kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/key.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49
  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 #include <asm/io.h>
  57 #endif
  58
  59 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  60
  61 #if defined(CONFIG_SYSCTL)
  62
  63 /* External variables not in a header file. */
  64 extern int C_A_D;
  65 extern int print_fatal_signals;
  66 extern int sysctl_overcommit_memory;
  67 extern int sysctl_overcommit_ratio;
  68 extern int sysctl_panic_on_oom;
  69 extern int sysctl_oom_kill_allocating_task;
  70 extern int sysctl_oom_dump_tasks;
  71 extern int max_threads;
  72 extern int core_uses_pid;
  73 extern int suid_dumpable;
  74 extern char core_pattern[];
  75 extern int pid_max;
  76 extern int min_free_kbytes;
  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 latencytop_enabled;
  84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  85 #ifdef CONFIG_RCU_TORTURE_TEST
  86 extern int rcutorture_runnable;
  87 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
  88
  89 /* Constants used for minimum and  maximum */
  90 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
  91 static int one = 1;
  92 #endif
  93
  94 #ifdef CONFIG_DETECT_SOFTLOCKUP
  95 static int sixty = 60;
  96 #endif
  97
  98 #ifdef CONFIG_MMU
  99 static int two = 2;
 100 #endif
 101
 102 static int zero;
 103 static int one_hundred = 100;
 104
 105 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 106 static int maxolduid = 65535;
 107 static int minolduid;
 108 static int min_percpu_pagelist_fract = 8;
 109
 110 static int ngroups_max = NGROUPS_MAX;
 111
 112 #ifdef CONFIG_KMOD
 113 extern char modprobe_path[];
 114 #endif
 115 #ifdef CONFIG_CHR_DEV_SG
 116 extern int sg_big_buff;
 117 #endif
 118
 119 #ifdef __sparc__
 120 extern char reboot_command [];
 121 extern int stop_a_enabled;
 122 extern int scons_pwroff;
 123 #endif
 124
 125 #ifdef __hppa__
 126 extern int pwrsw_enabled;
 127 extern int unaligned_enabled;
 128 #endif
 129
 130 #ifdef CONFIG_S390
 131 #ifdef CONFIG_MATHEMU
 132 extern int sysctl_ieee_emulation_warnings;
 133 #endif
 134 extern int sysctl_userprocess_debug;
 135 extern int spin_retry;
 136 #endif
 137
 138 extern int sysctl_hz_timer;
 139
 140 #ifdef CONFIG_BSD_PROCESS_ACCT
 141 extern int acct_parm[];
 142 #endif
 143
 144 #ifdef CONFIG_IA64
 145 extern int no_unaligned_warning;
 146 #endif
 147
 148 #ifdef CONFIG_RT_MUTEXES
 149 extern int max_lock_depth;
 150 #endif
 151
 152 #ifdef CONFIG_PROC_SYSCTL
 153 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 154                   void __user *buffer, size_t *lenp, loff_t *ppos);
 155 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 156                                void __user *buffer, size_t *lenp, loff_t *ppos);
 157 #endif
 158
 159 static struct ctl_table root_table[];
 160 static struct ctl_table_root sysctl_table_root;
 161 static struct ctl_table_header root_table_header = {
 162         .ctl_table = root_table,
 163         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 164         .root = &sysctl_table_root,
 165 };
 166 static struct ctl_table_root sysctl_table_root = {
 167         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 168         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 169 };
 170
 171 static struct ctl_table kern_table[];
 172 static struct ctl_table vm_table[];
 173 static struct ctl_table fs_table[];
 174 static struct ctl_table debug_table[];
 175 static struct ctl_table dev_table[];
 176 extern struct ctl_table random_table[];
 177 #ifdef CONFIG_INOTIFY_USER
 178 extern struct ctl_table inotify_table[];
 179 #endif
 180
 181 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 182 int sysctl_legacy_va_layout;
 183 #endif
 184
 185 extern int prove_locking;
 186 extern int lock_stat;
 187
 188 /* The default sysctl tables: */
 189
 190 static struct ctl_table root_table[] = {
 191         {
 192                 .ctl_name       = CTL_KERN,
 193                 .procname       = "kernel",
 194                 .mode           = 0555,
 195                 .child          = kern_table,
 196         },
 197         {
 198                 .ctl_name       = CTL_VM,
 199                 .procname       = "vm",
 200                 .mode           = 0555,
 201                 .child          = vm_table,
 202         },
 203         {
 204                 .ctl_name       = CTL_FS,
 205                 .procname       = "fs",
 206                 .mode           = 0555,
 207                 .child          = fs_table,
 208         },
 209         {
 210                 .ctl_name       = CTL_DEBUG,
 211                 .procname       = "debug",
 212                 .mode           = 0555,
 213                 .child          = debug_table,
 214         },
 215         {
 216                 .ctl_name       = CTL_DEV,
 217                 .procname       = "dev",
 218                 .mode           = 0555,
 219                 .child          = dev_table,
 220         },
 221 /*
 222  * NOTE: do not add new entries to this table unless you have read
 223  * Documentation/sysctl/ctl_unnumbered.txt
 224  */
 225         { .ctl_name = 0 }
 226 };
 227
 228 #ifdef CONFIG_SCHED_DEBUG
 229 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 230 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 231 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 232 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 233 #endif
 234
 235 static struct ctl_table kern_table[] = {
 236 #ifdef CONFIG_SCHED_DEBUG
 237         {
 238                 .ctl_name       = CTL_UNNUMBERED,
 239                 .procname       = "sched_min_granularity_ns",
 240                 .data           = &sysctl_sched_min_granularity,
 241                 .maxlen         = sizeof(unsigned int),
 242                 .mode           = 0644,
 243                 .proc_handler   = &sched_nr_latency_handler,
 244                 .strategy       = &sysctl_intvec,
 245                 .extra1         = &min_sched_granularity_ns,
 246                 .extra2         = &max_sched_granularity_ns,
 247         },
 248         {
 249                 .ctl_name       = CTL_UNNUMBERED,
 250                 .procname       = "sched_latency_ns",
 251                 .data           = &sysctl_sched_latency,
 252                 .maxlen         = sizeof(unsigned int),
 253                 .mode           = 0644,
 254                 .proc_handler   = &sched_nr_latency_handler,
 255                 .strategy       = &sysctl_intvec,
 256                 .extra1         = &min_sched_granularity_ns,
 257                 .extra2         = &max_sched_granularity_ns,
 258         },
 259         {
 260                 .ctl_name       = CTL_UNNUMBERED,
 261                 .procname       = "sched_wakeup_granularity_ns",
 262                 .data           = &sysctl_sched_wakeup_granularity,
 263                 .maxlen         = sizeof(unsigned int),
 264                 .mode           = 0644,
 265                 .proc_handler   = &proc_dointvec_minmax,
 266                 .strategy       = &sysctl_intvec,
 267                 .extra1         = &min_wakeup_granularity_ns,
 268                 .extra2         = &max_wakeup_granularity_ns,
 269         },
 270         {
 271                 .ctl_name       = CTL_UNNUMBERED,
 272                 .procname       = "sched_child_runs_first",
 273                 .data           = &sysctl_sched_child_runs_first,
 274                 .maxlen         = sizeof(unsigned int),
 275                 .mode           = 0644,
 276                 .proc_handler   = &proc_dointvec,
 277         },
 278         {
 279                 .ctl_name       = CTL_UNNUMBERED,
 280                 .procname       = "sched_features",
 281                 .data           = &sysctl_sched_features,
 282                 .maxlen         = sizeof(unsigned int),
 283                 .mode           = 0644,
 284                 .proc_handler   = &proc_dointvec,
 285         },
 286         {
 287                 .ctl_name       = CTL_UNNUMBERED,
 288                 .procname       = "sched_migration_cost",
 289                 .data           = &sysctl_sched_migration_cost,
 290                 .maxlen         = sizeof(unsigned int),
 291                 .mode           = 0644,
 292                 .proc_handler   = &proc_dointvec,
 293         },
 294         {
 295                 .ctl_name       = CTL_UNNUMBERED,
 296                 .procname       = "sched_nr_migrate",
 297                 .data           = &sysctl_sched_nr_migrate,
 298                 .maxlen         = sizeof(unsigned int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec,
 301         },
 302 #endif
 303         {
 304                 .ctl_name       = CTL_UNNUMBERED,
 305                 .procname       = "sched_rt_period_us",
 306                 .data           = &sysctl_sched_rt_period,
 307                 .maxlen         = sizeof(unsigned int),
 308                 .mode           = 0644,
 309                 .proc_handler   = &sched_rt_handler,
 310         },
 311         {
 312                 .ctl_name       = CTL_UNNUMBERED,
 313                 .procname       = "sched_rt_runtime_us",
 314                 .data           = &sysctl_sched_rt_runtime,
 315                 .maxlen         = sizeof(int),
 316                 .mode           = 0644,
 317                 .proc_handler   = &sched_rt_handler,
 318         },
 319         {
 320                 .ctl_name       = CTL_UNNUMBERED,
 321                 .procname       = "sched_compat_yield",
 322                 .data           = &sysctl_sched_compat_yield,
 323                 .maxlen         = sizeof(unsigned int),
 324                 .mode           = 0644,
 325                 .proc_handler   = &proc_dointvec,
 326         },
 327 #ifdef CONFIG_PROVE_LOCKING
 328         {
 329                 .ctl_name       = CTL_UNNUMBERED,
 330                 .procname       = "prove_locking",
 331                 .data           = &prove_locking,
 332                 .maxlen         = sizeof(int),
 333                 .mode           = 0644,
 334                 .proc_handler   = &proc_dointvec,
 335         },
 336 #endif
 337 #ifdef CONFIG_LOCK_STAT
 338         {
 339                 .ctl_name       = CTL_UNNUMBERED,
 340                 .procname       = "lock_stat",
 341                 .data           = &lock_stat,
 342                 .maxlen         = sizeof(int),
 343                 .mode           = 0644,
 344                 .proc_handler   = &proc_dointvec,
 345         },
 346 #endif
 347         {
 348                 .ctl_name       = KERN_PANIC,
 349                 .procname       = "panic",
 350                 .data           = &panic_timeout,
 351                 .maxlen         = sizeof(int),
 352                 .mode           = 0644,
 353                 .proc_handler   = &proc_dointvec,
 354         },
 355         {
 356                 .ctl_name       = KERN_CORE_USES_PID,
 357                 .procname       = "core_uses_pid",
 358                 .data           = &core_uses_pid,
 359                 .maxlen         = sizeof(int),
 360                 .mode           = 0644,
 361                 .proc_handler   = &proc_dointvec,
 362         },
 363         {
 364                 .ctl_name       = KERN_CORE_PATTERN,
 365                 .procname       = "core_pattern",
 366                 .data           = core_pattern,
 367                 .maxlen         = CORENAME_MAX_SIZE,
 368                 .mode           = 0644,
 369                 .proc_handler   = &proc_dostring,
 370                 .strategy       = &sysctl_string,
 371         },
 372 #ifdef CONFIG_PROC_SYSCTL
 373         {
 374                 .procname       = "tainted",
 375                 .data           = &tainted,
 376                 .maxlen         = sizeof(int),
 377                 .mode           = 0644,
 378                 .proc_handler   = &proc_dointvec_taint,
 379         },
 380 #endif
 381 #ifdef CONFIG_LATENCYTOP
 382         {
 383                 .procname       = "latencytop",
 384                 .data           = &latencytop_enabled,
 385                 .maxlen         = sizeof(int),
 386                 .mode           = 0644,
 387                 .proc_handler   = &proc_dointvec,
 388         },
 389 #endif
 390 #ifdef CONFIG_BLK_DEV_INITRD
 391         {
 392                 .ctl_name       = KERN_REALROOTDEV,
 393                 .procname       = "real-root-dev",
 394                 .data           = &real_root_dev,
 395                 .maxlen         = sizeof(int),
 396                 .mode           = 0644,
 397                 .proc_handler   = &proc_dointvec,
 398         },
 399 #endif
 400         {
 401                 .ctl_name       = CTL_UNNUMBERED,
 402                 .procname       = "print-fatal-signals",
 403                 .data           = &print_fatal_signals,
 404                 .maxlen         = sizeof(int),
 405                 .mode           = 0644,
 406                 .proc_handler   = &proc_dointvec,
 407         },
 408 #ifdef __sparc__
 409         {
 410                 .ctl_name       = KERN_SPARC_REBOOT,
 411                 .procname       = "reboot-cmd",
 412                 .data           = reboot_command,
 413                 .maxlen         = 256,
 414                 .mode           = 0644,
 415                 .proc_handler   = &proc_dostring,
 416                 .strategy       = &sysctl_string,
 417         },
 418         {
 419                 .ctl_name       = KERN_SPARC_STOP_A,
 420                 .procname       = "stop-a",
 421                 .data           = &stop_a_enabled,
 422                 .maxlen         = sizeof (int),
 423                 .mode           = 0644,
 424                 .proc_handler   = &proc_dointvec,
 425         },
 426         {
 427                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 428                 .procname       = "scons-poweroff",
 429                 .data           = &scons_pwroff,
 430                 .maxlen         = sizeof (int),
 431                 .mode           = 0644,
 432                 .proc_handler   = &proc_dointvec,
 433         },
 434 #endif
 435 #ifdef __hppa__
 436         {
 437                 .ctl_name       = KERN_HPPA_PWRSW,
 438                 .procname       = "soft-power",
 439                 .data           = &pwrsw_enabled,
 440                 .maxlen         = sizeof (int),
 441                 .mode           = 0644,
 442                 .proc_handler   = &proc_dointvec,
 443         },
 444         {
 445                 .ctl_name       = KERN_HPPA_UNALIGNED,
 446                 .procname       = "unaligned-trap",
 447                 .data           = &unaligned_enabled,
 448                 .maxlen         = sizeof (int),
 449                 .mode           = 0644,
 450                 .proc_handler   = &proc_dointvec,
 451         },
 452 #endif
 453         {
 454                 .ctl_name       = KERN_CTLALTDEL,
 455                 .procname       = "ctrl-alt-del",
 456                 .data           = &C_A_D,
 457                 .maxlen         = sizeof(int),
 458                 .mode           = 0644,
 459                 .proc_handler   = &proc_dointvec,
 460         },
 461 #ifdef CONFIG_KMOD
 462         {
 463                 .ctl_name       = KERN_MODPROBE,
 464                 .procname       = "modprobe",
 465                 .data           = &modprobe_path,
 466                 .maxlen         = KMOD_PATH_LEN,
 467                 .mode           = 0644,
 468                 .proc_handler   = &proc_dostring,
 469                 .strategy       = &sysctl_string,
 470         },
 471 #endif
 472 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 473         {
 474                 .ctl_name       = KERN_HOTPLUG,
 475                 .procname       = "hotplug",
 476                 .data           = &uevent_helper,
 477                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 478                 .mode           = 0644,
 479                 .proc_handler   = &proc_dostring,
 480                 .strategy       = &sysctl_string,
 481         },
 482 #endif
 483 #ifdef CONFIG_CHR_DEV_SG
 484         {
 485                 .ctl_name       = KERN_SG_BIG_BUFF,
 486                 .procname       = "sg-big-buff",
 487                 .data           = &sg_big_buff,
 488                 .maxlen         = sizeof (int),
 489                 .mode           = 0444,
 490                 .proc_handler   = &proc_dointvec,
 491         },
 492 #endif
 493 #ifdef CONFIG_BSD_PROCESS_ACCT
 494         {
 495                 .ctl_name       = KERN_ACCT,
 496                 .procname       = "acct",
 497                 .data           = &acct_parm,
 498                 .maxlen         = 3*sizeof(int),
 499                 .mode           = 0644,
 500                 .proc_handler   = &proc_dointvec,
 501         },
 502 #endif
 503 #ifdef CONFIG_MAGIC_SYSRQ
 504         {
 505                 .ctl_name       = KERN_SYSRQ,
 506                 .procname       = "sysrq",
 507                 .data           = &__sysrq_enabled,
 508                 .maxlen         = sizeof (int),
 509                 .mode           = 0644,
 510                 .proc_handler   = &proc_dointvec,
 511         },
 512 #endif
 513 #ifdef CONFIG_PROC_SYSCTL
 514         {
 515                 .procname       = "cad_pid",
 516                 .data           = NULL,
 517                 .maxlen         = sizeof (int),
 518                 .mode           = 0600,
 519                 .proc_handler   = &proc_do_cad_pid,
 520         },
 521 #endif
 522         {
 523                 .ctl_name       = KERN_MAX_THREADS,
 524                 .procname       = "threads-max",
 525                 .data           = &max_threads,
 526                 .maxlen         = sizeof(int),
 527                 .mode           = 0644,
 528                 .proc_handler   = &proc_dointvec,
 529         },
 530         {
 531                 .ctl_name       = KERN_RANDOM,
 532                 .procname       = "random",
 533                 .mode           = 0555,
 534                 .child          = random_table,
 535         },
 536         {
 537                 .ctl_name       = KERN_OVERFLOWUID,
 538                 .procname       = "overflowuid",
 539                 .data           = &overflowuid,
 540                 .maxlen         = sizeof(int),
 541                 .mode           = 0644,
 542                 .proc_handler   = &proc_dointvec_minmax,
 543                 .strategy       = &sysctl_intvec,
 544                 .extra1         = &minolduid,
 545                 .extra2         = &maxolduid,
 546         },
 547         {
 548                 .ctl_name       = KERN_OVERFLOWGID,
 549                 .procname       = "overflowgid",
 550                 .data           = &overflowgid,
 551                 .maxlen         = sizeof(int),
 552                 .mode           = 0644,
 553                 .proc_handler   = &proc_dointvec_minmax,
 554                 .strategy       = &sysctl_intvec,
 555                 .extra1         = &minolduid,
 556                 .extra2         = &maxolduid,
 557         },
 558 #ifdef CONFIG_S390
 559 #ifdef CONFIG_MATHEMU
 560         {
 561                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 562                 .procname       = "ieee_emulation_warnings",
 563                 .data           = &sysctl_ieee_emulation_warnings,
 564                 .maxlen         = sizeof(int),
 565                 .mode           = 0644,
 566                 .proc_handler   = &proc_dointvec,
 567         },
 568 #endif
 569 #ifdef CONFIG_NO_IDLE_HZ
 570         {
 571                 .ctl_name       = KERN_HZ_TIMER,
 572                 .procname       = "hz_timer",
 573                 .data           = &sysctl_hz_timer,
 574                 .maxlen         = sizeof(int),
 575                 .mode           = 0644,
 576                 .proc_handler   = &proc_dointvec,
 577         },
 578 #endif
 579         {
 580                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 581                 .procname       = "userprocess_debug",
 582                 .data           = &sysctl_userprocess_debug,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec,
 586         },
 587 #endif
 588         {
 589                 .ctl_name       = KERN_PIDMAX,
 590                 .procname       = "pid_max",
 591                 .data           = &pid_max,
 592                 .maxlen         = sizeof (int),
 593                 .mode           = 0644,
 594                 .proc_handler   = &proc_dointvec_minmax,
 595                 .strategy       = sysctl_intvec,
 596                 .extra1         = &pid_max_min,
 597                 .extra2         = &pid_max_max,
 598         },
 599         {
 600                 .ctl_name       = KERN_PANIC_ON_OOPS,
 601                 .procname       = "panic_on_oops",
 602                 .data           = &panic_on_oops,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = &proc_dointvec,
 606         },
 607 #if defined CONFIG_PRINTK
 608         {
 609                 .ctl_name       = KERN_PRINTK,
 610                 .procname       = "printk",
 611                 .data           = &console_loglevel,
 612                 .maxlen         = 4*sizeof(int),
 613                 .mode           = 0644,
 614                 .proc_handler   = &proc_dointvec,
 615         },
 616         {
 617                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 618                 .procname       = "printk_ratelimit",
 619                 .data           = &printk_ratelimit_jiffies,
 620                 .maxlen         = sizeof(int),
 621                 .mode           = 0644,
 622                 .proc_handler   = &proc_dointvec_jiffies,
 623                 .strategy       = &sysctl_jiffies,
 624         },
 625         {
 626                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 627                 .procname       = "printk_ratelimit_burst",
 628                 .data           = &printk_ratelimit_burst,
 629                 .maxlen         = sizeof(int),
 630                 .mode           = 0644,
 631                 .proc_handler   = &proc_dointvec,
 632         },
 633 #endif
 634         {
 635                 .ctl_name       = KERN_NGROUPS_MAX,
 636                 .procname       = "ngroups_max",
 637                 .data           = &ngroups_max,
 638                 .maxlen         = sizeof (int),
 639                 .mode           = 0444,
 640                 .proc_handler   = &proc_dointvec,
 641         },
 642 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 643         {
 644                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 645                 .procname       = "unknown_nmi_panic",
 646                 .data           = &unknown_nmi_panic,
 647                 .maxlen         = sizeof (int),
 648                 .mode           = 0644,
 649                 .proc_handler   = &proc_dointvec,
 650         },
 651         {
 652                 .procname       = "nmi_watchdog",
 653                 .data           = &nmi_watchdog_enabled,
 654                 .maxlen         = sizeof (int),
 655                 .mode           = 0644,
 656                 .proc_handler   = &proc_nmi_enabled,
 657         },
 658 #endif
 659 #if defined(CONFIG_X86)
 660         {
 661                 .ctl_name       = KERN_PANIC_ON_NMI,
 662                 .procname       = "panic_on_unrecovered_nmi",
 663                 .data           = &panic_on_unrecovered_nmi,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 .proc_handler   = &proc_dointvec,
 667         },
 668         {
 669                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 670                 .procname       = "bootloader_type",
 671                 .data           = &bootloader_type,
 672                 .maxlen         = sizeof (int),
 673                 .mode           = 0444,
 674                 .proc_handler   = &proc_dointvec,
 675         },
 676         {
 677                 .ctl_name       = CTL_UNNUMBERED,
 678                 .procname       = "kstack_depth_to_print",
 679                 .data           = &kstack_depth_to_print,
 680                 .maxlen         = sizeof(int),
 681                 .mode           = 0644,
 682                 .proc_handler   = &proc_dointvec,
 683         },
 684         {
 685                 .ctl_name       = CTL_UNNUMBERED,
 686                 .procname       = "io_delay_type",
 687                 .data           = &io_delay_type,
 688                 .maxlen         = sizeof(int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_dointvec,
 691         },
 692 #endif
 693 #if defined(CONFIG_MMU)
 694         {
 695                 .ctl_name       = KERN_RANDOMIZE,
 696                 .procname       = "randomize_va_space",
 697                 .data           = &randomize_va_space,
 698                 .maxlen         = sizeof(int),
 699                 .mode           = 0644,
 700                 .proc_handler   = &proc_dointvec,
 701         },
 702 #endif
 703 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 704         {
 705                 .ctl_name       = KERN_SPIN_RETRY,
 706                 .procname       = "spin_retry",
 707                 .data           = &spin_retry,
 708                 .maxlen         = sizeof (int),
 709                 .mode           = 0644,
 710                 .proc_handler   = &proc_dointvec,
 711         },
 712 #endif
 713 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 714         {
 715                 .procname       = "acpi_video_flags",
 716                 .data           = &acpi_realmode_flags,
 717                 .maxlen         = sizeof (unsigned long),
 718                 .mode           = 0644,
 719                 .proc_handler   = &proc_doulongvec_minmax,
 720         },
 721 #endif
 722 #ifdef CONFIG_IA64
 723         {
 724                 .ctl_name       = KERN_IA64_UNALIGNED,
 725                 .procname       = "ignore-unaligned-usertrap",
 726                 .data           = &no_unaligned_warning,
 727                 .maxlen         = sizeof (int),
 728                 .mode           = 0644,
 729                 .proc_handler   = &proc_dointvec,
 730         },
 731 #endif
 732 #ifdef CONFIG_DETECT_SOFTLOCKUP
 733         {
 734                 .ctl_name       = CTL_UNNUMBERED,
 735                 .procname       = "softlockup_thresh",
 736                 .data           = &softlockup_thresh,
 737                 .maxlen         = sizeof(unsigned long),
 738                 .mode           = 0644,
 739                 .proc_handler   = &proc_doulongvec_minmax,
 740                 .strategy       = &sysctl_intvec,
 741                 .extra1         = &one,
 742                 .extra2         = &sixty,
 743         },
 744         {
 745                 .ctl_name       = CTL_UNNUMBERED,
 746                 .procname       = "hung_task_check_count",
 747                 .data           = &sysctl_hung_task_check_count,
 748                 .maxlen         = sizeof(unsigned long),
 749                 .mode           = 0644,
 750                 .proc_handler   = &proc_doulongvec_minmax,
 751                 .strategy       = &sysctl_intvec,
 752         },
 753         {
 754                 .ctl_name       = CTL_UNNUMBERED,
 755                 .procname       = "hung_task_timeout_secs",
 756                 .data           = &sysctl_hung_task_timeout_secs,
 757                 .maxlen         = sizeof(unsigned long),
 758                 .mode           = 0644,
 759                 .proc_handler   = &proc_doulongvec_minmax,
 760                 .strategy       = &sysctl_intvec,
 761         },
 762         {
 763                 .ctl_name       = CTL_UNNUMBERED,
 764                 .procname       = "hung_task_warnings",
 765                 .data           = &sysctl_hung_task_warnings,
 766                 .maxlen         = sizeof(unsigned long),
 767                 .mode           = 0644,
 768                 .proc_handler   = &proc_doulongvec_minmax,
 769                 .strategy       = &sysctl_intvec,
 770         },
 771 #endif
 772 #ifdef CONFIG_COMPAT
 773         {
 774                 .ctl_name       = KERN_COMPAT_LOG,
 775                 .procname       = "compat-log",
 776                 .data           = &compat_log,
 777                 .maxlen         = sizeof (int),
 778                 .mode           = 0644,
 779                 .proc_handler   = &proc_dointvec,
 780         },
 781 #endif
 782 #ifdef CONFIG_RT_MUTEXES
 783         {
 784                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 785                 .procname       = "max_lock_depth",
 786                 .data           = &max_lock_depth,
 787                 .maxlen         = sizeof(int),
 788                 .mode           = 0644,
 789                 .proc_handler   = &proc_dointvec,
 790         },
 791 #endif
 792 #ifdef CONFIG_PROC_FS
 793         {
 794                 .ctl_name       = CTL_UNNUMBERED,
 795                 .procname       = "maps_protect",
 796                 .data           = &maps_protect,
 797                 .maxlen         = sizeof(int),
 798                 .mode           = 0644,
 799                 .proc_handler   = &proc_dointvec,
 800         },
 801 #endif
 802         {
 803                 .ctl_name       = CTL_UNNUMBERED,
 804                 .procname       = "poweroff_cmd",
 805                 .data           = &poweroff_cmd,
 806                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 807                 .mode           = 0644,
 808                 .proc_handler   = &proc_dostring,
 809                 .strategy       = &sysctl_string,
 810         },
 811 #ifdef CONFIG_KEYS
 812         {
 813                 .ctl_name       = CTL_UNNUMBERED,
 814                 .procname       = "keys",
 815                 .mode           = 0555,
 816                 .child          = key_sysctls,
 817         },
 818 #endif
 819 #ifdef CONFIG_RCU_TORTURE_TEST
 820         {
 821                 .ctl_name       = CTL_UNNUMBERED,
 822                 .procname       = "rcutorture_runnable",
 823                 .data           = &rcutorture_runnable,
 824                 .maxlen         = sizeof(int),
 825                 .mode           = 0644,
 826                 .proc_handler   = &proc_dointvec,
 827         },
 828 #endif
 829 /*
 830  * NOTE: do not add new entries to this table unless you have read
 831  * Documentation/sysctl/ctl_unnumbered.txt
 832  */
 833         { .ctl_name = 0 }
 834 };
 835
 836 static struct ctl_table vm_table[] = {
 837         {
 838                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 839                 .procname       = "overcommit_memory",
 840                 .data           = &sysctl_overcommit_memory,
 841                 .maxlen         = sizeof(sysctl_overcommit_memory),
 842                 .mode           = 0644,
 843                 .proc_handler   = &proc_dointvec,
 844         },
 845         {
 846                 .ctl_name       = VM_PANIC_ON_OOM,
 847                 .procname       = "panic_on_oom",
 848                 .data           = &sysctl_panic_on_oom,
 849                 .maxlen         = sizeof(sysctl_panic_on_oom),
 850                 .mode           = 0644,
 851                 .proc_handler   = &proc_dointvec,
 852         },
 853         {
 854                 .ctl_name       = CTL_UNNUMBERED,
 855                 .procname       = "oom_kill_allocating_task",
 856                 .data           = &sysctl_oom_kill_allocating_task,
 857                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 858                 .mode           = 0644,
 859                 .proc_handler   = &proc_dointvec,
 860         },
 861         {
 862                 .ctl_name       = CTL_UNNUMBERED,
 863                 .procname       = "oom_dump_tasks",
 864                 .data           = &sysctl_oom_dump_tasks,
 865                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 866                 .mode           = 0644,
 867                 .proc_handler   = &proc_dointvec,
 868         },
 869         {
 870                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 871                 .procname       = "overcommit_ratio",
 872                 .data           = &sysctl_overcommit_ratio,
 873                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 874                 .mode           = 0644,
 875                 .proc_handler   = &proc_dointvec,
 876         },
 877         {
 878                 .ctl_name       = VM_PAGE_CLUSTER,
 879                 .procname       = "page-cluster",
 880                 .data           = &page_cluster,
 881                 .maxlen         = sizeof(int),
 882                 .mode           = 0644,
 883                 .proc_handler   = &proc_dointvec,
 884         },
 885         {
 886                 .ctl_name       = VM_DIRTY_BACKGROUND,
 887                 .procname       = "dirty_background_ratio",
 888                 .data           = &dirty_background_ratio,
 889                 .maxlen         = sizeof(dirty_background_ratio),
 890                 .mode           = 0644,
 891                 .proc_handler   = &proc_dointvec_minmax,
 892                 .strategy       = &sysctl_intvec,
 893                 .extra1         = &zero,
 894                 .extra2         = &one_hundred,
 895         },
 896         {
 897                 .ctl_name       = VM_DIRTY_RATIO,
 898                 .procname       = "dirty_ratio",
 899                 .data           = &vm_dirty_ratio,
 900                 .maxlen         = sizeof(vm_dirty_ratio),
 901                 .mode           = 0644,
 902                 .proc_handler   = &dirty_ratio_handler,
 903                 .strategy       = &sysctl_intvec,
 904                 .extra1         = &zero,
 905                 .extra2         = &one_hundred,
 906         },
 907         {
 908                 .procname       = "dirty_writeback_centisecs",
 909                 .data           = &dirty_writeback_interval,
 910                 .maxlen         = sizeof(dirty_writeback_interval),
 911                 .mode           = 0644,
 912                 .proc_handler   = &dirty_writeback_centisecs_handler,
 913         },
 914         {
 915                 .procname       = "dirty_expire_centisecs",
 916                 .data           = &dirty_expire_interval,
 917                 .maxlen         = sizeof(dirty_expire_interval),
 918                 .mode           = 0644,
 919                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 920         },
 921         {
 922                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 923                 .procname       = "nr_pdflush_threads",
 924                 .data           = &nr_pdflush_threads,
 925                 .maxlen         = sizeof nr_pdflush_threads,
 926                 .mode           = 0444 /* read-only*/,
 927                 .proc_handler   = &proc_dointvec,
 928         },
 929         {
 930                 .ctl_name       = VM_SWAPPINESS,
 931                 .procname       = "swappiness",
 932                 .data           = &vm_swappiness,
 933                 .maxlen         = sizeof(vm_swappiness),
 934                 .mode           = 0644,
 935                 .proc_handler   = &proc_dointvec_minmax,
 936                 .strategy       = &sysctl_intvec,
 937                 .extra1         = &zero,
 938                 .extra2         = &one_hundred,
 939         },
 940 #ifdef CONFIG_HUGETLB_PAGE
 941          {
 942                 .procname       = "nr_hugepages",
 943                 .data           = &max_huge_pages,
 944                 .maxlen         = sizeof(unsigned long),
 945                 .mode           = 0644,
 946                 .proc_handler   = &hugetlb_sysctl_handler,
 947                 .extra1         = (void *)&hugetlb_zero,
 948                 .extra2         = (void *)&hugetlb_infinity,
 949          },
 950          {
 951                 .ctl_name       = VM_HUGETLB_GROUP,
 952                 .procname       = "hugetlb_shm_group",
 953                 .data           = &sysctl_hugetlb_shm_group,
 954                 .maxlen         = sizeof(gid_t),
 955                 .mode           = 0644,
 956                 .proc_handler   = &proc_dointvec,
 957          },
 958          {
 959                 .ctl_name       = CTL_UNNUMBERED,
 960                 .procname       = "hugepages_treat_as_movable",
 961                 .data           = &hugepages_treat_as_movable,
 962                 .maxlen         = sizeof(int),
 963                 .mode           = 0644,
 964                 .proc_handler   = &hugetlb_treat_movable_handler,
 965         },
 966         {
 967                 .ctl_name       = CTL_UNNUMBERED,
 968                 .procname       = "nr_overcommit_hugepages",
 969                 .data           = &sysctl_overcommit_huge_pages,
 970                 .maxlen         = sizeof(sysctl_overcommit_huge_pages),
 971                 .mode           = 0644,
 972                 .proc_handler   = &hugetlb_overcommit_handler,
 973         },
 974 #endif
 975         {
 976                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 977                 .procname       = "lowmem_reserve_ratio",
 978                 .data           = &sysctl_lowmem_reserve_ratio,
 979                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 980                 .mode           = 0644,
 981                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 982                 .strategy       = &sysctl_intvec,
 983         },
 984         {
 985                 .ctl_name       = VM_DROP_PAGECACHE,
 986                 .procname       = "drop_caches",
 987                 .data           = &sysctl_drop_caches,
 988                 .maxlen         = sizeof(int),
 989                 .mode           = 0644,
 990                 .proc_handler   = drop_caches_sysctl_handler,
 991                 .strategy       = &sysctl_intvec,
 992         },
 993         {
 994                 .ctl_name       = VM_MIN_FREE_KBYTES,
 995                 .procname       = "min_free_kbytes",
 996                 .data           = &min_free_kbytes,
 997                 .maxlen         = sizeof(min_free_kbytes),
 998                 .mode           = 0644,
 999                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1000                 .strategy       = &sysctl_intvec,
1001                 .extra1         = &zero,
1002         },
1003         {
1004                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1005                 .procname       = "percpu_pagelist_fraction",
1006                 .data           = &percpu_pagelist_fraction,
1007                 .maxlen         = sizeof(percpu_pagelist_fraction),
1008                 .mode           = 0644,
1009                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1010                 .strategy       = &sysctl_intvec,
1011                 .extra1         = &min_percpu_pagelist_fract,
1012         },
1013 #ifdef CONFIG_MMU
1014         {
1015                 .ctl_name       = VM_MAX_MAP_COUNT,
1016                 .procname       = "max_map_count",
1017                 .data           = &sysctl_max_map_count,
1018                 .maxlen         = sizeof(sysctl_max_map_count),
1019                 .mode           = 0644,
1020                 .proc_handler   = &proc_dointvec
1021         },
1022 #endif
1023         {
1024                 .ctl_name       = VM_LAPTOP_MODE,
1025                 .procname       = "laptop_mode",
1026                 .data           = &laptop_mode,
1027                 .maxlen         = sizeof(laptop_mode),
1028                 .mode           = 0644,
1029                 .proc_handler   = &proc_dointvec_jiffies,
1030                 .strategy       = &sysctl_jiffies,
1031         },
1032         {
1033                 .ctl_name       = VM_BLOCK_DUMP,
1034                 .procname       = "block_dump",
1035                 .data           = &block_dump,
1036                 .maxlen         = sizeof(block_dump),
1037                 .mode           = 0644,
1038                 .proc_handler   = &proc_dointvec,
1039                 .strategy       = &sysctl_intvec,
1040                 .extra1         = &zero,
1041         },
1042         {
1043                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1044                 .procname       = "vfs_cache_pressure",
1045                 .data           = &sysctl_vfs_cache_pressure,
1046                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1047                 .mode           = 0644,
1048                 .proc_handler   = &proc_dointvec,
1049                 .strategy       = &sysctl_intvec,
1050                 .extra1         = &zero,
1051         },
1052 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1053         {
1054                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1055                 .procname       = "legacy_va_layout",
1056                 .data           = &sysctl_legacy_va_layout,
1057                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1058                 .mode           = 0644,
1059                 .proc_handler   = &proc_dointvec,
1060                 .strategy       = &sysctl_intvec,
1061                 .extra1         = &zero,
1062         },
1063 #endif
1064 #ifdef CONFIG_NUMA
1065         {
1066                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1067                 .procname       = "zone_reclaim_mode",
1068                 .data           = &zone_reclaim_mode,
1069                 .maxlen         = sizeof(zone_reclaim_mode),
1070                 .mode           = 0644,
1071                 .proc_handler   = &proc_dointvec,
1072                 .strategy       = &sysctl_intvec,
1073                 .extra1         = &zero,
1074         },
1075         {
1076                 .ctl_name       = VM_MIN_UNMAPPED,
1077                 .procname       = "min_unmapped_ratio",
1078                 .data           = &sysctl_min_unmapped_ratio,
1079                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1080                 .mode           = 0644,
1081                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1082                 .strategy       = &sysctl_intvec,
1083                 .extra1         = &zero,
1084                 .extra2         = &one_hundred,
1085         },
1086         {
1087                 .ctl_name       = VM_MIN_SLAB,
1088                 .procname       = "min_slab_ratio",
1089                 .data           = &sysctl_min_slab_ratio,
1090                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1091                 .mode           = 0644,
1092                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1093                 .strategy       = &sysctl_intvec,
1094                 .extra1         = &zero,
1095                 .extra2         = &one_hundred,
1096         },
1097 #endif
1098 #ifdef CONFIG_SMP
1099         {
1100                 .ctl_name       = CTL_UNNUMBERED,
1101                 .procname       = "stat_interval",
1102                 .data           = &sysctl_stat_interval,
1103                 .maxlen         = sizeof(sysctl_stat_interval),
1104                 .mode           = 0644,
1105                 .proc_handler   = &proc_dointvec_jiffies,
1106                 .strategy       = &sysctl_jiffies,
1107         },
1108 #endif
1109 #ifdef CONFIG_SECURITY
1110         {
1111                 .ctl_name       = CTL_UNNUMBERED,
1112                 .procname       = "mmap_min_addr",
1113                 .data           = &mmap_min_addr,
1114                 .maxlen         = sizeof(unsigned long),
1115                 .mode           = 0644,
1116                 .proc_handler   = &proc_doulongvec_minmax,
1117         },
1118 #endif
1119 #ifdef CONFIG_NUMA
1120         {
1121                 .ctl_name       = CTL_UNNUMBERED,
1122                 .procname       = "numa_zonelist_order",
1123                 .data           = &numa_zonelist_order,
1124                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1125                 .mode           = 0644,
1126                 .proc_handler   = &numa_zonelist_order_handler,
1127                 .strategy       = &sysctl_string,
1128         },
1129 #endif
1130 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1131    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1132         {
1133                 .ctl_name       = VM_VDSO_ENABLED,
1134                 .procname       = "vdso_enabled",
1135                 .data           = &vdso_enabled,
1136                 .maxlen         = sizeof(vdso_enabled),
1137                 .mode           = 0644,
1138                 .proc_handler   = &proc_dointvec,
1139                 .strategy       = &sysctl_intvec,
1140                 .extra1         = &zero,
1141         },
1142 #endif
1143 #ifdef CONFIG_HIGHMEM
1144         {
1145                 .ctl_name       = CTL_UNNUMBERED,
1146                 .procname       = "highmem_is_dirtyable",
1147                 .data           = &vm_highmem_is_dirtyable,
1148                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1149                 .mode           = 0644,
1150                 .proc_handler   = &proc_dointvec_minmax,
1151                 .strategy       = &sysctl_intvec,
1152                 .extra1         = &zero,
1153                 .extra2         = &one,
1154         },
1155 #endif
1156 /*
1157  * NOTE: do not add new entries to this table unless you have read
1158  * Documentation/sysctl/ctl_unnumbered.txt
1159  */
1160         { .ctl_name = 0 }
1161 };
1162
1163 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1164 static struct ctl_table binfmt_misc_table[] = {
1165         { .ctl_name = 0 }
1166 };
1167 #endif
1168
1169 static struct ctl_table fs_table[] = {
1170         {
1171                 .ctl_name       = FS_NRINODE,
1172                 .procname       = "inode-nr",
1173                 .data           = &inodes_stat,
1174                 .maxlen         = 2*sizeof(int),
1175                 .mode           = 0444,
1176                 .proc_handler   = &proc_dointvec,
1177         },
1178         {
1179                 .ctl_name       = FS_STATINODE,
1180                 .procname       = "inode-state",
1181                 .data           = &inodes_stat,
1182                 .maxlen         = 7*sizeof(int),
1183                 .mode           = 0444,
1184                 .proc_handler   = &proc_dointvec,
1185         },
1186         {
1187                 .procname       = "file-nr",
1188                 .data           = &files_stat,
1189                 .maxlen         = 3*sizeof(int),
1190                 .mode           = 0444,
1191                 .proc_handler   = &proc_nr_files,
1192         },
1193         {
1194                 .ctl_name       = FS_MAXFILE,
1195                 .procname       = "file-max",
1196                 .data           = &files_stat.max_files,
1197                 .maxlen         = sizeof(int),
1198                 .mode           = 0644,
1199                 .proc_handler   = &proc_dointvec,
1200         },
1201         {
1202                 .ctl_name       = CTL_UNNUMBERED,
1203                 .procname       = "nr_open",
1204                 .data           = &sysctl_nr_open,
1205                 .maxlen         = sizeof(int),
1206                 .mode           = 0644,
1207                 .proc_handler   = &proc_dointvec_minmax,
1208                 .extra1         = &sysctl_nr_open_min,
1209                 .extra2         = &sysctl_nr_open_max,
1210         },
1211         {
1212                 .ctl_name       = FS_DENTRY,
1213                 .procname       = "dentry-state",
1214                 .data           = &dentry_stat,
1215                 .maxlen         = 6*sizeof(int),
1216                 .mode           = 0444,
1217                 .proc_handler   = &proc_dointvec,
1218         },
1219         {
1220                 .ctl_name       = FS_OVERFLOWUID,
1221                 .procname       = "overflowuid",
1222                 .data           = &fs_overflowuid,
1223                 .maxlen         = sizeof(int),
1224                 .mode           = 0644,
1225                 .proc_handler   = &proc_dointvec_minmax,
1226                 .strategy       = &sysctl_intvec,
1227                 .extra1         = &minolduid,
1228                 .extra2         = &maxolduid,
1229         },
1230         {
1231                 .ctl_name       = FS_OVERFLOWGID,
1232                 .procname       = "overflowgid",
1233                 .data           = &fs_overflowgid,
1234                 .maxlen         = sizeof(int),
1235                 .mode           = 0644,
1236                 .proc_handler   = &proc_dointvec_minmax,
1237                 .strategy       = &sysctl_intvec,
1238                 .extra1         = &minolduid,
1239                 .extra2         = &maxolduid,
1240         },
1241         {
1242                 .ctl_name       = FS_LEASES,
1243                 .procname       = "leases-enable",
1244                 .data           = &leases_enable,
1245                 .maxlen         = sizeof(int),
1246                 .mode           = 0644,
1247                 .proc_handler   = &proc_dointvec,
1248         },
1249 #ifdef CONFIG_DNOTIFY
1250         {
1251                 .ctl_name       = FS_DIR_NOTIFY,
1252                 .procname       = "dir-notify-enable",
1253                 .data           = &dir_notify_enable,
1254                 .maxlen         = sizeof(int),
1255                 .mode           = 0644,
1256                 .proc_handler   = &proc_dointvec,
1257         },
1258 #endif
1259 #ifdef CONFIG_MMU
1260         {
1261                 .ctl_name       = FS_LEASE_TIME,
1262                 .procname       = "lease-break-time",
1263                 .data           = &lease_break_time,
1264                 .maxlen         = sizeof(int),
1265                 .mode           = 0644,
1266                 .proc_handler   = &proc_dointvec_minmax,
1267                 .strategy       = &sysctl_intvec,
1268                 .extra1         = &zero,
1269                 .extra2         = &two,
1270         },
1271         {
1272                 .procname       = "aio-nr",
1273                 .data           = &aio_nr,
1274                 .maxlen         = sizeof(aio_nr),
1275                 .mode           = 0444,
1276                 .proc_handler   = &proc_doulongvec_minmax,
1277         },
1278         {
1279                 .procname       = "aio-max-nr",
1280                 .data           = &aio_max_nr,
1281                 .maxlen         = sizeof(aio_max_nr),
1282                 .mode           = 0644,
1283                 .proc_handler   = &proc_doulongvec_minmax,
1284         },
1285 #ifdef CONFIG_INOTIFY_USER
1286         {
1287                 .ctl_name       = FS_INOTIFY,
1288                 .procname       = "inotify",
1289                 .mode           = 0555,
1290                 .child          = inotify_table,
1291         },
1292 #endif
1293 #endif
1294         {
1295                 .ctl_name       = KERN_SETUID_DUMPABLE,
1296                 .procname       = "suid_dumpable",
1297                 .data           = &suid_dumpable,
1298                 .maxlen         = sizeof(int),
1299                 .mode           = 0644,
1300                 .proc_handler   = &proc_dointvec,
1301         },
1302 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1303         {
1304                 .ctl_name       = CTL_UNNUMBERED,
1305                 .procname       = "binfmt_misc",
1306                 .mode           = 0555,
1307                 .child          = binfmt_misc_table,
1308         },
1309 #endif
1310 /*
1311  * NOTE: do not add new entries to this table unless you have read
1312  * Documentation/sysctl/ctl_unnumbered.txt
1313  */
1314         { .ctl_name = 0 }
1315 };
1316
1317 static struct ctl_table debug_table[] = {
1318 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1319         {
1320                 .ctl_name       = CTL_UNNUMBERED,
1321                 .procname       = "exception-trace",
1322                 .data           = &show_unhandled_signals,
1323                 .maxlen         = sizeof(int),
1324                 .mode           = 0644,
1325                 .proc_handler   = proc_dointvec
1326         },
1327 #endif
1328         { .ctl_name = 0 }
1329 };
1330
1331 static struct ctl_table dev_table[] = {
1332         { .ctl_name = 0 }
1333 };
1334
1335 static DEFINE_SPINLOCK(sysctl_lock);
1336
1337 /* called under sysctl_lock */
1338 static int use_table(struct ctl_table_header *p)
1339 {
1340         if (unlikely(p->unregistering))
1341                 return 0;
1342         p->used++;
1343         return 1;
1344 }
1345
1346 /* called under sysctl_lock */
1347 static void unuse_table(struct ctl_table_header *p)
1348 {
1349         if (!--p->used)
1350                 if (unlikely(p->unregistering))
1351                         complete(p->unregistering);
1352 }
1353
1354 /* called under sysctl_lock, will reacquire if has to wait */
1355 static void start_unregistering(struct ctl_table_header *p)
1356 {
1357         /*
1358          * if p->used is 0, nobody will ever touch that entry again;
1359          * we'll eliminate all paths to it before dropping sysctl_lock
1360          */
1361         if (unlikely(p->used)) {
1362                 struct completion wait;
1363                 init_completion(&wait);
1364                 p->unregistering = &wait;
1365                 spin_unlock(&sysctl_lock);
1366                 wait_for_completion(&wait);
1367                 spin_lock(&sysctl_lock);
1368         }
1369         /*
1370          * do not remove from the list until nobody holds it; walking the
1371          * list in do_sysctl() relies on that.
1372          */
1373         list_del_init(&p->ctl_entry);
1374 }
1375
1376 void sysctl_head_finish(struct ctl_table_header *head)
1377 {
1378         if (!head)
1379                 return;
1380         spin_lock(&sysctl_lock);
1381         unuse_table(head);
1382         spin_unlock(&sysctl_lock);
1383 }
1384
1385 static struct list_head *
1386 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1387 {
1388         struct list_head *header_list;
1389         header_list = &root->header_list;
1390         if (root->lookup)
1391                 header_list = root->lookup(root, namespaces);
1392         return header_list;
1393 }
1394
1395 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1396                                             struct ctl_table_header *prev)
1397 {
1398         struct ctl_table_root *root;
1399         struct list_head *header_list;
1400         struct ctl_table_header *head;
1401         struct list_head *tmp;
1402
1403         spin_lock(&sysctl_lock);
1404         if (prev) {
1405                 head = prev;
1406                 tmp = &prev->ctl_entry;
1407                 unuse_table(prev);
1408                 goto next;
1409         }
1410         tmp = &root_table_header.ctl_entry;
1411         for (;;) {
1412                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1413
1414                 if (!use_table(head))
1415                         goto next;
1416                 spin_unlock(&sysctl_lock);
1417                 return head;
1418         next:
1419                 root = head->root;
1420                 tmp = tmp->next;
1421                 header_list = lookup_header_list(root, namespaces);
1422                 if (tmp != header_list)
1423                         continue;
1424
1425                 do {
1426                         root = list_entry(root->root_list.next,
1427                                         struct ctl_table_root, root_list);
1428                         if (root == &sysctl_table_root)
1429                                 goto out;
1430                         header_list = lookup_header_list(root, namespaces);
1431                 } while (list_empty(header_list));
1432                 tmp = header_list->next;
1433         }
1434 out:
1435         spin_unlock(&sysctl_lock);
1436         return NULL;
1437 }
1438
1439 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1440 {
1441         return __sysctl_head_next(current->nsproxy, prev);
1442 }
1443
1444 void register_sysctl_root(struct ctl_table_root *root)
1445 {
1446         spin_lock(&sysctl_lock);
1447         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1448         spin_unlock(&sysctl_lock);
1449 }
1450
1451 #ifdef CONFIG_SYSCTL_SYSCALL
1452 /* Perform the actual read/write of a sysctl table entry. */
1453 static int do_sysctl_strategy(struct ctl_table_root *root,
1454                         struct ctl_table *table,
1455                         int __user *name, int nlen,
1456                         void __user *oldval, size_t __user *oldlenp,
1457                         void __user *newval, size_t newlen)
1458 {
1459         int op = 0, rc;
1460
1461         if (oldval)
1462                 op |= 004;
1463         if (newval)
1464                 op |= 002;
1465         if (sysctl_perm(root, table, op))
1466                 return -EPERM;
1467
1468         if (table->strategy) {
1469                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1470                                      newval, newlen);
1471                 if (rc < 0)
1472                         return rc;
1473                 if (rc > 0)
1474                         return 0;
1475         }
1476
1477         /* If there is no strategy routine, or if the strategy returns
1478          * zero, proceed with automatic r/w */
1479         if (table->data && table->maxlen) {
1480                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1481                                  newval, newlen);
1482                 if (rc < 0)
1483                         return rc;
1484         }
1485         return 0;
1486 }
1487
1488 static int parse_table(int __user *name, int nlen,
1489                        void __user *oldval, size_t __user *oldlenp,
1490                        void __user *newval, size_t newlen,
1491                        struct ctl_table_root *root,
1492                        struct ctl_table *table)
1493 {
1494         int n;
1495 repeat:
1496         if (!nlen)
1497                 return -ENOTDIR;
1498         if (get_user(n, name))
1499                 return -EFAULT;
1500         for ( ; table->ctl_name || table->procname; table++) {
1501                 if (!table->ctl_name)
1502                         continue;
1503                 if (n == table->ctl_name) {
1504                         int error;
1505                         if (table->child) {
1506                                 if (sysctl_perm(root, table, 001))
1507                                         return -EPERM;
1508                                 name++;
1509                                 nlen--;
1510                                 table = table->child;
1511                                 goto repeat;
1512                         }
1513                         error = do_sysctl_strategy(root, table, name, nlen,
1514                                                    oldval, oldlenp,
1515                                                    newval, newlen);
1516                         return error;
1517                 }
1518         }
1519         return -ENOTDIR;
1520 }
1521
1522 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1523                void __user *newval, size_t newlen)
1524 {
1525         struct ctl_table_header *head;
1526         int error = -ENOTDIR;
1527
1528         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1529                 return -ENOTDIR;
1530         if (oldval) {
1531                 int old_len;
1532                 if (!oldlenp || get_user(old_len, oldlenp))
1533                         return -EFAULT;
1534         }
1535
1536         for (head = sysctl_head_next(NULL); head;
1537                         head = sysctl_head_next(head)) {
1538                 error = parse_table(name, nlen, oldval, oldlenp,
1539                                         newval, newlen,
1540                                         head->root, head->ctl_table);
1541                 if (error != -ENOTDIR) {
1542                         sysctl_head_finish(head);
1543                         break;
1544                 }
1545         }
1546         return error;
1547 }
1548
1549 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1550 {
1551         struct __sysctl_args tmp;
1552         int error;
1553
1554         if (copy_from_user(&tmp, args, sizeof(tmp)))
1555                 return -EFAULT;
1556
1557         error = deprecated_sysctl_warning(&tmp);
1558         if (error)
1559                 goto out;
1560
1561         lock_kernel();
1562         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1563                           tmp.newval, tmp.newlen);
1564         unlock_kernel();
1565 out:
1566         return error;
1567 }
1568 #endif /* CONFIG_SYSCTL_SYSCALL */
1569
1570 /*
1571  * sysctl_perm does NOT grant the superuser all rights automatically, because
1572  * some sysctl variables are readonly even to root.
1573  */
1574
1575 static int test_perm(int mode, int op)
1576 {
1577         if (!current->euid)
1578                 mode >>= 6;
1579         else if (in_egroup_p(0))
1580                 mode >>= 3;
1581         if ((mode & op & 0007) == op)
1582                 return 0;
1583         return -EACCES;
1584 }
1585
1586 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1587 {
1588         int error;
1589         int mode;
1590
1591         error = security_sysctl(table, op);
1592         if (error)
1593                 return error;
1594
1595         if (root->permissions)
1596                 mode = root->permissions(root, current->nsproxy, table);
1597         else
1598                 mode = table->mode;
1599
1600         return test_perm(mode, op);
1601 }
1602
1603 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1604 {
1605         for (; table->ctl_name || table->procname; table++) {
1606                 table->parent = parent;
1607                 if (table->child)
1608                         sysctl_set_parent(table, table->child);
1609         }
1610 }
1611
1612 static __init int sysctl_init(void)
1613 {
1614         sysctl_set_parent(NULL, root_table);
1615 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1616         {
1617                 int err;
1618                 err = sysctl_check_table(current->nsproxy, root_table);
1619         }
1620 #endif
1621         return 0;
1622 }
1623
1624 core_initcall(sysctl_init);
1625
1626 /**
1627  * __register_sysctl_paths - register a sysctl hierarchy
1628  * @root: List of sysctl headers to register on
1629  * @namespaces: Data to compute which lists of sysctl entries are visible
1630  * @path: The path to the directory the sysctl table is in.
1631  * @table: the top-level table structure
1632  *
1633  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1634  * array. A completely 0 filled entry terminates the table.
1635  *
1636  * The members of the &struct ctl_table structure are used as follows:
1637  *
1638  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1639  *            must be unique within that level of sysctl
1640  *
1641  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1642  *            enter a sysctl file
1643  *
1644  * data - a pointer to data for use by proc_handler
1645  *
1646  * maxlen - the maximum size in bytes of the data
1647  *
1648  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1649  *
1650  * child - a pointer to the child sysctl table if this entry is a directory, or
1651  *         %NULL.
1652  *
1653  * proc_handler - the text handler routine (described below)
1654  *
1655  * strategy - the strategy routine (described below)
1656  *
1657  * de - for internal use by the sysctl routines
1658  *
1659  * extra1, extra2 - extra pointers usable by the proc handler routines
1660  *
1661  * Leaf nodes in the sysctl tree will be represented by a single file
1662  * under /proc; non-leaf nodes will be represented by directories.
1663  *
1664  * sysctl(2) can automatically manage read and write requests through
1665  * the sysctl table.  The data and maxlen fields of the ctl_table
1666  * struct enable minimal validation of the values being written to be
1667  * performed, and the mode field allows minimal authentication.
1668  *
1669  * More sophisticated management can be enabled by the provision of a
1670  * strategy routine with the table entry.  This will be called before
1671  * any automatic read or write of the data is performed.
1672  *
1673  * The strategy routine may return
1674  *
1675  * < 0 - Error occurred (error is passed to user process)
1676  *
1677  * 0   - OK - proceed with automatic read or write.
1678  *
1679  * > 0 - OK - read or write has been done by the strategy routine, so
1680  *       return immediately.
1681  *
1682  * There must be a proc_handler routine for any terminal nodes
1683  * mirrored under /proc/sys (non-terminals are handled by a built-in
1684  * directory handler).  Several default handlers are available to
1685  * cover common cases -
1686  *
1687  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1688  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1689  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1690  *
1691  * It is the handler's job to read the input buffer from user memory
1692  * and process it. The handler should return 0 on success.
1693  *
1694  * This routine returns %NULL on a failure to register, and a pointer
1695  * to the table header on success.
1696  */
1697 struct ctl_table_header *__register_sysctl_paths(
1698         struct ctl_table_root *root,
1699         struct nsproxy *namespaces,
1700         const struct ctl_path *path, struct ctl_table *table)
1701 {
1702         struct list_head *header_list;
1703         struct ctl_table_header *header;
1704         struct ctl_table *new, **prevp;
1705         unsigned int n, npath;
1706
1707         /* Count the path components */
1708         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1709                 ;
1710
1711         /*
1712          * For each path component, allocate a 2-element ctl_table array.
1713          * The first array element will be filled with the sysctl entry
1714          * for this, the second will be the sentinel (ctl_name == 0).
1715          *
1716          * We allocate everything in one go so that we don't have to
1717          * worry about freeing additional memory in unregister_sysctl_table.
1718          */
1719         header = kzalloc(sizeof(struct ctl_table_header) +
1720                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1721         if (!header)
1722                 return NULL;
1723
1724         new = (struct ctl_table *) (header + 1);
1725
1726         /* Now connect the dots */
1727         prevp = &header->ctl_table;
1728         for (n = 0; n < npath; ++n, ++path) {
1729                 /* Copy the procname */
1730                 new->procname = path->procname;
1731                 new->ctl_name = path->ctl_name;
1732                 new->mode     = 0555;
1733
1734                 *prevp = new;
1735                 prevp = &new->child;
1736
1737                 new += 2;
1738         }
1739         *prevp = table;
1740         header->ctl_table_arg = table;
1741
1742         INIT_LIST_HEAD(&header->ctl_entry);
1743         header->used = 0;
1744         header->unregistering = NULL;
1745         header->root = root;
1746         sysctl_set_parent(NULL, header->ctl_table);
1747 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1748         if (sysctl_check_table(namespaces, header->ctl_table)) {
1749                 kfree(header);
1750                 return NULL;
1751         }
1752 #endif
1753         spin_lock(&sysctl_lock);
1754         header_list = lookup_header_list(root, namespaces);
1755         list_add_tail(&header->ctl_entry, header_list);
1756         spin_unlock(&sysctl_lock);
1757
1758         return header;
1759 }
1760
1761 /**
1762  * register_sysctl_table_path - register a sysctl table hierarchy
1763  * @path: The path to the directory the sysctl table is in.
1764  * @table: the top-level table structure
1765  *
1766  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1767  * array. A completely 0 filled entry terminates the table.
1768  *
1769  * See __register_sysctl_paths for more details.
1770  */
1771 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1772                                                 struct ctl_table *table)
1773 {
1774         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1775                                         path, table);
1776 }
1777
1778 /**
1779  * register_sysctl_table - register a sysctl table hierarchy
1780  * @table: the top-level table structure
1781  *
1782  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1783  * array. A completely 0 filled entry terminates the table.
1784  *
1785  * See register_sysctl_paths for more details.
1786  */
1787 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1788 {
1789         static const struct ctl_path null_path[] = { {} };
1790
1791         return register_sysctl_paths(null_path, table);
1792 }
1793
1794 /**
1795  * unregister_sysctl_table - unregister a sysctl table hierarchy
1796  * @header: the header returned from register_sysctl_table
1797  *
1798  * Unregisters the sysctl table and all children. proc entries may not
1799  * actually be removed until they are no longer used by anyone.
1800  */
1801 void unregister_sysctl_table(struct ctl_table_header * header)
1802 {
1803         might_sleep();
1804
1805         if (header == NULL)
1806                 return;
1807
1808         spin_lock(&sysctl_lock);
1809         start_unregistering(header);
1810         spin_unlock(&sysctl_lock);
1811         kfree(header);
1812 }
1813
1814 #else /* !CONFIG_SYSCTL */
1815 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1816 {
1817         return NULL;
1818 }
1819
1820 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1821                                                     struct ctl_table *table)
1822 {
1823         return NULL;
1824 }
1825
1826 void unregister_sysctl_table(struct ctl_table_header * table)
1827 {
1828 }
1829
1830 #endif /* CONFIG_SYSCTL */
1831
1832 /*
1833  * /proc/sys support
1834  */
1835
1836 #ifdef CONFIG_PROC_SYSCTL
1837
1838 static int _proc_do_string(void* data, int maxlen, int write,
1839                            struct file *filp, void __user *buffer,
1840                            size_t *lenp, loff_t *ppos)
1841 {
1842         size_t len;
1843         char __user *p;
1844         char c;
1845
1846         if (!data || !maxlen || !*lenp) {
1847                 *lenp = 0;
1848                 return 0;
1849         }
1850
1851         if (write) {
1852                 len = 0;
1853                 p = buffer;
1854                 while (len < *lenp) {
1855                         if (get_user(c, p++))
1856                                 return -EFAULT;
1857                         if (c == 0 || c == '\n')
1858                                 break;
1859                         len++;
1860                 }
1861                 if (len >= maxlen)
1862                         len = maxlen-1;
1863                 if(copy_from_user(data, buffer, len))
1864                         return -EFAULT;
1865                 ((char *) data)[len] = 0;
1866                 *ppos += *lenp;
1867         } else {
1868                 len = strlen(data);
1869                 if (len > maxlen)
1870                         len = maxlen;
1871
1872                 if (*ppos > len) {
1873                         *lenp = 0;
1874                         return 0;
1875                 }
1876
1877                 data += *ppos;
1878                 len  -= *ppos;
1879
1880                 if (len > *lenp)
1881                         len = *lenp;
1882                 if (len)
1883                         if(copy_to_user(buffer, data, len))
1884                                 return -EFAULT;
1885                 if (len < *lenp) {
1886                         if(put_user('\n', ((char __user *) buffer) + len))
1887                                 return -EFAULT;
1888                         len++;
1889                 }
1890                 *lenp = len;
1891                 *ppos += len;
1892         }
1893         return 0;
1894 }
1895
1896 /**
1897  * proc_dostring - read a string sysctl
1898  * @table: the sysctl table
1899  * @write: %TRUE if this is a write to the sysctl file
1900  * @filp: the file structure
1901  * @buffer: the user buffer
1902  * @lenp: the size of the user buffer
1903  * @ppos: file position
1904  *
1905  * Reads/writes a string from/to the user buffer. If the kernel
1906  * buffer provided is not large enough to hold the string, the
1907  * string is truncated. The copied string is %NULL-terminated.
1908  * If the string is being read by the user process, it is copied
1909  * and a newline '\n' is added. It is truncated if the buffer is
1910  * not large enough.
1911  *
1912  * Returns 0 on success.
1913  */
1914 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1915                   void __user *buffer, size_t *lenp, loff_t *ppos)
1916 {
1917         return _proc_do_string(table->data, table->maxlen, write, filp,
1918                                buffer, lenp, ppos);
1919 }
1920
1921
1922 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1923                                  int *valp,
1924                                  int write, void *data)
1925 {
1926         if (write) {
1927                 *valp = *negp ? -*lvalp : *lvalp;
1928         } else {
1929                 int val = *valp;
1930                 if (val < 0) {
1931                         *negp = -1;
1932                         *lvalp = (unsigned long)-val;
1933                 } else {
1934                         *negp = 0;
1935                         *lvalp = (unsigned long)val;
1936                 }
1937         }
1938         return 0;
1939 }
1940
1941 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1942                   int write, struct file *filp, void __user *buffer,
1943                   size_t *lenp, loff_t *ppos,
1944                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1945                               int write, void *data),
1946                   void *data)
1947 {
1948 #define TMPBUFLEN 21
1949         int *i, vleft, first=1, neg, val;
1950         unsigned long lval;
1951         size_t left, len;
1952
1953         char buf[TMPBUFLEN], *p;
1954         char __user *s = buffer;
1955
1956         if (!tbl_data || !table->maxlen || !*lenp ||
1957             (*ppos && !write)) {
1958                 *lenp = 0;
1959                 return 0;
1960         }
1961
1962         i = (int *) tbl_data;
1963         vleft = table->maxlen / sizeof(*i);
1964         left = *lenp;
1965
1966         if (!conv)
1967                 conv = do_proc_dointvec_conv;
1968
1969         for (; left && vleft--; i++, first=0) {
1970                 if (write) {
1971                         while (left) {
1972                                 char c;
1973                                 if (get_user(c, s))
1974                                         return -EFAULT;
1975                                 if (!isspace(c))
1976                                         break;
1977                                 left--;
1978                                 s++;
1979                         }
1980                         if (!left)
1981                                 break;
1982                         neg = 0;
1983                         len = left;
1984                         if (len > sizeof(buf) - 1)
1985                                 len = sizeof(buf) - 1;
1986                         if (copy_from_user(buf, s, len))
1987                                 return -EFAULT;
1988                         buf[len] = 0;
1989                         p = buf;
1990                         if (*p == '-' && left > 1) {
1991                                 neg = 1;
1992                                 p++;
1993                         }
1994                         if (*p < '0' || *p > '9')
1995                                 break;
1996
1997                         lval = simple_strtoul(p, &p, 0);
1998
1999                         len = p-buf;
2000                         if ((len < left) && *p && !isspace(*p))
2001                                 break;
2002                         if (neg)
2003                                 val = -val;
2004                         s += len;
2005                         left -= len;
2006
2007                         if (conv(&neg, &lval, i, 1, data))
2008                                 break;
2009                 } else {
2010                         p = buf;
2011                         if (!first)
2012                                 *p++ = '\t';
2013
2014                         if (conv(&neg, &lval, i, 0, data))
2015                                 break;
2016
2017                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2018                         len = strlen(buf);
2019                         if (len > left)
2020                                 len = left;
2021                         if(copy_to_user(s, buf, len))
2022                                 return -EFAULT;
2023                         left -= len;
2024                         s += len;
2025                 }
2026         }
2027
2028         if (!write && !first && left) {
2029                 if(put_user('\n', s))
2030                         return -EFAULT;
2031                 left--, s++;
2032         }
2033         if (write) {
2034                 while (left) {
2035                         char c;
2036                         if (get_user(c, s++))
2037                                 return -EFAULT;
2038                         if (!isspace(c))
2039                                 break;
2040                         left--;
2041                 }
2042         }
2043         if (write && first)
2044                 return -EINVAL;
2045         *lenp -= left;
2046         *ppos += *lenp;
2047         return 0;
2048 #undef TMPBUFLEN
2049 }
2050
2051 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2052                   void __user *buffer, size_t *lenp, loff_t *ppos,
2053                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2054                               int write, void *data),
2055                   void *data)
2056 {
2057         return __do_proc_dointvec(table->data, table, write, filp,
2058                         buffer, lenp, ppos, conv, data);
2059 }
2060
2061 /**
2062  * proc_dointvec - read a vector of integers
2063  * @table: the sysctl table
2064  * @write: %TRUE if this is a write to the sysctl file
2065  * @filp: the file structure
2066  * @buffer: the user buffer
2067  * @lenp: the size of the user buffer
2068  * @ppos: file position
2069  *
2070  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2071  * values from/to the user buffer, treated as an ASCII string.
2072  *
2073  * Returns 0 on success.
2074  */
2075 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2076                      void __user *buffer, size_t *lenp, loff_t *ppos)
2077 {
2078     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2079                             NULL,NULL);
2080 }
2081
2082 #define OP_SET  0
2083 #define OP_AND  1
2084 #define OP_OR   2
2085
2086 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2087                                       int *valp,
2088                                       int write, void *data)
2089 {
2090         int op = *(int *)data;
2091         if (write) {
2092                 int val = *negp ? -*lvalp : *lvalp;
2093                 switch(op) {
2094                 case OP_SET:    *valp = val; break;
2095                 case OP_AND:    *valp &= val; break;
2096                 case OP_OR:     *valp |= val; break;
2097                 }
2098         } else {
2099                 int val = *valp;
2100                 if (val < 0) {
2101                         *negp = -1;
2102                         *lvalp = (unsigned long)-val;
2103                 } else {
2104                         *negp = 0;
2105                         *lvalp = (unsigned long)val;
2106                 }
2107         }
2108         return 0;
2109 }
2110
2111 /*
2112  *      Taint values can only be increased
2113  */
2114 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2115                                void __user *buffer, size_t *lenp, loff_t *ppos)
2116 {
2117         int op;
2118
2119         if (write && !capable(CAP_SYS_ADMIN))
2120                 return -EPERM;
2121
2122         op = OP_OR;
2123         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2124                                 do_proc_dointvec_bset_conv,&op);
2125 }
2126
2127 struct do_proc_dointvec_minmax_conv_param {
2128         int *min;
2129         int *max;
2130 };
2131
2132 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2133                                         int *valp,
2134                                         int write, void *data)
2135 {
2136         struct do_proc_dointvec_minmax_conv_param *param = data;
2137         if (write) {
2138                 int val = *negp ? -*lvalp : *lvalp;
2139                 if ((param->min && *param->min > val) ||
2140                     (param->max && *param->max < val))
2141                         return -EINVAL;
2142                 *valp = val;
2143         } else {
2144                 int val = *valp;
2145                 if (val < 0) {
2146                         *negp = -1;
2147                         *lvalp = (unsigned long)-val;
2148                 } else {
2149                         *negp = 0;
2150                         *lvalp = (unsigned long)val;
2151                 }
2152         }
2153         return 0;
2154 }
2155
2156 /**
2157  * proc_dointvec_minmax - read a vector of integers with min/max values
2158  * @table: the sysctl table
2159  * @write: %TRUE if this is a write to the sysctl file
2160  * @filp: the file structure
2161  * @buffer: the user buffer
2162  * @lenp: the size of the user buffer
2163  * @ppos: file position
2164  *
2165  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2166  * values from/to the user buffer, treated as an ASCII string.
2167  *
2168  * This routine will ensure the values are within the range specified by
2169  * table->extra1 (min) and table->extra2 (max).
2170  *
2171  * Returns 0 on success.
2172  */
2173 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2174                   void __user *buffer, size_t *lenp, loff_t *ppos)
2175 {
2176         struct do_proc_dointvec_minmax_conv_param param = {
2177                 .min = (int *) table->extra1,
2178                 .max = (int *) table->extra2,
2179         };
2180         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2181                                 do_proc_dointvec_minmax_conv, &param);
2182 }
2183
2184 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2185                                      struct file *filp,
2186                                      void __user *buffer,
2187                                      size_t *lenp, loff_t *ppos,
2188                                      unsigned long convmul,
2189                                      unsigned long convdiv)
2190 {
2191 #define TMPBUFLEN 21
2192         unsigned long *i, *min, *max, val;
2193         int vleft, first=1, neg;
2194         size_t len, left;
2195         char buf[TMPBUFLEN], *p;
2196         char __user *s = buffer;
2197
2198         if (!data || !table->maxlen || !*lenp ||
2199             (*ppos && !write)) {
2200                 *lenp = 0;
2201                 return 0;
2202         }
2203
2204         i = (unsigned long *) data;
2205         min = (unsigned long *) table->extra1;
2206         max = (unsigned long *) table->extra2;
2207         vleft = table->maxlen / sizeof(unsigned long);
2208         left = *lenp;
2209
2210         for (; left && vleft--; i++, min++, max++, first=0) {
2211                 if (write) {
2212                         while (left) {
2213                                 char c;
2214                                 if (get_user(c, s))
2215                                         return -EFAULT;
2216                                 if (!isspace(c))
2217                                         break;
2218                                 left--;
2219                                 s++;
2220                         }
2221                         if (!left)
2222                                 break;
2223                         neg = 0;
2224                         len = left;
2225                         if (len > TMPBUFLEN-1)
2226                                 len = TMPBUFLEN-1;
2227                         if (copy_from_user(buf, s, len))
2228                                 return -EFAULT;
2229                         buf[len] = 0;
2230                         p = buf;
2231                         if (*p == '-' && left > 1) {
2232                                 neg = 1;
2233                                 p++;
2234                         }
2235                         if (*p < '0' || *p > '9')
2236                                 break;
2237                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2238                         len = p-buf;
2239                         if ((len < left) && *p && !isspace(*p))
2240                                 break;
2241                         if (neg)
2242                                 val = -val;
2243                         s += len;
2244                         left -= len;
2245
2246                         if(neg)
2247                                 continue;
2248                         if ((min && val < *min) || (max && val > *max))
2249                                 continue;
2250                         *i = val;
2251                 } else {
2252                         p = buf;
2253                         if (!first)
2254                                 *p++ = '\t';
2255                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2256                         len = strlen(buf);
2257                         if (len > left)
2258                                 len = left;
2259                         if(copy_to_user(s, buf, len))
2260                                 return -EFAULT;
2261                         left -= len;
2262                         s += len;
2263                 }
2264         }
2265
2266         if (!write && !first && left) {
2267                 if(put_user('\n', s))
2268                         return -EFAULT;
2269                 left--, s++;
2270         }
2271         if (write) {
2272                 while (left) {
2273                         char c;
2274                         if (get_user(c, s++))
2275                                 return -EFAULT;
2276                         if (!isspace(c))
2277                                 break;
2278                         left--;
2279                 }
2280         }
2281         if (write && first)
2282                 return -EINVAL;
2283         *lenp -= left;
2284         *ppos += *lenp;
2285         return 0;
2286 #undef TMPBUFLEN
2287 }
2288
2289 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2290                                      struct file *filp,
2291                                      void __user *buffer,
2292                                      size_t *lenp, loff_t *ppos,
2293                                      unsigned long convmul,
2294                                      unsigned long convdiv)
2295 {
2296         return __do_proc_doulongvec_minmax(table->data, table, write,
2297                         filp, buffer, lenp, ppos, convmul, convdiv);
2298 }
2299
2300 /**
2301  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2302  * @table: the sysctl table
2303  * @write: %TRUE if this is a write to the sysctl file
2304  * @filp: the file structure
2305  * @buffer: the user buffer
2306  * @lenp: the size of the user buffer
2307  * @ppos: file position
2308  *
2309  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2310  * values from/to the user buffer, treated as an ASCII string.
2311  *
2312  * This routine will ensure the values are within the range specified by
2313  * table->extra1 (min) and table->extra2 (max).
2314  *
2315  * Returns 0 on success.
2316  */
2317 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2318                            void __user *buffer, size_t *lenp, loff_t *ppos)
2319 {
2320     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2321 }
2322
2323 /**
2324  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2325  * @table: the sysctl table
2326  * @write: %TRUE if this is a write to the sysctl file
2327  * @filp: the file structure
2328  * @buffer: the user buffer
2329  * @lenp: the size of the user buffer
2330  * @ppos: file position
2331  *
2332  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2333  * values from/to the user buffer, treated as an ASCII string. The values
2334  * are treated as milliseconds, and converted to jiffies when they are stored.
2335  *
2336  * This routine will ensure the values are within the range specified by
2337  * table->extra1 (min) and table->extra2 (max).
2338  *
2339  * Returns 0 on success.
2340  */
2341 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2342                                       struct file *filp,
2343                                       void __user *buffer,
2344                                       size_t *lenp, loff_t *ppos)
2345 {
2346     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2347                                      lenp, ppos, HZ, 1000l);
2348 }
2349
2350
2351 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2352                                          int *valp,
2353                                          int write, void *data)
2354 {
2355         if (write) {
2356                 if (*lvalp > LONG_MAX / HZ)
2357                         return 1;
2358                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2359         } else {
2360                 int val = *valp;
2361                 unsigned long lval;
2362                 if (val < 0) {
2363                         *negp = -1;
2364                         lval = (unsigned long)-val;
2365                 } else {
2366                         *negp = 0;
2367                         lval = (unsigned long)val;
2368                 }
2369                 *lvalp = lval / HZ;
2370         }
2371         return 0;
2372 }
2373
2374 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2375                                                 int *valp,
2376                                                 int write, void *data)
2377 {
2378         if (write) {
2379                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2380                         return 1;
2381                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2382         } else {
2383                 int val = *valp;
2384                 unsigned long lval;
2385                 if (val < 0) {
2386                         *negp = -1;
2387                         lval = (unsigned long)-val;
2388                 } else {
2389                         *negp = 0;
2390                         lval = (unsigned long)val;
2391                 }
2392                 *lvalp = jiffies_to_clock_t(lval);
2393         }
2394         return 0;
2395 }
2396
2397 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2398                                             int *valp,
2399                                             int write, void *data)
2400 {
2401         if (write) {
2402                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2403         } else {
2404                 int val = *valp;
2405                 unsigned long lval;
2406                 if (val < 0) {
2407                         *negp = -1;
2408                         lval = (unsigned long)-val;
2409                 } else {
2410                         *negp = 0;
2411                         lval = (unsigned long)val;
2412                 }
2413                 *lvalp = jiffies_to_msecs(lval);
2414         }
2415         return 0;
2416 }
2417
2418 /**
2419  * proc_dointvec_jiffies - read a vector of integers as seconds
2420  * @table: the sysctl table
2421  * @write: %TRUE if this is a write to the sysctl file
2422  * @filp: the file structure
2423  * @buffer: the user buffer
2424  * @lenp: the size of the user buffer
2425  * @ppos: file position
2426  *
2427  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2428  * values from/to the user buffer, treated as an ASCII string.
2429  * The values read are assumed to be in seconds, and are converted into
2430  * jiffies.
2431  *
2432  * Returns 0 on success.
2433  */
2434 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2435                           void __user *buffer, size_t *lenp, loff_t *ppos)
2436 {
2437     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2438                             do_proc_dointvec_jiffies_conv,NULL);
2439 }
2440
2441 /**
2442  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2443  * @table: the sysctl table
2444  * @write: %TRUE if this is a write to the sysctl file
2445  * @filp: the file structure
2446  * @buffer: the user buffer
2447  * @lenp: the size of the user buffer
2448  * @ppos: pointer to the file position
2449  *
2450  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2451  * values from/to the user buffer, treated as an ASCII string.
2452  * The values read are assumed to be in 1/USER_HZ seconds, and
2453  * are converted into jiffies.
2454  *
2455  * Returns 0 on success.
2456  */
2457 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2458                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2459 {
2460     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2461                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2462 }
2463
2464 /**
2465  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2466  * @table: the sysctl table
2467  * @write: %TRUE if this is a write to the sysctl file
2468  * @filp: the file structure
2469  * @buffer: the user buffer
2470  * @lenp: the size of the user buffer
2471  * @ppos: file position
2472  * @ppos: the current position in the file
2473  *
2474  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2475  * values from/to the user buffer, treated as an ASCII string.
2476  * The values read are assumed to be in 1/1000 seconds, and
2477  * are converted into jiffies.
2478  *
2479  * Returns 0 on success.
2480  */
2481 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2482                              void __user *buffer, size_t *lenp, loff_t *ppos)
2483 {
2484         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2485                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2486 }
2487
2488 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2489                            void __user *buffer, size_t *lenp, loff_t *ppos)
2490 {
2491         struct pid *new_pid;
2492         pid_t tmp;
2493         int r;
2494
2495         tmp = pid_vnr(cad_pid);
2496
2497         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2498                                lenp, ppos, NULL, NULL);
2499         if (r || !write)
2500                 return r;
2501
2502         new_pid = find_get_pid(tmp);
2503         if (!new_pid)
2504                 return -ESRCH;
2505
2506         put_pid(xchg(&cad_pid, new_pid));
2507         return 0;
2508 }
2509
2510 #else /* CONFIG_PROC_FS */
2511
2512 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2513                   void __user *buffer, size_t *lenp, loff_t *ppos)
2514 {
2515         return -ENOSYS;
2516 }
2517
2518 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2519                   void __user *buffer, size_t *lenp, loff_t *ppos)
2520 {
2521         return -ENOSYS;
2522 }
2523
2524 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2525                     void __user *buffer, size_t *lenp, loff_t *ppos)
2526 {
2527         return -ENOSYS;
2528 }
2529
2530 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2531                     void __user *buffer, size_t *lenp, loff_t *ppos)
2532 {
2533         return -ENOSYS;
2534 }
2535
2536 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2537                     void __user *buffer, size_t *lenp, loff_t *ppos)
2538 {
2539         return -ENOSYS;
2540 }
2541
2542 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2543                              void __user *buffer, size_t *lenp, loff_t *ppos)
2544 {
2545         return -ENOSYS;
2546 }
2547
2548 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2549                     void __user *buffer, size_t *lenp, loff_t *ppos)
2550 {
2551         return -ENOSYS;
2552 }
2553
2554 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2555                                       struct file *filp,
2556                                       void __user *buffer,
2557                                       size_t *lenp, loff_t *ppos)
2558 {
2559     return -ENOSYS;
2560 }
2561
2562
2563 #endif /* CONFIG_PROC_FS */
2564
2565
2566 #ifdef CONFIG_SYSCTL_SYSCALL
2567 /*
2568  * General sysctl support routines
2569  */
2570
2571 /* The generic sysctl data routine (used if no strategy routine supplied) */
2572 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2573                 void __user *oldval, size_t __user *oldlenp,
2574                 void __user *newval, size_t newlen)
2575 {
2576         size_t len;
2577
2578         /* Get out of I don't have a variable */
2579         if (!table->data || !table->maxlen)
2580                 return -ENOTDIR;
2581
2582         if (oldval && oldlenp) {
2583                 if (get_user(len, oldlenp))
2584                         return -EFAULT;
2585                 if (len) {
2586                         if (len > table->maxlen)
2587                                 len = table->maxlen;
2588                         if (copy_to_user(oldval, table->data, len))
2589                                 return -EFAULT;
2590                         if (put_user(len, oldlenp))
2591                                 return -EFAULT;
2592                 }
2593         }
2594
2595         if (newval && newlen) {
2596                 if (newlen > table->maxlen)
2597                         newlen = table->maxlen;
2598
2599                 if (copy_from_user(table->data, newval, newlen))
2600                         return -EFAULT;
2601         }
2602         return 1;
2603 }
2604
2605 /* The generic string strategy routine: */
2606 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2607                   void __user *oldval, size_t __user *oldlenp,
2608                   void __user *newval, size_t newlen)
2609 {
2610         if (!table->data || !table->maxlen)
2611                 return -ENOTDIR;
2612
2613         if (oldval && oldlenp) {
2614                 size_t bufsize;
2615                 if (get_user(bufsize, oldlenp))
2616                         return -EFAULT;
2617                 if (bufsize) {
2618                         size_t len = strlen(table->data), copied;
2619
2620                         /* This shouldn't trigger for a well-formed sysctl */
2621                         if (len > table->maxlen)
2622                                 len = table->maxlen;
2623
2624                         /* Copy up to a max of bufsize-1 bytes of the string */
2625                         copied = (len >= bufsize) ? bufsize - 1 : len;
2626
2627                         if (copy_to_user(oldval, table->data, copied) ||
2628                             put_user(0, (char __user *)(oldval + copied)))
2629                                 return -EFAULT;
2630                         if (put_user(len, oldlenp))
2631                                 return -EFAULT;
2632                 }
2633         }
2634         if (newval && newlen) {
2635                 size_t len = newlen;
2636                 if (len > table->maxlen)
2637                         len = table->maxlen;
2638                 if(copy_from_user(table->data, newval, len))
2639                         return -EFAULT;
2640                 if (len == table->maxlen)
2641                         len--;
2642                 ((char *) table->data)[len] = 0;
2643         }
2644         return 1;
2645 }
2646
2647 /*
2648  * This function makes sure that all of the integers in the vector
2649  * are between the minimum and maximum values given in the arrays
2650  * table->extra1 and table->extra2, respectively.
2651  */
2652 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2653                 void __user *oldval, size_t __user *oldlenp,
2654                 void __user *newval, size_t newlen)
2655 {
2656
2657         if (newval && newlen) {
2658                 int __user *vec = (int __user *) newval;
2659                 int *min = (int *) table->extra1;
2660                 int *max = (int *) table->extra2;
2661                 size_t length;
2662                 int i;
2663
2664                 if (newlen % sizeof(int) != 0)
2665                         return -EINVAL;
2666
2667                 if (!table->extra1 && !table->extra2)
2668                         return 0;
2669
2670                 if (newlen > table->maxlen)
2671                         newlen = table->maxlen;
2672                 length = newlen / sizeof(int);
2673
2674                 for (i = 0; i < length; i++) {
2675                         int value;
2676                         if (get_user(value, vec + i))
2677                                 return -EFAULT;
2678                         if (min && value < min[i])
2679                                 return -EINVAL;
2680                         if (max && value > max[i])
2681                                 return -EINVAL;
2682                 }
2683         }
2684         return 0;
2685 }
2686
2687 /* Strategy function to convert jiffies to seconds */
2688 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2689                 void __user *oldval, size_t __user *oldlenp,
2690                 void __user *newval, size_t newlen)
2691 {
2692         if (oldval && oldlenp) {
2693                 size_t olen;
2694
2695                 if (get_user(olen, oldlenp))
2696                         return -EFAULT;
2697                 if (olen) {
2698                         int val;
2699
2700                         if (olen < sizeof(int))
2701                                 return -EINVAL;
2702
2703                         val = *(int *)(table->data) / HZ;
2704                         if (put_user(val, (int __user *)oldval))
2705                                 return -EFAULT;
2706                         if (put_user(sizeof(int), oldlenp))
2707                                 return -EFAULT;
2708                 }
2709         }
2710         if (newval && newlen) {
2711                 int new;
2712                 if (newlen != sizeof(int))
2713                         return -EINVAL;
2714                 if (get_user(new, (int __user *)newval))
2715                         return -EFAULT;
2716                 *(int *)(table->data) = new*HZ;
2717         }
2718         return 1;
2719 }
2720
2721 /* Strategy function to convert jiffies to seconds */
2722 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2723                 void __user *oldval, size_t __user *oldlenp,
2724                 void __user *newval, size_t newlen)
2725 {
2726         if (oldval && oldlenp) {
2727                 size_t olen;
2728
2729                 if (get_user(olen, oldlenp))
2730                         return -EFAULT;
2731                 if (olen) {
2732                         int val;
2733
2734                         if (olen < sizeof(int))
2735                                 return -EINVAL;
2736
2737                         val = jiffies_to_msecs(*(int *)(table->data));
2738                         if (put_user(val, (int __user *)oldval))
2739                                 return -EFAULT;
2740                         if (put_user(sizeof(int), oldlenp))
2741                                 return -EFAULT;
2742                 }
2743         }
2744         if (newval && newlen) {
2745                 int new;
2746                 if (newlen != sizeof(int))
2747                         return -EINVAL;
2748                 if (get_user(new, (int __user *)newval))
2749                         return -EFAULT;
2750                 *(int *)(table->data) = msecs_to_jiffies(new);
2751         }
2752         return 1;
2753 }
2754
2755
2756
2757 #else /* CONFIG_SYSCTL_SYSCALL */
2758
2759
2760 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2761 {
2762         struct __sysctl_args tmp;
2763         int error;
2764
2765         if (copy_from_user(&tmp, args, sizeof(tmp)))
2766                 return -EFAULT;
2767
2768         error = deprecated_sysctl_warning(&tmp);
2769
2770         /* If no error reading the parameters then just -ENOSYS ... */
2771         if (!error)
2772                 error = -ENOSYS;
2773
2774         return error;
2775 }
2776
2777 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2778                   void __user *oldval, size_t __user *oldlenp,
2779                   void __user *newval, size_t newlen)
2780 {
2781         return -ENOSYS;
2782 }
2783
2784 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2785                   void __user *oldval, size_t __user *oldlenp,
2786                   void __user *newval, size_t newlen)
2787 {
2788         return -ENOSYS;
2789 }
2790
2791 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2792                 void __user *oldval, size_t __user *oldlenp,
2793                 void __user *newval, size_t newlen)
2794 {
2795         return -ENOSYS;
2796 }
2797
2798 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2799                 void __user *oldval, size_t __user *oldlenp,
2800                 void __user *newval, size_t newlen)
2801 {
2802         return -ENOSYS;
2803 }
2804
2805 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2806                 void __user *oldval, size_t __user *oldlenp,
2807                 void __user *newval, size_t newlen)
2808 {
2809         return -ENOSYS;
2810 }
2811
2812 #endif /* CONFIG_SYSCTL_SYSCALL */
2813
2814 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2815 {
2816         static int msg_count;
2817         int name[CTL_MAXNAME];
2818         int i;
2819
2820         /* Check args->nlen. */
2821         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2822                 return -ENOTDIR;
2823
2824         /* Read in the sysctl name for better debug message logging */
2825         for (i = 0; i < args->nlen; i++)
2826                 if (get_user(name[i], args->name + i))
2827                         return -EFAULT;
2828
2829         /* Ignore accesses to kernel.version */
2830         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2831                 return 0;
2832
2833         if (msg_count < 5) {
2834                 msg_count++;
2835                 printk(KERN_INFO
2836                         "warning: process `%s' used the deprecated sysctl "
2837                         "system call with ", current->comm);
2838                 for (i = 0; i < args->nlen; i++)
2839                         printk("%d.", name[i]);
2840                 printk("\n");
2841         }
2842         return 0;
2843 }
2844
2845 /*
2846  * No sense putting this after each symbol definition, twice,
2847  * exception granted :-)
2848  */
2849 EXPORT_SYMBOL(proc_dointvec);
2850 EXPORT_SYMBOL(proc_dointvec_jiffies);
2851 EXPORT_SYMBOL(proc_dointvec_minmax);
2852 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2853 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2854 EXPORT_SYMBOL(proc_dostring);
2855 EXPORT_SYMBOL(proc_doulongvec_minmax);
2856 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2857 EXPORT_SYMBOL(register_sysctl_table);
2858 EXPORT_SYMBOL(register_sysctl_paths);
2859 EXPORT_SYMBOL(sysctl_intvec);
2860 EXPORT_SYMBOL(sysctl_jiffies);
2861 EXPORT_SYMBOL(sysctl_ms_jiffies);
2862 EXPORT_SYMBOL(sysctl_string);
2863 EXPORT_SYMBOL(sysctl_data);
2864 EXPORT_SYMBOL(unregister_sysctl_table);