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 maps_protect;
  84 extern int latencytop_enabled;
  85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  86 #ifdef CONFIG_RCU_TORTURE_TEST
  87 extern int rcutorture_runnable;
  88 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
  89
  90 /* Constants used for minimum and  maximum */
  91 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
  92 static int one = 1;
  93 #endif
  94
  95 #ifdef CONFIG_DETECT_SOFTLOCKUP
  96 static int sixty = 60;
  97 static int neg_one = -1;
  98 #endif
  99
 100 #ifdef CONFIG_MMU
 101 static int two = 2;
 102 #endif
 103
 104 static int zero;
 105 static int one_hundred = 100;
 106
 107 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 108 static int maxolduid = 65535;
 109 static int minolduid;
 110 static int min_percpu_pagelist_fract = 8;
 111
 112 static int ngroups_max = NGROUPS_MAX;
 113
 114 #ifdef CONFIG_MODULES
 115 extern char modprobe_path[];
 116 #endif
 117 #ifdef CONFIG_CHR_DEV_SG
 118 extern int sg_big_buff;
 119 #endif
 120
 121 #ifdef __sparc__
 122 extern char reboot_command [];
 123 extern int stop_a_enabled;
 124 extern int scons_pwroff;
 125 #endif
 126
 127 #ifdef __hppa__
 128 extern int pwrsw_enabled;
 129 extern int unaligned_enabled;
 130 #endif
 131
 132 #ifdef CONFIG_S390
 133 #ifdef CONFIG_MATHEMU
 134 extern int sysctl_ieee_emulation_warnings;
 135 #endif
 136 extern int sysctl_userprocess_debug;
 137 extern int spin_retry;
 138 #endif
 139
 140 #ifdef CONFIG_BSD_PROCESS_ACCT
 141 extern int acct_parm[];
 142 #endif
 143
 144 #ifdef CONFIG_IA64
 145 extern int no_unaligned_warning;
 146 #endif
 147
 148 #ifdef CONFIG_RT_MUTEXES
 149 extern int max_lock_depth;
 150 #endif
 151
 152 #ifdef CONFIG_PROC_SYSCTL
 153 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 154                   void __user *buffer, size_t *lenp, loff_t *ppos);
 155 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 156                                void __user *buffer, size_t *lenp, loff_t *ppos);
 157 #endif
 158
 159 static struct ctl_table root_table[];
 160 static struct ctl_table_root sysctl_table_root;
 161 static struct ctl_table_header root_table_header = {
 162         .count = 1,
 163         .ctl_table = root_table,
 164         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
 165         .root = &sysctl_table_root,
 166         .set = &sysctl_table_root.default_set,
 167 };
 168 static struct ctl_table_root sysctl_table_root = {
 169         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 170         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 171 };
 172
 173 static struct ctl_table kern_table[];
 174 static struct ctl_table vm_table[];
 175 static struct ctl_table fs_table[];
 176 static struct ctl_table debug_table[];
 177 static struct ctl_table dev_table[];
 178 extern struct ctl_table random_table[];
 179 #ifdef CONFIG_INOTIFY_USER
 180 extern struct ctl_table inotify_table[];
 181 #endif
 182 #ifdef CONFIG_EPOLL
 183 extern struct ctl_table epoll_table[];
 184 #endif
 185
 186 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 187 int sysctl_legacy_va_layout;
 188 #endif
 189
 190 extern int prove_locking;
 191 extern int lock_stat;
 192
 193 /* The default sysctl tables: */
 194
 195 static struct ctl_table root_table[] = {
 196         {
 197                 .ctl_name       = CTL_KERN,
 198                 .procname       = "kernel",
 199                 .mode           = 0555,
 200                 .child          = kern_table,
 201         },
 202         {
 203                 .ctl_name       = CTL_VM,
 204                 .procname       = "vm",
 205                 .mode           = 0555,
 206                 .child          = vm_table,
 207         },
 208         {
 209                 .ctl_name       = CTL_FS,
 210                 .procname       = "fs",
 211                 .mode           = 0555,
 212                 .child          = fs_table,
 213         },
 214         {
 215                 .ctl_name       = CTL_DEBUG,
 216                 .procname       = "debug",
 217                 .mode           = 0555,
 218                 .child          = debug_table,
 219         },
 220         {
 221                 .ctl_name       = CTL_DEV,
 222                 .procname       = "dev",
 223                 .mode           = 0555,
 224                 .child          = dev_table,
 225         },
 226 /*
 227  * NOTE: do not add new entries to this table unless you have read
 228  * Documentation/sysctl/ctl_unnumbered.txt
 229  */
 230         { .ctl_name = 0 }
 231 };
 232
 233 #ifdef CONFIG_SCHED_DEBUG
 234 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 235 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 236 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 237 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 238 #endif
 239
 240 static struct ctl_table kern_table[] = {
 241 #ifdef CONFIG_SCHED_DEBUG
 242         {
 243                 .ctl_name       = CTL_UNNUMBERED,
 244                 .procname       = "sched_min_granularity_ns",
 245                 .data           = &sysctl_sched_min_granularity,
 246                 .maxlen         = sizeof(unsigned int),
 247                 .mode           = 0644,
 248                 .proc_handler   = &sched_nr_latency_handler,
 249                 .strategy       = &sysctl_intvec,
 250                 .extra1         = &min_sched_granularity_ns,
 251                 .extra2         = &max_sched_granularity_ns,
 252         },
 253         {
 254                 .ctl_name       = CTL_UNNUMBERED,
 255                 .procname       = "sched_latency_ns",
 256                 .data           = &sysctl_sched_latency,
 257                 .maxlen         = sizeof(unsigned int),
 258                 .mode           = 0644,
 259                 .proc_handler   = &sched_nr_latency_handler,
 260                 .strategy       = &sysctl_intvec,
 261                 .extra1         = &min_sched_granularity_ns,
 262                 .extra2         = &max_sched_granularity_ns,
 263         },
 264         {
 265                 .ctl_name       = CTL_UNNUMBERED,
 266                 .procname       = "sched_wakeup_granularity_ns",
 267                 .data           = &sysctl_sched_wakeup_granularity,
 268                 .maxlen         = sizeof(unsigned int),
 269                 .mode           = 0644,
 270                 .proc_handler   = &proc_dointvec_minmax,
 271                 .strategy       = &sysctl_intvec,
 272                 .extra1         = &min_wakeup_granularity_ns,
 273                 .extra2         = &max_wakeup_granularity_ns,
 274         },
 275         {
 276                 .ctl_name       = CTL_UNNUMBERED,
 277                 .procname       = "sched_shares_ratelimit",
 278                 .data           = &sysctl_sched_shares_ratelimit,
 279                 .maxlen         = sizeof(unsigned int),
 280                 .mode           = 0644,
 281                 .proc_handler   = &proc_dointvec,
 282         },
 283         {
 284                 .ctl_name       = CTL_UNNUMBERED,
 285                 .procname       = "sched_child_runs_first",
 286                 .data           = &sysctl_sched_child_runs_first,
 287                 .maxlen         = sizeof(unsigned int),
 288                 .mode           = 0644,
 289                 .proc_handler   = &proc_dointvec,
 290         },
 291         {
 292                 .ctl_name       = CTL_UNNUMBERED,
 293                 .procname       = "sched_features",
 294                 .data           = &sysctl_sched_features,
 295                 .maxlen         = sizeof(unsigned int),
 296                 .mode           = 0644,
 297                 .proc_handler   = &proc_dointvec,
 298         },
 299         {
 300                 .ctl_name       = CTL_UNNUMBERED,
 301                 .procname       = "sched_migration_cost",
 302                 .data           = &sysctl_sched_migration_cost,
 303                 .maxlen         = sizeof(unsigned int),
 304                 .mode           = 0644,
 305                 .proc_handler   = &proc_dointvec,
 306         },
 307         {
 308                 .ctl_name       = CTL_UNNUMBERED,
 309                 .procname       = "sched_nr_migrate",
 310                 .data           = &sysctl_sched_nr_migrate,
 311                 .maxlen         = sizeof(unsigned int),
 312                 .mode           = 0644,
 313                 .proc_handler   = &proc_dointvec,
 314         },
 315 #endif
 316         {
 317                 .ctl_name       = CTL_UNNUMBERED,
 318                 .procname       = "sched_rt_period_us",
 319                 .data           = &sysctl_sched_rt_period,
 320                 .maxlen         = sizeof(unsigned int),
 321                 .mode           = 0644,
 322                 .proc_handler   = &sched_rt_handler,
 323         },
 324         {
 325                 .ctl_name       = CTL_UNNUMBERED,
 326                 .procname       = "sched_rt_runtime_us",
 327                 .data           = &sysctl_sched_rt_runtime,
 328                 .maxlen         = sizeof(int),
 329                 .mode           = 0644,
 330                 .proc_handler   = &sched_rt_handler,
 331         },
 332         {
 333                 .ctl_name       = CTL_UNNUMBERED,
 334                 .procname       = "sched_compat_yield",
 335                 .data           = &sysctl_sched_compat_yield,
 336                 .maxlen         = sizeof(unsigned int),
 337                 .mode           = 0644,
 338                 .proc_handler   = &proc_dointvec,
 339         },
 340 #ifdef CONFIG_PROVE_LOCKING
 341         {
 342                 .ctl_name       = CTL_UNNUMBERED,
 343                 .procname       = "prove_locking",
 344                 .data           = &prove_locking,
 345                 .maxlen         = sizeof(int),
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_dointvec,
 348         },
 349 #endif
 350 #ifdef CONFIG_LOCK_STAT
 351         {
 352                 .ctl_name       = CTL_UNNUMBERED,
 353                 .procname       = "lock_stat",
 354                 .data           = &lock_stat,
 355                 .maxlen         = sizeof(int),
 356                 .mode           = 0644,
 357                 .proc_handler   = &proc_dointvec,
 358         },
 359 #endif
 360         {
 361                 .ctl_name       = KERN_PANIC,
 362                 .procname       = "panic",
 363                 .data           = &panic_timeout,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = &proc_dointvec,
 367         },
 368         {
 369                 .ctl_name       = KERN_CORE_USES_PID,
 370                 .procname       = "core_uses_pid",
 371                 .data           = &core_uses_pid,
 372                 .maxlen         = sizeof(int),
 373                 .mode           = 0644,
 374                 .proc_handler   = &proc_dointvec,
 375         },
 376         {
 377                 .ctl_name       = KERN_CORE_PATTERN,
 378                 .procname       = "core_pattern",
 379                 .data           = core_pattern,
 380                 .maxlen         = CORENAME_MAX_SIZE,
 381                 .mode           = 0644,
 382                 .proc_handler   = &proc_dostring,
 383                 .strategy       = &sysctl_string,
 384         },
 385 #ifdef CONFIG_PROC_SYSCTL
 386         {
 387                 .procname       = "tainted",
 388                 .data           = &tainted,
 389                 .maxlen         = sizeof(int),
 390                 .mode           = 0644,
 391                 .proc_handler   = &proc_dointvec_taint,
 392         },
 393 #endif
 394 #ifdef CONFIG_LATENCYTOP
 395         {
 396                 .procname       = "latencytop",
 397                 .data           = &latencytop_enabled,
 398                 .maxlen         = sizeof(int),
 399                 .mode           = 0644,
 400                 .proc_handler   = &proc_dointvec,
 401         },
 402 #endif
 403 #ifdef CONFIG_BLK_DEV_INITRD
 404         {
 405                 .ctl_name       = KERN_REALROOTDEV,
 406                 .procname       = "real-root-dev",
 407                 .data           = &real_root_dev,
 408                 .maxlen         = sizeof(int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec,
 411         },
 412 #endif
 413         {
 414                 .ctl_name       = CTL_UNNUMBERED,
 415                 .procname       = "print-fatal-signals",
 416                 .data           = &print_fatal_signals,
 417                 .maxlen         = sizeof(int),
 418                 .mode           = 0644,
 419                 .proc_handler   = &proc_dointvec,
 420         },
 421 #ifdef __sparc__
 422         {
 423                 .ctl_name       = KERN_SPARC_REBOOT,
 424                 .procname       = "reboot-cmd",
 425                 .data           = reboot_command,
 426                 .maxlen         = 256,
 427                 .mode           = 0644,
 428                 .proc_handler   = &proc_dostring,
 429                 .strategy       = &sysctl_string,
 430         },
 431         {
 432                 .ctl_name       = KERN_SPARC_STOP_A,
 433                 .procname       = "stop-a",
 434                 .data           = &stop_a_enabled,
 435                 .maxlen         = sizeof (int),
 436                 .mode           = 0644,
 437                 .proc_handler   = &proc_dointvec,
 438         },
 439         {
 440                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 441                 .procname       = "scons-poweroff",
 442                 .data           = &scons_pwroff,
 443                 .maxlen         = sizeof (int),
 444                 .mode           = 0644,
 445                 .proc_handler   = &proc_dointvec,
 446         },
 447 #endif
 448 #ifdef __hppa__
 449         {
 450                 .ctl_name       = KERN_HPPA_PWRSW,
 451                 .procname       = "soft-power",
 452                 .data           = &pwrsw_enabled,
 453                 .maxlen         = sizeof (int),
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dointvec,
 456         },
 457         {
 458                 .ctl_name       = KERN_HPPA_UNALIGNED,
 459                 .procname       = "unaligned-trap",
 460                 .data           = &unaligned_enabled,
 461                 .maxlen         = sizeof (int),
 462                 .mode           = 0644,
 463                 .proc_handler   = &proc_dointvec,
 464         },
 465 #endif
 466         {
 467                 .ctl_name       = KERN_CTLALTDEL,
 468                 .procname       = "ctrl-alt-del",
 469                 .data           = &C_A_D,
 470                 .maxlen         = sizeof(int),
 471                 .mode           = 0644,
 472                 .proc_handler   = &proc_dointvec,
 473         },
 474 #ifdef CONFIG_FTRACE
 475         {
 476                 .ctl_name       = CTL_UNNUMBERED,
 477                 .procname       = "ftrace_enabled",
 478                 .data           = &ftrace_enabled,
 479                 .maxlen         = sizeof(int),
 480                 .mode           = 0644,
 481                 .proc_handler   = &ftrace_enable_sysctl,
 482         },
 483 #endif
 484 #ifdef CONFIG_MODULES
 485         {
 486                 .ctl_name       = KERN_MODPROBE,
 487                 .procname       = "modprobe",
 488                 .data           = &modprobe_path,
 489                 .maxlen         = KMOD_PATH_LEN,
 490                 .mode           = 0644,
 491                 .proc_handler   = &proc_dostring,
 492                 .strategy       = &sysctl_string,
 493         },
 494 #endif
 495 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 496         {
 497                 .ctl_name       = KERN_HOTPLUG,
 498                 .procname       = "hotplug",
 499                 .data           = &uevent_helper,
 500                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 501                 .mode           = 0644,
 502                 .proc_handler   = &proc_dostring,
 503                 .strategy       = &sysctl_string,
 504         },
 505 #endif
 506 #ifdef CONFIG_CHR_DEV_SG
 507         {
 508                 .ctl_name       = KERN_SG_BIG_BUFF,
 509                 .procname       = "sg-big-buff",
 510                 .data           = &sg_big_buff,
 511                 .maxlen         = sizeof (int),
 512                 .mode           = 0444,
 513                 .proc_handler   = &proc_dointvec,
 514         },
 515 #endif
 516 #ifdef CONFIG_BSD_PROCESS_ACCT
 517         {
 518                 .ctl_name       = KERN_ACCT,
 519                 .procname       = "acct",
 520                 .data           = &acct_parm,
 521                 .maxlen         = 3*sizeof(int),
 522                 .mode           = 0644,
 523                 .proc_handler   = &proc_dointvec,
 524         },
 525 #endif
 526 #ifdef CONFIG_MAGIC_SYSRQ
 527         {
 528                 .ctl_name       = KERN_SYSRQ,
 529                 .procname       = "sysrq",
 530                 .data           = &__sysrq_enabled,
 531                 .maxlen         = sizeof (int),
 532                 .mode           = 0644,
 533                 .proc_handler   = &proc_dointvec,
 534         },
 535 #endif
 536 #ifdef CONFIG_PROC_SYSCTL
 537         {
 538                 .procname       = "cad_pid",
 539                 .data           = NULL,
 540                 .maxlen         = sizeof (int),
 541                 .mode           = 0600,
 542                 .proc_handler   = &proc_do_cad_pid,
 543         },
 544 #endif
 545         {
 546                 .ctl_name       = KERN_MAX_THREADS,
 547                 .procname       = "threads-max",
 548                 .data           = &max_threads,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = &proc_dointvec,
 552         },
 553         {
 554                 .ctl_name       = KERN_RANDOM,
 555                 .procname       = "random",
 556                 .mode           = 0555,
 557                 .child          = random_table,
 558         },
 559         {
 560                 .ctl_name       = KERN_OVERFLOWUID,
 561                 .procname       = "overflowuid",
 562                 .data           = &overflowuid,
 563                 .maxlen         = sizeof(int),
 564                 .mode           = 0644,
 565                 .proc_handler   = &proc_dointvec_minmax,
 566                 .strategy       = &sysctl_intvec,
 567                 .extra1         = &minolduid,
 568                 .extra2         = &maxolduid,
 569         },
 570         {
 571                 .ctl_name       = KERN_OVERFLOWGID,
 572                 .procname       = "overflowgid",
 573                 .data           = &overflowgid,
 574                 .maxlen         = sizeof(int),
 575                 .mode           = 0644,
 576                 .proc_handler   = &proc_dointvec_minmax,
 577                 .strategy       = &sysctl_intvec,
 578                 .extra1         = &minolduid,
 579                 .extra2         = &maxolduid,
 580         },
 581 #ifdef CONFIG_S390
 582 #ifdef CONFIG_MATHEMU
 583         {
 584                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 585                 .procname       = "ieee_emulation_warnings",
 586                 .data           = &sysctl_ieee_emulation_warnings,
 587                 .maxlen         = sizeof(int),
 588                 .mode           = 0644,
 589                 .proc_handler   = &proc_dointvec,
 590         },
 591 #endif
 592         {
 593                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 594                 .procname       = "userprocess_debug",
 595                 .data           = &sysctl_userprocess_debug,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = &proc_dointvec,
 599         },
 600 #endif
 601         {
 602                 .ctl_name       = KERN_PIDMAX,
 603                 .procname       = "pid_max",
 604                 .data           = &pid_max,
 605                 .maxlen         = sizeof (int),
 606                 .mode           = 0644,
 607                 .proc_handler   = &proc_dointvec_minmax,
 608                 .strategy       = sysctl_intvec,
 609                 .extra1         = &pid_max_min,
 610                 .extra2         = &pid_max_max,
 611         },
 612         {
 613                 .ctl_name       = KERN_PANIC_ON_OOPS,
 614                 .procname       = "panic_on_oops",
 615                 .data           = &panic_on_oops,
 616                 .maxlen         = sizeof(int),
 617                 .mode           = 0644,
 618                 .proc_handler   = &proc_dointvec,
 619         },
 620 #if defined CONFIG_PRINTK
 621         {
 622                 .ctl_name       = KERN_PRINTK,
 623                 .procname       = "printk",
 624                 .data           = &console_loglevel,
 625                 .maxlen         = 4*sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = &proc_dointvec,
 628         },
 629         {
 630                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 631                 .procname       = "printk_ratelimit",
 632                 .data           = &printk_ratelimit_state.interval,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = &proc_dointvec_jiffies,
 636                 .strategy       = &sysctl_jiffies,
 637         },
 638         {
 639                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 640                 .procname       = "printk_ratelimit_burst",
 641                 .data           = &printk_ratelimit_state.burst,
 642                 .maxlen         = sizeof(int),
 643                 .mode           = 0644,
 644                 .proc_handler   = &proc_dointvec,
 645         },
 646 #endif
 647         {
 648                 .ctl_name       = KERN_NGROUPS_MAX,
 649                 .procname       = "ngroups_max",
 650                 .data           = &ngroups_max,
 651                 .maxlen         = sizeof (int),
 652                 .mode           = 0444,
 653                 .proc_handler   = &proc_dointvec,
 654         },
 655 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 656         {
 657                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 658                 .procname       = "unknown_nmi_panic",
 659                 .data           = &unknown_nmi_panic,
 660                 .maxlen         = sizeof (int),
 661                 .mode           = 0644,
 662                 .proc_handler   = &proc_dointvec,
 663         },
 664         {
 665                 .procname       = "nmi_watchdog",
 666                 .data           = &nmi_watchdog_enabled,
 667                 .maxlen         = sizeof (int),
 668                 .mode           = 0644,
 669                 .proc_handler   = &proc_nmi_enabled,
 670         },
 671 #endif
 672 #if defined(CONFIG_X86)
 673         {
 674                 .ctl_name       = KERN_PANIC_ON_NMI,
 675                 .procname       = "panic_on_unrecovered_nmi",
 676                 .data           = &panic_on_unrecovered_nmi,
 677                 .maxlen         = sizeof(int),
 678                 .mode           = 0644,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681         {
 682                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 683                 .procname       = "bootloader_type",
 684                 .data           = &bootloader_type,
 685                 .maxlen         = sizeof (int),
 686                 .mode           = 0444,
 687                 .proc_handler   = &proc_dointvec,
 688         },
 689         {
 690                 .ctl_name       = CTL_UNNUMBERED,
 691                 .procname       = "kstack_depth_to_print",
 692                 .data           = &kstack_depth_to_print,
 693                 .maxlen         = sizeof(int),
 694                 .mode           = 0644,
 695                 .proc_handler   = &proc_dointvec,
 696         },
 697         {
 698                 .ctl_name       = CTL_UNNUMBERED,
 699                 .procname       = "io_delay_type",
 700                 .data           = &io_delay_type,
 701                 .maxlen         = sizeof(int),
 702                 .mode           = 0644,
 703                 .proc_handler   = &proc_dointvec,
 704         },
 705 #endif
 706 #if defined(CONFIG_MMU)
 707         {
 708                 .ctl_name       = KERN_RANDOMIZE,
 709                 .procname       = "randomize_va_space",
 710                 .data           = &randomize_va_space,
 711                 .maxlen         = sizeof(int),
 712                 .mode           = 0644,
 713                 .proc_handler   = &proc_dointvec,
 714         },
 715 #endif
 716 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 717         {
 718                 .ctl_name       = KERN_SPIN_RETRY,
 719                 .procname       = "spin_retry",
 720                 .data           = &spin_retry,
 721                 .maxlen         = sizeof (int),
 722                 .mode           = 0644,
 723                 .proc_handler   = &proc_dointvec,
 724         },
 725 #endif
 726 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 727         {
 728                 .procname       = "acpi_video_flags",
 729                 .data           = &acpi_realmode_flags,
 730                 .maxlen         = sizeof (unsigned long),
 731                 .mode           = 0644,
 732                 .proc_handler   = &proc_doulongvec_minmax,
 733         },
 734 #endif
 735 #ifdef CONFIG_IA64
 736         {
 737                 .ctl_name       = KERN_IA64_UNALIGNED,
 738                 .procname       = "ignore-unaligned-usertrap",
 739                 .data           = &no_unaligned_warning,
 740                 .maxlen         = sizeof (int),
 741                 .mode           = 0644,
 742                 .proc_handler   = &proc_dointvec,
 743         },
 744 #endif
 745 #ifdef CONFIG_DETECT_SOFTLOCKUP
 746         {
 747                 .ctl_name       = CTL_UNNUMBERED,
 748                 .procname       = "softlockup_panic",
 749                 .data           = &softlockup_panic,
 750                 .maxlen         = sizeof(int),
 751                 .mode           = 0644,
 752                 .proc_handler   = &proc_dointvec_minmax,
 753                 .strategy       = &sysctl_intvec,
 754                 .extra1         = &zero,
 755                 .extra2         = &one,
 756         },
 757         {
 758                 .ctl_name       = CTL_UNNUMBERED,
 759                 .procname       = "softlockup_thresh",
 760                 .data           = &softlockup_thresh,
 761                 .maxlen         = sizeof(int),
 762                 .mode           = 0644,
 763                 .proc_handler   = &proc_dointvec_minmax,
 764                 .strategy       = &sysctl_intvec,
 765                 .extra1         = &neg_one,
 766                 .extra2         = &sixty,
 767         },
 768         {
 769                 .ctl_name       = CTL_UNNUMBERED,
 770                 .procname       = "hung_task_check_count",
 771                 .data           = &sysctl_hung_task_check_count,
 772                 .maxlen         = sizeof(unsigned long),
 773                 .mode           = 0644,
 774                 .proc_handler   = &proc_doulongvec_minmax,
 775                 .strategy       = &sysctl_intvec,
 776         },
 777         {
 778                 .ctl_name       = CTL_UNNUMBERED,
 779                 .procname       = "hung_task_timeout_secs",
 780                 .data           = &sysctl_hung_task_timeout_secs,
 781                 .maxlen         = sizeof(unsigned long),
 782                 .mode           = 0644,
 783                 .proc_handler   = &proc_doulongvec_minmax,
 784                 .strategy       = &sysctl_intvec,
 785         },
 786         {
 787                 .ctl_name       = CTL_UNNUMBERED,
 788                 .procname       = "hung_task_warnings",
 789                 .data           = &sysctl_hung_task_warnings,
 790                 .maxlen         = sizeof(unsigned long),
 791                 .mode           = 0644,
 792                 .proc_handler   = &proc_doulongvec_minmax,
 793                 .strategy       = &sysctl_intvec,
 794         },
 795 #endif
 796 #ifdef CONFIG_COMPAT
 797         {
 798                 .ctl_name       = KERN_COMPAT_LOG,
 799                 .procname       = "compat-log",
 800                 .data           = &compat_log,
 801                 .maxlen         = sizeof (int),
 802                 .mode           = 0644,
 803                 .proc_handler   = &proc_dointvec,
 804         },
 805 #endif
 806 #ifdef CONFIG_RT_MUTEXES
 807         {
 808                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 809                 .procname       = "max_lock_depth",
 810                 .data           = &max_lock_depth,
 811                 .maxlen         = sizeof(int),
 812                 .mode           = 0644,
 813                 .proc_handler   = &proc_dointvec,
 814         },
 815 #endif
 816 #ifdef CONFIG_PROC_FS
 817         {
 818                 .ctl_name       = CTL_UNNUMBERED,
 819                 .procname       = "maps_protect",
 820                 .data           = &maps_protect,
 821                 .maxlen         = sizeof(int),
 822                 .mode           = 0644,
 823                 .proc_handler   = &proc_dointvec,
 824         },
 825 #endif
 826         {
 827                 .ctl_name       = CTL_UNNUMBERED,
 828                 .procname       = "poweroff_cmd",
 829                 .data           = &poweroff_cmd,
 830                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 831                 .mode           = 0644,
 832                 .proc_handler   = &proc_dostring,
 833                 .strategy       = &sysctl_string,
 834         },
 835 #ifdef CONFIG_KEYS
 836         {
 837                 .ctl_name       = CTL_UNNUMBERED,
 838                 .procname       = "keys",
 839                 .mode           = 0555,
 840                 .child          = key_sysctls,
 841         },
 842 #endif
 843 #ifdef CONFIG_RCU_TORTURE_TEST
 844         {
 845                 .ctl_name       = CTL_UNNUMBERED,
 846                 .procname       = "rcutorture_runnable",
 847                 .data           = &rcutorture_runnable,
 848                 .maxlen         = sizeof(int),
 849                 .mode           = 0644,
 850                 .proc_handler   = &proc_dointvec,
 851         },
 852 #endif
 853 /*
 854  * NOTE: do not add new entries to this table unless you have read
 855  * Documentation/sysctl/ctl_unnumbered.txt
 856  */
 857         { .ctl_name = 0 }
 858 };
 859
 860 static struct ctl_table vm_table[] = {
 861         {
 862                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 863                 .procname       = "overcommit_memory",
 864                 .data           = &sysctl_overcommit_memory,
 865                 .maxlen         = sizeof(sysctl_overcommit_memory),
 866                 .mode           = 0644,
 867                 .proc_handler   = &proc_dointvec,
 868         },
 869         {
 870                 .ctl_name       = VM_PANIC_ON_OOM,
 871                 .procname       = "panic_on_oom",
 872                 .data           = &sysctl_panic_on_oom,
 873                 .maxlen         = sizeof(sysctl_panic_on_oom),
 874                 .mode           = 0644,
 875                 .proc_handler   = &proc_dointvec,
 876         },
 877         {
 878                 .ctl_name       = CTL_UNNUMBERED,
 879                 .procname       = "oom_kill_allocating_task",
 880                 .data           = &sysctl_oom_kill_allocating_task,
 881                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 882                 .mode           = 0644,
 883                 .proc_handler   = &proc_dointvec,
 884         },
 885         {
 886                 .ctl_name       = CTL_UNNUMBERED,
 887                 .procname       = "oom_dump_tasks",
 888                 .data           = &sysctl_oom_dump_tasks,
 889                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 890                 .mode           = 0644,
 891                 .proc_handler   = &proc_dointvec,
 892         },
 893         {
 894                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 895                 .procname       = "overcommit_ratio",
 896                 .data           = &sysctl_overcommit_ratio,
 897                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 898                 .mode           = 0644,
 899                 .proc_handler   = &proc_dointvec,
 900         },
 901         {
 902                 .ctl_name       = VM_PAGE_CLUSTER,
 903                 .procname       = "page-cluster",
 904                 .data           = &page_cluster,
 905                 .maxlen         = sizeof(int),
 906                 .mode           = 0644,
 907                 .proc_handler   = &proc_dointvec,
 908         },
 909         {
 910                 .ctl_name       = VM_DIRTY_BACKGROUND,
 911                 .procname       = "dirty_background_ratio",
 912                 .data           = &dirty_background_ratio,
 913                 .maxlen         = sizeof(dirty_background_ratio),
 914                 .mode           = 0644,
 915                 .proc_handler   = &proc_dointvec_minmax,
 916                 .strategy       = &sysctl_intvec,
 917                 .extra1         = &zero,
 918                 .extra2         = &one_hundred,
 919         },
 920         {
 921                 .ctl_name       = VM_DIRTY_RATIO,
 922                 .procname       = "dirty_ratio",
 923                 .data           = &vm_dirty_ratio,
 924                 .maxlen         = sizeof(vm_dirty_ratio),
 925                 .mode           = 0644,
 926                 .proc_handler   = &dirty_ratio_handler,
 927                 .strategy       = &sysctl_intvec,
 928                 .extra1         = &zero,
 929                 .extra2         = &one_hundred,
 930         },
 931         {
 932                 .procname       = "dirty_writeback_centisecs",
 933                 .data           = &dirty_writeback_interval,
 934                 .maxlen         = sizeof(dirty_writeback_interval),
 935                 .mode           = 0644,
 936                 .proc_handler   = &dirty_writeback_centisecs_handler,
 937         },
 938         {
 939                 .procname       = "dirty_expire_centisecs",
 940                 .data           = &dirty_expire_interval,
 941                 .maxlen         = sizeof(dirty_expire_interval),
 942                 .mode           = 0644,
 943                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 944         },
 945         {
 946                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 947                 .procname       = "nr_pdflush_threads",
 948                 .data           = &nr_pdflush_threads,
 949                 .maxlen         = sizeof nr_pdflush_threads,
 950                 .mode           = 0444 /* read-only*/,
 951                 .proc_handler   = &proc_dointvec,
 952         },
 953         {
 954                 .ctl_name       = VM_SWAPPINESS,
 955                 .procname       = "swappiness",
 956                 .data           = &vm_swappiness,
 957                 .maxlen         = sizeof(vm_swappiness),
 958                 .mode           = 0644,
 959                 .proc_handler   = &proc_dointvec_minmax,
 960                 .strategy       = &sysctl_intvec,
 961                 .extra1         = &zero,
 962                 .extra2         = &one_hundred,
 963         },
 964 #ifdef CONFIG_HUGETLB_PAGE
 965          {
 966                 .procname       = "nr_hugepages",
 967                 .data           = NULL,
 968                 .maxlen         = sizeof(unsigned long),
 969                 .mode           = 0644,
 970                 .proc_handler   = &hugetlb_sysctl_handler,
 971                 .extra1         = (void *)&hugetlb_zero,
 972                 .extra2         = (void *)&hugetlb_infinity,
 973          },
 974          {
 975                 .ctl_name       = VM_HUGETLB_GROUP,
 976                 .procname       = "hugetlb_shm_group",
 977                 .data           = &sysctl_hugetlb_shm_group,
 978                 .maxlen         = sizeof(gid_t),
 979                 .mode           = 0644,
 980                 .proc_handler   = &proc_dointvec,
 981          },
 982          {
 983                 .ctl_name       = CTL_UNNUMBERED,
 984                 .procname       = "hugepages_treat_as_movable",
 985                 .data           = &hugepages_treat_as_movable,
 986                 .maxlen         = sizeof(int),
 987                 .mode           = 0644,
 988                 .proc_handler   = &hugetlb_treat_movable_handler,
 989         },
 990         {
 991                 .ctl_name       = CTL_UNNUMBERED,
 992                 .procname       = "nr_overcommit_hugepages",
 993                 .data           = NULL,
 994                 .maxlen         = sizeof(unsigned long),
 995                 .mode           = 0644,
 996                 .proc_handler   = &hugetlb_overcommit_handler,
 997                 .extra1         = (void *)&hugetlb_zero,
 998                 .extra2         = (void *)&hugetlb_infinity,
 999         },
1000 #endif
1001         {
1002                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
1003                 .procname       = "lowmem_reserve_ratio",
1004                 .data           = &sysctl_lowmem_reserve_ratio,
1005                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1006                 .mode           = 0644,
1007                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1008                 .strategy       = &sysctl_intvec,
1009         },
1010         {
1011                 .ctl_name       = VM_DROP_PAGECACHE,
1012                 .procname       = "drop_caches",
1013                 .data           = &sysctl_drop_caches,
1014                 .maxlen         = sizeof(int),
1015                 .mode           = 0644,
1016                 .proc_handler   = drop_caches_sysctl_handler,
1017                 .strategy       = &sysctl_intvec,
1018         },
1019         {
1020                 .ctl_name       = VM_MIN_FREE_KBYTES,
1021                 .procname       = "min_free_kbytes",
1022                 .data           = &min_free_kbytes,
1023                 .maxlen         = sizeof(min_free_kbytes),
1024                 .mode           = 0644,
1025                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1026                 .strategy       = &sysctl_intvec,
1027                 .extra1         = &zero,
1028         },
1029         {
1030                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1031                 .procname       = "percpu_pagelist_fraction",
1032                 .data           = &percpu_pagelist_fraction,
1033                 .maxlen         = sizeof(percpu_pagelist_fraction),
1034                 .mode           = 0644,
1035                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1036                 .strategy       = &sysctl_intvec,
1037                 .extra1         = &min_percpu_pagelist_fract,
1038         },
1039 #ifdef CONFIG_MMU
1040         {
1041                 .ctl_name       = VM_MAX_MAP_COUNT,
1042                 .procname       = "max_map_count",
1043                 .data           = &sysctl_max_map_count,
1044                 .maxlen         = sizeof(sysctl_max_map_count),
1045                 .mode           = 0644,
1046                 .proc_handler   = &proc_dointvec
1047         },
1048 #endif
1049         {
1050                 .ctl_name       = VM_LAPTOP_MODE,
1051                 .procname       = "laptop_mode",
1052                 .data           = &laptop_mode,
1053                 .maxlen         = sizeof(laptop_mode),
1054                 .mode           = 0644,
1055                 .proc_handler   = &proc_dointvec_jiffies,
1056                 .strategy       = &sysctl_jiffies,
1057         },
1058         {
1059                 .ctl_name       = VM_BLOCK_DUMP,
1060                 .procname       = "block_dump",
1061                 .data           = &block_dump,
1062                 .maxlen         = sizeof(block_dump),
1063                 .mode           = 0644,
1064                 .proc_handler   = &proc_dointvec,
1065                 .strategy       = &sysctl_intvec,
1066                 .extra1         = &zero,
1067         },
1068         {
1069                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1070                 .procname       = "vfs_cache_pressure",
1071                 .data           = &sysctl_vfs_cache_pressure,
1072                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1073                 .mode           = 0644,
1074                 .proc_handler   = &proc_dointvec,
1075                 .strategy       = &sysctl_intvec,
1076                 .extra1         = &zero,
1077         },
1078 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1079         {
1080                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1081                 .procname       = "legacy_va_layout",
1082                 .data           = &sysctl_legacy_va_layout,
1083                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1084                 .mode           = 0644,
1085                 .proc_handler   = &proc_dointvec,
1086                 .strategy       = &sysctl_intvec,
1087                 .extra1         = &zero,
1088         },
1089 #endif
1090 #ifdef CONFIG_NUMA
1091         {
1092                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1093                 .procname       = "zone_reclaim_mode",
1094                 .data           = &zone_reclaim_mode,
1095                 .maxlen         = sizeof(zone_reclaim_mode),
1096                 .mode           = 0644,
1097                 .proc_handler   = &proc_dointvec,
1098                 .strategy       = &sysctl_intvec,
1099                 .extra1         = &zero,
1100         },
1101         {
1102                 .ctl_name       = VM_MIN_UNMAPPED,
1103                 .procname       = "min_unmapped_ratio",
1104                 .data           = &sysctl_min_unmapped_ratio,
1105                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1106                 .mode           = 0644,
1107                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1108                 .strategy       = &sysctl_intvec,
1109                 .extra1         = &zero,
1110                 .extra2         = &one_hundred,
1111         },
1112         {
1113                 .ctl_name       = VM_MIN_SLAB,
1114                 .procname       = "min_slab_ratio",
1115                 .data           = &sysctl_min_slab_ratio,
1116                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1117                 .mode           = 0644,
1118                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1119                 .strategy       = &sysctl_intvec,
1120                 .extra1         = &zero,
1121                 .extra2         = &one_hundred,
1122         },
1123 #endif
1124 #ifdef CONFIG_SMP
1125         {
1126                 .ctl_name       = CTL_UNNUMBERED,
1127                 .procname       = "stat_interval",
1128                 .data           = &sysctl_stat_interval,
1129                 .maxlen         = sizeof(sysctl_stat_interval),
1130                 .mode           = 0644,
1131                 .proc_handler   = &proc_dointvec_jiffies,
1132                 .strategy       = &sysctl_jiffies,
1133         },
1134 #endif
1135         {
1136                 .ctl_name       = CTL_UNNUMBERED,
1137                 .procname       = "mmap_min_addr",
1138                 .data           = &mmap_min_addr,
1139                 .maxlen         = sizeof(unsigned long),
1140                 .mode           = 0644,
1141                 .proc_handler   = &proc_doulongvec_minmax,
1142         },
1143 #ifdef CONFIG_NUMA
1144         {
1145                 .ctl_name       = CTL_UNNUMBERED,
1146                 .procname       = "numa_zonelist_order",
1147                 .data           = &numa_zonelist_order,
1148                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1149                 .mode           = 0644,
1150                 .proc_handler   = &numa_zonelist_order_handler,
1151                 .strategy       = &sysctl_string,
1152         },
1153 #endif
1154 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1155    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1156         {
1157                 .ctl_name       = VM_VDSO_ENABLED,
1158                 .procname       = "vdso_enabled",
1159                 .data           = &vdso_enabled,
1160                 .maxlen         = sizeof(vdso_enabled),
1161                 .mode           = 0644,
1162                 .proc_handler   = &proc_dointvec,
1163                 .strategy       = &sysctl_intvec,
1164                 .extra1         = &zero,
1165         },
1166 #endif
1167 #ifdef CONFIG_HIGHMEM
1168         {
1169                 .ctl_name       = CTL_UNNUMBERED,
1170                 .procname       = "highmem_is_dirtyable",
1171                 .data           = &vm_highmem_is_dirtyable,
1172                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1173                 .mode           = 0644,
1174                 .proc_handler   = &proc_dointvec_minmax,
1175                 .strategy       = &sysctl_intvec,
1176                 .extra1         = &zero,
1177                 .extra2         = &one,
1178         },
1179 #endif
1180 /*
1181  * NOTE: do not add new entries to this table unless you have read
1182  * Documentation/sysctl/ctl_unnumbered.txt
1183  */
1184         { .ctl_name = 0 }
1185 };
1186
1187 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1188 static struct ctl_table binfmt_misc_table[] = {
1189         { .ctl_name = 0 }
1190 };
1191 #endif
1192
1193 static struct ctl_table fs_table[] = {
1194         {
1195                 .ctl_name       = FS_NRINODE,
1196                 .procname       = "inode-nr",
1197                 .data           = &inodes_stat,
1198                 .maxlen         = 2*sizeof(int),
1199                 .mode           = 0444,
1200                 .proc_handler   = &proc_dointvec,
1201         },
1202         {
1203                 .ctl_name       = FS_STATINODE,
1204                 .procname       = "inode-state",
1205                 .data           = &inodes_stat,
1206                 .maxlen         = 7*sizeof(int),
1207                 .mode           = 0444,
1208                 .proc_handler   = &proc_dointvec,
1209         },
1210         {
1211                 .procname       = "file-nr",
1212                 .data           = &files_stat,
1213                 .maxlen         = 3*sizeof(int),
1214                 .mode           = 0444,
1215                 .proc_handler   = &proc_nr_files,
1216         },
1217         {
1218                 .ctl_name       = FS_MAXFILE,
1219                 .procname       = "file-max",
1220                 .data           = &files_stat.max_files,
1221                 .maxlen         = sizeof(int),
1222                 .mode           = 0644,
1223                 .proc_handler   = &proc_dointvec,
1224         },
1225         {
1226                 .ctl_name       = CTL_UNNUMBERED,
1227                 .procname       = "nr_open",
1228                 .data           = &sysctl_nr_open,
1229                 .maxlen         = sizeof(int),
1230                 .mode           = 0644,
1231                 .proc_handler   = &proc_dointvec_minmax,
1232                 .extra1         = &sysctl_nr_open_min,
1233                 .extra2         = &sysctl_nr_open_max,
1234         },
1235         {
1236                 .ctl_name       = FS_DENTRY,
1237                 .procname       = "dentry-state",
1238                 .data           = &dentry_stat,
1239                 .maxlen         = 6*sizeof(int),
1240                 .mode           = 0444,
1241                 .proc_handler   = &proc_dointvec,
1242         },
1243         {
1244                 .ctl_name       = FS_OVERFLOWUID,
1245                 .procname       = "overflowuid",
1246                 .data           = &fs_overflowuid,
1247                 .maxlen         = sizeof(int),
1248                 .mode           = 0644,
1249                 .proc_handler   = &proc_dointvec_minmax,
1250                 .strategy       = &sysctl_intvec,
1251                 .extra1         = &minolduid,
1252                 .extra2         = &maxolduid,
1253         },
1254         {
1255                 .ctl_name       = FS_OVERFLOWGID,
1256                 .procname       = "overflowgid",
1257                 .data           = &fs_overflowgid,
1258                 .maxlen         = sizeof(int),
1259                 .mode           = 0644,
1260                 .proc_handler   = &proc_dointvec_minmax,
1261                 .strategy       = &sysctl_intvec,
1262                 .extra1         = &minolduid,
1263                 .extra2         = &maxolduid,
1264         },
1265         {
1266                 .ctl_name       = FS_LEASES,
1267                 .procname       = "leases-enable",
1268                 .data           = &leases_enable,
1269                 .maxlen         = sizeof(int),
1270                 .mode           = 0644,
1271                 .proc_handler   = &proc_dointvec,
1272         },
1273 #ifdef CONFIG_DNOTIFY
1274         {
1275                 .ctl_name       = FS_DIR_NOTIFY,
1276                 .procname       = "dir-notify-enable",
1277                 .data           = &dir_notify_enable,
1278                 .maxlen         = sizeof(int),
1279                 .mode           = 0644,
1280                 .proc_handler   = &proc_dointvec,
1281         },
1282 #endif
1283 #ifdef CONFIG_MMU
1284         {
1285                 .ctl_name       = FS_LEASE_TIME,
1286                 .procname       = "lease-break-time",
1287                 .data           = &lease_break_time,
1288                 .maxlen         = sizeof(int),
1289                 .mode           = 0644,
1290                 .proc_handler   = &proc_dointvec_minmax,
1291                 .strategy       = &sysctl_intvec,
1292                 .extra1         = &zero,
1293                 .extra2         = &two,
1294         },
1295         {
1296                 .procname       = "aio-nr",
1297                 .data           = &aio_nr,
1298                 .maxlen         = sizeof(aio_nr),
1299                 .mode           = 0444,
1300                 .proc_handler   = &proc_doulongvec_minmax,
1301         },
1302         {
1303                 .procname       = "aio-max-nr",
1304                 .data           = &aio_max_nr,
1305                 .maxlen         = sizeof(aio_max_nr),
1306                 .mode           = 0644,
1307                 .proc_handler   = &proc_doulongvec_minmax,
1308         },
1309 #ifdef CONFIG_INOTIFY_USER
1310         {
1311                 .ctl_name       = FS_INOTIFY,
1312                 .procname       = "inotify",
1313                 .mode           = 0555,
1314                 .child          = inotify_table,
1315         },
1316 #endif
1317 #ifdef CONFIG_EPOLL
1318         {
1319                 .procname       = "epoll",
1320                 .mode           = 0555,
1321                 .child          = epoll_table,
1322         },
1323 #endif
1324 #endif
1325         {
1326                 .ctl_name       = KERN_SETUID_DUMPABLE,
1327                 .procname       = "suid_dumpable",
1328                 .data           = &suid_dumpable,
1329                 .maxlen         = sizeof(int),
1330                 .mode           = 0644,
1331                 .proc_handler   = &proc_dointvec,
1332         },
1333 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1334         {
1335                 .ctl_name       = CTL_UNNUMBERED,
1336                 .procname       = "binfmt_misc",
1337                 .mode           = 0555,
1338                 .child          = binfmt_misc_table,
1339         },
1340 #endif
1341 /*
1342  * NOTE: do not add new entries to this table unless you have read
1343  * Documentation/sysctl/ctl_unnumbered.txt
1344  */
1345         { .ctl_name = 0 }
1346 };
1347
1348 static struct ctl_table debug_table[] = {
1349 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1350         {
1351                 .ctl_name       = CTL_UNNUMBERED,
1352                 .procname       = "exception-trace",
1353                 .data           = &show_unhandled_signals,
1354                 .maxlen         = sizeof(int),
1355                 .mode           = 0644,
1356                 .proc_handler   = proc_dointvec
1357         },
1358 #endif
1359         { .ctl_name = 0 }
1360 };
1361
1362 static struct ctl_table dev_table[] = {
1363         { .ctl_name = 0 }
1364 };
1365
1366 static DEFINE_SPINLOCK(sysctl_lock);
1367
1368 /* called under sysctl_lock */
1369 static int use_table(struct ctl_table_header *p)
1370 {
1371         if (unlikely(p->unregistering))
1372                 return 0;
1373         p->used++;
1374         return 1;
1375 }
1376
1377 /* called under sysctl_lock */
1378 static void unuse_table(struct ctl_table_header *p)
1379 {
1380         if (!--p->used)
1381                 if (unlikely(p->unregistering))
1382                         complete(p->unregistering);
1383 }
1384
1385 /* called under sysctl_lock, will reacquire if has to wait */
1386 static void start_unregistering(struct ctl_table_header *p)
1387 {
1388         /*
1389          * if p->used is 0, nobody will ever touch that entry again;
1390          * we'll eliminate all paths to it before dropping sysctl_lock
1391          */
1392         if (unlikely(p->used)) {
1393                 struct completion wait;
1394                 init_completion(&wait);
1395                 p->unregistering = &wait;
1396                 spin_unlock(&sysctl_lock);
1397                 wait_for_completion(&wait);
1398                 spin_lock(&sysctl_lock);
1399         } else {
1400                 /* anything non-NULL; we'll never dereference it */
1401                 p->unregistering = ERR_PTR(-EINVAL);
1402         }
1403         /*
1404          * do not remove from the list until nobody holds it; walking the
1405          * list in do_sysctl() relies on that.
1406          */
1407         list_del_init(&p->ctl_entry);
1408 }
1409
1410 void sysctl_head_get(struct ctl_table_header *head)
1411 {
1412         spin_lock(&sysctl_lock);
1413         head->count++;
1414         spin_unlock(&sysctl_lock);
1415 }
1416
1417 void sysctl_head_put(struct ctl_table_header *head)
1418 {
1419         spin_lock(&sysctl_lock);
1420         if (!--head->count)
1421                 kfree(head);
1422         spin_unlock(&sysctl_lock);
1423 }
1424
1425 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1426 {
1427         if (!head)
1428                 BUG();
1429         spin_lock(&sysctl_lock);
1430         if (!use_table(head))
1431                 head = ERR_PTR(-ENOENT);
1432         spin_unlock(&sysctl_lock);
1433         return head;
1434 }
1435
1436 void sysctl_head_finish(struct ctl_table_header *head)
1437 {
1438         if (!head)
1439                 return;
1440         spin_lock(&sysctl_lock);
1441         unuse_table(head);
1442         spin_unlock(&sysctl_lock);
1443 }
1444
1445 static struct ctl_table_set *
1446 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1447 {
1448         struct ctl_table_set *set = &root->default_set;
1449         if (root->lookup)
1450                 set = root->lookup(root, namespaces);
1451         return set;
1452 }
1453
1454 static struct list_head *
1455 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1456 {
1457         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1458         return &set->list;
1459 }
1460
1461 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1462                                             struct ctl_table_header *prev)
1463 {
1464         struct ctl_table_root *root;
1465         struct list_head *header_list;
1466         struct ctl_table_header *head;
1467         struct list_head *tmp;
1468
1469         spin_lock(&sysctl_lock);
1470         if (prev) {
1471                 head = prev;
1472                 tmp = &prev->ctl_entry;
1473                 unuse_table(prev);
1474                 goto next;
1475         }
1476         tmp = &root_table_header.ctl_entry;
1477         for (;;) {
1478                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1479
1480                 if (!use_table(head))
1481                         goto next;
1482                 spin_unlock(&sysctl_lock);
1483                 return head;
1484         next:
1485                 root = head->root;
1486                 tmp = tmp->next;
1487                 header_list = lookup_header_list(root, namespaces);
1488                 if (tmp != header_list)
1489                         continue;
1490
1491                 do {
1492                         root = list_entry(root->root_list.next,
1493                                         struct ctl_table_root, root_list);
1494                         if (root == &sysctl_table_root)
1495                                 goto out;
1496                         header_list = lookup_header_list(root, namespaces);
1497                 } while (list_empty(header_list));
1498                 tmp = header_list->next;
1499         }
1500 out:
1501         spin_unlock(&sysctl_lock);
1502         return NULL;
1503 }
1504
1505 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1506 {
1507         return __sysctl_head_next(current->nsproxy, prev);
1508 }
1509
1510 void register_sysctl_root(struct ctl_table_root *root)
1511 {
1512         spin_lock(&sysctl_lock);
1513         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1514         spin_unlock(&sysctl_lock);
1515 }
1516
1517 #ifdef CONFIG_SYSCTL_SYSCALL
1518 /* Perform the actual read/write of a sysctl table entry. */
1519 static int do_sysctl_strategy(struct ctl_table_root *root,
1520                         struct ctl_table *table,
1521                         int __user *name, int nlen,
1522                         void __user *oldval, size_t __user *oldlenp,
1523                         void __user *newval, size_t newlen)
1524 {
1525         int op = 0, rc;
1526
1527         if (oldval)
1528                 op |= MAY_READ;
1529         if (newval)
1530                 op |= MAY_WRITE;
1531         if (sysctl_perm(root, table, op))
1532                 return -EPERM;
1533
1534         if (table->strategy) {
1535                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1536                                      newval, newlen);
1537                 if (rc < 0)
1538                         return rc;
1539                 if (rc > 0)
1540                         return 0;
1541         }
1542
1543         /* If there is no strategy routine, or if the strategy returns
1544          * zero, proceed with automatic r/w */
1545         if (table->data && table->maxlen) {
1546                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1547                                  newval, newlen);
1548                 if (rc < 0)
1549                         return rc;
1550         }
1551         return 0;
1552 }
1553
1554 static int parse_table(int __user *name, int nlen,
1555                        void __user *oldval, size_t __user *oldlenp,
1556                        void __user *newval, size_t newlen,
1557                        struct ctl_table_root *root,
1558                        struct ctl_table *table)
1559 {
1560         int n;
1561 repeat:
1562         if (!nlen)
1563                 return -ENOTDIR;
1564         if (get_user(n, name))
1565                 return -EFAULT;
1566         for ( ; table->ctl_name || table->procname; table++) {
1567                 if (!table->ctl_name)
1568                         continue;
1569                 if (n == table->ctl_name) {
1570                         int error;
1571                         if (table->child) {
1572                                 if (sysctl_perm(root, table, MAY_EXEC))
1573                                         return -EPERM;
1574                                 name++;
1575                                 nlen--;
1576                                 table = table->child;
1577                                 goto repeat;
1578                         }
1579                         error = do_sysctl_strategy(root, table, name, nlen,
1580                                                    oldval, oldlenp,
1581                                                    newval, newlen);
1582                         return error;
1583                 }
1584         }
1585         return -ENOTDIR;
1586 }
1587
1588 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1589                void __user *newval, size_t newlen)
1590 {
1591         struct ctl_table_header *head;
1592         int error = -ENOTDIR;
1593
1594         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1595                 return -ENOTDIR;
1596         if (oldval) {
1597                 int old_len;
1598                 if (!oldlenp || get_user(old_len, oldlenp))
1599                         return -EFAULT;
1600         }
1601
1602         for (head = sysctl_head_next(NULL); head;
1603                         head = sysctl_head_next(head)) {
1604                 error = parse_table(name, nlen, oldval, oldlenp,
1605                                         newval, newlen,
1606                                         head->root, head->ctl_table);
1607                 if (error != -ENOTDIR) {
1608                         sysctl_head_finish(head);
1609                         break;
1610                 }
1611         }
1612         return error;
1613 }
1614
1615 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1616 {
1617         struct __sysctl_args tmp;
1618         int error;
1619
1620         if (copy_from_user(&tmp, args, sizeof(tmp)))
1621                 return -EFAULT;
1622
1623         error = deprecated_sysctl_warning(&tmp);
1624         if (error)
1625                 goto out;
1626
1627         lock_kernel();
1628         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1629                           tmp.newval, tmp.newlen);
1630         unlock_kernel();
1631 out:
1632         return error;
1633 }
1634 #endif /* CONFIG_SYSCTL_SYSCALL */
1635
1636 /*
1637  * sysctl_perm does NOT grant the superuser all rights automatically, because
1638  * some sysctl variables are readonly even to root.
1639  */
1640
1641 static int test_perm(int mode, int op)
1642 {
1643         if (!current->euid)
1644                 mode >>= 6;
1645         else if (in_egroup_p(0))
1646                 mode >>= 3;
1647         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1648                 return 0;
1649         return -EACCES;
1650 }
1651
1652 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1653 {
1654         int error;
1655         int mode;
1656
1657         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1658         if (error)
1659                 return error;
1660
1661         if (root->permissions)
1662                 mode = root->permissions(root, current->nsproxy, table);
1663         else
1664                 mode = table->mode;
1665
1666         return test_perm(mode, op);
1667 }
1668
1669 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1670 {
1671         for (; table->ctl_name || table->procname; table++) {
1672                 table->parent = parent;
1673                 if (table->child)
1674                         sysctl_set_parent(table, table->child);
1675         }
1676 }
1677
1678 static __init int sysctl_init(void)
1679 {
1680         sysctl_set_parent(NULL, root_table);
1681 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1682         {
1683                 int err;
1684                 err = sysctl_check_table(current->nsproxy, root_table);
1685         }
1686 #endif
1687         return 0;
1688 }
1689
1690 core_initcall(sysctl_init);
1691
1692 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1693                                       struct ctl_table *table)
1694 {
1695         struct ctl_table *p;
1696         const char *s = branch->procname;
1697
1698         /* branch should have named subdirectory as its first element */
1699         if (!s || !branch->child)
1700                 return NULL;
1701
1702         /* ... and nothing else */
1703         if (branch[1].procname || branch[1].ctl_name)
1704                 return NULL;
1705
1706         /* table should contain subdirectory with the same name */
1707         for (p = table; p->procname || p->ctl_name; p++) {
1708                 if (!p->child)
1709                         continue;
1710                 if (p->procname && strcmp(p->procname, s) == 0)
1711                         return p;
1712         }
1713         return NULL;
1714 }
1715
1716 /* see if attaching q to p would be an improvement */
1717 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1718 {
1719         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1720         struct ctl_table *next;
1721         int is_better = 0;
1722         int not_in_parent = !p->attached_by;
1723
1724         while ((next = is_branch_in(by, to)) != NULL) {
1725                 if (by == q->attached_by)
1726                         is_better = 1;
1727                 if (to == p->attached_by)
1728                         not_in_parent = 1;
1729                 by = by->child;
1730                 to = next->child;
1731         }
1732
1733         if (is_better && not_in_parent) {
1734                 q->attached_by = by;
1735                 q->attached_to = to;
1736                 q->parent = p;
1737         }
1738 }
1739
1740 /**
1741  * __register_sysctl_paths - register a sysctl hierarchy
1742  * @root: List of sysctl headers to register on
1743  * @namespaces: Data to compute which lists of sysctl entries are visible
1744  * @path: The path to the directory the sysctl table is in.
1745  * @table: the top-level table structure
1746  *
1747  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1748  * array. A completely 0 filled entry terminates the table.
1749  *
1750  * The members of the &struct ctl_table structure are used as follows:
1751  *
1752  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1753  *            must be unique within that level of sysctl
1754  *
1755  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1756  *            enter a sysctl file
1757  *
1758  * data - a pointer to data for use by proc_handler
1759  *
1760  * maxlen - the maximum size in bytes of the data
1761  *
1762  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1763  *
1764  * child - a pointer to the child sysctl table if this entry is a directory, or
1765  *         %NULL.
1766  *
1767  * proc_handler - the text handler routine (described below)
1768  *
1769  * strategy - the strategy routine (described below)
1770  *
1771  * de - for internal use by the sysctl routines
1772  *
1773  * extra1, extra2 - extra pointers usable by the proc handler routines
1774  *
1775  * Leaf nodes in the sysctl tree will be represented by a single file
1776  * under /proc; non-leaf nodes will be represented by directories.
1777  *
1778  * sysctl(2) can automatically manage read and write requests through
1779  * the sysctl table.  The data and maxlen fields of the ctl_table
1780  * struct enable minimal validation of the values being written to be
1781  * performed, and the mode field allows minimal authentication.
1782  *
1783  * More sophisticated management can be enabled by the provision of a
1784  * strategy routine with the table entry.  This will be called before
1785  * any automatic read or write of the data is performed.
1786  *
1787  * The strategy routine may return
1788  *
1789  * < 0 - Error occurred (error is passed to user process)
1790  *
1791  * 0   - OK - proceed with automatic read or write.
1792  *
1793  * > 0 - OK - read or write has been done by the strategy routine, so
1794  *       return immediately.
1795  *
1796  * There must be a proc_handler routine for any terminal nodes
1797  * mirrored under /proc/sys (non-terminals are handled by a built-in
1798  * directory handler).  Several default handlers are available to
1799  * cover common cases -
1800  *
1801  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1802  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1803  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1804  *
1805  * It is the handler's job to read the input buffer from user memory
1806  * and process it. The handler should return 0 on success.
1807  *
1808  * This routine returns %NULL on a failure to register, and a pointer
1809  * to the table header on success.
1810  */
1811 struct ctl_table_header *__register_sysctl_paths(
1812         struct ctl_table_root *root,
1813         struct nsproxy *namespaces,
1814         const struct ctl_path *path, struct ctl_table *table)
1815 {
1816         struct ctl_table_header *header;
1817         struct ctl_table *new, **prevp;
1818         unsigned int n, npath;
1819         struct ctl_table_set *set;
1820
1821         /* Count the path components */
1822         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1823                 ;
1824
1825         /*
1826          * For each path component, allocate a 2-element ctl_table array.
1827          * The first array element will be filled with the sysctl entry
1828          * for this, the second will be the sentinel (ctl_name == 0).
1829          *
1830          * We allocate everything in one go so that we don't have to
1831          * worry about freeing additional memory in unregister_sysctl_table.
1832          */
1833         header = kzalloc(sizeof(struct ctl_table_header) +
1834                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1835         if (!header)
1836                 return NULL;
1837
1838         new = (struct ctl_table *) (header + 1);
1839
1840         /* Now connect the dots */
1841         prevp = &header->ctl_table;
1842         for (n = 0; n < npath; ++n, ++path) {
1843                 /* Copy the procname */
1844                 new->procname = path->procname;
1845                 new->ctl_name = path->ctl_name;
1846                 new->mode     = 0555;
1847
1848                 *prevp = new;
1849                 prevp = &new->child;
1850
1851                 new += 2;
1852         }
1853         *prevp = table;
1854         header->ctl_table_arg = table;
1855
1856         INIT_LIST_HEAD(&header->ctl_entry);
1857         header->used = 0;
1858         header->unregistering = NULL;
1859         header->root = root;
1860         sysctl_set_parent(NULL, header->ctl_table);
1861         header->count = 1;
1862 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1863         if (sysctl_check_table(namespaces, header->ctl_table)) {
1864                 kfree(header);
1865                 return NULL;
1866         }
1867 #endif
1868         spin_lock(&sysctl_lock);
1869         header->set = lookup_header_set(root, namespaces);
1870         header->attached_by = header->ctl_table;
1871         header->attached_to = root_table;
1872         header->parent = &root_table_header;
1873         for (set = header->set; set; set = set->parent) {
1874                 struct ctl_table_header *p;
1875                 list_for_each_entry(p, &set->list, ctl_entry) {
1876                         if (p->unregistering)
1877                                 continue;
1878                         try_attach(p, header);
1879                 }
1880         }
1881         header->parent->count++;
1882         list_add_tail(&header->ctl_entry, &header->set->list);
1883         spin_unlock(&sysctl_lock);
1884
1885         return header;
1886 }
1887
1888 /**
1889  * register_sysctl_table_path - register a sysctl table hierarchy
1890  * @path: The path to the directory the sysctl table is in.
1891  * @table: the top-level table structure
1892  *
1893  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1894  * array. A completely 0 filled entry terminates the table.
1895  *
1896  * See __register_sysctl_paths for more details.
1897  */
1898 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1899                                                 struct ctl_table *table)
1900 {
1901         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1902                                         path, table);
1903 }
1904
1905 /**
1906  * register_sysctl_table - register a sysctl table hierarchy
1907  * @table: the top-level table structure
1908  *
1909  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1910  * array. A completely 0 filled entry terminates the table.
1911  *
1912  * See register_sysctl_paths for more details.
1913  */
1914 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1915 {
1916         static const struct ctl_path null_path[] = { {} };
1917
1918         return register_sysctl_paths(null_path, table);
1919 }
1920
1921 /**
1922  * unregister_sysctl_table - unregister a sysctl table hierarchy
1923  * @header: the header returned from register_sysctl_table
1924  *
1925  * Unregisters the sysctl table and all children. proc entries may not
1926  * actually be removed until they are no longer used by anyone.
1927  */
1928 void unregister_sysctl_table(struct ctl_table_header * header)
1929 {
1930         might_sleep();
1931
1932         if (header == NULL)
1933                 return;
1934
1935         spin_lock(&sysctl_lock);
1936         start_unregistering(header);
1937         if (!--header->parent->count) {
1938                 WARN_ON(1);
1939                 kfree(header->parent);
1940         }
1941         if (!--header->count)
1942                 kfree(header);
1943         spin_unlock(&sysctl_lock);
1944 }
1945
1946 int sysctl_is_seen(struct ctl_table_header *p)
1947 {
1948         struct ctl_table_set *set = p->set;
1949         int res;
1950         spin_lock(&sysctl_lock);
1951         if (p->unregistering)
1952                 res = 0;
1953         else if (!set->is_seen)
1954                 res = 1;
1955         else
1956                 res = set->is_seen(set);
1957         spin_unlock(&sysctl_lock);
1958         return res;
1959 }
1960
1961 void setup_sysctl_set(struct ctl_table_set *p,
1962         struct ctl_table_set *parent,
1963         int (*is_seen)(struct ctl_table_set *))
1964 {
1965         INIT_LIST_HEAD(&p->list);
1966         p->parent = parent ? parent : &sysctl_table_root.default_set;
1967         p->is_seen = is_seen;
1968 }
1969
1970 #else /* !CONFIG_SYSCTL */
1971 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1972 {
1973         return NULL;
1974 }
1975
1976 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1977                                                     struct ctl_table *table)
1978 {
1979         return NULL;
1980 }
1981
1982 void unregister_sysctl_table(struct ctl_table_header * table)
1983 {
1984 }
1985
1986 void setup_sysctl_set(struct ctl_table_set *p,
1987         struct ctl_table_set *parent,
1988         int (*is_seen)(struct ctl_table_set *))
1989 {
1990 }
1991
1992 void sysctl_head_put(struct ctl_table_header *head)
1993 {
1994 }
1995
1996 #endif /* CONFIG_SYSCTL */
1997
1998 /*
1999  * /proc/sys support
2000  */
2001
2002 #ifdef CONFIG_PROC_SYSCTL
2003
2004 static int _proc_do_string(void* data, int maxlen, int write,
2005                            struct file *filp, void __user *buffer,
2006                            size_t *lenp, loff_t *ppos)
2007 {
2008         size_t len;
2009         char __user *p;
2010         char c;
2011
2012         if (!data || !maxlen || !*lenp) {
2013                 *lenp = 0;
2014                 return 0;
2015         }
2016
2017         if (write) {
2018                 len = 0;
2019                 p = buffer;
2020                 while (len < *lenp) {
2021                         if (get_user(c, p++))
2022                                 return -EFAULT;
2023                         if (c == 0 || c == '\n')
2024                                 break;
2025                         len++;
2026                 }
2027                 if (len >= maxlen)
2028                         len = maxlen-1;
2029                 if(copy_from_user(data, buffer, len))
2030                         return -EFAULT;
2031                 ((char *) data)[len] = 0;
2032                 *ppos += *lenp;
2033         } else {
2034                 len = strlen(data);
2035                 if (len > maxlen)
2036                         len = maxlen;
2037
2038                 if (*ppos > len) {
2039                         *lenp = 0;
2040                         return 0;
2041                 }
2042
2043                 data += *ppos;
2044                 len  -= *ppos;
2045
2046                 if (len > *lenp)
2047                         len = *lenp;
2048                 if (len)
2049                         if(copy_to_user(buffer, data, len))
2050                                 return -EFAULT;
2051                 if (len < *lenp) {
2052                         if(put_user('\n', ((char __user *) buffer) + len))
2053                                 return -EFAULT;
2054                         len++;
2055                 }
2056                 *lenp = len;
2057                 *ppos += len;
2058         }
2059         return 0;
2060 }
2061
2062 /**
2063  * proc_dostring - read a string sysctl
2064  * @table: the sysctl table
2065  * @write: %TRUE if this is a write to the sysctl file
2066  * @filp: the file structure
2067  * @buffer: the user buffer
2068  * @lenp: the size of the user buffer
2069  * @ppos: file position
2070  *
2071  * Reads/writes a string from/to the user buffer. If the kernel
2072  * buffer provided is not large enough to hold the string, the
2073  * string is truncated. The copied string is %NULL-terminated.
2074  * If the string is being read by the user process, it is copied
2075  * and a newline '\n' is added. It is truncated if the buffer is
2076  * not large enough.
2077  *
2078  * Returns 0 on success.
2079  */
2080 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2081                   void __user *buffer, size_t *lenp, loff_t *ppos)
2082 {
2083         return _proc_do_string(table->data, table->maxlen, write, filp,
2084                                buffer, lenp, ppos);
2085 }
2086
2087
2088 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2089                                  int *valp,
2090                                  int write, void *data)
2091 {
2092         if (write) {
2093                 *valp = *negp ? -*lvalp : *lvalp;
2094         } else {
2095                 int val = *valp;
2096                 if (val < 0) {
2097                         *negp = -1;
2098                         *lvalp = (unsigned long)-val;
2099                 } else {
2100                         *negp = 0;
2101                         *lvalp = (unsigned long)val;
2102                 }
2103         }
2104         return 0;
2105 }
2106
2107 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2108                   int write, struct file *filp, void __user *buffer,
2109                   size_t *lenp, loff_t *ppos,
2110                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2111                               int write, void *data),
2112                   void *data)
2113 {
2114 #define TMPBUFLEN 21
2115         int *i, vleft, first=1, neg, val;
2116         unsigned long lval;
2117         size_t left, len;
2118
2119         char buf[TMPBUFLEN], *p;
2120         char __user *s = buffer;
2121
2122         if (!tbl_data || !table->maxlen || !*lenp ||
2123             (*ppos && !write)) {
2124                 *lenp = 0;
2125                 return 0;
2126         }
2127
2128         i = (int *) tbl_data;
2129         vleft = table->maxlen / sizeof(*i);
2130         left = *lenp;
2131
2132         if (!conv)
2133                 conv = do_proc_dointvec_conv;
2134
2135         for (; left && vleft--; i++, first=0) {
2136                 if (write) {
2137                         while (left) {
2138                                 char c;
2139                                 if (get_user(c, s))
2140                                         return -EFAULT;
2141                                 if (!isspace(c))
2142                                         break;
2143                                 left--;
2144                                 s++;
2145                         }
2146                         if (!left)
2147                                 break;
2148                         neg = 0;
2149                         len = left;
2150                         if (len > sizeof(buf) - 1)
2151                                 len = sizeof(buf) - 1;
2152                         if (copy_from_user(buf, s, len))
2153                                 return -EFAULT;
2154                         buf[len] = 0;
2155                         p = buf;
2156                         if (*p == '-' && left > 1) {
2157                                 neg = 1;
2158                                 p++;
2159                         }
2160                         if (*p < '0' || *p > '9')
2161                                 break;
2162
2163                         lval = simple_strtoul(p, &p, 0);
2164
2165                         len = p-buf;
2166                         if ((len < left) && *p && !isspace(*p))
2167                                 break;
2168                         if (neg)
2169                                 val = -val;
2170                         s += len;
2171                         left -= len;
2172
2173                         if (conv(&neg, &lval, i, 1, data))
2174                                 break;
2175                 } else {
2176                         p = buf;
2177                         if (!first)
2178                                 *p++ = '\t';
2179
2180                         if (conv(&neg, &lval, i, 0, data))
2181                                 break;
2182
2183                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2184                         len = strlen(buf);
2185                         if (len > left)
2186                                 len = left;
2187                         if(copy_to_user(s, buf, len))
2188                                 return -EFAULT;
2189                         left -= len;
2190                         s += len;
2191                 }
2192         }
2193
2194         if (!write && !first && left) {
2195                 if(put_user('\n', s))
2196                         return -EFAULT;
2197                 left--, s++;
2198         }
2199         if (write) {
2200                 while (left) {
2201                         char c;
2202                         if (get_user(c, s++))
2203                                 return -EFAULT;
2204                         if (!isspace(c))
2205                                 break;
2206                         left--;
2207                 }
2208         }
2209         if (write && first)
2210                 return -EINVAL;
2211         *lenp -= left;
2212         *ppos += *lenp;
2213         return 0;
2214 #undef TMPBUFLEN
2215 }
2216
2217 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2218                   void __user *buffer, size_t *lenp, loff_t *ppos,
2219                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2220                               int write, void *data),
2221                   void *data)
2222 {
2223         return __do_proc_dointvec(table->data, table, write, filp,
2224                         buffer, lenp, ppos, conv, data);
2225 }
2226
2227 /**
2228  * proc_dointvec - read a vector of integers
2229  * @table: the sysctl table
2230  * @write: %TRUE if this is a write to the sysctl file
2231  * @filp: the file structure
2232  * @buffer: the user buffer
2233  * @lenp: the size of the user buffer
2234  * @ppos: file position
2235  *
2236  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2237  * values from/to the user buffer, treated as an ASCII string.
2238  *
2239  * Returns 0 on success.
2240  */
2241 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2242                      void __user *buffer, size_t *lenp, loff_t *ppos)
2243 {
2244     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2245                             NULL,NULL);
2246 }
2247
2248 #define OP_SET  0
2249 #define OP_AND  1
2250 #define OP_OR   2
2251
2252 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2253                                       int *valp,
2254                                       int write, void *data)
2255 {
2256         int op = *(int *)data;
2257         if (write) {
2258                 int val = *negp ? -*lvalp : *lvalp;
2259                 switch(op) {
2260                 case OP_SET:    *valp = val; break;
2261                 case OP_AND:    *valp &= val; break;
2262                 case OP_OR:     *valp |= val; break;
2263                 }
2264         } else {
2265                 int val = *valp;
2266                 if (val < 0) {
2267                         *negp = -1;
2268                         *lvalp = (unsigned long)-val;
2269                 } else {
2270                         *negp = 0;
2271                         *lvalp = (unsigned long)val;
2272                 }
2273         }
2274         return 0;
2275 }
2276
2277 /*
2278  *      Taint values can only be increased
2279  */
2280 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2281                                void __user *buffer, size_t *lenp, loff_t *ppos)
2282 {
2283         int op;
2284
2285         if (write && !capable(CAP_SYS_ADMIN))
2286                 return -EPERM;
2287
2288         op = OP_OR;
2289         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2290                                 do_proc_dointvec_bset_conv,&op);
2291 }
2292
2293 struct do_proc_dointvec_minmax_conv_param {
2294         int *min;
2295         int *max;
2296 };
2297
2298 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2299                                         int *valp,
2300                                         int write, void *data)
2301 {
2302         struct do_proc_dointvec_minmax_conv_param *param = data;
2303         if (write) {
2304                 int val = *negp ? -*lvalp : *lvalp;
2305                 if ((param->min && *param->min > val) ||
2306                     (param->max && *param->max < val))
2307                         return -EINVAL;
2308                 *valp = val;
2309         } else {
2310                 int val = *valp;
2311                 if (val < 0) {
2312                         *negp = -1;
2313                         *lvalp = (unsigned long)-val;
2314                 } else {
2315                         *negp = 0;
2316                         *lvalp = (unsigned long)val;
2317                 }
2318         }
2319         return 0;
2320 }
2321
2322 /**
2323  * proc_dointvec_minmax - read a vector of integers with min/max values
2324  * @table: the sysctl table
2325  * @write: %TRUE if this is a write to the sysctl file
2326  * @filp: the file structure
2327  * @buffer: the user buffer
2328  * @lenp: the size of the user buffer
2329  * @ppos: file position
2330  *
2331  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2332  * values from/to the user buffer, treated as an ASCII string.
2333  *
2334  * This routine will ensure the values are within the range specified by
2335  * table->extra1 (min) and table->extra2 (max).
2336  *
2337  * Returns 0 on success.
2338  */
2339 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2340                   void __user *buffer, size_t *lenp, loff_t *ppos)
2341 {
2342         struct do_proc_dointvec_minmax_conv_param param = {
2343                 .min = (int *) table->extra1,
2344                 .max = (int *) table->extra2,
2345         };
2346         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2347                                 do_proc_dointvec_minmax_conv, &param);
2348 }
2349
2350 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2351                                      struct file *filp,
2352                                      void __user *buffer,
2353                                      size_t *lenp, loff_t *ppos,
2354                                      unsigned long convmul,
2355                                      unsigned long convdiv)
2356 {
2357 #define TMPBUFLEN 21
2358         unsigned long *i, *min, *max, val;
2359         int vleft, first=1, neg;
2360         size_t len, left;
2361         char buf[TMPBUFLEN], *p;
2362         char __user *s = buffer;
2363
2364         if (!data || !table->maxlen || !*lenp ||
2365             (*ppos && !write)) {
2366                 *lenp = 0;
2367                 return 0;
2368         }
2369
2370         i = (unsigned long *) data;
2371         min = (unsigned long *) table->extra1;
2372         max = (unsigned long *) table->extra2;
2373         vleft = table->maxlen / sizeof(unsigned long);
2374         left = *lenp;
2375
2376         for (; left && vleft--; i++, min++, max++, first=0) {
2377                 if (write) {
2378                         while (left) {
2379                                 char c;
2380                                 if (get_user(c, s))
2381                                         return -EFAULT;
2382                                 if (!isspace(c))
2383                                         break;
2384                                 left--;
2385                                 s++;
2386                         }
2387                         if (!left)
2388                                 break;
2389                         neg = 0;
2390                         len = left;
2391                         if (len > TMPBUFLEN-1)
2392                                 len = TMPBUFLEN-1;
2393                         if (copy_from_user(buf, s, len))
2394                                 return -EFAULT;
2395                         buf[len] = 0;
2396                         p = buf;
2397                         if (*p == '-' && left > 1) {
2398                                 neg = 1;
2399                                 p++;
2400                         }
2401                         if (*p < '0' || *p > '9')
2402                                 break;
2403                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2404                         len = p-buf;
2405                         if ((len < left) && *p && !isspace(*p))
2406                                 break;
2407                         if (neg)
2408                                 val = -val;
2409                         s += len;
2410                         left -= len;
2411
2412                         if(neg)
2413                                 continue;
2414                         if ((min && val < *min) || (max && val > *max))
2415                                 continue;
2416                         *i = val;
2417                 } else {
2418                         p = buf;
2419                         if (!first)
2420                                 *p++ = '\t';
2421                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2422                         len = strlen(buf);
2423                         if (len > left)
2424                                 len = left;
2425                         if(copy_to_user(s, buf, len))
2426                                 return -EFAULT;
2427                         left -= len;
2428                         s += len;
2429                 }
2430         }
2431
2432         if (!write && !first && left) {
2433                 if(put_user('\n', s))
2434                         return -EFAULT;
2435                 left--, s++;
2436         }
2437         if (write) {
2438                 while (left) {
2439                         char c;
2440                         if (get_user(c, s++))
2441                                 return -EFAULT;
2442                         if (!isspace(c))
2443                                 break;
2444                         left--;
2445                 }
2446         }
2447         if (write && first)
2448                 return -EINVAL;
2449         *lenp -= left;
2450         *ppos += *lenp;
2451         return 0;
2452 #undef TMPBUFLEN
2453 }
2454
2455 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2456                                      struct file *filp,
2457                                      void __user *buffer,
2458                                      size_t *lenp, loff_t *ppos,
2459                                      unsigned long convmul,
2460                                      unsigned long convdiv)
2461 {
2462         return __do_proc_doulongvec_minmax(table->data, table, write,
2463                         filp, buffer, lenp, ppos, convmul, convdiv);
2464 }
2465
2466 /**
2467  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2468  * @table: the sysctl table
2469  * @write: %TRUE if this is a write to the sysctl file
2470  * @filp: the file structure
2471  * @buffer: the user buffer
2472  * @lenp: the size of the user buffer
2473  * @ppos: file position
2474  *
2475  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2476  * values from/to the user buffer, treated as an ASCII string.
2477  *
2478  * This routine will ensure the values are within the range specified by
2479  * table->extra1 (min) and table->extra2 (max).
2480  *
2481  * Returns 0 on success.
2482  */
2483 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2484                            void __user *buffer, size_t *lenp, loff_t *ppos)
2485 {
2486     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2487 }
2488
2489 /**
2490  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2491  * @table: the sysctl table
2492  * @write: %TRUE if this is a write to the sysctl file
2493  * @filp: the file structure
2494  * @buffer: the user buffer
2495  * @lenp: the size of the user buffer
2496  * @ppos: file position
2497  *
2498  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2499  * values from/to the user buffer, treated as an ASCII string. The values
2500  * are treated as milliseconds, and converted to jiffies when they are stored.
2501  *
2502  * This routine will ensure the values are within the range specified by
2503  * table->extra1 (min) and table->extra2 (max).
2504  *
2505  * Returns 0 on success.
2506  */
2507 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2508                                       struct file *filp,
2509                                       void __user *buffer,
2510                                       size_t *lenp, loff_t *ppos)
2511 {
2512     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2513                                      lenp, ppos, HZ, 1000l);
2514 }
2515
2516
2517 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2518                                          int *valp,
2519                                          int write, void *data)
2520 {
2521         if (write) {
2522                 if (*lvalp > LONG_MAX / HZ)
2523                         return 1;
2524                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2525         } else {
2526                 int val = *valp;
2527                 unsigned long lval;
2528                 if (val < 0) {
2529                         *negp = -1;
2530                         lval = (unsigned long)-val;
2531                 } else {
2532                         *negp = 0;
2533                         lval = (unsigned long)val;
2534                 }
2535                 *lvalp = lval / HZ;
2536         }
2537         return 0;
2538 }
2539
2540 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2541                                                 int *valp,
2542                                                 int write, void *data)
2543 {
2544         if (write) {
2545                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2546                         return 1;
2547                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2548         } else {
2549                 int val = *valp;
2550                 unsigned long lval;
2551                 if (val < 0) {
2552                         *negp = -1;
2553                         lval = (unsigned long)-val;
2554                 } else {
2555                         *negp = 0;
2556                         lval = (unsigned long)val;
2557                 }
2558                 *lvalp = jiffies_to_clock_t(lval);
2559         }
2560         return 0;
2561 }
2562
2563 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2564                                             int *valp,
2565                                             int write, void *data)
2566 {
2567         if (write) {
2568                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2569         } else {
2570                 int val = *valp;
2571                 unsigned long lval;
2572                 if (val < 0) {
2573                         *negp = -1;
2574                         lval = (unsigned long)-val;
2575                 } else {
2576                         *negp = 0;
2577                         lval = (unsigned long)val;
2578                 }
2579                 *lvalp = jiffies_to_msecs(lval);
2580         }
2581         return 0;
2582 }
2583
2584 /**
2585  * proc_dointvec_jiffies - read a vector of integers as seconds
2586  * @table: the sysctl table
2587  * @write: %TRUE if this is a write to the sysctl file
2588  * @filp: the file structure
2589  * @buffer: the user buffer
2590  * @lenp: the size of the user buffer
2591  * @ppos: file position
2592  *
2593  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2594  * values from/to the user buffer, treated as an ASCII string.
2595  * The values read are assumed to be in seconds, and are converted into
2596  * jiffies.
2597  *
2598  * Returns 0 on success.
2599  */
2600 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2601                           void __user *buffer, size_t *lenp, loff_t *ppos)
2602 {
2603     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2604                             do_proc_dointvec_jiffies_conv,NULL);
2605 }
2606
2607 /**
2608  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2609  * @table: the sysctl table
2610  * @write: %TRUE if this is a write to the sysctl file
2611  * @filp: the file structure
2612  * @buffer: the user buffer
2613  * @lenp: the size of the user buffer
2614  * @ppos: pointer to the file position
2615  *
2616  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2617  * values from/to the user buffer, treated as an ASCII string.
2618  * The values read are assumed to be in 1/USER_HZ seconds, and
2619  * are converted into jiffies.
2620  *
2621  * Returns 0 on success.
2622  */
2623 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2624                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2625 {
2626     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2627                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2628 }
2629
2630 /**
2631  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2632  * @table: the sysctl table
2633  * @write: %TRUE if this is a write to the sysctl file
2634  * @filp: the file structure
2635  * @buffer: the user buffer
2636  * @lenp: the size of the user buffer
2637  * @ppos: file position
2638  * @ppos: the current position in the file
2639  *
2640  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2641  * values from/to the user buffer, treated as an ASCII string.
2642  * The values read are assumed to be in 1/1000 seconds, and
2643  * are converted into jiffies.
2644  *
2645  * Returns 0 on success.
2646  */
2647 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2648                              void __user *buffer, size_t *lenp, loff_t *ppos)
2649 {
2650         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2651                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2652 }
2653
2654 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2655                            void __user *buffer, size_t *lenp, loff_t *ppos)
2656 {
2657         struct pid *new_pid;
2658         pid_t tmp;
2659         int r;
2660
2661         tmp = pid_vnr(cad_pid);
2662
2663         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2664                                lenp, ppos, NULL, NULL);
2665         if (r || !write)
2666                 return r;
2667
2668         new_pid = find_get_pid(tmp);
2669         if (!new_pid)
2670                 return -ESRCH;
2671
2672         put_pid(xchg(&cad_pid, new_pid));
2673         return 0;
2674 }
2675
2676 #else /* CONFIG_PROC_FS */
2677
2678 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2679                   void __user *buffer, size_t *lenp, loff_t *ppos)
2680 {
2681         return -ENOSYS;
2682 }
2683
2684 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2685                   void __user *buffer, size_t *lenp, loff_t *ppos)
2686 {
2687         return -ENOSYS;
2688 }
2689
2690 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2691                     void __user *buffer, size_t *lenp, loff_t *ppos)
2692 {
2693         return -ENOSYS;
2694 }
2695
2696 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2697                     void __user *buffer, size_t *lenp, loff_t *ppos)
2698 {
2699         return -ENOSYS;
2700 }
2701
2702 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2703                     void __user *buffer, size_t *lenp, loff_t *ppos)
2704 {
2705         return -ENOSYS;
2706 }
2707
2708 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2709                              void __user *buffer, size_t *lenp, loff_t *ppos)
2710 {
2711         return -ENOSYS;
2712 }
2713
2714 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2715                     void __user *buffer, size_t *lenp, loff_t *ppos)
2716 {
2717         return -ENOSYS;
2718 }
2719
2720 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2721                                       struct file *filp,
2722                                       void __user *buffer,
2723                                       size_t *lenp, loff_t *ppos)
2724 {
2725     return -ENOSYS;
2726 }
2727
2728
2729 #endif /* CONFIG_PROC_FS */
2730
2731
2732 #ifdef CONFIG_SYSCTL_SYSCALL
2733 /*
2734  * General sysctl support routines
2735  */
2736
2737 /* The generic sysctl data routine (used if no strategy routine supplied) */
2738 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2739                 void __user *oldval, size_t __user *oldlenp,
2740                 void __user *newval, size_t newlen)
2741 {
2742         size_t len;
2743
2744         /* Get out of I don't have a variable */
2745         if (!table->data || !table->maxlen)
2746                 return -ENOTDIR;
2747
2748         if (oldval && oldlenp) {
2749                 if (get_user(len, oldlenp))
2750                         return -EFAULT;
2751                 if (len) {
2752                         if (len > table->maxlen)
2753                                 len = table->maxlen;
2754                         if (copy_to_user(oldval, table->data, len))
2755                                 return -EFAULT;
2756                         if (put_user(len, oldlenp))
2757                                 return -EFAULT;
2758                 }
2759         }
2760
2761         if (newval && newlen) {
2762                 if (newlen > table->maxlen)
2763                         newlen = table->maxlen;
2764
2765                 if (copy_from_user(table->data, newval, newlen))
2766                         return -EFAULT;
2767         }
2768         return 1;
2769 }
2770
2771 /* The generic string strategy routine: */
2772 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2773                   void __user *oldval, size_t __user *oldlenp,
2774                   void __user *newval, size_t newlen)
2775 {
2776         if (!table->data || !table->maxlen)
2777                 return -ENOTDIR;
2778
2779         if (oldval && oldlenp) {
2780                 size_t bufsize;
2781                 if (get_user(bufsize, oldlenp))
2782                         return -EFAULT;
2783                 if (bufsize) {
2784                         size_t len = strlen(table->data), copied;
2785
2786                         /* This shouldn't trigger for a well-formed sysctl */
2787                         if (len > table->maxlen)
2788                                 len = table->maxlen;
2789
2790                         /* Copy up to a max of bufsize-1 bytes of the string */
2791                         copied = (len >= bufsize) ? bufsize - 1 : len;
2792
2793                         if (copy_to_user(oldval, table->data, copied) ||
2794                             put_user(0, (char __user *)(oldval + copied)))
2795                                 return -EFAULT;
2796                         if (put_user(len, oldlenp))
2797                                 return -EFAULT;
2798                 }
2799         }
2800         if (newval && newlen) {
2801                 size_t len = newlen;
2802                 if (len > table->maxlen)
2803                         len = table->maxlen;
2804                 if(copy_from_user(table->data, newval, len))
2805                         return -EFAULT;
2806                 if (len == table->maxlen)
2807                         len--;
2808                 ((char *) table->data)[len] = 0;
2809         }
2810         return 1;
2811 }
2812
2813 /*
2814  * This function makes sure that all of the integers in the vector
2815  * are between the minimum and maximum values given in the arrays
2816  * table->extra1 and table->extra2, respectively.
2817  */
2818 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2819                 void __user *oldval, size_t __user *oldlenp,
2820                 void __user *newval, size_t newlen)
2821 {
2822
2823         if (newval && newlen) {
2824                 int __user *vec = (int __user *) newval;
2825                 int *min = (int *) table->extra1;
2826                 int *max = (int *) table->extra2;
2827                 size_t length;
2828                 int i;
2829
2830                 if (newlen % sizeof(int) != 0)
2831                         return -EINVAL;
2832
2833                 if (!table->extra1 && !table->extra2)
2834                         return 0;
2835
2836                 if (newlen > table->maxlen)
2837                         newlen = table->maxlen;
2838                 length = newlen / sizeof(int);
2839
2840                 for (i = 0; i < length; i++) {
2841                         int value;
2842                         if (get_user(value, vec + i))
2843                                 return -EFAULT;
2844                         if (min && value < min[i])
2845                                 return -EINVAL;
2846                         if (max && value > max[i])
2847                                 return -EINVAL;
2848                 }
2849         }
2850         return 0;
2851 }
2852
2853 /* Strategy function to convert jiffies to seconds */
2854 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2855                 void __user *oldval, size_t __user *oldlenp,
2856                 void __user *newval, size_t newlen)
2857 {
2858         if (oldval && oldlenp) {
2859                 size_t olen;
2860
2861                 if (get_user(olen, oldlenp))
2862                         return -EFAULT;
2863                 if (olen) {
2864                         int val;
2865
2866                         if (olen < sizeof(int))
2867                                 return -EINVAL;
2868
2869                         val = *(int *)(table->data) / HZ;
2870                         if (put_user(val, (int __user *)oldval))
2871                                 return -EFAULT;
2872                         if (put_user(sizeof(int), oldlenp))
2873                                 return -EFAULT;
2874                 }
2875         }
2876         if (newval && newlen) {
2877                 int new;
2878                 if (newlen != sizeof(int))
2879                         return -EINVAL;
2880                 if (get_user(new, (int __user *)newval))
2881                         return -EFAULT;
2882                 *(int *)(table->data) = new*HZ;
2883         }
2884         return 1;
2885 }
2886
2887 /* Strategy function to convert jiffies to seconds */
2888 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2889                 void __user *oldval, size_t __user *oldlenp,
2890                 void __user *newval, size_t newlen)
2891 {
2892         if (oldval && oldlenp) {
2893                 size_t olen;
2894
2895                 if (get_user(olen, oldlenp))
2896                         return -EFAULT;
2897                 if (olen) {
2898                         int val;
2899
2900                         if (olen < sizeof(int))
2901                                 return -EINVAL;
2902
2903                         val = jiffies_to_msecs(*(int *)(table->data));
2904                         if (put_user(val, (int __user *)oldval))
2905                                 return -EFAULT;
2906                         if (put_user(sizeof(int), oldlenp))
2907                                 return -EFAULT;
2908                 }
2909         }
2910         if (newval && newlen) {
2911                 int new;
2912                 if (newlen != sizeof(int))
2913                         return -EINVAL;
2914                 if (get_user(new, (int __user *)newval))
2915                         return -EFAULT;
2916                 *(int *)(table->data) = msecs_to_jiffies(new);
2917         }
2918         return 1;
2919 }
2920
2921
2922
2923 #else /* CONFIG_SYSCTL_SYSCALL */
2924
2925
2926 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
2927 {
2928         struct __sysctl_args tmp;
2929         int error;
2930
2931         if (copy_from_user(&tmp, args, sizeof(tmp)))
2932                 return -EFAULT;
2933
2934         error = deprecated_sysctl_warning(&tmp);
2935
2936         /* If no error reading the parameters then just -ENOSYS ... */
2937         if (!error)
2938                 error = -ENOSYS;
2939
2940         return error;
2941 }
2942
2943 int sysctl_data(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 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2951                   void __user *oldval, size_t __user *oldlenp,
2952                   void __user *newval, size_t newlen)
2953 {
2954         return -ENOSYS;
2955 }
2956
2957 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2958                 void __user *oldval, size_t __user *oldlenp,
2959                 void __user *newval, size_t newlen)
2960 {
2961         return -ENOSYS;
2962 }
2963
2964 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2965                 void __user *oldval, size_t __user *oldlenp,
2966                 void __user *newval, size_t newlen)
2967 {
2968         return -ENOSYS;
2969 }
2970
2971 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2972                 void __user *oldval, size_t __user *oldlenp,
2973                 void __user *newval, size_t newlen)
2974 {
2975         return -ENOSYS;
2976 }
2977
2978 #endif /* CONFIG_SYSCTL_SYSCALL */
2979
2980 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2981 {
2982         static int msg_count;
2983         int name[CTL_MAXNAME];
2984         int i;
2985
2986         /* Check args->nlen. */
2987         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2988                 return -ENOTDIR;
2989
2990         /* Read in the sysctl name for better debug message logging */
2991         for (i = 0; i < args->nlen; i++)
2992                 if (get_user(name[i], args->name + i))
2993                         return -EFAULT;
2994
2995         /* Ignore accesses to kernel.version */
2996         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2997                 return 0;
2998
2999         if (msg_count < 5) {
3000                 msg_count++;
3001                 printk(KERN_INFO
3002                         "warning: process `%s' used the deprecated sysctl "
3003                         "system call with ", current->comm);
3004                 for (i = 0; i < args->nlen; i++)
3005                         printk("%d.", name[i]);
3006                 printk("\n");
3007         }
3008         return 0;
3009 }
3010
3011 /*
3012  * No sense putting this after each symbol definition, twice,
3013  * exception granted :-)
3014  */
3015 EXPORT_SYMBOL(proc_dointvec);
3016 EXPORT_SYMBOL(proc_dointvec_jiffies);
3017 EXPORT_SYMBOL(proc_dointvec_minmax);
3018 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3019 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3020 EXPORT_SYMBOL(proc_dostring);
3021 EXPORT_SYMBOL(proc_doulongvec_minmax);
3022 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3023 EXPORT_SYMBOL(register_sysctl_table);
3024 EXPORT_SYMBOL(register_sysctl_paths);
3025 EXPORT_SYMBOL(sysctl_intvec);
3026 EXPORT_SYMBOL(sysctl_jiffies);
3027 EXPORT_SYMBOL(sysctl_ms_jiffies);
3028 EXPORT_SYMBOL(sysctl_string);
3029 EXPORT_SYMBOL(sysctl_data);
3030 EXPORT_SYMBOL(unregister_sysctl_table);