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   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/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 maps_protect;
  84 extern int latencytop_enabled;
  85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
  86 #ifdef CONFIG_RCU_TORTURE_TEST
  87 extern int rcutorture_runnable;
  88 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
  89
  90 /* Constants used for minimum and  maximum */
  91 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
  92 static int one = 1;
  93 #endif
  94
  95 #ifdef CONFIG_DETECT_SOFTLOCKUP
  96 static int sixty = 60;
  97 static int neg_one = -1;
  98 #endif
  99
 100 #ifdef CONFIG_MMU
 101 static int two = 2;
 102 #endif
 103
 104 static int zero;
 105 static int one_hundred = 100;
 106
 107 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 108 static int maxolduid = 65535;
 109 static int minolduid;
 110 static int min_percpu_pagelist_fract = 8;
 111
 112 static int ngroups_max = NGROUPS_MAX;
 113
 114 #ifdef CONFIG_MODULES
 115 extern char modprobe_path[];
 116 #endif
 117 #ifdef CONFIG_CHR_DEV_SG
 118 extern int sg_big_buff;
 119 #endif
 120
 121 #ifdef __sparc__
 122 extern char reboot_command [];
 123 extern int stop_a_enabled;
 124 extern int scons_pwroff;
 125 #endif
 126
 127 #ifdef __hppa__
 128 extern int pwrsw_enabled;
 129 extern int unaligned_enabled;
 130 #endif
 131
 132 #ifdef CONFIG_S390
 133 #ifdef CONFIG_MATHEMU
 134 extern int sysctl_ieee_emulation_warnings;
 135 #endif
 136 extern int sysctl_userprocess_debug;
 137 extern int spin_retry;
 138 #endif
 139
 140 #ifdef CONFIG_BSD_PROCESS_ACCT
 141 extern int acct_parm[];
 142 #endif
 143
 144 #ifdef CONFIG_IA64
 145 extern int no_unaligned_warning;
 146 #endif
 147
 148 #ifdef CONFIG_RT_MUTEXES
 149 extern int max_lock_depth;
 150 #endif
 151
 152 #ifdef CONFIG_PROC_SYSCTL
 153 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 154                   void __user *buffer, size_t *lenp, loff_t *ppos);
 155 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 156                                void __user *buffer, size_t *lenp, loff_t *ppos);
 157 #endif
 158
 159 static struct ctl_table root_table[];
 160 static struct ctl_table_root sysctl_table_root;
 161 static struct ctl_table_header root_table_header = {
 162         .ctl_table = root_table,
 163         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 164         .root = &sysctl_table_root,
 165 };
 166 static struct ctl_table_root sysctl_table_root = {
 167         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 168         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 169 };
 170
 171 static struct ctl_table kern_table[];
 172 static struct ctl_table vm_table[];
 173 static struct ctl_table fs_table[];
 174 static struct ctl_table debug_table[];
 175 static struct ctl_table dev_table[];
 176 extern struct ctl_table random_table[];
 177 #ifdef CONFIG_INOTIFY_USER
 178 extern struct ctl_table inotify_table[];
 179 #endif
 180
 181 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 182 int sysctl_legacy_va_layout;
 183 #endif
 184
 185 extern int prove_locking;
 186 extern int lock_stat;
 187
 188 /* The default sysctl tables: */
 189
 190 static struct ctl_table root_table[] = {
 191         {
 192                 .ctl_name       = CTL_KERN,
 193                 .procname       = "kernel",
 194                 .mode           = 0555,
 195                 .child          = kern_table,
 196         },
 197         {
 198                 .ctl_name       = CTL_VM,
 199                 .procname       = "vm",
 200                 .mode           = 0555,
 201                 .child          = vm_table,
 202         },
 203         {
 204                 .ctl_name       = CTL_FS,
 205                 .procname       = "fs",
 206                 .mode           = 0555,
 207                 .child          = fs_table,
 208         },
 209         {
 210                 .ctl_name       = CTL_DEBUG,
 211                 .procname       = "debug",
 212                 .mode           = 0555,
 213                 .child          = debug_table,
 214         },
 215         {
 216                 .ctl_name       = CTL_DEV,
 217                 .procname       = "dev",
 218                 .mode           = 0555,
 219                 .child          = dev_table,
 220         },
 221 /*
 222  * NOTE: do not add new entries to this table unless you have read
 223  * Documentation/sysctl/ctl_unnumbered.txt
 224  */
 225         { .ctl_name = 0 }
 226 };
 227
 228 #ifdef CONFIG_SCHED_DEBUG
 229 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 230 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 231 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 232 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 233 #endif
 234
 235 static struct ctl_table kern_table[] = {
 236 #ifdef CONFIG_SCHED_DEBUG
 237         {
 238                 .ctl_name       = CTL_UNNUMBERED,
 239                 .procname       = "sched_min_granularity_ns",
 240                 .data           = &sysctl_sched_min_granularity,
 241                 .maxlen         = sizeof(unsigned int),
 242                 .mode           = 0644,
 243                 .proc_handler   = &sched_nr_latency_handler,
 244                 .strategy       = &sysctl_intvec,
 245                 .extra1         = &min_sched_granularity_ns,
 246                 .extra2         = &max_sched_granularity_ns,
 247         },
 248         {
 249                 .ctl_name       = CTL_UNNUMBERED,
 250                 .procname       = "sched_latency_ns",
 251                 .data           = &sysctl_sched_latency,
 252                 .maxlen         = sizeof(unsigned int),
 253                 .mode           = 0644,
 254                 .proc_handler   = &sched_nr_latency_handler,
 255                 .strategy       = &sysctl_intvec,
 256                 .extra1         = &min_sched_granularity_ns,
 257                 .extra2         = &max_sched_granularity_ns,
 258         },
 259         {
 260                 .ctl_name       = CTL_UNNUMBERED,
 261                 .procname       = "sched_wakeup_granularity_ns",
 262                 .data           = &sysctl_sched_wakeup_granularity,
 263                 .maxlen         = sizeof(unsigned int),
 264                 .mode           = 0644,
 265                 .proc_handler   = &proc_dointvec_minmax,
 266                 .strategy       = &sysctl_intvec,
 267                 .extra1         = &min_wakeup_granularity_ns,
 268                 .extra2         = &max_wakeup_granularity_ns,
 269         },
 270         {
 271                 .ctl_name       = CTL_UNNUMBERED,
 272                 .procname       = "sched_shares_ratelimit",
 273                 .data           = &sysctl_sched_shares_ratelimit,
 274                 .maxlen         = sizeof(unsigned int),
 275                 .mode           = 0644,
 276                 .proc_handler   = &proc_dointvec,
 277         },
 278         {
 279                 .ctl_name       = CTL_UNNUMBERED,
 280                 .procname       = "sched_child_runs_first",
 281                 .data           = &sysctl_sched_child_runs_first,
 282                 .maxlen         = sizeof(unsigned int),
 283                 .mode           = 0644,
 284                 .proc_handler   = &proc_dointvec,
 285         },
 286         {
 287                 .ctl_name       = CTL_UNNUMBERED,
 288                 .procname       = "sched_features",
 289                 .data           = &sysctl_sched_features,
 290                 .maxlen         = sizeof(unsigned int),
 291                 .mode           = 0644,
 292                 .proc_handler   = &proc_dointvec,
 293         },
 294         {
 295                 .ctl_name       = CTL_UNNUMBERED,
 296                 .procname       = "sched_migration_cost",
 297                 .data           = &sysctl_sched_migration_cost,
 298                 .maxlen         = sizeof(unsigned int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec,
 301         },
 302         {
 303                 .ctl_name       = CTL_UNNUMBERED,
 304                 .procname       = "sched_nr_migrate",
 305                 .data           = &sysctl_sched_nr_migrate,
 306                 .maxlen         = sizeof(unsigned int),
 307                 .mode           = 0644,
 308                 .proc_handler   = &proc_dointvec,
 309         },
 310 #endif
 311         {
 312                 .ctl_name       = CTL_UNNUMBERED,
 313                 .procname       = "sched_rt_period_us",
 314                 .data           = &sysctl_sched_rt_period,
 315                 .maxlen         = sizeof(unsigned int),
 316                 .mode           = 0644,
 317                 .proc_handler   = &sched_rt_handler,
 318         },
 319         {
 320                 .ctl_name       = CTL_UNNUMBERED,
 321                 .procname       = "sched_rt_runtime_us",
 322                 .data           = &sysctl_sched_rt_runtime,
 323                 .maxlen         = sizeof(int),
 324                 .mode           = 0644,
 325                 .proc_handler   = &sched_rt_handler,
 326         },
 327         {
 328                 .ctl_name       = CTL_UNNUMBERED,
 329                 .procname       = "sched_compat_yield",
 330                 .data           = &sysctl_sched_compat_yield,
 331                 .maxlen         = sizeof(unsigned int),
 332                 .mode           = 0644,
 333                 .proc_handler   = &proc_dointvec,
 334         },
 335 #ifdef CONFIG_PROVE_LOCKING
 336         {
 337                 .ctl_name       = CTL_UNNUMBERED,
 338                 .procname       = "prove_locking",
 339                 .data           = &prove_locking,
 340                 .maxlen         = sizeof(int),
 341                 .mode           = 0644,
 342                 .proc_handler   = &proc_dointvec,
 343         },
 344 #endif
 345 #ifdef CONFIG_LOCK_STAT
 346         {
 347                 .ctl_name       = CTL_UNNUMBERED,
 348                 .procname       = "lock_stat",
 349                 .data           = &lock_stat,
 350                 .maxlen         = sizeof(int),
 351                 .mode           = 0644,
 352                 .proc_handler   = &proc_dointvec,
 353         },
 354 #endif
 355         {
 356                 .ctl_name       = KERN_PANIC,
 357                 .procname       = "panic",
 358                 .data           = &panic_timeout,
 359                 .maxlen         = sizeof(int),
 360                 .mode           = 0644,
 361                 .proc_handler   = &proc_dointvec,
 362         },
 363         {
 364                 .ctl_name       = KERN_CORE_USES_PID,
 365                 .procname       = "core_uses_pid",
 366                 .data           = &core_uses_pid,
 367                 .maxlen         = sizeof(int),
 368                 .mode           = 0644,
 369                 .proc_handler   = &proc_dointvec,
 370         },
 371         {
 372                 .ctl_name       = KERN_CORE_PATTERN,
 373                 .procname       = "core_pattern",
 374                 .data           = core_pattern,
 375                 .maxlen         = CORENAME_MAX_SIZE,
 376                 .mode           = 0644,
 377                 .proc_handler   = &proc_dostring,
 378                 .strategy       = &sysctl_string,
 379         },
 380 #ifdef CONFIG_PROC_SYSCTL
 381         {
 382                 .procname       = "tainted",
 383                 .data           = &tainted,
 384                 .maxlen         = sizeof(int),
 385                 .mode           = 0644,
 386                 .proc_handler   = &proc_dointvec_taint,
 387         },
 388 #endif
 389 #ifdef CONFIG_LATENCYTOP
 390         {
 391                 .procname       = "latencytop",
 392                 .data           = &latencytop_enabled,
 393                 .maxlen         = sizeof(int),
 394                 .mode           = 0644,
 395                 .proc_handler   = &proc_dointvec,
 396         },
 397 #endif
 398 #ifdef CONFIG_BLK_DEV_INITRD
 399         {
 400                 .ctl_name       = KERN_REALROOTDEV,
 401                 .procname       = "real-root-dev",
 402                 .data           = &real_root_dev,
 403                 .maxlen         = sizeof(int),
 404                 .mode           = 0644,
 405                 .proc_handler   = &proc_dointvec,
 406         },
 407 #endif
 408         {
 409                 .ctl_name       = CTL_UNNUMBERED,
 410                 .procname       = "print-fatal-signals",
 411                 .data           = &print_fatal_signals,
 412                 .maxlen         = sizeof(int),
 413                 .mode           = 0644,
 414                 .proc_handler   = &proc_dointvec,
 415         },
 416 #ifdef __sparc__
 417         {
 418                 .ctl_name       = KERN_SPARC_REBOOT,
 419                 .procname       = "reboot-cmd",
 420                 .data           = reboot_command,
 421                 .maxlen         = 256,
 422                 .mode           = 0644,
 423                 .proc_handler   = &proc_dostring,
 424                 .strategy       = &sysctl_string,
 425         },
 426         {
 427                 .ctl_name       = KERN_SPARC_STOP_A,
 428                 .procname       = "stop-a",
 429                 .data           = &stop_a_enabled,
 430                 .maxlen         = sizeof (int),
 431                 .mode           = 0644,
 432                 .proc_handler   = &proc_dointvec,
 433         },
 434         {
 435                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 436                 .procname       = "scons-poweroff",
 437                 .data           = &scons_pwroff,
 438                 .maxlen         = sizeof (int),
 439                 .mode           = 0644,
 440                 .proc_handler   = &proc_dointvec,
 441         },
 442 #endif
 443 #ifdef __hppa__
 444         {
 445                 .ctl_name       = KERN_HPPA_PWRSW,
 446                 .procname       = "soft-power",
 447                 .data           = &pwrsw_enabled,
 448                 .maxlen         = sizeof (int),
 449                 .mode           = 0644,
 450                 .proc_handler   = &proc_dointvec,
 451         },
 452         {
 453                 .ctl_name       = KERN_HPPA_UNALIGNED,
 454                 .procname       = "unaligned-trap",
 455                 .data           = &unaligned_enabled,
 456                 .maxlen         = sizeof (int),
 457                 .mode           = 0644,
 458                 .proc_handler   = &proc_dointvec,
 459         },
 460 #endif
 461         {
 462                 .ctl_name       = KERN_CTLALTDEL,
 463                 .procname       = "ctrl-alt-del",
 464                 .data           = &C_A_D,
 465                 .maxlen         = sizeof(int),
 466                 .mode           = 0644,
 467                 .proc_handler   = &proc_dointvec,
 468         },
 469 #ifdef CONFIG_FTRACE
 470         {
 471                 .ctl_name       = CTL_UNNUMBERED,
 472                 .procname       = "ftrace_enabled",
 473                 .data           = &ftrace_enabled,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = &ftrace_enable_sysctl,
 477         },
 478 #endif
 479 #ifdef CONFIG_MODULES
 480         {
 481                 .ctl_name       = KERN_MODPROBE,
 482                 .procname       = "modprobe",
 483                 .data           = &modprobe_path,
 484                 .maxlen         = KMOD_PATH_LEN,
 485                 .mode           = 0644,
 486                 .proc_handler   = &proc_dostring,
 487                 .strategy       = &sysctl_string,
 488         },
 489 #endif
 490 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 491         {
 492                 .ctl_name       = KERN_HOTPLUG,
 493                 .procname       = "hotplug",
 494                 .data           = &uevent_helper,
 495                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 496                 .mode           = 0644,
 497                 .proc_handler   = &proc_dostring,
 498                 .strategy       = &sysctl_string,
 499         },
 500 #endif
 501 #ifdef CONFIG_CHR_DEV_SG
 502         {
 503                 .ctl_name       = KERN_SG_BIG_BUFF,
 504                 .procname       = "sg-big-buff",
 505                 .data           = &sg_big_buff,
 506                 .maxlen         = sizeof (int),
 507                 .mode           = 0444,
 508                 .proc_handler   = &proc_dointvec,
 509         },
 510 #endif
 511 #ifdef CONFIG_BSD_PROCESS_ACCT
 512         {
 513                 .ctl_name       = KERN_ACCT,
 514                 .procname       = "acct",
 515                 .data           = &acct_parm,
 516                 .maxlen         = 3*sizeof(int),
 517                 .mode           = 0644,
 518                 .proc_handler   = &proc_dointvec,
 519         },
 520 #endif
 521 #ifdef CONFIG_MAGIC_SYSRQ
 522         {
 523                 .ctl_name       = KERN_SYSRQ,
 524                 .procname       = "sysrq",
 525                 .data           = &__sysrq_enabled,
 526                 .maxlen         = sizeof (int),
 527                 .mode           = 0644,
 528                 .proc_handler   = &proc_dointvec,
 529         },
 530 #endif
 531 #ifdef CONFIG_PROC_SYSCTL
 532         {
 533                 .procname       = "cad_pid",
 534                 .data           = NULL,
 535                 .maxlen         = sizeof (int),
 536                 .mode           = 0600,
 537                 .proc_handler   = &proc_do_cad_pid,
 538         },
 539 #endif
 540         {
 541                 .ctl_name       = KERN_MAX_THREADS,
 542                 .procname       = "threads-max",
 543                 .data           = &max_threads,
 544                 .maxlen         = sizeof(int),
 545                 .mode           = 0644,
 546                 .proc_handler   = &proc_dointvec,
 547         },
 548         {
 549                 .ctl_name       = KERN_RANDOM,
 550                 .procname       = "random",
 551                 .mode           = 0555,
 552                 .child          = random_table,
 553         },
 554         {
 555                 .ctl_name       = KERN_OVERFLOWUID,
 556                 .procname       = "overflowuid",
 557                 .data           = &overflowuid,
 558                 .maxlen         = sizeof(int),
 559                 .mode           = 0644,
 560                 .proc_handler   = &proc_dointvec_minmax,
 561                 .strategy       = &sysctl_intvec,
 562                 .extra1         = &minolduid,
 563                 .extra2         = &maxolduid,
 564         },
 565         {
 566                 .ctl_name       = KERN_OVERFLOWGID,
 567                 .procname       = "overflowgid",
 568                 .data           = &overflowgid,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec_minmax,
 572                 .strategy       = &sysctl_intvec,
 573                 .extra1         = &minolduid,
 574                 .extra2         = &maxolduid,
 575         },
 576 #ifdef CONFIG_S390
 577 #ifdef CONFIG_MATHEMU
 578         {
 579                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 580                 .procname       = "ieee_emulation_warnings",
 581                 .data           = &sysctl_ieee_emulation_warnings,
 582                 .maxlen         = sizeof(int),
 583                 .mode           = 0644,
 584                 .proc_handler   = &proc_dointvec,
 585         },
 586 #endif
 587         {
 588                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 589                 .procname       = "userprocess_debug",
 590                 .data           = &sysctl_userprocess_debug,
 591                 .maxlen         = sizeof(int),
 592                 .mode           = 0644,
 593                 .proc_handler   = &proc_dointvec,
 594         },
 595 #endif
 596         {
 597                 .ctl_name       = KERN_PIDMAX,
 598                 .procname       = "pid_max",
 599                 .data           = &pid_max,
 600                 .maxlen         = sizeof (int),
 601                 .mode           = 0644,
 602                 .proc_handler   = &proc_dointvec_minmax,
 603                 .strategy       = sysctl_intvec,
 604                 .extra1         = &pid_max_min,
 605                 .extra2         = &pid_max_max,
 606         },
 607         {
 608                 .ctl_name       = KERN_PANIC_ON_OOPS,
 609                 .procname       = "panic_on_oops",
 610                 .data           = &panic_on_oops,
 611                 .maxlen         = sizeof(int),
 612                 .mode           = 0644,
 613                 .proc_handler   = &proc_dointvec,
 614         },
 615 #if defined CONFIG_PRINTK
 616         {
 617                 .ctl_name       = KERN_PRINTK,
 618                 .procname       = "printk",
 619                 .data           = &console_loglevel,
 620                 .maxlen         = 4*sizeof(int),
 621                 .mode           = 0644,
 622                 .proc_handler   = &proc_dointvec,
 623         },
 624         {
 625                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 626                 .procname       = "printk_ratelimit",
 627                 .data           = &printk_ratelimit_jiffies,
 628                 .maxlen         = sizeof(int),
 629                 .mode           = 0644,
 630                 .proc_handler   = &proc_dointvec_jiffies,
 631                 .strategy       = &sysctl_jiffies,
 632         },
 633         {
 634                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 635                 .procname       = "printk_ratelimit_burst",
 636                 .data           = &printk_ratelimit_burst,
 637                 .maxlen         = sizeof(int),
 638                 .mode           = 0644,
 639                 .proc_handler   = &proc_dointvec,
 640         },
 641 #endif
 642         {
 643                 .ctl_name       = KERN_NGROUPS_MAX,
 644                 .procname       = "ngroups_max",
 645                 .data           = &ngroups_max,
 646                 .maxlen         = sizeof (int),
 647                 .mode           = 0444,
 648                 .proc_handler   = &proc_dointvec,
 649         },
 650 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 651         {
 652                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 653                 .procname       = "unknown_nmi_panic",
 654                 .data           = &unknown_nmi_panic,
 655                 .maxlen         = sizeof (int),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_dointvec,
 658         },
 659         {
 660                 .procname       = "nmi_watchdog",
 661                 .data           = &nmi_watchdog_enabled,
 662                 .maxlen         = sizeof (int),
 663                 .mode           = 0644,
 664                 .proc_handler   = &proc_nmi_enabled,
 665         },
 666 #endif
 667 #if defined(CONFIG_X86)
 668         {
 669                 .ctl_name       = KERN_PANIC_ON_NMI,
 670                 .procname       = "panic_on_unrecovered_nmi",
 671                 .data           = &panic_on_unrecovered_nmi,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = &proc_dointvec,
 675         },
 676         {
 677                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 678                 .procname       = "bootloader_type",
 679                 .data           = &bootloader_type,
 680                 .maxlen         = sizeof (int),
 681                 .mode           = 0444,
 682                 .proc_handler   = &proc_dointvec,
 683         },
 684         {
 685                 .ctl_name       = CTL_UNNUMBERED,
 686                 .procname       = "kstack_depth_to_print",
 687                 .data           = &kstack_depth_to_print,
 688                 .maxlen         = sizeof(int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_dointvec,
 691         },
 692         {
 693                 .ctl_name       = CTL_UNNUMBERED,
 694                 .procname       = "io_delay_type",
 695                 .data           = &io_delay_type,
 696                 .maxlen         = sizeof(int),
 697                 .mode           = 0644,
 698                 .proc_handler   = &proc_dointvec,
 699         },
 700 #endif
 701 #if defined(CONFIG_MMU)
 702         {
 703                 .ctl_name       = KERN_RANDOMIZE,
 704                 .procname       = "randomize_va_space",
 705                 .data           = &randomize_va_space,
 706                 .maxlen         = sizeof(int),
 707                 .mode           = 0644,
 708                 .proc_handler   = &proc_dointvec,
 709         },
 710 #endif
 711 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 712         {
 713                 .ctl_name       = KERN_SPIN_RETRY,
 714                 .procname       = "spin_retry",
 715                 .data           = &spin_retry,
 716                 .maxlen         = sizeof (int),
 717                 .mode           = 0644,
 718                 .proc_handler   = &proc_dointvec,
 719         },
 720 #endif
 721 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 722         {
 723                 .procname       = "acpi_video_flags",
 724                 .data           = &acpi_realmode_flags,
 725                 .maxlen         = sizeof (unsigned long),
 726                 .mode           = 0644,
 727                 .proc_handler   = &proc_doulongvec_minmax,
 728         },
 729 #endif
 730 #ifdef CONFIG_IA64
 731         {
 732                 .ctl_name       = KERN_IA64_UNALIGNED,
 733                 .procname       = "ignore-unaligned-usertrap",
 734                 .data           = &no_unaligned_warning,
 735                 .maxlen         = sizeof (int),
 736                 .mode           = 0644,
 737                 .proc_handler   = &proc_dointvec,
 738         },
 739 #endif
 740 #ifdef CONFIG_DETECT_SOFTLOCKUP
 741         {
 742                 .ctl_name       = CTL_UNNUMBERED,
 743                 .procname       = "softlockup_panic",
 744                 .data           = &softlockup_panic,
 745                 .maxlen         = sizeof(int),
 746                 .mode           = 0644,
 747                 .proc_handler   = &proc_dointvec_minmax,
 748                 .strategy       = &sysctl_intvec,
 749                 .extra1         = &zero,
 750                 .extra2         = &one,
 751         },
 752         {
 753                 .ctl_name       = CTL_UNNUMBERED,
 754                 .procname       = "softlockup_thresh",
 755                 .data           = &softlockup_thresh,
 756                 .maxlen         = sizeof(int),
 757                 .mode           = 0644,
 758                 .proc_handler   = &proc_dointvec_minmax,
 759                 .strategy       = &sysctl_intvec,
 760                 .extra1         = &neg_one,
 761                 .extra2         = &sixty,
 762         },
 763         {
 764                 .ctl_name       = CTL_UNNUMBERED,
 765                 .procname       = "hung_task_check_count",
 766                 .data           = &sysctl_hung_task_check_count,
 767                 .maxlen         = sizeof(unsigned long),
 768                 .mode           = 0644,
 769                 .proc_handler   = &proc_doulongvec_minmax,
 770                 .strategy       = &sysctl_intvec,
 771         },
 772         {
 773                 .ctl_name       = CTL_UNNUMBERED,
 774                 .procname       = "hung_task_timeout_secs",
 775                 .data           = &sysctl_hung_task_timeout_secs,
 776                 .maxlen         = sizeof(unsigned long),
 777                 .mode           = 0644,
 778                 .proc_handler   = &proc_doulongvec_minmax,
 779                 .strategy       = &sysctl_intvec,
 780         },
 781         {
 782                 .ctl_name       = CTL_UNNUMBERED,
 783                 .procname       = "hung_task_warnings",
 784                 .data           = &sysctl_hung_task_warnings,
 785                 .maxlen         = sizeof(unsigned long),
 786                 .mode           = 0644,
 787                 .proc_handler   = &proc_doulongvec_minmax,
 788                 .strategy       = &sysctl_intvec,
 789         },
 790 #endif
 791 #ifdef CONFIG_COMPAT
 792         {
 793                 .ctl_name       = KERN_COMPAT_LOG,
 794                 .procname       = "compat-log",
 795                 .data           = &compat_log,
 796                 .maxlen         = sizeof (int),
 797                 .mode           = 0644,
 798                 .proc_handler   = &proc_dointvec,
 799         },
 800 #endif
 801 #ifdef CONFIG_RT_MUTEXES
 802         {
 803                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 804                 .procname       = "max_lock_depth",
 805                 .data           = &max_lock_depth,
 806                 .maxlen         = sizeof(int),
 807                 .mode           = 0644,
 808                 .proc_handler   = &proc_dointvec,
 809         },
 810 #endif
 811 #ifdef CONFIG_PROC_FS
 812         {
 813                 .ctl_name       = CTL_UNNUMBERED,
 814                 .procname       = "maps_protect",
 815                 .data           = &maps_protect,
 816                 .maxlen         = sizeof(int),
 817                 .mode           = 0644,
 818                 .proc_handler   = &proc_dointvec,
 819         },
 820 #endif
 821         {
 822                 .ctl_name       = CTL_UNNUMBERED,
 823                 .procname       = "poweroff_cmd",
 824                 .data           = &poweroff_cmd,
 825                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 826                 .mode           = 0644,
 827                 .proc_handler   = &proc_dostring,
 828                 .strategy       = &sysctl_string,
 829         },
 830 #ifdef CONFIG_KEYS
 831         {
 832                 .ctl_name       = CTL_UNNUMBERED,
 833                 .procname       = "keys",
 834                 .mode           = 0555,
 835                 .child          = key_sysctls,
 836         },
 837 #endif
 838 #ifdef CONFIG_RCU_TORTURE_TEST
 839         {
 840                 .ctl_name       = CTL_UNNUMBERED,
 841                 .procname       = "rcutorture_runnable",
 842                 .data           = &rcutorture_runnable,
 843                 .maxlen         = sizeof(int),
 844                 .mode           = 0644,
 845                 .proc_handler   = &proc_dointvec,
 846         },
 847 #endif
 848 /*
 849  * NOTE: do not add new entries to this table unless you have read
 850  * Documentation/sysctl/ctl_unnumbered.txt
 851  */
 852         { .ctl_name = 0 }
 853 };
 854
 855 static struct ctl_table vm_table[] = {
 856         {
 857                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 858                 .procname       = "overcommit_memory",
 859                 .data           = &sysctl_overcommit_memory,
 860                 .maxlen         = sizeof(sysctl_overcommit_memory),
 861                 .mode           = 0644,
 862                 .proc_handler   = &proc_dointvec,
 863         },
 864         {
 865                 .ctl_name       = VM_PANIC_ON_OOM,
 866                 .procname       = "panic_on_oom",
 867                 .data           = &sysctl_panic_on_oom,
 868                 .maxlen         = sizeof(sysctl_panic_on_oom),
 869                 .mode           = 0644,
 870                 .proc_handler   = &proc_dointvec,
 871         },
 872         {
 873                 .ctl_name       = CTL_UNNUMBERED,
 874                 .procname       = "oom_kill_allocating_task",
 875                 .data           = &sysctl_oom_kill_allocating_task,
 876                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 877                 .mode           = 0644,
 878                 .proc_handler   = &proc_dointvec,
 879         },
 880         {
 881                 .ctl_name       = CTL_UNNUMBERED,
 882                 .procname       = "oom_dump_tasks",
 883                 .data           = &sysctl_oom_dump_tasks,
 884                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
 885                 .mode           = 0644,
 886                 .proc_handler   = &proc_dointvec,
 887         },
 888         {
 889                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 890                 .procname       = "overcommit_ratio",
 891                 .data           = &sysctl_overcommit_ratio,
 892                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 893                 .mode           = 0644,
 894                 .proc_handler   = &proc_dointvec,
 895         },
 896         {
 897                 .ctl_name       = VM_PAGE_CLUSTER,
 898                 .procname       = "page-cluster",
 899                 .data           = &page_cluster,
 900                 .maxlen         = sizeof(int),
 901                 .mode           = 0644,
 902                 .proc_handler   = &proc_dointvec,
 903         },
 904         {
 905                 .ctl_name       = VM_DIRTY_BACKGROUND,
 906                 .procname       = "dirty_background_ratio",
 907                 .data           = &dirty_background_ratio,
 908                 .maxlen         = sizeof(dirty_background_ratio),
 909                 .mode           = 0644,
 910                 .proc_handler   = &proc_dointvec_minmax,
 911                 .strategy       = &sysctl_intvec,
 912                 .extra1         = &zero,
 913                 .extra2         = &one_hundred,
 914         },
 915         {
 916                 .ctl_name       = VM_DIRTY_RATIO,
 917                 .procname       = "dirty_ratio",
 918                 .data           = &vm_dirty_ratio,
 919                 .maxlen         = sizeof(vm_dirty_ratio),
 920                 .mode           = 0644,
 921                 .proc_handler   = &dirty_ratio_handler,
 922                 .strategy       = &sysctl_intvec,
 923                 .extra1         = &zero,
 924                 .extra2         = &one_hundred,
 925         },
 926         {
 927                 .procname       = "dirty_writeback_centisecs",
 928                 .data           = &dirty_writeback_interval,
 929                 .maxlen         = sizeof(dirty_writeback_interval),
 930                 .mode           = 0644,
 931                 .proc_handler   = &dirty_writeback_centisecs_handler,
 932         },
 933         {
 934                 .procname       = "dirty_expire_centisecs",
 935                 .data           = &dirty_expire_interval,
 936                 .maxlen         = sizeof(dirty_expire_interval),
 937                 .mode           = 0644,
 938                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 939         },
 940         {
 941                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 942                 .procname       = "nr_pdflush_threads",
 943                 .data           = &nr_pdflush_threads,
 944                 .maxlen         = sizeof nr_pdflush_threads,
 945                 .mode           = 0444 /* read-only*/,
 946                 .proc_handler   = &proc_dointvec,
 947         },
 948         {
 949                 .ctl_name       = VM_SWAPPINESS,
 950                 .procname       = "swappiness",
 951                 .data           = &vm_swappiness,
 952                 .maxlen         = sizeof(vm_swappiness),
 953                 .mode           = 0644,
 954                 .proc_handler   = &proc_dointvec_minmax,
 955                 .strategy       = &sysctl_intvec,
 956                 .extra1         = &zero,
 957                 .extra2         = &one_hundred,
 958         },
 959 #ifdef CONFIG_HUGETLB_PAGE
 960          {
 961                 .procname       = "nr_hugepages",
 962                 .data           = &max_huge_pages,
 963                 .maxlen         = sizeof(unsigned long),
 964                 .mode           = 0644,
 965                 .proc_handler   = &hugetlb_sysctl_handler,
 966                 .extra1         = (void *)&hugetlb_zero,
 967                 .extra2         = (void *)&hugetlb_infinity,
 968          },
 969          {
 970                 .ctl_name       = VM_HUGETLB_GROUP,
 971                 .procname       = "hugetlb_shm_group",
 972                 .data           = &sysctl_hugetlb_shm_group,
 973                 .maxlen         = sizeof(gid_t),
 974                 .mode           = 0644,
 975                 .proc_handler   = &proc_dointvec,
 976          },
 977          {
 978                 .ctl_name       = CTL_UNNUMBERED,
 979                 .procname       = "hugepages_treat_as_movable",
 980                 .data           = &hugepages_treat_as_movable,
 981                 .maxlen         = sizeof(int),
 982                 .mode           = 0644,
 983                 .proc_handler   = &hugetlb_treat_movable_handler,
 984         },
 985         {
 986                 .ctl_name       = CTL_UNNUMBERED,
 987                 .procname       = "nr_overcommit_hugepages",
 988                 .data           = &sysctl_overcommit_huge_pages,
 989                 .maxlen         = sizeof(sysctl_overcommit_huge_pages),
 990                 .mode           = 0644,
 991                 .proc_handler   = &hugetlb_overcommit_handler,
 992         },
 993 #endif
 994         {
 995                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 996                 .procname       = "lowmem_reserve_ratio",
 997                 .data           = &sysctl_lowmem_reserve_ratio,
 998                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 999                 .mode           = 0644,
1000                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1001                 .strategy       = &sysctl_intvec,
1002         },
1003         {
1004                 .ctl_name       = VM_DROP_PAGECACHE,
1005                 .procname       = "drop_caches",
1006                 .data           = &sysctl_drop_caches,
1007                 .maxlen         = sizeof(int),
1008                 .mode           = 0644,
1009                 .proc_handler   = drop_caches_sysctl_handler,
1010                 .strategy       = &sysctl_intvec,
1011         },
1012         {
1013                 .ctl_name       = VM_MIN_FREE_KBYTES,
1014                 .procname       = "min_free_kbytes",
1015                 .data           = &min_free_kbytes,
1016                 .maxlen         = sizeof(min_free_kbytes),
1017                 .mode           = 0644,
1018                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1019                 .strategy       = &sysctl_intvec,
1020                 .extra1         = &zero,
1021         },
1022         {
1023                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1024                 .procname       = "percpu_pagelist_fraction",
1025                 .data           = &percpu_pagelist_fraction,
1026                 .maxlen         = sizeof(percpu_pagelist_fraction),
1027                 .mode           = 0644,
1028                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1029                 .strategy       = &sysctl_intvec,
1030                 .extra1         = &min_percpu_pagelist_fract,
1031         },
1032 #ifdef CONFIG_MMU
1033         {
1034                 .ctl_name       = VM_MAX_MAP_COUNT,
1035                 .procname       = "max_map_count",
1036                 .data           = &sysctl_max_map_count,
1037                 .maxlen         = sizeof(sysctl_max_map_count),
1038                 .mode           = 0644,
1039                 .proc_handler   = &proc_dointvec
1040         },
1041 #endif
1042         {
1043                 .ctl_name       = VM_LAPTOP_MODE,
1044                 .procname       = "laptop_mode",
1045                 .data           = &laptop_mode,
1046                 .maxlen         = sizeof(laptop_mode),
1047                 .mode           = 0644,
1048                 .proc_handler   = &proc_dointvec_jiffies,
1049                 .strategy       = &sysctl_jiffies,
1050         },
1051         {
1052                 .ctl_name       = VM_BLOCK_DUMP,
1053                 .procname       = "block_dump",
1054                 .data           = &block_dump,
1055                 .maxlen         = sizeof(block_dump),
1056                 .mode           = 0644,
1057                 .proc_handler   = &proc_dointvec,
1058                 .strategy       = &sysctl_intvec,
1059                 .extra1         = &zero,
1060         },
1061         {
1062                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1063                 .procname       = "vfs_cache_pressure",
1064                 .data           = &sysctl_vfs_cache_pressure,
1065                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1066                 .mode           = 0644,
1067                 .proc_handler   = &proc_dointvec,
1068                 .strategy       = &sysctl_intvec,
1069                 .extra1         = &zero,
1070         },
1071 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1072         {
1073                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1074                 .procname       = "legacy_va_layout",
1075                 .data           = &sysctl_legacy_va_layout,
1076                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1077                 .mode           = 0644,
1078                 .proc_handler   = &proc_dointvec,
1079                 .strategy       = &sysctl_intvec,
1080                 .extra1         = &zero,
1081         },
1082 #endif
1083 #ifdef CONFIG_NUMA
1084         {
1085                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1086                 .procname       = "zone_reclaim_mode",
1087                 .data           = &zone_reclaim_mode,
1088                 .maxlen         = sizeof(zone_reclaim_mode),
1089                 .mode           = 0644,
1090                 .proc_handler   = &proc_dointvec,
1091                 .strategy       = &sysctl_intvec,
1092                 .extra1         = &zero,
1093         },
1094         {
1095                 .ctl_name       = VM_MIN_UNMAPPED,
1096                 .procname       = "min_unmapped_ratio",
1097                 .data           = &sysctl_min_unmapped_ratio,
1098                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1099                 .mode           = 0644,
1100                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1101                 .strategy       = &sysctl_intvec,
1102                 .extra1         = &zero,
1103                 .extra2         = &one_hundred,
1104         },
1105         {
1106                 .ctl_name       = VM_MIN_SLAB,
1107                 .procname       = "min_slab_ratio",
1108                 .data           = &sysctl_min_slab_ratio,
1109                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1110                 .mode           = 0644,
1111                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1112                 .strategy       = &sysctl_intvec,
1113                 .extra1         = &zero,
1114                 .extra2         = &one_hundred,
1115         },
1116 #endif
1117 #ifdef CONFIG_SMP
1118         {
1119                 .ctl_name       = CTL_UNNUMBERED,
1120                 .procname       = "stat_interval",
1121                 .data           = &sysctl_stat_interval,
1122                 .maxlen         = sizeof(sysctl_stat_interval),
1123                 .mode           = 0644,
1124                 .proc_handler   = &proc_dointvec_jiffies,
1125                 .strategy       = &sysctl_jiffies,
1126         },
1127 #endif
1128 #ifdef CONFIG_SECURITY
1129         {
1130                 .ctl_name       = CTL_UNNUMBERED,
1131                 .procname       = "mmap_min_addr",
1132                 .data           = &mmap_min_addr,
1133                 .maxlen         = sizeof(unsigned long),
1134                 .mode           = 0644,
1135                 .proc_handler   = &proc_doulongvec_minmax,
1136         },
1137 #endif
1138 #ifdef CONFIG_NUMA
1139         {
1140                 .ctl_name       = CTL_UNNUMBERED,
1141                 .procname       = "numa_zonelist_order",
1142                 .data           = &numa_zonelist_order,
1143                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1144                 .mode           = 0644,
1145                 .proc_handler   = &numa_zonelist_order_handler,
1146                 .strategy       = &sysctl_string,
1147         },
1148 #endif
1149 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1150    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1151         {
1152                 .ctl_name       = VM_VDSO_ENABLED,
1153                 .procname       = "vdso_enabled",
1154                 .data           = &vdso_enabled,
1155                 .maxlen         = sizeof(vdso_enabled),
1156                 .mode           = 0644,
1157                 .proc_handler   = &proc_dointvec,
1158                 .strategy       = &sysctl_intvec,
1159                 .extra1         = &zero,
1160         },
1161 #endif
1162 #ifdef CONFIG_HIGHMEM
1163         {
1164                 .ctl_name       = CTL_UNNUMBERED,
1165                 .procname       = "highmem_is_dirtyable",
1166                 .data           = &vm_highmem_is_dirtyable,
1167                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1168                 .mode           = 0644,
1169                 .proc_handler   = &proc_dointvec_minmax,
1170                 .strategy       = &sysctl_intvec,
1171                 .extra1         = &zero,
1172                 .extra2         = &one,
1173         },
1174 #endif
1175 /*
1176  * NOTE: do not add new entries to this table unless you have read
1177  * Documentation/sysctl/ctl_unnumbered.txt
1178  */
1179         { .ctl_name = 0 }
1180 };
1181
1182 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1183 static struct ctl_table binfmt_misc_table[] = {
1184         { .ctl_name = 0 }
1185 };
1186 #endif
1187
1188 static struct ctl_table fs_table[] = {
1189         {
1190                 .ctl_name       = FS_NRINODE,
1191                 .procname       = "inode-nr",
1192                 .data           = &inodes_stat,
1193                 .maxlen         = 2*sizeof(int),
1194                 .mode           = 0444,
1195                 .proc_handler   = &proc_dointvec,
1196         },
1197         {
1198                 .ctl_name       = FS_STATINODE,
1199                 .procname       = "inode-state",
1200                 .data           = &inodes_stat,
1201                 .maxlen         = 7*sizeof(int),
1202                 .mode           = 0444,
1203                 .proc_handler   = &proc_dointvec,
1204         },
1205         {
1206                 .procname       = "file-nr",
1207                 .data           = &files_stat,
1208                 .maxlen         = 3*sizeof(int),
1209                 .mode           = 0444,
1210                 .proc_handler   = &proc_nr_files,
1211         },
1212         {
1213                 .ctl_name       = FS_MAXFILE,
1214                 .procname       = "file-max",
1215                 .data           = &files_stat.max_files,
1216                 .maxlen         = sizeof(int),
1217                 .mode           = 0644,
1218                 .proc_handler   = &proc_dointvec,
1219         },
1220         {
1221                 .ctl_name       = CTL_UNNUMBERED,
1222                 .procname       = "nr_open",
1223                 .data           = &sysctl_nr_open,
1224                 .maxlen         = sizeof(int),
1225                 .mode           = 0644,
1226                 .proc_handler   = &proc_dointvec_minmax,
1227                 .extra1         = &sysctl_nr_open_min,
1228                 .extra2         = &sysctl_nr_open_max,
1229         },
1230         {
1231                 .ctl_name       = FS_DENTRY,
1232                 .procname       = "dentry-state",
1233                 .data           = &dentry_stat,
1234                 .maxlen         = 6*sizeof(int),
1235                 .mode           = 0444,
1236                 .proc_handler   = &proc_dointvec,
1237         },
1238         {
1239                 .ctl_name       = FS_OVERFLOWUID,
1240                 .procname       = "overflowuid",
1241                 .data           = &fs_overflowuid,
1242                 .maxlen         = sizeof(int),
1243                 .mode           = 0644,
1244                 .proc_handler   = &proc_dointvec_minmax,
1245                 .strategy       = &sysctl_intvec,
1246                 .extra1         = &minolduid,
1247                 .extra2         = &maxolduid,
1248         },
1249         {
1250                 .ctl_name       = FS_OVERFLOWGID,
1251                 .procname       = "overflowgid",
1252                 .data           = &fs_overflowgid,
1253                 .maxlen         = sizeof(int),
1254                 .mode           = 0644,
1255                 .proc_handler   = &proc_dointvec_minmax,
1256                 .strategy       = &sysctl_intvec,
1257                 .extra1         = &minolduid,
1258                 .extra2         = &maxolduid,
1259         },
1260         {
1261                 .ctl_name       = FS_LEASES,
1262                 .procname       = "leases-enable",
1263                 .data           = &leases_enable,
1264                 .maxlen         = sizeof(int),
1265                 .mode           = 0644,
1266                 .proc_handler   = &proc_dointvec,
1267         },
1268 #ifdef CONFIG_DNOTIFY
1269         {
1270                 .ctl_name       = FS_DIR_NOTIFY,
1271                 .procname       = "dir-notify-enable",
1272                 .data           = &dir_notify_enable,
1273                 .maxlen         = sizeof(int),
1274                 .mode           = 0644,
1275                 .proc_handler   = &proc_dointvec,
1276         },
1277 #endif
1278 #ifdef CONFIG_MMU
1279         {
1280                 .ctl_name       = FS_LEASE_TIME,
1281                 .procname       = "lease-break-time",
1282                 .data           = &lease_break_time,
1283                 .maxlen         = sizeof(int),
1284                 .mode           = 0644,
1285                 .proc_handler   = &proc_dointvec_minmax,
1286                 .strategy       = &sysctl_intvec,
1287                 .extra1         = &zero,
1288                 .extra2         = &two,
1289         },
1290         {
1291                 .procname       = "aio-nr",
1292                 .data           = &aio_nr,
1293                 .maxlen         = sizeof(aio_nr),
1294                 .mode           = 0444,
1295                 .proc_handler   = &proc_doulongvec_minmax,
1296         },
1297         {
1298                 .procname       = "aio-max-nr",
1299                 .data           = &aio_max_nr,
1300                 .maxlen         = sizeof(aio_max_nr),
1301                 .mode           = 0644,
1302                 .proc_handler   = &proc_doulongvec_minmax,
1303         },
1304 #ifdef CONFIG_INOTIFY_USER
1305         {
1306                 .ctl_name       = FS_INOTIFY,
1307                 .procname       = "inotify",
1308                 .mode           = 0555,
1309                 .child          = inotify_table,
1310         },
1311 #endif
1312 #endif
1313         {
1314                 .ctl_name       = KERN_SETUID_DUMPABLE,
1315                 .procname       = "suid_dumpable",
1316                 .data           = &suid_dumpable,
1317                 .maxlen         = sizeof(int),
1318                 .mode           = 0644,
1319                 .proc_handler   = &proc_dointvec,
1320         },
1321 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1322         {
1323                 .ctl_name       = CTL_UNNUMBERED,
1324                 .procname       = "binfmt_misc",
1325                 .mode           = 0555,
1326                 .child          = binfmt_misc_table,
1327         },
1328 #endif
1329 /*
1330  * NOTE: do not add new entries to this table unless you have read
1331  * Documentation/sysctl/ctl_unnumbered.txt
1332  */
1333         { .ctl_name = 0 }
1334 };
1335
1336 static struct ctl_table debug_table[] = {
1337 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1338         {
1339                 .ctl_name       = CTL_UNNUMBERED,
1340                 .procname       = "exception-trace",
1341                 .data           = &show_unhandled_signals,
1342                 .maxlen         = sizeof(int),
1343                 .mode           = 0644,
1344                 .proc_handler   = proc_dointvec
1345         },
1346 #endif
1347         { .ctl_name = 0 }
1348 };
1349
1350 static struct ctl_table dev_table[] = {
1351         { .ctl_name = 0 }
1352 };
1353
1354 static DEFINE_SPINLOCK(sysctl_lock);
1355
1356 /* called under sysctl_lock */
1357 static int use_table(struct ctl_table_header *p)
1358 {
1359         if (unlikely(p->unregistering))
1360                 return 0;
1361         p->used++;
1362         return 1;
1363 }
1364
1365 /* called under sysctl_lock */
1366 static void unuse_table(struct ctl_table_header *p)
1367 {
1368         if (!--p->used)
1369                 if (unlikely(p->unregistering))
1370                         complete(p->unregistering);
1371 }
1372
1373 /* called under sysctl_lock, will reacquire if has to wait */
1374 static void start_unregistering(struct ctl_table_header *p)
1375 {
1376         /*
1377          * if p->used is 0, nobody will ever touch that entry again;
1378          * we'll eliminate all paths to it before dropping sysctl_lock
1379          */
1380         if (unlikely(p->used)) {
1381                 struct completion wait;
1382                 init_completion(&wait);
1383                 p->unregistering = &wait;
1384                 spin_unlock(&sysctl_lock);
1385                 wait_for_completion(&wait);
1386                 spin_lock(&sysctl_lock);
1387         }
1388         /*
1389          * do not remove from the list until nobody holds it; walking the
1390          * list in do_sysctl() relies on that.
1391          */
1392         list_del_init(&p->ctl_entry);
1393 }
1394
1395 void sysctl_head_finish(struct ctl_table_header *head)
1396 {
1397         if (!head)
1398                 return;
1399         spin_lock(&sysctl_lock);
1400         unuse_table(head);
1401         spin_unlock(&sysctl_lock);
1402 }
1403
1404 static struct list_head *
1405 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1406 {
1407         struct list_head *header_list;
1408         header_list = &root->header_list;
1409         if (root->lookup)
1410                 header_list = root->lookup(root, namespaces);
1411         return header_list;
1412 }
1413
1414 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1415                                             struct ctl_table_header *prev)
1416 {
1417         struct ctl_table_root *root;
1418         struct list_head *header_list;
1419         struct ctl_table_header *head;
1420         struct list_head *tmp;
1421
1422         spin_lock(&sysctl_lock);
1423         if (prev) {
1424                 head = prev;
1425                 tmp = &prev->ctl_entry;
1426                 unuse_table(prev);
1427                 goto next;
1428         }
1429         tmp = &root_table_header.ctl_entry;
1430         for (;;) {
1431                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1432
1433                 if (!use_table(head))
1434                         goto next;
1435                 spin_unlock(&sysctl_lock);
1436                 return head;
1437         next:
1438                 root = head->root;
1439                 tmp = tmp->next;
1440                 header_list = lookup_header_list(root, namespaces);
1441                 if (tmp != header_list)
1442                         continue;
1443
1444                 do {
1445                         root = list_entry(root->root_list.next,
1446                                         struct ctl_table_root, root_list);
1447                         if (root == &sysctl_table_root)
1448                                 goto out;
1449                         header_list = lookup_header_list(root, namespaces);
1450                 } while (list_empty(header_list));
1451                 tmp = header_list->next;
1452         }
1453 out:
1454         spin_unlock(&sysctl_lock);
1455         return NULL;
1456 }
1457
1458 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1459 {
1460         return __sysctl_head_next(current->nsproxy, prev);
1461 }
1462
1463 void register_sysctl_root(struct ctl_table_root *root)
1464 {
1465         spin_lock(&sysctl_lock);
1466         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1467         spin_unlock(&sysctl_lock);
1468 }
1469
1470 #ifdef CONFIG_SYSCTL_SYSCALL
1471 /* Perform the actual read/write of a sysctl table entry. */
1472 static int do_sysctl_strategy(struct ctl_table_root *root,
1473                         struct ctl_table *table,
1474                         int __user *name, int nlen,
1475                         void __user *oldval, size_t __user *oldlenp,
1476                         void __user *newval, size_t newlen)
1477 {
1478         int op = 0, rc;
1479
1480         if (oldval)
1481                 op |= 004;
1482         if (newval)
1483                 op |= 002;
1484         if (sysctl_perm(root, table, op))
1485                 return -EPERM;
1486
1487         if (table->strategy) {
1488                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1489                                      newval, newlen);
1490                 if (rc < 0)
1491                         return rc;
1492                 if (rc > 0)
1493                         return 0;
1494         }
1495
1496         /* If there is no strategy routine, or if the strategy returns
1497          * zero, proceed with automatic r/w */
1498         if (table->data && table->maxlen) {
1499                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1500                                  newval, newlen);
1501                 if (rc < 0)
1502                         return rc;
1503         }
1504         return 0;
1505 }
1506
1507 static int parse_table(int __user *name, int nlen,
1508                        void __user *oldval, size_t __user *oldlenp,
1509                        void __user *newval, size_t newlen,
1510                        struct ctl_table_root *root,
1511                        struct ctl_table *table)
1512 {
1513         int n;
1514 repeat:
1515         if (!nlen)
1516                 return -ENOTDIR;
1517         if (get_user(n, name))
1518                 return -EFAULT;
1519         for ( ; table->ctl_name || table->procname; table++) {
1520                 if (!table->ctl_name)
1521                         continue;
1522                 if (n == table->ctl_name) {
1523                         int error;
1524                         if (table->child) {
1525                                 if (sysctl_perm(root, table, 001))
1526                                         return -EPERM;
1527                                 name++;
1528                                 nlen--;
1529                                 table = table->child;
1530                                 goto repeat;
1531                         }
1532                         error = do_sysctl_strategy(root, table, name, nlen,
1533                                                    oldval, oldlenp,
1534                                                    newval, newlen);
1535                         return error;
1536                 }
1537         }
1538         return -ENOTDIR;
1539 }
1540
1541 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1542                void __user *newval, size_t newlen)
1543 {
1544         struct ctl_table_header *head;
1545         int error = -ENOTDIR;
1546
1547         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1548                 return -ENOTDIR;
1549         if (oldval) {
1550                 int old_len;
1551                 if (!oldlenp || get_user(old_len, oldlenp))
1552                         return -EFAULT;
1553         }
1554
1555         for (head = sysctl_head_next(NULL); head;
1556                         head = sysctl_head_next(head)) {
1557                 error = parse_table(name, nlen, oldval, oldlenp,
1558                                         newval, newlen,
1559                                         head->root, head->ctl_table);
1560                 if (error != -ENOTDIR) {
1561                         sysctl_head_finish(head);
1562                         break;
1563                 }
1564         }
1565         return error;
1566 }
1567
1568 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1569 {
1570         struct __sysctl_args tmp;
1571         int error;
1572
1573         if (copy_from_user(&tmp, args, sizeof(tmp)))
1574                 return -EFAULT;
1575
1576         error = deprecated_sysctl_warning(&tmp);
1577         if (error)
1578                 goto out;
1579
1580         lock_kernel();
1581         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1582                           tmp.newval, tmp.newlen);
1583         unlock_kernel();
1584 out:
1585         return error;
1586 }
1587 #endif /* CONFIG_SYSCTL_SYSCALL */
1588
1589 /*
1590  * sysctl_perm does NOT grant the superuser all rights automatically, because
1591  * some sysctl variables are readonly even to root.
1592  */
1593
1594 static int test_perm(int mode, int op)
1595 {
1596         if (!current->euid)
1597                 mode >>= 6;
1598         else if (in_egroup_p(0))
1599                 mode >>= 3;
1600         if ((mode & op & 0007) == op)
1601                 return 0;
1602         return -EACCES;
1603 }
1604
1605 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1606 {
1607         int error;
1608         int mode;
1609
1610         error = security_sysctl(table, op);
1611         if (error)
1612                 return error;
1613
1614         if (root->permissions)
1615                 mode = root->permissions(root, current->nsproxy, table);
1616         else
1617                 mode = table->mode;
1618
1619         return test_perm(mode, op);
1620 }
1621
1622 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1623 {
1624         for (; table->ctl_name || table->procname; table++) {
1625                 table->parent = parent;
1626                 if (table->child)
1627                         sysctl_set_parent(table, table->child);
1628         }
1629 }
1630
1631 static __init int sysctl_init(void)
1632 {
1633         sysctl_set_parent(NULL, root_table);
1634 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1635         {
1636                 int err;
1637                 err = sysctl_check_table(current->nsproxy, root_table);
1638         }
1639 #endif
1640         return 0;
1641 }
1642
1643 core_initcall(sysctl_init);
1644
1645 /**
1646  * __register_sysctl_paths - register a sysctl hierarchy
1647  * @root: List of sysctl headers to register on
1648  * @namespaces: Data to compute which lists of sysctl entries are visible
1649  * @path: The path to the directory the sysctl table is in.
1650  * @table: the top-level table structure
1651  *
1652  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1653  * array. A completely 0 filled entry terminates the table.
1654  *
1655  * The members of the &struct ctl_table structure are used as follows:
1656  *
1657  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1658  *            must be unique within that level of sysctl
1659  *
1660  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1661  *            enter a sysctl file
1662  *
1663  * data - a pointer to data for use by proc_handler
1664  *
1665  * maxlen - the maximum size in bytes of the data
1666  *
1667  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1668  *
1669  * child - a pointer to the child sysctl table if this entry is a directory, or
1670  *         %NULL.
1671  *
1672  * proc_handler - the text handler routine (described below)
1673  *
1674  * strategy - the strategy routine (described below)
1675  *
1676  * de - for internal use by the sysctl routines
1677  *
1678  * extra1, extra2 - extra pointers usable by the proc handler routines
1679  *
1680  * Leaf nodes in the sysctl tree will be represented by a single file
1681  * under /proc; non-leaf nodes will be represented by directories.
1682  *
1683  * sysctl(2) can automatically manage read and write requests through
1684  * the sysctl table.  The data and maxlen fields of the ctl_table
1685  * struct enable minimal validation of the values being written to be
1686  * performed, and the mode field allows minimal authentication.
1687  *
1688  * More sophisticated management can be enabled by the provision of a
1689  * strategy routine with the table entry.  This will be called before
1690  * any automatic read or write of the data is performed.
1691  *
1692  * The strategy routine may return
1693  *
1694  * < 0 - Error occurred (error is passed to user process)
1695  *
1696  * 0   - OK - proceed with automatic read or write.
1697  *
1698  * > 0 - OK - read or write has been done by the strategy routine, so
1699  *       return immediately.
1700  *
1701  * There must be a proc_handler routine for any terminal nodes
1702  * mirrored under /proc/sys (non-terminals are handled by a built-in
1703  * directory handler).  Several default handlers are available to
1704  * cover common cases -
1705  *
1706  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1707  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1708  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1709  *
1710  * It is the handler's job to read the input buffer from user memory
1711  * and process it. The handler should return 0 on success.
1712  *
1713  * This routine returns %NULL on a failure to register, and a pointer
1714  * to the table header on success.
1715  */
1716 struct ctl_table_header *__register_sysctl_paths(
1717         struct ctl_table_root *root,
1718         struct nsproxy *namespaces,
1719         const struct ctl_path *path, struct ctl_table *table)
1720 {
1721         struct list_head *header_list;
1722         struct ctl_table_header *header;
1723         struct ctl_table *new, **prevp;
1724         unsigned int n, npath;
1725
1726         /* Count the path components */
1727         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1728                 ;
1729
1730         /*
1731          * For each path component, allocate a 2-element ctl_table array.
1732          * The first array element will be filled with the sysctl entry
1733          * for this, the second will be the sentinel (ctl_name == 0).
1734          *
1735          * We allocate everything in one go so that we don't have to
1736          * worry about freeing additional memory in unregister_sysctl_table.
1737          */
1738         header = kzalloc(sizeof(struct ctl_table_header) +
1739                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1740         if (!header)
1741                 return NULL;
1742
1743         new = (struct ctl_table *) (header + 1);
1744
1745         /* Now connect the dots */
1746         prevp = &header->ctl_table;
1747         for (n = 0; n < npath; ++n, ++path) {
1748                 /* Copy the procname */
1749                 new->procname = path->procname;
1750                 new->ctl_name = path->ctl_name;
1751                 new->mode     = 0555;
1752
1753                 *prevp = new;
1754                 prevp = &new->child;
1755
1756                 new += 2;
1757         }
1758         *prevp = table;
1759         header->ctl_table_arg = table;
1760
1761         INIT_LIST_HEAD(&header->ctl_entry);
1762         header->used = 0;
1763         header->unregistering = NULL;
1764         header->root = root;
1765         sysctl_set_parent(NULL, header->ctl_table);
1766 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1767         if (sysctl_check_table(namespaces, header->ctl_table)) {
1768                 kfree(header);
1769                 return NULL;
1770         }
1771 #endif
1772         spin_lock(&sysctl_lock);
1773         header_list = lookup_header_list(root, namespaces);
1774         list_add_tail(&header->ctl_entry, header_list);
1775         spin_unlock(&sysctl_lock);
1776
1777         return header;
1778 }
1779
1780 /**
1781  * register_sysctl_table_path - register a sysctl table hierarchy
1782  * @path: The path to the directory the sysctl table is in.
1783  * @table: the top-level table structure
1784  *
1785  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1786  * array. A completely 0 filled entry terminates the table.
1787  *
1788  * See __register_sysctl_paths for more details.
1789  */
1790 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1791                                                 struct ctl_table *table)
1792 {
1793         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1794                                         path, table);
1795 }
1796
1797 /**
1798  * register_sysctl_table - register a sysctl table hierarchy
1799  * @table: the top-level table structure
1800  *
1801  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1802  * array. A completely 0 filled entry terminates the table.
1803  *
1804  * See register_sysctl_paths for more details.
1805  */
1806 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1807 {
1808         static const struct ctl_path null_path[] = { {} };
1809
1810         return register_sysctl_paths(null_path, table);
1811 }
1812
1813 /**
1814  * unregister_sysctl_table - unregister a sysctl table hierarchy
1815  * @header: the header returned from register_sysctl_table
1816  *
1817  * Unregisters the sysctl table and all children. proc entries may not
1818  * actually be removed until they are no longer used by anyone.
1819  */
1820 void unregister_sysctl_table(struct ctl_table_header * header)
1821 {
1822         might_sleep();
1823
1824         if (header == NULL)
1825                 return;
1826
1827         spin_lock(&sysctl_lock);
1828         start_unregistering(header);
1829         spin_unlock(&sysctl_lock);
1830         kfree(header);
1831 }
1832
1833 #else /* !CONFIG_SYSCTL */
1834 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1835 {
1836         return NULL;
1837 }
1838
1839 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1840                                                     struct ctl_table *table)
1841 {
1842         return NULL;
1843 }
1844
1845 void unregister_sysctl_table(struct ctl_table_header * table)
1846 {
1847 }
1848
1849 #endif /* CONFIG_SYSCTL */
1850
1851 /*
1852  * /proc/sys support
1853  */
1854
1855 #ifdef CONFIG_PROC_SYSCTL
1856
1857 static int _proc_do_string(void* data, int maxlen, int write,
1858                            struct file *filp, void __user *buffer,
1859                            size_t *lenp, loff_t *ppos)
1860 {
1861         size_t len;
1862         char __user *p;
1863         char c;
1864
1865         if (!data || !maxlen || !*lenp) {
1866                 *lenp = 0;
1867                 return 0;
1868         }
1869
1870         if (write) {
1871                 len = 0;
1872                 p = buffer;
1873                 while (len < *lenp) {
1874                         if (get_user(c, p++))
1875                                 return -EFAULT;
1876                         if (c == 0 || c == '\n')
1877                                 break;
1878                         len++;
1879                 }
1880                 if (len >= maxlen)
1881                         len = maxlen-1;
1882                 if(copy_from_user(data, buffer, len))
1883                         return -EFAULT;
1884                 ((char *) data)[len] = 0;
1885                 *ppos += *lenp;
1886         } else {
1887                 len = strlen(data);
1888                 if (len > maxlen)
1889                         len = maxlen;
1890
1891                 if (*ppos > len) {
1892                         *lenp = 0;
1893                         return 0;
1894                 }
1895
1896                 data += *ppos;
1897                 len  -= *ppos;
1898
1899                 if (len > *lenp)
1900                         len = *lenp;
1901                 if (len)
1902                         if(copy_to_user(buffer, data, len))
1903                                 return -EFAULT;
1904                 if (len < *lenp) {
1905                         if(put_user('\n', ((char __user *) buffer) + len))
1906                                 return -EFAULT;
1907                         len++;
1908                 }
1909                 *lenp = len;
1910                 *ppos += len;
1911         }
1912         return 0;
1913 }
1914
1915 /**
1916  * proc_dostring - read a string sysctl
1917  * @table: the sysctl table
1918  * @write: %TRUE if this is a write to the sysctl file
1919  * @filp: the file structure
1920  * @buffer: the user buffer
1921  * @lenp: the size of the user buffer
1922  * @ppos: file position
1923  *
1924  * Reads/writes a string from/to the user buffer. If the kernel
1925  * buffer provided is not large enough to hold the string, the
1926  * string is truncated. The copied string is %NULL-terminated.
1927  * If the string is being read by the user process, it is copied
1928  * and a newline '\n' is added. It is truncated if the buffer is
1929  * not large enough.
1930  *
1931  * Returns 0 on success.
1932  */
1933 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1934                   void __user *buffer, size_t *lenp, loff_t *ppos)
1935 {
1936         return _proc_do_string(table->data, table->maxlen, write, filp,
1937                                buffer, lenp, ppos);
1938 }
1939
1940
1941 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1942                                  int *valp,
1943                                  int write, void *data)
1944 {
1945         if (write) {
1946                 *valp = *negp ? -*lvalp : *lvalp;
1947         } else {
1948                 int val = *valp;
1949                 if (val < 0) {
1950                         *negp = -1;
1951                         *lvalp = (unsigned long)-val;
1952                 } else {
1953                         *negp = 0;
1954                         *lvalp = (unsigned long)val;
1955                 }
1956         }
1957         return 0;
1958 }
1959
1960 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1961                   int write, struct file *filp, void __user *buffer,
1962                   size_t *lenp, loff_t *ppos,
1963                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1964                               int write, void *data),
1965                   void *data)
1966 {
1967 #define TMPBUFLEN 21
1968         int *i, vleft, first=1, neg, val;
1969         unsigned long lval;
1970         size_t left, len;
1971
1972         char buf[TMPBUFLEN], *p;
1973         char __user *s = buffer;
1974
1975         if (!tbl_data || !table->maxlen || !*lenp ||
1976             (*ppos && !write)) {
1977                 *lenp = 0;
1978                 return 0;
1979         }
1980
1981         i = (int *) tbl_data;
1982         vleft = table->maxlen / sizeof(*i);
1983         left = *lenp;
1984
1985         if (!conv)
1986                 conv = do_proc_dointvec_conv;
1987
1988         for (; left && vleft--; i++, first=0) {
1989                 if (write) {
1990                         while (left) {
1991                                 char c;
1992                                 if (get_user(c, s))
1993                                         return -EFAULT;
1994                                 if (!isspace(c))
1995                                         break;
1996                                 left--;
1997                                 s++;
1998                         }
1999                         if (!left)
2000                                 break;
2001                         neg = 0;
2002                         len = left;
2003                         if (len > sizeof(buf) - 1)
2004                                 len = sizeof(buf) - 1;
2005                         if (copy_from_user(buf, s, len))
2006                                 return -EFAULT;
2007                         buf[len] = 0;
2008                         p = buf;
2009                         if (*p == '-' && left > 1) {
2010                                 neg = 1;
2011                                 p++;
2012                         }
2013                         if (*p < '0' || *p > '9')
2014                                 break;
2015
2016                         lval = simple_strtoul(p, &p, 0);
2017
2018                         len = p-buf;
2019                         if ((len < left) && *p && !isspace(*p))
2020                                 break;
2021                         if (neg)
2022                                 val = -val;
2023                         s += len;
2024                         left -= len;
2025
2026                         if (conv(&neg, &lval, i, 1, data))
2027                                 break;
2028                 } else {
2029                         p = buf;
2030                         if (!first)
2031                                 *p++ = '\t';
2032
2033                         if (conv(&neg, &lval, i, 0, data))
2034                                 break;
2035
2036                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2037                         len = strlen(buf);
2038                         if (len > left)
2039                                 len = left;
2040                         if(copy_to_user(s, buf, len))
2041                                 return -EFAULT;
2042                         left -= len;
2043                         s += len;
2044                 }
2045         }
2046
2047         if (!write && !first && left) {
2048                 if(put_user('\n', s))
2049                         return -EFAULT;
2050                 left--, s++;
2051         }
2052         if (write) {
2053                 while (left) {
2054                         char c;
2055                         if (get_user(c, s++))
2056                                 return -EFAULT;
2057                         if (!isspace(c))
2058                                 break;
2059                         left--;
2060                 }
2061         }
2062         if (write && first)
2063                 return -EINVAL;
2064         *lenp -= left;
2065         *ppos += *lenp;
2066         return 0;
2067 #undef TMPBUFLEN
2068 }
2069
2070 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2071                   void __user *buffer, size_t *lenp, loff_t *ppos,
2072                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2073                               int write, void *data),
2074                   void *data)
2075 {
2076         return __do_proc_dointvec(table->data, table, write, filp,
2077                         buffer, lenp, ppos, conv, data);
2078 }
2079
2080 /**
2081  * proc_dointvec - read a vector of integers
2082  * @table: the sysctl table
2083  * @write: %TRUE if this is a write to the sysctl file
2084  * @filp: the file structure
2085  * @buffer: the user buffer
2086  * @lenp: the size of the user buffer
2087  * @ppos: file position
2088  *
2089  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2090  * values from/to the user buffer, treated as an ASCII string.
2091  *
2092  * Returns 0 on success.
2093  */
2094 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2095                      void __user *buffer, size_t *lenp, loff_t *ppos)
2096 {
2097     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2098                             NULL,NULL);
2099 }
2100
2101 #define OP_SET  0
2102 #define OP_AND  1
2103 #define OP_OR   2
2104
2105 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2106                                       int *valp,
2107                                       int write, void *data)
2108 {
2109         int op = *(int *)data;
2110         if (write) {
2111                 int val = *negp ? -*lvalp : *lvalp;
2112                 switch(op) {
2113                 case OP_SET:    *valp = val; break;
2114                 case OP_AND:    *valp &= val; break;
2115                 case OP_OR:     *valp |= val; break;
2116                 }
2117         } else {
2118                 int val = *valp;
2119                 if (val < 0) {
2120                         *negp = -1;
2121                         *lvalp = (unsigned long)-val;
2122                 } else {
2123                         *negp = 0;
2124                         *lvalp = (unsigned long)val;
2125                 }
2126         }
2127         return 0;
2128 }
2129
2130 /*
2131  *      Taint values can only be increased
2132  */
2133 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2134                                void __user *buffer, size_t *lenp, loff_t *ppos)
2135 {
2136         int op;
2137
2138         if (write && !capable(CAP_SYS_ADMIN))
2139                 return -EPERM;
2140
2141         op = OP_OR;
2142         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2143                                 do_proc_dointvec_bset_conv,&op);
2144 }
2145
2146 struct do_proc_dointvec_minmax_conv_param {
2147         int *min;
2148         int *max;
2149 };
2150
2151 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2152                                         int *valp,
2153                                         int write, void *data)
2154 {
2155         struct do_proc_dointvec_minmax_conv_param *param = data;
2156         if (write) {
2157                 int val = *negp ? -*lvalp : *lvalp;
2158                 if ((param->min && *param->min > val) ||
2159                     (param->max && *param->max < val))
2160                         return -EINVAL;
2161                 *valp = val;
2162         } else {
2163                 int val = *valp;
2164                 if (val < 0) {
2165                         *negp = -1;
2166                         *lvalp = (unsigned long)-val;
2167                 } else {
2168                         *negp = 0;
2169                         *lvalp = (unsigned long)val;
2170                 }
2171         }
2172         return 0;
2173 }
2174
2175 /**
2176  * proc_dointvec_minmax - read a vector of integers with min/max values
2177  * @table: the sysctl table
2178  * @write: %TRUE if this is a write to the sysctl file
2179  * @filp: the file structure
2180  * @buffer: the user buffer
2181  * @lenp: the size of the user buffer
2182  * @ppos: file position
2183  *
2184  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2185  * values from/to the user buffer, treated as an ASCII string.
2186  *
2187  * This routine will ensure the values are within the range specified by
2188  * table->extra1 (min) and table->extra2 (max).
2189  *
2190  * Returns 0 on success.
2191  */
2192 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2193                   void __user *buffer, size_t *lenp, loff_t *ppos)
2194 {
2195         struct do_proc_dointvec_minmax_conv_param param = {
2196                 .min = (int *) table->extra1,
2197                 .max = (int *) table->extra2,
2198         };
2199         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2200                                 do_proc_dointvec_minmax_conv, &param);
2201 }
2202
2203 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2204                                      struct file *filp,
2205                                      void __user *buffer,
2206                                      size_t *lenp, loff_t *ppos,
2207                                      unsigned long convmul,
2208                                      unsigned long convdiv)
2209 {
2210 #define TMPBUFLEN 21
2211         unsigned long *i, *min, *max, val;
2212         int vleft, first=1, neg;
2213         size_t len, left;
2214         char buf[TMPBUFLEN], *p;
2215         char __user *s = buffer;
2216
2217         if (!data || !table->maxlen || !*lenp ||
2218             (*ppos && !write)) {
2219                 *lenp = 0;
2220                 return 0;
2221         }
2222
2223         i = (unsigned long *) data;
2224         min = (unsigned long *) table->extra1;
2225         max = (unsigned long *) table->extra2;
2226         vleft = table->maxlen / sizeof(unsigned long);
2227         left = *lenp;
2228
2229         for (; left && vleft--; i++, min++, max++, first=0) {
2230                 if (write) {
2231                         while (left) {
2232                                 char c;
2233                                 if (get_user(c, s))
2234                                         return -EFAULT;
2235                                 if (!isspace(c))
2236                                         break;
2237                                 left--;
2238                                 s++;
2239                         }
2240                         if (!left)
2241                                 break;
2242                         neg = 0;
2243                         len = left;
2244                         if (len > TMPBUFLEN-1)
2245                                 len = TMPBUFLEN-1;
2246                         if (copy_from_user(buf, s, len))
2247                                 return -EFAULT;
2248                         buf[len] = 0;
2249                         p = buf;
2250                         if (*p == '-' && left > 1) {
2251                                 neg = 1;
2252                                 p++;
2253                         }
2254                         if (*p < '0' || *p > '9')
2255                                 break;
2256                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2257                         len = p-buf;
2258                         if ((len < left) && *p && !isspace(*p))
2259                                 break;
2260                         if (neg)
2261                                 val = -val;
2262                         s += len;
2263                         left -= len;
2264
2265                         if(neg)
2266                                 continue;
2267                         if ((min && val < *min) || (max && val > *max))
2268                                 continue;
2269                         *i = val;
2270                 } else {
2271                         p = buf;
2272                         if (!first)
2273                                 *p++ = '\t';
2274                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2275                         len = strlen(buf);
2276                         if (len > left)
2277                                 len = left;
2278                         if(copy_to_user(s, buf, len))
2279                                 return -EFAULT;
2280                         left -= len;
2281                         s += len;
2282                 }
2283         }
2284
2285         if (!write && !first && left) {
2286                 if(put_user('\n', s))
2287                         return -EFAULT;
2288                 left--, s++;
2289         }
2290         if (write) {
2291                 while (left) {
2292                         char c;
2293                         if (get_user(c, s++))
2294                                 return -EFAULT;
2295                         if (!isspace(c))
2296                                 break;
2297                         left--;
2298                 }
2299         }
2300         if (write && first)
2301                 return -EINVAL;
2302         *lenp -= left;
2303         *ppos += *lenp;
2304         return 0;
2305 #undef TMPBUFLEN
2306 }
2307
2308 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2309                                      struct file *filp,
2310                                      void __user *buffer,
2311                                      size_t *lenp, loff_t *ppos,
2312                                      unsigned long convmul,
2313                                      unsigned long convdiv)
2314 {
2315         return __do_proc_doulongvec_minmax(table->data, table, write,
2316                         filp, buffer, lenp, ppos, convmul, convdiv);
2317 }
2318
2319 /**
2320  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2321  * @table: the sysctl table
2322  * @write: %TRUE if this is a write to the sysctl file
2323  * @filp: the file structure
2324  * @buffer: the user buffer
2325  * @lenp: the size of the user buffer
2326  * @ppos: file position
2327  *
2328  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2329  * values from/to the user buffer, treated as an ASCII string.
2330  *
2331  * This routine will ensure the values are within the range specified by
2332  * table->extra1 (min) and table->extra2 (max).
2333  *
2334  * Returns 0 on success.
2335  */
2336 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2337                            void __user *buffer, size_t *lenp, loff_t *ppos)
2338 {
2339     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2340 }
2341
2342 /**
2343  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2344  * @table: the sysctl table
2345  * @write: %TRUE if this is a write to the sysctl file
2346  * @filp: the file structure
2347  * @buffer: the user buffer
2348  * @lenp: the size of the user buffer
2349  * @ppos: file position
2350  *
2351  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2352  * values from/to the user buffer, treated as an ASCII string. The values
2353  * are treated as milliseconds, and converted to jiffies when they are stored.
2354  *
2355  * This routine will ensure the values are within the range specified by
2356  * table->extra1 (min) and table->extra2 (max).
2357  *
2358  * Returns 0 on success.
2359  */
2360 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2361                                       struct file *filp,
2362                                       void __user *buffer,
2363                                       size_t *lenp, loff_t *ppos)
2364 {
2365     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2366                                      lenp, ppos, HZ, 1000l);
2367 }
2368
2369
2370 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2371                                          int *valp,
2372                                          int write, void *data)
2373 {
2374         if (write) {
2375                 if (*lvalp > LONG_MAX / HZ)
2376                         return 1;
2377                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2378         } else {
2379                 int val = *valp;
2380                 unsigned long lval;
2381                 if (val < 0) {
2382                         *negp = -1;
2383                         lval = (unsigned long)-val;
2384                 } else {
2385                         *negp = 0;
2386                         lval = (unsigned long)val;
2387                 }
2388                 *lvalp = lval / HZ;
2389         }
2390         return 0;
2391 }
2392
2393 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2394                                                 int *valp,
2395                                                 int write, void *data)
2396 {
2397         if (write) {
2398                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2399                         return 1;
2400                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2401         } else {
2402                 int val = *valp;
2403                 unsigned long lval;
2404                 if (val < 0) {
2405                         *negp = -1;
2406                         lval = (unsigned long)-val;
2407                 } else {
2408                         *negp = 0;
2409                         lval = (unsigned long)val;
2410                 }
2411                 *lvalp = jiffies_to_clock_t(lval);
2412         }
2413         return 0;
2414 }
2415
2416 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2417                                             int *valp,
2418                                             int write, void *data)
2419 {
2420         if (write) {
2421                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2422         } else {
2423                 int val = *valp;
2424                 unsigned long lval;
2425                 if (val < 0) {
2426                         *negp = -1;
2427                         lval = (unsigned long)-val;
2428                 } else {
2429                         *negp = 0;
2430                         lval = (unsigned long)val;
2431                 }
2432                 *lvalp = jiffies_to_msecs(lval);
2433         }
2434         return 0;
2435 }
2436
2437 /**
2438  * proc_dointvec_jiffies - read a vector of integers as seconds
2439  * @table: the sysctl table
2440  * @write: %TRUE if this is a write to the sysctl file
2441  * @filp: the file structure
2442  * @buffer: the user buffer
2443  * @lenp: the size of the user buffer
2444  * @ppos: file position
2445  *
2446  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2447  * values from/to the user buffer, treated as an ASCII string.
2448  * The values read are assumed to be in seconds, and are converted into
2449  * jiffies.
2450  *
2451  * Returns 0 on success.
2452  */
2453 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2454                           void __user *buffer, size_t *lenp, loff_t *ppos)
2455 {
2456     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2457                             do_proc_dointvec_jiffies_conv,NULL);
2458 }
2459
2460 /**
2461  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2462  * @table: the sysctl table
2463  * @write: %TRUE if this is a write to the sysctl file
2464  * @filp: the file structure
2465  * @buffer: the user buffer
2466  * @lenp: the size of the user buffer
2467  * @ppos: pointer to the file position
2468  *
2469  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2470  * values from/to the user buffer, treated as an ASCII string.
2471  * The values read are assumed to be in 1/USER_HZ seconds, and
2472  * are converted into jiffies.
2473  *
2474  * Returns 0 on success.
2475  */
2476 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2477                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2478 {
2479     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2480                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2481 }
2482
2483 /**
2484  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2485  * @table: the sysctl table
2486  * @write: %TRUE if this is a write to the sysctl file
2487  * @filp: the file structure
2488  * @buffer: the user buffer
2489  * @lenp: the size of the user buffer
2490  * @ppos: file position
2491  * @ppos: the current position in the file
2492  *
2493  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2494  * values from/to the user buffer, treated as an ASCII string.
2495  * The values read are assumed to be in 1/1000 seconds, and
2496  * are converted into jiffies.
2497  *
2498  * Returns 0 on success.
2499  */
2500 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2501                              void __user *buffer, size_t *lenp, loff_t *ppos)
2502 {
2503         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2504                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2505 }
2506
2507 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2508                            void __user *buffer, size_t *lenp, loff_t *ppos)
2509 {
2510         struct pid *new_pid;
2511         pid_t tmp;
2512         int r;
2513
2514         tmp = pid_vnr(cad_pid);
2515
2516         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2517                                lenp, ppos, NULL, NULL);
2518         if (r || !write)
2519                 return r;
2520
2521         new_pid = find_get_pid(tmp);
2522         if (!new_pid)
2523                 return -ESRCH;
2524
2525         put_pid(xchg(&cad_pid, new_pid));
2526         return 0;
2527 }
2528
2529 #else /* CONFIG_PROC_FS */
2530
2531 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2532                   void __user *buffer, size_t *lenp, loff_t *ppos)
2533 {
2534         return -ENOSYS;
2535 }
2536
2537 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2538                   void __user *buffer, size_t *lenp, loff_t *ppos)
2539 {
2540         return -ENOSYS;
2541 }
2542
2543 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2544                     void __user *buffer, size_t *lenp, loff_t *ppos)
2545 {
2546         return -ENOSYS;
2547 }
2548
2549 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2550                     void __user *buffer, size_t *lenp, loff_t *ppos)
2551 {
2552         return -ENOSYS;
2553 }
2554
2555 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2556                     void __user *buffer, size_t *lenp, loff_t *ppos)
2557 {
2558         return -ENOSYS;
2559 }
2560
2561 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2562                              void __user *buffer, size_t *lenp, loff_t *ppos)
2563 {
2564         return -ENOSYS;
2565 }
2566
2567 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2568                     void __user *buffer, size_t *lenp, loff_t *ppos)
2569 {
2570         return -ENOSYS;
2571 }
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 -ENOSYS;
2579 }
2580
2581
2582 #endif /* CONFIG_PROC_FS */
2583
2584
2585 #ifdef CONFIG_SYSCTL_SYSCALL
2586 /*
2587  * General sysctl support routines
2588  */
2589
2590 /* The generic sysctl data routine (used if no strategy routine supplied) */
2591 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2592                 void __user *oldval, size_t __user *oldlenp,
2593                 void __user *newval, size_t newlen)
2594 {
2595         size_t len;
2596
2597         /* Get out of I don't have a variable */
2598         if (!table->data || !table->maxlen)
2599                 return -ENOTDIR;
2600
2601         if (oldval && oldlenp) {
2602                 if (get_user(len, oldlenp))
2603                         return -EFAULT;
2604                 if (len) {
2605                         if (len > table->maxlen)
2606                                 len = table->maxlen;
2607                         if (copy_to_user(oldval, table->data, len))
2608                                 return -EFAULT;
2609                         if (put_user(len, oldlenp))
2610                                 return -EFAULT;
2611                 }
2612         }
2613
2614         if (newval && newlen) {
2615                 if (newlen > table->maxlen)
2616                         newlen = table->maxlen;
2617
2618                 if (copy_from_user(table->data, newval, newlen))
2619                         return -EFAULT;
2620         }
2621         return 1;
2622 }
2623
2624 /* The generic string strategy routine: */
2625 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2626                   void __user *oldval, size_t __user *oldlenp,
2627                   void __user *newval, size_t newlen)
2628 {
2629         if (!table->data || !table->maxlen)
2630                 return -ENOTDIR;
2631
2632         if (oldval && oldlenp) {
2633                 size_t bufsize;
2634                 if (get_user(bufsize, oldlenp))
2635                         return -EFAULT;
2636                 if (bufsize) {
2637                         size_t len = strlen(table->data), copied;
2638
2639                         /* This shouldn't trigger for a well-formed sysctl */
2640                         if (len > table->maxlen)
2641                                 len = table->maxlen;
2642
2643                         /* Copy up to a max of bufsize-1 bytes of the string */
2644                         copied = (len >= bufsize) ? bufsize - 1 : len;
2645
2646                         if (copy_to_user(oldval, table->data, copied) ||
2647                             put_user(0, (char __user *)(oldval + copied)))
2648                                 return -EFAULT;
2649                         if (put_user(len, oldlenp))
2650                                 return -EFAULT;
2651                 }
2652         }
2653         if (newval && newlen) {
2654                 size_t len = newlen;
2655                 if (len > table->maxlen)
2656                         len = table->maxlen;
2657                 if(copy_from_user(table->data, newval, len))
2658                         return -EFAULT;
2659                 if (len == table->maxlen)
2660                         len--;
2661                 ((char *) table->data)[len] = 0;
2662         }
2663         return 1;
2664 }
2665
2666 /*
2667  * This function makes sure that all of the integers in the vector
2668  * are between the minimum and maximum values given in the arrays
2669  * table->extra1 and table->extra2, respectively.
2670  */
2671 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2672                 void __user *oldval, size_t __user *oldlenp,
2673                 void __user *newval, size_t newlen)
2674 {
2675
2676         if (newval && newlen) {
2677                 int __user *vec = (int __user *) newval;
2678                 int *min = (int *) table->extra1;
2679                 int *max = (int *) table->extra2;
2680                 size_t length;
2681                 int i;
2682
2683                 if (newlen % sizeof(int) != 0)
2684                         return -EINVAL;
2685
2686                 if (!table->extra1 && !table->extra2)
2687                         return 0;
2688
2689                 if (newlen > table->maxlen)
2690                         newlen = table->maxlen;
2691                 length = newlen / sizeof(int);
2692
2693                 for (i = 0; i < length; i++) {
2694                         int value;
2695                         if (get_user(value, vec + i))
2696                                 return -EFAULT;
2697                         if (min && value < min[i])
2698                                 return -EINVAL;
2699                         if (max && value > max[i])
2700                                 return -EINVAL;
2701                 }
2702         }
2703         return 0;
2704 }
2705
2706 /* Strategy function to convert jiffies to seconds */
2707 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2708                 void __user *oldval, size_t __user *oldlenp,
2709                 void __user *newval, size_t newlen)
2710 {
2711         if (oldval && oldlenp) {
2712                 size_t olen;
2713
2714                 if (get_user(olen, oldlenp))
2715                         return -EFAULT;
2716                 if (olen) {
2717                         int val;
2718
2719                         if (olen < sizeof(int))
2720                                 return -EINVAL;
2721
2722                         val = *(int *)(table->data) / HZ;
2723                         if (put_user(val, (int __user *)oldval))
2724                                 return -EFAULT;
2725                         if (put_user(sizeof(int), oldlenp))
2726                                 return -EFAULT;
2727                 }
2728         }
2729         if (newval && newlen) {
2730                 int new;
2731                 if (newlen != sizeof(int))
2732                         return -EINVAL;
2733                 if (get_user(new, (int __user *)newval))
2734                         return -EFAULT;
2735                 *(int *)(table->data) = new*HZ;
2736         }
2737         return 1;
2738 }
2739
2740 /* Strategy function to convert jiffies to seconds */
2741 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2742                 void __user *oldval, size_t __user *oldlenp,
2743                 void __user *newval, size_t newlen)
2744 {
2745         if (oldval && oldlenp) {
2746                 size_t olen;
2747
2748                 if (get_user(olen, oldlenp))
2749                         return -EFAULT;
2750                 if (olen) {
2751                         int val;
2752
2753                         if (olen < sizeof(int))
2754                                 return -EINVAL;
2755
2756                         val = jiffies_to_msecs(*(int *)(table->data));
2757                         if (put_user(val, (int __user *)oldval))
2758                                 return -EFAULT;
2759                         if (put_user(sizeof(int), oldlenp))
2760                                 return -EFAULT;
2761                 }
2762         }
2763         if (newval && newlen) {
2764                 int new;
2765                 if (newlen != sizeof(int))
2766                         return -EINVAL;
2767                 if (get_user(new, (int __user *)newval))
2768                         return -EFAULT;
2769                 *(int *)(table->data) = msecs_to_jiffies(new);
2770         }
2771         return 1;
2772 }
2773
2774
2775
2776 #else /* CONFIG_SYSCTL_SYSCALL */
2777
2778
2779 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2780 {
2781         struct __sysctl_args tmp;
2782         int error;
2783
2784         if (copy_from_user(&tmp, args, sizeof(tmp)))
2785                 return -EFAULT;
2786
2787         error = deprecated_sysctl_warning(&tmp);
2788
2789         /* If no error reading the parameters then just -ENOSYS ... */
2790         if (!error)
2791                 error = -ENOSYS;
2792
2793         return error;
2794 }
2795
2796 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2797                   void __user *oldval, size_t __user *oldlenp,
2798                   void __user *newval, size_t newlen)
2799 {
2800         return -ENOSYS;
2801 }
2802
2803 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2804                   void __user *oldval, size_t __user *oldlenp,
2805                   void __user *newval, size_t newlen)
2806 {
2807         return -ENOSYS;
2808 }
2809
2810 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2811                 void __user *oldval, size_t __user *oldlenp,
2812                 void __user *newval, size_t newlen)
2813 {
2814         return -ENOSYS;
2815 }
2816
2817 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2818                 void __user *oldval, size_t __user *oldlenp,
2819                 void __user *newval, size_t newlen)
2820 {
2821         return -ENOSYS;
2822 }
2823
2824 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2825                 void __user *oldval, size_t __user *oldlenp,
2826                 void __user *newval, size_t newlen)
2827 {
2828         return -ENOSYS;
2829 }
2830
2831 #endif /* CONFIG_SYSCTL_SYSCALL */
2832
2833 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2834 {
2835         static int msg_count;
2836         int name[CTL_MAXNAME];
2837         int i;
2838
2839         /* Check args->nlen. */
2840         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2841                 return -ENOTDIR;
2842
2843         /* Read in the sysctl name for better debug message logging */
2844         for (i = 0; i < args->nlen; i++)
2845                 if (get_user(name[i], args->name + i))
2846                         return -EFAULT;
2847
2848         /* Ignore accesses to kernel.version */
2849         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2850                 return 0;
2851
2852         if (msg_count < 5) {
2853                 msg_count++;
2854                 printk(KERN_INFO
2855                         "warning: process `%s' used the deprecated sysctl "
2856                         "system call with ", current->comm);
2857                 for (i = 0; i < args->nlen; i++)
2858                         printk("%d.", name[i]);
2859                 printk("\n");
2860         }
2861         return 0;
2862 }
2863
2864 /*
2865  * No sense putting this after each symbol definition, twice,
2866  * exception granted :-)
2867  */
2868 EXPORT_SYMBOL(proc_dointvec);
2869 EXPORT_SYMBOL(proc_dointvec_jiffies);
2870 EXPORT_SYMBOL(proc_dointvec_minmax);
2871 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2872 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2873 EXPORT_SYMBOL(proc_dostring);
2874 EXPORT_SYMBOL(proc_doulongvec_minmax);
2875 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2876 EXPORT_SYMBOL(register_sysctl_table);
2877 EXPORT_SYMBOL(register_sysctl_paths);
2878 EXPORT_SYMBOL(sysctl_intvec);
2879 EXPORT_SYMBOL(sysctl_jiffies);
2880 EXPORT_SYMBOL(sysctl_ms_jiffies);
2881 EXPORT_SYMBOL(sysctl_string);
2882 EXPORT_SYMBOL(sysctl_data);
2883 EXPORT_SYMBOL(unregister_sysctl_table);