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   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/key.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49
  50 #include <asm/uaccess.h>
  51 #include <asm/processor.h>
  52
  53 #ifdef CONFIG_X86
  54 #include <asm/nmi.h>
  55 #include <asm/stacktrace.h>
  56 #include <asm/io.h>
  57 #endif
  58
  59 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  60
  61 #if defined(CONFIG_SYSCTL)
  62
  63 /* External variables not in a header file. */
  64 extern int C_A_D;
  65 extern int print_fatal_signals;
  66 extern int sysctl_overcommit_memory;
  67 extern int sysctl_overcommit_ratio;
  68 extern int sysctl_panic_on_oom;
  69 extern int sysctl_oom_kill_allocating_task;
  70 extern int sysctl_oom_dump_tasks;
  71 extern int max_threads;
  72 extern int core_uses_pid;
  73 extern int suid_dumpable;
  74 extern char core_pattern[];
  75 extern int pid_max;
  76 extern int min_free_kbytes;
  77 extern int pid_max_min, pid_max_max;
  78 extern int sysctl_drop_caches;
  79 extern int percpu_pagelist_fraction;
  80 extern int compat_log;
  81 extern int maps_protect;
  82 extern int sysctl_stat_interval;
  83 extern int latencytop_enabled;
  84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  85
  86 /* Constants used for minimum and  maximum */
  87 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
  88 static int one = 1;
  89 #endif
  90
  91 #ifdef CONFIG_DETECT_SOFTLOCKUP
  92 static int sixty = 60;
  93 #endif
  94
  95 #ifdef CONFIG_MMU
  96 static int two = 2;
  97 #endif
  98
  99 static int zero;
 100 static int one_hundred = 100;
 101
 102 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 103 static int maxolduid = 65535;
 104 static int minolduid;
 105 static int min_percpu_pagelist_fract = 8;
 106
 107 static int ngroups_max = NGROUPS_MAX;
 108
 109 #ifdef CONFIG_KMOD
 110 extern char modprobe_path[];
 111 #endif
 112 #ifdef CONFIG_CHR_DEV_SG
 113 extern int sg_big_buff;
 114 #endif
 115
 116 #ifdef __sparc__
 117 extern char reboot_command [];
 118 extern int stop_a_enabled;
 119 extern int scons_pwroff;
 120 #endif
 121
 122 #ifdef __hppa__
 123 extern int pwrsw_enabled;
 124 extern int unaligned_enabled;
 125 #endif
 126
 127 #ifdef CONFIG_S390
 128 #ifdef CONFIG_MATHEMU
 129 extern int sysctl_ieee_emulation_warnings;
 130 #endif
 131 extern int sysctl_userprocess_debug;
 132 extern int spin_retry;
 133 #endif
 134
 135 extern int sysctl_hz_timer;
 136
 137 #ifdef CONFIG_BSD_PROCESS_ACCT
 138 extern int acct_parm[];
 139 #endif
 140
 141 #ifdef CONFIG_IA64
 142 extern int no_unaligned_warning;
 143 #endif
 144
 145 #ifdef CONFIG_RT_MUTEXES
 146 extern int max_lock_depth;
 147 #endif
 148
 149 #ifdef CONFIG_PROC_SYSCTL
 150 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 151                   void __user *buffer, size_t *lenp, loff_t *ppos);
 152 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 153                                void __user *buffer, size_t *lenp, loff_t *ppos);
 154 #endif
 155
 156 static struct ctl_table root_table[];
 157 static struct ctl_table_root sysctl_table_root;
 158 static struct ctl_table_header root_table_header = {
 159         .ctl_table = root_table,
 160         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 161         .root = &sysctl_table_root,
 162 };
 163 static struct ctl_table_root sysctl_table_root = {
 164         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 165         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 166 };
 167
 168 static struct ctl_table kern_table[];
 169 static struct ctl_table vm_table[];
 170 static struct ctl_table fs_table[];
 171 static struct ctl_table debug_table[];
 172 static struct ctl_table dev_table[];
 173 extern struct ctl_table random_table[];
 174 #ifdef CONFIG_INOTIFY_USER
 175 extern struct ctl_table inotify_table[];
 176 #endif
 177
 178 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 179 int sysctl_legacy_va_layout;
 180 #endif
 181
 182 extern int prove_locking;
 183 extern int lock_stat;
 184
 185 /* The default sysctl tables: */
 186
 187 static struct ctl_table root_table[] = {
 188         {
 189                 .ctl_name       = CTL_KERN,
 190                 .procname       = "kernel",
 191                 .mode           = 0555,
 192                 .child          = kern_table,
 193         },
 194         {
 195                 .ctl_name       = CTL_VM,
 196                 .procname       = "vm",
 197                 .mode           = 0555,
 198                 .child          = vm_table,
 199         },
 200         {
 201                 .ctl_name       = CTL_FS,
 202                 .procname       = "fs",
 203                 .mode           = 0555,
 204                 .child          = fs_table,
 205         },
 206         {
 207                 .ctl_name       = CTL_DEBUG,
 208                 .procname       = "debug",
 209                 .mode           = 0555,
 210                 .child          = debug_table,
 211         },
 212         {
 213                 .ctl_name       = CTL_DEV,
 214                 .procname       = "dev",
 215                 .mode           = 0555,
 216                 .child          = dev_table,
 217         },
 218 /*
 219  * NOTE: do not add new entries to this table unless you have read
 220  * Documentation/sysctl/ctl_unnumbered.txt
 221  */
 222         { .ctl_name = 0 }
 223 };
 224
 225 #ifdef CONFIG_SCHED_DEBUG
 226 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 227 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 228 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 229 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 230 #endif
 231
 232 static struct ctl_table kern_table[] = {
 233 #ifdef CONFIG_SCHED_DEBUG
 234         {
 235                 .ctl_name       = CTL_UNNUMBERED,
 236                 .procname       = "sched_min_granularity_ns",
 237                 .data           = &sysctl_sched_min_granularity,
 238                 .maxlen         = sizeof(unsigned int),
 239                 .mode           = 0644,
 240                 .proc_handler   = &sched_nr_latency_handler,
 241                 .strategy       = &sysctl_intvec,
 242                 .extra1         = &min_sched_granularity_ns,
 243                 .extra2         = &max_sched_granularity_ns,
 244         },
 245         {
 246                 .ctl_name       = CTL_UNNUMBERED,
 247                 .procname       = "sched_latency_ns",
 248                 .data           = &sysctl_sched_latency,
 249                 .maxlen         = sizeof(unsigned int),
 250                 .mode           = 0644,
 251                 .proc_handler   = &sched_nr_latency_handler,
 252                 .strategy       = &sysctl_intvec,
 253                 .extra1         = &min_sched_granularity_ns,
 254                 .extra2         = &max_sched_granularity_ns,
 255         },
 256         {
 257                 .ctl_name       = CTL_UNNUMBERED,
 258                 .procname       = "sched_wakeup_granularity_ns",
 259                 .data           = &sysctl_sched_wakeup_granularity,
 260                 .maxlen         = sizeof(unsigned int),
 261                 .mode           = 0644,
 262                 .proc_handler   = &proc_dointvec_minmax,
 263                 .strategy       = &sysctl_intvec,
 264                 .extra1         = &min_wakeup_granularity_ns,
 265                 .extra2         = &max_wakeup_granularity_ns,
 266         },
 267         {
 268                 .ctl_name       = CTL_UNNUMBERED,
 269                 .procname       = "sched_shares_ratelimit",
 270                 .data           = &sysctl_sched_shares_ratelimit,
 271                 .maxlen         = sizeof(unsigned int),
 272                 .mode           = 0644,
 273                 .proc_handler   = &proc_dointvec,
 274         },
 275         {
 276                 .ctl_name       = CTL_UNNUMBERED,
 277                 .procname       = "sched_child_runs_first",
 278                 .data           = &sysctl_sched_child_runs_first,
 279                 .maxlen         = sizeof(unsigned int),
 280                 .mode           = 0644,
 281                 .proc_handler   = &proc_dointvec,
 282         },
 283         {
 284                 .ctl_name       = CTL_UNNUMBERED,
 285                 .procname       = "sched_features",
 286                 .data           = &sysctl_sched_features,
 287                 .maxlen         = sizeof(unsigned int),
 288                 .mode           = 0644,
 289                 .proc_handler   = &proc_dointvec,
 290         },
 291         {
 292                 .ctl_name       = CTL_UNNUMBERED,
 293                 .procname       = "sched_migration_cost",
 294                 .data           = &sysctl_sched_migration_cost,
 295                 .maxlen         = sizeof(unsigned int),
 296                 .mode           = 0644,
 297                 .proc_handler   = &proc_dointvec,
 298         },
 299         {
 300                 .ctl_name       = CTL_UNNUMBERED,
 301                 .procname       = "sched_nr_migrate",
 302                 .data           = &sysctl_sched_nr_migrate,
 303                 .maxlen         = sizeof(unsigned int),
 304                 .mode           = 0644,
 305                 .proc_handler   = &proc_dointvec,
 306         },
 307 #endif
 308         {
 309                 .ctl_name       = CTL_UNNUMBERED,
 310                 .procname       = "sched_rt_period_us",
 311                 .data           = &sysctl_sched_rt_period,
 312                 .maxlen         = sizeof(unsigned int),
 313                 .mode           = 0644,
 314                 .proc_handler   = &sched_rt_handler,
 315         },
 316         {
 317                 .ctl_name       = CTL_UNNUMBERED,
 318                 .procname       = "sched_rt_runtime_us",
 319                 .data           = &sysctl_sched_rt_runtime,
 320                 .maxlen         = sizeof(int),
 321                 .mode           = 0644,
 322                 .proc_handler   = &sched_rt_handler,
 323         },
 324         {
 325                 .ctl_name       = CTL_UNNUMBERED,
 326                 .procname       = "sched_compat_yield",
 327                 .data           = &sysctl_sched_compat_yield,
 328                 .maxlen         = sizeof(unsigned int),
 329                 .mode           = 0644,
 330                 .proc_handler   = &proc_dointvec,
 331         },
 332 #ifdef CONFIG_PROVE_LOCKING
 333         {
 334                 .ctl_name       = CTL_UNNUMBERED,
 335                 .procname       = "prove_locking",
 336                 .data           = &prove_locking,
 337                 .maxlen         = sizeof(int),
 338                 .mode           = 0644,
 339                 .proc_handler   = &proc_dointvec,
 340         },
 341 #endif
 342 #ifdef CONFIG_LOCK_STAT
 343         {
 344                 .ctl_name       = CTL_UNNUMBERED,
 345                 .procname       = "lock_stat",
 346                 .data           = &lock_stat,
 347                 .maxlen         = sizeof(int),
 348                 .mode           = 0644,
 349                 .proc_handler   = &proc_dointvec,
 350         },
 351 #endif
 352         {
 353                 .ctl_name       = KERN_PANIC,
 354                 .procname       = "panic",
 355                 .data           = &panic_timeout,
 356                 .maxlen         = sizeof(int),
 357                 .mode           = 0644,
 358                 .proc_handler   = &proc_dointvec,
 359         },
 360         {
 361                 .ctl_name       = KERN_CORE_USES_PID,
 362                 .procname       = "core_uses_pid",
 363                 .data           = &core_uses_pid,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = &proc_dointvec,
 367         },
 368         {
 369                 .ctl_name       = KERN_CORE_PATTERN,
 370                 .procname       = "core_pattern",
 371                 .data           = core_pattern,
 372                 .maxlen         = CORENAME_MAX_SIZE,
 373                 .mode           = 0644,
 374                 .proc_handler   = &proc_dostring,
 375                 .strategy       = &sysctl_string,
 376         },
 377 #ifdef CONFIG_PROC_SYSCTL
 378         {
 379                 .procname       = "tainted",
 380                 .data           = &tainted,
 381                 .maxlen         = sizeof(int),
 382                 .mode           = 0644,
 383                 .proc_handler   = &proc_dointvec_taint,
 384         },
 385 #endif
 386 #ifdef CONFIG_LATENCYTOP
 387         {
 388                 .procname       = "latencytop",
 389                 .data           = &latencytop_enabled,
 390                 .maxlen         = sizeof(int),
 391                 .mode           = 0644,
 392                 .proc_handler   = &proc_dointvec,
 393         },
 394 #endif
 395 #ifdef CONFIG_BLK_DEV_INITRD
 396         {
 397                 .ctl_name       = KERN_REALROOTDEV,
 398                 .procname       = "real-root-dev",
 399                 .data           = &real_root_dev,
 400                 .maxlen         = sizeof(int),
 401                 .mode           = 0644,
 402                 .proc_handler   = &proc_dointvec,
 403         },
 404 #endif
 405         {
 406                 .ctl_name       = CTL_UNNUMBERED,
 407                 .procname       = "print-fatal-signals",
 408                 .data           = &print_fatal_signals,
 409                 .maxlen         = sizeof(int),
 410                 .mode           = 0644,
 411                 .proc_handler   = &proc_dointvec,
 412         },
 413 #ifdef __sparc__
 414         {
 415                 .ctl_name       = KERN_SPARC_REBOOT,
 416                 .procname       = "reboot-cmd",
 417                 .data           = reboot_command,
 418                 .maxlen         = 256,
 419                 .mode           = 0644,
 420                 .proc_handler   = &proc_dostring,
 421                 .strategy       = &sysctl_string,
 422         },
 423         {
 424                 .ctl_name       = KERN_SPARC_STOP_A,
 425                 .procname       = "stop-a",
 426                 .data           = &stop_a_enabled,
 427                 .maxlen         = sizeof (int),
 428                 .mode           = 0644,
 429                 .proc_handler   = &proc_dointvec,
 430         },
 431         {
 432                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 433                 .procname       = "scons-poweroff",
 434                 .data           = &scons_pwroff,
 435                 .maxlen         = sizeof (int),
 436                 .mode           = 0644,
 437                 .proc_handler   = &proc_dointvec,
 438         },
 439 #endif
 440 #ifdef __hppa__
 441         {
 442                 .ctl_name       = KERN_HPPA_PWRSW,
 443                 .procname       = "soft-power",
 444                 .data           = &pwrsw_enabled,
 445                 .maxlen         = sizeof (int),
 446                 .mode           = 0644,
 447                 .proc_handler   = &proc_dointvec,
 448         },
 449         {
 450                 .ctl_name       = KERN_HPPA_UNALIGNED,
 451                 .procname       = "unaligned-trap",
 452                 .data           = &unaligned_enabled,
 453                 .maxlen         = sizeof (int),
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dointvec,
 456         },
 457 #endif
 458         {
 459                 .ctl_name       = KERN_CTLALTDEL,
 460                 .procname       = "ctrl-alt-del",
 461                 .data           = &C_A_D,
 462                 .maxlen         = sizeof(int),
 463                 .mode           = 0644,
 464                 .proc_handler   = &proc_dointvec,
 465         },
 466 #ifdef CONFIG_KMOD
 467         {
 468                 .ctl_name       = KERN_MODPROBE,
 469                 .procname       = "modprobe",
 470                 .data           = &modprobe_path,
 471                 .maxlen         = KMOD_PATH_LEN,
 472                 .mode           = 0644,
 473                 .proc_handler   = &proc_dostring,
 474                 .strategy       = &sysctl_string,
 475         },
 476 #endif
 477 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 478         {
 479                 .ctl_name       = KERN_HOTPLUG,
 480                 .procname       = "hotplug",
 481                 .data           = &uevent_helper,
 482                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 483                 .mode           = 0644,
 484                 .proc_handler   = &proc_dostring,
 485                 .strategy       = &sysctl_string,
 486         },
 487 #endif
 488 #ifdef CONFIG_CHR_DEV_SG
 489         {
 490                 .ctl_name       = KERN_SG_BIG_BUFF,
 491                 .procname       = "sg-big-buff",
 492                 .data           = &sg_big_buff,
 493                 .maxlen         = sizeof (int),
 494                 .mode           = 0444,
 495                 .proc_handler   = &proc_dointvec,
 496         },
 497 #endif
 498 #ifdef CONFIG_BSD_PROCESS_ACCT
 499         {
 500                 .ctl_name       = KERN_ACCT,
 501                 .procname       = "acct",
 502                 .data           = &acct_parm,
 503                 .maxlen         = 3*sizeof(int),
 504                 .mode           = 0644,
 505                 .proc_handler   = &proc_dointvec,
 506         },
 507 #endif
 508 #ifdef CONFIG_MAGIC_SYSRQ
 509         {
 510                 .ctl_name       = KERN_SYSRQ,
 511                 .procname       = "sysrq",
 512                 .data           = &__sysrq_enabled,
 513                 .maxlen         = sizeof (int),
 514                 .mode           = 0644,
 515                 .proc_handler   = &proc_dointvec,
 516         },
 517 #endif
 518 #ifdef CONFIG_PROC_SYSCTL
 519         {
 520                 .procname       = "cad_pid",
 521                 .data           = NULL,
 522                 .maxlen         = sizeof (int),
 523                 .mode           = 0600,
 524                 .proc_handler   = &proc_do_cad_pid,
 525         },
 526 #endif
 527         {
 528                 .ctl_name       = KERN_MAX_THREADS,
 529                 .procname       = "threads-max",
 530                 .data           = &max_threads,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = &proc_dointvec,
 534         },
 535         {
 536                 .ctl_name       = KERN_RANDOM,
 537                 .procname       = "random",
 538                 .mode           = 0555,
 539                 .child          = random_table,
 540         },
 541         {
 542                 .ctl_name       = KERN_OVERFLOWUID,
 543                 .procname       = "overflowuid",
 544                 .data           = &overflowuid,
 545                 .maxlen         = sizeof(int),
 546                 .mode           = 0644,
 547                 .proc_handler   = &proc_dointvec_minmax,
 548                 .strategy       = &sysctl_intvec,
 549                 .extra1         = &minolduid,
 550                 .extra2         = &maxolduid,
 551         },
 552         {
 553                 .ctl_name       = KERN_OVERFLOWGID,
 554                 .procname       = "overflowgid",
 555                 .data           = &overflowgid,
 556                 .maxlen         = sizeof(int),
 557                 .mode           = 0644,
 558                 .proc_handler   = &proc_dointvec_minmax,
 559                 .strategy       = &sysctl_intvec,
 560                 .extra1         = &minolduid,
 561                 .extra2         = &maxolduid,
 562         },
 563 #ifdef CONFIG_S390
 564 #ifdef CONFIG_MATHEMU
 565         {
 566                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 567                 .procname       = "ieee_emulation_warnings",
 568                 .data           = &sysctl_ieee_emulation_warnings,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec,
 572         },
 573 #endif
 574 #ifdef CONFIG_NO_IDLE_HZ
 575         {
 576                 .ctl_name       = KERN_HZ_TIMER,
 577                 .procname       = "hz_timer",
 578                 .data           = &sysctl_hz_timer,
 579                 .maxlen         = sizeof(int),
 580                 .mode           = 0644,
 581                 .proc_handler   = &proc_dointvec,
 582         },
 583 #endif
 584         {
 585                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 586                 .procname       = "userprocess_debug",
 587                 .data           = &sysctl_userprocess_debug,
 588                 .maxlen         = sizeof(int),
 589                 .mode           = 0644,
 590                 .proc_handler   = &proc_dointvec,
 591         },
 592 #endif
 593         {
 594                 .ctl_name       = KERN_PIDMAX,
 595                 .procname       = "pid_max",
 596                 .data           = &pid_max,
 597                 .maxlen         = sizeof (int),
 598                 .mode           = 0644,
 599                 .proc_handler   = &proc_dointvec_minmax,
 600                 .strategy       = sysctl_intvec,
 601                 .extra1         = &pid_max_min,
 602                 .extra2         = &pid_max_max,
 603         },
 604         {
 605                 .ctl_name       = KERN_PANIC_ON_OOPS,
 606                 .procname       = "panic_on_oops",
 607                 .data           = &panic_on_oops,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec,
 611         },
 612 #if defined CONFIG_PRINTK
 613         {
 614                 .ctl_name       = KERN_PRINTK,
 615                 .procname       = "printk",
 616                 .data           = &console_loglevel,
 617                 .maxlen         = 4*sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec,
 620         },
 621         {
 622                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 623                 .procname       = "printk_ratelimit",
 624                 .data           = &printk_ratelimit_jiffies,
 625                 .maxlen         = sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = &proc_dointvec_jiffies,
 628                 .strategy       = &sysctl_jiffies,
 629         },
 630         {
 631                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 632                 .procname       = "printk_ratelimit_burst",
 633                 .data           = &printk_ratelimit_burst,
 634                 .maxlen         = sizeof(int),
 635                 .mode           = 0644,
 636                 .proc_handler   = &proc_dointvec,
 637         },
 638 #endif
 639         {
 640                 .ctl_name       = KERN_NGROUPS_MAX,
 641                 .procname       = "ngroups_max",
 642                 .data           = &ngroups_max,
 643                 .maxlen         = sizeof (int),
 644                 .mode           = 0444,
 645                 .proc_handler   = &proc_dointvec,
 646         },
 647 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 648         {
 649                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 650                 .procname       = "unknown_nmi_panic",
 651                 .data           = &unknown_nmi_panic,
 652                 .maxlen         = sizeof (int),
 653                 .mode           = 0644,
 654                 .proc_handler   = &proc_dointvec,
 655         },
 656         {
 657                 .procname       = "nmi_watchdog",
 658                 .data           = &nmi_watchdog_enabled,
 659                 .maxlen         = sizeof (int),
 660                 .mode           = 0644,
 661                 .proc_handler   = &proc_nmi_enabled,
 662         },
 663 #endif
 664 #if defined(CONFIG_X86)
 665         {
 666                 .ctl_name       = KERN_PANIC_ON_NMI,
 667                 .procname       = "panic_on_unrecovered_nmi",
 668                 .data           = &panic_on_unrecovered_nmi,
 669                 .maxlen         = sizeof(int),
 670                 .mode           = 0644,
 671                 .proc_handler   = &proc_dointvec,
 672         },
 673         {
 674                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 675                 .procname       = "bootloader_type",
 676                 .data           = &bootloader_type,
 677                 .maxlen         = sizeof (int),
 678                 .mode           = 0444,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681         {
 682                 .ctl_name       = CTL_UNNUMBERED,
 683                 .procname       = "kstack_depth_to_print",
 684                 .data           = &kstack_depth_to_print,
 685                 .maxlen         = sizeof(int),
 686                 .mode           = 0644,
 687                 .proc_handler   = &proc_dointvec,
 688         },
 689         {
 690                 .ctl_name       = CTL_UNNUMBERED,
 691                 .procname       = "io_delay_type",
 692                 .data           = &io_delay_type,
 693                 .maxlen         = sizeof(int),
 694                 .mode           = 0644,
 695                 .proc_handler   = &proc_dointvec,
 696         },
 697 #endif
 698 #if defined(CONFIG_MMU)
 699         {
 700                 .ctl_name       = KERN_RANDOMIZE,
 701                 .procname       = "randomize_va_space",
 702                 .data           = &randomize_va_space,
 703                 .maxlen         = sizeof(int),
 704                 .mode           = 0644,
 705                 .proc_handler   = &proc_dointvec,
 706         },
 707 #endif
 708 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 709         {
 710                 .ctl_name       = KERN_SPIN_RETRY,
 711                 .procname       = "spin_retry",
 712                 .data           = &spin_retry,
 713                 .maxlen         = sizeof (int),
 714                 .mode           = 0644,
 715                 .proc_handler   = &proc_dointvec,
 716         },
 717 #endif
 718 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 719         {
 720                 .procname       = "acpi_video_flags",
 721                 .data           = &acpi_realmode_flags,
 722                 .maxlen         = sizeof (unsigned long),
 723                 .mode           = 0644,
 724                 .proc_handler   = &proc_doulongvec_minmax,
 725         },
 726 #endif
 727 #ifdef CONFIG_IA64
 728         {
 729                 .ctl_name       = KERN_IA64_UNALIGNED,
 730                 .procname       = "ignore-unaligned-usertrap",
 731                 .data           = &no_unaligned_warning,
 732                 .maxlen         = sizeof (int),
 733                 .mode           = 0644,
 734                 .proc_handler   = &proc_dointvec,
 735         },
 736 #endif
 737 #ifdef CONFIG_DETECT_SOFTLOCKUP
 738         {
 739                 .ctl_name       = CTL_UNNUMBERED,
 740                 .procname       = "softlockup_thresh",
 741                 .data           = &softlockup_thresh,
 742                 .maxlen         = sizeof(unsigned long),
 743                 .mode           = 0644,
 744                 .proc_handler   = &proc_doulongvec_minmax,
 745                 .strategy       = &sysctl_intvec,
 746                 .extra1         = &one,
 747                 .extra2         = &sixty,
 748         },
 749         {
 750                 .ctl_name       = CTL_UNNUMBERED,
 751                 .procname       = "hung_task_check_count",
 752                 .data           = &sysctl_hung_task_check_count,
 753                 .maxlen         = sizeof(unsigned long),
 754                 .mode           = 0644,
 755                 .proc_handler   = &proc_doulongvec_minmax,
 756                 .strategy       = &sysctl_intvec,
 757         },
 758         {
 759                 .ctl_name       = CTL_UNNUMBERED,
 760                 .procname       = "hung_task_timeout_secs",
 761                 .data           = &sysctl_hung_task_timeout_secs,
 762                 .maxlen         = sizeof(unsigned long),
 763                 .mode           = 0644,
 764                 .proc_handler   = &proc_doulongvec_minmax,
 765                 .strategy       = &sysctl_intvec,
 766         },
 767         {
 768                 .ctl_name       = CTL_UNNUMBERED,
 769                 .procname       = "hung_task_warnings",
 770                 .data           = &sysctl_hung_task_warnings,
 771                 .maxlen         = sizeof(unsigned long),
 772                 .mode           = 0644,
 773                 .proc_handler   = &proc_doulongvec_minmax,
 774                 .strategy       = &sysctl_intvec,
 775         },
 776 #endif
 777 #ifdef CONFIG_COMPAT
 778         {
 779                 .ctl_name       = KERN_COMPAT_LOG,
 780                 .procname       = "compat-log",
 781                 .data           = &compat_log,
 782                 .maxlen         = sizeof (int),
 783                 .mode           = 0644,
 784                 .proc_handler   = &proc_dointvec,
 785         },
 786 #endif
 787 #ifdef CONFIG_RT_MUTEXES
 788         {
 789                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 790                 .procname       = "max_lock_depth",
 791                 .data           = &max_lock_depth,
 792                 .maxlen         = sizeof(int),
 793                 .mode           = 0644,
 794                 .proc_handler   = &proc_dointvec,
 795         },
 796 #endif
 797 #ifdef CONFIG_PROC_FS
 798         {
 799                 .ctl_name       = CTL_UNNUMBERED,
 800                 .procname       = "maps_protect",
 801                 .data           = &maps_protect,
 802                 .maxlen         = sizeof(int),
 803                 .mode           = 0644,
 804                 .proc_handler   = &proc_dointvec,
 805         },
 806 #endif
 807         {
 808                 .ctl_name       = CTL_UNNUMBERED,
 809                 .procname       = "poweroff_cmd",
 810                 .data           = &poweroff_cmd,
 811                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 812                 .mode           = 0644,
 813                 .proc_handler   = &proc_dostring,
 814                 .strategy       = &sysctl_string,
 815         },
 816 #ifdef CONFIG_KEYS
 817         {
 818                 .ctl_name       = CTL_UNNUMBERED,
 819                 .procname       = "keys",
 820                 .mode           = 0555,
 821                 .child          = key_sysctls,
 822         },
 823 #endif
 824 /*
 825  * NOTE: do not add new entries to this table unless you have read
 826  * Documentation/sysctl/ctl_unnumbered.txt
 827  */
 828         { .ctl_name = 0 }
 829 };
 830
 831 static struct ctl_table vm_table[] = {
 832         {
 833                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 834                 .procname       = "overcommit_memory",
 835                 .data           = &sysctl_overcommit_memory,
 836                 .maxlen         = sizeof(sysctl_overcommit_memory),
 837                 .mode           = 0644,
 838                 .proc_handler   = &proc_dointvec,
 839         },
 840         {
 841                 .ctl_name       = VM_PANIC_ON_OOM,
 842                 .procname       = "panic_on_oom",
 843                 .data           = &sysctl_panic_on_oom,
 844                 .maxlen         = sizeof(sysctl_panic_on_oom),
 845                 .mode           = 0644,
 846                 .proc_handler   = &proc_dointvec,
 847         },
 848         {
 849                 .ctl_name       = CTL_UNNUMBERED,
 850                 .procname       = "oom_kill_allocating_task",
 851                 .data           = &sysctl_oom_kill_allocating_task,
 852                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 853                 .mode           = 0644,
 854                 .proc_handler   = &proc_dointvec,
 855         },
 856         {
 857                 .ctl_name       = CTL_UNNUMBERED,
 858                 .procname       = "oom_dump_tasks",
 859                 .data           = &sysctl_oom_dump_tasks,
 860                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 861                 .mode           = 0644,
 862                 .proc_handler   = &proc_dointvec,
 863         },
 864         {
 865                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 866                 .procname       = "overcommit_ratio",
 867                 .data           = &sysctl_overcommit_ratio,
 868                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 869                 .mode           = 0644,
 870                 .proc_handler   = &proc_dointvec,
 871         },
 872         {
 873                 .ctl_name       = VM_PAGE_CLUSTER,
 874                 .procname       = "page-cluster",
 875                 .data           = &page_cluster,
 876                 .maxlen         = sizeof(int),
 877                 .mode           = 0644,
 878                 .proc_handler   = &proc_dointvec,
 879         },
 880         {
 881                 .ctl_name       = VM_DIRTY_BACKGROUND,
 882                 .procname       = "dirty_background_ratio",
 883                 .data           = &dirty_background_ratio,
 884                 .maxlen         = sizeof(dirty_background_ratio),
 885                 .mode           = 0644,
 886                 .proc_handler   = &proc_dointvec_minmax,
 887                 .strategy       = &sysctl_intvec,
 888                 .extra1         = &zero,
 889                 .extra2         = &one_hundred,
 890         },
 891         {
 892                 .ctl_name       = VM_DIRTY_RATIO,
 893                 .procname       = "dirty_ratio",
 894                 .data           = &vm_dirty_ratio,
 895                 .maxlen         = sizeof(vm_dirty_ratio),
 896                 .mode           = 0644,
 897                 .proc_handler   = &dirty_ratio_handler,
 898                 .strategy       = &sysctl_intvec,
 899                 .extra1         = &zero,
 900                 .extra2         = &one_hundred,
 901         },
 902         {
 903                 .procname       = "dirty_writeback_centisecs",
 904                 .data           = &dirty_writeback_interval,
 905                 .maxlen         = sizeof(dirty_writeback_interval),
 906                 .mode           = 0644,
 907                 .proc_handler   = &dirty_writeback_centisecs_handler,
 908         },
 909         {
 910                 .procname       = "dirty_expire_centisecs",
 911                 .data           = &dirty_expire_interval,
 912                 .maxlen         = sizeof(dirty_expire_interval),
 913                 .mode           = 0644,
 914                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 915         },
 916         {
 917                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 918                 .procname       = "nr_pdflush_threads",
 919                 .data           = &nr_pdflush_threads,
 920                 .maxlen         = sizeof nr_pdflush_threads,
 921                 .mode           = 0444 /* read-only*/,
 922                 .proc_handler   = &proc_dointvec,
 923         },
 924         {
 925                 .ctl_name       = VM_SWAPPINESS,
 926                 .procname       = "swappiness",
 927                 .data           = &vm_swappiness,
 928                 .maxlen         = sizeof(vm_swappiness),
 929                 .mode           = 0644,
 930                 .proc_handler   = &proc_dointvec_minmax,
 931                 .strategy       = &sysctl_intvec,
 932                 .extra1         = &zero,
 933                 .extra2         = &one_hundred,
 934         },
 935 #ifdef CONFIG_HUGETLB_PAGE
 936          {
 937                 .procname       = "nr_hugepages",
 938                 .data           = &max_huge_pages,
 939                 .maxlen         = sizeof(unsigned long),
 940                 .mode           = 0644,
 941                 .proc_handler   = &hugetlb_sysctl_handler,
 942                 .extra1         = (void *)&hugetlb_zero,
 943                 .extra2         = (void *)&hugetlb_infinity,
 944          },
 945          {
 946                 .ctl_name       = VM_HUGETLB_GROUP,
 947                 .procname       = "hugetlb_shm_group",
 948                 .data           = &sysctl_hugetlb_shm_group,
 949                 .maxlen         = sizeof(gid_t),
 950                 .mode           = 0644,
 951                 .proc_handler   = &proc_dointvec,
 952          },
 953          {
 954                 .ctl_name       = CTL_UNNUMBERED,
 955                 .procname       = "hugepages_treat_as_movable",
 956                 .data           = &hugepages_treat_as_movable,
 957                 .maxlen         = sizeof(int),
 958                 .mode           = 0644,
 959                 .proc_handler   = &hugetlb_treat_movable_handler,
 960         },
 961         {
 962                 .ctl_name       = CTL_UNNUMBERED,
 963                 .procname       = "nr_overcommit_hugepages",
 964                 .data           = &sysctl_overcommit_huge_pages,
 965                 .maxlen         = sizeof(sysctl_overcommit_huge_pages),
 966                 .mode           = 0644,
 967                 .proc_handler   = &hugetlb_overcommit_handler,
 968         },
 969 #endif
 970         {
 971                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 972                 .procname       = "lowmem_reserve_ratio",
 973                 .data           = &sysctl_lowmem_reserve_ratio,
 974                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 975                 .mode           = 0644,
 976                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 977                 .strategy       = &sysctl_intvec,
 978         },
 979         {
 980                 .ctl_name       = VM_DROP_PAGECACHE,
 981                 .procname       = "drop_caches",
 982                 .data           = &sysctl_drop_caches,
 983                 .maxlen         = sizeof(int),
 984                 .mode           = 0644,
 985                 .proc_handler   = drop_caches_sysctl_handler,
 986                 .strategy       = &sysctl_intvec,
 987         },
 988         {
 989                 .ctl_name       = VM_MIN_FREE_KBYTES,
 990                 .procname       = "min_free_kbytes",
 991                 .data           = &min_free_kbytes,
 992                 .maxlen         = sizeof(min_free_kbytes),
 993                 .mode           = 0644,
 994                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 995                 .strategy       = &sysctl_intvec,
 996                 .extra1         = &zero,
 997         },
 998         {
 999                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1000                 .procname       = "percpu_pagelist_fraction",
1001                 .data           = &percpu_pagelist_fraction,
1002                 .maxlen         = sizeof(percpu_pagelist_fraction),
1003                 .mode           = 0644,
1004                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1005                 .strategy       = &sysctl_intvec,
1006                 .extra1         = &min_percpu_pagelist_fract,
1007         },
1008 #ifdef CONFIG_MMU
1009         {
1010                 .ctl_name       = VM_MAX_MAP_COUNT,
1011                 .procname       = "max_map_count",
1012                 .data           = &sysctl_max_map_count,
1013                 .maxlen         = sizeof(sysctl_max_map_count),
1014                 .mode           = 0644,
1015                 .proc_handler   = &proc_dointvec
1016         },
1017 #endif
1018         {
1019                 .ctl_name       = VM_LAPTOP_MODE,
1020                 .procname       = "laptop_mode",
1021                 .data           = &laptop_mode,
1022                 .maxlen         = sizeof(laptop_mode),
1023                 .mode           = 0644,
1024                 .proc_handler   = &proc_dointvec_jiffies,
1025                 .strategy       = &sysctl_jiffies,
1026         },
1027         {
1028                 .ctl_name       = VM_BLOCK_DUMP,
1029                 .procname       = "block_dump",
1030                 .data           = &block_dump,
1031                 .maxlen         = sizeof(block_dump),
1032                 .mode           = 0644,
1033                 .proc_handler   = &proc_dointvec,
1034                 .strategy       = &sysctl_intvec,
1035                 .extra1         = &zero,
1036         },
1037         {
1038                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1039                 .procname       = "vfs_cache_pressure",
1040                 .data           = &sysctl_vfs_cache_pressure,
1041                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1042                 .mode           = 0644,
1043                 .proc_handler   = &proc_dointvec,
1044                 .strategy       = &sysctl_intvec,
1045                 .extra1         = &zero,
1046         },
1047 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1048         {
1049                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1050                 .procname       = "legacy_va_layout",
1051                 .data           = &sysctl_legacy_va_layout,
1052                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1053                 .mode           = 0644,
1054                 .proc_handler   = &proc_dointvec,
1055                 .strategy       = &sysctl_intvec,
1056                 .extra1         = &zero,
1057         },
1058 #endif
1059 #ifdef CONFIG_NUMA
1060         {
1061                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1062                 .procname       = "zone_reclaim_mode",
1063                 .data           = &zone_reclaim_mode,
1064                 .maxlen         = sizeof(zone_reclaim_mode),
1065                 .mode           = 0644,
1066                 .proc_handler   = &proc_dointvec,
1067                 .strategy       = &sysctl_intvec,
1068                 .extra1         = &zero,
1069         },
1070         {
1071                 .ctl_name       = VM_MIN_UNMAPPED,
1072                 .procname       = "min_unmapped_ratio",
1073                 .data           = &sysctl_min_unmapped_ratio,
1074                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1075                 .mode           = 0644,
1076                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1077                 .strategy       = &sysctl_intvec,
1078                 .extra1         = &zero,
1079                 .extra2         = &one_hundred,
1080         },
1081         {
1082                 .ctl_name       = VM_MIN_SLAB,
1083                 .procname       = "min_slab_ratio",
1084                 .data           = &sysctl_min_slab_ratio,
1085                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1086                 .mode           = 0644,
1087                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1088                 .strategy       = &sysctl_intvec,
1089                 .extra1         = &zero,
1090                 .extra2         = &one_hundred,
1091         },
1092 #endif
1093 #ifdef CONFIG_SMP
1094         {
1095                 .ctl_name       = CTL_UNNUMBERED,
1096                 .procname       = "stat_interval",
1097                 .data           = &sysctl_stat_interval,
1098                 .maxlen         = sizeof(sysctl_stat_interval),
1099                 .mode           = 0644,
1100                 .proc_handler   = &proc_dointvec_jiffies,
1101                 .strategy       = &sysctl_jiffies,
1102         },
1103 #endif
1104 #ifdef CONFIG_SECURITY
1105         {
1106                 .ctl_name       = CTL_UNNUMBERED,
1107                 .procname       = "mmap_min_addr",
1108                 .data           = &mmap_min_addr,
1109                 .maxlen         = sizeof(unsigned long),
1110                 .mode           = 0644,
1111                 .proc_handler   = &proc_doulongvec_minmax,
1112         },
1113 #endif
1114 #ifdef CONFIG_NUMA
1115         {
1116                 .ctl_name       = CTL_UNNUMBERED,
1117                 .procname       = "numa_zonelist_order",
1118                 .data           = &numa_zonelist_order,
1119                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1120                 .mode           = 0644,
1121                 .proc_handler   = &numa_zonelist_order_handler,
1122                 .strategy       = &sysctl_string,
1123         },
1124 #endif
1125 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1126    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1127         {
1128                 .ctl_name       = VM_VDSO_ENABLED,
1129                 .procname       = "vdso_enabled",
1130                 .data           = &vdso_enabled,
1131                 .maxlen         = sizeof(vdso_enabled),
1132                 .mode           = 0644,
1133                 .proc_handler   = &proc_dointvec,
1134                 .strategy       = &sysctl_intvec,
1135                 .extra1         = &zero,
1136         },
1137 #endif
1138 #ifdef CONFIG_HIGHMEM
1139         {
1140                 .ctl_name       = CTL_UNNUMBERED,
1141                 .procname       = "highmem_is_dirtyable",
1142                 .data           = &vm_highmem_is_dirtyable,
1143                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1144                 .mode           = 0644,
1145                 .proc_handler   = &proc_dointvec_minmax,
1146                 .strategy       = &sysctl_intvec,
1147                 .extra1         = &zero,
1148                 .extra2         = &one,
1149         },
1150 #endif
1151 /*
1152  * NOTE: do not add new entries to this table unless you have read
1153  * Documentation/sysctl/ctl_unnumbered.txt
1154  */
1155         { .ctl_name = 0 }
1156 };
1157
1158 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1159 static struct ctl_table binfmt_misc_table[] = {
1160         { .ctl_name = 0 }
1161 };
1162 #endif
1163
1164 static struct ctl_table fs_table[] = {
1165         {
1166                 .ctl_name       = FS_NRINODE,
1167                 .procname       = "inode-nr",
1168                 .data           = &inodes_stat,
1169                 .maxlen         = 2*sizeof(int),
1170                 .mode           = 0444,
1171                 .proc_handler   = &proc_dointvec,
1172         },
1173         {
1174                 .ctl_name       = FS_STATINODE,
1175                 .procname       = "inode-state",
1176                 .data           = &inodes_stat,
1177                 .maxlen         = 7*sizeof(int),
1178                 .mode           = 0444,
1179                 .proc_handler   = &proc_dointvec,
1180         },
1181         {
1182                 .procname       = "file-nr",
1183                 .data           = &files_stat,
1184                 .maxlen         = 3*sizeof(int),
1185                 .mode           = 0444,
1186                 .proc_handler   = &proc_nr_files,
1187         },
1188         {
1189                 .ctl_name       = FS_MAXFILE,
1190                 .procname       = "file-max",
1191                 .data           = &files_stat.max_files,
1192                 .maxlen         = sizeof(int),
1193                 .mode           = 0644,
1194                 .proc_handler   = &proc_dointvec,
1195         },
1196         {
1197                 .ctl_name       = CTL_UNNUMBERED,
1198                 .procname       = "nr_open",
1199                 .data           = &sysctl_nr_open,
1200                 .maxlen         = sizeof(int),
1201                 .mode           = 0644,
1202                 .proc_handler   = &proc_dointvec_minmax,
1203                 .extra1         = &sysctl_nr_open_min,
1204                 .extra2         = &sysctl_nr_open_max,
1205         },
1206         {
1207                 .ctl_name       = FS_DENTRY,
1208                 .procname       = "dentry-state",
1209                 .data           = &dentry_stat,
1210                 .maxlen         = 6*sizeof(int),
1211                 .mode           = 0444,
1212                 .proc_handler   = &proc_dointvec,
1213         },
1214         {
1215                 .ctl_name       = FS_OVERFLOWUID,
1216                 .procname       = "overflowuid",
1217                 .data           = &fs_overflowuid,
1218                 .maxlen         = sizeof(int),
1219                 .mode           = 0644,
1220                 .proc_handler   = &proc_dointvec_minmax,
1221                 .strategy       = &sysctl_intvec,
1222                 .extra1         = &minolduid,
1223                 .extra2         = &maxolduid,
1224         },
1225         {
1226                 .ctl_name       = FS_OVERFLOWGID,
1227                 .procname       = "overflowgid",
1228                 .data           = &fs_overflowgid,
1229                 .maxlen         = sizeof(int),
1230                 .mode           = 0644,
1231                 .proc_handler   = &proc_dointvec_minmax,
1232                 .strategy       = &sysctl_intvec,
1233                 .extra1         = &minolduid,
1234                 .extra2         = &maxolduid,
1235         },
1236         {
1237                 .ctl_name       = FS_LEASES,
1238                 .procname       = "leases-enable",
1239                 .data           = &leases_enable,
1240                 .maxlen         = sizeof(int),
1241                 .mode           = 0644,
1242                 .proc_handler   = &proc_dointvec,
1243         },
1244 #ifdef CONFIG_DNOTIFY
1245         {
1246                 .ctl_name       = FS_DIR_NOTIFY,
1247                 .procname       = "dir-notify-enable",
1248                 .data           = &dir_notify_enable,
1249                 .maxlen         = sizeof(int),
1250                 .mode           = 0644,
1251                 .proc_handler   = &proc_dointvec,
1252         },
1253 #endif
1254 #ifdef CONFIG_MMU
1255         {
1256                 .ctl_name       = FS_LEASE_TIME,
1257                 .procname       = "lease-break-time",
1258                 .data           = &lease_break_time,
1259                 .maxlen         = sizeof(int),
1260                 .mode           = 0644,
1261                 .proc_handler   = &proc_dointvec_minmax,
1262                 .strategy       = &sysctl_intvec,
1263                 .extra1         = &zero,
1264                 .extra2         = &two,
1265         },
1266         {
1267                 .procname       = "aio-nr",
1268                 .data           = &aio_nr,
1269                 .maxlen         = sizeof(aio_nr),
1270                 .mode           = 0444,
1271                 .proc_handler   = &proc_doulongvec_minmax,
1272         },
1273         {
1274                 .procname       = "aio-max-nr",
1275                 .data           = &aio_max_nr,
1276                 .maxlen         = sizeof(aio_max_nr),
1277                 .mode           = 0644,
1278                 .proc_handler   = &proc_doulongvec_minmax,
1279         },
1280 #ifdef CONFIG_INOTIFY_USER
1281         {
1282                 .ctl_name       = FS_INOTIFY,
1283                 .procname       = "inotify",
1284                 .mode           = 0555,
1285                 .child          = inotify_table,
1286         },
1287 #endif
1288 #endif
1289         {
1290                 .ctl_name       = KERN_SETUID_DUMPABLE,
1291                 .procname       = "suid_dumpable",
1292                 .data           = &suid_dumpable,
1293                 .maxlen         = sizeof(int),
1294                 .mode           = 0644,
1295                 .proc_handler   = &proc_dointvec,
1296         },
1297 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1298         {
1299                 .ctl_name       = CTL_UNNUMBERED,
1300                 .procname       = "binfmt_misc",
1301                 .mode           = 0555,
1302                 .child          = binfmt_misc_table,
1303         },
1304 #endif
1305 /*
1306  * NOTE: do not add new entries to this table unless you have read
1307  * Documentation/sysctl/ctl_unnumbered.txt
1308  */
1309         { .ctl_name = 0 }
1310 };
1311
1312 static struct ctl_table debug_table[] = {
1313 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1314         {
1315                 .ctl_name       = CTL_UNNUMBERED,
1316                 .procname       = "exception-trace",
1317                 .data           = &show_unhandled_signals,
1318                 .maxlen         = sizeof(int),
1319                 .mode           = 0644,
1320                 .proc_handler   = proc_dointvec
1321         },
1322 #endif
1323         { .ctl_name = 0 }
1324 };
1325
1326 static struct ctl_table dev_table[] = {
1327         { .ctl_name = 0 }
1328 };
1329
1330 static DEFINE_SPINLOCK(sysctl_lock);
1331
1332 /* called under sysctl_lock */
1333 static int use_table(struct ctl_table_header *p)
1334 {
1335         if (unlikely(p->unregistering))
1336                 return 0;
1337         p->used++;
1338         return 1;
1339 }
1340
1341 /* called under sysctl_lock */
1342 static void unuse_table(struct ctl_table_header *p)
1343 {
1344         if (!--p->used)
1345                 if (unlikely(p->unregistering))
1346                         complete(p->unregistering);
1347 }
1348
1349 /* called under sysctl_lock, will reacquire if has to wait */
1350 static void start_unregistering(struct ctl_table_header *p)
1351 {
1352         /*
1353          * if p->used is 0, nobody will ever touch that entry again;
1354          * we'll eliminate all paths to it before dropping sysctl_lock
1355          */
1356         if (unlikely(p->used)) {
1357                 struct completion wait;
1358                 init_completion(&wait);
1359                 p->unregistering = &wait;
1360                 spin_unlock(&sysctl_lock);
1361                 wait_for_completion(&wait);
1362                 spin_lock(&sysctl_lock);
1363         }
1364         /*
1365          * do not remove from the list until nobody holds it; walking the
1366          * list in do_sysctl() relies on that.
1367          */
1368         list_del_init(&p->ctl_entry);
1369 }
1370
1371 void sysctl_head_finish(struct ctl_table_header *head)
1372 {
1373         if (!head)
1374                 return;
1375         spin_lock(&sysctl_lock);
1376         unuse_table(head);
1377         spin_unlock(&sysctl_lock);
1378 }
1379
1380 static struct list_head *
1381 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1382 {
1383         struct list_head *header_list;
1384         header_list = &root->header_list;
1385         if (root->lookup)
1386                 header_list = root->lookup(root, namespaces);
1387         return header_list;
1388 }
1389
1390 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1391                                             struct ctl_table_header *prev)
1392 {
1393         struct ctl_table_root *root;
1394         struct list_head *header_list;
1395         struct ctl_table_header *head;
1396         struct list_head *tmp;
1397
1398         spin_lock(&sysctl_lock);
1399         if (prev) {
1400                 head = prev;
1401                 tmp = &prev->ctl_entry;
1402                 unuse_table(prev);
1403                 goto next;
1404         }
1405         tmp = &root_table_header.ctl_entry;
1406         for (;;) {
1407                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1408
1409                 if (!use_table(head))
1410                         goto next;
1411                 spin_unlock(&sysctl_lock);
1412                 return head;
1413         next:
1414                 root = head->root;
1415                 tmp = tmp->next;
1416                 header_list = lookup_header_list(root, namespaces);
1417                 if (tmp != header_list)
1418                         continue;
1419
1420                 do {
1421                         root = list_entry(root->root_list.next,
1422                                         struct ctl_table_root, root_list);
1423                         if (root == &sysctl_table_root)
1424                                 goto out;
1425                         header_list = lookup_header_list(root, namespaces);
1426                 } while (list_empty(header_list));
1427                 tmp = header_list->next;
1428         }
1429 out:
1430         spin_unlock(&sysctl_lock);
1431         return NULL;
1432 }
1433
1434 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1435 {
1436         return __sysctl_head_next(current->nsproxy, prev);
1437 }
1438
1439 void register_sysctl_root(struct ctl_table_root *root)
1440 {
1441         spin_lock(&sysctl_lock);
1442         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1443         spin_unlock(&sysctl_lock);
1444 }
1445
1446 #ifdef CONFIG_SYSCTL_SYSCALL
1447 /* Perform the actual read/write of a sysctl table entry. */
1448 static int do_sysctl_strategy(struct ctl_table_root *root,
1449                         struct ctl_table *table,
1450                         int __user *name, int nlen,
1451                         void __user *oldval, size_t __user *oldlenp,
1452                         void __user *newval, size_t newlen)
1453 {
1454         int op = 0, rc;
1455
1456         if (oldval)
1457                 op |= 004;
1458         if (newval)
1459                 op |= 002;
1460         if (sysctl_perm(root, table, op))
1461                 return -EPERM;
1462
1463         if (table->strategy) {
1464                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1465                                      newval, newlen);
1466                 if (rc < 0)
1467                         return rc;
1468                 if (rc > 0)
1469                         return 0;
1470         }
1471
1472         /* If there is no strategy routine, or if the strategy returns
1473          * zero, proceed with automatic r/w */
1474         if (table->data && table->maxlen) {
1475                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1476                                  newval, newlen);
1477                 if (rc < 0)
1478                         return rc;
1479         }
1480         return 0;
1481 }
1482
1483 static int parse_table(int __user *name, int nlen,
1484                        void __user *oldval, size_t __user *oldlenp,
1485                        void __user *newval, size_t newlen,
1486                        struct ctl_table_root *root,
1487                        struct ctl_table *table)
1488 {
1489         int n;
1490 repeat:
1491         if (!nlen)
1492                 return -ENOTDIR;
1493         if (get_user(n, name))
1494                 return -EFAULT;
1495         for ( ; table->ctl_name || table->procname; table++) {
1496                 if (!table->ctl_name)
1497                         continue;
1498                 if (n == table->ctl_name) {
1499                         int error;
1500                         if (table->child) {
1501                                 if (sysctl_perm(root, table, 001))
1502                                         return -EPERM;
1503                                 name++;
1504                                 nlen--;
1505                                 table = table->child;
1506                                 goto repeat;
1507                         }
1508                         error = do_sysctl_strategy(root, table, name, nlen,
1509                                                    oldval, oldlenp,
1510                                                    newval, newlen);
1511                         return error;
1512                 }
1513         }
1514         return -ENOTDIR;
1515 }
1516
1517 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1518                void __user *newval, size_t newlen)
1519 {
1520         struct ctl_table_header *head;
1521         int error = -ENOTDIR;
1522
1523         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1524                 return -ENOTDIR;
1525         if (oldval) {
1526                 int old_len;
1527                 if (!oldlenp || get_user(old_len, oldlenp))
1528                         return -EFAULT;
1529         }
1530
1531         for (head = sysctl_head_next(NULL); head;
1532                         head = sysctl_head_next(head)) {
1533                 error = parse_table(name, nlen, oldval, oldlenp,
1534                                         newval, newlen,
1535                                         head->root, head->ctl_table);
1536                 if (error != -ENOTDIR) {
1537                         sysctl_head_finish(head);
1538                         break;
1539                 }
1540         }
1541         return error;
1542 }
1543
1544 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1545 {
1546         struct __sysctl_args tmp;
1547         int error;
1548
1549         if (copy_from_user(&tmp, args, sizeof(tmp)))
1550                 return -EFAULT;
1551
1552         error = deprecated_sysctl_warning(&tmp);
1553         if (error)
1554                 goto out;
1555
1556         lock_kernel();
1557         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1558                           tmp.newval, tmp.newlen);
1559         unlock_kernel();
1560 out:
1561         return error;
1562 }
1563 #endif /* CONFIG_SYSCTL_SYSCALL */
1564
1565 /*
1566  * sysctl_perm does NOT grant the superuser all rights automatically, because
1567  * some sysctl variables are readonly even to root.
1568  */
1569
1570 static int test_perm(int mode, int op)
1571 {
1572         if (!current->euid)
1573                 mode >>= 6;
1574         else if (in_egroup_p(0))
1575                 mode >>= 3;
1576         if ((mode & op & 0007) == op)
1577                 return 0;
1578         return -EACCES;
1579 }
1580
1581 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1582 {
1583         int error;
1584         int mode;
1585
1586         error = security_sysctl(table, op);
1587         if (error)
1588                 return error;
1589
1590         if (root->permissions)
1591                 mode = root->permissions(root, current->nsproxy, table);
1592         else
1593                 mode = table->mode;
1594
1595         return test_perm(mode, op);
1596 }
1597
1598 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1599 {
1600         for (; table->ctl_name || table->procname; table++) {
1601                 table->parent = parent;
1602                 if (table->child)
1603                         sysctl_set_parent(table, table->child);
1604         }
1605 }
1606
1607 static __init int sysctl_init(void)
1608 {
1609         sysctl_set_parent(NULL, root_table);
1610 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1611         {
1612                 int err;
1613                 err = sysctl_check_table(current->nsproxy, root_table);
1614         }
1615 #endif
1616         return 0;
1617 }
1618
1619 core_initcall(sysctl_init);
1620
1621 /**
1622  * __register_sysctl_paths - register a sysctl hierarchy
1623  * @root: List of sysctl headers to register on
1624  * @namespaces: Data to compute which lists of sysctl entries are visible
1625  * @path: The path to the directory the sysctl table is in.
1626  * @table: the top-level table structure
1627  *
1628  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1629  * array. A completely 0 filled entry terminates the table.
1630  *
1631  * The members of the &struct ctl_table structure are used as follows:
1632  *
1633  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1634  *            must be unique within that level of sysctl
1635  *
1636  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1637  *            enter a sysctl file
1638  *
1639  * data - a pointer to data for use by proc_handler
1640  *
1641  * maxlen - the maximum size in bytes of the data
1642  *
1643  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1644  *
1645  * child - a pointer to the child sysctl table if this entry is a directory, or
1646  *         %NULL.
1647  *
1648  * proc_handler - the text handler routine (described below)
1649  *
1650  * strategy - the strategy routine (described below)
1651  *
1652  * de - for internal use by the sysctl routines
1653  *
1654  * extra1, extra2 - extra pointers usable by the proc handler routines
1655  *
1656  * Leaf nodes in the sysctl tree will be represented by a single file
1657  * under /proc; non-leaf nodes will be represented by directories.
1658  *
1659  * sysctl(2) can automatically manage read and write requests through
1660  * the sysctl table.  The data and maxlen fields of the ctl_table
1661  * struct enable minimal validation of the values being written to be
1662  * performed, and the mode field allows minimal authentication.
1663  *
1664  * More sophisticated management can be enabled by the provision of a
1665  * strategy routine with the table entry.  This will be called before
1666  * any automatic read or write of the data is performed.
1667  *
1668  * The strategy routine may return
1669  *
1670  * < 0 - Error occurred (error is passed to user process)
1671  *
1672  * 0   - OK - proceed with automatic read or write.
1673  *
1674  * > 0 - OK - read or write has been done by the strategy routine, so
1675  *       return immediately.
1676  *
1677  * There must be a proc_handler routine for any terminal nodes
1678  * mirrored under /proc/sys (non-terminals are handled by a built-in
1679  * directory handler).  Several default handlers are available to
1680  * cover common cases -
1681  *
1682  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1683  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1684  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1685  *
1686  * It is the handler's job to read the input buffer from user memory
1687  * and process it. The handler should return 0 on success.
1688  *
1689  * This routine returns %NULL on a failure to register, and a pointer
1690  * to the table header on success.
1691  */
1692 struct ctl_table_header *__register_sysctl_paths(
1693         struct ctl_table_root *root,
1694         struct nsproxy *namespaces,
1695         const struct ctl_path *path, struct ctl_table *table)
1696 {
1697         struct list_head *header_list;
1698         struct ctl_table_header *header;
1699         struct ctl_table *new, **prevp;
1700         unsigned int n, npath;
1701
1702         /* Count the path components */
1703         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1704                 ;
1705
1706         /*
1707          * For each path component, allocate a 2-element ctl_table array.
1708          * The first array element will be filled with the sysctl entry
1709          * for this, the second will be the sentinel (ctl_name == 0).
1710          *
1711          * We allocate everything in one go so that we don't have to
1712          * worry about freeing additional memory in unregister_sysctl_table.
1713          */
1714         header = kzalloc(sizeof(struct ctl_table_header) +
1715                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1716         if (!header)
1717                 return NULL;
1718
1719         new = (struct ctl_table *) (header + 1);
1720
1721         /* Now connect the dots */
1722         prevp = &header->ctl_table;
1723         for (n = 0; n < npath; ++n, ++path) {
1724                 /* Copy the procname */
1725                 new->procname = path->procname;
1726                 new->ctl_name = path->ctl_name;
1727                 new->mode     = 0555;
1728
1729                 *prevp = new;
1730                 prevp = &new->child;
1731
1732                 new += 2;
1733         }
1734         *prevp = table;
1735         header->ctl_table_arg = table;
1736
1737         INIT_LIST_HEAD(&header->ctl_entry);
1738         header->used = 0;
1739         header->unregistering = NULL;
1740         header->root = root;
1741         sysctl_set_parent(NULL, header->ctl_table);
1742 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1743         if (sysctl_check_table(namespaces, header->ctl_table)) {
1744                 kfree(header);
1745                 return NULL;
1746         }
1747 #endif
1748         spin_lock(&sysctl_lock);
1749         header_list = lookup_header_list(root, namespaces);
1750         list_add_tail(&header->ctl_entry, header_list);
1751         spin_unlock(&sysctl_lock);
1752
1753         return header;
1754 }
1755
1756 /**
1757  * register_sysctl_table_path - register a sysctl table hierarchy
1758  * @path: The path to the directory the sysctl table is in.
1759  * @table: the top-level table structure
1760  *
1761  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1762  * array. A completely 0 filled entry terminates the table.
1763  *
1764  * See __register_sysctl_paths for more details.
1765  */
1766 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1767                                                 struct ctl_table *table)
1768 {
1769         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1770                                         path, table);
1771 }
1772
1773 /**
1774  * register_sysctl_table - register a sysctl table hierarchy
1775  * @table: the top-level table structure
1776  *
1777  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1778  * array. A completely 0 filled entry terminates the table.
1779  *
1780  * See register_sysctl_paths for more details.
1781  */
1782 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1783 {
1784         static const struct ctl_path null_path[] = { {} };
1785
1786         return register_sysctl_paths(null_path, table);
1787 }
1788
1789 /**
1790  * unregister_sysctl_table - unregister a sysctl table hierarchy
1791  * @header: the header returned from register_sysctl_table
1792  *
1793  * Unregisters the sysctl table and all children. proc entries may not
1794  * actually be removed until they are no longer used by anyone.
1795  */
1796 void unregister_sysctl_table(struct ctl_table_header * header)
1797 {
1798         might_sleep();
1799
1800         if (header == NULL)
1801                 return;
1802
1803         spin_lock(&sysctl_lock);
1804         start_unregistering(header);
1805         spin_unlock(&sysctl_lock);
1806         kfree(header);
1807 }
1808
1809 #else /* !CONFIG_SYSCTL */
1810 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1811 {
1812         return NULL;
1813 }
1814
1815 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1816                                                     struct ctl_table *table)
1817 {
1818         return NULL;
1819 }
1820
1821 void unregister_sysctl_table(struct ctl_table_header * table)
1822 {
1823 }
1824
1825 #endif /* CONFIG_SYSCTL */
1826
1827 /*
1828  * /proc/sys support
1829  */
1830
1831 #ifdef CONFIG_PROC_SYSCTL
1832
1833 static int _proc_do_string(void* data, int maxlen, int write,
1834                            struct file *filp, void __user *buffer,
1835                            size_t *lenp, loff_t *ppos)
1836 {
1837         size_t len;
1838         char __user *p;
1839         char c;
1840
1841         if (!data || !maxlen || !*lenp) {
1842                 *lenp = 0;
1843                 return 0;
1844         }
1845
1846         if (write) {
1847                 len = 0;
1848                 p = buffer;
1849                 while (len < *lenp) {
1850                         if (get_user(c, p++))
1851                                 return -EFAULT;
1852                         if (c == 0 || c == '\n')
1853                                 break;
1854                         len++;
1855                 }
1856                 if (len >= maxlen)
1857                         len = maxlen-1;
1858                 if(copy_from_user(data, buffer, len))
1859                         return -EFAULT;
1860                 ((char *) data)[len] = 0;
1861                 *ppos += *lenp;
1862         } else {
1863                 len = strlen(data);
1864                 if (len > maxlen)
1865                         len = maxlen;
1866
1867                 if (*ppos > len) {
1868                         *lenp = 0;
1869                         return 0;
1870                 }
1871
1872                 data += *ppos;
1873                 len  -= *ppos;
1874
1875                 if (len > *lenp)
1876                         len = *lenp;
1877                 if (len)
1878                         if(copy_to_user(buffer, data, len))
1879                                 return -EFAULT;
1880                 if (len < *lenp) {
1881                         if(put_user('\n', ((char __user *) buffer) + len))
1882                                 return -EFAULT;
1883                         len++;
1884                 }
1885                 *lenp = len;
1886                 *ppos += len;
1887         }
1888         return 0;
1889 }
1890
1891 /**
1892  * proc_dostring - read a string sysctl
1893  * @table: the sysctl table
1894  * @write: %TRUE if this is a write to the sysctl file
1895  * @filp: the file structure
1896  * @buffer: the user buffer
1897  * @lenp: the size of the user buffer
1898  * @ppos: file position
1899  *
1900  * Reads/writes a string from/to the user buffer. If the kernel
1901  * buffer provided is not large enough to hold the string, the
1902  * string is truncated. The copied string is %NULL-terminated.
1903  * If the string is being read by the user process, it is copied
1904  * and a newline '\n' is added. It is truncated if the buffer is
1905  * not large enough.
1906  *
1907  * Returns 0 on success.
1908  */
1909 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1910                   void __user *buffer, size_t *lenp, loff_t *ppos)
1911 {
1912         return _proc_do_string(table->data, table->maxlen, write, filp,
1913                                buffer, lenp, ppos);
1914 }
1915
1916
1917 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1918                                  int *valp,
1919                                  int write, void *data)
1920 {
1921         if (write) {
1922                 *valp = *negp ? -*lvalp : *lvalp;
1923         } else {
1924                 int val = *valp;
1925                 if (val < 0) {
1926                         *negp = -1;
1927                         *lvalp = (unsigned long)-val;
1928                 } else {
1929                         *negp = 0;
1930                         *lvalp = (unsigned long)val;
1931                 }
1932         }
1933         return 0;
1934 }
1935
1936 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1937                   int write, struct file *filp, void __user *buffer,
1938                   size_t *lenp, loff_t *ppos,
1939                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1940                               int write, void *data),
1941                   void *data)
1942 {
1943 #define TMPBUFLEN 21
1944         int *i, vleft, first=1, neg, val;
1945         unsigned long lval;
1946         size_t left, len;
1947
1948         char buf[TMPBUFLEN], *p;
1949         char __user *s = buffer;
1950
1951         if (!tbl_data || !table->maxlen || !*lenp ||
1952             (*ppos && !write)) {
1953                 *lenp = 0;
1954                 return 0;
1955         }
1956
1957         i = (int *) tbl_data;
1958         vleft = table->maxlen / sizeof(*i);
1959         left = *lenp;
1960
1961         if (!conv)
1962                 conv = do_proc_dointvec_conv;
1963
1964         for (; left && vleft--; i++, first=0) {
1965                 if (write) {
1966                         while (left) {
1967                                 char c;
1968                                 if (get_user(c, s))
1969                                         return -EFAULT;
1970                                 if (!isspace(c))
1971                                         break;
1972                                 left--;
1973                                 s++;
1974                         }
1975                         if (!left)
1976                                 break;
1977                         neg = 0;
1978                         len = left;
1979                         if (len > sizeof(buf) - 1)
1980                                 len = sizeof(buf) - 1;
1981                         if (copy_from_user(buf, s, len))
1982                                 return -EFAULT;
1983                         buf[len] = 0;
1984                         p = buf;
1985                         if (*p == '-' && left > 1) {
1986                                 neg = 1;
1987                                 p++;
1988                         }
1989                         if (*p < '0' || *p > '9')
1990                                 break;
1991
1992                         lval = simple_strtoul(p, &p, 0);
1993
1994                         len = p-buf;
1995                         if ((len < left) && *p && !isspace(*p))
1996                                 break;
1997                         if (neg)
1998                                 val = -val;
1999                         s += len;
2000                         left -= len;
2001
2002                         if (conv(&neg, &lval, i, 1, data))
2003                                 break;
2004                 } else {
2005                         p = buf;
2006                         if (!first)
2007                                 *p++ = '\t';
2008
2009                         if (conv(&neg, &lval, i, 0, data))
2010                                 break;
2011
2012                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2013                         len = strlen(buf);
2014                         if (len > left)
2015                                 len = left;
2016                         if(copy_to_user(s, buf, len))
2017                                 return -EFAULT;
2018                         left -= len;
2019                         s += len;
2020                 }
2021         }
2022
2023         if (!write && !first && left) {
2024                 if(put_user('\n', s))
2025                         return -EFAULT;
2026                 left--, s++;
2027         }
2028         if (write) {
2029                 while (left) {
2030                         char c;
2031                         if (get_user(c, s++))
2032                                 return -EFAULT;
2033                         if (!isspace(c))
2034                                 break;
2035                         left--;
2036                 }
2037         }
2038         if (write && first)
2039                 return -EINVAL;
2040         *lenp -= left;
2041         *ppos += *lenp;
2042         return 0;
2043 #undef TMPBUFLEN
2044 }
2045
2046 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2047                   void __user *buffer, size_t *lenp, loff_t *ppos,
2048                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2049                               int write, void *data),
2050                   void *data)
2051 {
2052         return __do_proc_dointvec(table->data, table, write, filp,
2053                         buffer, lenp, ppos, conv, data);
2054 }
2055
2056 /**
2057  * proc_dointvec - read a vector of integers
2058  * @table: the sysctl table
2059  * @write: %TRUE if this is a write to the sysctl file
2060  * @filp: the file structure
2061  * @buffer: the user buffer
2062  * @lenp: the size of the user buffer
2063  * @ppos: file position
2064  *
2065  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2066  * values from/to the user buffer, treated as an ASCII string.
2067  *
2068  * Returns 0 on success.
2069  */
2070 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2071                      void __user *buffer, size_t *lenp, loff_t *ppos)
2072 {
2073     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2074                             NULL,NULL);
2075 }
2076
2077 #define OP_SET  0
2078 #define OP_AND  1
2079 #define OP_OR   2
2080
2081 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2082                                       int *valp,
2083                                       int write, void *data)
2084 {
2085         int op = *(int *)data;
2086         if (write) {
2087                 int val = *negp ? -*lvalp : *lvalp;
2088                 switch(op) {
2089                 case OP_SET:    *valp = val; break;
2090                 case OP_AND:    *valp &= val; break;
2091                 case OP_OR:     *valp |= val; break;
2092                 }
2093         } else {
2094                 int val = *valp;
2095                 if (val < 0) {
2096                         *negp = -1;
2097                         *lvalp = (unsigned long)-val;
2098                 } else {
2099                         *negp = 0;
2100                         *lvalp = (unsigned long)val;
2101                 }
2102         }
2103         return 0;
2104 }
2105
2106 /*
2107  *      Taint values can only be increased
2108  */
2109 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2110                                void __user *buffer, size_t *lenp, loff_t *ppos)
2111 {
2112         int op;
2113
2114         if (write && !capable(CAP_SYS_ADMIN))
2115                 return -EPERM;
2116
2117         op = OP_OR;
2118         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2119                                 do_proc_dointvec_bset_conv,&op);
2120 }
2121
2122 struct do_proc_dointvec_minmax_conv_param {
2123         int *min;
2124         int *max;
2125 };
2126
2127 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2128                                         int *valp,
2129                                         int write, void *data)
2130 {
2131         struct do_proc_dointvec_minmax_conv_param *param = data;
2132         if (write) {
2133                 int val = *negp ? -*lvalp : *lvalp;
2134                 if ((param->min && *param->min > val) ||
2135                     (param->max && *param->max < val))
2136                         return -EINVAL;
2137                 *valp = val;
2138         } else {
2139                 int val = *valp;
2140                 if (val < 0) {
2141                         *negp = -1;
2142                         *lvalp = (unsigned long)-val;
2143                 } else {
2144                         *negp = 0;
2145                         *lvalp = (unsigned long)val;
2146                 }
2147         }
2148         return 0;
2149 }
2150
2151 /**
2152  * proc_dointvec_minmax - read a vector of integers with min/max values
2153  * @table: the sysctl table
2154  * @write: %TRUE if this is a write to the sysctl file
2155  * @filp: the file structure
2156  * @buffer: the user buffer
2157  * @lenp: the size of the user buffer
2158  * @ppos: file position
2159  *
2160  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2161  * values from/to the user buffer, treated as an ASCII string.
2162  *
2163  * This routine will ensure the values are within the range specified by
2164  * table->extra1 (min) and table->extra2 (max).
2165  *
2166  * Returns 0 on success.
2167  */
2168 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2169                   void __user *buffer, size_t *lenp, loff_t *ppos)
2170 {
2171         struct do_proc_dointvec_minmax_conv_param param = {
2172                 .min = (int *) table->extra1,
2173                 .max = (int *) table->extra2,
2174         };
2175         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2176                                 do_proc_dointvec_minmax_conv, &param);
2177 }
2178
2179 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2180                                      struct file *filp,
2181                                      void __user *buffer,
2182                                      size_t *lenp, loff_t *ppos,
2183                                      unsigned long convmul,
2184                                      unsigned long convdiv)
2185 {
2186 #define TMPBUFLEN 21
2187         unsigned long *i, *min, *max, val;
2188         int vleft, first=1, neg;
2189         size_t len, left;
2190         char buf[TMPBUFLEN], *p;
2191         char __user *s = buffer;
2192
2193         if (!data || !table->maxlen || !*lenp ||
2194             (*ppos && !write)) {
2195                 *lenp = 0;
2196                 return 0;
2197         }
2198
2199         i = (unsigned long *) data;
2200         min = (unsigned long *) table->extra1;
2201         max = (unsigned long *) table->extra2;
2202         vleft = table->maxlen / sizeof(unsigned long);
2203         left = *lenp;
2204
2205         for (; left && vleft--; i++, min++, max++, first=0) {
2206                 if (write) {
2207                         while (left) {
2208                                 char c;
2209                                 if (get_user(c, s))
2210                                         return -EFAULT;
2211                                 if (!isspace(c))
2212                                         break;
2213                                 left--;
2214                                 s++;
2215                         }
2216                         if (!left)
2217                                 break;
2218                         neg = 0;
2219                         len = left;
2220                         if (len > TMPBUFLEN-1)
2221                                 len = TMPBUFLEN-1;
2222                         if (copy_from_user(buf, s, len))
2223                                 return -EFAULT;
2224                         buf[len] = 0;
2225                         p = buf;
2226                         if (*p == '-' && left > 1) {
2227                                 neg = 1;
2228                                 p++;
2229                         }
2230                         if (*p < '0' || *p > '9')
2231                                 break;
2232                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2233                         len = p-buf;
2234                         if ((len < left) && *p && !isspace(*p))
2235                                 break;
2236                         if (neg)
2237                                 val = -val;
2238                         s += len;
2239                         left -= len;
2240
2241                         if(neg)
2242                                 continue;
2243                         if ((min && val < *min) || (max && val > *max))
2244                                 continue;
2245                         *i = val;
2246                 } else {
2247                         p = buf;
2248                         if (!first)
2249                                 *p++ = '\t';
2250                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2251                         len = strlen(buf);
2252                         if (len > left)
2253                                 len = left;
2254                         if(copy_to_user(s, buf, len))
2255                                 return -EFAULT;
2256                         left -= len;
2257                         s += len;
2258                 }
2259         }
2260
2261         if (!write && !first && left) {
2262                 if(put_user('\n', s))
2263                         return -EFAULT;
2264                 left--, s++;
2265         }
2266         if (write) {
2267                 while (left) {
2268                         char c;
2269                         if (get_user(c, s++))
2270                                 return -EFAULT;
2271                         if (!isspace(c))
2272                                 break;
2273                         left--;
2274                 }
2275         }
2276         if (write && first)
2277                 return -EINVAL;
2278         *lenp -= left;
2279         *ppos += *lenp;
2280         return 0;
2281 #undef TMPBUFLEN
2282 }
2283
2284 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2285                                      struct file *filp,
2286                                      void __user *buffer,
2287                                      size_t *lenp, loff_t *ppos,
2288                                      unsigned long convmul,
2289                                      unsigned long convdiv)
2290 {
2291         return __do_proc_doulongvec_minmax(table->data, table, write,
2292                         filp, buffer, lenp, ppos, convmul, convdiv);
2293 }
2294
2295 /**
2296  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2297  * @table: the sysctl table
2298  * @write: %TRUE if this is a write to the sysctl file
2299  * @filp: the file structure
2300  * @buffer: the user buffer
2301  * @lenp: the size of the user buffer
2302  * @ppos: file position
2303  *
2304  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2305  * values from/to the user buffer, treated as an ASCII string.
2306  *
2307  * This routine will ensure the values are within the range specified by
2308  * table->extra1 (min) and table->extra2 (max).
2309  *
2310  * Returns 0 on success.
2311  */
2312 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2313                            void __user *buffer, size_t *lenp, loff_t *ppos)
2314 {
2315     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2316 }
2317
2318 /**
2319  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2320  * @table: the sysctl table
2321  * @write: %TRUE if this is a write to the sysctl file
2322  * @filp: the file structure
2323  * @buffer: the user buffer
2324  * @lenp: the size of the user buffer
2325  * @ppos: file position
2326  *
2327  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2328  * values from/to the user buffer, treated as an ASCII string. The values
2329  * are treated as milliseconds, and converted to jiffies when they are stored.
2330  *
2331  * This routine will ensure the values are within the range specified by
2332  * table->extra1 (min) and table->extra2 (max).
2333  *
2334  * Returns 0 on success.
2335  */
2336 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2337                                       struct file *filp,
2338                                       void __user *buffer,
2339                                       size_t *lenp, loff_t *ppos)
2340 {
2341     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2342                                      lenp, ppos, HZ, 1000l);
2343 }
2344
2345
2346 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2347                                          int *valp,
2348                                          int write, void *data)
2349 {
2350         if (write) {
2351                 if (*lvalp > LONG_MAX / HZ)
2352                         return 1;
2353                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2354         } else {
2355                 int val = *valp;
2356                 unsigned long lval;
2357                 if (val < 0) {
2358                         *negp = -1;
2359                         lval = (unsigned long)-val;
2360                 } else {
2361                         *negp = 0;
2362                         lval = (unsigned long)val;
2363                 }
2364                 *lvalp = lval / HZ;
2365         }
2366         return 0;
2367 }
2368
2369 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2370                                                 int *valp,
2371                                                 int write, void *data)
2372 {
2373         if (write) {
2374                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2375                         return 1;
2376                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2377         } else {
2378                 int val = *valp;
2379                 unsigned long lval;
2380                 if (val < 0) {
2381                         *negp = -1;
2382                         lval = (unsigned long)-val;
2383                 } else {
2384                         *negp = 0;
2385                         lval = (unsigned long)val;
2386                 }
2387                 *lvalp = jiffies_to_clock_t(lval);
2388         }
2389         return 0;
2390 }
2391
2392 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2393                                             int *valp,
2394                                             int write, void *data)
2395 {
2396         if (write) {
2397                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2398         } else {
2399                 int val = *valp;
2400                 unsigned long lval;
2401                 if (val < 0) {
2402                         *negp = -1;
2403                         lval = (unsigned long)-val;
2404                 } else {
2405                         *negp = 0;
2406                         lval = (unsigned long)val;
2407                 }
2408                 *lvalp = jiffies_to_msecs(lval);
2409         }
2410         return 0;
2411 }
2412
2413 /**
2414  * proc_dointvec_jiffies - read a vector of integers as seconds
2415  * @table: the sysctl table
2416  * @write: %TRUE if this is a write to the sysctl file
2417  * @filp: the file structure
2418  * @buffer: the user buffer
2419  * @lenp: the size of the user buffer
2420  * @ppos: file position
2421  *
2422  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2423  * values from/to the user buffer, treated as an ASCII string.
2424  * The values read are assumed to be in seconds, and are converted into
2425  * jiffies.
2426  *
2427  * Returns 0 on success.
2428  */
2429 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2430                           void __user *buffer, size_t *lenp, loff_t *ppos)
2431 {
2432     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2433                             do_proc_dointvec_jiffies_conv,NULL);
2434 }
2435
2436 /**
2437  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2438  * @table: the sysctl table
2439  * @write: %TRUE if this is a write to the sysctl file
2440  * @filp: the file structure
2441  * @buffer: the user buffer
2442  * @lenp: the size of the user buffer
2443  * @ppos: pointer to the file position
2444  *
2445  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2446  * values from/to the user buffer, treated as an ASCII string.
2447  * The values read are assumed to be in 1/USER_HZ seconds, and
2448  * are converted into jiffies.
2449  *
2450  * Returns 0 on success.
2451  */
2452 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2453                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2454 {
2455     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2456                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2457 }
2458
2459 /**
2460  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2461  * @table: the sysctl table
2462  * @write: %TRUE if this is a write to the sysctl file
2463  * @filp: the file structure
2464  * @buffer: the user buffer
2465  * @lenp: the size of the user buffer
2466  * @ppos: file position
2467  * @ppos: the current position in the file
2468  *
2469  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2470  * values from/to the user buffer, treated as an ASCII string.
2471  * The values read are assumed to be in 1/1000 seconds, and
2472  * are converted into jiffies.
2473  *
2474  * Returns 0 on success.
2475  */
2476 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2477                              void __user *buffer, size_t *lenp, loff_t *ppos)
2478 {
2479         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2480                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2481 }
2482
2483 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2484                            void __user *buffer, size_t *lenp, loff_t *ppos)
2485 {
2486         struct pid *new_pid;
2487         pid_t tmp;
2488         int r;
2489
2490         tmp = pid_vnr(cad_pid);
2491
2492         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2493                                lenp, ppos, NULL, NULL);
2494         if (r || !write)
2495                 return r;
2496
2497         new_pid = find_get_pid(tmp);
2498         if (!new_pid)
2499                 return -ESRCH;
2500
2501         put_pid(xchg(&cad_pid, new_pid));
2502         return 0;
2503 }
2504
2505 #else /* CONFIG_PROC_FS */
2506
2507 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2508                   void __user *buffer, size_t *lenp, loff_t *ppos)
2509 {
2510         return -ENOSYS;
2511 }
2512
2513 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2514                   void __user *buffer, size_t *lenp, loff_t *ppos)
2515 {
2516         return -ENOSYS;
2517 }
2518
2519 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2520                     void __user *buffer, size_t *lenp, loff_t *ppos)
2521 {
2522         return -ENOSYS;
2523 }
2524
2525 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2526                     void __user *buffer, size_t *lenp, loff_t *ppos)
2527 {
2528         return -ENOSYS;
2529 }
2530
2531 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2532                     void __user *buffer, size_t *lenp, loff_t *ppos)
2533 {
2534         return -ENOSYS;
2535 }
2536
2537 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2538                              void __user *buffer, size_t *lenp, loff_t *ppos)
2539 {
2540         return -ENOSYS;
2541 }
2542
2543 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2544                     void __user *buffer, size_t *lenp, loff_t *ppos)
2545 {
2546         return -ENOSYS;
2547 }
2548
2549 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2550                                       struct file *filp,
2551                                       void __user *buffer,
2552                                       size_t *lenp, loff_t *ppos)
2553 {
2554     return -ENOSYS;
2555 }
2556
2557
2558 #endif /* CONFIG_PROC_FS */
2559
2560
2561 #ifdef CONFIG_SYSCTL_SYSCALL
2562 /*
2563  * General sysctl support routines
2564  */
2565
2566 /* The generic sysctl data routine (used if no strategy routine supplied) */
2567 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2568                 void __user *oldval, size_t __user *oldlenp,
2569                 void __user *newval, size_t newlen)
2570 {
2571         size_t len;
2572
2573         /* Get out of I don't have a variable */
2574         if (!table->data || !table->maxlen)
2575                 return -ENOTDIR;
2576
2577         if (oldval && oldlenp) {
2578                 if (get_user(len, oldlenp))
2579                         return -EFAULT;
2580                 if (len) {
2581                         if (len > table->maxlen)
2582                                 len = table->maxlen;
2583                         if (copy_to_user(oldval, table->data, len))
2584                                 return -EFAULT;
2585                         if (put_user(len, oldlenp))
2586                                 return -EFAULT;
2587                 }
2588         }
2589
2590         if (newval && newlen) {
2591                 if (newlen > table->maxlen)
2592                         newlen = table->maxlen;
2593
2594                 if (copy_from_user(table->data, newval, newlen))
2595                         return -EFAULT;
2596         }
2597         return 1;
2598 }
2599
2600 /* The generic string strategy routine: */
2601 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2602                   void __user *oldval, size_t __user *oldlenp,
2603                   void __user *newval, size_t newlen)
2604 {
2605         if (!table->data || !table->maxlen)
2606                 return -ENOTDIR;
2607
2608         if (oldval && oldlenp) {
2609                 size_t bufsize;
2610                 if (get_user(bufsize, oldlenp))
2611                         return -EFAULT;
2612                 if (bufsize) {
2613                         size_t len = strlen(table->data), copied;
2614
2615                         /* This shouldn't trigger for a well-formed sysctl */
2616                         if (len > table->maxlen)
2617                                 len = table->maxlen;
2618
2619                         /* Copy up to a max of bufsize-1 bytes of the string */
2620                         copied = (len >= bufsize) ? bufsize - 1 : len;
2621
2622                         if (copy_to_user(oldval, table->data, copied) ||
2623                             put_user(0, (char __user *)(oldval + copied)))
2624                                 return -EFAULT;
2625                         if (put_user(len, oldlenp))
2626                                 return -EFAULT;
2627                 }
2628         }
2629         if (newval && newlen) {
2630                 size_t len = newlen;
2631                 if (len > table->maxlen)
2632                         len = table->maxlen;
2633                 if(copy_from_user(table->data, newval, len))
2634                         return -EFAULT;
2635                 if (len == table->maxlen)
2636                         len--;
2637                 ((char *) table->data)[len] = 0;
2638         }
2639         return 1;
2640 }
2641
2642 /*
2643  * This function makes sure that all of the integers in the vector
2644  * are between the minimum and maximum values given in the arrays
2645  * table->extra1 and table->extra2, respectively.
2646  */
2647 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2648                 void __user *oldval, size_t __user *oldlenp,
2649                 void __user *newval, size_t newlen)
2650 {
2651
2652         if (newval && newlen) {
2653                 int __user *vec = (int __user *) newval;
2654                 int *min = (int *) table->extra1;
2655                 int *max = (int *) table->extra2;
2656                 size_t length;
2657                 int i;
2658
2659                 if (newlen % sizeof(int) != 0)
2660                         return -EINVAL;
2661
2662                 if (!table->extra1 && !table->extra2)
2663                         return 0;
2664
2665                 if (newlen > table->maxlen)
2666                         newlen = table->maxlen;
2667                 length = newlen / sizeof(int);
2668
2669                 for (i = 0; i < length; i++) {
2670                         int value;
2671                         if (get_user(value, vec + i))
2672                                 return -EFAULT;
2673                         if (min && value < min[i])
2674                                 return -EINVAL;
2675                         if (max && value > max[i])
2676                                 return -EINVAL;
2677                 }
2678         }
2679         return 0;
2680 }
2681
2682 /* Strategy function to convert jiffies to seconds */
2683 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2684                 void __user *oldval, size_t __user *oldlenp,
2685                 void __user *newval, size_t newlen)
2686 {
2687         if (oldval && oldlenp) {
2688                 size_t olen;
2689
2690                 if (get_user(olen, oldlenp))
2691                         return -EFAULT;
2692                 if (olen) {
2693                         int val;
2694
2695                         if (olen < sizeof(int))
2696                                 return -EINVAL;
2697
2698                         val = *(int *)(table->data) / HZ;
2699                         if (put_user(val, (int __user *)oldval))
2700                                 return -EFAULT;
2701                         if (put_user(sizeof(int), oldlenp))
2702                                 return -EFAULT;
2703                 }
2704         }
2705         if (newval && newlen) {
2706                 int new;
2707                 if (newlen != sizeof(int))
2708                         return -EINVAL;
2709                 if (get_user(new, (int __user *)newval))
2710                         return -EFAULT;
2711                 *(int *)(table->data) = new*HZ;
2712         }
2713         return 1;
2714 }
2715
2716 /* Strategy function to convert jiffies to seconds */
2717 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2718                 void __user *oldval, size_t __user *oldlenp,
2719                 void __user *newval, size_t newlen)
2720 {
2721         if (oldval && oldlenp) {
2722                 size_t olen;
2723
2724                 if (get_user(olen, oldlenp))
2725                         return -EFAULT;
2726                 if (olen) {
2727                         int val;
2728
2729                         if (olen < sizeof(int))
2730                                 return -EINVAL;
2731
2732                         val = jiffies_to_msecs(*(int *)(table->data));
2733                         if (put_user(val, (int __user *)oldval))
2734                                 return -EFAULT;
2735                         if (put_user(sizeof(int), oldlenp))
2736                                 return -EFAULT;
2737                 }
2738         }
2739         if (newval && newlen) {
2740                 int new;
2741                 if (newlen != sizeof(int))
2742                         return -EINVAL;
2743                 if (get_user(new, (int __user *)newval))
2744                         return -EFAULT;
2745                 *(int *)(table->data) = msecs_to_jiffies(new);
2746         }
2747         return 1;
2748 }
2749
2750
2751
2752 #else /* CONFIG_SYSCTL_SYSCALL */
2753
2754
2755 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2756 {
2757         struct __sysctl_args tmp;
2758         int error;
2759
2760         if (copy_from_user(&tmp, args, sizeof(tmp)))
2761                 return -EFAULT;
2762
2763         error = deprecated_sysctl_warning(&tmp);
2764
2765         /* If no error reading the parameters then just -ENOSYS ... */
2766         if (!error)
2767                 error = -ENOSYS;
2768
2769         return error;
2770 }
2771
2772 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2773                   void __user *oldval, size_t __user *oldlenp,
2774                   void __user *newval, size_t newlen)
2775 {
2776         return -ENOSYS;
2777 }
2778
2779 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2780                   void __user *oldval, size_t __user *oldlenp,
2781                   void __user *newval, size_t newlen)
2782 {
2783         return -ENOSYS;
2784 }
2785
2786 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2787                 void __user *oldval, size_t __user *oldlenp,
2788                 void __user *newval, size_t newlen)
2789 {
2790         return -ENOSYS;
2791 }
2792
2793 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2794                 void __user *oldval, size_t __user *oldlenp,
2795                 void __user *newval, size_t newlen)
2796 {
2797         return -ENOSYS;
2798 }
2799
2800 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2801                 void __user *oldval, size_t __user *oldlenp,
2802                 void __user *newval, size_t newlen)
2803 {
2804         return -ENOSYS;
2805 }
2806
2807 #endif /* CONFIG_SYSCTL_SYSCALL */
2808
2809 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2810 {
2811         static int msg_count;
2812         int name[CTL_MAXNAME];
2813         int i;
2814
2815         /* Check args->nlen. */
2816         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2817                 return -ENOTDIR;
2818
2819         /* Read in the sysctl name for better debug message logging */
2820         for (i = 0; i < args->nlen; i++)
2821                 if (get_user(name[i], args->name + i))
2822                         return -EFAULT;
2823
2824         /* Ignore accesses to kernel.version */
2825         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2826                 return 0;
2827
2828         if (msg_count < 5) {
2829                 msg_count++;
2830                 printk(KERN_INFO
2831                         "warning: process `%s' used the deprecated sysctl "
2832                         "system call with ", current->comm);
2833                 for (i = 0; i < args->nlen; i++)
2834                         printk("%d.", name[i]);
2835                 printk("\n");
2836         }
2837         return 0;
2838 }
2839
2840 /*
2841  * No sense putting this after each symbol definition, twice,
2842  * exception granted :-)
2843  */
2844 EXPORT_SYMBOL(proc_dointvec);
2845 EXPORT_SYMBOL(proc_dointvec_jiffies);
2846 EXPORT_SYMBOL(proc_dointvec_minmax);
2847 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2848 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2849 EXPORT_SYMBOL(proc_dostring);
2850 EXPORT_SYMBOL(proc_doulongvec_minmax);
2851 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2852 EXPORT_SYMBOL(register_sysctl_table);
2853 EXPORT_SYMBOL(register_sysctl_paths);
2854 EXPORT_SYMBOL(sysctl_intvec);
2855 EXPORT_SYMBOL(sysctl_jiffies);
2856 EXPORT_SYMBOL(sysctl_ms_jiffies);
2857 EXPORT_SYMBOL(sysctl_string);
2858 EXPORT_SYMBOL(sysctl_data);
2859 EXPORT_SYMBOL(unregister_sysctl_table);