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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_UNIX98_PTYS
 167 extern struct ctl_table pty_table[];
 168 #endif
 169 #ifdef CONFIG_INOTIFY_USER
 170 extern struct ctl_table inotify_table[];
 171 #endif
 172
 173 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 174 int sysctl_legacy_va_layout;
 175 #endif
 176
 177 extern int prove_locking;
 178 extern int lock_stat;
 179
 180 /* The default sysctl tables: */
 181
 182 static struct ctl_table root_table[] = {
 183         {
 184                 .ctl_name       = CTL_KERN,
 185                 .procname       = "kernel",
 186                 .mode           = 0555,
 187                 .child          = kern_table,
 188         },
 189         {
 190                 .ctl_name       = CTL_VM,
 191                 .procname       = "vm",
 192                 .mode           = 0555,
 193                 .child          = vm_table,
 194         },
 195 #ifdef CONFIG_NET
 196         {
 197                 .ctl_name       = CTL_NET,
 198                 .procname       = "net",
 199                 .mode           = 0555,
 200                 .child          = net_table,
 201         },
 202 #endif
 203         {
 204                 .ctl_name       = CTL_FS,
 205                 .procname       = "fs",
 206                 .mode           = 0555,
 207                 .child          = fs_table,
 208         },
 209         {
 210                 .ctl_name       = CTL_DEBUG,
 211                 .procname       = "debug",
 212                 .mode           = 0555,
 213                 .child          = debug_table,
 214         },
 215         {
 216                 .ctl_name       = CTL_DEV,
 217                 .procname       = "dev",
 218                 .mode           = 0555,
 219                 .child          = dev_table,
 220         },
 221 /*
 222  * NOTE: do not add new entries to this table unless you have read
 223  * Documentation/sysctl/ctl_unnumbered.txt
 224  */
 225         { .ctl_name = 0 }
 226 };
 227
 228 #ifdef CONFIG_SCHED_DEBUG
 229 static unsigned long min_sched_granularity_ns = 100000;         /* 100 usecs */
 230 static unsigned long max_sched_granularity_ns = 1000000000;     /* 1 second */
 231 static unsigned long min_wakeup_granularity_ns;                 /* 0 usecs */
 232 static unsigned long max_wakeup_granularity_ns = 1000000000;    /* 1 second */
 233 #endif
 234
 235 static struct ctl_table kern_table[] = {
 236 #ifdef CONFIG_SCHED_DEBUG
 237         {
 238                 .ctl_name       = CTL_UNNUMBERED,
 239                 .procname       = "sched_nr_latency",
 240                 .data           = &sysctl_sched_nr_latency,
 241                 .maxlen         = sizeof(unsigned int),
 242                 .mode           = 0644,
 243                 .proc_handler   = &proc_dointvec,
 244         },
 245         {
 246                 .ctl_name       = CTL_UNNUMBERED,
 247                 .procname       = "sched_latency_ns",
 248                 .data           = &sysctl_sched_latency,
 249                 .maxlen         = sizeof(unsigned int),
 250                 .mode           = 0644,
 251                 .proc_handler   = &proc_dointvec_minmax,
 252                 .strategy       = &sysctl_intvec,
 253                 .extra1         = &min_sched_granularity_ns,
 254                 .extra2         = &max_sched_granularity_ns,
 255         },
 256         {
 257                 .ctl_name       = CTL_UNNUMBERED,
 258                 .procname       = "sched_wakeup_granularity_ns",
 259                 .data           = &sysctl_sched_wakeup_granularity,
 260                 .maxlen         = sizeof(unsigned int),
 261                 .mode           = 0644,
 262                 .proc_handler   = &proc_dointvec_minmax,
 263                 .strategy       = &sysctl_intvec,
 264                 .extra1         = &min_wakeup_granularity_ns,
 265                 .extra2         = &max_wakeup_granularity_ns,
 266         },
 267         {
 268                 .ctl_name       = CTL_UNNUMBERED,
 269                 .procname       = "sched_batch_wakeup_granularity_ns",
 270                 .data           = &sysctl_sched_batch_wakeup_granularity,
 271                 .maxlen         = sizeof(unsigned int),
 272                 .mode           = 0644,
 273                 .proc_handler   = &proc_dointvec_minmax,
 274                 .strategy       = &sysctl_intvec,
 275                 .extra1         = &min_wakeup_granularity_ns,
 276                 .extra2         = &max_wakeup_granularity_ns,
 277         },
 278         {
 279                 .ctl_name       = CTL_UNNUMBERED,
 280                 .procname       = "sched_child_runs_first",
 281                 .data           = &sysctl_sched_child_runs_first,
 282                 .maxlen         = sizeof(unsigned int),
 283                 .mode           = 0644,
 284                 .proc_handler   = &proc_dointvec,
 285         },
 286         {
 287                 .ctl_name       = CTL_UNNUMBERED,
 288                 .procname       = "sched_features",
 289                 .data           = &sysctl_sched_features,
 290                 .maxlen         = sizeof(unsigned int),
 291                 .mode           = 0644,
 292                 .proc_handler   = &proc_dointvec,
 293         },
 294         {
 295                 .ctl_name       = CTL_UNNUMBERED,
 296                 .procname       = "sched_migration_cost",
 297                 .data           = &sysctl_sched_migration_cost,
 298                 .maxlen         = sizeof(unsigned int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec,
 301         },
 302 #endif
 303         {
 304                 .ctl_name       = CTL_UNNUMBERED,
 305                 .procname       = "sched_compat_yield",
 306                 .data           = &sysctl_sched_compat_yield,
 307                 .maxlen         = sizeof(unsigned int),
 308                 .mode           = 0644,
 309                 .proc_handler   = &proc_dointvec,
 310         },
 311 #ifdef CONFIG_PROVE_LOCKING
 312         {
 313                 .ctl_name       = CTL_UNNUMBERED,
 314                 .procname       = "prove_locking",
 315                 .data           = &prove_locking,
 316                 .maxlen         = sizeof(int),
 317                 .mode           = 0644,
 318                 .proc_handler   = &proc_dointvec,
 319         },
 320 #endif
 321 #ifdef CONFIG_LOCK_STAT
 322         {
 323                 .ctl_name       = CTL_UNNUMBERED,
 324                 .procname       = "lock_stat",
 325                 .data           = &lock_stat,
 326                 .maxlen         = sizeof(int),
 327                 .mode           = 0644,
 328                 .proc_handler   = &proc_dointvec,
 329         },
 330 #endif
 331         {
 332                 .ctl_name       = KERN_PANIC,
 333                 .procname       = "panic",
 334                 .data           = &panic_timeout,
 335                 .maxlen         = sizeof(int),
 336                 .mode           = 0644,
 337                 .proc_handler   = &proc_dointvec,
 338         },
 339         {
 340                 .ctl_name       = KERN_CORE_USES_PID,
 341                 .procname       = "core_uses_pid",
 342                 .data           = &core_uses_pid,
 343                 .maxlen         = sizeof(int),
 344                 .mode           = 0644,
 345                 .proc_handler   = &proc_dointvec,
 346         },
 347 #ifdef CONFIG_AUDITSYSCALL
 348         {
 349                 .ctl_name       = CTL_UNNUMBERED,
 350                 .procname       = "audit_argv_kb",
 351                 .data           = &audit_argv_kb,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = &proc_dointvec,
 355         },
 356 #endif
 357         {
 358                 .ctl_name       = KERN_CORE_PATTERN,
 359                 .procname       = "core_pattern",
 360                 .data           = core_pattern,
 361                 .maxlen         = CORENAME_MAX_SIZE,
 362                 .mode           = 0644,
 363                 .proc_handler   = &proc_dostring,
 364                 .strategy       = &sysctl_string,
 365         },
 366 #ifdef CONFIG_PROC_SYSCTL
 367         {
 368                 .procname       = "tainted",
 369                 .data           = &tainted,
 370                 .maxlen         = sizeof(int),
 371                 .mode           = 0644,
 372                 .proc_handler   = &proc_dointvec_taint,
 373         },
 374 #endif
 375         {
 376                 .procname       = "cap-bound",
 377                 .data           = &cap_bset,
 378                 .maxlen         = sizeof(kernel_cap_t),
 379                 .mode           = 0600,
 380                 .proc_handler   = &proc_dointvec_bset,
 381         },
 382 #ifdef CONFIG_BLK_DEV_INITRD
 383         {
 384                 .ctl_name       = KERN_REALROOTDEV,
 385                 .procname       = "real-root-dev",
 386                 .data           = &real_root_dev,
 387                 .maxlen         = sizeof(int),
 388                 .mode           = 0644,
 389                 .proc_handler   = &proc_dointvec,
 390         },
 391 #endif
 392         {
 393                 .ctl_name       = CTL_UNNUMBERED,
 394                 .procname       = "print-fatal-signals",
 395                 .data           = &print_fatal_signals,
 396                 .maxlen         = sizeof(int),
 397                 .mode           = 0644,
 398                 .proc_handler   = &proc_dointvec,
 399         },
 400 #ifdef __sparc__
 401         {
 402                 .ctl_name       = KERN_SPARC_REBOOT,
 403                 .procname       = "reboot-cmd",
 404                 .data           = reboot_command,
 405                 .maxlen         = 256,
 406                 .mode           = 0644,
 407                 .proc_handler   = &proc_dostring,
 408                 .strategy       = &sysctl_string,
 409         },
 410         {
 411                 .ctl_name       = KERN_SPARC_STOP_A,
 412                 .procname       = "stop-a",
 413                 .data           = &stop_a_enabled,
 414                 .maxlen         = sizeof (int),
 415                 .mode           = 0644,
 416                 .proc_handler   = &proc_dointvec,
 417         },
 418         {
 419                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 420                 .procname       = "scons-poweroff",
 421                 .data           = &scons_pwroff,
 422                 .maxlen         = sizeof (int),
 423                 .mode           = 0644,
 424                 .proc_handler   = &proc_dointvec,
 425         },
 426 #endif
 427 #ifdef __hppa__
 428         {
 429                 .ctl_name       = KERN_HPPA_PWRSW,
 430                 .procname       = "soft-power",
 431                 .data           = &pwrsw_enabled,
 432                 .maxlen         = sizeof (int),
 433                 .mode           = 0644,
 434                 .proc_handler   = &proc_dointvec,
 435         },
 436         {
 437                 .ctl_name       = KERN_HPPA_UNALIGNED,
 438                 .procname       = "unaligned-trap",
 439                 .data           = &unaligned_enabled,
 440                 .maxlen         = sizeof (int),
 441                 .mode           = 0644,
 442                 .proc_handler   = &proc_dointvec,
 443         },
 444 #endif
 445         {
 446                 .ctl_name       = KERN_CTLALTDEL,
 447                 .procname       = "ctrl-alt-del",
 448                 .data           = &C_A_D,
 449                 .maxlen         = sizeof(int),
 450                 .mode           = 0644,
 451                 .proc_handler   = &proc_dointvec,
 452         },
 453         {
 454                 .ctl_name       = KERN_PRINTK,
 455                 .procname       = "printk",
 456                 .data           = &console_loglevel,
 457                 .maxlen         = 4*sizeof(int),
 458                 .mode           = 0644,
 459                 .proc_handler   = &proc_dointvec,
 460         },
 461 #ifdef CONFIG_KMOD
 462         {
 463                 .ctl_name       = KERN_MODPROBE,
 464                 .procname       = "modprobe",
 465                 .data           = &modprobe_path,
 466                 .maxlen         = KMOD_PATH_LEN,
 467                 .mode           = 0644,
 468                 .proc_handler   = &proc_dostring,
 469                 .strategy       = &sysctl_string,
 470         },
 471 #endif
 472 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 473         {
 474                 .ctl_name       = KERN_HOTPLUG,
 475                 .procname       = "hotplug",
 476                 .data           = &uevent_helper,
 477                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 478                 .mode           = 0644,
 479                 .proc_handler   = &proc_dostring,
 480                 .strategy       = &sysctl_string,
 481         },
 482 #endif
 483 #ifdef CONFIG_CHR_DEV_SG
 484         {
 485                 .ctl_name       = KERN_SG_BIG_BUFF,
 486                 .procname       = "sg-big-buff",
 487                 .data           = &sg_big_buff,
 488                 .maxlen         = sizeof (int),
 489                 .mode           = 0444,
 490                 .proc_handler   = &proc_dointvec,
 491         },
 492 #endif
 493 #ifdef CONFIG_BSD_PROCESS_ACCT
 494         {
 495                 .ctl_name       = KERN_ACCT,
 496                 .procname       = "acct",
 497                 .data           = &acct_parm,
 498                 .maxlen         = 3*sizeof(int),
 499                 .mode           = 0644,
 500                 .proc_handler   = &proc_dointvec,
 501         },
 502 #endif
 503 #ifdef CONFIG_MAGIC_SYSRQ
 504         {
 505                 .ctl_name       = KERN_SYSRQ,
 506                 .procname       = "sysrq",
 507                 .data           = &__sysrq_enabled,
 508                 .maxlen         = sizeof (int),
 509                 .mode           = 0644,
 510                 .proc_handler   = &proc_dointvec,
 511         },
 512 #endif
 513 #ifdef CONFIG_PROC_SYSCTL
 514         {
 515                 .ctl_name       = KERN_CADPID,
 516                 .procname       = "cad_pid",
 517                 .data           = NULL,
 518                 .maxlen         = sizeof (int),
 519                 .mode           = 0600,
 520                 .proc_handler   = &proc_do_cad_pid,
 521         },
 522 #endif
 523         {
 524                 .ctl_name       = KERN_MAX_THREADS,
 525                 .procname       = "threads-max",
 526                 .data           = &max_threads,
 527                 .maxlen         = sizeof(int),
 528                 .mode           = 0644,
 529                 .proc_handler   = &proc_dointvec,
 530         },
 531         {
 532                 .ctl_name       = KERN_RANDOM,
 533                 .procname       = "random",
 534                 .mode           = 0555,
 535                 .child          = random_table,
 536         },
 537 #ifdef CONFIG_UNIX98_PTYS
 538         {
 539                 .ctl_name       = KERN_PTY,
 540                 .procname       = "pty",
 541                 .mode           = 0555,
 542                 .child          = pty_table,
 543         },
 544 #endif
 545         {
 546                 .ctl_name       = KERN_OVERFLOWUID,
 547                 .procname       = "overflowuid",
 548                 .data           = &overflowuid,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = &proc_dointvec_minmax,
 552                 .strategy       = &sysctl_intvec,
 553                 .extra1         = &minolduid,
 554                 .extra2         = &maxolduid,
 555         },
 556         {
 557                 .ctl_name       = KERN_OVERFLOWGID,
 558                 .procname       = "overflowgid",
 559                 .data           = &overflowgid,
 560                 .maxlen         = sizeof(int),
 561                 .mode           = 0644,
 562                 .proc_handler   = &proc_dointvec_minmax,
 563                 .strategy       = &sysctl_intvec,
 564                 .extra1         = &minolduid,
 565                 .extra2         = &maxolduid,
 566         },
 567 #ifdef CONFIG_S390
 568 #ifdef CONFIG_MATHEMU
 569         {
 570                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 571                 .procname       = "ieee_emulation_warnings",
 572                 .data           = &sysctl_ieee_emulation_warnings,
 573                 .maxlen         = sizeof(int),
 574                 .mode           = 0644,
 575                 .proc_handler   = &proc_dointvec,
 576         },
 577 #endif
 578 #ifdef CONFIG_NO_IDLE_HZ
 579         {
 580                 .ctl_name       = KERN_HZ_TIMER,
 581                 .procname       = "hz_timer",
 582                 .data           = &sysctl_hz_timer,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec,
 586         },
 587 #endif
 588         {
 589                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 590                 .procname       = "userprocess_debug",
 591                 .data           = &sysctl_userprocess_debug,
 592                 .maxlen         = sizeof(int),
 593                 .mode           = 0644,
 594                 .proc_handler   = &proc_dointvec,
 595         },
 596 #endif
 597         {
 598                 .ctl_name       = KERN_PIDMAX,
 599                 .procname       = "pid_max",
 600                 .data           = &pid_max,
 601                 .maxlen         = sizeof (int),
 602                 .mode           = 0644,
 603                 .proc_handler   = &proc_dointvec_minmax,
 604                 .strategy       = sysctl_intvec,
 605                 .extra1         = &pid_max_min,
 606                 .extra2         = &pid_max_max,
 607         },
 608         {
 609                 .ctl_name       = KERN_PANIC_ON_OOPS,
 610                 .procname       = "panic_on_oops",
 611                 .data           = &panic_on_oops,
 612                 .maxlen         = sizeof(int),
 613                 .mode           = 0644,
 614                 .proc_handler   = &proc_dointvec,
 615         },
 616         {
 617                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 618                 .procname       = "printk_ratelimit",
 619                 .data           = &printk_ratelimit_jiffies,
 620                 .maxlen         = sizeof(int),
 621                 .mode           = 0644,
 622                 .proc_handler   = &proc_dointvec_jiffies,
 623                 .strategy       = &sysctl_jiffies,
 624         },
 625         {
 626                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 627                 .procname       = "printk_ratelimit_burst",
 628                 .data           = &printk_ratelimit_burst,
 629                 .maxlen         = sizeof(int),
 630                 .mode           = 0644,
 631                 .proc_handler   = &proc_dointvec,
 632         },
 633         {
 634                 .ctl_name       = KERN_NGROUPS_MAX,
 635                 .procname       = "ngroups_max",
 636                 .data           = &ngroups_max,
 637                 .maxlen         = sizeof (int),
 638                 .mode           = 0444,
 639                 .proc_handler   = &proc_dointvec,
 640         },
 641 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 642         {
 643                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 644                 .procname       = "unknown_nmi_panic",
 645                 .data           = &unknown_nmi_panic,
 646                 .maxlen         = sizeof (int),
 647                 .mode           = 0644,
 648                 .proc_handler   = &proc_dointvec,
 649         },
 650         {
 651                 .procname       = "nmi_watchdog",
 652                 .data           = &nmi_watchdog_enabled,
 653                 .maxlen         = sizeof (int),
 654                 .mode           = 0644,
 655                 .proc_handler   = &proc_nmi_enabled,
 656         },
 657 #endif
 658 #if defined(CONFIG_X86)
 659         {
 660                 .ctl_name       = KERN_PANIC_ON_NMI,
 661                 .procname       = "panic_on_unrecovered_nmi",
 662                 .data           = &panic_on_unrecovered_nmi,
 663                 .maxlen         = sizeof(int),
 664                 .mode           = 0644,
 665                 .proc_handler   = &proc_dointvec,
 666         },
 667         {
 668                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 669                 .procname       = "bootloader_type",
 670                 .data           = &bootloader_type,
 671                 .maxlen         = sizeof (int),
 672                 .mode           = 0444,
 673                 .proc_handler   = &proc_dointvec,
 674         },
 675         {
 676                 .ctl_name       = CTL_UNNUMBERED,
 677                 .procname       = "kstack_depth_to_print",
 678                 .data           = &kstack_depth_to_print,
 679                 .maxlen         = sizeof(int),
 680                 .mode           = 0644,
 681                 .proc_handler   = &proc_dointvec,
 682         },
 683 #endif
 684 #if defined(CONFIG_MMU)
 685         {
 686                 .ctl_name       = KERN_RANDOMIZE,
 687                 .procname       = "randomize_va_space",
 688                 .data           = &randomize_va_space,
 689                 .maxlen         = sizeof(int),
 690                 .mode           = 0644,
 691                 .proc_handler   = &proc_dointvec,
 692         },
 693 #endif
 694 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 695         {
 696                 .ctl_name       = KERN_SPIN_RETRY,
 697                 .procname       = "spin_retry",
 698                 .data           = &spin_retry,
 699                 .maxlen         = sizeof (int),
 700                 .mode           = 0644,
 701                 .proc_handler   = &proc_dointvec,
 702         },
 703 #endif
 704 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 705         {
 706                 .ctl_name       = KERN_ACPI_VIDEO_FLAGS,
 707                 .procname       = "acpi_video_flags",
 708                 .data           = &acpi_realmode_flags,
 709                 .maxlen         = sizeof (unsigned long),
 710                 .mode           = 0644,
 711                 .proc_handler   = &proc_doulongvec_minmax,
 712         },
 713 #endif
 714 #ifdef CONFIG_IA64
 715         {
 716                 .ctl_name       = KERN_IA64_UNALIGNED,
 717                 .procname       = "ignore-unaligned-usertrap",
 718                 .data           = &no_unaligned_warning,
 719                 .maxlen         = sizeof (int),
 720                 .mode           = 0644,
 721                 .proc_handler   = &proc_dointvec,
 722         },
 723 #endif
 724 #ifdef CONFIG_DETECT_SOFTLOCKUP
 725         {
 726                 .ctl_name       = CTL_UNNUMBERED,
 727                 .procname       = "softlockup_thresh",
 728                 .data           = &softlockup_thresh,
 729                 .maxlen         = sizeof(int),
 730                 .mode           = 0644,
 731                 .proc_handler   = &proc_dointvec_minmax,
 732                 .strategy       = &sysctl_intvec,
 733                 .extra1         = &one,
 734                 .extra2         = &sixty,
 735         },
 736 #endif
 737 #ifdef CONFIG_COMPAT
 738         {
 739                 .ctl_name       = KERN_COMPAT_LOG,
 740                 .procname       = "compat-log",
 741                 .data           = &compat_log,
 742                 .maxlen         = sizeof (int),
 743                 .mode           = 0644,
 744                 .proc_handler   = &proc_dointvec,
 745         },
 746 #endif
 747 #ifdef CONFIG_RT_MUTEXES
 748         {
 749                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 750                 .procname       = "max_lock_depth",
 751                 .data           = &max_lock_depth,
 752                 .maxlen         = sizeof(int),
 753                 .mode           = 0644,
 754                 .proc_handler   = &proc_dointvec,
 755         },
 756 #endif
 757 #ifdef CONFIG_PROC_FS
 758         {
 759                 .ctl_name       = CTL_UNNUMBERED,
 760                 .procname       = "maps_protect",
 761                 .data           = &maps_protect,
 762                 .maxlen         = sizeof(int),
 763                 .mode           = 0644,
 764                 .proc_handler   = &proc_dointvec,
 765         },
 766 #endif
 767         {
 768                 .ctl_name       = CTL_UNNUMBERED,
 769                 .procname       = "poweroff_cmd",
 770                 .data           = &poweroff_cmd,
 771                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 772                 .mode           = 0644,
 773                 .proc_handler   = &proc_dostring,
 774                 .strategy       = &sysctl_string,
 775         },
 776 /*
 777  * NOTE: do not add new entries to this table unless you have read
 778  * Documentation/sysctl/ctl_unnumbered.txt
 779  */
 780         { .ctl_name = 0 }
 781 };
 782
 783 static struct ctl_table vm_table[] = {
 784         {
 785                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 786                 .procname       = "overcommit_memory",
 787                 .data           = &sysctl_overcommit_memory,
 788                 .maxlen         = sizeof(sysctl_overcommit_memory),
 789                 .mode           = 0644,
 790                 .proc_handler   = &proc_dointvec,
 791         },
 792         {
 793                 .ctl_name       = VM_PANIC_ON_OOM,
 794                 .procname       = "panic_on_oom",
 795                 .data           = &sysctl_panic_on_oom,
 796                 .maxlen         = sizeof(sysctl_panic_on_oom),
 797                 .mode           = 0644,
 798                 .proc_handler   = &proc_dointvec,
 799         },
 800         {
 801                 .ctl_name       = CTL_UNNUMBERED,
 802                 .procname       = "oom_kill_allocating_task",
 803                 .data           = &sysctl_oom_kill_allocating_task,
 804                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 805                 .mode           = 0644,
 806                 .proc_handler   = &proc_dointvec,
 807         },
 808         {
 809                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 810                 .procname       = "overcommit_ratio",
 811                 .data           = &sysctl_overcommit_ratio,
 812                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 813                 .mode           = 0644,
 814                 .proc_handler   = &proc_dointvec,
 815         },
 816         {
 817                 .ctl_name       = VM_PAGE_CLUSTER,
 818                 .procname       = "page-cluster",
 819                 .data           = &page_cluster,
 820                 .maxlen         = sizeof(int),
 821                 .mode           = 0644,
 822                 .proc_handler   = &proc_dointvec,
 823         },
 824         {
 825                 .ctl_name       = VM_DIRTY_BACKGROUND,
 826                 .procname       = "dirty_background_ratio",
 827                 .data           = &dirty_background_ratio,
 828                 .maxlen         = sizeof(dirty_background_ratio),
 829                 .mode           = 0644,
 830                 .proc_handler   = &proc_dointvec_minmax,
 831                 .strategy       = &sysctl_intvec,
 832                 .extra1         = &zero,
 833                 .extra2         = &one_hundred,
 834         },
 835         {
 836                 .ctl_name       = VM_DIRTY_RATIO,
 837                 .procname       = "dirty_ratio",
 838                 .data           = &vm_dirty_ratio,
 839                 .maxlen         = sizeof(vm_dirty_ratio),
 840                 .mode           = 0644,
 841                 .proc_handler   = &dirty_ratio_handler,
 842                 .strategy       = &sysctl_intvec,
 843                 .extra1         = &zero,
 844                 .extra2         = &one_hundred,
 845         },
 846         {
 847                 .procname       = "dirty_writeback_centisecs",
 848                 .data           = &dirty_writeback_interval,
 849                 .maxlen         = sizeof(dirty_writeback_interval),
 850                 .mode           = 0644,
 851                 .proc_handler   = &dirty_writeback_centisecs_handler,
 852         },
 853         {
 854                 .procname       = "dirty_expire_centisecs",
 855                 .data           = &dirty_expire_interval,
 856                 .maxlen         = sizeof(dirty_expire_interval),
 857                 .mode           = 0644,
 858                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 859         },
 860         {
 861                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 862                 .procname       = "nr_pdflush_threads",
 863                 .data           = &nr_pdflush_threads,
 864                 .maxlen         = sizeof nr_pdflush_threads,
 865                 .mode           = 0444 /* read-only*/,
 866                 .proc_handler   = &proc_dointvec,
 867         },
 868         {
 869                 .ctl_name       = VM_SWAPPINESS,
 870                 .procname       = "swappiness",
 871                 .data           = &vm_swappiness,
 872                 .maxlen         = sizeof(vm_swappiness),
 873                 .mode           = 0644,
 874                 .proc_handler   = &proc_dointvec_minmax,
 875                 .strategy       = &sysctl_intvec,
 876                 .extra1         = &zero,
 877                 .extra2         = &one_hundred,
 878         },
 879 #ifdef CONFIG_HUGETLB_PAGE
 880          {
 881                 .procname       = "nr_hugepages",
 882                 .data           = &max_huge_pages,
 883                 .maxlen         = sizeof(unsigned long),
 884                 .mode           = 0644,
 885                 .proc_handler   = &hugetlb_sysctl_handler,
 886                 .extra1         = (void *)&hugetlb_zero,
 887                 .extra2         = (void *)&hugetlb_infinity,
 888          },
 889          {
 890                 .ctl_name       = VM_HUGETLB_GROUP,
 891                 .procname       = "hugetlb_shm_group",
 892                 .data           = &sysctl_hugetlb_shm_group,
 893                 .maxlen         = sizeof(gid_t),
 894                 .mode           = 0644,
 895                 .proc_handler   = &proc_dointvec,
 896          },
 897          {
 898                 .ctl_name       = CTL_UNNUMBERED,
 899                 .procname       = "hugepages_treat_as_movable",
 900                 .data           = &hugepages_treat_as_movable,
 901                 .maxlen         = sizeof(int),
 902                 .mode           = 0644,
 903                 .proc_handler   = &hugetlb_treat_movable_handler,
 904         },
 905         {
 906                 .ctl_name       = CTL_UNNUMBERED,
 907                 .procname       = "hugetlb_dynamic_pool",
 908                 .data           = &hugetlb_dynamic_pool,
 909                 .maxlen         = sizeof(hugetlb_dynamic_pool),
 910                 .mode           = 0644,
 911                 .proc_handler   = &proc_dointvec,
 912         },
 913 #endif
 914         {
 915                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 916                 .procname       = "lowmem_reserve_ratio",
 917                 .data           = &sysctl_lowmem_reserve_ratio,
 918                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 919                 .mode           = 0644,
 920                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 921                 .strategy       = &sysctl_intvec,
 922         },
 923         {
 924                 .ctl_name       = VM_DROP_PAGECACHE,
 925                 .procname       = "drop_caches",
 926                 .data           = &sysctl_drop_caches,
 927                 .maxlen         = sizeof(int),
 928                 .mode           = 0644,
 929                 .proc_handler   = drop_caches_sysctl_handler,
 930                 .strategy       = &sysctl_intvec,
 931         },
 932         {
 933                 .ctl_name       = VM_MIN_FREE_KBYTES,
 934                 .procname       = "min_free_kbytes",
 935                 .data           = &min_free_kbytes,
 936                 .maxlen         = sizeof(min_free_kbytes),
 937                 .mode           = 0644,
 938                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 939                 .strategy       = &sysctl_intvec,
 940                 .extra1         = &zero,
 941         },
 942         {
 943                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 944                 .procname       = "percpu_pagelist_fraction",
 945                 .data           = &percpu_pagelist_fraction,
 946                 .maxlen         = sizeof(percpu_pagelist_fraction),
 947                 .mode           = 0644,
 948                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 949                 .strategy       = &sysctl_intvec,
 950                 .extra1         = &min_percpu_pagelist_fract,
 951         },
 952 #ifdef CONFIG_MMU
 953         {
 954                 .ctl_name       = VM_MAX_MAP_COUNT,
 955                 .procname       = "max_map_count",
 956                 .data           = &sysctl_max_map_count,
 957                 .maxlen         = sizeof(sysctl_max_map_count),
 958                 .mode           = 0644,
 959                 .proc_handler   = &proc_dointvec
 960         },
 961 #endif
 962         {
 963                 .ctl_name       = VM_LAPTOP_MODE,
 964                 .procname       = "laptop_mode",
 965                 .data           = &laptop_mode,
 966                 .maxlen         = sizeof(laptop_mode),
 967                 .mode           = 0644,
 968                 .proc_handler   = &proc_dointvec_jiffies,
 969                 .strategy       = &sysctl_jiffies,
 970         },
 971         {
 972                 .ctl_name       = VM_BLOCK_DUMP,
 973                 .procname       = "block_dump",
 974                 .data           = &block_dump,
 975                 .maxlen         = sizeof(block_dump),
 976                 .mode           = 0644,
 977                 .proc_handler   = &proc_dointvec,
 978                 .strategy       = &sysctl_intvec,
 979                 .extra1         = &zero,
 980         },
 981         {
 982                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 983                 .procname       = "vfs_cache_pressure",
 984                 .data           = &sysctl_vfs_cache_pressure,
 985                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 986                 .mode           = 0644,
 987                 .proc_handler   = &proc_dointvec,
 988                 .strategy       = &sysctl_intvec,
 989                 .extra1         = &zero,
 990         },
 991 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 992         {
 993                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 994                 .procname       = "legacy_va_layout",
 995                 .data           = &sysctl_legacy_va_layout,
 996                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 997                 .mode           = 0644,
 998                 .proc_handler   = &proc_dointvec,
 999                 .strategy       = &sysctl_intvec,
1000                 .extra1         = &zero,
1001         },
1002 #endif
1003 #ifdef CONFIG_NUMA
1004         {
1005                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1006                 .procname       = "zone_reclaim_mode",
1007                 .data           = &zone_reclaim_mode,
1008                 .maxlen         = sizeof(zone_reclaim_mode),
1009                 .mode           = 0644,
1010                 .proc_handler   = &proc_dointvec,
1011                 .strategy       = &sysctl_intvec,
1012                 .extra1         = &zero,
1013         },
1014         {
1015                 .ctl_name       = VM_MIN_UNMAPPED,
1016                 .procname       = "min_unmapped_ratio",
1017                 .data           = &sysctl_min_unmapped_ratio,
1018                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1019                 .mode           = 0644,
1020                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1021                 .strategy       = &sysctl_intvec,
1022                 .extra1         = &zero,
1023                 .extra2         = &one_hundred,
1024         },
1025         {
1026                 .ctl_name       = VM_MIN_SLAB,
1027                 .procname       = "min_slab_ratio",
1028                 .data           = &sysctl_min_slab_ratio,
1029                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1030                 .mode           = 0644,
1031                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1032                 .strategy       = &sysctl_intvec,
1033                 .extra1         = &zero,
1034                 .extra2         = &one_hundred,
1035         },
1036 #endif
1037 #ifdef CONFIG_SMP
1038         {
1039                 .ctl_name       = CTL_UNNUMBERED,
1040                 .procname       = "stat_interval",
1041                 .data           = &sysctl_stat_interval,
1042                 .maxlen         = sizeof(sysctl_stat_interval),
1043                 .mode           = 0644,
1044                 .proc_handler   = &proc_dointvec_jiffies,
1045                 .strategy       = &sysctl_jiffies,
1046         },
1047 #endif
1048 #ifdef CONFIG_SECURITY
1049         {
1050                 .ctl_name       = CTL_UNNUMBERED,
1051                 .procname       = "mmap_min_addr",
1052                 .data           = &mmap_min_addr,
1053                 .maxlen         = sizeof(unsigned long),
1054                 .mode           = 0644,
1055                 .proc_handler   = &proc_doulongvec_minmax,
1056         },
1057 #endif
1058 #ifdef CONFIG_NUMA
1059         {
1060                 .ctl_name       = CTL_UNNUMBERED,
1061                 .procname       = "numa_zonelist_order",
1062                 .data           = &numa_zonelist_order,
1063                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1064                 .mode           = 0644,
1065                 .proc_handler   = &numa_zonelist_order_handler,
1066                 .strategy       = &sysctl_string,
1067         },
1068 #endif
1069 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1070    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1071         {
1072                 .ctl_name       = VM_VDSO_ENABLED,
1073                 .procname       = "vdso_enabled",
1074                 .data           = &vdso_enabled,
1075                 .maxlen         = sizeof(vdso_enabled),
1076                 .mode           = 0644,
1077                 .proc_handler   = &proc_dointvec,
1078                 .strategy       = &sysctl_intvec,
1079                 .extra1         = &zero,
1080         },
1081 #endif
1082 /*
1083  * NOTE: do not add new entries to this table unless you have read
1084  * Documentation/sysctl/ctl_unnumbered.txt
1085  */
1086         { .ctl_name = 0 }
1087 };
1088
1089 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1090 static struct ctl_table binfmt_misc_table[] = {
1091         { .ctl_name = 0 }
1092 };
1093 #endif
1094
1095 static struct ctl_table fs_table[] = {
1096         {
1097                 .ctl_name       = FS_NRINODE,
1098                 .procname       = "inode-nr",
1099                 .data           = &inodes_stat,
1100                 .maxlen         = 2*sizeof(int),
1101                 .mode           = 0444,
1102                 .proc_handler   = &proc_dointvec,
1103         },
1104         {
1105                 .ctl_name       = FS_STATINODE,
1106                 .procname       = "inode-state",
1107                 .data           = &inodes_stat,
1108                 .maxlen         = 7*sizeof(int),
1109                 .mode           = 0444,
1110                 .proc_handler   = &proc_dointvec,
1111         },
1112         {
1113                 .procname       = "file-nr",
1114                 .data           = &files_stat,
1115                 .maxlen         = 3*sizeof(int),
1116                 .mode           = 0444,
1117                 .proc_handler   = &proc_nr_files,
1118         },
1119         {
1120                 .ctl_name       = FS_MAXFILE,
1121                 .procname       = "file-max",
1122                 .data           = &files_stat.max_files,
1123                 .maxlen         = sizeof(int),
1124                 .mode           = 0644,
1125                 .proc_handler   = &proc_dointvec,
1126         },
1127         {
1128                 .ctl_name       = FS_DENTRY,
1129                 .procname       = "dentry-state",
1130                 .data           = &dentry_stat,
1131                 .maxlen         = 6*sizeof(int),
1132                 .mode           = 0444,
1133                 .proc_handler   = &proc_dointvec,
1134         },
1135         {
1136                 .ctl_name       = FS_OVERFLOWUID,
1137                 .procname       = "overflowuid",
1138                 .data           = &fs_overflowuid,
1139                 .maxlen         = sizeof(int),
1140                 .mode           = 0644,
1141                 .proc_handler   = &proc_dointvec_minmax,
1142                 .strategy       = &sysctl_intvec,
1143                 .extra1         = &minolduid,
1144                 .extra2         = &maxolduid,
1145         },
1146         {
1147                 .ctl_name       = FS_OVERFLOWGID,
1148                 .procname       = "overflowgid",
1149                 .data           = &fs_overflowgid,
1150                 .maxlen         = sizeof(int),
1151                 .mode           = 0644,
1152                 .proc_handler   = &proc_dointvec_minmax,
1153                 .strategy       = &sysctl_intvec,
1154                 .extra1         = &minolduid,
1155                 .extra2         = &maxolduid,
1156         },
1157         {
1158                 .ctl_name       = FS_LEASES,
1159                 .procname       = "leases-enable",
1160                 .data           = &leases_enable,
1161                 .maxlen         = sizeof(int),
1162                 .mode           = 0644,
1163                 .proc_handler   = &proc_dointvec,
1164         },
1165 #ifdef CONFIG_DNOTIFY
1166         {
1167                 .ctl_name       = FS_DIR_NOTIFY,
1168                 .procname       = "dir-notify-enable",
1169                 .data           = &dir_notify_enable,
1170                 .maxlen         = sizeof(int),
1171                 .mode           = 0644,
1172                 .proc_handler   = &proc_dointvec,
1173         },
1174 #endif
1175 #ifdef CONFIG_MMU
1176         {
1177                 .ctl_name       = FS_LEASE_TIME,
1178                 .procname       = "lease-break-time",
1179                 .data           = &lease_break_time,
1180                 .maxlen         = sizeof(int),
1181                 .mode           = 0644,
1182                 .proc_handler   = &proc_dointvec_minmax,
1183                 .strategy       = &sysctl_intvec,
1184                 .extra1         = &zero,
1185                 .extra2         = &two,
1186         },
1187         {
1188                 .ctl_name       = FS_AIO_NR,
1189                 .procname       = "aio-nr",
1190                 .data           = &aio_nr,
1191                 .maxlen         = sizeof(aio_nr),
1192                 .mode           = 0444,
1193                 .proc_handler   = &proc_doulongvec_minmax,
1194         },
1195         {
1196                 .ctl_name       = FS_AIO_MAX_NR,
1197                 .procname       = "aio-max-nr",
1198                 .data           = &aio_max_nr,
1199                 .maxlen         = sizeof(aio_max_nr),
1200                 .mode           = 0644,
1201                 .proc_handler   = &proc_doulongvec_minmax,
1202         },
1203 #ifdef CONFIG_INOTIFY_USER
1204         {
1205                 .ctl_name       = FS_INOTIFY,
1206                 .procname       = "inotify",
1207                 .mode           = 0555,
1208                 .child          = inotify_table,
1209         },
1210 #endif
1211 #endif
1212         {
1213                 .ctl_name       = KERN_SETUID_DUMPABLE,
1214                 .procname       = "suid_dumpable",
1215                 .data           = &suid_dumpable,
1216                 .maxlen         = sizeof(int),
1217                 .mode           = 0644,
1218                 .proc_handler   = &proc_dointvec,
1219         },
1220 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1221         {
1222                 .ctl_name       = CTL_UNNUMBERED,
1223                 .procname       = "binfmt_misc",
1224                 .mode           = 0555,
1225                 .child          = binfmt_misc_table,
1226         },
1227 #endif
1228 /*
1229  * NOTE: do not add new entries to this table unless you have read
1230  * Documentation/sysctl/ctl_unnumbered.txt
1231  */
1232         { .ctl_name = 0 }
1233 };
1234
1235 static struct ctl_table debug_table[] = {
1236 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1237         {
1238                 .ctl_name       = CTL_UNNUMBERED,
1239                 .procname       = "exception-trace",
1240                 .data           = &show_unhandled_signals,
1241                 .maxlen         = sizeof(int),
1242                 .mode           = 0644,
1243                 .proc_handler   = proc_dointvec
1244         },
1245 #endif
1246         { .ctl_name = 0 }
1247 };
1248
1249 static struct ctl_table dev_table[] = {
1250         { .ctl_name = 0 }
1251 };
1252
1253 static DEFINE_SPINLOCK(sysctl_lock);
1254
1255 /* called under sysctl_lock */
1256 static int use_table(struct ctl_table_header *p)
1257 {
1258         if (unlikely(p->unregistering))
1259                 return 0;
1260         p->used++;
1261         return 1;
1262 }
1263
1264 /* called under sysctl_lock */
1265 static void unuse_table(struct ctl_table_header *p)
1266 {
1267         if (!--p->used)
1268                 if (unlikely(p->unregistering))
1269                         complete(p->unregistering);
1270 }
1271
1272 /* called under sysctl_lock, will reacquire if has to wait */
1273 static void start_unregistering(struct ctl_table_header *p)
1274 {
1275         /*
1276          * if p->used is 0, nobody will ever touch that entry again;
1277          * we'll eliminate all paths to it before dropping sysctl_lock
1278          */
1279         if (unlikely(p->used)) {
1280                 struct completion wait;
1281                 init_completion(&wait);
1282                 p->unregistering = &wait;
1283                 spin_unlock(&sysctl_lock);
1284                 wait_for_completion(&wait);
1285                 spin_lock(&sysctl_lock);
1286         }
1287         /*
1288          * do not remove from the list until nobody holds it; walking the
1289          * list in do_sysctl() relies on that.
1290          */
1291         list_del_init(&p->ctl_entry);
1292 }
1293
1294 void sysctl_head_finish(struct ctl_table_header *head)
1295 {
1296         if (!head)
1297                 return;
1298         spin_lock(&sysctl_lock);
1299         unuse_table(head);
1300         spin_unlock(&sysctl_lock);
1301 }
1302
1303 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1304 {
1305         struct ctl_table_header *head;
1306         struct list_head *tmp;
1307         spin_lock(&sysctl_lock);
1308         if (prev) {
1309                 tmp = &prev->ctl_entry;
1310                 unuse_table(prev);
1311                 goto next;
1312         }
1313         tmp = &root_table_header.ctl_entry;
1314         for (;;) {
1315                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1316
1317                 if (!use_table(head))
1318                         goto next;
1319                 spin_unlock(&sysctl_lock);
1320                 return head;
1321         next:
1322                 tmp = tmp->next;
1323                 if (tmp == &root_table_header.ctl_entry)
1324                         break;
1325         }
1326         spin_unlock(&sysctl_lock);
1327         return NULL;
1328 }
1329
1330 #ifdef CONFIG_SYSCTL_SYSCALL
1331 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1332                void __user *newval, size_t newlen)
1333 {
1334         struct ctl_table_header *head;
1335         int error = -ENOTDIR;
1336
1337         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1338                 return -ENOTDIR;
1339         if (oldval) {
1340                 int old_len;
1341                 if (!oldlenp || get_user(old_len, oldlenp))
1342                         return -EFAULT;
1343         }
1344
1345         for (head = sysctl_head_next(NULL); head;
1346                         head = sysctl_head_next(head)) {
1347                 error = parse_table(name, nlen, oldval, oldlenp,
1348                                         newval, newlen, head->ctl_table);
1349                 if (error != -ENOTDIR) {
1350                         sysctl_head_finish(head);
1351                         break;
1352                 }
1353         }
1354         return error;
1355 }
1356
1357 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1358 {
1359         struct __sysctl_args tmp;
1360         int error;
1361
1362         if (copy_from_user(&tmp, args, sizeof(tmp)))
1363                 return -EFAULT;
1364
1365         lock_kernel();
1366         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1367                           tmp.newval, tmp.newlen);
1368         unlock_kernel();
1369         return error;
1370 }
1371 #endif /* CONFIG_SYSCTL_SYSCALL */
1372
1373 /*
1374  * sysctl_perm does NOT grant the superuser all rights automatically, because
1375  * some sysctl variables are readonly even to root.
1376  */
1377
1378 static int test_perm(int mode, int op)
1379 {
1380         if (!current->euid)
1381                 mode >>= 6;
1382         else if (in_egroup_p(0))
1383                 mode >>= 3;
1384         if ((mode & op & 0007) == op)
1385                 return 0;
1386         return -EACCES;
1387 }
1388
1389 int sysctl_perm(struct ctl_table *table, int op)
1390 {
1391         int error;
1392         error = security_sysctl(table, op);
1393         if (error)
1394                 return error;
1395         return test_perm(table->mode, op);
1396 }
1397
1398 #ifdef CONFIG_SYSCTL_SYSCALL
1399 static int parse_table(int __user *name, int nlen,
1400                        void __user *oldval, size_t __user *oldlenp,
1401                        void __user *newval, size_t newlen,
1402                        struct ctl_table *table)
1403 {
1404         int n;
1405 repeat:
1406         if (!nlen)
1407                 return -ENOTDIR;
1408         if (get_user(n, name))
1409                 return -EFAULT;
1410         for ( ; table->ctl_name || table->procname; table++) {
1411                 if (!table->ctl_name)
1412                         continue;
1413                 if (n == table->ctl_name) {
1414                         int error;
1415                         if (table->child) {
1416                                 if (sysctl_perm(table, 001))
1417                                         return -EPERM;
1418                                 name++;
1419                                 nlen--;
1420                                 table = table->child;
1421                                 goto repeat;
1422                         }
1423                         error = do_sysctl_strategy(table, name, nlen,
1424                                                    oldval, oldlenp,
1425                                                    newval, newlen);
1426                         return error;
1427                 }
1428         }
1429         return -ENOTDIR;
1430 }
1431
1432 /* Perform the actual read/write of a sysctl table entry. */
1433 int do_sysctl_strategy (struct ctl_table *table,
1434                         int __user *name, int nlen,
1435                         void __user *oldval, size_t __user *oldlenp,
1436                         void __user *newval, size_t newlen)
1437 {
1438         int op = 0, rc;
1439
1440         if (oldval)
1441                 op |= 004;
1442         if (newval)
1443                 op |= 002;
1444         if (sysctl_perm(table, op))
1445                 return -EPERM;
1446
1447         if (table->strategy) {
1448                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1449                                      newval, newlen);
1450                 if (rc < 0)
1451                         return rc;
1452                 if (rc > 0)
1453                         return 0;
1454         }
1455
1456         /* If there is no strategy routine, or if the strategy returns
1457          * zero, proceed with automatic r/w */
1458         if (table->data && table->maxlen) {
1459                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1460                                  newval, newlen);
1461                 if (rc < 0)
1462                         return rc;
1463         }
1464         return 0;
1465 }
1466 #endif /* CONFIG_SYSCTL_SYSCALL */
1467
1468 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1469 {
1470         for (; table->ctl_name || table->procname; table++) {
1471                 table->parent = parent;
1472                 if (table->child)
1473                         sysctl_set_parent(table, table->child);
1474         }
1475 }
1476
1477 static __init int sysctl_init(void)
1478 {
1479         sysctl_set_parent(NULL, root_table);
1480         return 0;
1481 }
1482
1483 core_initcall(sysctl_init);
1484
1485 /**
1486  * register_sysctl_table - register a sysctl hierarchy
1487  * @table: the top-level table structure
1488  *
1489  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1490  * array. An entry with a ctl_name of 0 terminates the table.
1491  *
1492  * The members of the &struct ctl_table structure are used as follows:
1493  *
1494  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1495  *            must be unique within that level of sysctl
1496  *
1497  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1498  *            enter a sysctl file
1499  *
1500  * data - a pointer to data for use by proc_handler
1501  *
1502  * maxlen - the maximum size in bytes of the data
1503  *
1504  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1505  *
1506  * child - a pointer to the child sysctl table if this entry is a directory, or
1507  *         %NULL.
1508  *
1509  * proc_handler - the text handler routine (described below)
1510  *
1511  * strategy - the strategy routine (described below)
1512  *
1513  * de - for internal use by the sysctl routines
1514  *
1515  * extra1, extra2 - extra pointers usable by the proc handler routines
1516  *
1517  * Leaf nodes in the sysctl tree will be represented by a single file
1518  * under /proc; non-leaf nodes will be represented by directories.
1519  *
1520  * sysctl(2) can automatically manage read and write requests through
1521  * the sysctl table.  The data and maxlen fields of the ctl_table
1522  * struct enable minimal validation of the values being written to be
1523  * performed, and the mode field allows minimal authentication.
1524  *
1525  * More sophisticated management can be enabled by the provision of a
1526  * strategy routine with the table entry.  This will be called before
1527  * any automatic read or write of the data is performed.
1528  *
1529  * The strategy routine may return
1530  *
1531  * < 0 - Error occurred (error is passed to user process)
1532  *
1533  * 0   - OK - proceed with automatic read or write.
1534  *
1535  * > 0 - OK - read or write has been done by the strategy routine, so
1536  *       return immediately.
1537  *
1538  * There must be a proc_handler routine for any terminal nodes
1539  * mirrored under /proc/sys (non-terminals are handled by a built-in
1540  * directory handler).  Several default handlers are available to
1541  * cover common cases -
1542  *
1543  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1544  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1545  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1546  *
1547  * It is the handler's job to read the input buffer from user memory
1548  * and process it. The handler should return 0 on success.
1549  *
1550  * This routine returns %NULL on a failure to register, and a pointer
1551  * to the table header on success.
1552  */
1553 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1554 {
1555         struct ctl_table_header *tmp;
1556         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1557         if (!tmp)
1558                 return NULL;
1559         tmp->ctl_table = table;
1560         INIT_LIST_HEAD(&tmp->ctl_entry);
1561         tmp->used = 0;
1562         tmp->unregistering = NULL;
1563         sysctl_set_parent(NULL, table);
1564         spin_lock(&sysctl_lock);
1565         list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1566         spin_unlock(&sysctl_lock);
1567         return tmp;
1568 }
1569
1570 /**
1571  * unregister_sysctl_table - unregister a sysctl table hierarchy
1572  * @header: the header returned from register_sysctl_table
1573  *
1574  * Unregisters the sysctl table and all children. proc entries may not
1575  * actually be removed until they are no longer used by anyone.
1576  */
1577 void unregister_sysctl_table(struct ctl_table_header * header)
1578 {
1579         might_sleep();
1580         spin_lock(&sysctl_lock);
1581         start_unregistering(header);
1582         spin_unlock(&sysctl_lock);
1583         kfree(header);
1584 }
1585
1586 #else /* !CONFIG_SYSCTL */
1587 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1588 {
1589         return NULL;
1590 }
1591
1592 void unregister_sysctl_table(struct ctl_table_header * table)
1593 {
1594 }
1595
1596 #endif /* CONFIG_SYSCTL */
1597
1598 /*
1599  * /proc/sys support
1600  */
1601
1602 #ifdef CONFIG_PROC_SYSCTL
1603
1604 static int _proc_do_string(void* data, int maxlen, int write,
1605                            struct file *filp, void __user *buffer,
1606                            size_t *lenp, loff_t *ppos)
1607 {
1608         size_t len;
1609         char __user *p;
1610         char c;
1611
1612         if (!data || !maxlen || !*lenp) {
1613                 *lenp = 0;
1614                 return 0;
1615         }
1616
1617         if (write) {
1618                 len = 0;
1619                 p = buffer;
1620                 while (len < *lenp) {
1621                         if (get_user(c, p++))
1622                                 return -EFAULT;
1623                         if (c == 0 || c == '\n')
1624                                 break;
1625                         len++;
1626                 }
1627                 if (len >= maxlen)
1628                         len = maxlen-1;
1629                 if(copy_from_user(data, buffer, len))
1630                         return -EFAULT;
1631                 ((char *) data)[len] = 0;
1632                 *ppos += *lenp;
1633         } else {
1634                 len = strlen(data);
1635                 if (len > maxlen)
1636                         len = maxlen;
1637
1638                 if (*ppos > len) {
1639                         *lenp = 0;
1640                         return 0;
1641                 }
1642
1643                 data += *ppos;
1644                 len  -= *ppos;
1645
1646                 if (len > *lenp)
1647                         len = *lenp;
1648                 if (len)
1649                         if(copy_to_user(buffer, data, len))
1650                                 return -EFAULT;
1651                 if (len < *lenp) {
1652                         if(put_user('\n', ((char __user *) buffer) + len))
1653                                 return -EFAULT;
1654                         len++;
1655                 }
1656                 *lenp = len;
1657                 *ppos += len;
1658         }
1659         return 0;
1660 }
1661
1662 /**
1663  * proc_dostring - read a string sysctl
1664  * @table: the sysctl table
1665  * @write: %TRUE if this is a write to the sysctl file
1666  * @filp: the file structure
1667  * @buffer: the user buffer
1668  * @lenp: the size of the user buffer
1669  * @ppos: file position
1670  *
1671  * Reads/writes a string from/to the user buffer. If the kernel
1672  * buffer provided is not large enough to hold the string, the
1673  * string is truncated. The copied string is %NULL-terminated.
1674  * If the string is being read by the user process, it is copied
1675  * and a newline '\n' is added. It is truncated if the buffer is
1676  * not large enough.
1677  *
1678  * Returns 0 on success.
1679  */
1680 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1681                   void __user *buffer, size_t *lenp, loff_t *ppos)
1682 {
1683         return _proc_do_string(table->data, table->maxlen, write, filp,
1684                                buffer, lenp, ppos);
1685 }
1686
1687
1688 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1689                                  int *valp,
1690                                  int write, void *data)
1691 {
1692         if (write) {
1693                 *valp = *negp ? -*lvalp : *lvalp;
1694         } else {
1695                 int val = *valp;
1696                 if (val < 0) {
1697                         *negp = -1;
1698                         *lvalp = (unsigned long)-val;
1699                 } else {
1700                         *negp = 0;
1701                         *lvalp = (unsigned long)val;
1702                 }
1703         }
1704         return 0;
1705 }
1706
1707 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1708                   int write, struct file *filp, void __user *buffer,
1709                   size_t *lenp, loff_t *ppos,
1710                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1711                               int write, void *data),
1712                   void *data)
1713 {
1714 #define TMPBUFLEN 21
1715         int *i, vleft, first=1, neg, val;
1716         unsigned long lval;
1717         size_t left, len;
1718
1719         char buf[TMPBUFLEN], *p;
1720         char __user *s = buffer;
1721
1722         if (!tbl_data || !table->maxlen || !*lenp ||
1723             (*ppos && !write)) {
1724                 *lenp = 0;
1725                 return 0;
1726         }
1727
1728         i = (int *) tbl_data;
1729         vleft = table->maxlen / sizeof(*i);
1730         left = *lenp;
1731
1732         if (!conv)
1733                 conv = do_proc_dointvec_conv;
1734
1735         for (; left && vleft--; i++, first=0) {
1736                 if (write) {
1737                         while (left) {
1738                                 char c;
1739                                 if (get_user(c, s))
1740                                         return -EFAULT;
1741                                 if (!isspace(c))
1742                                         break;
1743                                 left--;
1744                                 s++;
1745                         }
1746                         if (!left)
1747                                 break;
1748                         neg = 0;
1749                         len = left;
1750                         if (len > sizeof(buf) - 1)
1751                                 len = sizeof(buf) - 1;
1752                         if (copy_from_user(buf, s, len))
1753                                 return -EFAULT;
1754                         buf[len] = 0;
1755                         p = buf;
1756                         if (*p == '-' && left > 1) {
1757                                 neg = 1;
1758                                 p++;
1759                         }
1760                         if (*p < '0' || *p > '9')
1761                                 break;
1762
1763                         lval = simple_strtoul(p, &p, 0);
1764
1765                         len = p-buf;
1766                         if ((len < left) && *p && !isspace(*p))
1767                                 break;
1768                         if (neg)
1769                                 val = -val;
1770                         s += len;
1771                         left -= len;
1772
1773                         if (conv(&neg, &lval, i, 1, data))
1774                                 break;
1775                 } else {
1776                         p = buf;
1777                         if (!first)
1778                                 *p++ = '\t';
1779
1780                         if (conv(&neg, &lval, i, 0, data))
1781                                 break;
1782
1783                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1784                         len = strlen(buf);
1785                         if (len > left)
1786                                 len = left;
1787                         if(copy_to_user(s, buf, len))
1788                                 return -EFAULT;
1789                         left -= len;
1790                         s += len;
1791                 }
1792         }
1793
1794         if (!write && !first && left) {
1795                 if(put_user('\n', s))
1796                         return -EFAULT;
1797                 left--, s++;
1798         }
1799         if (write) {
1800                 while (left) {
1801                         char c;
1802                         if (get_user(c, s++))
1803                                 return -EFAULT;
1804                         if (!isspace(c))
1805                                 break;
1806                         left--;
1807                 }
1808         }
1809         if (write && first)
1810                 return -EINVAL;
1811         *lenp -= left;
1812         *ppos += *lenp;
1813         return 0;
1814 #undef TMPBUFLEN
1815 }
1816
1817 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1818                   void __user *buffer, size_t *lenp, loff_t *ppos,
1819                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1820                               int write, void *data),
1821                   void *data)
1822 {
1823         return __do_proc_dointvec(table->data, table, write, filp,
1824                         buffer, lenp, ppos, conv, data);
1825 }
1826
1827 /**
1828  * proc_dointvec - read a vector of integers
1829  * @table: the sysctl table
1830  * @write: %TRUE if this is a write to the sysctl file
1831  * @filp: the file structure
1832  * @buffer: the user buffer
1833  * @lenp: the size of the user buffer
1834  * @ppos: file position
1835  *
1836  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1837  * values from/to the user buffer, treated as an ASCII string.
1838  *
1839  * Returns 0 on success.
1840  */
1841 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1842                      void __user *buffer, size_t *lenp, loff_t *ppos)
1843 {
1844     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1845                             NULL,NULL);
1846 }
1847
1848 #define OP_SET  0
1849 #define OP_AND  1
1850 #define OP_OR   2
1851
1852 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1853                                       int *valp,
1854                                       int write, void *data)
1855 {
1856         int op = *(int *)data;
1857         if (write) {
1858                 int val = *negp ? -*lvalp : *lvalp;
1859                 switch(op) {
1860                 case OP_SET:    *valp = val; break;
1861                 case OP_AND:    *valp &= val; break;
1862                 case OP_OR:     *valp |= val; break;
1863                 }
1864         } else {
1865                 int val = *valp;
1866                 if (val < 0) {
1867                         *negp = -1;
1868                         *lvalp = (unsigned long)-val;
1869                 } else {
1870                         *negp = 0;
1871                         *lvalp = (unsigned long)val;
1872                 }
1873         }
1874         return 0;
1875 }
1876
1877 /*
1878  *      init may raise the set.
1879  */
1880
1881 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
1882                         void __user *buffer, size_t *lenp, loff_t *ppos)
1883 {
1884         int op;
1885
1886         if (write && !capable(CAP_SYS_MODULE)) {
1887                 return -EPERM;
1888         }
1889
1890         op = is_init(current) ? OP_SET : OP_AND;
1891         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1892                                 do_proc_dointvec_bset_conv,&op);
1893 }
1894
1895 /*
1896  *      Taint values can only be increased
1897  */
1898 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
1899                                void __user *buffer, size_t *lenp, loff_t *ppos)
1900 {
1901         int op;
1902
1903         if (write && !capable(CAP_SYS_ADMIN))
1904                 return -EPERM;
1905
1906         op = OP_OR;
1907         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1908                                 do_proc_dointvec_bset_conv,&op);
1909 }
1910
1911 struct do_proc_dointvec_minmax_conv_param {
1912         int *min;
1913         int *max;
1914 };
1915
1916 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1917                                         int *valp,
1918                                         int write, void *data)
1919 {
1920         struct do_proc_dointvec_minmax_conv_param *param = data;
1921         if (write) {
1922                 int val = *negp ? -*lvalp : *lvalp;
1923                 if ((param->min && *param->min > val) ||
1924                     (param->max && *param->max < val))
1925                         return -EINVAL;
1926                 *valp = val;
1927         } else {
1928                 int val = *valp;
1929                 if (val < 0) {
1930                         *negp = -1;
1931                         *lvalp = (unsigned long)-val;
1932                 } else {
1933                         *negp = 0;
1934                         *lvalp = (unsigned long)val;
1935                 }
1936         }
1937         return 0;
1938 }
1939
1940 /**
1941  * proc_dointvec_minmax - read a vector of integers with min/max values
1942  * @table: the sysctl table
1943  * @write: %TRUE if this is a write to the sysctl file
1944  * @filp: the file structure
1945  * @buffer: the user buffer
1946  * @lenp: the size of the user buffer
1947  * @ppos: file position
1948  *
1949  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1950  * values from/to the user buffer, treated as an ASCII string.
1951  *
1952  * This routine will ensure the values are within the range specified by
1953  * table->extra1 (min) and table->extra2 (max).
1954  *
1955  * Returns 0 on success.
1956  */
1957 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1958                   void __user *buffer, size_t *lenp, loff_t *ppos)
1959 {
1960         struct do_proc_dointvec_minmax_conv_param param = {
1961                 .min = (int *) table->extra1,
1962                 .max = (int *) table->extra2,
1963         };
1964         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1965                                 do_proc_dointvec_minmax_conv, &param);
1966 }
1967
1968 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1969                                      struct file *filp,
1970                                      void __user *buffer,
1971                                      size_t *lenp, loff_t *ppos,
1972                                      unsigned long convmul,
1973                                      unsigned long convdiv)
1974 {
1975 #define TMPBUFLEN 21
1976         unsigned long *i, *min, *max, val;
1977         int vleft, first=1, neg;
1978         size_t len, left;
1979         char buf[TMPBUFLEN], *p;
1980         char __user *s = buffer;
1981
1982         if (!data || !table->maxlen || !*lenp ||
1983             (*ppos && !write)) {
1984                 *lenp = 0;
1985                 return 0;
1986         }
1987
1988         i = (unsigned long *) data;
1989         min = (unsigned long *) table->extra1;
1990         max = (unsigned long *) table->extra2;
1991         vleft = table->maxlen / sizeof(unsigned long);
1992         left = *lenp;
1993
1994         for (; left && vleft--; i++, min++, max++, first=0) {
1995                 if (write) {
1996                         while (left) {
1997                                 char c;
1998                                 if (get_user(c, s))
1999                                         return -EFAULT;
2000                                 if (!isspace(c))
2001                                         break;
2002                                 left--;
2003                                 s++;
2004                         }
2005                         if (!left)
2006                                 break;
2007                         neg = 0;
2008                         len = left;
2009                         if (len > TMPBUFLEN-1)
2010                                 len = TMPBUFLEN-1;
2011                         if (copy_from_user(buf, s, len))
2012                                 return -EFAULT;
2013                         buf[len] = 0;
2014                         p = buf;
2015                         if (*p == '-' && left > 1) {
2016                                 neg = 1;
2017                                 p++;
2018                         }
2019                         if (*p < '0' || *p > '9')
2020                                 break;
2021                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2022                         len = p-buf;
2023                         if ((len < left) && *p && !isspace(*p))
2024                                 break;
2025                         if (neg)
2026                                 val = -val;
2027                         s += len;
2028                         left -= len;
2029
2030                         if(neg)
2031                                 continue;
2032                         if ((min && val < *min) || (max && val > *max))
2033                                 continue;
2034                         *i = val;
2035                 } else {
2036                         p = buf;
2037                         if (!first)
2038                                 *p++ = '\t';
2039                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2040                         len = strlen(buf);
2041                         if (len > left)
2042                                 len = left;
2043                         if(copy_to_user(s, buf, len))
2044                                 return -EFAULT;
2045                         left -= len;
2046                         s += len;
2047                 }
2048         }
2049
2050         if (!write && !first && left) {
2051                 if(put_user('\n', s))
2052                         return -EFAULT;
2053                 left--, s++;
2054         }
2055         if (write) {
2056                 while (left) {
2057                         char c;
2058                         if (get_user(c, s++))
2059                                 return -EFAULT;
2060                         if (!isspace(c))
2061                                 break;
2062                         left--;
2063                 }
2064         }
2065         if (write && first)
2066                 return -EINVAL;
2067         *lenp -= left;
2068         *ppos += *lenp;
2069         return 0;
2070 #undef TMPBUFLEN
2071 }
2072
2073 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2074                                      struct file *filp,
2075                                      void __user *buffer,
2076                                      size_t *lenp, loff_t *ppos,
2077                                      unsigned long convmul,
2078                                      unsigned long convdiv)
2079 {
2080         return __do_proc_doulongvec_minmax(table->data, table, write,
2081                         filp, buffer, lenp, ppos, convmul, convdiv);
2082 }
2083
2084 /**
2085  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2086  * @table: the sysctl table
2087  * @write: %TRUE if this is a write to the sysctl file
2088  * @filp: the file structure
2089  * @buffer: the user buffer
2090  * @lenp: the size of the user buffer
2091  * @ppos: file position
2092  *
2093  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2094  * values from/to the user buffer, treated as an ASCII string.
2095  *
2096  * This routine will ensure the values are within the range specified by
2097  * table->extra1 (min) and table->extra2 (max).
2098  *
2099  * Returns 0 on success.
2100  */
2101 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2102                            void __user *buffer, size_t *lenp, loff_t *ppos)
2103 {
2104     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2105 }
2106
2107 /**
2108  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2109  * @table: the sysctl table
2110  * @write: %TRUE if this is a write to the sysctl file
2111  * @filp: the file structure
2112  * @buffer: the user buffer
2113  * @lenp: the size of the user buffer
2114  * @ppos: file position
2115  *
2116  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2117  * values from/to the user buffer, treated as an ASCII string. The values
2118  * are treated as milliseconds, and converted to jiffies when they are stored.
2119  *
2120  * This routine will ensure the values are within the range specified by
2121  * table->extra1 (min) and table->extra2 (max).
2122  *
2123  * Returns 0 on success.
2124  */
2125 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2126                                       struct file *filp,
2127                                       void __user *buffer,
2128                                       size_t *lenp, loff_t *ppos)
2129 {
2130     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2131                                      lenp, ppos, HZ, 1000l);
2132 }
2133
2134
2135 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2136                                          int *valp,
2137                                          int write, void *data)
2138 {
2139         if (write) {
2140                 if (*lvalp > LONG_MAX / HZ)
2141                         return 1;
2142                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2143         } else {
2144                 int val = *valp;
2145                 unsigned long lval;
2146                 if (val < 0) {
2147                         *negp = -1;
2148                         lval = (unsigned long)-val;
2149                 } else {
2150                         *negp = 0;
2151                         lval = (unsigned long)val;
2152                 }
2153                 *lvalp = lval / HZ;
2154         }
2155         return 0;
2156 }
2157
2158 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2159                                                 int *valp,
2160                                                 int write, void *data)
2161 {
2162         if (write) {
2163                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2164                         return 1;
2165                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2166         } else {
2167                 int val = *valp;
2168                 unsigned long lval;
2169                 if (val < 0) {
2170                         *negp = -1;
2171                         lval = (unsigned long)-val;
2172                 } else {
2173                         *negp = 0;
2174                         lval = (unsigned long)val;
2175                 }
2176                 *lvalp = jiffies_to_clock_t(lval);
2177         }
2178         return 0;
2179 }
2180
2181 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2182                                             int *valp,
2183                                             int write, void *data)
2184 {
2185         if (write) {
2186                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2187         } else {
2188                 int val = *valp;
2189                 unsigned long lval;
2190                 if (val < 0) {
2191                         *negp = -1;
2192                         lval = (unsigned long)-val;
2193                 } else {
2194                         *negp = 0;
2195                         lval = (unsigned long)val;
2196                 }
2197                 *lvalp = jiffies_to_msecs(lval);
2198         }
2199         return 0;
2200 }
2201
2202 /**
2203  * proc_dointvec_jiffies - read a vector of integers as seconds
2204  * @table: the sysctl table
2205  * @write: %TRUE if this is a write to the sysctl file
2206  * @filp: the file structure
2207  * @buffer: the user buffer
2208  * @lenp: the size of the user buffer
2209  * @ppos: file position
2210  *
2211  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2212  * values from/to the user buffer, treated as an ASCII string.
2213  * The values read are assumed to be in seconds, and are converted into
2214  * jiffies.
2215  *
2216  * Returns 0 on success.
2217  */
2218 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2219                           void __user *buffer, size_t *lenp, loff_t *ppos)
2220 {
2221     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2222                             do_proc_dointvec_jiffies_conv,NULL);
2223 }
2224
2225 /**
2226  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2227  * @table: the sysctl table
2228  * @write: %TRUE if this is a write to the sysctl file
2229  * @filp: the file structure
2230  * @buffer: the user buffer
2231  * @lenp: the size of the user buffer
2232  * @ppos: pointer to the file position
2233  *
2234  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2235  * values from/to the user buffer, treated as an ASCII string.
2236  * The values read are assumed to be in 1/USER_HZ seconds, and
2237  * are converted into jiffies.
2238  *
2239  * Returns 0 on success.
2240  */
2241 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2242                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2243 {
2244     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2245                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2246 }
2247
2248 /**
2249  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2250  * @table: the sysctl table
2251  * @write: %TRUE if this is a write to the sysctl file
2252  * @filp: the file structure
2253  * @buffer: the user buffer
2254  * @lenp: the size of the user buffer
2255  * @ppos: file position
2256  * @ppos: the current position in the file
2257  *
2258  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2259  * values from/to the user buffer, treated as an ASCII string.
2260  * The values read are assumed to be in 1/1000 seconds, and
2261  * are converted into jiffies.
2262  *
2263  * Returns 0 on success.
2264  */
2265 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2266                              void __user *buffer, size_t *lenp, loff_t *ppos)
2267 {
2268         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2269                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2270 }
2271
2272 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2273                            void __user *buffer, size_t *lenp, loff_t *ppos)
2274 {
2275         struct pid *new_pid;
2276         pid_t tmp;
2277         int r;
2278
2279         tmp = pid_nr(cad_pid);
2280
2281         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2282                                lenp, ppos, NULL, NULL);
2283         if (r || !write)
2284                 return r;
2285
2286         new_pid = find_get_pid(tmp);
2287         if (!new_pid)
2288                 return -ESRCH;
2289
2290         put_pid(xchg(&cad_pid, new_pid));
2291         return 0;
2292 }
2293
2294 #else /* CONFIG_PROC_FS */
2295
2296 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2297                   void __user *buffer, size_t *lenp, loff_t *ppos)
2298 {
2299         return -ENOSYS;
2300 }
2301
2302 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2303                   void __user *buffer, size_t *lenp, loff_t *ppos)
2304 {
2305         return -ENOSYS;
2306 }
2307
2308 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2309                         void __user *buffer, size_t *lenp, loff_t *ppos)
2310 {
2311         return -ENOSYS;
2312 }
2313
2314 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2315                     void __user *buffer, size_t *lenp, loff_t *ppos)
2316 {
2317         return -ENOSYS;
2318 }
2319
2320 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2321                     void __user *buffer, size_t *lenp, loff_t *ppos)
2322 {
2323         return -ENOSYS;
2324 }
2325
2326 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2327                     void __user *buffer, size_t *lenp, loff_t *ppos)
2328 {
2329         return -ENOSYS;
2330 }
2331
2332 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2333                              void __user *buffer, size_t *lenp, loff_t *ppos)
2334 {
2335         return -ENOSYS;
2336 }
2337
2338 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2339                     void __user *buffer, size_t *lenp, loff_t *ppos)
2340 {
2341         return -ENOSYS;
2342 }
2343
2344 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2345                                       struct file *filp,
2346                                       void __user *buffer,
2347                                       size_t *lenp, loff_t *ppos)
2348 {
2349     return -ENOSYS;
2350 }
2351
2352
2353 #endif /* CONFIG_PROC_FS */
2354
2355
2356 #ifdef CONFIG_SYSCTL_SYSCALL
2357 /*
2358  * General sysctl support routines
2359  */
2360
2361 /* The generic sysctl data routine (used if no strategy routine supplied) */
2362 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2363                 void __user *oldval, size_t __user *oldlenp,
2364                 void __user *newval, size_t newlen)
2365 {
2366         size_t len;
2367
2368         /* Get out of I don't have a variable */
2369         if (!table->data || !table->maxlen)
2370                 return -ENOTDIR;
2371
2372         if (oldval && oldlenp) {
2373                 if (get_user(len, oldlenp))
2374                         return -EFAULT;
2375                 if (len) {
2376                         if (len > table->maxlen)
2377                                 len = table->maxlen;
2378                         if (copy_to_user(oldval, table->data, len))
2379                                 return -EFAULT;
2380                         if (put_user(len, oldlenp))
2381                                 return -EFAULT;
2382                 }
2383         }
2384
2385         if (newval && newlen) {
2386                 if (newlen > table->maxlen)
2387                         newlen = table->maxlen;
2388
2389                 if (copy_from_user(table->data, newval, newlen))
2390                         return -EFAULT;
2391         }
2392         return 1;
2393 }
2394
2395 /* The generic string strategy routine: */
2396 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2397                   void __user *oldval, size_t __user *oldlenp,
2398                   void __user *newval, size_t newlen)
2399 {
2400         if (!table->data || !table->maxlen)
2401                 return -ENOTDIR;
2402
2403         if (oldval && oldlenp) {
2404                 size_t bufsize;
2405                 if (get_user(bufsize, oldlenp))
2406                         return -EFAULT;
2407                 if (bufsize) {
2408                         size_t len = strlen(table->data), copied;
2409
2410                         /* This shouldn't trigger for a well-formed sysctl */
2411                         if (len > table->maxlen)
2412                                 len = table->maxlen;
2413
2414                         /* Copy up to a max of bufsize-1 bytes of the string */
2415                         copied = (len >= bufsize) ? bufsize - 1 : len;
2416
2417                         if (copy_to_user(oldval, table->data, copied) ||
2418                             put_user(0, (char __user *)(oldval + copied)))
2419                                 return -EFAULT;
2420                         if (put_user(len, oldlenp))
2421                                 return -EFAULT;
2422                 }
2423         }
2424         if (newval && newlen) {
2425                 size_t len = newlen;
2426                 if (len > table->maxlen)
2427                         len = table->maxlen;
2428                 if(copy_from_user(table->data, newval, len))
2429                         return -EFAULT;
2430                 if (len == table->maxlen)
2431                         len--;
2432                 ((char *) table->data)[len] = 0;
2433         }
2434         return 1;
2435 }
2436
2437 /*
2438  * This function makes sure that all of the integers in the vector
2439  * are between the minimum and maximum values given in the arrays
2440  * table->extra1 and table->extra2, respectively.
2441  */
2442 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2443                 void __user *oldval, size_t __user *oldlenp,
2444                 void __user *newval, size_t newlen)
2445 {
2446
2447         if (newval && newlen) {
2448                 int __user *vec = (int __user *) newval;
2449                 int *min = (int *) table->extra1;
2450                 int *max = (int *) table->extra2;
2451                 size_t length;
2452                 int i;
2453
2454                 if (newlen % sizeof(int) != 0)
2455                         return -EINVAL;
2456
2457                 if (!table->extra1 && !table->extra2)
2458                         return 0;
2459
2460                 if (newlen > table->maxlen)
2461                         newlen = table->maxlen;
2462                 length = newlen / sizeof(int);
2463
2464                 for (i = 0; i < length; i++) {
2465                         int value;
2466                         if (get_user(value, vec + i))
2467                                 return -EFAULT;
2468                         if (min && value < min[i])
2469                                 return -EINVAL;
2470                         if (max && value > max[i])
2471                                 return -EINVAL;
2472                 }
2473         }
2474         return 0;
2475 }
2476
2477 /* Strategy function to convert jiffies to seconds */
2478 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2479                 void __user *oldval, size_t __user *oldlenp,
2480                 void __user *newval, size_t newlen)
2481 {
2482         if (oldval && oldlenp) {
2483                 size_t olen;
2484
2485                 if (get_user(olen, oldlenp))
2486                         return -EFAULT;
2487                 if (olen) {
2488                         int val;
2489
2490                         if (olen < sizeof(int))
2491                                 return -EINVAL;
2492
2493                         val = *(int *)(table->data) / HZ;
2494                         if (put_user(val, (int __user *)oldval))
2495                                 return -EFAULT;
2496                         if (put_user(sizeof(int), oldlenp))
2497                                 return -EFAULT;
2498                 }
2499         }
2500         if (newval && newlen) {
2501                 int new;
2502                 if (newlen != sizeof(int))
2503                         return -EINVAL;
2504                 if (get_user(new, (int __user *)newval))
2505                         return -EFAULT;
2506                 *(int *)(table->data) = new*HZ;
2507         }
2508         return 1;
2509 }
2510
2511 /* Strategy function to convert jiffies to seconds */
2512 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2513                 void __user *oldval, size_t __user *oldlenp,
2514                 void __user *newval, size_t newlen)
2515 {
2516         if (oldval && oldlenp) {
2517                 size_t olen;
2518
2519                 if (get_user(olen, oldlenp))
2520                         return -EFAULT;
2521                 if (olen) {
2522                         int val;
2523
2524                         if (olen < sizeof(int))
2525                                 return -EINVAL;
2526
2527                         val = jiffies_to_msecs(*(int *)(table->data));
2528                         if (put_user(val, (int __user *)oldval))
2529                                 return -EFAULT;
2530                         if (put_user(sizeof(int), oldlenp))
2531                                 return -EFAULT;
2532                 }
2533         }
2534         if (newval && newlen) {
2535                 int new;
2536                 if (newlen != sizeof(int))
2537                         return -EINVAL;
2538                 if (get_user(new, (int __user *)newval))
2539                         return -EFAULT;
2540                 *(int *)(table->data) = msecs_to_jiffies(new);
2541         }
2542         return 1;
2543 }
2544
2545
2546
2547 #else /* CONFIG_SYSCTL_SYSCALL */
2548
2549
2550 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2551 {
2552         static int msg_count;
2553         struct __sysctl_args tmp;
2554         int name[CTL_MAXNAME];
2555         int i;
2556
2557         /* Read in the sysctl name for better debug message logging */
2558         if (copy_from_user(&tmp, args, sizeof(tmp)))
2559                 return -EFAULT;
2560         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2561                 return -ENOTDIR;
2562         for (i = 0; i < tmp.nlen; i++)
2563                 if (get_user(name[i], tmp.name + i))
2564                         return -EFAULT;
2565
2566         /* Ignore accesses to kernel.version */
2567         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2568                 goto out;
2569
2570         if (msg_count < 5) {
2571                 msg_count++;
2572                 printk(KERN_INFO
2573                         "warning: process `%s' used the removed sysctl "
2574                         "system call with ", current->comm);
2575                 for (i = 0; i < tmp.nlen; i++)
2576                         printk("%d.", name[i]);
2577                 printk("\n");
2578         }
2579 out:
2580         return -ENOSYS;
2581 }
2582
2583 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2584                   void __user *oldval, size_t __user *oldlenp,
2585                   void __user *newval, size_t newlen)
2586 {
2587         return -ENOSYS;
2588 }
2589
2590 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2591                   void __user *oldval, size_t __user *oldlenp,
2592                   void __user *newval, size_t newlen)
2593 {
2594         return -ENOSYS;
2595 }
2596
2597 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2598                 void __user *oldval, size_t __user *oldlenp,
2599                 void __user *newval, size_t newlen)
2600 {
2601         return -ENOSYS;
2602 }
2603
2604 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2605                 void __user *oldval, size_t __user *oldlenp,
2606                 void __user *newval, size_t newlen)
2607 {
2608         return -ENOSYS;
2609 }
2610
2611 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2612                 void __user *oldval, size_t __user *oldlenp,
2613                 void __user *newval, size_t newlen)
2614 {
2615         return -ENOSYS;
2616 }
2617
2618 #endif /* CONFIG_SYSCTL_SYSCALL */
2619
2620 /*
2621  * No sense putting this after each symbol definition, twice,
2622  * exception granted :-)
2623  */
2624 EXPORT_SYMBOL(proc_dointvec);
2625 EXPORT_SYMBOL(proc_dointvec_jiffies);
2626 EXPORT_SYMBOL(proc_dointvec_minmax);
2627 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2628 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2629 EXPORT_SYMBOL(proc_dostring);
2630 EXPORT_SYMBOL(proc_doulongvec_minmax);
2631 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2632 EXPORT_SYMBOL(register_sysctl_table);
2633 EXPORT_SYMBOL(sysctl_intvec);
2634 EXPORT_SYMBOL(sysctl_jiffies);
2635 EXPORT_SYMBOL(sysctl_ms_jiffies);
2636 EXPORT_SYMBOL(sysctl_string);
2637 EXPORT_SYMBOL(sysctl_data);
2638 EXPORT_SYMBOL(unregister_sysctl_table);