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   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/capability.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/capability.h>
  31 #include <linux/smp_lock.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
  49 #include <asm/uaccess.h>
  50 #include <asm/processor.h>
  51
  52 extern int proc_nr_files(ctl_table *table, int write, struct file *filp,
  53                      void __user *buffer, size_t *lenp, loff_t *ppos);
  54
  55 #ifdef CONFIG_X86
  56 #include <asm/nmi.h>
  57 #endif
  58
  59 #if defined(CONFIG_SYSCTL)
  60
  61 /* External variables not in a header file. */
  62 extern int C_A_D;
  63 extern int sysctl_overcommit_memory;
  64 extern int sysctl_overcommit_ratio;
  65 extern int sysctl_panic_on_oom;
  66 extern int max_threads;
  67 extern int sysrq_enabled;
  68 extern int core_uses_pid;
  69 extern int suid_dumpable;
  70 extern char core_pattern[];
  71 extern int pid_max;
  72 extern int min_free_kbytes;
  73 extern int printk_ratelimit_jiffies;
  74 extern int printk_ratelimit_burst;
  75 extern int pid_max_min, pid_max_max;
  76 extern int sysctl_drop_caches;
  77 extern int percpu_pagelist_fraction;
  78 extern int compat_log;
  79
  80 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
  81 static int maxolduid = 65535;
  82 static int minolduid;
  83 static int min_percpu_pagelist_fract = 8;
  84
  85 static int ngroups_max = NGROUPS_MAX;
  86
  87 #ifdef CONFIG_KMOD
  88 extern char modprobe_path[];
  89 #endif
  90 #ifdef CONFIG_CHR_DEV_SG
  91 extern int sg_big_buff;
  92 #endif
  93 #ifdef CONFIG_SYSVIPC
  94 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
  95                 void __user *buffer, size_t *lenp, loff_t *ppos);
  96 #endif
  97
  98 #ifdef __sparc__
  99 extern char reboot_command [];
 100 extern int stop_a_enabled;
 101 extern int scons_pwroff;
 102 #endif
 103
 104 #ifdef __hppa__
 105 extern int pwrsw_enabled;
 106 extern int unaligned_enabled;
 107 #endif
 108
 109 #ifdef CONFIG_S390
 110 #ifdef CONFIG_MATHEMU
 111 extern int sysctl_ieee_emulation_warnings;
 112 #endif
 113 extern int sysctl_userprocess_debug;
 114 extern int spin_retry;
 115 #endif
 116
 117 extern int sysctl_hz_timer;
 118
 119 #ifdef CONFIG_BSD_PROCESS_ACCT
 120 extern int acct_parm[];
 121 #endif
 122
 123 #ifdef CONFIG_IA64
 124 extern int no_unaligned_warning;
 125 #endif
 126
 127 #ifdef CONFIG_RT_MUTEXES
 128 extern int max_lock_depth;
 129 #endif
 130
 131 #ifdef CONFIG_SYSCTL_SYSCALL
 132 static int parse_table(int __user *, int, void __user *, size_t __user *,
 133                 void __user *, size_t, ctl_table *, void **);
 134 #endif
 135
 136 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
 137                   void __user *buffer, size_t *lenp, loff_t *ppos);
 138
 139 #ifdef CONFIG_PROC_SYSCTL
 140 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
 141                   void __user *buffer, size_t *lenp, loff_t *ppos);
 142 #endif
 143
 144 static ctl_table root_table[];
 145 static struct ctl_table_header root_table_header =
 146         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 147
 148 static ctl_table kern_table[];
 149 static ctl_table vm_table[];
 150 static ctl_table fs_table[];
 151 static ctl_table debug_table[];
 152 static ctl_table dev_table[];
 153 extern ctl_table random_table[];
 154 #ifdef CONFIG_UNIX98_PTYS
 155 extern ctl_table pty_table[];
 156 #endif
 157 #ifdef CONFIG_INOTIFY_USER
 158 extern ctl_table inotify_table[];
 159 #endif
 160
 161 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 162 int sysctl_legacy_va_layout;
 163 #endif
 164
 165 /* /proc declarations: */
 166
 167 #ifdef CONFIG_PROC_SYSCTL
 168
 169 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
 170 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
 171 static int proc_opensys(struct inode *, struct file *);
 172
 173 struct file_operations proc_sys_file_operations = {
 174         .open           = proc_opensys,
 175         .read           = proc_readsys,
 176         .write          = proc_writesys,
 177 };
 178
 179 extern struct proc_dir_entry *proc_sys_root;
 180
 181 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
 182 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
 183 #endif
 184
 185 /* The default sysctl tables: */
 186
 187 static ctl_table root_table[] = {
 188         {
 189                 .ctl_name       = CTL_KERN,
 190                 .procname       = "kernel",
 191                 .mode           = 0555,
 192                 .child          = kern_table,
 193         },
 194         {
 195                 .ctl_name       = CTL_VM,
 196                 .procname       = "vm",
 197                 .mode           = 0555,
 198                 .child          = vm_table,
 199         },
 200 #ifdef CONFIG_NET
 201         {
 202                 .ctl_name       = CTL_NET,
 203                 .procname       = "net",
 204                 .mode           = 0555,
 205                 .child          = net_table,
 206         },
 207 #endif
 208         {
 209                 .ctl_name       = CTL_FS,
 210                 .procname       = "fs",
 211                 .mode           = 0555,
 212                 .child          = fs_table,
 213         },
 214         {
 215                 .ctl_name       = CTL_DEBUG,
 216                 .procname       = "debug",
 217                 .mode           = 0555,
 218                 .child          = debug_table,
 219         },
 220         {
 221                 .ctl_name       = CTL_DEV,
 222                 .procname       = "dev",
 223                 .mode           = 0555,
 224                 .child          = dev_table,
 225         },
 226
 227         { .ctl_name = 0 }
 228 };
 229
 230 static ctl_table kern_table[] = {
 231 #ifndef CONFIG_UTS_NS
 232         {
 233                 .ctl_name       = KERN_OSTYPE,
 234                 .procname       = "ostype",
 235                 .data           = init_uts_ns.name.sysname,
 236                 .maxlen         = sizeof(init_uts_ns.name.sysname),
 237                 .mode           = 0444,
 238                 .proc_handler   = &proc_do_uts_string,
 239                 .strategy       = &sysctl_string,
 240         },
 241         {
 242                 .ctl_name       = KERN_OSRELEASE,
 243                 .procname       = "osrelease",
 244                 .data           = init_uts_ns.name.release,
 245                 .maxlen         = sizeof(init_uts_ns.name.release),
 246                 .mode           = 0444,
 247                 .proc_handler   = &proc_do_uts_string,
 248                 .strategy       = &sysctl_string,
 249         },
 250         {
 251                 .ctl_name       = KERN_VERSION,
 252                 .procname       = "version",
 253                 .data           = init_uts_ns.name.version,
 254                 .maxlen         = sizeof(init_uts_ns.name.version),
 255                 .mode           = 0444,
 256                 .proc_handler   = &proc_do_uts_string,
 257                 .strategy       = &sysctl_string,
 258         },
 259         {
 260                 .ctl_name       = KERN_NODENAME,
 261                 .procname       = "hostname",
 262                 .data           = init_uts_ns.name.nodename,
 263                 .maxlen         = sizeof(init_uts_ns.name.nodename),
 264                 .mode           = 0644,
 265                 .proc_handler   = &proc_do_uts_string,
 266                 .strategy       = &sysctl_string,
 267         },
 268         {
 269                 .ctl_name       = KERN_DOMAINNAME,
 270                 .procname       = "domainname",
 271                 .data           = init_uts_ns.name.domainname,
 272                 .maxlen         = sizeof(init_uts_ns.name.domainname),
 273                 .mode           = 0644,
 274                 .proc_handler   = &proc_do_uts_string,
 275                 .strategy       = &sysctl_string,
 276         },
 277 #else  /* !CONFIG_UTS_NS */
 278         {
 279                 .ctl_name       = KERN_OSTYPE,
 280                 .procname       = "ostype",
 281                 .data           = NULL,
 282                 /* could maybe use __NEW_UTS_LEN here? */
 283                 .maxlen         = FIELD_SIZEOF(struct new_utsname, sysname),
 284                 .mode           = 0444,
 285                 .proc_handler   = &proc_do_uts_string,
 286                 .strategy       = &sysctl_string,
 287         },
 288         {
 289                 .ctl_name       = KERN_OSRELEASE,
 290                 .procname       = "osrelease",
 291                 .data           = NULL,
 292                 .maxlen         = FIELD_SIZEOF(struct new_utsname, release),
 293                 .mode           = 0444,
 294                 .proc_handler   = &proc_do_uts_string,
 295                 .strategy       = &sysctl_string,
 296         },
 297         {
 298                 .ctl_name       = KERN_VERSION,
 299                 .procname       = "version",
 300                 .data           = NULL,
 301                 .maxlen         = FIELD_SIZEOF(struct new_utsname, version),
 302                 .mode           = 0444,
 303                 .proc_handler   = &proc_do_uts_string,
 304                 .strategy       = &sysctl_string,
 305         },
 306         {
 307                 .ctl_name       = KERN_NODENAME,
 308                 .procname       = "hostname",
 309                 .data           = NULL,
 310                 .maxlen         = FIELD_SIZEOF(struct new_utsname, nodename),
 311                 .mode           = 0644,
 312                 .proc_handler   = &proc_do_uts_string,
 313                 .strategy       = &sysctl_string,
 314         },
 315         {
 316                 .ctl_name       = KERN_DOMAINNAME,
 317                 .procname       = "domainname",
 318                 .data           = NULL,
 319                 .maxlen         = FIELD_SIZEOF(struct new_utsname, domainname),
 320                 .mode           = 0644,
 321                 .proc_handler   = &proc_do_uts_string,
 322                 .strategy       = &sysctl_string,
 323         },
 324 #endif /* !CONFIG_UTS_NS */
 325         {
 326                 .ctl_name       = KERN_PANIC,
 327                 .procname       = "panic",
 328                 .data           = &panic_timeout,
 329                 .maxlen         = sizeof(int),
 330                 .mode           = 0644,
 331                 .proc_handler   = &proc_dointvec,
 332         },
 333         {
 334                 .ctl_name       = KERN_CORE_USES_PID,
 335                 .procname       = "core_uses_pid",
 336                 .data           = &core_uses_pid,
 337                 .maxlen         = sizeof(int),
 338                 .mode           = 0644,
 339                 .proc_handler   = &proc_dointvec,
 340         },
 341         {
 342                 .ctl_name       = KERN_CORE_PATTERN,
 343                 .procname       = "core_pattern",
 344                 .data           = core_pattern,
 345                 .maxlen         = 128,
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_dostring,
 348                 .strategy       = &sysctl_string,
 349         },
 350         {
 351                 .ctl_name       = KERN_TAINTED,
 352                 .procname       = "tainted",
 353                 .data           = &tainted,
 354                 .maxlen         = sizeof(int),
 355                 .mode           = 0444,
 356                 .proc_handler   = &proc_dointvec,
 357         },
 358         {
 359                 .ctl_name       = KERN_CAP_BSET,
 360                 .procname       = "cap-bound",
 361                 .data           = &cap_bset,
 362                 .maxlen         = sizeof(kernel_cap_t),
 363                 .mode           = 0600,
 364                 .proc_handler   = &proc_dointvec_bset,
 365         },
 366 #ifdef CONFIG_BLK_DEV_INITRD
 367         {
 368                 .ctl_name       = KERN_REALROOTDEV,
 369                 .procname       = "real-root-dev",
 370                 .data           = &real_root_dev,
 371                 .maxlen         = sizeof(int),
 372                 .mode           = 0644,
 373                 .proc_handler   = &proc_dointvec,
 374         },
 375 #endif
 376 #ifdef __sparc__
 377         {
 378                 .ctl_name       = KERN_SPARC_REBOOT,
 379                 .procname       = "reboot-cmd",
 380                 .data           = reboot_command,
 381                 .maxlen         = 256,
 382                 .mode           = 0644,
 383                 .proc_handler   = &proc_dostring,
 384                 .strategy       = &sysctl_string,
 385         },
 386         {
 387                 .ctl_name       = KERN_SPARC_STOP_A,
 388                 .procname       = "stop-a",
 389                 .data           = &stop_a_enabled,
 390                 .maxlen         = sizeof (int),
 391                 .mode           = 0644,
 392                 .proc_handler   = &proc_dointvec,
 393         },
 394         {
 395                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 396                 .procname       = "scons-poweroff",
 397                 .data           = &scons_pwroff,
 398                 .maxlen         = sizeof (int),
 399                 .mode           = 0644,
 400                 .proc_handler   = &proc_dointvec,
 401         },
 402 #endif
 403 #ifdef __hppa__
 404         {
 405                 .ctl_name       = KERN_HPPA_PWRSW,
 406                 .procname       = "soft-power",
 407                 .data           = &pwrsw_enabled,
 408                 .maxlen         = sizeof (int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec,
 411         },
 412         {
 413                 .ctl_name       = KERN_HPPA_UNALIGNED,
 414                 .procname       = "unaligned-trap",
 415                 .data           = &unaligned_enabled,
 416                 .maxlen         = sizeof (int),
 417                 .mode           = 0644,
 418                 .proc_handler   = &proc_dointvec,
 419         },
 420 #endif
 421         {
 422                 .ctl_name       = KERN_CTLALTDEL,
 423                 .procname       = "ctrl-alt-del",
 424                 .data           = &C_A_D,
 425                 .maxlen         = sizeof(int),
 426                 .mode           = 0644,
 427                 .proc_handler   = &proc_dointvec,
 428         },
 429         {
 430                 .ctl_name       = KERN_PRINTK,
 431                 .procname       = "printk",
 432                 .data           = &console_loglevel,
 433                 .maxlen         = 4*sizeof(int),
 434                 .mode           = 0644,
 435                 .proc_handler   = &proc_dointvec,
 436         },
 437 #ifdef CONFIG_KMOD
 438         {
 439                 .ctl_name       = KERN_MODPROBE,
 440                 .procname       = "modprobe",
 441                 .data           = &modprobe_path,
 442                 .maxlen         = KMOD_PATH_LEN,
 443                 .mode           = 0644,
 444                 .proc_handler   = &proc_dostring,
 445                 .strategy       = &sysctl_string,
 446         },
 447 #endif
 448 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 449         {
 450                 .ctl_name       = KERN_HOTPLUG,
 451                 .procname       = "hotplug",
 452                 .data           = &uevent_helper,
 453                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dostring,
 456                 .strategy       = &sysctl_string,
 457         },
 458 #endif
 459 #ifdef CONFIG_CHR_DEV_SG
 460         {
 461                 .ctl_name       = KERN_SG_BIG_BUFF,
 462                 .procname       = "sg-big-buff",
 463                 .data           = &sg_big_buff,
 464                 .maxlen         = sizeof (int),
 465                 .mode           = 0444,
 466                 .proc_handler   = &proc_dointvec,
 467         },
 468 #endif
 469 #ifdef CONFIG_BSD_PROCESS_ACCT
 470         {
 471                 .ctl_name       = KERN_ACCT,
 472                 .procname       = "acct",
 473                 .data           = &acct_parm,
 474                 .maxlen         = 3*sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = &proc_dointvec,
 477         },
 478 #endif
 479 #ifdef CONFIG_SYSVIPC
 480         {
 481                 .ctl_name       = KERN_SHMMAX,
 482                 .procname       = "shmmax",
 483                 .data           = NULL,
 484                 .maxlen         = sizeof (size_t),
 485                 .mode           = 0644,
 486                 .proc_handler   = &proc_do_ipc_string,
 487         },
 488         {
 489                 .ctl_name       = KERN_SHMALL,
 490                 .procname       = "shmall",
 491                 .data           = NULL,
 492                 .maxlen         = sizeof (size_t),
 493                 .mode           = 0644,
 494                 .proc_handler   = &proc_do_ipc_string,
 495         },
 496         {
 497                 .ctl_name       = KERN_SHMMNI,
 498                 .procname       = "shmmni",
 499                 .data           = NULL,
 500                 .maxlen         = sizeof (int),
 501                 .mode           = 0644,
 502                 .proc_handler   = &proc_do_ipc_string,
 503         },
 504         {
 505                 .ctl_name       = KERN_MSGMAX,
 506                 .procname       = "msgmax",
 507                 .data           = NULL,
 508                 .maxlen         = sizeof (int),
 509                 .mode           = 0644,
 510                 .proc_handler   = &proc_do_ipc_string,
 511         },
 512         {
 513                 .ctl_name       = KERN_MSGMNI,
 514                 .procname       = "msgmni",
 515                 .data           = NULL,
 516                 .maxlen         = sizeof (int),
 517                 .mode           = 0644,
 518                 .proc_handler   = &proc_do_ipc_string,
 519         },
 520         {
 521                 .ctl_name       = KERN_MSGMNB,
 522                 .procname       =  "msgmnb",
 523                 .data           = NULL,
 524                 .maxlen         = sizeof (int),
 525                 .mode           = 0644,
 526                 .proc_handler   = &proc_do_ipc_string,
 527         },
 528         {
 529                 .ctl_name       = KERN_SEM,
 530                 .procname       = "sem",
 531                 .data           = NULL,
 532                 .maxlen         = 4*sizeof (int),
 533                 .mode           = 0644,
 534                 .proc_handler   = &proc_do_ipc_string,
 535         },
 536 #endif
 537 #ifdef CONFIG_MAGIC_SYSRQ
 538         {
 539                 .ctl_name       = KERN_SYSRQ,
 540                 .procname       = "sysrq",
 541                 .data           = &sysrq_enabled,
 542                 .maxlen         = sizeof (int),
 543                 .mode           = 0644,
 544                 .proc_handler   = &proc_dointvec,
 545         },
 546 #endif
 547 #ifdef CONFIG_PROC_SYSCTL
 548         {
 549                 .ctl_name       = KERN_CADPID,
 550                 .procname       = "cad_pid",
 551                 .data           = NULL,
 552                 .maxlen         = sizeof (int),
 553                 .mode           = 0600,
 554                 .proc_handler   = &proc_do_cad_pid,
 555         },
 556 #endif
 557         {
 558                 .ctl_name       = KERN_MAX_THREADS,
 559                 .procname       = "threads-max",
 560                 .data           = &max_threads,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec,
 564         },
 565         {
 566                 .ctl_name       = KERN_RANDOM,
 567                 .procname       = "random",
 568                 .mode           = 0555,
 569                 .child          = random_table,
 570         },
 571 #ifdef CONFIG_UNIX98_PTYS
 572         {
 573                 .ctl_name       = KERN_PTY,
 574                 .procname       = "pty",
 575                 .mode           = 0555,
 576                 .child          = pty_table,
 577         },
 578 #endif
 579         {
 580                 .ctl_name       = KERN_OVERFLOWUID,
 581                 .procname       = "overflowuid",
 582                 .data           = &overflowuid,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec_minmax,
 586                 .strategy       = &sysctl_intvec,
 587                 .extra1         = &minolduid,
 588                 .extra2         = &maxolduid,
 589         },
 590         {
 591                 .ctl_name       = KERN_OVERFLOWGID,
 592                 .procname       = "overflowgid",
 593                 .data           = &overflowgid,
 594                 .maxlen         = sizeof(int),
 595                 .mode           = 0644,
 596                 .proc_handler   = &proc_dointvec_minmax,
 597                 .strategy       = &sysctl_intvec,
 598                 .extra1         = &minolduid,
 599                 .extra2         = &maxolduid,
 600         },
 601 #ifdef CONFIG_S390
 602 #ifdef CONFIG_MATHEMU
 603         {
 604                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 605                 .procname       = "ieee_emulation_warnings",
 606                 .data           = &sysctl_ieee_emulation_warnings,
 607                 .maxlen         = sizeof(int),
 608                 .mode           = 0644,
 609                 .proc_handler   = &proc_dointvec,
 610         },
 611 #endif
 612 #ifdef CONFIG_NO_IDLE_HZ
 613         {
 614                 .ctl_name       = KERN_HZ_TIMER,
 615                 .procname       = "hz_timer",
 616                 .data           = &sysctl_hz_timer,
 617                 .maxlen         = sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec,
 620         },
 621 #endif
 622         {
 623                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 624                 .procname       = "userprocess_debug",
 625                 .data           = &sysctl_userprocess_debug,
 626                 .maxlen         = sizeof(int),
 627                 .mode           = 0644,
 628                 .proc_handler   = &proc_dointvec,
 629         },
 630 #endif
 631         {
 632                 .ctl_name       = KERN_PIDMAX,
 633                 .procname       = "pid_max",
 634                 .data           = &pid_max,
 635                 .maxlen         = sizeof (int),
 636                 .mode           = 0644,
 637                 .proc_handler   = &proc_dointvec_minmax,
 638                 .strategy       = sysctl_intvec,
 639                 .extra1         = &pid_max_min,
 640                 .extra2         = &pid_max_max,
 641         },
 642         {
 643                 .ctl_name       = KERN_PANIC_ON_OOPS,
 644                 .procname       = "panic_on_oops",
 645                 .data           = &panic_on_oops,
 646                 .maxlen         = sizeof(int),
 647                 .mode           = 0644,
 648                 .proc_handler   = &proc_dointvec,
 649         },
 650         {
 651                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 652                 .procname       = "printk_ratelimit",
 653                 .data           = &printk_ratelimit_jiffies,
 654                 .maxlen         = sizeof(int),
 655                 .mode           = 0644,
 656                 .proc_handler   = &proc_dointvec_jiffies,
 657                 .strategy       = &sysctl_jiffies,
 658         },
 659         {
 660                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 661                 .procname       = "printk_ratelimit_burst",
 662                 .data           = &printk_ratelimit_burst,
 663                 .maxlen         = sizeof(int),
 664                 .mode           = 0644,
 665                 .proc_handler   = &proc_dointvec,
 666         },
 667         {
 668                 .ctl_name       = KERN_NGROUPS_MAX,
 669                 .procname       = "ngroups_max",
 670                 .data           = &ngroups_max,
 671                 .maxlen         = sizeof (int),
 672                 .mode           = 0444,
 673                 .proc_handler   = &proc_dointvec,
 674         },
 675 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 676         {
 677                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 678                 .procname       = "unknown_nmi_panic",
 679                 .data           = &unknown_nmi_panic,
 680                 .maxlen         = sizeof (int),
 681                 .mode           = 0644,
 682                 .proc_handler   = &proc_dointvec,
 683         },
 684         {
 685                 .ctl_name       = KERN_NMI_WATCHDOG,
 686                 .procname       = "nmi_watchdog",
 687                 .data           = &nmi_watchdog_enabled,
 688                 .maxlen         = sizeof (int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_nmi_enabled,
 691         },
 692 #endif
 693 #if defined(CONFIG_X86)
 694         {
 695                 .ctl_name       = KERN_PANIC_ON_NMI,
 696                 .procname       = "panic_on_unrecovered_nmi",
 697                 .data           = &panic_on_unrecovered_nmi,
 698                 .maxlen         = sizeof(int),
 699                 .mode           = 0644,
 700                 .proc_handler   = &proc_dointvec,
 701         },
 702         {
 703                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 704                 .procname       = "bootloader_type",
 705                 .data           = &bootloader_type,
 706                 .maxlen         = sizeof (int),
 707                 .mode           = 0444,
 708                 .proc_handler   = &proc_dointvec,
 709         },
 710 #endif
 711 #if defined(CONFIG_MMU)
 712         {
 713                 .ctl_name       = KERN_RANDOMIZE,
 714                 .procname       = "randomize_va_space",
 715                 .data           = &randomize_va_space,
 716                 .maxlen         = sizeof(int),
 717                 .mode           = 0644,
 718                 .proc_handler   = &proc_dointvec,
 719         },
 720 #endif
 721 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 722         {
 723                 .ctl_name       = KERN_SPIN_RETRY,
 724                 .procname       = "spin_retry",
 725                 .data           = &spin_retry,
 726                 .maxlen         = sizeof (int),
 727                 .mode           = 0644,
 728                 .proc_handler   = &proc_dointvec,
 729         },
 730 #endif
 731 #ifdef CONFIG_ACPI_SLEEP
 732         {
 733                 .ctl_name       = KERN_ACPI_VIDEO_FLAGS,
 734                 .procname       = "acpi_video_flags",
 735                 .data           = &acpi_video_flags,
 736                 .maxlen         = sizeof (unsigned long),
 737                 .mode           = 0644,
 738                 .proc_handler   = &proc_doulongvec_minmax,
 739         },
 740 #endif
 741 #ifdef CONFIG_IA64
 742         {
 743                 .ctl_name       = KERN_IA64_UNALIGNED,
 744                 .procname       = "ignore-unaligned-usertrap",
 745                 .data           = &no_unaligned_warning,
 746                 .maxlen         = sizeof (int),
 747                 .mode           = 0644,
 748                 .proc_handler   = &proc_dointvec,
 749         },
 750 #endif
 751 #ifdef CONFIG_COMPAT
 752         {
 753                 .ctl_name       = KERN_COMPAT_LOG,
 754                 .procname       = "compat-log",
 755                 .data           = &compat_log,
 756                 .maxlen         = sizeof (int),
 757                 .mode           = 0644,
 758                 .proc_handler   = &proc_dointvec,
 759         },
 760 #endif
 761 #ifdef CONFIG_RT_MUTEXES
 762         {
 763                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 764                 .procname       = "max_lock_depth",
 765                 .data           = &max_lock_depth,
 766                 .maxlen         = sizeof(int),
 767                 .mode           = 0644,
 768                 .proc_handler   = &proc_dointvec,
 769         },
 770 #endif
 771
 772         { .ctl_name = 0 }
 773 };
 774
 775 /* Constants for minimum and maximum testing in vm_table.
 776    We use these as one-element integer vectors. */
 777 static int zero;
 778 static int one_hundred = 100;
 779
 780
 781 static ctl_table vm_table[] = {
 782         {
 783                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 784                 .procname       = "overcommit_memory",
 785                 .data           = &sysctl_overcommit_memory,
 786                 .maxlen         = sizeof(sysctl_overcommit_memory),
 787                 .mode           = 0644,
 788                 .proc_handler   = &proc_dointvec,
 789         },
 790         {
 791                 .ctl_name       = VM_PANIC_ON_OOM,
 792                 .procname       = "panic_on_oom",
 793                 .data           = &sysctl_panic_on_oom,
 794                 .maxlen         = sizeof(sysctl_panic_on_oom),
 795                 .mode           = 0644,
 796                 .proc_handler   = &proc_dointvec,
 797         },
 798         {
 799                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 800                 .procname       = "overcommit_ratio",
 801                 .data           = &sysctl_overcommit_ratio,
 802                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 803                 .mode           = 0644,
 804                 .proc_handler   = &proc_dointvec,
 805         },
 806         {
 807                 .ctl_name       = VM_PAGE_CLUSTER,
 808                 .procname       = "page-cluster",
 809                 .data           = &page_cluster,
 810                 .maxlen         = sizeof(int),
 811                 .mode           = 0644,
 812                 .proc_handler   = &proc_dointvec,
 813         },
 814         {
 815                 .ctl_name       = VM_DIRTY_BACKGROUND,
 816                 .procname       = "dirty_background_ratio",
 817                 .data           = &dirty_background_ratio,
 818                 .maxlen         = sizeof(dirty_background_ratio),
 819                 .mode           = 0644,
 820                 .proc_handler   = &proc_dointvec_minmax,
 821                 .strategy       = &sysctl_intvec,
 822                 .extra1         = &zero,
 823                 .extra2         = &one_hundred,
 824         },
 825         {
 826                 .ctl_name       = VM_DIRTY_RATIO,
 827                 .procname       = "dirty_ratio",
 828                 .data           = &vm_dirty_ratio,
 829                 .maxlen         = sizeof(vm_dirty_ratio),
 830                 .mode           = 0644,
 831                 .proc_handler   = &proc_dointvec_minmax,
 832                 .strategy       = &sysctl_intvec,
 833                 .extra1         = &zero,
 834                 .extra2         = &one_hundred,
 835         },
 836         {
 837                 .ctl_name       = VM_DIRTY_WB_CS,
 838                 .procname       = "dirty_writeback_centisecs",
 839                 .data           = &dirty_writeback_interval,
 840                 .maxlen         = sizeof(dirty_writeback_interval),
 841                 .mode           = 0644,
 842                 .proc_handler   = &dirty_writeback_centisecs_handler,
 843         },
 844         {
 845                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
 846                 .procname       = "dirty_expire_centisecs",
 847                 .data           = &dirty_expire_interval,
 848                 .maxlen         = sizeof(dirty_expire_interval),
 849                 .mode           = 0644,
 850                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 851         },
 852         {
 853                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 854                 .procname       = "nr_pdflush_threads",
 855                 .data           = &nr_pdflush_threads,
 856                 .maxlen         = sizeof nr_pdflush_threads,
 857                 .mode           = 0444 /* read-only*/,
 858                 .proc_handler   = &proc_dointvec,
 859         },
 860         {
 861                 .ctl_name       = VM_SWAPPINESS,
 862                 .procname       = "swappiness",
 863                 .data           = &vm_swappiness,
 864                 .maxlen         = sizeof(vm_swappiness),
 865                 .mode           = 0644,
 866                 .proc_handler   = &proc_dointvec_minmax,
 867                 .strategy       = &sysctl_intvec,
 868                 .extra1         = &zero,
 869                 .extra2         = &one_hundred,
 870         },
 871 #ifdef CONFIG_HUGETLB_PAGE
 872          {
 873                 .ctl_name       = VM_HUGETLB_PAGES,
 874                 .procname       = "nr_hugepages",
 875                 .data           = &max_huge_pages,
 876                 .maxlen         = sizeof(unsigned long),
 877                 .mode           = 0644,
 878                 .proc_handler   = &hugetlb_sysctl_handler,
 879                 .extra1         = (void *)&hugetlb_zero,
 880                 .extra2         = (void *)&hugetlb_infinity,
 881          },
 882          {
 883                 .ctl_name       = VM_HUGETLB_GROUP,
 884                 .procname       = "hugetlb_shm_group",
 885                 .data           = &sysctl_hugetlb_shm_group,
 886                 .maxlen         = sizeof(gid_t),
 887                 .mode           = 0644,
 888                 .proc_handler   = &proc_dointvec,
 889          },
 890 #endif
 891         {
 892                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 893                 .procname       = "lowmem_reserve_ratio",
 894                 .data           = &sysctl_lowmem_reserve_ratio,
 895                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 896                 .mode           = 0644,
 897                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 898                 .strategy       = &sysctl_intvec,
 899         },
 900         {
 901                 .ctl_name       = VM_DROP_PAGECACHE,
 902                 .procname       = "drop_caches",
 903                 .data           = &sysctl_drop_caches,
 904                 .maxlen         = sizeof(int),
 905                 .mode           = 0644,
 906                 .proc_handler   = drop_caches_sysctl_handler,
 907                 .strategy       = &sysctl_intvec,
 908         },
 909         {
 910                 .ctl_name       = VM_MIN_FREE_KBYTES,
 911                 .procname       = "min_free_kbytes",
 912                 .data           = &min_free_kbytes,
 913                 .maxlen         = sizeof(min_free_kbytes),
 914                 .mode           = 0644,
 915                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 916                 .strategy       = &sysctl_intvec,
 917                 .extra1         = &zero,
 918         },
 919         {
 920                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 921                 .procname       = "percpu_pagelist_fraction",
 922                 .data           = &percpu_pagelist_fraction,
 923                 .maxlen         = sizeof(percpu_pagelist_fraction),
 924                 .mode           = 0644,
 925                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 926                 .strategy       = &sysctl_intvec,
 927                 .extra1         = &min_percpu_pagelist_fract,
 928         },
 929 #ifdef CONFIG_MMU
 930         {
 931                 .ctl_name       = VM_MAX_MAP_COUNT,
 932                 .procname       = "max_map_count",
 933                 .data           = &sysctl_max_map_count,
 934                 .maxlen         = sizeof(sysctl_max_map_count),
 935                 .mode           = 0644,
 936                 .proc_handler   = &proc_dointvec
 937         },
 938 #endif
 939         {
 940                 .ctl_name       = VM_LAPTOP_MODE,
 941                 .procname       = "laptop_mode",
 942                 .data           = &laptop_mode,
 943                 .maxlen         = sizeof(laptop_mode),
 944                 .mode           = 0644,
 945                 .proc_handler   = &proc_dointvec_jiffies,
 946                 .strategy       = &sysctl_jiffies,
 947         },
 948         {
 949                 .ctl_name       = VM_BLOCK_DUMP,
 950                 .procname       = "block_dump",
 951                 .data           = &block_dump,
 952                 .maxlen         = sizeof(block_dump),
 953                 .mode           = 0644,
 954                 .proc_handler   = &proc_dointvec,
 955                 .strategy       = &sysctl_intvec,
 956                 .extra1         = &zero,
 957         },
 958         {
 959                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 960                 .procname       = "vfs_cache_pressure",
 961                 .data           = &sysctl_vfs_cache_pressure,
 962                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 963                 .mode           = 0644,
 964                 .proc_handler   = &proc_dointvec,
 965                 .strategy       = &sysctl_intvec,
 966                 .extra1         = &zero,
 967         },
 968 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 969         {
 970                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 971                 .procname       = "legacy_va_layout",
 972                 .data           = &sysctl_legacy_va_layout,
 973                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 974                 .mode           = 0644,
 975                 .proc_handler   = &proc_dointvec,
 976                 .strategy       = &sysctl_intvec,
 977                 .extra1         = &zero,
 978         },
 979 #endif
 980 #ifdef CONFIG_NUMA
 981         {
 982                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
 983                 .procname       = "zone_reclaim_mode",
 984                 .data           = &zone_reclaim_mode,
 985                 .maxlen         = sizeof(zone_reclaim_mode),
 986                 .mode           = 0644,
 987                 .proc_handler   = &proc_dointvec,
 988                 .strategy       = &sysctl_intvec,
 989                 .extra1         = &zero,
 990         },
 991         {
 992                 .ctl_name       = VM_MIN_UNMAPPED,
 993                 .procname       = "min_unmapped_ratio",
 994                 .data           = &sysctl_min_unmapped_ratio,
 995                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
 996                 .mode           = 0644,
 997                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
 998                 .strategy       = &sysctl_intvec,
 999                 .extra1         = &zero,
1000                 .extra2         = &one_hundred,
1001         },
1002         {
1003                 .ctl_name       = VM_MIN_SLAB,
1004                 .procname       = "min_slab_ratio",
1005                 .data           = &sysctl_min_slab_ratio,
1006                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1007                 .mode           = 0644,
1008                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1009                 .strategy       = &sysctl_intvec,
1010                 .extra1         = &zero,
1011                 .extra2         = &one_hundred,
1012         },
1013 #endif
1014 #ifdef CONFIG_X86_32
1015         {
1016                 .ctl_name       = VM_VDSO_ENABLED,
1017                 .procname       = "vdso_enabled",
1018                 .data           = &vdso_enabled,
1019                 .maxlen         = sizeof(vdso_enabled),
1020                 .mode           = 0644,
1021                 .proc_handler   = &proc_dointvec,
1022                 .strategy       = &sysctl_intvec,
1023                 .extra1         = &zero,
1024         },
1025 #endif
1026         { .ctl_name = 0 }
1027 };
1028
1029 static ctl_table fs_table[] = {
1030         {
1031                 .ctl_name       = FS_NRINODE,
1032                 .procname       = "inode-nr",
1033                 .data           = &inodes_stat,
1034                 .maxlen         = 2*sizeof(int),
1035                 .mode           = 0444,
1036                 .proc_handler   = &proc_dointvec,
1037         },
1038         {
1039                 .ctl_name       = FS_STATINODE,
1040                 .procname       = "inode-state",
1041                 .data           = &inodes_stat,
1042                 .maxlen         = 7*sizeof(int),
1043                 .mode           = 0444,
1044                 .proc_handler   = &proc_dointvec,
1045         },
1046         {
1047                 .ctl_name       = FS_NRFILE,
1048                 .procname       = "file-nr",
1049                 .data           = &files_stat,
1050                 .maxlen         = 3*sizeof(int),
1051                 .mode           = 0444,
1052                 .proc_handler   = &proc_nr_files,
1053         },
1054         {
1055                 .ctl_name       = FS_MAXFILE,
1056                 .procname       = "file-max",
1057                 .data           = &files_stat.max_files,
1058                 .maxlen         = sizeof(int),
1059                 .mode           = 0644,
1060                 .proc_handler   = &proc_dointvec,
1061         },
1062         {
1063                 .ctl_name       = FS_DENTRY,
1064                 .procname       = "dentry-state",
1065                 .data           = &dentry_stat,
1066                 .maxlen         = 6*sizeof(int),
1067                 .mode           = 0444,
1068                 .proc_handler   = &proc_dointvec,
1069         },
1070         {
1071                 .ctl_name       = FS_OVERFLOWUID,
1072                 .procname       = "overflowuid",
1073                 .data           = &fs_overflowuid,
1074                 .maxlen         = sizeof(int),
1075                 .mode           = 0644,
1076                 .proc_handler   = &proc_dointvec_minmax,
1077                 .strategy       = &sysctl_intvec,
1078                 .extra1         = &minolduid,
1079                 .extra2         = &maxolduid,
1080         },
1081         {
1082                 .ctl_name       = FS_OVERFLOWGID,
1083                 .procname       = "overflowgid",
1084                 .data           = &fs_overflowgid,
1085                 .maxlen         = sizeof(int),
1086                 .mode           = 0644,
1087                 .proc_handler   = &proc_dointvec_minmax,
1088                 .strategy       = &sysctl_intvec,
1089                 .extra1         = &minolduid,
1090                 .extra2         = &maxolduid,
1091         },
1092         {
1093                 .ctl_name       = FS_LEASES,
1094                 .procname       = "leases-enable",
1095                 .data           = &leases_enable,
1096                 .maxlen         = sizeof(int),
1097                 .mode           = 0644,
1098                 .proc_handler   = &proc_dointvec,
1099         },
1100 #ifdef CONFIG_DNOTIFY
1101         {
1102                 .ctl_name       = FS_DIR_NOTIFY,
1103                 .procname       = "dir-notify-enable",
1104                 .data           = &dir_notify_enable,
1105                 .maxlen         = sizeof(int),
1106                 .mode           = 0644,
1107                 .proc_handler   = &proc_dointvec,
1108         },
1109 #endif
1110 #ifdef CONFIG_MMU
1111         {
1112                 .ctl_name       = FS_LEASE_TIME,
1113                 .procname       = "lease-break-time",
1114                 .data           = &lease_break_time,
1115                 .maxlen         = sizeof(int),
1116                 .mode           = 0644,
1117                 .proc_handler   = &proc_dointvec,
1118         },
1119         {
1120                 .ctl_name       = FS_AIO_NR,
1121                 .procname       = "aio-nr",
1122                 .data           = &aio_nr,
1123                 .maxlen         = sizeof(aio_nr),
1124                 .mode           = 0444,
1125                 .proc_handler   = &proc_doulongvec_minmax,
1126         },
1127         {
1128                 .ctl_name       = FS_AIO_MAX_NR,
1129                 .procname       = "aio-max-nr",
1130                 .data           = &aio_max_nr,
1131                 .maxlen         = sizeof(aio_max_nr),
1132                 .mode           = 0644,
1133                 .proc_handler   = &proc_doulongvec_minmax,
1134         },
1135 #ifdef CONFIG_INOTIFY_USER
1136         {
1137                 .ctl_name       = FS_INOTIFY,
1138                 .procname       = "inotify",
1139                 .mode           = 0555,
1140                 .child          = inotify_table,
1141         },
1142 #endif
1143 #endif
1144         {
1145                 .ctl_name       = KERN_SETUID_DUMPABLE,
1146                 .procname       = "suid_dumpable",
1147                 .data           = &suid_dumpable,
1148                 .maxlen         = sizeof(int),
1149                 .mode           = 0644,
1150                 .proc_handler   = &proc_dointvec,
1151         },
1152         { .ctl_name = 0 }
1153 };
1154
1155 static ctl_table debug_table[] = {
1156         { .ctl_name = 0 }
1157 };
1158
1159 static ctl_table dev_table[] = {
1160         { .ctl_name = 0 }
1161 };
1162
1163 extern void init_irq_proc (void);
1164
1165 static DEFINE_SPINLOCK(sysctl_lock);
1166
1167 /* called under sysctl_lock */
1168 static int use_table(struct ctl_table_header *p)
1169 {
1170         if (unlikely(p->unregistering))
1171                 return 0;
1172         p->used++;
1173         return 1;
1174 }
1175
1176 /* called under sysctl_lock */
1177 static void unuse_table(struct ctl_table_header *p)
1178 {
1179         if (!--p->used)
1180                 if (unlikely(p->unregistering))
1181                         complete(p->unregistering);
1182 }
1183
1184 /* called under sysctl_lock, will reacquire if has to wait */
1185 static void start_unregistering(struct ctl_table_header *p)
1186 {
1187         /*
1188          * if p->used is 0, nobody will ever touch that entry again;
1189          * we'll eliminate all paths to it before dropping sysctl_lock
1190          */
1191         if (unlikely(p->used)) {
1192                 struct completion wait;
1193                 init_completion(&wait);
1194                 p->unregistering = &wait;
1195                 spin_unlock(&sysctl_lock);
1196                 wait_for_completion(&wait);
1197                 spin_lock(&sysctl_lock);
1198         }
1199         /*
1200          * do not remove from the list until nobody holds it; walking the
1201          * list in do_sysctl() relies on that.
1202          */
1203         list_del_init(&p->ctl_entry);
1204 }
1205
1206 void __init sysctl_init(void)
1207 {
1208 #ifdef CONFIG_PROC_SYSCTL
1209         register_proc_table(root_table, proc_sys_root, &root_table_header);
1210         init_irq_proc();
1211 #endif
1212 }
1213
1214 #ifdef CONFIG_SYSCTL_SYSCALL
1215 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1216                void __user *newval, size_t newlen)
1217 {
1218         struct list_head *tmp;
1219         int error = -ENOTDIR;
1220
1221         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1222                 return -ENOTDIR;
1223         if (oldval) {
1224                 int old_len;
1225                 if (!oldlenp || get_user(old_len, oldlenp))
1226                         return -EFAULT;
1227         }
1228         spin_lock(&sysctl_lock);
1229         tmp = &root_table_header.ctl_entry;
1230         do {
1231                 struct ctl_table_header *head =
1232                         list_entry(tmp, struct ctl_table_header, ctl_entry);
1233                 void *context = NULL;
1234
1235                 if (!use_table(head))
1236                         continue;
1237
1238                 spin_unlock(&sysctl_lock);
1239
1240                 error = parse_table(name, nlen, oldval, oldlenp,
1241                                         newval, newlen, head->ctl_table,
1242                                         &context);
1243                 kfree(context);
1244
1245                 spin_lock(&sysctl_lock);
1246                 unuse_table(head);
1247                 if (error != -ENOTDIR)
1248                         break;
1249         } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1250         spin_unlock(&sysctl_lock);
1251         return error;
1252 }
1253
1254 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1255 {
1256         struct __sysctl_args tmp;
1257         int error;
1258
1259         if (copy_from_user(&tmp, args, sizeof(tmp)))
1260                 return -EFAULT;
1261
1262         lock_kernel();
1263         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1264                           tmp.newval, tmp.newlen);
1265         unlock_kernel();
1266         return error;
1267 }
1268 #endif /* CONFIG_SYSCTL_SYSCALL */
1269
1270 /*
1271  * ctl_perm does NOT grant the superuser all rights automatically, because
1272  * some sysctl variables are readonly even to root.
1273  */
1274
1275 static int test_perm(int mode, int op)
1276 {
1277         if (!current->euid)
1278                 mode >>= 6;
1279         else if (in_egroup_p(0))
1280                 mode >>= 3;
1281         if ((mode & op & 0007) == op)
1282                 return 0;
1283         return -EACCES;
1284 }
1285
1286 static inline int ctl_perm(ctl_table *table, int op)
1287 {
1288         int error;
1289         error = security_sysctl(table, op);
1290         if (error)
1291                 return error;
1292         return test_perm(table->mode, op);
1293 }
1294
1295 #ifdef CONFIG_SYSCTL_SYSCALL
1296 static int parse_table(int __user *name, int nlen,
1297                        void __user *oldval, size_t __user *oldlenp,
1298                        void __user *newval, size_t newlen,
1299                        ctl_table *table, void **context)
1300 {
1301         int n;
1302 repeat:
1303         if (!nlen)
1304                 return -ENOTDIR;
1305         if (get_user(n, name))
1306                 return -EFAULT;
1307         for ( ; table->ctl_name || table->procname; table++) {
1308                 if (!table->ctl_name)
1309                         continue;
1310                 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1311                         int error;
1312                         if (table->child) {
1313                                 if (ctl_perm(table, 001))
1314                                         return -EPERM;
1315                                 if (table->strategy) {
1316                                         error = table->strategy(
1317                                                 table, name, nlen,
1318                                                 oldval, oldlenp,
1319                                                 newval, newlen, context);
1320                                         if (error)
1321                                                 return error;
1322                                 }
1323                                 name++;
1324                                 nlen--;
1325                                 table = table->child;
1326                                 goto repeat;
1327                         }
1328                         error = do_sysctl_strategy(table, name, nlen,
1329                                                    oldval, oldlenp,
1330                                                    newval, newlen, context);
1331                         return error;
1332                 }
1333         }
1334         return -ENOTDIR;
1335 }
1336
1337 /* Perform the actual read/write of a sysctl table entry. */
1338 int do_sysctl_strategy (ctl_table *table,
1339                         int __user *name, int nlen,
1340                         void __user *oldval, size_t __user *oldlenp,
1341                         void __user *newval, size_t newlen, void **context)
1342 {
1343         int op = 0, rc;
1344         size_t len;
1345
1346         if (oldval)
1347                 op |= 004;
1348         if (newval)
1349                 op |= 002;
1350         if (ctl_perm(table, op))
1351                 return -EPERM;
1352
1353         if (table->strategy) {
1354                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1355                                      newval, newlen, context);
1356                 if (rc < 0)
1357                         return rc;
1358                 if (rc > 0)
1359                         return 0;
1360         }
1361
1362         /* If there is no strategy routine, or if the strategy returns
1363          * zero, proceed with automatic r/w */
1364         if (table->data && table->maxlen) {
1365                 if (oldval && oldlenp) {
1366                         if (get_user(len, oldlenp))
1367                                 return -EFAULT;
1368                         if (len) {
1369                                 if (len > table->maxlen)
1370                                         len = table->maxlen;
1371                                 if(copy_to_user(oldval, table->data, len))
1372                                         return -EFAULT;
1373                                 if(put_user(len, oldlenp))
1374                                         return -EFAULT;
1375                         }
1376                 }
1377                 if (newval && newlen) {
1378                         len = newlen;
1379                         if (len > table->maxlen)
1380                                 len = table->maxlen;
1381                         if(copy_from_user(table->data, newval, len))
1382                                 return -EFAULT;
1383                 }
1384         }
1385         return 0;
1386 }
1387 #endif /* CONFIG_SYSCTL_SYSCALL */
1388
1389 /**
1390  * register_sysctl_table - register a sysctl hierarchy
1391  * @table: the top-level table structure
1392  * @insert_at_head: whether the entry should be inserted in front or at the end
1393  *
1394  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1395  * array. An entry with a ctl_name of 0 terminates the table.
1396  *
1397  * The members of the &ctl_table structure are used as follows:
1398  *
1399  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1400  *            must be unique within that level of sysctl
1401  *
1402  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1403  *            enter a sysctl file
1404  *
1405  * data - a pointer to data for use by proc_handler
1406  *
1407  * maxlen - the maximum size in bytes of the data
1408  *
1409  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1410  *
1411  * child - a pointer to the child sysctl table if this entry is a directory, or
1412  *         %NULL.
1413  *
1414  * proc_handler - the text handler routine (described below)
1415  *
1416  * strategy - the strategy routine (described below)
1417  *
1418  * de - for internal use by the sysctl routines
1419  *
1420  * extra1, extra2 - extra pointers usable by the proc handler routines
1421  *
1422  * Leaf nodes in the sysctl tree will be represented by a single file
1423  * under /proc; non-leaf nodes will be represented by directories.
1424  *
1425  * sysctl(2) can automatically manage read and write requests through
1426  * the sysctl table.  The data and maxlen fields of the ctl_table
1427  * struct enable minimal validation of the values being written to be
1428  * performed, and the mode field allows minimal authentication.
1429  *
1430  * More sophisticated management can be enabled by the provision of a
1431  * strategy routine with the table entry.  This will be called before
1432  * any automatic read or write of the data is performed.
1433  *
1434  * The strategy routine may return
1435  *
1436  * < 0 - Error occurred (error is passed to user process)
1437  *
1438  * 0   - OK - proceed with automatic read or write.
1439  *
1440  * > 0 - OK - read or write has been done by the strategy routine, so
1441  *       return immediately.
1442  *
1443  * There must be a proc_handler routine for any terminal nodes
1444  * mirrored under /proc/sys (non-terminals are handled by a built-in
1445  * directory handler).  Several default handlers are available to
1446  * cover common cases -
1447  *
1448  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1449  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1450  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1451  *
1452  * It is the handler's job to read the input buffer from user memory
1453  * and process it. The handler should return 0 on success.
1454  *
1455  * This routine returns %NULL on a failure to register, and a pointer
1456  * to the table header on success.
1457  */
1458 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1459                                                int insert_at_head)
1460 {
1461         struct ctl_table_header *tmp;
1462         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1463         if (!tmp)
1464                 return NULL;
1465         tmp->ctl_table = table;
1466         INIT_LIST_HEAD(&tmp->ctl_entry);
1467         tmp->used = 0;
1468         tmp->unregistering = NULL;
1469         spin_lock(&sysctl_lock);
1470         if (insert_at_head)
1471                 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1472         else
1473                 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1474         spin_unlock(&sysctl_lock);
1475 #ifdef CONFIG_PROC_SYSCTL
1476         register_proc_table(table, proc_sys_root, tmp);
1477 #endif
1478         return tmp;
1479 }
1480
1481 /**
1482  * unregister_sysctl_table - unregister a sysctl table hierarchy
1483  * @header: the header returned from register_sysctl_table
1484  *
1485  * Unregisters the sysctl table and all children. proc entries may not
1486  * actually be removed until they are no longer used by anyone.
1487  */
1488 void unregister_sysctl_table(struct ctl_table_header * header)
1489 {
1490         might_sleep();
1491         spin_lock(&sysctl_lock);
1492         start_unregistering(header);
1493 #ifdef CONFIG_PROC_SYSCTL
1494         unregister_proc_table(header->ctl_table, proc_sys_root);
1495 #endif
1496         spin_unlock(&sysctl_lock);
1497         kfree(header);
1498 }
1499
1500 #else /* !CONFIG_SYSCTL */
1501 struct ctl_table_header * register_sysctl_table(ctl_table * table,
1502                                                 int insert_at_head)
1503 {
1504         return NULL;
1505 }
1506
1507 void unregister_sysctl_table(struct ctl_table_header * table)
1508 {
1509 }
1510
1511 #endif /* CONFIG_SYSCTL */
1512
1513 /*
1514  * /proc/sys support
1515  */
1516
1517 #ifdef CONFIG_PROC_SYSCTL
1518
1519 /* Scan the sysctl entries in table and add them all into /proc */
1520 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1521 {
1522         struct proc_dir_entry *de;
1523         int len;
1524         mode_t mode;
1525
1526         for (; table->ctl_name || table->procname; table++) {
1527                 /* Can't do anything without a proc name. */
1528                 if (!table->procname)
1529                         continue;
1530                 /* Maybe we can't do anything with it... */
1531                 if (!table->proc_handler && !table->child) {
1532                         printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1533                                 table->procname);
1534                         continue;
1535                 }
1536
1537                 len = strlen(table->procname);
1538                 mode = table->mode;
1539
1540                 de = NULL;
1541                 if (table->proc_handler)
1542                         mode |= S_IFREG;
1543                 else {
1544                         mode |= S_IFDIR;
1545                         for (de = root->subdir; de; de = de->next) {
1546                                 if (proc_match(len, table->procname, de))
1547                                         break;
1548                         }
1549                         /* If the subdir exists already, de is non-NULL */
1550                 }
1551
1552                 if (!de) {
1553                         de = create_proc_entry(table->procname, mode, root);
1554                         if (!de)
1555                                 continue;
1556                         de->set = set;
1557                         de->data = (void *) table;
1558                         if (table->proc_handler)
1559                                 de->proc_fops = &proc_sys_file_operations;
1560                 }
1561                 table->de = de;
1562                 if (de->mode & S_IFDIR)
1563                         register_proc_table(table->child, de, set);
1564         }
1565 }
1566
1567 /*
1568  * Unregister a /proc sysctl table and any subdirectories.
1569  */
1570 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1571 {
1572         struct proc_dir_entry *de;
1573         for (; table->ctl_name || table->procname; table++) {
1574                 if (!(de = table->de))
1575                         continue;
1576                 if (de->mode & S_IFDIR) {
1577                         if (!table->child) {
1578                                 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1579                                 continue;
1580                         }
1581                         unregister_proc_table(table->child, de);
1582
1583                         /* Don't unregister directories which still have entries.. */
1584                         if (de->subdir)
1585                                 continue;
1586                 }
1587
1588                 /*
1589                  * In any case, mark the entry as goner; we'll keep it
1590                  * around if it's busy, but we'll know to do nothing with
1591                  * its fields.  We are under sysctl_lock here.
1592                  */
1593                 de->data = NULL;
1594
1595                 /* Don't unregister proc entries that are still being used.. */
1596                 if (atomic_read(&de->count))
1597                         continue;
1598
1599                 table->de = NULL;
1600                 remove_proc_entry(table->procname, root);
1601         }
1602 }
1603
1604 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1605                           size_t count, loff_t *ppos)
1606 {
1607         int op;
1608         struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
1609         struct ctl_table *table;
1610         size_t res;
1611         ssize_t error = -ENOTDIR;
1612
1613         spin_lock(&sysctl_lock);
1614         if (de && de->data && use_table(de->set)) {
1615                 /*
1616                  * at that point we know that sysctl was not unregistered
1617                  * and won't be until we finish
1618                  */
1619                 spin_unlock(&sysctl_lock);
1620                 table = (struct ctl_table *) de->data;
1621                 if (!table || !table->proc_handler)
1622                         goto out;
1623                 error = -EPERM;
1624                 op = (write ? 002 : 004);
1625                 if (ctl_perm(table, op))
1626                         goto out;
1627
1628                 /* careful: calling conventions are nasty here */
1629                 res = count;
1630                 error = (*table->proc_handler)(table, write, file,
1631                                                 buf, &res, ppos);
1632                 if (!error)
1633                         error = res;
1634         out:
1635                 spin_lock(&sysctl_lock);
1636                 unuse_table(de->set);
1637         }
1638         spin_unlock(&sysctl_lock);
1639         return error;
1640 }
1641
1642 static int proc_opensys(struct inode *inode, struct file *file)
1643 {
1644         if (file->f_mode & FMODE_WRITE) {
1645                 /*
1646                  * sysctl entries that are not writable,
1647                  * are _NOT_ writable, capabilities or not.
1648                  */
1649                 if (!(inode->i_mode & S_IWUSR))
1650                         return -EPERM;
1651         }
1652
1653         return 0;
1654 }
1655
1656 static ssize_t proc_readsys(struct file * file, char __user * buf,
1657                             size_t count, loff_t *ppos)
1658 {
1659         return do_rw_proc(0, file, buf, count, ppos);
1660 }
1661
1662 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1663                              size_t count, loff_t *ppos)
1664 {
1665         return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1666 }
1667
1668 static int _proc_do_string(void* data, int maxlen, int write,
1669                            struct file *filp, void __user *buffer,
1670                            size_t *lenp, loff_t *ppos)
1671 {
1672         size_t len;
1673         char __user *p;
1674         char c;
1675
1676         if (!data || !maxlen || !*lenp ||
1677             (*ppos && !write)) {
1678                 *lenp = 0;
1679                 return 0;
1680         }
1681
1682         if (write) {
1683                 len = 0;
1684                 p = buffer;
1685                 while (len < *lenp) {
1686                         if (get_user(c, p++))
1687                                 return -EFAULT;
1688                         if (c == 0 || c == '\n')
1689                                 break;
1690                         len++;
1691                 }
1692                 if (len >= maxlen)
1693                         len = maxlen-1;
1694                 if(copy_from_user(data, buffer, len))
1695                         return -EFAULT;
1696                 ((char *) data)[len] = 0;
1697                 *ppos += *lenp;
1698         } else {
1699                 len = strlen(data);
1700                 if (len > maxlen)
1701                         len = maxlen;
1702                 if (len > *lenp)
1703                         len = *lenp;
1704                 if (len)
1705                         if(copy_to_user(buffer, data, len))
1706                                 return -EFAULT;
1707                 if (len < *lenp) {
1708                         if(put_user('\n', ((char __user *) buffer) + len))
1709                                 return -EFAULT;
1710                         len++;
1711                 }
1712                 *lenp = len;
1713                 *ppos += len;
1714         }
1715         return 0;
1716 }
1717
1718 /**
1719  * proc_dostring - read a string sysctl
1720  * @table: the sysctl table
1721  * @write: %TRUE if this is a write to the sysctl file
1722  * @filp: the file structure
1723  * @buffer: the user buffer
1724  * @lenp: the size of the user buffer
1725  * @ppos: file position
1726  *
1727  * Reads/writes a string from/to the user buffer. If the kernel
1728  * buffer provided is not large enough to hold the string, the
1729  * string is truncated. The copied string is %NULL-terminated.
1730  * If the string is being read by the user process, it is copied
1731  * and a newline '\n' is added. It is truncated if the buffer is
1732  * not large enough.
1733  *
1734  * Returns 0 on success.
1735  */
1736 int proc_dostring(ctl_table *table, int write, struct file *filp,
1737                   void __user *buffer, size_t *lenp, loff_t *ppos)
1738 {
1739         return _proc_do_string(table->data, table->maxlen, write, filp,
1740                                buffer, lenp, ppos);
1741 }
1742
1743 /*
1744  *      Special case of dostring for the UTS structure. This has locks
1745  *      to observe. Should this be in kernel/sys.c ????
1746  */
1747
1748 #ifndef CONFIG_UTS_NS
1749 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
1750                   void __user *buffer, size_t *lenp, loff_t *ppos)
1751 {
1752         int r;
1753
1754         if (!write) {
1755                 down_read(&uts_sem);
1756                 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1757                 up_read(&uts_sem);
1758         } else {
1759                 down_write(&uts_sem);
1760                 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1761                 up_write(&uts_sem);
1762         }
1763         return r;
1764 }
1765 #else /* !CONFIG_UTS_NS */
1766 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
1767                   void __user *buffer, size_t *lenp, loff_t *ppos)
1768 {
1769         int r;
1770         struct uts_namespace* uts_ns = current->nsproxy->uts_ns;
1771         char* which;
1772
1773         switch (table->ctl_name) {
1774         case KERN_OSTYPE:
1775                 which = uts_ns->name.sysname;
1776                 break;
1777         case KERN_NODENAME:
1778                 which = uts_ns->name.nodename;
1779                 break;
1780         case KERN_OSRELEASE:
1781                 which = uts_ns->name.release;
1782                 break;
1783         case KERN_VERSION:
1784                 which = uts_ns->name.version;
1785                 break;
1786         case KERN_DOMAINNAME:
1787                 which = uts_ns->name.domainname;
1788                 break;
1789         default:
1790                 r = -EINVAL;
1791                 goto out;
1792         }
1793
1794         if (!write) {
1795                 down_read(&uts_sem);
1796                 r=_proc_do_string(which,table->maxlen,0,filp,buffer,lenp, ppos);
1797                 up_read(&uts_sem);
1798         } else {
1799                 down_write(&uts_sem);
1800                 r=_proc_do_string(which,table->maxlen,1,filp,buffer,lenp, ppos);
1801                 up_write(&uts_sem);
1802         }
1803  out:
1804         return r;
1805 }
1806 #endif /* !CONFIG_UTS_NS */
1807
1808 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1809                                  int *valp,
1810                                  int write, void *data)
1811 {
1812         if (write) {
1813                 *valp = *negp ? -*lvalp : *lvalp;
1814         } else {
1815                 int val = *valp;
1816                 if (val < 0) {
1817                         *negp = -1;
1818                         *lvalp = (unsigned long)-val;
1819                 } else {
1820                         *negp = 0;
1821                         *lvalp = (unsigned long)val;
1822                 }
1823         }
1824         return 0;
1825 }
1826
1827 static int __do_proc_dointvec(void *tbl_data, ctl_table *table,
1828                   int write, struct file *filp, void __user *buffer,
1829                   size_t *lenp, loff_t *ppos,
1830                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1831                               int write, void *data),
1832                   void *data)
1833 {
1834 #define TMPBUFLEN 21
1835         int *i, vleft, first=1, neg, val;
1836         unsigned long lval;
1837         size_t left, len;
1838
1839         char buf[TMPBUFLEN], *p;
1840         char __user *s = buffer;
1841
1842         if (!tbl_data || !table->maxlen || !*lenp ||
1843             (*ppos && !write)) {
1844                 *lenp = 0;
1845                 return 0;
1846         }
1847
1848         i = (int *) tbl_data;
1849         vleft = table->maxlen / sizeof(*i);
1850         left = *lenp;
1851
1852         if (!conv)
1853                 conv = do_proc_dointvec_conv;
1854
1855         for (; left && vleft--; i++, first=0) {
1856                 if (write) {
1857                         while (left) {
1858                                 char c;
1859                                 if (get_user(c, s))
1860                                         return -EFAULT;
1861                                 if (!isspace(c))
1862                                         break;
1863                                 left--;
1864                                 s++;
1865                         }
1866                         if (!left)
1867                                 break;
1868                         neg = 0;
1869                         len = left;
1870                         if (len > sizeof(buf) - 1)
1871                                 len = sizeof(buf) - 1;
1872                         if (copy_from_user(buf, s, len))
1873                                 return -EFAULT;
1874                         buf[len] = 0;
1875                         p = buf;
1876                         if (*p == '-' && left > 1) {
1877                                 neg = 1;
1878                                 p++;
1879                         }
1880                         if (*p < '0' || *p > '9')
1881                                 break;
1882
1883                         lval = simple_strtoul(p, &p, 0);
1884
1885                         len = p-buf;
1886                         if ((len < left) && *p && !isspace(*p))
1887                                 break;
1888                         if (neg)
1889                                 val = -val;
1890                         s += len;
1891                         left -= len;
1892
1893                         if (conv(&neg, &lval, i, 1, data))
1894                                 break;
1895                 } else {
1896                         p = buf;
1897                         if (!first)
1898                                 *p++ = '\t';
1899
1900                         if (conv(&neg, &lval, i, 0, data))
1901                                 break;
1902
1903                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1904                         len = strlen(buf);
1905                         if (len > left)
1906                                 len = left;
1907                         if(copy_to_user(s, buf, len))
1908                                 return -EFAULT;
1909                         left -= len;
1910                         s += len;
1911                 }
1912         }
1913
1914         if (!write && !first && left) {
1915                 if(put_user('\n', s))
1916                         return -EFAULT;
1917                 left--, s++;
1918         }
1919         if (write) {
1920                 while (left) {
1921                         char c;
1922                         if (get_user(c, s++))
1923                                 return -EFAULT;
1924                         if (!isspace(c))
1925                                 break;
1926                         left--;
1927                 }
1928         }
1929         if (write && first)
1930                 return -EINVAL;
1931         *lenp -= left;
1932         *ppos += *lenp;
1933         return 0;
1934 #undef TMPBUFLEN
1935 }
1936
1937 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1938                   void __user *buffer, size_t *lenp, loff_t *ppos,
1939                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1940                               int write, void *data),
1941                   void *data)
1942 {
1943         return __do_proc_dointvec(table->data, table, write, filp,
1944                         buffer, lenp, ppos, conv, data);
1945 }
1946
1947 /**
1948  * proc_dointvec - read a vector of integers
1949  * @table: the sysctl table
1950  * @write: %TRUE if this is a write to the sysctl file
1951  * @filp: the file structure
1952  * @buffer: the user buffer
1953  * @lenp: the size of the user buffer
1954  * @ppos: file position
1955  *
1956  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1957  * values from/to the user buffer, treated as an ASCII string.
1958  *
1959  * Returns 0 on success.
1960  */
1961 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1962                      void __user *buffer, size_t *lenp, loff_t *ppos)
1963 {
1964     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1965                             NULL,NULL);
1966 }
1967
1968 #define OP_SET  0
1969 #define OP_AND  1
1970 #define OP_OR   2
1971 #define OP_MAX  3
1972 #define OP_MIN  4
1973
1974 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1975                                       int *valp,
1976                                       int write, void *data)
1977 {
1978         int op = *(int *)data;
1979         if (write) {
1980                 int val = *negp ? -*lvalp : *lvalp;
1981                 switch(op) {
1982                 case OP_SET:    *valp = val; break;
1983                 case OP_AND:    *valp &= val; break;
1984                 case OP_OR:     *valp |= val; break;
1985                 case OP_MAX:    if(*valp < val)
1986                                         *valp = val;
1987                                 break;
1988                 case OP_MIN:    if(*valp > val)
1989                                 *valp = val;
1990                                 break;
1991                 }
1992         } else {
1993                 int val = *valp;
1994                 if (val < 0) {
1995                         *negp = -1;
1996                         *lvalp = (unsigned long)-val;
1997                 } else {
1998                         *negp = 0;
1999                         *lvalp = (unsigned long)val;
2000                 }
2001         }
2002         return 0;
2003 }
2004
2005 /*
2006  *      init may raise the set.
2007  */
2008
2009 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2010                         void __user *buffer, size_t *lenp, loff_t *ppos)
2011 {
2012         int op;
2013
2014         if (!capable(CAP_SYS_MODULE)) {
2015                 return -EPERM;
2016         }
2017
2018         op = is_init(current) ? OP_SET : OP_AND;
2019         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2020                                 do_proc_dointvec_bset_conv,&op);
2021 }
2022
2023 struct do_proc_dointvec_minmax_conv_param {
2024         int *min;
2025         int *max;
2026 };
2027
2028 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2029                                         int *valp,
2030                                         int write, void *data)
2031 {
2032         struct do_proc_dointvec_minmax_conv_param *param = data;
2033         if (write) {
2034                 int val = *negp ? -*lvalp : *lvalp;
2035                 if ((param->min && *param->min > val) ||
2036                     (param->max && *param->max < val))
2037                         return -EINVAL;
2038                 *valp = val;
2039         } else {
2040                 int val = *valp;
2041                 if (val < 0) {
2042                         *negp = -1;
2043                         *lvalp = (unsigned long)-val;
2044                 } else {
2045                         *negp = 0;
2046                         *lvalp = (unsigned long)val;
2047                 }
2048         }
2049         return 0;
2050 }
2051
2052 /**
2053  * proc_dointvec_minmax - read a vector of integers with min/max values
2054  * @table: the sysctl table
2055  * @write: %TRUE if this is a write to the sysctl file
2056  * @filp: the file structure
2057  * @buffer: the user buffer
2058  * @lenp: the size of the user buffer
2059  * @ppos: file position
2060  *
2061  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2062  * values from/to the user buffer, treated as an ASCII string.
2063  *
2064  * This routine will ensure the values are within the range specified by
2065  * table->extra1 (min) and table->extra2 (max).
2066  *
2067  * Returns 0 on success.
2068  */
2069 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2070                   void __user *buffer, size_t *lenp, loff_t *ppos)
2071 {
2072         struct do_proc_dointvec_minmax_conv_param param = {
2073                 .min = (int *) table->extra1,
2074                 .max = (int *) table->extra2,
2075         };
2076         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2077                                 do_proc_dointvec_minmax_conv, &param);
2078 }
2079
2080 static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write,
2081                                      struct file *filp,
2082                                      void __user *buffer,
2083                                      size_t *lenp, loff_t *ppos,
2084                                      unsigned long convmul,
2085                                      unsigned long convdiv)
2086 {
2087 #define TMPBUFLEN 21
2088         unsigned long *i, *min, *max, val;
2089         int vleft, first=1, neg;
2090         size_t len, left;
2091         char buf[TMPBUFLEN], *p;
2092         char __user *s = buffer;
2093
2094         if (!data || !table->maxlen || !*lenp ||
2095             (*ppos && !write)) {
2096                 *lenp = 0;
2097                 return 0;
2098         }
2099
2100         i = (unsigned long *) data;
2101         min = (unsigned long *) table->extra1;
2102         max = (unsigned long *) table->extra2;
2103         vleft = table->maxlen / sizeof(unsigned long);
2104         left = *lenp;
2105
2106         for (; left && vleft--; i++, min++, max++, first=0) {
2107                 if (write) {
2108                         while (left) {
2109                                 char c;
2110                                 if (get_user(c, s))
2111                                         return -EFAULT;
2112                                 if (!isspace(c))
2113                                         break;
2114                                 left--;
2115                                 s++;
2116                         }
2117                         if (!left)
2118                                 break;
2119                         neg = 0;
2120                         len = left;
2121                         if (len > TMPBUFLEN-1)
2122                                 len = TMPBUFLEN-1;
2123                         if (copy_from_user(buf, s, len))
2124                                 return -EFAULT;
2125                         buf[len] = 0;
2126                         p = buf;
2127                         if (*p == '-' && left > 1) {
2128                                 neg = 1;
2129                                 p++;
2130                         }
2131                         if (*p < '0' || *p > '9')
2132                                 break;
2133                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2134                         len = p-buf;
2135                         if ((len < left) && *p && !isspace(*p))
2136                                 break;
2137                         if (neg)
2138                                 val = -val;
2139                         s += len;
2140                         left -= len;
2141
2142                         if(neg)
2143                                 continue;
2144                         if ((min && val < *min) || (max && val > *max))
2145                                 continue;
2146                         *i = val;
2147                 } else {
2148                         p = buf;
2149                         if (!first)
2150                                 *p++ = '\t';
2151                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2152                         len = strlen(buf);
2153                         if (len > left)
2154                                 len = left;
2155                         if(copy_to_user(s, buf, len))
2156                                 return -EFAULT;
2157                         left -= len;
2158                         s += len;
2159                 }
2160         }
2161
2162         if (!write && !first && left) {
2163                 if(put_user('\n', s))
2164                         return -EFAULT;
2165                 left--, s++;
2166         }
2167         if (write) {
2168                 while (left) {
2169                         char c;
2170                         if (get_user(c, s++))
2171                                 return -EFAULT;
2172                         if (!isspace(c))
2173                                 break;
2174                         left--;
2175                 }
2176         }
2177         if (write && first)
2178                 return -EINVAL;
2179         *lenp -= left;
2180         *ppos += *lenp;
2181         return 0;
2182 #undef TMPBUFLEN
2183 }
2184
2185 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
2186                                      struct file *filp,
2187                                      void __user *buffer,
2188                                      size_t *lenp, loff_t *ppos,
2189                                      unsigned long convmul,
2190                                      unsigned long convdiv)
2191 {
2192         return __do_proc_doulongvec_minmax(table->data, table, write,
2193                         filp, buffer, lenp, ppos, convmul, convdiv);
2194 }
2195
2196 /**
2197  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2198  * @table: the sysctl table
2199  * @write: %TRUE if this is a write to the sysctl file
2200  * @filp: the file structure
2201  * @buffer: the user buffer
2202  * @lenp: the size of the user buffer
2203  * @ppos: file position
2204  *
2205  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2206  * values from/to the user buffer, treated as an ASCII string.
2207  *
2208  * This routine will ensure the values are within the range specified by
2209  * table->extra1 (min) and table->extra2 (max).
2210  *
2211  * Returns 0 on success.
2212  */
2213 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2214                            void __user *buffer, size_t *lenp, loff_t *ppos)
2215 {
2216     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2217 }
2218
2219 /**
2220  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2221  * @table: the sysctl table
2222  * @write: %TRUE if this is a write to the sysctl file
2223  * @filp: the file structure
2224  * @buffer: the user buffer
2225  * @lenp: the size of the user buffer
2226  * @ppos: file position
2227  *
2228  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2229  * values from/to the user buffer, treated as an ASCII string. The values
2230  * are treated as milliseconds, and converted to jiffies when they are stored.
2231  *
2232  * This routine will ensure the values are within the range specified by
2233  * table->extra1 (min) and table->extra2 (max).
2234  *
2235  * Returns 0 on success.
2236  */
2237 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2238                                       struct file *filp,
2239                                       void __user *buffer,
2240                                       size_t *lenp, loff_t *ppos)
2241 {
2242     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2243                                      lenp, ppos, HZ, 1000l);
2244 }
2245
2246
2247 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2248                                          int *valp,
2249                                          int write, void *data)
2250 {
2251         if (write) {
2252                 if (*lvalp > LONG_MAX / HZ)
2253                         return 1;
2254                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2255         } else {
2256                 int val = *valp;
2257                 unsigned long lval;
2258                 if (val < 0) {
2259                         *negp = -1;
2260                         lval = (unsigned long)-val;
2261                 } else {
2262                         *negp = 0;
2263                         lval = (unsigned long)val;
2264                 }
2265                 *lvalp = lval / HZ;
2266         }
2267         return 0;
2268 }
2269
2270 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2271                                                 int *valp,
2272                                                 int write, void *data)
2273 {
2274         if (write) {
2275                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2276                         return 1;
2277                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2278         } else {
2279                 int val = *valp;
2280                 unsigned long lval;
2281                 if (val < 0) {
2282                         *negp = -1;
2283                         lval = (unsigned long)-val;
2284                 } else {
2285                         *negp = 0;
2286                         lval = (unsigned long)val;
2287                 }
2288                 *lvalp = jiffies_to_clock_t(lval);
2289         }
2290         return 0;
2291 }
2292
2293 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2294                                             int *valp,
2295                                             int write, void *data)
2296 {
2297         if (write) {
2298                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2299         } else {
2300                 int val = *valp;
2301                 unsigned long lval;
2302                 if (val < 0) {
2303                         *negp = -1;
2304                         lval = (unsigned long)-val;
2305                 } else {
2306                         *negp = 0;
2307                         lval = (unsigned long)val;
2308                 }
2309                 *lvalp = jiffies_to_msecs(lval);
2310         }
2311         return 0;
2312 }
2313
2314 /**
2315  * proc_dointvec_jiffies - read a vector of integers as seconds
2316  * @table: the sysctl table
2317  * @write: %TRUE if this is a write to the sysctl file
2318  * @filp: the file structure
2319  * @buffer: the user buffer
2320  * @lenp: the size of the user buffer
2321  * @ppos: file position
2322  *
2323  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2324  * values from/to the user buffer, treated as an ASCII string.
2325  * The values read are assumed to be in seconds, and are converted into
2326  * jiffies.
2327  *
2328  * Returns 0 on success.
2329  */
2330 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2331                           void __user *buffer, size_t *lenp, loff_t *ppos)
2332 {
2333     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2334                             do_proc_dointvec_jiffies_conv,NULL);
2335 }
2336
2337 /**
2338  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2339  * @table: the sysctl table
2340  * @write: %TRUE if this is a write to the sysctl file
2341  * @filp: the file structure
2342  * @buffer: the user buffer
2343  * @lenp: the size of the user buffer
2344  * @ppos: pointer to the file position
2345  *
2346  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2347  * values from/to the user buffer, treated as an ASCII string.
2348  * The values read are assumed to be in 1/USER_HZ seconds, and
2349  * are converted into jiffies.
2350  *
2351  * Returns 0 on success.
2352  */
2353 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2354                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2355 {
2356     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2357                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2358 }
2359
2360 /**
2361  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2362  * @table: the sysctl table
2363  * @write: %TRUE if this is a write to the sysctl file
2364  * @filp: the file structure
2365  * @buffer: the user buffer
2366  * @lenp: the size of the user buffer
2367  * @ppos: file position
2368  * @ppos: the current position in the file
2369  *
2370  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2371  * values from/to the user buffer, treated as an ASCII string.
2372  * The values read are assumed to be in 1/1000 seconds, and
2373  * are converted into jiffies.
2374  *
2375  * Returns 0 on success.
2376  */
2377 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2378                              void __user *buffer, size_t *lenp, loff_t *ppos)
2379 {
2380         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2381                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2382 }
2383
2384 #ifdef CONFIG_SYSVIPC
2385 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2386                 void __user *buffer, size_t *lenp, loff_t *ppos)
2387 {
2388         void *data;
2389         struct ipc_namespace *ns;
2390
2391         ns = current->nsproxy->ipc_ns;
2392
2393         switch (table->ctl_name) {
2394         case KERN_SHMMAX:
2395                 data = &ns->shm_ctlmax;
2396                 goto proc_minmax;
2397         case KERN_SHMALL:
2398                 data = &ns->shm_ctlall;
2399                 goto proc_minmax;
2400         case KERN_SHMMNI:
2401                 data = &ns->shm_ctlmni;
2402                 break;
2403         case KERN_MSGMAX:
2404                 data = &ns->msg_ctlmax;
2405                 break;
2406         case KERN_MSGMNI:
2407                 data = &ns->msg_ctlmni;
2408                 break;
2409         case KERN_MSGMNB:
2410                 data = &ns->msg_ctlmnb;
2411                 break;
2412         case KERN_SEM:
2413                 data = &ns->sem_ctls;
2414                 break;
2415         default:
2416                 return -EINVAL;
2417         }
2418
2419         return __do_proc_dointvec(data, table, write, filp, buffer,
2420                         lenp, ppos, NULL, NULL);
2421 proc_minmax:
2422         return __do_proc_doulongvec_minmax(data, table, write, filp, buffer,
2423                         lenp, ppos, 1l, 1l);
2424 }
2425 #endif
2426
2427 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
2428                            void __user *buffer, size_t *lenp, loff_t *ppos)
2429 {
2430         struct pid *new_pid;
2431         pid_t tmp;
2432         int r;
2433
2434         tmp = pid_nr(cad_pid);
2435
2436         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2437                                lenp, ppos, NULL, NULL);
2438         if (r || !write)
2439                 return r;
2440
2441         new_pid = find_get_pid(tmp);
2442         if (!new_pid)
2443                 return -ESRCH;
2444
2445         put_pid(xchg(&cad_pid, new_pid));
2446         return 0;
2447 }
2448
2449 #else /* CONFIG_PROC_FS */
2450
2451 int proc_dostring(ctl_table *table, int write, struct file *filp,
2452                   void __user *buffer, size_t *lenp, loff_t *ppos)
2453 {
2454         return -ENOSYS;
2455 }
2456
2457 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
2458                 void __user *buffer, size_t *lenp, loff_t *ppos)
2459 {
2460         return -ENOSYS;
2461 }
2462
2463 #ifdef CONFIG_SYSVIPC
2464 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2465                 void __user *buffer, size_t *lenp, loff_t *ppos)
2466 {
2467         return -ENOSYS;
2468 }
2469 #endif
2470
2471 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2472                   void __user *buffer, size_t *lenp, loff_t *ppos)
2473 {
2474         return -ENOSYS;
2475 }
2476
2477 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2478                         void __user *buffer, size_t *lenp, loff_t *ppos)
2479 {
2480         return -ENOSYS;
2481 }
2482
2483 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2484                     void __user *buffer, size_t *lenp, loff_t *ppos)
2485 {
2486         return -ENOSYS;
2487 }
2488
2489 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2490                     void __user *buffer, size_t *lenp, loff_t *ppos)
2491 {
2492         return -ENOSYS;
2493 }
2494
2495 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2496                     void __user *buffer, size_t *lenp, loff_t *ppos)
2497 {
2498         return -ENOSYS;
2499 }
2500
2501 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2502                              void __user *buffer, size_t *lenp, loff_t *ppos)
2503 {
2504         return -ENOSYS;
2505 }
2506
2507 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2508                     void __user *buffer, size_t *lenp, loff_t *ppos)
2509 {
2510         return -ENOSYS;
2511 }
2512
2513 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2514                                       struct file *filp,
2515                                       void __user *buffer,
2516                                       size_t *lenp, loff_t *ppos)
2517 {
2518     return -ENOSYS;
2519 }
2520
2521
2522 #endif /* CONFIG_PROC_FS */
2523
2524
2525 #ifdef CONFIG_SYSCTL_SYSCALL
2526 /*
2527  * General sysctl support routines
2528  */
2529
2530 /* The generic string strategy routine: */
2531 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2532                   void __user *oldval, size_t __user *oldlenp,
2533                   void __user *newval, size_t newlen, void **context)
2534 {
2535         if (!table->data || !table->maxlen)
2536                 return -ENOTDIR;
2537
2538         if (oldval && oldlenp) {
2539                 size_t bufsize;
2540                 if (get_user(bufsize, oldlenp))
2541                         return -EFAULT;
2542                 if (bufsize) {
2543                         size_t len = strlen(table->data), copied;
2544
2545                         /* This shouldn't trigger for a well-formed sysctl */
2546                         if (len > table->maxlen)
2547                                 len = table->maxlen;
2548
2549                         /* Copy up to a max of bufsize-1 bytes of the string */
2550                         copied = (len >= bufsize) ? bufsize - 1 : len;
2551
2552                         if (copy_to_user(oldval, table->data, copied) ||
2553                             put_user(0, (char __user *)(oldval + copied)))
2554                                 return -EFAULT;
2555                         if (put_user(len, oldlenp))
2556                                 return -EFAULT;
2557                 }
2558         }
2559         if (newval && newlen) {
2560                 size_t len = newlen;
2561                 if (len > table->maxlen)
2562                         len = table->maxlen;
2563                 if(copy_from_user(table->data, newval, len))
2564                         return -EFAULT;
2565                 if (len == table->maxlen)
2566                         len--;
2567                 ((char *) table->data)[len] = 0;
2568         }
2569         return 1;
2570 }
2571
2572 /*
2573  * This function makes sure that all of the integers in the vector
2574  * are between the minimum and maximum values given in the arrays
2575  * table->extra1 and table->extra2, respectively.
2576  */
2577 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2578                 void __user *oldval, size_t __user *oldlenp,
2579                 void __user *newval, size_t newlen, void **context)
2580 {
2581
2582         if (newval && newlen) {
2583                 int __user *vec = (int __user *) newval;
2584                 int *min = (int *) table->extra1;
2585                 int *max = (int *) table->extra2;
2586                 size_t length;
2587                 int i;
2588
2589                 if (newlen % sizeof(int) != 0)
2590                         return -EINVAL;
2591
2592                 if (!table->extra1 && !table->extra2)
2593                         return 0;
2594
2595                 if (newlen > table->maxlen)
2596                         newlen = table->maxlen;
2597                 length = newlen / sizeof(int);
2598
2599                 for (i = 0; i < length; i++) {
2600                         int value;
2601                         if (get_user(value, vec + i))
2602                                 return -EFAULT;
2603                         if (min && value < min[i])
2604                                 return -EINVAL;
2605                         if (max && value > max[i])
2606                                 return -EINVAL;
2607                 }
2608         }
2609         return 0;
2610 }
2611
2612 /* Strategy function to convert jiffies to seconds */
2613 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2614                 void __user *oldval, size_t __user *oldlenp,
2615                 void __user *newval, size_t newlen, void **context)
2616 {
2617         if (oldval) {
2618                 size_t olen;
2619                 if (oldlenp) {
2620                         if (get_user(olen, oldlenp))
2621                                 return -EFAULT;
2622                         if (olen!=sizeof(int))
2623                                 return -EINVAL;
2624                 }
2625                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2626                     (oldlenp && put_user(sizeof(int),oldlenp)))
2627                         return -EFAULT;
2628         }
2629         if (newval && newlen) {
2630                 int new;
2631                 if (newlen != sizeof(int))
2632                         return -EINVAL;
2633                 if (get_user(new, (int __user *)newval))
2634                         return -EFAULT;
2635                 *(int *)(table->data) = new*HZ;
2636         }
2637         return 1;
2638 }
2639
2640 /* Strategy function to convert jiffies to seconds */
2641 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2642                 void __user *oldval, size_t __user *oldlenp,
2643                 void __user *newval, size_t newlen, void **context)
2644 {
2645         if (oldval) {
2646                 size_t olen;
2647                 if (oldlenp) {
2648                         if (get_user(olen, oldlenp))
2649                                 return -EFAULT;
2650                         if (olen!=sizeof(int))
2651                                 return -EINVAL;
2652                 }
2653                 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2654                     (oldlenp && put_user(sizeof(int),oldlenp)))
2655                         return -EFAULT;
2656         }
2657         if (newval && newlen) {
2658                 int new;
2659                 if (newlen != sizeof(int))
2660                         return -EINVAL;
2661                 if (get_user(new, (int __user *)newval))
2662                         return -EFAULT;
2663                 *(int *)(table->data) = msecs_to_jiffies(new);
2664         }
2665         return 1;
2666 }
2667
2668 #else /* CONFIG_SYSCTL_SYSCALL */
2669
2670
2671 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2672 {
2673         static int msg_count;
2674         struct __sysctl_args tmp;
2675         int name[CTL_MAXNAME];
2676         int i;
2677
2678         /* Read in the sysctl name for better debug message logging */
2679         if (copy_from_user(&tmp, args, sizeof(tmp)))
2680                 return -EFAULT;
2681         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2682                 return -ENOTDIR;
2683         for (i = 0; i < tmp.nlen; i++)
2684                 if (get_user(name[i], tmp.name + i))
2685                         return -EFAULT;
2686
2687         /* Ignore accesses to kernel.version */
2688         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2689                 goto out;
2690
2691         if (msg_count < 5) {
2692                 msg_count++;
2693                 printk(KERN_INFO
2694                         "warning: process `%s' used the removed sysctl "
2695                         "system call with ", current->comm);
2696                 for (i = 0; i < tmp.nlen; i++)
2697                         printk("%d.", name[i]);
2698                 printk("\n");
2699         }
2700 out:
2701         return -ENOSYS;
2702 }
2703
2704 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2705                   void __user *oldval, size_t __user *oldlenp,
2706                   void __user *newval, size_t newlen, void **context)
2707 {
2708         return -ENOSYS;
2709 }
2710
2711 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2712                 void __user *oldval, size_t __user *oldlenp,
2713                 void __user *newval, size_t newlen, void **context)
2714 {
2715         return -ENOSYS;
2716 }
2717
2718 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2719                 void __user *oldval, size_t __user *oldlenp,
2720                 void __user *newval, size_t newlen, void **context)
2721 {
2722         return -ENOSYS;
2723 }
2724
2725 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2726                 void __user *oldval, size_t __user *oldlenp,
2727                 void __user *newval, size_t newlen, void **context)
2728 {
2729         return -ENOSYS;
2730 }
2731
2732 #endif /* CONFIG_SYSCTL_SYSCALL */
2733
2734 /*
2735  * No sense putting this after each symbol definition, twice,
2736  * exception granted :-)
2737  */
2738 EXPORT_SYMBOL(proc_dointvec);
2739 EXPORT_SYMBOL(proc_dointvec_jiffies);
2740 EXPORT_SYMBOL(proc_dointvec_minmax);
2741 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2742 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2743 EXPORT_SYMBOL(proc_dostring);
2744 EXPORT_SYMBOL(proc_doulongvec_minmax);
2745 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2746 EXPORT_SYMBOL(register_sysctl_table);
2747 EXPORT_SYMBOL(sysctl_intvec);
2748 EXPORT_SYMBOL(sysctl_jiffies);
2749 EXPORT_SYMBOL(sysctl_ms_jiffies);
2750 EXPORT_SYMBOL(sysctl_string);
2751 EXPORT_SYMBOL(unregister_sysctl_table);