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   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/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                 .procname       = "cad_pid",
 513                 .data           = NULL,
 514                 .maxlen         = sizeof (int),
 515                 .mode           = 0600,
 516                 .proc_handler   = &proc_do_cad_pid,
 517         },
 518 #endif
 519         {
 520                 .ctl_name       = KERN_MAX_THREADS,
 521                 .procname       = "threads-max",
 522                 .data           = &max_threads,
 523                 .maxlen         = sizeof(int),
 524                 .mode           = 0644,
 525                 .proc_handler   = &proc_dointvec,
 526         },
 527         {
 528                 .ctl_name       = KERN_RANDOM,
 529                 .procname       = "random",
 530                 .mode           = 0555,
 531                 .child          = random_table,
 532         },
 533         {
 534                 .ctl_name       = KERN_OVERFLOWUID,
 535                 .procname       = "overflowuid",
 536                 .data           = &overflowuid,
 537                 .maxlen         = sizeof(int),
 538                 .mode           = 0644,
 539                 .proc_handler   = &proc_dointvec_minmax,
 540                 .strategy       = &sysctl_intvec,
 541                 .extra1         = &minolduid,
 542                 .extra2         = &maxolduid,
 543         },
 544         {
 545                 .ctl_name       = KERN_OVERFLOWGID,
 546                 .procname       = "overflowgid",
 547                 .data           = &overflowgid,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = &proc_dointvec_minmax,
 551                 .strategy       = &sysctl_intvec,
 552                 .extra1         = &minolduid,
 553                 .extra2         = &maxolduid,
 554         },
 555 #ifdef CONFIG_S390
 556 #ifdef CONFIG_MATHEMU
 557         {
 558                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 559                 .procname       = "ieee_emulation_warnings",
 560                 .data           = &sysctl_ieee_emulation_warnings,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec,
 564         },
 565 #endif
 566 #ifdef CONFIG_NO_IDLE_HZ
 567         {
 568                 .ctl_name       = KERN_HZ_TIMER,
 569                 .procname       = "hz_timer",
 570                 .data           = &sysctl_hz_timer,
 571                 .maxlen         = sizeof(int),
 572                 .mode           = 0644,
 573                 .proc_handler   = &proc_dointvec,
 574         },
 575 #endif
 576         {
 577                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 578                 .procname       = "userprocess_debug",
 579                 .data           = &sysctl_userprocess_debug,
 580                 .maxlen         = sizeof(int),
 581                 .mode           = 0644,
 582                 .proc_handler   = &proc_dointvec,
 583         },
 584 #endif
 585         {
 586                 .ctl_name       = KERN_PIDMAX,
 587                 .procname       = "pid_max",
 588                 .data           = &pid_max,
 589                 .maxlen         = sizeof (int),
 590                 .mode           = 0644,
 591                 .proc_handler   = &proc_dointvec_minmax,
 592                 .strategy       = sysctl_intvec,
 593                 .extra1         = &pid_max_min,
 594                 .extra2         = &pid_max_max,
 595         },
 596         {
 597                 .ctl_name       = KERN_PANIC_ON_OOPS,
 598                 .procname       = "panic_on_oops",
 599                 .data           = &panic_on_oops,
 600                 .maxlen         = sizeof(int),
 601                 .mode           = 0644,
 602                 .proc_handler   = &proc_dointvec,
 603         },
 604         {
 605                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 606                 .procname       = "printk_ratelimit",
 607                 .data           = &printk_ratelimit_jiffies,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec_jiffies,
 611                 .strategy       = &sysctl_jiffies,
 612         },
 613         {
 614                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 615                 .procname       = "printk_ratelimit_burst",
 616                 .data           = &printk_ratelimit_burst,
 617                 .maxlen         = sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec,
 620         },
 621         {
 622                 .ctl_name       = KERN_NGROUPS_MAX,
 623                 .procname       = "ngroups_max",
 624                 .data           = &ngroups_max,
 625                 .maxlen         = sizeof (int),
 626                 .mode           = 0444,
 627                 .proc_handler   = &proc_dointvec,
 628         },
 629 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 630         {
 631                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 632                 .procname       = "unknown_nmi_panic",
 633                 .data           = &unknown_nmi_panic,
 634                 .maxlen         = sizeof (int),
 635                 .mode           = 0644,
 636                 .proc_handler   = &proc_dointvec,
 637         },
 638         {
 639                 .procname       = "nmi_watchdog",
 640                 .data           = &nmi_watchdog_enabled,
 641                 .maxlen         = sizeof (int),
 642                 .mode           = 0644,
 643                 .proc_handler   = &proc_nmi_enabled,
 644         },
 645 #endif
 646 #if defined(CONFIG_X86)
 647         {
 648                 .ctl_name       = KERN_PANIC_ON_NMI,
 649                 .procname       = "panic_on_unrecovered_nmi",
 650                 .data           = &panic_on_unrecovered_nmi,
 651                 .maxlen         = sizeof(int),
 652                 .mode           = 0644,
 653                 .proc_handler   = &proc_dointvec,
 654         },
 655         {
 656                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 657                 .procname       = "bootloader_type",
 658                 .data           = &bootloader_type,
 659                 .maxlen         = sizeof (int),
 660                 .mode           = 0444,
 661                 .proc_handler   = &proc_dointvec,
 662         },
 663         {
 664                 .ctl_name       = CTL_UNNUMBERED,
 665                 .procname       = "kstack_depth_to_print",
 666                 .data           = &kstack_depth_to_print,
 667                 .maxlen         = sizeof(int),
 668                 .mode           = 0644,
 669                 .proc_handler   = &proc_dointvec,
 670         },
 671 #endif
 672 #if defined(CONFIG_MMU)
 673         {
 674                 .ctl_name       = KERN_RANDOMIZE,
 675                 .procname       = "randomize_va_space",
 676                 .data           = &randomize_va_space,
 677                 .maxlen         = sizeof(int),
 678                 .mode           = 0644,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681 #endif
 682 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 683         {
 684                 .ctl_name       = KERN_SPIN_RETRY,
 685                 .procname       = "spin_retry",
 686                 .data           = &spin_retry,
 687                 .maxlen         = sizeof (int),
 688                 .mode           = 0644,
 689                 .proc_handler   = &proc_dointvec,
 690         },
 691 #endif
 692 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 693         {
 694                 .procname       = "acpi_video_flags",
 695                 .data           = &acpi_realmode_flags,
 696                 .maxlen         = sizeof (unsigned long),
 697                 .mode           = 0644,
 698                 .proc_handler   = &proc_doulongvec_minmax,
 699         },
 700 #endif
 701 #ifdef CONFIG_IA64
 702         {
 703                 .ctl_name       = KERN_IA64_UNALIGNED,
 704                 .procname       = "ignore-unaligned-usertrap",
 705                 .data           = &no_unaligned_warning,
 706                 .maxlen         = sizeof (int),
 707                 .mode           = 0644,
 708                 .proc_handler   = &proc_dointvec,
 709         },
 710 #endif
 711 #ifdef CONFIG_DETECT_SOFTLOCKUP
 712         {
 713                 .ctl_name       = CTL_UNNUMBERED,
 714                 .procname       = "softlockup_thresh",
 715                 .data           = &softlockup_thresh,
 716                 .maxlen         = sizeof(int),
 717                 .mode           = 0644,
 718                 .proc_handler   = &proc_dointvec_minmax,
 719                 .strategy       = &sysctl_intvec,
 720                 .extra1         = &one,
 721                 .extra2         = &sixty,
 722         },
 723 #endif
 724 #ifdef CONFIG_COMPAT
 725         {
 726                 .ctl_name       = KERN_COMPAT_LOG,
 727                 .procname       = "compat-log",
 728                 .data           = &compat_log,
 729                 .maxlen         = sizeof (int),
 730                 .mode           = 0644,
 731                 .proc_handler   = &proc_dointvec,
 732         },
 733 #endif
 734 #ifdef CONFIG_RT_MUTEXES
 735         {
 736                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 737                 .procname       = "max_lock_depth",
 738                 .data           = &max_lock_depth,
 739                 .maxlen         = sizeof(int),
 740                 .mode           = 0644,
 741                 .proc_handler   = &proc_dointvec,
 742         },
 743 #endif
 744 #ifdef CONFIG_PROC_FS
 745         {
 746                 .ctl_name       = CTL_UNNUMBERED,
 747                 .procname       = "maps_protect",
 748                 .data           = &maps_protect,
 749                 .maxlen         = sizeof(int),
 750                 .mode           = 0644,
 751                 .proc_handler   = &proc_dointvec,
 752         },
 753 #endif
 754         {
 755                 .ctl_name       = CTL_UNNUMBERED,
 756                 .procname       = "poweroff_cmd",
 757                 .data           = &poweroff_cmd,
 758                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 759                 .mode           = 0644,
 760                 .proc_handler   = &proc_dostring,
 761                 .strategy       = &sysctl_string,
 762         },
 763 /*
 764  * NOTE: do not add new entries to this table unless you have read
 765  * Documentation/sysctl/ctl_unnumbered.txt
 766  */
 767         { .ctl_name = 0 }
 768 };
 769
 770 static struct ctl_table vm_table[] = {
 771         {
 772                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 773                 .procname       = "overcommit_memory",
 774                 .data           = &sysctl_overcommit_memory,
 775                 .maxlen         = sizeof(sysctl_overcommit_memory),
 776                 .mode           = 0644,
 777                 .proc_handler   = &proc_dointvec,
 778         },
 779         {
 780                 .ctl_name       = VM_PANIC_ON_OOM,
 781                 .procname       = "panic_on_oom",
 782                 .data           = &sysctl_panic_on_oom,
 783                 .maxlen         = sizeof(sysctl_panic_on_oom),
 784                 .mode           = 0644,
 785                 .proc_handler   = &proc_dointvec,
 786         },
 787         {
 788                 .ctl_name       = CTL_UNNUMBERED,
 789                 .procname       = "oom_kill_allocating_task",
 790                 .data           = &sysctl_oom_kill_allocating_task,
 791                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 792                 .mode           = 0644,
 793                 .proc_handler   = &proc_dointvec,
 794         },
 795         {
 796                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 797                 .procname       = "overcommit_ratio",
 798                 .data           = &sysctl_overcommit_ratio,
 799                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 800                 .mode           = 0644,
 801                 .proc_handler   = &proc_dointvec,
 802         },
 803         {
 804                 .ctl_name       = VM_PAGE_CLUSTER,
 805                 .procname       = "page-cluster",
 806                 .data           = &page_cluster,
 807                 .maxlen         = sizeof(int),
 808                 .mode           = 0644,
 809                 .proc_handler   = &proc_dointvec,
 810         },
 811         {
 812                 .ctl_name       = VM_DIRTY_BACKGROUND,
 813                 .procname       = "dirty_background_ratio",
 814                 .data           = &dirty_background_ratio,
 815                 .maxlen         = sizeof(dirty_background_ratio),
 816                 .mode           = 0644,
 817                 .proc_handler   = &proc_dointvec_minmax,
 818                 .strategy       = &sysctl_intvec,
 819                 .extra1         = &zero,
 820                 .extra2         = &one_hundred,
 821         },
 822         {
 823                 .ctl_name       = VM_DIRTY_RATIO,
 824                 .procname       = "dirty_ratio",
 825                 .data           = &vm_dirty_ratio,
 826                 .maxlen         = sizeof(vm_dirty_ratio),
 827                 .mode           = 0644,
 828                 .proc_handler   = &dirty_ratio_handler,
 829                 .strategy       = &sysctl_intvec,
 830                 .extra1         = &zero,
 831                 .extra2         = &one_hundred,
 832         },
 833         {
 834                 .procname       = "dirty_writeback_centisecs",
 835                 .data           = &dirty_writeback_interval,
 836                 .maxlen         = sizeof(dirty_writeback_interval),
 837                 .mode           = 0644,
 838                 .proc_handler   = &dirty_writeback_centisecs_handler,
 839         },
 840         {
 841                 .procname       = "dirty_expire_centisecs",
 842                 .data           = &dirty_expire_interval,
 843                 .maxlen         = sizeof(dirty_expire_interval),
 844                 .mode           = 0644,
 845                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 846         },
 847         {
 848                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 849                 .procname       = "nr_pdflush_threads",
 850                 .data           = &nr_pdflush_threads,
 851                 .maxlen         = sizeof nr_pdflush_threads,
 852                 .mode           = 0444 /* read-only*/,
 853                 .proc_handler   = &proc_dointvec,
 854         },
 855         {
 856                 .ctl_name       = VM_SWAPPINESS,
 857                 .procname       = "swappiness",
 858                 .data           = &vm_swappiness,
 859                 .maxlen         = sizeof(vm_swappiness),
 860                 .mode           = 0644,
 861                 .proc_handler   = &proc_dointvec_minmax,
 862                 .strategy       = &sysctl_intvec,
 863                 .extra1         = &zero,
 864                 .extra2         = &one_hundred,
 865         },
 866 #ifdef CONFIG_HUGETLB_PAGE
 867          {
 868                 .procname       = "nr_hugepages",
 869                 .data           = &max_huge_pages,
 870                 .maxlen         = sizeof(unsigned long),
 871                 .mode           = 0644,
 872                 .proc_handler   = &hugetlb_sysctl_handler,
 873                 .extra1         = (void *)&hugetlb_zero,
 874                 .extra2         = (void *)&hugetlb_infinity,
 875          },
 876          {
 877                 .ctl_name       = VM_HUGETLB_GROUP,
 878                 .procname       = "hugetlb_shm_group",
 879                 .data           = &sysctl_hugetlb_shm_group,
 880                 .maxlen         = sizeof(gid_t),
 881                 .mode           = 0644,
 882                 .proc_handler   = &proc_dointvec,
 883          },
 884          {
 885                 .ctl_name       = CTL_UNNUMBERED,
 886                 .procname       = "hugepages_treat_as_movable",
 887                 .data           = &hugepages_treat_as_movable,
 888                 .maxlen         = sizeof(int),
 889                 .mode           = 0644,
 890                 .proc_handler   = &hugetlb_treat_movable_handler,
 891         },
 892         {
 893                 .ctl_name       = CTL_UNNUMBERED,
 894                 .procname       = "hugetlb_dynamic_pool",
 895                 .data           = &hugetlb_dynamic_pool,
 896                 .maxlen         = sizeof(hugetlb_dynamic_pool),
 897                 .mode           = 0644,
 898                 .proc_handler   = &proc_dointvec,
 899         },
 900 #endif
 901         {
 902                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 903                 .procname       = "lowmem_reserve_ratio",
 904                 .data           = &sysctl_lowmem_reserve_ratio,
 905                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 906                 .mode           = 0644,
 907                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 908                 .strategy       = &sysctl_intvec,
 909         },
 910         {
 911                 .ctl_name       = VM_DROP_PAGECACHE,
 912                 .procname       = "drop_caches",
 913                 .data           = &sysctl_drop_caches,
 914                 .maxlen         = sizeof(int),
 915                 .mode           = 0644,
 916                 .proc_handler   = drop_caches_sysctl_handler,
 917                 .strategy       = &sysctl_intvec,
 918         },
 919         {
 920                 .ctl_name       = VM_MIN_FREE_KBYTES,
 921                 .procname       = "min_free_kbytes",
 922                 .data           = &min_free_kbytes,
 923                 .maxlen         = sizeof(min_free_kbytes),
 924                 .mode           = 0644,
 925                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 926                 .strategy       = &sysctl_intvec,
 927                 .extra1         = &zero,
 928         },
 929         {
 930                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 931                 .procname       = "percpu_pagelist_fraction",
 932                 .data           = &percpu_pagelist_fraction,
 933                 .maxlen         = sizeof(percpu_pagelist_fraction),
 934                 .mode           = 0644,
 935                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 936                 .strategy       = &sysctl_intvec,
 937                 .extra1         = &min_percpu_pagelist_fract,
 938         },
 939 #ifdef CONFIG_MMU
 940         {
 941                 .ctl_name       = VM_MAX_MAP_COUNT,
 942                 .procname       = "max_map_count",
 943                 .data           = &sysctl_max_map_count,
 944                 .maxlen         = sizeof(sysctl_max_map_count),
 945                 .mode           = 0644,
 946                 .proc_handler   = &proc_dointvec
 947         },
 948 #endif
 949         {
 950                 .ctl_name       = VM_LAPTOP_MODE,
 951                 .procname       = "laptop_mode",
 952                 .data           = &laptop_mode,
 953                 .maxlen         = sizeof(laptop_mode),
 954                 .mode           = 0644,
 955                 .proc_handler   = &proc_dointvec_jiffies,
 956                 .strategy       = &sysctl_jiffies,
 957         },
 958         {
 959                 .ctl_name       = VM_BLOCK_DUMP,
 960                 .procname       = "block_dump",
 961                 .data           = &block_dump,
 962                 .maxlen         = sizeof(block_dump),
 963                 .mode           = 0644,
 964                 .proc_handler   = &proc_dointvec,
 965                 .strategy       = &sysctl_intvec,
 966                 .extra1         = &zero,
 967         },
 968         {
 969                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 970                 .procname       = "vfs_cache_pressure",
 971                 .data           = &sysctl_vfs_cache_pressure,
 972                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 973                 .mode           = 0644,
 974                 .proc_handler   = &proc_dointvec,
 975                 .strategy       = &sysctl_intvec,
 976                 .extra1         = &zero,
 977         },
 978 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 979         {
 980                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 981                 .procname       = "legacy_va_layout",
 982                 .data           = &sysctl_legacy_va_layout,
 983                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 984                 .mode           = 0644,
 985                 .proc_handler   = &proc_dointvec,
 986                 .strategy       = &sysctl_intvec,
 987                 .extra1         = &zero,
 988         },
 989 #endif
 990 #ifdef CONFIG_NUMA
 991         {
 992                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
 993                 .procname       = "zone_reclaim_mode",
 994                 .data           = &zone_reclaim_mode,
 995                 .maxlen         = sizeof(zone_reclaim_mode),
 996                 .mode           = 0644,
 997                 .proc_handler   = &proc_dointvec,
 998                 .strategy       = &sysctl_intvec,
 999                 .extra1         = &zero,
1000         },
1001         {
1002                 .ctl_name       = VM_MIN_UNMAPPED,
1003                 .procname       = "min_unmapped_ratio",
1004                 .data           = &sysctl_min_unmapped_ratio,
1005                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1006                 .mode           = 0644,
1007                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1008                 .strategy       = &sysctl_intvec,
1009                 .extra1         = &zero,
1010                 .extra2         = &one_hundred,
1011         },
1012         {
1013                 .ctl_name       = VM_MIN_SLAB,
1014                 .procname       = "min_slab_ratio",
1015                 .data           = &sysctl_min_slab_ratio,
1016                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1017                 .mode           = 0644,
1018                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1019                 .strategy       = &sysctl_intvec,
1020                 .extra1         = &zero,
1021                 .extra2         = &one_hundred,
1022         },
1023 #endif
1024 #ifdef CONFIG_SMP
1025         {
1026                 .ctl_name       = CTL_UNNUMBERED,
1027                 .procname       = "stat_interval",
1028                 .data           = &sysctl_stat_interval,
1029                 .maxlen         = sizeof(sysctl_stat_interval),
1030                 .mode           = 0644,
1031                 .proc_handler   = &proc_dointvec_jiffies,
1032                 .strategy       = &sysctl_jiffies,
1033         },
1034 #endif
1035 #ifdef CONFIG_SECURITY
1036         {
1037                 .ctl_name       = CTL_UNNUMBERED,
1038                 .procname       = "mmap_min_addr",
1039                 .data           = &mmap_min_addr,
1040                 .maxlen         = sizeof(unsigned long),
1041                 .mode           = 0644,
1042                 .proc_handler   = &proc_doulongvec_minmax,
1043         },
1044 #endif
1045 #ifdef CONFIG_NUMA
1046         {
1047                 .ctl_name       = CTL_UNNUMBERED,
1048                 .procname       = "numa_zonelist_order",
1049                 .data           = &numa_zonelist_order,
1050                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1051                 .mode           = 0644,
1052                 .proc_handler   = &numa_zonelist_order_handler,
1053                 .strategy       = &sysctl_string,
1054         },
1055 #endif
1056 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1057    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1058         {
1059                 .ctl_name       = VM_VDSO_ENABLED,
1060                 .procname       = "vdso_enabled",
1061                 .data           = &vdso_enabled,
1062                 .maxlen         = sizeof(vdso_enabled),
1063                 .mode           = 0644,
1064                 .proc_handler   = &proc_dointvec,
1065                 .strategy       = &sysctl_intvec,
1066                 .extra1         = &zero,
1067         },
1068 #endif
1069 /*
1070  * NOTE: do not add new entries to this table unless you have read
1071  * Documentation/sysctl/ctl_unnumbered.txt
1072  */
1073         { .ctl_name = 0 }
1074 };
1075
1076 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1077 static struct ctl_table binfmt_misc_table[] = {
1078         { .ctl_name = 0 }
1079 };
1080 #endif
1081
1082 static struct ctl_table fs_table[] = {
1083         {
1084                 .ctl_name       = FS_NRINODE,
1085                 .procname       = "inode-nr",
1086                 .data           = &inodes_stat,
1087                 .maxlen         = 2*sizeof(int),
1088                 .mode           = 0444,
1089                 .proc_handler   = &proc_dointvec,
1090         },
1091         {
1092                 .ctl_name       = FS_STATINODE,
1093                 .procname       = "inode-state",
1094                 .data           = &inodes_stat,
1095                 .maxlen         = 7*sizeof(int),
1096                 .mode           = 0444,
1097                 .proc_handler   = &proc_dointvec,
1098         },
1099         {
1100                 .procname       = "file-nr",
1101                 .data           = &files_stat,
1102                 .maxlen         = 3*sizeof(int),
1103                 .mode           = 0444,
1104                 .proc_handler   = &proc_nr_files,
1105         },
1106         {
1107                 .ctl_name       = FS_MAXFILE,
1108                 .procname       = "file-max",
1109                 .data           = &files_stat.max_files,
1110                 .maxlen         = sizeof(int),
1111                 .mode           = 0644,
1112                 .proc_handler   = &proc_dointvec,
1113         },
1114         {
1115                 .ctl_name       = FS_DENTRY,
1116                 .procname       = "dentry-state",
1117                 .data           = &dentry_stat,
1118                 .maxlen         = 6*sizeof(int),
1119                 .mode           = 0444,
1120                 .proc_handler   = &proc_dointvec,
1121         },
1122         {
1123                 .ctl_name       = FS_OVERFLOWUID,
1124                 .procname       = "overflowuid",
1125                 .data           = &fs_overflowuid,
1126                 .maxlen         = sizeof(int),
1127                 .mode           = 0644,
1128                 .proc_handler   = &proc_dointvec_minmax,
1129                 .strategy       = &sysctl_intvec,
1130                 .extra1         = &minolduid,
1131                 .extra2         = &maxolduid,
1132         },
1133         {
1134                 .ctl_name       = FS_OVERFLOWGID,
1135                 .procname       = "overflowgid",
1136                 .data           = &fs_overflowgid,
1137                 .maxlen         = sizeof(int),
1138                 .mode           = 0644,
1139                 .proc_handler   = &proc_dointvec_minmax,
1140                 .strategy       = &sysctl_intvec,
1141                 .extra1         = &minolduid,
1142                 .extra2         = &maxolduid,
1143         },
1144         {
1145                 .ctl_name       = FS_LEASES,
1146                 .procname       = "leases-enable",
1147                 .data           = &leases_enable,
1148                 .maxlen         = sizeof(int),
1149                 .mode           = 0644,
1150                 .proc_handler   = &proc_dointvec,
1151         },
1152 #ifdef CONFIG_DNOTIFY
1153         {
1154                 .ctl_name       = FS_DIR_NOTIFY,
1155                 .procname       = "dir-notify-enable",
1156                 .data           = &dir_notify_enable,
1157                 .maxlen         = sizeof(int),
1158                 .mode           = 0644,
1159                 .proc_handler   = &proc_dointvec,
1160         },
1161 #endif
1162 #ifdef CONFIG_MMU
1163         {
1164                 .ctl_name       = FS_LEASE_TIME,
1165                 .procname       = "lease-break-time",
1166                 .data           = &lease_break_time,
1167                 .maxlen         = sizeof(int),
1168                 .mode           = 0644,
1169                 .proc_handler   = &proc_dointvec_minmax,
1170                 .strategy       = &sysctl_intvec,
1171                 .extra1         = &zero,
1172                 .extra2         = &two,
1173         },
1174         {
1175                 .procname       = "aio-nr",
1176                 .data           = &aio_nr,
1177                 .maxlen         = sizeof(aio_nr),
1178                 .mode           = 0444,
1179                 .proc_handler   = &proc_doulongvec_minmax,
1180         },
1181         {
1182                 .procname       = "aio-max-nr",
1183                 .data           = &aio_max_nr,
1184                 .maxlen         = sizeof(aio_max_nr),
1185                 .mode           = 0644,
1186                 .proc_handler   = &proc_doulongvec_minmax,
1187         },
1188 #ifdef CONFIG_INOTIFY_USER
1189         {
1190                 .ctl_name       = FS_INOTIFY,
1191                 .procname       = "inotify",
1192                 .mode           = 0555,
1193                 .child          = inotify_table,
1194         },
1195 #endif
1196 #endif
1197         {
1198                 .ctl_name       = KERN_SETUID_DUMPABLE,
1199                 .procname       = "suid_dumpable",
1200                 .data           = &suid_dumpable,
1201                 .maxlen         = sizeof(int),
1202                 .mode           = 0644,
1203                 .proc_handler   = &proc_dointvec,
1204         },
1205 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1206         {
1207                 .ctl_name       = CTL_UNNUMBERED,
1208                 .procname       = "binfmt_misc",
1209                 .mode           = 0555,
1210                 .child          = binfmt_misc_table,
1211         },
1212 #endif
1213 /*
1214  * NOTE: do not add new entries to this table unless you have read
1215  * Documentation/sysctl/ctl_unnumbered.txt
1216  */
1217         { .ctl_name = 0 }
1218 };
1219
1220 static struct ctl_table debug_table[] = {
1221 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1222         {
1223                 .ctl_name       = CTL_UNNUMBERED,
1224                 .procname       = "exception-trace",
1225                 .data           = &show_unhandled_signals,
1226                 .maxlen         = sizeof(int),
1227                 .mode           = 0644,
1228                 .proc_handler   = proc_dointvec
1229         },
1230 #endif
1231         { .ctl_name = 0 }
1232 };
1233
1234 static struct ctl_table dev_table[] = {
1235         { .ctl_name = 0 }
1236 };
1237
1238 static DEFINE_SPINLOCK(sysctl_lock);
1239
1240 /* called under sysctl_lock */
1241 static int use_table(struct ctl_table_header *p)
1242 {
1243         if (unlikely(p->unregistering))
1244                 return 0;
1245         p->used++;
1246         return 1;
1247 }
1248
1249 /* called under sysctl_lock */
1250 static void unuse_table(struct ctl_table_header *p)
1251 {
1252         if (!--p->used)
1253                 if (unlikely(p->unregistering))
1254                         complete(p->unregistering);
1255 }
1256
1257 /* called under sysctl_lock, will reacquire if has to wait */
1258 static void start_unregistering(struct ctl_table_header *p)
1259 {
1260         /*
1261          * if p->used is 0, nobody will ever touch that entry again;
1262          * we'll eliminate all paths to it before dropping sysctl_lock
1263          */
1264         if (unlikely(p->used)) {
1265                 struct completion wait;
1266                 init_completion(&wait);
1267                 p->unregistering = &wait;
1268                 spin_unlock(&sysctl_lock);
1269                 wait_for_completion(&wait);
1270                 spin_lock(&sysctl_lock);
1271         }
1272         /*
1273          * do not remove from the list until nobody holds it; walking the
1274          * list in do_sysctl() relies on that.
1275          */
1276         list_del_init(&p->ctl_entry);
1277 }
1278
1279 void sysctl_head_finish(struct ctl_table_header *head)
1280 {
1281         if (!head)
1282                 return;
1283         spin_lock(&sysctl_lock);
1284         unuse_table(head);
1285         spin_unlock(&sysctl_lock);
1286 }
1287
1288 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1289 {
1290         struct ctl_table_header *head;
1291         struct list_head *tmp;
1292         spin_lock(&sysctl_lock);
1293         if (prev) {
1294                 tmp = &prev->ctl_entry;
1295                 unuse_table(prev);
1296                 goto next;
1297         }
1298         tmp = &root_table_header.ctl_entry;
1299         for (;;) {
1300                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1301
1302                 if (!use_table(head))
1303                         goto next;
1304                 spin_unlock(&sysctl_lock);
1305                 return head;
1306         next:
1307                 tmp = tmp->next;
1308                 if (tmp == &root_table_header.ctl_entry)
1309                         break;
1310         }
1311         spin_unlock(&sysctl_lock);
1312         return NULL;
1313 }
1314
1315 #ifdef CONFIG_SYSCTL_SYSCALL
1316 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1317                void __user *newval, size_t newlen)
1318 {
1319         struct ctl_table_header *head;
1320         int error = -ENOTDIR;
1321
1322         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1323                 return -ENOTDIR;
1324         if (oldval) {
1325                 int old_len;
1326                 if (!oldlenp || get_user(old_len, oldlenp))
1327                         return -EFAULT;
1328         }
1329
1330         for (head = sysctl_head_next(NULL); head;
1331                         head = sysctl_head_next(head)) {
1332                 error = parse_table(name, nlen, oldval, oldlenp,
1333                                         newval, newlen, head->ctl_table);
1334                 if (error != -ENOTDIR) {
1335                         sysctl_head_finish(head);
1336                         break;
1337                 }
1338         }
1339         return error;
1340 }
1341
1342 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1343 {
1344         struct __sysctl_args tmp;
1345         int error;
1346
1347         if (copy_from_user(&tmp, args, sizeof(tmp)))
1348                 return -EFAULT;
1349
1350         lock_kernel();
1351         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1352                           tmp.newval, tmp.newlen);
1353         unlock_kernel();
1354         return error;
1355 }
1356 #endif /* CONFIG_SYSCTL_SYSCALL */
1357
1358 /*
1359  * sysctl_perm does NOT grant the superuser all rights automatically, because
1360  * some sysctl variables are readonly even to root.
1361  */
1362
1363 static int test_perm(int mode, int op)
1364 {
1365         if (!current->euid)
1366                 mode >>= 6;
1367         else if (in_egroup_p(0))
1368                 mode >>= 3;
1369         if ((mode & op & 0007) == op)
1370                 return 0;
1371         return -EACCES;
1372 }
1373
1374 int sysctl_perm(struct ctl_table *table, int op)
1375 {
1376         int error;
1377         error = security_sysctl(table, op);
1378         if (error)
1379                 return error;
1380         return test_perm(table->mode, op);
1381 }
1382
1383 #ifdef CONFIG_SYSCTL_SYSCALL
1384 static int parse_table(int __user *name, int nlen,
1385                        void __user *oldval, size_t __user *oldlenp,
1386                        void __user *newval, size_t newlen,
1387                        struct ctl_table *table)
1388 {
1389         int n;
1390 repeat:
1391         if (!nlen)
1392                 return -ENOTDIR;
1393         if (get_user(n, name))
1394                 return -EFAULT;
1395         for ( ; table->ctl_name || table->procname; table++) {
1396                 if (!table->ctl_name)
1397                         continue;
1398                 if (n == table->ctl_name) {
1399                         int error;
1400                         if (table->child) {
1401                                 if (sysctl_perm(table, 001))
1402                                         return -EPERM;
1403                                 name++;
1404                                 nlen--;
1405                                 table = table->child;
1406                                 goto repeat;
1407                         }
1408                         error = do_sysctl_strategy(table, name, nlen,
1409                                                    oldval, oldlenp,
1410                                                    newval, newlen);
1411                         return error;
1412                 }
1413         }
1414         return -ENOTDIR;
1415 }
1416
1417 /* Perform the actual read/write of a sysctl table entry. */
1418 int do_sysctl_strategy (struct ctl_table *table,
1419                         int __user *name, int nlen,
1420                         void __user *oldval, size_t __user *oldlenp,
1421                         void __user *newval, size_t newlen)
1422 {
1423         int op = 0, rc;
1424
1425         if (oldval)
1426                 op |= 004;
1427         if (newval)
1428                 op |= 002;
1429         if (sysctl_perm(table, op))
1430                 return -EPERM;
1431
1432         if (table->strategy) {
1433                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1434                                      newval, newlen);
1435                 if (rc < 0)
1436                         return rc;
1437                 if (rc > 0)
1438                         return 0;
1439         }
1440
1441         /* If there is no strategy routine, or if the strategy returns
1442          * zero, proceed with automatic r/w */
1443         if (table->data && table->maxlen) {
1444                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1445                                  newval, newlen);
1446                 if (rc < 0)
1447                         return rc;
1448         }
1449         return 0;
1450 }
1451 #endif /* CONFIG_SYSCTL_SYSCALL */
1452
1453 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1454 {
1455         for (; table->ctl_name || table->procname; table++) {
1456                 table->parent = parent;
1457                 if (table->child)
1458                         sysctl_set_parent(table, table->child);
1459         }
1460 }
1461
1462 static __init int sysctl_init(void)
1463 {
1464         int err;
1465         sysctl_set_parent(NULL, root_table);
1466         err = sysctl_check_table(root_table);
1467         return 0;
1468 }
1469
1470 core_initcall(sysctl_init);
1471
1472 /**
1473  * register_sysctl_table - register a sysctl hierarchy
1474  * @table: the top-level table structure
1475  *
1476  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1477  * array. An entry with a ctl_name of 0 terminates the table.
1478  *
1479  * The members of the &struct ctl_table structure are used as follows:
1480  *
1481  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1482  *            must be unique within that level of sysctl
1483  *
1484  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1485  *            enter a sysctl file
1486  *
1487  * data - a pointer to data for use by proc_handler
1488  *
1489  * maxlen - the maximum size in bytes of the data
1490  *
1491  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1492  *
1493  * child - a pointer to the child sysctl table if this entry is a directory, or
1494  *         %NULL.
1495  *
1496  * proc_handler - the text handler routine (described below)
1497  *
1498  * strategy - the strategy routine (described below)
1499  *
1500  * de - for internal use by the sysctl routines
1501  *
1502  * extra1, extra2 - extra pointers usable by the proc handler routines
1503  *
1504  * Leaf nodes in the sysctl tree will be represented by a single file
1505  * under /proc; non-leaf nodes will be represented by directories.
1506  *
1507  * sysctl(2) can automatically manage read and write requests through
1508  * the sysctl table.  The data and maxlen fields of the ctl_table
1509  * struct enable minimal validation of the values being written to be
1510  * performed, and the mode field allows minimal authentication.
1511  *
1512  * More sophisticated management can be enabled by the provision of a
1513  * strategy routine with the table entry.  This will be called before
1514  * any automatic read or write of the data is performed.
1515  *
1516  * The strategy routine may return
1517  *
1518  * < 0 - Error occurred (error is passed to user process)
1519  *
1520  * 0   - OK - proceed with automatic read or write.
1521  *
1522  * > 0 - OK - read or write has been done by the strategy routine, so
1523  *       return immediately.
1524  *
1525  * There must be a proc_handler routine for any terminal nodes
1526  * mirrored under /proc/sys (non-terminals are handled by a built-in
1527  * directory handler).  Several default handlers are available to
1528  * cover common cases -
1529  *
1530  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1531  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1532  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1533  *
1534  * It is the handler's job to read the input buffer from user memory
1535  * and process it. The handler should return 0 on success.
1536  *
1537  * This routine returns %NULL on a failure to register, and a pointer
1538  * to the table header on success.
1539  */
1540 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1541 {
1542         struct ctl_table_header *tmp;
1543         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1544         if (!tmp)
1545                 return NULL;
1546         tmp->ctl_table = table;
1547         INIT_LIST_HEAD(&tmp->ctl_entry);
1548         tmp->used = 0;
1549         tmp->unregistering = NULL;
1550         sysctl_set_parent(NULL, table);
1551         if (sysctl_check_table(tmp->ctl_table)) {
1552                 kfree(tmp);
1553                 return NULL;
1554         }
1555         spin_lock(&sysctl_lock);
1556         list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1557         spin_unlock(&sysctl_lock);
1558         return tmp;
1559 }
1560
1561 /**
1562  * unregister_sysctl_table - unregister a sysctl table hierarchy
1563  * @header: the header returned from register_sysctl_table
1564  *
1565  * Unregisters the sysctl table and all children. proc entries may not
1566  * actually be removed until they are no longer used by anyone.
1567  */
1568 void unregister_sysctl_table(struct ctl_table_header * header)
1569 {
1570         might_sleep();
1571         spin_lock(&sysctl_lock);
1572         start_unregistering(header);
1573         spin_unlock(&sysctl_lock);
1574         kfree(header);
1575 }
1576
1577 #else /* !CONFIG_SYSCTL */
1578 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1579 {
1580         return NULL;
1581 }
1582
1583 void unregister_sysctl_table(struct ctl_table_header * table)
1584 {
1585 }
1586
1587 #endif /* CONFIG_SYSCTL */
1588
1589 /*
1590  * /proc/sys support
1591  */
1592
1593 #ifdef CONFIG_PROC_SYSCTL
1594
1595 static int _proc_do_string(void* data, int maxlen, int write,
1596                            struct file *filp, void __user *buffer,
1597                            size_t *lenp, loff_t *ppos)
1598 {
1599         size_t len;
1600         char __user *p;
1601         char c;
1602
1603         if (!data || !maxlen || !*lenp) {
1604                 *lenp = 0;
1605                 return 0;
1606         }
1607
1608         if (write) {
1609                 len = 0;
1610                 p = buffer;
1611                 while (len < *lenp) {
1612                         if (get_user(c, p++))
1613                                 return -EFAULT;
1614                         if (c == 0 || c == '\n')
1615                                 break;
1616                         len++;
1617                 }
1618                 if (len >= maxlen)
1619                         len = maxlen-1;
1620                 if(copy_from_user(data, buffer, len))
1621                         return -EFAULT;
1622                 ((char *) data)[len] = 0;
1623                 *ppos += *lenp;
1624         } else {
1625                 len = strlen(data);
1626                 if (len > maxlen)
1627                         len = maxlen;
1628
1629                 if (*ppos > len) {
1630                         *lenp = 0;
1631                         return 0;
1632                 }
1633
1634                 data += *ppos;
1635                 len  -= *ppos;
1636
1637                 if (len > *lenp)
1638                         len = *lenp;
1639                 if (len)
1640                         if(copy_to_user(buffer, data, len))
1641                                 return -EFAULT;
1642                 if (len < *lenp) {
1643                         if(put_user('\n', ((char __user *) buffer) + len))
1644                                 return -EFAULT;
1645                         len++;
1646                 }
1647                 *lenp = len;
1648                 *ppos += len;
1649         }
1650         return 0;
1651 }
1652
1653 /**
1654  * proc_dostring - read a string sysctl
1655  * @table: the sysctl table
1656  * @write: %TRUE if this is a write to the sysctl file
1657  * @filp: the file structure
1658  * @buffer: the user buffer
1659  * @lenp: the size of the user buffer
1660  * @ppos: file position
1661  *
1662  * Reads/writes a string from/to the user buffer. If the kernel
1663  * buffer provided is not large enough to hold the string, the
1664  * string is truncated. The copied string is %NULL-terminated.
1665  * If the string is being read by the user process, it is copied
1666  * and a newline '\n' is added. It is truncated if the buffer is
1667  * not large enough.
1668  *
1669  * Returns 0 on success.
1670  */
1671 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1672                   void __user *buffer, size_t *lenp, loff_t *ppos)
1673 {
1674         return _proc_do_string(table->data, table->maxlen, write, filp,
1675                                buffer, lenp, ppos);
1676 }
1677
1678
1679 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1680                                  int *valp,
1681                                  int write, void *data)
1682 {
1683         if (write) {
1684                 *valp = *negp ? -*lvalp : *lvalp;
1685         } else {
1686                 int val = *valp;
1687                 if (val < 0) {
1688                         *negp = -1;
1689                         *lvalp = (unsigned long)-val;
1690                 } else {
1691                         *negp = 0;
1692                         *lvalp = (unsigned long)val;
1693                 }
1694         }
1695         return 0;
1696 }
1697
1698 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1699                   int write, struct file *filp, void __user *buffer,
1700                   size_t *lenp, loff_t *ppos,
1701                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1702                               int write, void *data),
1703                   void *data)
1704 {
1705 #define TMPBUFLEN 21
1706         int *i, vleft, first=1, neg, val;
1707         unsigned long lval;
1708         size_t left, len;
1709
1710         char buf[TMPBUFLEN], *p;
1711         char __user *s = buffer;
1712
1713         if (!tbl_data || !table->maxlen || !*lenp ||
1714             (*ppos && !write)) {
1715                 *lenp = 0;
1716                 return 0;
1717         }
1718
1719         i = (int *) tbl_data;
1720         vleft = table->maxlen / sizeof(*i);
1721         left = *lenp;
1722
1723         if (!conv)
1724                 conv = do_proc_dointvec_conv;
1725
1726         for (; left && vleft--; i++, first=0) {
1727                 if (write) {
1728                         while (left) {
1729                                 char c;
1730                                 if (get_user(c, s))
1731                                         return -EFAULT;
1732                                 if (!isspace(c))
1733                                         break;
1734                                 left--;
1735                                 s++;
1736                         }
1737                         if (!left)
1738                                 break;
1739                         neg = 0;
1740                         len = left;
1741                         if (len > sizeof(buf) - 1)
1742                                 len = sizeof(buf) - 1;
1743                         if (copy_from_user(buf, s, len))
1744                                 return -EFAULT;
1745                         buf[len] = 0;
1746                         p = buf;
1747                         if (*p == '-' && left > 1) {
1748                                 neg = 1;
1749                                 p++;
1750                         }
1751                         if (*p < '0' || *p > '9')
1752                                 break;
1753
1754                         lval = simple_strtoul(p, &p, 0);
1755
1756                         len = p-buf;
1757                         if ((len < left) && *p && !isspace(*p))
1758                                 break;
1759                         if (neg)
1760                                 val = -val;
1761                         s += len;
1762                         left -= len;
1763
1764                         if (conv(&neg, &lval, i, 1, data))
1765                                 break;
1766                 } else {
1767                         p = buf;
1768                         if (!first)
1769                                 *p++ = '\t';
1770
1771                         if (conv(&neg, &lval, i, 0, data))
1772                                 break;
1773
1774                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1775                         len = strlen(buf);
1776                         if (len > left)
1777                                 len = left;
1778                         if(copy_to_user(s, buf, len))
1779                                 return -EFAULT;
1780                         left -= len;
1781                         s += len;
1782                 }
1783         }
1784
1785         if (!write && !first && left) {
1786                 if(put_user('\n', s))
1787                         return -EFAULT;
1788                 left--, s++;
1789         }
1790         if (write) {
1791                 while (left) {
1792                         char c;
1793                         if (get_user(c, s++))
1794                                 return -EFAULT;
1795                         if (!isspace(c))
1796                                 break;
1797                         left--;
1798                 }
1799         }
1800         if (write && first)
1801                 return -EINVAL;
1802         *lenp -= left;
1803         *ppos += *lenp;
1804         return 0;
1805 #undef TMPBUFLEN
1806 }
1807
1808 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1809                   void __user *buffer, size_t *lenp, loff_t *ppos,
1810                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1811                               int write, void *data),
1812                   void *data)
1813 {
1814         return __do_proc_dointvec(table->data, table, write, filp,
1815                         buffer, lenp, ppos, conv, data);
1816 }
1817
1818 /**
1819  * proc_dointvec - read a vector of integers
1820  * @table: the sysctl table
1821  * @write: %TRUE if this is a write to the sysctl file
1822  * @filp: the file structure
1823  * @buffer: the user buffer
1824  * @lenp: the size of the user buffer
1825  * @ppos: file position
1826  *
1827  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1828  * values from/to the user buffer, treated as an ASCII string.
1829  *
1830  * Returns 0 on success.
1831  */
1832 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1833                      void __user *buffer, size_t *lenp, loff_t *ppos)
1834 {
1835     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1836                             NULL,NULL);
1837 }
1838
1839 #define OP_SET  0
1840 #define OP_AND  1
1841 #define OP_OR   2
1842
1843 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1844                                       int *valp,
1845                                       int write, void *data)
1846 {
1847         int op = *(int *)data;
1848         if (write) {
1849                 int val = *negp ? -*lvalp : *lvalp;
1850                 switch(op) {
1851                 case OP_SET:    *valp = val; break;
1852                 case OP_AND:    *valp &= val; break;
1853                 case OP_OR:     *valp |= val; break;
1854                 }
1855         } else {
1856                 int val = *valp;
1857                 if (val < 0) {
1858                         *negp = -1;
1859                         *lvalp = (unsigned long)-val;
1860                 } else {
1861                         *negp = 0;
1862                         *lvalp = (unsigned long)val;
1863                 }
1864         }
1865         return 0;
1866 }
1867
1868 /*
1869  *      init may raise the set.
1870  */
1871
1872 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
1873                         void __user *buffer, size_t *lenp, loff_t *ppos)
1874 {
1875         int op;
1876
1877         if (write && !capable(CAP_SYS_MODULE)) {
1878                 return -EPERM;
1879         }
1880
1881         op = is_init(current) ? OP_SET : OP_AND;
1882         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1883                                 do_proc_dointvec_bset_conv,&op);
1884 }
1885
1886 /*
1887  *      Taint values can only be increased
1888  */
1889 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
1890                                void __user *buffer, size_t *lenp, loff_t *ppos)
1891 {
1892         int op;
1893
1894         if (write && !capable(CAP_SYS_ADMIN))
1895                 return -EPERM;
1896
1897         op = OP_OR;
1898         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1899                                 do_proc_dointvec_bset_conv,&op);
1900 }
1901
1902 struct do_proc_dointvec_minmax_conv_param {
1903         int *min;
1904         int *max;
1905 };
1906
1907 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1908                                         int *valp,
1909                                         int write, void *data)
1910 {
1911         struct do_proc_dointvec_minmax_conv_param *param = data;
1912         if (write) {
1913                 int val = *negp ? -*lvalp : *lvalp;
1914                 if ((param->min && *param->min > val) ||
1915                     (param->max && *param->max < val))
1916                         return -EINVAL;
1917                 *valp = val;
1918         } else {
1919                 int val = *valp;
1920                 if (val < 0) {
1921                         *negp = -1;
1922                         *lvalp = (unsigned long)-val;
1923                 } else {
1924                         *negp = 0;
1925                         *lvalp = (unsigned long)val;
1926                 }
1927         }
1928         return 0;
1929 }
1930
1931 /**
1932  * proc_dointvec_minmax - read a vector of integers with min/max values
1933  * @table: the sysctl table
1934  * @write: %TRUE if this is a write to the sysctl file
1935  * @filp: the file structure
1936  * @buffer: the user buffer
1937  * @lenp: the size of the user buffer
1938  * @ppos: file position
1939  *
1940  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1941  * values from/to the user buffer, treated as an ASCII string.
1942  *
1943  * This routine will ensure the values are within the range specified by
1944  * table->extra1 (min) and table->extra2 (max).
1945  *
1946  * Returns 0 on success.
1947  */
1948 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1949                   void __user *buffer, size_t *lenp, loff_t *ppos)
1950 {
1951         struct do_proc_dointvec_minmax_conv_param param = {
1952                 .min = (int *) table->extra1,
1953                 .max = (int *) table->extra2,
1954         };
1955         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1956                                 do_proc_dointvec_minmax_conv, &param);
1957 }
1958
1959 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1960                                      struct file *filp,
1961                                      void __user *buffer,
1962                                      size_t *lenp, loff_t *ppos,
1963                                      unsigned long convmul,
1964                                      unsigned long convdiv)
1965 {
1966 #define TMPBUFLEN 21
1967         unsigned long *i, *min, *max, val;
1968         int vleft, first=1, neg;
1969         size_t len, left;
1970         char buf[TMPBUFLEN], *p;
1971         char __user *s = buffer;
1972
1973         if (!data || !table->maxlen || !*lenp ||
1974             (*ppos && !write)) {
1975                 *lenp = 0;
1976                 return 0;
1977         }
1978
1979         i = (unsigned long *) data;
1980         min = (unsigned long *) table->extra1;
1981         max = (unsigned long *) table->extra2;
1982         vleft = table->maxlen / sizeof(unsigned long);
1983         left = *lenp;
1984
1985         for (; left && vleft--; i++, min++, max++, first=0) {
1986                 if (write) {
1987                         while (left) {
1988                                 char c;
1989                                 if (get_user(c, s))
1990                                         return -EFAULT;
1991                                 if (!isspace(c))
1992                                         break;
1993                                 left--;
1994                                 s++;
1995                         }
1996                         if (!left)
1997                                 break;
1998                         neg = 0;
1999                         len = left;
2000                         if (len > TMPBUFLEN-1)
2001                                 len = TMPBUFLEN-1;
2002                         if (copy_from_user(buf, s, len))
2003                                 return -EFAULT;
2004                         buf[len] = 0;
2005                         p = buf;
2006                         if (*p == '-' && left > 1) {
2007                                 neg = 1;
2008                                 p++;
2009                         }
2010                         if (*p < '0' || *p > '9')
2011                                 break;
2012                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2013                         len = p-buf;
2014                         if ((len < left) && *p && !isspace(*p))
2015                                 break;
2016                         if (neg)
2017                                 val = -val;
2018                         s += len;
2019                         left -= len;
2020
2021                         if(neg)
2022                                 continue;
2023                         if ((min && val < *min) || (max && val > *max))
2024                                 continue;
2025                         *i = val;
2026                 } else {
2027                         p = buf;
2028                         if (!first)
2029                                 *p++ = '\t';
2030                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2031                         len = strlen(buf);
2032                         if (len > left)
2033                                 len = left;
2034                         if(copy_to_user(s, buf, len))
2035                                 return -EFAULT;
2036                         left -= len;
2037                         s += len;
2038                 }
2039         }
2040
2041         if (!write && !first && left) {
2042                 if(put_user('\n', s))
2043                         return -EFAULT;
2044                 left--, s++;
2045         }
2046         if (write) {
2047                 while (left) {
2048                         char c;
2049                         if (get_user(c, s++))
2050                                 return -EFAULT;
2051                         if (!isspace(c))
2052                                 break;
2053                         left--;
2054                 }
2055         }
2056         if (write && first)
2057                 return -EINVAL;
2058         *lenp -= left;
2059         *ppos += *lenp;
2060         return 0;
2061 #undef TMPBUFLEN
2062 }
2063
2064 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2065                                      struct file *filp,
2066                                      void __user *buffer,
2067                                      size_t *lenp, loff_t *ppos,
2068                                      unsigned long convmul,
2069                                      unsigned long convdiv)
2070 {
2071         return __do_proc_doulongvec_minmax(table->data, table, write,
2072                         filp, buffer, lenp, ppos, convmul, convdiv);
2073 }
2074
2075 /**
2076  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2077  * @table: the sysctl table
2078  * @write: %TRUE if this is a write to the sysctl file
2079  * @filp: the file structure
2080  * @buffer: the user buffer
2081  * @lenp: the size of the user buffer
2082  * @ppos: file position
2083  *
2084  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2085  * values from/to the user buffer, treated as an ASCII string.
2086  *
2087  * This routine will ensure the values are within the range specified by
2088  * table->extra1 (min) and table->extra2 (max).
2089  *
2090  * Returns 0 on success.
2091  */
2092 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2093                            void __user *buffer, size_t *lenp, loff_t *ppos)
2094 {
2095     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2096 }
2097
2098 /**
2099  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2100  * @table: the sysctl table
2101  * @write: %TRUE if this is a write to the sysctl file
2102  * @filp: the file structure
2103  * @buffer: the user buffer
2104  * @lenp: the size of the user buffer
2105  * @ppos: file position
2106  *
2107  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2108  * values from/to the user buffer, treated as an ASCII string. The values
2109  * are treated as milliseconds, and converted to jiffies when they are stored.
2110  *
2111  * This routine will ensure the values are within the range specified by
2112  * table->extra1 (min) and table->extra2 (max).
2113  *
2114  * Returns 0 on success.
2115  */
2116 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2117                                       struct file *filp,
2118                                       void __user *buffer,
2119                                       size_t *lenp, loff_t *ppos)
2120 {
2121     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2122                                      lenp, ppos, HZ, 1000l);
2123 }
2124
2125
2126 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2127                                          int *valp,
2128                                          int write, void *data)
2129 {
2130         if (write) {
2131                 if (*lvalp > LONG_MAX / HZ)
2132                         return 1;
2133                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2134         } else {
2135                 int val = *valp;
2136                 unsigned long lval;
2137                 if (val < 0) {
2138                         *negp = -1;
2139                         lval = (unsigned long)-val;
2140                 } else {
2141                         *negp = 0;
2142                         lval = (unsigned long)val;
2143                 }
2144                 *lvalp = lval / HZ;
2145         }
2146         return 0;
2147 }
2148
2149 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2150                                                 int *valp,
2151                                                 int write, void *data)
2152 {
2153         if (write) {
2154                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2155                         return 1;
2156                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2157         } else {
2158                 int val = *valp;
2159                 unsigned long lval;
2160                 if (val < 0) {
2161                         *negp = -1;
2162                         lval = (unsigned long)-val;
2163                 } else {
2164                         *negp = 0;
2165                         lval = (unsigned long)val;
2166                 }
2167                 *lvalp = jiffies_to_clock_t(lval);
2168         }
2169         return 0;
2170 }
2171
2172 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2173                                             int *valp,
2174                                             int write, void *data)
2175 {
2176         if (write) {
2177                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2178         } else {
2179                 int val = *valp;
2180                 unsigned long lval;
2181                 if (val < 0) {
2182                         *negp = -1;
2183                         lval = (unsigned long)-val;
2184                 } else {
2185                         *negp = 0;
2186                         lval = (unsigned long)val;
2187                 }
2188                 *lvalp = jiffies_to_msecs(lval);
2189         }
2190         return 0;
2191 }
2192
2193 /**
2194  * proc_dointvec_jiffies - read a vector of integers as seconds
2195  * @table: the sysctl table
2196  * @write: %TRUE if this is a write to the sysctl file
2197  * @filp: the file structure
2198  * @buffer: the user buffer
2199  * @lenp: the size of the user buffer
2200  * @ppos: file position
2201  *
2202  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2203  * values from/to the user buffer, treated as an ASCII string.
2204  * The values read are assumed to be in seconds, and are converted into
2205  * jiffies.
2206  *
2207  * Returns 0 on success.
2208  */
2209 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2210                           void __user *buffer, size_t *lenp, loff_t *ppos)
2211 {
2212     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2213                             do_proc_dointvec_jiffies_conv,NULL);
2214 }
2215
2216 /**
2217  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2218  * @table: the sysctl table
2219  * @write: %TRUE if this is a write to the sysctl file
2220  * @filp: the file structure
2221  * @buffer: the user buffer
2222  * @lenp: the size of the user buffer
2223  * @ppos: pointer to the file position
2224  *
2225  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2226  * values from/to the user buffer, treated as an ASCII string.
2227  * The values read are assumed to be in 1/USER_HZ seconds, and
2228  * are converted into jiffies.
2229  *
2230  * Returns 0 on success.
2231  */
2232 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2233                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2234 {
2235     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2236                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2237 }
2238
2239 /**
2240  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2241  * @table: the sysctl table
2242  * @write: %TRUE if this is a write to the sysctl file
2243  * @filp: the file structure
2244  * @buffer: the user buffer
2245  * @lenp: the size of the user buffer
2246  * @ppos: file position
2247  * @ppos: the current position in the file
2248  *
2249  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2250  * values from/to the user buffer, treated as an ASCII string.
2251  * The values read are assumed to be in 1/1000 seconds, and
2252  * are converted into jiffies.
2253  *
2254  * Returns 0 on success.
2255  */
2256 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2257                              void __user *buffer, size_t *lenp, loff_t *ppos)
2258 {
2259         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2260                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2261 }
2262
2263 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2264                            void __user *buffer, size_t *lenp, loff_t *ppos)
2265 {
2266         struct pid *new_pid;
2267         pid_t tmp;
2268         int r;
2269
2270         tmp = pid_nr(cad_pid);
2271
2272         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2273                                lenp, ppos, NULL, NULL);
2274         if (r || !write)
2275                 return r;
2276
2277         new_pid = find_get_pid(tmp);
2278         if (!new_pid)
2279                 return -ESRCH;
2280
2281         put_pid(xchg(&cad_pid, new_pid));
2282         return 0;
2283 }
2284
2285 #else /* CONFIG_PROC_FS */
2286
2287 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2288                   void __user *buffer, size_t *lenp, loff_t *ppos)
2289 {
2290         return -ENOSYS;
2291 }
2292
2293 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2294                   void __user *buffer, size_t *lenp, loff_t *ppos)
2295 {
2296         return -ENOSYS;
2297 }
2298
2299 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2300                         void __user *buffer, size_t *lenp, loff_t *ppos)
2301 {
2302         return -ENOSYS;
2303 }
2304
2305 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2306                     void __user *buffer, size_t *lenp, loff_t *ppos)
2307 {
2308         return -ENOSYS;
2309 }
2310
2311 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2312                     void __user *buffer, size_t *lenp, loff_t *ppos)
2313 {
2314         return -ENOSYS;
2315 }
2316
2317 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2318                     void __user *buffer, size_t *lenp, loff_t *ppos)
2319 {
2320         return -ENOSYS;
2321 }
2322
2323 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2324                              void __user *buffer, size_t *lenp, loff_t *ppos)
2325 {
2326         return -ENOSYS;
2327 }
2328
2329 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2330                     void __user *buffer, size_t *lenp, loff_t *ppos)
2331 {
2332         return -ENOSYS;
2333 }
2334
2335 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2336                                       struct file *filp,
2337                                       void __user *buffer,
2338                                       size_t *lenp, loff_t *ppos)
2339 {
2340     return -ENOSYS;
2341 }
2342
2343
2344 #endif /* CONFIG_PROC_FS */
2345
2346
2347 #ifdef CONFIG_SYSCTL_SYSCALL
2348 /*
2349  * General sysctl support routines
2350  */
2351
2352 /* The generic sysctl data routine (used if no strategy routine supplied) */
2353 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2354                 void __user *oldval, size_t __user *oldlenp,
2355                 void __user *newval, size_t newlen)
2356 {
2357         size_t len;
2358
2359         /* Get out of I don't have a variable */
2360         if (!table->data || !table->maxlen)
2361                 return -ENOTDIR;
2362
2363         if (oldval && oldlenp) {
2364                 if (get_user(len, oldlenp))
2365                         return -EFAULT;
2366                 if (len) {
2367                         if (len > table->maxlen)
2368                                 len = table->maxlen;
2369                         if (copy_to_user(oldval, table->data, len))
2370                                 return -EFAULT;
2371                         if (put_user(len, oldlenp))
2372                                 return -EFAULT;
2373                 }
2374         }
2375
2376         if (newval && newlen) {
2377                 if (newlen > table->maxlen)
2378                         newlen = table->maxlen;
2379
2380                 if (copy_from_user(table->data, newval, newlen))
2381                         return -EFAULT;
2382         }
2383         return 1;
2384 }
2385
2386 /* The generic string strategy routine: */
2387 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2388                   void __user *oldval, size_t __user *oldlenp,
2389                   void __user *newval, size_t newlen)
2390 {
2391         if (!table->data || !table->maxlen)
2392                 return -ENOTDIR;
2393
2394         if (oldval && oldlenp) {
2395                 size_t bufsize;
2396                 if (get_user(bufsize, oldlenp))
2397                         return -EFAULT;
2398                 if (bufsize) {
2399                         size_t len = strlen(table->data), copied;
2400
2401                         /* This shouldn't trigger for a well-formed sysctl */
2402                         if (len > table->maxlen)
2403                                 len = table->maxlen;
2404
2405                         /* Copy up to a max of bufsize-1 bytes of the string */
2406                         copied = (len >= bufsize) ? bufsize - 1 : len;
2407
2408                         if (copy_to_user(oldval, table->data, copied) ||
2409                             put_user(0, (char __user *)(oldval + copied)))
2410                                 return -EFAULT;
2411                         if (put_user(len, oldlenp))
2412                                 return -EFAULT;
2413                 }
2414         }
2415         if (newval && newlen) {
2416                 size_t len = newlen;
2417                 if (len > table->maxlen)
2418                         len = table->maxlen;
2419                 if(copy_from_user(table->data, newval, len))
2420                         return -EFAULT;
2421                 if (len == table->maxlen)
2422                         len--;
2423                 ((char *) table->data)[len] = 0;
2424         }
2425         return 1;
2426 }
2427
2428 /*
2429  * This function makes sure that all of the integers in the vector
2430  * are between the minimum and maximum values given in the arrays
2431  * table->extra1 and table->extra2, respectively.
2432  */
2433 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2434                 void __user *oldval, size_t __user *oldlenp,
2435                 void __user *newval, size_t newlen)
2436 {
2437
2438         if (newval && newlen) {
2439                 int __user *vec = (int __user *) newval;
2440                 int *min = (int *) table->extra1;
2441                 int *max = (int *) table->extra2;
2442                 size_t length;
2443                 int i;
2444
2445                 if (newlen % sizeof(int) != 0)
2446                         return -EINVAL;
2447
2448                 if (!table->extra1 && !table->extra2)
2449                         return 0;
2450
2451                 if (newlen > table->maxlen)
2452                         newlen = table->maxlen;
2453                 length = newlen / sizeof(int);
2454
2455                 for (i = 0; i < length; i++) {
2456                         int value;
2457                         if (get_user(value, vec + i))
2458                                 return -EFAULT;
2459                         if (min && value < min[i])
2460                                 return -EINVAL;
2461                         if (max && value > max[i])
2462                                 return -EINVAL;
2463                 }
2464         }
2465         return 0;
2466 }
2467
2468 /* Strategy function to convert jiffies to seconds */
2469 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2470                 void __user *oldval, size_t __user *oldlenp,
2471                 void __user *newval, size_t newlen)
2472 {
2473         if (oldval && oldlenp) {
2474                 size_t olen;
2475
2476                 if (get_user(olen, oldlenp))
2477                         return -EFAULT;
2478                 if (olen) {
2479                         int val;
2480
2481                         if (olen < sizeof(int))
2482                                 return -EINVAL;
2483
2484                         val = *(int *)(table->data) / HZ;
2485                         if (put_user(val, (int __user *)oldval))
2486                                 return -EFAULT;
2487                         if (put_user(sizeof(int), oldlenp))
2488                                 return -EFAULT;
2489                 }
2490         }
2491         if (newval && newlen) {
2492                 int new;
2493                 if (newlen != sizeof(int))
2494                         return -EINVAL;
2495                 if (get_user(new, (int __user *)newval))
2496                         return -EFAULT;
2497                 *(int *)(table->data) = new*HZ;
2498         }
2499         return 1;
2500 }
2501
2502 /* Strategy function to convert jiffies to seconds */
2503 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2504                 void __user *oldval, size_t __user *oldlenp,
2505                 void __user *newval, size_t newlen)
2506 {
2507         if (oldval && oldlenp) {
2508                 size_t olen;
2509
2510                 if (get_user(olen, oldlenp))
2511                         return -EFAULT;
2512                 if (olen) {
2513                         int val;
2514
2515                         if (olen < sizeof(int))
2516                                 return -EINVAL;
2517
2518                         val = jiffies_to_msecs(*(int *)(table->data));
2519                         if (put_user(val, (int __user *)oldval))
2520                                 return -EFAULT;
2521                         if (put_user(sizeof(int), oldlenp))
2522                                 return -EFAULT;
2523                 }
2524         }
2525         if (newval && newlen) {
2526                 int new;
2527                 if (newlen != sizeof(int))
2528                         return -EINVAL;
2529                 if (get_user(new, (int __user *)newval))
2530                         return -EFAULT;
2531                 *(int *)(table->data) = msecs_to_jiffies(new);
2532         }
2533         return 1;
2534 }
2535
2536
2537
2538 #else /* CONFIG_SYSCTL_SYSCALL */
2539
2540
2541 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2542 {
2543         static int msg_count;
2544         struct __sysctl_args tmp;
2545         int name[CTL_MAXNAME];
2546         int i;
2547
2548         /* Read in the sysctl name for better debug message logging */
2549         if (copy_from_user(&tmp, args, sizeof(tmp)))
2550                 return -EFAULT;
2551         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2552                 return -ENOTDIR;
2553         for (i = 0; i < tmp.nlen; i++)
2554                 if (get_user(name[i], tmp.name + i))
2555                         return -EFAULT;
2556
2557         /* Ignore accesses to kernel.version */
2558         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2559                 goto out;
2560
2561         if (msg_count < 5) {
2562                 msg_count++;
2563                 printk(KERN_INFO
2564                         "warning: process `%s' used the removed sysctl "
2565                         "system call with ", current->comm);
2566                 for (i = 0; i < tmp.nlen; i++)
2567                         printk("%d.", name[i]);
2568                 printk("\n");
2569         }
2570 out:
2571         return -ENOSYS;
2572 }
2573
2574 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2575                   void __user *oldval, size_t __user *oldlenp,
2576                   void __user *newval, size_t newlen)
2577 {
2578         return -ENOSYS;
2579 }
2580
2581 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2582                   void __user *oldval, size_t __user *oldlenp,
2583                   void __user *newval, size_t newlen)
2584 {
2585         return -ENOSYS;
2586 }
2587
2588 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2589                 void __user *oldval, size_t __user *oldlenp,
2590                 void __user *newval, size_t newlen)
2591 {
2592         return -ENOSYS;
2593 }
2594
2595 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2596                 void __user *oldval, size_t __user *oldlenp,
2597                 void __user *newval, size_t newlen)
2598 {
2599         return -ENOSYS;
2600 }
2601
2602 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2603                 void __user *oldval, size_t __user *oldlenp,
2604                 void __user *newval, size_t newlen)
2605 {
2606         return -ENOSYS;
2607 }
2608
2609 #endif /* CONFIG_SYSCTL_SYSCALL */
2610
2611 /*
2612  * No sense putting this after each symbol definition, twice,
2613  * exception granted :-)
2614  */
2615 EXPORT_SYMBOL(proc_dointvec);
2616 EXPORT_SYMBOL(proc_dointvec_jiffies);
2617 EXPORT_SYMBOL(proc_dointvec_minmax);
2618 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2619 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2620 EXPORT_SYMBOL(proc_dostring);
2621 EXPORT_SYMBOL(proc_doulongvec_minmax);
2622 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2623 EXPORT_SYMBOL(register_sysctl_table);
2624 EXPORT_SYMBOL(sysctl_intvec);
2625 EXPORT_SYMBOL(sysctl_jiffies);
2626 EXPORT_SYMBOL(sysctl_ms_jiffies);
2627 EXPORT_SYMBOL(sysctl_string);
2628 EXPORT_SYMBOL(sysctl_data);
2629 EXPORT_SYMBOL(unregister_sysctl_table);