kernel/sysctl.c

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