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

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