kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/initrd.h>
  41 #include <linux/key.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/vmstat.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/acpi.h>
  49 #include <linux/reboot.h>
  50 #include <linux/ftrace.h>
  51
  52 #include <asm/uaccess.h>
  53 #include <asm/processor.h>
  54
  55 #ifdef CONFIG_X86
  56 #include <asm/nmi.h>
  57 #include <asm/stacktrace.h>
  58 #include <asm/io.h>
  59 #endif
  60
  61 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  62
  63 #if defined(CONFIG_SYSCTL)
  64
  65 /* External variables not in a header file. */
  66 extern int C_A_D;
  67 extern int print_fatal_signals;
  68 extern int sysctl_overcommit_memory;
  69 extern int sysctl_overcommit_ratio;
  70 extern int sysctl_panic_on_oom;
  71 extern int sysctl_oom_kill_allocating_task;
  72 extern int sysctl_oom_dump_tasks;
  73 extern int max_threads;
  74 extern int core_uses_pid;
  75 extern int suid_dumpable;
  76 extern char core_pattern[];
  77 extern int pid_max;
  78 extern int min_free_kbytes;
  79 extern int pid_max_min, pid_max_max;
  80 extern int sysctl_drop_caches;
  81 extern int percpu_pagelist_fraction;
  82 extern int compat_log;
  83 extern int 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           = NULL,
 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           = NULL,
 989                 .maxlen         = sizeof(unsigned long),
 990                 .mode           = 0644,
 991                 .proc_handler   = &hugetlb_overcommit_handler,
 992                 .extra1         = (void *)&hugetlb_zero,
 993                 .extra2         = (void *)&hugetlb_infinity,
 994         },
 995 #endif
 996         {
 997                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 998                 .procname       = "lowmem_reserve_ratio",
 999                 .data           = &sysctl_lowmem_reserve_ratio,
1000                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1001                 .mode           = 0644,
1002                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1003                 .strategy       = &sysctl_intvec,
1004         },
1005         {
1006                 .ctl_name       = VM_DROP_PAGECACHE,
1007                 .procname       = "drop_caches",
1008                 .data           = &sysctl_drop_caches,
1009                 .maxlen         = sizeof(int),
1010                 .mode           = 0644,
1011                 .proc_handler   = drop_caches_sysctl_handler,
1012                 .strategy       = &sysctl_intvec,
1013         },
1014         {
1015                 .ctl_name       = VM_MIN_FREE_KBYTES,
1016                 .procname       = "min_free_kbytes",
1017                 .data           = &min_free_kbytes,
1018                 .maxlen         = sizeof(min_free_kbytes),
1019                 .mode           = 0644,
1020                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1021                 .strategy       = &sysctl_intvec,
1022                 .extra1         = &zero,
1023         },
1024         {
1025                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1026                 .procname       = "percpu_pagelist_fraction",
1027                 .data           = &percpu_pagelist_fraction,
1028                 .maxlen         = sizeof(percpu_pagelist_fraction),
1029                 .mode           = 0644,
1030                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1031                 .strategy       = &sysctl_intvec,
1032                 .extra1         = &min_percpu_pagelist_fract,
1033         },
1034 #ifdef CONFIG_MMU
1035         {
1036                 .ctl_name       = VM_MAX_MAP_COUNT,
1037                 .procname       = "max_map_count",
1038                 .data           = &sysctl_max_map_count,
1039                 .maxlen         = sizeof(sysctl_max_map_count),
1040                 .mode           = 0644,
1041                 .proc_handler   = &proc_dointvec
1042         },
1043 #endif
1044         {
1045                 .ctl_name       = VM_LAPTOP_MODE,
1046                 .procname       = "laptop_mode",
1047                 .data           = &laptop_mode,
1048                 .maxlen         = sizeof(laptop_mode),
1049                 .mode           = 0644,
1050                 .proc_handler   = &proc_dointvec_jiffies,
1051                 .strategy       = &sysctl_jiffies,
1052         },
1053         {
1054                 .ctl_name       = VM_BLOCK_DUMP,
1055                 .procname       = "block_dump",
1056                 .data           = &block_dump,
1057                 .maxlen         = sizeof(block_dump),
1058                 .mode           = 0644,
1059                 .proc_handler   = &proc_dointvec,
1060                 .strategy       = &sysctl_intvec,
1061                 .extra1         = &zero,
1062         },
1063         {
1064                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1065                 .procname       = "vfs_cache_pressure",
1066                 .data           = &sysctl_vfs_cache_pressure,
1067                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1068                 .mode           = 0644,
1069                 .proc_handler   = &proc_dointvec,
1070                 .strategy       = &sysctl_intvec,
1071                 .extra1         = &zero,
1072         },
1073 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1074         {
1075                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1076                 .procname       = "legacy_va_layout",
1077                 .data           = &sysctl_legacy_va_layout,
1078                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1079                 .mode           = 0644,
1080                 .proc_handler   = &proc_dointvec,
1081                 .strategy       = &sysctl_intvec,
1082                 .extra1         = &zero,
1083         },
1084 #endif
1085 #ifdef CONFIG_NUMA
1086         {
1087                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1088                 .procname       = "zone_reclaim_mode",
1089                 .data           = &zone_reclaim_mode,
1090                 .maxlen         = sizeof(zone_reclaim_mode),
1091                 .mode           = 0644,
1092                 .proc_handler   = &proc_dointvec,
1093                 .strategy       = &sysctl_intvec,
1094                 .extra1         = &zero,
1095         },
1096         {
1097                 .ctl_name       = VM_MIN_UNMAPPED,
1098                 .procname       = "min_unmapped_ratio",
1099                 .data           = &sysctl_min_unmapped_ratio,
1100                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1101                 .mode           = 0644,
1102                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1103                 .strategy       = &sysctl_intvec,
1104                 .extra1         = &zero,
1105                 .extra2         = &one_hundred,
1106         },
1107         {
1108                 .ctl_name       = VM_MIN_SLAB,
1109                 .procname       = "min_slab_ratio",
1110                 .data           = &sysctl_min_slab_ratio,
1111                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1112                 .mode           = 0644,
1113                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1114                 .strategy       = &sysctl_intvec,
1115                 .extra1         = &zero,
1116                 .extra2         = &one_hundred,
1117         },
1118 #endif
1119 #ifdef CONFIG_SMP
1120         {
1121                 .ctl_name       = CTL_UNNUMBERED,
1122                 .procname       = "stat_interval",
1123                 .data           = &sysctl_stat_interval,
1124                 .maxlen         = sizeof(sysctl_stat_interval),
1125                 .mode           = 0644,
1126                 .proc_handler   = &proc_dointvec_jiffies,
1127                 .strategy       = &sysctl_jiffies,
1128         },
1129 #endif
1130 #ifdef CONFIG_SECURITY
1131         {
1132                 .ctl_name       = CTL_UNNUMBERED,
1133                 .procname       = "mmap_min_addr",
1134                 .data           = &mmap_min_addr,
1135                 .maxlen         = sizeof(unsigned long),
1136                 .mode           = 0644,
1137                 .proc_handler   = &proc_doulongvec_minmax,
1138         },
1139 #endif
1140 #ifdef CONFIG_NUMA
1141         {
1142                 .ctl_name       = CTL_UNNUMBERED,
1143                 .procname       = "numa_zonelist_order",
1144                 .data           = &numa_zonelist_order,
1145                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1146                 .mode           = 0644,
1147                 .proc_handler   = &numa_zonelist_order_handler,
1148                 .strategy       = &sysctl_string,
1149         },
1150 #endif
1151 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1152    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1153         {
1154                 .ctl_name       = VM_VDSO_ENABLED,
1155                 .procname       = "vdso_enabled",
1156                 .data           = &vdso_enabled,
1157                 .maxlen         = sizeof(vdso_enabled),
1158                 .mode           = 0644,
1159                 .proc_handler   = &proc_dointvec,
1160                 .strategy       = &sysctl_intvec,
1161                 .extra1         = &zero,
1162         },
1163 #endif
1164 #ifdef CONFIG_HIGHMEM
1165         {
1166                 .ctl_name       = CTL_UNNUMBERED,
1167                 .procname       = "highmem_is_dirtyable",
1168                 .data           = &vm_highmem_is_dirtyable,
1169                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1170                 .mode           = 0644,
1171                 .proc_handler   = &proc_dointvec_minmax,
1172                 .strategy       = &sysctl_intvec,
1173                 .extra1         = &zero,
1174                 .extra2         = &one,
1175         },
1176 #endif
1177 /*
1178  * NOTE: do not add new entries to this table unless you have read
1179  * Documentation/sysctl/ctl_unnumbered.txt
1180  */
1181         { .ctl_name = 0 }
1182 };
1183
1184 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1185 static struct ctl_table binfmt_misc_table[] = {
1186         { .ctl_name = 0 }
1187 };
1188 #endif
1189
1190 static struct ctl_table fs_table[] = {
1191         {
1192                 .ctl_name       = FS_NRINODE,
1193                 .procname       = "inode-nr",
1194                 .data           = &inodes_stat,
1195                 .maxlen         = 2*sizeof(int),
1196                 .mode           = 0444,
1197                 .proc_handler   = &proc_dointvec,
1198         },
1199         {
1200                 .ctl_name       = FS_STATINODE,
1201                 .procname       = "inode-state",
1202                 .data           = &inodes_stat,
1203                 .maxlen         = 7*sizeof(int),
1204                 .mode           = 0444,
1205                 .proc_handler   = &proc_dointvec,
1206         },
1207         {
1208                 .procname       = "file-nr",
1209                 .data           = &files_stat,
1210                 .maxlen         = 3*sizeof(int),
1211                 .mode           = 0444,
1212                 .proc_handler   = &proc_nr_files,
1213         },
1214         {
1215                 .ctl_name       = FS_MAXFILE,
1216                 .procname       = "file-max",
1217                 .data           = &files_stat.max_files,
1218                 .maxlen         = sizeof(int),
1219                 .mode           = 0644,
1220                 .proc_handler   = &proc_dointvec,
1221         },
1222         {
1223                 .ctl_name       = CTL_UNNUMBERED,
1224                 .procname       = "nr_open",
1225                 .data           = &sysctl_nr_open,
1226                 .maxlen         = sizeof(int),
1227                 .mode           = 0644,
1228                 .proc_handler   = &proc_dointvec_minmax,
1229                 .extra1         = &sysctl_nr_open_min,
1230                 .extra2         = &sysctl_nr_open_max,
1231         },
1232         {
1233                 .ctl_name       = FS_DENTRY,
1234                 .procname       = "dentry-state",
1235                 .data           = &dentry_stat,
1236                 .maxlen         = 6*sizeof(int),
1237                 .mode           = 0444,
1238                 .proc_handler   = &proc_dointvec,
1239         },
1240         {
1241                 .ctl_name       = FS_OVERFLOWUID,
1242                 .procname       = "overflowuid",
1243                 .data           = &fs_overflowuid,
1244                 .maxlen         = sizeof(int),
1245                 .mode           = 0644,
1246                 .proc_handler   = &proc_dointvec_minmax,
1247                 .strategy       = &sysctl_intvec,
1248                 .extra1         = &minolduid,
1249                 .extra2         = &maxolduid,
1250         },
1251         {
1252                 .ctl_name       = FS_OVERFLOWGID,
1253                 .procname       = "overflowgid",
1254                 .data           = &fs_overflowgid,
1255                 .maxlen         = sizeof(int),
1256                 .mode           = 0644,
1257                 .proc_handler   = &proc_dointvec_minmax,
1258                 .strategy       = &sysctl_intvec,
1259                 .extra1         = &minolduid,
1260                 .extra2         = &maxolduid,
1261         },
1262         {
1263                 .ctl_name       = FS_LEASES,
1264                 .procname       = "leases-enable",
1265                 .data           = &leases_enable,
1266                 .maxlen         = sizeof(int),
1267                 .mode           = 0644,
1268                 .proc_handler   = &proc_dointvec,
1269         },
1270 #ifdef CONFIG_DNOTIFY
1271         {
1272                 .ctl_name       = FS_DIR_NOTIFY,
1273                 .procname       = "dir-notify-enable",
1274                 .data           = &dir_notify_enable,
1275                 .maxlen         = sizeof(int),
1276                 .mode           = 0644,
1277                 .proc_handler   = &proc_dointvec,
1278         },
1279 #endif
1280 #ifdef CONFIG_MMU
1281         {
1282                 .ctl_name       = FS_LEASE_TIME,
1283                 .procname       = "lease-break-time",
1284                 .data           = &lease_break_time,
1285                 .maxlen         = sizeof(int),
1286                 .mode           = 0644,
1287                 .proc_handler   = &proc_dointvec_minmax,
1288                 .strategy       = &sysctl_intvec,
1289                 .extra1         = &zero,
1290                 .extra2         = &two,
1291         },
1292         {
1293                 .procname       = "aio-nr",
1294                 .data           = &aio_nr,
1295                 .maxlen         = sizeof(aio_nr),
1296                 .mode           = 0444,
1297                 .proc_handler   = &proc_doulongvec_minmax,
1298         },
1299         {
1300                 .procname       = "aio-max-nr",
1301                 .data           = &aio_max_nr,
1302                 .maxlen         = sizeof(aio_max_nr),
1303                 .mode           = 0644,
1304                 .proc_handler   = &proc_doulongvec_minmax,
1305         },
1306 #ifdef CONFIG_INOTIFY_USER
1307         {
1308                 .ctl_name       = FS_INOTIFY,
1309                 .procname       = "inotify",
1310                 .mode           = 0555,
1311                 .child          = inotify_table,
1312         },
1313 #endif
1314 #endif
1315         {
1316                 .ctl_name       = KERN_SETUID_DUMPABLE,
1317                 .procname       = "suid_dumpable",
1318                 .data           = &suid_dumpable,
1319                 .maxlen         = sizeof(int),
1320                 .mode           = 0644,
1321                 .proc_handler   = &proc_dointvec,
1322         },
1323 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1324         {
1325                 .ctl_name       = CTL_UNNUMBERED,
1326                 .procname       = "binfmt_misc",
1327                 .mode           = 0555,
1328                 .child          = binfmt_misc_table,
1329         },
1330 #endif
1331 /*
1332  * NOTE: do not add new entries to this table unless you have read
1333  * Documentation/sysctl/ctl_unnumbered.txt
1334  */
1335         { .ctl_name = 0 }
1336 };
1337
1338 static struct ctl_table debug_table[] = {
1339 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1340         {
1341                 .ctl_name       = CTL_UNNUMBERED,
1342                 .procname       = "exception-trace",
1343                 .data           = &show_unhandled_signals,
1344                 .maxlen         = sizeof(int),
1345                 .mode           = 0644,
1346                 .proc_handler   = proc_dointvec
1347         },
1348 #endif
1349         { .ctl_name = 0 }
1350 };
1351
1352 static struct ctl_table dev_table[] = {
1353         { .ctl_name = 0 }
1354 };
1355
1356 static DEFINE_SPINLOCK(sysctl_lock);
1357
1358 /* called under sysctl_lock */
1359 static int use_table(struct ctl_table_header *p)
1360 {
1361         if (unlikely(p->unregistering))
1362                 return 0;
1363         p->used++;
1364         return 1;
1365 }
1366
1367 /* called under sysctl_lock */
1368 static void unuse_table(struct ctl_table_header *p)
1369 {
1370         if (!--p->used)
1371                 if (unlikely(p->unregistering))
1372                         complete(p->unregistering);
1373 }
1374
1375 /* called under sysctl_lock, will reacquire if has to wait */
1376 static void start_unregistering(struct ctl_table_header *p)
1377 {
1378         /*
1379          * if p->used is 0, nobody will ever touch that entry again;
1380          * we'll eliminate all paths to it before dropping sysctl_lock
1381          */
1382         if (unlikely(p->used)) {
1383                 struct completion wait;
1384                 init_completion(&wait);
1385                 p->unregistering = &wait;
1386                 spin_unlock(&sysctl_lock);
1387                 wait_for_completion(&wait);
1388                 spin_lock(&sysctl_lock);
1389         }
1390         /*
1391          * do not remove from the list until nobody holds it; walking the
1392          * list in do_sysctl() relies on that.
1393          */
1394         list_del_init(&p->ctl_entry);
1395 }
1396
1397 void sysctl_head_finish(struct ctl_table_header *head)
1398 {
1399         if (!head)
1400                 return;
1401         spin_lock(&sysctl_lock);
1402         unuse_table(head);
1403         spin_unlock(&sysctl_lock);
1404 }
1405
1406 static struct list_head *
1407 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1408 {
1409         struct list_head *header_list;
1410         header_list = &root->header_list;
1411         if (root->lookup)
1412                 header_list = root->lookup(root, namespaces);
1413         return header_list;
1414 }
1415
1416 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1417                                             struct ctl_table_header *prev)
1418 {
1419         struct ctl_table_root *root;
1420         struct list_head *header_list;
1421         struct ctl_table_header *head;
1422         struct list_head *tmp;
1423
1424         spin_lock(&sysctl_lock);
1425         if (prev) {
1426                 head = prev;
1427                 tmp = &prev->ctl_entry;
1428                 unuse_table(prev);
1429                 goto next;
1430         }
1431         tmp = &root_table_header.ctl_entry;
1432         for (;;) {
1433                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1434
1435                 if (!use_table(head))
1436                         goto next;
1437                 spin_unlock(&sysctl_lock);
1438                 return head;
1439         next:
1440                 root = head->root;
1441                 tmp = tmp->next;
1442                 header_list = lookup_header_list(root, namespaces);
1443                 if (tmp != header_list)
1444                         continue;
1445
1446                 do {
1447                         root = list_entry(root->root_list.next,
1448                                         struct ctl_table_root, root_list);
1449                         if (root == &sysctl_table_root)
1450                                 goto out;
1451                         header_list = lookup_header_list(root, namespaces);
1452                 } while (list_empty(header_list));
1453                 tmp = header_list->next;
1454         }
1455 out:
1456         spin_unlock(&sysctl_lock);
1457         return NULL;
1458 }
1459
1460 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1461 {
1462         return __sysctl_head_next(current->nsproxy, prev);
1463 }
1464
1465 void register_sysctl_root(struct ctl_table_root *root)
1466 {
1467         spin_lock(&sysctl_lock);
1468         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1469         spin_unlock(&sysctl_lock);
1470 }
1471
1472 #ifdef CONFIG_SYSCTL_SYSCALL
1473 /* Perform the actual read/write of a sysctl table entry. */
1474 static int do_sysctl_strategy(struct ctl_table_root *root,
1475                         struct ctl_table *table,
1476                         int __user *name, int nlen,
1477                         void __user *oldval, size_t __user *oldlenp,
1478                         void __user *newval, size_t newlen)
1479 {
1480         int op = 0, rc;
1481
1482         if (oldval)
1483                 op |= 004;
1484         if (newval)
1485                 op |= 002;
1486         if (sysctl_perm(root, table, op))
1487                 return -EPERM;
1488
1489         if (table->strategy) {
1490                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1491                                      newval, newlen);
1492                 if (rc < 0)
1493                         return rc;
1494                 if (rc > 0)
1495                         return 0;
1496         }
1497
1498         /* If there is no strategy routine, or if the strategy returns
1499          * zero, proceed with automatic r/w */
1500         if (table->data && table->maxlen) {
1501                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1502                                  newval, newlen);
1503                 if (rc < 0)
1504                         return rc;
1505         }
1506         return 0;
1507 }
1508
1509 static int parse_table(int __user *name, int nlen,
1510                        void __user *oldval, size_t __user *oldlenp,
1511                        void __user *newval, size_t newlen,
1512                        struct ctl_table_root *root,
1513                        struct ctl_table *table)
1514 {
1515         int n;
1516 repeat:
1517         if (!nlen)
1518                 return -ENOTDIR;
1519         if (get_user(n, name))
1520                 return -EFAULT;
1521         for ( ; table->ctl_name || table->procname; table++) {
1522                 if (!table->ctl_name)
1523                         continue;
1524                 if (n == table->ctl_name) {
1525                         int error;
1526                         if (table->child) {
1527                                 if (sysctl_perm(root, table, 001))
1528                                         return -EPERM;
1529                                 name++;
1530                                 nlen--;
1531                                 table = table->child;
1532                                 goto repeat;
1533                         }
1534                         error = do_sysctl_strategy(root, table, name, nlen,
1535                                                    oldval, oldlenp,
1536                                                    newval, newlen);
1537                         return error;
1538                 }
1539         }
1540         return -ENOTDIR;
1541 }
1542
1543 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1544                void __user *newval, size_t newlen)
1545 {
1546         struct ctl_table_header *head;
1547         int error = -ENOTDIR;
1548
1549         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1550                 return -ENOTDIR;
1551         if (oldval) {
1552                 int old_len;
1553                 if (!oldlenp || get_user(old_len, oldlenp))
1554                         return -EFAULT;
1555         }
1556
1557         for (head = sysctl_head_next(NULL); head;
1558                         head = sysctl_head_next(head)) {
1559                 error = parse_table(name, nlen, oldval, oldlenp,
1560                                         newval, newlen,
1561                                         head->root, head->ctl_table);
1562                 if (error != -ENOTDIR) {
1563                         sysctl_head_finish(head);
1564                         break;
1565                 }
1566         }
1567         return error;
1568 }
1569
1570 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1571 {
1572         struct __sysctl_args tmp;
1573         int error;
1574
1575         if (copy_from_user(&tmp, args, sizeof(tmp)))
1576                 return -EFAULT;
1577
1578         error = deprecated_sysctl_warning(&tmp);
1579         if (error)
1580                 goto out;
1581
1582         lock_kernel();
1583         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1584                           tmp.newval, tmp.newlen);
1585         unlock_kernel();
1586 out:
1587         return error;
1588 }
1589 #endif /* CONFIG_SYSCTL_SYSCALL */
1590
1591 /*
1592  * sysctl_perm does NOT grant the superuser all rights automatically, because
1593  * some sysctl variables are readonly even to root.
1594  */
1595
1596 static int test_perm(int mode, int op)
1597 {
1598         if (!current->euid)
1599                 mode >>= 6;
1600         else if (in_egroup_p(0))
1601                 mode >>= 3;
1602         if ((mode & op & 0007) == op)
1603                 return 0;
1604         return -EACCES;
1605 }
1606
1607 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1608 {
1609         int error;
1610         int mode;
1611
1612         error = security_sysctl(table, op);
1613         if (error)
1614                 return error;
1615
1616         if (root->permissions)
1617                 mode = root->permissions(root, current->nsproxy, table);
1618         else
1619                 mode = table->mode;
1620
1621         return test_perm(mode, op);
1622 }
1623
1624 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1625 {
1626         for (; table->ctl_name || table->procname; table++) {
1627                 table->parent = parent;
1628                 if (table->child)
1629                         sysctl_set_parent(table, table->child);
1630         }
1631 }
1632
1633 static __init int sysctl_init(void)
1634 {
1635         sysctl_set_parent(NULL, root_table);
1636 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1637         {
1638                 int err;
1639                 err = sysctl_check_table(current->nsproxy, root_table);
1640         }
1641 #endif
1642         return 0;
1643 }
1644
1645 core_initcall(sysctl_init);
1646
1647 /**
1648  * __register_sysctl_paths - register a sysctl hierarchy
1649  * @root: List of sysctl headers to register on
1650  * @namespaces: Data to compute which lists of sysctl entries are visible
1651  * @path: The path to the directory the sysctl table is in.
1652  * @table: the top-level table structure
1653  *
1654  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1655  * array. A completely 0 filled entry terminates the table.
1656  *
1657  * The members of the &struct ctl_table structure are used as follows:
1658  *
1659  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1660  *            must be unique within that level of sysctl
1661  *
1662  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1663  *            enter a sysctl file
1664  *
1665  * data - a pointer to data for use by proc_handler
1666  *
1667  * maxlen - the maximum size in bytes of the data
1668  *
1669  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1670  *
1671  * child - a pointer to the child sysctl table if this entry is a directory, or
1672  *         %NULL.
1673  *
1674  * proc_handler - the text handler routine (described below)
1675  *
1676  * strategy - the strategy routine (described below)
1677  *
1678  * de - for internal use by the sysctl routines
1679  *
1680  * extra1, extra2 - extra pointers usable by the proc handler routines
1681  *
1682  * Leaf nodes in the sysctl tree will be represented by a single file
1683  * under /proc; non-leaf nodes will be represented by directories.
1684  *
1685  * sysctl(2) can automatically manage read and write requests through
1686  * the sysctl table.  The data and maxlen fields of the ctl_table
1687  * struct enable minimal validation of the values being written to be
1688  * performed, and the mode field allows minimal authentication.
1689  *
1690  * More sophisticated management can be enabled by the provision of a
1691  * strategy routine with the table entry.  This will be called before
1692  * any automatic read or write of the data is performed.
1693  *
1694  * The strategy routine may return
1695  *
1696  * < 0 - Error occurred (error is passed to user process)
1697  *
1698  * 0   - OK - proceed with automatic read or write.
1699  *
1700  * > 0 - OK - read or write has been done by the strategy routine, so
1701  *       return immediately.
1702  *
1703  * There must be a proc_handler routine for any terminal nodes
1704  * mirrored under /proc/sys (non-terminals are handled by a built-in
1705  * directory handler).  Several default handlers are available to
1706  * cover common cases -
1707  *
1708  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1709  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1710  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1711  *
1712  * It is the handler's job to read the input buffer from user memory
1713  * and process it. The handler should return 0 on success.
1714  *
1715  * This routine returns %NULL on a failure to register, and a pointer
1716  * to the table header on success.
1717  */
1718 struct ctl_table_header *__register_sysctl_paths(
1719         struct ctl_table_root *root,
1720         struct nsproxy *namespaces,
1721         const struct ctl_path *path, struct ctl_table *table)
1722 {
1723         struct list_head *header_list;
1724         struct ctl_table_header *header;
1725         struct ctl_table *new, **prevp;
1726         unsigned int n, npath;
1727
1728         /* Count the path components */
1729         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1730                 ;
1731
1732         /*
1733          * For each path component, allocate a 2-element ctl_table array.
1734          * The first array element will be filled with the sysctl entry
1735          * for this, the second will be the sentinel (ctl_name == 0).
1736          *
1737          * We allocate everything in one go so that we don't have to
1738          * worry about freeing additional memory in unregister_sysctl_table.
1739          */
1740         header = kzalloc(sizeof(struct ctl_table_header) +
1741                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1742         if (!header)
1743                 return NULL;
1744
1745         new = (struct ctl_table *) (header + 1);
1746
1747         /* Now connect the dots */
1748         prevp = &header->ctl_table;
1749         for (n = 0; n < npath; ++n, ++path) {
1750                 /* Copy the procname */
1751                 new->procname = path->procname;
1752                 new->ctl_name = path->ctl_name;
1753                 new->mode     = 0555;
1754
1755                 *prevp = new;
1756                 prevp = &new->child;
1757
1758                 new += 2;
1759         }
1760         *prevp = table;
1761         header->ctl_table_arg = table;
1762
1763         INIT_LIST_HEAD(&header->ctl_entry);
1764         header->used = 0;
1765         header->unregistering = NULL;
1766         header->root = root;
1767         sysctl_set_parent(NULL, header->ctl_table);
1768 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1769         if (sysctl_check_table(namespaces, header->ctl_table)) {
1770                 kfree(header);
1771                 return NULL;
1772         }
1773 #endif
1774         spin_lock(&sysctl_lock);
1775         header_list = lookup_header_list(root, namespaces);
1776         list_add_tail(&header->ctl_entry, header_list);
1777         spin_unlock(&sysctl_lock);
1778
1779         return header;
1780 }
1781
1782 /**
1783  * register_sysctl_table_path - register a sysctl table hierarchy
1784  * @path: The path to the directory the sysctl table is in.
1785  * @table: the top-level table structure
1786  *
1787  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1788  * array. A completely 0 filled entry terminates the table.
1789  *
1790  * See __register_sysctl_paths for more details.
1791  */
1792 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1793                                                 struct ctl_table *table)
1794 {
1795         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1796                                         path, table);
1797 }
1798
1799 /**
1800  * register_sysctl_table - register a sysctl table hierarchy
1801  * @table: the top-level table structure
1802  *
1803  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1804  * array. A completely 0 filled entry terminates the table.
1805  *
1806  * See register_sysctl_paths for more details.
1807  */
1808 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1809 {
1810         static const struct ctl_path null_path[] = { {} };
1811
1812         return register_sysctl_paths(null_path, table);
1813 }
1814
1815 /**
1816  * unregister_sysctl_table - unregister a sysctl table hierarchy
1817  * @header: the header returned from register_sysctl_table
1818  *
1819  * Unregisters the sysctl table and all children. proc entries may not
1820  * actually be removed until they are no longer used by anyone.
1821  */
1822 void unregister_sysctl_table(struct ctl_table_header * header)
1823 {
1824         might_sleep();
1825
1826         if (header == NULL)
1827                 return;
1828
1829         spin_lock(&sysctl_lock);
1830         start_unregistering(header);
1831         spin_unlock(&sysctl_lock);
1832         kfree(header);
1833 }
1834
1835 #else /* !CONFIG_SYSCTL */
1836 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1837 {
1838         return NULL;
1839 }
1840
1841 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1842                                                     struct ctl_table *table)
1843 {
1844         return NULL;
1845 }
1846
1847 void unregister_sysctl_table(struct ctl_table_header * table)
1848 {
1849 }
1850
1851 #endif /* CONFIG_SYSCTL */
1852
1853 /*
1854  * /proc/sys support
1855  */
1856
1857 #ifdef CONFIG_PROC_SYSCTL
1858
1859 static int _proc_do_string(void* data, int maxlen, int write,
1860                            struct file *filp, void __user *buffer,
1861                            size_t *lenp, loff_t *ppos)
1862 {
1863         size_t len;
1864         char __user *p;
1865         char c;
1866
1867         if (!data || !maxlen || !*lenp) {
1868                 *lenp = 0;
1869                 return 0;
1870         }
1871
1872         if (write) {
1873                 len = 0;
1874                 p = buffer;
1875                 while (len < *lenp) {
1876                         if (get_user(c, p++))
1877                                 return -EFAULT;
1878                         if (c == 0 || c == '\n')
1879                                 break;
1880                         len++;
1881                 }
1882                 if (len >= maxlen)
1883                         len = maxlen-1;
1884                 if(copy_from_user(data, buffer, len))
1885                         return -EFAULT;
1886                 ((char *) data)[len] = 0;
1887                 *ppos += *lenp;
1888         } else {
1889                 len = strlen(data);
1890                 if (len > maxlen)
1891                         len = maxlen;
1892
1893                 if (*ppos > len) {
1894                         *lenp = 0;
1895                         return 0;
1896                 }
1897
1898                 data += *ppos;
1899                 len  -= *ppos;
1900
1901                 if (len > *lenp)
1902                         len = *lenp;
1903                 if (len)
1904                         if(copy_to_user(buffer, data, len))
1905                                 return -EFAULT;
1906                 if (len < *lenp) {
1907                         if(put_user('\n', ((char __user *) buffer) + len))
1908                                 return -EFAULT;
1909                         len++;
1910                 }
1911                 *lenp = len;
1912                 *ppos += len;
1913         }
1914         return 0;
1915 }
1916
1917 /**
1918  * proc_dostring - read a string sysctl
1919  * @table: the sysctl table
1920  * @write: %TRUE if this is a write to the sysctl file
1921  * @filp: the file structure
1922  * @buffer: the user buffer
1923  * @lenp: the size of the user buffer
1924  * @ppos: file position
1925  *
1926  * Reads/writes a string from/to the user buffer. If the kernel
1927  * buffer provided is not large enough to hold the string, the
1928  * string is truncated. The copied string is %NULL-terminated.
1929  * If the string is being read by the user process, it is copied
1930  * and a newline '\n' is added. It is truncated if the buffer is
1931  * not large enough.
1932  *
1933  * Returns 0 on success.
1934  */
1935 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1936                   void __user *buffer, size_t *lenp, loff_t *ppos)
1937 {
1938         return _proc_do_string(table->data, table->maxlen, write, filp,
1939                                buffer, lenp, ppos);
1940 }
1941
1942
1943 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1944                                  int *valp,
1945                                  int write, void *data)
1946 {
1947         if (write) {
1948                 *valp = *negp ? -*lvalp : *lvalp;
1949         } else {
1950                 int val = *valp;
1951                 if (val < 0) {
1952                         *negp = -1;
1953                         *lvalp = (unsigned long)-val;
1954                 } else {
1955                         *negp = 0;
1956                         *lvalp = (unsigned long)val;
1957                 }
1958         }
1959         return 0;
1960 }
1961
1962 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1963                   int write, struct file *filp, void __user *buffer,
1964                   size_t *lenp, loff_t *ppos,
1965                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1966                               int write, void *data),
1967                   void *data)
1968 {
1969 #define TMPBUFLEN 21
1970         int *i, vleft, first=1, neg, val;
1971         unsigned long lval;
1972         size_t left, len;
1973
1974         char buf[TMPBUFLEN], *p;
1975         char __user *s = buffer;
1976
1977         if (!tbl_data || !table->maxlen || !*lenp ||
1978             (*ppos && !write)) {
1979                 *lenp = 0;
1980                 return 0;
1981         }
1982
1983         i = (int *) tbl_data;
1984         vleft = table->maxlen / sizeof(*i);
1985         left = *lenp;
1986
1987         if (!conv)
1988                 conv = do_proc_dointvec_conv;
1989
1990         for (; left && vleft--; i++, first=0) {
1991                 if (write) {
1992                         while (left) {
1993                                 char c;
1994                                 if (get_user(c, s))
1995                                         return -EFAULT;
1996                                 if (!isspace(c))
1997                                         break;
1998                                 left--;
1999                                 s++;
2000                         }
2001                         if (!left)
2002                                 break;
2003                         neg = 0;
2004                         len = left;
2005                         if (len > sizeof(buf) - 1)
2006                                 len = sizeof(buf) - 1;
2007                         if (copy_from_user(buf, s, len))
2008                                 return -EFAULT;
2009                         buf[len] = 0;
2010                         p = buf;
2011                         if (*p == '-' && left > 1) {
2012                                 neg = 1;
2013                                 p++;
2014                         }
2015                         if (*p < '0' || *p > '9')
2016                                 break;
2017
2018                         lval = simple_strtoul(p, &p, 0);
2019
2020                         len = p-buf;
2021                         if ((len < left) && *p && !isspace(*p))
2022                                 break;
2023                         if (neg)
2024                                 val = -val;
2025                         s += len;
2026                         left -= len;
2027
2028                         if (conv(&neg, &lval, i, 1, data))
2029                                 break;
2030                 } else {
2031                         p = buf;
2032                         if (!first)
2033                                 *p++ = '\t';
2034
2035                         if (conv(&neg, &lval, i, 0, data))
2036                                 break;
2037
2038                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2039                         len = strlen(buf);
2040                         if (len > left)
2041                                 len = left;
2042                         if(copy_to_user(s, buf, len))
2043                                 return -EFAULT;
2044                         left -= len;
2045                         s += len;
2046                 }
2047         }
2048
2049         if (!write && !first && left) {
2050                 if(put_user('\n', s))
2051                         return -EFAULT;
2052                 left--, s++;
2053         }
2054         if (write) {
2055                 while (left) {
2056                         char c;
2057                         if (get_user(c, s++))
2058                                 return -EFAULT;
2059                         if (!isspace(c))
2060                                 break;
2061                         left--;
2062                 }
2063         }
2064         if (write && first)
2065                 return -EINVAL;
2066         *lenp -= left;
2067         *ppos += *lenp;
2068         return 0;
2069 #undef TMPBUFLEN
2070 }
2071
2072 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2073                   void __user *buffer, size_t *lenp, loff_t *ppos,
2074                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2075                               int write, void *data),
2076                   void *data)
2077 {
2078         return __do_proc_dointvec(table->data, table, write, filp,
2079                         buffer, lenp, ppos, conv, data);
2080 }
2081
2082 /**
2083  * proc_dointvec - read a vector of integers
2084  * @table: the sysctl table
2085  * @write: %TRUE if this is a write to the sysctl file
2086  * @filp: the file structure
2087  * @buffer: the user buffer
2088  * @lenp: the size of the user buffer
2089  * @ppos: file position
2090  *
2091  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2092  * values from/to the user buffer, treated as an ASCII string.
2093  *
2094  * Returns 0 on success.
2095  */
2096 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2097                      void __user *buffer, size_t *lenp, loff_t *ppos)
2098 {
2099     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2100                             NULL,NULL);
2101 }
2102
2103 #define OP_SET  0
2104 #define OP_AND  1
2105 #define OP_OR   2
2106
2107 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2108                                       int *valp,
2109                                       int write, void *data)
2110 {
2111         int op = *(int *)data;
2112         if (write) {
2113                 int val = *negp ? -*lvalp : *lvalp;
2114                 switch(op) {
2115                 case OP_SET:    *valp = val; break;
2116                 case OP_AND:    *valp &= val; break;
2117                 case OP_OR:     *valp |= val; break;
2118                 }
2119         } else {
2120                 int val = *valp;
2121                 if (val < 0) {
2122                         *negp = -1;
2123                         *lvalp = (unsigned long)-val;
2124                 } else {
2125                         *negp = 0;
2126                         *lvalp = (unsigned long)val;
2127                 }
2128         }
2129         return 0;
2130 }
2131
2132 /*
2133  *      Taint values can only be increased
2134  */
2135 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2136                                void __user *buffer, size_t *lenp, loff_t *ppos)
2137 {
2138         int op;
2139
2140         if (write && !capable(CAP_SYS_ADMIN))
2141                 return -EPERM;
2142
2143         op = OP_OR;
2144         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2145                                 do_proc_dointvec_bset_conv,&op);
2146 }
2147
2148 struct do_proc_dointvec_minmax_conv_param {
2149         int *min;
2150         int *max;
2151 };
2152
2153 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2154                                         int *valp,
2155                                         int write, void *data)
2156 {
2157         struct do_proc_dointvec_minmax_conv_param *param = data;
2158         if (write) {
2159                 int val = *negp ? -*lvalp : *lvalp;
2160                 if ((param->min && *param->min > val) ||
2161                     (param->max && *param->max < val))
2162                         return -EINVAL;
2163                 *valp = val;
2164         } else {
2165                 int val = *valp;
2166                 if (val < 0) {
2167                         *negp = -1;
2168                         *lvalp = (unsigned long)-val;
2169                 } else {
2170                         *negp = 0;
2171                         *lvalp = (unsigned long)val;
2172                 }
2173         }
2174         return 0;
2175 }
2176
2177 /**
2178  * proc_dointvec_minmax - read a vector of integers with min/max values
2179  * @table: the sysctl table
2180  * @write: %TRUE if this is a write to the sysctl file
2181  * @filp: the file structure
2182  * @buffer: the user buffer
2183  * @lenp: the size of the user buffer
2184  * @ppos: file position
2185  *
2186  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2187  * values from/to the user buffer, treated as an ASCII string.
2188  *
2189  * This routine will ensure the values are within the range specified by
2190  * table->extra1 (min) and table->extra2 (max).
2191  *
2192  * Returns 0 on success.
2193  */
2194 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2195                   void __user *buffer, size_t *lenp, loff_t *ppos)
2196 {
2197         struct do_proc_dointvec_minmax_conv_param param = {
2198                 .min = (int *) table->extra1,
2199                 .max = (int *) table->extra2,
2200         };
2201         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2202                                 do_proc_dointvec_minmax_conv, &param);
2203 }
2204
2205 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2206                                      struct file *filp,
2207                                      void __user *buffer,
2208                                      size_t *lenp, loff_t *ppos,
2209                                      unsigned long convmul,
2210                                      unsigned long convdiv)
2211 {
2212 #define TMPBUFLEN 21
2213         unsigned long *i, *min, *max, val;
2214         int vleft, first=1, neg;
2215         size_t len, left;
2216         char buf[TMPBUFLEN], *p;
2217         char __user *s = buffer;
2218
2219         if (!data || !table->maxlen || !*lenp ||
2220             (*ppos && !write)) {
2221                 *lenp = 0;
2222                 return 0;
2223         }
2224
2225         i = (unsigned long *) data;
2226         min = (unsigned long *) table->extra1;
2227         max = (unsigned long *) table->extra2;
2228         vleft = table->maxlen / sizeof(unsigned long);
2229         left = *lenp;
2230
2231         for (; left && vleft--; i++, min++, max++, first=0) {
2232                 if (write) {
2233                         while (left) {
2234                                 char c;
2235                                 if (get_user(c, s))
2236                                         return -EFAULT;
2237                                 if (!isspace(c))
2238                                         break;
2239                                 left--;
2240                                 s++;
2241                         }
2242                         if (!left)
2243                                 break;
2244                         neg = 0;
2245                         len = left;
2246                         if (len > TMPBUFLEN-1)
2247                                 len = TMPBUFLEN-1;
2248                         if (copy_from_user(buf, s, len))
2249                                 return -EFAULT;
2250                         buf[len] = 0;
2251                         p = buf;
2252                         if (*p == '-' && left > 1) {
2253                                 neg = 1;
2254                                 p++;
2255                         }
2256                         if (*p < '0' || *p > '9')
2257                                 break;
2258                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2259                         len = p-buf;
2260                         if ((len < left) && *p && !isspace(*p))
2261                                 break;
2262                         if (neg)
2263                                 val = -val;
2264                         s += len;
2265                         left -= len;
2266
2267                         if(neg)
2268                                 continue;
2269                         if ((min && val < *min) || (max && val > *max))
2270                                 continue;
2271                         *i = val;
2272                 } else {
2273                         p = buf;
2274                         if (!first)
2275                                 *p++ = '\t';
2276                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2277                         len = strlen(buf);
2278                         if (len > left)
2279                                 len = left;
2280                         if(copy_to_user(s, buf, len))
2281                                 return -EFAULT;
2282                         left -= len;
2283                         s += len;
2284                 }
2285         }
2286
2287         if (!write && !first && left) {
2288                 if(put_user('\n', s))
2289                         return -EFAULT;
2290                 left--, s++;
2291         }
2292         if (write) {
2293                 while (left) {
2294                         char c;
2295                         if (get_user(c, s++))
2296                                 return -EFAULT;
2297                         if (!isspace(c))
2298                                 break;
2299                         left--;
2300                 }
2301         }
2302         if (write && first)
2303                 return -EINVAL;
2304         *lenp -= left;
2305         *ppos += *lenp;
2306         return 0;
2307 #undef TMPBUFLEN
2308 }
2309
2310 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2311                                      struct file *filp,
2312                                      void __user *buffer,
2313                                      size_t *lenp, loff_t *ppos,
2314                                      unsigned long convmul,
2315                                      unsigned long convdiv)
2316 {
2317         return __do_proc_doulongvec_minmax(table->data, table, write,
2318                         filp, buffer, lenp, ppos, convmul, convdiv);
2319 }
2320
2321 /**
2322  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2323  * @table: the sysctl table
2324  * @write: %TRUE if this is a write to the sysctl file
2325  * @filp: the file structure
2326  * @buffer: the user buffer
2327  * @lenp: the size of the user buffer
2328  * @ppos: file position
2329  *
2330  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2331  * values from/to the user buffer, treated as an ASCII string.
2332  *
2333  * This routine will ensure the values are within the range specified by
2334  * table->extra1 (min) and table->extra2 (max).
2335  *
2336  * Returns 0 on success.
2337  */
2338 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2339                            void __user *buffer, size_t *lenp, loff_t *ppos)
2340 {
2341     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2342 }
2343
2344 /**
2345  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2346  * @table: the sysctl table
2347  * @write: %TRUE if this is a write to the sysctl file
2348  * @filp: the file structure
2349  * @buffer: the user buffer
2350  * @lenp: the size of the user buffer
2351  * @ppos: file position
2352  *
2353  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2354  * values from/to the user buffer, treated as an ASCII string. The values
2355  * are treated as milliseconds, and converted to jiffies when they are stored.
2356  *
2357  * This routine will ensure the values are within the range specified by
2358  * table->extra1 (min) and table->extra2 (max).
2359  *
2360  * Returns 0 on success.
2361  */
2362 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2363                                       struct file *filp,
2364                                       void __user *buffer,
2365                                       size_t *lenp, loff_t *ppos)
2366 {
2367     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2368                                      lenp, ppos, HZ, 1000l);
2369 }
2370
2371
2372 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2373                                          int *valp,
2374                                          int write, void *data)
2375 {
2376         if (write) {
2377                 if (*lvalp > LONG_MAX / HZ)
2378                         return 1;
2379                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2380         } else {
2381                 int val = *valp;
2382                 unsigned long lval;
2383                 if (val < 0) {
2384                         *negp = -1;
2385                         lval = (unsigned long)-val;
2386                 } else {
2387                         *negp = 0;
2388                         lval = (unsigned long)val;
2389                 }
2390                 *lvalp = lval / HZ;
2391         }
2392         return 0;
2393 }
2394
2395 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2396                                                 int *valp,
2397                                                 int write, void *data)
2398 {
2399         if (write) {
2400                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2401                         return 1;
2402                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2403         } else {
2404                 int val = *valp;
2405                 unsigned long lval;
2406                 if (val < 0) {
2407                         *negp = -1;
2408                         lval = (unsigned long)-val;
2409                 } else {
2410                         *negp = 0;
2411                         lval = (unsigned long)val;
2412                 }
2413                 *lvalp = jiffies_to_clock_t(lval);
2414         }
2415         return 0;
2416 }
2417
2418 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2419                                             int *valp,
2420                                             int write, void *data)
2421 {
2422         if (write) {
2423                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2424         } else {
2425                 int val = *valp;
2426                 unsigned long lval;
2427                 if (val < 0) {
2428                         *negp = -1;
2429                         lval = (unsigned long)-val;
2430                 } else {
2431                         *negp = 0;
2432                         lval = (unsigned long)val;
2433                 }
2434                 *lvalp = jiffies_to_msecs(lval);
2435         }
2436         return 0;
2437 }
2438
2439 /**
2440  * proc_dointvec_jiffies - read a vector of integers as seconds
2441  * @table: the sysctl table
2442  * @write: %TRUE if this is a write to the sysctl file
2443  * @filp: the file structure
2444  * @buffer: the user buffer
2445  * @lenp: the size of the user buffer
2446  * @ppos: file position
2447  *
2448  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2449  * values from/to the user buffer, treated as an ASCII string.
2450  * The values read are assumed to be in seconds, and are converted into
2451  * jiffies.
2452  *
2453  * Returns 0 on success.
2454  */
2455 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2456                           void __user *buffer, size_t *lenp, loff_t *ppos)
2457 {
2458     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2459                             do_proc_dointvec_jiffies_conv,NULL);
2460 }
2461
2462 /**
2463  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2464  * @table: the sysctl table
2465  * @write: %TRUE if this is a write to the sysctl file
2466  * @filp: the file structure
2467  * @buffer: the user buffer
2468  * @lenp: the size of the user buffer
2469  * @ppos: pointer to the file position
2470  *
2471  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2472  * values from/to the user buffer, treated as an ASCII string.
2473  * The values read are assumed to be in 1/USER_HZ seconds, and
2474  * are converted into jiffies.
2475  *
2476  * Returns 0 on success.
2477  */
2478 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2479                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2480 {
2481     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2482                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2483 }
2484
2485 /**
2486  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2487  * @table: the sysctl table
2488  * @write: %TRUE if this is a write to the sysctl file
2489  * @filp: the file structure
2490  * @buffer: the user buffer
2491  * @lenp: the size of the user buffer
2492  * @ppos: file position
2493  * @ppos: the current position in the file
2494  *
2495  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2496  * values from/to the user buffer, treated as an ASCII string.
2497  * The values read are assumed to be in 1/1000 seconds, and
2498  * are converted into jiffies.
2499  *
2500  * Returns 0 on success.
2501  */
2502 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2503                              void __user *buffer, size_t *lenp, loff_t *ppos)
2504 {
2505         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2506                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2507 }
2508
2509 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2510                            void __user *buffer, size_t *lenp, loff_t *ppos)
2511 {
2512         struct pid *new_pid;
2513         pid_t tmp;
2514         int r;
2515
2516         tmp = pid_vnr(cad_pid);
2517
2518         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2519                                lenp, ppos, NULL, NULL);
2520         if (r || !write)
2521                 return r;
2522
2523         new_pid = find_get_pid(tmp);
2524         if (!new_pid)
2525                 return -ESRCH;
2526
2527         put_pid(xchg(&cad_pid, new_pid));
2528         return 0;
2529 }
2530
2531 #else /* CONFIG_PROC_FS */
2532
2533 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2534                   void __user *buffer, size_t *lenp, loff_t *ppos)
2535 {
2536         return -ENOSYS;
2537 }
2538
2539 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2540                   void __user *buffer, size_t *lenp, loff_t *ppos)
2541 {
2542         return -ENOSYS;
2543 }
2544
2545 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2546                     void __user *buffer, size_t *lenp, loff_t *ppos)
2547 {
2548         return -ENOSYS;
2549 }
2550
2551 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2552                     void __user *buffer, size_t *lenp, loff_t *ppos)
2553 {
2554         return -ENOSYS;
2555 }
2556
2557 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2558                     void __user *buffer, size_t *lenp, loff_t *ppos)
2559 {
2560         return -ENOSYS;
2561 }
2562
2563 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2564                              void __user *buffer, size_t *lenp, loff_t *ppos)
2565 {
2566         return -ENOSYS;
2567 }
2568
2569 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2570                     void __user *buffer, size_t *lenp, loff_t *ppos)
2571 {
2572         return -ENOSYS;
2573 }
2574
2575 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2576                                       struct file *filp,
2577                                       void __user *buffer,
2578                                       size_t *lenp, loff_t *ppos)
2579 {
2580     return -ENOSYS;
2581 }
2582
2583
2584 #endif /* CONFIG_PROC_FS */
2585
2586
2587 #ifdef CONFIG_SYSCTL_SYSCALL
2588 /*
2589  * General sysctl support routines
2590  */
2591
2592 /* The generic sysctl data routine (used if no strategy routine supplied) */
2593 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2594                 void __user *oldval, size_t __user *oldlenp,
2595                 void __user *newval, size_t newlen)
2596 {
2597         size_t len;
2598
2599         /* Get out of I don't have a variable */
2600         if (!table->data || !table->maxlen)
2601                 return -ENOTDIR;
2602
2603         if (oldval && oldlenp) {
2604                 if (get_user(len, oldlenp))
2605                         return -EFAULT;
2606                 if (len) {
2607                         if (len > table->maxlen)
2608                                 len = table->maxlen;
2609                         if (copy_to_user(oldval, table->data, len))
2610                                 return -EFAULT;
2611                         if (put_user(len, oldlenp))
2612                                 return -EFAULT;
2613                 }
2614         }
2615
2616         if (newval && newlen) {
2617                 if (newlen > table->maxlen)
2618                         newlen = table->maxlen;
2619
2620                 if (copy_from_user(table->data, newval, newlen))
2621                         return -EFAULT;
2622         }
2623         return 1;
2624 }
2625
2626 /* The generic string strategy routine: */
2627 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2628                   void __user *oldval, size_t __user *oldlenp,
2629                   void __user *newval, size_t newlen)
2630 {
2631         if (!table->data || !table->maxlen)
2632                 return -ENOTDIR;
2633
2634         if (oldval && oldlenp) {
2635                 size_t bufsize;
2636                 if (get_user(bufsize, oldlenp))
2637                         return -EFAULT;
2638                 if (bufsize) {
2639                         size_t len = strlen(table->data), copied;
2640
2641                         /* This shouldn't trigger for a well-formed sysctl */
2642                         if (len > table->maxlen)
2643                                 len = table->maxlen;
2644
2645                         /* Copy up to a max of bufsize-1 bytes of the string */
2646                         copied = (len >= bufsize) ? bufsize - 1 : len;
2647
2648                         if (copy_to_user(oldval, table->data, copied) ||
2649                             put_user(0, (char __user *)(oldval + copied)))
2650                                 return -EFAULT;
2651                         if (put_user(len, oldlenp))
2652                                 return -EFAULT;
2653                 }
2654         }
2655         if (newval && newlen) {
2656                 size_t len = newlen;
2657                 if (len > table->maxlen)
2658                         len = table->maxlen;
2659                 if(copy_from_user(table->data, newval, len))
2660                         return -EFAULT;
2661                 if (len == table->maxlen)
2662                         len--;
2663                 ((char *) table->data)[len] = 0;
2664         }
2665         return 1;
2666 }
2667
2668 /*
2669  * This function makes sure that all of the integers in the vector
2670  * are between the minimum and maximum values given in the arrays
2671  * table->extra1 and table->extra2, respectively.
2672  */
2673 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2674                 void __user *oldval, size_t __user *oldlenp,
2675                 void __user *newval, size_t newlen)
2676 {
2677
2678         if (newval && newlen) {
2679                 int __user *vec = (int __user *) newval;
2680                 int *min = (int *) table->extra1;
2681                 int *max = (int *) table->extra2;
2682                 size_t length;
2683                 int i;
2684
2685                 if (newlen % sizeof(int) != 0)
2686                         return -EINVAL;
2687
2688                 if (!table->extra1 && !table->extra2)
2689                         return 0;
2690
2691                 if (newlen > table->maxlen)
2692                         newlen = table->maxlen;
2693                 length = newlen / sizeof(int);
2694
2695                 for (i = 0; i < length; i++) {
2696                         int value;
2697                         if (get_user(value, vec + i))
2698                                 return -EFAULT;
2699                         if (min && value < min[i])
2700                                 return -EINVAL;
2701                         if (max && value > max[i])
2702                                 return -EINVAL;
2703                 }
2704         }
2705         return 0;
2706 }
2707
2708 /* Strategy function to convert jiffies to seconds */
2709 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2710                 void __user *oldval, size_t __user *oldlenp,
2711                 void __user *newval, size_t newlen)
2712 {
2713         if (oldval && oldlenp) {
2714                 size_t olen;
2715
2716                 if (get_user(olen, oldlenp))
2717                         return -EFAULT;
2718                 if (olen) {
2719                         int val;
2720
2721                         if (olen < sizeof(int))
2722                                 return -EINVAL;
2723
2724                         val = *(int *)(table->data) / HZ;
2725                         if (put_user(val, (int __user *)oldval))
2726                                 return -EFAULT;
2727                         if (put_user(sizeof(int), oldlenp))
2728                                 return -EFAULT;
2729                 }
2730         }
2731         if (newval && newlen) {
2732                 int new;
2733                 if (newlen != sizeof(int))
2734                         return -EINVAL;
2735                 if (get_user(new, (int __user *)newval))
2736                         return -EFAULT;
2737                 *(int *)(table->data) = new*HZ;
2738         }
2739         return 1;
2740 }
2741
2742 /* Strategy function to convert jiffies to seconds */
2743 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2744                 void __user *oldval, size_t __user *oldlenp,
2745                 void __user *newval, size_t newlen)
2746 {
2747         if (oldval && oldlenp) {
2748                 size_t olen;
2749
2750                 if (get_user(olen, oldlenp))
2751                         return -EFAULT;
2752                 if (olen) {
2753                         int val;
2754
2755                         if (olen < sizeof(int))
2756                                 return -EINVAL;
2757
2758                         val = jiffies_to_msecs(*(int *)(table->data));
2759                         if (put_user(val, (int __user *)oldval))
2760                                 return -EFAULT;
2761                         if (put_user(sizeof(int), oldlenp))
2762                                 return -EFAULT;
2763                 }
2764         }
2765         if (newval && newlen) {
2766                 int new;
2767                 if (newlen != sizeof(int))
2768                         return -EINVAL;
2769                 if (get_user(new, (int __user *)newval))
2770                         return -EFAULT;
2771                 *(int *)(table->data) = msecs_to_jiffies(new);
2772         }
2773         return 1;
2774 }
2775
2776
2777
2778 #else /* CONFIG_SYSCTL_SYSCALL */
2779
2780
2781 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2782 {
2783         struct __sysctl_args tmp;
2784         int error;
2785
2786         if (copy_from_user(&tmp, args, sizeof(tmp)))
2787                 return -EFAULT;
2788
2789         error = deprecated_sysctl_warning(&tmp);
2790
2791         /* If no error reading the parameters then just -ENOSYS ... */
2792         if (!error)
2793                 error = -ENOSYS;
2794
2795         return error;
2796 }
2797
2798 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2799                   void __user *oldval, size_t __user *oldlenp,
2800                   void __user *newval, size_t newlen)
2801 {
2802         return -ENOSYS;
2803 }
2804
2805 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2806                   void __user *oldval, size_t __user *oldlenp,
2807                   void __user *newval, size_t newlen)
2808 {
2809         return -ENOSYS;
2810 }
2811
2812 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2813                 void __user *oldval, size_t __user *oldlenp,
2814                 void __user *newval, size_t newlen)
2815 {
2816         return -ENOSYS;
2817 }
2818
2819 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2820                 void __user *oldval, size_t __user *oldlenp,
2821                 void __user *newval, size_t newlen)
2822 {
2823         return -ENOSYS;
2824 }
2825
2826 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2827                 void __user *oldval, size_t __user *oldlenp,
2828                 void __user *newval, size_t newlen)
2829 {
2830         return -ENOSYS;
2831 }
2832
2833 #endif /* CONFIG_SYSCTL_SYSCALL */
2834
2835 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2836 {
2837         static int msg_count;
2838         int name[CTL_MAXNAME];
2839         int i;
2840
2841         /* Check args->nlen. */
2842         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2843                 return -ENOTDIR;
2844
2845         /* Read in the sysctl name for better debug message logging */
2846         for (i = 0; i < args->nlen; i++)
2847                 if (get_user(name[i], args->name + i))
2848                         return -EFAULT;
2849
2850         /* Ignore accesses to kernel.version */
2851         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2852                 return 0;
2853
2854         if (msg_count < 5) {
2855                 msg_count++;
2856                 printk(KERN_INFO
2857                         "warning: process `%s' used the deprecated sysctl "
2858                         "system call with ", current->comm);
2859                 for (i = 0; i < args->nlen; i++)
2860                         printk("%d.", name[i]);
2861                 printk("\n");
2862         }
2863         return 0;
2864 }
2865
2866 /*
2867  * No sense putting this after each symbol definition, twice,
2868  * exception granted :-)
2869  */
2870 EXPORT_SYMBOL(proc_dointvec);
2871 EXPORT_SYMBOL(proc_dointvec_jiffies);
2872 EXPORT_SYMBOL(proc_dointvec_minmax);
2873 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2874 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2875 EXPORT_SYMBOL(proc_dostring);
2876 EXPORT_SYMBOL(proc_doulongvec_minmax);
2877 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2878 EXPORT_SYMBOL(register_sysctl_table);
2879 EXPORT_SYMBOL(register_sysctl_paths);
2880 EXPORT_SYMBOL(sysctl_intvec);
2881 EXPORT_SYMBOL(sysctl_jiffies);
2882 EXPORT_SYMBOL(sysctl_ms_jiffies);
2883 EXPORT_SYMBOL(sysctl_string);
2884 EXPORT_SYMBOL(sysctl_data);
2885 EXPORT_SYMBOL(unregister_sysctl_table);