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(unsigned long *lvalp,
2179                                   unsigned int *valp,
2180                                   int write, void *data)
2181 {
2182         if (write) {
2183                 if (*lvalp > UINT_MAX)
2184                         return -EINVAL;
2185                 if (*lvalp > UINT_MAX)
2186                         return -EINVAL;
2187                 *valp = *lvalp;
2188         } else {
2189                 unsigned int val = *valp;
2190                 *lvalp = (unsigned long)val;
2191         }
2192         return 0;
2193 }
2194
2195 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2196
2197 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2198                   int write, void __user *buffer,
2199                   size_t *lenp, loff_t *ppos,
2200                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2201                               int write, void *data),
2202                   void *data)
2203 {
2204         int *i, vleft, first = 1, err = 0;
2205         size_t left;
2206         char *kbuf = NULL, *p;
2207
2208         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2209                 *lenp = 0;
2210                 return 0;
2211         }
2212
2213         i = (int *) tbl_data;
2214         vleft = table->maxlen / sizeof(*i);
2215         left = *lenp;
2216
2217         if (!conv)
2218                 conv = do_proc_dointvec_conv;
2219
2220         if (write) {
2221                 if (proc_first_pos_non_zero_ignore(ppos, table))
2222                         goto out;
2223
2224                 if (left > PAGE_SIZE - 1)
2225                         left = PAGE_SIZE - 1;
2226                 p = kbuf = memdup_user_nul(buffer, left);
2227                 if (IS_ERR(kbuf))
2228                         return PTR_ERR(kbuf);
2229         }
2230
2231         for (; left && vleft--; i++, first=0) {
2232                 unsigned long lval;
2233                 bool neg;
2234
2235                 if (write) {
2236                         left -= proc_skip_spaces(&p);
2237
2238                         if (!left)
2239                                 break;
2240                         err = proc_get_long(&p, &left, &lval, &neg,
2241                                              proc_wspace_sep,
2242                                              sizeof(proc_wspace_sep), NULL);
2243                         if (err)
2244                                 break;
2245                         if (conv(&neg, &lval, i, 1, data)) {
2246                                 err = -EINVAL;
2247                                 break;
2248                         }
2249                 } else {
2250                         if (conv(&neg, &lval, i, 0, data)) {
2251                                 err = -EINVAL;
2252                                 break;
2253                         }
2254                         if (!first)
2255                                 err = proc_put_char(&buffer, &left, '\t');
2256                         if (err)
2257                                 break;
2258                         err = proc_put_long(&buffer, &left, lval, neg);
2259                         if (err)
2260                                 break;
2261                 }
2262         }
2263
2264         if (!write && !first && left && !err)
2265                 err = proc_put_char(&buffer, &left, '\n');
2266         if (write && !err && left)
2267                 left -= proc_skip_spaces(&p);
2268         if (write) {
2269                 kfree(kbuf);
2270                 if (first)
2271                         return err ? : -EINVAL;
2272         }
2273         *lenp -= left;
2274 out:
2275         *ppos += *lenp;
2276         return err;
2277 }
2278
2279 static int do_proc_dointvec(struct ctl_table *table, int write,
2280                   void __user *buffer, size_t *lenp, loff_t *ppos,
2281                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2282                               int write, void *data),
2283                   void *data)
2284 {
2285         return __do_proc_dointvec(table->data, table, write,
2286                         buffer, lenp, ppos, conv, data);
2287 }
2288
2289 static int do_proc_douintvec_w(unsigned int *tbl_data,
2290                                struct ctl_table *table,
2291                                void __user *buffer,
2292                                size_t *lenp, loff_t *ppos,
2293                                int (*conv)(unsigned long *lvalp,
2294                                            unsigned int *valp,
2295                                            int write, void *data),
2296                                void *data)
2297 {
2298         unsigned long lval;
2299         int err = 0;
2300         size_t left;
2301         bool neg;
2302         char *kbuf = NULL, *p;
2303
2304         left = *lenp;
2305
2306         if (proc_first_pos_non_zero_ignore(ppos, table))
2307                 goto bail_early;
2308
2309         if (left > PAGE_SIZE - 1)
2310                 left = PAGE_SIZE - 1;
2311
2312         p = kbuf = memdup_user_nul(buffer, left);
2313         if (IS_ERR(kbuf))
2314                 return -EINVAL;
2315
2316         left -= proc_skip_spaces(&p);
2317         if (!left) {
2318                 err = -EINVAL;
2319                 goto out_free;
2320         }
2321
2322         err = proc_get_long(&p, &left, &lval, &neg,
2323                              proc_wspace_sep,
2324                              sizeof(proc_wspace_sep), NULL);
2325         if (err || neg) {
2326                 err = -EINVAL;
2327                 goto out_free;
2328         }
2329
2330         if (conv(&lval, tbl_data, 1, data)) {
2331                 err = -EINVAL;
2332                 goto out_free;
2333         }
2334
2335         if (!err && left)
2336                 left -= proc_skip_spaces(&p);
2337
2338 out_free:
2339         kfree(kbuf);
2340         if (err)
2341                 return -EINVAL;
2342
2343         return 0;
2344
2345         /* This is in keeping with old __do_proc_dointvec() */
2346 bail_early:
2347         *ppos += *lenp;
2348         return err;
2349 }
2350
2351 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2352                                size_t *lenp, loff_t *ppos,
2353                                int (*conv)(unsigned long *lvalp,
2354                                            unsigned int *valp,
2355                                            int write, void *data),
2356                                void *data)
2357 {
2358         unsigned long lval;
2359         int err = 0;
2360         size_t left;
2361
2362         left = *lenp;
2363
2364         if (conv(&lval, tbl_data, 0, data)) {
2365                 err = -EINVAL;
2366                 goto out;
2367         }
2368
2369         err = proc_put_long(&buffer, &left, lval, false);
2370         if (err || !left)
2371                 goto out;
2372
2373         err = proc_put_char(&buffer, &left, '\n');
2374
2375 out:
2376         *lenp -= left;
2377         *ppos += *lenp;
2378
2379         return err;
2380 }
2381
2382 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2383                                int write, void __user *buffer,
2384                                size_t *lenp, loff_t *ppos,
2385                                int (*conv)(unsigned long *lvalp,
2386                                            unsigned int *valp,
2387                                            int write, void *data),
2388                                void *data)
2389 {
2390         unsigned int *i, vleft;
2391
2392         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2393                 *lenp = 0;
2394                 return 0;
2395         }
2396
2397         i = (unsigned int *) tbl_data;
2398         vleft = table->maxlen / sizeof(*i);
2399
2400         /*
2401          * Arrays are not supported, keep this simple. *Do not* add
2402          * support for them.
2403          */
2404         if (vleft != 1) {
2405                 *lenp = 0;
2406                 return -EINVAL;
2407         }
2408
2409         if (!conv)
2410                 conv = do_proc_douintvec_conv;
2411
2412         if (write)
2413                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2414                                            conv, data);
2415         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2416 }
2417
2418 static int do_proc_douintvec(struct ctl_table *table, int write,
2419                              void __user *buffer, size_t *lenp, loff_t *ppos,
2420                              int (*conv)(unsigned long *lvalp,
2421                                          unsigned int *valp,
2422                                          int write, void *data),
2423                              void *data)
2424 {
2425         return __do_proc_douintvec(table->data, table, write,
2426                                    buffer, lenp, ppos, conv, data);
2427 }
2428
2429 /**
2430  * proc_dointvec - read a vector of integers
2431  * @table: the sysctl table
2432  * @write: %TRUE if this is a write to the sysctl file
2433  * @buffer: the user buffer
2434  * @lenp: the size of the user buffer
2435  * @ppos: file position
2436  *
2437  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2438  * values from/to the user buffer, treated as an ASCII string.
2439  *
2440  * Returns 0 on success.
2441  */
2442 int proc_dointvec(struct ctl_table *table, int write,
2443                      void __user *buffer, size_t *lenp, loff_t *ppos)
2444 {
2445         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2446 }
2447
2448 /**
2449  * proc_douintvec - read a vector of unsigned integers
2450  * @table: the sysctl table
2451  * @write: %TRUE if this is a write to the sysctl file
2452  * @buffer: the user buffer
2453  * @lenp: the size of the user buffer
2454  * @ppos: file position
2455  *
2456  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2457  * values from/to the user buffer, treated as an ASCII string.
2458  *
2459  * Returns 0 on success.
2460  */
2461 int proc_douintvec(struct ctl_table *table, int write,
2462                      void __user *buffer, size_t *lenp, loff_t *ppos)
2463 {
2464         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2465                                  do_proc_douintvec_conv, NULL);
2466 }
2467
2468 /*
2469  * Taint values can only be increased
2470  * This means we can safely use a temporary.
2471  */
2472 static int proc_taint(struct ctl_table *table, int write,
2473                                void __user *buffer, size_t *lenp, loff_t *ppos)
2474 {
2475         struct ctl_table t;
2476         unsigned long tmptaint = get_taint();
2477         int err;
2478
2479         if (write && !capable(CAP_SYS_ADMIN))
2480                 return -EPERM;
2481
2482         t = *table;
2483         t.data = &tmptaint;
2484         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2485         if (err < 0)
2486                 return err;
2487
2488         if (write) {
2489                 /*
2490                  * Poor man's atomic or. Not worth adding a primitive
2491                  * to everyone's atomic.h for this
2492                  */
2493                 int i;
2494                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2495                         if ((tmptaint >> i) & 1)
2496                                 add_taint(i, LOCKDEP_STILL_OK);
2497                 }
2498         }
2499
2500         return err;
2501 }
2502
2503 #ifdef CONFIG_PRINTK
2504 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2505                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2506 {
2507         if (write && !capable(CAP_SYS_ADMIN))
2508                 return -EPERM;
2509
2510         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2511 }
2512 #endif
2513
2514 struct do_proc_dointvec_minmax_conv_param {
2515         int *min;
2516         int *max;
2517 };
2518
2519 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2520                                         int *valp,
2521                                         int write, void *data)
2522 {
2523         struct do_proc_dointvec_minmax_conv_param *param = data;
2524         if (write) {
2525                 int val = *negp ? -*lvalp : *lvalp;
2526                 if ((param->min && *param->min > val) ||
2527                     (param->max && *param->max < val))
2528                         return -EINVAL;
2529                 *valp = val;
2530         } else {
2531                 int val = *valp;
2532                 if (val < 0) {
2533                         *negp = true;
2534                         *lvalp = -(unsigned long)val;
2535                 } else {
2536                         *negp = false;
2537                         *lvalp = (unsigned long)val;
2538                 }
2539         }
2540         return 0;
2541 }
2542
2543 /**
2544  * proc_dointvec_minmax - read a vector of integers with min/max values
2545  * @table: the sysctl table
2546  * @write: %TRUE if this is a write to the sysctl file
2547  * @buffer: the user buffer
2548  * @lenp: the size of the user buffer
2549  * @ppos: file position
2550  *
2551  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2552  * values from/to the user buffer, treated as an ASCII string.
2553  *
2554  * This routine will ensure the values are within the range specified by
2555  * table->extra1 (min) and table->extra2 (max).
2556  *
2557  * Returns 0 on success.
2558  */
2559 int proc_dointvec_minmax(struct ctl_table *table, int write,
2560                   void __user *buffer, size_t *lenp, loff_t *ppos)
2561 {
2562         struct do_proc_dointvec_minmax_conv_param param = {
2563                 .min = (int *) table->extra1,
2564                 .max = (int *) table->extra2,
2565         };
2566         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2567                                 do_proc_dointvec_minmax_conv, &param);
2568 }
2569
2570 struct do_proc_douintvec_minmax_conv_param {
2571         unsigned int *min;
2572         unsigned int *max;
2573 };
2574
2575 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2576                                          unsigned int *valp,
2577                                          int write, void *data)
2578 {
2579         struct do_proc_douintvec_minmax_conv_param *param = data;
2580
2581         if (write) {
2582                 unsigned int val = *lvalp;
2583
2584                 if ((param->min && *param->min > val) ||
2585                     (param->max && *param->max < val))
2586                         return -ERANGE;
2587
2588                 if (*lvalp > UINT_MAX)
2589                         return -EINVAL;
2590                 *valp = val;
2591         } else {
2592                 unsigned int val = *valp;
2593                 *lvalp = (unsigned long) val;
2594         }
2595
2596         return 0;
2597 }
2598
2599 /**
2600  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2601  * @table: the sysctl table
2602  * @write: %TRUE if this is a write to the sysctl file
2603  * @buffer: the user buffer
2604  * @lenp: the size of the user buffer
2605  * @ppos: file position
2606  *
2607  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2608  * values from/to the user buffer, treated as an ASCII string. Negative
2609  * strings are not allowed.
2610  *
2611  * This routine will ensure the values are within the range specified by
2612  * table->extra1 (min) and table->extra2 (max). There is a final sanity
2613  * check for UINT_MAX to avoid having to support wrap around uses from
2614  * userspace.
2615  *
2616  * Returns 0 on success.
2617  */
2618 int proc_douintvec_minmax(struct ctl_table *table, int write,
2619                           void __user *buffer, size_t *lenp, loff_t *ppos)
2620 {
2621         struct do_proc_douintvec_minmax_conv_param param = {
2622                 .min = (unsigned int *) table->extra1,
2623                 .max = (unsigned int *) table->extra2,
2624         };
2625         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2626                                  do_proc_douintvec_minmax_conv, &param);
2627 }
2628
2629 static void validate_coredump_safety(void)
2630 {
2631 #ifdef CONFIG_COREDUMP
2632         if (suid_dumpable == SUID_DUMP_ROOT &&
2633             core_pattern[0] != '/' && core_pattern[0] != '|') {
2634                 printk(KERN_WARNING
2635 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2636 "Pipe handler or fully qualified core dump path required.\n"
2637 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2638                 );
2639         }
2640 #endif
2641 }
2642
2643 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2644                 void __user *buffer, size_t *lenp, loff_t *ppos)
2645 {
2646         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2647         if (!error)
2648                 validate_coredump_safety();
2649         return error;
2650 }
2651
2652 #ifdef CONFIG_COREDUMP
2653 static int proc_dostring_coredump(struct ctl_table *table, int write,
2654                   void __user *buffer, size_t *lenp, loff_t *ppos)
2655 {
2656         int error = proc_dostring(table, write, buffer, lenp, ppos);
2657         if (!error)
2658                 validate_coredump_safety();
2659         return error;
2660 }
2661 #endif
2662
2663 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2664                                      void __user *buffer,
2665                                      size_t *lenp, loff_t *ppos,
2666                                      unsigned long convmul,
2667                                      unsigned long convdiv)
2668 {
2669         unsigned long *i, *min, *max;
2670         int vleft, first = 1, err = 0;
2671         size_t left;
2672         char *kbuf = NULL, *p;
2673
2674         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2675                 *lenp = 0;
2676                 return 0;
2677         }
2678
2679         i = (unsigned long *) data;
2680         min = (unsigned long *) table->extra1;
2681         max = (unsigned long *) table->extra2;
2682         vleft = table->maxlen / sizeof(unsigned long);
2683         left = *lenp;
2684
2685         if (write) {
2686                 if (proc_first_pos_non_zero_ignore(ppos, table))
2687                         goto out;
2688
2689                 if (left > PAGE_SIZE - 1)
2690                         left = PAGE_SIZE - 1;
2691                 p = kbuf = memdup_user_nul(buffer, left);
2692                 if (IS_ERR(kbuf))
2693                         return PTR_ERR(kbuf);
2694         }
2695
2696         for (; left && vleft--; i++, first = 0) {
2697                 unsigned long val;
2698
2699                 if (write) {
2700                         bool neg;
2701
2702                         left -= proc_skip_spaces(&p);
2703
2704                         err = proc_get_long(&p, &left, &val, &neg,
2705                                              proc_wspace_sep,
2706                                              sizeof(proc_wspace_sep), NULL);
2707                         if (err)
2708                                 break;
2709                         if (neg)
2710                                 continue;
2711                         val = convmul * val / convdiv;
2712                         if ((min && val < *min) || (max && val > *max))
2713                                 continue;
2714                         *i = val;
2715                 } else {
2716                         val = convdiv * (*i) / convmul;
2717                         if (!first) {
2718                                 err = proc_put_char(&buffer, &left, '\t');
2719                                 if (err)
2720                                         break;
2721                         }
2722                         err = proc_put_long(&buffer, &left, val, false);
2723                         if (err)
2724                                 break;
2725                 }
2726         }
2727
2728         if (!write && !first && left && !err)
2729                 err = proc_put_char(&buffer, &left, '\n');
2730         if (write && !err)
2731                 left -= proc_skip_spaces(&p);
2732         if (write) {
2733                 kfree(kbuf);
2734                 if (first)
2735                         return err ? : -EINVAL;
2736         }
2737         *lenp -= left;
2738 out:
2739         *ppos += *lenp;
2740         return err;
2741 }
2742
2743 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2744                                      void __user *buffer,
2745                                      size_t *lenp, loff_t *ppos,
2746                                      unsigned long convmul,
2747                                      unsigned long convdiv)
2748 {
2749         return __do_proc_doulongvec_minmax(table->data, table, write,
2750                         buffer, lenp, ppos, convmul, convdiv);
2751 }
2752
2753 /**
2754  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2755  * @table: the sysctl table
2756  * @write: %TRUE if this is a write to the sysctl file
2757  * @buffer: the user buffer
2758  * @lenp: the size of the user buffer
2759  * @ppos: file position
2760  *
2761  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2762  * values from/to the user buffer, treated as an ASCII string.
2763  *
2764  * This routine will ensure the values are within the range specified by
2765  * table->extra1 (min) and table->extra2 (max).
2766  *
2767  * Returns 0 on success.
2768  */
2769 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2770                            void __user *buffer, size_t *lenp, loff_t *ppos)
2771 {
2772     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2773 }
2774
2775 /**
2776  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2777  * @table: the sysctl table
2778  * @write: %TRUE if this is a write to the sysctl file
2779  * @buffer: the user buffer
2780  * @lenp: the size of the user buffer
2781  * @ppos: file position
2782  *
2783  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2784  * values from/to the user buffer, treated as an ASCII string. The values
2785  * are treated as milliseconds, and converted to jiffies when they are stored.
2786  *
2787  * This routine will ensure the values are within the range specified by
2788  * table->extra1 (min) and table->extra2 (max).
2789  *
2790  * Returns 0 on success.
2791  */
2792 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2793                                       void __user *buffer,
2794                                       size_t *lenp, loff_t *ppos)
2795 {
2796     return do_proc_doulongvec_minmax(table, write, buffer,
2797                                      lenp, ppos, HZ, 1000l);
2798 }
2799
2800
2801 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2802                                          int *valp,
2803                                          int write, void *data)
2804 {
2805         if (write) {
2806                 if (*lvalp > INT_MAX / HZ)
2807                         return 1;
2808                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2809         } else {
2810                 int val = *valp;
2811                 unsigned long lval;
2812                 if (val < 0) {
2813                         *negp = true;
2814                         lval = -(unsigned long)val;
2815                 } else {
2816                         *negp = false;
2817                         lval = (unsigned long)val;
2818                 }
2819                 *lvalp = lval / HZ;
2820         }
2821         return 0;
2822 }
2823
2824 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2825                                                 int *valp,
2826                                                 int write, void *data)
2827 {
2828         if (write) {
2829                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2830                         return 1;
2831                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2832         } else {
2833                 int val = *valp;
2834                 unsigned long lval;
2835                 if (val < 0) {
2836                         *negp = true;
2837                         lval = -(unsigned long)val;
2838                 } else {
2839                         *negp = false;
2840                         lval = (unsigned long)val;
2841                 }
2842                 *lvalp = jiffies_to_clock_t(lval);
2843         }
2844         return 0;
2845 }
2846
2847 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2848                                             int *valp,
2849                                             int write, void *data)
2850 {
2851         if (write) {
2852                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2853
2854                 if (jif > INT_MAX)
2855                         return 1;
2856                 *valp = (int)jif;
2857         } else {
2858                 int val = *valp;
2859                 unsigned long lval;
2860                 if (val < 0) {
2861                         *negp = true;
2862                         lval = -(unsigned long)val;
2863                 } else {
2864                         *negp = false;
2865                         lval = (unsigned long)val;
2866                 }
2867                 *lvalp = jiffies_to_msecs(lval);
2868         }
2869         return 0;
2870 }
2871
2872 /**
2873  * proc_dointvec_jiffies - read a vector of integers as seconds
2874  * @table: the sysctl table
2875  * @write: %TRUE if this is a write to the sysctl file
2876  * @buffer: the user buffer
2877  * @lenp: the size of the user buffer
2878  * @ppos: file position
2879  *
2880  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2881  * values from/to the user buffer, treated as an ASCII string.
2882  * The values read are assumed to be in seconds, and are converted into
2883  * jiffies.
2884  *
2885  * Returns 0 on success.
2886  */
2887 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2888                           void __user *buffer, size_t *lenp, loff_t *ppos)
2889 {
2890     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2891                             do_proc_dointvec_jiffies_conv,NULL);
2892 }
2893
2894 /**
2895  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2896  * @table: the sysctl table
2897  * @write: %TRUE if this is a write to the sysctl file
2898  * @buffer: the user buffer
2899  * @lenp: the size of the user buffer
2900  * @ppos: pointer to the file position
2901  *
2902  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2903  * values from/to the user buffer, treated as an ASCII string.
2904  * The values read are assumed to be in 1/USER_HZ seconds, and
2905  * are converted into jiffies.
2906  *
2907  * Returns 0 on success.
2908  */
2909 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2910                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2911 {
2912     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2913                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2914 }
2915
2916 /**
2917  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2918  * @table: the sysctl table
2919  * @write: %TRUE if this is a write to the sysctl file
2920  * @buffer: the user buffer
2921  * @lenp: the size of the user buffer
2922  * @ppos: file position
2923  * @ppos: the current position in the file
2924  *
2925  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2926  * values from/to the user buffer, treated as an ASCII string.
2927  * The values read are assumed to be in 1/1000 seconds, and
2928  * are converted into jiffies.
2929  *
2930  * Returns 0 on success.
2931  */
2932 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2933                              void __user *buffer, size_t *lenp, loff_t *ppos)
2934 {
2935         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2936                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2937 }
2938
2939 static int proc_do_cad_pid(struct ctl_table *table, int write,
2940                            void __user *buffer, size_t *lenp, loff_t *ppos)
2941 {
2942         struct pid *new_pid;
2943         pid_t tmp;
2944         int r;
2945
2946         tmp = pid_vnr(cad_pid);
2947
2948         r = __do_proc_dointvec(&tmp, table, write, buffer,
2949                                lenp, ppos, NULL, NULL);
2950         if (r || !write)
2951                 return r;
2952
2953         new_pid = find_get_pid(tmp);
2954         if (!new_pid)
2955                 return -ESRCH;
2956
2957         put_pid(xchg(&cad_pid, new_pid));
2958         return 0;
2959 }
2960
2961 /**
2962  * proc_do_large_bitmap - read/write from/to a large bitmap
2963  * @table: the sysctl table
2964  * @write: %TRUE if this is a write to the sysctl file
2965  * @buffer: the user buffer
2966  * @lenp: the size of the user buffer
2967  * @ppos: file position
2968  *
2969  * The bitmap is stored at table->data and the bitmap length (in bits)
2970  * in table->maxlen.
2971  *
2972  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2973  * large bitmaps may be represented in a compact manner. Writing into
2974  * the file will clear the bitmap then update it with the given input.
2975  *
2976  * Returns 0 on success.
2977  */
2978 int proc_do_large_bitmap(struct ctl_table *table, int write,
2979                          void __user *buffer, size_t *lenp, loff_t *ppos)
2980 {
2981         int err = 0;
2982         bool first = 1;
2983         size_t left = *lenp;
2984         unsigned long bitmap_len = table->maxlen;
2985         unsigned long *bitmap = *(unsigned long **) table->data;
2986         unsigned long *tmp_bitmap = NULL;
2987         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2988
2989         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2990                 *lenp = 0;
2991                 return 0;
2992         }
2993
2994         if (write) {
2995                 char *kbuf, *p;
2996
2997                 if (left > PAGE_SIZE - 1)
2998                         left = PAGE_SIZE - 1;
2999
3000                 p = kbuf = memdup_user_nul(buffer, left);
3001                 if (IS_ERR(kbuf))
3002                         return PTR_ERR(kbuf);
3003
3004                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3005                                      GFP_KERNEL);
3006                 if (!tmp_bitmap) {
3007                         kfree(kbuf);
3008                         return -ENOMEM;
3009                 }
3010                 proc_skip_char(&p, &left, '\n');
3011                 while (!err && left) {
3012                         unsigned long val_a, val_b;
3013                         bool neg;
3014
3015                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3016                                              sizeof(tr_a), &c);
3017                         if (err)
3018                                 break;
3019                         if (val_a >= bitmap_len || neg) {
3020                                 err = -EINVAL;
3021                                 break;
3022                         }
3023
3024                         val_b = val_a;
3025                         if (left) {
3026                                 p++;
3027                                 left--;
3028                         }
3029
3030                         if (c == '-') {
3031                                 err = proc_get_long(&p, &left, &val_b,
3032                                                      &neg, tr_b, sizeof(tr_b),
3033                                                      &c);
3034                                 if (err)
3035                                         break;
3036                                 if (val_b >= bitmap_len || neg ||
3037                                     val_a > val_b) {
3038                                         err = -EINVAL;
3039                                         break;
3040                                 }
3041                                 if (left) {
3042                                         p++;
3043                                         left--;
3044                                 }
3045                         }
3046
3047                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3048                         first = 0;
3049                         proc_skip_char(&p, &left, '\n');
3050                 }
3051                 kfree(kbuf);
3052         } else {
3053                 unsigned long bit_a, bit_b = 0;
3054
3055                 while (left) {
3056                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3057                         if (bit_a >= bitmap_len)
3058                                 break;
3059                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
3060                                                    bit_a + 1) - 1;
3061
3062                         if (!first) {
3063                                 err = proc_put_char(&buffer, &left, ',');
3064                                 if (err)
3065                                         break;
3066                         }
3067                         err = proc_put_long(&buffer, &left, bit_a, false);
3068                         if (err)
3069                                 break;
3070                         if (bit_a != bit_b) {
3071                                 err = proc_put_char(&buffer, &left, '-');
3072                                 if (err)
3073                                         break;
3074                                 err = proc_put_long(&buffer, &left, bit_b, false);
3075                                 if (err)
3076                                         break;
3077                         }
3078
3079                         first = 0; bit_b++;
3080                 }
3081                 if (!err)
3082                         err = proc_put_char(&buffer, &left, '\n');
3083         }
3084
3085         if (!err) {
3086                 if (write) {
3087                         if (*ppos)
3088                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3089                         else
3090                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3091                 }
3092                 kfree(tmp_bitmap);
3093                 *lenp -= left;
3094                 *ppos += *lenp;
3095                 return 0;
3096         } else {
3097                 kfree(tmp_bitmap);
3098                 return err;
3099         }
3100 }
3101
3102 #else /* CONFIG_PROC_SYSCTL */
3103
3104 int proc_dostring(struct ctl_table *table, int write,
3105                   void __user *buffer, size_t *lenp, loff_t *ppos)
3106 {
3107         return -ENOSYS;
3108 }
3109
3110 int proc_dointvec(struct ctl_table *table, int write,
3111                   void __user *buffer, size_t *lenp, loff_t *ppos)
3112 {
3113         return -ENOSYS;
3114 }
3115
3116 int proc_douintvec(struct ctl_table *table, int write,
3117                   void __user *buffer, size_t *lenp, loff_t *ppos)
3118 {
3119         return -ENOSYS;
3120 }
3121
3122 int proc_dointvec_minmax(struct ctl_table *table, int write,
3123                     void __user *buffer, size_t *lenp, loff_t *ppos)
3124 {
3125         return -ENOSYS;
3126 }
3127
3128 int proc_douintvec_minmax(struct ctl_table *table, int write,
3129                           void __user *buffer, size_t *lenp, loff_t *ppos)
3130 {
3131         return -ENOSYS;
3132 }
3133
3134 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3135                     void __user *buffer, size_t *lenp, loff_t *ppos)
3136 {
3137         return -ENOSYS;
3138 }
3139
3140 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3141                     void __user *buffer, size_t *lenp, loff_t *ppos)
3142 {
3143         return -ENOSYS;
3144 }
3145
3146 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3147                              void __user *buffer, size_t *lenp, loff_t *ppos)
3148 {
3149         return -ENOSYS;
3150 }
3151
3152 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3153                     void __user *buffer, size_t *lenp, loff_t *ppos)
3154 {
3155         return -ENOSYS;
3156 }
3157
3158 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3159                                       void __user *buffer,
3160                                       size_t *lenp, loff_t *ppos)
3161 {
3162     return -ENOSYS;
3163 }
3164
3165
3166 #endif /* CONFIG_PROC_SYSCTL */
3167
3168 /*
3169  * No sense putting this after each symbol definition, twice,
3170  * exception granted :-)
3171  */
3172 EXPORT_SYMBOL(proc_dointvec);
3173 EXPORT_SYMBOL(proc_douintvec);
3174 EXPORT_SYMBOL(proc_dointvec_jiffies);
3175 EXPORT_SYMBOL(proc_dointvec_minmax);
3176 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3177 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3178 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3179 EXPORT_SYMBOL(proc_dostring);
3180 EXPORT_SYMBOL(proc_doulongvec_minmax);
3181 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);