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