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/capability.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/security.h>
  41 #include <linux/initrd.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49
  50 #include <asm/uaccess.h>
  51 #include <asm/processor.h>
  52
  53 #ifdef CONFIG_X86
  54 #include <asm/nmi.h>
  55 #include <asm/stacktrace.h>
  56 #endif
  57
  58 #if defined(CONFIG_SYSCTL)
  59
  60 /* External variables not in a header file. */
  61 extern int C_A_D;
  62 extern int print_fatal_signals;
  63 extern int sysctl_overcommit_memory;
  64 extern int sysctl_overcommit_ratio;
  65 extern int sysctl_panic_on_oom;
  66 extern int sysctl_oom_kill_allocating_task;
  67 extern int max_threads;
  68 extern int core_uses_pid;
  69 extern int suid_dumpable;
  70 extern char core_pattern[];
  71 extern int pid_max;
  72 extern int min_free_kbytes;
  73 extern int printk_ratelimit_jiffies;
  74 extern int printk_ratelimit_burst;
  75 extern int pid_max_min, pid_max_max;
  76 extern int sysctl_drop_caches;
  77 extern int percpu_pagelist_fraction;
  78 extern int compat_log;
  79 extern int maps_protect;
  80 extern int sysctl_stat_interval;
  81 extern int audit_argv_kb;
  82
  83 /* Constants used for minimum and  maximum */
  84 #ifdef CONFIG_DETECT_SOFTLOCKUP
  85 static int one = 1;
  86 static int sixty = 60;
  87 #endif
  88
  89 #ifdef CONFIG_MMU
  90 static int two = 2;
  91 #endif
  92
  93 static int zero;
  94 static int one_hundred = 100;
  95
  96 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
  97 static int maxolduid = 65535;
  98 static int minolduid;
  99 static int min_percpu_pagelist_fract = 8;
 100
 101 static int ngroups_max = NGROUPS_MAX;
 102
 103 #ifdef CONFIG_KMOD
 104 extern char modprobe_path[];
 105 #endif
 106 #ifdef CONFIG_CHR_DEV_SG
 107 extern int sg_big_buff;
 108 #endif
 109
 110 #ifdef __sparc__
 111 extern char reboot_command [];
 112 extern int stop_a_enabled;
 113 extern int scons_pwroff;
 114 #endif
 115
 116 #ifdef __hppa__
 117 extern int pwrsw_enabled;
 118 extern int unaligned_enabled;
 119 #endif
 120
 121 #ifdef CONFIG_S390
 122 #ifdef CONFIG_MATHEMU
 123 extern int sysctl_ieee_emulation_warnings;
 124 #endif
 125 extern int sysctl_userprocess_debug;
 126 extern int spin_retry;
 127 #endif
 128
 129 extern int sysctl_hz_timer;
 130
 131 #ifdef CONFIG_BSD_PROCESS_ACCT
 132 extern int acct_parm[];
 133 #endif
 134
 135 #ifdef CONFIG_IA64
 136 extern int no_unaligned_warning;
 137 #endif
 138
 139 #ifdef CONFIG_RT_MUTEXES
 140 extern int max_lock_depth;
 141 #endif
 142
 143 #ifdef CONFIG_SYSCTL_SYSCALL
 144 static int parse_table(int __user *, int, void __user *, size_t __user *,
 145                 void __user *, size_t, struct ctl_table *);
 146 #endif
 147
 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_header root_table_header =
 158         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 159
 160 static struct ctl_table kern_table[];
 161 static struct ctl_table vm_table[];
 162 static struct ctl_table fs_table[];
 163 static struct ctl_table debug_table[];
 164 static struct ctl_table dev_table[];
 165 extern struct ctl_table random_table[];
 166 #ifdef CONFIG_INOTIFY_USER
 167 extern struct ctl_table inotify_table[];
 168 #endif
 169
 170 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 171 int sysctl_legacy_va_layout;
 172 #endif
 173
 174 extern int prove_locking;
 175 extern int lock_stat;
 176
 177 /* The default sysctl tables: */
 178
 179 static struct ctl_table root_table[] = {
 180         {
 181                 .ctl_name       = CTL_KERN,
 182                 .procname       = "kernel",
 183                 .mode           = 0555,
 184                 .child          = kern_table,
 185         },
 186         {
 187                 .ctl_name       = CTL_VM,
 188                 .procname       = "vm",
 189                 .mode           = 0555,
 190                 .child          = vm_table,
 191         },
 192 #ifdef CONFIG_NET
 193         {
 194                 .ctl_name       = CTL_NET,
 195                 .procname       = "net",
 196                 .mode           = 0555,
 197                 .child          = net_table,
 198         },
 199 #endif
 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 unsigned long min_sched_granularity_ns = 100000;         /* 100 usecs */
 227 static unsigned long max_sched_granularity_ns = 1000000000;     /* 1 second */
 228 static unsigned long min_wakeup_granularity_ns;                 /* 0 usecs */
 229 static unsigned long max_wakeup_granularity_ns = 1000000000;    /* 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_nr_latency",
 237                 .data           = &sysctl_sched_nr_latency,
 238                 .maxlen         = sizeof(unsigned int),
 239                 .mode           = 0644,
 240                 .proc_handler   = &proc_dointvec,
 241         },
 242         {
 243                 .ctl_name       = CTL_UNNUMBERED,
 244                 .procname       = "sched_latency_ns",
 245                 .data           = &sysctl_sched_latency,
 246                 .maxlen         = sizeof(unsigned int),
 247                 .mode           = 0644,
 248                 .proc_handler   = &proc_dointvec_minmax,
 249                 .strategy       = &sysctl_intvec,
 250                 .extra1         = &min_sched_granularity_ns,
 251                 .extra2         = &max_sched_granularity_ns,
 252         },
 253         {
 254                 .ctl_name       = CTL_UNNUMBERED,
 255                 .procname       = "sched_wakeup_granularity_ns",
 256                 .data           = &sysctl_sched_wakeup_granularity,
 257                 .maxlen         = sizeof(unsigned int),
 258                 .mode           = 0644,
 259                 .proc_handler   = &proc_dointvec_minmax,
 260                 .strategy       = &sysctl_intvec,
 261                 .extra1         = &min_wakeup_granularity_ns,
 262                 .extra2         = &max_wakeup_granularity_ns,
 263         },
 264         {
 265                 .ctl_name       = CTL_UNNUMBERED,
 266                 .procname       = "sched_batch_wakeup_granularity_ns",
 267                 .data           = &sysctl_sched_batch_wakeup_granularity,
 268                 .maxlen         = sizeof(unsigned int),
 269                 .mode           = 0644,
 270                 .proc_handler   = &proc_dointvec_minmax,
 271                 .strategy       = &sysctl_intvec,
 272                 .extra1         = &min_wakeup_granularity_ns,
 273                 .extra2         = &max_wakeup_granularity_ns,
 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 #endif
 300         {
 301                 .ctl_name       = CTL_UNNUMBERED,
 302                 .procname       = "sched_compat_yield",
 303                 .data           = &sysctl_sched_compat_yield,
 304                 .maxlen         = sizeof(unsigned int),
 305                 .mode           = 0644,
 306                 .proc_handler   = &proc_dointvec,
 307         },
 308 #ifdef CONFIG_PROVE_LOCKING
 309         {
 310                 .ctl_name       = CTL_UNNUMBERED,
 311                 .procname       = "prove_locking",
 312                 .data           = &prove_locking,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = &proc_dointvec,
 316         },
 317 #endif
 318 #ifdef CONFIG_LOCK_STAT
 319         {
 320                 .ctl_name       = CTL_UNNUMBERED,
 321                 .procname       = "lock_stat",
 322                 .data           = &lock_stat,
 323                 .maxlen         = sizeof(int),
 324                 .mode           = 0644,
 325                 .proc_handler   = &proc_dointvec,
 326         },
 327 #endif
 328         {
 329                 .ctl_name       = KERN_PANIC,
 330                 .procname       = "panic",
 331                 .data           = &panic_timeout,
 332                 .maxlen         = sizeof(int),
 333                 .mode           = 0644,
 334                 .proc_handler   = &proc_dointvec,
 335         },
 336         {
 337                 .ctl_name       = KERN_CORE_USES_PID,
 338                 .procname       = "core_uses_pid",
 339                 .data           = &core_uses_pid,
 340                 .maxlen         = sizeof(int),
 341                 .mode           = 0644,
 342                 .proc_handler   = &proc_dointvec,
 343         },
 344 #ifdef CONFIG_AUDITSYSCALL
 345         {
 346                 .ctl_name       = CTL_UNNUMBERED,
 347                 .procname       = "audit_argv_kb",
 348                 .data           = &audit_argv_kb,
 349                 .maxlen         = sizeof(int),
 350                 .mode           = 0644,
 351                 .proc_handler   = &proc_dointvec,
 352         },
 353 #endif
 354         {
 355                 .ctl_name       = KERN_CORE_PATTERN,
 356                 .procname       = "core_pattern",
 357                 .data           = core_pattern,
 358                 .maxlen         = CORENAME_MAX_SIZE,
 359                 .mode           = 0644,
 360                 .proc_handler   = &proc_dostring,
 361                 .strategy       = &sysctl_string,
 362         },
 363 #ifdef CONFIG_PROC_SYSCTL
 364         {
 365                 .procname       = "tainted",
 366                 .data           = &tainted,
 367                 .maxlen         = sizeof(int),
 368                 .mode           = 0644,
 369                 .proc_handler   = &proc_dointvec_taint,
 370         },
 371 #endif
 372         {
 373                 .procname       = "cap-bound",
 374                 .data           = &cap_bset,
 375                 .maxlen         = sizeof(kernel_cap_t),
 376                 .mode           = 0600,
 377                 .proc_handler   = &proc_dointvec_bset,
 378         },
 379 #ifdef CONFIG_BLK_DEV_INITRD
 380         {
 381                 .ctl_name       = KERN_REALROOTDEV,
 382                 .procname       = "real-root-dev",
 383                 .data           = &real_root_dev,
 384                 .maxlen         = sizeof(int),
 385                 .mode           = 0644,
 386                 .proc_handler   = &proc_dointvec,
 387         },
 388 #endif
 389         {
 390                 .ctl_name       = CTL_UNNUMBERED,
 391                 .procname       = "print-fatal-signals",
 392                 .data           = &print_fatal_signals,
 393                 .maxlen         = sizeof(int),
 394                 .mode           = 0644,
 395                 .proc_handler   = &proc_dointvec,
 396         },
 397 #ifdef __sparc__
 398         {
 399                 .ctl_name       = KERN_SPARC_REBOOT,
 400                 .procname       = "reboot-cmd",
 401                 .data           = reboot_command,
 402                 .maxlen         = 256,
 403                 .mode           = 0644,
 404                 .proc_handler   = &proc_dostring,
 405                 .strategy       = &sysctl_string,
 406         },
 407         {
 408                 .ctl_name       = KERN_SPARC_STOP_A,
 409                 .procname       = "stop-a",
 410                 .data           = &stop_a_enabled,
 411                 .maxlen         = sizeof (int),
 412                 .mode           = 0644,
 413                 .proc_handler   = &proc_dointvec,
 414         },
 415         {
 416                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 417                 .procname       = "scons-poweroff",
 418                 .data           = &scons_pwroff,
 419                 .maxlen         = sizeof (int),
 420                 .mode           = 0644,
 421                 .proc_handler   = &proc_dointvec,
 422         },
 423 #endif
 424 #ifdef __hppa__
 425         {
 426                 .ctl_name       = KERN_HPPA_PWRSW,
 427                 .procname       = "soft-power",
 428                 .data           = &pwrsw_enabled,
 429                 .maxlen         = sizeof (int),
 430                 .mode           = 0644,
 431                 .proc_handler   = &proc_dointvec,
 432         },
 433         {
 434                 .ctl_name       = KERN_HPPA_UNALIGNED,
 435                 .procname       = "unaligned-trap",
 436                 .data           = &unaligned_enabled,
 437                 .maxlen         = sizeof (int),
 438                 .mode           = 0644,
 439                 .proc_handler   = &proc_dointvec,
 440         },
 441 #endif
 442         {
 443                 .ctl_name       = KERN_CTLALTDEL,
 444                 .procname       = "ctrl-alt-del",
 445                 .data           = &C_A_D,
 446                 .maxlen         = sizeof(int),
 447                 .mode           = 0644,
 448                 .proc_handler   = &proc_dointvec,
 449         },
 450         {
 451                 .ctl_name       = KERN_PRINTK,
 452                 .procname       = "printk",
 453                 .data           = &console_loglevel,
 454                 .maxlen         = 4*sizeof(int),
 455                 .mode           = 0644,
 456                 .proc_handler   = &proc_dointvec,
 457         },
 458 #ifdef CONFIG_KMOD
 459         {
 460                 .ctl_name       = KERN_MODPROBE,
 461                 .procname       = "modprobe",
 462                 .data           = &modprobe_path,
 463                 .maxlen         = KMOD_PATH_LEN,
 464                 .mode           = 0644,
 465                 .proc_handler   = &proc_dostring,
 466                 .strategy       = &sysctl_string,
 467         },
 468 #endif
 469 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 470         {
 471                 .ctl_name       = KERN_HOTPLUG,
 472                 .procname       = "hotplug",
 473                 .data           = &uevent_helper,
 474                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 475                 .mode           = 0644,
 476                 .proc_handler   = &proc_dostring,
 477                 .strategy       = &sysctl_string,
 478         },
 479 #endif
 480 #ifdef CONFIG_CHR_DEV_SG
 481         {
 482                 .ctl_name       = KERN_SG_BIG_BUFF,
 483                 .procname       = "sg-big-buff",
 484                 .data           = &sg_big_buff,
 485                 .maxlen         = sizeof (int),
 486                 .mode           = 0444,
 487                 .proc_handler   = &proc_dointvec,
 488         },
 489 #endif
 490 #ifdef CONFIG_BSD_PROCESS_ACCT
 491         {
 492                 .ctl_name       = KERN_ACCT,
 493                 .procname       = "acct",
 494                 .data           = &acct_parm,
 495                 .maxlen         = 3*sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = &proc_dointvec,
 498         },
 499 #endif
 500 #ifdef CONFIG_MAGIC_SYSRQ
 501         {
 502                 .ctl_name       = KERN_SYSRQ,
 503                 .procname       = "sysrq",
 504                 .data           = &__sysrq_enabled,
 505                 .maxlen         = sizeof (int),
 506                 .mode           = 0644,
 507                 .proc_handler   = &proc_dointvec,
 508         },
 509 #endif
 510 #ifdef CONFIG_PROC_SYSCTL
 511         {
 512                 .ctl_name       = KERN_CADPID,
 513                 .procname       = "cad_pid",
 514                 .data           = NULL,
 515                 .maxlen         = sizeof (int),
 516                 .mode           = 0600,
 517                 .proc_handler   = &proc_do_cad_pid,
 518         },
 519 #endif
 520         {
 521                 .ctl_name       = KERN_MAX_THREADS,
 522                 .procname       = "threads-max",
 523                 .data           = &max_threads,
 524                 .maxlen         = sizeof(int),
 525                 .mode           = 0644,
 526                 .proc_handler   = &proc_dointvec,
 527         },
 528         {
 529                 .ctl_name       = KERN_RANDOM,
 530                 .procname       = "random",
 531                 .mode           = 0555,
 532                 .child          = random_table,
 533         },
 534         {
 535                 .ctl_name       = KERN_OVERFLOWUID,
 536                 .procname       = "overflowuid",
 537                 .data           = &overflowuid,
 538                 .maxlen         = sizeof(int),
 539                 .mode           = 0644,
 540                 .proc_handler   = &proc_dointvec_minmax,
 541                 .strategy       = &sysctl_intvec,
 542                 .extra1         = &minolduid,
 543                 .extra2         = &maxolduid,
 544         },
 545         {
 546                 .ctl_name       = KERN_OVERFLOWGID,
 547                 .procname       = "overflowgid",
 548                 .data           = &overflowgid,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = &proc_dointvec_minmax,
 552                 .strategy       = &sysctl_intvec,
 553                 .extra1         = &minolduid,
 554                 .extra2         = &maxolduid,
 555         },
 556 #ifdef CONFIG_S390
 557 #ifdef CONFIG_MATHEMU
 558         {
 559                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 560                 .procname       = "ieee_emulation_warnings",
 561                 .data           = &sysctl_ieee_emulation_warnings,
 562                 .maxlen         = sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = &proc_dointvec,
 565         },
 566 #endif
 567 #ifdef CONFIG_NO_IDLE_HZ
 568         {
 569                 .ctl_name       = KERN_HZ_TIMER,
 570                 .procname       = "hz_timer",
 571                 .data           = &sysctl_hz_timer,
 572                 .maxlen         = sizeof(int),
 573                 .mode           = 0644,
 574                 .proc_handler   = &proc_dointvec,
 575         },
 576 #endif
 577         {
 578                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 579                 .procname       = "userprocess_debug",
 580                 .data           = &sysctl_userprocess_debug,
 581                 .maxlen         = sizeof(int),
 582                 .mode           = 0644,
 583                 .proc_handler   = &proc_dointvec,
 584         },
 585 #endif
 586         {
 587                 .ctl_name       = KERN_PIDMAX,
 588                 .procname       = "pid_max",
 589                 .data           = &pid_max,
 590                 .maxlen         = sizeof (int),
 591                 .mode           = 0644,
 592                 .proc_handler   = &proc_dointvec_minmax,
 593                 .strategy       = sysctl_intvec,
 594                 .extra1         = &pid_max_min,
 595                 .extra2         = &pid_max_max,
 596         },
 597         {
 598                 .ctl_name       = KERN_PANIC_ON_OOPS,
 599                 .procname       = "panic_on_oops",
 600                 .data           = &panic_on_oops,
 601                 .maxlen         = sizeof(int),
 602                 .mode           = 0644,
 603                 .proc_handler   = &proc_dointvec,
 604         },
 605         {
 606                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 607                 .procname       = "printk_ratelimit",
 608                 .data           = &printk_ratelimit_jiffies,
 609                 .maxlen         = sizeof(int),
 610                 .mode           = 0644,
 611                 .proc_handler   = &proc_dointvec_jiffies,
 612                 .strategy       = &sysctl_jiffies,
 613         },
 614         {
 615                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 616                 .procname       = "printk_ratelimit_burst",
 617                 .data           = &printk_ratelimit_burst,
 618                 .maxlen         = sizeof(int),
 619                 .mode           = 0644,
 620                 .proc_handler   = &proc_dointvec,
 621         },
 622         {
 623                 .ctl_name       = KERN_NGROUPS_MAX,
 624                 .procname       = "ngroups_max",
 625                 .data           = &ngroups_max,
 626                 .maxlen         = sizeof (int),
 627                 .mode           = 0444,
 628                 .proc_handler   = &proc_dointvec,
 629         },
 630 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 631         {
 632                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 633                 .procname       = "unknown_nmi_panic",
 634                 .data           = &unknown_nmi_panic,
 635                 .maxlen         = sizeof (int),
 636                 .mode           = 0644,
 637                 .proc_handler   = &proc_dointvec,
 638         },
 639         {
 640                 .procname       = "nmi_watchdog",
 641                 .data           = &nmi_watchdog_enabled,
 642                 .maxlen         = sizeof (int),
 643                 .mode           = 0644,
 644                 .proc_handler   = &proc_nmi_enabled,
 645         },
 646 #endif
 647 #if defined(CONFIG_X86)
 648         {
 649                 .ctl_name       = KERN_PANIC_ON_NMI,
 650                 .procname       = "panic_on_unrecovered_nmi",
 651                 .data           = &panic_on_unrecovered_nmi,
 652                 .maxlen         = sizeof(int),
 653                 .mode           = 0644,
 654                 .proc_handler   = &proc_dointvec,
 655         },
 656         {
 657                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 658                 .procname       = "bootloader_type",
 659                 .data           = &bootloader_type,
 660                 .maxlen         = sizeof (int),
 661                 .mode           = 0444,
 662                 .proc_handler   = &proc_dointvec,
 663         },
 664         {
 665                 .ctl_name       = CTL_UNNUMBERED,
 666                 .procname       = "kstack_depth_to_print",
 667                 .data           = &kstack_depth_to_print,
 668                 .maxlen         = sizeof(int),
 669                 .mode           = 0644,
 670                 .proc_handler   = &proc_dointvec,
 671         },
 672 #endif
 673 #if defined(CONFIG_MMU)
 674         {
 675                 .ctl_name       = KERN_RANDOMIZE,
 676                 .procname       = "randomize_va_space",
 677                 .data           = &randomize_va_space,
 678                 .maxlen         = sizeof(int),
 679                 .mode           = 0644,
 680                 .proc_handler   = &proc_dointvec,
 681         },
 682 #endif
 683 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 684         {
 685                 .ctl_name       = KERN_SPIN_RETRY,
 686                 .procname       = "spin_retry",
 687                 .data           = &spin_retry,
 688                 .maxlen         = sizeof (int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_dointvec,
 691         },
 692 #endif
 693 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 694         {
 695                 .procname       = "acpi_video_flags",
 696                 .data           = &acpi_realmode_flags,
 697                 .maxlen         = sizeof (unsigned long),
 698                 .mode           = 0644,
 699                 .proc_handler   = &proc_doulongvec_minmax,
 700         },
 701 #endif
 702 #ifdef CONFIG_IA64
 703         {
 704                 .ctl_name       = KERN_IA64_UNALIGNED,
 705                 .procname       = "ignore-unaligned-usertrap",
 706                 .data           = &no_unaligned_warning,
 707                 .maxlen         = sizeof (int),
 708                 .mode           = 0644,
 709                 .proc_handler   = &proc_dointvec,
 710         },
 711 #endif
 712 #ifdef CONFIG_DETECT_SOFTLOCKUP
 713         {
 714                 .ctl_name       = CTL_UNNUMBERED,
 715                 .procname       = "softlockup_thresh",
 716                 .data           = &softlockup_thresh,
 717                 .maxlen         = sizeof(int),
 718                 .mode           = 0644,
 719                 .proc_handler   = &proc_dointvec_minmax,
 720                 .strategy       = &sysctl_intvec,
 721                 .extra1         = &one,
 722                 .extra2         = &sixty,
 723         },
 724 #endif
 725 #ifdef CONFIG_COMPAT
 726         {
 727                 .ctl_name       = KERN_COMPAT_LOG,
 728                 .procname       = "compat-log",
 729                 .data           = &compat_log,
 730                 .maxlen         = sizeof (int),
 731                 .mode           = 0644,
 732                 .proc_handler   = &proc_dointvec,
 733         },
 734 #endif
 735 #ifdef CONFIG_RT_MUTEXES
 736         {
 737                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 738                 .procname       = "max_lock_depth",
 739                 .data           = &max_lock_depth,
 740                 .maxlen         = sizeof(int),
 741                 .mode           = 0644,
 742                 .proc_handler   = &proc_dointvec,
 743         },
 744 #endif
 745 #ifdef CONFIG_PROC_FS
 746         {
 747                 .ctl_name       = CTL_UNNUMBERED,
 748                 .procname       = "maps_protect",
 749                 .data           = &maps_protect,
 750                 .maxlen         = sizeof(int),
 751                 .mode           = 0644,
 752                 .proc_handler   = &proc_dointvec,
 753         },
 754 #endif
 755         {
 756                 .ctl_name       = CTL_UNNUMBERED,
 757                 .procname       = "poweroff_cmd",
 758                 .data           = &poweroff_cmd,
 759                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 760                 .mode           = 0644,
 761                 .proc_handler   = &proc_dostring,
 762                 .strategy       = &sysctl_string,
 763         },
 764 /*
 765  * NOTE: do not add new entries to this table unless you have read
 766  * Documentation/sysctl/ctl_unnumbered.txt
 767  */
 768         { .ctl_name = 0 }
 769 };
 770
 771 static struct ctl_table vm_table[] = {
 772         {
 773                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 774                 .procname       = "overcommit_memory",
 775                 .data           = &sysctl_overcommit_memory,
 776                 .maxlen         = sizeof(sysctl_overcommit_memory),
 777                 .mode           = 0644,
 778                 .proc_handler   = &proc_dointvec,
 779         },
 780         {
 781                 .ctl_name       = VM_PANIC_ON_OOM,
 782                 .procname       = "panic_on_oom",
 783                 .data           = &sysctl_panic_on_oom,
 784                 .maxlen         = sizeof(sysctl_panic_on_oom),
 785                 .mode           = 0644,
 786                 .proc_handler   = &proc_dointvec,
 787         },
 788         {
 789                 .ctl_name       = CTL_UNNUMBERED,
 790                 .procname       = "oom_kill_allocating_task",
 791                 .data           = &sysctl_oom_kill_allocating_task,
 792                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 793                 .mode           = 0644,
 794                 .proc_handler   = &proc_dointvec,
 795         },
 796         {
 797                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 798                 .procname       = "overcommit_ratio",
 799                 .data           = &sysctl_overcommit_ratio,
 800                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 801                 .mode           = 0644,
 802                 .proc_handler   = &proc_dointvec,
 803         },
 804         {
 805                 .ctl_name       = VM_PAGE_CLUSTER,
 806                 .procname       = "page-cluster",
 807                 .data           = &page_cluster,
 808                 .maxlen         = sizeof(int),
 809                 .mode           = 0644,
 810                 .proc_handler   = &proc_dointvec,
 811         },
 812         {
 813                 .ctl_name       = VM_DIRTY_BACKGROUND,
 814                 .procname       = "dirty_background_ratio",
 815                 .data           = &dirty_background_ratio,
 816                 .maxlen         = sizeof(dirty_background_ratio),
 817                 .mode           = 0644,
 818                 .proc_handler   = &proc_dointvec_minmax,
 819                 .strategy       = &sysctl_intvec,
 820                 .extra1         = &zero,
 821                 .extra2         = &one_hundred,
 822         },
 823         {
 824                 .ctl_name       = VM_DIRTY_RATIO,
 825                 .procname       = "dirty_ratio",
 826                 .data           = &vm_dirty_ratio,
 827                 .maxlen         = sizeof(vm_dirty_ratio),
 828                 .mode           = 0644,
 829                 .proc_handler   = &dirty_ratio_handler,
 830                 .strategy       = &sysctl_intvec,
 831                 .extra1         = &zero,
 832                 .extra2         = &one_hundred,
 833         },
 834         {
 835                 .procname       = "dirty_writeback_centisecs",
 836                 .data           = &dirty_writeback_interval,
 837                 .maxlen         = sizeof(dirty_writeback_interval),
 838                 .mode           = 0644,
 839                 .proc_handler   = &dirty_writeback_centisecs_handler,
 840         },
 841         {
 842                 .procname       = "dirty_expire_centisecs",
 843                 .data           = &dirty_expire_interval,
 844                 .maxlen         = sizeof(dirty_expire_interval),
 845                 .mode           = 0644,
 846                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 847         },
 848         {
 849                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 850                 .procname       = "nr_pdflush_threads",
 851                 .data           = &nr_pdflush_threads,
 852                 .maxlen         = sizeof nr_pdflush_threads,
 853                 .mode           = 0444 /* read-only*/,
 854                 .proc_handler   = &proc_dointvec,
 855         },
 856         {
 857                 .ctl_name       = VM_SWAPPINESS,
 858                 .procname       = "swappiness",
 859                 .data           = &vm_swappiness,
 860                 .maxlen         = sizeof(vm_swappiness),
 861                 .mode           = 0644,
 862                 .proc_handler   = &proc_dointvec_minmax,
 863                 .strategy       = &sysctl_intvec,
 864                 .extra1         = &zero,
 865                 .extra2         = &one_hundred,
 866         },
 867 #ifdef CONFIG_HUGETLB_PAGE
 868          {
 869                 .procname       = "nr_hugepages",
 870                 .data           = &max_huge_pages,
 871                 .maxlen         = sizeof(unsigned long),
 872                 .mode           = 0644,
 873                 .proc_handler   = &hugetlb_sysctl_handler,
 874                 .extra1         = (void *)&hugetlb_zero,
 875                 .extra2         = (void *)&hugetlb_infinity,
 876          },
 877          {
 878                 .ctl_name       = VM_HUGETLB_GROUP,
 879                 .procname       = "hugetlb_shm_group",
 880                 .data           = &sysctl_hugetlb_shm_group,
 881                 .maxlen         = sizeof(gid_t),
 882                 .mode           = 0644,
 883                 .proc_handler   = &proc_dointvec,
 884          },
 885          {
 886                 .ctl_name       = CTL_UNNUMBERED,
 887                 .procname       = "hugepages_treat_as_movable",
 888                 .data           = &hugepages_treat_as_movable,
 889                 .maxlen         = sizeof(int),
 890                 .mode           = 0644,
 891                 .proc_handler   = &hugetlb_treat_movable_handler,
 892         },
 893         {
 894                 .ctl_name       = CTL_UNNUMBERED,
 895                 .procname       = "hugetlb_dynamic_pool",
 896                 .data           = &hugetlb_dynamic_pool,
 897                 .maxlen         = sizeof(hugetlb_dynamic_pool),
 898                 .mode           = 0644,
 899                 .proc_handler   = &proc_dointvec,
 900         },
 901 #endif
 902         {
 903                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 904                 .procname       = "lowmem_reserve_ratio",
 905                 .data           = &sysctl_lowmem_reserve_ratio,
 906                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 907                 .mode           = 0644,
 908                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 909                 .strategy       = &sysctl_intvec,
 910         },
 911         {
 912                 .ctl_name       = VM_DROP_PAGECACHE,
 913                 .procname       = "drop_caches",
 914                 .data           = &sysctl_drop_caches,
 915                 .maxlen         = sizeof(int),
 916                 .mode           = 0644,
 917                 .proc_handler   = drop_caches_sysctl_handler,
 918                 .strategy       = &sysctl_intvec,
 919         },
 920         {
 921                 .ctl_name       = VM_MIN_FREE_KBYTES,
 922                 .procname       = "min_free_kbytes",
 923                 .data           = &min_free_kbytes,
 924                 .maxlen         = sizeof(min_free_kbytes),
 925                 .mode           = 0644,
 926                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 927                 .strategy       = &sysctl_intvec,
 928                 .extra1         = &zero,
 929         },
 930         {
 931                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 932                 .procname       = "percpu_pagelist_fraction",
 933                 .data           = &percpu_pagelist_fraction,
 934                 .maxlen         = sizeof(percpu_pagelist_fraction),
 935                 .mode           = 0644,
 936                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 937                 .strategy       = &sysctl_intvec,
 938                 .extra1         = &min_percpu_pagelist_fract,
 939         },
 940 #ifdef CONFIG_MMU
 941         {
 942                 .ctl_name       = VM_MAX_MAP_COUNT,
 943                 .procname       = "max_map_count",
 944                 .data           = &sysctl_max_map_count,
 945                 .maxlen         = sizeof(sysctl_max_map_count),
 946                 .mode           = 0644,
 947                 .proc_handler   = &proc_dointvec
 948         },
 949 #endif
 950         {
 951                 .ctl_name       = VM_LAPTOP_MODE,
 952                 .procname       = "laptop_mode",
 953                 .data           = &laptop_mode,
 954                 .maxlen         = sizeof(laptop_mode),
 955                 .mode           = 0644,
 956                 .proc_handler   = &proc_dointvec_jiffies,
 957                 .strategy       = &sysctl_jiffies,
 958         },
 959         {
 960                 .ctl_name       = VM_BLOCK_DUMP,
 961                 .procname       = "block_dump",
 962                 .data           = &block_dump,
 963                 .maxlen         = sizeof(block_dump),
 964                 .mode           = 0644,
 965                 .proc_handler   = &proc_dointvec,
 966                 .strategy       = &sysctl_intvec,
 967                 .extra1         = &zero,
 968         },
 969         {
 970                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 971                 .procname       = "vfs_cache_pressure",
 972                 .data           = &sysctl_vfs_cache_pressure,
 973                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 974                 .mode           = 0644,
 975                 .proc_handler   = &proc_dointvec,
 976                 .strategy       = &sysctl_intvec,
 977                 .extra1         = &zero,
 978         },
 979 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 980         {
 981                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 982                 .procname       = "legacy_va_layout",
 983                 .data           = &sysctl_legacy_va_layout,
 984                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 985                 .mode           = 0644,
 986                 .proc_handler   = &proc_dointvec,
 987                 .strategy       = &sysctl_intvec,
 988                 .extra1         = &zero,
 989         },
 990 #endif
 991 #ifdef CONFIG_NUMA
 992         {
 993                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
 994                 .procname       = "zone_reclaim_mode",
 995                 .data           = &zone_reclaim_mode,
 996                 .maxlen         = sizeof(zone_reclaim_mode),
 997                 .mode           = 0644,
 998                 .proc_handler   = &proc_dointvec,
 999                 .strategy       = &sysctl_intvec,
1000                 .extra1         = &zero,
1001         },
1002         {
1003                 .ctl_name       = VM_MIN_UNMAPPED,
1004                 .procname       = "min_unmapped_ratio",
1005                 .data           = &sysctl_min_unmapped_ratio,
1006                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1007                 .mode           = 0644,
1008                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1009                 .strategy       = &sysctl_intvec,
1010                 .extra1         = &zero,
1011                 .extra2         = &one_hundred,
1012         },
1013         {
1014                 .ctl_name       = VM_MIN_SLAB,
1015                 .procname       = "min_slab_ratio",
1016                 .data           = &sysctl_min_slab_ratio,
1017                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1018                 .mode           = 0644,
1019                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1020                 .strategy       = &sysctl_intvec,
1021                 .extra1         = &zero,
1022                 .extra2         = &one_hundred,
1023         },
1024 #endif
1025 #ifdef CONFIG_SMP
1026         {
1027                 .ctl_name       = CTL_UNNUMBERED,
1028                 .procname       = "stat_interval",
1029                 .data           = &sysctl_stat_interval,
1030                 .maxlen         = sizeof(sysctl_stat_interval),
1031                 .mode           = 0644,
1032                 .proc_handler   = &proc_dointvec_jiffies,
1033                 .strategy       = &sysctl_jiffies,
1034         },
1035 #endif
1036 #ifdef CONFIG_SECURITY
1037         {
1038                 .ctl_name       = CTL_UNNUMBERED,
1039                 .procname       = "mmap_min_addr",
1040                 .data           = &mmap_min_addr,
1041                 .maxlen         = sizeof(unsigned long),
1042                 .mode           = 0644,
1043                 .proc_handler   = &proc_doulongvec_minmax,
1044         },
1045 #endif
1046 #ifdef CONFIG_NUMA
1047         {
1048                 .ctl_name       = CTL_UNNUMBERED,
1049                 .procname       = "numa_zonelist_order",
1050                 .data           = &numa_zonelist_order,
1051                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1052                 .mode           = 0644,
1053                 .proc_handler   = &numa_zonelist_order_handler,
1054                 .strategy       = &sysctl_string,
1055         },
1056 #endif
1057 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1058    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1059         {
1060                 .ctl_name       = VM_VDSO_ENABLED,
1061                 .procname       = "vdso_enabled",
1062                 .data           = &vdso_enabled,
1063                 .maxlen         = sizeof(vdso_enabled),
1064                 .mode           = 0644,
1065                 .proc_handler   = &proc_dointvec,
1066                 .strategy       = &sysctl_intvec,
1067                 .extra1         = &zero,
1068         },
1069 #endif
1070 /*
1071  * NOTE: do not add new entries to this table unless you have read
1072  * Documentation/sysctl/ctl_unnumbered.txt
1073  */
1074         { .ctl_name = 0 }
1075 };
1076
1077 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1078 static struct ctl_table binfmt_misc_table[] = {
1079         { .ctl_name = 0 }
1080 };
1081 #endif
1082
1083 static struct ctl_table fs_table[] = {
1084         {
1085                 .ctl_name       = FS_NRINODE,
1086                 .procname       = "inode-nr",
1087                 .data           = &inodes_stat,
1088                 .maxlen         = 2*sizeof(int),
1089                 .mode           = 0444,
1090                 .proc_handler   = &proc_dointvec,
1091         },
1092         {
1093                 .ctl_name       = FS_STATINODE,
1094                 .procname       = "inode-state",
1095                 .data           = &inodes_stat,
1096                 .maxlen         = 7*sizeof(int),
1097                 .mode           = 0444,
1098                 .proc_handler   = &proc_dointvec,
1099         },
1100         {
1101                 .procname       = "file-nr",
1102                 .data           = &files_stat,
1103                 .maxlen         = 3*sizeof(int),
1104                 .mode           = 0444,
1105                 .proc_handler   = &proc_nr_files,
1106         },
1107         {
1108                 .ctl_name       = FS_MAXFILE,
1109                 .procname       = "file-max",
1110                 .data           = &files_stat.max_files,
1111                 .maxlen         = sizeof(int),
1112                 .mode           = 0644,
1113                 .proc_handler   = &proc_dointvec,
1114         },
1115         {
1116                 .ctl_name       = FS_DENTRY,
1117                 .procname       = "dentry-state",
1118                 .data           = &dentry_stat,
1119                 .maxlen         = 6*sizeof(int),
1120                 .mode           = 0444,
1121                 .proc_handler   = &proc_dointvec,
1122         },
1123         {
1124                 .ctl_name       = FS_OVERFLOWUID,
1125                 .procname       = "overflowuid",
1126                 .data           = &fs_overflowuid,
1127                 .maxlen         = sizeof(int),
1128                 .mode           = 0644,
1129                 .proc_handler   = &proc_dointvec_minmax,
1130                 .strategy       = &sysctl_intvec,
1131                 .extra1         = &minolduid,
1132                 .extra2         = &maxolduid,
1133         },
1134         {
1135                 .ctl_name       = FS_OVERFLOWGID,
1136                 .procname       = "overflowgid",
1137                 .data           = &fs_overflowgid,
1138                 .maxlen         = sizeof(int),
1139                 .mode           = 0644,
1140                 .proc_handler   = &proc_dointvec_minmax,
1141                 .strategy       = &sysctl_intvec,
1142                 .extra1         = &minolduid,
1143                 .extra2         = &maxolduid,
1144         },
1145         {
1146                 .ctl_name       = FS_LEASES,
1147                 .procname       = "leases-enable",
1148                 .data           = &leases_enable,
1149                 .maxlen         = sizeof(int),
1150                 .mode           = 0644,
1151                 .proc_handler   = &proc_dointvec,
1152         },
1153 #ifdef CONFIG_DNOTIFY
1154         {
1155                 .ctl_name       = FS_DIR_NOTIFY,
1156                 .procname       = "dir-notify-enable",
1157                 .data           = &dir_notify_enable,
1158                 .maxlen         = sizeof(int),
1159                 .mode           = 0644,
1160                 .proc_handler   = &proc_dointvec,
1161         },
1162 #endif
1163 #ifdef CONFIG_MMU
1164         {
1165                 .ctl_name       = FS_LEASE_TIME,
1166                 .procname       = "lease-break-time",
1167                 .data           = &lease_break_time,
1168                 .maxlen         = sizeof(int),
1169                 .mode           = 0644,
1170                 .proc_handler   = &proc_dointvec_minmax,
1171                 .strategy       = &sysctl_intvec,
1172                 .extra1         = &zero,
1173                 .extra2         = &two,
1174         },
1175         {
1176                 .procname       = "aio-nr",
1177                 .data           = &aio_nr,
1178                 .maxlen         = sizeof(aio_nr),
1179                 .mode           = 0444,
1180                 .proc_handler   = &proc_doulongvec_minmax,
1181         },
1182         {
1183                 .procname       = "aio-max-nr",
1184                 .data           = &aio_max_nr,
1185                 .maxlen         = sizeof(aio_max_nr),
1186                 .mode           = 0644,
1187                 .proc_handler   = &proc_doulongvec_minmax,
1188         },
1189 #ifdef CONFIG_INOTIFY_USER
1190         {
1191                 .ctl_name       = FS_INOTIFY,
1192                 .procname       = "inotify",
1193                 .mode           = 0555,
1194                 .child          = inotify_table,
1195         },
1196 #endif
1197 #endif
1198         {
1199                 .ctl_name       = KERN_SETUID_DUMPABLE,
1200                 .procname       = "suid_dumpable",
1201                 .data           = &suid_dumpable,
1202                 .maxlen         = sizeof(int),
1203                 .mode           = 0644,
1204                 .proc_handler   = &proc_dointvec,
1205         },
1206 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1207         {
1208                 .ctl_name       = CTL_UNNUMBERED,
1209                 .procname       = "binfmt_misc",
1210                 .mode           = 0555,
1211                 .child          = binfmt_misc_table,
1212         },
1213 #endif
1214 /*
1215  * NOTE: do not add new entries to this table unless you have read
1216  * Documentation/sysctl/ctl_unnumbered.txt
1217  */
1218         { .ctl_name = 0 }
1219 };
1220
1221 static struct ctl_table debug_table[] = {
1222 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1223         {
1224                 .ctl_name       = CTL_UNNUMBERED,
1225                 .procname       = "exception-trace",
1226                 .data           = &show_unhandled_signals,
1227                 .maxlen         = sizeof(int),
1228                 .mode           = 0644,
1229                 .proc_handler   = proc_dointvec
1230         },
1231 #endif
1232         { .ctl_name = 0 }
1233 };
1234
1235 static struct ctl_table dev_table[] = {
1236         { .ctl_name = 0 }
1237 };
1238
1239 static DEFINE_SPINLOCK(sysctl_lock);
1240
1241 /* called under sysctl_lock */
1242 static int use_table(struct ctl_table_header *p)
1243 {
1244         if (unlikely(p->unregistering))
1245                 return 0;
1246         p->used++;
1247         return 1;
1248 }
1249
1250 /* called under sysctl_lock */
1251 static void unuse_table(struct ctl_table_header *p)
1252 {
1253         if (!--p->used)
1254                 if (unlikely(p->unregistering))
1255                         complete(p->unregistering);
1256 }
1257
1258 /* called under sysctl_lock, will reacquire if has to wait */
1259 static void start_unregistering(struct ctl_table_header *p)
1260 {
1261         /*
1262          * if p->used is 0, nobody will ever touch that entry again;
1263          * we'll eliminate all paths to it before dropping sysctl_lock
1264          */
1265         if (unlikely(p->used)) {
1266                 struct completion wait;
1267                 init_completion(&wait);
1268                 p->unregistering = &wait;
1269                 spin_unlock(&sysctl_lock);
1270                 wait_for_completion(&wait);
1271                 spin_lock(&sysctl_lock);
1272         }
1273         /*
1274          * do not remove from the list until nobody holds it; walking the
1275          * list in do_sysctl() relies on that.
1276          */
1277         list_del_init(&p->ctl_entry);
1278 }
1279
1280 void sysctl_head_finish(struct ctl_table_header *head)
1281 {
1282         if (!head)
1283                 return;
1284         spin_lock(&sysctl_lock);
1285         unuse_table(head);
1286         spin_unlock(&sysctl_lock);
1287 }
1288
1289 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1290 {
1291         struct ctl_table_header *head;
1292         struct list_head *tmp;
1293         spin_lock(&sysctl_lock);
1294         if (prev) {
1295                 tmp = &prev->ctl_entry;
1296                 unuse_table(prev);
1297                 goto next;
1298         }
1299         tmp = &root_table_header.ctl_entry;
1300         for (;;) {
1301                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1302
1303                 if (!use_table(head))
1304                         goto next;
1305                 spin_unlock(&sysctl_lock);
1306                 return head;
1307         next:
1308                 tmp = tmp->next;
1309                 if (tmp == &root_table_header.ctl_entry)
1310                         break;
1311         }
1312         spin_unlock(&sysctl_lock);
1313         return NULL;
1314 }
1315
1316 #ifdef CONFIG_SYSCTL_SYSCALL
1317 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1318                void __user *newval, size_t newlen)
1319 {
1320         struct ctl_table_header *head;
1321         int error = -ENOTDIR;
1322
1323         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1324                 return -ENOTDIR;
1325         if (oldval) {
1326                 int old_len;
1327                 if (!oldlenp || get_user(old_len, oldlenp))
1328                         return -EFAULT;
1329         }
1330
1331         for (head = sysctl_head_next(NULL); head;
1332                         head = sysctl_head_next(head)) {
1333                 error = parse_table(name, nlen, oldval, oldlenp,
1334                                         newval, newlen, head->ctl_table);
1335                 if (error != -ENOTDIR) {
1336                         sysctl_head_finish(head);
1337                         break;
1338                 }
1339         }
1340         return error;
1341 }
1342
1343 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1344 {
1345         struct __sysctl_args tmp;
1346         int error;
1347
1348         if (copy_from_user(&tmp, args, sizeof(tmp)))
1349                 return -EFAULT;
1350
1351         lock_kernel();
1352         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1353                           tmp.newval, tmp.newlen);
1354         unlock_kernel();
1355         return error;
1356 }
1357 #endif /* CONFIG_SYSCTL_SYSCALL */
1358
1359 /*
1360  * sysctl_perm does NOT grant the superuser all rights automatically, because
1361  * some sysctl variables are readonly even to root.
1362  */
1363
1364 static int test_perm(int mode, int op)
1365 {
1366         if (!current->euid)
1367                 mode >>= 6;
1368         else if (in_egroup_p(0))
1369                 mode >>= 3;
1370         if ((mode & op & 0007) == op)
1371                 return 0;
1372         return -EACCES;
1373 }
1374
1375 int sysctl_perm(struct ctl_table *table, int op)
1376 {
1377         int error;
1378         error = security_sysctl(table, op);
1379         if (error)
1380                 return error;
1381         return test_perm(table->mode, op);
1382 }
1383
1384 #ifdef CONFIG_SYSCTL_SYSCALL
1385 static int parse_table(int __user *name, int nlen,
1386                        void __user *oldval, size_t __user *oldlenp,
1387                        void __user *newval, size_t newlen,
1388                        struct ctl_table *table)
1389 {
1390         int n;
1391 repeat:
1392         if (!nlen)
1393                 return -ENOTDIR;
1394         if (get_user(n, name))
1395                 return -EFAULT;
1396         for ( ; table->ctl_name || table->procname; table++) {
1397                 if (!table->ctl_name)
1398                         continue;
1399                 if (n == table->ctl_name) {
1400                         int error;
1401                         if (table->child) {
1402                                 if (sysctl_perm(table, 001))
1403                                         return -EPERM;
1404                                 name++;
1405                                 nlen--;
1406                                 table = table->child;
1407                                 goto repeat;
1408                         }
1409                         error = do_sysctl_strategy(table, name, nlen,
1410                                                    oldval, oldlenp,
1411                                                    newval, newlen);
1412                         return error;
1413                 }
1414         }
1415         return -ENOTDIR;
1416 }
1417
1418 /* Perform the actual read/write of a sysctl table entry. */
1419 int do_sysctl_strategy (struct ctl_table *table,
1420                         int __user *name, int nlen,
1421                         void __user *oldval, size_t __user *oldlenp,
1422                         void __user *newval, size_t newlen)
1423 {
1424         int op = 0, rc;
1425
1426         if (oldval)
1427                 op |= 004;
1428         if (newval)
1429                 op |= 002;
1430         if (sysctl_perm(table, op))
1431                 return -EPERM;
1432
1433         if (table->strategy) {
1434                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1435                                      newval, newlen);
1436                 if (rc < 0)
1437                         return rc;
1438                 if (rc > 0)
1439                         return 0;
1440         }
1441
1442         /* If there is no strategy routine, or if the strategy returns
1443          * zero, proceed with automatic r/w */
1444         if (table->data && table->maxlen) {
1445                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1446                                  newval, newlen);
1447                 if (rc < 0)
1448                         return rc;
1449         }
1450         return 0;
1451 }
1452 #endif /* CONFIG_SYSCTL_SYSCALL */
1453
1454 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1455 {
1456         for (; table->ctl_name || table->procname; table++) {
1457                 table->parent = parent;
1458                 if (table->child)
1459                         sysctl_set_parent(table, table->child);
1460         }
1461 }
1462
1463 static __init int sysctl_init(void)
1464 {
1465         sysctl_set_parent(NULL, root_table);
1466         return 0;
1467 }
1468
1469 core_initcall(sysctl_init);
1470
1471 /**
1472  * register_sysctl_table - register a sysctl hierarchy
1473  * @table: the top-level table structure
1474  *
1475  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1476  * array. An entry with a ctl_name of 0 terminates the table.
1477  *
1478  * The members of the &struct ctl_table structure are used as follows:
1479  *
1480  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1481  *            must be unique within that level of sysctl
1482  *
1483  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1484  *            enter a sysctl file
1485  *
1486  * data - a pointer to data for use by proc_handler
1487  *
1488  * maxlen - the maximum size in bytes of the data
1489  *
1490  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1491  *
1492  * child - a pointer to the child sysctl table if this entry is a directory, or
1493  *         %NULL.
1494  *
1495  * proc_handler - the text handler routine (described below)
1496  *
1497  * strategy - the strategy routine (described below)
1498  *
1499  * de - for internal use by the sysctl routines
1500  *
1501  * extra1, extra2 - extra pointers usable by the proc handler routines
1502  *
1503  * Leaf nodes in the sysctl tree will be represented by a single file
1504  * under /proc; non-leaf nodes will be represented by directories.
1505  *
1506  * sysctl(2) can automatically manage read and write requests through
1507  * the sysctl table.  The data and maxlen fields of the ctl_table
1508  * struct enable minimal validation of the values being written to be
1509  * performed, and the mode field allows minimal authentication.
1510  *
1511  * More sophisticated management can be enabled by the provision of a
1512  * strategy routine with the table entry.  This will be called before
1513  * any automatic read or write of the data is performed.
1514  *
1515  * The strategy routine may return
1516  *
1517  * < 0 - Error occurred (error is passed to user process)
1518  *
1519  * 0   - OK - proceed with automatic read or write.
1520  *
1521  * > 0 - OK - read or write has been done by the strategy routine, so
1522  *       return immediately.
1523  *
1524  * There must be a proc_handler routine for any terminal nodes
1525  * mirrored under /proc/sys (non-terminals are handled by a built-in
1526  * directory handler).  Several default handlers are available to
1527  * cover common cases -
1528  *
1529  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1530  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1531  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1532  *
1533  * It is the handler's job to read the input buffer from user memory
1534  * and process it. The handler should return 0 on success.
1535  *
1536  * This routine returns %NULL on a failure to register, and a pointer
1537  * to the table header on success.
1538  */
1539 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1540 {
1541         struct ctl_table_header *tmp;
1542         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1543         if (!tmp)
1544                 return NULL;
1545         tmp->ctl_table = table;
1546         INIT_LIST_HEAD(&tmp->ctl_entry);
1547         tmp->used = 0;
1548         tmp->unregistering = NULL;
1549         sysctl_set_parent(NULL, table);
1550         spin_lock(&sysctl_lock);
1551         list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1552         spin_unlock(&sysctl_lock);
1553         return tmp;
1554 }
1555
1556 /**
1557  * unregister_sysctl_table - unregister a sysctl table hierarchy
1558  * @header: the header returned from register_sysctl_table
1559  *
1560  * Unregisters the sysctl table and all children. proc entries may not
1561  * actually be removed until they are no longer used by anyone.
1562  */
1563 void unregister_sysctl_table(struct ctl_table_header * header)
1564 {
1565         might_sleep();
1566         spin_lock(&sysctl_lock);
1567         start_unregistering(header);
1568         spin_unlock(&sysctl_lock);
1569         kfree(header);
1570 }
1571
1572 #else /* !CONFIG_SYSCTL */
1573 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1574 {
1575         return NULL;
1576 }
1577
1578 void unregister_sysctl_table(struct ctl_table_header * table)
1579 {
1580 }
1581
1582 #endif /* CONFIG_SYSCTL */
1583
1584 /*
1585  * /proc/sys support
1586  */
1587
1588 #ifdef CONFIG_PROC_SYSCTL
1589
1590 static int _proc_do_string(void* data, int maxlen, int write,
1591                            struct file *filp, void __user *buffer,
1592                            size_t *lenp, loff_t *ppos)
1593 {
1594         size_t len;
1595         char __user *p;
1596         char c;
1597
1598         if (!data || !maxlen || !*lenp) {
1599                 *lenp = 0;
1600                 return 0;
1601         }
1602
1603         if (write) {
1604                 len = 0;
1605                 p = buffer;
1606                 while (len < *lenp) {
1607                         if (get_user(c, p++))
1608                                 return -EFAULT;
1609                         if (c == 0 || c == '\n')
1610                                 break;
1611                         len++;
1612                 }
1613                 if (len >= maxlen)
1614                         len = maxlen-1;
1615                 if(copy_from_user(data, buffer, len))
1616                         return -EFAULT;
1617                 ((char *) data)[len] = 0;
1618                 *ppos += *lenp;
1619         } else {
1620                 len = strlen(data);
1621                 if (len > maxlen)
1622                         len = maxlen;
1623
1624                 if (*ppos > len) {
1625                         *lenp = 0;
1626                         return 0;
1627                 }
1628
1629                 data += *ppos;
1630                 len  -= *ppos;
1631
1632                 if (len > *lenp)
1633                         len = *lenp;
1634                 if (len)
1635                         if(copy_to_user(buffer, data, len))
1636                                 return -EFAULT;
1637                 if (len < *lenp) {
1638                         if(put_user('\n', ((char __user *) buffer) + len))
1639                                 return -EFAULT;
1640                         len++;
1641                 }
1642                 *lenp = len;
1643                 *ppos += len;
1644         }
1645         return 0;
1646 }
1647
1648 /**
1649  * proc_dostring - read a string sysctl
1650  * @table: the sysctl table
1651  * @write: %TRUE if this is a write to the sysctl file
1652  * @filp: the file structure
1653  * @buffer: the user buffer
1654  * @lenp: the size of the user buffer
1655  * @ppos: file position
1656  *
1657  * Reads/writes a string from/to the user buffer. If the kernel
1658  * buffer provided is not large enough to hold the string, the
1659  * string is truncated. The copied string is %NULL-terminated.
1660  * If the string is being read by the user process, it is copied
1661  * and a newline '\n' is added. It is truncated if the buffer is
1662  * not large enough.
1663  *
1664  * Returns 0 on success.
1665  */
1666 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1667                   void __user *buffer, size_t *lenp, loff_t *ppos)
1668 {
1669         return _proc_do_string(table->data, table->maxlen, write, filp,
1670                                buffer, lenp, ppos);
1671 }
1672
1673
1674 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1675                                  int *valp,
1676                                  int write, void *data)
1677 {
1678         if (write) {
1679                 *valp = *negp ? -*lvalp : *lvalp;
1680         } else {
1681                 int val = *valp;
1682                 if (val < 0) {
1683                         *negp = -1;
1684                         *lvalp = (unsigned long)-val;
1685                 } else {
1686                         *negp = 0;
1687                         *lvalp = (unsigned long)val;
1688                 }
1689         }
1690         return 0;
1691 }
1692
1693 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1694                   int write, struct file *filp, void __user *buffer,
1695                   size_t *lenp, loff_t *ppos,
1696                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1697                               int write, void *data),
1698                   void *data)
1699 {
1700 #define TMPBUFLEN 21
1701         int *i, vleft, first=1, neg, val;
1702         unsigned long lval;
1703         size_t left, len;
1704
1705         char buf[TMPBUFLEN], *p;
1706         char __user *s = buffer;
1707
1708         if (!tbl_data || !table->maxlen || !*lenp ||
1709             (*ppos && !write)) {
1710                 *lenp = 0;
1711                 return 0;
1712         }
1713
1714         i = (int *) tbl_data;
1715         vleft = table->maxlen / sizeof(*i);
1716         left = *lenp;
1717
1718         if (!conv)
1719                 conv = do_proc_dointvec_conv;
1720
1721         for (; left && vleft--; i++, first=0) {
1722                 if (write) {
1723                         while (left) {
1724                                 char c;
1725                                 if (get_user(c, s))
1726                                         return -EFAULT;
1727                                 if (!isspace(c))
1728                                         break;
1729                                 left--;
1730                                 s++;
1731                         }
1732                         if (!left)
1733                                 break;
1734                         neg = 0;
1735                         len = left;
1736                         if (len > sizeof(buf) - 1)
1737                                 len = sizeof(buf) - 1;
1738                         if (copy_from_user(buf, s, len))
1739                                 return -EFAULT;
1740                         buf[len] = 0;
1741                         p = buf;
1742                         if (*p == '-' && left > 1) {
1743                                 neg = 1;
1744                                 p++;
1745                         }
1746                         if (*p < '0' || *p > '9')
1747                                 break;
1748
1749                         lval = simple_strtoul(p, &p, 0);
1750
1751                         len = p-buf;
1752                         if ((len < left) && *p && !isspace(*p))
1753                                 break;
1754                         if (neg)
1755                                 val = -val;
1756                         s += len;
1757                         left -= len;
1758
1759                         if (conv(&neg, &lval, i, 1, data))
1760                                 break;
1761                 } else {
1762                         p = buf;
1763                         if (!first)
1764                                 *p++ = '\t';
1765
1766                         if (conv(&neg, &lval, i, 0, data))
1767                                 break;
1768
1769                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1770                         len = strlen(buf);
1771                         if (len > left)
1772                                 len = left;
1773                         if(copy_to_user(s, buf, len))
1774                                 return -EFAULT;
1775                         left -= len;
1776                         s += len;
1777                 }
1778         }
1779
1780         if (!write && !first && left) {
1781                 if(put_user('\n', s))
1782                         return -EFAULT;
1783                 left--, s++;
1784         }
1785         if (write) {
1786                 while (left) {
1787                         char c;
1788                         if (get_user(c, s++))
1789                                 return -EFAULT;
1790                         if (!isspace(c))
1791                                 break;
1792                         left--;
1793                 }
1794         }
1795         if (write && first)
1796                 return -EINVAL;
1797         *lenp -= left;
1798         *ppos += *lenp;
1799         return 0;
1800 #undef TMPBUFLEN
1801 }
1802
1803 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1804                   void __user *buffer, size_t *lenp, loff_t *ppos,
1805                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1806                               int write, void *data),
1807                   void *data)
1808 {
1809         return __do_proc_dointvec(table->data, table, write, filp,
1810                         buffer, lenp, ppos, conv, data);
1811 }
1812
1813 /**
1814  * proc_dointvec - read a vector of integers
1815  * @table: the sysctl table
1816  * @write: %TRUE if this is a write to the sysctl file
1817  * @filp: the file structure
1818  * @buffer: the user buffer
1819  * @lenp: the size of the user buffer
1820  * @ppos: file position
1821  *
1822  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1823  * values from/to the user buffer, treated as an ASCII string.
1824  *
1825  * Returns 0 on success.
1826  */
1827 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1828                      void __user *buffer, size_t *lenp, loff_t *ppos)
1829 {
1830     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1831                             NULL,NULL);
1832 }
1833
1834 #define OP_SET  0
1835 #define OP_AND  1
1836 #define OP_OR   2
1837
1838 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1839                                       int *valp,
1840                                       int write, void *data)
1841 {
1842         int op = *(int *)data;
1843         if (write) {
1844                 int val = *negp ? -*lvalp : *lvalp;
1845                 switch(op) {
1846                 case OP_SET:    *valp = val; break;
1847                 case OP_AND:    *valp &= val; break;
1848                 case OP_OR:     *valp |= val; break;
1849                 }
1850         } else {
1851                 int val = *valp;
1852                 if (val < 0) {
1853                         *negp = -1;
1854                         *lvalp = (unsigned long)-val;
1855                 } else {
1856                         *negp = 0;
1857                         *lvalp = (unsigned long)val;
1858                 }
1859         }
1860         return 0;
1861 }
1862
1863 /*
1864  *      init may raise the set.
1865  */
1866
1867 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
1868                         void __user *buffer, size_t *lenp, loff_t *ppos)
1869 {
1870         int op;
1871
1872         if (write && !capable(CAP_SYS_MODULE)) {
1873                 return -EPERM;
1874         }
1875
1876         op = is_init(current) ? OP_SET : OP_AND;
1877         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1878                                 do_proc_dointvec_bset_conv,&op);
1879 }
1880
1881 /*
1882  *      Taint values can only be increased
1883  */
1884 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
1885                                void __user *buffer, size_t *lenp, loff_t *ppos)
1886 {
1887         int op;
1888
1889         if (write && !capable(CAP_SYS_ADMIN))
1890                 return -EPERM;
1891
1892         op = OP_OR;
1893         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1894                                 do_proc_dointvec_bset_conv,&op);
1895 }
1896
1897 struct do_proc_dointvec_minmax_conv_param {
1898         int *min;
1899         int *max;
1900 };
1901
1902 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1903                                         int *valp,
1904                                         int write, void *data)
1905 {
1906         struct do_proc_dointvec_minmax_conv_param *param = data;
1907         if (write) {
1908                 int val = *negp ? -*lvalp : *lvalp;
1909                 if ((param->min && *param->min > val) ||
1910                     (param->max && *param->max < val))
1911                         return -EINVAL;
1912                 *valp = val;
1913         } else {
1914                 int val = *valp;
1915                 if (val < 0) {
1916                         *negp = -1;
1917                         *lvalp = (unsigned long)-val;
1918                 } else {
1919                         *negp = 0;
1920                         *lvalp = (unsigned long)val;
1921                 }
1922         }
1923         return 0;
1924 }
1925
1926 /**
1927  * proc_dointvec_minmax - read a vector of integers with min/max values
1928  * @table: the sysctl table
1929  * @write: %TRUE if this is a write to the sysctl file
1930  * @filp: the file structure
1931  * @buffer: the user buffer
1932  * @lenp: the size of the user buffer
1933  * @ppos: file position
1934  *
1935  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1936  * values from/to the user buffer, treated as an ASCII string.
1937  *
1938  * This routine will ensure the values are within the range specified by
1939  * table->extra1 (min) and table->extra2 (max).
1940  *
1941  * Returns 0 on success.
1942  */
1943 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1944                   void __user *buffer, size_t *lenp, loff_t *ppos)
1945 {
1946         struct do_proc_dointvec_minmax_conv_param param = {
1947                 .min = (int *) table->extra1,
1948                 .max = (int *) table->extra2,
1949         };
1950         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1951                                 do_proc_dointvec_minmax_conv, &param);
1952 }
1953
1954 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1955                                      struct file *filp,
1956                                      void __user *buffer,
1957                                      size_t *lenp, loff_t *ppos,
1958                                      unsigned long convmul,
1959                                      unsigned long convdiv)
1960 {
1961 #define TMPBUFLEN 21
1962         unsigned long *i, *min, *max, val;
1963         int vleft, first=1, neg;
1964         size_t len, left;
1965         char buf[TMPBUFLEN], *p;
1966         char __user *s = buffer;
1967
1968         if (!data || !table->maxlen || !*lenp ||
1969             (*ppos && !write)) {
1970                 *lenp = 0;
1971                 return 0;
1972         }
1973
1974         i = (unsigned long *) data;
1975         min = (unsigned long *) table->extra1;
1976         max = (unsigned long *) table->extra2;
1977         vleft = table->maxlen / sizeof(unsigned long);
1978         left = *lenp;
1979
1980         for (; left && vleft--; i++, min++, max++, first=0) {
1981                 if (write) {
1982                         while (left) {
1983                                 char c;
1984                                 if (get_user(c, s))
1985                                         return -EFAULT;
1986                                 if (!isspace(c))
1987                                         break;
1988                                 left--;
1989                                 s++;
1990                         }
1991                         if (!left)
1992                                 break;
1993                         neg = 0;
1994                         len = left;
1995                         if (len > TMPBUFLEN-1)
1996                                 len = TMPBUFLEN-1;
1997                         if (copy_from_user(buf, s, len))
1998                                 return -EFAULT;
1999                         buf[len] = 0;
2000                         p = buf;
2001                         if (*p == '-' && left > 1) {
2002                                 neg = 1;
2003                                 p++;
2004                         }
2005                         if (*p < '0' || *p > '9')
2006                                 break;
2007                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2008                         len = p-buf;
2009                         if ((len < left) && *p && !isspace(*p))
2010                                 break;
2011                         if (neg)
2012                                 val = -val;
2013                         s += len;
2014                         left -= len;
2015
2016                         if(neg)
2017                                 continue;
2018                         if ((min && val < *min) || (max && val > *max))
2019                                 continue;
2020                         *i = val;
2021                 } else {
2022                         p = buf;
2023                         if (!first)
2024                                 *p++ = '\t';
2025                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2026                         len = strlen(buf);
2027                         if (len > left)
2028                                 len = left;
2029                         if(copy_to_user(s, buf, len))
2030                                 return -EFAULT;
2031                         left -= len;
2032                         s += len;
2033                 }
2034         }
2035
2036         if (!write && !first && left) {
2037                 if(put_user('\n', s))
2038                         return -EFAULT;
2039                 left--, s++;
2040         }
2041         if (write) {
2042                 while (left) {
2043                         char c;
2044                         if (get_user(c, s++))
2045                                 return -EFAULT;
2046                         if (!isspace(c))
2047                                 break;
2048                         left--;
2049                 }
2050         }
2051         if (write && first)
2052                 return -EINVAL;
2053         *lenp -= left;
2054         *ppos += *lenp;
2055         return 0;
2056 #undef TMPBUFLEN
2057 }
2058
2059 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2060                                      struct file *filp,
2061                                      void __user *buffer,
2062                                      size_t *lenp, loff_t *ppos,
2063                                      unsigned long convmul,
2064                                      unsigned long convdiv)
2065 {
2066         return __do_proc_doulongvec_minmax(table->data, table, write,
2067                         filp, buffer, lenp, ppos, convmul, convdiv);
2068 }
2069
2070 /**
2071  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2072  * @table: the sysctl table
2073  * @write: %TRUE if this is a write to the sysctl file
2074  * @filp: the file structure
2075  * @buffer: the user buffer
2076  * @lenp: the size of the user buffer
2077  * @ppos: file position
2078  *
2079  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2080  * values from/to the user buffer, treated as an ASCII string.
2081  *
2082  * This routine will ensure the values are within the range specified by
2083  * table->extra1 (min) and table->extra2 (max).
2084  *
2085  * Returns 0 on success.
2086  */
2087 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2088                            void __user *buffer, size_t *lenp, loff_t *ppos)
2089 {
2090     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2091 }
2092
2093 /**
2094  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2095  * @table: the sysctl table
2096  * @write: %TRUE if this is a write to the sysctl file
2097  * @filp: the file structure
2098  * @buffer: the user buffer
2099  * @lenp: the size of the user buffer
2100  * @ppos: file position
2101  *
2102  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2103  * values from/to the user buffer, treated as an ASCII string. The values
2104  * are treated as milliseconds, and converted to jiffies when they are stored.
2105  *
2106  * This routine will ensure the values are within the range specified by
2107  * table->extra1 (min) and table->extra2 (max).
2108  *
2109  * Returns 0 on success.
2110  */
2111 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2112                                       struct file *filp,
2113                                       void __user *buffer,
2114                                       size_t *lenp, loff_t *ppos)
2115 {
2116     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2117                                      lenp, ppos, HZ, 1000l);
2118 }
2119
2120
2121 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2122                                          int *valp,
2123                                          int write, void *data)
2124 {
2125         if (write) {
2126                 if (*lvalp > LONG_MAX / HZ)
2127                         return 1;
2128                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2129         } else {
2130                 int val = *valp;
2131                 unsigned long lval;
2132                 if (val < 0) {
2133                         *negp = -1;
2134                         lval = (unsigned long)-val;
2135                 } else {
2136                         *negp = 0;
2137                         lval = (unsigned long)val;
2138                 }
2139                 *lvalp = lval / HZ;
2140         }
2141         return 0;
2142 }
2143
2144 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2145                                                 int *valp,
2146                                                 int write, void *data)
2147 {
2148         if (write) {
2149                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2150                         return 1;
2151                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2152         } else {
2153                 int val = *valp;
2154                 unsigned long lval;
2155                 if (val < 0) {
2156                         *negp = -1;
2157                         lval = (unsigned long)-val;
2158                 } else {
2159                         *negp = 0;
2160                         lval = (unsigned long)val;
2161                 }
2162                 *lvalp = jiffies_to_clock_t(lval);
2163         }
2164         return 0;
2165 }
2166
2167 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2168                                             int *valp,
2169                                             int write, void *data)
2170 {
2171         if (write) {
2172                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2173         } else {
2174                 int val = *valp;
2175                 unsigned long lval;
2176                 if (val < 0) {
2177                         *negp = -1;
2178                         lval = (unsigned long)-val;
2179                 } else {
2180                         *negp = 0;
2181                         lval = (unsigned long)val;
2182                 }
2183                 *lvalp = jiffies_to_msecs(lval);
2184         }
2185         return 0;
2186 }
2187
2188 /**
2189  * proc_dointvec_jiffies - read a vector of integers as seconds
2190  * @table: the sysctl table
2191  * @write: %TRUE if this is a write to the sysctl file
2192  * @filp: the file structure
2193  * @buffer: the user buffer
2194  * @lenp: the size of the user buffer
2195  * @ppos: file position
2196  *
2197  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2198  * values from/to the user buffer, treated as an ASCII string.
2199  * The values read are assumed to be in seconds, and are converted into
2200  * jiffies.
2201  *
2202  * Returns 0 on success.
2203  */
2204 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2205                           void __user *buffer, size_t *lenp, loff_t *ppos)
2206 {
2207     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2208                             do_proc_dointvec_jiffies_conv,NULL);
2209 }
2210
2211 /**
2212  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2213  * @table: the sysctl table
2214  * @write: %TRUE if this is a write to the sysctl file
2215  * @filp: the file structure
2216  * @buffer: the user buffer
2217  * @lenp: the size of the user buffer
2218  * @ppos: pointer to the file position
2219  *
2220  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2221  * values from/to the user buffer, treated as an ASCII string.
2222  * The values read are assumed to be in 1/USER_HZ seconds, and
2223  * are converted into jiffies.
2224  *
2225  * Returns 0 on success.
2226  */
2227 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2228                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2229 {
2230     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2231                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2232 }
2233
2234 /**
2235  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2236  * @table: the sysctl table
2237  * @write: %TRUE if this is a write to the sysctl file
2238  * @filp: the file structure
2239  * @buffer: the user buffer
2240  * @lenp: the size of the user buffer
2241  * @ppos: file position
2242  * @ppos: the current position in the file
2243  *
2244  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2245  * values from/to the user buffer, treated as an ASCII string.
2246  * The values read are assumed to be in 1/1000 seconds, and
2247  * are converted into jiffies.
2248  *
2249  * Returns 0 on success.
2250  */
2251 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2252                              void __user *buffer, size_t *lenp, loff_t *ppos)
2253 {
2254         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2255                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2256 }
2257
2258 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2259                            void __user *buffer, size_t *lenp, loff_t *ppos)
2260 {
2261         struct pid *new_pid;
2262         pid_t tmp;
2263         int r;
2264
2265         tmp = pid_nr(cad_pid);
2266
2267         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2268                                lenp, ppos, NULL, NULL);
2269         if (r || !write)
2270                 return r;
2271
2272         new_pid = find_get_pid(tmp);
2273         if (!new_pid)
2274                 return -ESRCH;
2275
2276         put_pid(xchg(&cad_pid, new_pid));
2277         return 0;
2278 }
2279
2280 #else /* CONFIG_PROC_FS */
2281
2282 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2283                   void __user *buffer, size_t *lenp, loff_t *ppos)
2284 {
2285         return -ENOSYS;
2286 }
2287
2288 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2289                   void __user *buffer, size_t *lenp, loff_t *ppos)
2290 {
2291         return -ENOSYS;
2292 }
2293
2294 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2295                         void __user *buffer, size_t *lenp, loff_t *ppos)
2296 {
2297         return -ENOSYS;
2298 }
2299
2300 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2301                     void __user *buffer, size_t *lenp, loff_t *ppos)
2302 {
2303         return -ENOSYS;
2304 }
2305
2306 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2307                     void __user *buffer, size_t *lenp, loff_t *ppos)
2308 {
2309         return -ENOSYS;
2310 }
2311
2312 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2313                     void __user *buffer, size_t *lenp, loff_t *ppos)
2314 {
2315         return -ENOSYS;
2316 }
2317
2318 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2319                              void __user *buffer, size_t *lenp, loff_t *ppos)
2320 {
2321         return -ENOSYS;
2322 }
2323
2324 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2325                     void __user *buffer, size_t *lenp, loff_t *ppos)
2326 {
2327         return -ENOSYS;
2328 }
2329
2330 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2331                                       struct file *filp,
2332                                       void __user *buffer,
2333                                       size_t *lenp, loff_t *ppos)
2334 {
2335     return -ENOSYS;
2336 }
2337
2338
2339 #endif /* CONFIG_PROC_FS */
2340
2341
2342 #ifdef CONFIG_SYSCTL_SYSCALL
2343 /*
2344  * General sysctl support routines
2345  */
2346
2347 /* The generic sysctl data routine (used if no strategy routine supplied) */
2348 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2349                 void __user *oldval, size_t __user *oldlenp,
2350                 void __user *newval, size_t newlen)
2351 {
2352         size_t len;
2353
2354         /* Get out of I don't have a variable */
2355         if (!table->data || !table->maxlen)
2356                 return -ENOTDIR;
2357
2358         if (oldval && oldlenp) {
2359                 if (get_user(len, oldlenp))
2360                         return -EFAULT;
2361                 if (len) {
2362                         if (len > table->maxlen)
2363                                 len = table->maxlen;
2364                         if (copy_to_user(oldval, table->data, len))
2365                                 return -EFAULT;
2366                         if (put_user(len, oldlenp))
2367                                 return -EFAULT;
2368                 }
2369         }
2370
2371         if (newval && newlen) {
2372                 if (newlen > table->maxlen)
2373                         newlen = table->maxlen;
2374
2375                 if (copy_from_user(table->data, newval, newlen))
2376                         return -EFAULT;
2377         }
2378         return 1;
2379 }
2380
2381 /* The generic string strategy routine: */
2382 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2383                   void __user *oldval, size_t __user *oldlenp,
2384                   void __user *newval, size_t newlen)
2385 {
2386         if (!table->data || !table->maxlen)
2387                 return -ENOTDIR;
2388
2389         if (oldval && oldlenp) {
2390                 size_t bufsize;
2391                 if (get_user(bufsize, oldlenp))
2392                         return -EFAULT;
2393                 if (bufsize) {
2394                         size_t len = strlen(table->data), copied;
2395
2396                         /* This shouldn't trigger for a well-formed sysctl */
2397                         if (len > table->maxlen)
2398                                 len = table->maxlen;
2399
2400                         /* Copy up to a max of bufsize-1 bytes of the string */
2401                         copied = (len >= bufsize) ? bufsize - 1 : len;
2402
2403                         if (copy_to_user(oldval, table->data, copied) ||
2404                             put_user(0, (char __user *)(oldval + copied)))
2405                                 return -EFAULT;
2406                         if (put_user(len, oldlenp))
2407                                 return -EFAULT;
2408                 }
2409         }
2410         if (newval && newlen) {
2411                 size_t len = newlen;
2412                 if (len > table->maxlen)
2413                         len = table->maxlen;
2414                 if(copy_from_user(table->data, newval, len))
2415                         return -EFAULT;
2416                 if (len == table->maxlen)
2417                         len--;
2418                 ((char *) table->data)[len] = 0;
2419         }
2420         return 1;
2421 }
2422
2423 /*
2424  * This function makes sure that all of the integers in the vector
2425  * are between the minimum and maximum values given in the arrays
2426  * table->extra1 and table->extra2, respectively.
2427  */
2428 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2429                 void __user *oldval, size_t __user *oldlenp,
2430                 void __user *newval, size_t newlen)
2431 {
2432
2433         if (newval && newlen) {
2434                 int __user *vec = (int __user *) newval;
2435                 int *min = (int *) table->extra1;
2436                 int *max = (int *) table->extra2;
2437                 size_t length;
2438                 int i;
2439
2440                 if (newlen % sizeof(int) != 0)
2441                         return -EINVAL;
2442
2443                 if (!table->extra1 && !table->extra2)
2444                         return 0;
2445
2446                 if (newlen > table->maxlen)
2447                         newlen = table->maxlen;
2448                 length = newlen / sizeof(int);
2449
2450                 for (i = 0; i < length; i++) {
2451                         int value;
2452                         if (get_user(value, vec + i))
2453                                 return -EFAULT;
2454                         if (min && value < min[i])
2455                                 return -EINVAL;
2456                         if (max && value > max[i])
2457                                 return -EINVAL;
2458                 }
2459         }
2460         return 0;
2461 }
2462
2463 /* Strategy function to convert jiffies to seconds */
2464 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2465                 void __user *oldval, size_t __user *oldlenp,
2466                 void __user *newval, size_t newlen)
2467 {
2468         if (oldval && oldlenp) {
2469                 size_t olen;
2470
2471                 if (get_user(olen, oldlenp))
2472                         return -EFAULT;
2473                 if (olen) {
2474                         int val;
2475
2476                         if (olen < sizeof(int))
2477                                 return -EINVAL;
2478
2479                         val = *(int *)(table->data) / HZ;
2480                         if (put_user(val, (int __user *)oldval))
2481                                 return -EFAULT;
2482                         if (put_user(sizeof(int), oldlenp))
2483                                 return -EFAULT;
2484                 }
2485         }
2486         if (newval && newlen) {
2487                 int new;
2488                 if (newlen != sizeof(int))
2489                         return -EINVAL;
2490                 if (get_user(new, (int __user *)newval))
2491                         return -EFAULT;
2492                 *(int *)(table->data) = new*HZ;
2493         }
2494         return 1;
2495 }
2496
2497 /* Strategy function to convert jiffies to seconds */
2498 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2499                 void __user *oldval, size_t __user *oldlenp,
2500                 void __user *newval, size_t newlen)
2501 {
2502         if (oldval && oldlenp) {
2503                 size_t olen;
2504
2505                 if (get_user(olen, oldlenp))
2506                         return -EFAULT;
2507                 if (olen) {
2508                         int val;
2509
2510                         if (olen < sizeof(int))
2511                                 return -EINVAL;
2512
2513                         val = jiffies_to_msecs(*(int *)(table->data));
2514                         if (put_user(val, (int __user *)oldval))
2515                                 return -EFAULT;
2516                         if (put_user(sizeof(int), oldlenp))
2517                                 return -EFAULT;
2518                 }
2519         }
2520         if (newval && newlen) {
2521                 int new;
2522                 if (newlen != sizeof(int))
2523                         return -EINVAL;
2524                 if (get_user(new, (int __user *)newval))
2525                         return -EFAULT;
2526                 *(int *)(table->data) = msecs_to_jiffies(new);
2527         }
2528         return 1;
2529 }
2530
2531
2532
2533 #else /* CONFIG_SYSCTL_SYSCALL */
2534
2535
2536 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2537 {
2538         static int msg_count;
2539         struct __sysctl_args tmp;
2540         int name[CTL_MAXNAME];
2541         int i;
2542
2543         /* Read in the sysctl name for better debug message logging */
2544         if (copy_from_user(&tmp, args, sizeof(tmp)))
2545                 return -EFAULT;
2546         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2547                 return -ENOTDIR;
2548         for (i = 0; i < tmp.nlen; i++)
2549                 if (get_user(name[i], tmp.name + i))
2550                         return -EFAULT;
2551
2552         /* Ignore accesses to kernel.version */
2553         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2554                 goto out;
2555
2556         if (msg_count < 5) {
2557                 msg_count++;
2558                 printk(KERN_INFO
2559                         "warning: process `%s' used the removed sysctl "
2560                         "system call with ", current->comm);
2561                 for (i = 0; i < tmp.nlen; i++)
2562                         printk("%d.", name[i]);
2563                 printk("\n");
2564         }
2565 out:
2566         return -ENOSYS;
2567 }
2568
2569 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2570                   void __user *oldval, size_t __user *oldlenp,
2571                   void __user *newval, size_t newlen)
2572 {
2573         return -ENOSYS;
2574 }
2575
2576 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2577                   void __user *oldval, size_t __user *oldlenp,
2578                   void __user *newval, size_t newlen)
2579 {
2580         return -ENOSYS;
2581 }
2582
2583 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2584                 void __user *oldval, size_t __user *oldlenp,
2585                 void __user *newval, size_t newlen)
2586 {
2587         return -ENOSYS;
2588 }
2589
2590 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2591                 void __user *oldval, size_t __user *oldlenp,
2592                 void __user *newval, size_t newlen)
2593 {
2594         return -ENOSYS;
2595 }
2596
2597 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2598                 void __user *oldval, size_t __user *oldlenp,
2599                 void __user *newval, size_t newlen)
2600 {
2601         return -ENOSYS;
2602 }
2603
2604 #endif /* CONFIG_SYSCTL_SYSCALL */
2605
2606 /*
2607  * No sense putting this after each symbol definition, twice,
2608  * exception granted :-)
2609  */
2610 EXPORT_SYMBOL(proc_dointvec);
2611 EXPORT_SYMBOL(proc_dointvec_jiffies);
2612 EXPORT_SYMBOL(proc_dointvec_minmax);
2613 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2614 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2615 EXPORT_SYMBOL(proc_dostring);
2616 EXPORT_SYMBOL(proc_doulongvec_minmax);
2617 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2618 EXPORT_SYMBOL(register_sysctl_table);
2619 EXPORT_SYMBOL(sysctl_intvec);
2620 EXPORT_SYMBOL(sysctl_jiffies);
2621 EXPORT_SYMBOL(sysctl_ms_jiffies);
2622 EXPORT_SYMBOL(sysctl_string);
2623 EXPORT_SYMBOL(sysctl_data);
2624 EXPORT_SYMBOL(unregister_sysctl_table);