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