git.oblomov.eu Git - linux-2.6/blob - kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/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 latencytop_enabled;
  84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  85 #ifdef CONFIG_RCU_TORTURE_TEST
  86 extern int rcutorture_runnable;
  87 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
  88
  89 /* Constants used for minimum and  maximum */
  90 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
  91 static int one = 1;
  92 #endif
  93
  94 #ifdef CONFIG_DETECT_SOFTLOCKUP
  95 static int sixty = 60;
  96 static int neg_one = -1;
  97 #endif
  98
  99 #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
 100 static int two = 2;
 101 #endif
 102
 103 static int zero;
 104 static int one_hundred = 100;
 105
 106 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 107 static int maxolduid = 65535;
 108 static int minolduid;
 109 static int min_percpu_pagelist_fract = 8;
 110
 111 static int ngroups_max = NGROUPS_MAX;
 112
 113 #ifdef CONFIG_MODULES
 114 extern char modprobe_path[];
 115 #endif
 116 #ifdef CONFIG_CHR_DEV_SG
 117 extern int sg_big_buff;
 118 #endif
 119
 120 #ifdef CONFIG_SPARC
 121 #include <asm/system.h>
 122 #endif
 123
 124 #ifdef __hppa__
 125 extern int pwrsw_enabled;
 126 extern int unaligned_enabled;
 127 #endif
 128
 129 #ifdef CONFIG_S390
 130 #ifdef CONFIG_MATHEMU
 131 extern int sysctl_ieee_emulation_warnings;
 132 #endif
 133 extern int sysctl_userprocess_debug;
 134 extern int spin_retry;
 135 #endif
 136
 137 #ifdef CONFIG_BSD_PROCESS_ACCT
 138 extern int acct_parm[];
 139 #endif
 140
 141 #ifdef CONFIG_IA64
 142 extern int no_unaligned_warning;
 143 #endif
 144
 145 #ifdef CONFIG_RT_MUTEXES
 146 extern int max_lock_depth;
 147 #endif
 148
 149 #ifdef CONFIG_PROC_SYSCTL
 150 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 151                   void __user *buffer, size_t *lenp, loff_t *ppos);
 152 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
 153                                void __user *buffer, size_t *lenp, loff_t *ppos);
 154 #endif
 155
 156 static struct ctl_table root_table[];
 157 static struct ctl_table_root sysctl_table_root;
 158 static struct ctl_table_header root_table_header = {
 159         .count = 1,
 160         .ctl_table = root_table,
 161         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
 162         .root = &sysctl_table_root,
 163         .set = &sysctl_table_root.default_set,
 164 };
 165 static struct ctl_table_root sysctl_table_root = {
 166         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 167         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 168 };
 169
 170 static struct ctl_table kern_table[];
 171 static struct ctl_table vm_table[];
 172 static struct ctl_table fs_table[];
 173 static struct ctl_table debug_table[];
 174 static struct ctl_table dev_table[];
 175 extern struct ctl_table random_table[];
 176 #ifdef CONFIG_INOTIFY_USER
 177 extern struct ctl_table inotify_table[];
 178 #endif
 179 #ifdef CONFIG_EPOLL
 180 extern struct ctl_table epoll_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_shares_thresh",
 283                 .data           = &sysctl_sched_shares_thresh,
 284                 .maxlen         = sizeof(unsigned int),
 285                 .mode           = 0644,
 286                 .proc_handler   = &proc_dointvec_minmax,
 287                 .strategy       = &sysctl_intvec,
 288                 .extra1         = &zero,
 289         },
 290         {
 291                 .ctl_name       = CTL_UNNUMBERED,
 292                 .procname       = "sched_child_runs_first",
 293                 .data           = &sysctl_sched_child_runs_first,
 294                 .maxlen         = sizeof(unsigned int),
 295                 .mode           = 0644,
 296                 .proc_handler   = &proc_dointvec,
 297         },
 298         {
 299                 .ctl_name       = CTL_UNNUMBERED,
 300                 .procname       = "sched_features",
 301                 .data           = &sysctl_sched_features,
 302                 .maxlen         = sizeof(unsigned int),
 303                 .mode           = 0644,
 304                 .proc_handler   = &proc_dointvec,
 305         },
 306         {
 307                 .ctl_name       = CTL_UNNUMBERED,
 308                 .procname       = "sched_migration_cost",
 309                 .data           = &sysctl_sched_migration_cost,
 310                 .maxlen         = sizeof(unsigned int),
 311                 .mode           = 0644,
 312                 .proc_handler   = &proc_dointvec,
 313         },
 314         {
 315                 .ctl_name       = CTL_UNNUMBERED,
 316                 .procname       = "sched_nr_migrate",
 317                 .data           = &sysctl_sched_nr_migrate,
 318                 .maxlen         = sizeof(unsigned int),
 319                 .mode           = 0644,
 320                 .proc_handler   = &proc_dointvec,
 321         },
 322 #endif
 323         {
 324                 .ctl_name       = CTL_UNNUMBERED,
 325                 .procname       = "sched_rt_period_us",
 326                 .data           = &sysctl_sched_rt_period,
 327                 .maxlen         = sizeof(unsigned int),
 328                 .mode           = 0644,
 329                 .proc_handler   = &sched_rt_handler,
 330         },
 331         {
 332                 .ctl_name       = CTL_UNNUMBERED,
 333                 .procname       = "sched_rt_runtime_us",
 334                 .data           = &sysctl_sched_rt_runtime,
 335                 .maxlen         = sizeof(int),
 336                 .mode           = 0644,
 337                 .proc_handler   = &sched_rt_handler,
 338         },
 339         {
 340                 .ctl_name       = CTL_UNNUMBERED,
 341                 .procname       = "sched_compat_yield",
 342                 .data           = &sysctl_sched_compat_yield,
 343                 .maxlen         = sizeof(unsigned int),
 344                 .mode           = 0644,
 345                 .proc_handler   = &proc_dointvec,
 346         },
 347 #ifdef CONFIG_PROVE_LOCKING
 348         {
 349                 .ctl_name       = CTL_UNNUMBERED,
 350                 .procname       = "prove_locking",
 351                 .data           = &prove_locking,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = &proc_dointvec,
 355         },
 356 #endif
 357 #ifdef CONFIG_LOCK_STAT
 358         {
 359                 .ctl_name       = CTL_UNNUMBERED,
 360                 .procname       = "lock_stat",
 361                 .data           = &lock_stat,
 362                 .maxlen         = sizeof(int),
 363                 .mode           = 0644,
 364                 .proc_handler   = &proc_dointvec,
 365         },
 366 #endif
 367         {
 368                 .ctl_name       = KERN_PANIC,
 369                 .procname       = "panic",
 370                 .data           = &panic_timeout,
 371                 .maxlen         = sizeof(int),
 372                 .mode           = 0644,
 373                 .proc_handler   = &proc_dointvec,
 374         },
 375         {
 376                 .ctl_name       = KERN_CORE_USES_PID,
 377                 .procname       = "core_uses_pid",
 378                 .data           = &core_uses_pid,
 379                 .maxlen         = sizeof(int),
 380                 .mode           = 0644,
 381                 .proc_handler   = &proc_dointvec,
 382         },
 383         {
 384                 .ctl_name       = KERN_CORE_PATTERN,
 385                 .procname       = "core_pattern",
 386                 .data           = core_pattern,
 387                 .maxlen         = CORENAME_MAX_SIZE,
 388                 .mode           = 0644,
 389                 .proc_handler   = &proc_dostring,
 390                 .strategy       = &sysctl_string,
 391         },
 392 #ifdef CONFIG_PROC_SYSCTL
 393         {
 394                 .procname       = "tainted",
 395                 .maxlen         = sizeof(long),
 396                 .mode           = 0644,
 397                 .proc_handler   = &proc_taint,
 398         },
 399 #endif
 400 #ifdef CONFIG_LATENCYTOP
 401         {
 402                 .procname       = "latencytop",
 403                 .data           = &latencytop_enabled,
 404                 .maxlen         = sizeof(int),
 405                 .mode           = 0644,
 406                 .proc_handler   = &proc_dointvec,
 407         },
 408 #endif
 409 #ifdef CONFIG_BLK_DEV_INITRD
 410         {
 411                 .ctl_name       = KERN_REALROOTDEV,
 412                 .procname       = "real-root-dev",
 413                 .data           = &real_root_dev,
 414                 .maxlen         = sizeof(int),
 415                 .mode           = 0644,
 416                 .proc_handler   = &proc_dointvec,
 417         },
 418 #endif
 419         {
 420                 .ctl_name       = CTL_UNNUMBERED,
 421                 .procname       = "print-fatal-signals",
 422                 .data           = &print_fatal_signals,
 423                 .maxlen         = sizeof(int),
 424                 .mode           = 0644,
 425                 .proc_handler   = &proc_dointvec,
 426         },
 427 #ifdef CONFIG_SPARC
 428         {
 429                 .ctl_name       = KERN_SPARC_REBOOT,
 430                 .procname       = "reboot-cmd",
 431                 .data           = reboot_command,
 432                 .maxlen         = 256,
 433                 .mode           = 0644,
 434                 .proc_handler   = &proc_dostring,
 435                 .strategy       = &sysctl_string,
 436         },
 437         {
 438                 .ctl_name       = KERN_SPARC_STOP_A,
 439                 .procname       = "stop-a",
 440                 .data           = &stop_a_enabled,
 441                 .maxlen         = sizeof (int),
 442                 .mode           = 0644,
 443                 .proc_handler   = &proc_dointvec,
 444         },
 445         {
 446                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 447                 .procname       = "scons-poweroff",
 448                 .data           = &scons_pwroff,
 449                 .maxlen         = sizeof (int),
 450                 .mode           = 0644,
 451                 .proc_handler   = &proc_dointvec,
 452         },
 453 #endif
 454 #ifdef __hppa__
 455         {
 456                 .ctl_name       = KERN_HPPA_PWRSW,
 457                 .procname       = "soft-power",
 458                 .data           = &pwrsw_enabled,
 459                 .maxlen         = sizeof (int),
 460                 .mode           = 0644,
 461                 .proc_handler   = &proc_dointvec,
 462         },
 463         {
 464                 .ctl_name       = KERN_HPPA_UNALIGNED,
 465                 .procname       = "unaligned-trap",
 466                 .data           = &unaligned_enabled,
 467                 .maxlen         = sizeof (int),
 468                 .mode           = 0644,
 469                 .proc_handler   = &proc_dointvec,
 470         },
 471 #endif
 472         {
 473                 .ctl_name       = KERN_CTLALTDEL,
 474                 .procname       = "ctrl-alt-del",
 475                 .data           = &C_A_D,
 476                 .maxlen         = sizeof(int),
 477                 .mode           = 0644,
 478                 .proc_handler   = &proc_dointvec,
 479         },
 480 #ifdef CONFIG_FUNCTION_TRACER
 481         {
 482                 .ctl_name       = CTL_UNNUMBERED,
 483                 .procname       = "ftrace_enabled",
 484                 .data           = &ftrace_enabled,
 485                 .maxlen         = sizeof(int),
 486                 .mode           = 0644,
 487                 .proc_handler   = &ftrace_enable_sysctl,
 488         },
 489 #endif
 490 #ifdef CONFIG_STACK_TRACER
 491         {
 492                 .ctl_name       = CTL_UNNUMBERED,
 493                 .procname       = "stack_tracer_enabled",
 494                 .data           = &stack_tracer_enabled,
 495                 .maxlen         = sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = &stack_trace_sysctl,
 498         },
 499 #endif
 500 #ifdef CONFIG_TRACING
 501         {
 502                 .ctl_name       = CTL_UNNUMBERED,
 503                 .procname       = "ftrace_dump_on_oops",
 504                 .data           = &ftrace_dump_on_oops,
 505                 .maxlen         = sizeof(int),
 506                 .mode           = 0644,
 507                 .proc_handler   = &proc_dointvec,
 508         },
 509 #endif
 510 #ifdef CONFIG_MODULES
 511         {
 512                 .ctl_name       = KERN_MODPROBE,
 513                 .procname       = "modprobe",
 514                 .data           = &modprobe_path,
 515                 .maxlen         = KMOD_PATH_LEN,
 516                 .mode           = 0644,
 517                 .proc_handler   = &proc_dostring,
 518                 .strategy       = &sysctl_string,
 519         },
 520 #endif
 521 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 522         {
 523                 .ctl_name       = KERN_HOTPLUG,
 524                 .procname       = "hotplug",
 525                 .data           = &uevent_helper,
 526                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 527                 .mode           = 0644,
 528                 .proc_handler   = &proc_dostring,
 529                 .strategy       = &sysctl_string,
 530         },
 531 #endif
 532 #ifdef CONFIG_CHR_DEV_SG
 533         {
 534                 .ctl_name       = KERN_SG_BIG_BUFF,
 535                 .procname       = "sg-big-buff",
 536                 .data           = &sg_big_buff,
 537                 .maxlen         = sizeof (int),
 538                 .mode           = 0444,
 539                 .proc_handler   = &proc_dointvec,
 540         },
 541 #endif
 542 #ifdef CONFIG_BSD_PROCESS_ACCT
 543         {
 544                 .ctl_name       = KERN_ACCT,
 545                 .procname       = "acct",
 546                 .data           = &acct_parm,
 547                 .maxlen         = 3*sizeof(int),
 548                 .mode           = 0644,
 549                 .proc_handler   = &proc_dointvec,
 550         },
 551 #endif
 552 #ifdef CONFIG_MAGIC_SYSRQ
 553         {
 554                 .ctl_name       = KERN_SYSRQ,
 555                 .procname       = "sysrq",
 556                 .data           = &__sysrq_enabled,
 557                 .maxlen         = sizeof (int),
 558                 .mode           = 0644,
 559                 .proc_handler   = &proc_dointvec,
 560         },
 561 #endif
 562 #ifdef CONFIG_PROC_SYSCTL
 563         {
 564                 .procname       = "cad_pid",
 565                 .data           = NULL,
 566                 .maxlen         = sizeof (int),
 567                 .mode           = 0600,
 568                 .proc_handler   = &proc_do_cad_pid,
 569         },
 570 #endif
 571         {
 572                 .ctl_name       = KERN_MAX_THREADS,
 573                 .procname       = "threads-max",
 574                 .data           = &max_threads,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec,
 578         },
 579         {
 580                 .ctl_name       = KERN_RANDOM,
 581                 .procname       = "random",
 582                 .mode           = 0555,
 583                 .child          = random_table,
 584         },
 585         {
 586                 .ctl_name       = KERN_OVERFLOWUID,
 587                 .procname       = "overflowuid",
 588                 .data           = &overflowuid,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = &proc_dointvec_minmax,
 592                 .strategy       = &sysctl_intvec,
 593                 .extra1         = &minolduid,
 594                 .extra2         = &maxolduid,
 595         },
 596         {
 597                 .ctl_name       = KERN_OVERFLOWGID,
 598                 .procname       = "overflowgid",
 599                 .data           = &overflowgid,
 600                 .maxlen         = sizeof(int),
 601                 .mode           = 0644,
 602                 .proc_handler   = &proc_dointvec_minmax,
 603                 .strategy       = &sysctl_intvec,
 604                 .extra1         = &minolduid,
 605                 .extra2         = &maxolduid,
 606         },
 607 #ifdef CONFIG_S390
 608 #ifdef CONFIG_MATHEMU
 609         {
 610                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 611                 .procname       = "ieee_emulation_warnings",
 612                 .data           = &sysctl_ieee_emulation_warnings,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec,
 616         },
 617 #endif
 618         {
 619                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 620                 .procname       = "userprocess_debug",
 621                 .data           = &sysctl_userprocess_debug,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = &proc_dointvec,
 625         },
 626 #endif
 627         {
 628                 .ctl_name       = KERN_PIDMAX,
 629                 .procname       = "pid_max",
 630                 .data           = &pid_max,
 631                 .maxlen         = sizeof (int),
 632                 .mode           = 0644,
 633                 .proc_handler   = &proc_dointvec_minmax,
 634                 .strategy       = sysctl_intvec,
 635                 .extra1         = &pid_max_min,
 636                 .extra2         = &pid_max_max,
 637         },
 638         {
 639                 .ctl_name       = KERN_PANIC_ON_OOPS,
 640                 .procname       = "panic_on_oops",
 641                 .data           = &panic_on_oops,
 642                 .maxlen         = sizeof(int),
 643                 .mode           = 0644,
 644                 .proc_handler   = &proc_dointvec,
 645         },
 646 #if defined CONFIG_PRINTK
 647         {
 648                 .ctl_name       = KERN_PRINTK,
 649                 .procname       = "printk",
 650                 .data           = &console_loglevel,
 651                 .maxlen         = 4*sizeof(int),
 652                 .mode           = 0644,
 653                 .proc_handler   = &proc_dointvec,
 654         },
 655         {
 656                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 657                 .procname       = "printk_ratelimit",
 658                 .data           = &printk_ratelimit_state.interval,
 659                 .maxlen         = sizeof(int),
 660                 .mode           = 0644,
 661                 .proc_handler   = &proc_dointvec_jiffies,
 662                 .strategy       = &sysctl_jiffies,
 663         },
 664         {
 665                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 666                 .procname       = "printk_ratelimit_burst",
 667                 .data           = &printk_ratelimit_state.burst,
 668                 .maxlen         = sizeof(int),
 669                 .mode           = 0644,
 670                 .proc_handler   = &proc_dointvec,
 671         },
 672 #endif
 673         {
 674                 .ctl_name       = KERN_NGROUPS_MAX,
 675                 .procname       = "ngroups_max",
 676                 .data           = &ngroups_max,
 677                 .maxlen         = sizeof (int),
 678                 .mode           = 0444,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 682         {
 683                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 684                 .procname       = "unknown_nmi_panic",
 685                 .data           = &unknown_nmi_panic,
 686                 .maxlen         = sizeof (int),
 687                 .mode           = 0644,
 688                 .proc_handler   = &proc_dointvec,
 689         },
 690         {
 691                 .procname       = "nmi_watchdog",
 692                 .data           = &nmi_watchdog_enabled,
 693                 .maxlen         = sizeof (int),
 694                 .mode           = 0644,
 695                 .proc_handler   = &proc_nmi_enabled,
 696         },
 697 #endif
 698 #if defined(CONFIG_X86)
 699         {
 700                 .ctl_name       = KERN_PANIC_ON_NMI,
 701                 .procname       = "panic_on_unrecovered_nmi",
 702                 .data           = &panic_on_unrecovered_nmi,
 703                 .maxlen         = sizeof(int),
 704                 .mode           = 0644,
 705                 .proc_handler   = &proc_dointvec,
 706         },
 707         {
 708                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 709                 .procname       = "bootloader_type",
 710                 .data           = &bootloader_type,
 711                 .maxlen         = sizeof (int),
 712                 .mode           = 0444,
 713                 .proc_handler   = &proc_dointvec,
 714         },
 715         {
 716                 .ctl_name       = CTL_UNNUMBERED,
 717                 .procname       = "kstack_depth_to_print",
 718                 .data           = &kstack_depth_to_print,
 719                 .maxlen         = sizeof(int),
 720                 .mode           = 0644,
 721                 .proc_handler   = &proc_dointvec,
 722         },
 723         {
 724                 .ctl_name       = CTL_UNNUMBERED,
 725                 .procname       = "io_delay_type",
 726                 .data           = &io_delay_type,
 727                 .maxlen         = sizeof(int),
 728                 .mode           = 0644,
 729                 .proc_handler   = &proc_dointvec,
 730         },
 731 #endif
 732 #if defined(CONFIG_MMU)
 733         {
 734                 .ctl_name       = KERN_RANDOMIZE,
 735                 .procname       = "randomize_va_space",
 736                 .data           = &randomize_va_space,
 737                 .maxlen         = sizeof(int),
 738                 .mode           = 0644,
 739                 .proc_handler   = &proc_dointvec,
 740         },
 741 #endif
 742 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 743         {
 744                 .ctl_name       = KERN_SPIN_RETRY,
 745                 .procname       = "spin_retry",
 746                 .data           = &spin_retry,
 747                 .maxlen         = sizeof (int),
 748                 .mode           = 0644,
 749                 .proc_handler   = &proc_dointvec,
 750         },
 751 #endif
 752 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 753         {
 754                 .procname       = "acpi_video_flags",
 755                 .data           = &acpi_realmode_flags,
 756                 .maxlen         = sizeof (unsigned long),
 757                 .mode           = 0644,
 758                 .proc_handler   = &proc_doulongvec_minmax,
 759         },
 760 #endif
 761 #ifdef CONFIG_IA64
 762         {
 763                 .ctl_name       = KERN_IA64_UNALIGNED,
 764                 .procname       = "ignore-unaligned-usertrap",
 765                 .data           = &no_unaligned_warning,
 766                 .maxlen         = sizeof (int),
 767                 .mode           = 0644,
 768                 .proc_handler   = &proc_dointvec,
 769         },
 770 #endif
 771 #ifdef CONFIG_DETECT_SOFTLOCKUP
 772         {
 773                 .ctl_name       = CTL_UNNUMBERED,
 774                 .procname       = "softlockup_panic",
 775                 .data           = &softlockup_panic,
 776                 .maxlen         = sizeof(int),
 777                 .mode           = 0644,
 778                 .proc_handler   = &proc_dointvec_minmax,
 779                 .strategy       = &sysctl_intvec,
 780                 .extra1         = &zero,
 781                 .extra2         = &one,
 782         },
 783         {
 784                 .ctl_name       = CTL_UNNUMBERED,
 785                 .procname       = "softlockup_thresh",
 786                 .data           = &softlockup_thresh,
 787                 .maxlen         = sizeof(int),
 788                 .mode           = 0644,
 789                 .proc_handler   = &proc_dointvec_minmax,
 790                 .strategy       = &sysctl_intvec,
 791                 .extra1         = &neg_one,
 792                 .extra2         = &sixty,
 793         },
 794         {
 795                 .ctl_name       = CTL_UNNUMBERED,
 796                 .procname       = "hung_task_check_count",
 797                 .data           = &sysctl_hung_task_check_count,
 798                 .maxlen         = sizeof(unsigned long),
 799                 .mode           = 0644,
 800                 .proc_handler   = &proc_doulongvec_minmax,
 801                 .strategy       = &sysctl_intvec,
 802         },
 803         {
 804                 .ctl_name       = CTL_UNNUMBERED,
 805                 .procname       = "hung_task_timeout_secs",
 806                 .data           = &sysctl_hung_task_timeout_secs,
 807                 .maxlen         = sizeof(unsigned long),
 808                 .mode           = 0644,
 809                 .proc_handler   = &proc_doulongvec_minmax,
 810                 .strategy       = &sysctl_intvec,
 811         },
 812         {
 813                 .ctl_name       = CTL_UNNUMBERED,
 814                 .procname       = "hung_task_warnings",
 815                 .data           = &sysctl_hung_task_warnings,
 816                 .maxlen         = sizeof(unsigned long),
 817                 .mode           = 0644,
 818                 .proc_handler   = &proc_doulongvec_minmax,
 819                 .strategy       = &sysctl_intvec,
 820         },
 821 #endif
 822 #ifdef CONFIG_COMPAT
 823         {
 824                 .ctl_name       = KERN_COMPAT_LOG,
 825                 .procname       = "compat-log",
 826                 .data           = &compat_log,
 827                 .maxlen         = sizeof (int),
 828                 .mode           = 0644,
 829                 .proc_handler   = &proc_dointvec,
 830         },
 831 #endif
 832 #ifdef CONFIG_RT_MUTEXES
 833         {
 834                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 835                 .procname       = "max_lock_depth",
 836                 .data           = &max_lock_depth,
 837                 .maxlen         = sizeof(int),
 838                 .mode           = 0644,
 839                 .proc_handler   = &proc_dointvec,
 840         },
 841 #endif
 842         {
 843                 .ctl_name       = CTL_UNNUMBERED,
 844                 .procname       = "poweroff_cmd",
 845                 .data           = &poweroff_cmd,
 846                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 847                 .mode           = 0644,
 848                 .proc_handler   = &proc_dostring,
 849                 .strategy       = &sysctl_string,
 850         },
 851 #ifdef CONFIG_KEYS
 852         {
 853                 .ctl_name       = CTL_UNNUMBERED,
 854                 .procname       = "keys",
 855                 .mode           = 0555,
 856                 .child          = key_sysctls,
 857         },
 858 #endif
 859 #ifdef CONFIG_RCU_TORTURE_TEST
 860         {
 861                 .ctl_name       = CTL_UNNUMBERED,
 862                 .procname       = "rcutorture_runnable",
 863                 .data           = &rcutorture_runnable,
 864                 .maxlen         = sizeof(int),
 865                 .mode           = 0644,
 866                 .proc_handler   = &proc_dointvec,
 867         },
 868 #endif
 869 #ifdef CONFIG_UNEVICTABLE_LRU
 870         {
 871                 .ctl_name       = CTL_UNNUMBERED,
 872                 .procname       = "scan_unevictable_pages",
 873                 .data           = &scan_unevictable_pages,
 874                 .maxlen         = sizeof(scan_unevictable_pages),
 875                 .mode           = 0644,
 876                 .proc_handler   = &scan_unevictable_handler,
 877         },
 878 #endif
 879 /*
 880  * NOTE: do not add new entries to this table unless you have read
 881  * Documentation/sysctl/ctl_unnumbered.txt
 882  */
 883         { .ctl_name = 0 }
 884 };
 885
 886 static struct ctl_table vm_table[] = {
 887         {
 888                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 889                 .procname       = "overcommit_memory",
 890                 .data           = &sysctl_overcommit_memory,
 891                 .maxlen         = sizeof(sysctl_overcommit_memory),
 892                 .mode           = 0644,
 893                 .proc_handler   = &proc_dointvec,
 894         },
 895         {
 896                 .ctl_name       = VM_PANIC_ON_OOM,
 897                 .procname       = "panic_on_oom",
 898                 .data           = &sysctl_panic_on_oom,
 899                 .maxlen         = sizeof(sysctl_panic_on_oom),
 900                 .mode           = 0644,
 901                 .proc_handler   = &proc_dointvec,
 902         },
 903         {
 904                 .ctl_name       = CTL_UNNUMBERED,
 905                 .procname       = "oom_kill_allocating_task",
 906                 .data           = &sysctl_oom_kill_allocating_task,
 907                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 908                 .mode           = 0644,
 909                 .proc_handler   = &proc_dointvec,
 910         },
 911         {
 912                 .ctl_name       = CTL_UNNUMBERED,
 913                 .procname       = "oom_dump_tasks",
 914                 .data           = &sysctl_oom_dump_tasks,
 915                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 916                 .mode           = 0644,
 917                 .proc_handler   = &proc_dointvec,
 918         },
 919         {
 920                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 921                 .procname       = "overcommit_ratio",
 922                 .data           = &sysctl_overcommit_ratio,
 923                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 924                 .mode           = 0644,
 925                 .proc_handler   = &proc_dointvec,
 926         },
 927         {
 928                 .ctl_name       = VM_PAGE_CLUSTER,
 929                 .procname       = "page-cluster",
 930                 .data           = &page_cluster,
 931                 .maxlen         = sizeof(int),
 932                 .mode           = 0644,
 933                 .proc_handler   = &proc_dointvec,
 934         },
 935         {
 936                 .ctl_name       = VM_DIRTY_BACKGROUND,
 937                 .procname       = "dirty_background_ratio",
 938                 .data           = &dirty_background_ratio,
 939                 .maxlen         = sizeof(dirty_background_ratio),
 940                 .mode           = 0644,
 941                 .proc_handler   = &proc_dointvec_minmax,
 942                 .strategy       = &sysctl_intvec,
 943                 .extra1         = &zero,
 944                 .extra2         = &one_hundred,
 945         },
 946         {
 947                 .ctl_name       = VM_DIRTY_RATIO,
 948                 .procname       = "dirty_ratio",
 949                 .data           = &vm_dirty_ratio,
 950                 .maxlen         = sizeof(vm_dirty_ratio),
 951                 .mode           = 0644,
 952                 .proc_handler   = &dirty_ratio_handler,
 953                 .strategy       = &sysctl_intvec,
 954                 .extra1         = &zero,
 955                 .extra2         = &one_hundred,
 956         },
 957         {
 958                 .procname       = "dirty_writeback_centisecs",
 959                 .data           = &dirty_writeback_interval,
 960                 .maxlen         = sizeof(dirty_writeback_interval),
 961                 .mode           = 0644,
 962                 .proc_handler   = &dirty_writeback_centisecs_handler,
 963         },
 964         {
 965                 .procname       = "dirty_expire_centisecs",
 966                 .data           = &dirty_expire_interval,
 967                 .maxlen         = sizeof(dirty_expire_interval),
 968                 .mode           = 0644,
 969                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 970         },
 971         {
 972                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 973                 .procname       = "nr_pdflush_threads",
 974                 .data           = &nr_pdflush_threads,
 975                 .maxlen         = sizeof nr_pdflush_threads,
 976                 .mode           = 0444 /* read-only*/,
 977                 .proc_handler   = &proc_dointvec,
 978         },
 979         {
 980                 .ctl_name       = VM_SWAPPINESS,
 981                 .procname       = "swappiness",
 982                 .data           = &vm_swappiness,
 983                 .maxlen         = sizeof(vm_swappiness),
 984                 .mode           = 0644,
 985                 .proc_handler   = &proc_dointvec_minmax,
 986                 .strategy       = &sysctl_intvec,
 987                 .extra1         = &zero,
 988                 .extra2         = &one_hundred,
 989         },
 990 #ifdef CONFIG_HUGETLB_PAGE
 991          {
 992                 .procname       = "nr_hugepages",
 993                 .data           = NULL,
 994                 .maxlen         = sizeof(unsigned long),
 995                 .mode           = 0644,
 996                 .proc_handler   = &hugetlb_sysctl_handler,
 997                 .extra1         = (void *)&hugetlb_zero,
 998                 .extra2         = (void *)&hugetlb_infinity,
 999          },
1000          {
1001                 .ctl_name       = VM_HUGETLB_GROUP,
1002                 .procname       = "hugetlb_shm_group",
1003                 .data           = &sysctl_hugetlb_shm_group,
1004                 .maxlen         = sizeof(gid_t),
1005                 .mode           = 0644,
1006                 .proc_handler   = &proc_dointvec,
1007          },
1008          {
1009                 .ctl_name       = CTL_UNNUMBERED,
1010                 .procname       = "hugepages_treat_as_movable",
1011                 .data           = &hugepages_treat_as_movable,
1012                 .maxlen         = sizeof(int),
1013                 .mode           = 0644,
1014                 .proc_handler   = &hugetlb_treat_movable_handler,
1015         },
1016         {
1017                 .ctl_name       = CTL_UNNUMBERED,
1018                 .procname       = "nr_overcommit_hugepages",
1019                 .data           = NULL,
1020                 .maxlen         = sizeof(unsigned long),
1021                 .mode           = 0644,
1022                 .proc_handler   = &hugetlb_overcommit_handler,
1023                 .extra1         = (void *)&hugetlb_zero,
1024                 .extra2         = (void *)&hugetlb_infinity,
1025         },
1026 #endif
1027         {
1028                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
1029                 .procname       = "lowmem_reserve_ratio",
1030                 .data           = &sysctl_lowmem_reserve_ratio,
1031                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1032                 .mode           = 0644,
1033                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1034                 .strategy       = &sysctl_intvec,
1035         },
1036         {
1037                 .ctl_name       = VM_DROP_PAGECACHE,
1038                 .procname       = "drop_caches",
1039                 .data           = &sysctl_drop_caches,
1040                 .maxlen         = sizeof(int),
1041                 .mode           = 0644,
1042                 .proc_handler   = drop_caches_sysctl_handler,
1043                 .strategy       = &sysctl_intvec,
1044         },
1045         {
1046                 .ctl_name       = VM_MIN_FREE_KBYTES,
1047                 .procname       = "min_free_kbytes",
1048                 .data           = &min_free_kbytes,
1049                 .maxlen         = sizeof(min_free_kbytes),
1050                 .mode           = 0644,
1051                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1052                 .strategy       = &sysctl_intvec,
1053                 .extra1         = &zero,
1054         },
1055         {
1056                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1057                 .procname       = "percpu_pagelist_fraction",
1058                 .data           = &percpu_pagelist_fraction,
1059                 .maxlen         = sizeof(percpu_pagelist_fraction),
1060                 .mode           = 0644,
1061                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1062                 .strategy       = &sysctl_intvec,
1063                 .extra1         = &min_percpu_pagelist_fract,
1064         },
1065 #ifdef CONFIG_MMU
1066         {
1067                 .ctl_name       = VM_MAX_MAP_COUNT,
1068                 .procname       = "max_map_count",
1069                 .data           = &sysctl_max_map_count,
1070                 .maxlen         = sizeof(sysctl_max_map_count),
1071                 .mode           = 0644,
1072                 .proc_handler   = &proc_dointvec
1073         },
1074 #endif
1075         {
1076                 .ctl_name       = VM_LAPTOP_MODE,
1077                 .procname       = "laptop_mode",
1078                 .data           = &laptop_mode,
1079                 .maxlen         = sizeof(laptop_mode),
1080                 .mode           = 0644,
1081                 .proc_handler   = &proc_dointvec_jiffies,
1082                 .strategy       = &sysctl_jiffies,
1083         },
1084         {
1085                 .ctl_name       = VM_BLOCK_DUMP,
1086                 .procname       = "block_dump",
1087                 .data           = &block_dump,
1088                 .maxlen         = sizeof(block_dump),
1089                 .mode           = 0644,
1090                 .proc_handler   = &proc_dointvec,
1091                 .strategy       = &sysctl_intvec,
1092                 .extra1         = &zero,
1093         },
1094         {
1095                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1096                 .procname       = "vfs_cache_pressure",
1097                 .data           = &sysctl_vfs_cache_pressure,
1098                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1099                 .mode           = 0644,
1100                 .proc_handler   = &proc_dointvec,
1101                 .strategy       = &sysctl_intvec,
1102                 .extra1         = &zero,
1103         },
1104 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1105         {
1106                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1107                 .procname       = "legacy_va_layout",
1108                 .data           = &sysctl_legacy_va_layout,
1109                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1110                 .mode           = 0644,
1111                 .proc_handler   = &proc_dointvec,
1112                 .strategy       = &sysctl_intvec,
1113                 .extra1         = &zero,
1114         },
1115 #endif
1116 #ifdef CONFIG_NUMA
1117         {
1118                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1119                 .procname       = "zone_reclaim_mode",
1120                 .data           = &zone_reclaim_mode,
1121                 .maxlen         = sizeof(zone_reclaim_mode),
1122                 .mode           = 0644,
1123                 .proc_handler   = &proc_dointvec,
1124                 .strategy       = &sysctl_intvec,
1125                 .extra1         = &zero,
1126         },
1127         {
1128                 .ctl_name       = VM_MIN_UNMAPPED,
1129                 .procname       = "min_unmapped_ratio",
1130                 .data           = &sysctl_min_unmapped_ratio,
1131                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1132                 .mode           = 0644,
1133                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1134                 .strategy       = &sysctl_intvec,
1135                 .extra1         = &zero,
1136                 .extra2         = &one_hundred,
1137         },
1138         {
1139                 .ctl_name       = VM_MIN_SLAB,
1140                 .procname       = "min_slab_ratio",
1141                 .data           = &sysctl_min_slab_ratio,
1142                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1143                 .mode           = 0644,
1144                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1145                 .strategy       = &sysctl_intvec,
1146                 .extra1         = &zero,
1147                 .extra2         = &one_hundred,
1148         },
1149 #endif
1150 #ifdef CONFIG_SMP
1151         {
1152                 .ctl_name       = CTL_UNNUMBERED,
1153                 .procname       = "stat_interval",
1154                 .data           = &sysctl_stat_interval,
1155                 .maxlen         = sizeof(sysctl_stat_interval),
1156                 .mode           = 0644,
1157                 .proc_handler   = &proc_dointvec_jiffies,
1158                 .strategy       = &sysctl_jiffies,
1159         },
1160 #endif
1161 #ifdef CONFIG_SECURITY
1162         {
1163                 .ctl_name       = CTL_UNNUMBERED,
1164                 .procname       = "mmap_min_addr",
1165                 .data           = &mmap_min_addr,
1166                 .maxlen         = sizeof(unsigned long),
1167                 .mode           = 0644,
1168                 .proc_handler   = &proc_doulongvec_minmax,
1169         },
1170 #endif
1171 #ifdef CONFIG_NUMA
1172         {
1173                 .ctl_name       = CTL_UNNUMBERED,
1174                 .procname       = "numa_zonelist_order",
1175                 .data           = &numa_zonelist_order,
1176                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1177                 .mode           = 0644,
1178                 .proc_handler   = &numa_zonelist_order_handler,
1179                 .strategy       = &sysctl_string,
1180         },
1181 #endif
1182 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1183    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1184         {
1185                 .ctl_name       = VM_VDSO_ENABLED,
1186                 .procname       = "vdso_enabled",
1187                 .data           = &vdso_enabled,
1188                 .maxlen         = sizeof(vdso_enabled),
1189                 .mode           = 0644,
1190                 .proc_handler   = &proc_dointvec,
1191                 .strategy       = &sysctl_intvec,
1192                 .extra1         = &zero,
1193         },
1194 #endif
1195 #ifdef CONFIG_HIGHMEM
1196         {
1197                 .ctl_name       = CTL_UNNUMBERED,
1198                 .procname       = "highmem_is_dirtyable",
1199                 .data           = &vm_highmem_is_dirtyable,
1200                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1201                 .mode           = 0644,
1202                 .proc_handler   = &proc_dointvec_minmax,
1203                 .strategy       = &sysctl_intvec,
1204                 .extra1         = &zero,
1205                 .extra2         = &one,
1206         },
1207 #endif
1208 /*
1209  * NOTE: do not add new entries to this table unless you have read
1210  * Documentation/sysctl/ctl_unnumbered.txt
1211  */
1212         { .ctl_name = 0 }
1213 };
1214
1215 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1216 static struct ctl_table binfmt_misc_table[] = {
1217         { .ctl_name = 0 }
1218 };
1219 #endif
1220
1221 static struct ctl_table fs_table[] = {
1222         {
1223                 .ctl_name       = FS_NRINODE,
1224                 .procname       = "inode-nr",
1225                 .data           = &inodes_stat,
1226                 .maxlen         = 2*sizeof(int),
1227                 .mode           = 0444,
1228                 .proc_handler   = &proc_dointvec,
1229         },
1230         {
1231                 .ctl_name       = FS_STATINODE,
1232                 .procname       = "inode-state",
1233                 .data           = &inodes_stat,
1234                 .maxlen         = 7*sizeof(int),
1235                 .mode           = 0444,
1236                 .proc_handler   = &proc_dointvec,
1237         },
1238         {
1239                 .procname       = "file-nr",
1240                 .data           = &files_stat,
1241                 .maxlen         = 3*sizeof(int),
1242                 .mode           = 0444,
1243                 .proc_handler   = &proc_nr_files,
1244         },
1245         {
1246                 .ctl_name       = FS_MAXFILE,
1247                 .procname       = "file-max",
1248                 .data           = &files_stat.max_files,
1249                 .maxlen         = sizeof(int),
1250                 .mode           = 0644,
1251                 .proc_handler   = &proc_dointvec,
1252         },
1253         {
1254                 .ctl_name       = CTL_UNNUMBERED,
1255                 .procname       = "nr_open",
1256                 .data           = &sysctl_nr_open,
1257                 .maxlen         = sizeof(int),
1258                 .mode           = 0644,
1259                 .proc_handler   = &proc_dointvec_minmax,
1260                 .extra1         = &sysctl_nr_open_min,
1261                 .extra2         = &sysctl_nr_open_max,
1262         },
1263         {
1264                 .ctl_name       = FS_DENTRY,
1265                 .procname       = "dentry-state",
1266                 .data           = &dentry_stat,
1267                 .maxlen         = 6*sizeof(int),
1268                 .mode           = 0444,
1269                 .proc_handler   = &proc_dointvec,
1270         },
1271         {
1272                 .ctl_name       = FS_OVERFLOWUID,
1273                 .procname       = "overflowuid",
1274                 .data           = &fs_overflowuid,
1275                 .maxlen         = sizeof(int),
1276                 .mode           = 0644,
1277                 .proc_handler   = &proc_dointvec_minmax,
1278                 .strategy       = &sysctl_intvec,
1279                 .extra1         = &minolduid,
1280                 .extra2         = &maxolduid,
1281         },
1282         {
1283                 .ctl_name       = FS_OVERFLOWGID,
1284                 .procname       = "overflowgid",
1285                 .data           = &fs_overflowgid,
1286                 .maxlen         = sizeof(int),
1287                 .mode           = 0644,
1288                 .proc_handler   = &proc_dointvec_minmax,
1289                 .strategy       = &sysctl_intvec,
1290                 .extra1         = &minolduid,
1291                 .extra2         = &maxolduid,
1292         },
1293 #ifdef CONFIG_FILE_LOCKING
1294         {
1295                 .ctl_name       = FS_LEASES,
1296                 .procname       = "leases-enable",
1297                 .data           = &leases_enable,
1298                 .maxlen         = sizeof(int),
1299                 .mode           = 0644,
1300                 .proc_handler   = &proc_dointvec,
1301         },
1302 #endif
1303 #ifdef CONFIG_DNOTIFY
1304         {
1305                 .ctl_name       = FS_DIR_NOTIFY,
1306                 .procname       = "dir-notify-enable",
1307                 .data           = &dir_notify_enable,
1308                 .maxlen         = sizeof(int),
1309                 .mode           = 0644,
1310                 .proc_handler   = &proc_dointvec,
1311         },
1312 #endif
1313 #ifdef CONFIG_MMU
1314 #ifdef CONFIG_FILE_LOCKING
1315         {
1316                 .ctl_name       = FS_LEASE_TIME,
1317                 .procname       = "lease-break-time",
1318                 .data           = &lease_break_time,
1319                 .maxlen         = sizeof(int),
1320                 .mode           = 0644,
1321                 .proc_handler   = &proc_dointvec_minmax,
1322                 .strategy       = &sysctl_intvec,
1323                 .extra1         = &zero,
1324                 .extra2         = &two,
1325         },
1326 #endif
1327 #ifdef CONFIG_AIO
1328         {
1329                 .procname       = "aio-nr",
1330                 .data           = &aio_nr,
1331                 .maxlen         = sizeof(aio_nr),
1332                 .mode           = 0444,
1333                 .proc_handler   = &proc_doulongvec_minmax,
1334         },
1335         {
1336                 .procname       = "aio-max-nr",
1337                 .data           = &aio_max_nr,
1338                 .maxlen         = sizeof(aio_max_nr),
1339                 .mode           = 0644,
1340                 .proc_handler   = &proc_doulongvec_minmax,
1341         },
1342 #endif /* CONFIG_AIO */
1343 #ifdef CONFIG_INOTIFY_USER
1344         {
1345                 .ctl_name       = FS_INOTIFY,
1346                 .procname       = "inotify",
1347                 .mode           = 0555,
1348                 .child          = inotify_table,
1349         },
1350 #endif
1351 #ifdef CONFIG_EPOLL
1352         {
1353                 .procname       = "epoll",
1354                 .mode           = 0555,
1355                 .child          = epoll_table,
1356         },
1357 #endif
1358 #endif
1359         {
1360                 .ctl_name       = KERN_SETUID_DUMPABLE,
1361                 .procname       = "suid_dumpable",
1362                 .data           = &suid_dumpable,
1363                 .maxlen         = sizeof(int),
1364                 .mode           = 0644,
1365                 .proc_handler   = &proc_dointvec,
1366         },
1367 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1368         {
1369                 .ctl_name       = CTL_UNNUMBERED,
1370                 .procname       = "binfmt_misc",
1371                 .mode           = 0555,
1372                 .child          = binfmt_misc_table,
1373         },
1374 #endif
1375 /*
1376  * NOTE: do not add new entries to this table unless you have read
1377  * Documentation/sysctl/ctl_unnumbered.txt
1378  */
1379         { .ctl_name = 0 }
1380 };
1381
1382 static struct ctl_table debug_table[] = {
1383 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1384         {
1385                 .ctl_name       = CTL_UNNUMBERED,
1386                 .procname       = "exception-trace",
1387                 .data           = &show_unhandled_signals,
1388                 .maxlen         = sizeof(int),
1389                 .mode           = 0644,
1390                 .proc_handler   = proc_dointvec
1391         },
1392 #endif
1393         { .ctl_name = 0 }
1394 };
1395
1396 static struct ctl_table dev_table[] = {
1397         { .ctl_name = 0 }
1398 };
1399
1400 static DEFINE_SPINLOCK(sysctl_lock);
1401
1402 /* called under sysctl_lock */
1403 static int use_table(struct ctl_table_header *p)
1404 {
1405         if (unlikely(p->unregistering))
1406                 return 0;
1407         p->used++;
1408         return 1;
1409 }
1410
1411 /* called under sysctl_lock */
1412 static void unuse_table(struct ctl_table_header *p)
1413 {
1414         if (!--p->used)
1415                 if (unlikely(p->unregistering))
1416                         complete(p->unregistering);
1417 }
1418
1419 /* called under sysctl_lock, will reacquire if has to wait */
1420 static void start_unregistering(struct ctl_table_header *p)
1421 {
1422         /*
1423          * if p->used is 0, nobody will ever touch that entry again;
1424          * we'll eliminate all paths to it before dropping sysctl_lock
1425          */
1426         if (unlikely(p->used)) {
1427                 struct completion wait;
1428                 init_completion(&wait);
1429                 p->unregistering = &wait;
1430                 spin_unlock(&sysctl_lock);
1431                 wait_for_completion(&wait);
1432                 spin_lock(&sysctl_lock);
1433         } else {
1434                 /* anything non-NULL; we'll never dereference it */
1435                 p->unregistering = ERR_PTR(-EINVAL);
1436         }
1437         /*
1438          * do not remove from the list until nobody holds it; walking the
1439          * list in do_sysctl() relies on that.
1440          */
1441         list_del_init(&p->ctl_entry);
1442 }
1443
1444 void sysctl_head_get(struct ctl_table_header *head)
1445 {
1446         spin_lock(&sysctl_lock);
1447         head->count++;
1448         spin_unlock(&sysctl_lock);
1449 }
1450
1451 void sysctl_head_put(struct ctl_table_header *head)
1452 {
1453         spin_lock(&sysctl_lock);
1454         if (!--head->count)
1455                 kfree(head);
1456         spin_unlock(&sysctl_lock);
1457 }
1458
1459 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1460 {
1461         if (!head)
1462                 BUG();
1463         spin_lock(&sysctl_lock);
1464         if (!use_table(head))
1465                 head = ERR_PTR(-ENOENT);
1466         spin_unlock(&sysctl_lock);
1467         return head;
1468 }
1469
1470 void sysctl_head_finish(struct ctl_table_header *head)
1471 {
1472         if (!head)
1473                 return;
1474         spin_lock(&sysctl_lock);
1475         unuse_table(head);
1476         spin_unlock(&sysctl_lock);
1477 }
1478
1479 static struct ctl_table_set *
1480 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1481 {
1482         struct ctl_table_set *set = &root->default_set;
1483         if (root->lookup)
1484                 set = root->lookup(root, namespaces);
1485         return set;
1486 }
1487
1488 static struct list_head *
1489 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1490 {
1491         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1492         return &set->list;
1493 }
1494
1495 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1496                                             struct ctl_table_header *prev)
1497 {
1498         struct ctl_table_root *root;
1499         struct list_head *header_list;
1500         struct ctl_table_header *head;
1501         struct list_head *tmp;
1502
1503         spin_lock(&sysctl_lock);
1504         if (prev) {
1505                 head = prev;
1506                 tmp = &prev->ctl_entry;
1507                 unuse_table(prev);
1508                 goto next;
1509         }
1510         tmp = &root_table_header.ctl_entry;
1511         for (;;) {
1512                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1513
1514                 if (!use_table(head))
1515                         goto next;
1516                 spin_unlock(&sysctl_lock);
1517                 return head;
1518         next:
1519                 root = head->root;
1520                 tmp = tmp->next;
1521                 header_list = lookup_header_list(root, namespaces);
1522                 if (tmp != header_list)
1523                         continue;
1524
1525                 do {
1526                         root = list_entry(root->root_list.next,
1527                                         struct ctl_table_root, root_list);
1528                         if (root == &sysctl_table_root)
1529                                 goto out;
1530                         header_list = lookup_header_list(root, namespaces);
1531                 } while (list_empty(header_list));
1532                 tmp = header_list->next;
1533         }
1534 out:
1535         spin_unlock(&sysctl_lock);
1536         return NULL;
1537 }
1538
1539 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1540 {
1541         return __sysctl_head_next(current->nsproxy, prev);
1542 }
1543
1544 void register_sysctl_root(struct ctl_table_root *root)
1545 {
1546         spin_lock(&sysctl_lock);
1547         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1548         spin_unlock(&sysctl_lock);
1549 }
1550
1551 #ifdef CONFIG_SYSCTL_SYSCALL
1552 /* Perform the actual read/write of a sysctl table entry. */
1553 static int do_sysctl_strategy(struct ctl_table_root *root,
1554                         struct ctl_table *table,
1555                         void __user *oldval, size_t __user *oldlenp,
1556                         void __user *newval, size_t newlen)
1557 {
1558         int op = 0, rc;
1559
1560         if (oldval)
1561                 op |= MAY_READ;
1562         if (newval)
1563                 op |= MAY_WRITE;
1564         if (sysctl_perm(root, table, op))
1565                 return -EPERM;
1566
1567         if (table->strategy) {
1568                 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1569                 if (rc < 0)
1570                         return rc;
1571                 if (rc > 0)
1572                         return 0;
1573         }
1574
1575         /* If there is no strategy routine, or if the strategy returns
1576          * zero, proceed with automatic r/w */
1577         if (table->data && table->maxlen) {
1578                 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1579                 if (rc < 0)
1580                         return rc;
1581         }
1582         return 0;
1583 }
1584
1585 static int parse_table(int __user *name, int nlen,
1586                        void __user *oldval, size_t __user *oldlenp,
1587                        void __user *newval, size_t newlen,
1588                        struct ctl_table_root *root,
1589                        struct ctl_table *table)
1590 {
1591         int n;
1592 repeat:
1593         if (!nlen)
1594                 return -ENOTDIR;
1595         if (get_user(n, name))
1596                 return -EFAULT;
1597         for ( ; table->ctl_name || table->procname; table++) {
1598                 if (!table->ctl_name)
1599                         continue;
1600                 if (n == table->ctl_name) {
1601                         int error;
1602                         if (table->child) {
1603                                 if (sysctl_perm(root, table, MAY_EXEC))
1604                                         return -EPERM;
1605                                 name++;
1606                                 nlen--;
1607                                 table = table->child;
1608                                 goto repeat;
1609                         }
1610                         error = do_sysctl_strategy(root, table,
1611                                                    oldval, oldlenp,
1612                                                    newval, newlen);
1613                         return error;
1614                 }
1615         }
1616         return -ENOTDIR;
1617 }
1618
1619 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1620                void __user *newval, size_t newlen)
1621 {
1622         struct ctl_table_header *head;
1623         int error = -ENOTDIR;
1624
1625         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1626                 return -ENOTDIR;
1627         if (oldval) {
1628                 int old_len;
1629                 if (!oldlenp || get_user(old_len, oldlenp))
1630                         return -EFAULT;
1631         }
1632
1633         for (head = sysctl_head_next(NULL); head;
1634                         head = sysctl_head_next(head)) {
1635                 error = parse_table(name, nlen, oldval, oldlenp,
1636                                         newval, newlen,
1637                                         head->root, head->ctl_table);
1638                 if (error != -ENOTDIR) {
1639                         sysctl_head_finish(head);
1640                         break;
1641                 }
1642         }
1643         return error;
1644 }
1645
1646 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1647 {
1648         struct __sysctl_args tmp;
1649         int error;
1650
1651         if (copy_from_user(&tmp, args, sizeof(tmp)))
1652                 return -EFAULT;
1653
1654         error = deprecated_sysctl_warning(&tmp);
1655         if (error)
1656                 goto out;
1657
1658         lock_kernel();
1659         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1660                           tmp.newval, tmp.newlen);
1661         unlock_kernel();
1662 out:
1663         return error;
1664 }
1665 #endif /* CONFIG_SYSCTL_SYSCALL */
1666
1667 /*
1668  * sysctl_perm does NOT grant the superuser all rights automatically, because
1669  * some sysctl variables are readonly even to root.
1670  */
1671
1672 static int test_perm(int mode, int op)
1673 {
1674         if (!current_euid())
1675                 mode >>= 6;
1676         else if (in_egroup_p(0))
1677                 mode >>= 3;
1678         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1679                 return 0;
1680         return -EACCES;
1681 }
1682
1683 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1684 {
1685         int error;
1686         int mode;
1687
1688         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1689         if (error)
1690                 return error;
1691
1692         if (root->permissions)
1693                 mode = root->permissions(root, current->nsproxy, table);
1694         else
1695                 mode = table->mode;
1696
1697         return test_perm(mode, op);
1698 }
1699
1700 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1701 {
1702         for (; table->ctl_name || table->procname; table++) {
1703                 table->parent = parent;
1704                 if (table->child)
1705                         sysctl_set_parent(table, table->child);
1706         }
1707 }
1708
1709 static __init int sysctl_init(void)
1710 {
1711         sysctl_set_parent(NULL, root_table);
1712 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1713         {
1714                 int err;
1715                 err = sysctl_check_table(current->nsproxy, root_table);
1716         }
1717 #endif
1718         return 0;
1719 }
1720
1721 core_initcall(sysctl_init);
1722
1723 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1724                                       struct ctl_table *table)
1725 {
1726         struct ctl_table *p;
1727         const char *s = branch->procname;
1728
1729         /* branch should have named subdirectory as its first element */
1730         if (!s || !branch->child)
1731                 return NULL;
1732
1733         /* ... and nothing else */
1734         if (branch[1].procname || branch[1].ctl_name)
1735                 return NULL;
1736
1737         /* table should contain subdirectory with the same name */
1738         for (p = table; p->procname || p->ctl_name; p++) {
1739                 if (!p->child)
1740                         continue;
1741                 if (p->procname && strcmp(p->procname, s) == 0)
1742                         return p;
1743         }
1744         return NULL;
1745 }
1746
1747 /* see if attaching q to p would be an improvement */
1748 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1749 {
1750         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1751         struct ctl_table *next;
1752         int is_better = 0;
1753         int not_in_parent = !p->attached_by;
1754
1755         while ((next = is_branch_in(by, to)) != NULL) {
1756                 if (by == q->attached_by)
1757                         is_better = 1;
1758                 if (to == p->attached_by)
1759                         not_in_parent = 1;
1760                 by = by->child;
1761                 to = next->child;
1762         }
1763
1764         if (is_better && not_in_parent) {
1765                 q->attached_by = by;
1766                 q->attached_to = to;
1767                 q->parent = p;
1768         }
1769 }
1770
1771 /**
1772  * __register_sysctl_paths - register a sysctl hierarchy
1773  * @root: List of sysctl headers to register on
1774  * @namespaces: Data to compute which lists of sysctl entries are visible
1775  * @path: The path to the directory the sysctl table is in.
1776  * @table: the top-level table structure
1777  *
1778  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1779  * array. A completely 0 filled entry terminates the table.
1780  *
1781  * The members of the &struct ctl_table structure are used as follows:
1782  *
1783  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1784  *            must be unique within that level of sysctl
1785  *
1786  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1787  *            enter a sysctl file
1788  *
1789  * data - a pointer to data for use by proc_handler
1790  *
1791  * maxlen - the maximum size in bytes of the data
1792  *
1793  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1794  *
1795  * child - a pointer to the child sysctl table if this entry is a directory, or
1796  *         %NULL.
1797  *
1798  * proc_handler - the text handler routine (described below)
1799  *
1800  * strategy - the strategy routine (described below)
1801  *
1802  * de - for internal use by the sysctl routines
1803  *
1804  * extra1, extra2 - extra pointers usable by the proc handler routines
1805  *
1806  * Leaf nodes in the sysctl tree will be represented by a single file
1807  * under /proc; non-leaf nodes will be represented by directories.
1808  *
1809  * sysctl(2) can automatically manage read and write requests through
1810  * the sysctl table.  The data and maxlen fields of the ctl_table
1811  * struct enable minimal validation of the values being written to be
1812  * performed, and the mode field allows minimal authentication.
1813  *
1814  * More sophisticated management can be enabled by the provision of a
1815  * strategy routine with the table entry.  This will be called before
1816  * any automatic read or write of the data is performed.
1817  *
1818  * The strategy routine may return
1819  *
1820  * < 0 - Error occurred (error is passed to user process)
1821  *
1822  * 0   - OK - proceed with automatic read or write.
1823  *
1824  * > 0 - OK - read or write has been done by the strategy routine, so
1825  *       return immediately.
1826  *
1827  * There must be a proc_handler routine for any terminal nodes
1828  * mirrored under /proc/sys (non-terminals are handled by a built-in
1829  * directory handler).  Several default handlers are available to
1830  * cover common cases -
1831  *
1832  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1833  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1834  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1835  *
1836  * It is the handler's job to read the input buffer from user memory
1837  * and process it. The handler should return 0 on success.
1838  *
1839  * This routine returns %NULL on a failure to register, and a pointer
1840  * to the table header on success.
1841  */
1842 struct ctl_table_header *__register_sysctl_paths(
1843         struct ctl_table_root *root,
1844         struct nsproxy *namespaces,
1845         const struct ctl_path *path, struct ctl_table *table)
1846 {
1847         struct ctl_table_header *header;
1848         struct ctl_table *new, **prevp;
1849         unsigned int n, npath;
1850         struct ctl_table_set *set;
1851
1852         /* Count the path components */
1853         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1854                 ;
1855
1856         /*
1857          * For each path component, allocate a 2-element ctl_table array.
1858          * The first array element will be filled with the sysctl entry
1859          * for this, the second will be the sentinel (ctl_name == 0).
1860          *
1861          * We allocate everything in one go so that we don't have to
1862          * worry about freeing additional memory in unregister_sysctl_table.
1863          */
1864         header = kzalloc(sizeof(struct ctl_table_header) +
1865                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1866         if (!header)
1867                 return NULL;
1868
1869         new = (struct ctl_table *) (header + 1);
1870
1871         /* Now connect the dots */
1872         prevp = &header->ctl_table;
1873         for (n = 0; n < npath; ++n, ++path) {
1874                 /* Copy the procname */
1875                 new->procname = path->procname;
1876                 new->ctl_name = path->ctl_name;
1877                 new->mode     = 0555;
1878
1879                 *prevp = new;
1880                 prevp = &new->child;
1881
1882                 new += 2;
1883         }
1884         *prevp = table;
1885         header->ctl_table_arg = table;
1886
1887         INIT_LIST_HEAD(&header->ctl_entry);
1888         header->used = 0;
1889         header->unregistering = NULL;
1890         header->root = root;
1891         sysctl_set_parent(NULL, header->ctl_table);
1892         header->count = 1;
1893 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1894         if (sysctl_check_table(namespaces, header->ctl_table)) {
1895                 kfree(header);
1896                 return NULL;
1897         }
1898 #endif
1899         spin_lock(&sysctl_lock);
1900         header->set = lookup_header_set(root, namespaces);
1901         header->attached_by = header->ctl_table;
1902         header->attached_to = root_table;
1903         header->parent = &root_table_header;
1904         for (set = header->set; set; set = set->parent) {
1905                 struct ctl_table_header *p;
1906                 list_for_each_entry(p, &set->list, ctl_entry) {
1907                         if (p->unregistering)
1908                                 continue;
1909                         try_attach(p, header);
1910                 }
1911         }
1912         header->parent->count++;
1913         list_add_tail(&header->ctl_entry, &header->set->list);
1914         spin_unlock(&sysctl_lock);
1915
1916         return header;
1917 }
1918
1919 /**
1920  * register_sysctl_table_path - register a sysctl table hierarchy
1921  * @path: The path to the directory the sysctl table is in.
1922  * @table: the top-level table structure
1923  *
1924  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1925  * array. A completely 0 filled entry terminates the table.
1926  *
1927  * See __register_sysctl_paths for more details.
1928  */
1929 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1930                                                 struct ctl_table *table)
1931 {
1932         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1933                                         path, table);
1934 }
1935
1936 /**
1937  * register_sysctl_table - register a sysctl table hierarchy
1938  * @table: the top-level table structure
1939  *
1940  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1941  * array. A completely 0 filled entry terminates the table.
1942  *
1943  * See register_sysctl_paths for more details.
1944  */
1945 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1946 {
1947         static const struct ctl_path null_path[] = { {} };
1948
1949         return register_sysctl_paths(null_path, table);
1950 }
1951
1952 /**
1953  * unregister_sysctl_table - unregister a sysctl table hierarchy
1954  * @header: the header returned from register_sysctl_table
1955  *
1956  * Unregisters the sysctl table and all children. proc entries may not
1957  * actually be removed until they are no longer used by anyone.
1958  */
1959 void unregister_sysctl_table(struct ctl_table_header * header)
1960 {
1961         might_sleep();
1962
1963         if (header == NULL)
1964                 return;
1965
1966         spin_lock(&sysctl_lock);
1967         start_unregistering(header);
1968         if (!--header->parent->count) {
1969                 WARN_ON(1);
1970                 kfree(header->parent);
1971         }
1972         if (!--header->count)
1973                 kfree(header);
1974         spin_unlock(&sysctl_lock);
1975 }
1976
1977 int sysctl_is_seen(struct ctl_table_header *p)
1978 {
1979         struct ctl_table_set *set = p->set;
1980         int res;
1981         spin_lock(&sysctl_lock);
1982         if (p->unregistering)
1983                 res = 0;
1984         else if (!set->is_seen)
1985                 res = 1;
1986         else
1987                 res = set->is_seen(set);
1988         spin_unlock(&sysctl_lock);
1989         return res;
1990 }
1991
1992 void setup_sysctl_set(struct ctl_table_set *p,
1993         struct ctl_table_set *parent,
1994         int (*is_seen)(struct ctl_table_set *))
1995 {
1996         INIT_LIST_HEAD(&p->list);
1997         p->parent = parent ? parent : &sysctl_table_root.default_set;
1998         p->is_seen = is_seen;
1999 }
2000
2001 #else /* !CONFIG_SYSCTL */
2002 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2003 {
2004         return NULL;
2005 }
2006
2007 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2008                                                     struct ctl_table *table)
2009 {
2010         return NULL;
2011 }
2012
2013 void unregister_sysctl_table(struct ctl_table_header * table)
2014 {
2015 }
2016
2017 void setup_sysctl_set(struct ctl_table_set *p,
2018         struct ctl_table_set *parent,
2019         int (*is_seen)(struct ctl_table_set *))
2020 {
2021 }
2022
2023 void sysctl_head_put(struct ctl_table_header *head)
2024 {
2025 }
2026
2027 #endif /* CONFIG_SYSCTL */
2028
2029 /*
2030  * /proc/sys support
2031  */
2032
2033 #ifdef CONFIG_PROC_SYSCTL
2034
2035 static int _proc_do_string(void* data, int maxlen, int write,
2036                            struct file *filp, void __user *buffer,
2037                            size_t *lenp, loff_t *ppos)
2038 {
2039         size_t len;
2040         char __user *p;
2041         char c;
2042
2043         if (!data || !maxlen || !*lenp) {
2044                 *lenp = 0;
2045                 return 0;
2046         }
2047
2048         if (write) {
2049                 len = 0;
2050                 p = buffer;
2051                 while (len < *lenp) {
2052                         if (get_user(c, p++))
2053                                 return -EFAULT;
2054                         if (c == 0 || c == '\n')
2055                                 break;
2056                         len++;
2057                 }
2058                 if (len >= maxlen)
2059                         len = maxlen-1;
2060                 if(copy_from_user(data, buffer, len))
2061                         return -EFAULT;
2062                 ((char *) data)[len] = 0;
2063                 *ppos += *lenp;
2064         } else {
2065                 len = strlen(data);
2066                 if (len > maxlen)
2067                         len = maxlen;
2068
2069                 if (*ppos > len) {
2070                         *lenp = 0;
2071                         return 0;
2072                 }
2073
2074                 data += *ppos;
2075                 len  -= *ppos;
2076
2077                 if (len > *lenp)
2078                         len = *lenp;
2079                 if (len)
2080                         if(copy_to_user(buffer, data, len))
2081                                 return -EFAULT;
2082                 if (len < *lenp) {
2083                         if(put_user('\n', ((char __user *) buffer) + len))
2084                                 return -EFAULT;
2085                         len++;
2086                 }
2087                 *lenp = len;
2088                 *ppos += len;
2089         }
2090         return 0;
2091 }
2092
2093 /**
2094  * proc_dostring - read a string sysctl
2095  * @table: the sysctl table
2096  * @write: %TRUE if this is a write to the sysctl file
2097  * @filp: the file structure
2098  * @buffer: the user buffer
2099  * @lenp: the size of the user buffer
2100  * @ppos: file position
2101  *
2102  * Reads/writes a string from/to the user buffer. If the kernel
2103  * buffer provided is not large enough to hold the string, the
2104  * string is truncated. The copied string is %NULL-terminated.
2105  * If the string is being read by the user process, it is copied
2106  * and a newline '\n' is added. It is truncated if the buffer is
2107  * not large enough.
2108  *
2109  * Returns 0 on success.
2110  */
2111 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2112                   void __user *buffer, size_t *lenp, loff_t *ppos)
2113 {
2114         return _proc_do_string(table->data, table->maxlen, write, filp,
2115                                buffer, lenp, ppos);
2116 }
2117
2118
2119 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2120                                  int *valp,
2121                                  int write, void *data)
2122 {
2123         if (write) {
2124                 *valp = *negp ? -*lvalp : *lvalp;
2125         } else {
2126                 int val = *valp;
2127                 if (val < 0) {
2128                         *negp = -1;
2129                         *lvalp = (unsigned long)-val;
2130                 } else {
2131                         *negp = 0;
2132                         *lvalp = (unsigned long)val;
2133                 }
2134         }
2135         return 0;
2136 }
2137
2138 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2139                   int write, struct file *filp, void __user *buffer,
2140                   size_t *lenp, loff_t *ppos,
2141                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2142                               int write, void *data),
2143                   void *data)
2144 {
2145 #define TMPBUFLEN 21
2146         int *i, vleft, first=1, neg, val;
2147         unsigned long lval;
2148         size_t left, len;
2149
2150         char buf[TMPBUFLEN], *p;
2151         char __user *s = buffer;
2152
2153         if (!tbl_data || !table->maxlen || !*lenp ||
2154             (*ppos && !write)) {
2155                 *lenp = 0;
2156                 return 0;
2157         }
2158
2159         i = (int *) tbl_data;
2160         vleft = table->maxlen / sizeof(*i);
2161         left = *lenp;
2162
2163         if (!conv)
2164                 conv = do_proc_dointvec_conv;
2165
2166         for (; left && vleft--; i++, first=0) {
2167                 if (write) {
2168                         while (left) {
2169                                 char c;
2170                                 if (get_user(c, s))
2171                                         return -EFAULT;
2172                                 if (!isspace(c))
2173                                         break;
2174                                 left--;
2175                                 s++;
2176                         }
2177                         if (!left)
2178                                 break;
2179                         neg = 0;
2180                         len = left;
2181                         if (len > sizeof(buf) - 1)
2182                                 len = sizeof(buf) - 1;
2183                         if (copy_from_user(buf, s, len))
2184                                 return -EFAULT;
2185                         buf[len] = 0;
2186                         p = buf;
2187                         if (*p == '-' && left > 1) {
2188                                 neg = 1;
2189                                 p++;
2190                         }
2191                         if (*p < '0' || *p > '9')
2192                                 break;
2193
2194                         lval = simple_strtoul(p, &p, 0);
2195
2196                         len = p-buf;
2197                         if ((len < left) && *p && !isspace(*p))
2198                                 break;
2199                         if (neg)
2200                                 val = -val;
2201                         s += len;
2202                         left -= len;
2203
2204                         if (conv(&neg, &lval, i, 1, data))
2205                                 break;
2206                 } else {
2207                         p = buf;
2208                         if (!first)
2209                                 *p++ = '\t';
2210
2211                         if (conv(&neg, &lval, i, 0, data))
2212                                 break;
2213
2214                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2215                         len = strlen(buf);
2216                         if (len > left)
2217                                 len = left;
2218                         if(copy_to_user(s, buf, len))
2219                                 return -EFAULT;
2220                         left -= len;
2221                         s += len;
2222                 }
2223         }
2224
2225         if (!write && !first && left) {
2226                 if(put_user('\n', s))
2227                         return -EFAULT;
2228                 left--, s++;
2229         }
2230         if (write) {
2231                 while (left) {
2232                         char c;
2233                         if (get_user(c, s++))
2234                                 return -EFAULT;
2235                         if (!isspace(c))
2236                                 break;
2237                         left--;
2238                 }
2239         }
2240         if (write && first)
2241                 return -EINVAL;
2242         *lenp -= left;
2243         *ppos += *lenp;
2244         return 0;
2245 #undef TMPBUFLEN
2246 }
2247
2248 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2249                   void __user *buffer, size_t *lenp, loff_t *ppos,
2250                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2251                               int write, void *data),
2252                   void *data)
2253 {
2254         return __do_proc_dointvec(table->data, table, write, filp,
2255                         buffer, lenp, ppos, conv, data);
2256 }
2257
2258 /**
2259  * proc_dointvec - read a vector of integers
2260  * @table: the sysctl table
2261  * @write: %TRUE if this is a write to the sysctl file
2262  * @filp: the file structure
2263  * @buffer: the user buffer
2264  * @lenp: the size of the user buffer
2265  * @ppos: file position
2266  *
2267  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2268  * values from/to the user buffer, treated as an ASCII string.
2269  *
2270  * Returns 0 on success.
2271  */
2272 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2273                      void __user *buffer, size_t *lenp, loff_t *ppos)
2274 {
2275     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2276                             NULL,NULL);
2277 }
2278
2279 /*
2280  * Taint values can only be increased
2281  * This means we can safely use a temporary.
2282  */
2283 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2284                                void __user *buffer, size_t *lenp, loff_t *ppos)
2285 {
2286         struct ctl_table t;
2287         unsigned long tmptaint = get_taint();
2288         int err;
2289
2290         if (write && !capable(CAP_SYS_ADMIN))
2291                 return -EPERM;
2292
2293         t = *table;
2294         t.data = &tmptaint;
2295         err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2296         if (err < 0)
2297                 return err;
2298
2299         if (write) {
2300                 /*
2301                  * Poor man's atomic or. Not worth adding a primitive
2302                  * to everyone's atomic.h for this
2303                  */
2304                 int i;
2305                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2306                         if ((tmptaint >> i) & 1)
2307                                 add_taint(i);
2308                 }
2309         }
2310
2311         return err;
2312 }
2313
2314 struct do_proc_dointvec_minmax_conv_param {
2315         int *min;
2316         int *max;
2317 };
2318
2319 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2320                                         int *valp,
2321                                         int write, void *data)
2322 {
2323         struct do_proc_dointvec_minmax_conv_param *param = data;
2324         if (write) {
2325                 int val = *negp ? -*lvalp : *lvalp;
2326                 if ((param->min && *param->min > val) ||
2327                     (param->max && *param->max < val))
2328                         return -EINVAL;
2329                 *valp = val;
2330         } else {
2331                 int val = *valp;
2332                 if (val < 0) {
2333                         *negp = -1;
2334                         *lvalp = (unsigned long)-val;
2335                 } else {
2336                         *negp = 0;
2337                         *lvalp = (unsigned long)val;
2338                 }
2339         }
2340         return 0;
2341 }
2342
2343 /**
2344  * proc_dointvec_minmax - read a vector of integers with min/max values
2345  * @table: the sysctl table
2346  * @write: %TRUE if this is a write to the sysctl file
2347  * @filp: the file structure
2348  * @buffer: the user buffer
2349  * @lenp: the size of the user buffer
2350  * @ppos: file position
2351  *
2352  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2353  * values from/to the user buffer, treated as an ASCII string.
2354  *
2355  * This routine will ensure the values are within the range specified by
2356  * table->extra1 (min) and table->extra2 (max).
2357  *
2358  * Returns 0 on success.
2359  */
2360 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2361                   void __user *buffer, size_t *lenp, loff_t *ppos)
2362 {
2363         struct do_proc_dointvec_minmax_conv_param param = {
2364                 .min = (int *) table->extra1,
2365                 .max = (int *) table->extra2,
2366         };
2367         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2368                                 do_proc_dointvec_minmax_conv, &param);
2369 }
2370
2371 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2372                                      struct file *filp,
2373                                      void __user *buffer,
2374                                      size_t *lenp, loff_t *ppos,
2375                                      unsigned long convmul,
2376                                      unsigned long convdiv)
2377 {
2378 #define TMPBUFLEN 21
2379         unsigned long *i, *min, *max, val;
2380         int vleft, first=1, neg;
2381         size_t len, left;
2382         char buf[TMPBUFLEN], *p;
2383         char __user *s = buffer;
2384
2385         if (!data || !table->maxlen || !*lenp ||
2386             (*ppos && !write)) {
2387                 *lenp = 0;
2388                 return 0;
2389         }
2390
2391         i = (unsigned long *) data;
2392         min = (unsigned long *) table->extra1;
2393         max = (unsigned long *) table->extra2;
2394         vleft = table->maxlen / sizeof(unsigned long);
2395         left = *lenp;
2396
2397         for (; left && vleft--; i++, min++, max++, first=0) {
2398                 if (write) {
2399                         while (left) {
2400                                 char c;
2401                                 if (get_user(c, s))
2402                                         return -EFAULT;
2403                                 if (!isspace(c))
2404                                         break;
2405                                 left--;
2406                                 s++;
2407                         }
2408                         if (!left)
2409                                 break;
2410                         neg = 0;
2411                         len = left;
2412                         if (len > TMPBUFLEN-1)
2413                                 len = TMPBUFLEN-1;
2414                         if (copy_from_user(buf, s, len))
2415                                 return -EFAULT;
2416                         buf[len] = 0;
2417                         p = buf;
2418                         if (*p == '-' && left > 1) {
2419                                 neg = 1;
2420                                 p++;
2421                         }
2422                         if (*p < '0' || *p > '9')
2423                                 break;
2424                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2425                         len = p-buf;
2426                         if ((len < left) && *p && !isspace(*p))
2427                                 break;
2428                         if (neg)
2429                                 val = -val;
2430                         s += len;
2431                         left -= len;
2432
2433                         if(neg)
2434                                 continue;
2435                         if ((min && val < *min) || (max && val > *max))
2436                                 continue;
2437                         *i = val;
2438                 } else {
2439                         p = buf;
2440                         if (!first)
2441                                 *p++ = '\t';
2442                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2443                         len = strlen(buf);
2444                         if (len > left)
2445                                 len = left;
2446                         if(copy_to_user(s, buf, len))
2447                                 return -EFAULT;
2448                         left -= len;
2449                         s += len;
2450                 }
2451         }
2452
2453         if (!write && !first && left) {
2454                 if(put_user('\n', s))
2455                         return -EFAULT;
2456                 left--, s++;
2457         }
2458         if (write) {
2459                 while (left) {
2460                         char c;
2461                         if (get_user(c, s++))
2462                                 return -EFAULT;
2463                         if (!isspace(c))
2464                                 break;
2465                         left--;
2466                 }
2467         }
2468         if (write && first)
2469                 return -EINVAL;
2470         *lenp -= left;
2471         *ppos += *lenp;
2472         return 0;
2473 #undef TMPBUFLEN
2474 }
2475
2476 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2477                                      struct file *filp,
2478                                      void __user *buffer,
2479                                      size_t *lenp, loff_t *ppos,
2480                                      unsigned long convmul,
2481                                      unsigned long convdiv)
2482 {
2483         return __do_proc_doulongvec_minmax(table->data, table, write,
2484                         filp, buffer, lenp, ppos, convmul, convdiv);
2485 }
2486
2487 /**
2488  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2489  * @table: the sysctl table
2490  * @write: %TRUE if this is a write to the sysctl file
2491  * @filp: the file structure
2492  * @buffer: the user buffer
2493  * @lenp: the size of the user buffer
2494  * @ppos: file position
2495  *
2496  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2497  * values from/to the user buffer, treated as an ASCII string.
2498  *
2499  * This routine will ensure the values are within the range specified by
2500  * table->extra1 (min) and table->extra2 (max).
2501  *
2502  * Returns 0 on success.
2503  */
2504 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2505                            void __user *buffer, size_t *lenp, loff_t *ppos)
2506 {
2507     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2508 }
2509
2510 /**
2511  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2512  * @table: the sysctl table
2513  * @write: %TRUE if this is a write to the sysctl file
2514  * @filp: the file structure
2515  * @buffer: the user buffer
2516  * @lenp: the size of the user buffer
2517  * @ppos: file position
2518  *
2519  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2520  * values from/to the user buffer, treated as an ASCII string. The values
2521  * are treated as milliseconds, and converted to jiffies when they are stored.
2522  *
2523  * This routine will ensure the values are within the range specified by
2524  * table->extra1 (min) and table->extra2 (max).
2525  *
2526  * Returns 0 on success.
2527  */
2528 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2529                                       struct file *filp,
2530                                       void __user *buffer,
2531                                       size_t *lenp, loff_t *ppos)
2532 {
2533     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2534                                      lenp, ppos, HZ, 1000l);
2535 }
2536
2537
2538 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2539                                          int *valp,
2540                                          int write, void *data)
2541 {
2542         if (write) {
2543                 if (*lvalp > LONG_MAX / HZ)
2544                         return 1;
2545                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2546         } else {
2547                 int val = *valp;
2548                 unsigned long lval;
2549                 if (val < 0) {
2550                         *negp = -1;
2551                         lval = (unsigned long)-val;
2552                 } else {
2553                         *negp = 0;
2554                         lval = (unsigned long)val;
2555                 }
2556                 *lvalp = lval / HZ;
2557         }
2558         return 0;
2559 }
2560
2561 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2562                                                 int *valp,
2563                                                 int write, void *data)
2564 {
2565         if (write) {
2566                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2567                         return 1;
2568                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2569         } else {
2570                 int val = *valp;
2571                 unsigned long lval;
2572                 if (val < 0) {
2573                         *negp = -1;
2574                         lval = (unsigned long)-val;
2575                 } else {
2576                         *negp = 0;
2577                         lval = (unsigned long)val;
2578                 }
2579                 *lvalp = jiffies_to_clock_t(lval);
2580         }
2581         return 0;
2582 }
2583
2584 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2585                                             int *valp,
2586                                             int write, void *data)
2587 {
2588         if (write) {
2589                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2590         } else {
2591                 int val = *valp;
2592                 unsigned long lval;
2593                 if (val < 0) {
2594                         *negp = -1;
2595                         lval = (unsigned long)-val;
2596                 } else {
2597                         *negp = 0;
2598                         lval = (unsigned long)val;
2599                 }
2600                 *lvalp = jiffies_to_msecs(lval);
2601         }
2602         return 0;
2603 }
2604
2605 /**
2606  * proc_dointvec_jiffies - read a vector of integers as seconds
2607  * @table: the sysctl table
2608  * @write: %TRUE if this is a write to the sysctl file
2609  * @filp: the file structure
2610  * @buffer: the user buffer
2611  * @lenp: the size of the user buffer
2612  * @ppos: file position
2613  *
2614  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2615  * values from/to the user buffer, treated as an ASCII string.
2616  * The values read are assumed to be in seconds, and are converted into
2617  * jiffies.
2618  *
2619  * Returns 0 on success.
2620  */
2621 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2622                           void __user *buffer, size_t *lenp, loff_t *ppos)
2623 {
2624     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2625                             do_proc_dointvec_jiffies_conv,NULL);
2626 }
2627
2628 /**
2629  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2630  * @table: the sysctl table
2631  * @write: %TRUE if this is a write to the sysctl file
2632  * @filp: the file structure
2633  * @buffer: the user buffer
2634  * @lenp: the size of the user buffer
2635  * @ppos: pointer to the file position
2636  *
2637  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2638  * values from/to the user buffer, treated as an ASCII string.
2639  * The values read are assumed to be in 1/USER_HZ seconds, and
2640  * are converted into jiffies.
2641  *
2642  * Returns 0 on success.
2643  */
2644 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2645                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2646 {
2647     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2648                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2649 }
2650
2651 /**
2652  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2653  * @table: the sysctl table
2654  * @write: %TRUE if this is a write to the sysctl file
2655  * @filp: the file structure
2656  * @buffer: the user buffer
2657  * @lenp: the size of the user buffer
2658  * @ppos: file position
2659  * @ppos: the current position in the file
2660  *
2661  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2662  * values from/to the user buffer, treated as an ASCII string.
2663  * The values read are assumed to be in 1/1000 seconds, and
2664  * are converted into jiffies.
2665  *
2666  * Returns 0 on success.
2667  */
2668 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2669                              void __user *buffer, size_t *lenp, loff_t *ppos)
2670 {
2671         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2672                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2673 }
2674
2675 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2676                            void __user *buffer, size_t *lenp, loff_t *ppos)
2677 {
2678         struct pid *new_pid;
2679         pid_t tmp;
2680         int r;
2681
2682         tmp = pid_vnr(cad_pid);
2683
2684         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2685                                lenp, ppos, NULL, NULL);
2686         if (r || !write)
2687                 return r;
2688
2689         new_pid = find_get_pid(tmp);
2690         if (!new_pid)
2691                 return -ESRCH;
2692
2693         put_pid(xchg(&cad_pid, new_pid));
2694         return 0;
2695 }
2696
2697 #else /* CONFIG_PROC_FS */
2698
2699 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2700                   void __user *buffer, size_t *lenp, loff_t *ppos)
2701 {
2702         return -ENOSYS;
2703 }
2704
2705 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2706                   void __user *buffer, size_t *lenp, loff_t *ppos)
2707 {
2708         return -ENOSYS;
2709 }
2710
2711 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2712                     void __user *buffer, size_t *lenp, loff_t *ppos)
2713 {
2714         return -ENOSYS;
2715 }
2716
2717 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2718                     void __user *buffer, size_t *lenp, loff_t *ppos)
2719 {
2720         return -ENOSYS;
2721 }
2722
2723 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2724                     void __user *buffer, size_t *lenp, loff_t *ppos)
2725 {
2726         return -ENOSYS;
2727 }
2728
2729 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2730                              void __user *buffer, size_t *lenp, loff_t *ppos)
2731 {
2732         return -ENOSYS;
2733 }
2734
2735 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2736                     void __user *buffer, size_t *lenp, loff_t *ppos)
2737 {
2738         return -ENOSYS;
2739 }
2740
2741 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2742                                       struct file *filp,
2743                                       void __user *buffer,
2744                                       size_t *lenp, loff_t *ppos)
2745 {
2746     return -ENOSYS;
2747 }
2748
2749
2750 #endif /* CONFIG_PROC_FS */
2751
2752
2753 #ifdef CONFIG_SYSCTL_SYSCALL
2754 /*
2755  * General sysctl support routines
2756  */
2757
2758 /* The generic sysctl data routine (used if no strategy routine supplied) */
2759 int sysctl_data(struct ctl_table *table,
2760                 void __user *oldval, size_t __user *oldlenp,
2761                 void __user *newval, size_t newlen)
2762 {
2763         size_t len;
2764
2765         /* Get out of I don't have a variable */
2766         if (!table->data || !table->maxlen)
2767                 return -ENOTDIR;
2768
2769         if (oldval && oldlenp) {
2770                 if (get_user(len, oldlenp))
2771                         return -EFAULT;
2772                 if (len) {
2773                         if (len > table->maxlen)
2774                                 len = table->maxlen;
2775                         if (copy_to_user(oldval, table->data, len))
2776                                 return -EFAULT;
2777                         if (put_user(len, oldlenp))
2778                                 return -EFAULT;
2779                 }
2780         }
2781
2782         if (newval && newlen) {
2783                 if (newlen > table->maxlen)
2784                         newlen = table->maxlen;
2785
2786                 if (copy_from_user(table->data, newval, newlen))
2787                         return -EFAULT;
2788         }
2789         return 1;
2790 }
2791
2792 /* The generic string strategy routine: */
2793 int sysctl_string(struct ctl_table *table,
2794                   void __user *oldval, size_t __user *oldlenp,
2795                   void __user *newval, size_t newlen)
2796 {
2797         if (!table->data || !table->maxlen)
2798                 return -ENOTDIR;
2799
2800         if (oldval && oldlenp) {
2801                 size_t bufsize;
2802                 if (get_user(bufsize, oldlenp))
2803                         return -EFAULT;
2804                 if (bufsize) {
2805                         size_t len = strlen(table->data), copied;
2806
2807                         /* This shouldn't trigger for a well-formed sysctl */
2808                         if (len > table->maxlen)
2809                                 len = table->maxlen;
2810
2811                         /* Copy up to a max of bufsize-1 bytes of the string */
2812                         copied = (len >= bufsize) ? bufsize - 1 : len;
2813
2814                         if (copy_to_user(oldval, table->data, copied) ||
2815                             put_user(0, (char __user *)(oldval + copied)))
2816                                 return -EFAULT;
2817                         if (put_user(len, oldlenp))
2818                                 return -EFAULT;
2819                 }
2820         }
2821         if (newval && newlen) {
2822                 size_t len = newlen;
2823                 if (len > table->maxlen)
2824                         len = table->maxlen;
2825                 if(copy_from_user(table->data, newval, len))
2826                         return -EFAULT;
2827                 if (len == table->maxlen)
2828                         len--;
2829                 ((char *) table->data)[len] = 0;
2830         }
2831         return 1;
2832 }
2833
2834 /*
2835  * This function makes sure that all of the integers in the vector
2836  * are between the minimum and maximum values given in the arrays
2837  * table->extra1 and table->extra2, respectively.
2838  */
2839 int sysctl_intvec(struct ctl_table *table,
2840                 void __user *oldval, size_t __user *oldlenp,
2841                 void __user *newval, size_t newlen)
2842 {
2843
2844         if (newval && newlen) {
2845                 int __user *vec = (int __user *) newval;
2846                 int *min = (int *) table->extra1;
2847                 int *max = (int *) table->extra2;
2848                 size_t length;
2849                 int i;
2850
2851                 if (newlen % sizeof(int) != 0)
2852                         return -EINVAL;
2853
2854                 if (!table->extra1 && !table->extra2)
2855                         return 0;
2856
2857                 if (newlen > table->maxlen)
2858                         newlen = table->maxlen;
2859                 length = newlen / sizeof(int);
2860
2861                 for (i = 0; i < length; i++) {
2862                         int value;
2863                         if (get_user(value, vec + i))
2864                                 return -EFAULT;
2865                         if (min && value < min[i])
2866                                 return -EINVAL;
2867                         if (max && value > max[i])
2868                                 return -EINVAL;
2869                 }
2870         }
2871         return 0;
2872 }
2873
2874 /* Strategy function to convert jiffies to seconds */
2875 int sysctl_jiffies(struct ctl_table *table,
2876                 void __user *oldval, size_t __user *oldlenp,
2877                 void __user *newval, size_t newlen)
2878 {
2879         if (oldval && oldlenp) {
2880                 size_t olen;
2881
2882                 if (get_user(olen, oldlenp))
2883                         return -EFAULT;
2884                 if (olen) {
2885                         int val;
2886
2887                         if (olen < sizeof(int))
2888                                 return -EINVAL;
2889
2890                         val = *(int *)(table->data) / HZ;
2891                         if (put_user(val, (int __user *)oldval))
2892                                 return -EFAULT;
2893                         if (put_user(sizeof(int), oldlenp))
2894                                 return -EFAULT;
2895                 }
2896         }
2897         if (newval && newlen) {
2898                 int new;
2899                 if (newlen != sizeof(int))
2900                         return -EINVAL;
2901                 if (get_user(new, (int __user *)newval))
2902                         return -EFAULT;
2903                 *(int *)(table->data) = new*HZ;
2904         }
2905         return 1;
2906 }
2907
2908 /* Strategy function to convert jiffies to seconds */
2909 int sysctl_ms_jiffies(struct ctl_table *table,
2910                 void __user *oldval, size_t __user *oldlenp,
2911                 void __user *newval, size_t newlen)
2912 {
2913         if (oldval && oldlenp) {
2914                 size_t olen;
2915
2916                 if (get_user(olen, oldlenp))
2917                         return -EFAULT;
2918                 if (olen) {
2919                         int val;
2920
2921                         if (olen < sizeof(int))
2922                                 return -EINVAL;
2923
2924                         val = jiffies_to_msecs(*(int *)(table->data));
2925                         if (put_user(val, (int __user *)oldval))
2926                                 return -EFAULT;
2927                         if (put_user(sizeof(int), oldlenp))
2928                                 return -EFAULT;
2929                 }
2930         }
2931         if (newval && newlen) {
2932                 int new;
2933                 if (newlen != sizeof(int))
2934                         return -EINVAL;
2935                 if (get_user(new, (int __user *)newval))
2936                         return -EFAULT;
2937                 *(int *)(table->data) = msecs_to_jiffies(new);
2938         }
2939         return 1;
2940 }
2941
2942
2943
2944 #else /* CONFIG_SYSCTL_SYSCALL */
2945
2946
2947 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2948 {
2949         struct __sysctl_args tmp;
2950         int error;
2951
2952         if (copy_from_user(&tmp, args, sizeof(tmp)))
2953                 return -EFAULT;
2954
2955         error = deprecated_sysctl_warning(&tmp);
2956
2957         /* If no error reading the parameters then just -ENOSYS ... */
2958         if (!error)
2959                 error = -ENOSYS;
2960
2961         return error;
2962 }
2963
2964 int sysctl_data(struct ctl_table *table,
2965                   void __user *oldval, size_t __user *oldlenp,
2966                   void __user *newval, size_t newlen)
2967 {
2968         return -ENOSYS;
2969 }
2970
2971 int sysctl_string(struct ctl_table *table,
2972                   void __user *oldval, size_t __user *oldlenp,
2973                   void __user *newval, size_t newlen)
2974 {
2975         return -ENOSYS;
2976 }
2977
2978 int sysctl_intvec(struct ctl_table *table,
2979                 void __user *oldval, size_t __user *oldlenp,
2980                 void __user *newval, size_t newlen)
2981 {
2982         return -ENOSYS;
2983 }
2984
2985 int sysctl_jiffies(struct ctl_table *table,
2986                 void __user *oldval, size_t __user *oldlenp,
2987                 void __user *newval, size_t newlen)
2988 {
2989         return -ENOSYS;
2990 }
2991
2992 int sysctl_ms_jiffies(struct ctl_table *table,
2993                 void __user *oldval, size_t __user *oldlenp,
2994                 void __user *newval, size_t newlen)
2995 {
2996         return -ENOSYS;
2997 }
2998
2999 #endif /* CONFIG_SYSCTL_SYSCALL */
3000
3001 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3002 {
3003         static int msg_count;
3004         int name[CTL_MAXNAME];
3005         int i;
3006
3007         /* Check args->nlen. */
3008         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3009                 return -ENOTDIR;
3010
3011         /* Read in the sysctl name for better debug message logging */
3012         for (i = 0; i < args->nlen; i++)
3013                 if (get_user(name[i], args->name + i))
3014                         return -EFAULT;
3015
3016         /* Ignore accesses to kernel.version */
3017         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3018                 return 0;
3019
3020         if (msg_count < 5) {
3021                 msg_count++;
3022                 printk(KERN_INFO
3023                         "warning: process `%s' used the deprecated sysctl "
3024                         "system call with ", current->comm);
3025                 for (i = 0; i < args->nlen; i++)
3026                         printk("%d.", name[i]);
3027                 printk("\n");
3028         }
3029         return 0;
3030 }
3031
3032 /*
3033  * No sense putting this after each symbol definition, twice,
3034  * exception granted :-)
3035  */
3036 EXPORT_SYMBOL(proc_dointvec);
3037 EXPORT_SYMBOL(proc_dointvec_jiffies);
3038 EXPORT_SYMBOL(proc_dointvec_minmax);
3039 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3040 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3041 EXPORT_SYMBOL(proc_dostring);
3042 EXPORT_SYMBOL(proc_doulongvec_minmax);
3043 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3044 EXPORT_SYMBOL(register_sysctl_table);
3045 EXPORT_SYMBOL(register_sysctl_paths);
3046 EXPORT_SYMBOL(sysctl_intvec);
3047 EXPORT_SYMBOL(sysctl_jiffies);
3048 EXPORT_SYMBOL(sysctl_ms_jiffies);
3049 EXPORT_SYMBOL(sysctl_string);
3050 EXPORT_SYMBOL(sysctl_data);
3051 EXPORT_SYMBOL(unregister_sysctl_table);