git.oblomov.eu Git - linux-2.6/blob - kernel/sysctl.c

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