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

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/security.h>
  41 #include <linux/initrd.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49
  50 #include <asm/uaccess.h>
  51 #include <asm/processor.h>
  52
  53 #ifdef CONFIG_X86
  54 #include <asm/nmi.h>
  55 #include <asm/stacktrace.h>
  56 #include <asm/io.h>
  57 #endif
  58
  59 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  60
  61 #if defined(CONFIG_SYSCTL)
  62
  63 /* External variables not in a header file. */
  64 extern int C_A_D;
  65 extern int print_fatal_signals;
  66 extern int sysctl_overcommit_memory;
  67 extern int sysctl_overcommit_ratio;
  68 extern int sysctl_panic_on_oom;
  69 extern int sysctl_oom_kill_allocating_task;
  70 extern int max_threads;
  71 extern int core_uses_pid;
  72 extern int suid_dumpable;
  73 extern char core_pattern[];
  74 extern int pid_max;
  75 extern int min_free_kbytes;
  76 extern int printk_ratelimit_jiffies;
  77 extern int printk_ratelimit_burst;
  78 extern int pid_max_min, pid_max_max;
  79 extern int sysctl_drop_caches;
  80 extern int percpu_pagelist_fraction;
  81 extern int compat_log;
  82 extern int maps_protect;
  83 extern int sysctl_stat_interval;
  84 extern int latencytop_enabled;
  85
  86 /* Constants used for minimum and  maximum */
  87 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
  88 static int one = 1;
  89 #endif
  90
  91 #ifdef CONFIG_DETECT_SOFTLOCKUP
  92 static int sixty = 60;
  93 #endif
  94
  95 #ifdef CONFIG_MMU
  96 static int two = 2;
  97 #endif
  98
  99 static int zero;
 100 static int one_hundred = 100;
 101
 102 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 103 static int maxolduid = 65535;
 104 static int minolduid;
 105 static int min_percpu_pagelist_fract = 8;
 106
 107 static int ngroups_max = NGROUPS_MAX;
 108
 109 #ifdef CONFIG_KMOD
 110 extern char modprobe_path[];
 111 #endif
 112 #ifdef CONFIG_CHR_DEV_SG
 113 extern int sg_big_buff;
 114 #endif
 115
 116 #ifdef __sparc__
 117 extern char reboot_command [];
 118 extern int stop_a_enabled;
 119 extern int scons_pwroff;
 120 #endif
 121
 122 #ifdef __hppa__
 123 extern int pwrsw_enabled;
 124 extern int unaligned_enabled;
 125 #endif
 126
 127 #ifdef CONFIG_S390
 128 #ifdef CONFIG_MATHEMU
 129 extern int sysctl_ieee_emulation_warnings;
 130 #endif
 131 extern int sysctl_userprocess_debug;
 132 extern int spin_retry;
 133 #endif
 134
 135 extern int sysctl_hz_timer;
 136
 137 #ifdef CONFIG_BSD_PROCESS_ACCT
 138 extern int acct_parm[];
 139 #endif
 140
 141 #ifdef CONFIG_IA64
 142 extern int no_unaligned_warning;
 143 #endif
 144
 145 #ifdef CONFIG_RT_MUTEXES
 146 extern int max_lock_depth;
 147 #endif
 148
 149 #ifdef CONFIG_SYSCTL_SYSCALL
 150 static int parse_table(int __user *, int, void __user *, size_t __user *,
 151                 void __user *, size_t, struct ctl_table *);
 152 #endif
 153
 154
 155 #ifdef CONFIG_PROC_SYSCTL
 156 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 157                   void __user *buffer, size_t *lenp, loff_t *ppos);
 158 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 159                                void __user *buffer, size_t *lenp, loff_t *ppos);
 160 #endif
 161
 162 static struct ctl_table root_table[];
 163 static struct ctl_table_root sysctl_table_root;
 164 static struct ctl_table_header root_table_header = {
 165         .ctl_table = root_table,
 166         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 167         .root = &sysctl_table_root,
 168 };
 169 static struct ctl_table_root sysctl_table_root = {
 170         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 171         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 172 };
 173
 174 static struct ctl_table kern_table[];
 175 static struct ctl_table vm_table[];
 176 static struct ctl_table fs_table[];
 177 static struct ctl_table debug_table[];
 178 static struct ctl_table dev_table[];
 179 extern struct ctl_table random_table[];
 180 #ifdef CONFIG_INOTIFY_USER
 181 extern struct ctl_table inotify_table[];
 182 #endif
 183
 184 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 185 int sysctl_legacy_va_layout;
 186 #endif
 187
 188 extern int prove_locking;
 189 extern int lock_stat;
 190
 191 /* The default sysctl tables: */
 192
 193 static struct ctl_table root_table[] = {
 194         {
 195                 .ctl_name       = CTL_KERN,
 196                 .procname       = "kernel",
 197                 .mode           = 0555,
 198                 .child          = kern_table,
 199         },
 200         {
 201                 .ctl_name       = CTL_VM,
 202                 .procname       = "vm",
 203                 .mode           = 0555,
 204                 .child          = vm_table,
 205         },
 206         {
 207                 .ctl_name       = CTL_FS,
 208                 .procname       = "fs",
 209                 .mode           = 0555,
 210                 .child          = fs_table,
 211         },
 212         {
 213                 .ctl_name       = CTL_DEBUG,
 214                 .procname       = "debug",
 215                 .mode           = 0555,
 216                 .child          = debug_table,
 217         },
 218         {
 219                 .ctl_name       = CTL_DEV,
 220                 .procname       = "dev",
 221                 .mode           = 0555,
 222                 .child          = dev_table,
 223         },
 224 /*
 225  * NOTE: do not add new entries to this table unless you have read
 226  * Documentation/sysctl/ctl_unnumbered.txt
 227  */
 228         { .ctl_name = 0 }
 229 };
 230
 231 #ifdef CONFIG_SCHED_DEBUG
 232 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 233 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 234 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 235 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 236 #endif
 237
 238 static struct ctl_table kern_table[] = {
 239 #ifdef CONFIG_SCHED_DEBUG
 240         {
 241                 .ctl_name       = CTL_UNNUMBERED,
 242                 .procname       = "sched_min_granularity_ns",
 243                 .data           = &sysctl_sched_min_granularity,
 244                 .maxlen         = sizeof(unsigned int),
 245                 .mode           = 0644,
 246                 .proc_handler   = &sched_nr_latency_handler,
 247                 .strategy       = &sysctl_intvec,
 248                 .extra1         = &min_sched_granularity_ns,
 249                 .extra2         = &max_sched_granularity_ns,
 250         },
 251         {
 252                 .ctl_name       = CTL_UNNUMBERED,
 253                 .procname       = "sched_latency_ns",
 254                 .data           = &sysctl_sched_latency,
 255                 .maxlen         = sizeof(unsigned int),
 256                 .mode           = 0644,
 257                 .proc_handler   = &sched_nr_latency_handler,
 258                 .strategy       = &sysctl_intvec,
 259                 .extra1         = &min_sched_granularity_ns,
 260                 .extra2         = &max_sched_granularity_ns,
 261         },
 262         {
 263                 .ctl_name       = CTL_UNNUMBERED,
 264                 .procname       = "sched_wakeup_granularity_ns",
 265                 .data           = &sysctl_sched_wakeup_granularity,
 266                 .maxlen         = sizeof(unsigned int),
 267                 .mode           = 0644,
 268                 .proc_handler   = &proc_dointvec_minmax,
 269                 .strategy       = &sysctl_intvec,
 270                 .extra1         = &min_wakeup_granularity_ns,
 271                 .extra2         = &max_wakeup_granularity_ns,
 272         },
 273         {
 274                 .ctl_name       = CTL_UNNUMBERED,
 275                 .procname       = "sched_batch_wakeup_granularity_ns",
 276                 .data           = &sysctl_sched_batch_wakeup_granularity,
 277                 .maxlen         = sizeof(unsigned int),
 278                 .mode           = 0644,
 279                 .proc_handler   = &proc_dointvec_minmax,
 280                 .strategy       = &sysctl_intvec,
 281                 .extra1         = &min_wakeup_granularity_ns,
 282                 .extra2         = &max_wakeup_granularity_ns,
 283         },
 284         {
 285                 .ctl_name       = CTL_UNNUMBERED,
 286                 .procname       = "sched_child_runs_first",
 287                 .data           = &sysctl_sched_child_runs_first,
 288                 .maxlen         = sizeof(unsigned int),
 289                 .mode           = 0644,
 290                 .proc_handler   = &proc_dointvec,
 291         },
 292         {
 293                 .ctl_name       = CTL_UNNUMBERED,
 294                 .procname       = "sched_features",
 295                 .data           = &sysctl_sched_features,
 296                 .maxlen         = sizeof(unsigned int),
 297                 .mode           = 0644,
 298                 .proc_handler   = &proc_dointvec,
 299         },
 300         {
 301                 .ctl_name       = CTL_UNNUMBERED,
 302                 .procname       = "sched_migration_cost",
 303                 .data           = &sysctl_sched_migration_cost,
 304                 .maxlen         = sizeof(unsigned int),
 305                 .mode           = 0644,
 306                 .proc_handler   = &proc_dointvec,
 307         },
 308         {
 309                 .ctl_name       = CTL_UNNUMBERED,
 310                 .procname       = "sched_nr_migrate",
 311                 .data           = &sysctl_sched_nr_migrate,
 312                 .maxlen         = sizeof(unsigned int),
 313                 .mode           = 0644,
 314                 .proc_handler   = &proc_dointvec,
 315         },
 316         {
 317                 .ctl_name       = CTL_UNNUMBERED,
 318                 .procname       = "sched_rt_period_ms",
 319                 .data           = &sysctl_sched_rt_period,
 320                 .maxlen         = sizeof(unsigned int),
 321                 .mode           = 0644,
 322                 .proc_handler   = &proc_dointvec,
 323         },
 324         {
 325                 .ctl_name       = CTL_UNNUMBERED,
 326                 .procname       = "sched_rt_ratio",
 327                 .data           = &sysctl_sched_rt_ratio,
 328                 .maxlen         = sizeof(unsigned int),
 329                 .mode           = 0644,
 330                 .proc_handler   = &proc_dointvec,
 331         },
 332 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
 333         {
 334                 .ctl_name       = CTL_UNNUMBERED,
 335                 .procname       = "sched_min_bal_int_shares",
 336                 .data           = &sysctl_sched_min_bal_int_shares,
 337                 .maxlen         = sizeof(unsigned int),
 338                 .mode           = 0644,
 339                 .proc_handler   = &proc_dointvec,
 340         },
 341         {
 342                 .ctl_name       = CTL_UNNUMBERED,
 343                 .procname       = "sched_max_bal_int_shares",
 344                 .data           = &sysctl_sched_max_bal_int_shares,
 345                 .maxlen         = sizeof(unsigned int),
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_dointvec,
 348         },
 349 #endif
 350 #endif
 351         {
 352                 .ctl_name       = CTL_UNNUMBERED,
 353                 .procname       = "sched_compat_yield",
 354                 .data           = &sysctl_sched_compat_yield,
 355                 .maxlen         = sizeof(unsigned int),
 356                 .mode           = 0644,
 357                 .proc_handler   = &proc_dointvec,
 358         },
 359 #ifdef CONFIG_PROVE_LOCKING
 360         {
 361                 .ctl_name       = CTL_UNNUMBERED,
 362                 .procname       = "prove_locking",
 363                 .data           = &prove_locking,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = &proc_dointvec,
 367         },
 368 #endif
 369 #ifdef CONFIG_LOCK_STAT
 370         {
 371                 .ctl_name       = CTL_UNNUMBERED,
 372                 .procname       = "lock_stat",
 373                 .data           = &lock_stat,
 374                 .maxlen         = sizeof(int),
 375                 .mode           = 0644,
 376                 .proc_handler   = &proc_dointvec,
 377         },
 378 #endif
 379         {
 380                 .ctl_name       = KERN_PANIC,
 381                 .procname       = "panic",
 382                 .data           = &panic_timeout,
 383                 .maxlen         = sizeof(int),
 384                 .mode           = 0644,
 385                 .proc_handler   = &proc_dointvec,
 386         },
 387         {
 388                 .ctl_name       = KERN_CORE_USES_PID,
 389                 .procname       = "core_uses_pid",
 390                 .data           = &core_uses_pid,
 391                 .maxlen         = sizeof(int),
 392                 .mode           = 0644,
 393                 .proc_handler   = &proc_dointvec,
 394         },
 395         {
 396                 .ctl_name       = KERN_CORE_PATTERN,
 397                 .procname       = "core_pattern",
 398                 .data           = core_pattern,
 399                 .maxlen         = CORENAME_MAX_SIZE,
 400                 .mode           = 0644,
 401                 .proc_handler   = &proc_dostring,
 402                 .strategy       = &sysctl_string,
 403         },
 404 #ifdef CONFIG_PROC_SYSCTL
 405         {
 406                 .procname       = "tainted",
 407                 .data           = &tainted,
 408                 .maxlen         = sizeof(int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec_taint,
 411         },
 412 #endif
 413 #ifdef CONFIG_LATENCYTOP
 414         {
 415                 .procname       = "latencytop",
 416                 .data           = &latencytop_enabled,
 417                 .maxlen         = sizeof(int),
 418                 .mode           = 0644,
 419                 .proc_handler   = &proc_dointvec,
 420         },
 421 #endif
 422 #ifdef CONFIG_BLK_DEV_INITRD
 423         {
 424                 .ctl_name       = KERN_REALROOTDEV,
 425                 .procname       = "real-root-dev",
 426                 .data           = &real_root_dev,
 427                 .maxlen         = sizeof(int),
 428                 .mode           = 0644,
 429                 .proc_handler   = &proc_dointvec,
 430         },
 431 #endif
 432         {
 433                 .ctl_name       = CTL_UNNUMBERED,
 434                 .procname       = "print-fatal-signals",
 435                 .data           = &print_fatal_signals,
 436                 .maxlen         = sizeof(int),
 437                 .mode           = 0644,
 438                 .proc_handler   = &proc_dointvec,
 439         },
 440 #ifdef __sparc__
 441         {
 442                 .ctl_name       = KERN_SPARC_REBOOT,
 443                 .procname       = "reboot-cmd",
 444                 .data           = reboot_command,
 445                 .maxlen         = 256,
 446                 .mode           = 0644,
 447                 .proc_handler   = &proc_dostring,
 448                 .strategy       = &sysctl_string,
 449         },
 450         {
 451                 .ctl_name       = KERN_SPARC_STOP_A,
 452                 .procname       = "stop-a",
 453                 .data           = &stop_a_enabled,
 454                 .maxlen         = sizeof (int),
 455                 .mode           = 0644,
 456                 .proc_handler   = &proc_dointvec,
 457         },
 458         {
 459                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 460                 .procname       = "scons-poweroff",
 461                 .data           = &scons_pwroff,
 462                 .maxlen         = sizeof (int),
 463                 .mode           = 0644,
 464                 .proc_handler   = &proc_dointvec,
 465         },
 466 #endif
 467 #ifdef __hppa__
 468         {
 469                 .ctl_name       = KERN_HPPA_PWRSW,
 470                 .procname       = "soft-power",
 471                 .data           = &pwrsw_enabled,
 472                 .maxlen         = sizeof (int),
 473                 .mode           = 0644,
 474                 .proc_handler   = &proc_dointvec,
 475         },
 476         {
 477                 .ctl_name       = KERN_HPPA_UNALIGNED,
 478                 .procname       = "unaligned-trap",
 479                 .data           = &unaligned_enabled,
 480                 .maxlen         = sizeof (int),
 481                 .mode           = 0644,
 482                 .proc_handler   = &proc_dointvec,
 483         },
 484 #endif
 485         {
 486                 .ctl_name       = KERN_CTLALTDEL,
 487                 .procname       = "ctrl-alt-del",
 488                 .data           = &C_A_D,
 489                 .maxlen         = sizeof(int),
 490                 .mode           = 0644,
 491                 .proc_handler   = &proc_dointvec,
 492         },
 493         {
 494                 .ctl_name       = KERN_PRINTK,
 495                 .procname       = "printk",
 496                 .data           = &console_loglevel,
 497                 .maxlen         = 4*sizeof(int),
 498                 .mode           = 0644,
 499                 .proc_handler   = &proc_dointvec,
 500         },
 501 #ifdef CONFIG_KMOD
 502         {
 503                 .ctl_name       = KERN_MODPROBE,
 504                 .procname       = "modprobe",
 505                 .data           = &modprobe_path,
 506                 .maxlen         = KMOD_PATH_LEN,
 507                 .mode           = 0644,
 508                 .proc_handler   = &proc_dostring,
 509                 .strategy       = &sysctl_string,
 510         },
 511 #endif
 512 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 513         {
 514                 .ctl_name       = KERN_HOTPLUG,
 515                 .procname       = "hotplug",
 516                 .data           = &uevent_helper,
 517                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 518                 .mode           = 0644,
 519                 .proc_handler   = &proc_dostring,
 520                 .strategy       = &sysctl_string,
 521         },
 522 #endif
 523 #ifdef CONFIG_CHR_DEV_SG
 524         {
 525                 .ctl_name       = KERN_SG_BIG_BUFF,
 526                 .procname       = "sg-big-buff",
 527                 .data           = &sg_big_buff,
 528                 .maxlen         = sizeof (int),
 529                 .mode           = 0444,
 530                 .proc_handler   = &proc_dointvec,
 531         },
 532 #endif
 533 #ifdef CONFIG_BSD_PROCESS_ACCT
 534         {
 535                 .ctl_name       = KERN_ACCT,
 536                 .procname       = "acct",
 537                 .data           = &acct_parm,
 538                 .maxlen         = 3*sizeof(int),
 539                 .mode           = 0644,
 540                 .proc_handler   = &proc_dointvec,
 541         },
 542 #endif
 543 #ifdef CONFIG_MAGIC_SYSRQ
 544         {
 545                 .ctl_name       = KERN_SYSRQ,
 546                 .procname       = "sysrq",
 547                 .data           = &__sysrq_enabled,
 548                 .maxlen         = sizeof (int),
 549                 .mode           = 0644,
 550                 .proc_handler   = &proc_dointvec,
 551         },
 552 #endif
 553 #ifdef CONFIG_PROC_SYSCTL
 554         {
 555                 .procname       = "cad_pid",
 556                 .data           = NULL,
 557                 .maxlen         = sizeof (int),
 558                 .mode           = 0600,
 559                 .proc_handler   = &proc_do_cad_pid,
 560         },
 561 #endif
 562         {
 563                 .ctl_name       = KERN_MAX_THREADS,
 564                 .procname       = "threads-max",
 565                 .data           = &max_threads,
 566                 .maxlen         = sizeof(int),
 567                 .mode           = 0644,
 568                 .proc_handler   = &proc_dointvec,
 569         },
 570         {
 571                 .ctl_name       = KERN_RANDOM,
 572                 .procname       = "random",
 573                 .mode           = 0555,
 574                 .child          = random_table,
 575         },
 576         {
 577                 .ctl_name       = KERN_OVERFLOWUID,
 578                 .procname       = "overflowuid",
 579                 .data           = &overflowuid,
 580                 .maxlen         = sizeof(int),
 581                 .mode           = 0644,
 582                 .proc_handler   = &proc_dointvec_minmax,
 583                 .strategy       = &sysctl_intvec,
 584                 .extra1         = &minolduid,
 585                 .extra2         = &maxolduid,
 586         },
 587         {
 588                 .ctl_name       = KERN_OVERFLOWGID,
 589                 .procname       = "overflowgid",
 590                 .data           = &overflowgid,
 591                 .maxlen         = sizeof(int),
 592                 .mode           = 0644,
 593                 .proc_handler   = &proc_dointvec_minmax,
 594                 .strategy       = &sysctl_intvec,
 595                 .extra1         = &minolduid,
 596                 .extra2         = &maxolduid,
 597         },
 598 #ifdef CONFIG_S390
 599 #ifdef CONFIG_MATHEMU
 600         {
 601                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 602                 .procname       = "ieee_emulation_warnings",
 603                 .data           = &sysctl_ieee_emulation_warnings,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec,
 607         },
 608 #endif
 609 #ifdef CONFIG_NO_IDLE_HZ
 610         {
 611                 .ctl_name       = KERN_HZ_TIMER,
 612                 .procname       = "hz_timer",
 613                 .data           = &sysctl_hz_timer,
 614                 .maxlen         = sizeof(int),
 615                 .mode           = 0644,
 616                 .proc_handler   = &proc_dointvec,
 617         },
 618 #endif
 619         {
 620                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 621                 .procname       = "userprocess_debug",
 622                 .data           = &sysctl_userprocess_debug,
 623                 .maxlen         = sizeof(int),
 624                 .mode           = 0644,
 625                 .proc_handler   = &proc_dointvec,
 626         },
 627 #endif
 628         {
 629                 .ctl_name       = KERN_PIDMAX,
 630                 .procname       = "pid_max",
 631                 .data           = &pid_max,
 632                 .maxlen         = sizeof (int),
 633                 .mode           = 0644,
 634                 .proc_handler   = &proc_dointvec_minmax,
 635                 .strategy       = sysctl_intvec,
 636                 .extra1         = &pid_max_min,
 637                 .extra2         = &pid_max_max,
 638         },
 639         {
 640                 .ctl_name       = KERN_PANIC_ON_OOPS,
 641                 .procname       = "panic_on_oops",
 642                 .data           = &panic_on_oops,
 643                 .maxlen         = sizeof(int),
 644                 .mode           = 0644,
 645                 .proc_handler   = &proc_dointvec,
 646         },
 647         {
 648                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 649                 .procname       = "printk_ratelimit",
 650                 .data           = &printk_ratelimit_jiffies,
 651                 .maxlen         = sizeof(int),
 652                 .mode           = 0644,
 653                 .proc_handler   = &proc_dointvec_jiffies,
 654                 .strategy       = &sysctl_jiffies,
 655         },
 656         {
 657                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 658                 .procname       = "printk_ratelimit_burst",
 659                 .data           = &printk_ratelimit_burst,
 660                 .maxlen         = sizeof(int),
 661                 .mode           = 0644,
 662                 .proc_handler   = &proc_dointvec,
 663         },
 664         {
 665                 .ctl_name       = KERN_NGROUPS_MAX,
 666                 .procname       = "ngroups_max",
 667                 .data           = &ngroups_max,
 668                 .maxlen         = sizeof (int),
 669                 .mode           = 0444,
 670                 .proc_handler   = &proc_dointvec,
 671         },
 672 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 673         {
 674                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 675                 .procname       = "unknown_nmi_panic",
 676                 .data           = &unknown_nmi_panic,
 677                 .maxlen         = sizeof (int),
 678                 .mode           = 0644,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681         {
 682                 .procname       = "nmi_watchdog",
 683                 .data           = &nmi_watchdog_enabled,
 684                 .maxlen         = sizeof (int),
 685                 .mode           = 0644,
 686                 .proc_handler   = &proc_nmi_enabled,
 687         },
 688 #endif
 689 #if defined(CONFIG_X86)
 690         {
 691                 .ctl_name       = KERN_PANIC_ON_NMI,
 692                 .procname       = "panic_on_unrecovered_nmi",
 693                 .data           = &panic_on_unrecovered_nmi,
 694                 .maxlen         = sizeof(int),
 695                 .mode           = 0644,
 696                 .proc_handler   = &proc_dointvec,
 697         },
 698         {
 699                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 700                 .procname       = "bootloader_type",
 701                 .data           = &bootloader_type,
 702                 .maxlen         = sizeof (int),
 703                 .mode           = 0444,
 704                 .proc_handler   = &proc_dointvec,
 705         },
 706         {
 707                 .ctl_name       = CTL_UNNUMBERED,
 708                 .procname       = "kstack_depth_to_print",
 709                 .data           = &kstack_depth_to_print,
 710                 .maxlen         = sizeof(int),
 711                 .mode           = 0644,
 712                 .proc_handler   = &proc_dointvec,
 713         },
 714         {
 715                 .ctl_name       = CTL_UNNUMBERED,
 716                 .procname       = "io_delay_type",
 717                 .data           = &io_delay_type,
 718                 .maxlen         = sizeof(int),
 719                 .mode           = 0644,
 720                 .proc_handler   = &proc_dointvec,
 721         },
 722 #endif
 723 #if defined(CONFIG_MMU)
 724         {
 725                 .ctl_name       = KERN_RANDOMIZE,
 726                 .procname       = "randomize_va_space",
 727                 .data           = &randomize_va_space,
 728                 .maxlen         = sizeof(int),
 729                 .mode           = 0644,
 730                 .proc_handler   = &proc_dointvec,
 731         },
 732 #endif
 733 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 734         {
 735                 .ctl_name       = KERN_SPIN_RETRY,
 736                 .procname       = "spin_retry",
 737                 .data           = &spin_retry,
 738                 .maxlen         = sizeof (int),
 739                 .mode           = 0644,
 740                 .proc_handler   = &proc_dointvec,
 741         },
 742 #endif
 743 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 744         {
 745                 .procname       = "acpi_video_flags",
 746                 .data           = &acpi_realmode_flags,
 747                 .maxlen         = sizeof (unsigned long),
 748                 .mode           = 0644,
 749                 .proc_handler   = &proc_doulongvec_minmax,
 750         },
 751 #endif
 752 #ifdef CONFIG_IA64
 753         {
 754                 .ctl_name       = KERN_IA64_UNALIGNED,
 755                 .procname       = "ignore-unaligned-usertrap",
 756                 .data           = &no_unaligned_warning,
 757                 .maxlen         = sizeof (int),
 758                 .mode           = 0644,
 759                 .proc_handler   = &proc_dointvec,
 760         },
 761 #endif
 762 #ifdef CONFIG_DETECT_SOFTLOCKUP
 763         {
 764                 .ctl_name       = CTL_UNNUMBERED,
 765                 .procname       = "softlockup_thresh",
 766                 .data           = &softlockup_thresh,
 767                 .maxlen         = sizeof(unsigned long),
 768                 .mode           = 0644,
 769                 .proc_handler   = &proc_doulongvec_minmax,
 770                 .strategy       = &sysctl_intvec,
 771                 .extra1         = &one,
 772                 .extra2         = &sixty,
 773         },
 774         {
 775                 .ctl_name       = CTL_UNNUMBERED,
 776                 .procname       = "hung_task_check_count",
 777                 .data           = &sysctl_hung_task_check_count,
 778                 .maxlen         = sizeof(unsigned long),
 779                 .mode           = 0644,
 780                 .proc_handler   = &proc_doulongvec_minmax,
 781                 .strategy       = &sysctl_intvec,
 782         },
 783         {
 784                 .ctl_name       = CTL_UNNUMBERED,
 785                 .procname       = "hung_task_timeout_secs",
 786                 .data           = &sysctl_hung_task_timeout_secs,
 787                 .maxlen         = sizeof(unsigned long),
 788                 .mode           = 0644,
 789                 .proc_handler   = &proc_doulongvec_minmax,
 790                 .strategy       = &sysctl_intvec,
 791         },
 792         {
 793                 .ctl_name       = CTL_UNNUMBERED,
 794                 .procname       = "hung_task_warnings",
 795                 .data           = &sysctl_hung_task_warnings,
 796                 .maxlen         = sizeof(unsigned long),
 797                 .mode           = 0644,
 798                 .proc_handler   = &proc_doulongvec_minmax,
 799                 .strategy       = &sysctl_intvec,
 800         },
 801 #endif
 802 #ifdef CONFIG_COMPAT
 803         {
 804                 .ctl_name       = KERN_COMPAT_LOG,
 805                 .procname       = "compat-log",
 806                 .data           = &compat_log,
 807                 .maxlen         = sizeof (int),
 808                 .mode           = 0644,
 809                 .proc_handler   = &proc_dointvec,
 810         },
 811 #endif
 812 #ifdef CONFIG_RT_MUTEXES
 813         {
 814                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 815                 .procname       = "max_lock_depth",
 816                 .data           = &max_lock_depth,
 817                 .maxlen         = sizeof(int),
 818                 .mode           = 0644,
 819                 .proc_handler   = &proc_dointvec,
 820         },
 821 #endif
 822 #ifdef CONFIG_PROC_FS
 823         {
 824                 .ctl_name       = CTL_UNNUMBERED,
 825                 .procname       = "maps_protect",
 826                 .data           = &maps_protect,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = &proc_dointvec,
 830         },
 831 #endif
 832         {
 833                 .ctl_name       = CTL_UNNUMBERED,
 834                 .procname       = "poweroff_cmd",
 835                 .data           = &poweroff_cmd,
 836                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 837                 .mode           = 0644,
 838                 .proc_handler   = &proc_dostring,
 839                 .strategy       = &sysctl_string,
 840         },
 841 /*
 842  * NOTE: do not add new entries to this table unless you have read
 843  * Documentation/sysctl/ctl_unnumbered.txt
 844  */
 845         { .ctl_name = 0 }
 846 };
 847
 848 static struct ctl_table vm_table[] = {
 849         {
 850                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 851                 .procname       = "overcommit_memory",
 852                 .data           = &sysctl_overcommit_memory,
 853                 .maxlen         = sizeof(sysctl_overcommit_memory),
 854                 .mode           = 0644,
 855                 .proc_handler   = &proc_dointvec,
 856         },
 857         {
 858                 .ctl_name       = VM_PANIC_ON_OOM,
 859                 .procname       = "panic_on_oom",
 860                 .data           = &sysctl_panic_on_oom,
 861                 .maxlen         = sizeof(sysctl_panic_on_oom),
 862                 .mode           = 0644,
 863                 .proc_handler   = &proc_dointvec,
 864         },
 865         {
 866                 .ctl_name       = CTL_UNNUMBERED,
 867                 .procname       = "oom_kill_allocating_task",
 868                 .data           = &sysctl_oom_kill_allocating_task,
 869                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 870                 .mode           = 0644,
 871                 .proc_handler   = &proc_dointvec,
 872         },
 873         {
 874                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 875                 .procname       = "overcommit_ratio",
 876                 .data           = &sysctl_overcommit_ratio,
 877                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 878                 .mode           = 0644,
 879                 .proc_handler   = &proc_dointvec,
 880         },
 881         {
 882                 .ctl_name       = VM_PAGE_CLUSTER,
 883                 .procname       = "page-cluster",
 884                 .data           = &page_cluster,
 885                 .maxlen         = sizeof(int),
 886                 .mode           = 0644,
 887                 .proc_handler   = &proc_dointvec,
 888         },
 889         {
 890                 .ctl_name       = VM_DIRTY_BACKGROUND,
 891                 .procname       = "dirty_background_ratio",
 892                 .data           = &dirty_background_ratio,
 893                 .maxlen         = sizeof(dirty_background_ratio),
 894                 .mode           = 0644,
 895                 .proc_handler   = &proc_dointvec_minmax,
 896                 .strategy       = &sysctl_intvec,
 897                 .extra1         = &zero,
 898                 .extra2         = &one_hundred,
 899         },
 900         {
 901                 .ctl_name       = VM_DIRTY_RATIO,
 902                 .procname       = "dirty_ratio",
 903                 .data           = &vm_dirty_ratio,
 904                 .maxlen         = sizeof(vm_dirty_ratio),
 905                 .mode           = 0644,
 906                 .proc_handler   = &dirty_ratio_handler,
 907                 .strategy       = &sysctl_intvec,
 908                 .extra1         = &zero,
 909                 .extra2         = &one_hundred,
 910         },
 911         {
 912                 .procname       = "dirty_writeback_centisecs",
 913                 .data           = &dirty_writeback_interval,
 914                 .maxlen         = sizeof(dirty_writeback_interval),
 915                 .mode           = 0644,
 916                 .proc_handler   = &dirty_writeback_centisecs_handler,
 917         },
 918         {
 919                 .procname       = "dirty_expire_centisecs",
 920                 .data           = &dirty_expire_interval,
 921                 .maxlen         = sizeof(dirty_expire_interval),
 922                 .mode           = 0644,
 923                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 924         },
 925         {
 926                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 927                 .procname       = "nr_pdflush_threads",
 928                 .data           = &nr_pdflush_threads,
 929                 .maxlen         = sizeof nr_pdflush_threads,
 930                 .mode           = 0444 /* read-only*/,
 931                 .proc_handler   = &proc_dointvec,
 932         },
 933         {
 934                 .ctl_name       = VM_SWAPPINESS,
 935                 .procname       = "swappiness",
 936                 .data           = &vm_swappiness,
 937                 .maxlen         = sizeof(vm_swappiness),
 938                 .mode           = 0644,
 939                 .proc_handler   = &proc_dointvec_minmax,
 940                 .strategy       = &sysctl_intvec,
 941                 .extra1         = &zero,
 942                 .extra2         = &one_hundred,
 943         },
 944 #ifdef CONFIG_HUGETLB_PAGE
 945          {
 946                 .procname       = "nr_hugepages",
 947                 .data           = &max_huge_pages,
 948                 .maxlen         = sizeof(unsigned long),
 949                 .mode           = 0644,
 950                 .proc_handler   = &hugetlb_sysctl_handler,
 951                 .extra1         = (void *)&hugetlb_zero,
 952                 .extra2         = (void *)&hugetlb_infinity,
 953          },
 954          {
 955                 .ctl_name       = VM_HUGETLB_GROUP,
 956                 .procname       = "hugetlb_shm_group",
 957                 .data           = &sysctl_hugetlb_shm_group,
 958                 .maxlen         = sizeof(gid_t),
 959                 .mode           = 0644,
 960                 .proc_handler   = &proc_dointvec,
 961          },
 962          {
 963                 .ctl_name       = CTL_UNNUMBERED,
 964                 .procname       = "hugepages_treat_as_movable",
 965                 .data           = &hugepages_treat_as_movable,
 966                 .maxlen         = sizeof(int),
 967                 .mode           = 0644,
 968                 .proc_handler   = &hugetlb_treat_movable_handler,
 969         },
 970         {
 971                 .ctl_name       = CTL_UNNUMBERED,
 972                 .procname       = "nr_overcommit_hugepages",
 973                 .data           = &nr_overcommit_huge_pages,
 974                 .maxlen         = sizeof(nr_overcommit_huge_pages),
 975                 .mode           = 0644,
 976                 .proc_handler   = &proc_doulongvec_minmax,
 977         },
 978 #endif
 979         {
 980                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 981                 .procname       = "lowmem_reserve_ratio",
 982                 .data           = &sysctl_lowmem_reserve_ratio,
 983                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 984                 .mode           = 0644,
 985                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 986                 .strategy       = &sysctl_intvec,
 987         },
 988         {
 989                 .ctl_name       = VM_DROP_PAGECACHE,
 990                 .procname       = "drop_caches",
 991                 .data           = &sysctl_drop_caches,
 992                 .maxlen         = sizeof(int),
 993                 .mode           = 0644,
 994                 .proc_handler   = drop_caches_sysctl_handler,
 995                 .strategy       = &sysctl_intvec,
 996         },
 997         {
 998                 .ctl_name       = VM_MIN_FREE_KBYTES,
 999                 .procname       = "min_free_kbytes",
1000                 .data           = &min_free_kbytes,
1001                 .maxlen         = sizeof(min_free_kbytes),
1002                 .mode           = 0644,
1003                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1004                 .strategy       = &sysctl_intvec,
1005                 .extra1         = &zero,
1006         },
1007         {
1008                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1009                 .procname       = "percpu_pagelist_fraction",
1010                 .data           = &percpu_pagelist_fraction,
1011                 .maxlen         = sizeof(percpu_pagelist_fraction),
1012                 .mode           = 0644,
1013                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1014                 .strategy       = &sysctl_intvec,
1015                 .extra1         = &min_percpu_pagelist_fract,
1016         },
1017 #ifdef CONFIG_MMU
1018         {
1019                 .ctl_name       = VM_MAX_MAP_COUNT,
1020                 .procname       = "max_map_count",
1021                 .data           = &sysctl_max_map_count,
1022                 .maxlen         = sizeof(sysctl_max_map_count),
1023                 .mode           = 0644,
1024                 .proc_handler   = &proc_dointvec
1025         },
1026 #endif
1027         {
1028                 .ctl_name       = VM_LAPTOP_MODE,
1029                 .procname       = "laptop_mode",
1030                 .data           = &laptop_mode,
1031                 .maxlen         = sizeof(laptop_mode),
1032                 .mode           = 0644,
1033                 .proc_handler   = &proc_dointvec_jiffies,
1034                 .strategy       = &sysctl_jiffies,
1035         },
1036         {
1037                 .ctl_name       = VM_BLOCK_DUMP,
1038                 .procname       = "block_dump",
1039                 .data           = &block_dump,
1040                 .maxlen         = sizeof(block_dump),
1041                 .mode           = 0644,
1042                 .proc_handler   = &proc_dointvec,
1043                 .strategy       = &sysctl_intvec,
1044                 .extra1         = &zero,
1045         },
1046         {
1047                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1048                 .procname       = "vfs_cache_pressure",
1049                 .data           = &sysctl_vfs_cache_pressure,
1050                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1051                 .mode           = 0644,
1052                 .proc_handler   = &proc_dointvec,
1053                 .strategy       = &sysctl_intvec,
1054                 .extra1         = &zero,
1055         },
1056 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1057         {
1058                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1059                 .procname       = "legacy_va_layout",
1060                 .data           = &sysctl_legacy_va_layout,
1061                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1062                 .mode           = 0644,
1063                 .proc_handler   = &proc_dointvec,
1064                 .strategy       = &sysctl_intvec,
1065                 .extra1         = &zero,
1066         },
1067 #endif
1068 #ifdef CONFIG_NUMA
1069         {
1070                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1071                 .procname       = "zone_reclaim_mode",
1072                 .data           = &zone_reclaim_mode,
1073                 .maxlen         = sizeof(zone_reclaim_mode),
1074                 .mode           = 0644,
1075                 .proc_handler   = &proc_dointvec,
1076                 .strategy       = &sysctl_intvec,
1077                 .extra1         = &zero,
1078         },
1079         {
1080                 .ctl_name       = VM_MIN_UNMAPPED,
1081                 .procname       = "min_unmapped_ratio",
1082                 .data           = &sysctl_min_unmapped_ratio,
1083                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1084                 .mode           = 0644,
1085                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1086                 .strategy       = &sysctl_intvec,
1087                 .extra1         = &zero,
1088                 .extra2         = &one_hundred,
1089         },
1090         {
1091                 .ctl_name       = VM_MIN_SLAB,
1092                 .procname       = "min_slab_ratio",
1093                 .data           = &sysctl_min_slab_ratio,
1094                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1095                 .mode           = 0644,
1096                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1097                 .strategy       = &sysctl_intvec,
1098                 .extra1         = &zero,
1099                 .extra2         = &one_hundred,
1100         },
1101 #endif
1102 #ifdef CONFIG_SMP
1103         {
1104                 .ctl_name       = CTL_UNNUMBERED,
1105                 .procname       = "stat_interval",
1106                 .data           = &sysctl_stat_interval,
1107                 .maxlen         = sizeof(sysctl_stat_interval),
1108                 .mode           = 0644,
1109                 .proc_handler   = &proc_dointvec_jiffies,
1110                 .strategy       = &sysctl_jiffies,
1111         },
1112 #endif
1113 #ifdef CONFIG_SECURITY
1114         {
1115                 .ctl_name       = CTL_UNNUMBERED,
1116                 .procname       = "mmap_min_addr",
1117                 .data           = &mmap_min_addr,
1118                 .maxlen         = sizeof(unsigned long),
1119                 .mode           = 0644,
1120                 .proc_handler   = &proc_doulongvec_minmax,
1121         },
1122 #endif
1123 #ifdef CONFIG_NUMA
1124         {
1125                 .ctl_name       = CTL_UNNUMBERED,
1126                 .procname       = "numa_zonelist_order",
1127                 .data           = &numa_zonelist_order,
1128                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1129                 .mode           = 0644,
1130                 .proc_handler   = &numa_zonelist_order_handler,
1131                 .strategy       = &sysctl_string,
1132         },
1133 #endif
1134 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1135    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1136         {
1137                 .ctl_name       = VM_VDSO_ENABLED,
1138                 .procname       = "vdso_enabled",
1139                 .data           = &vdso_enabled,
1140                 .maxlen         = sizeof(vdso_enabled),
1141                 .mode           = 0644,
1142                 .proc_handler   = &proc_dointvec,
1143                 .strategy       = &sysctl_intvec,
1144                 .extra1         = &zero,
1145         },
1146 #endif
1147 #ifdef CONFIG_HIGHMEM
1148         {
1149                 .ctl_name       = CTL_UNNUMBERED,
1150                 .procname       = "highmem_is_dirtyable",
1151                 .data           = &vm_highmem_is_dirtyable,
1152                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1153                 .mode           = 0644,
1154                 .proc_handler   = &proc_dointvec_minmax,
1155                 .strategy       = &sysctl_intvec,
1156                 .extra1         = &zero,
1157                 .extra2         = &one,
1158         },
1159 #endif
1160 /*
1161  * NOTE: do not add new entries to this table unless you have read
1162  * Documentation/sysctl/ctl_unnumbered.txt
1163  */
1164         { .ctl_name = 0 }
1165 };
1166
1167 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1168 static struct ctl_table binfmt_misc_table[] = {
1169         { .ctl_name = 0 }
1170 };
1171 #endif
1172
1173 static struct ctl_table fs_table[] = {
1174         {
1175                 .ctl_name       = FS_NRINODE,
1176                 .procname       = "inode-nr",
1177                 .data           = &inodes_stat,
1178                 .maxlen         = 2*sizeof(int),
1179                 .mode           = 0444,
1180                 .proc_handler   = &proc_dointvec,
1181         },
1182         {
1183                 .ctl_name       = FS_STATINODE,
1184                 .procname       = "inode-state",
1185                 .data           = &inodes_stat,
1186                 .maxlen         = 7*sizeof(int),
1187                 .mode           = 0444,
1188                 .proc_handler   = &proc_dointvec,
1189         },
1190         {
1191                 .procname       = "file-nr",
1192                 .data           = &files_stat,
1193                 .maxlen         = 3*sizeof(int),
1194                 .mode           = 0444,
1195                 .proc_handler   = &proc_nr_files,
1196         },
1197         {
1198                 .ctl_name       = FS_MAXFILE,
1199                 .procname       = "file-max",
1200                 .data           = &files_stat.max_files,
1201                 .maxlen         = sizeof(int),
1202                 .mode           = 0644,
1203                 .proc_handler   = &proc_dointvec,
1204         },
1205         {
1206                 .ctl_name       = CTL_UNNUMBERED,
1207                 .procname       = "nr_open",
1208                 .data           = &sysctl_nr_open,
1209                 .maxlen         = sizeof(int),
1210                 .mode           = 0644,
1211                 .proc_handler   = &proc_dointvec,
1212         },
1213         {
1214                 .ctl_name       = FS_DENTRY,
1215                 .procname       = "dentry-state",
1216                 .data           = &dentry_stat,
1217                 .maxlen         = 6*sizeof(int),
1218                 .mode           = 0444,
1219                 .proc_handler   = &proc_dointvec,
1220         },
1221         {
1222                 .ctl_name       = FS_OVERFLOWUID,
1223                 .procname       = "overflowuid",
1224                 .data           = &fs_overflowuid,
1225                 .maxlen         = sizeof(int),
1226                 .mode           = 0644,
1227                 .proc_handler   = &proc_dointvec_minmax,
1228                 .strategy       = &sysctl_intvec,
1229                 .extra1         = &minolduid,
1230                 .extra2         = &maxolduid,
1231         },
1232         {
1233                 .ctl_name       = FS_OVERFLOWGID,
1234                 .procname       = "overflowgid",
1235                 .data           = &fs_overflowgid,
1236                 .maxlen         = sizeof(int),
1237                 .mode           = 0644,
1238                 .proc_handler   = &proc_dointvec_minmax,
1239                 .strategy       = &sysctl_intvec,
1240                 .extra1         = &minolduid,
1241                 .extra2         = &maxolduid,
1242         },
1243         {
1244                 .ctl_name       = FS_LEASES,
1245                 .procname       = "leases-enable",
1246                 .data           = &leases_enable,
1247                 .maxlen         = sizeof(int),
1248                 .mode           = 0644,
1249                 .proc_handler   = &proc_dointvec,
1250         },
1251 #ifdef CONFIG_DNOTIFY
1252         {
1253                 .ctl_name       = FS_DIR_NOTIFY,
1254                 .procname       = "dir-notify-enable",
1255                 .data           = &dir_notify_enable,
1256                 .maxlen         = sizeof(int),
1257                 .mode           = 0644,
1258                 .proc_handler   = &proc_dointvec,
1259         },
1260 #endif
1261 #ifdef CONFIG_MMU
1262         {
1263                 .ctl_name       = FS_LEASE_TIME,
1264                 .procname       = "lease-break-time",
1265                 .data           = &lease_break_time,
1266                 .maxlen         = sizeof(int),
1267                 .mode           = 0644,
1268                 .proc_handler   = &proc_dointvec_minmax,
1269                 .strategy       = &sysctl_intvec,
1270                 .extra1         = &zero,
1271                 .extra2         = &two,
1272         },
1273         {
1274                 .procname       = "aio-nr",
1275                 .data           = &aio_nr,
1276                 .maxlen         = sizeof(aio_nr),
1277                 .mode           = 0444,
1278                 .proc_handler   = &proc_doulongvec_minmax,
1279         },
1280         {
1281                 .procname       = "aio-max-nr",
1282                 .data           = &aio_max_nr,
1283                 .maxlen         = sizeof(aio_max_nr),
1284                 .mode           = 0644,
1285                 .proc_handler   = &proc_doulongvec_minmax,
1286         },
1287 #ifdef CONFIG_INOTIFY_USER
1288         {
1289                 .ctl_name       = FS_INOTIFY,
1290                 .procname       = "inotify",
1291                 .mode           = 0555,
1292                 .child          = inotify_table,
1293         },
1294 #endif
1295 #endif
1296         {
1297                 .ctl_name       = KERN_SETUID_DUMPABLE,
1298                 .procname       = "suid_dumpable",
1299                 .data           = &suid_dumpable,
1300                 .maxlen         = sizeof(int),
1301                 .mode           = 0644,
1302                 .proc_handler   = &proc_dointvec,
1303         },
1304 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1305         {
1306                 .ctl_name       = CTL_UNNUMBERED,
1307                 .procname       = "binfmt_misc",
1308                 .mode           = 0555,
1309                 .child          = binfmt_misc_table,
1310         },
1311 #endif
1312 /*
1313  * NOTE: do not add new entries to this table unless you have read
1314  * Documentation/sysctl/ctl_unnumbered.txt
1315  */
1316         { .ctl_name = 0 }
1317 };
1318
1319 static struct ctl_table debug_table[] = {
1320 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1321         {
1322                 .ctl_name       = CTL_UNNUMBERED,
1323                 .procname       = "exception-trace",
1324                 .data           = &show_unhandled_signals,
1325                 .maxlen         = sizeof(int),
1326                 .mode           = 0644,
1327                 .proc_handler   = proc_dointvec
1328         },
1329 #endif
1330         { .ctl_name = 0 }
1331 };
1332
1333 static struct ctl_table dev_table[] = {
1334         { .ctl_name = 0 }
1335 };
1336
1337 static DEFINE_SPINLOCK(sysctl_lock);
1338
1339 /* called under sysctl_lock */
1340 static int use_table(struct ctl_table_header *p)
1341 {
1342         if (unlikely(p->unregistering))
1343                 return 0;
1344         p->used++;
1345         return 1;
1346 }
1347
1348 /* called under sysctl_lock */
1349 static void unuse_table(struct ctl_table_header *p)
1350 {
1351         if (!--p->used)
1352                 if (unlikely(p->unregistering))
1353                         complete(p->unregistering);
1354 }
1355
1356 /* called under sysctl_lock, will reacquire if has to wait */
1357 static void start_unregistering(struct ctl_table_header *p)
1358 {
1359         /*
1360          * if p->used is 0, nobody will ever touch that entry again;
1361          * we'll eliminate all paths to it before dropping sysctl_lock
1362          */
1363         if (unlikely(p->used)) {
1364                 struct completion wait;
1365                 init_completion(&wait);
1366                 p->unregistering = &wait;
1367                 spin_unlock(&sysctl_lock);
1368                 wait_for_completion(&wait);
1369                 spin_lock(&sysctl_lock);
1370         }
1371         /*
1372          * do not remove from the list until nobody holds it; walking the
1373          * list in do_sysctl() relies on that.
1374          */
1375         list_del_init(&p->ctl_entry);
1376 }
1377
1378 void sysctl_head_finish(struct ctl_table_header *head)
1379 {
1380         if (!head)
1381                 return;
1382         spin_lock(&sysctl_lock);
1383         unuse_table(head);
1384         spin_unlock(&sysctl_lock);
1385 }
1386
1387 static struct list_head *
1388 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1389 {
1390         struct list_head *header_list;
1391         header_list = &root->header_list;
1392         if (root->lookup)
1393                 header_list = root->lookup(root, namespaces);
1394         return header_list;
1395 }
1396
1397 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1398                                             struct ctl_table_header *prev)
1399 {
1400         struct ctl_table_root *root;
1401         struct list_head *header_list;
1402         struct ctl_table_header *head;
1403         struct list_head *tmp;
1404
1405         spin_lock(&sysctl_lock);
1406         if (prev) {
1407                 head = prev;
1408                 tmp = &prev->ctl_entry;
1409                 unuse_table(prev);
1410                 goto next;
1411         }
1412         tmp = &root_table_header.ctl_entry;
1413         for (;;) {
1414                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1415
1416                 if (!use_table(head))
1417                         goto next;
1418                 spin_unlock(&sysctl_lock);
1419                 return head;
1420         next:
1421                 root = head->root;
1422                 tmp = tmp->next;
1423                 header_list = lookup_header_list(root, namespaces);
1424                 if (tmp != header_list)
1425                         continue;
1426
1427                 do {
1428                         root = list_entry(root->root_list.next,
1429                                         struct ctl_table_root, root_list);
1430                         if (root == &sysctl_table_root)
1431                                 goto out;
1432                         header_list = lookup_header_list(root, namespaces);
1433                 } while (list_empty(header_list));
1434                 tmp = header_list->next;
1435         }
1436 out:
1437         spin_unlock(&sysctl_lock);
1438         return NULL;
1439 }
1440
1441 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1442 {
1443         return __sysctl_head_next(current->nsproxy, prev);
1444 }
1445
1446 void register_sysctl_root(struct ctl_table_root *root)
1447 {
1448         spin_lock(&sysctl_lock);
1449         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1450         spin_unlock(&sysctl_lock);
1451 }
1452
1453 #ifdef CONFIG_SYSCTL_SYSCALL
1454 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1455                void __user *newval, size_t newlen)
1456 {
1457         struct ctl_table_header *head;
1458         int error = -ENOTDIR;
1459
1460         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1461                 return -ENOTDIR;
1462         if (oldval) {
1463                 int old_len;
1464                 if (!oldlenp || get_user(old_len, oldlenp))
1465                         return -EFAULT;
1466         }
1467
1468         for (head = sysctl_head_next(NULL); head;
1469                         head = sysctl_head_next(head)) {
1470                 error = parse_table(name, nlen, oldval, oldlenp,
1471                                         newval, newlen, head->ctl_table);
1472                 if (error != -ENOTDIR) {
1473                         sysctl_head_finish(head);
1474                         break;
1475                 }
1476         }
1477         return error;
1478 }
1479
1480 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1481 {
1482         struct __sysctl_args tmp;
1483         int error;
1484
1485         if (copy_from_user(&tmp, args, sizeof(tmp)))
1486                 return -EFAULT;
1487
1488         error = deprecated_sysctl_warning(&tmp);
1489         if (error)
1490                 goto out;
1491
1492         lock_kernel();
1493         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1494                           tmp.newval, tmp.newlen);
1495         unlock_kernel();
1496 out:
1497         return error;
1498 }
1499 #endif /* CONFIG_SYSCTL_SYSCALL */
1500
1501 /*
1502  * sysctl_perm does NOT grant the superuser all rights automatically, because
1503  * some sysctl variables are readonly even to root.
1504  */
1505
1506 static int test_perm(int mode, int op)
1507 {
1508         if (!current->euid)
1509                 mode >>= 6;
1510         else if (in_egroup_p(0))
1511                 mode >>= 3;
1512         if ((mode & op & 0007) == op)
1513                 return 0;
1514         return -EACCES;
1515 }
1516
1517 int sysctl_perm(struct ctl_table *table, int op)
1518 {
1519         int error;
1520         error = security_sysctl(table, op);
1521         if (error)
1522                 return error;
1523         return test_perm(table->mode, op);
1524 }
1525
1526 #ifdef CONFIG_SYSCTL_SYSCALL
1527 static int parse_table(int __user *name, int nlen,
1528                        void __user *oldval, size_t __user *oldlenp,
1529                        void __user *newval, size_t newlen,
1530                        struct ctl_table *table)
1531 {
1532         int n;
1533 repeat:
1534         if (!nlen)
1535                 return -ENOTDIR;
1536         if (get_user(n, name))
1537                 return -EFAULT;
1538         for ( ; table->ctl_name || table->procname; table++) {
1539                 if (!table->ctl_name)
1540                         continue;
1541                 if (n == table->ctl_name) {
1542                         int error;
1543                         if (table->child) {
1544                                 if (sysctl_perm(table, 001))
1545                                         return -EPERM;
1546                                 name++;
1547                                 nlen--;
1548                                 table = table->child;
1549                                 goto repeat;
1550                         }
1551                         error = do_sysctl_strategy(table, name, nlen,
1552                                                    oldval, oldlenp,
1553                                                    newval, newlen);
1554                         return error;
1555                 }
1556         }
1557         return -ENOTDIR;
1558 }
1559
1560 /* Perform the actual read/write of a sysctl table entry. */
1561 int do_sysctl_strategy (struct ctl_table *table,
1562                         int __user *name, int nlen,
1563                         void __user *oldval, size_t __user *oldlenp,
1564                         void __user *newval, size_t newlen)
1565 {
1566         int op = 0, rc;
1567
1568         if (oldval)
1569                 op |= 004;
1570         if (newval)
1571                 op |= 002;
1572         if (sysctl_perm(table, op))
1573                 return -EPERM;
1574
1575         if (table->strategy) {
1576                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1577                                      newval, newlen);
1578                 if (rc < 0)
1579                         return rc;
1580                 if (rc > 0)
1581                         return 0;
1582         }
1583
1584         /* If there is no strategy routine, or if the strategy returns
1585          * zero, proceed with automatic r/w */
1586         if (table->data && table->maxlen) {
1587                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1588                                  newval, newlen);
1589                 if (rc < 0)
1590                         return rc;
1591         }
1592         return 0;
1593 }
1594 #endif /* CONFIG_SYSCTL_SYSCALL */
1595
1596 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1597 {
1598         for (; table->ctl_name || table->procname; table++) {
1599                 table->parent = parent;
1600                 if (table->child)
1601                         sysctl_set_parent(table, table->child);
1602         }
1603 }
1604
1605 static __init int sysctl_init(void)
1606 {
1607         int err;
1608         sysctl_set_parent(NULL, root_table);
1609         err = sysctl_check_table(current->nsproxy, root_table);
1610         return 0;
1611 }
1612
1613 core_initcall(sysctl_init);
1614
1615 /**
1616  * __register_sysctl_paths - register a sysctl hierarchy
1617  * @root: List of sysctl headers to register on
1618  * @namespaces: Data to compute which lists of sysctl entries are visible
1619  * @path: The path to the directory the sysctl table is in.
1620  * @table: the top-level table structure
1621  *
1622  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1623  * array. A completely 0 filled entry terminates the table.
1624  *
1625  * The members of the &struct ctl_table structure are used as follows:
1626  *
1627  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1628  *            must be unique within that level of sysctl
1629  *
1630  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1631  *            enter a sysctl file
1632  *
1633  * data - a pointer to data for use by proc_handler
1634  *
1635  * maxlen - the maximum size in bytes of the data
1636  *
1637  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1638  *
1639  * child - a pointer to the child sysctl table if this entry is a directory, or
1640  *         %NULL.
1641  *
1642  * proc_handler - the text handler routine (described below)
1643  *
1644  * strategy - the strategy routine (described below)
1645  *
1646  * de - for internal use by the sysctl routines
1647  *
1648  * extra1, extra2 - extra pointers usable by the proc handler routines
1649  *
1650  * Leaf nodes in the sysctl tree will be represented by a single file
1651  * under /proc; non-leaf nodes will be represented by directories.
1652  *
1653  * sysctl(2) can automatically manage read and write requests through
1654  * the sysctl table.  The data and maxlen fields of the ctl_table
1655  * struct enable minimal validation of the values being written to be
1656  * performed, and the mode field allows minimal authentication.
1657  *
1658  * More sophisticated management can be enabled by the provision of a
1659  * strategy routine with the table entry.  This will be called before
1660  * any automatic read or write of the data is performed.
1661  *
1662  * The strategy routine may return
1663  *
1664  * < 0 - Error occurred (error is passed to user process)
1665  *
1666  * 0   - OK - proceed with automatic read or write.
1667  *
1668  * > 0 - OK - read or write has been done by the strategy routine, so
1669  *       return immediately.
1670  *
1671  * There must be a proc_handler routine for any terminal nodes
1672  * mirrored under /proc/sys (non-terminals are handled by a built-in
1673  * directory handler).  Several default handlers are available to
1674  * cover common cases -
1675  *
1676  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1677  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1678  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1679  *
1680  * It is the handler's job to read the input buffer from user memory
1681  * and process it. The handler should return 0 on success.
1682  *
1683  * This routine returns %NULL on a failure to register, and a pointer
1684  * to the table header on success.
1685  */
1686 struct ctl_table_header *__register_sysctl_paths(
1687         struct ctl_table_root *root,
1688         struct nsproxy *namespaces,
1689         const struct ctl_path *path, struct ctl_table *table)
1690 {
1691         struct list_head *header_list;
1692         struct ctl_table_header *header;
1693         struct ctl_table *new, **prevp;
1694         unsigned int n, npath;
1695
1696         /* Count the path components */
1697         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1698                 ;
1699
1700         /*
1701          * For each path component, allocate a 2-element ctl_table array.
1702          * The first array element will be filled with the sysctl entry
1703          * for this, the second will be the sentinel (ctl_name == 0).
1704          *
1705          * We allocate everything in one go so that we don't have to
1706          * worry about freeing additional memory in unregister_sysctl_table.
1707          */
1708         header = kzalloc(sizeof(struct ctl_table_header) +
1709                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1710         if (!header)
1711                 return NULL;
1712
1713         new = (struct ctl_table *) (header + 1);
1714
1715         /* Now connect the dots */
1716         prevp = &header->ctl_table;
1717         for (n = 0; n < npath; ++n, ++path) {
1718                 /* Copy the procname */
1719                 new->procname = path->procname;
1720                 new->ctl_name = path->ctl_name;
1721                 new->mode     = 0555;
1722
1723                 *prevp = new;
1724                 prevp = &new->child;
1725
1726                 new += 2;
1727         }
1728         *prevp = table;
1729         header->ctl_table_arg = table;
1730
1731         INIT_LIST_HEAD(&header->ctl_entry);
1732         header->used = 0;
1733         header->unregistering = NULL;
1734         header->root = root;
1735         sysctl_set_parent(NULL, header->ctl_table);
1736         if (sysctl_check_table(namespaces, header->ctl_table)) {
1737                 kfree(header);
1738                 return NULL;
1739         }
1740         spin_lock(&sysctl_lock);
1741         header_list = lookup_header_list(root, namespaces);
1742         list_add_tail(&header->ctl_entry, header_list);
1743         spin_unlock(&sysctl_lock);
1744
1745         return header;
1746 }
1747
1748 /**
1749  * register_sysctl_table_path - register a sysctl table hierarchy
1750  * @path: The path to the directory the sysctl table is in.
1751  * @table: the top-level table structure
1752  *
1753  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1754  * array. A completely 0 filled entry terminates the table.
1755  *
1756  * See __register_sysctl_paths for more details.
1757  */
1758 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1759                                                 struct ctl_table *table)
1760 {
1761         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1762                                         path, table);
1763 }
1764
1765 /**
1766  * register_sysctl_table - register a sysctl table hierarchy
1767  * @table: the top-level table structure
1768  *
1769  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1770  * array. A completely 0 filled entry terminates the table.
1771  *
1772  * See register_sysctl_paths for more details.
1773  */
1774 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1775 {
1776         static const struct ctl_path null_path[] = { {} };
1777
1778         return register_sysctl_paths(null_path, table);
1779 }
1780
1781 /**
1782  * unregister_sysctl_table - unregister a sysctl table hierarchy
1783  * @header: the header returned from register_sysctl_table
1784  *
1785  * Unregisters the sysctl table and all children. proc entries may not
1786  * actually be removed until they are no longer used by anyone.
1787  */
1788 void unregister_sysctl_table(struct ctl_table_header * header)
1789 {
1790         might_sleep();
1791
1792         if (header == NULL)
1793                 return;
1794
1795         spin_lock(&sysctl_lock);
1796         start_unregistering(header);
1797         spin_unlock(&sysctl_lock);
1798         kfree(header);
1799 }
1800
1801 #else /* !CONFIG_SYSCTL */
1802 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1803 {
1804         return NULL;
1805 }
1806
1807 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1808                                                     struct ctl_table *table)
1809 {
1810         return NULL;
1811 }
1812
1813 void unregister_sysctl_table(struct ctl_table_header * table)
1814 {
1815 }
1816
1817 #endif /* CONFIG_SYSCTL */
1818
1819 /*
1820  * /proc/sys support
1821  */
1822
1823 #ifdef CONFIG_PROC_SYSCTL
1824
1825 static int _proc_do_string(void* data, int maxlen, int write,
1826                            struct file *filp, void __user *buffer,
1827                            size_t *lenp, loff_t *ppos)
1828 {
1829         size_t len;
1830         char __user *p;
1831         char c;
1832
1833         if (!data || !maxlen || !*lenp) {
1834                 *lenp = 0;
1835                 return 0;
1836         }
1837
1838         if (write) {
1839                 len = 0;
1840                 p = buffer;
1841                 while (len < *lenp) {
1842                         if (get_user(c, p++))
1843                                 return -EFAULT;
1844                         if (c == 0 || c == '\n')
1845                                 break;
1846                         len++;
1847                 }
1848                 if (len >= maxlen)
1849                         len = maxlen-1;
1850                 if(copy_from_user(data, buffer, len))
1851                         return -EFAULT;
1852                 ((char *) data)[len] = 0;
1853                 *ppos += *lenp;
1854         } else {
1855                 len = strlen(data);
1856                 if (len > maxlen)
1857                         len = maxlen;
1858
1859                 if (*ppos > len) {
1860                         *lenp = 0;
1861                         return 0;
1862                 }
1863
1864                 data += *ppos;
1865                 len  -= *ppos;
1866
1867                 if (len > *lenp)
1868                         len = *lenp;
1869                 if (len)
1870                         if(copy_to_user(buffer, data, len))
1871                                 return -EFAULT;
1872                 if (len < *lenp) {
1873                         if(put_user('\n', ((char __user *) buffer) + len))
1874                                 return -EFAULT;
1875                         len++;
1876                 }
1877                 *lenp = len;
1878                 *ppos += len;
1879         }
1880         return 0;
1881 }
1882
1883 /**
1884  * proc_dostring - read a string sysctl
1885  * @table: the sysctl table
1886  * @write: %TRUE if this is a write to the sysctl file
1887  * @filp: the file structure
1888  * @buffer: the user buffer
1889  * @lenp: the size of the user buffer
1890  * @ppos: file position
1891  *
1892  * Reads/writes a string from/to the user buffer. If the kernel
1893  * buffer provided is not large enough to hold the string, the
1894  * string is truncated. The copied string is %NULL-terminated.
1895  * If the string is being read by the user process, it is copied
1896  * and a newline '\n' is added. It is truncated if the buffer is
1897  * not large enough.
1898  *
1899  * Returns 0 on success.
1900  */
1901 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1902                   void __user *buffer, size_t *lenp, loff_t *ppos)
1903 {
1904         return _proc_do_string(table->data, table->maxlen, write, filp,
1905                                buffer, lenp, ppos);
1906 }
1907
1908
1909 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1910                                  int *valp,
1911                                  int write, void *data)
1912 {
1913         if (write) {
1914                 *valp = *negp ? -*lvalp : *lvalp;
1915         } else {
1916                 int val = *valp;
1917                 if (val < 0) {
1918                         *negp = -1;
1919                         *lvalp = (unsigned long)-val;
1920                 } else {
1921                         *negp = 0;
1922                         *lvalp = (unsigned long)val;
1923                 }
1924         }
1925         return 0;
1926 }
1927
1928 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1929                   int write, struct file *filp, void __user *buffer,
1930                   size_t *lenp, loff_t *ppos,
1931                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1932                               int write, void *data),
1933                   void *data)
1934 {
1935 #define TMPBUFLEN 21
1936         int *i, vleft, first=1, neg, val;
1937         unsigned long lval;
1938         size_t left, len;
1939
1940         char buf[TMPBUFLEN], *p;
1941         char __user *s = buffer;
1942
1943         if (!tbl_data || !table->maxlen || !*lenp ||
1944             (*ppos && !write)) {
1945                 *lenp = 0;
1946                 return 0;
1947         }
1948
1949         i = (int *) tbl_data;
1950         vleft = table->maxlen / sizeof(*i);
1951         left = *lenp;
1952
1953         if (!conv)
1954                 conv = do_proc_dointvec_conv;
1955
1956         for (; left && vleft--; i++, first=0) {
1957                 if (write) {
1958                         while (left) {
1959                                 char c;
1960                                 if (get_user(c, s))
1961                                         return -EFAULT;
1962                                 if (!isspace(c))
1963                                         break;
1964                                 left--;
1965                                 s++;
1966                         }
1967                         if (!left)
1968                                 break;
1969                         neg = 0;
1970                         len = left;
1971                         if (len > sizeof(buf) - 1)
1972                                 len = sizeof(buf) - 1;
1973                         if (copy_from_user(buf, s, len))
1974                                 return -EFAULT;
1975                         buf[len] = 0;
1976                         p = buf;
1977                         if (*p == '-' && left > 1) {
1978                                 neg = 1;
1979                                 p++;
1980                         }
1981                         if (*p < '0' || *p > '9')
1982                                 break;
1983
1984                         lval = simple_strtoul(p, &p, 0);
1985
1986                         len = p-buf;
1987                         if ((len < left) && *p && !isspace(*p))
1988                                 break;
1989                         if (neg)
1990                                 val = -val;
1991                         s += len;
1992                         left -= len;
1993
1994                         if (conv(&neg, &lval, i, 1, data))
1995                                 break;
1996                 } else {
1997                         p = buf;
1998                         if (!first)
1999                                 *p++ = '\t';
2000
2001                         if (conv(&neg, &lval, i, 0, data))
2002                                 break;
2003
2004                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2005                         len = strlen(buf);
2006                         if (len > left)
2007                                 len = left;
2008                         if(copy_to_user(s, buf, len))
2009                                 return -EFAULT;
2010                         left -= len;
2011                         s += len;
2012                 }
2013         }
2014
2015         if (!write && !first && left) {
2016                 if(put_user('\n', s))
2017                         return -EFAULT;
2018                 left--, s++;
2019         }
2020         if (write) {
2021                 while (left) {
2022                         char c;
2023                         if (get_user(c, s++))
2024                                 return -EFAULT;
2025                         if (!isspace(c))
2026                                 break;
2027                         left--;
2028                 }
2029         }
2030         if (write && first)
2031                 return -EINVAL;
2032         *lenp -= left;
2033         *ppos += *lenp;
2034         return 0;
2035 #undef TMPBUFLEN
2036 }
2037
2038 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2039                   void __user *buffer, size_t *lenp, loff_t *ppos,
2040                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2041                               int write, void *data),
2042                   void *data)
2043 {
2044         return __do_proc_dointvec(table->data, table, write, filp,
2045                         buffer, lenp, ppos, conv, data);
2046 }
2047
2048 /**
2049  * proc_dointvec - read a vector of integers
2050  * @table: the sysctl table
2051  * @write: %TRUE if this is a write to the sysctl file
2052  * @filp: the file structure
2053  * @buffer: the user buffer
2054  * @lenp: the size of the user buffer
2055  * @ppos: file position
2056  *
2057  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2058  * values from/to the user buffer, treated as an ASCII string.
2059  *
2060  * Returns 0 on success.
2061  */
2062 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2063                      void __user *buffer, size_t *lenp, loff_t *ppos)
2064 {
2065     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2066                             NULL,NULL);
2067 }
2068
2069 #define OP_SET  0
2070 #define OP_AND  1
2071 #define OP_OR   2
2072
2073 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2074                                       int *valp,
2075                                       int write, void *data)
2076 {
2077         int op = *(int *)data;
2078         if (write) {
2079                 int val = *negp ? -*lvalp : *lvalp;
2080                 switch(op) {
2081                 case OP_SET:    *valp = val; break;
2082                 case OP_AND:    *valp &= val; break;
2083                 case OP_OR:     *valp |= val; break;
2084                 }
2085         } else {
2086                 int val = *valp;
2087                 if (val < 0) {
2088                         *negp = -1;
2089                         *lvalp = (unsigned long)-val;
2090                 } else {
2091                         *negp = 0;
2092                         *lvalp = (unsigned long)val;
2093                 }
2094         }
2095         return 0;
2096 }
2097
2098 /*
2099  *      Taint values can only be increased
2100  */
2101 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2102                                void __user *buffer, size_t *lenp, loff_t *ppos)
2103 {
2104         int op;
2105
2106         if (write && !capable(CAP_SYS_ADMIN))
2107                 return -EPERM;
2108
2109         op = OP_OR;
2110         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2111                                 do_proc_dointvec_bset_conv,&op);
2112 }
2113
2114 struct do_proc_dointvec_minmax_conv_param {
2115         int *min;
2116         int *max;
2117 };
2118
2119 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2120                                         int *valp,
2121                                         int write, void *data)
2122 {
2123         struct do_proc_dointvec_minmax_conv_param *param = data;
2124         if (write) {
2125                 int val = *negp ? -*lvalp : *lvalp;
2126                 if ((param->min && *param->min > val) ||
2127                     (param->max && *param->max < val))
2128                         return -EINVAL;
2129                 *valp = val;
2130         } else {
2131                 int val = *valp;
2132                 if (val < 0) {
2133                         *negp = -1;
2134                         *lvalp = (unsigned long)-val;
2135                 } else {
2136                         *negp = 0;
2137                         *lvalp = (unsigned long)val;
2138                 }
2139         }
2140         return 0;
2141 }
2142
2143 /**
2144  * proc_dointvec_minmax - read a vector of integers with min/max values
2145  * @table: the sysctl table
2146  * @write: %TRUE if this is a write to the sysctl file
2147  * @filp: the file structure
2148  * @buffer: the user buffer
2149  * @lenp: the size of the user buffer
2150  * @ppos: file position
2151  *
2152  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2153  * values from/to the user buffer, treated as an ASCII string.
2154  *
2155  * This routine will ensure the values are within the range specified by
2156  * table->extra1 (min) and table->extra2 (max).
2157  *
2158  * Returns 0 on success.
2159  */
2160 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2161                   void __user *buffer, size_t *lenp, loff_t *ppos)
2162 {
2163         struct do_proc_dointvec_minmax_conv_param param = {
2164                 .min = (int *) table->extra1,
2165                 .max = (int *) table->extra2,
2166         };
2167         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2168                                 do_proc_dointvec_minmax_conv, &param);
2169 }
2170
2171 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2172                                      struct file *filp,
2173                                      void __user *buffer,
2174                                      size_t *lenp, loff_t *ppos,
2175                                      unsigned long convmul,
2176                                      unsigned long convdiv)
2177 {
2178 #define TMPBUFLEN 21
2179         unsigned long *i, *min, *max, val;
2180         int vleft, first=1, neg;
2181         size_t len, left;
2182         char buf[TMPBUFLEN], *p;
2183         char __user *s = buffer;
2184
2185         if (!data || !table->maxlen || !*lenp ||
2186             (*ppos && !write)) {
2187                 *lenp = 0;
2188                 return 0;
2189         }
2190
2191         i = (unsigned long *) data;
2192         min = (unsigned long *) table->extra1;
2193         max = (unsigned long *) table->extra2;
2194         vleft = table->maxlen / sizeof(unsigned long);
2195         left = *lenp;
2196
2197         for (; left && vleft--; i++, min++, max++, first=0) {
2198                 if (write) {
2199                         while (left) {
2200                                 char c;
2201                                 if (get_user(c, s))
2202                                         return -EFAULT;
2203                                 if (!isspace(c))
2204                                         break;
2205                                 left--;
2206                                 s++;
2207                         }
2208                         if (!left)
2209                                 break;
2210                         neg = 0;
2211                         len = left;
2212                         if (len > TMPBUFLEN-1)
2213                                 len = TMPBUFLEN-1;
2214                         if (copy_from_user(buf, s, len))
2215                                 return -EFAULT;
2216                         buf[len] = 0;
2217                         p = buf;
2218                         if (*p == '-' && left > 1) {
2219                                 neg = 1;
2220                                 p++;
2221                         }
2222                         if (*p < '0' || *p > '9')
2223                                 break;
2224                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2225                         len = p-buf;
2226                         if ((len < left) && *p && !isspace(*p))
2227                                 break;
2228                         if (neg)
2229                                 val = -val;
2230                         s += len;
2231                         left -= len;
2232
2233                         if(neg)
2234                                 continue;
2235                         if ((min && val < *min) || (max && val > *max))
2236                                 continue;
2237                         *i = val;
2238                 } else {
2239                         p = buf;
2240                         if (!first)
2241                                 *p++ = '\t';
2242                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2243                         len = strlen(buf);
2244                         if (len > left)
2245                                 len = left;
2246                         if(copy_to_user(s, buf, len))
2247                                 return -EFAULT;
2248                         left -= len;
2249                         s += len;
2250                 }
2251         }
2252
2253         if (!write && !first && left) {
2254                 if(put_user('\n', s))
2255                         return -EFAULT;
2256                 left--, s++;
2257         }
2258         if (write) {
2259                 while (left) {
2260                         char c;
2261                         if (get_user(c, s++))
2262                                 return -EFAULT;
2263                         if (!isspace(c))
2264                                 break;
2265                         left--;
2266                 }
2267         }
2268         if (write && first)
2269                 return -EINVAL;
2270         *lenp -= left;
2271         *ppos += *lenp;
2272         return 0;
2273 #undef TMPBUFLEN
2274 }
2275
2276 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2277                                      struct file *filp,
2278                                      void __user *buffer,
2279                                      size_t *lenp, loff_t *ppos,
2280                                      unsigned long convmul,
2281                                      unsigned long convdiv)
2282 {
2283         return __do_proc_doulongvec_minmax(table->data, table, write,
2284                         filp, buffer, lenp, ppos, convmul, convdiv);
2285 }
2286
2287 /**
2288  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2289  * @table: the sysctl table
2290  * @write: %TRUE if this is a write to the sysctl file
2291  * @filp: the file structure
2292  * @buffer: the user buffer
2293  * @lenp: the size of the user buffer
2294  * @ppos: file position
2295  *
2296  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2297  * values from/to the user buffer, treated as an ASCII string.
2298  *
2299  * This routine will ensure the values are within the range specified by
2300  * table->extra1 (min) and table->extra2 (max).
2301  *
2302  * Returns 0 on success.
2303  */
2304 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2305                            void __user *buffer, size_t *lenp, loff_t *ppos)
2306 {
2307     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2308 }
2309
2310 /**
2311  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2312  * @table: the sysctl table
2313  * @write: %TRUE if this is a write to the sysctl file
2314  * @filp: the file structure
2315  * @buffer: the user buffer
2316  * @lenp: the size of the user buffer
2317  * @ppos: file position
2318  *
2319  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2320  * values from/to the user buffer, treated as an ASCII string. The values
2321  * are treated as milliseconds, and converted to jiffies when they are stored.
2322  *
2323  * This routine will ensure the values are within the range specified by
2324  * table->extra1 (min) and table->extra2 (max).
2325  *
2326  * Returns 0 on success.
2327  */
2328 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2329                                       struct file *filp,
2330                                       void __user *buffer,
2331                                       size_t *lenp, loff_t *ppos)
2332 {
2333     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2334                                      lenp, ppos, HZ, 1000l);
2335 }
2336
2337
2338 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2339                                          int *valp,
2340                                          int write, void *data)
2341 {
2342         if (write) {
2343                 if (*lvalp > LONG_MAX / HZ)
2344                         return 1;
2345                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2346         } else {
2347                 int val = *valp;
2348                 unsigned long lval;
2349                 if (val < 0) {
2350                         *negp = -1;
2351                         lval = (unsigned long)-val;
2352                 } else {
2353                         *negp = 0;
2354                         lval = (unsigned long)val;
2355                 }
2356                 *lvalp = lval / HZ;
2357         }
2358         return 0;
2359 }
2360
2361 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2362                                                 int *valp,
2363                                                 int write, void *data)
2364 {
2365         if (write) {
2366                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2367                         return 1;
2368                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2369         } else {
2370                 int val = *valp;
2371                 unsigned long lval;
2372                 if (val < 0) {
2373                         *negp = -1;
2374                         lval = (unsigned long)-val;
2375                 } else {
2376                         *negp = 0;
2377                         lval = (unsigned long)val;
2378                 }
2379                 *lvalp = jiffies_to_clock_t(lval);
2380         }
2381         return 0;
2382 }
2383
2384 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2385                                             int *valp,
2386                                             int write, void *data)
2387 {
2388         if (write) {
2389                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2390         } else {
2391                 int val = *valp;
2392                 unsigned long lval;
2393                 if (val < 0) {
2394                         *negp = -1;
2395                         lval = (unsigned long)-val;
2396                 } else {
2397                         *negp = 0;
2398                         lval = (unsigned long)val;
2399                 }
2400                 *lvalp = jiffies_to_msecs(lval);
2401         }
2402         return 0;
2403 }
2404
2405 /**
2406  * proc_dointvec_jiffies - read a vector of integers as seconds
2407  * @table: the sysctl table
2408  * @write: %TRUE if this is a write to the sysctl file
2409  * @filp: the file structure
2410  * @buffer: the user buffer
2411  * @lenp: the size of the user buffer
2412  * @ppos: file position
2413  *
2414  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2415  * values from/to the user buffer, treated as an ASCII string.
2416  * The values read are assumed to be in seconds, and are converted into
2417  * jiffies.
2418  *
2419  * Returns 0 on success.
2420  */
2421 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2422                           void __user *buffer, size_t *lenp, loff_t *ppos)
2423 {
2424     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2425                             do_proc_dointvec_jiffies_conv,NULL);
2426 }
2427
2428 /**
2429  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2430  * @table: the sysctl table
2431  * @write: %TRUE if this is a write to the sysctl file
2432  * @filp: the file structure
2433  * @buffer: the user buffer
2434  * @lenp: the size of the user buffer
2435  * @ppos: pointer to the file position
2436  *
2437  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2438  * values from/to the user buffer, treated as an ASCII string.
2439  * The values read are assumed to be in 1/USER_HZ seconds, and
2440  * are converted into jiffies.
2441  *
2442  * Returns 0 on success.
2443  */
2444 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2445                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2446 {
2447     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2448                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2449 }
2450
2451 /**
2452  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2453  * @table: the sysctl table
2454  * @write: %TRUE if this is a write to the sysctl file
2455  * @filp: the file structure
2456  * @buffer: the user buffer
2457  * @lenp: the size of the user buffer
2458  * @ppos: file position
2459  * @ppos: the current position in the file
2460  *
2461  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2462  * values from/to the user buffer, treated as an ASCII string.
2463  * The values read are assumed to be in 1/1000 seconds, and
2464  * are converted into jiffies.
2465  *
2466  * Returns 0 on success.
2467  */
2468 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2469                              void __user *buffer, size_t *lenp, loff_t *ppos)
2470 {
2471         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2472                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2473 }
2474
2475 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2476                            void __user *buffer, size_t *lenp, loff_t *ppos)
2477 {
2478         struct pid *new_pid;
2479         pid_t tmp;
2480         int r;
2481
2482         tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
2483
2484         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2485                                lenp, ppos, NULL, NULL);
2486         if (r || !write)
2487                 return r;
2488
2489         new_pid = find_get_pid(tmp);
2490         if (!new_pid)
2491                 return -ESRCH;
2492
2493         put_pid(xchg(&cad_pid, new_pid));
2494         return 0;
2495 }
2496
2497 #else /* CONFIG_PROC_FS */
2498
2499 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2500                   void __user *buffer, size_t *lenp, loff_t *ppos)
2501 {
2502         return -ENOSYS;
2503 }
2504
2505 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2506                   void __user *buffer, size_t *lenp, loff_t *ppos)
2507 {
2508         return -ENOSYS;
2509 }
2510
2511 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2512                     void __user *buffer, size_t *lenp, loff_t *ppos)
2513 {
2514         return -ENOSYS;
2515 }
2516
2517 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2518                     void __user *buffer, size_t *lenp, loff_t *ppos)
2519 {
2520         return -ENOSYS;
2521 }
2522
2523 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2524                     void __user *buffer, size_t *lenp, loff_t *ppos)
2525 {
2526         return -ENOSYS;
2527 }
2528
2529 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2530                              void __user *buffer, size_t *lenp, loff_t *ppos)
2531 {
2532         return -ENOSYS;
2533 }
2534
2535 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2536                     void __user *buffer, size_t *lenp, loff_t *ppos)
2537 {
2538         return -ENOSYS;
2539 }
2540
2541 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2542                                       struct file *filp,
2543                                       void __user *buffer,
2544                                       size_t *lenp, loff_t *ppos)
2545 {
2546     return -ENOSYS;
2547 }
2548
2549
2550 #endif /* CONFIG_PROC_FS */
2551
2552
2553 #ifdef CONFIG_SYSCTL_SYSCALL
2554 /*
2555  * General sysctl support routines
2556  */
2557
2558 /* The generic sysctl data routine (used if no strategy routine supplied) */
2559 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2560                 void __user *oldval, size_t __user *oldlenp,
2561                 void __user *newval, size_t newlen)
2562 {
2563         size_t len;
2564
2565         /* Get out of I don't have a variable */
2566         if (!table->data || !table->maxlen)
2567                 return -ENOTDIR;
2568
2569         if (oldval && oldlenp) {
2570                 if (get_user(len, oldlenp))
2571                         return -EFAULT;
2572                 if (len) {
2573                         if (len > table->maxlen)
2574                                 len = table->maxlen;
2575                         if (copy_to_user(oldval, table->data, len))
2576                                 return -EFAULT;
2577                         if (put_user(len, oldlenp))
2578                                 return -EFAULT;
2579                 }
2580         }
2581
2582         if (newval && newlen) {
2583                 if (newlen > table->maxlen)
2584                         newlen = table->maxlen;
2585
2586                 if (copy_from_user(table->data, newval, newlen))
2587                         return -EFAULT;
2588         }
2589         return 1;
2590 }
2591
2592 /* The generic string strategy routine: */
2593 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2594                   void __user *oldval, size_t __user *oldlenp,
2595                   void __user *newval, size_t newlen)
2596 {
2597         if (!table->data || !table->maxlen)
2598                 return -ENOTDIR;
2599
2600         if (oldval && oldlenp) {
2601                 size_t bufsize;
2602                 if (get_user(bufsize, oldlenp))
2603                         return -EFAULT;
2604                 if (bufsize) {
2605                         size_t len = strlen(table->data), copied;
2606
2607                         /* This shouldn't trigger for a well-formed sysctl */
2608                         if (len > table->maxlen)
2609                                 len = table->maxlen;
2610
2611                         /* Copy up to a max of bufsize-1 bytes of the string */
2612                         copied = (len >= bufsize) ? bufsize - 1 : len;
2613
2614                         if (copy_to_user(oldval, table->data, copied) ||
2615                             put_user(0, (char __user *)(oldval + copied)))
2616                                 return -EFAULT;
2617                         if (put_user(len, oldlenp))
2618                                 return -EFAULT;
2619                 }
2620         }
2621         if (newval && newlen) {
2622                 size_t len = newlen;
2623                 if (len > table->maxlen)
2624                         len = table->maxlen;
2625                 if(copy_from_user(table->data, newval, len))
2626                         return -EFAULT;
2627                 if (len == table->maxlen)
2628                         len--;
2629                 ((char *) table->data)[len] = 0;
2630         }
2631         return 1;
2632 }
2633
2634 /*
2635  * This function makes sure that all of the integers in the vector
2636  * are between the minimum and maximum values given in the arrays
2637  * table->extra1 and table->extra2, respectively.
2638  */
2639 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2640                 void __user *oldval, size_t __user *oldlenp,
2641                 void __user *newval, size_t newlen)
2642 {
2643
2644         if (newval && newlen) {
2645                 int __user *vec = (int __user *) newval;
2646                 int *min = (int *) table->extra1;
2647                 int *max = (int *) table->extra2;
2648                 size_t length;
2649                 int i;
2650
2651                 if (newlen % sizeof(int) != 0)
2652                         return -EINVAL;
2653
2654                 if (!table->extra1 && !table->extra2)
2655                         return 0;
2656
2657                 if (newlen > table->maxlen)
2658                         newlen = table->maxlen;
2659                 length = newlen / sizeof(int);
2660
2661                 for (i = 0; i < length; i++) {
2662                         int value;
2663                         if (get_user(value, vec + i))
2664                                 return -EFAULT;
2665                         if (min && value < min[i])
2666                                 return -EINVAL;
2667                         if (max && value > max[i])
2668                                 return -EINVAL;
2669                 }
2670         }
2671         return 0;
2672 }
2673
2674 /* Strategy function to convert jiffies to seconds */
2675 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2676                 void __user *oldval, size_t __user *oldlenp,
2677                 void __user *newval, size_t newlen)
2678 {
2679         if (oldval && oldlenp) {
2680                 size_t olen;
2681
2682                 if (get_user(olen, oldlenp))
2683                         return -EFAULT;
2684                 if (olen) {
2685                         int val;
2686
2687                         if (olen < sizeof(int))
2688                                 return -EINVAL;
2689
2690                         val = *(int *)(table->data) / HZ;
2691                         if (put_user(val, (int __user *)oldval))
2692                                 return -EFAULT;
2693                         if (put_user(sizeof(int), oldlenp))
2694                                 return -EFAULT;
2695                 }
2696         }
2697         if (newval && newlen) {
2698                 int new;
2699                 if (newlen != sizeof(int))
2700                         return -EINVAL;
2701                 if (get_user(new, (int __user *)newval))
2702                         return -EFAULT;
2703                 *(int *)(table->data) = new*HZ;
2704         }
2705         return 1;
2706 }
2707
2708 /* Strategy function to convert jiffies to seconds */
2709 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2710                 void __user *oldval, size_t __user *oldlenp,
2711                 void __user *newval, size_t newlen)
2712 {
2713         if (oldval && oldlenp) {
2714                 size_t olen;
2715
2716                 if (get_user(olen, oldlenp))
2717                         return -EFAULT;
2718                 if (olen) {
2719                         int val;
2720
2721                         if (olen < sizeof(int))
2722                                 return -EINVAL;
2723
2724                         val = jiffies_to_msecs(*(int *)(table->data));
2725                         if (put_user(val, (int __user *)oldval))
2726                                 return -EFAULT;
2727                         if (put_user(sizeof(int), oldlenp))
2728                                 return -EFAULT;
2729                 }
2730         }
2731         if (newval && newlen) {
2732                 int new;
2733                 if (newlen != sizeof(int))
2734                         return -EINVAL;
2735                 if (get_user(new, (int __user *)newval))
2736                         return -EFAULT;
2737                 *(int *)(table->data) = msecs_to_jiffies(new);
2738         }
2739         return 1;
2740 }
2741
2742
2743
2744 #else /* CONFIG_SYSCTL_SYSCALL */
2745
2746
2747 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2748 {
2749         struct __sysctl_args tmp;
2750         int error;
2751
2752         if (copy_from_user(&tmp, args, sizeof(tmp)))
2753                 return -EFAULT;
2754
2755         error = deprecated_sysctl_warning(&tmp);
2756
2757         /* If no error reading the parameters then just -ENOSYS ... */
2758         if (!error)
2759                 error = -ENOSYS;
2760
2761         return error;
2762 }
2763
2764 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2765                   void __user *oldval, size_t __user *oldlenp,
2766                   void __user *newval, size_t newlen)
2767 {
2768         return -ENOSYS;
2769 }
2770
2771 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2772                   void __user *oldval, size_t __user *oldlenp,
2773                   void __user *newval, size_t newlen)
2774 {
2775         return -ENOSYS;
2776 }
2777
2778 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2779                 void __user *oldval, size_t __user *oldlenp,
2780                 void __user *newval, size_t newlen)
2781 {
2782         return -ENOSYS;
2783 }
2784
2785 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2786                 void __user *oldval, size_t __user *oldlenp,
2787                 void __user *newval, size_t newlen)
2788 {
2789         return -ENOSYS;
2790 }
2791
2792 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2793                 void __user *oldval, size_t __user *oldlenp,
2794                 void __user *newval, size_t newlen)
2795 {
2796         return -ENOSYS;
2797 }
2798
2799 #endif /* CONFIG_SYSCTL_SYSCALL */
2800
2801 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2802 {
2803         static int msg_count;
2804         int name[CTL_MAXNAME];
2805         int i;
2806
2807         /* Check args->nlen. */
2808         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2809                 return -ENOTDIR;
2810
2811         /* Read in the sysctl name for better debug message logging */
2812         for (i = 0; i < args->nlen; i++)
2813                 if (get_user(name[i], args->name + i))
2814                         return -EFAULT;
2815
2816         /* Ignore accesses to kernel.version */
2817         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2818                 return 0;
2819
2820         if (msg_count < 5) {
2821                 msg_count++;
2822                 printk(KERN_INFO
2823                         "warning: process `%s' used the deprecated sysctl "
2824                         "system call with ", current->comm);
2825                 for (i = 0; i < args->nlen; i++)
2826                         printk("%d.", name[i]);
2827                 printk("\n");
2828         }
2829         return 0;
2830 }
2831
2832 /*
2833  * No sense putting this after each symbol definition, twice,
2834  * exception granted :-)
2835  */
2836 EXPORT_SYMBOL(proc_dointvec);
2837 EXPORT_SYMBOL(proc_dointvec_jiffies);
2838 EXPORT_SYMBOL(proc_dointvec_minmax);
2839 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2840 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2841 EXPORT_SYMBOL(proc_dostring);
2842 EXPORT_SYMBOL(proc_doulongvec_minmax);
2843 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2844 EXPORT_SYMBOL(register_sysctl_table);
2845 EXPORT_SYMBOL(register_sysctl_paths);
2846 EXPORT_SYMBOL(sysctl_intvec);
2847 EXPORT_SYMBOL(sysctl_jiffies);
2848 EXPORT_SYMBOL(sysctl_ms_jiffies);
2849 EXPORT_SYMBOL(sysctl_string);
2850 EXPORT_SYMBOL(sysctl_data);
2851 EXPORT_SYMBOL(unregister_sysctl_table);