SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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_do_ipc_string(ctl_table *table, int write, struct file *filp,
  96                 void __user *buffer, size_t *lenp, loff_t *ppos);
  97 #endif
  98
  99 #ifdef __sparc__
 100 extern char reboot_command [];
 101 extern int stop_a_enabled;
 102 extern int scons_pwroff;
 103 #endif
 104
 105 #ifdef __hppa__
 106 extern int pwrsw_enabled;
 107 extern int unaligned_enabled;
 108 #endif
 109
 110 #ifdef CONFIG_S390
 111 #ifdef CONFIG_MATHEMU
 112 extern int sysctl_ieee_emulation_warnings;
 113 #endif
 114 extern int sysctl_userprocess_debug;
 115 extern int spin_retry;
 116 #endif
 117
 118 extern int sysctl_hz_timer;
 119
 120 #ifdef CONFIG_BSD_PROCESS_ACCT
 121 extern int acct_parm[];
 122 #endif
 123
 124 #ifdef CONFIG_IA64
 125 extern int no_unaligned_warning;
 126 #endif
 127
 128 #ifdef CONFIG_RT_MUTEXES
 129 extern int max_lock_depth;
 130 #endif
 131
 132 #ifdef CONFIG_SYSCTL_SYSCALL
 133 static int parse_table(int __user *, int, void __user *, size_t __user *,
 134                 void __user *, size_t, ctl_table *, void **);
 135 #endif
 136
 137 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
 138                   void __user *buffer, size_t *lenp, loff_t *ppos);
 139
 140 static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
 141                   void __user *oldval, size_t __user *oldlenp,
 142                   void __user *newval, size_t newlen, void **context);
 143
 144 #ifdef CONFIG_PROC_SYSCTL
 145 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
 146                   void __user *buffer, size_t *lenp, loff_t *ppos);
 147 #endif
 148
 149 static ctl_table root_table[];
 150 static struct ctl_table_header root_table_header =
 151         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 152
 153 static ctl_table kern_table[];
 154 static ctl_table vm_table[];
 155 static ctl_table fs_table[];
 156 static ctl_table debug_table[];
 157 static ctl_table dev_table[];
 158 extern ctl_table random_table[];
 159 #ifdef CONFIG_UNIX98_PTYS
 160 extern ctl_table pty_table[];
 161 #endif
 162 #ifdef CONFIG_INOTIFY_USER
 163 extern ctl_table inotify_table[];
 164 #endif
 165
 166 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 167 int sysctl_legacy_va_layout;
 168 #endif
 169
 170 static void *get_uts(ctl_table *table, int write)
 171 {
 172         char *which = table->data;
 173 #ifdef CONFIG_UTS_NS
 174         struct uts_namespace *uts_ns = current->nsproxy->uts_ns;
 175         which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
 176 #endif
 177         if (!write)
 178                 down_read(&uts_sem);
 179         else
 180                 down_write(&uts_sem);
 181         return which;
 182 }
 183
 184 static void put_uts(ctl_table *table, int write, void *which)
 185 {
 186         if (!write)
 187                 up_read(&uts_sem);
 188         else
 189                 up_write(&uts_sem);
 190 }
 191
 192 /* /proc declarations: */
 193
 194 #ifdef CONFIG_PROC_SYSCTL
 195
 196 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
 197 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
 198 static int proc_opensys(struct inode *, struct file *);
 199
 200 const struct file_operations proc_sys_file_operations = {
 201         .open           = proc_opensys,
 202         .read           = proc_readsys,
 203         .write          = proc_writesys,
 204 };
 205
 206 extern struct proc_dir_entry *proc_sys_root;
 207
 208 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
 209 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
 210 #endif
 211
 212 /* The default sysctl tables: */
 213
 214 static ctl_table root_table[] = {
 215         {
 216                 .ctl_name       = CTL_KERN,
 217                 .procname       = "kernel",
 218                 .mode           = 0555,
 219                 .child          = kern_table,
 220         },
 221         {
 222                 .ctl_name       = CTL_VM,
 223                 .procname       = "vm",
 224                 .mode           = 0555,
 225                 .child          = vm_table,
 226         },
 227 #ifdef CONFIG_NET
 228         {
 229                 .ctl_name       = CTL_NET,
 230                 .procname       = "net",
 231                 .mode           = 0555,
 232                 .child          = net_table,
 233         },
 234 #endif
 235         {
 236                 .ctl_name       = CTL_FS,
 237                 .procname       = "fs",
 238                 .mode           = 0555,
 239                 .child          = fs_table,
 240         },
 241         {
 242                 .ctl_name       = CTL_DEBUG,
 243                 .procname       = "debug",
 244                 .mode           = 0555,
 245                 .child          = debug_table,
 246         },
 247         {
 248                 .ctl_name       = CTL_DEV,
 249                 .procname       = "dev",
 250                 .mode           = 0555,
 251                 .child          = dev_table,
 252         },
 253
 254         { .ctl_name = 0 }
 255 };
 256
 257 static ctl_table kern_table[] = {
 258         {
 259                 .ctl_name       = KERN_OSTYPE,
 260                 .procname       = "ostype",
 261                 .data           = init_uts_ns.name.sysname,
 262                 .maxlen         = sizeof(init_uts_ns.name.sysname),
 263                 .mode           = 0444,
 264                 .proc_handler   = &proc_do_uts_string,
 265                 .strategy       = &sysctl_uts_string,
 266         },
 267         {
 268                 .ctl_name       = KERN_OSRELEASE,
 269                 .procname       = "osrelease",
 270                 .data           = init_uts_ns.name.release,
 271                 .maxlen         = sizeof(init_uts_ns.name.release),
 272                 .mode           = 0444,
 273                 .proc_handler   = &proc_do_uts_string,
 274                 .strategy       = &sysctl_uts_string,
 275         },
 276         {
 277                 .ctl_name       = KERN_VERSION,
 278                 .procname       = "version",
 279                 .data           = init_uts_ns.name.version,
 280                 .maxlen         = sizeof(init_uts_ns.name.version),
 281                 .mode           = 0444,
 282                 .proc_handler   = &proc_do_uts_string,
 283                 .strategy       = &sysctl_uts_string,
 284         },
 285         {
 286                 .ctl_name       = KERN_NODENAME,
 287                 .procname       = "hostname",
 288                 .data           = init_uts_ns.name.nodename,
 289                 .maxlen         = sizeof(init_uts_ns.name.nodename),
 290                 .mode           = 0644,
 291                 .proc_handler   = &proc_do_uts_string,
 292                 .strategy       = &sysctl_uts_string,
 293         },
 294         {
 295                 .ctl_name       = KERN_DOMAINNAME,
 296                 .procname       = "domainname",
 297                 .data           = init_uts_ns.name.domainname,
 298                 .maxlen         = sizeof(init_uts_ns.name.domainname),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_do_uts_string,
 301                 .strategy       = &sysctl_uts_string,
 302         },
 303         {
 304                 .ctl_name       = KERN_PANIC,
 305                 .procname       = "panic",
 306                 .data           = &panic_timeout,
 307                 .maxlen         = sizeof(int),
 308                 .mode           = 0644,
 309                 .proc_handler   = &proc_dointvec,
 310         },
 311         {
 312                 .ctl_name       = KERN_CORE_USES_PID,
 313                 .procname       = "core_uses_pid",
 314                 .data           = &core_uses_pid,
 315                 .maxlen         = sizeof(int),
 316                 .mode           = 0644,
 317                 .proc_handler   = &proc_dointvec,
 318         },
 319         {
 320                 .ctl_name       = KERN_CORE_PATTERN,
 321                 .procname       = "core_pattern",
 322                 .data           = core_pattern,
 323                 .maxlen         = 128,
 324                 .mode           = 0644,
 325                 .proc_handler   = &proc_dostring,
 326                 .strategy       = &sysctl_string,
 327         },
 328         {
 329                 .ctl_name       = KERN_TAINTED,
 330                 .procname       = "tainted",
 331                 .data           = &tainted,
 332                 .maxlen         = sizeof(int),
 333                 .mode           = 0444,
 334                 .proc_handler   = &proc_dointvec,
 335         },
 336         {
 337                 .ctl_name       = KERN_CAP_BSET,
 338                 .procname       = "cap-bound",
 339                 .data           = &cap_bset,
 340                 .maxlen         = sizeof(kernel_cap_t),
 341                 .mode           = 0600,
 342                 .proc_handler   = &proc_dointvec_bset,
 343         },
 344 #ifdef CONFIG_BLK_DEV_INITRD
 345         {
 346                 .ctl_name       = KERN_REALROOTDEV,
 347                 .procname       = "real-root-dev",
 348                 .data           = &real_root_dev,
 349                 .maxlen         = sizeof(int),
 350                 .mode           = 0644,
 351                 .proc_handler   = &proc_dointvec,
 352         },
 353 #endif
 354 #ifdef __sparc__
 355         {
 356                 .ctl_name       = KERN_SPARC_REBOOT,
 357                 .procname       = "reboot-cmd",
 358                 .data           = reboot_command,
 359                 .maxlen         = 256,
 360                 .mode           = 0644,
 361                 .proc_handler   = &proc_dostring,
 362                 .strategy       = &sysctl_string,
 363         },
 364         {
 365                 .ctl_name       = KERN_SPARC_STOP_A,
 366                 .procname       = "stop-a",
 367                 .data           = &stop_a_enabled,
 368                 .maxlen         = sizeof (int),
 369                 .mode           = 0644,
 370                 .proc_handler   = &proc_dointvec,
 371         },
 372         {
 373                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 374                 .procname       = "scons-poweroff",
 375                 .data           = &scons_pwroff,
 376                 .maxlen         = sizeof (int),
 377                 .mode           = 0644,
 378                 .proc_handler   = &proc_dointvec,
 379         },
 380 #endif
 381 #ifdef __hppa__
 382         {
 383                 .ctl_name       = KERN_HPPA_PWRSW,
 384                 .procname       = "soft-power",
 385                 .data           = &pwrsw_enabled,
 386                 .maxlen         = sizeof (int),
 387                 .mode           = 0644,
 388                 .proc_handler   = &proc_dointvec,
 389         },
 390         {
 391                 .ctl_name       = KERN_HPPA_UNALIGNED,
 392                 .procname       = "unaligned-trap",
 393                 .data           = &unaligned_enabled,
 394                 .maxlen         = sizeof (int),
 395                 .mode           = 0644,
 396                 .proc_handler   = &proc_dointvec,
 397         },
 398 #endif
 399         {
 400                 .ctl_name       = KERN_CTLALTDEL,
 401                 .procname       = "ctrl-alt-del",
 402                 .data           = &C_A_D,
 403                 .maxlen         = sizeof(int),
 404                 .mode           = 0644,
 405                 .proc_handler   = &proc_dointvec,
 406         },
 407         {
 408                 .ctl_name       = KERN_PRINTK,
 409                 .procname       = "printk",
 410                 .data           = &console_loglevel,
 411                 .maxlen         = 4*sizeof(int),
 412                 .mode           = 0644,
 413                 .proc_handler   = &proc_dointvec,
 414         },
 415 #ifdef CONFIG_KMOD
 416         {
 417                 .ctl_name       = KERN_MODPROBE,
 418                 .procname       = "modprobe",
 419                 .data           = &modprobe_path,
 420                 .maxlen         = KMOD_PATH_LEN,
 421                 .mode           = 0644,
 422                 .proc_handler   = &proc_dostring,
 423                 .strategy       = &sysctl_string,
 424         },
 425 #endif
 426 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 427         {
 428                 .ctl_name       = KERN_HOTPLUG,
 429                 .procname       = "hotplug",
 430                 .data           = &uevent_helper,
 431                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 432                 .mode           = 0644,
 433                 .proc_handler   = &proc_dostring,
 434                 .strategy       = &sysctl_string,
 435         },
 436 #endif
 437 #ifdef CONFIG_CHR_DEV_SG
 438         {
 439                 .ctl_name       = KERN_SG_BIG_BUFF,
 440                 .procname       = "sg-big-buff",
 441                 .data           = &sg_big_buff,
 442                 .maxlen         = sizeof (int),
 443                 .mode           = 0444,
 444                 .proc_handler   = &proc_dointvec,
 445         },
 446 #endif
 447 #ifdef CONFIG_BSD_PROCESS_ACCT
 448         {
 449                 .ctl_name       = KERN_ACCT,
 450                 .procname       = "acct",
 451                 .data           = &acct_parm,
 452                 .maxlen         = 3*sizeof(int),
 453                 .mode           = 0644,
 454                 .proc_handler   = &proc_dointvec,
 455         },
 456 #endif
 457 #ifdef CONFIG_SYSVIPC
 458         {
 459                 .ctl_name       = KERN_SHMMAX,
 460                 .procname       = "shmmax",
 461                 .data           = NULL,
 462                 .maxlen         = sizeof (size_t),
 463                 .mode           = 0644,
 464                 .proc_handler   = &proc_do_ipc_string,
 465         },
 466         {
 467                 .ctl_name       = KERN_SHMALL,
 468                 .procname       = "shmall",
 469                 .data           = NULL,
 470                 .maxlen         = sizeof (size_t),
 471                 .mode           = 0644,
 472                 .proc_handler   = &proc_do_ipc_string,
 473         },
 474         {
 475                 .ctl_name       = KERN_SHMMNI,
 476                 .procname       = "shmmni",
 477                 .data           = NULL,
 478                 .maxlen         = sizeof (int),
 479                 .mode           = 0644,
 480                 .proc_handler   = &proc_do_ipc_string,
 481         },
 482         {
 483                 .ctl_name       = KERN_MSGMAX,
 484                 .procname       = "msgmax",
 485                 .data           = NULL,
 486                 .maxlen         = sizeof (int),
 487                 .mode           = 0644,
 488                 .proc_handler   = &proc_do_ipc_string,
 489         },
 490         {
 491                 .ctl_name       = KERN_MSGMNI,
 492                 .procname       = "msgmni",
 493                 .data           = NULL,
 494                 .maxlen         = sizeof (int),
 495                 .mode           = 0644,
 496                 .proc_handler   = &proc_do_ipc_string,
 497         },
 498         {
 499                 .ctl_name       = KERN_MSGMNB,
 500                 .procname       =  "msgmnb",
 501                 .data           = NULL,
 502                 .maxlen         = sizeof (int),
 503                 .mode           = 0644,
 504                 .proc_handler   = &proc_do_ipc_string,
 505         },
 506         {
 507                 .ctl_name       = KERN_SEM,
 508                 .procname       = "sem",
 509                 .data           = NULL,
 510                 .maxlen         = 4*sizeof (int),
 511                 .mode           = 0644,
 512                 .proc_handler   = &proc_do_ipc_string,
 513         },
 514 #endif
 515 #ifdef CONFIG_MAGIC_SYSRQ
 516         {
 517                 .ctl_name       = KERN_SYSRQ,
 518                 .procname       = "sysrq",
 519                 .data           = &sysrq_enabled,
 520                 .maxlen         = sizeof (int),
 521                 .mode           = 0644,
 522                 .proc_handler   = &proc_dointvec,
 523         },
 524 #endif
 525 #ifdef CONFIG_PROC_SYSCTL
 526         {
 527                 .ctl_name       = KERN_CADPID,
 528                 .procname       = "cad_pid",
 529                 .data           = NULL,
 530                 .maxlen         = sizeof (int),
 531                 .mode           = 0600,
 532                 .proc_handler   = &proc_do_cad_pid,
 533         },
 534 #endif
 535         {
 536                 .ctl_name       = KERN_MAX_THREADS,
 537                 .procname       = "threads-max",
 538                 .data           = &max_threads,
 539                 .maxlen         = sizeof(int),
 540                 .mode           = 0644,
 541                 .proc_handler   = &proc_dointvec,
 542         },
 543         {
 544                 .ctl_name       = KERN_RANDOM,
 545                 .procname       = "random",
 546                 .mode           = 0555,
 547                 .child          = random_table,
 548         },
 549 #ifdef CONFIG_UNIX98_PTYS
 550         {
 551                 .ctl_name       = KERN_PTY,
 552                 .procname       = "pty",
 553                 .mode           = 0555,
 554                 .child          = pty_table,
 555         },
 556 #endif
 557         {
 558                 .ctl_name       = KERN_OVERFLOWUID,
 559                 .procname       = "overflowuid",
 560                 .data           = &overflowuid,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec_minmax,
 564                 .strategy       = &sysctl_intvec,
 565                 .extra1         = &minolduid,
 566                 .extra2         = &maxolduid,
 567         },
 568         {
 569                 .ctl_name       = KERN_OVERFLOWGID,
 570                 .procname       = "overflowgid",
 571                 .data           = &overflowgid,
 572                 .maxlen         = sizeof(int),
 573                 .mode           = 0644,
 574                 .proc_handler   = &proc_dointvec_minmax,
 575                 .strategy       = &sysctl_intvec,
 576                 .extra1         = &minolduid,
 577                 .extra2         = &maxolduid,
 578         },
 579 #ifdef CONFIG_S390
 580 #ifdef CONFIG_MATHEMU
 581         {
 582                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 583                 .procname       = "ieee_emulation_warnings",
 584                 .data           = &sysctl_ieee_emulation_warnings,
 585                 .maxlen         = sizeof(int),
 586                 .mode           = 0644,
 587                 .proc_handler   = &proc_dointvec,
 588         },
 589 #endif
 590 #ifdef CONFIG_NO_IDLE_HZ
 591         {
 592                 .ctl_name       = KERN_HZ_TIMER,
 593                 .procname       = "hz_timer",
 594                 .data           = &sysctl_hz_timer,
 595                 .maxlen         = sizeof(int),
 596                 .mode           = 0644,
 597                 .proc_handler   = &proc_dointvec,
 598         },
 599 #endif
 600         {
 601                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 602                 .procname       = "userprocess_debug",
 603                 .data           = &sysctl_userprocess_debug,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec,
 607         },
 608 #endif
 609         {
 610                 .ctl_name       = KERN_PIDMAX,
 611                 .procname       = "pid_max",
 612                 .data           = &pid_max,
 613                 .maxlen         = sizeof (int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec_minmax,
 616                 .strategy       = sysctl_intvec,
 617                 .extra1         = &pid_max_min,
 618                 .extra2         = &pid_max_max,
 619         },
 620         {
 621                 .ctl_name       = KERN_PANIC_ON_OOPS,
 622                 .procname       = "panic_on_oops",
 623                 .data           = &panic_on_oops,
 624                 .maxlen         = sizeof(int),
 625                 .mode           = 0644,
 626                 .proc_handler   = &proc_dointvec,
 627         },
 628         {
 629                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 630                 .procname       = "printk_ratelimit",
 631                 .data           = &printk_ratelimit_jiffies,
 632                 .maxlen         = sizeof(int),
 633                 .mode           = 0644,
 634                 .proc_handler   = &proc_dointvec_jiffies,
 635                 .strategy       = &sysctl_jiffies,
 636         },
 637         {
 638                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 639                 .procname       = "printk_ratelimit_burst",
 640                 .data           = &printk_ratelimit_burst,
 641                 .maxlen         = sizeof(int),
 642                 .mode           = 0644,
 643                 .proc_handler   = &proc_dointvec,
 644         },
 645         {
 646                 .ctl_name       = KERN_NGROUPS_MAX,
 647                 .procname       = "ngroups_max",
 648                 .data           = &ngroups_max,
 649                 .maxlen         = sizeof (int),
 650                 .mode           = 0444,
 651                 .proc_handler   = &proc_dointvec,
 652         },
 653 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 654         {
 655                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 656                 .procname       = "unknown_nmi_panic",
 657                 .data           = &unknown_nmi_panic,
 658                 .maxlen         = sizeof (int),
 659                 .mode           = 0644,
 660                 .proc_handler   = &proc_dointvec,
 661         },
 662         {
 663                 .ctl_name       = KERN_NMI_WATCHDOG,
 664                 .procname       = "nmi_watchdog",
 665                 .data           = &nmi_watchdog_enabled,
 666                 .maxlen         = sizeof (int),
 667                 .mode           = 0644,
 668                 .proc_handler   = &proc_nmi_enabled,
 669         },
 670 #endif
 671 #if defined(CONFIG_X86)
 672         {
 673                 .ctl_name       = KERN_PANIC_ON_NMI,
 674                 .procname       = "panic_on_unrecovered_nmi",
 675                 .data           = &panic_on_unrecovered_nmi,
 676                 .maxlen         = sizeof(int),
 677                 .mode           = 0644,
 678                 .proc_handler   = &proc_dointvec,
 679         },
 680         {
 681                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 682                 .procname       = "bootloader_type",
 683                 .data           = &bootloader_type,
 684                 .maxlen         = sizeof (int),
 685                 .mode           = 0444,
 686                 .proc_handler   = &proc_dointvec,
 687         },
 688         {
 689                 .ctl_name       = CTL_UNNUMBERED,
 690                 .procname       = "kstack_depth_to_print",
 691                 .data           = &kstack_depth_to_print,
 692                 .maxlen         = sizeof(int),
 693                 .mode           = 0644,
 694                 .proc_handler   = &proc_dointvec,
 695         },
 696 #endif
 697 #if defined(CONFIG_MMU)
 698         {
 699                 .ctl_name       = KERN_RANDOMIZE,
 700                 .procname       = "randomize_va_space",
 701                 .data           = &randomize_va_space,
 702                 .maxlen         = sizeof(int),
 703                 .mode           = 0644,
 704                 .proc_handler   = &proc_dointvec,
 705         },
 706 #endif
 707 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 708         {
 709                 .ctl_name       = KERN_SPIN_RETRY,
 710                 .procname       = "spin_retry",
 711                 .data           = &spin_retry,
 712                 .maxlen         = sizeof (int),
 713                 .mode           = 0644,
 714                 .proc_handler   = &proc_dointvec,
 715         },
 716 #endif
 717 #ifdef CONFIG_ACPI_SLEEP
 718         {
 719                 .ctl_name       = KERN_ACPI_VIDEO_FLAGS,
 720                 .procname       = "acpi_video_flags",
 721                 .data           = &acpi_video_flags,
 722                 .maxlen         = sizeof (unsigned long),
 723                 .mode           = 0644,
 724                 .proc_handler   = &proc_doulongvec_minmax,
 725         },
 726 #endif
 727 #ifdef CONFIG_IA64
 728         {
 729                 .ctl_name       = KERN_IA64_UNALIGNED,
 730                 .procname       = "ignore-unaligned-usertrap",
 731                 .data           = &no_unaligned_warning,
 732                 .maxlen         = sizeof (int),
 733                 .mode           = 0644,
 734                 .proc_handler   = &proc_dointvec,
 735         },
 736 #endif
 737 #ifdef CONFIG_COMPAT
 738         {
 739                 .ctl_name       = KERN_COMPAT_LOG,
 740                 .procname       = "compat-log",
 741                 .data           = &compat_log,
 742                 .maxlen         = sizeof (int),
 743                 .mode           = 0644,
 744                 .proc_handler   = &proc_dointvec,
 745         },
 746 #endif
 747 #ifdef CONFIG_RT_MUTEXES
 748         {
 749                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 750                 .procname       = "max_lock_depth",
 751                 .data           = &max_lock_depth,
 752                 .maxlen         = sizeof(int),
 753                 .mode           = 0644,
 754                 .proc_handler   = &proc_dointvec,
 755         },
 756 #endif
 757
 758         { .ctl_name = 0 }
 759 };
 760
 761 /* Constants for minimum and maximum testing in vm_table.
 762    We use these as one-element integer vectors. */
 763 static int zero;
 764 static int one_hundred = 100;
 765
 766
 767 static ctl_table vm_table[] = {
 768         {
 769                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 770                 .procname       = "overcommit_memory",
 771                 .data           = &sysctl_overcommit_memory,
 772                 .maxlen         = sizeof(sysctl_overcommit_memory),
 773                 .mode           = 0644,
 774                 .proc_handler   = &proc_dointvec,
 775         },
 776         {
 777                 .ctl_name       = VM_PANIC_ON_OOM,
 778                 .procname       = "panic_on_oom",
 779                 .data           = &sysctl_panic_on_oom,
 780                 .maxlen         = sizeof(sysctl_panic_on_oom),
 781                 .mode           = 0644,
 782                 .proc_handler   = &proc_dointvec,
 783         },
 784         {
 785                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 786                 .procname       = "overcommit_ratio",
 787                 .data           = &sysctl_overcommit_ratio,
 788                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 789                 .mode           = 0644,
 790                 .proc_handler   = &proc_dointvec,
 791         },
 792         {
 793                 .ctl_name       = VM_PAGE_CLUSTER,
 794                 .procname       = "page-cluster",
 795                 .data           = &page_cluster,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = &proc_dointvec,
 799         },
 800         {
 801                 .ctl_name       = VM_DIRTY_BACKGROUND,
 802                 .procname       = "dirty_background_ratio",
 803                 .data           = &dirty_background_ratio,
 804                 .maxlen         = sizeof(dirty_background_ratio),
 805                 .mode           = 0644,
 806                 .proc_handler   = &proc_dointvec_minmax,
 807                 .strategy       = &sysctl_intvec,
 808                 .extra1         = &zero,
 809                 .extra2         = &one_hundred,
 810         },
 811         {
 812                 .ctl_name       = VM_DIRTY_RATIO,
 813                 .procname       = "dirty_ratio",
 814                 .data           = &vm_dirty_ratio,
 815                 .maxlen         = sizeof(vm_dirty_ratio),
 816                 .mode           = 0644,
 817                 .proc_handler   = &proc_dointvec_minmax,
 818                 .strategy       = &sysctl_intvec,
 819                 .extra1         = &zero,
 820                 .extra2         = &one_hundred,
 821         },
 822         {
 823                 .ctl_name       = VM_DIRTY_WB_CS,
 824                 .procname       = "dirty_writeback_centisecs",
 825                 .data           = &dirty_writeback_interval,
 826                 .maxlen         = sizeof(dirty_writeback_interval),
 827                 .mode           = 0644,
 828                 .proc_handler   = &dirty_writeback_centisecs_handler,
 829         },
 830         {
 831                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
 832                 .procname       = "dirty_expire_centisecs",
 833                 .data           = &dirty_expire_interval,
 834                 .maxlen         = sizeof(dirty_expire_interval),
 835                 .mode           = 0644,
 836                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 837         },
 838         {
 839                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 840                 .procname       = "nr_pdflush_threads",
 841                 .data           = &nr_pdflush_threads,
 842                 .maxlen         = sizeof nr_pdflush_threads,
 843                 .mode           = 0444 /* read-only*/,
 844                 .proc_handler   = &proc_dointvec,
 845         },
 846         {
 847                 .ctl_name       = VM_SWAPPINESS,
 848                 .procname       = "swappiness",
 849                 .data           = &vm_swappiness,
 850                 .maxlen         = sizeof(vm_swappiness),
 851                 .mode           = 0644,
 852                 .proc_handler   = &proc_dointvec_minmax,
 853                 .strategy       = &sysctl_intvec,
 854                 .extra1         = &zero,
 855                 .extra2         = &one_hundred,
 856         },
 857 #ifdef CONFIG_HUGETLB_PAGE
 858          {
 859                 .ctl_name       = VM_HUGETLB_PAGES,
 860                 .procname       = "nr_hugepages",
 861                 .data           = &max_huge_pages,
 862                 .maxlen         = sizeof(unsigned long),
 863                 .mode           = 0644,
 864                 .proc_handler   = &hugetlb_sysctl_handler,
 865                 .extra1         = (void *)&hugetlb_zero,
 866                 .extra2         = (void *)&hugetlb_infinity,
 867          },
 868          {
 869                 .ctl_name       = VM_HUGETLB_GROUP,
 870                 .procname       = "hugetlb_shm_group",
 871                 .data           = &sysctl_hugetlb_shm_group,
 872                 .maxlen         = sizeof(gid_t),
 873                 .mode           = 0644,
 874                 .proc_handler   = &proc_dointvec,
 875          },
 876 #endif
 877         {
 878                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 879                 .procname       = "lowmem_reserve_ratio",
 880                 .data           = &sysctl_lowmem_reserve_ratio,
 881                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 882                 .mode           = 0644,
 883                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 884                 .strategy       = &sysctl_intvec,
 885         },
 886         {
 887                 .ctl_name       = VM_DROP_PAGECACHE,
 888                 .procname       = "drop_caches",
 889                 .data           = &sysctl_drop_caches,
 890                 .maxlen         = sizeof(int),
 891                 .mode           = 0644,
 892                 .proc_handler   = drop_caches_sysctl_handler,
 893                 .strategy       = &sysctl_intvec,
 894         },
 895         {
 896                 .ctl_name       = VM_MIN_FREE_KBYTES,
 897                 .procname       = "min_free_kbytes",
 898                 .data           = &min_free_kbytes,
 899                 .maxlen         = sizeof(min_free_kbytes),
 900                 .mode           = 0644,
 901                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 902                 .strategy       = &sysctl_intvec,
 903                 .extra1         = &zero,
 904         },
 905         {
 906                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 907                 .procname       = "percpu_pagelist_fraction",
 908                 .data           = &percpu_pagelist_fraction,
 909                 .maxlen         = sizeof(percpu_pagelist_fraction),
 910                 .mode           = 0644,
 911                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 912                 .strategy       = &sysctl_intvec,
 913                 .extra1         = &min_percpu_pagelist_fract,
 914         },
 915 #ifdef CONFIG_MMU
 916         {
 917                 .ctl_name       = VM_MAX_MAP_COUNT,
 918                 .procname       = "max_map_count",
 919                 .data           = &sysctl_max_map_count,
 920                 .maxlen         = sizeof(sysctl_max_map_count),
 921                 .mode           = 0644,
 922                 .proc_handler   = &proc_dointvec
 923         },
 924 #endif
 925         {
 926                 .ctl_name       = VM_LAPTOP_MODE,
 927                 .procname       = "laptop_mode",
 928                 .data           = &laptop_mode,
 929                 .maxlen         = sizeof(laptop_mode),
 930                 .mode           = 0644,
 931                 .proc_handler   = &proc_dointvec_jiffies,
 932                 .strategy       = &sysctl_jiffies,
 933         },
 934         {
 935                 .ctl_name       = VM_BLOCK_DUMP,
 936                 .procname       = "block_dump",
 937                 .data           = &block_dump,
 938                 .maxlen         = sizeof(block_dump),
 939                 .mode           = 0644,
 940                 .proc_handler   = &proc_dointvec,
 941                 .strategy       = &sysctl_intvec,
 942                 .extra1         = &zero,
 943         },
 944         {
 945                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 946                 .procname       = "vfs_cache_pressure",
 947                 .data           = &sysctl_vfs_cache_pressure,
 948                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 949                 .mode           = 0644,
 950                 .proc_handler   = &proc_dointvec,
 951                 .strategy       = &sysctl_intvec,
 952                 .extra1         = &zero,
 953         },
 954 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 955         {
 956                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 957                 .procname       = "legacy_va_layout",
 958                 .data           = &sysctl_legacy_va_layout,
 959                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 960                 .mode           = 0644,
 961                 .proc_handler   = &proc_dointvec,
 962                 .strategy       = &sysctl_intvec,
 963                 .extra1         = &zero,
 964         },
 965 #endif
 966 #ifdef CONFIG_NUMA
 967         {
 968                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
 969                 .procname       = "zone_reclaim_mode",
 970                 .data           = &zone_reclaim_mode,
 971                 .maxlen         = sizeof(zone_reclaim_mode),
 972                 .mode           = 0644,
 973                 .proc_handler   = &proc_dointvec,
 974                 .strategy       = &sysctl_intvec,
 975                 .extra1         = &zero,
 976         },
 977         {
 978                 .ctl_name       = VM_MIN_UNMAPPED,
 979                 .procname       = "min_unmapped_ratio",
 980                 .data           = &sysctl_min_unmapped_ratio,
 981                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
 982                 .mode           = 0644,
 983                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
 984                 .strategy       = &sysctl_intvec,
 985                 .extra1         = &zero,
 986                 .extra2         = &one_hundred,
 987         },
 988         {
 989                 .ctl_name       = VM_MIN_SLAB,
 990                 .procname       = "min_slab_ratio",
 991                 .data           = &sysctl_min_slab_ratio,
 992                 .maxlen         = sizeof(sysctl_min_slab_ratio),
 993                 .mode           = 0644,
 994                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
 995                 .strategy       = &sysctl_intvec,
 996                 .extra1         = &zero,
 997                 .extra2         = &one_hundred,
 998         },
 999 #endif
1000 #ifdef CONFIG_X86_32
1001         {
1002                 .ctl_name       = VM_VDSO_ENABLED,
1003                 .procname       = "vdso_enabled",
1004                 .data           = &vdso_enabled,
1005                 .maxlen         = sizeof(vdso_enabled),
1006                 .mode           = 0644,
1007                 .proc_handler   = &proc_dointvec,
1008                 .strategy       = &sysctl_intvec,
1009                 .extra1         = &zero,
1010         },
1011 #endif
1012         { .ctl_name = 0 }
1013 };
1014
1015 static ctl_table fs_table[] = {
1016         {
1017                 .ctl_name       = FS_NRINODE,
1018                 .procname       = "inode-nr",
1019                 .data           = &inodes_stat,
1020                 .maxlen         = 2*sizeof(int),
1021                 .mode           = 0444,
1022                 .proc_handler   = &proc_dointvec,
1023         },
1024         {
1025                 .ctl_name       = FS_STATINODE,
1026                 .procname       = "inode-state",
1027                 .data           = &inodes_stat,
1028                 .maxlen         = 7*sizeof(int),
1029                 .mode           = 0444,
1030                 .proc_handler   = &proc_dointvec,
1031         },
1032         {
1033                 .ctl_name       = FS_NRFILE,
1034                 .procname       = "file-nr",
1035                 .data           = &files_stat,
1036                 .maxlen         = 3*sizeof(int),
1037                 .mode           = 0444,
1038                 .proc_handler   = &proc_nr_files,
1039         },
1040         {
1041                 .ctl_name       = FS_MAXFILE,
1042                 .procname       = "file-max",
1043                 .data           = &files_stat.max_files,
1044                 .maxlen         = sizeof(int),
1045                 .mode           = 0644,
1046                 .proc_handler   = &proc_dointvec,
1047         },
1048         {
1049                 .ctl_name       = FS_DENTRY,
1050                 .procname       = "dentry-state",
1051                 .data           = &dentry_stat,
1052                 .maxlen         = 6*sizeof(int),
1053                 .mode           = 0444,
1054                 .proc_handler   = &proc_dointvec,
1055         },
1056         {
1057                 .ctl_name       = FS_OVERFLOWUID,
1058                 .procname       = "overflowuid",
1059                 .data           = &fs_overflowuid,
1060                 .maxlen         = sizeof(int),
1061                 .mode           = 0644,
1062                 .proc_handler   = &proc_dointvec_minmax,
1063                 .strategy       = &sysctl_intvec,
1064                 .extra1         = &minolduid,
1065                 .extra2         = &maxolduid,
1066         },
1067         {
1068                 .ctl_name       = FS_OVERFLOWGID,
1069                 .procname       = "overflowgid",
1070                 .data           = &fs_overflowgid,
1071                 .maxlen         = sizeof(int),
1072                 .mode           = 0644,
1073                 .proc_handler   = &proc_dointvec_minmax,
1074                 .strategy       = &sysctl_intvec,
1075                 .extra1         = &minolduid,
1076                 .extra2         = &maxolduid,
1077         },
1078         {
1079                 .ctl_name       = FS_LEASES,
1080                 .procname       = "leases-enable",
1081                 .data           = &leases_enable,
1082                 .maxlen         = sizeof(int),
1083                 .mode           = 0644,
1084                 .proc_handler   = &proc_dointvec,
1085         },
1086 #ifdef CONFIG_DNOTIFY
1087         {
1088                 .ctl_name       = FS_DIR_NOTIFY,
1089                 .procname       = "dir-notify-enable",
1090                 .data           = &dir_notify_enable,
1091                 .maxlen         = sizeof(int),
1092                 .mode           = 0644,
1093                 .proc_handler   = &proc_dointvec,
1094         },
1095 #endif
1096 #ifdef CONFIG_MMU
1097         {
1098                 .ctl_name       = FS_LEASE_TIME,
1099                 .procname       = "lease-break-time",
1100                 .data           = &lease_break_time,
1101                 .maxlen         = sizeof(int),
1102                 .mode           = 0644,
1103                 .proc_handler   = &proc_dointvec,
1104         },
1105         {
1106                 .ctl_name       = FS_AIO_NR,
1107                 .procname       = "aio-nr",
1108                 .data           = &aio_nr,
1109                 .maxlen         = sizeof(aio_nr),
1110                 .mode           = 0444,
1111                 .proc_handler   = &proc_doulongvec_minmax,
1112         },
1113         {
1114                 .ctl_name       = FS_AIO_MAX_NR,
1115                 .procname       = "aio-max-nr",
1116                 .data           = &aio_max_nr,
1117                 .maxlen         = sizeof(aio_max_nr),
1118                 .mode           = 0644,
1119                 .proc_handler   = &proc_doulongvec_minmax,
1120         },
1121 #ifdef CONFIG_INOTIFY_USER
1122         {
1123                 .ctl_name       = FS_INOTIFY,
1124                 .procname       = "inotify",
1125                 .mode           = 0555,
1126                 .child          = inotify_table,
1127         },
1128 #endif
1129 #endif
1130         {
1131                 .ctl_name       = KERN_SETUID_DUMPABLE,
1132                 .procname       = "suid_dumpable",
1133                 .data           = &suid_dumpable,
1134                 .maxlen         = sizeof(int),
1135                 .mode           = 0644,
1136                 .proc_handler   = &proc_dointvec,
1137         },
1138         { .ctl_name = 0 }
1139 };
1140
1141 static ctl_table debug_table[] = {
1142         { .ctl_name = 0 }
1143 };
1144
1145 static ctl_table dev_table[] = {
1146         { .ctl_name = 0 }
1147 };
1148
1149 extern void init_irq_proc (void);
1150
1151 static DEFINE_SPINLOCK(sysctl_lock);
1152
1153 /* called under sysctl_lock */
1154 static int use_table(struct ctl_table_header *p)
1155 {
1156         if (unlikely(p->unregistering))
1157                 return 0;
1158         p->used++;
1159         return 1;
1160 }
1161
1162 /* called under sysctl_lock */
1163 static void unuse_table(struct ctl_table_header *p)
1164 {
1165         if (!--p->used)
1166                 if (unlikely(p->unregistering))
1167                         complete(p->unregistering);
1168 }
1169
1170 /* called under sysctl_lock, will reacquire if has to wait */
1171 static void start_unregistering(struct ctl_table_header *p)
1172 {
1173         /*
1174          * if p->used is 0, nobody will ever touch that entry again;
1175          * we'll eliminate all paths to it before dropping sysctl_lock
1176          */
1177         if (unlikely(p->used)) {
1178                 struct completion wait;
1179                 init_completion(&wait);
1180                 p->unregistering = &wait;
1181                 spin_unlock(&sysctl_lock);
1182                 wait_for_completion(&wait);
1183                 spin_lock(&sysctl_lock);
1184         }
1185         /*
1186          * do not remove from the list until nobody holds it; walking the
1187          * list in do_sysctl() relies on that.
1188          */
1189         list_del_init(&p->ctl_entry);
1190 }
1191
1192 void __init sysctl_init(void)
1193 {
1194 #ifdef CONFIG_PROC_SYSCTL
1195         register_proc_table(root_table, proc_sys_root, &root_table_header);
1196         init_irq_proc();
1197 #endif
1198 }
1199
1200 #ifdef CONFIG_SYSCTL_SYSCALL
1201 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1202                void __user *newval, size_t newlen)
1203 {
1204         struct list_head *tmp;
1205         int error = -ENOTDIR;
1206
1207         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1208                 return -ENOTDIR;
1209         if (oldval) {
1210                 int old_len;
1211                 if (!oldlenp || get_user(old_len, oldlenp))
1212                         return -EFAULT;
1213         }
1214         spin_lock(&sysctl_lock);
1215         tmp = &root_table_header.ctl_entry;
1216         do {
1217                 struct ctl_table_header *head =
1218                         list_entry(tmp, struct ctl_table_header, ctl_entry);
1219                 void *context = NULL;
1220
1221                 if (!use_table(head))
1222                         continue;
1223
1224                 spin_unlock(&sysctl_lock);
1225
1226                 error = parse_table(name, nlen, oldval, oldlenp,
1227                                         newval, newlen, head->ctl_table,
1228                                         &context);
1229                 kfree(context);
1230
1231                 spin_lock(&sysctl_lock);
1232                 unuse_table(head);
1233                 if (error != -ENOTDIR)
1234                         break;
1235         } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1236         spin_unlock(&sysctl_lock);
1237         return error;
1238 }
1239
1240 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1241 {
1242         struct __sysctl_args tmp;
1243         int error;
1244
1245         if (copy_from_user(&tmp, args, sizeof(tmp)))
1246                 return -EFAULT;
1247
1248         lock_kernel();
1249         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1250                           tmp.newval, tmp.newlen);
1251         unlock_kernel();
1252         return error;
1253 }
1254 #endif /* CONFIG_SYSCTL_SYSCALL */
1255
1256 /*
1257  * ctl_perm does NOT grant the superuser all rights automatically, because
1258  * some sysctl variables are readonly even to root.
1259  */
1260
1261 static int test_perm(int mode, int op)
1262 {
1263         if (!current->euid)
1264                 mode >>= 6;
1265         else if (in_egroup_p(0))
1266                 mode >>= 3;
1267         if ((mode & op & 0007) == op)
1268                 return 0;
1269         return -EACCES;
1270 }
1271
1272 static inline int ctl_perm(ctl_table *table, int op)
1273 {
1274         int error;
1275         error = security_sysctl(table, op);
1276         if (error)
1277                 return error;
1278         return test_perm(table->mode, op);
1279 }
1280
1281 #ifdef CONFIG_SYSCTL_SYSCALL
1282 static int parse_table(int __user *name, int nlen,
1283                        void __user *oldval, size_t __user *oldlenp,
1284                        void __user *newval, size_t newlen,
1285                        ctl_table *table, void **context)
1286 {
1287         int n;
1288 repeat:
1289         if (!nlen)
1290                 return -ENOTDIR;
1291         if (get_user(n, name))
1292                 return -EFAULT;
1293         for ( ; table->ctl_name || table->procname; table++) {
1294                 if (!table->ctl_name)
1295                         continue;
1296                 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1297                         int error;
1298                         if (table->child) {
1299                                 if (ctl_perm(table, 001))
1300                                         return -EPERM;
1301                                 if (table->strategy) {
1302                                         error = table->strategy(
1303                                                 table, name, nlen,
1304                                                 oldval, oldlenp,
1305                                                 newval, newlen, context);
1306                                         if (error)
1307                                                 return error;
1308                                 }
1309                                 name++;
1310                                 nlen--;
1311                                 table = table->child;
1312                                 goto repeat;
1313                         }
1314                         error = do_sysctl_strategy(table, name, nlen,
1315                                                    oldval, oldlenp,
1316                                                    newval, newlen, context);
1317                         return error;
1318                 }
1319         }
1320         return -ENOTDIR;
1321 }
1322
1323 /* Perform the actual read/write of a sysctl table entry. */
1324 int do_sysctl_strategy (ctl_table *table,
1325                         int __user *name, int nlen,
1326                         void __user *oldval, size_t __user *oldlenp,
1327                         void __user *newval, size_t newlen, void **context)
1328 {
1329         int op = 0, rc;
1330         size_t len;
1331
1332         if (oldval)
1333                 op |= 004;
1334         if (newval)
1335                 op |= 002;
1336         if (ctl_perm(table, op))
1337                 return -EPERM;
1338
1339         if (table->strategy) {
1340                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1341                                      newval, newlen, context);
1342                 if (rc < 0)
1343                         return rc;
1344                 if (rc > 0)
1345                         return 0;
1346         }
1347
1348         /* If there is no strategy routine, or if the strategy returns
1349          * zero, proceed with automatic r/w */
1350         if (table->data && table->maxlen) {
1351                 if (oldval && oldlenp) {
1352                         if (get_user(len, oldlenp))
1353                                 return -EFAULT;
1354                         if (len) {
1355                                 if (len > table->maxlen)
1356                                         len = table->maxlen;
1357                                 if(copy_to_user(oldval, table->data, len))
1358                                         return -EFAULT;
1359                                 if(put_user(len, oldlenp))
1360                                         return -EFAULT;
1361                         }
1362                 }
1363                 if (newval && newlen) {
1364                         len = newlen;
1365                         if (len > table->maxlen)
1366                                 len = table->maxlen;
1367                         if(copy_from_user(table->data, newval, len))
1368                                 return -EFAULT;
1369                 }
1370         }
1371         return 0;
1372 }
1373 #endif /* CONFIG_SYSCTL_SYSCALL */
1374
1375 /**
1376  * register_sysctl_table - register a sysctl hierarchy
1377  * @table: the top-level table structure
1378  * @insert_at_head: whether the entry should be inserted in front or at the end
1379  *
1380  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1381  * array. An entry with a ctl_name of 0 terminates the table.
1382  *
1383  * The members of the &ctl_table structure are used as follows:
1384  *
1385  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1386  *            must be unique within that level of sysctl
1387  *
1388  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1389  *            enter a sysctl file
1390  *
1391  * data - a pointer to data for use by proc_handler
1392  *
1393  * maxlen - the maximum size in bytes of the data
1394  *
1395  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1396  *
1397  * child - a pointer to the child sysctl table if this entry is a directory, or
1398  *         %NULL.
1399  *
1400  * proc_handler - the text handler routine (described below)
1401  *
1402  * strategy - the strategy routine (described below)
1403  *
1404  * de - for internal use by the sysctl routines
1405  *
1406  * extra1, extra2 - extra pointers usable by the proc handler routines
1407  *
1408  * Leaf nodes in the sysctl tree will be represented by a single file
1409  * under /proc; non-leaf nodes will be represented by directories.
1410  *
1411  * sysctl(2) can automatically manage read and write requests through
1412  * the sysctl table.  The data and maxlen fields of the ctl_table
1413  * struct enable minimal validation of the values being written to be
1414  * performed, and the mode field allows minimal authentication.
1415  *
1416  * More sophisticated management can be enabled by the provision of a
1417  * strategy routine with the table entry.  This will be called before
1418  * any automatic read or write of the data is performed.
1419  *
1420  * The strategy routine may return
1421  *
1422  * < 0 - Error occurred (error is passed to user process)
1423  *
1424  * 0   - OK - proceed with automatic read or write.
1425  *
1426  * > 0 - OK - read or write has been done by the strategy routine, so
1427  *       return immediately.
1428  *
1429  * There must be a proc_handler routine for any terminal nodes
1430  * mirrored under /proc/sys (non-terminals are handled by a built-in
1431  * directory handler).  Several default handlers are available to
1432  * cover common cases -
1433  *
1434  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1435  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1436  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1437  *
1438  * It is the handler's job to read the input buffer from user memory
1439  * and process it. The handler should return 0 on success.
1440  *
1441  * This routine returns %NULL on a failure to register, and a pointer
1442  * to the table header on success.
1443  */
1444 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1445                                                int insert_at_head)
1446 {
1447         struct ctl_table_header *tmp;
1448         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1449         if (!tmp)
1450                 return NULL;
1451         tmp->ctl_table = table;
1452         INIT_LIST_HEAD(&tmp->ctl_entry);
1453         tmp->used = 0;
1454         tmp->unregistering = NULL;
1455         spin_lock(&sysctl_lock);
1456         if (insert_at_head)
1457                 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1458         else
1459                 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1460         spin_unlock(&sysctl_lock);
1461 #ifdef CONFIG_PROC_SYSCTL
1462         register_proc_table(table, proc_sys_root, tmp);
1463 #endif
1464         return tmp;
1465 }
1466
1467 /**
1468  * unregister_sysctl_table - unregister a sysctl table hierarchy
1469  * @header: the header returned from register_sysctl_table
1470  *
1471  * Unregisters the sysctl table and all children. proc entries may not
1472  * actually be removed until they are no longer used by anyone.
1473  */
1474 void unregister_sysctl_table(struct ctl_table_header * header)
1475 {
1476         might_sleep();
1477         spin_lock(&sysctl_lock);
1478         start_unregistering(header);
1479 #ifdef CONFIG_PROC_SYSCTL
1480         unregister_proc_table(header->ctl_table, proc_sys_root);
1481 #endif
1482         spin_unlock(&sysctl_lock);
1483         kfree(header);
1484 }
1485
1486 #else /* !CONFIG_SYSCTL */
1487 struct ctl_table_header * register_sysctl_table(ctl_table * table,
1488                                                 int insert_at_head)
1489 {
1490         return NULL;
1491 }
1492
1493 void unregister_sysctl_table(struct ctl_table_header * table)
1494 {
1495 }
1496
1497 #endif /* CONFIG_SYSCTL */
1498
1499 /*
1500  * /proc/sys support
1501  */
1502
1503 #ifdef CONFIG_PROC_SYSCTL
1504
1505 /* Scan the sysctl entries in table and add them all into /proc */
1506 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1507 {
1508         struct proc_dir_entry *de;
1509         int len;
1510         mode_t mode;
1511
1512         for (; table->ctl_name || table->procname; table++) {
1513                 /* Can't do anything without a proc name. */
1514                 if (!table->procname)
1515                         continue;
1516                 /* Maybe we can't do anything with it... */
1517                 if (!table->proc_handler && !table->child) {
1518                         printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1519                                 table->procname);
1520                         continue;
1521                 }
1522
1523                 len = strlen(table->procname);
1524                 mode = table->mode;
1525
1526                 de = NULL;
1527                 if (table->proc_handler)
1528                         mode |= S_IFREG;
1529                 else {
1530                         mode |= S_IFDIR;
1531                         for (de = root->subdir; de; de = de->next) {
1532                                 if (proc_match(len, table->procname, de))
1533                                         break;
1534                         }
1535                         /* If the subdir exists already, de is non-NULL */
1536                 }
1537
1538                 if (!de) {
1539                         de = create_proc_entry(table->procname, mode, root);
1540                         if (!de)
1541                                 continue;
1542                         de->set = set;
1543                         de->data = (void *) table;
1544                         if (table->proc_handler)
1545                                 de->proc_fops = &proc_sys_file_operations;
1546                 }
1547                 table->de = de;
1548                 if (de->mode & S_IFDIR)
1549                         register_proc_table(table->child, de, set);
1550         }
1551 }
1552
1553 /*
1554  * Unregister a /proc sysctl table and any subdirectories.
1555  */
1556 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1557 {
1558         struct proc_dir_entry *de;
1559         for (; table->ctl_name || table->procname; table++) {
1560                 if (!(de = table->de))
1561                         continue;
1562                 if (de->mode & S_IFDIR) {
1563                         if (!table->child) {
1564                                 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1565                                 continue;
1566                         }
1567                         unregister_proc_table(table->child, de);
1568
1569                         /* Don't unregister directories which still have entries.. */
1570                         if (de->subdir)
1571                                 continue;
1572                 }
1573
1574                 /*
1575                  * In any case, mark the entry as goner; we'll keep it
1576                  * around if it's busy, but we'll know to do nothing with
1577                  * its fields.  We are under sysctl_lock here.
1578                  */
1579                 de->data = NULL;
1580
1581                 /* Don't unregister proc entries that are still being used.. */
1582                 if (atomic_read(&de->count))
1583                         continue;
1584
1585                 table->de = NULL;
1586                 remove_proc_entry(table->procname, root);
1587         }
1588 }
1589
1590 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1591                           size_t count, loff_t *ppos)
1592 {
1593         int op;
1594         struct proc_dir_entry *de = PDE(file->f_path.dentry->d_inode);
1595         struct ctl_table *table;
1596         size_t res;
1597         ssize_t error = -ENOTDIR;
1598
1599         spin_lock(&sysctl_lock);
1600         if (de && de->data && use_table(de->set)) {
1601                 /*
1602                  * at that point we know that sysctl was not unregistered
1603                  * and won't be until we finish
1604                  */
1605                 spin_unlock(&sysctl_lock);
1606                 table = (struct ctl_table *) de->data;
1607                 if (!table || !table->proc_handler)
1608                         goto out;
1609                 error = -EPERM;
1610                 op = (write ? 002 : 004);
1611                 if (ctl_perm(table, op))
1612                         goto out;
1613
1614                 /* careful: calling conventions are nasty here */
1615                 res = count;
1616                 error = (*table->proc_handler)(table, write, file,
1617                                                 buf, &res, ppos);
1618                 if (!error)
1619                         error = res;
1620         out:
1621                 spin_lock(&sysctl_lock);
1622                 unuse_table(de->set);
1623         }
1624         spin_unlock(&sysctl_lock);
1625         return error;
1626 }
1627
1628 static int proc_opensys(struct inode *inode, struct file *file)
1629 {
1630         if (file->f_mode & FMODE_WRITE) {
1631                 /*
1632                  * sysctl entries that are not writable,
1633                  * are _NOT_ writable, capabilities or not.
1634                  */
1635                 if (!(inode->i_mode & S_IWUSR))
1636                         return -EPERM;
1637         }
1638
1639         return 0;
1640 }
1641
1642 static ssize_t proc_readsys(struct file * file, char __user * buf,
1643                             size_t count, loff_t *ppos)
1644 {
1645         return do_rw_proc(0, file, buf, count, ppos);
1646 }
1647
1648 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1649                              size_t count, loff_t *ppos)
1650 {
1651         return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1652 }
1653
1654 static int _proc_do_string(void* data, int maxlen, int write,
1655                            struct file *filp, void __user *buffer,
1656                            size_t *lenp, loff_t *ppos)
1657 {
1658         size_t len;
1659         char __user *p;
1660         char c;
1661
1662         if (!data || !maxlen || !*lenp ||
1663             (*ppos && !write)) {
1664                 *lenp = 0;
1665                 return 0;
1666         }
1667
1668         if (write) {
1669                 len = 0;
1670                 p = buffer;
1671                 while (len < *lenp) {
1672                         if (get_user(c, p++))
1673                                 return -EFAULT;
1674                         if (c == 0 || c == '\n')
1675                                 break;
1676                         len++;
1677                 }
1678                 if (len >= maxlen)
1679                         len = maxlen-1;
1680                 if(copy_from_user(data, buffer, len))
1681                         return -EFAULT;
1682                 ((char *) data)[len] = 0;
1683                 *ppos += *lenp;
1684         } else {
1685                 len = strlen(data);
1686                 if (len > maxlen)
1687                         len = maxlen;
1688                 if (len > *lenp)
1689                         len = *lenp;
1690                 if (len)
1691                         if(copy_to_user(buffer, data, len))
1692                                 return -EFAULT;
1693                 if (len < *lenp) {
1694                         if(put_user('\n', ((char __user *) buffer) + len))
1695                                 return -EFAULT;
1696                         len++;
1697                 }
1698                 *lenp = len;
1699                 *ppos += len;
1700         }
1701         return 0;
1702 }
1703
1704 /**
1705  * proc_dostring - read a string sysctl
1706  * @table: the sysctl table
1707  * @write: %TRUE if this is a write to the sysctl file
1708  * @filp: the file structure
1709  * @buffer: the user buffer
1710  * @lenp: the size of the user buffer
1711  * @ppos: file position
1712  *
1713  * Reads/writes a string from/to the user buffer. If the kernel
1714  * buffer provided is not large enough to hold the string, the
1715  * string is truncated. The copied string is %NULL-terminated.
1716  * If the string is being read by the user process, it is copied
1717  * and a newline '\n' is added. It is truncated if the buffer is
1718  * not large enough.
1719  *
1720  * Returns 0 on success.
1721  */
1722 int proc_dostring(ctl_table *table, int write, struct file *filp,
1723                   void __user *buffer, size_t *lenp, loff_t *ppos)
1724 {
1725         return _proc_do_string(table->data, table->maxlen, write, filp,
1726                                buffer, lenp, ppos);
1727 }
1728
1729 /*
1730  *      Special case of dostring for the UTS structure. This has locks
1731  *      to observe. Should this be in kernel/sys.c ????
1732  */
1733
1734 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
1735                   void __user *buffer, size_t *lenp, loff_t *ppos)
1736 {
1737         int r;
1738         void *which;
1739         which = get_uts(table, write);
1740         r = _proc_do_string(which, table->maxlen,write,filp,buffer,lenp, ppos);
1741         put_uts(table, write, which);
1742         return r;
1743 }
1744
1745 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1746                                  int *valp,
1747                                  int write, void *data)
1748 {
1749         if (write) {
1750                 *valp = *negp ? -*lvalp : *lvalp;
1751         } else {
1752                 int val = *valp;
1753                 if (val < 0) {
1754                         *negp = -1;
1755                         *lvalp = (unsigned long)-val;
1756                 } else {
1757                         *negp = 0;
1758                         *lvalp = (unsigned long)val;
1759                 }
1760         }
1761         return 0;
1762 }
1763
1764 static int __do_proc_dointvec(void *tbl_data, ctl_table *table,
1765                   int write, struct file *filp, void __user *buffer,
1766                   size_t *lenp, loff_t *ppos,
1767                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1768                               int write, void *data),
1769                   void *data)
1770 {
1771 #define TMPBUFLEN 21
1772         int *i, vleft, first=1, neg, val;
1773         unsigned long lval;
1774         size_t left, len;
1775
1776         char buf[TMPBUFLEN], *p;
1777         char __user *s = buffer;
1778
1779         if (!tbl_data || !table->maxlen || !*lenp ||
1780             (*ppos && !write)) {
1781                 *lenp = 0;
1782                 return 0;
1783         }
1784
1785         i = (int *) tbl_data;
1786         vleft = table->maxlen / sizeof(*i);
1787         left = *lenp;
1788
1789         if (!conv)
1790                 conv = do_proc_dointvec_conv;
1791
1792         for (; left && vleft--; i++, first=0) {
1793                 if (write) {
1794                         while (left) {
1795                                 char c;
1796                                 if (get_user(c, s))
1797                                         return -EFAULT;
1798                                 if (!isspace(c))
1799                                         break;
1800                                 left--;
1801                                 s++;
1802                         }
1803                         if (!left)
1804                                 break;
1805                         neg = 0;
1806                         len = left;
1807                         if (len > sizeof(buf) - 1)
1808                                 len = sizeof(buf) - 1;
1809                         if (copy_from_user(buf, s, len))
1810                                 return -EFAULT;
1811                         buf[len] = 0;
1812                         p = buf;
1813                         if (*p == '-' && left > 1) {
1814                                 neg = 1;
1815                                 p++;
1816                         }
1817                         if (*p < '0' || *p > '9')
1818                                 break;
1819
1820                         lval = simple_strtoul(p, &p, 0);
1821
1822                         len = p-buf;
1823                         if ((len < left) && *p && !isspace(*p))
1824                                 break;
1825                         if (neg)
1826                                 val = -val;
1827                         s += len;
1828                         left -= len;
1829
1830                         if (conv(&neg, &lval, i, 1, data))
1831                                 break;
1832                 } else {
1833                         p = buf;
1834                         if (!first)
1835                                 *p++ = '\t';
1836
1837                         if (conv(&neg, &lval, i, 0, data))
1838                                 break;
1839
1840                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1841                         len = strlen(buf);
1842                         if (len > left)
1843                                 len = left;
1844                         if(copy_to_user(s, buf, len))
1845                                 return -EFAULT;
1846                         left -= len;
1847                         s += len;
1848                 }
1849         }
1850
1851         if (!write && !first && left) {
1852                 if(put_user('\n', s))
1853                         return -EFAULT;
1854                 left--, s++;
1855         }
1856         if (write) {
1857                 while (left) {
1858                         char c;
1859                         if (get_user(c, s++))
1860                                 return -EFAULT;
1861                         if (!isspace(c))
1862                                 break;
1863                         left--;
1864                 }
1865         }
1866         if (write && first)
1867                 return -EINVAL;
1868         *lenp -= left;
1869         *ppos += *lenp;
1870         return 0;
1871 #undef TMPBUFLEN
1872 }
1873
1874 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1875                   void __user *buffer, size_t *lenp, loff_t *ppos,
1876                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1877                               int write, void *data),
1878                   void *data)
1879 {
1880         return __do_proc_dointvec(table->data, table, write, filp,
1881                         buffer, lenp, ppos, conv, data);
1882 }
1883
1884 /**
1885  * proc_dointvec - read a vector of integers
1886  * @table: the sysctl table
1887  * @write: %TRUE if this is a write to the sysctl file
1888  * @filp: the file structure
1889  * @buffer: the user buffer
1890  * @lenp: the size of the user buffer
1891  * @ppos: file position
1892  *
1893  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1894  * values from/to the user buffer, treated as an ASCII string.
1895  *
1896  * Returns 0 on success.
1897  */
1898 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1899                      void __user *buffer, size_t *lenp, loff_t *ppos)
1900 {
1901     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1902                             NULL,NULL);
1903 }
1904
1905 #define OP_SET  0
1906 #define OP_AND  1
1907 #define OP_OR   2
1908 #define OP_MAX  3
1909 #define OP_MIN  4
1910
1911 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1912                                       int *valp,
1913                                       int write, void *data)
1914 {
1915         int op = *(int *)data;
1916         if (write) {
1917                 int val = *negp ? -*lvalp : *lvalp;
1918                 switch(op) {
1919                 case OP_SET:    *valp = val; break;
1920                 case OP_AND:    *valp &= val; break;
1921                 case OP_OR:     *valp |= val; break;
1922                 case OP_MAX:    if(*valp < val)
1923                                         *valp = val;
1924                                 break;
1925                 case OP_MIN:    if(*valp > val)
1926                                 *valp = val;
1927                                 break;
1928                 }
1929         } else {
1930                 int val = *valp;
1931                 if (val < 0) {
1932                         *negp = -1;
1933                         *lvalp = (unsigned long)-val;
1934                 } else {
1935                         *negp = 0;
1936                         *lvalp = (unsigned long)val;
1937                 }
1938         }
1939         return 0;
1940 }
1941
1942 /*
1943  *      init may raise the set.
1944  */
1945
1946 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1947                         void __user *buffer, size_t *lenp, loff_t *ppos)
1948 {
1949         int op;
1950
1951         if (!capable(CAP_SYS_MODULE)) {
1952                 return -EPERM;
1953         }
1954
1955         op = is_init(current) ? OP_SET : OP_AND;
1956         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1957                                 do_proc_dointvec_bset_conv,&op);
1958 }
1959
1960 struct do_proc_dointvec_minmax_conv_param {
1961         int *min;
1962         int *max;
1963 };
1964
1965 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1966                                         int *valp,
1967                                         int write, void *data)
1968 {
1969         struct do_proc_dointvec_minmax_conv_param *param = data;
1970         if (write) {
1971                 int val = *negp ? -*lvalp : *lvalp;
1972                 if ((param->min && *param->min > val) ||
1973                     (param->max && *param->max < val))
1974                         return -EINVAL;
1975                 *valp = val;
1976         } else {
1977                 int val = *valp;
1978                 if (val < 0) {
1979                         *negp = -1;
1980                         *lvalp = (unsigned long)-val;
1981                 } else {
1982                         *negp = 0;
1983                         *lvalp = (unsigned long)val;
1984                 }
1985         }
1986         return 0;
1987 }
1988
1989 /**
1990  * proc_dointvec_minmax - read a vector of integers with min/max values
1991  * @table: the sysctl table
1992  * @write: %TRUE if this is a write to the sysctl file
1993  * @filp: the file structure
1994  * @buffer: the user buffer
1995  * @lenp: the size of the user buffer
1996  * @ppos: file position
1997  *
1998  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1999  * values from/to the user buffer, treated as an ASCII string.
2000  *
2001  * This routine will ensure the values are within the range specified by
2002  * table->extra1 (min) and table->extra2 (max).
2003  *
2004  * Returns 0 on success.
2005  */
2006 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2007                   void __user *buffer, size_t *lenp, loff_t *ppos)
2008 {
2009         struct do_proc_dointvec_minmax_conv_param param = {
2010                 .min = (int *) table->extra1,
2011                 .max = (int *) table->extra2,
2012         };
2013         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2014                                 do_proc_dointvec_minmax_conv, &param);
2015 }
2016
2017 static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write,
2018                                      struct file *filp,
2019                                      void __user *buffer,
2020                                      size_t *lenp, loff_t *ppos,
2021                                      unsigned long convmul,
2022                                      unsigned long convdiv)
2023 {
2024 #define TMPBUFLEN 21
2025         unsigned long *i, *min, *max, val;
2026         int vleft, first=1, neg;
2027         size_t len, left;
2028         char buf[TMPBUFLEN], *p;
2029         char __user *s = buffer;
2030
2031         if (!data || !table->maxlen || !*lenp ||
2032             (*ppos && !write)) {
2033                 *lenp = 0;
2034                 return 0;
2035         }
2036
2037         i = (unsigned long *) data;
2038         min = (unsigned long *) table->extra1;
2039         max = (unsigned long *) table->extra2;
2040         vleft = table->maxlen / sizeof(unsigned long);
2041         left = *lenp;
2042
2043         for (; left && vleft--; i++, min++, max++, first=0) {
2044                 if (write) {
2045                         while (left) {
2046                                 char c;
2047                                 if (get_user(c, s))
2048                                         return -EFAULT;
2049                                 if (!isspace(c))
2050                                         break;
2051                                 left--;
2052                                 s++;
2053                         }
2054                         if (!left)
2055                                 break;
2056                         neg = 0;
2057                         len = left;
2058                         if (len > TMPBUFLEN-1)
2059                                 len = TMPBUFLEN-1;
2060                         if (copy_from_user(buf, s, len))
2061                                 return -EFAULT;
2062                         buf[len] = 0;
2063                         p = buf;
2064                         if (*p == '-' && left > 1) {
2065                                 neg = 1;
2066                                 p++;
2067                         }
2068                         if (*p < '0' || *p > '9')
2069                                 break;
2070                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2071                         len = p-buf;
2072                         if ((len < left) && *p && !isspace(*p))
2073                                 break;
2074                         if (neg)
2075                                 val = -val;
2076                         s += len;
2077                         left -= len;
2078
2079                         if(neg)
2080                                 continue;
2081                         if ((min && val < *min) || (max && val > *max))
2082                                 continue;
2083                         *i = val;
2084                 } else {
2085                         p = buf;
2086                         if (!first)
2087                                 *p++ = '\t';
2088                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2089                         len = strlen(buf);
2090                         if (len > left)
2091                                 len = left;
2092                         if(copy_to_user(s, buf, len))
2093                                 return -EFAULT;
2094                         left -= len;
2095                         s += len;
2096                 }
2097         }
2098
2099         if (!write && !first && left) {
2100                 if(put_user('\n', s))
2101                         return -EFAULT;
2102                 left--, s++;
2103         }
2104         if (write) {
2105                 while (left) {
2106                         char c;
2107                         if (get_user(c, s++))
2108                                 return -EFAULT;
2109                         if (!isspace(c))
2110                                 break;
2111                         left--;
2112                 }
2113         }
2114         if (write && first)
2115                 return -EINVAL;
2116         *lenp -= left;
2117         *ppos += *lenp;
2118         return 0;
2119 #undef TMPBUFLEN
2120 }
2121
2122 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
2123                                      struct file *filp,
2124                                      void __user *buffer,
2125                                      size_t *lenp, loff_t *ppos,
2126                                      unsigned long convmul,
2127                                      unsigned long convdiv)
2128 {
2129         return __do_proc_doulongvec_minmax(table->data, table, write,
2130                         filp, buffer, lenp, ppos, convmul, convdiv);
2131 }
2132
2133 /**
2134  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2135  * @table: the sysctl table
2136  * @write: %TRUE if this is a write to the sysctl file
2137  * @filp: the file structure
2138  * @buffer: the user buffer
2139  * @lenp: the size of the user buffer
2140  * @ppos: file position
2141  *
2142  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2143  * values from/to the user buffer, treated as an ASCII string.
2144  *
2145  * This routine will ensure the values are within the range specified by
2146  * table->extra1 (min) and table->extra2 (max).
2147  *
2148  * Returns 0 on success.
2149  */
2150 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2151                            void __user *buffer, size_t *lenp, loff_t *ppos)
2152 {
2153     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2154 }
2155
2156 /**
2157  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2158  * @table: the sysctl table
2159  * @write: %TRUE if this is a write to the sysctl file
2160  * @filp: the file structure
2161  * @buffer: the user buffer
2162  * @lenp: the size of the user buffer
2163  * @ppos: file position
2164  *
2165  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2166  * values from/to the user buffer, treated as an ASCII string. The values
2167  * are treated as milliseconds, and converted to jiffies when they are stored.
2168  *
2169  * This routine will ensure the values are within the range specified by
2170  * table->extra1 (min) and table->extra2 (max).
2171  *
2172  * Returns 0 on success.
2173  */
2174 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2175                                       struct file *filp,
2176                                       void __user *buffer,
2177                                       size_t *lenp, loff_t *ppos)
2178 {
2179     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2180                                      lenp, ppos, HZ, 1000l);
2181 }
2182
2183
2184 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2185                                          int *valp,
2186                                          int write, void *data)
2187 {
2188         if (write) {
2189                 if (*lvalp > LONG_MAX / HZ)
2190                         return 1;
2191                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2192         } else {
2193                 int val = *valp;
2194                 unsigned long lval;
2195                 if (val < 0) {
2196                         *negp = -1;
2197                         lval = (unsigned long)-val;
2198                 } else {
2199                         *negp = 0;
2200                         lval = (unsigned long)val;
2201                 }
2202                 *lvalp = lval / HZ;
2203         }
2204         return 0;
2205 }
2206
2207 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2208                                                 int *valp,
2209                                                 int write, void *data)
2210 {
2211         if (write) {
2212                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2213                         return 1;
2214                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2215         } else {
2216                 int val = *valp;
2217                 unsigned long lval;
2218                 if (val < 0) {
2219                         *negp = -1;
2220                         lval = (unsigned long)-val;
2221                 } else {
2222                         *negp = 0;
2223                         lval = (unsigned long)val;
2224                 }
2225                 *lvalp = jiffies_to_clock_t(lval);
2226         }
2227         return 0;
2228 }
2229
2230 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2231                                             int *valp,
2232                                             int write, void *data)
2233 {
2234         if (write) {
2235                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2236         } else {
2237                 int val = *valp;
2238                 unsigned long lval;
2239                 if (val < 0) {
2240                         *negp = -1;
2241                         lval = (unsigned long)-val;
2242                 } else {
2243                         *negp = 0;
2244                         lval = (unsigned long)val;
2245                 }
2246                 *lvalp = jiffies_to_msecs(lval);
2247         }
2248         return 0;
2249 }
2250
2251 /**
2252  * proc_dointvec_jiffies - read a vector of integers as seconds
2253  * @table: the sysctl table
2254  * @write: %TRUE if this is a write to the sysctl file
2255  * @filp: the file structure
2256  * @buffer: the user buffer
2257  * @lenp: the size of the user buffer
2258  * @ppos: file position
2259  *
2260  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2261  * values from/to the user buffer, treated as an ASCII string.
2262  * The values read are assumed to be in seconds, and are converted into
2263  * jiffies.
2264  *
2265  * Returns 0 on success.
2266  */
2267 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2268                           void __user *buffer, size_t *lenp, loff_t *ppos)
2269 {
2270     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2271                             do_proc_dointvec_jiffies_conv,NULL);
2272 }
2273
2274 /**
2275  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2276  * @table: the sysctl table
2277  * @write: %TRUE if this is a write to the sysctl file
2278  * @filp: the file structure
2279  * @buffer: the user buffer
2280  * @lenp: the size of the user buffer
2281  * @ppos: pointer to the file position
2282  *
2283  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2284  * values from/to the user buffer, treated as an ASCII string.
2285  * The values read are assumed to be in 1/USER_HZ seconds, and
2286  * are converted into jiffies.
2287  *
2288  * Returns 0 on success.
2289  */
2290 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2291                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2292 {
2293     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2294                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2295 }
2296
2297 /**
2298  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2299  * @table: the sysctl table
2300  * @write: %TRUE if this is a write to the sysctl file
2301  * @filp: the file structure
2302  * @buffer: the user buffer
2303  * @lenp: the size of the user buffer
2304  * @ppos: file position
2305  * @ppos: the current position in the file
2306  *
2307  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2308  * values from/to the user buffer, treated as an ASCII string.
2309  * The values read are assumed to be in 1/1000 seconds, and
2310  * are converted into jiffies.
2311  *
2312  * Returns 0 on success.
2313  */
2314 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2315                              void __user *buffer, size_t *lenp, loff_t *ppos)
2316 {
2317         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2318                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2319 }
2320
2321 #ifdef CONFIG_SYSVIPC
2322 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2323                 void __user *buffer, size_t *lenp, loff_t *ppos)
2324 {
2325         void *data;
2326         struct ipc_namespace *ns;
2327
2328         ns = current->nsproxy->ipc_ns;
2329
2330         switch (table->ctl_name) {
2331         case KERN_SHMMAX:
2332                 data = &ns->shm_ctlmax;
2333                 goto proc_minmax;
2334         case KERN_SHMALL:
2335                 data = &ns->shm_ctlall;
2336                 goto proc_minmax;
2337         case KERN_SHMMNI:
2338                 data = &ns->shm_ctlmni;
2339                 break;
2340         case KERN_MSGMAX:
2341                 data = &ns->msg_ctlmax;
2342                 break;
2343         case KERN_MSGMNI:
2344                 data = &ns->msg_ctlmni;
2345                 break;
2346         case KERN_MSGMNB:
2347                 data = &ns->msg_ctlmnb;
2348                 break;
2349         case KERN_SEM:
2350                 data = &ns->sem_ctls;
2351                 break;
2352         default:
2353                 return -EINVAL;
2354         }
2355
2356         return __do_proc_dointvec(data, table, write, filp, buffer,
2357                         lenp, ppos, NULL, NULL);
2358 proc_minmax:
2359         return __do_proc_doulongvec_minmax(data, table, write, filp, buffer,
2360                         lenp, ppos, 1l, 1l);
2361 }
2362 #endif
2363
2364 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
2365                            void __user *buffer, size_t *lenp, loff_t *ppos)
2366 {
2367         struct pid *new_pid;
2368         pid_t tmp;
2369         int r;
2370
2371         tmp = pid_nr(cad_pid);
2372
2373         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2374                                lenp, ppos, NULL, NULL);
2375         if (r || !write)
2376                 return r;
2377
2378         new_pid = find_get_pid(tmp);
2379         if (!new_pid)
2380                 return -ESRCH;
2381
2382         put_pid(xchg(&cad_pid, new_pid));
2383         return 0;
2384 }
2385
2386 #else /* CONFIG_PROC_FS */
2387
2388 int proc_dostring(ctl_table *table, int write, struct file *filp,
2389                   void __user *buffer, size_t *lenp, loff_t *ppos)
2390 {
2391         return -ENOSYS;
2392 }
2393
2394 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
2395                 void __user *buffer, size_t *lenp, loff_t *ppos)
2396 {
2397         return -ENOSYS;
2398 }
2399
2400 #ifdef CONFIG_SYSVIPC
2401 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2402                 void __user *buffer, size_t *lenp, loff_t *ppos)
2403 {
2404         return -ENOSYS;
2405 }
2406 #endif
2407
2408 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2409                   void __user *buffer, size_t *lenp, loff_t *ppos)
2410 {
2411         return -ENOSYS;
2412 }
2413
2414 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2415                         void __user *buffer, size_t *lenp, loff_t *ppos)
2416 {
2417         return -ENOSYS;
2418 }
2419
2420 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2421                     void __user *buffer, size_t *lenp, loff_t *ppos)
2422 {
2423         return -ENOSYS;
2424 }
2425
2426 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2427                     void __user *buffer, size_t *lenp, loff_t *ppos)
2428 {
2429         return -ENOSYS;
2430 }
2431
2432 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2433                     void __user *buffer, size_t *lenp, loff_t *ppos)
2434 {
2435         return -ENOSYS;
2436 }
2437
2438 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2439                              void __user *buffer, size_t *lenp, loff_t *ppos)
2440 {
2441         return -ENOSYS;
2442 }
2443
2444 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2445                     void __user *buffer, size_t *lenp, loff_t *ppos)
2446 {
2447         return -ENOSYS;
2448 }
2449
2450 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2451                                       struct file *filp,
2452                                       void __user *buffer,
2453                                       size_t *lenp, loff_t *ppos)
2454 {
2455     return -ENOSYS;
2456 }
2457
2458
2459 #endif /* CONFIG_PROC_FS */
2460
2461
2462 #ifdef CONFIG_SYSCTL_SYSCALL
2463 /*
2464  * General sysctl support routines
2465  */
2466
2467 /* The generic string strategy routine: */
2468 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2469                   void __user *oldval, size_t __user *oldlenp,
2470                   void __user *newval, size_t newlen, void **context)
2471 {
2472         if (!table->data || !table->maxlen)
2473                 return -ENOTDIR;
2474
2475         if (oldval && oldlenp) {
2476                 size_t bufsize;
2477                 if (get_user(bufsize, oldlenp))
2478                         return -EFAULT;
2479                 if (bufsize) {
2480                         size_t len = strlen(table->data), copied;
2481
2482                         /* This shouldn't trigger for a well-formed sysctl */
2483                         if (len > table->maxlen)
2484                                 len = table->maxlen;
2485
2486                         /* Copy up to a max of bufsize-1 bytes of the string */
2487                         copied = (len >= bufsize) ? bufsize - 1 : len;
2488
2489                         if (copy_to_user(oldval, table->data, copied) ||
2490                             put_user(0, (char __user *)(oldval + copied)))
2491                                 return -EFAULT;
2492                         if (put_user(len, oldlenp))
2493                                 return -EFAULT;
2494                 }
2495         }
2496         if (newval && newlen) {
2497                 size_t len = newlen;
2498                 if (len > table->maxlen)
2499                         len = table->maxlen;
2500                 if(copy_from_user(table->data, newval, len))
2501                         return -EFAULT;
2502                 if (len == table->maxlen)
2503                         len--;
2504                 ((char *) table->data)[len] = 0;
2505         }
2506         return 1;
2507 }
2508
2509 /*
2510  * This function makes sure that all of the integers in the vector
2511  * are between the minimum and maximum values given in the arrays
2512  * table->extra1 and table->extra2, respectively.
2513  */
2514 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2515                 void __user *oldval, size_t __user *oldlenp,
2516                 void __user *newval, size_t newlen, void **context)
2517 {
2518
2519         if (newval && newlen) {
2520                 int __user *vec = (int __user *) newval;
2521                 int *min = (int *) table->extra1;
2522                 int *max = (int *) table->extra2;
2523                 size_t length;
2524                 int i;
2525
2526                 if (newlen % sizeof(int) != 0)
2527                         return -EINVAL;
2528
2529                 if (!table->extra1 && !table->extra2)
2530                         return 0;
2531
2532                 if (newlen > table->maxlen)
2533                         newlen = table->maxlen;
2534                 length = newlen / sizeof(int);
2535
2536                 for (i = 0; i < length; i++) {
2537                         int value;
2538                         if (get_user(value, vec + i))
2539                                 return -EFAULT;
2540                         if (min && value < min[i])
2541                                 return -EINVAL;
2542                         if (max && value > max[i])
2543                                 return -EINVAL;
2544                 }
2545         }
2546         return 0;
2547 }
2548
2549 /* Strategy function to convert jiffies to seconds */
2550 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2551                 void __user *oldval, size_t __user *oldlenp,
2552                 void __user *newval, size_t newlen, void **context)
2553 {
2554         if (oldval) {
2555                 size_t olen;
2556                 if (oldlenp) {
2557                         if (get_user(olen, oldlenp))
2558                                 return -EFAULT;
2559                         if (olen!=sizeof(int))
2560                                 return -EINVAL;
2561                 }
2562                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2563                     (oldlenp && put_user(sizeof(int),oldlenp)))
2564                         return -EFAULT;
2565         }
2566         if (newval && newlen) {
2567                 int new;
2568                 if (newlen != sizeof(int))
2569                         return -EINVAL;
2570                 if (get_user(new, (int __user *)newval))
2571                         return -EFAULT;
2572                 *(int *)(table->data) = new*HZ;
2573         }
2574         return 1;
2575 }
2576
2577 /* Strategy function to convert jiffies to seconds */
2578 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2579                 void __user *oldval, size_t __user *oldlenp,
2580                 void __user *newval, size_t newlen, void **context)
2581 {
2582         if (oldval) {
2583                 size_t olen;
2584                 if (oldlenp) {
2585                         if (get_user(olen, oldlenp))
2586                                 return -EFAULT;
2587                         if (olen!=sizeof(int))
2588                                 return -EINVAL;
2589                 }
2590                 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2591                     (oldlenp && put_user(sizeof(int),oldlenp)))
2592                         return -EFAULT;
2593         }
2594         if (newval && newlen) {
2595                 int new;
2596                 if (newlen != sizeof(int))
2597                         return -EINVAL;
2598                 if (get_user(new, (int __user *)newval))
2599                         return -EFAULT;
2600                 *(int *)(table->data) = msecs_to_jiffies(new);
2601         }
2602         return 1;
2603 }
2604
2605
2606 /* The generic string strategy routine: */
2607 static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
2608                   void __user *oldval, size_t __user *oldlenp,
2609                   void __user *newval, size_t newlen, void **context)
2610 {
2611         struct ctl_table uts_table;
2612         int r, write;
2613         write = newval && newlen;
2614         memcpy(&uts_table, table, sizeof(uts_table));
2615         uts_table.data = get_uts(table, write);
2616         r = sysctl_string(&uts_table, name, nlen,
2617                 oldval, oldlenp, newval, newlen, context);
2618         put_uts(table, write, uts_table.data);
2619         return r;
2620 }
2621
2622 #else /* CONFIG_SYSCTL_SYSCALL */
2623
2624
2625 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2626 {
2627         static int msg_count;
2628         struct __sysctl_args tmp;
2629         int name[CTL_MAXNAME];
2630         int i;
2631
2632         /* Read in the sysctl name for better debug message logging */
2633         if (copy_from_user(&tmp, args, sizeof(tmp)))
2634                 return -EFAULT;
2635         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2636                 return -ENOTDIR;
2637         for (i = 0; i < tmp.nlen; i++)
2638                 if (get_user(name[i], tmp.name + i))
2639                         return -EFAULT;
2640
2641         /* Ignore accesses to kernel.version */
2642         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2643                 goto out;
2644
2645         if (msg_count < 5) {
2646                 msg_count++;
2647                 printk(KERN_INFO
2648                         "warning: process `%s' used the removed sysctl "
2649                         "system call with ", current->comm);
2650                 for (i = 0; i < tmp.nlen; i++)
2651                         printk("%d.", name[i]);
2652                 printk("\n");
2653         }
2654 out:
2655         return -ENOSYS;
2656 }
2657
2658 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2659                   void __user *oldval, size_t __user *oldlenp,
2660                   void __user *newval, size_t newlen, void **context)
2661 {
2662         return -ENOSYS;
2663 }
2664
2665 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2666                 void __user *oldval, size_t __user *oldlenp,
2667                 void __user *newval, size_t newlen, void **context)
2668 {
2669         return -ENOSYS;
2670 }
2671
2672 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2673                 void __user *oldval, size_t __user *oldlenp,
2674                 void __user *newval, size_t newlen, void **context)
2675 {
2676         return -ENOSYS;
2677 }
2678
2679 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2680                 void __user *oldval, size_t __user *oldlenp,
2681                 void __user *newval, size_t newlen, void **context)
2682 {
2683         return -ENOSYS;
2684 }
2685
2686 static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
2687                   void __user *oldval, size_t __user *oldlenp,
2688                   void __user *newval, size_t newlen, void **context)
2689 {
2690         return -ENOSYS;
2691 }
2692 #endif /* CONFIG_SYSCTL_SYSCALL */
2693
2694 /*
2695  * No sense putting this after each symbol definition, twice,
2696  * exception granted :-)
2697  */
2698 EXPORT_SYMBOL(proc_dointvec);
2699 EXPORT_SYMBOL(proc_dointvec_jiffies);
2700 EXPORT_SYMBOL(proc_dointvec_minmax);
2701 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2702 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2703 EXPORT_SYMBOL(proc_dostring);
2704 EXPORT_SYMBOL(proc_doulongvec_minmax);
2705 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2706 EXPORT_SYMBOL(register_sysctl_table);
2707 EXPORT_SYMBOL(sysctl_intvec);
2708 EXPORT_SYMBOL(sysctl_jiffies);
2709 EXPORT_SYMBOL(sysctl_ms_jiffies);
2710 EXPORT_SYMBOL(sysctl_string);
2711 EXPORT_SYMBOL(unregister_sysctl_table);