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

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