kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/key.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49 #include <linux/ftrace.h>
  50
  51 #include <asm/uaccess.h>
  52 #include <asm/processor.h>
  53
  54 #ifdef CONFIG_X86
  55 #include <asm/nmi.h>
  56 #include <asm/stacktrace.h>
  57 #include <asm/io.h>
  58 #endif
  59
  60 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  61
  62 #if defined(CONFIG_SYSCTL)
  63
  64 /* External variables not in a header file. */
  65 extern int C_A_D;
  66 extern int print_fatal_signals;
  67 extern int sysctl_overcommit_memory;
  68 extern int sysctl_overcommit_ratio;
  69 extern int sysctl_panic_on_oom;
  70 extern int sysctl_oom_kill_allocating_task;
  71 extern int sysctl_oom_dump_tasks;
  72 extern int max_threads;
  73 extern int core_uses_pid;
  74 extern int suid_dumpable;
  75 extern char core_pattern[];
  76 extern int pid_max;
  77 extern int min_free_kbytes;
  78 extern int pid_max_min, pid_max_max;
  79 extern int sysctl_drop_caches;
  80 extern int percpu_pagelist_fraction;
  81 extern int compat_log;
  82 extern int maps_protect;
  83 extern int sysctl_stat_interval;
  84 extern int latencytop_enabled;
  85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  86
  87 /* Constants used for minimum and  maximum */
  88 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
  89 static int one = 1;
  90 #endif
  91
  92 #ifdef CONFIG_DETECT_SOFTLOCKUP
  93 static int sixty = 60;
  94 static int neg_one = -1;
  95 #endif
  96
  97 #ifdef CONFIG_MMU
  98 static int two = 2;
  99 #endif
 100
 101 static int zero;
 102 static int one_hundred = 100;
 103
 104 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 105 static int maxolduid = 65535;
 106 static int minolduid;
 107 static int min_percpu_pagelist_fract = 8;
 108
 109 static int ngroups_max = NGROUPS_MAX;
 110
 111 #ifdef CONFIG_KMOD
 112 extern char modprobe_path[];
 113 #endif
 114 #ifdef CONFIG_CHR_DEV_SG
 115 extern int sg_big_buff;
 116 #endif
 117
 118 #ifdef __sparc__
 119 extern char reboot_command [];
 120 extern int stop_a_enabled;
 121 extern int scons_pwroff;
 122 #endif
 123
 124 #ifdef __hppa__
 125 extern int pwrsw_enabled;
 126 extern int unaligned_enabled;
 127 #endif
 128
 129 #ifdef CONFIG_S390
 130 #ifdef CONFIG_MATHEMU
 131 extern int sysctl_ieee_emulation_warnings;
 132 #endif
 133 extern int sysctl_userprocess_debug;
 134 extern int spin_retry;
 135 #endif
 136
 137 #ifdef CONFIG_BSD_PROCESS_ACCT
 138 extern int acct_parm[];
 139 #endif
 140
 141 #ifdef CONFIG_IA64
 142 extern int no_unaligned_warning;
 143 #endif
 144
 145 #ifdef CONFIG_RT_MUTEXES
 146 extern int max_lock_depth;
 147 #endif
 148
 149 #ifdef CONFIG_PROC_SYSCTL
 150 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 151                   void __user *buffer, size_t *lenp, loff_t *ppos);
 152 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 153                                void __user *buffer, size_t *lenp, loff_t *ppos);
 154 #endif
 155
 156 static struct ctl_table root_table[];
 157 static struct ctl_table_root sysctl_table_root;
 158 static struct ctl_table_header root_table_header = {
 159         .ctl_table = root_table,
 160         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 161         .root = &sysctl_table_root,
 162 };
 163 static struct ctl_table_root sysctl_table_root = {
 164         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 165         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 166 };
 167
 168 static struct ctl_table kern_table[];
 169 static struct ctl_table vm_table[];
 170 static struct ctl_table fs_table[];
 171 static struct ctl_table debug_table[];
 172 static struct ctl_table dev_table[];
 173 extern struct ctl_table random_table[];
 174 #ifdef CONFIG_INOTIFY_USER
 175 extern struct ctl_table inotify_table[];
 176 #endif
 177
 178 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 179 int sysctl_legacy_va_layout;
 180 #endif
 181
 182 extern int prove_locking;
 183 extern int lock_stat;
 184
 185 /* The default sysctl tables: */
 186
 187 static struct ctl_table root_table[] = {
 188         {
 189                 .ctl_name       = CTL_KERN,
 190                 .procname       = "kernel",
 191                 .mode           = 0555,
 192                 .child          = kern_table,
 193         },
 194         {
 195                 .ctl_name       = CTL_VM,
 196                 .procname       = "vm",
 197                 .mode           = 0555,
 198                 .child          = vm_table,
 199         },
 200         {
 201                 .ctl_name       = CTL_FS,
 202                 .procname       = "fs",
 203                 .mode           = 0555,
 204                 .child          = fs_table,
 205         },
 206         {
 207                 .ctl_name       = CTL_DEBUG,
 208                 .procname       = "debug",
 209                 .mode           = 0555,
 210                 .child          = debug_table,
 211         },
 212         {
 213                 .ctl_name       = CTL_DEV,
 214                 .procname       = "dev",
 215                 .mode           = 0555,
 216                 .child          = dev_table,
 217         },
 218 /*
 219  * NOTE: do not add new entries to this table unless you have read
 220  * Documentation/sysctl/ctl_unnumbered.txt
 221  */
 222         { .ctl_name = 0 }
 223 };
 224
 225 #ifdef CONFIG_SCHED_DEBUG
 226 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 227 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 228 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 229 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 230 #endif
 231
 232 static struct ctl_table kern_table[] = {
 233 #ifdef CONFIG_SCHED_DEBUG
 234         {
 235                 .ctl_name       = CTL_UNNUMBERED,
 236                 .procname       = "sched_min_granularity_ns",
 237                 .data           = &sysctl_sched_min_granularity,
 238                 .maxlen         = sizeof(unsigned int),
 239                 .mode           = 0644,
 240                 .proc_handler   = &sched_nr_latency_handler,
 241                 .strategy       = &sysctl_intvec,
 242                 .extra1         = &min_sched_granularity_ns,
 243                 .extra2         = &max_sched_granularity_ns,
 244         },
 245         {
 246                 .ctl_name       = CTL_UNNUMBERED,
 247                 .procname       = "sched_latency_ns",
 248                 .data           = &sysctl_sched_latency,
 249                 .maxlen         = sizeof(unsigned int),
 250                 .mode           = 0644,
 251                 .proc_handler   = &sched_nr_latency_handler,
 252                 .strategy       = &sysctl_intvec,
 253                 .extra1         = &min_sched_granularity_ns,
 254                 .extra2         = &max_sched_granularity_ns,
 255         },
 256         {
 257                 .ctl_name       = CTL_UNNUMBERED,
 258                 .procname       = "sched_wakeup_granularity_ns",
 259                 .data           = &sysctl_sched_wakeup_granularity,
 260                 .maxlen         = sizeof(unsigned int),
 261                 .mode           = 0644,
 262                 .proc_handler   = &proc_dointvec_minmax,
 263                 .strategy       = &sysctl_intvec,
 264                 .extra1         = &min_wakeup_granularity_ns,
 265                 .extra2         = &max_wakeup_granularity_ns,
 266         },
 267         {
 268                 .ctl_name       = CTL_UNNUMBERED,
 269                 .procname       = "sched_shares_ratelimit",
 270                 .data           = &sysctl_sched_shares_ratelimit,
 271                 .maxlen         = sizeof(unsigned int),
 272                 .mode           = 0644,
 273                 .proc_handler   = &proc_dointvec,
 274         },
 275         {
 276                 .ctl_name       = CTL_UNNUMBERED,
 277                 .procname       = "sched_child_runs_first",
 278                 .data           = &sysctl_sched_child_runs_first,
 279                 .maxlen         = sizeof(unsigned int),
 280                 .mode           = 0644,
 281                 .proc_handler   = &proc_dointvec,
 282         },
 283         {
 284                 .ctl_name       = CTL_UNNUMBERED,
 285                 .procname       = "sched_features",
 286                 .data           = &sysctl_sched_features,
 287                 .maxlen         = sizeof(unsigned int),
 288                 .mode           = 0644,
 289                 .proc_handler   = &proc_dointvec,
 290         },
 291         {
 292                 .ctl_name       = CTL_UNNUMBERED,
 293                 .procname       = "sched_migration_cost",
 294                 .data           = &sysctl_sched_migration_cost,
 295                 .maxlen         = sizeof(unsigned int),
 296                 .mode           = 0644,
 297                 .proc_handler   = &proc_dointvec,
 298         },
 299         {
 300                 .ctl_name       = CTL_UNNUMBERED,
 301                 .procname       = "sched_nr_migrate",
 302                 .data           = &sysctl_sched_nr_migrate,
 303                 .maxlen         = sizeof(unsigned int),
 304                 .mode           = 0644,
 305                 .proc_handler   = &proc_dointvec,
 306         },
 307 #endif
 308         {
 309                 .ctl_name       = CTL_UNNUMBERED,
 310                 .procname       = "sched_rt_period_us",
 311                 .data           = &sysctl_sched_rt_period,
 312                 .maxlen         = sizeof(unsigned int),
 313                 .mode           = 0644,
 314                 .proc_handler   = &sched_rt_handler,
 315         },
 316         {
 317                 .ctl_name       = CTL_UNNUMBERED,
 318                 .procname       = "sched_rt_runtime_us",
 319                 .data           = &sysctl_sched_rt_runtime,
 320                 .maxlen         = sizeof(int),
 321                 .mode           = 0644,
 322                 .proc_handler   = &sched_rt_handler,
 323         },
 324         {
 325                 .ctl_name       = CTL_UNNUMBERED,
 326                 .procname       = "sched_compat_yield",
 327                 .data           = &sysctl_sched_compat_yield,
 328                 .maxlen         = sizeof(unsigned int),
 329                 .mode           = 0644,
 330                 .proc_handler   = &proc_dointvec,
 331         },
 332 #ifdef CONFIG_PROVE_LOCKING
 333         {
 334                 .ctl_name       = CTL_UNNUMBERED,
 335                 .procname       = "prove_locking",
 336                 .data           = &prove_locking,
 337                 .maxlen         = sizeof(int),
 338                 .mode           = 0644,
 339                 .proc_handler   = &proc_dointvec,
 340         },
 341 #endif
 342 #ifdef CONFIG_LOCK_STAT
 343         {
 344                 .ctl_name       = CTL_UNNUMBERED,
 345                 .procname       = "lock_stat",
 346                 .data           = &lock_stat,
 347                 .maxlen         = sizeof(int),
 348                 .mode           = 0644,
 349                 .proc_handler   = &proc_dointvec,
 350         },
 351 #endif
 352         {
 353                 .ctl_name       = KERN_PANIC,
 354                 .procname       = "panic",
 355                 .data           = &panic_timeout,
 356                 .maxlen         = sizeof(int),
 357                 .mode           = 0644,
 358                 .proc_handler   = &proc_dointvec,
 359         },
 360         {
 361                 .ctl_name       = KERN_CORE_USES_PID,
 362                 .procname       = "core_uses_pid",
 363                 .data           = &core_uses_pid,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = &proc_dointvec,
 367         },
 368         {
 369                 .ctl_name       = KERN_CORE_PATTERN,
 370                 .procname       = "core_pattern",
 371                 .data           = core_pattern,
 372                 .maxlen         = CORENAME_MAX_SIZE,
 373                 .mode           = 0644,
 374                 .proc_handler   = &proc_dostring,
 375                 .strategy       = &sysctl_string,
 376         },
 377 #ifdef CONFIG_PROC_SYSCTL
 378         {
 379                 .procname       = "tainted",
 380                 .data           = &tainted,
 381                 .maxlen         = sizeof(int),
 382                 .mode           = 0644,
 383                 .proc_handler   = &proc_dointvec_taint,
 384         },
 385 #endif
 386 #ifdef CONFIG_LATENCYTOP
 387         {
 388                 .procname       = "latencytop",
 389                 .data           = &latencytop_enabled,
 390                 .maxlen         = sizeof(int),
 391                 .mode           = 0644,
 392                 .proc_handler   = &proc_dointvec,
 393         },
 394 #endif
 395 #ifdef CONFIG_BLK_DEV_INITRD
 396         {
 397                 .ctl_name       = KERN_REALROOTDEV,
 398                 .procname       = "real-root-dev",
 399                 .data           = &real_root_dev,
 400                 .maxlen         = sizeof(int),
 401                 .mode           = 0644,
 402                 .proc_handler   = &proc_dointvec,
 403         },
 404 #endif
 405         {
 406                 .ctl_name       = CTL_UNNUMBERED,
 407                 .procname       = "print-fatal-signals",
 408                 .data           = &print_fatal_signals,
 409                 .maxlen         = sizeof(int),
 410                 .mode           = 0644,
 411                 .proc_handler   = &proc_dointvec,
 412         },
 413 #ifdef __sparc__
 414         {
 415                 .ctl_name       = KERN_SPARC_REBOOT,
 416                 .procname       = "reboot-cmd",
 417                 .data           = reboot_command,
 418                 .maxlen         = 256,
 419                 .mode           = 0644,
 420                 .proc_handler   = &proc_dostring,
 421                 .strategy       = &sysctl_string,
 422         },
 423         {
 424                 .ctl_name       = KERN_SPARC_STOP_A,
 425                 .procname       = "stop-a",
 426                 .data           = &stop_a_enabled,
 427                 .maxlen         = sizeof (int),
 428                 .mode           = 0644,
 429                 .proc_handler   = &proc_dointvec,
 430         },
 431         {
 432                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 433                 .procname       = "scons-poweroff",
 434                 .data           = &scons_pwroff,
 435                 .maxlen         = sizeof (int),
 436                 .mode           = 0644,
 437                 .proc_handler   = &proc_dointvec,
 438         },
 439 #endif
 440 #ifdef __hppa__
 441         {
 442                 .ctl_name       = KERN_HPPA_PWRSW,
 443                 .procname       = "soft-power",
 444                 .data           = &pwrsw_enabled,
 445                 .maxlen         = sizeof (int),
 446                 .mode           = 0644,
 447                 .proc_handler   = &proc_dointvec,
 448         },
 449         {
 450                 .ctl_name       = KERN_HPPA_UNALIGNED,
 451                 .procname       = "unaligned-trap",
 452                 .data           = &unaligned_enabled,
 453                 .maxlen         = sizeof (int),
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dointvec,
 456         },
 457 #endif
 458         {
 459                 .ctl_name       = KERN_CTLALTDEL,
 460                 .procname       = "ctrl-alt-del",
 461                 .data           = &C_A_D,
 462                 .maxlen         = sizeof(int),
 463                 .mode           = 0644,
 464                 .proc_handler   = &proc_dointvec,
 465         },
 466 #ifdef CONFIG_FTRACE
 467         {
 468                 .ctl_name       = CTL_UNNUMBERED,
 469                 .procname       = "ftrace_enabled",
 470                 .data           = &ftrace_enabled,
 471                 .maxlen         = sizeof(int),
 472                 .mode           = 0644,
 473                 .proc_handler   = &ftrace_enable_sysctl,
 474         },
 475 #endif
 476 #ifdef CONFIG_KMOD
 477         {
 478                 .ctl_name       = KERN_MODPROBE,
 479                 .procname       = "modprobe",
 480                 .data           = &modprobe_path,
 481                 .maxlen         = KMOD_PATH_LEN,
 482                 .mode           = 0644,
 483                 .proc_handler   = &proc_dostring,
 484                 .strategy       = &sysctl_string,
 485         },
 486 #endif
 487 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 488         {
 489                 .ctl_name       = KERN_HOTPLUG,
 490                 .procname       = "hotplug",
 491                 .data           = &uevent_helper,
 492                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 493                 .mode           = 0644,
 494                 .proc_handler   = &proc_dostring,
 495                 .strategy       = &sysctl_string,
 496         },
 497 #endif
 498 #ifdef CONFIG_CHR_DEV_SG
 499         {
 500                 .ctl_name       = KERN_SG_BIG_BUFF,
 501                 .procname       = "sg-big-buff",
 502                 .data           = &sg_big_buff,
 503                 .maxlen         = sizeof (int),
 504                 .mode           = 0444,
 505                 .proc_handler   = &proc_dointvec,
 506         },
 507 #endif
 508 #ifdef CONFIG_BSD_PROCESS_ACCT
 509         {
 510                 .ctl_name       = KERN_ACCT,
 511                 .procname       = "acct",
 512                 .data           = &acct_parm,
 513                 .maxlen         = 3*sizeof(int),
 514                 .mode           = 0644,
 515                 .proc_handler   = &proc_dointvec,
 516         },
 517 #endif
 518 #ifdef CONFIG_MAGIC_SYSRQ
 519         {
 520                 .ctl_name       = KERN_SYSRQ,
 521                 .procname       = "sysrq",
 522                 .data           = &__sysrq_enabled,
 523                 .maxlen         = sizeof (int),
 524                 .mode           = 0644,
 525                 .proc_handler   = &proc_dointvec,
 526         },
 527 #endif
 528 #ifdef CONFIG_PROC_SYSCTL
 529         {
 530                 .procname       = "cad_pid",
 531                 .data           = NULL,
 532                 .maxlen         = sizeof (int),
 533                 .mode           = 0600,
 534                 .proc_handler   = &proc_do_cad_pid,
 535         },
 536 #endif
 537         {
 538                 .ctl_name       = KERN_MAX_THREADS,
 539                 .procname       = "threads-max",
 540                 .data           = &max_threads,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = &proc_dointvec,
 544         },
 545         {
 546                 .ctl_name       = KERN_RANDOM,
 547                 .procname       = "random",
 548                 .mode           = 0555,
 549                 .child          = random_table,
 550         },
 551         {
 552                 .ctl_name       = KERN_OVERFLOWUID,
 553                 .procname       = "overflowuid",
 554                 .data           = &overflowuid,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = &proc_dointvec_minmax,
 558                 .strategy       = &sysctl_intvec,
 559                 .extra1         = &minolduid,
 560                 .extra2         = &maxolduid,
 561         },
 562         {
 563                 .ctl_name       = KERN_OVERFLOWGID,
 564                 .procname       = "overflowgid",
 565                 .data           = &overflowgid,
 566                 .maxlen         = sizeof(int),
 567                 .mode           = 0644,
 568                 .proc_handler   = &proc_dointvec_minmax,
 569                 .strategy       = &sysctl_intvec,
 570                 .extra1         = &minolduid,
 571                 .extra2         = &maxolduid,
 572         },
 573 #ifdef CONFIG_S390
 574 #ifdef CONFIG_MATHEMU
 575         {
 576                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 577                 .procname       = "ieee_emulation_warnings",
 578                 .data           = &sysctl_ieee_emulation_warnings,
 579                 .maxlen         = sizeof(int),
 580                 .mode           = 0644,
 581                 .proc_handler   = &proc_dointvec,
 582         },
 583 #endif
 584         {
 585                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 586                 .procname       = "userprocess_debug",
 587                 .data           = &sysctl_userprocess_debug,
 588                 .maxlen         = sizeof(int),
 589                 .mode           = 0644,
 590                 .proc_handler   = &proc_dointvec,
 591         },
 592 #endif
 593         {
 594                 .ctl_name       = KERN_PIDMAX,
 595                 .procname       = "pid_max",
 596                 .data           = &pid_max,
 597                 .maxlen         = sizeof (int),
 598                 .mode           = 0644,
 599                 .proc_handler   = &proc_dointvec_minmax,
 600                 .strategy       = sysctl_intvec,
 601                 .extra1         = &pid_max_min,
 602                 .extra2         = &pid_max_max,
 603         },
 604         {
 605                 .ctl_name       = KERN_PANIC_ON_OOPS,
 606                 .procname       = "panic_on_oops",
 607                 .data           = &panic_on_oops,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec,
 611         },
 612 #if defined CONFIG_PRINTK
 613         {
 614                 .ctl_name       = KERN_PRINTK,
 615                 .procname       = "printk",
 616                 .data           = &console_loglevel,
 617                 .maxlen         = 4*sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec,
 620         },
 621         {
 622                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 623                 .procname       = "printk_ratelimit",
 624                 .data           = &printk_ratelimit_jiffies,
 625                 .maxlen         = sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = &proc_dointvec_jiffies,
 628                 .strategy       = &sysctl_jiffies,
 629         },
 630         {
 631                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 632                 .procname       = "printk_ratelimit_burst",
 633                 .data           = &printk_ratelimit_burst,
 634                 .maxlen         = sizeof(int),
 635                 .mode           = 0644,
 636                 .proc_handler   = &proc_dointvec,
 637         },
 638 #endif
 639         {
 640                 .ctl_name       = KERN_NGROUPS_MAX,
 641                 .procname       = "ngroups_max",
 642                 .data           = &ngroups_max,
 643                 .maxlen         = sizeof (int),
 644                 .mode           = 0444,
 645                 .proc_handler   = &proc_dointvec,
 646         },
 647 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 648         {
 649                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 650                 .procname       = "unknown_nmi_panic",
 651                 .data           = &unknown_nmi_panic,
 652                 .maxlen         = sizeof (int),
 653                 .mode           = 0644,
 654                 .proc_handler   = &proc_dointvec,
 655         },
 656         {
 657                 .procname       = "nmi_watchdog",
 658                 .data           = &nmi_watchdog_enabled,
 659                 .maxlen         = sizeof (int),
 660                 .mode           = 0644,
 661                 .proc_handler   = &proc_nmi_enabled,
 662         },
 663 #endif
 664 #if defined(CONFIG_X86)
 665         {
 666                 .ctl_name       = KERN_PANIC_ON_NMI,
 667                 .procname       = "panic_on_unrecovered_nmi",
 668                 .data           = &panic_on_unrecovered_nmi,
 669                 .maxlen         = sizeof(int),
 670                 .mode           = 0644,
 671                 .proc_handler   = &proc_dointvec,
 672         },
 673         {
 674                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 675                 .procname       = "bootloader_type",
 676                 .data           = &bootloader_type,
 677                 .maxlen         = sizeof (int),
 678                 .mode           = 0444,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681         {
 682                 .ctl_name       = CTL_UNNUMBERED,
 683                 .procname       = "kstack_depth_to_print",
 684                 .data           = &kstack_depth_to_print,
 685                 .maxlen         = sizeof(int),
 686                 .mode           = 0644,
 687                 .proc_handler   = &proc_dointvec,
 688         },
 689         {
 690                 .ctl_name       = CTL_UNNUMBERED,
 691                 .procname       = "io_delay_type",
 692                 .data           = &io_delay_type,
 693                 .maxlen         = sizeof(int),
 694                 .mode           = 0644,
 695                 .proc_handler   = &proc_dointvec,
 696         },
 697 #endif
 698 #if defined(CONFIG_MMU)
 699         {
 700                 .ctl_name       = KERN_RANDOMIZE,
 701                 .procname       = "randomize_va_space",
 702                 .data           = &randomize_va_space,
 703                 .maxlen         = sizeof(int),
 704                 .mode           = 0644,
 705                 .proc_handler   = &proc_dointvec,
 706         },
 707 #endif
 708 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 709         {
 710                 .ctl_name       = KERN_SPIN_RETRY,
 711                 .procname       = "spin_retry",
 712                 .data           = &spin_retry,
 713                 .maxlen         = sizeof (int),
 714                 .mode           = 0644,
 715                 .proc_handler   = &proc_dointvec,
 716         },
 717 #endif
 718 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 719         {
 720                 .procname       = "acpi_video_flags",
 721                 .data           = &acpi_realmode_flags,
 722                 .maxlen         = sizeof (unsigned long),
 723                 .mode           = 0644,
 724                 .proc_handler   = &proc_doulongvec_minmax,
 725         },
 726 #endif
 727 #ifdef CONFIG_IA64
 728         {
 729                 .ctl_name       = KERN_IA64_UNALIGNED,
 730                 .procname       = "ignore-unaligned-usertrap",
 731                 .data           = &no_unaligned_warning,
 732                 .maxlen         = sizeof (int),
 733                 .mode           = 0644,
 734                 .proc_handler   = &proc_dointvec,
 735         },
 736 #endif
 737 #ifdef CONFIG_DETECT_SOFTLOCKUP
 738         {
 739                 .ctl_name       = CTL_UNNUMBERED,
 740                 .procname       = "softlockup_panic",
 741                 .data           = &softlockup_panic,
 742                 .maxlen         = sizeof(int),
 743                 .mode           = 0644,
 744                 .proc_handler   = &proc_doulongvec_minmax,
 745                 .strategy       = &sysctl_intvec,
 746                 .extra1         = &zero,
 747                 .extra2         = &one,
 748         },
 749         {
 750                 .ctl_name       = CTL_UNNUMBERED,
 751                 .procname       = "softlockup_thresh",
 752                 .data           = &softlockup_thresh,
 753                 .maxlen         = sizeof(int),
 754                 .mode           = 0644,
 755                 .proc_handler   = &proc_dointvec_minmax,
 756                 .strategy       = &sysctl_intvec,
 757                 .extra1         = &neg_one,
 758                 .extra2         = &sixty,
 759         },
 760         {
 761                 .ctl_name       = CTL_UNNUMBERED,
 762                 .procname       = "hung_task_check_count",
 763                 .data           = &sysctl_hung_task_check_count,
 764                 .maxlen         = sizeof(unsigned long),
 765                 .mode           = 0644,
 766                 .proc_handler   = &proc_doulongvec_minmax,
 767                 .strategy       = &sysctl_intvec,
 768         },
 769         {
 770                 .ctl_name       = CTL_UNNUMBERED,
 771                 .procname       = "hung_task_timeout_secs",
 772                 .data           = &sysctl_hung_task_timeout_secs,
 773                 .maxlen         = sizeof(unsigned long),
 774                 .mode           = 0644,
 775                 .proc_handler   = &proc_doulongvec_minmax,
 776                 .strategy       = &sysctl_intvec,
 777         },
 778         {
 779                 .ctl_name       = CTL_UNNUMBERED,
 780                 .procname       = "hung_task_warnings",
 781                 .data           = &sysctl_hung_task_warnings,
 782                 .maxlen         = sizeof(unsigned long),
 783                 .mode           = 0644,
 784                 .proc_handler   = &proc_doulongvec_minmax,
 785                 .strategy       = &sysctl_intvec,
 786         },
 787 #endif
 788 #ifdef CONFIG_COMPAT
 789         {
 790                 .ctl_name       = KERN_COMPAT_LOG,
 791                 .procname       = "compat-log",
 792                 .data           = &compat_log,
 793                 .maxlen         = sizeof (int),
 794                 .mode           = 0644,
 795                 .proc_handler   = &proc_dointvec,
 796         },
 797 #endif
 798 #ifdef CONFIG_RT_MUTEXES
 799         {
 800                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 801                 .procname       = "max_lock_depth",
 802                 .data           = &max_lock_depth,
 803                 .maxlen         = sizeof(int),
 804                 .mode           = 0644,
 805                 .proc_handler   = &proc_dointvec,
 806         },
 807 #endif
 808 #ifdef CONFIG_PROC_FS
 809         {
 810                 .ctl_name       = CTL_UNNUMBERED,
 811                 .procname       = "maps_protect",
 812                 .data           = &maps_protect,
 813                 .maxlen         = sizeof(int),
 814                 .mode           = 0644,
 815                 .proc_handler   = &proc_dointvec,
 816         },
 817 #endif
 818         {
 819                 .ctl_name       = CTL_UNNUMBERED,
 820                 .procname       = "poweroff_cmd",
 821                 .data           = &poweroff_cmd,
 822                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 823                 .mode           = 0644,
 824                 .proc_handler   = &proc_dostring,
 825                 .strategy       = &sysctl_string,
 826         },
 827 #ifdef CONFIG_KEYS
 828         {
 829                 .ctl_name       = CTL_UNNUMBERED,
 830                 .procname       = "keys",
 831                 .mode           = 0555,
 832                 .child          = key_sysctls,
 833         },
 834 #endif
 835 /*
 836  * NOTE: do not add new entries to this table unless you have read
 837  * Documentation/sysctl/ctl_unnumbered.txt
 838  */
 839         { .ctl_name = 0 }
 840 };
 841
 842 static struct ctl_table vm_table[] = {
 843         {
 844                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 845                 .procname       = "overcommit_memory",
 846                 .data           = &sysctl_overcommit_memory,
 847                 .maxlen         = sizeof(sysctl_overcommit_memory),
 848                 .mode           = 0644,
 849                 .proc_handler   = &proc_dointvec,
 850         },
 851         {
 852                 .ctl_name       = VM_PANIC_ON_OOM,
 853                 .procname       = "panic_on_oom",
 854                 .data           = &sysctl_panic_on_oom,
 855                 .maxlen         = sizeof(sysctl_panic_on_oom),
 856                 .mode           = 0644,
 857                 .proc_handler   = &proc_dointvec,
 858         },
 859         {
 860                 .ctl_name       = CTL_UNNUMBERED,
 861                 .procname       = "oom_kill_allocating_task",
 862                 .data           = &sysctl_oom_kill_allocating_task,
 863                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 864                 .mode           = 0644,
 865                 .proc_handler   = &proc_dointvec,
 866         },
 867         {
 868                 .ctl_name       = CTL_UNNUMBERED,
 869                 .procname       = "oom_dump_tasks",
 870                 .data           = &sysctl_oom_dump_tasks,
 871                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 872                 .mode           = 0644,
 873                 .proc_handler   = &proc_dointvec,
 874         },
 875         {
 876                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 877                 .procname       = "overcommit_ratio",
 878                 .data           = &sysctl_overcommit_ratio,
 879                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 880                 .mode           = 0644,
 881                 .proc_handler   = &proc_dointvec,
 882         },
 883         {
 884                 .ctl_name       = VM_PAGE_CLUSTER,
 885                 .procname       = "page-cluster",
 886                 .data           = &page_cluster,
 887                 .maxlen         = sizeof(int),
 888                 .mode           = 0644,
 889                 .proc_handler   = &proc_dointvec,
 890         },
 891         {
 892                 .ctl_name       = VM_DIRTY_BACKGROUND,
 893                 .procname       = "dirty_background_ratio",
 894                 .data           = &dirty_background_ratio,
 895                 .maxlen         = sizeof(dirty_background_ratio),
 896                 .mode           = 0644,
 897                 .proc_handler   = &proc_dointvec_minmax,
 898                 .strategy       = &sysctl_intvec,
 899                 .extra1         = &zero,
 900                 .extra2         = &one_hundred,
 901         },
 902         {
 903                 .ctl_name       = VM_DIRTY_RATIO,
 904                 .procname       = "dirty_ratio",
 905                 .data           = &vm_dirty_ratio,
 906                 .maxlen         = sizeof(vm_dirty_ratio),
 907                 .mode           = 0644,
 908                 .proc_handler   = &dirty_ratio_handler,
 909                 .strategy       = &sysctl_intvec,
 910                 .extra1         = &zero,
 911                 .extra2         = &one_hundred,
 912         },
 913         {
 914                 .procname       = "dirty_writeback_centisecs",
 915                 .data           = &dirty_writeback_interval,
 916                 .maxlen         = sizeof(dirty_writeback_interval),
 917                 .mode           = 0644,
 918                 .proc_handler   = &dirty_writeback_centisecs_handler,
 919         },
 920         {
 921                 .procname       = "dirty_expire_centisecs",
 922                 .data           = &dirty_expire_interval,
 923                 .maxlen         = sizeof(dirty_expire_interval),
 924                 .mode           = 0644,
 925                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 926         },
 927         {
 928                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 929                 .procname       = "nr_pdflush_threads",
 930                 .data           = &nr_pdflush_threads,
 931                 .maxlen         = sizeof nr_pdflush_threads,
 932                 .mode           = 0444 /* read-only*/,
 933                 .proc_handler   = &proc_dointvec,
 934         },
 935         {
 936                 .ctl_name       = VM_SWAPPINESS,
 937                 .procname       = "swappiness",
 938                 .data           = &vm_swappiness,
 939                 .maxlen         = sizeof(vm_swappiness),
 940                 .mode           = 0644,
 941                 .proc_handler   = &proc_dointvec_minmax,
 942                 .strategy       = &sysctl_intvec,
 943                 .extra1         = &zero,
 944                 .extra2         = &one_hundred,
 945         },
 946 #ifdef CONFIG_HUGETLB_PAGE
 947          {
 948                 .procname       = "nr_hugepages",
 949                 .data           = &max_huge_pages,
 950                 .maxlen         = sizeof(unsigned long),
 951                 .mode           = 0644,
 952                 .proc_handler   = &hugetlb_sysctl_handler,
 953                 .extra1         = (void *)&hugetlb_zero,
 954                 .extra2         = (void *)&hugetlb_infinity,
 955          },
 956          {
 957                 .ctl_name       = VM_HUGETLB_GROUP,
 958                 .procname       = "hugetlb_shm_group",
 959                 .data           = &sysctl_hugetlb_shm_group,
 960                 .maxlen         = sizeof(gid_t),
 961                 .mode           = 0644,
 962                 .proc_handler   = &proc_dointvec,
 963          },
 964          {
 965                 .ctl_name       = CTL_UNNUMBERED,
 966                 .procname       = "hugepages_treat_as_movable",
 967                 .data           = &hugepages_treat_as_movable,
 968                 .maxlen         = sizeof(int),
 969                 .mode           = 0644,
 970                 .proc_handler   = &hugetlb_treat_movable_handler,
 971         },
 972         {
 973                 .ctl_name       = CTL_UNNUMBERED,
 974                 .procname       = "nr_overcommit_hugepages",
 975                 .data           = &sysctl_overcommit_huge_pages,
 976                 .maxlen         = sizeof(sysctl_overcommit_huge_pages),
 977                 .mode           = 0644,
 978                 .proc_handler   = &hugetlb_overcommit_handler,
 979         },
 980 #endif
 981         {
 982                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 983                 .procname       = "lowmem_reserve_ratio",
 984                 .data           = &sysctl_lowmem_reserve_ratio,
 985                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 986                 .mode           = 0644,
 987                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 988                 .strategy       = &sysctl_intvec,
 989         },
 990         {
 991                 .ctl_name       = VM_DROP_PAGECACHE,
 992                 .procname       = "drop_caches",
 993                 .data           = &sysctl_drop_caches,
 994                 .maxlen         = sizeof(int),
 995                 .mode           = 0644,
 996                 .proc_handler   = drop_caches_sysctl_handler,
 997                 .strategy       = &sysctl_intvec,
 998         },
 999         {
1000                 .ctl_name       = VM_MIN_FREE_KBYTES,
1001                 .procname       = "min_free_kbytes",
1002                 .data           = &min_free_kbytes,
1003                 .maxlen         = sizeof(min_free_kbytes),
1004                 .mode           = 0644,
1005                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1006                 .strategy       = &sysctl_intvec,
1007                 .extra1         = &zero,
1008         },
1009         {
1010                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1011                 .procname       = "percpu_pagelist_fraction",
1012                 .data           = &percpu_pagelist_fraction,
1013                 .maxlen         = sizeof(percpu_pagelist_fraction),
1014                 .mode           = 0644,
1015                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1016                 .strategy       = &sysctl_intvec,
1017                 .extra1         = &min_percpu_pagelist_fract,
1018         },
1019 #ifdef CONFIG_MMU
1020         {
1021                 .ctl_name       = VM_MAX_MAP_COUNT,
1022                 .procname       = "max_map_count",
1023                 .data           = &sysctl_max_map_count,
1024                 .maxlen         = sizeof(sysctl_max_map_count),
1025                 .mode           = 0644,
1026                 .proc_handler   = &proc_dointvec
1027         },
1028 #endif
1029         {
1030                 .ctl_name       = VM_LAPTOP_MODE,
1031                 .procname       = "laptop_mode",
1032                 .data           = &laptop_mode,
1033                 .maxlen         = sizeof(laptop_mode),
1034                 .mode           = 0644,
1035                 .proc_handler   = &proc_dointvec_jiffies,
1036                 .strategy       = &sysctl_jiffies,
1037         },
1038         {
1039                 .ctl_name       = VM_BLOCK_DUMP,
1040                 .procname       = "block_dump",
1041                 .data           = &block_dump,
1042                 .maxlen         = sizeof(block_dump),
1043                 .mode           = 0644,
1044                 .proc_handler   = &proc_dointvec,
1045                 .strategy       = &sysctl_intvec,
1046                 .extra1         = &zero,
1047         },
1048         {
1049                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1050                 .procname       = "vfs_cache_pressure",
1051                 .data           = &sysctl_vfs_cache_pressure,
1052                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1053                 .mode           = 0644,
1054                 .proc_handler   = &proc_dointvec,
1055                 .strategy       = &sysctl_intvec,
1056                 .extra1         = &zero,
1057         },
1058 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1059         {
1060                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1061                 .procname       = "legacy_va_layout",
1062                 .data           = &sysctl_legacy_va_layout,
1063                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1064                 .mode           = 0644,
1065                 .proc_handler   = &proc_dointvec,
1066                 .strategy       = &sysctl_intvec,
1067                 .extra1         = &zero,
1068         },
1069 #endif
1070 #ifdef CONFIG_NUMA
1071         {
1072                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1073                 .procname       = "zone_reclaim_mode",
1074                 .data           = &zone_reclaim_mode,
1075                 .maxlen         = sizeof(zone_reclaim_mode),
1076                 .mode           = 0644,
1077                 .proc_handler   = &proc_dointvec,
1078                 .strategy       = &sysctl_intvec,
1079                 .extra1         = &zero,
1080         },
1081         {
1082                 .ctl_name       = VM_MIN_UNMAPPED,
1083                 .procname       = "min_unmapped_ratio",
1084                 .data           = &sysctl_min_unmapped_ratio,
1085                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1086                 .mode           = 0644,
1087                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1088                 .strategy       = &sysctl_intvec,
1089                 .extra1         = &zero,
1090                 .extra2         = &one_hundred,
1091         },
1092         {
1093                 .ctl_name       = VM_MIN_SLAB,
1094                 .procname       = "min_slab_ratio",
1095                 .data           = &sysctl_min_slab_ratio,
1096                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1097                 .mode           = 0644,
1098                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1099                 .strategy       = &sysctl_intvec,
1100                 .extra1         = &zero,
1101                 .extra2         = &one_hundred,
1102         },
1103 #endif
1104 #ifdef CONFIG_SMP
1105         {
1106                 .ctl_name       = CTL_UNNUMBERED,
1107                 .procname       = "stat_interval",
1108                 .data           = &sysctl_stat_interval,
1109                 .maxlen         = sizeof(sysctl_stat_interval),
1110                 .mode           = 0644,
1111                 .proc_handler   = &proc_dointvec_jiffies,
1112                 .strategy       = &sysctl_jiffies,
1113         },
1114 #endif
1115 #ifdef CONFIG_SECURITY
1116         {
1117                 .ctl_name       = CTL_UNNUMBERED,
1118                 .procname       = "mmap_min_addr",
1119                 .data           = &mmap_min_addr,
1120                 .maxlen         = sizeof(unsigned long),
1121                 .mode           = 0644,
1122                 .proc_handler   = &proc_doulongvec_minmax,
1123         },
1124 #endif
1125 #ifdef CONFIG_NUMA
1126         {
1127                 .ctl_name       = CTL_UNNUMBERED,
1128                 .procname       = "numa_zonelist_order",
1129                 .data           = &numa_zonelist_order,
1130                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1131                 .mode           = 0644,
1132                 .proc_handler   = &numa_zonelist_order_handler,
1133                 .strategy       = &sysctl_string,
1134         },
1135 #endif
1136 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1137    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1138         {
1139                 .ctl_name       = VM_VDSO_ENABLED,
1140                 .procname       = "vdso_enabled",
1141                 .data           = &vdso_enabled,
1142                 .maxlen         = sizeof(vdso_enabled),
1143                 .mode           = 0644,
1144                 .proc_handler   = &proc_dointvec,
1145                 .strategy       = &sysctl_intvec,
1146                 .extra1         = &zero,
1147         },
1148 #endif
1149 #ifdef CONFIG_HIGHMEM
1150         {
1151                 .ctl_name       = CTL_UNNUMBERED,
1152                 .procname       = "highmem_is_dirtyable",
1153                 .data           = &vm_highmem_is_dirtyable,
1154                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1155                 .mode           = 0644,
1156                 .proc_handler   = &proc_dointvec_minmax,
1157                 .strategy       = &sysctl_intvec,
1158                 .extra1         = &zero,
1159                 .extra2         = &one,
1160         },
1161 #endif
1162 /*
1163  * NOTE: do not add new entries to this table unless you have read
1164  * Documentation/sysctl/ctl_unnumbered.txt
1165  */
1166         { .ctl_name = 0 }
1167 };
1168
1169 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1170 static struct ctl_table binfmt_misc_table[] = {
1171         { .ctl_name = 0 }
1172 };
1173 #endif
1174
1175 static struct ctl_table fs_table[] = {
1176         {
1177                 .ctl_name       = FS_NRINODE,
1178                 .procname       = "inode-nr",
1179                 .data           = &inodes_stat,
1180                 .maxlen         = 2*sizeof(int),
1181                 .mode           = 0444,
1182                 .proc_handler   = &proc_dointvec,
1183         },
1184         {
1185                 .ctl_name       = FS_STATINODE,
1186                 .procname       = "inode-state",
1187                 .data           = &inodes_stat,
1188                 .maxlen         = 7*sizeof(int),
1189                 .mode           = 0444,
1190                 .proc_handler   = &proc_dointvec,
1191         },
1192         {
1193                 .procname       = "file-nr",
1194                 .data           = &files_stat,
1195                 .maxlen         = 3*sizeof(int),
1196                 .mode           = 0444,
1197                 .proc_handler   = &proc_nr_files,
1198         },
1199         {
1200                 .ctl_name       = FS_MAXFILE,
1201                 .procname       = "file-max",
1202                 .data           = &files_stat.max_files,
1203                 .maxlen         = sizeof(int),
1204                 .mode           = 0644,
1205                 .proc_handler   = &proc_dointvec,
1206         },
1207         {
1208                 .ctl_name       = CTL_UNNUMBERED,
1209                 .procname       = "nr_open",
1210                 .data           = &sysctl_nr_open,
1211                 .maxlen         = sizeof(int),
1212                 .mode           = 0644,
1213                 .proc_handler   = &proc_dointvec_minmax,
1214                 .extra1         = &sysctl_nr_open_min,
1215                 .extra2         = &sysctl_nr_open_max,
1216         },
1217         {
1218                 .ctl_name       = FS_DENTRY,
1219                 .procname       = "dentry-state",
1220                 .data           = &dentry_stat,
1221                 .maxlen         = 6*sizeof(int),
1222                 .mode           = 0444,
1223                 .proc_handler   = &proc_dointvec,
1224         },
1225         {
1226                 .ctl_name       = FS_OVERFLOWUID,
1227                 .procname       = "overflowuid",
1228                 .data           = &fs_overflowuid,
1229                 .maxlen         = sizeof(int),
1230                 .mode           = 0644,
1231                 .proc_handler   = &proc_dointvec_minmax,
1232                 .strategy       = &sysctl_intvec,
1233                 .extra1         = &minolduid,
1234                 .extra2         = &maxolduid,
1235         },
1236         {
1237                 .ctl_name       = FS_OVERFLOWGID,
1238                 .procname       = "overflowgid",
1239                 .data           = &fs_overflowgid,
1240                 .maxlen         = sizeof(int),
1241                 .mode           = 0644,
1242                 .proc_handler   = &proc_dointvec_minmax,
1243                 .strategy       = &sysctl_intvec,
1244                 .extra1         = &minolduid,
1245                 .extra2         = &maxolduid,
1246         },
1247         {
1248                 .ctl_name       = FS_LEASES,
1249                 .procname       = "leases-enable",
1250                 .data           = &leases_enable,
1251                 .maxlen         = sizeof(int),
1252                 .mode           = 0644,
1253                 .proc_handler   = &proc_dointvec,
1254         },
1255 #ifdef CONFIG_DNOTIFY
1256         {
1257                 .ctl_name       = FS_DIR_NOTIFY,
1258                 .procname       = "dir-notify-enable",
1259                 .data           = &dir_notify_enable,
1260                 .maxlen         = sizeof(int),
1261                 .mode           = 0644,
1262                 .proc_handler   = &proc_dointvec,
1263         },
1264 #endif
1265 #ifdef CONFIG_MMU
1266         {
1267                 .ctl_name       = FS_LEASE_TIME,
1268                 .procname       = "lease-break-time",
1269                 .data           = &lease_break_time,
1270                 .maxlen         = sizeof(int),
1271                 .mode           = 0644,
1272                 .proc_handler   = &proc_dointvec_minmax,
1273                 .strategy       = &sysctl_intvec,
1274                 .extra1         = &zero,
1275                 .extra2         = &two,
1276         },
1277         {
1278                 .procname       = "aio-nr",
1279                 .data           = &aio_nr,
1280                 .maxlen         = sizeof(aio_nr),
1281                 .mode           = 0444,
1282                 .proc_handler   = &proc_doulongvec_minmax,
1283         },
1284         {
1285                 .procname       = "aio-max-nr",
1286                 .data           = &aio_max_nr,
1287                 .maxlen         = sizeof(aio_max_nr),
1288                 .mode           = 0644,
1289                 .proc_handler   = &proc_doulongvec_minmax,
1290         },
1291 #ifdef CONFIG_INOTIFY_USER
1292         {
1293                 .ctl_name       = FS_INOTIFY,
1294                 .procname       = "inotify",
1295                 .mode           = 0555,
1296                 .child          = inotify_table,
1297         },
1298 #endif
1299 #endif
1300         {
1301                 .ctl_name       = KERN_SETUID_DUMPABLE,
1302                 .procname       = "suid_dumpable",
1303                 .data           = &suid_dumpable,
1304                 .maxlen         = sizeof(int),
1305                 .mode           = 0644,
1306                 .proc_handler   = &proc_dointvec,
1307         },
1308 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1309         {
1310                 .ctl_name       = CTL_UNNUMBERED,
1311                 .procname       = "binfmt_misc",
1312                 .mode           = 0555,
1313                 .child          = binfmt_misc_table,
1314         },
1315 #endif
1316 /*
1317  * NOTE: do not add new entries to this table unless you have read
1318  * Documentation/sysctl/ctl_unnumbered.txt
1319  */
1320         { .ctl_name = 0 }
1321 };
1322
1323 static struct ctl_table debug_table[] = {
1324 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1325         {
1326                 .ctl_name       = CTL_UNNUMBERED,
1327                 .procname       = "exception-trace",
1328                 .data           = &show_unhandled_signals,
1329                 .maxlen         = sizeof(int),
1330                 .mode           = 0644,
1331                 .proc_handler   = proc_dointvec
1332         },
1333 #endif
1334         { .ctl_name = 0 }
1335 };
1336
1337 static struct ctl_table dev_table[] = {
1338         { .ctl_name = 0 }
1339 };
1340
1341 static DEFINE_SPINLOCK(sysctl_lock);
1342
1343 /* called under sysctl_lock */
1344 static int use_table(struct ctl_table_header *p)
1345 {
1346         if (unlikely(p->unregistering))
1347                 return 0;
1348         p->used++;
1349         return 1;
1350 }
1351
1352 /* called under sysctl_lock */
1353 static void unuse_table(struct ctl_table_header *p)
1354 {
1355         if (!--p->used)
1356                 if (unlikely(p->unregistering))
1357                         complete(p->unregistering);
1358 }
1359
1360 /* called under sysctl_lock, will reacquire if has to wait */
1361 static void start_unregistering(struct ctl_table_header *p)
1362 {
1363         /*
1364          * if p->used is 0, nobody will ever touch that entry again;
1365          * we'll eliminate all paths to it before dropping sysctl_lock
1366          */
1367         if (unlikely(p->used)) {
1368                 struct completion wait;
1369                 init_completion(&wait);
1370                 p->unregistering = &wait;
1371                 spin_unlock(&sysctl_lock);
1372                 wait_for_completion(&wait);
1373                 spin_lock(&sysctl_lock);
1374         }
1375         /*
1376          * do not remove from the list until nobody holds it; walking the
1377          * list in do_sysctl() relies on that.
1378          */
1379         list_del_init(&p->ctl_entry);
1380 }
1381
1382 void sysctl_head_finish(struct ctl_table_header *head)
1383 {
1384         if (!head)
1385                 return;
1386         spin_lock(&sysctl_lock);
1387         unuse_table(head);
1388         spin_unlock(&sysctl_lock);
1389 }
1390
1391 static struct list_head *
1392 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1393 {
1394         struct list_head *header_list;
1395         header_list = &root->header_list;
1396         if (root->lookup)
1397                 header_list = root->lookup(root, namespaces);
1398         return header_list;
1399 }
1400
1401 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1402                                             struct ctl_table_header *prev)
1403 {
1404         struct ctl_table_root *root;
1405         struct list_head *header_list;
1406         struct ctl_table_header *head;
1407         struct list_head *tmp;
1408
1409         spin_lock(&sysctl_lock);
1410         if (prev) {
1411                 head = prev;
1412                 tmp = &prev->ctl_entry;
1413                 unuse_table(prev);
1414                 goto next;
1415         }
1416         tmp = &root_table_header.ctl_entry;
1417         for (;;) {
1418                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1419
1420                 if (!use_table(head))
1421                         goto next;
1422                 spin_unlock(&sysctl_lock);
1423                 return head;
1424         next:
1425                 root = head->root;
1426                 tmp = tmp->next;
1427                 header_list = lookup_header_list(root, namespaces);
1428                 if (tmp != header_list)
1429                         continue;
1430
1431                 do {
1432                         root = list_entry(root->root_list.next,
1433                                         struct ctl_table_root, root_list);
1434                         if (root == &sysctl_table_root)
1435                                 goto out;
1436                         header_list = lookup_header_list(root, namespaces);
1437                 } while (list_empty(header_list));
1438                 tmp = header_list->next;
1439         }
1440 out:
1441         spin_unlock(&sysctl_lock);
1442         return NULL;
1443 }
1444
1445 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1446 {
1447         return __sysctl_head_next(current->nsproxy, prev);
1448 }
1449
1450 void register_sysctl_root(struct ctl_table_root *root)
1451 {
1452         spin_lock(&sysctl_lock);
1453         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1454         spin_unlock(&sysctl_lock);
1455 }
1456
1457 #ifdef CONFIG_SYSCTL_SYSCALL
1458 /* Perform the actual read/write of a sysctl table entry. */
1459 static int do_sysctl_strategy(struct ctl_table_root *root,
1460                         struct ctl_table *table,
1461                         int __user *name, int nlen,
1462                         void __user *oldval, size_t __user *oldlenp,
1463                         void __user *newval, size_t newlen)
1464 {
1465         int op = 0, rc;
1466
1467         if (oldval)
1468                 op |= 004;
1469         if (newval)
1470                 op |= 002;
1471         if (sysctl_perm(root, table, op))
1472                 return -EPERM;
1473
1474         if (table->strategy) {
1475                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1476                                      newval, newlen);
1477                 if (rc < 0)
1478                         return rc;
1479                 if (rc > 0)
1480                         return 0;
1481         }
1482
1483         /* If there is no strategy routine, or if the strategy returns
1484          * zero, proceed with automatic r/w */
1485         if (table->data && table->maxlen) {
1486                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1487                                  newval, newlen);
1488                 if (rc < 0)
1489                         return rc;
1490         }
1491         return 0;
1492 }
1493
1494 static int parse_table(int __user *name, int nlen,
1495                        void __user *oldval, size_t __user *oldlenp,
1496                        void __user *newval, size_t newlen,
1497                        struct ctl_table_root *root,
1498                        struct ctl_table *table)
1499 {
1500         int n;
1501 repeat:
1502         if (!nlen)
1503                 return -ENOTDIR;
1504         if (get_user(n, name))
1505                 return -EFAULT;
1506         for ( ; table->ctl_name || table->procname; table++) {
1507                 if (!table->ctl_name)
1508                         continue;
1509                 if (n == table->ctl_name) {
1510                         int error;
1511                         if (table->child) {
1512                                 if (sysctl_perm(root, table, 001))
1513                                         return -EPERM;
1514                                 name++;
1515                                 nlen--;
1516                                 table = table->child;
1517                                 goto repeat;
1518                         }
1519                         error = do_sysctl_strategy(root, table, name, nlen,
1520                                                    oldval, oldlenp,
1521                                                    newval, newlen);
1522                         return error;
1523                 }
1524         }
1525         return -ENOTDIR;
1526 }
1527
1528 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1529                void __user *newval, size_t newlen)
1530 {
1531         struct ctl_table_header *head;
1532         int error = -ENOTDIR;
1533
1534         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1535                 return -ENOTDIR;
1536         if (oldval) {
1537                 int old_len;
1538                 if (!oldlenp || get_user(old_len, oldlenp))
1539                         return -EFAULT;
1540         }
1541
1542         for (head = sysctl_head_next(NULL); head;
1543                         head = sysctl_head_next(head)) {
1544                 error = parse_table(name, nlen, oldval, oldlenp,
1545                                         newval, newlen,
1546                                         head->root, head->ctl_table);
1547                 if (error != -ENOTDIR) {
1548                         sysctl_head_finish(head);
1549                         break;
1550                 }
1551         }
1552         return error;
1553 }
1554
1555 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1556 {
1557         struct __sysctl_args tmp;
1558         int error;
1559
1560         if (copy_from_user(&tmp, args, sizeof(tmp)))
1561                 return -EFAULT;
1562
1563         error = deprecated_sysctl_warning(&tmp);
1564         if (error)
1565                 goto out;
1566
1567         lock_kernel();
1568         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1569                           tmp.newval, tmp.newlen);
1570         unlock_kernel();
1571 out:
1572         return error;
1573 }
1574 #endif /* CONFIG_SYSCTL_SYSCALL */
1575
1576 /*
1577  * sysctl_perm does NOT grant the superuser all rights automatically, because
1578  * some sysctl variables are readonly even to root.
1579  */
1580
1581 static int test_perm(int mode, int op)
1582 {
1583         if (!current->euid)
1584                 mode >>= 6;
1585         else if (in_egroup_p(0))
1586                 mode >>= 3;
1587         if ((mode & op & 0007) == op)
1588                 return 0;
1589         return -EACCES;
1590 }
1591
1592 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1593 {
1594         int error;
1595         int mode;
1596
1597         error = security_sysctl(table, op);
1598         if (error)
1599                 return error;
1600
1601         if (root->permissions)
1602                 mode = root->permissions(root, current->nsproxy, table);
1603         else
1604                 mode = table->mode;
1605
1606         return test_perm(mode, op);
1607 }
1608
1609 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1610 {
1611         for (; table->ctl_name || table->procname; table++) {
1612                 table->parent = parent;
1613                 if (table->child)
1614                         sysctl_set_parent(table, table->child);
1615         }
1616 }
1617
1618 static __init int sysctl_init(void)
1619 {
1620         sysctl_set_parent(NULL, root_table);
1621 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1622         {
1623                 int err;
1624                 err = sysctl_check_table(current->nsproxy, root_table);
1625         }
1626 #endif
1627         return 0;
1628 }
1629
1630 core_initcall(sysctl_init);
1631
1632 /**
1633  * __register_sysctl_paths - register a sysctl hierarchy
1634  * @root: List of sysctl headers to register on
1635  * @namespaces: Data to compute which lists of sysctl entries are visible
1636  * @path: The path to the directory the sysctl table is in.
1637  * @table: the top-level table structure
1638  *
1639  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1640  * array. A completely 0 filled entry terminates the table.
1641  *
1642  * The members of the &struct ctl_table structure are used as follows:
1643  *
1644  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1645  *            must be unique within that level of sysctl
1646  *
1647  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1648  *            enter a sysctl file
1649  *
1650  * data - a pointer to data for use by proc_handler
1651  *
1652  * maxlen - the maximum size in bytes of the data
1653  *
1654  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1655  *
1656  * child - a pointer to the child sysctl table if this entry is a directory, or
1657  *         %NULL.
1658  *
1659  * proc_handler - the text handler routine (described below)
1660  *
1661  * strategy - the strategy routine (described below)
1662  *
1663  * de - for internal use by the sysctl routines
1664  *
1665  * extra1, extra2 - extra pointers usable by the proc handler routines
1666  *
1667  * Leaf nodes in the sysctl tree will be represented by a single file
1668  * under /proc; non-leaf nodes will be represented by directories.
1669  *
1670  * sysctl(2) can automatically manage read and write requests through
1671  * the sysctl table.  The data and maxlen fields of the ctl_table
1672  * struct enable minimal validation of the values being written to be
1673  * performed, and the mode field allows minimal authentication.
1674  *
1675  * More sophisticated management can be enabled by the provision of a
1676  * strategy routine with the table entry.  This will be called before
1677  * any automatic read or write of the data is performed.
1678  *
1679  * The strategy routine may return
1680  *
1681  * < 0 - Error occurred (error is passed to user process)
1682  *
1683  * 0   - OK - proceed with automatic read or write.
1684  *
1685  * > 0 - OK - read or write has been done by the strategy routine, so
1686  *       return immediately.
1687  *
1688  * There must be a proc_handler routine for any terminal nodes
1689  * mirrored under /proc/sys (non-terminals are handled by a built-in
1690  * directory handler).  Several default handlers are available to
1691  * cover common cases -
1692  *
1693  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1694  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1695  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1696  *
1697  * It is the handler's job to read the input buffer from user memory
1698  * and process it. The handler should return 0 on success.
1699  *
1700  * This routine returns %NULL on a failure to register, and a pointer
1701  * to the table header on success.
1702  */
1703 struct ctl_table_header *__register_sysctl_paths(
1704         struct ctl_table_root *root,
1705         struct nsproxy *namespaces,
1706         const struct ctl_path *path, struct ctl_table *table)
1707 {
1708         struct list_head *header_list;
1709         struct ctl_table_header *header;
1710         struct ctl_table *new, **prevp;
1711         unsigned int n, npath;
1712
1713         /* Count the path components */
1714         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1715                 ;
1716
1717         /*
1718          * For each path component, allocate a 2-element ctl_table array.
1719          * The first array element will be filled with the sysctl entry
1720          * for this, the second will be the sentinel (ctl_name == 0).
1721          *
1722          * We allocate everything in one go so that we don't have to
1723          * worry about freeing additional memory in unregister_sysctl_table.
1724          */
1725         header = kzalloc(sizeof(struct ctl_table_header) +
1726                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1727         if (!header)
1728                 return NULL;
1729
1730         new = (struct ctl_table *) (header + 1);
1731
1732         /* Now connect the dots */
1733         prevp = &header->ctl_table;
1734         for (n = 0; n < npath; ++n, ++path) {
1735                 /* Copy the procname */
1736                 new->procname = path->procname;
1737                 new->ctl_name = path->ctl_name;
1738                 new->mode     = 0555;
1739
1740                 *prevp = new;
1741                 prevp = &new->child;
1742
1743                 new += 2;
1744         }
1745         *prevp = table;
1746         header->ctl_table_arg = table;
1747
1748         INIT_LIST_HEAD(&header->ctl_entry);
1749         header->used = 0;
1750         header->unregistering = NULL;
1751         header->root = root;
1752         sysctl_set_parent(NULL, header->ctl_table);
1753 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1754         if (sysctl_check_table(namespaces, header->ctl_table)) {
1755                 kfree(header);
1756                 return NULL;
1757         }
1758 #endif
1759         spin_lock(&sysctl_lock);
1760         header_list = lookup_header_list(root, namespaces);
1761         list_add_tail(&header->ctl_entry, header_list);
1762         spin_unlock(&sysctl_lock);
1763
1764         return header;
1765 }
1766
1767 /**
1768  * register_sysctl_table_path - register a sysctl table hierarchy
1769  * @path: The path to the directory the sysctl table is in.
1770  * @table: the top-level table structure
1771  *
1772  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1773  * array. A completely 0 filled entry terminates the table.
1774  *
1775  * See __register_sysctl_paths for more details.
1776  */
1777 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1778                                                 struct ctl_table *table)
1779 {
1780         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1781                                         path, table);
1782 }
1783
1784 /**
1785  * register_sysctl_table - register a sysctl table hierarchy
1786  * @table: the top-level table structure
1787  *
1788  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1789  * array. A completely 0 filled entry terminates the table.
1790  *
1791  * See register_sysctl_paths for more details.
1792  */
1793 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1794 {
1795         static const struct ctl_path null_path[] = { {} };
1796
1797         return register_sysctl_paths(null_path, table);
1798 }
1799
1800 /**
1801  * unregister_sysctl_table - unregister a sysctl table hierarchy
1802  * @header: the header returned from register_sysctl_table
1803  *
1804  * Unregisters the sysctl table and all children. proc entries may not
1805  * actually be removed until they are no longer used by anyone.
1806  */
1807 void unregister_sysctl_table(struct ctl_table_header * header)
1808 {
1809         might_sleep();
1810
1811         if (header == NULL)
1812                 return;
1813
1814         spin_lock(&sysctl_lock);
1815         start_unregistering(header);
1816         spin_unlock(&sysctl_lock);
1817         kfree(header);
1818 }
1819
1820 #else /* !CONFIG_SYSCTL */
1821 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1822 {
1823         return NULL;
1824 }
1825
1826 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1827                                                     struct ctl_table *table)
1828 {
1829         return NULL;
1830 }
1831
1832 void unregister_sysctl_table(struct ctl_table_header * table)
1833 {
1834 }
1835
1836 #endif /* CONFIG_SYSCTL */
1837
1838 /*
1839  * /proc/sys support
1840  */
1841
1842 #ifdef CONFIG_PROC_SYSCTL
1843
1844 static int _proc_do_string(void* data, int maxlen, int write,
1845                            struct file *filp, void __user *buffer,
1846                            size_t *lenp, loff_t *ppos)
1847 {
1848         size_t len;
1849         char __user *p;
1850         char c;
1851
1852         if (!data || !maxlen || !*lenp) {
1853                 *lenp = 0;
1854                 return 0;
1855         }
1856
1857         if (write) {
1858                 len = 0;
1859                 p = buffer;
1860                 while (len < *lenp) {
1861                         if (get_user(c, p++))
1862                                 return -EFAULT;
1863                         if (c == 0 || c == '\n')
1864                                 break;
1865                         len++;
1866                 }
1867                 if (len >= maxlen)
1868                         len = maxlen-1;
1869                 if(copy_from_user(data, buffer, len))
1870                         return -EFAULT;
1871                 ((char *) data)[len] = 0;
1872                 *ppos += *lenp;
1873         } else {
1874                 len = strlen(data);
1875                 if (len > maxlen)
1876                         len = maxlen;
1877
1878                 if (*ppos > len) {
1879                         *lenp = 0;
1880                         return 0;
1881                 }
1882
1883                 data += *ppos;
1884                 len  -= *ppos;
1885
1886                 if (len > *lenp)
1887                         len = *lenp;
1888                 if (len)
1889                         if(copy_to_user(buffer, data, len))
1890                                 return -EFAULT;
1891                 if (len < *lenp) {
1892                         if(put_user('\n', ((char __user *) buffer) + len))
1893                                 return -EFAULT;
1894                         len++;
1895                 }
1896                 *lenp = len;
1897                 *ppos += len;
1898         }
1899         return 0;
1900 }
1901
1902 /**
1903  * proc_dostring - read a string sysctl
1904  * @table: the sysctl table
1905  * @write: %TRUE if this is a write to the sysctl file
1906  * @filp: the file structure
1907  * @buffer: the user buffer
1908  * @lenp: the size of the user buffer
1909  * @ppos: file position
1910  *
1911  * Reads/writes a string from/to the user buffer. If the kernel
1912  * buffer provided is not large enough to hold the string, the
1913  * string is truncated. The copied string is %NULL-terminated.
1914  * If the string is being read by the user process, it is copied
1915  * and a newline '\n' is added. It is truncated if the buffer is
1916  * not large enough.
1917  *
1918  * Returns 0 on success.
1919  */
1920 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1921                   void __user *buffer, size_t *lenp, loff_t *ppos)
1922 {
1923         return _proc_do_string(table->data, table->maxlen, write, filp,
1924                                buffer, lenp, ppos);
1925 }
1926
1927
1928 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1929                                  int *valp,
1930                                  int write, void *data)
1931 {
1932         if (write) {
1933                 *valp = *negp ? -*lvalp : *lvalp;
1934         } else {
1935                 int val = *valp;
1936                 if (val < 0) {
1937                         *negp = -1;
1938                         *lvalp = (unsigned long)-val;
1939                 } else {
1940                         *negp = 0;
1941                         *lvalp = (unsigned long)val;
1942                 }
1943         }
1944         return 0;
1945 }
1946
1947 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1948                   int write, struct file *filp, void __user *buffer,
1949                   size_t *lenp, loff_t *ppos,
1950                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1951                               int write, void *data),
1952                   void *data)
1953 {
1954 #define TMPBUFLEN 21
1955         int *i, vleft, first=1, neg, val;
1956         unsigned long lval;
1957         size_t left, len;
1958
1959         char buf[TMPBUFLEN], *p;
1960         char __user *s = buffer;
1961
1962         if (!tbl_data || !table->maxlen || !*lenp ||
1963             (*ppos && !write)) {
1964                 *lenp = 0;
1965                 return 0;
1966         }
1967
1968         i = (int *) tbl_data;
1969         vleft = table->maxlen / sizeof(*i);
1970         left = *lenp;
1971
1972         if (!conv)
1973                 conv = do_proc_dointvec_conv;
1974
1975         for (; left && vleft--; i++, first=0) {
1976                 if (write) {
1977                         while (left) {
1978                                 char c;
1979                                 if (get_user(c, s))
1980                                         return -EFAULT;
1981                                 if (!isspace(c))
1982                                         break;
1983                                 left--;
1984                                 s++;
1985                         }
1986                         if (!left)
1987                                 break;
1988                         neg = 0;
1989                         len = left;
1990                         if (len > sizeof(buf) - 1)
1991                                 len = sizeof(buf) - 1;
1992                         if (copy_from_user(buf, s, len))
1993                                 return -EFAULT;
1994                         buf[len] = 0;
1995                         p = buf;
1996                         if (*p == '-' && left > 1) {
1997                                 neg = 1;
1998                                 p++;
1999                         }
2000                         if (*p < '0' || *p > '9')
2001                                 break;
2002
2003                         lval = simple_strtoul(p, &p, 0);
2004
2005                         len = p-buf;
2006                         if ((len < left) && *p && !isspace(*p))
2007                                 break;
2008                         if (neg)
2009                                 val = -val;
2010                         s += len;
2011                         left -= len;
2012
2013                         if (conv(&neg, &lval, i, 1, data))
2014                                 break;
2015                 } else {
2016                         p = buf;
2017                         if (!first)
2018                                 *p++ = '\t';
2019
2020                         if (conv(&neg, &lval, i, 0, data))
2021                                 break;
2022
2023                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2024                         len = strlen(buf);
2025                         if (len > left)
2026                                 len = left;
2027                         if(copy_to_user(s, buf, len))
2028                                 return -EFAULT;
2029                         left -= len;
2030                         s += len;
2031                 }
2032         }
2033
2034         if (!write && !first && left) {
2035                 if(put_user('\n', s))
2036                         return -EFAULT;
2037                 left--, s++;
2038         }
2039         if (write) {
2040                 while (left) {
2041                         char c;
2042                         if (get_user(c, s++))
2043                                 return -EFAULT;
2044                         if (!isspace(c))
2045                                 break;
2046                         left--;
2047                 }
2048         }
2049         if (write && first)
2050                 return -EINVAL;
2051         *lenp -= left;
2052         *ppos += *lenp;
2053         return 0;
2054 #undef TMPBUFLEN
2055 }
2056
2057 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2058                   void __user *buffer, size_t *lenp, loff_t *ppos,
2059                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2060                               int write, void *data),
2061                   void *data)
2062 {
2063         return __do_proc_dointvec(table->data, table, write, filp,
2064                         buffer, lenp, ppos, conv, data);
2065 }
2066
2067 /**
2068  * proc_dointvec - read a vector of integers
2069  * @table: the sysctl table
2070  * @write: %TRUE if this is a write to the sysctl file
2071  * @filp: the file structure
2072  * @buffer: the user buffer
2073  * @lenp: the size of the user buffer
2074  * @ppos: file position
2075  *
2076  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2077  * values from/to the user buffer, treated as an ASCII string.
2078  *
2079  * Returns 0 on success.
2080  */
2081 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2082                      void __user *buffer, size_t *lenp, loff_t *ppos)
2083 {
2084     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2085                             NULL,NULL);
2086 }
2087
2088 #define OP_SET  0
2089 #define OP_AND  1
2090 #define OP_OR   2
2091
2092 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2093                                       int *valp,
2094                                       int write, void *data)
2095 {
2096         int op = *(int *)data;
2097         if (write) {
2098                 int val = *negp ? -*lvalp : *lvalp;
2099                 switch(op) {
2100                 case OP_SET:    *valp = val; break;
2101                 case OP_AND:    *valp &= val; break;
2102                 case OP_OR:     *valp |= val; break;
2103                 }
2104         } else {
2105                 int val = *valp;
2106                 if (val < 0) {
2107                         *negp = -1;
2108                         *lvalp = (unsigned long)-val;
2109                 } else {
2110                         *negp = 0;
2111                         *lvalp = (unsigned long)val;
2112                 }
2113         }
2114         return 0;
2115 }
2116
2117 /*
2118  *      Taint values can only be increased
2119  */
2120 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2121                                void __user *buffer, size_t *lenp, loff_t *ppos)
2122 {
2123         int op;
2124
2125         if (write && !capable(CAP_SYS_ADMIN))
2126                 return -EPERM;
2127
2128         op = OP_OR;
2129         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2130                                 do_proc_dointvec_bset_conv,&op);
2131 }
2132
2133 struct do_proc_dointvec_minmax_conv_param {
2134         int *min;
2135         int *max;
2136 };
2137
2138 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2139                                         int *valp,
2140                                         int write, void *data)
2141 {
2142         struct do_proc_dointvec_minmax_conv_param *param = data;
2143         if (write) {
2144                 int val = *negp ? -*lvalp : *lvalp;
2145                 if ((param->min && *param->min > val) ||
2146                     (param->max && *param->max < val))
2147                         return -EINVAL;
2148                 *valp = val;
2149         } else {
2150                 int val = *valp;
2151                 if (val < 0) {
2152                         *negp = -1;
2153                         *lvalp = (unsigned long)-val;
2154                 } else {
2155                         *negp = 0;
2156                         *lvalp = (unsigned long)val;
2157                 }
2158         }
2159         return 0;
2160 }
2161
2162 /**
2163  * proc_dointvec_minmax - read a vector of integers with min/max values
2164  * @table: the sysctl table
2165  * @write: %TRUE if this is a write to the sysctl file
2166  * @filp: the file structure
2167  * @buffer: the user buffer
2168  * @lenp: the size of the user buffer
2169  * @ppos: file position
2170  *
2171  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2172  * values from/to the user buffer, treated as an ASCII string.
2173  *
2174  * This routine will ensure the values are within the range specified by
2175  * table->extra1 (min) and table->extra2 (max).
2176  *
2177  * Returns 0 on success.
2178  */
2179 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2180                   void __user *buffer, size_t *lenp, loff_t *ppos)
2181 {
2182         struct do_proc_dointvec_minmax_conv_param param = {
2183                 .min = (int *) table->extra1,
2184                 .max = (int *) table->extra2,
2185         };
2186         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2187                                 do_proc_dointvec_minmax_conv, &param);
2188 }
2189
2190 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2191                                      struct file *filp,
2192                                      void __user *buffer,
2193                                      size_t *lenp, loff_t *ppos,
2194                                      unsigned long convmul,
2195                                      unsigned long convdiv)
2196 {
2197 #define TMPBUFLEN 21
2198         unsigned long *i, *min, *max, val;
2199         int vleft, first=1, neg;
2200         size_t len, left;
2201         char buf[TMPBUFLEN], *p;
2202         char __user *s = buffer;
2203
2204         if (!data || !table->maxlen || !*lenp ||
2205             (*ppos && !write)) {
2206                 *lenp = 0;
2207                 return 0;
2208         }
2209
2210         i = (unsigned long *) data;
2211         min = (unsigned long *) table->extra1;
2212         max = (unsigned long *) table->extra2;
2213         vleft = table->maxlen / sizeof(unsigned long);
2214         left = *lenp;
2215
2216         for (; left && vleft--; i++, min++, max++, first=0) {
2217                 if (write) {
2218                         while (left) {
2219                                 char c;
2220                                 if (get_user(c, s))
2221                                         return -EFAULT;
2222                                 if (!isspace(c))
2223                                         break;
2224                                 left--;
2225                                 s++;
2226                         }
2227                         if (!left)
2228                                 break;
2229                         neg = 0;
2230                         len = left;
2231                         if (len > TMPBUFLEN-1)
2232                                 len = TMPBUFLEN-1;
2233                         if (copy_from_user(buf, s, len))
2234                                 return -EFAULT;
2235                         buf[len] = 0;
2236                         p = buf;
2237                         if (*p == '-' && left > 1) {
2238                                 neg = 1;
2239                                 p++;
2240                         }
2241                         if (*p < '0' || *p > '9')
2242                                 break;
2243                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2244                         len = p-buf;
2245                         if ((len < left) && *p && !isspace(*p))
2246                                 break;
2247                         if (neg)
2248                                 val = -val;
2249                         s += len;
2250                         left -= len;
2251
2252                         if(neg)
2253                                 continue;
2254                         if ((min && val < *min) || (max && val > *max))
2255                                 continue;
2256                         *i = val;
2257                 } else {
2258                         p = buf;
2259                         if (!first)
2260                                 *p++ = '\t';
2261                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2262                         len = strlen(buf);
2263                         if (len > left)
2264                                 len = left;
2265                         if(copy_to_user(s, buf, len))
2266                                 return -EFAULT;
2267                         left -= len;
2268                         s += len;
2269                 }
2270         }
2271
2272         if (!write && !first && left) {
2273                 if(put_user('\n', s))
2274                         return -EFAULT;
2275                 left--, s++;
2276         }
2277         if (write) {
2278                 while (left) {
2279                         char c;
2280                         if (get_user(c, s++))
2281                                 return -EFAULT;
2282                         if (!isspace(c))
2283                                 break;
2284                         left--;
2285                 }
2286         }
2287         if (write && first)
2288                 return -EINVAL;
2289         *lenp -= left;
2290         *ppos += *lenp;
2291         return 0;
2292 #undef TMPBUFLEN
2293 }
2294
2295 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2296                                      struct file *filp,
2297                                      void __user *buffer,
2298                                      size_t *lenp, loff_t *ppos,
2299                                      unsigned long convmul,
2300                                      unsigned long convdiv)
2301 {
2302         return __do_proc_doulongvec_minmax(table->data, table, write,
2303                         filp, buffer, lenp, ppos, convmul, convdiv);
2304 }
2305
2306 /**
2307  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2308  * @table: the sysctl table
2309  * @write: %TRUE if this is a write to the sysctl file
2310  * @filp: the file structure
2311  * @buffer: the user buffer
2312  * @lenp: the size of the user buffer
2313  * @ppos: file position
2314  *
2315  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2316  * values from/to the user buffer, treated as an ASCII string.
2317  *
2318  * This routine will ensure the values are within the range specified by
2319  * table->extra1 (min) and table->extra2 (max).
2320  *
2321  * Returns 0 on success.
2322  */
2323 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2324                            void __user *buffer, size_t *lenp, loff_t *ppos)
2325 {
2326     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2327 }
2328
2329 /**
2330  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2331  * @table: the sysctl table
2332  * @write: %TRUE if this is a write to the sysctl file
2333  * @filp: the file structure
2334  * @buffer: the user buffer
2335  * @lenp: the size of the user buffer
2336  * @ppos: file position
2337  *
2338  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2339  * values from/to the user buffer, treated as an ASCII string. The values
2340  * are treated as milliseconds, and converted to jiffies when they are stored.
2341  *
2342  * This routine will ensure the values are within the range specified by
2343  * table->extra1 (min) and table->extra2 (max).
2344  *
2345  * Returns 0 on success.
2346  */
2347 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2348                                       struct file *filp,
2349                                       void __user *buffer,
2350                                       size_t *lenp, loff_t *ppos)
2351 {
2352     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2353                                      lenp, ppos, HZ, 1000l);
2354 }
2355
2356
2357 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2358                                          int *valp,
2359                                          int write, void *data)
2360 {
2361         if (write) {
2362                 if (*lvalp > LONG_MAX / HZ)
2363                         return 1;
2364                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2365         } else {
2366                 int val = *valp;
2367                 unsigned long lval;
2368                 if (val < 0) {
2369                         *negp = -1;
2370                         lval = (unsigned long)-val;
2371                 } else {
2372                         *negp = 0;
2373                         lval = (unsigned long)val;
2374                 }
2375                 *lvalp = lval / HZ;
2376         }
2377         return 0;
2378 }
2379
2380 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2381                                                 int *valp,
2382                                                 int write, void *data)
2383 {
2384         if (write) {
2385                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2386                         return 1;
2387                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2388         } else {
2389                 int val = *valp;
2390                 unsigned long lval;
2391                 if (val < 0) {
2392                         *negp = -1;
2393                         lval = (unsigned long)-val;
2394                 } else {
2395                         *negp = 0;
2396                         lval = (unsigned long)val;
2397                 }
2398                 *lvalp = jiffies_to_clock_t(lval);
2399         }
2400         return 0;
2401 }
2402
2403 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2404                                             int *valp,
2405                                             int write, void *data)
2406 {
2407         if (write) {
2408                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2409         } else {
2410                 int val = *valp;
2411                 unsigned long lval;
2412                 if (val < 0) {
2413                         *negp = -1;
2414                         lval = (unsigned long)-val;
2415                 } else {
2416                         *negp = 0;
2417                         lval = (unsigned long)val;
2418                 }
2419                 *lvalp = jiffies_to_msecs(lval);
2420         }
2421         return 0;
2422 }
2423
2424 /**
2425  * proc_dointvec_jiffies - read a vector of integers as seconds
2426  * @table: the sysctl table
2427  * @write: %TRUE if this is a write to the sysctl file
2428  * @filp: the file structure
2429  * @buffer: the user buffer
2430  * @lenp: the size of the user buffer
2431  * @ppos: file position
2432  *
2433  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2434  * values from/to the user buffer, treated as an ASCII string.
2435  * The values read are assumed to be in seconds, and are converted into
2436  * jiffies.
2437  *
2438  * Returns 0 on success.
2439  */
2440 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2441                           void __user *buffer, size_t *lenp, loff_t *ppos)
2442 {
2443     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2444                             do_proc_dointvec_jiffies_conv,NULL);
2445 }
2446
2447 /**
2448  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2449  * @table: the sysctl table
2450  * @write: %TRUE if this is a write to the sysctl file
2451  * @filp: the file structure
2452  * @buffer: the user buffer
2453  * @lenp: the size of the user buffer
2454  * @ppos: pointer to the file position
2455  *
2456  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2457  * values from/to the user buffer, treated as an ASCII string.
2458  * The values read are assumed to be in 1/USER_HZ seconds, and
2459  * are converted into jiffies.
2460  *
2461  * Returns 0 on success.
2462  */
2463 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2464                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2465 {
2466     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2467                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2468 }
2469
2470 /**
2471  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2472  * @table: the sysctl table
2473  * @write: %TRUE if this is a write to the sysctl file
2474  * @filp: the file structure
2475  * @buffer: the user buffer
2476  * @lenp: the size of the user buffer
2477  * @ppos: file position
2478  * @ppos: the current position in the file
2479  *
2480  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2481  * values from/to the user buffer, treated as an ASCII string.
2482  * The values read are assumed to be in 1/1000 seconds, and
2483  * are converted into jiffies.
2484  *
2485  * Returns 0 on success.
2486  */
2487 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2488                              void __user *buffer, size_t *lenp, loff_t *ppos)
2489 {
2490         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2491                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2492 }
2493
2494 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2495                            void __user *buffer, size_t *lenp, loff_t *ppos)
2496 {
2497         struct pid *new_pid;
2498         pid_t tmp;
2499         int r;
2500
2501         tmp = pid_vnr(cad_pid);
2502
2503         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2504                                lenp, ppos, NULL, NULL);
2505         if (r || !write)
2506                 return r;
2507
2508         new_pid = find_get_pid(tmp);
2509         if (!new_pid)
2510                 return -ESRCH;
2511
2512         put_pid(xchg(&cad_pid, new_pid));
2513         return 0;
2514 }
2515
2516 #else /* CONFIG_PROC_FS */
2517
2518 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2519                   void __user *buffer, size_t *lenp, loff_t *ppos)
2520 {
2521         return -ENOSYS;
2522 }
2523
2524 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2525                   void __user *buffer, size_t *lenp, loff_t *ppos)
2526 {
2527         return -ENOSYS;
2528 }
2529
2530 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2531                     void __user *buffer, size_t *lenp, loff_t *ppos)
2532 {
2533         return -ENOSYS;
2534 }
2535
2536 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2537                     void __user *buffer, size_t *lenp, loff_t *ppos)
2538 {
2539         return -ENOSYS;
2540 }
2541
2542 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2543                     void __user *buffer, size_t *lenp, loff_t *ppos)
2544 {
2545         return -ENOSYS;
2546 }
2547
2548 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2549                              void __user *buffer, size_t *lenp, loff_t *ppos)
2550 {
2551         return -ENOSYS;
2552 }
2553
2554 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2555                     void __user *buffer, size_t *lenp, loff_t *ppos)
2556 {
2557         return -ENOSYS;
2558 }
2559
2560 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2561                                       struct file *filp,
2562                                       void __user *buffer,
2563                                       size_t *lenp, loff_t *ppos)
2564 {
2565     return -ENOSYS;
2566 }
2567
2568
2569 #endif /* CONFIG_PROC_FS */
2570
2571
2572 #ifdef CONFIG_SYSCTL_SYSCALL
2573 /*
2574  * General sysctl support routines
2575  */
2576
2577 /* The generic sysctl data routine (used if no strategy routine supplied) */
2578 int sysctl_data(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         size_t len;
2583
2584         /* Get out of I don't have a variable */
2585         if (!table->data || !table->maxlen)
2586                 return -ENOTDIR;
2587
2588         if (oldval && oldlenp) {
2589                 if (get_user(len, oldlenp))
2590                         return -EFAULT;
2591                 if (len) {
2592                         if (len > table->maxlen)
2593                                 len = table->maxlen;
2594                         if (copy_to_user(oldval, table->data, len))
2595                                 return -EFAULT;
2596                         if (put_user(len, oldlenp))
2597                                 return -EFAULT;
2598                 }
2599         }
2600
2601         if (newval && newlen) {
2602                 if (newlen > table->maxlen)
2603                         newlen = table->maxlen;
2604
2605                 if (copy_from_user(table->data, newval, newlen))
2606                         return -EFAULT;
2607         }
2608         return 1;
2609 }
2610
2611 /* The generic string strategy routine: */
2612 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2613                   void __user *oldval, size_t __user *oldlenp,
2614                   void __user *newval, size_t newlen)
2615 {
2616         if (!table->data || !table->maxlen)
2617                 return -ENOTDIR;
2618
2619         if (oldval && oldlenp) {
2620                 size_t bufsize;
2621                 if (get_user(bufsize, oldlenp))
2622                         return -EFAULT;
2623                 if (bufsize) {
2624                         size_t len = strlen(table->data), copied;
2625
2626                         /* This shouldn't trigger for a well-formed sysctl */
2627                         if (len > table->maxlen)
2628                                 len = table->maxlen;
2629
2630                         /* Copy up to a max of bufsize-1 bytes of the string */
2631                         copied = (len >= bufsize) ? bufsize - 1 : len;
2632
2633                         if (copy_to_user(oldval, table->data, copied) ||
2634                             put_user(0, (char __user *)(oldval + copied)))
2635                                 return -EFAULT;
2636                         if (put_user(len, oldlenp))
2637                                 return -EFAULT;
2638                 }
2639         }
2640         if (newval && newlen) {
2641                 size_t len = newlen;
2642                 if (len > table->maxlen)
2643                         len = table->maxlen;
2644                 if(copy_from_user(table->data, newval, len))
2645                         return -EFAULT;
2646                 if (len == table->maxlen)
2647                         len--;
2648                 ((char *) table->data)[len] = 0;
2649         }
2650         return 1;
2651 }
2652
2653 /*
2654  * This function makes sure that all of the integers in the vector
2655  * are between the minimum and maximum values given in the arrays
2656  * table->extra1 and table->extra2, respectively.
2657  */
2658 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2659                 void __user *oldval, size_t __user *oldlenp,
2660                 void __user *newval, size_t newlen)
2661 {
2662
2663         if (newval && newlen) {
2664                 int __user *vec = (int __user *) newval;
2665                 int *min = (int *) table->extra1;
2666                 int *max = (int *) table->extra2;
2667                 size_t length;
2668                 int i;
2669
2670                 if (newlen % sizeof(int) != 0)
2671                         return -EINVAL;
2672
2673                 if (!table->extra1 && !table->extra2)
2674                         return 0;
2675
2676                 if (newlen > table->maxlen)
2677                         newlen = table->maxlen;
2678                 length = newlen / sizeof(int);
2679
2680                 for (i = 0; i < length; i++) {
2681                         int value;
2682                         if (get_user(value, vec + i))
2683                                 return -EFAULT;
2684                         if (min && value < min[i])
2685                                 return -EINVAL;
2686                         if (max && value > max[i])
2687                                 return -EINVAL;
2688                 }
2689         }
2690         return 0;
2691 }
2692
2693 /* Strategy function to convert jiffies to seconds */
2694 int sysctl_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 = *(int *)(table->data) / HZ;
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) = new*HZ;
2723         }
2724         return 1;
2725 }
2726
2727 /* Strategy function to convert jiffies to seconds */
2728 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2729                 void __user *oldval, size_t __user *oldlenp,
2730                 void __user *newval, size_t newlen)
2731 {
2732         if (oldval && oldlenp) {
2733                 size_t olen;
2734
2735                 if (get_user(olen, oldlenp))
2736                         return -EFAULT;
2737                 if (olen) {
2738                         int val;
2739
2740                         if (olen < sizeof(int))
2741                                 return -EINVAL;
2742
2743                         val = jiffies_to_msecs(*(int *)(table->data));
2744                         if (put_user(val, (int __user *)oldval))
2745                                 return -EFAULT;
2746                         if (put_user(sizeof(int), oldlenp))
2747                                 return -EFAULT;
2748                 }
2749         }
2750         if (newval && newlen) {
2751                 int new;
2752                 if (newlen != sizeof(int))
2753                         return -EINVAL;
2754                 if (get_user(new, (int __user *)newval))
2755                         return -EFAULT;
2756                 *(int *)(table->data) = msecs_to_jiffies(new);
2757         }
2758         return 1;
2759 }
2760
2761
2762
2763 #else /* CONFIG_SYSCTL_SYSCALL */
2764
2765
2766 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2767 {
2768         struct __sysctl_args tmp;
2769         int error;
2770
2771         if (copy_from_user(&tmp, args, sizeof(tmp)))
2772                 return -EFAULT;
2773
2774         error = deprecated_sysctl_warning(&tmp);
2775
2776         /* If no error reading the parameters then just -ENOSYS ... */
2777         if (!error)
2778                 error = -ENOSYS;
2779
2780         return error;
2781 }
2782
2783 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2784                   void __user *oldval, size_t __user *oldlenp,
2785                   void __user *newval, size_t newlen)
2786 {
2787         return -ENOSYS;
2788 }
2789
2790 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2791                   void __user *oldval, size_t __user *oldlenp,
2792                   void __user *newval, size_t newlen)
2793 {
2794         return -ENOSYS;
2795 }
2796
2797 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2798                 void __user *oldval, size_t __user *oldlenp,
2799                 void __user *newval, size_t newlen)
2800 {
2801         return -ENOSYS;
2802 }
2803
2804 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2805                 void __user *oldval, size_t __user *oldlenp,
2806                 void __user *newval, size_t newlen)
2807 {
2808         return -ENOSYS;
2809 }
2810
2811 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2812                 void __user *oldval, size_t __user *oldlenp,
2813                 void __user *newval, size_t newlen)
2814 {
2815         return -ENOSYS;
2816 }
2817
2818 #endif /* CONFIG_SYSCTL_SYSCALL */
2819
2820 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2821 {
2822         static int msg_count;
2823         int name[CTL_MAXNAME];
2824         int i;
2825
2826         /* Check args->nlen. */
2827         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2828                 return -ENOTDIR;
2829
2830         /* Read in the sysctl name for better debug message logging */
2831         for (i = 0; i < args->nlen; i++)
2832                 if (get_user(name[i], args->name + i))
2833                         return -EFAULT;
2834
2835         /* Ignore accesses to kernel.version */
2836         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2837                 return 0;
2838
2839         if (msg_count < 5) {
2840                 msg_count++;
2841                 printk(KERN_INFO
2842                         "warning: process `%s' used the deprecated sysctl "
2843                         "system call with ", current->comm);
2844                 for (i = 0; i < args->nlen; i++)
2845                         printk("%d.", name[i]);
2846                 printk("\n");
2847         }
2848         return 0;
2849 }
2850
2851 /*
2852  * No sense putting this after each symbol definition, twice,
2853  * exception granted :-)
2854  */
2855 EXPORT_SYMBOL(proc_dointvec);
2856 EXPORT_SYMBOL(proc_dointvec_jiffies);
2857 EXPORT_SYMBOL(proc_dointvec_minmax);
2858 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2859 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2860 EXPORT_SYMBOL(proc_dostring);
2861 EXPORT_SYMBOL(proc_doulongvec_minmax);
2862 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2863 EXPORT_SYMBOL(register_sysctl_table);
2864 EXPORT_SYMBOL(register_sysctl_paths);
2865 EXPORT_SYMBOL(sysctl_intvec);
2866 EXPORT_SYMBOL(sysctl_jiffies);
2867 EXPORT_SYMBOL(sysctl_ms_jiffies);
2868 EXPORT_SYMBOL(sysctl_string);
2869 EXPORT_SYMBOL(sysctl_data);
2870 EXPORT_SYMBOL(unregister_sysctl_table);