SAFE public projects git trees. - safe/jmp/linux-2.6/blob - kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/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_header root_table_header =
 161         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 162
 163 static struct ctl_table kern_table[];
 164 static struct ctl_table vm_table[];
 165 static struct ctl_table fs_table[];
 166 static struct ctl_table debug_table[];
 167 static struct ctl_table dev_table[];
 168 extern struct ctl_table random_table[];
 169 #ifdef CONFIG_INOTIFY_USER
 170 extern struct ctl_table inotify_table[];
 171 #endif
 172
 173 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 174 int sysctl_legacy_va_layout;
 175 #endif
 176
 177 extern int prove_locking;
 178 extern int lock_stat;
 179
 180 /* The default sysctl tables: */
 181
 182 static struct ctl_table root_table[] = {
 183         {
 184                 .ctl_name       = CTL_KERN,
 185                 .procname       = "kernel",
 186                 .mode           = 0555,
 187                 .child          = kern_table,
 188         },
 189         {
 190                 .ctl_name       = CTL_VM,
 191                 .procname       = "vm",
 192                 .mode           = 0555,
 193                 .child          = vm_table,
 194         },
 195 #ifdef CONFIG_NET
 196         {
 197                 .ctl_name       = CTL_NET,
 198                 .procname       = "net",
 199                 .mode           = 0555,
 200                 .child          = net_table,
 201         },
 202 #endif
 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 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1375 {
1376         struct ctl_table_header *head;
1377         struct list_head *tmp;
1378         spin_lock(&sysctl_lock);
1379         if (prev) {
1380                 tmp = &prev->ctl_entry;
1381                 unuse_table(prev);
1382                 goto next;
1383         }
1384         tmp = &root_table_header.ctl_entry;
1385         for (;;) {
1386                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1387
1388                 if (!use_table(head))
1389                         goto next;
1390                 spin_unlock(&sysctl_lock);
1391                 return head;
1392         next:
1393                 tmp = tmp->next;
1394                 if (tmp == &root_table_header.ctl_entry)
1395                         break;
1396         }
1397         spin_unlock(&sysctl_lock);
1398         return NULL;
1399 }
1400
1401 #ifdef CONFIG_SYSCTL_SYSCALL
1402 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1403                void __user *newval, size_t newlen)
1404 {
1405         struct ctl_table_header *head;
1406         int error = -ENOTDIR;
1407
1408         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1409                 return -ENOTDIR;
1410         if (oldval) {
1411                 int old_len;
1412                 if (!oldlenp || get_user(old_len, oldlenp))
1413                         return -EFAULT;
1414         }
1415
1416         for (head = sysctl_head_next(NULL); head;
1417                         head = sysctl_head_next(head)) {
1418                 error = parse_table(name, nlen, oldval, oldlenp,
1419                                         newval, newlen, head->ctl_table);
1420                 if (error != -ENOTDIR) {
1421                         sysctl_head_finish(head);
1422                         break;
1423                 }
1424         }
1425         return error;
1426 }
1427
1428 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1429 {
1430         struct __sysctl_args tmp;
1431         int error;
1432
1433         if (copy_from_user(&tmp, args, sizeof(tmp)))
1434                 return -EFAULT;
1435
1436         error = deprecated_sysctl_warning(&tmp);
1437         if (error)
1438                 goto out;
1439
1440         lock_kernel();
1441         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1442                           tmp.newval, tmp.newlen);
1443         unlock_kernel();
1444 out:
1445         return error;
1446 }
1447 #endif /* CONFIG_SYSCTL_SYSCALL */
1448
1449 /*
1450  * sysctl_perm does NOT grant the superuser all rights automatically, because
1451  * some sysctl variables are readonly even to root.
1452  */
1453
1454 static int test_perm(int mode, int op)
1455 {
1456         if (!current->euid)
1457                 mode >>= 6;
1458         else if (in_egroup_p(0))
1459                 mode >>= 3;
1460         if ((mode & op & 0007) == op)
1461                 return 0;
1462         return -EACCES;
1463 }
1464
1465 int sysctl_perm(struct ctl_table *table, int op)
1466 {
1467         int error;
1468         error = security_sysctl(table, op);
1469         if (error)
1470                 return error;
1471         return test_perm(table->mode, op);
1472 }
1473
1474 #ifdef CONFIG_SYSCTL_SYSCALL
1475 static int parse_table(int __user *name, int nlen,
1476                        void __user *oldval, size_t __user *oldlenp,
1477                        void __user *newval, size_t newlen,
1478                        struct ctl_table *table)
1479 {
1480         int n;
1481 repeat:
1482         if (!nlen)
1483                 return -ENOTDIR;
1484         if (get_user(n, name))
1485                 return -EFAULT;
1486         for ( ; table->ctl_name || table->procname; table++) {
1487                 if (!table->ctl_name)
1488                         continue;
1489                 if (n == table->ctl_name) {
1490                         int error;
1491                         if (table->child) {
1492                                 if (sysctl_perm(table, 001))
1493                                         return -EPERM;
1494                                 name++;
1495                                 nlen--;
1496                                 table = table->child;
1497                                 goto repeat;
1498                         }
1499                         error = do_sysctl_strategy(table, name, nlen,
1500                                                    oldval, oldlenp,
1501                                                    newval, newlen);
1502                         return error;
1503                 }
1504         }
1505         return -ENOTDIR;
1506 }
1507
1508 /* Perform the actual read/write of a sysctl table entry. */
1509 int do_sysctl_strategy (struct ctl_table *table,
1510                         int __user *name, int nlen,
1511                         void __user *oldval, size_t __user *oldlenp,
1512                         void __user *newval, size_t newlen)
1513 {
1514         int op = 0, rc;
1515
1516         if (oldval)
1517                 op |= 004;
1518         if (newval)
1519                 op |= 002;
1520         if (sysctl_perm(table, op))
1521                 return -EPERM;
1522
1523         if (table->strategy) {
1524                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1525                                      newval, newlen);
1526                 if (rc < 0)
1527                         return rc;
1528                 if (rc > 0)
1529                         return 0;
1530         }
1531
1532         /* If there is no strategy routine, or if the strategy returns
1533          * zero, proceed with automatic r/w */
1534         if (table->data && table->maxlen) {
1535                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1536                                  newval, newlen);
1537                 if (rc < 0)
1538                         return rc;
1539         }
1540         return 0;
1541 }
1542 #endif /* CONFIG_SYSCTL_SYSCALL */
1543
1544 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1545 {
1546         for (; table->ctl_name || table->procname; table++) {
1547                 table->parent = parent;
1548                 if (table->child)
1549                         sysctl_set_parent(table, table->child);
1550         }
1551 }
1552
1553 static __init int sysctl_init(void)
1554 {
1555         int err;
1556         sysctl_set_parent(NULL, root_table);
1557         err = sysctl_check_table(root_table);
1558         return 0;
1559 }
1560
1561 core_initcall(sysctl_init);
1562
1563 /**
1564  * register_sysctl_paths - register a sysctl hierarchy
1565  * @path: The path to the directory the sysctl table is in.
1566  * @table: the top-level table structure
1567  *
1568  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1569  * array. A completely 0 filled entry terminates the table.
1570  *
1571  * The members of the &struct ctl_table structure are used as follows:
1572  *
1573  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1574  *            must be unique within that level of sysctl
1575  *
1576  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1577  *            enter a sysctl file
1578  *
1579  * data - a pointer to data for use by proc_handler
1580  *
1581  * maxlen - the maximum size in bytes of the data
1582  *
1583  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1584  *
1585  * child - a pointer to the child sysctl table if this entry is a directory, or
1586  *         %NULL.
1587  *
1588  * proc_handler - the text handler routine (described below)
1589  *
1590  * strategy - the strategy routine (described below)
1591  *
1592  * de - for internal use by the sysctl routines
1593  *
1594  * extra1, extra2 - extra pointers usable by the proc handler routines
1595  *
1596  * Leaf nodes in the sysctl tree will be represented by a single file
1597  * under /proc; non-leaf nodes will be represented by directories.
1598  *
1599  * sysctl(2) can automatically manage read and write requests through
1600  * the sysctl table.  The data and maxlen fields of the ctl_table
1601  * struct enable minimal validation of the values being written to be
1602  * performed, and the mode field allows minimal authentication.
1603  *
1604  * More sophisticated management can be enabled by the provision of a
1605  * strategy routine with the table entry.  This will be called before
1606  * any automatic read or write of the data is performed.
1607  *
1608  * The strategy routine may return
1609  *
1610  * < 0 - Error occurred (error is passed to user process)
1611  *
1612  * 0   - OK - proceed with automatic read or write.
1613  *
1614  * > 0 - OK - read or write has been done by the strategy routine, so
1615  *       return immediately.
1616  *
1617  * There must be a proc_handler routine for any terminal nodes
1618  * mirrored under /proc/sys (non-terminals are handled by a built-in
1619  * directory handler).  Several default handlers are available to
1620  * cover common cases -
1621  *
1622  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1623  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1624  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1625  *
1626  * It is the handler's job to read the input buffer from user memory
1627  * and process it. The handler should return 0 on success.
1628  *
1629  * This routine returns %NULL on a failure to register, and a pointer
1630  * to the table header on success.
1631  */
1632 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1633                                                 struct ctl_table *table)
1634 {
1635         struct ctl_table_header *header;
1636         struct ctl_table *new, **prevp;
1637         unsigned int n, npath;
1638
1639         /* Count the path components */
1640         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1641                 ;
1642
1643         /*
1644          * For each path component, allocate a 2-element ctl_table array.
1645          * The first array element will be filled with the sysctl entry
1646          * for this, the second will be the sentinel (ctl_name == 0).
1647          *
1648          * We allocate everything in one go so that we don't have to
1649          * worry about freeing additional memory in unregister_sysctl_table.
1650          */
1651         header = kzalloc(sizeof(struct ctl_table_header) +
1652                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1653         if (!header)
1654                 return NULL;
1655
1656         new = (struct ctl_table *) (header + 1);
1657
1658         /* Now connect the dots */
1659         prevp = &header->ctl_table;
1660         for (n = 0; n < npath; ++n, ++path) {
1661                 /* Copy the procname */
1662                 new->procname = path->procname;
1663                 new->ctl_name = path->ctl_name;
1664                 new->mode     = 0555;
1665
1666                 *prevp = new;
1667                 prevp = &new->child;
1668
1669                 new += 2;
1670         }
1671         *prevp = table;
1672         header->ctl_table_arg = table;
1673
1674         INIT_LIST_HEAD(&header->ctl_entry);
1675         header->used = 0;
1676         header->unregistering = NULL;
1677         sysctl_set_parent(NULL, header->ctl_table);
1678         if (sysctl_check_table(header->ctl_table)) {
1679                 kfree(header);
1680                 return NULL;
1681         }
1682         spin_lock(&sysctl_lock);
1683         list_add_tail(&header->ctl_entry, &root_table_header.ctl_entry);
1684         spin_unlock(&sysctl_lock);
1685
1686         return header;
1687 }
1688
1689 /**
1690  * register_sysctl_table - register a sysctl table hierarchy
1691  * @table: the top-level table structure
1692  *
1693  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1694  * array. A completely 0 filled entry terminates the table.
1695  *
1696  * See register_sysctl_paths for more details.
1697  */
1698 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1699 {
1700         static const struct ctl_path null_path[] = { {} };
1701
1702         return register_sysctl_paths(null_path, table);
1703 }
1704
1705 /**
1706  * unregister_sysctl_table - unregister a sysctl table hierarchy
1707  * @header: the header returned from register_sysctl_table
1708  *
1709  * Unregisters the sysctl table and all children. proc entries may not
1710  * actually be removed until they are no longer used by anyone.
1711  */
1712 void unregister_sysctl_table(struct ctl_table_header * header)
1713 {
1714         might_sleep();
1715
1716         if (header == NULL)
1717                 return;
1718
1719         spin_lock(&sysctl_lock);
1720         start_unregistering(header);
1721         spin_unlock(&sysctl_lock);
1722         kfree(header);
1723 }
1724
1725 #else /* !CONFIG_SYSCTL */
1726 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1727 {
1728         return NULL;
1729 }
1730
1731 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1732                                                     struct ctl_table *table)
1733 {
1734         return NULL;
1735 }
1736
1737 void unregister_sysctl_table(struct ctl_table_header * table)
1738 {
1739 }
1740
1741 #endif /* CONFIG_SYSCTL */
1742
1743 /*
1744  * /proc/sys support
1745  */
1746
1747 #ifdef CONFIG_PROC_SYSCTL
1748
1749 static int _proc_do_string(void* data, int maxlen, int write,
1750                            struct file *filp, void __user *buffer,
1751                            size_t *lenp, loff_t *ppos)
1752 {
1753         size_t len;
1754         char __user *p;
1755         char c;
1756
1757         if (!data || !maxlen || !*lenp) {
1758                 *lenp = 0;
1759                 return 0;
1760         }
1761
1762         if (write) {
1763                 len = 0;
1764                 p = buffer;
1765                 while (len < *lenp) {
1766                         if (get_user(c, p++))
1767                                 return -EFAULT;
1768                         if (c == 0 || c == '\n')
1769                                 break;
1770                         len++;
1771                 }
1772                 if (len >= maxlen)
1773                         len = maxlen-1;
1774                 if(copy_from_user(data, buffer, len))
1775                         return -EFAULT;
1776                 ((char *) data)[len] = 0;
1777                 *ppos += *lenp;
1778         } else {
1779                 len = strlen(data);
1780                 if (len > maxlen)
1781                         len = maxlen;
1782
1783                 if (*ppos > len) {
1784                         *lenp = 0;
1785                         return 0;
1786                 }
1787
1788                 data += *ppos;
1789                 len  -= *ppos;
1790
1791                 if (len > *lenp)
1792                         len = *lenp;
1793                 if (len)
1794                         if(copy_to_user(buffer, data, len))
1795                                 return -EFAULT;
1796                 if (len < *lenp) {
1797                         if(put_user('\n', ((char __user *) buffer) + len))
1798                                 return -EFAULT;
1799                         len++;
1800                 }
1801                 *lenp = len;
1802                 *ppos += len;
1803         }
1804         return 0;
1805 }
1806
1807 /**
1808  * proc_dostring - read a string sysctl
1809  * @table: the sysctl table
1810  * @write: %TRUE if this is a write to the sysctl file
1811  * @filp: the file structure
1812  * @buffer: the user buffer
1813  * @lenp: the size of the user buffer
1814  * @ppos: file position
1815  *
1816  * Reads/writes a string from/to the user buffer. If the kernel
1817  * buffer provided is not large enough to hold the string, the
1818  * string is truncated. The copied string is %NULL-terminated.
1819  * If the string is being read by the user process, it is copied
1820  * and a newline '\n' is added. It is truncated if the buffer is
1821  * not large enough.
1822  *
1823  * Returns 0 on success.
1824  */
1825 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1826                   void __user *buffer, size_t *lenp, loff_t *ppos)
1827 {
1828         return _proc_do_string(table->data, table->maxlen, write, filp,
1829                                buffer, lenp, ppos);
1830 }
1831
1832
1833 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1834                                  int *valp,
1835                                  int write, void *data)
1836 {
1837         if (write) {
1838                 *valp = *negp ? -*lvalp : *lvalp;
1839         } else {
1840                 int val = *valp;
1841                 if (val < 0) {
1842                         *negp = -1;
1843                         *lvalp = (unsigned long)-val;
1844                 } else {
1845                         *negp = 0;
1846                         *lvalp = (unsigned long)val;
1847                 }
1848         }
1849         return 0;
1850 }
1851
1852 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1853                   int write, struct file *filp, void __user *buffer,
1854                   size_t *lenp, loff_t *ppos,
1855                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1856                               int write, void *data),
1857                   void *data)
1858 {
1859 #define TMPBUFLEN 21
1860         int *i, vleft, first=1, neg, val;
1861         unsigned long lval;
1862         size_t left, len;
1863
1864         char buf[TMPBUFLEN], *p;
1865         char __user *s = buffer;
1866
1867         if (!tbl_data || !table->maxlen || !*lenp ||
1868             (*ppos && !write)) {
1869                 *lenp = 0;
1870                 return 0;
1871         }
1872
1873         i = (int *) tbl_data;
1874         vleft = table->maxlen / sizeof(*i);
1875         left = *lenp;
1876
1877         if (!conv)
1878                 conv = do_proc_dointvec_conv;
1879
1880         for (; left && vleft--; i++, first=0) {
1881                 if (write) {
1882                         while (left) {
1883                                 char c;
1884                                 if (get_user(c, s))
1885                                         return -EFAULT;
1886                                 if (!isspace(c))
1887                                         break;
1888                                 left--;
1889                                 s++;
1890                         }
1891                         if (!left)
1892                                 break;
1893                         neg = 0;
1894                         len = left;
1895                         if (len > sizeof(buf) - 1)
1896                                 len = sizeof(buf) - 1;
1897                         if (copy_from_user(buf, s, len))
1898                                 return -EFAULT;
1899                         buf[len] = 0;
1900                         p = buf;
1901                         if (*p == '-' && left > 1) {
1902                                 neg = 1;
1903                                 p++;
1904                         }
1905                         if (*p < '0' || *p > '9')
1906                                 break;
1907
1908                         lval = simple_strtoul(p, &p, 0);
1909
1910                         len = p-buf;
1911                         if ((len < left) && *p && !isspace(*p))
1912                                 break;
1913                         if (neg)
1914                                 val = -val;
1915                         s += len;
1916                         left -= len;
1917
1918                         if (conv(&neg, &lval, i, 1, data))
1919                                 break;
1920                 } else {
1921                         p = buf;
1922                         if (!first)
1923                                 *p++ = '\t';
1924
1925                         if (conv(&neg, &lval, i, 0, data))
1926                                 break;
1927
1928                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1929                         len = strlen(buf);
1930                         if (len > left)
1931                                 len = left;
1932                         if(copy_to_user(s, buf, len))
1933                                 return -EFAULT;
1934                         left -= len;
1935                         s += len;
1936                 }
1937         }
1938
1939         if (!write && !first && left) {
1940                 if(put_user('\n', s))
1941                         return -EFAULT;
1942                 left--, s++;
1943         }
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                 }
1953         }
1954         if (write && first)
1955                 return -EINVAL;
1956         *lenp -= left;
1957         *ppos += *lenp;
1958         return 0;
1959 #undef TMPBUFLEN
1960 }
1961
1962 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1963                   void __user *buffer, size_t *lenp, loff_t *ppos,
1964                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1965                               int write, void *data),
1966                   void *data)
1967 {
1968         return __do_proc_dointvec(table->data, table, write, filp,
1969                         buffer, lenp, ppos, conv, data);
1970 }
1971
1972 /**
1973  * proc_dointvec - read a vector of integers
1974  * @table: the sysctl table
1975  * @write: %TRUE if this is a write to the sysctl file
1976  * @filp: the file structure
1977  * @buffer: the user buffer
1978  * @lenp: the size of the user buffer
1979  * @ppos: file position
1980  *
1981  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1982  * values from/to the user buffer, treated as an ASCII string.
1983  *
1984  * Returns 0 on success.
1985  */
1986 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1987                      void __user *buffer, size_t *lenp, loff_t *ppos)
1988 {
1989     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1990                             NULL,NULL);
1991 }
1992
1993 #define OP_SET  0
1994 #define OP_AND  1
1995 #define OP_OR   2
1996
1997 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1998                                       int *valp,
1999                                       int write, void *data)
2000 {
2001         int op = *(int *)data;
2002         if (write) {
2003                 int val = *negp ? -*lvalp : *lvalp;
2004                 switch(op) {
2005                 case OP_SET:    *valp = val; break;
2006                 case OP_AND:    *valp &= val; break;
2007                 case OP_OR:     *valp |= val; break;
2008                 }
2009         } else {
2010                 int val = *valp;
2011                 if (val < 0) {
2012                         *negp = -1;
2013                         *lvalp = (unsigned long)-val;
2014                 } else {
2015                         *negp = 0;
2016                         *lvalp = (unsigned long)val;
2017                 }
2018         }
2019         return 0;
2020 }
2021
2022 #ifdef CONFIG_SECURITY_CAPABILITIES
2023 /*
2024  *      init may raise the set.
2025  */
2026
2027 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2028                         void __user *buffer, size_t *lenp, loff_t *ppos)
2029 {
2030         int op;
2031
2032         if (write && !capable(CAP_SYS_MODULE)) {
2033                 return -EPERM;
2034         }
2035
2036         op = is_global_init(current) ? OP_SET : OP_AND;
2037         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2038                                 do_proc_dointvec_bset_conv,&op);
2039 }
2040 #endif /* def CONFIG_SECURITY_CAPABILITIES */
2041
2042 /*
2043  *      Taint values can only be increased
2044  */
2045 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2046                                void __user *buffer, size_t *lenp, loff_t *ppos)
2047 {
2048         int op;
2049
2050         if (write && !capable(CAP_SYS_ADMIN))
2051                 return -EPERM;
2052
2053         op = OP_OR;
2054         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2055                                 do_proc_dointvec_bset_conv,&op);
2056 }
2057
2058 struct do_proc_dointvec_minmax_conv_param {
2059         int *min;
2060         int *max;
2061 };
2062
2063 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2064                                         int *valp,
2065                                         int write, void *data)
2066 {
2067         struct do_proc_dointvec_minmax_conv_param *param = data;
2068         if (write) {
2069                 int val = *negp ? -*lvalp : *lvalp;
2070                 if ((param->min && *param->min > val) ||
2071                     (param->max && *param->max < val))
2072                         return -EINVAL;
2073                 *valp = val;
2074         } else {
2075                 int val = *valp;
2076                 if (val < 0) {
2077                         *negp = -1;
2078                         *lvalp = (unsigned long)-val;
2079                 } else {
2080                         *negp = 0;
2081                         *lvalp = (unsigned long)val;
2082                 }
2083         }
2084         return 0;
2085 }
2086
2087 /**
2088  * proc_dointvec_minmax - read a vector of integers with min/max values
2089  * @table: the sysctl table
2090  * @write: %TRUE if this is a write to the sysctl file
2091  * @filp: the file structure
2092  * @buffer: the user buffer
2093  * @lenp: the size of the user buffer
2094  * @ppos: file position
2095  *
2096  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2097  * values from/to the user buffer, treated as an ASCII string.
2098  *
2099  * This routine will ensure the values are within the range specified by
2100  * table->extra1 (min) and table->extra2 (max).
2101  *
2102  * Returns 0 on success.
2103  */
2104 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2105                   void __user *buffer, size_t *lenp, loff_t *ppos)
2106 {
2107         struct do_proc_dointvec_minmax_conv_param param = {
2108                 .min = (int *) table->extra1,
2109                 .max = (int *) table->extra2,
2110         };
2111         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2112                                 do_proc_dointvec_minmax_conv, &param);
2113 }
2114
2115 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2116                                      struct file *filp,
2117                                      void __user *buffer,
2118                                      size_t *lenp, loff_t *ppos,
2119                                      unsigned long convmul,
2120                                      unsigned long convdiv)
2121 {
2122 #define TMPBUFLEN 21
2123         unsigned long *i, *min, *max, val;
2124         int vleft, first=1, neg;
2125         size_t len, left;
2126         char buf[TMPBUFLEN], *p;
2127         char __user *s = buffer;
2128
2129         if (!data || !table->maxlen || !*lenp ||
2130             (*ppos && !write)) {
2131                 *lenp = 0;
2132                 return 0;
2133         }
2134
2135         i = (unsigned long *) data;
2136         min = (unsigned long *) table->extra1;
2137         max = (unsigned long *) table->extra2;
2138         vleft = table->maxlen / sizeof(unsigned long);
2139         left = *lenp;
2140
2141         for (; left && vleft--; i++, min++, max++, first=0) {
2142                 if (write) {
2143                         while (left) {
2144                                 char c;
2145                                 if (get_user(c, s))
2146                                         return -EFAULT;
2147                                 if (!isspace(c))
2148                                         break;
2149                                 left--;
2150                                 s++;
2151                         }
2152                         if (!left)
2153                                 break;
2154                         neg = 0;
2155                         len = left;
2156                         if (len > TMPBUFLEN-1)
2157                                 len = TMPBUFLEN-1;
2158                         if (copy_from_user(buf, s, len))
2159                                 return -EFAULT;
2160                         buf[len] = 0;
2161                         p = buf;
2162                         if (*p == '-' && left > 1) {
2163                                 neg = 1;
2164                                 p++;
2165                         }
2166                         if (*p < '0' || *p > '9')
2167                                 break;
2168                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2169                         len = p-buf;
2170                         if ((len < left) && *p && !isspace(*p))
2171                                 break;
2172                         if (neg)
2173                                 val = -val;
2174                         s += len;
2175                         left -= len;
2176
2177                         if(neg)
2178                                 continue;
2179                         if ((min && val < *min) || (max && val > *max))
2180                                 continue;
2181                         *i = val;
2182                 } else {
2183                         p = buf;
2184                         if (!first)
2185                                 *p++ = '\t';
2186                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2187                         len = strlen(buf);
2188                         if (len > left)
2189                                 len = left;
2190                         if(copy_to_user(s, buf, len))
2191                                 return -EFAULT;
2192                         left -= len;
2193                         s += len;
2194                 }
2195         }
2196
2197         if (!write && !first && left) {
2198                 if(put_user('\n', s))
2199                         return -EFAULT;
2200                 left--, s++;
2201         }
2202         if (write) {
2203                 while (left) {
2204                         char c;
2205                         if (get_user(c, s++))
2206                                 return -EFAULT;
2207                         if (!isspace(c))
2208                                 break;
2209                         left--;
2210                 }
2211         }
2212         if (write && first)
2213                 return -EINVAL;
2214         *lenp -= left;
2215         *ppos += *lenp;
2216         return 0;
2217 #undef TMPBUFLEN
2218 }
2219
2220 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2221                                      struct file *filp,
2222                                      void __user *buffer,
2223                                      size_t *lenp, loff_t *ppos,
2224                                      unsigned long convmul,
2225                                      unsigned long convdiv)
2226 {
2227         return __do_proc_doulongvec_minmax(table->data, table, write,
2228                         filp, buffer, lenp, ppos, convmul, convdiv);
2229 }
2230
2231 /**
2232  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2233  * @table: the sysctl table
2234  * @write: %TRUE if this is a write to the sysctl file
2235  * @filp: the file structure
2236  * @buffer: the user buffer
2237  * @lenp: the size of the user buffer
2238  * @ppos: file position
2239  *
2240  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2241  * values from/to the user buffer, treated as an ASCII string.
2242  *
2243  * This routine will ensure the values are within the range specified by
2244  * table->extra1 (min) and table->extra2 (max).
2245  *
2246  * Returns 0 on success.
2247  */
2248 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2249                            void __user *buffer, size_t *lenp, loff_t *ppos)
2250 {
2251     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2252 }
2253
2254 /**
2255  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2256  * @table: the sysctl table
2257  * @write: %TRUE if this is a write to the sysctl file
2258  * @filp: the file structure
2259  * @buffer: the user buffer
2260  * @lenp: the size of the user buffer
2261  * @ppos: file position
2262  *
2263  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2264  * values from/to the user buffer, treated as an ASCII string. The values
2265  * are treated as milliseconds, and converted to jiffies when they are stored.
2266  *
2267  * This routine will ensure the values are within the range specified by
2268  * table->extra1 (min) and table->extra2 (max).
2269  *
2270  * Returns 0 on success.
2271  */
2272 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2273                                       struct file *filp,
2274                                       void __user *buffer,
2275                                       size_t *lenp, loff_t *ppos)
2276 {
2277     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2278                                      lenp, ppos, HZ, 1000l);
2279 }
2280
2281
2282 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2283                                          int *valp,
2284                                          int write, void *data)
2285 {
2286         if (write) {
2287                 if (*lvalp > LONG_MAX / HZ)
2288                         return 1;
2289                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2290         } else {
2291                 int val = *valp;
2292                 unsigned long lval;
2293                 if (val < 0) {
2294                         *negp = -1;
2295                         lval = (unsigned long)-val;
2296                 } else {
2297                         *negp = 0;
2298                         lval = (unsigned long)val;
2299                 }
2300                 *lvalp = lval / HZ;
2301         }
2302         return 0;
2303 }
2304
2305 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2306                                                 int *valp,
2307                                                 int write, void *data)
2308 {
2309         if (write) {
2310                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2311                         return 1;
2312                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2313         } else {
2314                 int val = *valp;
2315                 unsigned long lval;
2316                 if (val < 0) {
2317                         *negp = -1;
2318                         lval = (unsigned long)-val;
2319                 } else {
2320                         *negp = 0;
2321                         lval = (unsigned long)val;
2322                 }
2323                 *lvalp = jiffies_to_clock_t(lval);
2324         }
2325         return 0;
2326 }
2327
2328 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2329                                             int *valp,
2330                                             int write, void *data)
2331 {
2332         if (write) {
2333                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2334         } else {
2335                 int val = *valp;
2336                 unsigned long lval;
2337                 if (val < 0) {
2338                         *negp = -1;
2339                         lval = (unsigned long)-val;
2340                 } else {
2341                         *negp = 0;
2342                         lval = (unsigned long)val;
2343                 }
2344                 *lvalp = jiffies_to_msecs(lval);
2345         }
2346         return 0;
2347 }
2348
2349 /**
2350  * proc_dointvec_jiffies - read a vector of integers as seconds
2351  * @table: the sysctl table
2352  * @write: %TRUE if this is a write to the sysctl file
2353  * @filp: the file structure
2354  * @buffer: the user buffer
2355  * @lenp: the size of the user buffer
2356  * @ppos: file position
2357  *
2358  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2359  * values from/to the user buffer, treated as an ASCII string.
2360  * The values read are assumed to be in seconds, and are converted into
2361  * jiffies.
2362  *
2363  * Returns 0 on success.
2364  */
2365 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2366                           void __user *buffer, size_t *lenp, loff_t *ppos)
2367 {
2368     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2369                             do_proc_dointvec_jiffies_conv,NULL);
2370 }
2371
2372 /**
2373  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2374  * @table: the sysctl table
2375  * @write: %TRUE if this is a write to the sysctl file
2376  * @filp: the file structure
2377  * @buffer: the user buffer
2378  * @lenp: the size of the user buffer
2379  * @ppos: pointer to the file position
2380  *
2381  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2382  * values from/to the user buffer, treated as an ASCII string.
2383  * The values read are assumed to be in 1/USER_HZ seconds, and
2384  * are converted into jiffies.
2385  *
2386  * Returns 0 on success.
2387  */
2388 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2389                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2390 {
2391     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2392                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2393 }
2394
2395 /**
2396  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2397  * @table: the sysctl table
2398  * @write: %TRUE if this is a write to the sysctl file
2399  * @filp: the file structure
2400  * @buffer: the user buffer
2401  * @lenp: the size of the user buffer
2402  * @ppos: file position
2403  * @ppos: the current position in the file
2404  *
2405  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2406  * values from/to the user buffer, treated as an ASCII string.
2407  * The values read are assumed to be in 1/1000 seconds, and
2408  * are converted into jiffies.
2409  *
2410  * Returns 0 on success.
2411  */
2412 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2413                              void __user *buffer, size_t *lenp, loff_t *ppos)
2414 {
2415         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2416                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2417 }
2418
2419 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2420                            void __user *buffer, size_t *lenp, loff_t *ppos)
2421 {
2422         struct pid *new_pid;
2423         pid_t tmp;
2424         int r;
2425
2426         tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
2427
2428         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2429                                lenp, ppos, NULL, NULL);
2430         if (r || !write)
2431                 return r;
2432
2433         new_pid = find_get_pid(tmp);
2434         if (!new_pid)
2435                 return -ESRCH;
2436
2437         put_pid(xchg(&cad_pid, new_pid));
2438         return 0;
2439 }
2440
2441 #else /* CONFIG_PROC_FS */
2442
2443 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2444                   void __user *buffer, size_t *lenp, loff_t *ppos)
2445 {
2446         return -ENOSYS;
2447 }
2448
2449 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2450                   void __user *buffer, size_t *lenp, loff_t *ppos)
2451 {
2452         return -ENOSYS;
2453 }
2454
2455 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2456                         void __user *buffer, size_t *lenp, loff_t *ppos)
2457 {
2458         return -ENOSYS;
2459 }
2460
2461 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2462                     void __user *buffer, size_t *lenp, loff_t *ppos)
2463 {
2464         return -ENOSYS;
2465 }
2466
2467 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2468                     void __user *buffer, size_t *lenp, loff_t *ppos)
2469 {
2470         return -ENOSYS;
2471 }
2472
2473 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2474                     void __user *buffer, size_t *lenp, loff_t *ppos)
2475 {
2476         return -ENOSYS;
2477 }
2478
2479 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2480                              void __user *buffer, size_t *lenp, loff_t *ppos)
2481 {
2482         return -ENOSYS;
2483 }
2484
2485 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2486                     void __user *buffer, size_t *lenp, loff_t *ppos)
2487 {
2488         return -ENOSYS;
2489 }
2490
2491 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2492                                       struct file *filp,
2493                                       void __user *buffer,
2494                                       size_t *lenp, loff_t *ppos)
2495 {
2496     return -ENOSYS;
2497 }
2498
2499
2500 #endif /* CONFIG_PROC_FS */
2501
2502
2503 #ifdef CONFIG_SYSCTL_SYSCALL
2504 /*
2505  * General sysctl support routines
2506  */
2507
2508 /* The generic sysctl data routine (used if no strategy routine supplied) */
2509 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2510                 void __user *oldval, size_t __user *oldlenp,
2511                 void __user *newval, size_t newlen)
2512 {
2513         size_t len;
2514
2515         /* Get out of I don't have a variable */
2516         if (!table->data || !table->maxlen)
2517                 return -ENOTDIR;
2518
2519         if (oldval && oldlenp) {
2520                 if (get_user(len, oldlenp))
2521                         return -EFAULT;
2522                 if (len) {
2523                         if (len > table->maxlen)
2524                                 len = table->maxlen;
2525                         if (copy_to_user(oldval, table->data, len))
2526                                 return -EFAULT;
2527                         if (put_user(len, oldlenp))
2528                                 return -EFAULT;
2529                 }
2530         }
2531
2532         if (newval && newlen) {
2533                 if (newlen > table->maxlen)
2534                         newlen = table->maxlen;
2535
2536                 if (copy_from_user(table->data, newval, newlen))
2537                         return -EFAULT;
2538         }
2539         return 1;
2540 }
2541
2542 /* The generic string strategy routine: */
2543 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2544                   void __user *oldval, size_t __user *oldlenp,
2545                   void __user *newval, size_t newlen)
2546 {
2547         if (!table->data || !table->maxlen)
2548                 return -ENOTDIR;
2549
2550         if (oldval && oldlenp) {
2551                 size_t bufsize;
2552                 if (get_user(bufsize, oldlenp))
2553                         return -EFAULT;
2554                 if (bufsize) {
2555                         size_t len = strlen(table->data), copied;
2556
2557                         /* This shouldn't trigger for a well-formed sysctl */
2558                         if (len > table->maxlen)
2559                                 len = table->maxlen;
2560
2561                         /* Copy up to a max of bufsize-1 bytes of the string */
2562                         copied = (len >= bufsize) ? bufsize - 1 : len;
2563
2564                         if (copy_to_user(oldval, table->data, copied) ||
2565                             put_user(0, (char __user *)(oldval + copied)))
2566                                 return -EFAULT;
2567                         if (put_user(len, oldlenp))
2568                                 return -EFAULT;
2569                 }
2570         }
2571         if (newval && newlen) {
2572                 size_t len = newlen;
2573                 if (len > table->maxlen)
2574                         len = table->maxlen;
2575                 if(copy_from_user(table->data, newval, len))
2576                         return -EFAULT;
2577                 if (len == table->maxlen)
2578                         len--;
2579                 ((char *) table->data)[len] = 0;
2580         }
2581         return 1;
2582 }
2583
2584 /*
2585  * This function makes sure that all of the integers in the vector
2586  * are between the minimum and maximum values given in the arrays
2587  * table->extra1 and table->extra2, respectively.
2588  */
2589 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2590                 void __user *oldval, size_t __user *oldlenp,
2591                 void __user *newval, size_t newlen)
2592 {
2593
2594         if (newval && newlen) {
2595                 int __user *vec = (int __user *) newval;
2596                 int *min = (int *) table->extra1;
2597                 int *max = (int *) table->extra2;
2598                 size_t length;
2599                 int i;
2600
2601                 if (newlen % sizeof(int) != 0)
2602                         return -EINVAL;
2603
2604                 if (!table->extra1 && !table->extra2)
2605                         return 0;
2606
2607                 if (newlen > table->maxlen)
2608                         newlen = table->maxlen;
2609                 length = newlen / sizeof(int);
2610
2611                 for (i = 0; i < length; i++) {
2612                         int value;
2613                         if (get_user(value, vec + i))
2614                                 return -EFAULT;
2615                         if (min && value < min[i])
2616                                 return -EINVAL;
2617                         if (max && value > max[i])
2618                                 return -EINVAL;
2619                 }
2620         }
2621         return 0;
2622 }
2623
2624 /* Strategy function to convert jiffies to seconds */
2625 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2626                 void __user *oldval, size_t __user *oldlenp,
2627                 void __user *newval, size_t newlen)
2628 {
2629         if (oldval && oldlenp) {
2630                 size_t olen;
2631
2632                 if (get_user(olen, oldlenp))
2633                         return -EFAULT;
2634                 if (olen) {
2635                         int val;
2636
2637                         if (olen < sizeof(int))
2638                                 return -EINVAL;
2639
2640                         val = *(int *)(table->data) / HZ;
2641                         if (put_user(val, (int __user *)oldval))
2642                                 return -EFAULT;
2643                         if (put_user(sizeof(int), oldlenp))
2644                                 return -EFAULT;
2645                 }
2646         }
2647         if (newval && newlen) {
2648                 int new;
2649                 if (newlen != sizeof(int))
2650                         return -EINVAL;
2651                 if (get_user(new, (int __user *)newval))
2652                         return -EFAULT;
2653                 *(int *)(table->data) = new*HZ;
2654         }
2655         return 1;
2656 }
2657
2658 /* Strategy function to convert jiffies to seconds */
2659 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2660                 void __user *oldval, size_t __user *oldlenp,
2661                 void __user *newval, size_t newlen)
2662 {
2663         if (oldval && oldlenp) {
2664                 size_t olen;
2665
2666                 if (get_user(olen, oldlenp))
2667                         return -EFAULT;
2668                 if (olen) {
2669                         int val;
2670
2671                         if (olen < sizeof(int))
2672                                 return -EINVAL;
2673
2674                         val = jiffies_to_msecs(*(int *)(table->data));
2675                         if (put_user(val, (int __user *)oldval))
2676                                 return -EFAULT;
2677                         if (put_user(sizeof(int), oldlenp))
2678                                 return -EFAULT;
2679                 }
2680         }
2681         if (newval && newlen) {
2682                 int new;
2683                 if (newlen != sizeof(int))
2684                         return -EINVAL;
2685                 if (get_user(new, (int __user *)newval))
2686                         return -EFAULT;
2687                 *(int *)(table->data) = msecs_to_jiffies(new);
2688         }
2689         return 1;
2690 }
2691
2692
2693
2694 #else /* CONFIG_SYSCTL_SYSCALL */
2695
2696
2697 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2698 {
2699         struct __sysctl_args tmp;
2700         int error;
2701
2702         if (copy_from_user(&tmp, args, sizeof(tmp)))
2703                 return -EFAULT;
2704
2705         error = deprecated_sysctl_warning(&tmp);
2706
2707         /* If no error reading the parameters then just -ENOSYS ... */
2708         if (!error)
2709                 error = -ENOSYS;
2710
2711         return error;
2712 }
2713
2714 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2715                   void __user *oldval, size_t __user *oldlenp,
2716                   void __user *newval, size_t newlen)
2717 {
2718         return -ENOSYS;
2719 }
2720
2721 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2722                   void __user *oldval, size_t __user *oldlenp,
2723                   void __user *newval, size_t newlen)
2724 {
2725         return -ENOSYS;
2726 }
2727
2728 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2729                 void __user *oldval, size_t __user *oldlenp,
2730                 void __user *newval, size_t newlen)
2731 {
2732         return -ENOSYS;
2733 }
2734
2735 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2736                 void __user *oldval, size_t __user *oldlenp,
2737                 void __user *newval, size_t newlen)
2738 {
2739         return -ENOSYS;
2740 }
2741
2742 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2743                 void __user *oldval, size_t __user *oldlenp,
2744                 void __user *newval, size_t newlen)
2745 {
2746         return -ENOSYS;
2747 }
2748
2749 #endif /* CONFIG_SYSCTL_SYSCALL */
2750
2751 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2752 {
2753         static int msg_count;
2754         int name[CTL_MAXNAME];
2755         int i;
2756
2757         /* Check args->nlen. */
2758         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2759                 return -ENOTDIR;
2760
2761         /* Read in the sysctl name for better debug message logging */
2762         for (i = 0; i < args->nlen; i++)
2763                 if (get_user(name[i], args->name + i))
2764                         return -EFAULT;
2765
2766         /* Ignore accesses to kernel.version */
2767         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2768                 return 0;
2769
2770         if (msg_count < 5) {
2771                 msg_count++;
2772                 printk(KERN_INFO
2773                         "warning: process `%s' used the deprecated sysctl "
2774                         "system call with ", current->comm);
2775                 for (i = 0; i < args->nlen; i++)
2776                         printk("%d.", name[i]);
2777                 printk("\n");
2778         }
2779         return 0;
2780 }
2781
2782 /*
2783  * No sense putting this after each symbol definition, twice,
2784  * exception granted :-)
2785  */
2786 EXPORT_SYMBOL(proc_dointvec);
2787 EXPORT_SYMBOL(proc_dointvec_jiffies);
2788 EXPORT_SYMBOL(proc_dointvec_minmax);
2789 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2790 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2791 EXPORT_SYMBOL(proc_dostring);
2792 EXPORT_SYMBOL(proc_doulongvec_minmax);
2793 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2794 EXPORT_SYMBOL(register_sysctl_table);
2795 EXPORT_SYMBOL(register_sysctl_paths);
2796 EXPORT_SYMBOL(sysctl_intvec);
2797 EXPORT_SYMBOL(sysctl_jiffies);
2798 EXPORT_SYMBOL(sysctl_ms_jiffies);
2799 EXPORT_SYMBOL(sysctl_string);
2800 EXPORT_SYMBOL(sysctl_data);
2801 EXPORT_SYMBOL(unregister_sysctl_table);