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

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/key.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49 #include <linux/ftrace.h>
  50
  51 #include <asm/uaccess.h>
  52 #include <asm/processor.h>
  53
  54 #ifdef CONFIG_X86
  55 #include <asm/nmi.h>
  56 #include <asm/stacktrace.h>
  57 #include <asm/io.h>
  58 #endif
  59
  60 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  61
  62 #if defined(CONFIG_SYSCTL)
  63
  64 /* External variables not in a header file. */
  65 extern int C_A_D;
  66 extern int print_fatal_signals;
  67 extern int sysctl_overcommit_memory;
  68 extern int sysctl_overcommit_ratio;
  69 extern int sysctl_panic_on_oom;
  70 extern int sysctl_oom_kill_allocating_task;
  71 extern int sysctl_oom_dump_tasks;
  72 extern int max_threads;
  73 extern int core_uses_pid;
  74 extern int suid_dumpable;
  75 extern char core_pattern[];
  76 extern int pid_max;
  77 extern int min_free_kbytes;
  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 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  86
  87 /* Constants used for minimum and  maximum */
  88 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
  89 static int one = 1;
  90 #endif
  91
  92 #ifdef CONFIG_DETECT_SOFTLOCKUP
  93 static int sixty = 60;
  94 #endif
  95
  96 #ifdef CONFIG_MMU
  97 static int two = 2;
  98 #endif
  99
 100 static int zero;
 101 static int one_hundred = 100;
 102
 103 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 104 static int maxolduid = 65535;
 105 static int minolduid;
 106 static int min_percpu_pagelist_fract = 8;
 107
 108 static int ngroups_max = NGROUPS_MAX;
 109
 110 #ifdef CONFIG_KMOD
 111 extern char modprobe_path[];
 112 #endif
 113 #ifdef CONFIG_CHR_DEV_SG
 114 extern int sg_big_buff;
 115 #endif
 116
 117 #ifdef __sparc__
 118 extern char reboot_command [];
 119 extern int stop_a_enabled;
 120 extern int scons_pwroff;
 121 #endif
 122
 123 #ifdef __hppa__
 124 extern int pwrsw_enabled;
 125 extern int unaligned_enabled;
 126 #endif
 127
 128 #ifdef CONFIG_S390
 129 #ifdef CONFIG_MATHEMU
 130 extern int sysctl_ieee_emulation_warnings;
 131 #endif
 132 extern int sysctl_userprocess_debug;
 133 extern int spin_retry;
 134 #endif
 135
 136 #ifdef CONFIG_BSD_PROCESS_ACCT
 137 extern int acct_parm[];
 138 #endif
 139
 140 #ifdef CONFIG_IA64
 141 extern int no_unaligned_warning;
 142 #endif
 143
 144 #ifdef CONFIG_RT_MUTEXES
 145 extern int max_lock_depth;
 146 #endif
 147
 148 #ifdef CONFIG_PROC_SYSCTL
 149 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 150                   void __user *buffer, size_t *lenp, loff_t *ppos);
 151 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 152                                void __user *buffer, size_t *lenp, loff_t *ppos);
 153 #endif
 154
 155 static struct ctl_table root_table[];
 156 static struct ctl_table_root sysctl_table_root;
 157 static struct ctl_table_header root_table_header = {
 158         .ctl_table = root_table,
 159         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 160         .root = &sysctl_table_root,
 161 };
 162 static struct ctl_table_root sysctl_table_root = {
 163         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 164         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 165 };
 166
 167 static struct ctl_table kern_table[];
 168 static struct ctl_table vm_table[];
 169 static struct ctl_table fs_table[];
 170 static struct ctl_table debug_table[];
 171 static struct ctl_table dev_table[];
 172 extern struct ctl_table random_table[];
 173 #ifdef CONFIG_INOTIFY_USER
 174 extern struct ctl_table inotify_table[];
 175 #endif
 176
 177 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 178 int sysctl_legacy_va_layout;
 179 #endif
 180
 181 extern int prove_locking;
 182 extern int lock_stat;
 183
 184 /* The default sysctl tables: */
 185
 186 static struct ctl_table root_table[] = {
 187         {
 188                 .ctl_name       = CTL_KERN,
 189                 .procname       = "kernel",
 190                 .mode           = 0555,
 191                 .child          = kern_table,
 192         },
 193         {
 194                 .ctl_name       = CTL_VM,
 195                 .procname       = "vm",
 196                 .mode           = 0555,
 197                 .child          = vm_table,
 198         },
 199         {
 200                 .ctl_name       = CTL_FS,
 201                 .procname       = "fs",
 202                 .mode           = 0555,
 203                 .child          = fs_table,
 204         },
 205         {
 206                 .ctl_name       = CTL_DEBUG,
 207                 .procname       = "debug",
 208                 .mode           = 0555,
 209                 .child          = debug_table,
 210         },
 211         {
 212                 .ctl_name       = CTL_DEV,
 213                 .procname       = "dev",
 214                 .mode           = 0555,
 215                 .child          = dev_table,
 216         },
 217 /*
 218  * NOTE: do not add new entries to this table unless you have read
 219  * Documentation/sysctl/ctl_unnumbered.txt
 220  */
 221         { .ctl_name = 0 }
 222 };
 223
 224 #ifdef CONFIG_SCHED_DEBUG
 225 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 226 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 227 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 228 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 229 #endif
 230
 231 static struct ctl_table kern_table[] = {
 232 #ifdef CONFIG_SCHED_DEBUG
 233         {
 234                 .ctl_name       = CTL_UNNUMBERED,
 235                 .procname       = "sched_min_granularity_ns",
 236                 .data           = &sysctl_sched_min_granularity,
 237                 .maxlen         = sizeof(unsigned int),
 238                 .mode           = 0644,
 239                 .proc_handler   = &sched_nr_latency_handler,
 240                 .strategy       = &sysctl_intvec,
 241                 .extra1         = &min_sched_granularity_ns,
 242                 .extra2         = &max_sched_granularity_ns,
 243         },
 244         {
 245                 .ctl_name       = CTL_UNNUMBERED,
 246                 .procname       = "sched_latency_ns",
 247                 .data           = &sysctl_sched_latency,
 248                 .maxlen         = sizeof(unsigned int),
 249                 .mode           = 0644,
 250                 .proc_handler   = &sched_nr_latency_handler,
 251                 .strategy       = &sysctl_intvec,
 252                 .extra1         = &min_sched_granularity_ns,
 253                 .extra2         = &max_sched_granularity_ns,
 254         },
 255         {
 256                 .ctl_name       = CTL_UNNUMBERED,
 257                 .procname       = "sched_wakeup_granularity_ns",
 258                 .data           = &sysctl_sched_wakeup_granularity,
 259                 .maxlen         = sizeof(unsigned int),
 260                 .mode           = 0644,
 261                 .proc_handler   = &proc_dointvec_minmax,
 262                 .strategy       = &sysctl_intvec,
 263                 .extra1         = &min_wakeup_granularity_ns,
 264                 .extra2         = &max_wakeup_granularity_ns,
 265         },
 266         {
 267                 .ctl_name       = CTL_UNNUMBERED,
 268                 .procname       = "sched_shares_ratelimit",
 269                 .data           = &sysctl_sched_shares_ratelimit,
 270                 .maxlen         = sizeof(unsigned int),
 271                 .mode           = 0644,
 272                 .proc_handler   = &proc_dointvec,
 273         },
 274         {
 275                 .ctl_name       = CTL_UNNUMBERED,
 276                 .procname       = "sched_child_runs_first",
 277                 .data           = &sysctl_sched_child_runs_first,
 278                 .maxlen         = sizeof(unsigned int),
 279                 .mode           = 0644,
 280                 .proc_handler   = &proc_dointvec,
 281         },
 282         {
 283                 .ctl_name       = CTL_UNNUMBERED,
 284                 .procname       = "sched_features",
 285                 .data           = &sysctl_sched_features,
 286                 .maxlen         = sizeof(unsigned int),
 287                 .mode           = 0644,
 288                 .proc_handler   = &proc_dointvec,
 289         },
 290         {
 291                 .ctl_name       = CTL_UNNUMBERED,
 292                 .procname       = "sched_migration_cost",
 293                 .data           = &sysctl_sched_migration_cost,
 294                 .maxlen         = sizeof(unsigned int),
 295                 .mode           = 0644,
 296                 .proc_handler   = &proc_dointvec,
 297         },
 298         {
 299                 .ctl_name       = CTL_UNNUMBERED,
 300                 .procname       = "sched_nr_migrate",
 301                 .data           = &sysctl_sched_nr_migrate,
 302                 .maxlen         = sizeof(unsigned int),
 303                 .mode           = 0644,
 304                 .proc_handler   = &proc_dointvec,
 305         },
 306 #endif
 307         {
 308                 .ctl_name       = CTL_UNNUMBERED,
 309                 .procname       = "sched_rt_period_us",
 310                 .data           = &sysctl_sched_rt_period,
 311                 .maxlen         = sizeof(unsigned int),
 312                 .mode           = 0644,
 313                 .proc_handler   = &sched_rt_handler,
 314         },
 315         {
 316                 .ctl_name       = CTL_UNNUMBERED,
 317                 .procname       = "sched_rt_runtime_us",
 318                 .data           = &sysctl_sched_rt_runtime,
 319                 .maxlen         = sizeof(int),
 320                 .mode           = 0644,
 321                 .proc_handler   = &sched_rt_handler,
 322         },
 323         {
 324                 .ctl_name       = CTL_UNNUMBERED,
 325                 .procname       = "sched_compat_yield",
 326                 .data           = &sysctl_sched_compat_yield,
 327                 .maxlen         = sizeof(unsigned int),
 328                 .mode           = 0644,
 329                 .proc_handler   = &proc_dointvec,
 330         },
 331 #ifdef CONFIG_PROVE_LOCKING
 332         {
 333                 .ctl_name       = CTL_UNNUMBERED,
 334                 .procname       = "prove_locking",
 335                 .data           = &prove_locking,
 336                 .maxlen         = sizeof(int),
 337                 .mode           = 0644,
 338                 .proc_handler   = &proc_dointvec,
 339         },
 340 #endif
 341 #ifdef CONFIG_LOCK_STAT
 342         {
 343                 .ctl_name       = CTL_UNNUMBERED,
 344                 .procname       = "lock_stat",
 345                 .data           = &lock_stat,
 346                 .maxlen         = sizeof(int),
 347                 .mode           = 0644,
 348                 .proc_handler   = &proc_dointvec,
 349         },
 350 #endif
 351         {
 352                 .ctl_name       = KERN_PANIC,
 353                 .procname       = "panic",
 354                 .data           = &panic_timeout,
 355                 .maxlen         = sizeof(int),
 356                 .mode           = 0644,
 357                 .proc_handler   = &proc_dointvec,
 358         },
 359         {
 360                 .ctl_name       = KERN_CORE_USES_PID,
 361                 .procname       = "core_uses_pid",
 362                 .data           = &core_uses_pid,
 363                 .maxlen         = sizeof(int),
 364                 .mode           = 0644,
 365                 .proc_handler   = &proc_dointvec,
 366         },
 367         {
 368                 .ctl_name       = KERN_CORE_PATTERN,
 369                 .procname       = "core_pattern",
 370                 .data           = core_pattern,
 371                 .maxlen         = CORENAME_MAX_SIZE,
 372                 .mode           = 0644,
 373                 .proc_handler   = &proc_dostring,
 374                 .strategy       = &sysctl_string,
 375         },
 376 #ifdef CONFIG_PROC_SYSCTL
 377         {
 378                 .procname       = "tainted",
 379                 .data           = &tainted,
 380                 .maxlen         = sizeof(int),
 381                 .mode           = 0644,
 382                 .proc_handler   = &proc_dointvec_taint,
 383         },
 384 #endif
 385 #ifdef CONFIG_LATENCYTOP
 386         {
 387                 .procname       = "latencytop",
 388                 .data           = &latencytop_enabled,
 389                 .maxlen         = sizeof(int),
 390                 .mode           = 0644,
 391                 .proc_handler   = &proc_dointvec,
 392         },
 393 #endif
 394 #ifdef CONFIG_BLK_DEV_INITRD
 395         {
 396                 .ctl_name       = KERN_REALROOTDEV,
 397                 .procname       = "real-root-dev",
 398                 .data           = &real_root_dev,
 399                 .maxlen         = sizeof(int),
 400                 .mode           = 0644,
 401                 .proc_handler   = &proc_dointvec,
 402         },
 403 #endif
 404         {
 405                 .ctl_name       = CTL_UNNUMBERED,
 406                 .procname       = "print-fatal-signals",
 407                 .data           = &print_fatal_signals,
 408                 .maxlen         = sizeof(int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec,
 411         },
 412 #ifdef __sparc__
 413         {
 414                 .ctl_name       = KERN_SPARC_REBOOT,
 415                 .procname       = "reboot-cmd",
 416                 .data           = reboot_command,
 417                 .maxlen         = 256,
 418                 .mode           = 0644,
 419                 .proc_handler   = &proc_dostring,
 420                 .strategy       = &sysctl_string,
 421         },
 422         {
 423                 .ctl_name       = KERN_SPARC_STOP_A,
 424                 .procname       = "stop-a",
 425                 .data           = &stop_a_enabled,
 426                 .maxlen         = sizeof (int),
 427                 .mode           = 0644,
 428                 .proc_handler   = &proc_dointvec,
 429         },
 430         {
 431                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 432                 .procname       = "scons-poweroff",
 433                 .data           = &scons_pwroff,
 434                 .maxlen         = sizeof (int),
 435                 .mode           = 0644,
 436                 .proc_handler   = &proc_dointvec,
 437         },
 438 #endif
 439 #ifdef __hppa__
 440         {
 441                 .ctl_name       = KERN_HPPA_PWRSW,
 442                 .procname       = "soft-power",
 443                 .data           = &pwrsw_enabled,
 444                 .maxlen         = sizeof (int),
 445                 .mode           = 0644,
 446                 .proc_handler   = &proc_dointvec,
 447         },
 448         {
 449                 .ctl_name       = KERN_HPPA_UNALIGNED,
 450                 .procname       = "unaligned-trap",
 451                 .data           = &unaligned_enabled,
 452                 .maxlen         = sizeof (int),
 453                 .mode           = 0644,
 454                 .proc_handler   = &proc_dointvec,
 455         },
 456 #endif
 457         {
 458                 .ctl_name       = KERN_CTLALTDEL,
 459                 .procname       = "ctrl-alt-del",
 460                 .data           = &C_A_D,
 461                 .maxlen         = sizeof(int),
 462                 .mode           = 0644,
 463                 .proc_handler   = &proc_dointvec,
 464         },
 465 #ifdef CONFIG_FTRACE
 466         {
 467                 .ctl_name       = CTL_UNNUMBERED,
 468                 .procname       = "ftrace_enabled",
 469                 .data           = &ftrace_enabled,
 470                 .maxlen         = sizeof(int),
 471                 .mode           = 0644,
 472                 .proc_handler   = &ftrace_enable_sysctl,
 473         },
 474 #endif
 475 #ifdef CONFIG_KMOD
 476         {
 477                 .ctl_name       = KERN_MODPROBE,
 478                 .procname       = "modprobe",
 479                 .data           = &modprobe_path,
 480                 .maxlen         = KMOD_PATH_LEN,
 481                 .mode           = 0644,
 482                 .proc_handler   = &proc_dostring,
 483                 .strategy       = &sysctl_string,
 484         },
 485 #endif
 486 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 487         {
 488                 .ctl_name       = KERN_HOTPLUG,
 489                 .procname       = "hotplug",
 490                 .data           = &uevent_helper,
 491                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 492                 .mode           = 0644,
 493                 .proc_handler   = &proc_dostring,
 494                 .strategy       = &sysctl_string,
 495         },
 496 #endif
 497 #ifdef CONFIG_CHR_DEV_SG
 498         {
 499                 .ctl_name       = KERN_SG_BIG_BUFF,
 500                 .procname       = "sg-big-buff",
 501                 .data           = &sg_big_buff,
 502                 .maxlen         = sizeof (int),
 503                 .mode           = 0444,
 504                 .proc_handler   = &proc_dointvec,
 505         },
 506 #endif
 507 #ifdef CONFIG_BSD_PROCESS_ACCT
 508         {
 509                 .ctl_name       = KERN_ACCT,
 510                 .procname       = "acct",
 511                 .data           = &acct_parm,
 512                 .maxlen         = 3*sizeof(int),
 513                 .mode           = 0644,
 514                 .proc_handler   = &proc_dointvec,
 515         },
 516 #endif
 517 #ifdef CONFIG_MAGIC_SYSRQ
 518         {
 519                 .ctl_name       = KERN_SYSRQ,
 520                 .procname       = "sysrq",
 521                 .data           = &__sysrq_enabled,
 522                 .maxlen         = sizeof (int),
 523                 .mode           = 0644,
 524                 .proc_handler   = &proc_dointvec,
 525         },
 526 #endif
 527 #ifdef CONFIG_PROC_SYSCTL
 528         {
 529                 .procname       = "cad_pid",
 530                 .data           = NULL,
 531                 .maxlen         = sizeof (int),
 532                 .mode           = 0600,
 533                 .proc_handler   = &proc_do_cad_pid,
 534         },
 535 #endif
 536         {
 537                 .ctl_name       = KERN_MAX_THREADS,
 538                 .procname       = "threads-max",
 539                 .data           = &max_threads,
 540                 .maxlen         = sizeof(int),
 541                 .mode           = 0644,
 542                 .proc_handler   = &proc_dointvec,
 543         },
 544         {
 545                 .ctl_name       = KERN_RANDOM,
 546                 .procname       = "random",
 547                 .mode           = 0555,
 548                 .child          = random_table,
 549         },
 550         {
 551                 .ctl_name       = KERN_OVERFLOWUID,
 552                 .procname       = "overflowuid",
 553                 .data           = &overflowuid,
 554                 .maxlen         = sizeof(int),
 555                 .mode           = 0644,
 556                 .proc_handler   = &proc_dointvec_minmax,
 557                 .strategy       = &sysctl_intvec,
 558                 .extra1         = &minolduid,
 559                 .extra2         = &maxolduid,
 560         },
 561         {
 562                 .ctl_name       = KERN_OVERFLOWGID,
 563                 .procname       = "overflowgid",
 564                 .data           = &overflowgid,
 565                 .maxlen         = sizeof(int),
 566                 .mode           = 0644,
 567                 .proc_handler   = &proc_dointvec_minmax,
 568                 .strategy       = &sysctl_intvec,
 569                 .extra1         = &minolduid,
 570                 .extra2         = &maxolduid,
 571         },
 572 #ifdef CONFIG_S390
 573 #ifdef CONFIG_MATHEMU
 574         {
 575                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 576                 .procname       = "ieee_emulation_warnings",
 577                 .data           = &sysctl_ieee_emulation_warnings,
 578                 .maxlen         = sizeof(int),
 579                 .mode           = 0644,
 580                 .proc_handler   = &proc_dointvec,
 581         },
 582 #endif
 583         {
 584                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 585                 .procname       = "userprocess_debug",
 586                 .data           = &sysctl_userprocess_debug,
 587                 .maxlen         = sizeof(int),
 588                 .mode           = 0644,
 589                 .proc_handler   = &proc_dointvec,
 590         },
 591 #endif
 592         {
 593                 .ctl_name       = KERN_PIDMAX,
 594                 .procname       = "pid_max",
 595                 .data           = &pid_max,
 596                 .maxlen         = sizeof (int),
 597                 .mode           = 0644,
 598                 .proc_handler   = &proc_dointvec_minmax,
 599                 .strategy       = sysctl_intvec,
 600                 .extra1         = &pid_max_min,
 601                 .extra2         = &pid_max_max,
 602         },
 603         {
 604                 .ctl_name       = KERN_PANIC_ON_OOPS,
 605                 .procname       = "panic_on_oops",
 606                 .data           = &panic_on_oops,
 607                 .maxlen         = sizeof(int),
 608                 .mode           = 0644,
 609                 .proc_handler   = &proc_dointvec,
 610         },
 611 #if defined CONFIG_PRINTK
 612         {
 613                 .ctl_name       = KERN_PRINTK,
 614                 .procname       = "printk",
 615                 .data           = &console_loglevel,
 616                 .maxlen         = 4*sizeof(int),
 617                 .mode           = 0644,
 618                 .proc_handler   = &proc_dointvec,
 619         },
 620         {
 621                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 622                 .procname       = "printk_ratelimit",
 623                 .data           = &printk_ratelimit_jiffies,
 624                 .maxlen         = sizeof(int),
 625                 .mode           = 0644,
 626                 .proc_handler   = &proc_dointvec_jiffies,
 627                 .strategy       = &sysctl_jiffies,
 628         },
 629         {
 630                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 631                 .procname       = "printk_ratelimit_burst",
 632                 .data           = &printk_ratelimit_burst,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = &proc_dointvec,
 636         },
 637 #endif
 638         {
 639                 .ctl_name       = KERN_NGROUPS_MAX,
 640                 .procname       = "ngroups_max",
 641                 .data           = &ngroups_max,
 642                 .maxlen         = sizeof (int),
 643                 .mode           = 0444,
 644                 .proc_handler   = &proc_dointvec,
 645         },
 646 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 647         {
 648                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 649                 .procname       = "unknown_nmi_panic",
 650                 .data           = &unknown_nmi_panic,
 651                 .maxlen         = sizeof (int),
 652                 .mode           = 0644,
 653                 .proc_handler   = &proc_dointvec,
 654         },
 655         {
 656                 .procname       = "nmi_watchdog",
 657                 .data           = &nmi_watchdog_enabled,
 658                 .maxlen         = sizeof (int),
 659                 .mode           = 0644,
 660                 .proc_handler   = &proc_nmi_enabled,
 661         },
 662 #endif
 663 #if defined(CONFIG_X86)
 664         {
 665                 .ctl_name       = KERN_PANIC_ON_NMI,
 666                 .procname       = "panic_on_unrecovered_nmi",
 667                 .data           = &panic_on_unrecovered_nmi,
 668                 .maxlen         = sizeof(int),
 669                 .mode           = 0644,
 670                 .proc_handler   = &proc_dointvec,
 671         },
 672         {
 673                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 674                 .procname       = "bootloader_type",
 675                 .data           = &bootloader_type,
 676                 .maxlen         = sizeof (int),
 677                 .mode           = 0444,
 678                 .proc_handler   = &proc_dointvec,
 679         },
 680         {
 681                 .ctl_name       = CTL_UNNUMBERED,
 682                 .procname       = "kstack_depth_to_print",
 683                 .data           = &kstack_depth_to_print,
 684                 .maxlen         = sizeof(int),
 685                 .mode           = 0644,
 686                 .proc_handler   = &proc_dointvec,
 687         },
 688         {
 689                 .ctl_name       = CTL_UNNUMBERED,
 690                 .procname       = "io_delay_type",
 691                 .data           = &io_delay_type,
 692                 .maxlen         = sizeof(int),
 693                 .mode           = 0644,
 694                 .proc_handler   = &proc_dointvec,
 695         },
 696 #endif
 697 #if defined(CONFIG_MMU)
 698         {
 699                 .ctl_name       = KERN_RANDOMIZE,
 700                 .procname       = "randomize_va_space",
 701                 .data           = &randomize_va_space,
 702                 .maxlen         = sizeof(int),
 703                 .mode           = 0644,
 704                 .proc_handler   = &proc_dointvec,
 705         },
 706 #endif
 707 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 708         {
 709                 .ctl_name       = KERN_SPIN_RETRY,
 710                 .procname       = "spin_retry",
 711                 .data           = &spin_retry,
 712                 .maxlen         = sizeof (int),
 713                 .mode           = 0644,
 714                 .proc_handler   = &proc_dointvec,
 715         },
 716 #endif
 717 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 718         {
 719                 .procname       = "acpi_video_flags",
 720                 .data           = &acpi_realmode_flags,
 721                 .maxlen         = sizeof (unsigned long),
 722                 .mode           = 0644,
 723                 .proc_handler   = &proc_doulongvec_minmax,
 724         },
 725 #endif
 726 #ifdef CONFIG_IA64
 727         {
 728                 .ctl_name       = KERN_IA64_UNALIGNED,
 729                 .procname       = "ignore-unaligned-usertrap",
 730                 .data           = &no_unaligned_warning,
 731                 .maxlen         = sizeof (int),
 732                 .mode           = 0644,
 733                 .proc_handler   = &proc_dointvec,
 734         },
 735 #endif
 736 #ifdef CONFIG_DETECT_SOFTLOCKUP
 737         {
 738                 .ctl_name       = CTL_UNNUMBERED,
 739                 .procname       = "softlockup_thresh",
 740                 .data           = &softlockup_thresh,
 741                 .maxlen         = sizeof(unsigned long),
 742                 .mode           = 0644,
 743                 .proc_handler   = &proc_doulongvec_minmax,
 744                 .strategy       = &sysctl_intvec,
 745                 .extra1         = &one,
 746                 .extra2         = &sixty,
 747         },
 748         {
 749                 .ctl_name       = CTL_UNNUMBERED,
 750                 .procname       = "hung_task_check_count",
 751                 .data           = &sysctl_hung_task_check_count,
 752                 .maxlen         = sizeof(unsigned long),
 753                 .mode           = 0644,
 754                 .proc_handler   = &proc_doulongvec_minmax,
 755                 .strategy       = &sysctl_intvec,
 756         },
 757         {
 758                 .ctl_name       = CTL_UNNUMBERED,
 759                 .procname       = "hung_task_timeout_secs",
 760                 .data           = &sysctl_hung_task_timeout_secs,
 761                 .maxlen         = sizeof(unsigned long),
 762                 .mode           = 0644,
 763                 .proc_handler   = &proc_doulongvec_minmax,
 764                 .strategy       = &sysctl_intvec,
 765         },
 766         {
 767                 .ctl_name       = CTL_UNNUMBERED,
 768                 .procname       = "hung_task_warnings",
 769                 .data           = &sysctl_hung_task_warnings,
 770                 .maxlen         = sizeof(unsigned long),
 771                 .mode           = 0644,
 772                 .proc_handler   = &proc_doulongvec_minmax,
 773                 .strategy       = &sysctl_intvec,
 774         },
 775 #endif
 776 #ifdef CONFIG_COMPAT
 777         {
 778                 .ctl_name       = KERN_COMPAT_LOG,
 779                 .procname       = "compat-log",
 780                 .data           = &compat_log,
 781                 .maxlen         = sizeof (int),
 782                 .mode           = 0644,
 783                 .proc_handler   = &proc_dointvec,
 784         },
 785 #endif
 786 #ifdef CONFIG_RT_MUTEXES
 787         {
 788                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 789                 .procname       = "max_lock_depth",
 790                 .data           = &max_lock_depth,
 791                 .maxlen         = sizeof(int),
 792                 .mode           = 0644,
 793                 .proc_handler   = &proc_dointvec,
 794         },
 795 #endif
 796 #ifdef CONFIG_PROC_FS
 797         {
 798                 .ctl_name       = CTL_UNNUMBERED,
 799                 .procname       = "maps_protect",
 800                 .data           = &maps_protect,
 801                 .maxlen         = sizeof(int),
 802                 .mode           = 0644,
 803                 .proc_handler   = &proc_dointvec,
 804         },
 805 #endif
 806         {
 807                 .ctl_name       = CTL_UNNUMBERED,
 808                 .procname       = "poweroff_cmd",
 809                 .data           = &poweroff_cmd,
 810                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 811                 .mode           = 0644,
 812                 .proc_handler   = &proc_dostring,
 813                 .strategy       = &sysctl_string,
 814         },
 815 #ifdef CONFIG_KEYS
 816         {
 817                 .ctl_name       = CTL_UNNUMBERED,
 818                 .procname       = "keys",
 819                 .mode           = 0555,
 820                 .child          = key_sysctls,
 821         },
 822 #endif
 823 /*
 824  * NOTE: do not add new entries to this table unless you have read
 825  * Documentation/sysctl/ctl_unnumbered.txt
 826  */
 827         { .ctl_name = 0 }
 828 };
 829
 830 static struct ctl_table vm_table[] = {
 831         {
 832                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 833                 .procname       = "overcommit_memory",
 834                 .data           = &sysctl_overcommit_memory,
 835                 .maxlen         = sizeof(sysctl_overcommit_memory),
 836                 .mode           = 0644,
 837                 .proc_handler   = &proc_dointvec,
 838         },
 839         {
 840                 .ctl_name       = VM_PANIC_ON_OOM,
 841                 .procname       = "panic_on_oom",
 842                 .data           = &sysctl_panic_on_oom,
 843                 .maxlen         = sizeof(sysctl_panic_on_oom),
 844                 .mode           = 0644,
 845                 .proc_handler   = &proc_dointvec,
 846         },
 847         {
 848                 .ctl_name       = CTL_UNNUMBERED,
 849                 .procname       = "oom_kill_allocating_task",
 850                 .data           = &sysctl_oom_kill_allocating_task,
 851                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 852                 .mode           = 0644,
 853                 .proc_handler   = &proc_dointvec,
 854         },
 855         {
 856                 .ctl_name       = CTL_UNNUMBERED,
 857                 .procname       = "oom_dump_tasks",
 858                 .data           = &sysctl_oom_dump_tasks,
 859                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 860                 .mode           = 0644,
 861                 .proc_handler   = &proc_dointvec,
 862         },
 863         {
 864                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 865                 .procname       = "overcommit_ratio",
 866                 .data           = &sysctl_overcommit_ratio,
 867                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 868                 .mode           = 0644,
 869                 .proc_handler   = &proc_dointvec,
 870         },
 871         {
 872                 .ctl_name       = VM_PAGE_CLUSTER,
 873                 .procname       = "page-cluster",
 874                 .data           = &page_cluster,
 875                 .maxlen         = sizeof(int),
 876                 .mode           = 0644,
 877                 .proc_handler   = &proc_dointvec,
 878         },
 879         {
 880                 .ctl_name       = VM_DIRTY_BACKGROUND,
 881                 .procname       = "dirty_background_ratio",
 882                 .data           = &dirty_background_ratio,
 883                 .maxlen         = sizeof(dirty_background_ratio),
 884                 .mode           = 0644,
 885                 .proc_handler   = &proc_dointvec_minmax,
 886                 .strategy       = &sysctl_intvec,
 887                 .extra1         = &zero,
 888                 .extra2         = &one_hundred,
 889         },
 890         {
 891                 .ctl_name       = VM_DIRTY_RATIO,
 892                 .procname       = "dirty_ratio",
 893                 .data           = &vm_dirty_ratio,
 894                 .maxlen         = sizeof(vm_dirty_ratio),
 895                 .mode           = 0644,
 896                 .proc_handler   = &dirty_ratio_handler,
 897                 .strategy       = &sysctl_intvec,
 898                 .extra1         = &zero,
 899                 .extra2         = &one_hundred,
 900         },
 901         {
 902                 .procname       = "dirty_writeback_centisecs",
 903                 .data           = &dirty_writeback_interval,
 904                 .maxlen         = sizeof(dirty_writeback_interval),
 905                 .mode           = 0644,
 906                 .proc_handler   = &dirty_writeback_centisecs_handler,
 907         },
 908         {
 909                 .procname       = "dirty_expire_centisecs",
 910                 .data           = &dirty_expire_interval,
 911                 .maxlen         = sizeof(dirty_expire_interval),
 912                 .mode           = 0644,
 913                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 914         },
 915         {
 916                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 917                 .procname       = "nr_pdflush_threads",
 918                 .data           = &nr_pdflush_threads,
 919                 .maxlen         = sizeof nr_pdflush_threads,
 920                 .mode           = 0444 /* read-only*/,
 921                 .proc_handler   = &proc_dointvec,
 922         },
 923         {
 924                 .ctl_name       = VM_SWAPPINESS,
 925                 .procname       = "swappiness",
 926                 .data           = &vm_swappiness,
 927                 .maxlen         = sizeof(vm_swappiness),
 928                 .mode           = 0644,
 929                 .proc_handler   = &proc_dointvec_minmax,
 930                 .strategy       = &sysctl_intvec,
 931                 .extra1         = &zero,
 932                 .extra2         = &one_hundred,
 933         },
 934 #ifdef CONFIG_HUGETLB_PAGE
 935          {
 936                 .procname       = "nr_hugepages",
 937                 .data           = &max_huge_pages,
 938                 .maxlen         = sizeof(unsigned long),
 939                 .mode           = 0644,
 940                 .proc_handler   = &hugetlb_sysctl_handler,
 941                 .extra1         = (void *)&hugetlb_zero,
 942                 .extra2         = (void *)&hugetlb_infinity,
 943          },
 944          {
 945                 .ctl_name       = VM_HUGETLB_GROUP,
 946                 .procname       = "hugetlb_shm_group",
 947                 .data           = &sysctl_hugetlb_shm_group,
 948                 .maxlen         = sizeof(gid_t),
 949                 .mode           = 0644,
 950                 .proc_handler   = &proc_dointvec,
 951          },
 952          {
 953                 .ctl_name       = CTL_UNNUMBERED,
 954                 .procname       = "hugepages_treat_as_movable",
 955                 .data           = &hugepages_treat_as_movable,
 956                 .maxlen         = sizeof(int),
 957                 .mode           = 0644,
 958                 .proc_handler   = &hugetlb_treat_movable_handler,
 959         },
 960         {
 961                 .ctl_name       = CTL_UNNUMBERED,
 962                 .procname       = "nr_overcommit_hugepages",
 963                 .data           = &sysctl_overcommit_huge_pages,
 964                 .maxlen         = sizeof(sysctl_overcommit_huge_pages),
 965                 .mode           = 0644,
 966                 .proc_handler   = &hugetlb_overcommit_handler,
 967         },
 968 #endif
 969         {
 970                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 971                 .procname       = "lowmem_reserve_ratio",
 972                 .data           = &sysctl_lowmem_reserve_ratio,
 973                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 974                 .mode           = 0644,
 975                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 976                 .strategy       = &sysctl_intvec,
 977         },
 978         {
 979                 .ctl_name       = VM_DROP_PAGECACHE,
 980                 .procname       = "drop_caches",
 981                 .data           = &sysctl_drop_caches,
 982                 .maxlen         = sizeof(int),
 983                 .mode           = 0644,
 984                 .proc_handler   = drop_caches_sysctl_handler,
 985                 .strategy       = &sysctl_intvec,
 986         },
 987         {
 988                 .ctl_name       = VM_MIN_FREE_KBYTES,
 989                 .procname       = "min_free_kbytes",
 990                 .data           = &min_free_kbytes,
 991                 .maxlen         = sizeof(min_free_kbytes),
 992                 .mode           = 0644,
 993                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 994                 .strategy       = &sysctl_intvec,
 995                 .extra1         = &zero,
 996         },
 997         {
 998                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 999                 .procname       = "percpu_pagelist_fraction",
1000                 .data           = &percpu_pagelist_fraction,
1001                 .maxlen         = sizeof(percpu_pagelist_fraction),
1002                 .mode           = 0644,
1003                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1004                 .strategy       = &sysctl_intvec,
1005                 .extra1         = &min_percpu_pagelist_fract,
1006         },
1007 #ifdef CONFIG_MMU
1008         {
1009                 .ctl_name       = VM_MAX_MAP_COUNT,
1010                 .procname       = "max_map_count",
1011                 .data           = &sysctl_max_map_count,
1012                 .maxlen         = sizeof(sysctl_max_map_count),
1013                 .mode           = 0644,
1014                 .proc_handler   = &proc_dointvec
1015         },
1016 #endif
1017         {
1018                 .ctl_name       = VM_LAPTOP_MODE,
1019                 .procname       = "laptop_mode",
1020                 .data           = &laptop_mode,
1021                 .maxlen         = sizeof(laptop_mode),
1022                 .mode           = 0644,
1023                 .proc_handler   = &proc_dointvec_jiffies,
1024                 .strategy       = &sysctl_jiffies,
1025         },
1026         {
1027                 .ctl_name       = VM_BLOCK_DUMP,
1028                 .procname       = "block_dump",
1029                 .data           = &block_dump,
1030                 .maxlen         = sizeof(block_dump),
1031                 .mode           = 0644,
1032                 .proc_handler   = &proc_dointvec,
1033                 .strategy       = &sysctl_intvec,
1034                 .extra1         = &zero,
1035         },
1036         {
1037                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1038                 .procname       = "vfs_cache_pressure",
1039                 .data           = &sysctl_vfs_cache_pressure,
1040                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1041                 .mode           = 0644,
1042                 .proc_handler   = &proc_dointvec,
1043                 .strategy       = &sysctl_intvec,
1044                 .extra1         = &zero,
1045         },
1046 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1047         {
1048                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1049                 .procname       = "legacy_va_layout",
1050                 .data           = &sysctl_legacy_va_layout,
1051                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1052                 .mode           = 0644,
1053                 .proc_handler   = &proc_dointvec,
1054                 .strategy       = &sysctl_intvec,
1055                 .extra1         = &zero,
1056         },
1057 #endif
1058 #ifdef CONFIG_NUMA
1059         {
1060                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1061                 .procname       = "zone_reclaim_mode",
1062                 .data           = &zone_reclaim_mode,
1063                 .maxlen         = sizeof(zone_reclaim_mode),
1064                 .mode           = 0644,
1065                 .proc_handler   = &proc_dointvec,
1066                 .strategy       = &sysctl_intvec,
1067                 .extra1         = &zero,
1068         },
1069         {
1070                 .ctl_name       = VM_MIN_UNMAPPED,
1071                 .procname       = "min_unmapped_ratio",
1072                 .data           = &sysctl_min_unmapped_ratio,
1073                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1074                 .mode           = 0644,
1075                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1076                 .strategy       = &sysctl_intvec,
1077                 .extra1         = &zero,
1078                 .extra2         = &one_hundred,
1079         },
1080         {
1081                 .ctl_name       = VM_MIN_SLAB,
1082                 .procname       = "min_slab_ratio",
1083                 .data           = &sysctl_min_slab_ratio,
1084                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1085                 .mode           = 0644,
1086                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1087                 .strategy       = &sysctl_intvec,
1088                 .extra1         = &zero,
1089                 .extra2         = &one_hundred,
1090         },
1091 #endif
1092 #ifdef CONFIG_SMP
1093         {
1094                 .ctl_name       = CTL_UNNUMBERED,
1095                 .procname       = "stat_interval",
1096                 .data           = &sysctl_stat_interval,
1097                 .maxlen         = sizeof(sysctl_stat_interval),
1098                 .mode           = 0644,
1099                 .proc_handler   = &proc_dointvec_jiffies,
1100                 .strategy       = &sysctl_jiffies,
1101         },
1102 #endif
1103 #ifdef CONFIG_SECURITY
1104         {
1105                 .ctl_name       = CTL_UNNUMBERED,
1106                 .procname       = "mmap_min_addr",
1107                 .data           = &mmap_min_addr,
1108                 .maxlen         = sizeof(unsigned long),
1109                 .mode           = 0644,
1110                 .proc_handler   = &proc_doulongvec_minmax,
1111         },
1112 #endif
1113 #ifdef CONFIG_NUMA
1114         {
1115                 .ctl_name       = CTL_UNNUMBERED,
1116                 .procname       = "numa_zonelist_order",
1117                 .data           = &numa_zonelist_order,
1118                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1119                 .mode           = 0644,
1120                 .proc_handler   = &numa_zonelist_order_handler,
1121                 .strategy       = &sysctl_string,
1122         },
1123 #endif
1124 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1125    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1126         {
1127                 .ctl_name       = VM_VDSO_ENABLED,
1128                 .procname       = "vdso_enabled",
1129                 .data           = &vdso_enabled,
1130                 .maxlen         = sizeof(vdso_enabled),
1131                 .mode           = 0644,
1132                 .proc_handler   = &proc_dointvec,
1133                 .strategy       = &sysctl_intvec,
1134                 .extra1         = &zero,
1135         },
1136 #endif
1137 #ifdef CONFIG_HIGHMEM
1138         {
1139                 .ctl_name       = CTL_UNNUMBERED,
1140                 .procname       = "highmem_is_dirtyable",
1141                 .data           = &vm_highmem_is_dirtyable,
1142                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1143                 .mode           = 0644,
1144                 .proc_handler   = &proc_dointvec_minmax,
1145                 .strategy       = &sysctl_intvec,
1146                 .extra1         = &zero,
1147                 .extra2         = &one,
1148         },
1149 #endif
1150 /*
1151  * NOTE: do not add new entries to this table unless you have read
1152  * Documentation/sysctl/ctl_unnumbered.txt
1153  */
1154         { .ctl_name = 0 }
1155 };
1156
1157 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1158 static struct ctl_table binfmt_misc_table[] = {
1159         { .ctl_name = 0 }
1160 };
1161 #endif
1162
1163 static struct ctl_table fs_table[] = {
1164         {
1165                 .ctl_name       = FS_NRINODE,
1166                 .procname       = "inode-nr",
1167                 .data           = &inodes_stat,
1168                 .maxlen         = 2*sizeof(int),
1169                 .mode           = 0444,
1170                 .proc_handler   = &proc_dointvec,
1171         },
1172         {
1173                 .ctl_name       = FS_STATINODE,
1174                 .procname       = "inode-state",
1175                 .data           = &inodes_stat,
1176                 .maxlen         = 7*sizeof(int),
1177                 .mode           = 0444,
1178                 .proc_handler   = &proc_dointvec,
1179         },
1180         {
1181                 .procname       = "file-nr",
1182                 .data           = &files_stat,
1183                 .maxlen         = 3*sizeof(int),
1184                 .mode           = 0444,
1185                 .proc_handler   = &proc_nr_files,
1186         },
1187         {
1188                 .ctl_name       = FS_MAXFILE,
1189                 .procname       = "file-max",
1190                 .data           = &files_stat.max_files,
1191                 .maxlen         = sizeof(int),
1192                 .mode           = 0644,
1193                 .proc_handler   = &proc_dointvec,
1194         },
1195         {
1196                 .ctl_name       = CTL_UNNUMBERED,
1197                 .procname       = "nr_open",
1198                 .data           = &sysctl_nr_open,
1199                 .maxlen         = sizeof(int),
1200                 .mode           = 0644,
1201                 .proc_handler   = &proc_dointvec_minmax,
1202                 .extra1         = &sysctl_nr_open_min,
1203                 .extra2         = &sysctl_nr_open_max,
1204         },
1205         {
1206                 .ctl_name       = FS_DENTRY,
1207                 .procname       = "dentry-state",
1208                 .data           = &dentry_stat,
1209                 .maxlen         = 6*sizeof(int),
1210                 .mode           = 0444,
1211                 .proc_handler   = &proc_dointvec,
1212         },
1213         {
1214                 .ctl_name       = FS_OVERFLOWUID,
1215                 .procname       = "overflowuid",
1216                 .data           = &fs_overflowuid,
1217                 .maxlen         = sizeof(int),
1218                 .mode           = 0644,
1219                 .proc_handler   = &proc_dointvec_minmax,
1220                 .strategy       = &sysctl_intvec,
1221                 .extra1         = &minolduid,
1222                 .extra2         = &maxolduid,
1223         },
1224         {
1225                 .ctl_name       = FS_OVERFLOWGID,
1226                 .procname       = "overflowgid",
1227                 .data           = &fs_overflowgid,
1228                 .maxlen         = sizeof(int),
1229                 .mode           = 0644,
1230                 .proc_handler   = &proc_dointvec_minmax,
1231                 .strategy       = &sysctl_intvec,
1232                 .extra1         = &minolduid,
1233                 .extra2         = &maxolduid,
1234         },
1235         {
1236                 .ctl_name       = FS_LEASES,
1237                 .procname       = "leases-enable",
1238                 .data           = &leases_enable,
1239                 .maxlen         = sizeof(int),
1240                 .mode           = 0644,
1241                 .proc_handler   = &proc_dointvec,
1242         },
1243 #ifdef CONFIG_DNOTIFY
1244         {
1245                 .ctl_name       = FS_DIR_NOTIFY,
1246                 .procname       = "dir-notify-enable",
1247                 .data           = &dir_notify_enable,
1248                 .maxlen         = sizeof(int),
1249                 .mode           = 0644,
1250                 .proc_handler   = &proc_dointvec,
1251         },
1252 #endif
1253 #ifdef CONFIG_MMU
1254         {
1255                 .ctl_name       = FS_LEASE_TIME,
1256                 .procname       = "lease-break-time",
1257                 .data           = &lease_break_time,
1258                 .maxlen         = sizeof(int),
1259                 .mode           = 0644,
1260                 .proc_handler   = &proc_dointvec_minmax,
1261                 .strategy       = &sysctl_intvec,
1262                 .extra1         = &zero,
1263                 .extra2         = &two,
1264         },
1265         {
1266                 .procname       = "aio-nr",
1267                 .data           = &aio_nr,
1268                 .maxlen         = sizeof(aio_nr),
1269                 .mode           = 0444,
1270                 .proc_handler   = &proc_doulongvec_minmax,
1271         },
1272         {
1273                 .procname       = "aio-max-nr",
1274                 .data           = &aio_max_nr,
1275                 .maxlen         = sizeof(aio_max_nr),
1276                 .mode           = 0644,
1277                 .proc_handler   = &proc_doulongvec_minmax,
1278         },
1279 #ifdef CONFIG_INOTIFY_USER
1280         {
1281                 .ctl_name       = FS_INOTIFY,
1282                 .procname       = "inotify",
1283                 .mode           = 0555,
1284                 .child          = inotify_table,
1285         },
1286 #endif
1287 #endif
1288         {
1289                 .ctl_name       = KERN_SETUID_DUMPABLE,
1290                 .procname       = "suid_dumpable",
1291                 .data           = &suid_dumpable,
1292                 .maxlen         = sizeof(int),
1293                 .mode           = 0644,
1294                 .proc_handler   = &proc_dointvec,
1295         },
1296 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1297         {
1298                 .ctl_name       = CTL_UNNUMBERED,
1299                 .procname       = "binfmt_misc",
1300                 .mode           = 0555,
1301                 .child          = binfmt_misc_table,
1302         },
1303 #endif
1304 /*
1305  * NOTE: do not add new entries to this table unless you have read
1306  * Documentation/sysctl/ctl_unnumbered.txt
1307  */
1308         { .ctl_name = 0 }
1309 };
1310
1311 static struct ctl_table debug_table[] = {
1312 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1313         {
1314                 .ctl_name       = CTL_UNNUMBERED,
1315                 .procname       = "exception-trace",
1316                 .data           = &show_unhandled_signals,
1317                 .maxlen         = sizeof(int),
1318                 .mode           = 0644,
1319                 .proc_handler   = proc_dointvec
1320         },
1321 #endif
1322         { .ctl_name = 0 }
1323 };
1324
1325 static struct ctl_table dev_table[] = {
1326         { .ctl_name = 0 }
1327 };
1328
1329 static DEFINE_SPINLOCK(sysctl_lock);
1330
1331 /* called under sysctl_lock */
1332 static int use_table(struct ctl_table_header *p)
1333 {
1334         if (unlikely(p->unregistering))
1335                 return 0;
1336         p->used++;
1337         return 1;
1338 }
1339
1340 /* called under sysctl_lock */
1341 static void unuse_table(struct ctl_table_header *p)
1342 {
1343         if (!--p->used)
1344                 if (unlikely(p->unregistering))
1345                         complete(p->unregistering);
1346 }
1347
1348 /* called under sysctl_lock, will reacquire if has to wait */
1349 static void start_unregistering(struct ctl_table_header *p)
1350 {
1351         /*
1352          * if p->used is 0, nobody will ever touch that entry again;
1353          * we'll eliminate all paths to it before dropping sysctl_lock
1354          */
1355         if (unlikely(p->used)) {
1356                 struct completion wait;
1357                 init_completion(&wait);
1358                 p->unregistering = &wait;
1359                 spin_unlock(&sysctl_lock);
1360                 wait_for_completion(&wait);
1361                 spin_lock(&sysctl_lock);
1362         }
1363         /*
1364          * do not remove from the list until nobody holds it; walking the
1365          * list in do_sysctl() relies on that.
1366          */
1367         list_del_init(&p->ctl_entry);
1368 }
1369
1370 void sysctl_head_finish(struct ctl_table_header *head)
1371 {
1372         if (!head)
1373                 return;
1374         spin_lock(&sysctl_lock);
1375         unuse_table(head);
1376         spin_unlock(&sysctl_lock);
1377 }
1378
1379 static struct list_head *
1380 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1381 {
1382         struct list_head *header_list;
1383         header_list = &root->header_list;
1384         if (root->lookup)
1385                 header_list = root->lookup(root, namespaces);
1386         return header_list;
1387 }
1388
1389 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1390                                             struct ctl_table_header *prev)
1391 {
1392         struct ctl_table_root *root;
1393         struct list_head *header_list;
1394         struct ctl_table_header *head;
1395         struct list_head *tmp;
1396
1397         spin_lock(&sysctl_lock);
1398         if (prev) {
1399                 head = prev;
1400                 tmp = &prev->ctl_entry;
1401                 unuse_table(prev);
1402                 goto next;
1403         }
1404         tmp = &root_table_header.ctl_entry;
1405         for (;;) {
1406                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1407
1408                 if (!use_table(head))
1409                         goto next;
1410                 spin_unlock(&sysctl_lock);
1411                 return head;
1412         next:
1413                 root = head->root;
1414                 tmp = tmp->next;
1415                 header_list = lookup_header_list(root, namespaces);
1416                 if (tmp != header_list)
1417                         continue;
1418
1419                 do {
1420                         root = list_entry(root->root_list.next,
1421                                         struct ctl_table_root, root_list);
1422                         if (root == &sysctl_table_root)
1423                                 goto out;
1424                         header_list = lookup_header_list(root, namespaces);
1425                 } while (list_empty(header_list));
1426                 tmp = header_list->next;
1427         }
1428 out:
1429         spin_unlock(&sysctl_lock);
1430         return NULL;
1431 }
1432
1433 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1434 {
1435         return __sysctl_head_next(current->nsproxy, prev);
1436 }
1437
1438 void register_sysctl_root(struct ctl_table_root *root)
1439 {
1440         spin_lock(&sysctl_lock);
1441         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1442         spin_unlock(&sysctl_lock);
1443 }
1444
1445 #ifdef CONFIG_SYSCTL_SYSCALL
1446 /* Perform the actual read/write of a sysctl table entry. */
1447 static int do_sysctl_strategy(struct ctl_table_root *root,
1448                         struct ctl_table *table,
1449                         int __user *name, int nlen,
1450                         void __user *oldval, size_t __user *oldlenp,
1451                         void __user *newval, size_t newlen)
1452 {
1453         int op = 0, rc;
1454
1455         if (oldval)
1456                 op |= 004;
1457         if (newval)
1458                 op |= 002;
1459         if (sysctl_perm(root, table, op))
1460                 return -EPERM;
1461
1462         if (table->strategy) {
1463                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1464                                      newval, newlen);
1465                 if (rc < 0)
1466                         return rc;
1467                 if (rc > 0)
1468                         return 0;
1469         }
1470
1471         /* If there is no strategy routine, or if the strategy returns
1472          * zero, proceed with automatic r/w */
1473         if (table->data && table->maxlen) {
1474                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1475                                  newval, newlen);
1476                 if (rc < 0)
1477                         return rc;
1478         }
1479         return 0;
1480 }
1481
1482 static int parse_table(int __user *name, int nlen,
1483                        void __user *oldval, size_t __user *oldlenp,
1484                        void __user *newval, size_t newlen,
1485                        struct ctl_table_root *root,
1486                        struct ctl_table *table)
1487 {
1488         int n;
1489 repeat:
1490         if (!nlen)
1491                 return -ENOTDIR;
1492         if (get_user(n, name))
1493                 return -EFAULT;
1494         for ( ; table->ctl_name || table->procname; table++) {
1495                 if (!table->ctl_name)
1496                         continue;
1497                 if (n == table->ctl_name) {
1498                         int error;
1499                         if (table->child) {
1500                                 if (sysctl_perm(root, table, 001))
1501                                         return -EPERM;
1502                                 name++;
1503                                 nlen--;
1504                                 table = table->child;
1505                                 goto repeat;
1506                         }
1507                         error = do_sysctl_strategy(root, table, name, nlen,
1508                                                    oldval, oldlenp,
1509                                                    newval, newlen);
1510                         return error;
1511                 }
1512         }
1513         return -ENOTDIR;
1514 }
1515
1516 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1517                void __user *newval, size_t newlen)
1518 {
1519         struct ctl_table_header *head;
1520         int error = -ENOTDIR;
1521
1522         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1523                 return -ENOTDIR;
1524         if (oldval) {
1525                 int old_len;
1526                 if (!oldlenp || get_user(old_len, oldlenp))
1527                         return -EFAULT;
1528         }
1529
1530         for (head = sysctl_head_next(NULL); head;
1531                         head = sysctl_head_next(head)) {
1532                 error = parse_table(name, nlen, oldval, oldlenp,
1533                                         newval, newlen,
1534                                         head->root, head->ctl_table);
1535                 if (error != -ENOTDIR) {
1536                         sysctl_head_finish(head);
1537                         break;
1538                 }
1539         }
1540         return error;
1541 }
1542
1543 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1544 {
1545         struct __sysctl_args tmp;
1546         int error;
1547
1548         if (copy_from_user(&tmp, args, sizeof(tmp)))
1549                 return -EFAULT;
1550
1551         error = deprecated_sysctl_warning(&tmp);
1552         if (error)
1553                 goto out;
1554
1555         lock_kernel();
1556         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1557                           tmp.newval, tmp.newlen);
1558         unlock_kernel();
1559 out:
1560         return error;
1561 }
1562 #endif /* CONFIG_SYSCTL_SYSCALL */
1563
1564 /*
1565  * sysctl_perm does NOT grant the superuser all rights automatically, because
1566  * some sysctl variables are readonly even to root.
1567  */
1568
1569 static int test_perm(int mode, int op)
1570 {
1571         if (!current->euid)
1572                 mode >>= 6;
1573         else if (in_egroup_p(0))
1574                 mode >>= 3;
1575         if ((mode & op & 0007) == op)
1576                 return 0;
1577         return -EACCES;
1578 }
1579
1580 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1581 {
1582         int error;
1583         int mode;
1584
1585         error = security_sysctl(table, op);
1586         if (error)
1587                 return error;
1588
1589         if (root->permissions)
1590                 mode = root->permissions(root, current->nsproxy, table);
1591         else
1592                 mode = table->mode;
1593
1594         return test_perm(mode, op);
1595 }
1596
1597 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1598 {
1599         for (; table->ctl_name || table->procname; table++) {
1600                 table->parent = parent;
1601                 if (table->child)
1602                         sysctl_set_parent(table, table->child);
1603         }
1604 }
1605
1606 static __init int sysctl_init(void)
1607 {
1608         sysctl_set_parent(NULL, root_table);
1609 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1610         {
1611                 int err;
1612                 err = sysctl_check_table(current->nsproxy, root_table);
1613         }
1614 #endif
1615         return 0;
1616 }
1617
1618 core_initcall(sysctl_init);
1619
1620 /**
1621  * __register_sysctl_paths - register a sysctl hierarchy
1622  * @root: List of sysctl headers to register on
1623  * @namespaces: Data to compute which lists of sysctl entries are visible
1624  * @path: The path to the directory the sysctl table is in.
1625  * @table: the top-level table structure
1626  *
1627  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1628  * array. A completely 0 filled entry terminates the table.
1629  *
1630  * The members of the &struct ctl_table structure are used as follows:
1631  *
1632  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1633  *            must be unique within that level of sysctl
1634  *
1635  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1636  *            enter a sysctl file
1637  *
1638  * data - a pointer to data for use by proc_handler
1639  *
1640  * maxlen - the maximum size in bytes of the data
1641  *
1642  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1643  *
1644  * child - a pointer to the child sysctl table if this entry is a directory, or
1645  *         %NULL.
1646  *
1647  * proc_handler - the text handler routine (described below)
1648  *
1649  * strategy - the strategy routine (described below)
1650  *
1651  * de - for internal use by the sysctl routines
1652  *
1653  * extra1, extra2 - extra pointers usable by the proc handler routines
1654  *
1655  * Leaf nodes in the sysctl tree will be represented by a single file
1656  * under /proc; non-leaf nodes will be represented by directories.
1657  *
1658  * sysctl(2) can automatically manage read and write requests through
1659  * the sysctl table.  The data and maxlen fields of the ctl_table
1660  * struct enable minimal validation of the values being written to be
1661  * performed, and the mode field allows minimal authentication.
1662  *
1663  * More sophisticated management can be enabled by the provision of a
1664  * strategy routine with the table entry.  This will be called before
1665  * any automatic read or write of the data is performed.
1666  *
1667  * The strategy routine may return
1668  *
1669  * < 0 - Error occurred (error is passed to user process)
1670  *
1671  * 0   - OK - proceed with automatic read or write.
1672  *
1673  * > 0 - OK - read or write has been done by the strategy routine, so
1674  *       return immediately.
1675  *
1676  * There must be a proc_handler routine for any terminal nodes
1677  * mirrored under /proc/sys (non-terminals are handled by a built-in
1678  * directory handler).  Several default handlers are available to
1679  * cover common cases -
1680  *
1681  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1682  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1683  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1684  *
1685  * It is the handler's job to read the input buffer from user memory
1686  * and process it. The handler should return 0 on success.
1687  *
1688  * This routine returns %NULL on a failure to register, and a pointer
1689  * to the table header on success.
1690  */
1691 struct ctl_table_header *__register_sysctl_paths(
1692         struct ctl_table_root *root,
1693         struct nsproxy *namespaces,
1694         const struct ctl_path *path, struct ctl_table *table)
1695 {
1696         struct list_head *header_list;
1697         struct ctl_table_header *header;
1698         struct ctl_table *new, **prevp;
1699         unsigned int n, npath;
1700
1701         /* Count the path components */
1702         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1703                 ;
1704
1705         /*
1706          * For each path component, allocate a 2-element ctl_table array.
1707          * The first array element will be filled with the sysctl entry
1708          * for this, the second will be the sentinel (ctl_name == 0).
1709          *
1710          * We allocate everything in one go so that we don't have to
1711          * worry about freeing additional memory in unregister_sysctl_table.
1712          */
1713         header = kzalloc(sizeof(struct ctl_table_header) +
1714                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1715         if (!header)
1716                 return NULL;
1717
1718         new = (struct ctl_table *) (header + 1);
1719
1720         /* Now connect the dots */
1721         prevp = &header->ctl_table;
1722         for (n = 0; n < npath; ++n, ++path) {
1723                 /* Copy the procname */
1724                 new->procname = path->procname;
1725                 new->ctl_name = path->ctl_name;
1726                 new->mode     = 0555;
1727
1728                 *prevp = new;
1729                 prevp = &new->child;
1730
1731                 new += 2;
1732         }
1733         *prevp = table;
1734         header->ctl_table_arg = table;
1735
1736         INIT_LIST_HEAD(&header->ctl_entry);
1737         header->used = 0;
1738         header->unregistering = NULL;
1739         header->root = root;
1740         sysctl_set_parent(NULL, header->ctl_table);
1741 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1742         if (sysctl_check_table(namespaces, header->ctl_table)) {
1743                 kfree(header);
1744                 return NULL;
1745         }
1746 #endif
1747         spin_lock(&sysctl_lock);
1748         header_list = lookup_header_list(root, namespaces);
1749         list_add_tail(&header->ctl_entry, header_list);
1750         spin_unlock(&sysctl_lock);
1751
1752         return header;
1753 }
1754
1755 /**
1756  * register_sysctl_table_path - register a sysctl table hierarchy
1757  * @path: The path to the directory the sysctl table is in.
1758  * @table: the top-level table structure
1759  *
1760  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1761  * array. A completely 0 filled entry terminates the table.
1762  *
1763  * See __register_sysctl_paths for more details.
1764  */
1765 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1766                                                 struct ctl_table *table)
1767 {
1768         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1769                                         path, table);
1770 }
1771
1772 /**
1773  * register_sysctl_table - register a sysctl table hierarchy
1774  * @table: the top-level table structure
1775  *
1776  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1777  * array. A completely 0 filled entry terminates the table.
1778  *
1779  * See register_sysctl_paths for more details.
1780  */
1781 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1782 {
1783         static const struct ctl_path null_path[] = { {} };
1784
1785         return register_sysctl_paths(null_path, table);
1786 }
1787
1788 /**
1789  * unregister_sysctl_table - unregister a sysctl table hierarchy
1790  * @header: the header returned from register_sysctl_table
1791  *
1792  * Unregisters the sysctl table and all children. proc entries may not
1793  * actually be removed until they are no longer used by anyone.
1794  */
1795 void unregister_sysctl_table(struct ctl_table_header * header)
1796 {
1797         might_sleep();
1798
1799         if (header == NULL)
1800                 return;
1801
1802         spin_lock(&sysctl_lock);
1803         start_unregistering(header);
1804         spin_unlock(&sysctl_lock);
1805         kfree(header);
1806 }
1807
1808 #else /* !CONFIG_SYSCTL */
1809 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1810 {
1811         return NULL;
1812 }
1813
1814 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1815                                                     struct ctl_table *table)
1816 {
1817         return NULL;
1818 }
1819
1820 void unregister_sysctl_table(struct ctl_table_header * table)
1821 {
1822 }
1823
1824 #endif /* CONFIG_SYSCTL */
1825
1826 /*
1827  * /proc/sys support
1828  */
1829
1830 #ifdef CONFIG_PROC_SYSCTL
1831
1832 static int _proc_do_string(void* data, int maxlen, int write,
1833                            struct file *filp, void __user *buffer,
1834                            size_t *lenp, loff_t *ppos)
1835 {
1836         size_t len;
1837         char __user *p;
1838         char c;
1839
1840         if (!data || !maxlen || !*lenp) {
1841                 *lenp = 0;
1842                 return 0;
1843         }
1844
1845         if (write) {
1846                 len = 0;
1847                 p = buffer;
1848                 while (len < *lenp) {
1849                         if (get_user(c, p++))
1850                                 return -EFAULT;
1851                         if (c == 0 || c == '\n')
1852                                 break;
1853                         len++;
1854                 }
1855                 if (len >= maxlen)
1856                         len = maxlen-1;
1857                 if(copy_from_user(data, buffer, len))
1858                         return -EFAULT;
1859                 ((char *) data)[len] = 0;
1860                 *ppos += *lenp;
1861         } else {
1862                 len = strlen(data);
1863                 if (len > maxlen)
1864                         len = maxlen;
1865
1866                 if (*ppos > len) {
1867                         *lenp = 0;
1868                         return 0;
1869                 }
1870
1871                 data += *ppos;
1872                 len  -= *ppos;
1873
1874                 if (len > *lenp)
1875                         len = *lenp;
1876                 if (len)
1877                         if(copy_to_user(buffer, data, len))
1878                                 return -EFAULT;
1879                 if (len < *lenp) {
1880                         if(put_user('\n', ((char __user *) buffer) + len))
1881                                 return -EFAULT;
1882                         len++;
1883                 }
1884                 *lenp = len;
1885                 *ppos += len;
1886         }
1887         return 0;
1888 }
1889
1890 /**
1891  * proc_dostring - read a string sysctl
1892  * @table: the sysctl table
1893  * @write: %TRUE if this is a write to the sysctl file
1894  * @filp: the file structure
1895  * @buffer: the user buffer
1896  * @lenp: the size of the user buffer
1897  * @ppos: file position
1898  *
1899  * Reads/writes a string from/to the user buffer. If the kernel
1900  * buffer provided is not large enough to hold the string, the
1901  * string is truncated. The copied string is %NULL-terminated.
1902  * If the string is being read by the user process, it is copied
1903  * and a newline '\n' is added. It is truncated if the buffer is
1904  * not large enough.
1905  *
1906  * Returns 0 on success.
1907  */
1908 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1909                   void __user *buffer, size_t *lenp, loff_t *ppos)
1910 {
1911         return _proc_do_string(table->data, table->maxlen, write, filp,
1912                                buffer, lenp, ppos);
1913 }
1914
1915
1916 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1917                                  int *valp,
1918                                  int write, void *data)
1919 {
1920         if (write) {
1921                 *valp = *negp ? -*lvalp : *lvalp;
1922         } else {
1923                 int val = *valp;
1924                 if (val < 0) {
1925                         *negp = -1;
1926                         *lvalp = (unsigned long)-val;
1927                 } else {
1928                         *negp = 0;
1929                         *lvalp = (unsigned long)val;
1930                 }
1931         }
1932         return 0;
1933 }
1934
1935 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1936                   int write, struct file *filp, void __user *buffer,
1937                   size_t *lenp, loff_t *ppos,
1938                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1939                               int write, void *data),
1940                   void *data)
1941 {
1942 #define TMPBUFLEN 21
1943         int *i, vleft, first=1, neg, val;
1944         unsigned long lval;
1945         size_t left, len;
1946
1947         char buf[TMPBUFLEN], *p;
1948         char __user *s = buffer;
1949
1950         if (!tbl_data || !table->maxlen || !*lenp ||
1951             (*ppos && !write)) {
1952                 *lenp = 0;
1953                 return 0;
1954         }
1955
1956         i = (int *) tbl_data;
1957         vleft = table->maxlen / sizeof(*i);
1958         left = *lenp;
1959
1960         if (!conv)
1961                 conv = do_proc_dointvec_conv;
1962
1963         for (; left && vleft--; i++, first=0) {
1964                 if (write) {
1965                         while (left) {
1966                                 char c;
1967                                 if (get_user(c, s))
1968                                         return -EFAULT;
1969                                 if (!isspace(c))
1970                                         break;
1971                                 left--;
1972                                 s++;
1973                         }
1974                         if (!left)
1975                                 break;
1976                         neg = 0;
1977                         len = left;
1978                         if (len > sizeof(buf) - 1)
1979                                 len = sizeof(buf) - 1;
1980                         if (copy_from_user(buf, s, len))
1981                                 return -EFAULT;
1982                         buf[len] = 0;
1983                         p = buf;
1984                         if (*p == '-' && left > 1) {
1985                                 neg = 1;
1986                                 p++;
1987                         }
1988                         if (*p < '0' || *p > '9')
1989                                 break;
1990
1991                         lval = simple_strtoul(p, &p, 0);
1992
1993                         len = p-buf;
1994                         if ((len < left) && *p && !isspace(*p))
1995                                 break;
1996                         if (neg)
1997                                 val = -val;
1998                         s += len;
1999                         left -= len;
2000
2001                         if (conv(&neg, &lval, i, 1, data))
2002                                 break;
2003                 } else {
2004                         p = buf;
2005                         if (!first)
2006                                 *p++ = '\t';
2007
2008                         if (conv(&neg, &lval, i, 0, data))
2009                                 break;
2010
2011                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2012                         len = strlen(buf);
2013                         if (len > left)
2014                                 len = left;
2015                         if(copy_to_user(s, buf, len))
2016                                 return -EFAULT;
2017                         left -= len;
2018                         s += len;
2019                 }
2020         }
2021
2022         if (!write && !first && left) {
2023                 if(put_user('\n', s))
2024                         return -EFAULT;
2025                 left--, s++;
2026         }
2027         if (write) {
2028                 while (left) {
2029                         char c;
2030                         if (get_user(c, s++))
2031                                 return -EFAULT;
2032                         if (!isspace(c))
2033                                 break;
2034                         left--;
2035                 }
2036         }
2037         if (write && first)
2038                 return -EINVAL;
2039         *lenp -= left;
2040         *ppos += *lenp;
2041         return 0;
2042 #undef TMPBUFLEN
2043 }
2044
2045 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2046                   void __user *buffer, size_t *lenp, loff_t *ppos,
2047                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2048                               int write, void *data),
2049                   void *data)
2050 {
2051         return __do_proc_dointvec(table->data, table, write, filp,
2052                         buffer, lenp, ppos, conv, data);
2053 }
2054
2055 /**
2056  * proc_dointvec - read a vector of integers
2057  * @table: the sysctl table
2058  * @write: %TRUE if this is a write to the sysctl file
2059  * @filp: the file structure
2060  * @buffer: the user buffer
2061  * @lenp: the size of the user buffer
2062  * @ppos: file position
2063  *
2064  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2065  * values from/to the user buffer, treated as an ASCII string.
2066  *
2067  * Returns 0 on success.
2068  */
2069 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2070                      void __user *buffer, size_t *lenp, loff_t *ppos)
2071 {
2072     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2073                             NULL,NULL);
2074 }
2075
2076 #define OP_SET  0
2077 #define OP_AND  1
2078 #define OP_OR   2
2079
2080 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2081                                       int *valp,
2082                                       int write, void *data)
2083 {
2084         int op = *(int *)data;
2085         if (write) {
2086                 int val = *negp ? -*lvalp : *lvalp;
2087                 switch(op) {
2088                 case OP_SET:    *valp = val; break;
2089                 case OP_AND:    *valp &= val; break;
2090                 case OP_OR:     *valp |= val; break;
2091                 }
2092         } else {
2093                 int val = *valp;
2094                 if (val < 0) {
2095                         *negp = -1;
2096                         *lvalp = (unsigned long)-val;
2097                 } else {
2098                         *negp = 0;
2099                         *lvalp = (unsigned long)val;
2100                 }
2101         }
2102         return 0;
2103 }
2104
2105 /*
2106  *      Taint values can only be increased
2107  */
2108 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2109                                void __user *buffer, size_t *lenp, loff_t *ppos)
2110 {
2111         int op;
2112
2113         if (write && !capable(CAP_SYS_ADMIN))
2114                 return -EPERM;
2115
2116         op = OP_OR;
2117         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2118                                 do_proc_dointvec_bset_conv,&op);
2119 }
2120
2121 struct do_proc_dointvec_minmax_conv_param {
2122         int *min;
2123         int *max;
2124 };
2125
2126 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2127                                         int *valp,
2128                                         int write, void *data)
2129 {
2130         struct do_proc_dointvec_minmax_conv_param *param = data;
2131         if (write) {
2132                 int val = *negp ? -*lvalp : *lvalp;
2133                 if ((param->min && *param->min > val) ||
2134                     (param->max && *param->max < val))
2135                         return -EINVAL;
2136                 *valp = val;
2137         } else {
2138                 int val = *valp;
2139                 if (val < 0) {
2140                         *negp = -1;
2141                         *lvalp = (unsigned long)-val;
2142                 } else {
2143                         *negp = 0;
2144                         *lvalp = (unsigned long)val;
2145                 }
2146         }
2147         return 0;
2148 }
2149
2150 /**
2151  * proc_dointvec_minmax - read a vector of integers with min/max values
2152  * @table: the sysctl table
2153  * @write: %TRUE if this is a write to the sysctl file
2154  * @filp: the file structure
2155  * @buffer: the user buffer
2156  * @lenp: the size of the user buffer
2157  * @ppos: file position
2158  *
2159  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2160  * values from/to the user buffer, treated as an ASCII string.
2161  *
2162  * This routine will ensure the values are within the range specified by
2163  * table->extra1 (min) and table->extra2 (max).
2164  *
2165  * Returns 0 on success.
2166  */
2167 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2168                   void __user *buffer, size_t *lenp, loff_t *ppos)
2169 {
2170         struct do_proc_dointvec_minmax_conv_param param = {
2171                 .min = (int *) table->extra1,
2172                 .max = (int *) table->extra2,
2173         };
2174         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2175                                 do_proc_dointvec_minmax_conv, &param);
2176 }
2177
2178 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2179                                      struct file *filp,
2180                                      void __user *buffer,
2181                                      size_t *lenp, loff_t *ppos,
2182                                      unsigned long convmul,
2183                                      unsigned long convdiv)
2184 {
2185 #define TMPBUFLEN 21
2186         unsigned long *i, *min, *max, val;
2187         int vleft, first=1, neg;
2188         size_t len, left;
2189         char buf[TMPBUFLEN], *p;
2190         char __user *s = buffer;
2191
2192         if (!data || !table->maxlen || !*lenp ||
2193             (*ppos && !write)) {
2194                 *lenp = 0;
2195                 return 0;
2196         }
2197
2198         i = (unsigned long *) data;
2199         min = (unsigned long *) table->extra1;
2200         max = (unsigned long *) table->extra2;
2201         vleft = table->maxlen / sizeof(unsigned long);
2202         left = *lenp;
2203
2204         for (; left && vleft--; i++, min++, max++, first=0) {
2205                 if (write) {
2206                         while (left) {
2207                                 char c;
2208                                 if (get_user(c, s))
2209                                         return -EFAULT;
2210                                 if (!isspace(c))
2211                                         break;
2212                                 left--;
2213                                 s++;
2214                         }
2215                         if (!left)
2216                                 break;
2217                         neg = 0;
2218                         len = left;
2219                         if (len > TMPBUFLEN-1)
2220                                 len = TMPBUFLEN-1;
2221                         if (copy_from_user(buf, s, len))
2222                                 return -EFAULT;
2223                         buf[len] = 0;
2224                         p = buf;
2225                         if (*p == '-' && left > 1) {
2226                                 neg = 1;
2227                                 p++;
2228                         }
2229                         if (*p < '0' || *p > '9')
2230                                 break;
2231                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2232                         len = p-buf;
2233                         if ((len < left) && *p && !isspace(*p))
2234                                 break;
2235                         if (neg)
2236                                 val = -val;
2237                         s += len;
2238                         left -= len;
2239
2240                         if(neg)
2241                                 continue;
2242                         if ((min && val < *min) || (max && val > *max))
2243                                 continue;
2244                         *i = val;
2245                 } else {
2246                         p = buf;
2247                         if (!first)
2248                                 *p++ = '\t';
2249                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2250                         len = strlen(buf);
2251                         if (len > left)
2252                                 len = left;
2253                         if(copy_to_user(s, buf, len))
2254                                 return -EFAULT;
2255                         left -= len;
2256                         s += len;
2257                 }
2258         }
2259
2260         if (!write && !first && left) {
2261                 if(put_user('\n', s))
2262                         return -EFAULT;
2263                 left--, s++;
2264         }
2265         if (write) {
2266                 while (left) {
2267                         char c;
2268                         if (get_user(c, s++))
2269                                 return -EFAULT;
2270                         if (!isspace(c))
2271                                 break;
2272                         left--;
2273                 }
2274         }
2275         if (write && first)
2276                 return -EINVAL;
2277         *lenp -= left;
2278         *ppos += *lenp;
2279         return 0;
2280 #undef TMPBUFLEN
2281 }
2282
2283 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2284                                      struct file *filp,
2285                                      void __user *buffer,
2286                                      size_t *lenp, loff_t *ppos,
2287                                      unsigned long convmul,
2288                                      unsigned long convdiv)
2289 {
2290         return __do_proc_doulongvec_minmax(table->data, table, write,
2291                         filp, buffer, lenp, ppos, convmul, convdiv);
2292 }
2293
2294 /**
2295  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2296  * @table: the sysctl table
2297  * @write: %TRUE if this is a write to the sysctl file
2298  * @filp: the file structure
2299  * @buffer: the user buffer
2300  * @lenp: the size of the user buffer
2301  * @ppos: file position
2302  *
2303  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2304  * values from/to the user buffer, treated as an ASCII string.
2305  *
2306  * This routine will ensure the values are within the range specified by
2307  * table->extra1 (min) and table->extra2 (max).
2308  *
2309  * Returns 0 on success.
2310  */
2311 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2312                            void __user *buffer, size_t *lenp, loff_t *ppos)
2313 {
2314     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2315 }
2316
2317 /**
2318  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2319  * @table: the sysctl table
2320  * @write: %TRUE if this is a write to the sysctl file
2321  * @filp: the file structure
2322  * @buffer: the user buffer
2323  * @lenp: the size of the user buffer
2324  * @ppos: file position
2325  *
2326  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2327  * values from/to the user buffer, treated as an ASCII string. The values
2328  * are treated as milliseconds, and converted to jiffies when they are stored.
2329  *
2330  * This routine will ensure the values are within the range specified by
2331  * table->extra1 (min) and table->extra2 (max).
2332  *
2333  * Returns 0 on success.
2334  */
2335 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2336                                       struct file *filp,
2337                                       void __user *buffer,
2338                                       size_t *lenp, loff_t *ppos)
2339 {
2340     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2341                                      lenp, ppos, HZ, 1000l);
2342 }
2343
2344
2345 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2346                                          int *valp,
2347                                          int write, void *data)
2348 {
2349         if (write) {
2350                 if (*lvalp > LONG_MAX / HZ)
2351                         return 1;
2352                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2353         } else {
2354                 int val = *valp;
2355                 unsigned long lval;
2356                 if (val < 0) {
2357                         *negp = -1;
2358                         lval = (unsigned long)-val;
2359                 } else {
2360                         *negp = 0;
2361                         lval = (unsigned long)val;
2362                 }
2363                 *lvalp = lval / HZ;
2364         }
2365         return 0;
2366 }
2367
2368 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2369                                                 int *valp,
2370                                                 int write, void *data)
2371 {
2372         if (write) {
2373                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2374                         return 1;
2375                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2376         } else {
2377                 int val = *valp;
2378                 unsigned long lval;
2379                 if (val < 0) {
2380                         *negp = -1;
2381                         lval = (unsigned long)-val;
2382                 } else {
2383                         *negp = 0;
2384                         lval = (unsigned long)val;
2385                 }
2386                 *lvalp = jiffies_to_clock_t(lval);
2387         }
2388         return 0;
2389 }
2390
2391 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2392                                             int *valp,
2393                                             int write, void *data)
2394 {
2395         if (write) {
2396                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2397         } else {
2398                 int val = *valp;
2399                 unsigned long lval;
2400                 if (val < 0) {
2401                         *negp = -1;
2402                         lval = (unsigned long)-val;
2403                 } else {
2404                         *negp = 0;
2405                         lval = (unsigned long)val;
2406                 }
2407                 *lvalp = jiffies_to_msecs(lval);
2408         }
2409         return 0;
2410 }
2411
2412 /**
2413  * proc_dointvec_jiffies - read a vector of integers as seconds
2414  * @table: the sysctl table
2415  * @write: %TRUE if this is a write to the sysctl file
2416  * @filp: the file structure
2417  * @buffer: the user buffer
2418  * @lenp: the size of the user buffer
2419  * @ppos: file position
2420  *
2421  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2422  * values from/to the user buffer, treated as an ASCII string.
2423  * The values read are assumed to be in seconds, and are converted into
2424  * jiffies.
2425  *
2426  * Returns 0 on success.
2427  */
2428 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2429                           void __user *buffer, size_t *lenp, loff_t *ppos)
2430 {
2431     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2432                             do_proc_dointvec_jiffies_conv,NULL);
2433 }
2434
2435 /**
2436  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2437  * @table: the sysctl table
2438  * @write: %TRUE if this is a write to the sysctl file
2439  * @filp: the file structure
2440  * @buffer: the user buffer
2441  * @lenp: the size of the user buffer
2442  * @ppos: pointer to the file position
2443  *
2444  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2445  * values from/to the user buffer, treated as an ASCII string.
2446  * The values read are assumed to be in 1/USER_HZ seconds, and
2447  * are converted into jiffies.
2448  *
2449  * Returns 0 on success.
2450  */
2451 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2452                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2453 {
2454     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2455                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2456 }
2457
2458 /**
2459  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2460  * @table: the sysctl table
2461  * @write: %TRUE if this is a write to the sysctl file
2462  * @filp: the file structure
2463  * @buffer: the user buffer
2464  * @lenp: the size of the user buffer
2465  * @ppos: file position
2466  * @ppos: the current position in the file
2467  *
2468  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2469  * values from/to the user buffer, treated as an ASCII string.
2470  * The values read are assumed to be in 1/1000 seconds, and
2471  * are converted into jiffies.
2472  *
2473  * Returns 0 on success.
2474  */
2475 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2476                              void __user *buffer, size_t *lenp, loff_t *ppos)
2477 {
2478         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2479                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2480 }
2481
2482 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2483                            void __user *buffer, size_t *lenp, loff_t *ppos)
2484 {
2485         struct pid *new_pid;
2486         pid_t tmp;
2487         int r;
2488
2489         tmp = pid_vnr(cad_pid);
2490
2491         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2492                                lenp, ppos, NULL, NULL);
2493         if (r || !write)
2494                 return r;
2495
2496         new_pid = find_get_pid(tmp);
2497         if (!new_pid)
2498                 return -ESRCH;
2499
2500         put_pid(xchg(&cad_pid, new_pid));
2501         return 0;
2502 }
2503
2504 #else /* CONFIG_PROC_FS */
2505
2506 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2507                   void __user *buffer, size_t *lenp, loff_t *ppos)
2508 {
2509         return -ENOSYS;
2510 }
2511
2512 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2513                   void __user *buffer, size_t *lenp, loff_t *ppos)
2514 {
2515         return -ENOSYS;
2516 }
2517
2518 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2519                     void __user *buffer, size_t *lenp, loff_t *ppos)
2520 {
2521         return -ENOSYS;
2522 }
2523
2524 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2525                     void __user *buffer, size_t *lenp, loff_t *ppos)
2526 {
2527         return -ENOSYS;
2528 }
2529
2530 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2531                     void __user *buffer, size_t *lenp, loff_t *ppos)
2532 {
2533         return -ENOSYS;
2534 }
2535
2536 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2537                              void __user *buffer, size_t *lenp, loff_t *ppos)
2538 {
2539         return -ENOSYS;
2540 }
2541
2542 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2543                     void __user *buffer, size_t *lenp, loff_t *ppos)
2544 {
2545         return -ENOSYS;
2546 }
2547
2548 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2549                                       struct file *filp,
2550                                       void __user *buffer,
2551                                       size_t *lenp, loff_t *ppos)
2552 {
2553     return -ENOSYS;
2554 }
2555
2556
2557 #endif /* CONFIG_PROC_FS */
2558
2559
2560 #ifdef CONFIG_SYSCTL_SYSCALL
2561 /*
2562  * General sysctl support routines
2563  */
2564
2565 /* The generic sysctl data routine (used if no strategy routine supplied) */
2566 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2567                 void __user *oldval, size_t __user *oldlenp,
2568                 void __user *newval, size_t newlen)
2569 {
2570         size_t len;
2571
2572         /* Get out of I don't have a variable */
2573         if (!table->data || !table->maxlen)
2574                 return -ENOTDIR;
2575
2576         if (oldval && oldlenp) {
2577                 if (get_user(len, oldlenp))
2578                         return -EFAULT;
2579                 if (len) {
2580                         if (len > table->maxlen)
2581                                 len = table->maxlen;
2582                         if (copy_to_user(oldval, table->data, len))
2583                                 return -EFAULT;
2584                         if (put_user(len, oldlenp))
2585                                 return -EFAULT;
2586                 }
2587         }
2588
2589         if (newval && newlen) {
2590                 if (newlen > table->maxlen)
2591                         newlen = table->maxlen;
2592
2593                 if (copy_from_user(table->data, newval, newlen))
2594                         return -EFAULT;
2595         }
2596         return 1;
2597 }
2598
2599 /* The generic string strategy routine: */
2600 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2601                   void __user *oldval, size_t __user *oldlenp,
2602                   void __user *newval, size_t newlen)
2603 {
2604         if (!table->data || !table->maxlen)
2605                 return -ENOTDIR;
2606
2607         if (oldval && oldlenp) {
2608                 size_t bufsize;
2609                 if (get_user(bufsize, oldlenp))
2610                         return -EFAULT;
2611                 if (bufsize) {
2612                         size_t len = strlen(table->data), copied;
2613
2614                         /* This shouldn't trigger for a well-formed sysctl */
2615                         if (len > table->maxlen)
2616                                 len = table->maxlen;
2617
2618                         /* Copy up to a max of bufsize-1 bytes of the string */
2619                         copied = (len >= bufsize) ? bufsize - 1 : len;
2620
2621                         if (copy_to_user(oldval, table->data, copied) ||
2622                             put_user(0, (char __user *)(oldval + copied)))
2623                                 return -EFAULT;
2624                         if (put_user(len, oldlenp))
2625                                 return -EFAULT;
2626                 }
2627         }
2628         if (newval && newlen) {
2629                 size_t len = newlen;
2630                 if (len > table->maxlen)
2631                         len = table->maxlen;
2632                 if(copy_from_user(table->data, newval, len))
2633                         return -EFAULT;
2634                 if (len == table->maxlen)
2635                         len--;
2636                 ((char *) table->data)[len] = 0;
2637         }
2638         return 1;
2639 }
2640
2641 /*
2642  * This function makes sure that all of the integers in the vector
2643  * are between the minimum and maximum values given in the arrays
2644  * table->extra1 and table->extra2, respectively.
2645  */
2646 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2647                 void __user *oldval, size_t __user *oldlenp,
2648                 void __user *newval, size_t newlen)
2649 {
2650
2651         if (newval && newlen) {
2652                 int __user *vec = (int __user *) newval;
2653                 int *min = (int *) table->extra1;
2654                 int *max = (int *) table->extra2;
2655                 size_t length;
2656                 int i;
2657
2658                 if (newlen % sizeof(int) != 0)
2659                         return -EINVAL;
2660
2661                 if (!table->extra1 && !table->extra2)
2662                         return 0;
2663
2664                 if (newlen > table->maxlen)
2665                         newlen = table->maxlen;
2666                 length = newlen / sizeof(int);
2667
2668                 for (i = 0; i < length; i++) {
2669                         int value;
2670                         if (get_user(value, vec + i))
2671                                 return -EFAULT;
2672                         if (min && value < min[i])
2673                                 return -EINVAL;
2674                         if (max && value > max[i])
2675                                 return -EINVAL;
2676                 }
2677         }
2678         return 0;
2679 }
2680
2681 /* Strategy function to convert jiffies to seconds */
2682 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2683                 void __user *oldval, size_t __user *oldlenp,
2684                 void __user *newval, size_t newlen)
2685 {
2686         if (oldval && oldlenp) {
2687                 size_t olen;
2688
2689                 if (get_user(olen, oldlenp))
2690                         return -EFAULT;
2691                 if (olen) {
2692                         int val;
2693
2694                         if (olen < sizeof(int))
2695                                 return -EINVAL;
2696
2697                         val = *(int *)(table->data) / HZ;
2698                         if (put_user(val, (int __user *)oldval))
2699                                 return -EFAULT;
2700                         if (put_user(sizeof(int), oldlenp))
2701                                 return -EFAULT;
2702                 }
2703         }
2704         if (newval && newlen) {
2705                 int new;
2706                 if (newlen != sizeof(int))
2707                         return -EINVAL;
2708                 if (get_user(new, (int __user *)newval))
2709                         return -EFAULT;
2710                 *(int *)(table->data) = new*HZ;
2711         }
2712         return 1;
2713 }
2714
2715 /* Strategy function to convert jiffies to seconds */
2716 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2717                 void __user *oldval, size_t __user *oldlenp,
2718                 void __user *newval, size_t newlen)
2719 {
2720         if (oldval && oldlenp) {
2721                 size_t olen;
2722
2723                 if (get_user(olen, oldlenp))
2724                         return -EFAULT;
2725                 if (olen) {
2726                         int val;
2727
2728                         if (olen < sizeof(int))
2729                                 return -EINVAL;
2730
2731                         val = jiffies_to_msecs(*(int *)(table->data));
2732                         if (put_user(val, (int __user *)oldval))
2733                                 return -EFAULT;
2734                         if (put_user(sizeof(int), oldlenp))
2735                                 return -EFAULT;
2736                 }
2737         }
2738         if (newval && newlen) {
2739                 int new;
2740                 if (newlen != sizeof(int))
2741                         return -EINVAL;
2742                 if (get_user(new, (int __user *)newval))
2743                         return -EFAULT;
2744                 *(int *)(table->data) = msecs_to_jiffies(new);
2745         }
2746         return 1;
2747 }
2748
2749
2750
2751 #else /* CONFIG_SYSCTL_SYSCALL */
2752
2753
2754 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2755 {
2756         struct __sysctl_args tmp;
2757         int error;
2758
2759         if (copy_from_user(&tmp, args, sizeof(tmp)))
2760                 return -EFAULT;
2761
2762         error = deprecated_sysctl_warning(&tmp);
2763
2764         /* If no error reading the parameters then just -ENOSYS ... */
2765         if (!error)
2766                 error = -ENOSYS;
2767
2768         return error;
2769 }
2770
2771 int sysctl_data(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_string(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_intvec(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_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 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2800                 void __user *oldval, size_t __user *oldlenp,
2801                 void __user *newval, size_t newlen)
2802 {
2803         return -ENOSYS;
2804 }
2805
2806 #endif /* CONFIG_SYSCTL_SYSCALL */
2807
2808 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2809 {
2810         static int msg_count;
2811         int name[CTL_MAXNAME];
2812         int i;
2813
2814         /* Check args->nlen. */
2815         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2816                 return -ENOTDIR;
2817
2818         /* Read in the sysctl name for better debug message logging */
2819         for (i = 0; i < args->nlen; i++)
2820                 if (get_user(name[i], args->name + i))
2821                         return -EFAULT;
2822
2823         /* Ignore accesses to kernel.version */
2824         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2825                 return 0;
2826
2827         if (msg_count < 5) {
2828                 msg_count++;
2829                 printk(KERN_INFO
2830                         "warning: process `%s' used the deprecated sysctl "
2831                         "system call with ", current->comm);
2832                 for (i = 0; i < args->nlen; i++)
2833                         printk("%d.", name[i]);
2834                 printk("\n");
2835         }
2836         return 0;
2837 }
2838
2839 /*
2840  * No sense putting this after each symbol definition, twice,
2841  * exception granted :-)
2842  */
2843 EXPORT_SYMBOL(proc_dointvec);
2844 EXPORT_SYMBOL(proc_dointvec_jiffies);
2845 EXPORT_SYMBOL(proc_dointvec_minmax);
2846 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2847 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2848 EXPORT_SYMBOL(proc_dostring);
2849 EXPORT_SYMBOL(proc_doulongvec_minmax);
2850 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2851 EXPORT_SYMBOL(register_sysctl_table);
2852 EXPORT_SYMBOL(register_sysctl_paths);
2853 EXPORT_SYMBOL(sysctl_intvec);
2854 EXPORT_SYMBOL(sysctl_jiffies);
2855 EXPORT_SYMBOL(sysctl_ms_jiffies);
2856 EXPORT_SYMBOL(sysctl_string);
2857 EXPORT_SYMBOL(sysctl_data);
2858 EXPORT_SYMBOL(unregister_sysctl_table);