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/vmstat.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/acpi.h>
  49 #include <linux/reboot.h>
  50 #include <linux/ftrace.h>
  51
  52 #include <asm/uaccess.h>
  53 #include <asm/processor.h>
  54
  55 #ifdef CONFIG_X86
  56 #include <asm/nmi.h>
  57 #include <asm/stacktrace.h>
  58 #include <asm/io.h>
  59 #endif
  60
  61 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  62
  63 #if defined(CONFIG_SYSCTL)
  64
  65 /* External variables not in a header file. */
  66 extern int C_A_D;
  67 extern int print_fatal_signals;
  68 extern int sysctl_overcommit_memory;
  69 extern int sysctl_overcommit_ratio;
  70 extern int sysctl_panic_on_oom;
  71 extern int sysctl_oom_kill_allocating_task;
  72 extern int sysctl_oom_dump_tasks;
  73 extern int max_threads;
  74 extern int core_uses_pid;
  75 extern int suid_dumpable;
  76 extern char core_pattern[];
  77 extern int pid_max;
  78 extern int min_free_kbytes;
  79 extern int pid_max_min, pid_max_max;
  80 extern int sysctl_drop_caches;
  81 extern int percpu_pagelist_fraction;
  82 extern int compat_log;
  83 extern int latencytop_enabled;
  84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  85 #ifdef CONFIG_RCU_TORTURE_TEST
  86 extern int rcutorture_runnable;
  87 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
  88
  89 /* Constants used for minimum and  maximum */
  90 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
  91 static int one = 1;
  92 #endif
  93
  94 #ifdef CONFIG_DETECT_SOFTLOCKUP
  95 static int sixty = 60;
  96 static int neg_one = -1;
  97 #endif
  98
  99 #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
 100 static int two = 2;
 101 #endif
 102
 103 static int zero;
 104 static int one_hundred = 100;
 105
 106 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 107 static int maxolduid = 65535;
 108 static int minolduid;
 109 static int min_percpu_pagelist_fract = 8;
 110
 111 static int ngroups_max = NGROUPS_MAX;
 112
 113 #ifdef CONFIG_MODULES
 114 extern char modprobe_path[];
 115 #endif
 116 #ifdef CONFIG_CHR_DEV_SG
 117 extern int sg_big_buff;
 118 #endif
 119
 120 #ifdef CONFIG_SPARC
 121 #include <asm/system.h>
 122 #endif
 123
 124 #ifdef CONFIG_SPARC64
 125 extern int sysctl_tsb_ratio;
 126 #endif
 127
 128 #ifdef __hppa__
 129 extern int pwrsw_enabled;
 130 extern int unaligned_enabled;
 131 #endif
 132
 133 #ifdef CONFIG_S390
 134 #ifdef CONFIG_MATHEMU
 135 extern int sysctl_ieee_emulation_warnings;
 136 #endif
 137 extern int sysctl_userprocess_debug;
 138 extern int spin_retry;
 139 #endif
 140
 141 #ifdef CONFIG_BSD_PROCESS_ACCT
 142 extern int acct_parm[];
 143 #endif
 144
 145 #ifdef CONFIG_IA64
 146 extern int no_unaligned_warning;
 147 #endif
 148
 149 #ifdef CONFIG_RT_MUTEXES
 150 extern int max_lock_depth;
 151 #endif
 152
 153 #ifdef CONFIG_PROC_SYSCTL
 154 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 155                   void __user *buffer, size_t *lenp, loff_t *ppos);
 156 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
 157                                void __user *buffer, size_t *lenp, loff_t *ppos);
 158 #endif
 159
 160 static struct ctl_table root_table[];
 161 static struct ctl_table_root sysctl_table_root;
 162 static struct ctl_table_header root_table_header = {
 163         .count = 1,
 164         .ctl_table = root_table,
 165         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
 166         .root = &sysctl_table_root,
 167         .set = &sysctl_table_root.default_set,
 168 };
 169 static struct ctl_table_root sysctl_table_root = {
 170         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 171         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 172 };
 173
 174 static struct ctl_table kern_table[];
 175 static struct ctl_table vm_table[];
 176 static struct ctl_table fs_table[];
 177 static struct ctl_table debug_table[];
 178 static struct ctl_table dev_table[];
 179 extern struct ctl_table random_table[];
 180 #ifdef CONFIG_INOTIFY_USER
 181 extern struct ctl_table inotify_table[];
 182 #endif
 183 #ifdef CONFIG_EPOLL
 184 extern struct ctl_table epoll_table[];
 185 #endif
 186
 187 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 188 int sysctl_legacy_va_layout;
 189 #endif
 190
 191 extern int prove_locking;
 192 extern int lock_stat;
 193
 194 /* The default sysctl tables: */
 195
 196 static struct ctl_table root_table[] = {
 197         {
 198                 .ctl_name       = CTL_KERN,
 199                 .procname       = "kernel",
 200                 .mode           = 0555,
 201                 .child          = kern_table,
 202         },
 203         {
 204                 .ctl_name       = CTL_VM,
 205                 .procname       = "vm",
 206                 .mode           = 0555,
 207                 .child          = vm_table,
 208         },
 209         {
 210                 .ctl_name       = CTL_FS,
 211                 .procname       = "fs",
 212                 .mode           = 0555,
 213                 .child          = fs_table,
 214         },
 215         {
 216                 .ctl_name       = CTL_DEBUG,
 217                 .procname       = "debug",
 218                 .mode           = 0555,
 219                 .child          = debug_table,
 220         },
 221         {
 222                 .ctl_name       = CTL_DEV,
 223                 .procname       = "dev",
 224                 .mode           = 0555,
 225                 .child          = dev_table,
 226         },
 227 /*
 228  * NOTE: do not add new entries to this table unless you have read
 229  * Documentation/sysctl/ctl_unnumbered.txt
 230  */
 231         { .ctl_name = 0 }
 232 };
 233
 234 #ifdef CONFIG_SCHED_DEBUG
 235 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 236 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 237 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 238 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 239 #endif
 240
 241 static struct ctl_table kern_table[] = {
 242 #ifdef CONFIG_SCHED_DEBUG
 243         {
 244                 .ctl_name       = CTL_UNNUMBERED,
 245                 .procname       = "sched_min_granularity_ns",
 246                 .data           = &sysctl_sched_min_granularity,
 247                 .maxlen         = sizeof(unsigned int),
 248                 .mode           = 0644,
 249                 .proc_handler   = &sched_nr_latency_handler,
 250                 .strategy       = &sysctl_intvec,
 251                 .extra1         = &min_sched_granularity_ns,
 252                 .extra2         = &max_sched_granularity_ns,
 253         },
 254         {
 255                 .ctl_name       = CTL_UNNUMBERED,
 256                 .procname       = "sched_latency_ns",
 257                 .data           = &sysctl_sched_latency,
 258                 .maxlen         = sizeof(unsigned int),
 259                 .mode           = 0644,
 260                 .proc_handler   = &sched_nr_latency_handler,
 261                 .strategy       = &sysctl_intvec,
 262                 .extra1         = &min_sched_granularity_ns,
 263                 .extra2         = &max_sched_granularity_ns,
 264         },
 265         {
 266                 .ctl_name       = CTL_UNNUMBERED,
 267                 .procname       = "sched_wakeup_granularity_ns",
 268                 .data           = &sysctl_sched_wakeup_granularity,
 269                 .maxlen         = sizeof(unsigned int),
 270                 .mode           = 0644,
 271                 .proc_handler   = &proc_dointvec_minmax,
 272                 .strategy       = &sysctl_intvec,
 273                 .extra1         = &min_wakeup_granularity_ns,
 274                 .extra2         = &max_wakeup_granularity_ns,
 275         },
 276         {
 277                 .ctl_name       = CTL_UNNUMBERED,
 278                 .procname       = "sched_shares_ratelimit",
 279                 .data           = &sysctl_sched_shares_ratelimit,
 280                 .maxlen         = sizeof(unsigned int),
 281                 .mode           = 0644,
 282                 .proc_handler   = &proc_dointvec,
 283         },
 284         {
 285                 .ctl_name       = CTL_UNNUMBERED,
 286                 .procname       = "sched_shares_thresh",
 287                 .data           = &sysctl_sched_shares_thresh,
 288                 .maxlen         = sizeof(unsigned int),
 289                 .mode           = 0644,
 290                 .proc_handler   = &proc_dointvec_minmax,
 291                 .strategy       = &sysctl_intvec,
 292                 .extra1         = &zero,
 293         },
 294         {
 295                 .ctl_name       = CTL_UNNUMBERED,
 296                 .procname       = "sched_child_runs_first",
 297                 .data           = &sysctl_sched_child_runs_first,
 298                 .maxlen         = sizeof(unsigned int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec,
 301         },
 302         {
 303                 .ctl_name       = CTL_UNNUMBERED,
 304                 .procname       = "sched_features",
 305                 .data           = &sysctl_sched_features,
 306                 .maxlen         = sizeof(unsigned int),
 307                 .mode           = 0644,
 308                 .proc_handler   = &proc_dointvec,
 309         },
 310         {
 311                 .ctl_name       = CTL_UNNUMBERED,
 312                 .procname       = "sched_migration_cost",
 313                 .data           = &sysctl_sched_migration_cost,
 314                 .maxlen         = sizeof(unsigned int),
 315                 .mode           = 0644,
 316                 .proc_handler   = &proc_dointvec,
 317         },
 318         {
 319                 .ctl_name       = CTL_UNNUMBERED,
 320                 .procname       = "sched_nr_migrate",
 321                 .data           = &sysctl_sched_nr_migrate,
 322                 .maxlen         = sizeof(unsigned int),
 323                 .mode           = 0644,
 324                 .proc_handler   = &proc_dointvec,
 325         },
 326 #endif
 327         {
 328                 .ctl_name       = CTL_UNNUMBERED,
 329                 .procname       = "sched_rt_period_us",
 330                 .data           = &sysctl_sched_rt_period,
 331                 .maxlen         = sizeof(unsigned int),
 332                 .mode           = 0644,
 333                 .proc_handler   = &sched_rt_handler,
 334         },
 335         {
 336                 .ctl_name       = CTL_UNNUMBERED,
 337                 .procname       = "sched_rt_runtime_us",
 338                 .data           = &sysctl_sched_rt_runtime,
 339                 .maxlen         = sizeof(int),
 340                 .mode           = 0644,
 341                 .proc_handler   = &sched_rt_handler,
 342         },
 343         {
 344                 .ctl_name       = CTL_UNNUMBERED,
 345                 .procname       = "sched_compat_yield",
 346                 .data           = &sysctl_sched_compat_yield,
 347                 .maxlen         = sizeof(unsigned int),
 348                 .mode           = 0644,
 349                 .proc_handler   = &proc_dointvec,
 350         },
 351 #ifdef CONFIG_PROVE_LOCKING
 352         {
 353                 .ctl_name       = CTL_UNNUMBERED,
 354                 .procname       = "prove_locking",
 355                 .data           = &prove_locking,
 356                 .maxlen         = sizeof(int),
 357                 .mode           = 0644,
 358                 .proc_handler   = &proc_dointvec,
 359         },
 360 #endif
 361 #ifdef CONFIG_LOCK_STAT
 362         {
 363                 .ctl_name       = CTL_UNNUMBERED,
 364                 .procname       = "lock_stat",
 365                 .data           = &lock_stat,
 366                 .maxlen         = sizeof(int),
 367                 .mode           = 0644,
 368                 .proc_handler   = &proc_dointvec,
 369         },
 370 #endif
 371         {
 372                 .ctl_name       = KERN_PANIC,
 373                 .procname       = "panic",
 374                 .data           = &panic_timeout,
 375                 .maxlen         = sizeof(int),
 376                 .mode           = 0644,
 377                 .proc_handler   = &proc_dointvec,
 378         },
 379         {
 380                 .ctl_name       = KERN_CORE_USES_PID,
 381                 .procname       = "core_uses_pid",
 382                 .data           = &core_uses_pid,
 383                 .maxlen         = sizeof(int),
 384                 .mode           = 0644,
 385                 .proc_handler   = &proc_dointvec,
 386         },
 387         {
 388                 .ctl_name       = KERN_CORE_PATTERN,
 389                 .procname       = "core_pattern",
 390                 .data           = core_pattern,
 391                 .maxlen         = CORENAME_MAX_SIZE,
 392                 .mode           = 0644,
 393                 .proc_handler   = &proc_dostring,
 394                 .strategy       = &sysctl_string,
 395         },
 396 #ifdef CONFIG_PROC_SYSCTL
 397         {
 398                 .procname       = "tainted",
 399                 .maxlen         = sizeof(long),
 400                 .mode           = 0644,
 401                 .proc_handler   = &proc_taint,
 402         },
 403 #endif
 404 #ifdef CONFIG_LATENCYTOP
 405         {
 406                 .procname       = "latencytop",
 407                 .data           = &latencytop_enabled,
 408                 .maxlen         = sizeof(int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec,
 411         },
 412 #endif
 413 #ifdef CONFIG_BLK_DEV_INITRD
 414         {
 415                 .ctl_name       = KERN_REALROOTDEV,
 416                 .procname       = "real-root-dev",
 417                 .data           = &real_root_dev,
 418                 .maxlen         = sizeof(int),
 419                 .mode           = 0644,
 420                 .proc_handler   = &proc_dointvec,
 421         },
 422 #endif
 423         {
 424                 .ctl_name       = CTL_UNNUMBERED,
 425                 .procname       = "print-fatal-signals",
 426                 .data           = &print_fatal_signals,
 427                 .maxlen         = sizeof(int),
 428                 .mode           = 0644,
 429                 .proc_handler   = &proc_dointvec,
 430         },
 431 #ifdef CONFIG_SPARC
 432         {
 433                 .ctl_name       = KERN_SPARC_REBOOT,
 434                 .procname       = "reboot-cmd",
 435                 .data           = reboot_command,
 436                 .maxlen         = 256,
 437                 .mode           = 0644,
 438                 .proc_handler   = &proc_dostring,
 439                 .strategy       = &sysctl_string,
 440         },
 441         {
 442                 .ctl_name       = KERN_SPARC_STOP_A,
 443                 .procname       = "stop-a",
 444                 .data           = &stop_a_enabled,
 445                 .maxlen         = sizeof (int),
 446                 .mode           = 0644,
 447                 .proc_handler   = &proc_dointvec,
 448         },
 449         {
 450                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 451                 .procname       = "scons-poweroff",
 452                 .data           = &scons_pwroff,
 453                 .maxlen         = sizeof (int),
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dointvec,
 456         },
 457 #endif
 458 #ifdef CONFIG_SPARC64
 459         {
 460                 .ctl_name       = CTL_UNNUMBERED,
 461                 .procname       = "tsb-ratio",
 462                 .data           = &sysctl_tsb_ratio,
 463                 .maxlen         = sizeof (int),
 464                 .mode           = 0644,
 465                 .proc_handler   = &proc_dointvec,
 466         },
 467 #endif
 468 #ifdef __hppa__
 469         {
 470                 .ctl_name       = KERN_HPPA_PWRSW,
 471                 .procname       = "soft-power",
 472                 .data           = &pwrsw_enabled,
 473                 .maxlen         = sizeof (int),
 474                 .mode           = 0644,
 475                 .proc_handler   = &proc_dointvec,
 476         },
 477         {
 478                 .ctl_name       = KERN_HPPA_UNALIGNED,
 479                 .procname       = "unaligned-trap",
 480                 .data           = &unaligned_enabled,
 481                 .maxlen         = sizeof (int),
 482                 .mode           = 0644,
 483                 .proc_handler   = &proc_dointvec,
 484         },
 485 #endif
 486         {
 487                 .ctl_name       = KERN_CTLALTDEL,
 488                 .procname       = "ctrl-alt-del",
 489                 .data           = &C_A_D,
 490                 .maxlen         = sizeof(int),
 491                 .mode           = 0644,
 492                 .proc_handler   = &proc_dointvec,
 493         },
 494 #ifdef CONFIG_FUNCTION_TRACER
 495         {
 496                 .ctl_name       = CTL_UNNUMBERED,
 497                 .procname       = "ftrace_enabled",
 498                 .data           = &ftrace_enabled,
 499                 .maxlen         = sizeof(int),
 500                 .mode           = 0644,
 501                 .proc_handler   = &ftrace_enable_sysctl,
 502         },
 503 #endif
 504 #ifdef CONFIG_STACK_TRACER
 505         {
 506                 .ctl_name       = CTL_UNNUMBERED,
 507                 .procname       = "stack_tracer_enabled",
 508                 .data           = &stack_tracer_enabled,
 509                 .maxlen         = sizeof(int),
 510                 .mode           = 0644,
 511                 .proc_handler   = &stack_trace_sysctl,
 512         },
 513 #endif
 514 #ifdef CONFIG_TRACING
 515         {
 516                 .ctl_name       = CTL_UNNUMBERED,
 517                 .procname       = "ftrace_dump_on_oops",
 518                 .data           = &ftrace_dump_on_oops,
 519                 .maxlen         = sizeof(int),
 520                 .mode           = 0644,
 521                 .proc_handler   = &proc_dointvec,
 522         },
 523 #endif
 524 #ifdef CONFIG_MODULES
 525         {
 526                 .ctl_name       = KERN_MODPROBE,
 527                 .procname       = "modprobe",
 528                 .data           = &modprobe_path,
 529                 .maxlen         = KMOD_PATH_LEN,
 530                 .mode           = 0644,
 531                 .proc_handler   = &proc_dostring,
 532                 .strategy       = &sysctl_string,
 533         },
 534 #endif
 535 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 536         {
 537                 .ctl_name       = KERN_HOTPLUG,
 538                 .procname       = "hotplug",
 539                 .data           = &uevent_helper,
 540                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 541                 .mode           = 0644,
 542                 .proc_handler   = &proc_dostring,
 543                 .strategy       = &sysctl_string,
 544         },
 545 #endif
 546 #ifdef CONFIG_CHR_DEV_SG
 547         {
 548                 .ctl_name       = KERN_SG_BIG_BUFF,
 549                 .procname       = "sg-big-buff",
 550                 .data           = &sg_big_buff,
 551                 .maxlen         = sizeof (int),
 552                 .mode           = 0444,
 553                 .proc_handler   = &proc_dointvec,
 554         },
 555 #endif
 556 #ifdef CONFIG_BSD_PROCESS_ACCT
 557         {
 558                 .ctl_name       = KERN_ACCT,
 559                 .procname       = "acct",
 560                 .data           = &acct_parm,
 561                 .maxlen         = 3*sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec,
 564         },
 565 #endif
 566 #ifdef CONFIG_MAGIC_SYSRQ
 567         {
 568                 .ctl_name       = KERN_SYSRQ,
 569                 .procname       = "sysrq",
 570                 .data           = &__sysrq_enabled,
 571                 .maxlen         = sizeof (int),
 572                 .mode           = 0644,
 573                 .proc_handler   = &proc_dointvec,
 574         },
 575 #endif
 576 #ifdef CONFIG_PROC_SYSCTL
 577         {
 578                 .procname       = "cad_pid",
 579                 .data           = NULL,
 580                 .maxlen         = sizeof (int),
 581                 .mode           = 0600,
 582                 .proc_handler   = &proc_do_cad_pid,
 583         },
 584 #endif
 585         {
 586                 .ctl_name       = KERN_MAX_THREADS,
 587                 .procname       = "threads-max",
 588                 .data           = &max_threads,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = &proc_dointvec,
 592         },
 593         {
 594                 .ctl_name       = KERN_RANDOM,
 595                 .procname       = "random",
 596                 .mode           = 0555,
 597                 .child          = random_table,
 598         },
 599         {
 600                 .ctl_name       = KERN_OVERFLOWUID,
 601                 .procname       = "overflowuid",
 602                 .data           = &overflowuid,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = &proc_dointvec_minmax,
 606                 .strategy       = &sysctl_intvec,
 607                 .extra1         = &minolduid,
 608                 .extra2         = &maxolduid,
 609         },
 610         {
 611                 .ctl_name       = KERN_OVERFLOWGID,
 612                 .procname       = "overflowgid",
 613                 .data           = &overflowgid,
 614                 .maxlen         = sizeof(int),
 615                 .mode           = 0644,
 616                 .proc_handler   = &proc_dointvec_minmax,
 617                 .strategy       = &sysctl_intvec,
 618                 .extra1         = &minolduid,
 619                 .extra2         = &maxolduid,
 620         },
 621 #ifdef CONFIG_S390
 622 #ifdef CONFIG_MATHEMU
 623         {
 624                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 625                 .procname       = "ieee_emulation_warnings",
 626                 .data           = &sysctl_ieee_emulation_warnings,
 627                 .maxlen         = sizeof(int),
 628                 .mode           = 0644,
 629                 .proc_handler   = &proc_dointvec,
 630         },
 631 #endif
 632         {
 633                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 634                 .procname       = "userprocess_debug",
 635                 .data           = &sysctl_userprocess_debug,
 636                 .maxlen         = sizeof(int),
 637                 .mode           = 0644,
 638                 .proc_handler   = &proc_dointvec,
 639         },
 640 #endif
 641         {
 642                 .ctl_name       = KERN_PIDMAX,
 643                 .procname       = "pid_max",
 644                 .data           = &pid_max,
 645                 .maxlen         = sizeof (int),
 646                 .mode           = 0644,
 647                 .proc_handler   = &proc_dointvec_minmax,
 648                 .strategy       = sysctl_intvec,
 649                 .extra1         = &pid_max_min,
 650                 .extra2         = &pid_max_max,
 651         },
 652         {
 653                 .ctl_name       = KERN_PANIC_ON_OOPS,
 654                 .procname       = "panic_on_oops",
 655                 .data           = &panic_on_oops,
 656                 .maxlen         = sizeof(int),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_dointvec,
 659         },
 660 #if defined CONFIG_PRINTK
 661         {
 662                 .ctl_name       = KERN_PRINTK,
 663                 .procname       = "printk",
 664                 .data           = &console_loglevel,
 665                 .maxlen         = 4*sizeof(int),
 666                 .mode           = 0644,
 667                 .proc_handler   = &proc_dointvec,
 668         },
 669         {
 670                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 671                 .procname       = "printk_ratelimit",
 672                 .data           = &printk_ratelimit_state.interval,
 673                 .maxlen         = sizeof(int),
 674                 .mode           = 0644,
 675                 .proc_handler   = &proc_dointvec_jiffies,
 676                 .strategy       = &sysctl_jiffies,
 677         },
 678         {
 679                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 680                 .procname       = "printk_ratelimit_burst",
 681                 .data           = &printk_ratelimit_state.burst,
 682                 .maxlen         = sizeof(int),
 683                 .mode           = 0644,
 684                 .proc_handler   = &proc_dointvec,
 685         },
 686 #endif
 687         {
 688                 .ctl_name       = KERN_NGROUPS_MAX,
 689                 .procname       = "ngroups_max",
 690                 .data           = &ngroups_max,
 691                 .maxlen         = sizeof (int),
 692                 .mode           = 0444,
 693                 .proc_handler   = &proc_dointvec,
 694         },
 695 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 696         {
 697                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 698                 .procname       = "unknown_nmi_panic",
 699                 .data           = &unknown_nmi_panic,
 700                 .maxlen         = sizeof (int),
 701                 .mode           = 0644,
 702                 .proc_handler   = &proc_dointvec,
 703         },
 704         {
 705                 .procname       = "nmi_watchdog",
 706                 .data           = &nmi_watchdog_enabled,
 707                 .maxlen         = sizeof (int),
 708                 .mode           = 0644,
 709                 .proc_handler   = &proc_nmi_enabled,
 710         },
 711 #endif
 712 #if defined(CONFIG_X86)
 713         {
 714                 .ctl_name       = KERN_PANIC_ON_NMI,
 715                 .procname       = "panic_on_unrecovered_nmi",
 716                 .data           = &panic_on_unrecovered_nmi,
 717                 .maxlen         = sizeof(int),
 718                 .mode           = 0644,
 719                 .proc_handler   = &proc_dointvec,
 720         },
 721         {
 722                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 723                 .procname       = "bootloader_type",
 724                 .data           = &bootloader_type,
 725                 .maxlen         = sizeof (int),
 726                 .mode           = 0444,
 727                 .proc_handler   = &proc_dointvec,
 728         },
 729         {
 730                 .ctl_name       = CTL_UNNUMBERED,
 731                 .procname       = "kstack_depth_to_print",
 732                 .data           = &kstack_depth_to_print,
 733                 .maxlen         = sizeof(int),
 734                 .mode           = 0644,
 735                 .proc_handler   = &proc_dointvec,
 736         },
 737         {
 738                 .ctl_name       = CTL_UNNUMBERED,
 739                 .procname       = "io_delay_type",
 740                 .data           = &io_delay_type,
 741                 .maxlen         = sizeof(int),
 742                 .mode           = 0644,
 743                 .proc_handler   = &proc_dointvec,
 744         },
 745 #endif
 746 #if defined(CONFIG_MMU)
 747         {
 748                 .ctl_name       = KERN_RANDOMIZE,
 749                 .procname       = "randomize_va_space",
 750                 .data           = &randomize_va_space,
 751                 .maxlen         = sizeof(int),
 752                 .mode           = 0644,
 753                 .proc_handler   = &proc_dointvec,
 754         },
 755 #endif
 756 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 757         {
 758                 .ctl_name       = KERN_SPIN_RETRY,
 759                 .procname       = "spin_retry",
 760                 .data           = &spin_retry,
 761                 .maxlen         = sizeof (int),
 762                 .mode           = 0644,
 763                 .proc_handler   = &proc_dointvec,
 764         },
 765 #endif
 766 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 767         {
 768                 .procname       = "acpi_video_flags",
 769                 .data           = &acpi_realmode_flags,
 770                 .maxlen         = sizeof (unsigned long),
 771                 .mode           = 0644,
 772                 .proc_handler   = &proc_doulongvec_minmax,
 773         },
 774 #endif
 775 #ifdef CONFIG_IA64
 776         {
 777                 .ctl_name       = KERN_IA64_UNALIGNED,
 778                 .procname       = "ignore-unaligned-usertrap",
 779                 .data           = &no_unaligned_warning,
 780                 .maxlen         = sizeof (int),
 781                 .mode           = 0644,
 782                 .proc_handler   = &proc_dointvec,
 783         },
 784 #endif
 785 #ifdef CONFIG_DETECT_SOFTLOCKUP
 786         {
 787                 .ctl_name       = CTL_UNNUMBERED,
 788                 .procname       = "softlockup_panic",
 789                 .data           = &softlockup_panic,
 790                 .maxlen         = sizeof(int),
 791                 .mode           = 0644,
 792                 .proc_handler   = &proc_dointvec_minmax,
 793                 .strategy       = &sysctl_intvec,
 794                 .extra1         = &zero,
 795                 .extra2         = &one,
 796         },
 797         {
 798                 .ctl_name       = CTL_UNNUMBERED,
 799                 .procname       = "softlockup_thresh",
 800                 .data           = &softlockup_thresh,
 801                 .maxlen         = sizeof(int),
 802                 .mode           = 0644,
 803                 .proc_handler   = &proc_dointvec_minmax,
 804                 .strategy       = &sysctl_intvec,
 805                 .extra1         = &neg_one,
 806                 .extra2         = &sixty,
 807         },
 808         {
 809                 .ctl_name       = CTL_UNNUMBERED,
 810                 .procname       = "hung_task_check_count",
 811                 .data           = &sysctl_hung_task_check_count,
 812                 .maxlen         = sizeof(unsigned long),
 813                 .mode           = 0644,
 814                 .proc_handler   = &proc_doulongvec_minmax,
 815                 .strategy       = &sysctl_intvec,
 816         },
 817         {
 818                 .ctl_name       = CTL_UNNUMBERED,
 819                 .procname       = "hung_task_timeout_secs",
 820                 .data           = &sysctl_hung_task_timeout_secs,
 821                 .maxlen         = sizeof(unsigned long),
 822                 .mode           = 0644,
 823                 .proc_handler   = &proc_doulongvec_minmax,
 824                 .strategy       = &sysctl_intvec,
 825         },
 826         {
 827                 .ctl_name       = CTL_UNNUMBERED,
 828                 .procname       = "hung_task_warnings",
 829                 .data           = &sysctl_hung_task_warnings,
 830                 .maxlen         = sizeof(unsigned long),
 831                 .mode           = 0644,
 832                 .proc_handler   = &proc_doulongvec_minmax,
 833                 .strategy       = &sysctl_intvec,
 834         },
 835 #endif
 836 #ifdef CONFIG_COMPAT
 837         {
 838                 .ctl_name       = KERN_COMPAT_LOG,
 839                 .procname       = "compat-log",
 840                 .data           = &compat_log,
 841                 .maxlen         = sizeof (int),
 842                 .mode           = 0644,
 843                 .proc_handler   = &proc_dointvec,
 844         },
 845 #endif
 846 #ifdef CONFIG_RT_MUTEXES
 847         {
 848                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 849                 .procname       = "max_lock_depth",
 850                 .data           = &max_lock_depth,
 851                 .maxlen         = sizeof(int),
 852                 .mode           = 0644,
 853                 .proc_handler   = &proc_dointvec,
 854         },
 855 #endif
 856         {
 857                 .ctl_name       = CTL_UNNUMBERED,
 858                 .procname       = "poweroff_cmd",
 859                 .data           = &poweroff_cmd,
 860                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 861                 .mode           = 0644,
 862                 .proc_handler   = &proc_dostring,
 863                 .strategy       = &sysctl_string,
 864         },
 865 #ifdef CONFIG_KEYS
 866         {
 867                 .ctl_name       = CTL_UNNUMBERED,
 868                 .procname       = "keys",
 869                 .mode           = 0555,
 870                 .child          = key_sysctls,
 871         },
 872 #endif
 873 #ifdef CONFIG_RCU_TORTURE_TEST
 874         {
 875                 .ctl_name       = CTL_UNNUMBERED,
 876                 .procname       = "rcutorture_runnable",
 877                 .data           = &rcutorture_runnable,
 878                 .maxlen         = sizeof(int),
 879                 .mode           = 0644,
 880                 .proc_handler   = &proc_dointvec,
 881         },
 882 #endif
 883 #ifdef CONFIG_UNEVICTABLE_LRU
 884         {
 885                 .ctl_name       = CTL_UNNUMBERED,
 886                 .procname       = "scan_unevictable_pages",
 887                 .data           = &scan_unevictable_pages,
 888                 .maxlen         = sizeof(scan_unevictable_pages),
 889                 .mode           = 0644,
 890                 .proc_handler   = &scan_unevictable_handler,
 891         },
 892 #endif
 893 /*
 894  * NOTE: do not add new entries to this table unless you have read
 895  * Documentation/sysctl/ctl_unnumbered.txt
 896  */
 897         { .ctl_name = 0 }
 898 };
 899
 900 static struct ctl_table vm_table[] = {
 901         {
 902                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 903                 .procname       = "overcommit_memory",
 904                 .data           = &sysctl_overcommit_memory,
 905                 .maxlen         = sizeof(sysctl_overcommit_memory),
 906                 .mode           = 0644,
 907                 .proc_handler   = &proc_dointvec,
 908         },
 909         {
 910                 .ctl_name       = VM_PANIC_ON_OOM,
 911                 .procname       = "panic_on_oom",
 912                 .data           = &sysctl_panic_on_oom,
 913                 .maxlen         = sizeof(sysctl_panic_on_oom),
 914                 .mode           = 0644,
 915                 .proc_handler   = &proc_dointvec,
 916         },
 917         {
 918                 .ctl_name       = CTL_UNNUMBERED,
 919                 .procname       = "oom_kill_allocating_task",
 920                 .data           = &sysctl_oom_kill_allocating_task,
 921                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 922                 .mode           = 0644,
 923                 .proc_handler   = &proc_dointvec,
 924         },
 925         {
 926                 .ctl_name       = CTL_UNNUMBERED,
 927                 .procname       = "oom_dump_tasks",
 928                 .data           = &sysctl_oom_dump_tasks,
 929                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 930                 .mode           = 0644,
 931                 .proc_handler   = &proc_dointvec,
 932         },
 933         {
 934                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 935                 .procname       = "overcommit_ratio",
 936                 .data           = &sysctl_overcommit_ratio,
 937                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 938                 .mode           = 0644,
 939                 .proc_handler   = &proc_dointvec,
 940         },
 941         {
 942                 .ctl_name       = VM_PAGE_CLUSTER,
 943                 .procname       = "page-cluster",
 944                 .data           = &page_cluster,
 945                 .maxlen         = sizeof(int),
 946                 .mode           = 0644,
 947                 .proc_handler   = &proc_dointvec,
 948         },
 949         {
 950                 .ctl_name       = VM_DIRTY_BACKGROUND,
 951                 .procname       = "dirty_background_ratio",
 952                 .data           = &dirty_background_ratio,
 953                 .maxlen         = sizeof(dirty_background_ratio),
 954                 .mode           = 0644,
 955                 .proc_handler   = &proc_dointvec_minmax,
 956                 .strategy       = &sysctl_intvec,
 957                 .extra1         = &zero,
 958                 .extra2         = &one_hundred,
 959         },
 960         {
 961                 .ctl_name       = VM_DIRTY_RATIO,
 962                 .procname       = "dirty_ratio",
 963                 .data           = &vm_dirty_ratio,
 964                 .maxlen         = sizeof(vm_dirty_ratio),
 965                 .mode           = 0644,
 966                 .proc_handler   = &dirty_ratio_handler,
 967                 .strategy       = &sysctl_intvec,
 968                 .extra1         = &zero,
 969                 .extra2         = &one_hundred,
 970         },
 971         {
 972                 .procname       = "dirty_writeback_centisecs",
 973                 .data           = &dirty_writeback_interval,
 974                 .maxlen         = sizeof(dirty_writeback_interval),
 975                 .mode           = 0644,
 976                 .proc_handler   = &dirty_writeback_centisecs_handler,
 977         },
 978         {
 979                 .procname       = "dirty_expire_centisecs",
 980                 .data           = &dirty_expire_interval,
 981                 .maxlen         = sizeof(dirty_expire_interval),
 982                 .mode           = 0644,
 983                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 984         },
 985         {
 986                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 987                 .procname       = "nr_pdflush_threads",
 988                 .data           = &nr_pdflush_threads,
 989                 .maxlen         = sizeof nr_pdflush_threads,
 990                 .mode           = 0444 /* read-only*/,
 991                 .proc_handler   = &proc_dointvec,
 992         },
 993         {
 994                 .ctl_name       = VM_SWAPPINESS,
 995                 .procname       = "swappiness",
 996                 .data           = &vm_swappiness,
 997                 .maxlen         = sizeof(vm_swappiness),
 998                 .mode           = 0644,
 999                 .proc_handler   = &proc_dointvec_minmax,
1000                 .strategy       = &sysctl_intvec,
1001                 .extra1         = &zero,
1002                 .extra2         = &one_hundred,
1003         },
1004 #ifdef CONFIG_HUGETLB_PAGE
1005          {
1006                 .procname       = "nr_hugepages",
1007                 .data           = NULL,
1008                 .maxlen         = sizeof(unsigned long),
1009                 .mode           = 0644,
1010                 .proc_handler   = &hugetlb_sysctl_handler,
1011                 .extra1         = (void *)&hugetlb_zero,
1012                 .extra2         = (void *)&hugetlb_infinity,
1013          },
1014          {
1015                 .ctl_name       = VM_HUGETLB_GROUP,
1016                 .procname       = "hugetlb_shm_group",
1017                 .data           = &sysctl_hugetlb_shm_group,
1018                 .maxlen         = sizeof(gid_t),
1019                 .mode           = 0644,
1020                 .proc_handler   = &proc_dointvec,
1021          },
1022          {
1023                 .ctl_name       = CTL_UNNUMBERED,
1024                 .procname       = "hugepages_treat_as_movable",
1025                 .data           = &hugepages_treat_as_movable,
1026                 .maxlen         = sizeof(int),
1027                 .mode           = 0644,
1028                 .proc_handler   = &hugetlb_treat_movable_handler,
1029         },
1030         {
1031                 .ctl_name       = CTL_UNNUMBERED,
1032                 .procname       = "nr_overcommit_hugepages",
1033                 .data           = NULL,
1034                 .maxlen         = sizeof(unsigned long),
1035                 .mode           = 0644,
1036                 .proc_handler   = &hugetlb_overcommit_handler,
1037                 .extra1         = (void *)&hugetlb_zero,
1038                 .extra2         = (void *)&hugetlb_infinity,
1039         },
1040 #endif
1041         {
1042                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
1043                 .procname       = "lowmem_reserve_ratio",
1044                 .data           = &sysctl_lowmem_reserve_ratio,
1045                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1046                 .mode           = 0644,
1047                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1048                 .strategy       = &sysctl_intvec,
1049         },
1050         {
1051                 .ctl_name       = VM_DROP_PAGECACHE,
1052                 .procname       = "drop_caches",
1053                 .data           = &sysctl_drop_caches,
1054                 .maxlen         = sizeof(int),
1055                 .mode           = 0644,
1056                 .proc_handler   = drop_caches_sysctl_handler,
1057                 .strategy       = &sysctl_intvec,
1058         },
1059         {
1060                 .ctl_name       = VM_MIN_FREE_KBYTES,
1061                 .procname       = "min_free_kbytes",
1062                 .data           = &min_free_kbytes,
1063                 .maxlen         = sizeof(min_free_kbytes),
1064                 .mode           = 0644,
1065                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1066                 .strategy       = &sysctl_intvec,
1067                 .extra1         = &zero,
1068         },
1069         {
1070                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1071                 .procname       = "percpu_pagelist_fraction",
1072                 .data           = &percpu_pagelist_fraction,
1073                 .maxlen         = sizeof(percpu_pagelist_fraction),
1074                 .mode           = 0644,
1075                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1076                 .strategy       = &sysctl_intvec,
1077                 .extra1         = &min_percpu_pagelist_fract,
1078         },
1079 #ifdef CONFIG_MMU
1080         {
1081                 .ctl_name       = VM_MAX_MAP_COUNT,
1082                 .procname       = "max_map_count",
1083                 .data           = &sysctl_max_map_count,
1084                 .maxlen         = sizeof(sysctl_max_map_count),
1085                 .mode           = 0644,
1086                 .proc_handler   = &proc_dointvec
1087         },
1088 #endif
1089         {
1090                 .ctl_name       = VM_LAPTOP_MODE,
1091                 .procname       = "laptop_mode",
1092                 .data           = &laptop_mode,
1093                 .maxlen         = sizeof(laptop_mode),
1094                 .mode           = 0644,
1095                 .proc_handler   = &proc_dointvec_jiffies,
1096                 .strategy       = &sysctl_jiffies,
1097         },
1098         {
1099                 .ctl_name       = VM_BLOCK_DUMP,
1100                 .procname       = "block_dump",
1101                 .data           = &block_dump,
1102                 .maxlen         = sizeof(block_dump),
1103                 .mode           = 0644,
1104                 .proc_handler   = &proc_dointvec,
1105                 .strategy       = &sysctl_intvec,
1106                 .extra1         = &zero,
1107         },
1108         {
1109                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1110                 .procname       = "vfs_cache_pressure",
1111                 .data           = &sysctl_vfs_cache_pressure,
1112                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1113                 .mode           = 0644,
1114                 .proc_handler   = &proc_dointvec,
1115                 .strategy       = &sysctl_intvec,
1116                 .extra1         = &zero,
1117         },
1118 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1119         {
1120                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1121                 .procname       = "legacy_va_layout",
1122                 .data           = &sysctl_legacy_va_layout,
1123                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1124                 .mode           = 0644,
1125                 .proc_handler   = &proc_dointvec,
1126                 .strategy       = &sysctl_intvec,
1127                 .extra1         = &zero,
1128         },
1129 #endif
1130 #ifdef CONFIG_NUMA
1131         {
1132                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1133                 .procname       = "zone_reclaim_mode",
1134                 .data           = &zone_reclaim_mode,
1135                 .maxlen         = sizeof(zone_reclaim_mode),
1136                 .mode           = 0644,
1137                 .proc_handler   = &proc_dointvec,
1138                 .strategy       = &sysctl_intvec,
1139                 .extra1         = &zero,
1140         },
1141         {
1142                 .ctl_name       = VM_MIN_UNMAPPED,
1143                 .procname       = "min_unmapped_ratio",
1144                 .data           = &sysctl_min_unmapped_ratio,
1145                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1146                 .mode           = 0644,
1147                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1148                 .strategy       = &sysctl_intvec,
1149                 .extra1         = &zero,
1150                 .extra2         = &one_hundred,
1151         },
1152         {
1153                 .ctl_name       = VM_MIN_SLAB,
1154                 .procname       = "min_slab_ratio",
1155                 .data           = &sysctl_min_slab_ratio,
1156                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1157                 .mode           = 0644,
1158                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1159                 .strategy       = &sysctl_intvec,
1160                 .extra1         = &zero,
1161                 .extra2         = &one_hundred,
1162         },
1163 #endif
1164 #ifdef CONFIG_SMP
1165         {
1166                 .ctl_name       = CTL_UNNUMBERED,
1167                 .procname       = "stat_interval",
1168                 .data           = &sysctl_stat_interval,
1169                 .maxlen         = sizeof(sysctl_stat_interval),
1170                 .mode           = 0644,
1171                 .proc_handler   = &proc_dointvec_jiffies,
1172                 .strategy       = &sysctl_jiffies,
1173         },
1174 #endif
1175 #ifdef CONFIG_SECURITY
1176         {
1177                 .ctl_name       = CTL_UNNUMBERED,
1178                 .procname       = "mmap_min_addr",
1179                 .data           = &mmap_min_addr,
1180                 .maxlen         = sizeof(unsigned long),
1181                 .mode           = 0644,
1182                 .proc_handler   = &proc_doulongvec_minmax,
1183         },
1184 #endif
1185 #ifdef CONFIG_NUMA
1186         {
1187                 .ctl_name       = CTL_UNNUMBERED,
1188                 .procname       = "numa_zonelist_order",
1189                 .data           = &numa_zonelist_order,
1190                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1191                 .mode           = 0644,
1192                 .proc_handler   = &numa_zonelist_order_handler,
1193                 .strategy       = &sysctl_string,
1194         },
1195 #endif
1196 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1197    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1198         {
1199                 .ctl_name       = VM_VDSO_ENABLED,
1200                 .procname       = "vdso_enabled",
1201                 .data           = &vdso_enabled,
1202                 .maxlen         = sizeof(vdso_enabled),
1203                 .mode           = 0644,
1204                 .proc_handler   = &proc_dointvec,
1205                 .strategy       = &sysctl_intvec,
1206                 .extra1         = &zero,
1207         },
1208 #endif
1209 #ifdef CONFIG_HIGHMEM
1210         {
1211                 .ctl_name       = CTL_UNNUMBERED,
1212                 .procname       = "highmem_is_dirtyable",
1213                 .data           = &vm_highmem_is_dirtyable,
1214                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1215                 .mode           = 0644,
1216                 .proc_handler   = &proc_dointvec_minmax,
1217                 .strategy       = &sysctl_intvec,
1218                 .extra1         = &zero,
1219                 .extra2         = &one,
1220         },
1221 #endif
1222 /*
1223  * NOTE: do not add new entries to this table unless you have read
1224  * Documentation/sysctl/ctl_unnumbered.txt
1225  */
1226         { .ctl_name = 0 }
1227 };
1228
1229 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1230 static struct ctl_table binfmt_misc_table[] = {
1231         { .ctl_name = 0 }
1232 };
1233 #endif
1234
1235 static struct ctl_table fs_table[] = {
1236         {
1237                 .ctl_name       = FS_NRINODE,
1238                 .procname       = "inode-nr",
1239                 .data           = &inodes_stat,
1240                 .maxlen         = 2*sizeof(int),
1241                 .mode           = 0444,
1242                 .proc_handler   = &proc_dointvec,
1243         },
1244         {
1245                 .ctl_name       = FS_STATINODE,
1246                 .procname       = "inode-state",
1247                 .data           = &inodes_stat,
1248                 .maxlen         = 7*sizeof(int),
1249                 .mode           = 0444,
1250                 .proc_handler   = &proc_dointvec,
1251         },
1252         {
1253                 .procname       = "file-nr",
1254                 .data           = &files_stat,
1255                 .maxlen         = 3*sizeof(int),
1256                 .mode           = 0444,
1257                 .proc_handler   = &proc_nr_files,
1258         },
1259         {
1260                 .ctl_name       = FS_MAXFILE,
1261                 .procname       = "file-max",
1262                 .data           = &files_stat.max_files,
1263                 .maxlen         = sizeof(int),
1264                 .mode           = 0644,
1265                 .proc_handler   = &proc_dointvec,
1266         },
1267         {
1268                 .ctl_name       = CTL_UNNUMBERED,
1269                 .procname       = "nr_open",
1270                 .data           = &sysctl_nr_open,
1271                 .maxlen         = sizeof(int),
1272                 .mode           = 0644,
1273                 .proc_handler   = &proc_dointvec_minmax,
1274                 .extra1         = &sysctl_nr_open_min,
1275                 .extra2         = &sysctl_nr_open_max,
1276         },
1277         {
1278                 .ctl_name       = FS_DENTRY,
1279                 .procname       = "dentry-state",
1280                 .data           = &dentry_stat,
1281                 .maxlen         = 6*sizeof(int),
1282                 .mode           = 0444,
1283                 .proc_handler   = &proc_dointvec,
1284         },
1285         {
1286                 .ctl_name       = FS_OVERFLOWUID,
1287                 .procname       = "overflowuid",
1288                 .data           = &fs_overflowuid,
1289                 .maxlen         = sizeof(int),
1290                 .mode           = 0644,
1291                 .proc_handler   = &proc_dointvec_minmax,
1292                 .strategy       = &sysctl_intvec,
1293                 .extra1         = &minolduid,
1294                 .extra2         = &maxolduid,
1295         },
1296         {
1297                 .ctl_name       = FS_OVERFLOWGID,
1298                 .procname       = "overflowgid",
1299                 .data           = &fs_overflowgid,
1300                 .maxlen         = sizeof(int),
1301                 .mode           = 0644,
1302                 .proc_handler   = &proc_dointvec_minmax,
1303                 .strategy       = &sysctl_intvec,
1304                 .extra1         = &minolduid,
1305                 .extra2         = &maxolduid,
1306         },
1307 #ifdef CONFIG_FILE_LOCKING
1308         {
1309                 .ctl_name       = FS_LEASES,
1310                 .procname       = "leases-enable",
1311                 .data           = &leases_enable,
1312                 .maxlen         = sizeof(int),
1313                 .mode           = 0644,
1314                 .proc_handler   = &proc_dointvec,
1315         },
1316 #endif
1317 #ifdef CONFIG_DNOTIFY
1318         {
1319                 .ctl_name       = FS_DIR_NOTIFY,
1320                 .procname       = "dir-notify-enable",
1321                 .data           = &dir_notify_enable,
1322                 .maxlen         = sizeof(int),
1323                 .mode           = 0644,
1324                 .proc_handler   = &proc_dointvec,
1325         },
1326 #endif
1327 #ifdef CONFIG_MMU
1328 #ifdef CONFIG_FILE_LOCKING
1329         {
1330                 .ctl_name       = FS_LEASE_TIME,
1331                 .procname       = "lease-break-time",
1332                 .data           = &lease_break_time,
1333                 .maxlen         = sizeof(int),
1334                 .mode           = 0644,
1335                 .proc_handler   = &proc_dointvec_minmax,
1336                 .strategy       = &sysctl_intvec,
1337                 .extra1         = &zero,
1338                 .extra2         = &two,
1339         },
1340 #endif
1341 #ifdef CONFIG_AIO
1342         {
1343                 .procname       = "aio-nr",
1344                 .data           = &aio_nr,
1345                 .maxlen         = sizeof(aio_nr),
1346                 .mode           = 0444,
1347                 .proc_handler   = &proc_doulongvec_minmax,
1348         },
1349         {
1350                 .procname       = "aio-max-nr",
1351                 .data           = &aio_max_nr,
1352                 .maxlen         = sizeof(aio_max_nr),
1353                 .mode           = 0644,
1354                 .proc_handler   = &proc_doulongvec_minmax,
1355         },
1356 #endif /* CONFIG_AIO */
1357 #ifdef CONFIG_INOTIFY_USER
1358         {
1359                 .ctl_name       = FS_INOTIFY,
1360                 .procname       = "inotify",
1361                 .mode           = 0555,
1362                 .child          = inotify_table,
1363         },
1364 #endif
1365 #ifdef CONFIG_EPOLL
1366         {
1367                 .procname       = "epoll",
1368                 .mode           = 0555,
1369                 .child          = epoll_table,
1370         },
1371 #endif
1372 #endif
1373         {
1374                 .ctl_name       = KERN_SETUID_DUMPABLE,
1375                 .procname       = "suid_dumpable",
1376                 .data           = &suid_dumpable,
1377                 .maxlen         = sizeof(int),
1378                 .mode           = 0644,
1379                 .proc_handler   = &proc_dointvec,
1380         },
1381 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1382         {
1383                 .ctl_name       = CTL_UNNUMBERED,
1384                 .procname       = "binfmt_misc",
1385                 .mode           = 0555,
1386                 .child          = binfmt_misc_table,
1387         },
1388 #endif
1389 /*
1390  * NOTE: do not add new entries to this table unless you have read
1391  * Documentation/sysctl/ctl_unnumbered.txt
1392  */
1393         { .ctl_name = 0 }
1394 };
1395
1396 static struct ctl_table debug_table[] = {
1397 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1398         {
1399                 .ctl_name       = CTL_UNNUMBERED,
1400                 .procname       = "exception-trace",
1401                 .data           = &show_unhandled_signals,
1402                 .maxlen         = sizeof(int),
1403                 .mode           = 0644,
1404                 .proc_handler   = proc_dointvec
1405         },
1406 #endif
1407         { .ctl_name = 0 }
1408 };
1409
1410 static struct ctl_table dev_table[] = {
1411         { .ctl_name = 0 }
1412 };
1413
1414 static DEFINE_SPINLOCK(sysctl_lock);
1415
1416 /* called under sysctl_lock */
1417 static int use_table(struct ctl_table_header *p)
1418 {
1419         if (unlikely(p->unregistering))
1420                 return 0;
1421         p->used++;
1422         return 1;
1423 }
1424
1425 /* called under sysctl_lock */
1426 static void unuse_table(struct ctl_table_header *p)
1427 {
1428         if (!--p->used)
1429                 if (unlikely(p->unregistering))
1430                         complete(p->unregistering);
1431 }
1432
1433 /* called under sysctl_lock, will reacquire if has to wait */
1434 static void start_unregistering(struct ctl_table_header *p)
1435 {
1436         /*
1437          * if p->used is 0, nobody will ever touch that entry again;
1438          * we'll eliminate all paths to it before dropping sysctl_lock
1439          */
1440         if (unlikely(p->used)) {
1441                 struct completion wait;
1442                 init_completion(&wait);
1443                 p->unregistering = &wait;
1444                 spin_unlock(&sysctl_lock);
1445                 wait_for_completion(&wait);
1446                 spin_lock(&sysctl_lock);
1447         } else {
1448                 /* anything non-NULL; we'll never dereference it */
1449                 p->unregistering = ERR_PTR(-EINVAL);
1450         }
1451         /*
1452          * do not remove from the list until nobody holds it; walking the
1453          * list in do_sysctl() relies on that.
1454          */
1455         list_del_init(&p->ctl_entry);
1456 }
1457
1458 void sysctl_head_get(struct ctl_table_header *head)
1459 {
1460         spin_lock(&sysctl_lock);
1461         head->count++;
1462         spin_unlock(&sysctl_lock);
1463 }
1464
1465 void sysctl_head_put(struct ctl_table_header *head)
1466 {
1467         spin_lock(&sysctl_lock);
1468         if (!--head->count)
1469                 kfree(head);
1470         spin_unlock(&sysctl_lock);
1471 }
1472
1473 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1474 {
1475         if (!head)
1476                 BUG();
1477         spin_lock(&sysctl_lock);
1478         if (!use_table(head))
1479                 head = ERR_PTR(-ENOENT);
1480         spin_unlock(&sysctl_lock);
1481         return head;
1482 }
1483
1484 void sysctl_head_finish(struct ctl_table_header *head)
1485 {
1486         if (!head)
1487                 return;
1488         spin_lock(&sysctl_lock);
1489         unuse_table(head);
1490         spin_unlock(&sysctl_lock);
1491 }
1492
1493 static struct ctl_table_set *
1494 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1495 {
1496         struct ctl_table_set *set = &root->default_set;
1497         if (root->lookup)
1498                 set = root->lookup(root, namespaces);
1499         return set;
1500 }
1501
1502 static struct list_head *
1503 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1504 {
1505         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1506         return &set->list;
1507 }
1508
1509 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1510                                             struct ctl_table_header *prev)
1511 {
1512         struct ctl_table_root *root;
1513         struct list_head *header_list;
1514         struct ctl_table_header *head;
1515         struct list_head *tmp;
1516
1517         spin_lock(&sysctl_lock);
1518         if (prev) {
1519                 head = prev;
1520                 tmp = &prev->ctl_entry;
1521                 unuse_table(prev);
1522                 goto next;
1523         }
1524         tmp = &root_table_header.ctl_entry;
1525         for (;;) {
1526                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1527
1528                 if (!use_table(head))
1529                         goto next;
1530                 spin_unlock(&sysctl_lock);
1531                 return head;
1532         next:
1533                 root = head->root;
1534                 tmp = tmp->next;
1535                 header_list = lookup_header_list(root, namespaces);
1536                 if (tmp != header_list)
1537                         continue;
1538
1539                 do {
1540                         root = list_entry(root->root_list.next,
1541                                         struct ctl_table_root, root_list);
1542                         if (root == &sysctl_table_root)
1543                                 goto out;
1544                         header_list = lookup_header_list(root, namespaces);
1545                 } while (list_empty(header_list));
1546                 tmp = header_list->next;
1547         }
1548 out:
1549         spin_unlock(&sysctl_lock);
1550         return NULL;
1551 }
1552
1553 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1554 {
1555         return __sysctl_head_next(current->nsproxy, prev);
1556 }
1557
1558 void register_sysctl_root(struct ctl_table_root *root)
1559 {
1560         spin_lock(&sysctl_lock);
1561         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1562         spin_unlock(&sysctl_lock);
1563 }
1564
1565 #ifdef CONFIG_SYSCTL_SYSCALL
1566 /* Perform the actual read/write of a sysctl table entry. */
1567 static int do_sysctl_strategy(struct ctl_table_root *root,
1568                         struct ctl_table *table,
1569                         void __user *oldval, size_t __user *oldlenp,
1570                         void __user *newval, size_t newlen)
1571 {
1572         int op = 0, rc;
1573
1574         if (oldval)
1575                 op |= MAY_READ;
1576         if (newval)
1577                 op |= MAY_WRITE;
1578         if (sysctl_perm(root, table, op))
1579                 return -EPERM;
1580
1581         if (table->strategy) {
1582                 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1583                 if (rc < 0)
1584                         return rc;
1585                 if (rc > 0)
1586                         return 0;
1587         }
1588
1589         /* If there is no strategy routine, or if the strategy returns
1590          * zero, proceed with automatic r/w */
1591         if (table->data && table->maxlen) {
1592                 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1593                 if (rc < 0)
1594                         return rc;
1595         }
1596         return 0;
1597 }
1598
1599 static int parse_table(int __user *name, int nlen,
1600                        void __user *oldval, size_t __user *oldlenp,
1601                        void __user *newval, size_t newlen,
1602                        struct ctl_table_root *root,
1603                        struct ctl_table *table)
1604 {
1605         int n;
1606 repeat:
1607         if (!nlen)
1608                 return -ENOTDIR;
1609         if (get_user(n, name))
1610                 return -EFAULT;
1611         for ( ; table->ctl_name || table->procname; table++) {
1612                 if (!table->ctl_name)
1613                         continue;
1614                 if (n == table->ctl_name) {
1615                         int error;
1616                         if (table->child) {
1617                                 if (sysctl_perm(root, table, MAY_EXEC))
1618                                         return -EPERM;
1619                                 name++;
1620                                 nlen--;
1621                                 table = table->child;
1622                                 goto repeat;
1623                         }
1624                         error = do_sysctl_strategy(root, table,
1625                                                    oldval, oldlenp,
1626                                                    newval, newlen);
1627                         return error;
1628                 }
1629         }
1630         return -ENOTDIR;
1631 }
1632
1633 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1634                void __user *newval, size_t newlen)
1635 {
1636         struct ctl_table_header *head;
1637         int error = -ENOTDIR;
1638
1639         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1640                 return -ENOTDIR;
1641         if (oldval) {
1642                 int old_len;
1643                 if (!oldlenp || get_user(old_len, oldlenp))
1644                         return -EFAULT;
1645         }
1646
1647         for (head = sysctl_head_next(NULL); head;
1648                         head = sysctl_head_next(head)) {
1649                 error = parse_table(name, nlen, oldval, oldlenp,
1650                                         newval, newlen,
1651                                         head->root, head->ctl_table);
1652                 if (error != -ENOTDIR) {
1653                         sysctl_head_finish(head);
1654                         break;
1655                 }
1656         }
1657         return error;
1658 }
1659
1660 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1661 {
1662         struct __sysctl_args tmp;
1663         int error;
1664
1665         if (copy_from_user(&tmp, args, sizeof(tmp)))
1666                 return -EFAULT;
1667
1668         error = deprecated_sysctl_warning(&tmp);
1669         if (error)
1670                 goto out;
1671
1672         lock_kernel();
1673         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1674                           tmp.newval, tmp.newlen);
1675         unlock_kernel();
1676 out:
1677         return error;
1678 }
1679 #endif /* CONFIG_SYSCTL_SYSCALL */
1680
1681 /*
1682  * sysctl_perm does NOT grant the superuser all rights automatically, because
1683  * some sysctl variables are readonly even to root.
1684  */
1685
1686 static int test_perm(int mode, int op)
1687 {
1688         if (!current_euid())
1689                 mode >>= 6;
1690         else if (in_egroup_p(0))
1691                 mode >>= 3;
1692         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1693                 return 0;
1694         return -EACCES;
1695 }
1696
1697 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1698 {
1699         int error;
1700         int mode;
1701
1702         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1703         if (error)
1704                 return error;
1705
1706         if (root->permissions)
1707                 mode = root->permissions(root, current->nsproxy, table);
1708         else
1709                 mode = table->mode;
1710
1711         return test_perm(mode, op);
1712 }
1713
1714 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1715 {
1716         for (; table->ctl_name || table->procname; table++) {
1717                 table->parent = parent;
1718                 if (table->child)
1719                         sysctl_set_parent(table, table->child);
1720         }
1721 }
1722
1723 static __init int sysctl_init(void)
1724 {
1725         sysctl_set_parent(NULL, root_table);
1726 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1727         {
1728                 int err;
1729                 err = sysctl_check_table(current->nsproxy, root_table);
1730         }
1731 #endif
1732         return 0;
1733 }
1734
1735 core_initcall(sysctl_init);
1736
1737 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1738                                       struct ctl_table *table)
1739 {
1740         struct ctl_table *p;
1741         const char *s = branch->procname;
1742
1743         /* branch should have named subdirectory as its first element */
1744         if (!s || !branch->child)
1745                 return NULL;
1746
1747         /* ... and nothing else */
1748         if (branch[1].procname || branch[1].ctl_name)
1749                 return NULL;
1750
1751         /* table should contain subdirectory with the same name */
1752         for (p = table; p->procname || p->ctl_name; p++) {
1753                 if (!p->child)
1754                         continue;
1755                 if (p->procname && strcmp(p->procname, s) == 0)
1756                         return p;
1757         }
1758         return NULL;
1759 }
1760
1761 /* see if attaching q to p would be an improvement */
1762 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1763 {
1764         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1765         struct ctl_table *next;
1766         int is_better = 0;
1767         int not_in_parent = !p->attached_by;
1768
1769         while ((next = is_branch_in(by, to)) != NULL) {
1770                 if (by == q->attached_by)
1771                         is_better = 1;
1772                 if (to == p->attached_by)
1773                         not_in_parent = 1;
1774                 by = by->child;
1775                 to = next->child;
1776         }
1777
1778         if (is_better && not_in_parent) {
1779                 q->attached_by = by;
1780                 q->attached_to = to;
1781                 q->parent = p;
1782         }
1783 }
1784
1785 /**
1786  * __register_sysctl_paths - register a sysctl hierarchy
1787  * @root: List of sysctl headers to register on
1788  * @namespaces: Data to compute which lists of sysctl entries are visible
1789  * @path: The path to the directory the sysctl table is in.
1790  * @table: the top-level table structure
1791  *
1792  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1793  * array. A completely 0 filled entry terminates the table.
1794  *
1795  * The members of the &struct ctl_table structure are used as follows:
1796  *
1797  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1798  *            must be unique within that level of sysctl
1799  *
1800  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1801  *            enter a sysctl file
1802  *
1803  * data - a pointer to data for use by proc_handler
1804  *
1805  * maxlen - the maximum size in bytes of the data
1806  *
1807  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1808  *
1809  * child - a pointer to the child sysctl table if this entry is a directory, or
1810  *         %NULL.
1811  *
1812  * proc_handler - the text handler routine (described below)
1813  *
1814  * strategy - the strategy routine (described below)
1815  *
1816  * de - for internal use by the sysctl routines
1817  *
1818  * extra1, extra2 - extra pointers usable by the proc handler routines
1819  *
1820  * Leaf nodes in the sysctl tree will be represented by a single file
1821  * under /proc; non-leaf nodes will be represented by directories.
1822  *
1823  * sysctl(2) can automatically manage read and write requests through
1824  * the sysctl table.  The data and maxlen fields of the ctl_table
1825  * struct enable minimal validation of the values being written to be
1826  * performed, and the mode field allows minimal authentication.
1827  *
1828  * More sophisticated management can be enabled by the provision of a
1829  * strategy routine with the table entry.  This will be called before
1830  * any automatic read or write of the data is performed.
1831  *
1832  * The strategy routine may return
1833  *
1834  * < 0 - Error occurred (error is passed to user process)
1835  *
1836  * 0   - OK - proceed with automatic read or write.
1837  *
1838  * > 0 - OK - read or write has been done by the strategy routine, so
1839  *       return immediately.
1840  *
1841  * There must be a proc_handler routine for any terminal nodes
1842  * mirrored under /proc/sys (non-terminals are handled by a built-in
1843  * directory handler).  Several default handlers are available to
1844  * cover common cases -
1845  *
1846  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1847  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1848  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1849  *
1850  * It is the handler's job to read the input buffer from user memory
1851  * and process it. The handler should return 0 on success.
1852  *
1853  * This routine returns %NULL on a failure to register, and a pointer
1854  * to the table header on success.
1855  */
1856 struct ctl_table_header *__register_sysctl_paths(
1857         struct ctl_table_root *root,
1858         struct nsproxy *namespaces,
1859         const struct ctl_path *path, struct ctl_table *table)
1860 {
1861         struct ctl_table_header *header;
1862         struct ctl_table *new, **prevp;
1863         unsigned int n, npath;
1864         struct ctl_table_set *set;
1865
1866         /* Count the path components */
1867         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1868                 ;
1869
1870         /*
1871          * For each path component, allocate a 2-element ctl_table array.
1872          * The first array element will be filled with the sysctl entry
1873          * for this, the second will be the sentinel (ctl_name == 0).
1874          *
1875          * We allocate everything in one go so that we don't have to
1876          * worry about freeing additional memory in unregister_sysctl_table.
1877          */
1878         header = kzalloc(sizeof(struct ctl_table_header) +
1879                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1880         if (!header)
1881                 return NULL;
1882
1883         new = (struct ctl_table *) (header + 1);
1884
1885         /* Now connect the dots */
1886         prevp = &header->ctl_table;
1887         for (n = 0; n < npath; ++n, ++path) {
1888                 /* Copy the procname */
1889                 new->procname = path->procname;
1890                 new->ctl_name = path->ctl_name;
1891                 new->mode     = 0555;
1892
1893                 *prevp = new;
1894                 prevp = &new->child;
1895
1896                 new += 2;
1897         }
1898         *prevp = table;
1899         header->ctl_table_arg = table;
1900
1901         INIT_LIST_HEAD(&header->ctl_entry);
1902         header->used = 0;
1903         header->unregistering = NULL;
1904         header->root = root;
1905         sysctl_set_parent(NULL, header->ctl_table);
1906         header->count = 1;
1907 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1908         if (sysctl_check_table(namespaces, header->ctl_table)) {
1909                 kfree(header);
1910                 return NULL;
1911         }
1912 #endif
1913         spin_lock(&sysctl_lock);
1914         header->set = lookup_header_set(root, namespaces);
1915         header->attached_by = header->ctl_table;
1916         header->attached_to = root_table;
1917         header->parent = &root_table_header;
1918         for (set = header->set; set; set = set->parent) {
1919                 struct ctl_table_header *p;
1920                 list_for_each_entry(p, &set->list, ctl_entry) {
1921                         if (p->unregistering)
1922                                 continue;
1923                         try_attach(p, header);
1924                 }
1925         }
1926         header->parent->count++;
1927         list_add_tail(&header->ctl_entry, &header->set->list);
1928         spin_unlock(&sysctl_lock);
1929
1930         return header;
1931 }
1932
1933 /**
1934  * register_sysctl_table_path - register a sysctl table hierarchy
1935  * @path: The path to the directory the sysctl table is in.
1936  * @table: the top-level table structure
1937  *
1938  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1939  * array. A completely 0 filled entry terminates the table.
1940  *
1941  * See __register_sysctl_paths for more details.
1942  */
1943 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1944                                                 struct ctl_table *table)
1945 {
1946         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1947                                         path, table);
1948 }
1949
1950 /**
1951  * register_sysctl_table - register a sysctl table hierarchy
1952  * @table: the top-level table structure
1953  *
1954  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1955  * array. A completely 0 filled entry terminates the table.
1956  *
1957  * See register_sysctl_paths for more details.
1958  */
1959 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1960 {
1961         static const struct ctl_path null_path[] = { {} };
1962
1963         return register_sysctl_paths(null_path, table);
1964 }
1965
1966 /**
1967  * unregister_sysctl_table - unregister a sysctl table hierarchy
1968  * @header: the header returned from register_sysctl_table
1969  *
1970  * Unregisters the sysctl table and all children. proc entries may not
1971  * actually be removed until they are no longer used by anyone.
1972  */
1973 void unregister_sysctl_table(struct ctl_table_header * header)
1974 {
1975         might_sleep();
1976
1977         if (header == NULL)
1978                 return;
1979
1980         spin_lock(&sysctl_lock);
1981         start_unregistering(header);
1982         if (!--header->parent->count) {
1983                 WARN_ON(1);
1984                 kfree(header->parent);
1985         }
1986         if (!--header->count)
1987                 kfree(header);
1988         spin_unlock(&sysctl_lock);
1989 }
1990
1991 int sysctl_is_seen(struct ctl_table_header *p)
1992 {
1993         struct ctl_table_set *set = p->set;
1994         int res;
1995         spin_lock(&sysctl_lock);
1996         if (p->unregistering)
1997                 res = 0;
1998         else if (!set->is_seen)
1999                 res = 1;
2000         else
2001                 res = set->is_seen(set);
2002         spin_unlock(&sysctl_lock);
2003         return res;
2004 }
2005
2006 void setup_sysctl_set(struct ctl_table_set *p,
2007         struct ctl_table_set *parent,
2008         int (*is_seen)(struct ctl_table_set *))
2009 {
2010         INIT_LIST_HEAD(&p->list);
2011         p->parent = parent ? parent : &sysctl_table_root.default_set;
2012         p->is_seen = is_seen;
2013 }
2014
2015 #else /* !CONFIG_SYSCTL */
2016 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2017 {
2018         return NULL;
2019 }
2020
2021 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2022                                                     struct ctl_table *table)
2023 {
2024         return NULL;
2025 }
2026
2027 void unregister_sysctl_table(struct ctl_table_header * table)
2028 {
2029 }
2030
2031 void setup_sysctl_set(struct ctl_table_set *p,
2032         struct ctl_table_set *parent,
2033         int (*is_seen)(struct ctl_table_set *))
2034 {
2035 }
2036
2037 void sysctl_head_put(struct ctl_table_header *head)
2038 {
2039 }
2040
2041 #endif /* CONFIG_SYSCTL */
2042
2043 /*
2044  * /proc/sys support
2045  */
2046
2047 #ifdef CONFIG_PROC_SYSCTL
2048
2049 static int _proc_do_string(void* data, int maxlen, int write,
2050                            struct file *filp, void __user *buffer,
2051                            size_t *lenp, loff_t *ppos)
2052 {
2053         size_t len;
2054         char __user *p;
2055         char c;
2056
2057         if (!data || !maxlen || !*lenp) {
2058                 *lenp = 0;
2059                 return 0;
2060         }
2061
2062         if (write) {
2063                 len = 0;
2064                 p = buffer;
2065                 while (len < *lenp) {
2066                         if (get_user(c, p++))
2067                                 return -EFAULT;
2068                         if (c == 0 || c == '\n')
2069                                 break;
2070                         len++;
2071                 }
2072                 if (len >= maxlen)
2073                         len = maxlen-1;
2074                 if(copy_from_user(data, buffer, len))
2075                         return -EFAULT;
2076                 ((char *) data)[len] = 0;
2077                 *ppos += *lenp;
2078         } else {
2079                 len = strlen(data);
2080                 if (len > maxlen)
2081                         len = maxlen;
2082
2083                 if (*ppos > len) {
2084                         *lenp = 0;
2085                         return 0;
2086                 }
2087
2088                 data += *ppos;
2089                 len  -= *ppos;
2090
2091                 if (len > *lenp)
2092                         len = *lenp;
2093                 if (len)
2094                         if(copy_to_user(buffer, data, len))
2095                                 return -EFAULT;
2096                 if (len < *lenp) {
2097                         if(put_user('\n', ((char __user *) buffer) + len))
2098                                 return -EFAULT;
2099                         len++;
2100                 }
2101                 *lenp = len;
2102                 *ppos += len;
2103         }
2104         return 0;
2105 }
2106
2107 /**
2108  * proc_dostring - read a string sysctl
2109  * @table: the sysctl table
2110  * @write: %TRUE if this is a write to the sysctl file
2111  * @filp: the file structure
2112  * @buffer: the user buffer
2113  * @lenp: the size of the user buffer
2114  * @ppos: file position
2115  *
2116  * Reads/writes a string from/to the user buffer. If the kernel
2117  * buffer provided is not large enough to hold the string, the
2118  * string is truncated. The copied string is %NULL-terminated.
2119  * If the string is being read by the user process, it is copied
2120  * and a newline '\n' is added. It is truncated if the buffer is
2121  * not large enough.
2122  *
2123  * Returns 0 on success.
2124  */
2125 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2126                   void __user *buffer, size_t *lenp, loff_t *ppos)
2127 {
2128         return _proc_do_string(table->data, table->maxlen, write, filp,
2129                                buffer, lenp, ppos);
2130 }
2131
2132
2133 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2134                                  int *valp,
2135                                  int write, void *data)
2136 {
2137         if (write) {
2138                 *valp = *negp ? -*lvalp : *lvalp;
2139         } else {
2140                 int val = *valp;
2141                 if (val < 0) {
2142                         *negp = -1;
2143                         *lvalp = (unsigned long)-val;
2144                 } else {
2145                         *negp = 0;
2146                         *lvalp = (unsigned long)val;
2147                 }
2148         }
2149         return 0;
2150 }
2151
2152 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2153                   int write, struct file *filp, void __user *buffer,
2154                   size_t *lenp, loff_t *ppos,
2155                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2156                               int write, void *data),
2157                   void *data)
2158 {
2159 #define TMPBUFLEN 21
2160         int *i, vleft, first=1, neg, val;
2161         unsigned long lval;
2162         size_t left, len;
2163
2164         char buf[TMPBUFLEN], *p;
2165         char __user *s = buffer;
2166
2167         if (!tbl_data || !table->maxlen || !*lenp ||
2168             (*ppos && !write)) {
2169                 *lenp = 0;
2170                 return 0;
2171         }
2172
2173         i = (int *) tbl_data;
2174         vleft = table->maxlen / sizeof(*i);
2175         left = *lenp;
2176
2177         if (!conv)
2178                 conv = do_proc_dointvec_conv;
2179
2180         for (; left && vleft--; i++, first=0) {
2181                 if (write) {
2182                         while (left) {
2183                                 char c;
2184                                 if (get_user(c, s))
2185                                         return -EFAULT;
2186                                 if (!isspace(c))
2187                                         break;
2188                                 left--;
2189                                 s++;
2190                         }
2191                         if (!left)
2192                                 break;
2193                         neg = 0;
2194                         len = left;
2195                         if (len > sizeof(buf) - 1)
2196                                 len = sizeof(buf) - 1;
2197                         if (copy_from_user(buf, s, len))
2198                                 return -EFAULT;
2199                         buf[len] = 0;
2200                         p = buf;
2201                         if (*p == '-' && left > 1) {
2202                                 neg = 1;
2203                                 p++;
2204                         }
2205                         if (*p < '0' || *p > '9')
2206                                 break;
2207
2208                         lval = simple_strtoul(p, &p, 0);
2209
2210                         len = p-buf;
2211                         if ((len < left) && *p && !isspace(*p))
2212                                 break;
2213                         if (neg)
2214                                 val = -val;
2215                         s += len;
2216                         left -= len;
2217
2218                         if (conv(&neg, &lval, i, 1, data))
2219                                 break;
2220                 } else {
2221                         p = buf;
2222                         if (!first)
2223                                 *p++ = '\t';
2224
2225                         if (conv(&neg, &lval, i, 0, data))
2226                                 break;
2227
2228                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2229                         len = strlen(buf);
2230                         if (len > left)
2231                                 len = left;
2232                         if(copy_to_user(s, buf, len))
2233                                 return -EFAULT;
2234                         left -= len;
2235                         s += len;
2236                 }
2237         }
2238
2239         if (!write && !first && left) {
2240                 if(put_user('\n', s))
2241                         return -EFAULT;
2242                 left--, s++;
2243         }
2244         if (write) {
2245                 while (left) {
2246                         char c;
2247                         if (get_user(c, s++))
2248                                 return -EFAULT;
2249                         if (!isspace(c))
2250                                 break;
2251                         left--;
2252                 }
2253         }
2254         if (write && first)
2255                 return -EINVAL;
2256         *lenp -= left;
2257         *ppos += *lenp;
2258         return 0;
2259 #undef TMPBUFLEN
2260 }
2261
2262 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2263                   void __user *buffer, size_t *lenp, loff_t *ppos,
2264                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2265                               int write, void *data),
2266                   void *data)
2267 {
2268         return __do_proc_dointvec(table->data, table, write, filp,
2269                         buffer, lenp, ppos, conv, data);
2270 }
2271
2272 /**
2273  * proc_dointvec - read a vector of integers
2274  * @table: the sysctl table
2275  * @write: %TRUE if this is a write to the sysctl file
2276  * @filp: the file structure
2277  * @buffer: the user buffer
2278  * @lenp: the size of the user buffer
2279  * @ppos: file position
2280  *
2281  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2282  * values from/to the user buffer, treated as an ASCII string.
2283  *
2284  * Returns 0 on success.
2285  */
2286 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2287                      void __user *buffer, size_t *lenp, loff_t *ppos)
2288 {
2289     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2290                             NULL,NULL);
2291 }
2292
2293 /*
2294  * Taint values can only be increased
2295  * This means we can safely use a temporary.
2296  */
2297 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2298                                void __user *buffer, size_t *lenp, loff_t *ppos)
2299 {
2300         struct ctl_table t;
2301         unsigned long tmptaint = get_taint();
2302         int err;
2303
2304         if (write && !capable(CAP_SYS_ADMIN))
2305                 return -EPERM;
2306
2307         t = *table;
2308         t.data = &tmptaint;
2309         err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2310         if (err < 0)
2311                 return err;
2312
2313         if (write) {
2314                 /*
2315                  * Poor man's atomic or. Not worth adding a primitive
2316                  * to everyone's atomic.h for this
2317                  */
2318                 int i;
2319                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2320                         if ((tmptaint >> i) & 1)
2321                                 add_taint(i);
2322                 }
2323         }
2324
2325         return err;
2326 }
2327
2328 struct do_proc_dointvec_minmax_conv_param {
2329         int *min;
2330         int *max;
2331 };
2332
2333 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2334                                         int *valp,
2335                                         int write, void *data)
2336 {
2337         struct do_proc_dointvec_minmax_conv_param *param = data;
2338         if (write) {
2339                 int val = *negp ? -*lvalp : *lvalp;
2340                 if ((param->min && *param->min > val) ||
2341                     (param->max && *param->max < val))
2342                         return -EINVAL;
2343                 *valp = val;
2344         } else {
2345                 int val = *valp;
2346                 if (val < 0) {
2347                         *negp = -1;
2348                         *lvalp = (unsigned long)-val;
2349                 } else {
2350                         *negp = 0;
2351                         *lvalp = (unsigned long)val;
2352                 }
2353         }
2354         return 0;
2355 }
2356
2357 /**
2358  * proc_dointvec_minmax - read a vector of integers with min/max values
2359  * @table: the sysctl table
2360  * @write: %TRUE if this is a write to the sysctl file
2361  * @filp: the file structure
2362  * @buffer: the user buffer
2363  * @lenp: the size of the user buffer
2364  * @ppos: file position
2365  *
2366  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2367  * values from/to the user buffer, treated as an ASCII string.
2368  *
2369  * This routine will ensure the values are within the range specified by
2370  * table->extra1 (min) and table->extra2 (max).
2371  *
2372  * Returns 0 on success.
2373  */
2374 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2375                   void __user *buffer, size_t *lenp, loff_t *ppos)
2376 {
2377         struct do_proc_dointvec_minmax_conv_param param = {
2378                 .min = (int *) table->extra1,
2379                 .max = (int *) table->extra2,
2380         };
2381         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2382                                 do_proc_dointvec_minmax_conv, &param);
2383 }
2384
2385 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2386                                      struct file *filp,
2387                                      void __user *buffer,
2388                                      size_t *lenp, loff_t *ppos,
2389                                      unsigned long convmul,
2390                                      unsigned long convdiv)
2391 {
2392 #define TMPBUFLEN 21
2393         unsigned long *i, *min, *max, val;
2394         int vleft, first=1, neg;
2395         size_t len, left;
2396         char buf[TMPBUFLEN], *p;
2397         char __user *s = buffer;
2398
2399         if (!data || !table->maxlen || !*lenp ||
2400             (*ppos && !write)) {
2401                 *lenp = 0;
2402                 return 0;
2403         }
2404
2405         i = (unsigned long *) data;
2406         min = (unsigned long *) table->extra1;
2407         max = (unsigned long *) table->extra2;
2408         vleft = table->maxlen / sizeof(unsigned long);
2409         left = *lenp;
2410
2411         for (; left && vleft--; i++, min++, max++, first=0) {
2412                 if (write) {
2413                         while (left) {
2414                                 char c;
2415                                 if (get_user(c, s))
2416                                         return -EFAULT;
2417                                 if (!isspace(c))
2418                                         break;
2419                                 left--;
2420                                 s++;
2421                         }
2422                         if (!left)
2423                                 break;
2424                         neg = 0;
2425                         len = left;
2426                         if (len > TMPBUFLEN-1)
2427                                 len = TMPBUFLEN-1;
2428                         if (copy_from_user(buf, s, len))
2429                                 return -EFAULT;
2430                         buf[len] = 0;
2431                         p = buf;
2432                         if (*p == '-' && left > 1) {
2433                                 neg = 1;
2434                                 p++;
2435                         }
2436                         if (*p < '0' || *p > '9')
2437                                 break;
2438                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2439                         len = p-buf;
2440                         if ((len < left) && *p && !isspace(*p))
2441                                 break;
2442                         if (neg)
2443                                 val = -val;
2444                         s += len;
2445                         left -= len;
2446
2447                         if(neg)
2448                                 continue;
2449                         if ((min && val < *min) || (max && val > *max))
2450                                 continue;
2451                         *i = val;
2452                 } else {
2453                         p = buf;
2454                         if (!first)
2455                                 *p++ = '\t';
2456                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2457                         len = strlen(buf);
2458                         if (len > left)
2459                                 len = left;
2460                         if(copy_to_user(s, buf, len))
2461                                 return -EFAULT;
2462                         left -= len;
2463                         s += len;
2464                 }
2465         }
2466
2467         if (!write && !first && left) {
2468                 if(put_user('\n', s))
2469                         return -EFAULT;
2470                 left--, s++;
2471         }
2472         if (write) {
2473                 while (left) {
2474                         char c;
2475                         if (get_user(c, s++))
2476                                 return -EFAULT;
2477                         if (!isspace(c))
2478                                 break;
2479                         left--;
2480                 }
2481         }
2482         if (write && first)
2483                 return -EINVAL;
2484         *lenp -= left;
2485         *ppos += *lenp;
2486         return 0;
2487 #undef TMPBUFLEN
2488 }
2489
2490 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2491                                      struct file *filp,
2492                                      void __user *buffer,
2493                                      size_t *lenp, loff_t *ppos,
2494                                      unsigned long convmul,
2495                                      unsigned long convdiv)
2496 {
2497         return __do_proc_doulongvec_minmax(table->data, table, write,
2498                         filp, buffer, lenp, ppos, convmul, convdiv);
2499 }
2500
2501 /**
2502  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2503  * @table: the sysctl table
2504  * @write: %TRUE if this is a write to the sysctl file
2505  * @filp: the file structure
2506  * @buffer: the user buffer
2507  * @lenp: the size of the user buffer
2508  * @ppos: file position
2509  *
2510  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2511  * values from/to the user buffer, treated as an ASCII string.
2512  *
2513  * This routine will ensure the values are within the range specified by
2514  * table->extra1 (min) and table->extra2 (max).
2515  *
2516  * Returns 0 on success.
2517  */
2518 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2519                            void __user *buffer, size_t *lenp, loff_t *ppos)
2520 {
2521     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2522 }
2523
2524 /**
2525  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2526  * @table: the sysctl table
2527  * @write: %TRUE if this is a write to the sysctl file
2528  * @filp: the file structure
2529  * @buffer: the user buffer
2530  * @lenp: the size of the user buffer
2531  * @ppos: file position
2532  *
2533  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2534  * values from/to the user buffer, treated as an ASCII string. The values
2535  * are treated as milliseconds, and converted to jiffies when they are stored.
2536  *
2537  * This routine will ensure the values are within the range specified by
2538  * table->extra1 (min) and table->extra2 (max).
2539  *
2540  * Returns 0 on success.
2541  */
2542 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2543                                       struct file *filp,
2544                                       void __user *buffer,
2545                                       size_t *lenp, loff_t *ppos)
2546 {
2547     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2548                                      lenp, ppos, HZ, 1000l);
2549 }
2550
2551
2552 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2553                                          int *valp,
2554                                          int write, void *data)
2555 {
2556         if (write) {
2557                 if (*lvalp > LONG_MAX / HZ)
2558                         return 1;
2559                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2560         } else {
2561                 int val = *valp;
2562                 unsigned long lval;
2563                 if (val < 0) {
2564                         *negp = -1;
2565                         lval = (unsigned long)-val;
2566                 } else {
2567                         *negp = 0;
2568                         lval = (unsigned long)val;
2569                 }
2570                 *lvalp = lval / HZ;
2571         }
2572         return 0;
2573 }
2574
2575 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2576                                                 int *valp,
2577                                                 int write, void *data)
2578 {
2579         if (write) {
2580                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2581                         return 1;
2582                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2583         } else {
2584                 int val = *valp;
2585                 unsigned long lval;
2586                 if (val < 0) {
2587                         *negp = -1;
2588                         lval = (unsigned long)-val;
2589                 } else {
2590                         *negp = 0;
2591                         lval = (unsigned long)val;
2592                 }
2593                 *lvalp = jiffies_to_clock_t(lval);
2594         }
2595         return 0;
2596 }
2597
2598 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2599                                             int *valp,
2600                                             int write, void *data)
2601 {
2602         if (write) {
2603                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2604         } else {
2605                 int val = *valp;
2606                 unsigned long lval;
2607                 if (val < 0) {
2608                         *negp = -1;
2609                         lval = (unsigned long)-val;
2610                 } else {
2611                         *negp = 0;
2612                         lval = (unsigned long)val;
2613                 }
2614                 *lvalp = jiffies_to_msecs(lval);
2615         }
2616         return 0;
2617 }
2618
2619 /**
2620  * proc_dointvec_jiffies - read a vector of integers as seconds
2621  * @table: the sysctl table
2622  * @write: %TRUE if this is a write to the sysctl file
2623  * @filp: the file structure
2624  * @buffer: the user buffer
2625  * @lenp: the size of the user buffer
2626  * @ppos: file position
2627  *
2628  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2629  * values from/to the user buffer, treated as an ASCII string.
2630  * The values read are assumed to be in seconds, and are converted into
2631  * jiffies.
2632  *
2633  * Returns 0 on success.
2634  */
2635 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2636                           void __user *buffer, size_t *lenp, loff_t *ppos)
2637 {
2638     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2639                             do_proc_dointvec_jiffies_conv,NULL);
2640 }
2641
2642 /**
2643  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2644  * @table: the sysctl table
2645  * @write: %TRUE if this is a write to the sysctl file
2646  * @filp: the file structure
2647  * @buffer: the user buffer
2648  * @lenp: the size of the user buffer
2649  * @ppos: pointer to the file position
2650  *
2651  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2652  * values from/to the user buffer, treated as an ASCII string.
2653  * The values read are assumed to be in 1/USER_HZ seconds, and
2654  * are converted into jiffies.
2655  *
2656  * Returns 0 on success.
2657  */
2658 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2659                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2660 {
2661     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2662                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2663 }
2664
2665 /**
2666  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2667  * @table: the sysctl table
2668  * @write: %TRUE if this is a write to the sysctl file
2669  * @filp: the file structure
2670  * @buffer: the user buffer
2671  * @lenp: the size of the user buffer
2672  * @ppos: file position
2673  * @ppos: the current position in the file
2674  *
2675  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2676  * values from/to the user buffer, treated as an ASCII string.
2677  * The values read are assumed to be in 1/1000 seconds, and
2678  * are converted into jiffies.
2679  *
2680  * Returns 0 on success.
2681  */
2682 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2683                              void __user *buffer, size_t *lenp, loff_t *ppos)
2684 {
2685         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2686                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2687 }
2688
2689 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2690                            void __user *buffer, size_t *lenp, loff_t *ppos)
2691 {
2692         struct pid *new_pid;
2693         pid_t tmp;
2694         int r;
2695
2696         tmp = pid_vnr(cad_pid);
2697
2698         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2699                                lenp, ppos, NULL, NULL);
2700         if (r || !write)
2701                 return r;
2702
2703         new_pid = find_get_pid(tmp);
2704         if (!new_pid)
2705                 return -ESRCH;
2706
2707         put_pid(xchg(&cad_pid, new_pid));
2708         return 0;
2709 }
2710
2711 #else /* CONFIG_PROC_FS */
2712
2713 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2714                   void __user *buffer, size_t *lenp, loff_t *ppos)
2715 {
2716         return -ENOSYS;
2717 }
2718
2719 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2720                   void __user *buffer, size_t *lenp, loff_t *ppos)
2721 {
2722         return -ENOSYS;
2723 }
2724
2725 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2726                     void __user *buffer, size_t *lenp, loff_t *ppos)
2727 {
2728         return -ENOSYS;
2729 }
2730
2731 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2732                     void __user *buffer, size_t *lenp, loff_t *ppos)
2733 {
2734         return -ENOSYS;
2735 }
2736
2737 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2738                     void __user *buffer, size_t *lenp, loff_t *ppos)
2739 {
2740         return -ENOSYS;
2741 }
2742
2743 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2744                              void __user *buffer, size_t *lenp, loff_t *ppos)
2745 {
2746         return -ENOSYS;
2747 }
2748
2749 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2750                     void __user *buffer, size_t *lenp, loff_t *ppos)
2751 {
2752         return -ENOSYS;
2753 }
2754
2755 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2756                                       struct file *filp,
2757                                       void __user *buffer,
2758                                       size_t *lenp, loff_t *ppos)
2759 {
2760     return -ENOSYS;
2761 }
2762
2763
2764 #endif /* CONFIG_PROC_FS */
2765
2766
2767 #ifdef CONFIG_SYSCTL_SYSCALL
2768 /*
2769  * General sysctl support routines
2770  */
2771
2772 /* The generic sysctl data routine (used if no strategy routine supplied) */
2773 int sysctl_data(struct ctl_table *table,
2774                 void __user *oldval, size_t __user *oldlenp,
2775                 void __user *newval, size_t newlen)
2776 {
2777         size_t len;
2778
2779         /* Get out of I don't have a variable */
2780         if (!table->data || !table->maxlen)
2781                 return -ENOTDIR;
2782
2783         if (oldval && oldlenp) {
2784                 if (get_user(len, oldlenp))
2785                         return -EFAULT;
2786                 if (len) {
2787                         if (len > table->maxlen)
2788                                 len = table->maxlen;
2789                         if (copy_to_user(oldval, table->data, len))
2790                                 return -EFAULT;
2791                         if (put_user(len, oldlenp))
2792                                 return -EFAULT;
2793                 }
2794         }
2795
2796         if (newval && newlen) {
2797                 if (newlen > table->maxlen)
2798                         newlen = table->maxlen;
2799
2800                 if (copy_from_user(table->data, newval, newlen))
2801                         return -EFAULT;
2802         }
2803         return 1;
2804 }
2805
2806 /* The generic string strategy routine: */
2807 int sysctl_string(struct ctl_table *table,
2808                   void __user *oldval, size_t __user *oldlenp,
2809                   void __user *newval, size_t newlen)
2810 {
2811         if (!table->data || !table->maxlen)
2812                 return -ENOTDIR;
2813
2814         if (oldval && oldlenp) {
2815                 size_t bufsize;
2816                 if (get_user(bufsize, oldlenp))
2817                         return -EFAULT;
2818                 if (bufsize) {
2819                         size_t len = strlen(table->data), copied;
2820
2821                         /* This shouldn't trigger for a well-formed sysctl */
2822                         if (len > table->maxlen)
2823                                 len = table->maxlen;
2824
2825                         /* Copy up to a max of bufsize-1 bytes of the string */
2826                         copied = (len >= bufsize) ? bufsize - 1 : len;
2827
2828                         if (copy_to_user(oldval, table->data, copied) ||
2829                             put_user(0, (char __user *)(oldval + copied)))
2830                                 return -EFAULT;
2831                         if (put_user(len, oldlenp))
2832                                 return -EFAULT;
2833                 }
2834         }
2835         if (newval && newlen) {
2836                 size_t len = newlen;
2837                 if (len > table->maxlen)
2838                         len = table->maxlen;
2839                 if(copy_from_user(table->data, newval, len))
2840                         return -EFAULT;
2841                 if (len == table->maxlen)
2842                         len--;
2843                 ((char *) table->data)[len] = 0;
2844         }
2845         return 1;
2846 }
2847
2848 /*
2849  * This function makes sure that all of the integers in the vector
2850  * are between the minimum and maximum values given in the arrays
2851  * table->extra1 and table->extra2, respectively.
2852  */
2853 int sysctl_intvec(struct ctl_table *table,
2854                 void __user *oldval, size_t __user *oldlenp,
2855                 void __user *newval, size_t newlen)
2856 {
2857
2858         if (newval && newlen) {
2859                 int __user *vec = (int __user *) newval;
2860                 int *min = (int *) table->extra1;
2861                 int *max = (int *) table->extra2;
2862                 size_t length;
2863                 int i;
2864
2865                 if (newlen % sizeof(int) != 0)
2866                         return -EINVAL;
2867
2868                 if (!table->extra1 && !table->extra2)
2869                         return 0;
2870
2871                 if (newlen > table->maxlen)
2872                         newlen = table->maxlen;
2873                 length = newlen / sizeof(int);
2874
2875                 for (i = 0; i < length; i++) {
2876                         int value;
2877                         if (get_user(value, vec + i))
2878                                 return -EFAULT;
2879                         if (min && value < min[i])
2880                                 return -EINVAL;
2881                         if (max && value > max[i])
2882                                 return -EINVAL;
2883                 }
2884         }
2885         return 0;
2886 }
2887
2888 /* Strategy function to convert jiffies to seconds */
2889 int sysctl_jiffies(struct ctl_table *table,
2890                 void __user *oldval, size_t __user *oldlenp,
2891                 void __user *newval, size_t newlen)
2892 {
2893         if (oldval && oldlenp) {
2894                 size_t olen;
2895
2896                 if (get_user(olen, oldlenp))
2897                         return -EFAULT;
2898                 if (olen) {
2899                         int val;
2900
2901                         if (olen < sizeof(int))
2902                                 return -EINVAL;
2903
2904                         val = *(int *)(table->data) / HZ;
2905                         if (put_user(val, (int __user *)oldval))
2906                                 return -EFAULT;
2907                         if (put_user(sizeof(int), oldlenp))
2908                                 return -EFAULT;
2909                 }
2910         }
2911         if (newval && newlen) {
2912                 int new;
2913                 if (newlen != sizeof(int))
2914                         return -EINVAL;
2915                 if (get_user(new, (int __user *)newval))
2916                         return -EFAULT;
2917                 *(int *)(table->data) = new*HZ;
2918         }
2919         return 1;
2920 }
2921
2922 /* Strategy function to convert jiffies to seconds */
2923 int sysctl_ms_jiffies(struct ctl_table *table,
2924                 void __user *oldval, size_t __user *oldlenp,
2925                 void __user *newval, size_t newlen)
2926 {
2927         if (oldval && oldlenp) {
2928                 size_t olen;
2929
2930                 if (get_user(olen, oldlenp))
2931                         return -EFAULT;
2932                 if (olen) {
2933                         int val;
2934
2935                         if (olen < sizeof(int))
2936                                 return -EINVAL;
2937
2938                         val = jiffies_to_msecs(*(int *)(table->data));
2939                         if (put_user(val, (int __user *)oldval))
2940                                 return -EFAULT;
2941                         if (put_user(sizeof(int), oldlenp))
2942                                 return -EFAULT;
2943                 }
2944         }
2945         if (newval && newlen) {
2946                 int new;
2947                 if (newlen != sizeof(int))
2948                         return -EINVAL;
2949                 if (get_user(new, (int __user *)newval))
2950                         return -EFAULT;
2951                 *(int *)(table->data) = msecs_to_jiffies(new);
2952         }
2953         return 1;
2954 }
2955
2956
2957
2958 #else /* CONFIG_SYSCTL_SYSCALL */
2959
2960
2961 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2962 {
2963         struct __sysctl_args tmp;
2964         int error;
2965
2966         if (copy_from_user(&tmp, args, sizeof(tmp)))
2967                 return -EFAULT;
2968
2969         error = deprecated_sysctl_warning(&tmp);
2970
2971         /* If no error reading the parameters then just -ENOSYS ... */
2972         if (!error)
2973                 error = -ENOSYS;
2974
2975         return error;
2976 }
2977
2978 int sysctl_data(struct ctl_table *table,
2979                   void __user *oldval, size_t __user *oldlenp,
2980                   void __user *newval, size_t newlen)
2981 {
2982         return -ENOSYS;
2983 }
2984
2985 int sysctl_string(struct ctl_table *table,
2986                   void __user *oldval, size_t __user *oldlenp,
2987                   void __user *newval, size_t newlen)
2988 {
2989         return -ENOSYS;
2990 }
2991
2992 int sysctl_intvec(struct ctl_table *table,
2993                 void __user *oldval, size_t __user *oldlenp,
2994                 void __user *newval, size_t newlen)
2995 {
2996         return -ENOSYS;
2997 }
2998
2999 int sysctl_jiffies(struct ctl_table *table,
3000                 void __user *oldval, size_t __user *oldlenp,
3001                 void __user *newval, size_t newlen)
3002 {
3003         return -ENOSYS;
3004 }
3005
3006 int sysctl_ms_jiffies(struct ctl_table *table,
3007                 void __user *oldval, size_t __user *oldlenp,
3008                 void __user *newval, size_t newlen)
3009 {
3010         return -ENOSYS;
3011 }
3012
3013 #endif /* CONFIG_SYSCTL_SYSCALL */
3014
3015 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3016 {
3017         static int msg_count;
3018         int name[CTL_MAXNAME];
3019         int i;
3020
3021         /* Check args->nlen. */
3022         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3023                 return -ENOTDIR;
3024
3025         /* Read in the sysctl name for better debug message logging */
3026         for (i = 0; i < args->nlen; i++)
3027                 if (get_user(name[i], args->name + i))
3028                         return -EFAULT;
3029
3030         /* Ignore accesses to kernel.version */
3031         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3032                 return 0;
3033
3034         if (msg_count < 5) {
3035                 msg_count++;
3036                 printk(KERN_INFO
3037                         "warning: process `%s' used the deprecated sysctl "
3038                         "system call with ", current->comm);
3039                 for (i = 0; i < args->nlen; i++)
3040                         printk("%d.", name[i]);
3041                 printk("\n");
3042         }
3043         return 0;
3044 }
3045
3046 /*
3047  * No sense putting this after each symbol definition, twice,
3048  * exception granted :-)
3049  */
3050 EXPORT_SYMBOL(proc_dointvec);
3051 EXPORT_SYMBOL(proc_dointvec_jiffies);
3052 EXPORT_SYMBOL(proc_dointvec_minmax);
3053 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3054 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3055 EXPORT_SYMBOL(proc_dostring);
3056 EXPORT_SYMBOL(proc_doulongvec_minmax);
3057 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3058 EXPORT_SYMBOL(register_sysctl_table);
3059 EXPORT_SYMBOL(register_sysctl_paths);
3060 EXPORT_SYMBOL(sysctl_intvec);
3061 EXPORT_SYMBOL(sysctl_jiffies);
3062 EXPORT_SYMBOL(sysctl_ms_jiffies);
3063 EXPORT_SYMBOL(sysctl_string);
3064 EXPORT_SYMBOL(sysctl_data);
3065 EXPORT_SYMBOL(unregister_sysctl_table);