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
  70 #include <linux/uaccess.h>
  71 #include <asm/processor.h>
  72
  73 #ifdef CONFIG_X86
  74 #include <asm/nmi.h>
  75 #include <asm/stacktrace.h>
  76 #include <asm/io.h>
  77 #endif
  78 #ifdef CONFIG_SPARC
  79 #include <asm/setup.h>
  80 #endif
  81 #ifdef CONFIG_BSD_PROCESS_ACCT
  82 #include <linux/acct.h>
  83 #endif
  84 #ifdef CONFIG_RT_MUTEXES
  85 #include <linux/rtmutex.h>
  86 #endif
  87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  88 #include <linux/lockdep.h>
  89 #endif
  90 #ifdef CONFIG_CHR_DEV_SG
  91 #include <scsi/sg.h>
  92 #endif
  93 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
  94 #include <linux/stackleak.h>
  95 #endif
  96 #ifdef CONFIG_LOCKUP_DETECTOR
  97 #include <linux/nmi.h>
  98 #endif
  99
 100 #if defined(CONFIG_SYSCTL)
 101
 102 /* External variables not in a header file. */
 103 extern int suid_dumpable;
 104 #ifdef CONFIG_COREDUMP
 105 extern int core_uses_pid;
 106 extern char core_pattern[];
 107 extern unsigned int core_pipe_limit;
 108 #endif
 109 extern int pid_max;
 110 extern int pid_max_min, pid_max_max;
 111 extern int percpu_pagelist_fraction;
 112 extern int latencytop_enabled;
 113 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
 114 #ifndef CONFIG_MMU
 115 extern int sysctl_nr_trim_pages;
 116 #endif
 117
 118 /* Constants used for minimum and  maximum */
 119 #ifdef CONFIG_LOCKUP_DETECTOR
 120 static int sixty = 60;
 121 #endif
 122
 123 static int __maybe_unused neg_one = -1;
 124
 125 static int zero;
 126 static int __maybe_unused one = 1;
 127 static int __maybe_unused two = 2;
 128 static int __maybe_unused four = 4;
 129 static unsigned long one_ul = 1;
 130 static int one_hundred = 100;
 131 static int one_thousand = 1000;
 132 #ifdef CONFIG_PRINTK
 133 static int ten_thousand = 10000;
 134 #endif
 135 #ifdef CONFIG_PERF_EVENTS
 136 static int six_hundred_forty_kb = 640 * 1024;
 137 #endif
 138
 139 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 140 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 141
 142 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 143 static int maxolduid = 65535;
 144 static int minolduid;
 145
 146 static int ngroups_max = NGROUPS_MAX;
 147 static const int cap_last_cap = CAP_LAST_CAP;
 148
 149 /*
 150  * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
 151  * and hung_task_check_interval_secs
 152  */
 153 #ifdef CONFIG_DETECT_HUNG_TASK
 154 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 155 #endif
 156
 157 #ifdef CONFIG_INOTIFY_USER
 158 #include <linux/inotify.h>
 159 #endif
 160 #ifdef CONFIG_SPARC
 161 #endif
 162
 163 #ifdef __hppa__
 164 extern int pwrsw_enabled;
 165 #endif
 166
 167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 168 extern int unaligned_enabled;
 169 #endif
 170
 171 #ifdef CONFIG_IA64
 172 extern int unaligned_dump_stack;
 173 #endif
 174
 175 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 176 extern int no_unaligned_warning;
 177 #endif
 178
 179 #ifdef CONFIG_PROC_SYSCTL
 180
 181 /**
 182  * enum sysctl_writes_mode - supported sysctl write modes
 183  *
 184  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 185  *      to be written, and multiple writes on the same sysctl file descriptor
 186  *      will rewrite the sysctl value, regardless of file position. No warning
 187  *      is issued when the initial position is not 0.
 188  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 189  *      not 0.
 190  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 191  *      file position 0 and the value must be fully contained in the buffer
 192  *      sent to the write syscall. If dealing with strings respect the file
 193  *      position, but restrict this to the max length of the buffer, anything
 194  *      passed the max lenght will be ignored. Multiple writes will append
 195  *      to the buffer.
 196  *
 197  * These write modes control how current file position affects the behavior of
 198  * updating sysctl values through the proc interface on each write.
 199  */
 200 enum sysctl_writes_mode {
 201         SYSCTL_WRITES_LEGACY            = -1,
 202         SYSCTL_WRITES_WARN              = 0,
 203         SYSCTL_WRITES_STRICT            = 1,
 204 };
 205
 206 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 207
 208 static int proc_do_cad_pid(struct ctl_table *table, int write,
 209                   void __user *buffer, size_t *lenp, loff_t *ppos);
 210 static int proc_taint(struct ctl_table *table, int write,
 211                                void __user *buffer, size_t *lenp, loff_t *ppos);
 212 #endif
 213
 214 #ifdef CONFIG_PRINTK
 215 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 216                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 217 #endif
 218
 219 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 220                 void __user *buffer, size_t *lenp, loff_t *ppos);
 221 #ifdef CONFIG_COREDUMP
 222 static int proc_dostring_coredump(struct ctl_table *table, int write,
 223                 void __user *buffer, size_t *lenp, loff_t *ppos);
 224 #endif
 225 static int proc_dopipe_max_size(struct ctl_table *table, int write,
 226                 void __user *buffer, size_t *lenp, loff_t *ppos);
 227 #ifdef CONFIG_BPF_SYSCALL
 228 static int proc_dointvec_minmax_bpf_stats(struct ctl_table *table, int write,
 229                                           void __user *buffer, size_t *lenp,
 230                                           loff_t *ppos);
 231 #endif
 232
 233 #ifdef CONFIG_MAGIC_SYSRQ
 234 /* Note: sysrq code uses its own private copy */
 235 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 236
 237 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 238                                 void __user *buffer, size_t *lenp,
 239                                 loff_t *ppos)
 240 {
 241         int error;
 242
 243         error = proc_dointvec(table, write, buffer, lenp, ppos);
 244         if (error)
 245                 return error;
 246
 247         if (write)
 248                 sysrq_toggle_support(__sysrq_enabled);
 249
 250         return 0;
 251 }
 252
 253 #endif
 254
 255 static struct ctl_table kern_table[];
 256 static struct ctl_table vm_table[];
 257 static struct ctl_table fs_table[];
 258 static struct ctl_table debug_table[];
 259 static struct ctl_table dev_table[];
 260 extern struct ctl_table random_table[];
 261 #ifdef CONFIG_EPOLL
 262 extern struct ctl_table epoll_table[];
 263 #endif
 264
 265 #ifdef CONFIG_FW_LOADER_USER_HELPER
 266 extern struct ctl_table firmware_config_table[];
 267 #endif
 268
 269 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 270 int sysctl_legacy_va_layout;
 271 #endif
 272
 273 /* The default sysctl tables: */
 274
 275 static struct ctl_table sysctl_base_table[] = {
 276         {
 277                 .procname       = "kernel",
 278                 .mode           = 0555,
 279                 .child          = kern_table,
 280         },
 281         {
 282                 .procname       = "vm",
 283                 .mode           = 0555,
 284                 .child          = vm_table,
 285         },
 286         {
 287                 .procname       = "fs",
 288                 .mode           = 0555,
 289                 .child          = fs_table,
 290         },
 291         {
 292                 .procname       = "debug",
 293                 .mode           = 0555,
 294                 .child          = debug_table,
 295         },
 296         {
 297                 .procname       = "dev",
 298                 .mode           = 0555,
 299                 .child          = dev_table,
 300         },
 301         { }
 302 };
 303
 304 #ifdef CONFIG_SCHED_DEBUG
 305 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 306 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 307 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 308 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 309 #ifdef CONFIG_SMP
 310 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 311 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 312 #endif /* CONFIG_SMP */
 313 #endif /* CONFIG_SCHED_DEBUG */
 314
 315 #ifdef CONFIG_COMPACTION
 316 static int min_extfrag_threshold;
 317 static int max_extfrag_threshold = 1000;
 318 #endif
 319
 320 static struct ctl_table kern_table[] = {
 321         {
 322                 .procname       = "sched_child_runs_first",
 323                 .data           = &sysctl_sched_child_runs_first,
 324                 .maxlen         = sizeof(unsigned int),
 325                 .mode           = 0644,
 326                 .proc_handler   = proc_dointvec,
 327         },
 328 #ifdef CONFIG_SCHED_DEBUG
 329         {
 330                 .procname       = "sched_min_granularity_ns",
 331                 .data           = &sysctl_sched_min_granularity,
 332                 .maxlen         = sizeof(unsigned int),
 333                 .mode           = 0644,
 334                 .proc_handler   = sched_proc_update_handler,
 335                 .extra1         = &min_sched_granularity_ns,
 336                 .extra2         = &max_sched_granularity_ns,
 337         },
 338         {
 339                 .procname       = "sched_latency_ns",
 340                 .data           = &sysctl_sched_latency,
 341                 .maxlen         = sizeof(unsigned int),
 342                 .mode           = 0644,
 343                 .proc_handler   = sched_proc_update_handler,
 344                 .extra1         = &min_sched_granularity_ns,
 345                 .extra2         = &max_sched_granularity_ns,
 346         },
 347         {
 348                 .procname       = "sched_wakeup_granularity_ns",
 349                 .data           = &sysctl_sched_wakeup_granularity,
 350                 .maxlen         = sizeof(unsigned int),
 351                 .mode           = 0644,
 352                 .proc_handler   = sched_proc_update_handler,
 353                 .extra1         = &min_wakeup_granularity_ns,
 354                 .extra2         = &max_wakeup_granularity_ns,
 355         },
 356 #ifdef CONFIG_SMP
 357         {
 358                 .procname       = "sched_tunable_scaling",
 359                 .data           = &sysctl_sched_tunable_scaling,
 360                 .maxlen         = sizeof(enum sched_tunable_scaling),
 361                 .mode           = 0644,
 362                 .proc_handler   = sched_proc_update_handler,
 363                 .extra1         = &min_sched_tunable_scaling,
 364                 .extra2         = &max_sched_tunable_scaling,
 365         },
 366         {
 367                 .procname       = "sched_migration_cost_ns",
 368                 .data           = &sysctl_sched_migration_cost,
 369                 .maxlen         = sizeof(unsigned int),
 370                 .mode           = 0644,
 371                 .proc_handler   = proc_dointvec,
 372         },
 373         {
 374                 .procname       = "sched_nr_migrate",
 375                 .data           = &sysctl_sched_nr_migrate,
 376                 .maxlen         = sizeof(unsigned int),
 377                 .mode           = 0644,
 378                 .proc_handler   = proc_dointvec,
 379         },
 380 #ifdef CONFIG_SCHEDSTATS
 381         {
 382                 .procname       = "sched_schedstats",
 383                 .data           = NULL,
 384                 .maxlen         = sizeof(unsigned int),
 385                 .mode           = 0644,
 386                 .proc_handler   = sysctl_schedstats,
 387                 .extra1         = &zero,
 388                 .extra2         = &one,
 389         },
 390 #endif /* CONFIG_SCHEDSTATS */
 391 #endif /* CONFIG_SMP */
 392 #ifdef CONFIG_NUMA_BALANCING
 393         {
 394                 .procname       = "numa_balancing_scan_delay_ms",
 395                 .data           = &sysctl_numa_balancing_scan_delay,
 396                 .maxlen         = sizeof(unsigned int),
 397                 .mode           = 0644,
 398                 .proc_handler   = proc_dointvec,
 399         },
 400         {
 401                 .procname       = "numa_balancing_scan_period_min_ms",
 402                 .data           = &sysctl_numa_balancing_scan_period_min,
 403                 .maxlen         = sizeof(unsigned int),
 404                 .mode           = 0644,
 405                 .proc_handler   = proc_dointvec,
 406         },
 407         {
 408                 .procname       = "numa_balancing_scan_period_max_ms",
 409                 .data           = &sysctl_numa_balancing_scan_period_max,
 410                 .maxlen         = sizeof(unsigned int),
 411                 .mode           = 0644,
 412                 .proc_handler   = proc_dointvec,
 413         },
 414         {
 415                 .procname       = "numa_balancing_scan_size_mb",
 416                 .data           = &sysctl_numa_balancing_scan_size,
 417                 .maxlen         = sizeof(unsigned int),
 418                 .mode           = 0644,
 419                 .proc_handler   = proc_dointvec_minmax,
 420                 .extra1         = &one,
 421         },
 422         {
 423                 .procname       = "numa_balancing",
 424                 .data           = NULL, /* filled in by handler */
 425                 .maxlen         = sizeof(unsigned int),
 426                 .mode           = 0644,
 427                 .proc_handler   = sysctl_numa_balancing,
 428                 .extra1         = &zero,
 429                 .extra2         = &one,
 430         },
 431 #endif /* CONFIG_NUMA_BALANCING */
 432 #endif /* CONFIG_SCHED_DEBUG */
 433         {
 434                 .procname       = "sched_rt_period_us",
 435                 .data           = &sysctl_sched_rt_period,
 436                 .maxlen         = sizeof(unsigned int),
 437                 .mode           = 0644,
 438                 .proc_handler   = sched_rt_handler,
 439         },
 440         {
 441                 .procname       = "sched_rt_runtime_us",
 442                 .data           = &sysctl_sched_rt_runtime,
 443                 .maxlen         = sizeof(int),
 444                 .mode           = 0644,
 445                 .proc_handler   = sched_rt_handler,
 446         },
 447         {
 448                 .procname       = "sched_rr_timeslice_ms",
 449                 .data           = &sysctl_sched_rr_timeslice,
 450                 .maxlen         = sizeof(int),
 451                 .mode           = 0644,
 452                 .proc_handler   = sched_rr_handler,
 453         },
 454 #ifdef CONFIG_SCHED_AUTOGROUP
 455         {
 456                 .procname       = "sched_autogroup_enabled",
 457                 .data           = &sysctl_sched_autogroup_enabled,
 458                 .maxlen         = sizeof(unsigned int),
 459                 .mode           = 0644,
 460                 .proc_handler   = proc_dointvec_minmax,
 461                 .extra1         = &zero,
 462                 .extra2         = &one,
 463         },
 464 #endif
 465 #ifdef CONFIG_CFS_BANDWIDTH
 466         {
 467                 .procname       = "sched_cfs_bandwidth_slice_us",
 468                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 469                 .maxlen         = sizeof(unsigned int),
 470                 .mode           = 0644,
 471                 .proc_handler   = proc_dointvec_minmax,
 472                 .extra1         = &one,
 473         },
 474 #endif
 475 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
 476         {
 477                 .procname       = "sched_energy_aware",
 478                 .data           = &sysctl_sched_energy_aware,
 479                 .maxlen         = sizeof(unsigned int),
 480                 .mode           = 0644,
 481                 .proc_handler   = sched_energy_aware_handler,
 482                 .extra1         = &zero,
 483                 .extra2         = &one,
 484         },
 485 #endif
 486 #ifdef CONFIG_PROVE_LOCKING
 487         {
 488                 .procname       = "prove_locking",
 489                 .data           = &prove_locking,
 490                 .maxlen         = sizeof(int),
 491                 .mode           = 0644,
 492                 .proc_handler   = proc_dointvec,
 493         },
 494 #endif
 495 #ifdef CONFIG_LOCK_STAT
 496         {
 497                 .procname       = "lock_stat",
 498                 .data           = &lock_stat,
 499                 .maxlen         = sizeof(int),
 500                 .mode           = 0644,
 501                 .proc_handler   = proc_dointvec,
 502         },
 503 #endif
 504         {
 505                 .procname       = "panic",
 506                 .data           = &panic_timeout,
 507                 .maxlen         = sizeof(int),
 508                 .mode           = 0644,
 509                 .proc_handler   = proc_dointvec,
 510         },
 511 #ifdef CONFIG_COREDUMP
 512         {
 513                 .procname       = "core_uses_pid",
 514                 .data           = &core_uses_pid,
 515                 .maxlen         = sizeof(int),
 516                 .mode           = 0644,
 517                 .proc_handler   = proc_dointvec,
 518         },
 519         {
 520                 .procname       = "core_pattern",
 521                 .data           = core_pattern,
 522                 .maxlen         = CORENAME_MAX_SIZE,
 523                 .mode           = 0644,
 524                 .proc_handler   = proc_dostring_coredump,
 525         },
 526         {
 527                 .procname       = "core_pipe_limit",
 528                 .data           = &core_pipe_limit,
 529                 .maxlen         = sizeof(unsigned int),
 530                 .mode           = 0644,
 531                 .proc_handler   = proc_dointvec,
 532         },
 533 #endif
 534 #ifdef CONFIG_PROC_SYSCTL
 535         {
 536                 .procname       = "tainted",
 537                 .maxlen         = sizeof(long),
 538                 .mode           = 0644,
 539                 .proc_handler   = proc_taint,
 540         },
 541         {
 542                 .procname       = "sysctl_writes_strict",
 543                 .data           = &sysctl_writes_strict,
 544                 .maxlen         = sizeof(int),
 545                 .mode           = 0644,
 546                 .proc_handler   = proc_dointvec_minmax,
 547                 .extra1         = &neg_one,
 548                 .extra2         = &one,
 549         },
 550 #endif
 551 #ifdef CONFIG_LATENCYTOP
 552         {
 553                 .procname       = "latencytop",
 554                 .data           = &latencytop_enabled,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = sysctl_latencytop,
 558         },
 559 #endif
 560 #ifdef CONFIG_BLK_DEV_INITRD
 561         {
 562                 .procname       = "real-root-dev",
 563                 .data           = &real_root_dev,
 564                 .maxlen         = sizeof(int),
 565                 .mode           = 0644,
 566                 .proc_handler   = proc_dointvec,
 567         },
 568 #endif
 569         {
 570                 .procname       = "print-fatal-signals",
 571                 .data           = &print_fatal_signals,
 572                 .maxlen         = sizeof(int),
 573                 .mode           = 0644,
 574                 .proc_handler   = proc_dointvec,
 575         },
 576 #ifdef CONFIG_SPARC
 577         {
 578                 .procname       = "reboot-cmd",
 579                 .data           = reboot_command,
 580                 .maxlen         = 256,
 581                 .mode           = 0644,
 582                 .proc_handler   = proc_dostring,
 583         },
 584         {
 585                 .procname       = "stop-a",
 586                 .data           = &stop_a_enabled,
 587                 .maxlen         = sizeof (int),
 588                 .mode           = 0644,
 589                 .proc_handler   = proc_dointvec,
 590         },
 591         {
 592                 .procname       = "scons-poweroff",
 593                 .data           = &scons_pwroff,
 594                 .maxlen         = sizeof (int),
 595                 .mode           = 0644,
 596                 .proc_handler   = proc_dointvec,
 597         },
 598 #endif
 599 #ifdef CONFIG_SPARC64
 600         {
 601                 .procname       = "tsb-ratio",
 602                 .data           = &sysctl_tsb_ratio,
 603                 .maxlen         = sizeof (int),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dointvec,
 606         },
 607 #endif
 608 #ifdef __hppa__
 609         {
 610                 .procname       = "soft-power",
 611                 .data           = &pwrsw_enabled,
 612                 .maxlen         = sizeof (int),
 613                 .mode           = 0644,
 614                 .proc_handler   = proc_dointvec,
 615         },
 616 #endif
 617 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 618         {
 619                 .procname       = "unaligned-trap",
 620                 .data           = &unaligned_enabled,
 621                 .maxlen         = sizeof (int),
 622                 .mode           = 0644,
 623                 .proc_handler   = proc_dointvec,
 624         },
 625 #endif
 626         {
 627                 .procname       = "ctrl-alt-del",
 628                 .data           = &C_A_D,
 629                 .maxlen         = sizeof(int),
 630                 .mode           = 0644,
 631                 .proc_handler   = proc_dointvec,
 632         },
 633 #ifdef CONFIG_FUNCTION_TRACER
 634         {
 635                 .procname       = "ftrace_enabled",
 636                 .data           = &ftrace_enabled,
 637                 .maxlen         = sizeof(int),
 638                 .mode           = 0644,
 639                 .proc_handler   = ftrace_enable_sysctl,
 640         },
 641 #endif
 642 #ifdef CONFIG_STACK_TRACER
 643         {
 644                 .procname       = "stack_tracer_enabled",
 645                 .data           = &stack_tracer_enabled,
 646                 .maxlen         = sizeof(int),
 647                 .mode           = 0644,
 648                 .proc_handler   = stack_trace_sysctl,
 649         },
 650 #endif
 651 #ifdef CONFIG_TRACING
 652         {
 653                 .procname       = "ftrace_dump_on_oops",
 654                 .data           = &ftrace_dump_on_oops,
 655                 .maxlen         = sizeof(int),
 656                 .mode           = 0644,
 657                 .proc_handler   = proc_dointvec,
 658         },
 659         {
 660                 .procname       = "traceoff_on_warning",
 661                 .data           = &__disable_trace_on_warning,
 662                 .maxlen         = sizeof(__disable_trace_on_warning),
 663                 .mode           = 0644,
 664                 .proc_handler   = proc_dointvec,
 665         },
 666         {
 667                 .procname       = "tracepoint_printk",
 668                 .data           = &tracepoint_printk,
 669                 .maxlen         = sizeof(tracepoint_printk),
 670                 .mode           = 0644,
 671                 .proc_handler   = tracepoint_printk_sysctl,
 672         },
 673 #endif
 674 #ifdef CONFIG_KEXEC_CORE
 675         {
 676                 .procname       = "kexec_load_disabled",
 677                 .data           = &kexec_load_disabled,
 678                 .maxlen         = sizeof(int),
 679                 .mode           = 0644,
 680                 /* only handle a transition from default "0" to "1" */
 681                 .proc_handler   = proc_dointvec_minmax,
 682                 .extra1         = &one,
 683                 .extra2         = &one,
 684         },
 685 #endif
 686 #ifdef CONFIG_MODULES
 687         {
 688                 .procname       = "modprobe",
 689                 .data           = &modprobe_path,
 690                 .maxlen         = KMOD_PATH_LEN,
 691                 .mode           = 0644,
 692                 .proc_handler   = proc_dostring,
 693         },
 694         {
 695                 .procname       = "modules_disabled",
 696                 .data           = &modules_disabled,
 697                 .maxlen         = sizeof(int),
 698                 .mode           = 0644,
 699                 /* only handle a transition from default "0" to "1" */
 700                 .proc_handler   = proc_dointvec_minmax,
 701                 .extra1         = &one,
 702                 .extra2         = &one,
 703         },
 704 #endif
 705 #ifdef CONFIG_UEVENT_HELPER
 706         {
 707                 .procname       = "hotplug",
 708                 .data           = &uevent_helper,
 709                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 710                 .mode           = 0644,
 711                 .proc_handler   = proc_dostring,
 712         },
 713 #endif
 714 #ifdef CONFIG_CHR_DEV_SG
 715         {
 716                 .procname       = "sg-big-buff",
 717                 .data           = &sg_big_buff,
 718                 .maxlen         = sizeof (int),
 719                 .mode           = 0444,
 720                 .proc_handler   = proc_dointvec,
 721         },
 722 #endif
 723 #ifdef CONFIG_BSD_PROCESS_ACCT
 724         {
 725                 .procname       = "acct",
 726                 .data           = &acct_parm,
 727                 .maxlen         = 3*sizeof(int),
 728                 .mode           = 0644,
 729                 .proc_handler   = proc_dointvec,
 730         },
 731 #endif
 732 #ifdef CONFIG_MAGIC_SYSRQ
 733         {
 734                 .procname       = "sysrq",
 735                 .data           = &__sysrq_enabled,
 736                 .maxlen         = sizeof (int),
 737                 .mode           = 0644,
 738                 .proc_handler   = sysrq_sysctl_handler,
 739         },
 740 #endif
 741 #ifdef CONFIG_PROC_SYSCTL
 742         {
 743                 .procname       = "cad_pid",
 744                 .data           = NULL,
 745                 .maxlen         = sizeof (int),
 746                 .mode           = 0600,
 747                 .proc_handler   = proc_do_cad_pid,
 748         },
 749 #endif
 750         {
 751                 .procname       = "threads-max",
 752                 .data           = NULL,
 753                 .maxlen         = sizeof(int),
 754                 .mode           = 0644,
 755                 .proc_handler   = sysctl_max_threads,
 756         },
 757         {
 758                 .procname       = "random",
 759                 .mode           = 0555,
 760                 .child          = random_table,
 761         },
 762         {
 763                 .procname       = "usermodehelper",
 764                 .mode           = 0555,
 765                 .child          = usermodehelper_table,
 766         },
 767 #ifdef CONFIG_FW_LOADER_USER_HELPER
 768         {
 769                 .procname       = "firmware_config",
 770                 .mode           = 0555,
 771                 .child          = firmware_config_table,
 772         },
 773 #endif
 774         {
 775                 .procname       = "overflowuid",
 776                 .data           = &overflowuid,
 777                 .maxlen         = sizeof(int),
 778                 .mode           = 0644,
 779                 .proc_handler   = proc_dointvec_minmax,
 780                 .extra1         = &minolduid,
 781                 .extra2         = &maxolduid,
 782         },
 783         {
 784                 .procname       = "overflowgid",
 785                 .data           = &overflowgid,
 786                 .maxlen         = sizeof(int),
 787                 .mode           = 0644,
 788                 .proc_handler   = proc_dointvec_minmax,
 789                 .extra1         = &minolduid,
 790                 .extra2         = &maxolduid,
 791         },
 792 #ifdef CONFIG_S390
 793 #ifdef CONFIG_MATHEMU
 794         {
 795                 .procname       = "ieee_emulation_warnings",
 796                 .data           = &sysctl_ieee_emulation_warnings,
 797                 .maxlen         = sizeof(int),
 798                 .mode           = 0644,
 799                 .proc_handler   = proc_dointvec,
 800         },
 801 #endif
 802         {
 803                 .procname       = "userprocess_debug",
 804                 .data           = &show_unhandled_signals,
 805                 .maxlen         = sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = proc_dointvec,
 808         },
 809 #endif
 810         {
 811                 .procname       = "pid_max",
 812                 .data           = &pid_max,
 813                 .maxlen         = sizeof (int),
 814                 .mode           = 0644,
 815                 .proc_handler   = proc_dointvec_minmax,
 816                 .extra1         = &pid_max_min,
 817                 .extra2         = &pid_max_max,
 818         },
 819         {
 820                 .procname       = "panic_on_oops",
 821                 .data           = &panic_on_oops,
 822                 .maxlen         = sizeof(int),
 823                 .mode           = 0644,
 824                 .proc_handler   = proc_dointvec,
 825         },
 826         {
 827                 .procname       = "panic_print",
 828                 .data           = &panic_print,
 829                 .maxlen         = sizeof(unsigned long),
 830                 .mode           = 0644,
 831                 .proc_handler   = proc_doulongvec_minmax,
 832         },
 833 #if defined CONFIG_PRINTK
 834         {
 835                 .procname       = "printk",
 836                 .data           = &console_loglevel,
 837                 .maxlen         = 4*sizeof(int),
 838                 .mode           = 0644,
 839                 .proc_handler   = proc_dointvec,
 840         },
 841         {
 842                 .procname       = "printk_ratelimit",
 843                 .data           = &printk_ratelimit_state.interval,
 844                 .maxlen         = sizeof(int),
 845                 .mode           = 0644,
 846                 .proc_handler   = proc_dointvec_jiffies,
 847         },
 848         {
 849                 .procname       = "printk_ratelimit_burst",
 850                 .data           = &printk_ratelimit_state.burst,
 851                 .maxlen         = sizeof(int),
 852                 .mode           = 0644,
 853                 .proc_handler   = proc_dointvec,
 854         },
 855         {
 856                 .procname       = "printk_delay",
 857                 .data           = &printk_delay_msec,
 858                 .maxlen         = sizeof(int),
 859                 .mode           = 0644,
 860                 .proc_handler   = proc_dointvec_minmax,
 861                 .extra1         = &zero,
 862                 .extra2         = &ten_thousand,
 863         },
 864         {
 865                 .procname       = "printk_devkmsg",
 866                 .data           = devkmsg_log_str,
 867                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
 868                 .mode           = 0644,
 869                 .proc_handler   = devkmsg_sysctl_set_loglvl,
 870         },
 871         {
 872                 .procname       = "dmesg_restrict",
 873                 .data           = &dmesg_restrict,
 874                 .maxlen         = sizeof(int),
 875                 .mode           = 0644,
 876                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 877                 .extra1         = &zero,
 878                 .extra2         = &one,
 879         },
 880         {
 881                 .procname       = "kptr_restrict",
 882                 .data           = &kptr_restrict,
 883                 .maxlen         = sizeof(int),
 884                 .mode           = 0644,
 885                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 886                 .extra1         = &zero,
 887                 .extra2         = &two,
 888         },
 889 #endif
 890         {
 891                 .procname       = "ngroups_max",
 892                 .data           = &ngroups_max,
 893                 .maxlen         = sizeof (int),
 894                 .mode           = 0444,
 895                 .proc_handler   = proc_dointvec,
 896         },
 897         {
 898                 .procname       = "cap_last_cap",
 899                 .data           = (void *)&cap_last_cap,
 900                 .maxlen         = sizeof(int),
 901                 .mode           = 0444,
 902                 .proc_handler   = proc_dointvec,
 903         },
 904 #if defined(CONFIG_LOCKUP_DETECTOR)
 905         {
 906                 .procname       = "watchdog",
 907                 .data           = &watchdog_user_enabled,
 908                 .maxlen         = sizeof(int),
 909                 .mode           = 0644,
 910                 .proc_handler   = proc_watchdog,
 911                 .extra1         = &zero,
 912                 .extra2         = &one,
 913         },
 914         {
 915                 .procname       = "watchdog_thresh",
 916                 .data           = &watchdog_thresh,
 917                 .maxlen         = sizeof(int),
 918                 .mode           = 0644,
 919                 .proc_handler   = proc_watchdog_thresh,
 920                 .extra1         = &zero,
 921                 .extra2         = &sixty,
 922         },
 923         {
 924                 .procname       = "nmi_watchdog",
 925                 .data           = &nmi_watchdog_user_enabled,
 926                 .maxlen         = sizeof(int),
 927                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
 928                 .proc_handler   = proc_nmi_watchdog,
 929                 .extra1         = &zero,
 930                 .extra2         = &one,
 931         },
 932         {
 933                 .procname       = "watchdog_cpumask",
 934                 .data           = &watchdog_cpumask_bits,
 935                 .maxlen         = NR_CPUS,
 936                 .mode           = 0644,
 937                 .proc_handler   = proc_watchdog_cpumask,
 938         },
 939 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
 940         {
 941                 .procname       = "soft_watchdog",
 942                 .data           = &soft_watchdog_user_enabled,
 943                 .maxlen         = sizeof(int),
 944                 .mode           = 0644,
 945                 .proc_handler   = proc_soft_watchdog,
 946                 .extra1         = &zero,
 947                 .extra2         = &one,
 948         },
 949         {
 950                 .procname       = "softlockup_panic",
 951                 .data           = &softlockup_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       = "softlockup_all_cpu_backtrace",
 961                 .data           = &sysctl_softlockup_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 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 971         {
 972                 .procname       = "hardlockup_panic",
 973                 .data           = &hardlockup_panic,
 974                 .maxlen         = sizeof(int),
 975                 .mode           = 0644,
 976                 .proc_handler   = proc_dointvec_minmax,
 977                 .extra1         = &zero,
 978                 .extra2         = &one,
 979         },
 980 #ifdef CONFIG_SMP
 981         {
 982                 .procname       = "hardlockup_all_cpu_backtrace",
 983                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
 984                 .maxlen         = sizeof(int),
 985                 .mode           = 0644,
 986                 .proc_handler   = proc_dointvec_minmax,
 987                 .extra1         = &zero,
 988                 .extra2         = &one,
 989         },
 990 #endif /* CONFIG_SMP */
 991 #endif
 992 #endif
 993
 994 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 995         {
 996                 .procname       = "unknown_nmi_panic",
 997                 .data           = &unknown_nmi_panic,
 998                 .maxlen         = sizeof (int),
 999                 .mode           = 0644,
1000                 .proc_handler   = proc_dointvec,
1001         },
1002 #endif
1003 #if defined(CONFIG_X86)
1004         {
1005                 .procname       = "panic_on_unrecovered_nmi",
1006                 .data           = &panic_on_unrecovered_nmi,
1007                 .maxlen         = sizeof(int),
1008                 .mode           = 0644,
1009                 .proc_handler   = proc_dointvec,
1010         },
1011         {
1012                 .procname       = "panic_on_io_nmi",
1013                 .data           = &panic_on_io_nmi,
1014                 .maxlen         = sizeof(int),
1015                 .mode           = 0644,
1016                 .proc_handler   = proc_dointvec,
1017         },
1018 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1019         {
1020                 .procname       = "panic_on_stackoverflow",
1021                 .data           = &sysctl_panic_on_stackoverflow,
1022                 .maxlen         = sizeof(int),
1023                 .mode           = 0644,
1024                 .proc_handler   = proc_dointvec,
1025         },
1026 #endif
1027         {
1028                 .procname       = "bootloader_type",
1029                 .data           = &bootloader_type,
1030                 .maxlen         = sizeof (int),
1031                 .mode           = 0444,
1032                 .proc_handler   = proc_dointvec,
1033         },
1034         {
1035                 .procname       = "bootloader_version",
1036                 .data           = &bootloader_version,
1037                 .maxlen         = sizeof (int),
1038                 .mode           = 0444,
1039                 .proc_handler   = proc_dointvec,
1040         },
1041         {
1042                 .procname       = "io_delay_type",
1043                 .data           = &io_delay_type,
1044                 .maxlen         = sizeof(int),
1045                 .mode           = 0644,
1046                 .proc_handler   = proc_dointvec,
1047         },
1048 #endif
1049 #if defined(CONFIG_MMU)
1050         {
1051                 .procname       = "randomize_va_space",
1052                 .data           = &randomize_va_space,
1053                 .maxlen         = sizeof(int),
1054                 .mode           = 0644,
1055                 .proc_handler   = proc_dointvec,
1056         },
1057 #endif
1058 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1059         {
1060                 .procname       = "spin_retry",
1061                 .data           = &spin_retry,
1062                 .maxlen         = sizeof (int),
1063                 .mode           = 0644,
1064                 .proc_handler   = proc_dointvec,
1065         },
1066 #endif
1067 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1068         {
1069                 .procname       = "acpi_video_flags",
1070                 .data           = &acpi_realmode_flags,
1071                 .maxlen         = sizeof (unsigned long),
1072                 .mode           = 0644,
1073                 .proc_handler   = proc_doulongvec_minmax,
1074         },
1075 #endif
1076 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1077         {
1078                 .procname       = "ignore-unaligned-usertrap",
1079                 .data           = &no_unaligned_warning,
1080                 .maxlen         = sizeof (int),
1081                 .mode           = 0644,
1082                 .proc_handler   = proc_dointvec,
1083         },
1084 #endif
1085 #ifdef CONFIG_IA64
1086         {
1087                 .procname       = "unaligned-dump-stack",
1088                 .data           = &unaligned_dump_stack,
1089                 .maxlen         = sizeof (int),
1090                 .mode           = 0644,
1091                 .proc_handler   = proc_dointvec,
1092         },
1093 #endif
1094 #ifdef CONFIG_DETECT_HUNG_TASK
1095         {
1096                 .procname       = "hung_task_panic",
1097                 .data           = &sysctl_hung_task_panic,
1098                 .maxlen         = sizeof(int),
1099                 .mode           = 0644,
1100                 .proc_handler   = proc_dointvec_minmax,
1101                 .extra1         = &zero,
1102                 .extra2         = &one,
1103         },
1104         {
1105                 .procname       = "hung_task_check_count",
1106                 .data           = &sysctl_hung_task_check_count,
1107                 .maxlen         = sizeof(int),
1108                 .mode           = 0644,
1109                 .proc_handler   = proc_dointvec_minmax,
1110                 .extra1         = &zero,
1111         },
1112         {
1113                 .procname       = "hung_task_timeout_secs",
1114                 .data           = &sysctl_hung_task_timeout_secs,
1115                 .maxlen         = sizeof(unsigned long),
1116                 .mode           = 0644,
1117                 .proc_handler   = proc_dohung_task_timeout_secs,
1118                 .extra2         = &hung_task_timeout_max,
1119         },
1120         {
1121                 .procname       = "hung_task_check_interval_secs",
1122                 .data           = &sysctl_hung_task_check_interval_secs,
1123                 .maxlen         = sizeof(unsigned long),
1124                 .mode           = 0644,
1125                 .proc_handler   = proc_dohung_task_timeout_secs,
1126                 .extra2         = &hung_task_timeout_max,
1127         },
1128         {
1129                 .procname       = "hung_task_warnings",
1130                 .data           = &sysctl_hung_task_warnings,
1131                 .maxlen         = sizeof(int),
1132                 .mode           = 0644,
1133                 .proc_handler   = proc_dointvec_minmax,
1134                 .extra1         = &neg_one,
1135         },
1136 #endif
1137 #ifdef CONFIG_RT_MUTEXES
1138         {
1139                 .procname       = "max_lock_depth",
1140                 .data           = &max_lock_depth,
1141                 .maxlen         = sizeof(int),
1142                 .mode           = 0644,
1143                 .proc_handler   = proc_dointvec,
1144         },
1145 #endif
1146         {
1147                 .procname       = "poweroff_cmd",
1148                 .data           = &poweroff_cmd,
1149                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dostring,
1152         },
1153 #ifdef CONFIG_KEYS
1154         {
1155                 .procname       = "keys",
1156                 .mode           = 0555,
1157                 .child          = key_sysctls,
1158         },
1159 #endif
1160 #ifdef CONFIG_PERF_EVENTS
1161         /*
1162          * User-space scripts rely on the existence of this file
1163          * as a feature check for perf_events being enabled.
1164          *
1165          * So it's an ABI, do not remove!
1166          */
1167         {
1168                 .procname       = "perf_event_paranoid",
1169                 .data           = &sysctl_perf_event_paranoid,
1170                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1171                 .mode           = 0644,
1172                 .proc_handler   = proc_dointvec,
1173         },
1174         {
1175                 .procname       = "perf_event_mlock_kb",
1176                 .data           = &sysctl_perf_event_mlock,
1177                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1178                 .mode           = 0644,
1179                 .proc_handler   = proc_dointvec,
1180         },
1181         {
1182                 .procname       = "perf_event_max_sample_rate",
1183                 .data           = &sysctl_perf_event_sample_rate,
1184                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1185                 .mode           = 0644,
1186                 .proc_handler   = perf_proc_update_handler,
1187                 .extra1         = &one,
1188         },
1189         {
1190                 .procname       = "perf_cpu_time_max_percent",
1191                 .data           = &sysctl_perf_cpu_time_max_percent,
1192                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1193                 .mode           = 0644,
1194                 .proc_handler   = perf_cpu_time_max_percent_handler,
1195                 .extra1         = &zero,
1196                 .extra2         = &one_hundred,
1197         },
1198         {
1199                 .procname       = "perf_event_max_stack",
1200                 .data           = &sysctl_perf_event_max_stack,
1201                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
1202                 .mode           = 0644,
1203                 .proc_handler   = perf_event_max_stack_handler,
1204                 .extra1         = &zero,
1205                 .extra2         = &six_hundred_forty_kb,
1206         },
1207         {
1208                 .procname       = "perf_event_max_contexts_per_stack",
1209                 .data           = &sysctl_perf_event_max_contexts_per_stack,
1210                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
1211                 .mode           = 0644,
1212                 .proc_handler   = perf_event_max_stack_handler,
1213                 .extra1         = &zero,
1214                 .extra2         = &one_thousand,
1215         },
1216 #endif
1217         {
1218                 .procname       = "panic_on_warn",
1219                 .data           = &panic_on_warn,
1220                 .maxlen         = sizeof(int),
1221                 .mode           = 0644,
1222                 .proc_handler   = proc_dointvec_minmax,
1223                 .extra1         = &zero,
1224                 .extra2         = &one,
1225         },
1226 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1227         {
1228                 .procname       = "timer_migration",
1229                 .data           = &sysctl_timer_migration,
1230                 .maxlen         = sizeof(unsigned int),
1231                 .mode           = 0644,
1232                 .proc_handler   = timer_migration_handler,
1233                 .extra1         = &zero,
1234                 .extra2         = &one,
1235         },
1236 #endif
1237 #ifdef CONFIG_BPF_SYSCALL
1238         {
1239                 .procname       = "unprivileged_bpf_disabled",
1240                 .data           = &sysctl_unprivileged_bpf_disabled,
1241                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
1242                 .mode           = 0644,
1243                 /* only handle a transition from default "0" to "1" */
1244                 .proc_handler   = proc_dointvec_minmax,
1245                 .extra1         = &one,
1246                 .extra2         = &one,
1247         },
1248         {
1249                 .procname       = "bpf_stats_enabled",
1250                 .data           = &sysctl_bpf_stats_enabled,
1251                 .maxlen         = sizeof(sysctl_bpf_stats_enabled),
1252                 .mode           = 0644,
1253                 .proc_handler   = proc_dointvec_minmax_bpf_stats,
1254                 .extra1         = &zero,
1255                 .extra2         = &one,
1256         },
1257 #endif
1258 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1259         {
1260                 .procname       = "panic_on_rcu_stall",
1261                 .data           = &sysctl_panic_on_rcu_stall,
1262                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
1263                 .mode           = 0644,
1264                 .proc_handler   = proc_dointvec_minmax,
1265                 .extra1         = &zero,
1266                 .extra2         = &one,
1267         },
1268 #endif
1269 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1270         {
1271                 .procname       = "stack_erasing",
1272                 .data           = NULL,
1273                 .maxlen         = sizeof(int),
1274                 .mode           = 0600,
1275                 .proc_handler   = stack_erasing_sysctl,
1276                 .extra1         = &zero,
1277                 .extra2         = &one,
1278         },
1279 #endif
1280         { }
1281 };
1282
1283 static struct ctl_table vm_table[] = {
1284         {
1285                 .procname       = "overcommit_memory",
1286                 .data           = &sysctl_overcommit_memory,
1287                 .maxlen         = sizeof(sysctl_overcommit_memory),
1288                 .mode           = 0644,
1289                 .proc_handler   = proc_dointvec_minmax,
1290                 .extra1         = &zero,
1291                 .extra2         = &two,
1292         },
1293         {
1294                 .procname       = "panic_on_oom",
1295                 .data           = &sysctl_panic_on_oom,
1296                 .maxlen         = sizeof(sysctl_panic_on_oom),
1297                 .mode           = 0644,
1298                 .proc_handler   = proc_dointvec_minmax,
1299                 .extra1         = &zero,
1300                 .extra2         = &two,
1301         },
1302         {
1303                 .procname       = "oom_kill_allocating_task",
1304                 .data           = &sysctl_oom_kill_allocating_task,
1305                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1306                 .mode           = 0644,
1307                 .proc_handler   = proc_dointvec,
1308         },
1309         {
1310                 .procname       = "oom_dump_tasks",
1311                 .data           = &sysctl_oom_dump_tasks,
1312                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1313                 .mode           = 0644,
1314                 .proc_handler   = proc_dointvec,
1315         },
1316         {
1317                 .procname       = "overcommit_ratio",
1318                 .data           = &sysctl_overcommit_ratio,
1319                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1320                 .mode           = 0644,
1321                 .proc_handler   = overcommit_ratio_handler,
1322         },
1323         {
1324                 .procname       = "overcommit_kbytes",
1325                 .data           = &sysctl_overcommit_kbytes,
1326                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1327                 .mode           = 0644,
1328                 .proc_handler   = overcommit_kbytes_handler,
1329         },
1330         {
1331                 .procname       = "page-cluster",
1332                 .data           = &page_cluster,
1333                 .maxlen         = sizeof(int),
1334                 .mode           = 0644,
1335                 .proc_handler   = proc_dointvec_minmax,
1336                 .extra1         = &zero,
1337         },
1338         {
1339                 .procname       = "dirty_background_ratio",
1340                 .data           = &dirty_background_ratio,
1341                 .maxlen         = sizeof(dirty_background_ratio),
1342                 .mode           = 0644,
1343                 .proc_handler   = dirty_background_ratio_handler,
1344                 .extra1         = &zero,
1345                 .extra2         = &one_hundred,
1346         },
1347         {
1348                 .procname       = "dirty_background_bytes",
1349                 .data           = &dirty_background_bytes,
1350                 .maxlen         = sizeof(dirty_background_bytes),
1351                 .mode           = 0644,
1352                 .proc_handler   = dirty_background_bytes_handler,
1353                 .extra1         = &one_ul,
1354         },
1355         {
1356                 .procname       = "dirty_ratio",
1357                 .data           = &vm_dirty_ratio,
1358                 .maxlen         = sizeof(vm_dirty_ratio),
1359                 .mode           = 0644,
1360                 .proc_handler   = dirty_ratio_handler,
1361                 .extra1         = &zero,
1362                 .extra2         = &one_hundred,
1363         },
1364         {
1365                 .procname       = "dirty_bytes",
1366                 .data           = &vm_dirty_bytes,
1367                 .maxlen         = sizeof(vm_dirty_bytes),
1368                 .mode           = 0644,
1369                 .proc_handler   = dirty_bytes_handler,
1370                 .extra1         = &dirty_bytes_min,
1371         },
1372         {
1373                 .procname       = "dirty_writeback_centisecs",
1374                 .data           = &dirty_writeback_interval,
1375                 .maxlen         = sizeof(dirty_writeback_interval),
1376                 .mode           = 0644,
1377                 .proc_handler   = dirty_writeback_centisecs_handler,
1378         },
1379         {
1380                 .procname       = "dirty_expire_centisecs",
1381                 .data           = &dirty_expire_interval,
1382                 .maxlen         = sizeof(dirty_expire_interval),
1383                 .mode           = 0644,
1384                 .proc_handler   = proc_dointvec_minmax,
1385                 .extra1         = &zero,
1386         },
1387         {
1388                 .procname       = "dirtytime_expire_seconds",
1389                 .data           = &dirtytime_expire_interval,
1390                 .maxlen         = sizeof(dirtytime_expire_interval),
1391                 .mode           = 0644,
1392                 .proc_handler   = dirtytime_interval_handler,
1393                 .extra1         = &zero,
1394         },
1395         {
1396                 .procname       = "swappiness",
1397                 .data           = &vm_swappiness,
1398                 .maxlen         = sizeof(vm_swappiness),
1399                 .mode           = 0644,
1400                 .proc_handler   = proc_dointvec_minmax,
1401                 .extra1         = &zero,
1402                 .extra2         = &one_hundred,
1403         },
1404 #ifdef CONFIG_HUGETLB_PAGE
1405         {
1406                 .procname       = "nr_hugepages",
1407                 .data           = NULL,
1408                 .maxlen         = sizeof(unsigned long),
1409                 .mode           = 0644,
1410                 .proc_handler   = hugetlb_sysctl_handler,
1411         },
1412 #ifdef CONFIG_NUMA
1413         {
1414                 .procname       = "nr_hugepages_mempolicy",
1415                 .data           = NULL,
1416                 .maxlen         = sizeof(unsigned long),
1417                 .mode           = 0644,
1418                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1419         },
1420         {
1421                 .procname               = "numa_stat",
1422                 .data                   = &sysctl_vm_numa_stat,
1423                 .maxlen                 = sizeof(int),
1424                 .mode                   = 0644,
1425                 .proc_handler   = sysctl_vm_numa_stat_handler,
1426                 .extra1                 = &zero,
1427                 .extra2                 = &one,
1428         },
1429 #endif
1430          {
1431                 .procname       = "hugetlb_shm_group",
1432                 .data           = &sysctl_hugetlb_shm_group,
1433                 .maxlen         = sizeof(gid_t),
1434                 .mode           = 0644,
1435                 .proc_handler   = proc_dointvec,
1436          },
1437         {
1438                 .procname       = "nr_overcommit_hugepages",
1439                 .data           = NULL,
1440                 .maxlen         = sizeof(unsigned long),
1441                 .mode           = 0644,
1442                 .proc_handler   = hugetlb_overcommit_handler,
1443         },
1444 #endif
1445         {
1446                 .procname       = "lowmem_reserve_ratio",
1447                 .data           = &sysctl_lowmem_reserve_ratio,
1448                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1449                 .mode           = 0644,
1450                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1451         },
1452         {
1453                 .procname       = "drop_caches",
1454                 .data           = &sysctl_drop_caches,
1455                 .maxlen         = sizeof(int),
1456                 .mode           = 0644,
1457                 .proc_handler   = drop_caches_sysctl_handler,
1458                 .extra1         = &one,
1459                 .extra2         = &four,
1460         },
1461 #ifdef CONFIG_COMPACTION
1462         {
1463                 .procname       = "compact_memory",
1464                 .data           = &sysctl_compact_memory,
1465                 .maxlen         = sizeof(int),
1466                 .mode           = 0200,
1467                 .proc_handler   = sysctl_compaction_handler,
1468         },
1469         {
1470                 .procname       = "extfrag_threshold",
1471                 .data           = &sysctl_extfrag_threshold,
1472                 .maxlen         = sizeof(int),
1473                 .mode           = 0644,
1474                 .proc_handler   = proc_dointvec_minmax,
1475                 .extra1         = &min_extfrag_threshold,
1476                 .extra2         = &max_extfrag_threshold,
1477         },
1478         {
1479                 .procname       = "compact_unevictable_allowed",
1480                 .data           = &sysctl_compact_unevictable_allowed,
1481                 .maxlen         = sizeof(int),
1482                 .mode           = 0644,
1483                 .proc_handler   = proc_dointvec,
1484                 .extra1         = &zero,
1485                 .extra2         = &one,
1486         },
1487
1488 #endif /* CONFIG_COMPACTION */
1489         {
1490                 .procname       = "min_free_kbytes",
1491                 .data           = &min_free_kbytes,
1492                 .maxlen         = sizeof(min_free_kbytes),
1493                 .mode           = 0644,
1494                 .proc_handler   = min_free_kbytes_sysctl_handler,
1495                 .extra1         = &zero,
1496         },
1497         {
1498                 .procname       = "watermark_boost_factor",
1499                 .data           = &watermark_boost_factor,
1500                 .maxlen         = sizeof(watermark_boost_factor),
1501                 .mode           = 0644,
1502                 .proc_handler   = watermark_boost_factor_sysctl_handler,
1503                 .extra1         = &zero,
1504         },
1505         {
1506                 .procname       = "watermark_scale_factor",
1507                 .data           = &watermark_scale_factor,
1508                 .maxlen         = sizeof(watermark_scale_factor),
1509                 .mode           = 0644,
1510                 .proc_handler   = watermark_scale_factor_sysctl_handler,
1511                 .extra1         = &one,
1512                 .extra2         = &one_thousand,
1513         },
1514         {
1515                 .procname       = "percpu_pagelist_fraction",
1516                 .data           = &percpu_pagelist_fraction,
1517                 .maxlen         = sizeof(percpu_pagelist_fraction),
1518                 .mode           = 0644,
1519                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1520                 .extra1         = &zero,
1521         },
1522 #ifdef CONFIG_MMU
1523         {
1524                 .procname       = "max_map_count",
1525                 .data           = &sysctl_max_map_count,
1526                 .maxlen         = sizeof(sysctl_max_map_count),
1527                 .mode           = 0644,
1528                 .proc_handler   = proc_dointvec_minmax,
1529                 .extra1         = &zero,
1530         },
1531 #else
1532         {
1533                 .procname       = "nr_trim_pages",
1534                 .data           = &sysctl_nr_trim_pages,
1535                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1536                 .mode           = 0644,
1537                 .proc_handler   = proc_dointvec_minmax,
1538                 .extra1         = &zero,
1539         },
1540 #endif
1541         {
1542                 .procname       = "laptop_mode",
1543                 .data           = &laptop_mode,
1544                 .maxlen         = sizeof(laptop_mode),
1545                 .mode           = 0644,
1546                 .proc_handler   = proc_dointvec_jiffies,
1547         },
1548         {
1549                 .procname       = "block_dump",
1550                 .data           = &block_dump,
1551                 .maxlen         = sizeof(block_dump),
1552                 .mode           = 0644,
1553                 .proc_handler   = proc_dointvec,
1554                 .extra1         = &zero,
1555         },
1556         {
1557                 .procname       = "vfs_cache_pressure",
1558                 .data           = &sysctl_vfs_cache_pressure,
1559                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1560                 .mode           = 0644,
1561                 .proc_handler   = proc_dointvec,
1562                 .extra1         = &zero,
1563         },
1564 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1565         {
1566                 .procname       = "legacy_va_layout",
1567                 .data           = &sysctl_legacy_va_layout,
1568                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1569                 .mode           = 0644,
1570                 .proc_handler   = proc_dointvec,
1571                 .extra1         = &zero,
1572         },
1573 #endif
1574 #ifdef CONFIG_NUMA
1575         {
1576                 .procname       = "zone_reclaim_mode",
1577                 .data           = &node_reclaim_mode,
1578                 .maxlen         = sizeof(node_reclaim_mode),
1579                 .mode           = 0644,
1580                 .proc_handler   = proc_dointvec,
1581                 .extra1         = &zero,
1582         },
1583         {
1584                 .procname       = "min_unmapped_ratio",
1585                 .data           = &sysctl_min_unmapped_ratio,
1586                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1587                 .mode           = 0644,
1588                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1589                 .extra1         = &zero,
1590                 .extra2         = &one_hundred,
1591         },
1592         {
1593                 .procname       = "min_slab_ratio",
1594                 .data           = &sysctl_min_slab_ratio,
1595                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1596                 .mode           = 0644,
1597                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1598                 .extra1         = &zero,
1599                 .extra2         = &one_hundred,
1600         },
1601 #endif
1602 #ifdef CONFIG_SMP
1603         {
1604                 .procname       = "stat_interval",
1605                 .data           = &sysctl_stat_interval,
1606                 .maxlen         = sizeof(sysctl_stat_interval),
1607                 .mode           = 0644,
1608                 .proc_handler   = proc_dointvec_jiffies,
1609         },
1610         {
1611                 .procname       = "stat_refresh",
1612                 .data           = NULL,
1613                 .maxlen         = 0,
1614                 .mode           = 0600,
1615                 .proc_handler   = vmstat_refresh,
1616         },
1617 #endif
1618 #ifdef CONFIG_MMU
1619         {
1620                 .procname       = "mmap_min_addr",
1621                 .data           = &dac_mmap_min_addr,
1622                 .maxlen         = sizeof(unsigned long),
1623                 .mode           = 0644,
1624                 .proc_handler   = mmap_min_addr_handler,
1625         },
1626 #endif
1627 #ifdef CONFIG_NUMA
1628         {
1629                 .procname       = "numa_zonelist_order",
1630                 .data           = &numa_zonelist_order,
1631                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1632                 .mode           = 0644,
1633                 .proc_handler   = numa_zonelist_order_handler,
1634         },
1635 #endif
1636 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1637    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1638         {
1639                 .procname       = "vdso_enabled",
1640 #ifdef CONFIG_X86_32
1641                 .data           = &vdso32_enabled,
1642                 .maxlen         = sizeof(vdso32_enabled),
1643 #else
1644                 .data           = &vdso_enabled,
1645                 .maxlen         = sizeof(vdso_enabled),
1646 #endif
1647                 .mode           = 0644,
1648                 .proc_handler   = proc_dointvec,
1649                 .extra1         = &zero,
1650         },
1651 #endif
1652 #ifdef CONFIG_HIGHMEM
1653         {
1654                 .procname       = "highmem_is_dirtyable",
1655                 .data           = &vm_highmem_is_dirtyable,
1656                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1657                 .mode           = 0644,
1658                 .proc_handler   = proc_dointvec_minmax,
1659                 .extra1         = &zero,
1660                 .extra2         = &one,
1661         },
1662 #endif
1663 #ifdef CONFIG_MEMORY_FAILURE
1664         {
1665                 .procname       = "memory_failure_early_kill",
1666                 .data           = &sysctl_memory_failure_early_kill,
1667                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1668                 .mode           = 0644,
1669                 .proc_handler   = proc_dointvec_minmax,
1670                 .extra1         = &zero,
1671                 .extra2         = &one,
1672         },
1673         {
1674                 .procname       = "memory_failure_recovery",
1675                 .data           = &sysctl_memory_failure_recovery,
1676                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1677                 .mode           = 0644,
1678                 .proc_handler   = proc_dointvec_minmax,
1679                 .extra1         = &zero,
1680                 .extra2         = &one,
1681         },
1682 #endif
1683         {
1684                 .procname       = "user_reserve_kbytes",
1685                 .data           = &sysctl_user_reserve_kbytes,
1686                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1687                 .mode           = 0644,
1688                 .proc_handler   = proc_doulongvec_minmax,
1689         },
1690         {
1691                 .procname       = "admin_reserve_kbytes",
1692                 .data           = &sysctl_admin_reserve_kbytes,
1693                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1694                 .mode           = 0644,
1695                 .proc_handler   = proc_doulongvec_minmax,
1696         },
1697 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1698         {
1699                 .procname       = "mmap_rnd_bits",
1700                 .data           = &mmap_rnd_bits,
1701                 .maxlen         = sizeof(mmap_rnd_bits),
1702                 .mode           = 0600,
1703                 .proc_handler   = proc_dointvec_minmax,
1704                 .extra1         = (void *)&mmap_rnd_bits_min,
1705                 .extra2         = (void *)&mmap_rnd_bits_max,
1706         },
1707 #endif
1708 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1709         {
1710                 .procname       = "mmap_rnd_compat_bits",
1711                 .data           = &mmap_rnd_compat_bits,
1712                 .maxlen         = sizeof(mmap_rnd_compat_bits),
1713                 .mode           = 0600,
1714                 .proc_handler   = proc_dointvec_minmax,
1715                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
1716                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
1717         },
1718 #endif
1719         { }
1720 };
1721
1722 static struct ctl_table fs_table[] = {
1723         {
1724                 .procname       = "inode-nr",
1725                 .data           = &inodes_stat,
1726                 .maxlen         = 2*sizeof(long),
1727                 .mode           = 0444,
1728                 .proc_handler   = proc_nr_inodes,
1729         },
1730         {
1731                 .procname       = "inode-state",
1732                 .data           = &inodes_stat,
1733                 .maxlen         = 7*sizeof(long),
1734                 .mode           = 0444,
1735                 .proc_handler   = proc_nr_inodes,
1736         },
1737         {
1738                 .procname       = "file-nr",
1739                 .data           = &files_stat,
1740                 .maxlen         = sizeof(files_stat),
1741                 .mode           = 0444,
1742                 .proc_handler   = proc_nr_files,
1743         },
1744         {
1745                 .procname       = "file-max",
1746                 .data           = &files_stat.max_files,
1747                 .maxlen         = sizeof(files_stat.max_files),
1748                 .mode           = 0644,
1749                 .proc_handler   = proc_doulongvec_minmax,
1750         },
1751         {
1752                 .procname       = "nr_open",
1753                 .data           = &sysctl_nr_open,
1754                 .maxlen         = sizeof(unsigned int),
1755                 .mode           = 0644,
1756                 .proc_handler   = proc_dointvec_minmax,
1757                 .extra1         = &sysctl_nr_open_min,
1758                 .extra2         = &sysctl_nr_open_max,
1759         },
1760         {
1761                 .procname       = "dentry-state",
1762                 .data           = &dentry_stat,
1763                 .maxlen         = 6*sizeof(long),
1764                 .mode           = 0444,
1765                 .proc_handler   = proc_nr_dentry,
1766         },
1767         {
1768                 .procname       = "overflowuid",
1769                 .data           = &fs_overflowuid,
1770                 .maxlen         = sizeof(int),
1771                 .mode           = 0644,
1772                 .proc_handler   = proc_dointvec_minmax,
1773                 .extra1         = &minolduid,
1774                 .extra2         = &maxolduid,
1775         },
1776         {
1777                 .procname       = "overflowgid",
1778                 .data           = &fs_overflowgid,
1779                 .maxlen         = sizeof(int),
1780                 .mode           = 0644,
1781                 .proc_handler   = proc_dointvec_minmax,
1782                 .extra1         = &minolduid,
1783                 .extra2         = &maxolduid,
1784         },
1785 #ifdef CONFIG_FILE_LOCKING
1786         {
1787                 .procname       = "leases-enable",
1788                 .data           = &leases_enable,
1789                 .maxlen         = sizeof(int),
1790                 .mode           = 0644,
1791                 .proc_handler   = proc_dointvec,
1792         },
1793 #endif
1794 #ifdef CONFIG_DNOTIFY
1795         {
1796                 .procname       = "dir-notify-enable",
1797                 .data           = &dir_notify_enable,
1798                 .maxlen         = sizeof(int),
1799                 .mode           = 0644,
1800                 .proc_handler   = proc_dointvec,
1801         },
1802 #endif
1803 #ifdef CONFIG_MMU
1804 #ifdef CONFIG_FILE_LOCKING
1805         {
1806                 .procname       = "lease-break-time",
1807                 .data           = &lease_break_time,
1808                 .maxlen         = sizeof(int),
1809                 .mode           = 0644,
1810                 .proc_handler   = proc_dointvec,
1811         },
1812 #endif
1813 #ifdef CONFIG_AIO
1814         {
1815                 .procname       = "aio-nr",
1816                 .data           = &aio_nr,
1817                 .maxlen         = sizeof(aio_nr),
1818                 .mode           = 0444,
1819                 .proc_handler   = proc_doulongvec_minmax,
1820         },
1821         {
1822                 .procname       = "aio-max-nr",
1823                 .data           = &aio_max_nr,
1824                 .maxlen         = sizeof(aio_max_nr),
1825                 .mode           = 0644,
1826                 .proc_handler   = proc_doulongvec_minmax,
1827         },
1828 #endif /* CONFIG_AIO */
1829 #ifdef CONFIG_INOTIFY_USER
1830         {
1831                 .procname       = "inotify",
1832                 .mode           = 0555,
1833                 .child          = inotify_table,
1834         },
1835 #endif
1836 #ifdef CONFIG_EPOLL
1837         {
1838                 .procname       = "epoll",
1839                 .mode           = 0555,
1840                 .child          = epoll_table,
1841         },
1842 #endif
1843 #endif
1844         {
1845                 .procname       = "protected_symlinks",
1846                 .data           = &sysctl_protected_symlinks,
1847                 .maxlen         = sizeof(int),
1848                 .mode           = 0600,
1849                 .proc_handler   = proc_dointvec_minmax,
1850                 .extra1         = &zero,
1851                 .extra2         = &one,
1852         },
1853         {
1854                 .procname       = "protected_hardlinks",
1855                 .data           = &sysctl_protected_hardlinks,
1856                 .maxlen         = sizeof(int),
1857                 .mode           = 0600,
1858                 .proc_handler   = proc_dointvec_minmax,
1859                 .extra1         = &zero,
1860                 .extra2         = &one,
1861         },
1862         {
1863                 .procname       = "protected_fifos",
1864                 .data           = &sysctl_protected_fifos,
1865                 .maxlen         = sizeof(int),
1866                 .mode           = 0600,
1867                 .proc_handler   = proc_dointvec_minmax,
1868                 .extra1         = &zero,
1869                 .extra2         = &two,
1870         },
1871         {
1872                 .procname       = "protected_regular",
1873                 .data           = &sysctl_protected_regular,
1874                 .maxlen         = sizeof(int),
1875                 .mode           = 0600,
1876                 .proc_handler   = proc_dointvec_minmax,
1877                 .extra1         = &zero,
1878                 .extra2         = &two,
1879         },
1880         {
1881                 .procname       = "suid_dumpable",
1882                 .data           = &suid_dumpable,
1883                 .maxlen         = sizeof(int),
1884                 .mode           = 0644,
1885                 .proc_handler   = proc_dointvec_minmax_coredump,
1886                 .extra1         = &zero,
1887                 .extra2         = &two,
1888         },
1889 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1890         {
1891                 .procname       = "binfmt_misc",
1892                 .mode           = 0555,
1893                 .child          = sysctl_mount_point,
1894         },
1895 #endif
1896         {
1897                 .procname       = "pipe-max-size",
1898                 .data           = &pipe_max_size,
1899                 .maxlen         = sizeof(pipe_max_size),
1900                 .mode           = 0644,
1901                 .proc_handler   = proc_dopipe_max_size,
1902         },
1903         {
1904                 .procname       = "pipe-user-pages-hard",
1905                 .data           = &pipe_user_pages_hard,
1906                 .maxlen         = sizeof(pipe_user_pages_hard),
1907                 .mode           = 0644,
1908                 .proc_handler   = proc_doulongvec_minmax,
1909         },
1910         {
1911                 .procname       = "pipe-user-pages-soft",
1912                 .data           = &pipe_user_pages_soft,
1913                 .maxlen         = sizeof(pipe_user_pages_soft),
1914                 .mode           = 0644,
1915                 .proc_handler   = proc_doulongvec_minmax,
1916         },
1917         {
1918                 .procname       = "mount-max",
1919                 .data           = &sysctl_mount_max,
1920                 .maxlen         = sizeof(unsigned int),
1921                 .mode           = 0644,
1922                 .proc_handler   = proc_dointvec_minmax,
1923                 .extra1         = &one,
1924         },
1925         { }
1926 };
1927
1928 static struct ctl_table debug_table[] = {
1929 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1930         {
1931                 .procname       = "exception-trace",
1932                 .data           = &show_unhandled_signals,
1933                 .maxlen         = sizeof(int),
1934                 .mode           = 0644,
1935                 .proc_handler   = proc_dointvec
1936         },
1937 #endif
1938 #if defined(CONFIG_OPTPROBES)
1939         {
1940                 .procname       = "kprobes-optimization",
1941                 .data           = &sysctl_kprobes_optimization,
1942                 .maxlen         = sizeof(int),
1943                 .mode           = 0644,
1944                 .proc_handler   = proc_kprobes_optimization_handler,
1945                 .extra1         = &zero,
1946                 .extra2         = &one,
1947         },
1948 #endif
1949         { }
1950 };
1951
1952 static struct ctl_table dev_table[] = {
1953         { }
1954 };
1955
1956 int __init sysctl_init(void)
1957 {
1958         struct ctl_table_header *hdr;
1959
1960         hdr = register_sysctl_table(sysctl_base_table);
1961         kmemleak_not_leak(hdr);
1962         return 0;
1963 }
1964
1965 #endif /* CONFIG_SYSCTL */
1966
1967 /*
1968  * /proc/sys support
1969  */
1970
1971 #ifdef CONFIG_PROC_SYSCTL
1972
1973 static int _proc_do_string(char *data, int maxlen, int write,
1974                            char __user *buffer,
1975                            size_t *lenp, loff_t *ppos)
1976 {
1977         size_t len;
1978         char __user *p;
1979         char c;
1980
1981         if (!data || !maxlen || !*lenp) {
1982                 *lenp = 0;
1983                 return 0;
1984         }
1985
1986         if (write) {
1987                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1988                         /* Only continue writes not past the end of buffer. */
1989                         len = strlen(data);
1990                         if (len > maxlen - 1)
1991                                 len = maxlen - 1;
1992
1993                         if (*ppos > len)
1994                                 return 0;
1995                         len = *ppos;
1996                 } else {
1997                         /* Start writing from beginning of buffer. */
1998                         len = 0;
1999                 }
2000
2001                 *ppos += *lenp;
2002                 p = buffer;
2003                 while ((p - buffer) < *lenp && len < maxlen - 1) {
2004                         if (get_user(c, p++))
2005                                 return -EFAULT;
2006                         if (c == 0 || c == '\n')
2007                                 break;
2008                         data[len++] = c;
2009                 }
2010                 data[len] = 0;
2011         } else {
2012                 len = strlen(data);
2013                 if (len > maxlen)
2014                         len = maxlen;
2015
2016                 if (*ppos > len) {
2017                         *lenp = 0;
2018                         return 0;
2019                 }
2020
2021                 data += *ppos;
2022                 len  -= *ppos;
2023
2024                 if (len > *lenp)
2025                         len = *lenp;
2026                 if (len)
2027                         if (copy_to_user(buffer, data, len))
2028                                 return -EFAULT;
2029                 if (len < *lenp) {
2030                         if (put_user('\n', buffer + len))
2031                                 return -EFAULT;
2032                         len++;
2033                 }
2034                 *lenp = len;
2035                 *ppos += len;
2036         }
2037         return 0;
2038 }
2039
2040 static void warn_sysctl_write(struct ctl_table *table)
2041 {
2042         pr_warn_once("%s wrote to %s when file position was not 0!\n"
2043                 "This will not be supported in the future. To silence this\n"
2044                 "warning, set kernel.sysctl_writes_strict = -1\n",
2045                 current->comm, table->procname);
2046 }
2047
2048 /**
2049  * proc_first_pos_non_zero_ignore - check if first position is allowed
2050  * @ppos: file position
2051  * @table: the sysctl table
2052  *
2053  * Returns true if the first position is non-zero and the sysctl_writes_strict
2054  * mode indicates this is not allowed for numeric input types. String proc
2055  * handlers can ignore the return value.
2056  */
2057 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2058                                            struct ctl_table *table)
2059 {
2060         if (!*ppos)
2061                 return false;
2062
2063         switch (sysctl_writes_strict) {
2064         case SYSCTL_WRITES_STRICT:
2065                 return true;
2066         case SYSCTL_WRITES_WARN:
2067                 warn_sysctl_write(table);
2068                 return false;
2069         default:
2070                 return false;
2071         }
2072 }
2073
2074 /**
2075  * proc_dostring - read a string sysctl
2076  * @table: the sysctl table
2077  * @write: %TRUE if this is a write to the sysctl file
2078  * @buffer: the user buffer
2079  * @lenp: the size of the user buffer
2080  * @ppos: file position
2081  *
2082  * Reads/writes a string from/to the user buffer. If the kernel
2083  * buffer provided is not large enough to hold the string, the
2084  * string is truncated. The copied string is %NULL-terminated.
2085  * If the string is being read by the user process, it is copied
2086  * and a newline '\n' is added. It is truncated if the buffer is
2087  * not large enough.
2088  *
2089  * Returns 0 on success.
2090  */
2091 int proc_dostring(struct ctl_table *table, int write,
2092                   void __user *buffer, size_t *lenp, loff_t *ppos)
2093 {
2094         if (write)
2095                 proc_first_pos_non_zero_ignore(ppos, table);
2096
2097         return _proc_do_string((char *)(table->data), table->maxlen, write,
2098                                (char __user *)buffer, lenp, ppos);
2099 }
2100
2101 static size_t proc_skip_spaces(char **buf)
2102 {
2103         size_t ret;
2104         char *tmp = skip_spaces(*buf);
2105         ret = tmp - *buf;
2106         *buf = tmp;
2107         return ret;
2108 }
2109
2110 static void proc_skip_char(char **buf, size_t *size, const char v)
2111 {
2112         while (*size) {
2113                 if (**buf != v)
2114                         break;
2115                 (*size)--;
2116                 (*buf)++;
2117         }
2118 }
2119
2120 #define TMPBUFLEN 22
2121 /**
2122  * proc_get_long - reads an ASCII formatted integer from a user buffer
2123  *
2124  * @buf: a kernel buffer
2125  * @size: size of the kernel buffer
2126  * @val: this is where the number will be stored
2127  * @neg: set to %TRUE if number is negative
2128  * @perm_tr: a vector which contains the allowed trailers
2129  * @perm_tr_len: size of the perm_tr vector
2130  * @tr: pointer to store the trailer character
2131  *
2132  * In case of success %0 is returned and @buf and @size are updated with
2133  * the amount of bytes read. If @tr is non-NULL and a trailing
2134  * character exists (size is non-zero after returning from this
2135  * function), @tr is updated with the trailing character.
2136  */
2137 static int proc_get_long(char **buf, size_t *size,
2138                           unsigned long *val, bool *neg,
2139                           const char *perm_tr, unsigned perm_tr_len, char *tr)
2140 {
2141         int len;
2142         char *p, tmp[TMPBUFLEN];
2143
2144         if (!*size)
2145                 return -EINVAL;
2146
2147         len = *size;
2148         if (len > TMPBUFLEN - 1)
2149                 len = TMPBUFLEN - 1;
2150
2151         memcpy(tmp, *buf, len);
2152
2153         tmp[len] = 0;
2154         p = tmp;
2155         if (*p == '-' && *size > 1) {
2156                 *neg = true;
2157                 p++;
2158         } else
2159                 *neg = false;
2160         if (!isdigit(*p))
2161                 return -EINVAL;
2162
2163         *val = simple_strtoul(p, &p, 0);
2164
2165         len = p - tmp;
2166
2167         /* We don't know if the next char is whitespace thus we may accept
2168          * invalid integers (e.g. 1234...a) or two integers instead of one
2169          * (e.g. 123...1). So lets not allow such large numbers. */
2170         if (len == TMPBUFLEN - 1)
2171                 return -EINVAL;
2172
2173         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2174                 return -EINVAL;
2175
2176         if (tr && (len < *size))
2177                 *tr = *p;
2178
2179         *buf += len;
2180         *size -= len;
2181
2182         return 0;
2183 }
2184
2185 /**
2186  * proc_put_long - converts an integer to a decimal ASCII formatted string
2187  *
2188  * @buf: the user buffer
2189  * @size: the size of the user buffer
2190  * @val: the integer to be converted
2191  * @neg: sign of the number, %TRUE for negative
2192  *
2193  * In case of success %0 is returned and @buf and @size are updated with
2194  * the amount of bytes written.
2195  */
2196 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2197                           bool neg)
2198 {
2199         int len;
2200         char tmp[TMPBUFLEN], *p = tmp;
2201
2202         sprintf(p, "%s%lu", neg ? "-" : "", val);
2203         len = strlen(tmp);
2204         if (len > *size)
2205                 len = *size;
2206         if (copy_to_user(*buf, tmp, len))
2207                 return -EFAULT;
2208         *size -= len;
2209         *buf += len;
2210         return 0;
2211 }
2212 #undef TMPBUFLEN
2213
2214 static int proc_put_char(void __user **buf, size_t *size, char c)
2215 {
2216         if (*size) {
2217                 char __user **buffer = (char __user **)buf;
2218                 if (put_user(c, *buffer))
2219                         return -EFAULT;
2220                 (*size)--, (*buffer)++;
2221                 *buf = *buffer;
2222         }
2223         return 0;
2224 }
2225
2226 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2227                                  int *valp,
2228                                  int write, void *data)
2229 {
2230         if (write) {
2231                 if (*negp) {
2232                         if (*lvalp > (unsigned long) INT_MAX + 1)
2233                                 return -EINVAL;
2234                         *valp = -*lvalp;
2235                 } else {
2236                         if (*lvalp > (unsigned long) INT_MAX)
2237                                 return -EINVAL;
2238                         *valp = *lvalp;
2239                 }
2240         } else {
2241                 int val = *valp;
2242                 if (val < 0) {
2243                         *negp = true;
2244                         *lvalp = -(unsigned long)val;
2245                 } else {
2246                         *negp = false;
2247                         *lvalp = (unsigned long)val;
2248                 }
2249         }
2250         return 0;
2251 }
2252
2253 static int do_proc_douintvec_conv(unsigned long *lvalp,
2254                                   unsigned int *valp,
2255                                   int write, void *data)
2256 {
2257         if (write) {
2258                 if (*lvalp > UINT_MAX)
2259                         return -EINVAL;
2260                 *valp = *lvalp;
2261         } else {
2262                 unsigned int val = *valp;
2263                 *lvalp = (unsigned long)val;
2264         }
2265         return 0;
2266 }
2267
2268 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2269
2270 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2271                   int write, void __user *buffer,
2272                   size_t *lenp, loff_t *ppos,
2273                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2274                               int write, void *data),
2275                   void *data)
2276 {
2277         int *i, vleft, first = 1, err = 0;
2278         size_t left;
2279         char *kbuf = NULL, *p;
2280
2281         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2282                 *lenp = 0;
2283                 return 0;
2284         }
2285
2286         i = (int *) tbl_data;
2287         vleft = table->maxlen / sizeof(*i);
2288         left = *lenp;
2289
2290         if (!conv)
2291                 conv = do_proc_dointvec_conv;
2292
2293         if (write) {
2294                 if (proc_first_pos_non_zero_ignore(ppos, table))
2295                         goto out;
2296
2297                 if (left > PAGE_SIZE - 1)
2298                         left = PAGE_SIZE - 1;
2299                 p = kbuf = memdup_user_nul(buffer, left);
2300                 if (IS_ERR(kbuf))
2301                         return PTR_ERR(kbuf);
2302         }
2303
2304         for (; left && vleft--; i++, first=0) {
2305                 unsigned long lval;
2306                 bool neg;
2307
2308                 if (write) {
2309                         left -= proc_skip_spaces(&p);
2310
2311                         if (!left)
2312                                 break;
2313                         err = proc_get_long(&p, &left, &lval, &neg,
2314                                              proc_wspace_sep,
2315                                              sizeof(proc_wspace_sep), NULL);
2316                         if (err)
2317                                 break;
2318                         if (conv(&neg, &lval, i, 1, data)) {
2319                                 err = -EINVAL;
2320                                 break;
2321                         }
2322                 } else {
2323                         if (conv(&neg, &lval, i, 0, data)) {
2324                                 err = -EINVAL;
2325                                 break;
2326                         }
2327                         if (!first)
2328                                 err = proc_put_char(&buffer, &left, '\t');
2329                         if (err)
2330                                 break;
2331                         err = proc_put_long(&buffer, &left, lval, neg);
2332                         if (err)
2333                                 break;
2334                 }
2335         }
2336
2337         if (!write && !first && left && !err)
2338                 err = proc_put_char(&buffer, &left, '\n');
2339         if (write && !err && left)
2340                 left -= proc_skip_spaces(&p);
2341         if (write) {
2342                 kfree(kbuf);
2343                 if (first)
2344                         return err ? : -EINVAL;
2345         }
2346         *lenp -= left;
2347 out:
2348         *ppos += *lenp;
2349         return err;
2350 }
2351
2352 static int do_proc_dointvec(struct ctl_table *table, int write,
2353                   void __user *buffer, size_t *lenp, loff_t *ppos,
2354                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2355                               int write, void *data),
2356                   void *data)
2357 {
2358         return __do_proc_dointvec(table->data, table, write,
2359                         buffer, lenp, ppos, conv, data);
2360 }
2361
2362 static int do_proc_douintvec_w(unsigned int *tbl_data,
2363                                struct ctl_table *table,
2364                                void __user *buffer,
2365                                size_t *lenp, loff_t *ppos,
2366                                int (*conv)(unsigned long *lvalp,
2367                                            unsigned int *valp,
2368                                            int write, void *data),
2369                                void *data)
2370 {
2371         unsigned long lval;
2372         int err = 0;
2373         size_t left;
2374         bool neg;
2375         char *kbuf = NULL, *p;
2376
2377         left = *lenp;
2378
2379         if (proc_first_pos_non_zero_ignore(ppos, table))
2380                 goto bail_early;
2381
2382         if (left > PAGE_SIZE - 1)
2383                 left = PAGE_SIZE - 1;
2384
2385         p = kbuf = memdup_user_nul(buffer, left);
2386         if (IS_ERR(kbuf))
2387                 return -EINVAL;
2388
2389         left -= proc_skip_spaces(&p);
2390         if (!left) {
2391                 err = -EINVAL;
2392                 goto out_free;
2393         }
2394
2395         err = proc_get_long(&p, &left, &lval, &neg,
2396                              proc_wspace_sep,
2397                              sizeof(proc_wspace_sep), NULL);
2398         if (err || neg) {
2399                 err = -EINVAL;
2400                 goto out_free;
2401         }
2402
2403         if (conv(&lval, tbl_data, 1, data)) {
2404                 err = -EINVAL;
2405                 goto out_free;
2406         }
2407
2408         if (!err && left)
2409                 left -= proc_skip_spaces(&p);
2410
2411 out_free:
2412         kfree(kbuf);
2413         if (err)
2414                 return -EINVAL;
2415
2416         return 0;
2417
2418         /* This is in keeping with old __do_proc_dointvec() */
2419 bail_early:
2420         *ppos += *lenp;
2421         return err;
2422 }
2423
2424 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2425                                size_t *lenp, loff_t *ppos,
2426                                int (*conv)(unsigned long *lvalp,
2427                                            unsigned int *valp,
2428                                            int write, void *data),
2429                                void *data)
2430 {
2431         unsigned long lval;
2432         int err = 0;
2433         size_t left;
2434
2435         left = *lenp;
2436
2437         if (conv(&lval, tbl_data, 0, data)) {
2438                 err = -EINVAL;
2439                 goto out;
2440         }
2441
2442         err = proc_put_long(&buffer, &left, lval, false);
2443         if (err || !left)
2444                 goto out;
2445
2446         err = proc_put_char(&buffer, &left, '\n');
2447
2448 out:
2449         *lenp -= left;
2450         *ppos += *lenp;
2451
2452         return err;
2453 }
2454
2455 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2456                                int write, void __user *buffer,
2457                                size_t *lenp, loff_t *ppos,
2458                                int (*conv)(unsigned long *lvalp,
2459                                            unsigned int *valp,
2460                                            int write, void *data),
2461                                void *data)
2462 {
2463         unsigned int *i, vleft;
2464
2465         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2466                 *lenp = 0;
2467                 return 0;
2468         }
2469
2470         i = (unsigned int *) tbl_data;
2471         vleft = table->maxlen / sizeof(*i);
2472
2473         /*
2474          * Arrays are not supported, keep this simple. *Do not* add
2475          * support for them.
2476          */
2477         if (vleft != 1) {
2478                 *lenp = 0;
2479                 return -EINVAL;
2480         }
2481
2482         if (!conv)
2483                 conv = do_proc_douintvec_conv;
2484
2485         if (write)
2486                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2487                                            conv, data);
2488         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2489 }
2490
2491 static int do_proc_douintvec(struct ctl_table *table, int write,
2492                              void __user *buffer, size_t *lenp, loff_t *ppos,
2493                              int (*conv)(unsigned long *lvalp,
2494                                          unsigned int *valp,
2495                                          int write, void *data),
2496                              void *data)
2497 {
2498         return __do_proc_douintvec(table->data, table, write,
2499                                    buffer, lenp, ppos, conv, data);
2500 }
2501
2502 /**
2503  * proc_dointvec - read a vector of integers
2504  * @table: the sysctl table
2505  * @write: %TRUE if this is a write to the sysctl file
2506  * @buffer: the user buffer
2507  * @lenp: the size of the user buffer
2508  * @ppos: file position
2509  *
2510  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2511  * values from/to the user buffer, treated as an ASCII string.
2512  *
2513  * Returns 0 on success.
2514  */
2515 int proc_dointvec(struct ctl_table *table, int write,
2516                      void __user *buffer, size_t *lenp, loff_t *ppos)
2517 {
2518         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2519 }
2520
2521 /**
2522  * proc_douintvec - read a vector of unsigned integers
2523  * @table: the sysctl table
2524  * @write: %TRUE if this is a write to the sysctl file
2525  * @buffer: the user buffer
2526  * @lenp: the size of the user buffer
2527  * @ppos: file position
2528  *
2529  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2530  * values from/to the user buffer, treated as an ASCII string.
2531  *
2532  * Returns 0 on success.
2533  */
2534 int proc_douintvec(struct ctl_table *table, int write,
2535                      void __user *buffer, size_t *lenp, loff_t *ppos)
2536 {
2537         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2538                                  do_proc_douintvec_conv, NULL);
2539 }
2540
2541 /*
2542  * Taint values can only be increased
2543  * This means we can safely use a temporary.
2544  */
2545 static int proc_taint(struct ctl_table *table, int write,
2546                                void __user *buffer, size_t *lenp, loff_t *ppos)
2547 {
2548         struct ctl_table t;
2549         unsigned long tmptaint = get_taint();
2550         int err;
2551
2552         if (write && !capable(CAP_SYS_ADMIN))
2553                 return -EPERM;
2554
2555         t = *table;
2556         t.data = &tmptaint;
2557         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2558         if (err < 0)
2559                 return err;
2560
2561         if (write) {
2562                 /*
2563                  * Poor man's atomic or. Not worth adding a primitive
2564                  * to everyone's atomic.h for this
2565                  */
2566                 int i;
2567                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2568                         if ((tmptaint >> i) & 1)
2569                                 add_taint(i, LOCKDEP_STILL_OK);
2570                 }
2571         }
2572
2573         return err;
2574 }
2575
2576 #ifdef CONFIG_PRINTK
2577 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2578                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2579 {
2580         if (write && !capable(CAP_SYS_ADMIN))
2581                 return -EPERM;
2582
2583         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2584 }
2585 #endif
2586
2587 /**
2588  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2589  * @min: pointer to minimum allowable value
2590  * @max: pointer to maximum allowable value
2591  *
2592  * The do_proc_dointvec_minmax_conv_param structure provides the
2593  * minimum and maximum values for doing range checking for those sysctl
2594  * parameters that use the proc_dointvec_minmax() handler.
2595  */
2596 struct do_proc_dointvec_minmax_conv_param {
2597         int *min;
2598         int *max;
2599 };
2600
2601 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2602                                         int *valp,
2603                                         int write, void *data)
2604 {
2605         struct do_proc_dointvec_minmax_conv_param *param = data;
2606         if (write) {
2607                 int val = *negp ? -*lvalp : *lvalp;
2608                 if ((param->min && *param->min > val) ||
2609                     (param->max && *param->max < val))
2610                         return -EINVAL;
2611                 *valp = val;
2612         } else {
2613                 int val = *valp;
2614                 if (val < 0) {
2615                         *negp = true;
2616                         *lvalp = -(unsigned long)val;
2617                 } else {
2618                         *negp = false;
2619                         *lvalp = (unsigned long)val;
2620                 }
2621         }
2622         return 0;
2623 }
2624
2625 /**
2626  * proc_dointvec_minmax - read a vector of integers with min/max values
2627  * @table: the sysctl table
2628  * @write: %TRUE if this is a write to the sysctl file
2629  * @buffer: the user buffer
2630  * @lenp: the size of the user buffer
2631  * @ppos: file position
2632  *
2633  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2634  * values from/to the user buffer, treated as an ASCII string.
2635  *
2636  * This routine will ensure the values are within the range specified by
2637  * table->extra1 (min) and table->extra2 (max).
2638  *
2639  * Returns 0 on success or -EINVAL on write when the range check fails.
2640  */
2641 int proc_dointvec_minmax(struct ctl_table *table, int write,
2642                   void __user *buffer, size_t *lenp, loff_t *ppos)
2643 {
2644         struct do_proc_dointvec_minmax_conv_param param = {
2645                 .min = (int *) table->extra1,
2646                 .max = (int *) table->extra2,
2647         };
2648         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2649                                 do_proc_dointvec_minmax_conv, &param);
2650 }
2651
2652 /**
2653  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2654  * @min: pointer to minimum allowable value
2655  * @max: pointer to maximum allowable value
2656  *
2657  * The do_proc_douintvec_minmax_conv_param structure provides the
2658  * minimum and maximum values for doing range checking for those sysctl
2659  * parameters that use the proc_douintvec_minmax() handler.
2660  */
2661 struct do_proc_douintvec_minmax_conv_param {
2662         unsigned int *min;
2663         unsigned int *max;
2664 };
2665
2666 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2667                                          unsigned int *valp,
2668                                          int write, void *data)
2669 {
2670         struct do_proc_douintvec_minmax_conv_param *param = data;
2671
2672         if (write) {
2673                 unsigned int val = *lvalp;
2674
2675                 if (*lvalp > UINT_MAX)
2676                         return -EINVAL;
2677
2678                 if ((param->min && *param->min > val) ||
2679                     (param->max && *param->max < val))
2680                         return -ERANGE;
2681
2682                 *valp = val;
2683         } else {
2684                 unsigned int val = *valp;
2685                 *lvalp = (unsigned long) val;
2686         }
2687
2688         return 0;
2689 }
2690
2691 /**
2692  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2693  * @table: the sysctl table
2694  * @write: %TRUE if this is a write to the sysctl file
2695  * @buffer: the user buffer
2696  * @lenp: the size of the user buffer
2697  * @ppos: file position
2698  *
2699  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2700  * values from/to the user buffer, treated as an ASCII string. Negative
2701  * strings are not allowed.
2702  *
2703  * This routine will ensure the values are within the range specified by
2704  * table->extra1 (min) and table->extra2 (max). There is a final sanity
2705  * check for UINT_MAX to avoid having to support wrap around uses from
2706  * userspace.
2707  *
2708  * Returns 0 on success or -ERANGE on write when the range check fails.
2709  */
2710 int proc_douintvec_minmax(struct ctl_table *table, int write,
2711                           void __user *buffer, size_t *lenp, loff_t *ppos)
2712 {
2713         struct do_proc_douintvec_minmax_conv_param param = {
2714                 .min = (unsigned int *) table->extra1,
2715                 .max = (unsigned int *) table->extra2,
2716         };
2717         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2718                                  do_proc_douintvec_minmax_conv, &param);
2719 }
2720
2721 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2722                                         unsigned int *valp,
2723                                         int write, void *data)
2724 {
2725         if (write) {
2726                 unsigned int val;
2727
2728                 val = round_pipe_size(*lvalp);
2729                 if (val == 0)
2730                         return -EINVAL;
2731
2732                 *valp = val;
2733         } else {
2734                 unsigned int val = *valp;
2735                 *lvalp = (unsigned long) val;
2736         }
2737
2738         return 0;
2739 }
2740
2741 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2742                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2743 {
2744         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2745                                  do_proc_dopipe_max_size_conv, NULL);
2746 }
2747
2748 static void validate_coredump_safety(void)
2749 {
2750 #ifdef CONFIG_COREDUMP
2751         if (suid_dumpable == SUID_DUMP_ROOT &&
2752             core_pattern[0] != '/' && core_pattern[0] != '|') {
2753                 printk(KERN_WARNING
2754 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2755 "Pipe handler or fully qualified core dump path required.\n"
2756 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2757                 );
2758         }
2759 #endif
2760 }
2761
2762 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2763                 void __user *buffer, size_t *lenp, loff_t *ppos)
2764 {
2765         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2766         if (!error)
2767                 validate_coredump_safety();
2768         return error;
2769 }
2770
2771 #ifdef CONFIG_COREDUMP
2772 static int proc_dostring_coredump(struct ctl_table *table, int write,
2773                   void __user *buffer, size_t *lenp, loff_t *ppos)
2774 {
2775         int error = proc_dostring(table, write, buffer, lenp, ppos);
2776         if (!error)
2777                 validate_coredump_safety();
2778         return error;
2779 }
2780 #endif
2781
2782 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2783                                      void __user *buffer,
2784                                      size_t *lenp, loff_t *ppos,
2785                                      unsigned long convmul,
2786                                      unsigned long convdiv)
2787 {
2788         unsigned long *i, *min, *max;
2789         int vleft, first = 1, err = 0;
2790         size_t left;
2791         char *kbuf = NULL, *p;
2792
2793         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2794                 *lenp = 0;
2795                 return 0;
2796         }
2797
2798         i = (unsigned long *) data;
2799         min = (unsigned long *) table->extra1;
2800         max = (unsigned long *) table->extra2;
2801         vleft = table->maxlen / sizeof(unsigned long);
2802         left = *lenp;
2803
2804         if (write) {
2805                 if (proc_first_pos_non_zero_ignore(ppos, table))
2806                         goto out;
2807
2808                 if (left > PAGE_SIZE - 1)
2809                         left = PAGE_SIZE - 1;
2810                 p = kbuf = memdup_user_nul(buffer, left);
2811                 if (IS_ERR(kbuf))
2812                         return PTR_ERR(kbuf);
2813         }
2814
2815         for (; left && vleft--; i++, first = 0) {
2816                 unsigned long val;
2817
2818                 if (write) {
2819                         bool neg;
2820
2821                         left -= proc_skip_spaces(&p);
2822                         if (!left)
2823                                 break;
2824
2825                         err = proc_get_long(&p, &left, &val, &neg,
2826                                              proc_wspace_sep,
2827                                              sizeof(proc_wspace_sep), NULL);
2828                         if (err)
2829                                 break;
2830                         if (neg)
2831                                 continue;
2832                         val = convmul * val / convdiv;
2833                         if ((min && val < *min) || (max && val > *max))
2834                                 continue;
2835                         *i = val;
2836                 } else {
2837                         val = convdiv * (*i) / convmul;
2838                         if (!first) {
2839                                 err = proc_put_char(&buffer, &left, '\t');
2840                                 if (err)
2841                                         break;
2842                         }
2843                         err = proc_put_long(&buffer, &left, val, false);
2844                         if (err)
2845                                 break;
2846                 }
2847         }
2848
2849         if (!write && !first && left && !err)
2850                 err = proc_put_char(&buffer, &left, '\n');
2851         if (write && !err)
2852                 left -= proc_skip_spaces(&p);
2853         if (write) {
2854                 kfree(kbuf);
2855                 if (first)
2856                         return err ? : -EINVAL;
2857         }
2858         *lenp -= left;
2859 out:
2860         *ppos += *lenp;
2861         return err;
2862 }
2863
2864 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2865                                      void __user *buffer,
2866                                      size_t *lenp, loff_t *ppos,
2867                                      unsigned long convmul,
2868                                      unsigned long convdiv)
2869 {
2870         return __do_proc_doulongvec_minmax(table->data, table, write,
2871                         buffer, lenp, ppos, convmul, convdiv);
2872 }
2873
2874 /**
2875  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2876  * @table: the sysctl table
2877  * @write: %TRUE if this is a write to the sysctl file
2878  * @buffer: the user buffer
2879  * @lenp: the size of the user buffer
2880  * @ppos: file position
2881  *
2882  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2883  * values from/to the user buffer, treated as an ASCII string.
2884  *
2885  * This routine will ensure the values are within the range specified by
2886  * table->extra1 (min) and table->extra2 (max).
2887  *
2888  * Returns 0 on success.
2889  */
2890 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2891                            void __user *buffer, size_t *lenp, loff_t *ppos)
2892 {
2893     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2894 }
2895
2896 /**
2897  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2898  * @table: the sysctl table
2899  * @write: %TRUE if this is a write to the sysctl file
2900  * @buffer: the user buffer
2901  * @lenp: the size of the user buffer
2902  * @ppos: file position
2903  *
2904  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2905  * values from/to the user buffer, treated as an ASCII string. The values
2906  * are treated as milliseconds, and converted to jiffies when they are stored.
2907  *
2908  * This routine will ensure the values are within the range specified by
2909  * table->extra1 (min) and table->extra2 (max).
2910  *
2911  * Returns 0 on success.
2912  */
2913 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2914                                       void __user *buffer,
2915                                       size_t *lenp, loff_t *ppos)
2916 {
2917     return do_proc_doulongvec_minmax(table, write, buffer,
2918                                      lenp, ppos, HZ, 1000l);
2919 }
2920
2921
2922 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2923                                          int *valp,
2924                                          int write, void *data)
2925 {
2926         if (write) {
2927                 if (*lvalp > INT_MAX / HZ)
2928                         return 1;
2929                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2930         } else {
2931                 int val = *valp;
2932                 unsigned long lval;
2933                 if (val < 0) {
2934                         *negp = true;
2935                         lval = -(unsigned long)val;
2936                 } else {
2937                         *negp = false;
2938                         lval = (unsigned long)val;
2939                 }
2940                 *lvalp = lval / HZ;
2941         }
2942         return 0;
2943 }
2944
2945 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2946                                                 int *valp,
2947                                                 int write, void *data)
2948 {
2949         if (write) {
2950                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2951                         return 1;
2952                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2953         } else {
2954                 int val = *valp;
2955                 unsigned long lval;
2956                 if (val < 0) {
2957                         *negp = true;
2958                         lval = -(unsigned long)val;
2959                 } else {
2960                         *negp = false;
2961                         lval = (unsigned long)val;
2962                 }
2963                 *lvalp = jiffies_to_clock_t(lval);
2964         }
2965         return 0;
2966 }
2967
2968 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2969                                             int *valp,
2970                                             int write, void *data)
2971 {
2972         if (write) {
2973                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2974
2975                 if (jif > INT_MAX)
2976                         return 1;
2977                 *valp = (int)jif;
2978         } else {
2979                 int val = *valp;
2980                 unsigned long lval;
2981                 if (val < 0) {
2982                         *negp = true;
2983                         lval = -(unsigned long)val;
2984                 } else {
2985                         *negp = false;
2986                         lval = (unsigned long)val;
2987                 }
2988                 *lvalp = jiffies_to_msecs(lval);
2989         }
2990         return 0;
2991 }
2992
2993 /**
2994  * proc_dointvec_jiffies - read a vector of integers as seconds
2995  * @table: the sysctl table
2996  * @write: %TRUE if this is a write to the sysctl file
2997  * @buffer: the user buffer
2998  * @lenp: the size of the user buffer
2999  * @ppos: file position
3000  *
3001  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3002  * values from/to the user buffer, treated as an ASCII string.
3003  * The values read are assumed to be in seconds, and are converted into
3004  * jiffies.
3005  *
3006  * Returns 0 on success.
3007  */
3008 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3009                           void __user *buffer, size_t *lenp, loff_t *ppos)
3010 {
3011     return do_proc_dointvec(table,write,buffer,lenp,ppos,
3012                             do_proc_dointvec_jiffies_conv,NULL);
3013 }
3014
3015 /**
3016  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3017  * @table: the sysctl table
3018  * @write: %TRUE if this is a write to the sysctl file
3019  * @buffer: the user buffer
3020  * @lenp: the size of the user buffer
3021  * @ppos: pointer to the file position
3022  *
3023  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3024  * values from/to the user buffer, treated as an ASCII string.
3025  * The values read are assumed to be in 1/USER_HZ seconds, and
3026  * are converted into jiffies.
3027  *
3028  * Returns 0 on success.
3029  */
3030 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3031                                  void __user *buffer, size_t *lenp, loff_t *ppos)
3032 {
3033     return do_proc_dointvec(table,write,buffer,lenp,ppos,
3034                             do_proc_dointvec_userhz_jiffies_conv,NULL);
3035 }
3036
3037 /**
3038  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3039  * @table: the sysctl table
3040  * @write: %TRUE if this is a write to the sysctl file
3041  * @buffer: the user buffer
3042  * @lenp: the size of the user buffer
3043  * @ppos: file position
3044  * @ppos: the current position in the file
3045  *
3046  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3047  * values from/to the user buffer, treated as an ASCII string.
3048  * The values read are assumed to be in 1/1000 seconds, and
3049  * are converted into jiffies.
3050  *
3051  * Returns 0 on success.
3052  */
3053 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3054                              void __user *buffer, size_t *lenp, loff_t *ppos)
3055 {
3056         return do_proc_dointvec(table, write, buffer, lenp, ppos,
3057                                 do_proc_dointvec_ms_jiffies_conv, NULL);
3058 }
3059
3060 static int proc_do_cad_pid(struct ctl_table *table, int write,
3061                            void __user *buffer, size_t *lenp, loff_t *ppos)
3062 {
3063         struct pid *new_pid;
3064         pid_t tmp;
3065         int r;
3066
3067         tmp = pid_vnr(cad_pid);
3068
3069         r = __do_proc_dointvec(&tmp, table, write, buffer,
3070                                lenp, ppos, NULL, NULL);
3071         if (r || !write)
3072                 return r;
3073
3074         new_pid = find_get_pid(tmp);
3075         if (!new_pid)
3076                 return -ESRCH;
3077
3078         put_pid(xchg(&cad_pid, new_pid));
3079         return 0;
3080 }
3081
3082 /**
3083  * proc_do_large_bitmap - read/write from/to a large bitmap
3084  * @table: the sysctl table
3085  * @write: %TRUE if this is a write to the sysctl file
3086  * @buffer: the user buffer
3087  * @lenp: the size of the user buffer
3088  * @ppos: file position
3089  *
3090  * The bitmap is stored at table->data and the bitmap length (in bits)
3091  * in table->maxlen.
3092  *
3093  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3094  * large bitmaps may be represented in a compact manner. Writing into
3095  * the file will clear the bitmap then update it with the given input.
3096  *
3097  * Returns 0 on success.
3098  */
3099 int proc_do_large_bitmap(struct ctl_table *table, int write,
3100                          void __user *buffer, size_t *lenp, loff_t *ppos)
3101 {
3102         int err = 0;
3103         bool first = 1;
3104         size_t left = *lenp;
3105         unsigned long bitmap_len = table->maxlen;
3106         unsigned long *bitmap = *(unsigned long **) table->data;
3107         unsigned long *tmp_bitmap = NULL;
3108         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3109
3110         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3111                 *lenp = 0;
3112                 return 0;
3113         }
3114
3115         if (write) {
3116                 char *kbuf, *p;
3117
3118                 if (left > PAGE_SIZE - 1)
3119                         left = PAGE_SIZE - 1;
3120
3121                 p = kbuf = memdup_user_nul(buffer, left);
3122                 if (IS_ERR(kbuf))
3123                         return PTR_ERR(kbuf);
3124
3125                 tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len),
3126                                      sizeof(unsigned long),
3127                                      GFP_KERNEL);
3128                 if (!tmp_bitmap) {
3129                         kfree(kbuf);
3130                         return -ENOMEM;
3131                 }
3132                 proc_skip_char(&p, &left, '\n');
3133                 while (!err && left) {
3134                         unsigned long val_a, val_b;
3135                         bool neg;
3136
3137                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3138                                              sizeof(tr_a), &c);
3139                         if (err)
3140                                 break;
3141                         if (val_a >= bitmap_len || neg) {
3142                                 err = -EINVAL;
3143                                 break;
3144                         }
3145
3146                         val_b = val_a;
3147                         if (left) {
3148                                 p++;
3149                                 left--;
3150                         }
3151
3152                         if (c == '-') {
3153                                 err = proc_get_long(&p, &left, &val_b,
3154                                                      &neg, tr_b, sizeof(tr_b),
3155                                                      &c);
3156                                 if (err)
3157                                         break;
3158                                 if (val_b >= bitmap_len || neg ||
3159                                     val_a > val_b) {
3160                                         err = -EINVAL;
3161                                         break;
3162                                 }
3163                                 if (left) {
3164                                         p++;
3165                                         left--;
3166                                 }
3167                         }
3168
3169                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3170                         first = 0;
3171                         proc_skip_char(&p, &left, '\n');
3172                 }
3173                 kfree(kbuf);
3174         } else {
3175                 unsigned long bit_a, bit_b = 0;
3176
3177                 while (left) {
3178                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3179                         if (bit_a >= bitmap_len)
3180                                 break;
3181                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
3182                                                    bit_a + 1) - 1;
3183
3184                         if (!first) {
3185                                 err = proc_put_char(&buffer, &left, ',');
3186                                 if (err)
3187                                         break;
3188                         }
3189                         err = proc_put_long(&buffer, &left, bit_a, false);
3190                         if (err)
3191                                 break;
3192                         if (bit_a != bit_b) {
3193                                 err = proc_put_char(&buffer, &left, '-');
3194                                 if (err)
3195                                         break;
3196                                 err = proc_put_long(&buffer, &left, bit_b, false);
3197                                 if (err)
3198                                         break;
3199                         }
3200
3201                         first = 0; bit_b++;
3202                 }
3203                 if (!err)
3204                         err = proc_put_char(&buffer, &left, '\n');
3205         }
3206
3207         if (!err) {
3208                 if (write) {
3209                         if (*ppos)
3210                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3211                         else
3212                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3213                 }
3214                 *lenp -= left;
3215                 *ppos += *lenp;
3216         }
3217
3218         kfree(tmp_bitmap);
3219         return err;
3220 }
3221
3222 #else /* CONFIG_PROC_SYSCTL */
3223
3224 int proc_dostring(struct ctl_table *table, int write,
3225                   void __user *buffer, size_t *lenp, loff_t *ppos)
3226 {
3227         return -ENOSYS;
3228 }
3229
3230 int proc_dointvec(struct ctl_table *table, int write,
3231                   void __user *buffer, size_t *lenp, loff_t *ppos)
3232 {
3233         return -ENOSYS;
3234 }
3235
3236 int proc_douintvec(struct ctl_table *table, int write,
3237                   void __user *buffer, size_t *lenp, loff_t *ppos)
3238 {
3239         return -ENOSYS;
3240 }
3241
3242 int proc_dointvec_minmax(struct ctl_table *table, int write,
3243                     void __user *buffer, size_t *lenp, loff_t *ppos)
3244 {
3245         return -ENOSYS;
3246 }
3247
3248 int proc_douintvec_minmax(struct ctl_table *table, int write,
3249                           void __user *buffer, size_t *lenp, loff_t *ppos)
3250 {
3251         return -ENOSYS;
3252 }
3253
3254 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3255                     void __user *buffer, size_t *lenp, loff_t *ppos)
3256 {
3257         return -ENOSYS;
3258 }
3259
3260 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3261                     void __user *buffer, size_t *lenp, loff_t *ppos)
3262 {
3263         return -ENOSYS;
3264 }
3265
3266 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3267                              void __user *buffer, size_t *lenp, loff_t *ppos)
3268 {
3269         return -ENOSYS;
3270 }
3271
3272 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3273                     void __user *buffer, size_t *lenp, loff_t *ppos)
3274 {
3275         return -ENOSYS;
3276 }
3277
3278 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3279                                       void __user *buffer,
3280                                       size_t *lenp, loff_t *ppos)
3281 {
3282     return -ENOSYS;
3283 }
3284
3285
3286 #endif /* CONFIG_PROC_SYSCTL */
3287
3288 #ifdef CONFIG_BPF_SYSCALL
3289 static int proc_dointvec_minmax_bpf_stats(struct ctl_table *table, int write,
3290                                           void __user *buffer, size_t *lenp,
3291                                           loff_t *ppos)
3292 {
3293         int ret, bpf_stats = *(int *)table->data;
3294         struct ctl_table tmp = *table;
3295
3296         if (write && !capable(CAP_SYS_ADMIN))
3297                 return -EPERM;
3298
3299         tmp.data = &bpf_stats;
3300         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3301         if (write && !ret) {
3302                 *(int *)table->data = bpf_stats;