kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/security.h>
  41 #include <linux/initrd.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48 #include <linux/reboot.h>
  49
  50 #include <asm/uaccess.h>
  51 #include <asm/processor.h>
  52
  53 #ifdef CONFIG_X86
  54 #include <asm/nmi.h>
  55 #include <asm/stacktrace.h>
  56 #endif
  57
  58 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  59
  60 #if defined(CONFIG_SYSCTL)
  61
  62 /* External variables not in a header file. */
  63 extern int C_A_D;
  64 extern int print_fatal_signals;
  65 extern int sysctl_overcommit_memory;
  66 extern int sysctl_overcommit_ratio;
  67 extern int sysctl_panic_on_oom;
  68 extern int sysctl_oom_kill_allocating_task;
  69 extern int max_threads;
  70 extern int core_uses_pid;
  71 extern int suid_dumpable;
  72 extern char core_pattern[];
  73 extern int pid_max;
  74 extern int min_free_kbytes;
  75 extern int printk_ratelimit_jiffies;
  76 extern int printk_ratelimit_burst;
  77 extern int pid_max_min, pid_max_max;
  78 extern int sysctl_drop_caches;
  79 extern int percpu_pagelist_fraction;
  80 extern int compat_log;
  81 extern int maps_protect;
  82 extern int sysctl_stat_interval;
  83 extern int audit_argv_kb;
  84 extern int latencytop_enabled;
  85
  86 /* Constants used for minimum and  maximum */
  87 #ifdef CONFIG_DETECT_SOFTLOCKUP
  88 static int one = 1;
  89 static int sixty = 60;
  90 #endif
  91
  92 #ifdef CONFIG_MMU
  93 static int two = 2;
  94 #endif
  95
  96 static int zero;
  97 static int one_hundred = 100;
  98
  99 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 100 static int maxolduid = 65535;
 101 static int minolduid;
 102 static int min_percpu_pagelist_fract = 8;
 103
 104 static int ngroups_max = NGROUPS_MAX;
 105
 106 #ifdef CONFIG_KMOD
 107 extern char modprobe_path[];
 108 #endif
 109 #ifdef CONFIG_CHR_DEV_SG
 110 extern int sg_big_buff;
 111 #endif
 112
 113 #ifdef __sparc__
 114 extern char reboot_command [];
 115 extern int stop_a_enabled;
 116 extern int scons_pwroff;
 117 #endif
 118
 119 #ifdef __hppa__
 120 extern int pwrsw_enabled;
 121 extern int unaligned_enabled;
 122 #endif
 123
 124 #ifdef CONFIG_S390
 125 #ifdef CONFIG_MATHEMU
 126 extern int sysctl_ieee_emulation_warnings;
 127 #endif
 128 extern int sysctl_userprocess_debug;
 129 extern int spin_retry;
 130 #endif
 131
 132 extern int sysctl_hz_timer;
 133
 134 #ifdef CONFIG_BSD_PROCESS_ACCT
 135 extern int acct_parm[];
 136 #endif
 137
 138 #ifdef CONFIG_IA64
 139 extern int no_unaligned_warning;
 140 #endif
 141
 142 #ifdef CONFIG_RT_MUTEXES
 143 extern int max_lock_depth;
 144 #endif
 145
 146 #ifdef CONFIG_SYSCTL_SYSCALL
 147 static int parse_table(int __user *, int, void __user *, size_t __user *,
 148                 void __user *, size_t, struct ctl_table *);
 149 #endif
 150
 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 #ifdef CONFIG_NET
 204         {
 205                 .ctl_name       = CTL_NET,
 206                 .procname       = "net",
 207                 .mode           = 0555,
 208                 .child          = net_table,
 209         },
 210 #endif
 211         {
 212                 .ctl_name       = CTL_FS,
 213                 .procname       = "fs",
 214                 .mode           = 0555,
 215                 .child          = fs_table,
 216         },
 217         {
 218                 .ctl_name       = CTL_DEBUG,
 219                 .procname       = "debug",
 220                 .mode           = 0555,
 221                 .child          = debug_table,
 222         },
 223         {
 224                 .ctl_name       = CTL_DEV,
 225                 .procname       = "dev",
 226                 .mode           = 0555,
 227                 .child          = dev_table,
 228         },
 229 /*
 230  * NOTE: do not add new entries to this table unless you have read
 231  * Documentation/sysctl/ctl_unnumbered.txt
 232  */
 233         { .ctl_name = 0 }
 234 };
 235
 236 #ifdef CONFIG_SCHED_DEBUG
 237 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 238 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 239 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 240 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 241 #endif
 242
 243 static struct ctl_table kern_table[] = {
 244 #ifdef CONFIG_SCHED_DEBUG
 245         {
 246                 .ctl_name       = CTL_UNNUMBERED,
 247                 .procname       = "sched_min_granularity_ns",
 248                 .data           = &sysctl_sched_min_granularity,
 249                 .maxlen         = sizeof(unsigned int),
 250                 .mode           = 0644,
 251                 .proc_handler   = &sched_nr_latency_handler,
 252                 .strategy       = &sysctl_intvec,
 253                 .extra1         = &min_sched_granularity_ns,
 254                 .extra2         = &max_sched_granularity_ns,
 255         },
 256         {
 257                 .ctl_name       = CTL_UNNUMBERED,
 258                 .procname       = "sched_latency_ns",
 259                 .data           = &sysctl_sched_latency,
 260                 .maxlen         = sizeof(unsigned int),
 261                 .mode           = 0644,
 262                 .proc_handler   = &sched_nr_latency_handler,
 263                 .strategy       = &sysctl_intvec,
 264                 .extra1         = &min_sched_granularity_ns,
 265                 .extra2         = &max_sched_granularity_ns,
 266         },
 267         {
 268                 .ctl_name       = CTL_UNNUMBERED,
 269                 .procname       = "sched_wakeup_granularity_ns",
 270                 .data           = &sysctl_sched_wakeup_granularity,
 271                 .maxlen         = sizeof(unsigned int),
 272                 .mode           = 0644,
 273                 .proc_handler   = &proc_dointvec_minmax,
 274                 .strategy       = &sysctl_intvec,
 275                 .extra1         = &min_wakeup_granularity_ns,
 276                 .extra2         = &max_wakeup_granularity_ns,
 277         },
 278         {
 279                 .ctl_name       = CTL_UNNUMBERED,
 280                 .procname       = "sched_batch_wakeup_granularity_ns",
 281                 .data           = &sysctl_sched_batch_wakeup_granularity,
 282                 .maxlen         = sizeof(unsigned int),
 283                 .mode           = 0644,
 284                 .proc_handler   = &proc_dointvec_minmax,
 285                 .strategy       = &sysctl_intvec,
 286                 .extra1         = &min_wakeup_granularity_ns,
 287                 .extra2         = &max_wakeup_granularity_ns,
 288         },
 289         {
 290                 .ctl_name       = CTL_UNNUMBERED,
 291                 .procname       = "sched_child_runs_first",
 292                 .data           = &sysctl_sched_child_runs_first,
 293                 .maxlen         = sizeof(unsigned int),
 294                 .mode           = 0644,
 295                 .proc_handler   = &proc_dointvec,
 296         },
 297         {
 298                 .ctl_name       = CTL_UNNUMBERED,
 299                 .procname       = "sched_features",
 300                 .data           = &sysctl_sched_features,
 301                 .maxlen         = sizeof(unsigned int),
 302                 .mode           = 0644,
 303                 .proc_handler   = &proc_dointvec,
 304         },
 305         {
 306                 .ctl_name       = CTL_UNNUMBERED,
 307                 .procname       = "sched_migration_cost",
 308                 .data           = &sysctl_sched_migration_cost,
 309                 .maxlen         = sizeof(unsigned int),
 310                 .mode           = 0644,
 311                 .proc_handler   = &proc_dointvec,
 312         },
 313         {
 314                 .ctl_name       = CTL_UNNUMBERED,
 315                 .procname       = "sched_nr_migrate",
 316                 .data           = &sysctl_sched_nr_migrate,
 317                 .maxlen         = sizeof(unsigned int),
 318                 .mode           = 0644,
 319                 .proc_handler   = &proc_dointvec,
 320         },
 321         {
 322                 .ctl_name       = CTL_UNNUMBERED,
 323                 .procname       = "sched_rt_period_ms",
 324                 .data           = &sysctl_sched_rt_period,
 325                 .maxlen         = sizeof(unsigned int),
 326                 .mode           = 0644,
 327                 .proc_handler   = &proc_dointvec,
 328         },
 329         {
 330                 .ctl_name       = CTL_UNNUMBERED,
 331                 .procname       = "sched_rt_ratio",
 332                 .data           = &sysctl_sched_rt_ratio,
 333                 .maxlen         = sizeof(unsigned int),
 334                 .mode           = 0644,
 335                 .proc_handler   = &proc_dointvec,
 336         },
 337 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
 338         {
 339                 .ctl_name       = CTL_UNNUMBERED,
 340                 .procname       = "sched_min_bal_int_shares",
 341                 .data           = &sysctl_sched_min_bal_int_shares,
 342                 .maxlen         = sizeof(unsigned int),
 343                 .mode           = 0644,
 344                 .proc_handler   = &proc_dointvec,
 345         },
 346         {
 347                 .ctl_name       = CTL_UNNUMBERED,
 348                 .procname       = "sched_max_bal_int_shares",
 349                 .data           = &sysctl_sched_max_bal_int_shares,
 350                 .maxlen         = sizeof(unsigned int),
 351                 .mode           = 0644,
 352                 .proc_handler   = &proc_dointvec,
 353         },
 354 #endif
 355 #endif
 356         {
 357                 .ctl_name       = CTL_UNNUMBERED,
 358                 .procname       = "sched_compat_yield",
 359                 .data           = &sysctl_sched_compat_yield,
 360                 .maxlen         = sizeof(unsigned int),
 361                 .mode           = 0644,
 362                 .proc_handler   = &proc_dointvec,
 363         },
 364 #ifdef CONFIG_PROVE_LOCKING
 365         {
 366                 .ctl_name       = CTL_UNNUMBERED,
 367                 .procname       = "prove_locking",
 368                 .data           = &prove_locking,
 369                 .maxlen         = sizeof(int),
 370                 .mode           = 0644,
 371                 .proc_handler   = &proc_dointvec,
 372         },
 373 #endif
 374 #ifdef CONFIG_LOCK_STAT
 375         {
 376                 .ctl_name       = CTL_UNNUMBERED,
 377                 .procname       = "lock_stat",
 378                 .data           = &lock_stat,
 379                 .maxlen         = sizeof(int),
 380                 .mode           = 0644,
 381                 .proc_handler   = &proc_dointvec,
 382         },
 383 #endif
 384         {
 385                 .ctl_name       = KERN_PANIC,
 386                 .procname       = "panic",
 387                 .data           = &panic_timeout,
 388                 .maxlen         = sizeof(int),
 389                 .mode           = 0644,
 390                 .proc_handler   = &proc_dointvec,
 391         },
 392         {
 393                 .ctl_name       = KERN_CORE_USES_PID,
 394                 .procname       = "core_uses_pid",
 395                 .data           = &core_uses_pid,
 396                 .maxlen         = sizeof(int),
 397                 .mode           = 0644,
 398                 .proc_handler   = &proc_dointvec,
 399         },
 400 #ifdef CONFIG_AUDITSYSCALL
 401         {
 402                 .ctl_name       = CTL_UNNUMBERED,
 403                 .procname       = "audit_argv_kb",
 404                 .data           = &audit_argv_kb,
 405                 .maxlen         = sizeof(int),
 406                 .mode           = 0644,
 407                 .proc_handler   = &proc_dointvec,
 408         },
 409 #endif
 410         {
 411                 .ctl_name       = KERN_CORE_PATTERN,
 412                 .procname       = "core_pattern",
 413                 .data           = core_pattern,
 414                 .maxlen         = CORENAME_MAX_SIZE,
 415                 .mode           = 0644,
 416                 .proc_handler   = &proc_dostring,
 417                 .strategy       = &sysctl_string,
 418         },
 419 #ifdef CONFIG_PROC_SYSCTL
 420         {
 421                 .procname       = "tainted",
 422                 .data           = &tainted,
 423                 .maxlen         = sizeof(int),
 424                 .mode           = 0644,
 425                 .proc_handler   = &proc_dointvec_taint,
 426         },
 427 #endif
 428 #ifdef CONFIG_LATENCYTOP
 429         {
 430                 .procname       = "latencytop",
 431                 .data           = &latencytop_enabled,
 432                 .maxlen         = sizeof(int),
 433                 .mode           = 0644,
 434                 .proc_handler   = &proc_dointvec,
 435         },
 436 #endif
 437 #ifdef CONFIG_SECURITY_CAPABILITIES
 438         {
 439                 .procname       = "cap-bound",
 440                 .data           = &cap_bset,
 441                 .maxlen         = sizeof(kernel_cap_t),
 442                 .mode           = 0600,
 443                 .proc_handler   = &proc_dointvec_bset,
 444         },
 445 #endif /* def CONFIG_SECURITY_CAPABILITIES */
 446 #ifdef CONFIG_BLK_DEV_INITRD
 447         {
 448                 .ctl_name       = KERN_REALROOTDEV,
 449                 .procname       = "real-root-dev",
 450                 .data           = &real_root_dev,
 451                 .maxlen         = sizeof(int),
 452                 .mode           = 0644,
 453                 .proc_handler   = &proc_dointvec,
 454         },
 455 #endif
 456         {
 457                 .ctl_name       = CTL_UNNUMBERED,
 458                 .procname       = "print-fatal-signals",
 459                 .data           = &print_fatal_signals,
 460                 .maxlen         = sizeof(int),
 461                 .mode           = 0644,
 462                 .proc_handler   = &proc_dointvec,
 463         },
 464 #ifdef __sparc__
 465         {
 466                 .ctl_name       = KERN_SPARC_REBOOT,
 467                 .procname       = "reboot-cmd",
 468                 .data           = reboot_command,
 469                 .maxlen         = 256,
 470                 .mode           = 0644,
 471                 .proc_handler   = &proc_dostring,
 472                 .strategy       = &sysctl_string,
 473         },
 474         {
 475                 .ctl_name       = KERN_SPARC_STOP_A,
 476                 .procname       = "stop-a",
 477                 .data           = &stop_a_enabled,
 478                 .maxlen         = sizeof (int),
 479                 .mode           = 0644,
 480                 .proc_handler   = &proc_dointvec,
 481         },
 482         {
 483                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 484                 .procname       = "scons-poweroff",
 485                 .data           = &scons_pwroff,
 486                 .maxlen         = sizeof (int),
 487                 .mode           = 0644,
 488                 .proc_handler   = &proc_dointvec,
 489         },
 490 #endif
 491 #ifdef __hppa__
 492         {
 493                 .ctl_name       = KERN_HPPA_PWRSW,
 494                 .procname       = "soft-power",
 495                 .data           = &pwrsw_enabled,
 496                 .maxlen         = sizeof (int),
 497                 .mode           = 0644,
 498                 .proc_handler   = &proc_dointvec,
 499         },
 500         {
 501                 .ctl_name       = KERN_HPPA_UNALIGNED,
 502                 .procname       = "unaligned-trap",
 503                 .data           = &unaligned_enabled,
 504                 .maxlen         = sizeof (int),
 505                 .mode           = 0644,
 506                 .proc_handler   = &proc_dointvec,
 507         },
 508 #endif
 509         {
 510                 .ctl_name       = KERN_CTLALTDEL,
 511                 .procname       = "ctrl-alt-del",
 512                 .data           = &C_A_D,
 513                 .maxlen         = sizeof(int),
 514                 .mode           = 0644,
 515                 .proc_handler   = &proc_dointvec,
 516         },
 517         {
 518                 .ctl_name       = KERN_PRINTK,
 519                 .procname       = "printk",
 520                 .data           = &console_loglevel,
 521                 .maxlen         = 4*sizeof(int),
 522                 .mode           = 0644,
 523                 .proc_handler   = &proc_dointvec,
 524         },
 525 #ifdef CONFIG_KMOD
 526         {
 527                 .ctl_name       = KERN_MODPROBE,
 528                 .procname       = "modprobe",
 529                 .data           = &modprobe_path,
 530                 .maxlen         = KMOD_PATH_LEN,
 531                 .mode           = 0644,
 532                 .proc_handler   = &proc_dostring,
 533                 .strategy       = &sysctl_string,
 534         },
 535 #endif
 536 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 537         {
 538                 .ctl_name       = KERN_HOTPLUG,
 539                 .procname       = "hotplug",
 540                 .data           = &uevent_helper,
 541                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 542                 .mode           = 0644,
 543                 .proc_handler   = &proc_dostring,
 544                 .strategy       = &sysctl_string,
 545         },
 546 #endif
 547 #ifdef CONFIG_CHR_DEV_SG
 548         {
 549                 .ctl_name       = KERN_SG_BIG_BUFF,
 550                 .procname       = "sg-big-buff",
 551                 .data           = &sg_big_buff,
 552                 .maxlen         = sizeof (int),
 553                 .mode           = 0444,
 554                 .proc_handler   = &proc_dointvec,
 555         },
 556 #endif
 557 #ifdef CONFIG_BSD_PROCESS_ACCT
 558         {
 559                 .ctl_name       = KERN_ACCT,
 560                 .procname       = "acct",
 561                 .data           = &acct_parm,
 562                 .maxlen         = 3*sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = &proc_dointvec,
 565         },
 566 #endif
 567 #ifdef CONFIG_MAGIC_SYSRQ
 568         {
 569                 .ctl_name       = KERN_SYSRQ,
 570                 .procname       = "sysrq",
 571                 .data           = &__sysrq_enabled,
 572                 .maxlen         = sizeof (int),
 573                 .mode           = 0644,
 574                 .proc_handler   = &proc_dointvec,
 575         },
 576 #endif
 577 #ifdef CONFIG_PROC_SYSCTL
 578         {
 579                 .procname       = "cad_pid",
 580                 .data           = NULL,
 581                 .maxlen         = sizeof (int),
 582                 .mode           = 0600,
 583                 .proc_handler   = &proc_do_cad_pid,
 584         },
 585 #endif
 586         {
 587                 .ctl_name       = KERN_MAX_THREADS,
 588                 .procname       = "threads-max",
 589                 .data           = &max_threads,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = &proc_dointvec,
 593         },
 594         {
 595                 .ctl_name       = KERN_RANDOM,
 596                 .procname       = "random",
 597                 .mode           = 0555,
 598                 .child          = random_table,
 599         },
 600         {
 601                 .ctl_name       = KERN_OVERFLOWUID,
 602                 .procname       = "overflowuid",
 603                 .data           = &overflowuid,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec_minmax,
 607                 .strategy       = &sysctl_intvec,
 608                 .extra1         = &minolduid,
 609                 .extra2         = &maxolduid,
 610         },
 611         {
 612                 .ctl_name       = KERN_OVERFLOWGID,
 613                 .procname       = "overflowgid",
 614                 .data           = &overflowgid,
 615                 .maxlen         = sizeof(int),
 616                 .mode           = 0644,
 617                 .proc_handler   = &proc_dointvec_minmax,
 618                 .strategy       = &sysctl_intvec,
 619                 .extra1         = &minolduid,
 620                 .extra2         = &maxolduid,
 621         },
 622 #ifdef CONFIG_S390
 623 #ifdef CONFIG_MATHEMU
 624         {
 625                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 626                 .procname       = "ieee_emulation_warnings",
 627                 .data           = &sysctl_ieee_emulation_warnings,
 628                 .maxlen         = sizeof(int),
 629                 .mode           = 0644,
 630                 .proc_handler   = &proc_dointvec,
 631         },
 632 #endif
 633 #ifdef CONFIG_NO_IDLE_HZ
 634         {
 635                 .ctl_name       = KERN_HZ_TIMER,
 636                 .procname       = "hz_timer",
 637                 .data           = &sysctl_hz_timer,
 638                 .maxlen         = sizeof(int),
 639                 .mode           = 0644,
 640                 .proc_handler   = &proc_dointvec,
 641         },
 642 #endif
 643         {
 644                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 645                 .procname       = "userprocess_debug",
 646                 .data           = &sysctl_userprocess_debug,
 647                 .maxlen         = sizeof(int),
 648                 .mode           = 0644,
 649                 .proc_handler   = &proc_dointvec,
 650         },
 651 #endif
 652         {
 653                 .ctl_name       = KERN_PIDMAX,
 654                 .procname       = "pid_max",
 655                 .data           = &pid_max,
 656                 .maxlen         = sizeof (int),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_dointvec_minmax,
 659                 .strategy       = sysctl_intvec,
 660                 .extra1         = &pid_max_min,
 661                 .extra2         = &pid_max_max,
 662         },
 663         {
 664                 .ctl_name       = KERN_PANIC_ON_OOPS,
 665                 .procname       = "panic_on_oops",
 666                 .data           = &panic_on_oops,
 667                 .maxlen         = sizeof(int),
 668                 .mode           = 0644,
 669                 .proc_handler   = &proc_dointvec,
 670         },
 671         {
 672                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 673                 .procname       = "printk_ratelimit",
 674                 .data           = &printk_ratelimit_jiffies,
 675                 .maxlen         = sizeof(int),
 676                 .mode           = 0644,
 677                 .proc_handler   = &proc_dointvec_jiffies,
 678                 .strategy       = &sysctl_jiffies,
 679         },
 680         {
 681                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 682                 .procname       = "printk_ratelimit_burst",
 683                 .data           = &printk_ratelimit_burst,
 684                 .maxlen         = sizeof(int),
 685                 .mode           = 0644,
 686                 .proc_handler   = &proc_dointvec,
 687         },
 688         {
 689                 .ctl_name       = KERN_NGROUPS_MAX,
 690                 .procname       = "ngroups_max",
 691                 .data           = &ngroups_max,
 692                 .maxlen         = sizeof (int),
 693                 .mode           = 0444,
 694                 .proc_handler   = &proc_dointvec,
 695         },
 696 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 697         {
 698                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 699                 .procname       = "unknown_nmi_panic",
 700                 .data           = &unknown_nmi_panic,
 701                 .maxlen         = sizeof (int),
 702                 .mode           = 0644,
 703                 .proc_handler   = &proc_dointvec,
 704         },
 705         {
 706                 .procname       = "nmi_watchdog",
 707                 .data           = &nmi_watchdog_enabled,
 708                 .maxlen         = sizeof (int),
 709                 .mode           = 0644,
 710                 .proc_handler   = &proc_nmi_enabled,
 711         },
 712 #endif
 713 #if defined(CONFIG_X86)
 714         {
 715                 .ctl_name       = KERN_PANIC_ON_NMI,
 716                 .procname       = "panic_on_unrecovered_nmi",
 717                 .data           = &panic_on_unrecovered_nmi,
 718                 .maxlen         = sizeof(int),
 719                 .mode           = 0644,
 720                 .proc_handler   = &proc_dointvec,
 721         },
 722         {
 723                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 724                 .procname       = "bootloader_type",
 725                 .data           = &bootloader_type,
 726                 .maxlen         = sizeof (int),
 727                 .mode           = 0444,
 728                 .proc_handler   = &proc_dointvec,
 729         },
 730         {
 731                 .ctl_name       = CTL_UNNUMBERED,
 732                 .procname       = "kstack_depth_to_print",
 733                 .data           = &kstack_depth_to_print,
 734                 .maxlen         = sizeof(int),
 735                 .mode           = 0644,
 736                 .proc_handler   = &proc_dointvec,
 737         },
 738 #endif
 739 #if defined(CONFIG_MMU)
 740         {
 741                 .ctl_name       = KERN_RANDOMIZE,
 742                 .procname       = "randomize_va_space",
 743                 .data           = &randomize_va_space,
 744                 .maxlen         = sizeof(int),
 745                 .mode           = 0644,
 746                 .proc_handler   = &proc_dointvec,
 747         },
 748 #endif
 749 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 750         {
 751                 .ctl_name       = KERN_SPIN_RETRY,
 752                 .procname       = "spin_retry",
 753                 .data           = &spin_retry,
 754                 .maxlen         = sizeof (int),
 755                 .mode           = 0644,
 756                 .proc_handler   = &proc_dointvec,
 757         },
 758 #endif
 759 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 760         {
 761                 .procname       = "acpi_video_flags",
 762                 .data           = &acpi_realmode_flags,
 763                 .maxlen         = sizeof (unsigned long),
 764                 .mode           = 0644,
 765                 .proc_handler   = &proc_doulongvec_minmax,
 766         },
 767 #endif
 768 #ifdef CONFIG_IA64
 769         {
 770                 .ctl_name       = KERN_IA64_UNALIGNED,
 771                 .procname       = "ignore-unaligned-usertrap",
 772                 .data           = &no_unaligned_warning,
 773                 .maxlen         = sizeof (int),
 774                 .mode           = 0644,
 775                 .proc_handler   = &proc_dointvec,
 776         },
 777 #endif
 778 #ifdef CONFIG_DETECT_SOFTLOCKUP
 779         {
 780                 .ctl_name       = CTL_UNNUMBERED,
 781                 .procname       = "softlockup_thresh",
 782                 .data           = &softlockup_thresh,
 783                 .maxlen         = sizeof(unsigned long),
 784                 .mode           = 0644,
 785                 .proc_handler   = &proc_doulongvec_minmax,
 786                 .strategy       = &sysctl_intvec,
 787                 .extra1         = &one,
 788                 .extra2         = &sixty,
 789         },
 790         {
 791                 .ctl_name       = CTL_UNNUMBERED,
 792                 .procname       = "hung_task_check_count",
 793                 .data           = &sysctl_hung_task_check_count,
 794                 .maxlen         = sizeof(unsigned long),
 795                 .mode           = 0644,
 796                 .proc_handler   = &proc_doulongvec_minmax,
 797                 .strategy       = &sysctl_intvec,
 798         },
 799         {
 800                 .ctl_name       = CTL_UNNUMBERED,
 801                 .procname       = "hung_task_timeout_secs",
 802                 .data           = &sysctl_hung_task_timeout_secs,
 803                 .maxlen         = sizeof(unsigned long),
 804                 .mode           = 0644,
 805                 .proc_handler   = &proc_doulongvec_minmax,
 806                 .strategy       = &sysctl_intvec,
 807         },
 808         {
 809                 .ctl_name       = CTL_UNNUMBERED,
 810                 .procname       = "hung_task_warnings",
 811                 .data           = &sysctl_hung_task_warnings,
 812                 .maxlen         = sizeof(unsigned long),
 813                 .mode           = 0644,
 814                 .proc_handler   = &proc_doulongvec_minmax,
 815                 .strategy       = &sysctl_intvec,
 816         },
 817 #endif
 818 #ifdef CONFIG_COMPAT
 819         {
 820                 .ctl_name       = KERN_COMPAT_LOG,
 821                 .procname       = "compat-log",
 822                 .data           = &compat_log,
 823                 .maxlen         = sizeof (int),
 824                 .mode           = 0644,
 825                 .proc_handler   = &proc_dointvec,
 826         },
 827 #endif
 828 #ifdef CONFIG_RT_MUTEXES
 829         {
 830                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 831                 .procname       = "max_lock_depth",
 832                 .data           = &max_lock_depth,
 833                 .maxlen         = sizeof(int),
 834                 .mode           = 0644,
 835                 .proc_handler   = &proc_dointvec,
 836         },
 837 #endif
 838 #ifdef CONFIG_PROC_FS
 839         {
 840                 .ctl_name       = CTL_UNNUMBERED,
 841                 .procname       = "maps_protect",
 842                 .data           = &maps_protect,
 843                 .maxlen         = sizeof(int),
 844                 .mode           = 0644,
 845                 .proc_handler   = &proc_dointvec,
 846         },
 847 #endif
 848         {
 849                 .ctl_name       = CTL_UNNUMBERED,
 850                 .procname       = "poweroff_cmd",
 851                 .data           = &poweroff_cmd,
 852                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 853                 .mode           = 0644,
 854                 .proc_handler   = &proc_dostring,
 855                 .strategy       = &sysctl_string,
 856         },
 857 /*
 858  * NOTE: do not add new entries to this table unless you have read
 859  * Documentation/sysctl/ctl_unnumbered.txt
 860  */
 861         { .ctl_name = 0 }
 862 };
 863
 864 static struct ctl_table vm_table[] = {
 865         {
 866                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 867                 .procname       = "overcommit_memory",
 868                 .data           = &sysctl_overcommit_memory,
 869                 .maxlen         = sizeof(sysctl_overcommit_memory),
 870                 .mode           = 0644,
 871                 .proc_handler   = &proc_dointvec,
 872         },
 873         {
 874                 .ctl_name       = VM_PANIC_ON_OOM,
 875                 .procname       = "panic_on_oom",
 876                 .data           = &sysctl_panic_on_oom,
 877                 .maxlen         = sizeof(sysctl_panic_on_oom),
 878                 .mode           = 0644,
 879                 .proc_handler   = &proc_dointvec,
 880         },
 881         {
 882                 .ctl_name       = CTL_UNNUMBERED,
 883                 .procname       = "oom_kill_allocating_task",
 884                 .data           = &sysctl_oom_kill_allocating_task,
 885                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 886                 .mode           = 0644,
 887                 .proc_handler   = &proc_dointvec,
 888         },
 889         {
 890                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 891                 .procname       = "overcommit_ratio",
 892                 .data           = &sysctl_overcommit_ratio,
 893                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 894                 .mode           = 0644,
 895                 .proc_handler   = &proc_dointvec,
 896         },
 897         {
 898                 .ctl_name       = VM_PAGE_CLUSTER,
 899                 .procname       = "page-cluster",
 900                 .data           = &page_cluster,
 901                 .maxlen         = sizeof(int),
 902                 .mode           = 0644,
 903                 .proc_handler   = &proc_dointvec,
 904         },
 905         {
 906                 .ctl_name       = VM_DIRTY_BACKGROUND,
 907                 .procname       = "dirty_background_ratio",
 908                 .data           = &dirty_background_ratio,
 909                 .maxlen         = sizeof(dirty_background_ratio),
 910                 .mode           = 0644,
 911                 .proc_handler   = &proc_dointvec_minmax,
 912                 .strategy       = &sysctl_intvec,
 913                 .extra1         = &zero,
 914                 .extra2         = &one_hundred,
 915         },
 916         {
 917                 .ctl_name       = VM_DIRTY_RATIO,
 918                 .procname       = "dirty_ratio",
 919                 .data           = &vm_dirty_ratio,
 920                 .maxlen         = sizeof(vm_dirty_ratio),
 921                 .mode           = 0644,
 922                 .proc_handler   = &dirty_ratio_handler,
 923                 .strategy       = &sysctl_intvec,
 924                 .extra1         = &zero,
 925                 .extra2         = &one_hundred,
 926         },
 927         {
 928                 .procname       = "dirty_writeback_centisecs",
 929                 .data           = &dirty_writeback_interval,
 930                 .maxlen         = sizeof(dirty_writeback_interval),
 931                 .mode           = 0644,
 932                 .proc_handler   = &dirty_writeback_centisecs_handler,
 933         },
 934         {
 935                 .procname       = "dirty_expire_centisecs",
 936                 .data           = &dirty_expire_interval,
 937                 .maxlen         = sizeof(dirty_expire_interval),
 938                 .mode           = 0644,
 939                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 940         },
 941         {
 942                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 943                 .procname       = "nr_pdflush_threads",
 944                 .data           = &nr_pdflush_threads,
 945                 .maxlen         = sizeof nr_pdflush_threads,
 946                 .mode           = 0444 /* read-only*/,
 947                 .proc_handler   = &proc_dointvec,
 948         },
 949         {
 950                 .ctl_name       = VM_SWAPPINESS,
 951                 .procname       = "swappiness",
 952                 .data           = &vm_swappiness,
 953                 .maxlen         = sizeof(vm_swappiness),
 954                 .mode           = 0644,
 955                 .proc_handler   = &proc_dointvec_minmax,
 956                 .strategy       = &sysctl_intvec,
 957                 .extra1         = &zero,
 958                 .extra2         = &one_hundred,
 959         },
 960 #ifdef CONFIG_HUGETLB_PAGE
 961          {
 962                 .procname       = "nr_hugepages",
 963                 .data           = &max_huge_pages,
 964                 .maxlen         = sizeof(unsigned long),
 965                 .mode           = 0644,
 966                 .proc_handler   = &hugetlb_sysctl_handler,
 967                 .extra1         = (void *)&hugetlb_zero,
 968                 .extra2         = (void *)&hugetlb_infinity,
 969          },
 970          {
 971                 .ctl_name       = VM_HUGETLB_GROUP,
 972                 .procname       = "hugetlb_shm_group",
 973                 .data           = &sysctl_hugetlb_shm_group,
 974                 .maxlen         = sizeof(gid_t),
 975                 .mode           = 0644,
 976                 .proc_handler   = &proc_dointvec,
 977          },
 978          {
 979                 .ctl_name       = CTL_UNNUMBERED,
 980                 .procname       = "hugepages_treat_as_movable",
 981                 .data           = &hugepages_treat_as_movable,
 982                 .maxlen         = sizeof(int),
 983                 .mode           = 0644,
 984                 .proc_handler   = &hugetlb_treat_movable_handler,
 985         },
 986         {
 987                 .ctl_name       = CTL_UNNUMBERED,
 988                 .procname       = "nr_overcommit_hugepages",
 989                 .data           = &nr_overcommit_huge_pages,
 990                 .maxlen         = sizeof(nr_overcommit_huge_pages),
 991                 .mode           = 0644,
 992                 .proc_handler   = &proc_doulongvec_minmax,
 993         },
 994 #endif
 995         {
 996                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 997                 .procname       = "lowmem_reserve_ratio",
 998                 .data           = &sysctl_lowmem_reserve_ratio,
 999                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1000                 .mode           = 0644,
1001                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1002                 .strategy       = &sysctl_intvec,
1003         },
1004         {
1005                 .ctl_name       = VM_DROP_PAGECACHE,
1006                 .procname       = "drop_caches",
1007                 .data           = &sysctl_drop_caches,
1008                 .maxlen         = sizeof(int),
1009                 .mode           = 0644,
1010                 .proc_handler   = drop_caches_sysctl_handler,
1011                 .strategy       = &sysctl_intvec,
1012         },
1013         {
1014                 .ctl_name       = VM_MIN_FREE_KBYTES,
1015                 .procname       = "min_free_kbytes",
1016                 .data           = &min_free_kbytes,
1017                 .maxlen         = sizeof(min_free_kbytes),
1018                 .mode           = 0644,
1019                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1020                 .strategy       = &sysctl_intvec,
1021                 .extra1         = &zero,
1022         },
1023         {
1024                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1025                 .procname       = "percpu_pagelist_fraction",
1026                 .data           = &percpu_pagelist_fraction,
1027                 .maxlen         = sizeof(percpu_pagelist_fraction),
1028                 .mode           = 0644,
1029                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1030                 .strategy       = &sysctl_intvec,
1031                 .extra1         = &min_percpu_pagelist_fract,
1032         },
1033 #ifdef CONFIG_MMU
1034         {
1035                 .ctl_name       = VM_MAX_MAP_COUNT,
1036                 .procname       = "max_map_count",
1037                 .data           = &sysctl_max_map_count,
1038                 .maxlen         = sizeof(sysctl_max_map_count),
1039                 .mode           = 0644,
1040                 .proc_handler   = &proc_dointvec
1041         },
1042 #endif
1043         {
1044                 .ctl_name       = VM_LAPTOP_MODE,
1045                 .procname       = "laptop_mode",
1046                 .data           = &laptop_mode,
1047                 .maxlen         = sizeof(laptop_mode),
1048                 .mode           = 0644,
1049                 .proc_handler   = &proc_dointvec_jiffies,
1050                 .strategy       = &sysctl_jiffies,
1051         },
1052         {
1053                 .ctl_name       = VM_BLOCK_DUMP,
1054                 .procname       = "block_dump",
1055                 .data           = &block_dump,
1056                 .maxlen         = sizeof(block_dump),
1057                 .mode           = 0644,
1058                 .proc_handler   = &proc_dointvec,
1059                 .strategy       = &sysctl_intvec,
1060                 .extra1         = &zero,
1061         },
1062         {
1063                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1064                 .procname       = "vfs_cache_pressure",
1065                 .data           = &sysctl_vfs_cache_pressure,
1066                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1067                 .mode           = 0644,
1068                 .proc_handler   = &proc_dointvec,
1069                 .strategy       = &sysctl_intvec,
1070                 .extra1         = &zero,
1071         },
1072 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1073         {
1074                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1075                 .procname       = "legacy_va_layout",
1076                 .data           = &sysctl_legacy_va_layout,
1077                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1078                 .mode           = 0644,
1079                 .proc_handler   = &proc_dointvec,
1080                 .strategy       = &sysctl_intvec,
1081                 .extra1         = &zero,
1082         },
1083 #endif
1084 #ifdef CONFIG_NUMA
1085         {
1086                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1087                 .procname       = "zone_reclaim_mode",
1088                 .data           = &zone_reclaim_mode,
1089                 .maxlen         = sizeof(zone_reclaim_mode),
1090                 .mode           = 0644,
1091                 .proc_handler   = &proc_dointvec,
1092                 .strategy       = &sysctl_intvec,
1093                 .extra1         = &zero,
1094         },
1095         {
1096                 .ctl_name       = VM_MIN_UNMAPPED,
1097                 .procname       = "min_unmapped_ratio",
1098                 .data           = &sysctl_min_unmapped_ratio,
1099                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1100                 .mode           = 0644,
1101                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1102                 .strategy       = &sysctl_intvec,
1103                 .extra1         = &zero,
1104                 .extra2         = &one_hundred,
1105         },
1106         {
1107                 .ctl_name       = VM_MIN_SLAB,
1108                 .procname       = "min_slab_ratio",
1109                 .data           = &sysctl_min_slab_ratio,
1110                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1111                 .mode           = 0644,
1112                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1113                 .strategy       = &sysctl_intvec,
1114                 .extra1         = &zero,
1115                 .extra2         = &one_hundred,
1116         },
1117 #endif
1118 #ifdef CONFIG_SMP
1119         {
1120                 .ctl_name       = CTL_UNNUMBERED,
1121                 .procname       = "stat_interval",
1122                 .data           = &sysctl_stat_interval,
1123                 .maxlen         = sizeof(sysctl_stat_interval),
1124                 .mode           = 0644,
1125                 .proc_handler   = &proc_dointvec_jiffies,
1126                 .strategy       = &sysctl_jiffies,
1127         },
1128 #endif
1129 #ifdef CONFIG_SECURITY
1130         {
1131                 .ctl_name       = CTL_UNNUMBERED,
1132                 .procname       = "mmap_min_addr",
1133                 .data           = &mmap_min_addr,
1134                 .maxlen         = sizeof(unsigned long),
1135                 .mode           = 0644,
1136                 .proc_handler   = &proc_doulongvec_minmax,
1137         },
1138 #endif
1139 #ifdef CONFIG_NUMA
1140         {
1141                 .ctl_name       = CTL_UNNUMBERED,
1142                 .procname       = "numa_zonelist_order",
1143                 .data           = &numa_zonelist_order,
1144                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1145                 .mode           = 0644,
1146                 .proc_handler   = &numa_zonelist_order_handler,
1147                 .strategy       = &sysctl_string,
1148         },
1149 #endif
1150 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1151    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1152         {
1153                 .ctl_name       = VM_VDSO_ENABLED,
1154                 .procname       = "vdso_enabled",
1155                 .data           = &vdso_enabled,
1156                 .maxlen         = sizeof(vdso_enabled),
1157                 .mode           = 0644,
1158                 .proc_handler   = &proc_dointvec,
1159                 .strategy       = &sysctl_intvec,
1160                 .extra1         = &zero,
1161         },
1162 #endif
1163 /*
1164  * NOTE: do not add new entries to this table unless you have read
1165  * Documentation/sysctl/ctl_unnumbered.txt
1166  */
1167         { .ctl_name = 0 }
1168 };
1169
1170 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1171 static struct ctl_table binfmt_misc_table[] = {
1172         { .ctl_name = 0 }
1173 };
1174 #endif
1175
1176 static struct ctl_table fs_table[] = {
1177         {
1178                 .ctl_name       = FS_NRINODE,
1179                 .procname       = "inode-nr",
1180                 .data           = &inodes_stat,
1181                 .maxlen         = 2*sizeof(int),
1182                 .mode           = 0444,
1183                 .proc_handler   = &proc_dointvec,
1184         },
1185         {
1186                 .ctl_name       = FS_STATINODE,
1187                 .procname       = "inode-state",
1188                 .data           = &inodes_stat,
1189                 .maxlen         = 7*sizeof(int),
1190                 .mode           = 0444,
1191                 .proc_handler   = &proc_dointvec,
1192         },
1193         {
1194                 .procname       = "file-nr",
1195                 .data           = &files_stat,
1196                 .maxlen         = 3*sizeof(int),
1197                 .mode           = 0444,
1198                 .proc_handler   = &proc_nr_files,
1199         },
1200         {
1201                 .ctl_name       = FS_MAXFILE,
1202                 .procname       = "file-max",
1203                 .data           = &files_stat.max_files,
1204                 .maxlen         = sizeof(int),
1205                 .mode           = 0644,
1206                 .proc_handler   = &proc_dointvec,
1207         },
1208         {
1209                 .ctl_name       = FS_DENTRY,
1210                 .procname       = "dentry-state",
1211                 .data           = &dentry_stat,
1212                 .maxlen         = 6*sizeof(int),
1213                 .mode           = 0444,
1214                 .proc_handler   = &proc_dointvec,
1215         },
1216         {
1217                 .ctl_name       = FS_OVERFLOWUID,
1218                 .procname       = "overflowuid",
1219                 .data           = &fs_overflowuid,
1220                 .maxlen         = sizeof(int),
1221                 .mode           = 0644,
1222                 .proc_handler   = &proc_dointvec_minmax,
1223                 .strategy       = &sysctl_intvec,
1224                 .extra1         = &minolduid,
1225                 .extra2         = &maxolduid,
1226         },
1227         {
1228                 .ctl_name       = FS_OVERFLOWGID,
1229                 .procname       = "overflowgid",
1230                 .data           = &fs_overflowgid,
1231                 .maxlen         = sizeof(int),
1232                 .mode           = 0644,
1233                 .proc_handler   = &proc_dointvec_minmax,
1234                 .strategy       = &sysctl_intvec,
1235                 .extra1         = &minolduid,
1236                 .extra2         = &maxolduid,
1237         },
1238         {
1239                 .ctl_name       = FS_LEASES,
1240                 .procname       = "leases-enable",
1241                 .data           = &leases_enable,
1242                 .maxlen         = sizeof(int),
1243                 .mode           = 0644,
1244                 .proc_handler   = &proc_dointvec,
1245         },
1246 #ifdef CONFIG_DNOTIFY
1247         {
1248                 .ctl_name       = FS_DIR_NOTIFY,
1249                 .procname       = "dir-notify-enable",
1250                 .data           = &dir_notify_enable,
1251                 .maxlen         = sizeof(int),
1252                 .mode           = 0644,
1253                 .proc_handler   = &proc_dointvec,
1254         },
1255 #endif
1256 #ifdef CONFIG_MMU
1257         {
1258                 .ctl_name       = FS_LEASE_TIME,
1259                 .procname       = "lease-break-time",
1260                 .data           = &lease_break_time,
1261                 .maxlen         = sizeof(int),
1262                 .mode           = 0644,
1263                 .proc_handler   = &proc_dointvec_minmax,
1264                 .strategy       = &sysctl_intvec,
1265                 .extra1         = &zero,
1266                 .extra2         = &two,
1267         },
1268         {
1269                 .procname       = "aio-nr",
1270                 .data           = &aio_nr,
1271                 .maxlen         = sizeof(aio_nr),
1272                 .mode           = 0444,
1273                 .proc_handler   = &proc_doulongvec_minmax,
1274         },
1275         {
1276                 .procname       = "aio-max-nr",
1277                 .data           = &aio_max_nr,
1278                 .maxlen         = sizeof(aio_max_nr),
1279                 .mode           = 0644,
1280                 .proc_handler   = &proc_doulongvec_minmax,
1281         },
1282 #ifdef CONFIG_INOTIFY_USER
1283         {
1284                 .ctl_name       = FS_INOTIFY,
1285                 .procname       = "inotify",
1286                 .mode           = 0555,
1287                 .child          = inotify_table,
1288         },
1289 #endif
1290 #endif
1291         {
1292                 .ctl_name       = KERN_SETUID_DUMPABLE,
1293                 .procname       = "suid_dumpable",
1294                 .data           = &suid_dumpable,
1295                 .maxlen         = sizeof(int),
1296                 .mode           = 0644,
1297                 .proc_handler   = &proc_dointvec,
1298         },
1299 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1300         {
1301                 .ctl_name       = CTL_UNNUMBERED,
1302                 .procname       = "binfmt_misc",
1303                 .mode           = 0555,
1304                 .child          = binfmt_misc_table,
1305         },
1306 #endif
1307 /*
1308  * NOTE: do not add new entries to this table unless you have read
1309  * Documentation/sysctl/ctl_unnumbered.txt
1310  */
1311         { .ctl_name = 0 }
1312 };
1313
1314 static struct ctl_table debug_table[] = {
1315 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1316         {
1317                 .ctl_name       = CTL_UNNUMBERED,
1318                 .procname       = "exception-trace",
1319                 .data           = &show_unhandled_signals,
1320                 .maxlen         = sizeof(int),
1321                 .mode           = 0644,
1322                 .proc_handler   = proc_dointvec
1323         },
1324 #endif
1325         { .ctl_name = 0 }
1326 };
1327
1328 static struct ctl_table dev_table[] = {
1329         { .ctl_name = 0 }
1330 };
1331
1332 static DEFINE_SPINLOCK(sysctl_lock);
1333
1334 /* called under sysctl_lock */
1335 static int use_table(struct ctl_table_header *p)
1336 {
1337         if (unlikely(p->unregistering))
1338                 return 0;
1339         p->used++;
1340         return 1;
1341 }
1342
1343 /* called under sysctl_lock */
1344 static void unuse_table(struct ctl_table_header *p)
1345 {
1346         if (!--p->used)
1347                 if (unlikely(p->unregistering))
1348                         complete(p->unregistering);
1349 }
1350
1351 /* called under sysctl_lock, will reacquire if has to wait */
1352 static void start_unregistering(struct ctl_table_header *p)
1353 {
1354         /*
1355          * if p->used is 0, nobody will ever touch that entry again;
1356          * we'll eliminate all paths to it before dropping sysctl_lock
1357          */
1358         if (unlikely(p->used)) {
1359                 struct completion wait;
1360                 init_completion(&wait);
1361                 p->unregistering = &wait;
1362                 spin_unlock(&sysctl_lock);
1363                 wait_for_completion(&wait);
1364                 spin_lock(&sysctl_lock);
1365         }
1366         /*
1367          * do not remove from the list until nobody holds it; walking the
1368          * list in do_sysctl() relies on that.
1369          */
1370         list_del_init(&p->ctl_entry);
1371 }
1372
1373 void sysctl_head_finish(struct ctl_table_header *head)
1374 {
1375         if (!head)
1376                 return;
1377         spin_lock(&sysctl_lock);
1378         unuse_table(head);
1379         spin_unlock(&sysctl_lock);
1380 }
1381
1382 static struct list_head *
1383 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1384 {
1385         struct list_head *header_list;
1386         header_list = &root->header_list;
1387         if (root->lookup)
1388                 header_list = root->lookup(root, namespaces);
1389         return header_list;
1390 }
1391
1392 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1393                                             struct ctl_table_header *prev)
1394 {
1395         struct ctl_table_root *root;
1396         struct list_head *header_list;
1397         struct ctl_table_header *head;
1398         struct list_head *tmp;
1399
1400         spin_lock(&sysctl_lock);
1401         if (prev) {
1402                 head = prev;
1403                 tmp = &prev->ctl_entry;
1404                 unuse_table(prev);
1405                 goto next;
1406         }
1407         tmp = &root_table_header.ctl_entry;
1408         for (;;) {
1409                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1410
1411                 if (!use_table(head))
1412                         goto next;
1413                 spin_unlock(&sysctl_lock);
1414                 return head;
1415         next:
1416                 root = head->root;
1417                 tmp = tmp->next;
1418                 header_list = lookup_header_list(root, namespaces);
1419                 if (tmp != header_list)
1420                         continue;
1421
1422                 do {
1423                         root = list_entry(root->root_list.next,
1424                                         struct ctl_table_root, root_list);
1425                         if (root == &sysctl_table_root)
1426                                 goto out;
1427                         header_list = lookup_header_list(root, namespaces);
1428                 } while (list_empty(header_list));
1429                 tmp = header_list->next;
1430         }
1431 out:
1432         spin_unlock(&sysctl_lock);
1433         return NULL;
1434 }
1435
1436 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1437 {
1438         return __sysctl_head_next(current->nsproxy, prev);
1439 }
1440
1441 void register_sysctl_root(struct ctl_table_root *root)
1442 {
1443         spin_lock(&sysctl_lock);
1444         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1445         spin_unlock(&sysctl_lock);
1446 }
1447
1448 #ifdef CONFIG_SYSCTL_SYSCALL
1449 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1450                void __user *newval, size_t newlen)
1451 {
1452         struct ctl_table_header *head;
1453         int error = -ENOTDIR;
1454
1455         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1456                 return -ENOTDIR;
1457         if (oldval) {
1458                 int old_len;
1459                 if (!oldlenp || get_user(old_len, oldlenp))
1460                         return -EFAULT;
1461         }
1462
1463         for (head = sysctl_head_next(NULL); head;
1464                         head = sysctl_head_next(head)) {
1465                 error = parse_table(name, nlen, oldval, oldlenp,
1466                                         newval, newlen, head->ctl_table);
1467                 if (error != -ENOTDIR) {
1468                         sysctl_head_finish(head);
1469                         break;
1470                 }
1471         }
1472         return error;
1473 }
1474
1475 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1476 {
1477         struct __sysctl_args tmp;
1478         int error;
1479
1480         if (copy_from_user(&tmp, args, sizeof(tmp)))
1481                 return -EFAULT;
1482
1483         error = deprecated_sysctl_warning(&tmp);
1484         if (error)
1485                 goto out;
1486
1487         lock_kernel();
1488         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1489                           tmp.newval, tmp.newlen);
1490         unlock_kernel();
1491 out:
1492         return error;
1493 }
1494 #endif /* CONFIG_SYSCTL_SYSCALL */
1495
1496 /*
1497  * sysctl_perm does NOT grant the superuser all rights automatically, because
1498  * some sysctl variables are readonly even to root.
1499  */
1500
1501 static int test_perm(int mode, int op)
1502 {
1503         if (!current->euid)
1504                 mode >>= 6;
1505         else if (in_egroup_p(0))
1506                 mode >>= 3;
1507         if ((mode & op & 0007) == op)
1508                 return 0;
1509         return -EACCES;
1510 }
1511
1512 int sysctl_perm(struct ctl_table *table, int op)
1513 {
1514         int error;
1515         error = security_sysctl(table, op);
1516         if (error)
1517                 return error;
1518         return test_perm(table->mode, op);
1519 }
1520
1521 #ifdef CONFIG_SYSCTL_SYSCALL
1522 static int parse_table(int __user *name, int nlen,
1523                        void __user *oldval, size_t __user *oldlenp,
1524                        void __user *newval, size_t newlen,
1525                        struct ctl_table *table)
1526 {
1527         int n;
1528 repeat:
1529         if (!nlen)
1530                 return -ENOTDIR;
1531         if (get_user(n, name))
1532                 return -EFAULT;
1533         for ( ; table->ctl_name || table->procname; table++) {
1534                 if (!table->ctl_name)
1535                         continue;
1536                 if (n == table->ctl_name) {
1537                         int error;
1538                         if (table->child) {
1539                                 if (sysctl_perm(table, 001))
1540                                         return -EPERM;
1541                                 name++;
1542                                 nlen--;
1543                                 table = table->child;
1544                                 goto repeat;
1545                         }
1546                         error = do_sysctl_strategy(table, name, nlen,
1547                                                    oldval, oldlenp,
1548                                                    newval, newlen);
1549                         return error;
1550                 }
1551         }
1552         return -ENOTDIR;
1553 }
1554
1555 /* Perform the actual read/write of a sysctl table entry. */
1556 int do_sysctl_strategy (struct ctl_table *table,
1557                         int __user *name, int nlen,
1558                         void __user *oldval, size_t __user *oldlenp,
1559                         void __user *newval, size_t newlen)
1560 {
1561         int op = 0, rc;
1562
1563         if (oldval)
1564                 op |= 004;
1565         if (newval)
1566                 op |= 002;
1567         if (sysctl_perm(table, op))
1568                 return -EPERM;
1569
1570         if (table->strategy) {
1571                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1572                                      newval, newlen);
1573                 if (rc < 0)
1574                         return rc;
1575                 if (rc > 0)
1576                         return 0;
1577         }
1578
1579         /* If there is no strategy routine, or if the strategy returns
1580          * zero, proceed with automatic r/w */
1581         if (table->data && table->maxlen) {
1582                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1583                                  newval, newlen);
1584                 if (rc < 0)
1585                         return rc;
1586         }
1587         return 0;
1588 }
1589 #endif /* CONFIG_SYSCTL_SYSCALL */
1590
1591 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1592 {
1593         for (; table->ctl_name || table->procname; table++) {
1594                 table->parent = parent;
1595                 if (table->child)
1596                         sysctl_set_parent(table, table->child);
1597         }
1598 }
1599
1600 static __init int sysctl_init(void)
1601 {
1602         int err;
1603         sysctl_set_parent(NULL, root_table);
1604         err = sysctl_check_table(current->nsproxy, root_table);
1605         return 0;
1606 }
1607
1608 core_initcall(sysctl_init);
1609
1610 /**
1611  * __register_sysctl_paths - register a sysctl hierarchy
1612  * @root: List of sysctl headers to register on
1613  * @namespaces: Data to compute which lists of sysctl entries are visible
1614  * @path: The path to the directory the sysctl table is in.
1615  * @table: the top-level table structure
1616  *
1617  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1618  * array. A completely 0 filled entry terminates the table.
1619  *
1620  * The members of the &struct ctl_table structure are used as follows:
1621  *
1622  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1623  *            must be unique within that level of sysctl
1624  *
1625  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1626  *            enter a sysctl file
1627  *
1628  * data - a pointer to data for use by proc_handler
1629  *
1630  * maxlen - the maximum size in bytes of the data
1631  *
1632  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1633  *
1634  * child - a pointer to the child sysctl table if this entry is a directory, or
1635  *         %NULL.
1636  *
1637  * proc_handler - the text handler routine (described below)
1638  *
1639  * strategy - the strategy routine (described below)
1640  *
1641  * de - for internal use by the sysctl routines
1642  *
1643  * extra1, extra2 - extra pointers usable by the proc handler routines
1644  *
1645  * Leaf nodes in the sysctl tree will be represented by a single file
1646  * under /proc; non-leaf nodes will be represented by directories.
1647  *
1648  * sysctl(2) can automatically manage read and write requests through
1649  * the sysctl table.  The data and maxlen fields of the ctl_table
1650  * struct enable minimal validation of the values being written to be
1651  * performed, and the mode field allows minimal authentication.
1652  *
1653  * More sophisticated management can be enabled by the provision of a
1654  * strategy routine with the table entry.  This will be called before
1655  * any automatic read or write of the data is performed.
1656  *
1657  * The strategy routine may return
1658  *
1659  * < 0 - Error occurred (error is passed to user process)
1660  *
1661  * 0   - OK - proceed with automatic read or write.
1662  *
1663  * > 0 - OK - read or write has been done by the strategy routine, so
1664  *       return immediately.
1665  *
1666  * There must be a proc_handler routine for any terminal nodes
1667  * mirrored under /proc/sys (non-terminals are handled by a built-in
1668  * directory handler).  Several default handlers are available to
1669  * cover common cases -
1670  *
1671  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1672  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1673  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1674  *
1675  * It is the handler's job to read the input buffer from user memory
1676  * and process it. The handler should return 0 on success.
1677  *
1678  * This routine returns %NULL on a failure to register, and a pointer
1679  * to the table header on success.
1680  */
1681 struct ctl_table_header *__register_sysctl_paths(
1682         struct ctl_table_root *root,
1683         struct nsproxy *namespaces,
1684         const struct ctl_path *path, struct ctl_table *table)
1685 {
1686         struct list_head *header_list;
1687         struct ctl_table_header *header;
1688         struct ctl_table *new, **prevp;
1689         unsigned int n, npath;
1690
1691         /* Count the path components */
1692         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1693                 ;
1694
1695         /*
1696          * For each path component, allocate a 2-element ctl_table array.
1697          * The first array element will be filled with the sysctl entry
1698          * for this, the second will be the sentinel (ctl_name == 0).
1699          *
1700          * We allocate everything in one go so that we don't have to
1701          * worry about freeing additional memory in unregister_sysctl_table.
1702          */
1703         header = kzalloc(sizeof(struct ctl_table_header) +
1704                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1705         if (!header)
1706                 return NULL;
1707
1708         new = (struct ctl_table *) (header + 1);
1709
1710         /* Now connect the dots */
1711         prevp = &header->ctl_table;
1712         for (n = 0; n < npath; ++n, ++path) {
1713                 /* Copy the procname */
1714                 new->procname = path->procname;
1715                 new->ctl_name = path->ctl_name;
1716                 new->mode     = 0555;
1717
1718                 *prevp = new;
1719                 prevp = &new->child;
1720
1721                 new += 2;
1722         }
1723         *prevp = table;
1724         header->ctl_table_arg = table;
1725
1726         INIT_LIST_HEAD(&header->ctl_entry);
1727         header->used = 0;
1728         header->unregistering = NULL;
1729         header->root = root;
1730         sysctl_set_parent(NULL, header->ctl_table);
1731         if (sysctl_check_table(namespaces, header->ctl_table)) {
1732                 kfree(header);
1733                 return NULL;
1734         }
1735         spin_lock(&sysctl_lock);
1736         header_list = lookup_header_list(root, namespaces);
1737         list_add_tail(&header->ctl_entry, header_list);
1738         spin_unlock(&sysctl_lock);
1739
1740         return header;
1741 }
1742
1743 /**
1744  * register_sysctl_table_path - register a sysctl table hierarchy
1745  * @path: The path to the directory the sysctl table is in.
1746  * @table: the top-level table structure
1747  *
1748  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1749  * array. A completely 0 filled entry terminates the table.
1750  *
1751  * See __register_sysctl_paths for more details.
1752  */
1753 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1754                                                 struct ctl_table *table)
1755 {
1756         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1757                                         path, table);
1758 }
1759
1760 /**
1761  * register_sysctl_table - register a sysctl table hierarchy
1762  * @table: the top-level table structure
1763  *
1764  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1765  * array. A completely 0 filled entry terminates the table.
1766  *
1767  * See register_sysctl_paths for more details.
1768  */
1769 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1770 {
1771         static const struct ctl_path null_path[] = { {} };
1772
1773         return register_sysctl_paths(null_path, table);
1774 }
1775
1776 /**
1777  * unregister_sysctl_table - unregister a sysctl table hierarchy
1778  * @header: the header returned from register_sysctl_table
1779  *
1780  * Unregisters the sysctl table and all children. proc entries may not
1781  * actually be removed until they are no longer used by anyone.
1782  */
1783 void unregister_sysctl_table(struct ctl_table_header * header)
1784 {
1785         might_sleep();
1786
1787         if (header == NULL)
1788                 return;
1789
1790         spin_lock(&sysctl_lock);
1791         start_unregistering(header);
1792         spin_unlock(&sysctl_lock);
1793         kfree(header);
1794 }
1795
1796 #else /* !CONFIG_SYSCTL */
1797 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1798 {
1799         return NULL;
1800 }
1801
1802 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1803                                                     struct ctl_table *table)
1804 {
1805         return NULL;
1806 }
1807
1808 void unregister_sysctl_table(struct ctl_table_header * table)
1809 {
1810 }
1811
1812 #endif /* CONFIG_SYSCTL */
1813
1814 /*
1815  * /proc/sys support
1816  */
1817
1818 #ifdef CONFIG_PROC_SYSCTL
1819
1820 static int _proc_do_string(void* data, int maxlen, int write,
1821                            struct file *filp, void __user *buffer,
1822                            size_t *lenp, loff_t *ppos)
1823 {
1824         size_t len;
1825         char __user *p;
1826         char c;
1827
1828         if (!data || !maxlen || !*lenp) {
1829                 *lenp = 0;
1830                 return 0;
1831         }
1832
1833         if (write) {
1834                 len = 0;
1835                 p = buffer;
1836                 while (len < *lenp) {
1837                         if (get_user(c, p++))
1838                                 return -EFAULT;
1839                         if (c == 0 || c == '\n')
1840                                 break;
1841                         len++;
1842                 }
1843                 if (len >= maxlen)
1844                         len = maxlen-1;
1845                 if(copy_from_user(data, buffer, len))
1846                         return -EFAULT;
1847                 ((char *) data)[len] = 0;
1848                 *ppos += *lenp;
1849         } else {
1850                 len = strlen(data);
1851                 if (len > maxlen)
1852                         len = maxlen;
1853
1854                 if (*ppos > len) {
1855                         *lenp = 0;
1856                         return 0;
1857                 }
1858
1859                 data += *ppos;
1860                 len  -= *ppos;
1861
1862                 if (len > *lenp)
1863                         len = *lenp;
1864                 if (len)
1865                         if(copy_to_user(buffer, data, len))
1866                                 return -EFAULT;
1867                 if (len < *lenp) {
1868                         if(put_user('\n', ((char __user *) buffer) + len))
1869                                 return -EFAULT;
1870                         len++;
1871                 }
1872                 *lenp = len;
1873                 *ppos += len;
1874         }
1875         return 0;
1876 }
1877
1878 /**
1879  * proc_dostring - read a string sysctl
1880  * @table: the sysctl table
1881  * @write: %TRUE if this is a write to the sysctl file
1882  * @filp: the file structure
1883  * @buffer: the user buffer
1884  * @lenp: the size of the user buffer
1885  * @ppos: file position
1886  *
1887  * Reads/writes a string from/to the user buffer. If the kernel
1888  * buffer provided is not large enough to hold the string, the
1889  * string is truncated. The copied string is %NULL-terminated.
1890  * If the string is being read by the user process, it is copied
1891  * and a newline '\n' is added. It is truncated if the buffer is
1892  * not large enough.
1893  *
1894  * Returns 0 on success.
1895  */
1896 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1897                   void __user *buffer, size_t *lenp, loff_t *ppos)
1898 {
1899         return _proc_do_string(table->data, table->maxlen, write, filp,
1900                                buffer, lenp, ppos);
1901 }
1902
1903
1904 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1905                                  int *valp,
1906                                  int write, void *data)
1907 {
1908         if (write) {
1909                 *valp = *negp ? -*lvalp : *lvalp;
1910         } else {
1911                 int val = *valp;
1912                 if (val < 0) {
1913                         *negp = -1;
1914                         *lvalp = (unsigned long)-val;
1915                 } else {
1916                         *negp = 0;
1917                         *lvalp = (unsigned long)val;
1918                 }
1919         }
1920         return 0;
1921 }
1922
1923 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1924                   int write, struct file *filp, void __user *buffer,
1925                   size_t *lenp, loff_t *ppos,
1926                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1927                               int write, void *data),
1928                   void *data)
1929 {
1930 #define TMPBUFLEN 21
1931         int *i, vleft, first=1, neg, val;
1932         unsigned long lval;
1933         size_t left, len;
1934
1935         char buf[TMPBUFLEN], *p;
1936         char __user *s = buffer;
1937
1938         if (!tbl_data || !table->maxlen || !*lenp ||
1939             (*ppos && !write)) {
1940                 *lenp = 0;
1941                 return 0;
1942         }
1943
1944         i = (int *) tbl_data;
1945         vleft = table->maxlen / sizeof(*i);
1946         left = *lenp;
1947
1948         if (!conv)
1949                 conv = do_proc_dointvec_conv;
1950
1951         for (; left && vleft--; i++, first=0) {
1952                 if (write) {
1953                         while (left) {
1954                                 char c;
1955                                 if (get_user(c, s))
1956                                         return -EFAULT;
1957                                 if (!isspace(c))
1958                                         break;
1959                                 left--;
1960                                 s++;
1961                         }
1962                         if (!left)
1963                                 break;
1964                         neg = 0;
1965                         len = left;
1966                         if (len > sizeof(buf) - 1)
1967                                 len = sizeof(buf) - 1;
1968                         if (copy_from_user(buf, s, len))
1969                                 return -EFAULT;
1970                         buf[len] = 0;
1971                         p = buf;
1972                         if (*p == '-' && left > 1) {
1973                                 neg = 1;
1974                                 p++;
1975                         }
1976                         if (*p < '0' || *p > '9')
1977                                 break;
1978
1979                         lval = simple_strtoul(p, &p, 0);
1980
1981                         len = p-buf;
1982                         if ((len < left) && *p && !isspace(*p))
1983                                 break;
1984                         if (neg)
1985                                 val = -val;
1986                         s += len;
1987                         left -= len;
1988
1989                         if (conv(&neg, &lval, i, 1, data))
1990                                 break;
1991                 } else {
1992                         p = buf;
1993                         if (!first)
1994                                 *p++ = '\t';
1995
1996                         if (conv(&neg, &lval, i, 0, data))
1997                                 break;
1998
1999                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2000                         len = strlen(buf);
2001                         if (len > left)
2002                                 len = left;
2003                         if(copy_to_user(s, buf, len))
2004                                 return -EFAULT;
2005                         left -= len;
2006                         s += len;
2007                 }
2008         }
2009
2010         if (!write && !first && left) {
2011                 if(put_user('\n', s))
2012                         return -EFAULT;
2013                 left--, s++;
2014         }
2015         if (write) {
2016                 while (left) {
2017                         char c;
2018                         if (get_user(c, s++))
2019                                 return -EFAULT;
2020                         if (!isspace(c))
2021                                 break;
2022                         left--;
2023                 }
2024         }
2025         if (write && first)
2026                 return -EINVAL;
2027         *lenp -= left;
2028         *ppos += *lenp;
2029         return 0;
2030 #undef TMPBUFLEN
2031 }
2032
2033 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2034                   void __user *buffer, size_t *lenp, loff_t *ppos,
2035                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2036                               int write, void *data),
2037                   void *data)
2038 {
2039         return __do_proc_dointvec(table->data, table, write, filp,
2040                         buffer, lenp, ppos, conv, data);
2041 }
2042
2043 /**
2044  * proc_dointvec - read a vector of integers
2045  * @table: the sysctl table
2046  * @write: %TRUE if this is a write to the sysctl file
2047  * @filp: the file structure
2048  * @buffer: the user buffer
2049  * @lenp: the size of the user buffer
2050  * @ppos: file position
2051  *
2052  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2053  * values from/to the user buffer, treated as an ASCII string.
2054  *
2055  * Returns 0 on success.
2056  */
2057 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2058                      void __user *buffer, size_t *lenp, loff_t *ppos)
2059 {
2060     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2061                             NULL,NULL);
2062 }
2063
2064 #define OP_SET  0
2065 #define OP_AND  1
2066 #define OP_OR   2
2067
2068 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2069                                       int *valp,
2070                                       int write, void *data)
2071 {
2072         int op = *(int *)data;
2073         if (write) {
2074                 int val = *negp ? -*lvalp : *lvalp;
2075                 switch(op) {
2076                 case OP_SET:    *valp = val; break;
2077                 case OP_AND:    *valp &= val; break;
2078                 case OP_OR:     *valp |= val; break;
2079                 }
2080         } else {
2081                 int val = *valp;
2082                 if (val < 0) {
2083                         *negp = -1;
2084                         *lvalp = (unsigned long)-val;
2085                 } else {
2086                         *negp = 0;
2087                         *lvalp = (unsigned long)val;
2088                 }
2089         }
2090         return 0;
2091 }
2092
2093 #ifdef CONFIG_SECURITY_CAPABILITIES
2094 /*
2095  *      init may raise the set.
2096  */
2097
2098 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2099                         void __user *buffer, size_t *lenp, loff_t *ppos)
2100 {
2101         int op;
2102
2103         if (write && !capable(CAP_SYS_MODULE)) {
2104                 return -EPERM;
2105         }
2106
2107         op = is_global_init(current) ? OP_SET : OP_AND;
2108         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2109                                 do_proc_dointvec_bset_conv,&op);
2110 }
2111 #endif /* def CONFIG_SECURITY_CAPABILITIES */
2112
2113 /*
2114  *      Taint values can only be increased
2115  */
2116 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2117                                void __user *buffer, size_t *lenp, loff_t *ppos)
2118 {
2119         int op;
2120
2121         if (write && !capable(CAP_SYS_ADMIN))
2122                 return -EPERM;
2123
2124         op = OP_OR;
2125         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2126                                 do_proc_dointvec_bset_conv,&op);
2127 }
2128
2129 struct do_proc_dointvec_minmax_conv_param {
2130         int *min;
2131         int *max;
2132 };
2133
2134 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2135                                         int *valp,
2136                                         int write, void *data)
2137 {
2138         struct do_proc_dointvec_minmax_conv_param *param = data;
2139         if (write) {
2140                 int val = *negp ? -*lvalp : *lvalp;
2141                 if ((param->min && *param->min > val) ||
2142                     (param->max && *param->max < val))
2143                         return -EINVAL;
2144                 *valp = val;
2145         } else {
2146                 int val = *valp;
2147                 if (val < 0) {
2148                         *negp = -1;
2149                         *lvalp = (unsigned long)-val;
2150                 } else {
2151                         *negp = 0;
2152                         *lvalp = (unsigned long)val;
2153                 }
2154         }
2155         return 0;
2156 }
2157
2158 /**
2159  * proc_dointvec_minmax - read a vector of integers with min/max values
2160  * @table: the sysctl table
2161  * @write: %TRUE if this is a write to the sysctl file
2162  * @filp: the file structure
2163  * @buffer: the user buffer
2164  * @lenp: the size of the user buffer
2165  * @ppos: file position
2166  *
2167  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2168  * values from/to the user buffer, treated as an ASCII string.
2169  *
2170  * This routine will ensure the values are within the range specified by
2171  * table->extra1 (min) and table->extra2 (max).
2172  *
2173  * Returns 0 on success.
2174  */
2175 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2176                   void __user *buffer, size_t *lenp, loff_t *ppos)
2177 {
2178         struct do_proc_dointvec_minmax_conv_param param = {
2179                 .min = (int *) table->extra1,
2180                 .max = (int *) table->extra2,
2181         };
2182         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2183                                 do_proc_dointvec_minmax_conv, &param);
2184 }
2185
2186 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2187                                      struct file *filp,
2188                                      void __user *buffer,
2189                                      size_t *lenp, loff_t *ppos,
2190                                      unsigned long convmul,
2191                                      unsigned long convdiv)
2192 {
2193 #define TMPBUFLEN 21
2194         unsigned long *i, *min, *max, val;
2195         int vleft, first=1, neg;
2196         size_t len, left;
2197         char buf[TMPBUFLEN], *p;
2198         char __user *s = buffer;
2199
2200         if (!data || !table->maxlen || !*lenp ||
2201             (*ppos && !write)) {
2202                 *lenp = 0;
2203                 return 0;
2204         }
2205
2206         i = (unsigned long *) data;
2207         min = (unsigned long *) table->extra1;
2208         max = (unsigned long *) table->extra2;
2209         vleft = table->maxlen / sizeof(unsigned long);
2210         left = *lenp;
2211
2212         for (; left && vleft--; i++, min++, max++, first=0) {
2213                 if (write) {
2214                         while (left) {
2215                                 char c;
2216                                 if (get_user(c, s))
2217                                         return -EFAULT;
2218                                 if (!isspace(c))
2219                                         break;
2220                                 left--;
2221                                 s++;
2222                         }
2223                         if (!left)
2224                                 break;
2225                         neg = 0;
2226                         len = left;
2227                         if (len > TMPBUFLEN-1)
2228                                 len = TMPBUFLEN-1;
2229                         if (copy_from_user(buf, s, len))
2230                                 return -EFAULT;
2231                         buf[len] = 0;
2232                         p = buf;
2233                         if (*p == '-' && left > 1) {
2234                                 neg = 1;
2235                                 p++;
2236                         }
2237                         if (*p < '0' || *p > '9')
2238                                 break;
2239                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2240                         len = p-buf;
2241                         if ((len < left) && *p && !isspace(*p))
2242                                 break;
2243                         if (neg)
2244                                 val = -val;
2245                         s += len;
2246                         left -= len;
2247
2248                         if(neg)
2249                                 continue;
2250                         if ((min && val < *min) || (max && val > *max))
2251                                 continue;
2252                         *i = val;
2253                 } else {
2254                         p = buf;
2255                         if (!first)
2256                                 *p++ = '\t';
2257                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2258                         len = strlen(buf);
2259                         if (len > left)
2260                                 len = left;
2261                         if(copy_to_user(s, buf, len))
2262                                 return -EFAULT;
2263                         left -= len;
2264                         s += len;
2265                 }
2266         }
2267
2268         if (!write && !first && left) {
2269                 if(put_user('\n', s))
2270                         return -EFAULT;
2271                 left--, s++;
2272         }
2273         if (write) {
2274                 while (left) {
2275                         char c;
2276                         if (get_user(c, s++))
2277                                 return -EFAULT;
2278                         if (!isspace(c))
2279                                 break;
2280                         left--;
2281                 }
2282         }
2283         if (write && first)
2284                 return -EINVAL;
2285         *lenp -= left;
2286         *ppos += *lenp;
2287         return 0;
2288 #undef TMPBUFLEN
2289 }
2290
2291 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2292                                      struct file *filp,
2293                                      void __user *buffer,
2294                                      size_t *lenp, loff_t *ppos,
2295                                      unsigned long convmul,
2296                                      unsigned long convdiv)
2297 {
2298         return __do_proc_doulongvec_minmax(table->data, table, write,
2299                         filp, buffer, lenp, ppos, convmul, convdiv);
2300 }
2301
2302 /**
2303  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2304  * @table: the sysctl table
2305  * @write: %TRUE if this is a write to the sysctl file
2306  * @filp: the file structure
2307  * @buffer: the user buffer
2308  * @lenp: the size of the user buffer
2309  * @ppos: file position
2310  *
2311  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2312  * values from/to the user buffer, treated as an ASCII string.
2313  *
2314  * This routine will ensure the values are within the range specified by
2315  * table->extra1 (min) and table->extra2 (max).
2316  *
2317  * Returns 0 on success.
2318  */
2319 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2320                            void __user *buffer, size_t *lenp, loff_t *ppos)
2321 {
2322     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2323 }
2324
2325 /**
2326  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2327  * @table: the sysctl table
2328  * @write: %TRUE if this is a write to the sysctl file
2329  * @filp: the file structure
2330  * @buffer: the user buffer
2331  * @lenp: the size of the user buffer
2332  * @ppos: file position
2333  *
2334  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2335  * values from/to the user buffer, treated as an ASCII string. The values
2336  * are treated as milliseconds, and converted to jiffies when they are stored.
2337  *
2338  * This routine will ensure the values are within the range specified by
2339  * table->extra1 (min) and table->extra2 (max).
2340  *
2341  * Returns 0 on success.
2342  */
2343 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2344                                       struct file *filp,
2345                                       void __user *buffer,
2346                                       size_t *lenp, loff_t *ppos)
2347 {
2348     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2349                                      lenp, ppos, HZ, 1000l);
2350 }
2351
2352
2353 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2354                                          int *valp,
2355                                          int write, void *data)
2356 {
2357         if (write) {
2358                 if (*lvalp > LONG_MAX / HZ)
2359                         return 1;
2360                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2361         } else {
2362                 int val = *valp;
2363                 unsigned long lval;
2364                 if (val < 0) {
2365                         *negp = -1;
2366                         lval = (unsigned long)-val;
2367                 } else {
2368                         *negp = 0;
2369                         lval = (unsigned long)val;
2370                 }
2371                 *lvalp = lval / HZ;
2372         }
2373         return 0;
2374 }
2375
2376 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2377                                                 int *valp,
2378                                                 int write, void *data)
2379 {
2380         if (write) {
2381                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2382                         return 1;
2383                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2384         } else {
2385                 int val = *valp;
2386                 unsigned long lval;
2387                 if (val < 0) {
2388                         *negp = -1;
2389                         lval = (unsigned long)-val;
2390                 } else {
2391                         *negp = 0;
2392                         lval = (unsigned long)val;
2393                 }
2394                 *lvalp = jiffies_to_clock_t(lval);
2395         }
2396         return 0;
2397 }
2398
2399 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2400                                             int *valp,
2401                                             int write, void *data)
2402 {
2403         if (write) {
2404                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2405         } else {
2406                 int val = *valp;
2407                 unsigned long lval;
2408                 if (val < 0) {
2409                         *negp = -1;
2410                         lval = (unsigned long)-val;
2411                 } else {
2412                         *negp = 0;
2413                         lval = (unsigned long)val;
2414                 }
2415                 *lvalp = jiffies_to_msecs(lval);
2416         }
2417         return 0;
2418 }
2419
2420 /**
2421  * proc_dointvec_jiffies - read a vector of integers as seconds
2422  * @table: the sysctl table
2423  * @write: %TRUE if this is a write to the sysctl file
2424  * @filp: the file structure
2425  * @buffer: the user buffer
2426  * @lenp: the size of the user buffer
2427  * @ppos: file position
2428  *
2429  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2430  * values from/to the user buffer, treated as an ASCII string.
2431  * The values read are assumed to be in seconds, and are converted into
2432  * jiffies.
2433  *
2434  * Returns 0 on success.
2435  */
2436 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2437                           void __user *buffer, size_t *lenp, loff_t *ppos)
2438 {
2439     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2440                             do_proc_dointvec_jiffies_conv,NULL);
2441 }
2442
2443 /**
2444  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2445  * @table: the sysctl table
2446  * @write: %TRUE if this is a write to the sysctl file
2447  * @filp: the file structure
2448  * @buffer: the user buffer
2449  * @lenp: the size of the user buffer
2450  * @ppos: pointer to the file position
2451  *
2452  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2453  * values from/to the user buffer, treated as an ASCII string.
2454  * The values read are assumed to be in 1/USER_HZ seconds, and
2455  * are converted into jiffies.
2456  *
2457  * Returns 0 on success.
2458  */
2459 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2460                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2461 {
2462     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2463                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2464 }
2465
2466 /**
2467  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2468  * @table: the sysctl table
2469  * @write: %TRUE if this is a write to the sysctl file
2470  * @filp: the file structure
2471  * @buffer: the user buffer
2472  * @lenp: the size of the user buffer
2473  * @ppos: file position
2474  * @ppos: the current position in the file
2475  *
2476  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2477  * values from/to the user buffer, treated as an ASCII string.
2478  * The values read are assumed to be in 1/1000 seconds, and
2479  * are converted into jiffies.
2480  *
2481  * Returns 0 on success.
2482  */
2483 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2484                              void __user *buffer, size_t *lenp, loff_t *ppos)
2485 {
2486         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2487                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2488 }
2489
2490 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2491                            void __user *buffer, size_t *lenp, loff_t *ppos)
2492 {
2493         struct pid *new_pid;
2494         pid_t tmp;
2495         int r;
2496
2497         tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
2498
2499         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2500                                lenp, ppos, NULL, NULL);
2501         if (r || !write)
2502                 return r;
2503
2504         new_pid = find_get_pid(tmp);
2505         if (!new_pid)
2506                 return -ESRCH;
2507
2508         put_pid(xchg(&cad_pid, new_pid));
2509         return 0;
2510 }
2511
2512 #else /* CONFIG_PROC_FS */
2513
2514 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2515                   void __user *buffer, size_t *lenp, loff_t *ppos)
2516 {
2517         return -ENOSYS;
2518 }
2519
2520 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2521                   void __user *buffer, size_t *lenp, loff_t *ppos)
2522 {
2523         return -ENOSYS;
2524 }
2525
2526 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2527                         void __user *buffer, size_t *lenp, loff_t *ppos)
2528 {
2529         return -ENOSYS;
2530 }
2531
2532 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2533                     void __user *buffer, size_t *lenp, loff_t *ppos)
2534 {
2535         return -ENOSYS;
2536 }
2537
2538 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2539                     void __user *buffer, size_t *lenp, loff_t *ppos)
2540 {
2541         return -ENOSYS;
2542 }
2543
2544 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2545                     void __user *buffer, size_t *lenp, loff_t *ppos)
2546 {
2547         return -ENOSYS;
2548 }
2549
2550 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2551                              void __user *buffer, size_t *lenp, loff_t *ppos)
2552 {
2553         return -ENOSYS;
2554 }
2555
2556 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2557                     void __user *buffer, size_t *lenp, loff_t *ppos)
2558 {
2559         return -ENOSYS;
2560 }
2561
2562 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2563                                       struct file *filp,
2564                                       void __user *buffer,
2565                                       size_t *lenp, loff_t *ppos)
2566 {
2567     return -ENOSYS;
2568 }
2569
2570
2571 #endif /* CONFIG_PROC_FS */
2572
2573
2574 #ifdef CONFIG_SYSCTL_SYSCALL
2575 /*
2576  * General sysctl support routines
2577  */
2578
2579 /* The generic sysctl data routine (used if no strategy routine supplied) */
2580 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2581                 void __user *oldval, size_t __user *oldlenp,
2582                 void __user *newval, size_t newlen)
2583 {
2584         size_t len;
2585
2586         /* Get out of I don't have a variable */
2587         if (!table->data || !table->maxlen)
2588                 return -ENOTDIR;
2589
2590         if (oldval && oldlenp) {
2591                 if (get_user(len, oldlenp))
2592                         return -EFAULT;
2593                 if (len) {
2594                         if (len > table->maxlen)
2595                                 len = table->maxlen;
2596                         if (copy_to_user(oldval, table->data, len))
2597                                 return -EFAULT;
2598                         if (put_user(len, oldlenp))
2599                                 return -EFAULT;
2600                 }
2601         }
2602
2603         if (newval && newlen) {
2604                 if (newlen > table->maxlen)
2605                         newlen = table->maxlen;
2606
2607                 if (copy_from_user(table->data, newval, newlen))
2608                         return -EFAULT;
2609         }
2610         return 1;
2611 }
2612
2613 /* The generic string strategy routine: */
2614 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2615                   void __user *oldval, size_t __user *oldlenp,
2616                   void __user *newval, size_t newlen)
2617 {
2618         if (!table->data || !table->maxlen)
2619                 return -ENOTDIR;
2620
2621         if (oldval && oldlenp) {
2622                 size_t bufsize;
2623                 if (get_user(bufsize, oldlenp))
2624                         return -EFAULT;
2625                 if (bufsize) {
2626                         size_t len = strlen(table->data), copied;
2627
2628                         /* This shouldn't trigger for a well-formed sysctl */
2629                         if (len > table->maxlen)
2630                                 len = table->maxlen;
2631
2632                         /* Copy up to a max of bufsize-1 bytes of the string */
2633                         copied = (len >= bufsize) ? bufsize - 1 : len;
2634
2635                         if (copy_to_user(oldval, table->data, copied) ||
2636                             put_user(0, (char __user *)(oldval + copied)))
2637                                 return -EFAULT;
2638                         if (put_user(len, oldlenp))
2639                                 return -EFAULT;
2640                 }
2641         }
2642         if (newval && newlen) {
2643                 size_t len = newlen;
2644                 if (len > table->maxlen)
2645                         len = table->maxlen;
2646                 if(copy_from_user(table->data, newval, len))
2647                         return -EFAULT;
2648                 if (len == table->maxlen)
2649                         len--;
2650                 ((char *) table->data)[len] = 0;
2651         }
2652         return 1;
2653 }
2654
2655 /*
2656  * This function makes sure that all of the integers in the vector
2657  * are between the minimum and maximum values given in the arrays
2658  * table->extra1 and table->extra2, respectively.
2659  */
2660 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2661                 void __user *oldval, size_t __user *oldlenp,
2662                 void __user *newval, size_t newlen)
2663 {
2664
2665         if (newval && newlen) {
2666                 int __user *vec = (int __user *) newval;
2667                 int *min = (int *) table->extra1;
2668                 int *max = (int *) table->extra2;
2669                 size_t length;
2670                 int i;
2671
2672                 if (newlen % sizeof(int) != 0)
2673                         return -EINVAL;
2674
2675                 if (!table->extra1 && !table->extra2)
2676                         return 0;
2677
2678                 if (newlen > table->maxlen)
2679                         newlen = table->maxlen;
2680                 length = newlen / sizeof(int);
2681
2682                 for (i = 0; i < length; i++) {
2683                         int value;
2684                         if (get_user(value, vec + i))
2685                                 return -EFAULT;
2686                         if (min && value < min[i])
2687                                 return -EINVAL;
2688                         if (max && value > max[i])
2689                                 return -EINVAL;
2690                 }
2691         }
2692         return 0;
2693 }
2694
2695 /* Strategy function to convert jiffies to seconds */
2696 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2697                 void __user *oldval, size_t __user *oldlenp,
2698                 void __user *newval, size_t newlen)
2699 {
2700         if (oldval && oldlenp) {
2701                 size_t olen;
2702
2703                 if (get_user(olen, oldlenp))
2704                         return -EFAULT;
2705                 if (olen) {
2706                         int val;
2707
2708                         if (olen < sizeof(int))
2709                                 return -EINVAL;
2710
2711                         val = *(int *)(table->data) / HZ;
2712                         if (put_user(val, (int __user *)oldval))
2713                                 return -EFAULT;
2714                         if (put_user(sizeof(int), oldlenp))
2715                                 return -EFAULT;
2716                 }
2717         }
2718         if (newval && newlen) {
2719                 int new;
2720                 if (newlen != sizeof(int))
2721                         return -EINVAL;
2722                 if (get_user(new, (int __user *)newval))
2723                         return -EFAULT;
2724                 *(int *)(table->data) = new*HZ;
2725         }
2726         return 1;
2727 }
2728
2729 /* Strategy function to convert jiffies to seconds */
2730 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2731                 void __user *oldval, size_t __user *oldlenp,
2732                 void __user *newval, size_t newlen)
2733 {
2734         if (oldval && oldlenp) {
2735                 size_t olen;
2736
2737                 if (get_user(olen, oldlenp))
2738                         return -EFAULT;
2739                 if (olen) {
2740                         int val;
2741
2742                         if (olen < sizeof(int))
2743                                 return -EINVAL;
2744
2745                         val = jiffies_to_msecs(*(int *)(table->data));
2746                         if (put_user(val, (int __user *)oldval))
2747                                 return -EFAULT;
2748                         if (put_user(sizeof(int), oldlenp))
2749                                 return -EFAULT;
2750                 }
2751         }
2752         if (newval && newlen) {
2753                 int new;
2754                 if (newlen != sizeof(int))
2755                         return -EINVAL;
2756                 if (get_user(new, (int __user *)newval))
2757                         return -EFAULT;
2758                 *(int *)(table->data) = msecs_to_jiffies(new);
2759         }
2760         return 1;
2761 }
2762
2763
2764
2765 #else /* CONFIG_SYSCTL_SYSCALL */
2766
2767
2768 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2769 {
2770         struct __sysctl_args tmp;
2771         int error;
2772
2773         if (copy_from_user(&tmp, args, sizeof(tmp)))
2774                 return -EFAULT;
2775
2776         error = deprecated_sysctl_warning(&tmp);
2777
2778         /* If no error reading the parameters then just -ENOSYS ... */
2779         if (!error)
2780                 error = -ENOSYS;
2781
2782         return error;
2783 }
2784
2785 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2786                   void __user *oldval, size_t __user *oldlenp,
2787                   void __user *newval, size_t newlen)
2788 {
2789         return -ENOSYS;
2790 }
2791
2792 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2793                   void __user *oldval, size_t __user *oldlenp,
2794                   void __user *newval, size_t newlen)
2795 {
2796         return -ENOSYS;
2797 }
2798
2799 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2800                 void __user *oldval, size_t __user *oldlenp,
2801                 void __user *newval, size_t newlen)
2802 {
2803         return -ENOSYS;
2804 }
2805
2806 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2807                 void __user *oldval, size_t __user *oldlenp,
2808                 void __user *newval, size_t newlen)
2809 {
2810         return -ENOSYS;
2811 }
2812
2813 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2814                 void __user *oldval, size_t __user *oldlenp,
2815                 void __user *newval, size_t newlen)
2816 {
2817         return -ENOSYS;
2818 }
2819
2820 #endif /* CONFIG_SYSCTL_SYSCALL */
2821
2822 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2823 {
2824         static int msg_count;
2825         int name[CTL_MAXNAME];
2826         int i;
2827
2828         /* Check args->nlen. */
2829         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2830                 return -ENOTDIR;
2831
2832         /* Read in the sysctl name for better debug message logging */
2833         for (i = 0; i < args->nlen; i++)
2834                 if (get_user(name[i], args->name + i))
2835                         return -EFAULT;
2836
2837         /* Ignore accesses to kernel.version */
2838         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2839                 return 0;
2840
2841         if (msg_count < 5) {
2842                 msg_count++;
2843                 printk(KERN_INFO
2844                         "warning: process `%s' used the deprecated sysctl "
2845                         "system call with ", current->comm);
2846                 for (i = 0; i < args->nlen; i++)
2847                         printk("%d.", name[i]);
2848                 printk("\n");
2849         }
2850         return 0;
2851 }
2852
2853 /*
2854  * No sense putting this after each symbol definition, twice,
2855  * exception granted :-)
2856  */
2857 EXPORT_SYMBOL(proc_dointvec);
2858 EXPORT_SYMBOL(proc_dointvec_jiffies);
2859 EXPORT_SYMBOL(proc_dointvec_minmax);
2860 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2861 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2862 EXPORT_SYMBOL(proc_dostring);
2863 EXPORT_SYMBOL(proc_doulongvec_minmax);
2864 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2865 EXPORT_SYMBOL(register_sysctl_table);
2866 EXPORT_SYMBOL(register_sysctl_paths);
2867 EXPORT_SYMBOL(sysctl_intvec);
2868 EXPORT_SYMBOL(sysctl_jiffies);
2869 EXPORT_SYMBOL(sysctl_ms_jiffies);
2870 EXPORT_SYMBOL(sysctl_string);
2871 EXPORT_SYMBOL(sysctl_data);
2872 EXPORT_SYMBOL(unregister_sysctl_table);