kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/aio.h>
  23 #include <linux/mm.h>
  24 #include <linux/swap.h>
  25 #include <linux/slab.h>
  26 #include <linux/sysctl.h>
  27 #include <linux/bitmap.h>
  28 #include <linux/signal.h>
  29 #include <linux/printk.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/security.h>
  32 #include <linux/ctype.h>
  33 #include <linux/kmemleak.h>
  34 #include <linux/fs.h>
  35 #include <linux/init.h>
  36 #include <linux/kernel.h>
  37 #include <linux/kobject.h>
  38 #include <linux/net.h>
  39 #include <linux/sysrq.h>
  40 #include <linux/highuid.h>
  41 #include <linux/writeback.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/compaction.h>
  44 #include <linux/hugetlb.h>
  45 #include <linux/initrd.h>
  46 #include <linux/key.h>
  47 #include <linux/times.h>
  48 #include <linux/limits.h>
  49 #include <linux/dcache.h>
  50 #include <linux/dnotify.h>
  51 #include <linux/syscalls.h>
  52 #include <linux/vmstat.h>
  53 #include <linux/nfs_fs.h>
  54 #include <linux/acpi.h>
  55 #include <linux/reboot.h>
  56 #include <linux/ftrace.h>
  57 #include <linux/perf_event.h>
  58 #include <linux/kprobes.h>
  59 #include <linux/pipe_fs_i.h>
  60 #include <linux/oom.h>
  61 #include <linux/kmod.h>
  62 #include <linux/capability.h>
  63 #include <linux/binfmts.h>
  64 #include <linux/sched/sysctl.h>
  65 #include <linux/sched/coredump.h>
  66 #include <linux/kexec.h>
  67 #include <linux/bpf.h>
  68 #include <linux/mount.h>
  69
  70 #include <linux/uaccess.h>
  71 #include <asm/processor.h>
  72
  73 #ifdef CONFIG_X86
  74 #include <asm/nmi.h>
  75 #include <asm/stacktrace.h>
  76 #include <asm/io.h>
  77 #endif
  78 #ifdef CONFIG_SPARC
  79 #include <asm/setup.h>
  80 #endif
  81 #ifdef CONFIG_BSD_PROCESS_ACCT
  82 #include <linux/acct.h>
  83 #endif
  84 #ifdef CONFIG_RT_MUTEXES
  85 #include <linux/rtmutex.h>
  86 #endif
  87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  88 #include <linux/lockdep.h>
  89 #endif
  90 #ifdef CONFIG_CHR_DEV_SG
  91 #include <scsi/sg.h>
  92 #endif
  93
  94 #ifdef CONFIG_LOCKUP_DETECTOR
  95 #include <linux/nmi.h>
  96 #endif
  97
  98 #if defined(CONFIG_SYSCTL)
  99
 100 /* External variables not in a header file. */
 101 extern int suid_dumpable;
 102 #ifdef CONFIG_COREDUMP
 103 extern int core_uses_pid;
 104 extern char core_pattern[];
 105 extern unsigned int core_pipe_limit;
 106 #endif
 107 extern int pid_max;
 108 extern int pid_max_min, pid_max_max;
 109 extern int percpu_pagelist_fraction;
 110 extern int latencytop_enabled;
 111 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
 112 #ifndef CONFIG_MMU
 113 extern int sysctl_nr_trim_pages;
 114 #endif
 115
 116 /* Constants used for minimum and  maximum */
 117 #ifdef CONFIG_LOCKUP_DETECTOR
 118 static int sixty = 60;
 119 #endif
 120
 121 static int __maybe_unused neg_one = -1;
 122
 123 static int zero;
 124 static int __maybe_unused one = 1;
 125 static int __maybe_unused two = 2;
 126 static int __maybe_unused four = 4;
 127 static unsigned long one_ul = 1;
 128 static int one_hundred = 100;
 129 static int one_thousand = 1000;
 130 #ifdef CONFIG_PRINTK
 131 static int ten_thousand = 10000;
 132 #endif
 133 #ifdef CONFIG_PERF_EVENTS
 134 static int six_hundred_forty_kb = 640 * 1024;
 135 #endif
 136
 137 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 138 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 139
 140 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 141 static int maxolduid = 65535;
 142 static int minolduid;
 143
 144 static int ngroups_max = NGROUPS_MAX;
 145 static const int cap_last_cap = CAP_LAST_CAP;
 146
 147 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
 148 #ifdef CONFIG_DETECT_HUNG_TASK
 149 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 150 #endif
 151
 152 #ifdef CONFIG_INOTIFY_USER
 153 #include <linux/inotify.h>
 154 #endif
 155 #ifdef CONFIG_SPARC
 156 #endif
 157
 158 #ifdef __hppa__
 159 extern int pwrsw_enabled;
 160 #endif
 161
 162 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 163 extern int unaligned_enabled;
 164 #endif
 165
 166 #ifdef CONFIG_IA64
 167 extern int unaligned_dump_stack;
 168 #endif
 169
 170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 171 extern int no_unaligned_warning;
 172 #endif
 173
 174 #ifdef CONFIG_PROC_SYSCTL
 175
 176 /**
 177  * enum sysctl_writes_mode - supported sysctl write modes
 178  *
 179  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 180  *      to be written, and multiple writes on the same sysctl file descriptor
 181  *      will rewrite the sysctl value, regardless of file position. No warning
 182  *      is issued when the initial position is not 0.
 183  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 184  *      not 0.
 185  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 186  *      file position 0 and the value must be fully contained in the buffer
 187  *      sent to the write syscall. If dealing with strings respect the file
 188  *      position, but restrict this to the max length of the buffer, anything
 189  *      passed the max lenght will be ignored. Multiple writes will append
 190  *      to the buffer.
 191  *
 192  * These write modes control how current file position affects the behavior of
 193  * updating sysctl values through the proc interface on each write.
 194  */
 195 enum sysctl_writes_mode {
 196         SYSCTL_WRITES_LEGACY            = -1,
 197         SYSCTL_WRITES_WARN              = 0,
 198         SYSCTL_WRITES_STRICT            = 1,
 199 };
 200
 201 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 202
 203 static int proc_do_cad_pid(struct ctl_table *table, int write,
 204                   void __user *buffer, size_t *lenp, loff_t *ppos);
 205 static int proc_taint(struct ctl_table *table, int write,
 206                                void __user *buffer, size_t *lenp, loff_t *ppos);
 207 #endif
 208
 209 #ifdef CONFIG_PRINTK
 210 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 211                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 212 #endif
 213
 214 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 215                 void __user *buffer, size_t *lenp, loff_t *ppos);
 216 #ifdef CONFIG_COREDUMP
 217 static int proc_dostring_coredump(struct ctl_table *table, int write,
 218                 void __user *buffer, size_t *lenp, loff_t *ppos);
 219 #endif
 220
 221 #ifdef CONFIG_MAGIC_SYSRQ
 222 /* Note: sysrq code uses it's own private copy */
 223 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 224
 225 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 226                                 void __user *buffer, size_t *lenp,
 227                                 loff_t *ppos)
 228 {
 229         int error;
 230
 231         error = proc_dointvec(table, write, buffer, lenp, ppos);
 232         if (error)
 233                 return error;
 234
 235         if (write)
 236                 sysrq_toggle_support(__sysrq_enabled);
 237
 238         return 0;
 239 }
 240
 241 #endif
 242
 243 static struct ctl_table kern_table[];
 244 static struct ctl_table vm_table[];
 245 static struct ctl_table fs_table[];
 246 static struct ctl_table debug_table[];
 247 static struct ctl_table dev_table[];
 248 extern struct ctl_table random_table[];
 249 #ifdef CONFIG_EPOLL
 250 extern struct ctl_table epoll_table[];
 251 #endif
 252
 253 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 254 int sysctl_legacy_va_layout;
 255 #endif
 256
 257 /* The default sysctl tables: */
 258
 259 static struct ctl_table sysctl_base_table[] = {
 260         {
 261                 .procname       = "kernel",
 262                 .mode           = 0555,
 263                 .child          = kern_table,
 264         },
 265         {
 266                 .procname       = "vm",
 267                 .mode           = 0555,
 268                 .child          = vm_table,
 269         },
 270         {
 271                 .procname       = "fs",
 272                 .mode           = 0555,
 273                 .child          = fs_table,
 274         },
 275         {
 276                 .procname       = "debug",
 277                 .mode           = 0555,
 278                 .child          = debug_table,
 279         },
 280         {
 281                 .procname       = "dev",
 282                 .mode           = 0555,
 283                 .child          = dev_table,
 284         },
 285         { }
 286 };
 287
 288 #ifdef CONFIG_SCHED_DEBUG
 289 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 290 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 291 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 292 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 293 #ifdef CONFIG_SMP
 294 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 295 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 296 #endif /* CONFIG_SMP */
 297 #endif /* CONFIG_SCHED_DEBUG */
 298
 299 #ifdef CONFIG_COMPACTION
 300 static int min_extfrag_threshold;
 301 static int max_extfrag_threshold = 1000;
 302 #endif
 303
 304 static struct ctl_table kern_table[] = {
 305         {
 306                 .procname       = "sched_child_runs_first",
 307                 .data           = &sysctl_sched_child_runs_first,
 308                 .maxlen         = sizeof(unsigned int),
 309                 .mode           = 0644,
 310                 .proc_handler   = proc_dointvec,
 311         },
 312 #ifdef CONFIG_SCHED_DEBUG
 313         {
 314                 .procname       = "sched_min_granularity_ns",
 315                 .data           = &sysctl_sched_min_granularity,
 316                 .maxlen         = sizeof(unsigned int),
 317                 .mode           = 0644,
 318                 .proc_handler   = sched_proc_update_handler,
 319                 .extra1         = &min_sched_granularity_ns,
 320                 .extra2         = &max_sched_granularity_ns,
 321         },
 322         {
 323                 .procname       = "sched_latency_ns",
 324                 .data           = &sysctl_sched_latency,
 325                 .maxlen         = sizeof(unsigned int),
 326                 .mode           = 0644,
 327                 .proc_handler   = sched_proc_update_handler,
 328                 .extra1         = &min_sched_granularity_ns,
 329                 .extra2         = &max_sched_granularity_ns,
 330         },
 331         {
 332                 .procname       = "sched_wakeup_granularity_ns",
 333                 .data           = &sysctl_sched_wakeup_granularity,
 334                 .maxlen         = sizeof(unsigned int),
 335                 .mode           = 0644,
 336                 .proc_handler   = sched_proc_update_handler,
 337                 .extra1         = &min_wakeup_granularity_ns,
 338                 .extra2         = &max_wakeup_granularity_ns,
 339         },
 340 #ifdef CONFIG_SMP
 341         {
 342                 .procname       = "sched_tunable_scaling",
 343                 .data           = &sysctl_sched_tunable_scaling,
 344                 .maxlen         = sizeof(enum sched_tunable_scaling),
 345                 .mode           = 0644,
 346                 .proc_handler   = sched_proc_update_handler,
 347                 .extra1         = &min_sched_tunable_scaling,
 348                 .extra2         = &max_sched_tunable_scaling,
 349         },
 350         {
 351                 .procname       = "sched_migration_cost_ns",
 352                 .data           = &sysctl_sched_migration_cost,
 353                 .maxlen         = sizeof(unsigned int),
 354                 .mode           = 0644,
 355                 .proc_handler   = proc_dointvec,
 356         },
 357         {
 358                 .procname       = "sched_nr_migrate",
 359                 .data           = &sysctl_sched_nr_migrate,
 360                 .maxlen         = sizeof(unsigned int),
 361                 .mode           = 0644,
 362                 .proc_handler   = proc_dointvec,
 363         },
 364         {
 365                 .procname       = "sched_time_avg_ms",
 366                 .data           = &sysctl_sched_time_avg,
 367                 .maxlen         = sizeof(unsigned int),
 368                 .mode           = 0644,
 369                 .proc_handler   = proc_dointvec_minmax,
 370                 .extra1         = &one,
 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_user_enabled,
 893                 .maxlen         = sizeof(int),
 894                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
 895                 .proc_handler   = proc_nmi_watchdog,
 896                 .extra1         = &zero,
 897                 .extra2         = &one,
 898         },
 899         {
 900                 .procname       = "watchdog_cpumask",
 901                 .data           = &watchdog_cpumask_bits,
 902                 .maxlen         = NR_CPUS,
 903                 .mode           = 0644,
 904                 .proc_handler   = proc_watchdog_cpumask,
 905         },
 906 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
 907         {
 908                 .procname       = "soft_watchdog",
 909                 .data           = &soft_watchdog_user_enabled,
 910                 .maxlen         = sizeof(int),
 911                 .mode           = 0644,
 912                 .proc_handler   = proc_soft_watchdog,
 913                 .extra1         = &zero,
 914                 .extra2         = &one,
 915         },
 916         {
 917                 .procname       = "softlockup_panic",
 918                 .data           = &softlockup_panic,
 919                 .maxlen         = sizeof(int),
 920                 .mode           = 0644,
 921                 .proc_handler   = proc_dointvec_minmax,
 922                 .extra1         = &zero,
 923                 .extra2         = &one,
 924         },
 925 #ifdef CONFIG_SMP
 926         {
 927                 .procname       = "softlockup_all_cpu_backtrace",
 928                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 929                 .maxlen         = sizeof(int),
 930                 .mode           = 0644,
 931                 .proc_handler   = proc_dointvec_minmax,
 932                 .extra1         = &zero,
 933                 .extra2         = &one,
 934         },
 935 #endif /* CONFIG_SMP */
 936 #endif
 937 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 938         {
 939                 .procname       = "hardlockup_panic",
 940                 .data           = &hardlockup_panic,
 941                 .maxlen         = sizeof(int),
 942                 .mode           = 0644,
 943                 .proc_handler   = proc_dointvec_minmax,
 944                 .extra1         = &zero,
 945                 .extra2         = &one,
 946         },
 947 #ifdef CONFIG_SMP
 948         {
 949                 .procname       = "hardlockup_all_cpu_backtrace",
 950                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
 951                 .maxlen         = sizeof(int),
 952                 .mode           = 0644,
 953                 .proc_handler   = proc_dointvec_minmax,
 954                 .extra1         = &zero,
 955                 .extra2         = &one,
 956         },
 957 #endif /* CONFIG_SMP */
 958 #endif
 959 #endif
 960
 961 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 962         {
 963                 .procname       = "unknown_nmi_panic",
 964                 .data           = &unknown_nmi_panic,
 965                 .maxlen         = sizeof (int),
 966                 .mode           = 0644,
 967                 .proc_handler   = proc_dointvec,
 968         },
 969 #endif
 970 #if defined(CONFIG_X86)
 971         {
 972                 .procname       = "panic_on_unrecovered_nmi",
 973                 .data           = &panic_on_unrecovered_nmi,
 974                 .maxlen         = sizeof(int),
 975                 .mode           = 0644,
 976                 .proc_handler   = proc_dointvec,
 977         },
 978         {
 979                 .procname       = "panic_on_io_nmi",
 980                 .data           = &panic_on_io_nmi,
 981                 .maxlen         = sizeof(int),
 982                 .mode           = 0644,
 983                 .proc_handler   = proc_dointvec,
 984         },
 985 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 986         {
 987                 .procname       = "panic_on_stackoverflow",
 988                 .data           = &sysctl_panic_on_stackoverflow,
 989                 .maxlen         = sizeof(int),
 990                 .mode           = 0644,
 991                 .proc_handler   = proc_dointvec,
 992         },
 993 #endif
 994         {
 995                 .procname       = "bootloader_type",
 996                 .data           = &bootloader_type,
 997                 .maxlen         = sizeof (int),
 998                 .mode           = 0444,
 999                 .proc_handler   = proc_dointvec,
1000         },
1001         {
1002                 .procname       = "bootloader_version",
1003                 .data           = &bootloader_version,
1004                 .maxlen         = sizeof (int),
1005                 .mode           = 0444,
1006                 .proc_handler   = proc_dointvec,
1007         },
1008         {
1009                 .procname       = "io_delay_type",
1010                 .data           = &io_delay_type,
1011                 .maxlen         = sizeof(int),
1012                 .mode           = 0644,
1013                 .proc_handler   = proc_dointvec,
1014         },
1015 #endif
1016 #if defined(CONFIG_MMU)
1017         {
1018                 .procname       = "randomize_va_space",
1019                 .data           = &randomize_va_space,
1020                 .maxlen         = sizeof(int),
1021                 .mode           = 0644,
1022                 .proc_handler   = proc_dointvec,
1023         },
1024 #endif
1025 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1026         {
1027                 .procname       = "spin_retry",
1028                 .data           = &spin_retry,
1029                 .maxlen         = sizeof (int),
1030                 .mode           = 0644,
1031                 .proc_handler   = proc_dointvec,
1032         },
1033 #endif
1034 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1035         {
1036                 .procname       = "acpi_video_flags",
1037                 .data           = &acpi_realmode_flags,
1038                 .maxlen         = sizeof (unsigned long),
1039                 .mode           = 0644,
1040                 .proc_handler   = proc_doulongvec_minmax,
1041         },
1042 #endif
1043 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1044         {
1045                 .procname       = "ignore-unaligned-usertrap",
1046                 .data           = &no_unaligned_warning,
1047                 .maxlen         = sizeof (int),
1048                 .mode           = 0644,
1049                 .proc_handler   = proc_dointvec,
1050         },
1051 #endif
1052 #ifdef CONFIG_IA64
1053         {
1054                 .procname       = "unaligned-dump-stack",
1055                 .data           = &unaligned_dump_stack,
1056                 .maxlen         = sizeof (int),
1057                 .mode           = 0644,
1058                 .proc_handler   = proc_dointvec,
1059         },
1060 #endif
1061 #ifdef CONFIG_DETECT_HUNG_TASK
1062         {
1063                 .procname       = "hung_task_panic",
1064                 .data           = &sysctl_hung_task_panic,
1065                 .maxlen         = sizeof(int),
1066                 .mode           = 0644,
1067                 .proc_handler   = proc_dointvec_minmax,
1068                 .extra1         = &zero,
1069                 .extra2         = &one,
1070         },
1071         {
1072                 .procname       = "hung_task_check_count",
1073                 .data           = &sysctl_hung_task_check_count,
1074                 .maxlen         = sizeof(int),
1075                 .mode           = 0644,
1076                 .proc_handler   = proc_dointvec_minmax,
1077                 .extra1         = &zero,
1078         },
1079         {
1080                 .procname       = "hung_task_timeout_secs",
1081                 .data           = &sysctl_hung_task_timeout_secs,
1082                 .maxlen         = sizeof(unsigned long),
1083                 .mode           = 0644,
1084                 .proc_handler   = proc_dohung_task_timeout_secs,
1085                 .extra2         = &hung_task_timeout_max,
1086         },
1087         {
1088                 .procname       = "hung_task_warnings",
1089                 .data           = &sysctl_hung_task_warnings,
1090                 .maxlen         = sizeof(int),
1091                 .mode           = 0644,
1092                 .proc_handler   = proc_dointvec_minmax,
1093                 .extra1         = &neg_one,
1094         },
1095 #endif
1096 #ifdef CONFIG_RT_MUTEXES
1097         {
1098                 .procname       = "max_lock_depth",
1099                 .data           = &max_lock_depth,
1100                 .maxlen         = sizeof(int),
1101                 .mode           = 0644,
1102                 .proc_handler   = proc_dointvec,
1103         },
1104 #endif
1105         {
1106                 .procname       = "poweroff_cmd",
1107                 .data           = &poweroff_cmd,
1108                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1109                 .mode           = 0644,
1110                 .proc_handler   = proc_dostring,
1111         },
1112 #ifdef CONFIG_KEYS
1113         {
1114                 .procname       = "keys",
1115                 .mode           = 0555,
1116                 .child          = key_sysctls,
1117         },
1118 #endif
1119 #ifdef CONFIG_PERF_EVENTS
1120         /*
1121          * User-space scripts rely on the existence of this file
1122          * as a feature check for perf_events being enabled.
1123          *
1124          * So it's an ABI, do not remove!
1125          */
1126         {
1127                 .procname       = "perf_event_paranoid",
1128                 .data           = &sysctl_perf_event_paranoid,
1129                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dointvec,
1132         },
1133         {
1134                 .procname       = "perf_event_mlock_kb",
1135                 .data           = &sysctl_perf_event_mlock,
1136                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1137                 .mode           = 0644,
1138                 .proc_handler   = proc_dointvec,
1139         },
1140         {
1141                 .procname       = "perf_event_max_sample_rate",
1142                 .data           = &sysctl_perf_event_sample_rate,
1143                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1144                 .mode           = 0644,
1145                 .proc_handler   = perf_proc_update_handler,
1146                 .extra1         = &one,
1147         },
1148         {
1149                 .procname       = "perf_cpu_time_max_percent",
1150                 .data           = &sysctl_perf_cpu_time_max_percent,
1151                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1152                 .mode           = 0644,
1153                 .proc_handler   = perf_cpu_time_max_percent_handler,
1154                 .extra1         = &zero,
1155                 .extra2         = &one_hundred,
1156         },
1157         {
1158                 .procname       = "perf_event_max_stack",
1159                 .data           = &sysctl_perf_event_max_stack,
1160                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
1161                 .mode           = 0644,
1162                 .proc_handler   = perf_event_max_stack_handler,
1163                 .extra1         = &zero,
1164                 .extra2         = &six_hundred_forty_kb,
1165         },
1166         {
1167                 .procname       = "perf_event_max_contexts_per_stack",
1168                 .data           = &sysctl_perf_event_max_contexts_per_stack,
1169                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
1170                 .mode           = 0644,
1171                 .proc_handler   = perf_event_max_stack_handler,
1172                 .extra1         = &zero,
1173                 .extra2         = &one_thousand,
1174         },
1175 #endif
1176         {
1177                 .procname       = "panic_on_warn",
1178                 .data           = &panic_on_warn,
1179                 .maxlen         = sizeof(int),
1180                 .mode           = 0644,
1181                 .proc_handler   = proc_dointvec_minmax,
1182                 .extra1         = &zero,
1183                 .extra2         = &one,
1184         },
1185 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1186         {
1187                 .procname       = "timer_migration",
1188                 .data           = &sysctl_timer_migration,
1189                 .maxlen         = sizeof(unsigned int),
1190                 .mode           = 0644,
1191                 .proc_handler   = timer_migration_handler,
1192                 .extra1         = &zero,
1193                 .extra2         = &one,
1194         },
1195 #endif
1196 #ifdef CONFIG_BPF_SYSCALL
1197         {
1198                 .procname       = "unprivileged_bpf_disabled",
1199                 .data           = &sysctl_unprivileged_bpf_disabled,
1200                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
1201                 .mode           = 0644,
1202                 /* only handle a transition from default "0" to "1" */
1203                 .proc_handler   = proc_dointvec_minmax,
1204                 .extra1         = &one,
1205                 .extra2         = &one,
1206         },
1207 #endif
1208 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1209         {
1210                 .procname       = "panic_on_rcu_stall",
1211                 .data           = &sysctl_panic_on_rcu_stall,
1212                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
1213                 .mode           = 0644,
1214                 .proc_handler   = proc_dointvec_minmax,
1215                 .extra1         = &zero,
1216                 .extra2         = &one,
1217         },
1218 #endif
1219         { }
1220 };
1221
1222 static struct ctl_table vm_table[] = {
1223         {
1224                 .procname       = "overcommit_memory",
1225                 .data           = &sysctl_overcommit_memory,
1226                 .maxlen         = sizeof(sysctl_overcommit_memory),
1227                 .mode           = 0644,
1228                 .proc_handler   = proc_dointvec_minmax,
1229                 .extra1         = &zero,
1230                 .extra2         = &two,
1231         },
1232         {
1233                 .procname       = "panic_on_oom",
1234                 .data           = &sysctl_panic_on_oom,
1235                 .maxlen         = sizeof(sysctl_panic_on_oom),
1236                 .mode           = 0644,
1237                 .proc_handler   = proc_dointvec_minmax,
1238                 .extra1         = &zero,
1239                 .extra2         = &two,
1240         },
1241         {
1242                 .procname       = "oom_kill_allocating_task",
1243                 .data           = &sysctl_oom_kill_allocating_task,
1244                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1245                 .mode           = 0644,
1246                 .proc_handler   = proc_dointvec,
1247         },
1248         {
1249                 .procname       = "oom_dump_tasks",
1250                 .data           = &sysctl_oom_dump_tasks,
1251                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1252                 .mode           = 0644,
1253                 .proc_handler   = proc_dointvec,
1254         },
1255         {
1256                 .procname       = "overcommit_ratio",
1257                 .data           = &sysctl_overcommit_ratio,
1258                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1259                 .mode           = 0644,
1260                 .proc_handler   = overcommit_ratio_handler,
1261         },
1262         {
1263                 .procname       = "overcommit_kbytes",
1264                 .data           = &sysctl_overcommit_kbytes,
1265                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1266                 .mode           = 0644,
1267                 .proc_handler   = overcommit_kbytes_handler,
1268         },
1269         {
1270                 .procname       = "page-cluster",
1271                 .data           = &page_cluster,
1272                 .maxlen         = sizeof(int),
1273                 .mode           = 0644,
1274                 .proc_handler   = proc_dointvec_minmax,
1275                 .extra1         = &zero,
1276         },
1277         {
1278                 .procname       = "dirty_background_ratio",
1279                 .data           = &dirty_background_ratio,
1280                 .maxlen         = sizeof(dirty_background_ratio),
1281                 .mode           = 0644,
1282                 .proc_handler   = dirty_background_ratio_handler,
1283                 .extra1         = &zero,
1284                 .extra2         = &one_hundred,
1285         },
1286         {
1287                 .procname       = "dirty_background_bytes",
1288                 .data           = &dirty_background_bytes,
1289                 .maxlen         = sizeof(dirty_background_bytes),
1290                 .mode           = 0644,
1291                 .proc_handler   = dirty_background_bytes_handler,
1292                 .extra1         = &one_ul,
1293         },
1294         {
1295                 .procname       = "dirty_ratio",
1296                 .data           = &vm_dirty_ratio,
1297                 .maxlen         = sizeof(vm_dirty_ratio),
1298                 .mode           = 0644,
1299                 .proc_handler   = dirty_ratio_handler,
1300                 .extra1         = &zero,
1301                 .extra2         = &one_hundred,
1302         },
1303         {
1304                 .procname       = "dirty_bytes",
1305                 .data           = &vm_dirty_bytes,
1306                 .maxlen         = sizeof(vm_dirty_bytes),
1307                 .mode           = 0644,
1308                 .proc_handler   = dirty_bytes_handler,
1309                 .extra1         = &dirty_bytes_min,
1310         },
1311         {
1312                 .procname       = "dirty_writeback_centisecs",
1313                 .data           = &dirty_writeback_interval,
1314                 .maxlen         = sizeof(dirty_writeback_interval),
1315                 .mode           = 0644,
1316                 .proc_handler   = dirty_writeback_centisecs_handler,
1317         },
1318         {
1319                 .procname       = "dirty_expire_centisecs",
1320                 .data           = &dirty_expire_interval,
1321                 .maxlen         = sizeof(dirty_expire_interval),
1322                 .mode           = 0644,
1323                 .proc_handler   = proc_dointvec_minmax,
1324                 .extra1         = &zero,
1325         },
1326         {
1327                 .procname       = "dirtytime_expire_seconds",
1328                 .data           = &dirtytime_expire_interval,
1329                 .maxlen         = sizeof(dirty_expire_interval),
1330                 .mode           = 0644,
1331                 .proc_handler   = dirtytime_interval_handler,
1332                 .extra1         = &zero,
1333         },
1334         {
1335                 .procname       = "nr_pdflush_threads",
1336                 .mode           = 0444 /* read-only */,
1337                 .proc_handler   = pdflush_proc_obsolete,
1338         },
1339         {
1340                 .procname       = "swappiness",
1341                 .data           = &vm_swappiness,
1342                 .maxlen         = sizeof(vm_swappiness),
1343                 .mode           = 0644,
1344                 .proc_handler   = proc_dointvec_minmax,
1345                 .extra1         = &zero,
1346                 .extra2         = &one_hundred,
1347         },
1348 #ifdef CONFIG_HUGETLB_PAGE
1349         {
1350                 .procname       = "nr_hugepages",
1351                 .data           = NULL,
1352                 .maxlen         = sizeof(unsigned long),
1353                 .mode           = 0644,
1354                 .proc_handler   = hugetlb_sysctl_handler,
1355         },
1356 #ifdef CONFIG_NUMA
1357         {
1358                 .procname       = "nr_hugepages_mempolicy",
1359                 .data           = NULL,
1360                 .maxlen         = sizeof(unsigned long),
1361                 .mode           = 0644,
1362                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1363         },
1364 #endif
1365          {
1366                 .procname       = "hugetlb_shm_group",
1367                 .data           = &sysctl_hugetlb_shm_group,
1368                 .maxlen         = sizeof(gid_t),
1369                 .mode           = 0644,
1370                 .proc_handler   = proc_dointvec,
1371          },
1372          {
1373                 .procname       = "hugepages_treat_as_movable",
1374                 .data           = &hugepages_treat_as_movable,
1375                 .maxlen         = sizeof(int),
1376                 .mode           = 0644,
1377                 .proc_handler   = proc_dointvec,
1378         },
1379         {
1380                 .procname       = "nr_overcommit_hugepages",
1381                 .data           = NULL,
1382                 .maxlen         = sizeof(unsigned long),
1383                 .mode           = 0644,
1384                 .proc_handler   = hugetlb_overcommit_handler,
1385         },
1386 #endif
1387         {
1388                 .procname       = "lowmem_reserve_ratio",
1389                 .data           = &sysctl_lowmem_reserve_ratio,
1390                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1391                 .mode           = 0644,
1392                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1393         },
1394         {
1395                 .procname       = "drop_caches",
1396                 .data           = &sysctl_drop_caches,
1397                 .maxlen         = sizeof(int),
1398                 .mode           = 0644,
1399                 .proc_handler   = drop_caches_sysctl_handler,
1400                 .extra1         = &one,
1401                 .extra2         = &four,
1402         },
1403 #ifdef CONFIG_COMPACTION
1404         {
1405                 .procname       = "compact_memory",
1406                 .data           = &sysctl_compact_memory,
1407                 .maxlen         = sizeof(int),
1408                 .mode           = 0200,
1409                 .proc_handler   = sysctl_compaction_handler,
1410         },
1411         {
1412                 .procname       = "extfrag_threshold",
1413                 .data           = &sysctl_extfrag_threshold,
1414                 .maxlen         = sizeof(int),
1415                 .mode           = 0644,
1416                 .proc_handler   = sysctl_extfrag_handler,
1417                 .extra1         = &min_extfrag_threshold,
1418                 .extra2         = &max_extfrag_threshold,
1419         },
1420         {
1421                 .procname       = "compact_unevictable_allowed",
1422                 .data           = &sysctl_compact_unevictable_allowed,
1423                 .maxlen         = sizeof(int),
1424                 .mode           = 0644,
1425                 .proc_handler   = proc_dointvec,
1426                 .extra1         = &zero,
1427                 .extra2         = &one,
1428         },
1429
1430 #endif /* CONFIG_COMPACTION */
1431         {
1432                 .procname       = "min_free_kbytes",
1433                 .data           = &min_free_kbytes,
1434                 .maxlen         = sizeof(min_free_kbytes),
1435                 .mode           = 0644,
1436                 .proc_handler   = min_free_kbytes_sysctl_handler,
1437                 .extra1         = &zero,
1438         },
1439         {
1440                 .procname       = "watermark_scale_factor",
1441                 .data           = &watermark_scale_factor,
1442                 .maxlen         = sizeof(watermark_scale_factor),
1443                 .mode           = 0644,
1444                 .proc_handler   = watermark_scale_factor_sysctl_handler,
1445                 .extra1         = &one,
1446                 .extra2         = &one_thousand,
1447         },
1448         {
1449                 .procname       = "percpu_pagelist_fraction",
1450                 .data           = &percpu_pagelist_fraction,
1451                 .maxlen         = sizeof(percpu_pagelist_fraction),
1452                 .mode           = 0644,
1453                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1454                 .extra1         = &zero,
1455         },
1456 #ifdef CONFIG_MMU
1457         {
1458                 .procname       = "max_map_count",
1459                 .data           = &sysctl_max_map_count,
1460                 .maxlen         = sizeof(sysctl_max_map_count),
1461                 .mode           = 0644,
1462                 .proc_handler   = proc_dointvec_minmax,
1463                 .extra1         = &zero,
1464         },
1465 #else
1466         {
1467                 .procname       = "nr_trim_pages",
1468                 .data           = &sysctl_nr_trim_pages,
1469                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1470                 .mode           = 0644,
1471                 .proc_handler   = proc_dointvec_minmax,
1472                 .extra1         = &zero,
1473         },
1474 #endif
1475         {
1476                 .procname       = "laptop_mode",
1477                 .data           = &laptop_mode,
1478                 .maxlen         = sizeof(laptop_mode),
1479                 .mode           = 0644,
1480                 .proc_handler   = proc_dointvec_jiffies,
1481         },
1482         {
1483                 .procname       = "block_dump",
1484                 .data           = &block_dump,
1485                 .maxlen         = sizeof(block_dump),
1486                 .mode           = 0644,
1487                 .proc_handler   = proc_dointvec,
1488                 .extra1         = &zero,
1489         },
1490         {
1491                 .procname       = "vfs_cache_pressure",
1492                 .data           = &sysctl_vfs_cache_pressure,
1493                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1494                 .mode           = 0644,
1495                 .proc_handler   = proc_dointvec,
1496                 .extra1         = &zero,
1497         },
1498 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1499         {
1500                 .procname       = "legacy_va_layout",
1501                 .data           = &sysctl_legacy_va_layout,
1502                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1503                 .mode           = 0644,
1504                 .proc_handler   = proc_dointvec,
1505                 .extra1         = &zero,
1506         },
1507 #endif
1508 #ifdef CONFIG_NUMA
1509         {
1510                 .procname       = "zone_reclaim_mode",
1511                 .data           = &node_reclaim_mode,
1512                 .maxlen         = sizeof(node_reclaim_mode),
1513                 .mode           = 0644,
1514                 .proc_handler   = proc_dointvec,
1515                 .extra1         = &zero,
1516         },
1517         {
1518                 .procname       = "min_unmapped_ratio",
1519                 .data           = &sysctl_min_unmapped_ratio,
1520                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1521                 .mode           = 0644,
1522                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1523                 .extra1         = &zero,
1524                 .extra2         = &one_hundred,
1525         },
1526         {
1527                 .procname       = "min_slab_ratio",
1528                 .data           = &sysctl_min_slab_ratio,
1529                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1530                 .mode           = 0644,
1531                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1532                 .extra1         = &zero,
1533                 .extra2         = &one_hundred,
1534         },
1535 #endif
1536 #ifdef CONFIG_SMP
1537         {
1538                 .procname       = "stat_interval",
1539                 .data           = &sysctl_stat_interval,
1540                 .maxlen         = sizeof(sysctl_stat_interval),
1541                 .mode           = 0644,
1542                 .proc_handler   = proc_dointvec_jiffies,
1543         },
1544         {
1545                 .procname       = "stat_refresh",
1546                 .data           = NULL,
1547                 .maxlen         = 0,
1548                 .mode           = 0600,
1549                 .proc_handler   = vmstat_refresh,
1550         },
1551 #endif
1552 #ifdef CONFIG_MMU
1553         {
1554                 .procname       = "mmap_min_addr",
1555                 .data           = &dac_mmap_min_addr,
1556                 .maxlen         = sizeof(unsigned long),
1557                 .mode           = 0644,
1558                 .proc_handler   = mmap_min_addr_handler,
1559         },
1560 #endif
1561 #ifdef CONFIG_NUMA
1562         {
1563                 .procname       = "numa_zonelist_order",
1564                 .data           = &numa_zonelist_order,
1565                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1566                 .mode           = 0644,
1567                 .proc_handler   = numa_zonelist_order_handler,
1568         },
1569 #endif
1570 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1571    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1572         {
1573                 .procname       = "vdso_enabled",
1574 #ifdef CONFIG_X86_32
1575                 .data           = &vdso32_enabled,
1576                 .maxlen         = sizeof(vdso32_enabled),
1577 #else
1578                 .data           = &vdso_enabled,
1579                 .maxlen         = sizeof(vdso_enabled),
1580 #endif
1581                 .mode           = 0644,
1582                 .proc_handler   = proc_dointvec,
1583                 .extra1         = &zero,
1584         },
1585 #endif
1586 #ifdef CONFIG_HIGHMEM
1587         {
1588                 .procname       = "highmem_is_dirtyable",
1589                 .data           = &vm_highmem_is_dirtyable,
1590                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1591                 .mode           = 0644,
1592                 .proc_handler   = proc_dointvec_minmax,
1593                 .extra1         = &zero,
1594                 .extra2         = &one,
1595         },
1596 #endif
1597 #ifdef CONFIG_MEMORY_FAILURE
1598         {
1599                 .procname       = "memory_failure_early_kill",
1600                 .data           = &sysctl_memory_failure_early_kill,
1601                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1602                 .mode           = 0644,
1603                 .proc_handler   = proc_dointvec_minmax,
1604                 .extra1         = &zero,
1605                 .extra2         = &one,
1606         },
1607         {
1608                 .procname       = "memory_failure_recovery",
1609                 .data           = &sysctl_memory_failure_recovery,
1610                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1611                 .mode           = 0644,
1612                 .proc_handler   = proc_dointvec_minmax,
1613                 .extra1         = &zero,
1614                 .extra2         = &one,
1615         },
1616 #endif
1617         {
1618                 .procname       = "user_reserve_kbytes",
1619                 .data           = &sysctl_user_reserve_kbytes,
1620                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1621                 .mode           = 0644,
1622                 .proc_handler   = proc_doulongvec_minmax,
1623         },
1624         {
1625                 .procname       = "admin_reserve_kbytes",
1626                 .data           = &sysctl_admin_reserve_kbytes,
1627                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1628                 .mode           = 0644,
1629                 .proc_handler   = proc_doulongvec_minmax,
1630         },
1631 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1632         {
1633                 .procname       = "mmap_rnd_bits",
1634                 .data           = &mmap_rnd_bits,
1635                 .maxlen         = sizeof(mmap_rnd_bits),
1636                 .mode           = 0600,
1637                 .proc_handler   = proc_dointvec_minmax,
1638                 .extra1         = (void *)&mmap_rnd_bits_min,
1639                 .extra2         = (void *)&mmap_rnd_bits_max,
1640         },
1641 #endif
1642 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1643         {
1644                 .procname       = "mmap_rnd_compat_bits",
1645                 .data           = &mmap_rnd_compat_bits,
1646                 .maxlen         = sizeof(mmap_rnd_compat_bits),
1647                 .mode           = 0600,
1648                 .proc_handler   = proc_dointvec_minmax,
1649                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
1650                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
1651         },
1652 #endif
1653         { }
1654 };
1655
1656 static struct ctl_table fs_table[] = {
1657         {
1658                 .procname       = "inode-nr",
1659                 .data           = &inodes_stat,
1660                 .maxlen         = 2*sizeof(long),
1661                 .mode           = 0444,
1662                 .proc_handler   = proc_nr_inodes,
1663         },
1664         {
1665                 .procname       = "inode-state",
1666                 .data           = &inodes_stat,
1667                 .maxlen         = 7*sizeof(long),
1668                 .mode           = 0444,
1669                 .proc_handler   = proc_nr_inodes,
1670         },
1671         {
1672                 .procname       = "file-nr",
1673                 .data           = &files_stat,
1674                 .maxlen         = sizeof(files_stat),
1675                 .mode           = 0444,
1676                 .proc_handler   = proc_nr_files,
1677         },
1678         {
1679                 .procname       = "file-max",
1680                 .data           = &files_stat.max_files,
1681                 .maxlen         = sizeof(files_stat.max_files),
1682                 .mode           = 0644,
1683                 .proc_handler   = proc_doulongvec_minmax,
1684         },
1685         {
1686                 .procname       = "nr_open",
1687                 .data           = &sysctl_nr_open,
1688                 .maxlen         = sizeof(unsigned int),
1689                 .mode           = 0644,
1690                 .proc_handler   = proc_dointvec_minmax,
1691                 .extra1         = &sysctl_nr_open_min,
1692                 .extra2         = &sysctl_nr_open_max,
1693         },
1694         {
1695                 .procname       = "dentry-state",
1696                 .data           = &dentry_stat,
1697                 .maxlen         = 6*sizeof(long),
1698                 .mode           = 0444,
1699                 .proc_handler   = proc_nr_dentry,
1700         },
1701         {
1702                 .procname       = "overflowuid",
1703                 .data           = &fs_overflowuid,
1704                 .maxlen         = sizeof(int),
1705                 .mode           = 0644,
1706                 .proc_handler   = proc_dointvec_minmax,
1707                 .extra1         = &minolduid,
1708                 .extra2         = &maxolduid,
1709         },
1710         {
1711                 .procname       = "overflowgid",
1712                 .data           = &fs_overflowgid,
1713                 .maxlen         = sizeof(int),
1714                 .mode           = 0644,
1715                 .proc_handler   = proc_dointvec_minmax,
1716                 .extra1         = &minolduid,
1717                 .extra2         = &maxolduid,
1718         },
1719 #ifdef CONFIG_FILE_LOCKING
1720         {
1721                 .procname       = "leases-enable",
1722                 .data           = &leases_enable,
1723                 .maxlen         = sizeof(int),
1724                 .mode           = 0644,
1725                 .proc_handler   = proc_dointvec,
1726         },
1727 #endif
1728 #ifdef CONFIG_DNOTIFY
1729         {
1730                 .procname       = "dir-notify-enable",
1731                 .data           = &dir_notify_enable,
1732                 .maxlen         = sizeof(int),
1733                 .mode           = 0644,
1734                 .proc_handler   = proc_dointvec,
1735         },
1736 #endif
1737 #ifdef CONFIG_MMU
1738 #ifdef CONFIG_FILE_LOCKING
1739         {
1740                 .procname       = "lease-break-time",
1741                 .data           = &lease_break_time,
1742                 .maxlen         = sizeof(int),
1743                 .mode           = 0644,
1744                 .proc_handler   = proc_dointvec,
1745         },
1746 #endif
1747 #ifdef CONFIG_AIO
1748         {
1749                 .procname       = "aio-nr",
1750                 .data           = &aio_nr,
1751                 .maxlen         = sizeof(aio_nr),
1752                 .mode           = 0444,
1753                 .proc_handler   = proc_doulongvec_minmax,
1754         },
1755         {
1756                 .procname       = "aio-max-nr",
1757                 .data           = &aio_max_nr,
1758                 .maxlen         = sizeof(aio_max_nr),
1759                 .mode           = 0644,
1760                 .proc_handler   = proc_doulongvec_minmax,
1761         },
1762 #endif /* CONFIG_AIO */
1763 #ifdef CONFIG_INOTIFY_USER
1764         {
1765                 .procname       = "inotify",
1766                 .mode           = 0555,
1767                 .child          = inotify_table,
1768         },
1769 #endif
1770 #ifdef CONFIG_EPOLL
1771         {
1772                 .procname       = "epoll",
1773                 .mode           = 0555,
1774                 .child          = epoll_table,
1775         },
1776 #endif
1777 #endif
1778         {
1779                 .procname       = "protected_symlinks",
1780                 .data           = &sysctl_protected_symlinks,
1781                 .maxlen         = sizeof(int),
1782                 .mode           = 0600,
1783                 .proc_handler   = proc_dointvec_minmax,
1784                 .extra1         = &zero,
1785                 .extra2         = &one,
1786         },
1787         {
1788                 .procname       = "protected_hardlinks",
1789                 .data           = &sysctl_protected_hardlinks,
1790                 .maxlen         = sizeof(int),
1791                 .mode           = 0600,
1792                 .proc_handler   = proc_dointvec_minmax,
1793                 .extra1         = &zero,
1794                 .extra2         = &one,
1795         },
1796         {
1797                 .procname       = "suid_dumpable",
1798                 .data           = &suid_dumpable,
1799                 .maxlen         = sizeof(int),
1800                 .mode           = 0644,
1801                 .proc_handler   = proc_dointvec_minmax_coredump,
1802                 .extra1         = &zero,
1803                 .extra2         = &two,
1804         },
1805 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1806         {
1807                 .procname       = "binfmt_misc",
1808                 .mode           = 0555,
1809                 .child          = sysctl_mount_point,
1810         },
1811 #endif
1812         {
1813                 .procname       = "pipe-max-size",
1814                 .data           = &pipe_max_size,
1815                 .maxlen         = sizeof(pipe_max_size),
1816                 .mode           = 0644,
1817                 .proc_handler   = &pipe_proc_fn,
1818                 .extra1         = &pipe_min_size,
1819         },
1820         {
1821                 .procname       = "pipe-user-pages-hard",
1822                 .data           = &pipe_user_pages_hard,
1823                 .maxlen         = sizeof(pipe_user_pages_hard),
1824                 .mode           = 0644,
1825                 .proc_handler   = proc_doulongvec_minmax,
1826         },
1827         {
1828                 .procname       = "pipe-user-pages-soft",
1829                 .data           = &pipe_user_pages_soft,
1830                 .maxlen         = sizeof(pipe_user_pages_soft),
1831                 .mode           = 0644,
1832                 .proc_handler   = proc_doulongvec_minmax,
1833         },
1834         {
1835                 .procname       = "mount-max",
1836                 .data           = &sysctl_mount_max,
1837                 .maxlen         = sizeof(unsigned int),
1838                 .mode           = 0644,
1839                 .proc_handler   = proc_dointvec_minmax,
1840                 .extra1         = &one,
1841         },
1842         { }
1843 };
1844
1845 static struct ctl_table debug_table[] = {
1846 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1847         {
1848                 .procname       = "exception-trace",
1849                 .data           = &show_unhandled_signals,
1850                 .maxlen         = sizeof(int),
1851                 .mode           = 0644,
1852                 .proc_handler   = proc_dointvec
1853         },
1854 #endif
1855 #if defined(CONFIG_OPTPROBES)
1856         {
1857                 .procname       = "kprobes-optimization",
1858                 .data           = &sysctl_kprobes_optimization,
1859                 .maxlen         = sizeof(int),
1860                 .mode           = 0644,
1861                 .proc_handler   = proc_kprobes_optimization_handler,
1862                 .extra1         = &zero,
1863                 .extra2         = &one,
1864         },
1865 #endif
1866         { }
1867 };
1868
1869 static struct ctl_table dev_table[] = {
1870         { }
1871 };
1872
1873 int __init sysctl_init(void)
1874 {
1875         struct ctl_table_header *hdr;
1876
1877         hdr = register_sysctl_table(sysctl_base_table);
1878         kmemleak_not_leak(hdr);
1879         return 0;
1880 }
1881
1882 #endif /* CONFIG_SYSCTL */
1883
1884 /*
1885  * /proc/sys support
1886  */
1887
1888 #ifdef CONFIG_PROC_SYSCTL
1889
1890 static int _proc_do_string(char *data, int maxlen, int write,
1891                            char __user *buffer,
1892                            size_t *lenp, loff_t *ppos)
1893 {
1894         size_t len;
1895         char __user *p;
1896         char c;
1897
1898         if (!data || !maxlen || !*lenp) {
1899                 *lenp = 0;
1900                 return 0;
1901         }
1902
1903         if (write) {
1904                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1905                         /* Only continue writes not past the end of buffer. */
1906                         len = strlen(data);
1907                         if (len > maxlen - 1)
1908                                 len = maxlen - 1;
1909
1910                         if (*ppos > len)
1911                                 return 0;
1912                         len = *ppos;
1913                 } else {
1914                         /* Start writing from beginning of buffer. */
1915                         len = 0;
1916                 }
1917
1918                 *ppos += *lenp;
1919                 p = buffer;
1920                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1921                         if (get_user(c, p++))
1922                                 return -EFAULT;
1923                         if (c == 0 || c == '\n')
1924                                 break;
1925                         data[len++] = c;
1926                 }
1927                 data[len] = 0;
1928         } else {
1929                 len = strlen(data);
1930                 if (len > maxlen)
1931                         len = maxlen;
1932
1933                 if (*ppos > len) {
1934                         *lenp = 0;
1935                         return 0;
1936                 }
1937
1938                 data += *ppos;
1939                 len  -= *ppos;
1940
1941                 if (len > *lenp)
1942                         len = *lenp;
1943                 if (len)
1944                         if (copy_to_user(buffer, data, len))
1945                                 return -EFAULT;
1946                 if (len < *lenp) {
1947                         if (put_user('\n', buffer + len))
1948                                 return -EFAULT;
1949                         len++;
1950                 }
1951                 *lenp = len;
1952                 *ppos += len;
1953         }
1954         return 0;
1955 }
1956
1957 static void warn_sysctl_write(struct ctl_table *table)
1958 {
1959         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1960                 "This will not be supported in the future. To silence this\n"
1961                 "warning, set kernel.sysctl_writes_strict = -1\n",
1962                 current->comm, table->procname);
1963 }
1964
1965 /**
1966  * proc_first_pos_non_zero_ignore - check if firs position is allowed
1967  * @ppos: file position
1968  * @table: the sysctl table
1969  *
1970  * Returns true if the first position is non-zero and the sysctl_writes_strict
1971  * mode indicates this is not allowed for numeric input types. String proc
1972  * hadlers can ignore the return value.
1973  */
1974 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1975                                            struct ctl_table *table)
1976 {
1977         if (!*ppos)
1978                 return false;
1979
1980         switch (sysctl_writes_strict) {
1981         case SYSCTL_WRITES_STRICT:
1982                 return true;
1983         case SYSCTL_WRITES_WARN:
1984                 warn_sysctl_write(table);
1985                 return false;
1986         default:
1987                 return false;
1988         }
1989 }
1990
1991 /**
1992  * proc_dostring - read a string sysctl
1993  * @table: the sysctl table
1994  * @write: %TRUE if this is a write to the sysctl file
1995  * @buffer: the user buffer
1996  * @lenp: the size of the user buffer
1997  * @ppos: file position
1998  *
1999  * Reads/writes a string from/to the user buffer. If the kernel
2000  * buffer provided is not large enough to hold the string, the
2001  * string is truncated. The copied string is %NULL-terminated.
2002  * If the string is being read by the user process, it is copied
2003  * and a newline '\n' is added. It is truncated if the buffer is
2004  * not large enough.
2005  *
2006  * Returns 0 on success.
2007  */
2008 int proc_dostring(struct ctl_table *table, int write,
2009                   void __user *buffer, size_t *lenp, loff_t *ppos)
2010 {
2011         if (write)
2012                 proc_first_pos_non_zero_ignore(ppos, table);
2013
2014         return _proc_do_string((char *)(table->data), table->maxlen, write,
2015                                (char __user *)buffer, lenp, ppos);
2016 }
2017
2018 static size_t proc_skip_spaces(char **buf)
2019 {
2020         size_t ret;
2021         char *tmp = skip_spaces(*buf);
2022         ret = tmp - *buf;
2023         *buf = tmp;
2024         return ret;
2025 }
2026
2027 static void proc_skip_char(char **buf, size_t *size, const char v)
2028 {
2029         while (*size) {
2030                 if (**buf != v)
2031                         break;
2032                 (*size)--;
2033                 (*buf)++;
2034         }
2035 }
2036
2037 #define TMPBUFLEN 22
2038 /**
2039  * proc_get_long - reads an ASCII formatted integer from a user buffer
2040  *
2041  * @buf: a kernel buffer
2042  * @size: size of the kernel buffer
2043  * @val: this is where the number will be stored
2044  * @neg: set to %TRUE if number is negative
2045  * @perm_tr: a vector which contains the allowed trailers
2046  * @perm_tr_len: size of the perm_tr vector
2047  * @tr: pointer to store the trailer character
2048  *
2049  * In case of success %0 is returned and @buf and @size are updated with
2050  * the amount of bytes read. If @tr is non-NULL and a trailing
2051  * character exists (size is non-zero after returning from this
2052  * function), @tr is updated with the trailing character.
2053  */
2054 static int proc_get_long(char **buf, size_t *size,
2055                           unsigned long *val, bool *neg,
2056                           const char *perm_tr, unsigned perm_tr_len, char *tr)
2057 {
2058         int len;
2059         char *p, tmp[TMPBUFLEN];
2060
2061         if (!*size)
2062                 return -EINVAL;
2063
2064         len = *size;
2065         if (len > TMPBUFLEN - 1)
2066                 len = TMPBUFLEN - 1;
2067
2068         memcpy(tmp, *buf, len);
2069
2070         tmp[len] = 0;
2071         p = tmp;
2072         if (*p == '-' && *size > 1) {
2073                 *neg = true;
2074                 p++;
2075         } else
2076                 *neg = false;
2077         if (!isdigit(*p))
2078                 return -EINVAL;
2079
2080         *val = simple_strtoul(p, &p, 0);
2081
2082         len = p - tmp;
2083
2084         /* We don't know if the next char is whitespace thus we may accept
2085          * invalid integers (e.g. 1234...a) or two integers instead of one
2086          * (e.g. 123...1). So lets not allow such large numbers. */
2087         if (len == TMPBUFLEN - 1)
2088                 return -EINVAL;
2089
2090         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2091                 return -EINVAL;
2092
2093         if (tr && (len < *size))
2094                 *tr = *p;
2095
2096         *buf += len;
2097         *size -= len;
2098
2099         return 0;
2100 }
2101
2102 /**
2103  * proc_put_long - converts an integer to a decimal ASCII formatted string
2104  *
2105  * @buf: the user buffer
2106  * @size: the size of the user buffer
2107  * @val: the integer to be converted
2108  * @neg: sign of the number, %TRUE for negative
2109  *
2110  * In case of success %0 is returned and @buf and @size are updated with
2111  * the amount of bytes written.
2112  */
2113 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2114                           bool neg)
2115 {
2116         int len;
2117         char tmp[TMPBUFLEN], *p = tmp;
2118
2119         sprintf(p, "%s%lu", neg ? "-" : "", val);
2120         len = strlen(tmp);
2121         if (len > *size)
2122                 len = *size;
2123         if (copy_to_user(*buf, tmp, len))
2124                 return -EFAULT;
2125         *size -= len;
2126         *buf += len;
2127         return 0;
2128 }
2129 #undef TMPBUFLEN
2130
2131 static int proc_put_char(void __user **buf, size_t *size, char c)
2132 {
2133         if (*size) {
2134                 char __user **buffer = (char __user **)buf;
2135                 if (put_user(c, *buffer))
2136                         return -EFAULT;
2137                 (*size)--, (*buffer)++;
2138                 *buf = *buffer;
2139         }
2140         return 0;
2141 }
2142
2143 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2144                                  int *valp,
2145                                  int write, void *data)
2146 {
2147         if (write) {
2148                 if (*negp) {
2149                         if (*lvalp > (unsigned long) INT_MAX + 1)
2150                                 return -EINVAL;
2151                         *valp = -*lvalp;
2152                 } else {
2153                         if (*lvalp > (unsigned long) INT_MAX)
2154                                 return -EINVAL;
2155                         *valp = *lvalp;
2156                 }
2157         } else {
2158                 int val = *valp;
2159                 if (val < 0) {
2160                         *negp = true;
2161                         *lvalp = -(unsigned long)val;
2162                 } else {
2163                         *negp = false;
2164                         *lvalp = (unsigned long)val;
2165                 }
2166         }
2167         return 0;
2168 }
2169
2170 static int do_proc_douintvec_conv(unsigned long *lvalp,
2171                                   unsigned int *valp,
2172                                   int write, void *data)
2173 {
2174         if (write) {
2175                 if (*lvalp > UINT_MAX)
2176                         return -EINVAL;
2177                 *valp = *lvalp;
2178         } else {
2179                 unsigned int val = *valp;
2180                 *lvalp = (unsigned long)val;
2181         }
2182         return 0;
2183 }
2184
2185 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2186
2187 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2188                   int write, void __user *buffer,
2189                   size_t *lenp, loff_t *ppos,
2190                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2191                               int write, void *data),
2192                   void *data)
2193 {
2194         int *i, vleft, first = 1, err = 0;
2195         size_t left;
2196         char *kbuf = NULL, *p;
2197
2198         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2199                 *lenp = 0;
2200                 return 0;
2201         }
2202
2203         i = (int *) tbl_data;
2204         vleft = table->maxlen / sizeof(*i);
2205         left = *lenp;
2206
2207         if (!conv)
2208                 conv = do_proc_dointvec_conv;
2209
2210         if (write) {
2211                 if (proc_first_pos_non_zero_ignore(ppos, table))
2212                         goto out;
2213
2214                 if (left > PAGE_SIZE - 1)
2215                         left = PAGE_SIZE - 1;
2216                 p = kbuf = memdup_user_nul(buffer, left);
2217                 if (IS_ERR(kbuf))
2218                         return PTR_ERR(kbuf);
2219         }
2220
2221         for (; left && vleft--; i++, first=0) {
2222                 unsigned long lval;
2223                 bool neg;
2224
2225                 if (write) {
2226                         left -= proc_skip_spaces(&p);
2227
2228                         if (!left)
2229                                 break;
2230                         err = proc_get_long(&p, &left, &lval, &neg,
2231                                              proc_wspace_sep,
2232                                              sizeof(proc_wspace_sep), NULL);
2233                         if (err)
2234                                 break;
2235                         if (conv(&neg, &lval, i, 1, data)) {
2236                                 err = -EINVAL;
2237                                 break;
2238                         }
2239                 } else {
2240                         if (conv(&neg, &lval, i, 0, data)) {
2241                                 err = -EINVAL;
2242                                 break;
2243                         }
2244                         if (!first)
2245                                 err = proc_put_char(&buffer, &left, '\t');
2246                         if (err)
2247                                 break;
2248                         err = proc_put_long(&buffer, &left, lval, neg);
2249                         if (err)
2250                                 break;
2251                 }
2252         }
2253
2254         if (!write && !first && left && !err)
2255                 err = proc_put_char(&buffer, &left, '\n');
2256         if (write && !err && left)
2257                 left -= proc_skip_spaces(&p);
2258         if (write) {
2259                 kfree(kbuf);
2260                 if (first)
2261                         return err ? : -EINVAL;
2262         }
2263         *lenp -= left;
2264 out:
2265         *ppos += *lenp;
2266         return err;
2267 }
2268
2269 static int do_proc_dointvec(struct ctl_table *table, int write,
2270                   void __user *buffer, size_t *lenp, loff_t *ppos,
2271                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2272                               int write, void *data),
2273                   void *data)
2274 {
2275         return __do_proc_dointvec(table->data, table, write,
2276                         buffer, lenp, ppos, conv, data);
2277 }
2278
2279 static int do_proc_douintvec_w(unsigned int *tbl_data,
2280                                struct ctl_table *table,
2281                                void __user *buffer,
2282                                size_t *lenp, loff_t *ppos,
2283                                int (*conv)(unsigned long *lvalp,
2284                                            unsigned int *valp,
2285                                            int write, void *data),
2286                                void *data)
2287 {
2288         unsigned long lval;
2289         int err = 0;
2290         size_t left;
2291         bool neg;
2292         char *kbuf = NULL, *p;
2293
2294         left = *lenp;
2295
2296         if (proc_first_pos_non_zero_ignore(ppos, table))
2297                 goto bail_early;
2298
2299         if (left > PAGE_SIZE - 1)
2300                 left = PAGE_SIZE - 1;
2301
2302         p = kbuf = memdup_user_nul(buffer, left);
2303         if (IS_ERR(kbuf))
2304                 return -EINVAL;
2305
2306         left -= proc_skip_spaces(&p);
2307         if (!left) {
2308                 err = -EINVAL;
2309                 goto out_free;
2310         }
2311
2312         err = proc_get_long(&p, &left, &lval, &neg,
2313                              proc_wspace_sep,
2314                              sizeof(proc_wspace_sep), NULL);
2315         if (err || neg) {
2316                 err = -EINVAL;
2317                 goto out_free;
2318         }
2319
2320         if (conv(&lval, tbl_data, 1, data)) {
2321                 err = -EINVAL;
2322                 goto out_free;
2323         }
2324
2325         if (!err && left)
2326                 left -= proc_skip_spaces(&p);
2327
2328 out_free:
2329         kfree(kbuf);
2330         if (err)
2331                 return -EINVAL;
2332
2333         return 0;
2334
2335         /* This is in keeping with old __do_proc_dointvec() */
2336 bail_early:
2337         *ppos += *lenp;
2338         return err;
2339 }
2340
2341 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2342                                size_t *lenp, loff_t *ppos,
2343                                int (*conv)(unsigned long *lvalp,
2344                                            unsigned int *valp,
2345                                            int write, void *data),
2346                                void *data)
2347 {
2348         unsigned long lval;
2349         int err = 0;
2350         size_t left;
2351
2352         left = *lenp;
2353
2354         if (conv(&lval, tbl_data, 0, data)) {
2355                 err = -EINVAL;
2356                 goto out;
2357         }
2358
2359         err = proc_put_long(&buffer, &left, lval, false);
2360         if (err || !left)
2361                 goto out;
2362
2363         err = proc_put_char(&buffer, &left, '\n');
2364
2365 out:
2366         *lenp -= left;
2367         *ppos += *lenp;
2368
2369         return err;
2370 }
2371
2372 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2373                                int write, void __user *buffer,
2374                                size_t *lenp, loff_t *ppos,
2375                                int (*conv)(unsigned long *lvalp,
2376                                            unsigned int *valp,
2377                                            int write, void *data),
2378                                void *data)
2379 {
2380         unsigned int *i, vleft;
2381
2382         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2383                 *lenp = 0;
2384                 return 0;
2385         }
2386
2387         i = (unsigned int *) tbl_data;
2388         vleft = table->maxlen / sizeof(*i);
2389
2390         /*
2391          * Arrays are not supported, keep this simple. *Do not* add
2392          * support for them.
2393          */
2394         if (vleft != 1) {
2395                 *lenp = 0;
2396                 return -EINVAL;
2397         }
2398
2399         if (!conv)
2400                 conv = do_proc_douintvec_conv;
2401
2402         if (write)
2403                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2404                                            conv, data);
2405         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2406 }
2407
2408 static int do_proc_douintvec(struct ctl_table *table, int write,
2409                              void __user *buffer, size_t *lenp, loff_t *ppos,
2410                              int (*conv)(unsigned long *lvalp,
2411                                          unsigned int *valp,
2412                                          int write, void *data),
2413                              void *data)
2414 {
2415         return __do_proc_douintvec(table->data, table, write,
2416                                    buffer, lenp, ppos, conv, data);
2417 }
2418
2419 /**
2420  * proc_dointvec - read a vector of integers
2421  * @table: the sysctl table
2422  * @write: %TRUE if this is a write to the sysctl file
2423  * @buffer: the user buffer
2424  * @lenp: the size of the user buffer
2425  * @ppos: file position
2426  *
2427  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2428  * values from/to the user buffer, treated as an ASCII string.
2429  *
2430  * Returns 0 on success.
2431  */
2432 int proc_dointvec(struct ctl_table *table, int write,
2433                      void __user *buffer, size_t *lenp, loff_t *ppos)
2434 {
2435         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2436 }
2437
2438 /**
2439  * proc_douintvec - read a vector of unsigned integers
2440  * @table: the sysctl table
2441  * @write: %TRUE if this is a write to the sysctl file
2442  * @buffer: the user buffer
2443  * @lenp: the size of the user buffer
2444  * @ppos: file position
2445  *
2446  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2447  * values from/to the user buffer, treated as an ASCII string.
2448  *
2449  * Returns 0 on success.
2450  */
2451 int proc_douintvec(struct ctl_table *table, int write,
2452                      void __user *buffer, size_t *lenp, loff_t *ppos)
2453 {
2454         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2455                                  do_proc_douintvec_conv, NULL);
2456 }
2457
2458 /*
2459  * Taint values can only be increased
2460  * This means we can safely use a temporary.
2461  */
2462 static int proc_taint(struct ctl_table *table, int write,
2463                                void __user *buffer, size_t *lenp, loff_t *ppos)
2464 {
2465         struct ctl_table t;
2466         unsigned long tmptaint = get_taint();
2467         int err;
2468
2469         if (write && !capable(CAP_SYS_ADMIN))
2470                 return -EPERM;
2471
2472         t = *table;
2473         t.data = &tmptaint;
2474         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2475         if (err < 0)
2476                 return err;
2477
2478         if (write) {
2479                 /*
2480                  * Poor man's atomic or. Not worth adding a primitive
2481                  * to everyone's atomic.h for this
2482                  */
2483                 int i;
2484                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2485                         if ((tmptaint >> i) & 1)
2486                                 add_taint(i, LOCKDEP_STILL_OK);
2487                 }
2488         }
2489
2490         return err;
2491 }
2492
2493 #ifdef CONFIG_PRINTK
2494 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2495                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2496 {
2497         if (write && !capable(CAP_SYS_ADMIN))
2498                 return -EPERM;
2499
2500         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2501 }
2502 #endif
2503
2504 struct do_proc_dointvec_minmax_conv_param {
2505         int *min;
2506         int *max;
2507 };
2508
2509 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2510                                         int *valp,
2511                                         int write, void *data)
2512 {
2513         struct do_proc_dointvec_minmax_conv_param *param = data;
2514         if (write) {
2515                 int val = *negp ? -*lvalp : *lvalp;
2516                 if ((param->min && *param->min > val) ||
2517                     (param->max && *param->max < val))
2518                         return -EINVAL;
2519                 *valp = val;
2520         } else {
2521                 int val = *valp;
2522                 if (val < 0) {
2523                         *negp = true;
2524                         *lvalp = -(unsigned long)val;
2525                 } else {
2526                         *negp = false;
2527                         *lvalp = (unsigned long)val;
2528                 }
2529         }
2530         return 0;
2531 }
2532
2533 /**
2534  * proc_dointvec_minmax - read a vector of integers with min/max values
2535  * @table: the sysctl table
2536  * @write: %TRUE if this is a write to the sysctl file
2537  * @buffer: the user buffer
2538  * @lenp: the size of the user buffer
2539  * @ppos: file position
2540  *
2541  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2542  * values from/to the user buffer, treated as an ASCII string.
2543  *
2544  * This routine will ensure the values are within the range specified by
2545  * table->extra1 (min) and table->extra2 (max).
2546  *
2547  * Returns 0 on success.
2548  */
2549 int proc_dointvec_minmax(struct ctl_table *table, int write,
2550                   void __user *buffer, size_t *lenp, loff_t *ppos)
2551 {
2552         struct do_proc_dointvec_minmax_conv_param param = {
2553                 .min = (int *) table->extra1,
2554                 .max = (int *) table->extra2,
2555         };
2556         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2557                                 do_proc_dointvec_minmax_conv, &param);
2558 }
2559
2560 struct do_proc_douintvec_minmax_conv_param {
2561         unsigned int *min;
2562         unsigned int *max;
2563 };
2564
2565 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2566                                          unsigned int *valp,
2567                                          int write, void *data)
2568 {
2569         struct do_proc_douintvec_minmax_conv_param *param = data;
2570
2571         if (write) {
2572                 unsigned int val = *lvalp;
2573
2574                 if ((param->min && *param->min > val) ||
2575                     (param->max && *param->max < val))
2576                         return -ERANGE;
2577
2578                 if (*lvalp > UINT_MAX)
2579                         return -EINVAL;
2580                 *valp = val;
2581         } else {
2582                 unsigned int val = *valp;
2583                 *lvalp = (unsigned long) val;
2584         }
2585
2586         return 0;
2587 }
2588
2589 /**
2590  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2591  * @table: the sysctl table
2592  * @write: %TRUE if this is a write to the sysctl file
2593  * @buffer: the user buffer
2594  * @lenp: the size of the user buffer
2595  * @ppos: file position
2596  *
2597  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2598  * values from/to the user buffer, treated as an ASCII string. Negative
2599  * strings are not allowed.
2600  *
2601  * This routine will ensure the values are within the range specified by
2602  * table->extra1 (min) and table->extra2 (max). There is a final sanity
2603  * check for UINT_MAX to avoid having to support wrap around uses from
2604  * userspace.
2605  *
2606  * Returns 0 on success.
2607  */
2608 int proc_douintvec_minmax(struct ctl_table *table, int write,
2609                           void __user *buffer, size_t *lenp, loff_t *ppos)
2610 {
2611         struct do_proc_douintvec_minmax_conv_param param = {
2612                 .min = (unsigned int *) table->extra1,
2613                 .max = (unsigned int *) table->extra2,
2614         };
2615         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2616                                  do_proc_douintvec_minmax_conv, &param);
2617 }
2618
2619 static void validate_coredump_safety(void)
2620 {
2621 #ifdef CONFIG_COREDUMP
2622         if (suid_dumpable == SUID_DUMP_ROOT &&
2623             core_pattern[0] != '/' && core_pattern[0] != '|') {
2624                 printk(KERN_WARNING
2625 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2626 "Pipe handler or fully qualified core dump path required.\n"
2627 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2628                 );
2629         }
2630 #endif
2631 }
2632
2633 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2634                 void __user *buffer, size_t *lenp, loff_t *ppos)
2635 {
2636         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2637         if (!error)
2638                 validate_coredump_safety();
2639         return error;
2640 }
2641
2642 #ifdef CONFIG_COREDUMP
2643 static int proc_dostring_coredump(struct ctl_table *table, int write,
2644                   void __user *buffer, size_t *lenp, loff_t *ppos)
2645 {
2646         int error = proc_dostring(table, write, buffer, lenp, ppos);
2647         if (!error)
2648                 validate_coredump_safety();
2649         return error;
2650 }
2651 #endif
2652
2653 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2654                                      void __user *buffer,
2655                                      size_t *lenp, loff_t *ppos,
2656                                      unsigned long convmul,
2657                                      unsigned long convdiv)
2658 {
2659         unsigned long *i, *min, *max;
2660         int vleft, first = 1, err = 0;
2661         size_t left;
2662         char *kbuf = NULL, *p;
2663
2664         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2665                 *lenp = 0;
2666                 return 0;
2667         }
2668
2669         i = (unsigned long *) data;
2670         min = (unsigned long *) table->extra1;
2671         max = (unsigned long *) table->extra2;
2672         vleft = table->maxlen / sizeof(unsigned long);
2673         left = *lenp;
2674
2675         if (write) {
2676                 if (proc_first_pos_non_zero_ignore(ppos, table))
2677                         goto out;
2678
2679                 if (left > PAGE_SIZE - 1)
2680                         left = PAGE_SIZE - 1;
2681                 p = kbuf = memdup_user_nul(buffer, left);
2682                 if (IS_ERR(kbuf))
2683                         return PTR_ERR(kbuf);
2684         }
2685
2686         for (; left && vleft--; i++, first = 0) {
2687                 unsigned long val;
2688
2689                 if (write) {
2690                         bool neg;
2691
2692                         left -= proc_skip_spaces(&p);
2693
2694                         err = proc_get_long(&p, &left, &val, &neg,
2695                                              proc_wspace_sep,
2696                                              sizeof(proc_wspace_sep), NULL);
2697                         if (err)
2698                                 break;
2699                         if (neg)
2700                                 continue;
2701                         val = convmul * val / convdiv;
2702                         if ((min && val < *min) || (max && val > *max))
2703                                 continue;
2704                         *i = val;
2705                 } else {
2706                         val = convdiv * (*i) / convmul;
2707                         if (!first) {
2708                                 err = proc_put_char(&buffer, &left, '\t');
2709                                 if (err)
2710                                         break;
2711                         }
2712                         err = proc_put_long(&buffer, &left, val, false);
2713                         if (err)
2714                                 break;
2715                 }
2716         }
2717
2718         if (!write && !first && left && !err)
2719                 err = proc_put_char(&buffer, &left, '\n');
2720         if (write && !err)
2721                 left -= proc_skip_spaces(&p);
2722         if (write) {
2723                 kfree(kbuf);
2724                 if (first)
2725                         return err ? : -EINVAL;
2726         }
2727         *lenp -= left;
2728 out:
2729         *ppos += *lenp;
2730         return err;
2731 }
2732
2733 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2734                                      void __user *buffer,
2735                                      size_t *lenp, loff_t *ppos,
2736                                      unsigned long convmul,
2737                                      unsigned long convdiv)
2738 {
2739         return __do_proc_doulongvec_minmax(table->data, table, write,
2740                         buffer, lenp, ppos, convmul, convdiv);
2741 }
2742
2743 /**
2744  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2745  * @table: the sysctl table
2746  * @write: %TRUE if this is a write to the sysctl file
2747  * @buffer: the user buffer
2748  * @lenp: the size of the user buffer
2749  * @ppos: file position
2750  *
2751  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2752  * values from/to the user buffer, treated as an ASCII string.
2753  *
2754  * This routine will ensure the values are within the range specified by
2755  * table->extra1 (min) and table->extra2 (max).
2756  *
2757  * Returns 0 on success.
2758  */
2759 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2760                            void __user *buffer, size_t *lenp, loff_t *ppos)
2761 {
2762     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2763 }
2764
2765 /**
2766  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2767  * @table: the sysctl table
2768  * @write: %TRUE if this is a write to the sysctl file
2769  * @buffer: the user buffer
2770  * @lenp: the size of the user buffer
2771  * @ppos: file position
2772  *
2773  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2774  * values from/to the user buffer, treated as an ASCII string. The values
2775  * are treated as milliseconds, and converted to jiffies when they are stored.
2776  *
2777  * This routine will ensure the values are within the range specified by
2778  * table->extra1 (min) and table->extra2 (max).
2779  *
2780  * Returns 0 on success.
2781  */
2782 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2783                                       void __user *buffer,
2784                                       size_t *lenp, loff_t *ppos)
2785 {
2786     return do_proc_doulongvec_minmax(table, write, buffer,
2787                                      lenp, ppos, HZ, 1000l);
2788 }
2789
2790
2791 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2792                                          int *valp,
2793                                          int write, void *data)
2794 {
2795         if (write) {
2796                 if (*lvalp > INT_MAX / HZ)
2797                         return 1;
2798                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2799         } else {
2800                 int val = *valp;
2801                 unsigned long lval;
2802                 if (val < 0) {
2803                         *negp = true;
2804                         lval = -(unsigned long)val;
2805                 } else {
2806                         *negp = false;
2807                         lval = (unsigned long)val;
2808                 }
2809                 *lvalp = lval / HZ;
2810         }
2811         return 0;
2812 }
2813
2814 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2815                                                 int *valp,
2816                                                 int write, void *data)
2817 {
2818         if (write) {
2819                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2820                         return 1;
2821                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2822         } else {
2823                 int val = *valp;
2824                 unsigned long lval;
2825                 if (val < 0) {
2826                         *negp = true;
2827                         lval = -(unsigned long)val;
2828                 } else {
2829                         *negp = false;
2830                         lval = (unsigned long)val;
2831                 }
2832                 *lvalp = jiffies_to_clock_t(lval);
2833         }
2834         return 0;
2835 }
2836
2837 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2838                                             int *valp,
2839                                             int write, void *data)
2840 {
2841         if (write) {
2842                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2843
2844                 if (jif > INT_MAX)
2845                         return 1;
2846                 *valp = (int)jif;
2847         } else {
2848                 int val = *valp;
2849                 unsigned long lval;
2850                 if (val < 0) {
2851                         *negp = true;
2852                         lval = -(unsigned long)val;
2853                 } else {
2854                         *negp = false;
2855                         lval = (unsigned long)val;
2856                 }
2857                 *lvalp = jiffies_to_msecs(lval);
2858         }
2859         return 0;
2860 }
2861
2862 /**
2863  * proc_dointvec_jiffies - read a vector of integers as seconds
2864  * @table: the sysctl table
2865  * @write: %TRUE if this is a write to the sysctl file
2866  * @buffer: the user buffer
2867  * @lenp: the size of the user buffer
2868  * @ppos: file position
2869  *
2870  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2871  * values from/to the user buffer, treated as an ASCII string.
2872  * The values read are assumed to be in seconds, and are converted into
2873  * jiffies.
2874  *
2875  * Returns 0 on success.
2876  */
2877 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2878                           void __user *buffer, size_t *lenp, loff_t *ppos)
2879 {
2880     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2881                             do_proc_dointvec_jiffies_conv,NULL);
2882 }
2883
2884 /**
2885  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2886  * @table: the sysctl table
2887  * @write: %TRUE if this is a write to the sysctl file
2888  * @buffer: the user buffer
2889  * @lenp: the size of the user buffer
2890  * @ppos: pointer to the file position
2891  *
2892  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2893  * values from/to the user buffer, treated as an ASCII string.
2894  * The values read are assumed to be in 1/USER_HZ seconds, and
2895  * are converted into jiffies.
2896  *
2897  * Returns 0 on success.
2898  */
2899 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2900                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2901 {
2902     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2903                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2904 }
2905
2906 /**
2907  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2908  * @table: the sysctl table
2909  * @write: %TRUE if this is a write to the sysctl file
2910  * @buffer: the user buffer
2911  * @lenp: the size of the user buffer
2912  * @ppos: file position
2913  * @ppos: the current position in the file
2914  *
2915  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2916  * values from/to the user buffer, treated as an ASCII string.
2917  * The values read are assumed to be in 1/1000 seconds, and
2918  * are converted into jiffies.
2919  *
2920  * Returns 0 on success.
2921  */
2922 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2923                              void __user *buffer, size_t *lenp, loff_t *ppos)
2924 {
2925         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2926                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2927 }
2928
2929 static int proc_do_cad_pid(struct ctl_table *table, int write,
2930                            void __user *buffer, size_t *lenp, loff_t *ppos)
2931 {
2932         struct pid *new_pid;
2933         pid_t tmp;
2934         int r;
2935
2936         tmp = pid_vnr(cad_pid);
2937
2938         r = __do_proc_dointvec(&tmp, table, write, buffer,
2939                                lenp, ppos, NULL, NULL);
2940         if (r || !write)
2941                 return r;
2942
2943         new_pid = find_get_pid(tmp);
2944         if (!new_pid)
2945                 return -ESRCH;
2946
2947         put_pid(xchg(&cad_pid, new_pid));
2948         return 0;
2949 }
2950
2951 /**
2952  * proc_do_large_bitmap - read/write from/to a large bitmap
2953  * @table: the sysctl table
2954  * @write: %TRUE if this is a write to the sysctl file
2955  * @buffer: the user buffer
2956  * @lenp: the size of the user buffer
2957  * @ppos: file position
2958  *
2959  * The bitmap is stored at table->data and the bitmap length (in bits)
2960  * in table->maxlen.
2961  *
2962  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2963  * large bitmaps may be represented in a compact manner. Writing into
2964  * the file will clear the bitmap then update it with the given input.
2965  *
2966  * Returns 0 on success.
2967  */
2968 int proc_do_large_bitmap(struct ctl_table *table, int write,
2969                          void __user *buffer, size_t *lenp, loff_t *ppos)
2970 {
2971         int err = 0;
2972         bool first = 1;
2973         size_t left = *lenp;
2974         unsigned long bitmap_len = table->maxlen;
2975         unsigned long *bitmap = *(unsigned long **) table->data;
2976         unsigned long *tmp_bitmap = NULL;
2977         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2978
2979         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2980                 *lenp = 0;
2981                 return 0;
2982         }
2983
2984         if (write) {
2985                 char *kbuf, *p;
2986
2987                 if (left > PAGE_SIZE - 1)
2988                         left = PAGE_SIZE - 1;
2989
2990                 p = kbuf = memdup_user_nul(buffer, left);
2991                 if (IS_ERR(kbuf))
2992                         return PTR_ERR(kbuf);
2993
2994                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2995                                      GFP_KERNEL);
2996                 if (!tmp_bitmap) {
2997                         kfree(kbuf);
2998                         return -ENOMEM;
2999                 }
3000                 proc_skip_char(&p, &left, '\n');
3001                 while (!err && left) {
3002                         unsigned long val_a, val_b;
3003                         bool neg;
3004
3005                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3006                                              sizeof(tr_a), &c);
3007                         if (err)
3008                                 break;
3009                         if (val_a >= bitmap_len || neg) {
3010                                 err = -EINVAL;
3011                                 break;
3012                         }
3013
3014                         val_b = val_a;
3015                         if (left) {
3016                                 p++;
3017                                 left--;
3018                         }
3019
3020                         if (c == '-') {
3021                                 err = proc_get_long(&p, &left, &val_b,
3022                                                      &neg, tr_b, sizeof(tr_b),
3023                                                      &c);
3024                                 if (err)
3025                                         break;
3026                                 if (val_b >= bitmap_len || neg ||
3027                                     val_a > val_b) {
3028                                         err = -EINVAL;
3029                                         break;
3030                                 }
3031                                 if (left) {
3032                                         p++;
3033                                         left--;
3034                                 }
3035                         }
3036
3037                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3038                         first = 0;
3039                         proc_skip_char(&p, &left, '\n');
3040                 }
3041                 kfree(kbuf);
3042         } else {
3043                 unsigned long bit_a, bit_b = 0;
3044
3045                 while (left) {
3046                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3047                         if (bit_a >= bitmap_len)
3048                                 break;
3049                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
3050                                                    bit_a + 1) - 1;
3051
3052                         if (!first) {
3053                                 err = proc_put_char(&buffer, &left, ',');
3054                                 if (err)
3055                                         break;
3056                         }
3057                         err = proc_put_long(&buffer, &left, bit_a, false);
3058                         if (err)
3059                                 break;
3060                         if (bit_a != bit_b) {
3061                                 err = proc_put_char(&buffer, &left, '-');
3062                                 if (err)
3063                                         break;
3064                                 err = proc_put_long(&buffer, &left, bit_b, false);
3065                                 if (err)
3066                                         break;
3067                         }
3068
3069                         first = 0; bit_b++;
3070                 }
3071                 if (!err)
3072                         err = proc_put_char(&buffer, &left, '\n');
3073         }
3074
3075         if (!err) {
3076                 if (write) {
3077                         if (*ppos)
3078                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3079                         else
3080                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3081                 }
3082                 kfree(tmp_bitmap);
3083                 *lenp -= left;
3084                 *ppos += *lenp;
3085                 return 0;
3086         } else {
3087                 kfree(tmp_bitmap);
3088                 return err;
3089         }
3090 }
3091
3092 #else /* CONFIG_PROC_SYSCTL */
3093
3094 int proc_dostring(struct ctl_table *table, int write,
3095                   void __user *buffer, size_t *lenp, loff_t *ppos)
3096 {
3097         return -ENOSYS;
3098 }
3099
3100 int proc_dointvec(struct ctl_table *table, int write,
3101                   void __user *buffer, size_t *lenp, loff_t *ppos)
3102 {
3103         return -ENOSYS;
3104 }
3105
3106 int proc_douintvec(struct ctl_table *table, int write,
3107                   void __user *buffer, size_t *lenp, loff_t *ppos)
3108 {
3109         return -ENOSYS;
3110 }
3111
3112 int proc_dointvec_minmax(struct ctl_table *table, int write,
3113                     void __user *buffer, size_t *lenp, loff_t *ppos)
3114 {
3115         return -ENOSYS;
3116 }
3117
3118 int proc_douintvec_minmax(struct ctl_table *table, int write,
3119                           void __user *buffer, size_t *lenp, loff_t *ppos)
3120 {
3121         return -ENOSYS;
3122 }
3123
3124 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3125                     void __user *buffer, size_t *lenp, loff_t *ppos)
3126 {
3127         return -ENOSYS;
3128 }
3129
3130 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3131                     void __user *buffer, size_t *lenp, loff_t *ppos)
3132 {
3133         return -ENOSYS;
3134 }
3135
3136 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3137                              void __user *buffer, size_t *lenp, loff_t *ppos)
3138 {
3139         return -ENOSYS;
3140 }
3141
3142 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3143                     void __user *buffer, size_t *lenp, loff_t *ppos)
3144 {
3145         return -ENOSYS;
3146 }
3147
3148 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3149                                       void __user *buffer,
3150                                       size_t *lenp, loff_t *ppos)
3151 {
3152     return -ENOSYS;
3153 }
3154
3155
3156 #endif /* CONFIG_PROC_SYSCTL */
3157
3158 /*
3159  * No sense putting this after each symbol definition, twice,
3160  * exception granted :-)
3161  */
3162 EXPORT_SYMBOL(proc_dointvec);
3163 EXPORT_SYMBOL(proc_douintvec);
3164 EXPORT_SYMBOL(proc_dointvec_jiffies);
3165 EXPORT_SYMBOL(proc_dointvec_minmax);
3166 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3167 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3168 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3169 EXPORT_SYMBOL(proc_dostring);
3170 EXPORT_SYMBOL(proc_doulongvec_minmax);
3171 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);