kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/key.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49 #include <linux/ftrace.h>
  50
  51 #include <asm/uaccess.h>
  52 #include <asm/processor.h>
  53
  54 #ifdef CONFIG_X86
  55 #include <asm/nmi.h>
  56 #include <asm/stacktrace.h>
  57 #include <asm/io.h>
  58 #endif
  59
  60 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  61
  62 #if defined(CONFIG_SYSCTL)
  63
  64 /* External variables not in a header file. */
  65 extern int C_A_D;
  66 extern int print_fatal_signals;
  67 extern int sysctl_overcommit_memory;
  68 extern int sysctl_overcommit_ratio;
  69 extern int sysctl_panic_on_oom;
  70 extern int sysctl_oom_kill_allocating_task;
  71 extern int sysctl_oom_dump_tasks;
  72 extern int max_threads;
  73 extern int core_uses_pid;
  74 extern int suid_dumpable;
  75 extern char core_pattern[];
  76 extern int pid_max;
  77 extern int min_free_kbytes;
  78 extern int pid_max_min, pid_max_max;
  79 extern int sysctl_drop_caches;
  80 extern int percpu_pagelist_fraction;
  81 extern int compat_log;
  82 extern int maps_protect;
  83 extern int sysctl_stat_interval;
  84 extern int latencytop_enabled;
  85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  86 #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_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
  92 static int one = 1;
  93 #endif
  94
  95 #ifdef CONFIG_DETECT_SOFTLOCKUP
  96 static int sixty = 60;
  97 #endif
  98
  99 #ifdef CONFIG_MMU
 100 static int two = 2;
 101 #endif
 102
 103 static int zero;
 104 static int one_hundred = 100;
 105
 106 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 107 static int maxolduid = 65535;
 108 static int minolduid;
 109 static int min_percpu_pagelist_fract = 8;
 110
 111 static int ngroups_max = NGROUPS_MAX;
 112
 113 #ifdef CONFIG_MODULES
 114 extern char modprobe_path[];
 115 #endif
 116 #ifdef CONFIG_CHR_DEV_SG
 117 extern int sg_big_buff;
 118 #endif
 119
 120 #ifdef __sparc__
 121 extern char reboot_command [];
 122 extern int stop_a_enabled;
 123 extern int scons_pwroff;
 124 #endif
 125
 126 #ifdef __hppa__
 127 extern int pwrsw_enabled;
 128 extern int unaligned_enabled;
 129 #endif
 130
 131 #ifdef CONFIG_S390
 132 #ifdef CONFIG_MATHEMU
 133 extern int sysctl_ieee_emulation_warnings;
 134 #endif
 135 extern int sysctl_userprocess_debug;
 136 extern int spin_retry;
 137 #endif
 138
 139 #ifdef CONFIG_BSD_PROCESS_ACCT
 140 extern int acct_parm[];
 141 #endif
 142
 143 #ifdef CONFIG_IA64
 144 extern int no_unaligned_warning;
 145 #endif
 146
 147 #ifdef CONFIG_RT_MUTEXES
 148 extern int max_lock_depth;
 149 #endif
 150
 151 #ifdef CONFIG_PROC_SYSCTL
 152 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 153                   void __user *buffer, size_t *lenp, loff_t *ppos);
 154 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 155                                void __user *buffer, size_t *lenp, loff_t *ppos);
 156 #endif
 157
 158 static struct ctl_table root_table[];
 159 static struct ctl_table_root sysctl_table_root;
 160 static struct ctl_table_header root_table_header = {
 161         .ctl_table = root_table,
 162         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 163         .root = &sysctl_table_root,
 164 };
 165 static struct ctl_table_root sysctl_table_root = {
 166         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 167         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 168 };
 169
 170 static struct ctl_table kern_table[];
 171 static struct ctl_table vm_table[];
 172 static struct ctl_table fs_table[];
 173 static struct ctl_table debug_table[];
 174 static struct ctl_table dev_table[];
 175 extern struct ctl_table random_table[];
 176 #ifdef CONFIG_INOTIFY_USER
 177 extern struct ctl_table inotify_table[];
 178 #endif
 179
 180 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 181 int sysctl_legacy_va_layout;
 182 #endif
 183
 184 extern int prove_locking;
 185 extern int lock_stat;
 186
 187 /* The default sysctl tables: */
 188
 189 static struct ctl_table root_table[] = {
 190         {
 191                 .ctl_name       = CTL_KERN,
 192                 .procname       = "kernel",
 193                 .mode           = 0555,
 194                 .child          = kern_table,
 195         },
 196         {
 197                 .ctl_name       = CTL_VM,
 198                 .procname       = "vm",
 199                 .mode           = 0555,
 200                 .child          = vm_table,
 201         },
 202         {
 203                 .ctl_name       = CTL_FS,
 204                 .procname       = "fs",
 205                 .mode           = 0555,
 206                 .child          = fs_table,
 207         },
 208         {
 209                 .ctl_name       = CTL_DEBUG,
 210                 .procname       = "debug",
 211                 .mode           = 0555,
 212                 .child          = debug_table,
 213         },
 214         {
 215                 .ctl_name       = CTL_DEV,
 216                 .procname       = "dev",
 217                 .mode           = 0555,
 218                 .child          = dev_table,
 219         },
 220 /*
 221  * NOTE: do not add new entries to this table unless you have read
 222  * Documentation/sysctl/ctl_unnumbered.txt
 223  */
 224         { .ctl_name = 0 }
 225 };
 226
 227 #ifdef CONFIG_SCHED_DEBUG
 228 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 229 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 230 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 231 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 232 #endif
 233
 234 static struct ctl_table kern_table[] = {
 235 #ifdef CONFIG_SCHED_DEBUG
 236         {
 237                 .ctl_name       = CTL_UNNUMBERED,
 238                 .procname       = "sched_min_granularity_ns",
 239                 .data           = &sysctl_sched_min_granularity,
 240                 .maxlen         = sizeof(unsigned int),
 241                 .mode           = 0644,
 242                 .proc_handler   = &sched_nr_latency_handler,
 243                 .strategy       = &sysctl_intvec,
 244                 .extra1         = &min_sched_granularity_ns,
 245                 .extra2         = &max_sched_granularity_ns,
 246         },
 247         {
 248                 .ctl_name       = CTL_UNNUMBERED,
 249                 .procname       = "sched_latency_ns",
 250                 .data           = &sysctl_sched_latency,
 251                 .maxlen         = sizeof(unsigned int),
 252                 .mode           = 0644,
 253                 .proc_handler   = &sched_nr_latency_handler,
 254                 .strategy       = &sysctl_intvec,
 255                 .extra1         = &min_sched_granularity_ns,
 256                 .extra2         = &max_sched_granularity_ns,
 257         },
 258         {
 259                 .ctl_name       = CTL_UNNUMBERED,
 260                 .procname       = "sched_wakeup_granularity_ns",
 261                 .data           = &sysctl_sched_wakeup_granularity,
 262                 .maxlen         = sizeof(unsigned int),
 263                 .mode           = 0644,
 264                 .proc_handler   = &proc_dointvec_minmax,
 265                 .strategy       = &sysctl_intvec,
 266                 .extra1         = &min_wakeup_granularity_ns,
 267                 .extra2         = &max_wakeup_granularity_ns,
 268         },
 269         {
 270                 .ctl_name       = CTL_UNNUMBERED,
 271                 .procname       = "sched_shares_ratelimit",
 272                 .data           = &sysctl_sched_shares_ratelimit,
 273                 .maxlen         = sizeof(unsigned int),
 274                 .mode           = 0644,
 275                 .proc_handler   = &proc_dointvec,
 276         },
 277         {
 278                 .ctl_name       = CTL_UNNUMBERED,
 279                 .procname       = "sched_child_runs_first",
 280                 .data           = &sysctl_sched_child_runs_first,
 281                 .maxlen         = sizeof(unsigned int),
 282                 .mode           = 0644,
 283                 .proc_handler   = &proc_dointvec,
 284         },
 285         {
 286                 .ctl_name       = CTL_UNNUMBERED,
 287                 .procname       = "sched_features",
 288                 .data           = &sysctl_sched_features,
 289                 .maxlen         = sizeof(unsigned int),
 290                 .mode           = 0644,
 291                 .proc_handler   = &proc_dointvec,
 292         },
 293         {
 294                 .ctl_name       = CTL_UNNUMBERED,
 295                 .procname       = "sched_migration_cost",
 296                 .data           = &sysctl_sched_migration_cost,
 297                 .maxlen         = sizeof(unsigned int),
 298                 .mode           = 0644,
 299                 .proc_handler   = &proc_dointvec,
 300         },
 301         {
 302                 .ctl_name       = CTL_UNNUMBERED,
 303                 .procname       = "sched_nr_migrate",
 304                 .data           = &sysctl_sched_nr_migrate,
 305                 .maxlen         = sizeof(unsigned int),
 306                 .mode           = 0644,
 307                 .proc_handler   = &proc_dointvec,
 308         },
 309 #endif
 310         {
 311                 .ctl_name       = CTL_UNNUMBERED,
 312                 .procname       = "sched_rt_period_us",
 313                 .data           = &sysctl_sched_rt_period,
 314                 .maxlen         = sizeof(unsigned int),
 315                 .mode           = 0644,
 316                 .proc_handler   = &sched_rt_handler,
 317         },
 318         {
 319                 .ctl_name       = CTL_UNNUMBERED,
 320                 .procname       = "sched_rt_runtime_us",
 321                 .data           = &sysctl_sched_rt_runtime,
 322                 .maxlen         = sizeof(int),
 323                 .mode           = 0644,
 324                 .proc_handler   = &sched_rt_handler,
 325         },
 326         {
 327                 .ctl_name       = CTL_UNNUMBERED,
 328                 .procname       = "sched_compat_yield",
 329                 .data           = &sysctl_sched_compat_yield,
 330                 .maxlen         = sizeof(unsigned int),
 331                 .mode           = 0644,
 332                 .proc_handler   = &proc_dointvec,
 333         },
 334 #ifdef CONFIG_PROVE_LOCKING
 335         {
 336                 .ctl_name       = CTL_UNNUMBERED,
 337                 .procname       = "prove_locking",
 338                 .data           = &prove_locking,
 339                 .maxlen         = sizeof(int),
 340                 .mode           = 0644,
 341                 .proc_handler   = &proc_dointvec,
 342         },
 343 #endif
 344 #ifdef CONFIG_LOCK_STAT
 345         {
 346                 .ctl_name       = CTL_UNNUMBERED,
 347                 .procname       = "lock_stat",
 348                 .data           = &lock_stat,
 349                 .maxlen         = sizeof(int),
 350                 .mode           = 0644,
 351                 .proc_handler   = &proc_dointvec,
 352         },
 353 #endif
 354         {
 355                 .ctl_name       = KERN_PANIC,
 356                 .procname       = "panic",
 357                 .data           = &panic_timeout,
 358                 .maxlen         = sizeof(int),
 359                 .mode           = 0644,
 360                 .proc_handler   = &proc_dointvec,
 361         },
 362         {
 363                 .ctl_name       = KERN_CORE_USES_PID,
 364                 .procname       = "core_uses_pid",
 365                 .data           = &core_uses_pid,
 366                 .maxlen         = sizeof(int),
 367                 .mode           = 0644,
 368                 .proc_handler   = &proc_dointvec,
 369         },
 370         {
 371                 .ctl_name       = KERN_CORE_PATTERN,
 372                 .procname       = "core_pattern",
 373                 .data           = core_pattern,
 374                 .maxlen         = CORENAME_MAX_SIZE,
 375                 .mode           = 0644,
 376                 .proc_handler   = &proc_dostring,
 377                 .strategy       = &sysctl_string,
 378         },
 379 #ifdef CONFIG_PROC_SYSCTL
 380         {
 381                 .procname       = "tainted",
 382                 .data           = &tainted,
 383                 .maxlen         = sizeof(int),
 384                 .mode           = 0644,
 385                 .proc_handler   = &proc_dointvec_taint,
 386         },
 387 #endif
 388 #ifdef CONFIG_LATENCYTOP
 389         {
 390                 .procname       = "latencytop",
 391                 .data           = &latencytop_enabled,
 392                 .maxlen         = sizeof(int),
 393                 .mode           = 0644,
 394                 .proc_handler   = &proc_dointvec,
 395         },
 396 #endif
 397 #ifdef CONFIG_BLK_DEV_INITRD
 398         {
 399                 .ctl_name       = KERN_REALROOTDEV,
 400                 .procname       = "real-root-dev",
 401                 .data           = &real_root_dev,
 402                 .maxlen         = sizeof(int),
 403                 .mode           = 0644,
 404                 .proc_handler   = &proc_dointvec,
 405         },
 406 #endif
 407         {
 408                 .ctl_name       = CTL_UNNUMBERED,
 409                 .procname       = "print-fatal-signals",
 410                 .data           = &print_fatal_signals,
 411                 .maxlen         = sizeof(int),
 412                 .mode           = 0644,
 413                 .proc_handler   = &proc_dointvec,
 414         },
 415 #ifdef __sparc__
 416         {
 417                 .ctl_name       = KERN_SPARC_REBOOT,
 418                 .procname       = "reboot-cmd",
 419                 .data           = reboot_command,
 420                 .maxlen         = 256,
 421                 .mode           = 0644,
 422                 .proc_handler   = &proc_dostring,
 423                 .strategy       = &sysctl_string,
 424         },
 425         {
 426                 .ctl_name       = KERN_SPARC_STOP_A,
 427                 .procname       = "stop-a",
 428                 .data           = &stop_a_enabled,
 429                 .maxlen         = sizeof (int),
 430                 .mode           = 0644,
 431                 .proc_handler   = &proc_dointvec,
 432         },
 433         {
 434                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 435                 .procname       = "scons-poweroff",
 436                 .data           = &scons_pwroff,
 437                 .maxlen         = sizeof (int),
 438                 .mode           = 0644,
 439                 .proc_handler   = &proc_dointvec,
 440         },
 441 #endif
 442 #ifdef __hppa__
 443         {
 444                 .ctl_name       = KERN_HPPA_PWRSW,
 445                 .procname       = "soft-power",
 446                 .data           = &pwrsw_enabled,
 447                 .maxlen         = sizeof (int),
 448                 .mode           = 0644,
 449                 .proc_handler   = &proc_dointvec,
 450         },
 451         {
 452                 .ctl_name       = KERN_HPPA_UNALIGNED,
 453                 .procname       = "unaligned-trap",
 454                 .data           = &unaligned_enabled,
 455                 .maxlen         = sizeof (int),
 456                 .mode           = 0644,
 457                 .proc_handler   = &proc_dointvec,
 458         },
 459 #endif
 460         {
 461                 .ctl_name       = KERN_CTLALTDEL,
 462                 .procname       = "ctrl-alt-del",
 463                 .data           = &C_A_D,
 464                 .maxlen         = sizeof(int),
 465                 .mode           = 0644,
 466                 .proc_handler   = &proc_dointvec,
 467         },
 468 #ifdef CONFIG_FTRACE
 469         {
 470                 .ctl_name       = CTL_UNNUMBERED,
 471                 .procname       = "ftrace_enabled",
 472                 .data           = &ftrace_enabled,
 473                 .maxlen         = sizeof(int),
 474                 .mode           = 0644,
 475                 .proc_handler   = &ftrace_enable_sysctl,
 476         },
 477 #endif
 478 #ifdef CONFIG_MODULES
 479         {
 480                 .ctl_name       = KERN_MODPROBE,
 481                 .procname       = "modprobe",
 482                 .data           = &modprobe_path,
 483                 .maxlen         = KMOD_PATH_LEN,
 484                 .mode           = 0644,
 485                 .proc_handler   = &proc_dostring,
 486                 .strategy       = &sysctl_string,
 487         },
 488 #endif
 489 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 490         {
 491                 .ctl_name       = KERN_HOTPLUG,
 492                 .procname       = "hotplug",
 493                 .data           = &uevent_helper,
 494                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 495                 .mode           = 0644,
 496                 .proc_handler   = &proc_dostring,
 497                 .strategy       = &sysctl_string,
 498         },
 499 #endif
 500 #ifdef CONFIG_CHR_DEV_SG
 501         {
 502                 .ctl_name       = KERN_SG_BIG_BUFF,
 503                 .procname       = "sg-big-buff",
 504                 .data           = &sg_big_buff,
 505                 .maxlen         = sizeof (int),
 506                 .mode           = 0444,
 507                 .proc_handler   = &proc_dointvec,
 508         },
 509 #endif
 510 #ifdef CONFIG_BSD_PROCESS_ACCT
 511         {
 512                 .ctl_name       = KERN_ACCT,
 513                 .procname       = "acct",
 514                 .data           = &acct_parm,
 515                 .maxlen         = 3*sizeof(int),
 516                 .mode           = 0644,
 517                 .proc_handler   = &proc_dointvec,
 518         },
 519 #endif
 520 #ifdef CONFIG_MAGIC_SYSRQ
 521         {
 522                 .ctl_name       = KERN_SYSRQ,
 523                 .procname       = "sysrq",
 524                 .data           = &__sysrq_enabled,
 525                 .maxlen         = sizeof (int),
 526                 .mode           = 0644,
 527                 .proc_handler   = &proc_dointvec,
 528         },
 529 #endif
 530 #ifdef CONFIG_PROC_SYSCTL
 531         {
 532                 .procname       = "cad_pid",
 533                 .data           = NULL,
 534                 .maxlen         = sizeof (int),
 535                 .mode           = 0600,
 536                 .proc_handler   = &proc_do_cad_pid,
 537         },
 538 #endif
 539         {
 540                 .ctl_name       = KERN_MAX_THREADS,
 541                 .procname       = "threads-max",
 542                 .data           = &max_threads,
 543                 .maxlen         = sizeof(int),
 544                 .mode           = 0644,
 545                 .proc_handler   = &proc_dointvec,
 546         },
 547         {
 548                 .ctl_name       = KERN_RANDOM,
 549                 .procname       = "random",
 550                 .mode           = 0555,
 551                 .child          = random_table,
 552         },
 553         {
 554                 .ctl_name       = KERN_OVERFLOWUID,
 555                 .procname       = "overflowuid",
 556                 .data           = &overflowuid,
 557                 .maxlen         = sizeof(int),
 558                 .mode           = 0644,
 559                 .proc_handler   = &proc_dointvec_minmax,
 560                 .strategy       = &sysctl_intvec,
 561                 .extra1         = &minolduid,
 562                 .extra2         = &maxolduid,
 563         },
 564         {
 565                 .ctl_name       = KERN_OVERFLOWGID,
 566                 .procname       = "overflowgid",
 567                 .data           = &overflowgid,
 568                 .maxlen         = sizeof(int),
 569                 .mode           = 0644,
 570                 .proc_handler   = &proc_dointvec_minmax,
 571                 .strategy       = &sysctl_intvec,
 572                 .extra1         = &minolduid,
 573                 .extra2         = &maxolduid,
 574         },
 575 #ifdef CONFIG_S390
 576 #ifdef CONFIG_MATHEMU
 577         {
 578                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 579                 .procname       = "ieee_emulation_warnings",
 580                 .data           = &sysctl_ieee_emulation_warnings,
 581                 .maxlen         = sizeof(int),
 582                 .mode           = 0644,
 583                 .proc_handler   = &proc_dointvec,
 584         },
 585 #endif
 586         {
 587                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 588                 .procname       = "userprocess_debug",
 589                 .data           = &sysctl_userprocess_debug,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = &proc_dointvec,
 593         },
 594 #endif
 595         {
 596                 .ctl_name       = KERN_PIDMAX,
 597                 .procname       = "pid_max",
 598                 .data           = &pid_max,
 599                 .maxlen         = sizeof (int),
 600                 .mode           = 0644,
 601                 .proc_handler   = &proc_dointvec_minmax,
 602                 .strategy       = sysctl_intvec,
 603                 .extra1         = &pid_max_min,
 604                 .extra2         = &pid_max_max,
 605         },
 606         {
 607                 .ctl_name       = KERN_PANIC_ON_OOPS,
 608                 .procname       = "panic_on_oops",
 609                 .data           = &panic_on_oops,
 610                 .maxlen         = sizeof(int),
 611                 .mode           = 0644,
 612                 .proc_handler   = &proc_dointvec,
 613         },
 614 #if defined CONFIG_PRINTK
 615         {
 616                 .ctl_name       = KERN_PRINTK,
 617                 .procname       = "printk",
 618                 .data           = &console_loglevel,
 619                 .maxlen         = 4*sizeof(int),
 620                 .mode           = 0644,
 621                 .proc_handler   = &proc_dointvec,
 622         },
 623         {
 624                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 625                 .procname       = "printk_ratelimit",
 626                 .data           = &printk_ratelimit_jiffies,
 627                 .maxlen         = sizeof(int),
 628                 .mode           = 0644,
 629                 .proc_handler   = &proc_dointvec_jiffies,
 630                 .strategy       = &sysctl_jiffies,
 631         },
 632         {
 633                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 634                 .procname       = "printk_ratelimit_burst",
 635                 .data           = &printk_ratelimit_burst,
 636                 .maxlen         = sizeof(int),
 637                 .mode           = 0644,
 638                 .proc_handler   = &proc_dointvec,
 639         },
 640 #endif
 641         {
 642                 .ctl_name       = KERN_NGROUPS_MAX,
 643                 .procname       = "ngroups_max",
 644                 .data           = &ngroups_max,
 645                 .maxlen         = sizeof (int),
 646                 .mode           = 0444,
 647                 .proc_handler   = &proc_dointvec,
 648         },
 649 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 650         {
 651                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 652                 .procname       = "unknown_nmi_panic",
 653                 .data           = &unknown_nmi_panic,
 654                 .maxlen         = sizeof (int),
 655                 .mode           = 0644,
 656                 .proc_handler   = &proc_dointvec,
 657         },
 658         {
 659                 .procname       = "nmi_watchdog",
 660                 .data           = &nmi_watchdog_enabled,
 661                 .maxlen         = sizeof (int),
 662                 .mode           = 0644,
 663                 .proc_handler   = &proc_nmi_enabled,
 664         },
 665 #endif
 666 #if defined(CONFIG_X86)
 667         {
 668                 .ctl_name       = KERN_PANIC_ON_NMI,
 669                 .procname       = "panic_on_unrecovered_nmi",
 670                 .data           = &panic_on_unrecovered_nmi,
 671                 .maxlen         = sizeof(int),
 672                 .mode           = 0644,
 673                 .proc_handler   = &proc_dointvec,
 674         },
 675         {
 676                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 677                 .procname       = "bootloader_type",
 678                 .data           = &bootloader_type,
 679                 .maxlen         = sizeof (int),
 680                 .mode           = 0444,
 681                 .proc_handler   = &proc_dointvec,
 682         },
 683         {
 684                 .ctl_name       = CTL_UNNUMBERED,
 685                 .procname       = "kstack_depth_to_print",
 686                 .data           = &kstack_depth_to_print,
 687                 .maxlen         = sizeof(int),
 688                 .mode           = 0644,
 689                 .proc_handler   = &proc_dointvec,
 690         },
 691         {
 692                 .ctl_name       = CTL_UNNUMBERED,
 693                 .procname       = "io_delay_type",
 694                 .data           = &io_delay_type,
 695                 .maxlen         = sizeof(int),
 696                 .mode           = 0644,
 697                 .proc_handler   = &proc_dointvec,
 698         },
 699 #endif
 700 #if defined(CONFIG_MMU)
 701         {
 702                 .ctl_name       = KERN_RANDOMIZE,
 703                 .procname       = "randomize_va_space",
 704                 .data           = &randomize_va_space,
 705                 .maxlen         = sizeof(int),
 706                 .mode           = 0644,
 707                 .proc_handler   = &proc_dointvec,
 708         },
 709 #endif
 710 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 711         {
 712                 .ctl_name       = KERN_SPIN_RETRY,
 713                 .procname       = "spin_retry",
 714                 .data           = &spin_retry,
 715                 .maxlen         = sizeof (int),
 716                 .mode           = 0644,
 717                 .proc_handler   = &proc_dointvec,
 718         },
 719 #endif
 720 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 721         {
 722                 .procname       = "acpi_video_flags",
 723                 .data           = &acpi_realmode_flags,
 724                 .maxlen         = sizeof (unsigned long),
 725                 .mode           = 0644,
 726                 .proc_handler   = &proc_doulongvec_minmax,
 727         },
 728 #endif
 729 #ifdef CONFIG_IA64
 730         {
 731                 .ctl_name       = KERN_IA64_UNALIGNED,
 732                 .procname       = "ignore-unaligned-usertrap",
 733                 .data           = &no_unaligned_warning,
 734                 .maxlen         = sizeof (int),
 735                 .mode           = 0644,
 736                 .proc_handler   = &proc_dointvec,
 737         },
 738 #endif
 739 #ifdef CONFIG_DETECT_SOFTLOCKUP
 740         {
 741                 .ctl_name       = CTL_UNNUMBERED,
 742                 .procname       = "softlockup_thresh",
 743                 .data           = &softlockup_thresh,
 744                 .maxlen         = sizeof(unsigned long),
 745                 .mode           = 0644,
 746                 .proc_handler   = &proc_doulongvec_minmax,
 747                 .strategy       = &sysctl_intvec,
 748                 .extra1         = &one,
 749                 .extra2         = &sixty,
 750         },
 751         {
 752                 .ctl_name       = CTL_UNNUMBERED,
 753                 .procname       = "hung_task_check_count",
 754                 .data           = &sysctl_hung_task_check_count,
 755                 .maxlen         = sizeof(unsigned long),
 756                 .mode           = 0644,
 757                 .proc_handler   = &proc_doulongvec_minmax,
 758                 .strategy       = &sysctl_intvec,
 759         },
 760         {
 761                 .ctl_name       = CTL_UNNUMBERED,
 762                 .procname       = "hung_task_timeout_secs",
 763                 .data           = &sysctl_hung_task_timeout_secs,
 764                 .maxlen         = sizeof(unsigned long),
 765                 .mode           = 0644,
 766                 .proc_handler   = &proc_doulongvec_minmax,
 767                 .strategy       = &sysctl_intvec,
 768         },
 769         {
 770                 .ctl_name       = CTL_UNNUMBERED,
 771                 .procname       = "hung_task_warnings",
 772                 .data           = &sysctl_hung_task_warnings,
 773                 .maxlen         = sizeof(unsigned long),
 774                 .mode           = 0644,
 775                 .proc_handler   = &proc_doulongvec_minmax,
 776                 .strategy       = &sysctl_intvec,
 777         },
 778 #endif
 779 #ifdef CONFIG_COMPAT
 780         {
 781                 .ctl_name       = KERN_COMPAT_LOG,
 782                 .procname       = "compat-log",
 783                 .data           = &compat_log,
 784                 .maxlen         = sizeof (int),
 785                 .mode           = 0644,
 786                 .proc_handler   = &proc_dointvec,
 787         },
 788 #endif
 789 #ifdef CONFIG_RT_MUTEXES
 790         {
 791                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 792                 .procname       = "max_lock_depth",
 793                 .data           = &max_lock_depth,
 794                 .maxlen         = sizeof(int),
 795                 .mode           = 0644,
 796                 .proc_handler   = &proc_dointvec,
 797         },
 798 #endif
 799 #ifdef CONFIG_PROC_FS
 800         {
 801                 .ctl_name       = CTL_UNNUMBERED,
 802                 .procname       = "maps_protect",
 803                 .data           = &maps_protect,
 804                 .maxlen         = sizeof(int),
 805                 .mode           = 0644,
 806                 .proc_handler   = &proc_dointvec,
 807         },
 808 #endif
 809         {
 810                 .ctl_name       = CTL_UNNUMBERED,
 811                 .procname       = "poweroff_cmd",
 812                 .data           = &poweroff_cmd,
 813                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 814                 .mode           = 0644,
 815                 .proc_handler   = &proc_dostring,
 816                 .strategy       = &sysctl_string,
 817         },
 818 #ifdef CONFIG_KEYS
 819         {
 820                 .ctl_name       = CTL_UNNUMBERED,
 821                 .procname       = "keys",
 822                 .mode           = 0555,
 823                 .child          = key_sysctls,
 824         },
 825 #endif
 826 #ifdef CONFIG_RCU_TORTURE_TEST
 827         {
 828                 .ctl_name       = CTL_UNNUMBERED,
 829                 .procname       = "rcutorture_runnable",
 830                 .data           = &rcutorture_runnable,
 831                 .maxlen         = sizeof(int),
 832                 .mode           = 0644,
 833                 .proc_handler   = &proc_dointvec,
 834         },
 835 #endif
 836 /*
 837  * NOTE: do not add new entries to this table unless you have read
 838  * Documentation/sysctl/ctl_unnumbered.txt
 839  */
 840         { .ctl_name = 0 }
 841 };
 842
 843 static struct ctl_table vm_table[] = {
 844         {
 845                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 846                 .procname       = "overcommit_memory",
 847                 .data           = &sysctl_overcommit_memory,
 848                 .maxlen         = sizeof(sysctl_overcommit_memory),
 849                 .mode           = 0644,
 850                 .proc_handler   = &proc_dointvec,
 851         },
 852         {
 853                 .ctl_name       = VM_PANIC_ON_OOM,
 854                 .procname       = "panic_on_oom",
 855                 .data           = &sysctl_panic_on_oom,
 856                 .maxlen         = sizeof(sysctl_panic_on_oom),
 857                 .mode           = 0644,
 858                 .proc_handler   = &proc_dointvec,
 859         },
 860         {
 861                 .ctl_name       = CTL_UNNUMBERED,
 862                 .procname       = "oom_kill_allocating_task",
 863                 .data           = &sysctl_oom_kill_allocating_task,
 864                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 865                 .mode           = 0644,
 866                 .proc_handler   = &proc_dointvec,
 867         },
 868         {
 869                 .ctl_name       = CTL_UNNUMBERED,
 870                 .procname       = "oom_dump_tasks",
 871                 .data           = &sysctl_oom_dump_tasks,
 872                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 873                 .mode           = 0644,
 874                 .proc_handler   = &proc_dointvec,
 875         },
 876         {
 877                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 878                 .procname       = "overcommit_ratio",
 879                 .data           = &sysctl_overcommit_ratio,
 880                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 881                 .mode           = 0644,
 882                 .proc_handler   = &proc_dointvec,
 883         },
 884         {
 885                 .ctl_name       = VM_PAGE_CLUSTER,
 886                 .procname       = "page-cluster",
 887                 .data           = &page_cluster,
 888                 .maxlen         = sizeof(int),
 889                 .mode           = 0644,
 890                 .proc_handler   = &proc_dointvec,
 891         },
 892         {
 893                 .ctl_name       = VM_DIRTY_BACKGROUND,
 894                 .procname       = "dirty_background_ratio",
 895                 .data           = &dirty_background_ratio,
 896                 .maxlen         = sizeof(dirty_background_ratio),
 897                 .mode           = 0644,
 898                 .proc_handler   = &proc_dointvec_minmax,
 899                 .strategy       = &sysctl_intvec,
 900                 .extra1         = &zero,
 901                 .extra2         = &one_hundred,
 902         },
 903         {
 904                 .ctl_name       = VM_DIRTY_RATIO,
 905                 .procname       = "dirty_ratio",
 906                 .data           = &vm_dirty_ratio,
 907                 .maxlen         = sizeof(vm_dirty_ratio),
 908                 .mode           = 0644,
 909                 .proc_handler   = &dirty_ratio_handler,
 910                 .strategy       = &sysctl_intvec,
 911                 .extra1         = &zero,
 912                 .extra2         = &one_hundred,
 913         },
 914         {
 915                 .procname       = "dirty_writeback_centisecs",
 916                 .data           = &dirty_writeback_interval,
 917                 .maxlen         = sizeof(dirty_writeback_interval),
 918                 .mode           = 0644,
 919                 .proc_handler   = &dirty_writeback_centisecs_handler,
 920         },
 921         {
 922                 .procname       = "dirty_expire_centisecs",
 923                 .data           = &dirty_expire_interval,
 924                 .maxlen         = sizeof(dirty_expire_interval),
 925                 .mode           = 0644,
 926                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 927         },
 928         {
 929                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 930                 .procname       = "nr_pdflush_threads",
 931                 .data           = &nr_pdflush_threads,
 932                 .maxlen         = sizeof nr_pdflush_threads,
 933                 .mode           = 0444 /* read-only*/,
 934                 .proc_handler   = &proc_dointvec,
 935         },
 936         {
 937                 .ctl_name       = VM_SWAPPINESS,
 938                 .procname       = "swappiness",
 939                 .data           = &vm_swappiness,
 940                 .maxlen         = sizeof(vm_swappiness),
 941                 .mode           = 0644,
 942                 .proc_handler   = &proc_dointvec_minmax,
 943                 .strategy       = &sysctl_intvec,
 944                 .extra1         = &zero,
 945                 .extra2         = &one_hundred,
 946         },
 947 #ifdef CONFIG_HUGETLB_PAGE
 948          {
 949                 .procname       = "nr_hugepages",
 950                 .data           = &max_huge_pages,
 951                 .maxlen         = sizeof(unsigned long),
 952                 .mode           = 0644,
 953                 .proc_handler   = &hugetlb_sysctl_handler,
 954                 .extra1         = (void *)&hugetlb_zero,
 955                 .extra2         = (void *)&hugetlb_infinity,
 956          },
 957          {
 958                 .ctl_name       = VM_HUGETLB_GROUP,
 959                 .procname       = "hugetlb_shm_group",
 960                 .data           = &sysctl_hugetlb_shm_group,
 961                 .maxlen         = sizeof(gid_t),
 962                 .mode           = 0644,
 963                 .proc_handler   = &proc_dointvec,
 964          },
 965          {
 966                 .ctl_name       = CTL_UNNUMBERED,
 967                 .procname       = "hugepages_treat_as_movable",
 968                 .data           = &hugepages_treat_as_movable,
 969                 .maxlen         = sizeof(int),
 970                 .mode           = 0644,
 971                 .proc_handler   = &hugetlb_treat_movable_handler,
 972         },
 973         {
 974                 .ctl_name       = CTL_UNNUMBERED,
 975                 .procname       = "nr_overcommit_hugepages",
 976                 .data           = &sysctl_overcommit_huge_pages,
 977                 .maxlen         = sizeof(sysctl_overcommit_huge_pages),
 978                 .mode           = 0644,
 979                 .proc_handler   = &hugetlb_overcommit_handler,
 980         },
 981 #endif
 982         {
 983                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 984                 .procname       = "lowmem_reserve_ratio",
 985                 .data           = &sysctl_lowmem_reserve_ratio,
 986                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 987                 .mode           = 0644,
 988                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 989                 .strategy       = &sysctl_intvec,
 990         },
 991         {
 992                 .ctl_name       = VM_DROP_PAGECACHE,
 993                 .procname       = "drop_caches",
 994                 .data           = &sysctl_drop_caches,
 995                 .maxlen         = sizeof(int),
 996                 .mode           = 0644,
 997                 .proc_handler   = drop_caches_sysctl_handler,
 998                 .strategy       = &sysctl_intvec,
 999         },
1000         {
1001                 .ctl_name       = VM_MIN_FREE_KBYTES,
1002                 .procname       = "min_free_kbytes",
1003                 .data           = &min_free_kbytes,
1004                 .maxlen         = sizeof(min_free_kbytes),
1005                 .mode           = 0644,
1006                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1007                 .strategy       = &sysctl_intvec,
1008                 .extra1         = &zero,
1009         },
1010         {
1011                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1012                 .procname       = "percpu_pagelist_fraction",
1013                 .data           = &percpu_pagelist_fraction,
1014                 .maxlen         = sizeof(percpu_pagelist_fraction),
1015                 .mode           = 0644,
1016                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1017                 .strategy       = &sysctl_intvec,
1018                 .extra1         = &min_percpu_pagelist_fract,
1019         },
1020 #ifdef CONFIG_MMU
1021         {
1022                 .ctl_name       = VM_MAX_MAP_COUNT,
1023                 .procname       = "max_map_count",
1024                 .data           = &sysctl_max_map_count,
1025                 .maxlen         = sizeof(sysctl_max_map_count),
1026                 .mode           = 0644,
1027                 .proc_handler   = &proc_dointvec
1028         },
1029 #endif
1030         {
1031                 .ctl_name       = VM_LAPTOP_MODE,
1032                 .procname       = "laptop_mode",
1033                 .data           = &laptop_mode,
1034                 .maxlen         = sizeof(laptop_mode),
1035                 .mode           = 0644,
1036                 .proc_handler   = &proc_dointvec_jiffies,
1037                 .strategy       = &sysctl_jiffies,
1038         },
1039         {
1040                 .ctl_name       = VM_BLOCK_DUMP,
1041                 .procname       = "block_dump",
1042                 .data           = &block_dump,
1043                 .maxlen         = sizeof(block_dump),
1044                 .mode           = 0644,
1045                 .proc_handler   = &proc_dointvec,
1046                 .strategy       = &sysctl_intvec,
1047                 .extra1         = &zero,
1048         },
1049         {
1050                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1051                 .procname       = "vfs_cache_pressure",
1052                 .data           = &sysctl_vfs_cache_pressure,
1053                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1054                 .mode           = 0644,
1055                 .proc_handler   = &proc_dointvec,
1056                 .strategy       = &sysctl_intvec,
1057                 .extra1         = &zero,
1058         },
1059 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1060         {
1061                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1062                 .procname       = "legacy_va_layout",
1063                 .data           = &sysctl_legacy_va_layout,
1064                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1065                 .mode           = 0644,
1066                 .proc_handler   = &proc_dointvec,
1067                 .strategy       = &sysctl_intvec,
1068                 .extra1         = &zero,
1069         },
1070 #endif
1071 #ifdef CONFIG_NUMA
1072         {
1073                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1074                 .procname       = "zone_reclaim_mode",
1075                 .data           = &zone_reclaim_mode,
1076                 .maxlen         = sizeof(zone_reclaim_mode),
1077                 .mode           = 0644,
1078                 .proc_handler   = &proc_dointvec,
1079                 .strategy       = &sysctl_intvec,
1080                 .extra1         = &zero,
1081         },
1082         {
1083                 .ctl_name       = VM_MIN_UNMAPPED,
1084                 .procname       = "min_unmapped_ratio",
1085                 .data           = &sysctl_min_unmapped_ratio,
1086                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1087                 .mode           = 0644,
1088                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1089                 .strategy       = &sysctl_intvec,
1090                 .extra1         = &zero,
1091                 .extra2         = &one_hundred,
1092         },
1093         {
1094                 .ctl_name       = VM_MIN_SLAB,
1095                 .procname       = "min_slab_ratio",
1096                 .data           = &sysctl_min_slab_ratio,
1097                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1098                 .mode           = 0644,
1099                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1100                 .strategy       = &sysctl_intvec,
1101                 .extra1         = &zero,
1102                 .extra2         = &one_hundred,
1103         },
1104 #endif
1105 #ifdef CONFIG_SMP
1106         {
1107                 .ctl_name       = CTL_UNNUMBERED,
1108                 .procname       = "stat_interval",
1109                 .data           = &sysctl_stat_interval,
1110                 .maxlen         = sizeof(sysctl_stat_interval),
1111                 .mode           = 0644,
1112                 .proc_handler   = &proc_dointvec_jiffies,
1113                 .strategy       = &sysctl_jiffies,
1114         },
1115 #endif
1116 #ifdef CONFIG_SECURITY
1117         {
1118                 .ctl_name       = CTL_UNNUMBERED,
1119                 .procname       = "mmap_min_addr",
1120                 .data           = &mmap_min_addr,
1121                 .maxlen         = sizeof(unsigned long),
1122                 .mode           = 0644,
1123                 .proc_handler   = &proc_doulongvec_minmax,
1124         },
1125 #endif
1126 #ifdef CONFIG_NUMA
1127         {
1128                 .ctl_name       = CTL_UNNUMBERED,
1129                 .procname       = "numa_zonelist_order",
1130                 .data           = &numa_zonelist_order,
1131                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1132                 .mode           = 0644,
1133                 .proc_handler   = &numa_zonelist_order_handler,
1134                 .strategy       = &sysctl_string,
1135         },
1136 #endif
1137 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1138    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1139         {
1140                 .ctl_name       = VM_VDSO_ENABLED,
1141                 .procname       = "vdso_enabled",
1142                 .data           = &vdso_enabled,
1143                 .maxlen         = sizeof(vdso_enabled),
1144                 .mode           = 0644,
1145                 .proc_handler   = &proc_dointvec,
1146                 .strategy       = &sysctl_intvec,
1147                 .extra1         = &zero,
1148         },
1149 #endif
1150 #ifdef CONFIG_HIGHMEM
1151         {
1152                 .ctl_name       = CTL_UNNUMBERED,
1153                 .procname       = "highmem_is_dirtyable",
1154                 .data           = &vm_highmem_is_dirtyable,
1155                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1156                 .mode           = 0644,
1157                 .proc_handler   = &proc_dointvec_minmax,
1158                 .strategy       = &sysctl_intvec,
1159                 .extra1         = &zero,
1160                 .extra2         = &one,
1161         },
1162 #endif
1163 /*
1164  * NOTE: do not add new entries to this table unless you have read
1165  * Documentation/sysctl/ctl_unnumbered.txt
1166  */
1167         { .ctl_name = 0 }
1168 };
1169
1170 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1171 static struct ctl_table binfmt_misc_table[] = {
1172         { .ctl_name = 0 }
1173 };
1174 #endif
1175
1176 static struct ctl_table fs_table[] = {
1177         {
1178                 .ctl_name       = FS_NRINODE,
1179                 .procname       = "inode-nr",
1180                 .data           = &inodes_stat,
1181                 .maxlen         = 2*sizeof(int),
1182                 .mode           = 0444,
1183                 .proc_handler   = &proc_dointvec,
1184         },
1185         {
1186                 .ctl_name       = FS_STATINODE,
1187                 .procname       = "inode-state",
1188                 .data           = &inodes_stat,
1189                 .maxlen         = 7*sizeof(int),
1190                 .mode           = 0444,
1191                 .proc_handler   = &proc_dointvec,
1192         },
1193         {
1194                 .procname       = "file-nr",
1195                 .data           = &files_stat,
1196                 .maxlen         = 3*sizeof(int),
1197                 .mode           = 0444,
1198                 .proc_handler   = &proc_nr_files,
1199         },
1200         {
1201                 .ctl_name       = FS_MAXFILE,
1202                 .procname       = "file-max",
1203                 .data           = &files_stat.max_files,
1204                 .maxlen         = sizeof(int),
1205                 .mode           = 0644,
1206                 .proc_handler   = &proc_dointvec,
1207         },
1208         {
1209                 .ctl_name       = CTL_UNNUMBERED,
1210                 .procname       = "nr_open",
1211                 .data           = &sysctl_nr_open,
1212                 .maxlen         = sizeof(int),
1213                 .mode           = 0644,
1214                 .proc_handler   = &proc_dointvec_minmax,
1215                 .extra1         = &sysctl_nr_open_min,
1216                 .extra2         = &sysctl_nr_open_max,
1217         },
1218         {
1219                 .ctl_name       = FS_DENTRY,
1220                 .procname       = "dentry-state",
1221                 .data           = &dentry_stat,
1222                 .maxlen         = 6*sizeof(int),
1223                 .mode           = 0444,
1224                 .proc_handler   = &proc_dointvec,
1225         },
1226         {
1227                 .ctl_name       = FS_OVERFLOWUID,
1228                 .procname       = "overflowuid",
1229                 .data           = &fs_overflowuid,
1230                 .maxlen         = sizeof(int),
1231                 .mode           = 0644,
1232                 .proc_handler   = &proc_dointvec_minmax,
1233                 .strategy       = &sysctl_intvec,
1234                 .extra1         = &minolduid,
1235                 .extra2         = &maxolduid,
1236         },
1237         {
1238                 .ctl_name       = FS_OVERFLOWGID,
1239                 .procname       = "overflowgid",
1240                 .data           = &fs_overflowgid,
1241                 .maxlen         = sizeof(int),
1242                 .mode           = 0644,
1243                 .proc_handler   = &proc_dointvec_minmax,
1244                 .strategy       = &sysctl_intvec,
1245                 .extra1         = &minolduid,
1246                 .extra2         = &maxolduid,
1247         },
1248         {
1249                 .ctl_name       = FS_LEASES,
1250                 .procname       = "leases-enable",
1251                 .data           = &leases_enable,
1252                 .maxlen         = sizeof(int),
1253                 .mode           = 0644,
1254                 .proc_handler   = &proc_dointvec,
1255         },
1256 #ifdef CONFIG_DNOTIFY
1257         {
1258                 .ctl_name       = FS_DIR_NOTIFY,
1259                 .procname       = "dir-notify-enable",
1260                 .data           = &dir_notify_enable,
1261                 .maxlen         = sizeof(int),
1262                 .mode           = 0644,
1263                 .proc_handler   = &proc_dointvec,
1264         },
1265 #endif
1266 #ifdef CONFIG_MMU
1267         {
1268                 .ctl_name       = FS_LEASE_TIME,
1269                 .procname       = "lease-break-time",
1270                 .data           = &lease_break_time,
1271                 .maxlen         = sizeof(int),
1272                 .mode           = 0644,
1273                 .proc_handler   = &proc_dointvec_minmax,
1274                 .strategy       = &sysctl_intvec,
1275                 .extra1         = &zero,
1276                 .extra2         = &two,
1277         },
1278         {
1279                 .procname       = "aio-nr",
1280                 .data           = &aio_nr,
1281                 .maxlen         = sizeof(aio_nr),
1282                 .mode           = 0444,
1283                 .proc_handler   = &proc_doulongvec_minmax,
1284         },
1285         {
1286                 .procname       = "aio-max-nr",
1287                 .data           = &aio_max_nr,
1288                 .maxlen         = sizeof(aio_max_nr),
1289                 .mode           = 0644,
1290                 .proc_handler   = &proc_doulongvec_minmax,
1291         },
1292 #ifdef CONFIG_INOTIFY_USER
1293         {
1294                 .ctl_name       = FS_INOTIFY,
1295                 .procname       = "inotify",
1296                 .mode           = 0555,
1297                 .child          = inotify_table,
1298         },
1299 #endif
1300 #endif
1301         {
1302                 .ctl_name       = KERN_SETUID_DUMPABLE,
1303                 .procname       = "suid_dumpable",
1304                 .data           = &suid_dumpable,
1305                 .maxlen         = sizeof(int),
1306                 .mode           = 0644,
1307                 .proc_handler   = &proc_dointvec,
1308         },
1309 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1310         {
1311                 .ctl_name       = CTL_UNNUMBERED,
1312                 .procname       = "binfmt_misc",
1313                 .mode           = 0555,
1314                 .child          = binfmt_misc_table,
1315         },
1316 #endif
1317 /*
1318  * NOTE: do not add new entries to this table unless you have read
1319  * Documentation/sysctl/ctl_unnumbered.txt
1320  */
1321         { .ctl_name = 0 }
1322 };
1323
1324 static struct ctl_table debug_table[] = {
1325 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1326         {
1327                 .ctl_name       = CTL_UNNUMBERED,
1328                 .procname       = "exception-trace",
1329                 .data           = &show_unhandled_signals,
1330                 .maxlen         = sizeof(int),
1331                 .mode           = 0644,
1332                 .proc_handler   = proc_dointvec
1333         },
1334 #endif
1335         { .ctl_name = 0 }
1336 };
1337
1338 static struct ctl_table dev_table[] = {
1339         { .ctl_name = 0 }
1340 };
1341
1342 static DEFINE_SPINLOCK(sysctl_lock);
1343
1344 /* called under sysctl_lock */
1345 static int use_table(struct ctl_table_header *p)
1346 {
1347         if (unlikely(p->unregistering))
1348                 return 0;
1349         p->used++;
1350         return 1;
1351 }
1352
1353 /* called under sysctl_lock */
1354 static void unuse_table(struct ctl_table_header *p)
1355 {
1356         if (!--p->used)
1357                 if (unlikely(p->unregistering))
1358                         complete(p->unregistering);
1359 }
1360
1361 /* called under sysctl_lock, will reacquire if has to wait */
1362 static void start_unregistering(struct ctl_table_header *p)
1363 {
1364         /*
1365          * if p->used is 0, nobody will ever touch that entry again;
1366          * we'll eliminate all paths to it before dropping sysctl_lock
1367          */
1368         if (unlikely(p->used)) {
1369                 struct completion wait;
1370                 init_completion(&wait);
1371                 p->unregistering = &wait;
1372                 spin_unlock(&sysctl_lock);
1373                 wait_for_completion(&wait);
1374                 spin_lock(&sysctl_lock);
1375         }
1376         /*
1377          * do not remove from the list until nobody holds it; walking the
1378          * list in do_sysctl() relies on that.
1379          */
1380         list_del_init(&p->ctl_entry);
1381 }
1382
1383 void sysctl_head_finish(struct ctl_table_header *head)
1384 {
1385         if (!head)
1386                 return;
1387         spin_lock(&sysctl_lock);
1388         unuse_table(head);
1389         spin_unlock(&sysctl_lock);
1390 }
1391
1392 static struct list_head *
1393 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1394 {
1395         struct list_head *header_list;
1396         header_list = &root->header_list;
1397         if (root->lookup)
1398                 header_list = root->lookup(root, namespaces);
1399         return header_list;
1400 }
1401
1402 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1403                                             struct ctl_table_header *prev)
1404 {
1405         struct ctl_table_root *root;
1406         struct list_head *header_list;
1407         struct ctl_table_header *head;
1408         struct list_head *tmp;
1409
1410         spin_lock(&sysctl_lock);
1411         if (prev) {
1412                 head = prev;
1413                 tmp = &prev->ctl_entry;
1414                 unuse_table(prev);
1415                 goto next;
1416         }
1417         tmp = &root_table_header.ctl_entry;
1418         for (;;) {
1419                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1420
1421                 if (!use_table(head))
1422                         goto next;
1423                 spin_unlock(&sysctl_lock);
1424                 return head;
1425         next:
1426                 root = head->root;
1427                 tmp = tmp->next;
1428                 header_list = lookup_header_list(root, namespaces);
1429                 if (tmp != header_list)
1430                         continue;
1431
1432                 do {
1433                         root = list_entry(root->root_list.next,
1434                                         struct ctl_table_root, root_list);
1435                         if (root == &sysctl_table_root)
1436                                 goto out;
1437                         header_list = lookup_header_list(root, namespaces);
1438                 } while (list_empty(header_list));
1439                 tmp = header_list->next;
1440         }
1441 out:
1442         spin_unlock(&sysctl_lock);
1443         return NULL;
1444 }
1445
1446 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1447 {
1448         return __sysctl_head_next(current->nsproxy, prev);
1449 }
1450
1451 void register_sysctl_root(struct ctl_table_root *root)
1452 {
1453         spin_lock(&sysctl_lock);
1454         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1455         spin_unlock(&sysctl_lock);
1456 }
1457
1458 #ifdef CONFIG_SYSCTL_SYSCALL
1459 /* Perform the actual read/write of a sysctl table entry. */
1460 static int do_sysctl_strategy(struct ctl_table_root *root,
1461                         struct ctl_table *table,
1462                         int __user *name, int nlen,
1463                         void __user *oldval, size_t __user *oldlenp,
1464                         void __user *newval, size_t newlen)
1465 {
1466         int op = 0, rc;
1467
1468         if (oldval)
1469                 op |= 004;
1470         if (newval)
1471                 op |= 002;
1472         if (sysctl_perm(root, table, op))
1473                 return -EPERM;
1474
1475         if (table->strategy) {
1476                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1477                                      newval, newlen);
1478                 if (rc < 0)
1479                         return rc;
1480                 if (rc > 0)
1481                         return 0;
1482         }
1483
1484         /* If there is no strategy routine, or if the strategy returns
1485          * zero, proceed with automatic r/w */
1486         if (table->data && table->maxlen) {
1487                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1488                                  newval, newlen);
1489                 if (rc < 0)
1490                         return rc;
1491         }
1492         return 0;
1493 }
1494
1495 static int parse_table(int __user *name, int nlen,
1496                        void __user *oldval, size_t __user *oldlenp,
1497                        void __user *newval, size_t newlen,
1498                        struct ctl_table_root *root,
1499                        struct ctl_table *table)
1500 {
1501         int n;
1502 repeat:
1503         if (!nlen)
1504                 return -ENOTDIR;
1505         if (get_user(n, name))
1506                 return -EFAULT;
1507         for ( ; table->ctl_name || table->procname; table++) {
1508                 if (!table->ctl_name)
1509                         continue;
1510                 if (n == table->ctl_name) {
1511                         int error;
1512                         if (table->child) {
1513                                 if (sysctl_perm(root, table, 001))
1514                                         return -EPERM;
1515                                 name++;
1516                                 nlen--;
1517                                 table = table->child;
1518                                 goto repeat;
1519                         }
1520                         error = do_sysctl_strategy(root, table, name, nlen,
1521                                                    oldval, oldlenp,
1522                                                    newval, newlen);
1523                         return error;
1524                 }
1525         }
1526         return -ENOTDIR;
1527 }
1528
1529 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1530                void __user *newval, size_t newlen)
1531 {
1532         struct ctl_table_header *head;
1533         int error = -ENOTDIR;
1534
1535         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1536                 return -ENOTDIR;
1537         if (oldval) {
1538                 int old_len;
1539                 if (!oldlenp || get_user(old_len, oldlenp))
1540                         return -EFAULT;
1541         }
1542
1543         for (head = sysctl_head_next(NULL); head;
1544                         head = sysctl_head_next(head)) {
1545                 error = parse_table(name, nlen, oldval, oldlenp,
1546                                         newval, newlen,
1547                                         head->root, head->ctl_table);
1548                 if (error != -ENOTDIR) {
1549                         sysctl_head_finish(head);
1550                         break;
1551                 }
1552         }
1553         return error;
1554 }
1555
1556 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1557 {
1558         struct __sysctl_args tmp;
1559         int error;
1560
1561         if (copy_from_user(&tmp, args, sizeof(tmp)))
1562                 return -EFAULT;
1563
1564         error = deprecated_sysctl_warning(&tmp);
1565         if (error)
1566                 goto out;
1567
1568         lock_kernel();
1569         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1570                           tmp.newval, tmp.newlen);
1571         unlock_kernel();
1572 out:
1573         return error;
1574 }
1575 #endif /* CONFIG_SYSCTL_SYSCALL */
1576
1577 /*
1578  * sysctl_perm does NOT grant the superuser all rights automatically, because
1579  * some sysctl variables are readonly even to root.
1580  */
1581
1582 static int test_perm(int mode, int op)
1583 {
1584         if (!current->euid)
1585                 mode >>= 6;
1586         else if (in_egroup_p(0))
1587                 mode >>= 3;
1588         if ((mode & op & 0007) == op)
1589                 return 0;
1590         return -EACCES;
1591 }
1592
1593 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1594 {
1595         int error;
1596         int mode;
1597
1598         error = security_sysctl(table, op);
1599         if (error)
1600                 return error;
1601
1602         if (root->permissions)
1603                 mode = root->permissions(root, current->nsproxy, table);
1604         else
1605                 mode = table->mode;
1606
1607         return test_perm(mode, op);
1608 }
1609
1610 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1611 {
1612         for (; table->ctl_name || table->procname; table++) {
1613                 table->parent = parent;
1614                 if (table->child)
1615                         sysctl_set_parent(table, table->child);
1616         }
1617 }
1618
1619 static __init int sysctl_init(void)
1620 {
1621         sysctl_set_parent(NULL, root_table);
1622 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1623         {
1624                 int err;
1625                 err = sysctl_check_table(current->nsproxy, root_table);
1626         }
1627 #endif
1628         return 0;
1629 }
1630
1631 core_initcall(sysctl_init);
1632
1633 /**
1634  * __register_sysctl_paths - register a sysctl hierarchy
1635  * @root: List of sysctl headers to register on
1636  * @namespaces: Data to compute which lists of sysctl entries are visible
1637  * @path: The path to the directory the sysctl table is in.
1638  * @table: the top-level table structure
1639  *
1640  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1641  * array. A completely 0 filled entry terminates the table.
1642  *
1643  * The members of the &struct ctl_table structure are used as follows:
1644  *
1645  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1646  *            must be unique within that level of sysctl
1647  *
1648  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1649  *            enter a sysctl file
1650  *
1651  * data - a pointer to data for use by proc_handler
1652  *
1653  * maxlen - the maximum size in bytes of the data
1654  *
1655  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1656  *
1657  * child - a pointer to the child sysctl table if this entry is a directory, or
1658  *         %NULL.
1659  *
1660  * proc_handler - the text handler routine (described below)
1661  *
1662  * strategy - the strategy routine (described below)
1663  *
1664  * de - for internal use by the sysctl routines
1665  *
1666  * extra1, extra2 - extra pointers usable by the proc handler routines
1667  *
1668  * Leaf nodes in the sysctl tree will be represented by a single file
1669  * under /proc; non-leaf nodes will be represented by directories.
1670  *
1671  * sysctl(2) can automatically manage read and write requests through
1672  * the sysctl table.  The data and maxlen fields of the ctl_table
1673  * struct enable minimal validation of the values being written to be
1674  * performed, and the mode field allows minimal authentication.
1675  *
1676  * More sophisticated management can be enabled by the provision of a
1677  * strategy routine with the table entry.  This will be called before
1678  * any automatic read or write of the data is performed.
1679  *
1680  * The strategy routine may return
1681  *
1682  * < 0 - Error occurred (error is passed to user process)
1683  *
1684  * 0   - OK - proceed with automatic read or write.
1685  *
1686  * > 0 - OK - read or write has been done by the strategy routine, so
1687  *       return immediately.
1688  *
1689  * There must be a proc_handler routine for any terminal nodes
1690  * mirrored under /proc/sys (non-terminals are handled by a built-in
1691  * directory handler).  Several default handlers are available to
1692  * cover common cases -
1693  *
1694  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1695  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1696  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1697  *
1698  * It is the handler's job to read the input buffer from user memory
1699  * and process it. The handler should return 0 on success.
1700  *
1701  * This routine returns %NULL on a failure to register, and a pointer
1702  * to the table header on success.
1703  */
1704 struct ctl_table_header *__register_sysctl_paths(
1705         struct ctl_table_root *root,
1706         struct nsproxy *namespaces,
1707         const struct ctl_path *path, struct ctl_table *table)
1708 {
1709         struct list_head *header_list;
1710         struct ctl_table_header *header;
1711         struct ctl_table *new, **prevp;
1712         unsigned int n, npath;
1713
1714         /* Count the path components */
1715         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1716                 ;
1717
1718         /*
1719          * For each path component, allocate a 2-element ctl_table array.
1720          * The first array element will be filled with the sysctl entry
1721          * for this, the second will be the sentinel (ctl_name == 0).
1722          *
1723          * We allocate everything in one go so that we don't have to
1724          * worry about freeing additional memory in unregister_sysctl_table.
1725          */
1726         header = kzalloc(sizeof(struct ctl_table_header) +
1727                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1728         if (!header)
1729                 return NULL;
1730
1731         new = (struct ctl_table *) (header + 1);
1732
1733         /* Now connect the dots */
1734         prevp = &header->ctl_table;
1735         for (n = 0; n < npath; ++n, ++path) {
1736                 /* Copy the procname */
1737                 new->procname = path->procname;
1738                 new->ctl_name = path->ctl_name;
1739                 new->mode     = 0555;
1740
1741                 *prevp = new;
1742                 prevp = &new->child;
1743
1744                 new += 2;
1745         }
1746         *prevp = table;
1747         header->ctl_table_arg = table;
1748
1749         INIT_LIST_HEAD(&header->ctl_entry);
1750         header->used = 0;
1751         header->unregistering = NULL;
1752         header->root = root;
1753         sysctl_set_parent(NULL, header->ctl_table);
1754 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1755         if (sysctl_check_table(namespaces, header->ctl_table)) {
1756                 kfree(header);
1757                 return NULL;
1758         }
1759 #endif
1760         spin_lock(&sysctl_lock);
1761         header_list = lookup_header_list(root, namespaces);
1762         list_add_tail(&header->ctl_entry, header_list);
1763         spin_unlock(&sysctl_lock);
1764
1765         return header;
1766 }
1767
1768 /**
1769  * register_sysctl_table_path - register a sysctl table hierarchy
1770  * @path: The path to the directory the sysctl table is in.
1771  * @table: the top-level table structure
1772  *
1773  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1774  * array. A completely 0 filled entry terminates the table.
1775  *
1776  * See __register_sysctl_paths for more details.
1777  */
1778 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1779                                                 struct ctl_table *table)
1780 {
1781         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1782                                         path, table);
1783 }
1784
1785 /**
1786  * register_sysctl_table - register a sysctl table hierarchy
1787  * @table: the top-level table structure
1788  *
1789  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1790  * array. A completely 0 filled entry terminates the table.
1791  *
1792  * See register_sysctl_paths for more details.
1793  */
1794 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1795 {
1796         static const struct ctl_path null_path[] = { {} };
1797
1798         return register_sysctl_paths(null_path, table);
1799 }
1800
1801 /**
1802  * unregister_sysctl_table - unregister a sysctl table hierarchy
1803  * @header: the header returned from register_sysctl_table
1804  *
1805  * Unregisters the sysctl table and all children. proc entries may not
1806  * actually be removed until they are no longer used by anyone.
1807  */
1808 void unregister_sysctl_table(struct ctl_table_header * header)
1809 {
1810         might_sleep();
1811
1812         if (header == NULL)
1813                 return;
1814
1815         spin_lock(&sysctl_lock);
1816         start_unregistering(header);
1817         spin_unlock(&sysctl_lock);
1818         kfree(header);
1819 }
1820
1821 #else /* !CONFIG_SYSCTL */
1822 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1823 {
1824         return NULL;
1825 }
1826
1827 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1828                                                     struct ctl_table *table)
1829 {
1830         return NULL;
1831 }
1832
1833 void unregister_sysctl_table(struct ctl_table_header * table)
1834 {
1835 }
1836
1837 #endif /* CONFIG_SYSCTL */
1838
1839 /*
1840  * /proc/sys support
1841  */
1842
1843 #ifdef CONFIG_PROC_SYSCTL
1844
1845 static int _proc_do_string(void* data, int maxlen, int write,
1846                            struct file *filp, void __user *buffer,
1847                            size_t *lenp, loff_t *ppos)
1848 {
1849         size_t len;
1850         char __user *p;
1851         char c;
1852
1853         if (!data || !maxlen || !*lenp) {
1854                 *lenp = 0;
1855                 return 0;
1856         }
1857
1858         if (write) {
1859                 len = 0;
1860                 p = buffer;
1861                 while (len < *lenp) {
1862                         if (get_user(c, p++))
1863                                 return -EFAULT;
1864                         if (c == 0 || c == '\n')
1865                                 break;
1866                         len++;
1867                 }
1868                 if (len >= maxlen)
1869                         len = maxlen-1;
1870                 if(copy_from_user(data, buffer, len))
1871                         return -EFAULT;
1872                 ((char *) data)[len] = 0;
1873                 *ppos += *lenp;
1874         } else {
1875                 len = strlen(data);
1876                 if (len > maxlen)
1877                         len = maxlen;
1878
1879                 if (*ppos > len) {
1880                         *lenp = 0;
1881                         return 0;
1882                 }
1883
1884                 data += *ppos;
1885                 len  -= *ppos;
1886
1887                 if (len > *lenp)
1888                         len = *lenp;
1889                 if (len)
1890                         if(copy_to_user(buffer, data, len))
1891                                 return -EFAULT;
1892                 if (len < *lenp) {
1893                         if(put_user('\n', ((char __user *) buffer) + len))
1894                                 return -EFAULT;
1895                         len++;
1896                 }
1897                 *lenp = len;
1898                 *ppos += len;
1899         }
1900         return 0;
1901 }
1902
1903 /**
1904  * proc_dostring - read a string sysctl
1905  * @table: the sysctl table
1906  * @write: %TRUE if this is a write to the sysctl file
1907  * @filp: the file structure
1908  * @buffer: the user buffer
1909  * @lenp: the size of the user buffer
1910  * @ppos: file position
1911  *
1912  * Reads/writes a string from/to the user buffer. If the kernel
1913  * buffer provided is not large enough to hold the string, the
1914  * string is truncated. The copied string is %NULL-terminated.
1915  * If the string is being read by the user process, it is copied
1916  * and a newline '\n' is added. It is truncated if the buffer is
1917  * not large enough.
1918  *
1919  * Returns 0 on success.
1920  */
1921 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1922                   void __user *buffer, size_t *lenp, loff_t *ppos)
1923 {
1924         return _proc_do_string(table->data, table->maxlen, write, filp,
1925                                buffer, lenp, ppos);
1926 }
1927
1928
1929 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1930                                  int *valp,
1931                                  int write, void *data)
1932 {
1933         if (write) {
1934                 *valp = *negp ? -*lvalp : *lvalp;
1935         } else {
1936                 int val = *valp;
1937                 if (val < 0) {
1938                         *negp = -1;
1939                         *lvalp = (unsigned long)-val;
1940                 } else {
1941                         *negp = 0;
1942                         *lvalp = (unsigned long)val;
1943                 }
1944         }
1945         return 0;
1946 }
1947
1948 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1949                   int write, struct file *filp, void __user *buffer,
1950                   size_t *lenp, loff_t *ppos,
1951                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1952                               int write, void *data),
1953                   void *data)
1954 {
1955 #define TMPBUFLEN 21
1956         int *i, vleft, first=1, neg, val;
1957         unsigned long lval;
1958         size_t left, len;
1959
1960         char buf[TMPBUFLEN], *p;
1961         char __user *s = buffer;
1962
1963         if (!tbl_data || !table->maxlen || !*lenp ||
1964             (*ppos && !write)) {
1965                 *lenp = 0;
1966                 return 0;
1967         }
1968
1969         i = (int *) tbl_data;
1970         vleft = table->maxlen / sizeof(*i);
1971         left = *lenp;
1972
1973         if (!conv)
1974                 conv = do_proc_dointvec_conv;
1975
1976         for (; left && vleft--; i++, first=0) {
1977                 if (write) {
1978                         while (left) {
1979                                 char c;
1980                                 if (get_user(c, s))
1981                                         return -EFAULT;
1982                                 if (!isspace(c))
1983                                         break;
1984                                 left--;
1985                                 s++;
1986                         }
1987                         if (!left)
1988                                 break;
1989                         neg = 0;
1990                         len = left;
1991                         if (len > sizeof(buf) - 1)
1992                                 len = sizeof(buf) - 1;
1993                         if (copy_from_user(buf, s, len))
1994                                 return -EFAULT;
1995                         buf[len] = 0;
1996                         p = buf;
1997                         if (*p == '-' && left > 1) {
1998                                 neg = 1;
1999                                 p++;
2000                         }
2001                         if (*p < '0' || *p > '9')
2002                                 break;
2003
2004                         lval = simple_strtoul(p, &p, 0);
2005
2006                         len = p-buf;
2007                         if ((len < left) && *p && !isspace(*p))
2008                                 break;
2009                         if (neg)
2010                                 val = -val;
2011                         s += len;
2012                         left -= len;
2013
2014                         if (conv(&neg, &lval, i, 1, data))
2015                                 break;
2016                 } else {
2017                         p = buf;
2018                         if (!first)
2019                                 *p++ = '\t';
2020
2021                         if (conv(&neg, &lval, i, 0, data))
2022                                 break;
2023
2024                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2025                         len = strlen(buf);
2026                         if (len > left)
2027                                 len = left;
2028                         if(copy_to_user(s, buf, len))
2029                                 return -EFAULT;
2030                         left -= len;
2031                         s += len;
2032                 }
2033         }
2034
2035         if (!write && !first && left) {
2036                 if(put_user('\n', s))
2037                         return -EFAULT;
2038                 left--, s++;
2039         }
2040         if (write) {
2041                 while (left) {
2042                         char c;
2043                         if (get_user(c, s++))
2044                                 return -EFAULT;
2045                         if (!isspace(c))
2046                                 break;
2047                         left--;
2048                 }
2049         }
2050         if (write && first)
2051                 return -EINVAL;
2052         *lenp -= left;
2053         *ppos += *lenp;
2054         return 0;
2055 #undef TMPBUFLEN
2056 }
2057
2058 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2059                   void __user *buffer, size_t *lenp, loff_t *ppos,
2060                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2061                               int write, void *data),
2062                   void *data)
2063 {
2064         return __do_proc_dointvec(table->data, table, write, filp,
2065                         buffer, lenp, ppos, conv, data);
2066 }
2067
2068 /**
2069  * proc_dointvec - read a vector of integers
2070  * @table: the sysctl table
2071  * @write: %TRUE if this is a write to the sysctl file
2072  * @filp: the file structure
2073  * @buffer: the user buffer
2074  * @lenp: the size of the user buffer
2075  * @ppos: file position
2076  *
2077  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2078  * values from/to the user buffer, treated as an ASCII string.
2079  *
2080  * Returns 0 on success.
2081  */
2082 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2083                      void __user *buffer, size_t *lenp, loff_t *ppos)
2084 {
2085     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2086                             NULL,NULL);
2087 }
2088
2089 #define OP_SET  0
2090 #define OP_AND  1
2091 #define OP_OR   2
2092
2093 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2094                                       int *valp,
2095                                       int write, void *data)
2096 {
2097         int op = *(int *)data;
2098         if (write) {
2099                 int val = *negp ? -*lvalp : *lvalp;
2100                 switch(op) {
2101                 case OP_SET:    *valp = val; break;
2102                 case OP_AND:    *valp &= val; break;
2103                 case OP_OR:     *valp |= val; break;
2104                 }
2105         } else {
2106                 int val = *valp;
2107                 if (val < 0) {
2108                         *negp = -1;
2109                         *lvalp = (unsigned long)-val;
2110                 } else {
2111                         *negp = 0;
2112                         *lvalp = (unsigned long)val;
2113                 }
2114         }
2115         return 0;
2116 }
2117
2118 /*
2119  *      Taint values can only be increased
2120  */
2121 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2122                                void __user *buffer, size_t *lenp, loff_t *ppos)
2123 {
2124         int op;
2125
2126         if (write && !capable(CAP_SYS_ADMIN))
2127                 return -EPERM;
2128
2129         op = OP_OR;
2130         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2131                                 do_proc_dointvec_bset_conv,&op);
2132 }
2133
2134 struct do_proc_dointvec_minmax_conv_param {
2135         int *min;
2136         int *max;
2137 };
2138
2139 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2140                                         int *valp,
2141                                         int write, void *data)
2142 {
2143         struct do_proc_dointvec_minmax_conv_param *param = data;
2144         if (write) {
2145                 int val = *negp ? -*lvalp : *lvalp;
2146                 if ((param->min && *param->min > val) ||
2147                     (param->max && *param->max < val))
2148                         return -EINVAL;
2149                 *valp = val;
2150         } else {
2151                 int val = *valp;
2152                 if (val < 0) {
2153                         *negp = -1;
2154                         *lvalp = (unsigned long)-val;
2155                 } else {
2156                         *negp = 0;
2157                         *lvalp = (unsigned long)val;
2158                 }
2159         }
2160         return 0;
2161 }
2162
2163 /**
2164  * proc_dointvec_minmax - read a vector of integers with min/max values
2165  * @table: the sysctl table
2166  * @write: %TRUE if this is a write to the sysctl file
2167  * @filp: the file structure
2168  * @buffer: the user buffer
2169  * @lenp: the size of the user buffer
2170  * @ppos: file position
2171  *
2172  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2173  * values from/to the user buffer, treated as an ASCII string.
2174  *
2175  * This routine will ensure the values are within the range specified by
2176  * table->extra1 (min) and table->extra2 (max).
2177  *
2178  * Returns 0 on success.
2179  */
2180 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2181                   void __user *buffer, size_t *lenp, loff_t *ppos)
2182 {
2183         struct do_proc_dointvec_minmax_conv_param param = {
2184                 .min = (int *) table->extra1,
2185                 .max = (int *) table->extra2,
2186         };
2187         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2188                                 do_proc_dointvec_minmax_conv, &param);
2189 }
2190
2191 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2192                                      struct file *filp,
2193                                      void __user *buffer,
2194                                      size_t *lenp, loff_t *ppos,
2195                                      unsigned long convmul,
2196                                      unsigned long convdiv)
2197 {
2198 #define TMPBUFLEN 21
2199         unsigned long *i, *min, *max, val;
2200         int vleft, first=1, neg;
2201         size_t len, left;
2202         char buf[TMPBUFLEN], *p;
2203         char __user *s = buffer;
2204
2205         if (!data || !table->maxlen || !*lenp ||
2206             (*ppos && !write)) {
2207                 *lenp = 0;
2208                 return 0;
2209         }
2210
2211         i = (unsigned long *) data;
2212         min = (unsigned long *) table->extra1;
2213         max = (unsigned long *) table->extra2;
2214         vleft = table->maxlen / sizeof(unsigned long);
2215         left = *lenp;
2216
2217         for (; left && vleft--; i++, min++, max++, first=0) {
2218                 if (write) {
2219                         while (left) {
2220                                 char c;
2221                                 if (get_user(c, s))
2222                                         return -EFAULT;
2223                                 if (!isspace(c))
2224                                         break;
2225                                 left--;
2226                                 s++;
2227                         }
2228                         if (!left)
2229                                 break;
2230                         neg = 0;
2231                         len = left;
2232                         if (len > TMPBUFLEN-1)
2233                                 len = TMPBUFLEN-1;
2234                         if (copy_from_user(buf, s, len))
2235                                 return -EFAULT;
2236                         buf[len] = 0;
2237                         p = buf;
2238                         if (*p == '-' && left > 1) {
2239                                 neg = 1;
2240                                 p++;
2241                         }
2242                         if (*p < '0' || *p > '9')
2243                                 break;
2244                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2245                         len = p-buf;
2246                         if ((len < left) && *p && !isspace(*p))
2247                                 break;
2248                         if (neg)
2249                                 val = -val;
2250                         s += len;
2251                         left -= len;
2252
2253                         if(neg)
2254                                 continue;
2255                         if ((min && val < *min) || (max && val > *max))
2256                                 continue;
2257                         *i = val;
2258                 } else {
2259                         p = buf;
2260                         if (!first)
2261                                 *p++ = '\t';
2262                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2263                         len = strlen(buf);
2264                         if (len > left)
2265                                 len = left;
2266                         if(copy_to_user(s, buf, len))
2267                                 return -EFAULT;
2268                         left -= len;
2269                         s += len;
2270                 }
2271         }
2272
2273         if (!write && !first && left) {
2274                 if(put_user('\n', s))
2275                         return -EFAULT;
2276                 left--, s++;
2277         }
2278         if (write) {
2279                 while (left) {
2280                         char c;
2281                         if (get_user(c, s++))
2282                                 return -EFAULT;
2283                         if (!isspace(c))
2284                                 break;
2285                         left--;
2286                 }
2287         }
2288         if (write && first)
2289                 return -EINVAL;
2290         *lenp -= left;
2291         *ppos += *lenp;
2292         return 0;
2293 #undef TMPBUFLEN
2294 }
2295
2296 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2297                                      struct file *filp,
2298                                      void __user *buffer,
2299                                      size_t *lenp, loff_t *ppos,
2300                                      unsigned long convmul,
2301                                      unsigned long convdiv)
2302 {
2303         return __do_proc_doulongvec_minmax(table->data, table, write,
2304                         filp, buffer, lenp, ppos, convmul, convdiv);
2305 }
2306
2307 /**
2308  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2309  * @table: the sysctl table
2310  * @write: %TRUE if this is a write to the sysctl file
2311  * @filp: the file structure
2312  * @buffer: the user buffer
2313  * @lenp: the size of the user buffer
2314  * @ppos: file position
2315  *
2316  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2317  * values from/to the user buffer, treated as an ASCII string.
2318  *
2319  * This routine will ensure the values are within the range specified by
2320  * table->extra1 (min) and table->extra2 (max).
2321  *
2322  * Returns 0 on success.
2323  */
2324 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2325                            void __user *buffer, size_t *lenp, loff_t *ppos)
2326 {
2327     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2328 }
2329
2330 /**
2331  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2332  * @table: the sysctl table
2333  * @write: %TRUE if this is a write to the sysctl file
2334  * @filp: the file structure
2335  * @buffer: the user buffer
2336  * @lenp: the size of the user buffer
2337  * @ppos: file position
2338  *
2339  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2340  * values from/to the user buffer, treated as an ASCII string. The values
2341  * are treated as milliseconds, and converted to jiffies when they are stored.
2342  *
2343  * This routine will ensure the values are within the range specified by
2344  * table->extra1 (min) and table->extra2 (max).
2345  *
2346  * Returns 0 on success.
2347  */
2348 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2349                                       struct file *filp,
2350                                       void __user *buffer,
2351                                       size_t *lenp, loff_t *ppos)
2352 {
2353     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2354                                      lenp, ppos, HZ, 1000l);
2355 }
2356
2357
2358 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2359                                          int *valp,
2360                                          int write, void *data)
2361 {
2362         if (write) {
2363                 if (*lvalp > LONG_MAX / HZ)
2364                         return 1;
2365                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2366         } else {
2367                 int val = *valp;
2368                 unsigned long lval;
2369                 if (val < 0) {
2370                         *negp = -1;
2371                         lval = (unsigned long)-val;
2372                 } else {
2373                         *negp = 0;
2374                         lval = (unsigned long)val;
2375                 }
2376                 *lvalp = lval / HZ;
2377         }
2378         return 0;
2379 }
2380
2381 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2382                                                 int *valp,
2383                                                 int write, void *data)
2384 {
2385         if (write) {
2386                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2387                         return 1;
2388                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2389         } else {
2390                 int val = *valp;
2391                 unsigned long lval;
2392                 if (val < 0) {
2393                         *negp = -1;
2394                         lval = (unsigned long)-val;
2395                 } else {
2396                         *negp = 0;
2397                         lval = (unsigned long)val;
2398                 }
2399                 *lvalp = jiffies_to_clock_t(lval);
2400         }
2401         return 0;
2402 }
2403
2404 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2405                                             int *valp,
2406                                             int write, void *data)
2407 {
2408         if (write) {
2409                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2410         } else {
2411                 int val = *valp;
2412                 unsigned long lval;
2413                 if (val < 0) {
2414                         *negp = -1;
2415                         lval = (unsigned long)-val;
2416                 } else {
2417                         *negp = 0;
2418                         lval = (unsigned long)val;
2419                 }
2420                 *lvalp = jiffies_to_msecs(lval);
2421         }
2422         return 0;
2423 }
2424
2425 /**
2426  * proc_dointvec_jiffies - read a vector of integers as seconds
2427  * @table: the sysctl table
2428  * @write: %TRUE if this is a write to the sysctl file
2429  * @filp: the file structure
2430  * @buffer: the user buffer
2431  * @lenp: the size of the user buffer
2432  * @ppos: file position
2433  *
2434  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2435  * values from/to the user buffer, treated as an ASCII string.
2436  * The values read are assumed to be in seconds, and are converted into
2437  * jiffies.
2438  *
2439  * Returns 0 on success.
2440  */
2441 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2442                           void __user *buffer, size_t *lenp, loff_t *ppos)
2443 {
2444     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2445                             do_proc_dointvec_jiffies_conv,NULL);
2446 }
2447
2448 /**
2449  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2450  * @table: the sysctl table
2451  * @write: %TRUE if this is a write to the sysctl file
2452  * @filp: the file structure
2453  * @buffer: the user buffer
2454  * @lenp: the size of the user buffer
2455  * @ppos: pointer to the file position
2456  *
2457  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2458  * values from/to the user buffer, treated as an ASCII string.
2459  * The values read are assumed to be in 1/USER_HZ seconds, and
2460  * are converted into jiffies.
2461  *
2462  * Returns 0 on success.
2463  */
2464 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2465                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2466 {
2467     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2468                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2469 }
2470
2471 /**
2472  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2473  * @table: the sysctl table
2474  * @write: %TRUE if this is a write to the sysctl file
2475  * @filp: the file structure
2476  * @buffer: the user buffer
2477  * @lenp: the size of the user buffer
2478  * @ppos: file position
2479  * @ppos: the current position in the file
2480  *
2481  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2482  * values from/to the user buffer, treated as an ASCII string.
2483  * The values read are assumed to be in 1/1000 seconds, and
2484  * are converted into jiffies.
2485  *
2486  * Returns 0 on success.
2487  */
2488 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2489                              void __user *buffer, size_t *lenp, loff_t *ppos)
2490 {
2491         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2492                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2493 }
2494
2495 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2496                            void __user *buffer, size_t *lenp, loff_t *ppos)
2497 {
2498         struct pid *new_pid;
2499         pid_t tmp;
2500         int r;
2501
2502         tmp = pid_vnr(cad_pid);
2503
2504         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2505                                lenp, ppos, NULL, NULL);
2506         if (r || !write)
2507                 return r;
2508
2509         new_pid = find_get_pid(tmp);
2510         if (!new_pid)
2511                 return -ESRCH;
2512
2513         put_pid(xchg(&cad_pid, new_pid));
2514         return 0;
2515 }
2516
2517 #else /* CONFIG_PROC_FS */
2518
2519 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2520                   void __user *buffer, size_t *lenp, loff_t *ppos)
2521 {
2522         return -ENOSYS;
2523 }
2524
2525 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2526                   void __user *buffer, size_t *lenp, loff_t *ppos)
2527 {
2528         return -ENOSYS;
2529 }
2530
2531 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2532                     void __user *buffer, size_t *lenp, loff_t *ppos)
2533 {
2534         return -ENOSYS;
2535 }
2536
2537 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2538                     void __user *buffer, size_t *lenp, loff_t *ppos)
2539 {
2540         return -ENOSYS;
2541 }
2542
2543 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2544                     void __user *buffer, size_t *lenp, loff_t *ppos)
2545 {
2546         return -ENOSYS;
2547 }
2548
2549 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2550                              void __user *buffer, size_t *lenp, loff_t *ppos)
2551 {
2552         return -ENOSYS;
2553 }
2554
2555 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2556                     void __user *buffer, size_t *lenp, loff_t *ppos)
2557 {
2558         return -ENOSYS;
2559 }
2560
2561 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2562                                       struct file *filp,
2563                                       void __user *buffer,
2564                                       size_t *lenp, loff_t *ppos)
2565 {
2566     return -ENOSYS;
2567 }
2568
2569
2570 #endif /* CONFIG_PROC_FS */
2571
2572
2573 #ifdef CONFIG_SYSCTL_SYSCALL
2574 /*
2575  * General sysctl support routines
2576  */
2577
2578 /* The generic sysctl data routine (used if no strategy routine supplied) */
2579 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2580                 void __user *oldval, size_t __user *oldlenp,
2581                 void __user *newval, size_t newlen)
2582 {
2583         size_t len;
2584
2585         /* Get out of I don't have a variable */
2586         if (!table->data || !table->maxlen)
2587                 return -ENOTDIR;
2588
2589         if (oldval && oldlenp) {
2590                 if (get_user(len, oldlenp))
2591                         return -EFAULT;
2592                 if (len) {
2593                         if (len > table->maxlen)
2594                                 len = table->maxlen;
2595                         if (copy_to_user(oldval, table->data, len))
2596                                 return -EFAULT;
2597                         if (put_user(len, oldlenp))
2598                                 return -EFAULT;
2599                 }
2600         }
2601
2602         if (newval && newlen) {
2603                 if (newlen > table->maxlen)
2604                         newlen = table->maxlen;
2605
2606                 if (copy_from_user(table->data, newval, newlen))
2607                         return -EFAULT;
2608         }
2609         return 1;
2610 }
2611
2612 /* The generic string strategy routine: */
2613 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2614                   void __user *oldval, size_t __user *oldlenp,
2615                   void __user *newval, size_t newlen)
2616 {
2617         if (!table->data || !table->maxlen)
2618                 return -ENOTDIR;
2619
2620         if (oldval && oldlenp) {
2621                 size_t bufsize;
2622                 if (get_user(bufsize, oldlenp))
2623                         return -EFAULT;
2624                 if (bufsize) {
2625                         size_t len = strlen(table->data), copied;
2626
2627                         /* This shouldn't trigger for a well-formed sysctl */
2628                         if (len > table->maxlen)
2629                                 len = table->maxlen;
2630
2631                         /* Copy up to a max of bufsize-1 bytes of the string */
2632                         copied = (len >= bufsize) ? bufsize - 1 : len;
2633
2634                         if (copy_to_user(oldval, table->data, copied) ||
2635                             put_user(0, (char __user *)(oldval + copied)))
2636                                 return -EFAULT;
2637                         if (put_user(len, oldlenp))
2638                                 return -EFAULT;
2639                 }
2640         }
2641         if (newval && newlen) {
2642                 size_t len = newlen;
2643                 if (len > table->maxlen)
2644                         len = table->maxlen;
2645                 if(copy_from_user(table->data, newval, len))
2646                         return -EFAULT;
2647                 if (len == table->maxlen)
2648                         len--;
2649                 ((char *) table->data)[len] = 0;
2650         }
2651         return 1;
2652 }
2653
2654 /*
2655  * This function makes sure that all of the integers in the vector
2656  * are between the minimum and maximum values given in the arrays
2657  * table->extra1 and table->extra2, respectively.
2658  */
2659 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2660                 void __user *oldval, size_t __user *oldlenp,
2661                 void __user *newval, size_t newlen)
2662 {
2663
2664         if (newval && newlen) {
2665                 int __user *vec = (int __user *) newval;
2666                 int *min = (int *) table->extra1;
2667                 int *max = (int *) table->extra2;
2668                 size_t length;
2669                 int i;
2670
2671                 if (newlen % sizeof(int) != 0)
2672                         return -EINVAL;
2673
2674                 if (!table->extra1 && !table->extra2)
2675                         return 0;
2676
2677                 if (newlen > table->maxlen)
2678                         newlen = table->maxlen;
2679                 length = newlen / sizeof(int);
2680
2681                 for (i = 0; i < length; i++) {
2682                         int value;
2683                         if (get_user(value, vec + i))
2684                                 return -EFAULT;
2685                         if (min && value < min[i])
2686                                 return -EINVAL;
2687                         if (max && value > max[i])
2688                                 return -EINVAL;
2689                 }
2690         }
2691         return 0;
2692 }
2693
2694 /* Strategy function to convert jiffies to seconds */
2695 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2696                 void __user *oldval, size_t __user *oldlenp,
2697                 void __user *newval, size_t newlen)
2698 {
2699         if (oldval && oldlenp) {
2700                 size_t olen;
2701
2702                 if (get_user(olen, oldlenp))
2703                         return -EFAULT;
2704                 if (olen) {
2705                         int val;
2706
2707                         if (olen < sizeof(int))
2708                                 return -EINVAL;
2709
2710                         val = *(int *)(table->data) / HZ;
2711                         if (put_user(val, (int __user *)oldval))
2712                                 return -EFAULT;
2713                         if (put_user(sizeof(int), oldlenp))
2714                                 return -EFAULT;
2715                 }
2716         }
2717         if (newval && newlen) {
2718                 int new;
2719                 if (newlen != sizeof(int))
2720                         return -EINVAL;
2721                 if (get_user(new, (int __user *)newval))
2722                         return -EFAULT;
2723                 *(int *)(table->data) = new*HZ;
2724         }
2725         return 1;
2726 }
2727
2728 /* Strategy function to convert jiffies to seconds */
2729 int sysctl_ms_jiffies(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         if (oldval && oldlenp) {
2734                 size_t olen;
2735
2736                 if (get_user(olen, oldlenp))
2737                         return -EFAULT;
2738                 if (olen) {
2739                         int val;
2740
2741                         if (olen < sizeof(int))
2742                                 return -EINVAL;
2743
2744                         val = jiffies_to_msecs(*(int *)(table->data));
2745                         if (put_user(val, (int __user *)oldval))
2746                                 return -EFAULT;
2747                         if (put_user(sizeof(int), oldlenp))
2748                                 return -EFAULT;
2749                 }
2750         }
2751         if (newval && newlen) {
2752                 int new;
2753                 if (newlen != sizeof(int))
2754                         return -EINVAL;
2755                 if (get_user(new, (int __user *)newval))
2756                         return -EFAULT;
2757                 *(int *)(table->data) = msecs_to_jiffies(new);
2758         }
2759         return 1;
2760 }
2761
2762
2763
2764 #else /* CONFIG_SYSCTL_SYSCALL */
2765
2766
2767 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2768 {
2769         struct __sysctl_args tmp;
2770         int error;
2771
2772         if (copy_from_user(&tmp, args, sizeof(tmp)))
2773                 return -EFAULT;
2774
2775         error = deprecated_sysctl_warning(&tmp);
2776
2777         /* If no error reading the parameters then just -ENOSYS ... */
2778         if (!error)
2779                 error = -ENOSYS;
2780
2781         return error;
2782 }
2783
2784 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2785                   void __user *oldval, size_t __user *oldlenp,
2786                   void __user *newval, size_t newlen)
2787 {
2788         return -ENOSYS;
2789 }
2790
2791 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2792                   void __user *oldval, size_t __user *oldlenp,
2793                   void __user *newval, size_t newlen)
2794 {
2795         return -ENOSYS;
2796 }
2797
2798 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2799                 void __user *oldval, size_t __user *oldlenp,
2800                 void __user *newval, size_t newlen)
2801 {
2802         return -ENOSYS;
2803 }
2804
2805 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2806                 void __user *oldval, size_t __user *oldlenp,
2807                 void __user *newval, size_t newlen)
2808 {
2809         return -ENOSYS;
2810 }
2811
2812 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2813                 void __user *oldval, size_t __user *oldlenp,
2814                 void __user *newval, size_t newlen)
2815 {
2816         return -ENOSYS;
2817 }
2818
2819 #endif /* CONFIG_SYSCTL_SYSCALL */
2820
2821 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2822 {
2823         static int msg_count;
2824         int name[CTL_MAXNAME];
2825         int i;
2826
2827         /* Check args->nlen. */
2828         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2829                 return -ENOTDIR;
2830
2831         /* Read in the sysctl name for better debug message logging */
2832         for (i = 0; i < args->nlen; i++)
2833                 if (get_user(name[i], args->name + i))
2834                         return -EFAULT;
2835
2836         /* Ignore accesses to kernel.version */
2837         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2838                 return 0;
2839
2840         if (msg_count < 5) {
2841                 msg_count++;
2842                 printk(KERN_INFO
2843                         "warning: process `%s' used the deprecated sysctl "
2844                         "system call with ", current->comm);
2845                 for (i = 0; i < args->nlen; i++)
2846                         printk("%d.", name[i]);
2847                 printk("\n");
2848         }
2849         return 0;
2850 }
2851
2852 /*
2853  * No sense putting this after each symbol definition, twice,
2854  * exception granted :-)
2855  */
2856 EXPORT_SYMBOL(proc_dointvec);
2857 EXPORT_SYMBOL(proc_dointvec_jiffies);
2858 EXPORT_SYMBOL(proc_dointvec_minmax);
2859 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2860 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2861 EXPORT_SYMBOL(proc_dostring);
2862 EXPORT_SYMBOL(proc_doulongvec_minmax);
2863 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2864 EXPORT_SYMBOL(register_sysctl_table);
2865 EXPORT_SYMBOL(register_sysctl_paths);
2866 EXPORT_SYMBOL(sysctl_intvec);
2867 EXPORT_SYMBOL(sysctl_jiffies);
2868 EXPORT_SYMBOL(sysctl_ms_jiffies);
2869 EXPORT_SYMBOL(sysctl_string);
2870 EXPORT_SYMBOL(sysctl_data);
2871 EXPORT_SYMBOL(unregister_sysctl_table);