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/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/bitmap.h>
  27 #include <linux/signal.h>
  28 #include <linux/printk.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/security.h>
  31 #include <linux/ctype.h>
  32 #include <linux/kmemcheck.h>
  33 #include <linux/fs.h>
  34 #include <linux/init.h>
  35 #include <linux/kernel.h>
  36 #include <linux/kobject.h>
  37 #include <linux/net.h>
  38 #include <linux/sysrq.h>
  39 #include <linux/highuid.h>
  40 #include <linux/writeback.h>
  41 #include <linux/ratelimit.h>
  42 #include <linux/compaction.h>
  43 #include <linux/hugetlb.h>
  44 #include <linux/initrd.h>
  45 #include <linux/key.h>
  46 #include <linux/times.h>
  47 #include <linux/limits.h>
  48 #include <linux/dcache.h>
  49 #include <linux/dnotify.h>
  50 #include <linux/syscalls.h>
  51 #include <linux/vmstat.h>
  52 #include <linux/nfs_fs.h>
  53 #include <linux/acpi.h>
  54 #include <linux/reboot.h>
  55 #include <linux/ftrace.h>
  56 #include <linux/perf_event.h>
  57 #include <linux/kprobes.h>
  58 #include <linux/pipe_fs_i.h>
  59 #include <linux/oom.h>
  60 #include <linux/kmod.h>
  61 #include <linux/capability.h>
  62 #include <linux/binfmts.h>
  63
  64 #include <asm/uaccess.h>
  65 #include <asm/processor.h>
  66
  67 #ifdef CONFIG_X86
  68 #include <asm/nmi.h>
  69 #include <asm/stacktrace.h>
  70 #include <asm/io.h>
  71 #endif
  72 #ifdef CONFIG_SPARC
  73 #include <asm/setup.h>
  74 #endif
  75 #ifdef CONFIG_BSD_PROCESS_ACCT
  76 #include <linux/acct.h>
  77 #endif
  78 #ifdef CONFIG_RT_MUTEXES
  79 #include <linux/rtmutex.h>
  80 #endif
  81 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  82 #include <linux/lockdep.h>
  83 #endif
  84 #ifdef CONFIG_CHR_DEV_SG
  85 #include <scsi/sg.h>
  86 #endif
  87
  88 #ifdef CONFIG_LOCKUP_DETECTOR
  89 #include <linux/nmi.h>
  90 #endif
  91
  92
  93 #if defined(CONFIG_SYSCTL)
  94
  95 /* External variables not in a header file. */
  96 extern int sysctl_overcommit_memory;
  97 extern int sysctl_overcommit_ratio;
  98 extern int max_threads;
  99 extern int core_uses_pid;
 100 extern int suid_dumpable;
 101 extern char core_pattern[];
 102 extern unsigned int core_pipe_limit;
 103 extern int pid_max;
 104 extern int min_free_kbytes;
 105 extern int min_free_order_shift;
 106 extern int pid_max_min, pid_max_max;
 107 extern int sysctl_drop_caches;
 108 extern int percpu_pagelist_fraction;
 109 extern int compat_log;
 110 extern int latencytop_enabled;
 111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 112 #ifndef CONFIG_MMU
 113 extern int sysctl_nr_trim_pages;
 114 #endif
 115 #ifdef CONFIG_BLOCK
 116 extern int blk_iopoll_enabled;
 117 #endif
 118
 119 /* Constants used for minimum and  maximum */
 120 #ifdef CONFIG_LOCKUP_DETECTOR
 121 static int sixty = 60;
 122 static int neg_one = -1;
 123 #endif
 124
 125 static int zero;
 126 static int __maybe_unused one = 1;
 127 static int __maybe_unused two = 2;
 128 static int __maybe_unused three = 3;
 129 static unsigned long one_ul = 1;
 130 static int one_hundred = 100;
 131 #ifdef CONFIG_PRINTK
 132 static int ten_thousand = 10000;
 133 #endif
 134
 135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 136 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 137
 138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 139 static int maxolduid = 65535;
 140 static int minolduid;
 141 static int min_percpu_pagelist_fract = 8;
 142
 143 static int ngroups_max = NGROUPS_MAX;
 144 static const int cap_last_cap = CAP_LAST_CAP;
 145
 146 #ifdef CONFIG_INOTIFY_USER
 147 #include <linux/inotify.h>
 148 #endif
 149 #ifdef CONFIG_SPARC
 150 #endif
 151
 152 #ifdef CONFIG_SPARC64
 153 extern int sysctl_tsb_ratio;
 154 #endif
 155
 156 #ifdef __hppa__
 157 extern int pwrsw_enabled;
 158 extern int unaligned_enabled;
 159 #endif
 160
 161 #ifdef CONFIG_IA64
 162 extern int no_unaligned_warning;
 163 extern int unaligned_dump_stack;
 164 #endif
 165
 166 #ifdef CONFIG_PROC_SYSCTL
 167 static int proc_do_cad_pid(struct ctl_table *table, int write,
 168                   void __user *buffer, size_t *lenp, loff_t *ppos);
 169 static int proc_taint(struct ctl_table *table, int write,
 170                                void __user *buffer, size_t *lenp, loff_t *ppos);
 171 #endif
 172
 173 #ifdef CONFIG_PRINTK
 174 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 175                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 176 #endif
 177
 178 #ifdef CONFIG_MAGIC_SYSRQ
 179 /* Note: sysrq code uses it's own private copy */
 180 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
 181
 182 static int sysrq_sysctl_handler(ctl_table *table, int write,
 183                                 void __user *buffer, size_t *lenp,
 184                                 loff_t *ppos)
 185 {
 186         int error;
 187
 188         error = proc_dointvec(table, write, buffer, lenp, ppos);
 189         if (error)
 190                 return error;
 191
 192         if (write)
 193                 sysrq_toggle_support(__sysrq_enabled);
 194
 195         return 0;
 196 }
 197
 198 #endif
 199
 200 static struct ctl_table kern_table[];
 201 static struct ctl_table vm_table[];
 202 static struct ctl_table fs_table[];
 203 static struct ctl_table debug_table[];
 204 static struct ctl_table dev_table[];
 205 extern struct ctl_table random_table[];
 206 #ifdef CONFIG_EPOLL
 207 extern struct ctl_table epoll_table[];
 208 #endif
 209
 210 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 211 int sysctl_legacy_va_layout;
 212 #endif
 213
 214 /* The default sysctl tables: */
 215
 216 static struct ctl_table sysctl_base_table[] = {
 217         {
 218                 .procname       = "kernel",
 219                 .mode           = 0555,
 220                 .child          = kern_table,
 221         },
 222         {
 223                 .procname       = "vm",
 224                 .mode           = 0555,
 225                 .child          = vm_table,
 226         },
 227         {
 228                 .procname       = "fs",
 229                 .mode           = 0555,
 230                 .child          = fs_table,
 231         },
 232         {
 233                 .procname       = "debug",
 234                 .mode           = 0555,
 235                 .child          = debug_table,
 236         },
 237         {
 238                 .procname       = "dev",
 239                 .mode           = 0555,
 240                 .child          = dev_table,
 241         },
 242         { }
 243 };
 244
 245 #ifdef CONFIG_SCHED_DEBUG
 246 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 247 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 248 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 249 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 250 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 251 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 252 #endif
 253
 254 #ifdef CONFIG_COMPACTION
 255 static int min_extfrag_threshold;
 256 static int max_extfrag_threshold = 1000;
 257 #endif
 258
 259 static struct ctl_table kern_table[] = {
 260         {
 261                 .procname       = "sched_child_runs_first",
 262                 .data           = &sysctl_sched_child_runs_first,
 263                 .maxlen         = sizeof(unsigned int),
 264                 .mode           = 0644,
 265                 .proc_handler   = proc_dointvec,
 266         },
 267 #ifdef CONFIG_SCHED_DEBUG
 268         {
 269                 .procname       = "sched_min_granularity_ns",
 270                 .data           = &sysctl_sched_min_granularity,
 271                 .maxlen         = sizeof(unsigned int),
 272                 .mode           = 0644,
 273                 .proc_handler   = sched_proc_update_handler,
 274                 .extra1         = &min_sched_granularity_ns,
 275                 .extra2         = &max_sched_granularity_ns,
 276         },
 277         {
 278                 .procname       = "sched_latency_ns",
 279                 .data           = &sysctl_sched_latency,
 280                 .maxlen         = sizeof(unsigned int),
 281                 .mode           = 0644,
 282                 .proc_handler   = sched_proc_update_handler,
 283                 .extra1         = &min_sched_granularity_ns,
 284                 .extra2         = &max_sched_granularity_ns,
 285         },
 286         {
 287                 .procname       = "sched_wakeup_granularity_ns",
 288                 .data           = &sysctl_sched_wakeup_granularity,
 289                 .maxlen         = sizeof(unsigned int),
 290                 .mode           = 0644,
 291                 .proc_handler   = sched_proc_update_handler,
 292                 .extra1         = &min_wakeup_granularity_ns,
 293                 .extra2         = &max_wakeup_granularity_ns,
 294         },
 295         {
 296                 .procname       = "sched_tunable_scaling",
 297                 .data           = &sysctl_sched_tunable_scaling,
 298                 .maxlen         = sizeof(enum sched_tunable_scaling),
 299                 .mode           = 0644,
 300                 .proc_handler   = sched_proc_update_handler,
 301                 .extra1         = &min_sched_tunable_scaling,
 302                 .extra2         = &max_sched_tunable_scaling,
 303         },
 304         {
 305                 .procname       = "sched_migration_cost",
 306                 .data           = &sysctl_sched_migration_cost,
 307                 .maxlen         = sizeof(unsigned int),
 308                 .mode           = 0644,
 309                 .proc_handler   = proc_dointvec,
 310         },
 311         {
 312                 .procname       = "sched_nr_migrate",
 313                 .data           = &sysctl_sched_nr_migrate,
 314                 .maxlen         = sizeof(unsigned int),
 315                 .mode           = 0644,
 316                 .proc_handler   = proc_dointvec,
 317         },
 318         {
 319                 .procname       = "sched_time_avg",
 320                 .data           = &sysctl_sched_time_avg,
 321                 .maxlen         = sizeof(unsigned int),
 322                 .mode           = 0644,
 323                 .proc_handler   = proc_dointvec,
 324         },
 325         {
 326                 .procname       = "sched_shares_window",
 327                 .data           = &sysctl_sched_shares_window,
 328                 .maxlen         = sizeof(unsigned int),
 329                 .mode           = 0644,
 330                 .proc_handler   = proc_dointvec,
 331         },
 332         {
 333                 .procname       = "timer_migration",
 334                 .data           = &sysctl_timer_migration,
 335                 .maxlen         = sizeof(unsigned int),
 336                 .mode           = 0644,
 337                 .proc_handler   = proc_dointvec_minmax,
 338                 .extra1         = &zero,
 339                 .extra2         = &one,
 340         },
 341 #endif
 342         {
 343                 .procname       = "sched_rt_period_us",
 344                 .data           = &sysctl_sched_rt_period,
 345                 .maxlen         = sizeof(unsigned int),
 346                 .mode           = 0644,
 347                 .proc_handler   = sched_rt_handler,
 348         },
 349         {
 350                 .procname       = "sched_rt_runtime_us",
 351                 .data           = &sysctl_sched_rt_runtime,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = sched_rt_handler,
 355         },
 356 #ifdef CONFIG_SCHED_AUTOGROUP
 357         {
 358                 .procname       = "sched_autogroup_enabled",
 359                 .data           = &sysctl_sched_autogroup_enabled,
 360                 .maxlen         = sizeof(unsigned int),
 361                 .mode           = 0644,
 362                 .proc_handler   = proc_dointvec_minmax,
 363                 .extra1         = &zero,
 364                 .extra2         = &one,
 365         },
 366 #endif
 367 #ifdef CONFIG_CFS_BANDWIDTH
 368         {
 369                 .procname       = "sched_cfs_bandwidth_slice_us",
 370                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 371                 .maxlen         = sizeof(unsigned int),
 372                 .mode           = 0644,
 373                 .proc_handler   = proc_dointvec_minmax,
 374                 .extra1         = &one,
 375         },
 376 #endif
 377 #ifdef CONFIG_PROVE_LOCKING
 378         {
 379                 .procname       = "prove_locking",
 380                 .data           = &prove_locking,
 381                 .maxlen         = sizeof(int),
 382                 .mode           = 0644,
 383                 .proc_handler   = proc_dointvec,
 384         },
 385 #endif
 386 #ifdef CONFIG_LOCK_STAT
 387         {
 388                 .procname       = "lock_stat",
 389                 .data           = &lock_stat,
 390                 .maxlen         = sizeof(int),
 391                 .mode           = 0644,
 392                 .proc_handler   = proc_dointvec,
 393         },
 394 #endif
 395         {
 396                 .procname       = "panic",
 397                 .data           = &panic_timeout,
 398                 .maxlen         = sizeof(int),
 399                 .mode           = 0644,
 400                 .proc_handler   = proc_dointvec,
 401         },
 402         {
 403                 .procname       = "core_uses_pid",
 404                 .data           = &core_uses_pid,
 405                 .maxlen         = sizeof(int),
 406                 .mode           = 0644,
 407                 .proc_handler   = proc_dointvec,
 408         },
 409         {
 410                 .procname       = "core_pattern",
 411                 .data           = core_pattern,
 412                 .maxlen         = CORENAME_MAX_SIZE,
 413                 .mode           = 0644,
 414                 .proc_handler   = proc_dostring,
 415         },
 416         {
 417                 .procname       = "core_pipe_limit",
 418                 .data           = &core_pipe_limit,
 419                 .maxlen         = sizeof(unsigned int),
 420                 .mode           = 0644,
 421                 .proc_handler   = proc_dointvec,
 422         },
 423 #ifdef CONFIG_PROC_SYSCTL
 424         {
 425                 .procname       = "tainted",
 426                 .maxlen         = sizeof(long),
 427                 .mode           = 0644,
 428                 .proc_handler   = proc_taint,
 429         },
 430 #endif
 431 #ifdef CONFIG_LATENCYTOP
 432         {
 433                 .procname       = "latencytop",
 434                 .data           = &latencytop_enabled,
 435                 .maxlen         = sizeof(int),
 436                 .mode           = 0644,
 437                 .proc_handler   = proc_dointvec,
 438         },
 439 #endif
 440 #ifdef CONFIG_BLK_DEV_INITRD
 441         {
 442                 .procname       = "real-root-dev",
 443                 .data           = &real_root_dev,
 444                 .maxlen         = sizeof(int),
 445                 .mode           = 0644,
 446                 .proc_handler   = proc_dointvec,
 447         },
 448 #endif
 449         {
 450                 .procname       = "print-fatal-signals",
 451                 .data           = &print_fatal_signals,
 452                 .maxlen         = sizeof(int),
 453                 .mode           = 0644,
 454                 .proc_handler   = proc_dointvec,
 455         },
 456 #ifdef CONFIG_SPARC
 457         {
 458                 .procname       = "reboot-cmd",
 459                 .data           = reboot_command,
 460                 .maxlen         = 256,
 461                 .mode           = 0644,
 462                 .proc_handler   = proc_dostring,
 463         },
 464         {
 465                 .procname       = "stop-a",
 466                 .data           = &stop_a_enabled,
 467                 .maxlen         = sizeof (int),
 468                 .mode           = 0644,
 469                 .proc_handler   = proc_dointvec,
 470         },
 471         {
 472                 .procname       = "scons-poweroff",
 473                 .data           = &scons_pwroff,
 474                 .maxlen         = sizeof (int),
 475                 .mode           = 0644,
 476                 .proc_handler   = proc_dointvec,
 477         },
 478 #endif
 479 #ifdef CONFIG_SPARC64
 480         {
 481                 .procname       = "tsb-ratio",
 482                 .data           = &sysctl_tsb_ratio,
 483                 .maxlen         = sizeof (int),
 484                 .mode           = 0644,
 485                 .proc_handler   = proc_dointvec,
 486         },
 487 #endif
 488 #ifdef __hppa__
 489         {
 490                 .procname       = "soft-power",
 491                 .data           = &pwrsw_enabled,
 492                 .maxlen         = sizeof (int),
 493                 .mode           = 0644,
 494                 .proc_handler   = proc_dointvec,
 495         },
 496         {
 497                 .procname       = "unaligned-trap",
 498                 .data           = &unaligned_enabled,
 499                 .maxlen         = sizeof (int),
 500                 .mode           = 0644,
 501                 .proc_handler   = proc_dointvec,
 502         },
 503 #endif
 504         {
 505                 .procname       = "ctrl-alt-del",
 506                 .data           = &C_A_D,
 507                 .maxlen         = sizeof(int),
 508                 .mode           = 0644,
 509                 .proc_handler   = proc_dointvec,
 510         },
 511 #ifdef CONFIG_FUNCTION_TRACER
 512         {
 513                 .procname       = "ftrace_enabled",
 514                 .data           = &ftrace_enabled,
 515                 .maxlen         = sizeof(int),
 516                 .mode           = 0644,
 517                 .proc_handler   = ftrace_enable_sysctl,
 518         },
 519 #endif
 520 #ifdef CONFIG_STACK_TRACER
 521         {
 522                 .procname       = "stack_tracer_enabled",
 523                 .data           = &stack_tracer_enabled,
 524                 .maxlen         = sizeof(int),
 525                 .mode           = 0644,
 526                 .proc_handler   = stack_trace_sysctl,
 527         },
 528 #endif
 529 #ifdef CONFIG_TRACING
 530         {
 531                 .procname       = "ftrace_dump_on_oops",
 532                 .data           = &ftrace_dump_on_oops,
 533                 .maxlen         = sizeof(int),
 534                 .mode           = 0644,
 535                 .proc_handler   = proc_dointvec,
 536         },
 537 #endif
 538 #ifdef CONFIG_MODULES
 539         {
 540                 .procname       = "modprobe",
 541                 .data           = &modprobe_path,
 542                 .maxlen         = KMOD_PATH_LEN,
 543                 .mode           = 0644,
 544                 .proc_handler   = proc_dostring,
 545         },
 546         {
 547                 .procname       = "modules_disabled",
 548                 .data           = &modules_disabled,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 /* only handle a transition from default "0" to "1" */
 552                 .proc_handler   = proc_dointvec_minmax,
 553                 .extra1         = &one,
 554                 .extra2         = &one,
 555         },
 556 #endif
 557 #ifdef CONFIG_HOTPLUG
 558         {
 559                 .procname       = "hotplug",
 560                 .data           = &uevent_helper,
 561                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 562                 .mode           = 0644,
 563                 .proc_handler   = proc_dostring,
 564         },
 565 #endif
 566 #ifdef CONFIG_CHR_DEV_SG
 567         {
 568                 .procname       = "sg-big-buff",
 569                 .data           = &sg_big_buff,
 570                 .maxlen         = sizeof (int),
 571                 .mode           = 0444,
 572                 .proc_handler   = proc_dointvec,
 573         },
 574 #endif
 575 #ifdef CONFIG_BSD_PROCESS_ACCT
 576         {
 577                 .procname       = "acct",
 578                 .data           = &acct_parm,
 579                 .maxlen         = 3*sizeof(int),
 580                 .mode           = 0644,
 581                 .proc_handler   = proc_dointvec,
 582         },
 583 #endif
 584 #ifdef CONFIG_MAGIC_SYSRQ
 585         {
 586                 .procname       = "sysrq",
 587                 .data           = &__sysrq_enabled,
 588                 .maxlen         = sizeof (int),
 589                 .mode           = 0644,
 590                 .proc_handler   = sysrq_sysctl_handler,
 591         },
 592 #endif
 593 #ifdef CONFIG_PROC_SYSCTL
 594         {
 595                 .procname       = "cad_pid",
 596                 .data           = NULL,
 597                 .maxlen         = sizeof (int),
 598                 .mode           = 0600,
 599                 .proc_handler   = proc_do_cad_pid,
 600         },
 601 #endif
 602         {
 603                 .procname       = "threads-max",
 604                 .data           = &max_threads,
 605                 .maxlen         = sizeof(int),
 606                 .mode           = 0644,
 607                 .proc_handler   = proc_dointvec,
 608         },
 609         {
 610                 .procname       = "random",
 611                 .mode           = 0555,
 612                 .child          = random_table,
 613         },
 614         {
 615                 .procname       = "usermodehelper",
 616                 .mode           = 0555,
 617                 .child          = usermodehelper_table,
 618         },
 619         {
 620                 .procname       = "overflowuid",
 621                 .data           = &overflowuid,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = proc_dointvec_minmax,
 625                 .extra1         = &minolduid,
 626                 .extra2         = &maxolduid,
 627         },
 628         {
 629                 .procname       = "overflowgid",
 630                 .data           = &overflowgid,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = proc_dointvec_minmax,
 634                 .extra1         = &minolduid,
 635                 .extra2         = &maxolduid,
 636         },
 637 #ifdef CONFIG_S390
 638 #ifdef CONFIG_MATHEMU
 639         {
 640                 .procname       = "ieee_emulation_warnings",
 641                 .data           = &sysctl_ieee_emulation_warnings,
 642                 .maxlen         = sizeof(int),
 643                 .mode           = 0644,
 644                 .proc_handler   = proc_dointvec,
 645         },
 646 #endif
 647         {
 648                 .procname       = "userprocess_debug",
 649                 .data           = &show_unhandled_signals,
 650                 .maxlen         = sizeof(int),
 651                 .mode           = 0644,
 652                 .proc_handler   = proc_dointvec,
 653         },
 654 #endif
 655         {
 656                 .procname       = "pid_max",
 657                 .data           = &pid_max,
 658                 .maxlen         = sizeof (int),
 659                 .mode           = 0644,
 660                 .proc_handler   = proc_dointvec_minmax,
 661                 .extra1         = &pid_max_min,
 662                 .extra2         = &pid_max_max,
 663         },
 664         {
 665                 .procname       = "panic_on_oops",
 666                 .data           = &panic_on_oops,
 667                 .maxlen         = sizeof(int),
 668                 .mode           = 0644,
 669                 .proc_handler   = proc_dointvec,
 670         },
 671 #if defined CONFIG_PRINTK
 672         {
 673                 .procname       = "printk",
 674                 .data           = &console_loglevel,
 675                 .maxlen         = 4*sizeof(int),
 676                 .mode           = 0644,
 677                 .proc_handler   = proc_dointvec,
 678         },
 679         {
 680                 .procname       = "printk_ratelimit",
 681                 .data           = &printk_ratelimit_state.interval,
 682                 .maxlen         = sizeof(int),
 683                 .mode           = 0644,
 684                 .proc_handler   = proc_dointvec_jiffies,
 685         },
 686         {
 687                 .procname       = "printk_ratelimit_burst",
 688                 .data           = &printk_ratelimit_state.burst,
 689                 .maxlen         = sizeof(int),
 690                 .mode           = 0644,
 691                 .proc_handler   = proc_dointvec,
 692         },
 693         {
 694                 .procname       = "printk_delay",
 695                 .data           = &printk_delay_msec,
 696                 .maxlen         = sizeof(int),
 697                 .mode           = 0644,
 698                 .proc_handler   = proc_dointvec_minmax,
 699                 .extra1         = &zero,
 700                 .extra2         = &ten_thousand,
 701         },
 702         {
 703                 .procname       = "dmesg_restrict",
 704                 .data           = &dmesg_restrict,
 705                 .maxlen         = sizeof(int),
 706                 .mode           = 0644,
 707                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 708                 .extra1         = &zero,
 709                 .extra2         = &one,
 710         },
 711         {
 712                 .procname       = "kptr_restrict",
 713                 .data           = &kptr_restrict,
 714                 .maxlen         = sizeof(int),
 715                 .mode           = 0644,
 716                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 717                 .extra1         = &zero,
 718                 .extra2         = &two,
 719         },
 720 #endif
 721         {
 722                 .procname       = "ngroups_max",
 723                 .data           = &ngroups_max,
 724                 .maxlen         = sizeof (int),
 725                 .mode           = 0444,
 726                 .proc_handler   = proc_dointvec,
 727         },
 728         {
 729                 .procname       = "cap_last_cap",
 730                 .data           = (void *)&cap_last_cap,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0444,
 733                 .proc_handler   = proc_dointvec,
 734         },
 735 #if defined(CONFIG_LOCKUP_DETECTOR)
 736         {
 737                 .procname       = "watchdog",
 738                 .data           = &watchdog_enabled,
 739                 .maxlen         = sizeof (int),
 740                 .mode           = 0644,
 741                 .proc_handler   = proc_dowatchdog,
 742                 .extra1         = &zero,
 743                 .extra2         = &one,
 744         },
 745         {
 746                 .procname       = "watchdog_thresh",
 747                 .data           = &watchdog_thresh,
 748                 .maxlen         = sizeof(int),
 749                 .mode           = 0644,
 750                 .proc_handler   = proc_dowatchdog,
 751                 .extra1         = &neg_one,
 752                 .extra2         = &sixty,
 753         },
 754         {
 755                 .procname       = "softlockup_panic",
 756                 .data           = &softlockup_panic,
 757                 .maxlen         = sizeof(int),
 758                 .mode           = 0644,
 759                 .proc_handler   = proc_dointvec_minmax,
 760                 .extra1         = &zero,
 761                 .extra2         = &one,
 762         },
 763         {
 764                 .procname       = "nmi_watchdog",
 765                 .data           = &watchdog_enabled,
 766                 .maxlen         = sizeof (int),
 767                 .mode           = 0644,
 768                 .proc_handler   = proc_dowatchdog,
 769                 .extra1         = &zero,
 770                 .extra2         = &one,
 771         },
 772 #endif
 773 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 774         {
 775                 .procname       = "unknown_nmi_panic",
 776                 .data           = &unknown_nmi_panic,
 777                 .maxlen         = sizeof (int),
 778                 .mode           = 0644,
 779                 .proc_handler   = proc_dointvec,
 780         },
 781 #endif
 782 #if defined(CONFIG_X86)
 783         {
 784                 .procname       = "panic_on_unrecovered_nmi",
 785                 .data           = &panic_on_unrecovered_nmi,
 786                 .maxlen         = sizeof(int),
 787                 .mode           = 0644,
 788                 .proc_handler   = proc_dointvec,
 789         },
 790         {
 791                 .procname       = "panic_on_io_nmi",
 792                 .data           = &panic_on_io_nmi,
 793                 .maxlen         = sizeof(int),
 794                 .mode           = 0644,
 795                 .proc_handler   = proc_dointvec,
 796         },
 797 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 798         {
 799                 .procname       = "panic_on_stackoverflow",
 800                 .data           = &sysctl_panic_on_stackoverflow,
 801                 .maxlen         = sizeof(int),
 802                 .mode           = 0644,
 803                 .proc_handler   = proc_dointvec,
 804         },
 805 #endif
 806         {
 807                 .procname       = "bootloader_type",
 808                 .data           = &bootloader_type,
 809                 .maxlen         = sizeof (int),
 810                 .mode           = 0444,
 811                 .proc_handler   = proc_dointvec,
 812         },
 813         {
 814                 .procname       = "bootloader_version",
 815                 .data           = &bootloader_version,
 816                 .maxlen         = sizeof (int),
 817                 .mode           = 0444,
 818                 .proc_handler   = proc_dointvec,
 819         },
 820         {
 821                 .procname       = "kstack_depth_to_print",
 822                 .data           = &kstack_depth_to_print,
 823                 .maxlen         = sizeof(int),
 824                 .mode           = 0644,
 825                 .proc_handler   = proc_dointvec,
 826         },
 827         {
 828                 .procname       = "io_delay_type",
 829                 .data           = &io_delay_type,
 830                 .maxlen         = sizeof(int),
 831                 .mode           = 0644,
 832                 .proc_handler   = proc_dointvec,
 833         },
 834 #endif
 835 #if defined(CONFIG_MMU)
 836         {
 837                 .procname       = "randomize_va_space",
 838                 .data           = &randomize_va_space,
 839                 .maxlen         = sizeof(int),
 840                 .mode           = 0644,
 841                 .proc_handler   = proc_dointvec,
 842         },
 843 #endif
 844 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 845         {
 846                 .procname       = "spin_retry",
 847                 .data           = &spin_retry,
 848                 .maxlen         = sizeof (int),
 849                 .mode           = 0644,
 850                 .proc_handler   = proc_dointvec,
 851         },
 852 #endif
 853 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 854         {
 855                 .procname       = "acpi_video_flags",
 856                 .data           = &acpi_realmode_flags,
 857                 .maxlen         = sizeof (unsigned long),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_doulongvec_minmax,
 860         },
 861 #endif
 862 #ifdef CONFIG_IA64
 863         {
 864                 .procname       = "ignore-unaligned-usertrap",
 865                 .data           = &no_unaligned_warning,
 866                 .maxlen         = sizeof (int),
 867                 .mode           = 0644,
 868                 .proc_handler   = proc_dointvec,
 869         },
 870         {
 871                 .procname       = "unaligned-dump-stack",
 872                 .data           = &unaligned_dump_stack,
 873                 .maxlen         = sizeof (int),
 874                 .mode           = 0644,
 875                 .proc_handler   = proc_dointvec,
 876         },
 877 #endif
 878 #ifdef CONFIG_DETECT_HUNG_TASK
 879         {
 880                 .procname       = "hung_task_panic",
 881                 .data           = &sysctl_hung_task_panic,
 882                 .maxlen         = sizeof(int),
 883                 .mode           = 0644,
 884                 .proc_handler   = proc_dointvec_minmax,
 885                 .extra1         = &zero,
 886                 .extra2         = &one,
 887         },
 888         {
 889                 .procname       = "hung_task_check_count",
 890                 .data           = &sysctl_hung_task_check_count,
 891                 .maxlen         = sizeof(unsigned long),
 892                 .mode           = 0644,
 893                 .proc_handler   = proc_doulongvec_minmax,
 894         },
 895         {
 896                 .procname       = "hung_task_timeout_secs",
 897                 .data           = &sysctl_hung_task_timeout_secs,
 898                 .maxlen         = sizeof(unsigned long),
 899                 .mode           = 0644,
 900                 .proc_handler   = proc_dohung_task_timeout_secs,
 901         },
 902         {
 903                 .procname       = "hung_task_warnings",
 904                 .data           = &sysctl_hung_task_warnings,
 905                 .maxlen         = sizeof(unsigned long),
 906                 .mode           = 0644,
 907                 .proc_handler   = proc_doulongvec_minmax,
 908         },
 909 #endif
 910 #ifdef CONFIG_COMPAT
 911         {
 912                 .procname       = "compat-log",
 913                 .data           = &compat_log,
 914                 .maxlen         = sizeof (int),
 915                 .mode           = 0644,
 916                 .proc_handler   = proc_dointvec,
 917         },
 918 #endif
 919 #ifdef CONFIG_RT_MUTEXES
 920         {
 921                 .procname       = "max_lock_depth",
 922                 .data           = &max_lock_depth,
 923                 .maxlen         = sizeof(int),
 924                 .mode           = 0644,
 925                 .proc_handler   = proc_dointvec,
 926         },
 927 #endif
 928         {
 929                 .procname       = "poweroff_cmd",
 930                 .data           = &poweroff_cmd,
 931                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 932                 .mode           = 0644,
 933                 .proc_handler   = proc_dostring,
 934         },
 935 #ifdef CONFIG_KEYS
 936         {
 937                 .procname       = "keys",
 938                 .mode           = 0555,
 939                 .child          = key_sysctls,
 940         },
 941 #endif
 942 #ifdef CONFIG_RCU_TORTURE_TEST
 943         {
 944                 .procname       = "rcutorture_runnable",
 945                 .data           = &rcutorture_runnable,
 946                 .maxlen         = sizeof(int),
 947                 .mode           = 0644,
 948                 .proc_handler   = proc_dointvec,
 949         },
 950 #endif
 951 #ifdef CONFIG_PERF_EVENTS
 952         /*
 953          * User-space scripts rely on the existence of this file
 954          * as a feature check for perf_events being enabled.
 955          *
 956          * So it's an ABI, do not remove!
 957          */
 958         {
 959                 .procname       = "perf_event_paranoid",
 960                 .data           = &sysctl_perf_event_paranoid,
 961                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
 962                 .mode           = 0644,
 963                 .proc_handler   = proc_dointvec,
 964         },
 965         {
 966                 .procname       = "perf_event_mlock_kb",
 967                 .data           = &sysctl_perf_event_mlock,
 968                 .maxlen         = sizeof(sysctl_perf_event_mlock),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_dointvec,
 971         },
 972         {
 973                 .procname       = "perf_event_max_sample_rate",
 974                 .data           = &sysctl_perf_event_sample_rate,
 975                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
 976                 .mode           = 0644,
 977                 .proc_handler   = perf_proc_update_handler,
 978         },
 979 #endif
 980 #ifdef CONFIG_KMEMCHECK
 981         {
 982                 .procname       = "kmemcheck",
 983                 .data           = &kmemcheck_enabled,
 984                 .maxlen         = sizeof(int),
 985                 .mode           = 0644,
 986                 .proc_handler   = proc_dointvec,
 987         },
 988 #endif
 989 #ifdef CONFIG_BLOCK
 990         {
 991                 .procname       = "blk_iopoll",
 992                 .data           = &blk_iopoll_enabled,
 993                 .maxlen         = sizeof(int),
 994                 .mode           = 0644,
 995                 .proc_handler   = proc_dointvec,
 996         },
 997 #endif
 998         { }
 999 };
1000
1001 static struct ctl_table vm_table[] = {
1002         {
1003                 .procname       = "overcommit_memory",
1004                 .data           = &sysctl_overcommit_memory,
1005                 .maxlen         = sizeof(sysctl_overcommit_memory),
1006                 .mode           = 0644,
1007                 .proc_handler   = proc_dointvec_minmax,
1008                 .extra1         = &zero,
1009                 .extra2         = &two,
1010         },
1011         {
1012                 .procname       = "panic_on_oom",
1013                 .data           = &sysctl_panic_on_oom,
1014                 .maxlen         = sizeof(sysctl_panic_on_oom),
1015                 .mode           = 0644,
1016                 .proc_handler   = proc_dointvec_minmax,
1017                 .extra1         = &zero,
1018                 .extra2         = &two,
1019         },
1020         {
1021                 .procname       = "oom_kill_allocating_task",
1022                 .data           = &sysctl_oom_kill_allocating_task,
1023                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1024                 .mode           = 0644,
1025                 .proc_handler   = proc_dointvec,
1026         },
1027         {
1028                 .procname       = "oom_dump_tasks",
1029                 .data           = &sysctl_oom_dump_tasks,
1030                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1031                 .mode           = 0644,
1032                 .proc_handler   = proc_dointvec,
1033         },
1034         {
1035                 .procname       = "overcommit_ratio",
1036                 .data           = &sysctl_overcommit_ratio,
1037                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1038                 .mode           = 0644,
1039                 .proc_handler   = proc_dointvec,
1040         },
1041         {
1042                 .procname       = "page-cluster",
1043                 .data           = &page_cluster,
1044                 .maxlen         = sizeof(int),
1045                 .mode           = 0644,
1046                 .proc_handler   = proc_dointvec_minmax,
1047                 .extra1         = &zero,
1048         },
1049         {
1050                 .procname       = "dirty_background_ratio",
1051                 .data           = &dirty_background_ratio,
1052                 .maxlen         = sizeof(dirty_background_ratio),
1053                 .mode           = 0644,
1054                 .proc_handler   = dirty_background_ratio_handler,
1055                 .extra1         = &zero,
1056                 .extra2         = &one_hundred,
1057         },
1058         {
1059                 .procname       = "dirty_background_bytes",
1060                 .data           = &dirty_background_bytes,
1061                 .maxlen         = sizeof(dirty_background_bytes),
1062                 .mode           = 0644,
1063                 .proc_handler   = dirty_background_bytes_handler,
1064                 .extra1         = &one_ul,
1065         },
1066         {
1067                 .procname       = "dirty_ratio",
1068                 .data           = &vm_dirty_ratio,
1069                 .maxlen         = sizeof(vm_dirty_ratio),
1070                 .mode           = 0644,
1071                 .proc_handler   = dirty_ratio_handler,
1072                 .extra1         = &zero,
1073                 .extra2         = &one_hundred,
1074         },
1075         {
1076                 .procname       = "dirty_bytes",
1077                 .data           = &vm_dirty_bytes,
1078                 .maxlen         = sizeof(vm_dirty_bytes),
1079                 .mode           = 0644,
1080                 .proc_handler   = dirty_bytes_handler,
1081                 .extra1         = &dirty_bytes_min,
1082         },
1083         {
1084                 .procname       = "dirty_writeback_centisecs",
1085                 .data           = &dirty_writeback_interval,
1086                 .maxlen         = sizeof(dirty_writeback_interval),
1087                 .mode           = 0644,
1088                 .proc_handler   = dirty_writeback_centisecs_handler,
1089         },
1090         {
1091                 .procname       = "dirty_expire_centisecs",
1092                 .data           = &dirty_expire_interval,
1093                 .maxlen         = sizeof(dirty_expire_interval),
1094                 .mode           = 0644,
1095                 .proc_handler   = proc_dointvec_minmax,
1096                 .extra1         = &zero,
1097         },
1098         {
1099                 .procname       = "nr_pdflush_threads",
1100                 .data           = &nr_pdflush_threads,
1101                 .maxlen         = sizeof nr_pdflush_threads,
1102                 .mode           = 0444 /* read-only*/,
1103                 .proc_handler   = proc_dointvec,
1104         },
1105         {
1106                 .procname       = "swappiness",
1107                 .data           = &vm_swappiness,
1108                 .maxlen         = sizeof(vm_swappiness),
1109                 .mode           = 0644,
1110                 .proc_handler   = proc_dointvec_minmax,
1111                 .extra1         = &zero,
1112                 .extra2         = &one_hundred,
1113         },
1114 #ifdef CONFIG_HUGETLB_PAGE
1115         {
1116                 .procname       = "nr_hugepages",
1117                 .data           = NULL,
1118                 .maxlen         = sizeof(unsigned long),
1119                 .mode           = 0644,
1120                 .proc_handler   = hugetlb_sysctl_handler,
1121                 .extra1         = (void *)&hugetlb_zero,
1122                 .extra2         = (void *)&hugetlb_infinity,
1123         },
1124 #ifdef CONFIG_NUMA
1125         {
1126                 .procname       = "nr_hugepages_mempolicy",
1127                 .data           = NULL,
1128                 .maxlen         = sizeof(unsigned long),
1129                 .mode           = 0644,
1130                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1131                 .extra1         = (void *)&hugetlb_zero,
1132                 .extra2         = (void *)&hugetlb_infinity,
1133         },
1134 #endif
1135          {
1136                 .procname       = "hugetlb_shm_group",
1137                 .data           = &sysctl_hugetlb_shm_group,
1138                 .maxlen         = sizeof(gid_t),
1139                 .mode           = 0644,
1140                 .proc_handler   = proc_dointvec,
1141          },
1142          {
1143                 .procname       = "hugepages_treat_as_movable",
1144                 .data           = &hugepages_treat_as_movable,
1145                 .maxlen         = sizeof(int),
1146                 .mode           = 0644,
1147                 .proc_handler   = hugetlb_treat_movable_handler,
1148         },
1149         {
1150                 .procname       = "nr_overcommit_hugepages",
1151                 .data           = NULL,
1152                 .maxlen         = sizeof(unsigned long),
1153                 .mode           = 0644,
1154                 .proc_handler   = hugetlb_overcommit_handler,
1155                 .extra1         = (void *)&hugetlb_zero,
1156                 .extra2         = (void *)&hugetlb_infinity,
1157         },
1158 #endif
1159         {
1160                 .procname       = "lowmem_reserve_ratio",
1161                 .data           = &sysctl_lowmem_reserve_ratio,
1162                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1163                 .mode           = 0644,
1164                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1165         },
1166         {
1167                 .procname       = "drop_caches",
1168                 .data           = &sysctl_drop_caches,
1169                 .maxlen         = sizeof(int),
1170                 .mode           = 0644,
1171                 .proc_handler   = drop_caches_sysctl_handler,
1172                 .extra1         = &one,
1173                 .extra2         = &three,
1174         },
1175 #ifdef CONFIG_COMPACTION
1176         {
1177                 .procname       = "compact_memory",
1178                 .data           = &sysctl_compact_memory,
1179                 .maxlen         = sizeof(int),
1180                 .mode           = 0200,
1181                 .proc_handler   = sysctl_compaction_handler,
1182         },
1183         {
1184                 .procname       = "extfrag_threshold",
1185                 .data           = &sysctl_extfrag_threshold,
1186                 .maxlen         = sizeof(int),
1187                 .mode           = 0644,
1188                 .proc_handler   = sysctl_extfrag_handler,
1189                 .extra1         = &min_extfrag_threshold,
1190                 .extra2         = &max_extfrag_threshold,
1191         },
1192
1193 #endif /* CONFIG_COMPACTION */
1194         {
1195                 .procname       = "min_free_kbytes",
1196                 .data           = &min_free_kbytes,
1197                 .maxlen         = sizeof(min_free_kbytes),
1198                 .mode           = 0644,
1199                 .proc_handler   = min_free_kbytes_sysctl_handler,
1200                 .extra1         = &zero,
1201         },
1202         {
1203                 .procname       = "min_free_order_shift",
1204                 .data           = &min_free_order_shift,
1205                 .maxlen         = sizeof(min_free_order_shift),
1206                 .mode           = 0644,
1207                 .proc_handler   = &proc_dointvec
1208         },
1209         {
1210                 .procname       = "percpu_pagelist_fraction",
1211                 .data           = &percpu_pagelist_fraction,
1212                 .maxlen         = sizeof(percpu_pagelist_fraction),
1213                 .mode           = 0644,
1214                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1215                 .extra1         = &min_percpu_pagelist_fract,
1216         },
1217 #ifdef CONFIG_MMU
1218         {
1219                 .procname       = "max_map_count",
1220                 .data           = &sysctl_max_map_count,
1221                 .maxlen         = sizeof(sysctl_max_map_count),
1222                 .mode           = 0644,
1223                 .proc_handler   = proc_dointvec_minmax,
1224                 .extra1         = &zero,
1225         },
1226 #else
1227         {
1228                 .procname       = "nr_trim_pages",
1229                 .data           = &sysctl_nr_trim_pages,
1230                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1231                 .mode           = 0644,
1232                 .proc_handler   = proc_dointvec_minmax,
1233                 .extra1         = &zero,
1234         },
1235 #endif
1236         {
1237                 .procname       = "laptop_mode",
1238                 .data           = &laptop_mode,
1239                 .maxlen         = sizeof(laptop_mode),
1240                 .mode           = 0644,
1241                 .proc_handler   = proc_dointvec_jiffies,
1242         },
1243         {
1244                 .procname       = "block_dump",
1245                 .data           = &block_dump,
1246                 .maxlen         = sizeof(block_dump),
1247                 .mode           = 0644,
1248                 .proc_handler   = proc_dointvec,
1249                 .extra1         = &zero,
1250         },
1251         {
1252                 .procname       = "vfs_cache_pressure",
1253                 .data           = &sysctl_vfs_cache_pressure,
1254                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1255                 .mode           = 0644,
1256                 .proc_handler   = proc_dointvec,
1257                 .extra1         = &zero,
1258         },
1259 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1260         {
1261                 .procname       = "legacy_va_layout",
1262                 .data           = &sysctl_legacy_va_layout,
1263                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1264                 .mode           = 0644,
1265                 .proc_handler   = proc_dointvec,
1266                 .extra1         = &zero,
1267         },
1268 #endif
1269 #ifdef CONFIG_NUMA
1270         {
1271                 .procname       = "zone_reclaim_mode",
1272                 .data           = &zone_reclaim_mode,
1273                 .maxlen         = sizeof(zone_reclaim_mode),
1274                 .mode           = 0644,
1275                 .proc_handler   = proc_dointvec,
1276                 .extra1         = &zero,
1277         },
1278         {
1279                 .procname       = "min_unmapped_ratio",
1280                 .data           = &sysctl_min_unmapped_ratio,
1281                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1282                 .mode           = 0644,
1283                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1284                 .extra1         = &zero,
1285                 .extra2         = &one_hundred,
1286         },
1287         {
1288                 .procname       = "min_slab_ratio",
1289                 .data           = &sysctl_min_slab_ratio,
1290                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1291                 .mode           = 0644,
1292                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1293                 .extra1         = &zero,
1294                 .extra2         = &one_hundred,
1295         },
1296 #endif
1297 #ifdef CONFIG_SMP
1298         {
1299                 .procname       = "stat_interval",
1300                 .data           = &sysctl_stat_interval,
1301                 .maxlen         = sizeof(sysctl_stat_interval),
1302                 .mode           = 0644,
1303                 .proc_handler   = proc_dointvec_jiffies,
1304         },
1305 #endif
1306 #ifdef CONFIG_MMU
1307         {
1308                 .procname       = "mmap_min_addr",
1309                 .data           = &dac_mmap_min_addr,
1310                 .maxlen         = sizeof(unsigned long),
1311                 .mode           = 0644,
1312                 .proc_handler   = mmap_min_addr_handler,
1313         },
1314 #endif
1315 #ifdef CONFIG_NUMA
1316         {
1317                 .procname       = "numa_zonelist_order",
1318                 .data           = &numa_zonelist_order,
1319                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1320                 .mode           = 0644,
1321                 .proc_handler   = numa_zonelist_order_handler,
1322         },
1323 #endif
1324 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1325    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1326         {
1327                 .procname       = "vdso_enabled",
1328                 .data           = &vdso_enabled,
1329                 .maxlen         = sizeof(vdso_enabled),
1330                 .mode           = 0644,
1331                 .proc_handler   = proc_dointvec,
1332                 .extra1         = &zero,
1333         },
1334 #endif
1335 #ifdef CONFIG_HIGHMEM
1336         {
1337                 .procname       = "highmem_is_dirtyable",
1338                 .data           = &vm_highmem_is_dirtyable,
1339                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1340                 .mode           = 0644,
1341                 .proc_handler   = proc_dointvec_minmax,
1342                 .extra1         = &zero,
1343                 .extra2         = &one,
1344         },
1345 #endif
1346         {
1347                 .procname       = "scan_unevictable_pages",
1348                 .data           = &scan_unevictable_pages,
1349                 .maxlen         = sizeof(scan_unevictable_pages),
1350                 .mode           = 0644,
1351                 .proc_handler   = scan_unevictable_handler,
1352         },
1353 #ifdef CONFIG_MEMORY_FAILURE
1354         {
1355                 .procname       = "memory_failure_early_kill",
1356                 .data           = &sysctl_memory_failure_early_kill,
1357                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1358                 .mode           = 0644,
1359                 .proc_handler   = proc_dointvec_minmax,
1360                 .extra1         = &zero,
1361                 .extra2         = &one,
1362         },
1363         {
1364                 .procname       = "memory_failure_recovery",
1365                 .data           = &sysctl_memory_failure_recovery,
1366                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1367                 .mode           = 0644,
1368                 .proc_handler   = proc_dointvec_minmax,
1369                 .extra1         = &zero,
1370                 .extra2         = &one,
1371         },
1372 #endif
1373         { }
1374 };
1375
1376 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1377 static struct ctl_table binfmt_misc_table[] = {
1378         { }
1379 };
1380 #endif
1381
1382 static struct ctl_table fs_table[] = {
1383         {
1384                 .procname       = "inode-nr",
1385                 .data           = &inodes_stat,
1386                 .maxlen         = 2*sizeof(int),
1387                 .mode           = 0444,
1388                 .proc_handler   = proc_nr_inodes,
1389         },
1390         {
1391                 .procname       = "inode-state",
1392                 .data           = &inodes_stat,
1393                 .maxlen         = 7*sizeof(int),
1394                 .mode           = 0444,
1395                 .proc_handler   = proc_nr_inodes,
1396         },
1397         {
1398                 .procname       = "file-nr",
1399                 .data           = &files_stat,
1400                 .maxlen         = sizeof(files_stat),
1401                 .mode           = 0444,
1402                 .proc_handler   = proc_nr_files,
1403         },
1404         {
1405                 .procname       = "file-max",
1406                 .data           = &files_stat.max_files,
1407                 .maxlen         = sizeof(files_stat.max_files),
1408                 .mode           = 0644,
1409                 .proc_handler   = proc_doulongvec_minmax,
1410         },
1411         {
1412                 .procname       = "nr_open",
1413                 .data           = &sysctl_nr_open,
1414                 .maxlen         = sizeof(int),
1415                 .mode           = 0644,
1416                 .proc_handler   = proc_dointvec_minmax,
1417                 .extra1         = &sysctl_nr_open_min,
1418                 .extra2         = &sysctl_nr_open_max,
1419         },
1420         {
1421                 .procname       = "dentry-state",
1422                 .data           = &dentry_stat,
1423                 .maxlen         = 6*sizeof(int),
1424                 .mode           = 0444,
1425                 .proc_handler   = proc_nr_dentry,
1426         },
1427         {
1428                 .procname       = "overflowuid",
1429                 .data           = &fs_overflowuid,
1430                 .maxlen         = sizeof(int),
1431                 .mode           = 0644,
1432                 .proc_handler   = proc_dointvec_minmax,
1433                 .extra1         = &minolduid,
1434                 .extra2         = &maxolduid,
1435         },
1436         {
1437                 .procname       = "overflowgid",
1438                 .data           = &fs_overflowgid,
1439                 .maxlen         = sizeof(int),
1440                 .mode           = 0644,
1441                 .proc_handler   = proc_dointvec_minmax,
1442                 .extra1         = &minolduid,
1443                 .extra2         = &maxolduid,
1444         },
1445 #ifdef CONFIG_FILE_LOCKING
1446         {
1447                 .procname       = "leases-enable",
1448                 .data           = &leases_enable,
1449                 .maxlen         = sizeof(int),
1450                 .mode           = 0644,
1451                 .proc_handler   = proc_dointvec,
1452         },
1453 #endif
1454 #ifdef CONFIG_DNOTIFY
1455         {
1456                 .procname       = "dir-notify-enable",
1457                 .data           = &dir_notify_enable,
1458                 .maxlen         = sizeof(int),
1459                 .mode           = 0644,
1460                 .proc_handler   = proc_dointvec,
1461         },
1462 #endif
1463 #ifdef CONFIG_MMU
1464 #ifdef CONFIG_FILE_LOCKING
1465         {
1466                 .procname       = "lease-break-time",
1467                 .data           = &lease_break_time,
1468                 .maxlen         = sizeof(int),
1469                 .mode           = 0644,
1470                 .proc_handler   = proc_dointvec,
1471         },
1472 #endif
1473 #ifdef CONFIG_AIO
1474         {
1475                 .procname       = "aio-nr",
1476                 .data           = &aio_nr,
1477                 .maxlen         = sizeof(aio_nr),
1478                 .mode           = 0444,
1479                 .proc_handler   = proc_doulongvec_minmax,
1480         },
1481         {
1482                 .procname       = "aio-max-nr",
1483                 .data           = &aio_max_nr,
1484                 .maxlen         = sizeof(aio_max_nr),
1485                 .mode           = 0644,
1486                 .proc_handler   = proc_doulongvec_minmax,
1487         },
1488 #endif /* CONFIG_AIO */
1489 #ifdef CONFIG_INOTIFY_USER
1490         {
1491                 .procname       = "inotify",
1492                 .mode           = 0555,
1493                 .child          = inotify_table,
1494         },
1495 #endif
1496 #ifdef CONFIG_EPOLL
1497         {
1498                 .procname       = "epoll",
1499                 .mode           = 0555,
1500                 .child          = epoll_table,
1501         },
1502 #endif
1503 #endif
1504         {
1505                 .procname       = "suid_dumpable",
1506                 .data           = &suid_dumpable,
1507                 .maxlen         = sizeof(int),
1508                 .mode           = 0644,
1509                 .proc_handler   = proc_dointvec_minmax,
1510                 .extra1         = &zero,
1511                 .extra2         = &two,
1512         },
1513 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1514         {
1515                 .procname       = "binfmt_misc",
1516                 .mode           = 0555,
1517                 .child          = binfmt_misc_table,
1518         },
1519 #endif
1520         {
1521                 .procname       = "pipe-max-size",
1522                 .data           = &pipe_max_size,
1523                 .maxlen         = sizeof(int),
1524                 .mode           = 0644,
1525                 .proc_handler   = &pipe_proc_fn,
1526                 .extra1         = &pipe_min_size,
1527         },
1528         { }
1529 };
1530
1531 static struct ctl_table debug_table[] = {
1532 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1533     defined(CONFIG_S390) || defined(CONFIG_TILE)
1534         {
1535                 .procname       = "exception-trace",
1536                 .data           = &show_unhandled_signals,
1537                 .maxlen         = sizeof(int),
1538                 .mode           = 0644,
1539                 .proc_handler   = proc_dointvec
1540         },
1541 #endif
1542 #if defined(CONFIG_OPTPROBES)
1543         {
1544                 .procname       = "kprobes-optimization",
1545                 .data           = &sysctl_kprobes_optimization,
1546                 .maxlen         = sizeof(int),
1547                 .mode           = 0644,
1548                 .proc_handler   = proc_kprobes_optimization_handler,
1549                 .extra1         = &zero,
1550                 .extra2         = &one,
1551         },
1552 #endif
1553         { }
1554 };
1555
1556 static struct ctl_table dev_table[] = {
1557         { }
1558 };
1559
1560 int __init sysctl_init(void)
1561 {
1562         register_sysctl_table(sysctl_base_table);
1563         return 0;
1564 }
1565
1566 #endif /* CONFIG_SYSCTL */
1567
1568 /*
1569  * /proc/sys support
1570  */
1571
1572 #ifdef CONFIG_PROC_SYSCTL
1573
1574 static int _proc_do_string(void* data, int maxlen, int write,
1575                            void __user *buffer,
1576                            size_t *lenp, loff_t *ppos)
1577 {
1578         size_t len;
1579         char __user *p;
1580         char c;
1581
1582         if (!data || !maxlen || !*lenp) {
1583                 *lenp = 0;
1584                 return 0;
1585         }
1586
1587         if (write) {
1588                 len = 0;
1589                 p = buffer;
1590                 while (len < *lenp) {
1591                         if (get_user(c, p++))
1592                                 return -EFAULT;
1593                         if (c == 0 || c == '\n')
1594                                 break;
1595                         len++;
1596                 }
1597                 if (len >= maxlen)
1598                         len = maxlen-1;
1599                 if(copy_from_user(data, buffer, len))
1600                         return -EFAULT;
1601                 ((char *) data)[len] = 0;
1602                 *ppos += *lenp;
1603         } else {
1604                 len = strlen(data);
1605                 if (len > maxlen)
1606                         len = maxlen;
1607
1608                 if (*ppos > len) {
1609                         *lenp = 0;
1610                         return 0;
1611                 }
1612
1613                 data += *ppos;
1614                 len  -= *ppos;
1615
1616                 if (len > *lenp)
1617                         len = *lenp;
1618                 if (len)
1619                         if(copy_to_user(buffer, data, len))
1620                                 return -EFAULT;
1621                 if (len < *lenp) {
1622                         if(put_user('\n', ((char __user *) buffer) + len))
1623                                 return -EFAULT;
1624                         len++;
1625                 }
1626                 *lenp = len;
1627                 *ppos += len;
1628         }
1629         return 0;
1630 }
1631
1632 /**
1633  * proc_dostring - read a string sysctl
1634  * @table: the sysctl table
1635  * @write: %TRUE if this is a write to the sysctl file
1636  * @buffer: the user buffer
1637  * @lenp: the size of the user buffer
1638  * @ppos: file position
1639  *
1640  * Reads/writes a string from/to the user buffer. If the kernel
1641  * buffer provided is not large enough to hold the string, the
1642  * string is truncated. The copied string is %NULL-terminated.
1643  * If the string is being read by the user process, it is copied
1644  * and a newline '\n' is added. It is truncated if the buffer is
1645  * not large enough.
1646  *
1647  * Returns 0 on success.
1648  */
1649 int proc_dostring(struct ctl_table *table, int write,
1650                   void __user *buffer, size_t *lenp, loff_t *ppos)
1651 {
1652         return _proc_do_string(table->data, table->maxlen, write,
1653                                buffer, lenp, ppos);
1654 }
1655
1656 static size_t proc_skip_spaces(char **buf)
1657 {
1658         size_t ret;
1659         char *tmp = skip_spaces(*buf);
1660         ret = tmp - *buf;
1661         *buf = tmp;
1662         return ret;
1663 }
1664
1665 static void proc_skip_char(char **buf, size_t *size, const char v)
1666 {
1667         while (*size) {
1668                 if (**buf != v)
1669                         break;
1670                 (*size)--;
1671                 (*buf)++;
1672         }
1673 }
1674
1675 #define TMPBUFLEN 22
1676 /**
1677  * proc_get_long - reads an ASCII formatted integer from a user buffer
1678  *
1679  * @buf: a kernel buffer
1680  * @size: size of the kernel buffer
1681  * @val: this is where the number will be stored
1682  * @neg: set to %TRUE if number is negative
1683  * @perm_tr: a vector which contains the allowed trailers
1684  * @perm_tr_len: size of the perm_tr vector
1685  * @tr: pointer to store the trailer character
1686  *
1687  * In case of success %0 is returned and @buf and @size are updated with
1688  * the amount of bytes read. If @tr is non-NULL and a trailing
1689  * character exists (size is non-zero after returning from this
1690  * function), @tr is updated with the trailing character.
1691  */
1692 static int proc_get_long(char **buf, size_t *size,
1693                           unsigned long *val, bool *neg,
1694                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1695 {
1696         int len;
1697         char *p, tmp[TMPBUFLEN];
1698
1699         if (!*size)
1700                 return -EINVAL;
1701
1702         len = *size;
1703         if (len > TMPBUFLEN - 1)
1704                 len = TMPBUFLEN - 1;
1705
1706         memcpy(tmp, *buf, len);
1707
1708         tmp[len] = 0;
1709         p = tmp;
1710         if (*p == '-' && *size > 1) {
1711                 *neg = true;
1712                 p++;
1713         } else
1714                 *neg = false;
1715         if (!isdigit(*p))
1716                 return -EINVAL;
1717
1718         *val = simple_strtoul(p, &p, 0);
1719
1720         len = p - tmp;
1721
1722         /* We don't know if the next char is whitespace thus we may accept
1723          * invalid integers (e.g. 1234...a) or two integers instead of one
1724          * (e.g. 123...1). So lets not allow such large numbers. */
1725         if (len == TMPBUFLEN - 1)
1726                 return -EINVAL;
1727
1728         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1729                 return -EINVAL;
1730
1731         if (tr && (len < *size))
1732                 *tr = *p;
1733
1734         *buf += len;
1735         *size -= len;
1736
1737         return 0;
1738 }
1739
1740 /**
1741  * proc_put_long - converts an integer to a decimal ASCII formatted string
1742  *
1743  * @buf: the user buffer
1744  * @size: the size of the user buffer
1745  * @val: the integer to be converted
1746  * @neg: sign of the number, %TRUE for negative
1747  *
1748  * In case of success %0 is returned and @buf and @size are updated with
1749  * the amount of bytes written.
1750  */
1751 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1752                           bool neg)
1753 {
1754         int len;
1755         char tmp[TMPBUFLEN], *p = tmp;
1756
1757         sprintf(p, "%s%lu", neg ? "-" : "", val);
1758         len = strlen(tmp);
1759         if (len > *size)
1760                 len = *size;
1761         if (copy_to_user(*buf, tmp, len))
1762                 return -EFAULT;
1763         *size -= len;
1764         *buf += len;
1765         return 0;
1766 }
1767 #undef TMPBUFLEN
1768
1769 static int proc_put_char(void __user **buf, size_t *size, char c)
1770 {
1771         if (*size) {
1772                 char __user **buffer = (char __user **)buf;
1773                 if (put_user(c, *buffer))
1774                         return -EFAULT;
1775                 (*size)--, (*buffer)++;
1776                 *buf = *buffer;
1777         }
1778         return 0;
1779 }
1780
1781 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1782                                  int *valp,
1783                                  int write, void *data)
1784 {
1785         if (write) {
1786                 *valp = *negp ? -*lvalp : *lvalp;
1787         } else {
1788                 int val = *valp;
1789                 if (val < 0) {
1790                         *negp = true;
1791                         *lvalp = (unsigned long)-val;
1792                 } else {
1793                         *negp = false;
1794                         *lvalp = (unsigned long)val;
1795                 }
1796         }
1797         return 0;
1798 }
1799
1800 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1801
1802 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1803                   int write, void __user *buffer,
1804                   size_t *lenp, loff_t *ppos,
1805                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1806                               int write, void *data),
1807                   void *data)
1808 {
1809         int *i, vleft, first = 1, err = 0;
1810         unsigned long page = 0;
1811         size_t left;
1812         char *kbuf;
1813
1814         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1815                 *lenp = 0;
1816                 return 0;
1817         }
1818
1819         i = (int *) tbl_data;
1820         vleft = table->maxlen / sizeof(*i);
1821         left = *lenp;
1822
1823         if (!conv)
1824                 conv = do_proc_dointvec_conv;
1825
1826         if (write) {
1827                 if (left > PAGE_SIZE - 1)
1828                         left = PAGE_SIZE - 1;
1829                 page = __get_free_page(GFP_TEMPORARY);
1830                 kbuf = (char *) page;
1831                 if (!kbuf)
1832                         return -ENOMEM;
1833                 if (copy_from_user(kbuf, buffer, left)) {
1834                         err = -EFAULT;
1835                         goto free;
1836                 }
1837                 kbuf[left] = 0;
1838         }
1839
1840         for (; left && vleft--; i++, first=0) {
1841                 unsigned long lval;
1842                 bool neg;
1843
1844                 if (write) {
1845                         left -= proc_skip_spaces(&kbuf);
1846
1847                         if (!left)
1848                                 break;
1849                         err = proc_get_long(&kbuf, &left, &lval, &neg,
1850                                              proc_wspace_sep,
1851                                              sizeof(proc_wspace_sep), NULL);
1852                         if (err)
1853                                 break;
1854                         if (conv(&neg, &lval, i, 1, data)) {
1855                                 err = -EINVAL;
1856                                 break;
1857                         }
1858                 } else {
1859                         if (conv(&neg, &lval, i, 0, data)) {
1860                                 err = -EINVAL;
1861                                 break;
1862                         }
1863                         if (!first)
1864                                 err = proc_put_char(&buffer, &left, '\t');
1865                         if (err)
1866                                 break;
1867                         err = proc_put_long(&buffer, &left, lval, neg);
1868                         if (err)
1869                                 break;
1870                 }
1871         }
1872
1873         if (!write && !first && left && !err)
1874                 err = proc_put_char(&buffer, &left, '\n');
1875         if (write && !err && left)
1876                 left -= proc_skip_spaces(&kbuf);
1877 free:
1878         if (write) {
1879                 free_page(page);
1880                 if (first)
1881                         return err ? : -EINVAL;
1882         }
1883         *lenp -= left;
1884         *ppos += *lenp;
1885         return err;
1886 }
1887
1888 static int do_proc_dointvec(struct ctl_table *table, int write,
1889                   void __user *buffer, size_t *lenp, loff_t *ppos,
1890                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1891                               int write, void *data),
1892                   void *data)
1893 {
1894         return __do_proc_dointvec(table->data, table, write,
1895                         buffer, lenp, ppos, conv, data);
1896 }
1897
1898 /**
1899  * proc_dointvec - read a vector of integers
1900  * @table: the sysctl table
1901  * @write: %TRUE if this is a write to the sysctl file
1902  * @buffer: the user buffer
1903  * @lenp: the size of the user buffer
1904  * @ppos: file position
1905  *
1906  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1907  * values from/to the user buffer, treated as an ASCII string.
1908  *
1909  * Returns 0 on success.
1910  */
1911 int proc_dointvec(struct ctl_table *table, int write,
1912                      void __user *buffer, size_t *lenp, loff_t *ppos)
1913 {
1914     return do_proc_dointvec(table,write,buffer,lenp,ppos,
1915                             NULL,NULL);
1916 }
1917
1918 /*
1919  * Taint values can only be increased
1920  * This means we can safely use a temporary.
1921  */
1922 static int proc_taint(struct ctl_table *table, int write,
1923                                void __user *buffer, size_t *lenp, loff_t *ppos)
1924 {
1925         struct ctl_table t;
1926         unsigned long tmptaint = get_taint();
1927         int err;
1928
1929         if (write && !capable(CAP_SYS_ADMIN))
1930                 return -EPERM;
1931
1932         t = *table;
1933         t.data = &tmptaint;
1934         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1935         if (err < 0)
1936                 return err;
1937
1938         if (write) {
1939                 /*
1940                  * Poor man's atomic or. Not worth adding a primitive
1941                  * to everyone's atomic.h for this
1942                  */
1943                 int i;
1944                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1945                         if ((tmptaint >> i) & 1)
1946                                 add_taint(i);
1947                 }
1948         }
1949
1950         return err;
1951 }
1952
1953 #ifdef CONFIG_PRINTK
1954 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1955                                 void __user *buffer, size_t *lenp, loff_t *ppos)
1956 {
1957         if (write && !capable(CAP_SYS_ADMIN))
1958                 return -EPERM;
1959
1960         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1961 }
1962 #endif
1963
1964 struct do_proc_dointvec_minmax_conv_param {
1965         int *min;
1966         int *max;
1967 };
1968
1969 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1970                                         int *valp,
1971                                         int write, void *data)
1972 {
1973         struct do_proc_dointvec_minmax_conv_param *param = data;
1974         if (write) {
1975                 int val = *negp ? -*lvalp : *lvalp;
1976                 if ((param->min && *param->min > val) ||
1977                     (param->max && *param->max < val))
1978                         return -EINVAL;
1979                 *valp = val;
1980         } else {
1981                 int val = *valp;
1982                 if (val < 0) {
1983                         *negp = true;
1984                         *lvalp = (unsigned long)-val;
1985                 } else {
1986                         *negp = false;
1987                         *lvalp = (unsigned long)val;
1988                 }
1989         }
1990         return 0;
1991 }
1992
1993 /**
1994  * proc_dointvec_minmax - read a vector of integers with min/max values
1995  * @table: the sysctl table
1996  * @write: %TRUE if this is a write to the sysctl file
1997  * @buffer: the user buffer
1998  * @lenp: the size of the user buffer
1999  * @ppos: file position
2000  *
2001  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2002  * values from/to the user buffer, treated as an ASCII string.
2003  *
2004  * This routine will ensure the values are within the range specified by
2005  * table->extra1 (min) and table->extra2 (max).
2006  *
2007  * Returns 0 on success.
2008  */
2009 int proc_dointvec_minmax(struct ctl_table *table, int write,
2010                   void __user *buffer, size_t *lenp, loff_t *ppos)
2011 {
2012         struct do_proc_dointvec_minmax_conv_param param = {
2013                 .min = (int *) table->extra1,
2014                 .max = (int *) table->extra2,
2015         };
2016         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2017                                 do_proc_dointvec_minmax_conv, &param);
2018 }
2019
2020 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2021                                      void __user *buffer,
2022                                      size_t *lenp, loff_t *ppos,
2023                                      unsigned long convmul,
2024                                      unsigned long convdiv)
2025 {
2026         unsigned long *i, *min, *max;
2027         int vleft, first = 1, err = 0;
2028         unsigned long page = 0;
2029         size_t left;
2030         char *kbuf;
2031
2032         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2033                 *lenp = 0;
2034                 return 0;
2035         }
2036
2037         i = (unsigned long *) data;
2038         min = (unsigned long *) table->extra1;
2039         max = (unsigned long *) table->extra2;
2040         vleft = table->maxlen / sizeof(unsigned long);
2041         left = *lenp;
2042
2043         if (write) {
2044                 if (left > PAGE_SIZE - 1)
2045                         left = PAGE_SIZE - 1;
2046                 page = __get_free_page(GFP_TEMPORARY);
2047                 kbuf = (char *) page;
2048                 if (!kbuf)
2049                         return -ENOMEM;
2050                 if (copy_from_user(kbuf, buffer, left)) {
2051                         err = -EFAULT;
2052                         goto free;
2053                 }
2054                 kbuf[left] = 0;
2055         }
2056
2057         for (; left && vleft--; i++, first = 0) {
2058                 unsigned long val;
2059
2060                 if (write) {
2061                         bool neg;
2062
2063                         left -= proc_skip_spaces(&kbuf);
2064
2065                         err = proc_get_long(&kbuf, &left, &val, &neg,
2066                                              proc_wspace_sep,
2067                                              sizeof(proc_wspace_sep), NULL);
2068                         if (err)
2069                                 break;
2070                         if (neg)
2071                                 continue;
2072                         if ((min && val < *min) || (max && val > *max))
2073                                 continue;
2074                         *i = val;
2075                 } else {
2076                         val = convdiv * (*i) / convmul;
2077                         if (!first)
2078                                 err = proc_put_char(&buffer, &left, '\t');
2079                         err = proc_put_long(&buffer, &left, val, false);
2080                         if (err)
2081                                 break;
2082                 }
2083         }
2084
2085         if (!write && !first && left && !err)
2086                 err = proc_put_char(&buffer, &left, '\n');
2087         if (write && !err)
2088                 left -= proc_skip_spaces(&kbuf);
2089 free:
2090         if (write) {
2091                 free_page(page);
2092                 if (first)
2093                         return err ? : -EINVAL;
2094         }
2095         *lenp -= left;
2096         *ppos += *lenp;
2097         return err;
2098 }
2099
2100 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2101                                      void __user *buffer,
2102                                      size_t *lenp, loff_t *ppos,
2103                                      unsigned long convmul,
2104                                      unsigned long convdiv)
2105 {
2106         return __do_proc_doulongvec_minmax(table->data, table, write,
2107                         buffer, lenp, ppos, convmul, convdiv);
2108 }
2109
2110 /**
2111  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2112  * @table: the sysctl table
2113  * @write: %TRUE if this is a write to the sysctl file
2114  * @buffer: the user buffer
2115  * @lenp: the size of the user buffer
2116  * @ppos: file position
2117  *
2118  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2119  * values from/to the user buffer, treated as an ASCII string.
2120  *
2121  * This routine will ensure the values are within the range specified by
2122  * table->extra1 (min) and table->extra2 (max).
2123  *
2124  * Returns 0 on success.
2125  */
2126 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2127                            void __user *buffer, size_t *lenp, loff_t *ppos)
2128 {
2129     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2130 }
2131
2132 /**
2133  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2134  * @table: the sysctl table
2135  * @write: %TRUE if this is a write to the sysctl file
2136  * @buffer: the user buffer
2137  * @lenp: the size of the user buffer
2138  * @ppos: file position
2139  *
2140  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2141  * values from/to the user buffer, treated as an ASCII string. The values
2142  * are treated as milliseconds, and converted to jiffies when they are stored.
2143  *
2144  * This routine will ensure the values are within the range specified by
2145  * table->extra1 (min) and table->extra2 (max).
2146  *
2147  * Returns 0 on success.
2148  */
2149 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2150                                       void __user *buffer,
2151                                       size_t *lenp, loff_t *ppos)
2152 {
2153     return do_proc_doulongvec_minmax(table, write, buffer,
2154                                      lenp, ppos, HZ, 1000l);
2155 }
2156
2157
2158 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2159                                          int *valp,
2160                                          int write, void *data)
2161 {
2162         if (write) {
2163                 if (*lvalp > LONG_MAX / HZ)
2164                         return 1;
2165                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2166         } else {
2167                 int val = *valp;
2168                 unsigned long lval;
2169                 if (val < 0) {
2170                         *negp = true;
2171                         lval = (unsigned long)-val;
2172                 } else {
2173                         *negp = false;
2174                         lval = (unsigned long)val;
2175                 }
2176                 *lvalp = lval / HZ;
2177         }
2178         return 0;
2179 }
2180
2181 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2182                                                 int *valp,
2183                                                 int write, void *data)
2184 {
2185         if (write) {
2186                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2187                         return 1;
2188                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2189         } else {
2190                 int val = *valp;
2191                 unsigned long lval;
2192                 if (val < 0) {
2193                         *negp = true;
2194                         lval = (unsigned long)-val;
2195                 } else {
2196                         *negp = false;
2197                         lval = (unsigned long)val;
2198                 }
2199                 *lvalp = jiffies_to_clock_t(lval);
2200         }
2201         return 0;
2202 }
2203
2204 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2205                                             int *valp,
2206                                             int write, void *data)
2207 {
2208         if (write) {
2209                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2210         } else {
2211                 int val = *valp;
2212                 unsigned long lval;
2213                 if (val < 0) {
2214                         *negp = true;
2215                         lval = (unsigned long)-val;
2216                 } else {
2217                         *negp = false;
2218                         lval = (unsigned long)val;
2219                 }
2220                 *lvalp = jiffies_to_msecs(lval);
2221         }
2222         return 0;
2223 }
2224
2225 /**
2226  * proc_dointvec_jiffies - read a vector of integers as seconds
2227  * @table: the sysctl table
2228  * @write: %TRUE if this is a write to the sysctl file
2229  * @buffer: the user buffer
2230  * @lenp: the size of the user buffer
2231  * @ppos: file position
2232  *
2233  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2234  * values from/to the user buffer, treated as an ASCII string.
2235  * The values read are assumed to be in seconds, and are converted into
2236  * jiffies.
2237  *
2238  * Returns 0 on success.
2239  */
2240 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2241                           void __user *buffer, size_t *lenp, loff_t *ppos)
2242 {
2243     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2244                             do_proc_dointvec_jiffies_conv,NULL);
2245 }
2246
2247 /**
2248  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2249  * @table: the sysctl table
2250  * @write: %TRUE if this is a write to the sysctl file
2251  * @buffer: the user buffer
2252  * @lenp: the size of the user buffer
2253  * @ppos: pointer to the file position
2254  *
2255  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2256  * values from/to the user buffer, treated as an ASCII string.
2257  * The values read are assumed to be in 1/USER_HZ seconds, and
2258  * are converted into jiffies.
2259  *
2260  * Returns 0 on success.
2261  */
2262 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2263                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2264 {
2265     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2266                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2267 }
2268
2269 /**
2270  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2271  * @table: the sysctl table
2272  * @write: %TRUE if this is a write to the sysctl file
2273  * @buffer: the user buffer
2274  * @lenp: the size of the user buffer
2275  * @ppos: file position
2276  * @ppos: the current position in the file
2277  *
2278  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2279  * values from/to the user buffer, treated as an ASCII string.
2280  * The values read are assumed to be in 1/1000 seconds, and
2281  * are converted into jiffies.
2282  *
2283  * Returns 0 on success.
2284  */
2285 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2286                              void __user *buffer, size_t *lenp, loff_t *ppos)
2287 {
2288         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2289                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2290 }
2291
2292 static int proc_do_cad_pid(struct ctl_table *table, int write,
2293                            void __user *buffer, size_t *lenp, loff_t *ppos)
2294 {
2295         struct pid *new_pid;
2296         pid_t tmp;
2297         int r;
2298
2299         tmp = pid_vnr(cad_pid);
2300
2301         r = __do_proc_dointvec(&tmp, table, write, buffer,
2302                                lenp, ppos, NULL, NULL);
2303         if (r || !write)
2304                 return r;
2305
2306         new_pid = find_get_pid(tmp);
2307         if (!new_pid)
2308                 return -ESRCH;
2309
2310         put_pid(xchg(&cad_pid, new_pid));
2311         return 0;
2312 }
2313
2314 /**
2315  * proc_do_large_bitmap - read/write from/to a large bitmap
2316  * @table: the sysctl table
2317  * @write: %TRUE if this is a write to the sysctl file
2318  * @buffer: the user buffer
2319  * @lenp: the size of the user buffer
2320  * @ppos: file position
2321  *
2322  * The bitmap is stored at table->data and the bitmap length (in bits)
2323  * in table->maxlen.
2324  *
2325  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2326  * large bitmaps may be represented in a compact manner. Writing into
2327  * the file will clear the bitmap then update it with the given input.
2328  *
2329  * Returns 0 on success.
2330  */
2331 int proc_do_large_bitmap(struct ctl_table *table, int write,
2332                          void __user *buffer, size_t *lenp, loff_t *ppos)
2333 {
2334         int err = 0;
2335         bool first = 1;
2336         size_t left = *lenp;
2337         unsigned long bitmap_len = table->maxlen;
2338         unsigned long *bitmap = (unsigned long *) table->data;
2339         unsigned long *tmp_bitmap = NULL;
2340         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2341
2342         if (!bitmap_len || !left || (*ppos && !write)) {
2343                 *lenp = 0;
2344                 return 0;
2345         }
2346
2347         if (write) {
2348                 unsigned long page = 0;
2349                 char *kbuf;
2350
2351                 if (left > PAGE_SIZE - 1)
2352                         left = PAGE_SIZE - 1;
2353
2354                 page = __get_free_page(GFP_TEMPORARY);
2355                 kbuf = (char *) page;
2356                 if (!kbuf)
2357                         return -ENOMEM;
2358                 if (copy_from_user(kbuf, buffer, left)) {
2359                         free_page(page);
2360                         return -EFAULT;
2361                 }
2362                 kbuf[left] = 0;
2363
2364                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2365                                      GFP_KERNEL);
2366                 if (!tmp_bitmap) {
2367                         free_page(page);
2368                         return -ENOMEM;
2369                 }
2370                 proc_skip_char(&kbuf, &left, '\n');
2371                 while (!err && left) {
2372                         unsigned long val_a, val_b;
2373                         bool neg;
2374
2375                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2376                                              sizeof(tr_a), &c);
2377                         if (err)
2378                                 break;
2379                         if (val_a >= bitmap_len || neg) {
2380                                 err = -EINVAL;
2381                                 break;
2382                         }
2383
2384                         val_b = val_a;
2385                         if (left) {
2386                                 kbuf++;
2387                                 left--;
2388                         }
2389
2390                         if (c == '-') {
2391                                 err = proc_get_long(&kbuf, &left, &val_b,
2392                                                      &neg, tr_b, sizeof(tr_b),
2393                                                      &c);
2394                                 if (err)
2395                                         break;
2396                                 if (val_b >= bitmap_len || neg ||
2397                                     val_a > val_b) {
2398                                         err = -EINVAL;
2399                                         break;
2400                                 }
2401                                 if (left) {
2402                                         kbuf++;
2403                                         left--;
2404                                 }
2405                         }
2406
2407                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2408                         first = 0;
2409                         proc_skip_char(&kbuf, &left, '\n');
2410                 }
2411                 free_page(page);
2412         } else {
2413                 unsigned long bit_a, bit_b = 0;
2414
2415                 while (left) {
2416                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2417                         if (bit_a >= bitmap_len)
2418                                 break;
2419                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2420                                                    bit_a + 1) - 1;
2421
2422                         if (!first) {
2423                                 err = proc_put_char(&buffer, &left, ',');
2424                                 if (err)
2425                                         break;
2426                         }
2427                         err = proc_put_long(&buffer, &left, bit_a, false);
2428                         if (err)
2429                                 break;
2430                         if (bit_a != bit_b) {
2431                                 err = proc_put_char(&buffer, &left, '-');
2432                                 if (err)
2433                                         break;
2434                                 err = proc_put_long(&buffer, &left, bit_b, false);
2435                                 if (err)
2436                                         break;
2437                         }
2438
2439                         first = 0; bit_b++;
2440                 }
2441                 if (!err)
2442                         err = proc_put_char(&buffer, &left, '\n');
2443         }
2444
2445         if (!err) {
2446                 if (write) {
2447                         if (*ppos)
2448                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2449                         else
2450                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2451                 }
2452                 kfree(tmp_bitmap);
2453                 *lenp -= left;
2454                 *ppos += *lenp;
2455                 return 0;
2456         } else {
2457                 kfree(tmp_bitmap);
2458                 return err;
2459         }
2460 }
2461
2462 #else /* CONFIG_PROC_SYSCTL */
2463
2464 int proc_dostring(struct ctl_table *table, int write,
2465                   void __user *buffer, size_t *lenp, loff_t *ppos)
2466 {
2467         return -ENOSYS;
2468 }
2469
2470 int proc_dointvec(struct ctl_table *table, int write,
2471                   void __user *buffer, size_t *lenp, loff_t *ppos)
2472 {
2473         return -ENOSYS;
2474 }
2475
2476 int proc_dointvec_minmax(struct ctl_table *table, int write,
2477                     void __user *buffer, size_t *lenp, loff_t *ppos)
2478 {
2479         return -ENOSYS;
2480 }
2481
2482 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2483                     void __user *buffer, size_t *lenp, loff_t *ppos)
2484 {
2485         return -ENOSYS;
2486 }
2487
2488 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2489                     void __user *buffer, size_t *lenp, loff_t *ppos)
2490 {
2491         return -ENOSYS;
2492 }
2493
2494 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2495                              void __user *buffer, size_t *lenp, loff_t *ppos)
2496 {
2497         return -ENOSYS;
2498 }
2499
2500 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2501                     void __user *buffer, size_t *lenp, loff_t *ppos)
2502 {
2503         return -ENOSYS;
2504 }
2505
2506 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2507                                       void __user *buffer,
2508                                       size_t *lenp, loff_t *ppos)
2509 {
2510     return -ENOSYS;
2511 }
2512
2513
2514 #endif /* CONFIG_PROC_SYSCTL */
2515
2516 /*
2517  * No sense putting this after each symbol definition, twice,
2518  * exception granted :-)
2519  */
2520 EXPORT_SYMBOL(proc_dointvec);
2521 EXPORT_SYMBOL(proc_dointvec_jiffies);
2522 EXPORT_SYMBOL(proc_dointvec_minmax);
2523 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2524 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2525 EXPORT_SYMBOL(proc_dostring);
2526 EXPORT_SYMBOL(proc_doulongvec_minmax);
2527 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);