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/config.h>
  22 #include <linux/module.h>
  23 #include <linux/mm.h>
  24 #include <linux/swap.h>
  25 #include <linux/slab.h>
  26 #include <linux/sysctl.h>
  27 #include <linux/proc_fs.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/sysrq.h>
  35 #include <linux/highuid.h>
  36 #include <linux/writeback.h>
  37 #include <linux/hugetlb.h>
  38 #include <linux/security.h>
  39 #include <linux/initrd.h>
  40 #include <linux/times.h>
  41 #include <linux/limits.h>
  42 #include <linux/dcache.h>
  43 #include <linux/syscalls.h>
  44 #include <linux/vserver/cvirt.h>
  45
  46 #include <asm/uaccess.h>
  47 #include <asm/processor.h>
  48
  49 #ifdef CONFIG_ROOT_NFS
  50 #include <linux/nfs_fs.h>
  51 #endif
  52
  53 #if defined(CONFIG_SYSCTL)
  54
  55 /* External variables not in a header file. */
  56 extern int C_A_D;
  57 extern int sysctl_overcommit_memory;
  58 extern int sysctl_overcommit_ratio;
  59 extern int max_threads;
  60 extern int sysrq_enabled;
  61 extern int core_uses_pid;
  62 extern char core_pattern[];
  63 extern int cad_pid;
  64 extern int pid_max;
  65 extern int min_free_kbytes;
  66 extern int printk_ratelimit_jiffies;
  67 extern int printk_ratelimit_burst;
  68 extern int pid_max_min, pid_max_max;
  69
  70 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
  71 int unknown_nmi_panic;
  72 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
  73                                   void __user *, size_t *, loff_t *);
  74 #endif
  75
  76 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
  77 static int maxolduid = 65535;
  78 static int minolduid;
  79
  80 static int ngroups_max = NGROUPS_MAX;
  81
  82 #ifdef CONFIG_KMOD
  83 extern char modprobe_path[];
  84 #endif
  85 #ifdef CONFIG_HOTPLUG
  86 extern char hotplug_path[];
  87 #endif
  88 extern char vshelper_path[];
  89 #ifdef CONFIG_CHR_DEV_SG
  90 extern int sg_big_buff;
  91 #endif
  92 #ifdef CONFIG_SYSVIPC
  93 extern size_t shm_ctlmax;
  94 extern size_t shm_ctlall;
  95 extern int shm_ctlmni;
  96 extern int msg_ctlmax;
  97 extern int msg_ctlmnb;
  98 extern int msg_ctlmni;
  99 extern int sem_ctls[];
 100 #endif
 101
 102 #ifdef __sparc__
 103 extern char reboot_command [];
 104 extern int stop_a_enabled;
 105 extern int scons_pwroff;
 106 #endif
 107
 108 #ifdef __hppa__
 109 extern int pwrsw_enabled;
 110 extern int unaligned_enabled;
 111 #endif
 112
 113 #ifdef CONFIG_ARCH_S390
 114 #ifdef CONFIG_MATHEMU
 115 extern int sysctl_ieee_emulation_warnings;
 116 #endif
 117 extern int sysctl_userprocess_debug;
 118 #endif
 119
 120 extern int sysctl_hz_timer;
 121
 122 #ifdef CONFIG_BSD_PROCESS_ACCT
 123 extern int acct_parm[];
 124 #endif
 125
 126 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
 127                        ctl_table *, void **);
 128 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
 129                   void __user *buffer, size_t *lenp, loff_t *ppos);
 130
 131 static ctl_table root_table[];
 132 static struct ctl_table_header root_table_header =
 133         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 134
 135 static ctl_table kern_table[];
 136 static ctl_table vm_table[];
 137 #ifdef CONFIG_NET
 138 extern ctl_table net_table[];
 139 #endif
 140 static ctl_table proc_table[];
 141 static ctl_table fs_table[];
 142 static ctl_table debug_table[];
 143 static ctl_table dev_table[];
 144 extern ctl_table random_table[];
 145 #ifdef CONFIG_UNIX98_PTYS
 146 extern ctl_table pty_table[];
 147 #endif
 148
 149 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 150 int sysctl_legacy_va_layout;
 151 #endif
 152
 153 /* /proc declarations: */
 154
 155 #ifdef CONFIG_PROC_FS
 156
 157 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
 158 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
 159 static int proc_opensys(struct inode *, struct file *);
 160
 161 struct file_operations proc_sys_file_operations = {
 162         .open           = proc_opensys,
 163         .read           = proc_readsys,
 164         .write          = proc_writesys,
 165 };
 166
 167 extern struct proc_dir_entry *proc_sys_root;
 168
 169 static void register_proc_table(ctl_table *, struct proc_dir_entry *);
 170 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
 171 #endif
 172
 173 /* The default sysctl tables: */
 174
 175 static ctl_table root_table[] = {
 176         {
 177                 .ctl_name       = CTL_KERN,
 178                 .procname       = "kernel",
 179                 .mode           = 0555,
 180                 .child          = kern_table,
 181         },
 182         {
 183                 .ctl_name       = CTL_VM,
 184                 .procname       = "vm",
 185                 .mode           = 0555,
 186                 .child          = vm_table,
 187         },
 188 #ifdef CONFIG_NET
 189         {
 190                 .ctl_name       = CTL_NET,
 191                 .procname       = "net",
 192                 .mode           = 0555,
 193                 .child          = net_table,
 194         },
 195 #endif
 196         {
 197                 .ctl_name       = CTL_PROC,
 198                 .procname       = "proc",
 199                 .mode           = 0555,
 200                 .child          = proc_table,
 201         },
 202         {
 203                 .ctl_name       = CTL_FS,
 204                 .procname       = "fs",
 205                 .mode           = 0555,
 206                 .child          = fs_table,
 207         },
 208         {
 209                 .ctl_name       = CTL_DEBUG,
 210                 .procname       = "debug",
 211                 .mode           = 0555,
 212                 .child          = debug_table,
 213         },
 214         {
 215                 .ctl_name       = CTL_DEV,
 216                 .procname       = "dev",
 217                 .mode           = 0555,
 218                 .child          = dev_table,
 219         },
 220         { .ctl_name = 0 }
 221 };
 222
 223 static ctl_table kern_table[] = {
 224         {
 225                 .ctl_name       = KERN_OSTYPE,
 226                 .procname       = "ostype",
 227                 .data           = system_utsname.sysname,
 228                 .maxlen         = sizeof(system_utsname.sysname),
 229                 .mode           = 0444,
 230                 .proc_handler   = &proc_doutsstring,
 231                 .virt_handler   = &vx_uts_virt_handler,
 232                 .strategy       = &sysctl_string,
 233         },
 234         {
 235                 .ctl_name       = KERN_OSRELEASE,
 236                 .procname       = "osrelease",
 237                 .data           = system_utsname.release,
 238                 .maxlen         = sizeof(system_utsname.release),
 239                 .mode           = 0444,
 240                 .proc_handler   = &proc_doutsstring,
 241                 .virt_handler   = &vx_uts_virt_handler,
 242                 .strategy       = &sysctl_string,
 243         },
 244         {
 245                 .ctl_name       = KERN_VERSION,
 246                 .procname       = "version",
 247                 .data           = system_utsname.version,
 248                 .maxlen         = sizeof(system_utsname.version),
 249                 .mode           = 0444,
 250                 .proc_handler   = &proc_doutsstring,
 251                 .virt_handler   = &vx_uts_virt_handler,
 252                 .strategy       = &sysctl_string,
 253         },
 254         {
 255                 .ctl_name       = KERN_NODENAME,
 256                 .procname       = "hostname",
 257                 .data           = system_utsname.nodename,
 258                 .maxlen         = sizeof(system_utsname.nodename),
 259                 .mode           = 0644,
 260                 .proc_handler   = &proc_doutsstring,
 261                 .virt_handler   = &vx_uts_virt_handler,
 262                 .strategy       = &sysctl_string,
 263         },
 264         {
 265                 .ctl_name       = KERN_DOMAINNAME,
 266                 .procname       = "domainname",
 267                 .data           = system_utsname.domainname,
 268                 .maxlen         = sizeof(system_utsname.domainname),
 269                 .mode           = 0644,
 270                 .proc_handler   = &proc_doutsstring,
 271                 .virt_handler   = &vx_uts_virt_handler,
 272                 .strategy       = &sysctl_string,
 273         },
 274         {
 275                 .ctl_name       = KERN_PANIC,
 276                 .procname       = "panic",
 277                 .data           = &panic_timeout,
 278                 .maxlen         = sizeof(int),
 279                 .mode           = 0644,
 280                 .proc_handler   = &proc_dointvec,
 281         },
 282         {
 283                 .ctl_name       = KERN_CORE_USES_PID,
 284                 .procname       = "core_uses_pid",
 285                 .data           = &core_uses_pid,
 286                 .maxlen         = sizeof(int),
 287                 .mode           = 0644,
 288                 .proc_handler   = &proc_dointvec,
 289         },
 290         {
 291                 .ctl_name       = KERN_CORE_PATTERN,
 292                 .procname       = "core_pattern",
 293                 .data           = core_pattern,
 294                 .maxlen         = 64,
 295                 .mode           = 0644,
 296                 .proc_handler   = &proc_dostring,
 297                 .strategy       = &sysctl_string,
 298         },
 299         {
 300                 .ctl_name       = KERN_TAINTED,
 301                 .procname       = "tainted",
 302                 .data           = &tainted,
 303                 .maxlen         = sizeof(int),
 304                 .mode           = 0444,
 305                 .proc_handler   = &proc_dointvec,
 306         },
 307         {
 308                 .ctl_name       = KERN_CAP_BSET,
 309                 .procname       = "cap-bound",
 310                 .data           = &cap_bset,
 311                 .maxlen         = sizeof(kernel_cap_t),
 312                 .mode           = 0600,
 313                 .proc_handler   = &proc_dointvec_bset,
 314         },
 315 #ifdef CONFIG_BLK_DEV_INITRD
 316         {
 317                 .ctl_name       = KERN_REALROOTDEV,
 318                 .procname       = "real-root-dev",
 319                 .data           = &real_root_dev,
 320                 .maxlen         = sizeof(int),
 321                 .mode           = 0644,
 322                 .proc_handler   = &proc_dointvec,
 323         },
 324 #endif
 325 #ifdef __sparc__
 326         {
 327                 .ctl_name       = KERN_SPARC_REBOOT,
 328                 .procname       = "reboot-cmd",
 329                 .data           = reboot_command,
 330                 .maxlen         = 256,
 331                 .mode           = 0644,
 332                 .proc_handler   = &proc_dostring,
 333                 .strategy       = &sysctl_string,
 334         },
 335         {
 336                 .ctl_name       = KERN_SPARC_STOP_A,
 337                 .procname       = "stop-a",
 338                 .data           = &stop_a_enabled,
 339                 .maxlen         = sizeof (int),
 340                 .mode           = 0644,
 341                 .proc_handler   = &proc_dointvec,
 342         },
 343         {
 344                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 345                 .procname       = "scons-poweroff",
 346                 .data           = &scons_pwroff,
 347                 .maxlen         = sizeof (int),
 348                 .mode           = 0644,
 349                 .proc_handler   = &proc_dointvec,
 350         },
 351 #endif
 352 #ifdef __hppa__
 353         {
 354                 .ctl_name       = KERN_HPPA_PWRSW,
 355                 .procname       = "soft-power",
 356                 .data           = &pwrsw_enabled,
 357                 .maxlen         = sizeof (int),
 358                 .mode           = 0644,
 359                 .proc_handler   = &proc_dointvec,
 360         },
 361         {
 362                 .ctl_name       = KERN_HPPA_UNALIGNED,
 363                 .procname       = "unaligned-trap",
 364                 .data           = &unaligned_enabled,
 365                 .maxlen         = sizeof (int),
 366                 .mode           = 0644,
 367                 .proc_handler   = &proc_dointvec,
 368         },
 369 #endif
 370         {
 371                 .ctl_name       = KERN_CTLALTDEL,
 372                 .procname       = "ctrl-alt-del",
 373                 .data           = &C_A_D,
 374                 .maxlen         = sizeof(int),
 375                 .mode           = 0644,
 376                 .proc_handler   = &proc_dointvec,
 377         },
 378         {
 379                 .ctl_name       = KERN_PRINTK,
 380                 .procname       = "printk",
 381                 .data           = &console_loglevel,
 382                 .maxlen         = 4*sizeof(int),
 383                 .mode           = 0644,
 384                 .proc_handler   = &proc_dointvec,
 385         },
 386 #ifdef CONFIG_KMOD
 387         {
 388                 .ctl_name       = KERN_MODPROBE,
 389                 .procname       = "modprobe",
 390                 .data           = &modprobe_path,
 391                 .maxlen         = KMOD_PATH_LEN,
 392                 .mode           = 0644,
 393                 .proc_handler   = &proc_dostring,
 394                 .strategy       = &sysctl_string,
 395         },
 396 #endif
 397 #ifdef CONFIG_HOTPLUG
 398         {
 399                 .ctl_name       = KERN_HOTPLUG,
 400                 .procname       = "hotplug",
 401                 .data           = &hotplug_path,
 402                 .maxlen         = HOTPLUG_PATH_LEN,
 403                 .mode           = 0644,
 404                 .proc_handler   = &proc_dostring,
 405                 .strategy       = &sysctl_string,
 406         },
 407 #endif
 408         {
 409                 .ctl_name       = KERN_VSHELPER,
 410                 .procname       = "vshelper",
 411                 .data           = &vshelper_path,
 412                 .maxlen         = 256,
 413                 .mode           = 0644,
 414                 .proc_handler   = &proc_dostring,
 415                 .strategy       = &sysctl_string,
 416         },
 417 #ifdef CONFIG_CHR_DEV_SG
 418         {
 419                 .ctl_name       = KERN_SG_BIG_BUFF,
 420                 .procname       = "sg-big-buff",
 421                 .data           = &sg_big_buff,
 422                 .maxlen         = sizeof (int),
 423                 .mode           = 0444,
 424                 .proc_handler   = &proc_dointvec,
 425         },
 426 #endif
 427 #ifdef CONFIG_BSD_PROCESS_ACCT
 428         {
 429                 .ctl_name       = KERN_ACCT,
 430                 .procname       = "acct",
 431                 .data           = &acct_parm,
 432                 .maxlen         = 3*sizeof(int),
 433                 .mode           = 0644,
 434                 .proc_handler   = &proc_dointvec,
 435         },
 436 #endif
 437 #ifdef CONFIG_SYSVIPC
 438         {
 439                 .ctl_name       = KERN_SHMMAX,
 440                 .procname       = "shmmax",
 441                 .data           = &shm_ctlmax,
 442                 .maxlen         = sizeof (size_t),
 443                 .mode           = 0644,
 444                 .proc_handler   = &proc_doulongvec_minmax,
 445         },
 446         {
 447                 .ctl_name       = KERN_SHMALL,
 448                 .procname       = "shmall",
 449                 .data           = &shm_ctlall,
 450                 .maxlen         = sizeof (size_t),
 451                 .mode           = 0644,
 452                 .proc_handler   = &proc_doulongvec_minmax,
 453         },
 454         {
 455                 .ctl_name       = KERN_SHMMNI,
 456                 .procname       = "shmmni",
 457                 .data           = &shm_ctlmni,
 458                 .maxlen         = sizeof (int),
 459                 .mode           = 0644,
 460                 .proc_handler   = &proc_dointvec,
 461         },
 462         {
 463                 .ctl_name       = KERN_MSGMAX,
 464                 .procname       = "msgmax",
 465                 .data           = &msg_ctlmax,
 466                 .maxlen         = sizeof (int),
 467                 .mode           = 0644,
 468                 .proc_handler   = &proc_dointvec,
 469         },
 470         {
 471                 .ctl_name       = KERN_MSGMNI,
 472                 .procname       = "msgmni",
 473                 .data           = &msg_ctlmni,
 474                 .maxlen         = sizeof (int),
 475                 .mode           = 0644,
 476                 .proc_handler   = &proc_dointvec,
 477         },
 478         {
 479                 .ctl_name       = KERN_MSGMNB,
 480                 .procname       =  "msgmnb",
 481                 .data           = &msg_ctlmnb,
 482                 .maxlen         = sizeof (int),
 483                 .mode           = 0644,
 484                 .proc_handler   = &proc_dointvec,
 485         },
 486         {
 487                 .ctl_name       = KERN_SEM,
 488                 .procname       = "sem",
 489                 .data           = &sem_ctls,
 490                 .maxlen         = 4*sizeof (int),
 491                 .mode           = 0644,
 492                 .proc_handler   = &proc_dointvec,
 493         },
 494 #endif
 495 #ifdef CONFIG_MAGIC_SYSRQ
 496         {
 497                 .ctl_name       = KERN_SYSRQ,
 498                 .procname       = "sysrq",
 499                 .data           = &sysrq_enabled,
 500                 .maxlen         = sizeof (int),
 501                 .mode           = 0644,
 502                 .proc_handler   = &proc_dointvec,
 503         },
 504 #endif
 505         {
 506                 .ctl_name       = KERN_CADPID,
 507                 .procname       = "cad_pid",
 508                 .data           = &cad_pid,
 509                 .maxlen         = sizeof (int),
 510                 .mode           = 0600,
 511                 .proc_handler   = &proc_dointvec,
 512         },
 513         {
 514                 .ctl_name       = KERN_MAX_THREADS,
 515                 .procname       = "threads-max",
 516                 .data           = &max_threads,
 517                 .maxlen         = sizeof(int),
 518                 .mode           = 0644,
 519                 .proc_handler   = &proc_dointvec,
 520         },
 521         {
 522                 .ctl_name       = KERN_RANDOM,
 523                 .procname       = "random",
 524                 .mode           = 0555,
 525                 .child          = random_table,
 526         },
 527 #ifdef CONFIG_UNIX98_PTYS
 528         {
 529                 .ctl_name       = KERN_PTY,
 530                 .procname       = "pty",
 531                 .mode           = 0555,
 532                 .child          = pty_table,
 533         },
 534 #endif
 535         {
 536                 .ctl_name       = KERN_OVERFLOWUID,
 537                 .procname       = "overflowuid",
 538                 .data           = &overflowuid,
 539                 .maxlen         = sizeof(int),
 540                 .mode           = 0644,
 541                 .proc_handler   = &proc_dointvec_minmax,
 542                 .strategy       = &sysctl_intvec,
 543                 .extra1         = &minolduid,
 544                 .extra2         = &maxolduid,
 545         },
 546         {
 547                 .ctl_name       = KERN_OVERFLOWGID,
 548                 .procname       = "overflowgid",
 549                 .data           = &overflowgid,
 550                 .maxlen         = sizeof(int),
 551                 .mode           = 0644,
 552                 .proc_handler   = &proc_dointvec_minmax,
 553                 .strategy       = &sysctl_intvec,
 554                 .extra1         = &minolduid,
 555                 .extra2         = &maxolduid,
 556         },
 557 #ifdef CONFIG_ARCH_S390
 558 #ifdef CONFIG_MATHEMU
 559         {
 560                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 561                 .procname       = "ieee_emulation_warnings",
 562                 .data           = &sysctl_ieee_emulation_warnings,
 563                 .maxlen         = sizeof(int),
 564                 .mode           = 0644,
 565                 .proc_handler   = &proc_dointvec,
 566         },
 567 #endif
 568 #ifdef CONFIG_NO_IDLE_HZ
 569         {
 570                 .ctl_name       = KERN_HZ_TIMER,
 571                 .procname       = "hz_timer",
 572                 .data           = &sysctl_hz_timer,
 573                 .maxlen         = sizeof(int),
 574                 .mode           = 0644,
 575                 .proc_handler   = &proc_dointvec,
 576         },
 577 #endif
 578         {
 579                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 580                 .procname       = "userprocess_debug",
 581                 .data           = &sysctl_userprocess_debug,
 582                 .maxlen         = sizeof(int),
 583                 .mode           = 0644,
 584                 .proc_handler   = &proc_dointvec,
 585         },
 586 #endif
 587         {
 588                 .ctl_name       = KERN_PIDMAX,
 589                 .procname       = "pid_max",
 590                 .data           = &pid_max,
 591                 .maxlen         = sizeof (int),
 592                 .mode           = 0644,
 593                 .proc_handler   = &proc_dointvec_minmax,
 594                 .strategy       = sysctl_intvec,
 595                 .extra1         = &pid_max_min,
 596                 .extra2         = &pid_max_max,
 597         },
 598         {
 599                 .ctl_name       = KERN_PANIC_ON_OOPS,
 600                 .procname       = "panic_on_oops",
 601                 .data           = &panic_on_oops,
 602                 .maxlen         = sizeof(int),
 603                 .mode           = 0644,
 604                 .proc_handler   = &proc_dointvec,
 605         },
 606         {
 607                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 608                 .procname       = "printk_ratelimit",
 609                 .data           = &printk_ratelimit_jiffies,
 610                 .maxlen         = sizeof(int),
 611                 .mode           = 0644,
 612                 .proc_handler   = &proc_dointvec_jiffies,
 613                 .strategy       = &sysctl_jiffies,
 614         },
 615         {
 616                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 617                 .procname       = "printk_ratelimit_burst",
 618                 .data           = &printk_ratelimit_burst,
 619                 .maxlen         = sizeof(int),
 620                 .mode           = 0644,
 621                 .proc_handler   = &proc_dointvec,
 622         },
 623         {
 624                 .ctl_name       = KERN_NGROUPS_MAX,
 625                 .procname       = "ngroups_max",
 626                 .data           = &ngroups_max,
 627                 .maxlen         = sizeof (int),
 628                 .mode           = 0444,
 629                 .proc_handler   = &proc_dointvec,
 630         },
 631 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 632         {
 633                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 634                 .procname       = "unknown_nmi_panic",
 635                 .data           = &unknown_nmi_panic,
 636                 .maxlen         = sizeof (int),
 637                 .mode           = 0644,
 638                 .proc_handler   = &proc_unknown_nmi_panic,
 639         },
 640 #endif
 641 #if defined(CONFIG_X86)
 642         {
 643                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 644                 .procname       = "bootloader_type",
 645                 .data           = &bootloader_type,
 646                 .maxlen         = sizeof (int),
 647                 .mode           = 0444,
 648                 .proc_handler   = &proc_dointvec,
 649         },
 650 #endif
 651         { .ctl_name = 0 }
 652 };
 653
 654 /* Constants for minimum and maximum testing in vm_table.
 655    We use these as one-element integer vectors. */
 656 static int zero;
 657 static int one_hundred = 100;
 658
 659
 660 static ctl_table vm_table[] = {
 661         {
 662                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 663                 .procname       = "overcommit_memory",
 664                 .data           = &sysctl_overcommit_memory,
 665                 .maxlen         = sizeof(sysctl_overcommit_memory),
 666                 .mode           = 0644,
 667                 .proc_handler   = &proc_dointvec,
 668         },
 669         {
 670                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 671                 .procname       = "overcommit_ratio",
 672                 .data           = &sysctl_overcommit_ratio,
 673                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 674                 .mode           = 0644,
 675                 .proc_handler   = &proc_dointvec,
 676         },
 677         {
 678                 .ctl_name       = VM_PAGE_CLUSTER,
 679                 .procname       = "page-cluster",
 680                 .data           = &page_cluster,
 681                 .maxlen         = sizeof(int),
 682                 .mode           = 0644,
 683                 .proc_handler   = &proc_dointvec,
 684         },
 685         {
 686                 .ctl_name       = VM_DIRTY_BACKGROUND,
 687                 .procname       = "dirty_background_ratio",
 688                 .data           = &dirty_background_ratio,
 689                 .maxlen         = sizeof(dirty_background_ratio),
 690                 .mode           = 0644,
 691                 .proc_handler   = &proc_dointvec_minmax,
 692                 .strategy       = &sysctl_intvec,
 693                 .extra1         = &zero,
 694                 .extra2         = &one_hundred,
 695         },
 696         {
 697                 .ctl_name       = VM_DIRTY_RATIO,
 698                 .procname       = "dirty_ratio",
 699                 .data           = &vm_dirty_ratio,
 700                 .maxlen         = sizeof(vm_dirty_ratio),
 701                 .mode           = 0644,
 702                 .proc_handler   = &proc_dointvec_minmax,
 703                 .strategy       = &sysctl_intvec,
 704                 .extra1         = &zero,
 705                 .extra2         = &one_hundred,
 706         },
 707         {
 708                 .ctl_name       = VM_DIRTY_WB_CS,
 709                 .procname       = "dirty_writeback_centisecs",
 710                 .data           = &dirty_writeback_centisecs,
 711                 .maxlen         = sizeof(dirty_writeback_centisecs),
 712                 .mode           = 0644,
 713                 .proc_handler   = &dirty_writeback_centisecs_handler,
 714         },
 715         {
 716                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
 717                 .procname       = "dirty_expire_centisecs",
 718                 .data           = &dirty_expire_centisecs,
 719                 .maxlen         = sizeof(dirty_expire_centisecs),
 720                 .mode           = 0644,
 721                 .proc_handler   = &proc_dointvec,
 722         },
 723         {
 724                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 725                 .procname       = "nr_pdflush_threads",
 726                 .data           = &nr_pdflush_threads,
 727                 .maxlen         = sizeof nr_pdflush_threads,
 728                 .mode           = 0444 /* read-only*/,
 729                 .proc_handler   = &proc_dointvec,
 730         },
 731         {
 732                 .ctl_name       = VM_SWAPPINESS,
 733                 .procname       = "swappiness",
 734                 .data           = &vm_swappiness,
 735                 .maxlen         = sizeof(vm_swappiness),
 736                 .mode           = 0644,
 737                 .proc_handler   = &proc_dointvec_minmax,
 738                 .strategy       = &sysctl_intvec,
 739                 .extra1         = &zero,
 740                 .extra2         = &one_hundred,
 741         },
 742 #ifdef CONFIG_HUGETLB_PAGE
 743          {
 744                 .ctl_name       = VM_HUGETLB_PAGES,
 745                 .procname       = "nr_hugepages",
 746                 .data           = &max_huge_pages,
 747                 .maxlen         = sizeof(unsigned long),
 748                 .mode           = 0644,
 749                 .proc_handler   = &hugetlb_sysctl_handler,
 750                 .extra1         = (void *)&hugetlb_zero,
 751                 .extra2         = (void *)&hugetlb_infinity,
 752          },
 753          {
 754                 .ctl_name       = VM_HUGETLB_GROUP,
 755                 .procname       = "hugetlb_shm_group",
 756                 .data           = &sysctl_hugetlb_shm_group,
 757                 .maxlen         = sizeof(gid_t),
 758                 .mode           = 0644,
 759                 .proc_handler   = &proc_dointvec,
 760          },
 761 #endif
 762         {
 763                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 764                 .procname       = "lowmem_reserve_ratio",
 765                 .data           = &sysctl_lowmem_reserve_ratio,
 766                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 767                 .mode           = 0644,
 768                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 769                 .strategy       = &sysctl_intvec,
 770         },
 771         {
 772                 .ctl_name       = VM_MIN_FREE_KBYTES,
 773                 .procname       = "min_free_kbytes",
 774                 .data           = &min_free_kbytes,
 775                 .maxlen         = sizeof(min_free_kbytes),
 776                 .mode           = 0644,
 777                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 778                 .strategy       = &sysctl_intvec,
 779                 .extra1         = &zero,
 780         },
 781 #ifdef CONFIG_MMU
 782         {
 783                 .ctl_name       = VM_MAX_MAP_COUNT,
 784                 .procname       = "max_map_count",
 785                 .data           = &sysctl_max_map_count,
 786                 .maxlen         = sizeof(sysctl_max_map_count),
 787                 .mode           = 0644,
 788                 .proc_handler   = &proc_dointvec
 789         },
 790 #endif
 791         {
 792                 .ctl_name       = VM_LAPTOP_MODE,
 793                 .procname       = "laptop_mode",
 794                 .data           = &laptop_mode,
 795                 .maxlen         = sizeof(laptop_mode),
 796                 .mode           = 0644,
 797                 .proc_handler   = &proc_dointvec,
 798                 .strategy       = &sysctl_intvec,
 799                 .extra1         = &zero,
 800         },
 801         {
 802                 .ctl_name       = VM_BLOCK_DUMP,
 803                 .procname       = "block_dump",
 804                 .data           = &block_dump,
 805                 .maxlen         = sizeof(block_dump),
 806                 .mode           = 0644,
 807                 .proc_handler   = &proc_dointvec,
 808                 .strategy       = &sysctl_intvec,
 809                 .extra1         = &zero,
 810         },
 811         {
 812                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 813                 .procname       = "vfs_cache_pressure",
 814                 .data           = &sysctl_vfs_cache_pressure,
 815                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 816                 .mode           = 0644,
 817                 .proc_handler   = &proc_dointvec,
 818                 .strategy       = &sysctl_intvec,
 819                 .extra1         = &zero,
 820         },
 821 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 822         {
 823                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 824                 .procname       = "legacy_va_layout",
 825                 .data           = &sysctl_legacy_va_layout,
 826                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 827                 .mode           = 0644,
 828                 .proc_handler   = &proc_dointvec,
 829                 .strategy       = &sysctl_intvec,
 830                 .extra1         = &zero,
 831         },
 832 #endif
 833 #ifdef CONFIG_SWAP
 834         {
 835                 .ctl_name       = VM_SWAP_TOKEN_TIMEOUT,
 836                 .procname       = "swap_token_timeout",
 837                 .data           = &swap_token_default_timeout,
 838                 .maxlen         = sizeof(swap_token_default_timeout),
 839                 .mode           = 0644,
 840                 .proc_handler   = &proc_dointvec_jiffies,
 841                 .strategy       = &sysctl_jiffies,
 842         },
 843 #endif
 844         { .ctl_name = 0 }
 845 };
 846
 847 static ctl_table proc_table[] = {
 848         { .ctl_name = 0 }
 849 };
 850
 851 static ctl_table fs_table[] = {
 852         {
 853                 .ctl_name       = FS_NRINODE,
 854                 .procname       = "inode-nr",
 855                 .data           = &inodes_stat,
 856                 .maxlen         = 2*sizeof(int),
 857                 .mode           = 0444,
 858                 .proc_handler   = &proc_dointvec,
 859         },
 860         {
 861                 .ctl_name       = FS_STATINODE,
 862                 .procname       = "inode-state",
 863                 .data           = &inodes_stat,
 864                 .maxlen         = 7*sizeof(int),
 865                 .mode           = 0444,
 866                 .proc_handler   = &proc_dointvec,
 867         },
 868         {
 869                 .ctl_name       = FS_NRFILE,
 870                 .procname       = "file-nr",
 871                 .data           = &files_stat,
 872                 .maxlen         = 3*sizeof(int),
 873                 .mode           = 0444,
 874                 .proc_handler   = &proc_dointvec,
 875         },
 876         {
 877                 .ctl_name       = FS_MAXFILE,
 878                 .procname       = "file-max",
 879                 .data           = &files_stat.max_files,
 880                 .maxlen         = sizeof(int),
 881                 .mode           = 0644,
 882                 .proc_handler   = &proc_dointvec,
 883         },
 884         {
 885                 .ctl_name       = FS_DENTRY,
 886                 .procname       = "dentry-state",
 887                 .data           = &dentry_stat,
 888                 .maxlen         = 6*sizeof(int),
 889                 .mode           = 0444,
 890                 .proc_handler   = &proc_dointvec,
 891         },
 892         {
 893                 .ctl_name       = FS_OVERFLOWUID,
 894                 .procname       = "overflowuid",
 895                 .data           = &fs_overflowuid,
 896                 .maxlen         = sizeof(int),
 897                 .mode           = 0644,
 898                 .proc_handler   = &proc_dointvec_minmax,
 899                 .strategy       = &sysctl_intvec,
 900                 .extra1         = &minolduid,
 901                 .extra2         = &maxolduid,
 902         },
 903         {
 904                 .ctl_name       = FS_OVERFLOWGID,
 905                 .procname       = "overflowgid",
 906                 .data           = &fs_overflowgid,
 907                 .maxlen         = sizeof(int),
 908                 .mode           = 0644,
 909                 .proc_handler   = &proc_dointvec_minmax,
 910                 .strategy       = &sysctl_intvec,
 911                 .extra1         = &minolduid,
 912                 .extra2         = &maxolduid,
 913         },
 914         {
 915                 .ctl_name       = FS_LEASES,
 916                 .procname       = "leases-enable",
 917                 .data           = &leases_enable,
 918                 .maxlen         = sizeof(int),
 919                 .mode           = 0644,
 920                 .proc_handler   = &proc_dointvec,
 921         },
 922 #ifdef CONFIG_DNOTIFY
 923         {
 924                 .ctl_name       = FS_DIR_NOTIFY,
 925                 .procname       = "dir-notify-enable",
 926                 .data           = &dir_notify_enable,
 927                 .maxlen         = sizeof(int),
 928                 .mode           = 0644,
 929                 .proc_handler   = &proc_dointvec,
 930         },
 931 #endif
 932 #ifdef CONFIG_MMU
 933         {
 934                 .ctl_name       = FS_LEASE_TIME,
 935                 .procname       = "lease-break-time",
 936                 .data           = &lease_break_time,
 937                 .maxlen         = sizeof(int),
 938                 .mode           = 0644,
 939                 .proc_handler   = &proc_dointvec,
 940         },
 941         {
 942                 .ctl_name       = FS_AIO_NR,
 943                 .procname       = "aio-nr",
 944                 .data           = &aio_nr,
 945                 .maxlen         = sizeof(aio_nr),
 946                 .mode           = 0444,
 947                 .proc_handler   = &proc_dointvec,
 948         },
 949         {
 950                 .ctl_name       = FS_AIO_MAX_NR,
 951                 .procname       = "aio-max-nr",
 952                 .data           = &aio_max_nr,
 953                 .maxlen         = sizeof(aio_max_nr),
 954                 .mode           = 0644,
 955                 .proc_handler   = &proc_dointvec,
 956         },
 957 #endif
 958         { .ctl_name = 0 }
 959 };
 960
 961 static ctl_table debug_table[] = {
 962         { .ctl_name = 0 }
 963 };
 964
 965 static ctl_table dev_table[] = {
 966         { .ctl_name = 0 }
 967 };
 968
 969 extern void init_irq_proc (void);
 970
 971 void __init sysctl_init(void)
 972 {
 973 #ifdef CONFIG_PROC_FS
 974         register_proc_table(root_table, proc_sys_root);
 975         init_irq_proc();
 976 #endif
 977 }
 978
 979 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
 980                void __user *newval, size_t newlen)
 981 {
 982         struct list_head *tmp;
 983
 984         if (nlen <= 0 || nlen >= CTL_MAXNAME)
 985                 return -ENOTDIR;
 986         if (oldval) {
 987                 int old_len;
 988                 if (!oldlenp || get_user(old_len, oldlenp))
 989                         return -EFAULT;
 990         }
 991         tmp = &root_table_header.ctl_entry;
 992         do {
 993                 struct ctl_table_header *head =
 994                         list_entry(tmp, struct ctl_table_header, ctl_entry);
 995                 void *context = NULL;
 996                 int error = parse_table(name, nlen, oldval, oldlenp,
 997                                         newval, newlen, head->ctl_table,
 998                                         &context);
 999                 if (context)
1000                         kfree(context);
1001                 if (error != -ENOTDIR)
1002                         return error;
1003                 tmp = tmp->next;
1004         } while (tmp != &root_table_header.ctl_entry);
1005         return -ENOTDIR;
1006 }
1007
1008 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1009 {
1010         struct __sysctl_args tmp;
1011         int error;
1012
1013         if (copy_from_user(&tmp, args, sizeof(tmp)))
1014                 return -EFAULT;
1015
1016         lock_kernel();
1017         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1018                           tmp.newval, tmp.newlen);
1019         unlock_kernel();
1020         return error;
1021 }
1022
1023 /*
1024  * ctl_perm does NOT grant the superuser all rights automatically, because
1025  * some sysctl variables are readonly even to root.
1026  */
1027
1028 static int test_perm(int mode, int op)
1029 {
1030         if (!current->euid)
1031                 mode >>= 6;
1032         else if (in_egroup_p(0))
1033                 mode >>= 3;
1034         if ((mode & op & 0007) == op)
1035                 return 0;
1036         return -EACCES;
1037 }
1038
1039 static inline int ctl_perm(ctl_table *table, int op)
1040 {
1041         int error;
1042         error = security_sysctl(table, op);
1043         if (error)
1044                 return error;
1045         return test_perm(table->mode, op);
1046 }
1047
1048 static int parse_table(int __user *name, int nlen,
1049                        void __user *oldval, size_t __user *oldlenp,
1050                        void __user *newval, size_t newlen,
1051                        ctl_table *table, void **context)
1052 {
1053         int n;
1054 repeat:
1055         if (!nlen)
1056                 return -ENOTDIR;
1057         if (get_user(n, name))
1058                 return -EFAULT;
1059         for ( ; table->ctl_name; table++) {
1060                 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1061                         int error;
1062                         if (table->child) {
1063                                 if (ctl_perm(table, 001))
1064                                         return -EPERM;
1065                                 if (table->strategy) {
1066                                         error = table->strategy(
1067                                                 table, name, nlen,
1068                                                 oldval, oldlenp,
1069                                                 newval, newlen, context);
1070                                         if (error)
1071                                                 return error;
1072                                 }
1073                                 name++;
1074                                 nlen--;
1075                                 table = table->child;
1076                                 goto repeat;
1077                         }
1078                         error = do_sysctl_strategy(table, name, nlen,
1079                                                    oldval, oldlenp,
1080                                                    newval, newlen, context);
1081                         return error;
1082                 }
1083         }
1084         return -ENOTDIR;
1085 }
1086
1087 /* Perform the actual read/write of a sysctl table entry. */
1088 int do_sysctl_strategy (ctl_table *table,
1089                         int __user *name, int nlen,
1090                         void __user *oldval, size_t __user *oldlenp,
1091                         void __user *newval, size_t newlen, void **context)
1092 {
1093         int op = 0, rc;
1094         size_t len;
1095
1096         if (oldval)
1097                 op |= 004;
1098         if (newval)
1099                 op |= 002;
1100         if (ctl_perm(table, op))
1101                 return -EPERM;
1102
1103         if (table->strategy) {
1104                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1105                                      newval, newlen, context);
1106                 if (rc < 0)
1107                         return rc;
1108                 if (rc > 0)
1109                         return 0;
1110         }
1111
1112         /* If there is no strategy routine, or if the strategy returns
1113          * zero, proceed with automatic r/w */
1114         if (table->data && table->maxlen) {
1115                 if (oldval && oldlenp) {
1116                         if (get_user(len, oldlenp))
1117                                 return -EFAULT;
1118                         if (len) {
1119                                 if (len > table->maxlen)
1120                                         len = table->maxlen;
1121                                 if(copy_to_user(oldval, table->data, len))
1122                                         return -EFAULT;
1123                                 if(put_user(len, oldlenp))
1124                                         return -EFAULT;
1125                         }
1126                 }
1127                 if (newval && newlen) {
1128                         len = newlen;
1129                         if (len > table->maxlen)
1130                                 len = table->maxlen;
1131                         if(copy_from_user(table->data, newval, len))
1132                                 return -EFAULT;
1133                 }
1134         }
1135         return 0;
1136 }
1137
1138 /**
1139  * register_sysctl_table - register a sysctl hierarchy
1140  * @table: the top-level table structure
1141  * @insert_at_head: whether the entry should be inserted in front or at the end
1142  *
1143  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1144  * array. An entry with a ctl_name of 0 terminates the table.
1145  *
1146  * The members of the &ctl_table structure are used as follows:
1147  *
1148  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1149  *            must be unique within that level of sysctl
1150  *
1151  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1152  *            enter a sysctl file
1153  *
1154  * data - a pointer to data for use by proc_handler
1155  *
1156  * maxlen - the maximum size in bytes of the data
1157  *
1158  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1159  *
1160  * child - a pointer to the child sysctl table if this entry is a directory, or
1161  *         %NULL.
1162  *
1163  * proc_handler - the text handler routine (described below)
1164  *
1165  * strategy - the strategy routine (described below)
1166  *
1167  * de - for internal use by the sysctl routines
1168  *
1169  * extra1, extra2 - extra pointers usable by the proc handler routines
1170  *
1171  * Leaf nodes in the sysctl tree will be represented by a single file
1172  * under /proc; non-leaf nodes will be represented by directories.
1173  *
1174  * sysctl(2) can automatically manage read and write requests through
1175  * the sysctl table.  The data and maxlen fields of the ctl_table
1176  * struct enable minimal validation of the values being written to be
1177  * performed, and the mode field allows minimal authentication.
1178  *
1179  * More sophisticated management can be enabled by the provision of a
1180  * strategy routine with the table entry.  This will be called before
1181  * any automatic read or write of the data is performed.
1182  *
1183  * The strategy routine may return
1184  *
1185  * < 0 - Error occurred (error is passed to user process)
1186  *
1187  * 0   - OK - proceed with automatic read or write.
1188  *
1189  * > 0 - OK - read or write has been done by the strategy routine, so
1190  *       return immediately.
1191  *
1192  * There must be a proc_handler routine for any terminal nodes
1193  * mirrored under /proc/sys (non-terminals are handled by a built-in
1194  * directory handler).  Several default handlers are available to
1195  * cover common cases -
1196  *
1197  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1198  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1199  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1200  *
1201  * It is the handler's job to read the input buffer from user memory
1202  * and process it. The handler should return 0 on success.
1203  *
1204  * This routine returns %NULL on a failure to register, and a pointer
1205  * to the table header on success.
1206  */
1207 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1208                                                int insert_at_head)
1209 {
1210         struct ctl_table_header *tmp;
1211         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1212         if (!tmp)
1213                 return NULL;
1214         tmp->ctl_table = table;
1215         INIT_LIST_HEAD(&tmp->ctl_entry);
1216         if (insert_at_head)
1217                 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1218         else
1219                 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1220 #ifdef CONFIG_PROC_FS
1221         register_proc_table(table, proc_sys_root);
1222 #endif
1223         return tmp;
1224 }
1225
1226 /**
1227  * unregister_sysctl_table - unregister a sysctl table hierarchy
1228  * @header: the header returned from register_sysctl_table
1229  *
1230  * Unregisters the sysctl table and all children. proc entries may not
1231  * actually be removed until they are no longer used by anyone.
1232  */
1233 void unregister_sysctl_table(struct ctl_table_header * header)
1234 {
1235         list_del(&header->ctl_entry);
1236 #ifdef CONFIG_PROC_FS
1237         unregister_proc_table(header->ctl_table, proc_sys_root);
1238 #endif
1239         kfree(header);
1240 }
1241
1242 /*
1243  * /proc/sys support
1244  */
1245
1246 #ifdef CONFIG_PROC_FS
1247
1248 /* Scan the sysctl entries in table and add them all into /proc */
1249 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root)
1250 {
1251         struct proc_dir_entry *de;
1252         int len;
1253         mode_t mode;
1254
1255         for (; table->ctl_name; table++) {
1256                 /* Can't do anything without a proc name. */
1257                 if (!table->procname)
1258                         continue;
1259                 /* Maybe we can't do anything with it... */
1260                 if (!table->proc_handler && !table->child) {
1261                         printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1262                                 table->procname);
1263                         continue;
1264                 }
1265
1266                 len = strlen(table->procname);
1267                 mode = table->mode;
1268
1269                 de = NULL;
1270                 if (table->proc_handler)
1271                         mode |= S_IFREG;
1272                 else {
1273                         mode |= S_IFDIR;
1274                         for (de = root->subdir; de; de = de->next) {
1275                                 if (proc_match(len, table->procname, de))
1276                                         break;
1277                         }
1278                         /* If the subdir exists already, de is non-NULL */
1279                 }
1280
1281                 if (!de) {
1282                         de = create_proc_entry(table->procname, mode, root);
1283                         if (!de)
1284                                 continue;
1285                         de->data = (void *) table;
1286                         if (table->proc_handler)
1287                                 de->proc_fops = &proc_sys_file_operations;
1288                 }
1289                 table->de = de;
1290                 if (de->mode & S_IFDIR)
1291                         register_proc_table(table->child, de);
1292         }
1293 }
1294
1295 /*
1296  * Unregister a /proc sysctl table and any subdirectories.
1297  */
1298 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1299 {
1300         struct proc_dir_entry *de;
1301         for (; table->ctl_name; table++) {
1302                 if (!(de = table->de))
1303                         continue;
1304                 if (de->mode & S_IFDIR) {
1305                         if (!table->child) {
1306                                 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1307                                 continue;
1308                         }
1309                         unregister_proc_table(table->child, de);
1310
1311                         /* Don't unregister directories which still have entries.. */
1312                         if (de->subdir)
1313                                 continue;
1314                 }
1315
1316                 /* Don't unregister proc entries that are still being used.. */
1317                 if (atomic_read(&de->count))
1318                         continue;
1319
1320                 table->de = NULL;
1321                 remove_proc_entry(table->procname, root);
1322         }
1323 }
1324
1325 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1326                           size_t count, loff_t *ppos)
1327 {
1328         int op;
1329         struct proc_dir_entry *de;
1330         struct ctl_table *table;
1331         size_t res;
1332         ssize_t error;
1333
1334         de = PDE(file->f_dentry->d_inode);
1335         if (!de || !de->data)
1336                 return -ENOTDIR;
1337         table = (struct ctl_table *) de->data;
1338         if (!table || !table->proc_handler)
1339                 return -ENOTDIR;
1340         op = (write ? 002 : 004);
1341         if (ctl_perm(table, op))
1342                 return -EPERM;
1343
1344         res = count;
1345
1346         error = (*table->proc_handler) (table, write, file, buf, &res, ppos);
1347         if (error)
1348                 return error;
1349         return res;
1350 }
1351
1352 static int proc_opensys(struct inode *inode, struct file *file)
1353 {
1354         if (file->f_mode & FMODE_WRITE) {
1355                 /*
1356                  * sysctl entries that are not writable,
1357                  * are _NOT_ writable, capabilities or not.
1358                  */
1359                 if (!(inode->i_mode & S_IWUSR))
1360                         return -EPERM;
1361         }
1362
1363         return 0;
1364 }
1365
1366 static ssize_t proc_readsys(struct file * file, char __user * buf,
1367                             size_t count, loff_t *ppos)
1368 {
1369         return do_rw_proc(0, file, buf, count, ppos);
1370 }
1371
1372 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1373                              size_t count, loff_t *ppos)
1374 {
1375         return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1376 }
1377
1378 /**
1379  * proc_dostring - read a string sysctl
1380  * @table: the sysctl table
1381  * @write: %TRUE if this is a write to the sysctl file
1382  * @filp: the file structure
1383  * @buffer: the user buffer
1384  * @lenp: the size of the user buffer
1385  *
1386  * Reads/writes a string from/to the user buffer. If the kernel
1387  * buffer provided is not large enough to hold the string, the
1388  * string is truncated. The copied string is %NULL-terminated.
1389  * If the string is being read by the user process, it is copied
1390  * and a newline '\n' is added. It is truncated if the buffer is
1391  * not large enough.
1392  *
1393  * Returns 0 on success.
1394  */
1395 int proc_dostring(ctl_table *table, int write, struct file *filp,
1396                   void __user *buffer, size_t *lenp, loff_t *ppos)
1397 {
1398         size_t len, maxlen;
1399         char __user *p;
1400         char c;
1401         void *data;
1402
1403         data = table->data;
1404         maxlen = table->maxlen;
1405         if (table->virt_handler)
1406                 table->virt_handler(table, write, filp->f_xid, &data, &maxlen);
1407
1408         if (!table->data || !table->maxlen || !*lenp ||
1409             (*ppos && !write)) {
1410                 *lenp = 0;
1411                 return 0;
1412         }
1413
1414         if (write) {
1415                 len = 0;
1416                 p = buffer;
1417                 while (len < *lenp) {
1418                         if (get_user(c, p++))
1419                                 return -EFAULT;
1420                         if (c == 0 || c == '\n')
1421                                 break;
1422                         len++;
1423                 }
1424                 if (len >= maxlen)
1425                         len = maxlen-1;
1426                 if(copy_from_user(data, buffer, len))
1427                         return -EFAULT;
1428                 ((char *) data)[len] = 0;
1429                 *ppos += *lenp;
1430         } else {
1431                 len = strlen(data);
1432                 if (len > maxlen)
1433                         len = maxlen;
1434                 if (len > *lenp)
1435                         len = *lenp;
1436                 if (len)
1437                         if(copy_to_user(buffer, data, len))
1438                                 return -EFAULT;
1439                 if (len < *lenp) {
1440                         if(put_user('\n', ((char __user *) buffer) + len))
1441                                 return -EFAULT;
1442                         len++;
1443                 }
1444                 *lenp = len;
1445                 *ppos += len;
1446         }
1447         return 0;
1448 }
1449
1450 /*
1451  *      Special case of dostring for the UTS structure. This has locks
1452  *      to observe. Should this be in kernel/sys.c ????
1453  */
1454
1455 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1456                   void __user *buffer, size_t *lenp, loff_t *ppos)
1457 {
1458         int r;
1459
1460         if (!write) {
1461                 down_read(&uts_sem);
1462                 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1463                 up_read(&uts_sem);
1464         } else {
1465                 down_write(&uts_sem);
1466                 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1467                 up_write(&uts_sem);
1468         }
1469         return r;
1470 }
1471
1472 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1473                                  int *valp,
1474                                  int write, void *data)
1475 {
1476         if (write) {
1477                 *valp = *negp ? -*lvalp : *lvalp;
1478         } else {
1479                 int val = *valp;
1480                 if (val < 0) {
1481                         *negp = -1;
1482                         *lvalp = (unsigned long)-val;
1483                 } else {
1484                         *negp = 0;
1485                         *lvalp = (unsigned long)val;
1486                 }
1487         }
1488         return 0;
1489 }
1490
1491 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1492                   void __user *buffer, size_t *lenp, loff_t *ppos,
1493                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1494                               int write, void *data),
1495                   void *data)
1496 {
1497 #define TMPBUFLEN 21
1498         int *i, vleft, first=1, neg, val;
1499         unsigned long lval;
1500         size_t left, len;
1501
1502         char buf[TMPBUFLEN], *p;
1503         char __user *s = buffer;
1504
1505         if (!table->data || !table->maxlen || !*lenp ||
1506             (*ppos && !write)) {
1507                 *lenp = 0;
1508                 return 0;
1509         }
1510
1511         i = (int *) table->data;
1512         vleft = table->maxlen / sizeof(*i);
1513         left = *lenp;
1514
1515         if (!conv)
1516                 conv = do_proc_dointvec_conv;
1517
1518         for (; left && vleft--; i++, first=0) {
1519                 if (write) {
1520                         while (left) {
1521                                 char c;
1522                                 if (get_user(c, s))
1523                                         return -EFAULT;
1524                                 if (!isspace(c))
1525                                         break;
1526                                 left--;
1527                                 s++;
1528                         }
1529                         if (!left)
1530                                 break;
1531                         neg = 0;
1532                         len = left;
1533                         if (len > sizeof(buf) - 1)
1534                                 len = sizeof(buf) - 1;
1535                         if (copy_from_user(buf, s, len))
1536                                 return -EFAULT;
1537                         buf[len] = 0;
1538                         p = buf;
1539                         if (*p == '-' && left > 1) {
1540                                 neg = 1;
1541                                 left--, p++;
1542                         }
1543                         if (*p < '0' || *p > '9')
1544                                 break;
1545
1546                         lval = simple_strtoul(p, &p, 0);
1547
1548                         len = p-buf;
1549                         if ((len < left) && *p && !isspace(*p))
1550                                 break;
1551                         if (neg)
1552                                 val = -val;
1553                         s += len;
1554                         left -= len;
1555
1556                         if (conv(&neg, &lval, i, 1, data))
1557                                 break;
1558                 } else {
1559                         p = buf;
1560                         if (!first)
1561                                 *p++ = '\t';
1562
1563                         if (conv(&neg, &lval, i, 0, data))
1564                                 break;
1565
1566                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1567                         len = strlen(buf);
1568                         if (len > left)
1569                                 len = left;
1570                         if(copy_to_user(s, buf, len))
1571                                 return -EFAULT;
1572                         left -= len;
1573                         s += len;
1574                 }
1575         }
1576
1577         if (!write && !first && left) {
1578                 if(put_user('\n', s))
1579                         return -EFAULT;
1580                 left--, s++;
1581         }
1582         if (write) {
1583                 while (left) {
1584                         char c;
1585                         if (get_user(c, s++))
1586                                 return -EFAULT;
1587                         if (!isspace(c))
1588                                 break;
1589                         left--;
1590                 }
1591         }
1592         if (write && first)
1593                 return -EINVAL;
1594         *lenp -= left;
1595         *ppos += *lenp;
1596         return 0;
1597 #undef TMPBUFLEN
1598 }
1599
1600 /**
1601  * proc_dointvec - read a vector of integers
1602  * @table: the sysctl table
1603  * @write: %TRUE if this is a write to the sysctl file
1604  * @filp: the file structure
1605  * @buffer: the user buffer
1606  * @lenp: the size of the user buffer
1607  *
1608  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1609  * values from/to the user buffer, treated as an ASCII string.
1610  *
1611  * Returns 0 on success.
1612  */
1613 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1614                      void __user *buffer, size_t *lenp, loff_t *ppos)
1615 {
1616     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1617                             NULL,NULL);
1618 }
1619
1620 #define OP_SET  0
1621 #define OP_AND  1
1622 #define OP_OR   2
1623 #define OP_MAX  3
1624 #define OP_MIN  4
1625
1626 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1627                                       int *valp,
1628                                       int write, void *data)
1629 {
1630         int op = *(int *)data;
1631         if (write) {
1632                 int val = *negp ? -*lvalp : *lvalp;
1633                 switch(op) {
1634                 case OP_SET:    *valp = val; break;
1635                 case OP_AND:    *valp &= val; break;
1636                 case OP_OR:     *valp |= val; break;
1637                 case OP_MAX:    if(*valp < val)
1638                                         *valp = val;
1639                                 break;
1640                 case OP_MIN:    if(*valp > val)
1641                                 *valp = val;
1642                                 break;
1643                 }
1644         } else {
1645                 int val = *valp;
1646                 if (val < 0) {
1647                         *negp = -1;
1648                         *lvalp = (unsigned long)-val;
1649                 } else {
1650                         *negp = 0;
1651                         *lvalp = (unsigned long)val;
1652                 }
1653         }
1654         return 0;
1655 }
1656
1657 /*
1658  *      init may raise the set.
1659  */
1660
1661 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1662                         void __user *buffer, size_t *lenp, loff_t *ppos)
1663 {
1664         int op;
1665
1666         if (!capable(CAP_SYS_MODULE)) {
1667                 return -EPERM;
1668         }
1669
1670         op = (current->pid == 1) ? OP_SET : OP_AND;
1671         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1672                                 do_proc_dointvec_bset_conv,&op);
1673 }
1674
1675 struct do_proc_dointvec_minmax_conv_param {
1676         int *min;
1677         int *max;
1678 };
1679
1680 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1681                                         int *valp,
1682                                         int write, void *data)
1683 {
1684         struct do_proc_dointvec_minmax_conv_param *param = data;
1685         if (write) {
1686                 int val = *negp ? -*lvalp : *lvalp;
1687                 if ((param->min && *param->min > val) ||
1688                     (param->max && *param->max < val))
1689                         return -EINVAL;
1690                 *valp = val;
1691         } else {
1692                 int val = *valp;
1693                 if (val < 0) {
1694                         *negp = -1;
1695                         *lvalp = (unsigned long)-val;
1696                 } else {
1697                         *negp = 0;
1698                         *lvalp = (unsigned long)val;
1699                 }
1700         }
1701         return 0;
1702 }
1703
1704 /**
1705  * proc_dointvec_minmax - read a vector of integers with min/max values
1706  * @table: the sysctl table
1707  * @write: %TRUE if this is a write to the sysctl file
1708  * @filp: the file structure
1709  * @buffer: the user buffer
1710  * @lenp: the size of the user buffer
1711  *
1712  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1713  * values from/to the user buffer, treated as an ASCII string.
1714  *
1715  * This routine will ensure the values are within the range specified by
1716  * table->extra1 (min) and table->extra2 (max).
1717  *
1718  * Returns 0 on success.
1719  */
1720 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1721                   void __user *buffer, size_t *lenp, loff_t *ppos)
1722 {
1723         struct do_proc_dointvec_minmax_conv_param param = {
1724                 .min = (int *) table->extra1,
1725                 .max = (int *) table->extra2,
1726         };
1727         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1728                                 do_proc_dointvec_minmax_conv, &param);
1729 }
1730
1731 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1732                                      struct file *filp,
1733                                      void __user *buffer,
1734                                      size_t *lenp, loff_t *ppos,
1735                                      unsigned long convmul,
1736                                      unsigned long convdiv)
1737 {
1738 #define TMPBUFLEN 21
1739         unsigned long *i, *min, *max, val;
1740         int vleft, first=1, neg;
1741         size_t len, left;
1742         char buf[TMPBUFLEN], *p;
1743         char __user *s = buffer;
1744
1745         if (!table->data || !table->maxlen || !*lenp ||
1746             (*ppos && !write)) {
1747                 *lenp = 0;
1748                 return 0;
1749         }
1750
1751         i = (unsigned long *) table->data;
1752         min = (unsigned long *) table->extra1;
1753         max = (unsigned long *) table->extra2;
1754         vleft = table->maxlen / sizeof(unsigned long);
1755         left = *lenp;
1756
1757         for (; left && vleft--; i++, min++, max++, first=0) {
1758                 if (write) {
1759                         while (left) {
1760                                 char c;
1761                                 if (get_user(c, s))
1762                                         return -EFAULT;
1763                                 if (!isspace(c))
1764                                         break;
1765                                 left--;
1766                                 s++;
1767                         }
1768                         if (!left)
1769                                 break;
1770                         neg = 0;
1771                         len = left;
1772                         if (len > TMPBUFLEN-1)
1773                                 len = TMPBUFLEN-1;
1774                         if (copy_from_user(buf, s, len))
1775                                 return -EFAULT;
1776                         buf[len] = 0;
1777                         p = buf;
1778                         if (*p == '-' && left > 1) {
1779                                 neg = 1;
1780                                 left--, p++;
1781                         }
1782                         if (*p < '0' || *p > '9')
1783                                 break;
1784                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1785                         len = p-buf;
1786                         if ((len < left) && *p && !isspace(*p))
1787                                 break;
1788                         if (neg)
1789                                 val = -val;
1790                         s += len;
1791                         left -= len;
1792
1793                         if(neg)
1794                                 continue;
1795                         if ((min && val < *min) || (max && val > *max))
1796                                 continue;
1797                         *i = val;
1798                 } else {
1799                         p = buf;
1800                         if (!first)
1801                                 *p++ = '\t';
1802                         sprintf(p, "%lu", convdiv * (*i) / convmul);
1803                         len = strlen(buf);
1804                         if (len > left)
1805                                 len = left;
1806                         if(copy_to_user(s, buf, len))
1807                                 return -EFAULT;
1808                         left -= len;
1809                         s += len;
1810                 }
1811         }
1812
1813         if (!write && !first && left) {
1814                 if(put_user('\n', s))
1815                         return -EFAULT;
1816                 left--, s++;
1817         }
1818         if (write) {
1819                 while (left) {
1820                         char c;
1821                         if (get_user(c, s++))
1822                                 return -EFAULT;
1823                         if (!isspace(c))
1824                                 break;
1825                         left--;
1826                 }
1827         }
1828         if (write && first)
1829                 return -EINVAL;
1830         *lenp -= left;
1831         *ppos += *lenp;
1832         return 0;
1833 #undef TMPBUFLEN
1834 }
1835
1836 /**
1837  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1838  * @table: the sysctl table
1839  * @write: %TRUE if this is a write to the sysctl file
1840  * @filp: the file structure
1841  * @buffer: the user buffer
1842  * @lenp: the size of the user buffer
1843  *
1844  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1845  * values from/to the user buffer, treated as an ASCII string.
1846  *
1847  * This routine will ensure the values are within the range specified by
1848  * table->extra1 (min) and table->extra2 (max).
1849  *
1850  * Returns 0 on success.
1851  */
1852 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1853                            void __user *buffer, size_t *lenp, loff_t *ppos)
1854 {
1855     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1856 }
1857
1858 /**
1859  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1860  * @table: the sysctl table
1861  * @write: %TRUE if this is a write to the sysctl file
1862  * @filp: the file structure
1863  * @buffer: the user buffer
1864  * @lenp: the size of the user buffer
1865  *
1866  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1867  * values from/to the user buffer, treated as an ASCII string. The values
1868  * are treated as milliseconds, and converted to jiffies when they are stored.
1869  *
1870  * This routine will ensure the values are within the range specified by
1871  * table->extra1 (min) and table->extra2 (max).
1872  *
1873  * Returns 0 on success.
1874  */
1875 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1876                                       struct file *filp,
1877                                       void __user *buffer,
1878                                       size_t *lenp, loff_t *ppos)
1879 {
1880     return do_proc_doulongvec_minmax(table, write, filp, buffer,
1881                                      lenp, ppos, HZ, 1000l);
1882 }
1883
1884
1885 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
1886                                          int *valp,
1887                                          int write, void *data)
1888 {
1889         if (write) {
1890                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1891         } else {
1892                 int val = *valp;
1893                 unsigned long lval;
1894                 if (val < 0) {
1895                         *negp = -1;
1896                         lval = (unsigned long)-val;
1897                 } else {
1898                         *negp = 0;
1899                         lval = (unsigned long)val;
1900                 }
1901                 *lvalp = lval / HZ;
1902         }
1903         return 0;
1904 }
1905
1906 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
1907                                                 int *valp,
1908                                                 int write, void *data)
1909 {
1910         if (write) {
1911                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1912         } else {
1913                 int val = *valp;
1914                 unsigned long lval;
1915                 if (val < 0) {
1916                         *negp = -1;
1917                         lval = (unsigned long)-val;
1918                 } else {
1919                         *negp = 0;
1920                         lval = (unsigned long)val;
1921                 }
1922                 *lvalp = jiffies_to_clock_t(lval);
1923         }
1924         return 0;
1925 }
1926
1927 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
1928                                             int *valp,
1929                                             int write, void *data)
1930 {
1931         if (write) {
1932                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1933         } else {
1934                 int val = *valp;
1935                 unsigned long lval;
1936                 if (val < 0) {
1937                         *negp = -1;
1938                         lval = (unsigned long)-val;
1939                 } else {
1940                         *negp = 0;
1941                         lval = (unsigned long)val;
1942                 }
1943                 *lvalp = jiffies_to_msecs(lval);
1944         }
1945         return 0;
1946 }
1947
1948 /**
1949  * proc_dointvec_jiffies - read a vector of integers as seconds
1950  * @table: the sysctl table
1951  * @write: %TRUE if this is a write to the sysctl file
1952  * @filp: the file structure
1953  * @buffer: the user buffer
1954  * @lenp: the size of the user buffer
1955  *
1956  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1957  * values from/to the user buffer, treated as an ASCII string.
1958  * The values read are assumed to be in seconds, and are converted into
1959  * jiffies.
1960  *
1961  * Returns 0 on success.
1962  */
1963 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
1964                           void __user *buffer, size_t *lenp, loff_t *ppos)
1965 {
1966     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1967                             do_proc_dointvec_jiffies_conv,NULL);
1968 }
1969
1970 /**
1971  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1972  * @table: the sysctl table
1973  * @write: %TRUE if this is a write to the sysctl file
1974  * @filp: the file structure
1975  * @buffer: the user buffer
1976  * @lenp: the size of the user buffer
1977  *
1978  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1979  * values from/to the user buffer, treated as an ASCII string.
1980  * The values read are assumed to be in 1/USER_HZ seconds, and
1981  * are converted into jiffies.
1982  *
1983  * Returns 0 on success.
1984  */
1985 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
1986                                  void __user *buffer, size_t *lenp, loff_t *ppos)
1987 {
1988     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1989                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1990 }
1991
1992 /**
1993  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1994  * @table: the sysctl table
1995  * @write: %TRUE if this is a write to the sysctl file
1996  * @filp: the file structure
1997  * @buffer: the user buffer
1998  * @lenp: the size of the user buffer
1999  *
2000  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2001  * values from/to the user buffer, treated as an ASCII string.
2002  * The values read are assumed to be in 1/1000 seconds, and
2003  * are converted into jiffies.
2004  *
2005  * Returns 0 on success.
2006  */
2007 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2008                              void __user *buffer, size_t *lenp, loff_t *ppos)
2009 {
2010         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2011                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2012 }
2013
2014 #else /* CONFIG_PROC_FS */
2015
2016 int proc_dostring(ctl_table *table, int write, struct file *filp,
2017                   void __user *buffer, size_t *lenp, loff_t *ppos)
2018 {
2019         return -ENOSYS;
2020 }
2021
2022 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2023                             void __user *buffer, size_t *lenp, loff_t *ppos)
2024 {
2025         return -ENOSYS;
2026 }
2027
2028 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2029                   void __user *buffer, size_t *lenp, loff_t *ppos)
2030 {
2031         return -ENOSYS;
2032 }
2033
2034 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2035                         void __user *buffer, size_t *lenp, loff_t *ppos)
2036 {
2037         return -ENOSYS;
2038 }
2039
2040 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2041                     void __user *buffer, size_t *lenp, loff_t *ppos)
2042 {
2043         return -ENOSYS;
2044 }
2045
2046 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2047                     void __user *buffer, size_t *lenp, loff_t *ppos)
2048 {
2049         return -ENOSYS;
2050 }
2051
2052 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2053                     void __user *buffer, size_t *lenp, loff_t *ppos)
2054 {
2055         return -ENOSYS;
2056 }
2057
2058 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2059                              void __user *buffer, size_t *lenp, loff_t *ppos)
2060 {
2061         return -ENOSYS;
2062 }
2063
2064 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2065                     void __user *buffer, size_t *lenp, loff_t *ppos)
2066 {
2067         return -ENOSYS;
2068 }
2069
2070 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2071                                       struct file *filp,
2072                                       void __user *buffer,
2073                                       size_t *lenp, loff_t *ppos)
2074 {
2075     return -ENOSYS;
2076 }
2077
2078
2079 #endif /* CONFIG_PROC_FS */
2080
2081
2082 /*
2083  * General sysctl support routines
2084  */
2085
2086 /* The generic string strategy routine: */
2087 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2088                   void __user *oldval, size_t __user *oldlenp,
2089                   void __user *newval, size_t newlen, void **context)
2090 {
2091         size_t l, len;
2092
2093         if (!table->data || !table->maxlen)
2094                 return -ENOTDIR;
2095
2096         if (oldval && oldlenp) {
2097                 if (get_user(len, oldlenp))
2098                         return -EFAULT;
2099                 if (len) {
2100                         l = strlen(table->data);
2101                         if (len > l) len = l;
2102                         if (len >= table->maxlen)
2103                                 len = table->maxlen;
2104                         if(copy_to_user(oldval, table->data, len))
2105                                 return -EFAULT;
2106                         if(put_user(0, ((char __user *) oldval) + len))
2107                                 return -EFAULT;
2108                         if(put_user(len, oldlenp))
2109                                 return -EFAULT;
2110                 }
2111         }
2112         if (newval && newlen) {
2113                 len = newlen;
2114                 if (len > table->maxlen)
2115                         len = table->maxlen;
2116                 if(copy_from_user(table->data, newval, len))
2117                         return -EFAULT;
2118                 if (len == table->maxlen)
2119                         len--;
2120                 ((char *) table->data)[len] = 0;
2121         }
2122         return 0;
2123 }
2124
2125 /*
2126  * This function makes sure that all of the integers in the vector
2127  * are between the minimum and maximum values given in the arrays
2128  * table->extra1 and table->extra2, respectively.
2129  */
2130 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2131                 void __user *oldval, size_t __user *oldlenp,
2132                 void __user *newval, size_t newlen, void **context)
2133 {
2134
2135         if (newval && newlen) {
2136                 int __user *vec = (int __user *) newval;
2137                 int *min = (int *) table->extra1;
2138                 int *max = (int *) table->extra2;
2139                 size_t length;
2140                 int i;
2141
2142                 if (newlen % sizeof(int) != 0)
2143                         return -EINVAL;
2144
2145                 if (!table->extra1 && !table->extra2)
2146                         return 0;
2147
2148                 if (newlen > table->maxlen)
2149                         newlen = table->maxlen;
2150                 length = newlen / sizeof(int);
2151
2152                 for (i = 0; i < length; i++) {
2153                         int value;
2154                         if (get_user(value, vec + i))
2155                                 return -EFAULT;
2156                         if (min && value < min[i])
2157                                 return -EINVAL;
2158                         if (max && value > max[i])
2159                                 return -EINVAL;
2160                 }
2161         }
2162         return 0;
2163 }
2164
2165 /* Strategy function to convert jiffies to seconds */
2166 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2167                 void __user *oldval, size_t __user *oldlenp,
2168                 void __user *newval, size_t newlen, void **context)
2169 {
2170         if (oldval) {
2171                 size_t olen;
2172                 if (oldlenp) {
2173                         if (get_user(olen, oldlenp))
2174                                 return -EFAULT;
2175                         if (olen!=sizeof(int))
2176                                 return -EINVAL;
2177                 }
2178                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2179                     (oldlenp && put_user(sizeof(int),oldlenp)))
2180                         return -EFAULT;
2181         }
2182         if (newval && newlen) {
2183                 int new;
2184                 if (newlen != sizeof(int))
2185                         return -EINVAL;
2186                 if (get_user(new, (int __user *)newval))
2187                         return -EFAULT;
2188                 *(int *)(table->data) = new*HZ;
2189         }
2190         return 1;
2191 }
2192
2193 /* Strategy function to convert jiffies to seconds */
2194 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2195                 void __user *oldval, size_t __user *oldlenp,
2196                 void __user *newval, size_t newlen, void **context)
2197 {
2198         if (oldval) {
2199                 size_t olen;
2200                 if (oldlenp) {
2201                         if (get_user(olen, oldlenp))
2202                                 return -EFAULT;
2203                         if (olen!=sizeof(int))
2204                                 return -EINVAL;
2205                 }
2206                 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2207                     (oldlenp && put_user(sizeof(int),oldlenp)))
2208                         return -EFAULT;
2209         }
2210         if (newval && newlen) {
2211                 int new;
2212                 if (newlen != sizeof(int))
2213                         return -EINVAL;
2214                 if (get_user(new, (int __user *)newval))
2215                         return -EFAULT;
2216                 *(int *)(table->data) = msecs_to_jiffies(new);
2217         }
2218         return 1;
2219 }
2220
2221 #else /* CONFIG_SYSCTL */
2222
2223
2224 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2225 {
2226         return -ENOSYS;
2227 }
2228
2229 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2230                   void __user *oldval, size_t __user *oldlenp,
2231                   void __user *newval, size_t newlen, void **context)
2232 {
2233         return -ENOSYS;
2234 }
2235
2236 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2237                 void __user *oldval, size_t __user *oldlenp,
2238                 void __user *newval, size_t newlen, void **context)
2239 {
2240         return -ENOSYS;
2241 }
2242
2243 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2244                 void __user *oldval, size_t __user *oldlenp,
2245                 void __user *newval, size_t newlen, void **context)
2246 {
2247         return -ENOSYS;
2248 }
2249
2250 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2251                 void __user *oldval, size_t __user *oldlenp,
2252                 void __user *newval, size_t newlen, void **context)
2253 {
2254         return -ENOSYS;
2255 }
2256
2257 int proc_dostring(ctl_table *table, int write, struct file *filp,
2258                   void __user *buffer, size_t *lenp, loff_t *ppos)
2259 {
2260         return -ENOSYS;
2261 }
2262
2263 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2264                   void __user *buffer, size_t *lenp, loff_t *ppos)
2265 {
2266         return -ENOSYS;
2267 }
2268
2269 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2270                         void __user *buffer, size_t *lenp, loff_t *ppos)
2271 {
2272         return -ENOSYS;
2273 }
2274
2275 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2276                     void __user *buffer, size_t *lenp, loff_t *ppos)
2277 {
2278         return -ENOSYS;
2279 }
2280
2281 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2282                           void __user *buffer, size_t *lenp, loff_t *ppos)
2283 {
2284         return -ENOSYS;
2285 }
2286
2287 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2288                           void __user *buffer, size_t *lenp, loff_t *ppos)
2289 {
2290         return -ENOSYS;
2291 }
2292
2293 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2294                              void __user *buffer, size_t *lenp, loff_t *ppos)
2295 {
2296         return -ENOSYS;
2297 }
2298
2299 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2300                     void __user *buffer, size_t *lenp, loff_t *ppos)
2301 {
2302         return -ENOSYS;
2303 }
2304
2305 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2306                                       struct file *filp,
2307                                       void __user *buffer,
2308                                       size_t *lenp, loff_t *ppos)
2309 {
2310     return -ENOSYS;
2311 }
2312
2313 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2314                                                 int insert_at_head)
2315 {
2316         return NULL;
2317 }
2318
2319 void unregister_sysctl_table(struct ctl_table_header * table)
2320 {
2321 }
2322
2323 #endif /* CONFIG_SYSCTL */
2324
2325 /*
2326  * No sense putting this after each symbol definition, twice,
2327  * exception granted :-)
2328  */
2329 EXPORT_SYMBOL(proc_dointvec);
2330 EXPORT_SYMBOL(proc_dointvec_jiffies);
2331 EXPORT_SYMBOL(proc_dointvec_minmax);
2332 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2333 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2334 EXPORT_SYMBOL(proc_dostring);
2335 EXPORT_SYMBOL(proc_doulongvec_minmax);
2336 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2337 EXPORT_SYMBOL(register_sysctl_table);
2338 EXPORT_SYMBOL(sysctl_intvec);
2339 EXPORT_SYMBOL(sysctl_jiffies);
2340 EXPORT_SYMBOL(sysctl_ms_jiffies);
2341 EXPORT_SYMBOL(sysctl_string);
2342 EXPORT_SYMBOL(unregister_sysctl_table);