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/capability.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/security.h>
  41 #include <linux/initrd.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49
  50 #include <asm/uaccess.h>
  51 #include <asm/processor.h>
  52
  53 #ifdef CONFIG_X86
  54 #include <asm/nmi.h>
  55 #include <asm/stacktrace.h>
  56 #endif
  57
  58 #if defined(CONFIG_SYSCTL)
  59
  60 /* External variables not in a header file. */
  61 extern int C_A_D;
  62 extern int print_fatal_signals;
  63 extern int sysctl_overcommit_memory;
  64 extern int sysctl_overcommit_ratio;
  65 extern int sysctl_panic_on_oom;
  66 extern int sysctl_oom_kill_allocating_task;
  67 extern int max_threads;
  68 extern int core_uses_pid;
  69 extern int suid_dumpable;
  70 extern char core_pattern[];
  71 extern int pid_max;
  72 extern int min_free_kbytes;
  73 extern int printk_ratelimit_jiffies;
  74 extern int printk_ratelimit_burst;
  75 extern int pid_max_min, pid_max_max;
  76 extern int sysctl_drop_caches;
  77 extern int percpu_pagelist_fraction;
  78 extern int compat_log;
  79 extern int maps_protect;
  80 extern int sysctl_stat_interval;
  81 extern int audit_argv_kb;
  82
  83 /* Constants used for minimum and  maximum */
  84 #ifdef CONFIG_DETECT_SOFTLOCKUP
  85 static int one = 1;
  86 static int sixty = 60;
  87 #endif
  88
  89 #ifdef CONFIG_MMU
  90 static int two = 2;
  91 #endif
  92
  93 static int zero;
  94 static int one_hundred = 100;
  95
  96 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
  97 static int maxolduid = 65535;
  98 static int minolduid;
  99 static int min_percpu_pagelist_fract = 8;
 100
 101 static int ngroups_max = NGROUPS_MAX;
 102
 103 #ifdef CONFIG_KMOD
 104 extern char modprobe_path[];
 105 #endif
 106 #ifdef CONFIG_CHR_DEV_SG
 107 extern int sg_big_buff;
 108 #endif
 109
 110 #ifdef __sparc__
 111 extern char reboot_command [];
 112 extern int stop_a_enabled;
 113 extern int scons_pwroff;
 114 #endif
 115
 116 #ifdef __hppa__
 117 extern int pwrsw_enabled;
 118 extern int unaligned_enabled;
 119 #endif
 120
 121 #ifdef CONFIG_S390
 122 #ifdef CONFIG_MATHEMU
 123 extern int sysctl_ieee_emulation_warnings;
 124 #endif
 125 extern int sysctl_userprocess_debug;
 126 extern int spin_retry;
 127 #endif
 128
 129 extern int sysctl_hz_timer;
 130
 131 #ifdef CONFIG_BSD_PROCESS_ACCT
 132 extern int acct_parm[];
 133 #endif
 134
 135 #ifdef CONFIG_IA64
 136 extern int no_unaligned_warning;
 137 #endif
 138
 139 #ifdef CONFIG_RT_MUTEXES
 140 extern int max_lock_depth;
 141 #endif
 142
 143 #ifdef CONFIG_SYSCTL_SYSCALL
 144 static int parse_table(int __user *, int, void __user *, size_t __user *,
 145                 void __user *, size_t, ctl_table *);
 146 #endif
 147
 148
 149 #ifdef CONFIG_PROC_SYSCTL
 150 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
 151                   void __user *buffer, size_t *lenp, loff_t *ppos);
 152 static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp,
 153                                void __user *buffer, size_t *lenp, loff_t *ppos);
 154 #endif
 155
 156 static ctl_table root_table[];
 157 static struct ctl_table_header root_table_header =
 158         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 159
 160 static ctl_table kern_table[];
 161 static ctl_table vm_table[];
 162 static ctl_table fs_table[];
 163 static ctl_table debug_table[];
 164 static ctl_table dev_table[];
 165 extern ctl_table random_table[];
 166 #ifdef CONFIG_UNIX98_PTYS
 167 extern ctl_table pty_table[];
 168 #endif
 169 #ifdef CONFIG_INOTIFY_USER
 170 extern ctl_table inotify_table[];
 171 #endif
 172
 173 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 174 int sysctl_legacy_va_layout;
 175 #endif
 176
 177 extern int prove_locking;
 178 extern int lock_stat;
 179
 180 /* The default sysctl tables: */
 181
 182 static ctl_table root_table[] = {
 183         {
 184                 .ctl_name       = CTL_KERN,
 185                 .procname       = "kernel",
 186                 .mode           = 0555,
 187                 .child          = kern_table,
 188         },
 189         {
 190                 .ctl_name       = CTL_VM,
 191                 .procname       = "vm",
 192                 .mode           = 0555,
 193                 .child          = vm_table,
 194         },
 195 #ifdef CONFIG_NET
 196         {
 197                 .ctl_name       = CTL_NET,
 198                 .procname       = "net",
 199                 .mode           = 0555,
 200                 .child          = net_table,
 201         },
 202 #endif
 203         {
 204                 .ctl_name       = CTL_FS,
 205                 .procname       = "fs",
 206                 .mode           = 0555,
 207                 .child          = fs_table,
 208         },
 209         {
 210                 .ctl_name       = CTL_DEBUG,
 211                 .procname       = "debug",
 212                 .mode           = 0555,
 213                 .child          = debug_table,
 214         },
 215         {
 216                 .ctl_name       = CTL_DEV,
 217                 .procname       = "dev",
 218                 .mode           = 0555,
 219                 .child          = dev_table,
 220         },
 221 /*
 222  * NOTE: do not add new entries to this table unless you have read
 223  * Documentation/sysctl/ctl_unnumbered.txt
 224  */
 225         { .ctl_name = 0 }
 226 };
 227
 228 #ifdef CONFIG_SCHED_DEBUG
 229 static unsigned long min_sched_granularity_ns = 100000;         /* 100 usecs */
 230 static unsigned long max_sched_granularity_ns = 1000000000;     /* 1 second */
 231 static unsigned long min_wakeup_granularity_ns;                 /* 0 usecs */
 232 static unsigned long max_wakeup_granularity_ns = 1000000000;    /* 1 second */
 233 #endif
 234
 235 static ctl_table kern_table[] = {
 236 #ifdef CONFIG_SCHED_DEBUG
 237         {
 238                 .ctl_name       = CTL_UNNUMBERED,
 239                 .procname       = "sched_nr_latency",
 240                 .data           = &sysctl_sched_nr_latency,
 241                 .maxlen         = sizeof(unsigned int),
 242                 .mode           = 0644,
 243                 .proc_handler   = &proc_dointvec,
 244         },
 245         {
 246                 .ctl_name       = CTL_UNNUMBERED,
 247                 .procname       = "sched_latency_ns",
 248                 .data           = &sysctl_sched_latency,
 249                 .maxlen         = sizeof(unsigned int),
 250                 .mode           = 0644,
 251                 .proc_handler   = &proc_dointvec_minmax,
 252                 .strategy       = &sysctl_intvec,
 253                 .extra1         = &min_sched_granularity_ns,
 254                 .extra2         = &max_sched_granularity_ns,
 255         },
 256         {
 257                 .ctl_name       = CTL_UNNUMBERED,
 258                 .procname       = "sched_wakeup_granularity_ns",
 259                 .data           = &sysctl_sched_wakeup_granularity,
 260                 .maxlen         = sizeof(unsigned int),
 261                 .mode           = 0644,
 262                 .proc_handler   = &proc_dointvec_minmax,
 263                 .strategy       = &sysctl_intvec,
 264                 .extra1         = &min_wakeup_granularity_ns,
 265                 .extra2         = &max_wakeup_granularity_ns,
 266         },
 267         {
 268                 .ctl_name       = CTL_UNNUMBERED,
 269                 .procname       = "sched_batch_wakeup_granularity_ns",
 270                 .data           = &sysctl_sched_batch_wakeup_granularity,
 271                 .maxlen         = sizeof(unsigned int),
 272                 .mode           = 0644,
 273                 .proc_handler   = &proc_dointvec_minmax,
 274                 .strategy       = &sysctl_intvec,
 275                 .extra1         = &min_wakeup_granularity_ns,
 276                 .extra2         = &max_wakeup_granularity_ns,
 277         },
 278         {
 279                 .ctl_name       = CTL_UNNUMBERED,
 280                 .procname       = "sched_child_runs_first",
 281                 .data           = &sysctl_sched_child_runs_first,
 282                 .maxlen         = sizeof(unsigned int),
 283                 .mode           = 0644,
 284                 .proc_handler   = &proc_dointvec,
 285         },
 286         {
 287                 .ctl_name       = CTL_UNNUMBERED,
 288                 .procname       = "sched_features",
 289                 .data           = &sysctl_sched_features,
 290                 .maxlen         = sizeof(unsigned int),
 291                 .mode           = 0644,
 292                 .proc_handler   = &proc_dointvec,
 293         },
 294         {
 295                 .ctl_name       = CTL_UNNUMBERED,
 296                 .procname       = "sched_migration_cost",
 297                 .data           = &sysctl_sched_migration_cost,
 298                 .maxlen         = sizeof(unsigned int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec,
 301         },
 302 #endif
 303         {
 304                 .ctl_name       = CTL_UNNUMBERED,
 305                 .procname       = "sched_compat_yield",
 306                 .data           = &sysctl_sched_compat_yield,
 307                 .maxlen         = sizeof(unsigned int),
 308                 .mode           = 0644,
 309                 .proc_handler   = &proc_dointvec,
 310         },
 311 #ifdef CONFIG_PROVE_LOCKING
 312         {
 313                 .ctl_name       = CTL_UNNUMBERED,
 314                 .procname       = "prove_locking",
 315                 .data           = &prove_locking,
 316                 .maxlen         = sizeof(int),
 317                 .mode           = 0644,
 318                 .proc_handler   = &proc_dointvec,
 319         },
 320 #endif
 321 #ifdef CONFIG_LOCK_STAT
 322         {
 323                 .ctl_name       = CTL_UNNUMBERED,
 324                 .procname       = "lock_stat",
 325                 .data           = &lock_stat,
 326                 .maxlen         = sizeof(int),
 327                 .mode           = 0644,
 328                 .proc_handler   = &proc_dointvec,
 329         },
 330 #endif
 331         {
 332                 .ctl_name       = KERN_PANIC,
 333                 .procname       = "panic",
 334                 .data           = &panic_timeout,
 335                 .maxlen         = sizeof(int),
 336                 .mode           = 0644,
 337                 .proc_handler   = &proc_dointvec,
 338         },
 339         {
 340                 .ctl_name       = KERN_CORE_USES_PID,
 341                 .procname       = "core_uses_pid",
 342                 .data           = &core_uses_pid,
 343                 .maxlen         = sizeof(int),
 344                 .mode           = 0644,
 345                 .proc_handler   = &proc_dointvec,
 346         },
 347 #ifdef CONFIG_AUDITSYSCALL
 348         {
 349                 .ctl_name       = CTL_UNNUMBERED,
 350                 .procname       = "audit_argv_kb",
 351                 .data           = &audit_argv_kb,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = &proc_dointvec,
 355         },
 356 #endif
 357         {
 358                 .ctl_name       = KERN_CORE_PATTERN,
 359                 .procname       = "core_pattern",
 360                 .data           = core_pattern,
 361                 .maxlen         = CORENAME_MAX_SIZE,
 362                 .mode           = 0644,
 363                 .proc_handler   = &proc_dostring,
 364                 .strategy       = &sysctl_string,
 365         },
 366 #ifdef CONFIG_PROC_SYSCTL
 367         {
 368                 .ctl_name       = KERN_TAINTED,
 369                 .procname       = "tainted",
 370                 .data           = &tainted,
 371                 .maxlen         = sizeof(int),
 372                 .mode           = 0644,
 373                 .proc_handler   = &proc_dointvec_taint,
 374         },
 375 #endif
 376         {
 377                 .ctl_name       = KERN_CAP_BSET,
 378                 .procname       = "cap-bound",
 379                 .data           = &cap_bset,
 380                 .maxlen         = sizeof(kernel_cap_t),
 381                 .mode           = 0600,
 382                 .proc_handler   = &proc_dointvec_bset,
 383         },
 384 #ifdef CONFIG_BLK_DEV_INITRD
 385         {
 386                 .ctl_name       = KERN_REALROOTDEV,
 387                 .procname       = "real-root-dev",
 388                 .data           = &real_root_dev,
 389                 .maxlen         = sizeof(int),
 390                 .mode           = 0644,
 391                 .proc_handler   = &proc_dointvec,
 392         },
 393 #endif
 394         {
 395                 .ctl_name       = CTL_UNNUMBERED,
 396                 .procname       = "print-fatal-signals",
 397                 .data           = &print_fatal_signals,
 398                 .maxlen         = sizeof(int),
 399                 .mode           = 0644,
 400                 .proc_handler   = &proc_dointvec,
 401         },
 402 #ifdef __sparc__
 403         {
 404                 .ctl_name       = KERN_SPARC_REBOOT,
 405                 .procname       = "reboot-cmd",
 406                 .data           = reboot_command,
 407                 .maxlen         = 256,
 408                 .mode           = 0644,
 409                 .proc_handler   = &proc_dostring,
 410                 .strategy       = &sysctl_string,
 411         },
 412         {
 413                 .ctl_name       = KERN_SPARC_STOP_A,
 414                 .procname       = "stop-a",
 415                 .data           = &stop_a_enabled,
 416                 .maxlen         = sizeof (int),
 417                 .mode           = 0644,
 418                 .proc_handler   = &proc_dointvec,
 419         },
 420         {
 421                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 422                 .procname       = "scons-poweroff",
 423                 .data           = &scons_pwroff,
 424                 .maxlen         = sizeof (int),
 425                 .mode           = 0644,
 426                 .proc_handler   = &proc_dointvec,
 427         },
 428 #endif
 429 #ifdef __hppa__
 430         {
 431                 .ctl_name       = KERN_HPPA_PWRSW,
 432                 .procname       = "soft-power",
 433                 .data           = &pwrsw_enabled,
 434                 .maxlen         = sizeof (int),
 435                 .mode           = 0644,
 436                 .proc_handler   = &proc_dointvec,
 437         },
 438         {
 439                 .ctl_name       = KERN_HPPA_UNALIGNED,
 440                 .procname       = "unaligned-trap",
 441                 .data           = &unaligned_enabled,
 442                 .maxlen         = sizeof (int),
 443                 .mode           = 0644,
 444                 .proc_handler   = &proc_dointvec,
 445         },
 446 #endif
 447         {
 448                 .ctl_name       = KERN_CTLALTDEL,
 449                 .procname       = "ctrl-alt-del",
 450                 .data           = &C_A_D,
 451                 .maxlen         = sizeof(int),
 452                 .mode           = 0644,
 453                 .proc_handler   = &proc_dointvec,
 454         },
 455         {
 456                 .ctl_name       = KERN_PRINTK,
 457                 .procname       = "printk",
 458                 .data           = &console_loglevel,
 459                 .maxlen         = 4*sizeof(int),
 460                 .mode           = 0644,
 461                 .proc_handler   = &proc_dointvec,
 462         },
 463 #ifdef CONFIG_KMOD
 464         {
 465                 .ctl_name       = KERN_MODPROBE,
 466                 .procname       = "modprobe",
 467                 .data           = &modprobe_path,
 468                 .maxlen         = KMOD_PATH_LEN,
 469                 .mode           = 0644,
 470                 .proc_handler   = &proc_dostring,
 471                 .strategy       = &sysctl_string,
 472         },
 473 #endif
 474 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 475         {
 476                 .ctl_name       = KERN_HOTPLUG,
 477                 .procname       = "hotplug",
 478                 .data           = &uevent_helper,
 479                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 480                 .mode           = 0644,
 481                 .proc_handler   = &proc_dostring,
 482                 .strategy       = &sysctl_string,
 483         },
 484 #endif
 485 #ifdef CONFIG_CHR_DEV_SG
 486         {
 487                 .ctl_name       = KERN_SG_BIG_BUFF,
 488                 .procname       = "sg-big-buff",
 489                 .data           = &sg_big_buff,
 490                 .maxlen         = sizeof (int),
 491                 .mode           = 0444,
 492                 .proc_handler   = &proc_dointvec,
 493         },
 494 #endif
 495 #ifdef CONFIG_BSD_PROCESS_ACCT
 496         {
 497                 .ctl_name       = KERN_ACCT,
 498                 .procname       = "acct",
 499                 .data           = &acct_parm,
 500                 .maxlen         = 3*sizeof(int),
 501                 .mode           = 0644,
 502                 .proc_handler   = &proc_dointvec,
 503         },
 504 #endif
 505 #ifdef CONFIG_MAGIC_SYSRQ
 506         {
 507                 .ctl_name       = KERN_SYSRQ,
 508                 .procname       = "sysrq",
 509                 .data           = &__sysrq_enabled,
 510                 .maxlen         = sizeof (int),
 511                 .mode           = 0644,
 512                 .proc_handler   = &proc_dointvec,
 513         },
 514 #endif
 515 #ifdef CONFIG_PROC_SYSCTL
 516         {
 517                 .ctl_name       = KERN_CADPID,
 518                 .procname       = "cad_pid",
 519                 .data           = NULL,
 520                 .maxlen         = sizeof (int),
 521                 .mode           = 0600,
 522                 .proc_handler   = &proc_do_cad_pid,
 523         },
 524 #endif
 525         {
 526                 .ctl_name       = KERN_MAX_THREADS,
 527                 .procname       = "threads-max",
 528                 .data           = &max_threads,
 529                 .maxlen         = sizeof(int),
 530                 .mode           = 0644,
 531                 .proc_handler   = &proc_dointvec,
 532         },
 533         {
 534                 .ctl_name       = KERN_RANDOM,
 535                 .procname       = "random",
 536                 .mode           = 0555,
 537                 .child          = random_table,
 538         },
 539 #ifdef CONFIG_UNIX98_PTYS
 540         {
 541                 .ctl_name       = KERN_PTY,
 542                 .procname       = "pty",
 543                 .mode           = 0555,
 544                 .child          = pty_table,
 545         },
 546 #endif
 547         {
 548                 .ctl_name       = KERN_OVERFLOWUID,
 549                 .procname       = "overflowuid",
 550                 .data           = &overflowuid,
 551                 .maxlen         = sizeof(int),
 552                 .mode           = 0644,
 553                 .proc_handler   = &proc_dointvec_minmax,
 554                 .strategy       = &sysctl_intvec,
 555                 .extra1         = &minolduid,
 556                 .extra2         = &maxolduid,
 557         },
 558         {
 559                 .ctl_name       = KERN_OVERFLOWGID,
 560                 .procname       = "overflowgid",
 561                 .data           = &overflowgid,
 562                 .maxlen         = sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = &proc_dointvec_minmax,
 565                 .strategy       = &sysctl_intvec,
 566                 .extra1         = &minolduid,
 567                 .extra2         = &maxolduid,
 568         },
 569 #ifdef CONFIG_S390
 570 #ifdef CONFIG_MATHEMU
 571         {
 572                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 573                 .procname       = "ieee_emulation_warnings",
 574                 .data           = &sysctl_ieee_emulation_warnings,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec,
 578         },
 579 #endif
 580 #ifdef CONFIG_NO_IDLE_HZ
 581         {
 582                 .ctl_name       = KERN_HZ_TIMER,
 583                 .procname       = "hz_timer",
 584                 .data           = &sysctl_hz_timer,
 585                 .maxlen         = sizeof(int),
 586                 .mode           = 0644,
 587                 .proc_handler   = &proc_dointvec,
 588         },
 589 #endif
 590         {
 591                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 592                 .procname       = "userprocess_debug",
 593                 .data           = &sysctl_userprocess_debug,
 594                 .maxlen         = sizeof(int),
 595                 .mode           = 0644,
 596                 .proc_handler   = &proc_dointvec,
 597         },
 598 #endif
 599         {
 600                 .ctl_name       = KERN_PIDMAX,
 601                 .procname       = "pid_max",
 602                 .data           = &pid_max,
 603                 .maxlen         = sizeof (int),
 604                 .mode           = 0644,
 605                 .proc_handler   = &proc_dointvec_minmax,
 606                 .strategy       = sysctl_intvec,
 607                 .extra1         = &pid_max_min,
 608                 .extra2         = &pid_max_max,
 609         },
 610         {
 611                 .ctl_name       = KERN_PANIC_ON_OOPS,
 612                 .procname       = "panic_on_oops",
 613                 .data           = &panic_on_oops,
 614                 .maxlen         = sizeof(int),
 615                 .mode           = 0644,
 616                 .proc_handler   = &proc_dointvec,
 617         },
 618         {
 619                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 620                 .procname       = "printk_ratelimit",
 621                 .data           = &printk_ratelimit_jiffies,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = &proc_dointvec_jiffies,
 625                 .strategy       = &sysctl_jiffies,
 626         },
 627         {
 628                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 629                 .procname       = "printk_ratelimit_burst",
 630                 .data           = &printk_ratelimit_burst,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = &proc_dointvec,
 634         },
 635         {
 636                 .ctl_name       = KERN_NGROUPS_MAX,
 637                 .procname       = "ngroups_max",
 638                 .data           = &ngroups_max,
 639                 .maxlen         = sizeof (int),
 640                 .mode           = 0444,
 641                 .proc_handler   = &proc_dointvec,
 642         },
 643 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 644         {
 645                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 646                 .procname       = "unknown_nmi_panic",
 647                 .data           = &unknown_nmi_panic,
 648                 .maxlen         = sizeof (int),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec,
 651         },
 652         {
 653                 .ctl_name       = KERN_NMI_WATCHDOG,
 654                 .procname       = "nmi_watchdog",
 655                 .data           = &nmi_watchdog_enabled,
 656                 .maxlen         = sizeof (int),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_nmi_enabled,
 659         },
 660 #endif
 661 #if defined(CONFIG_X86)
 662         {
 663                 .ctl_name       = KERN_PANIC_ON_NMI,
 664                 .procname       = "panic_on_unrecovered_nmi",
 665                 .data           = &panic_on_unrecovered_nmi,
 666                 .maxlen         = sizeof(int),
 667                 .mode           = 0644,
 668                 .proc_handler   = &proc_dointvec,
 669         },
 670         {
 671                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 672                 .procname       = "bootloader_type",
 673                 .data           = &bootloader_type,
 674                 .maxlen         = sizeof (int),
 675                 .mode           = 0444,
 676                 .proc_handler   = &proc_dointvec,
 677         },
 678         {
 679                 .ctl_name       = CTL_UNNUMBERED,
 680                 .procname       = "kstack_depth_to_print",
 681                 .data           = &kstack_depth_to_print,
 682                 .maxlen         = sizeof(int),
 683                 .mode           = 0644,
 684                 .proc_handler   = &proc_dointvec,
 685         },
 686 #endif
 687 #if defined(CONFIG_MMU)
 688         {
 689                 .ctl_name       = KERN_RANDOMIZE,
 690                 .procname       = "randomize_va_space",
 691                 .data           = &randomize_va_space,
 692                 .maxlen         = sizeof(int),
 693                 .mode           = 0644,
 694                 .proc_handler   = &proc_dointvec,
 695         },
 696 #endif
 697 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 698         {
 699                 .ctl_name       = KERN_SPIN_RETRY,
 700                 .procname       = "spin_retry",
 701                 .data           = &spin_retry,
 702                 .maxlen         = sizeof (int),
 703                 .mode           = 0644,
 704                 .proc_handler   = &proc_dointvec,
 705         },
 706 #endif
 707 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 708         {
 709                 .ctl_name       = KERN_ACPI_VIDEO_FLAGS,
 710                 .procname       = "acpi_video_flags",
 711                 .data           = &acpi_realmode_flags,
 712                 .maxlen         = sizeof (unsigned long),
 713                 .mode           = 0644,
 714                 .proc_handler   = &proc_doulongvec_minmax,
 715         },
 716 #endif
 717 #ifdef CONFIG_IA64
 718         {
 719                 .ctl_name       = KERN_IA64_UNALIGNED,
 720                 .procname       = "ignore-unaligned-usertrap",
 721                 .data           = &no_unaligned_warning,
 722                 .maxlen         = sizeof (int),
 723                 .mode           = 0644,
 724                 .proc_handler   = &proc_dointvec,
 725         },
 726 #endif
 727 #ifdef CONFIG_DETECT_SOFTLOCKUP
 728         {
 729                 .ctl_name       = CTL_UNNUMBERED,
 730                 .procname       = "softlockup_thresh",
 731                 .data           = &softlockup_thresh,
 732                 .maxlen         = sizeof(int),
 733                 .mode           = 0644,
 734                 .proc_handler   = &proc_dointvec_minmax,
 735                 .strategy       = &sysctl_intvec,
 736                 .extra1         = &one,
 737                 .extra2         = &sixty,
 738         },
 739 #endif
 740 #ifdef CONFIG_COMPAT
 741         {
 742                 .ctl_name       = KERN_COMPAT_LOG,
 743                 .procname       = "compat-log",
 744                 .data           = &compat_log,
 745                 .maxlen         = sizeof (int),
 746                 .mode           = 0644,
 747                 .proc_handler   = &proc_dointvec,
 748         },
 749 #endif
 750 #ifdef CONFIG_RT_MUTEXES
 751         {
 752                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 753                 .procname       = "max_lock_depth",
 754                 .data           = &max_lock_depth,
 755                 .maxlen         = sizeof(int),
 756                 .mode           = 0644,
 757                 .proc_handler   = &proc_dointvec,
 758         },
 759 #endif
 760 #ifdef CONFIG_PROC_FS
 761         {
 762                 .ctl_name       = CTL_UNNUMBERED,
 763                 .procname       = "maps_protect",
 764                 .data           = &maps_protect,
 765                 .maxlen         = sizeof(int),
 766                 .mode           = 0644,
 767                 .proc_handler   = &proc_dointvec,
 768         },
 769 #endif
 770         {
 771                 .ctl_name       = CTL_UNNUMBERED,
 772                 .procname       = "poweroff_cmd",
 773                 .data           = &poweroff_cmd,
 774                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 775                 .mode           = 0644,
 776                 .proc_handler   = &proc_dostring,
 777                 .strategy       = &sysctl_string,
 778         },
 779 /*
 780  * NOTE: do not add new entries to this table unless you have read
 781  * Documentation/sysctl/ctl_unnumbered.txt
 782  */
 783         { .ctl_name = 0 }
 784 };
 785
 786 static ctl_table vm_table[] = {
 787         {
 788                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 789                 .procname       = "overcommit_memory",
 790                 .data           = &sysctl_overcommit_memory,
 791                 .maxlen         = sizeof(sysctl_overcommit_memory),
 792                 .mode           = 0644,
 793                 .proc_handler   = &proc_dointvec,
 794         },
 795         {
 796                 .ctl_name       = VM_PANIC_ON_OOM,
 797                 .procname       = "panic_on_oom",
 798                 .data           = &sysctl_panic_on_oom,
 799                 .maxlen         = sizeof(sysctl_panic_on_oom),
 800                 .mode           = 0644,
 801                 .proc_handler   = &proc_dointvec,
 802         },
 803         {
 804                 .ctl_name       = CTL_UNNUMBERED,
 805                 .procname       = "oom_kill_allocating_task",
 806                 .data           = &sysctl_oom_kill_allocating_task,
 807                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 808                 .mode           = 0644,
 809                 .proc_handler   = &proc_dointvec,
 810         },
 811         {
 812                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 813                 .procname       = "overcommit_ratio",
 814                 .data           = &sysctl_overcommit_ratio,
 815                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 816                 .mode           = 0644,
 817                 .proc_handler   = &proc_dointvec,
 818         },
 819         {
 820                 .ctl_name       = VM_PAGE_CLUSTER,
 821                 .procname       = "page-cluster",
 822                 .data           = &page_cluster,
 823                 .maxlen         = sizeof(int),
 824                 .mode           = 0644,
 825                 .proc_handler   = &proc_dointvec,
 826         },
 827         {
 828                 .ctl_name       = VM_DIRTY_BACKGROUND,
 829                 .procname       = "dirty_background_ratio",
 830                 .data           = &dirty_background_ratio,
 831                 .maxlen         = sizeof(dirty_background_ratio),
 832                 .mode           = 0644,
 833                 .proc_handler   = &proc_dointvec_minmax,
 834                 .strategy       = &sysctl_intvec,
 835                 .extra1         = &zero,
 836                 .extra2         = &one_hundred,
 837         },
 838         {
 839                 .ctl_name       = VM_DIRTY_RATIO,
 840                 .procname       = "dirty_ratio",
 841                 .data           = &vm_dirty_ratio,
 842                 .maxlen         = sizeof(vm_dirty_ratio),
 843                 .mode           = 0644,
 844                 .proc_handler   = &dirty_ratio_handler,
 845                 .strategy       = &sysctl_intvec,
 846                 .extra1         = &zero,
 847                 .extra2         = &one_hundred,
 848         },
 849         {
 850                 .ctl_name       = VM_DIRTY_WB_CS,
 851                 .procname       = "dirty_writeback_centisecs",
 852                 .data           = &dirty_writeback_interval,
 853                 .maxlen         = sizeof(dirty_writeback_interval),
 854                 .mode           = 0644,
 855                 .proc_handler   = &dirty_writeback_centisecs_handler,
 856         },
 857         {
 858                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
 859                 .procname       = "dirty_expire_centisecs",
 860                 .data           = &dirty_expire_interval,
 861                 .maxlen         = sizeof(dirty_expire_interval),
 862                 .mode           = 0644,
 863                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 864         },
 865         {
 866                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 867                 .procname       = "nr_pdflush_threads",
 868                 .data           = &nr_pdflush_threads,
 869                 .maxlen         = sizeof nr_pdflush_threads,
 870                 .mode           = 0444 /* read-only*/,
 871                 .proc_handler   = &proc_dointvec,
 872         },
 873         {
 874                 .ctl_name       = VM_SWAPPINESS,
 875                 .procname       = "swappiness",
 876                 .data           = &vm_swappiness,
 877                 .maxlen         = sizeof(vm_swappiness),
 878                 .mode           = 0644,
 879                 .proc_handler   = &proc_dointvec_minmax,
 880                 .strategy       = &sysctl_intvec,
 881                 .extra1         = &zero,
 882                 .extra2         = &one_hundred,
 883         },
 884 #ifdef CONFIG_HUGETLB_PAGE
 885          {
 886                 .ctl_name       = VM_HUGETLB_PAGES,
 887                 .procname       = "nr_hugepages",
 888                 .data           = &max_huge_pages,
 889                 .maxlen         = sizeof(unsigned long),
 890                 .mode           = 0644,
 891                 .proc_handler   = &hugetlb_sysctl_handler,
 892                 .extra1         = (void *)&hugetlb_zero,
 893                 .extra2         = (void *)&hugetlb_infinity,
 894          },
 895          {
 896                 .ctl_name       = VM_HUGETLB_GROUP,
 897                 .procname       = "hugetlb_shm_group",
 898                 .data           = &sysctl_hugetlb_shm_group,
 899                 .maxlen         = sizeof(gid_t),
 900                 .mode           = 0644,
 901                 .proc_handler   = &proc_dointvec,
 902          },
 903          {
 904                 .ctl_name       = CTL_UNNUMBERED,
 905                 .procname       = "hugepages_treat_as_movable",
 906                 .data           = &hugepages_treat_as_movable,
 907                 .maxlen         = sizeof(int),
 908                 .mode           = 0644,
 909                 .proc_handler   = &hugetlb_treat_movable_handler,
 910         },
 911         {
 912                 .ctl_name       = CTL_UNNUMBERED,
 913                 .procname       = "hugetlb_dynamic_pool",
 914                 .data           = &hugetlb_dynamic_pool,
 915                 .maxlen         = sizeof(hugetlb_dynamic_pool),
 916                 .mode           = 0644,
 917                 .proc_handler   = &proc_dointvec,
 918         },
 919 #endif
 920         {
 921                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 922                 .procname       = "lowmem_reserve_ratio",
 923                 .data           = &sysctl_lowmem_reserve_ratio,
 924                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 925                 .mode           = 0644,
 926                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 927                 .strategy       = &sysctl_intvec,
 928         },
 929         {
 930                 .ctl_name       = VM_DROP_PAGECACHE,
 931                 .procname       = "drop_caches",
 932                 .data           = &sysctl_drop_caches,
 933                 .maxlen         = sizeof(int),
 934                 .mode           = 0644,
 935                 .proc_handler   = drop_caches_sysctl_handler,
 936                 .strategy       = &sysctl_intvec,
 937         },
 938         {
 939                 .ctl_name       = VM_MIN_FREE_KBYTES,
 940                 .procname       = "min_free_kbytes",
 941                 .data           = &min_free_kbytes,
 942                 .maxlen         = sizeof(min_free_kbytes),
 943                 .mode           = 0644,
 944                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 945                 .strategy       = &sysctl_intvec,
 946                 .extra1         = &zero,
 947         },
 948         {
 949                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 950                 .procname       = "percpu_pagelist_fraction",
 951                 .data           = &percpu_pagelist_fraction,
 952                 .maxlen         = sizeof(percpu_pagelist_fraction),
 953                 .mode           = 0644,
 954                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 955                 .strategy       = &sysctl_intvec,
 956                 .extra1         = &min_percpu_pagelist_fract,
 957         },
 958 #ifdef CONFIG_MMU
 959         {
 960                 .ctl_name       = VM_MAX_MAP_COUNT,
 961                 .procname       = "max_map_count",
 962                 .data           = &sysctl_max_map_count,
 963                 .maxlen         = sizeof(sysctl_max_map_count),
 964                 .mode           = 0644,
 965                 .proc_handler   = &proc_dointvec
 966         },
 967 #endif
 968         {
 969                 .ctl_name       = VM_LAPTOP_MODE,
 970                 .procname       = "laptop_mode",
 971                 .data           = &laptop_mode,
 972                 .maxlen         = sizeof(laptop_mode),
 973                 .mode           = 0644,
 974                 .proc_handler   = &proc_dointvec_jiffies,
 975                 .strategy       = &sysctl_jiffies,
 976         },
 977         {
 978                 .ctl_name       = VM_BLOCK_DUMP,
 979                 .procname       = "block_dump",
 980                 .data           = &block_dump,
 981                 .maxlen         = sizeof(block_dump),
 982                 .mode           = 0644,
 983                 .proc_handler   = &proc_dointvec,
 984                 .strategy       = &sysctl_intvec,
 985                 .extra1         = &zero,
 986         },
 987         {
 988                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 989                 .procname       = "vfs_cache_pressure",
 990                 .data           = &sysctl_vfs_cache_pressure,
 991                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 992                 .mode           = 0644,
 993                 .proc_handler   = &proc_dointvec,
 994                 .strategy       = &sysctl_intvec,
 995                 .extra1         = &zero,
 996         },
 997 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 998         {
 999                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1000                 .procname       = "legacy_va_layout",
1001                 .data           = &sysctl_legacy_va_layout,
1002                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1003                 .mode           = 0644,
1004                 .proc_handler   = &proc_dointvec,
1005                 .strategy       = &sysctl_intvec,
1006                 .extra1         = &zero,
1007         },
1008 #endif
1009 #ifdef CONFIG_NUMA
1010         {
1011                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1012                 .procname       = "zone_reclaim_mode",
1013                 .data           = &zone_reclaim_mode,
1014                 .maxlen         = sizeof(zone_reclaim_mode),
1015                 .mode           = 0644,
1016                 .proc_handler   = &proc_dointvec,
1017                 .strategy       = &sysctl_intvec,
1018                 .extra1         = &zero,
1019         },
1020         {
1021                 .ctl_name       = VM_MIN_UNMAPPED,
1022                 .procname       = "min_unmapped_ratio",
1023                 .data           = &sysctl_min_unmapped_ratio,
1024                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1025                 .mode           = 0644,
1026                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1027                 .strategy       = &sysctl_intvec,
1028                 .extra1         = &zero,
1029                 .extra2         = &one_hundred,
1030         },
1031         {
1032                 .ctl_name       = VM_MIN_SLAB,
1033                 .procname       = "min_slab_ratio",
1034                 .data           = &sysctl_min_slab_ratio,
1035                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1036                 .mode           = 0644,
1037                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1038                 .strategy       = &sysctl_intvec,
1039                 .extra1         = &zero,
1040                 .extra2         = &one_hundred,
1041         },
1042 #endif
1043 #ifdef CONFIG_SMP
1044         {
1045                 .ctl_name       = CTL_UNNUMBERED,
1046                 .procname       = "stat_interval",
1047                 .data           = &sysctl_stat_interval,
1048                 .maxlen         = sizeof(sysctl_stat_interval),
1049                 .mode           = 0644,
1050                 .proc_handler   = &proc_dointvec_jiffies,
1051                 .strategy       = &sysctl_jiffies,
1052         },
1053 #endif
1054 #ifdef CONFIG_SECURITY
1055         {
1056                 .ctl_name       = CTL_UNNUMBERED,
1057                 .procname       = "mmap_min_addr",
1058                 .data           = &mmap_min_addr,
1059                 .maxlen         = sizeof(unsigned long),
1060                 .mode           = 0644,
1061                 .proc_handler   = &proc_doulongvec_minmax,
1062         },
1063 #endif
1064 #ifdef CONFIG_NUMA
1065         {
1066                 .ctl_name       = CTL_UNNUMBERED,
1067                 .procname       = "numa_zonelist_order",
1068                 .data           = &numa_zonelist_order,
1069                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1070                 .mode           = 0644,
1071                 .proc_handler   = &numa_zonelist_order_handler,
1072                 .strategy       = &sysctl_string,
1073         },
1074 #endif
1075 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1076    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1077         {
1078                 .ctl_name       = VM_VDSO_ENABLED,
1079                 .procname       = "vdso_enabled",
1080                 .data           = &vdso_enabled,
1081                 .maxlen         = sizeof(vdso_enabled),
1082                 .mode           = 0644,
1083                 .proc_handler   = &proc_dointvec,
1084                 .strategy       = &sysctl_intvec,
1085                 .extra1         = &zero,
1086         },
1087 #endif
1088 /*
1089  * NOTE: do not add new entries to this table unless you have read
1090  * Documentation/sysctl/ctl_unnumbered.txt
1091  */
1092         { .ctl_name = 0 }
1093 };
1094
1095 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1096 static ctl_table binfmt_misc_table[] = {
1097         { .ctl_name = 0 }
1098 };
1099 #endif
1100
1101 static ctl_table fs_table[] = {
1102         {
1103                 .ctl_name       = FS_NRINODE,
1104                 .procname       = "inode-nr",
1105                 .data           = &inodes_stat,
1106                 .maxlen         = 2*sizeof(int),
1107                 .mode           = 0444,
1108                 .proc_handler   = &proc_dointvec,
1109         },
1110         {
1111                 .ctl_name       = FS_STATINODE,
1112                 .procname       = "inode-state",
1113                 .data           = &inodes_stat,
1114                 .maxlen         = 7*sizeof(int),
1115                 .mode           = 0444,
1116                 .proc_handler   = &proc_dointvec,
1117         },
1118         {
1119                 .ctl_name       = FS_NRFILE,
1120                 .procname       = "file-nr",
1121                 .data           = &files_stat,
1122                 .maxlen         = 3*sizeof(int),
1123                 .mode           = 0444,
1124                 .proc_handler   = &proc_nr_files,
1125         },
1126         {
1127                 .ctl_name       = FS_MAXFILE,
1128                 .procname       = "file-max",
1129                 .data           = &files_stat.max_files,
1130                 .maxlen         = sizeof(int),
1131                 .mode           = 0644,
1132                 .proc_handler   = &proc_dointvec,
1133         },
1134         {
1135                 .ctl_name       = FS_DENTRY,
1136                 .procname       = "dentry-state",
1137                 .data           = &dentry_stat,
1138                 .maxlen         = 6*sizeof(int),
1139                 .mode           = 0444,
1140                 .proc_handler   = &proc_dointvec,
1141         },
1142         {
1143                 .ctl_name       = FS_OVERFLOWUID,
1144                 .procname       = "overflowuid",
1145                 .data           = &fs_overflowuid,
1146                 .maxlen         = sizeof(int),
1147                 .mode           = 0644,
1148                 .proc_handler   = &proc_dointvec_minmax,
1149                 .strategy       = &sysctl_intvec,
1150                 .extra1         = &minolduid,
1151                 .extra2         = &maxolduid,
1152         },
1153         {
1154                 .ctl_name       = FS_OVERFLOWGID,
1155                 .procname       = "overflowgid",
1156                 .data           = &fs_overflowgid,
1157                 .maxlen         = sizeof(int),
1158                 .mode           = 0644,
1159                 .proc_handler   = &proc_dointvec_minmax,
1160                 .strategy       = &sysctl_intvec,
1161                 .extra1         = &minolduid,
1162                 .extra2         = &maxolduid,
1163         },
1164         {
1165                 .ctl_name       = FS_LEASES,
1166                 .procname       = "leases-enable",
1167                 .data           = &leases_enable,
1168                 .maxlen         = sizeof(int),
1169                 .mode           = 0644,
1170                 .proc_handler   = &proc_dointvec,
1171         },
1172 #ifdef CONFIG_DNOTIFY
1173         {
1174                 .ctl_name       = FS_DIR_NOTIFY,
1175                 .procname       = "dir-notify-enable",
1176                 .data           = &dir_notify_enable,
1177                 .maxlen         = sizeof(int),
1178                 .mode           = 0644,
1179                 .proc_handler   = &proc_dointvec,
1180         },
1181 #endif
1182 #ifdef CONFIG_MMU
1183         {
1184                 .ctl_name       = FS_LEASE_TIME,
1185                 .procname       = "lease-break-time",
1186                 .data           = &lease_break_time,
1187                 .maxlen         = sizeof(int),
1188                 .mode           = 0644,
1189                 .proc_handler   = &proc_dointvec_minmax,
1190                 .strategy       = &sysctl_intvec,
1191                 .extra1         = &zero,
1192                 .extra2         = &two,
1193         },
1194         {
1195                 .ctl_name       = FS_AIO_NR,
1196                 .procname       = "aio-nr",
1197                 .data           = &aio_nr,
1198                 .maxlen         = sizeof(aio_nr),
1199                 .mode           = 0444,
1200                 .proc_handler   = &proc_doulongvec_minmax,
1201         },
1202         {
1203                 .ctl_name       = FS_AIO_MAX_NR,
1204                 .procname       = "aio-max-nr",
1205                 .data           = &aio_max_nr,
1206                 .maxlen         = sizeof(aio_max_nr),
1207                 .mode           = 0644,
1208                 .proc_handler   = &proc_doulongvec_minmax,
1209         },
1210 #ifdef CONFIG_INOTIFY_USER
1211         {
1212                 .ctl_name       = FS_INOTIFY,
1213                 .procname       = "inotify",
1214                 .mode           = 0555,
1215                 .child          = inotify_table,
1216         },
1217 #endif
1218 #endif
1219         {
1220                 .ctl_name       = KERN_SETUID_DUMPABLE,
1221                 .procname       = "suid_dumpable",
1222                 .data           = &suid_dumpable,
1223                 .maxlen         = sizeof(int),
1224                 .mode           = 0644,
1225                 .proc_handler   = &proc_dointvec,
1226         },
1227 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1228         {
1229                 .ctl_name       = CTL_UNNUMBERED,
1230                 .procname       = "binfmt_misc",
1231                 .mode           = 0555,
1232                 .child          = binfmt_misc_table,
1233         },
1234 #endif
1235 /*
1236  * NOTE: do not add new entries to this table unless you have read
1237  * Documentation/sysctl/ctl_unnumbered.txt
1238  */
1239         { .ctl_name = 0 }
1240 };
1241
1242 static ctl_table debug_table[] = {
1243 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1244         {
1245                 .ctl_name       = CTL_UNNUMBERED,
1246                 .procname       = "exception-trace",
1247                 .data           = &show_unhandled_signals,
1248                 .maxlen         = sizeof(int),
1249                 .mode           = 0644,
1250                 .proc_handler   = proc_dointvec
1251         },
1252 #endif
1253         { .ctl_name = 0 }
1254 };
1255
1256 static ctl_table dev_table[] = {
1257         { .ctl_name = 0 }
1258 };
1259
1260 static DEFINE_SPINLOCK(sysctl_lock);
1261
1262 /* called under sysctl_lock */
1263 static int use_table(struct ctl_table_header *p)
1264 {
1265         if (unlikely(p->unregistering))
1266                 return 0;
1267         p->used++;
1268         return 1;
1269 }
1270
1271 /* called under sysctl_lock */
1272 static void unuse_table(struct ctl_table_header *p)
1273 {
1274         if (!--p->used)
1275                 if (unlikely(p->unregistering))
1276                         complete(p->unregistering);
1277 }
1278
1279 /* called under sysctl_lock, will reacquire if has to wait */
1280 static void start_unregistering(struct ctl_table_header *p)
1281 {
1282         /*
1283          * if p->used is 0, nobody will ever touch that entry again;
1284          * we'll eliminate all paths to it before dropping sysctl_lock
1285          */
1286         if (unlikely(p->used)) {
1287                 struct completion wait;
1288                 init_completion(&wait);
1289                 p->unregistering = &wait;
1290                 spin_unlock(&sysctl_lock);
1291                 wait_for_completion(&wait);
1292                 spin_lock(&sysctl_lock);
1293         }
1294         /*
1295          * do not remove from the list until nobody holds it; walking the
1296          * list in do_sysctl() relies on that.
1297          */
1298         list_del_init(&p->ctl_entry);
1299 }
1300
1301 void sysctl_head_finish(struct ctl_table_header *head)
1302 {
1303         if (!head)
1304                 return;
1305         spin_lock(&sysctl_lock);
1306         unuse_table(head);
1307         spin_unlock(&sysctl_lock);
1308 }
1309
1310 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1311 {
1312         struct ctl_table_header *head;
1313         struct list_head *tmp;
1314         spin_lock(&sysctl_lock);
1315         if (prev) {
1316                 tmp = &prev->ctl_entry;
1317                 unuse_table(prev);
1318                 goto next;
1319         }
1320         tmp = &root_table_header.ctl_entry;
1321         for (;;) {
1322                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1323
1324                 if (!use_table(head))
1325                         goto next;
1326                 spin_unlock(&sysctl_lock);
1327                 return head;
1328         next:
1329                 tmp = tmp->next;
1330                 if (tmp == &root_table_header.ctl_entry)
1331                         break;
1332         }
1333         spin_unlock(&sysctl_lock);
1334         return NULL;
1335 }
1336
1337 #ifdef CONFIG_SYSCTL_SYSCALL
1338 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1339                void __user *newval, size_t newlen)
1340 {
1341         struct ctl_table_header *head;
1342         int error = -ENOTDIR;
1343
1344         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1345                 return -ENOTDIR;
1346         if (oldval) {
1347                 int old_len;
1348                 if (!oldlenp || get_user(old_len, oldlenp))
1349                         return -EFAULT;
1350         }
1351
1352         for (head = sysctl_head_next(NULL); head;
1353                         head = sysctl_head_next(head)) {
1354                 error = parse_table(name, nlen, oldval, oldlenp,
1355                                         newval, newlen, head->ctl_table);
1356                 if (error != -ENOTDIR) {
1357                         sysctl_head_finish(head);
1358                         break;
1359                 }
1360         }
1361         return error;
1362 }
1363
1364 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1365 {
1366         struct __sysctl_args tmp;
1367         int error;
1368
1369         if (copy_from_user(&tmp, args, sizeof(tmp)))
1370                 return -EFAULT;
1371
1372         lock_kernel();
1373         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1374                           tmp.newval, tmp.newlen);
1375         unlock_kernel();
1376         return error;
1377 }
1378 #endif /* CONFIG_SYSCTL_SYSCALL */
1379
1380 /*
1381  * sysctl_perm does NOT grant the superuser all rights automatically, because
1382  * some sysctl variables are readonly even to root.
1383  */
1384
1385 static int test_perm(int mode, int op)
1386 {
1387         if (!current->euid)
1388                 mode >>= 6;
1389         else if (in_egroup_p(0))
1390                 mode >>= 3;
1391         if ((mode & op & 0007) == op)
1392                 return 0;
1393         return -EACCES;
1394 }
1395
1396 int sysctl_perm(ctl_table *table, int op)
1397 {
1398         int error;
1399         error = security_sysctl(table, op);
1400         if (error)
1401                 return error;
1402         return test_perm(table->mode, op);
1403 }
1404
1405 #ifdef CONFIG_SYSCTL_SYSCALL
1406 static int parse_table(int __user *name, int nlen,
1407                        void __user *oldval, size_t __user *oldlenp,
1408                        void __user *newval, size_t newlen,
1409                        ctl_table *table)
1410 {
1411         int n;
1412 repeat:
1413         if (!nlen)
1414                 return -ENOTDIR;
1415         if (get_user(n, name))
1416                 return -EFAULT;
1417         for ( ; table->ctl_name || table->procname; table++) {
1418                 if (!table->ctl_name)
1419                         continue;
1420                 if (n == table->ctl_name) {
1421                         int error;
1422                         if (table->child) {
1423                                 if (sysctl_perm(table, 001))
1424                                         return -EPERM;
1425                                 name++;
1426                                 nlen--;
1427                                 table = table->child;
1428                                 goto repeat;
1429                         }
1430                         error = do_sysctl_strategy(table, name, nlen,
1431                                                    oldval, oldlenp,
1432                                                    newval, newlen);
1433                         return error;
1434                 }
1435         }
1436         return -ENOTDIR;
1437 }
1438
1439 /* Perform the actual read/write of a sysctl table entry. */
1440 int do_sysctl_strategy (ctl_table *table,
1441                         int __user *name, int nlen,
1442                         void __user *oldval, size_t __user *oldlenp,
1443                         void __user *newval, size_t newlen)
1444 {
1445         int op = 0, rc;
1446         size_t len;
1447
1448         if (oldval)
1449                 op |= 004;
1450         if (newval)
1451                 op |= 002;
1452         if (sysctl_perm(table, op))
1453                 return -EPERM;
1454
1455         if (table->strategy) {
1456                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1457                                      newval, newlen);
1458                 if (rc < 0)
1459                         return rc;
1460                 if (rc > 0)
1461                         return 0;
1462         }
1463
1464         /* If there is no strategy routine, or if the strategy returns
1465          * zero, proceed with automatic r/w */
1466         if (table->data && table->maxlen) {
1467                 if (oldval && oldlenp) {
1468                         if (get_user(len, oldlenp))
1469                                 return -EFAULT;
1470                         if (len) {
1471                                 if (len > table->maxlen)
1472                                         len = table->maxlen;
1473                                 if(copy_to_user(oldval, table->data, len))
1474                                         return -EFAULT;
1475                                 if(put_user(len, oldlenp))
1476                                         return -EFAULT;
1477                         }
1478                 }
1479                 if (newval && newlen) {
1480                         len = newlen;
1481                         if (len > table->maxlen)
1482                                 len = table->maxlen;
1483                         if(copy_from_user(table->data, newval, len))
1484                                 return -EFAULT;
1485                 }
1486         }
1487         return 0;
1488 }
1489 #endif /* CONFIG_SYSCTL_SYSCALL */
1490
1491 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1492 {
1493         for (; table->ctl_name || table->procname; table++) {
1494                 table->parent = parent;
1495                 if (table->child)
1496                         sysctl_set_parent(table, table->child);
1497         }
1498 }
1499
1500 static __init int sysctl_init(void)
1501 {
1502         sysctl_set_parent(NULL, root_table);
1503         return 0;
1504 }
1505
1506 core_initcall(sysctl_init);
1507
1508 /**
1509  * register_sysctl_table - register a sysctl hierarchy
1510  * @table: the top-level table structure
1511  *
1512  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1513  * array. An entry with a ctl_name of 0 terminates the table.
1514  *
1515  * The members of the &ctl_table structure are used as follows:
1516  *
1517  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1518  *            must be unique within that level of sysctl
1519  *
1520  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1521  *            enter a sysctl file
1522  *
1523  * data - a pointer to data for use by proc_handler
1524  *
1525  * maxlen - the maximum size in bytes of the data
1526  *
1527  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1528  *
1529  * child - a pointer to the child sysctl table if this entry is a directory, or
1530  *         %NULL.
1531  *
1532  * proc_handler - the text handler routine (described below)
1533  *
1534  * strategy - the strategy routine (described below)
1535  *
1536  * de - for internal use by the sysctl routines
1537  *
1538  * extra1, extra2 - extra pointers usable by the proc handler routines
1539  *
1540  * Leaf nodes in the sysctl tree will be represented by a single file
1541  * under /proc; non-leaf nodes will be represented by directories.
1542  *
1543  * sysctl(2) can automatically manage read and write requests through
1544  * the sysctl table.  The data and maxlen fields of the ctl_table
1545  * struct enable minimal validation of the values being written to be
1546  * performed, and the mode field allows minimal authentication.
1547  *
1548  * More sophisticated management can be enabled by the provision of a
1549  * strategy routine with the table entry.  This will be called before
1550  * any automatic read or write of the data is performed.
1551  *
1552  * The strategy routine may return
1553  *
1554  * < 0 - Error occurred (error is passed to user process)
1555  *
1556  * 0   - OK - proceed with automatic read or write.
1557  *
1558  * > 0 - OK - read or write has been done by the strategy routine, so
1559  *       return immediately.
1560  *
1561  * There must be a proc_handler routine for any terminal nodes
1562  * mirrored under /proc/sys (non-terminals are handled by a built-in
1563  * directory handler).  Several default handlers are available to
1564  * cover common cases -
1565  *
1566  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1567  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1568  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1569  *
1570  * It is the handler's job to read the input buffer from user memory
1571  * and process it. The handler should return 0 on success.
1572  *
1573  * This routine returns %NULL on a failure to register, and a pointer
1574  * to the table header on success.
1575  */
1576 struct ctl_table_header *register_sysctl_table(ctl_table * table)
1577 {
1578         struct ctl_table_header *tmp;
1579         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1580         if (!tmp)
1581                 return NULL;
1582         tmp->ctl_table = table;
1583         INIT_LIST_HEAD(&tmp->ctl_entry);
1584         tmp->used = 0;
1585         tmp->unregistering = NULL;
1586         sysctl_set_parent(NULL, table);
1587         spin_lock(&sysctl_lock);
1588         list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1589         spin_unlock(&sysctl_lock);
1590         return tmp;
1591 }
1592
1593 /**
1594  * unregister_sysctl_table - unregister a sysctl table hierarchy
1595  * @header: the header returned from register_sysctl_table
1596  *
1597  * Unregisters the sysctl table and all children. proc entries may not
1598  * actually be removed until they are no longer used by anyone.
1599  */
1600 void unregister_sysctl_table(struct ctl_table_header * header)
1601 {
1602         might_sleep();
1603         spin_lock(&sysctl_lock);
1604         start_unregistering(header);
1605         spin_unlock(&sysctl_lock);
1606         kfree(header);
1607 }
1608
1609 #else /* !CONFIG_SYSCTL */
1610 struct ctl_table_header *register_sysctl_table(ctl_table * table)
1611 {
1612         return NULL;
1613 }
1614
1615 void unregister_sysctl_table(struct ctl_table_header * table)
1616 {
1617 }
1618
1619 #endif /* CONFIG_SYSCTL */
1620
1621 /*
1622  * /proc/sys support
1623  */
1624
1625 #ifdef CONFIG_PROC_SYSCTL
1626
1627 static int _proc_do_string(void* data, int maxlen, int write,
1628                            struct file *filp, void __user *buffer,
1629                            size_t *lenp, loff_t *ppos)
1630 {
1631         size_t len;
1632         char __user *p;
1633         char c;
1634
1635         if (!data || !maxlen || !*lenp) {
1636                 *lenp = 0;
1637                 return 0;
1638         }
1639
1640         if (write) {
1641                 len = 0;
1642                 p = buffer;
1643                 while (len < *lenp) {
1644                         if (get_user(c, p++))
1645                                 return -EFAULT;
1646                         if (c == 0 || c == '\n')
1647                                 break;
1648                         len++;
1649                 }
1650                 if (len >= maxlen)
1651                         len = maxlen-1;
1652                 if(copy_from_user(data, buffer, len))
1653                         return -EFAULT;
1654                 ((char *) data)[len] = 0;
1655                 *ppos += *lenp;
1656         } else {
1657                 len = strlen(data);
1658                 if (len > maxlen)
1659                         len = maxlen;
1660
1661                 if (*ppos > len) {
1662                         *lenp = 0;
1663                         return 0;
1664                 }
1665
1666                 data += *ppos;
1667                 len  -= *ppos;
1668
1669                 if (len > *lenp)
1670                         len = *lenp;
1671                 if (len)
1672                         if(copy_to_user(buffer, data, len))
1673                                 return -EFAULT;
1674                 if (len < *lenp) {
1675                         if(put_user('\n', ((char __user *) buffer) + len))
1676                                 return -EFAULT;
1677                         len++;
1678                 }
1679                 *lenp = len;
1680                 *ppos += len;
1681         }
1682         return 0;
1683 }
1684
1685 /**
1686  * proc_dostring - read a string sysctl
1687  * @table: the sysctl table
1688  * @write: %TRUE if this is a write to the sysctl file
1689  * @filp: the file structure
1690  * @buffer: the user buffer
1691  * @lenp: the size of the user buffer
1692  * @ppos: file position
1693  *
1694  * Reads/writes a string from/to the user buffer. If the kernel
1695  * buffer provided is not large enough to hold the string, the
1696  * string is truncated. The copied string is %NULL-terminated.
1697  * If the string is being read by the user process, it is copied
1698  * and a newline '\n' is added. It is truncated if the buffer is
1699  * not large enough.
1700  *
1701  * Returns 0 on success.
1702  */
1703 int proc_dostring(ctl_table *table, int write, struct file *filp,
1704                   void __user *buffer, size_t *lenp, loff_t *ppos)
1705 {
1706         return _proc_do_string(table->data, table->maxlen, write, filp,
1707                                buffer, lenp, ppos);
1708 }
1709
1710
1711 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1712                                  int *valp,
1713                                  int write, void *data)
1714 {
1715         if (write) {
1716                 *valp = *negp ? -*lvalp : *lvalp;
1717         } else {
1718                 int val = *valp;
1719                 if (val < 0) {
1720                         *negp = -1;
1721                         *lvalp = (unsigned long)-val;
1722                 } else {
1723                         *negp = 0;
1724                         *lvalp = (unsigned long)val;
1725                 }
1726         }
1727         return 0;
1728 }
1729
1730 static int __do_proc_dointvec(void *tbl_data, ctl_table *table,
1731                   int write, struct file *filp, void __user *buffer,
1732                   size_t *lenp, loff_t *ppos,
1733                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1734                               int write, void *data),
1735                   void *data)
1736 {
1737 #define TMPBUFLEN 21
1738         int *i, vleft, first=1, neg, val;
1739         unsigned long lval;
1740         size_t left, len;
1741
1742         char buf[TMPBUFLEN], *p;
1743         char __user *s = buffer;
1744
1745         if (!tbl_data || !table->maxlen || !*lenp ||
1746             (*ppos && !write)) {
1747                 *lenp = 0;
1748                 return 0;
1749         }
1750
1751         i = (int *) tbl_data;
1752         vleft = table->maxlen / sizeof(*i);
1753         left = *lenp;
1754
1755         if (!conv)
1756                 conv = do_proc_dointvec_conv;
1757
1758         for (; left && vleft--; i++, first=0) {
1759                 if (write) {
1760                         while (left) {
1761                                 char c;
1762                                 if (get_user(c, s))
1763                                         return -EFAULT;
1764                                 if (!isspace(c))
1765                                         break;
1766                                 left--;
1767                                 s++;
1768                         }
1769                         if (!left)
1770                                 break;
1771                         neg = 0;
1772                         len = left;
1773                         if (len > sizeof(buf) - 1)
1774                                 len = sizeof(buf) - 1;
1775                         if (copy_from_user(buf, s, len))
1776                                 return -EFAULT;
1777                         buf[len] = 0;
1778                         p = buf;
1779                         if (*p == '-' && left > 1) {
1780                                 neg = 1;
1781                                 p++;
1782                         }
1783                         if (*p < '0' || *p > '9')
1784                                 break;
1785
1786                         lval = simple_strtoul(p, &p, 0);
1787
1788                         len = p-buf;
1789                         if ((len < left) && *p && !isspace(*p))
1790                                 break;
1791                         if (neg)
1792                                 val = -val;
1793                         s += len;
1794                         left -= len;
1795
1796                         if (conv(&neg, &lval, i, 1, data))
1797                                 break;
1798                 } else {
1799                         p = buf;
1800                         if (!first)
1801                                 *p++ = '\t';
1802
1803                         if (conv(&neg, &lval, i, 0, data))
1804                                 break;
1805
1806                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1807                         len = strlen(buf);
1808                         if (len > left)
1809                                 len = left;
1810                         if(copy_to_user(s, buf, len))
1811                                 return -EFAULT;
1812                         left -= len;
1813                         s += len;
1814                 }
1815         }
1816
1817         if (!write && !first && left) {
1818                 if(put_user('\n', s))
1819                         return -EFAULT;
1820                 left--, s++;
1821         }
1822         if (write) {
1823                 while (left) {
1824                         char c;
1825                         if (get_user(c, s++))
1826                                 return -EFAULT;
1827                         if (!isspace(c))
1828                                 break;
1829                         left--;
1830                 }
1831         }
1832         if (write && first)
1833                 return -EINVAL;
1834         *lenp -= left;
1835         *ppos += *lenp;
1836         return 0;
1837 #undef TMPBUFLEN
1838 }
1839
1840 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1841                   void __user *buffer, size_t *lenp, loff_t *ppos,
1842                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1843                               int write, void *data),
1844                   void *data)
1845 {
1846         return __do_proc_dointvec(table->data, table, write, filp,
1847                         buffer, lenp, ppos, conv, data);
1848 }
1849
1850 /**
1851  * proc_dointvec - read a vector of integers
1852  * @table: the sysctl table
1853  * @write: %TRUE if this is a write to the sysctl file
1854  * @filp: the file structure
1855  * @buffer: the user buffer
1856  * @lenp: the size of the user buffer
1857  * @ppos: file position
1858  *
1859  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1860  * values from/to the user buffer, treated as an ASCII string.
1861  *
1862  * Returns 0 on success.
1863  */
1864 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1865                      void __user *buffer, size_t *lenp, loff_t *ppos)
1866 {
1867     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1868                             NULL,NULL);
1869 }
1870
1871 #define OP_SET  0
1872 #define OP_AND  1
1873 #define OP_OR   2
1874
1875 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1876                                       int *valp,
1877                                       int write, void *data)
1878 {
1879         int op = *(int *)data;
1880         if (write) {
1881                 int val = *negp ? -*lvalp : *lvalp;
1882                 switch(op) {
1883                 case OP_SET:    *valp = val; break;
1884                 case OP_AND:    *valp &= val; break;
1885                 case OP_OR:     *valp |= val; break;
1886                 }
1887         } else {
1888                 int val = *valp;
1889                 if (val < 0) {
1890                         *negp = -1;
1891                         *lvalp = (unsigned long)-val;
1892                 } else {
1893                         *negp = 0;
1894                         *lvalp = (unsigned long)val;
1895                 }
1896         }
1897         return 0;
1898 }
1899
1900 /*
1901  *      init may raise the set.
1902  */
1903
1904 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1905                         void __user *buffer, size_t *lenp, loff_t *ppos)
1906 {
1907         int op;
1908
1909         if (write && !capable(CAP_SYS_MODULE)) {
1910                 return -EPERM;
1911         }
1912
1913         op = is_init(current) ? OP_SET : OP_AND;
1914         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1915                                 do_proc_dointvec_bset_conv,&op);
1916 }
1917
1918 /*
1919  *      Taint values can only be increased
1920  */
1921 static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp,
1922                                void __user *buffer, size_t *lenp, loff_t *ppos)
1923 {
1924         int op;
1925
1926         if (write && !capable(CAP_SYS_ADMIN))
1927                 return -EPERM;
1928
1929         op = OP_OR;
1930         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1931                                 do_proc_dointvec_bset_conv,&op);
1932 }
1933
1934 struct do_proc_dointvec_minmax_conv_param {
1935         int *min;
1936         int *max;
1937 };
1938
1939 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1940                                         int *valp,
1941                                         int write, void *data)
1942 {
1943         struct do_proc_dointvec_minmax_conv_param *param = data;
1944         if (write) {
1945                 int val = *negp ? -*lvalp : *lvalp;
1946                 if ((param->min && *param->min > val) ||
1947                     (param->max && *param->max < val))
1948                         return -EINVAL;
1949                 *valp = val;
1950         } else {
1951                 int val = *valp;
1952                 if (val < 0) {
1953                         *negp = -1;
1954                         *lvalp = (unsigned long)-val;
1955                 } else {
1956                         *negp = 0;
1957                         *lvalp = (unsigned long)val;
1958                 }
1959         }
1960         return 0;
1961 }
1962
1963 /**
1964  * proc_dointvec_minmax - read a vector of integers with min/max values
1965  * @table: the sysctl table
1966  * @write: %TRUE if this is a write to the sysctl file
1967  * @filp: the file structure
1968  * @buffer: the user buffer
1969  * @lenp: the size of the user buffer
1970  * @ppos: file position
1971  *
1972  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1973  * values from/to the user buffer, treated as an ASCII string.
1974  *
1975  * This routine will ensure the values are within the range specified by
1976  * table->extra1 (min) and table->extra2 (max).
1977  *
1978  * Returns 0 on success.
1979  */
1980 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1981                   void __user *buffer, size_t *lenp, loff_t *ppos)
1982 {
1983         struct do_proc_dointvec_minmax_conv_param param = {
1984                 .min = (int *) table->extra1,
1985                 .max = (int *) table->extra2,
1986         };
1987         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1988                                 do_proc_dointvec_minmax_conv, &param);
1989 }
1990
1991 static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write,
1992                                      struct file *filp,
1993                                      void __user *buffer,
1994                                      size_t *lenp, loff_t *ppos,
1995                                      unsigned long convmul,
1996                                      unsigned long convdiv)
1997 {
1998 #define TMPBUFLEN 21
1999         unsigned long *i, *min, *max, val;
2000         int vleft, first=1, neg;
2001         size_t len, left;
2002         char buf[TMPBUFLEN], *p;
2003         char __user *s = buffer;
2004
2005         if (!data || !table->maxlen || !*lenp ||
2006             (*ppos && !write)) {
2007                 *lenp = 0;
2008                 return 0;
2009         }
2010
2011         i = (unsigned long *) data;
2012         min = (unsigned long *) table->extra1;
2013         max = (unsigned long *) table->extra2;
2014         vleft = table->maxlen / sizeof(unsigned long);
2015         left = *lenp;
2016
2017         for (; left && vleft--; i++, min++, max++, first=0) {
2018                 if (write) {
2019                         while (left) {
2020                                 char c;
2021                                 if (get_user(c, s))
2022                                         return -EFAULT;
2023                                 if (!isspace(c))
2024                                         break;
2025                                 left--;
2026                                 s++;
2027                         }
2028                         if (!left)
2029                                 break;
2030                         neg = 0;
2031                         len = left;
2032                         if (len > TMPBUFLEN-1)
2033                                 len = TMPBUFLEN-1;
2034                         if (copy_from_user(buf, s, len))
2035                                 return -EFAULT;
2036                         buf[len] = 0;
2037                         p = buf;
2038                         if (*p == '-' && left > 1) {
2039                                 neg = 1;
2040                                 p++;
2041                         }
2042                         if (*p < '0' || *p > '9')
2043                                 break;
2044                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2045                         len = p-buf;
2046                         if ((len < left) && *p && !isspace(*p))
2047                                 break;
2048                         if (neg)
2049                                 val = -val;
2050                         s += len;
2051                         left -= len;
2052
2053                         if(neg)
2054                                 continue;
2055                         if ((min && val < *min) || (max && val > *max))
2056                                 continue;
2057                         *i = val;
2058                 } else {
2059                         p = buf;
2060                         if (!first)
2061                                 *p++ = '\t';
2062                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2063                         len = strlen(buf);
2064                         if (len > left)
2065                                 len = left;
2066                         if(copy_to_user(s, buf, len))
2067                                 return -EFAULT;
2068                         left -= len;
2069                         s += len;
2070                 }
2071         }
2072
2073         if (!write && !first && left) {
2074                 if(put_user('\n', s))
2075                         return -EFAULT;
2076                 left--, s++;
2077         }
2078         if (write) {
2079                 while (left) {
2080                         char c;
2081                         if (get_user(c, s++))
2082                                 return -EFAULT;
2083                         if (!isspace(c))
2084                                 break;
2085                         left--;
2086                 }
2087         }
2088         if (write && first)
2089                 return -EINVAL;
2090         *lenp -= left;
2091         *ppos += *lenp;
2092         return 0;
2093 #undef TMPBUFLEN
2094 }
2095
2096 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
2097                                      struct file *filp,
2098                                      void __user *buffer,
2099                                      size_t *lenp, loff_t *ppos,
2100                                      unsigned long convmul,
2101                                      unsigned long convdiv)
2102 {
2103         return __do_proc_doulongvec_minmax(table->data, table, write,
2104                         filp, buffer, lenp, ppos, convmul, convdiv);
2105 }
2106
2107 /**
2108  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2109  * @table: the sysctl table
2110  * @write: %TRUE if this is a write to the sysctl file
2111  * @filp: the file structure
2112  * @buffer: the user buffer
2113  * @lenp: the size of the user buffer
2114  * @ppos: file position
2115  *
2116  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2117  * values from/to the user buffer, treated as an ASCII string.
2118  *
2119  * This routine will ensure the values are within the range specified by
2120  * table->extra1 (min) and table->extra2 (max).
2121  *
2122  * Returns 0 on success.
2123  */
2124 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2125                            void __user *buffer, size_t *lenp, loff_t *ppos)
2126 {
2127     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2128 }
2129
2130 /**
2131  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2132  * @table: the sysctl table
2133  * @write: %TRUE if this is a write to the sysctl file
2134  * @filp: the file structure
2135  * @buffer: the user buffer
2136  * @lenp: the size of the user buffer
2137  * @ppos: file position
2138  *
2139  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2140  * values from/to the user buffer, treated as an ASCII string. The values
2141  * are treated as milliseconds, and converted to jiffies when they are stored.
2142  *
2143  * This routine will ensure the values are within the range specified by
2144  * table->extra1 (min) and table->extra2 (max).
2145  *
2146  * Returns 0 on success.
2147  */
2148 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2149                                       struct file *filp,
2150                                       void __user *buffer,
2151                                       size_t *lenp, loff_t *ppos)
2152 {
2153     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2154                                      lenp, ppos, HZ, 1000l);
2155 }
2156
2157
2158 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2159                                          int *valp,
2160                                          int write, void *data)
2161 {
2162         if (write) {
2163                 if (*lvalp > LONG_MAX / HZ)
2164                         return 1;
2165                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2166         } else {
2167                 int val = *valp;
2168                 unsigned long lval;
2169                 if (val < 0) {
2170                         *negp = -1;
2171                         lval = (unsigned long)-val;
2172                 } else {
2173                         *negp = 0;
2174                         lval = (unsigned long)val;
2175                 }
2176                 *lvalp = lval / HZ;
2177         }
2178         return 0;
2179 }
2180
2181 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2182                                                 int *valp,
2183                                                 int write, void *data)
2184 {
2185         if (write) {
2186                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2187                         return 1;
2188                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2189         } else {
2190                 int val = *valp;
2191                 unsigned long lval;
2192                 if (val < 0) {
2193                         *negp = -1;
2194                         lval = (unsigned long)-val;
2195                 } else {
2196                         *negp = 0;
2197                         lval = (unsigned long)val;
2198                 }
2199                 *lvalp = jiffies_to_clock_t(lval);
2200         }
2201         return 0;
2202 }
2203
2204 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2205                                             int *valp,
2206                                             int write, void *data)
2207 {
2208         if (write) {
2209                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2210         } else {
2211                 int val = *valp;
2212                 unsigned long lval;
2213                 if (val < 0) {
2214                         *negp = -1;
2215                         lval = (unsigned long)-val;
2216                 } else {
2217                         *negp = 0;
2218                         lval = (unsigned long)val;
2219                 }
2220                 *lvalp = jiffies_to_msecs(lval);
2221         }
2222         return 0;
2223 }
2224
2225 /**
2226  * proc_dointvec_jiffies - read a vector of integers as seconds
2227  * @table: the sysctl table
2228  * @write: %TRUE if this is a write to the sysctl file
2229  * @filp: the file structure
2230  * @buffer: the user buffer
2231  * @lenp: the size of the user buffer
2232  * @ppos: file position
2233  *
2234  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2235  * values from/to the user buffer, treated as an ASCII string.
2236  * The values read are assumed to be in seconds, and are converted into
2237  * jiffies.
2238  *
2239  * Returns 0 on success.
2240  */
2241 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2242                           void __user *buffer, size_t *lenp, loff_t *ppos)
2243 {
2244     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2245                             do_proc_dointvec_jiffies_conv,NULL);
2246 }
2247
2248 /**
2249  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2250  * @table: the sysctl table
2251  * @write: %TRUE if this is a write to the sysctl file
2252  * @filp: the file structure
2253  * @buffer: the user buffer
2254  * @lenp: the size of the user buffer
2255  * @ppos: pointer to the file position
2256  *
2257  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2258  * values from/to the user buffer, treated as an ASCII string.
2259  * The values read are assumed to be in 1/USER_HZ seconds, and
2260  * are converted into jiffies.
2261  *
2262  * Returns 0 on success.
2263  */
2264 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2265                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2266 {
2267     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2268                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2269 }
2270
2271 /**
2272  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2273  * @table: the sysctl table
2274  * @write: %TRUE if this is a write to the sysctl file
2275  * @filp: the file structure
2276  * @buffer: the user buffer
2277  * @lenp: the size of the user buffer
2278  * @ppos: file position
2279  * @ppos: the current position in the file
2280  *
2281  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2282  * values from/to the user buffer, treated as an ASCII string.
2283  * The values read are assumed to be in 1/1000 seconds, and
2284  * are converted into jiffies.
2285  *
2286  * Returns 0 on success.
2287  */
2288 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2289                              void __user *buffer, size_t *lenp, loff_t *ppos)
2290 {
2291         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2292                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2293 }
2294
2295 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
2296                            void __user *buffer, size_t *lenp, loff_t *ppos)
2297 {
2298         struct pid *new_pid;
2299         pid_t tmp;
2300         int r;
2301
2302         tmp = pid_nr(cad_pid);
2303
2304         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2305                                lenp, ppos, NULL, NULL);
2306         if (r || !write)
2307                 return r;
2308
2309         new_pid = find_get_pid(tmp);
2310         if (!new_pid)
2311                 return -ESRCH;
2312
2313         put_pid(xchg(&cad_pid, new_pid));
2314         return 0;
2315 }
2316
2317 #else /* CONFIG_PROC_FS */
2318
2319 int proc_dostring(ctl_table *table, int write, struct file *filp,
2320                   void __user *buffer, size_t *lenp, loff_t *ppos)
2321 {
2322         return -ENOSYS;
2323 }
2324
2325 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2326                   void __user *buffer, size_t *lenp, loff_t *ppos)
2327 {
2328         return -ENOSYS;
2329 }
2330
2331 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2332                         void __user *buffer, size_t *lenp, loff_t *ppos)
2333 {
2334         return -ENOSYS;
2335 }
2336
2337 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2338                     void __user *buffer, size_t *lenp, loff_t *ppos)
2339 {
2340         return -ENOSYS;
2341 }
2342
2343 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2344                     void __user *buffer, size_t *lenp, loff_t *ppos)
2345 {
2346         return -ENOSYS;
2347 }
2348
2349 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2350                     void __user *buffer, size_t *lenp, loff_t *ppos)
2351 {
2352         return -ENOSYS;
2353 }
2354
2355 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2356                              void __user *buffer, size_t *lenp, loff_t *ppos)
2357 {
2358         return -ENOSYS;
2359 }
2360
2361 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2362                     void __user *buffer, size_t *lenp, loff_t *ppos)
2363 {
2364         return -ENOSYS;
2365 }
2366
2367 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2368                                       struct file *filp,
2369                                       void __user *buffer,
2370                                       size_t *lenp, loff_t *ppos)
2371 {
2372     return -ENOSYS;
2373 }
2374
2375
2376 #endif /* CONFIG_PROC_FS */
2377
2378
2379 #ifdef CONFIG_SYSCTL_SYSCALL
2380 /*
2381  * General sysctl support routines
2382  */
2383
2384 /* The generic string strategy routine: */
2385 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2386                   void __user *oldval, size_t __user *oldlenp,
2387                   void __user *newval, size_t newlen)
2388 {
2389         if (!table->data || !table->maxlen)
2390                 return -ENOTDIR;
2391
2392         if (oldval && oldlenp) {
2393                 size_t bufsize;
2394                 if (get_user(bufsize, oldlenp))
2395                         return -EFAULT;
2396                 if (bufsize) {
2397                         size_t len = strlen(table->data), copied;
2398
2399                         /* This shouldn't trigger for a well-formed sysctl */
2400                         if (len > table->maxlen)
2401                                 len = table->maxlen;
2402
2403                         /* Copy up to a max of bufsize-1 bytes of the string */
2404                         copied = (len >= bufsize) ? bufsize - 1 : len;
2405
2406                         if (copy_to_user(oldval, table->data, copied) ||
2407                             put_user(0, (char __user *)(oldval + copied)))
2408                                 return -EFAULT;
2409                         if (put_user(len, oldlenp))
2410                                 return -EFAULT;
2411                 }
2412         }
2413         if (newval && newlen) {
2414                 size_t len = newlen;
2415                 if (len > table->maxlen)
2416                         len = table->maxlen;
2417                 if(copy_from_user(table->data, newval, len))
2418                         return -EFAULT;
2419                 if (len == table->maxlen)
2420                         len--;
2421                 ((char *) table->data)[len] = 0;
2422         }
2423         return 1;
2424 }
2425
2426 /*
2427  * This function makes sure that all of the integers in the vector
2428  * are between the minimum and maximum values given in the arrays
2429  * table->extra1 and table->extra2, respectively.
2430  */
2431 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2432                 void __user *oldval, size_t __user *oldlenp,
2433                 void __user *newval, size_t newlen)
2434 {
2435
2436         if (newval && newlen) {
2437                 int __user *vec = (int __user *) newval;
2438                 int *min = (int *) table->extra1;
2439                 int *max = (int *) table->extra2;
2440                 size_t length;
2441                 int i;
2442
2443                 if (newlen % sizeof(int) != 0)
2444                         return -EINVAL;
2445
2446                 if (!table->extra1 && !table->extra2)
2447                         return 0;
2448
2449                 if (newlen > table->maxlen)
2450                         newlen = table->maxlen;
2451                 length = newlen / sizeof(int);
2452
2453                 for (i = 0; i < length; i++) {
2454                         int value;
2455                         if (get_user(value, vec + i))
2456                                 return -EFAULT;
2457                         if (min && value < min[i])
2458                                 return -EINVAL;
2459                         if (max && value > max[i])
2460                                 return -EINVAL;
2461                 }
2462         }
2463         return 0;
2464 }
2465
2466 /* Strategy function to convert jiffies to seconds */
2467 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2468                 void __user *oldval, size_t __user *oldlenp,
2469                 void __user *newval, size_t newlen)
2470 {
2471         if (oldval && oldlenp) {
2472                 size_t olen;
2473
2474                 if (get_user(olen, oldlenp))
2475                         return -EFAULT;
2476                 if (olen) {
2477                         int val;
2478
2479                         if (olen < sizeof(int))
2480                                 return -EINVAL;
2481
2482                         val = *(int *)(table->data) / HZ;
2483                         if (put_user(val, (int __user *)oldval))
2484                                 return -EFAULT;
2485                         if (put_user(sizeof(int), oldlenp))
2486                                 return -EFAULT;
2487                 }
2488         }
2489         if (newval && newlen) {
2490                 int new;
2491                 if (newlen != sizeof(int))
2492                         return -EINVAL;
2493                 if (get_user(new, (int __user *)newval))
2494                         return -EFAULT;
2495                 *(int *)(table->data) = new*HZ;
2496         }
2497         return 1;
2498 }
2499
2500 /* Strategy function to convert jiffies to seconds */
2501 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2502                 void __user *oldval, size_t __user *oldlenp,
2503                 void __user *newval, size_t newlen)
2504 {
2505         if (oldval && oldlenp) {
2506                 size_t olen;
2507
2508                 if (get_user(olen, oldlenp))
2509                         return -EFAULT;
2510                 if (olen) {
2511                         int val;
2512
2513                         if (olen < sizeof(int))
2514                                 return -EINVAL;
2515
2516                         val = jiffies_to_msecs(*(int *)(table->data));
2517                         if (put_user(val, (int __user *)oldval))
2518                                 return -EFAULT;
2519                         if (put_user(sizeof(int), oldlenp))
2520                                 return -EFAULT;
2521                 }
2522         }
2523         if (newval && newlen) {
2524                 int new;
2525                 if (newlen != sizeof(int))
2526                         return -EINVAL;
2527                 if (get_user(new, (int __user *)newval))
2528                         return -EFAULT;
2529                 *(int *)(table->data) = msecs_to_jiffies(new);
2530         }
2531         return 1;
2532 }
2533
2534
2535
2536 #else /* CONFIG_SYSCTL_SYSCALL */
2537
2538
2539 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2540 {
2541         static int msg_count;
2542         struct __sysctl_args tmp;
2543         int name[CTL_MAXNAME];
2544         int i;
2545
2546         /* Read in the sysctl name for better debug message logging */
2547         if (copy_from_user(&tmp, args, sizeof(tmp)))
2548                 return -EFAULT;
2549         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2550                 return -ENOTDIR;
2551         for (i = 0; i < tmp.nlen; i++)
2552                 if (get_user(name[i], tmp.name + i))
2553                         return -EFAULT;
2554
2555         /* Ignore accesses to kernel.version */
2556         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2557                 goto out;
2558
2559         if (msg_count < 5) {
2560                 msg_count++;
2561                 printk(KERN_INFO
2562                         "warning: process `%s' used the removed sysctl "
2563                         "system call with ", current->comm);
2564                 for (i = 0; i < tmp.nlen; i++)
2565                         printk("%d.", name[i]);
2566                 printk("\n");
2567         }
2568 out:
2569         return -ENOSYS;
2570 }
2571
2572 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2573                   void __user *oldval, size_t __user *oldlenp,
2574                   void __user *newval, size_t newlen)
2575 {
2576         return -ENOSYS;
2577 }
2578
2579 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2580                 void __user *oldval, size_t __user *oldlenp,
2581                 void __user *newval, size_t newlen)
2582 {
2583         return -ENOSYS;
2584 }
2585
2586 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2587                 void __user *oldval, size_t __user *oldlenp,
2588                 void __user *newval, size_t newlen)
2589 {
2590         return -ENOSYS;
2591 }
2592
2593 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2594                 void __user *oldval, size_t __user *oldlenp,
2595                 void __user *newval, size_t newlen)
2596 {
2597         return -ENOSYS;
2598 }
2599
2600 #endif /* CONFIG_SYSCTL_SYSCALL */
2601
2602 /*
2603  * No sense putting this after each symbol definition, twice,
2604  * exception granted :-)
2605  */
2606 EXPORT_SYMBOL(proc_dointvec);
2607 EXPORT_SYMBOL(proc_dointvec_jiffies);
2608 EXPORT_SYMBOL(proc_dointvec_minmax);
2609 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2610 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2611 EXPORT_SYMBOL(proc_dostring);
2612 EXPORT_SYMBOL(proc_doulongvec_minmax);
2613 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2614 EXPORT_SYMBOL(register_sysctl_table);
2615 EXPORT_SYMBOL(sysctl_intvec);
2616 EXPORT_SYMBOL(sysctl_jiffies);
2617 EXPORT_SYMBOL(sysctl_ms_jiffies);
2618 EXPORT_SYMBOL(sysctl_string);
2619 EXPORT_SYMBOL(unregister_sysctl_table);