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   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/security.h>
  41 #include <linux/initrd.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49
  50 #include <asm/uaccess.h>
  51 #include <asm/processor.h>
  52
  53 #ifdef CONFIG_X86
  54 #include <asm/nmi.h>
  55 #include <asm/stacktrace.h>
  56 #endif
  57
  58 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  59
  60 #if defined(CONFIG_SYSCTL)
  61
  62 /* External variables not in a header file. */
  63 extern int C_A_D;
  64 extern int print_fatal_signals;
  65 extern int sysctl_overcommit_memory;
  66 extern int sysctl_overcommit_ratio;
  67 extern int sysctl_panic_on_oom;
  68 extern int sysctl_oom_kill_allocating_task;
  69 extern int max_threads;
  70 extern int core_uses_pid;
  71 extern int suid_dumpable;
  72 extern char core_pattern[];
  73 extern int pid_max;
  74 extern int min_free_kbytes;
  75 extern int printk_ratelimit_jiffies;
  76 extern int printk_ratelimit_burst;
  77 extern int pid_max_min, pid_max_max;
  78 extern int sysctl_drop_caches;
  79 extern int percpu_pagelist_fraction;
  80 extern int compat_log;
  81 extern int maps_protect;
  82 extern int sysctl_stat_interval;
  83 extern int audit_argv_kb;
  84 extern int latencytop_enabled;
  85
  86 /* Constants used for minimum and  maximum */
  87 #ifdef CONFIG_DETECT_SOFTLOCKUP
  88 static int one = 1;
  89 static int sixty = 60;
  90 #endif
  91
  92 #ifdef CONFIG_MMU
  93 static int two = 2;
  94 #endif
  95
  96 static int zero;
  97 static int one_hundred = 100;
  98
  99 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 100 static int maxolduid = 65535;
 101 static int minolduid;
 102 static int min_percpu_pagelist_fract = 8;
 103
 104 static int ngroups_max = NGROUPS_MAX;
 105
 106 #ifdef CONFIG_KMOD
 107 extern char modprobe_path[];
 108 #endif
 109 #ifdef CONFIG_CHR_DEV_SG
 110 extern int sg_big_buff;
 111 #endif
 112
 113 #ifdef __sparc__
 114 extern char reboot_command [];
 115 extern int stop_a_enabled;
 116 extern int scons_pwroff;
 117 #endif
 118
 119 #ifdef __hppa__
 120 extern int pwrsw_enabled;
 121 extern int unaligned_enabled;
 122 #endif
 123
 124 #ifdef CONFIG_S390
 125 #ifdef CONFIG_MATHEMU
 126 extern int sysctl_ieee_emulation_warnings;
 127 #endif
 128 extern int sysctl_userprocess_debug;
 129 extern int spin_retry;
 130 #endif
 131
 132 extern int sysctl_hz_timer;
 133
 134 #ifdef CONFIG_BSD_PROCESS_ACCT
 135 extern int acct_parm[];
 136 #endif
 137
 138 #ifdef CONFIG_IA64
 139 extern int no_unaligned_warning;
 140 #endif
 141
 142 #ifdef CONFIG_RT_MUTEXES
 143 extern int max_lock_depth;
 144 #endif
 145
 146 #ifdef CONFIG_SYSCTL_SYSCALL
 147 static int parse_table(int __user *, int, void __user *, size_t __user *,
 148                 void __user *, size_t, struct ctl_table *);
 149 #endif
 150
 151
 152 #ifdef CONFIG_PROC_SYSCTL
 153 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 154                   void __user *buffer, size_t *lenp, loff_t *ppos);
 155 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 156                                void __user *buffer, size_t *lenp, loff_t *ppos);
 157 #endif
 158
 159 static struct ctl_table root_table[];
 160 static struct ctl_table_root sysctl_table_root;
 161 static struct ctl_table_header root_table_header = {
 162         .ctl_table = root_table,
 163         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 164         .root = &sysctl_table_root,
 165 };
 166 static struct ctl_table_root sysctl_table_root = {
 167         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 168         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 169 };
 170
 171 static struct ctl_table kern_table[];
 172 static struct ctl_table vm_table[];
 173 static struct ctl_table fs_table[];
 174 static struct ctl_table debug_table[];
 175 static struct ctl_table dev_table[];
 176 extern struct ctl_table random_table[];
 177 #ifdef CONFIG_INOTIFY_USER
 178 extern struct ctl_table inotify_table[];
 179 #endif
 180
 181 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 182 int sysctl_legacy_va_layout;
 183 #endif
 184
 185 extern int prove_locking;
 186 extern int lock_stat;
 187
 188 /* The default sysctl tables: */
 189
 190 static struct ctl_table root_table[] = {
 191         {
 192                 .ctl_name       = CTL_KERN,
 193                 .procname       = "kernel",
 194                 .mode           = 0555,
 195                 .child          = kern_table,
 196         },
 197         {
 198                 .ctl_name       = CTL_VM,
 199                 .procname       = "vm",
 200                 .mode           = 0555,
 201                 .child          = vm_table,
 202         },
 203         {
 204                 .ctl_name       = CTL_FS,
 205                 .procname       = "fs",
 206                 .mode           = 0555,
 207                 .child          = fs_table,
 208         },
 209         {
 210                 .ctl_name       = CTL_DEBUG,
 211                 .procname       = "debug",
 212                 .mode           = 0555,
 213                 .child          = debug_table,
 214         },
 215         {
 216                 .ctl_name       = CTL_DEV,
 217                 .procname       = "dev",
 218                 .mode           = 0555,
 219                 .child          = dev_table,
 220         },
 221 /*
 222  * NOTE: do not add new entries to this table unless you have read
 223  * Documentation/sysctl/ctl_unnumbered.txt
 224  */
 225         { .ctl_name = 0 }
 226 };
 227
 228 #ifdef CONFIG_SCHED_DEBUG
 229 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 230 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 231 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 232 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 233 #endif
 234
 235 static struct ctl_table kern_table[] = {
 236 #ifdef CONFIG_SCHED_DEBUG
 237         {
 238                 .ctl_name       = CTL_UNNUMBERED,
 239                 .procname       = "sched_min_granularity_ns",
 240                 .data           = &sysctl_sched_min_granularity,
 241                 .maxlen         = sizeof(unsigned int),
 242                 .mode           = 0644,
 243                 .proc_handler   = &sched_nr_latency_handler,
 244                 .strategy       = &sysctl_intvec,
 245                 .extra1         = &min_sched_granularity_ns,
 246                 .extra2         = &max_sched_granularity_ns,
 247         },
 248         {
 249                 .ctl_name       = CTL_UNNUMBERED,
 250                 .procname       = "sched_latency_ns",
 251                 .data           = &sysctl_sched_latency,
 252                 .maxlen         = sizeof(unsigned int),
 253                 .mode           = 0644,
 254                 .proc_handler   = &sched_nr_latency_handler,
 255                 .strategy       = &sysctl_intvec,
 256                 .extra1         = &min_sched_granularity_ns,
 257                 .extra2         = &max_sched_granularity_ns,
 258         },
 259         {
 260                 .ctl_name       = CTL_UNNUMBERED,
 261                 .procname       = "sched_wakeup_granularity_ns",
 262                 .data           = &sysctl_sched_wakeup_granularity,
 263                 .maxlen         = sizeof(unsigned int),
 264                 .mode           = 0644,
 265                 .proc_handler   = &proc_dointvec_minmax,
 266                 .strategy       = &sysctl_intvec,
 267                 .extra1         = &min_wakeup_granularity_ns,
 268                 .extra2         = &max_wakeup_granularity_ns,
 269         },
 270         {
 271                 .ctl_name       = CTL_UNNUMBERED,
 272                 .procname       = "sched_batch_wakeup_granularity_ns",
 273                 .data           = &sysctl_sched_batch_wakeup_granularity,
 274                 .maxlen         = sizeof(unsigned int),
 275                 .mode           = 0644,
 276                 .proc_handler   = &proc_dointvec_minmax,
 277                 .strategy       = &sysctl_intvec,
 278                 .extra1         = &min_wakeup_granularity_ns,
 279                 .extra2         = &max_wakeup_granularity_ns,
 280         },
 281         {
 282                 .ctl_name       = CTL_UNNUMBERED,
 283                 .procname       = "sched_child_runs_first",
 284                 .data           = &sysctl_sched_child_runs_first,
 285                 .maxlen         = sizeof(unsigned int),
 286                 .mode           = 0644,
 287                 .proc_handler   = &proc_dointvec,
 288         },
 289         {
 290                 .ctl_name       = CTL_UNNUMBERED,
 291                 .procname       = "sched_features",
 292                 .data           = &sysctl_sched_features,
 293                 .maxlen         = sizeof(unsigned int),
 294                 .mode           = 0644,
 295                 .proc_handler   = &proc_dointvec,
 296         },
 297         {
 298                 .ctl_name       = CTL_UNNUMBERED,
 299                 .procname       = "sched_migration_cost",
 300                 .data           = &sysctl_sched_migration_cost,
 301                 .maxlen         = sizeof(unsigned int),
 302                 .mode           = 0644,
 303                 .proc_handler   = &proc_dointvec,
 304         },
 305         {
 306                 .ctl_name       = CTL_UNNUMBERED,
 307                 .procname       = "sched_nr_migrate",
 308                 .data           = &sysctl_sched_nr_migrate,
 309                 .maxlen         = sizeof(unsigned int),
 310                 .mode           = 0644,
 311                 .proc_handler   = &proc_dointvec,
 312         },
 313         {
 314                 .ctl_name       = CTL_UNNUMBERED,
 315                 .procname       = "sched_rt_period_ms",
 316                 .data           = &sysctl_sched_rt_period,
 317                 .maxlen         = sizeof(unsigned int),
 318                 .mode           = 0644,
 319                 .proc_handler   = &proc_dointvec,
 320         },
 321         {
 322                 .ctl_name       = CTL_UNNUMBERED,
 323                 .procname       = "sched_rt_ratio",
 324                 .data           = &sysctl_sched_rt_ratio,
 325                 .maxlen         = sizeof(unsigned int),
 326                 .mode           = 0644,
 327                 .proc_handler   = &proc_dointvec,
 328         },
 329 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
 330         {
 331                 .ctl_name       = CTL_UNNUMBERED,
 332                 .procname       = "sched_min_bal_int_shares",
 333                 .data           = &sysctl_sched_min_bal_int_shares,
 334                 .maxlen         = sizeof(unsigned int),
 335                 .mode           = 0644,
 336                 .proc_handler   = &proc_dointvec,
 337         },
 338         {
 339                 .ctl_name       = CTL_UNNUMBERED,
 340                 .procname       = "sched_max_bal_int_shares",
 341                 .data           = &sysctl_sched_max_bal_int_shares,
 342                 .maxlen         = sizeof(unsigned int),
 343                 .mode           = 0644,
 344                 .proc_handler   = &proc_dointvec,
 345         },
 346 #endif
 347 #endif
 348         {
 349                 .ctl_name       = CTL_UNNUMBERED,
 350                 .procname       = "sched_compat_yield",
 351                 .data           = &sysctl_sched_compat_yield,
 352                 .maxlen         = sizeof(unsigned int),
 353                 .mode           = 0644,
 354                 .proc_handler   = &proc_dointvec,
 355         },
 356 #ifdef CONFIG_PROVE_LOCKING
 357         {
 358                 .ctl_name       = CTL_UNNUMBERED,
 359                 .procname       = "prove_locking",
 360                 .data           = &prove_locking,
 361                 .maxlen         = sizeof(int),
 362                 .mode           = 0644,
 363                 .proc_handler   = &proc_dointvec,
 364         },
 365 #endif
 366 #ifdef CONFIG_LOCK_STAT
 367         {
 368                 .ctl_name       = CTL_UNNUMBERED,
 369                 .procname       = "lock_stat",
 370                 .data           = &lock_stat,
 371                 .maxlen         = sizeof(int),
 372                 .mode           = 0644,
 373                 .proc_handler   = &proc_dointvec,
 374         },
 375 #endif
 376         {
 377                 .ctl_name       = KERN_PANIC,
 378                 .procname       = "panic",
 379                 .data           = &panic_timeout,
 380                 .maxlen         = sizeof(int),
 381                 .mode           = 0644,
 382                 .proc_handler   = &proc_dointvec,
 383         },
 384         {
 385                 .ctl_name       = KERN_CORE_USES_PID,
 386                 .procname       = "core_uses_pid",
 387                 .data           = &core_uses_pid,
 388                 .maxlen         = sizeof(int),
 389                 .mode           = 0644,
 390                 .proc_handler   = &proc_dointvec,
 391         },
 392 #ifdef CONFIG_AUDITSYSCALL
 393         {
 394                 .ctl_name       = CTL_UNNUMBERED,
 395                 .procname       = "audit_argv_kb",
 396                 .data           = &audit_argv_kb,
 397                 .maxlen         = sizeof(int),
 398                 .mode           = 0644,
 399                 .proc_handler   = &proc_dointvec,
 400         },
 401 #endif
 402         {
 403                 .ctl_name       = KERN_CORE_PATTERN,
 404                 .procname       = "core_pattern",
 405                 .data           = core_pattern,
 406                 .maxlen         = CORENAME_MAX_SIZE,
 407                 .mode           = 0644,
 408                 .proc_handler   = &proc_dostring,
 409                 .strategy       = &sysctl_string,
 410         },
 411 #ifdef CONFIG_PROC_SYSCTL
 412         {
 413                 .procname       = "tainted",
 414                 .data           = &tainted,
 415                 .maxlen         = sizeof(int),
 416                 .mode           = 0644,
 417                 .proc_handler   = &proc_dointvec_taint,
 418         },
 419 #endif
 420 #ifdef CONFIG_LATENCYTOP
 421         {
 422                 .procname       = "latencytop",
 423                 .data           = &latencytop_enabled,
 424                 .maxlen         = sizeof(int),
 425                 .mode           = 0644,
 426                 .proc_handler   = &proc_dointvec,
 427         },
 428 #endif
 429 #ifdef CONFIG_SECURITY_CAPABILITIES
 430         {
 431                 .procname       = "cap-bound",
 432                 .data           = &cap_bset,
 433                 .maxlen         = sizeof(kernel_cap_t),
 434                 .mode           = 0600,
 435                 .proc_handler   = &proc_dointvec_bset,
 436         },
 437 #endif /* def CONFIG_SECURITY_CAPABILITIES */
 438 #ifdef CONFIG_BLK_DEV_INITRD
 439         {
 440                 .ctl_name       = KERN_REALROOTDEV,
 441                 .procname       = "real-root-dev",
 442                 .data           = &real_root_dev,
 443                 .maxlen         = sizeof(int),
 444                 .mode           = 0644,
 445                 .proc_handler   = &proc_dointvec,
 446         },
 447 #endif
 448         {
 449                 .ctl_name       = CTL_UNNUMBERED,
 450                 .procname       = "print-fatal-signals",
 451                 .data           = &print_fatal_signals,
 452                 .maxlen         = sizeof(int),
 453                 .mode           = 0644,
 454                 .proc_handler   = &proc_dointvec,
 455         },
 456 #ifdef __sparc__
 457         {
 458                 .ctl_name       = KERN_SPARC_REBOOT,
 459                 .procname       = "reboot-cmd",
 460                 .data           = reboot_command,
 461                 .maxlen         = 256,
 462                 .mode           = 0644,
 463                 .proc_handler   = &proc_dostring,
 464                 .strategy       = &sysctl_string,
 465         },
 466         {
 467                 .ctl_name       = KERN_SPARC_STOP_A,
 468                 .procname       = "stop-a",
 469                 .data           = &stop_a_enabled,
 470                 .maxlen         = sizeof (int),
 471                 .mode           = 0644,
 472                 .proc_handler   = &proc_dointvec,
 473         },
 474         {
 475                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 476                 .procname       = "scons-poweroff",
 477                 .data           = &scons_pwroff,
 478                 .maxlen         = sizeof (int),
 479                 .mode           = 0644,
 480                 .proc_handler   = &proc_dointvec,
 481         },
 482 #endif
 483 #ifdef __hppa__
 484         {
 485                 .ctl_name       = KERN_HPPA_PWRSW,
 486                 .procname       = "soft-power",
 487                 .data           = &pwrsw_enabled,
 488                 .maxlen         = sizeof (int),
 489                 .mode           = 0644,
 490                 .proc_handler   = &proc_dointvec,
 491         },
 492         {
 493                 .ctl_name       = KERN_HPPA_UNALIGNED,
 494                 .procname       = "unaligned-trap",
 495                 .data           = &unaligned_enabled,
 496                 .maxlen         = sizeof (int),
 497                 .mode           = 0644,
 498                 .proc_handler   = &proc_dointvec,
 499         },
 500 #endif
 501         {
 502                 .ctl_name       = KERN_CTLALTDEL,
 503                 .procname       = "ctrl-alt-del",
 504                 .data           = &C_A_D,
 505                 .maxlen         = sizeof(int),
 506                 .mode           = 0644,
 507                 .proc_handler   = &proc_dointvec,
 508         },
 509         {
 510                 .ctl_name       = KERN_PRINTK,
 511                 .procname       = "printk",
 512                 .data           = &console_loglevel,
 513                 .maxlen         = 4*sizeof(int),
 514                 .mode           = 0644,
 515                 .proc_handler   = &proc_dointvec,
 516         },
 517 #ifdef CONFIG_KMOD
 518         {
 519                 .ctl_name       = KERN_MODPROBE,
 520                 .procname       = "modprobe",
 521                 .data           = &modprobe_path,
 522                 .maxlen         = KMOD_PATH_LEN,
 523                 .mode           = 0644,
 524                 .proc_handler   = &proc_dostring,
 525                 .strategy       = &sysctl_string,
 526         },
 527 #endif
 528 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 529         {
 530                 .ctl_name       = KERN_HOTPLUG,
 531                 .procname       = "hotplug",
 532                 .data           = &uevent_helper,
 533                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 534                 .mode           = 0644,
 535                 .proc_handler   = &proc_dostring,
 536                 .strategy       = &sysctl_string,
 537         },
 538 #endif
 539 #ifdef CONFIG_CHR_DEV_SG
 540         {
 541                 .ctl_name       = KERN_SG_BIG_BUFF,
 542                 .procname       = "sg-big-buff",
 543                 .data           = &sg_big_buff,
 544                 .maxlen         = sizeof (int),
 545                 .mode           = 0444,
 546                 .proc_handler   = &proc_dointvec,
 547         },
 548 #endif
 549 #ifdef CONFIG_BSD_PROCESS_ACCT
 550         {
 551                 .ctl_name       = KERN_ACCT,
 552                 .procname       = "acct",
 553                 .data           = &acct_parm,
 554                 .maxlen         = 3*sizeof(int),
 555                 .mode           = 0644,
 556                 .proc_handler   = &proc_dointvec,
 557         },
 558 #endif
 559 #ifdef CONFIG_MAGIC_SYSRQ
 560         {
 561                 .ctl_name       = KERN_SYSRQ,
 562                 .procname       = "sysrq",
 563                 .data           = &__sysrq_enabled,
 564                 .maxlen         = sizeof (int),
 565                 .mode           = 0644,
 566                 .proc_handler   = &proc_dointvec,
 567         },
 568 #endif
 569 #ifdef CONFIG_PROC_SYSCTL
 570         {
 571                 .procname       = "cad_pid",
 572                 .data           = NULL,
 573                 .maxlen         = sizeof (int),
 574                 .mode           = 0600,
 575                 .proc_handler   = &proc_do_cad_pid,
 576         },
 577 #endif
 578         {
 579                 .ctl_name       = KERN_MAX_THREADS,
 580                 .procname       = "threads-max",
 581                 .data           = &max_threads,
 582                 .maxlen         = sizeof(int),
 583                 .mode           = 0644,
 584                 .proc_handler   = &proc_dointvec,
 585         },
 586         {
 587                 .ctl_name       = KERN_RANDOM,
 588                 .procname       = "random",
 589                 .mode           = 0555,
 590                 .child          = random_table,
 591         },
 592         {
 593                 .ctl_name       = KERN_OVERFLOWUID,
 594                 .procname       = "overflowuid",
 595                 .data           = &overflowuid,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = &proc_dointvec_minmax,
 599                 .strategy       = &sysctl_intvec,
 600                 .extra1         = &minolduid,
 601                 .extra2         = &maxolduid,
 602         },
 603         {
 604                 .ctl_name       = KERN_OVERFLOWGID,
 605                 .procname       = "overflowgid",
 606                 .data           = &overflowgid,
 607                 .maxlen         = sizeof(int),
 608                 .mode           = 0644,
 609                 .proc_handler   = &proc_dointvec_minmax,
 610                 .strategy       = &sysctl_intvec,
 611                 .extra1         = &minolduid,
 612                 .extra2         = &maxolduid,
 613         },
 614 #ifdef CONFIG_S390
 615 #ifdef CONFIG_MATHEMU
 616         {
 617                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 618                 .procname       = "ieee_emulation_warnings",
 619                 .data           = &sysctl_ieee_emulation_warnings,
 620                 .maxlen         = sizeof(int),
 621                 .mode           = 0644,
 622                 .proc_handler   = &proc_dointvec,
 623         },
 624 #endif
 625 #ifdef CONFIG_NO_IDLE_HZ
 626         {
 627                 .ctl_name       = KERN_HZ_TIMER,
 628                 .procname       = "hz_timer",
 629                 .data           = &sysctl_hz_timer,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 .proc_handler   = &proc_dointvec,
 633         },
 634 #endif
 635         {
 636                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 637                 .procname       = "userprocess_debug",
 638                 .data           = &sysctl_userprocess_debug,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 .proc_handler   = &proc_dointvec,
 642         },
 643 #endif
 644         {
 645                 .ctl_name       = KERN_PIDMAX,
 646                 .procname       = "pid_max",
 647                 .data           = &pid_max,
 648                 .maxlen         = sizeof (int),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec_minmax,
 651                 .strategy       = sysctl_intvec,
 652                 .extra1         = &pid_max_min,
 653                 .extra2         = &pid_max_max,
 654         },
 655         {
 656                 .ctl_name       = KERN_PANIC_ON_OOPS,
 657                 .procname       = "panic_on_oops",
 658                 .data           = &panic_on_oops,
 659                 .maxlen         = sizeof(int),
 660                 .mode           = 0644,
 661                 .proc_handler   = &proc_dointvec,
 662         },
 663         {
 664                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 665                 .procname       = "printk_ratelimit",
 666                 .data           = &printk_ratelimit_jiffies,
 667                 .maxlen         = sizeof(int),
 668                 .mode           = 0644,
 669                 .proc_handler   = &proc_dointvec_jiffies,
 670                 .strategy       = &sysctl_jiffies,
 671         },
 672         {
 673                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 674                 .procname       = "printk_ratelimit_burst",
 675                 .data           = &printk_ratelimit_burst,
 676                 .maxlen         = sizeof(int),
 677                 .mode           = 0644,
 678                 .proc_handler   = &proc_dointvec,
 679         },
 680         {
 681                 .ctl_name       = KERN_NGROUPS_MAX,
 682                 .procname       = "ngroups_max",
 683                 .data           = &ngroups_max,
 684                 .maxlen         = sizeof (int),
 685                 .mode           = 0444,
 686                 .proc_handler   = &proc_dointvec,
 687         },
 688 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 689         {
 690                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 691                 .procname       = "unknown_nmi_panic",
 692                 .data           = &unknown_nmi_panic,
 693                 .maxlen         = sizeof (int),
 694                 .mode           = 0644,
 695                 .proc_handler   = &proc_dointvec,
 696         },
 697         {
 698                 .procname       = "nmi_watchdog",
 699                 .data           = &nmi_watchdog_enabled,
 700                 .maxlen         = sizeof (int),
 701                 .mode           = 0644,
 702                 .proc_handler   = &proc_nmi_enabled,
 703         },
 704 #endif
 705 #if defined(CONFIG_X86)
 706         {
 707                 .ctl_name       = KERN_PANIC_ON_NMI,
 708                 .procname       = "panic_on_unrecovered_nmi",
 709                 .data           = &panic_on_unrecovered_nmi,
 710                 .maxlen         = sizeof(int),
 711                 .mode           = 0644,
 712                 .proc_handler   = &proc_dointvec,
 713         },
 714         {
 715                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 716                 .procname       = "bootloader_type",
 717                 .data           = &bootloader_type,
 718                 .maxlen         = sizeof (int),
 719                 .mode           = 0444,
 720                 .proc_handler   = &proc_dointvec,
 721         },
 722         {
 723                 .ctl_name       = CTL_UNNUMBERED,
 724                 .procname       = "kstack_depth_to_print",
 725                 .data           = &kstack_depth_to_print,
 726                 .maxlen         = sizeof(int),
 727                 .mode           = 0644,
 728                 .proc_handler   = &proc_dointvec,
 729         },
 730 #endif
 731 #if defined(CONFIG_MMU)
 732         {
 733                 .ctl_name       = KERN_RANDOMIZE,
 734                 .procname       = "randomize_va_space",
 735                 .data           = &randomize_va_space,
 736                 .maxlen         = sizeof(int),
 737                 .mode           = 0644,
 738                 .proc_handler   = &proc_dointvec,
 739         },
 740 #endif
 741 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 742         {
 743                 .ctl_name       = KERN_SPIN_RETRY,
 744                 .procname       = "spin_retry",
 745                 .data           = &spin_retry,
 746                 .maxlen         = sizeof (int),
 747                 .mode           = 0644,
 748                 .proc_handler   = &proc_dointvec,
 749         },
 750 #endif
 751 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 752         {
 753                 .procname       = "acpi_video_flags",
 754                 .data           = &acpi_realmode_flags,
 755                 .maxlen         = sizeof (unsigned long),
 756                 .mode           = 0644,
 757                 .proc_handler   = &proc_doulongvec_minmax,
 758         },
 759 #endif
 760 #ifdef CONFIG_IA64
 761         {
 762                 .ctl_name       = KERN_IA64_UNALIGNED,
 763                 .procname       = "ignore-unaligned-usertrap",
 764                 .data           = &no_unaligned_warning,
 765                 .maxlen         = sizeof (int),
 766                 .mode           = 0644,
 767                 .proc_handler   = &proc_dointvec,
 768         },
 769 #endif
 770 #ifdef CONFIG_DETECT_SOFTLOCKUP
 771         {
 772                 .ctl_name       = CTL_UNNUMBERED,
 773                 .procname       = "softlockup_thresh",
 774                 .data           = &softlockup_thresh,
 775                 .maxlen         = sizeof(unsigned long),
 776                 .mode           = 0644,
 777                 .proc_handler   = &proc_doulongvec_minmax,
 778                 .strategy       = &sysctl_intvec,
 779                 .extra1         = &one,
 780                 .extra2         = &sixty,
 781         },
 782         {
 783                 .ctl_name       = CTL_UNNUMBERED,
 784                 .procname       = "hung_task_check_count",
 785                 .data           = &sysctl_hung_task_check_count,
 786                 .maxlen         = sizeof(unsigned long),
 787                 .mode           = 0644,
 788                 .proc_handler   = &proc_doulongvec_minmax,
 789                 .strategy       = &sysctl_intvec,
 790         },
 791         {
 792                 .ctl_name       = CTL_UNNUMBERED,
 793                 .procname       = "hung_task_timeout_secs",
 794                 .data           = &sysctl_hung_task_timeout_secs,
 795                 .maxlen         = sizeof(unsigned long),
 796                 .mode           = 0644,
 797                 .proc_handler   = &proc_doulongvec_minmax,
 798                 .strategy       = &sysctl_intvec,
 799         },
 800         {
 801                 .ctl_name       = CTL_UNNUMBERED,
 802                 .procname       = "hung_task_warnings",
 803                 .data           = &sysctl_hung_task_warnings,
 804                 .maxlen         = sizeof(unsigned long),
 805                 .mode           = 0644,
 806                 .proc_handler   = &proc_doulongvec_minmax,
 807                 .strategy       = &sysctl_intvec,
 808         },
 809 #endif
 810 #ifdef CONFIG_COMPAT
 811         {
 812                 .ctl_name       = KERN_COMPAT_LOG,
 813                 .procname       = "compat-log",
 814                 .data           = &compat_log,
 815                 .maxlen         = sizeof (int),
 816                 .mode           = 0644,
 817                 .proc_handler   = &proc_dointvec,
 818         },
 819 #endif
 820 #ifdef CONFIG_RT_MUTEXES
 821         {
 822                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 823                 .procname       = "max_lock_depth",
 824                 .data           = &max_lock_depth,
 825                 .maxlen         = sizeof(int),
 826                 .mode           = 0644,
 827                 .proc_handler   = &proc_dointvec,
 828         },
 829 #endif
 830 #ifdef CONFIG_PROC_FS
 831         {
 832                 .ctl_name       = CTL_UNNUMBERED,
 833                 .procname       = "maps_protect",
 834                 .data           = &maps_protect,
 835                 .maxlen         = sizeof(int),
 836                 .mode           = 0644,
 837                 .proc_handler   = &proc_dointvec,
 838         },
 839 #endif
 840         {
 841                 .ctl_name       = CTL_UNNUMBERED,
 842                 .procname       = "poweroff_cmd",
 843                 .data           = &poweroff_cmd,
 844                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 845                 .mode           = 0644,
 846                 .proc_handler   = &proc_dostring,
 847                 .strategy       = &sysctl_string,
 848         },
 849 /*
 850  * NOTE: do not add new entries to this table unless you have read
 851  * Documentation/sysctl/ctl_unnumbered.txt
 852  */
 853         { .ctl_name = 0 }
 854 };
 855
 856 static struct ctl_table vm_table[] = {
 857         {
 858                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 859                 .procname       = "overcommit_memory",
 860                 .data           = &sysctl_overcommit_memory,
 861                 .maxlen         = sizeof(sysctl_overcommit_memory),
 862                 .mode           = 0644,
 863                 .proc_handler   = &proc_dointvec,
 864         },
 865         {
 866                 .ctl_name       = VM_PANIC_ON_OOM,
 867                 .procname       = "panic_on_oom",
 868                 .data           = &sysctl_panic_on_oom,
 869                 .maxlen         = sizeof(sysctl_panic_on_oom),
 870                 .mode           = 0644,
 871                 .proc_handler   = &proc_dointvec,
 872         },
 873         {
 874                 .ctl_name       = CTL_UNNUMBERED,
 875                 .procname       = "oom_kill_allocating_task",
 876                 .data           = &sysctl_oom_kill_allocating_task,
 877                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 878                 .mode           = 0644,
 879                 .proc_handler   = &proc_dointvec,
 880         },
 881         {
 882                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 883                 .procname       = "overcommit_ratio",
 884                 .data           = &sysctl_overcommit_ratio,
 885                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 886                 .mode           = 0644,
 887                 .proc_handler   = &proc_dointvec,
 888         },
 889         {
 890                 .ctl_name       = VM_PAGE_CLUSTER,
 891                 .procname       = "page-cluster",
 892                 .data           = &page_cluster,
 893                 .maxlen         = sizeof(int),
 894                 .mode           = 0644,
 895                 .proc_handler   = &proc_dointvec,
 896         },
 897         {
 898                 .ctl_name       = VM_DIRTY_BACKGROUND,
 899                 .procname       = "dirty_background_ratio",
 900                 .data           = &dirty_background_ratio,
 901                 .maxlen         = sizeof(dirty_background_ratio),
 902                 .mode           = 0644,
 903                 .proc_handler   = &proc_dointvec_minmax,
 904                 .strategy       = &sysctl_intvec,
 905                 .extra1         = &zero,
 906                 .extra2         = &one_hundred,
 907         },
 908         {
 909                 .ctl_name       = VM_DIRTY_RATIO,
 910                 .procname       = "dirty_ratio",
 911                 .data           = &vm_dirty_ratio,
 912                 .maxlen         = sizeof(vm_dirty_ratio),
 913                 .mode           = 0644,
 914                 .proc_handler   = &dirty_ratio_handler,
 915                 .strategy       = &sysctl_intvec,
 916                 .extra1         = &zero,
 917                 .extra2         = &one_hundred,
 918         },
 919         {
 920                 .procname       = "dirty_writeback_centisecs",
 921                 .data           = &dirty_writeback_interval,
 922                 .maxlen         = sizeof(dirty_writeback_interval),
 923                 .mode           = 0644,
 924                 .proc_handler   = &dirty_writeback_centisecs_handler,
 925         },
 926         {
 927                 .procname       = "dirty_expire_centisecs",
 928                 .data           = &dirty_expire_interval,
 929                 .maxlen         = sizeof(dirty_expire_interval),
 930                 .mode           = 0644,
 931                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 932         },
 933         {
 934                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 935                 .procname       = "nr_pdflush_threads",
 936                 .data           = &nr_pdflush_threads,
 937                 .maxlen         = sizeof nr_pdflush_threads,
 938                 .mode           = 0444 /* read-only*/,
 939                 .proc_handler   = &proc_dointvec,
 940         },
 941         {
 942                 .ctl_name       = VM_SWAPPINESS,
 943                 .procname       = "swappiness",
 944                 .data           = &vm_swappiness,
 945                 .maxlen         = sizeof(vm_swappiness),
 946                 .mode           = 0644,
 947                 .proc_handler   = &proc_dointvec_minmax,
 948                 .strategy       = &sysctl_intvec,
 949                 .extra1         = &zero,
 950                 .extra2         = &one_hundred,
 951         },
 952 #ifdef CONFIG_HUGETLB_PAGE
 953          {
 954                 .procname       = "nr_hugepages",
 955                 .data           = &max_huge_pages,
 956                 .maxlen         = sizeof(unsigned long),
 957                 .mode           = 0644,
 958                 .proc_handler   = &hugetlb_sysctl_handler,
 959                 .extra1         = (void *)&hugetlb_zero,
 960                 .extra2         = (void *)&hugetlb_infinity,
 961          },
 962          {
 963                 .ctl_name       = VM_HUGETLB_GROUP,
 964                 .procname       = "hugetlb_shm_group",
 965                 .data           = &sysctl_hugetlb_shm_group,
 966                 .maxlen         = sizeof(gid_t),
 967                 .mode           = 0644,
 968                 .proc_handler   = &proc_dointvec,
 969          },
 970          {
 971                 .ctl_name       = CTL_UNNUMBERED,
 972                 .procname       = "hugepages_treat_as_movable",
 973                 .data           = &hugepages_treat_as_movable,
 974                 .maxlen         = sizeof(int),
 975                 .mode           = 0644,
 976                 .proc_handler   = &hugetlb_treat_movable_handler,
 977         },
 978         {
 979                 .ctl_name       = CTL_UNNUMBERED,
 980                 .procname       = "nr_overcommit_hugepages",
 981                 .data           = &nr_overcommit_huge_pages,
 982                 .maxlen         = sizeof(nr_overcommit_huge_pages),
 983                 .mode           = 0644,
 984                 .proc_handler   = &proc_doulongvec_minmax,
 985         },
 986 #endif
 987         {
 988                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 989                 .procname       = "lowmem_reserve_ratio",
 990                 .data           = &sysctl_lowmem_reserve_ratio,
 991                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 992                 .mode           = 0644,
 993                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 994                 .strategy       = &sysctl_intvec,
 995         },
 996         {
 997                 .ctl_name       = VM_DROP_PAGECACHE,
 998                 .procname       = "drop_caches",
 999                 .data           = &sysctl_drop_caches,
1000                 .maxlen         = sizeof(int),
1001                 .mode           = 0644,
1002                 .proc_handler   = drop_caches_sysctl_handler,
1003                 .strategy       = &sysctl_intvec,
1004         },
1005         {
1006                 .ctl_name       = VM_MIN_FREE_KBYTES,
1007                 .procname       = "min_free_kbytes",
1008                 .data           = &min_free_kbytes,
1009                 .maxlen         = sizeof(min_free_kbytes),
1010                 .mode           = 0644,
1011                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1012                 .strategy       = &sysctl_intvec,
1013                 .extra1         = &zero,
1014         },
1015         {
1016                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1017                 .procname       = "percpu_pagelist_fraction",
1018                 .data           = &percpu_pagelist_fraction,
1019                 .maxlen         = sizeof(percpu_pagelist_fraction),
1020                 .mode           = 0644,
1021                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1022                 .strategy       = &sysctl_intvec,
1023                 .extra1         = &min_percpu_pagelist_fract,
1024         },
1025 #ifdef CONFIG_MMU
1026         {
1027                 .ctl_name       = VM_MAX_MAP_COUNT,
1028                 .procname       = "max_map_count",
1029                 .data           = &sysctl_max_map_count,
1030                 .maxlen         = sizeof(sysctl_max_map_count),
1031                 .mode           = 0644,
1032                 .proc_handler   = &proc_dointvec
1033         },
1034 #endif
1035         {
1036                 .ctl_name       = VM_LAPTOP_MODE,
1037                 .procname       = "laptop_mode",
1038                 .data           = &laptop_mode,
1039                 .maxlen         = sizeof(laptop_mode),
1040                 .mode           = 0644,
1041                 .proc_handler   = &proc_dointvec_jiffies,
1042                 .strategy       = &sysctl_jiffies,
1043         },
1044         {
1045                 .ctl_name       = VM_BLOCK_DUMP,
1046                 .procname       = "block_dump",
1047                 .data           = &block_dump,
1048                 .maxlen         = sizeof(block_dump),
1049                 .mode           = 0644,
1050                 .proc_handler   = &proc_dointvec,
1051                 .strategy       = &sysctl_intvec,
1052                 .extra1         = &zero,
1053         },
1054         {
1055                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1056                 .procname       = "vfs_cache_pressure",
1057                 .data           = &sysctl_vfs_cache_pressure,
1058                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1059                 .mode           = 0644,
1060                 .proc_handler   = &proc_dointvec,
1061                 .strategy       = &sysctl_intvec,
1062                 .extra1         = &zero,
1063         },
1064 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1065         {
1066                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1067                 .procname       = "legacy_va_layout",
1068                 .data           = &sysctl_legacy_va_layout,
1069                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1070                 .mode           = 0644,
1071                 .proc_handler   = &proc_dointvec,
1072                 .strategy       = &sysctl_intvec,
1073                 .extra1         = &zero,
1074         },
1075 #endif
1076 #ifdef CONFIG_NUMA
1077         {
1078                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1079                 .procname       = "zone_reclaim_mode",
1080                 .data           = &zone_reclaim_mode,
1081                 .maxlen         = sizeof(zone_reclaim_mode),
1082                 .mode           = 0644,
1083                 .proc_handler   = &proc_dointvec,
1084                 .strategy       = &sysctl_intvec,
1085                 .extra1         = &zero,
1086         },
1087         {
1088                 .ctl_name       = VM_MIN_UNMAPPED,
1089                 .procname       = "min_unmapped_ratio",
1090                 .data           = &sysctl_min_unmapped_ratio,
1091                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1092                 .mode           = 0644,
1093                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1094                 .strategy       = &sysctl_intvec,
1095                 .extra1         = &zero,
1096                 .extra2         = &one_hundred,
1097         },
1098         {
1099                 .ctl_name       = VM_MIN_SLAB,
1100                 .procname       = "min_slab_ratio",
1101                 .data           = &sysctl_min_slab_ratio,
1102                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1103                 .mode           = 0644,
1104                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1105                 .strategy       = &sysctl_intvec,
1106                 .extra1         = &zero,
1107                 .extra2         = &one_hundred,
1108         },
1109 #endif
1110 #ifdef CONFIG_SMP
1111         {
1112                 .ctl_name       = CTL_UNNUMBERED,
1113                 .procname       = "stat_interval",
1114                 .data           = &sysctl_stat_interval,
1115                 .maxlen         = sizeof(sysctl_stat_interval),
1116                 .mode           = 0644,
1117                 .proc_handler   = &proc_dointvec_jiffies,
1118                 .strategy       = &sysctl_jiffies,
1119         },
1120 #endif
1121 #ifdef CONFIG_SECURITY
1122         {
1123                 .ctl_name       = CTL_UNNUMBERED,
1124                 .procname       = "mmap_min_addr",
1125                 .data           = &mmap_min_addr,
1126                 .maxlen         = sizeof(unsigned long),
1127                 .mode           = 0644,
1128                 .proc_handler   = &proc_doulongvec_minmax,
1129         },
1130 #endif
1131 #ifdef CONFIG_NUMA
1132         {
1133                 .ctl_name       = CTL_UNNUMBERED,
1134                 .procname       = "numa_zonelist_order",
1135                 .data           = &numa_zonelist_order,
1136                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1137                 .mode           = 0644,
1138                 .proc_handler   = &numa_zonelist_order_handler,
1139                 .strategy       = &sysctl_string,
1140         },
1141 #endif
1142 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1143    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1144         {
1145                 .ctl_name       = VM_VDSO_ENABLED,
1146                 .procname       = "vdso_enabled",
1147                 .data           = &vdso_enabled,
1148                 .maxlen         = sizeof(vdso_enabled),
1149                 .mode           = 0644,
1150                 .proc_handler   = &proc_dointvec,
1151                 .strategy       = &sysctl_intvec,
1152                 .extra1         = &zero,
1153         },
1154 #endif
1155 /*
1156  * NOTE: do not add new entries to this table unless you have read
1157  * Documentation/sysctl/ctl_unnumbered.txt
1158  */
1159         { .ctl_name = 0 }
1160 };
1161
1162 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1163 static struct ctl_table binfmt_misc_table[] = {
1164         { .ctl_name = 0 }
1165 };
1166 #endif
1167
1168 static struct ctl_table fs_table[] = {
1169         {
1170                 .ctl_name       = FS_NRINODE,
1171                 .procname       = "inode-nr",
1172                 .data           = &inodes_stat,
1173                 .maxlen         = 2*sizeof(int),
1174                 .mode           = 0444,
1175                 .proc_handler   = &proc_dointvec,
1176         },
1177         {
1178                 .ctl_name       = FS_STATINODE,
1179                 .procname       = "inode-state",
1180                 .data           = &inodes_stat,
1181                 .maxlen         = 7*sizeof(int),
1182                 .mode           = 0444,
1183                 .proc_handler   = &proc_dointvec,
1184         },
1185         {
1186                 .procname       = "file-nr",
1187                 .data           = &files_stat,
1188                 .maxlen         = 3*sizeof(int),
1189                 .mode           = 0444,
1190                 .proc_handler   = &proc_nr_files,
1191         },
1192         {
1193                 .ctl_name       = FS_MAXFILE,
1194                 .procname       = "file-max",
1195                 .data           = &files_stat.max_files,
1196                 .maxlen         = sizeof(int),
1197                 .mode           = 0644,
1198                 .proc_handler   = &proc_dointvec,
1199         },
1200         {
1201                 .ctl_name       = FS_DENTRY,
1202                 .procname       = "dentry-state",
1203                 .data           = &dentry_stat,
1204                 .maxlen         = 6*sizeof(int),
1205                 .mode           = 0444,
1206                 .proc_handler   = &proc_dointvec,
1207         },
1208         {
1209                 .ctl_name       = FS_OVERFLOWUID,
1210                 .procname       = "overflowuid",
1211                 .data           = &fs_overflowuid,
1212                 .maxlen         = sizeof(int),
1213                 .mode           = 0644,
1214                 .proc_handler   = &proc_dointvec_minmax,
1215                 .strategy       = &sysctl_intvec,
1216                 .extra1         = &minolduid,
1217                 .extra2         = &maxolduid,
1218         },
1219         {
1220                 .ctl_name       = FS_OVERFLOWGID,
1221                 .procname       = "overflowgid",
1222                 .data           = &fs_overflowgid,
1223                 .maxlen         = sizeof(int),
1224                 .mode           = 0644,
1225                 .proc_handler   = &proc_dointvec_minmax,
1226                 .strategy       = &sysctl_intvec,
1227                 .extra1         = &minolduid,
1228                 .extra2         = &maxolduid,
1229         },
1230         {
1231                 .ctl_name       = FS_LEASES,
1232                 .procname       = "leases-enable",
1233                 .data           = &leases_enable,
1234                 .maxlen         = sizeof(int),
1235                 .mode           = 0644,
1236                 .proc_handler   = &proc_dointvec,
1237         },
1238 #ifdef CONFIG_DNOTIFY
1239         {
1240                 .ctl_name       = FS_DIR_NOTIFY,
1241                 .procname       = "dir-notify-enable",
1242                 .data           = &dir_notify_enable,
1243                 .maxlen         = sizeof(int),
1244                 .mode           = 0644,
1245                 .proc_handler   = &proc_dointvec,
1246         },
1247 #endif
1248 #ifdef CONFIG_MMU
1249         {
1250                 .ctl_name       = FS_LEASE_TIME,
1251                 .procname       = "lease-break-time",
1252                 .data           = &lease_break_time,
1253                 .maxlen         = sizeof(int),
1254                 .mode           = 0644,
1255                 .proc_handler   = &proc_dointvec_minmax,
1256                 .strategy       = &sysctl_intvec,
1257                 .extra1         = &zero,
1258                 .extra2         = &two,
1259         },
1260         {
1261                 .procname       = "aio-nr",
1262                 .data           = &aio_nr,
1263                 .maxlen         = sizeof(aio_nr),
1264                 .mode           = 0444,
1265                 .proc_handler   = &proc_doulongvec_minmax,
1266         },
1267         {
1268                 .procname       = "aio-max-nr",
1269                 .data           = &aio_max_nr,
1270                 .maxlen         = sizeof(aio_max_nr),
1271                 .mode           = 0644,
1272                 .proc_handler   = &proc_doulongvec_minmax,
1273         },
1274 #ifdef CONFIG_INOTIFY_USER
1275         {
1276                 .ctl_name       = FS_INOTIFY,
1277                 .procname       = "inotify",
1278                 .mode           = 0555,
1279                 .child          = inotify_table,
1280         },
1281 #endif
1282 #endif
1283         {
1284                 .ctl_name       = KERN_SETUID_DUMPABLE,
1285                 .procname       = "suid_dumpable",
1286                 .data           = &suid_dumpable,
1287                 .maxlen         = sizeof(int),
1288                 .mode           = 0644,
1289                 .proc_handler   = &proc_dointvec,
1290         },
1291 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1292         {
1293                 .ctl_name       = CTL_UNNUMBERED,
1294                 .procname       = "binfmt_misc",
1295                 .mode           = 0555,
1296                 .child          = binfmt_misc_table,
1297         },
1298 #endif
1299 /*
1300  * NOTE: do not add new entries to this table unless you have read
1301  * Documentation/sysctl/ctl_unnumbered.txt
1302  */
1303         { .ctl_name = 0 }
1304 };
1305
1306 static struct ctl_table debug_table[] = {
1307 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1308         {
1309                 .ctl_name       = CTL_UNNUMBERED,
1310                 .procname       = "exception-trace",
1311                 .data           = &show_unhandled_signals,
1312                 .maxlen         = sizeof(int),
1313                 .mode           = 0644,
1314                 .proc_handler   = proc_dointvec
1315         },
1316 #endif
1317         { .ctl_name = 0 }
1318 };
1319
1320 static struct ctl_table dev_table[] = {
1321         { .ctl_name = 0 }
1322 };
1323
1324 static DEFINE_SPINLOCK(sysctl_lock);
1325
1326 /* called under sysctl_lock */
1327 static int use_table(struct ctl_table_header *p)
1328 {
1329         if (unlikely(p->unregistering))
1330                 return 0;
1331         p->used++;
1332         return 1;
1333 }
1334
1335 /* called under sysctl_lock */
1336 static void unuse_table(struct ctl_table_header *p)
1337 {
1338         if (!--p->used)
1339                 if (unlikely(p->unregistering))
1340                         complete(p->unregistering);
1341 }
1342
1343 /* called under sysctl_lock, will reacquire if has to wait */
1344 static void start_unregistering(struct ctl_table_header *p)
1345 {
1346         /*
1347          * if p->used is 0, nobody will ever touch that entry again;
1348          * we'll eliminate all paths to it before dropping sysctl_lock
1349          */
1350         if (unlikely(p->used)) {
1351                 struct completion wait;
1352                 init_completion(&wait);
1353                 p->unregistering = &wait;
1354                 spin_unlock(&sysctl_lock);
1355                 wait_for_completion(&wait);
1356                 spin_lock(&sysctl_lock);
1357         }
1358         /*
1359          * do not remove from the list until nobody holds it; walking the
1360          * list in do_sysctl() relies on that.
1361          */
1362         list_del_init(&p->ctl_entry);
1363 }
1364
1365 void sysctl_head_finish(struct ctl_table_header *head)
1366 {
1367         if (!head)
1368                 return;
1369         spin_lock(&sysctl_lock);
1370         unuse_table(head);
1371         spin_unlock(&sysctl_lock);
1372 }
1373
1374 static struct list_head *
1375 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1376 {
1377         struct list_head *header_list;
1378         header_list = &root->header_list;
1379         if (root->lookup)
1380                 header_list = root->lookup(root, namespaces);
1381         return header_list;
1382 }
1383
1384 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1385                                             struct ctl_table_header *prev)
1386 {
1387         struct ctl_table_root *root;
1388         struct list_head *header_list;
1389         struct ctl_table_header *head;
1390         struct list_head *tmp;
1391
1392         spin_lock(&sysctl_lock);
1393         if (prev) {
1394                 head = prev;
1395                 tmp = &prev->ctl_entry;
1396                 unuse_table(prev);
1397                 goto next;
1398         }
1399         tmp = &root_table_header.ctl_entry;
1400         for (;;) {
1401                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1402
1403                 if (!use_table(head))
1404                         goto next;
1405                 spin_unlock(&sysctl_lock);
1406                 return head;
1407         next:
1408                 root = head->root;
1409                 tmp = tmp->next;
1410                 header_list = lookup_header_list(root, namespaces);
1411                 if (tmp != header_list)
1412                         continue;
1413
1414                 do {
1415                         root = list_entry(root->root_list.next,
1416                                         struct ctl_table_root, root_list);
1417                         if (root == &sysctl_table_root)
1418                                 goto out;
1419                         header_list = lookup_header_list(root, namespaces);
1420                 } while (list_empty(header_list));
1421                 tmp = header_list->next;
1422         }
1423 out:
1424         spin_unlock(&sysctl_lock);
1425         return NULL;
1426 }
1427
1428 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1429 {
1430         return __sysctl_head_next(current->nsproxy, prev);
1431 }
1432
1433 void register_sysctl_root(struct ctl_table_root *root)
1434 {
1435         spin_lock(&sysctl_lock);
1436         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1437         spin_unlock(&sysctl_lock);
1438 }
1439
1440 #ifdef CONFIG_SYSCTL_SYSCALL
1441 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1442                void __user *newval, size_t newlen)
1443 {
1444         struct ctl_table_header *head;
1445         int error = -ENOTDIR;
1446
1447         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1448                 return -ENOTDIR;
1449         if (oldval) {
1450                 int old_len;
1451                 if (!oldlenp || get_user(old_len, oldlenp))
1452                         return -EFAULT;
1453         }
1454
1455         for (head = sysctl_head_next(NULL); head;
1456                         head = sysctl_head_next(head)) {
1457                 error = parse_table(name, nlen, oldval, oldlenp,
1458                                         newval, newlen, head->ctl_table);
1459                 if (error != -ENOTDIR) {
1460                         sysctl_head_finish(head);
1461                         break;
1462                 }
1463         }
1464         return error;
1465 }
1466
1467 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1468 {
1469         struct __sysctl_args tmp;
1470         int error;
1471
1472         if (copy_from_user(&tmp, args, sizeof(tmp)))
1473                 return -EFAULT;
1474
1475         error = deprecated_sysctl_warning(&tmp);
1476         if (error)
1477                 goto out;
1478
1479         lock_kernel();
1480         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1481                           tmp.newval, tmp.newlen);
1482         unlock_kernel();
1483 out:
1484         return error;
1485 }
1486 #endif /* CONFIG_SYSCTL_SYSCALL */
1487
1488 /*
1489  * sysctl_perm does NOT grant the superuser all rights automatically, because
1490  * some sysctl variables are readonly even to root.
1491  */
1492
1493 static int test_perm(int mode, int op)
1494 {
1495         if (!current->euid)
1496                 mode >>= 6;
1497         else if (in_egroup_p(0))
1498                 mode >>= 3;
1499         if ((mode & op & 0007) == op)
1500                 return 0;
1501         return -EACCES;
1502 }
1503
1504 int sysctl_perm(struct ctl_table *table, int op)
1505 {
1506         int error;
1507         error = security_sysctl(table, op);
1508         if (error)
1509                 return error;
1510         return test_perm(table->mode, op);
1511 }
1512
1513 #ifdef CONFIG_SYSCTL_SYSCALL
1514 static int parse_table(int __user *name, int nlen,
1515                        void __user *oldval, size_t __user *oldlenp,
1516                        void __user *newval, size_t newlen,
1517                        struct ctl_table *table)
1518 {
1519         int n;
1520 repeat:
1521         if (!nlen)
1522                 return -ENOTDIR;
1523         if (get_user(n, name))
1524                 return -EFAULT;
1525         for ( ; table->ctl_name || table->procname; table++) {
1526                 if (!table->ctl_name)
1527                         continue;
1528                 if (n == table->ctl_name) {
1529                         int error;
1530                         if (table->child) {
1531                                 if (sysctl_perm(table, 001))
1532                                         return -EPERM;
1533                                 name++;
1534                                 nlen--;
1535                                 table = table->child;
1536                                 goto repeat;
1537                         }
1538                         error = do_sysctl_strategy(table, name, nlen,
1539                                                    oldval, oldlenp,
1540                                                    newval, newlen);
1541                         return error;
1542                 }
1543         }
1544         return -ENOTDIR;
1545 }
1546
1547 /* Perform the actual read/write of a sysctl table entry. */
1548 int do_sysctl_strategy (struct ctl_table *table,
1549                         int __user *name, int nlen,
1550                         void __user *oldval, size_t __user *oldlenp,
1551                         void __user *newval, size_t newlen)
1552 {
1553         int op = 0, rc;
1554
1555         if (oldval)
1556                 op |= 004;
1557         if (newval)
1558                 op |= 002;
1559         if (sysctl_perm(table, op))
1560                 return -EPERM;
1561
1562         if (table->strategy) {
1563                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1564                                      newval, newlen);
1565                 if (rc < 0)
1566                         return rc;
1567                 if (rc > 0)
1568                         return 0;
1569         }
1570
1571         /* If there is no strategy routine, or if the strategy returns
1572          * zero, proceed with automatic r/w */
1573         if (table->data && table->maxlen) {
1574                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1575                                  newval, newlen);
1576                 if (rc < 0)
1577                         return rc;
1578         }
1579         return 0;
1580 }
1581 #endif /* CONFIG_SYSCTL_SYSCALL */
1582
1583 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1584 {
1585         for (; table->ctl_name || table->procname; table++) {
1586                 table->parent = parent;
1587                 if (table->child)
1588                         sysctl_set_parent(table, table->child);
1589         }
1590 }
1591
1592 static __init int sysctl_init(void)
1593 {
1594         int err;
1595         sysctl_set_parent(NULL, root_table);
1596         err = sysctl_check_table(current->nsproxy, root_table);
1597         return 0;
1598 }
1599
1600 core_initcall(sysctl_init);
1601
1602 /**
1603  * __register_sysctl_paths - register a sysctl hierarchy
1604  * @root: List of sysctl headers to register on
1605  * @namespaces: Data to compute which lists of sysctl entries are visible
1606  * @path: The path to the directory the sysctl table is in.
1607  * @table: the top-level table structure
1608  *
1609  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1610  * array. A completely 0 filled entry terminates the table.
1611  *
1612  * The members of the &struct ctl_table structure are used as follows:
1613  *
1614  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1615  *            must be unique within that level of sysctl
1616  *
1617  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1618  *            enter a sysctl file
1619  *
1620  * data - a pointer to data for use by proc_handler
1621  *
1622  * maxlen - the maximum size in bytes of the data
1623  *
1624  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1625  *
1626  * child - a pointer to the child sysctl table if this entry is a directory, or
1627  *         %NULL.
1628  *
1629  * proc_handler - the text handler routine (described below)
1630  *
1631  * strategy - the strategy routine (described below)
1632  *
1633  * de - for internal use by the sysctl routines
1634  *
1635  * extra1, extra2 - extra pointers usable by the proc handler routines
1636  *
1637  * Leaf nodes in the sysctl tree will be represented by a single file
1638  * under /proc; non-leaf nodes will be represented by directories.
1639  *
1640  * sysctl(2) can automatically manage read and write requests through
1641  * the sysctl table.  The data and maxlen fields of the ctl_table
1642  * struct enable minimal validation of the values being written to be
1643  * performed, and the mode field allows minimal authentication.
1644  *
1645  * More sophisticated management can be enabled by the provision of a
1646  * strategy routine with the table entry.  This will be called before
1647  * any automatic read or write of the data is performed.
1648  *
1649  * The strategy routine may return
1650  *
1651  * < 0 - Error occurred (error is passed to user process)
1652  *
1653  * 0   - OK - proceed with automatic read or write.
1654  *
1655  * > 0 - OK - read or write has been done by the strategy routine, so
1656  *       return immediately.
1657  *
1658  * There must be a proc_handler routine for any terminal nodes
1659  * mirrored under /proc/sys (non-terminals are handled by a built-in
1660  * directory handler).  Several default handlers are available to
1661  * cover common cases -
1662  *
1663  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1664  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1665  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1666  *
1667  * It is the handler's job to read the input buffer from user memory
1668  * and process it. The handler should return 0 on success.
1669  *
1670  * This routine returns %NULL on a failure to register, and a pointer
1671  * to the table header on success.
1672  */
1673 struct ctl_table_header *__register_sysctl_paths(
1674         struct ctl_table_root *root,
1675         struct nsproxy *namespaces,
1676         const struct ctl_path *path, struct ctl_table *table)
1677 {
1678         struct list_head *header_list;
1679         struct ctl_table_header *header;
1680         struct ctl_table *new, **prevp;
1681         unsigned int n, npath;
1682
1683         /* Count the path components */
1684         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1685                 ;
1686
1687         /*
1688          * For each path component, allocate a 2-element ctl_table array.
1689          * The first array element will be filled with the sysctl entry
1690          * for this, the second will be the sentinel (ctl_name == 0).
1691          *
1692          * We allocate everything in one go so that we don't have to
1693          * worry about freeing additional memory in unregister_sysctl_table.
1694          */
1695         header = kzalloc(sizeof(struct ctl_table_header) +
1696                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1697         if (!header)
1698                 return NULL;
1699
1700         new = (struct ctl_table *) (header + 1);
1701
1702         /* Now connect the dots */
1703         prevp = &header->ctl_table;
1704         for (n = 0; n < npath; ++n, ++path) {
1705                 /* Copy the procname */
1706                 new->procname = path->procname;
1707                 new->ctl_name = path->ctl_name;
1708                 new->mode     = 0555;
1709
1710                 *prevp = new;
1711                 prevp = &new->child;
1712
1713                 new += 2;
1714         }
1715         *prevp = table;
1716         header->ctl_table_arg = table;
1717
1718         INIT_LIST_HEAD(&header->ctl_entry);
1719         header->used = 0;
1720         header->unregistering = NULL;
1721         header->root = root;
1722         sysctl_set_parent(NULL, header->ctl_table);
1723         if (sysctl_check_table(namespaces, header->ctl_table)) {
1724                 kfree(header);
1725                 return NULL;
1726         }
1727         spin_lock(&sysctl_lock);
1728         header_list = lookup_header_list(root, namespaces);
1729         list_add_tail(&header->ctl_entry, header_list);
1730         spin_unlock(&sysctl_lock);
1731
1732         return header;
1733 }
1734
1735 /**
1736  * register_sysctl_table_path - register a sysctl table hierarchy
1737  * @path: The path to the directory the sysctl table is in.
1738  * @table: the top-level table structure
1739  *
1740  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1741  * array. A completely 0 filled entry terminates the table.
1742  *
1743  * See __register_sysctl_paths for more details.
1744  */
1745 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1746                                                 struct ctl_table *table)
1747 {
1748         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1749                                         path, table);
1750 }
1751
1752 /**
1753  * register_sysctl_table - register a sysctl table hierarchy
1754  * @table: the top-level table structure
1755  *
1756  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1757  * array. A completely 0 filled entry terminates the table.
1758  *
1759  * See register_sysctl_paths for more details.
1760  */
1761 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1762 {
1763         static const struct ctl_path null_path[] = { {} };
1764
1765         return register_sysctl_paths(null_path, table);
1766 }
1767
1768 /**
1769  * unregister_sysctl_table - unregister a sysctl table hierarchy
1770  * @header: the header returned from register_sysctl_table
1771  *
1772  * Unregisters the sysctl table and all children. proc entries may not
1773  * actually be removed until they are no longer used by anyone.
1774  */
1775 void unregister_sysctl_table(struct ctl_table_header * header)
1776 {
1777         might_sleep();
1778
1779         if (header == NULL)
1780                 return;
1781
1782         spin_lock(&sysctl_lock);
1783         start_unregistering(header);
1784         spin_unlock(&sysctl_lock);
1785         kfree(header);
1786 }
1787
1788 #else /* !CONFIG_SYSCTL */
1789 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1790 {
1791         return NULL;
1792 }
1793
1794 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1795                                                     struct ctl_table *table)
1796 {
1797         return NULL;
1798 }
1799
1800 void unregister_sysctl_table(struct ctl_table_header * table)
1801 {
1802 }
1803
1804 #endif /* CONFIG_SYSCTL */
1805
1806 /*
1807  * /proc/sys support
1808  */
1809
1810 #ifdef CONFIG_PROC_SYSCTL
1811
1812 static int _proc_do_string(void* data, int maxlen, int write,
1813                            struct file *filp, void __user *buffer,
1814                            size_t *lenp, loff_t *ppos)
1815 {
1816         size_t len;
1817         char __user *p;
1818         char c;
1819
1820         if (!data || !maxlen || !*lenp) {
1821                 *lenp = 0;
1822                 return 0;
1823         }
1824
1825         if (write) {
1826                 len = 0;
1827                 p = buffer;
1828                 while (len < *lenp) {
1829                         if (get_user(c, p++))
1830                                 return -EFAULT;
1831                         if (c == 0 || c == '\n')
1832                                 break;
1833                         len++;
1834                 }
1835                 if (len >= maxlen)
1836                         len = maxlen-1;
1837                 if(copy_from_user(data, buffer, len))
1838                         return -EFAULT;
1839                 ((char *) data)[len] = 0;
1840                 *ppos += *lenp;
1841         } else {
1842                 len = strlen(data);
1843                 if (len > maxlen)
1844                         len = maxlen;
1845
1846                 if (*ppos > len) {
1847                         *lenp = 0;
1848                         return 0;
1849                 }
1850
1851                 data += *ppos;
1852                 len  -= *ppos;
1853
1854                 if (len > *lenp)
1855                         len = *lenp;
1856                 if (len)
1857                         if(copy_to_user(buffer, data, len))
1858                                 return -EFAULT;
1859                 if (len < *lenp) {
1860                         if(put_user('\n', ((char __user *) buffer) + len))
1861                                 return -EFAULT;
1862                         len++;
1863                 }
1864                 *lenp = len;
1865                 *ppos += len;
1866         }
1867         return 0;
1868 }
1869
1870 /**
1871  * proc_dostring - read a string sysctl
1872  * @table: the sysctl table
1873  * @write: %TRUE if this is a write to the sysctl file
1874  * @filp: the file structure
1875  * @buffer: the user buffer
1876  * @lenp: the size of the user buffer
1877  * @ppos: file position
1878  *
1879  * Reads/writes a string from/to the user buffer. If the kernel
1880  * buffer provided is not large enough to hold the string, the
1881  * string is truncated. The copied string is %NULL-terminated.
1882  * If the string is being read by the user process, it is copied
1883  * and a newline '\n' is added. It is truncated if the buffer is
1884  * not large enough.
1885  *
1886  * Returns 0 on success.
1887  */
1888 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1889                   void __user *buffer, size_t *lenp, loff_t *ppos)
1890 {
1891         return _proc_do_string(table->data, table->maxlen, write, filp,
1892                                buffer, lenp, ppos);
1893 }
1894
1895
1896 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1897                                  int *valp,
1898                                  int write, void *data)
1899 {
1900         if (write) {
1901                 *valp = *negp ? -*lvalp : *lvalp;
1902         } else {
1903                 int val = *valp;
1904                 if (val < 0) {
1905                         *negp = -1;
1906                         *lvalp = (unsigned long)-val;
1907                 } else {
1908                         *negp = 0;
1909                         *lvalp = (unsigned long)val;
1910                 }
1911         }
1912         return 0;
1913 }
1914
1915 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1916                   int write, struct file *filp, void __user *buffer,
1917                   size_t *lenp, loff_t *ppos,
1918                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1919                               int write, void *data),
1920                   void *data)
1921 {
1922 #define TMPBUFLEN 21
1923         int *i, vleft, first=1, neg, val;
1924         unsigned long lval;
1925         size_t left, len;
1926
1927         char buf[TMPBUFLEN], *p;
1928         char __user *s = buffer;
1929
1930         if (!tbl_data || !table->maxlen || !*lenp ||
1931             (*ppos && !write)) {
1932                 *lenp = 0;
1933                 return 0;
1934         }
1935
1936         i = (int *) tbl_data;
1937         vleft = table->maxlen / sizeof(*i);
1938         left = *lenp;
1939
1940         if (!conv)
1941                 conv = do_proc_dointvec_conv;
1942
1943         for (; left && vleft--; i++, first=0) {
1944                 if (write) {
1945                         while (left) {
1946                                 char c;
1947                                 if (get_user(c, s))
1948                                         return -EFAULT;
1949                                 if (!isspace(c))
1950                                         break;
1951                                 left--;
1952                                 s++;
1953                         }
1954                         if (!left)
1955                                 break;
1956                         neg = 0;
1957                         len = left;
1958                         if (len > sizeof(buf) - 1)
1959                                 len = sizeof(buf) - 1;
1960                         if (copy_from_user(buf, s, len))
1961                                 return -EFAULT;
1962                         buf[len] = 0;
1963                         p = buf;
1964                         if (*p == '-' && left > 1) {
1965                                 neg = 1;
1966                                 p++;
1967                         }
1968                         if (*p < '0' || *p > '9')
1969                                 break;
1970
1971                         lval = simple_strtoul(p, &p, 0);
1972
1973                         len = p-buf;
1974                         if ((len < left) && *p && !isspace(*p))
1975                                 break;
1976                         if (neg)
1977                                 val = -val;
1978                         s += len;
1979                         left -= len;
1980
1981                         if (conv(&neg, &lval, i, 1, data))
1982                                 break;
1983                 } else {
1984                         p = buf;
1985                         if (!first)
1986                                 *p++ = '\t';
1987
1988                         if (conv(&neg, &lval, i, 0, data))
1989                                 break;
1990
1991                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1992                         len = strlen(buf);
1993                         if (len > left)
1994                                 len = left;
1995                         if(copy_to_user(s, buf, len))
1996                                 return -EFAULT;
1997                         left -= len;
1998                         s += len;
1999                 }
2000         }
2001
2002         if (!write && !first && left) {
2003                 if(put_user('\n', s))
2004                         return -EFAULT;
2005                 left--, s++;
2006         }
2007         if (write) {
2008                 while (left) {
2009                         char c;
2010                         if (get_user(c, s++))
2011                                 return -EFAULT;
2012                         if (!isspace(c))
2013                                 break;
2014                         left--;
2015                 }
2016         }
2017         if (write && first)
2018                 return -EINVAL;
2019         *lenp -= left;
2020         *ppos += *lenp;
2021         return 0;
2022 #undef TMPBUFLEN
2023 }
2024
2025 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2026                   void __user *buffer, size_t *lenp, loff_t *ppos,
2027                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2028                               int write, void *data),
2029                   void *data)
2030 {
2031         return __do_proc_dointvec(table->data, table, write, filp,
2032                         buffer, lenp, ppos, conv, data);
2033 }
2034
2035 /**
2036  * proc_dointvec - read a vector of integers
2037  * @table: the sysctl table
2038  * @write: %TRUE if this is a write to the sysctl file
2039  * @filp: the file structure
2040  * @buffer: the user buffer
2041  * @lenp: the size of the user buffer
2042  * @ppos: file position
2043  *
2044  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2045  * values from/to the user buffer, treated as an ASCII string.
2046  *
2047  * Returns 0 on success.
2048  */
2049 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2050                      void __user *buffer, size_t *lenp, loff_t *ppos)
2051 {
2052     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2053                             NULL,NULL);
2054 }
2055
2056 #define OP_SET  0
2057 #define OP_AND  1
2058 #define OP_OR   2
2059
2060 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2061                                       int *valp,
2062                                       int write, void *data)
2063 {
2064         int op = *(int *)data;
2065         if (write) {
2066                 int val = *negp ? -*lvalp : *lvalp;
2067                 switch(op) {
2068                 case OP_SET:    *valp = val; break;
2069                 case OP_AND:    *valp &= val; break;
2070                 case OP_OR:     *valp |= val; break;
2071                 }
2072         } else {
2073                 int val = *valp;
2074                 if (val < 0) {
2075                         *negp = -1;
2076                         *lvalp = (unsigned long)-val;
2077                 } else {
2078                         *negp = 0;
2079                         *lvalp = (unsigned long)val;
2080                 }
2081         }
2082         return 0;
2083 }
2084
2085 #ifdef CONFIG_SECURITY_CAPABILITIES
2086 /*
2087  *      init may raise the set.
2088  */
2089
2090 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2091                         void __user *buffer, size_t *lenp, loff_t *ppos)
2092 {
2093         int op;
2094
2095         if (write && !capable(CAP_SYS_MODULE)) {
2096                 return -EPERM;
2097         }
2098
2099         op = is_global_init(current) ? OP_SET : OP_AND;
2100         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2101                                 do_proc_dointvec_bset_conv,&op);
2102 }
2103 #endif /* def CONFIG_SECURITY_CAPABILITIES */
2104
2105 /*
2106  *      Taint values can only be increased
2107  */
2108 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2109                                void __user *buffer, size_t *lenp, loff_t *ppos)
2110 {
2111         int op;
2112
2113         if (write && !capable(CAP_SYS_ADMIN))
2114                 return -EPERM;
2115
2116         op = OP_OR;
2117         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2118                                 do_proc_dointvec_bset_conv,&op);
2119 }
2120
2121 struct do_proc_dointvec_minmax_conv_param {
2122         int *min;
2123         int *max;
2124 };
2125
2126 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2127                                         int *valp,
2128                                         int write, void *data)
2129 {
2130         struct do_proc_dointvec_minmax_conv_param *param = data;
2131         if (write) {
2132                 int val = *negp ? -*lvalp : *lvalp;
2133                 if ((param->min && *param->min > val) ||
2134                     (param->max && *param->max < val))
2135                         return -EINVAL;
2136                 *valp = val;
2137         } else {
2138                 int val = *valp;
2139                 if (val < 0) {
2140                         *negp = -1;
2141                         *lvalp = (unsigned long)-val;
2142                 } else {
2143                         *negp = 0;
2144                         *lvalp = (unsigned long)val;
2145                 }
2146         }
2147         return 0;
2148 }
2149
2150 /**
2151  * proc_dointvec_minmax - read a vector of integers with min/max values
2152  * @table: the sysctl table
2153  * @write: %TRUE if this is a write to the sysctl file
2154  * @filp: the file structure
2155  * @buffer: the user buffer
2156  * @lenp: the size of the user buffer
2157  * @ppos: file position
2158  *
2159  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2160  * values from/to the user buffer, treated as an ASCII string.
2161  *
2162  * This routine will ensure the values are within the range specified by
2163  * table->extra1 (min) and table->extra2 (max).
2164  *
2165  * Returns 0 on success.
2166  */
2167 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2168                   void __user *buffer, size_t *lenp, loff_t *ppos)
2169 {
2170         struct do_proc_dointvec_minmax_conv_param param = {
2171                 .min = (int *) table->extra1,
2172                 .max = (int *) table->extra2,
2173         };
2174         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2175                                 do_proc_dointvec_minmax_conv, &param);
2176 }
2177
2178 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2179                                      struct file *filp,
2180                                      void __user *buffer,
2181                                      size_t *lenp, loff_t *ppos,
2182                                      unsigned long convmul,
2183                                      unsigned long convdiv)
2184 {
2185 #define TMPBUFLEN 21
2186         unsigned long *i, *min, *max, val;
2187         int vleft, first=1, neg;
2188         size_t len, left;
2189         char buf[TMPBUFLEN], *p;
2190         char __user *s = buffer;
2191
2192         if (!data || !table->maxlen || !*lenp ||
2193             (*ppos && !write)) {
2194                 *lenp = 0;
2195                 return 0;
2196         }
2197
2198         i = (unsigned long *) data;
2199         min = (unsigned long *) table->extra1;
2200         max = (unsigned long *) table->extra2;
2201         vleft = table->maxlen / sizeof(unsigned long);
2202         left = *lenp;
2203
2204         for (; left && vleft--; i++, min++, max++, first=0) {
2205                 if (write) {
2206                         while (left) {
2207                                 char c;
2208                                 if (get_user(c, s))
2209                                         return -EFAULT;
2210                                 if (!isspace(c))
2211                                         break;
2212                                 left--;
2213                                 s++;
2214                         }
2215                         if (!left)
2216                                 break;
2217                         neg = 0;
2218                         len = left;
2219                         if (len > TMPBUFLEN-1)
2220                                 len = TMPBUFLEN-1;
2221                         if (copy_from_user(buf, s, len))
2222                                 return -EFAULT;
2223                         buf[len] = 0;
2224                         p = buf;
2225                         if (*p == '-' && left > 1) {
2226                                 neg = 1;
2227                                 p++;
2228                         }
2229                         if (*p < '0' || *p > '9')
2230                                 break;
2231                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2232                         len = p-buf;
2233                         if ((len < left) && *p && !isspace(*p))
2234                                 break;
2235                         if (neg)
2236                                 val = -val;
2237                         s += len;
2238                         left -= len;
2239
2240                         if(neg)
2241                                 continue;
2242                         if ((min && val < *min) || (max && val > *max))
2243                                 continue;
2244                         *i = val;
2245                 } else {
2246                         p = buf;
2247                         if (!first)
2248                                 *p++ = '\t';
2249                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2250                         len = strlen(buf);
2251                         if (len > left)
2252                                 len = left;
2253                         if(copy_to_user(s, buf, len))
2254                                 return -EFAULT;
2255                         left -= len;
2256                         s += len;
2257                 }
2258         }
2259
2260         if (!write && !first && left) {
2261                 if(put_user('\n', s))
2262                         return -EFAULT;
2263                 left--, s++;
2264         }
2265         if (write) {
2266                 while (left) {
2267                         char c;
2268                         if (get_user(c, s++))
2269                                 return -EFAULT;
2270                         if (!isspace(c))
2271                                 break;
2272                         left--;
2273                 }
2274         }
2275         if (write && first)
2276                 return -EINVAL;
2277         *lenp -= left;
2278         *ppos += *lenp;
2279         return 0;
2280 #undef TMPBUFLEN
2281 }
2282
2283 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2284                                      struct file *filp,
2285                                      void __user *buffer,
2286                                      size_t *lenp, loff_t *ppos,
2287                                      unsigned long convmul,
2288                                      unsigned long convdiv)
2289 {
2290         return __do_proc_doulongvec_minmax(table->data, table, write,
2291                         filp, buffer, lenp, ppos, convmul, convdiv);
2292 }
2293
2294 /**
2295  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2296  * @table: the sysctl table
2297  * @write: %TRUE if this is a write to the sysctl file
2298  * @filp: the file structure
2299  * @buffer: the user buffer
2300  * @lenp: the size of the user buffer
2301  * @ppos: file position
2302  *
2303  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2304  * values from/to the user buffer, treated as an ASCII string.
2305  *
2306  * This routine will ensure the values are within the range specified by
2307  * table->extra1 (min) and table->extra2 (max).
2308  *
2309  * Returns 0 on success.
2310  */
2311 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2312                            void __user *buffer, size_t *lenp, loff_t *ppos)
2313 {
2314     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2315 }
2316
2317 /**
2318  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2319  * @table: the sysctl table
2320  * @write: %TRUE if this is a write to the sysctl file
2321  * @filp: the file structure
2322  * @buffer: the user buffer
2323  * @lenp: the size of the user buffer
2324  * @ppos: file position
2325  *
2326  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2327  * values from/to the user buffer, treated as an ASCII string. The values
2328  * are treated as milliseconds, and converted to jiffies when they are stored.
2329  *
2330  * This routine will ensure the values are within the range specified by
2331  * table->extra1 (min) and table->extra2 (max).
2332  *
2333  * Returns 0 on success.
2334  */
2335 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2336                                       struct file *filp,
2337                                       void __user *buffer,
2338                                       size_t *lenp, loff_t *ppos)
2339 {
2340     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2341                                      lenp, ppos, HZ, 1000l);
2342 }
2343
2344
2345 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2346                                          int *valp,
2347                                          int write, void *data)
2348 {
2349         if (write) {
2350                 if (*lvalp > LONG_MAX / HZ)
2351                         return 1;
2352                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2353         } else {
2354                 int val = *valp;
2355                 unsigned long lval;
2356                 if (val < 0) {
2357                         *negp = -1;
2358                         lval = (unsigned long)-val;
2359                 } else {
2360                         *negp = 0;
2361                         lval = (unsigned long)val;
2362                 }
2363                 *lvalp = lval / HZ;
2364         }
2365         return 0;
2366 }
2367
2368 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2369                                                 int *valp,
2370                                                 int write, void *data)
2371 {
2372         if (write) {
2373                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2374                         return 1;
2375                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2376         } else {
2377                 int val = *valp;
2378                 unsigned long lval;
2379                 if (val < 0) {
2380                         *negp = -1;
2381                         lval = (unsigned long)-val;
2382                 } else {
2383                         *negp = 0;
2384                         lval = (unsigned long)val;
2385                 }
2386                 *lvalp = jiffies_to_clock_t(lval);
2387         }
2388         return 0;
2389 }
2390
2391 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2392                                             int *valp,
2393                                             int write, void *data)
2394 {
2395         if (write) {
2396                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2397         } else {
2398                 int val = *valp;
2399                 unsigned long lval;
2400                 if (val < 0) {
2401                         *negp = -1;
2402                         lval = (unsigned long)-val;
2403                 } else {
2404                         *negp = 0;
2405                         lval = (unsigned long)val;
2406                 }
2407                 *lvalp = jiffies_to_msecs(lval);
2408         }
2409         return 0;
2410 }
2411
2412 /**
2413  * proc_dointvec_jiffies - read a vector of integers as seconds
2414  * @table: the sysctl table
2415  * @write: %TRUE if this is a write to the sysctl file
2416  * @filp: the file structure
2417  * @buffer: the user buffer
2418  * @lenp: the size of the user buffer
2419  * @ppos: file position
2420  *
2421  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2422  * values from/to the user buffer, treated as an ASCII string.
2423  * The values read are assumed to be in seconds, and are converted into
2424  * jiffies.
2425  *
2426  * Returns 0 on success.
2427  */
2428 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2429                           void __user *buffer, size_t *lenp, loff_t *ppos)
2430 {
2431     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2432                             do_proc_dointvec_jiffies_conv,NULL);
2433 }
2434
2435 /**
2436  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2437  * @table: the sysctl table
2438  * @write: %TRUE if this is a write to the sysctl file
2439  * @filp: the file structure
2440  * @buffer: the user buffer
2441  * @lenp: the size of the user buffer
2442  * @ppos: pointer to the file position
2443  *
2444  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2445  * values from/to the user buffer, treated as an ASCII string.
2446  * The values read are assumed to be in 1/USER_HZ seconds, and
2447  * are converted into jiffies.
2448  *
2449  * Returns 0 on success.
2450  */
2451 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2452                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2453 {
2454     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2455                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2456 }
2457
2458 /**
2459  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2460  * @table: the sysctl table
2461  * @write: %TRUE if this is a write to the sysctl file
2462  * @filp: the file structure
2463  * @buffer: the user buffer
2464  * @lenp: the size of the user buffer
2465  * @ppos: file position
2466  * @ppos: the current position in the file
2467  *
2468  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2469  * values from/to the user buffer, treated as an ASCII string.
2470  * The values read are assumed to be in 1/1000 seconds, and
2471  * are converted into jiffies.
2472  *
2473  * Returns 0 on success.
2474  */
2475 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2476                              void __user *buffer, size_t *lenp, loff_t *ppos)
2477 {
2478         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2479                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2480 }
2481
2482 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2483                            void __user *buffer, size_t *lenp, loff_t *ppos)
2484 {
2485         struct pid *new_pid;
2486         pid_t tmp;
2487         int r;
2488
2489         tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
2490
2491         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2492                                lenp, ppos, NULL, NULL);
2493         if (r || !write)
2494                 return r;
2495
2496         new_pid = find_get_pid(tmp);
2497         if (!new_pid)
2498                 return -ESRCH;
2499
2500         put_pid(xchg(&cad_pid, new_pid));
2501         return 0;
2502 }
2503
2504 #else /* CONFIG_PROC_FS */
2505
2506 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2507                   void __user *buffer, size_t *lenp, loff_t *ppos)
2508 {
2509         return -ENOSYS;
2510 }
2511
2512 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2513                   void __user *buffer, size_t *lenp, loff_t *ppos)
2514 {
2515         return -ENOSYS;
2516 }
2517
2518 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2519                         void __user *buffer, size_t *lenp, loff_t *ppos)
2520 {
2521         return -ENOSYS;
2522 }
2523
2524 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2525                     void __user *buffer, size_t *lenp, loff_t *ppos)
2526 {
2527         return -ENOSYS;
2528 }
2529
2530 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2531                     void __user *buffer, size_t *lenp, loff_t *ppos)
2532 {
2533         return -ENOSYS;
2534 }
2535
2536 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2537                     void __user *buffer, size_t *lenp, loff_t *ppos)
2538 {
2539         return -ENOSYS;
2540 }
2541
2542 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2543                              void __user *buffer, size_t *lenp, loff_t *ppos)
2544 {
2545         return -ENOSYS;
2546 }
2547
2548 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2549                     void __user *buffer, size_t *lenp, loff_t *ppos)
2550 {
2551         return -ENOSYS;
2552 }
2553
2554 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2555                                       struct file *filp,
2556                                       void __user *buffer,
2557                                       size_t *lenp, loff_t *ppos)
2558 {
2559     return -ENOSYS;
2560 }
2561
2562
2563 #endif /* CONFIG_PROC_FS */
2564
2565
2566 #ifdef CONFIG_SYSCTL_SYSCALL
2567 /*
2568  * General sysctl support routines
2569  */
2570
2571 /* The generic sysctl data routine (used if no strategy routine supplied) */
2572 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2573                 void __user *oldval, size_t __user *oldlenp,
2574                 void __user *newval, size_t newlen)
2575 {
2576         size_t len;
2577
2578         /* Get out of I don't have a variable */
2579         if (!table->data || !table->maxlen)
2580                 return -ENOTDIR;
2581
2582         if (oldval && oldlenp) {
2583                 if (get_user(len, oldlenp))
2584                         return -EFAULT;
2585                 if (len) {
2586                         if (len > table->maxlen)
2587                                 len = table->maxlen;
2588                         if (copy_to_user(oldval, table->data, len))
2589                                 return -EFAULT;
2590                         if (put_user(len, oldlenp))
2591                                 return -EFAULT;
2592                 }
2593         }
2594
2595         if (newval && newlen) {
2596                 if (newlen > table->maxlen)
2597                         newlen = table->maxlen;
2598
2599                 if (copy_from_user(table->data, newval, newlen))
2600                         return -EFAULT;
2601         }
2602         return 1;
2603 }
2604
2605 /* The generic string strategy routine: */
2606 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2607                   void __user *oldval, size_t __user *oldlenp,
2608                   void __user *newval, size_t newlen)
2609 {
2610         if (!table->data || !table->maxlen)
2611                 return -ENOTDIR;
2612
2613         if (oldval && oldlenp) {
2614                 size_t bufsize;
2615                 if (get_user(bufsize, oldlenp))
2616                         return -EFAULT;
2617                 if (bufsize) {
2618                         size_t len = strlen(table->data), copied;
2619
2620                         /* This shouldn't trigger for a well-formed sysctl */
2621                         if (len > table->maxlen)
2622                                 len = table->maxlen;
2623
2624                         /* Copy up to a max of bufsize-1 bytes of the string */
2625                         copied = (len >= bufsize) ? bufsize - 1 : len;
2626
2627                         if (copy_to_user(oldval, table->data, copied) ||
2628                             put_user(0, (char __user *)(oldval + copied)))
2629                                 return -EFAULT;
2630                         if (put_user(len, oldlenp))
2631                                 return -EFAULT;
2632                 }
2633         }
2634         if (newval && newlen) {
2635                 size_t len = newlen;
2636                 if (len > table->maxlen)
2637                         len = table->maxlen;
2638                 if(copy_from_user(table->data, newval, len))
2639                         return -EFAULT;
2640                 if (len == table->maxlen)
2641                         len--;
2642                 ((char *) table->data)[len] = 0;
2643         }
2644         return 1;
2645 }
2646
2647 /*
2648  * This function makes sure that all of the integers in the vector
2649  * are between the minimum and maximum values given in the arrays
2650  * table->extra1 and table->extra2, respectively.
2651  */
2652 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2653                 void __user *oldval, size_t __user *oldlenp,
2654                 void __user *newval, size_t newlen)
2655 {
2656
2657         if (newval && newlen) {
2658                 int __user *vec = (int __user *) newval;
2659                 int *min = (int *) table->extra1;
2660                 int *max = (int *) table->extra2;
2661                 size_t length;
2662                 int i;
2663
2664                 if (newlen % sizeof(int) != 0)
2665                         return -EINVAL;
2666
2667                 if (!table->extra1 && !table->extra2)
2668                         return 0;
2669
2670                 if (newlen > table->maxlen)
2671                         newlen = table->maxlen;
2672                 length = newlen / sizeof(int);
2673
2674                 for (i = 0; i < length; i++) {
2675                         int value;
2676                         if (get_user(value, vec + i))
2677                                 return -EFAULT;
2678                         if (min && value < min[i])
2679                                 return -EINVAL;
2680                         if (max && value > max[i])
2681                                 return -EINVAL;
2682                 }
2683         }
2684         return 0;
2685 }
2686
2687 /* Strategy function to convert jiffies to seconds */
2688 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2689                 void __user *oldval, size_t __user *oldlenp,
2690                 void __user *newval, size_t newlen)
2691 {
2692         if (oldval && oldlenp) {
2693                 size_t olen;
2694
2695                 if (get_user(olen, oldlenp))
2696                         return -EFAULT;
2697                 if (olen) {
2698                         int val;
2699
2700                         if (olen < sizeof(int))
2701                                 return -EINVAL;
2702
2703                         val = *(int *)(table->data) / HZ;
2704                         if (put_user(val, (int __user *)oldval))
2705                                 return -EFAULT;
2706                         if (put_user(sizeof(int), oldlenp))
2707                                 return -EFAULT;
2708                 }
2709         }
2710         if (newval && newlen) {
2711                 int new;
2712                 if (newlen != sizeof(int))
2713                         return -EINVAL;
2714                 if (get_user(new, (int __user *)newval))
2715                         return -EFAULT;
2716                 *(int *)(table->data) = new*HZ;
2717         }
2718         return 1;
2719 }
2720
2721 /* Strategy function to convert jiffies to seconds */
2722 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2723                 void __user *oldval, size_t __user *oldlenp,
2724                 void __user *newval, size_t newlen)
2725 {
2726         if (oldval && oldlenp) {
2727                 size_t olen;
2728
2729                 if (get_user(olen, oldlenp))
2730                         return -EFAULT;
2731                 if (olen) {
2732                         int val;
2733
2734                         if (olen < sizeof(int))
2735                                 return -EINVAL;
2736
2737                         val = jiffies_to_msecs(*(int *)(table->data));
2738                         if (put_user(val, (int __user *)oldval))
2739                                 return -EFAULT;
2740                         if (put_user(sizeof(int), oldlenp))
2741                                 return -EFAULT;
2742                 }
2743         }
2744         if (newval && newlen) {
2745                 int new;
2746                 if (newlen != sizeof(int))
2747                         return -EINVAL;
2748                 if (get_user(new, (int __user *)newval))
2749                         return -EFAULT;
2750                 *(int *)(table->data) = msecs_to_jiffies(new);
2751         }
2752         return 1;
2753 }
2754
2755
2756
2757 #else /* CONFIG_SYSCTL_SYSCALL */
2758
2759
2760 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2761 {
2762         struct __sysctl_args tmp;
2763         int error;
2764
2765         if (copy_from_user(&tmp, args, sizeof(tmp)))
2766                 return -EFAULT;
2767
2768         error = deprecated_sysctl_warning(&tmp);
2769
2770         /* If no error reading the parameters then just -ENOSYS ... */
2771         if (!error)
2772                 error = -ENOSYS;
2773
2774         return error;
2775 }
2776
2777 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2778                   void __user *oldval, size_t __user *oldlenp,
2779                   void __user *newval, size_t newlen)
2780 {
2781         return -ENOSYS;
2782 }
2783
2784 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2785                   void __user *oldval, size_t __user *oldlenp,
2786                   void __user *newval, size_t newlen)
2787 {
2788         return -ENOSYS;
2789 }
2790
2791 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2792                 void __user *oldval, size_t __user *oldlenp,
2793                 void __user *newval, size_t newlen)
2794 {
2795         return -ENOSYS;
2796 }
2797
2798 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2799                 void __user *oldval, size_t __user *oldlenp,
2800                 void __user *newval, size_t newlen)
2801 {
2802         return -ENOSYS;
2803 }
2804
2805 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2806                 void __user *oldval, size_t __user *oldlenp,
2807                 void __user *newval, size_t newlen)
2808 {
2809         return -ENOSYS;
2810 }
2811
2812 #endif /* CONFIG_SYSCTL_SYSCALL */
2813
2814 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2815 {
2816         static int msg_count;
2817         int name[CTL_MAXNAME];
2818         int i;
2819
2820         /* Check args->nlen. */
2821         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2822                 return -ENOTDIR;
2823
2824         /* Read in the sysctl name for better debug message logging */
2825         for (i = 0; i < args->nlen; i++)
2826                 if (get_user(name[i], args->name + i))
2827                         return -EFAULT;
2828
2829         /* Ignore accesses to kernel.version */
2830         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2831                 return 0;
2832
2833         if (msg_count < 5) {
2834                 msg_count++;
2835                 printk(KERN_INFO
2836                         "warning: process `%s' used the deprecated sysctl "
2837                         "system call with ", current->comm);
2838                 for (i = 0; i < args->nlen; i++)
2839                         printk("%d.", name[i]);
2840                 printk("\n");
2841         }
2842         return 0;
2843 }
2844
2845 /*
2846  * No sense putting this after each symbol definition, twice,
2847  * exception granted :-)
2848  */
2849 EXPORT_SYMBOL(proc_dointvec);
2850 EXPORT_SYMBOL(proc_dointvec_jiffies);
2851 EXPORT_SYMBOL(proc_dointvec_minmax);
2852 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2853 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2854 EXPORT_SYMBOL(proc_dostring);
2855 EXPORT_SYMBOL(proc_doulongvec_minmax);
2856 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2857 EXPORT_SYMBOL(register_sysctl_table);
2858 EXPORT_SYMBOL(register_sysctl_paths);
2859 EXPORT_SYMBOL(sysctl_intvec);
2860 EXPORT_SYMBOL(sysctl_jiffies);
2861 EXPORT_SYMBOL(sysctl_ms_jiffies);
2862 EXPORT_SYMBOL(sysctl_string);
2863 EXPORT_SYMBOL(sysctl_data);
2864 EXPORT_SYMBOL(unregister_sysctl_table);