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

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/key.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49 #include <linux/ftrace.h>
  50
  51 #include <asm/uaccess.h>
  52 #include <asm/processor.h>
  53
  54 #ifdef CONFIG_X86
  55 #include <asm/nmi.h>
  56 #include <asm/stacktrace.h>
  57 #include <asm/io.h>
  58 #endif
  59
  60 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  61
  62 #if defined(CONFIG_SYSCTL)
  63
  64 /* External variables not in a header file. */
  65 extern int C_A_D;
  66 extern int print_fatal_signals;
  67 extern int sysctl_overcommit_memory;
  68 extern int sysctl_overcommit_ratio;
  69 extern int sysctl_panic_on_oom;
  70 extern int sysctl_oom_kill_allocating_task;
  71 extern int sysctl_oom_dump_tasks;
  72 extern int max_threads;
  73 extern int core_uses_pid;
  74 extern int suid_dumpable;
  75 extern char core_pattern[];
  76 extern int pid_max;
  77 extern int min_free_kbytes;
  78 extern int pid_max_min, pid_max_max;
  79 extern int sysctl_drop_caches;
  80 extern int percpu_pagelist_fraction;
  81 extern int compat_log;
  82 extern int maps_protect;
  83 extern int sysctl_stat_interval;
  84 extern int latencytop_enabled;
  85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  86
  87 /* Constants used for minimum and  maximum */
  88 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
  89 static int one = 1;
  90 #endif
  91
  92 #ifdef CONFIG_DETECT_SOFTLOCKUP
  93 static int sixty = 60;
  94 #endif
  95
  96 #ifdef CONFIG_MMU
  97 static int two = 2;
  98 #endif
  99
 100 static int zero;
 101 static int one_hundred = 100;
 102
 103 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 104 static int maxolduid = 65535;
 105 static int minolduid;
 106 static int min_percpu_pagelist_fract = 8;
 107
 108 static int ngroups_max = NGROUPS_MAX;
 109
 110 #ifdef CONFIG_KMOD
 111 extern char modprobe_path[];
 112 #endif
 113 #ifdef CONFIG_CHR_DEV_SG
 114 extern int sg_big_buff;
 115 #endif
 116
 117 #ifdef __sparc__
 118 extern char reboot_command [];
 119 extern int stop_a_enabled;
 120 extern int scons_pwroff;
 121 #endif
 122
 123 #ifdef __hppa__
 124 extern int pwrsw_enabled;
 125 extern int unaligned_enabled;
 126 #endif
 127
 128 #ifdef CONFIG_S390
 129 #ifdef CONFIG_MATHEMU
 130 extern int sysctl_ieee_emulation_warnings;
 131 #endif
 132 extern int sysctl_userprocess_debug;
 133 extern int spin_retry;
 134 #endif
 135
 136 extern int sysctl_hz_timer;
 137
 138 #ifdef CONFIG_BSD_PROCESS_ACCT
 139 extern int acct_parm[];
 140 #endif
 141
 142 #ifdef CONFIG_IA64
 143 extern int no_unaligned_warning;
 144 #endif
 145
 146 #ifdef CONFIG_RT_MUTEXES
 147 extern int max_lock_depth;
 148 #endif
 149
 150 #ifdef CONFIG_PROC_SYSCTL
 151 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 152                   void __user *buffer, size_t *lenp, loff_t *ppos);
 153 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 154                                void __user *buffer, size_t *lenp, loff_t *ppos);
 155 #endif
 156
 157 static struct ctl_table root_table[];
 158 static struct ctl_table_root sysctl_table_root;
 159 static struct ctl_table_header root_table_header = {
 160         .ctl_table = root_table,
 161         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 162         .root = &sysctl_table_root,
 163 };
 164 static struct ctl_table_root sysctl_table_root = {
 165         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 166         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 167 };
 168
 169 static struct ctl_table kern_table[];
 170 static struct ctl_table vm_table[];
 171 static struct ctl_table fs_table[];
 172 static struct ctl_table debug_table[];
 173 static struct ctl_table dev_table[];
 174 extern struct ctl_table random_table[];
 175 #ifdef CONFIG_INOTIFY_USER
 176 extern struct ctl_table inotify_table[];
 177 #endif
 178
 179 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 180 int sysctl_legacy_va_layout;
 181 #endif
 182
 183 extern int prove_locking;
 184 extern int lock_stat;
 185
 186 /* The default sysctl tables: */
 187
 188 static struct ctl_table root_table[] = {
 189         {
 190                 .ctl_name       = CTL_KERN,
 191                 .procname       = "kernel",
 192                 .mode           = 0555,
 193                 .child          = kern_table,
 194         },
 195         {
 196                 .ctl_name       = CTL_VM,
 197                 .procname       = "vm",
 198                 .mode           = 0555,
 199                 .child          = vm_table,
 200         },
 201         {
 202                 .ctl_name       = CTL_FS,
 203                 .procname       = "fs",
 204                 .mode           = 0555,
 205                 .child          = fs_table,
 206         },
 207         {
 208                 .ctl_name       = CTL_DEBUG,
 209                 .procname       = "debug",
 210                 .mode           = 0555,
 211                 .child          = debug_table,
 212         },
 213         {
 214                 .ctl_name       = CTL_DEV,
 215                 .procname       = "dev",
 216                 .mode           = 0555,
 217                 .child          = dev_table,
 218         },
 219 /*
 220  * NOTE: do not add new entries to this table unless you have read
 221  * Documentation/sysctl/ctl_unnumbered.txt
 222  */
 223         { .ctl_name = 0 }
 224 };
 225
 226 #ifdef CONFIG_SCHED_DEBUG
 227 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 228 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 229 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 230 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 231 #endif
 232
 233 static struct ctl_table kern_table[] = {
 234 #ifdef CONFIG_SCHED_DEBUG
 235         {
 236                 .ctl_name       = CTL_UNNUMBERED,
 237                 .procname       = "sched_min_granularity_ns",
 238                 .data           = &sysctl_sched_min_granularity,
 239                 .maxlen         = sizeof(unsigned int),
 240                 .mode           = 0644,
 241                 .proc_handler   = &sched_nr_latency_handler,
 242                 .strategy       = &sysctl_intvec,
 243                 .extra1         = &min_sched_granularity_ns,
 244                 .extra2         = &max_sched_granularity_ns,
 245         },
 246         {
 247                 .ctl_name       = CTL_UNNUMBERED,
 248                 .procname       = "sched_latency_ns",
 249                 .data           = &sysctl_sched_latency,
 250                 .maxlen         = sizeof(unsigned int),
 251                 .mode           = 0644,
 252                 .proc_handler   = &sched_nr_latency_handler,
 253                 .strategy       = &sysctl_intvec,
 254                 .extra1         = &min_sched_granularity_ns,
 255                 .extra2         = &max_sched_granularity_ns,
 256         },
 257         {
 258                 .ctl_name       = CTL_UNNUMBERED,
 259                 .procname       = "sched_wakeup_granularity_ns",
 260                 .data           = &sysctl_sched_wakeup_granularity,
 261                 .maxlen         = sizeof(unsigned int),
 262                 .mode           = 0644,
 263                 .proc_handler   = &proc_dointvec_minmax,
 264                 .strategy       = &sysctl_intvec,
 265                 .extra1         = &min_wakeup_granularity_ns,
 266                 .extra2         = &max_wakeup_granularity_ns,
 267         },
 268         {
 269                 .ctl_name       = CTL_UNNUMBERED,
 270                 .procname       = "sched_child_runs_first",
 271                 .data           = &sysctl_sched_child_runs_first,
 272                 .maxlen         = sizeof(unsigned int),
 273                 .mode           = 0644,
 274                 .proc_handler   = &proc_dointvec,
 275         },
 276         {
 277                 .ctl_name       = CTL_UNNUMBERED,
 278                 .procname       = "sched_features",
 279                 .data           = &sysctl_sched_features,
 280                 .maxlen         = sizeof(unsigned int),
 281                 .mode           = 0644,
 282                 .proc_handler   = &proc_dointvec,
 283         },
 284         {
 285                 .ctl_name       = CTL_UNNUMBERED,
 286                 .procname       = "sched_migration_cost",
 287                 .data           = &sysctl_sched_migration_cost,
 288                 .maxlen         = sizeof(unsigned int),
 289                 .mode           = 0644,
 290                 .proc_handler   = &proc_dointvec,
 291         },
 292         {
 293                 .ctl_name       = CTL_UNNUMBERED,
 294                 .procname       = "sched_nr_migrate",
 295                 .data           = &sysctl_sched_nr_migrate,
 296                 .maxlen         = sizeof(unsigned int),
 297                 .mode           = 0644,
 298                 .proc_handler   = &proc_dointvec,
 299         },
 300 #endif
 301         {
 302                 .ctl_name       = CTL_UNNUMBERED,
 303                 .procname       = "sched_rt_period_us",
 304                 .data           = &sysctl_sched_rt_period,
 305                 .maxlen         = sizeof(unsigned int),
 306                 .mode           = 0644,
 307                 .proc_handler   = &sched_rt_handler,
 308         },
 309         {
 310                 .ctl_name       = CTL_UNNUMBERED,
 311                 .procname       = "sched_rt_runtime_us",
 312                 .data           = &sysctl_sched_rt_runtime,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = &sched_rt_handler,
 316         },
 317         {
 318                 .ctl_name       = CTL_UNNUMBERED,
 319                 .procname       = "sched_compat_yield",
 320                 .data           = &sysctl_sched_compat_yield,
 321                 .maxlen         = sizeof(unsigned int),
 322                 .mode           = 0644,
 323                 .proc_handler   = &proc_dointvec,
 324         },
 325 #ifdef CONFIG_PROVE_LOCKING
 326         {
 327                 .ctl_name       = CTL_UNNUMBERED,
 328                 .procname       = "prove_locking",
 329                 .data           = &prove_locking,
 330                 .maxlen         = sizeof(int),
 331                 .mode           = 0644,
 332                 .proc_handler   = &proc_dointvec,
 333         },
 334 #endif
 335 #ifdef CONFIG_LOCK_STAT
 336         {
 337                 .ctl_name       = CTL_UNNUMBERED,
 338                 .procname       = "lock_stat",
 339                 .data           = &lock_stat,
 340                 .maxlen         = sizeof(int),
 341                 .mode           = 0644,
 342                 .proc_handler   = &proc_dointvec,
 343         },
 344 #endif
 345         {
 346                 .ctl_name       = KERN_PANIC,
 347                 .procname       = "panic",
 348                 .data           = &panic_timeout,
 349                 .maxlen         = sizeof(int),
 350                 .mode           = 0644,
 351                 .proc_handler   = &proc_dointvec,
 352         },
 353         {
 354                 .ctl_name       = KERN_CORE_USES_PID,
 355                 .procname       = "core_uses_pid",
 356                 .data           = &core_uses_pid,
 357                 .maxlen         = sizeof(int),
 358                 .mode           = 0644,
 359                 .proc_handler   = &proc_dointvec,
 360         },
 361         {
 362                 .ctl_name       = KERN_CORE_PATTERN,
 363                 .procname       = "core_pattern",
 364                 .data           = core_pattern,
 365                 .maxlen         = CORENAME_MAX_SIZE,
 366                 .mode           = 0644,
 367                 .proc_handler   = &proc_dostring,
 368                 .strategy       = &sysctl_string,
 369         },
 370 #ifdef CONFIG_PROC_SYSCTL
 371         {
 372                 .procname       = "tainted",
 373                 .data           = &tainted,
 374                 .maxlen         = sizeof(int),
 375                 .mode           = 0644,
 376                 .proc_handler   = &proc_dointvec_taint,
 377         },
 378 #endif
 379 #ifdef CONFIG_LATENCYTOP
 380         {
 381                 .procname       = "latencytop",
 382                 .data           = &latencytop_enabled,
 383                 .maxlen         = sizeof(int),
 384                 .mode           = 0644,
 385                 .proc_handler   = &proc_dointvec,
 386         },
 387 #endif
 388 #ifdef CONFIG_BLK_DEV_INITRD
 389         {
 390                 .ctl_name       = KERN_REALROOTDEV,
 391                 .procname       = "real-root-dev",
 392                 .data           = &real_root_dev,
 393                 .maxlen         = sizeof(int),
 394                 .mode           = 0644,
 395                 .proc_handler   = &proc_dointvec,
 396         },
 397 #endif
 398         {
 399                 .ctl_name       = CTL_UNNUMBERED,
 400                 .procname       = "print-fatal-signals",
 401                 .data           = &print_fatal_signals,
 402                 .maxlen         = sizeof(int),
 403                 .mode           = 0644,
 404                 .proc_handler   = &proc_dointvec,
 405         },
 406 #ifdef __sparc__
 407         {
 408                 .ctl_name       = KERN_SPARC_REBOOT,
 409                 .procname       = "reboot-cmd",
 410                 .data           = reboot_command,
 411                 .maxlen         = 256,
 412                 .mode           = 0644,
 413                 .proc_handler   = &proc_dostring,
 414                 .strategy       = &sysctl_string,
 415         },
 416         {
 417                 .ctl_name       = KERN_SPARC_STOP_A,
 418                 .procname       = "stop-a",
 419                 .data           = &stop_a_enabled,
 420                 .maxlen         = sizeof (int),
 421                 .mode           = 0644,
 422                 .proc_handler   = &proc_dointvec,
 423         },
 424         {
 425                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 426                 .procname       = "scons-poweroff",
 427                 .data           = &scons_pwroff,
 428                 .maxlen         = sizeof (int),
 429                 .mode           = 0644,
 430                 .proc_handler   = &proc_dointvec,
 431         },
 432 #endif
 433 #ifdef __hppa__
 434         {
 435                 .ctl_name       = KERN_HPPA_PWRSW,
 436                 .procname       = "soft-power",
 437                 .data           = &pwrsw_enabled,
 438                 .maxlen         = sizeof (int),
 439                 .mode           = 0644,
 440                 .proc_handler   = &proc_dointvec,
 441         },
 442         {
 443                 .ctl_name       = KERN_HPPA_UNALIGNED,
 444                 .procname       = "unaligned-trap",
 445                 .data           = &unaligned_enabled,
 446                 .maxlen         = sizeof (int),
 447                 .mode           = 0644,
 448                 .proc_handler   = &proc_dointvec,
 449         },
 450 #endif
 451         {
 452                 .ctl_name       = KERN_CTLALTDEL,
 453                 .procname       = "ctrl-alt-del",
 454                 .data           = &C_A_D,
 455                 .maxlen         = sizeof(int),
 456                 .mode           = 0644,
 457                 .proc_handler   = &proc_dointvec,
 458         },
 459 #ifdef CONFIG_FTRACE
 460         {
 461                 .ctl_name       = CTL_UNNUMBERED,
 462                 .procname       = "ftrace_enabled",
 463                 .data           = &ftrace_enabled,
 464                 .maxlen         = sizeof(int),
 465                 .mode           = 0644,
 466                 .proc_handler   = &ftrace_enable_sysctl,
 467         },
 468 #endif
 469 #ifdef CONFIG_KMOD
 470         {
 471                 .ctl_name       = KERN_MODPROBE,
 472                 .procname       = "modprobe",
 473                 .data           = &modprobe_path,
 474                 .maxlen         = KMOD_PATH_LEN,
 475                 .mode           = 0644,
 476                 .proc_handler   = &proc_dostring,
 477                 .strategy       = &sysctl_string,
 478         },
 479 #endif
 480 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 481         {
 482                 .ctl_name       = KERN_HOTPLUG,
 483                 .procname       = "hotplug",
 484                 .data           = &uevent_helper,
 485                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 486                 .mode           = 0644,
 487                 .proc_handler   = &proc_dostring,
 488                 .strategy       = &sysctl_string,
 489         },
 490 #endif
 491 #ifdef CONFIG_CHR_DEV_SG
 492         {
 493                 .ctl_name       = KERN_SG_BIG_BUFF,
 494                 .procname       = "sg-big-buff",
 495                 .data           = &sg_big_buff,
 496                 .maxlen         = sizeof (int),
 497                 .mode           = 0444,
 498                 .proc_handler   = &proc_dointvec,
 499         },
 500 #endif
 501 #ifdef CONFIG_BSD_PROCESS_ACCT
 502         {
 503                 .ctl_name       = KERN_ACCT,
 504                 .procname       = "acct",
 505                 .data           = &acct_parm,
 506                 .maxlen         = 3*sizeof(int),
 507                 .mode           = 0644,
 508                 .proc_handler   = &proc_dointvec,
 509         },
 510 #endif
 511 #ifdef CONFIG_MAGIC_SYSRQ
 512         {
 513                 .ctl_name       = KERN_SYSRQ,
 514                 .procname       = "sysrq",
 515                 .data           = &__sysrq_enabled,
 516                 .maxlen         = sizeof (int),
 517                 .mode           = 0644,
 518                 .proc_handler   = &proc_dointvec,
 519         },
 520 #endif
 521 #ifdef CONFIG_PROC_SYSCTL
 522         {
 523                 .procname       = "cad_pid",
 524                 .data           = NULL,
 525                 .maxlen         = sizeof (int),
 526                 .mode           = 0600,
 527                 .proc_handler   = &proc_do_cad_pid,
 528         },
 529 #endif
 530         {
 531                 .ctl_name       = KERN_MAX_THREADS,
 532                 .procname       = "threads-max",
 533                 .data           = &max_threads,
 534                 .maxlen         = sizeof(int),
 535                 .mode           = 0644,
 536                 .proc_handler   = &proc_dointvec,
 537         },
 538         {
 539                 .ctl_name       = KERN_RANDOM,
 540                 .procname       = "random",
 541                 .mode           = 0555,
 542                 .child          = random_table,
 543         },
 544         {
 545                 .ctl_name       = KERN_OVERFLOWUID,
 546                 .procname       = "overflowuid",
 547                 .data           = &overflowuid,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = &proc_dointvec_minmax,
 551                 .strategy       = &sysctl_intvec,
 552                 .extra1         = &minolduid,
 553                 .extra2         = &maxolduid,
 554         },
 555         {
 556                 .ctl_name       = KERN_OVERFLOWGID,
 557                 .procname       = "overflowgid",
 558                 .data           = &overflowgid,
 559                 .maxlen         = sizeof(int),
 560                 .mode           = 0644,
 561                 .proc_handler   = &proc_dointvec_minmax,
 562                 .strategy       = &sysctl_intvec,
 563                 .extra1         = &minolduid,
 564                 .extra2         = &maxolduid,
 565         },
 566 #ifdef CONFIG_S390
 567 #ifdef CONFIG_MATHEMU
 568         {
 569                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 570                 .procname       = "ieee_emulation_warnings",
 571                 .data           = &sysctl_ieee_emulation_warnings,
 572                 .maxlen         = sizeof(int),
 573                 .mode           = 0644,
 574                 .proc_handler   = &proc_dointvec,
 575         },
 576 #endif
 577 #ifdef CONFIG_NO_IDLE_HZ
 578         {
 579                 .ctl_name       = KERN_HZ_TIMER,
 580                 .procname       = "hz_timer",
 581                 .data           = &sysctl_hz_timer,
 582                 .maxlen         = sizeof(int),
 583                 .mode           = 0644,
 584                 .proc_handler   = &proc_dointvec,
 585         },
 586 #endif
 587         {
 588                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 589                 .procname       = "userprocess_debug",
 590                 .data           = &sysctl_userprocess_debug,
 591                 .maxlen         = sizeof(int),
 592                 .mode           = 0644,
 593                 .proc_handler   = &proc_dointvec,
 594         },
 595 #endif
 596         {
 597                 .ctl_name       = KERN_PIDMAX,
 598                 .procname       = "pid_max",
 599                 .data           = &pid_max,
 600                 .maxlen         = sizeof (int),
 601                 .mode           = 0644,
 602                 .proc_handler   = &proc_dointvec_minmax,
 603                 .strategy       = sysctl_intvec,
 604                 .extra1         = &pid_max_min,
 605                 .extra2         = &pid_max_max,
 606         },
 607         {
 608                 .ctl_name       = KERN_PANIC_ON_OOPS,
 609                 .procname       = "panic_on_oops",
 610                 .data           = &panic_on_oops,
 611                 .maxlen         = sizeof(int),
 612                 .mode           = 0644,
 613                 .proc_handler   = &proc_dointvec,
 614         },
 615 #if defined CONFIG_PRINTK
 616         {
 617                 .ctl_name       = KERN_PRINTK,
 618                 .procname       = "printk",
 619                 .data           = &console_loglevel,
 620                 .maxlen         = 4*sizeof(int),
 621                 .mode           = 0644,
 622                 .proc_handler   = &proc_dointvec,
 623         },
 624         {
 625                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 626                 .procname       = "printk_ratelimit",
 627                 .data           = &printk_ratelimit_jiffies,
 628                 .maxlen         = sizeof(int),
 629                 .mode           = 0644,
 630                 .proc_handler   = &proc_dointvec_jiffies,
 631                 .strategy       = &sysctl_jiffies,
 632         },
 633         {
 634                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 635                 .procname       = "printk_ratelimit_burst",
 636                 .data           = &printk_ratelimit_burst,
 637                 .maxlen         = sizeof(int),
 638                 .mode           = 0644,
 639                 .proc_handler   = &proc_dointvec,
 640         },
 641 #endif
 642         {
 643                 .ctl_name       = KERN_NGROUPS_MAX,
 644                 .procname       = "ngroups_max",
 645                 .data           = &ngroups_max,
 646                 .maxlen         = sizeof (int),
 647                 .mode           = 0444,
 648                 .proc_handler   = &proc_dointvec,
 649         },
 650 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 651         {
 652                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 653                 .procname       = "unknown_nmi_panic",
 654                 .data           = &unknown_nmi_panic,
 655                 .maxlen         = sizeof (int),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_dointvec,
 658         },
 659         {
 660                 .procname       = "nmi_watchdog",
 661                 .data           = &nmi_watchdog_enabled,
 662                 .maxlen         = sizeof (int),
 663                 .mode           = 0644,
 664                 .proc_handler   = &proc_nmi_enabled,
 665         },
 666 #endif
 667 #if defined(CONFIG_X86)
 668         {
 669                 .ctl_name       = KERN_PANIC_ON_NMI,
 670                 .procname       = "panic_on_unrecovered_nmi",
 671                 .data           = &panic_on_unrecovered_nmi,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = &proc_dointvec,
 675         },
 676         {
 677                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 678                 .procname       = "bootloader_type",
 679                 .data           = &bootloader_type,
 680                 .maxlen         = sizeof (int),
 681                 .mode           = 0444,
 682                 .proc_handler   = &proc_dointvec,
 683         },
 684         {
 685                 .ctl_name       = CTL_UNNUMBERED,
 686                 .procname       = "kstack_depth_to_print",
 687                 .data           = &kstack_depth_to_print,
 688                 .maxlen         = sizeof(int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_dointvec,
 691         },
 692         {
 693                 .ctl_name       = CTL_UNNUMBERED,
 694                 .procname       = "io_delay_type",
 695                 .data           = &io_delay_type,
 696                 .maxlen         = sizeof(int),
 697                 .mode           = 0644,
 698                 .proc_handler   = &proc_dointvec,
 699         },
 700 #endif
 701 #if defined(CONFIG_MMU)
 702         {
 703                 .ctl_name       = KERN_RANDOMIZE,
 704                 .procname       = "randomize_va_space",
 705                 .data           = &randomize_va_space,
 706                 .maxlen         = sizeof(int),
 707                 .mode           = 0644,
 708                 .proc_handler   = &proc_dointvec,
 709         },
 710 #endif
 711 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 712         {
 713                 .ctl_name       = KERN_SPIN_RETRY,
 714                 .procname       = "spin_retry",
 715                 .data           = &spin_retry,
 716                 .maxlen         = sizeof (int),
 717                 .mode           = 0644,
 718                 .proc_handler   = &proc_dointvec,
 719         },
 720 #endif
 721 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 722         {
 723                 .procname       = "acpi_video_flags",
 724                 .data           = &acpi_realmode_flags,
 725                 .maxlen         = sizeof (unsigned long),
 726                 .mode           = 0644,
 727                 .proc_handler   = &proc_doulongvec_minmax,
 728         },
 729 #endif
 730 #ifdef CONFIG_IA64
 731         {
 732                 .ctl_name       = KERN_IA64_UNALIGNED,
 733                 .procname       = "ignore-unaligned-usertrap",
 734                 .data           = &no_unaligned_warning,
 735                 .maxlen         = sizeof (int),
 736                 .mode           = 0644,
 737                 .proc_handler   = &proc_dointvec,
 738         },
 739 #endif
 740 #ifdef CONFIG_DETECT_SOFTLOCKUP
 741         {
 742                 .ctl_name       = CTL_UNNUMBERED,
 743                 .procname       = "softlockup_thresh",
 744                 .data           = &softlockup_thresh,
 745                 .maxlen         = sizeof(unsigned long),
 746                 .mode           = 0644,
 747                 .proc_handler   = &proc_doulongvec_minmax,
 748                 .strategy       = &sysctl_intvec,
 749                 .extra1         = &one,
 750                 .extra2         = &sixty,
 751         },
 752         {
 753                 .ctl_name       = CTL_UNNUMBERED,
 754                 .procname       = "hung_task_check_count",
 755                 .data           = &sysctl_hung_task_check_count,
 756                 .maxlen         = sizeof(unsigned long),
 757                 .mode           = 0644,
 758                 .proc_handler   = &proc_doulongvec_minmax,
 759                 .strategy       = &sysctl_intvec,
 760         },
 761         {
 762                 .ctl_name       = CTL_UNNUMBERED,
 763                 .procname       = "hung_task_timeout_secs",
 764                 .data           = &sysctl_hung_task_timeout_secs,
 765                 .maxlen         = sizeof(unsigned long),
 766                 .mode           = 0644,
 767                 .proc_handler   = &proc_doulongvec_minmax,
 768                 .strategy       = &sysctl_intvec,
 769         },
 770         {
 771                 .ctl_name       = CTL_UNNUMBERED,
 772                 .procname       = "hung_task_warnings",
 773                 .data           = &sysctl_hung_task_warnings,
 774                 .maxlen         = sizeof(unsigned long),
 775                 .mode           = 0644,
 776                 .proc_handler   = &proc_doulongvec_minmax,
 777                 .strategy       = &sysctl_intvec,
 778         },
 779 #endif
 780 #ifdef CONFIG_COMPAT
 781         {
 782                 .ctl_name       = KERN_COMPAT_LOG,
 783                 .procname       = "compat-log",
 784                 .data           = &compat_log,
 785                 .maxlen         = sizeof (int),
 786                 .mode           = 0644,
 787                 .proc_handler   = &proc_dointvec,
 788         },
 789 #endif
 790 #ifdef CONFIG_RT_MUTEXES
 791         {
 792                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 793                 .procname       = "max_lock_depth",
 794                 .data           = &max_lock_depth,
 795                 .maxlen         = sizeof(int),
 796                 .mode           = 0644,
 797                 .proc_handler   = &proc_dointvec,
 798         },
 799 #endif
 800 #ifdef CONFIG_PROC_FS
 801         {
 802                 .ctl_name       = CTL_UNNUMBERED,
 803                 .procname       = "maps_protect",
 804                 .data           = &maps_protect,
 805                 .maxlen         = sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = &proc_dointvec,
 808         },
 809 #endif
 810         {
 811                 .ctl_name       = CTL_UNNUMBERED,
 812                 .procname       = "poweroff_cmd",
 813                 .data           = &poweroff_cmd,
 814                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 815                 .mode           = 0644,
 816                 .proc_handler   = &proc_dostring,
 817                 .strategy       = &sysctl_string,
 818         },
 819 #ifdef CONFIG_KEYS
 820         {
 821                 .ctl_name       = CTL_UNNUMBERED,
 822                 .procname       = "keys",
 823                 .mode           = 0555,
 824                 .child          = key_sysctls,
 825         },
 826 #endif
 827 /*
 828  * NOTE: do not add new entries to this table unless you have read
 829  * Documentation/sysctl/ctl_unnumbered.txt
 830  */
 831         { .ctl_name = 0 }
 832 };
 833
 834 static struct ctl_table vm_table[] = {
 835         {
 836                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 837                 .procname       = "overcommit_memory",
 838                 .data           = &sysctl_overcommit_memory,
 839                 .maxlen         = sizeof(sysctl_overcommit_memory),
 840                 .mode           = 0644,
 841                 .proc_handler   = &proc_dointvec,
 842         },
 843         {
 844                 .ctl_name       = VM_PANIC_ON_OOM,
 845                 .procname       = "panic_on_oom",
 846                 .data           = &sysctl_panic_on_oom,
 847                 .maxlen         = sizeof(sysctl_panic_on_oom),
 848                 .mode           = 0644,
 849                 .proc_handler   = &proc_dointvec,
 850         },
 851         {
 852                 .ctl_name       = CTL_UNNUMBERED,
 853                 .procname       = "oom_kill_allocating_task",
 854                 .data           = &sysctl_oom_kill_allocating_task,
 855                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 856                 .mode           = 0644,
 857                 .proc_handler   = &proc_dointvec,
 858         },
 859         {
 860                 .ctl_name       = CTL_UNNUMBERED,
 861                 .procname       = "oom_dump_tasks",
 862                 .data           = &sysctl_oom_dump_tasks,
 863                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 864                 .mode           = 0644,
 865                 .proc_handler   = &proc_dointvec,
 866         },
 867         {
 868                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 869                 .procname       = "overcommit_ratio",
 870                 .data           = &sysctl_overcommit_ratio,
 871                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 872                 .mode           = 0644,
 873                 .proc_handler   = &proc_dointvec,
 874         },
 875         {
 876                 .ctl_name       = VM_PAGE_CLUSTER,
 877                 .procname       = "page-cluster",
 878                 .data           = &page_cluster,
 879                 .maxlen         = sizeof(int),
 880                 .mode           = 0644,
 881                 .proc_handler   = &proc_dointvec,
 882         },
 883         {
 884                 .ctl_name       = VM_DIRTY_BACKGROUND,
 885                 .procname       = "dirty_background_ratio",
 886                 .data           = &dirty_background_ratio,
 887                 .maxlen         = sizeof(dirty_background_ratio),
 888                 .mode           = 0644,
 889                 .proc_handler   = &proc_dointvec_minmax,
 890                 .strategy       = &sysctl_intvec,
 891                 .extra1         = &zero,
 892                 .extra2         = &one_hundred,
 893         },
 894         {
 895                 .ctl_name       = VM_DIRTY_RATIO,
 896                 .procname       = "dirty_ratio",
 897                 .data           = &vm_dirty_ratio,
 898                 .maxlen         = sizeof(vm_dirty_ratio),
 899                 .mode           = 0644,
 900                 .proc_handler   = &dirty_ratio_handler,
 901                 .strategy       = &sysctl_intvec,
 902                 .extra1         = &zero,
 903                 .extra2         = &one_hundred,
 904         },
 905         {
 906                 .procname       = "dirty_writeback_centisecs",
 907                 .data           = &dirty_writeback_interval,
 908                 .maxlen         = sizeof(dirty_writeback_interval),
 909                 .mode           = 0644,
 910                 .proc_handler   = &dirty_writeback_centisecs_handler,
 911         },
 912         {
 913                 .procname       = "dirty_expire_centisecs",
 914                 .data           = &dirty_expire_interval,
 915                 .maxlen         = sizeof(dirty_expire_interval),
 916                 .mode           = 0644,
 917                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 918         },
 919         {
 920                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 921                 .procname       = "nr_pdflush_threads",
 922                 .data           = &nr_pdflush_threads,
 923                 .maxlen         = sizeof nr_pdflush_threads,
 924                 .mode           = 0444 /* read-only*/,
 925                 .proc_handler   = &proc_dointvec,
 926         },
 927         {
 928                 .ctl_name       = VM_SWAPPINESS,
 929                 .procname       = "swappiness",
 930                 .data           = &vm_swappiness,
 931                 .maxlen         = sizeof(vm_swappiness),
 932                 .mode           = 0644,
 933                 .proc_handler   = &proc_dointvec_minmax,
 934                 .strategy       = &sysctl_intvec,
 935                 .extra1         = &zero,
 936                 .extra2         = &one_hundred,
 937         },
 938 #ifdef CONFIG_HUGETLB_PAGE
 939          {
 940                 .procname       = "nr_hugepages",
 941                 .data           = &max_huge_pages,
 942                 .maxlen         = sizeof(unsigned long),
 943                 .mode           = 0644,
 944                 .proc_handler   = &hugetlb_sysctl_handler,
 945                 .extra1         = (void *)&hugetlb_zero,
 946                 .extra2         = (void *)&hugetlb_infinity,
 947          },
 948          {
 949                 .ctl_name       = VM_HUGETLB_GROUP,
 950                 .procname       = "hugetlb_shm_group",
 951                 .data           = &sysctl_hugetlb_shm_group,
 952                 .maxlen         = sizeof(gid_t),
 953                 .mode           = 0644,
 954                 .proc_handler   = &proc_dointvec,
 955          },
 956          {
 957                 .ctl_name       = CTL_UNNUMBERED,
 958                 .procname       = "hugepages_treat_as_movable",
 959                 .data           = &hugepages_treat_as_movable,
 960                 .maxlen         = sizeof(int),
 961                 .mode           = 0644,
 962                 .proc_handler   = &hugetlb_treat_movable_handler,
 963         },
 964         {
 965                 .ctl_name       = CTL_UNNUMBERED,
 966                 .procname       = "nr_overcommit_hugepages",
 967                 .data           = &sysctl_overcommit_huge_pages,
 968                 .maxlen         = sizeof(sysctl_overcommit_huge_pages),
 969                 .mode           = 0644,
 970                 .proc_handler   = &hugetlb_overcommit_handler,
 971         },
 972 #endif
 973         {
 974                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 975                 .procname       = "lowmem_reserve_ratio",
 976                 .data           = &sysctl_lowmem_reserve_ratio,
 977                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 978                 .mode           = 0644,
 979                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 980                 .strategy       = &sysctl_intvec,
 981         },
 982         {
 983                 .ctl_name       = VM_DROP_PAGECACHE,
 984                 .procname       = "drop_caches",
 985                 .data           = &sysctl_drop_caches,
 986                 .maxlen         = sizeof(int),
 987                 .mode           = 0644,
 988                 .proc_handler   = drop_caches_sysctl_handler,
 989                 .strategy       = &sysctl_intvec,
 990         },
 991         {
 992                 .ctl_name       = VM_MIN_FREE_KBYTES,
 993                 .procname       = "min_free_kbytes",
 994                 .data           = &min_free_kbytes,
 995                 .maxlen         = sizeof(min_free_kbytes),
 996                 .mode           = 0644,
 997                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 998                 .strategy       = &sysctl_intvec,
 999                 .extra1         = &zero,
1000         },
1001         {
1002                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1003                 .procname       = "percpu_pagelist_fraction",
1004                 .data           = &percpu_pagelist_fraction,
1005                 .maxlen         = sizeof(percpu_pagelist_fraction),
1006                 .mode           = 0644,
1007                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1008                 .strategy       = &sysctl_intvec,
1009                 .extra1         = &min_percpu_pagelist_fract,
1010         },
1011 #ifdef CONFIG_MMU
1012         {
1013                 .ctl_name       = VM_MAX_MAP_COUNT,
1014                 .procname       = "max_map_count",
1015                 .data           = &sysctl_max_map_count,
1016                 .maxlen         = sizeof(sysctl_max_map_count),
1017                 .mode           = 0644,
1018                 .proc_handler   = &proc_dointvec
1019         },
1020 #endif
1021         {
1022                 .ctl_name       = VM_LAPTOP_MODE,
1023                 .procname       = "laptop_mode",
1024                 .data           = &laptop_mode,
1025                 .maxlen         = sizeof(laptop_mode),
1026                 .mode           = 0644,
1027                 .proc_handler   = &proc_dointvec_jiffies,
1028                 .strategy       = &sysctl_jiffies,
1029         },
1030         {
1031                 .ctl_name       = VM_BLOCK_DUMP,
1032                 .procname       = "block_dump",
1033                 .data           = &block_dump,
1034                 .maxlen         = sizeof(block_dump),
1035                 .mode           = 0644,
1036                 .proc_handler   = &proc_dointvec,
1037                 .strategy       = &sysctl_intvec,
1038                 .extra1         = &zero,
1039         },
1040         {
1041                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1042                 .procname       = "vfs_cache_pressure",
1043                 .data           = &sysctl_vfs_cache_pressure,
1044                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1045                 .mode           = 0644,
1046                 .proc_handler   = &proc_dointvec,
1047                 .strategy       = &sysctl_intvec,
1048                 .extra1         = &zero,
1049         },
1050 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1051         {
1052                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1053                 .procname       = "legacy_va_layout",
1054                 .data           = &sysctl_legacy_va_layout,
1055                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1056                 .mode           = 0644,
1057                 .proc_handler   = &proc_dointvec,
1058                 .strategy       = &sysctl_intvec,
1059                 .extra1         = &zero,
1060         },
1061 #endif
1062 #ifdef CONFIG_NUMA
1063         {
1064                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1065                 .procname       = "zone_reclaim_mode",
1066                 .data           = &zone_reclaim_mode,
1067                 .maxlen         = sizeof(zone_reclaim_mode),
1068                 .mode           = 0644,
1069                 .proc_handler   = &proc_dointvec,
1070                 .strategy       = &sysctl_intvec,
1071                 .extra1         = &zero,
1072         },
1073         {
1074                 .ctl_name       = VM_MIN_UNMAPPED,
1075                 .procname       = "min_unmapped_ratio",
1076                 .data           = &sysctl_min_unmapped_ratio,
1077                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1078                 .mode           = 0644,
1079                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1080                 .strategy       = &sysctl_intvec,
1081                 .extra1         = &zero,
1082                 .extra2         = &one_hundred,
1083         },
1084         {
1085                 .ctl_name       = VM_MIN_SLAB,
1086                 .procname       = "min_slab_ratio",
1087                 .data           = &sysctl_min_slab_ratio,
1088                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1089                 .mode           = 0644,
1090                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1091                 .strategy       = &sysctl_intvec,
1092                 .extra1         = &zero,
1093                 .extra2         = &one_hundred,
1094         },
1095 #endif
1096 #ifdef CONFIG_SMP
1097         {
1098                 .ctl_name       = CTL_UNNUMBERED,
1099                 .procname       = "stat_interval",
1100                 .data           = &sysctl_stat_interval,
1101                 .maxlen         = sizeof(sysctl_stat_interval),
1102                 .mode           = 0644,
1103                 .proc_handler   = &proc_dointvec_jiffies,
1104                 .strategy       = &sysctl_jiffies,
1105         },
1106 #endif
1107 #ifdef CONFIG_SECURITY
1108         {
1109                 .ctl_name       = CTL_UNNUMBERED,
1110                 .procname       = "mmap_min_addr",
1111                 .data           = &mmap_min_addr,
1112                 .maxlen         = sizeof(unsigned long),
1113                 .mode           = 0644,
1114                 .proc_handler   = &proc_doulongvec_minmax,
1115         },
1116 #endif
1117 #ifdef CONFIG_NUMA
1118         {
1119                 .ctl_name       = CTL_UNNUMBERED,
1120                 .procname       = "numa_zonelist_order",
1121                 .data           = &numa_zonelist_order,
1122                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1123                 .mode           = 0644,
1124                 .proc_handler   = &numa_zonelist_order_handler,
1125                 .strategy       = &sysctl_string,
1126         },
1127 #endif
1128 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1129    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1130         {
1131                 .ctl_name       = VM_VDSO_ENABLED,
1132                 .procname       = "vdso_enabled",
1133                 .data           = &vdso_enabled,
1134                 .maxlen         = sizeof(vdso_enabled),
1135                 .mode           = 0644,
1136                 .proc_handler   = &proc_dointvec,
1137                 .strategy       = &sysctl_intvec,
1138                 .extra1         = &zero,
1139         },
1140 #endif
1141 #ifdef CONFIG_HIGHMEM
1142         {
1143                 .ctl_name       = CTL_UNNUMBERED,
1144                 .procname       = "highmem_is_dirtyable",
1145                 .data           = &vm_highmem_is_dirtyable,
1146                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1147                 .mode           = 0644,
1148                 .proc_handler   = &proc_dointvec_minmax,
1149                 .strategy       = &sysctl_intvec,
1150                 .extra1         = &zero,
1151                 .extra2         = &one,
1152         },
1153 #endif
1154 /*
1155  * NOTE: do not add new entries to this table unless you have read
1156  * Documentation/sysctl/ctl_unnumbered.txt
1157  */
1158         { .ctl_name = 0 }
1159 };
1160
1161 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1162 static struct ctl_table binfmt_misc_table[] = {
1163         { .ctl_name = 0 }
1164 };
1165 #endif
1166
1167 static struct ctl_table fs_table[] = {
1168         {
1169                 .ctl_name       = FS_NRINODE,
1170                 .procname       = "inode-nr",
1171                 .data           = &inodes_stat,
1172                 .maxlen         = 2*sizeof(int),
1173                 .mode           = 0444,
1174                 .proc_handler   = &proc_dointvec,
1175         },
1176         {
1177                 .ctl_name       = FS_STATINODE,
1178                 .procname       = "inode-state",
1179                 .data           = &inodes_stat,
1180                 .maxlen         = 7*sizeof(int),
1181                 .mode           = 0444,
1182                 .proc_handler   = &proc_dointvec,
1183         },
1184         {
1185                 .procname       = "file-nr",
1186                 .data           = &files_stat,
1187                 .maxlen         = 3*sizeof(int),
1188                 .mode           = 0444,
1189                 .proc_handler   = &proc_nr_files,
1190         },
1191         {
1192                 .ctl_name       = FS_MAXFILE,
1193                 .procname       = "file-max",
1194                 .data           = &files_stat.max_files,
1195                 .maxlen         = sizeof(int),
1196                 .mode           = 0644,
1197                 .proc_handler   = &proc_dointvec,
1198         },
1199         {
1200                 .ctl_name       = CTL_UNNUMBERED,
1201                 .procname       = "nr_open",
1202                 .data           = &sysctl_nr_open,
1203                 .maxlen         = sizeof(int),
1204                 .mode           = 0644,
1205                 .proc_handler   = &proc_dointvec_minmax,
1206                 .extra1         = &sysctl_nr_open_min,
1207                 .extra2         = &sysctl_nr_open_max,
1208         },
1209         {
1210                 .ctl_name       = FS_DENTRY,
1211                 .procname       = "dentry-state",
1212                 .data           = &dentry_stat,
1213                 .maxlen         = 6*sizeof(int),
1214                 .mode           = 0444,
1215                 .proc_handler   = &proc_dointvec,
1216         },
1217         {
1218                 .ctl_name       = FS_OVERFLOWUID,
1219                 .procname       = "overflowuid",
1220                 .data           = &fs_overflowuid,
1221                 .maxlen         = sizeof(int),
1222                 .mode           = 0644,
1223                 .proc_handler   = &proc_dointvec_minmax,
1224                 .strategy       = &sysctl_intvec,
1225                 .extra1         = &minolduid,
1226                 .extra2         = &maxolduid,
1227         },
1228         {
1229                 .ctl_name       = FS_OVERFLOWGID,
1230                 .procname       = "overflowgid",
1231                 .data           = &fs_overflowgid,
1232                 .maxlen         = sizeof(int),
1233                 .mode           = 0644,
1234                 .proc_handler   = &proc_dointvec_minmax,
1235                 .strategy       = &sysctl_intvec,
1236                 .extra1         = &minolduid,
1237                 .extra2         = &maxolduid,
1238         },
1239         {
1240                 .ctl_name       = FS_LEASES,
1241                 .procname       = "leases-enable",
1242                 .data           = &leases_enable,
1243                 .maxlen         = sizeof(int),
1244                 .mode           = 0644,
1245                 .proc_handler   = &proc_dointvec,
1246         },
1247 #ifdef CONFIG_DNOTIFY
1248         {
1249                 .ctl_name       = FS_DIR_NOTIFY,
1250                 .procname       = "dir-notify-enable",
1251                 .data           = &dir_notify_enable,
1252                 .maxlen         = sizeof(int),
1253                 .mode           = 0644,
1254                 .proc_handler   = &proc_dointvec,
1255         },
1256 #endif
1257 #ifdef CONFIG_MMU
1258         {
1259                 .ctl_name       = FS_LEASE_TIME,
1260                 .procname       = "lease-break-time",
1261                 .data           = &lease_break_time,
1262                 .maxlen         = sizeof(int),
1263                 .mode           = 0644,
1264                 .proc_handler   = &proc_dointvec_minmax,
1265                 .strategy       = &sysctl_intvec,
1266                 .extra1         = &zero,
1267                 .extra2         = &two,
1268         },
1269         {
1270                 .procname       = "aio-nr",
1271                 .data           = &aio_nr,
1272                 .maxlen         = sizeof(aio_nr),
1273                 .mode           = 0444,
1274                 .proc_handler   = &proc_doulongvec_minmax,
1275         },
1276         {
1277                 .procname       = "aio-max-nr",
1278                 .data           = &aio_max_nr,
1279                 .maxlen         = sizeof(aio_max_nr),
1280                 .mode           = 0644,
1281                 .proc_handler   = &proc_doulongvec_minmax,
1282         },
1283 #ifdef CONFIG_INOTIFY_USER
1284         {
1285                 .ctl_name       = FS_INOTIFY,
1286                 .procname       = "inotify",
1287                 .mode           = 0555,
1288                 .child          = inotify_table,
1289         },
1290 #endif
1291 #endif
1292         {
1293                 .ctl_name       = KERN_SETUID_DUMPABLE,
1294                 .procname       = "suid_dumpable",
1295                 .data           = &suid_dumpable,
1296                 .maxlen         = sizeof(int),
1297                 .mode           = 0644,
1298                 .proc_handler   = &proc_dointvec,
1299         },
1300 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1301         {
1302                 .ctl_name       = CTL_UNNUMBERED,
1303                 .procname       = "binfmt_misc",
1304                 .mode           = 0555,
1305                 .child          = binfmt_misc_table,
1306         },
1307 #endif
1308 /*
1309  * NOTE: do not add new entries to this table unless you have read
1310  * Documentation/sysctl/ctl_unnumbered.txt
1311  */
1312         { .ctl_name = 0 }
1313 };
1314
1315 static struct ctl_table debug_table[] = {
1316 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1317         {
1318                 .ctl_name       = CTL_UNNUMBERED,
1319                 .procname       = "exception-trace",
1320                 .data           = &show_unhandled_signals,
1321                 .maxlen         = sizeof(int),
1322                 .mode           = 0644,
1323                 .proc_handler   = proc_dointvec
1324         },
1325 #endif
1326         { .ctl_name = 0 }
1327 };
1328
1329 static struct ctl_table dev_table[] = {
1330         { .ctl_name = 0 }
1331 };
1332
1333 static DEFINE_SPINLOCK(sysctl_lock);
1334
1335 /* called under sysctl_lock */
1336 static int use_table(struct ctl_table_header *p)
1337 {
1338         if (unlikely(p->unregistering))
1339                 return 0;
1340         p->used++;
1341         return 1;
1342 }
1343
1344 /* called under sysctl_lock */
1345 static void unuse_table(struct ctl_table_header *p)
1346 {
1347         if (!--p->used)
1348                 if (unlikely(p->unregistering))
1349                         complete(p->unregistering);
1350 }
1351
1352 /* called under sysctl_lock, will reacquire if has to wait */
1353 static void start_unregistering(struct ctl_table_header *p)
1354 {
1355         /*
1356          * if p->used is 0, nobody will ever touch that entry again;
1357          * we'll eliminate all paths to it before dropping sysctl_lock
1358          */
1359         if (unlikely(p->used)) {
1360                 struct completion wait;
1361                 init_completion(&wait);
1362                 p->unregistering = &wait;
1363                 spin_unlock(&sysctl_lock);
1364                 wait_for_completion(&wait);
1365                 spin_lock(&sysctl_lock);
1366         }
1367         /*
1368          * do not remove from the list until nobody holds it; walking the
1369          * list in do_sysctl() relies on that.
1370          */
1371         list_del_init(&p->ctl_entry);
1372 }
1373
1374 void sysctl_head_finish(struct ctl_table_header *head)
1375 {
1376         if (!head)
1377                 return;
1378         spin_lock(&sysctl_lock);
1379         unuse_table(head);
1380         spin_unlock(&sysctl_lock);
1381 }
1382
1383 static struct list_head *
1384 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1385 {
1386         struct list_head *header_list;
1387         header_list = &root->header_list;
1388         if (root->lookup)
1389                 header_list = root->lookup(root, namespaces);
1390         return header_list;
1391 }
1392
1393 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1394                                             struct ctl_table_header *prev)
1395 {
1396         struct ctl_table_root *root;
1397         struct list_head *header_list;
1398         struct ctl_table_header *head;
1399         struct list_head *tmp;
1400
1401         spin_lock(&sysctl_lock);
1402         if (prev) {
1403                 head = prev;
1404                 tmp = &prev->ctl_entry;
1405                 unuse_table(prev);
1406                 goto next;
1407         }
1408         tmp = &root_table_header.ctl_entry;
1409         for (;;) {
1410                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1411
1412                 if (!use_table(head))
1413                         goto next;
1414                 spin_unlock(&sysctl_lock);
1415                 return head;
1416         next:
1417                 root = head->root;
1418                 tmp = tmp->next;
1419                 header_list = lookup_header_list(root, namespaces);
1420                 if (tmp != header_list)
1421                         continue;
1422
1423                 do {
1424                         root = list_entry(root->root_list.next,
1425                                         struct ctl_table_root, root_list);
1426                         if (root == &sysctl_table_root)
1427                                 goto out;
1428                         header_list = lookup_header_list(root, namespaces);
1429                 } while (list_empty(header_list));
1430                 tmp = header_list->next;
1431         }
1432 out:
1433         spin_unlock(&sysctl_lock);
1434         return NULL;
1435 }
1436
1437 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1438 {
1439         return __sysctl_head_next(current->nsproxy, prev);
1440 }
1441
1442 void register_sysctl_root(struct ctl_table_root *root)
1443 {
1444         spin_lock(&sysctl_lock);
1445         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1446         spin_unlock(&sysctl_lock);
1447 }
1448
1449 #ifdef CONFIG_SYSCTL_SYSCALL
1450 /* Perform the actual read/write of a sysctl table entry. */
1451 static int do_sysctl_strategy(struct ctl_table_root *root,
1452                         struct ctl_table *table,
1453                         int __user *name, int nlen,
1454                         void __user *oldval, size_t __user *oldlenp,
1455                         void __user *newval, size_t newlen)
1456 {
1457         int op = 0, rc;
1458
1459         if (oldval)
1460                 op |= 004;
1461         if (newval)
1462                 op |= 002;
1463         if (sysctl_perm(root, table, op))
1464                 return -EPERM;
1465
1466         if (table->strategy) {
1467                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1468                                      newval, newlen);
1469                 if (rc < 0)
1470                         return rc;
1471                 if (rc > 0)
1472                         return 0;
1473         }
1474
1475         /* If there is no strategy routine, or if the strategy returns
1476          * zero, proceed with automatic r/w */
1477         if (table->data && table->maxlen) {
1478                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1479                                  newval, newlen);
1480                 if (rc < 0)
1481                         return rc;
1482         }
1483         return 0;
1484 }
1485
1486 static int parse_table(int __user *name, int nlen,
1487                        void __user *oldval, size_t __user *oldlenp,
1488                        void __user *newval, size_t newlen,
1489                        struct ctl_table_root *root,
1490                        struct ctl_table *table)
1491 {
1492         int n;
1493 repeat:
1494         if (!nlen)
1495                 return -ENOTDIR;
1496         if (get_user(n, name))
1497                 return -EFAULT;
1498         for ( ; table->ctl_name || table->procname; table++) {
1499                 if (!table->ctl_name)
1500                         continue;
1501                 if (n == table->ctl_name) {
1502                         int error;
1503                         if (table->child) {
1504                                 if (sysctl_perm(root, table, 001))
1505                                         return -EPERM;
1506                                 name++;
1507                                 nlen--;
1508                                 table = table->child;
1509                                 goto repeat;
1510                         }
1511                         error = do_sysctl_strategy(root, table, name, nlen,
1512                                                    oldval, oldlenp,
1513                                                    newval, newlen);
1514                         return error;
1515                 }
1516         }
1517         return -ENOTDIR;
1518 }
1519
1520 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1521                void __user *newval, size_t newlen)
1522 {
1523         struct ctl_table_header *head;
1524         int error = -ENOTDIR;
1525
1526         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1527                 return -ENOTDIR;
1528         if (oldval) {
1529                 int old_len;
1530                 if (!oldlenp || get_user(old_len, oldlenp))
1531                         return -EFAULT;
1532         }
1533
1534         for (head = sysctl_head_next(NULL); head;
1535                         head = sysctl_head_next(head)) {
1536                 error = parse_table(name, nlen, oldval, oldlenp,
1537                                         newval, newlen,
1538                                         head->root, head->ctl_table);
1539                 if (error != -ENOTDIR) {
1540                         sysctl_head_finish(head);
1541                         break;
1542                 }
1543         }
1544         return error;
1545 }
1546
1547 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1548 {
1549         struct __sysctl_args tmp;
1550         int error;
1551
1552         if (copy_from_user(&tmp, args, sizeof(tmp)))
1553                 return -EFAULT;
1554
1555         error = deprecated_sysctl_warning(&tmp);
1556         if (error)
1557                 goto out;
1558
1559         lock_kernel();
1560         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1561                           tmp.newval, tmp.newlen);
1562         unlock_kernel();
1563 out:
1564         return error;
1565 }
1566 #endif /* CONFIG_SYSCTL_SYSCALL */
1567
1568 /*
1569  * sysctl_perm does NOT grant the superuser all rights automatically, because
1570  * some sysctl variables are readonly even to root.
1571  */
1572
1573 static int test_perm(int mode, int op)
1574 {
1575         if (!current->euid)
1576                 mode >>= 6;
1577         else if (in_egroup_p(0))
1578                 mode >>= 3;
1579         if ((mode & op & 0007) == op)
1580                 return 0;
1581         return -EACCES;
1582 }
1583
1584 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1585 {
1586         int error;
1587         int mode;
1588
1589         error = security_sysctl(table, op);
1590         if (error)
1591                 return error;
1592
1593         if (root->permissions)
1594                 mode = root->permissions(root, current->nsproxy, table);
1595         else
1596                 mode = table->mode;
1597
1598         return test_perm(mode, op);
1599 }
1600
1601 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1602 {
1603         for (; table->ctl_name || table->procname; table++) {
1604                 table->parent = parent;
1605                 if (table->child)
1606                         sysctl_set_parent(table, table->child);
1607         }
1608 }
1609
1610 static __init int sysctl_init(void)
1611 {
1612         sysctl_set_parent(NULL, root_table);
1613 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1614         {
1615                 int err;
1616                 err = sysctl_check_table(current->nsproxy, root_table);
1617         }
1618 #endif
1619         return 0;
1620 }
1621
1622 core_initcall(sysctl_init);
1623
1624 /**
1625  * __register_sysctl_paths - register a sysctl hierarchy
1626  * @root: List of sysctl headers to register on
1627  * @namespaces: Data to compute which lists of sysctl entries are visible
1628  * @path: The path to the directory the sysctl table is in.
1629  * @table: the top-level table structure
1630  *
1631  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1632  * array. A completely 0 filled entry terminates the table.
1633  *
1634  * The members of the &struct ctl_table structure are used as follows:
1635  *
1636  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1637  *            must be unique within that level of sysctl
1638  *
1639  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1640  *            enter a sysctl file
1641  *
1642  * data - a pointer to data for use by proc_handler
1643  *
1644  * maxlen - the maximum size in bytes of the data
1645  *
1646  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1647  *
1648  * child - a pointer to the child sysctl table if this entry is a directory, or
1649  *         %NULL.
1650  *
1651  * proc_handler - the text handler routine (described below)
1652  *
1653  * strategy - the strategy routine (described below)
1654  *
1655  * de - for internal use by the sysctl routines
1656  *
1657  * extra1, extra2 - extra pointers usable by the proc handler routines
1658  *
1659  * Leaf nodes in the sysctl tree will be represented by a single file
1660  * under /proc; non-leaf nodes will be represented by directories.
1661  *
1662  * sysctl(2) can automatically manage read and write requests through
1663  * the sysctl table.  The data and maxlen fields of the ctl_table
1664  * struct enable minimal validation of the values being written to be
1665  * performed, and the mode field allows minimal authentication.
1666  *
1667  * More sophisticated management can be enabled by the provision of a
1668  * strategy routine with the table entry.  This will be called before
1669  * any automatic read or write of the data is performed.
1670  *
1671  * The strategy routine may return
1672  *
1673  * < 0 - Error occurred (error is passed to user process)
1674  *
1675  * 0   - OK - proceed with automatic read or write.
1676  *
1677  * > 0 - OK - read or write has been done by the strategy routine, so
1678  *       return immediately.
1679  *
1680  * There must be a proc_handler routine for any terminal nodes
1681  * mirrored under /proc/sys (non-terminals are handled by a built-in
1682  * directory handler).  Several default handlers are available to
1683  * cover common cases -
1684  *
1685  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1686  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1687  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1688  *
1689  * It is the handler's job to read the input buffer from user memory
1690  * and process it. The handler should return 0 on success.
1691  *
1692  * This routine returns %NULL on a failure to register, and a pointer
1693  * to the table header on success.
1694  */
1695 struct ctl_table_header *__register_sysctl_paths(
1696         struct ctl_table_root *root,
1697         struct nsproxy *namespaces,
1698         const struct ctl_path *path, struct ctl_table *table)
1699 {
1700         struct list_head *header_list;
1701         struct ctl_table_header *header;
1702         struct ctl_table *new, **prevp;
1703         unsigned int n, npath;
1704
1705         /* Count the path components */
1706         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1707                 ;
1708
1709         /*
1710          * For each path component, allocate a 2-element ctl_table array.
1711          * The first array element will be filled with the sysctl entry
1712          * for this, the second will be the sentinel (ctl_name == 0).
1713          *
1714          * We allocate everything in one go so that we don't have to
1715          * worry about freeing additional memory in unregister_sysctl_table.
1716          */
1717         header = kzalloc(sizeof(struct ctl_table_header) +
1718                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1719         if (!header)
1720                 return NULL;
1721
1722         new = (struct ctl_table *) (header + 1);
1723
1724         /* Now connect the dots */
1725         prevp = &header->ctl_table;
1726         for (n = 0; n < npath; ++n, ++path) {
1727                 /* Copy the procname */
1728                 new->procname = path->procname;
1729                 new->ctl_name = path->ctl_name;
1730                 new->mode     = 0555;
1731
1732                 *prevp = new;
1733                 prevp = &new->child;
1734
1735                 new += 2;
1736         }
1737         *prevp = table;
1738         header->ctl_table_arg = table;
1739
1740         INIT_LIST_HEAD(&header->ctl_entry);
1741         header->used = 0;
1742         header->unregistering = NULL;
1743         header->root = root;
1744         sysctl_set_parent(NULL, header->ctl_table);
1745 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1746         if (sysctl_check_table(namespaces, header->ctl_table)) {
1747                 kfree(header);
1748                 return NULL;
1749         }
1750 #endif
1751         spin_lock(&sysctl_lock);
1752         header_list = lookup_header_list(root, namespaces);
1753         list_add_tail(&header->ctl_entry, header_list);
1754         spin_unlock(&sysctl_lock);
1755
1756         return header;
1757 }
1758
1759 /**
1760  * register_sysctl_table_path - register a sysctl table hierarchy
1761  * @path: The path to the directory the sysctl table is in.
1762  * @table: the top-level table structure
1763  *
1764  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1765  * array. A completely 0 filled entry terminates the table.
1766  *
1767  * See __register_sysctl_paths for more details.
1768  */
1769 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1770                                                 struct ctl_table *table)
1771 {
1772         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1773                                         path, table);
1774 }
1775
1776 /**
1777  * register_sysctl_table - register a sysctl table hierarchy
1778  * @table: the top-level table structure
1779  *
1780  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1781  * array. A completely 0 filled entry terminates the table.
1782  *
1783  * See register_sysctl_paths for more details.
1784  */
1785 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1786 {
1787         static const struct ctl_path null_path[] = { {} };
1788
1789         return register_sysctl_paths(null_path, table);
1790 }
1791
1792 /**
1793  * unregister_sysctl_table - unregister a sysctl table hierarchy
1794  * @header: the header returned from register_sysctl_table
1795  *
1796  * Unregisters the sysctl table and all children. proc entries may not
1797  * actually be removed until they are no longer used by anyone.
1798  */
1799 void unregister_sysctl_table(struct ctl_table_header * header)
1800 {
1801         might_sleep();
1802
1803         if (header == NULL)
1804                 return;
1805
1806         spin_lock(&sysctl_lock);
1807         start_unregistering(header);
1808         spin_unlock(&sysctl_lock);
1809         kfree(header);
1810 }
1811
1812 #else /* !CONFIG_SYSCTL */
1813 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1814 {
1815         return NULL;
1816 }
1817
1818 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1819                                                     struct ctl_table *table)
1820 {
1821         return NULL;
1822 }
1823
1824 void unregister_sysctl_table(struct ctl_table_header * table)
1825 {
1826 }
1827
1828 #endif /* CONFIG_SYSCTL */
1829
1830 /*
1831  * /proc/sys support
1832  */
1833
1834 #ifdef CONFIG_PROC_SYSCTL
1835
1836 static int _proc_do_string(void* data, int maxlen, int write,
1837                            struct file *filp, void __user *buffer,
1838                            size_t *lenp, loff_t *ppos)
1839 {
1840         size_t len;
1841         char __user *p;
1842         char c;
1843
1844         if (!data || !maxlen || !*lenp) {
1845                 *lenp = 0;
1846                 return 0;
1847         }
1848
1849         if (write) {
1850                 len = 0;
1851                 p = buffer;
1852                 while (len < *lenp) {
1853                         if (get_user(c, p++))
1854                                 return -EFAULT;
1855                         if (c == 0 || c == '\n')
1856                                 break;
1857                         len++;
1858                 }
1859                 if (len >= maxlen)
1860                         len = maxlen-1;
1861                 if(copy_from_user(data, buffer, len))
1862                         return -EFAULT;
1863                 ((char *) data)[len] = 0;
1864                 *ppos += *lenp;
1865         } else {
1866                 len = strlen(data);
1867                 if (len > maxlen)
1868                         len = maxlen;
1869
1870                 if (*ppos > len) {
1871                         *lenp = 0;
1872                         return 0;
1873                 }
1874
1875                 data += *ppos;
1876                 len  -= *ppos;
1877
1878                 if (len > *lenp)
1879                         len = *lenp;
1880                 if (len)
1881                         if(copy_to_user(buffer, data, len))
1882                                 return -EFAULT;
1883                 if (len < *lenp) {
1884                         if(put_user('\n', ((char __user *) buffer) + len))
1885                                 return -EFAULT;
1886                         len++;
1887                 }
1888                 *lenp = len;
1889                 *ppos += len;
1890         }
1891         return 0;
1892 }
1893
1894 /**
1895  * proc_dostring - read a string sysctl
1896  * @table: the sysctl table
1897  * @write: %TRUE if this is a write to the sysctl file
1898  * @filp: the file structure
1899  * @buffer: the user buffer
1900  * @lenp: the size of the user buffer
1901  * @ppos: file position
1902  *
1903  * Reads/writes a string from/to the user buffer. If the kernel
1904  * buffer provided is not large enough to hold the string, the
1905  * string is truncated. The copied string is %NULL-terminated.
1906  * If the string is being read by the user process, it is copied
1907  * and a newline '\n' is added. It is truncated if the buffer is
1908  * not large enough.
1909  *
1910  * Returns 0 on success.
1911  */
1912 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1913                   void __user *buffer, size_t *lenp, loff_t *ppos)
1914 {
1915         return _proc_do_string(table->data, table->maxlen, write, filp,
1916                                buffer, lenp, ppos);
1917 }
1918
1919
1920 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1921                                  int *valp,
1922                                  int write, void *data)
1923 {
1924         if (write) {
1925                 *valp = *negp ? -*lvalp : *lvalp;
1926         } else {
1927                 int val = *valp;
1928                 if (val < 0) {
1929                         *negp = -1;
1930                         *lvalp = (unsigned long)-val;
1931                 } else {
1932                         *negp = 0;
1933                         *lvalp = (unsigned long)val;
1934                 }
1935         }
1936         return 0;
1937 }
1938
1939 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1940                   int write, struct file *filp, void __user *buffer,
1941                   size_t *lenp, loff_t *ppos,
1942                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1943                               int write, void *data),
1944                   void *data)
1945 {
1946 #define TMPBUFLEN 21
1947         int *i, vleft, first=1, neg, val;
1948         unsigned long lval;
1949         size_t left, len;
1950
1951         char buf[TMPBUFLEN], *p;
1952         char __user *s = buffer;
1953
1954         if (!tbl_data || !table->maxlen || !*lenp ||
1955             (*ppos && !write)) {
1956                 *lenp = 0;
1957                 return 0;
1958         }
1959
1960         i = (int *) tbl_data;
1961         vleft = table->maxlen / sizeof(*i);
1962         left = *lenp;
1963
1964         if (!conv)
1965                 conv = do_proc_dointvec_conv;
1966
1967         for (; left && vleft--; i++, first=0) {
1968                 if (write) {
1969                         while (left) {
1970                                 char c;
1971                                 if (get_user(c, s))
1972                                         return -EFAULT;
1973                                 if (!isspace(c))
1974                                         break;
1975                                 left--;
1976                                 s++;
1977                         }
1978                         if (!left)
1979                                 break;
1980                         neg = 0;
1981                         len = left;
1982                         if (len > sizeof(buf) - 1)
1983                                 len = sizeof(buf) - 1;
1984                         if (copy_from_user(buf, s, len))
1985                                 return -EFAULT;
1986                         buf[len] = 0;
1987                         p = buf;
1988                         if (*p == '-' && left > 1) {
1989                                 neg = 1;
1990                                 p++;
1991                         }
1992                         if (*p < '0' || *p > '9')
1993                                 break;
1994
1995                         lval = simple_strtoul(p, &p, 0);
1996
1997                         len = p-buf;
1998                         if ((len < left) && *p && !isspace(*p))
1999                                 break;
2000                         if (neg)
2001                                 val = -val;
2002                         s += len;
2003                         left -= len;
2004
2005                         if (conv(&neg, &lval, i, 1, data))
2006                                 break;
2007                 } else {
2008                         p = buf;
2009                         if (!first)
2010                                 *p++ = '\t';
2011
2012                         if (conv(&neg, &lval, i, 0, data))
2013                                 break;
2014
2015                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2016                         len = strlen(buf);
2017                         if (len > left)
2018                                 len = left;
2019                         if(copy_to_user(s, buf, len))
2020                                 return -EFAULT;
2021                         left -= len;
2022                         s += len;
2023                 }
2024         }
2025
2026         if (!write && !first && left) {
2027                 if(put_user('\n', s))
2028                         return -EFAULT;
2029                 left--, s++;
2030         }
2031         if (write) {
2032                 while (left) {
2033                         char c;
2034                         if (get_user(c, s++))
2035                                 return -EFAULT;
2036                         if (!isspace(c))
2037                                 break;
2038                         left--;
2039                 }
2040         }
2041         if (write && first)
2042                 return -EINVAL;
2043         *lenp -= left;
2044         *ppos += *lenp;
2045         return 0;
2046 #undef TMPBUFLEN
2047 }
2048
2049 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2050                   void __user *buffer, size_t *lenp, loff_t *ppos,
2051                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2052                               int write, void *data),
2053                   void *data)
2054 {
2055         return __do_proc_dointvec(table->data, table, write, filp,
2056                         buffer, lenp, ppos, conv, data);
2057 }
2058
2059 /**
2060  * proc_dointvec - read a vector of integers
2061  * @table: the sysctl table
2062  * @write: %TRUE if this is a write to the sysctl file
2063  * @filp: the file structure
2064  * @buffer: the user buffer
2065  * @lenp: the size of the user buffer
2066  * @ppos: file position
2067  *
2068  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2069  * values from/to the user buffer, treated as an ASCII string.
2070  *
2071  * Returns 0 on success.
2072  */
2073 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2074                      void __user *buffer, size_t *lenp, loff_t *ppos)
2075 {
2076     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2077                             NULL,NULL);
2078 }
2079
2080 #define OP_SET  0
2081 #define OP_AND  1
2082 #define OP_OR   2
2083
2084 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2085                                       int *valp,
2086                                       int write, void *data)
2087 {
2088         int op = *(int *)data;
2089         if (write) {
2090                 int val = *negp ? -*lvalp : *lvalp;
2091                 switch(op) {
2092                 case OP_SET:    *valp = val; break;
2093                 case OP_AND:    *valp &= val; break;
2094                 case OP_OR:     *valp |= val; break;
2095                 }
2096         } else {
2097                 int val = *valp;
2098                 if (val < 0) {
2099                         *negp = -1;
2100                         *lvalp = (unsigned long)-val;
2101                 } else {
2102                         *negp = 0;
2103                         *lvalp = (unsigned long)val;
2104                 }
2105         }
2106         return 0;
2107 }
2108
2109 /*
2110  *      Taint values can only be increased
2111  */
2112 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2113                                void __user *buffer, size_t *lenp, loff_t *ppos)
2114 {
2115         int op;
2116
2117         if (write && !capable(CAP_SYS_ADMIN))
2118                 return -EPERM;
2119
2120         op = OP_OR;
2121         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2122                                 do_proc_dointvec_bset_conv,&op);
2123 }
2124
2125 struct do_proc_dointvec_minmax_conv_param {
2126         int *min;
2127         int *max;
2128 };
2129
2130 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2131                                         int *valp,
2132                                         int write, void *data)
2133 {
2134         struct do_proc_dointvec_minmax_conv_param *param = data;
2135         if (write) {
2136                 int val = *negp ? -*lvalp : *lvalp;
2137                 if ((param->min && *param->min > val) ||
2138                     (param->max && *param->max < val))
2139                         return -EINVAL;
2140                 *valp = val;
2141         } else {
2142                 int val = *valp;
2143                 if (val < 0) {
2144                         *negp = -1;
2145                         *lvalp = (unsigned long)-val;
2146                 } else {
2147                         *negp = 0;
2148                         *lvalp = (unsigned long)val;
2149                 }
2150         }
2151         return 0;
2152 }
2153
2154 /**
2155  * proc_dointvec_minmax - read a vector of integers with min/max values
2156  * @table: the sysctl table
2157  * @write: %TRUE if this is a write to the sysctl file
2158  * @filp: the file structure
2159  * @buffer: the user buffer
2160  * @lenp: the size of the user buffer
2161  * @ppos: file position
2162  *
2163  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2164  * values from/to the user buffer, treated as an ASCII string.
2165  *
2166  * This routine will ensure the values are within the range specified by
2167  * table->extra1 (min) and table->extra2 (max).
2168  *
2169  * Returns 0 on success.
2170  */
2171 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2172                   void __user *buffer, size_t *lenp, loff_t *ppos)
2173 {
2174         struct do_proc_dointvec_minmax_conv_param param = {
2175                 .min = (int *) table->extra1,
2176                 .max = (int *) table->extra2,
2177         };
2178         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2179                                 do_proc_dointvec_minmax_conv, &param);
2180 }
2181
2182 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2183                                      struct file *filp,
2184                                      void __user *buffer,
2185                                      size_t *lenp, loff_t *ppos,
2186                                      unsigned long convmul,
2187                                      unsigned long convdiv)
2188 {
2189 #define TMPBUFLEN 21
2190         unsigned long *i, *min, *max, val;
2191         int vleft, first=1, neg;
2192         size_t len, left;
2193         char buf[TMPBUFLEN], *p;
2194         char __user *s = buffer;
2195
2196         if (!data || !table->maxlen || !*lenp ||
2197             (*ppos && !write)) {
2198                 *lenp = 0;
2199                 return 0;
2200         }
2201
2202         i = (unsigned long *) data;
2203         min = (unsigned long *) table->extra1;
2204         max = (unsigned long *) table->extra2;
2205         vleft = table->maxlen / sizeof(unsigned long);
2206         left = *lenp;
2207
2208         for (; left && vleft--; i++, min++, max++, first=0) {
2209                 if (write) {
2210                         while (left) {
2211                                 char c;
2212                                 if (get_user(c, s))
2213                                         return -EFAULT;
2214                                 if (!isspace(c))
2215                                         break;
2216                                 left--;
2217                                 s++;
2218                         }
2219                         if (!left)
2220                                 break;
2221                         neg = 0;
2222                         len = left;
2223                         if (len > TMPBUFLEN-1)
2224                                 len = TMPBUFLEN-1;
2225                         if (copy_from_user(buf, s, len))
2226                                 return -EFAULT;
2227                         buf[len] = 0;
2228                         p = buf;
2229                         if (*p == '-' && left > 1) {
2230                                 neg = 1;
2231                                 p++;
2232                         }
2233                         if (*p < '0' || *p > '9')
2234                                 break;
2235                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2236                         len = p-buf;
2237                         if ((len < left) && *p && !isspace(*p))
2238                                 break;
2239                         if (neg)
2240                                 val = -val;
2241                         s += len;
2242                         left -= len;
2243
2244                         if(neg)
2245                                 continue;
2246                         if ((min && val < *min) || (max && val > *max))
2247                                 continue;
2248                         *i = val;
2249                 } else {
2250                         p = buf;
2251                         if (!first)
2252                                 *p++ = '\t';
2253                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2254                         len = strlen(buf);
2255                         if (len > left)
2256                                 len = left;
2257                         if(copy_to_user(s, buf, len))
2258                                 return -EFAULT;
2259                         left -= len;
2260                         s += len;
2261                 }
2262         }
2263
2264         if (!write && !first && left) {
2265                 if(put_user('\n', s))
2266                         return -EFAULT;
2267                 left--, s++;
2268         }
2269         if (write) {
2270                 while (left) {
2271                         char c;
2272                         if (get_user(c, s++))
2273                                 return -EFAULT;
2274                         if (!isspace(c))
2275                                 break;
2276                         left--;
2277                 }
2278         }
2279         if (write && first)
2280                 return -EINVAL;
2281         *lenp -= left;
2282         *ppos += *lenp;
2283         return 0;
2284 #undef TMPBUFLEN
2285 }
2286
2287 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2288                                      struct file *filp,
2289                                      void __user *buffer,
2290                                      size_t *lenp, loff_t *ppos,
2291                                      unsigned long convmul,
2292                                      unsigned long convdiv)
2293 {
2294         return __do_proc_doulongvec_minmax(table->data, table, write,
2295                         filp, buffer, lenp, ppos, convmul, convdiv);
2296 }
2297
2298 /**
2299  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2300  * @table: the sysctl table
2301  * @write: %TRUE if this is a write to the sysctl file
2302  * @filp: the file structure
2303  * @buffer: the user buffer
2304  * @lenp: the size of the user buffer
2305  * @ppos: file position
2306  *
2307  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2308  * values from/to the user buffer, treated as an ASCII string.
2309  *
2310  * This routine will ensure the values are within the range specified by
2311  * table->extra1 (min) and table->extra2 (max).
2312  *
2313  * Returns 0 on success.
2314  */
2315 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2316                            void __user *buffer, size_t *lenp, loff_t *ppos)
2317 {
2318     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2319 }
2320
2321 /**
2322  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2323  * @table: the sysctl table
2324  * @write: %TRUE if this is a write to the sysctl file
2325  * @filp: the file structure
2326  * @buffer: the user buffer
2327  * @lenp: the size of the user buffer
2328  * @ppos: file position
2329  *
2330  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2331  * values from/to the user buffer, treated as an ASCII string. The values
2332  * are treated as milliseconds, and converted to jiffies when they are stored.
2333  *
2334  * This routine will ensure the values are within the range specified by
2335  * table->extra1 (min) and table->extra2 (max).
2336  *
2337  * Returns 0 on success.
2338  */
2339 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2340                                       struct file *filp,
2341                                       void __user *buffer,
2342                                       size_t *lenp, loff_t *ppos)
2343 {
2344     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2345                                      lenp, ppos, HZ, 1000l);
2346 }
2347
2348
2349 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2350                                          int *valp,
2351                                          int write, void *data)
2352 {
2353         if (write) {
2354                 if (*lvalp > LONG_MAX / HZ)
2355                         return 1;
2356                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2357         } else {
2358                 int val = *valp;
2359                 unsigned long lval;
2360                 if (val < 0) {
2361                         *negp = -1;
2362                         lval = (unsigned long)-val;
2363                 } else {
2364                         *negp = 0;
2365                         lval = (unsigned long)val;
2366                 }
2367                 *lvalp = lval / HZ;
2368         }
2369         return 0;
2370 }
2371
2372 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2373                                                 int *valp,
2374                                                 int write, void *data)
2375 {
2376         if (write) {
2377                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2378                         return 1;
2379                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2380         } else {
2381                 int val = *valp;
2382                 unsigned long lval;
2383                 if (val < 0) {
2384                         *negp = -1;
2385                         lval = (unsigned long)-val;
2386                 } else {
2387                         *negp = 0;
2388                         lval = (unsigned long)val;
2389                 }
2390                 *lvalp = jiffies_to_clock_t(lval);
2391         }
2392         return 0;
2393 }
2394
2395 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2396                                             int *valp,
2397                                             int write, void *data)
2398 {
2399         if (write) {
2400                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2401         } else {
2402                 int val = *valp;
2403                 unsigned long lval;
2404                 if (val < 0) {
2405                         *negp = -1;
2406                         lval = (unsigned long)-val;
2407                 } else {
2408                         *negp = 0;
2409                         lval = (unsigned long)val;
2410                 }
2411                 *lvalp = jiffies_to_msecs(lval);
2412         }
2413         return 0;
2414 }
2415
2416 /**
2417  * proc_dointvec_jiffies - read a vector of integers as seconds
2418  * @table: the sysctl table
2419  * @write: %TRUE if this is a write to the sysctl file
2420  * @filp: the file structure
2421  * @buffer: the user buffer
2422  * @lenp: the size of the user buffer
2423  * @ppos: file position
2424  *
2425  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2426  * values from/to the user buffer, treated as an ASCII string.
2427  * The values read are assumed to be in seconds, and are converted into
2428  * jiffies.
2429  *
2430  * Returns 0 on success.
2431  */
2432 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2433                           void __user *buffer, size_t *lenp, loff_t *ppos)
2434 {
2435     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2436                             do_proc_dointvec_jiffies_conv,NULL);
2437 }
2438
2439 /**
2440  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2441  * @table: the sysctl table
2442  * @write: %TRUE if this is a write to the sysctl file
2443  * @filp: the file structure
2444  * @buffer: the user buffer
2445  * @lenp: the size of the user buffer
2446  * @ppos: pointer to the file position
2447  *
2448  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2449  * values from/to the user buffer, treated as an ASCII string.
2450  * The values read are assumed to be in 1/USER_HZ seconds, and
2451  * are converted into jiffies.
2452  *
2453  * Returns 0 on success.
2454  */
2455 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2456                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2457 {
2458     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2459                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2460 }
2461
2462 /**
2463  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2464  * @table: the sysctl table
2465  * @write: %TRUE if this is a write to the sysctl file
2466  * @filp: the file structure
2467  * @buffer: the user buffer
2468  * @lenp: the size of the user buffer
2469  * @ppos: file position
2470  * @ppos: the current position in the file
2471  *
2472  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2473  * values from/to the user buffer, treated as an ASCII string.
2474  * The values read are assumed to be in 1/1000 seconds, and
2475  * are converted into jiffies.
2476  *
2477  * Returns 0 on success.
2478  */
2479 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2480                              void __user *buffer, size_t *lenp, loff_t *ppos)
2481 {
2482         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2483                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2484 }
2485
2486 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2487                            void __user *buffer, size_t *lenp, loff_t *ppos)
2488 {
2489         struct pid *new_pid;
2490         pid_t tmp;
2491         int r;
2492
2493         tmp = pid_vnr(cad_pid);
2494
2495         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2496                                lenp, ppos, NULL, NULL);
2497         if (r || !write)
2498                 return r;
2499
2500         new_pid = find_get_pid(tmp);
2501         if (!new_pid)
2502                 return -ESRCH;
2503
2504         put_pid(xchg(&cad_pid, new_pid));
2505         return 0;
2506 }
2507
2508 #else /* CONFIG_PROC_FS */
2509
2510 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2511                   void __user *buffer, size_t *lenp, loff_t *ppos)
2512 {
2513         return -ENOSYS;
2514 }
2515
2516 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2517                   void __user *buffer, size_t *lenp, loff_t *ppos)
2518 {
2519         return -ENOSYS;
2520 }
2521
2522 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2523                     void __user *buffer, size_t *lenp, loff_t *ppos)
2524 {
2525         return -ENOSYS;
2526 }
2527
2528 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2529                     void __user *buffer, size_t *lenp, loff_t *ppos)
2530 {
2531         return -ENOSYS;
2532 }
2533
2534 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2535                     void __user *buffer, size_t *lenp, loff_t *ppos)
2536 {
2537         return -ENOSYS;
2538 }
2539
2540 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2541                              void __user *buffer, size_t *lenp, loff_t *ppos)
2542 {
2543         return -ENOSYS;
2544 }
2545
2546 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2547                     void __user *buffer, size_t *lenp, loff_t *ppos)
2548 {
2549         return -ENOSYS;
2550 }
2551
2552 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2553                                       struct file *filp,
2554                                       void __user *buffer,
2555                                       size_t *lenp, loff_t *ppos)
2556 {
2557     return -ENOSYS;
2558 }
2559
2560
2561 #endif /* CONFIG_PROC_FS */
2562
2563
2564 #ifdef CONFIG_SYSCTL_SYSCALL
2565 /*
2566  * General sysctl support routines
2567  */
2568
2569 /* The generic sysctl data routine (used if no strategy routine supplied) */
2570 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2571                 void __user *oldval, size_t __user *oldlenp,
2572                 void __user *newval, size_t newlen)
2573 {
2574         size_t len;
2575
2576         /* Get out of I don't have a variable */
2577         if (!table->data || !table->maxlen)
2578                 return -ENOTDIR;
2579
2580         if (oldval && oldlenp) {
2581                 if (get_user(len, oldlenp))
2582                         return -EFAULT;
2583                 if (len) {
2584                         if (len > table->maxlen)
2585                                 len = table->maxlen;
2586                         if (copy_to_user(oldval, table->data, len))
2587                                 return -EFAULT;
2588                         if (put_user(len, oldlenp))
2589                                 return -EFAULT;
2590                 }
2591         }
2592
2593         if (newval && newlen) {
2594                 if (newlen > table->maxlen)
2595                         newlen = table->maxlen;
2596
2597                 if (copy_from_user(table->data, newval, newlen))
2598                         return -EFAULT;
2599         }
2600         return 1;
2601 }
2602
2603 /* The generic string strategy routine: */
2604 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2605                   void __user *oldval, size_t __user *oldlenp,
2606                   void __user *newval, size_t newlen)
2607 {
2608         if (!table->data || !table->maxlen)
2609                 return -ENOTDIR;
2610
2611         if (oldval && oldlenp) {
2612                 size_t bufsize;
2613                 if (get_user(bufsize, oldlenp))
2614                         return -EFAULT;
2615                 if (bufsize) {
2616                         size_t len = strlen(table->data), copied;
2617
2618                         /* This shouldn't trigger for a well-formed sysctl */
2619                         if (len > table->maxlen)
2620                                 len = table->maxlen;
2621
2622                         /* Copy up to a max of bufsize-1 bytes of the string */
2623                         copied = (len >= bufsize) ? bufsize - 1 : len;
2624
2625                         if (copy_to_user(oldval, table->data, copied) ||
2626                             put_user(0, (char __user *)(oldval + copied)))
2627                                 return -EFAULT;
2628                         if (put_user(len, oldlenp))
2629                                 return -EFAULT;
2630                 }
2631         }
2632         if (newval && newlen) {
2633                 size_t len = newlen;
2634                 if (len > table->maxlen)
2635                         len = table->maxlen;
2636                 if(copy_from_user(table->data, newval, len))
2637                         return -EFAULT;
2638                 if (len == table->maxlen)
2639                         len--;
2640                 ((char *) table->data)[len] = 0;
2641         }
2642         return 1;
2643 }
2644
2645 /*
2646  * This function makes sure that all of the integers in the vector
2647  * are between the minimum and maximum values given in the arrays
2648  * table->extra1 and table->extra2, respectively.
2649  */
2650 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2651                 void __user *oldval, size_t __user *oldlenp,
2652                 void __user *newval, size_t newlen)
2653 {
2654
2655         if (newval && newlen) {
2656                 int __user *vec = (int __user *) newval;
2657                 int *min = (int *) table->extra1;
2658                 int *max = (int *) table->extra2;
2659                 size_t length;
2660                 int i;
2661
2662                 if (newlen % sizeof(int) != 0)
2663                         return -EINVAL;
2664
2665                 if (!table->extra1 && !table->extra2)
2666                         return 0;
2667
2668                 if (newlen > table->maxlen)
2669                         newlen = table->maxlen;
2670                 length = newlen / sizeof(int);
2671
2672                 for (i = 0; i < length; i++) {
2673                         int value;
2674                         if (get_user(value, vec + i))
2675                                 return -EFAULT;
2676                         if (min && value < min[i])
2677                                 return -EINVAL;
2678                         if (max && value > max[i])
2679                                 return -EINVAL;
2680                 }
2681         }
2682         return 0;
2683 }
2684
2685 /* Strategy function to convert jiffies to seconds */
2686 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2687                 void __user *oldval, size_t __user *oldlenp,
2688                 void __user *newval, size_t newlen)
2689 {
2690         if (oldval && oldlenp) {
2691                 size_t olen;
2692
2693                 if (get_user(olen, oldlenp))
2694                         return -EFAULT;
2695                 if (olen) {
2696                         int val;
2697
2698                         if (olen < sizeof(int))
2699                                 return -EINVAL;
2700
2701                         val = *(int *)(table->data) / HZ;
2702                         if (put_user(val, (int __user *)oldval))
2703                                 return -EFAULT;
2704                         if (put_user(sizeof(int), oldlenp))
2705                                 return -EFAULT;
2706                 }
2707         }
2708         if (newval && newlen) {
2709                 int new;
2710                 if (newlen != sizeof(int))
2711                         return -EINVAL;
2712                 if (get_user(new, (int __user *)newval))
2713                         return -EFAULT;
2714                 *(int *)(table->data) = new*HZ;
2715         }
2716         return 1;
2717 }
2718
2719 /* Strategy function to convert jiffies to seconds */
2720 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2721                 void __user *oldval, size_t __user *oldlenp,
2722                 void __user *newval, size_t newlen)
2723 {
2724         if (oldval && oldlenp) {
2725                 size_t olen;
2726
2727                 if (get_user(olen, oldlenp))
2728                         return -EFAULT;
2729                 if (olen) {
2730                         int val;
2731
2732                         if (olen < sizeof(int))
2733                                 return -EINVAL;
2734
2735                         val = jiffies_to_msecs(*(int *)(table->data));
2736                         if (put_user(val, (int __user *)oldval))
2737                                 return -EFAULT;
2738                         if (put_user(sizeof(int), oldlenp))
2739                                 return -EFAULT;
2740                 }
2741         }
2742         if (newval && newlen) {
2743                 int new;
2744                 if (newlen != sizeof(int))
2745                         return -EINVAL;
2746                 if (get_user(new, (int __user *)newval))
2747                         return -EFAULT;
2748                 *(int *)(table->data) = msecs_to_jiffies(new);
2749         }
2750         return 1;
2751 }
2752
2753
2754
2755 #else /* CONFIG_SYSCTL_SYSCALL */
2756
2757
2758 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2759 {
2760         struct __sysctl_args tmp;
2761         int error;
2762
2763         if (copy_from_user(&tmp, args, sizeof(tmp)))
2764                 return -EFAULT;
2765
2766         error = deprecated_sysctl_warning(&tmp);
2767
2768         /* If no error reading the parameters then just -ENOSYS ... */
2769         if (!error)
2770                 error = -ENOSYS;
2771
2772         return error;
2773 }
2774
2775 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2776                   void __user *oldval, size_t __user *oldlenp,
2777                   void __user *newval, size_t newlen)
2778 {
2779         return -ENOSYS;
2780 }
2781
2782 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2783                   void __user *oldval, size_t __user *oldlenp,
2784                   void __user *newval, size_t newlen)
2785 {
2786         return -ENOSYS;
2787 }
2788
2789 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2790                 void __user *oldval, size_t __user *oldlenp,
2791                 void __user *newval, size_t newlen)
2792 {
2793         return -ENOSYS;
2794 }
2795
2796 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2797                 void __user *oldval, size_t __user *oldlenp,
2798                 void __user *newval, size_t newlen)
2799 {
2800         return -ENOSYS;
2801 }
2802
2803 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2804                 void __user *oldval, size_t __user *oldlenp,
2805                 void __user *newval, size_t newlen)
2806 {
2807         return -ENOSYS;
2808 }
2809
2810 #endif /* CONFIG_SYSCTL_SYSCALL */
2811
2812 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2813 {
2814         static int msg_count;
2815         int name[CTL_MAXNAME];
2816         int i;
2817
2818         /* Check args->nlen. */
2819         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2820                 return -ENOTDIR;
2821
2822         /* Read in the sysctl name for better debug message logging */
2823         for (i = 0; i < args->nlen; i++)
2824                 if (get_user(name[i], args->name + i))
2825                         return -EFAULT;
2826
2827         /* Ignore accesses to kernel.version */
2828         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2829                 return 0;
2830
2831         if (msg_count < 5) {
2832                 msg_count++;
2833                 printk(KERN_INFO
2834                         "warning: process `%s' used the deprecated sysctl "
2835                         "system call with ", current->comm);
2836                 for (i = 0; i < args->nlen; i++)
2837                         printk("%d.", name[i]);
2838                 printk("\n");
2839         }
2840         return 0;
2841 }
2842
2843 /*
2844  * No sense putting this after each symbol definition, twice,
2845  * exception granted :-)
2846  */
2847 EXPORT_SYMBOL(proc_dointvec);
2848 EXPORT_SYMBOL(proc_dointvec_jiffies);
2849 EXPORT_SYMBOL(proc_dointvec_minmax);
2850 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2851 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2852 EXPORT_SYMBOL(proc_dostring);
2853 EXPORT_SYMBOL(proc_doulongvec_minmax);
2854 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2855 EXPORT_SYMBOL(register_sysctl_table);
2856 EXPORT_SYMBOL(register_sysctl_paths);
2857 EXPORT_SYMBOL(sysctl_intvec);
2858 EXPORT_SYMBOL(sysctl_jiffies);
2859 EXPORT_SYMBOL(sysctl_ms_jiffies);
2860 EXPORT_SYMBOL(sysctl_string);
2861 EXPORT_SYMBOL(sysctl_data);
2862 EXPORT_SYMBOL(unregister_sysctl_table);