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   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/kmemcheck.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 #include <linux/slow-work.h>
  52 #include <linux/perf_event.h>
  53
  54 #include <asm/uaccess.h>
  55 #include <asm/processor.h>
  56
  57 #ifdef CONFIG_X86
  58 #include <asm/nmi.h>
  59 #include <asm/stacktrace.h>
  60 #include <asm/io.h>
  61 #endif
  62
  63 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  64
  65 #if defined(CONFIG_SYSCTL)
  66
  67 /* External variables not in a header file. */
  68 extern int C_A_D;
  69 extern int print_fatal_signals;
  70 extern int sysctl_overcommit_memory;
  71 extern int sysctl_overcommit_ratio;
  72 extern int sysctl_panic_on_oom;
  73 extern int sysctl_oom_kill_allocating_task;
  74 extern int sysctl_oom_dump_tasks;
  75 extern int max_threads;
  76 extern int core_uses_pid;
  77 extern int suid_dumpable;
  78 extern char core_pattern[];
  79 extern int pid_max;
  80 extern int min_free_kbytes;
  81 extern int pid_max_min, pid_max_max;
  82 extern int sysctl_drop_caches;
  83 extern int percpu_pagelist_fraction;
  84 extern int compat_log;
  85 extern int latencytop_enabled;
  86 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  87 #ifndef CONFIG_MMU
  88 extern int sysctl_nr_trim_pages;
  89 #endif
  90 #ifdef CONFIG_RCU_TORTURE_TEST
  91 extern int rcutorture_runnable;
  92 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
  93 #ifdef CONFIG_BLOCK
  94 extern int blk_iopoll_enabled;
  95 #endif
  96
  97 /* Constants used for minimum and  maximum */
  98 #ifdef CONFIG_DETECT_SOFTLOCKUP
  99 static int sixty = 60;
 100 static int neg_one = -1;
 101 #endif
 102
 103 static int zero;
 104 static int __maybe_unused one = 1;
 105 static int __maybe_unused two = 2;
 106 static unsigned long one_ul = 1;
 107 static int one_hundred = 100;
 108 #ifdef CONFIG_PRINTK
 109 static int ten_thousand = 10000;
 110 #endif
 111
 112 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 113 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 114
 115 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 116 static int maxolduid = 65535;
 117 static int minolduid;
 118 static int min_percpu_pagelist_fract = 8;
 119
 120 static int ngroups_max = NGROUPS_MAX;
 121
 122 #ifdef CONFIG_MODULES
 123 extern char modprobe_path[];
 124 extern int modules_disabled;
 125 #endif
 126 #ifdef CONFIG_CHR_DEV_SG
 127 extern int sg_big_buff;
 128 #endif
 129
 130 #ifdef CONFIG_SPARC
 131 #include <asm/system.h>
 132 #endif
 133
 134 #ifdef CONFIG_SPARC64
 135 extern int sysctl_tsb_ratio;
 136 #endif
 137
 138 #ifdef __hppa__
 139 extern int pwrsw_enabled;
 140 extern int unaligned_enabled;
 141 #endif
 142
 143 #ifdef CONFIG_S390
 144 #ifdef CONFIG_MATHEMU
 145 extern int sysctl_ieee_emulation_warnings;
 146 #endif
 147 extern int sysctl_userprocess_debug;
 148 extern int spin_retry;
 149 #endif
 150
 151 #ifdef CONFIG_BSD_PROCESS_ACCT
 152 extern int acct_parm[];
 153 #endif
 154
 155 #ifdef CONFIG_IA64
 156 extern int no_unaligned_warning;
 157 extern int unaligned_dump_stack;
 158 #endif
 159
 160 #ifdef CONFIG_RT_MUTEXES
 161 extern int max_lock_depth;
 162 #endif
 163
 164 #ifdef CONFIG_PROC_SYSCTL
 165 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 166                   void __user *buffer, size_t *lenp, loff_t *ppos);
 167 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
 168                                void __user *buffer, size_t *lenp, loff_t *ppos);
 169 #endif
 170
 171 static struct ctl_table root_table[];
 172 static struct ctl_table_root sysctl_table_root;
 173 static struct ctl_table_header root_table_header = {
 174         .count = 1,
 175         .ctl_table = root_table,
 176         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
 177         .root = &sysctl_table_root,
 178         .set = &sysctl_table_root.default_set,
 179 };
 180 static struct ctl_table_root sysctl_table_root = {
 181         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 182         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 183 };
 184
 185 static struct ctl_table kern_table[];
 186 static struct ctl_table vm_table[];
 187 static struct ctl_table fs_table[];
 188 static struct ctl_table debug_table[];
 189 static struct ctl_table dev_table[];
 190 extern struct ctl_table random_table[];
 191 #ifdef CONFIG_INOTIFY_USER
 192 extern struct ctl_table inotify_table[];
 193 #endif
 194 #ifdef CONFIG_EPOLL
 195 extern struct ctl_table epoll_table[];
 196 #endif
 197
 198 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 199 int sysctl_legacy_va_layout;
 200 #endif
 201
 202 extern int prove_locking;
 203 extern int lock_stat;
 204
 205 /* The default sysctl tables: */
 206
 207 static struct ctl_table root_table[] = {
 208         {
 209                 .ctl_name       = CTL_KERN,
 210                 .procname       = "kernel",
 211                 .mode           = 0555,
 212                 .child          = kern_table,
 213         },
 214         {
 215                 .ctl_name       = CTL_VM,
 216                 .procname       = "vm",
 217                 .mode           = 0555,
 218                 .child          = vm_table,
 219         },
 220         {
 221                 .ctl_name       = CTL_FS,
 222                 .procname       = "fs",
 223                 .mode           = 0555,
 224                 .child          = fs_table,
 225         },
 226         {
 227                 .ctl_name       = CTL_DEBUG,
 228                 .procname       = "debug",
 229                 .mode           = 0555,
 230                 .child          = debug_table,
 231         },
 232         {
 233                 .ctl_name       = CTL_DEV,
 234                 .procname       = "dev",
 235                 .mode           = 0555,
 236                 .child          = dev_table,
 237         },
 238 /*
 239  * NOTE: do not add new entries to this table unless you have read
 240  * Documentation/sysctl/ctl_unnumbered.txt
 241  */
 242         { .ctl_name = 0 }
 243 };
 244
 245 #ifdef CONFIG_SCHED_DEBUG
 246 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 247 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 248 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 249 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 250 #endif
 251
 252 static struct ctl_table kern_table[] = {
 253         {
 254                 .ctl_name       = CTL_UNNUMBERED,
 255                 .procname       = "sched_child_runs_first",
 256                 .data           = &sysctl_sched_child_runs_first,
 257                 .maxlen         = sizeof(unsigned int),
 258                 .mode           = 0644,
 259                 .proc_handler   = &proc_dointvec,
 260         },
 261 #ifdef CONFIG_SCHED_DEBUG
 262         {
 263                 .ctl_name       = CTL_UNNUMBERED,
 264                 .procname       = "sched_min_granularity_ns",
 265                 .data           = &sysctl_sched_min_granularity,
 266                 .maxlen         = sizeof(unsigned int),
 267                 .mode           = 0644,
 268                 .proc_handler   = &sched_nr_latency_handler,
 269                 .strategy       = &sysctl_intvec,
 270                 .extra1         = &min_sched_granularity_ns,
 271                 .extra2         = &max_sched_granularity_ns,
 272         },
 273         {
 274                 .ctl_name       = CTL_UNNUMBERED,
 275                 .procname       = "sched_latency_ns",
 276                 .data           = &sysctl_sched_latency,
 277                 .maxlen         = sizeof(unsigned int),
 278                 .mode           = 0644,
 279                 .proc_handler   = &sched_nr_latency_handler,
 280                 .strategy       = &sysctl_intvec,
 281                 .extra1         = &min_sched_granularity_ns,
 282                 .extra2         = &max_sched_granularity_ns,
 283         },
 284         {
 285                 .ctl_name       = CTL_UNNUMBERED,
 286                 .procname       = "sched_wakeup_granularity_ns",
 287                 .data           = &sysctl_sched_wakeup_granularity,
 288                 .maxlen         = sizeof(unsigned int),
 289                 .mode           = 0644,
 290                 .proc_handler   = &proc_dointvec_minmax,
 291                 .strategy       = &sysctl_intvec,
 292                 .extra1         = &min_wakeup_granularity_ns,
 293                 .extra2         = &max_wakeup_granularity_ns,
 294         },
 295         {
 296                 .ctl_name       = CTL_UNNUMBERED,
 297                 .procname       = "sched_shares_ratelimit",
 298                 .data           = &sysctl_sched_shares_ratelimit,
 299                 .maxlen         = sizeof(unsigned int),
 300                 .mode           = 0644,
 301                 .proc_handler   = &proc_dointvec,
 302         },
 303         {
 304                 .ctl_name       = CTL_UNNUMBERED,
 305                 .procname       = "sched_shares_thresh",
 306                 .data           = &sysctl_sched_shares_thresh,
 307                 .maxlen         = sizeof(unsigned int),
 308                 .mode           = 0644,
 309                 .proc_handler   = &proc_dointvec_minmax,
 310                 .strategy       = &sysctl_intvec,
 311                 .extra1         = &zero,
 312         },
 313         {
 314                 .ctl_name       = CTL_UNNUMBERED,
 315                 .procname       = "sched_features",
 316                 .data           = &sysctl_sched_features,
 317                 .maxlen         = sizeof(unsigned int),
 318                 .mode           = 0644,
 319                 .proc_handler   = &proc_dointvec,
 320         },
 321         {
 322                 .ctl_name       = CTL_UNNUMBERED,
 323                 .procname       = "sched_migration_cost",
 324                 .data           = &sysctl_sched_migration_cost,
 325                 .maxlen         = sizeof(unsigned int),
 326                 .mode           = 0644,
 327                 .proc_handler   = &proc_dointvec,
 328         },
 329         {
 330                 .ctl_name       = CTL_UNNUMBERED,
 331                 .procname       = "sched_nr_migrate",
 332                 .data           = &sysctl_sched_nr_migrate,
 333                 .maxlen         = sizeof(unsigned int),
 334                 .mode           = 0644,
 335                 .proc_handler   = &proc_dointvec,
 336         },
 337         {
 338                 .ctl_name       = CTL_UNNUMBERED,
 339                 .procname       = "sched_time_avg",
 340                 .data           = &sysctl_sched_time_avg,
 341                 .maxlen         = sizeof(unsigned int),
 342                 .mode           = 0644,
 343                 .proc_handler   = &proc_dointvec,
 344         },
 345         {
 346                 .ctl_name       = CTL_UNNUMBERED,
 347                 .procname       = "timer_migration",
 348                 .data           = &sysctl_timer_migration,
 349                 .maxlen         = sizeof(unsigned int),
 350                 .mode           = 0644,
 351                 .proc_handler   = &proc_dointvec_minmax,
 352                 .strategy       = &sysctl_intvec,
 353                 .extra1         = &zero,
 354                 .extra2         = &one,
 355         },
 356 #endif
 357         {
 358                 .ctl_name       = CTL_UNNUMBERED,
 359                 .procname       = "sched_rt_period_us",
 360                 .data           = &sysctl_sched_rt_period,
 361                 .maxlen         = sizeof(unsigned int),
 362                 .mode           = 0644,
 363                 .proc_handler   = &sched_rt_handler,
 364         },
 365         {
 366                 .ctl_name       = CTL_UNNUMBERED,
 367                 .procname       = "sched_rt_runtime_us",
 368                 .data           = &sysctl_sched_rt_runtime,
 369                 .maxlen         = sizeof(int),
 370                 .mode           = 0644,
 371                 .proc_handler   = &sched_rt_handler,
 372         },
 373         {
 374                 .ctl_name       = CTL_UNNUMBERED,
 375                 .procname       = "sched_compat_yield",
 376                 .data           = &sysctl_sched_compat_yield,
 377                 .maxlen         = sizeof(unsigned int),
 378                 .mode           = 0644,
 379                 .proc_handler   = &proc_dointvec,
 380         },
 381 #ifdef CONFIG_PROVE_LOCKING
 382         {
 383                 .ctl_name       = CTL_UNNUMBERED,
 384                 .procname       = "prove_locking",
 385                 .data           = &prove_locking,
 386                 .maxlen         = sizeof(int),
 387                 .mode           = 0644,
 388                 .proc_handler   = &proc_dointvec,
 389         },
 390 #endif
 391 #ifdef CONFIG_LOCK_STAT
 392         {
 393                 .ctl_name       = CTL_UNNUMBERED,
 394                 .procname       = "lock_stat",
 395                 .data           = &lock_stat,
 396                 .maxlen         = sizeof(int),
 397                 .mode           = 0644,
 398                 .proc_handler   = &proc_dointvec,
 399         },
 400 #endif
 401         {
 402                 .ctl_name       = KERN_PANIC,
 403                 .procname       = "panic",
 404                 .data           = &panic_timeout,
 405                 .maxlen         = sizeof(int),
 406                 .mode           = 0644,
 407                 .proc_handler   = &proc_dointvec,
 408         },
 409         {
 410                 .ctl_name       = KERN_CORE_USES_PID,
 411                 .procname       = "core_uses_pid",
 412                 .data           = &core_uses_pid,
 413                 .maxlen         = sizeof(int),
 414                 .mode           = 0644,
 415                 .proc_handler   = &proc_dointvec,
 416         },
 417         {
 418                 .ctl_name       = KERN_CORE_PATTERN,
 419                 .procname       = "core_pattern",
 420                 .data           = core_pattern,
 421                 .maxlen         = CORENAME_MAX_SIZE,
 422                 .mode           = 0644,
 423                 .proc_handler   = &proc_dostring,
 424                 .strategy       = &sysctl_string,
 425         },
 426 #ifdef CONFIG_PROC_SYSCTL
 427         {
 428                 .procname       = "tainted",
 429                 .maxlen         = sizeof(long),
 430                 .mode           = 0644,
 431                 .proc_handler   = &proc_taint,
 432         },
 433 #endif
 434 #ifdef CONFIG_LATENCYTOP
 435         {
 436                 .procname       = "latencytop",
 437                 .data           = &latencytop_enabled,
 438                 .maxlen         = sizeof(int),
 439                 .mode           = 0644,
 440                 .proc_handler   = &proc_dointvec,
 441         },
 442 #endif
 443 #ifdef CONFIG_BLK_DEV_INITRD
 444         {
 445                 .ctl_name       = KERN_REALROOTDEV,
 446                 .procname       = "real-root-dev",
 447                 .data           = &real_root_dev,
 448                 .maxlen         = sizeof(int),
 449                 .mode           = 0644,
 450                 .proc_handler   = &proc_dointvec,
 451         },
 452 #endif
 453         {
 454                 .ctl_name       = CTL_UNNUMBERED,
 455                 .procname       = "print-fatal-signals",
 456                 .data           = &print_fatal_signals,
 457                 .maxlen         = sizeof(int),
 458                 .mode           = 0644,
 459                 .proc_handler   = &proc_dointvec,
 460         },
 461 #ifdef CONFIG_SPARC
 462         {
 463                 .ctl_name       = KERN_SPARC_REBOOT,
 464                 .procname       = "reboot-cmd",
 465                 .data           = reboot_command,
 466                 .maxlen         = 256,
 467                 .mode           = 0644,
 468                 .proc_handler   = &proc_dostring,
 469                 .strategy       = &sysctl_string,
 470         },
 471         {
 472                 .ctl_name       = KERN_SPARC_STOP_A,
 473                 .procname       = "stop-a",
 474                 .data           = &stop_a_enabled,
 475                 .maxlen         = sizeof (int),
 476                 .mode           = 0644,
 477                 .proc_handler   = &proc_dointvec,
 478         },
 479         {
 480                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 481                 .procname       = "scons-poweroff",
 482                 .data           = &scons_pwroff,
 483                 .maxlen         = sizeof (int),
 484                 .mode           = 0644,
 485                 .proc_handler   = &proc_dointvec,
 486         },
 487 #endif
 488 #ifdef CONFIG_SPARC64
 489         {
 490                 .ctl_name       = CTL_UNNUMBERED,
 491                 .procname       = "tsb-ratio",
 492                 .data           = &sysctl_tsb_ratio,
 493                 .maxlen         = sizeof (int),
 494                 .mode           = 0644,
 495                 .proc_handler   = &proc_dointvec,
 496         },
 497 #endif
 498 #ifdef __hppa__
 499         {
 500                 .ctl_name       = KERN_HPPA_PWRSW,
 501                 .procname       = "soft-power",
 502                 .data           = &pwrsw_enabled,
 503                 .maxlen         = sizeof (int),
 504                 .mode           = 0644,
 505                 .proc_handler   = &proc_dointvec,
 506         },
 507         {
 508                 .ctl_name       = KERN_HPPA_UNALIGNED,
 509                 .procname       = "unaligned-trap",
 510                 .data           = &unaligned_enabled,
 511                 .maxlen         = sizeof (int),
 512                 .mode           = 0644,
 513                 .proc_handler   = &proc_dointvec,
 514         },
 515 #endif
 516         {
 517                 .ctl_name       = KERN_CTLALTDEL,
 518                 .procname       = "ctrl-alt-del",
 519                 .data           = &C_A_D,
 520                 .maxlen         = sizeof(int),
 521                 .mode           = 0644,
 522                 .proc_handler   = &proc_dointvec,
 523         },
 524 #ifdef CONFIG_FUNCTION_TRACER
 525         {
 526                 .ctl_name       = CTL_UNNUMBERED,
 527                 .procname       = "ftrace_enabled",
 528                 .data           = &ftrace_enabled,
 529                 .maxlen         = sizeof(int),
 530                 .mode           = 0644,
 531                 .proc_handler   = &ftrace_enable_sysctl,
 532         },
 533 #endif
 534 #ifdef CONFIG_STACK_TRACER
 535         {
 536                 .ctl_name       = CTL_UNNUMBERED,
 537                 .procname       = "stack_tracer_enabled",
 538                 .data           = &stack_tracer_enabled,
 539                 .maxlen         = sizeof(int),
 540                 .mode           = 0644,
 541                 .proc_handler   = &stack_trace_sysctl,
 542         },
 543 #endif
 544 #ifdef CONFIG_TRACING
 545         {
 546                 .ctl_name       = CTL_UNNUMBERED,
 547                 .procname       = "ftrace_dump_on_oops",
 548                 .data           = &ftrace_dump_on_oops,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = &proc_dointvec,
 552         },
 553 #endif
 554 #ifdef CONFIG_MODULES
 555         {
 556                 .ctl_name       = KERN_MODPROBE,
 557                 .procname       = "modprobe",
 558                 .data           = &modprobe_path,
 559                 .maxlen         = KMOD_PATH_LEN,
 560                 .mode           = 0644,
 561                 .proc_handler   = &proc_dostring,
 562                 .strategy       = &sysctl_string,
 563         },
 564         {
 565                 .ctl_name       = CTL_UNNUMBERED,
 566                 .procname       = "modules_disabled",
 567                 .data           = &modules_disabled,
 568                 .maxlen         = sizeof(int),
 569                 .mode           = 0644,
 570                 /* only handle a transition from default "0" to "1" */
 571                 .proc_handler   = &proc_dointvec_minmax,
 572                 .extra1         = &one,
 573                 .extra2         = &one,
 574         },
 575 #endif
 576 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 577         {
 578                 .ctl_name       = KERN_HOTPLUG,
 579                 .procname       = "hotplug",
 580                 .data           = &uevent_helper,
 581                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 582                 .mode           = 0644,
 583                 .proc_handler   = &proc_dostring,
 584                 .strategy       = &sysctl_string,
 585         },
 586 #endif
 587 #ifdef CONFIG_CHR_DEV_SG
 588         {
 589                 .ctl_name       = KERN_SG_BIG_BUFF,
 590                 .procname       = "sg-big-buff",
 591                 .data           = &sg_big_buff,
 592                 .maxlen         = sizeof (int),
 593                 .mode           = 0444,
 594                 .proc_handler   = &proc_dointvec,
 595         },
 596 #endif
 597 #ifdef CONFIG_BSD_PROCESS_ACCT
 598         {
 599                 .ctl_name       = KERN_ACCT,
 600                 .procname       = "acct",
 601                 .data           = &acct_parm,
 602                 .maxlen         = 3*sizeof(int),
 603                 .mode           = 0644,
 604                 .proc_handler   = &proc_dointvec,
 605         },
 606 #endif
 607 #ifdef CONFIG_MAGIC_SYSRQ
 608         {
 609                 .ctl_name       = KERN_SYSRQ,
 610                 .procname       = "sysrq",
 611                 .data           = &__sysrq_enabled,
 612                 .maxlen         = sizeof (int),
 613                 .mode           = 0644,
 614                 .proc_handler   = &proc_dointvec,
 615         },
 616 #endif
 617 #ifdef CONFIG_PROC_SYSCTL
 618         {
 619                 .procname       = "cad_pid",
 620                 .data           = NULL,
 621                 .maxlen         = sizeof (int),
 622                 .mode           = 0600,
 623                 .proc_handler   = &proc_do_cad_pid,
 624         },
 625 #endif
 626         {
 627                 .ctl_name       = KERN_MAX_THREADS,
 628                 .procname       = "threads-max",
 629                 .data           = &max_threads,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 .proc_handler   = &proc_dointvec,
 633         },
 634         {
 635                 .ctl_name       = KERN_RANDOM,
 636                 .procname       = "random",
 637                 .mode           = 0555,
 638                 .child          = random_table,
 639         },
 640         {
 641                 .ctl_name       = KERN_OVERFLOWUID,
 642                 .procname       = "overflowuid",
 643                 .data           = &overflowuid,
 644                 .maxlen         = sizeof(int),
 645                 .mode           = 0644,
 646                 .proc_handler   = &proc_dointvec_minmax,
 647                 .strategy       = &sysctl_intvec,
 648                 .extra1         = &minolduid,
 649                 .extra2         = &maxolduid,
 650         },
 651         {
 652                 .ctl_name       = KERN_OVERFLOWGID,
 653                 .procname       = "overflowgid",
 654                 .data           = &overflowgid,
 655                 .maxlen         = sizeof(int),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_dointvec_minmax,
 658                 .strategy       = &sysctl_intvec,
 659                 .extra1         = &minolduid,
 660                 .extra2         = &maxolduid,
 661         },
 662 #ifdef CONFIG_S390
 663 #ifdef CONFIG_MATHEMU
 664         {
 665                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 666                 .procname       = "ieee_emulation_warnings",
 667                 .data           = &sysctl_ieee_emulation_warnings,
 668                 .maxlen         = sizeof(int),
 669                 .mode           = 0644,
 670                 .proc_handler   = &proc_dointvec,
 671         },
 672 #endif
 673         {
 674                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 675                 .procname       = "userprocess_debug",
 676                 .data           = &sysctl_userprocess_debug,
 677                 .maxlen         = sizeof(int),
 678                 .mode           = 0644,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681 #endif
 682         {
 683                 .ctl_name       = KERN_PIDMAX,
 684                 .procname       = "pid_max",
 685                 .data           = &pid_max,
 686                 .maxlen         = sizeof (int),
 687                 .mode           = 0644,
 688                 .proc_handler   = &proc_dointvec_minmax,
 689                 .strategy       = sysctl_intvec,
 690                 .extra1         = &pid_max_min,
 691                 .extra2         = &pid_max_max,
 692         },
 693         {
 694                 .ctl_name       = KERN_PANIC_ON_OOPS,
 695                 .procname       = "panic_on_oops",
 696                 .data           = &panic_on_oops,
 697                 .maxlen         = sizeof(int),
 698                 .mode           = 0644,
 699                 .proc_handler   = &proc_dointvec,
 700         },
 701 #if defined CONFIG_PRINTK
 702         {
 703                 .ctl_name       = KERN_PRINTK,
 704                 .procname       = "printk",
 705                 .data           = &console_loglevel,
 706                 .maxlen         = 4*sizeof(int),
 707                 .mode           = 0644,
 708                 .proc_handler   = &proc_dointvec,
 709         },
 710         {
 711                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 712                 .procname       = "printk_ratelimit",
 713                 .data           = &printk_ratelimit_state.interval,
 714                 .maxlen         = sizeof(int),
 715                 .mode           = 0644,
 716                 .proc_handler   = &proc_dointvec_jiffies,
 717                 .strategy       = &sysctl_jiffies,
 718         },
 719         {
 720                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 721                 .procname       = "printk_ratelimit_burst",
 722                 .data           = &printk_ratelimit_state.burst,
 723                 .maxlen         = sizeof(int),
 724                 .mode           = 0644,
 725                 .proc_handler   = &proc_dointvec,
 726         },
 727         {
 728                 .ctl_name       = CTL_UNNUMBERED,
 729                 .procname       = "printk_delay",
 730                 .data           = &printk_delay_msec,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0644,
 733                 .proc_handler   = &proc_dointvec_minmax,
 734                 .strategy       = &sysctl_intvec,
 735                 .extra1         = &zero,
 736                 .extra2         = &ten_thousand,
 737         },
 738 #endif
 739         {
 740                 .ctl_name       = KERN_NGROUPS_MAX,
 741                 .procname       = "ngroups_max",
 742                 .data           = &ngroups_max,
 743                 .maxlen         = sizeof (int),
 744                 .mode           = 0444,
 745                 .proc_handler   = &proc_dointvec,
 746         },
 747 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 748         {
 749                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 750                 .procname       = "unknown_nmi_panic",
 751                 .data           = &unknown_nmi_panic,
 752                 .maxlen         = sizeof (int),
 753                 .mode           = 0644,
 754                 .proc_handler   = &proc_dointvec,
 755         },
 756         {
 757                 .procname       = "nmi_watchdog",
 758                 .data           = &nmi_watchdog_enabled,
 759                 .maxlen         = sizeof (int),
 760                 .mode           = 0644,
 761                 .proc_handler   = &proc_nmi_enabled,
 762         },
 763 #endif
 764 #if defined(CONFIG_X86)
 765         {
 766                 .ctl_name       = KERN_PANIC_ON_NMI,
 767                 .procname       = "panic_on_unrecovered_nmi",
 768                 .data           = &panic_on_unrecovered_nmi,
 769                 .maxlen         = sizeof(int),
 770                 .mode           = 0644,
 771                 .proc_handler   = &proc_dointvec,
 772         },
 773         {
 774                 .ctl_name       = CTL_UNNUMBERED,
 775                 .procname       = "panic_on_io_nmi",
 776                 .data           = &panic_on_io_nmi,
 777                 .maxlen         = sizeof(int),
 778                 .mode           = 0644,
 779                 .proc_handler   = &proc_dointvec,
 780         },
 781         {
 782                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 783                 .procname       = "bootloader_type",
 784                 .data           = &bootloader_type,
 785                 .maxlen         = sizeof (int),
 786                 .mode           = 0444,
 787                 .proc_handler   = &proc_dointvec,
 788         },
 789         {
 790                 .ctl_name       = CTL_UNNUMBERED,
 791                 .procname       = "bootloader_version",
 792                 .data           = &bootloader_version,
 793                 .maxlen         = sizeof (int),
 794                 .mode           = 0444,
 795                 .proc_handler   = &proc_dointvec,
 796         },
 797         {
 798                 .ctl_name       = CTL_UNNUMBERED,
 799                 .procname       = "kstack_depth_to_print",
 800                 .data           = &kstack_depth_to_print,
 801                 .maxlen         = sizeof(int),
 802                 .mode           = 0644,
 803                 .proc_handler   = &proc_dointvec,
 804         },
 805         {
 806                 .ctl_name       = CTL_UNNUMBERED,
 807                 .procname       = "io_delay_type",
 808                 .data           = &io_delay_type,
 809                 .maxlen         = sizeof(int),
 810                 .mode           = 0644,
 811                 .proc_handler   = &proc_dointvec,
 812         },
 813 #endif
 814 #if defined(CONFIG_MMU)
 815         {
 816                 .ctl_name       = KERN_RANDOMIZE,
 817                 .procname       = "randomize_va_space",
 818                 .data           = &randomize_va_space,
 819                 .maxlen         = sizeof(int),
 820                 .mode           = 0644,
 821                 .proc_handler   = &proc_dointvec,
 822         },
 823 #endif
 824 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 825         {
 826                 .ctl_name       = KERN_SPIN_RETRY,
 827                 .procname       = "spin_retry",
 828                 .data           = &spin_retry,
 829                 .maxlen         = sizeof (int),
 830                 .mode           = 0644,
 831                 .proc_handler   = &proc_dointvec,
 832         },
 833 #endif
 834 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 835         {
 836                 .procname       = "acpi_video_flags",
 837                 .data           = &acpi_realmode_flags,
 838                 .maxlen         = sizeof (unsigned long),
 839                 .mode           = 0644,
 840                 .proc_handler   = &proc_doulongvec_minmax,
 841         },
 842 #endif
 843 #ifdef CONFIG_IA64
 844         {
 845                 .ctl_name       = KERN_IA64_UNALIGNED,
 846                 .procname       = "ignore-unaligned-usertrap",
 847                 .data           = &no_unaligned_warning,
 848                 .maxlen         = sizeof (int),
 849                 .mode           = 0644,
 850                 .proc_handler   = &proc_dointvec,
 851         },
 852         {
 853                 .ctl_name       = CTL_UNNUMBERED,
 854                 .procname       = "unaligned-dump-stack",
 855                 .data           = &unaligned_dump_stack,
 856                 .maxlen         = sizeof (int),
 857                 .mode           = 0644,
 858                 .proc_handler   = &proc_dointvec,
 859         },
 860 #endif
 861 #ifdef CONFIG_DETECT_SOFTLOCKUP
 862         {
 863                 .ctl_name       = CTL_UNNUMBERED,
 864                 .procname       = "softlockup_panic",
 865                 .data           = &softlockup_panic,
 866                 .maxlen         = sizeof(int),
 867                 .mode           = 0644,
 868                 .proc_handler   = &proc_dointvec_minmax,
 869                 .strategy       = &sysctl_intvec,
 870                 .extra1         = &zero,
 871                 .extra2         = &one,
 872         },
 873         {
 874                 .ctl_name       = CTL_UNNUMBERED,
 875                 .procname       = "softlockup_thresh",
 876                 .data           = &softlockup_thresh,
 877                 .maxlen         = sizeof(int),
 878                 .mode           = 0644,
 879                 .proc_handler   = &proc_dosoftlockup_thresh,
 880                 .strategy       = &sysctl_intvec,
 881                 .extra1         = &neg_one,
 882                 .extra2         = &sixty,
 883         },
 884 #endif
 885 #ifdef CONFIG_DETECT_HUNG_TASK
 886         {
 887                 .ctl_name       = CTL_UNNUMBERED,
 888                 .procname       = "hung_task_panic",
 889                 .data           = &sysctl_hung_task_panic,
 890                 .maxlen         = sizeof(int),
 891                 .mode           = 0644,
 892                 .proc_handler   = &proc_dointvec_minmax,
 893                 .strategy       = &sysctl_intvec,
 894                 .extra1         = &zero,
 895                 .extra2         = &one,
 896         },
 897         {
 898                 .ctl_name       = CTL_UNNUMBERED,
 899                 .procname       = "hung_task_check_count",
 900                 .data           = &sysctl_hung_task_check_count,
 901                 .maxlen         = sizeof(unsigned long),
 902                 .mode           = 0644,
 903                 .proc_handler   = &proc_doulongvec_minmax,
 904                 .strategy       = &sysctl_intvec,
 905         },
 906         {
 907                 .ctl_name       = CTL_UNNUMBERED,
 908                 .procname       = "hung_task_timeout_secs",
 909                 .data           = &sysctl_hung_task_timeout_secs,
 910                 .maxlen         = sizeof(unsigned long),
 911                 .mode           = 0644,
 912                 .proc_handler   = &proc_dohung_task_timeout_secs,
 913                 .strategy       = &sysctl_intvec,
 914         },
 915         {
 916                 .ctl_name       = CTL_UNNUMBERED,
 917                 .procname       = "hung_task_warnings",
 918                 .data           = &sysctl_hung_task_warnings,
 919                 .maxlen         = sizeof(unsigned long),
 920                 .mode           = 0644,
 921                 .proc_handler   = &proc_doulongvec_minmax,
 922                 .strategy       = &sysctl_intvec,
 923         },
 924 #endif
 925 #ifdef CONFIG_COMPAT
 926         {
 927                 .ctl_name       = KERN_COMPAT_LOG,
 928                 .procname       = "compat-log",
 929                 .data           = &compat_log,
 930                 .maxlen         = sizeof (int),
 931                 .mode           = 0644,
 932                 .proc_handler   = &proc_dointvec,
 933         },
 934 #endif
 935 #ifdef CONFIG_RT_MUTEXES
 936         {
 937                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 938                 .procname       = "max_lock_depth",
 939                 .data           = &max_lock_depth,
 940                 .maxlen         = sizeof(int),
 941                 .mode           = 0644,
 942                 .proc_handler   = &proc_dointvec,
 943         },
 944 #endif
 945         {
 946                 .ctl_name       = CTL_UNNUMBERED,
 947                 .procname       = "poweroff_cmd",
 948                 .data           = &poweroff_cmd,
 949                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 950                 .mode           = 0644,
 951                 .proc_handler   = &proc_dostring,
 952                 .strategy       = &sysctl_string,
 953         },
 954 #ifdef CONFIG_KEYS
 955         {
 956                 .ctl_name       = CTL_UNNUMBERED,
 957                 .procname       = "keys",
 958                 .mode           = 0555,
 959                 .child          = key_sysctls,
 960         },
 961 #endif
 962 #ifdef CONFIG_RCU_TORTURE_TEST
 963         {
 964                 .ctl_name       = CTL_UNNUMBERED,
 965                 .procname       = "rcutorture_runnable",
 966                 .data           = &rcutorture_runnable,
 967                 .maxlen         = sizeof(int),
 968                 .mode           = 0644,
 969                 .proc_handler   = &proc_dointvec,
 970         },
 971 #endif
 972 #ifdef CONFIG_SLOW_WORK
 973         {
 974                 .ctl_name       = CTL_UNNUMBERED,
 975                 .procname       = "slow-work",
 976                 .mode           = 0555,
 977                 .child          = slow_work_sysctls,
 978         },
 979 #endif
 980 #ifdef CONFIG_PERF_EVENTS
 981         {
 982                 .ctl_name       = CTL_UNNUMBERED,
 983                 .procname       = "perf_event_paranoid",
 984                 .data           = &sysctl_perf_event_paranoid,
 985                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
 986                 .mode           = 0644,
 987                 .proc_handler   = &proc_dointvec,
 988         },
 989         {
 990                 .ctl_name       = CTL_UNNUMBERED,
 991                 .procname       = "perf_event_mlock_kb",
 992                 .data           = &sysctl_perf_event_mlock,
 993                 .maxlen         = sizeof(sysctl_perf_event_mlock),
 994                 .mode           = 0644,
 995                 .proc_handler   = &proc_dointvec,
 996         },
 997         {
 998                 .ctl_name       = CTL_UNNUMBERED,
 999                 .procname       = "perf_event_max_sample_rate",
1000                 .data           = &sysctl_perf_event_sample_rate,
1001                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1002                 .mode           = 0644,
1003                 .proc_handler   = &proc_dointvec,
1004         },
1005 #endif
1006 #ifdef CONFIG_KMEMCHECK
1007         {
1008                 .ctl_name       = CTL_UNNUMBERED,
1009                 .procname       = "kmemcheck",
1010                 .data           = &kmemcheck_enabled,
1011                 .maxlen         = sizeof(int),
1012                 .mode           = 0644,
1013                 .proc_handler   = &proc_dointvec,
1014         },
1015 #endif
1016 #ifdef CONFIG_BLOCK
1017         {
1018                 .ctl_name       = CTL_UNNUMBERED,
1019                 .procname       = "blk_iopoll",
1020                 .data           = &blk_iopoll_enabled,
1021                 .maxlen         = sizeof(int),
1022                 .mode           = 0644,
1023                 .proc_handler   = &proc_dointvec,
1024         },
1025 #endif
1026 /*
1027  * NOTE: do not add new entries to this table unless you have read
1028  * Documentation/sysctl/ctl_unnumbered.txt
1029  */
1030         { .ctl_name = 0 }
1031 };
1032
1033 static struct ctl_table vm_table[] = {
1034         {
1035                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
1036                 .procname       = "overcommit_memory",
1037                 .data           = &sysctl_overcommit_memory,
1038                 .maxlen         = sizeof(sysctl_overcommit_memory),
1039                 .mode           = 0644,
1040                 .proc_handler   = &proc_dointvec,
1041         },
1042         {
1043                 .ctl_name       = VM_PANIC_ON_OOM,
1044                 .procname       = "panic_on_oom",
1045                 .data           = &sysctl_panic_on_oom,
1046                 .maxlen         = sizeof(sysctl_panic_on_oom),
1047                 .mode           = 0644,
1048                 .proc_handler   = &proc_dointvec,
1049         },
1050         {
1051                 .ctl_name       = CTL_UNNUMBERED,
1052                 .procname       = "oom_kill_allocating_task",
1053                 .data           = &sysctl_oom_kill_allocating_task,
1054                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1055                 .mode           = 0644,
1056                 .proc_handler   = &proc_dointvec,
1057         },
1058         {
1059                 .ctl_name       = CTL_UNNUMBERED,
1060                 .procname       = "oom_dump_tasks",
1061                 .data           = &sysctl_oom_dump_tasks,
1062                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1063                 .mode           = 0644,
1064                 .proc_handler   = &proc_dointvec,
1065         },
1066         {
1067                 .ctl_name       = VM_OVERCOMMIT_RATIO,
1068                 .procname       = "overcommit_ratio",
1069                 .data           = &sysctl_overcommit_ratio,
1070                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1071                 .mode           = 0644,
1072                 .proc_handler   = &proc_dointvec,
1073         },
1074         {
1075                 .ctl_name       = VM_PAGE_CLUSTER,
1076                 .procname       = "page-cluster",
1077                 .data           = &page_cluster,
1078                 .maxlen         = sizeof(int),
1079                 .mode           = 0644,
1080                 .proc_handler   = &proc_dointvec,
1081         },
1082         {
1083                 .ctl_name       = VM_DIRTY_BACKGROUND,
1084                 .procname       = "dirty_background_ratio",
1085                 .data           = &dirty_background_ratio,
1086                 .maxlen         = sizeof(dirty_background_ratio),
1087                 .mode           = 0644,
1088                 .proc_handler   = &dirty_background_ratio_handler,
1089                 .strategy       = &sysctl_intvec,
1090                 .extra1         = &zero,
1091                 .extra2         = &one_hundred,
1092         },
1093         {
1094                 .ctl_name       = CTL_UNNUMBERED,
1095                 .procname       = "dirty_background_bytes",
1096                 .data           = &dirty_background_bytes,
1097                 .maxlen         = sizeof(dirty_background_bytes),
1098                 .mode           = 0644,
1099                 .proc_handler   = &dirty_background_bytes_handler,
1100                 .strategy       = &sysctl_intvec,
1101                 .extra1         = &one_ul,
1102         },
1103         {
1104                 .ctl_name       = VM_DIRTY_RATIO,
1105                 .procname       = "dirty_ratio",
1106                 .data           = &vm_dirty_ratio,
1107                 .maxlen         = sizeof(vm_dirty_ratio),
1108                 .mode           = 0644,
1109                 .proc_handler   = &dirty_ratio_handler,
1110                 .strategy       = &sysctl_intvec,
1111                 .extra1         = &zero,
1112                 .extra2         = &one_hundred,
1113         },
1114         {
1115                 .ctl_name       = CTL_UNNUMBERED,
1116                 .procname       = "dirty_bytes",
1117                 .data           = &vm_dirty_bytes,
1118                 .maxlen         = sizeof(vm_dirty_bytes),
1119                 .mode           = 0644,
1120                 .proc_handler   = &dirty_bytes_handler,
1121                 .strategy       = &sysctl_intvec,
1122                 .extra1         = &dirty_bytes_min,
1123         },
1124         {
1125                 .procname       = "dirty_writeback_centisecs",
1126                 .data           = &dirty_writeback_interval,
1127                 .maxlen         = sizeof(dirty_writeback_interval),
1128                 .mode           = 0644,
1129                 .proc_handler   = &dirty_writeback_centisecs_handler,
1130         },
1131         {
1132                 .procname       = "dirty_expire_centisecs",
1133                 .data           = &dirty_expire_interval,
1134                 .maxlen         = sizeof(dirty_expire_interval),
1135                 .mode           = 0644,
1136                 .proc_handler   = &proc_dointvec,
1137         },
1138         {
1139                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
1140                 .procname       = "nr_pdflush_threads",
1141                 .data           = &nr_pdflush_threads,
1142                 .maxlen         = sizeof nr_pdflush_threads,
1143                 .mode           = 0444 /* read-only*/,
1144                 .proc_handler   = &proc_dointvec,
1145         },
1146         {
1147                 .ctl_name       = VM_SWAPPINESS,
1148                 .procname       = "swappiness",
1149                 .data           = &vm_swappiness,
1150                 .maxlen         = sizeof(vm_swappiness),
1151                 .mode           = 0644,
1152                 .proc_handler   = &proc_dointvec_minmax,
1153                 .strategy       = &sysctl_intvec,
1154                 .extra1         = &zero,
1155                 .extra2         = &one_hundred,
1156         },
1157 #ifdef CONFIG_HUGETLB_PAGE
1158          {
1159                 .procname       = "nr_hugepages",
1160                 .data           = NULL,
1161                 .maxlen         = sizeof(unsigned long),
1162                 .mode           = 0644,
1163                 .proc_handler   = &hugetlb_sysctl_handler,
1164                 .extra1         = (void *)&hugetlb_zero,
1165                 .extra2         = (void *)&hugetlb_infinity,
1166          },
1167          {
1168                 .ctl_name       = VM_HUGETLB_GROUP,
1169                 .procname       = "hugetlb_shm_group",
1170                 .data           = &sysctl_hugetlb_shm_group,
1171                 .maxlen         = sizeof(gid_t),
1172                 .mode           = 0644,
1173                 .proc_handler   = &proc_dointvec,
1174          },
1175          {
1176                 .ctl_name       = CTL_UNNUMBERED,
1177                 .procname       = "hugepages_treat_as_movable",
1178                 .data           = &hugepages_treat_as_movable,
1179                 .maxlen         = sizeof(int),
1180                 .mode           = 0644,
1181                 .proc_handler   = &hugetlb_treat_movable_handler,
1182         },
1183         {
1184                 .ctl_name       = CTL_UNNUMBERED,
1185                 .procname       = "nr_overcommit_hugepages",
1186                 .data           = NULL,
1187                 .maxlen         = sizeof(unsigned long),
1188                 .mode           = 0644,
1189                 .proc_handler   = &hugetlb_overcommit_handler,
1190                 .extra1         = (void *)&hugetlb_zero,
1191                 .extra2         = (void *)&hugetlb_infinity,
1192         },
1193 #endif
1194         {
1195                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
1196                 .procname       = "lowmem_reserve_ratio",
1197                 .data           = &sysctl_lowmem_reserve_ratio,
1198                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1199                 .mode           = 0644,
1200                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1201                 .strategy       = &sysctl_intvec,
1202         },
1203         {
1204                 .ctl_name       = VM_DROP_PAGECACHE,
1205                 .procname       = "drop_caches",
1206                 .data           = &sysctl_drop_caches,
1207                 .maxlen         = sizeof(int),
1208                 .mode           = 0644,
1209                 .proc_handler   = drop_caches_sysctl_handler,
1210                 .strategy       = &sysctl_intvec,
1211         },
1212         {
1213                 .ctl_name       = VM_MIN_FREE_KBYTES,
1214                 .procname       = "min_free_kbytes",
1215                 .data           = &min_free_kbytes,
1216                 .maxlen         = sizeof(min_free_kbytes),
1217                 .mode           = 0644,
1218                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1219                 .strategy       = &sysctl_intvec,
1220                 .extra1         = &zero,
1221         },
1222         {
1223                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1224                 .procname       = "percpu_pagelist_fraction",
1225                 .data           = &percpu_pagelist_fraction,
1226                 .maxlen         = sizeof(percpu_pagelist_fraction),
1227                 .mode           = 0644,
1228                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1229                 .strategy       = &sysctl_intvec,
1230                 .extra1         = &min_percpu_pagelist_fract,
1231         },
1232 #ifdef CONFIG_MMU
1233         {
1234                 .ctl_name       = VM_MAX_MAP_COUNT,
1235                 .procname       = "max_map_count",
1236                 .data           = &sysctl_max_map_count,
1237                 .maxlen         = sizeof(sysctl_max_map_count),
1238                 .mode           = 0644,
1239                 .proc_handler   = &proc_dointvec
1240         },
1241 #else
1242         {
1243                 .ctl_name       = CTL_UNNUMBERED,
1244                 .procname       = "nr_trim_pages",
1245                 .data           = &sysctl_nr_trim_pages,
1246                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1247                 .mode           = 0644,
1248                 .proc_handler   = &proc_dointvec_minmax,
1249                 .strategy       = &sysctl_intvec,
1250                 .extra1         = &zero,
1251         },
1252 #endif
1253         {
1254                 .ctl_name       = VM_LAPTOP_MODE,
1255                 .procname       = "laptop_mode",
1256                 .data           = &laptop_mode,
1257                 .maxlen         = sizeof(laptop_mode),
1258                 .mode           = 0644,
1259                 .proc_handler   = &proc_dointvec_jiffies,
1260                 .strategy       = &sysctl_jiffies,
1261         },
1262         {
1263                 .ctl_name       = VM_BLOCK_DUMP,
1264                 .procname       = "block_dump",
1265                 .data           = &block_dump,
1266                 .maxlen         = sizeof(block_dump),
1267                 .mode           = 0644,
1268                 .proc_handler   = &proc_dointvec,
1269                 .strategy       = &sysctl_intvec,
1270                 .extra1         = &zero,
1271         },
1272         {
1273                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1274                 .procname       = "vfs_cache_pressure",
1275                 .data           = &sysctl_vfs_cache_pressure,
1276                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1277                 .mode           = 0644,
1278                 .proc_handler   = &proc_dointvec,
1279                 .strategy       = &sysctl_intvec,
1280                 .extra1         = &zero,
1281         },
1282 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1283         {
1284                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1285                 .procname       = "legacy_va_layout",
1286                 .data           = &sysctl_legacy_va_layout,
1287                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1288                 .mode           = 0644,
1289                 .proc_handler   = &proc_dointvec,
1290                 .strategy       = &sysctl_intvec,
1291                 .extra1         = &zero,
1292         },
1293 #endif
1294 #ifdef CONFIG_NUMA
1295         {
1296                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1297                 .procname       = "zone_reclaim_mode",
1298                 .data           = &zone_reclaim_mode,
1299                 .maxlen         = sizeof(zone_reclaim_mode),
1300                 .mode           = 0644,
1301                 .proc_handler   = &proc_dointvec,
1302                 .strategy       = &sysctl_intvec,
1303                 .extra1         = &zero,
1304         },
1305         {
1306                 .ctl_name       = VM_MIN_UNMAPPED,
1307                 .procname       = "min_unmapped_ratio",
1308                 .data           = &sysctl_min_unmapped_ratio,
1309                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1310                 .mode           = 0644,
1311                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1312                 .strategy       = &sysctl_intvec,
1313                 .extra1         = &zero,
1314                 .extra2         = &one_hundred,
1315         },
1316         {
1317                 .ctl_name       = VM_MIN_SLAB,
1318                 .procname       = "min_slab_ratio",
1319                 .data           = &sysctl_min_slab_ratio,
1320                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1321                 .mode           = 0644,
1322                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1323                 .strategy       = &sysctl_intvec,
1324                 .extra1         = &zero,
1325                 .extra2         = &one_hundred,
1326         },
1327 #endif
1328 #ifdef CONFIG_SMP
1329         {
1330                 .ctl_name       = CTL_UNNUMBERED,
1331                 .procname       = "stat_interval",
1332                 .data           = &sysctl_stat_interval,
1333                 .maxlen         = sizeof(sysctl_stat_interval),
1334                 .mode           = 0644,
1335                 .proc_handler   = &proc_dointvec_jiffies,
1336                 .strategy       = &sysctl_jiffies,
1337         },
1338 #endif
1339         {
1340                 .ctl_name       = CTL_UNNUMBERED,
1341                 .procname       = "mmap_min_addr",
1342                 .data           = &dac_mmap_min_addr,
1343                 .maxlen         = sizeof(unsigned long),
1344                 .mode           = 0644,
1345                 .proc_handler   = &mmap_min_addr_handler,
1346         },
1347 #ifdef CONFIG_NUMA
1348         {
1349                 .ctl_name       = CTL_UNNUMBERED,
1350                 .procname       = "numa_zonelist_order",
1351                 .data           = &numa_zonelist_order,
1352                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1353                 .mode           = 0644,
1354                 .proc_handler   = &numa_zonelist_order_handler,
1355                 .strategy       = &sysctl_string,
1356         },
1357 #endif
1358 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1359    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1360         {
1361                 .ctl_name       = VM_VDSO_ENABLED,
1362                 .procname       = "vdso_enabled",
1363                 .data           = &vdso_enabled,
1364                 .maxlen         = sizeof(vdso_enabled),
1365                 .mode           = 0644,
1366                 .proc_handler   = &proc_dointvec,
1367                 .strategy       = &sysctl_intvec,
1368                 .extra1         = &zero,
1369         },
1370 #endif
1371 #ifdef CONFIG_HIGHMEM
1372         {
1373                 .ctl_name       = CTL_UNNUMBERED,
1374                 .procname       = "highmem_is_dirtyable",
1375                 .data           = &vm_highmem_is_dirtyable,
1376                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1377                 .mode           = 0644,
1378                 .proc_handler   = &proc_dointvec_minmax,
1379                 .strategy       = &sysctl_intvec,
1380                 .extra1         = &zero,
1381                 .extra2         = &one,
1382         },
1383 #endif
1384         {
1385                 .ctl_name       = CTL_UNNUMBERED,
1386                 .procname       = "scan_unevictable_pages",
1387                 .data           = &scan_unevictable_pages,
1388                 .maxlen         = sizeof(scan_unevictable_pages),
1389                 .mode           = 0644,
1390                 .proc_handler   = &scan_unevictable_handler,
1391         },
1392 /*
1393  * NOTE: do not add new entries to this table unless you have read
1394  * Documentation/sysctl/ctl_unnumbered.txt
1395  */
1396         { .ctl_name = 0 }
1397 };
1398
1399 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1400 static struct ctl_table binfmt_misc_table[] = {
1401         { .ctl_name = 0 }
1402 };
1403 #endif
1404
1405 static struct ctl_table fs_table[] = {
1406         {
1407                 .ctl_name       = FS_NRINODE,
1408                 .procname       = "inode-nr",
1409                 .data           = &inodes_stat,
1410                 .maxlen         = 2*sizeof(int),
1411                 .mode           = 0444,
1412                 .proc_handler   = &proc_dointvec,
1413         },
1414         {
1415                 .ctl_name       = FS_STATINODE,
1416                 .procname       = "inode-state",
1417                 .data           = &inodes_stat,
1418                 .maxlen         = 7*sizeof(int),
1419                 .mode           = 0444,
1420                 .proc_handler   = &proc_dointvec,
1421         },
1422         {
1423                 .procname       = "file-nr",
1424                 .data           = &files_stat,
1425                 .maxlen         = 3*sizeof(int),
1426                 .mode           = 0444,
1427                 .proc_handler   = &proc_nr_files,
1428         },
1429         {
1430                 .ctl_name       = FS_MAXFILE,
1431                 .procname       = "file-max",
1432                 .data           = &files_stat.max_files,
1433                 .maxlen         = sizeof(int),
1434                 .mode           = 0644,
1435                 .proc_handler   = &proc_dointvec,
1436         },
1437         {
1438                 .ctl_name       = CTL_UNNUMBERED,
1439                 .procname       = "nr_open",
1440                 .data           = &sysctl_nr_open,
1441                 .maxlen         = sizeof(int),
1442                 .mode           = 0644,
1443                 .proc_handler   = &proc_dointvec_minmax,
1444                 .extra1         = &sysctl_nr_open_min,
1445                 .extra2         = &sysctl_nr_open_max,
1446         },
1447         {
1448                 .ctl_name       = FS_DENTRY,
1449                 .procname       = "dentry-state",
1450                 .data           = &dentry_stat,
1451                 .maxlen         = 6*sizeof(int),
1452                 .mode           = 0444,
1453                 .proc_handler   = &proc_dointvec,
1454         },
1455         {
1456                 .ctl_name       = FS_OVERFLOWUID,
1457                 .procname       = "overflowuid",
1458                 .data           = &fs_overflowuid,
1459                 .maxlen         = sizeof(int),
1460                 .mode           = 0644,
1461                 .proc_handler   = &proc_dointvec_minmax,
1462                 .strategy       = &sysctl_intvec,
1463                 .extra1         = &minolduid,
1464                 .extra2         = &maxolduid,
1465         },
1466         {
1467                 .ctl_name       = FS_OVERFLOWGID,
1468                 .procname       = "overflowgid",
1469                 .data           = &fs_overflowgid,
1470                 .maxlen         = sizeof(int),
1471                 .mode           = 0644,
1472                 .proc_handler   = &proc_dointvec_minmax,
1473                 .strategy       = &sysctl_intvec,
1474                 .extra1         = &minolduid,
1475                 .extra2         = &maxolduid,
1476         },
1477 #ifdef CONFIG_FILE_LOCKING
1478         {
1479                 .ctl_name       = FS_LEASES,
1480                 .procname       = "leases-enable",
1481                 .data           = &leases_enable,
1482                 .maxlen         = sizeof(int),
1483                 .mode           = 0644,
1484                 .proc_handler   = &proc_dointvec,
1485         },
1486 #endif
1487 #ifdef CONFIG_DNOTIFY
1488         {
1489                 .ctl_name       = FS_DIR_NOTIFY,
1490                 .procname       = "dir-notify-enable",
1491                 .data           = &dir_notify_enable,
1492                 .maxlen         = sizeof(int),
1493                 .mode           = 0644,
1494                 .proc_handler   = &proc_dointvec,
1495         },
1496 #endif
1497 #ifdef CONFIG_MMU
1498 #ifdef CONFIG_FILE_LOCKING
1499         {
1500                 .ctl_name       = FS_LEASE_TIME,
1501                 .procname       = "lease-break-time",
1502                 .data           = &lease_break_time,
1503                 .maxlen         = sizeof(int),
1504                 .mode           = 0644,
1505                 .proc_handler   = &proc_dointvec,
1506         },
1507 #endif
1508 #ifdef CONFIG_AIO
1509         {
1510                 .procname       = "aio-nr",
1511                 .data           = &aio_nr,
1512                 .maxlen         = sizeof(aio_nr),
1513                 .mode           = 0444,
1514                 .proc_handler   = &proc_doulongvec_minmax,
1515         },
1516         {
1517                 .procname       = "aio-max-nr",
1518                 .data           = &aio_max_nr,
1519                 .maxlen         = sizeof(aio_max_nr),
1520                 .mode           = 0644,
1521                 .proc_handler   = &proc_doulongvec_minmax,
1522         },
1523 #endif /* CONFIG_AIO */
1524 #ifdef CONFIG_INOTIFY_USER
1525         {
1526                 .ctl_name       = FS_INOTIFY,
1527                 .procname       = "inotify",
1528                 .mode           = 0555,
1529                 .child          = inotify_table,
1530         },
1531 #endif
1532 #ifdef CONFIG_EPOLL
1533         {
1534                 .procname       = "epoll",
1535                 .mode           = 0555,
1536                 .child          = epoll_table,
1537         },
1538 #endif
1539 #endif
1540         {
1541                 .ctl_name       = KERN_SETUID_DUMPABLE,
1542                 .procname       = "suid_dumpable",
1543                 .data           = &suid_dumpable,
1544                 .maxlen         = sizeof(int),
1545                 .mode           = 0644,
1546                 .proc_handler   = &proc_dointvec_minmax,
1547                 .strategy       = &sysctl_intvec,
1548                 .extra1         = &zero,
1549                 .extra2         = &two,
1550         },
1551 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1552         {
1553                 .ctl_name       = CTL_UNNUMBERED,
1554                 .procname       = "binfmt_misc",
1555                 .mode           = 0555,
1556                 .child          = binfmt_misc_table,
1557         },
1558 #endif
1559 /*
1560  * NOTE: do not add new entries to this table unless you have read
1561  * Documentation/sysctl/ctl_unnumbered.txt
1562  */
1563         { .ctl_name = 0 }
1564 };
1565
1566 static struct ctl_table debug_table[] = {
1567 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1568         {
1569                 .ctl_name       = CTL_UNNUMBERED,
1570                 .procname       = "exception-trace",
1571                 .data           = &show_unhandled_signals,
1572                 .maxlen         = sizeof(int),
1573                 .mode           = 0644,
1574                 .proc_handler   = proc_dointvec
1575         },
1576 #endif
1577         { .ctl_name = 0 }
1578 };
1579
1580 static struct ctl_table dev_table[] = {
1581         { .ctl_name = 0 }
1582 };
1583
1584 static DEFINE_SPINLOCK(sysctl_lock);
1585
1586 /* called under sysctl_lock */
1587 static int use_table(struct ctl_table_header *p)
1588 {
1589         if (unlikely(p->unregistering))
1590                 return 0;
1591         p->used++;
1592         return 1;
1593 }
1594
1595 /* called under sysctl_lock */
1596 static void unuse_table(struct ctl_table_header *p)
1597 {
1598         if (!--p->used)
1599                 if (unlikely(p->unregistering))
1600                         complete(p->unregistering);
1601 }
1602
1603 /* called under sysctl_lock, will reacquire if has to wait */
1604 static void start_unregistering(struct ctl_table_header *p)
1605 {
1606         /*
1607          * if p->used is 0, nobody will ever touch that entry again;
1608          * we'll eliminate all paths to it before dropping sysctl_lock
1609          */
1610         if (unlikely(p->used)) {
1611                 struct completion wait;
1612                 init_completion(&wait);
1613                 p->unregistering = &wait;
1614                 spin_unlock(&sysctl_lock);
1615                 wait_for_completion(&wait);
1616                 spin_lock(&sysctl_lock);
1617         } else {
1618                 /* anything non-NULL; we'll never dereference it */
1619                 p->unregistering = ERR_PTR(-EINVAL);
1620         }
1621         /*
1622          * do not remove from the list until nobody holds it; walking the
1623          * list in do_sysctl() relies on that.
1624          */
1625         list_del_init(&p->ctl_entry);
1626 }
1627
1628 void sysctl_head_get(struct ctl_table_header *head)
1629 {
1630         spin_lock(&sysctl_lock);
1631         head->count++;
1632         spin_unlock(&sysctl_lock);
1633 }
1634
1635 void sysctl_head_put(struct ctl_table_header *head)
1636 {
1637         spin_lock(&sysctl_lock);
1638         if (!--head->count)
1639                 kfree(head);
1640         spin_unlock(&sysctl_lock);
1641 }
1642
1643 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1644 {
1645         if (!head)
1646                 BUG();
1647         spin_lock(&sysctl_lock);
1648         if (!use_table(head))
1649                 head = ERR_PTR(-ENOENT);
1650         spin_unlock(&sysctl_lock);
1651         return head;
1652 }
1653
1654 void sysctl_head_finish(struct ctl_table_header *head)
1655 {
1656         if (!head)
1657                 return;
1658         spin_lock(&sysctl_lock);
1659         unuse_table(head);
1660         spin_unlock(&sysctl_lock);
1661 }
1662
1663 static struct ctl_table_set *
1664 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1665 {
1666         struct ctl_table_set *set = &root->default_set;
1667         if (root->lookup)
1668                 set = root->lookup(root, namespaces);
1669         return set;
1670 }
1671
1672 static struct list_head *
1673 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1674 {
1675         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1676         return &set->list;
1677 }
1678
1679 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1680                                             struct ctl_table_header *prev)
1681 {
1682         struct ctl_table_root *root;
1683         struct list_head *header_list;
1684         struct ctl_table_header *head;
1685         struct list_head *tmp;
1686
1687         spin_lock(&sysctl_lock);
1688         if (prev) {
1689                 head = prev;
1690                 tmp = &prev->ctl_entry;
1691                 unuse_table(prev);
1692                 goto next;
1693         }
1694         tmp = &root_table_header.ctl_entry;
1695         for (;;) {
1696                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1697
1698                 if (!use_table(head))
1699                         goto next;
1700                 spin_unlock(&sysctl_lock);
1701                 return head;
1702         next:
1703                 root = head->root;
1704                 tmp = tmp->next;
1705                 header_list = lookup_header_list(root, namespaces);
1706                 if (tmp != header_list)
1707                         continue;
1708
1709                 do {
1710                         root = list_entry(root->root_list.next,
1711                                         struct ctl_table_root, root_list);
1712                         if (root == &sysctl_table_root)
1713                                 goto out;
1714                         header_list = lookup_header_list(root, namespaces);
1715                 } while (list_empty(header_list));
1716                 tmp = header_list->next;
1717         }
1718 out:
1719         spin_unlock(&sysctl_lock);
1720         return NULL;
1721 }
1722
1723 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1724 {
1725         return __sysctl_head_next(current->nsproxy, prev);
1726 }
1727
1728 void register_sysctl_root(struct ctl_table_root *root)
1729 {
1730         spin_lock(&sysctl_lock);
1731         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1732         spin_unlock(&sysctl_lock);
1733 }
1734
1735 #ifdef CONFIG_SYSCTL_SYSCALL
1736 /* Perform the actual read/write of a sysctl table entry. */
1737 static int do_sysctl_strategy(struct ctl_table_root *root,
1738                         struct ctl_table *table,
1739                         void __user *oldval, size_t __user *oldlenp,
1740                         void __user *newval, size_t newlen)
1741 {
1742         int op = 0, rc;
1743
1744         if (oldval)
1745                 op |= MAY_READ;
1746         if (newval)
1747                 op |= MAY_WRITE;
1748         if (sysctl_perm(root, table, op))
1749                 return -EPERM;
1750
1751         if (table->strategy) {
1752                 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1753                 if (rc < 0)
1754                         return rc;
1755                 if (rc > 0)
1756                         return 0;
1757         }
1758
1759         /* If there is no strategy routine, or if the strategy returns
1760          * zero, proceed with automatic r/w */
1761         if (table->data && table->maxlen) {
1762                 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1763                 if (rc < 0)
1764                         return rc;
1765         }
1766         return 0;
1767 }
1768
1769 static int parse_table(int __user *name, int nlen,
1770                        void __user *oldval, size_t __user *oldlenp,
1771                        void __user *newval, size_t newlen,
1772                        struct ctl_table_root *root,
1773                        struct ctl_table *table)
1774 {
1775         int n;
1776 repeat:
1777         if (!nlen)
1778                 return -ENOTDIR;
1779         if (get_user(n, name))
1780                 return -EFAULT;
1781         for ( ; table->ctl_name || table->procname; table++) {
1782                 if (!table->ctl_name)
1783                         continue;
1784                 if (n == table->ctl_name) {
1785                         int error;
1786                         if (table->child) {
1787                                 if (sysctl_perm(root, table, MAY_EXEC))
1788                                         return -EPERM;
1789                                 name++;
1790                                 nlen--;
1791                                 table = table->child;
1792                                 goto repeat;
1793                         }
1794                         error = do_sysctl_strategy(root, table,
1795                                                    oldval, oldlenp,
1796                                                    newval, newlen);
1797                         return error;
1798                 }
1799         }
1800         return -ENOTDIR;
1801 }
1802
1803 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1804                void __user *newval, size_t newlen)
1805 {
1806         struct ctl_table_header *head;
1807         int error = -ENOTDIR;
1808
1809         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1810                 return -ENOTDIR;
1811         if (oldval) {
1812                 int old_len;
1813                 if (!oldlenp || get_user(old_len, oldlenp))
1814                         return -EFAULT;
1815         }
1816
1817         for (head = sysctl_head_next(NULL); head;
1818                         head = sysctl_head_next(head)) {
1819                 error = parse_table(name, nlen, oldval, oldlenp,
1820                                         newval, newlen,
1821                                         head->root, head->ctl_table);
1822                 if (error != -ENOTDIR) {
1823                         sysctl_head_finish(head);
1824                         break;
1825                 }
1826         }
1827         return error;
1828 }
1829
1830 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1831 {
1832         struct __sysctl_args tmp;
1833         int error;
1834
1835         if (copy_from_user(&tmp, args, sizeof(tmp)))
1836                 return -EFAULT;
1837
1838         error = deprecated_sysctl_warning(&tmp);
1839         if (error)
1840                 goto out;
1841
1842         lock_kernel();
1843         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1844                           tmp.newval, tmp.newlen);
1845         unlock_kernel();
1846 out:
1847         return error;
1848 }
1849 #endif /* CONFIG_SYSCTL_SYSCALL */
1850
1851 /*
1852  * sysctl_perm does NOT grant the superuser all rights automatically, because
1853  * some sysctl variables are readonly even to root.
1854  */
1855
1856 static int test_perm(int mode, int op)
1857 {
1858         if (!current_euid())
1859                 mode >>= 6;
1860         else if (in_egroup_p(0))
1861                 mode >>= 3;
1862         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1863                 return 0;
1864         return -EACCES;
1865 }
1866
1867 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1868 {
1869         int error;
1870         int mode;
1871
1872         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1873         if (error)
1874                 return error;
1875
1876         if (root->permissions)
1877                 mode = root->permissions(root, current->nsproxy, table);
1878         else
1879                 mode = table->mode;
1880
1881         return test_perm(mode, op);
1882 }
1883
1884 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1885 {
1886         for (; table->ctl_name || table->procname; table++) {
1887                 table->parent = parent;
1888                 if (table->child)
1889                         sysctl_set_parent(table, table->child);
1890         }
1891 }
1892
1893 static __init int sysctl_init(void)
1894 {
1895         sysctl_set_parent(NULL, root_table);
1896 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1897         {
1898                 int err;
1899                 err = sysctl_check_table(current->nsproxy, root_table);
1900         }
1901 #endif
1902         return 0;
1903 }
1904
1905 core_initcall(sysctl_init);
1906
1907 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1908                                       struct ctl_table *table)
1909 {
1910         struct ctl_table *p;
1911         const char *s = branch->procname;
1912
1913         /* branch should have named subdirectory as its first element */
1914         if (!s || !branch->child)
1915                 return NULL;
1916
1917         /* ... and nothing else */
1918         if (branch[1].procname || branch[1].ctl_name)
1919                 return NULL;
1920
1921         /* table should contain subdirectory with the same name */
1922         for (p = table; p->procname || p->ctl_name; p++) {
1923                 if (!p->child)
1924                         continue;
1925                 if (p->procname && strcmp(p->procname, s) == 0)
1926                         return p;
1927         }
1928         return NULL;
1929 }
1930
1931 /* see if attaching q to p would be an improvement */
1932 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1933 {
1934         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1935         struct ctl_table *next;
1936         int is_better = 0;
1937         int not_in_parent = !p->attached_by;
1938
1939         while ((next = is_branch_in(by, to)) != NULL) {
1940                 if (by == q->attached_by)
1941                         is_better = 1;
1942                 if (to == p->attached_by)
1943                         not_in_parent = 1;
1944                 by = by->child;
1945                 to = next->child;
1946         }
1947
1948         if (is_better && not_in_parent) {
1949                 q->attached_by = by;
1950                 q->attached_to = to;
1951                 q->parent = p;
1952         }
1953 }
1954
1955 /**
1956  * __register_sysctl_paths - register a sysctl hierarchy
1957  * @root: List of sysctl headers to register on
1958  * @namespaces: Data to compute which lists of sysctl entries are visible
1959  * @path: The path to the directory the sysctl table is in.
1960  * @table: the top-level table structure
1961  *
1962  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1963  * array. A completely 0 filled entry terminates the table.
1964  *
1965  * The members of the &struct ctl_table structure are used as follows:
1966  *
1967  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1968  *            must be unique within that level of sysctl
1969  *
1970  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1971  *            enter a sysctl file
1972  *
1973  * data - a pointer to data for use by proc_handler
1974  *
1975  * maxlen - the maximum size in bytes of the data
1976  *
1977  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1978  *
1979  * child - a pointer to the child sysctl table if this entry is a directory, or
1980  *         %NULL.
1981  *
1982  * proc_handler - the text handler routine (described below)
1983  *
1984  * strategy - the strategy routine (described below)
1985  *
1986  * de - for internal use by the sysctl routines
1987  *
1988  * extra1, extra2 - extra pointers usable by the proc handler routines
1989  *
1990  * Leaf nodes in the sysctl tree will be represented by a single file
1991  * under /proc; non-leaf nodes will be represented by directories.
1992  *
1993  * sysctl(2) can automatically manage read and write requests through
1994  * the sysctl table.  The data and maxlen fields of the ctl_table
1995  * struct enable minimal validation of the values being written to be
1996  * performed, and the mode field allows minimal authentication.
1997  *
1998  * More sophisticated management can be enabled by the provision of a
1999  * strategy routine with the table entry.  This will be called before
2000  * any automatic read or write of the data is performed.
2001  *
2002  * The strategy routine may return
2003  *
2004  * < 0 - Error occurred (error is passed to user process)
2005  *
2006  * 0   - OK - proceed with automatic read or write.
2007  *
2008  * > 0 - OK - read or write has been done by the strategy routine, so
2009  *       return immediately.
2010  *
2011  * There must be a proc_handler routine for any terminal nodes
2012  * mirrored under /proc/sys (non-terminals are handled by a built-in
2013  * directory handler).  Several default handlers are available to
2014  * cover common cases -
2015  *
2016  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
2017  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
2018  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
2019  *
2020  * It is the handler's job to read the input buffer from user memory
2021  * and process it. The handler should return 0 on success.
2022  *
2023  * This routine returns %NULL on a failure to register, and a pointer
2024  * to the table header on success.
2025  */
2026 struct ctl_table_header *__register_sysctl_paths(
2027         struct ctl_table_root *root,
2028         struct nsproxy *namespaces,
2029         const struct ctl_path *path, struct ctl_table *table)
2030 {
2031         struct ctl_table_header *header;
2032         struct ctl_table *new, **prevp;
2033         unsigned int n, npath;
2034         struct ctl_table_set *set;
2035
2036         /* Count the path components */
2037         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
2038                 ;
2039
2040         /*
2041          * For each path component, allocate a 2-element ctl_table array.
2042          * The first array element will be filled with the sysctl entry
2043          * for this, the second will be the sentinel (ctl_name == 0).
2044          *
2045          * We allocate everything in one go so that we don't have to
2046          * worry about freeing additional memory in unregister_sysctl_table.
2047          */
2048         header = kzalloc(sizeof(struct ctl_table_header) +
2049                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2050         if (!header)
2051                 return NULL;
2052
2053         new = (struct ctl_table *) (header + 1);
2054
2055         /* Now connect the dots */
2056         prevp = &header->ctl_table;
2057         for (n = 0; n < npath; ++n, ++path) {
2058                 /* Copy the procname */
2059                 new->procname = path->procname;
2060                 new->ctl_name = path->ctl_name;
2061                 new->mode     = 0555;
2062
2063                 *prevp = new;
2064                 prevp = &new->child;
2065
2066                 new += 2;
2067         }
2068         *prevp = table;
2069         header->ctl_table_arg = table;
2070
2071         INIT_LIST_HEAD(&header->ctl_entry);
2072         header->used = 0;
2073         header->unregistering = NULL;
2074         header->root = root;
2075         sysctl_set_parent(NULL, header->ctl_table);
2076         header->count = 1;
2077 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2078         if (sysctl_check_table(namespaces, header->ctl_table)) {
2079                 kfree(header);
2080                 return NULL;
2081         }
2082 #endif
2083         spin_lock(&sysctl_lock);
2084         header->set = lookup_header_set(root, namespaces);
2085         header->attached_by = header->ctl_table;
2086         header->attached_to = root_table;
2087         header->parent = &root_table_header;
2088         for (set = header->set; set; set = set->parent) {
2089                 struct ctl_table_header *p;
2090                 list_for_each_entry(p, &set->list, ctl_entry) {
2091                         if (p->unregistering)
2092                                 continue;
2093                         try_attach(p, header);
2094                 }
2095         }
2096         header->parent->count++;
2097         list_add_tail(&header->ctl_entry, &header->set->list);
2098         spin_unlock(&sysctl_lock);
2099
2100         return header;
2101 }
2102
2103 /**
2104  * register_sysctl_table_path - register a sysctl table hierarchy
2105  * @path: The path to the directory the sysctl table is in.
2106  * @table: the top-level table structure
2107  *
2108  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2109  * array. A completely 0 filled entry terminates the table.
2110  *
2111  * See __register_sysctl_paths for more details.
2112  */
2113 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2114                                                 struct ctl_table *table)
2115 {
2116         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2117                                         path, table);
2118 }
2119
2120 /**
2121  * register_sysctl_table - register a sysctl table hierarchy
2122  * @table: the top-level table structure
2123  *
2124  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2125  * array. A completely 0 filled entry terminates the table.
2126  *
2127  * See register_sysctl_paths for more details.
2128  */
2129 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2130 {
2131         static const struct ctl_path null_path[] = { {} };
2132
2133         return register_sysctl_paths(null_path, table);
2134 }
2135
2136 /**
2137  * unregister_sysctl_table - unregister a sysctl table hierarchy
2138  * @header: the header returned from register_sysctl_table
2139  *
2140  * Unregisters the sysctl table and all children. proc entries may not
2141  * actually be removed until they are no longer used by anyone.
2142  */
2143 void unregister_sysctl_table(struct ctl_table_header * header)
2144 {
2145         might_sleep();
2146
2147         if (header == NULL)
2148                 return;
2149
2150         spin_lock(&sysctl_lock);
2151         start_unregistering(header);
2152         if (!--header->parent->count) {
2153                 WARN_ON(1);
2154                 kfree(header->parent);
2155         }
2156         if (!--header->count)
2157                 kfree(header);
2158         spin_unlock(&sysctl_lock);
2159 }
2160
2161 int sysctl_is_seen(struct ctl_table_header *p)
2162 {
2163         struct ctl_table_set *set = p->set;
2164         int res;
2165         spin_lock(&sysctl_lock);
2166         if (p->unregistering)
2167                 res = 0;
2168         else if (!set->is_seen)
2169                 res = 1;
2170         else
2171                 res = set->is_seen(set);
2172         spin_unlock(&sysctl_lock);
2173         return res;
2174 }
2175
2176 void setup_sysctl_set(struct ctl_table_set *p,
2177         struct ctl_table_set *parent,
2178         int (*is_seen)(struct ctl_table_set *))
2179 {
2180         INIT_LIST_HEAD(&p->list);
2181         p->parent = parent ? parent : &sysctl_table_root.default_set;
2182         p->is_seen = is_seen;
2183 }
2184
2185 #else /* !CONFIG_SYSCTL */
2186 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2187 {
2188         return NULL;
2189 }
2190
2191 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2192                                                     struct ctl_table *table)
2193 {
2194         return NULL;
2195 }
2196
2197 void unregister_sysctl_table(struct ctl_table_header * table)
2198 {
2199 }
2200
2201 void setup_sysctl_set(struct ctl_table_set *p,
2202         struct ctl_table_set *parent,
2203         int (*is_seen)(struct ctl_table_set *))
2204 {
2205 }
2206
2207 void sysctl_head_put(struct ctl_table_header *head)
2208 {
2209 }
2210
2211 #endif /* CONFIG_SYSCTL */
2212
2213 /*
2214  * /proc/sys support
2215  */
2216
2217 #ifdef CONFIG_PROC_SYSCTL
2218
2219 static int _proc_do_string(void* data, int maxlen, int write,
2220                            struct file *filp, void __user *buffer,
2221                            size_t *lenp, loff_t *ppos)
2222 {
2223         size_t len;
2224         char __user *p;
2225         char c;
2226
2227         if (!data || !maxlen || !*lenp) {
2228                 *lenp = 0;
2229                 return 0;
2230         }
2231
2232         if (write) {
2233                 len = 0;
2234                 p = buffer;
2235                 while (len < *lenp) {
2236                         if (get_user(c, p++))
2237                                 return -EFAULT;
2238                         if (c == 0 || c == '\n')
2239                                 break;
2240                         len++;
2241                 }
2242                 if (len >= maxlen)
2243                         len = maxlen-1;
2244                 if(copy_from_user(data, buffer, len))
2245                         return -EFAULT;
2246                 ((char *) data)[len] = 0;
2247                 *ppos += *lenp;
2248         } else {
2249                 len = strlen(data);
2250                 if (len > maxlen)
2251                         len = maxlen;
2252
2253                 if (*ppos > len) {
2254                         *lenp = 0;
2255                         return 0;
2256                 }
2257
2258                 data += *ppos;
2259                 len  -= *ppos;
2260
2261                 if (len > *lenp)
2262                         len = *lenp;
2263                 if (len)
2264                         if(copy_to_user(buffer, data, len))
2265                                 return -EFAULT;
2266                 if (len < *lenp) {
2267                         if(put_user('\n', ((char __user *) buffer) + len))
2268                                 return -EFAULT;
2269                         len++;
2270                 }
2271                 *lenp = len;
2272                 *ppos += len;
2273         }
2274         return 0;
2275 }
2276
2277 /**
2278  * proc_dostring - read a string sysctl
2279  * @table: the sysctl table
2280  * @write: %TRUE if this is a write to the sysctl file
2281  * @filp: the file structure
2282  * @buffer: the user buffer
2283  * @lenp: the size of the user buffer
2284  * @ppos: file position
2285  *
2286  * Reads/writes a string from/to the user buffer. If the kernel
2287  * buffer provided is not large enough to hold the string, the
2288  * string is truncated. The copied string is %NULL-terminated.
2289  * If the string is being read by the user process, it is copied
2290  * and a newline '\n' is added. It is truncated if the buffer is
2291  * not large enough.
2292  *
2293  * Returns 0 on success.
2294  */
2295 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2296                   void __user *buffer, size_t *lenp, loff_t *ppos)
2297 {
2298         return _proc_do_string(table->data, table->maxlen, write, filp,
2299                                buffer, lenp, ppos);
2300 }
2301
2302
2303 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2304                                  int *valp,
2305                                  int write, void *data)
2306 {
2307         if (write) {
2308                 *valp = *negp ? -*lvalp : *lvalp;
2309         } else {
2310                 int val = *valp;
2311                 if (val < 0) {
2312                         *negp = -1;
2313                         *lvalp = (unsigned long)-val;
2314                 } else {
2315                         *negp = 0;
2316                         *lvalp = (unsigned long)val;
2317                 }
2318         }
2319         return 0;
2320 }
2321
2322 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2323                   int write, struct file *filp, void __user *buffer,
2324                   size_t *lenp, loff_t *ppos,
2325                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2326                               int write, void *data),
2327                   void *data)
2328 {
2329 #define TMPBUFLEN 21
2330         int *i, vleft, first = 1, neg;
2331         unsigned long lval;
2332         size_t left, len;
2333
2334         char buf[TMPBUFLEN], *p;
2335         char __user *s = buffer;
2336
2337         if (!tbl_data || !table->maxlen || !*lenp ||
2338             (*ppos && !write)) {
2339                 *lenp = 0;
2340                 return 0;
2341         }
2342
2343         i = (int *) tbl_data;
2344         vleft = table->maxlen / sizeof(*i);
2345         left = *lenp;
2346
2347         if (!conv)
2348                 conv = do_proc_dointvec_conv;
2349
2350         for (; left && vleft--; i++, first=0) {
2351                 if (write) {
2352                         while (left) {
2353                                 char c;
2354                                 if (get_user(c, s))
2355                                         return -EFAULT;
2356                                 if (!isspace(c))
2357                                         break;
2358                                 left--;
2359                                 s++;
2360                         }
2361                         if (!left)
2362                                 break;
2363                         neg = 0;
2364                         len = left;
2365                         if (len > sizeof(buf) - 1)
2366                                 len = sizeof(buf) - 1;
2367                         if (copy_from_user(buf, s, len))
2368                                 return -EFAULT;
2369                         buf[len] = 0;
2370                         p = buf;
2371                         if (*p == '-' && left > 1) {
2372                                 neg = 1;
2373                                 p++;
2374                         }
2375                         if (*p < '0' || *p > '9')
2376                                 break;
2377
2378                         lval = simple_strtoul(p, &p, 0);
2379
2380                         len = p-buf;
2381                         if ((len < left) && *p && !isspace(*p))
2382                                 break;
2383                         s += len;
2384                         left -= len;
2385
2386                         if (conv(&neg, &lval, i, 1, data))
2387                                 break;
2388                 } else {
2389                         p = buf;
2390                         if (!first)
2391                                 *p++ = '\t';
2392
2393                         if (conv(&neg, &lval, i, 0, data))
2394                                 break;
2395
2396                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2397                         len = strlen(buf);
2398                         if (len > left)
2399                                 len = left;
2400                         if(copy_to_user(s, buf, len))
2401                                 return -EFAULT;
2402                         left -= len;
2403                         s += len;
2404                 }
2405         }
2406
2407         if (!write && !first && left) {
2408                 if(put_user('\n', s))
2409                         return -EFAULT;
2410                 left--, s++;
2411         }
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                 }
2421         }
2422         if (write && first)
2423                 return -EINVAL;
2424         *lenp -= left;
2425         *ppos += *lenp;
2426         return 0;
2427 #undef TMPBUFLEN
2428 }
2429
2430 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2431                   void __user *buffer, size_t *lenp, loff_t *ppos,
2432                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2433                               int write, void *data),
2434                   void *data)
2435 {
2436         return __do_proc_dointvec(table->data, table, write, filp,
2437                         buffer, lenp, ppos, conv, data);
2438 }
2439
2440 /**
2441  * proc_dointvec - read a vector of integers
2442  * @table: the sysctl table
2443  * @write: %TRUE if this is a write to the sysctl file
2444  * @filp: the file structure
2445  * @buffer: the user buffer
2446  * @lenp: the size of the user buffer
2447  * @ppos: file position
2448  *
2449  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2450  * values from/to the user buffer, treated as an ASCII string.
2451  *
2452  * Returns 0 on success.
2453  */
2454 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2455                      void __user *buffer, size_t *lenp, loff_t *ppos)
2456 {
2457     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2458                             NULL,NULL);
2459 }
2460
2461 /*
2462  * Taint values can only be increased
2463  * This means we can safely use a temporary.
2464  */
2465 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2466                                void __user *buffer, size_t *lenp, loff_t *ppos)
2467 {
2468         struct ctl_table t;
2469         unsigned long tmptaint = get_taint();
2470         int err;
2471
2472         if (write && !capable(CAP_SYS_ADMIN))
2473                 return -EPERM;
2474
2475         t = *table;
2476         t.data = &tmptaint;
2477         err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2478         if (err < 0)
2479                 return err;
2480
2481         if (write) {
2482                 /*
2483                  * Poor man's atomic or. Not worth adding a primitive
2484                  * to everyone's atomic.h for this
2485                  */
2486                 int i;
2487                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2488                         if ((tmptaint >> i) & 1)
2489                                 add_taint(i);
2490                 }
2491         }
2492
2493         return err;
2494 }
2495
2496 struct do_proc_dointvec_minmax_conv_param {
2497         int *min;
2498         int *max;
2499 };
2500
2501 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2502                                         int *valp,
2503                                         int write, void *data)
2504 {
2505         struct do_proc_dointvec_minmax_conv_param *param = data;
2506         if (write) {
2507                 int val = *negp ? -*lvalp : *lvalp;
2508                 if ((param->min && *param->min > val) ||
2509                     (param->max && *param->max < val))
2510                         return -EINVAL;
2511                 *valp = val;
2512         } else {
2513                 int val = *valp;
2514                 if (val < 0) {
2515                         *negp = -1;
2516                         *lvalp = (unsigned long)-val;
2517                 } else {
2518                         *negp = 0;
2519                         *lvalp = (unsigned long)val;
2520                 }
2521         }
2522         return 0;
2523 }
2524
2525 /**
2526  * proc_dointvec_minmax - read a vector of integers with min/max values
2527  * @table: the sysctl table
2528  * @write: %TRUE if this is a write to the sysctl file
2529  * @filp: the file structure
2530  * @buffer: the user buffer
2531  * @lenp: the size of the user buffer
2532  * @ppos: file position
2533  *
2534  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2535  * values from/to the user buffer, treated as an ASCII string.
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_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2543                   void __user *buffer, size_t *lenp, loff_t *ppos)
2544 {
2545         struct do_proc_dointvec_minmax_conv_param param = {
2546                 .min = (int *) table->extra1,
2547                 .max = (int *) table->extra2,
2548         };
2549         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2550                                 do_proc_dointvec_minmax_conv, &param);
2551 }
2552
2553 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2554                                      struct file *filp,
2555                                      void __user *buffer,
2556                                      size_t *lenp, loff_t *ppos,
2557                                      unsigned long convmul,
2558                                      unsigned long convdiv)
2559 {
2560 #define TMPBUFLEN 21
2561         unsigned long *i, *min, *max, val;
2562         int vleft, first=1, neg;
2563         size_t len, left;
2564         char buf[TMPBUFLEN], *p;
2565         char __user *s = buffer;
2566
2567         if (!data || !table->maxlen || !*lenp ||
2568             (*ppos && !write)) {
2569                 *lenp = 0;
2570                 return 0;
2571         }
2572
2573         i = (unsigned long *) data;
2574         min = (unsigned long *) table->extra1;
2575         max = (unsigned long *) table->extra2;
2576         vleft = table->maxlen / sizeof(unsigned long);
2577         left = *lenp;
2578
2579         for (; left && vleft--; i++, min++, max++, first=0) {
2580                 if (write) {
2581                         while (left) {
2582                                 char c;
2583                                 if (get_user(c, s))
2584                                         return -EFAULT;
2585                                 if (!isspace(c))
2586                                         break;
2587                                 left--;
2588                                 s++;
2589                         }
2590                         if (!left)
2591                                 break;
2592                         neg = 0;
2593                         len = left;
2594                         if (len > TMPBUFLEN-1)
2595                                 len = TMPBUFLEN-1;
2596                         if (copy_from_user(buf, s, len))
2597                                 return -EFAULT;
2598                         buf[len] = 0;
2599                         p = buf;
2600                         if (*p == '-' && left > 1) {
2601                                 neg = 1;
2602                                 p++;
2603                         }
2604                         if (*p < '0' || *p > '9')
2605                                 break;
2606                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2607                         len = p-buf;
2608                         if ((len < left) && *p && !isspace(*p))
2609                                 break;
2610                         if (neg)
2611                                 val = -val;
2612                         s += len;
2613                         left -= len;
2614
2615                         if(neg)
2616                                 continue;
2617                         if ((min && val < *min) || (max && val > *max))
2618                                 continue;
2619                         *i = val;
2620                 } else {
2621                         p = buf;
2622                         if (!first)
2623                                 *p++ = '\t';
2624                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2625                         len = strlen(buf);
2626                         if (len > left)
2627                                 len = left;
2628                         if(copy_to_user(s, buf, len))
2629                                 return -EFAULT;
2630                         left -= len;
2631                         s += len;
2632                 }
2633         }
2634
2635         if (!write && !first && left) {
2636                 if(put_user('\n', s))
2637                         return -EFAULT;
2638                 left--, s++;
2639         }
2640         if (write) {
2641                 while (left) {
2642                         char c;
2643                         if (get_user(c, s++))
2644                                 return -EFAULT;
2645                         if (!isspace(c))
2646                                 break;
2647                         left--;
2648                 }
2649         }
2650         if (write && first)
2651                 return -EINVAL;
2652         *lenp -= left;
2653         *ppos += *lenp;
2654         return 0;
2655 #undef TMPBUFLEN
2656 }
2657
2658 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2659                                      struct file *filp,
2660                                      void __user *buffer,
2661                                      size_t *lenp, loff_t *ppos,
2662                                      unsigned long convmul,
2663                                      unsigned long convdiv)
2664 {
2665         return __do_proc_doulongvec_minmax(table->data, table, write,
2666                         filp, buffer, lenp, ppos, convmul, convdiv);
2667 }
2668
2669 /**
2670  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2671  * @table: the sysctl table
2672  * @write: %TRUE if this is a write to the sysctl file
2673  * @filp: the file structure
2674  * @buffer: the user buffer
2675  * @lenp: the size of the user buffer
2676  * @ppos: file position
2677  *
2678  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2679  * values from/to the user buffer, treated as an ASCII string.
2680  *
2681  * This routine will ensure the values are within the range specified by
2682  * table->extra1 (min) and table->extra2 (max).
2683  *
2684  * Returns 0 on success.
2685  */
2686 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2687                            void __user *buffer, size_t *lenp, loff_t *ppos)
2688 {
2689     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2690 }
2691
2692 /**
2693  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2694  * @table: the sysctl table
2695  * @write: %TRUE if this is a write to the sysctl file
2696  * @filp: the file structure
2697  * @buffer: the user buffer
2698  * @lenp: the size of the user buffer
2699  * @ppos: file position
2700  *
2701  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2702  * values from/to the user buffer, treated as an ASCII string. The values
2703  * are treated as milliseconds, and converted to jiffies when they are stored.
2704  *
2705  * This routine will ensure the values are within the range specified by
2706  * table->extra1 (min) and table->extra2 (max).
2707  *
2708  * Returns 0 on success.
2709  */
2710 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2711                                       struct file *filp,
2712                                       void __user *buffer,
2713                                       size_t *lenp, loff_t *ppos)
2714 {
2715     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2716                                      lenp, ppos, HZ, 1000l);
2717 }
2718
2719
2720 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2721                                          int *valp,
2722                                          int write, void *data)
2723 {
2724         if (write) {
2725                 if (*lvalp > LONG_MAX / HZ)
2726                         return 1;
2727                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2728         } else {
2729                 int val = *valp;
2730                 unsigned long lval;
2731                 if (val < 0) {
2732                         *negp = -1;
2733                         lval = (unsigned long)-val;
2734                 } else {
2735                         *negp = 0;
2736                         lval = (unsigned long)val;
2737                 }
2738                 *lvalp = lval / HZ;
2739         }
2740         return 0;
2741 }
2742
2743 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2744                                                 int *valp,
2745                                                 int write, void *data)
2746 {
2747         if (write) {
2748                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2749                         return 1;
2750                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2751         } else {
2752                 int val = *valp;
2753                 unsigned long lval;
2754                 if (val < 0) {
2755                         *negp = -1;
2756                         lval = (unsigned long)-val;
2757                 } else {
2758                         *negp = 0;
2759                         lval = (unsigned long)val;
2760                 }
2761                 *lvalp = jiffies_to_clock_t(lval);
2762         }
2763         return 0;
2764 }
2765
2766 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2767                                             int *valp,
2768                                             int write, void *data)
2769 {
2770         if (write) {
2771                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2772         } else {
2773                 int val = *valp;
2774                 unsigned long lval;
2775                 if (val < 0) {
2776                         *negp = -1;
2777                         lval = (unsigned long)-val;
2778                 } else {
2779                         *negp = 0;
2780                         lval = (unsigned long)val;
2781                 }
2782                 *lvalp = jiffies_to_msecs(lval);
2783         }
2784         return 0;
2785 }
2786
2787 /**
2788  * proc_dointvec_jiffies - read a vector of integers as seconds
2789  * @table: the sysctl table
2790  * @write: %TRUE if this is a write to the sysctl file
2791  * @filp: the file structure
2792  * @buffer: the user buffer
2793  * @lenp: the size of the user buffer
2794  * @ppos: file position
2795  *
2796  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2797  * values from/to the user buffer, treated as an ASCII string.
2798  * The values read are assumed to be in seconds, and are converted into
2799  * jiffies.
2800  *
2801  * Returns 0 on success.
2802  */
2803 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2804                           void __user *buffer, size_t *lenp, loff_t *ppos)
2805 {
2806     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2807                             do_proc_dointvec_jiffies_conv,NULL);
2808 }
2809
2810 /**
2811  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2812  * @table: the sysctl table
2813  * @write: %TRUE if this is a write to the sysctl file
2814  * @filp: the file structure
2815  * @buffer: the user buffer
2816  * @lenp: the size of the user buffer
2817  * @ppos: pointer to the file position
2818  *
2819  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2820  * values from/to the user buffer, treated as an ASCII string.
2821  * The values read are assumed to be in 1/USER_HZ seconds, and
2822  * are converted into jiffies.
2823  *
2824  * Returns 0 on success.
2825  */
2826 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2827                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2828 {
2829     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2830                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2831 }
2832
2833 /**
2834  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2835  * @table: the sysctl table
2836  * @write: %TRUE if this is a write to the sysctl file
2837  * @filp: the file structure
2838  * @buffer: the user buffer
2839  * @lenp: the size of the user buffer
2840  * @ppos: file position
2841  * @ppos: the current position in the file
2842  *
2843  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2844  * values from/to the user buffer, treated as an ASCII string.
2845  * The values read are assumed to be in 1/1000 seconds, and
2846  * are converted into jiffies.
2847  *
2848  * Returns 0 on success.
2849  */
2850 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2851                              void __user *buffer, size_t *lenp, loff_t *ppos)
2852 {
2853         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2854                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2855 }
2856
2857 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2858                            void __user *buffer, size_t *lenp, loff_t *ppos)
2859 {
2860         struct pid *new_pid;
2861         pid_t tmp;
2862         int r;
2863
2864         tmp = pid_vnr(cad_pid);
2865
2866         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2867                                lenp, ppos, NULL, NULL);
2868         if (r || !write)
2869                 return r;
2870
2871         new_pid = find_get_pid(tmp);
2872         if (!new_pid)
2873                 return -ESRCH;
2874
2875         put_pid(xchg(&cad_pid, new_pid));
2876         return 0;
2877 }
2878
2879 #else /* CONFIG_PROC_FS */
2880
2881 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2882                   void __user *buffer, size_t *lenp, loff_t *ppos)
2883 {
2884         return -ENOSYS;
2885 }
2886
2887 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2888                   void __user *buffer, size_t *lenp, loff_t *ppos)
2889 {
2890         return -ENOSYS;
2891 }
2892
2893 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2894                     void __user *buffer, size_t *lenp, loff_t *ppos)
2895 {
2896         return -ENOSYS;
2897 }
2898
2899 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2900                     void __user *buffer, size_t *lenp, loff_t *ppos)
2901 {
2902         return -ENOSYS;
2903 }
2904
2905 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2906                     void __user *buffer, size_t *lenp, loff_t *ppos)
2907 {
2908         return -ENOSYS;
2909 }
2910
2911 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2912                              void __user *buffer, size_t *lenp, loff_t *ppos)
2913 {
2914         return -ENOSYS;
2915 }
2916
2917 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2918                     void __user *buffer, size_t *lenp, loff_t *ppos)
2919 {
2920         return -ENOSYS;
2921 }
2922
2923 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2924                                       struct file *filp,
2925                                       void __user *buffer,
2926                                       size_t *lenp, loff_t *ppos)
2927 {
2928     return -ENOSYS;
2929 }
2930
2931
2932 #endif /* CONFIG_PROC_FS */
2933
2934
2935 #ifdef CONFIG_SYSCTL_SYSCALL
2936 /*
2937  * General sysctl support routines
2938  */
2939
2940 /* The generic sysctl data routine (used if no strategy routine supplied) */
2941 int sysctl_data(struct ctl_table *table,
2942                 void __user *oldval, size_t __user *oldlenp,
2943                 void __user *newval, size_t newlen)
2944 {
2945         size_t len;
2946
2947         /* Get out of I don't have a variable */
2948         if (!table->data || !table->maxlen)
2949                 return -ENOTDIR;
2950
2951         if (oldval && oldlenp) {
2952                 if (get_user(len, oldlenp))
2953                         return -EFAULT;
2954                 if (len) {
2955                         if (len > table->maxlen)
2956                                 len = table->maxlen;
2957                         if (copy_to_user(oldval, table->data, len))
2958                                 return -EFAULT;
2959                         if (put_user(len, oldlenp))
2960                                 return -EFAULT;
2961                 }
2962         }
2963
2964         if (newval && newlen) {
2965                 if (newlen > table->maxlen)
2966                         newlen = table->maxlen;
2967
2968                 if (copy_from_user(table->data, newval, newlen))
2969                         return -EFAULT;
2970         }
2971         return 1;
2972 }
2973
2974 /* The generic string strategy routine: */
2975 int sysctl_string(struct ctl_table *table,
2976                   void __user *oldval, size_t __user *oldlenp,
2977                   void __user *newval, size_t newlen)
2978 {
2979         if (!table->data || !table->maxlen)
2980                 return -ENOTDIR;
2981
2982         if (oldval && oldlenp) {
2983                 size_t bufsize;
2984                 if (get_user(bufsize, oldlenp))
2985                         return -EFAULT;
2986                 if (bufsize) {
2987                         size_t len = strlen(table->data), copied;
2988
2989                         /* This shouldn't trigger for a well-formed sysctl */
2990                         if (len > table->maxlen)
2991                                 len = table->maxlen;
2992
2993                         /* Copy up to a max of bufsize-1 bytes of the string */
2994                         copied = (len >= bufsize) ? bufsize - 1 : len;
2995
2996                         if (copy_to_user(oldval, table->data, copied) ||
2997                             put_user(0, (char __user *)(oldval + copied)))
2998                                 return -EFAULT;
2999                         if (put_user(len, oldlenp))
3000                                 return -EFAULT;
3001                 }
3002         }
3003         if (newval && newlen) {
3004                 size_t len = newlen;
3005                 if (len > table->maxlen)
3006                         len = table->maxlen;
3007                 if(copy_from_user(table->data, newval, len))
3008                         return -EFAULT;
3009                 if (len == table->maxlen)
3010                         len--;
3011                 ((char *) table->data)[len] = 0;
3012         }
3013         return 1;
3014 }
3015
3016 /*
3017  * This function makes sure that all of the integers in the vector
3018  * are between the minimum and maximum values given in the arrays
3019  * table->extra1 and table->extra2, respectively.
3020  */
3021 int sysctl_intvec(struct ctl_table *table,
3022                 void __user *oldval, size_t __user *oldlenp,
3023                 void __user *newval, size_t newlen)
3024 {
3025
3026         if (newval && newlen) {
3027                 int __user *vec = (int __user *) newval;
3028                 int *min = (int *) table->extra1;
3029                 int *max = (int *) table->extra2;
3030                 size_t length;
3031                 int i;
3032
3033                 if (newlen % sizeof(int) != 0)
3034                         return -EINVAL;
3035
3036                 if (!table->extra1 && !table->extra2)
3037                         return 0;
3038
3039                 if (newlen > table->maxlen)
3040                         newlen = table->maxlen;
3041                 length = newlen / sizeof(int);
3042
3043                 for (i = 0; i < length; i++) {
3044                         int value;
3045                         if (get_user(value, vec + i))
3046                                 return -EFAULT;
3047                         if (min && value < min[i])
3048                                 return -EINVAL;
3049                         if (max && value > max[i])
3050                                 return -EINVAL;
3051                 }
3052         }
3053         return 0;
3054 }
3055
3056 /* Strategy function to convert jiffies to seconds */
3057 int sysctl_jiffies(struct ctl_table *table,
3058                 void __user *oldval, size_t __user *oldlenp,
3059                 void __user *newval, size_t newlen)
3060 {
3061         if (oldval && oldlenp) {
3062                 size_t olen;
3063
3064                 if (get_user(olen, oldlenp))
3065                         return -EFAULT;
3066                 if (olen) {
3067                         int val;
3068
3069                         if (olen < sizeof(int))
3070                                 return -EINVAL;
3071
3072                         val = *(int *)(table->data) / HZ;
3073                         if (put_user(val, (int __user *)oldval))
3074                                 return -EFAULT;
3075                         if (put_user(sizeof(int), oldlenp))
3076                                 return -EFAULT;
3077                 }
3078         }
3079         if (newval && newlen) {
3080                 int new;
3081                 if (newlen != sizeof(int))
3082                         return -EINVAL;
3083                 if (get_user(new, (int __user *)newval))
3084                         return -EFAULT;
3085                 *(int *)(table->data) = new*HZ;
3086         }
3087         return 1;
3088 }
3089
3090 /* Strategy function to convert jiffies to seconds */
3091 int sysctl_ms_jiffies(struct ctl_table *table,
3092                 void __user *oldval, size_t __user *oldlenp,
3093                 void __user *newval, size_t newlen)
3094 {
3095         if (oldval && oldlenp) {
3096                 size_t olen;
3097
3098                 if (get_user(olen, oldlenp))
3099                         return -EFAULT;
3100                 if (olen) {
3101                         int val;
3102
3103                         if (olen < sizeof(int))
3104                                 return -EINVAL;
3105
3106                         val = jiffies_to_msecs(*(int *)(table->data));
3107                         if (put_user(val, (int __user *)oldval))
3108                                 return -EFAULT;
3109                         if (put_user(sizeof(int), oldlenp))
3110                                 return -EFAULT;
3111                 }
3112         }
3113         if (newval && newlen) {
3114                 int new;
3115                 if (newlen != sizeof(int))
3116                         return -EINVAL;
3117                 if (get_user(new, (int __user *)newval))
3118                         return -EFAULT;
3119                 *(int *)(table->data) = msecs_to_jiffies(new);
3120         }
3121         return 1;
3122 }
3123
3124
3125
3126 #else /* CONFIG_SYSCTL_SYSCALL */
3127
3128
3129 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
3130 {
3131         struct __sysctl_args tmp;
3132         int error;
3133
3134         if (copy_from_user(&tmp, args, sizeof(tmp)))
3135                 return -EFAULT;
3136
3137         error = deprecated_sysctl_warning(&tmp);
3138
3139         /* If no error reading the parameters then just -ENOSYS ... */
3140         if (!error)
3141                 error = -ENOSYS;
3142
3143         return error;
3144 }
3145
3146 int sysctl_data(struct ctl_table *table,
3147                   void __user *oldval, size_t __user *oldlenp,
3148                   void __user *newval, size_t newlen)
3149 {
3150         return -ENOSYS;
3151 }
3152
3153 int sysctl_string(struct ctl_table *table,
3154                   void __user *oldval, size_t __user *oldlenp,
3155                   void __user *newval, size_t newlen)
3156 {
3157         return -ENOSYS;
3158 }
3159
3160 int sysctl_intvec(struct ctl_table *table,
3161                 void __user *oldval, size_t __user *oldlenp,
3162                 void __user *newval, size_t newlen)
3163 {
3164         return -ENOSYS;
3165 }
3166
3167 int sysctl_jiffies(struct ctl_table *table,
3168                 void __user *oldval, size_t __user *oldlenp,
3169                 void __user *newval, size_t newlen)
3170 {
3171         return -ENOSYS;
3172 }
3173
3174 int sysctl_ms_jiffies(struct ctl_table *table,
3175                 void __user *oldval, size_t __user *oldlenp,
3176                 void __user *newval, size_t newlen)
3177 {
3178         return -ENOSYS;
3179 }
3180
3181 #endif /* CONFIG_SYSCTL_SYSCALL */
3182
3183 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3184 {
3185         static int msg_count;
3186         int name[CTL_MAXNAME];
3187         int i;
3188
3189         /* Check args->nlen. */
3190         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3191                 return -ENOTDIR;
3192
3193         /* Read in the sysctl name for better debug message logging */
3194         for (i = 0; i < args->nlen; i++)
3195                 if (get_user(name[i], args->name + i))
3196                         return -EFAULT;
3197
3198         /* Ignore accesses to kernel.version */
3199         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3200                 return 0;
3201
3202         if (msg_count < 5) {
3203                 msg_count++;
3204                 printk(KERN_INFO
3205                         "warning: process `%s' used the deprecated sysctl "
3206                         "system call with ", current->comm);
3207                 for (i = 0; i < args->nlen; i++)
3208                         printk("%d.", name[i]);
3209                 printk("\n");
3210         }
3211         return 0;
3212 }
3213
3214 /*
3215  * No sense putting this after each symbol definition, twice,
3216  * exception granted :-)
3217  */
3218 EXPORT_SYMBOL(proc_dointvec);
3219 EXPORT_SYMBOL(proc_dointvec_jiffies);
3220 EXPORT_SYMBOL(proc_dointvec_minmax);
3221 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3222 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3223 EXPORT_SYMBOL(proc_dostring);
3224 EXPORT_SYMBOL(proc_doulongvec_minmax);
3225 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3226 EXPORT_SYMBOL(register_sysctl_table);
3227 EXPORT_SYMBOL(register_sysctl_paths);
3228 EXPORT_SYMBOL(sysctl_intvec);
3229 EXPORT_SYMBOL(sysctl_jiffies);
3230 EXPORT_SYMBOL(sysctl_ms_jiffies);
3231 EXPORT_SYMBOL(sysctl_string);
3232 EXPORT_SYMBOL(sysctl_data);
3233 EXPORT_SYMBOL(unregister_sysctl_table);