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

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/times.h>
  42 #include <linux/limits.h>
  43 #include <linux/dcache.h>
  44 #include <linux/syscalls.h>
  45 #include <linux/nfs_fs.h>
  46 #include <linux/acpi.h>
  47 #include <linux/reboot.h>
  48
  49 #include <asm/uaccess.h>
  50 #include <asm/processor.h>
  51
  52 #ifdef CONFIG_X86
  53 #include <asm/nmi.h>
  54 #include <asm/stacktrace.h>
  55 #include <asm/io.h>
  56 #endif
  57
  58 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  59
  60 #if defined(CONFIG_SYSCTL)
  61
  62 /* External variables not in a header file. */
  63 extern int C_A_D;
  64 extern int print_fatal_signals;
  65 extern int sysctl_overcommit_memory;
  66 extern int sysctl_overcommit_ratio;
  67 extern int sysctl_panic_on_oom;
  68 extern int sysctl_oom_kill_allocating_task;
  69 extern int sysctl_oom_dump_tasks;
  70 extern int max_threads;
  71 extern int core_uses_pid;
  72 extern int suid_dumpable;
  73 extern char core_pattern[];
  74 extern int pid_max;
  75 extern int min_free_kbytes;
  76 extern int pid_max_min, pid_max_max;
  77 extern int sysctl_drop_caches;
  78 extern int percpu_pagelist_fraction;
  79 extern int compat_log;
  80 extern int maps_protect;
  81 extern int sysctl_stat_interval;
  82 extern int latencytop_enabled;
  83
  84 /* Constants used for minimum and  maximum */
  85 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
  86 static int one = 1;
  87 #endif
  88
  89 #ifdef CONFIG_DETECT_SOFTLOCKUP
  90 static int sixty = 60;
  91 #endif
  92
  93 #ifdef CONFIG_MMU
  94 static int two = 2;
  95 #endif
  96
  97 static int zero;
  98 static int one_hundred = 100;
  99
 100 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 101 static int maxolduid = 65535;
 102 static int minolduid;
 103 static int min_percpu_pagelist_fract = 8;
 104
 105 static int ngroups_max = NGROUPS_MAX;
 106
 107 #ifdef CONFIG_KMOD
 108 extern char modprobe_path[];
 109 #endif
 110 #ifdef CONFIG_CHR_DEV_SG
 111 extern int sg_big_buff;
 112 #endif
 113
 114 #ifdef __sparc__
 115 extern char reboot_command [];
 116 extern int stop_a_enabled;
 117 extern int scons_pwroff;
 118 #endif
 119
 120 #ifdef __hppa__
 121 extern int pwrsw_enabled;
 122 extern int unaligned_enabled;
 123 #endif
 124
 125 #ifdef CONFIG_S390
 126 #ifdef CONFIG_MATHEMU
 127 extern int sysctl_ieee_emulation_warnings;
 128 #endif
 129 extern int sysctl_userprocess_debug;
 130 extern int spin_retry;
 131 #endif
 132
 133 extern int sysctl_hz_timer;
 134
 135 #ifdef CONFIG_BSD_PROCESS_ACCT
 136 extern int acct_parm[];
 137 #endif
 138
 139 #ifdef CONFIG_IA64
 140 extern int no_unaligned_warning;
 141 #endif
 142
 143 #ifdef CONFIG_RT_MUTEXES
 144 extern int max_lock_depth;
 145 #endif
 146
 147 #ifdef CONFIG_SYSCTL_SYSCALL
 148 static int parse_table(int __user *, int, void __user *, size_t __user *,
 149                 void __user *, size_t, struct ctl_table *);
 150 #endif
 151
 152
 153 #ifdef CONFIG_PROC_SYSCTL
 154 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 155                   void __user *buffer, size_t *lenp, loff_t *ppos);
 156 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 157                                void __user *buffer, size_t *lenp, loff_t *ppos);
 158 #endif
 159
 160 static struct ctl_table root_table[];
 161 static struct ctl_table_root sysctl_table_root;
 162 static struct ctl_table_header root_table_header = {
 163         .ctl_table = root_table,
 164         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 165         .root = &sysctl_table_root,
 166 };
 167 static struct ctl_table_root sysctl_table_root = {
 168         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 169         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 170 };
 171
 172 static struct ctl_table kern_table[];
 173 static struct ctl_table vm_table[];
 174 static struct ctl_table fs_table[];
 175 static struct ctl_table debug_table[];
 176 static struct ctl_table dev_table[];
 177 extern struct ctl_table random_table[];
 178 #ifdef CONFIG_INOTIFY_USER
 179 extern struct ctl_table inotify_table[];
 180 #endif
 181
 182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 183 int sysctl_legacy_va_layout;
 184 #endif
 185
 186 extern int prove_locking;
 187 extern int lock_stat;
 188
 189 /* The default sysctl tables: */
 190
 191 static struct ctl_table root_table[] = {
 192         {
 193                 .ctl_name       = CTL_KERN,
 194                 .procname       = "kernel",
 195                 .mode           = 0555,
 196                 .child          = kern_table,
 197         },
 198         {
 199                 .ctl_name       = CTL_VM,
 200                 .procname       = "vm",
 201                 .mode           = 0555,
 202                 .child          = vm_table,
 203         },
 204         {
 205                 .ctl_name       = CTL_FS,
 206                 .procname       = "fs",
 207                 .mode           = 0555,
 208                 .child          = fs_table,
 209         },
 210         {
 211                 .ctl_name       = CTL_DEBUG,
 212                 .procname       = "debug",
 213                 .mode           = 0555,
 214                 .child          = debug_table,
 215         },
 216         {
 217                 .ctl_name       = CTL_DEV,
 218                 .procname       = "dev",
 219                 .mode           = 0555,
 220                 .child          = dev_table,
 221         },
 222 /*
 223  * NOTE: do not add new entries to this table unless you have read
 224  * Documentation/sysctl/ctl_unnumbered.txt
 225  */
 226         { .ctl_name = 0 }
 227 };
 228
 229 #ifdef CONFIG_SCHED_DEBUG
 230 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 231 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 232 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 233 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 234 #endif
 235
 236 static struct ctl_table kern_table[] = {
 237 #ifdef CONFIG_SCHED_DEBUG
 238         {
 239                 .ctl_name       = CTL_UNNUMBERED,
 240                 .procname       = "sched_min_granularity_ns",
 241                 .data           = &sysctl_sched_min_granularity,
 242                 .maxlen         = sizeof(unsigned int),
 243                 .mode           = 0644,
 244                 .proc_handler   = &sched_nr_latency_handler,
 245                 .strategy       = &sysctl_intvec,
 246                 .extra1         = &min_sched_granularity_ns,
 247                 .extra2         = &max_sched_granularity_ns,
 248         },
 249         {
 250                 .ctl_name       = CTL_UNNUMBERED,
 251                 .procname       = "sched_latency_ns",
 252                 .data           = &sysctl_sched_latency,
 253                 .maxlen         = sizeof(unsigned int),
 254                 .mode           = 0644,
 255                 .proc_handler   = &sched_nr_latency_handler,
 256                 .strategy       = &sysctl_intvec,
 257                 .extra1         = &min_sched_granularity_ns,
 258                 .extra2         = &max_sched_granularity_ns,
 259         },
 260         {
 261                 .ctl_name       = CTL_UNNUMBERED,
 262                 .procname       = "sched_wakeup_granularity_ns",
 263                 .data           = &sysctl_sched_wakeup_granularity,
 264                 .maxlen         = sizeof(unsigned int),
 265                 .mode           = 0644,
 266                 .proc_handler   = &proc_dointvec_minmax,
 267                 .strategy       = &sysctl_intvec,
 268                 .extra1         = &min_wakeup_granularity_ns,
 269                 .extra2         = &max_wakeup_granularity_ns,
 270         },
 271         {
 272                 .ctl_name       = CTL_UNNUMBERED,
 273                 .procname       = "sched_child_runs_first",
 274                 .data           = &sysctl_sched_child_runs_first,
 275                 .maxlen         = sizeof(unsigned int),
 276                 .mode           = 0644,
 277                 .proc_handler   = &proc_dointvec,
 278         },
 279         {
 280                 .ctl_name       = CTL_UNNUMBERED,
 281                 .procname       = "sched_features",
 282                 .data           = &sysctl_sched_features,
 283                 .maxlen         = sizeof(unsigned int),
 284                 .mode           = 0644,
 285                 .proc_handler   = &proc_dointvec,
 286         },
 287         {
 288                 .ctl_name       = CTL_UNNUMBERED,
 289                 .procname       = "sched_migration_cost",
 290                 .data           = &sysctl_sched_migration_cost,
 291                 .maxlen         = sizeof(unsigned int),
 292                 .mode           = 0644,
 293                 .proc_handler   = &proc_dointvec,
 294         },
 295         {
 296                 .ctl_name       = CTL_UNNUMBERED,
 297                 .procname       = "sched_nr_migrate",
 298                 .data           = &sysctl_sched_nr_migrate,
 299                 .maxlen         = sizeof(unsigned int),
 300                 .mode           = 0644,
 301                 .proc_handler   = &proc_dointvec,
 302         },
 303 #endif
 304         {
 305                 .ctl_name       = CTL_UNNUMBERED,
 306                 .procname       = "sched_rt_period_us",
 307                 .data           = &sysctl_sched_rt_period,
 308                 .maxlen         = sizeof(unsigned int),
 309                 .mode           = 0644,
 310                 .proc_handler   = &sched_rt_handler,
 311         },
 312         {
 313                 .ctl_name       = CTL_UNNUMBERED,
 314                 .procname       = "sched_rt_runtime_us",
 315                 .data           = &sysctl_sched_rt_runtime,
 316                 .maxlen         = sizeof(int),
 317                 .mode           = 0644,
 318                 .proc_handler   = &sched_rt_handler,
 319         },
 320         {
 321                 .ctl_name       = CTL_UNNUMBERED,
 322                 .procname       = "sched_compat_yield",
 323                 .data           = &sysctl_sched_compat_yield,
 324                 .maxlen         = sizeof(unsigned int),
 325                 .mode           = 0644,
 326                 .proc_handler   = &proc_dointvec,
 327         },
 328 #ifdef CONFIG_PROVE_LOCKING
 329         {
 330                 .ctl_name       = CTL_UNNUMBERED,
 331                 .procname       = "prove_locking",
 332                 .data           = &prove_locking,
 333                 .maxlen         = sizeof(int),
 334                 .mode           = 0644,
 335                 .proc_handler   = &proc_dointvec,
 336         },
 337 #endif
 338 #ifdef CONFIG_LOCK_STAT
 339         {
 340                 .ctl_name       = CTL_UNNUMBERED,
 341                 .procname       = "lock_stat",
 342                 .data           = &lock_stat,
 343                 .maxlen         = sizeof(int),
 344                 .mode           = 0644,
 345                 .proc_handler   = &proc_dointvec,
 346         },
 347 #endif
 348         {
 349                 .ctl_name       = KERN_PANIC,
 350                 .procname       = "panic",
 351                 .data           = &panic_timeout,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = &proc_dointvec,
 355         },
 356         {
 357                 .ctl_name       = KERN_CORE_USES_PID,
 358                 .procname       = "core_uses_pid",
 359                 .data           = &core_uses_pid,
 360                 .maxlen         = sizeof(int),
 361                 .mode           = 0644,
 362                 .proc_handler   = &proc_dointvec,
 363         },
 364         {
 365                 .ctl_name       = KERN_CORE_PATTERN,
 366                 .procname       = "core_pattern",
 367                 .data           = core_pattern,
 368                 .maxlen         = CORENAME_MAX_SIZE,
 369                 .mode           = 0644,
 370                 .proc_handler   = &proc_dostring,
 371                 .strategy       = &sysctl_string,
 372         },
 373 #ifdef CONFIG_PROC_SYSCTL
 374         {
 375                 .procname       = "tainted",
 376                 .data           = &tainted,
 377                 .maxlen         = sizeof(int),
 378                 .mode           = 0644,
 379                 .proc_handler   = &proc_dointvec_taint,
 380         },
 381 #endif
 382 #ifdef CONFIG_LATENCYTOP
 383         {
 384                 .procname       = "latencytop",
 385                 .data           = &latencytop_enabled,
 386                 .maxlen         = sizeof(int),
 387                 .mode           = 0644,
 388                 .proc_handler   = &proc_dointvec,
 389         },
 390 #endif
 391 #ifdef CONFIG_BLK_DEV_INITRD
 392         {
 393                 .ctl_name       = KERN_REALROOTDEV,
 394                 .procname       = "real-root-dev",
 395                 .data           = &real_root_dev,
 396                 .maxlen         = sizeof(int),
 397                 .mode           = 0644,
 398                 .proc_handler   = &proc_dointvec,
 399         },
 400 #endif
 401         {
 402                 .ctl_name       = CTL_UNNUMBERED,
 403                 .procname       = "print-fatal-signals",
 404                 .data           = &print_fatal_signals,
 405                 .maxlen         = sizeof(int),
 406                 .mode           = 0644,
 407                 .proc_handler   = &proc_dointvec,
 408         },
 409 #ifdef __sparc__
 410         {
 411                 .ctl_name       = KERN_SPARC_REBOOT,
 412                 .procname       = "reboot-cmd",
 413                 .data           = reboot_command,
 414                 .maxlen         = 256,
 415                 .mode           = 0644,
 416                 .proc_handler   = &proc_dostring,
 417                 .strategy       = &sysctl_string,
 418         },
 419         {
 420                 .ctl_name       = KERN_SPARC_STOP_A,
 421                 .procname       = "stop-a",
 422                 .data           = &stop_a_enabled,
 423                 .maxlen         = sizeof (int),
 424                 .mode           = 0644,
 425                 .proc_handler   = &proc_dointvec,
 426         },
 427         {
 428                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 429                 .procname       = "scons-poweroff",
 430                 .data           = &scons_pwroff,
 431                 .maxlen         = sizeof (int),
 432                 .mode           = 0644,
 433                 .proc_handler   = &proc_dointvec,
 434         },
 435 #endif
 436 #ifdef __hppa__
 437         {
 438                 .ctl_name       = KERN_HPPA_PWRSW,
 439                 .procname       = "soft-power",
 440                 .data           = &pwrsw_enabled,
 441                 .maxlen         = sizeof (int),
 442                 .mode           = 0644,
 443                 .proc_handler   = &proc_dointvec,
 444         },
 445         {
 446                 .ctl_name       = KERN_HPPA_UNALIGNED,
 447                 .procname       = "unaligned-trap",
 448                 .data           = &unaligned_enabled,
 449                 .maxlen         = sizeof (int),
 450                 .mode           = 0644,
 451                 .proc_handler   = &proc_dointvec,
 452         },
 453 #endif
 454         {
 455                 .ctl_name       = KERN_CTLALTDEL,
 456                 .procname       = "ctrl-alt-del",
 457                 .data           = &C_A_D,
 458                 .maxlen         = sizeof(int),
 459                 .mode           = 0644,
 460                 .proc_handler   = &proc_dointvec,
 461         },
 462 #ifdef CONFIG_KMOD
 463         {
 464                 .ctl_name       = KERN_MODPROBE,
 465                 .procname       = "modprobe",
 466                 .data           = &modprobe_path,
 467                 .maxlen         = KMOD_PATH_LEN,
 468                 .mode           = 0644,
 469                 .proc_handler   = &proc_dostring,
 470                 .strategy       = &sysctl_string,
 471         },
 472 #endif
 473 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 474         {
 475                 .ctl_name       = KERN_HOTPLUG,
 476                 .procname       = "hotplug",
 477                 .data           = &uevent_helper,
 478                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 479                 .mode           = 0644,
 480                 .proc_handler   = &proc_dostring,
 481                 .strategy       = &sysctl_string,
 482         },
 483 #endif
 484 #ifdef CONFIG_CHR_DEV_SG
 485         {
 486                 .ctl_name       = KERN_SG_BIG_BUFF,
 487                 .procname       = "sg-big-buff",
 488                 .data           = &sg_big_buff,
 489                 .maxlen         = sizeof (int),
 490                 .mode           = 0444,
 491                 .proc_handler   = &proc_dointvec,
 492         },
 493 #endif
 494 #ifdef CONFIG_BSD_PROCESS_ACCT
 495         {
 496                 .ctl_name       = KERN_ACCT,
 497                 .procname       = "acct",
 498                 .data           = &acct_parm,
 499                 .maxlen         = 3*sizeof(int),
 500                 .mode           = 0644,
 501                 .proc_handler   = &proc_dointvec,
 502         },
 503 #endif
 504 #ifdef CONFIG_MAGIC_SYSRQ
 505         {
 506                 .ctl_name       = KERN_SYSRQ,
 507                 .procname       = "sysrq",
 508                 .data           = &__sysrq_enabled,
 509                 .maxlen         = sizeof (int),
 510                 .mode           = 0644,
 511                 .proc_handler   = &proc_dointvec,
 512         },
 513 #endif
 514 #ifdef CONFIG_PROC_SYSCTL
 515         {
 516                 .procname       = "cad_pid",
 517                 .data           = NULL,
 518                 .maxlen         = sizeof (int),
 519                 .mode           = 0600,
 520                 .proc_handler   = &proc_do_cad_pid,
 521         },
 522 #endif
 523         {
 524                 .ctl_name       = KERN_MAX_THREADS,
 525                 .procname       = "threads-max",
 526                 .data           = &max_threads,
 527                 .maxlen         = sizeof(int),
 528                 .mode           = 0644,
 529                 .proc_handler   = &proc_dointvec,
 530         },
 531         {
 532                 .ctl_name       = KERN_RANDOM,
 533                 .procname       = "random",
 534                 .mode           = 0555,
 535                 .child          = random_table,
 536         },
 537         {
 538                 .ctl_name       = KERN_OVERFLOWUID,
 539                 .procname       = "overflowuid",
 540                 .data           = &overflowuid,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = &proc_dointvec_minmax,
 544                 .strategy       = &sysctl_intvec,
 545                 .extra1         = &minolduid,
 546                 .extra2         = &maxolduid,
 547         },
 548         {
 549                 .ctl_name       = KERN_OVERFLOWGID,
 550                 .procname       = "overflowgid",
 551                 .data           = &overflowgid,
 552                 .maxlen         = sizeof(int),
 553                 .mode           = 0644,
 554                 .proc_handler   = &proc_dointvec_minmax,
 555                 .strategy       = &sysctl_intvec,
 556                 .extra1         = &minolduid,
 557                 .extra2         = &maxolduid,
 558         },
 559 #ifdef CONFIG_S390
 560 #ifdef CONFIG_MATHEMU
 561         {
 562                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 563                 .procname       = "ieee_emulation_warnings",
 564                 .data           = &sysctl_ieee_emulation_warnings,
 565                 .maxlen         = sizeof(int),
 566                 .mode           = 0644,
 567                 .proc_handler   = &proc_dointvec,
 568         },
 569 #endif
 570 #ifdef CONFIG_NO_IDLE_HZ
 571         {
 572                 .ctl_name       = KERN_HZ_TIMER,
 573                 .procname       = "hz_timer",
 574                 .data           = &sysctl_hz_timer,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec,
 578         },
 579 #endif
 580         {
 581                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 582                 .procname       = "userprocess_debug",
 583                 .data           = &sysctl_userprocess_debug,
 584                 .maxlen         = sizeof(int),
 585                 .mode           = 0644,
 586                 .proc_handler   = &proc_dointvec,
 587         },
 588 #endif
 589         {
 590                 .ctl_name       = KERN_PIDMAX,
 591                 .procname       = "pid_max",
 592                 .data           = &pid_max,
 593                 .maxlen         = sizeof (int),
 594                 .mode           = 0644,
 595                 .proc_handler   = &proc_dointvec_minmax,
 596                 .strategy       = sysctl_intvec,
 597                 .extra1         = &pid_max_min,
 598                 .extra2         = &pid_max_max,
 599         },
 600         {
 601                 .ctl_name       = KERN_PANIC_ON_OOPS,
 602                 .procname       = "panic_on_oops",
 603                 .data           = &panic_on_oops,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec,
 607         },
 608 #if defined CONFIG_PRINTK
 609         {
 610                 .ctl_name       = KERN_PRINTK,
 611                 .procname       = "printk",
 612                 .data           = &console_loglevel,
 613                 .maxlen         = 4*sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec,
 616         },
 617         {
 618                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 619                 .procname       = "printk_ratelimit",
 620                 .data           = &printk_ratelimit_jiffies,
 621                 .maxlen         = sizeof(int),
 622                 .mode           = 0644,
 623                 .proc_handler   = &proc_dointvec_jiffies,
 624                 .strategy       = &sysctl_jiffies,
 625         },
 626         {
 627                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 628                 .procname       = "printk_ratelimit_burst",
 629                 .data           = &printk_ratelimit_burst,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 .proc_handler   = &proc_dointvec,
 633         },
 634 #endif
 635         {
 636                 .ctl_name       = KERN_NGROUPS_MAX,
 637                 .procname       = "ngroups_max",
 638                 .data           = &ngroups_max,
 639                 .maxlen         = sizeof (int),
 640                 .mode           = 0444,
 641                 .proc_handler   = &proc_dointvec,
 642         },
 643 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 644         {
 645                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 646                 .procname       = "unknown_nmi_panic",
 647                 .data           = &unknown_nmi_panic,
 648                 .maxlen         = sizeof (int),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec,
 651         },
 652         {
 653                 .procname       = "nmi_watchdog",
 654                 .data           = &nmi_watchdog_enabled,
 655                 .maxlen         = sizeof (int),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_nmi_enabled,
 658         },
 659 #endif
 660 #if defined(CONFIG_X86)
 661         {
 662                 .ctl_name       = KERN_PANIC_ON_NMI,
 663                 .procname       = "panic_on_unrecovered_nmi",
 664                 .data           = &panic_on_unrecovered_nmi,
 665                 .maxlen         = sizeof(int),
 666                 .mode           = 0644,
 667                 .proc_handler   = &proc_dointvec,
 668         },
 669         {
 670                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 671                 .procname       = "bootloader_type",
 672                 .data           = &bootloader_type,
 673                 .maxlen         = sizeof (int),
 674                 .mode           = 0444,
 675                 .proc_handler   = &proc_dointvec,
 676         },
 677         {
 678                 .ctl_name       = CTL_UNNUMBERED,
 679                 .procname       = "kstack_depth_to_print",
 680                 .data           = &kstack_depth_to_print,
 681                 .maxlen         = sizeof(int),
 682                 .mode           = 0644,
 683                 .proc_handler   = &proc_dointvec,
 684         },
 685         {
 686                 .ctl_name       = CTL_UNNUMBERED,
 687                 .procname       = "io_delay_type",
 688                 .data           = &io_delay_type,
 689                 .maxlen         = sizeof(int),
 690                 .mode           = 0644,
 691                 .proc_handler   = &proc_dointvec,
 692         },
 693 #endif
 694 #if defined(CONFIG_MMU)
 695         {
 696                 .ctl_name       = KERN_RANDOMIZE,
 697                 .procname       = "randomize_va_space",
 698                 .data           = &randomize_va_space,
 699                 .maxlen         = sizeof(int),
 700                 .mode           = 0644,
 701                 .proc_handler   = &proc_dointvec,
 702         },
 703 #endif
 704 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 705         {
 706                 .ctl_name       = KERN_SPIN_RETRY,
 707                 .procname       = "spin_retry",
 708                 .data           = &spin_retry,
 709                 .maxlen         = sizeof (int),
 710                 .mode           = 0644,
 711                 .proc_handler   = &proc_dointvec,
 712         },
 713 #endif
 714 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 715         {
 716                 .procname       = "acpi_video_flags",
 717                 .data           = &acpi_realmode_flags,
 718                 .maxlen         = sizeof (unsigned long),
 719                 .mode           = 0644,
 720                 .proc_handler   = &proc_doulongvec_minmax,
 721         },
 722 #endif
 723 #ifdef CONFIG_IA64
 724         {
 725                 .ctl_name       = KERN_IA64_UNALIGNED,
 726                 .procname       = "ignore-unaligned-usertrap",
 727                 .data           = &no_unaligned_warning,
 728                 .maxlen         = sizeof (int),
 729                 .mode           = 0644,
 730                 .proc_handler   = &proc_dointvec,
 731         },
 732 #endif
 733 #ifdef CONFIG_DETECT_SOFTLOCKUP
 734         {
 735                 .ctl_name       = CTL_UNNUMBERED,
 736                 .procname       = "softlockup_thresh",
 737                 .data           = &softlockup_thresh,
 738                 .maxlen         = sizeof(unsigned long),
 739                 .mode           = 0644,
 740                 .proc_handler   = &proc_doulongvec_minmax,
 741                 .strategy       = &sysctl_intvec,
 742                 .extra1         = &one,
 743                 .extra2         = &sixty,
 744         },
 745         {
 746                 .ctl_name       = CTL_UNNUMBERED,
 747                 .procname       = "hung_task_check_count",
 748                 .data           = &sysctl_hung_task_check_count,
 749                 .maxlen         = sizeof(unsigned long),
 750                 .mode           = 0644,
 751                 .proc_handler   = &proc_doulongvec_minmax,
 752                 .strategy       = &sysctl_intvec,
 753         },
 754         {
 755                 .ctl_name       = CTL_UNNUMBERED,
 756                 .procname       = "hung_task_timeout_secs",
 757                 .data           = &sysctl_hung_task_timeout_secs,
 758                 .maxlen         = sizeof(unsigned long),
 759                 .mode           = 0644,
 760                 .proc_handler   = &proc_doulongvec_minmax,
 761                 .strategy       = &sysctl_intvec,
 762         },
 763         {
 764                 .ctl_name       = CTL_UNNUMBERED,
 765                 .procname       = "hung_task_warnings",
 766                 .data           = &sysctl_hung_task_warnings,
 767                 .maxlen         = sizeof(unsigned long),
 768                 .mode           = 0644,
 769                 .proc_handler   = &proc_doulongvec_minmax,
 770                 .strategy       = &sysctl_intvec,
 771         },
 772 #endif
 773 #ifdef CONFIG_COMPAT
 774         {
 775                 .ctl_name       = KERN_COMPAT_LOG,
 776                 .procname       = "compat-log",
 777                 .data           = &compat_log,
 778                 .maxlen         = sizeof (int),
 779                 .mode           = 0644,
 780                 .proc_handler   = &proc_dointvec,
 781         },
 782 #endif
 783 #ifdef CONFIG_RT_MUTEXES
 784         {
 785                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 786                 .procname       = "max_lock_depth",
 787                 .data           = &max_lock_depth,
 788                 .maxlen         = sizeof(int),
 789                 .mode           = 0644,
 790                 .proc_handler   = &proc_dointvec,
 791         },
 792 #endif
 793 #ifdef CONFIG_PROC_FS
 794         {
 795                 .ctl_name       = CTL_UNNUMBERED,
 796                 .procname       = "maps_protect",
 797                 .data           = &maps_protect,
 798                 .maxlen         = sizeof(int),
 799                 .mode           = 0644,
 800                 .proc_handler   = &proc_dointvec,
 801         },
 802 #endif
 803         {
 804                 .ctl_name       = CTL_UNNUMBERED,
 805                 .procname       = "poweroff_cmd",
 806                 .data           = &poweroff_cmd,
 807                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 808                 .mode           = 0644,
 809                 .proc_handler   = &proc_dostring,
 810                 .strategy       = &sysctl_string,
 811         },
 812 /*
 813  * NOTE: do not add new entries to this table unless you have read
 814  * Documentation/sysctl/ctl_unnumbered.txt
 815  */
 816         { .ctl_name = 0 }
 817 };
 818
 819 static struct ctl_table vm_table[] = {
 820         {
 821                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 822                 .procname       = "overcommit_memory",
 823                 .data           = &sysctl_overcommit_memory,
 824                 .maxlen         = sizeof(sysctl_overcommit_memory),
 825                 .mode           = 0644,
 826                 .proc_handler   = &proc_dointvec,
 827         },
 828         {
 829                 .ctl_name       = VM_PANIC_ON_OOM,
 830                 .procname       = "panic_on_oom",
 831                 .data           = &sysctl_panic_on_oom,
 832                 .maxlen         = sizeof(sysctl_panic_on_oom),
 833                 .mode           = 0644,
 834                 .proc_handler   = &proc_dointvec,
 835         },
 836         {
 837                 .ctl_name       = CTL_UNNUMBERED,
 838                 .procname       = "oom_kill_allocating_task",
 839                 .data           = &sysctl_oom_kill_allocating_task,
 840                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 841                 .mode           = 0644,
 842                 .proc_handler   = &proc_dointvec,
 843         },
 844         {
 845                 .ctl_name       = CTL_UNNUMBERED,
 846                 .procname       = "oom_dump_tasks",
 847                 .data           = &sysctl_oom_dump_tasks,
 848                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 849                 .mode           = 0644,
 850                 .proc_handler   = &proc_dointvec,
 851         },
 852         {
 853                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 854                 .procname       = "overcommit_ratio",
 855                 .data           = &sysctl_overcommit_ratio,
 856                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 857                 .mode           = 0644,
 858                 .proc_handler   = &proc_dointvec,
 859         },
 860         {
 861                 .ctl_name       = VM_PAGE_CLUSTER,
 862                 .procname       = "page-cluster",
 863                 .data           = &page_cluster,
 864                 .maxlen         = sizeof(int),
 865                 .mode           = 0644,
 866                 .proc_handler   = &proc_dointvec,
 867         },
 868         {
 869                 .ctl_name       = VM_DIRTY_BACKGROUND,
 870                 .procname       = "dirty_background_ratio",
 871                 .data           = &dirty_background_ratio,
 872                 .maxlen         = sizeof(dirty_background_ratio),
 873                 .mode           = 0644,
 874                 .proc_handler   = &proc_dointvec_minmax,
 875                 .strategy       = &sysctl_intvec,
 876                 .extra1         = &zero,
 877                 .extra2         = &one_hundred,
 878         },
 879         {
 880                 .ctl_name       = VM_DIRTY_RATIO,
 881                 .procname       = "dirty_ratio",
 882                 .data           = &vm_dirty_ratio,
 883                 .maxlen         = sizeof(vm_dirty_ratio),
 884                 .mode           = 0644,
 885                 .proc_handler   = &dirty_ratio_handler,
 886                 .strategy       = &sysctl_intvec,
 887                 .extra1         = &zero,
 888                 .extra2         = &one_hundred,
 889         },
 890         {
 891                 .procname       = "dirty_writeback_centisecs",
 892                 .data           = &dirty_writeback_interval,
 893                 .maxlen         = sizeof(dirty_writeback_interval),
 894                 .mode           = 0644,
 895                 .proc_handler   = &dirty_writeback_centisecs_handler,
 896         },
 897         {
 898                 .procname       = "dirty_expire_centisecs",
 899                 .data           = &dirty_expire_interval,
 900                 .maxlen         = sizeof(dirty_expire_interval),
 901                 .mode           = 0644,
 902                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 903         },
 904         {
 905                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 906                 .procname       = "nr_pdflush_threads",
 907                 .data           = &nr_pdflush_threads,
 908                 .maxlen         = sizeof nr_pdflush_threads,
 909                 .mode           = 0444 /* read-only*/,
 910                 .proc_handler   = &proc_dointvec,
 911         },
 912         {
 913                 .ctl_name       = VM_SWAPPINESS,
 914                 .procname       = "swappiness",
 915                 .data           = &vm_swappiness,
 916                 .maxlen         = sizeof(vm_swappiness),
 917                 .mode           = 0644,
 918                 .proc_handler   = &proc_dointvec_minmax,
 919                 .strategy       = &sysctl_intvec,
 920                 .extra1         = &zero,
 921                 .extra2         = &one_hundred,
 922         },
 923 #ifdef CONFIG_HUGETLB_PAGE
 924          {
 925                 .procname       = "nr_hugepages",
 926                 .data           = &max_huge_pages,
 927                 .maxlen         = sizeof(unsigned long),
 928                 .mode           = 0644,
 929                 .proc_handler   = &hugetlb_sysctl_handler,
 930                 .extra1         = (void *)&hugetlb_zero,
 931                 .extra2         = (void *)&hugetlb_infinity,
 932          },
 933          {
 934                 .ctl_name       = VM_HUGETLB_GROUP,
 935                 .procname       = "hugetlb_shm_group",
 936                 .data           = &sysctl_hugetlb_shm_group,
 937                 .maxlen         = sizeof(gid_t),
 938                 .mode           = 0644,
 939                 .proc_handler   = &proc_dointvec,
 940          },
 941          {
 942                 .ctl_name       = CTL_UNNUMBERED,
 943                 .procname       = "hugepages_treat_as_movable",
 944                 .data           = &hugepages_treat_as_movable,
 945                 .maxlen         = sizeof(int),
 946                 .mode           = 0644,
 947                 .proc_handler   = &hugetlb_treat_movable_handler,
 948         },
 949         {
 950                 .ctl_name       = CTL_UNNUMBERED,
 951                 .procname       = "nr_overcommit_hugepages",
 952                 .data           = &sysctl_overcommit_huge_pages,
 953                 .maxlen         = sizeof(sysctl_overcommit_huge_pages),
 954                 .mode           = 0644,
 955                 .proc_handler   = &hugetlb_overcommit_handler,
 956         },
 957 #endif
 958         {
 959                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 960                 .procname       = "lowmem_reserve_ratio",
 961                 .data           = &sysctl_lowmem_reserve_ratio,
 962                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 963                 .mode           = 0644,
 964                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 965                 .strategy       = &sysctl_intvec,
 966         },
 967         {
 968                 .ctl_name       = VM_DROP_PAGECACHE,
 969                 .procname       = "drop_caches",
 970                 .data           = &sysctl_drop_caches,
 971                 .maxlen         = sizeof(int),
 972                 .mode           = 0644,
 973                 .proc_handler   = drop_caches_sysctl_handler,
 974                 .strategy       = &sysctl_intvec,
 975         },
 976         {
 977                 .ctl_name       = VM_MIN_FREE_KBYTES,
 978                 .procname       = "min_free_kbytes",
 979                 .data           = &min_free_kbytes,
 980                 .maxlen         = sizeof(min_free_kbytes),
 981                 .mode           = 0644,
 982                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 983                 .strategy       = &sysctl_intvec,
 984                 .extra1         = &zero,
 985         },
 986         {
 987                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 988                 .procname       = "percpu_pagelist_fraction",
 989                 .data           = &percpu_pagelist_fraction,
 990                 .maxlen         = sizeof(percpu_pagelist_fraction),
 991                 .mode           = 0644,
 992                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 993                 .strategy       = &sysctl_intvec,
 994                 .extra1         = &min_percpu_pagelist_fract,
 995         },
 996 #ifdef CONFIG_MMU
 997         {
 998                 .ctl_name       = VM_MAX_MAP_COUNT,
 999                 .procname       = "max_map_count",
1000                 .data           = &sysctl_max_map_count,
1001                 .maxlen         = sizeof(sysctl_max_map_count),
1002                 .mode           = 0644,
1003                 .proc_handler   = &proc_dointvec
1004         },
1005 #endif
1006         {
1007                 .ctl_name       = VM_LAPTOP_MODE,
1008                 .procname       = "laptop_mode",
1009                 .data           = &laptop_mode,
1010                 .maxlen         = sizeof(laptop_mode),
1011                 .mode           = 0644,
1012                 .proc_handler   = &proc_dointvec_jiffies,
1013                 .strategy       = &sysctl_jiffies,
1014         },
1015         {
1016                 .ctl_name       = VM_BLOCK_DUMP,
1017                 .procname       = "block_dump",
1018                 .data           = &block_dump,
1019                 .maxlen         = sizeof(block_dump),
1020                 .mode           = 0644,
1021                 .proc_handler   = &proc_dointvec,
1022                 .strategy       = &sysctl_intvec,
1023                 .extra1         = &zero,
1024         },
1025         {
1026                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1027                 .procname       = "vfs_cache_pressure",
1028                 .data           = &sysctl_vfs_cache_pressure,
1029                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1030                 .mode           = 0644,
1031                 .proc_handler   = &proc_dointvec,
1032                 .strategy       = &sysctl_intvec,
1033                 .extra1         = &zero,
1034         },
1035 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1036         {
1037                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1038                 .procname       = "legacy_va_layout",
1039                 .data           = &sysctl_legacy_va_layout,
1040                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1041                 .mode           = 0644,
1042                 .proc_handler   = &proc_dointvec,
1043                 .strategy       = &sysctl_intvec,
1044                 .extra1         = &zero,
1045         },
1046 #endif
1047 #ifdef CONFIG_NUMA
1048         {
1049                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1050                 .procname       = "zone_reclaim_mode",
1051                 .data           = &zone_reclaim_mode,
1052                 .maxlen         = sizeof(zone_reclaim_mode),
1053                 .mode           = 0644,
1054                 .proc_handler   = &proc_dointvec,
1055                 .strategy       = &sysctl_intvec,
1056                 .extra1         = &zero,
1057         },
1058         {
1059                 .ctl_name       = VM_MIN_UNMAPPED,
1060                 .procname       = "min_unmapped_ratio",
1061                 .data           = &sysctl_min_unmapped_ratio,
1062                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1063                 .mode           = 0644,
1064                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1065                 .strategy       = &sysctl_intvec,
1066                 .extra1         = &zero,
1067                 .extra2         = &one_hundred,
1068         },
1069         {
1070                 .ctl_name       = VM_MIN_SLAB,
1071                 .procname       = "min_slab_ratio",
1072                 .data           = &sysctl_min_slab_ratio,
1073                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1074                 .mode           = 0644,
1075                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1076                 .strategy       = &sysctl_intvec,
1077                 .extra1         = &zero,
1078                 .extra2         = &one_hundred,
1079         },
1080 #endif
1081 #ifdef CONFIG_SMP
1082         {
1083                 .ctl_name       = CTL_UNNUMBERED,
1084                 .procname       = "stat_interval",
1085                 .data           = &sysctl_stat_interval,
1086                 .maxlen         = sizeof(sysctl_stat_interval),
1087                 .mode           = 0644,
1088                 .proc_handler   = &proc_dointvec_jiffies,
1089                 .strategy       = &sysctl_jiffies,
1090         },
1091 #endif
1092 #ifdef CONFIG_SECURITY
1093         {
1094                 .ctl_name       = CTL_UNNUMBERED,
1095                 .procname       = "mmap_min_addr",
1096                 .data           = &mmap_min_addr,
1097                 .maxlen         = sizeof(unsigned long),
1098                 .mode           = 0644,
1099                 .proc_handler   = &proc_doulongvec_minmax,
1100         },
1101 #endif
1102 #ifdef CONFIG_NUMA
1103         {
1104                 .ctl_name       = CTL_UNNUMBERED,
1105                 .procname       = "numa_zonelist_order",
1106                 .data           = &numa_zonelist_order,
1107                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1108                 .mode           = 0644,
1109                 .proc_handler   = &numa_zonelist_order_handler,
1110                 .strategy       = &sysctl_string,
1111         },
1112 #endif
1113 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1114    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1115         {
1116                 .ctl_name       = VM_VDSO_ENABLED,
1117                 .procname       = "vdso_enabled",
1118                 .data           = &vdso_enabled,
1119                 .maxlen         = sizeof(vdso_enabled),
1120                 .mode           = 0644,
1121                 .proc_handler   = &proc_dointvec,
1122                 .strategy       = &sysctl_intvec,
1123                 .extra1         = &zero,
1124         },
1125 #endif
1126 #ifdef CONFIG_HIGHMEM
1127         {
1128                 .ctl_name       = CTL_UNNUMBERED,
1129                 .procname       = "highmem_is_dirtyable",
1130                 .data           = &vm_highmem_is_dirtyable,
1131                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1132                 .mode           = 0644,
1133                 .proc_handler   = &proc_dointvec_minmax,
1134                 .strategy       = &sysctl_intvec,
1135                 .extra1         = &zero,
1136                 .extra2         = &one,
1137         },
1138 #endif
1139 /*
1140  * NOTE: do not add new entries to this table unless you have read
1141  * Documentation/sysctl/ctl_unnumbered.txt
1142  */
1143         { .ctl_name = 0 }
1144 };
1145
1146 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1147 static struct ctl_table binfmt_misc_table[] = {
1148         { .ctl_name = 0 }
1149 };
1150 #endif
1151
1152 static struct ctl_table fs_table[] = {
1153         {
1154                 .ctl_name       = FS_NRINODE,
1155                 .procname       = "inode-nr",
1156                 .data           = &inodes_stat,
1157                 .maxlen         = 2*sizeof(int),
1158                 .mode           = 0444,
1159                 .proc_handler   = &proc_dointvec,
1160         },
1161         {
1162                 .ctl_name       = FS_STATINODE,
1163                 .procname       = "inode-state",
1164                 .data           = &inodes_stat,
1165                 .maxlen         = 7*sizeof(int),
1166                 .mode           = 0444,
1167                 .proc_handler   = &proc_dointvec,
1168         },
1169         {
1170                 .procname       = "file-nr",
1171                 .data           = &files_stat,
1172                 .maxlen         = 3*sizeof(int),
1173                 .mode           = 0444,
1174                 .proc_handler   = &proc_nr_files,
1175         },
1176         {
1177                 .ctl_name       = FS_MAXFILE,
1178                 .procname       = "file-max",
1179                 .data           = &files_stat.max_files,
1180                 .maxlen         = sizeof(int),
1181                 .mode           = 0644,
1182                 .proc_handler   = &proc_dointvec,
1183         },
1184         {
1185                 .ctl_name       = CTL_UNNUMBERED,
1186                 .procname       = "nr_open",
1187                 .data           = &sysctl_nr_open,
1188                 .maxlen         = sizeof(int),
1189                 .mode           = 0644,
1190                 .proc_handler   = &proc_dointvec,
1191         },
1192         {
1193                 .ctl_name       = FS_DENTRY,
1194                 .procname       = "dentry-state",
1195                 .data           = &dentry_stat,
1196                 .maxlen         = 6*sizeof(int),
1197                 .mode           = 0444,
1198                 .proc_handler   = &proc_dointvec,
1199         },
1200         {
1201                 .ctl_name       = FS_OVERFLOWUID,
1202                 .procname       = "overflowuid",
1203                 .data           = &fs_overflowuid,
1204                 .maxlen         = sizeof(int),
1205                 .mode           = 0644,
1206                 .proc_handler   = &proc_dointvec_minmax,
1207                 .strategy       = &sysctl_intvec,
1208                 .extra1         = &minolduid,
1209                 .extra2         = &maxolduid,
1210         },
1211         {
1212                 .ctl_name       = FS_OVERFLOWGID,
1213                 .procname       = "overflowgid",
1214                 .data           = &fs_overflowgid,
1215                 .maxlen         = sizeof(int),
1216                 .mode           = 0644,
1217                 .proc_handler   = &proc_dointvec_minmax,
1218                 .strategy       = &sysctl_intvec,
1219                 .extra1         = &minolduid,
1220                 .extra2         = &maxolduid,
1221         },
1222         {
1223                 .ctl_name       = FS_LEASES,
1224                 .procname       = "leases-enable",
1225                 .data           = &leases_enable,
1226                 .maxlen         = sizeof(int),
1227                 .mode           = 0644,
1228                 .proc_handler   = &proc_dointvec,
1229         },
1230 #ifdef CONFIG_DNOTIFY
1231         {
1232                 .ctl_name       = FS_DIR_NOTIFY,
1233                 .procname       = "dir-notify-enable",
1234                 .data           = &dir_notify_enable,
1235                 .maxlen         = sizeof(int),
1236                 .mode           = 0644,
1237                 .proc_handler   = &proc_dointvec,
1238         },
1239 #endif
1240 #ifdef CONFIG_MMU
1241         {
1242                 .ctl_name       = FS_LEASE_TIME,
1243                 .procname       = "lease-break-time",
1244                 .data           = &lease_break_time,
1245                 .maxlen         = sizeof(int),
1246                 .mode           = 0644,
1247                 .proc_handler   = &proc_dointvec_minmax,
1248                 .strategy       = &sysctl_intvec,
1249                 .extra1         = &zero,
1250                 .extra2         = &two,
1251         },
1252         {
1253                 .procname       = "aio-nr",
1254                 .data           = &aio_nr,
1255                 .maxlen         = sizeof(aio_nr),
1256                 .mode           = 0444,
1257                 .proc_handler   = &proc_doulongvec_minmax,
1258         },
1259         {
1260                 .procname       = "aio-max-nr",
1261                 .data           = &aio_max_nr,
1262                 .maxlen         = sizeof(aio_max_nr),
1263                 .mode           = 0644,
1264                 .proc_handler   = &proc_doulongvec_minmax,
1265         },
1266 #ifdef CONFIG_INOTIFY_USER
1267         {
1268                 .ctl_name       = FS_INOTIFY,
1269                 .procname       = "inotify",
1270                 .mode           = 0555,
1271                 .child          = inotify_table,
1272         },
1273 #endif
1274 #endif
1275         {
1276                 .ctl_name       = KERN_SETUID_DUMPABLE,
1277                 .procname       = "suid_dumpable",
1278                 .data           = &suid_dumpable,
1279                 .maxlen         = sizeof(int),
1280                 .mode           = 0644,
1281                 .proc_handler   = &proc_dointvec,
1282         },
1283 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1284         {
1285                 .ctl_name       = CTL_UNNUMBERED,
1286                 .procname       = "binfmt_misc",
1287                 .mode           = 0555,
1288                 .child          = binfmt_misc_table,
1289         },
1290 #endif
1291 /*
1292  * NOTE: do not add new entries to this table unless you have read
1293  * Documentation/sysctl/ctl_unnumbered.txt
1294  */
1295         { .ctl_name = 0 }
1296 };
1297
1298 static struct ctl_table debug_table[] = {
1299 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1300         {
1301                 .ctl_name       = CTL_UNNUMBERED,
1302                 .procname       = "exception-trace",
1303                 .data           = &show_unhandled_signals,
1304                 .maxlen         = sizeof(int),
1305                 .mode           = 0644,
1306                 .proc_handler   = proc_dointvec
1307         },
1308 #endif
1309         { .ctl_name = 0 }
1310 };
1311
1312 static struct ctl_table dev_table[] = {
1313         { .ctl_name = 0 }
1314 };
1315
1316 static DEFINE_SPINLOCK(sysctl_lock);
1317
1318 /* called under sysctl_lock */
1319 static int use_table(struct ctl_table_header *p)
1320 {
1321         if (unlikely(p->unregistering))
1322                 return 0;
1323         p->used++;
1324         return 1;
1325 }
1326
1327 /* called under sysctl_lock */
1328 static void unuse_table(struct ctl_table_header *p)
1329 {
1330         if (!--p->used)
1331                 if (unlikely(p->unregistering))
1332                         complete(p->unregistering);
1333 }
1334
1335 /* called under sysctl_lock, will reacquire if has to wait */
1336 static void start_unregistering(struct ctl_table_header *p)
1337 {
1338         /*
1339          * if p->used is 0, nobody will ever touch that entry again;
1340          * we'll eliminate all paths to it before dropping sysctl_lock
1341          */
1342         if (unlikely(p->used)) {
1343                 struct completion wait;
1344                 init_completion(&wait);
1345                 p->unregistering = &wait;
1346                 spin_unlock(&sysctl_lock);
1347                 wait_for_completion(&wait);
1348                 spin_lock(&sysctl_lock);
1349         }
1350         /*
1351          * do not remove from the list until nobody holds it; walking the
1352          * list in do_sysctl() relies on that.
1353          */
1354         list_del_init(&p->ctl_entry);
1355 }
1356
1357 void sysctl_head_finish(struct ctl_table_header *head)
1358 {
1359         if (!head)
1360                 return;
1361         spin_lock(&sysctl_lock);
1362         unuse_table(head);
1363         spin_unlock(&sysctl_lock);
1364 }
1365
1366 static struct list_head *
1367 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1368 {
1369         struct list_head *header_list;
1370         header_list = &root->header_list;
1371         if (root->lookup)
1372                 header_list = root->lookup(root, namespaces);
1373         return header_list;
1374 }
1375
1376 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1377                                             struct ctl_table_header *prev)
1378 {
1379         struct ctl_table_root *root;
1380         struct list_head *header_list;
1381         struct ctl_table_header *head;
1382         struct list_head *tmp;
1383
1384         spin_lock(&sysctl_lock);
1385         if (prev) {
1386                 head = prev;
1387                 tmp = &prev->ctl_entry;
1388                 unuse_table(prev);
1389                 goto next;
1390         }
1391         tmp = &root_table_header.ctl_entry;
1392         for (;;) {
1393                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1394
1395                 if (!use_table(head))
1396                         goto next;
1397                 spin_unlock(&sysctl_lock);
1398                 return head;
1399         next:
1400                 root = head->root;
1401                 tmp = tmp->next;
1402                 header_list = lookup_header_list(root, namespaces);
1403                 if (tmp != header_list)
1404                         continue;
1405
1406                 do {
1407                         root = list_entry(root->root_list.next,
1408                                         struct ctl_table_root, root_list);
1409                         if (root == &sysctl_table_root)
1410                                 goto out;
1411                         header_list = lookup_header_list(root, namespaces);
1412                 } while (list_empty(header_list));
1413                 tmp = header_list->next;
1414         }
1415 out:
1416         spin_unlock(&sysctl_lock);
1417         return NULL;
1418 }
1419
1420 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1421 {
1422         return __sysctl_head_next(current->nsproxy, prev);
1423 }
1424
1425 void register_sysctl_root(struct ctl_table_root *root)
1426 {
1427         spin_lock(&sysctl_lock);
1428         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1429         spin_unlock(&sysctl_lock);
1430 }
1431
1432 #ifdef CONFIG_SYSCTL_SYSCALL
1433 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1434                void __user *newval, size_t newlen)
1435 {
1436         struct ctl_table_header *head;
1437         int error = -ENOTDIR;
1438
1439         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1440                 return -ENOTDIR;
1441         if (oldval) {
1442                 int old_len;
1443                 if (!oldlenp || get_user(old_len, oldlenp))
1444                         return -EFAULT;
1445         }
1446
1447         for (head = sysctl_head_next(NULL); head;
1448                         head = sysctl_head_next(head)) {
1449                 error = parse_table(name, nlen, oldval, oldlenp,
1450                                         newval, newlen, head->ctl_table);
1451                 if (error != -ENOTDIR) {
1452                         sysctl_head_finish(head);
1453                         break;
1454                 }
1455         }
1456         return error;
1457 }
1458
1459 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1460 {
1461         struct __sysctl_args tmp;
1462         int error;
1463
1464         if (copy_from_user(&tmp, args, sizeof(tmp)))
1465                 return -EFAULT;
1466
1467         error = deprecated_sysctl_warning(&tmp);
1468         if (error)
1469                 goto out;
1470
1471         lock_kernel();
1472         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1473                           tmp.newval, tmp.newlen);
1474         unlock_kernel();
1475 out:
1476         return error;
1477 }
1478 #endif /* CONFIG_SYSCTL_SYSCALL */
1479
1480 /*
1481  * sysctl_perm does NOT grant the superuser all rights automatically, because
1482  * some sysctl variables are readonly even to root.
1483  */
1484
1485 static int test_perm(int mode, int op)
1486 {
1487         if (!current->euid)
1488                 mode >>= 6;
1489         else if (in_egroup_p(0))
1490                 mode >>= 3;
1491         if ((mode & op & 0007) == op)
1492                 return 0;
1493         return -EACCES;
1494 }
1495
1496 int sysctl_perm(struct ctl_table *table, int op)
1497 {
1498         int error;
1499         error = security_sysctl(table, op);
1500         if (error)
1501                 return error;
1502         return test_perm(table->mode, op);
1503 }
1504
1505 #ifdef CONFIG_SYSCTL_SYSCALL
1506 static int parse_table(int __user *name, int nlen,
1507                        void __user *oldval, size_t __user *oldlenp,
1508                        void __user *newval, size_t newlen,
1509                        struct ctl_table *table)
1510 {
1511         int n;
1512 repeat:
1513         if (!nlen)
1514                 return -ENOTDIR;
1515         if (get_user(n, name))
1516                 return -EFAULT;
1517         for ( ; table->ctl_name || table->procname; table++) {
1518                 if (!table->ctl_name)
1519                         continue;
1520                 if (n == table->ctl_name) {
1521                         int error;
1522                         if (table->child) {
1523                                 if (sysctl_perm(table, 001))
1524                                         return -EPERM;
1525                                 name++;
1526                                 nlen--;
1527                                 table = table->child;
1528                                 goto repeat;
1529                         }
1530                         error = do_sysctl_strategy(table, name, nlen,
1531                                                    oldval, oldlenp,
1532                                                    newval, newlen);
1533                         return error;
1534                 }
1535         }
1536         return -ENOTDIR;
1537 }
1538
1539 /* Perform the actual read/write of a sysctl table entry. */
1540 int do_sysctl_strategy (struct ctl_table *table,
1541                         int __user *name, int nlen,
1542                         void __user *oldval, size_t __user *oldlenp,
1543                         void __user *newval, size_t newlen)
1544 {
1545         int op = 0, rc;
1546
1547         if (oldval)
1548                 op |= 004;
1549         if (newval)
1550                 op |= 002;
1551         if (sysctl_perm(table, op))
1552                 return -EPERM;
1553
1554         if (table->strategy) {
1555                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1556                                      newval, newlen);
1557                 if (rc < 0)
1558                         return rc;
1559                 if (rc > 0)
1560                         return 0;
1561         }
1562
1563         /* If there is no strategy routine, or if the strategy returns
1564          * zero, proceed with automatic r/w */
1565         if (table->data && table->maxlen) {
1566                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1567                                  newval, newlen);
1568                 if (rc < 0)
1569                         return rc;
1570         }
1571         return 0;
1572 }
1573 #endif /* CONFIG_SYSCTL_SYSCALL */
1574
1575 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1576 {
1577         for (; table->ctl_name || table->procname; table++) {
1578                 table->parent = parent;
1579                 if (table->child)
1580                         sysctl_set_parent(table, table->child);
1581         }
1582 }
1583
1584 static __init int sysctl_init(void)
1585 {
1586         int err;
1587         sysctl_set_parent(NULL, root_table);
1588         err = sysctl_check_table(current->nsproxy, root_table);
1589         return 0;
1590 }
1591
1592 core_initcall(sysctl_init);
1593
1594 /**
1595  * __register_sysctl_paths - register a sysctl hierarchy
1596  * @root: List of sysctl headers to register on
1597  * @namespaces: Data to compute which lists of sysctl entries are visible
1598  * @path: The path to the directory the sysctl table is in.
1599  * @table: the top-level table structure
1600  *
1601  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1602  * array. A completely 0 filled entry terminates the table.
1603  *
1604  * The members of the &struct ctl_table structure are used as follows:
1605  *
1606  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1607  *            must be unique within that level of sysctl
1608  *
1609  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1610  *            enter a sysctl file
1611  *
1612  * data - a pointer to data for use by proc_handler
1613  *
1614  * maxlen - the maximum size in bytes of the data
1615  *
1616  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1617  *
1618  * child - a pointer to the child sysctl table if this entry is a directory, or
1619  *         %NULL.
1620  *
1621  * proc_handler - the text handler routine (described below)
1622  *
1623  * strategy - the strategy routine (described below)
1624  *
1625  * de - for internal use by the sysctl routines
1626  *
1627  * extra1, extra2 - extra pointers usable by the proc handler routines
1628  *
1629  * Leaf nodes in the sysctl tree will be represented by a single file
1630  * under /proc; non-leaf nodes will be represented by directories.
1631  *
1632  * sysctl(2) can automatically manage read and write requests through
1633  * the sysctl table.  The data and maxlen fields of the ctl_table
1634  * struct enable minimal validation of the values being written to be
1635  * performed, and the mode field allows minimal authentication.
1636  *
1637  * More sophisticated management can be enabled by the provision of a
1638  * strategy routine with the table entry.  This will be called before
1639  * any automatic read or write of the data is performed.
1640  *
1641  * The strategy routine may return
1642  *
1643  * < 0 - Error occurred (error is passed to user process)
1644  *
1645  * 0   - OK - proceed with automatic read or write.
1646  *
1647  * > 0 - OK - read or write has been done by the strategy routine, so
1648  *       return immediately.
1649  *
1650  * There must be a proc_handler routine for any terminal nodes
1651  * mirrored under /proc/sys (non-terminals are handled by a built-in
1652  * directory handler).  Several default handlers are available to
1653  * cover common cases -
1654  *
1655  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1656  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1657  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1658  *
1659  * It is the handler's job to read the input buffer from user memory
1660  * and process it. The handler should return 0 on success.
1661  *
1662  * This routine returns %NULL on a failure to register, and a pointer
1663  * to the table header on success.
1664  */
1665 struct ctl_table_header *__register_sysctl_paths(
1666         struct ctl_table_root *root,
1667         struct nsproxy *namespaces,
1668         const struct ctl_path *path, struct ctl_table *table)
1669 {
1670         struct list_head *header_list;
1671         struct ctl_table_header *header;
1672         struct ctl_table *new, **prevp;
1673         unsigned int n, npath;
1674
1675         /* Count the path components */
1676         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1677                 ;
1678
1679         /*
1680          * For each path component, allocate a 2-element ctl_table array.
1681          * The first array element will be filled with the sysctl entry
1682          * for this, the second will be the sentinel (ctl_name == 0).
1683          *
1684          * We allocate everything in one go so that we don't have to
1685          * worry about freeing additional memory in unregister_sysctl_table.
1686          */
1687         header = kzalloc(sizeof(struct ctl_table_header) +
1688                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1689         if (!header)
1690                 return NULL;
1691
1692         new = (struct ctl_table *) (header + 1);
1693
1694         /* Now connect the dots */
1695         prevp = &header->ctl_table;
1696         for (n = 0; n < npath; ++n, ++path) {
1697                 /* Copy the procname */
1698                 new->procname = path->procname;
1699                 new->ctl_name = path->ctl_name;
1700                 new->mode     = 0555;
1701
1702                 *prevp = new;
1703                 prevp = &new->child;
1704
1705                 new += 2;
1706         }
1707         *prevp = table;
1708         header->ctl_table_arg = table;
1709
1710         INIT_LIST_HEAD(&header->ctl_entry);
1711         header->used = 0;
1712         header->unregistering = NULL;
1713         header->root = root;
1714         sysctl_set_parent(NULL, header->ctl_table);
1715         if (sysctl_check_table(namespaces, header->ctl_table)) {
1716                 kfree(header);
1717                 return NULL;
1718         }
1719         spin_lock(&sysctl_lock);
1720         header_list = lookup_header_list(root, namespaces);
1721         list_add_tail(&header->ctl_entry, header_list);
1722         spin_unlock(&sysctl_lock);
1723
1724         return header;
1725 }
1726
1727 /**
1728  * register_sysctl_table_path - register a sysctl table hierarchy
1729  * @path: The path to the directory the sysctl table is in.
1730  * @table: the top-level table structure
1731  *
1732  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1733  * array. A completely 0 filled entry terminates the table.
1734  *
1735  * See __register_sysctl_paths for more details.
1736  */
1737 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1738                                                 struct ctl_table *table)
1739 {
1740         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1741                                         path, table);
1742 }
1743
1744 /**
1745  * register_sysctl_table - register a sysctl table hierarchy
1746  * @table: the top-level table structure
1747  *
1748  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1749  * array. A completely 0 filled entry terminates the table.
1750  *
1751  * See register_sysctl_paths for more details.
1752  */
1753 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1754 {
1755         static const struct ctl_path null_path[] = { {} };
1756
1757         return register_sysctl_paths(null_path, table);
1758 }
1759
1760 /**
1761  * unregister_sysctl_table - unregister a sysctl table hierarchy
1762  * @header: the header returned from register_sysctl_table
1763  *
1764  * Unregisters the sysctl table and all children. proc entries may not
1765  * actually be removed until they are no longer used by anyone.
1766  */
1767 void unregister_sysctl_table(struct ctl_table_header * header)
1768 {
1769         might_sleep();
1770
1771         if (header == NULL)
1772                 return;
1773
1774         spin_lock(&sysctl_lock);
1775         start_unregistering(header);
1776         spin_unlock(&sysctl_lock);
1777         kfree(header);
1778 }
1779
1780 #else /* !CONFIG_SYSCTL */
1781 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1782 {
1783         return NULL;
1784 }
1785
1786 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1787                                                     struct ctl_table *table)
1788 {
1789         return NULL;
1790 }
1791
1792 void unregister_sysctl_table(struct ctl_table_header * table)
1793 {
1794 }
1795
1796 #endif /* CONFIG_SYSCTL */
1797
1798 /*
1799  * /proc/sys support
1800  */
1801
1802 #ifdef CONFIG_PROC_SYSCTL
1803
1804 static int _proc_do_string(void* data, int maxlen, int write,
1805                            struct file *filp, void __user *buffer,
1806                            size_t *lenp, loff_t *ppos)
1807 {
1808         size_t len;
1809         char __user *p;
1810         char c;
1811
1812         if (!data || !maxlen || !*lenp) {
1813                 *lenp = 0;
1814                 return 0;
1815         }
1816
1817         if (write) {
1818                 len = 0;
1819                 p = buffer;
1820                 while (len < *lenp) {
1821                         if (get_user(c, p++))
1822                                 return -EFAULT;
1823                         if (c == 0 || c == '\n')
1824                                 break;
1825                         len++;
1826                 }
1827                 if (len >= maxlen)
1828                         len = maxlen-1;
1829                 if(copy_from_user(data, buffer, len))
1830                         return -EFAULT;
1831                 ((char *) data)[len] = 0;
1832                 *ppos += *lenp;
1833         } else {
1834                 len = strlen(data);
1835                 if (len > maxlen)
1836                         len = maxlen;
1837
1838                 if (*ppos > len) {
1839                         *lenp = 0;
1840                         return 0;
1841                 }
1842
1843                 data += *ppos;
1844                 len  -= *ppos;
1845
1846                 if (len > *lenp)
1847                         len = *lenp;
1848                 if (len)
1849                         if(copy_to_user(buffer, data, len))
1850                                 return -EFAULT;
1851                 if (len < *lenp) {
1852                         if(put_user('\n', ((char __user *) buffer) + len))
1853                                 return -EFAULT;
1854                         len++;
1855                 }
1856                 *lenp = len;
1857                 *ppos += len;
1858         }
1859         return 0;
1860 }
1861
1862 /**
1863  * proc_dostring - read a string sysctl
1864  * @table: the sysctl table
1865  * @write: %TRUE if this is a write to the sysctl file
1866  * @filp: the file structure
1867  * @buffer: the user buffer
1868  * @lenp: the size of the user buffer
1869  * @ppos: file position
1870  *
1871  * Reads/writes a string from/to the user buffer. If the kernel
1872  * buffer provided is not large enough to hold the string, the
1873  * string is truncated. The copied string is %NULL-terminated.
1874  * If the string is being read by the user process, it is copied
1875  * and a newline '\n' is added. It is truncated if the buffer is
1876  * not large enough.
1877  *
1878  * Returns 0 on success.
1879  */
1880 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1881                   void __user *buffer, size_t *lenp, loff_t *ppos)
1882 {
1883         return _proc_do_string(table->data, table->maxlen, write, filp,
1884                                buffer, lenp, ppos);
1885 }
1886
1887
1888 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1889                                  int *valp,
1890                                  int write, void *data)
1891 {
1892         if (write) {
1893                 *valp = *negp ? -*lvalp : *lvalp;
1894         } else {
1895                 int val = *valp;
1896                 if (val < 0) {
1897                         *negp = -1;
1898                         *lvalp = (unsigned long)-val;
1899                 } else {
1900                         *negp = 0;
1901                         *lvalp = (unsigned long)val;
1902                 }
1903         }
1904         return 0;
1905 }
1906
1907 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1908                   int write, struct file *filp, void __user *buffer,
1909                   size_t *lenp, loff_t *ppos,
1910                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1911                               int write, void *data),
1912                   void *data)
1913 {
1914 #define TMPBUFLEN 21
1915         int *i, vleft, first=1, neg, val;
1916         unsigned long lval;
1917         size_t left, len;
1918
1919         char buf[TMPBUFLEN], *p;
1920         char __user *s = buffer;
1921
1922         if (!tbl_data || !table->maxlen || !*lenp ||
1923             (*ppos && !write)) {
1924                 *lenp = 0;
1925                 return 0;
1926         }
1927
1928         i = (int *) tbl_data;
1929         vleft = table->maxlen / sizeof(*i);
1930         left = *lenp;
1931
1932         if (!conv)
1933                 conv = do_proc_dointvec_conv;
1934
1935         for (; left && vleft--; i++, first=0) {
1936                 if (write) {
1937                         while (left) {
1938                                 char c;
1939                                 if (get_user(c, s))
1940                                         return -EFAULT;
1941                                 if (!isspace(c))
1942                                         break;
1943                                 left--;
1944                                 s++;
1945                         }
1946                         if (!left)
1947                                 break;
1948                         neg = 0;
1949                         len = left;
1950                         if (len > sizeof(buf) - 1)
1951                                 len = sizeof(buf) - 1;
1952                         if (copy_from_user(buf, s, len))
1953                                 return -EFAULT;
1954                         buf[len] = 0;
1955                         p = buf;
1956                         if (*p == '-' && left > 1) {
1957                                 neg = 1;
1958                                 p++;
1959                         }
1960                         if (*p < '0' || *p > '9')
1961                                 break;
1962
1963                         lval = simple_strtoul(p, &p, 0);
1964
1965                         len = p-buf;
1966                         if ((len < left) && *p && !isspace(*p))
1967                                 break;
1968                         if (neg)
1969                                 val = -val;
1970                         s += len;
1971                         left -= len;
1972
1973                         if (conv(&neg, &lval, i, 1, data))
1974                                 break;
1975                 } else {
1976                         p = buf;
1977                         if (!first)
1978                                 *p++ = '\t';
1979
1980                         if (conv(&neg, &lval, i, 0, data))
1981                                 break;
1982
1983                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1984                         len = strlen(buf);
1985                         if (len > left)
1986                                 len = left;
1987                         if(copy_to_user(s, buf, len))
1988                                 return -EFAULT;
1989                         left -= len;
1990                         s += len;
1991                 }
1992         }
1993
1994         if (!write && !first && left) {
1995                 if(put_user('\n', s))
1996                         return -EFAULT;
1997                 left--, s++;
1998         }
1999         if (write) {
2000                 while (left) {
2001                         char c;
2002                         if (get_user(c, s++))
2003                                 return -EFAULT;
2004                         if (!isspace(c))
2005                                 break;
2006                         left--;
2007                 }
2008         }
2009         if (write && first)
2010                 return -EINVAL;
2011         *lenp -= left;
2012         *ppos += *lenp;
2013         return 0;
2014 #undef TMPBUFLEN
2015 }
2016
2017 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2018                   void __user *buffer, size_t *lenp, loff_t *ppos,
2019                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2020                               int write, void *data),
2021                   void *data)
2022 {
2023         return __do_proc_dointvec(table->data, table, write, filp,
2024                         buffer, lenp, ppos, conv, data);
2025 }
2026
2027 /**
2028  * proc_dointvec - read a vector of integers
2029  * @table: the sysctl table
2030  * @write: %TRUE if this is a write to the sysctl file
2031  * @filp: the file structure
2032  * @buffer: the user buffer
2033  * @lenp: the size of the user buffer
2034  * @ppos: file position
2035  *
2036  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2037  * values from/to the user buffer, treated as an ASCII string.
2038  *
2039  * Returns 0 on success.
2040  */
2041 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2042                      void __user *buffer, size_t *lenp, loff_t *ppos)
2043 {
2044     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2045                             NULL,NULL);
2046 }
2047
2048 #define OP_SET  0
2049 #define OP_AND  1
2050 #define OP_OR   2
2051
2052 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2053                                       int *valp,
2054                                       int write, void *data)
2055 {
2056         int op = *(int *)data;
2057         if (write) {
2058                 int val = *negp ? -*lvalp : *lvalp;
2059                 switch(op) {
2060                 case OP_SET:    *valp = val; break;
2061                 case OP_AND:    *valp &= val; break;
2062                 case OP_OR:     *valp |= val; break;
2063                 }
2064         } else {
2065                 int val = *valp;
2066                 if (val < 0) {
2067                         *negp = -1;
2068                         *lvalp = (unsigned long)-val;
2069                 } else {
2070                         *negp = 0;
2071                         *lvalp = (unsigned long)val;
2072                 }
2073         }
2074         return 0;
2075 }
2076
2077 /*
2078  *      Taint values can only be increased
2079  */
2080 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2081                                void __user *buffer, size_t *lenp, loff_t *ppos)
2082 {
2083         int op;
2084
2085         if (write && !capable(CAP_SYS_ADMIN))
2086                 return -EPERM;
2087
2088         op = OP_OR;
2089         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2090                                 do_proc_dointvec_bset_conv,&op);
2091 }
2092
2093 struct do_proc_dointvec_minmax_conv_param {
2094         int *min;
2095         int *max;
2096 };
2097
2098 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2099                                         int *valp,
2100                                         int write, void *data)
2101 {
2102         struct do_proc_dointvec_minmax_conv_param *param = data;
2103         if (write) {
2104                 int val = *negp ? -*lvalp : *lvalp;
2105                 if ((param->min && *param->min > val) ||
2106                     (param->max && *param->max < val))
2107                         return -EINVAL;
2108                 *valp = val;
2109         } else {
2110                 int val = *valp;
2111                 if (val < 0) {
2112                         *negp = -1;
2113                         *lvalp = (unsigned long)-val;
2114                 } else {
2115                         *negp = 0;
2116                         *lvalp = (unsigned long)val;
2117                 }
2118         }
2119         return 0;
2120 }
2121
2122 /**
2123  * proc_dointvec_minmax - read a vector of integers with min/max values
2124  * @table: the sysctl table
2125  * @write: %TRUE if this is a write to the sysctl file
2126  * @filp: the file structure
2127  * @buffer: the user buffer
2128  * @lenp: the size of the user buffer
2129  * @ppos: file position
2130  *
2131  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2132  * values from/to the user buffer, treated as an ASCII string.
2133  *
2134  * This routine will ensure the values are within the range specified by
2135  * table->extra1 (min) and table->extra2 (max).
2136  *
2137  * Returns 0 on success.
2138  */
2139 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2140                   void __user *buffer, size_t *lenp, loff_t *ppos)
2141 {
2142         struct do_proc_dointvec_minmax_conv_param param = {
2143                 .min = (int *) table->extra1,
2144                 .max = (int *) table->extra2,
2145         };
2146         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2147                                 do_proc_dointvec_minmax_conv, &param);
2148 }
2149
2150 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2151                                      struct file *filp,
2152                                      void __user *buffer,
2153                                      size_t *lenp, loff_t *ppos,
2154                                      unsigned long convmul,
2155                                      unsigned long convdiv)
2156 {
2157 #define TMPBUFLEN 21
2158         unsigned long *i, *min, *max, val;
2159         int vleft, first=1, neg;
2160         size_t len, left;
2161         char buf[TMPBUFLEN], *p;
2162         char __user *s = buffer;
2163
2164         if (!data || !table->maxlen || !*lenp ||
2165             (*ppos && !write)) {
2166                 *lenp = 0;
2167                 return 0;
2168         }
2169
2170         i = (unsigned long *) data;
2171         min = (unsigned long *) table->extra1;
2172         max = (unsigned long *) table->extra2;
2173         vleft = table->maxlen / sizeof(unsigned long);
2174         left = *lenp;
2175
2176         for (; left && vleft--; i++, min++, max++, first=0) {
2177                 if (write) {
2178                         while (left) {
2179                                 char c;
2180                                 if (get_user(c, s))
2181                                         return -EFAULT;
2182                                 if (!isspace(c))
2183                                         break;
2184                                 left--;
2185                                 s++;
2186                         }
2187                         if (!left)
2188                                 break;
2189                         neg = 0;
2190                         len = left;
2191                         if (len > TMPBUFLEN-1)
2192                                 len = TMPBUFLEN-1;
2193                         if (copy_from_user(buf, s, len))
2194                                 return -EFAULT;
2195                         buf[len] = 0;
2196                         p = buf;
2197                         if (*p == '-' && left > 1) {
2198                                 neg = 1;
2199                                 p++;
2200                         }
2201                         if (*p < '0' || *p > '9')
2202                                 break;
2203                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2204                         len = p-buf;
2205                         if ((len < left) && *p && !isspace(*p))
2206                                 break;
2207                         if (neg)
2208                                 val = -val;
2209                         s += len;
2210                         left -= len;
2211
2212                         if(neg)
2213                                 continue;
2214                         if ((min && val < *min) || (max && val > *max))
2215                                 continue;
2216                         *i = val;
2217                 } else {
2218                         p = buf;
2219                         if (!first)
2220                                 *p++ = '\t';
2221                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2222                         len = strlen(buf);
2223                         if (len > left)
2224                                 len = left;
2225                         if(copy_to_user(s, buf, len))
2226                                 return -EFAULT;
2227                         left -= len;
2228                         s += len;
2229                 }
2230         }
2231
2232         if (!write && !first && left) {
2233                 if(put_user('\n', s))
2234                         return -EFAULT;
2235                 left--, s++;
2236         }
2237         if (write) {
2238                 while (left) {
2239                         char c;
2240                         if (get_user(c, s++))
2241                                 return -EFAULT;
2242                         if (!isspace(c))
2243                                 break;
2244                         left--;
2245                 }
2246         }
2247         if (write && first)
2248                 return -EINVAL;
2249         *lenp -= left;
2250         *ppos += *lenp;
2251         return 0;
2252 #undef TMPBUFLEN
2253 }
2254
2255 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2256                                      struct file *filp,
2257                                      void __user *buffer,
2258                                      size_t *lenp, loff_t *ppos,
2259                                      unsigned long convmul,
2260                                      unsigned long convdiv)
2261 {
2262         return __do_proc_doulongvec_minmax(table->data, table, write,
2263                         filp, buffer, lenp, ppos, convmul, convdiv);
2264 }
2265
2266 /**
2267  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2268  * @table: the sysctl table
2269  * @write: %TRUE if this is a write to the sysctl file
2270  * @filp: the file structure
2271  * @buffer: the user buffer
2272  * @lenp: the size of the user buffer
2273  * @ppos: file position
2274  *
2275  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2276  * values from/to the user buffer, treated as an ASCII string.
2277  *
2278  * This routine will ensure the values are within the range specified by
2279  * table->extra1 (min) and table->extra2 (max).
2280  *
2281  * Returns 0 on success.
2282  */
2283 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2284                            void __user *buffer, size_t *lenp, loff_t *ppos)
2285 {
2286     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2287 }
2288
2289 /**
2290  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2291  * @table: the sysctl table
2292  * @write: %TRUE if this is a write to the sysctl file
2293  * @filp: the file structure
2294  * @buffer: the user buffer
2295  * @lenp: the size of the user buffer
2296  * @ppos: file position
2297  *
2298  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2299  * values from/to the user buffer, treated as an ASCII string. The values
2300  * are treated as milliseconds, and converted to jiffies when they are stored.
2301  *
2302  * This routine will ensure the values are within the range specified by
2303  * table->extra1 (min) and table->extra2 (max).
2304  *
2305  * Returns 0 on success.
2306  */
2307 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2308                                       struct file *filp,
2309                                       void __user *buffer,
2310                                       size_t *lenp, loff_t *ppos)
2311 {
2312     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2313                                      lenp, ppos, HZ, 1000l);
2314 }
2315
2316
2317 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2318                                          int *valp,
2319                                          int write, void *data)
2320 {
2321         if (write) {
2322                 if (*lvalp > LONG_MAX / HZ)
2323                         return 1;
2324                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2325         } else {
2326                 int val = *valp;
2327                 unsigned long lval;
2328                 if (val < 0) {
2329                         *negp = -1;
2330                         lval = (unsigned long)-val;
2331                 } else {
2332                         *negp = 0;
2333                         lval = (unsigned long)val;
2334                 }
2335                 *lvalp = lval / HZ;
2336         }
2337         return 0;
2338 }
2339
2340 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2341                                                 int *valp,
2342                                                 int write, void *data)
2343 {
2344         if (write) {
2345                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2346                         return 1;
2347                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2348         } else {
2349                 int val = *valp;
2350                 unsigned long lval;
2351                 if (val < 0) {
2352                         *negp = -1;
2353                         lval = (unsigned long)-val;
2354                 } else {
2355                         *negp = 0;
2356                         lval = (unsigned long)val;
2357                 }
2358                 *lvalp = jiffies_to_clock_t(lval);
2359         }
2360         return 0;
2361 }
2362
2363 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2364                                             int *valp,
2365                                             int write, void *data)
2366 {
2367         if (write) {
2368                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2369         } else {
2370                 int val = *valp;
2371                 unsigned long lval;
2372                 if (val < 0) {
2373                         *negp = -1;
2374                         lval = (unsigned long)-val;
2375                 } else {
2376                         *negp = 0;
2377                         lval = (unsigned long)val;
2378                 }
2379                 *lvalp = jiffies_to_msecs(lval);
2380         }
2381         return 0;
2382 }
2383
2384 /**
2385  * proc_dointvec_jiffies - read a vector of integers as seconds
2386  * @table: the sysctl table
2387  * @write: %TRUE if this is a write to the sysctl file
2388  * @filp: the file structure
2389  * @buffer: the user buffer
2390  * @lenp: the size of the user buffer
2391  * @ppos: file position
2392  *
2393  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2394  * values from/to the user buffer, treated as an ASCII string.
2395  * The values read are assumed to be in seconds, and are converted into
2396  * jiffies.
2397  *
2398  * Returns 0 on success.
2399  */
2400 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2401                           void __user *buffer, size_t *lenp, loff_t *ppos)
2402 {
2403     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2404                             do_proc_dointvec_jiffies_conv,NULL);
2405 }
2406
2407 /**
2408  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2409  * @table: the sysctl table
2410  * @write: %TRUE if this is a write to the sysctl file
2411  * @filp: the file structure
2412  * @buffer: the user buffer
2413  * @lenp: the size of the user buffer
2414  * @ppos: pointer to the file position
2415  *
2416  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2417  * values from/to the user buffer, treated as an ASCII string.
2418  * The values read are assumed to be in 1/USER_HZ seconds, and
2419  * are converted into jiffies.
2420  *
2421  * Returns 0 on success.
2422  */
2423 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2424                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2425 {
2426     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2427                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2428 }
2429
2430 /**
2431  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2432  * @table: the sysctl table
2433  * @write: %TRUE if this is a write to the sysctl file
2434  * @filp: the file structure
2435  * @buffer: the user buffer
2436  * @lenp: the size of the user buffer
2437  * @ppos: file position
2438  * @ppos: the current position in the file
2439  *
2440  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2441  * values from/to the user buffer, treated as an ASCII string.
2442  * The values read are assumed to be in 1/1000 seconds, and
2443  * are converted into jiffies.
2444  *
2445  * Returns 0 on success.
2446  */
2447 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2448                              void __user *buffer, size_t *lenp, loff_t *ppos)
2449 {
2450         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2451                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2452 }
2453
2454 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2455                            void __user *buffer, size_t *lenp, loff_t *ppos)
2456 {
2457         struct pid *new_pid;
2458         pid_t tmp;
2459         int r;
2460
2461         tmp = pid_vnr(cad_pid);
2462
2463         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2464                                lenp, ppos, NULL, NULL);
2465         if (r || !write)
2466                 return r;
2467
2468         new_pid = find_get_pid(tmp);
2469         if (!new_pid)
2470                 return -ESRCH;
2471
2472         put_pid(xchg(&cad_pid, new_pid));
2473         return 0;
2474 }
2475
2476 #else /* CONFIG_PROC_FS */
2477
2478 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2479                   void __user *buffer, size_t *lenp, loff_t *ppos)
2480 {
2481         return -ENOSYS;
2482 }
2483
2484 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2485                   void __user *buffer, size_t *lenp, loff_t *ppos)
2486 {
2487         return -ENOSYS;
2488 }
2489
2490 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2491                     void __user *buffer, size_t *lenp, loff_t *ppos)
2492 {
2493         return -ENOSYS;
2494 }
2495
2496 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2497                     void __user *buffer, size_t *lenp, loff_t *ppos)
2498 {
2499         return -ENOSYS;
2500 }
2501
2502 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2503                     void __user *buffer, size_t *lenp, loff_t *ppos)
2504 {
2505         return -ENOSYS;
2506 }
2507
2508 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2509                              void __user *buffer, size_t *lenp, loff_t *ppos)
2510 {
2511         return -ENOSYS;
2512 }
2513
2514 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2515                     void __user *buffer, size_t *lenp, loff_t *ppos)
2516 {
2517         return -ENOSYS;
2518 }
2519
2520 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2521                                       struct file *filp,
2522                                       void __user *buffer,
2523                                       size_t *lenp, loff_t *ppos)
2524 {
2525     return -ENOSYS;
2526 }
2527
2528
2529 #endif /* CONFIG_PROC_FS */
2530
2531
2532 #ifdef CONFIG_SYSCTL_SYSCALL
2533 /*
2534  * General sysctl support routines
2535  */
2536
2537 /* The generic sysctl data routine (used if no strategy routine supplied) */
2538 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2539                 void __user *oldval, size_t __user *oldlenp,
2540                 void __user *newval, size_t newlen)
2541 {
2542         size_t len;
2543
2544         /* Get out of I don't have a variable */
2545         if (!table->data || !table->maxlen)
2546                 return -ENOTDIR;
2547
2548         if (oldval && oldlenp) {
2549                 if (get_user(len, oldlenp))
2550                         return -EFAULT;
2551                 if (len) {
2552                         if (len > table->maxlen)
2553                                 len = table->maxlen;
2554                         if (copy_to_user(oldval, table->data, len))
2555                                 return -EFAULT;
2556                         if (put_user(len, oldlenp))
2557                                 return -EFAULT;
2558                 }
2559         }
2560
2561         if (newval && newlen) {
2562                 if (newlen > table->maxlen)
2563                         newlen = table->maxlen;
2564
2565                 if (copy_from_user(table->data, newval, newlen))
2566                         return -EFAULT;
2567         }
2568         return 1;
2569 }
2570
2571 /* The generic string strategy routine: */
2572 int sysctl_string(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         if (!table->data || !table->maxlen)
2577                 return -ENOTDIR;
2578
2579         if (oldval && oldlenp) {
2580                 size_t bufsize;
2581                 if (get_user(bufsize, oldlenp))
2582                         return -EFAULT;
2583                 if (bufsize) {
2584                         size_t len = strlen(table->data), copied;
2585
2586                         /* This shouldn't trigger for a well-formed sysctl */
2587                         if (len > table->maxlen)
2588                                 len = table->maxlen;
2589
2590                         /* Copy up to a max of bufsize-1 bytes of the string */
2591                         copied = (len >= bufsize) ? bufsize - 1 : len;
2592
2593                         if (copy_to_user(oldval, table->data, copied) ||
2594                             put_user(0, (char __user *)(oldval + copied)))
2595                                 return -EFAULT;
2596                         if (put_user(len, oldlenp))
2597                                 return -EFAULT;
2598                 }
2599         }
2600         if (newval && newlen) {
2601                 size_t len = newlen;
2602                 if (len > table->maxlen)
2603                         len = table->maxlen;
2604                 if(copy_from_user(table->data, newval, len))
2605                         return -EFAULT;
2606                 if (len == table->maxlen)
2607                         len--;
2608                 ((char *) table->data)[len] = 0;
2609         }
2610         return 1;
2611 }
2612
2613 /*
2614  * This function makes sure that all of the integers in the vector
2615  * are between the minimum and maximum values given in the arrays
2616  * table->extra1 and table->extra2, respectively.
2617  */
2618 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2619                 void __user *oldval, size_t __user *oldlenp,
2620                 void __user *newval, size_t newlen)
2621 {
2622
2623         if (newval && newlen) {
2624                 int __user *vec = (int __user *) newval;
2625                 int *min = (int *) table->extra1;
2626                 int *max = (int *) table->extra2;
2627                 size_t length;
2628                 int i;
2629
2630                 if (newlen % sizeof(int) != 0)
2631                         return -EINVAL;
2632
2633                 if (!table->extra1 && !table->extra2)
2634                         return 0;
2635
2636                 if (newlen > table->maxlen)
2637                         newlen = table->maxlen;
2638                 length = newlen / sizeof(int);
2639
2640                 for (i = 0; i < length; i++) {
2641                         int value;
2642                         if (get_user(value, vec + i))
2643                                 return -EFAULT;
2644                         if (min && value < min[i])
2645                                 return -EINVAL;
2646                         if (max && value > max[i])
2647                                 return -EINVAL;
2648                 }
2649         }
2650         return 0;
2651 }
2652
2653 /* Strategy function to convert jiffies to seconds */
2654 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2655                 void __user *oldval, size_t __user *oldlenp,
2656                 void __user *newval, size_t newlen)
2657 {
2658         if (oldval && oldlenp) {
2659                 size_t olen;
2660
2661                 if (get_user(olen, oldlenp))
2662                         return -EFAULT;
2663                 if (olen) {
2664                         int val;
2665
2666                         if (olen < sizeof(int))
2667                                 return -EINVAL;
2668
2669                         val = *(int *)(table->data) / HZ;
2670                         if (put_user(val, (int __user *)oldval))
2671                                 return -EFAULT;
2672                         if (put_user(sizeof(int), oldlenp))
2673                                 return -EFAULT;
2674                 }
2675         }
2676         if (newval && newlen) {
2677                 int new;
2678                 if (newlen != sizeof(int))
2679                         return -EINVAL;
2680                 if (get_user(new, (int __user *)newval))
2681                         return -EFAULT;
2682                 *(int *)(table->data) = new*HZ;
2683         }
2684         return 1;
2685 }
2686
2687 /* Strategy function to convert jiffies to seconds */
2688 int sysctl_ms_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 = jiffies_to_msecs(*(int *)(table->data));
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) = msecs_to_jiffies(new);
2717         }
2718         return 1;
2719 }
2720
2721
2722
2723 #else /* CONFIG_SYSCTL_SYSCALL */
2724
2725
2726 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2727 {
2728         struct __sysctl_args tmp;
2729         int error;
2730
2731         if (copy_from_user(&tmp, args, sizeof(tmp)))
2732                 return -EFAULT;
2733
2734         error = deprecated_sysctl_warning(&tmp);
2735
2736         /* If no error reading the parameters then just -ENOSYS ... */
2737         if (!error)
2738                 error = -ENOSYS;
2739
2740         return error;
2741 }
2742
2743 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2744                   void __user *oldval, size_t __user *oldlenp,
2745                   void __user *newval, size_t newlen)
2746 {
2747         return -ENOSYS;
2748 }
2749
2750 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2751                   void __user *oldval, size_t __user *oldlenp,
2752                   void __user *newval, size_t newlen)
2753 {
2754         return -ENOSYS;
2755 }
2756
2757 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2758                 void __user *oldval, size_t __user *oldlenp,
2759                 void __user *newval, size_t newlen)
2760 {
2761         return -ENOSYS;
2762 }
2763
2764 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2765                 void __user *oldval, size_t __user *oldlenp,
2766                 void __user *newval, size_t newlen)
2767 {
2768         return -ENOSYS;
2769 }
2770
2771 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2772                 void __user *oldval, size_t __user *oldlenp,
2773                 void __user *newval, size_t newlen)
2774 {
2775         return -ENOSYS;
2776 }
2777
2778 #endif /* CONFIG_SYSCTL_SYSCALL */
2779
2780 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2781 {
2782         static int msg_count;
2783         int name[CTL_MAXNAME];
2784         int i;
2785
2786         /* Check args->nlen. */
2787         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2788                 return -ENOTDIR;
2789
2790         /* Read in the sysctl name for better debug message logging */
2791         for (i = 0; i < args->nlen; i++)
2792                 if (get_user(name[i], args->name + i))
2793                         return -EFAULT;
2794
2795         /* Ignore accesses to kernel.version */
2796         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2797                 return 0;
2798
2799         if (msg_count < 5) {
2800                 msg_count++;
2801                 printk(KERN_INFO
2802                         "warning: process `%s' used the deprecated sysctl "
2803                         "system call with ", current->comm);
2804                 for (i = 0; i < args->nlen; i++)
2805                         printk("%d.", name[i]);
2806                 printk("\n");
2807         }
2808         return 0;
2809 }
2810
2811 /*
2812  * No sense putting this after each symbol definition, twice,
2813  * exception granted :-)
2814  */
2815 EXPORT_SYMBOL(proc_dointvec);
2816 EXPORT_SYMBOL(proc_dointvec_jiffies);
2817 EXPORT_SYMBOL(proc_dointvec_minmax);
2818 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2819 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2820 EXPORT_SYMBOL(proc_dostring);
2821 EXPORT_SYMBOL(proc_doulongvec_minmax);
2822 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2823 EXPORT_SYMBOL(register_sysctl_table);
2824 EXPORT_SYMBOL(register_sysctl_paths);
2825 EXPORT_SYMBOL(sysctl_intvec);
2826 EXPORT_SYMBOL(sysctl_jiffies);
2827 EXPORT_SYMBOL(sysctl_ms_jiffies);
2828 EXPORT_SYMBOL(sysctl_string);
2829 EXPORT_SYMBOL(sysctl_data);
2830 EXPORT_SYMBOL(unregister_sysctl_table);