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
 228 #ifdef CONFIG_MAGIC_SYSRQ
 229 /* Note: sysrq code uses its own private copy */
 230 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 231
 232 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 233                                 void __user *buffer, size_t *lenp,
 234                                 loff_t *ppos)
 235 {
 236         int error;
 237
 238         error = proc_dointvec(table, write, buffer, lenp, ppos);
 239         if (error)
 240                 return error;
 241
 242         if (write)
 243                 sysrq_toggle_support(__sysrq_enabled);
 244
 245         return 0;
 246 }
 247
 248 #endif
 249
 250 static struct ctl_table kern_table[];
 251 static struct ctl_table vm_table[];
 252 static struct ctl_table fs_table[];
 253 static struct ctl_table debug_table[];
 254 static struct ctl_table dev_table[];
 255 extern struct ctl_table random_table[];
 256 #ifdef CONFIG_EPOLL
 257 extern struct ctl_table epoll_table[];
 258 #endif
 259
 260 #ifdef CONFIG_FW_LOADER_USER_HELPER
 261 extern struct ctl_table firmware_config_table[];
 262 #endif
 263
 264 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 265 int sysctl_legacy_va_layout;
 266 #endif
 267
 268 /* The default sysctl tables: */
 269
 270 static struct ctl_table sysctl_base_table[] = {
 271         {
 272                 .procname       = "kernel",
 273                 .mode           = 0555,
 274                 .child          = kern_table,
 275         },
 276         {
 277                 .procname       = "vm",
 278                 .mode           = 0555,
 279                 .child          = vm_table,
 280         },
 281         {
 282                 .procname       = "fs",
 283                 .mode           = 0555,
 284                 .child          = fs_table,
 285         },
 286         {
 287                 .procname       = "debug",
 288                 .mode           = 0555,
 289                 .child          = debug_table,
 290         },
 291         {
 292                 .procname       = "dev",
 293                 .mode           = 0555,
 294                 .child          = dev_table,
 295         },
 296         { }
 297 };
 298
 299 #ifdef CONFIG_SCHED_DEBUG
 300 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 301 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 302 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 303 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 304 #ifdef CONFIG_SMP
 305 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 306 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 307 #endif /* CONFIG_SMP */
 308 #endif /* CONFIG_SCHED_DEBUG */
 309
 310 #ifdef CONFIG_COMPACTION
 311 static int min_extfrag_threshold;
 312 static int max_extfrag_threshold = 1000;
 313 #endif
 314
 315 static struct ctl_table kern_table[] = {
 316         {
 317                 .procname       = "sched_child_runs_first",
 318                 .data           = &sysctl_sched_child_runs_first,
 319                 .maxlen         = sizeof(unsigned int),
 320                 .mode           = 0644,
 321                 .proc_handler   = proc_dointvec,
 322         },
 323 #ifdef CONFIG_SCHED_DEBUG
 324         {
 325                 .procname       = "sched_min_granularity_ns",
 326                 .data           = &sysctl_sched_min_granularity,
 327                 .maxlen         = sizeof(unsigned int),
 328                 .mode           = 0644,
 329                 .proc_handler   = sched_proc_update_handler,
 330                 .extra1         = &min_sched_granularity_ns,
 331                 .extra2         = &max_sched_granularity_ns,
 332         },
 333         {
 334                 .procname       = "sched_latency_ns",
 335                 .data           = &sysctl_sched_latency,
 336                 .maxlen         = sizeof(unsigned int),
 337                 .mode           = 0644,
 338                 .proc_handler   = sched_proc_update_handler,
 339                 .extra1         = &min_sched_granularity_ns,
 340                 .extra2         = &max_sched_granularity_ns,
 341         },
 342         {
 343                 .procname       = "sched_wakeup_granularity_ns",
 344                 .data           = &sysctl_sched_wakeup_granularity,
 345                 .maxlen         = sizeof(unsigned int),
 346                 .mode           = 0644,
 347                 .proc_handler   = sched_proc_update_handler,
 348                 .extra1         = &min_wakeup_granularity_ns,
 349                 .extra2         = &max_wakeup_granularity_ns,
 350         },
 351 #ifdef CONFIG_SMP
 352         {
 353                 .procname       = "sched_tunable_scaling",
 354                 .data           = &sysctl_sched_tunable_scaling,
 355                 .maxlen         = sizeof(enum sched_tunable_scaling),
 356                 .mode           = 0644,
 357                 .proc_handler   = sched_proc_update_handler,
 358                 .extra1         = &min_sched_tunable_scaling,
 359                 .extra2         = &max_sched_tunable_scaling,
 360         },
 361         {
 362                 .procname       = "sched_migration_cost_ns",
 363                 .data           = &sysctl_sched_migration_cost,
 364                 .maxlen         = sizeof(unsigned int),
 365                 .mode           = 0644,
 366                 .proc_handler   = proc_dointvec,
 367         },
 368         {
 369                 .procname       = "sched_nr_migrate",
 370                 .data           = &sysctl_sched_nr_migrate,
 371                 .maxlen         = sizeof(unsigned int),
 372                 .mode           = 0644,
 373                 .proc_handler   = proc_dointvec,
 374         },
 375 #ifdef CONFIG_SCHEDSTATS
 376         {
 377                 .procname       = "sched_schedstats",
 378                 .data           = NULL,
 379                 .maxlen         = sizeof(unsigned int),
 380                 .mode           = 0644,
 381                 .proc_handler   = sysctl_schedstats,
 382                 .extra1         = &zero,
 383                 .extra2         = &one,
 384         },
 385 #endif /* CONFIG_SCHEDSTATS */
 386 #endif /* CONFIG_SMP */
 387 #ifdef CONFIG_NUMA_BALANCING
 388         {
 389                 .procname       = "numa_balancing_scan_delay_ms",
 390                 .data           = &sysctl_numa_balancing_scan_delay,
 391                 .maxlen         = sizeof(unsigned int),
 392                 .mode           = 0644,
 393                 .proc_handler   = proc_dointvec,
 394         },
 395         {
 396                 .procname       = "numa_balancing_scan_period_min_ms",
 397                 .data           = &sysctl_numa_balancing_scan_period_min,
 398                 .maxlen         = sizeof(unsigned int),
 399                 .mode           = 0644,
 400                 .proc_handler   = proc_dointvec,
 401         },
 402         {
 403                 .procname       = "numa_balancing_scan_period_max_ms",
 404                 .data           = &sysctl_numa_balancing_scan_period_max,
 405                 .maxlen         = sizeof(unsigned int),
 406                 .mode           = 0644,
 407                 .proc_handler   = proc_dointvec,
 408         },
 409         {
 410                 .procname       = "numa_balancing_scan_size_mb",
 411                 .data           = &sysctl_numa_balancing_scan_size,
 412                 .maxlen         = sizeof(unsigned int),
 413                 .mode           = 0644,
 414                 .proc_handler   = proc_dointvec_minmax,
 415                 .extra1         = &one,
 416         },
 417         {
 418                 .procname       = "numa_balancing",
 419                 .data           = NULL, /* filled in by handler */
 420                 .maxlen         = sizeof(unsigned int),
 421                 .mode           = 0644,
 422                 .proc_handler   = sysctl_numa_balancing,
 423                 .extra1         = &zero,
 424                 .extra2         = &one,
 425         },
 426 #endif /* CONFIG_NUMA_BALANCING */
 427 #endif /* CONFIG_SCHED_DEBUG */
 428         {
 429                 .procname       = "sched_rt_period_us",
 430                 .data           = &sysctl_sched_rt_period,
 431                 .maxlen         = sizeof(unsigned int),
 432                 .mode           = 0644,
 433                 .proc_handler   = sched_rt_handler,
 434         },
 435         {
 436                 .procname       = "sched_rt_runtime_us",
 437                 .data           = &sysctl_sched_rt_runtime,
 438                 .maxlen         = sizeof(int),
 439                 .mode           = 0644,
 440                 .proc_handler   = sched_rt_handler,
 441         },
 442         {
 443                 .procname       = "sched_rr_timeslice_ms",
 444                 .data           = &sysctl_sched_rr_timeslice,
 445                 .maxlen         = sizeof(int),
 446                 .mode           = 0644,
 447                 .proc_handler   = sched_rr_handler,
 448         },
 449 #ifdef CONFIG_SCHED_AUTOGROUP
 450         {
 451                 .procname       = "sched_autogroup_enabled",
 452                 .data           = &sysctl_sched_autogroup_enabled,
 453                 .maxlen         = sizeof(unsigned int),
 454                 .mode           = 0644,
 455                 .proc_handler   = proc_dointvec_minmax,
 456                 .extra1         = &zero,
 457                 .extra2         = &one,
 458         },
 459 #endif
 460 #ifdef CONFIG_CFS_BANDWIDTH
 461         {
 462                 .procname       = "sched_cfs_bandwidth_slice_us",
 463                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 464                 .maxlen         = sizeof(unsigned int),
 465                 .mode           = 0644,
 466                 .proc_handler   = proc_dointvec_minmax,
 467                 .extra1         = &one,
 468         },
 469 #endif
 470 #ifdef CONFIG_PROVE_LOCKING
 471         {
 472                 .procname       = "prove_locking",
 473                 .data           = &prove_locking,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = proc_dointvec,
 477         },
 478 #endif
 479 #ifdef CONFIG_LOCK_STAT
 480         {
 481                 .procname       = "lock_stat",
 482                 .data           = &lock_stat,
 483                 .maxlen         = sizeof(int),
 484                 .mode           = 0644,
 485                 .proc_handler   = proc_dointvec,
 486         },
 487 #endif
 488         {
 489                 .procname       = "panic",
 490                 .data           = &panic_timeout,
 491                 .maxlen         = sizeof(int),
 492                 .mode           = 0644,
 493                 .proc_handler   = proc_dointvec,
 494         },
 495 #ifdef CONFIG_COREDUMP
 496         {
 497                 .procname       = "core_uses_pid",
 498                 .data           = &core_uses_pid,
 499                 .maxlen         = sizeof(int),
 500                 .mode           = 0644,
 501                 .proc_handler   = proc_dointvec,
 502         },
 503         {
 504                 .procname       = "core_pattern",
 505                 .data           = core_pattern,
 506                 .maxlen         = CORENAME_MAX_SIZE,
 507                 .mode           = 0644,
 508                 .proc_handler   = proc_dostring_coredump,
 509         },
 510         {
 511                 .procname       = "core_pipe_limit",
 512                 .data           = &core_pipe_limit,
 513                 .maxlen         = sizeof(unsigned int),
 514                 .mode           = 0644,
 515                 .proc_handler   = proc_dointvec,
 516         },
 517 #endif
 518 #ifdef CONFIG_PROC_SYSCTL
 519         {
 520                 .procname       = "tainted",
 521                 .maxlen         = sizeof(long),
 522                 .mode           = 0644,
 523                 .proc_handler   = proc_taint,
 524         },
 525         {
 526                 .procname       = "sysctl_writes_strict",
 527                 .data           = &sysctl_writes_strict,
 528                 .maxlen         = sizeof(int),
 529                 .mode           = 0644,
 530                 .proc_handler   = proc_dointvec_minmax,
 531                 .extra1         = &neg_one,
 532                 .extra2         = &one,
 533         },
 534 #endif
 535 #ifdef CONFIG_LATENCYTOP
 536         {
 537                 .procname       = "latencytop",
 538                 .data           = &latencytop_enabled,
 539                 .maxlen         = sizeof(int),
 540                 .mode           = 0644,
 541                 .proc_handler   = sysctl_latencytop,
 542         },
 543 #endif
 544 #ifdef CONFIG_BLK_DEV_INITRD
 545         {
 546                 .procname       = "real-root-dev",
 547                 .data           = &real_root_dev,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_dointvec,
 551         },
 552 #endif
 553         {
 554                 .procname       = "print-fatal-signals",
 555                 .data           = &print_fatal_signals,
 556                 .maxlen         = sizeof(int),
 557                 .mode           = 0644,
 558                 .proc_handler   = proc_dointvec,
 559         },
 560 #ifdef CONFIG_SPARC
 561         {
 562                 .procname       = "reboot-cmd",
 563                 .data           = reboot_command,
 564                 .maxlen         = 256,
 565                 .mode           = 0644,
 566                 .proc_handler   = proc_dostring,
 567         },
 568         {
 569                 .procname       = "stop-a",
 570                 .data           = &stop_a_enabled,
 571                 .maxlen         = sizeof (int),
 572                 .mode           = 0644,
 573                 .proc_handler   = proc_dointvec,
 574         },
 575         {
 576                 .procname       = "scons-poweroff",
 577                 .data           = &scons_pwroff,
 578                 .maxlen         = sizeof (int),
 579                 .mode           = 0644,
 580                 .proc_handler   = proc_dointvec,
 581         },
 582 #endif
 583 #ifdef CONFIG_SPARC64
 584         {
 585                 .procname       = "tsb-ratio",
 586                 .data           = &sysctl_tsb_ratio,
 587                 .maxlen         = sizeof (int),
 588                 .mode           = 0644,
 589                 .proc_handler   = proc_dointvec,
 590         },
 591 #endif
 592 #ifdef __hppa__
 593         {
 594                 .procname       = "soft-power",
 595                 .data           = &pwrsw_enabled,
 596                 .maxlen         = sizeof (int),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dointvec,
 599         },
 600 #endif
 601 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 602         {
 603                 .procname       = "unaligned-trap",
 604                 .data           = &unaligned_enabled,
 605                 .maxlen         = sizeof (int),
 606                 .mode           = 0644,
 607                 .proc_handler   = proc_dointvec,
 608         },
 609 #endif
 610         {
 611                 .procname       = "ctrl-alt-del",
 612                 .data           = &C_A_D,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = proc_dointvec,
 616         },
 617 #ifdef CONFIG_FUNCTION_TRACER
 618         {
 619                 .procname       = "ftrace_enabled",
 620                 .data           = &ftrace_enabled,
 621                 .maxlen         = sizeof(int),
 622                 .mode           = 0644,
 623                 .proc_handler   = ftrace_enable_sysctl,
 624         },
 625 #endif
 626 #ifdef CONFIG_STACK_TRACER
 627         {
 628                 .procname       = "stack_tracer_enabled",
 629                 .data           = &stack_tracer_enabled,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 .proc_handler   = stack_trace_sysctl,
 633         },
 634 #endif
 635 #ifdef CONFIG_TRACING
 636         {
 637                 .procname       = "ftrace_dump_on_oops",
 638                 .data           = &ftrace_dump_on_oops,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 .proc_handler   = proc_dointvec,
 642         },
 643         {
 644                 .procname       = "traceoff_on_warning",
 645                 .data           = &__disable_trace_on_warning,
 646                 .maxlen         = sizeof(__disable_trace_on_warning),
 647                 .mode           = 0644,
 648                 .proc_handler   = proc_dointvec,
 649         },
 650         {
 651                 .procname       = "tracepoint_printk",
 652                 .data           = &tracepoint_printk,
 653                 .maxlen         = sizeof(tracepoint_printk),
 654                 .mode           = 0644,
 655                 .proc_handler   = tracepoint_printk_sysctl,
 656         },
 657 #endif
 658 #ifdef CONFIG_KEXEC_CORE
 659         {
 660                 .procname       = "kexec_load_disabled",
 661                 .data           = &kexec_load_disabled,
 662                 .maxlen         = sizeof(int),
 663                 .mode           = 0644,
 664                 /* only handle a transition from default "0" to "1" */
 665                 .proc_handler   = proc_dointvec_minmax,
 666                 .extra1         = &one,
 667                 .extra2         = &one,
 668         },
 669 #endif
 670 #ifdef CONFIG_MODULES
 671         {
 672                 .procname       = "modprobe",
 673                 .data           = &modprobe_path,
 674                 .maxlen         = KMOD_PATH_LEN,
 675                 .mode           = 0644,
 676                 .proc_handler   = proc_dostring,
 677         },
 678         {
 679                 .procname       = "modules_disabled",
 680                 .data           = &modules_disabled,
 681                 .maxlen         = sizeof(int),
 682                 .mode           = 0644,
 683                 /* only handle a transition from default "0" to "1" */
 684                 .proc_handler   = proc_dointvec_minmax,
 685                 .extra1         = &one,
 686                 .extra2         = &one,
 687         },
 688 #endif
 689 #ifdef CONFIG_UEVENT_HELPER
 690         {
 691                 .procname       = "hotplug",
 692                 .data           = &uevent_helper,
 693                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 694                 .mode           = 0644,
 695                 .proc_handler   = proc_dostring,
 696         },
 697 #endif
 698 #ifdef CONFIG_CHR_DEV_SG
 699         {
 700                 .procname       = "sg-big-buff",
 701                 .data           = &sg_big_buff,
 702                 .maxlen         = sizeof (int),
 703                 .mode           = 0444,
 704                 .proc_handler   = proc_dointvec,
 705         },
 706 #endif
 707 #ifdef CONFIG_BSD_PROCESS_ACCT
 708         {
 709                 .procname       = "acct",
 710                 .data           = &acct_parm,
 711                 .maxlen         = 3*sizeof(int),
 712                 .mode           = 0644,
 713                 .proc_handler   = proc_dointvec,
 714         },
 715 #endif
 716 #ifdef CONFIG_MAGIC_SYSRQ
 717         {
 718                 .procname       = "sysrq",
 719                 .data           = &__sysrq_enabled,
 720                 .maxlen         = sizeof (int),
 721                 .mode           = 0644,
 722                 .proc_handler   = sysrq_sysctl_handler,
 723         },
 724 #endif
 725 #ifdef CONFIG_PROC_SYSCTL
 726         {
 727                 .procname       = "cad_pid",
 728                 .data           = NULL,
 729                 .maxlen         = sizeof (int),
 730                 .mode           = 0600,
 731                 .proc_handler   = proc_do_cad_pid,
 732         },
 733 #endif
 734         {
 735                 .procname       = "threads-max",
 736                 .data           = NULL,
 737                 .maxlen         = sizeof(int),
 738                 .mode           = 0644,
 739                 .proc_handler   = sysctl_max_threads,
 740         },
 741         {
 742                 .procname       = "random",
 743                 .mode           = 0555,
 744                 .child          = random_table,
 745         },
 746         {
 747                 .procname       = "usermodehelper",
 748                 .mode           = 0555,
 749                 .child          = usermodehelper_table,
 750         },
 751 #ifdef CONFIG_FW_LOADER_USER_HELPER
 752         {
 753                 .procname       = "firmware_config",
 754                 .mode           = 0555,
 755                 .child          = firmware_config_table,
 756         },
 757 #endif
 758         {
 759                 .procname       = "overflowuid",
 760                 .data           = &overflowuid,
 761                 .maxlen         = sizeof(int),
 762                 .mode           = 0644,
 763                 .proc_handler   = proc_dointvec_minmax,
 764                 .extra1         = &minolduid,
 765                 .extra2         = &maxolduid,
 766         },
 767         {
 768                 .procname       = "overflowgid",
 769                 .data           = &overflowgid,
 770                 .maxlen         = sizeof(int),
 771                 .mode           = 0644,
 772                 .proc_handler   = proc_dointvec_minmax,
 773                 .extra1         = &minolduid,
 774                 .extra2         = &maxolduid,
 775         },
 776 #ifdef CONFIG_S390
 777 #ifdef CONFIG_MATHEMU
 778         {
 779                 .procname       = "ieee_emulation_warnings",
 780                 .data           = &sysctl_ieee_emulation_warnings,
 781                 .maxlen         = sizeof(int),
 782                 .mode           = 0644,
 783                 .proc_handler   = proc_dointvec,
 784         },
 785 #endif
 786         {
 787                 .procname       = "userprocess_debug",
 788                 .data           = &show_unhandled_signals,
 789                 .maxlen         = sizeof(int),
 790                 .mode           = 0644,
 791                 .proc_handler   = proc_dointvec,
 792         },
 793 #endif
 794         {
 795                 .procname       = "pid_max",
 796                 .data           = &pid_max,
 797                 .maxlen         = sizeof (int),
 798                 .mode           = 0644,
 799                 .proc_handler   = proc_dointvec_minmax,
 800                 .extra1         = &pid_max_min,
 801                 .extra2         = &pid_max_max,
 802         },
 803         {
 804                 .procname       = "panic_on_oops",
 805                 .data           = &panic_on_oops,
 806                 .maxlen         = sizeof(int),
 807                 .mode           = 0644,
 808                 .proc_handler   = proc_dointvec,
 809         },
 810         {
 811                 .procname       = "panic_print",
 812                 .data           = &panic_print,
 813                 .maxlen         = sizeof(unsigned long),
 814                 .mode           = 0644,
 815                 .proc_handler   = proc_doulongvec_minmax,
 816         },
 817 #if defined CONFIG_PRINTK
 818         {
 819                 .procname       = "printk",
 820                 .data           = &console_loglevel,
 821                 .maxlen         = 4*sizeof(int),
 822                 .mode           = 0644,
 823                 .proc_handler   = proc_dointvec,
 824         },
 825         {
 826                 .procname       = "printk_ratelimit",
 827                 .data           = &printk_ratelimit_state.interval,
 828                 .maxlen         = sizeof(int),
 829                 .mode           = 0644,
 830                 .proc_handler   = proc_dointvec_jiffies,
 831         },
 832         {
 833                 .procname       = "printk_ratelimit_burst",
 834                 .data           = &printk_ratelimit_state.burst,
 835                 .maxlen         = sizeof(int),
 836                 .mode           = 0644,
 837                 .proc_handler   = proc_dointvec,
 838         },
 839         {
 840                 .procname       = "printk_delay",
 841                 .data           = &printk_delay_msec,
 842                 .maxlen         = sizeof(int),
 843                 .mode           = 0644,
 844                 .proc_handler   = proc_dointvec_minmax,
 845                 .extra1         = &zero,
 846                 .extra2         = &ten_thousand,
 847         },
 848         {
 849                 .procname       = "printk_devkmsg",
 850                 .data           = devkmsg_log_str,
 851                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
 852                 .mode           = 0644,
 853                 .proc_handler   = devkmsg_sysctl_set_loglvl,
 854         },
 855         {
 856                 .procname       = "dmesg_restrict",
 857                 .data           = &dmesg_restrict,
 858                 .maxlen         = sizeof(int),
 859                 .mode           = 0644,
 860                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 861                 .extra1         = &zero,
 862                 .extra2         = &one,
 863         },
 864         {
 865                 .procname       = "kptr_restrict",
 866                 .data           = &kptr_restrict,
 867                 .maxlen         = sizeof(int),
 868                 .mode           = 0644,
 869                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 870                 .extra1         = &zero,
 871                 .extra2         = &two,
 872         },
 873 #endif
 874         {
 875                 .procname       = "ngroups_max",
 876                 .data           = &ngroups_max,
 877                 .maxlen         = sizeof (int),
 878                 .mode           = 0444,
 879                 .proc_handler   = proc_dointvec,
 880         },
 881         {
 882                 .procname       = "cap_last_cap",
 883                 .data           = (void *)&cap_last_cap,
 884                 .maxlen         = sizeof(int),
 885                 .mode           = 0444,
 886                 .proc_handler   = proc_dointvec,
 887         },
 888 #if defined(CONFIG_LOCKUP_DETECTOR)
 889         {
 890                 .procname       = "watchdog",
 891                 .data           = &watchdog_user_enabled,
 892                 .maxlen         = sizeof(int),
 893                 .mode           = 0644,
 894                 .proc_handler   = proc_watchdog,
 895                 .extra1         = &zero,
 896                 .extra2         = &one,
 897         },
 898         {
 899                 .procname       = "watchdog_thresh",
 900                 .data           = &watchdog_thresh,
 901                 .maxlen         = sizeof(int),
 902                 .mode           = 0644,
 903                 .proc_handler   = proc_watchdog_thresh,
 904                 .extra1         = &zero,
 905                 .extra2         = &sixty,
 906         },
 907         {
 908                 .procname       = "nmi_watchdog",
 909                 .data           = &nmi_watchdog_user_enabled,
 910                 .maxlen         = sizeof(int),
 911                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
 912                 .proc_handler   = proc_nmi_watchdog,
 913                 .extra1         = &zero,
 914                 .extra2         = &one,
 915         },
 916         {
 917                 .procname       = "watchdog_cpumask",
 918                 .data           = &watchdog_cpumask_bits,
 919                 .maxlen         = NR_CPUS,
 920                 .mode           = 0644,
 921                 .proc_handler   = proc_watchdog_cpumask,
 922         },
 923 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
 924         {
 925                 .procname       = "soft_watchdog",
 926                 .data           = &soft_watchdog_user_enabled,
 927                 .maxlen         = sizeof(int),
 928                 .mode           = 0644,
 929                 .proc_handler   = proc_soft_watchdog,
 930                 .extra1         = &zero,
 931                 .extra2         = &one,
 932         },
 933         {
 934                 .procname       = "softlockup_panic",
 935                 .data           = &softlockup_panic,
 936                 .maxlen         = sizeof(int),
 937                 .mode           = 0644,
 938                 .proc_handler   = proc_dointvec_minmax,
 939                 .extra1         = &zero,
 940                 .extra2         = &one,
 941         },
 942 #ifdef CONFIG_SMP
 943         {
 944                 .procname       = "softlockup_all_cpu_backtrace",
 945                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 946                 .maxlen         = sizeof(int),
 947                 .mode           = 0644,
 948                 .proc_handler   = proc_dointvec_minmax,
 949                 .extra1         = &zero,
 950                 .extra2         = &one,
 951         },
 952 #endif /* CONFIG_SMP */
 953 #endif
 954 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 955         {
 956                 .procname       = "hardlockup_panic",
 957                 .data           = &hardlockup_panic,
 958                 .maxlen         = sizeof(int),
 959                 .mode           = 0644,
 960                 .proc_handler   = proc_dointvec_minmax,
 961                 .extra1         = &zero,
 962                 .extra2         = &one,
 963         },
 964 #ifdef CONFIG_SMP
 965         {
 966                 .procname       = "hardlockup_all_cpu_backtrace",
 967                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
 968                 .maxlen         = sizeof(int),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_dointvec_minmax,
 971                 .extra1         = &zero,
 972                 .extra2         = &one,
 973         },
 974 #endif /* CONFIG_SMP */
 975 #endif
 976 #endif
 977
 978 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 979         {
 980                 .procname       = "unknown_nmi_panic",
 981                 .data           = &unknown_nmi_panic,
 982                 .maxlen         = sizeof (int),
 983                 .mode           = 0644,
 984                 .proc_handler   = proc_dointvec,
 985         },
 986 #endif
 987 #if defined(CONFIG_X86)
 988         {
 989                 .procname       = "panic_on_unrecovered_nmi",
 990                 .data           = &panic_on_unrecovered_nmi,
 991                 .maxlen         = sizeof(int),
 992                 .mode           = 0644,
 993                 .proc_handler   = proc_dointvec,
 994         },
 995         {
 996                 .procname       = "panic_on_io_nmi",
 997                 .data           = &panic_on_io_nmi,
 998                 .maxlen         = sizeof(int),
 999                 .mode           = 0644,
1000                 .proc_handler   = proc_dointvec,
1001         },
1002 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1003         {
1004                 .procname       = "panic_on_stackoverflow",
1005                 .data           = &sysctl_panic_on_stackoverflow,
1006                 .maxlen         = sizeof(int),
1007                 .mode           = 0644,
1008                 .proc_handler   = proc_dointvec,
1009         },
1010 #endif
1011         {
1012                 .procname       = "bootloader_type",
1013                 .data           = &bootloader_type,
1014                 .maxlen         = sizeof (int),
1015                 .mode           = 0444,
1016                 .proc_handler   = proc_dointvec,
1017         },
1018         {
1019                 .procname       = "bootloader_version",
1020                 .data           = &bootloader_version,
1021                 .maxlen         = sizeof (int),
1022                 .mode           = 0444,
1023                 .proc_handler   = proc_dointvec,
1024         },
1025         {
1026                 .procname       = "io_delay_type",
1027                 .data           = &io_delay_type,
1028                 .maxlen         = sizeof(int),
1029                 .mode           = 0644,
1030                 .proc_handler   = proc_dointvec,
1031         },
1032 #endif
1033 #if defined(CONFIG_MMU)
1034         {
1035                 .procname       = "randomize_va_space",
1036                 .data           = &randomize_va_space,
1037                 .maxlen         = sizeof(int),
1038                 .mode           = 0644,
1039                 .proc_handler   = proc_dointvec,
1040         },
1041 #endif
1042 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1043         {
1044                 .procname       = "spin_retry",
1045                 .data           = &spin_retry,
1046                 .maxlen         = sizeof (int),
1047                 .mode           = 0644,
1048                 .proc_handler   = proc_dointvec,
1049         },
1050 #endif
1051 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1052         {
1053                 .procname       = "acpi_video_flags",
1054                 .data           = &acpi_realmode_flags,
1055                 .maxlen         = sizeof (unsigned long),
1056                 .mode           = 0644,
1057                 .proc_handler   = proc_doulongvec_minmax,
1058         },
1059 #endif
1060 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1061         {
1062                 .procname       = "ignore-unaligned-usertrap",
1063                 .data           = &no_unaligned_warning,
1064                 .maxlen         = sizeof (int),
1065                 .mode           = 0644,
1066                 .proc_handler   = proc_dointvec,
1067         },
1068 #endif
1069 #ifdef CONFIG_IA64
1070         {
1071                 .procname       = "unaligned-dump-stack",
1072                 .data           = &unaligned_dump_stack,
1073                 .maxlen         = sizeof (int),
1074                 .mode           = 0644,
1075                 .proc_handler   = proc_dointvec,
1076         },
1077 #endif
1078 #ifdef CONFIG_DETECT_HUNG_TASK
1079         {
1080                 .procname       = "hung_task_panic",
1081                 .data           = &sysctl_hung_task_panic,
1082                 .maxlen         = sizeof(int),
1083                 .mode           = 0644,
1084                 .proc_handler   = proc_dointvec_minmax,
1085                 .extra1         = &zero,
1086                 .extra2         = &one,
1087         },
1088         {
1089                 .procname       = "hung_task_check_count",
1090                 .data           = &sysctl_hung_task_check_count,
1091                 .maxlen         = sizeof(int),
1092                 .mode           = 0644,
1093                 .proc_handler   = proc_dointvec_minmax,
1094                 .extra1         = &zero,
1095         },
1096         {
1097                 .procname       = "hung_task_timeout_secs",
1098                 .data           = &sysctl_hung_task_timeout_secs,
1099                 .maxlen         = sizeof(unsigned long),
1100                 .mode           = 0644,
1101                 .proc_handler   = proc_dohung_task_timeout_secs,
1102                 .extra2         = &hung_task_timeout_max,
1103         },
1104         {
1105                 .procname       = "hung_task_check_interval_secs",
1106                 .data           = &sysctl_hung_task_check_interval_secs,
1107                 .maxlen         = sizeof(unsigned long),
1108                 .mode           = 0644,
1109                 .proc_handler   = proc_dohung_task_timeout_secs,
1110                 .extra2         = &hung_task_timeout_max,
1111         },
1112         {
1113                 .procname       = "hung_task_warnings",
1114                 .data           = &sysctl_hung_task_warnings,
1115                 .maxlen         = sizeof(int),
1116                 .mode           = 0644,
1117                 .proc_handler   = proc_dointvec_minmax,
1118                 .extra1         = &neg_one,
1119         },
1120 #endif
1121 #ifdef CONFIG_RT_MUTEXES
1122         {
1123                 .procname       = "max_lock_depth",
1124                 .data           = &max_lock_depth,
1125                 .maxlen         = sizeof(int),
1126                 .mode           = 0644,
1127                 .proc_handler   = proc_dointvec,
1128         },
1129 #endif
1130         {
1131                 .procname       = "poweroff_cmd",
1132                 .data           = &poweroff_cmd,
1133                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1134                 .mode           = 0644,
1135                 .proc_handler   = proc_dostring,
1136         },
1137 #ifdef CONFIG_KEYS
1138         {
1139                 .procname       = "keys",
1140                 .mode           = 0555,
1141                 .child          = key_sysctls,
1142         },
1143 #endif
1144 #ifdef CONFIG_PERF_EVENTS
1145         /*
1146          * User-space scripts rely on the existence of this file
1147          * as a feature check for perf_events being enabled.
1148          *
1149          * So it's an ABI, do not remove!
1150          */
1151         {
1152                 .procname       = "perf_event_paranoid",
1153                 .data           = &sysctl_perf_event_paranoid,
1154                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1155                 .mode           = 0644,
1156                 .proc_handler   = proc_dointvec,
1157         },
1158         {
1159                 .procname       = "perf_event_mlock_kb",
1160                 .data           = &sysctl_perf_event_mlock,
1161                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1162                 .mode           = 0644,
1163                 .proc_handler   = proc_dointvec,
1164         },
1165         {
1166                 .procname       = "perf_event_max_sample_rate",
1167                 .data           = &sysctl_perf_event_sample_rate,
1168                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1169                 .mode           = 0644,
1170                 .proc_handler   = perf_proc_update_handler,
1171                 .extra1         = &one,
1172         },
1173         {
1174                 .procname       = "perf_cpu_time_max_percent",
1175                 .data           = &sysctl_perf_cpu_time_max_percent,
1176                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1177                 .mode           = 0644,
1178                 .proc_handler   = perf_cpu_time_max_percent_handler,
1179                 .extra1         = &zero,
1180                 .extra2         = &one_hundred,
1181         },
1182         {
1183                 .procname       = "perf_event_max_stack",
1184                 .data           = &sysctl_perf_event_max_stack,
1185                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
1186                 .mode           = 0644,
1187                 .proc_handler   = perf_event_max_stack_handler,
1188                 .extra1         = &zero,
1189                 .extra2         = &six_hundred_forty_kb,
1190         },
1191         {
1192                 .procname       = "perf_event_max_contexts_per_stack",
1193                 .data           = &sysctl_perf_event_max_contexts_per_stack,
1194                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
1195                 .mode           = 0644,
1196                 .proc_handler   = perf_event_max_stack_handler,
1197                 .extra1         = &zero,
1198                 .extra2         = &one_thousand,
1199         },
1200 #endif
1201         {
1202                 .procname       = "panic_on_warn",
1203                 .data           = &panic_on_warn,
1204                 .maxlen         = sizeof(int),
1205                 .mode           = 0644,
1206                 .proc_handler   = proc_dointvec_minmax,
1207                 .extra1         = &zero,
1208                 .extra2         = &one,
1209         },
1210 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1211         {
1212                 .procname       = "timer_migration",
1213                 .data           = &sysctl_timer_migration,
1214                 .maxlen         = sizeof(unsigned int),
1215                 .mode           = 0644,
1216                 .proc_handler   = timer_migration_handler,
1217                 .extra1         = &zero,
1218                 .extra2         = &one,
1219         },
1220 #endif
1221 #ifdef CONFIG_BPF_SYSCALL
1222         {
1223                 .procname       = "unprivileged_bpf_disabled",
1224                 .data           = &sysctl_unprivileged_bpf_disabled,
1225                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
1226                 .mode           = 0644,
1227                 /* only handle a transition from default "0" to "1" */
1228                 .proc_handler   = proc_dointvec_minmax,
1229                 .extra1         = &one,
1230                 .extra2         = &one,
1231         },
1232 #endif
1233 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1234         {
1235                 .procname       = "panic_on_rcu_stall",
1236                 .data           = &sysctl_panic_on_rcu_stall,
1237                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
1238                 .mode           = 0644,
1239                 .proc_handler   = proc_dointvec_minmax,
1240                 .extra1         = &zero,
1241                 .extra2         = &one,
1242         },
1243 #endif
1244 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1245         {
1246                 .procname       = "stack_erasing",
1247                 .data           = NULL,
1248                 .maxlen         = sizeof(int),
1249                 .mode           = 0600,
1250                 .proc_handler   = stack_erasing_sysctl,
1251                 .extra1         = &zero,
1252                 .extra2         = &one,
1253         },
1254 #endif
1255         { }
1256 };
1257
1258 static struct ctl_table vm_table[] = {
1259         {
1260                 .procname       = "overcommit_memory",
1261                 .data           = &sysctl_overcommit_memory,
1262                 .maxlen         = sizeof(sysctl_overcommit_memory),
1263                 .mode           = 0644,
1264                 .proc_handler   = proc_dointvec_minmax,
1265                 .extra1         = &zero,
1266                 .extra2         = &two,
1267         },
1268         {
1269                 .procname       = "panic_on_oom",
1270                 .data           = &sysctl_panic_on_oom,
1271                 .maxlen         = sizeof(sysctl_panic_on_oom),
1272                 .mode           = 0644,
1273                 .proc_handler   = proc_dointvec_minmax,
1274                 .extra1         = &zero,
1275                 .extra2         = &two,
1276         },
1277         {
1278                 .procname       = "oom_kill_allocating_task",
1279                 .data           = &sysctl_oom_kill_allocating_task,
1280                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1281                 .mode           = 0644,
1282                 .proc_handler   = proc_dointvec,
1283         },
1284         {
1285                 .procname       = "oom_dump_tasks",
1286                 .data           = &sysctl_oom_dump_tasks,
1287                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1288                 .mode           = 0644,
1289                 .proc_handler   = proc_dointvec,
1290         },
1291         {
1292                 .procname       = "overcommit_ratio",
1293                 .data           = &sysctl_overcommit_ratio,
1294                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1295                 .mode           = 0644,
1296                 .proc_handler   = overcommit_ratio_handler,
1297         },
1298         {
1299                 .procname       = "overcommit_kbytes",
1300                 .data           = &sysctl_overcommit_kbytes,
1301                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1302                 .mode           = 0644,
1303                 .proc_handler   = overcommit_kbytes_handler,
1304         },
1305         {
1306                 .procname       = "page-cluster",
1307                 .data           = &page_cluster,
1308                 .maxlen         = sizeof(int),
1309                 .mode           = 0644,
1310                 .proc_handler   = proc_dointvec_minmax,
1311                 .extra1         = &zero,
1312         },
1313         {
1314                 .procname       = "dirty_background_ratio",
1315                 .data           = &dirty_background_ratio,
1316                 .maxlen         = sizeof(dirty_background_ratio),
1317                 .mode           = 0644,
1318                 .proc_handler   = dirty_background_ratio_handler,
1319                 .extra1         = &zero,
1320                 .extra2         = &one_hundred,
1321         },
1322         {
1323                 .procname       = "dirty_background_bytes",
1324                 .data           = &dirty_background_bytes,
1325                 .maxlen         = sizeof(dirty_background_bytes),
1326                 .mode           = 0644,
1327                 .proc_handler   = dirty_background_bytes_handler,
1328                 .extra1         = &one_ul,
1329         },
1330         {
1331                 .procname       = "dirty_ratio",
1332                 .data           = &vm_dirty_ratio,
1333                 .maxlen         = sizeof(vm_dirty_ratio),
1334                 .mode           = 0644,
1335                 .proc_handler   = dirty_ratio_handler,
1336                 .extra1         = &zero,
1337                 .extra2         = &one_hundred,
1338         },
1339         {
1340                 .procname       = "dirty_bytes",
1341                 .data           = &vm_dirty_bytes,
1342                 .maxlen         = sizeof(vm_dirty_bytes),
1343                 .mode           = 0644,
1344                 .proc_handler   = dirty_bytes_handler,
1345                 .extra1         = &dirty_bytes_min,
1346         },
1347         {
1348                 .procname       = "dirty_writeback_centisecs",
1349                 .data           = &dirty_writeback_interval,
1350                 .maxlen         = sizeof(dirty_writeback_interval),
1351                 .mode           = 0644,
1352                 .proc_handler   = dirty_writeback_centisecs_handler,
1353         },
1354         {
1355                 .procname       = "dirty_expire_centisecs",
1356                 .data           = &dirty_expire_interval,
1357                 .maxlen         = sizeof(dirty_expire_interval),
1358                 .mode           = 0644,
1359                 .proc_handler   = proc_dointvec_minmax,
1360                 .extra1         = &zero,
1361         },
1362         {
1363                 .procname       = "dirtytime_expire_seconds",
1364                 .data           = &dirtytime_expire_interval,
1365                 .maxlen         = sizeof(dirtytime_expire_interval),
1366                 .mode           = 0644,
1367                 .proc_handler   = dirtytime_interval_handler,
1368                 .extra1         = &zero,
1369         },
1370         {
1371                 .procname       = "swappiness",
1372                 .data           = &vm_swappiness,
1373                 .maxlen         = sizeof(vm_swappiness),
1374                 .mode           = 0644,
1375                 .proc_handler   = proc_dointvec_minmax,
1376                 .extra1         = &zero,
1377                 .extra2         = &one_hundred,
1378         },
1379 #ifdef CONFIG_HUGETLB_PAGE
1380         {
1381                 .procname       = "nr_hugepages",
1382                 .data           = NULL,
1383                 .maxlen         = sizeof(unsigned long),
1384                 .mode           = 0644,
1385                 .proc_handler   = hugetlb_sysctl_handler,
1386         },
1387 #ifdef CONFIG_NUMA
1388         {
1389                 .procname       = "nr_hugepages_mempolicy",
1390                 .data           = NULL,
1391                 .maxlen         = sizeof(unsigned long),
1392                 .mode           = 0644,
1393                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1394         },
1395         {
1396                 .procname               = "numa_stat",
1397                 .data                   = &sysctl_vm_numa_stat,
1398                 .maxlen                 = sizeof(int),
1399                 .mode                   = 0644,
1400                 .proc_handler   = sysctl_vm_numa_stat_handler,
1401                 .extra1                 = &zero,
1402                 .extra2                 = &one,
1403         },
1404 #endif
1405          {
1406                 .procname       = "hugetlb_shm_group",
1407                 .data           = &sysctl_hugetlb_shm_group,
1408                 .maxlen         = sizeof(gid_t),
1409                 .mode           = 0644,
1410                 .proc_handler   = proc_dointvec,
1411          },
1412         {
1413                 .procname       = "nr_overcommit_hugepages",
1414                 .data           = NULL,
1415                 .maxlen         = sizeof(unsigned long),
1416                 .mode           = 0644,
1417                 .proc_handler   = hugetlb_overcommit_handler,
1418         },
1419 #endif
1420         {
1421                 .procname       = "lowmem_reserve_ratio",
1422                 .data           = &sysctl_lowmem_reserve_ratio,
1423                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1424                 .mode           = 0644,
1425                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1426         },
1427         {
1428                 .procname       = "drop_caches",
1429                 .data           = &sysctl_drop_caches,
1430                 .maxlen         = sizeof(int),
1431                 .mode           = 0644,
1432                 .proc_handler   = drop_caches_sysctl_handler,
1433                 .extra1         = &one,
1434                 .extra2         = &four,
1435         },
1436 #ifdef CONFIG_COMPACTION
1437         {
1438                 .procname       = "compact_memory",
1439                 .data           = &sysctl_compact_memory,
1440                 .maxlen         = sizeof(int),
1441                 .mode           = 0200,
1442                 .proc_handler   = sysctl_compaction_handler,
1443         },
1444         {
1445                 .procname       = "extfrag_threshold",
1446                 .data           = &sysctl_extfrag_threshold,
1447                 .maxlen         = sizeof(int),
1448                 .mode           = 0644,
1449                 .proc_handler   = sysctl_extfrag_handler,
1450                 .extra1         = &min_extfrag_threshold,
1451                 .extra2         = &max_extfrag_threshold,
1452         },
1453         {
1454                 .procname       = "compact_unevictable_allowed",
1455                 .data           = &sysctl_compact_unevictable_allowed,
1456                 .maxlen         = sizeof(int),
1457                 .mode           = 0644,
1458                 .proc_handler   = proc_dointvec,
1459                 .extra1         = &zero,
1460                 .extra2         = &one,
1461         },
1462
1463 #endif /* CONFIG_COMPACTION */
1464         {
1465                 .procname       = "min_free_kbytes",
1466                 .data           = &min_free_kbytes,
1467                 .maxlen         = sizeof(min_free_kbytes),
1468                 .mode           = 0644,
1469                 .proc_handler   = min_free_kbytes_sysctl_handler,
1470                 .extra1         = &zero,
1471         },
1472         {
1473                 .procname       = "watermark_boost_factor",
1474                 .data           = &watermark_boost_factor,
1475                 .maxlen         = sizeof(watermark_boost_factor),
1476                 .mode           = 0644,
1477                 .proc_handler   = watermark_boost_factor_sysctl_handler,
1478                 .extra1         = &zero,
1479         },
1480         {
1481                 .procname       = "watermark_scale_factor",
1482                 .data           = &watermark_scale_factor,
1483                 .maxlen         = sizeof(watermark_scale_factor),
1484                 .mode           = 0644,
1485                 .proc_handler   = watermark_scale_factor_sysctl_handler,
1486                 .extra1         = &one,
1487                 .extra2         = &one_thousand,
1488         },
1489         {
1490                 .procname       = "percpu_pagelist_fraction",
1491                 .data           = &percpu_pagelist_fraction,
1492                 .maxlen         = sizeof(percpu_pagelist_fraction),
1493                 .mode           = 0644,
1494                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1495                 .extra1         = &zero,
1496         },
1497 #ifdef CONFIG_MMU
1498         {
1499                 .procname       = "max_map_count",
1500                 .data           = &sysctl_max_map_count,
1501                 .maxlen         = sizeof(sysctl_max_map_count),
1502                 .mode           = 0644,
1503                 .proc_handler   = proc_dointvec_minmax,
1504                 .extra1         = &zero,
1505         },
1506 #else
1507         {
1508                 .procname       = "nr_trim_pages",
1509                 .data           = &sysctl_nr_trim_pages,
1510                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1511                 .mode           = 0644,
1512                 .proc_handler   = proc_dointvec_minmax,
1513                 .extra1         = &zero,
1514         },
1515 #endif
1516         {
1517                 .procname       = "laptop_mode",
1518                 .data           = &laptop_mode,
1519                 .maxlen         = sizeof(laptop_mode),
1520                 .mode           = 0644,
1521                 .proc_handler   = proc_dointvec_jiffies,
1522         },
1523         {
1524                 .procname       = "block_dump",
1525                 .data           = &block_dump,
1526                 .maxlen         = sizeof(block_dump),
1527                 .mode           = 0644,
1528                 .proc_handler   = proc_dointvec,
1529                 .extra1         = &zero,
1530         },
1531         {
1532                 .procname       = "vfs_cache_pressure",
1533                 .data           = &sysctl_vfs_cache_pressure,
1534                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1535                 .mode           = 0644,
1536                 .proc_handler   = proc_dointvec,
1537                 .extra1         = &zero,
1538         },
1539 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1540         {
1541                 .procname       = "legacy_va_layout",
1542                 .data           = &sysctl_legacy_va_layout,
1543                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1544                 .mode           = 0644,
1545                 .proc_handler   = proc_dointvec,
1546                 .extra1         = &zero,
1547         },
1548 #endif
1549 #ifdef CONFIG_NUMA
1550         {
1551                 .procname       = "zone_reclaim_mode",
1552                 .data           = &node_reclaim_mode,
1553                 .maxlen         = sizeof(node_reclaim_mode),
1554                 .mode           = 0644,
1555                 .proc_handler   = proc_dointvec,
1556                 .extra1         = &zero,
1557         },
1558         {
1559                 .procname       = "min_unmapped_ratio",
1560                 .data           = &sysctl_min_unmapped_ratio,
1561                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1562                 .mode           = 0644,
1563                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1564                 .extra1         = &zero,
1565                 .extra2         = &one_hundred,
1566         },
1567         {
1568                 .procname       = "min_slab_ratio",
1569                 .data           = &sysctl_min_slab_ratio,
1570                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1571                 .mode           = 0644,
1572                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1573                 .extra1         = &zero,
1574                 .extra2         = &one_hundred,
1575         },
1576 #endif
1577 #ifdef CONFIG_SMP
1578         {
1579                 .procname       = "stat_interval",
1580                 .data           = &sysctl_stat_interval,
1581                 .maxlen         = sizeof(sysctl_stat_interval),
1582                 .mode           = 0644,
1583                 .proc_handler   = proc_dointvec_jiffies,
1584         },
1585         {
1586                 .procname       = "stat_refresh",
1587                 .data           = NULL,
1588                 .maxlen         = 0,
1589                 .mode           = 0600,
1590                 .proc_handler   = vmstat_refresh,
1591         },
1592 #endif
1593 #ifdef CONFIG_MMU
1594         {
1595                 .procname       = "mmap_min_addr",
1596                 .data           = &dac_mmap_min_addr,
1597                 .maxlen         = sizeof(unsigned long),
1598                 .mode           = 0644,
1599                 .proc_handler   = mmap_min_addr_handler,
1600         },
1601 #endif
1602 #ifdef CONFIG_NUMA
1603         {
1604                 .procname       = "numa_zonelist_order",
1605                 .data           = &numa_zonelist_order,
1606                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1607                 .mode           = 0644,
1608                 .proc_handler   = numa_zonelist_order_handler,
1609         },
1610 #endif
1611 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1612    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1613         {
1614                 .procname       = "vdso_enabled",
1615 #ifdef CONFIG_X86_32
1616                 .data           = &vdso32_enabled,
1617                 .maxlen         = sizeof(vdso32_enabled),
1618 #else
1619                 .data           = &vdso_enabled,
1620                 .maxlen         = sizeof(vdso_enabled),
1621 #endif
1622                 .mode           = 0644,
1623                 .proc_handler   = proc_dointvec,
1624                 .extra1         = &zero,
1625         },
1626 #endif
1627 #ifdef CONFIG_HIGHMEM
1628         {
1629                 .procname       = "highmem_is_dirtyable",
1630                 .data           = &vm_highmem_is_dirtyable,
1631                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1632                 .mode           = 0644,
1633                 .proc_handler   = proc_dointvec_minmax,
1634                 .extra1         = &zero,
1635                 .extra2         = &one,
1636         },
1637 #endif
1638 #ifdef CONFIG_MEMORY_FAILURE
1639         {
1640                 .procname       = "memory_failure_early_kill",
1641                 .data           = &sysctl_memory_failure_early_kill,
1642                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1643                 .mode           = 0644,
1644                 .proc_handler   = proc_dointvec_minmax,
1645                 .extra1         = &zero,
1646                 .extra2         = &one,
1647         },
1648         {
1649                 .procname       = "memory_failure_recovery",
1650                 .data           = &sysctl_memory_failure_recovery,
1651                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1652                 .mode           = 0644,
1653                 .proc_handler   = proc_dointvec_minmax,
1654                 .extra1         = &zero,
1655                 .extra2         = &one,
1656         },
1657 #endif
1658         {
1659                 .procname       = "user_reserve_kbytes",
1660                 .data           = &sysctl_user_reserve_kbytes,
1661                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1662                 .mode           = 0644,
1663                 .proc_handler   = proc_doulongvec_minmax,
1664         },
1665         {
1666                 .procname       = "admin_reserve_kbytes",
1667                 .data           = &sysctl_admin_reserve_kbytes,
1668                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1669                 .mode           = 0644,
1670                 .proc_handler   = proc_doulongvec_minmax,
1671         },
1672 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1673         {
1674                 .procname       = "mmap_rnd_bits",
1675                 .data           = &mmap_rnd_bits,
1676                 .maxlen         = sizeof(mmap_rnd_bits),
1677                 .mode           = 0600,
1678                 .proc_handler   = proc_dointvec_minmax,
1679                 .extra1         = (void *)&mmap_rnd_bits_min,
1680                 .extra2         = (void *)&mmap_rnd_bits_max,
1681         },
1682 #endif
1683 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1684         {
1685                 .procname       = "mmap_rnd_compat_bits",
1686                 .data           = &mmap_rnd_compat_bits,
1687                 .maxlen         = sizeof(mmap_rnd_compat_bits),
1688                 .mode           = 0600,
1689                 .proc_handler   = proc_dointvec_minmax,
1690                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
1691                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
1692         },
1693 #endif
1694         { }
1695 };
1696
1697 static struct ctl_table fs_table[] = {
1698         {
1699                 .procname       = "inode-nr",
1700                 .data           = &inodes_stat,
1701                 .maxlen         = 2*sizeof(long),
1702                 .mode           = 0444,
1703                 .proc_handler   = proc_nr_inodes,
1704         },
1705         {
1706                 .procname       = "inode-state",
1707                 .data           = &inodes_stat,
1708                 .maxlen         = 7*sizeof(long),
1709                 .mode           = 0444,
1710                 .proc_handler   = proc_nr_inodes,
1711         },
1712         {
1713                 .procname       = "file-nr",
1714                 .data           = &files_stat,
1715                 .maxlen         = sizeof(files_stat),
1716                 .mode           = 0444,
1717                 .proc_handler   = proc_nr_files,
1718         },
1719         {
1720                 .procname       = "file-max",
1721                 .data           = &files_stat.max_files,
1722                 .maxlen         = sizeof(files_stat.max_files),
1723                 .mode           = 0644,
1724                 .proc_handler   = proc_doulongvec_minmax,
1725         },
1726         {
1727                 .procname       = "nr_open",
1728                 .data           = &sysctl_nr_open,
1729                 .maxlen         = sizeof(unsigned int),
1730                 .mode           = 0644,
1731                 .proc_handler   = proc_dointvec_minmax,
1732                 .extra1         = &sysctl_nr_open_min,
1733                 .extra2         = &sysctl_nr_open_max,
1734         },
1735         {
1736                 .procname       = "dentry-state",
1737                 .data           = &dentry_stat,
1738                 .maxlen         = 6*sizeof(long),
1739                 .mode           = 0444,
1740                 .proc_handler   = proc_nr_dentry,
1741         },
1742         {
1743                 .procname       = "overflowuid",
1744                 .data           = &fs_overflowuid,
1745                 .maxlen         = sizeof(int),
1746                 .mode           = 0644,
1747                 .proc_handler   = proc_dointvec_minmax,
1748                 .extra1         = &minolduid,
1749                 .extra2         = &maxolduid,
1750         },
1751         {
1752                 .procname       = "overflowgid",
1753                 .data           = &fs_overflowgid,
1754                 .maxlen         = sizeof(int),
1755                 .mode           = 0644,
1756                 .proc_handler   = proc_dointvec_minmax,
1757                 .extra1         = &minolduid,
1758                 .extra2         = &maxolduid,
1759         },
1760 #ifdef CONFIG_FILE_LOCKING
1761         {
1762                 .procname       = "leases-enable",
1763                 .data           = &leases_enable,
1764                 .maxlen         = sizeof(int),
1765                 .mode           = 0644,
1766                 .proc_handler   = proc_dointvec,
1767         },
1768 #endif
1769 #ifdef CONFIG_DNOTIFY
1770         {
1771                 .procname       = "dir-notify-enable",
1772                 .data           = &dir_notify_enable,
1773                 .maxlen         = sizeof(int),
1774                 .mode           = 0644,
1775                 .proc_handler   = proc_dointvec,
1776         },
1777 #endif
1778 #ifdef CONFIG_MMU
1779 #ifdef CONFIG_FILE_LOCKING
1780         {
1781                 .procname       = "lease-break-time",
1782                 .data           = &lease_break_time,
1783                 .maxlen         = sizeof(int),
1784                 .mode           = 0644,
1785                 .proc_handler   = proc_dointvec,
1786         },
1787 #endif
1788 #ifdef CONFIG_AIO
1789         {
1790                 .procname       = "aio-nr",
1791                 .data           = &aio_nr,
1792                 .maxlen         = sizeof(aio_nr),
1793                 .mode           = 0444,
1794                 .proc_handler   = proc_doulongvec_minmax,
1795         },
1796         {
1797                 .procname       = "aio-max-nr",
1798                 .data           = &aio_max_nr,
1799                 .maxlen         = sizeof(aio_max_nr),
1800                 .mode           = 0644,
1801                 .proc_handler   = proc_doulongvec_minmax,
1802         },
1803 #endif /* CONFIG_AIO */
1804 #ifdef CONFIG_INOTIFY_USER
1805         {
1806                 .procname       = "inotify",
1807                 .mode           = 0555,
1808                 .child          = inotify_table,
1809         },
1810 #endif
1811 #ifdef CONFIG_EPOLL
1812         {
1813                 .procname       = "epoll",
1814                 .mode           = 0555,
1815                 .child          = epoll_table,
1816         },
1817 #endif
1818 #endif
1819         {
1820                 .procname       = "protected_symlinks",
1821                 .data           = &sysctl_protected_symlinks,
1822                 .maxlen         = sizeof(int),
1823                 .mode           = 0600,
1824                 .proc_handler   = proc_dointvec_minmax,
1825                 .extra1         = &zero,
1826                 .extra2         = &one,
1827         },
1828         {
1829                 .procname       = "protected_hardlinks",
1830                 .data           = &sysctl_protected_hardlinks,
1831                 .maxlen         = sizeof(int),
1832                 .mode           = 0600,
1833                 .proc_handler   = proc_dointvec_minmax,
1834                 .extra1         = &zero,
1835                 .extra2         = &one,
1836         },
1837         {
1838                 .procname       = "protected_fifos",
1839                 .data           = &sysctl_protected_fifos,
1840                 .maxlen         = sizeof(int),
1841                 .mode           = 0600,
1842                 .proc_handler   = proc_dointvec_minmax,
1843                 .extra1         = &zero,
1844                 .extra2         = &two,
1845         },
1846         {
1847                 .procname       = "protected_regular",
1848                 .data           = &sysctl_protected_regular,
1849                 .maxlen         = sizeof(int),
1850                 .mode           = 0600,
1851                 .proc_handler   = proc_dointvec_minmax,
1852                 .extra1         = &zero,
1853                 .extra2         = &two,
1854         },
1855         {
1856                 .procname       = "suid_dumpable",
1857                 .data           = &suid_dumpable,
1858                 .maxlen         = sizeof(int),
1859                 .mode           = 0644,
1860                 .proc_handler   = proc_dointvec_minmax_coredump,
1861                 .extra1         = &zero,
1862                 .extra2         = &two,
1863         },
1864 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1865         {
1866                 .procname       = "binfmt_misc",
1867                 .mode           = 0555,
1868                 .child          = sysctl_mount_point,
1869         },
1870 #endif
1871         {
1872                 .procname       = "pipe-max-size",
1873                 .data           = &pipe_max_size,
1874                 .maxlen         = sizeof(pipe_max_size),
1875                 .mode           = 0644,
1876                 .proc_handler   = proc_dopipe_max_size,
1877         },
1878         {
1879                 .procname       = "pipe-user-pages-hard",
1880                 .data           = &pipe_user_pages_hard,
1881                 .maxlen         = sizeof(pipe_user_pages_hard),
1882                 .mode           = 0644,
1883                 .proc_handler   = proc_doulongvec_minmax,
1884         },
1885         {
1886                 .procname       = "pipe-user-pages-soft",
1887                 .data           = &pipe_user_pages_soft,
1888                 .maxlen         = sizeof(pipe_user_pages_soft),
1889                 .mode           = 0644,
1890                 .proc_handler   = proc_doulongvec_minmax,
1891         },
1892         {
1893                 .procname       = "mount-max",
1894                 .data           = &sysctl_mount_max,
1895                 .maxlen         = sizeof(unsigned int),
1896                 .mode           = 0644,
1897                 .proc_handler   = proc_dointvec_minmax,
1898                 .extra1         = &one,
1899         },
1900         { }
1901 };
1902
1903 static struct ctl_table debug_table[] = {
1904 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1905         {
1906                 .procname       = "exception-trace",
1907                 .data           = &show_unhandled_signals,
1908                 .maxlen         = sizeof(int),
1909                 .mode           = 0644,
1910                 .proc_handler   = proc_dointvec
1911         },
1912 #endif
1913 #if defined(CONFIG_OPTPROBES)
1914         {
1915                 .procname       = "kprobes-optimization",
1916                 .data           = &sysctl_kprobes_optimization,
1917                 .maxlen         = sizeof(int),
1918                 .mode           = 0644,
1919                 .proc_handler   = proc_kprobes_optimization_handler,
1920                 .extra1         = &zero,
1921                 .extra2         = &one,
1922         },
1923 #endif
1924         { }
1925 };
1926
1927 static struct ctl_table dev_table[] = {
1928         { }
1929 };
1930
1931 int __init sysctl_init(void)
1932 {
1933         struct ctl_table_header *hdr;
1934
1935         hdr = register_sysctl_table(sysctl_base_table);
1936         kmemleak_not_leak(hdr);
1937         return 0;
1938 }
1939
1940 #endif /* CONFIG_SYSCTL */
1941
1942 /*
1943  * /proc/sys support
1944  */
1945
1946 #ifdef CONFIG_PROC_SYSCTL
1947
1948 static int _proc_do_string(char *data, int maxlen, int write,
1949                            char __user *buffer,
1950                            size_t *lenp, loff_t *ppos)
1951 {
1952         size_t len;
1953         char __user *p;
1954         char c;
1955
1956         if (!data || !maxlen || !*lenp) {
1957                 *lenp = 0;
1958                 return 0;
1959         }
1960
1961         if (write) {
1962                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1963                         /* Only continue writes not past the end of buffer. */
1964                         len = strlen(data);
1965                         if (len > maxlen - 1)
1966                                 len = maxlen - 1;
1967
1968                         if (*ppos > len)
1969                                 return 0;
1970                         len = *ppos;
1971                 } else {
1972                         /* Start writing from beginning of buffer. */
1973                         len = 0;
1974                 }
1975
1976                 *ppos += *lenp;
1977                 p = buffer;
1978                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1979                         if (get_user(c, p++))
1980                                 return -EFAULT;
1981                         if (c == 0 || c == '\n')
1982                                 break;
1983                         data[len++] = c;
1984                 }
1985                 data[len] = 0;
1986         } else {
1987                 len = strlen(data);
1988                 if (len > maxlen)
1989                         len = maxlen;
1990
1991                 if (*ppos > len) {
1992                         *lenp = 0;
1993                         return 0;
1994                 }
1995
1996                 data += *ppos;
1997                 len  -= *ppos;
1998
1999                 if (len > *lenp)
2000                         len = *lenp;
2001                 if (len)
2002                         if (copy_to_user(buffer, data, len))
2003                                 return -EFAULT;
2004                 if (len < *lenp) {
2005                         if (put_user('\n', buffer + len))
2006                                 return -EFAULT;
2007                         len++;
2008                 }
2009                 *lenp = len;
2010                 *ppos += len;
2011         }
2012         return 0;
2013 }
2014
2015 static void warn_sysctl_write(struct ctl_table *table)
2016 {
2017         pr_warn_once("%s wrote to %s when file position was not 0!\n"
2018                 "This will not be supported in the future. To silence this\n"
2019                 "warning, set kernel.sysctl_writes_strict = -1\n",
2020                 current->comm, table->procname);
2021 }
2022
2023 /**
2024  * proc_first_pos_non_zero_ignore - check if first position is allowed
2025  * @ppos: file position
2026  * @table: the sysctl table
2027  *
2028  * Returns true if the first position is non-zero and the sysctl_writes_strict
2029  * mode indicates this is not allowed for numeric input types. String proc
2030  * handlers can ignore the return value.
2031  */
2032 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2033                                            struct ctl_table *table)
2034 {
2035         if (!*ppos)
2036                 return false;
2037
2038         switch (sysctl_writes_strict) {
2039         case SYSCTL_WRITES_STRICT:
2040                 return true;
2041         case SYSCTL_WRITES_WARN:
2042                 warn_sysctl_write(table);
2043                 return false;
2044         default:
2045                 return false;
2046         }
2047 }
2048
2049 /**
2050  * proc_dostring - read a string sysctl
2051  * @table: the sysctl table
2052  * @write: %TRUE if this is a write to the sysctl file
2053  * @buffer: the user buffer
2054  * @lenp: the size of the user buffer
2055  * @ppos: file position
2056  *
2057  * Reads/writes a string from/to the user buffer. If the kernel
2058  * buffer provided is not large enough to hold the string, the
2059  * string is truncated. The copied string is %NULL-terminated.
2060  * If the string is being read by the user process, it is copied
2061  * and a newline '\n' is added. It is truncated if the buffer is
2062  * not large enough.
2063  *
2064  * Returns 0 on success.
2065  */
2066 int proc_dostring(struct ctl_table *table, int write,
2067                   void __user *buffer, size_t *lenp, loff_t *ppos)
2068 {
2069         if (write)
2070                 proc_first_pos_non_zero_ignore(ppos, table);
2071
2072         return _proc_do_string((char *)(table->data), table->maxlen, write,
2073                                (char __user *)buffer, lenp, ppos);
2074 }
2075
2076 static size_t proc_skip_spaces(char **buf)
2077 {
2078         size_t ret;
2079         char *tmp = skip_spaces(*buf);
2080         ret = tmp - *buf;
2081         *buf = tmp;
2082         return ret;
2083 }
2084
2085 static void proc_skip_char(char **buf, size_t *size, const char v)
2086 {
2087         while (*size) {
2088                 if (**buf != v)
2089                         break;
2090                 (*size)--;
2091                 (*buf)++;
2092         }
2093 }
2094
2095 #define TMPBUFLEN 22
2096 /**
2097  * proc_get_long - reads an ASCII formatted integer from a user buffer
2098  *
2099  * @buf: a kernel buffer
2100  * @size: size of the kernel buffer
2101  * @val: this is where the number will be stored
2102  * @neg: set to %TRUE if number is negative
2103  * @perm_tr: a vector which contains the allowed trailers
2104  * @perm_tr_len: size of the perm_tr vector
2105  * @tr: pointer to store the trailer character
2106  *
2107  * In case of success %0 is returned and @buf and @size are updated with
2108  * the amount of bytes read. If @tr is non-NULL and a trailing
2109  * character exists (size is non-zero after returning from this
2110  * function), @tr is updated with the trailing character.
2111  */
2112 static int proc_get_long(char **buf, size_t *size,
2113                           unsigned long *val, bool *neg,
2114                           const char *perm_tr, unsigned perm_tr_len, char *tr)
2115 {
2116         int len;
2117         char *p, tmp[TMPBUFLEN];
2118
2119         if (!*size)
2120                 return -EINVAL;
2121
2122         len = *size;
2123         if (len > TMPBUFLEN - 1)
2124                 len = TMPBUFLEN - 1;
2125
2126         memcpy(tmp, *buf, len);
2127
2128         tmp[len] = 0;
2129         p = tmp;
2130         if (*p == '-' && *size > 1) {
2131                 *neg = true;
2132                 p++;
2133         } else
2134                 *neg = false;
2135         if (!isdigit(*p))
2136                 return -EINVAL;
2137
2138         *val = simple_strtoul(p, &p, 0);
2139
2140         len = p - tmp;
2141
2142         /* We don't know if the next char is whitespace thus we may accept
2143          * invalid integers (e.g. 1234...a) or two integers instead of one
2144          * (e.g. 123...1). So lets not allow such large numbers. */
2145         if (len == TMPBUFLEN - 1)
2146                 return -EINVAL;
2147
2148         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2149                 return -EINVAL;
2150
2151         if (tr && (len < *size))
2152                 *tr = *p;
2153
2154         *buf += len;
2155         *size -= len;
2156
2157         return 0;
2158 }
2159
2160 /**
2161  * proc_put_long - converts an integer to a decimal ASCII formatted string
2162  *
2163  * @buf: the user buffer
2164  * @size: the size of the user buffer
2165  * @val: the integer to be converted
2166  * @neg: sign of the number, %TRUE for negative
2167  *
2168  * In case of success %0 is returned and @buf and @size are updated with
2169  * the amount of bytes written.
2170  */
2171 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2172                           bool neg)
2173 {
2174         int len;
2175         char tmp[TMPBUFLEN], *p = tmp;
2176
2177         sprintf(p, "%s%lu", neg ? "-" : "", val);
2178         len = strlen(tmp);
2179         if (len > *size)
2180                 len = *size;
2181         if (copy_to_user(*buf, tmp, len))
2182                 return -EFAULT;
2183         *size -= len;
2184         *buf += len;
2185         return 0;
2186 }
2187 #undef TMPBUFLEN
2188
2189 static int proc_put_char(void __user **buf, size_t *size, char c)
2190 {
2191         if (*size) {
2192                 char __user **buffer = (char __user **)buf;
2193                 if (put_user(c, *buffer))
2194                         return -EFAULT;
2195                 (*size)--, (*buffer)++;
2196                 *buf = *buffer;
2197         }
2198         return 0;
2199 }
2200
2201 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2202                                  int *valp,
2203                                  int write, void *data)
2204 {
2205         if (write) {
2206                 if (*negp) {
2207                         if (*lvalp > (unsigned long) INT_MAX + 1)
2208                                 return -EINVAL;
2209                         *valp = -*lvalp;
2210                 } else {
2211                         if (*lvalp > (unsigned long) INT_MAX)
2212                                 return -EINVAL;
2213                         *valp = *lvalp;
2214                 }
2215         } else {
2216                 int val = *valp;
2217                 if (val < 0) {
2218                         *negp = true;
2219                         *lvalp = -(unsigned long)val;
2220                 } else {
2221                         *negp = false;
2222                         *lvalp = (unsigned long)val;
2223                 }
2224         }
2225         return 0;
2226 }
2227
2228 static int do_proc_douintvec_conv(unsigned long *lvalp,
2229                                   unsigned int *valp,
2230                                   int write, void *data)
2231 {
2232         if (write) {
2233                 if (*lvalp > UINT_MAX)
2234                         return -EINVAL;
2235                 *valp = *lvalp;
2236         } else {
2237                 unsigned int val = *valp;
2238                 *lvalp = (unsigned long)val;
2239         }
2240         return 0;
2241 }
2242
2243 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2244
2245 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2246                   int write, void __user *buffer,
2247                   size_t *lenp, loff_t *ppos,
2248                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2249                               int write, void *data),
2250                   void *data)
2251 {
2252         int *i, vleft, first = 1, err = 0;
2253         size_t left;
2254         char *kbuf = NULL, *p;
2255
2256         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2257                 *lenp = 0;
2258                 return 0;
2259         }
2260
2261         i = (int *) tbl_data;
2262         vleft = table->maxlen / sizeof(*i);
2263         left = *lenp;
2264
2265         if (!conv)
2266                 conv = do_proc_dointvec_conv;
2267
2268         if (write) {
2269                 if (proc_first_pos_non_zero_ignore(ppos, table))
2270                         goto out;
2271
2272                 if (left > PAGE_SIZE - 1)
2273                         left = PAGE_SIZE - 1;
2274                 p = kbuf = memdup_user_nul(buffer, left);
2275                 if (IS_ERR(kbuf))
2276                         return PTR_ERR(kbuf);
2277         }
2278
2279         for (; left && vleft--; i++, first=0) {
2280                 unsigned long lval;
2281                 bool neg;
2282
2283                 if (write) {
2284                         left -= proc_skip_spaces(&p);
2285
2286                         if (!left)
2287                                 break;
2288                         err = proc_get_long(&p, &left, &lval, &neg,
2289                                              proc_wspace_sep,
2290                                              sizeof(proc_wspace_sep), NULL);
2291                         if (err)
2292                                 break;
2293                         if (conv(&neg, &lval, i, 1, data)) {
2294                                 err = -EINVAL;
2295                                 break;
2296                         }
2297                 } else {
2298                         if (conv(&neg, &lval, i, 0, data)) {
2299                                 err = -EINVAL;
2300                                 break;
2301                         }
2302                         if (!first)
2303                                 err = proc_put_char(&buffer, &left, '\t');
2304                         if (err)
2305                                 break;
2306                         err = proc_put_long(&buffer, &left, lval, neg);
2307                         if (err)
2308                                 break;
2309                 }
2310         }
2311
2312         if (!write && !first && left && !err)
2313                 err = proc_put_char(&buffer, &left, '\n');
2314         if (write && !err && left)
2315                 left -= proc_skip_spaces(&p);
2316         if (write) {
2317                 kfree(kbuf);
2318                 if (first)
2319                         return err ? : -EINVAL;
2320         }
2321         *lenp -= left;
2322 out:
2323         *ppos += *lenp;
2324         return err;
2325 }
2326
2327 static int do_proc_dointvec(struct ctl_table *table, int write,
2328                   void __user *buffer, size_t *lenp, loff_t *ppos,
2329                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2330                               int write, void *data),
2331                   void *data)
2332 {
2333         return __do_proc_dointvec(table->data, table, write,
2334                         buffer, lenp, ppos, conv, data);
2335 }
2336
2337 static int do_proc_douintvec_w(unsigned int *tbl_data,
2338                                struct ctl_table *table,
2339                                void __user *buffer,
2340                                size_t *lenp, loff_t *ppos,
2341                                int (*conv)(unsigned long *lvalp,
2342                                            unsigned int *valp,
2343                                            int write, void *data),
2344                                void *data)
2345 {
2346         unsigned long lval;
2347         int err = 0;
2348         size_t left;
2349         bool neg;
2350         char *kbuf = NULL, *p;
2351
2352         left = *lenp;
2353
2354         if (proc_first_pos_non_zero_ignore(ppos, table))
2355                 goto bail_early;
2356
2357         if (left > PAGE_SIZE - 1)
2358                 left = PAGE_SIZE - 1;
2359
2360         p = kbuf = memdup_user_nul(buffer, left);
2361         if (IS_ERR(kbuf))
2362                 return -EINVAL;
2363
2364         left -= proc_skip_spaces(&p);
2365         if (!left) {
2366                 err = -EINVAL;
2367                 goto out_free;
2368         }
2369
2370         err = proc_get_long(&p, &left, &lval, &neg,
2371                              proc_wspace_sep,
2372                              sizeof(proc_wspace_sep), NULL);
2373         if (err || neg) {
2374                 err = -EINVAL;
2375                 goto out_free;
2376         }
2377
2378         if (conv(&lval, tbl_data, 1, data)) {
2379                 err = -EINVAL;
2380                 goto out_free;
2381         }
2382
2383         if (!err && left)
2384                 left -= proc_skip_spaces(&p);
2385
2386 out_free:
2387         kfree(kbuf);
2388         if (err)
2389                 return -EINVAL;
2390
2391         return 0;
2392
2393         /* This is in keeping with old __do_proc_dointvec() */
2394 bail_early:
2395         *ppos += *lenp;
2396         return err;
2397 }
2398
2399 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2400                                size_t *lenp, loff_t *ppos,
2401                                int (*conv)(unsigned long *lvalp,
2402                                            unsigned int *valp,
2403                                            int write, void *data),
2404                                void *data)
2405 {
2406         unsigned long lval;
2407         int err = 0;
2408         size_t left;
2409
2410         left = *lenp;
2411
2412         if (conv(&lval, tbl_data, 0, data)) {
2413                 err = -EINVAL;
2414                 goto out;
2415         }
2416
2417         err = proc_put_long(&buffer, &left, lval, false);
2418         if (err || !left)
2419                 goto out;
2420
2421         err = proc_put_char(&buffer, &left, '\n');
2422
2423 out:
2424         *lenp -= left;
2425         *ppos += *lenp;
2426
2427         return err;
2428 }
2429
2430 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2431                                int write, void __user *buffer,
2432                                size_t *lenp, loff_t *ppos,
2433                                int (*conv)(unsigned long *lvalp,
2434                                            unsigned int *valp,
2435                                            int write, void *data),
2436                                void *data)
2437 {
2438         unsigned int *i, vleft;
2439
2440         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2441                 *lenp = 0;
2442                 return 0;
2443         }
2444
2445         i = (unsigned int *) tbl_data;
2446         vleft = table->maxlen / sizeof(*i);
2447
2448         /*
2449          * Arrays are not supported, keep this simple. *Do not* add
2450          * support for them.
2451          */
2452         if (vleft != 1) {
2453                 *lenp = 0;
2454                 return -EINVAL;
2455         }
2456
2457         if (!conv)
2458                 conv = do_proc_douintvec_conv;
2459
2460         if (write)
2461                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2462                                            conv, data);
2463         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2464 }
2465
2466 static int do_proc_douintvec(struct ctl_table *table, int write,
2467                              void __user *buffer, size_t *lenp, loff_t *ppos,
2468                              int (*conv)(unsigned long *lvalp,
2469                                          unsigned int *valp,
2470                                          int write, void *data),
2471                              void *data)
2472 {
2473         return __do_proc_douintvec(table->data, table, write,
2474                                    buffer, lenp, ppos, conv, data);
2475 }
2476
2477 /**
2478  * proc_dointvec - read a vector of integers
2479  * @table: the sysctl table
2480  * @write: %TRUE if this is a write to the sysctl file
2481  * @buffer: the user buffer
2482  * @lenp: the size of the user buffer
2483  * @ppos: file position
2484  *
2485  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2486  * values from/to the user buffer, treated as an ASCII string.
2487  *
2488  * Returns 0 on success.
2489  */
2490 int proc_dointvec(struct ctl_table *table, int write,
2491                      void __user *buffer, size_t *lenp, loff_t *ppos)
2492 {
2493         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2494 }
2495
2496 /**
2497  * proc_douintvec - read a vector of unsigned integers
2498  * @table: the sysctl table
2499  * @write: %TRUE if this is a write to the sysctl file
2500  * @buffer: the user buffer
2501  * @lenp: the size of the user buffer
2502  * @ppos: file position
2503  *
2504  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2505  * values from/to the user buffer, treated as an ASCII string.
2506  *
2507  * Returns 0 on success.
2508  */
2509 int proc_douintvec(struct ctl_table *table, int write,
2510                      void __user *buffer, size_t *lenp, loff_t *ppos)
2511 {
2512         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2513                                  do_proc_douintvec_conv, NULL);
2514 }
2515
2516 /*
2517  * Taint values can only be increased
2518  * This means we can safely use a temporary.
2519  */
2520 static int proc_taint(struct ctl_table *table, int write,
2521                                void __user *buffer, size_t *lenp, loff_t *ppos)
2522 {
2523         struct ctl_table t;
2524         unsigned long tmptaint = get_taint();
2525         int err;
2526
2527         if (write && !capable(CAP_SYS_ADMIN))
2528                 return -EPERM;
2529
2530         t = *table;
2531         t.data = &tmptaint;
2532         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2533         if (err < 0)
2534                 return err;
2535
2536         if (write) {
2537                 /*
2538                  * Poor man's atomic or. Not worth adding a primitive
2539                  * to everyone's atomic.h for this
2540                  */
2541                 int i;
2542                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2543                         if ((tmptaint >> i) & 1)
2544                                 add_taint(i, LOCKDEP_STILL_OK);
2545                 }
2546         }
2547
2548         return err;
2549 }
2550
2551 #ifdef CONFIG_PRINTK
2552 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2553                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2554 {
2555         if (write && !capable(CAP_SYS_ADMIN))
2556                 return -EPERM;
2557
2558         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2559 }
2560 #endif
2561
2562 /**
2563  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2564  * @min: pointer to minimum allowable value
2565  * @max: pointer to maximum allowable value
2566  *
2567  * The do_proc_dointvec_minmax_conv_param structure provides the
2568  * minimum and maximum values for doing range checking for those sysctl
2569  * parameters that use the proc_dointvec_minmax() handler.
2570  */
2571 struct do_proc_dointvec_minmax_conv_param {
2572         int *min;
2573         int *max;
2574 };
2575
2576 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2577                                         int *valp,
2578                                         int write, void *data)
2579 {
2580         struct do_proc_dointvec_minmax_conv_param *param = data;
2581         if (write) {
2582                 int val = *negp ? -*lvalp : *lvalp;
2583                 if ((param->min && *param->min > val) ||
2584                     (param->max && *param->max < val))
2585                         return -EINVAL;
2586                 *valp = val;
2587         } else {
2588                 int val = *valp;
2589                 if (val < 0) {
2590                         *negp = true;
2591                         *lvalp = -(unsigned long)val;
2592                 } else {
2593                         *negp = false;
2594                         *lvalp = (unsigned long)val;
2595                 }
2596         }
2597         return 0;
2598 }
2599
2600 /**
2601  * proc_dointvec_minmax - read a vector of integers with min/max values
2602  * @table: the sysctl table
2603  * @write: %TRUE if this is a write to the sysctl file
2604  * @buffer: the user buffer
2605  * @lenp: the size of the user buffer
2606  * @ppos: file position
2607  *
2608  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2609  * values from/to the user buffer, treated as an ASCII string.
2610  *
2611  * This routine will ensure the values are within the range specified by
2612  * table->extra1 (min) and table->extra2 (max).
2613  *
2614  * Returns 0 on success or -EINVAL on write when the range check fails.
2615  */
2616 int proc_dointvec_minmax(struct ctl_table *table, int write,
2617                   void __user *buffer, size_t *lenp, loff_t *ppos)
2618 {
2619         struct do_proc_dointvec_minmax_conv_param param = {
2620                 .min = (int *) table->extra1,
2621                 .max = (int *) table->extra2,
2622         };
2623         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2624                                 do_proc_dointvec_minmax_conv, &param);
2625 }
2626
2627 /**
2628  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2629  * @min: pointer to minimum allowable value
2630  * @max: pointer to maximum allowable value
2631  *
2632  * The do_proc_douintvec_minmax_conv_param structure provides the
2633  * minimum and maximum values for doing range checking for those sysctl
2634  * parameters that use the proc_douintvec_minmax() handler.
2635  */
2636 struct do_proc_douintvec_minmax_conv_param {
2637         unsigned int *min;
2638         unsigned int *max;
2639 };
2640
2641 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2642                                          unsigned int *valp,
2643                                          int write, void *data)
2644 {
2645         struct do_proc_douintvec_minmax_conv_param *param = data;
2646
2647         if (write) {
2648                 unsigned int val = *lvalp;
2649
2650                 if (*lvalp > UINT_MAX)
2651                         return -EINVAL;
2652
2653                 if ((param->min && *param->min > val) ||
2654                     (param->max && *param->max < val))
2655                         return -ERANGE;
2656
2657                 *valp = val;
2658         } else {
2659                 unsigned int val = *valp;
2660                 *lvalp = (unsigned long) val;
2661         }
2662
2663         return 0;
2664 }
2665
2666 /**
2667  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2668  * @table: the sysctl table
2669  * @write: %TRUE if this is a write to the sysctl file
2670  * @buffer: the user buffer
2671  * @lenp: the size of the user buffer
2672  * @ppos: file position
2673  *
2674  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2675  * values from/to the user buffer, treated as an ASCII string. Negative
2676  * strings are not allowed.
2677  *
2678  * This routine will ensure the values are within the range specified by
2679  * table->extra1 (min) and table->extra2 (max). There is a final sanity
2680  * check for UINT_MAX to avoid having to support wrap around uses from
2681  * userspace.
2682  *
2683  * Returns 0 on success or -ERANGE on write when the range check fails.
2684  */
2685 int proc_douintvec_minmax(struct ctl_table *table, int write,
2686                           void __user *buffer, size_t *lenp, loff_t *ppos)
2687 {
2688         struct do_proc_douintvec_minmax_conv_param param = {
2689                 .min = (unsigned int *) table->extra1,
2690                 .max = (unsigned int *) table->extra2,
2691         };
2692         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2693                                  do_proc_douintvec_minmax_conv, &param);
2694 }
2695
2696 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2697                                         unsigned int *valp,
2698                                         int write, void *data)
2699 {
2700         if (write) {
2701                 unsigned int val;
2702
2703                 val = round_pipe_size(*lvalp);
2704                 if (val == 0)
2705                         return -EINVAL;
2706
2707                 *valp = val;
2708         } else {
2709                 unsigned int val = *valp;
2710                 *lvalp = (unsigned long) val;
2711         }
2712
2713         return 0;
2714 }
2715
2716 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2717                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2718 {
2719         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2720                                  do_proc_dopipe_max_size_conv, NULL);
2721 }
2722
2723 static void validate_coredump_safety(void)
2724 {
2725 #ifdef CONFIG_COREDUMP
2726         if (suid_dumpable == SUID_DUMP_ROOT &&
2727             core_pattern[0] != '/' && core_pattern[0] != '|') {
2728                 printk(KERN_WARNING
2729 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2730 "Pipe handler or fully qualified core dump path required.\n"
2731 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2732                 );
2733         }
2734 #endif
2735 }
2736
2737 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2738                 void __user *buffer, size_t *lenp, loff_t *ppos)
2739 {
2740         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2741         if (!error)
2742                 validate_coredump_safety();
2743         return error;
2744 }
2745
2746 #ifdef CONFIG_COREDUMP
2747 static int proc_dostring_coredump(struct ctl_table *table, int write,
2748                   void __user *buffer, size_t *lenp, loff_t *ppos)
2749 {
2750         int error = proc_dostring(table, write, buffer, lenp, ppos);
2751         if (!error)
2752                 validate_coredump_safety();
2753         return error;
2754 }
2755 #endif
2756
2757 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2758                                      void __user *buffer,
2759                                      size_t *lenp, loff_t *ppos,
2760                                      unsigned long convmul,
2761                                      unsigned long convdiv)
2762 {
2763         unsigned long *i, *min, *max;
2764         int vleft, first = 1, err = 0;
2765         size_t left;
2766         char *kbuf = NULL, *p;
2767
2768         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2769                 *lenp = 0;
2770                 return 0;
2771         }
2772
2773         i = (unsigned long *) data;
2774         min = (unsigned long *) table->extra1;
2775         max = (unsigned long *) table->extra2;
2776         vleft = table->maxlen / sizeof(unsigned long);
2777         left = *lenp;
2778
2779         if (write) {
2780                 if (proc_first_pos_non_zero_ignore(ppos, table))
2781                         goto out;
2782
2783                 if (left > PAGE_SIZE - 1)
2784                         left = PAGE_SIZE - 1;
2785                 p = kbuf = memdup_user_nul(buffer, left);
2786                 if (IS_ERR(kbuf))
2787                         return PTR_ERR(kbuf);
2788         }
2789
2790         for (; left && vleft--; i++, first = 0) {
2791                 unsigned long val;
2792
2793                 if (write) {
2794                         bool neg;
2795
2796                         left -= proc_skip_spaces(&p);
2797                         if (!left)
2798                                 break;
2799
2800                         err = proc_get_long(&p, &left, &val, &neg,
2801                                              proc_wspace_sep,
2802                                              sizeof(proc_wspace_sep), NULL);
2803                         if (err)
2804                                 break;
2805                         if (neg)
2806                                 continue;
2807                         val = convmul * val / convdiv;
2808                         if ((min && val < *min) || (max && val > *max))
2809                                 continue;
2810                         *i = val;
2811                 } else {
2812                         val = convdiv * (*i) / convmul;
2813                         if (!first) {
2814                                 err = proc_put_char(&buffer, &left, '\t');
2815                                 if (err)
2816                                         break;
2817                         }
2818                         err = proc_put_long(&buffer, &left, val, false);
2819                         if (err)
2820                                 break;
2821                 }
2822         }
2823
2824         if (!write && !first && left && !err)
2825                 err = proc_put_char(&buffer, &left, '\n');
2826         if (write && !err)
2827                 left -= proc_skip_spaces(&p);
2828         if (write) {
2829                 kfree(kbuf);
2830                 if (first)
2831                         return err ? : -EINVAL;
2832         }
2833         *lenp -= left;
2834 out:
2835         *ppos += *lenp;
2836         return err;
2837 }
2838
2839 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2840                                      void __user *buffer,
2841                                      size_t *lenp, loff_t *ppos,
2842                                      unsigned long convmul,
2843                                      unsigned long convdiv)
2844 {
2845         return __do_proc_doulongvec_minmax(table->data, table, write,
2846                         buffer, lenp, ppos, convmul, convdiv);
2847 }
2848
2849 /**
2850  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2851  * @table: the sysctl table
2852  * @write: %TRUE if this is a write to the sysctl file
2853  * @buffer: the user buffer
2854  * @lenp: the size of the user buffer
2855  * @ppos: file position
2856  *
2857  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2858  * values from/to the user buffer, treated as an ASCII string.
2859  *
2860  * This routine will ensure the values are within the range specified by
2861  * table->extra1 (min) and table->extra2 (max).
2862  *
2863  * Returns 0 on success.
2864  */
2865 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2866                            void __user *buffer, size_t *lenp, loff_t *ppos)
2867 {
2868     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2869 }
2870
2871 /**
2872  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2873  * @table: the sysctl table
2874  * @write: %TRUE if this is a write to the sysctl file
2875  * @buffer: the user buffer
2876  * @lenp: the size of the user buffer
2877  * @ppos: file position
2878  *
2879  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2880  * values from/to the user buffer, treated as an ASCII string. The values
2881  * are treated as milliseconds, and converted to jiffies when they are stored.
2882  *
2883  * This routine will ensure the values are within the range specified by
2884  * table->extra1 (min) and table->extra2 (max).
2885  *
2886  * Returns 0 on success.
2887  */
2888 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2889                                       void __user *buffer,
2890                                       size_t *lenp, loff_t *ppos)
2891 {
2892     return do_proc_doulongvec_minmax(table, write, buffer,
2893                                      lenp, ppos, HZ, 1000l);
2894 }
2895
2896
2897 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2898                                          int *valp,
2899                                          int write, void *data)
2900 {
2901         if (write) {
2902                 if (*lvalp > INT_MAX / HZ)
2903                         return 1;
2904                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2905         } else {
2906                 int val = *valp;
2907                 unsigned long lval;
2908                 if (val < 0) {
2909                         *negp = true;
2910                         lval = -(unsigned long)val;
2911                 } else {
2912                         *negp = false;
2913                         lval = (unsigned long)val;
2914                 }
2915                 *lvalp = lval / HZ;
2916         }
2917         return 0;
2918 }
2919
2920 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2921                                                 int *valp,
2922                                                 int write, void *data)
2923 {
2924         if (write) {
2925                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2926                         return 1;
2927                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2928         } else {
2929                 int val = *valp;
2930                 unsigned long lval;
2931                 if (val < 0) {
2932                         *negp = true;
2933                         lval = -(unsigned long)val;
2934                 } else {
2935                         *negp = false;
2936                         lval = (unsigned long)val;
2937                 }
2938                 *lvalp = jiffies_to_clock_t(lval);
2939         }
2940         return 0;
2941 }
2942
2943 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2944                                             int *valp,
2945                                             int write, void *data)
2946 {
2947         if (write) {
2948                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2949
2950                 if (jif > INT_MAX)
2951                         return 1;
2952                 *valp = (int)jif;
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_msecs(lval);
2964         }
2965         return 0;
2966 }
2967
2968 /**
2969  * proc_dointvec_jiffies - read a vector of integers as seconds
2970  * @table: the sysctl table
2971  * @write: %TRUE if this is a write to the sysctl file
2972  * @buffer: the user buffer
2973  * @lenp: the size of the user buffer
2974  * @ppos: file position
2975  *
2976  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2977  * values from/to the user buffer, treated as an ASCII string.
2978  * The values read are assumed to be in seconds, and are converted into
2979  * jiffies.
2980  *
2981  * Returns 0 on success.
2982  */
2983 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2984                           void __user *buffer, size_t *lenp, loff_t *ppos)
2985 {
2986     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2987                             do_proc_dointvec_jiffies_conv,NULL);
2988 }
2989
2990 /**
2991  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2992  * @table: the sysctl table
2993  * @write: %TRUE if this is a write to the sysctl file
2994  * @buffer: the user buffer
2995  * @lenp: the size of the user buffer
2996  * @ppos: pointer to the file position
2997  *
2998  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2999  * values from/to the user buffer, treated as an ASCII string.
3000  * The values read are assumed to be in 1/USER_HZ seconds, and
3001  * are converted into jiffies.
3002  *
3003  * Returns 0 on success.
3004  */
3005 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3006                                  void __user *buffer, size_t *lenp, loff_t *ppos)
3007 {
3008     return do_proc_dointvec(table,write,buffer,lenp,ppos,
3009                             do_proc_dointvec_userhz_jiffies_conv,NULL);
3010 }
3011
3012 /**
3013  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3014  * @table: the sysctl table
3015  * @write: %TRUE if this is a write to the sysctl file
3016  * @buffer: the user buffer
3017  * @lenp: the size of the user buffer
3018  * @ppos: file position
3019  * @ppos: the current position in the file
3020  *
3021  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3022  * values from/to the user buffer, treated as an ASCII string.
3023  * The values read are assumed to be in 1/1000 seconds, and
3024  * are converted into jiffies.
3025  *
3026  * Returns 0 on success.
3027  */
3028 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3029                              void __user *buffer, size_t *lenp, loff_t *ppos)
3030 {
3031         return do_proc_dointvec(table, write, buffer, lenp, ppos,
3032                                 do_proc_dointvec_ms_jiffies_conv, NULL);
3033 }
3034
3035 static int proc_do_cad_pid(struct ctl_table *table, int write,
3036                            void __user *buffer, size_t *lenp, loff_t *ppos)
3037 {
3038         struct pid *new_pid;
3039         pid_t tmp;
3040         int r;
3041
3042         tmp = pid_vnr(cad_pid);
3043
3044         r = __do_proc_dointvec(&tmp, table, write, buffer,
3045                                lenp, ppos, NULL, NULL);
3046         if (r || !write)
3047                 return r;
3048
3049         new_pid = find_get_pid(tmp);
3050         if (!new_pid)
3051                 return -ESRCH;
3052
3053         put_pid(xchg(&cad_pid, new_pid));
3054         return 0;
3055 }
3056
3057 /**
3058  * proc_do_large_bitmap - read/write from/to a large bitmap
3059  * @table: the sysctl table
3060  * @write: %TRUE if this is a write to the sysctl file
3061  * @buffer: the user buffer
3062  * @lenp: the size of the user buffer
3063  * @ppos: file position
3064  *
3065  * The bitmap is stored at table->data and the bitmap length (in bits)
3066  * in table->maxlen.
3067  *
3068  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3069  * large bitmaps may be represented in a compact manner. Writing into
3070  * the file will clear the bitmap then update it with the given input.
3071  *
3072  * Returns 0 on success.
3073  */
3074 int proc_do_large_bitmap(struct ctl_table *table, int write,
3075                          void __user *buffer, size_t *lenp, loff_t *ppos)
3076 {
3077         int err = 0;
3078         bool first = 1;
3079         size_t left = *lenp;
3080         unsigned long bitmap_len = table->maxlen;
3081         unsigned long *bitmap = *(unsigned long **) table->data;
3082         unsigned long *tmp_bitmap = NULL;
3083         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3084
3085         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3086                 *lenp = 0;
3087                 return 0;
3088         }
3089
3090         if (write) {
3091                 char *kbuf, *p;
3092
3093                 if (left > PAGE_SIZE - 1)
3094                         left = PAGE_SIZE - 1;
3095
3096                 p = kbuf = memdup_user_nul(buffer, left);
3097                 if (IS_ERR(kbuf))
3098                         return PTR_ERR(kbuf);
3099
3100                 tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len),
3101                                      sizeof(unsigned long),
3102                                      GFP_KERNEL);
3103                 if (!tmp_bitmap) {
3104                         kfree(kbuf);
3105                         return -ENOMEM;
3106                 }
3107                 proc_skip_char(&p, &left, '\n');
3108                 while (!err && left) {
3109                         unsigned long val_a, val_b;
3110                         bool neg;
3111
3112                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3113                                              sizeof(tr_a), &c);
3114                         if (err)
3115                                 break;
3116                         if (val_a >= bitmap_len || neg) {
3117                                 err = -EINVAL;
3118                                 break;
3119                         }
3120
3121                         val_b = val_a;
3122                         if (left) {
3123                                 p++;
3124                                 left--;
3125                         }
3126
3127                         if (c == '-') {
3128                                 err = proc_get_long(&p, &left, &val_b,
3129                                                      &neg, tr_b, sizeof(tr_b),
3130                                                      &c);
3131                                 if (err)
3132                                         break;
3133                                 if (val_b >= bitmap_len || neg ||
3134                                     val_a > val_b) {
3135                                         err = -EINVAL;
3136                                         break;
3137                                 }
3138                                 if (left) {
3139                                         p++;
3140                                         left--;
3141                                 }
3142                         }
3143
3144                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3145                         first = 0;
3146                         proc_skip_char(&p, &left, '\n');
3147                 }
3148                 kfree(kbuf);
3149         } else {
3150                 unsigned long bit_a, bit_b = 0;
3151
3152                 while (left) {
3153                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3154                         if (bit_a >= bitmap_len)
3155                                 break;
3156                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
3157                                                    bit_a + 1) - 1;
3158
3159                         if (!first) {
3160                                 err = proc_put_char(&buffer, &left, ',');
3161                                 if (err)
3162                                         break;
3163                         }
3164                         err = proc_put_long(&buffer, &left, bit_a, false);
3165                         if (err)
3166                                 break;
3167                         if (bit_a != bit_b) {
3168                                 err = proc_put_char(&buffer, &left, '-');
3169                                 if (err)
3170                                         break;
3171                                 err = proc_put_long(&buffer, &left, bit_b, false);
3172                                 if (err)
3173                                         break;
3174                         }
3175
3176                         first = 0; bit_b++;
3177                 }
3178                 if (!err)
3179                         err = proc_put_char(&buffer, &left, '\n');
3180         }
3181
3182         if (!err) {
3183                 if (write) {
3184                         if (*ppos)
3185                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3186                         else
3187                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3188                 }
3189                 *lenp -= left;
3190                 *ppos += *lenp;
3191         }
3192
3193         kfree(tmp_bitmap);
3194         return err;
3195 }
3196
3197 #else /* CONFIG_PROC_SYSCTL */
3198
3199 int proc_dostring(struct ctl_table *table, int write,
3200                   void __user *buffer, size_t *lenp, loff_t *ppos)
3201 {
3202         return -ENOSYS;
3203 }
3204
3205 int proc_dointvec(struct ctl_table *table, int write,
3206                   void __user *buffer, size_t *lenp, loff_t *ppos)
3207 {
3208         return -ENOSYS;
3209 }
3210
3211 int proc_douintvec(struct ctl_table *table, int write,
3212                   void __user *buffer, size_t *lenp, loff_t *ppos)
3213 {
3214         return -ENOSYS;
3215 }
3216
3217 int proc_dointvec_minmax(struct ctl_table *table, int write,
3218                     void __user *buffer, size_t *lenp, loff_t *ppos)
3219 {
3220         return -ENOSYS;
3221 }
3222
3223 int proc_douintvec_minmax(struct ctl_table *table, int write,
3224                           void __user *buffer, size_t *lenp, loff_t *ppos)
3225 {
3226         return -ENOSYS;
3227 }
3228
3229 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3230                     void __user *buffer, size_t *lenp, loff_t *ppos)
3231 {
3232         return -ENOSYS;
3233 }
3234
3235 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3236                     void __user *buffer, size_t *lenp, loff_t *ppos)
3237 {
3238         return -ENOSYS;
3239 }
3240
3241 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3242                              void __user *buffer, size_t *lenp, loff_t *ppos)
3243 {
3244         return -ENOSYS;
3245 }
3246
3247 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3248                     void __user *buffer, size_t *lenp, loff_t *ppos)
3249 {
3250         return -ENOSYS;
3251 }
3252
3253 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3254                                       void __user *buffer,
3255                                       size_t *lenp, loff_t *ppos)
3256 {
3257     return -ENOSYS;
3258 }
3259
3260
3261 #endif /* CONFIG_PROC_SYSCTL */
3262
3263 /*
3264  * No sense putting this after each symbol definition, twice,
3265  * exception granted :-)
3266  */
3267 EXPORT_SYMBOL(proc_dointvec);
3268 EXPORT_SYMBOL(proc_douintvec);
3269 EXPORT_SYMBOL(proc_dointvec_jiffies);
3270 EXPORT_SYMBOL(proc_dointvec_minmax);
3271 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3272 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3273 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3274 EXPORT_SYMBOL(proc_dostring);
3275 EXPORT_SYMBOL(proc_doulongvec_minmax);
3276 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);