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 #ifdef CONFIG_PROC_SYSCTL
 141 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
 142                   void __user *buffer, size_t *lenp, loff_t *ppos);
 143 #endif
 144
 145 static ctl_table root_table[];
 146 static struct ctl_table_header root_table_header =
 147         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 148
 149 static ctl_table kern_table[];
 150 static ctl_table vm_table[];
 151 static ctl_table fs_table[];
 152 static ctl_table debug_table[];
 153 static ctl_table dev_table[];
 154 extern ctl_table random_table[];
 155 #ifdef CONFIG_UNIX98_PTYS
 156 extern ctl_table pty_table[];
 157 #endif
 158 #ifdef CONFIG_INOTIFY_USER
 159 extern ctl_table inotify_table[];
 160 #endif
 161
 162 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 163 int sysctl_legacy_va_layout;
 164 #endif
 165
 166 /* /proc declarations: */
 167
 168 #ifdef CONFIG_PROC_SYSCTL
 169
 170 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
 171 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
 172 static int proc_opensys(struct inode *, struct file *);
 173
 174 const struct file_operations proc_sys_file_operations = {
 175         .open           = proc_opensys,
 176         .read           = proc_readsys,
 177         .write          = proc_writesys,
 178 };
 179
 180 extern struct proc_dir_entry *proc_sys_root;
 181
 182 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
 183 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
 184 #endif
 185
 186 /* The default sysctl tables: */
 187
 188 static ctl_table root_table[] = {
 189         {
 190                 .ctl_name       = CTL_KERN,
 191                 .procname       = "kernel",
 192                 .mode           = 0555,
 193                 .child          = kern_table,
 194         },
 195         {
 196                 .ctl_name       = CTL_VM,
 197                 .procname       = "vm",
 198                 .mode           = 0555,
 199                 .child          = vm_table,
 200         },
 201 #ifdef CONFIG_NET
 202         {
 203                 .ctl_name       = CTL_NET,
 204                 .procname       = "net",
 205                 .mode           = 0555,
 206                 .child          = net_table,
 207         },
 208 #endif
 209         {
 210                 .ctl_name       = CTL_FS,
 211                 .procname       = "fs",
 212                 .mode           = 0555,
 213                 .child          = fs_table,
 214         },
 215         {
 216                 .ctl_name       = CTL_DEBUG,
 217                 .procname       = "debug",
 218                 .mode           = 0555,
 219                 .child          = debug_table,
 220         },
 221         {
 222                 .ctl_name       = CTL_DEV,
 223                 .procname       = "dev",
 224                 .mode           = 0555,
 225                 .child          = dev_table,
 226         },
 227
 228         { .ctl_name = 0 }
 229 };
 230
 231 static ctl_table kern_table[] = {
 232 #ifndef CONFIG_UTS_NS
 233         {
 234                 .ctl_name       = KERN_OSTYPE,
 235                 .procname       = "ostype",
 236                 .data           = init_uts_ns.name.sysname,
 237                 .maxlen         = sizeof(init_uts_ns.name.sysname),
 238                 .mode           = 0444,
 239                 .proc_handler   = &proc_do_uts_string,
 240                 .strategy       = &sysctl_string,
 241         },
 242         {
 243                 .ctl_name       = KERN_OSRELEASE,
 244                 .procname       = "osrelease",
 245                 .data           = init_uts_ns.name.release,
 246                 .maxlen         = sizeof(init_uts_ns.name.release),
 247                 .mode           = 0444,
 248                 .proc_handler   = &proc_do_uts_string,
 249                 .strategy       = &sysctl_string,
 250         },
 251         {
 252                 .ctl_name       = KERN_VERSION,
 253                 .procname       = "version",
 254                 .data           = init_uts_ns.name.version,
 255                 .maxlen         = sizeof(init_uts_ns.name.version),
 256                 .mode           = 0444,
 257                 .proc_handler   = &proc_do_uts_string,
 258                 .strategy       = &sysctl_string,
 259         },
 260         {
 261                 .ctl_name       = KERN_NODENAME,
 262                 .procname       = "hostname",
 263                 .data           = init_uts_ns.name.nodename,
 264                 .maxlen         = sizeof(init_uts_ns.name.nodename),
 265                 .mode           = 0644,
 266                 .proc_handler   = &proc_do_uts_string,
 267                 .strategy       = &sysctl_string,
 268         },
 269         {
 270                 .ctl_name       = KERN_DOMAINNAME,
 271                 .procname       = "domainname",
 272                 .data           = init_uts_ns.name.domainname,
 273                 .maxlen         = sizeof(init_uts_ns.name.domainname),
 274                 .mode           = 0644,
 275                 .proc_handler   = &proc_do_uts_string,
 276                 .strategy       = &sysctl_string,
 277         },
 278 #else  /* !CONFIG_UTS_NS */
 279         {
 280                 .ctl_name       = KERN_OSTYPE,
 281                 .procname       = "ostype",
 282                 .data           = NULL,
 283                 /* could maybe use __NEW_UTS_LEN here? */
 284                 .maxlen         = FIELD_SIZEOF(struct new_utsname, sysname),
 285                 .mode           = 0444,
 286                 .proc_handler   = &proc_do_uts_string,
 287                 .strategy       = &sysctl_string,
 288         },
 289         {
 290                 .ctl_name       = KERN_OSRELEASE,
 291                 .procname       = "osrelease",
 292                 .data           = NULL,
 293                 .maxlen         = FIELD_SIZEOF(struct new_utsname, release),
 294                 .mode           = 0444,
 295                 .proc_handler   = &proc_do_uts_string,
 296                 .strategy       = &sysctl_string,
 297         },
 298         {
 299                 .ctl_name       = KERN_VERSION,
 300                 .procname       = "version",
 301                 .data           = NULL,
 302                 .maxlen         = FIELD_SIZEOF(struct new_utsname, version),
 303                 .mode           = 0444,
 304                 .proc_handler   = &proc_do_uts_string,
 305                 .strategy       = &sysctl_string,
 306         },
 307         {
 308                 .ctl_name       = KERN_NODENAME,
 309                 .procname       = "hostname",
 310                 .data           = NULL,
 311                 .maxlen         = FIELD_SIZEOF(struct new_utsname, nodename),
 312                 .mode           = 0644,
 313                 .proc_handler   = &proc_do_uts_string,
 314                 .strategy       = &sysctl_string,
 315         },
 316         {
 317                 .ctl_name       = KERN_DOMAINNAME,
 318                 .procname       = "domainname",
 319                 .data           = NULL,
 320                 .maxlen         = FIELD_SIZEOF(struct new_utsname, domainname),
 321                 .mode           = 0644,
 322                 .proc_handler   = &proc_do_uts_string,
 323                 .strategy       = &sysctl_string,
 324         },
 325 #endif /* !CONFIG_UTS_NS */
 326         {
 327                 .ctl_name       = KERN_PANIC,
 328                 .procname       = "panic",
 329                 .data           = &panic_timeout,
 330                 .maxlen         = sizeof(int),
 331                 .mode           = 0644,
 332                 .proc_handler   = &proc_dointvec,
 333         },
 334         {
 335                 .ctl_name       = KERN_CORE_USES_PID,
 336                 .procname       = "core_uses_pid",
 337                 .data           = &core_uses_pid,
 338                 .maxlen         = sizeof(int),
 339                 .mode           = 0644,
 340                 .proc_handler   = &proc_dointvec,
 341         },
 342         {
 343                 .ctl_name       = KERN_CORE_PATTERN,
 344                 .procname       = "core_pattern",
 345                 .data           = core_pattern,
 346                 .maxlen         = 128,
 347                 .mode           = 0644,
 348                 .proc_handler   = &proc_dostring,
 349                 .strategy       = &sysctl_string,
 350         },
 351         {
 352                 .ctl_name       = KERN_TAINTED,
 353                 .procname       = "tainted",
 354                 .data           = &tainted,
 355                 .maxlen         = sizeof(int),
 356                 .mode           = 0444,
 357                 .proc_handler   = &proc_dointvec,
 358         },
 359         {
 360                 .ctl_name       = KERN_CAP_BSET,
 361                 .procname       = "cap-bound",
 362                 .data           = &cap_bset,
 363                 .maxlen         = sizeof(kernel_cap_t),
 364                 .mode           = 0600,
 365                 .proc_handler   = &proc_dointvec_bset,
 366         },
 367 #ifdef CONFIG_BLK_DEV_INITRD
 368         {
 369                 .ctl_name       = KERN_REALROOTDEV,
 370                 .procname       = "real-root-dev",
 371                 .data           = &real_root_dev,
 372                 .maxlen         = sizeof(int),
 373                 .mode           = 0644,
 374                 .proc_handler   = &proc_dointvec,
 375         },
 376 #endif
 377 #ifdef __sparc__
 378         {
 379                 .ctl_name       = KERN_SPARC_REBOOT,
 380                 .procname       = "reboot-cmd",
 381                 .data           = reboot_command,
 382                 .maxlen         = 256,
 383                 .mode           = 0644,
 384                 .proc_handler   = &proc_dostring,
 385                 .strategy       = &sysctl_string,
 386         },
 387         {
 388                 .ctl_name       = KERN_SPARC_STOP_A,
 389                 .procname       = "stop-a",
 390                 .data           = &stop_a_enabled,
 391                 .maxlen         = sizeof (int),
 392                 .mode           = 0644,
 393                 .proc_handler   = &proc_dointvec,
 394         },
 395         {
 396                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 397                 .procname       = "scons-poweroff",
 398                 .data           = &scons_pwroff,
 399                 .maxlen         = sizeof (int),
 400                 .mode           = 0644,
 401                 .proc_handler   = &proc_dointvec,
 402         },
 403 #endif
 404 #ifdef __hppa__
 405         {
 406                 .ctl_name       = KERN_HPPA_PWRSW,
 407                 .procname       = "soft-power",
 408                 .data           = &pwrsw_enabled,
 409                 .maxlen         = sizeof (int),
 410                 .mode           = 0644,
 411                 .proc_handler   = &proc_dointvec,
 412         },
 413         {
 414                 .ctl_name       = KERN_HPPA_UNALIGNED,
 415                 .procname       = "unaligned-trap",
 416                 .data           = &unaligned_enabled,
 417                 .maxlen         = sizeof (int),
 418                 .mode           = 0644,
 419                 .proc_handler   = &proc_dointvec,
 420         },
 421 #endif
 422         {
 423                 .ctl_name       = KERN_CTLALTDEL,
 424                 .procname       = "ctrl-alt-del",
 425                 .data           = &C_A_D,
 426                 .maxlen         = sizeof(int),
 427                 .mode           = 0644,
 428                 .proc_handler   = &proc_dointvec,
 429         },
 430         {
 431                 .ctl_name       = KERN_PRINTK,
 432                 .procname       = "printk",
 433                 .data           = &console_loglevel,
 434                 .maxlen         = 4*sizeof(int),
 435                 .mode           = 0644,
 436                 .proc_handler   = &proc_dointvec,
 437         },
 438 #ifdef CONFIG_KMOD
 439         {
 440                 .ctl_name       = KERN_MODPROBE,
 441                 .procname       = "modprobe",
 442                 .data           = &modprobe_path,
 443                 .maxlen         = KMOD_PATH_LEN,
 444                 .mode           = 0644,
 445                 .proc_handler   = &proc_dostring,
 446                 .strategy       = &sysctl_string,
 447         },
 448 #endif
 449 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 450         {
 451                 .ctl_name       = KERN_HOTPLUG,
 452                 .procname       = "hotplug",
 453                 .data           = &uevent_helper,
 454                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 455                 .mode           = 0644,
 456                 .proc_handler   = &proc_dostring,
 457                 .strategy       = &sysctl_string,
 458         },
 459 #endif
 460 #ifdef CONFIG_CHR_DEV_SG
 461         {
 462                 .ctl_name       = KERN_SG_BIG_BUFF,
 463                 .procname       = "sg-big-buff",
 464                 .data           = &sg_big_buff,
 465                 .maxlen         = sizeof (int),
 466                 .mode           = 0444,
 467                 .proc_handler   = &proc_dointvec,
 468         },
 469 #endif
 470 #ifdef CONFIG_BSD_PROCESS_ACCT
 471         {
 472                 .ctl_name       = KERN_ACCT,
 473                 .procname       = "acct",
 474                 .data           = &acct_parm,
 475                 .maxlen         = 3*sizeof(int),
 476                 .mode           = 0644,
 477                 .proc_handler   = &proc_dointvec,
 478         },
 479 #endif
 480 #ifdef CONFIG_SYSVIPC
 481         {
 482                 .ctl_name       = KERN_SHMMAX,
 483                 .procname       = "shmmax",
 484                 .data           = NULL,
 485                 .maxlen         = sizeof (size_t),
 486                 .mode           = 0644,
 487                 .proc_handler   = &proc_do_ipc_string,
 488         },
 489         {
 490                 .ctl_name       = KERN_SHMALL,
 491                 .procname       = "shmall",
 492                 .data           = NULL,
 493                 .maxlen         = sizeof (size_t),
 494                 .mode           = 0644,
 495                 .proc_handler   = &proc_do_ipc_string,
 496         },
 497         {
 498                 .ctl_name       = KERN_SHMMNI,
 499                 .procname       = "shmmni",
 500                 .data           = NULL,
 501                 .maxlen         = sizeof (int),
 502                 .mode           = 0644,
 503                 .proc_handler   = &proc_do_ipc_string,
 504         },
 505         {
 506                 .ctl_name       = KERN_MSGMAX,
 507                 .procname       = "msgmax",
 508                 .data           = NULL,
 509                 .maxlen         = sizeof (int),
 510                 .mode           = 0644,
 511                 .proc_handler   = &proc_do_ipc_string,
 512         },
 513         {
 514                 .ctl_name       = KERN_MSGMNI,
 515                 .procname       = "msgmni",
 516                 .data           = NULL,
 517                 .maxlen         = sizeof (int),
 518                 .mode           = 0644,
 519                 .proc_handler   = &proc_do_ipc_string,
 520         },
 521         {
 522                 .ctl_name       = KERN_MSGMNB,
 523                 .procname       =  "msgmnb",
 524                 .data           = NULL,
 525                 .maxlen         = sizeof (int),
 526                 .mode           = 0644,
 527                 .proc_handler   = &proc_do_ipc_string,
 528         },
 529         {
 530                 .ctl_name       = KERN_SEM,
 531                 .procname       = "sem",
 532                 .data           = NULL,
 533                 .maxlen         = 4*sizeof (int),
 534                 .mode           = 0644,
 535                 .proc_handler   = &proc_do_ipc_string,
 536         },
 537 #endif
 538 #ifdef CONFIG_MAGIC_SYSRQ
 539         {
 540                 .ctl_name       = KERN_SYSRQ,
 541                 .procname       = "sysrq",
 542                 .data           = &sysrq_enabled,
 543                 .maxlen         = sizeof (int),
 544                 .mode           = 0644,
 545                 .proc_handler   = &proc_dointvec,
 546         },
 547 #endif
 548 #ifdef CONFIG_PROC_SYSCTL
 549         {
 550                 .ctl_name       = KERN_CADPID,
 551                 .procname       = "cad_pid",
 552                 .data           = NULL,
 553                 .maxlen         = sizeof (int),
 554                 .mode           = 0600,
 555                 .proc_handler   = &proc_do_cad_pid,
 556         },
 557 #endif
 558         {
 559                 .ctl_name       = KERN_MAX_THREADS,
 560                 .procname       = "threads-max",
 561                 .data           = &max_threads,
 562                 .maxlen         = sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = &proc_dointvec,
 565         },
 566         {
 567                 .ctl_name       = KERN_RANDOM,
 568                 .procname       = "random",
 569                 .mode           = 0555,
 570                 .child          = random_table,
 571         },
 572 #ifdef CONFIG_UNIX98_PTYS
 573         {
 574                 .ctl_name       = KERN_PTY,
 575                 .procname       = "pty",
 576                 .mode           = 0555,
 577                 .child          = pty_table,
 578         },
 579 #endif
 580         {
 581                 .ctl_name       = KERN_OVERFLOWUID,
 582                 .procname       = "overflowuid",
 583                 .data           = &overflowuid,
 584                 .maxlen         = sizeof(int),
 585                 .mode           = 0644,
 586                 .proc_handler   = &proc_dointvec_minmax,
 587                 .strategy       = &sysctl_intvec,
 588                 .extra1         = &minolduid,
 589                 .extra2         = &maxolduid,
 590         },
 591         {
 592                 .ctl_name       = KERN_OVERFLOWGID,
 593                 .procname       = "overflowgid",
 594                 .data           = &overflowgid,
 595                 .maxlen         = sizeof(int),
 596                 .mode           = 0644,
 597                 .proc_handler   = &proc_dointvec_minmax,
 598                 .strategy       = &sysctl_intvec,
 599                 .extra1         = &minolduid,
 600                 .extra2         = &maxolduid,
 601         },
 602 #ifdef CONFIG_S390
 603 #ifdef CONFIG_MATHEMU
 604         {
 605                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 606                 .procname       = "ieee_emulation_warnings",
 607                 .data           = &sysctl_ieee_emulation_warnings,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec,
 611         },
 612 #endif
 613 #ifdef CONFIG_NO_IDLE_HZ
 614         {
 615                 .ctl_name       = KERN_HZ_TIMER,
 616                 .procname       = "hz_timer",
 617                 .data           = &sysctl_hz_timer,
 618                 .maxlen         = sizeof(int),
 619                 .mode           = 0644,
 620                 .proc_handler   = &proc_dointvec,
 621         },
 622 #endif
 623         {
 624                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 625                 .procname       = "userprocess_debug",
 626                 .data           = &sysctl_userprocess_debug,
 627                 .maxlen         = sizeof(int),
 628                 .mode           = 0644,
 629                 .proc_handler   = &proc_dointvec,
 630         },
 631 #endif
 632         {
 633                 .ctl_name       = KERN_PIDMAX,
 634                 .procname       = "pid_max",
 635                 .data           = &pid_max,
 636                 .maxlen         = sizeof (int),
 637                 .mode           = 0644,
 638                 .proc_handler   = &proc_dointvec_minmax,
 639                 .strategy       = sysctl_intvec,
 640                 .extra1         = &pid_max_min,
 641                 .extra2         = &pid_max_max,
 642         },
 643         {
 644                 .ctl_name       = KERN_PANIC_ON_OOPS,
 645                 .procname       = "panic_on_oops",
 646                 .data           = &panic_on_oops,
 647                 .maxlen         = sizeof(int),
 648                 .mode           = 0644,
 649                 .proc_handler   = &proc_dointvec,
 650         },
 651         {
 652                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 653                 .procname       = "printk_ratelimit",
 654                 .data           = &printk_ratelimit_jiffies,
 655                 .maxlen         = sizeof(int),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_dointvec_jiffies,
 658                 .strategy       = &sysctl_jiffies,
 659         },
 660         {
 661                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 662                 .procname       = "printk_ratelimit_burst",
 663                 .data           = &printk_ratelimit_burst,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 .proc_handler   = &proc_dointvec,
 667         },
 668         {
 669                 .ctl_name       = KERN_NGROUPS_MAX,
 670                 .procname       = "ngroups_max",
 671                 .data           = &ngroups_max,
 672                 .maxlen         = sizeof (int),
 673                 .mode           = 0444,
 674                 .proc_handler   = &proc_dointvec,
 675         },
 676 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 677         {
 678                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 679                 .procname       = "unknown_nmi_panic",
 680                 .data           = &unknown_nmi_panic,
 681                 .maxlen         = sizeof (int),
 682                 .mode           = 0644,
 683                 .proc_handler   = &proc_dointvec,
 684         },
 685         {
 686                 .ctl_name       = KERN_NMI_WATCHDOG,
 687                 .procname       = "nmi_watchdog",
 688                 .data           = &nmi_watchdog_enabled,
 689                 .maxlen         = sizeof (int),
 690                 .mode           = 0644,
 691                 .proc_handler   = &proc_nmi_enabled,
 692         },
 693 #endif
 694 #if defined(CONFIG_X86)
 695         {
 696                 .ctl_name       = KERN_PANIC_ON_NMI,
 697                 .procname       = "panic_on_unrecovered_nmi",
 698                 .data           = &panic_on_unrecovered_nmi,
 699                 .maxlen         = sizeof(int),
 700                 .mode           = 0644,
 701                 .proc_handler   = &proc_dointvec,
 702         },
 703         {
 704                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 705                 .procname       = "bootloader_type",
 706                 .data           = &bootloader_type,
 707                 .maxlen         = sizeof (int),
 708                 .mode           = 0444,
 709                 .proc_handler   = &proc_dointvec,
 710         },
 711         {
 712                 .ctl_name       = CTL_UNNUMBERED,
 713                 .procname       = "kstack_depth_to_print",
 714                 .data           = &kstack_depth_to_print,
 715                 .maxlen         = sizeof(int),
 716                 .mode           = 0644,
 717                 .proc_handler   = &proc_dointvec,
 718         },
 719 #endif
 720 #if defined(CONFIG_MMU)
 721         {
 722                 .ctl_name       = KERN_RANDOMIZE,
 723                 .procname       = "randomize_va_space",
 724                 .data           = &randomize_va_space,
 725                 .maxlen         = sizeof(int),
 726                 .mode           = 0644,
 727                 .proc_handler   = &proc_dointvec,
 728         },
 729 #endif
 730 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 731         {
 732                 .ctl_name       = KERN_SPIN_RETRY,
 733                 .procname       = "spin_retry",
 734                 .data           = &spin_retry,
 735                 .maxlen         = sizeof (int),
 736                 .mode           = 0644,
 737                 .proc_handler   = &proc_dointvec,
 738         },
 739 #endif
 740 #ifdef CONFIG_ACPI_SLEEP
 741         {
 742                 .ctl_name       = KERN_ACPI_VIDEO_FLAGS,
 743                 .procname       = "acpi_video_flags",
 744                 .data           = &acpi_video_flags,
 745                 .maxlen         = sizeof (unsigned long),
 746                 .mode           = 0644,
 747                 .proc_handler   = &proc_doulongvec_minmax,
 748         },
 749 #endif
 750 #ifdef CONFIG_IA64
 751         {
 752                 .ctl_name       = KERN_IA64_UNALIGNED,
 753                 .procname       = "ignore-unaligned-usertrap",
 754                 .data           = &no_unaligned_warning,
 755                 .maxlen         = sizeof (int),
 756                 .mode           = 0644,
 757                 .proc_handler   = &proc_dointvec,
 758         },
 759 #endif
 760 #ifdef CONFIG_COMPAT
 761         {
 762                 .ctl_name       = KERN_COMPAT_LOG,
 763                 .procname       = "compat-log",
 764                 .data           = &compat_log,
 765                 .maxlen         = sizeof (int),
 766                 .mode           = 0644,
 767                 .proc_handler   = &proc_dointvec,
 768         },
 769 #endif
 770 #ifdef CONFIG_RT_MUTEXES
 771         {
 772                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 773                 .procname       = "max_lock_depth",
 774                 .data           = &max_lock_depth,
 775                 .maxlen         = sizeof(int),
 776                 .mode           = 0644,
 777                 .proc_handler   = &proc_dointvec,
 778         },
 779 #endif
 780
 781         { .ctl_name = 0 }
 782 };
 783
 784 /* Constants for minimum and maximum testing in vm_table.
 785    We use these as one-element integer vectors. */
 786 static int zero;
 787 static int one_hundred = 100;
 788
 789
 790 static ctl_table vm_table[] = {
 791         {
 792                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 793                 .procname       = "overcommit_memory",
 794                 .data           = &sysctl_overcommit_memory,
 795                 .maxlen         = sizeof(sysctl_overcommit_memory),
 796                 .mode           = 0644,
 797                 .proc_handler   = &proc_dointvec,
 798         },
 799         {
 800                 .ctl_name       = VM_PANIC_ON_OOM,
 801                 .procname       = "panic_on_oom",
 802                 .data           = &sysctl_panic_on_oom,
 803                 .maxlen         = sizeof(sysctl_panic_on_oom),
 804                 .mode           = 0644,
 805                 .proc_handler   = &proc_dointvec,
 806         },
 807         {
 808                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 809                 .procname       = "overcommit_ratio",
 810                 .data           = &sysctl_overcommit_ratio,
 811                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 812                 .mode           = 0644,
 813                 .proc_handler   = &proc_dointvec,
 814         },
 815         {
 816                 .ctl_name       = VM_PAGE_CLUSTER,
 817                 .procname       = "page-cluster",
 818                 .data           = &page_cluster,
 819                 .maxlen         = sizeof(int),
 820                 .mode           = 0644,
 821                 .proc_handler   = &proc_dointvec,
 822         },
 823         {
 824                 .ctl_name       = VM_DIRTY_BACKGROUND,
 825                 .procname       = "dirty_background_ratio",
 826                 .data           = &dirty_background_ratio,
 827                 .maxlen         = sizeof(dirty_background_ratio),
 828                 .mode           = 0644,
 829                 .proc_handler   = &proc_dointvec_minmax,
 830                 .strategy       = &sysctl_intvec,
 831                 .extra1         = &zero,
 832                 .extra2         = &one_hundred,
 833         },
 834         {
 835                 .ctl_name       = VM_DIRTY_RATIO,
 836                 .procname       = "dirty_ratio",
 837                 .data           = &vm_dirty_ratio,
 838                 .maxlen         = sizeof(vm_dirty_ratio),
 839                 .mode           = 0644,
 840                 .proc_handler   = &proc_dointvec_minmax,
 841                 .strategy       = &sysctl_intvec,
 842                 .extra1         = &zero,
 843                 .extra2         = &one_hundred,
 844         },
 845         {
 846                 .ctl_name       = VM_DIRTY_WB_CS,
 847                 .procname       = "dirty_writeback_centisecs",
 848                 .data           = &dirty_writeback_interval,
 849                 .maxlen         = sizeof(dirty_writeback_interval),
 850                 .mode           = 0644,
 851                 .proc_handler   = &dirty_writeback_centisecs_handler,
 852         },
 853         {
 854                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
 855                 .procname       = "dirty_expire_centisecs",
 856                 .data           = &dirty_expire_interval,
 857                 .maxlen         = sizeof(dirty_expire_interval),
 858                 .mode           = 0644,
 859                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 860         },
 861         {
 862                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 863                 .procname       = "nr_pdflush_threads",
 864                 .data           = &nr_pdflush_threads,
 865                 .maxlen         = sizeof nr_pdflush_threads,
 866                 .mode           = 0444 /* read-only*/,
 867                 .proc_handler   = &proc_dointvec,
 868         },
 869         {
 870                 .ctl_name       = VM_SWAPPINESS,
 871                 .procname       = "swappiness",
 872                 .data           = &vm_swappiness,
 873                 .maxlen         = sizeof(vm_swappiness),
 874                 .mode           = 0644,
 875                 .proc_handler   = &proc_dointvec_minmax,
 876                 .strategy       = &sysctl_intvec,
 877                 .extra1         = &zero,
 878                 .extra2         = &one_hundred,
 879         },
 880 #ifdef CONFIG_HUGETLB_PAGE
 881          {
 882                 .ctl_name       = VM_HUGETLB_PAGES,
 883                 .procname       = "nr_hugepages",
 884                 .data           = &max_huge_pages,
 885                 .maxlen         = sizeof(unsigned long),
 886                 .mode           = 0644,
 887                 .proc_handler   = &hugetlb_sysctl_handler,
 888                 .extra1         = (void *)&hugetlb_zero,
 889                 .extra2         = (void *)&hugetlb_infinity,
 890          },
 891          {
 892                 .ctl_name       = VM_HUGETLB_GROUP,
 893                 .procname       = "hugetlb_shm_group",
 894                 .data           = &sysctl_hugetlb_shm_group,
 895                 .maxlen         = sizeof(gid_t),
 896                 .mode           = 0644,
 897                 .proc_handler   = &proc_dointvec,
 898          },
 899 #endif
 900         {
 901                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 902                 .procname       = "lowmem_reserve_ratio",
 903                 .data           = &sysctl_lowmem_reserve_ratio,
 904                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 905                 .mode           = 0644,
 906                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 907                 .strategy       = &sysctl_intvec,
 908         },
 909         {
 910                 .ctl_name       = VM_DROP_PAGECACHE,
 911                 .procname       = "drop_caches",
 912                 .data           = &sysctl_drop_caches,
 913                 .maxlen         = sizeof(int),
 914                 .mode           = 0644,
 915                 .proc_handler   = drop_caches_sysctl_handler,
 916                 .strategy       = &sysctl_intvec,
 917         },
 918         {
 919                 .ctl_name       = VM_MIN_FREE_KBYTES,
 920                 .procname       = "min_free_kbytes",
 921                 .data           = &min_free_kbytes,
 922                 .maxlen         = sizeof(min_free_kbytes),
 923                 .mode           = 0644,
 924                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 925                 .strategy       = &sysctl_intvec,
 926                 .extra1         = &zero,
 927         },
 928         {
 929                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 930                 .procname       = "percpu_pagelist_fraction",
 931                 .data           = &percpu_pagelist_fraction,
 932                 .maxlen         = sizeof(percpu_pagelist_fraction),
 933                 .mode           = 0644,
 934                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 935                 .strategy       = &sysctl_intvec,
 936                 .extra1         = &min_percpu_pagelist_fract,
 937         },
 938 #ifdef CONFIG_MMU
 939         {
 940                 .ctl_name       = VM_MAX_MAP_COUNT,
 941                 .procname       = "max_map_count",
 942                 .data           = &sysctl_max_map_count,
 943                 .maxlen         = sizeof(sysctl_max_map_count),
 944                 .mode           = 0644,
 945                 .proc_handler   = &proc_dointvec
 946         },
 947 #endif
 948         {
 949                 .ctl_name       = VM_LAPTOP_MODE,
 950                 .procname       = "laptop_mode",
 951                 .data           = &laptop_mode,
 952                 .maxlen         = sizeof(laptop_mode),
 953                 .mode           = 0644,
 954                 .proc_handler   = &proc_dointvec_jiffies,
 955                 .strategy       = &sysctl_jiffies,
 956         },
 957         {
 958                 .ctl_name       = VM_BLOCK_DUMP,
 959                 .procname       = "block_dump",
 960                 .data           = &block_dump,
 961                 .maxlen         = sizeof(block_dump),
 962                 .mode           = 0644,
 963                 .proc_handler   = &proc_dointvec,
 964                 .strategy       = &sysctl_intvec,
 965                 .extra1         = &zero,
 966         },
 967         {
 968                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 969                 .procname       = "vfs_cache_pressure",
 970                 .data           = &sysctl_vfs_cache_pressure,
 971                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 972                 .mode           = 0644,
 973                 .proc_handler   = &proc_dointvec,
 974                 .strategy       = &sysctl_intvec,
 975                 .extra1         = &zero,
 976         },
 977 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 978         {
 979                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 980                 .procname       = "legacy_va_layout",
 981                 .data           = &sysctl_legacy_va_layout,
 982                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 983                 .mode           = 0644,
 984                 .proc_handler   = &proc_dointvec,
 985                 .strategy       = &sysctl_intvec,
 986                 .extra1         = &zero,
 987         },
 988 #endif
 989 #ifdef CONFIG_NUMA
 990         {
 991                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
 992                 .procname       = "zone_reclaim_mode",
 993                 .data           = &zone_reclaim_mode,
 994                 .maxlen         = sizeof(zone_reclaim_mode),
 995                 .mode           = 0644,
 996                 .proc_handler   = &proc_dointvec,
 997                 .strategy       = &sysctl_intvec,
 998                 .extra1         = &zero,
 999         },
1000         {
1001                 .ctl_name       = VM_MIN_UNMAPPED,
1002                 .procname       = "min_unmapped_ratio",
1003                 .data           = &sysctl_min_unmapped_ratio,
1004                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1005                 .mode           = 0644,
1006                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1007                 .strategy       = &sysctl_intvec,
1008                 .extra1         = &zero,
1009                 .extra2         = &one_hundred,
1010         },
1011         {
1012                 .ctl_name       = VM_MIN_SLAB,
1013                 .procname       = "min_slab_ratio",
1014                 .data           = &sysctl_min_slab_ratio,
1015                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1016                 .mode           = 0644,
1017                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1018                 .strategy       = &sysctl_intvec,
1019                 .extra1         = &zero,
1020                 .extra2         = &one_hundred,
1021         },
1022 #endif
1023 #ifdef CONFIG_X86_32
1024         {
1025                 .ctl_name       = VM_VDSO_ENABLED,
1026                 .procname       = "vdso_enabled",
1027                 .data           = &vdso_enabled,
1028                 .maxlen         = sizeof(vdso_enabled),
1029                 .mode           = 0644,
1030                 .proc_handler   = &proc_dointvec,
1031                 .strategy       = &sysctl_intvec,
1032                 .extra1         = &zero,
1033         },
1034 #endif
1035         { .ctl_name = 0 }
1036 };
1037
1038 static ctl_table fs_table[] = {
1039         {
1040                 .ctl_name       = FS_NRINODE,
1041                 .procname       = "inode-nr",
1042                 .data           = &inodes_stat,
1043                 .maxlen         = 2*sizeof(int),
1044                 .mode           = 0444,
1045                 .proc_handler   = &proc_dointvec,
1046         },
1047         {
1048                 .ctl_name       = FS_STATINODE,
1049                 .procname       = "inode-state",
1050                 .data           = &inodes_stat,
1051                 .maxlen         = 7*sizeof(int),
1052                 .mode           = 0444,
1053                 .proc_handler   = &proc_dointvec,
1054         },
1055         {
1056                 .ctl_name       = FS_NRFILE,
1057                 .procname       = "file-nr",
1058                 .data           = &files_stat,
1059                 .maxlen         = 3*sizeof(int),
1060                 .mode           = 0444,
1061                 .proc_handler   = &proc_nr_files,
1062         },
1063         {
1064                 .ctl_name       = FS_MAXFILE,
1065                 .procname       = "file-max",
1066                 .data           = &files_stat.max_files,
1067                 .maxlen         = sizeof(int),
1068                 .mode           = 0644,
1069                 .proc_handler   = &proc_dointvec,
1070         },
1071         {
1072                 .ctl_name       = FS_DENTRY,
1073                 .procname       = "dentry-state",
1074                 .data           = &dentry_stat,
1075                 .maxlen         = 6*sizeof(int),
1076                 .mode           = 0444,
1077                 .proc_handler   = &proc_dointvec,
1078         },
1079         {
1080                 .ctl_name       = FS_OVERFLOWUID,
1081                 .procname       = "overflowuid",
1082                 .data           = &fs_overflowuid,
1083                 .maxlen         = sizeof(int),
1084                 .mode           = 0644,
1085                 .proc_handler   = &proc_dointvec_minmax,
1086                 .strategy       = &sysctl_intvec,
1087                 .extra1         = &minolduid,
1088                 .extra2         = &maxolduid,
1089         },
1090         {
1091                 .ctl_name       = FS_OVERFLOWGID,
1092                 .procname       = "overflowgid",
1093                 .data           = &fs_overflowgid,
1094                 .maxlen         = sizeof(int),
1095                 .mode           = 0644,
1096                 .proc_handler   = &proc_dointvec_minmax,
1097                 .strategy       = &sysctl_intvec,
1098                 .extra1         = &minolduid,
1099                 .extra2         = &maxolduid,
1100         },
1101         {
1102                 .ctl_name       = FS_LEASES,
1103                 .procname       = "leases-enable",
1104                 .data           = &leases_enable,
1105                 .maxlen         = sizeof(int),
1106                 .mode           = 0644,
1107                 .proc_handler   = &proc_dointvec,
1108         },
1109 #ifdef CONFIG_DNOTIFY
1110         {
1111                 .ctl_name       = FS_DIR_NOTIFY,
1112                 .procname       = "dir-notify-enable",
1113                 .data           = &dir_notify_enable,
1114                 .maxlen         = sizeof(int),
1115                 .mode           = 0644,
1116                 .proc_handler   = &proc_dointvec,
1117         },
1118 #endif
1119 #ifdef CONFIG_MMU
1120         {
1121                 .ctl_name       = FS_LEASE_TIME,
1122                 .procname       = "lease-break-time",
1123                 .data           = &lease_break_time,
1124                 .maxlen         = sizeof(int),
1125                 .mode           = 0644,
1126                 .proc_handler   = &proc_dointvec,
1127         },
1128         {
1129                 .ctl_name       = FS_AIO_NR,
1130                 .procname       = "aio-nr",
1131                 .data           = &aio_nr,
1132                 .maxlen         = sizeof(aio_nr),
1133                 .mode           = 0444,
1134                 .proc_handler   = &proc_doulongvec_minmax,
1135         },
1136         {
1137                 .ctl_name       = FS_AIO_MAX_NR,
1138                 .procname       = "aio-max-nr",
1139                 .data           = &aio_max_nr,
1140                 .maxlen         = sizeof(aio_max_nr),
1141                 .mode           = 0644,
1142                 .proc_handler   = &proc_doulongvec_minmax,
1143         },
1144 #ifdef CONFIG_INOTIFY_USER
1145         {
1146                 .ctl_name       = FS_INOTIFY,
1147                 .procname       = "inotify",
1148                 .mode           = 0555,
1149                 .child          = inotify_table,
1150         },
1151 #endif
1152 #endif
1153         {
1154                 .ctl_name       = KERN_SETUID_DUMPABLE,
1155                 .procname       = "suid_dumpable",
1156                 .data           = &suid_dumpable,
1157                 .maxlen         = sizeof(int),
1158                 .mode           = 0644,
1159                 .proc_handler   = &proc_dointvec,
1160         },
1161         { .ctl_name = 0 }
1162 };
1163
1164 static ctl_table debug_table[] = {
1165         { .ctl_name = 0 }
1166 };
1167
1168 static ctl_table dev_table[] = {
1169         { .ctl_name = 0 }
1170 };
1171
1172 extern void init_irq_proc (void);
1173
1174 static DEFINE_SPINLOCK(sysctl_lock);
1175
1176 /* called under sysctl_lock */
1177 static int use_table(struct ctl_table_header *p)
1178 {
1179         if (unlikely(p->unregistering))
1180                 return 0;
1181         p->used++;
1182         return 1;
1183 }
1184
1185 /* called under sysctl_lock */
1186 static void unuse_table(struct ctl_table_header *p)
1187 {
1188         if (!--p->used)
1189                 if (unlikely(p->unregistering))
1190                         complete(p->unregistering);
1191 }
1192
1193 /* called under sysctl_lock, will reacquire if has to wait */
1194 static void start_unregistering(struct ctl_table_header *p)
1195 {
1196         /*
1197          * if p->used is 0, nobody will ever touch that entry again;
1198          * we'll eliminate all paths to it before dropping sysctl_lock
1199          */
1200         if (unlikely(p->used)) {
1201                 struct completion wait;
1202                 init_completion(&wait);
1203                 p->unregistering = &wait;
1204                 spin_unlock(&sysctl_lock);
1205                 wait_for_completion(&wait);
1206                 spin_lock(&sysctl_lock);
1207         }
1208         /*
1209          * do not remove from the list until nobody holds it; walking the
1210          * list in do_sysctl() relies on that.
1211          */
1212         list_del_init(&p->ctl_entry);
1213 }
1214
1215 void __init sysctl_init(void)
1216 {
1217 #ifdef CONFIG_PROC_SYSCTL
1218         register_proc_table(root_table, proc_sys_root, &root_table_header);
1219         init_irq_proc();
1220 #endif
1221 }
1222
1223 #ifdef CONFIG_SYSCTL_SYSCALL
1224 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1225                void __user *newval, size_t newlen)
1226 {
1227         struct list_head *tmp;
1228         int error = -ENOTDIR;
1229
1230         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1231                 return -ENOTDIR;
1232         if (oldval) {
1233                 int old_len;
1234                 if (!oldlenp || get_user(old_len, oldlenp))
1235                         return -EFAULT;
1236         }
1237         spin_lock(&sysctl_lock);
1238         tmp = &root_table_header.ctl_entry;
1239         do {
1240                 struct ctl_table_header *head =
1241                         list_entry(tmp, struct ctl_table_header, ctl_entry);
1242                 void *context = NULL;
1243
1244                 if (!use_table(head))
1245                         continue;
1246
1247                 spin_unlock(&sysctl_lock);
1248
1249                 error = parse_table(name, nlen, oldval, oldlenp,
1250                                         newval, newlen, head->ctl_table,
1251                                         &context);
1252                 kfree(context);
1253
1254                 spin_lock(&sysctl_lock);
1255                 unuse_table(head);
1256                 if (error != -ENOTDIR)
1257                         break;
1258         } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1259         spin_unlock(&sysctl_lock);
1260         return error;
1261 }
1262
1263 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1264 {
1265         struct __sysctl_args tmp;
1266         int error;
1267
1268         if (copy_from_user(&tmp, args, sizeof(tmp)))
1269                 return -EFAULT;
1270
1271         lock_kernel();
1272         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1273                           tmp.newval, tmp.newlen);
1274         unlock_kernel();
1275         return error;
1276 }
1277 #endif /* CONFIG_SYSCTL_SYSCALL */
1278
1279 /*
1280  * ctl_perm does NOT grant the superuser all rights automatically, because
1281  * some sysctl variables are readonly even to root.
1282  */
1283
1284 static int test_perm(int mode, int op)
1285 {
1286         if (!current->euid)
1287                 mode >>= 6;
1288         else if (in_egroup_p(0))
1289                 mode >>= 3;
1290         if ((mode & op & 0007) == op)
1291                 return 0;
1292         return -EACCES;
1293 }
1294
1295 static inline int ctl_perm(ctl_table *table, int op)
1296 {
1297         int error;
1298         error = security_sysctl(table, op);
1299         if (error)
1300                 return error;
1301         return test_perm(table->mode, op);
1302 }
1303
1304 #ifdef CONFIG_SYSCTL_SYSCALL
1305 static int parse_table(int __user *name, int nlen,
1306                        void __user *oldval, size_t __user *oldlenp,
1307                        void __user *newval, size_t newlen,
1308                        ctl_table *table, void **context)
1309 {
1310         int n;
1311 repeat:
1312         if (!nlen)
1313                 return -ENOTDIR;
1314         if (get_user(n, name))
1315                 return -EFAULT;
1316         for ( ; table->ctl_name || table->procname; table++) {
1317                 if (!table->ctl_name)
1318                         continue;
1319                 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1320                         int error;
1321                         if (table->child) {
1322                                 if (ctl_perm(table, 001))
1323                                         return -EPERM;
1324                                 if (table->strategy) {
1325                                         error = table->strategy(
1326                                                 table, name, nlen,
1327                                                 oldval, oldlenp,
1328                                                 newval, newlen, context);
1329                                         if (error)
1330                                                 return error;
1331                                 }
1332                                 name++;
1333                                 nlen--;
1334                                 table = table->child;
1335                                 goto repeat;
1336                         }
1337                         error = do_sysctl_strategy(table, name, nlen,
1338                                                    oldval, oldlenp,
1339                                                    newval, newlen, context);
1340                         return error;
1341                 }
1342         }
1343         return -ENOTDIR;
1344 }
1345
1346 /* Perform the actual read/write of a sysctl table entry. */
1347 int do_sysctl_strategy (ctl_table *table,
1348                         int __user *name, int nlen,
1349                         void __user *oldval, size_t __user *oldlenp,
1350                         void __user *newval, size_t newlen, void **context)
1351 {
1352         int op = 0, rc;
1353         size_t len;
1354
1355         if (oldval)
1356                 op |= 004;
1357         if (newval)
1358                 op |= 002;
1359         if (ctl_perm(table, op))
1360                 return -EPERM;
1361
1362         if (table->strategy) {
1363                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1364                                      newval, newlen, context);
1365                 if (rc < 0)
1366                         return rc;
1367                 if (rc > 0)
1368                         return 0;
1369         }
1370
1371         /* If there is no strategy routine, or if the strategy returns
1372          * zero, proceed with automatic r/w */
1373         if (table->data && table->maxlen) {
1374                 if (oldval && oldlenp) {
1375                         if (get_user(len, oldlenp))
1376                                 return -EFAULT;
1377                         if (len) {
1378                                 if (len > table->maxlen)
1379                                         len = table->maxlen;
1380                                 if(copy_to_user(oldval, table->data, len))
1381                                         return -EFAULT;
1382                                 if(put_user(len, oldlenp))
1383                                         return -EFAULT;
1384                         }
1385                 }
1386                 if (newval && newlen) {
1387                         len = newlen;
1388                         if (len > table->maxlen)
1389                                 len = table->maxlen;
1390                         if(copy_from_user(table->data, newval, len))
1391                                 return -EFAULT;
1392                 }
1393         }
1394         return 0;
1395 }
1396 #endif /* CONFIG_SYSCTL_SYSCALL */
1397
1398 /**
1399  * register_sysctl_table - register a sysctl hierarchy
1400  * @table: the top-level table structure
1401  * @insert_at_head: whether the entry should be inserted in front or at the end
1402  *
1403  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1404  * array. An entry with a ctl_name of 0 terminates the table.
1405  *
1406  * The members of the &ctl_table structure are used as follows:
1407  *
1408  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1409  *            must be unique within that level of sysctl
1410  *
1411  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1412  *            enter a sysctl file
1413  *
1414  * data - a pointer to data for use by proc_handler
1415  *
1416  * maxlen - the maximum size in bytes of the data
1417  *
1418  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1419  *
1420  * child - a pointer to the child sysctl table if this entry is a directory, or
1421  *         %NULL.
1422  *
1423  * proc_handler - the text handler routine (described below)
1424  *
1425  * strategy - the strategy routine (described below)
1426  *
1427  * de - for internal use by the sysctl routines
1428  *
1429  * extra1, extra2 - extra pointers usable by the proc handler routines
1430  *
1431  * Leaf nodes in the sysctl tree will be represented by a single file
1432  * under /proc; non-leaf nodes will be represented by directories.
1433  *
1434  * sysctl(2) can automatically manage read and write requests through
1435  * the sysctl table.  The data and maxlen fields of the ctl_table
1436  * struct enable minimal validation of the values being written to be
1437  * performed, and the mode field allows minimal authentication.
1438  *
1439  * More sophisticated management can be enabled by the provision of a
1440  * strategy routine with the table entry.  This will be called before
1441  * any automatic read or write of the data is performed.
1442  *
1443  * The strategy routine may return
1444  *
1445  * < 0 - Error occurred (error is passed to user process)
1446  *
1447  * 0   - OK - proceed with automatic read or write.
1448  *
1449  * > 0 - OK - read or write has been done by the strategy routine, so
1450  *       return immediately.
1451  *
1452  * There must be a proc_handler routine for any terminal nodes
1453  * mirrored under /proc/sys (non-terminals are handled by a built-in
1454  * directory handler).  Several default handlers are available to
1455  * cover common cases -
1456  *
1457  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1458  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1459  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1460  *
1461  * It is the handler's job to read the input buffer from user memory
1462  * and process it. The handler should return 0 on success.
1463  *
1464  * This routine returns %NULL on a failure to register, and a pointer
1465  * to the table header on success.
1466  */
1467 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1468                                                int insert_at_head)
1469 {
1470         struct ctl_table_header *tmp;
1471         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1472         if (!tmp)
1473                 return NULL;
1474         tmp->ctl_table = table;
1475         INIT_LIST_HEAD(&tmp->ctl_entry);
1476         tmp->used = 0;
1477         tmp->unregistering = NULL;
1478         spin_lock(&sysctl_lock);
1479         if (insert_at_head)
1480                 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1481         else
1482                 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1483         spin_unlock(&sysctl_lock);
1484 #ifdef CONFIG_PROC_SYSCTL
1485         register_proc_table(table, proc_sys_root, tmp);
1486 #endif
1487         return tmp;
1488 }
1489
1490 /**
1491  * unregister_sysctl_table - unregister a sysctl table hierarchy
1492  * @header: the header returned from register_sysctl_table
1493  *
1494  * Unregisters the sysctl table and all children. proc entries may not
1495  * actually be removed until they are no longer used by anyone.
1496  */
1497 void unregister_sysctl_table(struct ctl_table_header * header)
1498 {
1499         might_sleep();
1500         spin_lock(&sysctl_lock);
1501         start_unregistering(header);
1502 #ifdef CONFIG_PROC_SYSCTL
1503         unregister_proc_table(header->ctl_table, proc_sys_root);
1504 #endif
1505         spin_unlock(&sysctl_lock);
1506         kfree(header);
1507 }
1508
1509 #else /* !CONFIG_SYSCTL */
1510 struct ctl_table_header * register_sysctl_table(ctl_table * table,
1511                                                 int insert_at_head)
1512 {
1513         return NULL;
1514 }
1515
1516 void unregister_sysctl_table(struct ctl_table_header * table)
1517 {
1518 }
1519
1520 #endif /* CONFIG_SYSCTL */
1521
1522 /*
1523  * /proc/sys support
1524  */
1525
1526 #ifdef CONFIG_PROC_SYSCTL
1527
1528 /* Scan the sysctl entries in table and add them all into /proc */
1529 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1530 {
1531         struct proc_dir_entry *de;
1532         int len;
1533         mode_t mode;
1534
1535         for (; table->ctl_name || table->procname; table++) {
1536                 /* Can't do anything without a proc name. */
1537                 if (!table->procname)
1538                         continue;
1539                 /* Maybe we can't do anything with it... */
1540                 if (!table->proc_handler && !table->child) {
1541                         printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1542                                 table->procname);
1543                         continue;
1544                 }
1545
1546                 len = strlen(table->procname);
1547                 mode = table->mode;
1548
1549                 de = NULL;
1550                 if (table->proc_handler)
1551                         mode |= S_IFREG;
1552                 else {
1553                         mode |= S_IFDIR;
1554                         for (de = root->subdir; de; de = de->next) {
1555                                 if (proc_match(len, table->procname, de))
1556                                         break;
1557                         }
1558                         /* If the subdir exists already, de is non-NULL */
1559                 }
1560
1561                 if (!de) {
1562                         de = create_proc_entry(table->procname, mode, root);
1563                         if (!de)
1564                                 continue;
1565                         de->set = set;
1566                         de->data = (void *) table;
1567                         if (table->proc_handler)
1568                                 de->proc_fops = &proc_sys_file_operations;
1569                 }
1570                 table->de = de;
1571                 if (de->mode & S_IFDIR)
1572                         register_proc_table(table->child, de, set);
1573         }
1574 }
1575
1576 /*
1577  * Unregister a /proc sysctl table and any subdirectories.
1578  */
1579 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1580 {
1581         struct proc_dir_entry *de;
1582         for (; table->ctl_name || table->procname; table++) {
1583                 if (!(de = table->de))
1584                         continue;
1585                 if (de->mode & S_IFDIR) {
1586                         if (!table->child) {
1587                                 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1588                                 continue;
1589                         }
1590                         unregister_proc_table(table->child, de);
1591
1592                         /* Don't unregister directories which still have entries.. */
1593                         if (de->subdir)
1594                                 continue;
1595                 }
1596
1597                 /*
1598                  * In any case, mark the entry as goner; we'll keep it
1599                  * around if it's busy, but we'll know to do nothing with
1600                  * its fields.  We are under sysctl_lock here.
1601                  */
1602                 de->data = NULL;
1603
1604                 /* Don't unregister proc entries that are still being used.. */
1605                 if (atomic_read(&de->count))
1606                         continue;
1607
1608                 table->de = NULL;
1609                 remove_proc_entry(table->procname, root);
1610         }
1611 }
1612
1613 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1614                           size_t count, loff_t *ppos)
1615 {
1616         int op;
1617         struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
1618         struct ctl_table *table;
1619         size_t res;
1620         ssize_t error = -ENOTDIR;
1621
1622         spin_lock(&sysctl_lock);
1623         if (de && de->data && use_table(de->set)) {
1624                 /*
1625                  * at that point we know that sysctl was not unregistered
1626                  * and won't be until we finish
1627                  */
1628                 spin_unlock(&sysctl_lock);
1629                 table = (struct ctl_table *) de->data;
1630                 if (!table || !table->proc_handler)
1631                         goto out;
1632                 error = -EPERM;
1633                 op = (write ? 002 : 004);
1634                 if (ctl_perm(table, op))
1635                         goto out;
1636
1637                 /* careful: calling conventions are nasty here */
1638                 res = count;
1639                 error = (*table->proc_handler)(table, write, file,
1640                                                 buf, &res, ppos);
1641                 if (!error)
1642                         error = res;
1643         out:
1644                 spin_lock(&sysctl_lock);
1645                 unuse_table(de->set);
1646         }
1647         spin_unlock(&sysctl_lock);
1648         return error;
1649 }
1650
1651 static int proc_opensys(struct inode *inode, struct file *file)
1652 {
1653         if (file->f_mode & FMODE_WRITE) {
1654                 /*
1655                  * sysctl entries that are not writable,
1656                  * are _NOT_ writable, capabilities or not.
1657                  */
1658                 if (!(inode->i_mode & S_IWUSR))
1659                         return -EPERM;
1660         }
1661
1662         return 0;
1663 }
1664
1665 static ssize_t proc_readsys(struct file * file, char __user * buf,
1666                             size_t count, loff_t *ppos)
1667 {
1668         return do_rw_proc(0, file, buf, count, ppos);
1669 }
1670
1671 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1672                              size_t count, loff_t *ppos)
1673 {
1674         return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1675 }
1676
1677 static int _proc_do_string(void* data, int maxlen, int write,
1678                            struct file *filp, void __user *buffer,
1679                            size_t *lenp, loff_t *ppos)
1680 {
1681         size_t len;
1682         char __user *p;
1683         char c;
1684
1685         if (!data || !maxlen || !*lenp ||
1686             (*ppos && !write)) {
1687                 *lenp = 0;
1688                 return 0;
1689         }
1690
1691         if (write) {
1692                 len = 0;
1693                 p = buffer;
1694                 while (len < *lenp) {
1695                         if (get_user(c, p++))
1696                                 return -EFAULT;
1697                         if (c == 0 || c == '\n')
1698                                 break;
1699                         len++;
1700                 }
1701                 if (len >= maxlen)
1702                         len = maxlen-1;
1703                 if(copy_from_user(data, buffer, len))
1704                         return -EFAULT;
1705                 ((char *) data)[len] = 0;
1706                 *ppos += *lenp;
1707         } else {
1708                 len = strlen(data);
1709                 if (len > maxlen)
1710                         len = maxlen;
1711                 if (len > *lenp)
1712                         len = *lenp;
1713                 if (len)
1714                         if(copy_to_user(buffer, data, len))
1715                                 return -EFAULT;
1716                 if (len < *lenp) {
1717                         if(put_user('\n', ((char __user *) buffer) + len))
1718                                 return -EFAULT;
1719                         len++;
1720                 }
1721                 *lenp = len;
1722                 *ppos += len;
1723         }
1724         return 0;
1725 }
1726
1727 /**
1728  * proc_dostring - read a string sysctl
1729  * @table: the sysctl table
1730  * @write: %TRUE if this is a write to the sysctl file
1731  * @filp: the file structure
1732  * @buffer: the user buffer
1733  * @lenp: the size of the user buffer
1734  * @ppos: file position
1735  *
1736  * Reads/writes a string from/to the user buffer. If the kernel
1737  * buffer provided is not large enough to hold the string, the
1738  * string is truncated. The copied string is %NULL-terminated.
1739  * If the string is being read by the user process, it is copied
1740  * and a newline '\n' is added. It is truncated if the buffer is
1741  * not large enough.
1742  *
1743  * Returns 0 on success.
1744  */
1745 int proc_dostring(ctl_table *table, int write, struct file *filp,
1746                   void __user *buffer, size_t *lenp, loff_t *ppos)
1747 {
1748         return _proc_do_string(table->data, table->maxlen, write, filp,
1749                                buffer, lenp, ppos);
1750 }
1751
1752 /*
1753  *      Special case of dostring for the UTS structure. This has locks
1754  *      to observe. Should this be in kernel/sys.c ????
1755  */
1756
1757 #ifndef CONFIG_UTS_NS
1758 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
1759                   void __user *buffer, size_t *lenp, loff_t *ppos)
1760 {
1761         int r;
1762
1763         if (!write) {
1764                 down_read(&uts_sem);
1765                 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1766                 up_read(&uts_sem);
1767         } else {
1768                 down_write(&uts_sem);
1769                 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1770                 up_write(&uts_sem);
1771         }
1772         return r;
1773 }
1774 #else /* !CONFIG_UTS_NS */
1775 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
1776                   void __user *buffer, size_t *lenp, loff_t *ppos)
1777 {
1778         int r;
1779         struct uts_namespace* uts_ns = current->nsproxy->uts_ns;
1780         char* which;
1781
1782         switch (table->ctl_name) {
1783         case KERN_OSTYPE:
1784                 which = uts_ns->name.sysname;
1785                 break;
1786         case KERN_NODENAME:
1787                 which = uts_ns->name.nodename;
1788                 break;
1789         case KERN_OSRELEASE:
1790                 which = uts_ns->name.release;
1791                 break;
1792         case KERN_VERSION:
1793                 which = uts_ns->name.version;
1794                 break;
1795         case KERN_DOMAINNAME:
1796                 which = uts_ns->name.domainname;
1797                 break;
1798         default:
1799                 r = -EINVAL;
1800                 goto out;
1801         }
1802
1803         if (!write) {
1804                 down_read(&uts_sem);
1805                 r=_proc_do_string(which,table->maxlen,0,filp,buffer,lenp, ppos);
1806                 up_read(&uts_sem);
1807         } else {
1808                 down_write(&uts_sem);
1809                 r=_proc_do_string(which,table->maxlen,1,filp,buffer,lenp, ppos);
1810                 up_write(&uts_sem);
1811         }
1812  out:
1813         return r;
1814 }
1815 #endif /* !CONFIG_UTS_NS */
1816
1817 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1818                                  int *valp,
1819                                  int write, void *data)
1820 {
1821         if (write) {
1822                 *valp = *negp ? -*lvalp : *lvalp;
1823         } else {
1824                 int val = *valp;
1825                 if (val < 0) {
1826                         *negp = -1;
1827                         *lvalp = (unsigned long)-val;
1828                 } else {
1829                         *negp = 0;
1830                         *lvalp = (unsigned long)val;
1831                 }
1832         }
1833         return 0;
1834 }
1835
1836 static int __do_proc_dointvec(void *tbl_data, ctl_table *table,
1837                   int write, struct file *filp, void __user *buffer,
1838                   size_t *lenp, loff_t *ppos,
1839                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1840                               int write, void *data),
1841                   void *data)
1842 {
1843 #define TMPBUFLEN 21
1844         int *i, vleft, first=1, neg, val;
1845         unsigned long lval;
1846         size_t left, len;
1847
1848         char buf[TMPBUFLEN], *p;
1849         char __user *s = buffer;
1850
1851         if (!tbl_data || !table->maxlen || !*lenp ||
1852             (*ppos && !write)) {
1853                 *lenp = 0;
1854                 return 0;
1855         }
1856
1857         i = (int *) tbl_data;
1858         vleft = table->maxlen / sizeof(*i);
1859         left = *lenp;
1860
1861         if (!conv)
1862                 conv = do_proc_dointvec_conv;
1863
1864         for (; left && vleft--; i++, first=0) {
1865                 if (write) {
1866                         while (left) {
1867                                 char c;
1868                                 if (get_user(c, s))
1869                                         return -EFAULT;
1870                                 if (!isspace(c))
1871                                         break;
1872                                 left--;
1873                                 s++;
1874                         }
1875                         if (!left)
1876                                 break;
1877                         neg = 0;
1878                         len = left;
1879                         if (len > sizeof(buf) - 1)
1880                                 len = sizeof(buf) - 1;
1881                         if (copy_from_user(buf, s, len))
1882                                 return -EFAULT;
1883                         buf[len] = 0;
1884                         p = buf;
1885                         if (*p == '-' && left > 1) {
1886                                 neg = 1;
1887                                 p++;
1888                         }
1889                         if (*p < '0' || *p > '9')
1890                                 break;
1891
1892                         lval = simple_strtoul(p, &p, 0);
1893
1894                         len = p-buf;
1895                         if ((len < left) && *p && !isspace(*p))
1896                                 break;
1897                         if (neg)
1898                                 val = -val;
1899                         s += len;
1900                         left -= len;
1901
1902                         if (conv(&neg, &lval, i, 1, data))
1903                                 break;
1904                 } else {
1905                         p = buf;
1906                         if (!first)
1907                                 *p++ = '\t';
1908
1909                         if (conv(&neg, &lval, i, 0, data))
1910                                 break;
1911
1912                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1913                         len = strlen(buf);
1914                         if (len > left)
1915                                 len = left;
1916                         if(copy_to_user(s, buf, len))
1917                                 return -EFAULT;
1918                         left -= len;
1919                         s += len;
1920                 }
1921         }
1922
1923         if (!write && !first && left) {
1924                 if(put_user('\n', s))
1925                         return -EFAULT;
1926                 left--, s++;
1927         }
1928         if (write) {
1929                 while (left) {
1930                         char c;
1931                         if (get_user(c, s++))
1932                                 return -EFAULT;
1933                         if (!isspace(c))
1934                                 break;
1935                         left--;
1936                 }
1937         }
1938         if (write && first)
1939                 return -EINVAL;
1940         *lenp -= left;
1941         *ppos += *lenp;
1942         return 0;
1943 #undef TMPBUFLEN
1944 }
1945
1946 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1947                   void __user *buffer, size_t *lenp, loff_t *ppos,
1948                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1949                               int write, void *data),
1950                   void *data)
1951 {
1952         return __do_proc_dointvec(table->data, table, write, filp,
1953                         buffer, lenp, ppos, conv, data);
1954 }
1955
1956 /**
1957  * proc_dointvec - read a vector of integers
1958  * @table: the sysctl table
1959  * @write: %TRUE if this is a write to the sysctl file
1960  * @filp: the file structure
1961  * @buffer: the user buffer
1962  * @lenp: the size of the user buffer
1963  * @ppos: file position
1964  *
1965  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1966  * values from/to the user buffer, treated as an ASCII string.
1967  *
1968  * Returns 0 on success.
1969  */
1970 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1971                      void __user *buffer, size_t *lenp, loff_t *ppos)
1972 {
1973     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1974                             NULL,NULL);
1975 }
1976
1977 #define OP_SET  0
1978 #define OP_AND  1
1979 #define OP_OR   2
1980 #define OP_MAX  3
1981 #define OP_MIN  4
1982
1983 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1984                                       int *valp,
1985                                       int write, void *data)
1986 {
1987         int op = *(int *)data;
1988         if (write) {
1989                 int val = *negp ? -*lvalp : *lvalp;
1990                 switch(op) {
1991                 case OP_SET:    *valp = val; break;
1992                 case OP_AND:    *valp &= val; break;
1993                 case OP_OR:     *valp |= val; break;
1994                 case OP_MAX:    if(*valp < val)
1995                                         *valp = val;
1996                                 break;
1997                 case OP_MIN:    if(*valp > val)
1998                                 *valp = val;
1999                                 break;
2000                 }
2001         } else {
2002                 int val = *valp;
2003                 if (val < 0) {
2004                         *negp = -1;
2005                         *lvalp = (unsigned long)-val;
2006                 } else {
2007                         *negp = 0;
2008                         *lvalp = (unsigned long)val;
2009                 }
2010         }
2011         return 0;
2012 }
2013
2014 /*
2015  *      init may raise the set.
2016  */
2017
2018 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2019                         void __user *buffer, size_t *lenp, loff_t *ppos)
2020 {
2021         int op;
2022
2023         if (!capable(CAP_SYS_MODULE)) {
2024                 return -EPERM;
2025         }
2026
2027         op = is_init(current) ? OP_SET : OP_AND;
2028         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2029                                 do_proc_dointvec_bset_conv,&op);
2030 }
2031
2032 struct do_proc_dointvec_minmax_conv_param {
2033         int *min;
2034         int *max;
2035 };
2036
2037 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2038                                         int *valp,
2039                                         int write, void *data)
2040 {
2041         struct do_proc_dointvec_minmax_conv_param *param = data;
2042         if (write) {
2043                 int val = *negp ? -*lvalp : *lvalp;
2044                 if ((param->min && *param->min > val) ||
2045                     (param->max && *param->max < val))
2046                         return -EINVAL;
2047                 *valp = val;
2048         } else {
2049                 int val = *valp;
2050                 if (val < 0) {
2051                         *negp = -1;
2052                         *lvalp = (unsigned long)-val;
2053                 } else {
2054                         *negp = 0;
2055                         *lvalp = (unsigned long)val;
2056                 }
2057         }
2058         return 0;
2059 }
2060
2061 /**
2062  * proc_dointvec_minmax - read a vector of integers with min/max values
2063  * @table: the sysctl table
2064  * @write: %TRUE if this is a write to the sysctl file
2065  * @filp: the file structure
2066  * @buffer: the user buffer
2067  * @lenp: the size of the user buffer
2068  * @ppos: file position
2069  *
2070  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2071  * values from/to the user buffer, treated as an ASCII string.
2072  *
2073  * This routine will ensure the values are within the range specified by
2074  * table->extra1 (min) and table->extra2 (max).
2075  *
2076  * Returns 0 on success.
2077  */
2078 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2079                   void __user *buffer, size_t *lenp, loff_t *ppos)
2080 {
2081         struct do_proc_dointvec_minmax_conv_param param = {
2082                 .min = (int *) table->extra1,
2083                 .max = (int *) table->extra2,
2084         };
2085         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2086                                 do_proc_dointvec_minmax_conv, &param);
2087 }
2088
2089 static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write,
2090                                      struct file *filp,
2091                                      void __user *buffer,
2092                                      size_t *lenp, loff_t *ppos,
2093                                      unsigned long convmul,
2094                                      unsigned long convdiv)
2095 {
2096 #define TMPBUFLEN 21
2097         unsigned long *i, *min, *max, val;
2098         int vleft, first=1, neg;
2099         size_t len, left;
2100         char buf[TMPBUFLEN], *p;
2101         char __user *s = buffer;
2102
2103         if (!data || !table->maxlen || !*lenp ||
2104             (*ppos && !write)) {
2105                 *lenp = 0;
2106                 return 0;
2107         }
2108
2109         i = (unsigned long *) data;
2110         min = (unsigned long *) table->extra1;
2111         max = (unsigned long *) table->extra2;
2112         vleft = table->maxlen / sizeof(unsigned long);
2113         left = *lenp;
2114
2115         for (; left && vleft--; i++, min++, max++, first=0) {
2116                 if (write) {
2117                         while (left) {
2118                                 char c;
2119                                 if (get_user(c, s))
2120                                         return -EFAULT;
2121                                 if (!isspace(c))
2122                                         break;
2123                                 left--;
2124                                 s++;
2125                         }
2126                         if (!left)
2127                                 break;
2128                         neg = 0;
2129                         len = left;
2130                         if (len > TMPBUFLEN-1)
2131                                 len = TMPBUFLEN-1;
2132                         if (copy_from_user(buf, s, len))
2133                                 return -EFAULT;
2134                         buf[len] = 0;
2135                         p = buf;
2136                         if (*p == '-' && left > 1) {
2137                                 neg = 1;
2138                                 p++;
2139                         }
2140                         if (*p < '0' || *p > '9')
2141                                 break;
2142                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2143                         len = p-buf;
2144                         if ((len < left) && *p && !isspace(*p))
2145                                 break;
2146                         if (neg)
2147                                 val = -val;
2148                         s += len;
2149                         left -= len;
2150
2151                         if(neg)
2152                                 continue;
2153                         if ((min && val < *min) || (max && val > *max))
2154                                 continue;
2155                         *i = val;
2156                 } else {
2157                         p = buf;
2158                         if (!first)
2159                                 *p++ = '\t';
2160                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2161                         len = strlen(buf);
2162                         if (len > left)
2163                                 len = left;
2164                         if(copy_to_user(s, buf, len))
2165                                 return -EFAULT;
2166                         left -= len;
2167                         s += len;
2168                 }
2169         }
2170
2171         if (!write && !first && left) {
2172                 if(put_user('\n', s))
2173                         return -EFAULT;
2174                 left--, s++;
2175         }
2176         if (write) {
2177                 while (left) {
2178                         char c;
2179                         if (get_user(c, s++))
2180                                 return -EFAULT;
2181                         if (!isspace(c))
2182                                 break;
2183                         left--;
2184                 }
2185         }
2186         if (write && first)
2187                 return -EINVAL;
2188         *lenp -= left;
2189         *ppos += *lenp;
2190         return 0;
2191 #undef TMPBUFLEN
2192 }
2193
2194 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
2195                                      struct file *filp,
2196                                      void __user *buffer,
2197                                      size_t *lenp, loff_t *ppos,
2198                                      unsigned long convmul,
2199                                      unsigned long convdiv)
2200 {
2201         return __do_proc_doulongvec_minmax(table->data, table, write,
2202                         filp, buffer, lenp, ppos, convmul, convdiv);
2203 }
2204
2205 /**
2206  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2207  * @table: the sysctl table
2208  * @write: %TRUE if this is a write to the sysctl file
2209  * @filp: the file structure
2210  * @buffer: the user buffer
2211  * @lenp: the size of the user buffer
2212  * @ppos: file position
2213  *
2214  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2215  * values from/to the user buffer, treated as an ASCII string.
2216  *
2217  * This routine will ensure the values are within the range specified by
2218  * table->extra1 (min) and table->extra2 (max).
2219  *
2220  * Returns 0 on success.
2221  */
2222 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2223                            void __user *buffer, size_t *lenp, loff_t *ppos)
2224 {
2225     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2226 }
2227
2228 /**
2229  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2230  * @table: the sysctl table
2231  * @write: %TRUE if this is a write to the sysctl file
2232  * @filp: the file structure
2233  * @buffer: the user buffer
2234  * @lenp: the size of the user buffer
2235  * @ppos: file position
2236  *
2237  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2238  * values from/to the user buffer, treated as an ASCII string. The values
2239  * are treated as milliseconds, and converted to jiffies when they are stored.
2240  *
2241  * This routine will ensure the values are within the range specified by
2242  * table->extra1 (min) and table->extra2 (max).
2243  *
2244  * Returns 0 on success.
2245  */
2246 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2247                                       struct file *filp,
2248                                       void __user *buffer,
2249                                       size_t *lenp, loff_t *ppos)
2250 {
2251     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2252                                      lenp, ppos, HZ, 1000l);
2253 }
2254
2255
2256 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2257                                          int *valp,
2258                                          int write, void *data)
2259 {
2260         if (write) {
2261                 if (*lvalp > LONG_MAX / HZ)
2262                         return 1;
2263                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2264         } else {
2265                 int val = *valp;
2266                 unsigned long lval;
2267                 if (val < 0) {
2268                         *negp = -1;
2269                         lval = (unsigned long)-val;
2270                 } else {
2271                         *negp = 0;
2272                         lval = (unsigned long)val;
2273                 }
2274                 *lvalp = lval / HZ;
2275         }
2276         return 0;
2277 }
2278
2279 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2280                                                 int *valp,
2281                                                 int write, void *data)
2282 {
2283         if (write) {
2284                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2285                         return 1;
2286                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2287         } else {
2288                 int val = *valp;
2289                 unsigned long lval;
2290                 if (val < 0) {
2291                         *negp = -1;
2292                         lval = (unsigned long)-val;
2293                 } else {
2294                         *negp = 0;
2295                         lval = (unsigned long)val;
2296                 }
2297                 *lvalp = jiffies_to_clock_t(lval);
2298         }
2299         return 0;
2300 }
2301
2302 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2303                                             int *valp,
2304                                             int write, void *data)
2305 {
2306         if (write) {
2307                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2308         } else {
2309                 int val = *valp;
2310                 unsigned long lval;
2311                 if (val < 0) {
2312                         *negp = -1;
2313                         lval = (unsigned long)-val;
2314                 } else {
2315                         *negp = 0;
2316                         lval = (unsigned long)val;
2317                 }
2318                 *lvalp = jiffies_to_msecs(lval);
2319         }
2320         return 0;
2321 }
2322
2323 /**
2324  * proc_dointvec_jiffies - read a vector of integers as seconds
2325  * @table: the sysctl table
2326  * @write: %TRUE if this is a write to the sysctl file
2327  * @filp: the file structure
2328  * @buffer: the user buffer
2329  * @lenp: the size of the user buffer
2330  * @ppos: file position
2331  *
2332  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2333  * values from/to the user buffer, treated as an ASCII string.
2334  * The values read are assumed to be in seconds, and are converted into
2335  * jiffies.
2336  *
2337  * Returns 0 on success.
2338  */
2339 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2340                           void __user *buffer, size_t *lenp, loff_t *ppos)
2341 {
2342     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2343                             do_proc_dointvec_jiffies_conv,NULL);
2344 }
2345
2346 /**
2347  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2348  * @table: the sysctl table
2349  * @write: %TRUE if this is a write to the sysctl file
2350  * @filp: the file structure
2351  * @buffer: the user buffer
2352  * @lenp: the size of the user buffer
2353  * @ppos: pointer to the file position
2354  *
2355  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2356  * values from/to the user buffer, treated as an ASCII string.
2357  * The values read are assumed to be in 1/USER_HZ seconds, and
2358  * are converted into jiffies.
2359  *
2360  * Returns 0 on success.
2361  */
2362 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2363                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2364 {
2365     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2366                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2367 }
2368
2369 /**
2370  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2371  * @table: the sysctl table
2372  * @write: %TRUE if this is a write to the sysctl file
2373  * @filp: the file structure
2374  * @buffer: the user buffer
2375  * @lenp: the size of the user buffer
2376  * @ppos: file position
2377  * @ppos: the current position in the file
2378  *
2379  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2380  * values from/to the user buffer, treated as an ASCII string.
2381  * The values read are assumed to be in 1/1000 seconds, and
2382  * are converted into jiffies.
2383  *
2384  * Returns 0 on success.
2385  */
2386 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2387                              void __user *buffer, size_t *lenp, loff_t *ppos)
2388 {
2389         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2390                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2391 }
2392
2393 #ifdef CONFIG_SYSVIPC
2394 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2395                 void __user *buffer, size_t *lenp, loff_t *ppos)
2396 {
2397         void *data;
2398         struct ipc_namespace *ns;
2399
2400         ns = current->nsproxy->ipc_ns;
2401
2402         switch (table->ctl_name) {
2403         case KERN_SHMMAX:
2404                 data = &ns->shm_ctlmax;
2405                 goto proc_minmax;
2406         case KERN_SHMALL:
2407                 data = &ns->shm_ctlall;
2408                 goto proc_minmax;
2409         case KERN_SHMMNI:
2410                 data = &ns->shm_ctlmni;
2411                 break;
2412         case KERN_MSGMAX:
2413                 data = &ns->msg_ctlmax;
2414                 break;
2415         case KERN_MSGMNI:
2416                 data = &ns->msg_ctlmni;
2417                 break;
2418         case KERN_MSGMNB:
2419                 data = &ns->msg_ctlmnb;
2420                 break;
2421         case KERN_SEM:
2422                 data = &ns->sem_ctls;
2423                 break;
2424         default:
2425                 return -EINVAL;
2426         }
2427
2428         return __do_proc_dointvec(data, table, write, filp, buffer,
2429                         lenp, ppos, NULL, NULL);
2430 proc_minmax:
2431         return __do_proc_doulongvec_minmax(data, table, write, filp, buffer,
2432                         lenp, ppos, 1l, 1l);
2433 }
2434 #endif
2435
2436 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
2437                            void __user *buffer, size_t *lenp, loff_t *ppos)
2438 {
2439         struct pid *new_pid;
2440         pid_t tmp;
2441         int r;
2442
2443         tmp = pid_nr(cad_pid);
2444
2445         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2446                                lenp, ppos, NULL, NULL);
2447         if (r || !write)
2448                 return r;
2449
2450         new_pid = find_get_pid(tmp);
2451         if (!new_pid)
2452                 return -ESRCH;
2453
2454         put_pid(xchg(&cad_pid, new_pid));
2455         return 0;
2456 }
2457
2458 #else /* CONFIG_PROC_FS */
2459
2460 int proc_dostring(ctl_table *table, int write, struct file *filp,
2461                   void __user *buffer, size_t *lenp, loff_t *ppos)
2462 {
2463         return -ENOSYS;
2464 }
2465
2466 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
2467                 void __user *buffer, size_t *lenp, loff_t *ppos)
2468 {
2469         return -ENOSYS;
2470 }
2471
2472 #ifdef CONFIG_SYSVIPC
2473 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2474                 void __user *buffer, size_t *lenp, loff_t *ppos)
2475 {
2476         return -ENOSYS;
2477 }
2478 #endif
2479
2480 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2481                   void __user *buffer, size_t *lenp, loff_t *ppos)
2482 {
2483         return -ENOSYS;
2484 }
2485
2486 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2487                         void __user *buffer, size_t *lenp, loff_t *ppos)
2488 {
2489         return -ENOSYS;
2490 }
2491
2492 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2493                     void __user *buffer, size_t *lenp, loff_t *ppos)
2494 {
2495         return -ENOSYS;
2496 }
2497
2498 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2499                     void __user *buffer, size_t *lenp, loff_t *ppos)
2500 {
2501         return -ENOSYS;
2502 }
2503
2504 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2505                     void __user *buffer, size_t *lenp, loff_t *ppos)
2506 {
2507         return -ENOSYS;
2508 }
2509
2510 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2511                              void __user *buffer, size_t *lenp, loff_t *ppos)
2512 {
2513         return -ENOSYS;
2514 }
2515
2516 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2517                     void __user *buffer, size_t *lenp, loff_t *ppos)
2518 {
2519         return -ENOSYS;
2520 }
2521
2522 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2523                                       struct file *filp,
2524                                       void __user *buffer,
2525                                       size_t *lenp, loff_t *ppos)
2526 {
2527     return -ENOSYS;
2528 }
2529
2530
2531 #endif /* CONFIG_PROC_FS */
2532
2533
2534 #ifdef CONFIG_SYSCTL_SYSCALL
2535 /*
2536  * General sysctl support routines
2537  */
2538
2539 /* The generic string strategy routine: */
2540 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2541                   void __user *oldval, size_t __user *oldlenp,
2542                   void __user *newval, size_t newlen, void **context)
2543 {
2544         if (!table->data || !table->maxlen)
2545                 return -ENOTDIR;
2546
2547         if (oldval && oldlenp) {
2548                 size_t bufsize;
2549                 if (get_user(bufsize, oldlenp))
2550                         return -EFAULT;
2551                 if (bufsize) {
2552                         size_t len = strlen(table->data), copied;
2553
2554                         /* This shouldn't trigger for a well-formed sysctl */
2555                         if (len > table->maxlen)
2556                                 len = table->maxlen;
2557
2558                         /* Copy up to a max of bufsize-1 bytes of the string */
2559                         copied = (len >= bufsize) ? bufsize - 1 : len;
2560
2561                         if (copy_to_user(oldval, table->data, copied) ||
2562                             put_user(0, (char __user *)(oldval + copied)))
2563                                 return -EFAULT;
2564                         if (put_user(len, oldlenp))
2565                                 return -EFAULT;
2566                 }
2567         }
2568         if (newval && newlen) {
2569                 size_t len = newlen;
2570                 if (len > table->maxlen)
2571                         len = table->maxlen;
2572                 if(copy_from_user(table->data, newval, len))
2573                         return -EFAULT;
2574                 if (len == table->maxlen)
2575                         len--;
2576                 ((char *) table->data)[len] = 0;
2577         }
2578         return 1;
2579 }
2580
2581 /*
2582  * This function makes sure that all of the integers in the vector
2583  * are between the minimum and maximum values given in the arrays
2584  * table->extra1 and table->extra2, respectively.
2585  */
2586 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2587                 void __user *oldval, size_t __user *oldlenp,
2588                 void __user *newval, size_t newlen, void **context)
2589 {
2590
2591         if (newval && newlen) {
2592                 int __user *vec = (int __user *) newval;
2593                 int *min = (int *) table->extra1;
2594                 int *max = (int *) table->extra2;
2595                 size_t length;
2596                 int i;
2597
2598                 if (newlen % sizeof(int) != 0)
2599                         return -EINVAL;
2600
2601                 if (!table->extra1 && !table->extra2)
2602                         return 0;
2603
2604                 if (newlen > table->maxlen)
2605                         newlen = table->maxlen;
2606                 length = newlen / sizeof(int);
2607
2608                 for (i = 0; i < length; i++) {
2609                         int value;
2610                         if (get_user(value, vec + i))
2611                                 return -EFAULT;
2612                         if (min && value < min[i])
2613                                 return -EINVAL;
2614                         if (max && value > max[i])
2615                                 return -EINVAL;
2616                 }
2617         }
2618         return 0;
2619 }
2620
2621 /* Strategy function to convert jiffies to seconds */
2622 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2623                 void __user *oldval, size_t __user *oldlenp,
2624                 void __user *newval, size_t newlen, void **context)
2625 {
2626         if (oldval) {
2627                 size_t olen;
2628                 if (oldlenp) {
2629                         if (get_user(olen, oldlenp))
2630                                 return -EFAULT;
2631                         if (olen!=sizeof(int))
2632                                 return -EINVAL;
2633                 }
2634                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2635                     (oldlenp && put_user(sizeof(int),oldlenp)))
2636                         return -EFAULT;
2637         }
2638         if (newval && newlen) {
2639                 int new;
2640                 if (newlen != sizeof(int))
2641                         return -EINVAL;
2642                 if (get_user(new, (int __user *)newval))
2643                         return -EFAULT;
2644                 *(int *)(table->data) = new*HZ;
2645         }
2646         return 1;
2647 }
2648
2649 /* Strategy function to convert jiffies to seconds */
2650 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2651                 void __user *oldval, size_t __user *oldlenp,
2652                 void __user *newval, size_t newlen, void **context)
2653 {
2654         if (oldval) {
2655                 size_t olen;
2656                 if (oldlenp) {
2657                         if (get_user(olen, oldlenp))
2658                                 return -EFAULT;
2659                         if (olen!=sizeof(int))
2660                                 return -EINVAL;
2661                 }
2662                 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2663                     (oldlenp && put_user(sizeof(int),oldlenp)))
2664                         return -EFAULT;
2665         }
2666         if (newval && newlen) {
2667                 int new;
2668                 if (newlen != sizeof(int))
2669                         return -EINVAL;
2670                 if (get_user(new, (int __user *)newval))
2671                         return -EFAULT;
2672                 *(int *)(table->data) = msecs_to_jiffies(new);
2673         }
2674         return 1;
2675 }
2676
2677 #else /* CONFIG_SYSCTL_SYSCALL */
2678
2679
2680 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2681 {
2682         static int msg_count;
2683         struct __sysctl_args tmp;
2684         int name[CTL_MAXNAME];
2685         int i;
2686
2687         /* Read in the sysctl name for better debug message logging */
2688         if (copy_from_user(&tmp, args, sizeof(tmp)))
2689                 return -EFAULT;
2690         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2691                 return -ENOTDIR;
2692         for (i = 0; i < tmp.nlen; i++)
2693                 if (get_user(name[i], tmp.name + i))
2694                         return -EFAULT;
2695
2696         /* Ignore accesses to kernel.version */
2697         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2698                 goto out;
2699
2700         if (msg_count < 5) {
2701                 msg_count++;
2702                 printk(KERN_INFO
2703                         "warning: process `%s' used the removed sysctl "
2704                         "system call with ", current->comm);
2705                 for (i = 0; i < tmp.nlen; i++)
2706                         printk("%d.", name[i]);
2707                 printk("\n");
2708         }
2709 out:
2710         return -ENOSYS;
2711 }
2712
2713 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2714                   void __user *oldval, size_t __user *oldlenp,
2715                   void __user *newval, size_t newlen, void **context)
2716 {
2717         return -ENOSYS;
2718 }
2719
2720 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2721                 void __user *oldval, size_t __user *oldlenp,
2722                 void __user *newval, size_t newlen, void **context)
2723 {
2724         return -ENOSYS;
2725 }
2726
2727 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2728                 void __user *oldval, size_t __user *oldlenp,
2729                 void __user *newval, size_t newlen, void **context)
2730 {
2731         return -ENOSYS;
2732 }
2733
2734 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2735                 void __user *oldval, size_t __user *oldlenp,
2736                 void __user *newval, size_t newlen, void **context)
2737 {
2738         return -ENOSYS;
2739 }
2740
2741 #endif /* CONFIG_SYSCTL_SYSCALL */
2742
2743 /*
2744  * No sense putting this after each symbol definition, twice,
2745  * exception granted :-)
2746  */
2747 EXPORT_SYMBOL(proc_dointvec);
2748 EXPORT_SYMBOL(proc_dointvec_jiffies);
2749 EXPORT_SYMBOL(proc_dointvec_minmax);
2750 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2751 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2752 EXPORT_SYMBOL(proc_dostring);
2753 EXPORT_SYMBOL(proc_doulongvec_minmax);
2754 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2755 EXPORT_SYMBOL(register_sysctl_table);
2756 EXPORT_SYMBOL(sysctl_intvec);
2757 EXPORT_SYMBOL(sysctl_jiffies);
2758 EXPORT_SYMBOL(sysctl_ms_jiffies);
2759 EXPORT_SYMBOL(sysctl_string);
2760 EXPORT_SYMBOL(unregister_sysctl_table);