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   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/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/key.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/vmstat.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/acpi.h>
  49 #include <linux/reboot.h>
  50 #include <linux/ftrace.h>
  51
  52 #include <asm/uaccess.h>
  53 #include <asm/processor.h>
  54
  55 #ifdef CONFIG_X86
  56 #include <asm/nmi.h>
  57 #include <asm/stacktrace.h>
  58 #include <asm/io.h>
  59 #endif
  60
  61 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  62
  63 #if defined(CONFIG_SYSCTL)
  64
  65 /* External variables not in a header file. */
  66 extern int C_A_D;
  67 extern int print_fatal_signals;
  68 extern int sysctl_overcommit_memory;
  69 extern int sysctl_overcommit_ratio;
  70 extern int sysctl_panic_on_oom;
  71 extern int sysctl_oom_kill_allocating_task;
  72 extern int sysctl_oom_dump_tasks;
  73 extern int max_threads;
  74 extern int core_uses_pid;
  75 extern int suid_dumpable;
  76 extern char core_pattern[];
  77 extern int pid_max;
  78 extern int min_free_kbytes;
  79 extern int pid_max_min, pid_max_max;
  80 extern int sysctl_drop_caches;
  81 extern int percpu_pagelist_fraction;
  82 extern int compat_log;
  83 extern int maps_protect;
  84 extern int latencytop_enabled;
  85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  86 #ifdef CONFIG_RCU_TORTURE_TEST
  87 extern int rcutorture_runnable;
  88 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
  89
  90 /* Constants used for minimum and  maximum */
  91 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
  92 static int one = 1;
  93 #endif
  94
  95 #ifdef CONFIG_DETECT_SOFTLOCKUP
  96 static int sixty = 60;
  97 static int neg_one = -1;
  98 #endif
  99
 100 #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
 101 static int two = 2;
 102 #endif
 103
 104 static int zero;
 105 static int one_hundred = 100;
 106
 107 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 108 static int maxolduid = 65535;
 109 static int minolduid;
 110 static int min_percpu_pagelist_fract = 8;
 111
 112 static int ngroups_max = NGROUPS_MAX;
 113
 114 #ifdef CONFIG_MODULES
 115 extern char modprobe_path[];
 116 #endif
 117 #ifdef CONFIG_CHR_DEV_SG
 118 extern int sg_big_buff;
 119 #endif
 120
 121 #ifdef __sparc__
 122 extern char reboot_command [];
 123 extern int stop_a_enabled;
 124 extern int scons_pwroff;
 125 #endif
 126
 127 #ifdef __hppa__
 128 extern int pwrsw_enabled;
 129 extern int unaligned_enabled;
 130 #endif
 131
 132 #ifdef CONFIG_S390
 133 #ifdef CONFIG_MATHEMU
 134 extern int sysctl_ieee_emulation_warnings;
 135 #endif
 136 extern int sysctl_userprocess_debug;
 137 extern int spin_retry;
 138 #endif
 139
 140 #ifdef CONFIG_BSD_PROCESS_ACCT
 141 extern int acct_parm[];
 142 #endif
 143
 144 #ifdef CONFIG_IA64
 145 extern int no_unaligned_warning;
 146 #endif
 147
 148 #ifdef CONFIG_RT_MUTEXES
 149 extern int max_lock_depth;
 150 #endif
 151
 152 #ifdef CONFIG_PROC_SYSCTL
 153 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 154                   void __user *buffer, size_t *lenp, loff_t *ppos);
 155 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 156                                void __user *buffer, size_t *lenp, loff_t *ppos);
 157 #endif
 158
 159 static struct ctl_table root_table[];
 160 static struct ctl_table_root sysctl_table_root;
 161 static struct ctl_table_header root_table_header = {
 162         .count = 1,
 163         .ctl_table = root_table,
 164         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
 165         .root = &sysctl_table_root,
 166         .set = &sysctl_table_root.default_set,
 167 };
 168 static struct ctl_table_root sysctl_table_root = {
 169         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 170         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 171 };
 172
 173 static struct ctl_table kern_table[];
 174 static struct ctl_table vm_table[];
 175 static struct ctl_table fs_table[];
 176 static struct ctl_table debug_table[];
 177 static struct ctl_table dev_table[];
 178 extern struct ctl_table random_table[];
 179 #ifdef CONFIG_INOTIFY_USER
 180 extern struct ctl_table inotify_table[];
 181 #endif
 182
 183 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 184 int sysctl_legacy_va_layout;
 185 #endif
 186
 187 extern int prove_locking;
 188 extern int lock_stat;
 189
 190 /* The default sysctl tables: */
 191
 192 static struct ctl_table root_table[] = {
 193         {
 194                 .ctl_name       = CTL_KERN,
 195                 .procname       = "kernel",
 196                 .mode           = 0555,
 197                 .child          = kern_table,
 198         },
 199         {
 200                 .ctl_name       = CTL_VM,
 201                 .procname       = "vm",
 202                 .mode           = 0555,
 203                 .child          = vm_table,
 204         },
 205         {
 206                 .ctl_name       = CTL_FS,
 207                 .procname       = "fs",
 208                 .mode           = 0555,
 209                 .child          = fs_table,
 210         },
 211         {
 212                 .ctl_name       = CTL_DEBUG,
 213                 .procname       = "debug",
 214                 .mode           = 0555,
 215                 .child          = debug_table,
 216         },
 217         {
 218                 .ctl_name       = CTL_DEV,
 219                 .procname       = "dev",
 220                 .mode           = 0555,
 221                 .child          = dev_table,
 222         },
 223 /*
 224  * NOTE: do not add new entries to this table unless you have read
 225  * Documentation/sysctl/ctl_unnumbered.txt
 226  */
 227         { .ctl_name = 0 }
 228 };
 229
 230 #ifdef CONFIG_SCHED_DEBUG
 231 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 232 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 233 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 234 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 235 #endif
 236
 237 static struct ctl_table kern_table[] = {
 238 #ifdef CONFIG_SCHED_DEBUG
 239         {
 240                 .ctl_name       = CTL_UNNUMBERED,
 241                 .procname       = "sched_min_granularity_ns",
 242                 .data           = &sysctl_sched_min_granularity,
 243                 .maxlen         = sizeof(unsigned int),
 244                 .mode           = 0644,
 245                 .proc_handler   = &sched_nr_latency_handler,
 246                 .strategy       = &sysctl_intvec,
 247                 .extra1         = &min_sched_granularity_ns,
 248                 .extra2         = &max_sched_granularity_ns,
 249         },
 250         {
 251                 .ctl_name       = CTL_UNNUMBERED,
 252                 .procname       = "sched_latency_ns",
 253                 .data           = &sysctl_sched_latency,
 254                 .maxlen         = sizeof(unsigned int),
 255                 .mode           = 0644,
 256                 .proc_handler   = &sched_nr_latency_handler,
 257                 .strategy       = &sysctl_intvec,
 258                 .extra1         = &min_sched_granularity_ns,
 259                 .extra2         = &max_sched_granularity_ns,
 260         },
 261         {
 262                 .ctl_name       = CTL_UNNUMBERED,
 263                 .procname       = "sched_wakeup_granularity_ns",
 264                 .data           = &sysctl_sched_wakeup_granularity,
 265                 .maxlen         = sizeof(unsigned int),
 266                 .mode           = 0644,
 267                 .proc_handler   = &proc_dointvec_minmax,
 268                 .strategy       = &sysctl_intvec,
 269                 .extra1         = &min_wakeup_granularity_ns,
 270                 .extra2         = &max_wakeup_granularity_ns,
 271         },
 272         {
 273                 .ctl_name       = CTL_UNNUMBERED,
 274                 .procname       = "sched_shares_ratelimit",
 275                 .data           = &sysctl_sched_shares_ratelimit,
 276                 .maxlen         = sizeof(unsigned int),
 277                 .mode           = 0644,
 278                 .proc_handler   = &proc_dointvec,
 279         },
 280         {
 281                 .ctl_name       = CTL_UNNUMBERED,
 282                 .procname       = "sched_child_runs_first",
 283                 .data           = &sysctl_sched_child_runs_first,
 284                 .maxlen         = sizeof(unsigned int),
 285                 .mode           = 0644,
 286                 .proc_handler   = &proc_dointvec,
 287         },
 288         {
 289                 .ctl_name       = CTL_UNNUMBERED,
 290                 .procname       = "sched_features",
 291                 .data           = &sysctl_sched_features,
 292                 .maxlen         = sizeof(unsigned int),
 293                 .mode           = 0644,
 294                 .proc_handler   = &proc_dointvec,
 295         },
 296         {
 297                 .ctl_name       = CTL_UNNUMBERED,
 298                 .procname       = "sched_migration_cost",
 299                 .data           = &sysctl_sched_migration_cost,
 300                 .maxlen         = sizeof(unsigned int),
 301                 .mode           = 0644,
 302                 .proc_handler   = &proc_dointvec,
 303         },
 304         {
 305                 .ctl_name       = CTL_UNNUMBERED,
 306                 .procname       = "sched_nr_migrate",
 307                 .data           = &sysctl_sched_nr_migrate,
 308                 .maxlen         = sizeof(unsigned int),
 309                 .mode           = 0644,
 310                 .proc_handler   = &proc_dointvec,
 311         },
 312 #endif
 313         {
 314                 .ctl_name       = CTL_UNNUMBERED,
 315                 .procname       = "sched_rt_period_us",
 316                 .data           = &sysctl_sched_rt_period,
 317                 .maxlen         = sizeof(unsigned int),
 318                 .mode           = 0644,
 319                 .proc_handler   = &sched_rt_handler,
 320         },
 321         {
 322                 .ctl_name       = CTL_UNNUMBERED,
 323                 .procname       = "sched_rt_runtime_us",
 324                 .data           = &sysctl_sched_rt_runtime,
 325                 .maxlen         = sizeof(int),
 326                 .mode           = 0644,
 327                 .proc_handler   = &sched_rt_handler,
 328         },
 329         {
 330                 .ctl_name       = CTL_UNNUMBERED,
 331                 .procname       = "sched_compat_yield",
 332                 .data           = &sysctl_sched_compat_yield,
 333                 .maxlen         = sizeof(unsigned int),
 334                 .mode           = 0644,
 335                 .proc_handler   = &proc_dointvec,
 336         },
 337 #ifdef CONFIG_PROVE_LOCKING
 338         {
 339                 .ctl_name       = CTL_UNNUMBERED,
 340                 .procname       = "prove_locking",
 341                 .data           = &prove_locking,
 342                 .maxlen         = sizeof(int),
 343                 .mode           = 0644,
 344                 .proc_handler   = &proc_dointvec,
 345         },
 346 #endif
 347 #ifdef CONFIG_LOCK_STAT
 348         {
 349                 .ctl_name       = CTL_UNNUMBERED,
 350                 .procname       = "lock_stat",
 351                 .data           = &lock_stat,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = &proc_dointvec,
 355         },
 356 #endif
 357         {
 358                 .ctl_name       = KERN_PANIC,
 359                 .procname       = "panic",
 360                 .data           = &panic_timeout,
 361                 .maxlen         = sizeof(int),
 362                 .mode           = 0644,
 363                 .proc_handler   = &proc_dointvec,
 364         },
 365         {
 366                 .ctl_name       = KERN_CORE_USES_PID,
 367                 .procname       = "core_uses_pid",
 368                 .data           = &core_uses_pid,
 369                 .maxlen         = sizeof(int),
 370                 .mode           = 0644,
 371                 .proc_handler   = &proc_dointvec,
 372         },
 373         {
 374                 .ctl_name       = KERN_CORE_PATTERN,
 375                 .procname       = "core_pattern",
 376                 .data           = core_pattern,
 377                 .maxlen         = CORENAME_MAX_SIZE,
 378                 .mode           = 0644,
 379                 .proc_handler   = &proc_dostring,
 380                 .strategy       = &sysctl_string,
 381         },
 382 #ifdef CONFIG_PROC_SYSCTL
 383         {
 384                 .procname       = "tainted",
 385                 .data           = &tainted,
 386                 .maxlen         = sizeof(int),
 387                 .mode           = 0644,
 388                 .proc_handler   = &proc_dointvec_taint,
 389         },
 390 #endif
 391 #ifdef CONFIG_LATENCYTOP
 392         {
 393                 .procname       = "latencytop",
 394                 .data           = &latencytop_enabled,
 395                 .maxlen         = sizeof(int),
 396                 .mode           = 0644,
 397                 .proc_handler   = &proc_dointvec,
 398         },
 399 #endif
 400 #ifdef CONFIG_BLK_DEV_INITRD
 401         {
 402                 .ctl_name       = KERN_REALROOTDEV,
 403                 .procname       = "real-root-dev",
 404                 .data           = &real_root_dev,
 405                 .maxlen         = sizeof(int),
 406                 .mode           = 0644,
 407                 .proc_handler   = &proc_dointvec,
 408         },
 409 #endif
 410         {
 411                 .ctl_name       = CTL_UNNUMBERED,
 412                 .procname       = "print-fatal-signals",
 413                 .data           = &print_fatal_signals,
 414                 .maxlen         = sizeof(int),
 415                 .mode           = 0644,
 416                 .proc_handler   = &proc_dointvec,
 417         },
 418 #ifdef __sparc__
 419         {
 420                 .ctl_name       = KERN_SPARC_REBOOT,
 421                 .procname       = "reboot-cmd",
 422                 .data           = reboot_command,
 423                 .maxlen         = 256,
 424                 .mode           = 0644,
 425                 .proc_handler   = &proc_dostring,
 426                 .strategy       = &sysctl_string,
 427         },
 428         {
 429                 .ctl_name       = KERN_SPARC_STOP_A,
 430                 .procname       = "stop-a",
 431                 .data           = &stop_a_enabled,
 432                 .maxlen         = sizeof (int),
 433                 .mode           = 0644,
 434                 .proc_handler   = &proc_dointvec,
 435         },
 436         {
 437                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 438                 .procname       = "scons-poweroff",
 439                 .data           = &scons_pwroff,
 440                 .maxlen         = sizeof (int),
 441                 .mode           = 0644,
 442                 .proc_handler   = &proc_dointvec,
 443         },
 444 #endif
 445 #ifdef __hppa__
 446         {
 447                 .ctl_name       = KERN_HPPA_PWRSW,
 448                 .procname       = "soft-power",
 449                 .data           = &pwrsw_enabled,
 450                 .maxlen         = sizeof (int),
 451                 .mode           = 0644,
 452                 .proc_handler   = &proc_dointvec,
 453         },
 454         {
 455                 .ctl_name       = KERN_HPPA_UNALIGNED,
 456                 .procname       = "unaligned-trap",
 457                 .data           = &unaligned_enabled,
 458                 .maxlen         = sizeof (int),
 459                 .mode           = 0644,
 460                 .proc_handler   = &proc_dointvec,
 461         },
 462 #endif
 463         {
 464                 .ctl_name       = KERN_CTLALTDEL,
 465                 .procname       = "ctrl-alt-del",
 466                 .data           = &C_A_D,
 467                 .maxlen         = sizeof(int),
 468                 .mode           = 0644,
 469                 .proc_handler   = &proc_dointvec,
 470         },
 471 #ifdef CONFIG_FTRACE
 472         {
 473                 .ctl_name       = CTL_UNNUMBERED,
 474                 .procname       = "ftrace_enabled",
 475                 .data           = &ftrace_enabled,
 476                 .maxlen         = sizeof(int),
 477                 .mode           = 0644,
 478                 .proc_handler   = &ftrace_enable_sysctl,
 479         },
 480 #endif
 481 #ifdef CONFIG_MODULES
 482         {
 483                 .ctl_name       = KERN_MODPROBE,
 484                 .procname       = "modprobe",
 485                 .data           = &modprobe_path,
 486                 .maxlen         = KMOD_PATH_LEN,
 487                 .mode           = 0644,
 488                 .proc_handler   = &proc_dostring,
 489                 .strategy       = &sysctl_string,
 490         },
 491 #endif
 492 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 493         {
 494                 .ctl_name       = KERN_HOTPLUG,
 495                 .procname       = "hotplug",
 496                 .data           = &uevent_helper,
 497                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 498                 .mode           = 0644,
 499                 .proc_handler   = &proc_dostring,
 500                 .strategy       = &sysctl_string,
 501         },
 502 #endif
 503 #ifdef CONFIG_CHR_DEV_SG
 504         {
 505                 .ctl_name       = KERN_SG_BIG_BUFF,
 506                 .procname       = "sg-big-buff",
 507                 .data           = &sg_big_buff,
 508                 .maxlen         = sizeof (int),
 509                 .mode           = 0444,
 510                 .proc_handler   = &proc_dointvec,
 511         },
 512 #endif
 513 #ifdef CONFIG_BSD_PROCESS_ACCT
 514         {
 515                 .ctl_name       = KERN_ACCT,
 516                 .procname       = "acct",
 517                 .data           = &acct_parm,
 518                 .maxlen         = 3*sizeof(int),
 519                 .mode           = 0644,
 520                 .proc_handler   = &proc_dointvec,
 521         },
 522 #endif
 523 #ifdef CONFIG_MAGIC_SYSRQ
 524         {
 525                 .ctl_name       = KERN_SYSRQ,
 526                 .procname       = "sysrq",
 527                 .data           = &__sysrq_enabled,
 528                 .maxlen         = sizeof (int),
 529                 .mode           = 0644,
 530                 .proc_handler   = &proc_dointvec,
 531         },
 532 #endif
 533 #ifdef CONFIG_PROC_SYSCTL
 534         {
 535                 .procname       = "cad_pid",
 536                 .data           = NULL,
 537                 .maxlen         = sizeof (int),
 538                 .mode           = 0600,
 539                 .proc_handler   = &proc_do_cad_pid,
 540         },
 541 #endif
 542         {
 543                 .ctl_name       = KERN_MAX_THREADS,
 544                 .procname       = "threads-max",
 545                 .data           = &max_threads,
 546                 .maxlen         = sizeof(int),
 547                 .mode           = 0644,
 548                 .proc_handler   = &proc_dointvec,
 549         },
 550         {
 551                 .ctl_name       = KERN_RANDOM,
 552                 .procname       = "random",
 553                 .mode           = 0555,
 554                 .child          = random_table,
 555         },
 556         {
 557                 .ctl_name       = KERN_OVERFLOWUID,
 558                 .procname       = "overflowuid",
 559                 .data           = &overflowuid,
 560                 .maxlen         = sizeof(int),
 561                 .mode           = 0644,
 562                 .proc_handler   = &proc_dointvec_minmax,
 563                 .strategy       = &sysctl_intvec,
 564                 .extra1         = &minolduid,
 565                 .extra2         = &maxolduid,
 566         },
 567         {
 568                 .ctl_name       = KERN_OVERFLOWGID,
 569                 .procname       = "overflowgid",
 570                 .data           = &overflowgid,
 571                 .maxlen         = sizeof(int),
 572                 .mode           = 0644,
 573                 .proc_handler   = &proc_dointvec_minmax,
 574                 .strategy       = &sysctl_intvec,
 575                 .extra1         = &minolduid,
 576                 .extra2         = &maxolduid,
 577         },
 578 #ifdef CONFIG_S390
 579 #ifdef CONFIG_MATHEMU
 580         {
 581                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 582                 .procname       = "ieee_emulation_warnings",
 583                 .data           = &sysctl_ieee_emulation_warnings,
 584                 .maxlen         = sizeof(int),
 585                 .mode           = 0644,
 586                 .proc_handler   = &proc_dointvec,
 587         },
 588 #endif
 589         {
 590                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 591                 .procname       = "userprocess_debug",
 592                 .data           = &sysctl_userprocess_debug,
 593                 .maxlen         = sizeof(int),
 594                 .mode           = 0644,
 595                 .proc_handler   = &proc_dointvec,
 596         },
 597 #endif
 598         {
 599                 .ctl_name       = KERN_PIDMAX,
 600                 .procname       = "pid_max",
 601                 .data           = &pid_max,
 602                 .maxlen         = sizeof (int),
 603                 .mode           = 0644,
 604                 .proc_handler   = &proc_dointvec_minmax,
 605                 .strategy       = sysctl_intvec,
 606                 .extra1         = &pid_max_min,
 607                 .extra2         = &pid_max_max,
 608         },
 609         {
 610                 .ctl_name       = KERN_PANIC_ON_OOPS,
 611                 .procname       = "panic_on_oops",
 612                 .data           = &panic_on_oops,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec,
 616         },
 617 #if defined CONFIG_PRINTK
 618         {
 619                 .ctl_name       = KERN_PRINTK,
 620                 .procname       = "printk",
 621                 .data           = &console_loglevel,
 622                 .maxlen         = 4*sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = &proc_dointvec,
 625         },
 626         {
 627                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 628                 .procname       = "printk_ratelimit",
 629                 .data           = &printk_ratelimit_state.interval,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 .proc_handler   = &proc_dointvec_jiffies,
 633                 .strategy       = &sysctl_jiffies,
 634         },
 635         {
 636                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 637                 .procname       = "printk_ratelimit_burst",
 638                 .data           = &printk_ratelimit_state.burst,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 .proc_handler   = &proc_dointvec,
 642         },
 643 #endif
 644         {
 645                 .ctl_name       = KERN_NGROUPS_MAX,
 646                 .procname       = "ngroups_max",
 647                 .data           = &ngroups_max,
 648                 .maxlen         = sizeof (int),
 649                 .mode           = 0444,
 650                 .proc_handler   = &proc_dointvec,
 651         },
 652 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 653         {
 654                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 655                 .procname       = "unknown_nmi_panic",
 656                 .data           = &unknown_nmi_panic,
 657                 .maxlen         = sizeof (int),
 658                 .mode           = 0644,
 659                 .proc_handler   = &proc_dointvec,
 660         },
 661         {
 662                 .procname       = "nmi_watchdog",
 663                 .data           = &nmi_watchdog_enabled,
 664                 .maxlen         = sizeof (int),
 665                 .mode           = 0644,
 666                 .proc_handler   = &proc_nmi_enabled,
 667         },
 668 #endif
 669 #if defined(CONFIG_X86)
 670         {
 671                 .ctl_name       = KERN_PANIC_ON_NMI,
 672                 .procname       = "panic_on_unrecovered_nmi",
 673                 .data           = &panic_on_unrecovered_nmi,
 674                 .maxlen         = sizeof(int),
 675                 .mode           = 0644,
 676                 .proc_handler   = &proc_dointvec,
 677         },
 678         {
 679                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 680                 .procname       = "bootloader_type",
 681                 .data           = &bootloader_type,
 682                 .maxlen         = sizeof (int),
 683                 .mode           = 0444,
 684                 .proc_handler   = &proc_dointvec,
 685         },
 686         {
 687                 .ctl_name       = CTL_UNNUMBERED,
 688                 .procname       = "kstack_depth_to_print",
 689                 .data           = &kstack_depth_to_print,
 690                 .maxlen         = sizeof(int),
 691                 .mode           = 0644,
 692                 .proc_handler   = &proc_dointvec,
 693         },
 694         {
 695                 .ctl_name       = CTL_UNNUMBERED,
 696                 .procname       = "io_delay_type",
 697                 .data           = &io_delay_type,
 698                 .maxlen         = sizeof(int),
 699                 .mode           = 0644,
 700                 .proc_handler   = &proc_dointvec,
 701         },
 702 #endif
 703 #if defined(CONFIG_MMU)
 704         {
 705                 .ctl_name       = KERN_RANDOMIZE,
 706                 .procname       = "randomize_va_space",
 707                 .data           = &randomize_va_space,
 708                 .maxlen         = sizeof(int),
 709                 .mode           = 0644,
 710                 .proc_handler   = &proc_dointvec,
 711         },
 712 #endif
 713 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 714         {
 715                 .ctl_name       = KERN_SPIN_RETRY,
 716                 .procname       = "spin_retry",
 717                 .data           = &spin_retry,
 718                 .maxlen         = sizeof (int),
 719                 .mode           = 0644,
 720                 .proc_handler   = &proc_dointvec,
 721         },
 722 #endif
 723 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 724         {
 725                 .procname       = "acpi_video_flags",
 726                 .data           = &acpi_realmode_flags,
 727                 .maxlen         = sizeof (unsigned long),
 728                 .mode           = 0644,
 729                 .proc_handler   = &proc_doulongvec_minmax,
 730         },
 731 #endif
 732 #ifdef CONFIG_IA64
 733         {
 734                 .ctl_name       = KERN_IA64_UNALIGNED,
 735                 .procname       = "ignore-unaligned-usertrap",
 736                 .data           = &no_unaligned_warning,
 737                 .maxlen         = sizeof (int),
 738                 .mode           = 0644,
 739                 .proc_handler   = &proc_dointvec,
 740         },
 741 #endif
 742 #ifdef CONFIG_DETECT_SOFTLOCKUP
 743         {
 744                 .ctl_name       = CTL_UNNUMBERED,
 745                 .procname       = "softlockup_panic",
 746                 .data           = &softlockup_panic,
 747                 .maxlen         = sizeof(int),
 748                 .mode           = 0644,
 749                 .proc_handler   = &proc_dointvec_minmax,
 750                 .strategy       = &sysctl_intvec,
 751                 .extra1         = &zero,
 752                 .extra2         = &one,
 753         },
 754         {
 755                 .ctl_name       = CTL_UNNUMBERED,
 756                 .procname       = "softlockup_thresh",
 757                 .data           = &softlockup_thresh,
 758                 .maxlen         = sizeof(int),
 759                 .mode           = 0644,
 760                 .proc_handler   = &proc_dointvec_minmax,
 761                 .strategy       = &sysctl_intvec,
 762                 .extra1         = &neg_one,
 763                 .extra2         = &sixty,
 764         },
 765         {
 766                 .ctl_name       = CTL_UNNUMBERED,
 767                 .procname       = "hung_task_check_count",
 768                 .data           = &sysctl_hung_task_check_count,
 769                 .maxlen         = sizeof(unsigned long),
 770                 .mode           = 0644,
 771                 .proc_handler   = &proc_doulongvec_minmax,
 772                 .strategy       = &sysctl_intvec,
 773         },
 774         {
 775                 .ctl_name       = CTL_UNNUMBERED,
 776                 .procname       = "hung_task_timeout_secs",
 777                 .data           = &sysctl_hung_task_timeout_secs,
 778                 .maxlen         = sizeof(unsigned long),
 779                 .mode           = 0644,
 780                 .proc_handler   = &proc_doulongvec_minmax,
 781                 .strategy       = &sysctl_intvec,
 782         },
 783         {
 784                 .ctl_name       = CTL_UNNUMBERED,
 785                 .procname       = "hung_task_warnings",
 786                 .data           = &sysctl_hung_task_warnings,
 787                 .maxlen         = sizeof(unsigned long),
 788                 .mode           = 0644,
 789                 .proc_handler   = &proc_doulongvec_minmax,
 790                 .strategy       = &sysctl_intvec,
 791         },
 792 #endif
 793 #ifdef CONFIG_COMPAT
 794         {
 795                 .ctl_name       = KERN_COMPAT_LOG,
 796                 .procname       = "compat-log",
 797                 .data           = &compat_log,
 798                 .maxlen         = sizeof (int),
 799                 .mode           = 0644,
 800                 .proc_handler   = &proc_dointvec,
 801         },
 802 #endif
 803 #ifdef CONFIG_RT_MUTEXES
 804         {
 805                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 806                 .procname       = "max_lock_depth",
 807                 .data           = &max_lock_depth,
 808                 .maxlen         = sizeof(int),
 809                 .mode           = 0644,
 810                 .proc_handler   = &proc_dointvec,
 811         },
 812 #endif
 813 #ifdef CONFIG_PROC_FS
 814         {
 815                 .ctl_name       = CTL_UNNUMBERED,
 816                 .procname       = "maps_protect",
 817                 .data           = &maps_protect,
 818                 .maxlen         = sizeof(int),
 819                 .mode           = 0644,
 820                 .proc_handler   = &proc_dointvec,
 821         },
 822 #endif
 823         {
 824                 .ctl_name       = CTL_UNNUMBERED,
 825                 .procname       = "poweroff_cmd",
 826                 .data           = &poweroff_cmd,
 827                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 828                 .mode           = 0644,
 829                 .proc_handler   = &proc_dostring,
 830                 .strategy       = &sysctl_string,
 831         },
 832 #ifdef CONFIG_KEYS
 833         {
 834                 .ctl_name       = CTL_UNNUMBERED,
 835                 .procname       = "keys",
 836                 .mode           = 0555,
 837                 .child          = key_sysctls,
 838         },
 839 #endif
 840 #ifdef CONFIG_RCU_TORTURE_TEST
 841         {
 842                 .ctl_name       = CTL_UNNUMBERED,
 843                 .procname       = "rcutorture_runnable",
 844                 .data           = &rcutorture_runnable,
 845                 .maxlen         = sizeof(int),
 846                 .mode           = 0644,
 847                 .proc_handler   = &proc_dointvec,
 848         },
 849 #endif
 850 /*
 851  * NOTE: do not add new entries to this table unless you have read
 852  * Documentation/sysctl/ctl_unnumbered.txt
 853  */
 854         { .ctl_name = 0 }
 855 };
 856
 857 static struct ctl_table vm_table[] = {
 858         {
 859                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 860                 .procname       = "overcommit_memory",
 861                 .data           = &sysctl_overcommit_memory,
 862                 .maxlen         = sizeof(sysctl_overcommit_memory),
 863                 .mode           = 0644,
 864                 .proc_handler   = &proc_dointvec,
 865         },
 866         {
 867                 .ctl_name       = VM_PANIC_ON_OOM,
 868                 .procname       = "panic_on_oom",
 869                 .data           = &sysctl_panic_on_oom,
 870                 .maxlen         = sizeof(sysctl_panic_on_oom),
 871                 .mode           = 0644,
 872                 .proc_handler   = &proc_dointvec,
 873         },
 874         {
 875                 .ctl_name       = CTL_UNNUMBERED,
 876                 .procname       = "oom_kill_allocating_task",
 877                 .data           = &sysctl_oom_kill_allocating_task,
 878                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 879                 .mode           = 0644,
 880                 .proc_handler   = &proc_dointvec,
 881         },
 882         {
 883                 .ctl_name       = CTL_UNNUMBERED,
 884                 .procname       = "oom_dump_tasks",
 885                 .data           = &sysctl_oom_dump_tasks,
 886                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 887                 .mode           = 0644,
 888                 .proc_handler   = &proc_dointvec,
 889         },
 890         {
 891                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 892                 .procname       = "overcommit_ratio",
 893                 .data           = &sysctl_overcommit_ratio,
 894                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 895                 .mode           = 0644,
 896                 .proc_handler   = &proc_dointvec,
 897         },
 898         {
 899                 .ctl_name       = VM_PAGE_CLUSTER,
 900                 .procname       = "page-cluster",
 901                 .data           = &page_cluster,
 902                 .maxlen         = sizeof(int),
 903                 .mode           = 0644,
 904                 .proc_handler   = &proc_dointvec,
 905         },
 906         {
 907                 .ctl_name       = VM_DIRTY_BACKGROUND,
 908                 .procname       = "dirty_background_ratio",
 909                 .data           = &dirty_background_ratio,
 910                 .maxlen         = sizeof(dirty_background_ratio),
 911                 .mode           = 0644,
 912                 .proc_handler   = &proc_dointvec_minmax,
 913                 .strategy       = &sysctl_intvec,
 914                 .extra1         = &zero,
 915                 .extra2         = &one_hundred,
 916         },
 917         {
 918                 .ctl_name       = VM_DIRTY_RATIO,
 919                 .procname       = "dirty_ratio",
 920                 .data           = &vm_dirty_ratio,
 921                 .maxlen         = sizeof(vm_dirty_ratio),
 922                 .mode           = 0644,
 923                 .proc_handler   = &dirty_ratio_handler,
 924                 .strategy       = &sysctl_intvec,
 925                 .extra1         = &zero,
 926                 .extra2         = &one_hundred,
 927         },
 928         {
 929                 .procname       = "dirty_writeback_centisecs",
 930                 .data           = &dirty_writeback_interval,
 931                 .maxlen         = sizeof(dirty_writeback_interval),
 932                 .mode           = 0644,
 933                 .proc_handler   = &dirty_writeback_centisecs_handler,
 934         },
 935         {
 936                 .procname       = "dirty_expire_centisecs",
 937                 .data           = &dirty_expire_interval,
 938                 .maxlen         = sizeof(dirty_expire_interval),
 939                 .mode           = 0644,
 940                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 941         },
 942         {
 943                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 944                 .procname       = "nr_pdflush_threads",
 945                 .data           = &nr_pdflush_threads,
 946                 .maxlen         = sizeof nr_pdflush_threads,
 947                 .mode           = 0444 /* read-only*/,
 948                 .proc_handler   = &proc_dointvec,
 949         },
 950         {
 951                 .ctl_name       = VM_SWAPPINESS,
 952                 .procname       = "swappiness",
 953                 .data           = &vm_swappiness,
 954                 .maxlen         = sizeof(vm_swappiness),
 955                 .mode           = 0644,
 956                 .proc_handler   = &proc_dointvec_minmax,
 957                 .strategy       = &sysctl_intvec,
 958                 .extra1         = &zero,
 959                 .extra2         = &one_hundred,
 960         },
 961 #ifdef CONFIG_HUGETLB_PAGE
 962          {
 963                 .procname       = "nr_hugepages",
 964                 .data           = NULL,
 965                 .maxlen         = sizeof(unsigned long),
 966                 .mode           = 0644,
 967                 .proc_handler   = &hugetlb_sysctl_handler,
 968                 .extra1         = (void *)&hugetlb_zero,
 969                 .extra2         = (void *)&hugetlb_infinity,
 970          },
 971          {
 972                 .ctl_name       = VM_HUGETLB_GROUP,
 973                 .procname       = "hugetlb_shm_group",
 974                 .data           = &sysctl_hugetlb_shm_group,
 975                 .maxlen         = sizeof(gid_t),
 976                 .mode           = 0644,
 977                 .proc_handler   = &proc_dointvec,
 978          },
 979          {
 980                 .ctl_name       = CTL_UNNUMBERED,
 981                 .procname       = "hugepages_treat_as_movable",
 982                 .data           = &hugepages_treat_as_movable,
 983                 .maxlen         = sizeof(int),
 984                 .mode           = 0644,
 985                 .proc_handler   = &hugetlb_treat_movable_handler,
 986         },
 987         {
 988                 .ctl_name       = CTL_UNNUMBERED,
 989                 .procname       = "nr_overcommit_hugepages",
 990                 .data           = NULL,
 991                 .maxlen         = sizeof(unsigned long),
 992                 .mode           = 0644,
 993                 .proc_handler   = &hugetlb_overcommit_handler,
 994                 .extra1         = (void *)&hugetlb_zero,
 995                 .extra2         = (void *)&hugetlb_infinity,
 996         },
 997 #endif
 998         {
 999                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
1000                 .procname       = "lowmem_reserve_ratio",
1001                 .data           = &sysctl_lowmem_reserve_ratio,
1002                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1003                 .mode           = 0644,
1004                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1005                 .strategy       = &sysctl_intvec,
1006         },
1007         {
1008                 .ctl_name       = VM_DROP_PAGECACHE,
1009                 .procname       = "drop_caches",
1010                 .data           = &sysctl_drop_caches,
1011                 .maxlen         = sizeof(int),
1012                 .mode           = 0644,
1013                 .proc_handler   = drop_caches_sysctl_handler,
1014                 .strategy       = &sysctl_intvec,
1015         },
1016         {
1017                 .ctl_name       = VM_MIN_FREE_KBYTES,
1018                 .procname       = "min_free_kbytes",
1019                 .data           = &min_free_kbytes,
1020                 .maxlen         = sizeof(min_free_kbytes),
1021                 .mode           = 0644,
1022                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1023                 .strategy       = &sysctl_intvec,
1024                 .extra1         = &zero,
1025         },
1026         {
1027                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1028                 .procname       = "percpu_pagelist_fraction",
1029                 .data           = &percpu_pagelist_fraction,
1030                 .maxlen         = sizeof(percpu_pagelist_fraction),
1031                 .mode           = 0644,
1032                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1033                 .strategy       = &sysctl_intvec,
1034                 .extra1         = &min_percpu_pagelist_fract,
1035         },
1036 #ifdef CONFIG_MMU
1037         {
1038                 .ctl_name       = VM_MAX_MAP_COUNT,
1039                 .procname       = "max_map_count",
1040                 .data           = &sysctl_max_map_count,
1041                 .maxlen         = sizeof(sysctl_max_map_count),
1042                 .mode           = 0644,
1043                 .proc_handler   = &proc_dointvec
1044         },
1045 #endif
1046         {
1047                 .ctl_name       = VM_LAPTOP_MODE,
1048                 .procname       = "laptop_mode",
1049                 .data           = &laptop_mode,
1050                 .maxlen         = sizeof(laptop_mode),
1051                 .mode           = 0644,
1052                 .proc_handler   = &proc_dointvec_jiffies,
1053                 .strategy       = &sysctl_jiffies,
1054         },
1055         {
1056                 .ctl_name       = VM_BLOCK_DUMP,
1057                 .procname       = "block_dump",
1058                 .data           = &block_dump,
1059                 .maxlen         = sizeof(block_dump),
1060                 .mode           = 0644,
1061                 .proc_handler   = &proc_dointvec,
1062                 .strategy       = &sysctl_intvec,
1063                 .extra1         = &zero,
1064         },
1065         {
1066                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1067                 .procname       = "vfs_cache_pressure",
1068                 .data           = &sysctl_vfs_cache_pressure,
1069                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1070                 .mode           = 0644,
1071                 .proc_handler   = &proc_dointvec,
1072                 .strategy       = &sysctl_intvec,
1073                 .extra1         = &zero,
1074         },
1075 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1076         {
1077                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1078                 .procname       = "legacy_va_layout",
1079                 .data           = &sysctl_legacy_va_layout,
1080                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1081                 .mode           = 0644,
1082                 .proc_handler   = &proc_dointvec,
1083                 .strategy       = &sysctl_intvec,
1084                 .extra1         = &zero,
1085         },
1086 #endif
1087 #ifdef CONFIG_NUMA
1088         {
1089                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1090                 .procname       = "zone_reclaim_mode",
1091                 .data           = &zone_reclaim_mode,
1092                 .maxlen         = sizeof(zone_reclaim_mode),
1093                 .mode           = 0644,
1094                 .proc_handler   = &proc_dointvec,
1095                 .strategy       = &sysctl_intvec,
1096                 .extra1         = &zero,
1097         },
1098         {
1099                 .ctl_name       = VM_MIN_UNMAPPED,
1100                 .procname       = "min_unmapped_ratio",
1101                 .data           = &sysctl_min_unmapped_ratio,
1102                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1103                 .mode           = 0644,
1104                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1105                 .strategy       = &sysctl_intvec,
1106                 .extra1         = &zero,
1107                 .extra2         = &one_hundred,
1108         },
1109         {
1110                 .ctl_name       = VM_MIN_SLAB,
1111                 .procname       = "min_slab_ratio",
1112                 .data           = &sysctl_min_slab_ratio,
1113                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1114                 .mode           = 0644,
1115                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1116                 .strategy       = &sysctl_intvec,
1117                 .extra1         = &zero,
1118                 .extra2         = &one_hundred,
1119         },
1120 #endif
1121 #ifdef CONFIG_SMP
1122         {
1123                 .ctl_name       = CTL_UNNUMBERED,
1124                 .procname       = "stat_interval",
1125                 .data           = &sysctl_stat_interval,
1126                 .maxlen         = sizeof(sysctl_stat_interval),
1127                 .mode           = 0644,
1128                 .proc_handler   = &proc_dointvec_jiffies,
1129                 .strategy       = &sysctl_jiffies,
1130         },
1131 #endif
1132 #ifdef CONFIG_SECURITY
1133         {
1134                 .ctl_name       = CTL_UNNUMBERED,
1135                 .procname       = "mmap_min_addr",
1136                 .data           = &mmap_min_addr,
1137                 .maxlen         = sizeof(unsigned long),
1138                 .mode           = 0644,
1139                 .proc_handler   = &proc_doulongvec_minmax,
1140         },
1141 #endif
1142 #ifdef CONFIG_NUMA
1143         {
1144                 .ctl_name       = CTL_UNNUMBERED,
1145                 .procname       = "numa_zonelist_order",
1146                 .data           = &numa_zonelist_order,
1147                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1148                 .mode           = 0644,
1149                 .proc_handler   = &numa_zonelist_order_handler,
1150                 .strategy       = &sysctl_string,
1151         },
1152 #endif
1153 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1154    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1155         {
1156                 .ctl_name       = VM_VDSO_ENABLED,
1157                 .procname       = "vdso_enabled",
1158                 .data           = &vdso_enabled,
1159                 .maxlen         = sizeof(vdso_enabled),
1160                 .mode           = 0644,
1161                 .proc_handler   = &proc_dointvec,
1162                 .strategy       = &sysctl_intvec,
1163                 .extra1         = &zero,
1164         },
1165 #endif
1166 #ifdef CONFIG_HIGHMEM
1167         {
1168                 .ctl_name       = CTL_UNNUMBERED,
1169                 .procname       = "highmem_is_dirtyable",
1170                 .data           = &vm_highmem_is_dirtyable,
1171                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1172                 .mode           = 0644,
1173                 .proc_handler   = &proc_dointvec_minmax,
1174                 .strategy       = &sysctl_intvec,
1175                 .extra1         = &zero,
1176                 .extra2         = &one,
1177         },
1178 #endif
1179 /*
1180  * NOTE: do not add new entries to this table unless you have read
1181  * Documentation/sysctl/ctl_unnumbered.txt
1182  */
1183         { .ctl_name = 0 }
1184 };
1185
1186 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1187 static struct ctl_table binfmt_misc_table[] = {
1188         { .ctl_name = 0 }
1189 };
1190 #endif
1191
1192 static struct ctl_table fs_table[] = {
1193         {
1194                 .ctl_name       = FS_NRINODE,
1195                 .procname       = "inode-nr",
1196                 .data           = &inodes_stat,
1197                 .maxlen         = 2*sizeof(int),
1198                 .mode           = 0444,
1199                 .proc_handler   = &proc_dointvec,
1200         },
1201         {
1202                 .ctl_name       = FS_STATINODE,
1203                 .procname       = "inode-state",
1204                 .data           = &inodes_stat,
1205                 .maxlen         = 7*sizeof(int),
1206                 .mode           = 0444,
1207                 .proc_handler   = &proc_dointvec,
1208         },
1209         {
1210                 .procname       = "file-nr",
1211                 .data           = &files_stat,
1212                 .maxlen         = 3*sizeof(int),
1213                 .mode           = 0444,
1214                 .proc_handler   = &proc_nr_files,
1215         },
1216         {
1217                 .ctl_name       = FS_MAXFILE,
1218                 .procname       = "file-max",
1219                 .data           = &files_stat.max_files,
1220                 .maxlen         = sizeof(int),
1221                 .mode           = 0644,
1222                 .proc_handler   = &proc_dointvec,
1223         },
1224         {
1225                 .ctl_name       = CTL_UNNUMBERED,
1226                 .procname       = "nr_open",
1227                 .data           = &sysctl_nr_open,
1228                 .maxlen         = sizeof(int),
1229                 .mode           = 0644,
1230                 .proc_handler   = &proc_dointvec_minmax,
1231                 .extra1         = &sysctl_nr_open_min,
1232                 .extra2         = &sysctl_nr_open_max,
1233         },
1234         {
1235                 .ctl_name       = FS_DENTRY,
1236                 .procname       = "dentry-state",
1237                 .data           = &dentry_stat,
1238                 .maxlen         = 6*sizeof(int),
1239                 .mode           = 0444,
1240                 .proc_handler   = &proc_dointvec,
1241         },
1242         {
1243                 .ctl_name       = FS_OVERFLOWUID,
1244                 .procname       = "overflowuid",
1245                 .data           = &fs_overflowuid,
1246                 .maxlen         = sizeof(int),
1247                 .mode           = 0644,
1248                 .proc_handler   = &proc_dointvec_minmax,
1249                 .strategy       = &sysctl_intvec,
1250                 .extra1         = &minolduid,
1251                 .extra2         = &maxolduid,
1252         },
1253         {
1254                 .ctl_name       = FS_OVERFLOWGID,
1255                 .procname       = "overflowgid",
1256                 .data           = &fs_overflowgid,
1257                 .maxlen         = sizeof(int),
1258                 .mode           = 0644,
1259                 .proc_handler   = &proc_dointvec_minmax,
1260                 .strategy       = &sysctl_intvec,
1261                 .extra1         = &minolduid,
1262                 .extra2         = &maxolduid,
1263         },
1264 #ifdef CONFIG_FILE_LOCKING
1265         {
1266                 .ctl_name       = FS_LEASES,
1267                 .procname       = "leases-enable",
1268                 .data           = &leases_enable,
1269                 .maxlen         = sizeof(int),
1270                 .mode           = 0644,
1271                 .proc_handler   = &proc_dointvec,
1272         },
1273 #endif
1274 #ifdef CONFIG_DNOTIFY
1275         {
1276                 .ctl_name       = FS_DIR_NOTIFY,
1277                 .procname       = "dir-notify-enable",
1278                 .data           = &dir_notify_enable,
1279                 .maxlen         = sizeof(int),
1280                 .mode           = 0644,
1281                 .proc_handler   = &proc_dointvec,
1282         },
1283 #endif
1284 #ifdef CONFIG_MMU
1285 #ifdef CONFIG_FILE_LOCKING
1286         {
1287                 .ctl_name       = FS_LEASE_TIME,
1288                 .procname       = "lease-break-time",
1289                 .data           = &lease_break_time,
1290                 .maxlen         = sizeof(int),
1291                 .mode           = 0644,
1292                 .proc_handler   = &proc_dointvec_minmax,
1293                 .strategy       = &sysctl_intvec,
1294                 .extra1         = &zero,
1295                 .extra2         = &two,
1296         },
1297 #endif
1298         {
1299                 .procname       = "aio-nr",
1300                 .data           = &aio_nr,
1301                 .maxlen         = sizeof(aio_nr),
1302                 .mode           = 0444,
1303                 .proc_handler   = &proc_doulongvec_minmax,
1304         },
1305         {
1306                 .procname       = "aio-max-nr",
1307                 .data           = &aio_max_nr,
1308                 .maxlen         = sizeof(aio_max_nr),
1309                 .mode           = 0644,
1310                 .proc_handler   = &proc_doulongvec_minmax,
1311         },
1312 #ifdef CONFIG_INOTIFY_USER
1313         {
1314                 .ctl_name       = FS_INOTIFY,
1315                 .procname       = "inotify",
1316                 .mode           = 0555,
1317                 .child          = inotify_table,
1318         },
1319 #endif
1320 #endif
1321         {
1322                 .ctl_name       = KERN_SETUID_DUMPABLE,
1323                 .procname       = "suid_dumpable",
1324                 .data           = &suid_dumpable,
1325                 .maxlen         = sizeof(int),
1326                 .mode           = 0644,
1327                 .proc_handler   = &proc_dointvec,
1328         },
1329 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1330         {
1331                 .ctl_name       = CTL_UNNUMBERED,
1332                 .procname       = "binfmt_misc",
1333                 .mode           = 0555,
1334                 .child          = binfmt_misc_table,
1335         },
1336 #endif
1337 /*
1338  * NOTE: do not add new entries to this table unless you have read
1339  * Documentation/sysctl/ctl_unnumbered.txt
1340  */
1341         { .ctl_name = 0 }
1342 };
1343
1344 static struct ctl_table debug_table[] = {
1345 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1346         {
1347                 .ctl_name       = CTL_UNNUMBERED,
1348                 .procname       = "exception-trace",
1349                 .data           = &show_unhandled_signals,
1350                 .maxlen         = sizeof(int),
1351                 .mode           = 0644,
1352                 .proc_handler   = proc_dointvec
1353         },
1354 #endif
1355         { .ctl_name = 0 }
1356 };
1357
1358 static struct ctl_table dev_table[] = {
1359         { .ctl_name = 0 }
1360 };
1361
1362 static DEFINE_SPINLOCK(sysctl_lock);
1363
1364 /* called under sysctl_lock */
1365 static int use_table(struct ctl_table_header *p)
1366 {
1367         if (unlikely(p->unregistering))
1368                 return 0;
1369         p->used++;
1370         return 1;
1371 }
1372
1373 /* called under sysctl_lock */
1374 static void unuse_table(struct ctl_table_header *p)
1375 {
1376         if (!--p->used)
1377                 if (unlikely(p->unregistering))
1378                         complete(p->unregistering);
1379 }
1380
1381 /* called under sysctl_lock, will reacquire if has to wait */
1382 static void start_unregistering(struct ctl_table_header *p)
1383 {
1384         /*
1385          * if p->used is 0, nobody will ever touch that entry again;
1386          * we'll eliminate all paths to it before dropping sysctl_lock
1387          */
1388         if (unlikely(p->used)) {
1389                 struct completion wait;
1390                 init_completion(&wait);
1391                 p->unregistering = &wait;
1392                 spin_unlock(&sysctl_lock);
1393                 wait_for_completion(&wait);
1394                 spin_lock(&sysctl_lock);
1395         } else {
1396                 /* anything non-NULL; we'll never dereference it */
1397                 p->unregistering = ERR_PTR(-EINVAL);
1398         }
1399         /*
1400          * do not remove from the list until nobody holds it; walking the
1401          * list in do_sysctl() relies on that.
1402          */
1403         list_del_init(&p->ctl_entry);
1404 }
1405
1406 void sysctl_head_get(struct ctl_table_header *head)
1407 {
1408         spin_lock(&sysctl_lock);
1409         head->count++;
1410         spin_unlock(&sysctl_lock);
1411 }
1412
1413 void sysctl_head_put(struct ctl_table_header *head)
1414 {
1415         spin_lock(&sysctl_lock);
1416         if (!--head->count)
1417                 kfree(head);
1418         spin_unlock(&sysctl_lock);
1419 }
1420
1421 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1422 {
1423         if (!head)
1424                 BUG();
1425         spin_lock(&sysctl_lock);
1426         if (!use_table(head))
1427                 head = ERR_PTR(-ENOENT);
1428         spin_unlock(&sysctl_lock);
1429         return head;
1430 }
1431
1432 void sysctl_head_finish(struct ctl_table_header *head)
1433 {
1434         if (!head)
1435                 return;
1436         spin_lock(&sysctl_lock);
1437         unuse_table(head);
1438         spin_unlock(&sysctl_lock);
1439 }
1440
1441 static struct ctl_table_set *
1442 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1443 {
1444         struct ctl_table_set *set = &root->default_set;
1445         if (root->lookup)
1446                 set = root->lookup(root, namespaces);
1447         return set;
1448 }
1449
1450 static struct list_head *
1451 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1452 {
1453         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1454         return &set->list;
1455 }
1456
1457 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1458                                             struct ctl_table_header *prev)
1459 {
1460         struct ctl_table_root *root;
1461         struct list_head *header_list;
1462         struct ctl_table_header *head;
1463         struct list_head *tmp;
1464
1465         spin_lock(&sysctl_lock);
1466         if (prev) {
1467                 head = prev;
1468                 tmp = &prev->ctl_entry;
1469                 unuse_table(prev);
1470                 goto next;
1471         }
1472         tmp = &root_table_header.ctl_entry;
1473         for (;;) {
1474                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1475
1476                 if (!use_table(head))
1477                         goto next;
1478                 spin_unlock(&sysctl_lock);
1479                 return head;
1480         next:
1481                 root = head->root;
1482                 tmp = tmp->next;
1483                 header_list = lookup_header_list(root, namespaces);
1484                 if (tmp != header_list)
1485                         continue;
1486
1487                 do {
1488                         root = list_entry(root->root_list.next,
1489                                         struct ctl_table_root, root_list);
1490                         if (root == &sysctl_table_root)
1491                                 goto out;
1492                         header_list = lookup_header_list(root, namespaces);
1493                 } while (list_empty(header_list));
1494                 tmp = header_list->next;
1495         }
1496 out:
1497         spin_unlock(&sysctl_lock);
1498         return NULL;
1499 }
1500
1501 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1502 {
1503         return __sysctl_head_next(current->nsproxy, prev);
1504 }
1505
1506 void register_sysctl_root(struct ctl_table_root *root)
1507 {
1508         spin_lock(&sysctl_lock);
1509         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1510         spin_unlock(&sysctl_lock);
1511 }
1512
1513 #ifdef CONFIG_SYSCTL_SYSCALL
1514 /* Perform the actual read/write of a sysctl table entry. */
1515 static int do_sysctl_strategy(struct ctl_table_root *root,
1516                         struct ctl_table *table,
1517                         int __user *name, int nlen,
1518                         void __user *oldval, size_t __user *oldlenp,
1519                         void __user *newval, size_t newlen)
1520 {
1521         int op = 0, rc;
1522
1523         if (oldval)
1524                 op |= MAY_READ;
1525         if (newval)
1526                 op |= MAY_WRITE;
1527         if (sysctl_perm(root, table, op))
1528                 return -EPERM;
1529
1530         if (table->strategy) {
1531                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1532                                      newval, newlen);
1533                 if (rc < 0)
1534                         return rc;
1535                 if (rc > 0)
1536                         return 0;
1537         }
1538
1539         /* If there is no strategy routine, or if the strategy returns
1540          * zero, proceed with automatic r/w */
1541         if (table->data && table->maxlen) {
1542                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1543                                  newval, newlen);
1544                 if (rc < 0)
1545                         return rc;
1546         }
1547         return 0;
1548 }
1549
1550 static int parse_table(int __user *name, int nlen,
1551                        void __user *oldval, size_t __user *oldlenp,
1552                        void __user *newval, size_t newlen,
1553                        struct ctl_table_root *root,
1554                        struct ctl_table *table)
1555 {
1556         int n;
1557 repeat:
1558         if (!nlen)
1559                 return -ENOTDIR;
1560         if (get_user(n, name))
1561                 return -EFAULT;
1562         for ( ; table->ctl_name || table->procname; table++) {
1563                 if (!table->ctl_name)
1564                         continue;
1565                 if (n == table->ctl_name) {
1566                         int error;
1567                         if (table->child) {
1568                                 if (sysctl_perm(root, table, MAY_EXEC))
1569                                         return -EPERM;
1570                                 name++;
1571                                 nlen--;
1572                                 table = table->child;
1573                                 goto repeat;
1574                         }
1575                         error = do_sysctl_strategy(root, table, name, nlen,
1576                                                    oldval, oldlenp,
1577                                                    newval, newlen);
1578                         return error;
1579                 }
1580         }
1581         return -ENOTDIR;
1582 }
1583
1584 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1585                void __user *newval, size_t newlen)
1586 {
1587         struct ctl_table_header *head;
1588         int error = -ENOTDIR;
1589
1590         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1591                 return -ENOTDIR;
1592         if (oldval) {
1593                 int old_len;
1594                 if (!oldlenp || get_user(old_len, oldlenp))
1595                         return -EFAULT;
1596         }
1597
1598         for (head = sysctl_head_next(NULL); head;
1599                         head = sysctl_head_next(head)) {
1600                 error = parse_table(name, nlen, oldval, oldlenp,
1601                                         newval, newlen,
1602                                         head->root, head->ctl_table);
1603                 if (error != -ENOTDIR) {
1604                         sysctl_head_finish(head);
1605                         break;
1606                 }
1607         }
1608         return error;
1609 }
1610
1611 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1612 {
1613         struct __sysctl_args tmp;
1614         int error;
1615
1616         if (copy_from_user(&tmp, args, sizeof(tmp)))
1617                 return -EFAULT;
1618
1619         error = deprecated_sysctl_warning(&tmp);
1620         if (error)
1621                 goto out;
1622
1623         lock_kernel();
1624         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1625                           tmp.newval, tmp.newlen);
1626         unlock_kernel();
1627 out:
1628         return error;
1629 }
1630 #endif /* CONFIG_SYSCTL_SYSCALL */
1631
1632 /*
1633  * sysctl_perm does NOT grant the superuser all rights automatically, because
1634  * some sysctl variables are readonly even to root.
1635  */
1636
1637 static int test_perm(int mode, int op)
1638 {
1639         if (!current->euid)
1640                 mode >>= 6;
1641         else if (in_egroup_p(0))
1642                 mode >>= 3;
1643         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1644                 return 0;
1645         return -EACCES;
1646 }
1647
1648 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1649 {
1650         int error;
1651         int mode;
1652
1653         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1654         if (error)
1655                 return error;
1656
1657         if (root->permissions)
1658                 mode = root->permissions(root, current->nsproxy, table);
1659         else
1660                 mode = table->mode;
1661
1662         return test_perm(mode, op);
1663 }
1664
1665 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1666 {
1667         for (; table->ctl_name || table->procname; table++) {
1668                 table->parent = parent;
1669                 if (table->child)
1670                         sysctl_set_parent(table, table->child);
1671         }
1672 }
1673
1674 static __init int sysctl_init(void)
1675 {
1676         sysctl_set_parent(NULL, root_table);
1677 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1678         {
1679                 int err;
1680                 err = sysctl_check_table(current->nsproxy, root_table);
1681         }
1682 #endif
1683         return 0;
1684 }
1685
1686 core_initcall(sysctl_init);
1687
1688 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1689                                       struct ctl_table *table)
1690 {
1691         struct ctl_table *p;
1692         const char *s = branch->procname;
1693
1694         /* branch should have named subdirectory as its first element */
1695         if (!s || !branch->child)
1696                 return NULL;
1697
1698         /* ... and nothing else */
1699         if (branch[1].procname || branch[1].ctl_name)
1700                 return NULL;
1701
1702         /* table should contain subdirectory with the same name */
1703         for (p = table; p->procname || p->ctl_name; p++) {
1704                 if (!p->child)
1705                         continue;
1706                 if (p->procname && strcmp(p->procname, s) == 0)
1707                         return p;
1708         }
1709         return NULL;
1710 }
1711
1712 /* see if attaching q to p would be an improvement */
1713 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1714 {
1715         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1716         struct ctl_table *next;
1717         int is_better = 0;
1718         int not_in_parent = !p->attached_by;
1719
1720         while ((next = is_branch_in(by, to)) != NULL) {
1721                 if (by == q->attached_by)
1722                         is_better = 1;
1723                 if (to == p->attached_by)
1724                         not_in_parent = 1;
1725                 by = by->child;
1726                 to = next->child;
1727         }
1728
1729         if (is_better && not_in_parent) {
1730                 q->attached_by = by;
1731                 q->attached_to = to;
1732                 q->parent = p;
1733         }
1734 }
1735
1736 /**
1737  * __register_sysctl_paths - register a sysctl hierarchy
1738  * @root: List of sysctl headers to register on
1739  * @namespaces: Data to compute which lists of sysctl entries are visible
1740  * @path: The path to the directory the sysctl table is in.
1741  * @table: the top-level table structure
1742  *
1743  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1744  * array. A completely 0 filled entry terminates the table.
1745  *
1746  * The members of the &struct ctl_table structure are used as follows:
1747  *
1748  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1749  *            must be unique within that level of sysctl
1750  *
1751  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1752  *            enter a sysctl file
1753  *
1754  * data - a pointer to data for use by proc_handler
1755  *
1756  * maxlen - the maximum size in bytes of the data
1757  *
1758  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1759  *
1760  * child - a pointer to the child sysctl table if this entry is a directory, or
1761  *         %NULL.
1762  *
1763  * proc_handler - the text handler routine (described below)
1764  *
1765  * strategy - the strategy routine (described below)
1766  *
1767  * de - for internal use by the sysctl routines
1768  *
1769  * extra1, extra2 - extra pointers usable by the proc handler routines
1770  *
1771  * Leaf nodes in the sysctl tree will be represented by a single file
1772  * under /proc; non-leaf nodes will be represented by directories.
1773  *
1774  * sysctl(2) can automatically manage read and write requests through
1775  * the sysctl table.  The data and maxlen fields of the ctl_table
1776  * struct enable minimal validation of the values being written to be
1777  * performed, and the mode field allows minimal authentication.
1778  *
1779  * More sophisticated management can be enabled by the provision of a
1780  * strategy routine with the table entry.  This will be called before
1781  * any automatic read or write of the data is performed.
1782  *
1783  * The strategy routine may return
1784  *
1785  * < 0 - Error occurred (error is passed to user process)
1786  *
1787  * 0   - OK - proceed with automatic read or write.
1788  *
1789  * > 0 - OK - read or write has been done by the strategy routine, so
1790  *       return immediately.
1791  *
1792  * There must be a proc_handler routine for any terminal nodes
1793  * mirrored under /proc/sys (non-terminals are handled by a built-in
1794  * directory handler).  Several default handlers are available to
1795  * cover common cases -
1796  *
1797  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1798  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1799  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1800  *
1801  * It is the handler's job to read the input buffer from user memory
1802  * and process it. The handler should return 0 on success.
1803  *
1804  * This routine returns %NULL on a failure to register, and a pointer
1805  * to the table header on success.
1806  */
1807 struct ctl_table_header *__register_sysctl_paths(
1808         struct ctl_table_root *root,
1809         struct nsproxy *namespaces,
1810         const struct ctl_path *path, struct ctl_table *table)
1811 {
1812         struct ctl_table_header *header;
1813         struct ctl_table *new, **prevp;
1814         unsigned int n, npath;
1815         struct ctl_table_set *set;
1816
1817         /* Count the path components */
1818         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1819                 ;
1820
1821         /*
1822          * For each path component, allocate a 2-element ctl_table array.
1823          * The first array element will be filled with the sysctl entry
1824          * for this, the second will be the sentinel (ctl_name == 0).
1825          *
1826          * We allocate everything in one go so that we don't have to
1827          * worry about freeing additional memory in unregister_sysctl_table.
1828          */
1829         header = kzalloc(sizeof(struct ctl_table_header) +
1830                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1831         if (!header)
1832                 return NULL;
1833
1834         new = (struct ctl_table *) (header + 1);
1835
1836         /* Now connect the dots */
1837         prevp = &header->ctl_table;
1838         for (n = 0; n < npath; ++n, ++path) {
1839                 /* Copy the procname */
1840                 new->procname = path->procname;
1841                 new->ctl_name = path->ctl_name;
1842                 new->mode     = 0555;
1843
1844                 *prevp = new;
1845                 prevp = &new->child;
1846
1847                 new += 2;
1848         }
1849         *prevp = table;
1850         header->ctl_table_arg = table;
1851
1852         INIT_LIST_HEAD(&header->ctl_entry);
1853         header->used = 0;
1854         header->unregistering = NULL;
1855         header->root = root;
1856         sysctl_set_parent(NULL, header->ctl_table);
1857         header->count = 1;
1858 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1859         if (sysctl_check_table(namespaces, header->ctl_table)) {
1860                 kfree(header);
1861                 return NULL;
1862         }
1863 #endif
1864         spin_lock(&sysctl_lock);
1865         header->set = lookup_header_set(root, namespaces);
1866         header->attached_by = header->ctl_table;
1867         header->attached_to = root_table;
1868         header->parent = &root_table_header;
1869         for (set = header->set; set; set = set->parent) {
1870                 struct ctl_table_header *p;
1871                 list_for_each_entry(p, &set->list, ctl_entry) {
1872                         if (p->unregistering)
1873                                 continue;
1874                         try_attach(p, header);
1875                 }
1876         }
1877         header->parent->count++;
1878         list_add_tail(&header->ctl_entry, &header->set->list);
1879         spin_unlock(&sysctl_lock);
1880
1881         return header;
1882 }
1883
1884 /**
1885  * register_sysctl_table_path - register a sysctl table hierarchy
1886  * @path: The path to the directory the sysctl table is in.
1887  * @table: the top-level table structure
1888  *
1889  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1890  * array. A completely 0 filled entry terminates the table.
1891  *
1892  * See __register_sysctl_paths for more details.
1893  */
1894 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1895                                                 struct ctl_table *table)
1896 {
1897         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1898                                         path, table);
1899 }
1900
1901 /**
1902  * register_sysctl_table - register a sysctl table hierarchy
1903  * @table: the top-level table structure
1904  *
1905  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1906  * array. A completely 0 filled entry terminates the table.
1907  *
1908  * See register_sysctl_paths for more details.
1909  */
1910 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1911 {
1912         static const struct ctl_path null_path[] = { {} };
1913
1914         return register_sysctl_paths(null_path, table);
1915 }
1916
1917 /**
1918  * unregister_sysctl_table - unregister a sysctl table hierarchy
1919  * @header: the header returned from register_sysctl_table
1920  *
1921  * Unregisters the sysctl table and all children. proc entries may not
1922  * actually be removed until they are no longer used by anyone.
1923  */
1924 void unregister_sysctl_table(struct ctl_table_header * header)
1925 {
1926         might_sleep();
1927
1928         if (header == NULL)
1929                 return;
1930
1931         spin_lock(&sysctl_lock);
1932         start_unregistering(header);
1933         if (!--header->parent->count) {
1934                 WARN_ON(1);
1935                 kfree(header->parent);
1936         }
1937         if (!--header->count)
1938                 kfree(header);
1939         spin_unlock(&sysctl_lock);
1940 }
1941
1942 int sysctl_is_seen(struct ctl_table_header *p)
1943 {
1944         struct ctl_table_set *set = p->set;
1945         int res;
1946         spin_lock(&sysctl_lock);
1947         if (p->unregistering)
1948                 res = 0;
1949         else if (!set->is_seen)
1950                 res = 1;
1951         else
1952                 res = set->is_seen(set);
1953         spin_unlock(&sysctl_lock);
1954         return res;
1955 }
1956
1957 void setup_sysctl_set(struct ctl_table_set *p,
1958         struct ctl_table_set *parent,
1959         int (*is_seen)(struct ctl_table_set *))
1960 {
1961         INIT_LIST_HEAD(&p->list);
1962         p->parent = parent ? parent : &sysctl_table_root.default_set;
1963         p->is_seen = is_seen;
1964 }
1965
1966 #else /* !CONFIG_SYSCTL */
1967 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1968 {
1969         return NULL;
1970 }
1971
1972 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1973                                                     struct ctl_table *table)
1974 {
1975         return NULL;
1976 }
1977
1978 void unregister_sysctl_table(struct ctl_table_header * table)
1979 {
1980 }
1981
1982 void setup_sysctl_set(struct ctl_table_set *p,
1983         struct ctl_table_set *parent,
1984         int (*is_seen)(struct ctl_table_set *))
1985 {
1986 }
1987
1988 void sysctl_head_put(struct ctl_table_header *head)
1989 {
1990 }
1991
1992 #endif /* CONFIG_SYSCTL */
1993
1994 /*
1995  * /proc/sys support
1996  */
1997
1998 #ifdef CONFIG_PROC_SYSCTL
1999
2000 static int _proc_do_string(void* data, int maxlen, int write,
2001                            struct file *filp, void __user *buffer,
2002                            size_t *lenp, loff_t *ppos)
2003 {
2004         size_t len;
2005         char __user *p;
2006         char c;
2007
2008         if (!data || !maxlen || !*lenp) {
2009                 *lenp = 0;
2010                 return 0;
2011         }
2012
2013         if (write) {
2014                 len = 0;
2015                 p = buffer;
2016                 while (len < *lenp) {
2017                         if (get_user(c, p++))
2018                                 return -EFAULT;
2019                         if (c == 0 || c == '\n')
2020                                 break;
2021                         len++;
2022                 }
2023                 if (len >= maxlen)
2024                         len = maxlen-1;
2025                 if(copy_from_user(data, buffer, len))
2026                         return -EFAULT;
2027                 ((char *) data)[len] = 0;
2028                 *ppos += *lenp;
2029         } else {
2030                 len = strlen(data);
2031                 if (len > maxlen)
2032                         len = maxlen;
2033
2034                 if (*ppos > len) {
2035                         *lenp = 0;
2036                         return 0;
2037                 }
2038
2039                 data += *ppos;
2040                 len  -= *ppos;
2041
2042                 if (len > *lenp)
2043                         len = *lenp;
2044                 if (len)
2045                         if(copy_to_user(buffer, data, len))
2046                                 return -EFAULT;
2047                 if (len < *lenp) {
2048                         if(put_user('\n', ((char __user *) buffer) + len))
2049                                 return -EFAULT;
2050                         len++;
2051                 }
2052                 *lenp = len;
2053                 *ppos += len;
2054         }
2055         return 0;
2056 }
2057
2058 /**
2059  * proc_dostring - read a string sysctl
2060  * @table: the sysctl table
2061  * @write: %TRUE if this is a write to the sysctl file
2062  * @filp: the file structure
2063  * @buffer: the user buffer
2064  * @lenp: the size of the user buffer
2065  * @ppos: file position
2066  *
2067  * Reads/writes a string from/to the user buffer. If the kernel
2068  * buffer provided is not large enough to hold the string, the
2069  * string is truncated. The copied string is %NULL-terminated.
2070  * If the string is being read by the user process, it is copied
2071  * and a newline '\n' is added. It is truncated if the buffer is
2072  * not large enough.
2073  *
2074  * Returns 0 on success.
2075  */
2076 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2077                   void __user *buffer, size_t *lenp, loff_t *ppos)
2078 {
2079         return _proc_do_string(table->data, table->maxlen, write, filp,
2080                                buffer, lenp, ppos);
2081 }
2082
2083
2084 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2085                                  int *valp,
2086                                  int write, void *data)
2087 {
2088         if (write) {
2089                 *valp = *negp ? -*lvalp : *lvalp;
2090         } else {
2091                 int val = *valp;
2092                 if (val < 0) {
2093                         *negp = -1;
2094                         *lvalp = (unsigned long)-val;
2095                 } else {
2096                         *negp = 0;
2097                         *lvalp = (unsigned long)val;
2098                 }
2099         }
2100         return 0;
2101 }
2102
2103 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2104                   int write, struct file *filp, void __user *buffer,
2105                   size_t *lenp, loff_t *ppos,
2106                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2107                               int write, void *data),
2108                   void *data)
2109 {
2110 #define TMPBUFLEN 21
2111         int *i, vleft, first=1, neg, val;
2112         unsigned long lval;
2113         size_t left, len;
2114
2115         char buf[TMPBUFLEN], *p;
2116         char __user *s = buffer;
2117
2118         if (!tbl_data || !table->maxlen || !*lenp ||
2119             (*ppos && !write)) {
2120                 *lenp = 0;
2121                 return 0;
2122         }
2123
2124         i = (int *) tbl_data;
2125         vleft = table->maxlen / sizeof(*i);
2126         left = *lenp;
2127
2128         if (!conv)
2129                 conv = do_proc_dointvec_conv;
2130
2131         for (; left && vleft--; i++, first=0) {
2132                 if (write) {
2133                         while (left) {
2134                                 char c;
2135                                 if (get_user(c, s))
2136                                         return -EFAULT;
2137                                 if (!isspace(c))
2138                                         break;
2139                                 left--;
2140                                 s++;
2141                         }
2142                         if (!left)
2143                                 break;
2144                         neg = 0;
2145                         len = left;
2146                         if (len > sizeof(buf) - 1)
2147                                 len = sizeof(buf) - 1;
2148                         if (copy_from_user(buf, s, len))
2149                                 return -EFAULT;
2150                         buf[len] = 0;
2151                         p = buf;
2152                         if (*p == '-' && left > 1) {
2153                                 neg = 1;
2154                                 p++;
2155                         }
2156                         if (*p < '0' || *p > '9')
2157                                 break;
2158
2159                         lval = simple_strtoul(p, &p, 0);
2160
2161                         len = p-buf;
2162                         if ((len < left) && *p && !isspace(*p))
2163                                 break;
2164                         if (neg)
2165                                 val = -val;
2166                         s += len;
2167                         left -= len;
2168
2169                         if (conv(&neg, &lval, i, 1, data))
2170                                 break;
2171                 } else {
2172                         p = buf;
2173                         if (!first)
2174                                 *p++ = '\t';
2175
2176                         if (conv(&neg, &lval, i, 0, data))
2177                                 break;
2178
2179                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2180                         len = strlen(buf);
2181                         if (len > left)
2182                                 len = left;
2183                         if(copy_to_user(s, buf, len))
2184                                 return -EFAULT;
2185                         left -= len;
2186                         s += len;
2187                 }
2188         }
2189
2190         if (!write && !first && left) {
2191                 if(put_user('\n', s))
2192                         return -EFAULT;
2193                 left--, s++;
2194         }
2195         if (write) {
2196                 while (left) {
2197                         char c;
2198                         if (get_user(c, s++))
2199                                 return -EFAULT;
2200                         if (!isspace(c))
2201                                 break;
2202                         left--;
2203                 }
2204         }
2205         if (write && first)
2206                 return -EINVAL;
2207         *lenp -= left;
2208         *ppos += *lenp;
2209         return 0;
2210 #undef TMPBUFLEN
2211 }
2212
2213 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2214                   void __user *buffer, size_t *lenp, loff_t *ppos,
2215                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2216                               int write, void *data),
2217                   void *data)
2218 {
2219         return __do_proc_dointvec(table->data, table, write, filp,
2220                         buffer, lenp, ppos, conv, data);
2221 }
2222
2223 /**
2224  * proc_dointvec - read a vector of integers
2225  * @table: the sysctl table
2226  * @write: %TRUE if this is a write to the sysctl file
2227  * @filp: the file structure
2228  * @buffer: the user buffer
2229  * @lenp: the size of the user buffer
2230  * @ppos: file position
2231  *
2232  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2233  * values from/to the user buffer, treated as an ASCII string.
2234  *
2235  * Returns 0 on success.
2236  */
2237 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2238                      void __user *buffer, size_t *lenp, loff_t *ppos)
2239 {
2240     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2241                             NULL,NULL);
2242 }
2243
2244 #define OP_SET  0
2245 #define OP_AND  1
2246 #define OP_OR   2
2247
2248 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2249                                       int *valp,
2250                                       int write, void *data)
2251 {
2252         int op = *(int *)data;
2253         if (write) {
2254                 int val = *negp ? -*lvalp : *lvalp;
2255                 switch(op) {
2256                 case OP_SET:    *valp = val; break;
2257                 case OP_AND:    *valp &= val; break;
2258                 case OP_OR:     *valp |= val; break;
2259                 }
2260         } else {
2261                 int val = *valp;
2262                 if (val < 0) {
2263                         *negp = -1;
2264                         *lvalp = (unsigned long)-val;
2265                 } else {
2266                         *negp = 0;
2267                         *lvalp = (unsigned long)val;
2268                 }
2269         }
2270         return 0;
2271 }
2272
2273 /*
2274  *      Taint values can only be increased
2275  */
2276 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2277                                void __user *buffer, size_t *lenp, loff_t *ppos)
2278 {
2279         int op;
2280
2281         if (write && !capable(CAP_SYS_ADMIN))
2282                 return -EPERM;
2283
2284         op = OP_OR;
2285         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2286                                 do_proc_dointvec_bset_conv,&op);
2287 }
2288
2289 struct do_proc_dointvec_minmax_conv_param {
2290         int *min;
2291         int *max;
2292 };
2293
2294 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2295                                         int *valp,
2296                                         int write, void *data)
2297 {
2298         struct do_proc_dointvec_minmax_conv_param *param = data;
2299         if (write) {
2300                 int val = *negp ? -*lvalp : *lvalp;
2301                 if ((param->min && *param->min > val) ||
2302                     (param->max && *param->max < val))
2303                         return -EINVAL;
2304                 *valp = val;
2305         } else {
2306                 int val = *valp;
2307                 if (val < 0) {
2308                         *negp = -1;
2309                         *lvalp = (unsigned long)-val;
2310                 } else {
2311                         *negp = 0;
2312                         *lvalp = (unsigned long)val;
2313                 }
2314         }
2315         return 0;
2316 }
2317
2318 /**
2319  * proc_dointvec_minmax - read a vector of integers with min/max values
2320  * @table: the sysctl table
2321  * @write: %TRUE if this is a write to the sysctl file
2322  * @filp: the file structure
2323  * @buffer: the user buffer
2324  * @lenp: the size of the user buffer
2325  * @ppos: file position
2326  *
2327  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2328  * values from/to the user buffer, treated as an ASCII string.
2329  *
2330  * This routine will ensure the values are within the range specified by
2331  * table->extra1 (min) and table->extra2 (max).
2332  *
2333  * Returns 0 on success.
2334  */
2335 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2336                   void __user *buffer, size_t *lenp, loff_t *ppos)
2337 {
2338         struct do_proc_dointvec_minmax_conv_param param = {
2339                 .min = (int *) table->extra1,
2340                 .max = (int *) table->extra2,
2341         };
2342         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2343                                 do_proc_dointvec_minmax_conv, &param);
2344 }
2345
2346 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2347                                      struct file *filp,
2348                                      void __user *buffer,
2349                                      size_t *lenp, loff_t *ppos,
2350                                      unsigned long convmul,
2351                                      unsigned long convdiv)
2352 {
2353 #define TMPBUFLEN 21
2354         unsigned long *i, *min, *max, val;
2355         int vleft, first=1, neg;
2356         size_t len, left;
2357         char buf[TMPBUFLEN], *p;
2358         char __user *s = buffer;
2359
2360         if (!data || !table->maxlen || !*lenp ||
2361             (*ppos && !write)) {
2362                 *lenp = 0;
2363                 return 0;
2364         }
2365
2366         i = (unsigned long *) data;
2367         min = (unsigned long *) table->extra1;
2368         max = (unsigned long *) table->extra2;
2369         vleft = table->maxlen / sizeof(unsigned long);
2370         left = *lenp;
2371
2372         for (; left && vleft--; i++, min++, max++, first=0) {
2373                 if (write) {
2374                         while (left) {
2375                                 char c;
2376                                 if (get_user(c, s))
2377                                         return -EFAULT;
2378                                 if (!isspace(c))
2379                                         break;
2380                                 left--;
2381                                 s++;
2382                         }
2383                         if (!left)
2384                                 break;
2385                         neg = 0;
2386                         len = left;
2387                         if (len > TMPBUFLEN-1)
2388                                 len = TMPBUFLEN-1;
2389                         if (copy_from_user(buf, s, len))
2390                                 return -EFAULT;
2391                         buf[len] = 0;
2392                         p = buf;
2393                         if (*p == '-' && left > 1) {
2394                                 neg = 1;
2395                                 p++;
2396                         }
2397                         if (*p < '0' || *p > '9')
2398                                 break;
2399                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2400                         len = p-buf;
2401                         if ((len < left) && *p && !isspace(*p))
2402                                 break;
2403                         if (neg)
2404                                 val = -val;
2405                         s += len;
2406                         left -= len;
2407
2408                         if(neg)
2409                                 continue;
2410                         if ((min && val < *min) || (max && val > *max))
2411                                 continue;
2412                         *i = val;
2413                 } else {
2414                         p = buf;
2415                         if (!first)
2416                                 *p++ = '\t';
2417                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2418                         len = strlen(buf);
2419                         if (len > left)
2420                                 len = left;
2421                         if(copy_to_user(s, buf, len))
2422                                 return -EFAULT;
2423                         left -= len;
2424                         s += len;
2425                 }
2426         }
2427
2428         if (!write && !first && left) {
2429                 if(put_user('\n', s))
2430                         return -EFAULT;
2431                 left--, s++;
2432         }
2433         if (write) {
2434                 while (left) {
2435                         char c;
2436                         if (get_user(c, s++))
2437                                 return -EFAULT;
2438                         if (!isspace(c))
2439                                 break;
2440                         left--;
2441                 }
2442         }
2443         if (write && first)
2444                 return -EINVAL;
2445         *lenp -= left;
2446         *ppos += *lenp;
2447         return 0;
2448 #undef TMPBUFLEN
2449 }
2450
2451 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2452                                      struct file *filp,
2453                                      void __user *buffer,
2454                                      size_t *lenp, loff_t *ppos,
2455                                      unsigned long convmul,
2456                                      unsigned long convdiv)
2457 {
2458         return __do_proc_doulongvec_minmax(table->data, table, write,
2459                         filp, buffer, lenp, ppos, convmul, convdiv);
2460 }
2461
2462 /**
2463  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2464  * @table: the sysctl table
2465  * @write: %TRUE if this is a write to the sysctl file
2466  * @filp: the file structure
2467  * @buffer: the user buffer
2468  * @lenp: the size of the user buffer
2469  * @ppos: file position
2470  *
2471  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2472  * values from/to the user buffer, treated as an ASCII string.
2473  *
2474  * This routine will ensure the values are within the range specified by
2475  * table->extra1 (min) and table->extra2 (max).
2476  *
2477  * Returns 0 on success.
2478  */
2479 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2480                            void __user *buffer, size_t *lenp, loff_t *ppos)
2481 {
2482     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2483 }
2484
2485 /**
2486  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2487  * @table: the sysctl table
2488  * @write: %TRUE if this is a write to the sysctl file
2489  * @filp: the file structure
2490  * @buffer: the user buffer
2491  * @lenp: the size of the user buffer
2492  * @ppos: file position
2493  *
2494  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2495  * values from/to the user buffer, treated as an ASCII string. The values
2496  * are treated as milliseconds, and converted to jiffies when they are stored.
2497  *
2498  * This routine will ensure the values are within the range specified by
2499  * table->extra1 (min) and table->extra2 (max).
2500  *
2501  * Returns 0 on success.
2502  */
2503 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2504                                       struct file *filp,
2505                                       void __user *buffer,
2506                                       size_t *lenp, loff_t *ppos)
2507 {
2508     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2509                                      lenp, ppos, HZ, 1000l);
2510 }
2511
2512
2513 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2514                                          int *valp,
2515                                          int write, void *data)
2516 {
2517         if (write) {
2518                 if (*lvalp > LONG_MAX / HZ)
2519                         return 1;
2520                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2521         } else {
2522                 int val = *valp;
2523                 unsigned long lval;
2524                 if (val < 0) {
2525                         *negp = -1;
2526                         lval = (unsigned long)-val;
2527                 } else {
2528                         *negp = 0;
2529                         lval = (unsigned long)val;
2530                 }
2531                 *lvalp = lval / HZ;
2532         }
2533         return 0;
2534 }
2535
2536 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2537                                                 int *valp,
2538                                                 int write, void *data)
2539 {
2540         if (write) {
2541                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2542                         return 1;
2543                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2544         } else {
2545                 int val = *valp;
2546                 unsigned long lval;
2547                 if (val < 0) {
2548                         *negp = -1;
2549                         lval = (unsigned long)-val;
2550                 } else {
2551                         *negp = 0;
2552                         lval = (unsigned long)val;
2553                 }
2554                 *lvalp = jiffies_to_clock_t(lval);
2555         }
2556         return 0;
2557 }
2558
2559 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2560                                             int *valp,
2561                                             int write, void *data)
2562 {
2563         if (write) {
2564                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2565         } else {
2566                 int val = *valp;
2567                 unsigned long lval;
2568                 if (val < 0) {
2569                         *negp = -1;
2570                         lval = (unsigned long)-val;
2571                 } else {
2572                         *negp = 0;
2573                         lval = (unsigned long)val;
2574                 }
2575                 *lvalp = jiffies_to_msecs(lval);
2576         }
2577         return 0;
2578 }
2579
2580 /**
2581  * proc_dointvec_jiffies - read a vector of integers as seconds
2582  * @table: the sysctl table
2583  * @write: %TRUE if this is a write to the sysctl file
2584  * @filp: the file structure
2585  * @buffer: the user buffer
2586  * @lenp: the size of the user buffer
2587  * @ppos: file position
2588  *
2589  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2590  * values from/to the user buffer, treated as an ASCII string.
2591  * The values read are assumed to be in seconds, and are converted into
2592  * jiffies.
2593  *
2594  * Returns 0 on success.
2595  */
2596 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2597                           void __user *buffer, size_t *lenp, loff_t *ppos)
2598 {
2599     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2600                             do_proc_dointvec_jiffies_conv,NULL);
2601 }
2602
2603 /**
2604  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2605  * @table: the sysctl table
2606  * @write: %TRUE if this is a write to the sysctl file
2607  * @filp: the file structure
2608  * @buffer: the user buffer
2609  * @lenp: the size of the user buffer
2610  * @ppos: pointer to the file position
2611  *
2612  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2613  * values from/to the user buffer, treated as an ASCII string.
2614  * The values read are assumed to be in 1/USER_HZ seconds, and
2615  * are converted into jiffies.
2616  *
2617  * Returns 0 on success.
2618  */
2619 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2620                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2621 {
2622     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2623                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2624 }
2625
2626 /**
2627  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2628  * @table: the sysctl table
2629  * @write: %TRUE if this is a write to the sysctl file
2630  * @filp: the file structure
2631  * @buffer: the user buffer
2632  * @lenp: the size of the user buffer
2633  * @ppos: file position
2634  * @ppos: the current position in the file
2635  *
2636  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2637  * values from/to the user buffer, treated as an ASCII string.
2638  * The values read are assumed to be in 1/1000 seconds, and
2639  * are converted into jiffies.
2640  *
2641  * Returns 0 on success.
2642  */
2643 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2644                              void __user *buffer, size_t *lenp, loff_t *ppos)
2645 {
2646         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2647                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2648 }
2649
2650 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2651                            void __user *buffer, size_t *lenp, loff_t *ppos)
2652 {
2653         struct pid *new_pid;
2654         pid_t tmp;
2655         int r;
2656
2657         tmp = pid_vnr(cad_pid);
2658
2659         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2660                                lenp, ppos, NULL, NULL);
2661         if (r || !write)
2662                 return r;
2663
2664         new_pid = find_get_pid(tmp);
2665         if (!new_pid)
2666                 return -ESRCH;
2667
2668         put_pid(xchg(&cad_pid, new_pid));
2669         return 0;
2670 }
2671
2672 #else /* CONFIG_PROC_FS */
2673
2674 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2675                   void __user *buffer, size_t *lenp, loff_t *ppos)
2676 {
2677         return -ENOSYS;
2678 }
2679
2680 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2681                   void __user *buffer, size_t *lenp, loff_t *ppos)
2682 {
2683         return -ENOSYS;
2684 }
2685
2686 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2687                     void __user *buffer, size_t *lenp, loff_t *ppos)
2688 {
2689         return -ENOSYS;
2690 }
2691
2692 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2693                     void __user *buffer, size_t *lenp, loff_t *ppos)
2694 {
2695         return -ENOSYS;
2696 }
2697
2698 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2699                     void __user *buffer, size_t *lenp, loff_t *ppos)
2700 {
2701         return -ENOSYS;
2702 }
2703
2704 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2705                              void __user *buffer, size_t *lenp, loff_t *ppos)
2706 {
2707         return -ENOSYS;
2708 }
2709
2710 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2711                     void __user *buffer, size_t *lenp, loff_t *ppos)
2712 {
2713         return -ENOSYS;
2714 }
2715
2716 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2717                                       struct file *filp,
2718                                       void __user *buffer,
2719                                       size_t *lenp, loff_t *ppos)
2720 {
2721     return -ENOSYS;
2722 }
2723
2724
2725 #endif /* CONFIG_PROC_FS */
2726
2727
2728 #ifdef CONFIG_SYSCTL_SYSCALL
2729 /*
2730  * General sysctl support routines
2731  */
2732
2733 /* The generic sysctl data routine (used if no strategy routine supplied) */
2734 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2735                 void __user *oldval, size_t __user *oldlenp,
2736                 void __user *newval, size_t newlen)
2737 {
2738         size_t len;
2739
2740         /* Get out of I don't have a variable */
2741         if (!table->data || !table->maxlen)
2742                 return -ENOTDIR;
2743
2744         if (oldval && oldlenp) {
2745                 if (get_user(len, oldlenp))
2746                         return -EFAULT;
2747                 if (len) {
2748                         if (len > table->maxlen)
2749                                 len = table->maxlen;
2750                         if (copy_to_user(oldval, table->data, len))
2751                                 return -EFAULT;
2752                         if (put_user(len, oldlenp))
2753                                 return -EFAULT;
2754                 }
2755         }
2756
2757         if (newval && newlen) {
2758                 if (newlen > table->maxlen)
2759                         newlen = table->maxlen;
2760
2761                 if (copy_from_user(table->data, newval, newlen))
2762                         return -EFAULT;
2763         }
2764         return 1;
2765 }
2766
2767 /* The generic string strategy routine: */
2768 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2769                   void __user *oldval, size_t __user *oldlenp,
2770                   void __user *newval, size_t newlen)
2771 {
2772         if (!table->data || !table->maxlen)
2773                 return -ENOTDIR;
2774
2775         if (oldval && oldlenp) {
2776                 size_t bufsize;
2777                 if (get_user(bufsize, oldlenp))
2778                         return -EFAULT;
2779                 if (bufsize) {
2780                         size_t len = strlen(table->data), copied;
2781
2782                         /* This shouldn't trigger for a well-formed sysctl */
2783                         if (len > table->maxlen)
2784                                 len = table->maxlen;
2785
2786                         /* Copy up to a max of bufsize-1 bytes of the string */
2787                         copied = (len >= bufsize) ? bufsize - 1 : len;
2788
2789                         if (copy_to_user(oldval, table->data, copied) ||
2790                             put_user(0, (char __user *)(oldval + copied)))
2791                                 return -EFAULT;
2792                         if (put_user(len, oldlenp))
2793                                 return -EFAULT;
2794                 }
2795         }
2796         if (newval && newlen) {
2797                 size_t len = newlen;
2798                 if (len > table->maxlen)
2799                         len = table->maxlen;
2800                 if(copy_from_user(table->data, newval, len))
2801                         return -EFAULT;
2802                 if (len == table->maxlen)
2803                         len--;
2804                 ((char *) table->data)[len] = 0;
2805         }
2806         return 1;
2807 }
2808
2809 /*
2810  * This function makes sure that all of the integers in the vector
2811  * are between the minimum and maximum values given in the arrays
2812  * table->extra1 and table->extra2, respectively.
2813  */
2814 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2815                 void __user *oldval, size_t __user *oldlenp,
2816                 void __user *newval, size_t newlen)
2817 {
2818
2819         if (newval && newlen) {
2820                 int __user *vec = (int __user *) newval;
2821                 int *min = (int *) table->extra1;
2822                 int *max = (int *) table->extra2;
2823                 size_t length;
2824                 int i;
2825
2826                 if (newlen % sizeof(int) != 0)
2827                         return -EINVAL;
2828
2829                 if (!table->extra1 && !table->extra2)
2830                         return 0;
2831
2832                 if (newlen > table->maxlen)
2833                         newlen = table->maxlen;
2834                 length = newlen / sizeof(int);
2835
2836                 for (i = 0; i < length; i++) {
2837                         int value;
2838                         if (get_user(value, vec + i))
2839                                 return -EFAULT;
2840                         if (min && value < min[i])
2841                                 return -EINVAL;
2842                         if (max && value > max[i])
2843                                 return -EINVAL;
2844                 }
2845         }
2846         return 0;
2847 }
2848
2849 /* Strategy function to convert jiffies to seconds */
2850 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2851                 void __user *oldval, size_t __user *oldlenp,
2852                 void __user *newval, size_t newlen)
2853 {
2854         if (oldval && oldlenp) {
2855                 size_t olen;
2856
2857                 if (get_user(olen, oldlenp))
2858                         return -EFAULT;
2859                 if (olen) {
2860                         int val;
2861
2862                         if (olen < sizeof(int))
2863                                 return -EINVAL;
2864
2865                         val = *(int *)(table->data) / HZ;
2866                         if (put_user(val, (int __user *)oldval))
2867                                 return -EFAULT;
2868                         if (put_user(sizeof(int), oldlenp))
2869                                 return -EFAULT;
2870                 }
2871         }
2872         if (newval && newlen) {
2873                 int new;
2874                 if (newlen != sizeof(int))
2875                         return -EINVAL;
2876                 if (get_user(new, (int __user *)newval))
2877                         return -EFAULT;
2878                 *(int *)(table->data) = new*HZ;
2879         }
2880         return 1;
2881 }
2882
2883 /* Strategy function to convert jiffies to seconds */
2884 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2885                 void __user *oldval, size_t __user *oldlenp,
2886                 void __user *newval, size_t newlen)
2887 {
2888         if (oldval && oldlenp) {
2889                 size_t olen;
2890
2891                 if (get_user(olen, oldlenp))
2892                         return -EFAULT;
2893                 if (olen) {
2894                         int val;
2895
2896                         if (olen < sizeof(int))
2897                                 return -EINVAL;
2898
2899                         val = jiffies_to_msecs(*(int *)(table->data));
2900                         if (put_user(val, (int __user *)oldval))
2901                                 return -EFAULT;
2902                         if (put_user(sizeof(int), oldlenp))
2903                                 return -EFAULT;
2904                 }
2905         }
2906         if (newval && newlen) {
2907                 int new;
2908                 if (newlen != sizeof(int))
2909                         return -EINVAL;
2910                 if (get_user(new, (int __user *)newval))
2911                         return -EFAULT;
2912                 *(int *)(table->data) = msecs_to_jiffies(new);
2913         }
2914         return 1;
2915 }
2916
2917
2918
2919 #else /* CONFIG_SYSCTL_SYSCALL */
2920
2921
2922 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2923 {
2924         struct __sysctl_args tmp;
2925         int error;
2926
2927         if (copy_from_user(&tmp, args, sizeof(tmp)))
2928                 return -EFAULT;
2929
2930         error = deprecated_sysctl_warning(&tmp);
2931
2932         /* If no error reading the parameters then just -ENOSYS ... */
2933         if (!error)
2934                 error = -ENOSYS;
2935
2936         return error;
2937 }
2938
2939 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2940                   void __user *oldval, size_t __user *oldlenp,
2941                   void __user *newval, size_t newlen)
2942 {
2943         return -ENOSYS;
2944 }
2945
2946 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2947                   void __user *oldval, size_t __user *oldlenp,
2948                   void __user *newval, size_t newlen)
2949 {
2950         return -ENOSYS;
2951 }
2952
2953 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2954                 void __user *oldval, size_t __user *oldlenp,
2955                 void __user *newval, size_t newlen)
2956 {
2957         return -ENOSYS;
2958 }
2959
2960 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2961                 void __user *oldval, size_t __user *oldlenp,
2962                 void __user *newval, size_t newlen)
2963 {
2964         return -ENOSYS;
2965 }
2966
2967 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2968                 void __user *oldval, size_t __user *oldlenp,
2969                 void __user *newval, size_t newlen)
2970 {
2971         return -ENOSYS;
2972 }
2973
2974 #endif /* CONFIG_SYSCTL_SYSCALL */
2975
2976 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2977 {
2978         static int msg_count;
2979         int name[CTL_MAXNAME];
2980         int i;
2981
2982         /* Check args->nlen. */
2983         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2984                 return -ENOTDIR;
2985
2986         /* Read in the sysctl name for better debug message logging */
2987         for (i = 0; i < args->nlen; i++)
2988                 if (get_user(name[i], args->name + i))
2989                         return -EFAULT;
2990
2991         /* Ignore accesses to kernel.version */
2992         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2993                 return 0;
2994
2995         if (msg_count < 5) {
2996                 msg_count++;
2997                 printk(KERN_INFO
2998                         "warning: process `%s' used the deprecated sysctl "
2999                         "system call with ", current->comm);
3000                 for (i = 0; i < args->nlen; i++)
3001                         printk("%d.", name[i]);
3002                 printk("\n");
3003         }
3004         return 0;
3005 }
3006
3007 /*
3008  * No sense putting this after each symbol definition, twice,
3009  * exception granted :-)
3010  */
3011 EXPORT_SYMBOL(proc_dointvec);
3012 EXPORT_SYMBOL(proc_dointvec_jiffies);
3013 EXPORT_SYMBOL(proc_dointvec_minmax);
3014 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3015 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3016 EXPORT_SYMBOL(proc_dostring);
3017 EXPORT_SYMBOL(proc_doulongvec_minmax);
3018 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3019 EXPORT_SYMBOL(register_sysctl_table);
3020 EXPORT_SYMBOL(register_sysctl_paths);
3021 EXPORT_SYMBOL(sysctl_intvec);
3022 EXPORT_SYMBOL(sysctl_jiffies);
3023 EXPORT_SYMBOL(sysctl_ms_jiffies);
3024 EXPORT_SYMBOL(sysctl_string);
3025 EXPORT_SYMBOL(sysctl_data);
3026 EXPORT_SYMBOL(unregister_sysctl_table);