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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/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/key.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/vmstat.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/acpi.h>
  49 #include <linux/reboot.h>
  50 #include <linux/ftrace.h>
  51
  52 #include <asm/uaccess.h>
  53 #include <asm/processor.h>
  54
  55 #ifdef CONFIG_X86
  56 #include <asm/nmi.h>
  57 #include <asm/stacktrace.h>
  58 #include <asm/io.h>
  59 #endif
  60
  61 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  62
  63 #if defined(CONFIG_SYSCTL)
  64
  65 /* External variables not in a header file. */
  66 extern int C_A_D;
  67 extern int print_fatal_signals;
  68 extern int sysctl_overcommit_memory;
  69 extern int sysctl_overcommit_ratio;
  70 extern int sysctl_panic_on_oom;
  71 extern int sysctl_oom_kill_allocating_task;
  72 extern int sysctl_oom_dump_tasks;
  73 extern int max_threads;
  74 extern int core_uses_pid;
  75 extern int suid_dumpable;
  76 extern char core_pattern[];
  77 extern int pid_max;
  78 extern int min_free_kbytes;
  79 extern int pid_max_min, pid_max_max;
  80 extern int sysctl_drop_caches;
  81 extern int percpu_pagelist_fraction;
  82 extern int compat_log;
  83 extern int maps_protect;
  84 extern int latencytop_enabled;
  85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  86 #ifdef CONFIG_RCU_TORTURE_TEST
  87 extern int rcutorture_runnable;
  88 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
  89
  90 /* Constants used for minimum and  maximum */
  91 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
  92 static int one = 1;
  93 #endif
  94
  95 #ifdef CONFIG_DETECT_SOFTLOCKUP
  96 static int sixty = 60;
  97 static int neg_one = -1;
  98 #endif
  99
 100 #ifdef CONFIG_MMU
 101 static int two = 2;
 102 #endif
 103
 104 static int zero;
 105 static int one_hundred = 100;
 106
 107 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 108 static int maxolduid = 65535;
 109 static int minolduid;
 110 static int min_percpu_pagelist_fract = 8;
 111
 112 static int ngroups_max = NGROUPS_MAX;
 113
 114 #ifdef CONFIG_MODULES
 115 extern char modprobe_path[];
 116 #endif
 117 #ifdef CONFIG_CHR_DEV_SG
 118 extern int sg_big_buff;
 119 #endif
 120
 121 #ifdef __sparc__
 122 extern char reboot_command [];
 123 extern int stop_a_enabled;
 124 extern int scons_pwroff;
 125 #endif
 126
 127 #ifdef __hppa__
 128 extern int pwrsw_enabled;
 129 extern int unaligned_enabled;
 130 #endif
 131
 132 #ifdef CONFIG_S390
 133 #ifdef CONFIG_MATHEMU
 134 extern int sysctl_ieee_emulation_warnings;
 135 #endif
 136 extern int sysctl_userprocess_debug;
 137 extern int spin_retry;
 138 #endif
 139
 140 #ifdef CONFIG_BSD_PROCESS_ACCT
 141 extern int acct_parm[];
 142 #endif
 143
 144 #ifdef CONFIG_IA64
 145 extern int no_unaligned_warning;
 146 #endif
 147
 148 #ifdef CONFIG_RT_MUTEXES
 149 extern int max_lock_depth;
 150 #endif
 151
 152 #ifdef CONFIG_PROC_SYSCTL
 153 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 154                   void __user *buffer, size_t *lenp, loff_t *ppos);
 155 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 156                                void __user *buffer, size_t *lenp, loff_t *ppos);
 157 #endif
 158
 159 static struct ctl_table root_table[];
 160 static struct ctl_table_root sysctl_table_root;
 161 static struct ctl_table_header root_table_header = {
 162         .ctl_table = root_table,
 163         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
 164         .root = &sysctl_table_root,
 165         .set = &sysctl_table_root.default_set,
 166 };
 167 static struct ctl_table_root sysctl_table_root = {
 168         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 169         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 170 };
 171
 172 static struct ctl_table kern_table[];
 173 static struct ctl_table vm_table[];
 174 static struct ctl_table fs_table[];
 175 static struct ctl_table debug_table[];
 176 static struct ctl_table dev_table[];
 177 extern struct ctl_table random_table[];
 178 #ifdef CONFIG_INOTIFY_USER
 179 extern struct ctl_table inotify_table[];
 180 #endif
 181
 182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 183 int sysctl_legacy_va_layout;
 184 #endif
 185
 186 extern int prove_locking;
 187 extern int lock_stat;
 188
 189 /* The default sysctl tables: */
 190
 191 static struct ctl_table root_table[] = {
 192         {
 193                 .ctl_name       = CTL_KERN,
 194                 .procname       = "kernel",
 195                 .mode           = 0555,
 196                 .child          = kern_table,
 197         },
 198         {
 199                 .ctl_name       = CTL_VM,
 200                 .procname       = "vm",
 201                 .mode           = 0555,
 202                 .child          = vm_table,
 203         },
 204         {
 205                 .ctl_name       = CTL_FS,
 206                 .procname       = "fs",
 207                 .mode           = 0555,
 208                 .child          = fs_table,
 209         },
 210         {
 211                 .ctl_name       = CTL_DEBUG,
 212                 .procname       = "debug",
 213                 .mode           = 0555,
 214                 .child          = debug_table,
 215         },
 216         {
 217                 .ctl_name       = CTL_DEV,
 218                 .procname       = "dev",
 219                 .mode           = 0555,
 220                 .child          = dev_table,
 221         },
 222 /*
 223  * NOTE: do not add new entries to this table unless you have read
 224  * Documentation/sysctl/ctl_unnumbered.txt
 225  */
 226         { .ctl_name = 0 }
 227 };
 228
 229 #ifdef CONFIG_SCHED_DEBUG
 230 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 231 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 232 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 233 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 234 #endif
 235
 236 static struct ctl_table kern_table[] = {
 237 #ifdef CONFIG_SCHED_DEBUG
 238         {
 239                 .ctl_name       = CTL_UNNUMBERED,
 240                 .procname       = "sched_min_granularity_ns",
 241                 .data           = &sysctl_sched_min_granularity,
 242                 .maxlen         = sizeof(unsigned int),
 243                 .mode           = 0644,
 244                 .proc_handler   = &sched_nr_latency_handler,
 245                 .strategy       = &sysctl_intvec,
 246                 .extra1         = &min_sched_granularity_ns,
 247                 .extra2         = &max_sched_granularity_ns,
 248         },
 249         {
 250                 .ctl_name       = CTL_UNNUMBERED,
 251                 .procname       = "sched_latency_ns",
 252                 .data           = &sysctl_sched_latency,
 253                 .maxlen         = sizeof(unsigned int),
 254                 .mode           = 0644,
 255                 .proc_handler   = &sched_nr_latency_handler,
 256                 .strategy       = &sysctl_intvec,
 257                 .extra1         = &min_sched_granularity_ns,
 258                 .extra2         = &max_sched_granularity_ns,
 259         },
 260         {
 261                 .ctl_name       = CTL_UNNUMBERED,
 262                 .procname       = "sched_wakeup_granularity_ns",
 263                 .data           = &sysctl_sched_wakeup_granularity,
 264                 .maxlen         = sizeof(unsigned int),
 265                 .mode           = 0644,
 266                 .proc_handler   = &proc_dointvec_minmax,
 267                 .strategy       = &sysctl_intvec,
 268                 .extra1         = &min_wakeup_granularity_ns,
 269                 .extra2         = &max_wakeup_granularity_ns,
 270         },
 271         {
 272                 .ctl_name       = CTL_UNNUMBERED,
 273                 .procname       = "sched_shares_ratelimit",
 274                 .data           = &sysctl_sched_shares_ratelimit,
 275                 .maxlen         = sizeof(unsigned int),
 276                 .mode           = 0644,
 277                 .proc_handler   = &proc_dointvec,
 278         },
 279         {
 280                 .ctl_name       = CTL_UNNUMBERED,
 281                 .procname       = "sched_child_runs_first",
 282                 .data           = &sysctl_sched_child_runs_first,
 283                 .maxlen         = sizeof(unsigned int),
 284                 .mode           = 0644,
 285                 .proc_handler   = &proc_dointvec,
 286         },
 287         {
 288                 .ctl_name       = CTL_UNNUMBERED,
 289                 .procname       = "sched_features",
 290                 .data           = &sysctl_sched_features,
 291                 .maxlen         = sizeof(unsigned int),
 292                 .mode           = 0644,
 293                 .proc_handler   = &proc_dointvec,
 294         },
 295         {
 296                 .ctl_name       = CTL_UNNUMBERED,
 297                 .procname       = "sched_migration_cost",
 298                 .data           = &sysctl_sched_migration_cost,
 299                 .maxlen         = sizeof(unsigned int),
 300                 .mode           = 0644,
 301                 .proc_handler   = &proc_dointvec,
 302         },
 303         {
 304                 .ctl_name       = CTL_UNNUMBERED,
 305                 .procname       = "sched_nr_migrate",
 306                 .data           = &sysctl_sched_nr_migrate,
 307                 .maxlen         = sizeof(unsigned int),
 308                 .mode           = 0644,
 309                 .proc_handler   = &proc_dointvec,
 310         },
 311 #endif
 312         {
 313                 .ctl_name       = CTL_UNNUMBERED,
 314                 .procname       = "sched_rt_period_us",
 315                 .data           = &sysctl_sched_rt_period,
 316                 .maxlen         = sizeof(unsigned int),
 317                 .mode           = 0644,
 318                 .proc_handler   = &sched_rt_handler,
 319         },
 320         {
 321                 .ctl_name       = CTL_UNNUMBERED,
 322                 .procname       = "sched_rt_runtime_us",
 323                 .data           = &sysctl_sched_rt_runtime,
 324                 .maxlen         = sizeof(int),
 325                 .mode           = 0644,
 326                 .proc_handler   = &sched_rt_handler,
 327         },
 328         {
 329                 .ctl_name       = CTL_UNNUMBERED,
 330                 .procname       = "sched_compat_yield",
 331                 .data           = &sysctl_sched_compat_yield,
 332                 .maxlen         = sizeof(unsigned int),
 333                 .mode           = 0644,
 334                 .proc_handler   = &proc_dointvec,
 335         },
 336 #ifdef CONFIG_PROVE_LOCKING
 337         {
 338                 .ctl_name       = CTL_UNNUMBERED,
 339                 .procname       = "prove_locking",
 340                 .data           = &prove_locking,
 341                 .maxlen         = sizeof(int),
 342                 .mode           = 0644,
 343                 .proc_handler   = &proc_dointvec,
 344         },
 345 #endif
 346 #ifdef CONFIG_LOCK_STAT
 347         {
 348                 .ctl_name       = CTL_UNNUMBERED,
 349                 .procname       = "lock_stat",
 350                 .data           = &lock_stat,
 351                 .maxlen         = sizeof(int),
 352                 .mode           = 0644,
 353                 .proc_handler   = &proc_dointvec,
 354         },
 355 #endif
 356         {
 357                 .ctl_name       = KERN_PANIC,
 358                 .procname       = "panic",
 359                 .data           = &panic_timeout,
 360                 .maxlen         = sizeof(int),
 361                 .mode           = 0644,
 362                 .proc_handler   = &proc_dointvec,
 363         },
 364         {
 365                 .ctl_name       = KERN_CORE_USES_PID,
 366                 .procname       = "core_uses_pid",
 367                 .data           = &core_uses_pid,
 368                 .maxlen         = sizeof(int),
 369                 .mode           = 0644,
 370                 .proc_handler   = &proc_dointvec,
 371         },
 372         {
 373                 .ctl_name       = KERN_CORE_PATTERN,
 374                 .procname       = "core_pattern",
 375                 .data           = core_pattern,
 376                 .maxlen         = CORENAME_MAX_SIZE,
 377                 .mode           = 0644,
 378                 .proc_handler   = &proc_dostring,
 379                 .strategy       = &sysctl_string,
 380         },
 381 #ifdef CONFIG_PROC_SYSCTL
 382         {
 383                 .procname       = "tainted",
 384                 .data           = &tainted,
 385                 .maxlen         = sizeof(int),
 386                 .mode           = 0644,
 387                 .proc_handler   = &proc_dointvec_taint,
 388         },
 389 #endif
 390 #ifdef CONFIG_LATENCYTOP
 391         {
 392                 .procname       = "latencytop",
 393                 .data           = &latencytop_enabled,
 394                 .maxlen         = sizeof(int),
 395                 .mode           = 0644,
 396                 .proc_handler   = &proc_dointvec,
 397         },
 398 #endif
 399 #ifdef CONFIG_BLK_DEV_INITRD
 400         {
 401                 .ctl_name       = KERN_REALROOTDEV,
 402                 .procname       = "real-root-dev",
 403                 .data           = &real_root_dev,
 404                 .maxlen         = sizeof(int),
 405                 .mode           = 0644,
 406                 .proc_handler   = &proc_dointvec,
 407         },
 408 #endif
 409         {
 410                 .ctl_name       = CTL_UNNUMBERED,
 411                 .procname       = "print-fatal-signals",
 412                 .data           = &print_fatal_signals,
 413                 .maxlen         = sizeof(int),
 414                 .mode           = 0644,
 415                 .proc_handler   = &proc_dointvec,
 416         },
 417 #ifdef __sparc__
 418         {
 419                 .ctl_name       = KERN_SPARC_REBOOT,
 420                 .procname       = "reboot-cmd",
 421                 .data           = reboot_command,
 422                 .maxlen         = 256,
 423                 .mode           = 0644,
 424                 .proc_handler   = &proc_dostring,
 425                 .strategy       = &sysctl_string,
 426         },
 427         {
 428                 .ctl_name       = KERN_SPARC_STOP_A,
 429                 .procname       = "stop-a",
 430                 .data           = &stop_a_enabled,
 431                 .maxlen         = sizeof (int),
 432                 .mode           = 0644,
 433                 .proc_handler   = &proc_dointvec,
 434         },
 435         {
 436                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 437                 .procname       = "scons-poweroff",
 438                 .data           = &scons_pwroff,
 439                 .maxlen         = sizeof (int),
 440                 .mode           = 0644,
 441                 .proc_handler   = &proc_dointvec,
 442         },
 443 #endif
 444 #ifdef __hppa__
 445         {
 446                 .ctl_name       = KERN_HPPA_PWRSW,
 447                 .procname       = "soft-power",
 448                 .data           = &pwrsw_enabled,
 449                 .maxlen         = sizeof (int),
 450                 .mode           = 0644,
 451                 .proc_handler   = &proc_dointvec,
 452         },
 453         {
 454                 .ctl_name       = KERN_HPPA_UNALIGNED,
 455                 .procname       = "unaligned-trap",
 456                 .data           = &unaligned_enabled,
 457                 .maxlen         = sizeof (int),
 458                 .mode           = 0644,
 459                 .proc_handler   = &proc_dointvec,
 460         },
 461 #endif
 462         {
 463                 .ctl_name       = KERN_CTLALTDEL,
 464                 .procname       = "ctrl-alt-del",
 465                 .data           = &C_A_D,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = &proc_dointvec,
 469         },
 470 #ifdef CONFIG_FTRACE
 471         {
 472                 .ctl_name       = CTL_UNNUMBERED,
 473                 .procname       = "ftrace_enabled",
 474                 .data           = &ftrace_enabled,
 475                 .maxlen         = sizeof(int),
 476                 .mode           = 0644,
 477                 .proc_handler   = &ftrace_enable_sysctl,
 478         },
 479 #endif
 480 #ifdef CONFIG_MODULES
 481         {
 482                 .ctl_name       = KERN_MODPROBE,
 483                 .procname       = "modprobe",
 484                 .data           = &modprobe_path,
 485                 .maxlen         = KMOD_PATH_LEN,
 486                 .mode           = 0644,
 487                 .proc_handler   = &proc_dostring,
 488                 .strategy       = &sysctl_string,
 489         },
 490 #endif
 491 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 492         {
 493                 .ctl_name       = KERN_HOTPLUG,
 494                 .procname       = "hotplug",
 495                 .data           = &uevent_helper,
 496                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 497                 .mode           = 0644,
 498                 .proc_handler   = &proc_dostring,
 499                 .strategy       = &sysctl_string,
 500         },
 501 #endif
 502 #ifdef CONFIG_CHR_DEV_SG
 503         {
 504                 .ctl_name       = KERN_SG_BIG_BUFF,
 505                 .procname       = "sg-big-buff",
 506                 .data           = &sg_big_buff,
 507                 .maxlen         = sizeof (int),
 508                 .mode           = 0444,
 509                 .proc_handler   = &proc_dointvec,
 510         },
 511 #endif
 512 #ifdef CONFIG_BSD_PROCESS_ACCT
 513         {
 514                 .ctl_name       = KERN_ACCT,
 515                 .procname       = "acct",
 516                 .data           = &acct_parm,
 517                 .maxlen         = 3*sizeof(int),
 518                 .mode           = 0644,
 519                 .proc_handler   = &proc_dointvec,
 520         },
 521 #endif
 522 #ifdef CONFIG_MAGIC_SYSRQ
 523         {
 524                 .ctl_name       = KERN_SYSRQ,
 525                 .procname       = "sysrq",
 526                 .data           = &__sysrq_enabled,
 527                 .maxlen         = sizeof (int),
 528                 .mode           = 0644,
 529                 .proc_handler   = &proc_dointvec,
 530         },
 531 #endif
 532 #ifdef CONFIG_PROC_SYSCTL
 533         {
 534                 .procname       = "cad_pid",
 535                 .data           = NULL,
 536                 .maxlen         = sizeof (int),
 537                 .mode           = 0600,
 538                 .proc_handler   = &proc_do_cad_pid,
 539         },
 540 #endif
 541         {
 542                 .ctl_name       = KERN_MAX_THREADS,
 543                 .procname       = "threads-max",
 544                 .data           = &max_threads,
 545                 .maxlen         = sizeof(int),
 546                 .mode           = 0644,
 547                 .proc_handler   = &proc_dointvec,
 548         },
 549         {
 550                 .ctl_name       = KERN_RANDOM,
 551                 .procname       = "random",
 552                 .mode           = 0555,
 553                 .child          = random_table,
 554         },
 555         {
 556                 .ctl_name       = KERN_OVERFLOWUID,
 557                 .procname       = "overflowuid",
 558                 .data           = &overflowuid,
 559                 .maxlen         = sizeof(int),
 560                 .mode           = 0644,
 561                 .proc_handler   = &proc_dointvec_minmax,
 562                 .strategy       = &sysctl_intvec,
 563                 .extra1         = &minolduid,
 564                 .extra2         = &maxolduid,
 565         },
 566         {
 567                 .ctl_name       = KERN_OVERFLOWGID,
 568                 .procname       = "overflowgid",
 569                 .data           = &overflowgid,
 570                 .maxlen         = sizeof(int),
 571                 .mode           = 0644,
 572                 .proc_handler   = &proc_dointvec_minmax,
 573                 .strategy       = &sysctl_intvec,
 574                 .extra1         = &minolduid,
 575                 .extra2         = &maxolduid,
 576         },
 577 #ifdef CONFIG_S390
 578 #ifdef CONFIG_MATHEMU
 579         {
 580                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 581                 .procname       = "ieee_emulation_warnings",
 582                 .data           = &sysctl_ieee_emulation_warnings,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec,
 586         },
 587 #endif
 588         {
 589                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 590                 .procname       = "userprocess_debug",
 591                 .data           = &sysctl_userprocess_debug,
 592                 .maxlen         = sizeof(int),
 593                 .mode           = 0644,
 594                 .proc_handler   = &proc_dointvec,
 595         },
 596 #endif
 597         {
 598                 .ctl_name       = KERN_PIDMAX,
 599                 .procname       = "pid_max",
 600                 .data           = &pid_max,
 601                 .maxlen         = sizeof (int),
 602                 .mode           = 0644,
 603                 .proc_handler   = &proc_dointvec_minmax,
 604                 .strategy       = sysctl_intvec,
 605                 .extra1         = &pid_max_min,
 606                 .extra2         = &pid_max_max,
 607         },
 608         {
 609                 .ctl_name       = KERN_PANIC_ON_OOPS,
 610                 .procname       = "panic_on_oops",
 611                 .data           = &panic_on_oops,
 612                 .maxlen         = sizeof(int),
 613                 .mode           = 0644,
 614                 .proc_handler   = &proc_dointvec,
 615         },
 616 #if defined CONFIG_PRINTK
 617         {
 618                 .ctl_name       = KERN_PRINTK,
 619                 .procname       = "printk",
 620                 .data           = &console_loglevel,
 621                 .maxlen         = 4*sizeof(int),
 622                 .mode           = 0644,
 623                 .proc_handler   = &proc_dointvec,
 624         },
 625         {
 626                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 627                 .procname       = "printk_ratelimit",
 628                 .data           = &printk_ratelimit_state.interval,
 629                 .maxlen         = sizeof(int),
 630                 .mode           = 0644,
 631                 .proc_handler   = &proc_dointvec_jiffies,
 632                 .strategy       = &sysctl_jiffies,
 633         },
 634         {
 635                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 636                 .procname       = "printk_ratelimit_burst",
 637                 .data           = &printk_ratelimit_state.burst,
 638                 .maxlen         = sizeof(int),
 639                 .mode           = 0644,
 640                 .proc_handler   = &proc_dointvec,
 641         },
 642 #endif
 643         {
 644                 .ctl_name       = KERN_NGROUPS_MAX,
 645                 .procname       = "ngroups_max",
 646                 .data           = &ngroups_max,
 647                 .maxlen         = sizeof (int),
 648                 .mode           = 0444,
 649                 .proc_handler   = &proc_dointvec,
 650         },
 651 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 652         {
 653                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 654                 .procname       = "unknown_nmi_panic",
 655                 .data           = &unknown_nmi_panic,
 656                 .maxlen         = sizeof (int),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_dointvec,
 659         },
 660         {
 661                 .procname       = "nmi_watchdog",
 662                 .data           = &nmi_watchdog_enabled,
 663                 .maxlen         = sizeof (int),
 664                 .mode           = 0644,
 665                 .proc_handler   = &proc_nmi_enabled,
 666         },
 667 #endif
 668 #if defined(CONFIG_X86)
 669         {
 670                 .ctl_name       = KERN_PANIC_ON_NMI,
 671                 .procname       = "panic_on_unrecovered_nmi",
 672                 .data           = &panic_on_unrecovered_nmi,
 673                 .maxlen         = sizeof(int),
 674                 .mode           = 0644,
 675                 .proc_handler   = &proc_dointvec,
 676         },
 677         {
 678                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 679                 .procname       = "bootloader_type",
 680                 .data           = &bootloader_type,
 681                 .maxlen         = sizeof (int),
 682                 .mode           = 0444,
 683                 .proc_handler   = &proc_dointvec,
 684         },
 685         {
 686                 .ctl_name       = CTL_UNNUMBERED,
 687                 .procname       = "kstack_depth_to_print",
 688                 .data           = &kstack_depth_to_print,
 689                 .maxlen         = sizeof(int),
 690                 .mode           = 0644,
 691                 .proc_handler   = &proc_dointvec,
 692         },
 693         {
 694                 .ctl_name       = CTL_UNNUMBERED,
 695                 .procname       = "io_delay_type",
 696                 .data           = &io_delay_type,
 697                 .maxlen         = sizeof(int),
 698                 .mode           = 0644,
 699                 .proc_handler   = &proc_dointvec,
 700         },
 701 #endif
 702 #if defined(CONFIG_MMU)
 703         {
 704                 .ctl_name       = KERN_RANDOMIZE,
 705                 .procname       = "randomize_va_space",
 706                 .data           = &randomize_va_space,
 707                 .maxlen         = sizeof(int),
 708                 .mode           = 0644,
 709                 .proc_handler   = &proc_dointvec,
 710         },
 711 #endif
 712 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 713         {
 714                 .ctl_name       = KERN_SPIN_RETRY,
 715                 .procname       = "spin_retry",
 716                 .data           = &spin_retry,
 717                 .maxlen         = sizeof (int),
 718                 .mode           = 0644,
 719                 .proc_handler   = &proc_dointvec,
 720         },
 721 #endif
 722 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 723         {
 724                 .procname       = "acpi_video_flags",
 725                 .data           = &acpi_realmode_flags,
 726                 .maxlen         = sizeof (unsigned long),
 727                 .mode           = 0644,
 728                 .proc_handler   = &proc_doulongvec_minmax,
 729         },
 730 #endif
 731 #ifdef CONFIG_IA64
 732         {
 733                 .ctl_name       = KERN_IA64_UNALIGNED,
 734                 .procname       = "ignore-unaligned-usertrap",
 735                 .data           = &no_unaligned_warning,
 736                 .maxlen         = sizeof (int),
 737                 .mode           = 0644,
 738                 .proc_handler   = &proc_dointvec,
 739         },
 740 #endif
 741 #ifdef CONFIG_DETECT_SOFTLOCKUP
 742         {
 743                 .ctl_name       = CTL_UNNUMBERED,
 744                 .procname       = "softlockup_panic",
 745                 .data           = &softlockup_panic,
 746                 .maxlen         = sizeof(int),
 747                 .mode           = 0644,
 748                 .proc_handler   = &proc_dointvec_minmax,
 749                 .strategy       = &sysctl_intvec,
 750                 .extra1         = &zero,
 751                 .extra2         = &one,
 752         },
 753         {
 754                 .ctl_name       = CTL_UNNUMBERED,
 755                 .procname       = "softlockup_thresh",
 756                 .data           = &softlockup_thresh,
 757                 .maxlen         = sizeof(int),
 758                 .mode           = 0644,
 759                 .proc_handler   = &proc_dointvec_minmax,
 760                 .strategy       = &sysctl_intvec,
 761                 .extra1         = &neg_one,
 762                 .extra2         = &sixty,
 763         },
 764         {
 765                 .ctl_name       = CTL_UNNUMBERED,
 766                 .procname       = "hung_task_check_count",
 767                 .data           = &sysctl_hung_task_check_count,
 768                 .maxlen         = sizeof(unsigned long),
 769                 .mode           = 0644,
 770                 .proc_handler   = &proc_doulongvec_minmax,
 771                 .strategy       = &sysctl_intvec,
 772         },
 773         {
 774                 .ctl_name       = CTL_UNNUMBERED,
 775                 .procname       = "hung_task_timeout_secs",
 776                 .data           = &sysctl_hung_task_timeout_secs,
 777                 .maxlen         = sizeof(unsigned long),
 778                 .mode           = 0644,
 779                 .proc_handler   = &proc_doulongvec_minmax,
 780                 .strategy       = &sysctl_intvec,
 781         },
 782         {
 783                 .ctl_name       = CTL_UNNUMBERED,
 784                 .procname       = "hung_task_warnings",
 785                 .data           = &sysctl_hung_task_warnings,
 786                 .maxlen         = sizeof(unsigned long),
 787                 .mode           = 0644,
 788                 .proc_handler   = &proc_doulongvec_minmax,
 789                 .strategy       = &sysctl_intvec,
 790         },
 791 #endif
 792 #ifdef CONFIG_COMPAT
 793         {
 794                 .ctl_name       = KERN_COMPAT_LOG,
 795                 .procname       = "compat-log",
 796                 .data           = &compat_log,
 797                 .maxlen         = sizeof (int),
 798                 .mode           = 0644,
 799                 .proc_handler   = &proc_dointvec,
 800         },
 801 #endif
 802 #ifdef CONFIG_RT_MUTEXES
 803         {
 804                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 805                 .procname       = "max_lock_depth",
 806                 .data           = &max_lock_depth,
 807                 .maxlen         = sizeof(int),
 808                 .mode           = 0644,
 809                 .proc_handler   = &proc_dointvec,
 810         },
 811 #endif
 812 #ifdef CONFIG_PROC_FS
 813         {
 814                 .ctl_name       = CTL_UNNUMBERED,
 815                 .procname       = "maps_protect",
 816                 .data           = &maps_protect,
 817                 .maxlen         = sizeof(int),
 818                 .mode           = 0644,
 819                 .proc_handler   = &proc_dointvec,
 820         },
 821 #endif
 822         {
 823                 .ctl_name       = CTL_UNNUMBERED,
 824                 .procname       = "poweroff_cmd",
 825                 .data           = &poweroff_cmd,
 826                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 827                 .mode           = 0644,
 828                 .proc_handler   = &proc_dostring,
 829                 .strategy       = &sysctl_string,
 830         },
 831 #ifdef CONFIG_KEYS
 832         {
 833                 .ctl_name       = CTL_UNNUMBERED,
 834                 .procname       = "keys",
 835                 .mode           = 0555,
 836                 .child          = key_sysctls,
 837         },
 838 #endif
 839 #ifdef CONFIG_RCU_TORTURE_TEST
 840         {
 841                 .ctl_name       = CTL_UNNUMBERED,
 842                 .procname       = "rcutorture_runnable",
 843                 .data           = &rcutorture_runnable,
 844                 .maxlen         = sizeof(int),
 845                 .mode           = 0644,
 846                 .proc_handler   = &proc_dointvec,
 847         },
 848 #endif
 849 /*
 850  * NOTE: do not add new entries to this table unless you have read
 851  * Documentation/sysctl/ctl_unnumbered.txt
 852  */
 853         { .ctl_name = 0 }
 854 };
 855
 856 static struct ctl_table vm_table[] = {
 857         {
 858                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 859                 .procname       = "overcommit_memory",
 860                 .data           = &sysctl_overcommit_memory,
 861                 .maxlen         = sizeof(sysctl_overcommit_memory),
 862                 .mode           = 0644,
 863                 .proc_handler   = &proc_dointvec,
 864         },
 865         {
 866                 .ctl_name       = VM_PANIC_ON_OOM,
 867                 .procname       = "panic_on_oom",
 868                 .data           = &sysctl_panic_on_oom,
 869                 .maxlen         = sizeof(sysctl_panic_on_oom),
 870                 .mode           = 0644,
 871                 .proc_handler   = &proc_dointvec,
 872         },
 873         {
 874                 .ctl_name       = CTL_UNNUMBERED,
 875                 .procname       = "oom_kill_allocating_task",
 876                 .data           = &sysctl_oom_kill_allocating_task,
 877                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 878                 .mode           = 0644,
 879                 .proc_handler   = &proc_dointvec,
 880         },
 881         {
 882                 .ctl_name       = CTL_UNNUMBERED,
 883                 .procname       = "oom_dump_tasks",
 884                 .data           = &sysctl_oom_dump_tasks,
 885                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 886                 .mode           = 0644,
 887                 .proc_handler   = &proc_dointvec,
 888         },
 889         {
 890                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 891                 .procname       = "overcommit_ratio",
 892                 .data           = &sysctl_overcommit_ratio,
 893                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 894                 .mode           = 0644,
 895                 .proc_handler   = &proc_dointvec,
 896         },
 897         {
 898                 .ctl_name       = VM_PAGE_CLUSTER,
 899                 .procname       = "page-cluster",
 900                 .data           = &page_cluster,
 901                 .maxlen         = sizeof(int),
 902                 .mode           = 0644,
 903                 .proc_handler   = &proc_dointvec,
 904         },
 905         {
 906                 .ctl_name       = VM_DIRTY_BACKGROUND,
 907                 .procname       = "dirty_background_ratio",
 908                 .data           = &dirty_background_ratio,
 909                 .maxlen         = sizeof(dirty_background_ratio),
 910                 .mode           = 0644,
 911                 .proc_handler   = &proc_dointvec_minmax,
 912                 .strategy       = &sysctl_intvec,
 913                 .extra1         = &zero,
 914                 .extra2         = &one_hundred,
 915         },
 916         {
 917                 .ctl_name       = VM_DIRTY_RATIO,
 918                 .procname       = "dirty_ratio",
 919                 .data           = &vm_dirty_ratio,
 920                 .maxlen         = sizeof(vm_dirty_ratio),
 921                 .mode           = 0644,
 922                 .proc_handler   = &dirty_ratio_handler,
 923                 .strategy       = &sysctl_intvec,
 924                 .extra1         = &zero,
 925                 .extra2         = &one_hundred,
 926         },
 927         {
 928                 .procname       = "dirty_writeback_centisecs",
 929                 .data           = &dirty_writeback_interval,
 930                 .maxlen         = sizeof(dirty_writeback_interval),
 931                 .mode           = 0644,
 932                 .proc_handler   = &dirty_writeback_centisecs_handler,
 933         },
 934         {
 935                 .procname       = "dirty_expire_centisecs",
 936                 .data           = &dirty_expire_interval,
 937                 .maxlen         = sizeof(dirty_expire_interval),
 938                 .mode           = 0644,
 939                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 940         },
 941         {
 942                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 943                 .procname       = "nr_pdflush_threads",
 944                 .data           = &nr_pdflush_threads,
 945                 .maxlen         = sizeof nr_pdflush_threads,
 946                 .mode           = 0444 /* read-only*/,
 947                 .proc_handler   = &proc_dointvec,
 948         },
 949         {
 950                 .ctl_name       = VM_SWAPPINESS,
 951                 .procname       = "swappiness",
 952                 .data           = &vm_swappiness,
 953                 .maxlen         = sizeof(vm_swappiness),
 954                 .mode           = 0644,
 955                 .proc_handler   = &proc_dointvec_minmax,
 956                 .strategy       = &sysctl_intvec,
 957                 .extra1         = &zero,
 958                 .extra2         = &one_hundred,
 959         },
 960 #ifdef CONFIG_HUGETLB_PAGE
 961          {
 962                 .procname       = "nr_hugepages",
 963                 .data           = NULL,
 964                 .maxlen         = sizeof(unsigned long),
 965                 .mode           = 0644,
 966                 .proc_handler   = &hugetlb_sysctl_handler,
 967                 .extra1         = (void *)&hugetlb_zero,
 968                 .extra2         = (void *)&hugetlb_infinity,
 969          },
 970          {
 971                 .ctl_name       = VM_HUGETLB_GROUP,
 972                 .procname       = "hugetlb_shm_group",
 973                 .data           = &sysctl_hugetlb_shm_group,
 974                 .maxlen         = sizeof(gid_t),
 975                 .mode           = 0644,
 976                 .proc_handler   = &proc_dointvec,
 977          },
 978          {
 979                 .ctl_name       = CTL_UNNUMBERED,
 980                 .procname       = "hugepages_treat_as_movable",
 981                 .data           = &hugepages_treat_as_movable,
 982                 .maxlen         = sizeof(int),
 983                 .mode           = 0644,
 984                 .proc_handler   = &hugetlb_treat_movable_handler,
 985         },
 986         {
 987                 .ctl_name       = CTL_UNNUMBERED,
 988                 .procname       = "nr_overcommit_hugepages",
 989                 .data           = NULL,
 990                 .maxlen         = sizeof(unsigned long),
 991                 .mode           = 0644,
 992                 .proc_handler   = &hugetlb_overcommit_handler,
 993                 .extra1         = (void *)&hugetlb_zero,
 994                 .extra2         = (void *)&hugetlb_infinity,
 995         },
 996 #endif
 997         {
 998                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 999                 .procname       = "lowmem_reserve_ratio",
1000                 .data           = &sysctl_lowmem_reserve_ratio,
1001                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1002                 .mode           = 0644,
1003                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1004                 .strategy       = &sysctl_intvec,
1005         },
1006         {
1007                 .ctl_name       = VM_DROP_PAGECACHE,
1008                 .procname       = "drop_caches",
1009                 .data           = &sysctl_drop_caches,
1010                 .maxlen         = sizeof(int),
1011                 .mode           = 0644,
1012                 .proc_handler   = drop_caches_sysctl_handler,
1013                 .strategy       = &sysctl_intvec,
1014         },
1015         {
1016                 .ctl_name       = VM_MIN_FREE_KBYTES,
1017                 .procname       = "min_free_kbytes",
1018                 .data           = &min_free_kbytes,
1019                 .maxlen         = sizeof(min_free_kbytes),
1020                 .mode           = 0644,
1021                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1022                 .strategy       = &sysctl_intvec,
1023                 .extra1         = &zero,
1024         },
1025         {
1026                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1027                 .procname       = "percpu_pagelist_fraction",
1028                 .data           = &percpu_pagelist_fraction,
1029                 .maxlen         = sizeof(percpu_pagelist_fraction),
1030                 .mode           = 0644,
1031                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1032                 .strategy       = &sysctl_intvec,
1033                 .extra1         = &min_percpu_pagelist_fract,
1034         },
1035 #ifdef CONFIG_MMU
1036         {
1037                 .ctl_name       = VM_MAX_MAP_COUNT,
1038                 .procname       = "max_map_count",
1039                 .data           = &sysctl_max_map_count,
1040                 .maxlen         = sizeof(sysctl_max_map_count),
1041                 .mode           = 0644,
1042                 .proc_handler   = &proc_dointvec
1043         },
1044 #endif
1045         {
1046                 .ctl_name       = VM_LAPTOP_MODE,
1047                 .procname       = "laptop_mode",
1048                 .data           = &laptop_mode,
1049                 .maxlen         = sizeof(laptop_mode),
1050                 .mode           = 0644,
1051                 .proc_handler   = &proc_dointvec_jiffies,
1052                 .strategy       = &sysctl_jiffies,
1053         },
1054         {
1055                 .ctl_name       = VM_BLOCK_DUMP,
1056                 .procname       = "block_dump",
1057                 .data           = &block_dump,
1058                 .maxlen         = sizeof(block_dump),
1059                 .mode           = 0644,
1060                 .proc_handler   = &proc_dointvec,
1061                 .strategy       = &sysctl_intvec,
1062                 .extra1         = &zero,
1063         },
1064         {
1065                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1066                 .procname       = "vfs_cache_pressure",
1067                 .data           = &sysctl_vfs_cache_pressure,
1068                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1069                 .mode           = 0644,
1070                 .proc_handler   = &proc_dointvec,
1071                 .strategy       = &sysctl_intvec,
1072                 .extra1         = &zero,
1073         },
1074 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1075         {
1076                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1077                 .procname       = "legacy_va_layout",
1078                 .data           = &sysctl_legacy_va_layout,
1079                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1080                 .mode           = 0644,
1081                 .proc_handler   = &proc_dointvec,
1082                 .strategy       = &sysctl_intvec,
1083                 .extra1         = &zero,
1084         },
1085 #endif
1086 #ifdef CONFIG_NUMA
1087         {
1088                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1089                 .procname       = "zone_reclaim_mode",
1090                 .data           = &zone_reclaim_mode,
1091                 .maxlen         = sizeof(zone_reclaim_mode),
1092                 .mode           = 0644,
1093                 .proc_handler   = &proc_dointvec,
1094                 .strategy       = &sysctl_intvec,
1095                 .extra1         = &zero,
1096         },
1097         {
1098                 .ctl_name       = VM_MIN_UNMAPPED,
1099                 .procname       = "min_unmapped_ratio",
1100                 .data           = &sysctl_min_unmapped_ratio,
1101                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1102                 .mode           = 0644,
1103                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1104                 .strategy       = &sysctl_intvec,
1105                 .extra1         = &zero,
1106                 .extra2         = &one_hundred,
1107         },
1108         {
1109                 .ctl_name       = VM_MIN_SLAB,
1110                 .procname       = "min_slab_ratio",
1111                 .data           = &sysctl_min_slab_ratio,
1112                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1113                 .mode           = 0644,
1114                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1115                 .strategy       = &sysctl_intvec,
1116                 .extra1         = &zero,
1117                 .extra2         = &one_hundred,
1118         },
1119 #endif
1120 #ifdef CONFIG_SMP
1121         {
1122                 .ctl_name       = CTL_UNNUMBERED,
1123                 .procname       = "stat_interval",
1124                 .data           = &sysctl_stat_interval,
1125                 .maxlen         = sizeof(sysctl_stat_interval),
1126                 .mode           = 0644,
1127                 .proc_handler   = &proc_dointvec_jiffies,
1128                 .strategy       = &sysctl_jiffies,
1129         },
1130 #endif
1131 #ifdef CONFIG_SECURITY
1132         {
1133                 .ctl_name       = CTL_UNNUMBERED,
1134                 .procname       = "mmap_min_addr",
1135                 .data           = &mmap_min_addr,
1136                 .maxlen         = sizeof(unsigned long),
1137                 .mode           = 0644,
1138                 .proc_handler   = &proc_doulongvec_minmax,
1139         },
1140 #endif
1141 #ifdef CONFIG_NUMA
1142         {
1143                 .ctl_name       = CTL_UNNUMBERED,
1144                 .procname       = "numa_zonelist_order",
1145                 .data           = &numa_zonelist_order,
1146                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1147                 .mode           = 0644,
1148                 .proc_handler   = &numa_zonelist_order_handler,
1149                 .strategy       = &sysctl_string,
1150         },
1151 #endif
1152 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1153    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1154         {
1155                 .ctl_name       = VM_VDSO_ENABLED,
1156                 .procname       = "vdso_enabled",
1157                 .data           = &vdso_enabled,
1158                 .maxlen         = sizeof(vdso_enabled),
1159                 .mode           = 0644,
1160                 .proc_handler   = &proc_dointvec,
1161                 .strategy       = &sysctl_intvec,
1162                 .extra1         = &zero,
1163         },
1164 #endif
1165 #ifdef CONFIG_HIGHMEM
1166         {
1167                 .ctl_name       = CTL_UNNUMBERED,
1168                 .procname       = "highmem_is_dirtyable",
1169                 .data           = &vm_highmem_is_dirtyable,
1170                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1171                 .mode           = 0644,
1172                 .proc_handler   = &proc_dointvec_minmax,
1173                 .strategy       = &sysctl_intvec,
1174                 .extra1         = &zero,
1175                 .extra2         = &one,
1176         },
1177 #endif
1178 /*
1179  * NOTE: do not add new entries to this table unless you have read
1180  * Documentation/sysctl/ctl_unnumbered.txt
1181  */
1182         { .ctl_name = 0 }
1183 };
1184
1185 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1186 static struct ctl_table binfmt_misc_table[] = {
1187         { .ctl_name = 0 }
1188 };
1189 #endif
1190
1191 static struct ctl_table fs_table[] = {
1192         {
1193                 .ctl_name       = FS_NRINODE,
1194                 .procname       = "inode-nr",
1195                 .data           = &inodes_stat,
1196                 .maxlen         = 2*sizeof(int),
1197                 .mode           = 0444,
1198                 .proc_handler   = &proc_dointvec,
1199         },
1200         {
1201                 .ctl_name       = FS_STATINODE,
1202                 .procname       = "inode-state",
1203                 .data           = &inodes_stat,
1204                 .maxlen         = 7*sizeof(int),
1205                 .mode           = 0444,
1206                 .proc_handler   = &proc_dointvec,
1207         },
1208         {
1209                 .procname       = "file-nr",
1210                 .data           = &files_stat,
1211                 .maxlen         = 3*sizeof(int),
1212                 .mode           = 0444,
1213                 .proc_handler   = &proc_nr_files,
1214         },
1215         {
1216                 .ctl_name       = FS_MAXFILE,
1217                 .procname       = "file-max",
1218                 .data           = &files_stat.max_files,
1219                 .maxlen         = sizeof(int),
1220                 .mode           = 0644,
1221                 .proc_handler   = &proc_dointvec,
1222         },
1223         {
1224                 .ctl_name       = CTL_UNNUMBERED,
1225                 .procname       = "nr_open",
1226                 .data           = &sysctl_nr_open,
1227                 .maxlen         = sizeof(int),
1228                 .mode           = 0644,
1229                 .proc_handler   = &proc_dointvec_minmax,
1230                 .extra1         = &sysctl_nr_open_min,
1231                 .extra2         = &sysctl_nr_open_max,
1232         },
1233         {
1234                 .ctl_name       = FS_DENTRY,
1235                 .procname       = "dentry-state",
1236                 .data           = &dentry_stat,
1237                 .maxlen         = 6*sizeof(int),
1238                 .mode           = 0444,
1239                 .proc_handler   = &proc_dointvec,
1240         },
1241         {
1242                 .ctl_name       = FS_OVERFLOWUID,
1243                 .procname       = "overflowuid",
1244                 .data           = &fs_overflowuid,
1245                 .maxlen         = sizeof(int),
1246                 .mode           = 0644,
1247                 .proc_handler   = &proc_dointvec_minmax,
1248                 .strategy       = &sysctl_intvec,
1249                 .extra1         = &minolduid,
1250                 .extra2         = &maxolduid,
1251         },
1252         {
1253                 .ctl_name       = FS_OVERFLOWGID,
1254                 .procname       = "overflowgid",
1255                 .data           = &fs_overflowgid,
1256                 .maxlen         = sizeof(int),
1257                 .mode           = 0644,
1258                 .proc_handler   = &proc_dointvec_minmax,
1259                 .strategy       = &sysctl_intvec,
1260                 .extra1         = &minolduid,
1261                 .extra2         = &maxolduid,
1262         },
1263         {
1264                 .ctl_name       = FS_LEASES,
1265                 .procname       = "leases-enable",
1266                 .data           = &leases_enable,
1267                 .maxlen         = sizeof(int),
1268                 .mode           = 0644,
1269                 .proc_handler   = &proc_dointvec,
1270         },
1271 #ifdef CONFIG_DNOTIFY
1272         {
1273                 .ctl_name       = FS_DIR_NOTIFY,
1274                 .procname       = "dir-notify-enable",
1275                 .data           = &dir_notify_enable,
1276                 .maxlen         = sizeof(int),
1277                 .mode           = 0644,
1278                 .proc_handler   = &proc_dointvec,
1279         },
1280 #endif
1281 #ifdef CONFIG_MMU
1282         {
1283                 .ctl_name       = FS_LEASE_TIME,
1284                 .procname       = "lease-break-time",
1285                 .data           = &lease_break_time,
1286                 .maxlen         = sizeof(int),
1287                 .mode           = 0644,
1288                 .proc_handler   = &proc_dointvec_minmax,
1289                 .strategy       = &sysctl_intvec,
1290                 .extra1         = &zero,
1291                 .extra2         = &two,
1292         },
1293         {
1294                 .procname       = "aio-nr",
1295                 .data           = &aio_nr,
1296                 .maxlen         = sizeof(aio_nr),
1297                 .mode           = 0444,
1298                 .proc_handler   = &proc_doulongvec_minmax,
1299         },
1300         {
1301                 .procname       = "aio-max-nr",
1302                 .data           = &aio_max_nr,
1303                 .maxlen         = sizeof(aio_max_nr),
1304                 .mode           = 0644,
1305                 .proc_handler   = &proc_doulongvec_minmax,
1306         },
1307 #ifdef CONFIG_INOTIFY_USER
1308         {
1309                 .ctl_name       = FS_INOTIFY,
1310                 .procname       = "inotify",
1311                 .mode           = 0555,
1312                 .child          = inotify_table,
1313         },
1314 #endif
1315 #endif
1316         {
1317                 .ctl_name       = KERN_SETUID_DUMPABLE,
1318                 .procname       = "suid_dumpable",
1319                 .data           = &suid_dumpable,
1320                 .maxlen         = sizeof(int),
1321                 .mode           = 0644,
1322                 .proc_handler   = &proc_dointvec,
1323         },
1324 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1325         {
1326                 .ctl_name       = CTL_UNNUMBERED,
1327                 .procname       = "binfmt_misc",
1328                 .mode           = 0555,
1329                 .child          = binfmt_misc_table,
1330         },
1331 #endif
1332 /*
1333  * NOTE: do not add new entries to this table unless you have read
1334  * Documentation/sysctl/ctl_unnumbered.txt
1335  */
1336         { .ctl_name = 0 }
1337 };
1338
1339 static struct ctl_table debug_table[] = {
1340 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1341         {
1342                 .ctl_name       = CTL_UNNUMBERED,
1343                 .procname       = "exception-trace",
1344                 .data           = &show_unhandled_signals,
1345                 .maxlen         = sizeof(int),
1346                 .mode           = 0644,
1347                 .proc_handler   = proc_dointvec
1348         },
1349 #endif
1350         { .ctl_name = 0 }
1351 };
1352
1353 static struct ctl_table dev_table[] = {
1354         { .ctl_name = 0 }
1355 };
1356
1357 static DEFINE_SPINLOCK(sysctl_lock);
1358
1359 /* called under sysctl_lock */
1360 static int use_table(struct ctl_table_header *p)
1361 {
1362         if (unlikely(p->unregistering))
1363                 return 0;
1364         p->used++;
1365         return 1;
1366 }
1367
1368 /* called under sysctl_lock */
1369 static void unuse_table(struct ctl_table_header *p)
1370 {
1371         if (!--p->used)
1372                 if (unlikely(p->unregistering))
1373                         complete(p->unregistering);
1374 }
1375
1376 /* called under sysctl_lock, will reacquire if has to wait */
1377 static void start_unregistering(struct ctl_table_header *p)
1378 {
1379         /*
1380          * if p->used is 0, nobody will ever touch that entry again;
1381          * we'll eliminate all paths to it before dropping sysctl_lock
1382          */
1383         if (unlikely(p->used)) {
1384                 struct completion wait;
1385                 init_completion(&wait);
1386                 p->unregistering = &wait;
1387                 spin_unlock(&sysctl_lock);
1388                 wait_for_completion(&wait);
1389                 spin_lock(&sysctl_lock);
1390         } else {
1391                 /* anything non-NULL; we'll never dereference it */
1392                 p->unregistering = ERR_PTR(-EINVAL);
1393         }
1394         /*
1395          * do not remove from the list until nobody holds it; walking the
1396          * list in do_sysctl() relies on that.
1397          */
1398         list_del_init(&p->ctl_entry);
1399 }
1400
1401 void sysctl_head_get(struct ctl_table_header *head)
1402 {
1403         spin_lock(&sysctl_lock);
1404         head->count++;
1405         spin_unlock(&sysctl_lock);
1406 }
1407
1408 void sysctl_head_put(struct ctl_table_header *head)
1409 {
1410         spin_lock(&sysctl_lock);
1411         if (!--head->count)
1412                 kfree(head);
1413         spin_unlock(&sysctl_lock);
1414 }
1415
1416 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1417 {
1418         if (!head)
1419                 BUG();
1420         spin_lock(&sysctl_lock);
1421         if (!use_table(head))
1422                 head = ERR_PTR(-ENOENT);
1423         spin_unlock(&sysctl_lock);
1424         return head;
1425 }
1426
1427 void sysctl_head_finish(struct ctl_table_header *head)
1428 {
1429         if (!head)
1430                 return;
1431         spin_lock(&sysctl_lock);
1432         unuse_table(head);
1433         spin_unlock(&sysctl_lock);
1434 }
1435
1436 static struct ctl_table_set *
1437 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1438 {
1439         struct ctl_table_set *set = &root->default_set;
1440         if (root->lookup)
1441                 set = root->lookup(root, namespaces);
1442         return set;
1443 }
1444
1445 static struct list_head *
1446 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1447 {
1448         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1449         return &set->list;
1450 }
1451
1452 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1453                                             struct ctl_table_header *prev)
1454 {
1455         struct ctl_table_root *root;
1456         struct list_head *header_list;
1457         struct ctl_table_header *head;
1458         struct list_head *tmp;
1459
1460         spin_lock(&sysctl_lock);
1461         if (prev) {
1462                 head = prev;
1463                 tmp = &prev->ctl_entry;
1464                 unuse_table(prev);
1465                 goto next;
1466         }
1467         tmp = &root_table_header.ctl_entry;
1468         for (;;) {
1469                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1470
1471                 if (!use_table(head))
1472                         goto next;
1473                 spin_unlock(&sysctl_lock);
1474                 return head;
1475         next:
1476                 root = head->root;
1477                 tmp = tmp->next;
1478                 header_list = lookup_header_list(root, namespaces);
1479                 if (tmp != header_list)
1480                         continue;
1481
1482                 do {
1483                         root = list_entry(root->root_list.next,
1484                                         struct ctl_table_root, root_list);
1485                         if (root == &sysctl_table_root)
1486                                 goto out;
1487                         header_list = lookup_header_list(root, namespaces);
1488                 } while (list_empty(header_list));
1489                 tmp = header_list->next;
1490         }
1491 out:
1492         spin_unlock(&sysctl_lock);
1493         return NULL;
1494 }
1495
1496 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1497 {
1498         return __sysctl_head_next(current->nsproxy, prev);
1499 }
1500
1501 void register_sysctl_root(struct ctl_table_root *root)
1502 {
1503         spin_lock(&sysctl_lock);
1504         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1505         spin_unlock(&sysctl_lock);
1506 }
1507
1508 #ifdef CONFIG_SYSCTL_SYSCALL
1509 /* Perform the actual read/write of a sysctl table entry. */
1510 static int do_sysctl_strategy(struct ctl_table_root *root,
1511                         struct ctl_table *table,
1512                         int __user *name, int nlen,
1513                         void __user *oldval, size_t __user *oldlenp,
1514                         void __user *newval, size_t newlen)
1515 {
1516         int op = 0, rc;
1517
1518         if (oldval)
1519                 op |= 004;
1520         if (newval)
1521                 op |= 002;
1522         if (sysctl_perm(root, table, op))
1523                 return -EPERM;
1524
1525         if (table->strategy) {
1526                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1527                                      newval, newlen);
1528                 if (rc < 0)
1529                         return rc;
1530                 if (rc > 0)
1531                         return 0;
1532         }
1533
1534         /* If there is no strategy routine, or if the strategy returns
1535          * zero, proceed with automatic r/w */
1536         if (table->data && table->maxlen) {
1537                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1538                                  newval, newlen);
1539                 if (rc < 0)
1540                         return rc;
1541         }
1542         return 0;
1543 }
1544
1545 static int parse_table(int __user *name, int nlen,
1546                        void __user *oldval, size_t __user *oldlenp,
1547                        void __user *newval, size_t newlen,
1548                        struct ctl_table_root *root,
1549                        struct ctl_table *table)
1550 {
1551         int n;
1552 repeat:
1553         if (!nlen)
1554                 return -ENOTDIR;
1555         if (get_user(n, name))
1556                 return -EFAULT;
1557         for ( ; table->ctl_name || table->procname; table++) {
1558                 if (!table->ctl_name)
1559                         continue;
1560                 if (n == table->ctl_name) {
1561                         int error;
1562                         if (table->child) {
1563                                 if (sysctl_perm(root, table, 001))
1564                                         return -EPERM;
1565                                 name++;
1566                                 nlen--;
1567                                 table = table->child;
1568                                 goto repeat;
1569                         }
1570                         error = do_sysctl_strategy(root, table, name, nlen,
1571                                                    oldval, oldlenp,
1572                                                    newval, newlen);
1573                         return error;
1574                 }
1575         }
1576         return -ENOTDIR;
1577 }
1578
1579 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1580                void __user *newval, size_t newlen)
1581 {
1582         struct ctl_table_header *head;
1583         int error = -ENOTDIR;
1584
1585         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1586                 return -ENOTDIR;
1587         if (oldval) {
1588                 int old_len;
1589                 if (!oldlenp || get_user(old_len, oldlenp))
1590                         return -EFAULT;
1591         }
1592
1593         for (head = sysctl_head_next(NULL); head;
1594                         head = sysctl_head_next(head)) {
1595                 error = parse_table(name, nlen, oldval, oldlenp,
1596                                         newval, newlen,
1597                                         head->root, head->ctl_table);
1598                 if (error != -ENOTDIR) {
1599                         sysctl_head_finish(head);
1600                         break;
1601                 }
1602         }
1603         return error;
1604 }
1605
1606 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1607 {
1608         struct __sysctl_args tmp;
1609         int error;
1610
1611         if (copy_from_user(&tmp, args, sizeof(tmp)))
1612                 return -EFAULT;
1613
1614         error = deprecated_sysctl_warning(&tmp);
1615         if (error)
1616                 goto out;
1617
1618         lock_kernel();
1619         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1620                           tmp.newval, tmp.newlen);
1621         unlock_kernel();
1622 out:
1623         return error;
1624 }
1625 #endif /* CONFIG_SYSCTL_SYSCALL */
1626
1627 /*
1628  * sysctl_perm does NOT grant the superuser all rights automatically, because
1629  * some sysctl variables are readonly even to root.
1630  */
1631
1632 static int test_perm(int mode, int op)
1633 {
1634         if (!current->euid)
1635                 mode >>= 6;
1636         else if (in_egroup_p(0))
1637                 mode >>= 3;
1638         if ((mode & op & 0007) == op)
1639                 return 0;
1640         return -EACCES;
1641 }
1642
1643 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1644 {
1645         int error;
1646         int mode;
1647
1648         error = security_sysctl(table, op);
1649         if (error)
1650                 return error;
1651
1652         if (root->permissions)
1653                 mode = root->permissions(root, current->nsproxy, table);
1654         else
1655                 mode = table->mode;
1656
1657         return test_perm(mode, op);
1658 }
1659
1660 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1661 {
1662         for (; table->ctl_name || table->procname; table++) {
1663                 table->parent = parent;
1664                 if (table->child)
1665                         sysctl_set_parent(table, table->child);
1666         }
1667 }
1668
1669 static __init int sysctl_init(void)
1670 {
1671         sysctl_set_parent(NULL, root_table);
1672 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1673         {
1674                 int err;
1675                 err = sysctl_check_table(current->nsproxy, root_table);
1676         }
1677 #endif
1678         return 0;
1679 }
1680
1681 core_initcall(sysctl_init);
1682
1683 /**
1684  * __register_sysctl_paths - register a sysctl hierarchy
1685  * @root: List of sysctl headers to register on
1686  * @namespaces: Data to compute which lists of sysctl entries are visible
1687  * @path: The path to the directory the sysctl table is in.
1688  * @table: the top-level table structure
1689  *
1690  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1691  * array. A completely 0 filled entry terminates the table.
1692  *
1693  * The members of the &struct ctl_table structure are used as follows:
1694  *
1695  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1696  *            must be unique within that level of sysctl
1697  *
1698  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1699  *            enter a sysctl file
1700  *
1701  * data - a pointer to data for use by proc_handler
1702  *
1703  * maxlen - the maximum size in bytes of the data
1704  *
1705  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1706  *
1707  * child - a pointer to the child sysctl table if this entry is a directory, or
1708  *         %NULL.
1709  *
1710  * proc_handler - the text handler routine (described below)
1711  *
1712  * strategy - the strategy routine (described below)
1713  *
1714  * de - for internal use by the sysctl routines
1715  *
1716  * extra1, extra2 - extra pointers usable by the proc handler routines
1717  *
1718  * Leaf nodes in the sysctl tree will be represented by a single file
1719  * under /proc; non-leaf nodes will be represented by directories.
1720  *
1721  * sysctl(2) can automatically manage read and write requests through
1722  * the sysctl table.  The data and maxlen fields of the ctl_table
1723  * struct enable minimal validation of the values being written to be
1724  * performed, and the mode field allows minimal authentication.
1725  *
1726  * More sophisticated management can be enabled by the provision of a
1727  * strategy routine with the table entry.  This will be called before
1728  * any automatic read or write of the data is performed.
1729  *
1730  * The strategy routine may return
1731  *
1732  * < 0 - Error occurred (error is passed to user process)
1733  *
1734  * 0   - OK - proceed with automatic read or write.
1735  *
1736  * > 0 - OK - read or write has been done by the strategy routine, so
1737  *       return immediately.
1738  *
1739  * There must be a proc_handler routine for any terminal nodes
1740  * mirrored under /proc/sys (non-terminals are handled by a built-in
1741  * directory handler).  Several default handlers are available to
1742  * cover common cases -
1743  *
1744  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1745  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1746  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1747  *
1748  * It is the handler's job to read the input buffer from user memory
1749  * and process it. The handler should return 0 on success.
1750  *
1751  * This routine returns %NULL on a failure to register, and a pointer
1752  * to the table header on success.
1753  */
1754 struct ctl_table_header *__register_sysctl_paths(
1755         struct ctl_table_root *root,
1756         struct nsproxy *namespaces,
1757         const struct ctl_path *path, struct ctl_table *table)
1758 {
1759         struct ctl_table_header *header;
1760         struct ctl_table *new, **prevp;
1761         unsigned int n, npath;
1762
1763         /* Count the path components */
1764         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1765                 ;
1766
1767         /*
1768          * For each path component, allocate a 2-element ctl_table array.
1769          * The first array element will be filled with the sysctl entry
1770          * for this, the second will be the sentinel (ctl_name == 0).
1771          *
1772          * We allocate everything in one go so that we don't have to
1773          * worry about freeing additional memory in unregister_sysctl_table.
1774          */
1775         header = kzalloc(sizeof(struct ctl_table_header) +
1776                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1777         if (!header)
1778                 return NULL;
1779
1780         new = (struct ctl_table *) (header + 1);
1781
1782         /* Now connect the dots */
1783         prevp = &header->ctl_table;
1784         for (n = 0; n < npath; ++n, ++path) {
1785                 /* Copy the procname */
1786                 new->procname = path->procname;
1787                 new->ctl_name = path->ctl_name;
1788                 new->mode     = 0555;
1789
1790                 *prevp = new;
1791                 prevp = &new->child;
1792
1793                 new += 2;
1794         }
1795         *prevp = table;
1796         header->ctl_table_arg = table;
1797
1798         INIT_LIST_HEAD(&header->ctl_entry);
1799         header->used = 0;
1800         header->unregistering = NULL;
1801         header->root = root;
1802         sysctl_set_parent(NULL, header->ctl_table);
1803         header->count = 1;
1804 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1805         if (sysctl_check_table(namespaces, header->ctl_table)) {
1806                 kfree(header);
1807                 return NULL;
1808         }
1809 #endif
1810         spin_lock(&sysctl_lock);
1811         header->set = lookup_header_set(root, namespaces);
1812         list_add_tail(&header->ctl_entry, &header->set->list);
1813         spin_unlock(&sysctl_lock);
1814
1815         return header;
1816 }
1817
1818 /**
1819  * register_sysctl_table_path - register a sysctl table hierarchy
1820  * @path: The path to the directory the sysctl table is in.
1821  * @table: the top-level table structure
1822  *
1823  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1824  * array. A completely 0 filled entry terminates the table.
1825  *
1826  * See __register_sysctl_paths for more details.
1827  */
1828 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1829                                                 struct ctl_table *table)
1830 {
1831         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1832                                         path, table);
1833 }
1834
1835 /**
1836  * register_sysctl_table - register a sysctl table hierarchy
1837  * @table: the top-level table structure
1838  *
1839  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1840  * array. A completely 0 filled entry terminates the table.
1841  *
1842  * See register_sysctl_paths for more details.
1843  */
1844 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1845 {
1846         static const struct ctl_path null_path[] = { {} };
1847
1848         return register_sysctl_paths(null_path, table);
1849 }
1850
1851 /**
1852  * unregister_sysctl_table - unregister a sysctl table hierarchy
1853  * @header: the header returned from register_sysctl_table
1854  *
1855  * Unregisters the sysctl table and all children. proc entries may not
1856  * actually be removed until they are no longer used by anyone.
1857  */
1858 void unregister_sysctl_table(struct ctl_table_header * header)
1859 {
1860         might_sleep();
1861
1862         if (header == NULL)
1863                 return;
1864
1865         spin_lock(&sysctl_lock);
1866         start_unregistering(header);
1867         if (!--header->count)
1868                 kfree(header);
1869         spin_unlock(&sysctl_lock);
1870 }
1871
1872 void setup_sysctl_set(struct ctl_table_set *p,
1873         struct ctl_table_set *parent,
1874         int (*is_seen)(struct ctl_table_set *))
1875 {
1876         INIT_LIST_HEAD(&p->list);
1877         p->parent = parent ? parent : &sysctl_table_root.default_set;
1878         p->is_seen = is_seen;
1879 }
1880
1881 #else /* !CONFIG_SYSCTL */
1882 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1883 {
1884         return NULL;
1885 }
1886
1887 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1888                                                     struct ctl_table *table)
1889 {
1890         return NULL;
1891 }
1892
1893 void unregister_sysctl_table(struct ctl_table_header * table)
1894 {
1895 }
1896
1897 void setup_sysctl_set(struct ctl_table_set *p,
1898         struct ctl_table_set *parent,
1899         int (*is_seen)(struct ctl_table_set *))
1900 {
1901 }
1902
1903 void sysctl_head_put(struct ctl_table_header *head)
1904 {
1905 }
1906
1907 #endif /* CONFIG_SYSCTL */
1908
1909 /*
1910  * /proc/sys support
1911  */
1912
1913 #ifdef CONFIG_PROC_SYSCTL
1914
1915 static int _proc_do_string(void* data, int maxlen, int write,
1916                            struct file *filp, void __user *buffer,
1917                            size_t *lenp, loff_t *ppos)
1918 {
1919         size_t len;
1920         char __user *p;
1921         char c;
1922
1923         if (!data || !maxlen || !*lenp) {
1924                 *lenp = 0;
1925                 return 0;
1926         }
1927
1928         if (write) {
1929                 len = 0;
1930                 p = buffer;
1931                 while (len < *lenp) {
1932                         if (get_user(c, p++))
1933                                 return -EFAULT;
1934                         if (c == 0 || c == '\n')
1935                                 break;
1936                         len++;
1937                 }
1938                 if (len >= maxlen)
1939                         len = maxlen-1;
1940                 if(copy_from_user(data, buffer, len))
1941                         return -EFAULT;
1942                 ((char *) data)[len] = 0;
1943                 *ppos += *lenp;
1944         } else {
1945                 len = strlen(data);
1946                 if (len > maxlen)
1947                         len = maxlen;
1948
1949                 if (*ppos > len) {
1950                         *lenp = 0;
1951                         return 0;
1952                 }
1953
1954                 data += *ppos;
1955                 len  -= *ppos;
1956
1957                 if (len > *lenp)
1958                         len = *lenp;
1959                 if (len)
1960                         if(copy_to_user(buffer, data, len))
1961                                 return -EFAULT;
1962                 if (len < *lenp) {
1963                         if(put_user('\n', ((char __user *) buffer) + len))
1964                                 return -EFAULT;
1965                         len++;
1966                 }
1967                 *lenp = len;
1968                 *ppos += len;
1969         }
1970         return 0;
1971 }
1972
1973 /**
1974  * proc_dostring - read a string sysctl
1975  * @table: the sysctl table
1976  * @write: %TRUE if this is a write to the sysctl file
1977  * @filp: the file structure
1978  * @buffer: the user buffer
1979  * @lenp: the size of the user buffer
1980  * @ppos: file position
1981  *
1982  * Reads/writes a string from/to the user buffer. If the kernel
1983  * buffer provided is not large enough to hold the string, the
1984  * string is truncated. The copied string is %NULL-terminated.
1985  * If the string is being read by the user process, it is copied
1986  * and a newline '\n' is added. It is truncated if the buffer is
1987  * not large enough.
1988  *
1989  * Returns 0 on success.
1990  */
1991 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1992                   void __user *buffer, size_t *lenp, loff_t *ppos)
1993 {
1994         return _proc_do_string(table->data, table->maxlen, write, filp,
1995                                buffer, lenp, ppos);
1996 }
1997
1998
1999 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2000                                  int *valp,
2001                                  int write, void *data)
2002 {
2003         if (write) {
2004                 *valp = *negp ? -*lvalp : *lvalp;
2005         } else {
2006                 int val = *valp;
2007                 if (val < 0) {
2008                         *negp = -1;
2009                         *lvalp = (unsigned long)-val;
2010                 } else {
2011                         *negp = 0;
2012                         *lvalp = (unsigned long)val;
2013                 }
2014         }
2015         return 0;
2016 }
2017
2018 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2019                   int write, struct file *filp, void __user *buffer,
2020                   size_t *lenp, loff_t *ppos,
2021                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2022                               int write, void *data),
2023                   void *data)
2024 {
2025 #define TMPBUFLEN 21
2026         int *i, vleft, first=1, neg, val;
2027         unsigned long lval;
2028         size_t left, len;
2029
2030         char buf[TMPBUFLEN], *p;
2031         char __user *s = buffer;
2032
2033         if (!tbl_data || !table->maxlen || !*lenp ||
2034             (*ppos && !write)) {
2035                 *lenp = 0;
2036                 return 0;
2037         }
2038
2039         i = (int *) tbl_data;
2040         vleft = table->maxlen / sizeof(*i);
2041         left = *lenp;
2042
2043         if (!conv)
2044                 conv = do_proc_dointvec_conv;
2045
2046         for (; left && vleft--; i++, first=0) {
2047                 if (write) {
2048                         while (left) {
2049                                 char c;
2050                                 if (get_user(c, s))
2051                                         return -EFAULT;
2052                                 if (!isspace(c))
2053                                         break;
2054                                 left--;
2055                                 s++;
2056                         }
2057                         if (!left)
2058                                 break;
2059                         neg = 0;
2060                         len = left;
2061                         if (len > sizeof(buf) - 1)
2062                                 len = sizeof(buf) - 1;
2063                         if (copy_from_user(buf, s, len))
2064                                 return -EFAULT;
2065                         buf[len] = 0;
2066                         p = buf;
2067                         if (*p == '-' && left > 1) {
2068                                 neg = 1;
2069                                 p++;
2070                         }
2071                         if (*p < '0' || *p > '9')
2072                                 break;
2073
2074                         lval = simple_strtoul(p, &p, 0);
2075
2076                         len = p-buf;
2077                         if ((len < left) && *p && !isspace(*p))
2078                                 break;
2079                         if (neg)
2080                                 val = -val;
2081                         s += len;
2082                         left -= len;
2083
2084                         if (conv(&neg, &lval, i, 1, data))
2085                                 break;
2086                 } else {
2087                         p = buf;
2088                         if (!first)
2089                                 *p++ = '\t';
2090
2091                         if (conv(&neg, &lval, i, 0, data))
2092                                 break;
2093
2094                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2095                         len = strlen(buf);
2096                         if (len > left)
2097                                 len = left;
2098                         if(copy_to_user(s, buf, len))
2099                                 return -EFAULT;
2100                         left -= len;
2101                         s += len;
2102                 }
2103         }
2104
2105         if (!write && !first && left) {
2106                 if(put_user('\n', s))
2107                         return -EFAULT;
2108                 left--, s++;
2109         }
2110         if (write) {
2111                 while (left) {
2112                         char c;
2113                         if (get_user(c, s++))
2114                                 return -EFAULT;
2115                         if (!isspace(c))
2116                                 break;
2117                         left--;
2118                 }
2119         }
2120         if (write && first)
2121                 return -EINVAL;
2122         *lenp -= left;
2123         *ppos += *lenp;
2124         return 0;
2125 #undef TMPBUFLEN
2126 }
2127
2128 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2129                   void __user *buffer, size_t *lenp, loff_t *ppos,
2130                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2131                               int write, void *data),
2132                   void *data)
2133 {
2134         return __do_proc_dointvec(table->data, table, write, filp,
2135                         buffer, lenp, ppos, conv, data);
2136 }
2137
2138 /**
2139  * proc_dointvec - read a vector of integers
2140  * @table: the sysctl table
2141  * @write: %TRUE if this is a write to the sysctl file
2142  * @filp: the file structure
2143  * @buffer: the user buffer
2144  * @lenp: the size of the user buffer
2145  * @ppos: file position
2146  *
2147  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2148  * values from/to the user buffer, treated as an ASCII string.
2149  *
2150  * Returns 0 on success.
2151  */
2152 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2153                      void __user *buffer, size_t *lenp, loff_t *ppos)
2154 {
2155     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2156                             NULL,NULL);
2157 }
2158
2159 #define OP_SET  0
2160 #define OP_AND  1
2161 #define OP_OR   2
2162
2163 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2164                                       int *valp,
2165                                       int write, void *data)
2166 {
2167         int op = *(int *)data;
2168         if (write) {
2169                 int val = *negp ? -*lvalp : *lvalp;
2170                 switch(op) {
2171                 case OP_SET:    *valp = val; break;
2172                 case OP_AND:    *valp &= val; break;
2173                 case OP_OR:     *valp |= val; break;
2174                 }
2175         } else {
2176                 int val = *valp;
2177                 if (val < 0) {
2178                         *negp = -1;
2179                         *lvalp = (unsigned long)-val;
2180                 } else {
2181                         *negp = 0;
2182                         *lvalp = (unsigned long)val;
2183                 }
2184         }
2185         return 0;
2186 }
2187
2188 /*
2189  *      Taint values can only be increased
2190  */
2191 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2192                                void __user *buffer, size_t *lenp, loff_t *ppos)
2193 {
2194         int op;
2195
2196         if (write && !capable(CAP_SYS_ADMIN))
2197                 return -EPERM;
2198
2199         op = OP_OR;
2200         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2201                                 do_proc_dointvec_bset_conv,&op);
2202 }
2203
2204 struct do_proc_dointvec_minmax_conv_param {
2205         int *min;
2206         int *max;
2207 };
2208
2209 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2210                                         int *valp,
2211                                         int write, void *data)
2212 {
2213         struct do_proc_dointvec_minmax_conv_param *param = data;
2214         if (write) {
2215                 int val = *negp ? -*lvalp : *lvalp;
2216                 if ((param->min && *param->min > val) ||
2217                     (param->max && *param->max < val))
2218                         return -EINVAL;
2219                 *valp = val;
2220         } else {
2221                 int val = *valp;
2222                 if (val < 0) {
2223                         *negp = -1;
2224                         *lvalp = (unsigned long)-val;
2225                 } else {
2226                         *negp = 0;
2227                         *lvalp = (unsigned long)val;
2228                 }
2229         }
2230         return 0;
2231 }
2232
2233 /**
2234  * proc_dointvec_minmax - read a vector of integers with min/max values
2235  * @table: the sysctl table
2236  * @write: %TRUE if this is a write to the sysctl file
2237  * @filp: the file structure
2238  * @buffer: the user buffer
2239  * @lenp: the size of the user buffer
2240  * @ppos: file position
2241  *
2242  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2243  * values from/to the user buffer, treated as an ASCII string.
2244  *
2245  * This routine will ensure the values are within the range specified by
2246  * table->extra1 (min) and table->extra2 (max).
2247  *
2248  * Returns 0 on success.
2249  */
2250 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2251                   void __user *buffer, size_t *lenp, loff_t *ppos)
2252 {
2253         struct do_proc_dointvec_minmax_conv_param param = {
2254                 .min = (int *) table->extra1,
2255                 .max = (int *) table->extra2,
2256         };
2257         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2258                                 do_proc_dointvec_minmax_conv, &param);
2259 }
2260
2261 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2262                                      struct file *filp,
2263                                      void __user *buffer,
2264                                      size_t *lenp, loff_t *ppos,
2265                                      unsigned long convmul,
2266                                      unsigned long convdiv)
2267 {
2268 #define TMPBUFLEN 21
2269         unsigned long *i, *min, *max, val;
2270         int vleft, first=1, neg;
2271         size_t len, left;
2272         char buf[TMPBUFLEN], *p;
2273         char __user *s = buffer;
2274
2275         if (!data || !table->maxlen || !*lenp ||
2276             (*ppos && !write)) {
2277                 *lenp = 0;
2278                 return 0;
2279         }
2280
2281         i = (unsigned long *) data;
2282         min = (unsigned long *) table->extra1;
2283         max = (unsigned long *) table->extra2;
2284         vleft = table->maxlen / sizeof(unsigned long);
2285         left = *lenp;
2286
2287         for (; left && vleft--; i++, min++, max++, first=0) {
2288                 if (write) {
2289                         while (left) {
2290                                 char c;
2291                                 if (get_user(c, s))
2292                                         return -EFAULT;
2293                                 if (!isspace(c))
2294                                         break;
2295                                 left--;
2296                                 s++;
2297                         }
2298                         if (!left)
2299                                 break;
2300                         neg = 0;
2301                         len = left;
2302                         if (len > TMPBUFLEN-1)
2303                                 len = TMPBUFLEN-1;
2304                         if (copy_from_user(buf, s, len))
2305                                 return -EFAULT;
2306                         buf[len] = 0;
2307                         p = buf;
2308                         if (*p == '-' && left > 1) {
2309                                 neg = 1;
2310                                 p++;
2311                         }
2312                         if (*p < '0' || *p > '9')
2313                                 break;
2314                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2315                         len = p-buf;
2316                         if ((len < left) && *p && !isspace(*p))
2317                                 break;
2318                         if (neg)
2319                                 val = -val;
2320                         s += len;
2321                         left -= len;
2322
2323                         if(neg)
2324                                 continue;
2325                         if ((min && val < *min) || (max && val > *max))
2326                                 continue;
2327                         *i = val;
2328                 } else {
2329                         p = buf;
2330                         if (!first)
2331                                 *p++ = '\t';
2332                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2333                         len = strlen(buf);
2334                         if (len > left)
2335                                 len = left;
2336                         if(copy_to_user(s, buf, len))
2337                                 return -EFAULT;
2338                         left -= len;
2339                         s += len;
2340                 }
2341         }
2342
2343         if (!write && !first && left) {
2344                 if(put_user('\n', s))
2345                         return -EFAULT;
2346                 left--, s++;
2347         }
2348         if (write) {
2349                 while (left) {
2350                         char c;
2351                         if (get_user(c, s++))
2352                                 return -EFAULT;
2353                         if (!isspace(c))
2354                                 break;
2355                         left--;
2356                 }
2357         }
2358         if (write && first)
2359                 return -EINVAL;
2360         *lenp -= left;
2361         *ppos += *lenp;
2362         return 0;
2363 #undef TMPBUFLEN
2364 }
2365
2366 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2367                                      struct file *filp,
2368                                      void __user *buffer,
2369                                      size_t *lenp, loff_t *ppos,
2370                                      unsigned long convmul,
2371                                      unsigned long convdiv)
2372 {
2373         return __do_proc_doulongvec_minmax(table->data, table, write,
2374                         filp, buffer, lenp, ppos, convmul, convdiv);
2375 }
2376
2377 /**
2378  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2379  * @table: the sysctl table
2380  * @write: %TRUE if this is a write to the sysctl file
2381  * @filp: the file structure
2382  * @buffer: the user buffer
2383  * @lenp: the size of the user buffer
2384  * @ppos: file position
2385  *
2386  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2387  * values from/to the user buffer, treated as an ASCII string.
2388  *
2389  * This routine will ensure the values are within the range specified by
2390  * table->extra1 (min) and table->extra2 (max).
2391  *
2392  * Returns 0 on success.
2393  */
2394 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2395                            void __user *buffer, size_t *lenp, loff_t *ppos)
2396 {
2397     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2398 }
2399
2400 /**
2401  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2402  * @table: the sysctl table
2403  * @write: %TRUE if this is a write to the sysctl file
2404  * @filp: the file structure
2405  * @buffer: the user buffer
2406  * @lenp: the size of the user buffer
2407  * @ppos: file position
2408  *
2409  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2410  * values from/to the user buffer, treated as an ASCII string. The values
2411  * are treated as milliseconds, and converted to jiffies when they are stored.
2412  *
2413  * This routine will ensure the values are within the range specified by
2414  * table->extra1 (min) and table->extra2 (max).
2415  *
2416  * Returns 0 on success.
2417  */
2418 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2419                                       struct file *filp,
2420                                       void __user *buffer,
2421                                       size_t *lenp, loff_t *ppos)
2422 {
2423     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2424                                      lenp, ppos, HZ, 1000l);
2425 }
2426
2427
2428 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2429                                          int *valp,
2430                                          int write, void *data)
2431 {
2432         if (write) {
2433                 if (*lvalp > LONG_MAX / HZ)
2434                         return 1;
2435                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2436         } else {
2437                 int val = *valp;
2438                 unsigned long lval;
2439                 if (val < 0) {
2440                         *negp = -1;
2441                         lval = (unsigned long)-val;
2442                 } else {
2443                         *negp = 0;
2444                         lval = (unsigned long)val;
2445                 }
2446                 *lvalp = lval / HZ;
2447         }
2448         return 0;
2449 }
2450
2451 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2452                                                 int *valp,
2453                                                 int write, void *data)
2454 {
2455         if (write) {
2456                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2457                         return 1;
2458                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2459         } else {
2460                 int val = *valp;
2461                 unsigned long lval;
2462                 if (val < 0) {
2463                         *negp = -1;
2464                         lval = (unsigned long)-val;
2465                 } else {
2466                         *negp = 0;
2467                         lval = (unsigned long)val;
2468                 }
2469                 *lvalp = jiffies_to_clock_t(lval);
2470         }
2471         return 0;
2472 }
2473
2474 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2475                                             int *valp,
2476                                             int write, void *data)
2477 {
2478         if (write) {
2479                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2480         } else {
2481                 int val = *valp;
2482                 unsigned long lval;
2483                 if (val < 0) {
2484                         *negp = -1;
2485                         lval = (unsigned long)-val;
2486                 } else {
2487                         *negp = 0;
2488                         lval = (unsigned long)val;
2489                 }
2490                 *lvalp = jiffies_to_msecs(lval);
2491         }
2492         return 0;
2493 }
2494
2495 /**
2496  * proc_dointvec_jiffies - read a vector of integers as seconds
2497  * @table: the sysctl table
2498  * @write: %TRUE if this is a write to the sysctl file
2499  * @filp: the file structure
2500  * @buffer: the user buffer
2501  * @lenp: the size of the user buffer
2502  * @ppos: file position
2503  *
2504  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2505  * values from/to the user buffer, treated as an ASCII string.
2506  * The values read are assumed to be in seconds, and are converted into
2507  * jiffies.
2508  *
2509  * Returns 0 on success.
2510  */
2511 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2512                           void __user *buffer, size_t *lenp, loff_t *ppos)
2513 {
2514     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2515                             do_proc_dointvec_jiffies_conv,NULL);
2516 }
2517
2518 /**
2519  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2520  * @table: the sysctl table
2521  * @write: %TRUE if this is a write to the sysctl file
2522  * @filp: the file structure
2523  * @buffer: the user buffer
2524  * @lenp: the size of the user buffer
2525  * @ppos: pointer to the file position
2526  *
2527  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2528  * values from/to the user buffer, treated as an ASCII string.
2529  * The values read are assumed to be in 1/USER_HZ seconds, and
2530  * are converted into jiffies.
2531  *
2532  * Returns 0 on success.
2533  */
2534 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2535                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2536 {
2537     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2538                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2539 }
2540
2541 /**
2542  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2543  * @table: the sysctl table
2544  * @write: %TRUE if this is a write to the sysctl file
2545  * @filp: the file structure
2546  * @buffer: the user buffer
2547  * @lenp: the size of the user buffer
2548  * @ppos: file position
2549  * @ppos: the current position in the file
2550  *
2551  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2552  * values from/to the user buffer, treated as an ASCII string.
2553  * The values read are assumed to be in 1/1000 seconds, and
2554  * are converted into jiffies.
2555  *
2556  * Returns 0 on success.
2557  */
2558 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2559                              void __user *buffer, size_t *lenp, loff_t *ppos)
2560 {
2561         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2562                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2563 }
2564
2565 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2566                            void __user *buffer, size_t *lenp, loff_t *ppos)
2567 {
2568         struct pid *new_pid;
2569         pid_t tmp;
2570         int r;
2571
2572         tmp = pid_vnr(cad_pid);
2573
2574         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2575                                lenp, ppos, NULL, NULL);
2576         if (r || !write)
2577                 return r;
2578
2579         new_pid = find_get_pid(tmp);
2580         if (!new_pid)
2581                 return -ESRCH;
2582
2583         put_pid(xchg(&cad_pid, new_pid));
2584         return 0;
2585 }
2586
2587 #else /* CONFIG_PROC_FS */
2588
2589 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2590                   void __user *buffer, size_t *lenp, loff_t *ppos)
2591 {
2592         return -ENOSYS;
2593 }
2594
2595 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2596                   void __user *buffer, size_t *lenp, loff_t *ppos)
2597 {
2598         return -ENOSYS;
2599 }
2600
2601 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2602                     void __user *buffer, size_t *lenp, loff_t *ppos)
2603 {
2604         return -ENOSYS;
2605 }
2606
2607 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2608                     void __user *buffer, size_t *lenp, loff_t *ppos)
2609 {
2610         return -ENOSYS;
2611 }
2612
2613 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2614                     void __user *buffer, size_t *lenp, loff_t *ppos)
2615 {
2616         return -ENOSYS;
2617 }
2618
2619 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2620                              void __user *buffer, size_t *lenp, loff_t *ppos)
2621 {
2622         return -ENOSYS;
2623 }
2624
2625 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2626                     void __user *buffer, size_t *lenp, loff_t *ppos)
2627 {
2628         return -ENOSYS;
2629 }
2630
2631 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2632                                       struct file *filp,
2633                                       void __user *buffer,
2634                                       size_t *lenp, loff_t *ppos)
2635 {
2636     return -ENOSYS;
2637 }
2638
2639
2640 #endif /* CONFIG_PROC_FS */
2641
2642
2643 #ifdef CONFIG_SYSCTL_SYSCALL
2644 /*
2645  * General sysctl support routines
2646  */
2647
2648 /* The generic sysctl data routine (used if no strategy routine supplied) */
2649 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2650                 void __user *oldval, size_t __user *oldlenp,
2651                 void __user *newval, size_t newlen)
2652 {
2653         size_t len;
2654
2655         /* Get out of I don't have a variable */
2656         if (!table->data || !table->maxlen)
2657                 return -ENOTDIR;
2658
2659         if (oldval && oldlenp) {
2660                 if (get_user(len, oldlenp))
2661                         return -EFAULT;
2662                 if (len) {
2663                         if (len > table->maxlen)
2664                                 len = table->maxlen;
2665                         if (copy_to_user(oldval, table->data, len))
2666                                 return -EFAULT;
2667                         if (put_user(len, oldlenp))
2668                                 return -EFAULT;
2669                 }
2670         }
2671
2672         if (newval && newlen) {
2673                 if (newlen > table->maxlen)
2674                         newlen = table->maxlen;
2675
2676                 if (copy_from_user(table->data, newval, newlen))
2677                         return -EFAULT;
2678         }
2679         return 1;
2680 }
2681
2682 /* The generic string strategy routine: */
2683 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2684                   void __user *oldval, size_t __user *oldlenp,
2685                   void __user *newval, size_t newlen)
2686 {
2687         if (!table->data || !table->maxlen)
2688                 return -ENOTDIR;
2689
2690         if (oldval && oldlenp) {
2691                 size_t bufsize;
2692                 if (get_user(bufsize, oldlenp))
2693                         return -EFAULT;
2694                 if (bufsize) {
2695                         size_t len = strlen(table->data), copied;
2696
2697                         /* This shouldn't trigger for a well-formed sysctl */
2698                         if (len > table->maxlen)
2699                                 len = table->maxlen;
2700
2701                         /* Copy up to a max of bufsize-1 bytes of the string */
2702                         copied = (len >= bufsize) ? bufsize - 1 : len;
2703
2704                         if (copy_to_user(oldval, table->data, copied) ||
2705                             put_user(0, (char __user *)(oldval + copied)))
2706                                 return -EFAULT;
2707                         if (put_user(len, oldlenp))
2708                                 return -EFAULT;
2709                 }
2710         }
2711         if (newval && newlen) {
2712                 size_t len = newlen;
2713                 if (len > table->maxlen)
2714                         len = table->maxlen;
2715                 if(copy_from_user(table->data, newval, len))
2716                         return -EFAULT;
2717                 if (len == table->maxlen)
2718                         len--;
2719                 ((char *) table->data)[len] = 0;
2720         }
2721         return 1;
2722 }
2723
2724 /*
2725  * This function makes sure that all of the integers in the vector
2726  * are between the minimum and maximum values given in the arrays
2727  * table->extra1 and table->extra2, respectively.
2728  */
2729 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2730                 void __user *oldval, size_t __user *oldlenp,
2731                 void __user *newval, size_t newlen)
2732 {
2733
2734         if (newval && newlen) {
2735                 int __user *vec = (int __user *) newval;
2736                 int *min = (int *) table->extra1;
2737                 int *max = (int *) table->extra2;
2738                 size_t length;
2739                 int i;
2740
2741                 if (newlen % sizeof(int) != 0)
2742                         return -EINVAL;
2743
2744                 if (!table->extra1 && !table->extra2)
2745                         return 0;
2746
2747                 if (newlen > table->maxlen)
2748                         newlen = table->maxlen;
2749                 length = newlen / sizeof(int);
2750
2751                 for (i = 0; i < length; i++) {
2752                         int value;
2753                         if (get_user(value, vec + i))
2754                                 return -EFAULT;
2755                         if (min && value < min[i])
2756                                 return -EINVAL;
2757                         if (max && value > max[i])
2758                                 return -EINVAL;
2759                 }
2760         }
2761         return 0;
2762 }
2763
2764 /* Strategy function to convert jiffies to seconds */
2765 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2766                 void __user *oldval, size_t __user *oldlenp,
2767                 void __user *newval, size_t newlen)
2768 {
2769         if (oldval && oldlenp) {
2770                 size_t olen;
2771
2772                 if (get_user(olen, oldlenp))
2773                         return -EFAULT;
2774                 if (olen) {
2775                         int val;
2776
2777                         if (olen < sizeof(int))
2778                                 return -EINVAL;
2779
2780                         val = *(int *)(table->data) / HZ;
2781                         if (put_user(val, (int __user *)oldval))
2782                                 return -EFAULT;
2783                         if (put_user(sizeof(int), oldlenp))
2784                                 return -EFAULT;
2785                 }
2786         }
2787         if (newval && newlen) {
2788                 int new;
2789                 if (newlen != sizeof(int))
2790                         return -EINVAL;
2791                 if (get_user(new, (int __user *)newval))
2792                         return -EFAULT;
2793                 *(int *)(table->data) = new*HZ;
2794         }
2795         return 1;
2796 }
2797
2798 /* Strategy function to convert jiffies to seconds */
2799 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2800                 void __user *oldval, size_t __user *oldlenp,
2801                 void __user *newval, size_t newlen)
2802 {
2803         if (oldval && oldlenp) {
2804                 size_t olen;
2805
2806                 if (get_user(olen, oldlenp))
2807                         return -EFAULT;
2808                 if (olen) {
2809                         int val;
2810
2811                         if (olen < sizeof(int))
2812                                 return -EINVAL;
2813
2814                         val = jiffies_to_msecs(*(int *)(table->data));
2815                         if (put_user(val, (int __user *)oldval))
2816                                 return -EFAULT;
2817                         if (put_user(sizeof(int), oldlenp))
2818                                 return -EFAULT;
2819                 }
2820         }
2821         if (newval && newlen) {
2822                 int new;
2823                 if (newlen != sizeof(int))
2824                         return -EINVAL;
2825                 if (get_user(new, (int __user *)newval))
2826                         return -EFAULT;
2827                 *(int *)(table->data) = msecs_to_jiffies(new);
2828         }
2829         return 1;
2830 }
2831
2832
2833
2834 #else /* CONFIG_SYSCTL_SYSCALL */
2835
2836
2837 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2838 {
2839         struct __sysctl_args tmp;
2840         int error;
2841
2842         if (copy_from_user(&tmp, args, sizeof(tmp)))
2843                 return -EFAULT;
2844
2845         error = deprecated_sysctl_warning(&tmp);
2846
2847         /* If no error reading the parameters then just -ENOSYS ... */
2848         if (!error)
2849                 error = -ENOSYS;
2850
2851         return error;
2852 }
2853
2854 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2855                   void __user *oldval, size_t __user *oldlenp,
2856                   void __user *newval, size_t newlen)
2857 {
2858         return -ENOSYS;
2859 }
2860
2861 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2862                   void __user *oldval, size_t __user *oldlenp,
2863                   void __user *newval, size_t newlen)
2864 {
2865         return -ENOSYS;
2866 }
2867
2868 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2869                 void __user *oldval, size_t __user *oldlenp,
2870                 void __user *newval, size_t newlen)
2871 {
2872         return -ENOSYS;
2873 }
2874
2875 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2876                 void __user *oldval, size_t __user *oldlenp,
2877                 void __user *newval, size_t newlen)
2878 {
2879         return -ENOSYS;
2880 }
2881
2882 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2883                 void __user *oldval, size_t __user *oldlenp,
2884                 void __user *newval, size_t newlen)
2885 {
2886         return -ENOSYS;
2887 }
2888
2889 #endif /* CONFIG_SYSCTL_SYSCALL */
2890
2891 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2892 {
2893         static int msg_count;
2894         int name[CTL_MAXNAME];
2895         int i;
2896
2897         /* Check args->nlen. */
2898         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2899                 return -ENOTDIR;
2900
2901         /* Read in the sysctl name for better debug message logging */
2902         for (i = 0; i < args->nlen; i++)
2903                 if (get_user(name[i], args->name + i))
2904                         return -EFAULT;
2905
2906         /* Ignore accesses to kernel.version */
2907         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2908                 return 0;
2909
2910         if (msg_count < 5) {
2911                 msg_count++;
2912                 printk(KERN_INFO
2913                         "warning: process `%s' used the deprecated sysctl "
2914                         "system call with ", current->comm);
2915                 for (i = 0; i < args->nlen; i++)
2916                         printk("%d.", name[i]);
2917                 printk("\n");
2918         }
2919         return 0;
2920 }
2921
2922 /*
2923  * No sense putting this after each symbol definition, twice,
2924  * exception granted :-)
2925  */
2926 EXPORT_SYMBOL(proc_dointvec);
2927 EXPORT_SYMBOL(proc_dointvec_jiffies);
2928 EXPORT_SYMBOL(proc_dointvec_minmax);
2929 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2930 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2931 EXPORT_SYMBOL(proc_dostring);
2932 EXPORT_SYMBOL(proc_doulongvec_minmax);
2933 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2934 EXPORT_SYMBOL(register_sysctl_table);
2935 EXPORT_SYMBOL(register_sysctl_paths);
2936 EXPORT_SYMBOL(sysctl_intvec);
2937 EXPORT_SYMBOL(sysctl_jiffies);
2938 EXPORT_SYMBOL(sysctl_ms_jiffies);
2939 EXPORT_SYMBOL(sysctl_string);
2940 EXPORT_SYMBOL(sysctl_data);
2941 EXPORT_SYMBOL(unregister_sysctl_table);