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

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/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 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  59
  60 #if defined(CONFIG_SYSCTL)
  61
  62 /* External variables not in a header file. */
  63 extern int C_A_D;
  64 extern int print_fatal_signals;
  65 extern int sysctl_overcommit_memory;
  66 extern int sysctl_overcommit_ratio;
  67 extern int sysctl_panic_on_oom;
  68 extern int sysctl_oom_kill_allocating_task;
  69 extern int max_threads;
  70 extern int core_uses_pid;
  71 extern int suid_dumpable;
  72 extern char core_pattern[];
  73 extern int pid_max;
  74 extern int min_free_kbytes;
  75 extern int printk_ratelimit_jiffies;
  76 extern int printk_ratelimit_burst;
  77 extern int pid_max_min, pid_max_max;
  78 extern int sysctl_drop_caches;
  79 extern int percpu_pagelist_fraction;
  80 extern int compat_log;
  81 extern int maps_protect;
  82 extern int sysctl_stat_interval;
  83 extern int audit_argv_kb;
  84
  85 /* Constants used for minimum and  maximum */
  86 #ifdef CONFIG_DETECT_SOFTLOCKUP
  87 static int one = 1;
  88 static int sixty = 60;
  89 #endif
  90
  91 #ifdef CONFIG_MMU
  92 static int two = 2;
  93 #endif
  94
  95 static int zero;
  96 static int one_hundred = 100;
  97
  98 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
  99 static int maxolduid = 65535;
 100 static int minolduid;
 101 static int min_percpu_pagelist_fract = 8;
 102
 103 static int ngroups_max = NGROUPS_MAX;
 104
 105 #ifdef CONFIG_KMOD
 106 extern char modprobe_path[];
 107 #endif
 108 #ifdef CONFIG_CHR_DEV_SG
 109 extern int sg_big_buff;
 110 #endif
 111
 112 #ifdef __sparc__
 113 extern char reboot_command [];
 114 extern int stop_a_enabled;
 115 extern int scons_pwroff;
 116 #endif
 117
 118 #ifdef __hppa__
 119 extern int pwrsw_enabled;
 120 extern int unaligned_enabled;
 121 #endif
 122
 123 #ifdef CONFIG_S390
 124 #ifdef CONFIG_MATHEMU
 125 extern int sysctl_ieee_emulation_warnings;
 126 #endif
 127 extern int sysctl_userprocess_debug;
 128 extern int spin_retry;
 129 #endif
 130
 131 extern int sysctl_hz_timer;
 132
 133 #ifdef CONFIG_BSD_PROCESS_ACCT
 134 extern int acct_parm[];
 135 #endif
 136
 137 #ifdef CONFIG_IA64
 138 extern int no_unaligned_warning;
 139 #endif
 140
 141 #ifdef CONFIG_RT_MUTEXES
 142 extern int max_lock_depth;
 143 #endif
 144
 145 #ifdef CONFIG_SYSCTL_SYSCALL
 146 static int parse_table(int __user *, int, void __user *, size_t __user *,
 147                 void __user *, size_t, struct ctl_table *);
 148 #endif
 149
 150
 151 #ifdef CONFIG_PROC_SYSCTL
 152 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 153                   void __user *buffer, size_t *lenp, loff_t *ppos);
 154 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 155                                void __user *buffer, size_t *lenp, loff_t *ppos);
 156 #endif
 157
 158 static struct ctl_table root_table[];
 159 static struct ctl_table_header root_table_header =
 160         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 161
 162 static struct ctl_table kern_table[];
 163 static struct ctl_table vm_table[];
 164 static struct ctl_table fs_table[];
 165 static struct ctl_table debug_table[];
 166 static struct ctl_table dev_table[];
 167 extern struct ctl_table random_table[];
 168 #ifdef CONFIG_INOTIFY_USER
 169 extern struct ctl_table inotify_table[];
 170 #endif
 171
 172 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 173 int sysctl_legacy_va_layout;
 174 #endif
 175
 176 extern int prove_locking;
 177 extern int lock_stat;
 178
 179 /* The default sysctl tables: */
 180
 181 static struct ctl_table root_table[] = {
 182         {
 183                 .ctl_name       = CTL_KERN,
 184                 .procname       = "kernel",
 185                 .mode           = 0555,
 186                 .child          = kern_table,
 187         },
 188         {
 189                 .ctl_name       = CTL_VM,
 190                 .procname       = "vm",
 191                 .mode           = 0555,
 192                 .child          = vm_table,
 193         },
 194 #ifdef CONFIG_NET
 195         {
 196                 .ctl_name       = CTL_NET,
 197                 .procname       = "net",
 198                 .mode           = 0555,
 199                 .child          = net_table,
 200         },
 201 #endif
 202         {
 203                 .ctl_name       = CTL_FS,
 204                 .procname       = "fs",
 205                 .mode           = 0555,
 206                 .child          = fs_table,
 207         },
 208         {
 209                 .ctl_name       = CTL_DEBUG,
 210                 .procname       = "debug",
 211                 .mode           = 0555,
 212                 .child          = debug_table,
 213         },
 214         {
 215                 .ctl_name       = CTL_DEV,
 216                 .procname       = "dev",
 217                 .mode           = 0555,
 218                 .child          = dev_table,
 219         },
 220 /*
 221  * NOTE: do not add new entries to this table unless you have read
 222  * Documentation/sysctl/ctl_unnumbered.txt
 223  */
 224         { .ctl_name = 0 }
 225 };
 226
 227 #ifdef CONFIG_SCHED_DEBUG
 228 static unsigned long min_sched_granularity_ns = 100000;         /* 100 usecs */
 229 static unsigned long max_sched_granularity_ns = 1000000000;     /* 1 second */
 230 static unsigned long min_wakeup_granularity_ns;                 /* 0 usecs */
 231 static unsigned long max_wakeup_granularity_ns = 1000000000;    /* 1 second */
 232 #endif
 233
 234 static struct ctl_table kern_table[] = {
 235 #ifdef CONFIG_SCHED_DEBUG
 236         {
 237                 .ctl_name       = CTL_UNNUMBERED,
 238                 .procname       = "sched_nr_latency",
 239                 .data           = &sysctl_sched_nr_latency,
 240                 .maxlen         = sizeof(unsigned int),
 241                 .mode           = 0644,
 242                 .proc_handler   = &proc_dointvec,
 243         },
 244         {
 245                 .ctl_name       = CTL_UNNUMBERED,
 246                 .procname       = "sched_latency_ns",
 247                 .data           = &sysctl_sched_latency,
 248                 .maxlen         = sizeof(unsigned int),
 249                 .mode           = 0644,
 250                 .proc_handler   = &proc_dointvec_minmax,
 251                 .strategy       = &sysctl_intvec,
 252                 .extra1         = &min_sched_granularity_ns,
 253                 .extra2         = &max_sched_granularity_ns,
 254         },
 255         {
 256                 .ctl_name       = CTL_UNNUMBERED,
 257                 .procname       = "sched_wakeup_granularity_ns",
 258                 .data           = &sysctl_sched_wakeup_granularity,
 259                 .maxlen         = sizeof(unsigned int),
 260                 .mode           = 0644,
 261                 .proc_handler   = &proc_dointvec_minmax,
 262                 .strategy       = &sysctl_intvec,
 263                 .extra1         = &min_wakeup_granularity_ns,
 264                 .extra2         = &max_wakeup_granularity_ns,
 265         },
 266         {
 267                 .ctl_name       = CTL_UNNUMBERED,
 268                 .procname       = "sched_batch_wakeup_granularity_ns",
 269                 .data           = &sysctl_sched_batch_wakeup_granularity,
 270                 .maxlen         = sizeof(unsigned int),
 271                 .mode           = 0644,
 272                 .proc_handler   = &proc_dointvec_minmax,
 273                 .strategy       = &sysctl_intvec,
 274                 .extra1         = &min_wakeup_granularity_ns,
 275                 .extra2         = &max_wakeup_granularity_ns,
 276         },
 277         {
 278                 .ctl_name       = CTL_UNNUMBERED,
 279                 .procname       = "sched_child_runs_first",
 280                 .data           = &sysctl_sched_child_runs_first,
 281                 .maxlen         = sizeof(unsigned int),
 282                 .mode           = 0644,
 283                 .proc_handler   = &proc_dointvec,
 284         },
 285         {
 286                 .ctl_name       = CTL_UNNUMBERED,
 287                 .procname       = "sched_features",
 288                 .data           = &sysctl_sched_features,
 289                 .maxlen         = sizeof(unsigned int),
 290                 .mode           = 0644,
 291                 .proc_handler   = &proc_dointvec,
 292         },
 293         {
 294                 .ctl_name       = CTL_UNNUMBERED,
 295                 .procname       = "sched_migration_cost",
 296                 .data           = &sysctl_sched_migration_cost,
 297                 .maxlen         = sizeof(unsigned int),
 298                 .mode           = 0644,
 299                 .proc_handler   = &proc_dointvec,
 300         },
 301 #endif
 302         {
 303                 .ctl_name       = CTL_UNNUMBERED,
 304                 .procname       = "sched_compat_yield",
 305                 .data           = &sysctl_sched_compat_yield,
 306                 .maxlen         = sizeof(unsigned int),
 307                 .mode           = 0644,
 308                 .proc_handler   = &proc_dointvec,
 309         },
 310 #ifdef CONFIG_PROVE_LOCKING
 311         {
 312                 .ctl_name       = CTL_UNNUMBERED,
 313                 .procname       = "prove_locking",
 314                 .data           = &prove_locking,
 315                 .maxlen         = sizeof(int),
 316                 .mode           = 0644,
 317                 .proc_handler   = &proc_dointvec,
 318         },
 319 #endif
 320 #ifdef CONFIG_LOCK_STAT
 321         {
 322                 .ctl_name       = CTL_UNNUMBERED,
 323                 .procname       = "lock_stat",
 324                 .data           = &lock_stat,
 325                 .maxlen         = sizeof(int),
 326                 .mode           = 0644,
 327                 .proc_handler   = &proc_dointvec,
 328         },
 329 #endif
 330         {
 331                 .ctl_name       = KERN_PANIC,
 332                 .procname       = "panic",
 333                 .data           = &panic_timeout,
 334                 .maxlen         = sizeof(int),
 335                 .mode           = 0644,
 336                 .proc_handler   = &proc_dointvec,
 337         },
 338         {
 339                 .ctl_name       = KERN_CORE_USES_PID,
 340                 .procname       = "core_uses_pid",
 341                 .data           = &core_uses_pid,
 342                 .maxlen         = sizeof(int),
 343                 .mode           = 0644,
 344                 .proc_handler   = &proc_dointvec,
 345         },
 346 #ifdef CONFIG_AUDITSYSCALL
 347         {
 348                 .ctl_name       = CTL_UNNUMBERED,
 349                 .procname       = "audit_argv_kb",
 350                 .data           = &audit_argv_kb,
 351                 .maxlen         = sizeof(int),
 352                 .mode           = 0644,
 353                 .proc_handler   = &proc_dointvec,
 354         },
 355 #endif
 356         {
 357                 .ctl_name       = KERN_CORE_PATTERN,
 358                 .procname       = "core_pattern",
 359                 .data           = core_pattern,
 360                 .maxlen         = CORENAME_MAX_SIZE,
 361                 .mode           = 0644,
 362                 .proc_handler   = &proc_dostring,
 363                 .strategy       = &sysctl_string,
 364         },
 365 #ifdef CONFIG_PROC_SYSCTL
 366         {
 367                 .procname       = "tainted",
 368                 .data           = &tainted,
 369                 .maxlen         = sizeof(int),
 370                 .mode           = 0644,
 371                 .proc_handler   = &proc_dointvec_taint,
 372         },
 373 #endif
 374 #ifdef CONFIG_SECURITY_CAPABILITIES
 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 #endif /* def CONFIG_SECURITY_CAPABILITIES */
 383 #ifdef CONFIG_BLK_DEV_INITRD
 384         {
 385                 .ctl_name       = KERN_REALROOTDEV,
 386                 .procname       = "real-root-dev",
 387                 .data           = &real_root_dev,
 388                 .maxlen         = sizeof(int),
 389                 .mode           = 0644,
 390                 .proc_handler   = &proc_dointvec,
 391         },
 392 #endif
 393         {
 394                 .ctl_name       = CTL_UNNUMBERED,
 395                 .procname       = "print-fatal-signals",
 396                 .data           = &print_fatal_signals,
 397                 .maxlen         = sizeof(int),
 398                 .mode           = 0644,
 399                 .proc_handler   = &proc_dointvec,
 400         },
 401 #ifdef __sparc__
 402         {
 403                 .ctl_name       = KERN_SPARC_REBOOT,
 404                 .procname       = "reboot-cmd",
 405                 .data           = reboot_command,
 406                 .maxlen         = 256,
 407                 .mode           = 0644,
 408                 .proc_handler   = &proc_dostring,
 409                 .strategy       = &sysctl_string,
 410         },
 411         {
 412                 .ctl_name       = KERN_SPARC_STOP_A,
 413                 .procname       = "stop-a",
 414                 .data           = &stop_a_enabled,
 415                 .maxlen         = sizeof (int),
 416                 .mode           = 0644,
 417                 .proc_handler   = &proc_dointvec,
 418         },
 419         {
 420                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 421                 .procname       = "scons-poweroff",
 422                 .data           = &scons_pwroff,
 423                 .maxlen         = sizeof (int),
 424                 .mode           = 0644,
 425                 .proc_handler   = &proc_dointvec,
 426         },
 427 #endif
 428 #ifdef __hppa__
 429         {
 430                 .ctl_name       = KERN_HPPA_PWRSW,
 431                 .procname       = "soft-power",
 432                 .data           = &pwrsw_enabled,
 433                 .maxlen         = sizeof (int),
 434                 .mode           = 0644,
 435                 .proc_handler   = &proc_dointvec,
 436         },
 437         {
 438                 .ctl_name       = KERN_HPPA_UNALIGNED,
 439                 .procname       = "unaligned-trap",
 440                 .data           = &unaligned_enabled,
 441                 .maxlen         = sizeof (int),
 442                 .mode           = 0644,
 443                 .proc_handler   = &proc_dointvec,
 444         },
 445 #endif
 446         {
 447                 .ctl_name       = KERN_CTLALTDEL,
 448                 .procname       = "ctrl-alt-del",
 449                 .data           = &C_A_D,
 450                 .maxlen         = sizeof(int),
 451                 .mode           = 0644,
 452                 .proc_handler   = &proc_dointvec,
 453         },
 454         {
 455                 .ctl_name       = KERN_PRINTK,
 456                 .procname       = "printk",
 457                 .data           = &console_loglevel,
 458                 .maxlen         = 4*sizeof(int),
 459                 .mode           = 0644,
 460                 .proc_handler   = &proc_dointvec,
 461         },
 462 #ifdef CONFIG_KMOD
 463         {
 464                 .ctl_name       = KERN_MODPROBE,
 465                 .procname       = "modprobe",
 466                 .data           = &modprobe_path,
 467                 .maxlen         = KMOD_PATH_LEN,
 468                 .mode           = 0644,
 469                 .proc_handler   = &proc_dostring,
 470                 .strategy       = &sysctl_string,
 471         },
 472 #endif
 473 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 474         {
 475                 .ctl_name       = KERN_HOTPLUG,
 476                 .procname       = "hotplug",
 477                 .data           = &uevent_helper,
 478                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 479                 .mode           = 0644,
 480                 .proc_handler   = &proc_dostring,
 481                 .strategy       = &sysctl_string,
 482         },
 483 #endif
 484 #ifdef CONFIG_CHR_DEV_SG
 485         {
 486                 .ctl_name       = KERN_SG_BIG_BUFF,
 487                 .procname       = "sg-big-buff",
 488                 .data           = &sg_big_buff,
 489                 .maxlen         = sizeof (int),
 490                 .mode           = 0444,
 491                 .proc_handler   = &proc_dointvec,
 492         },
 493 #endif
 494 #ifdef CONFIG_BSD_PROCESS_ACCT
 495         {
 496                 .ctl_name       = KERN_ACCT,
 497                 .procname       = "acct",
 498                 .data           = &acct_parm,
 499                 .maxlen         = 3*sizeof(int),
 500                 .mode           = 0644,
 501                 .proc_handler   = &proc_dointvec,
 502         },
 503 #endif
 504 #ifdef CONFIG_MAGIC_SYSRQ
 505         {
 506                 .ctl_name       = KERN_SYSRQ,
 507                 .procname       = "sysrq",
 508                 .data           = &__sysrq_enabled,
 509                 .maxlen         = sizeof (int),
 510                 .mode           = 0644,
 511                 .proc_handler   = &proc_dointvec,
 512         },
 513 #endif
 514 #ifdef CONFIG_PROC_SYSCTL
 515         {
 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         {
 538                 .ctl_name       = KERN_OVERFLOWUID,
 539                 .procname       = "overflowuid",
 540                 .data           = &overflowuid,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = &proc_dointvec_minmax,
 544                 .strategy       = &sysctl_intvec,
 545                 .extra1         = &minolduid,
 546                 .extra2         = &maxolduid,
 547         },
 548         {
 549                 .ctl_name       = KERN_OVERFLOWGID,
 550                 .procname       = "overflowgid",
 551                 .data           = &overflowgid,
 552                 .maxlen         = sizeof(int),
 553                 .mode           = 0644,
 554                 .proc_handler   = &proc_dointvec_minmax,
 555                 .strategy       = &sysctl_intvec,
 556                 .extra1         = &minolduid,
 557                 .extra2         = &maxolduid,
 558         },
 559 #ifdef CONFIG_S390
 560 #ifdef CONFIG_MATHEMU
 561         {
 562                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 563                 .procname       = "ieee_emulation_warnings",
 564                 .data           = &sysctl_ieee_emulation_warnings,
 565                 .maxlen         = sizeof(int),
 566                 .mode           = 0644,
 567                 .proc_handler   = &proc_dointvec,
 568         },
 569 #endif
 570 #ifdef CONFIG_NO_IDLE_HZ
 571         {
 572                 .ctl_name       = KERN_HZ_TIMER,
 573                 .procname       = "hz_timer",
 574                 .data           = &sysctl_hz_timer,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec,
 578         },
 579 #endif
 580         {
 581                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 582                 .procname       = "userprocess_debug",
 583                 .data           = &sysctl_userprocess_debug,
 584                 .maxlen         = sizeof(int),
 585                 .mode           = 0644,
 586                 .proc_handler   = &proc_dointvec,
 587         },
 588 #endif
 589         {
 590                 .ctl_name       = KERN_PIDMAX,
 591                 .procname       = "pid_max",
 592                 .data           = &pid_max,
 593                 .maxlen         = sizeof (int),
 594                 .mode           = 0644,
 595                 .proc_handler   = &proc_dointvec_minmax,
 596                 .strategy       = sysctl_intvec,
 597                 .extra1         = &pid_max_min,
 598                 .extra2         = &pid_max_max,
 599         },
 600         {
 601                 .ctl_name       = KERN_PANIC_ON_OOPS,
 602                 .procname       = "panic_on_oops",
 603                 .data           = &panic_on_oops,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec,
 607         },
 608         {
 609                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 610                 .procname       = "printk_ratelimit",
 611                 .data           = &printk_ratelimit_jiffies,
 612                 .maxlen         = sizeof(int),
 613                 .mode           = 0644,
 614                 .proc_handler   = &proc_dointvec_jiffies,
 615                 .strategy       = &sysctl_jiffies,
 616         },
 617         {
 618                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 619                 .procname       = "printk_ratelimit_burst",
 620                 .data           = &printk_ratelimit_burst,
 621                 .maxlen         = sizeof(int),
 622                 .mode           = 0644,
 623                 .proc_handler   = &proc_dointvec,
 624         },
 625         {
 626                 .ctl_name       = KERN_NGROUPS_MAX,
 627                 .procname       = "ngroups_max",
 628                 .data           = &ngroups_max,
 629                 .maxlen         = sizeof (int),
 630                 .mode           = 0444,
 631                 .proc_handler   = &proc_dointvec,
 632         },
 633 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 634         {
 635                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 636                 .procname       = "unknown_nmi_panic",
 637                 .data           = &unknown_nmi_panic,
 638                 .maxlen         = sizeof (int),
 639                 .mode           = 0644,
 640                 .proc_handler   = &proc_dointvec,
 641         },
 642         {
 643                 .procname       = "nmi_watchdog",
 644                 .data           = &nmi_watchdog_enabled,
 645                 .maxlen         = sizeof (int),
 646                 .mode           = 0644,
 647                 .proc_handler   = &proc_nmi_enabled,
 648         },
 649 #endif
 650 #if defined(CONFIG_X86)
 651         {
 652                 .ctl_name       = KERN_PANIC_ON_NMI,
 653                 .procname       = "panic_on_unrecovered_nmi",
 654                 .data           = &panic_on_unrecovered_nmi,
 655                 .maxlen         = sizeof(int),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_dointvec,
 658         },
 659         {
 660                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 661                 .procname       = "bootloader_type",
 662                 .data           = &bootloader_type,
 663                 .maxlen         = sizeof (int),
 664                 .mode           = 0444,
 665                 .proc_handler   = &proc_dointvec,
 666         },
 667         {
 668                 .ctl_name       = CTL_UNNUMBERED,
 669                 .procname       = "kstack_depth_to_print",
 670                 .data           = &kstack_depth_to_print,
 671                 .maxlen         = sizeof(int),
 672                 .mode           = 0644,
 673                 .proc_handler   = &proc_dointvec,
 674         },
 675 #endif
 676 #if defined(CONFIG_MMU)
 677         {
 678                 .ctl_name       = KERN_RANDOMIZE,
 679                 .procname       = "randomize_va_space",
 680                 .data           = &randomize_va_space,
 681                 .maxlen         = sizeof(int),
 682                 .mode           = 0644,
 683                 .proc_handler   = &proc_dointvec,
 684         },
 685 #endif
 686 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 687         {
 688                 .ctl_name       = KERN_SPIN_RETRY,
 689                 .procname       = "spin_retry",
 690                 .data           = &spin_retry,
 691                 .maxlen         = sizeof (int),
 692                 .mode           = 0644,
 693                 .proc_handler   = &proc_dointvec,
 694         },
 695 #endif
 696 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 697         {
 698                 .procname       = "acpi_video_flags",
 699                 .data           = &acpi_realmode_flags,
 700                 .maxlen         = sizeof (unsigned long),
 701                 .mode           = 0644,
 702                 .proc_handler   = &proc_doulongvec_minmax,
 703         },
 704 #endif
 705 #ifdef CONFIG_IA64
 706         {
 707                 .ctl_name       = KERN_IA64_UNALIGNED,
 708                 .procname       = "ignore-unaligned-usertrap",
 709                 .data           = &no_unaligned_warning,
 710                 .maxlen         = sizeof (int),
 711                 .mode           = 0644,
 712                 .proc_handler   = &proc_dointvec,
 713         },
 714 #endif
 715 #ifdef CONFIG_DETECT_SOFTLOCKUP
 716         {
 717                 .ctl_name       = CTL_UNNUMBERED,
 718                 .procname       = "softlockup_thresh",
 719                 .data           = &softlockup_thresh,
 720                 .maxlen         = sizeof(int),
 721                 .mode           = 0644,
 722                 .proc_handler   = &proc_dointvec_minmax,
 723                 .strategy       = &sysctl_intvec,
 724                 .extra1         = &one,
 725                 .extra2         = &sixty,
 726         },
 727 #endif
 728 #ifdef CONFIG_COMPAT
 729         {
 730                 .ctl_name       = KERN_COMPAT_LOG,
 731                 .procname       = "compat-log",
 732                 .data           = &compat_log,
 733                 .maxlen         = sizeof (int),
 734                 .mode           = 0644,
 735                 .proc_handler   = &proc_dointvec,
 736         },
 737 #endif
 738 #ifdef CONFIG_RT_MUTEXES
 739         {
 740                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 741                 .procname       = "max_lock_depth",
 742                 .data           = &max_lock_depth,
 743                 .maxlen         = sizeof(int),
 744                 .mode           = 0644,
 745                 .proc_handler   = &proc_dointvec,
 746         },
 747 #endif
 748 #ifdef CONFIG_PROC_FS
 749         {
 750                 .ctl_name       = CTL_UNNUMBERED,
 751                 .procname       = "maps_protect",
 752                 .data           = &maps_protect,
 753                 .maxlen         = sizeof(int),
 754                 .mode           = 0644,
 755                 .proc_handler   = &proc_dointvec,
 756         },
 757 #endif
 758         {
 759                 .ctl_name       = CTL_UNNUMBERED,
 760                 .procname       = "poweroff_cmd",
 761                 .data           = &poweroff_cmd,
 762                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 763                 .mode           = 0644,
 764                 .proc_handler   = &proc_dostring,
 765                 .strategy       = &sysctl_string,
 766         },
 767 /*
 768  * NOTE: do not add new entries to this table unless you have read
 769  * Documentation/sysctl/ctl_unnumbered.txt
 770  */
 771         { .ctl_name = 0 }
 772 };
 773
 774 static struct ctl_table vm_table[] = {
 775         {
 776                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 777                 .procname       = "overcommit_memory",
 778                 .data           = &sysctl_overcommit_memory,
 779                 .maxlen         = sizeof(sysctl_overcommit_memory),
 780                 .mode           = 0644,
 781                 .proc_handler   = &proc_dointvec,
 782         },
 783         {
 784                 .ctl_name       = VM_PANIC_ON_OOM,
 785                 .procname       = "panic_on_oom",
 786                 .data           = &sysctl_panic_on_oom,
 787                 .maxlen         = sizeof(sysctl_panic_on_oom),
 788                 .mode           = 0644,
 789                 .proc_handler   = &proc_dointvec,
 790         },
 791         {
 792                 .ctl_name       = CTL_UNNUMBERED,
 793                 .procname       = "oom_kill_allocating_task",
 794                 .data           = &sysctl_oom_kill_allocating_task,
 795                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 796                 .mode           = 0644,
 797                 .proc_handler   = &proc_dointvec,
 798         },
 799         {
 800                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 801                 .procname       = "overcommit_ratio",
 802                 .data           = &sysctl_overcommit_ratio,
 803                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 804                 .mode           = 0644,
 805                 .proc_handler   = &proc_dointvec,
 806         },
 807         {
 808                 .ctl_name       = VM_PAGE_CLUSTER,
 809                 .procname       = "page-cluster",
 810                 .data           = &page_cluster,
 811                 .maxlen         = sizeof(int),
 812                 .mode           = 0644,
 813                 .proc_handler   = &proc_dointvec,
 814         },
 815         {
 816                 .ctl_name       = VM_DIRTY_BACKGROUND,
 817                 .procname       = "dirty_background_ratio",
 818                 .data           = &dirty_background_ratio,
 819                 .maxlen         = sizeof(dirty_background_ratio),
 820                 .mode           = 0644,
 821                 .proc_handler   = &proc_dointvec_minmax,
 822                 .strategy       = &sysctl_intvec,
 823                 .extra1         = &zero,
 824                 .extra2         = &one_hundred,
 825         },
 826         {
 827                 .ctl_name       = VM_DIRTY_RATIO,
 828                 .procname       = "dirty_ratio",
 829                 .data           = &vm_dirty_ratio,
 830                 .maxlen         = sizeof(vm_dirty_ratio),
 831                 .mode           = 0644,
 832                 .proc_handler   = &dirty_ratio_handler,
 833                 .strategy       = &sysctl_intvec,
 834                 .extra1         = &zero,
 835                 .extra2         = &one_hundred,
 836         },
 837         {
 838                 .procname       = "dirty_writeback_centisecs",
 839                 .data           = &dirty_writeback_interval,
 840                 .maxlen         = sizeof(dirty_writeback_interval),
 841                 .mode           = 0644,
 842                 .proc_handler   = &dirty_writeback_centisecs_handler,
 843         },
 844         {
 845                 .procname       = "dirty_expire_centisecs",
 846                 .data           = &dirty_expire_interval,
 847                 .maxlen         = sizeof(dirty_expire_interval),
 848                 .mode           = 0644,
 849                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 850         },
 851         {
 852                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 853                 .procname       = "nr_pdflush_threads",
 854                 .data           = &nr_pdflush_threads,
 855                 .maxlen         = sizeof nr_pdflush_threads,
 856                 .mode           = 0444 /* read-only*/,
 857                 .proc_handler   = &proc_dointvec,
 858         },
 859         {
 860                 .ctl_name       = VM_SWAPPINESS,
 861                 .procname       = "swappiness",
 862                 .data           = &vm_swappiness,
 863                 .maxlen         = sizeof(vm_swappiness),
 864                 .mode           = 0644,
 865                 .proc_handler   = &proc_dointvec_minmax,
 866                 .strategy       = &sysctl_intvec,
 867                 .extra1         = &zero,
 868                 .extra2         = &one_hundred,
 869         },
 870 #ifdef CONFIG_HUGETLB_PAGE
 871          {
 872                 .procname       = "nr_hugepages",
 873                 .data           = &max_huge_pages,
 874                 .maxlen         = sizeof(unsigned long),
 875                 .mode           = 0644,
 876                 .proc_handler   = &hugetlb_sysctl_handler,
 877                 .extra1         = (void *)&hugetlb_zero,
 878                 .extra2         = (void *)&hugetlb_infinity,
 879          },
 880          {
 881                 .ctl_name       = VM_HUGETLB_GROUP,
 882                 .procname       = "hugetlb_shm_group",
 883                 .data           = &sysctl_hugetlb_shm_group,
 884                 .maxlen         = sizeof(gid_t),
 885                 .mode           = 0644,
 886                 .proc_handler   = &proc_dointvec,
 887          },
 888          {
 889                 .ctl_name       = CTL_UNNUMBERED,
 890                 .procname       = "hugepages_treat_as_movable",
 891                 .data           = &hugepages_treat_as_movable,
 892                 .maxlen         = sizeof(int),
 893                 .mode           = 0644,
 894                 .proc_handler   = &hugetlb_treat_movable_handler,
 895         },
 896         {
 897                 .ctl_name       = CTL_UNNUMBERED,
 898                 .procname       = "hugetlb_dynamic_pool",
 899                 .data           = &hugetlb_dynamic_pool,
 900                 .maxlen         = sizeof(hugetlb_dynamic_pool),
 901                 .mode           = 0644,
 902                 .proc_handler   = &proc_dointvec,
 903         },
 904 #endif
 905         {
 906                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 907                 .procname       = "lowmem_reserve_ratio",
 908                 .data           = &sysctl_lowmem_reserve_ratio,
 909                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 910                 .mode           = 0644,
 911                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 912                 .strategy       = &sysctl_intvec,
 913         },
 914         {
 915                 .ctl_name       = VM_DROP_PAGECACHE,
 916                 .procname       = "drop_caches",
 917                 .data           = &sysctl_drop_caches,
 918                 .maxlen         = sizeof(int),
 919                 .mode           = 0644,
 920                 .proc_handler   = drop_caches_sysctl_handler,
 921                 .strategy       = &sysctl_intvec,
 922         },
 923         {
 924                 .ctl_name       = VM_MIN_FREE_KBYTES,
 925                 .procname       = "min_free_kbytes",
 926                 .data           = &min_free_kbytes,
 927                 .maxlen         = sizeof(min_free_kbytes),
 928                 .mode           = 0644,
 929                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 930                 .strategy       = &sysctl_intvec,
 931                 .extra1         = &zero,
 932         },
 933         {
 934                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 935                 .procname       = "percpu_pagelist_fraction",
 936                 .data           = &percpu_pagelist_fraction,
 937                 .maxlen         = sizeof(percpu_pagelist_fraction),
 938                 .mode           = 0644,
 939                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 940                 .strategy       = &sysctl_intvec,
 941                 .extra1         = &min_percpu_pagelist_fract,
 942         },
 943 #ifdef CONFIG_MMU
 944         {
 945                 .ctl_name       = VM_MAX_MAP_COUNT,
 946                 .procname       = "max_map_count",
 947                 .data           = &sysctl_max_map_count,
 948                 .maxlen         = sizeof(sysctl_max_map_count),
 949                 .mode           = 0644,
 950                 .proc_handler   = &proc_dointvec
 951         },
 952 #endif
 953         {
 954                 .ctl_name       = VM_LAPTOP_MODE,
 955                 .procname       = "laptop_mode",
 956                 .data           = &laptop_mode,
 957                 .maxlen         = sizeof(laptop_mode),
 958                 .mode           = 0644,
 959                 .proc_handler   = &proc_dointvec_jiffies,
 960                 .strategy       = &sysctl_jiffies,
 961         },
 962         {
 963                 .ctl_name       = VM_BLOCK_DUMP,
 964                 .procname       = "block_dump",
 965                 .data           = &block_dump,
 966                 .maxlen         = sizeof(block_dump),
 967                 .mode           = 0644,
 968                 .proc_handler   = &proc_dointvec,
 969                 .strategy       = &sysctl_intvec,
 970                 .extra1         = &zero,
 971         },
 972         {
 973                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 974                 .procname       = "vfs_cache_pressure",
 975                 .data           = &sysctl_vfs_cache_pressure,
 976                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 977                 .mode           = 0644,
 978                 .proc_handler   = &proc_dointvec,
 979                 .strategy       = &sysctl_intvec,
 980                 .extra1         = &zero,
 981         },
 982 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 983         {
 984                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 985                 .procname       = "legacy_va_layout",
 986                 .data           = &sysctl_legacy_va_layout,
 987                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 988                 .mode           = 0644,
 989                 .proc_handler   = &proc_dointvec,
 990                 .strategy       = &sysctl_intvec,
 991                 .extra1         = &zero,
 992         },
 993 #endif
 994 #ifdef CONFIG_NUMA
 995         {
 996                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
 997                 .procname       = "zone_reclaim_mode",
 998                 .data           = &zone_reclaim_mode,
 999                 .maxlen         = sizeof(zone_reclaim_mode),
1000                 .mode           = 0644,
1001                 .proc_handler   = &proc_dointvec,
1002                 .strategy       = &sysctl_intvec,
1003                 .extra1         = &zero,
1004         },
1005         {
1006                 .ctl_name       = VM_MIN_UNMAPPED,
1007                 .procname       = "min_unmapped_ratio",
1008                 .data           = &sysctl_min_unmapped_ratio,
1009                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1010                 .mode           = 0644,
1011                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1012                 .strategy       = &sysctl_intvec,
1013                 .extra1         = &zero,
1014                 .extra2         = &one_hundred,
1015         },
1016         {
1017                 .ctl_name       = VM_MIN_SLAB,
1018                 .procname       = "min_slab_ratio",
1019                 .data           = &sysctl_min_slab_ratio,
1020                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1021                 .mode           = 0644,
1022                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1023                 .strategy       = &sysctl_intvec,
1024                 .extra1         = &zero,
1025                 .extra2         = &one_hundred,
1026         },
1027 #endif
1028 #ifdef CONFIG_SMP
1029         {
1030                 .ctl_name       = CTL_UNNUMBERED,
1031                 .procname       = "stat_interval",
1032                 .data           = &sysctl_stat_interval,
1033                 .maxlen         = sizeof(sysctl_stat_interval),
1034                 .mode           = 0644,
1035                 .proc_handler   = &proc_dointvec_jiffies,
1036                 .strategy       = &sysctl_jiffies,
1037         },
1038 #endif
1039 #ifdef CONFIG_SECURITY
1040         {
1041                 .ctl_name       = CTL_UNNUMBERED,
1042                 .procname       = "mmap_min_addr",
1043                 .data           = &mmap_min_addr,
1044                 .maxlen         = sizeof(unsigned long),
1045                 .mode           = 0644,
1046                 .proc_handler   = &proc_doulongvec_minmax,
1047         },
1048 #endif
1049 #ifdef CONFIG_NUMA
1050         {
1051                 .ctl_name       = CTL_UNNUMBERED,
1052                 .procname       = "numa_zonelist_order",
1053                 .data           = &numa_zonelist_order,
1054                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1055                 .mode           = 0644,
1056                 .proc_handler   = &numa_zonelist_order_handler,
1057                 .strategy       = &sysctl_string,
1058         },
1059 #endif
1060 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1061    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1062         {
1063                 .ctl_name       = VM_VDSO_ENABLED,
1064                 .procname       = "vdso_enabled",
1065                 .data           = &vdso_enabled,
1066                 .maxlen         = sizeof(vdso_enabled),
1067                 .mode           = 0644,
1068                 .proc_handler   = &proc_dointvec,
1069                 .strategy       = &sysctl_intvec,
1070                 .extra1         = &zero,
1071         },
1072 #endif
1073 /*
1074  * NOTE: do not add new entries to this table unless you have read
1075  * Documentation/sysctl/ctl_unnumbered.txt
1076  */
1077         { .ctl_name = 0 }
1078 };
1079
1080 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1081 static struct ctl_table binfmt_misc_table[] = {
1082         { .ctl_name = 0 }
1083 };
1084 #endif
1085
1086 static struct ctl_table fs_table[] = {
1087         {
1088                 .ctl_name       = FS_NRINODE,
1089                 .procname       = "inode-nr",
1090                 .data           = &inodes_stat,
1091                 .maxlen         = 2*sizeof(int),
1092                 .mode           = 0444,
1093                 .proc_handler   = &proc_dointvec,
1094         },
1095         {
1096                 .ctl_name       = FS_STATINODE,
1097                 .procname       = "inode-state",
1098                 .data           = &inodes_stat,
1099                 .maxlen         = 7*sizeof(int),
1100                 .mode           = 0444,
1101                 .proc_handler   = &proc_dointvec,
1102         },
1103         {
1104                 .procname       = "file-nr",
1105                 .data           = &files_stat,
1106                 .maxlen         = 3*sizeof(int),
1107                 .mode           = 0444,
1108                 .proc_handler   = &proc_nr_files,
1109         },
1110         {
1111                 .ctl_name       = FS_MAXFILE,
1112                 .procname       = "file-max",
1113                 .data           = &files_stat.max_files,
1114                 .maxlen         = sizeof(int),
1115                 .mode           = 0644,
1116                 .proc_handler   = &proc_dointvec,
1117         },
1118         {
1119                 .ctl_name       = FS_DENTRY,
1120                 .procname       = "dentry-state",
1121                 .data           = &dentry_stat,
1122                 .maxlen         = 6*sizeof(int),
1123                 .mode           = 0444,
1124                 .proc_handler   = &proc_dointvec,
1125         },
1126         {
1127                 .ctl_name       = FS_OVERFLOWUID,
1128                 .procname       = "overflowuid",
1129                 .data           = &fs_overflowuid,
1130                 .maxlen         = sizeof(int),
1131                 .mode           = 0644,
1132                 .proc_handler   = &proc_dointvec_minmax,
1133                 .strategy       = &sysctl_intvec,
1134                 .extra1         = &minolduid,
1135                 .extra2         = &maxolduid,
1136         },
1137         {
1138                 .ctl_name       = FS_OVERFLOWGID,
1139                 .procname       = "overflowgid",
1140                 .data           = &fs_overflowgid,
1141                 .maxlen         = sizeof(int),
1142                 .mode           = 0644,
1143                 .proc_handler   = &proc_dointvec_minmax,
1144                 .strategy       = &sysctl_intvec,
1145                 .extra1         = &minolduid,
1146                 .extra2         = &maxolduid,
1147         },
1148         {
1149                 .ctl_name       = FS_LEASES,
1150                 .procname       = "leases-enable",
1151                 .data           = &leases_enable,
1152                 .maxlen         = sizeof(int),
1153                 .mode           = 0644,
1154                 .proc_handler   = &proc_dointvec,
1155         },
1156 #ifdef CONFIG_DNOTIFY
1157         {
1158                 .ctl_name       = FS_DIR_NOTIFY,
1159                 .procname       = "dir-notify-enable",
1160                 .data           = &dir_notify_enable,
1161                 .maxlen         = sizeof(int),
1162                 .mode           = 0644,
1163                 .proc_handler   = &proc_dointvec,
1164         },
1165 #endif
1166 #ifdef CONFIG_MMU
1167         {
1168                 .ctl_name       = FS_LEASE_TIME,
1169                 .procname       = "lease-break-time",
1170                 .data           = &lease_break_time,
1171                 .maxlen         = sizeof(int),
1172                 .mode           = 0644,
1173                 .proc_handler   = &proc_dointvec_minmax,
1174                 .strategy       = &sysctl_intvec,
1175                 .extra1         = &zero,
1176                 .extra2         = &two,
1177         },
1178         {
1179                 .procname       = "aio-nr",
1180                 .data           = &aio_nr,
1181                 .maxlen         = sizeof(aio_nr),
1182                 .mode           = 0444,
1183                 .proc_handler   = &proc_doulongvec_minmax,
1184         },
1185         {
1186                 .procname       = "aio-max-nr",
1187                 .data           = &aio_max_nr,
1188                 .maxlen         = sizeof(aio_max_nr),
1189                 .mode           = 0644,
1190                 .proc_handler   = &proc_doulongvec_minmax,
1191         },
1192 #ifdef CONFIG_INOTIFY_USER
1193         {
1194                 .ctl_name       = FS_INOTIFY,
1195                 .procname       = "inotify",
1196                 .mode           = 0555,
1197                 .child          = inotify_table,
1198         },
1199 #endif
1200 #endif
1201         {
1202                 .ctl_name       = KERN_SETUID_DUMPABLE,
1203                 .procname       = "suid_dumpable",
1204                 .data           = &suid_dumpable,
1205                 .maxlen         = sizeof(int),
1206                 .mode           = 0644,
1207                 .proc_handler   = &proc_dointvec,
1208         },
1209 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1210         {
1211                 .ctl_name       = CTL_UNNUMBERED,
1212                 .procname       = "binfmt_misc",
1213                 .mode           = 0555,
1214                 .child          = binfmt_misc_table,
1215         },
1216 #endif
1217 /*
1218  * NOTE: do not add new entries to this table unless you have read
1219  * Documentation/sysctl/ctl_unnumbered.txt
1220  */
1221         { .ctl_name = 0 }
1222 };
1223
1224 static struct ctl_table debug_table[] = {
1225 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1226         {
1227                 .ctl_name       = CTL_UNNUMBERED,
1228                 .procname       = "exception-trace",
1229                 .data           = &show_unhandled_signals,
1230                 .maxlen         = sizeof(int),
1231                 .mode           = 0644,
1232                 .proc_handler   = proc_dointvec
1233         },
1234 #endif
1235         { .ctl_name = 0 }
1236 };
1237
1238 static struct ctl_table dev_table[] = {
1239         { .ctl_name = 0 }
1240 };
1241
1242 static DEFINE_SPINLOCK(sysctl_lock);
1243
1244 /* called under sysctl_lock */
1245 static int use_table(struct ctl_table_header *p)
1246 {
1247         if (unlikely(p->unregistering))
1248                 return 0;
1249         p->used++;
1250         return 1;
1251 }
1252
1253 /* called under sysctl_lock */
1254 static void unuse_table(struct ctl_table_header *p)
1255 {
1256         if (!--p->used)
1257                 if (unlikely(p->unregistering))
1258                         complete(p->unregistering);
1259 }
1260
1261 /* called under sysctl_lock, will reacquire if has to wait */
1262 static void start_unregistering(struct ctl_table_header *p)
1263 {
1264         /*
1265          * if p->used is 0, nobody will ever touch that entry again;
1266          * we'll eliminate all paths to it before dropping sysctl_lock
1267          */
1268         if (unlikely(p->used)) {
1269                 struct completion wait;
1270                 init_completion(&wait);
1271                 p->unregistering = &wait;
1272                 spin_unlock(&sysctl_lock);
1273                 wait_for_completion(&wait);
1274                 spin_lock(&sysctl_lock);
1275         }
1276         /*
1277          * do not remove from the list until nobody holds it; walking the
1278          * list in do_sysctl() relies on that.
1279          */
1280         list_del_init(&p->ctl_entry);
1281 }
1282
1283 void sysctl_head_finish(struct ctl_table_header *head)
1284 {
1285         if (!head)
1286                 return;
1287         spin_lock(&sysctl_lock);
1288         unuse_table(head);
1289         spin_unlock(&sysctl_lock);
1290 }
1291
1292 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1293 {
1294         struct ctl_table_header *head;
1295         struct list_head *tmp;
1296         spin_lock(&sysctl_lock);
1297         if (prev) {
1298                 tmp = &prev->ctl_entry;
1299                 unuse_table(prev);
1300                 goto next;
1301         }
1302         tmp = &root_table_header.ctl_entry;
1303         for (;;) {
1304                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1305
1306                 if (!use_table(head))
1307                         goto next;
1308                 spin_unlock(&sysctl_lock);
1309                 return head;
1310         next:
1311                 tmp = tmp->next;
1312                 if (tmp == &root_table_header.ctl_entry)
1313                         break;
1314         }
1315         spin_unlock(&sysctl_lock);
1316         return NULL;
1317 }
1318
1319 #ifdef CONFIG_SYSCTL_SYSCALL
1320 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1321                void __user *newval, size_t newlen)
1322 {
1323         struct ctl_table_header *head;
1324         int error = -ENOTDIR;
1325
1326         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1327                 return -ENOTDIR;
1328         if (oldval) {
1329                 int old_len;
1330                 if (!oldlenp || get_user(old_len, oldlenp))
1331                         return -EFAULT;
1332         }
1333
1334         for (head = sysctl_head_next(NULL); head;
1335                         head = sysctl_head_next(head)) {
1336                 error = parse_table(name, nlen, oldval, oldlenp,
1337                                         newval, newlen, head->ctl_table);
1338                 if (error != -ENOTDIR) {
1339                         sysctl_head_finish(head);
1340                         break;
1341                 }
1342         }
1343         return error;
1344 }
1345
1346 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1347 {
1348         struct __sysctl_args tmp;
1349         int error;
1350
1351         if (copy_from_user(&tmp, args, sizeof(tmp)))
1352                 return -EFAULT;
1353
1354         error = deprecated_sysctl_warning(&tmp);
1355         if (error)
1356                 goto out;
1357
1358         lock_kernel();
1359         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1360                           tmp.newval, tmp.newlen);
1361         unlock_kernel();
1362 out:
1363         return error;
1364 }
1365 #endif /* CONFIG_SYSCTL_SYSCALL */
1366
1367 /*
1368  * sysctl_perm does NOT grant the superuser all rights automatically, because
1369  * some sysctl variables are readonly even to root.
1370  */
1371
1372 static int test_perm(int mode, int op)
1373 {
1374         if (!current->euid)
1375                 mode >>= 6;
1376         else if (in_egroup_p(0))
1377                 mode >>= 3;
1378         if ((mode & op & 0007) == op)
1379                 return 0;
1380         return -EACCES;
1381 }
1382
1383 int sysctl_perm(struct ctl_table *table, int op)
1384 {
1385         int error;
1386         error = security_sysctl(table, op);
1387         if (error)
1388                 return error;
1389         return test_perm(table->mode, op);
1390 }
1391
1392 #ifdef CONFIG_SYSCTL_SYSCALL
1393 static int parse_table(int __user *name, int nlen,
1394                        void __user *oldval, size_t __user *oldlenp,
1395                        void __user *newval, size_t newlen,
1396                        struct ctl_table *table)
1397 {
1398         int n;
1399 repeat:
1400         if (!nlen)
1401                 return -ENOTDIR;
1402         if (get_user(n, name))
1403                 return -EFAULT;
1404         for ( ; table->ctl_name || table->procname; table++) {
1405                 if (!table->ctl_name)
1406                         continue;
1407                 if (n == table->ctl_name) {
1408                         int error;
1409                         if (table->child) {
1410                                 if (sysctl_perm(table, 001))
1411                                         return -EPERM;
1412                                 name++;
1413                                 nlen--;
1414                                 table = table->child;
1415                                 goto repeat;
1416                         }
1417                         error = do_sysctl_strategy(table, name, nlen,
1418                                                    oldval, oldlenp,
1419                                                    newval, newlen);
1420                         return error;
1421                 }
1422         }
1423         return -ENOTDIR;
1424 }
1425
1426 /* Perform the actual read/write of a sysctl table entry. */
1427 int do_sysctl_strategy (struct ctl_table *table,
1428                         int __user *name, int nlen,
1429                         void __user *oldval, size_t __user *oldlenp,
1430                         void __user *newval, size_t newlen)
1431 {
1432         int op = 0, rc;
1433
1434         if (oldval)
1435                 op |= 004;
1436         if (newval)
1437                 op |= 002;
1438         if (sysctl_perm(table, op))
1439                 return -EPERM;
1440
1441         if (table->strategy) {
1442                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1443                                      newval, newlen);
1444                 if (rc < 0)
1445                         return rc;
1446                 if (rc > 0)
1447                         return 0;
1448         }
1449
1450         /* If there is no strategy routine, or if the strategy returns
1451          * zero, proceed with automatic r/w */
1452         if (table->data && table->maxlen) {
1453                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1454                                  newval, newlen);
1455                 if (rc < 0)
1456                         return rc;
1457         }
1458         return 0;
1459 }
1460 #endif /* CONFIG_SYSCTL_SYSCALL */
1461
1462 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1463 {
1464         for (; table->ctl_name || table->procname; table++) {
1465                 table->parent = parent;
1466                 if (table->child)
1467                         sysctl_set_parent(table, table->child);
1468         }
1469 }
1470
1471 static __init int sysctl_init(void)
1472 {
1473         int err;
1474         sysctl_set_parent(NULL, root_table);
1475         err = sysctl_check_table(root_table);
1476         return 0;
1477 }
1478
1479 core_initcall(sysctl_init);
1480
1481 /**
1482  * register_sysctl_table - register a sysctl hierarchy
1483  * @table: the top-level table structure
1484  *
1485  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1486  * array. An entry with a ctl_name of 0 terminates the table.
1487  *
1488  * The members of the &struct ctl_table structure are used as follows:
1489  *
1490  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1491  *            must be unique within that level of sysctl
1492  *
1493  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1494  *            enter a sysctl file
1495  *
1496  * data - a pointer to data for use by proc_handler
1497  *
1498  * maxlen - the maximum size in bytes of the data
1499  *
1500  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1501  *
1502  * child - a pointer to the child sysctl table if this entry is a directory, or
1503  *         %NULL.
1504  *
1505  * proc_handler - the text handler routine (described below)
1506  *
1507  * strategy - the strategy routine (described below)
1508  *
1509  * de - for internal use by the sysctl routines
1510  *
1511  * extra1, extra2 - extra pointers usable by the proc handler routines
1512  *
1513  * Leaf nodes in the sysctl tree will be represented by a single file
1514  * under /proc; non-leaf nodes will be represented by directories.
1515  *
1516  * sysctl(2) can automatically manage read and write requests through
1517  * the sysctl table.  The data and maxlen fields of the ctl_table
1518  * struct enable minimal validation of the values being written to be
1519  * performed, and the mode field allows minimal authentication.
1520  *
1521  * More sophisticated management can be enabled by the provision of a
1522  * strategy routine with the table entry.  This will be called before
1523  * any automatic read or write of the data is performed.
1524  *
1525  * The strategy routine may return
1526  *
1527  * < 0 - Error occurred (error is passed to user process)
1528  *
1529  * 0   - OK - proceed with automatic read or write.
1530  *
1531  * > 0 - OK - read or write has been done by the strategy routine, so
1532  *       return immediately.
1533  *
1534  * There must be a proc_handler routine for any terminal nodes
1535  * mirrored under /proc/sys (non-terminals are handled by a built-in
1536  * directory handler).  Several default handlers are available to
1537  * cover common cases -
1538  *
1539  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1540  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1541  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1542  *
1543  * It is the handler's job to read the input buffer from user memory
1544  * and process it. The handler should return 0 on success.
1545  *
1546  * This routine returns %NULL on a failure to register, and a pointer
1547  * to the table header on success.
1548  */
1549 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1550 {
1551         struct ctl_table_header *tmp;
1552         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1553         if (!tmp)
1554                 return NULL;
1555         tmp->ctl_table = table;
1556         INIT_LIST_HEAD(&tmp->ctl_entry);
1557         tmp->used = 0;
1558         tmp->unregistering = NULL;
1559         sysctl_set_parent(NULL, table);
1560         if (sysctl_check_table(tmp->ctl_table)) {
1561                 kfree(tmp);
1562                 return NULL;
1563         }
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 #ifdef CONFIG_SECURITY_CAPABILITIES
1878 /*
1879  *      init may raise the set.
1880  */
1881
1882 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
1883                         void __user *buffer, size_t *lenp, loff_t *ppos)
1884 {
1885         int op;
1886
1887         if (write && !capable(CAP_SYS_MODULE)) {
1888                 return -EPERM;
1889         }
1890
1891         op = is_init(current) ? OP_SET : OP_AND;
1892         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1893                                 do_proc_dointvec_bset_conv,&op);
1894 }
1895 #endif /* def CONFIG_SECURITY_CAPABILITIES */
1896
1897 /*
1898  *      Taint values can only be increased
1899  */
1900 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
1901                                void __user *buffer, size_t *lenp, loff_t *ppos)
1902 {
1903         int op;
1904
1905         if (write && !capable(CAP_SYS_ADMIN))
1906                 return -EPERM;
1907
1908         op = OP_OR;
1909         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1910                                 do_proc_dointvec_bset_conv,&op);
1911 }
1912
1913 struct do_proc_dointvec_minmax_conv_param {
1914         int *min;
1915         int *max;
1916 };
1917
1918 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1919                                         int *valp,
1920                                         int write, void *data)
1921 {
1922         struct do_proc_dointvec_minmax_conv_param *param = data;
1923         if (write) {
1924                 int val = *negp ? -*lvalp : *lvalp;
1925                 if ((param->min && *param->min > val) ||
1926                     (param->max && *param->max < val))
1927                         return -EINVAL;
1928                 *valp = val;
1929         } else {
1930                 int val = *valp;
1931                 if (val < 0) {
1932                         *negp = -1;
1933                         *lvalp = (unsigned long)-val;
1934                 } else {
1935                         *negp = 0;
1936                         *lvalp = (unsigned long)val;
1937                 }
1938         }
1939         return 0;
1940 }
1941
1942 /**
1943  * proc_dointvec_minmax - read a vector of integers with min/max values
1944  * @table: the sysctl table
1945  * @write: %TRUE if this is a write to the sysctl file
1946  * @filp: the file structure
1947  * @buffer: the user buffer
1948  * @lenp: the size of the user buffer
1949  * @ppos: file position
1950  *
1951  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1952  * values from/to the user buffer, treated as an ASCII string.
1953  *
1954  * This routine will ensure the values are within the range specified by
1955  * table->extra1 (min) and table->extra2 (max).
1956  *
1957  * Returns 0 on success.
1958  */
1959 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1960                   void __user *buffer, size_t *lenp, loff_t *ppos)
1961 {
1962         struct do_proc_dointvec_minmax_conv_param param = {
1963                 .min = (int *) table->extra1,
1964                 .max = (int *) table->extra2,
1965         };
1966         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1967                                 do_proc_dointvec_minmax_conv, &param);
1968 }
1969
1970 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1971                                      struct file *filp,
1972                                      void __user *buffer,
1973                                      size_t *lenp, loff_t *ppos,
1974                                      unsigned long convmul,
1975                                      unsigned long convdiv)
1976 {
1977 #define TMPBUFLEN 21
1978         unsigned long *i, *min, *max, val;
1979         int vleft, first=1, neg;
1980         size_t len, left;
1981         char buf[TMPBUFLEN], *p;
1982         char __user *s = buffer;
1983
1984         if (!data || !table->maxlen || !*lenp ||
1985             (*ppos && !write)) {
1986                 *lenp = 0;
1987                 return 0;
1988         }
1989
1990         i = (unsigned long *) data;
1991         min = (unsigned long *) table->extra1;
1992         max = (unsigned long *) table->extra2;
1993         vleft = table->maxlen / sizeof(unsigned long);
1994         left = *lenp;
1995
1996         for (; left && vleft--; i++, min++, max++, first=0) {
1997                 if (write) {
1998                         while (left) {
1999                                 char c;
2000                                 if (get_user(c, s))
2001                                         return -EFAULT;
2002                                 if (!isspace(c))
2003                                         break;
2004                                 left--;
2005                                 s++;
2006                         }
2007                         if (!left)
2008                                 break;
2009                         neg = 0;
2010                         len = left;
2011                         if (len > TMPBUFLEN-1)
2012                                 len = TMPBUFLEN-1;
2013                         if (copy_from_user(buf, s, len))
2014                                 return -EFAULT;
2015                         buf[len] = 0;
2016                         p = buf;
2017                         if (*p == '-' && left > 1) {
2018                                 neg = 1;
2019                                 p++;
2020                         }
2021                         if (*p < '0' || *p > '9')
2022                                 break;
2023                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2024                         len = p-buf;
2025                         if ((len < left) && *p && !isspace(*p))
2026                                 break;
2027                         if (neg)
2028                                 val = -val;
2029                         s += len;
2030                         left -= len;
2031
2032                         if(neg)
2033                                 continue;
2034                         if ((min && val < *min) || (max && val > *max))
2035                                 continue;
2036                         *i = val;
2037                 } else {
2038                         p = buf;
2039                         if (!first)
2040                                 *p++ = '\t';
2041                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2042                         len = strlen(buf);
2043                         if (len > left)
2044                                 len = left;
2045                         if(copy_to_user(s, buf, len))
2046                                 return -EFAULT;
2047                         left -= len;
2048                         s += len;
2049                 }
2050         }
2051
2052         if (!write && !first && left) {
2053                 if(put_user('\n', s))
2054                         return -EFAULT;
2055                 left--, s++;
2056         }
2057         if (write) {
2058                 while (left) {
2059                         char c;
2060                         if (get_user(c, s++))
2061                                 return -EFAULT;
2062                         if (!isspace(c))
2063                                 break;
2064                         left--;
2065                 }
2066         }
2067         if (write && first)
2068                 return -EINVAL;
2069         *lenp -= left;
2070         *ppos += *lenp;
2071         return 0;
2072 #undef TMPBUFLEN
2073 }
2074
2075 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2076                                      struct file *filp,
2077                                      void __user *buffer,
2078                                      size_t *lenp, loff_t *ppos,
2079                                      unsigned long convmul,
2080                                      unsigned long convdiv)
2081 {
2082         return __do_proc_doulongvec_minmax(table->data, table, write,
2083                         filp, buffer, lenp, ppos, convmul, convdiv);
2084 }
2085
2086 /**
2087  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2088  * @table: the sysctl table
2089  * @write: %TRUE if this is a write to the sysctl file
2090  * @filp: the file structure
2091  * @buffer: the user buffer
2092  * @lenp: the size of the user buffer
2093  * @ppos: file position
2094  *
2095  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2096  * values from/to the user buffer, treated as an ASCII string.
2097  *
2098  * This routine will ensure the values are within the range specified by
2099  * table->extra1 (min) and table->extra2 (max).
2100  *
2101  * Returns 0 on success.
2102  */
2103 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2104                            void __user *buffer, size_t *lenp, loff_t *ppos)
2105 {
2106     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2107 }
2108
2109 /**
2110  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2111  * @table: the sysctl table
2112  * @write: %TRUE if this is a write to the sysctl file
2113  * @filp: the file structure
2114  * @buffer: the user buffer
2115  * @lenp: the size of the user buffer
2116  * @ppos: file position
2117  *
2118  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2119  * values from/to the user buffer, treated as an ASCII string. The values
2120  * are treated as milliseconds, and converted to jiffies when they are stored.
2121  *
2122  * This routine will ensure the values are within the range specified by
2123  * table->extra1 (min) and table->extra2 (max).
2124  *
2125  * Returns 0 on success.
2126  */
2127 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2128                                       struct file *filp,
2129                                       void __user *buffer,
2130                                       size_t *lenp, loff_t *ppos)
2131 {
2132     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2133                                      lenp, ppos, HZ, 1000l);
2134 }
2135
2136
2137 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2138                                          int *valp,
2139                                          int write, void *data)
2140 {
2141         if (write) {
2142                 if (*lvalp > LONG_MAX / HZ)
2143                         return 1;
2144                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2145         } else {
2146                 int val = *valp;
2147                 unsigned long lval;
2148                 if (val < 0) {
2149                         *negp = -1;
2150                         lval = (unsigned long)-val;
2151                 } else {
2152                         *negp = 0;
2153                         lval = (unsigned long)val;
2154                 }
2155                 *lvalp = lval / HZ;
2156         }
2157         return 0;
2158 }
2159
2160 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2161                                                 int *valp,
2162                                                 int write, void *data)
2163 {
2164         if (write) {
2165                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2166                         return 1;
2167                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2168         } else {
2169                 int val = *valp;
2170                 unsigned long lval;
2171                 if (val < 0) {
2172                         *negp = -1;
2173                         lval = (unsigned long)-val;
2174                 } else {
2175                         *negp = 0;
2176                         lval = (unsigned long)val;
2177                 }
2178                 *lvalp = jiffies_to_clock_t(lval);
2179         }
2180         return 0;
2181 }
2182
2183 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2184                                             int *valp,
2185                                             int write, void *data)
2186 {
2187         if (write) {
2188                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2189         } else {
2190                 int val = *valp;
2191                 unsigned long lval;
2192                 if (val < 0) {
2193                         *negp = -1;
2194                         lval = (unsigned long)-val;
2195                 } else {
2196                         *negp = 0;
2197                         lval = (unsigned long)val;
2198                 }
2199                 *lvalp = jiffies_to_msecs(lval);
2200         }
2201         return 0;
2202 }
2203
2204 /**
2205  * proc_dointvec_jiffies - read a vector of integers as seconds
2206  * @table: the sysctl table
2207  * @write: %TRUE if this is a write to the sysctl file
2208  * @filp: the file structure
2209  * @buffer: the user buffer
2210  * @lenp: the size of the user buffer
2211  * @ppos: file position
2212  *
2213  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2214  * values from/to the user buffer, treated as an ASCII string.
2215  * The values read are assumed to be in seconds, and are converted into
2216  * jiffies.
2217  *
2218  * Returns 0 on success.
2219  */
2220 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2221                           void __user *buffer, size_t *lenp, loff_t *ppos)
2222 {
2223     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2224                             do_proc_dointvec_jiffies_conv,NULL);
2225 }
2226
2227 /**
2228  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2229  * @table: the sysctl table
2230  * @write: %TRUE if this is a write to the sysctl file
2231  * @filp: the file structure
2232  * @buffer: the user buffer
2233  * @lenp: the size of the user buffer
2234  * @ppos: pointer to the file position
2235  *
2236  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2237  * values from/to the user buffer, treated as an ASCII string.
2238  * The values read are assumed to be in 1/USER_HZ seconds, and
2239  * are converted into jiffies.
2240  *
2241  * Returns 0 on success.
2242  */
2243 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2244                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2245 {
2246     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2247                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2248 }
2249
2250 /**
2251  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2252  * @table: the sysctl table
2253  * @write: %TRUE if this is a write to the sysctl file
2254  * @filp: the file structure
2255  * @buffer: the user buffer
2256  * @lenp: the size of the user buffer
2257  * @ppos: file position
2258  * @ppos: the current position in the file
2259  *
2260  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2261  * values from/to the user buffer, treated as an ASCII string.
2262  * The values read are assumed to be in 1/1000 seconds, and
2263  * are converted into jiffies.
2264  *
2265  * Returns 0 on success.
2266  */
2267 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2268                              void __user *buffer, size_t *lenp, loff_t *ppos)
2269 {
2270         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2271                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2272 }
2273
2274 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2275                            void __user *buffer, size_t *lenp, loff_t *ppos)
2276 {
2277         struct pid *new_pid;
2278         pid_t tmp;
2279         int r;
2280
2281         tmp = pid_nr(cad_pid);
2282
2283         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2284                                lenp, ppos, NULL, NULL);
2285         if (r || !write)
2286                 return r;
2287
2288         new_pid = find_get_pid(tmp);
2289         if (!new_pid)
2290                 return -ESRCH;
2291
2292         put_pid(xchg(&cad_pid, new_pid));
2293         return 0;
2294 }
2295
2296 #else /* CONFIG_PROC_FS */
2297
2298 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2299                   void __user *buffer, size_t *lenp, loff_t *ppos)
2300 {
2301         return -ENOSYS;
2302 }
2303
2304 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2305                   void __user *buffer, size_t *lenp, loff_t *ppos)
2306 {
2307         return -ENOSYS;
2308 }
2309
2310 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2311                         void __user *buffer, size_t *lenp, loff_t *ppos)
2312 {
2313         return -ENOSYS;
2314 }
2315
2316 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2317                     void __user *buffer, size_t *lenp, loff_t *ppos)
2318 {
2319         return -ENOSYS;
2320 }
2321
2322 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2323                     void __user *buffer, size_t *lenp, loff_t *ppos)
2324 {
2325         return -ENOSYS;
2326 }
2327
2328 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2329                     void __user *buffer, size_t *lenp, loff_t *ppos)
2330 {
2331         return -ENOSYS;
2332 }
2333
2334 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2335                              void __user *buffer, size_t *lenp, loff_t *ppos)
2336 {
2337         return -ENOSYS;
2338 }
2339
2340 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2341                     void __user *buffer, size_t *lenp, loff_t *ppos)
2342 {
2343         return -ENOSYS;
2344 }
2345
2346 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2347                                       struct file *filp,
2348                                       void __user *buffer,
2349                                       size_t *lenp, loff_t *ppos)
2350 {
2351     return -ENOSYS;
2352 }
2353
2354
2355 #endif /* CONFIG_PROC_FS */
2356
2357
2358 #ifdef CONFIG_SYSCTL_SYSCALL
2359 /*
2360  * General sysctl support routines
2361  */
2362
2363 /* The generic sysctl data routine (used if no strategy routine supplied) */
2364 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2365                 void __user *oldval, size_t __user *oldlenp,
2366                 void __user *newval, size_t newlen)
2367 {
2368         size_t len;
2369
2370         /* Get out of I don't have a variable */
2371         if (!table->data || !table->maxlen)
2372                 return -ENOTDIR;
2373
2374         if (oldval && oldlenp) {
2375                 if (get_user(len, oldlenp))
2376                         return -EFAULT;
2377                 if (len) {
2378                         if (len > table->maxlen)
2379                                 len = table->maxlen;
2380                         if (copy_to_user(oldval, table->data, len))
2381                                 return -EFAULT;
2382                         if (put_user(len, oldlenp))
2383                                 return -EFAULT;
2384                 }
2385         }
2386
2387         if (newval && newlen) {
2388                 if (newlen > table->maxlen)
2389                         newlen = table->maxlen;
2390
2391                 if (copy_from_user(table->data, newval, newlen))
2392                         return -EFAULT;
2393         }
2394         return 1;
2395 }
2396
2397 /* The generic string strategy routine: */
2398 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2399                   void __user *oldval, size_t __user *oldlenp,
2400                   void __user *newval, size_t newlen)
2401 {
2402         if (!table->data || !table->maxlen)
2403                 return -ENOTDIR;
2404
2405         if (oldval && oldlenp) {
2406                 size_t bufsize;
2407                 if (get_user(bufsize, oldlenp))
2408                         return -EFAULT;
2409                 if (bufsize) {
2410                         size_t len = strlen(table->data), copied;
2411
2412                         /* This shouldn't trigger for a well-formed sysctl */
2413                         if (len > table->maxlen)
2414                                 len = table->maxlen;
2415
2416                         /* Copy up to a max of bufsize-1 bytes of the string */
2417                         copied = (len >= bufsize) ? bufsize - 1 : len;
2418
2419                         if (copy_to_user(oldval, table->data, copied) ||
2420                             put_user(0, (char __user *)(oldval + copied)))
2421                                 return -EFAULT;
2422                         if (put_user(len, oldlenp))
2423                                 return -EFAULT;
2424                 }
2425         }
2426         if (newval && newlen) {
2427                 size_t len = newlen;
2428                 if (len > table->maxlen)
2429                         len = table->maxlen;
2430                 if(copy_from_user(table->data, newval, len))
2431                         return -EFAULT;
2432                 if (len == table->maxlen)
2433                         len--;
2434                 ((char *) table->data)[len] = 0;
2435         }
2436         return 1;
2437 }
2438
2439 /*
2440  * This function makes sure that all of the integers in the vector
2441  * are between the minimum and maximum values given in the arrays
2442  * table->extra1 and table->extra2, respectively.
2443  */
2444 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2445                 void __user *oldval, size_t __user *oldlenp,
2446                 void __user *newval, size_t newlen)
2447 {
2448
2449         if (newval && newlen) {
2450                 int __user *vec = (int __user *) newval;
2451                 int *min = (int *) table->extra1;
2452                 int *max = (int *) table->extra2;
2453                 size_t length;
2454                 int i;
2455
2456                 if (newlen % sizeof(int) != 0)
2457                         return -EINVAL;
2458
2459                 if (!table->extra1 && !table->extra2)
2460                         return 0;
2461
2462                 if (newlen > table->maxlen)
2463                         newlen = table->maxlen;
2464                 length = newlen / sizeof(int);
2465
2466                 for (i = 0; i < length; i++) {
2467                         int value;
2468                         if (get_user(value, vec + i))
2469                                 return -EFAULT;
2470                         if (min && value < min[i])
2471                                 return -EINVAL;
2472                         if (max && value > max[i])
2473                                 return -EINVAL;
2474                 }
2475         }
2476         return 0;
2477 }
2478
2479 /* Strategy function to convert jiffies to seconds */
2480 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2481                 void __user *oldval, size_t __user *oldlenp,
2482                 void __user *newval, size_t newlen)
2483 {
2484         if (oldval && oldlenp) {
2485                 size_t olen;
2486
2487                 if (get_user(olen, oldlenp))
2488                         return -EFAULT;
2489                 if (olen) {
2490                         int val;
2491
2492                         if (olen < sizeof(int))
2493                                 return -EINVAL;
2494
2495                         val = *(int *)(table->data) / HZ;
2496                         if (put_user(val, (int __user *)oldval))
2497                                 return -EFAULT;
2498                         if (put_user(sizeof(int), oldlenp))
2499                                 return -EFAULT;
2500                 }
2501         }
2502         if (newval && newlen) {
2503                 int new;
2504                 if (newlen != sizeof(int))
2505                         return -EINVAL;
2506                 if (get_user(new, (int __user *)newval))
2507                         return -EFAULT;
2508                 *(int *)(table->data) = new*HZ;
2509         }
2510         return 1;
2511 }
2512
2513 /* Strategy function to convert jiffies to seconds */
2514 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2515                 void __user *oldval, size_t __user *oldlenp,
2516                 void __user *newval, size_t newlen)
2517 {
2518         if (oldval && oldlenp) {
2519                 size_t olen;
2520
2521                 if (get_user(olen, oldlenp))
2522                         return -EFAULT;
2523                 if (olen) {
2524                         int val;
2525
2526                         if (olen < sizeof(int))
2527                                 return -EINVAL;
2528
2529                         val = jiffies_to_msecs(*(int *)(table->data));
2530                         if (put_user(val, (int __user *)oldval))
2531                                 return -EFAULT;
2532                         if (put_user(sizeof(int), oldlenp))
2533                                 return -EFAULT;
2534                 }
2535         }
2536         if (newval && newlen) {
2537                 int new;
2538                 if (newlen != sizeof(int))
2539                         return -EINVAL;
2540                 if (get_user(new, (int __user *)newval))
2541                         return -EFAULT;
2542                 *(int *)(table->data) = msecs_to_jiffies(new);
2543         }
2544         return 1;
2545 }
2546
2547
2548
2549 #else /* CONFIG_SYSCTL_SYSCALL */
2550
2551
2552 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2553 {
2554         struct __sysctl_args tmp;
2555         int error;
2556
2557         if (copy_from_user(&tmp, args, sizeof(tmp)))
2558                 return -EFAULT;
2559
2560         error = deprecated_sysctl_warning(&tmp);
2561
2562         /* If no error reading the parameters then just -ENOSYS ... */
2563         if (!error)
2564                 error = -ENOSYS;
2565
2566         return error;
2567 }
2568
2569 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2570                   void __user *oldval, size_t __user *oldlenp,
2571                   void __user *newval, size_t newlen)
2572 {
2573         return -ENOSYS;
2574 }
2575
2576 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2577                   void __user *oldval, size_t __user *oldlenp,
2578                   void __user *newval, size_t newlen)
2579 {
2580         return -ENOSYS;
2581 }
2582
2583 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2584                 void __user *oldval, size_t __user *oldlenp,
2585                 void __user *newval, size_t newlen)
2586 {
2587         return -ENOSYS;
2588 }
2589
2590 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2591                 void __user *oldval, size_t __user *oldlenp,
2592                 void __user *newval, size_t newlen)
2593 {
2594         return -ENOSYS;
2595 }
2596
2597 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2598                 void __user *oldval, size_t __user *oldlenp,
2599                 void __user *newval, size_t newlen)
2600 {
2601         return -ENOSYS;
2602 }
2603
2604 #endif /* CONFIG_SYSCTL_SYSCALL */
2605
2606 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2607 {
2608         static int msg_count;
2609         int name[CTL_MAXNAME];
2610         int i;
2611
2612         /* Read in the sysctl name for better debug message logging */
2613         for (i = 0; i < args->nlen; i++)
2614                 if (get_user(name[i], args->name + i))
2615                         return -EFAULT;
2616
2617         /* Ignore accesses to kernel.version */
2618         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2619                 return 0;
2620
2621         if (msg_count < 5) {
2622                 msg_count++;
2623                 printk(KERN_INFO
2624                         "warning: process `%s' used the deprecated sysctl "
2625                         "system call with ", current->comm);
2626                 for (i = 0; i < args->nlen; i++)
2627                         printk("%d.", name[i]);
2628                 printk("\n");
2629         }
2630         return 0;
2631 }
2632
2633 /*
2634  * No sense putting this after each symbol definition, twice,
2635  * exception granted :-)
2636  */
2637 EXPORT_SYMBOL(proc_dointvec);
2638 EXPORT_SYMBOL(proc_dointvec_jiffies);
2639 EXPORT_SYMBOL(proc_dointvec_minmax);
2640 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2641 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2642 EXPORT_SYMBOL(proc_dostring);
2643 EXPORT_SYMBOL(proc_doulongvec_minmax);
2644 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2645 EXPORT_SYMBOL(register_sysctl_table);
2646 EXPORT_SYMBOL(sysctl_intvec);
2647 EXPORT_SYMBOL(sysctl_jiffies);
2648 EXPORT_SYMBOL(sysctl_ms_jiffies);
2649 EXPORT_SYMBOL(sysctl_string);
2650 EXPORT_SYMBOL(sysctl_data);
2651 EXPORT_SYMBOL(unregister_sysctl_table);