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/vmstat.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/acpi.h>
  49 #include <linux/reboot.h>
  50 #include <linux/ftrace.h>
  51
  52 #include <asm/uaccess.h>
  53 #include <asm/processor.h>
  54
  55 #ifdef CONFIG_X86
  56 #include <asm/nmi.h>
  57 #include <asm/stacktrace.h>
  58 #include <asm/io.h>
  59 #endif
  60
  61 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  62
  63 #if defined(CONFIG_SYSCTL)
  64
  65 /* External variables not in a header file. */
  66 extern int C_A_D;
  67 extern int print_fatal_signals;
  68 extern int sysctl_overcommit_memory;
  69 extern int sysctl_overcommit_ratio;
  70 extern int sysctl_panic_on_oom;
  71 extern int sysctl_oom_kill_allocating_task;
  72 extern int sysctl_oom_dump_tasks;
  73 extern int max_threads;
  74 extern int core_uses_pid;
  75 extern int suid_dumpable;
  76 extern char core_pattern[];
  77 extern int pid_max;
  78 extern int min_free_kbytes;
  79 extern int pid_max_min, pid_max_max;
  80 extern int sysctl_drop_caches;
  81 extern int percpu_pagelist_fraction;
  82 extern int compat_log;
  83 extern int latencytop_enabled;
  84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  85 #ifndef CONFIG_MMU
  86 extern int sysctl_nr_trim_pages;
  87 #endif
  88 #ifdef CONFIG_RCU_TORTURE_TEST
  89 extern int rcutorture_runnable;
  90 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
  91
  92 /* Constants used for minimum and  maximum */
  93 #ifdef CONFIG_DETECT_SOFTLOCKUP
  94 static int sixty = 60;
  95 static int neg_one = -1;
  96 #endif
  97
  98 #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
  99 static int two = 2;
 100 #endif
 101
 102 static int zero;
 103 static int one = 1;
 104 static int one_hundred = 100;
 105
 106 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 107 static int maxolduid = 65535;
 108 static int minolduid;
 109 static int min_percpu_pagelist_fract = 8;
 110
 111 static int ngroups_max = NGROUPS_MAX;
 112
 113 #ifdef CONFIG_MODULES
 114 extern char modprobe_path[];
 115 #endif
 116 #ifdef CONFIG_CHR_DEV_SG
 117 extern int sg_big_buff;
 118 #endif
 119
 120 #ifdef CONFIG_SPARC
 121 #include <asm/system.h>
 122 #endif
 123
 124 #ifdef CONFIG_SPARC64
 125 extern int sysctl_tsb_ratio;
 126 #endif
 127
 128 #ifdef __hppa__
 129 extern int pwrsw_enabled;
 130 extern int unaligned_enabled;
 131 #endif
 132
 133 #ifdef CONFIG_S390
 134 #ifdef CONFIG_MATHEMU
 135 extern int sysctl_ieee_emulation_warnings;
 136 #endif
 137 extern int sysctl_userprocess_debug;
 138 extern int spin_retry;
 139 #endif
 140
 141 #ifdef CONFIG_BSD_PROCESS_ACCT
 142 extern int acct_parm[];
 143 #endif
 144
 145 #ifdef CONFIG_IA64
 146 extern int no_unaligned_warning;
 147 #endif
 148
 149 #ifdef CONFIG_RT_MUTEXES
 150 extern int max_lock_depth;
 151 #endif
 152
 153 #ifdef CONFIG_PROC_SYSCTL
 154 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 155                   void __user *buffer, size_t *lenp, loff_t *ppos);
 156 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
 157                                void __user *buffer, size_t *lenp, loff_t *ppos);
 158 #endif
 159
 160 static struct ctl_table root_table[];
 161 static struct ctl_table_root sysctl_table_root;
 162 static struct ctl_table_header root_table_header = {
 163         .count = 1,
 164         .ctl_table = root_table,
 165         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
 166         .root = &sysctl_table_root,
 167         .set = &sysctl_table_root.default_set,
 168 };
 169 static struct ctl_table_root sysctl_table_root = {
 170         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 171         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 172 };
 173
 174 static struct ctl_table kern_table[];
 175 static struct ctl_table vm_table[];
 176 static struct ctl_table fs_table[];
 177 static struct ctl_table debug_table[];
 178 static struct ctl_table dev_table[];
 179 extern struct ctl_table random_table[];
 180 #ifdef CONFIG_INOTIFY_USER
 181 extern struct ctl_table inotify_table[];
 182 #endif
 183 #ifdef CONFIG_EPOLL
 184 extern struct ctl_table epoll_table[];
 185 #endif
 186
 187 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 188 int sysctl_legacy_va_layout;
 189 #endif
 190
 191 extern int prove_locking;
 192 extern int lock_stat;
 193
 194 /* The default sysctl tables: */
 195
 196 static struct ctl_table root_table[] = {
 197         {
 198                 .ctl_name       = CTL_KERN,
 199                 .procname       = "kernel",
 200                 .mode           = 0555,
 201                 .child          = kern_table,
 202         },
 203         {
 204                 .ctl_name       = CTL_VM,
 205                 .procname       = "vm",
 206                 .mode           = 0555,
 207                 .child          = vm_table,
 208         },
 209         {
 210                 .ctl_name       = CTL_FS,
 211                 .procname       = "fs",
 212                 .mode           = 0555,
 213                 .child          = fs_table,
 214         },
 215         {
 216                 .ctl_name       = CTL_DEBUG,
 217                 .procname       = "debug",
 218                 .mode           = 0555,
 219                 .child          = debug_table,
 220         },
 221         {
 222                 .ctl_name       = CTL_DEV,
 223                 .procname       = "dev",
 224                 .mode           = 0555,
 225                 .child          = dev_table,
 226         },
 227 /*
 228  * NOTE: do not add new entries to this table unless you have read
 229  * Documentation/sysctl/ctl_unnumbered.txt
 230  */
 231         { .ctl_name = 0 }
 232 };
 233
 234 #ifdef CONFIG_SCHED_DEBUG
 235 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 236 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 237 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 238 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 239 #endif
 240
 241 static struct ctl_table kern_table[] = {
 242 #ifdef CONFIG_SCHED_DEBUG
 243         {
 244                 .ctl_name       = CTL_UNNUMBERED,
 245                 .procname       = "sched_min_granularity_ns",
 246                 .data           = &sysctl_sched_min_granularity,
 247                 .maxlen         = sizeof(unsigned int),
 248                 .mode           = 0644,
 249                 .proc_handler   = &sched_nr_latency_handler,
 250                 .strategy       = &sysctl_intvec,
 251                 .extra1         = &min_sched_granularity_ns,
 252                 .extra2         = &max_sched_granularity_ns,
 253         },
 254         {
 255                 .ctl_name       = CTL_UNNUMBERED,
 256                 .procname       = "sched_latency_ns",
 257                 .data           = &sysctl_sched_latency,
 258                 .maxlen         = sizeof(unsigned int),
 259                 .mode           = 0644,
 260                 .proc_handler   = &sched_nr_latency_handler,
 261                 .strategy       = &sysctl_intvec,
 262                 .extra1         = &min_sched_granularity_ns,
 263                 .extra2         = &max_sched_granularity_ns,
 264         },
 265         {
 266                 .ctl_name       = CTL_UNNUMBERED,
 267                 .procname       = "sched_wakeup_granularity_ns",
 268                 .data           = &sysctl_sched_wakeup_granularity,
 269                 .maxlen         = sizeof(unsigned int),
 270                 .mode           = 0644,
 271                 .proc_handler   = &proc_dointvec_minmax,
 272                 .strategy       = &sysctl_intvec,
 273                 .extra1         = &min_wakeup_granularity_ns,
 274                 .extra2         = &max_wakeup_granularity_ns,
 275         },
 276         {
 277                 .ctl_name       = CTL_UNNUMBERED,
 278                 .procname       = "sched_shares_ratelimit",
 279                 .data           = &sysctl_sched_shares_ratelimit,
 280                 .maxlen         = sizeof(unsigned int),
 281                 .mode           = 0644,
 282                 .proc_handler   = &proc_dointvec,
 283         },
 284         {
 285                 .ctl_name       = CTL_UNNUMBERED,
 286                 .procname       = "sched_shares_thresh",
 287                 .data           = &sysctl_sched_shares_thresh,
 288                 .maxlen         = sizeof(unsigned int),
 289                 .mode           = 0644,
 290                 .proc_handler   = &proc_dointvec_minmax,
 291                 .strategy       = &sysctl_intvec,
 292                 .extra1         = &zero,
 293         },
 294         {
 295                 .ctl_name       = CTL_UNNUMBERED,
 296                 .procname       = "sched_child_runs_first",
 297                 .data           = &sysctl_sched_child_runs_first,
 298                 .maxlen         = sizeof(unsigned int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec,
 301         },
 302         {
 303                 .ctl_name       = CTL_UNNUMBERED,
 304                 .procname       = "sched_features",
 305                 .data           = &sysctl_sched_features,
 306                 .maxlen         = sizeof(unsigned int),
 307                 .mode           = 0644,
 308                 .proc_handler   = &proc_dointvec,
 309         },
 310         {
 311                 .ctl_name       = CTL_UNNUMBERED,
 312                 .procname       = "sched_migration_cost",
 313                 .data           = &sysctl_sched_migration_cost,
 314                 .maxlen         = sizeof(unsigned int),
 315                 .mode           = 0644,
 316                 .proc_handler   = &proc_dointvec,
 317         },
 318         {
 319                 .ctl_name       = CTL_UNNUMBERED,
 320                 .procname       = "sched_nr_migrate",
 321                 .data           = &sysctl_sched_nr_migrate,
 322                 .maxlen         = sizeof(unsigned int),
 323                 .mode           = 0644,
 324                 .proc_handler   = &proc_dointvec,
 325         },
 326 #endif
 327         {
 328                 .ctl_name       = CTL_UNNUMBERED,
 329                 .procname       = "sched_rt_period_us",
 330                 .data           = &sysctl_sched_rt_period,
 331                 .maxlen         = sizeof(unsigned int),
 332                 .mode           = 0644,
 333                 .proc_handler   = &sched_rt_handler,
 334         },
 335         {
 336                 .ctl_name       = CTL_UNNUMBERED,
 337                 .procname       = "sched_rt_runtime_us",
 338                 .data           = &sysctl_sched_rt_runtime,
 339                 .maxlen         = sizeof(int),
 340                 .mode           = 0644,
 341                 .proc_handler   = &sched_rt_handler,
 342         },
 343         {
 344                 .ctl_name       = CTL_UNNUMBERED,
 345                 .procname       = "sched_compat_yield",
 346                 .data           = &sysctl_sched_compat_yield,
 347                 .maxlen         = sizeof(unsigned int),
 348                 .mode           = 0644,
 349                 .proc_handler   = &proc_dointvec,
 350         },
 351 #ifdef CONFIG_PROVE_LOCKING
 352         {
 353                 .ctl_name       = CTL_UNNUMBERED,
 354                 .procname       = "prove_locking",
 355                 .data           = &prove_locking,
 356                 .maxlen         = sizeof(int),
 357                 .mode           = 0644,
 358                 .proc_handler   = &proc_dointvec,
 359         },
 360 #endif
 361 #ifdef CONFIG_LOCK_STAT
 362         {
 363                 .ctl_name       = CTL_UNNUMBERED,
 364                 .procname       = "lock_stat",
 365                 .data           = &lock_stat,
 366                 .maxlen         = sizeof(int),
 367                 .mode           = 0644,
 368                 .proc_handler   = &proc_dointvec,
 369         },
 370 #endif
 371         {
 372                 .ctl_name       = KERN_PANIC,
 373                 .procname       = "panic",
 374                 .data           = &panic_timeout,
 375                 .maxlen         = sizeof(int),
 376                 .mode           = 0644,
 377                 .proc_handler   = &proc_dointvec,
 378         },
 379         {
 380                 .ctl_name       = KERN_CORE_USES_PID,
 381                 .procname       = "core_uses_pid",
 382                 .data           = &core_uses_pid,
 383                 .maxlen         = sizeof(int),
 384                 .mode           = 0644,
 385                 .proc_handler   = &proc_dointvec,
 386         },
 387         {
 388                 .ctl_name       = KERN_CORE_PATTERN,
 389                 .procname       = "core_pattern",
 390                 .data           = core_pattern,
 391                 .maxlen         = CORENAME_MAX_SIZE,
 392                 .mode           = 0644,
 393                 .proc_handler   = &proc_dostring,
 394                 .strategy       = &sysctl_string,
 395         },
 396 #ifdef CONFIG_PROC_SYSCTL
 397         {
 398                 .procname       = "tainted",
 399                 .maxlen         = sizeof(long),
 400                 .mode           = 0644,
 401                 .proc_handler   = &proc_taint,
 402         },
 403 #endif
 404 #ifdef CONFIG_LATENCYTOP
 405         {
 406                 .procname       = "latencytop",
 407                 .data           = &latencytop_enabled,
 408                 .maxlen         = sizeof(int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec,
 411         },
 412 #endif
 413 #ifdef CONFIG_BLK_DEV_INITRD
 414         {
 415                 .ctl_name       = KERN_REALROOTDEV,
 416                 .procname       = "real-root-dev",
 417                 .data           = &real_root_dev,
 418                 .maxlen         = sizeof(int),
 419                 .mode           = 0644,
 420                 .proc_handler   = &proc_dointvec,
 421         },
 422 #endif
 423         {
 424                 .ctl_name       = CTL_UNNUMBERED,
 425                 .procname       = "print-fatal-signals",
 426                 .data           = &print_fatal_signals,
 427                 .maxlen         = sizeof(int),
 428                 .mode           = 0644,
 429                 .proc_handler   = &proc_dointvec,
 430         },
 431 #ifdef CONFIG_SPARC
 432         {
 433                 .ctl_name       = KERN_SPARC_REBOOT,
 434                 .procname       = "reboot-cmd",
 435                 .data           = reboot_command,
 436                 .maxlen         = 256,
 437                 .mode           = 0644,
 438                 .proc_handler   = &proc_dostring,
 439                 .strategy       = &sysctl_string,
 440         },
 441         {
 442                 .ctl_name       = KERN_SPARC_STOP_A,
 443                 .procname       = "stop-a",
 444                 .data           = &stop_a_enabled,
 445                 .maxlen         = sizeof (int),
 446                 .mode           = 0644,
 447                 .proc_handler   = &proc_dointvec,
 448         },
 449         {
 450                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 451                 .procname       = "scons-poweroff",
 452                 .data           = &scons_pwroff,
 453                 .maxlen         = sizeof (int),
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dointvec,
 456         },
 457 #endif
 458 #ifdef CONFIG_SPARC64
 459         {
 460                 .ctl_name       = CTL_UNNUMBERED,
 461                 .procname       = "tsb-ratio",
 462                 .data           = &sysctl_tsb_ratio,
 463                 .maxlen         = sizeof (int),
 464                 .mode           = 0644,
 465                 .proc_handler   = &proc_dointvec,
 466         },
 467 #endif
 468 #ifdef __hppa__
 469         {
 470                 .ctl_name       = KERN_HPPA_PWRSW,
 471                 .procname       = "soft-power",
 472                 .data           = &pwrsw_enabled,
 473                 .maxlen         = sizeof (int),
 474                 .mode           = 0644,
 475                 .proc_handler   = &proc_dointvec,
 476         },
 477         {
 478                 .ctl_name       = KERN_HPPA_UNALIGNED,
 479                 .procname       = "unaligned-trap",
 480                 .data           = &unaligned_enabled,
 481                 .maxlen         = sizeof (int),
 482                 .mode           = 0644,
 483                 .proc_handler   = &proc_dointvec,
 484         },
 485 #endif
 486         {
 487                 .ctl_name       = KERN_CTLALTDEL,
 488                 .procname       = "ctrl-alt-del",
 489                 .data           = &C_A_D,
 490                 .maxlen         = sizeof(int),
 491                 .mode           = 0644,
 492                 .proc_handler   = &proc_dointvec,
 493         },
 494 #ifdef CONFIG_FUNCTION_TRACER
 495         {
 496                 .ctl_name       = CTL_UNNUMBERED,
 497                 .procname       = "ftrace_enabled",
 498                 .data           = &ftrace_enabled,
 499                 .maxlen         = sizeof(int),
 500                 .mode           = 0644,
 501                 .proc_handler   = &ftrace_enable_sysctl,
 502         },
 503 #endif
 504 #ifdef CONFIG_STACK_TRACER
 505         {
 506                 .ctl_name       = CTL_UNNUMBERED,
 507                 .procname       = "stack_tracer_enabled",
 508                 .data           = &stack_tracer_enabled,
 509                 .maxlen         = sizeof(int),
 510                 .mode           = 0644,
 511                 .proc_handler   = &stack_trace_sysctl,
 512         },
 513 #endif
 514 #ifdef CONFIG_TRACING
 515         {
 516                 .ctl_name       = CTL_UNNUMBERED,
 517                 .procname       = "ftrace_dump_on_oops",
 518                 .data           = &ftrace_dump_on_oops,
 519                 .maxlen         = sizeof(int),
 520                 .mode           = 0644,
 521                 .proc_handler   = &proc_dointvec,
 522         },
 523 #endif
 524 #ifdef CONFIG_MODULES
 525         {
 526                 .ctl_name       = KERN_MODPROBE,
 527                 .procname       = "modprobe",
 528                 .data           = &modprobe_path,
 529                 .maxlen         = KMOD_PATH_LEN,
 530                 .mode           = 0644,
 531                 .proc_handler   = &proc_dostring,
 532                 .strategy       = &sysctl_string,
 533         },
 534 #endif
 535 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 536         {
 537                 .ctl_name       = KERN_HOTPLUG,
 538                 .procname       = "hotplug",
 539                 .data           = &uevent_helper,
 540                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 541                 .mode           = 0644,
 542                 .proc_handler   = &proc_dostring,
 543                 .strategy       = &sysctl_string,
 544         },
 545 #endif
 546 #ifdef CONFIG_CHR_DEV_SG
 547         {
 548                 .ctl_name       = KERN_SG_BIG_BUFF,
 549                 .procname       = "sg-big-buff",
 550                 .data           = &sg_big_buff,
 551                 .maxlen         = sizeof (int),
 552                 .mode           = 0444,
 553                 .proc_handler   = &proc_dointvec,
 554         },
 555 #endif
 556 #ifdef CONFIG_BSD_PROCESS_ACCT
 557         {
 558                 .ctl_name       = KERN_ACCT,
 559                 .procname       = "acct",
 560                 .data           = &acct_parm,
 561                 .maxlen         = 3*sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec,
 564         },
 565 #endif
 566 #ifdef CONFIG_MAGIC_SYSRQ
 567         {
 568                 .ctl_name       = KERN_SYSRQ,
 569                 .procname       = "sysrq",
 570                 .data           = &__sysrq_enabled,
 571                 .maxlen         = sizeof (int),
 572                 .mode           = 0644,
 573                 .proc_handler   = &proc_dointvec,
 574         },
 575 #endif
 576 #ifdef CONFIG_PROC_SYSCTL
 577         {
 578                 .procname       = "cad_pid",
 579                 .data           = NULL,
 580                 .maxlen         = sizeof (int),
 581                 .mode           = 0600,
 582                 .proc_handler   = &proc_do_cad_pid,
 583         },
 584 #endif
 585         {
 586                 .ctl_name       = KERN_MAX_THREADS,
 587                 .procname       = "threads-max",
 588                 .data           = &max_threads,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = &proc_dointvec,
 592         },
 593         {
 594                 .ctl_name       = KERN_RANDOM,
 595                 .procname       = "random",
 596                 .mode           = 0555,
 597                 .child          = random_table,
 598         },
 599         {
 600                 .ctl_name       = KERN_OVERFLOWUID,
 601                 .procname       = "overflowuid",
 602                 .data           = &overflowuid,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = &proc_dointvec_minmax,
 606                 .strategy       = &sysctl_intvec,
 607                 .extra1         = &minolduid,
 608                 .extra2         = &maxolduid,
 609         },
 610         {
 611                 .ctl_name       = KERN_OVERFLOWGID,
 612                 .procname       = "overflowgid",
 613                 .data           = &overflowgid,
 614                 .maxlen         = sizeof(int),
 615                 .mode           = 0644,
 616                 .proc_handler   = &proc_dointvec_minmax,
 617                 .strategy       = &sysctl_intvec,
 618                 .extra1         = &minolduid,
 619                 .extra2         = &maxolduid,
 620         },
 621 #ifdef CONFIG_S390
 622 #ifdef CONFIG_MATHEMU
 623         {
 624                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 625                 .procname       = "ieee_emulation_warnings",
 626                 .data           = &sysctl_ieee_emulation_warnings,
 627                 .maxlen         = sizeof(int),
 628                 .mode           = 0644,
 629                 .proc_handler   = &proc_dointvec,
 630         },
 631 #endif
 632         {
 633                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 634                 .procname       = "userprocess_debug",
 635                 .data           = &sysctl_userprocess_debug,
 636                 .maxlen         = sizeof(int),
 637                 .mode           = 0644,
 638                 .proc_handler   = &proc_dointvec,
 639         },
 640 #endif
 641         {
 642                 .ctl_name       = KERN_PIDMAX,
 643                 .procname       = "pid_max",
 644                 .data           = &pid_max,
 645                 .maxlen         = sizeof (int),
 646                 .mode           = 0644,
 647                 .proc_handler   = &proc_dointvec_minmax,
 648                 .strategy       = sysctl_intvec,
 649                 .extra1         = &pid_max_min,
 650                 .extra2         = &pid_max_max,
 651         },
 652         {
 653                 .ctl_name       = KERN_PANIC_ON_OOPS,
 654                 .procname       = "panic_on_oops",
 655                 .data           = &panic_on_oops,
 656                 .maxlen         = sizeof(int),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_dointvec,
 659         },
 660 #if defined CONFIG_PRINTK
 661         {
 662                 .ctl_name       = KERN_PRINTK,
 663                 .procname       = "printk",
 664                 .data           = &console_loglevel,
 665                 .maxlen         = 4*sizeof(int),
 666                 .mode           = 0644,
 667                 .proc_handler   = &proc_dointvec,
 668         },
 669         {
 670                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 671                 .procname       = "printk_ratelimit",
 672                 .data           = &printk_ratelimit_state.interval,
 673                 .maxlen         = sizeof(int),
 674                 .mode           = 0644,
 675                 .proc_handler   = &proc_dointvec_jiffies,
 676                 .strategy       = &sysctl_jiffies,
 677         },
 678         {
 679                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 680                 .procname       = "printk_ratelimit_burst",
 681                 .data           = &printk_ratelimit_state.burst,
 682                 .maxlen         = sizeof(int),
 683                 .mode           = 0644,
 684                 .proc_handler   = &proc_dointvec,
 685         },
 686 #endif
 687         {
 688                 .ctl_name       = KERN_NGROUPS_MAX,
 689                 .procname       = "ngroups_max",
 690                 .data           = &ngroups_max,
 691                 .maxlen         = sizeof (int),
 692                 .mode           = 0444,
 693                 .proc_handler   = &proc_dointvec,
 694         },
 695 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 696         {
 697                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 698                 .procname       = "unknown_nmi_panic",
 699                 .data           = &unknown_nmi_panic,
 700                 .maxlen         = sizeof (int),
 701                 .mode           = 0644,
 702                 .proc_handler   = &proc_dointvec,
 703         },
 704         {
 705                 .procname       = "nmi_watchdog",
 706                 .data           = &nmi_watchdog_enabled,
 707                 .maxlen         = sizeof (int),
 708                 .mode           = 0644,
 709                 .proc_handler   = &proc_nmi_enabled,
 710         },
 711 #endif
 712 #if defined(CONFIG_X86)
 713         {
 714                 .ctl_name       = KERN_PANIC_ON_NMI,
 715                 .procname       = "panic_on_unrecovered_nmi",
 716                 .data           = &panic_on_unrecovered_nmi,
 717                 .maxlen         = sizeof(int),
 718                 .mode           = 0644,
 719                 .proc_handler   = &proc_dointvec,
 720         },
 721         {
 722                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 723                 .procname       = "bootloader_type",
 724                 .data           = &bootloader_type,
 725                 .maxlen         = sizeof (int),
 726                 .mode           = 0444,
 727                 .proc_handler   = &proc_dointvec,
 728         },
 729         {
 730                 .ctl_name       = CTL_UNNUMBERED,
 731                 .procname       = "kstack_depth_to_print",
 732                 .data           = &kstack_depth_to_print,
 733                 .maxlen         = sizeof(int),
 734                 .mode           = 0644,
 735                 .proc_handler   = &proc_dointvec,
 736         },
 737         {
 738                 .ctl_name       = CTL_UNNUMBERED,
 739                 .procname       = "io_delay_type",
 740                 .data           = &io_delay_type,
 741                 .maxlen         = sizeof(int),
 742                 .mode           = 0644,
 743                 .proc_handler   = &proc_dointvec,
 744         },
 745 #endif
 746 #if defined(CONFIG_MMU)
 747         {
 748                 .ctl_name       = KERN_RANDOMIZE,
 749                 .procname       = "randomize_va_space",
 750                 .data           = &randomize_va_space,
 751                 .maxlen         = sizeof(int),
 752                 .mode           = 0644,
 753                 .proc_handler   = &proc_dointvec,
 754         },
 755 #endif
 756 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 757         {
 758                 .ctl_name       = KERN_SPIN_RETRY,
 759                 .procname       = "spin_retry",
 760                 .data           = &spin_retry,
 761                 .maxlen         = sizeof (int),
 762                 .mode           = 0644,
 763                 .proc_handler   = &proc_dointvec,
 764         },
 765 #endif
 766 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 767         {
 768                 .procname       = "acpi_video_flags",
 769                 .data           = &acpi_realmode_flags,
 770                 .maxlen         = sizeof (unsigned long),
 771                 .mode           = 0644,
 772                 .proc_handler   = &proc_doulongvec_minmax,
 773         },
 774 #endif
 775 #ifdef CONFIG_IA64
 776         {
 777                 .ctl_name       = KERN_IA64_UNALIGNED,
 778                 .procname       = "ignore-unaligned-usertrap",
 779                 .data           = &no_unaligned_warning,
 780                 .maxlen         = sizeof (int),
 781                 .mode           = 0644,
 782                 .proc_handler   = &proc_dointvec,
 783         },
 784 #endif
 785 #ifdef CONFIG_DETECT_SOFTLOCKUP
 786         {
 787                 .ctl_name       = CTL_UNNUMBERED,
 788                 .procname       = "softlockup_panic",
 789                 .data           = &softlockup_panic,
 790                 .maxlen         = sizeof(int),
 791                 .mode           = 0644,
 792                 .proc_handler   = &proc_dointvec_minmax,
 793                 .strategy       = &sysctl_intvec,
 794                 .extra1         = &zero,
 795                 .extra2         = &one,
 796         },
 797         {
 798                 .ctl_name       = CTL_UNNUMBERED,
 799                 .procname       = "softlockup_thresh",
 800                 .data           = &softlockup_thresh,
 801                 .maxlen         = sizeof(int),
 802                 .mode           = 0644,
 803                 .proc_handler   = &proc_dointvec_minmax,
 804                 .strategy       = &sysctl_intvec,
 805                 .extra1         = &neg_one,
 806                 .extra2         = &sixty,
 807         },
 808         {
 809                 .ctl_name       = CTL_UNNUMBERED,
 810                 .procname       = "hung_task_check_count",
 811                 .data           = &sysctl_hung_task_check_count,
 812                 .maxlen         = sizeof(unsigned long),
 813                 .mode           = 0644,
 814                 .proc_handler   = &proc_doulongvec_minmax,
 815                 .strategy       = &sysctl_intvec,
 816         },
 817         {
 818                 .ctl_name       = CTL_UNNUMBERED,
 819                 .procname       = "hung_task_timeout_secs",
 820                 .data           = &sysctl_hung_task_timeout_secs,
 821                 .maxlen         = sizeof(unsigned long),
 822                 .mode           = 0644,
 823                 .proc_handler   = &proc_doulongvec_minmax,
 824                 .strategy       = &sysctl_intvec,
 825         },
 826         {
 827                 .ctl_name       = CTL_UNNUMBERED,
 828                 .procname       = "hung_task_warnings",
 829                 .data           = &sysctl_hung_task_warnings,
 830                 .maxlen         = sizeof(unsigned long),
 831                 .mode           = 0644,
 832                 .proc_handler   = &proc_doulongvec_minmax,
 833                 .strategy       = &sysctl_intvec,
 834         },
 835 #endif
 836 #ifdef CONFIG_COMPAT
 837         {
 838                 .ctl_name       = KERN_COMPAT_LOG,
 839                 .procname       = "compat-log",
 840                 .data           = &compat_log,
 841                 .maxlen         = sizeof (int),
 842                 .mode           = 0644,
 843                 .proc_handler   = &proc_dointvec,
 844         },
 845 #endif
 846 #ifdef CONFIG_RT_MUTEXES
 847         {
 848                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 849                 .procname       = "max_lock_depth",
 850                 .data           = &max_lock_depth,
 851                 .maxlen         = sizeof(int),
 852                 .mode           = 0644,
 853                 .proc_handler   = &proc_dointvec,
 854         },
 855 #endif
 856         {
 857                 .ctl_name       = CTL_UNNUMBERED,
 858                 .procname       = "poweroff_cmd",
 859                 .data           = &poweroff_cmd,
 860                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 861                 .mode           = 0644,
 862                 .proc_handler   = &proc_dostring,
 863                 .strategy       = &sysctl_string,
 864         },
 865 #ifdef CONFIG_KEYS
 866         {
 867                 .ctl_name       = CTL_UNNUMBERED,
 868                 .procname       = "keys",
 869                 .mode           = 0555,
 870                 .child          = key_sysctls,
 871         },
 872 #endif
 873 #ifdef CONFIG_RCU_TORTURE_TEST
 874         {
 875                 .ctl_name       = CTL_UNNUMBERED,
 876                 .procname       = "rcutorture_runnable",
 877                 .data           = &rcutorture_runnable,
 878                 .maxlen         = sizeof(int),
 879                 .mode           = 0644,
 880                 .proc_handler   = &proc_dointvec,
 881         },
 882 #endif
 883 #ifdef CONFIG_UNEVICTABLE_LRU
 884         {
 885                 .ctl_name       = CTL_UNNUMBERED,
 886                 .procname       = "scan_unevictable_pages",
 887                 .data           = &scan_unevictable_pages,
 888                 .maxlen         = sizeof(scan_unevictable_pages),
 889                 .mode           = 0644,
 890                 .proc_handler   = &scan_unevictable_handler,
 891         },
 892 #endif
 893 /*
 894  * NOTE: do not add new entries to this table unless you have read
 895  * Documentation/sysctl/ctl_unnumbered.txt
 896  */
 897         { .ctl_name = 0 }
 898 };
 899
 900 static struct ctl_table vm_table[] = {
 901         {
 902                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 903                 .procname       = "overcommit_memory",
 904                 .data           = &sysctl_overcommit_memory,
 905                 .maxlen         = sizeof(sysctl_overcommit_memory),
 906                 .mode           = 0644,
 907                 .proc_handler   = &proc_dointvec,
 908         },
 909         {
 910                 .ctl_name       = VM_PANIC_ON_OOM,
 911                 .procname       = "panic_on_oom",
 912                 .data           = &sysctl_panic_on_oom,
 913                 .maxlen         = sizeof(sysctl_panic_on_oom),
 914                 .mode           = 0644,
 915                 .proc_handler   = &proc_dointvec,
 916         },
 917         {
 918                 .ctl_name       = CTL_UNNUMBERED,
 919                 .procname       = "oom_kill_allocating_task",
 920                 .data           = &sysctl_oom_kill_allocating_task,
 921                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 922                 .mode           = 0644,
 923                 .proc_handler   = &proc_dointvec,
 924         },
 925         {
 926                 .ctl_name       = CTL_UNNUMBERED,
 927                 .procname       = "oom_dump_tasks",
 928                 .data           = &sysctl_oom_dump_tasks,
 929                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 930                 .mode           = 0644,
 931                 .proc_handler   = &proc_dointvec,
 932         },
 933         {
 934                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 935                 .procname       = "overcommit_ratio",
 936                 .data           = &sysctl_overcommit_ratio,
 937                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 938                 .mode           = 0644,
 939                 .proc_handler   = &proc_dointvec,
 940         },
 941         {
 942                 .ctl_name       = VM_PAGE_CLUSTER,
 943                 .procname       = "page-cluster",
 944                 .data           = &page_cluster,
 945                 .maxlen         = sizeof(int),
 946                 .mode           = 0644,
 947                 .proc_handler   = &proc_dointvec,
 948         },
 949         {
 950                 .ctl_name       = VM_DIRTY_BACKGROUND,
 951                 .procname       = "dirty_background_ratio",
 952                 .data           = &dirty_background_ratio,
 953                 .maxlen         = sizeof(dirty_background_ratio),
 954                 .mode           = 0644,
 955                 .proc_handler   = &dirty_background_ratio_handler,
 956                 .strategy       = &sysctl_intvec,
 957                 .extra1         = &zero,
 958                 .extra2         = &one_hundred,
 959         },
 960         {
 961                 .ctl_name       = CTL_UNNUMBERED,
 962                 .procname       = "dirty_background_bytes",
 963                 .data           = &dirty_background_bytes,
 964                 .maxlen         = sizeof(dirty_background_bytes),
 965                 .mode           = 0644,
 966                 .proc_handler   = &dirty_background_bytes_handler,
 967                 .strategy       = &sysctl_intvec,
 968                 .extra1         = &one,
 969         },
 970         {
 971                 .ctl_name       = VM_DIRTY_RATIO,
 972                 .procname       = "dirty_ratio",
 973                 .data           = &vm_dirty_ratio,
 974                 .maxlen         = sizeof(vm_dirty_ratio),
 975                 .mode           = 0644,
 976                 .proc_handler   = &dirty_ratio_handler,
 977                 .strategy       = &sysctl_intvec,
 978                 .extra1         = &zero,
 979                 .extra2         = &one_hundred,
 980         },
 981         {
 982                 .ctl_name       = CTL_UNNUMBERED,
 983                 .procname       = "dirty_bytes",
 984                 .data           = &vm_dirty_bytes,
 985                 .maxlen         = sizeof(vm_dirty_bytes),
 986                 .mode           = 0644,
 987                 .proc_handler   = &dirty_bytes_handler,
 988                 .strategy       = &sysctl_intvec,
 989                 .extra1         = &one,
 990         },
 991         {
 992                 .procname       = "dirty_writeback_centisecs",
 993                 .data           = &dirty_writeback_interval,
 994                 .maxlen         = sizeof(dirty_writeback_interval),
 995                 .mode           = 0644,
 996                 .proc_handler   = &dirty_writeback_centisecs_handler,
 997         },
 998         {
 999                 .procname       = "dirty_expire_centisecs",
1000                 .data           = &dirty_expire_interval,
1001                 .maxlen         = sizeof(dirty_expire_interval),
1002                 .mode           = 0644,
1003                 .proc_handler   = &proc_dointvec_userhz_jiffies,
1004         },
1005         {
1006                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
1007                 .procname       = "nr_pdflush_threads",
1008                 .data           = &nr_pdflush_threads,
1009                 .maxlen         = sizeof nr_pdflush_threads,
1010                 .mode           = 0444 /* read-only*/,
1011                 .proc_handler   = &proc_dointvec,
1012         },
1013         {
1014                 .ctl_name       = VM_SWAPPINESS,
1015                 .procname       = "swappiness",
1016                 .data           = &vm_swappiness,
1017                 .maxlen         = sizeof(vm_swappiness),
1018                 .mode           = 0644,
1019                 .proc_handler   = &proc_dointvec_minmax,
1020                 .strategy       = &sysctl_intvec,
1021                 .extra1         = &zero,
1022                 .extra2         = &one_hundred,
1023         },
1024 #ifdef CONFIG_HUGETLB_PAGE
1025          {
1026                 .procname       = "nr_hugepages",
1027                 .data           = NULL,
1028                 .maxlen         = sizeof(unsigned long),
1029                 .mode           = 0644,
1030                 .proc_handler   = &hugetlb_sysctl_handler,
1031                 .extra1         = (void *)&hugetlb_zero,
1032                 .extra2         = (void *)&hugetlb_infinity,
1033          },
1034          {
1035                 .ctl_name       = VM_HUGETLB_GROUP,
1036                 .procname       = "hugetlb_shm_group",
1037                 .data           = &sysctl_hugetlb_shm_group,
1038                 .maxlen         = sizeof(gid_t),
1039                 .mode           = 0644,
1040                 .proc_handler   = &proc_dointvec,
1041          },
1042          {
1043                 .ctl_name       = CTL_UNNUMBERED,
1044                 .procname       = "hugepages_treat_as_movable",
1045                 .data           = &hugepages_treat_as_movable,
1046                 .maxlen         = sizeof(int),
1047                 .mode           = 0644,
1048                 .proc_handler   = &hugetlb_treat_movable_handler,
1049         },
1050         {
1051                 .ctl_name       = CTL_UNNUMBERED,
1052                 .procname       = "nr_overcommit_hugepages",
1053                 .data           = NULL,
1054                 .maxlen         = sizeof(unsigned long),
1055                 .mode           = 0644,
1056                 .proc_handler   = &hugetlb_overcommit_handler,
1057                 .extra1         = (void *)&hugetlb_zero,
1058                 .extra2         = (void *)&hugetlb_infinity,
1059         },
1060 #endif
1061         {
1062                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
1063                 .procname       = "lowmem_reserve_ratio",
1064                 .data           = &sysctl_lowmem_reserve_ratio,
1065                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1066                 .mode           = 0644,
1067                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1068                 .strategy       = &sysctl_intvec,
1069         },
1070         {
1071                 .ctl_name       = VM_DROP_PAGECACHE,
1072                 .procname       = "drop_caches",
1073                 .data           = &sysctl_drop_caches,
1074                 .maxlen         = sizeof(int),
1075                 .mode           = 0644,
1076                 .proc_handler   = drop_caches_sysctl_handler,
1077                 .strategy       = &sysctl_intvec,
1078         },
1079         {
1080                 .ctl_name       = VM_MIN_FREE_KBYTES,
1081                 .procname       = "min_free_kbytes",
1082                 .data           = &min_free_kbytes,
1083                 .maxlen         = sizeof(min_free_kbytes),
1084                 .mode           = 0644,
1085                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1086                 .strategy       = &sysctl_intvec,
1087                 .extra1         = &zero,
1088         },
1089         {
1090                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1091                 .procname       = "percpu_pagelist_fraction",
1092                 .data           = &percpu_pagelist_fraction,
1093                 .maxlen         = sizeof(percpu_pagelist_fraction),
1094                 .mode           = 0644,
1095                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1096                 .strategy       = &sysctl_intvec,
1097                 .extra1         = &min_percpu_pagelist_fract,
1098         },
1099 #ifdef CONFIG_MMU
1100         {
1101                 .ctl_name       = VM_MAX_MAP_COUNT,
1102                 .procname       = "max_map_count",
1103                 .data           = &sysctl_max_map_count,
1104                 .maxlen         = sizeof(sysctl_max_map_count),
1105                 .mode           = 0644,
1106                 .proc_handler   = &proc_dointvec
1107         },
1108 #else
1109         {
1110                 .ctl_name       = CTL_UNNUMBERED,
1111                 .procname       = "nr_trim_pages",
1112                 .data           = &sysctl_nr_trim_pages,
1113                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1114                 .mode           = 0644,
1115                 .proc_handler   = &proc_dointvec_minmax,
1116                 .strategy       = &sysctl_intvec,
1117                 .extra1         = &zero,
1118         },
1119 #endif
1120         {
1121                 .ctl_name       = VM_LAPTOP_MODE,
1122                 .procname       = "laptop_mode",
1123                 .data           = &laptop_mode,
1124                 .maxlen         = sizeof(laptop_mode),
1125                 .mode           = 0644,
1126                 .proc_handler   = &proc_dointvec_jiffies,
1127                 .strategy       = &sysctl_jiffies,
1128         },
1129         {
1130                 .ctl_name       = VM_BLOCK_DUMP,
1131                 .procname       = "block_dump",
1132                 .data           = &block_dump,
1133                 .maxlen         = sizeof(block_dump),
1134                 .mode           = 0644,
1135                 .proc_handler   = &proc_dointvec,
1136                 .strategy       = &sysctl_intvec,
1137                 .extra1         = &zero,
1138         },
1139         {
1140                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1141                 .procname       = "vfs_cache_pressure",
1142                 .data           = &sysctl_vfs_cache_pressure,
1143                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1144                 .mode           = 0644,
1145                 .proc_handler   = &proc_dointvec,
1146                 .strategy       = &sysctl_intvec,
1147                 .extra1         = &zero,
1148         },
1149 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1150         {
1151                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1152                 .procname       = "legacy_va_layout",
1153                 .data           = &sysctl_legacy_va_layout,
1154                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1155                 .mode           = 0644,
1156                 .proc_handler   = &proc_dointvec,
1157                 .strategy       = &sysctl_intvec,
1158                 .extra1         = &zero,
1159         },
1160 #endif
1161 #ifdef CONFIG_NUMA
1162         {
1163                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1164                 .procname       = "zone_reclaim_mode",
1165                 .data           = &zone_reclaim_mode,
1166                 .maxlen         = sizeof(zone_reclaim_mode),
1167                 .mode           = 0644,
1168                 .proc_handler   = &proc_dointvec,
1169                 .strategy       = &sysctl_intvec,
1170                 .extra1         = &zero,
1171         },
1172         {
1173                 .ctl_name       = VM_MIN_UNMAPPED,
1174                 .procname       = "min_unmapped_ratio",
1175                 .data           = &sysctl_min_unmapped_ratio,
1176                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1177                 .mode           = 0644,
1178                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1179                 .strategy       = &sysctl_intvec,
1180                 .extra1         = &zero,
1181                 .extra2         = &one_hundred,
1182         },
1183         {
1184                 .ctl_name       = VM_MIN_SLAB,
1185                 .procname       = "min_slab_ratio",
1186                 .data           = &sysctl_min_slab_ratio,
1187                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1188                 .mode           = 0644,
1189                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1190                 .strategy       = &sysctl_intvec,
1191                 .extra1         = &zero,
1192                 .extra2         = &one_hundred,
1193         },
1194 #endif
1195 #ifdef CONFIG_SMP
1196         {
1197                 .ctl_name       = CTL_UNNUMBERED,
1198                 .procname       = "stat_interval",
1199                 .data           = &sysctl_stat_interval,
1200                 .maxlen         = sizeof(sysctl_stat_interval),
1201                 .mode           = 0644,
1202                 .proc_handler   = &proc_dointvec_jiffies,
1203                 .strategy       = &sysctl_jiffies,
1204         },
1205 #endif
1206 #ifdef CONFIG_SECURITY
1207         {
1208                 .ctl_name       = CTL_UNNUMBERED,
1209                 .procname       = "mmap_min_addr",
1210                 .data           = &mmap_min_addr,
1211                 .maxlen         = sizeof(unsigned long),
1212                 .mode           = 0644,
1213                 .proc_handler   = &proc_doulongvec_minmax,
1214         },
1215 #endif
1216 #ifdef CONFIG_NUMA
1217         {
1218                 .ctl_name       = CTL_UNNUMBERED,
1219                 .procname       = "numa_zonelist_order",
1220                 .data           = &numa_zonelist_order,
1221                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1222                 .mode           = 0644,
1223                 .proc_handler   = &numa_zonelist_order_handler,
1224                 .strategy       = &sysctl_string,
1225         },
1226 #endif
1227 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1228    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1229         {
1230                 .ctl_name       = VM_VDSO_ENABLED,
1231                 .procname       = "vdso_enabled",
1232                 .data           = &vdso_enabled,
1233                 .maxlen         = sizeof(vdso_enabled),
1234                 .mode           = 0644,
1235                 .proc_handler   = &proc_dointvec,
1236                 .strategy       = &sysctl_intvec,
1237                 .extra1         = &zero,
1238         },
1239 #endif
1240 #ifdef CONFIG_HIGHMEM
1241         {
1242                 .ctl_name       = CTL_UNNUMBERED,
1243                 .procname       = "highmem_is_dirtyable",
1244                 .data           = &vm_highmem_is_dirtyable,
1245                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1246                 .mode           = 0644,
1247                 .proc_handler   = &proc_dointvec_minmax,
1248                 .strategy       = &sysctl_intvec,
1249                 .extra1         = &zero,
1250                 .extra2         = &one,
1251         },
1252 #endif
1253 /*
1254  * NOTE: do not add new entries to this table unless you have read
1255  * Documentation/sysctl/ctl_unnumbered.txt
1256  */
1257         { .ctl_name = 0 }
1258 };
1259
1260 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1261 static struct ctl_table binfmt_misc_table[] = {
1262         { .ctl_name = 0 }
1263 };
1264 #endif
1265
1266 static struct ctl_table fs_table[] = {
1267         {
1268                 .ctl_name       = FS_NRINODE,
1269                 .procname       = "inode-nr",
1270                 .data           = &inodes_stat,
1271                 .maxlen         = 2*sizeof(int),
1272                 .mode           = 0444,
1273                 .proc_handler   = &proc_dointvec,
1274         },
1275         {
1276                 .ctl_name       = FS_STATINODE,
1277                 .procname       = "inode-state",
1278                 .data           = &inodes_stat,
1279                 .maxlen         = 7*sizeof(int),
1280                 .mode           = 0444,
1281                 .proc_handler   = &proc_dointvec,
1282         },
1283         {
1284                 .procname       = "file-nr",
1285                 .data           = &files_stat,
1286                 .maxlen         = 3*sizeof(int),
1287                 .mode           = 0444,
1288                 .proc_handler   = &proc_nr_files,
1289         },
1290         {
1291                 .ctl_name       = FS_MAXFILE,
1292                 .procname       = "file-max",
1293                 .data           = &files_stat.max_files,
1294                 .maxlen         = sizeof(int),
1295                 .mode           = 0644,
1296                 .proc_handler   = &proc_dointvec,
1297         },
1298         {
1299                 .ctl_name       = CTL_UNNUMBERED,
1300                 .procname       = "nr_open",
1301                 .data           = &sysctl_nr_open,
1302                 .maxlen         = sizeof(int),
1303                 .mode           = 0644,
1304                 .proc_handler   = &proc_dointvec_minmax,
1305                 .extra1         = &sysctl_nr_open_min,
1306                 .extra2         = &sysctl_nr_open_max,
1307         },
1308         {
1309                 .ctl_name       = FS_DENTRY,
1310                 .procname       = "dentry-state",
1311                 .data           = &dentry_stat,
1312                 .maxlen         = 6*sizeof(int),
1313                 .mode           = 0444,
1314                 .proc_handler   = &proc_dointvec,
1315         },
1316         {
1317                 .ctl_name       = FS_OVERFLOWUID,
1318                 .procname       = "overflowuid",
1319                 .data           = &fs_overflowuid,
1320                 .maxlen         = sizeof(int),
1321                 .mode           = 0644,
1322                 .proc_handler   = &proc_dointvec_minmax,
1323                 .strategy       = &sysctl_intvec,
1324                 .extra1         = &minolduid,
1325                 .extra2         = &maxolduid,
1326         },
1327         {
1328                 .ctl_name       = FS_OVERFLOWGID,
1329                 .procname       = "overflowgid",
1330                 .data           = &fs_overflowgid,
1331                 .maxlen         = sizeof(int),
1332                 .mode           = 0644,
1333                 .proc_handler   = &proc_dointvec_minmax,
1334                 .strategy       = &sysctl_intvec,
1335                 .extra1         = &minolduid,
1336                 .extra2         = &maxolduid,
1337         },
1338 #ifdef CONFIG_FILE_LOCKING
1339         {
1340                 .ctl_name       = FS_LEASES,
1341                 .procname       = "leases-enable",
1342                 .data           = &leases_enable,
1343                 .maxlen         = sizeof(int),
1344                 .mode           = 0644,
1345                 .proc_handler   = &proc_dointvec,
1346         },
1347 #endif
1348 #ifdef CONFIG_DNOTIFY
1349         {
1350                 .ctl_name       = FS_DIR_NOTIFY,
1351                 .procname       = "dir-notify-enable",
1352                 .data           = &dir_notify_enable,
1353                 .maxlen         = sizeof(int),
1354                 .mode           = 0644,
1355                 .proc_handler   = &proc_dointvec,
1356         },
1357 #endif
1358 #ifdef CONFIG_MMU
1359 #ifdef CONFIG_FILE_LOCKING
1360         {
1361                 .ctl_name       = FS_LEASE_TIME,
1362                 .procname       = "lease-break-time",
1363                 .data           = &lease_break_time,
1364                 .maxlen         = sizeof(int),
1365                 .mode           = 0644,
1366                 .proc_handler   = &proc_dointvec_minmax,
1367                 .strategy       = &sysctl_intvec,
1368                 .extra1         = &zero,
1369                 .extra2         = &two,
1370         },
1371 #endif
1372 #ifdef CONFIG_AIO
1373         {
1374                 .procname       = "aio-nr",
1375                 .data           = &aio_nr,
1376                 .maxlen         = sizeof(aio_nr),
1377                 .mode           = 0444,
1378                 .proc_handler   = &proc_doulongvec_minmax,
1379         },
1380         {
1381                 .procname       = "aio-max-nr",
1382                 .data           = &aio_max_nr,
1383                 .maxlen         = sizeof(aio_max_nr),
1384                 .mode           = 0644,
1385                 .proc_handler   = &proc_doulongvec_minmax,
1386         },
1387 #endif /* CONFIG_AIO */
1388 #ifdef CONFIG_INOTIFY_USER
1389         {
1390                 .ctl_name       = FS_INOTIFY,
1391                 .procname       = "inotify",
1392                 .mode           = 0555,
1393                 .child          = inotify_table,
1394         },
1395 #endif
1396 #ifdef CONFIG_EPOLL
1397         {
1398                 .procname       = "epoll",
1399                 .mode           = 0555,
1400                 .child          = epoll_table,
1401         },
1402 #endif
1403 #endif
1404         {
1405                 .ctl_name       = KERN_SETUID_DUMPABLE,
1406                 .procname       = "suid_dumpable",
1407                 .data           = &suid_dumpable,
1408                 .maxlen         = sizeof(int),
1409                 .mode           = 0644,
1410                 .proc_handler   = &proc_dointvec,
1411         },
1412 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1413         {
1414                 .ctl_name       = CTL_UNNUMBERED,
1415                 .procname       = "binfmt_misc",
1416                 .mode           = 0555,
1417                 .child          = binfmt_misc_table,
1418         },
1419 #endif
1420 /*
1421  * NOTE: do not add new entries to this table unless you have read
1422  * Documentation/sysctl/ctl_unnumbered.txt
1423  */
1424         { .ctl_name = 0 }
1425 };
1426
1427 static struct ctl_table debug_table[] = {
1428 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1429         {
1430                 .ctl_name       = CTL_UNNUMBERED,
1431                 .procname       = "exception-trace",
1432                 .data           = &show_unhandled_signals,
1433                 .maxlen         = sizeof(int),
1434                 .mode           = 0644,
1435                 .proc_handler   = proc_dointvec
1436         },
1437 #endif
1438         { .ctl_name = 0 }
1439 };
1440
1441 static struct ctl_table dev_table[] = {
1442         { .ctl_name = 0 }
1443 };
1444
1445 static DEFINE_SPINLOCK(sysctl_lock);
1446
1447 /* called under sysctl_lock */
1448 static int use_table(struct ctl_table_header *p)
1449 {
1450         if (unlikely(p->unregistering))
1451                 return 0;
1452         p->used++;
1453         return 1;
1454 }
1455
1456 /* called under sysctl_lock */
1457 static void unuse_table(struct ctl_table_header *p)
1458 {
1459         if (!--p->used)
1460                 if (unlikely(p->unregistering))
1461                         complete(p->unregistering);
1462 }
1463
1464 /* called under sysctl_lock, will reacquire if has to wait */
1465 static void start_unregistering(struct ctl_table_header *p)
1466 {
1467         /*
1468          * if p->used is 0, nobody will ever touch that entry again;
1469          * we'll eliminate all paths to it before dropping sysctl_lock
1470          */
1471         if (unlikely(p->used)) {
1472                 struct completion wait;
1473                 init_completion(&wait);
1474                 p->unregistering = &wait;
1475                 spin_unlock(&sysctl_lock);
1476                 wait_for_completion(&wait);
1477                 spin_lock(&sysctl_lock);
1478         } else {
1479                 /* anything non-NULL; we'll never dereference it */
1480                 p->unregistering = ERR_PTR(-EINVAL);
1481         }
1482         /*
1483          * do not remove from the list until nobody holds it; walking the
1484          * list in do_sysctl() relies on that.
1485          */
1486         list_del_init(&p->ctl_entry);
1487 }
1488
1489 void sysctl_head_get(struct ctl_table_header *head)
1490 {
1491         spin_lock(&sysctl_lock);
1492         head->count++;
1493         spin_unlock(&sysctl_lock);
1494 }
1495
1496 void sysctl_head_put(struct ctl_table_header *head)
1497 {
1498         spin_lock(&sysctl_lock);
1499         if (!--head->count)
1500                 kfree(head);
1501         spin_unlock(&sysctl_lock);
1502 }
1503
1504 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1505 {
1506         if (!head)
1507                 BUG();
1508         spin_lock(&sysctl_lock);
1509         if (!use_table(head))
1510                 head = ERR_PTR(-ENOENT);
1511         spin_unlock(&sysctl_lock);
1512         return head;
1513 }
1514
1515 void sysctl_head_finish(struct ctl_table_header *head)
1516 {
1517         if (!head)
1518                 return;
1519         spin_lock(&sysctl_lock);
1520         unuse_table(head);
1521         spin_unlock(&sysctl_lock);
1522 }
1523
1524 static struct ctl_table_set *
1525 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1526 {
1527         struct ctl_table_set *set = &root->default_set;
1528         if (root->lookup)
1529                 set = root->lookup(root, namespaces);
1530         return set;
1531 }
1532
1533 static struct list_head *
1534 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1535 {
1536         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1537         return &set->list;
1538 }
1539
1540 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1541                                             struct ctl_table_header *prev)
1542 {
1543         struct ctl_table_root *root;
1544         struct list_head *header_list;
1545         struct ctl_table_header *head;
1546         struct list_head *tmp;
1547
1548         spin_lock(&sysctl_lock);
1549         if (prev) {
1550                 head = prev;
1551                 tmp = &prev->ctl_entry;
1552                 unuse_table(prev);
1553                 goto next;
1554         }
1555         tmp = &root_table_header.ctl_entry;
1556         for (;;) {
1557                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1558
1559                 if (!use_table(head))
1560                         goto next;
1561                 spin_unlock(&sysctl_lock);
1562                 return head;
1563         next:
1564                 root = head->root;
1565                 tmp = tmp->next;
1566                 header_list = lookup_header_list(root, namespaces);
1567                 if (tmp != header_list)
1568                         continue;
1569
1570                 do {
1571                         root = list_entry(root->root_list.next,
1572                                         struct ctl_table_root, root_list);
1573                         if (root == &sysctl_table_root)
1574                                 goto out;
1575                         header_list = lookup_header_list(root, namespaces);
1576                 } while (list_empty(header_list));
1577                 tmp = header_list->next;
1578         }
1579 out:
1580         spin_unlock(&sysctl_lock);
1581         return NULL;
1582 }
1583
1584 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1585 {
1586         return __sysctl_head_next(current->nsproxy, prev);
1587 }
1588
1589 void register_sysctl_root(struct ctl_table_root *root)
1590 {
1591         spin_lock(&sysctl_lock);
1592         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1593         spin_unlock(&sysctl_lock);
1594 }
1595
1596 #ifdef CONFIG_SYSCTL_SYSCALL
1597 /* Perform the actual read/write of a sysctl table entry. */
1598 static int do_sysctl_strategy(struct ctl_table_root *root,
1599                         struct ctl_table *table,
1600                         void __user *oldval, size_t __user *oldlenp,
1601                         void __user *newval, size_t newlen)
1602 {
1603         int op = 0, rc;
1604
1605         if (oldval)
1606                 op |= MAY_READ;
1607         if (newval)
1608                 op |= MAY_WRITE;
1609         if (sysctl_perm(root, table, op))
1610                 return -EPERM;
1611
1612         if (table->strategy) {
1613                 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1614                 if (rc < 0)
1615                         return rc;
1616                 if (rc > 0)
1617                         return 0;
1618         }
1619
1620         /* If there is no strategy routine, or if the strategy returns
1621          * zero, proceed with automatic r/w */
1622         if (table->data && table->maxlen) {
1623                 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1624                 if (rc < 0)
1625                         return rc;
1626         }
1627         return 0;
1628 }
1629
1630 static int parse_table(int __user *name, int nlen,
1631                        void __user *oldval, size_t __user *oldlenp,
1632                        void __user *newval, size_t newlen,
1633                        struct ctl_table_root *root,
1634                        struct ctl_table *table)
1635 {
1636         int n;
1637 repeat:
1638         if (!nlen)
1639                 return -ENOTDIR;
1640         if (get_user(n, name))
1641                 return -EFAULT;
1642         for ( ; table->ctl_name || table->procname; table++) {
1643                 if (!table->ctl_name)
1644                         continue;
1645                 if (n == table->ctl_name) {
1646                         int error;
1647                         if (table->child) {
1648                                 if (sysctl_perm(root, table, MAY_EXEC))
1649                                         return -EPERM;
1650                                 name++;
1651                                 nlen--;
1652                                 table = table->child;
1653                                 goto repeat;
1654                         }
1655                         error = do_sysctl_strategy(root, table,
1656                                                    oldval, oldlenp,
1657                                                    newval, newlen);
1658                         return error;
1659                 }
1660         }
1661         return -ENOTDIR;
1662 }
1663
1664 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1665                void __user *newval, size_t newlen)
1666 {
1667         struct ctl_table_header *head;
1668         int error = -ENOTDIR;
1669
1670         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1671                 return -ENOTDIR;
1672         if (oldval) {
1673                 int old_len;
1674                 if (!oldlenp || get_user(old_len, oldlenp))
1675                         return -EFAULT;
1676         }
1677
1678         for (head = sysctl_head_next(NULL); head;
1679                         head = sysctl_head_next(head)) {
1680                 error = parse_table(name, nlen, oldval, oldlenp,
1681                                         newval, newlen,
1682                                         head->root, head->ctl_table);
1683                 if (error != -ENOTDIR) {
1684                         sysctl_head_finish(head);
1685                         break;
1686                 }
1687         }
1688         return error;
1689 }
1690
1691 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1692 {
1693         struct __sysctl_args tmp;
1694         int error;
1695
1696         if (copy_from_user(&tmp, args, sizeof(tmp)))
1697                 return -EFAULT;
1698
1699         error = deprecated_sysctl_warning(&tmp);
1700         if (error)
1701                 goto out;
1702
1703         lock_kernel();
1704         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1705                           tmp.newval, tmp.newlen);
1706         unlock_kernel();
1707 out:
1708         return error;
1709 }
1710 #endif /* CONFIG_SYSCTL_SYSCALL */
1711
1712 /*
1713  * sysctl_perm does NOT grant the superuser all rights automatically, because
1714  * some sysctl variables are readonly even to root.
1715  */
1716
1717 static int test_perm(int mode, int op)
1718 {
1719         if (!current_euid())
1720                 mode >>= 6;
1721         else if (in_egroup_p(0))
1722                 mode >>= 3;
1723         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1724                 return 0;
1725         return -EACCES;
1726 }
1727
1728 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1729 {
1730         int error;
1731         int mode;
1732
1733         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1734         if (error)
1735                 return error;
1736
1737         if (root->permissions)
1738                 mode = root->permissions(root, current->nsproxy, table);
1739         else
1740                 mode = table->mode;
1741
1742         return test_perm(mode, op);
1743 }
1744
1745 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1746 {
1747         for (; table->ctl_name || table->procname; table++) {
1748                 table->parent = parent;
1749                 if (table->child)
1750                         sysctl_set_parent(table, table->child);
1751         }
1752 }
1753
1754 static __init int sysctl_init(void)
1755 {
1756         sysctl_set_parent(NULL, root_table);
1757 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1758         {
1759                 int err;
1760                 err = sysctl_check_table(current->nsproxy, root_table);
1761         }
1762 #endif
1763         return 0;
1764 }
1765
1766 core_initcall(sysctl_init);
1767
1768 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1769                                       struct ctl_table *table)
1770 {
1771         struct ctl_table *p;
1772         const char *s = branch->procname;
1773
1774         /* branch should have named subdirectory as its first element */
1775         if (!s || !branch->child)
1776                 return NULL;
1777
1778         /* ... and nothing else */
1779         if (branch[1].procname || branch[1].ctl_name)
1780                 return NULL;
1781
1782         /* table should contain subdirectory with the same name */
1783         for (p = table; p->procname || p->ctl_name; p++) {
1784                 if (!p->child)
1785                         continue;
1786                 if (p->procname && strcmp(p->procname, s) == 0)
1787                         return p;
1788         }
1789         return NULL;
1790 }
1791
1792 /* see if attaching q to p would be an improvement */
1793 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1794 {
1795         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1796         struct ctl_table *next;
1797         int is_better = 0;
1798         int not_in_parent = !p->attached_by;
1799
1800         while ((next = is_branch_in(by, to)) != NULL) {
1801                 if (by == q->attached_by)
1802                         is_better = 1;
1803                 if (to == p->attached_by)
1804                         not_in_parent = 1;
1805                 by = by->child;
1806                 to = next->child;
1807         }
1808
1809         if (is_better && not_in_parent) {
1810                 q->attached_by = by;
1811                 q->attached_to = to;
1812                 q->parent = p;
1813         }
1814 }
1815
1816 /**
1817  * __register_sysctl_paths - register a sysctl hierarchy
1818  * @root: List of sysctl headers to register on
1819  * @namespaces: Data to compute which lists of sysctl entries are visible
1820  * @path: The path to the directory the sysctl table is in.
1821  * @table: the top-level table structure
1822  *
1823  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1824  * array. A completely 0 filled entry terminates the table.
1825  *
1826  * The members of the &struct ctl_table structure are used as follows:
1827  *
1828  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1829  *            must be unique within that level of sysctl
1830  *
1831  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1832  *            enter a sysctl file
1833  *
1834  * data - a pointer to data for use by proc_handler
1835  *
1836  * maxlen - the maximum size in bytes of the data
1837  *
1838  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1839  *
1840  * child - a pointer to the child sysctl table if this entry is a directory, or
1841  *         %NULL.
1842  *
1843  * proc_handler - the text handler routine (described below)
1844  *
1845  * strategy - the strategy routine (described below)
1846  *
1847  * de - for internal use by the sysctl routines
1848  *
1849  * extra1, extra2 - extra pointers usable by the proc handler routines
1850  *
1851  * Leaf nodes in the sysctl tree will be represented by a single file
1852  * under /proc; non-leaf nodes will be represented by directories.
1853  *
1854  * sysctl(2) can automatically manage read and write requests through
1855  * the sysctl table.  The data and maxlen fields of the ctl_table
1856  * struct enable minimal validation of the values being written to be
1857  * performed, and the mode field allows minimal authentication.
1858  *
1859  * More sophisticated management can be enabled by the provision of a
1860  * strategy routine with the table entry.  This will be called before
1861  * any automatic read or write of the data is performed.
1862  *
1863  * The strategy routine may return
1864  *
1865  * < 0 - Error occurred (error is passed to user process)
1866  *
1867  * 0   - OK - proceed with automatic read or write.
1868  *
1869  * > 0 - OK - read or write has been done by the strategy routine, so
1870  *       return immediately.
1871  *
1872  * There must be a proc_handler routine for any terminal nodes
1873  * mirrored under /proc/sys (non-terminals are handled by a built-in
1874  * directory handler).  Several default handlers are available to
1875  * cover common cases -
1876  *
1877  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1878  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1879  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1880  *
1881  * It is the handler's job to read the input buffer from user memory
1882  * and process it. The handler should return 0 on success.
1883  *
1884  * This routine returns %NULL on a failure to register, and a pointer
1885  * to the table header on success.
1886  */
1887 struct ctl_table_header *__register_sysctl_paths(
1888         struct ctl_table_root *root,
1889         struct nsproxy *namespaces,
1890         const struct ctl_path *path, struct ctl_table *table)
1891 {
1892         struct ctl_table_header *header;
1893         struct ctl_table *new, **prevp;
1894         unsigned int n, npath;
1895         struct ctl_table_set *set;
1896
1897         /* Count the path components */
1898         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1899                 ;
1900
1901         /*
1902          * For each path component, allocate a 2-element ctl_table array.
1903          * The first array element will be filled with the sysctl entry
1904          * for this, the second will be the sentinel (ctl_name == 0).
1905          *
1906          * We allocate everything in one go so that we don't have to
1907          * worry about freeing additional memory in unregister_sysctl_table.
1908          */
1909         header = kzalloc(sizeof(struct ctl_table_header) +
1910                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1911         if (!header)
1912                 return NULL;
1913
1914         new = (struct ctl_table *) (header + 1);
1915
1916         /* Now connect the dots */
1917         prevp = &header->ctl_table;
1918         for (n = 0; n < npath; ++n, ++path) {
1919                 /* Copy the procname */
1920                 new->procname = path->procname;
1921                 new->ctl_name = path->ctl_name;
1922                 new->mode     = 0555;
1923
1924                 *prevp = new;
1925                 prevp = &new->child;
1926
1927                 new += 2;
1928         }
1929         *prevp = table;
1930         header->ctl_table_arg = table;
1931
1932         INIT_LIST_HEAD(&header->ctl_entry);
1933         header->used = 0;
1934         header->unregistering = NULL;
1935         header->root = root;
1936         sysctl_set_parent(NULL, header->ctl_table);
1937         header->count = 1;
1938 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1939         if (sysctl_check_table(namespaces, header->ctl_table)) {
1940                 kfree(header);
1941                 return NULL;
1942         }
1943 #endif
1944         spin_lock(&sysctl_lock);
1945         header->set = lookup_header_set(root, namespaces);
1946         header->attached_by = header->ctl_table;
1947         header->attached_to = root_table;
1948         header->parent = &root_table_header;
1949         for (set = header->set; set; set = set->parent) {
1950                 struct ctl_table_header *p;
1951                 list_for_each_entry(p, &set->list, ctl_entry) {
1952                         if (p->unregistering)
1953                                 continue;
1954                         try_attach(p, header);
1955                 }
1956         }
1957         header->parent->count++;
1958         list_add_tail(&header->ctl_entry, &header->set->list);
1959         spin_unlock(&sysctl_lock);
1960
1961         return header;
1962 }
1963
1964 /**
1965  * register_sysctl_table_path - register a sysctl table hierarchy
1966  * @path: The path to the directory the sysctl table is in.
1967  * @table: the top-level table structure
1968  *
1969  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1970  * array. A completely 0 filled entry terminates the table.
1971  *
1972  * See __register_sysctl_paths for more details.
1973  */
1974 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1975                                                 struct ctl_table *table)
1976 {
1977         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1978                                         path, table);
1979 }
1980
1981 /**
1982  * register_sysctl_table - register a sysctl table hierarchy
1983  * @table: the top-level table structure
1984  *
1985  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1986  * array. A completely 0 filled entry terminates the table.
1987  *
1988  * See register_sysctl_paths for more details.
1989  */
1990 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1991 {
1992         static const struct ctl_path null_path[] = { {} };
1993
1994         return register_sysctl_paths(null_path, table);
1995 }
1996
1997 /**
1998  * unregister_sysctl_table - unregister a sysctl table hierarchy
1999  * @header: the header returned from register_sysctl_table
2000  *
2001  * Unregisters the sysctl table and all children. proc entries may not
2002  * actually be removed until they are no longer used by anyone.
2003  */
2004 void unregister_sysctl_table(struct ctl_table_header * header)
2005 {
2006         might_sleep();
2007
2008         if (header == NULL)
2009                 return;
2010
2011         spin_lock(&sysctl_lock);
2012         start_unregistering(header);
2013         if (!--header->parent->count) {
2014                 WARN_ON(1);
2015                 kfree(header->parent);
2016         }
2017         if (!--header->count)
2018                 kfree(header);
2019         spin_unlock(&sysctl_lock);
2020 }
2021
2022 int sysctl_is_seen(struct ctl_table_header *p)
2023 {
2024         struct ctl_table_set *set = p->set;
2025         int res;
2026         spin_lock(&sysctl_lock);
2027         if (p->unregistering)
2028                 res = 0;
2029         else if (!set->is_seen)
2030                 res = 1;
2031         else
2032                 res = set->is_seen(set);
2033         spin_unlock(&sysctl_lock);
2034         return res;
2035 }
2036
2037 void setup_sysctl_set(struct ctl_table_set *p,
2038         struct ctl_table_set *parent,
2039         int (*is_seen)(struct ctl_table_set *))
2040 {
2041         INIT_LIST_HEAD(&p->list);
2042         p->parent = parent ? parent : &sysctl_table_root.default_set;
2043         p->is_seen = is_seen;
2044 }
2045
2046 #else /* !CONFIG_SYSCTL */
2047 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2048 {
2049         return NULL;
2050 }
2051
2052 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2053                                                     struct ctl_table *table)
2054 {
2055         return NULL;
2056 }
2057
2058 void unregister_sysctl_table(struct ctl_table_header * table)
2059 {
2060 }
2061
2062 void setup_sysctl_set(struct ctl_table_set *p,
2063         struct ctl_table_set *parent,
2064         int (*is_seen)(struct ctl_table_set *))
2065 {
2066 }
2067
2068 void sysctl_head_put(struct ctl_table_header *head)
2069 {
2070 }
2071
2072 #endif /* CONFIG_SYSCTL */
2073
2074 /*
2075  * /proc/sys support
2076  */
2077
2078 #ifdef CONFIG_PROC_SYSCTL
2079
2080 static int _proc_do_string(void* data, int maxlen, int write,
2081                            struct file *filp, void __user *buffer,
2082                            size_t *lenp, loff_t *ppos)
2083 {
2084         size_t len;
2085         char __user *p;
2086         char c;
2087
2088         if (!data || !maxlen || !*lenp) {
2089                 *lenp = 0;
2090                 return 0;
2091         }
2092
2093         if (write) {
2094                 len = 0;
2095                 p = buffer;
2096                 while (len < *lenp) {
2097                         if (get_user(c, p++))
2098                                 return -EFAULT;
2099                         if (c == 0 || c == '\n')
2100                                 break;
2101                         len++;
2102                 }
2103                 if (len >= maxlen)
2104                         len = maxlen-1;
2105                 if(copy_from_user(data, buffer, len))
2106                         return -EFAULT;
2107                 ((char *) data)[len] = 0;
2108                 *ppos += *lenp;
2109         } else {
2110                 len = strlen(data);
2111                 if (len > maxlen)
2112                         len = maxlen;
2113
2114                 if (*ppos > len) {
2115                         *lenp = 0;
2116                         return 0;
2117                 }
2118
2119                 data += *ppos;
2120                 len  -= *ppos;
2121
2122                 if (len > *lenp)
2123                         len = *lenp;
2124                 if (len)
2125                         if(copy_to_user(buffer, data, len))
2126                                 return -EFAULT;
2127                 if (len < *lenp) {
2128                         if(put_user('\n', ((char __user *) buffer) + len))
2129                                 return -EFAULT;
2130                         len++;
2131                 }
2132                 *lenp = len;
2133                 *ppos += len;
2134         }
2135         return 0;
2136 }
2137
2138 /**
2139  * proc_dostring - read a string sysctl
2140  * @table: the sysctl table
2141  * @write: %TRUE if this is a write to the sysctl file
2142  * @filp: the file structure
2143  * @buffer: the user buffer
2144  * @lenp: the size of the user buffer
2145  * @ppos: file position
2146  *
2147  * Reads/writes a string from/to the user buffer. If the kernel
2148  * buffer provided is not large enough to hold the string, the
2149  * string is truncated. The copied string is %NULL-terminated.
2150  * If the string is being read by the user process, it is copied
2151  * and a newline '\n' is added. It is truncated if the buffer is
2152  * not large enough.
2153  *
2154  * Returns 0 on success.
2155  */
2156 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2157                   void __user *buffer, size_t *lenp, loff_t *ppos)
2158 {
2159         return _proc_do_string(table->data, table->maxlen, write, filp,
2160                                buffer, lenp, ppos);
2161 }
2162
2163
2164 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2165                                  int *valp,
2166                                  int write, void *data)
2167 {
2168         if (write) {
2169                 *valp = *negp ? -*lvalp : *lvalp;
2170         } else {
2171                 int val = *valp;
2172                 if (val < 0) {
2173                         *negp = -1;
2174                         *lvalp = (unsigned long)-val;
2175                 } else {
2176                         *negp = 0;
2177                         *lvalp = (unsigned long)val;
2178                 }
2179         }
2180         return 0;
2181 }
2182
2183 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2184                   int write, struct file *filp, void __user *buffer,
2185                   size_t *lenp, loff_t *ppos,
2186                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2187                               int write, void *data),
2188                   void *data)
2189 {
2190 #define TMPBUFLEN 21
2191         int *i, vleft, first=1, neg, val;
2192         unsigned long lval;
2193         size_t left, len;
2194
2195         char buf[TMPBUFLEN], *p;
2196         char __user *s = buffer;
2197
2198         if (!tbl_data || !table->maxlen || !*lenp ||
2199             (*ppos && !write)) {
2200                 *lenp = 0;
2201                 return 0;
2202         }
2203
2204         i = (int *) tbl_data;
2205         vleft = table->maxlen / sizeof(*i);
2206         left = *lenp;
2207
2208         if (!conv)
2209                 conv = do_proc_dointvec_conv;
2210
2211         for (; left && vleft--; i++, first=0) {
2212                 if (write) {
2213                         while (left) {
2214                                 char c;
2215                                 if (get_user(c, s))
2216                                         return -EFAULT;
2217                                 if (!isspace(c))
2218                                         break;
2219                                 left--;
2220                                 s++;
2221                         }
2222                         if (!left)
2223                                 break;
2224                         neg = 0;
2225                         len = left;
2226                         if (len > sizeof(buf) - 1)
2227                                 len = sizeof(buf) - 1;
2228                         if (copy_from_user(buf, s, len))
2229                                 return -EFAULT;
2230                         buf[len] = 0;
2231                         p = buf;
2232                         if (*p == '-' && left > 1) {
2233                                 neg = 1;
2234                                 p++;
2235                         }
2236                         if (*p < '0' || *p > '9')
2237                                 break;
2238
2239                         lval = simple_strtoul(p, &p, 0);
2240
2241                         len = p-buf;
2242                         if ((len < left) && *p && !isspace(*p))
2243                                 break;
2244                         if (neg)
2245                                 val = -val;
2246                         s += len;
2247                         left -= len;
2248
2249                         if (conv(&neg, &lval, i, 1, data))
2250                                 break;
2251                 } else {
2252                         p = buf;
2253                         if (!first)
2254                                 *p++ = '\t';
2255
2256                         if (conv(&neg, &lval, i, 0, data))
2257                                 break;
2258
2259                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2260                         len = strlen(buf);
2261                         if (len > left)
2262                                 len = left;
2263                         if(copy_to_user(s, buf, len))
2264                                 return -EFAULT;
2265                         left -= len;
2266                         s += len;
2267                 }
2268         }
2269
2270         if (!write && !first && left) {
2271                 if(put_user('\n', s))
2272                         return -EFAULT;
2273                 left--, s++;
2274         }
2275         if (write) {
2276                 while (left) {
2277                         char c;
2278                         if (get_user(c, s++))
2279                                 return -EFAULT;
2280                         if (!isspace(c))
2281                                 break;
2282                         left--;
2283                 }
2284         }
2285         if (write && first)
2286                 return -EINVAL;
2287         *lenp -= left;
2288         *ppos += *lenp;
2289         return 0;
2290 #undef TMPBUFLEN
2291 }
2292
2293 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2294                   void __user *buffer, size_t *lenp, loff_t *ppos,
2295                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2296                               int write, void *data),
2297                   void *data)
2298 {
2299         return __do_proc_dointvec(table->data, table, write, filp,
2300                         buffer, lenp, ppos, conv, data);
2301 }
2302
2303 /**
2304  * proc_dointvec - read a vector of integers
2305  * @table: the sysctl table
2306  * @write: %TRUE if this is a write to the sysctl file
2307  * @filp: the file structure
2308  * @buffer: the user buffer
2309  * @lenp: the size of the user buffer
2310  * @ppos: file position
2311  *
2312  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2313  * values from/to the user buffer, treated as an ASCII string.
2314  *
2315  * Returns 0 on success.
2316  */
2317 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2318                      void __user *buffer, size_t *lenp, loff_t *ppos)
2319 {
2320     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2321                             NULL,NULL);
2322 }
2323
2324 /*
2325  * Taint values can only be increased
2326  * This means we can safely use a temporary.
2327  */
2328 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2329                                void __user *buffer, size_t *lenp, loff_t *ppos)
2330 {
2331         struct ctl_table t;
2332         unsigned long tmptaint = get_taint();
2333         int err;
2334
2335         if (write && !capable(CAP_SYS_ADMIN))
2336                 return -EPERM;
2337
2338         t = *table;
2339         t.data = &tmptaint;
2340         err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2341         if (err < 0)
2342                 return err;
2343
2344         if (write) {
2345                 /*
2346                  * Poor man's atomic or. Not worth adding a primitive
2347                  * to everyone's atomic.h for this
2348                  */
2349                 int i;
2350                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2351                         if ((tmptaint >> i) & 1)
2352                                 add_taint(i);
2353                 }
2354         }
2355
2356         return err;
2357 }
2358
2359 struct do_proc_dointvec_minmax_conv_param {
2360         int *min;
2361         int *max;
2362 };
2363
2364 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2365                                         int *valp,
2366                                         int write, void *data)
2367 {
2368         struct do_proc_dointvec_minmax_conv_param *param = data;
2369         if (write) {
2370                 int val = *negp ? -*lvalp : *lvalp;
2371                 if ((param->min && *param->min > val) ||
2372                     (param->max && *param->max < val))
2373                         return -EINVAL;
2374                 *valp = val;
2375         } else {
2376                 int val = *valp;
2377                 if (val < 0) {
2378                         *negp = -1;
2379                         *lvalp = (unsigned long)-val;
2380                 } else {
2381                         *negp = 0;
2382                         *lvalp = (unsigned long)val;
2383                 }
2384         }
2385         return 0;
2386 }
2387
2388 /**
2389  * proc_dointvec_minmax - read a vector of integers with min/max values
2390  * @table: the sysctl table
2391  * @write: %TRUE if this is a write to the sysctl file
2392  * @filp: the file structure
2393  * @buffer: the user buffer
2394  * @lenp: the size of the user buffer
2395  * @ppos: file position
2396  *
2397  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2398  * values from/to the user buffer, treated as an ASCII string.
2399  *
2400  * This routine will ensure the values are within the range specified by
2401  * table->extra1 (min) and table->extra2 (max).
2402  *
2403  * Returns 0 on success.
2404  */
2405 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2406                   void __user *buffer, size_t *lenp, loff_t *ppos)
2407 {
2408         struct do_proc_dointvec_minmax_conv_param param = {
2409                 .min = (int *) table->extra1,
2410                 .max = (int *) table->extra2,
2411         };
2412         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2413                                 do_proc_dointvec_minmax_conv, &param);
2414 }
2415
2416 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2417                                      struct file *filp,
2418                                      void __user *buffer,
2419                                      size_t *lenp, loff_t *ppos,
2420                                      unsigned long convmul,
2421                                      unsigned long convdiv)
2422 {
2423 #define TMPBUFLEN 21
2424         unsigned long *i, *min, *max, val;
2425         int vleft, first=1, neg;
2426         size_t len, left;
2427         char buf[TMPBUFLEN], *p;
2428         char __user *s = buffer;
2429
2430         if (!data || !table->maxlen || !*lenp ||
2431             (*ppos && !write)) {
2432                 *lenp = 0;
2433                 return 0;
2434         }
2435
2436         i = (unsigned long *) data;
2437         min = (unsigned long *) table->extra1;
2438         max = (unsigned long *) table->extra2;
2439         vleft = table->maxlen / sizeof(unsigned long);
2440         left = *lenp;
2441
2442         for (; left && vleft--; i++, min++, max++, first=0) {
2443                 if (write) {
2444                         while (left) {
2445                                 char c;
2446                                 if (get_user(c, s))
2447                                         return -EFAULT;
2448                                 if (!isspace(c))
2449                                         break;
2450                                 left--;
2451                                 s++;
2452                         }
2453                         if (!left)
2454                                 break;
2455                         neg = 0;
2456                         len = left;
2457                         if (len > TMPBUFLEN-1)
2458                                 len = TMPBUFLEN-1;
2459                         if (copy_from_user(buf, s, len))
2460                                 return -EFAULT;
2461                         buf[len] = 0;
2462                         p = buf;
2463                         if (*p == '-' && left > 1) {
2464                                 neg = 1;
2465                                 p++;
2466                         }
2467                         if (*p < '0' || *p > '9')
2468                                 break;
2469                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2470                         len = p-buf;
2471                         if ((len < left) && *p && !isspace(*p))
2472                                 break;
2473                         if (neg)
2474                                 val = -val;
2475                         s += len;
2476                         left -= len;
2477
2478                         if(neg)
2479                                 continue;
2480                         if ((min && val < *min) || (max && val > *max))
2481                                 continue;
2482                         *i = val;
2483                 } else {
2484                         p = buf;
2485                         if (!first)
2486                                 *p++ = '\t';
2487                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2488                         len = strlen(buf);
2489                         if (len > left)
2490                                 len = left;
2491                         if(copy_to_user(s, buf, len))
2492                                 return -EFAULT;
2493                         left -= len;
2494                         s += len;
2495                 }
2496         }
2497
2498         if (!write && !first && left) {
2499                 if(put_user('\n', s))
2500                         return -EFAULT;
2501                 left--, s++;
2502         }
2503         if (write) {
2504                 while (left) {
2505                         char c;
2506                         if (get_user(c, s++))
2507                                 return -EFAULT;
2508                         if (!isspace(c))
2509                                 break;
2510                         left--;
2511                 }
2512         }
2513         if (write && first)
2514                 return -EINVAL;
2515         *lenp -= left;
2516         *ppos += *lenp;
2517         return 0;
2518 #undef TMPBUFLEN
2519 }
2520
2521 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2522                                      struct file *filp,
2523                                      void __user *buffer,
2524                                      size_t *lenp, loff_t *ppos,
2525                                      unsigned long convmul,
2526                                      unsigned long convdiv)
2527 {
2528         return __do_proc_doulongvec_minmax(table->data, table, write,
2529                         filp, buffer, lenp, ppos, convmul, convdiv);
2530 }
2531
2532 /**
2533  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2534  * @table: the sysctl table
2535  * @write: %TRUE if this is a write to the sysctl file
2536  * @filp: the file structure
2537  * @buffer: the user buffer
2538  * @lenp: the size of the user buffer
2539  * @ppos: file position
2540  *
2541  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2542  * values from/to the user buffer, treated as an ASCII string.
2543  *
2544  * This routine will ensure the values are within the range specified by
2545  * table->extra1 (min) and table->extra2 (max).
2546  *
2547  * Returns 0 on success.
2548  */
2549 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2550                            void __user *buffer, size_t *lenp, loff_t *ppos)
2551 {
2552     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2553 }
2554
2555 /**
2556  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2557  * @table: the sysctl table
2558  * @write: %TRUE if this is a write to the sysctl file
2559  * @filp: the file structure
2560  * @buffer: the user buffer
2561  * @lenp: the size of the user buffer
2562  * @ppos: file position
2563  *
2564  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2565  * values from/to the user buffer, treated as an ASCII string. The values
2566  * are treated as milliseconds, and converted to jiffies when they are stored.
2567  *
2568  * This routine will ensure the values are within the range specified by
2569  * table->extra1 (min) and table->extra2 (max).
2570  *
2571  * Returns 0 on success.
2572  */
2573 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2574                                       struct file *filp,
2575                                       void __user *buffer,
2576                                       size_t *lenp, loff_t *ppos)
2577 {
2578     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2579                                      lenp, ppos, HZ, 1000l);
2580 }
2581
2582
2583 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2584                                          int *valp,
2585                                          int write, void *data)
2586 {
2587         if (write) {
2588                 if (*lvalp > LONG_MAX / HZ)
2589                         return 1;
2590                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2591         } else {
2592                 int val = *valp;
2593                 unsigned long lval;
2594                 if (val < 0) {
2595                         *negp = -1;
2596                         lval = (unsigned long)-val;
2597                 } else {
2598                         *negp = 0;
2599                         lval = (unsigned long)val;
2600                 }
2601                 *lvalp = lval / HZ;
2602         }
2603         return 0;
2604 }
2605
2606 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2607                                                 int *valp,
2608                                                 int write, void *data)
2609 {
2610         if (write) {
2611                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2612                         return 1;
2613                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2614         } else {
2615                 int val = *valp;
2616                 unsigned long lval;
2617                 if (val < 0) {
2618                         *negp = -1;
2619                         lval = (unsigned long)-val;
2620                 } else {
2621                         *negp = 0;
2622                         lval = (unsigned long)val;
2623                 }
2624                 *lvalp = jiffies_to_clock_t(lval);
2625         }
2626         return 0;
2627 }
2628
2629 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2630                                             int *valp,
2631                                             int write, void *data)
2632 {
2633         if (write) {
2634                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2635         } else {
2636                 int val = *valp;
2637                 unsigned long lval;
2638                 if (val < 0) {
2639                         *negp = -1;
2640                         lval = (unsigned long)-val;
2641                 } else {
2642                         *negp = 0;
2643                         lval = (unsigned long)val;
2644                 }
2645                 *lvalp = jiffies_to_msecs(lval);
2646         }
2647         return 0;
2648 }
2649
2650 /**
2651  * proc_dointvec_jiffies - read a vector of integers as seconds
2652  * @table: the sysctl table
2653  * @write: %TRUE if this is a write to the sysctl file
2654  * @filp: the file structure
2655  * @buffer: the user buffer
2656  * @lenp: the size of the user buffer
2657  * @ppos: file position
2658  *
2659  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2660  * values from/to the user buffer, treated as an ASCII string.
2661  * The values read are assumed to be in seconds, and are converted into
2662  * jiffies.
2663  *
2664  * Returns 0 on success.
2665  */
2666 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2667                           void __user *buffer, size_t *lenp, loff_t *ppos)
2668 {
2669     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2670                             do_proc_dointvec_jiffies_conv,NULL);
2671 }
2672
2673 /**
2674  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2675  * @table: the sysctl table
2676  * @write: %TRUE if this is a write to the sysctl file
2677  * @filp: the file structure
2678  * @buffer: the user buffer
2679  * @lenp: the size of the user buffer
2680  * @ppos: pointer to the file position
2681  *
2682  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2683  * values from/to the user buffer, treated as an ASCII string.
2684  * The values read are assumed to be in 1/USER_HZ seconds, and
2685  * are converted into jiffies.
2686  *
2687  * Returns 0 on success.
2688  */
2689 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2690                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2691 {
2692     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2693                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2694 }
2695
2696 /**
2697  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2698  * @table: the sysctl table
2699  * @write: %TRUE if this is a write to the sysctl file
2700  * @filp: the file structure
2701  * @buffer: the user buffer
2702  * @lenp: the size of the user buffer
2703  * @ppos: file position
2704  * @ppos: the current position in the file
2705  *
2706  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2707  * values from/to the user buffer, treated as an ASCII string.
2708  * The values read are assumed to be in 1/1000 seconds, and
2709  * are converted into jiffies.
2710  *
2711  * Returns 0 on success.
2712  */
2713 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2714                              void __user *buffer, size_t *lenp, loff_t *ppos)
2715 {
2716         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2717                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2718 }
2719
2720 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2721                            void __user *buffer, size_t *lenp, loff_t *ppos)
2722 {
2723         struct pid *new_pid;
2724         pid_t tmp;
2725         int r;
2726
2727         tmp = pid_vnr(cad_pid);
2728
2729         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2730                                lenp, ppos, NULL, NULL);
2731         if (r || !write)
2732                 return r;
2733
2734         new_pid = find_get_pid(tmp);
2735         if (!new_pid)
2736                 return -ESRCH;
2737
2738         put_pid(xchg(&cad_pid, new_pid));
2739         return 0;
2740 }
2741
2742 #else /* CONFIG_PROC_FS */
2743
2744 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2745                   void __user *buffer, size_t *lenp, loff_t *ppos)
2746 {
2747         return -ENOSYS;
2748 }
2749
2750 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2751                   void __user *buffer, size_t *lenp, loff_t *ppos)
2752 {
2753         return -ENOSYS;
2754 }
2755
2756 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2757                     void __user *buffer, size_t *lenp, loff_t *ppos)
2758 {
2759         return -ENOSYS;
2760 }
2761
2762 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2763                     void __user *buffer, size_t *lenp, loff_t *ppos)
2764 {
2765         return -ENOSYS;
2766 }
2767
2768 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2769                     void __user *buffer, size_t *lenp, loff_t *ppos)
2770 {
2771         return -ENOSYS;
2772 }
2773
2774 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2775                              void __user *buffer, size_t *lenp, loff_t *ppos)
2776 {
2777         return -ENOSYS;
2778 }
2779
2780 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2781                     void __user *buffer, size_t *lenp, loff_t *ppos)
2782 {
2783         return -ENOSYS;
2784 }
2785
2786 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2787                                       struct file *filp,
2788                                       void __user *buffer,
2789                                       size_t *lenp, loff_t *ppos)
2790 {
2791     return -ENOSYS;
2792 }
2793
2794
2795 #endif /* CONFIG_PROC_FS */
2796
2797
2798 #ifdef CONFIG_SYSCTL_SYSCALL
2799 /*
2800  * General sysctl support routines
2801  */
2802
2803 /* The generic sysctl data routine (used if no strategy routine supplied) */
2804 int sysctl_data(struct ctl_table *table,
2805                 void __user *oldval, size_t __user *oldlenp,
2806                 void __user *newval, size_t newlen)
2807 {
2808         size_t len;
2809
2810         /* Get out of I don't have a variable */
2811         if (!table->data || !table->maxlen)
2812                 return -ENOTDIR;
2813
2814         if (oldval && oldlenp) {
2815                 if (get_user(len, oldlenp))
2816                         return -EFAULT;
2817                 if (len) {
2818                         if (len > table->maxlen)
2819                                 len = table->maxlen;
2820                         if (copy_to_user(oldval, table->data, len))
2821                                 return -EFAULT;
2822                         if (put_user(len, oldlenp))
2823                                 return -EFAULT;
2824                 }
2825         }
2826
2827         if (newval && newlen) {
2828                 if (newlen > table->maxlen)
2829                         newlen = table->maxlen;
2830
2831                 if (copy_from_user(table->data, newval, newlen))
2832                         return -EFAULT;
2833         }
2834         return 1;
2835 }
2836
2837 /* The generic string strategy routine: */
2838 int sysctl_string(struct ctl_table *table,
2839                   void __user *oldval, size_t __user *oldlenp,
2840                   void __user *newval, size_t newlen)
2841 {
2842         if (!table->data || !table->maxlen)
2843                 return -ENOTDIR;
2844
2845         if (oldval && oldlenp) {
2846                 size_t bufsize;
2847                 if (get_user(bufsize, oldlenp))
2848                         return -EFAULT;
2849                 if (bufsize) {
2850                         size_t len = strlen(table->data), copied;
2851
2852                         /* This shouldn't trigger for a well-formed sysctl */
2853                         if (len > table->maxlen)
2854                                 len = table->maxlen;
2855
2856                         /* Copy up to a max of bufsize-1 bytes of the string */
2857                         copied = (len >= bufsize) ? bufsize - 1 : len;
2858
2859                         if (copy_to_user(oldval, table->data, copied) ||
2860                             put_user(0, (char __user *)(oldval + copied)))
2861                                 return -EFAULT;
2862                         if (put_user(len, oldlenp))
2863                                 return -EFAULT;
2864                 }
2865         }
2866         if (newval && newlen) {
2867                 size_t len = newlen;
2868                 if (len > table->maxlen)
2869                         len = table->maxlen;
2870                 if(copy_from_user(table->data, newval, len))
2871                         return -EFAULT;
2872                 if (len == table->maxlen)
2873                         len--;
2874                 ((char *) table->data)[len] = 0;
2875         }
2876         return 1;
2877 }
2878
2879 /*
2880  * This function makes sure that all of the integers in the vector
2881  * are between the minimum and maximum values given in the arrays
2882  * table->extra1 and table->extra2, respectively.
2883  */
2884 int sysctl_intvec(struct ctl_table *table,
2885                 void __user *oldval, size_t __user *oldlenp,
2886                 void __user *newval, size_t newlen)
2887 {
2888
2889         if (newval && newlen) {
2890                 int __user *vec = (int __user *) newval;
2891                 int *min = (int *) table->extra1;
2892                 int *max = (int *) table->extra2;
2893                 size_t length;
2894                 int i;
2895
2896                 if (newlen % sizeof(int) != 0)
2897                         return -EINVAL;
2898
2899                 if (!table->extra1 && !table->extra2)
2900                         return 0;
2901
2902                 if (newlen > table->maxlen)
2903                         newlen = table->maxlen;
2904                 length = newlen / sizeof(int);
2905
2906                 for (i = 0; i < length; i++) {
2907                         int value;
2908                         if (get_user(value, vec + i))
2909                                 return -EFAULT;
2910                         if (min && value < min[i])
2911                                 return -EINVAL;
2912                         if (max && value > max[i])
2913                                 return -EINVAL;
2914                 }
2915         }
2916         return 0;
2917 }
2918
2919 /* Strategy function to convert jiffies to seconds */
2920 int sysctl_jiffies(struct ctl_table *table,
2921                 void __user *oldval, size_t __user *oldlenp,
2922                 void __user *newval, size_t newlen)
2923 {
2924         if (oldval && oldlenp) {
2925                 size_t olen;
2926
2927                 if (get_user(olen, oldlenp))
2928                         return -EFAULT;
2929                 if (olen) {
2930                         int val;
2931
2932                         if (olen < sizeof(int))
2933                                 return -EINVAL;
2934
2935                         val = *(int *)(table->data) / HZ;
2936                         if (put_user(val, (int __user *)oldval))
2937                                 return -EFAULT;
2938                         if (put_user(sizeof(int), oldlenp))
2939                                 return -EFAULT;
2940                 }
2941         }
2942         if (newval && newlen) {
2943                 int new;
2944                 if (newlen != sizeof(int))
2945                         return -EINVAL;
2946                 if (get_user(new, (int __user *)newval))
2947                         return -EFAULT;
2948                 *(int *)(table->data) = new*HZ;
2949         }
2950         return 1;
2951 }
2952
2953 /* Strategy function to convert jiffies to seconds */
2954 int sysctl_ms_jiffies(struct ctl_table *table,
2955                 void __user *oldval, size_t __user *oldlenp,
2956                 void __user *newval, size_t newlen)
2957 {
2958         if (oldval && oldlenp) {
2959                 size_t olen;
2960
2961                 if (get_user(olen, oldlenp))
2962                         return -EFAULT;
2963                 if (olen) {
2964                         int val;
2965
2966                         if (olen < sizeof(int))
2967                                 return -EINVAL;
2968
2969                         val = jiffies_to_msecs(*(int *)(table->data));
2970                         if (put_user(val, (int __user *)oldval))
2971                                 return -EFAULT;
2972                         if (put_user(sizeof(int), oldlenp))
2973                                 return -EFAULT;
2974                 }
2975         }
2976         if (newval && newlen) {
2977                 int new;
2978                 if (newlen != sizeof(int))
2979                         return -EINVAL;
2980                 if (get_user(new, (int __user *)newval))
2981                         return -EFAULT;
2982                 *(int *)(table->data) = msecs_to_jiffies(new);
2983         }
2984         return 1;
2985 }
2986
2987
2988
2989 #else /* CONFIG_SYSCTL_SYSCALL */
2990
2991
2992 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2993 {
2994         struct __sysctl_args tmp;
2995         int error;
2996
2997         if (copy_from_user(&tmp, args, sizeof(tmp)))
2998                 return -EFAULT;
2999
3000         error = deprecated_sysctl_warning(&tmp);
3001
3002         /* If no error reading the parameters then just -ENOSYS ... */
3003         if (!error)
3004                 error = -ENOSYS;
3005
3006         return error;
3007 }
3008
3009 int sysctl_data(struct ctl_table *table,
3010                   void __user *oldval, size_t __user *oldlenp,
3011                   void __user *newval, size_t newlen)
3012 {
3013         return -ENOSYS;
3014 }
3015
3016 int sysctl_string(struct ctl_table *table,
3017                   void __user *oldval, size_t __user *oldlenp,
3018                   void __user *newval, size_t newlen)
3019 {
3020         return -ENOSYS;
3021 }
3022
3023 int sysctl_intvec(struct ctl_table *table,
3024                 void __user *oldval, size_t __user *oldlenp,
3025                 void __user *newval, size_t newlen)
3026 {
3027         return -ENOSYS;
3028 }
3029
3030 int sysctl_jiffies(struct ctl_table *table,
3031                 void __user *oldval, size_t __user *oldlenp,
3032                 void __user *newval, size_t newlen)
3033 {
3034         return -ENOSYS;
3035 }
3036
3037 int sysctl_ms_jiffies(struct ctl_table *table,
3038                 void __user *oldval, size_t __user *oldlenp,
3039                 void __user *newval, size_t newlen)
3040 {
3041         return -ENOSYS;
3042 }
3043
3044 #endif /* CONFIG_SYSCTL_SYSCALL */
3045
3046 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3047 {
3048         static int msg_count;
3049         int name[CTL_MAXNAME];
3050         int i;
3051
3052         /* Check args->nlen. */
3053         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3054                 return -ENOTDIR;
3055
3056         /* Read in the sysctl name for better debug message logging */
3057         for (i = 0; i < args->nlen; i++)
3058                 if (get_user(name[i], args->name + i))
3059                         return -EFAULT;
3060
3061         /* Ignore accesses to kernel.version */
3062         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3063                 return 0;
3064
3065         if (msg_count < 5) {
3066                 msg_count++;
3067                 printk(KERN_INFO
3068                         "warning: process `%s' used the deprecated sysctl "
3069                         "system call with ", current->comm);
3070                 for (i = 0; i < args->nlen; i++)
3071                         printk("%d.", name[i]);
3072                 printk("\n");
3073         }
3074         return 0;
3075 }
3076
3077 /*
3078  * No sense putting this after each symbol definition, twice,
3079  * exception granted :-)
3080  */
3081 EXPORT_SYMBOL(proc_dointvec);
3082 EXPORT_SYMBOL(proc_dointvec_jiffies);
3083 EXPORT_SYMBOL(proc_dointvec_minmax);
3084 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3085 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3086 EXPORT_SYMBOL(proc_dostring);
3087 EXPORT_SYMBOL(proc_doulongvec_minmax);
3088 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3089 EXPORT_SYMBOL(register_sysctl_table);
3090 EXPORT_SYMBOL(register_sysctl_paths);
3091 EXPORT_SYMBOL(sysctl_intvec);
3092 EXPORT_SYMBOL(sysctl_jiffies);
3093 EXPORT_SYMBOL(sysctl_ms_jiffies);
3094 EXPORT_SYMBOL(sysctl_string);
3095 EXPORT_SYMBOL(sysctl_data);
3096 EXPORT_SYMBOL(unregister_sysctl_table);