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