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