kernel/sysctl.c

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