kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/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 #include <asm/stacktrace.h>
  58 #endif
  59
  60 #if defined(CONFIG_SYSCTL)
  61
  62 /* External variables not in a header file. */
  63 extern int C_A_D;
  64 extern int sysctl_overcommit_memory;
  65 extern int sysctl_overcommit_ratio;
  66 extern int sysctl_panic_on_oom;
  67 extern int max_threads;
  68 extern int sysrq_enabled;
  69 extern int core_uses_pid;
  70 extern int suid_dumpable;
  71 extern char core_pattern[];
  72 extern int pid_max;
  73 extern int min_free_kbytes;
  74 extern int printk_ratelimit_jiffies;
  75 extern int printk_ratelimit_burst;
  76 extern int pid_max_min, pid_max_max;
  77 extern int sysctl_drop_caches;
  78 extern int percpu_pagelist_fraction;
  79 extern int compat_log;
  80
  81 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
  82 static int maxolduid = 65535;
  83 static int minolduid;
  84 static int min_percpu_pagelist_fract = 8;
  85
  86 static int ngroups_max = NGROUPS_MAX;
  87
  88 #ifdef CONFIG_KMOD
  89 extern char modprobe_path[];
  90 #endif
  91 #ifdef CONFIG_CHR_DEV_SG
  92 extern int sg_big_buff;
  93 #endif
  94 #ifdef CONFIG_SYSVIPC
  95 static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
  96                 void __user *buffer, size_t *lenp, loff_t *ppos);
  97 static int proc_ipc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
  98                 void __user *buffer, size_t *lenp, loff_t *ppos);
  99 #endif
 100
 101 #ifdef __sparc__
 102 extern char reboot_command [];
 103 extern int stop_a_enabled;
 104 extern int scons_pwroff;
 105 #endif
 106
 107 #ifdef __hppa__
 108 extern int pwrsw_enabled;
 109 extern int unaligned_enabled;
 110 #endif
 111
 112 #ifdef CONFIG_S390
 113 #ifdef CONFIG_MATHEMU
 114 extern int sysctl_ieee_emulation_warnings;
 115 #endif
 116 extern int sysctl_userprocess_debug;
 117 extern int spin_retry;
 118 #endif
 119
 120 extern int sysctl_hz_timer;
 121
 122 #ifdef CONFIG_BSD_PROCESS_ACCT
 123 extern int acct_parm[];
 124 #endif
 125
 126 #ifdef CONFIG_IA64
 127 extern int no_unaligned_warning;
 128 #endif
 129
 130 #ifdef CONFIG_RT_MUTEXES
 131 extern int max_lock_depth;
 132 #endif
 133
 134 #ifdef CONFIG_SYSCTL_SYSCALL
 135 static int parse_table(int __user *, int, void __user *, size_t __user *,
 136                 void __user *, size_t, ctl_table *, void **);
 137 #endif
 138
 139 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
 140                   void __user *buffer, size_t *lenp, loff_t *ppos);
 141
 142 static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
 143                   void __user *oldval, size_t __user *oldlenp,
 144                   void __user *newval, size_t newlen, void **context);
 145
 146 #ifdef CONFIG_PROC_SYSCTL
 147 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
 148                   void __user *buffer, size_t *lenp, loff_t *ppos);
 149 #endif
 150
 151 static ctl_table root_table[];
 152 static struct ctl_table_header root_table_header =
 153         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 154
 155 static ctl_table kern_table[];
 156 static ctl_table vm_table[];
 157 static ctl_table fs_table[];
 158 static ctl_table debug_table[];
 159 static ctl_table dev_table[];
 160 extern ctl_table random_table[];
 161 #ifdef CONFIG_UNIX98_PTYS
 162 extern ctl_table pty_table[];
 163 #endif
 164 #ifdef CONFIG_INOTIFY_USER
 165 extern ctl_table inotify_table[];
 166 #endif
 167
 168 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 169 int sysctl_legacy_va_layout;
 170 #endif
 171
 172 static void *get_uts(ctl_table *table, int write)
 173 {
 174         char *which = table->data;
 175 #ifdef CONFIG_UTS_NS
 176         struct uts_namespace *uts_ns = current->nsproxy->uts_ns;
 177         which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
 178 #endif
 179         if (!write)
 180                 down_read(&uts_sem);
 181         else
 182                 down_write(&uts_sem);
 183         return which;
 184 }
 185
 186 static void put_uts(ctl_table *table, int write, void *which)
 187 {
 188         if (!write)
 189                 up_read(&uts_sem);
 190         else
 191                 up_write(&uts_sem);
 192 }
 193
 194 #ifdef CONFIG_SYSVIPC
 195 static void *get_ipc(ctl_table *table, int write)
 196 {
 197         char *which = table->data;
 198         struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
 199         which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
 200         return which;
 201 }
 202 #else
 203 #define get_ipc(T,W) ((T)->data)
 204 #endif
 205
 206 /* /proc declarations: */
 207
 208 #ifdef CONFIG_PROC_SYSCTL
 209
 210 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
 211 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
 212 static int proc_opensys(struct inode *, struct file *);
 213
 214 const struct file_operations proc_sys_file_operations = {
 215         .open           = proc_opensys,
 216         .read           = proc_readsys,
 217         .write          = proc_writesys,
 218 };
 219
 220 extern struct proc_dir_entry *proc_sys_root;
 221
 222 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
 223 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
 224 #endif
 225
 226 /* The default sysctl tables: */
 227
 228 static ctl_table root_table[] = {
 229         {
 230                 .ctl_name       = CTL_KERN,
 231                 .procname       = "kernel",
 232                 .mode           = 0555,
 233                 .child          = kern_table,
 234         },
 235         {
 236                 .ctl_name       = CTL_VM,
 237                 .procname       = "vm",
 238                 .mode           = 0555,
 239                 .child          = vm_table,
 240         },
 241 #ifdef CONFIG_NET
 242         {
 243                 .ctl_name       = CTL_NET,
 244                 .procname       = "net",
 245                 .mode           = 0555,
 246                 .child          = net_table,
 247         },
 248 #endif
 249         {
 250                 .ctl_name       = CTL_FS,
 251                 .procname       = "fs",
 252                 .mode           = 0555,
 253                 .child          = fs_table,
 254         },
 255         {
 256                 .ctl_name       = CTL_DEBUG,
 257                 .procname       = "debug",
 258                 .mode           = 0555,
 259                 .child          = debug_table,
 260         },
 261         {
 262                 .ctl_name       = CTL_DEV,
 263                 .procname       = "dev",
 264                 .mode           = 0555,
 265                 .child          = dev_table,
 266         },
 267
 268         { .ctl_name = 0 }
 269 };
 270
 271 static ctl_table kern_table[] = {
 272         {
 273                 .ctl_name       = KERN_OSTYPE,
 274                 .procname       = "ostype",
 275                 .data           = init_uts_ns.name.sysname,
 276                 .maxlen         = sizeof(init_uts_ns.name.sysname),
 277                 .mode           = 0444,
 278                 .proc_handler   = &proc_do_uts_string,
 279                 .strategy       = &sysctl_uts_string,
 280         },
 281         {
 282                 .ctl_name       = KERN_OSRELEASE,
 283                 .procname       = "osrelease",
 284                 .data           = init_uts_ns.name.release,
 285                 .maxlen         = sizeof(init_uts_ns.name.release),
 286                 .mode           = 0444,
 287                 .proc_handler   = &proc_do_uts_string,
 288                 .strategy       = &sysctl_uts_string,
 289         },
 290         {
 291                 .ctl_name       = KERN_VERSION,
 292                 .procname       = "version",
 293                 .data           = init_uts_ns.name.version,
 294                 .maxlen         = sizeof(init_uts_ns.name.version),
 295                 .mode           = 0444,
 296                 .proc_handler   = &proc_do_uts_string,
 297                 .strategy       = &sysctl_uts_string,
 298         },
 299         {
 300                 .ctl_name       = KERN_NODENAME,
 301                 .procname       = "hostname",
 302                 .data           = init_uts_ns.name.nodename,
 303                 .maxlen         = sizeof(init_uts_ns.name.nodename),
 304                 .mode           = 0644,
 305                 .proc_handler   = &proc_do_uts_string,
 306                 .strategy       = &sysctl_uts_string,
 307         },
 308         {
 309                 .ctl_name       = KERN_DOMAINNAME,
 310                 .procname       = "domainname",
 311                 .data           = init_uts_ns.name.domainname,
 312                 .maxlen         = sizeof(init_uts_ns.name.domainname),
 313                 .mode           = 0644,
 314                 .proc_handler   = &proc_do_uts_string,
 315                 .strategy       = &sysctl_uts_string,
 316         },
 317         {
 318                 .ctl_name       = KERN_PANIC,
 319                 .procname       = "panic",
 320                 .data           = &panic_timeout,
 321                 .maxlen         = sizeof(int),
 322                 .mode           = 0644,
 323                 .proc_handler   = &proc_dointvec,
 324         },
 325         {
 326                 .ctl_name       = KERN_CORE_USES_PID,
 327                 .procname       = "core_uses_pid",
 328                 .data           = &core_uses_pid,
 329                 .maxlen         = sizeof(int),
 330                 .mode           = 0644,
 331                 .proc_handler   = &proc_dointvec,
 332         },
 333         {
 334                 .ctl_name       = KERN_CORE_PATTERN,
 335                 .procname       = "core_pattern",
 336                 .data           = core_pattern,
 337                 .maxlen         = 128,
 338                 .mode           = 0644,
 339                 .proc_handler   = &proc_dostring,
 340                 .strategy       = &sysctl_string,
 341         },
 342         {
 343                 .ctl_name       = KERN_TAINTED,
 344                 .procname       = "tainted",
 345                 .data           = &tainted,
 346                 .maxlen         = sizeof(int),
 347                 .mode           = 0444,
 348                 .proc_handler   = &proc_dointvec,
 349         },
 350         {
 351                 .ctl_name       = KERN_CAP_BSET,
 352                 .procname       = "cap-bound",
 353                 .data           = &cap_bset,
 354                 .maxlen         = sizeof(kernel_cap_t),
 355                 .mode           = 0600,
 356                 .proc_handler   = &proc_dointvec_bset,
 357         },
 358 #ifdef CONFIG_BLK_DEV_INITRD
 359         {
 360                 .ctl_name       = KERN_REALROOTDEV,
 361                 .procname       = "real-root-dev",
 362                 .data           = &real_root_dev,
 363                 .maxlen         = sizeof(int),
 364                 .mode           = 0644,
 365                 .proc_handler   = &proc_dointvec,
 366         },
 367 #endif
 368 #ifdef __sparc__
 369         {
 370                 .ctl_name       = KERN_SPARC_REBOOT,
 371                 .procname       = "reboot-cmd",
 372                 .data           = reboot_command,
 373                 .maxlen         = 256,
 374                 .mode           = 0644,
 375                 .proc_handler   = &proc_dostring,
 376                 .strategy       = &sysctl_string,
 377         },
 378         {
 379                 .ctl_name       = KERN_SPARC_STOP_A,
 380                 .procname       = "stop-a",
 381                 .data           = &stop_a_enabled,
 382                 .maxlen         = sizeof (int),
 383                 .mode           = 0644,
 384                 .proc_handler   = &proc_dointvec,
 385         },
 386         {
 387                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 388                 .procname       = "scons-poweroff",
 389                 .data           = &scons_pwroff,
 390                 .maxlen         = sizeof (int),
 391                 .mode           = 0644,
 392                 .proc_handler   = &proc_dointvec,
 393         },
 394 #endif
 395 #ifdef __hppa__
 396         {
 397                 .ctl_name       = KERN_HPPA_PWRSW,
 398                 .procname       = "soft-power",
 399                 .data           = &pwrsw_enabled,
 400                 .maxlen         = sizeof (int),
 401                 .mode           = 0644,
 402                 .proc_handler   = &proc_dointvec,
 403         },
 404         {
 405                 .ctl_name       = KERN_HPPA_UNALIGNED,
 406                 .procname       = "unaligned-trap",
 407                 .data           = &unaligned_enabled,
 408                 .maxlen         = sizeof (int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec,
 411         },
 412 #endif
 413         {
 414                 .ctl_name       = KERN_CTLALTDEL,
 415                 .procname       = "ctrl-alt-del",
 416                 .data           = &C_A_D,
 417                 .maxlen         = sizeof(int),
 418                 .mode           = 0644,
 419                 .proc_handler   = &proc_dointvec,
 420         },
 421         {
 422                 .ctl_name       = KERN_PRINTK,
 423                 .procname       = "printk",
 424                 .data           = &console_loglevel,
 425                 .maxlen         = 4*sizeof(int),
 426                 .mode           = 0644,
 427                 .proc_handler   = &proc_dointvec,
 428         },
 429 #ifdef CONFIG_KMOD
 430         {
 431                 .ctl_name       = KERN_MODPROBE,
 432                 .procname       = "modprobe",
 433                 .data           = &modprobe_path,
 434                 .maxlen         = KMOD_PATH_LEN,
 435                 .mode           = 0644,
 436                 .proc_handler   = &proc_dostring,
 437                 .strategy       = &sysctl_string,
 438         },
 439 #endif
 440 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 441         {
 442                 .ctl_name       = KERN_HOTPLUG,
 443                 .procname       = "hotplug",
 444                 .data           = &uevent_helper,
 445                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 446                 .mode           = 0644,
 447                 .proc_handler   = &proc_dostring,
 448                 .strategy       = &sysctl_string,
 449         },
 450 #endif
 451 #ifdef CONFIG_CHR_DEV_SG
 452         {
 453                 .ctl_name       = KERN_SG_BIG_BUFF,
 454                 .procname       = "sg-big-buff",
 455                 .data           = &sg_big_buff,
 456                 .maxlen         = sizeof (int),
 457                 .mode           = 0444,
 458                 .proc_handler   = &proc_dointvec,
 459         },
 460 #endif
 461 #ifdef CONFIG_BSD_PROCESS_ACCT
 462         {
 463                 .ctl_name       = KERN_ACCT,
 464                 .procname       = "acct",
 465                 .data           = &acct_parm,
 466                 .maxlen         = 3*sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = &proc_dointvec,
 469         },
 470 #endif
 471 #ifdef CONFIG_SYSVIPC
 472         {
 473                 .ctl_name       = KERN_SHMMAX,
 474                 .procname       = "shmmax",
 475                 .data           = &init_ipc_ns.shm_ctlmax,
 476                 .maxlen         = sizeof (init_ipc_ns.shm_ctlmax),
 477                 .mode           = 0644,
 478                 .proc_handler   = &proc_ipc_doulongvec_minmax,
 479         },
 480         {
 481                 .ctl_name       = KERN_SHMALL,
 482                 .procname       = "shmall",
 483                 .data           = &init_ipc_ns.shm_ctlall,
 484                 .maxlen         = sizeof (init_ipc_ns.shm_ctlall),
 485                 .mode           = 0644,
 486                 .proc_handler   = &proc_ipc_doulongvec_minmax,
 487         },
 488         {
 489                 .ctl_name       = KERN_SHMMNI,
 490                 .procname       = "shmmni",
 491                 .data           = &init_ipc_ns.shm_ctlmni,
 492                 .maxlen         = sizeof (init_ipc_ns.shm_ctlmni),
 493                 .mode           = 0644,
 494                 .proc_handler   = &proc_ipc_dointvec,
 495         },
 496         {
 497                 .ctl_name       = KERN_MSGMAX,
 498                 .procname       = "msgmax",
 499                 .data           = &init_ipc_ns.msg_ctlmax,
 500                 .maxlen         = sizeof (init_ipc_ns.msg_ctlmax),
 501                 .mode           = 0644,
 502                 .proc_handler   = &proc_ipc_dointvec,
 503         },
 504         {
 505                 .ctl_name       = KERN_MSGMNI,
 506                 .procname       = "msgmni",
 507                 .data           = &init_ipc_ns.msg_ctlmni,
 508                 .maxlen         = sizeof (init_ipc_ns.msg_ctlmni),
 509                 .mode           = 0644,
 510                 .proc_handler   = &proc_ipc_dointvec,
 511         },
 512         {
 513                 .ctl_name       = KERN_MSGMNB,
 514                 .procname       =  "msgmnb",
 515                 .data           = &init_ipc_ns.msg_ctlmnb,
 516                 .maxlen         = sizeof (init_ipc_ns.msg_ctlmnb),
 517                 .mode           = 0644,
 518                 .proc_handler   = &proc_ipc_dointvec,
 519         },
 520         {
 521                 .ctl_name       = KERN_SEM,
 522                 .procname       = "sem",
 523                 .data           = &init_ipc_ns.sem_ctls,
 524                 .maxlen         = 4*sizeof (int),
 525                 .mode           = 0644,
 526                 .proc_handler   = &proc_ipc_dointvec,
 527         },
 528 #endif
 529 #ifdef CONFIG_MAGIC_SYSRQ
 530         {
 531                 .ctl_name       = KERN_SYSRQ,
 532                 .procname       = "sysrq",
 533                 .data           = &sysrq_enabled,
 534                 .maxlen         = sizeof (int),
 535                 .mode           = 0644,
 536                 .proc_handler   = &proc_dointvec,
 537         },
 538 #endif
 539 #ifdef CONFIG_PROC_SYSCTL
 540         {
 541                 .ctl_name       = KERN_CADPID,
 542                 .procname       = "cad_pid",
 543                 .data           = NULL,
 544                 .maxlen         = sizeof (int),
 545                 .mode           = 0600,
 546                 .proc_handler   = &proc_do_cad_pid,
 547         },
 548 #endif
 549         {
 550                 .ctl_name       = KERN_MAX_THREADS,
 551                 .procname       = "threads-max",
 552                 .data           = &max_threads,
 553                 .maxlen         = sizeof(int),
 554                 .mode           = 0644,
 555                 .proc_handler   = &proc_dointvec,
 556         },
 557         {
 558                 .ctl_name       = KERN_RANDOM,
 559                 .procname       = "random",
 560                 .mode           = 0555,
 561                 .child          = random_table,
 562         },
 563 #ifdef CONFIG_UNIX98_PTYS
 564         {
 565                 .ctl_name       = KERN_PTY,
 566                 .procname       = "pty",
 567                 .mode           = 0555,
 568                 .child          = pty_table,
 569         },
 570 #endif
 571         {
 572                 .ctl_name       = KERN_OVERFLOWUID,
 573                 .procname       = "overflowuid",
 574                 .data           = &overflowuid,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec_minmax,
 578                 .strategy       = &sysctl_intvec,
 579                 .extra1         = &minolduid,
 580                 .extra2         = &maxolduid,
 581         },
 582         {
 583                 .ctl_name       = KERN_OVERFLOWGID,
 584                 .procname       = "overflowgid",
 585                 .data           = &overflowgid,
 586                 .maxlen         = sizeof(int),
 587                 .mode           = 0644,
 588                 .proc_handler   = &proc_dointvec_minmax,
 589                 .strategy       = &sysctl_intvec,
 590                 .extra1         = &minolduid,
 591                 .extra2         = &maxolduid,
 592         },
 593 #ifdef CONFIG_S390
 594 #ifdef CONFIG_MATHEMU
 595         {
 596                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 597                 .procname       = "ieee_emulation_warnings",
 598                 .data           = &sysctl_ieee_emulation_warnings,
 599                 .maxlen         = sizeof(int),
 600                 .mode           = 0644,
 601                 .proc_handler   = &proc_dointvec,
 602         },
 603 #endif
 604 #ifdef CONFIG_NO_IDLE_HZ
 605         {
 606                 .ctl_name       = KERN_HZ_TIMER,
 607                 .procname       = "hz_timer",
 608                 .data           = &sysctl_hz_timer,
 609                 .maxlen         = sizeof(int),
 610                 .mode           = 0644,
 611                 .proc_handler   = &proc_dointvec,
 612         },
 613 #endif
 614         {
 615                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 616                 .procname       = "userprocess_debug",
 617                 .data           = &sysctl_userprocess_debug,
 618                 .maxlen         = sizeof(int),
 619                 .mode           = 0644,
 620                 .proc_handler   = &proc_dointvec,
 621         },
 622 #endif
 623         {
 624                 .ctl_name       = KERN_PIDMAX,
 625                 .procname       = "pid_max",
 626                 .data           = &pid_max,
 627                 .maxlen         = sizeof (int),
 628                 .mode           = 0644,
 629                 .proc_handler   = &proc_dointvec_minmax,
 630                 .strategy       = sysctl_intvec,
 631                 .extra1         = &pid_max_min,
 632                 .extra2         = &pid_max_max,
 633         },
 634         {
 635                 .ctl_name       = KERN_PANIC_ON_OOPS,
 636                 .procname       = "panic_on_oops",
 637                 .data           = &panic_on_oops,
 638                 .maxlen         = sizeof(int),
 639                 .mode           = 0644,
 640                 .proc_handler   = &proc_dointvec,
 641         },
 642         {
 643                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 644                 .procname       = "printk_ratelimit",
 645                 .data           = &printk_ratelimit_jiffies,
 646                 .maxlen         = sizeof(int),
 647                 .mode           = 0644,
 648                 .proc_handler   = &proc_dointvec_jiffies,
 649                 .strategy       = &sysctl_jiffies,
 650         },
 651         {
 652                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 653                 .procname       = "printk_ratelimit_burst",
 654                 .data           = &printk_ratelimit_burst,
 655                 .maxlen         = sizeof(int),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_dointvec,
 658         },
 659         {
 660                 .ctl_name       = KERN_NGROUPS_MAX,
 661                 .procname       = "ngroups_max",
 662                 .data           = &ngroups_max,
 663                 .maxlen         = sizeof (int),
 664                 .mode           = 0444,
 665                 .proc_handler   = &proc_dointvec,
 666         },
 667 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 668         {
 669                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 670                 .procname       = "unknown_nmi_panic",
 671                 .data           = &unknown_nmi_panic,
 672                 .maxlen         = sizeof (int),
 673                 .mode           = 0644,
 674                 .proc_handler   = &proc_dointvec,
 675         },
 676         {
 677                 .ctl_name       = KERN_NMI_WATCHDOG,
 678                 .procname       = "nmi_watchdog",
 679                 .data           = &nmi_watchdog_enabled,
 680                 .maxlen         = sizeof (int),
 681                 .mode           = 0644,
 682                 .proc_handler   = &proc_nmi_enabled,
 683         },
 684 #endif
 685 #if defined(CONFIG_X86)
 686         {
 687                 .ctl_name       = KERN_PANIC_ON_NMI,
 688                 .procname       = "panic_on_unrecovered_nmi",
 689                 .data           = &panic_on_unrecovered_nmi,
 690                 .maxlen         = sizeof(int),
 691                 .mode           = 0644,
 692                 .proc_handler   = &proc_dointvec,
 693         },
 694         {
 695                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 696                 .procname       = "bootloader_type",
 697                 .data           = &bootloader_type,
 698                 .maxlen         = sizeof (int),
 699                 .mode           = 0444,
 700                 .proc_handler   = &proc_dointvec,
 701         },
 702         {
 703                 .ctl_name       = CTL_UNNUMBERED,
 704                 .procname       = "kstack_depth_to_print",
 705                 .data           = &kstack_depth_to_print,
 706                 .maxlen         = sizeof(int),
 707                 .mode           = 0644,
 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_path.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 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
1749                   void __user *buffer, size_t *lenp, loff_t *ppos)
1750 {
1751         int r;
1752         void *which;
1753         which = get_uts(table, write);
1754         r = _proc_do_string(which, table->maxlen,write,filp,buffer,lenp, ppos);
1755         put_uts(table, write, which);
1756         return r;
1757 }
1758
1759 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1760                                  int *valp,
1761                                  int write, void *data)
1762 {
1763         if (write) {
1764                 *valp = *negp ? -*lvalp : *lvalp;
1765         } else {
1766                 int val = *valp;
1767                 if (val < 0) {
1768                         *negp = -1;
1769                         *lvalp = (unsigned long)-val;
1770                 } else {
1771                         *negp = 0;
1772                         *lvalp = (unsigned long)val;
1773                 }
1774         }
1775         return 0;
1776 }
1777
1778 static int __do_proc_dointvec(void *tbl_data, ctl_table *table,
1779                   int write, struct file *filp, void __user *buffer,
1780                   size_t *lenp, loff_t *ppos,
1781                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1782                               int write, void *data),
1783                   void *data)
1784 {
1785 #define TMPBUFLEN 21
1786         int *i, vleft, first=1, neg, val;
1787         unsigned long lval;
1788         size_t left, len;
1789
1790         char buf[TMPBUFLEN], *p;
1791         char __user *s = buffer;
1792
1793         if (!tbl_data || !table->maxlen || !*lenp ||
1794             (*ppos && !write)) {
1795                 *lenp = 0;
1796                 return 0;
1797         }
1798
1799         i = (int *) tbl_data;
1800         vleft = table->maxlen / sizeof(*i);
1801         left = *lenp;
1802
1803         if (!conv)
1804                 conv = do_proc_dointvec_conv;
1805
1806         for (; left && vleft--; i++, first=0) {
1807                 if (write) {
1808                         while (left) {
1809                                 char c;
1810                                 if (get_user(c, s))
1811                                         return -EFAULT;
1812                                 if (!isspace(c))
1813                                         break;
1814                                 left--;
1815                                 s++;
1816                         }
1817                         if (!left)
1818                                 break;
1819                         neg = 0;
1820                         len = left;
1821                         if (len > sizeof(buf) - 1)
1822                                 len = sizeof(buf) - 1;
1823                         if (copy_from_user(buf, s, len))
1824                                 return -EFAULT;
1825                         buf[len] = 0;
1826                         p = buf;
1827                         if (*p == '-' && left > 1) {
1828                                 neg = 1;
1829                                 p++;
1830                         }
1831                         if (*p < '0' || *p > '9')
1832                                 break;
1833
1834                         lval = simple_strtoul(p, &p, 0);
1835
1836                         len = p-buf;
1837                         if ((len < left) && *p && !isspace(*p))
1838                                 break;
1839                         if (neg)
1840                                 val = -val;
1841                         s += len;
1842                         left -= len;
1843
1844                         if (conv(&neg, &lval, i, 1, data))
1845                                 break;
1846                 } else {
1847                         p = buf;
1848                         if (!first)
1849                                 *p++ = '\t';
1850
1851                         if (conv(&neg, &lval, i, 0, data))
1852                                 break;
1853
1854                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1855                         len = strlen(buf);
1856                         if (len > left)
1857                                 len = left;
1858                         if(copy_to_user(s, buf, len))
1859                                 return -EFAULT;
1860                         left -= len;
1861                         s += len;
1862                 }
1863         }
1864
1865         if (!write && !first && left) {
1866                 if(put_user('\n', s))
1867                         return -EFAULT;
1868                 left--, s++;
1869         }
1870         if (write) {
1871                 while (left) {
1872                         char c;
1873                         if (get_user(c, s++))
1874                                 return -EFAULT;
1875                         if (!isspace(c))
1876                                 break;
1877                         left--;
1878                 }
1879         }
1880         if (write && first)
1881                 return -EINVAL;
1882         *lenp -= left;
1883         *ppos += *lenp;
1884         return 0;
1885 #undef TMPBUFLEN
1886 }
1887
1888 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1889                   void __user *buffer, size_t *lenp, loff_t *ppos,
1890                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1891                               int write, void *data),
1892                   void *data)
1893 {
1894         return __do_proc_dointvec(table->data, table, write, filp,
1895                         buffer, lenp, ppos, conv, data);
1896 }
1897
1898 /**
1899  * proc_dointvec - read a vector of integers
1900  * @table: the sysctl table
1901  * @write: %TRUE if this is a write to the sysctl file
1902  * @filp: the file structure
1903  * @buffer: the user buffer
1904  * @lenp: the size of the user buffer
1905  * @ppos: file position
1906  *
1907  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1908  * values from/to the user buffer, treated as an ASCII string.
1909  *
1910  * Returns 0 on success.
1911  */
1912 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1913                      void __user *buffer, size_t *lenp, loff_t *ppos)
1914 {
1915     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1916                             NULL,NULL);
1917 }
1918
1919 #define OP_SET  0
1920 #define OP_AND  1
1921 #define OP_OR   2
1922 #define OP_MAX  3
1923 #define OP_MIN  4
1924
1925 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1926                                       int *valp,
1927                                       int write, void *data)
1928 {
1929         int op = *(int *)data;
1930         if (write) {
1931                 int val = *negp ? -*lvalp : *lvalp;
1932                 switch(op) {
1933                 case OP_SET:    *valp = val; break;
1934                 case OP_AND:    *valp &= val; break;
1935                 case OP_OR:     *valp |= val; break;
1936                 case OP_MAX:    if(*valp < val)
1937                                         *valp = val;
1938                                 break;
1939                 case OP_MIN:    if(*valp > val)
1940                                 *valp = val;
1941                                 break;
1942                 }
1943         } else {
1944                 int val = *valp;
1945                 if (val < 0) {
1946                         *negp = -1;
1947                         *lvalp = (unsigned long)-val;
1948                 } else {
1949                         *negp = 0;
1950                         *lvalp = (unsigned long)val;
1951                 }
1952         }
1953         return 0;
1954 }
1955
1956 /*
1957  *      init may raise the set.
1958  */
1959
1960 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1961                         void __user *buffer, size_t *lenp, loff_t *ppos)
1962 {
1963         int op;
1964
1965         if (!capable(CAP_SYS_MODULE)) {
1966                 return -EPERM;
1967         }
1968
1969         op = is_init(current) ? OP_SET : OP_AND;
1970         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1971                                 do_proc_dointvec_bset_conv,&op);
1972 }
1973
1974 struct do_proc_dointvec_minmax_conv_param {
1975         int *min;
1976         int *max;
1977 };
1978
1979 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1980                                         int *valp,
1981                                         int write, void *data)
1982 {
1983         struct do_proc_dointvec_minmax_conv_param *param = data;
1984         if (write) {
1985                 int val = *negp ? -*lvalp : *lvalp;
1986                 if ((param->min && *param->min > val) ||
1987                     (param->max && *param->max < val))
1988                         return -EINVAL;
1989                 *valp = val;
1990         } else {
1991                 int val = *valp;
1992                 if (val < 0) {
1993                         *negp = -1;
1994                         *lvalp = (unsigned long)-val;
1995                 } else {
1996                         *negp = 0;
1997                         *lvalp = (unsigned long)val;
1998                 }
1999         }
2000         return 0;
2001 }
2002
2003 /**
2004  * proc_dointvec_minmax - read a vector of integers with min/max values
2005  * @table: the sysctl table
2006  * @write: %TRUE if this is a write to the sysctl file
2007  * @filp: the file structure
2008  * @buffer: the user buffer
2009  * @lenp: the size of the user buffer
2010  * @ppos: file position
2011  *
2012  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2013  * values from/to the user buffer, treated as an ASCII string.
2014  *
2015  * This routine will ensure the values are within the range specified by
2016  * table->extra1 (min) and table->extra2 (max).
2017  *
2018  * Returns 0 on success.
2019  */
2020 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2021                   void __user *buffer, size_t *lenp, loff_t *ppos)
2022 {
2023         struct do_proc_dointvec_minmax_conv_param param = {
2024                 .min = (int *) table->extra1,
2025                 .max = (int *) table->extra2,
2026         };
2027         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2028                                 do_proc_dointvec_minmax_conv, &param);
2029 }
2030
2031 static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write,
2032                                      struct file *filp,
2033                                      void __user *buffer,
2034                                      size_t *lenp, loff_t *ppos,
2035                                      unsigned long convmul,
2036                                      unsigned long convdiv)
2037 {
2038 #define TMPBUFLEN 21
2039         unsigned long *i, *min, *max, val;
2040         int vleft, first=1, neg;
2041         size_t len, left;
2042         char buf[TMPBUFLEN], *p;
2043         char __user *s = buffer;
2044
2045         if (!data || !table->maxlen || !*lenp ||
2046             (*ppos && !write)) {
2047                 *lenp = 0;
2048                 return 0;
2049         }
2050
2051         i = (unsigned long *) data;
2052         min = (unsigned long *) table->extra1;
2053         max = (unsigned long *) table->extra2;
2054         vleft = table->maxlen / sizeof(unsigned long);
2055         left = *lenp;
2056
2057         for (; left && vleft--; i++, min++, max++, first=0) {
2058                 if (write) {
2059                         while (left) {
2060                                 char c;
2061                                 if (get_user(c, s))
2062                                         return -EFAULT;
2063                                 if (!isspace(c))
2064                                         break;
2065                                 left--;
2066                                 s++;
2067                         }
2068                         if (!left)
2069                                 break;
2070                         neg = 0;
2071                         len = left;
2072                         if (len > TMPBUFLEN-1)
2073                                 len = TMPBUFLEN-1;
2074                         if (copy_from_user(buf, s, len))
2075                                 return -EFAULT;
2076                         buf[len] = 0;
2077                         p = buf;
2078                         if (*p == '-' && left > 1) {
2079                                 neg = 1;
2080                                 p++;
2081                         }
2082                         if (*p < '0' || *p > '9')
2083                                 break;
2084                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2085                         len = p-buf;
2086                         if ((len < left) && *p && !isspace(*p))
2087                                 break;
2088                         if (neg)
2089                                 val = -val;
2090                         s += len;
2091                         left -= len;
2092
2093                         if(neg)
2094                                 continue;
2095                         if ((min && val < *min) || (max && val > *max))
2096                                 continue;
2097                         *i = val;
2098                 } else {
2099                         p = buf;
2100                         if (!first)
2101                                 *p++ = '\t';
2102                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2103                         len = strlen(buf);
2104                         if (len > left)
2105                                 len = left;
2106                         if(copy_to_user(s, buf, len))
2107                                 return -EFAULT;
2108                         left -= len;
2109                         s += len;
2110                 }
2111         }
2112
2113         if (!write && !first && left) {
2114                 if(put_user('\n', s))
2115                         return -EFAULT;
2116                 left--, s++;
2117         }
2118         if (write) {
2119                 while (left) {
2120                         char c;
2121                         if (get_user(c, s++))
2122                                 return -EFAULT;
2123                         if (!isspace(c))
2124                                 break;
2125                         left--;
2126                 }
2127         }
2128         if (write && first)
2129                 return -EINVAL;
2130         *lenp -= left;
2131         *ppos += *lenp;
2132         return 0;
2133 #undef TMPBUFLEN
2134 }
2135
2136 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
2137                                      struct file *filp,
2138                                      void __user *buffer,
2139                                      size_t *lenp, loff_t *ppos,
2140                                      unsigned long convmul,
2141                                      unsigned long convdiv)
2142 {
2143         return __do_proc_doulongvec_minmax(table->data, table, write,
2144                         filp, buffer, lenp, ppos, convmul, convdiv);
2145 }
2146
2147 /**
2148  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2149  * @table: the sysctl table
2150  * @write: %TRUE if this is a write to the sysctl file
2151  * @filp: the file structure
2152  * @buffer: the user buffer
2153  * @lenp: the size of the user buffer
2154  * @ppos: file position
2155  *
2156  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2157  * values from/to the user buffer, treated as an ASCII string.
2158  *
2159  * This routine will ensure the values are within the range specified by
2160  * table->extra1 (min) and table->extra2 (max).
2161  *
2162  * Returns 0 on success.
2163  */
2164 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2165                            void __user *buffer, size_t *lenp, loff_t *ppos)
2166 {
2167     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2168 }
2169
2170 /**
2171  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2172  * @table: the sysctl table
2173  * @write: %TRUE if this is a write to the sysctl file
2174  * @filp: the file structure
2175  * @buffer: the user buffer
2176  * @lenp: the size of the user buffer
2177  * @ppos: file position
2178  *
2179  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2180  * values from/to the user buffer, treated as an ASCII string. The values
2181  * are treated as milliseconds, and converted to jiffies when they are stored.
2182  *
2183  * This routine will ensure the values are within the range specified by
2184  * table->extra1 (min) and table->extra2 (max).
2185  *
2186  * Returns 0 on success.
2187  */
2188 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2189                                       struct file *filp,
2190                                       void __user *buffer,
2191                                       size_t *lenp, loff_t *ppos)
2192 {
2193     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2194                                      lenp, ppos, HZ, 1000l);
2195 }
2196
2197
2198 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2199                                          int *valp,
2200                                          int write, void *data)
2201 {
2202         if (write) {
2203                 if (*lvalp > LONG_MAX / HZ)
2204                         return 1;
2205                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2206         } else {
2207                 int val = *valp;
2208                 unsigned long lval;
2209                 if (val < 0) {
2210                         *negp = -1;
2211                         lval = (unsigned long)-val;
2212                 } else {
2213                         *negp = 0;
2214                         lval = (unsigned long)val;
2215                 }
2216                 *lvalp = lval / HZ;
2217         }
2218         return 0;
2219 }
2220
2221 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2222                                                 int *valp,
2223                                                 int write, void *data)
2224 {
2225         if (write) {
2226                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2227                         return 1;
2228                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2229         } else {
2230                 int val = *valp;
2231                 unsigned long lval;
2232                 if (val < 0) {
2233                         *negp = -1;
2234                         lval = (unsigned long)-val;
2235                 } else {
2236                         *negp = 0;
2237                         lval = (unsigned long)val;
2238                 }
2239                 *lvalp = jiffies_to_clock_t(lval);
2240         }
2241         return 0;
2242 }
2243
2244 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2245                                             int *valp,
2246                                             int write, void *data)
2247 {
2248         if (write) {
2249                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2250         } else {
2251                 int val = *valp;
2252                 unsigned long lval;
2253                 if (val < 0) {
2254                         *negp = -1;
2255                         lval = (unsigned long)-val;
2256                 } else {
2257                         *negp = 0;
2258                         lval = (unsigned long)val;
2259                 }
2260                 *lvalp = jiffies_to_msecs(lval);
2261         }
2262         return 0;
2263 }
2264
2265 /**
2266  * proc_dointvec_jiffies - read a vector of integers as seconds
2267  * @table: the sysctl table
2268  * @write: %TRUE if this is a write to the sysctl file
2269  * @filp: the file structure
2270  * @buffer: the user buffer
2271  * @lenp: the size of the user buffer
2272  * @ppos: file position
2273  *
2274  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2275  * values from/to the user buffer, treated as an ASCII string.
2276  * The values read are assumed to be in seconds, and are converted into
2277  * jiffies.
2278  *
2279  * Returns 0 on success.
2280  */
2281 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2282                           void __user *buffer, size_t *lenp, loff_t *ppos)
2283 {
2284     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2285                             do_proc_dointvec_jiffies_conv,NULL);
2286 }
2287
2288 /**
2289  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2290  * @table: the sysctl table
2291  * @write: %TRUE if this is a write to the sysctl file
2292  * @filp: the file structure
2293  * @buffer: the user buffer
2294  * @lenp: the size of the user buffer
2295  * @ppos: pointer to the file position
2296  *
2297  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2298  * values from/to the user buffer, treated as an ASCII string.
2299  * The values read are assumed to be in 1/USER_HZ seconds, and
2300  * are converted into jiffies.
2301  *
2302  * Returns 0 on success.
2303  */
2304 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2305                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2306 {
2307     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2308                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2309 }
2310
2311 /**
2312  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2313  * @table: the sysctl table
2314  * @write: %TRUE if this is a write to the sysctl file
2315  * @filp: the file structure
2316  * @buffer: the user buffer
2317  * @lenp: the size of the user buffer
2318  * @ppos: file position
2319  * @ppos: the current position in the file
2320  *
2321  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2322  * values from/to the user buffer, treated as an ASCII string.
2323  * The values read are assumed to be in 1/1000 seconds, and
2324  * are converted into jiffies.
2325  *
2326  * Returns 0 on success.
2327  */
2328 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2329                              void __user *buffer, size_t *lenp, loff_t *ppos)
2330 {
2331         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2332                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2333 }
2334
2335 #ifdef CONFIG_SYSVIPC
2336 static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
2337         void __user *buffer, size_t *lenp, loff_t *ppos)
2338 {
2339         void *which;
2340         which = get_ipc(table, write);
2341         return __do_proc_dointvec(which, table, write, filp, buffer,
2342                         lenp, ppos, NULL, NULL);
2343 }
2344
2345 static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
2346         struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
2347 {
2348         void *which;
2349         which = get_ipc(table, write);
2350         return __do_proc_doulongvec_minmax(which, table, write, filp, buffer,
2351                         lenp, ppos, 1l, 1l);
2352 }
2353
2354 #endif
2355
2356 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
2357                            void __user *buffer, size_t *lenp, loff_t *ppos)
2358 {
2359         struct pid *new_pid;
2360         pid_t tmp;
2361         int r;
2362
2363         tmp = pid_nr(cad_pid);
2364
2365         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2366                                lenp, ppos, NULL, NULL);
2367         if (r || !write)
2368                 return r;
2369
2370         new_pid = find_get_pid(tmp);
2371         if (!new_pid)
2372                 return -ESRCH;
2373
2374         put_pid(xchg(&cad_pid, new_pid));
2375         return 0;
2376 }
2377
2378 #else /* CONFIG_PROC_FS */
2379
2380 int proc_dostring(ctl_table *table, int write, struct file *filp,
2381                   void __user *buffer, size_t *lenp, loff_t *ppos)
2382 {
2383         return -ENOSYS;
2384 }
2385
2386 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
2387                 void __user *buffer, size_t *lenp, loff_t *ppos)
2388 {
2389         return -ENOSYS;
2390 }
2391
2392 #ifdef CONFIG_SYSVIPC
2393 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2394                 void __user *buffer, size_t *lenp, loff_t *ppos)
2395 {
2396         return -ENOSYS;
2397 }
2398 #endif
2399
2400 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2401                   void __user *buffer, size_t *lenp, loff_t *ppos)
2402 {
2403         return -ENOSYS;
2404 }
2405
2406 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2407                         void __user *buffer, size_t *lenp, loff_t *ppos)
2408 {
2409         return -ENOSYS;
2410 }
2411
2412 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2413                     void __user *buffer, size_t *lenp, loff_t *ppos)
2414 {
2415         return -ENOSYS;
2416 }
2417
2418 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2419                     void __user *buffer, size_t *lenp, loff_t *ppos)
2420 {
2421         return -ENOSYS;
2422 }
2423
2424 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2425                     void __user *buffer, size_t *lenp, loff_t *ppos)
2426 {
2427         return -ENOSYS;
2428 }
2429
2430 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2431                              void __user *buffer, size_t *lenp, loff_t *ppos)
2432 {
2433         return -ENOSYS;
2434 }
2435
2436 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2437                     void __user *buffer, size_t *lenp, loff_t *ppos)
2438 {
2439         return -ENOSYS;
2440 }
2441
2442 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2443                                       struct file *filp,
2444                                       void __user *buffer,
2445                                       size_t *lenp, loff_t *ppos)
2446 {
2447     return -ENOSYS;
2448 }
2449
2450
2451 #endif /* CONFIG_PROC_FS */
2452
2453
2454 #ifdef CONFIG_SYSCTL_SYSCALL
2455 /*
2456  * General sysctl support routines
2457  */
2458
2459 /* The generic string strategy routine: */
2460 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2461                   void __user *oldval, size_t __user *oldlenp,
2462                   void __user *newval, size_t newlen, void **context)
2463 {
2464         if (!table->data || !table->maxlen)
2465                 return -ENOTDIR;
2466
2467         if (oldval && oldlenp) {
2468                 size_t bufsize;
2469                 if (get_user(bufsize, oldlenp))
2470                         return -EFAULT;
2471                 if (bufsize) {
2472                         size_t len = strlen(table->data), copied;
2473
2474                         /* This shouldn't trigger for a well-formed sysctl */
2475                         if (len > table->maxlen)
2476                                 len = table->maxlen;
2477
2478                         /* Copy up to a max of bufsize-1 bytes of the string */
2479                         copied = (len >= bufsize) ? bufsize - 1 : len;
2480
2481                         if (copy_to_user(oldval, table->data, copied) ||
2482                             put_user(0, (char __user *)(oldval + copied)))
2483                                 return -EFAULT;
2484                         if (put_user(len, oldlenp))
2485                                 return -EFAULT;
2486                 }
2487         }
2488         if (newval && newlen) {
2489                 size_t len = newlen;
2490                 if (len > table->maxlen)
2491                         len = table->maxlen;
2492                 if(copy_from_user(table->data, newval, len))
2493                         return -EFAULT;
2494                 if (len == table->maxlen)
2495                         len--;
2496                 ((char *) table->data)[len] = 0;
2497         }
2498         return 1;
2499 }
2500
2501 /*
2502  * This function makes sure that all of the integers in the vector
2503  * are between the minimum and maximum values given in the arrays
2504  * table->extra1 and table->extra2, respectively.
2505  */
2506 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2507                 void __user *oldval, size_t __user *oldlenp,
2508                 void __user *newval, size_t newlen, void **context)
2509 {
2510
2511         if (newval && newlen) {
2512                 int __user *vec = (int __user *) newval;
2513                 int *min = (int *) table->extra1;
2514                 int *max = (int *) table->extra2;
2515                 size_t length;
2516                 int i;
2517
2518                 if (newlen % sizeof(int) != 0)
2519                         return -EINVAL;
2520
2521                 if (!table->extra1 && !table->extra2)
2522                         return 0;
2523
2524                 if (newlen > table->maxlen)
2525                         newlen = table->maxlen;
2526                 length = newlen / sizeof(int);
2527
2528                 for (i = 0; i < length; i++) {
2529                         int value;
2530                         if (get_user(value, vec + i))
2531                                 return -EFAULT;
2532                         if (min && value < min[i])
2533                                 return -EINVAL;
2534                         if (max && value > max[i])
2535                                 return -EINVAL;
2536                 }
2537         }
2538         return 0;
2539 }
2540
2541 /* Strategy function to convert jiffies to seconds */
2542 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2543                 void __user *oldval, size_t __user *oldlenp,
2544                 void __user *newval, size_t newlen, void **context)
2545 {
2546         if (oldval) {
2547                 size_t olen;
2548                 if (oldlenp) {
2549                         if (get_user(olen, oldlenp))
2550                                 return -EFAULT;
2551                         if (olen!=sizeof(int))
2552                                 return -EINVAL;
2553                 }
2554                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2555                     (oldlenp && put_user(sizeof(int),oldlenp)))
2556                         return -EFAULT;
2557         }
2558         if (newval && newlen) {
2559                 int new;
2560                 if (newlen != sizeof(int))
2561                         return -EINVAL;
2562                 if (get_user(new, (int __user *)newval))
2563                         return -EFAULT;
2564                 *(int *)(table->data) = new*HZ;
2565         }
2566         return 1;
2567 }
2568
2569 /* Strategy function to convert jiffies to seconds */
2570 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2571                 void __user *oldval, size_t __user *oldlenp,
2572                 void __user *newval, size_t newlen, void **context)
2573 {
2574         if (oldval) {
2575                 size_t olen;
2576                 if (oldlenp) {
2577                         if (get_user(olen, oldlenp))
2578                                 return -EFAULT;
2579                         if (olen!=sizeof(int))
2580                                 return -EINVAL;
2581                 }
2582                 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2583                     (oldlenp && put_user(sizeof(int),oldlenp)))
2584                         return -EFAULT;
2585         }
2586         if (newval && newlen) {
2587                 int new;
2588                 if (newlen != sizeof(int))
2589                         return -EINVAL;
2590                 if (get_user(new, (int __user *)newval))
2591                         return -EFAULT;
2592                 *(int *)(table->data) = msecs_to_jiffies(new);
2593         }
2594         return 1;
2595 }
2596
2597
2598 /* The generic string strategy routine: */
2599 static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
2600                   void __user *oldval, size_t __user *oldlenp,
2601                   void __user *newval, size_t newlen, void **context)
2602 {
2603         struct ctl_table uts_table;
2604         int r, write;
2605         write = newval && newlen;
2606         memcpy(&uts_table, table, sizeof(uts_table));
2607         uts_table.data = get_uts(table, write);
2608         r = sysctl_string(&uts_table, name, nlen,
2609                 oldval, oldlenp, newval, newlen, context);
2610         put_uts(table, write, uts_table.data);
2611         return r;
2612 }
2613
2614 #else /* CONFIG_SYSCTL_SYSCALL */
2615
2616
2617 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2618 {
2619         static int msg_count;
2620         struct __sysctl_args tmp;
2621         int name[CTL_MAXNAME];
2622         int i;
2623
2624         /* Read in the sysctl name for better debug message logging */
2625         if (copy_from_user(&tmp, args, sizeof(tmp)))
2626                 return -EFAULT;
2627         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2628                 return -ENOTDIR;
2629         for (i = 0; i < tmp.nlen; i++)
2630                 if (get_user(name[i], tmp.name + i))
2631                         return -EFAULT;
2632
2633         /* Ignore accesses to kernel.version */
2634         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2635                 goto out;
2636
2637         if (msg_count < 5) {
2638                 msg_count++;
2639                 printk(KERN_INFO
2640                         "warning: process `%s' used the removed sysctl "
2641                         "system call with ", current->comm);
2642                 for (i = 0; i < tmp.nlen; i++)
2643                         printk("%d.", name[i]);
2644                 printk("\n");
2645         }
2646 out:
2647         return -ENOSYS;
2648 }
2649
2650 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2651                   void __user *oldval, size_t __user *oldlenp,
2652                   void __user *newval, size_t newlen, void **context)
2653 {
2654         return -ENOSYS;
2655 }
2656
2657 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2658                 void __user *oldval, size_t __user *oldlenp,
2659                 void __user *newval, size_t newlen, void **context)
2660 {
2661         return -ENOSYS;
2662 }
2663
2664 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2665                 void __user *oldval, size_t __user *oldlenp,
2666                 void __user *newval, size_t newlen, void **context)
2667 {
2668         return -ENOSYS;
2669 }
2670
2671 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2672                 void __user *oldval, size_t __user *oldlenp,
2673                 void __user *newval, size_t newlen, void **context)
2674 {
2675         return -ENOSYS;
2676 }
2677
2678 static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
2679                   void __user *oldval, size_t __user *oldlenp,
2680                   void __user *newval, size_t newlen, void **context)
2681 {
2682         return -ENOSYS;
2683 }
2684 #endif /* CONFIG_SYSCTL_SYSCALL */
2685
2686 /*
2687  * No sense putting this after each symbol definition, twice,
2688  * exception granted :-)
2689  */
2690 EXPORT_SYMBOL(proc_dointvec);
2691 EXPORT_SYMBOL(proc_dointvec_jiffies);
2692 EXPORT_SYMBOL(proc_dointvec_minmax);
2693 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2694 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2695 EXPORT_SYMBOL(proc_dostring);
2696 EXPORT_SYMBOL(proc_doulongvec_minmax);
2697 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2698 EXPORT_SYMBOL(register_sysctl_table);
2699 EXPORT_SYMBOL(sysctl_intvec);
2700 EXPORT_SYMBOL(sysctl_jiffies);
2701 EXPORT_SYMBOL(sysctl_ms_jiffies);
2702 EXPORT_SYMBOL(sysctl_string);
2703 EXPORT_SYMBOL(unregister_sysctl_table);