kbuf))
2773                         return PTR_ERR(kbuf);
2774         }
2775
2776         for (; left && vleft--; i++, first = 0) {
2777                 unsigned long val;
2778
2779                 if (write) {
2780                         bool neg;
2781
2782                         left -= proc_skip_spaces(&p);
2783                         if (!left)
2784                                 break;
2785
2786                         err = proc_get_long(&p, &left, &val, &neg,
2787                                              proc_wspace_sep,
2788                                              sizeof(proc_wspace_sep), NULL);
2789                         if (err)
2790                                 break;
2791                         if (neg)
2792                                 continue;
2793                         val = convmul * val / convdiv;
2794                         if ((min && val < *min) || (max && val > *max)) {
2795                                 err = -EINVAL;
2796                                 break;
2797                         }
2798                         *i = val;
2799                 } else {
2800                         val = convdiv * (*i) / convmul;
2801                         if (!first) {
2802                                 err = proc_put_char(&buffer, &left, '\t');
2803                                 if (err)
2804                                         break;
2805                         }
2806                         err = proc_put_long(&buffer, &left, val, false);
2807                         if (err)
2808                                 break;
2809                 }
2810         }
2811
2812         if (!write && !first && left && !err)
2813                 err = proc_put_char(&buffer, &left, '\n');
2814         if (write && !err)
2815                 left -= proc_skip_spaces(&p);
2816         if (write) {
2817                 kfree(kbuf);
2818                 if (first)
2819                         return err ? : -EINVAL;
2820         }
2821         *lenp -= left;
2822 out:
2823         *ppos += *lenp;
2824         return err;
2825 }
2826
2827 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2828                                      void __user *buffer,
2829                                      size_t *lenp, loff_t *ppos,
2830                                      unsigned long convmul,
2831                                      unsigned long convdiv)
2832 {
2833         return __do_proc_doulongvec_minmax(table->data, table, write,
2834                         buffer, lenp, ppos, convmul, convdiv);
2835 }
2836
2837 /**
2838  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2839  * @table: the sysctl table
2840  * @write: %TRUE if this is a write to the sysctl file
2841  * @buffer: the user buffer
2842  * @lenp: the size of the user buffer
2843  * @ppos: file position
2844  *
2845  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2846  * values from/to the user buffer, treated as an ASCII string.
2847  *
2848  * This routine will ensure the values are within the range specified by
2849  * table->extra1 (min) and table->extra2 (max).
2850  *
2851  * Returns 0 on success.
2852  */
2853 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2854                            void __user *buffer, size_t *lenp, loff_t *ppos)
2855 {
2856     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2857 }
2858
2859 /**
2860  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2861  * @table: the sysctl table
2862  * @write: %TRUE if this is a write to the sysctl file
2863  * @buffer: the user buffer
2864  * @lenp: the size of the user buffer
2865  * @ppos: file position
2866  *
2867  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2868  * values from/to the user buffer, treated as an ASCII string. The values
2869  * are treated as milliseconds, and converted to jiffies when they are stored.
2870  *
2871  * This routine will ensure the values are within the range specified by
2872  * table->extra1 (min) and table->extra2 (max).
2873  *
2874  * Returns 0 on success.
2875  */
2876 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2877                                       void __user *buffer,
2878                                       size_t *lenp, loff_t *ppos)
2879 {
2880     return do_proc_doulongvec_minmax(table, write, buffer,
2881                                      lenp, ppos, HZ, 1000l);
2882 }
2883
2884
2885 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2886                                          int *valp,
2887                                          int write, void *data)
2888 {
2889         if (write) {
2890                 if (*lvalp > INT_MAX / HZ)
2891                         return 1;
2892                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2893         } else {
2894                 int val = *valp;
2895                 unsigned long lval;
2896                 if (val < 0) {
2897                         *negp = true;
2898                         lval = -(unsigned long)val;
2899                 } else {
2900                         *negp = false;
2901                         lval = (unsigned long)val;
2902                 }
2903                 *lvalp = lval / HZ;
2904         }
2905         return 0;
2906 }
2907
2908 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2909                                                 int *valp,
2910                                                 int write, void *data)
2911 {
2912         if (write) {
2913                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2914                         return 1;
2915                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2916         } else {
2917                 int val = *valp;
2918                 unsigned long lval;
2919                 if (val < 0) {
2920                         *negp = true;
2921                         lval = -(unsigned long)val;
2922                 } else {
2923                         *negp = false;
2924                         lval = (unsigned long)val;
2925                 }
2926                 *lvalp = jiffies_to_clock_t(lval);
2927         }
2928         return 0;
2929 }
2930
2931 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2932                                             int *valp,
2933                                             int write, void *data)
2934 {
2935         if (write) {
2936                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2937
2938                 if (jif > INT_MAX)
2939                         return 1;
2940                 *valp = (int)jif;
2941         } else {
2942                 int val = *valp;
2943                 unsigned long lval;
2944                 if (val < 0) {
2945                         *negp = true;
2946                         lval = -(unsigned long)val;
2947                 } else {
2948                         *negp = false;
2949                         lval = (unsigned long)val;
2950                 }
2951                 *lvalp = jiffies_to_msecs(lval);
2952         }
2953         return 0;
2954 }
2955
2956 /**
2957  * proc_dointvec_jiffies - read a vector of integers as seconds
2958  * @table: the sysctl table
2959  * @write: %TRUE if this is a write to the sysctl file
2960  * @buffer: the user buffer
2961  * @lenp: the size of the user buffer
2962  * @ppos: file position
2963  *
2964  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2965  * values from/to the user buffer, treated as an ASCII string.
2966  * The values read are assumed to be in seconds, and are converted into
2967  * jiffies.
2968  *
2969  * Returns 0 on success.
2970  */
2971 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2972                           void __user *buffer, size_t *lenp, loff_t *ppos)
2973 {
2974     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2975                             do_proc_dointvec_jiffies_conv,NULL);
2976 }
2977
2978 /**
2979  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2980  * @table: the sysctl table
2981  * @write: %TRUE if this is a write to the sysctl file
2982  * @buffer: the user buffer
2983  * @lenp: the size of the user buffer
2984  * @ppos: pointer to the file position
2985  *
2986  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2987  * values from/to the user buffer, treated as an ASCII string.
2988  * The values read are assumed to be in 1/USER_HZ seconds, and
2989  * are converted into jiffies.
2990  *
2991  * Returns 0 on success.
2992  */
2993 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2994                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2995 {
2996     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2997                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2998 }
2999
3000 /**
3001  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3002  * @table: the sysctl table
3003  * @write: %TRUE if this is a write to the sysctl file
3004  * @buffer: the user buffer
3005  * @lenp: the size of the user buffer
3006  * @ppos: file position
3007  * @ppos: the current position in the file
3008  *
3009  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3010  * values from/to the user buffer, treated as an ASCII string.
3011  * The values read are assumed to be in 1/1000 seconds, and
3012  * are converted into jiffies.
3013  *
3014  * Returns 0 on success.
3015  */
3016 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3017                              void __user *buffer, size_t *lenp, loff_t *ppos)
3018 {
3019         return do_proc_dointvec(table, write, buffer, lenp, ppos,
3020                                 do_proc_dointvec_ms_jiffies_conv, NULL);
3021 }
3022
3023 static int proc_do_cad_pid(struct ctl_table *table, int write,
3024                            void __user *buffer, size_t *lenp, loff_t *ppos)
3025 {
3026         struct pid *new_pid;
3027         pid_t tmp;
3028         int r;
3029
3030         tmp = pid_vnr(cad_pid);
3031
3032         r = __do_proc_dointvec(&tmp, table, write, buffer,
3033                                lenp, ppos, NULL, NULL);
3034         if (r || !write)
3035                 return r;
3036
3037         new_pid = find_get_pid(tmp);
3038         if (!new_pid)
3039                 return -ESRCH;
3040
3041         put_pid(xchg(&cad_pid, new_pid));
3042         return 0;
3043 }
3044
3045 /**
3046  * proc_do_large_bitmap - read/write from/to a large bitmap
3047  * @table: the sysctl table
3048  * @write: %TRUE if this is a write to the sysctl file
3049  * @buffer: the user buffer
3050  * @lenp: the size of the user buffer
3051  * @ppos: file position
3052  *
3053  * The bitmap is stored at table->data and the bitmap length (in bits)
3054  * in table->maxlen.
3055  *
3056  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3057  * large bitmaps may be represented in a compact manner. Writing into
3058  * the file will clear the bitmap then update it with the given input.
3059  *
3060  * Returns 0 on success.
3061  */
3062 int proc_do_large_bitmap(struct ctl_table *table, int write,
3063                          void __user *buffer, size_t *lenp, loff_t *ppos)
3064 {
3065         int err = 0;
3066         bool first = 1;
3067         size_t left = *lenp;
3068         unsigned long bitmap_len = table->maxlen;
3069         unsigned long *bitmap = *(unsigned long **) table->data;
3070         unsigned long *tmp_bitmap = NULL;
3071         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3072
3073         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3074                 *lenp = 0;
3075                 return 0;
3076         }
3077
3078         if (write) {
3079                 char *kbuf, *p;
3080
3081                 if (left > PAGE_SIZE - 1)
3082                         left = PAGE_SIZE - 1;
3083
3084                 p = kbuf = memdup_user_nul(buffer, left);
3085                 if (IS_ERR(kbuf))
3086                         return PTR_ERR(kbuf);
3087
3088                 tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len),
3089                                      sizeof(unsigned long),
3090                                      GFP_KERNEL);
3091                 if (!tmp_bitmap) {
3092                         kfree(kbuf);
3093                         return -ENOMEM;
3094                 }
3095                 proc_skip_char(&p, &left, '\n');
3096                 while (!err && left) {
3097                         unsigned long val_a, val_b;
3098                         bool neg;
3099
3100                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3101                                              sizeof(tr_a), &c);
3102                         if (err)
3103                                 break;
3104                         if (val_a >= bitmap_len || neg) {
3105                                 err = -EINVAL;
3106                                 break;
3107                         }
3108
3109                         val_b = val_a;
3110                         if (left) {
3111                                 p++;
3112                                 left--;
3113                         }
3114
3115                         if (c == '-') {
3116                                 err = proc_get_long(&p, &left, &val_b,
3117                                                      &neg, tr_b, sizeof(tr_b),
3118                                                      &c);
3119                                 if (err)
3120                                         break;
3121                                 if (val_b >= bitmap_len || neg ||
3122                                     val_a > val_b) {
3123                                         err = -EINVAL;
3124                                         break;
3125                                 }
3126                                 if (left) {
3127                                         p++;
3128                                         left--;
3129                                 }
3130                         }
3131
3132                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3133                         first = 0;
3134                         proc_skip_char(&p, &left, '\n');
3135                 }
3136                 kfree(kbuf);
3137         } else {
3138                 unsigned long bit_a, bit_b = 0;
3139
3140                 while (left) {
3141                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3142                         if (bit_a >= bitmap_len)
3143                                 break;
3144                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
3145                                                    bit_a + 1) - 1;
3146
3147                         if (!first) {
3148                                 err = proc_put_char(&buffer, &left, ',');
3149                                 if (err)
3150                                         break;
3151                         }
3152                         err = proc_put_long(&buffer, &left, bit_a, false);
3153                         if (err)
3154                                 break;
3155                         if (bit_a != bit_b) {
3156                                 err = proc_put_char(&buffer, &left, '-');
3157                                 if (err)
3158                                         break;
3159                                 err = proc_put_long(&buffer, &left, bit_b, false);
3160                                 if (err)
3161                                         break;
3162                         }
3163
3164                         first = 0; bit_b++;
3165                 }
3166                 if (!err)
3167                         err = proc_put_char(&buffer, &left, '\n');
3168         }
3169
3170         if (!err) {
3171                 if (write) {
3172                         if (*ppos)
3173                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3174                         else
3175                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3176                 }
3177                 *lenp -= left;
3178                 *ppos += *lenp;
3179         }
3180
3181         kfree(tmp_bitmap);
3182         return err;
3183 }
3184
3185 #else /* CONFIG_PROC_SYSCTL */
3186
3187 int proc_dostring(struct ctl_table *table, int write,
3188                   void __user *buffer, size_t *lenp, loff_t *ppos)
3189 {
3190         return -ENOSYS;
3191 }
3192
3193 int proc_dointvec(struct ctl_table *table, int write,
3194                   void __user *buffer, size_t *lenp, loff_t *ppos)
3195 {
3196         return -ENOSYS;
3197 }
3198
3199 int proc_douintvec(struct ctl_table *table, int write,
3200                   void __user *buffer, size_t *lenp, loff_t *ppos)
3201 {
3202         return -ENOSYS;
3203 }
3204
3205 int proc_dointvec_minmax(struct ctl_table *table, int write,
3206                     void __user *buffer, size_t *lenp, loff_t *ppos)
3207 {
3208         return -ENOSYS;
3209 }
3210
3211 int proc_douintvec_minmax(struct ctl_table *table, int write,
3212                           void __user *buffer, size_t *lenp, loff_t *ppos)
3213 {
3214         return -ENOSYS;
3215 }
3216
3217 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3218                     void __user *buffer, size_t *lenp, loff_t *ppos)
3219 {
3220         return -ENOSYS;
3221 }
3222
3223 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3224                     void __user *buffer, size_t *lenp, loff_t *ppos)
3225 {
3226         return -ENOSYS;
3227 }
3228
3229 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3230                              void __user *buffer, size_t *lenp, loff_t *ppos)
3231 {
3232         return -ENOSYS;
3233 }
3234
3235 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3236                     void __user *buffer, size_t *lenp, loff_t *ppos)
3237 {
3238         return -ENOSYS;
3239 }
3240
3241 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3242                                       void __user *buffer,
3243                                       size_t *lenp, loff_t *ppos)
3244 {
3245     return -ENOSYS;
3246 }
3247
3248
3249 #endif /* CONFIG_PROC_SYSCTL */
3250
3251 /*
3252  * No sense putting this after each symbol definition, twice,
3253  * exception granted :-)
3254  */
3255 EXPORT_SYMBOL(proc_dointvec);
3256 EXPORT_SYMBOL(proc_douintvec);
3257 EXPORT_SYMBOL(proc_dointvec_jiffies);
3258 EXPORT_SYMBOL(proc_dointvec_minmax);
3259 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3260 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3261 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3262 EXPORT_SYMBOL(proc_dostring);
3263 EXPORT_SYMBOL(proc_doulongvec_minmax);
3264 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);