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/times.h>
  42 #include <linux/limits.h>
  43 #include <linux/dcache.h>
  44 #include <linux/syscalls.h>
  45 #include <linux/nfs_fs.h>
  46 #include <linux/acpi.h>
  47 #include <linux/reboot.h>
  48
  49 #include <asm/uaccess.h>
  50 #include <asm/processor.h>
  51
  52 #ifdef CONFIG_X86
  53 #include <asm/nmi.h>
  54 #include <asm/stacktrace.h>
  55 #include <asm/io.h>
  56 #endif
  57
  58 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  59
  60 #if defined(CONFIG_SYSCTL)
  61
  62 /* External variables not in a header file. */
  63 extern int C_A_D;
  64 extern int print_fatal_signals;
  65 extern int sysctl_overcommit_memory;
  66 extern int sysctl_overcommit_ratio;
  67 extern int sysctl_panic_on_oom;
  68 extern int sysctl_oom_kill_allocating_task;
  69 extern int sysctl_oom_dump_tasks;
  70 extern int max_threads;
  71 extern int core_uses_pid;
  72 extern int suid_dumpable;
  73 extern char core_pattern[];
  74 extern int pid_max;
  75 extern int min_free_kbytes;
  76 extern int pid_max_min, pid_max_max;
  77 extern int sysctl_drop_caches;
  78 extern int percpu_pagelist_fraction;
  79 extern int compat_log;
  80 extern int maps_protect;
  81 extern int sysctl_stat_interval;
  82 extern int latencytop_enabled;
  83
  84 /* Constants used for minimum and  maximum */
  85 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
  86 static int one = 1;
  87 #endif
  88
  89 #ifdef CONFIG_DETECT_SOFTLOCKUP
  90 static int sixty = 60;
  91 #endif
  92
  93 #ifdef CONFIG_MMU
  94 static int two = 2;
  95 #endif
  96
  97 static int zero;
  98 static int one_hundred = 100;
  99
 100 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 101 static int maxolduid = 65535;
 102 static int minolduid;
 103 static int min_percpu_pagelist_fract = 8;
 104
 105 static int ngroups_max = NGROUPS_MAX;
 106
 107 #ifdef CONFIG_KMOD
 108 extern char modprobe_path[];
 109 #endif
 110 #ifdef CONFIG_CHR_DEV_SG
 111 extern int sg_big_buff;
 112 #endif
 113
 114 #ifdef __sparc__
 115 extern char reboot_command [];
 116 extern int stop_a_enabled;
 117 extern int scons_pwroff;
 118 #endif
 119
 120 #ifdef __hppa__
 121 extern int pwrsw_enabled;
 122 extern int unaligned_enabled;
 123 #endif
 124
 125 #ifdef CONFIG_S390
 126 #ifdef CONFIG_MATHEMU
 127 extern int sysctl_ieee_emulation_warnings;
 128 #endif
 129 extern int sysctl_userprocess_debug;
 130 extern int spin_retry;
 131 #endif
 132
 133 extern int sysctl_hz_timer;
 134
 135 #ifdef CONFIG_BSD_PROCESS_ACCT
 136 extern int acct_parm[];
 137 #endif
 138
 139 #ifdef CONFIG_IA64
 140 extern int no_unaligned_warning;
 141 #endif
 142
 143 #ifdef CONFIG_RT_MUTEXES
 144 extern int max_lock_depth;
 145 #endif
 146
 147 #ifdef CONFIG_SYSCTL_SYSCALL
 148 static int parse_table(int __user *, int, void __user *, size_t __user *,
 149                 void __user *, size_t, struct ctl_table *);
 150 #endif
 151
 152
 153 #ifdef CONFIG_PROC_SYSCTL
 154 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 155                   void __user *buffer, size_t *lenp, loff_t *ppos);
 156 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 157                                void __user *buffer, size_t *lenp, loff_t *ppos);
 158 #endif
 159
 160 static struct ctl_table root_table[];
 161 static struct ctl_table_root sysctl_table_root;
 162 static struct ctl_table_header root_table_header = {
 163         .ctl_table = root_table,
 164         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 165         .root = &sysctl_table_root,
 166 };
 167 static struct ctl_table_root sysctl_table_root = {
 168         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 169         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 170 };
 171
 172 static struct ctl_table kern_table[];
 173 static struct ctl_table vm_table[];
 174 static struct ctl_table fs_table[];
 175 static struct ctl_table debug_table[];
 176 static struct ctl_table dev_table[];
 177 extern struct ctl_table random_table[];
 178 #ifdef CONFIG_INOTIFY_USER
 179 extern struct ctl_table inotify_table[];
 180 #endif
 181
 182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 183 int sysctl_legacy_va_layout;
 184 #endif
 185
 186 extern int prove_locking;
 187 extern int lock_stat;
 188
 189 /* The default sysctl tables: */
 190
 191 static struct ctl_table root_table[] = {
 192         {
 193                 .ctl_name       = CTL_KERN,
 194                 .procname       = "kernel",
 195                 .mode           = 0555,
 196                 .child          = kern_table,
 197         },
 198         {
 199                 .ctl_name       = CTL_VM,
 200                 .procname       = "vm",
 201                 .mode           = 0555,
 202                 .child          = vm_table,
 203         },
 204         {
 205                 .ctl_name       = CTL_FS,
 206                 .procname       = "fs",
 207                 .mode           = 0555,
 208                 .child          = fs_table,
 209         },
 210         {
 211                 .ctl_name       = CTL_DEBUG,
 212                 .procname       = "debug",
 213                 .mode           = 0555,
 214                 .child          = debug_table,
 215         },
 216         {
 217                 .ctl_name       = CTL_DEV,
 218                 .procname       = "dev",
 219                 .mode           = 0555,
 220                 .child          = dev_table,
 221         },
 222 /*
 223  * NOTE: do not add new entries to this table unless you have read
 224  * Documentation/sysctl/ctl_unnumbered.txt
 225  */
 226         { .ctl_name = 0 }
 227 };
 228
 229 #ifdef CONFIG_SCHED_DEBUG
 230 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 231 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 232 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 233 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 234 #endif
 235
 236 static struct ctl_table kern_table[] = {
 237 #ifdef CONFIG_SCHED_DEBUG
 238         {
 239                 .ctl_name       = CTL_UNNUMBERED,
 240                 .procname       = "sched_min_granularity_ns",
 241                 .data           = &sysctl_sched_min_granularity,
 242                 .maxlen         = sizeof(unsigned int),
 243                 .mode           = 0644,
 244                 .proc_handler   = &sched_nr_latency_handler,
 245                 .strategy       = &sysctl_intvec,
 246                 .extra1         = &min_sched_granularity_ns,
 247                 .extra2         = &max_sched_granularity_ns,
 248         },
 249         {
 250                 .ctl_name       = CTL_UNNUMBERED,
 251                 .procname       = "sched_latency_ns",
 252                 .data           = &sysctl_sched_latency,
 253                 .maxlen         = sizeof(unsigned int),
 254                 .mode           = 0644,
 255                 .proc_handler   = &sched_nr_latency_handler,
 256                 .strategy       = &sysctl_intvec,
 257                 .extra1         = &min_sched_granularity_ns,
 258                 .extra2         = &max_sched_granularity_ns,
 259         },
 260         {
 261                 .ctl_name       = CTL_UNNUMBERED,
 262                 .procname       = "sched_wakeup_granularity_ns",
 263                 .data           = &sysctl_sched_wakeup_granularity,
 264                 .maxlen         = sizeof(unsigned int),
 265                 .mode           = 0644,
 266                 .proc_handler   = &proc_dointvec_minmax,
 267                 .strategy       = &sysctl_intvec,
 268                 .extra1         = &min_wakeup_granularity_ns,
 269                 .extra2         = &max_wakeup_granularity_ns,
 270         },
 271         {
 272                 .ctl_name       = CTL_UNNUMBERED,
 273                 .procname       = "sched_batch_wakeup_granularity_ns",
 274                 .data           = &sysctl_sched_batch_wakeup_granularity,
 275                 .maxlen         = sizeof(unsigned int),
 276                 .mode           = 0644,
 277                 .proc_handler   = &proc_dointvec_minmax,
 278                 .strategy       = &sysctl_intvec,
 279                 .extra1         = &min_wakeup_granularity_ns,
 280                 .extra2         = &max_wakeup_granularity_ns,
 281         },
 282         {
 283                 .ctl_name       = CTL_UNNUMBERED,
 284                 .procname       = "sched_child_runs_first",
 285                 .data           = &sysctl_sched_child_runs_first,
 286                 .maxlen         = sizeof(unsigned int),
 287                 .mode           = 0644,
 288                 .proc_handler   = &proc_dointvec,
 289         },
 290         {
 291                 .ctl_name       = CTL_UNNUMBERED,
 292                 .procname       = "sched_features",
 293                 .data           = &sysctl_sched_features,
 294                 .maxlen         = sizeof(unsigned int),
 295                 .mode           = 0644,
 296                 .proc_handler   = &proc_dointvec,
 297         },
 298         {
 299                 .ctl_name       = CTL_UNNUMBERED,
 300                 .procname       = "sched_migration_cost",
 301                 .data           = &sysctl_sched_migration_cost,
 302                 .maxlen         = sizeof(unsigned int),
 303                 .mode           = 0644,
 304                 .proc_handler   = &proc_dointvec,
 305         },
 306         {
 307                 .ctl_name       = CTL_UNNUMBERED,
 308                 .procname       = "sched_nr_migrate",
 309                 .data           = &sysctl_sched_nr_migrate,
 310                 .maxlen         = sizeof(unsigned int),
 311                 .mode           = 0644,
 312                 .proc_handler   = &proc_dointvec,
 313         },
 314 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
 315         {
 316                 .ctl_name       = CTL_UNNUMBERED,
 317                 .procname       = "sched_min_bal_int_shares",
 318                 .data           = &sysctl_sched_min_bal_int_shares,
 319                 .maxlen         = sizeof(unsigned int),
 320                 .mode           = 0644,
 321                 .proc_handler   = &proc_dointvec,
 322         },
 323         {
 324                 .ctl_name       = CTL_UNNUMBERED,
 325                 .procname       = "sched_max_bal_int_shares",
 326                 .data           = &sysctl_sched_max_bal_int_shares,
 327                 .maxlen         = sizeof(unsigned int),
 328                 .mode           = 0644,
 329                 .proc_handler   = &proc_dointvec,
 330         },
 331 #endif
 332 #endif
 333         {
 334                 .ctl_name       = CTL_UNNUMBERED,
 335                 .procname       = "sched_rt_period_us",
 336                 .data           = &sysctl_sched_rt_period,
 337                 .maxlen         = sizeof(unsigned int),
 338                 .mode           = 0644,
 339                 .proc_handler   = &proc_dointvec,
 340         },
 341         {
 342                 .ctl_name       = CTL_UNNUMBERED,
 343                 .procname       = "sched_rt_runtime_us",
 344                 .data           = &sysctl_sched_rt_runtime,
 345                 .maxlen         = sizeof(int),
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_dointvec,
 348         },
 349         {
 350                 .ctl_name       = CTL_UNNUMBERED,
 351                 .procname       = "sched_compat_yield",
 352                 .data           = &sysctl_sched_compat_yield,
 353                 .maxlen         = sizeof(unsigned int),
 354                 .mode           = 0644,
 355                 .proc_handler   = &proc_dointvec,
 356         },
 357 #ifdef CONFIG_PROVE_LOCKING
 358         {
 359                 .ctl_name       = CTL_UNNUMBERED,
 360                 .procname       = "prove_locking",
 361                 .data           = &prove_locking,
 362                 .maxlen         = sizeof(int),
 363                 .mode           = 0644,
 364                 .proc_handler   = &proc_dointvec,
 365         },
 366 #endif
 367 #ifdef CONFIG_LOCK_STAT
 368         {
 369                 .ctl_name       = CTL_UNNUMBERED,
 370                 .procname       = "lock_stat",
 371                 .data           = &lock_stat,
 372                 .maxlen         = sizeof(int),
 373                 .mode           = 0644,
 374                 .proc_handler   = &proc_dointvec,
 375         },
 376 #endif
 377         {
 378                 .ctl_name       = KERN_PANIC,
 379                 .procname       = "panic",
 380                 .data           = &panic_timeout,
 381                 .maxlen         = sizeof(int),
 382                 .mode           = 0644,
 383                 .proc_handler   = &proc_dointvec,
 384         },
 385         {
 386                 .ctl_name       = KERN_CORE_USES_PID,
 387                 .procname       = "core_uses_pid",
 388                 .data           = &core_uses_pid,
 389                 .maxlen         = sizeof(int),
 390                 .mode           = 0644,
 391                 .proc_handler   = &proc_dointvec,
 392         },
 393         {
 394                 .ctl_name       = KERN_CORE_PATTERN,
 395                 .procname       = "core_pattern",
 396                 .data           = core_pattern,
 397                 .maxlen         = CORENAME_MAX_SIZE,
 398                 .mode           = 0644,
 399                 .proc_handler   = &proc_dostring,
 400                 .strategy       = &sysctl_string,
 401         },
 402 #ifdef CONFIG_PROC_SYSCTL
 403         {
 404                 .procname       = "tainted",
 405                 .data           = &tainted,
 406                 .maxlen         = sizeof(int),
 407                 .mode           = 0644,
 408                 .proc_handler   = &proc_dointvec_taint,
 409         },
 410 #endif
 411 #ifdef CONFIG_LATENCYTOP
 412         {
 413                 .procname       = "latencytop",
 414                 .data           = &latencytop_enabled,
 415                 .maxlen         = sizeof(int),
 416                 .mode           = 0644,
 417                 .proc_handler   = &proc_dointvec,
 418         },
 419 #endif
 420 #ifdef CONFIG_BLK_DEV_INITRD
 421         {
 422                 .ctl_name       = KERN_REALROOTDEV,
 423                 .procname       = "real-root-dev",
 424                 .data           = &real_root_dev,
 425                 .maxlen         = sizeof(int),
 426                 .mode           = 0644,
 427                 .proc_handler   = &proc_dointvec,
 428         },
 429 #endif
 430         {
 431                 .ctl_name       = CTL_UNNUMBERED,
 432                 .procname       = "print-fatal-signals",
 433                 .data           = &print_fatal_signals,
 434                 .maxlen         = sizeof(int),
 435                 .mode           = 0644,
 436                 .proc_handler   = &proc_dointvec,
 437         },
 438 #ifdef __sparc__
 439         {
 440                 .ctl_name       = KERN_SPARC_REBOOT,
 441                 .procname       = "reboot-cmd",
 442                 .data           = reboot_command,
 443                 .maxlen         = 256,
 444                 .mode           = 0644,
 445                 .proc_handler   = &proc_dostring,
 446                 .strategy       = &sysctl_string,
 447         },
 448         {
 449                 .ctl_name       = KERN_SPARC_STOP_A,
 450                 .procname       = "stop-a",
 451                 .data           = &stop_a_enabled,
 452                 .maxlen         = sizeof (int),
 453                 .mode           = 0644,
 454                 .proc_handler   = &proc_dointvec,
 455         },
 456         {
 457                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 458                 .procname       = "scons-poweroff",
 459                 .data           = &scons_pwroff,
 460                 .maxlen         = sizeof (int),
 461                 .mode           = 0644,
 462                 .proc_handler   = &proc_dointvec,
 463         },
 464 #endif
 465 #ifdef __hppa__
 466         {
 467                 .ctl_name       = KERN_HPPA_PWRSW,
 468                 .procname       = "soft-power",
 469                 .data           = &pwrsw_enabled,
 470                 .maxlen         = sizeof (int),
 471                 .mode           = 0644,
 472                 .proc_handler   = &proc_dointvec,
 473         },
 474         {
 475                 .ctl_name       = KERN_HPPA_UNALIGNED,
 476                 .procname       = "unaligned-trap",
 477                 .data           = &unaligned_enabled,
 478                 .maxlen         = sizeof (int),
 479                 .mode           = 0644,
 480                 .proc_handler   = &proc_dointvec,
 481         },
 482 #endif
 483         {
 484                 .ctl_name       = KERN_CTLALTDEL,
 485                 .procname       = "ctrl-alt-del",
 486                 .data           = &C_A_D,
 487                 .maxlen         = sizeof(int),
 488                 .mode           = 0644,
 489                 .proc_handler   = &proc_dointvec,
 490         },
 491 #ifdef CONFIG_KMOD
 492         {
 493                 .ctl_name       = KERN_MODPROBE,
 494                 .procname       = "modprobe",
 495                 .data           = &modprobe_path,
 496                 .maxlen         = KMOD_PATH_LEN,
 497                 .mode           = 0644,
 498                 .proc_handler   = &proc_dostring,
 499                 .strategy       = &sysctl_string,
 500         },
 501 #endif
 502 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 503         {
 504                 .ctl_name       = KERN_HOTPLUG,
 505                 .procname       = "hotplug",
 506                 .data           = &uevent_helper,
 507                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 508                 .mode           = 0644,
 509                 .proc_handler   = &proc_dostring,
 510                 .strategy       = &sysctl_string,
 511         },
 512 #endif
 513 #ifdef CONFIG_CHR_DEV_SG
 514         {
 515                 .ctl_name       = KERN_SG_BIG_BUFF,
 516                 .procname       = "sg-big-buff",
 517                 .data           = &sg_big_buff,
 518                 .maxlen         = sizeof (int),
 519                 .mode           = 0444,
 520                 .proc_handler   = &proc_dointvec,
 521         },
 522 #endif
 523 #ifdef CONFIG_BSD_PROCESS_ACCT
 524         {
 525                 .ctl_name       = KERN_ACCT,
 526                 .procname       = "acct",
 527                 .data           = &acct_parm,
 528                 .maxlen         = 3*sizeof(int),
 529                 .mode           = 0644,
 530                 .proc_handler   = &proc_dointvec,
 531         },
 532 #endif
 533 #ifdef CONFIG_MAGIC_SYSRQ
 534         {
 535                 .ctl_name       = KERN_SYSRQ,
 536                 .procname       = "sysrq",
 537                 .data           = &__sysrq_enabled,
 538                 .maxlen         = sizeof (int),
 539                 .mode           = 0644,
 540                 .proc_handler   = &proc_dointvec,
 541         },
 542 #endif
 543 #ifdef CONFIG_PROC_SYSCTL
 544         {
 545                 .procname       = "cad_pid",
 546                 .data           = NULL,
 547                 .maxlen         = sizeof (int),
 548                 .mode           = 0600,
 549                 .proc_handler   = &proc_do_cad_pid,
 550         },
 551 #endif
 552         {
 553                 .ctl_name       = KERN_MAX_THREADS,
 554                 .procname       = "threads-max",
 555                 .data           = &max_threads,
 556                 .maxlen         = sizeof(int),
 557                 .mode           = 0644,
 558                 .proc_handler   = &proc_dointvec,
 559         },
 560         {
 561                 .ctl_name       = KERN_RANDOM,
 562                 .procname       = "random",
 563                 .mode           = 0555,
 564                 .child          = random_table,
 565         },
 566         {
 567                 .ctl_name       = KERN_OVERFLOWUID,
 568                 .procname       = "overflowuid",
 569                 .data           = &overflowuid,
 570                 .maxlen         = sizeof(int),
 571                 .mode           = 0644,
 572                 .proc_handler   = &proc_dointvec_minmax,
 573                 .strategy       = &sysctl_intvec,
 574                 .extra1         = &minolduid,
 575                 .extra2         = &maxolduid,
 576         },
 577         {
 578                 .ctl_name       = KERN_OVERFLOWGID,
 579                 .procname       = "overflowgid",
 580                 .data           = &overflowgid,
 581                 .maxlen         = sizeof(int),
 582                 .mode           = 0644,
 583                 .proc_handler   = &proc_dointvec_minmax,
 584                 .strategy       = &sysctl_intvec,
 585                 .extra1         = &minolduid,
 586                 .extra2         = &maxolduid,
 587         },
 588 #ifdef CONFIG_S390
 589 #ifdef CONFIG_MATHEMU
 590         {
 591                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 592                 .procname       = "ieee_emulation_warnings",
 593                 .data           = &sysctl_ieee_emulation_warnings,
 594                 .maxlen         = sizeof(int),
 595                 .mode           = 0644,
 596                 .proc_handler   = &proc_dointvec,
 597         },
 598 #endif
 599 #ifdef CONFIG_NO_IDLE_HZ
 600         {
 601                 .ctl_name       = KERN_HZ_TIMER,
 602                 .procname       = "hz_timer",
 603                 .data           = &sysctl_hz_timer,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec,
 607         },
 608 #endif
 609         {
 610                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 611                 .procname       = "userprocess_debug",
 612                 .data           = &sysctl_userprocess_debug,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec,
 616         },
 617 #endif
 618         {
 619                 .ctl_name       = KERN_PIDMAX,
 620                 .procname       = "pid_max",
 621                 .data           = &pid_max,
 622                 .maxlen         = sizeof (int),
 623                 .mode           = 0644,
 624                 .proc_handler   = &proc_dointvec_minmax,
 625                 .strategy       = sysctl_intvec,
 626                 .extra1         = &pid_max_min,
 627                 .extra2         = &pid_max_max,
 628         },
 629         {
 630                 .ctl_name       = KERN_PANIC_ON_OOPS,
 631                 .procname       = "panic_on_oops",
 632                 .data           = &panic_on_oops,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = &proc_dointvec,
 636         },
 637 #if defined CONFIG_PRINTK
 638         {
 639                 .ctl_name       = KERN_PRINTK,
 640                 .procname       = "printk",
 641                 .data           = &console_loglevel,
 642                 .maxlen         = 4*sizeof(int),
 643                 .mode           = 0644,
 644                 .proc_handler   = &proc_dointvec,
 645         },
 646         {
 647                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 648                 .procname       = "printk_ratelimit",
 649                 .data           = &printk_ratelimit_jiffies,
 650                 .maxlen         = sizeof(int),
 651                 .mode           = 0644,
 652                 .proc_handler   = &proc_dointvec_jiffies,
 653                 .strategy       = &sysctl_jiffies,
 654         },
 655         {
 656                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 657                 .procname       = "printk_ratelimit_burst",
 658                 .data           = &printk_ratelimit_burst,
 659                 .maxlen         = sizeof(int),
 660                 .mode           = 0644,
 661                 .proc_handler   = &proc_dointvec,
 662         },
 663 #endif
 664         {
 665                 .ctl_name       = KERN_NGROUPS_MAX,
 666                 .procname       = "ngroups_max",
 667                 .data           = &ngroups_max,
 668                 .maxlen         = sizeof (int),
 669                 .mode           = 0444,
 670                 .proc_handler   = &proc_dointvec,
 671         },
 672 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 673         {
 674                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 675                 .procname       = "unknown_nmi_panic",
 676                 .data           = &unknown_nmi_panic,
 677                 .maxlen         = sizeof (int),
 678                 .mode           = 0644,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681         {
 682                 .procname       = "nmi_watchdog",
 683                 .data           = &nmi_watchdog_enabled,
 684                 .maxlen         = sizeof (int),
 685                 .mode           = 0644,
 686                 .proc_handler   = &proc_nmi_enabled,
 687         },
 688 #endif
 689 #if defined(CONFIG_X86)
 690         {
 691                 .ctl_name       = KERN_PANIC_ON_NMI,
 692                 .procname       = "panic_on_unrecovered_nmi",
 693                 .data           = &panic_on_unrecovered_nmi,
 694                 .maxlen         = sizeof(int),
 695                 .mode           = 0644,
 696                 .proc_handler   = &proc_dointvec,
 697         },
 698         {
 699                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 700                 .procname       = "bootloader_type",
 701                 .data           = &bootloader_type,
 702                 .maxlen         = sizeof (int),
 703                 .mode           = 0444,
 704                 .proc_handler   = &proc_dointvec,
 705         },
 706         {
 707                 .ctl_name       = CTL_UNNUMBERED,
 708                 .procname       = "kstack_depth_to_print",
 709                 .data           = &kstack_depth_to_print,
 710                 .maxlen         = sizeof(int),
 711                 .mode           = 0644,
 712                 .proc_handler   = &proc_dointvec,
 713         },
 714         {
 715                 .ctl_name       = CTL_UNNUMBERED,
 716                 .procname       = "io_delay_type",
 717                 .data           = &io_delay_type,
 718                 .maxlen         = sizeof(int),
 719                 .mode           = 0644,
 720                 .proc_handler   = &proc_dointvec,
 721         },
 722 #endif
 723 #if defined(CONFIG_MMU)
 724         {
 725                 .ctl_name       = KERN_RANDOMIZE,
 726                 .procname       = "randomize_va_space",
 727                 .data           = &randomize_va_space,
 728                 .maxlen         = sizeof(int),
 729                 .mode           = 0644,
 730                 .proc_handler   = &proc_dointvec,
 731         },
 732 #endif
 733 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 734         {
 735                 .ctl_name       = KERN_SPIN_RETRY,
 736                 .procname       = "spin_retry",
 737                 .data           = &spin_retry,
 738                 .maxlen         = sizeof (int),
 739                 .mode           = 0644,
 740                 .proc_handler   = &proc_dointvec,
 741         },
 742 #endif
 743 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 744         {
 745                 .procname       = "acpi_video_flags",
 746                 .data           = &acpi_realmode_flags,
 747                 .maxlen         = sizeof (unsigned long),
 748                 .mode           = 0644,
 749                 .proc_handler   = &proc_doulongvec_minmax,
 750         },
 751 #endif
 752 #ifdef CONFIG_IA64
 753         {
 754                 .ctl_name       = KERN_IA64_UNALIGNED,
 755                 .procname       = "ignore-unaligned-usertrap",
 756                 .data           = &no_unaligned_warning,
 757                 .maxlen         = sizeof (int),
 758                 .mode           = 0644,
 759                 .proc_handler   = &proc_dointvec,
 760         },
 761 #endif
 762 #ifdef CONFIG_DETECT_SOFTLOCKUP
 763         {
 764                 .ctl_name       = CTL_UNNUMBERED,
 765                 .procname       = "softlockup_thresh",
 766                 .data           = &softlockup_thresh,
 767                 .maxlen         = sizeof(unsigned long),
 768                 .mode           = 0644,
 769                 .proc_handler   = &proc_doulongvec_minmax,
 770                 .strategy       = &sysctl_intvec,
 771                 .extra1         = &one,
 772                 .extra2         = &sixty,
 773         },
 774         {
 775                 .ctl_name       = CTL_UNNUMBERED,
 776                 .procname       = "hung_task_check_count",
 777                 .data           = &sysctl_hung_task_check_count,
 778                 .maxlen         = sizeof(unsigned long),
 779                 .mode           = 0644,
 780                 .proc_handler   = &proc_doulongvec_minmax,
 781                 .strategy       = &sysctl_intvec,
 782         },
 783         {
 784                 .ctl_name       = CTL_UNNUMBERED,
 785                 .procname       = "hung_task_timeout_secs",
 786                 .data           = &sysctl_hung_task_timeout_secs,
 787                 .maxlen         = sizeof(unsigned long),
 788                 .mode           = 0644,
 789                 .proc_handler   = &proc_doulongvec_minmax,
 790                 .strategy       = &sysctl_intvec,
 791         },
 792         {
 793                 .ctl_name       = CTL_UNNUMBERED,
 794                 .procname       = "hung_task_warnings",
 795                 .data           = &sysctl_hung_task_warnings,
 796                 .maxlen         = sizeof(unsigned long),
 797                 .mode           = 0644,
 798                 .proc_handler   = &proc_doulongvec_minmax,
 799                 .strategy       = &sysctl_intvec,
 800         },
 801 #endif
 802 #ifdef CONFIG_COMPAT
 803         {
 804                 .ctl_name       = KERN_COMPAT_LOG,
 805                 .procname       = "compat-log",
 806                 .data           = &compat_log,
 807                 .maxlen         = sizeof (int),
 808                 .mode           = 0644,
 809                 .proc_handler   = &proc_dointvec,
 810         },
 811 #endif
 812 #ifdef CONFIG_RT_MUTEXES
 813         {
 814                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 815                 .procname       = "max_lock_depth",
 816                 .data           = &max_lock_depth,
 817                 .maxlen         = sizeof(int),
 818                 .mode           = 0644,
 819                 .proc_handler   = &proc_dointvec,
 820         },
 821 #endif
 822 #ifdef CONFIG_PROC_FS
 823         {
 824                 .ctl_name       = CTL_UNNUMBERED,
 825                 .procname       = "maps_protect",
 826                 .data           = &maps_protect,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = &proc_dointvec,
 830         },
 831 #endif
 832         {
 833                 .ctl_name       = CTL_UNNUMBERED,
 834                 .procname       = "poweroff_cmd",
 835                 .data           = &poweroff_cmd,
 836                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 837                 .mode           = 0644,
 838                 .proc_handler   = &proc_dostring,
 839                 .strategy       = &sysctl_string,
 840         },
 841 /*
 842  * NOTE: do not add new entries to this table unless you have read
 843  * Documentation/sysctl/ctl_unnumbered.txt
 844  */
 845         { .ctl_name = 0 }
 846 };
 847
 848 static struct ctl_table vm_table[] = {
 849         {
 850                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 851                 .procname       = "overcommit_memory",
 852                 .data           = &sysctl_overcommit_memory,
 853                 .maxlen         = sizeof(sysctl_overcommit_memory),
 854                 .mode           = 0644,
 855                 .proc_handler   = &proc_dointvec,
 856         },
 857         {
 858                 .ctl_name       = VM_PANIC_ON_OOM,
 859                 .procname       = "panic_on_oom",
 860                 .data           = &sysctl_panic_on_oom,
 861                 .maxlen         = sizeof(sysctl_panic_on_oom),
 862                 .mode           = 0644,
 863                 .proc_handler   = &proc_dointvec,
 864         },
 865         {
 866                 .ctl_name       = CTL_UNNUMBERED,
 867                 .procname       = "oom_kill_allocating_task",
 868                 .data           = &sysctl_oom_kill_allocating_task,
 869                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 870                 .mode           = 0644,
 871                 .proc_handler   = &proc_dointvec,
 872         },
 873         {
 874                 .ctl_name       = CTL_UNNUMBERED,
 875                 .procname       = "oom_dump_tasks",
 876                 .data           = &sysctl_oom_dump_tasks,
 877                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 878                 .mode           = 0644,
 879                 .proc_handler   = &proc_dointvec,
 880         },
 881         {
 882                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 883                 .procname       = "overcommit_ratio",
 884                 .data           = &sysctl_overcommit_ratio,
 885                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 886                 .mode           = 0644,
 887                 .proc_handler   = &proc_dointvec,
 888         },
 889         {
 890                 .ctl_name       = VM_PAGE_CLUSTER,
 891                 .procname       = "page-cluster",
 892                 .data           = &page_cluster,
 893                 .maxlen         = sizeof(int),
 894                 .mode           = 0644,
 895                 .proc_handler   = &proc_dointvec,
 896         },
 897         {
 898                 .ctl_name       = VM_DIRTY_BACKGROUND,
 899                 .procname       = "dirty_background_ratio",
 900                 .data           = &dirty_background_ratio,
 901                 .maxlen         = sizeof(dirty_background_ratio),
 902                 .mode           = 0644,
 903                 .proc_handler   = &proc_dointvec_minmax,
 904                 .strategy       = &sysctl_intvec,
 905                 .extra1         = &zero,
 906                 .extra2         = &one_hundred,
 907         },
 908         {
 909                 .ctl_name       = VM_DIRTY_RATIO,
 910                 .procname       = "dirty_ratio",
 911                 .data           = &vm_dirty_ratio,
 912                 .maxlen         = sizeof(vm_dirty_ratio),
 913                 .mode           = 0644,
 914                 .proc_handler   = &dirty_ratio_handler,
 915                 .strategy       = &sysctl_intvec,
 916                 .extra1         = &zero,
 917                 .extra2         = &one_hundred,
 918         },
 919         {
 920                 .procname       = "dirty_writeback_centisecs",
 921                 .data           = &dirty_writeback_interval,
 922                 .maxlen         = sizeof(dirty_writeback_interval),
 923                 .mode           = 0644,
 924                 .proc_handler   = &dirty_writeback_centisecs_handler,
 925         },
 926         {
 927                 .procname       = "dirty_expire_centisecs",
 928                 .data           = &dirty_expire_interval,
 929                 .maxlen         = sizeof(dirty_expire_interval),
 930                 .mode           = 0644,
 931                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 932         },
 933         {
 934                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 935                 .procname       = "nr_pdflush_threads",
 936                 .data           = &nr_pdflush_threads,
 937                 .maxlen         = sizeof nr_pdflush_threads,
 938                 .mode           = 0444 /* read-only*/,
 939                 .proc_handler   = &proc_dointvec,
 940         },
 941         {
 942                 .ctl_name       = VM_SWAPPINESS,
 943                 .procname       = "swappiness",
 944                 .data           = &vm_swappiness,
 945                 .maxlen         = sizeof(vm_swappiness),
 946                 .mode           = 0644,
 947                 .proc_handler   = &proc_dointvec_minmax,
 948                 .strategy       = &sysctl_intvec,
 949                 .extra1         = &zero,
 950                 .extra2         = &one_hundred,
 951         },
 952 #ifdef CONFIG_HUGETLB_PAGE
 953          {
 954                 .procname       = "nr_hugepages",
 955                 .data           = &max_huge_pages,
 956                 .maxlen         = sizeof(unsigned long),
 957                 .mode           = 0644,
 958                 .proc_handler   = &hugetlb_sysctl_handler,
 959                 .extra1         = (void *)&hugetlb_zero,
 960                 .extra2         = (void *)&hugetlb_infinity,
 961          },
 962          {
 963                 .ctl_name       = VM_HUGETLB_GROUP,
 964                 .procname       = "hugetlb_shm_group",
 965                 .data           = &sysctl_hugetlb_shm_group,
 966                 .maxlen         = sizeof(gid_t),
 967                 .mode           = 0644,
 968                 .proc_handler   = &proc_dointvec,
 969          },
 970          {
 971                 .ctl_name       = CTL_UNNUMBERED,
 972                 .procname       = "hugepages_treat_as_movable",
 973                 .data           = &hugepages_treat_as_movable,
 974                 .maxlen         = sizeof(int),
 975                 .mode           = 0644,
 976                 .proc_handler   = &hugetlb_treat_movable_handler,
 977         },
 978         {
 979                 .ctl_name       = CTL_UNNUMBERED,
 980                 .procname       = "nr_overcommit_hugepages",
 981                 .data           = &sysctl_overcommit_huge_pages,
 982                 .maxlen         = sizeof(sysctl_overcommit_huge_pages),
 983                 .mode           = 0644,
 984                 .proc_handler   = &hugetlb_overcommit_handler,
 985         },
 986 #endif
 987         {
 988                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 989                 .procname       = "lowmem_reserve_ratio",
 990                 .data           = &sysctl_lowmem_reserve_ratio,
 991                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 992                 .mode           = 0644,
 993                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 994                 .strategy       = &sysctl_intvec,
 995         },
 996         {
 997                 .ctl_name       = VM_DROP_PAGECACHE,
 998                 .procname       = "drop_caches",
 999                 .data           = &sysctl_drop_caches,
1000                 .maxlen         = sizeof(int),
1001                 .mode           = 0644,
1002                 .proc_handler   = drop_caches_sysctl_handler,
1003                 .strategy       = &sysctl_intvec,
1004         },
1005         {
1006                 .ctl_name       = VM_MIN_FREE_KBYTES,
1007                 .procname       = "min_free_kbytes",
1008                 .data           = &min_free_kbytes,
1009                 .maxlen         = sizeof(min_free_kbytes),
1010                 .mode           = 0644,
1011                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1012                 .strategy       = &sysctl_intvec,
1013                 .extra1         = &zero,
1014         },
1015         {
1016                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1017                 .procname       = "percpu_pagelist_fraction",
1018                 .data           = &percpu_pagelist_fraction,
1019                 .maxlen         = sizeof(percpu_pagelist_fraction),
1020                 .mode           = 0644,
1021                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1022                 .strategy       = &sysctl_intvec,
1023                 .extra1         = &min_percpu_pagelist_fract,
1024         },
1025 #ifdef CONFIG_MMU
1026         {
1027                 .ctl_name       = VM_MAX_MAP_COUNT,
1028                 .procname       = "max_map_count",
1029                 .data           = &sysctl_max_map_count,
1030                 .maxlen         = sizeof(sysctl_max_map_count),
1031                 .mode           = 0644,
1032                 .proc_handler   = &proc_dointvec
1033         },
1034 #endif
1035         {
1036                 .ctl_name       = VM_LAPTOP_MODE,
1037                 .procname       = "laptop_mode",
1038                 .data           = &laptop_mode,
1039                 .maxlen         = sizeof(laptop_mode),
1040                 .mode           = 0644,
1041                 .proc_handler   = &proc_dointvec_jiffies,
1042                 .strategy       = &sysctl_jiffies,
1043         },
1044         {
1045                 .ctl_name       = VM_BLOCK_DUMP,
1046                 .procname       = "block_dump",
1047                 .data           = &block_dump,
1048                 .maxlen         = sizeof(block_dump),
1049                 .mode           = 0644,
1050                 .proc_handler   = &proc_dointvec,
1051                 .strategy       = &sysctl_intvec,
1052                 .extra1         = &zero,
1053         },
1054         {
1055                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1056                 .procname       = "vfs_cache_pressure",
1057                 .data           = &sysctl_vfs_cache_pressure,
1058                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1059                 .mode           = 0644,
1060                 .proc_handler   = &proc_dointvec,
1061                 .strategy       = &sysctl_intvec,
1062                 .extra1         = &zero,
1063         },
1064 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1065         {
1066                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1067                 .procname       = "legacy_va_layout",
1068                 .data           = &sysctl_legacy_va_layout,
1069                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1070                 .mode           = 0644,
1071                 .proc_handler   = &proc_dointvec,
1072                 .strategy       = &sysctl_intvec,
1073                 .extra1         = &zero,
1074         },
1075 #endif
1076 #ifdef CONFIG_NUMA
1077         {
1078                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1079                 .procname       = "zone_reclaim_mode",
1080                 .data           = &zone_reclaim_mode,
1081                 .maxlen         = sizeof(zone_reclaim_mode),
1082                 .mode           = 0644,
1083                 .proc_handler   = &proc_dointvec,
1084                 .strategy       = &sysctl_intvec,
1085                 .extra1         = &zero,
1086         },
1087         {
1088                 .ctl_name       = VM_MIN_UNMAPPED,
1089                 .procname       = "min_unmapped_ratio",
1090                 .data           = &sysctl_min_unmapped_ratio,
1091                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1092                 .mode           = 0644,
1093                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1094                 .strategy       = &sysctl_intvec,
1095                 .extra1         = &zero,
1096                 .extra2         = &one_hundred,
1097         },
1098         {
1099                 .ctl_name       = VM_MIN_SLAB,
1100                 .procname       = "min_slab_ratio",
1101                 .data           = &sysctl_min_slab_ratio,
1102                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1103                 .mode           = 0644,
1104                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1105                 .strategy       = &sysctl_intvec,
1106                 .extra1         = &zero,
1107                 .extra2         = &one_hundred,
1108         },
1109 #endif
1110 #ifdef CONFIG_SMP
1111         {
1112                 .ctl_name       = CTL_UNNUMBERED,
1113                 .procname       = "stat_interval",
1114                 .data           = &sysctl_stat_interval,
1115                 .maxlen         = sizeof(sysctl_stat_interval),
1116                 .mode           = 0644,
1117                 .proc_handler   = &proc_dointvec_jiffies,
1118                 .strategy       = &sysctl_jiffies,
1119         },
1120 #endif
1121 #ifdef CONFIG_SECURITY
1122         {
1123                 .ctl_name       = CTL_UNNUMBERED,
1124                 .procname       = "mmap_min_addr",
1125                 .data           = &mmap_min_addr,
1126                 .maxlen         = sizeof(unsigned long),
1127                 .mode           = 0644,
1128                 .proc_handler   = &proc_doulongvec_minmax,
1129         },
1130 #endif
1131 #ifdef CONFIG_NUMA
1132         {
1133                 .ctl_name       = CTL_UNNUMBERED,
1134                 .procname       = "numa_zonelist_order",
1135                 .data           = &numa_zonelist_order,
1136                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1137                 .mode           = 0644,
1138                 .proc_handler   = &numa_zonelist_order_handler,
1139                 .strategy       = &sysctl_string,
1140         },
1141 #endif
1142 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1143    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1144         {
1145                 .ctl_name       = VM_VDSO_ENABLED,
1146                 .procname       = "vdso_enabled",
1147                 .data           = &vdso_enabled,
1148                 .maxlen         = sizeof(vdso_enabled),
1149                 .mode           = 0644,
1150                 .proc_handler   = &proc_dointvec,
1151                 .strategy       = &sysctl_intvec,
1152                 .extra1         = &zero,
1153         },
1154 #endif
1155 #ifdef CONFIG_HIGHMEM
1156         {
1157                 .ctl_name       = CTL_UNNUMBERED,
1158                 .procname       = "highmem_is_dirtyable",
1159                 .data           = &vm_highmem_is_dirtyable,
1160                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1161                 .mode           = 0644,
1162                 .proc_handler   = &proc_dointvec_minmax,
1163                 .strategy       = &sysctl_intvec,
1164                 .extra1         = &zero,
1165                 .extra2         = &one,
1166         },
1167 #endif
1168 /*
1169  * NOTE: do not add new entries to this table unless you have read
1170  * Documentation/sysctl/ctl_unnumbered.txt
1171  */
1172         { .ctl_name = 0 }
1173 };
1174
1175 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1176 static struct ctl_table binfmt_misc_table[] = {
1177         { .ctl_name = 0 }
1178 };
1179 #endif
1180
1181 static struct ctl_table fs_table[] = {
1182         {
1183                 .ctl_name       = FS_NRINODE,
1184                 .procname       = "inode-nr",
1185                 .data           = &inodes_stat,
1186                 .maxlen         = 2*sizeof(int),
1187                 .mode           = 0444,
1188                 .proc_handler   = &proc_dointvec,
1189         },
1190         {
1191                 .ctl_name       = FS_STATINODE,
1192                 .procname       = "inode-state",
1193                 .data           = &inodes_stat,
1194                 .maxlen         = 7*sizeof(int),
1195                 .mode           = 0444,
1196                 .proc_handler   = &proc_dointvec,
1197         },
1198         {
1199                 .procname       = "file-nr",
1200                 .data           = &files_stat,
1201                 .maxlen         = 3*sizeof(int),
1202                 .mode           = 0444,
1203                 .proc_handler   = &proc_nr_files,
1204         },
1205         {
1206                 .ctl_name       = FS_MAXFILE,
1207                 .procname       = "file-max",
1208                 .data           = &files_stat.max_files,
1209                 .maxlen         = sizeof(int),
1210                 .mode           = 0644,
1211                 .proc_handler   = &proc_dointvec,
1212         },
1213         {
1214                 .ctl_name       = CTL_UNNUMBERED,
1215                 .procname       = "nr_open",
1216                 .data           = &sysctl_nr_open,
1217                 .maxlen         = sizeof(int),
1218                 .mode           = 0644,
1219                 .proc_handler   = &proc_dointvec,
1220         },
1221         {
1222                 .ctl_name       = FS_DENTRY,
1223                 .procname       = "dentry-state",
1224                 .data           = &dentry_stat,
1225                 .maxlen         = 6*sizeof(int),
1226                 .mode           = 0444,
1227                 .proc_handler   = &proc_dointvec,
1228         },
1229         {
1230                 .ctl_name       = FS_OVERFLOWUID,
1231                 .procname       = "overflowuid",
1232                 .data           = &fs_overflowuid,
1233                 .maxlen         = sizeof(int),
1234                 .mode           = 0644,
1235                 .proc_handler   = &proc_dointvec_minmax,
1236                 .strategy       = &sysctl_intvec,
1237                 .extra1         = &minolduid,
1238                 .extra2         = &maxolduid,
1239         },
1240         {
1241                 .ctl_name       = FS_OVERFLOWGID,
1242                 .procname       = "overflowgid",
1243                 .data           = &fs_overflowgid,
1244                 .maxlen         = sizeof(int),
1245                 .mode           = 0644,
1246                 .proc_handler   = &proc_dointvec_minmax,
1247                 .strategy       = &sysctl_intvec,
1248                 .extra1         = &minolduid,
1249                 .extra2         = &maxolduid,
1250         },
1251         {
1252                 .ctl_name       = FS_LEASES,
1253                 .procname       = "leases-enable",
1254                 .data           = &leases_enable,
1255                 .maxlen         = sizeof(int),
1256                 .mode           = 0644,
1257                 .proc_handler   = &proc_dointvec,
1258         },
1259 #ifdef CONFIG_DNOTIFY
1260         {
1261                 .ctl_name       = FS_DIR_NOTIFY,
1262                 .procname       = "dir-notify-enable",
1263                 .data           = &dir_notify_enable,
1264                 .maxlen         = sizeof(int),
1265                 .mode           = 0644,
1266                 .proc_handler   = &proc_dointvec,
1267         },
1268 #endif
1269 #ifdef CONFIG_MMU
1270         {
1271                 .ctl_name       = FS_LEASE_TIME,
1272                 .procname       = "lease-break-time",
1273                 .data           = &lease_break_time,
1274                 .maxlen         = sizeof(int),
1275                 .mode           = 0644,
1276                 .proc_handler   = &proc_dointvec_minmax,
1277                 .strategy       = &sysctl_intvec,
1278                 .extra1         = &zero,
1279                 .extra2         = &two,
1280         },
1281         {
1282                 .procname       = "aio-nr",
1283                 .data           = &aio_nr,
1284                 .maxlen         = sizeof(aio_nr),
1285                 .mode           = 0444,
1286                 .proc_handler   = &proc_doulongvec_minmax,
1287         },
1288         {
1289                 .procname       = "aio-max-nr",
1290                 .data           = &aio_max_nr,
1291                 .maxlen         = sizeof(aio_max_nr),
1292                 .mode           = 0644,
1293                 .proc_handler   = &proc_doulongvec_minmax,
1294         },
1295 #ifdef CONFIG_INOTIFY_USER
1296         {
1297                 .ctl_name       = FS_INOTIFY,
1298                 .procname       = "inotify",
1299                 .mode           = 0555,
1300                 .child          = inotify_table,
1301         },
1302 #endif
1303 #endif
1304         {
1305                 .ctl_name       = KERN_SETUID_DUMPABLE,
1306                 .procname       = "suid_dumpable",
1307                 .data           = &suid_dumpable,
1308                 .maxlen         = sizeof(int),
1309                 .mode           = 0644,
1310                 .proc_handler   = &proc_dointvec,
1311         },
1312 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1313         {
1314                 .ctl_name       = CTL_UNNUMBERED,
1315                 .procname       = "binfmt_misc",
1316                 .mode           = 0555,
1317                 .child          = binfmt_misc_table,
1318         },
1319 #endif
1320 /*
1321  * NOTE: do not add new entries to this table unless you have read
1322  * Documentation/sysctl/ctl_unnumbered.txt
1323  */
1324         { .ctl_name = 0 }
1325 };
1326
1327 static struct ctl_table debug_table[] = {
1328 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1329         {
1330                 .ctl_name       = CTL_UNNUMBERED,
1331                 .procname       = "exception-trace",
1332                 .data           = &show_unhandled_signals,
1333                 .maxlen         = sizeof(int),
1334                 .mode           = 0644,
1335                 .proc_handler   = proc_dointvec
1336         },
1337 #endif
1338         { .ctl_name = 0 }
1339 };
1340
1341 static struct ctl_table dev_table[] = {
1342         { .ctl_name = 0 }
1343 };
1344
1345 static DEFINE_SPINLOCK(sysctl_lock);
1346
1347 /* called under sysctl_lock */
1348 static int use_table(struct ctl_table_header *p)
1349 {
1350         if (unlikely(p->unregistering))
1351                 return 0;
1352         p->used++;
1353         return 1;
1354 }
1355
1356 /* called under sysctl_lock */
1357 static void unuse_table(struct ctl_table_header *p)
1358 {
1359         if (!--p->used)
1360                 if (unlikely(p->unregistering))
1361                         complete(p->unregistering);
1362 }
1363
1364 /* called under sysctl_lock, will reacquire if has to wait */
1365 static void start_unregistering(struct ctl_table_header *p)
1366 {
1367         /*
1368          * if p->used is 0, nobody will ever touch that entry again;
1369          * we'll eliminate all paths to it before dropping sysctl_lock
1370          */
1371         if (unlikely(p->used)) {
1372                 struct completion wait;
1373                 init_completion(&wait);
1374                 p->unregistering = &wait;
1375                 spin_unlock(&sysctl_lock);
1376                 wait_for_completion(&wait);
1377                 spin_lock(&sysctl_lock);
1378         }
1379         /*
1380          * do not remove from the list until nobody holds it; walking the
1381          * list in do_sysctl() relies on that.
1382          */
1383         list_del_init(&p->ctl_entry);
1384 }
1385
1386 void sysctl_head_finish(struct ctl_table_header *head)
1387 {
1388         if (!head)
1389                 return;
1390         spin_lock(&sysctl_lock);
1391         unuse_table(head);
1392         spin_unlock(&sysctl_lock);
1393 }
1394
1395 static struct list_head *
1396 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1397 {
1398         struct list_head *header_list;
1399         header_list = &root->header_list;
1400         if (root->lookup)
1401                 header_list = root->lookup(root, namespaces);
1402         return header_list;
1403 }
1404
1405 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1406                                             struct ctl_table_header *prev)
1407 {
1408         struct ctl_table_root *root;
1409         struct list_head *header_list;
1410         struct ctl_table_header *head;
1411         struct list_head *tmp;
1412
1413         spin_lock(&sysctl_lock);
1414         if (prev) {
1415                 head = prev;
1416                 tmp = &prev->ctl_entry;
1417                 unuse_table(prev);
1418                 goto next;
1419         }
1420         tmp = &root_table_header.ctl_entry;
1421         for (;;) {
1422                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1423
1424                 if (!use_table(head))
1425                         goto next;
1426                 spin_unlock(&sysctl_lock);
1427                 return head;
1428         next:
1429                 root = head->root;
1430                 tmp = tmp->next;
1431                 header_list = lookup_header_list(root, namespaces);
1432                 if (tmp != header_list)
1433                         continue;
1434
1435                 do {
1436                         root = list_entry(root->root_list.next,
1437                                         struct ctl_table_root, root_list);
1438                         if (root == &sysctl_table_root)
1439                                 goto out;
1440                         header_list = lookup_header_list(root, namespaces);
1441                 } while (list_empty(header_list));
1442                 tmp = header_list->next;
1443         }
1444 out:
1445         spin_unlock(&sysctl_lock);
1446         return NULL;
1447 }
1448
1449 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1450 {
1451         return __sysctl_head_next(current->nsproxy, prev);
1452 }
1453
1454 void register_sysctl_root(struct ctl_table_root *root)
1455 {
1456         spin_lock(&sysctl_lock);
1457         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1458         spin_unlock(&sysctl_lock);
1459 }
1460
1461 #ifdef CONFIG_SYSCTL_SYSCALL
1462 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1463                void __user *newval, size_t newlen)
1464 {
1465         struct ctl_table_header *head;
1466         int error = -ENOTDIR;
1467
1468         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1469                 return -ENOTDIR;
1470         if (oldval) {
1471                 int old_len;
1472                 if (!oldlenp || get_user(old_len, oldlenp))
1473                         return -EFAULT;
1474         }
1475
1476         for (head = sysctl_head_next(NULL); head;
1477                         head = sysctl_head_next(head)) {
1478                 error = parse_table(name, nlen, oldval, oldlenp,
1479                                         newval, newlen, head->ctl_table);
1480                 if (error != -ENOTDIR) {
1481                         sysctl_head_finish(head);
1482                         break;
1483                 }
1484         }
1485         return error;
1486 }
1487
1488 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1489 {
1490         struct __sysctl_args tmp;
1491         int error;
1492
1493         if (copy_from_user(&tmp, args, sizeof(tmp)))
1494                 return -EFAULT;
1495
1496         error = deprecated_sysctl_warning(&tmp);
1497         if (error)
1498                 goto out;
1499
1500         lock_kernel();
1501         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1502                           tmp.newval, tmp.newlen);
1503         unlock_kernel();
1504 out:
1505         return error;
1506 }
1507 #endif /* CONFIG_SYSCTL_SYSCALL */
1508
1509 /*
1510  * sysctl_perm does NOT grant the superuser all rights automatically, because
1511  * some sysctl variables are readonly even to root.
1512  */
1513
1514 static int test_perm(int mode, int op)
1515 {
1516         if (!current->euid)
1517                 mode >>= 6;
1518         else if (in_egroup_p(0))
1519                 mode >>= 3;
1520         if ((mode & op & 0007) == op)
1521                 return 0;
1522         return -EACCES;
1523 }
1524
1525 int sysctl_perm(struct ctl_table *table, int op)
1526 {
1527         int error;
1528         error = security_sysctl(table, op);
1529         if (error)
1530                 return error;
1531         return test_perm(table->mode, op);
1532 }
1533
1534 #ifdef CONFIG_SYSCTL_SYSCALL
1535 static int parse_table(int __user *name, int nlen,
1536                        void __user *oldval, size_t __user *oldlenp,
1537                        void __user *newval, size_t newlen,
1538                        struct ctl_table *table)
1539 {
1540         int n;
1541 repeat:
1542         if (!nlen)
1543                 return -ENOTDIR;
1544         if (get_user(n, name))
1545                 return -EFAULT;
1546         for ( ; table->ctl_name || table->procname; table++) {
1547                 if (!table->ctl_name)
1548                         continue;
1549                 if (n == table->ctl_name) {
1550                         int error;
1551                         if (table->child) {
1552                                 if (sysctl_perm(table, 001))
1553                                         return -EPERM;
1554                                 name++;
1555                                 nlen--;
1556                                 table = table->child;
1557                                 goto repeat;
1558                         }
1559                         error = do_sysctl_strategy(table, name, nlen,
1560                                                    oldval, oldlenp,
1561                                                    newval, newlen);
1562                         return error;
1563                 }
1564         }
1565         return -ENOTDIR;
1566 }
1567
1568 /* Perform the actual read/write of a sysctl table entry. */
1569 int do_sysctl_strategy (struct ctl_table *table,
1570                         int __user *name, int nlen,
1571                         void __user *oldval, size_t __user *oldlenp,
1572                         void __user *newval, size_t newlen)
1573 {
1574         int op = 0, rc;
1575
1576         if (oldval)
1577                 op |= 004;
1578         if (newval)
1579                 op |= 002;
1580         if (sysctl_perm(table, op))
1581                 return -EPERM;
1582
1583         if (table->strategy) {
1584                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1585                                      newval, newlen);
1586                 if (rc < 0)
1587                         return rc;
1588                 if (rc > 0)
1589                         return 0;
1590         }
1591
1592         /* If there is no strategy routine, or if the strategy returns
1593          * zero, proceed with automatic r/w */
1594         if (table->data && table->maxlen) {
1595                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1596                                  newval, newlen);
1597                 if (rc < 0)
1598                         return rc;
1599         }
1600         return 0;
1601 }
1602 #endif /* CONFIG_SYSCTL_SYSCALL */
1603
1604 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1605 {
1606         for (; table->ctl_name || table->procname; table++) {
1607                 table->parent = parent;
1608                 if (table->child)
1609                         sysctl_set_parent(table, table->child);
1610         }
1611 }
1612
1613 static __init int sysctl_init(void)
1614 {
1615         int err;
1616         sysctl_set_parent(NULL, root_table);
1617         err = sysctl_check_table(current->nsproxy, root_table);
1618         return 0;
1619 }
1620
1621 core_initcall(sysctl_init);
1622
1623 /**
1624  * __register_sysctl_paths - register a sysctl hierarchy
1625  * @root: List of sysctl headers to register on
1626  * @namespaces: Data to compute which lists of sysctl entries are visible
1627  * @path: The path to the directory the sysctl table is in.
1628  * @table: the top-level table structure
1629  *
1630  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1631  * array. A completely 0 filled entry terminates the table.
1632  *
1633  * The members of the &struct ctl_table structure are used as follows:
1634  *
1635  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1636  *            must be unique within that level of sysctl
1637  *
1638  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1639  *            enter a sysctl file
1640  *
1641  * data - a pointer to data for use by proc_handler
1642  *
1643  * maxlen - the maximum size in bytes of the data
1644  *
1645  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1646  *
1647  * child - a pointer to the child sysctl table if this entry is a directory, or
1648  *         %NULL.
1649  *
1650  * proc_handler - the text handler routine (described below)
1651  *
1652  * strategy - the strategy routine (described below)
1653  *
1654  * de - for internal use by the sysctl routines
1655  *
1656  * extra1, extra2 - extra pointers usable by the proc handler routines
1657  *
1658  * Leaf nodes in the sysctl tree will be represented by a single file
1659  * under /proc; non-leaf nodes will be represented by directories.
1660  *
1661  * sysctl(2) can automatically manage read and write requests through
1662  * the sysctl table.  The data and maxlen fields of the ctl_table
1663  * struct enable minimal validation of the values being written to be
1664  * performed, and the mode field allows minimal authentication.
1665  *
1666  * More sophisticated management can be enabled by the provision of a
1667  * strategy routine with the table entry.  This will be called before
1668  * any automatic read or write of the data is performed.
1669  *
1670  * The strategy routine may return
1671  *
1672  * < 0 - Error occurred (error is passed to user process)
1673  *
1674  * 0   - OK - proceed with automatic read or write.
1675  *
1676  * > 0 - OK - read or write has been done by the strategy routine, so
1677  *       return immediately.
1678  *
1679  * There must be a proc_handler routine for any terminal nodes
1680  * mirrored under /proc/sys (non-terminals are handled by a built-in
1681  * directory handler).  Several default handlers are available to
1682  * cover common cases -
1683  *
1684  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1685  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1686  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1687  *
1688  * It is the handler's job to read the input buffer from user memory
1689  * and process it. The handler should return 0 on success.
1690  *
1691  * This routine returns %NULL on a failure to register, and a pointer
1692  * to the table header on success.
1693  */
1694 struct ctl_table_header *__register_sysctl_paths(
1695         struct ctl_table_root *root,
1696         struct nsproxy *namespaces,
1697         const struct ctl_path *path, struct ctl_table *table)
1698 {
1699         struct list_head *header_list;
1700         struct ctl_table_header *header;
1701         struct ctl_table *new, **prevp;
1702         unsigned int n, npath;
1703
1704         /* Count the path components */
1705         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1706                 ;
1707
1708         /*
1709          * For each path component, allocate a 2-element ctl_table array.
1710          * The first array element will be filled with the sysctl entry
1711          * for this, the second will be the sentinel (ctl_name == 0).
1712          *
1713          * We allocate everything in one go so that we don't have to
1714          * worry about freeing additional memory in unregister_sysctl_table.
1715          */
1716         header = kzalloc(sizeof(struct ctl_table_header) +
1717                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1718         if (!header)
1719                 return NULL;
1720
1721         new = (struct ctl_table *) (header + 1);
1722
1723         /* Now connect the dots */
1724         prevp = &header->ctl_table;
1725         for (n = 0; n < npath; ++n, ++path) {
1726                 /* Copy the procname */
1727                 new->procname = path->procname;
1728                 new->ctl_name = path->ctl_name;
1729                 new->mode     = 0555;
1730
1731                 *prevp = new;
1732                 prevp = &new->child;
1733
1734                 new += 2;
1735         }
1736         *prevp = table;
1737         header->ctl_table_arg = table;
1738
1739         INIT_LIST_HEAD(&header->ctl_entry);
1740         header->used = 0;
1741         header->unregistering = NULL;
1742         header->root = root;
1743         sysctl_set_parent(NULL, header->ctl_table);
1744         if (sysctl_check_table(namespaces, header->ctl_table)) {
1745                 kfree(header);
1746                 return NULL;
1747         }
1748         spin_lock(&sysctl_lock);
1749         header_list = lookup_header_list(root, namespaces);
1750         list_add_tail(&header->ctl_entry, header_list);
1751         spin_unlock(&sysctl_lock);
1752
1753         return header;
1754 }
1755
1756 /**
1757  * register_sysctl_table_path - register a sysctl table hierarchy
1758  * @path: The path to the directory the sysctl table is in.
1759  * @table: the top-level table structure
1760  *
1761  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1762  * array. A completely 0 filled entry terminates the table.
1763  *
1764  * See __register_sysctl_paths for more details.
1765  */
1766 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1767                                                 struct ctl_table *table)
1768 {
1769         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1770                                         path, table);
1771 }
1772
1773 /**
1774  * register_sysctl_table - register a sysctl table hierarchy
1775  * @table: the top-level table structure
1776  *
1777  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1778  * array. A completely 0 filled entry terminates the table.
1779  *
1780  * See register_sysctl_paths for more details.
1781  */
1782 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1783 {
1784         static const struct ctl_path null_path[] = { {} };
1785
1786         return register_sysctl_paths(null_path, table);
1787 }
1788
1789 /**
1790  * unregister_sysctl_table - unregister a sysctl table hierarchy
1791  * @header: the header returned from register_sysctl_table
1792  *
1793  * Unregisters the sysctl table and all children. proc entries may not
1794  * actually be removed until they are no longer used by anyone.
1795  */
1796 void unregister_sysctl_table(struct ctl_table_header * header)
1797 {
1798         might_sleep();
1799
1800         if (header == NULL)
1801                 return;
1802
1803         spin_lock(&sysctl_lock);
1804         start_unregistering(header);
1805         spin_unlock(&sysctl_lock);
1806         kfree(header);
1807 }
1808
1809 #else /* !CONFIG_SYSCTL */
1810 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1811 {
1812         return NULL;
1813 }
1814
1815 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1816                                                     struct ctl_table *table)
1817 {
1818         return NULL;
1819 }
1820
1821 void unregister_sysctl_table(struct ctl_table_header * table)
1822 {
1823 }
1824
1825 #endif /* CONFIG_SYSCTL */
1826
1827 /*
1828  * /proc/sys support
1829  */
1830
1831 #ifdef CONFIG_PROC_SYSCTL
1832
1833 static int _proc_do_string(void* data, int maxlen, int write,
1834                            struct file *filp, void __user *buffer,
1835                            size_t *lenp, loff_t *ppos)
1836 {
1837         size_t len;
1838         char __user *p;
1839         char c;
1840
1841         if (!data || !maxlen || !*lenp) {
1842                 *lenp = 0;
1843                 return 0;
1844         }
1845
1846         if (write) {
1847                 len = 0;
1848                 p = buffer;
1849                 while (len < *lenp) {
1850                         if (get_user(c, p++))
1851                                 return -EFAULT;
1852                         if (c == 0 || c == '\n')
1853                                 break;
1854                         len++;
1855                 }
1856                 if (len >= maxlen)
1857                         len = maxlen-1;
1858                 if(copy_from_user(data, buffer, len))
1859                         return -EFAULT;
1860                 ((char *) data)[len] = 0;
1861                 *ppos += *lenp;
1862         } else {
1863                 len = strlen(data);
1864                 if (len > maxlen)
1865                         len = maxlen;
1866
1867                 if (*ppos > len) {
1868                         *lenp = 0;
1869                         return 0;
1870                 }
1871
1872                 data += *ppos;
1873                 len  -= *ppos;
1874
1875                 if (len > *lenp)
1876                         len = *lenp;
1877                 if (len)
1878                         if(copy_to_user(buffer, data, len))
1879                                 return -EFAULT;
1880                 if (len < *lenp) {
1881                         if(put_user('\n', ((char __user *) buffer) + len))
1882                                 return -EFAULT;
1883                         len++;
1884                 }
1885                 *lenp = len;
1886                 *ppos += len;
1887         }
1888         return 0;
1889 }
1890
1891 /**
1892  * proc_dostring - read a string sysctl
1893  * @table: the sysctl table
1894  * @write: %TRUE if this is a write to the sysctl file
1895  * @filp: the file structure
1896  * @buffer: the user buffer
1897  * @lenp: the size of the user buffer
1898  * @ppos: file position
1899  *
1900  * Reads/writes a string from/to the user buffer. If the kernel
1901  * buffer provided is not large enough to hold the string, the
1902  * string is truncated. The copied string is %NULL-terminated.
1903  * If the string is being read by the user process, it is copied
1904  * and a newline '\n' is added. It is truncated if the buffer is
1905  * not large enough.
1906  *
1907  * Returns 0 on success.
1908  */
1909 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1910                   void __user *buffer, size_t *lenp, loff_t *ppos)
1911 {
1912         return _proc_do_string(table->data, table->maxlen, write, filp,
1913                                buffer, lenp, ppos);
1914 }
1915
1916
1917 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1918                                  int *valp,
1919                                  int write, void *data)
1920 {
1921         if (write) {
1922                 *valp = *negp ? -*lvalp : *lvalp;
1923         } else {
1924                 int val = *valp;
1925                 if (val < 0) {
1926                         *negp = -1;
1927                         *lvalp = (unsigned long)-val;
1928                 } else {
1929                         *negp = 0;
1930                         *lvalp = (unsigned long)val;
1931                 }
1932         }
1933         return 0;
1934 }
1935
1936 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1937                   int write, struct file *filp, void __user *buffer,
1938                   size_t *lenp, loff_t *ppos,
1939                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1940                               int write, void *data),
1941                   void *data)
1942 {
1943 #define TMPBUFLEN 21
1944         int *i, vleft, first=1, neg, val;
1945         unsigned long lval;
1946         size_t left, len;
1947
1948         char buf[TMPBUFLEN], *p;
1949         char __user *s = buffer;
1950
1951         if (!tbl_data || !table->maxlen || !*lenp ||
1952             (*ppos && !write)) {
1953                 *lenp = 0;
1954                 return 0;
1955         }
1956
1957         i = (int *) tbl_data;
1958         vleft = table->maxlen / sizeof(*i);
1959         left = *lenp;
1960
1961         if (!conv)
1962                 conv = do_proc_dointvec_conv;
1963
1964         for (; left && vleft--; i++, first=0) {
1965                 if (write) {
1966                         while (left) {
1967                                 char c;
1968                                 if (get_user(c, s))
1969                                         return -EFAULT;
1970                                 if (!isspace(c))
1971                                         break;
1972                                 left--;
1973                                 s++;
1974                         }
1975                         if (!left)
1976                                 break;
1977                         neg = 0;
1978                         len = left;
1979                         if (len > sizeof(buf) - 1)
1980                                 len = sizeof(buf) - 1;
1981                         if (copy_from_user(buf, s, len))
1982                                 return -EFAULT;
1983                         buf[len] = 0;
1984                         p = buf;
1985                         if (*p == '-' && left > 1) {
1986                                 neg = 1;
1987                                 p++;
1988                         }
1989                         if (*p < '0' || *p > '9')
1990                                 break;
1991
1992                         lval = simple_strtoul(p, &p, 0);
1993
1994                         len = p-buf;
1995                         if ((len < left) && *p && !isspace(*p))
1996                                 break;
1997                         if (neg)
1998                                 val = -val;
1999                         s += len;
2000                         left -= len;
2001
2002                         if (conv(&neg, &lval, i, 1, data))
2003                                 break;
2004                 } else {
2005                         p = buf;
2006                         if (!first)
2007                                 *p++ = '\t';
2008
2009                         if (conv(&neg, &lval, i, 0, data))
2010                                 break;
2011
2012                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2013                         len = strlen(buf);
2014                         if (len > left)
2015                                 len = left;
2016                         if(copy_to_user(s, buf, len))
2017                                 return -EFAULT;
2018                         left -= len;
2019                         s += len;
2020                 }
2021         }
2022
2023         if (!write && !first && left) {
2024                 if(put_user('\n', s))
2025                         return -EFAULT;
2026                 left--, s++;
2027         }
2028         if (write) {
2029                 while (left) {
2030                         char c;
2031                         if (get_user(c, s++))
2032                                 return -EFAULT;
2033                         if (!isspace(c))
2034                                 break;
2035                         left--;
2036                 }
2037         }
2038         if (write && first)
2039                 return -EINVAL;
2040         *lenp -= left;
2041         *ppos += *lenp;
2042         return 0;
2043 #undef TMPBUFLEN
2044 }
2045
2046 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2047                   void __user *buffer, size_t *lenp, loff_t *ppos,
2048                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2049                               int write, void *data),
2050                   void *data)
2051 {
2052         return __do_proc_dointvec(table->data, table, write, filp,
2053                         buffer, lenp, ppos, conv, data);
2054 }
2055
2056 /**
2057  * proc_dointvec - read a vector of integers
2058  * @table: the sysctl table
2059  * @write: %TRUE if this is a write to the sysctl file
2060  * @filp: the file structure
2061  * @buffer: the user buffer
2062  * @lenp: the size of the user buffer
2063  * @ppos: file position
2064  *
2065  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2066  * values from/to the user buffer, treated as an ASCII string.
2067  *
2068  * Returns 0 on success.
2069  */
2070 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2071                      void __user *buffer, size_t *lenp, loff_t *ppos)
2072 {
2073     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2074                             NULL,NULL);
2075 }
2076
2077 #define OP_SET  0
2078 #define OP_AND  1
2079 #define OP_OR   2
2080
2081 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2082                                       int *valp,
2083                                       int write, void *data)
2084 {
2085         int op = *(int *)data;
2086         if (write) {
2087                 int val = *negp ? -*lvalp : *lvalp;
2088                 switch(op) {
2089                 case OP_SET:    *valp = val; break;
2090                 case OP_AND:    *valp &= val; break;
2091                 case OP_OR:     *valp |= val; break;
2092                 }
2093         } else {
2094                 int val = *valp;
2095                 if (val < 0) {
2096                         *negp = -1;
2097                         *lvalp = (unsigned long)-val;
2098                 } else {
2099                         *negp = 0;
2100                         *lvalp = (unsigned long)val;
2101                 }
2102         }
2103         return 0;
2104 }
2105
2106 /*
2107  *      Taint values can only be increased
2108  */
2109 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2110                                void __user *buffer, size_t *lenp, loff_t *ppos)
2111 {
2112         int op;
2113
2114         if (write && !capable(CAP_SYS_ADMIN))
2115                 return -EPERM;
2116
2117         op = OP_OR;
2118         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2119                                 do_proc_dointvec_bset_conv,&op);
2120 }
2121
2122 struct do_proc_dointvec_minmax_conv_param {
2123         int *min;
2124         int *max;
2125 };
2126
2127 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2128                                         int *valp,
2129                                         int write, void *data)
2130 {
2131         struct do_proc_dointvec_minmax_conv_param *param = data;
2132         if (write) {
2133                 int val = *negp ? -*lvalp : *lvalp;
2134                 if ((param->min && *param->min > val) ||
2135                     (param->max && *param->max < val))
2136                         return -EINVAL;
2137                 *valp = val;
2138         } else {
2139                 int val = *valp;
2140                 if (val < 0) {
2141                         *negp = -1;
2142                         *lvalp = (unsigned long)-val;
2143                 } else {
2144                         *negp = 0;
2145                         *lvalp = (unsigned long)val;
2146                 }
2147         }
2148         return 0;
2149 }
2150
2151 /**
2152  * proc_dointvec_minmax - read a vector of integers with min/max values
2153  * @table: the sysctl table
2154  * @write: %TRUE if this is a write to the sysctl file
2155  * @filp: the file structure
2156  * @buffer: the user buffer
2157  * @lenp: the size of the user buffer
2158  * @ppos: file position
2159  *
2160  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2161  * values from/to the user buffer, treated as an ASCII string.
2162  *
2163  * This routine will ensure the values are within the range specified by
2164  * table->extra1 (min) and table->extra2 (max).
2165  *
2166  * Returns 0 on success.
2167  */
2168 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2169                   void __user *buffer, size_t *lenp, loff_t *ppos)
2170 {
2171         struct do_proc_dointvec_minmax_conv_param param = {
2172                 .min = (int *) table->extra1,
2173                 .max = (int *) table->extra2,
2174         };
2175         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2176                                 do_proc_dointvec_minmax_conv, &param);
2177 }
2178
2179 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2180                                      struct file *filp,
2181                                      void __user *buffer,
2182                                      size_t *lenp, loff_t *ppos,
2183                                      unsigned long convmul,
2184                                      unsigned long convdiv)
2185 {
2186 #define TMPBUFLEN 21
2187         unsigned long *i, *min, *max, val;
2188         int vleft, first=1, neg;
2189         size_t len, left;
2190         char buf[TMPBUFLEN], *p;
2191         char __user *s = buffer;
2192
2193         if (!data || !table->maxlen || !*lenp ||
2194             (*ppos && !write)) {
2195                 *lenp = 0;
2196                 return 0;
2197         }
2198
2199         i = (unsigned long *) data;
2200         min = (unsigned long *) table->extra1;
2201         max = (unsigned long *) table->extra2;
2202         vleft = table->maxlen / sizeof(unsigned long);
2203         left = *lenp;
2204
2205         for (; left && vleft--; i++, min++, max++, first=0) {
2206                 if (write) {
2207                         while (left) {
2208                                 char c;
2209                                 if (get_user(c, s))
2210                                         return -EFAULT;
2211                                 if (!isspace(c))
2212                                         break;
2213                                 left--;
2214                                 s++;
2215                         }
2216                         if (!left)
2217                                 break;
2218                         neg = 0;
2219                         len = left;
2220                         if (len > TMPBUFLEN-1)
2221                                 len = TMPBUFLEN-1;
2222                         if (copy_from_user(buf, s, len))
2223                                 return -EFAULT;
2224                         buf[len] = 0;
2225                         p = buf;
2226                         if (*p == '-' && left > 1) {
2227                                 neg = 1;
2228                                 p++;
2229                         }
2230                         if (*p < '0' || *p > '9')
2231                                 break;
2232                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2233                         len = p-buf;
2234                         if ((len < left) && *p && !isspace(*p))
2235                                 break;
2236                         if (neg)
2237                                 val = -val;
2238                         s += len;
2239                         left -= len;
2240
2241                         if(neg)
2242                                 continue;
2243                         if ((min && val < *min) || (max && val > *max))
2244                                 continue;
2245                         *i = val;
2246                 } else {
2247                         p = buf;
2248                         if (!first)
2249                                 *p++ = '\t';
2250                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2251                         len = strlen(buf);
2252                         if (len > left)
2253                                 len = left;
2254                         if(copy_to_user(s, buf, len))
2255                                 return -EFAULT;
2256                         left -= len;
2257                         s += len;
2258                 }
2259         }
2260
2261         if (!write && !first && left) {
2262                 if(put_user('\n', s))
2263                         return -EFAULT;
2264                 left--, s++;
2265         }
2266         if (write) {
2267                 while (left) {
2268                         char c;
2269                         if (get_user(c, s++))
2270                                 return -EFAULT;
2271                         if (!isspace(c))
2272                                 break;
2273                         left--;
2274                 }
2275         }
2276         if (write && first)
2277                 return -EINVAL;
2278         *lenp -= left;
2279         *ppos += *lenp;
2280         return 0;
2281 #undef TMPBUFLEN
2282 }
2283
2284 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2285                                      struct file *filp,
2286                                      void __user *buffer,
2287                                      size_t *lenp, loff_t *ppos,
2288                                      unsigned long convmul,
2289                                      unsigned long convdiv)
2290 {
2291         return __do_proc_doulongvec_minmax(table->data, table, write,
2292                         filp, buffer, lenp, ppos, convmul, convdiv);
2293 }
2294
2295 /**
2296  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2297  * @table: the sysctl table
2298  * @write: %TRUE if this is a write to the sysctl file
2299  * @filp: the file structure
2300  * @buffer: the user buffer
2301  * @lenp: the size of the user buffer
2302  * @ppos: file position
2303  *
2304  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2305  * values from/to the user buffer, treated as an ASCII string.
2306  *
2307  * This routine will ensure the values are within the range specified by
2308  * table->extra1 (min) and table->extra2 (max).
2309  *
2310  * Returns 0 on success.
2311  */
2312 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2313                            void __user *buffer, size_t *lenp, loff_t *ppos)
2314 {
2315     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2316 }
2317
2318 /**
2319  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2320  * @table: the sysctl table
2321  * @write: %TRUE if this is a write to the sysctl file
2322  * @filp: the file structure
2323  * @buffer: the user buffer
2324  * @lenp: the size of the user buffer
2325  * @ppos: file position
2326  *
2327  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2328  * values from/to the user buffer, treated as an ASCII string. The values
2329  * are treated as milliseconds, and converted to jiffies when they are stored.
2330  *
2331  * This routine will ensure the values are within the range specified by
2332  * table->extra1 (min) and table->extra2 (max).
2333  *
2334  * Returns 0 on success.
2335  */
2336 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2337                                       struct file *filp,
2338                                       void __user *buffer,
2339                                       size_t *lenp, loff_t *ppos)
2340 {
2341     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2342                                      lenp, ppos, HZ, 1000l);
2343 }
2344
2345
2346 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2347                                          int *valp,
2348                                          int write, void *data)
2349 {
2350         if (write) {
2351                 if (*lvalp > LONG_MAX / HZ)
2352                         return 1;
2353                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2354         } else {
2355                 int val = *valp;
2356                 unsigned long lval;
2357                 if (val < 0) {
2358                         *negp = -1;
2359                         lval = (unsigned long)-val;
2360                 } else {
2361                         *negp = 0;
2362                         lval = (unsigned long)val;
2363                 }
2364                 *lvalp = lval / HZ;
2365         }
2366         return 0;
2367 }
2368
2369 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2370                                                 int *valp,
2371                                                 int write, void *data)
2372 {
2373         if (write) {
2374                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2375                         return 1;
2376                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2377         } else {
2378                 int val = *valp;
2379                 unsigned long lval;
2380                 if (val < 0) {
2381                         *negp = -1;
2382                         lval = (unsigned long)-val;
2383                 } else {
2384                         *negp = 0;
2385                         lval = (unsigned long)val;
2386                 }
2387                 *lvalp = jiffies_to_clock_t(lval);
2388         }
2389         return 0;
2390 }
2391
2392 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2393                                             int *valp,
2394                                             int write, void *data)
2395 {
2396         if (write) {
2397                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2398         } else {
2399                 int val = *valp;
2400                 unsigned long lval;
2401                 if (val < 0) {
2402                         *negp = -1;
2403                         lval = (unsigned long)-val;
2404                 } else {
2405                         *negp = 0;
2406                         lval = (unsigned long)val;
2407                 }
2408                 *lvalp = jiffies_to_msecs(lval);
2409         }
2410         return 0;
2411 }
2412
2413 /**
2414  * proc_dointvec_jiffies - read a vector of integers as seconds
2415  * @table: the sysctl table
2416  * @write: %TRUE if this is a write to the sysctl file
2417  * @filp: the file structure
2418  * @buffer: the user buffer
2419  * @lenp: the size of the user buffer
2420  * @ppos: file position
2421  *
2422  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2423  * values from/to the user buffer, treated as an ASCII string.
2424  * The values read are assumed to be in seconds, and are converted into
2425  * jiffies.
2426  *
2427  * Returns 0 on success.
2428  */
2429 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2430                           void __user *buffer, size_t *lenp, loff_t *ppos)
2431 {
2432     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2433                             do_proc_dointvec_jiffies_conv,NULL);
2434 }
2435
2436 /**
2437  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2438  * @table: the sysctl table
2439  * @write: %TRUE if this is a write to the sysctl file
2440  * @filp: the file structure
2441  * @buffer: the user buffer
2442  * @lenp: the size of the user buffer
2443  * @ppos: pointer to the file position
2444  *
2445  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2446  * values from/to the user buffer, treated as an ASCII string.
2447  * The values read are assumed to be in 1/USER_HZ seconds, and
2448  * are converted into jiffies.
2449  *
2450  * Returns 0 on success.
2451  */
2452 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2453                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2454 {
2455     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2456                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2457 }
2458
2459 /**
2460  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2461  * @table: the sysctl table
2462  * @write: %TRUE if this is a write to the sysctl file
2463  * @filp: the file structure
2464  * @buffer: the user buffer
2465  * @lenp: the size of the user buffer
2466  * @ppos: file position
2467  * @ppos: the current position in the file
2468  *
2469  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2470  * values from/to the user buffer, treated as an ASCII string.
2471  * The values read are assumed to be in 1/1000 seconds, and
2472  * are converted into jiffies.
2473  *
2474  * Returns 0 on success.
2475  */
2476 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2477                              void __user *buffer, size_t *lenp, loff_t *ppos)
2478 {
2479         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2480                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2481 }
2482
2483 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2484                            void __user *buffer, size_t *lenp, loff_t *ppos)
2485 {
2486         struct pid *new_pid;
2487         pid_t tmp;
2488         int r;
2489
2490         tmp = pid_vnr(cad_pid);
2491
2492         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2493                                lenp, ppos, NULL, NULL);
2494         if (r || !write)
2495                 return r;
2496
2497         new_pid = find_get_pid(tmp);
2498         if (!new_pid)
2499                 return -ESRCH;
2500
2501         put_pid(xchg(&cad_pid, new_pid));
2502         return 0;
2503 }
2504
2505 #else /* CONFIG_PROC_FS */
2506
2507 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2508                   void __user *buffer, size_t *lenp, loff_t *ppos)
2509 {
2510         return -ENOSYS;
2511 }
2512
2513 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2514                   void __user *buffer, size_t *lenp, loff_t *ppos)
2515 {
2516         return -ENOSYS;
2517 }
2518
2519 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2520                     void __user *buffer, size_t *lenp, loff_t *ppos)
2521 {
2522         return -ENOSYS;
2523 }
2524
2525 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2526                     void __user *buffer, size_t *lenp, loff_t *ppos)
2527 {
2528         return -ENOSYS;
2529 }
2530
2531 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2532                     void __user *buffer, size_t *lenp, loff_t *ppos)
2533 {
2534         return -ENOSYS;
2535 }
2536
2537 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2538                              void __user *buffer, size_t *lenp, loff_t *ppos)
2539 {
2540         return -ENOSYS;
2541 }
2542
2543 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2544                     void __user *buffer, size_t *lenp, loff_t *ppos)
2545 {
2546         return -ENOSYS;
2547 }
2548
2549 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2550                                       struct file *filp,
2551                                       void __user *buffer,
2552                                       size_t *lenp, loff_t *ppos)
2553 {
2554     return -ENOSYS;
2555 }
2556
2557
2558 #endif /* CONFIG_PROC_FS */
2559
2560
2561 #ifdef CONFIG_SYSCTL_SYSCALL
2562 /*
2563  * General sysctl support routines
2564  */
2565
2566 /* The generic sysctl data routine (used if no strategy routine supplied) */
2567 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2568                 void __user *oldval, size_t __user *oldlenp,
2569                 void __user *newval, size_t newlen)
2570 {
2571         size_t len;
2572
2573         /* Get out of I don't have a variable */
2574         if (!table->data || !table->maxlen)
2575                 return -ENOTDIR;
2576
2577         if (oldval && oldlenp) {
2578                 if (get_user(len, oldlenp))
2579                         return -EFAULT;
2580                 if (len) {
2581                         if (len > table->maxlen)
2582                                 len = table->maxlen;
2583                         if (copy_to_user(oldval, table->data, len))
2584                                 return -EFAULT;
2585                         if (put_user(len, oldlenp))
2586                                 return -EFAULT;
2587                 }
2588         }
2589
2590         if (newval && newlen) {
2591                 if (newlen > table->maxlen)
2592                         newlen = table->maxlen;
2593
2594                 if (copy_from_user(table->data, newval, newlen))
2595                         return -EFAULT;
2596         }
2597         return 1;
2598 }
2599
2600 /* The generic string strategy routine: */
2601 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2602                   void __user *oldval, size_t __user *oldlenp,
2603                   void __user *newval, size_t newlen)
2604 {
2605         if (!table->data || !table->maxlen)
2606                 return -ENOTDIR;
2607
2608         if (oldval && oldlenp) {
2609                 size_t bufsize;
2610                 if (get_user(bufsize, oldlenp))
2611                         return -EFAULT;
2612                 if (bufsize) {
2613                         size_t len = strlen(table->data), copied;
2614
2615                         /* This shouldn't trigger for a well-formed sysctl */
2616                         if (len > table->maxlen)
2617                                 len = table->maxlen;
2618
2619                         /* Copy up to a max of bufsize-1 bytes of the string */
2620                         copied = (len >= bufsize) ? bufsize - 1 : len;
2621
2622                         if (copy_to_user(oldval, table->data, copied) ||
2623                             put_user(0, (char __user *)(oldval + copied)))
2624                                 return -EFAULT;
2625                         if (put_user(len, oldlenp))
2626                                 return -EFAULT;
2627                 }
2628         }
2629         if (newval && newlen) {
2630                 size_t len = newlen;
2631                 if (len > table->maxlen)
2632                         len = table->maxlen;
2633                 if(copy_from_user(table->data, newval, len))
2634                         return -EFAULT;
2635                 if (len == table->maxlen)
2636                         len--;
2637                 ((char *) table->data)[len] = 0;
2638         }
2639         return 1;
2640 }
2641
2642 /*
2643  * This function makes sure that all of the integers in the vector
2644  * are between the minimum and maximum values given in the arrays
2645  * table->extra1 and table->extra2, respectively.
2646  */
2647 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2648                 void __user *oldval, size_t __user *oldlenp,
2649                 void __user *newval, size_t newlen)
2650 {
2651
2652         if (newval && newlen) {
2653                 int __user *vec = (int __user *) newval;
2654                 int *min = (int *) table->extra1;
2655                 int *max = (int *) table->extra2;
2656                 size_t length;
2657                 int i;
2658
2659                 if (newlen % sizeof(int) != 0)
2660                         return -EINVAL;
2661
2662                 if (!table->extra1 && !table->extra2)
2663                         return 0;
2664
2665                 if (newlen > table->maxlen)
2666                         newlen = table->maxlen;
2667                 length = newlen / sizeof(int);
2668
2669                 for (i = 0; i < length; i++) {
2670                         int value;
2671                         if (get_user(value, vec + i))
2672                                 return -EFAULT;
2673                         if (min && value < min[i])
2674                                 return -EINVAL;
2675                         if (max && value > max[i])
2676                                 return -EINVAL;
2677                 }
2678         }
2679         return 0;
2680 }
2681
2682 /* Strategy function to convert jiffies to seconds */
2683 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2684                 void __user *oldval, size_t __user *oldlenp,
2685                 void __user *newval, size_t newlen)
2686 {
2687         if (oldval && oldlenp) {
2688                 size_t olen;
2689
2690                 if (get_user(olen, oldlenp))
2691                         return -EFAULT;
2692                 if (olen) {
2693                         int val;
2694
2695                         if (olen < sizeof(int))
2696                                 return -EINVAL;
2697
2698                         val = *(int *)(table->data) / HZ;
2699                         if (put_user(val, (int __user *)oldval))
2700                                 return -EFAULT;
2701                         if (put_user(sizeof(int), oldlenp))
2702                                 return -EFAULT;
2703                 }
2704         }
2705         if (newval && newlen) {
2706                 int new;
2707                 if (newlen != sizeof(int))
2708                         return -EINVAL;
2709                 if (get_user(new, (int __user *)newval))
2710                         return -EFAULT;
2711                 *(int *)(table->data) = new*HZ;
2712         }
2713         return 1;
2714 }
2715
2716 /* Strategy function to convert jiffies to seconds */
2717 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2718                 void __user *oldval, size_t __user *oldlenp,
2719                 void __user *newval, size_t newlen)
2720 {
2721         if (oldval && oldlenp) {
2722                 size_t olen;
2723
2724                 if (get_user(olen, oldlenp))
2725                         return -EFAULT;
2726                 if (olen) {
2727                         int val;
2728
2729                         if (olen < sizeof(int))
2730                                 return -EINVAL;
2731
2732                         val = jiffies_to_msecs(*(int *)(table->data));
2733                         if (put_user(val, (int __user *)oldval))
2734                                 return -EFAULT;
2735                         if (put_user(sizeof(int), oldlenp))
2736                                 return -EFAULT;
2737                 }
2738         }
2739         if (newval && newlen) {
2740                 int new;
2741                 if (newlen != sizeof(int))
2742                         return -EINVAL;
2743                 if (get_user(new, (int __user *)newval))
2744                         return -EFAULT;
2745                 *(int *)(table->data) = msecs_to_jiffies(new);
2746         }
2747         return 1;
2748 }
2749
2750
2751
2752 #else /* CONFIG_SYSCTL_SYSCALL */
2753
2754
2755 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2756 {
2757         struct __sysctl_args tmp;
2758         int error;
2759
2760         if (copy_from_user(&tmp, args, sizeof(tmp)))
2761                 return -EFAULT;
2762
2763         error = deprecated_sysctl_warning(&tmp);
2764
2765         /* If no error reading the parameters then just -ENOSYS ... */
2766         if (!error)
2767                 error = -ENOSYS;
2768
2769         return error;
2770 }
2771
2772 int sysctl_data(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_string(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_intvec(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 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2794                 void __user *oldval, size_t __user *oldlenp,
2795                 void __user *newval, size_t newlen)
2796 {
2797         return -ENOSYS;
2798 }
2799
2800 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2801                 void __user *oldval, size_t __user *oldlenp,
2802                 void __user *newval, size_t newlen)
2803 {
2804         return -ENOSYS;
2805 }
2806
2807 #endif /* CONFIG_SYSCTL_SYSCALL */
2808
2809 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2810 {
2811         static int msg_count;
2812         int name[CTL_MAXNAME];
2813         int i;
2814
2815         /* Check args->nlen. */
2816         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2817                 return -ENOTDIR;
2818
2819         /* Read in the sysctl name for better debug message logging */
2820         for (i = 0; i < args->nlen; i++)
2821                 if (get_user(name[i], args->name + i))
2822                         return -EFAULT;
2823
2824         /* Ignore accesses to kernel.version */
2825         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2826                 return 0;
2827
2828         if (msg_count < 5) {
2829                 msg_count++;
2830                 printk(KERN_INFO
2831                         "warning: process `%s' used the deprecated sysctl "
2832                         "system call with ", current->comm);
2833                 for (i = 0; i < args->nlen; i++)
2834                         printk("%d.", name[i]);
2835                 printk("\n");
2836         }
2837         return 0;
2838 }
2839
2840 /*
2841  * No sense putting this after each symbol definition, twice,
2842  * exception granted :-)
2843  */
2844 EXPORT_SYMBOL(proc_dointvec);
2845 EXPORT_SYMBOL(proc_dointvec_jiffies);
2846 EXPORT_SYMBOL(proc_dointvec_minmax);
2847 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2848 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2849 EXPORT_SYMBOL(proc_dostring);
2850 EXPORT_SYMBOL(proc_doulongvec_minmax);
2851 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2852 EXPORT_SYMBOL(register_sysctl_table);
2853 EXPORT_SYMBOL(register_sysctl_paths);
2854 EXPORT_SYMBOL(sysctl_intvec);
2855 EXPORT_SYMBOL(sysctl_jiffies);
2856 EXPORT_SYMBOL(sysctl_ms_jiffies);
2857 EXPORT_SYMBOL(sysctl_string);
2858 EXPORT_SYMBOL(sysctl_data);
2859 EXPORT_SYMBOL(unregister_sysctl_table);