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