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
  45 #include <asm/uaccess.h>
  46 #include <asm/processor.h>
  47
  48 #ifdef CONFIG_ROOT_NFS
  49 #include <linux/nfs_fs.h>
  50 #endif
  51
  52 #if defined(CONFIG_SYSCTL)
  53
  54 /* External variables not in a header file. */
  55 extern int C_A_D;
  56 extern int sysctl_overcommit_memory;
  57 extern int sysctl_overcommit_ratio;
  58 extern int max_threads;
  59 extern int sysrq_enabled;
  60 extern int core_uses_pid;
  61 extern int suid_dumpable;
  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 #ifdef CONFIG_CHR_DEV_SG
  89 extern int sg_big_buff;
  90 #endif
  91 #ifdef CONFIG_SYSVIPC
  92 extern size_t shm_ctlmax;
  93 extern size_t shm_ctlall;
  94 extern int shm_ctlmni;
  95 extern int msg_ctlmax;
  96 extern int msg_ctlmnb;
  97 extern int msg_ctlmni;
  98 extern int sem_ctls[];
  99 #endif
 100
 101 #ifdef __sparc__
 102 extern char reboot_command [];
 103 extern int stop_a_enabled;
 104 extern int scons_pwroff;
 105 #endif
 106
 107 #ifdef __hppa__
 108 extern int pwrsw_enabled;
 109 extern int unaligned_enabled;
 110 #endif
 111
 112 #ifdef CONFIG_ARCH_S390
 113 #ifdef CONFIG_MATHEMU
 114 extern int sysctl_ieee_emulation_warnings;
 115 #endif
 116 extern int sysctl_userprocess_debug;
 117 #endif
 118
 119 extern int sysctl_hz_timer;
 120
 121 #ifdef CONFIG_BSD_PROCESS_ACCT
 122 extern int acct_parm[];
 123 #endif
 124
 125 int randomize_va_space = 1;
 126
 127 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
 128                        ctl_table *, void **);
 129 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
 130                   void __user *buffer, size_t *lenp, loff_t *ppos);
 131
 132 static ctl_table root_table[];
 133 static struct ctl_table_header root_table_header =
 134         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 135
 136 static ctl_table kern_table[];
 137 static ctl_table vm_table[];
 138 #ifdef CONFIG_NET
 139 extern ctl_table net_table[];
 140 #endif
 141 static ctl_table proc_table[];
 142 static ctl_table fs_table[];
 143 static ctl_table debug_table[];
 144 static ctl_table dev_table[];
 145 extern ctl_table random_table[];
 146 #ifdef CONFIG_UNIX98_PTYS
 147 extern ctl_table pty_table[];
 148 #endif
 149
 150 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 151 int sysctl_legacy_va_layout;
 152 #endif
 153
 154 /* /proc declarations: */
 155
 156 #ifdef CONFIG_PROC_FS
 157
 158 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
 159 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
 160 static int proc_opensys(struct inode *, struct file *);
 161
 162 struct file_operations proc_sys_file_operations = {
 163         .open           = proc_opensys,
 164         .read           = proc_readsys,
 165         .write          = proc_writesys,
 166 };
 167
 168 extern struct proc_dir_entry *proc_sys_root;
 169
 170 static void register_proc_table(ctl_table *, struct proc_dir_entry *);
 171 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
 172 #endif
 173
 174 /* The default sysctl tables: */
 175
 176 static ctl_table root_table[] = {
 177         {
 178                 .ctl_name       = CTL_KERN,
 179                 .procname       = "kernel",
 180                 .mode           = 0555,
 181                 .child          = kern_table,
 182         },
 183         {
 184                 .ctl_name       = CTL_VM,
 185                 .procname       = "vm",
 186                 .mode           = 0555,
 187                 .child          = vm_table,
 188         },
 189 #ifdef CONFIG_NET
 190         {
 191                 .ctl_name       = CTL_NET,
 192                 .procname       = "net",
 193                 .mode           = 0555,
 194                 .child          = net_table,
 195         },
 196 #endif
 197         {
 198                 .ctl_name       = CTL_PROC,
 199                 .procname       = "proc",
 200                 .mode           = 0555,
 201                 .child          = proc_table,
 202         },
 203         {
 204                 .ctl_name       = CTL_FS,
 205                 .procname       = "fs",
 206                 .mode           = 0555,
 207                 .child          = fs_table,
 208         },
 209         {
 210                 .ctl_name       = CTL_DEBUG,
 211                 .procname       = "debug",
 212                 .mode           = 0555,
 213                 .child          = debug_table,
 214         },
 215         {
 216                 .ctl_name       = CTL_DEV,
 217                 .procname       = "dev",
 218                 .mode           = 0555,
 219                 .child          = dev_table,
 220         },
 221         { .ctl_name = 0 }
 222 };
 223
 224 static ctl_table kern_table[] = {
 225         {
 226                 .ctl_name       = KERN_OSTYPE,
 227                 .procname       = "ostype",
 228                 .data           = system_utsname.sysname,
 229                 .maxlen         = sizeof(system_utsname.sysname),
 230                 .mode           = 0444,
 231                 .proc_handler   = &proc_doutsstring,
 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                 .strategy       = &sysctl_string,
 242         },
 243         {
 244                 .ctl_name       = KERN_VERSION,
 245                 .procname       = "version",
 246                 .data           = system_utsname.version,
 247                 .maxlen         = sizeof(system_utsname.version),
 248                 .mode           = 0444,
 249                 .proc_handler   = &proc_doutsstring,
 250                 .strategy       = &sysctl_string,
 251         },
 252         {
 253                 .ctl_name       = KERN_NODENAME,
 254                 .procname       = "hostname",
 255                 .data           = system_utsname.nodename,
 256                 .maxlen         = sizeof(system_utsname.nodename),
 257                 .mode           = 0644,
 258                 .proc_handler   = &proc_doutsstring,
 259                 .strategy       = &sysctl_string,
 260         },
 261         {
 262                 .ctl_name       = KERN_DOMAINNAME,
 263                 .procname       = "domainname",
 264                 .data           = system_utsname.domainname,
 265                 .maxlen         = sizeof(system_utsname.domainname),
 266                 .mode           = 0644,
 267                 .proc_handler   = &proc_doutsstring,
 268                 .strategy       = &sysctl_string,
 269         },
 270         {
 271                 .ctl_name       = KERN_PANIC,
 272                 .procname       = "panic",
 273                 .data           = &panic_timeout,
 274                 .maxlen         = sizeof(int),
 275                 .mode           = 0644,
 276                 .proc_handler   = &proc_dointvec,
 277         },
 278         {
 279                 .ctl_name       = KERN_CORE_USES_PID,
 280                 .procname       = "core_uses_pid",
 281                 .data           = &core_uses_pid,
 282                 .maxlen         = sizeof(int),
 283                 .mode           = 0644,
 284                 .proc_handler   = &proc_dointvec,
 285         },
 286         {
 287                 .ctl_name       = KERN_CORE_PATTERN,
 288                 .procname       = "core_pattern",
 289                 .data           = core_pattern,
 290                 .maxlen         = 64,
 291                 .mode           = 0644,
 292                 .proc_handler   = &proc_dostring,
 293                 .strategy       = &sysctl_string,
 294         },
 295         {
 296                 .ctl_name       = KERN_TAINTED,
 297                 .procname       = "tainted",
 298                 .data           = &tainted,
 299                 .maxlen         = sizeof(int),
 300                 .mode           = 0444,
 301                 .proc_handler   = &proc_dointvec,
 302         },
 303         {
 304                 .ctl_name       = KERN_CAP_BSET,
 305                 .procname       = "cap-bound",
 306                 .data           = &cap_bset,
 307                 .maxlen         = sizeof(kernel_cap_t),
 308                 .mode           = 0600,
 309                 .proc_handler   = &proc_dointvec_bset,
 310         },
 311 #ifdef CONFIG_BLK_DEV_INITRD
 312         {
 313                 .ctl_name       = KERN_REALROOTDEV,
 314                 .procname       = "real-root-dev",
 315                 .data           = &real_root_dev,
 316                 .maxlen         = sizeof(int),
 317                 .mode           = 0644,
 318                 .proc_handler   = &proc_dointvec,
 319         },
 320 #endif
 321 #ifdef __sparc__
 322         {
 323                 .ctl_name       = KERN_SPARC_REBOOT,
 324                 .procname       = "reboot-cmd",
 325                 .data           = reboot_command,
 326                 .maxlen         = 256,
 327                 .mode           = 0644,
 328                 .proc_handler   = &proc_dostring,
 329                 .strategy       = &sysctl_string,
 330         },
 331         {
 332                 .ctl_name       = KERN_SPARC_STOP_A,
 333                 .procname       = "stop-a",
 334                 .data           = &stop_a_enabled,
 335                 .maxlen         = sizeof (int),
 336                 .mode           = 0644,
 337                 .proc_handler   = &proc_dointvec,
 338         },
 339         {
 340                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 341                 .procname       = "scons-poweroff",
 342                 .data           = &scons_pwroff,
 343                 .maxlen         = sizeof (int),
 344                 .mode           = 0644,
 345                 .proc_handler   = &proc_dointvec,
 346         },
 347 #endif
 348 #ifdef __hppa__
 349         {
 350                 .ctl_name       = KERN_HPPA_PWRSW,
 351                 .procname       = "soft-power",
 352                 .data           = &pwrsw_enabled,
 353                 .maxlen         = sizeof (int),
 354                 .mode           = 0644,
 355                 .proc_handler   = &proc_dointvec,
 356         },
 357         {
 358                 .ctl_name       = KERN_HPPA_UNALIGNED,
 359                 .procname       = "unaligned-trap",
 360                 .data           = &unaligned_enabled,
 361                 .maxlen         = sizeof (int),
 362                 .mode           = 0644,
 363                 .proc_handler   = &proc_dointvec,
 364         },
 365 #endif
 366         {
 367                 .ctl_name       = KERN_CTLALTDEL,
 368                 .procname       = "ctrl-alt-del",
 369                 .data           = &C_A_D,
 370                 .maxlen         = sizeof(int),
 371                 .mode           = 0644,
 372                 .proc_handler   = &proc_dointvec,
 373         },
 374         {
 375                 .ctl_name       = KERN_PRINTK,
 376                 .procname       = "printk",
 377                 .data           = &console_loglevel,
 378                 .maxlen         = 4*sizeof(int),
 379                 .mode           = 0644,
 380                 .proc_handler   = &proc_dointvec,
 381         },
 382 #ifdef CONFIG_KMOD
 383         {
 384                 .ctl_name       = KERN_MODPROBE,
 385                 .procname       = "modprobe",
 386                 .data           = &modprobe_path,
 387                 .maxlen         = KMOD_PATH_LEN,
 388                 .mode           = 0644,
 389                 .proc_handler   = &proc_dostring,
 390                 .strategy       = &sysctl_string,
 391         },
 392 #endif
 393 #ifdef CONFIG_HOTPLUG
 394         {
 395                 .ctl_name       = KERN_HOTPLUG,
 396                 .procname       = "hotplug",
 397                 .data           = &hotplug_path,
 398                 .maxlen         = HOTPLUG_PATH_LEN,
 399                 .mode           = 0644,
 400                 .proc_handler   = &proc_dostring,
 401                 .strategy       = &sysctl_string,
 402         },
 403 #endif
 404 #ifdef CONFIG_CHR_DEV_SG
 405         {
 406                 .ctl_name       = KERN_SG_BIG_BUFF,
 407                 .procname       = "sg-big-buff",
 408                 .data           = &sg_big_buff,
 409                 .maxlen         = sizeof (int),
 410                 .mode           = 0444,
 411                 .proc_handler   = &proc_dointvec,
 412         },
 413 #endif
 414 #ifdef CONFIG_BSD_PROCESS_ACCT
 415         {
 416                 .ctl_name       = KERN_ACCT,
 417                 .procname       = "acct",
 418                 .data           = &acct_parm,
 419                 .maxlen         = 3*sizeof(int),
 420                 .mode           = 0644,
 421                 .proc_handler   = &proc_dointvec,
 422         },
 423 #endif
 424 #ifdef CONFIG_SYSVIPC
 425         {
 426                 .ctl_name       = KERN_SHMMAX,
 427                 .procname       = "shmmax",
 428                 .data           = &shm_ctlmax,
 429                 .maxlen         = sizeof (size_t),
 430                 .mode           = 0644,
 431                 .proc_handler   = &proc_doulongvec_minmax,
 432         },
 433         {
 434                 .ctl_name       = KERN_SHMALL,
 435                 .procname       = "shmall",
 436                 .data           = &shm_ctlall,
 437                 .maxlen         = sizeof (size_t),
 438                 .mode           = 0644,
 439                 .proc_handler   = &proc_doulongvec_minmax,
 440         },
 441         {
 442                 .ctl_name       = KERN_SHMMNI,
 443                 .procname       = "shmmni",
 444                 .data           = &shm_ctlmni,
 445                 .maxlen         = sizeof (int),
 446                 .mode           = 0644,
 447                 .proc_handler   = &proc_dointvec,
 448         },
 449         {
 450                 .ctl_name       = KERN_MSGMAX,
 451                 .procname       = "msgmax",
 452                 .data           = &msg_ctlmax,
 453                 .maxlen         = sizeof (int),
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dointvec,
 456         },
 457         {
 458                 .ctl_name       = KERN_MSGMNI,
 459                 .procname       = "msgmni",
 460                 .data           = &msg_ctlmni,
 461                 .maxlen         = sizeof (int),
 462                 .mode           = 0644,
 463                 .proc_handler   = &proc_dointvec,
 464         },
 465         {
 466                 .ctl_name       = KERN_MSGMNB,
 467                 .procname       =  "msgmnb",
 468                 .data           = &msg_ctlmnb,
 469                 .maxlen         = sizeof (int),
 470                 .mode           = 0644,
 471                 .proc_handler   = &proc_dointvec,
 472         },
 473         {
 474                 .ctl_name       = KERN_SEM,
 475                 .procname       = "sem",
 476                 .data           = &sem_ctls,
 477                 .maxlen         = 4*sizeof (int),
 478                 .mode           = 0644,
 479                 .proc_handler   = &proc_dointvec,
 480         },
 481 #endif
 482 #ifdef CONFIG_MAGIC_SYSRQ
 483         {
 484                 .ctl_name       = KERN_SYSRQ,
 485                 .procname       = "sysrq",
 486                 .data           = &sysrq_enabled,
 487                 .maxlen         = sizeof (int),
 488                 .mode           = 0644,
 489                 .proc_handler   = &proc_dointvec,
 490         },
 491 #endif
 492         {
 493                 .ctl_name       = KERN_CADPID,
 494                 .procname       = "cad_pid",
 495                 .data           = &cad_pid,
 496                 .maxlen         = sizeof (int),
 497                 .mode           = 0600,
 498                 .proc_handler   = &proc_dointvec,
 499         },
 500         {
 501                 .ctl_name       = KERN_MAX_THREADS,
 502                 .procname       = "threads-max",
 503                 .data           = &max_threads,
 504                 .maxlen         = sizeof(int),
 505                 .mode           = 0644,
 506                 .proc_handler   = &proc_dointvec,
 507         },
 508         {
 509                 .ctl_name       = KERN_RANDOM,
 510                 .procname       = "random",
 511                 .mode           = 0555,
 512                 .child          = random_table,
 513         },
 514 #ifdef CONFIG_UNIX98_PTYS
 515         {
 516                 .ctl_name       = KERN_PTY,
 517                 .procname       = "pty",
 518                 .mode           = 0555,
 519                 .child          = pty_table,
 520         },
 521 #endif
 522         {
 523                 .ctl_name       = KERN_OVERFLOWUID,
 524                 .procname       = "overflowuid",
 525                 .data           = &overflowuid,
 526                 .maxlen         = sizeof(int),
 527                 .mode           = 0644,
 528                 .proc_handler   = &proc_dointvec_minmax,
 529                 .strategy       = &sysctl_intvec,
 530                 .extra1         = &minolduid,
 531                 .extra2         = &maxolduid,
 532         },
 533         {
 534                 .ctl_name       = KERN_OVERFLOWGID,
 535                 .procname       = "overflowgid",
 536                 .data           = &overflowgid,
 537                 .maxlen         = sizeof(int),
 538                 .mode           = 0644,
 539                 .proc_handler   = &proc_dointvec_minmax,
 540                 .strategy       = &sysctl_intvec,
 541                 .extra1         = &minolduid,
 542                 .extra2         = &maxolduid,
 543         },
 544 #ifdef CONFIG_ARCH_S390
 545 #ifdef CONFIG_MATHEMU
 546         {
 547                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 548                 .procname       = "ieee_emulation_warnings",
 549                 .data           = &sysctl_ieee_emulation_warnings,
 550                 .maxlen         = sizeof(int),
 551                 .mode           = 0644,
 552                 .proc_handler   = &proc_dointvec,
 553         },
 554 #endif
 555 #ifdef CONFIG_NO_IDLE_HZ
 556         {
 557                 .ctl_name       = KERN_HZ_TIMER,
 558                 .procname       = "hz_timer",
 559                 .data           = &sysctl_hz_timer,
 560                 .maxlen         = sizeof(int),
 561                 .mode           = 0644,
 562                 .proc_handler   = &proc_dointvec,
 563         },
 564 #endif
 565         {
 566                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 567                 .procname       = "userprocess_debug",
 568                 .data           = &sysctl_userprocess_debug,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec,
 572         },
 573 #endif
 574         {
 575                 .ctl_name       = KERN_PIDMAX,
 576                 .procname       = "pid_max",
 577                 .data           = &pid_max,
 578                 .maxlen         = sizeof (int),
 579                 .mode           = 0644,
 580                 .proc_handler   = &proc_dointvec_minmax,
 581                 .strategy       = sysctl_intvec,
 582                 .extra1         = &pid_max_min,
 583                 .extra2         = &pid_max_max,
 584         },
 585         {
 586                 .ctl_name       = KERN_PANIC_ON_OOPS,
 587                 .procname       = "panic_on_oops",
 588                 .data           = &panic_on_oops,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = &proc_dointvec,
 592         },
 593         {
 594                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 595                 .procname       = "printk_ratelimit",
 596                 .data           = &printk_ratelimit_jiffies,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = &proc_dointvec_jiffies,
 600                 .strategy       = &sysctl_jiffies,
 601         },
 602         {
 603                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 604                 .procname       = "printk_ratelimit_burst",
 605                 .data           = &printk_ratelimit_burst,
 606                 .maxlen         = sizeof(int),
 607                 .mode           = 0644,
 608                 .proc_handler   = &proc_dointvec,
 609         },
 610         {
 611                 .ctl_name       = KERN_NGROUPS_MAX,
 612                 .procname       = "ngroups_max",
 613                 .data           = &ngroups_max,
 614                 .maxlen         = sizeof (int),
 615                 .mode           = 0444,
 616                 .proc_handler   = &proc_dointvec,
 617         },
 618 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 619         {
 620                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 621                 .procname       = "unknown_nmi_panic",
 622                 .data           = &unknown_nmi_panic,
 623                 .maxlen         = sizeof (int),
 624                 .mode           = 0644,
 625                 .proc_handler   = &proc_unknown_nmi_panic,
 626         },
 627 #endif
 628 #if defined(CONFIG_X86)
 629         {
 630                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 631                 .procname       = "bootloader_type",
 632                 .data           = &bootloader_type,
 633                 .maxlen         = sizeof (int),
 634                 .mode           = 0444,
 635                 .proc_handler   = &proc_dointvec,
 636         },
 637 #endif
 638         {
 639                 .ctl_name       = KERN_RANDOMIZE,
 640                 .procname       = "randomize_va_space",
 641                 .data           = &randomize_va_space,
 642                 .maxlen         = sizeof(int),
 643                 .mode           = 0644,
 644                 .proc_handler   = &proc_dointvec,
 645         },
 646
 647         { .ctl_name = 0 }
 648 };
 649
 650 /* Constants for minimum and maximum testing in vm_table.
 651    We use these as one-element integer vectors. */
 652 static int zero;
 653 static int one_hundred = 100;
 654
 655
 656 static ctl_table vm_table[] = {
 657         {
 658                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 659                 .procname       = "overcommit_memory",
 660                 .data           = &sysctl_overcommit_memory,
 661                 .maxlen         = sizeof(sysctl_overcommit_memory),
 662                 .mode           = 0644,
 663                 .proc_handler   = &proc_dointvec,
 664         },
 665         {
 666                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 667                 .procname       = "overcommit_ratio",
 668                 .data           = &sysctl_overcommit_ratio,
 669                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 670                 .mode           = 0644,
 671                 .proc_handler   = &proc_dointvec,
 672         },
 673         {
 674                 .ctl_name       = VM_PAGE_CLUSTER,
 675                 .procname       = "page-cluster",
 676                 .data           = &page_cluster,
 677                 .maxlen         = sizeof(int),
 678                 .mode           = 0644,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681         {
 682                 .ctl_name       = VM_DIRTY_BACKGROUND,
 683                 .procname       = "dirty_background_ratio",
 684                 .data           = &dirty_background_ratio,
 685                 .maxlen         = sizeof(dirty_background_ratio),
 686                 .mode           = 0644,
 687                 .proc_handler   = &proc_dointvec_minmax,
 688                 .strategy       = &sysctl_intvec,
 689                 .extra1         = &zero,
 690                 .extra2         = &one_hundred,
 691         },
 692         {
 693                 .ctl_name       = VM_DIRTY_RATIO,
 694                 .procname       = "dirty_ratio",
 695                 .data           = &vm_dirty_ratio,
 696                 .maxlen         = sizeof(vm_dirty_ratio),
 697                 .mode           = 0644,
 698                 .proc_handler   = &proc_dointvec_minmax,
 699                 .strategy       = &sysctl_intvec,
 700                 .extra1         = &zero,
 701                 .extra2         = &one_hundred,
 702         },
 703         {
 704                 .ctl_name       = VM_DIRTY_WB_CS,
 705                 .procname       = "dirty_writeback_centisecs",
 706                 .data           = &dirty_writeback_centisecs,
 707                 .maxlen         = sizeof(dirty_writeback_centisecs),
 708                 .mode           = 0644,
 709                 .proc_handler   = &dirty_writeback_centisecs_handler,
 710         },
 711         {
 712                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
 713                 .procname       = "dirty_expire_centisecs",
 714                 .data           = &dirty_expire_centisecs,
 715                 .maxlen         = sizeof(dirty_expire_centisecs),
 716                 .mode           = 0644,
 717                 .proc_handler   = &proc_dointvec,
 718         },
 719         {
 720                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 721                 .procname       = "nr_pdflush_threads",
 722                 .data           = &nr_pdflush_threads,
 723                 .maxlen         = sizeof nr_pdflush_threads,
 724                 .mode           = 0444 /* read-only*/,
 725                 .proc_handler   = &proc_dointvec,
 726         },
 727         {
 728                 .ctl_name       = VM_SWAPPINESS,
 729                 .procname       = "swappiness",
 730                 .data           = &vm_swappiness,
 731                 .maxlen         = sizeof(vm_swappiness),
 732                 .mode           = 0644,
 733                 .proc_handler   = &proc_dointvec_minmax,
 734                 .strategy       = &sysctl_intvec,
 735                 .extra1         = &zero,
 736                 .extra2         = &one_hundred,
 737         },
 738 #ifdef CONFIG_HUGETLB_PAGE
 739          {
 740                 .ctl_name       = VM_HUGETLB_PAGES,
 741                 .procname       = "nr_hugepages",
 742                 .data           = &max_huge_pages,
 743                 .maxlen         = sizeof(unsigned long),
 744                 .mode           = 0644,
 745                 .proc_handler   = &hugetlb_sysctl_handler,
 746                 .extra1         = (void *)&hugetlb_zero,
 747                 .extra2         = (void *)&hugetlb_infinity,
 748          },
 749          {
 750                 .ctl_name       = VM_HUGETLB_GROUP,
 751                 .procname       = "hugetlb_shm_group",
 752                 .data           = &sysctl_hugetlb_shm_group,
 753                 .maxlen         = sizeof(gid_t),
 754                 .mode           = 0644,
 755                 .proc_handler   = &proc_dointvec,
 756          },
 757 #endif
 758         {
 759                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 760                 .procname       = "lowmem_reserve_ratio",
 761                 .data           = &sysctl_lowmem_reserve_ratio,
 762                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 763                 .mode           = 0644,
 764                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 765                 .strategy       = &sysctl_intvec,
 766         },
 767         {
 768                 .ctl_name       = VM_MIN_FREE_KBYTES,
 769                 .procname       = "min_free_kbytes",
 770                 .data           = &min_free_kbytes,
 771                 .maxlen         = sizeof(min_free_kbytes),
 772                 .mode           = 0644,
 773                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 774                 .strategy       = &sysctl_intvec,
 775                 .extra1         = &zero,
 776         },
 777 #ifdef CONFIG_MMU
 778         {
 779                 .ctl_name       = VM_MAX_MAP_COUNT,
 780                 .procname       = "max_map_count",
 781                 .data           = &sysctl_max_map_count,
 782                 .maxlen         = sizeof(sysctl_max_map_count),
 783                 .mode           = 0644,
 784                 .proc_handler   = &proc_dointvec
 785         },
 786 #endif
 787         {
 788                 .ctl_name       = VM_LAPTOP_MODE,
 789                 .procname       = "laptop_mode",
 790                 .data           = &laptop_mode,
 791                 .maxlen         = sizeof(laptop_mode),
 792                 .mode           = 0644,
 793                 .proc_handler   = &proc_dointvec,
 794                 .strategy       = &sysctl_intvec,
 795                 .extra1         = &zero,
 796         },
 797         {
 798                 .ctl_name       = VM_BLOCK_DUMP,
 799                 .procname       = "block_dump",
 800                 .data           = &block_dump,
 801                 .maxlen         = sizeof(block_dump),
 802                 .mode           = 0644,
 803                 .proc_handler   = &proc_dointvec,
 804                 .strategy       = &sysctl_intvec,
 805                 .extra1         = &zero,
 806         },
 807         {
 808                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 809                 .procname       = "vfs_cache_pressure",
 810                 .data           = &sysctl_vfs_cache_pressure,
 811                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 812                 .mode           = 0644,
 813                 .proc_handler   = &proc_dointvec,
 814                 .strategy       = &sysctl_intvec,
 815                 .extra1         = &zero,
 816         },
 817 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 818         {
 819                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 820                 .procname       = "legacy_va_layout",
 821                 .data           = &sysctl_legacy_va_layout,
 822                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 823                 .mode           = 0644,
 824                 .proc_handler   = &proc_dointvec,
 825                 .strategy       = &sysctl_intvec,
 826                 .extra1         = &zero,
 827         },
 828 #endif
 829 #ifdef CONFIG_SWAP
 830         {
 831                 .ctl_name       = VM_SWAP_TOKEN_TIMEOUT,
 832                 .procname       = "swap_token_timeout",
 833                 .data           = &swap_token_default_timeout,
 834                 .maxlen         = sizeof(swap_token_default_timeout),
 835                 .mode           = 0644,
 836                 .proc_handler   = &proc_dointvec_jiffies,
 837                 .strategy       = &sysctl_jiffies,
 838         },
 839 #endif
 840         { .ctl_name = 0 }
 841 };
 842
 843 static ctl_table proc_table[] = {
 844         { .ctl_name = 0 }
 845 };
 846
 847 static ctl_table fs_table[] = {
 848         {
 849                 .ctl_name       = FS_NRINODE,
 850                 .procname       = "inode-nr",
 851                 .data           = &inodes_stat,
 852                 .maxlen         = 2*sizeof(int),
 853                 .mode           = 0444,
 854                 .proc_handler   = &proc_dointvec,
 855         },
 856         {
 857                 .ctl_name       = FS_STATINODE,
 858                 .procname       = "inode-state",
 859                 .data           = &inodes_stat,
 860                 .maxlen         = 7*sizeof(int),
 861                 .mode           = 0444,
 862                 .proc_handler   = &proc_dointvec,
 863         },
 864         {
 865                 .ctl_name       = FS_NRFILE,
 866                 .procname       = "file-nr",
 867                 .data           = &files_stat,
 868                 .maxlen         = 3*sizeof(int),
 869                 .mode           = 0444,
 870                 .proc_handler   = &proc_dointvec,
 871         },
 872         {
 873                 .ctl_name       = FS_MAXFILE,
 874                 .procname       = "file-max",
 875                 .data           = &files_stat.max_files,
 876                 .maxlen         = sizeof(int),
 877                 .mode           = 0644,
 878                 .proc_handler   = &proc_dointvec,
 879         },
 880         {
 881                 .ctl_name       = FS_DENTRY,
 882                 .procname       = "dentry-state",
 883                 .data           = &dentry_stat,
 884                 .maxlen         = 6*sizeof(int),
 885                 .mode           = 0444,
 886                 .proc_handler   = &proc_dointvec,
 887         },
 888         {
 889                 .ctl_name       = FS_OVERFLOWUID,
 890                 .procname       = "overflowuid",
 891                 .data           = &fs_overflowuid,
 892                 .maxlen         = sizeof(int),
 893                 .mode           = 0644,
 894                 .proc_handler   = &proc_dointvec_minmax,
 895                 .strategy       = &sysctl_intvec,
 896                 .extra1         = &minolduid,
 897                 .extra2         = &maxolduid,
 898         },
 899         {
 900                 .ctl_name       = FS_OVERFLOWGID,
 901                 .procname       = "overflowgid",
 902                 .data           = &fs_overflowgid,
 903                 .maxlen         = sizeof(int),
 904                 .mode           = 0644,
 905                 .proc_handler   = &proc_dointvec_minmax,
 906                 .strategy       = &sysctl_intvec,
 907                 .extra1         = &minolduid,
 908                 .extra2         = &maxolduid,
 909         },
 910         {
 911                 .ctl_name       = FS_LEASES,
 912                 .procname       = "leases-enable",
 913                 .data           = &leases_enable,
 914                 .maxlen         = sizeof(int),
 915                 .mode           = 0644,
 916                 .proc_handler   = &proc_dointvec,
 917         },
 918 #ifdef CONFIG_DNOTIFY
 919         {
 920                 .ctl_name       = FS_DIR_NOTIFY,
 921                 .procname       = "dir-notify-enable",
 922                 .data           = &dir_notify_enable,
 923                 .maxlen         = sizeof(int),
 924                 .mode           = 0644,
 925                 .proc_handler   = &proc_dointvec,
 926         },
 927 #endif
 928 #ifdef CONFIG_MMU
 929         {
 930                 .ctl_name       = FS_LEASE_TIME,
 931                 .procname       = "lease-break-time",
 932                 .data           = &lease_break_time,
 933                 .maxlen         = sizeof(int),
 934                 .mode           = 0644,
 935                 .proc_handler   = &proc_dointvec,
 936         },
 937         {
 938                 .ctl_name       = FS_AIO_NR,
 939                 .procname       = "aio-nr",
 940                 .data           = &aio_nr,
 941                 .maxlen         = sizeof(aio_nr),
 942                 .mode           = 0444,
 943                 .proc_handler   = &proc_dointvec,
 944         },
 945         {
 946                 .ctl_name       = FS_AIO_MAX_NR,
 947                 .procname       = "aio-max-nr",
 948                 .data           = &aio_max_nr,
 949                 .maxlen         = sizeof(aio_max_nr),
 950                 .mode           = 0644,
 951                 .proc_handler   = &proc_dointvec,
 952         },
 953 #endif
 954         {
 955                 .ctl_name       = KERN_SETUID_DUMPABLE,
 956                 .procname       = "suid_dumpable",
 957                 .data           = &suid_dumpable,
 958                 .maxlen         = sizeof(int),
 959                 .mode           = 0644,
 960                 .proc_handler   = &proc_dointvec,
 961         },
 962         { .ctl_name = 0 }
 963 };
 964
 965 static ctl_table debug_table[] = {
 966         { .ctl_name = 0 }
 967 };
 968
 969 static ctl_table dev_table[] = {
 970         { .ctl_name = 0 }
 971 };
 972
 973 extern void init_irq_proc (void);
 974
 975 void __init sysctl_init(void)
 976 {
 977 #ifdef CONFIG_PROC_FS
 978         register_proc_table(root_table, proc_sys_root);
 979         init_irq_proc();
 980 #endif
 981 }
 982
 983 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
 984                void __user *newval, size_t newlen)
 985 {
 986         struct list_head *tmp;
 987
 988         if (nlen <= 0 || nlen >= CTL_MAXNAME)
 989                 return -ENOTDIR;
 990         if (oldval) {
 991                 int old_len;
 992                 if (!oldlenp || get_user(old_len, oldlenp))
 993                         return -EFAULT;
 994         }
 995         tmp = &root_table_header.ctl_entry;
 996         do {
 997                 struct ctl_table_header *head =
 998                         list_entry(tmp, struct ctl_table_header, ctl_entry);
 999                 void *context = NULL;
1000                 int error = parse_table(name, nlen, oldval, oldlenp,
1001                                         newval, newlen, head->ctl_table,
1002                                         &context);
1003                 kfree(context);
1004                 if (error != -ENOTDIR)
1005                         return error;
1006                 tmp = tmp->next;
1007         } while (tmp != &root_table_header.ctl_entry);
1008         return -ENOTDIR;
1009 }
1010
1011 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1012 {
1013         struct __sysctl_args tmp;
1014         int error;
1015
1016         if (copy_from_user(&tmp, args, sizeof(tmp)))
1017                 return -EFAULT;
1018
1019         lock_kernel();
1020         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1021                           tmp.newval, tmp.newlen);
1022         unlock_kernel();
1023         return error;
1024 }
1025
1026 /*
1027  * ctl_perm does NOT grant the superuser all rights automatically, because
1028  * some sysctl variables are readonly even to root.
1029  */
1030
1031 static int test_perm(int mode, int op)
1032 {
1033         if (!current->euid)
1034                 mode >>= 6;
1035         else if (in_egroup_p(0))
1036                 mode >>= 3;
1037         if ((mode & op & 0007) == op)
1038                 return 0;
1039         return -EACCES;
1040 }
1041
1042 static inline int ctl_perm(ctl_table *table, int op)
1043 {
1044         int error;
1045         error = security_sysctl(table, op);
1046         if (error)
1047                 return error;
1048         return test_perm(table->mode, op);
1049 }
1050
1051 static int parse_table(int __user *name, int nlen,
1052                        void __user *oldval, size_t __user *oldlenp,
1053                        void __user *newval, size_t newlen,
1054                        ctl_table *table, void **context)
1055 {
1056         int n;
1057 repeat:
1058         if (!nlen)
1059                 return -ENOTDIR;
1060         if (get_user(n, name))
1061                 return -EFAULT;
1062         for ( ; table->ctl_name; table++) {
1063                 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1064                         int error;
1065                         if (table->child) {
1066                                 if (ctl_perm(table, 001))
1067                                         return -EPERM;
1068                                 if (table->strategy) {
1069                                         error = table->strategy(
1070                                                 table, name, nlen,
1071                                                 oldval, oldlenp,
1072                                                 newval, newlen, context);
1073                                         if (error)
1074                                                 return error;
1075                                 }
1076                                 name++;
1077                                 nlen--;
1078                                 table = table->child;
1079                                 goto repeat;
1080                         }
1081                         error = do_sysctl_strategy(table, name, nlen,
1082                                                    oldval, oldlenp,
1083                                                    newval, newlen, context);
1084                         return error;
1085                 }
1086         }
1087         return -ENOTDIR;
1088 }
1089
1090 /* Perform the actual read/write of a sysctl table entry. */
1091 int do_sysctl_strategy (ctl_table *table,
1092                         int __user *name, int nlen,
1093                         void __user *oldval, size_t __user *oldlenp,
1094                         void __user *newval, size_t newlen, void **context)
1095 {
1096         int op = 0, rc;
1097         size_t len;
1098
1099         if (oldval)
1100                 op |= 004;
1101         if (newval)
1102                 op |= 002;
1103         if (ctl_perm(table, op))
1104                 return -EPERM;
1105
1106         if (table->strategy) {
1107                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1108                                      newval, newlen, context);
1109                 if (rc < 0)
1110                         return rc;
1111                 if (rc > 0)
1112                         return 0;
1113         }
1114
1115         /* If there is no strategy routine, or if the strategy returns
1116          * zero, proceed with automatic r/w */
1117         if (table->data && table->maxlen) {
1118                 if (oldval && oldlenp) {
1119                         if (get_user(len, oldlenp))
1120                                 return -EFAULT;
1121                         if (len) {
1122                                 if (len > table->maxlen)
1123                                         len = table->maxlen;
1124                                 if(copy_to_user(oldval, table->data, len))
1125                                         return -EFAULT;
1126                                 if(put_user(len, oldlenp))
1127                                         return -EFAULT;
1128                         }
1129                 }
1130                 if (newval && newlen) {
1131                         len = newlen;
1132                         if (len > table->maxlen)
1133                                 len = table->maxlen;
1134                         if(copy_from_user(table->data, newval, len))
1135                                 return -EFAULT;
1136                 }
1137         }
1138         return 0;
1139 }
1140
1141 /**
1142  * register_sysctl_table - register a sysctl hierarchy
1143  * @table: the top-level table structure
1144  * @insert_at_head: whether the entry should be inserted in front or at the end
1145  *
1146  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1147  * array. An entry with a ctl_name of 0 terminates the table.
1148  *
1149  * The members of the &ctl_table structure are used as follows:
1150  *
1151  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1152  *            must be unique within that level of sysctl
1153  *
1154  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1155  *            enter a sysctl file
1156  *
1157  * data - a pointer to data for use by proc_handler
1158  *
1159  * maxlen - the maximum size in bytes of the data
1160  *
1161  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1162  *
1163  * child - a pointer to the child sysctl table if this entry is a directory, or
1164  *         %NULL.
1165  *
1166  * proc_handler - the text handler routine (described below)
1167  *
1168  * strategy - the strategy routine (described below)
1169  *
1170  * de - for internal use by the sysctl routines
1171  *
1172  * extra1, extra2 - extra pointers usable by the proc handler routines
1173  *
1174  * Leaf nodes in the sysctl tree will be represented by a single file
1175  * under /proc; non-leaf nodes will be represented by directories.
1176  *
1177  * sysctl(2) can automatically manage read and write requests through
1178  * the sysctl table.  The data and maxlen fields of the ctl_table
1179  * struct enable minimal validation of the values being written to be
1180  * performed, and the mode field allows minimal authentication.
1181  *
1182  * More sophisticated management can be enabled by the provision of a
1183  * strategy routine with the table entry.  This will be called before
1184  * any automatic read or write of the data is performed.
1185  *
1186  * The strategy routine may return
1187  *
1188  * < 0 - Error occurred (error is passed to user process)
1189  *
1190  * 0   - OK - proceed with automatic read or write.
1191  *
1192  * > 0 - OK - read or write has been done by the strategy routine, so
1193  *       return immediately.
1194  *
1195  * There must be a proc_handler routine for any terminal nodes
1196  * mirrored under /proc/sys (non-terminals are handled by a built-in
1197  * directory handler).  Several default handlers are available to
1198  * cover common cases -
1199  *
1200  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1201  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1202  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1203  *
1204  * It is the handler's job to read the input buffer from user memory
1205  * and process it. The handler should return 0 on success.
1206  *
1207  * This routine returns %NULL on a failure to register, and a pointer
1208  * to the table header on success.
1209  */
1210 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1211                                                int insert_at_head)
1212 {
1213         struct ctl_table_header *tmp;
1214         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1215         if (!tmp)
1216                 return NULL;
1217         tmp->ctl_table = table;
1218         INIT_LIST_HEAD(&tmp->ctl_entry);
1219         if (insert_at_head)
1220                 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1221         else
1222                 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1223 #ifdef CONFIG_PROC_FS
1224         register_proc_table(table, proc_sys_root);
1225 #endif
1226         return tmp;
1227 }
1228
1229 /**
1230  * unregister_sysctl_table - unregister a sysctl table hierarchy
1231  * @header: the header returned from register_sysctl_table
1232  *
1233  * Unregisters the sysctl table and all children. proc entries may not
1234  * actually be removed until they are no longer used by anyone.
1235  */
1236 void unregister_sysctl_table(struct ctl_table_header * header)
1237 {
1238         list_del(&header->ctl_entry);
1239 #ifdef CONFIG_PROC_FS
1240         unregister_proc_table(header->ctl_table, proc_sys_root);
1241 #endif
1242         kfree(header);
1243 }
1244
1245 /*
1246  * /proc/sys support
1247  */
1248
1249 #ifdef CONFIG_PROC_FS
1250
1251 /* Scan the sysctl entries in table and add them all into /proc */
1252 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root)
1253 {
1254         struct proc_dir_entry *de;
1255         int len;
1256         mode_t mode;
1257
1258         for (; table->ctl_name; table++) {
1259                 /* Can't do anything without a proc name. */
1260                 if (!table->procname)
1261                         continue;
1262                 /* Maybe we can't do anything with it... */
1263                 if (!table->proc_handler && !table->child) {
1264                         printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1265                                 table->procname);
1266                         continue;
1267                 }
1268
1269                 len = strlen(table->procname);
1270                 mode = table->mode;
1271
1272                 de = NULL;
1273                 if (table->proc_handler)
1274                         mode |= S_IFREG;
1275                 else {
1276                         mode |= S_IFDIR;
1277                         for (de = root->subdir; de; de = de->next) {
1278                                 if (proc_match(len, table->procname, de))
1279                                         break;
1280                         }
1281                         /* If the subdir exists already, de is non-NULL */
1282                 }
1283
1284                 if (!de) {
1285                         de = create_proc_entry(table->procname, mode, root);
1286                         if (!de)
1287                                 continue;
1288                         de->data = (void *) table;
1289                         if (table->proc_handler)
1290                                 de->proc_fops = &proc_sys_file_operations;
1291                 }
1292                 table->de = de;
1293                 if (de->mode & S_IFDIR)
1294                         register_proc_table(table->child, de);
1295         }
1296 }
1297
1298 /*
1299  * Unregister a /proc sysctl table and any subdirectories.
1300  */
1301 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1302 {
1303         struct proc_dir_entry *de;
1304         for (; table->ctl_name; table++) {
1305                 if (!(de = table->de))
1306                         continue;
1307                 if (de->mode & S_IFDIR) {
1308                         if (!table->child) {
1309                                 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1310                                 continue;
1311                         }
1312                         unregister_proc_table(table->child, de);
1313
1314                         /* Don't unregister directories which still have entries.. */
1315                         if (de->subdir)
1316                                 continue;
1317                 }
1318
1319                 /* Don't unregister proc entries that are still being used.. */
1320                 if (atomic_read(&de->count))
1321                         continue;
1322
1323                 table->de = NULL;
1324                 remove_proc_entry(table->procname, root);
1325         }
1326 }
1327
1328 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1329                           size_t count, loff_t *ppos)
1330 {
1331         int op;
1332         struct proc_dir_entry *de;
1333         struct ctl_table *table;
1334         size_t res;
1335         ssize_t error;
1336
1337         de = PDE(file->f_dentry->d_inode);
1338         if (!de || !de->data)
1339                 return -ENOTDIR;
1340         table = (struct ctl_table *) de->data;
1341         if (!table || !table->proc_handler)
1342                 return -ENOTDIR;
1343         op = (write ? 002 : 004);
1344         if (ctl_perm(table, op))
1345                 return -EPERM;
1346
1347         res = count;
1348
1349         error = (*table->proc_handler) (table, write, file, buf, &res, ppos);
1350         if (error)
1351                 return error;
1352         return res;
1353 }
1354
1355 static int proc_opensys(struct inode *inode, struct file *file)
1356 {
1357         if (file->f_mode & FMODE_WRITE) {
1358                 /*
1359                  * sysctl entries that are not writable,
1360                  * are _NOT_ writable, capabilities or not.
1361                  */
1362                 if (!(inode->i_mode & S_IWUSR))
1363                         return -EPERM;
1364         }
1365
1366         return 0;
1367 }
1368
1369 static ssize_t proc_readsys(struct file * file, char __user * buf,
1370                             size_t count, loff_t *ppos)
1371 {
1372         return do_rw_proc(0, file, buf, count, ppos);
1373 }
1374
1375 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1376                              size_t count, loff_t *ppos)
1377 {
1378         return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1379 }
1380
1381 /**
1382  * proc_dostring - read a string sysctl
1383  * @table: the sysctl table
1384  * @write: %TRUE if this is a write to the sysctl file
1385  * @filp: the file structure
1386  * @buffer: the user buffer
1387  * @lenp: the size of the user buffer
1388  * @ppos: file position
1389  *
1390  * Reads/writes a string from/to the user buffer. If the kernel
1391  * buffer provided is not large enough to hold the string, the
1392  * string is truncated. The copied string is %NULL-terminated.
1393  * If the string is being read by the user process, it is copied
1394  * and a newline '\n' is added. It is truncated if the buffer is
1395  * not large enough.
1396  *
1397  * Returns 0 on success.
1398  */
1399 int proc_dostring(ctl_table *table, int write, struct file *filp,
1400                   void __user *buffer, size_t *lenp, loff_t *ppos)
1401 {
1402         size_t len;
1403         char __user *p;
1404         char c;
1405
1406         if (!table->data || !table->maxlen || !*lenp ||
1407             (*ppos && !write)) {
1408                 *lenp = 0;
1409                 return 0;
1410         }
1411
1412         if (write) {
1413                 len = 0;
1414                 p = buffer;
1415                 while (len < *lenp) {
1416                         if (get_user(c, p++))
1417                                 return -EFAULT;
1418                         if (c == 0 || c == '\n')
1419                                 break;
1420                         len++;
1421                 }
1422                 if (len >= table->maxlen)
1423                         len = table->maxlen-1;
1424                 if(copy_from_user(table->data, buffer, len))
1425                         return -EFAULT;
1426                 ((char *) table->data)[len] = 0;
1427                 *ppos += *lenp;
1428         } else {
1429                 len = strlen(table->data);
1430                 if (len > table->maxlen)
1431                         len = table->maxlen;
1432                 if (len > *lenp)
1433                         len = *lenp;
1434                 if (len)
1435                         if(copy_to_user(buffer, table->data, len))
1436                                 return -EFAULT;
1437                 if (len < *lenp) {
1438                         if(put_user('\n', ((char __user *) buffer) + len))
1439                                 return -EFAULT;
1440                         len++;
1441                 }
1442                 *lenp = len;
1443                 *ppos += len;
1444         }
1445         return 0;
1446 }
1447
1448 /*
1449  *      Special case of dostring for the UTS structure. This has locks
1450  *      to observe. Should this be in kernel/sys.c ????
1451  */
1452
1453 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1454                   void __user *buffer, size_t *lenp, loff_t *ppos)
1455 {
1456         int r;
1457
1458         if (!write) {
1459                 down_read(&uts_sem);
1460                 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1461                 up_read(&uts_sem);
1462         } else {
1463                 down_write(&uts_sem);
1464                 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1465                 up_write(&uts_sem);
1466         }
1467         return r;
1468 }
1469
1470 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1471                                  int *valp,
1472                                  int write, void *data)
1473 {
1474         if (write) {
1475                 *valp = *negp ? -*lvalp : *lvalp;
1476         } else {
1477                 int val = *valp;
1478                 if (val < 0) {
1479                         *negp = -1;
1480                         *lvalp = (unsigned long)-val;
1481                 } else {
1482                         *negp = 0;
1483                         *lvalp = (unsigned long)val;
1484                 }
1485         }
1486         return 0;
1487 }
1488
1489 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1490                   void __user *buffer, size_t *lenp, loff_t *ppos,
1491                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1492                               int write, void *data),
1493                   void *data)
1494 {
1495 #define TMPBUFLEN 21
1496         int *i, vleft, first=1, neg, val;
1497         unsigned long lval;
1498         size_t left, len;
1499
1500         char buf[TMPBUFLEN], *p;
1501         char __user *s = buffer;
1502
1503         if (!table->data || !table->maxlen || !*lenp ||
1504             (*ppos && !write)) {
1505                 *lenp = 0;
1506                 return 0;
1507         }
1508
1509         i = (int *) table->data;
1510         vleft = table->maxlen / sizeof(*i);
1511         left = *lenp;
1512
1513         if (!conv)
1514                 conv = do_proc_dointvec_conv;
1515
1516         for (; left && vleft--; i++, first=0) {
1517                 if (write) {
1518                         while (left) {
1519                                 char c;
1520                                 if (get_user(c, s))
1521                                         return -EFAULT;
1522                                 if (!isspace(c))
1523                                         break;
1524                                 left--;
1525                                 s++;
1526                         }
1527                         if (!left)
1528                                 break;
1529                         neg = 0;
1530                         len = left;
1531                         if (len > sizeof(buf) - 1)
1532                                 len = sizeof(buf) - 1;
1533                         if (copy_from_user(buf, s, len))
1534                                 return -EFAULT;
1535                         buf[len] = 0;
1536                         p = buf;
1537                         if (*p == '-' && left > 1) {
1538                                 neg = 1;
1539                                 left--, p++;
1540                         }
1541                         if (*p < '0' || *p > '9')
1542                                 break;
1543
1544                         lval = simple_strtoul(p, &p, 0);
1545
1546                         len = p-buf;
1547                         if ((len < left) && *p && !isspace(*p))
1548                                 break;
1549                         if (neg)
1550                                 val = -val;
1551                         s += len;
1552                         left -= len;
1553
1554                         if (conv(&neg, &lval, i, 1, data))
1555                                 break;
1556                 } else {
1557                         p = buf;
1558                         if (!first)
1559                                 *p++ = '\t';
1560
1561                         if (conv(&neg, &lval, i, 0, data))
1562                                 break;
1563
1564                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1565                         len = strlen(buf);
1566                         if (len > left)
1567                                 len = left;
1568                         if(copy_to_user(s, buf, len))
1569                                 return -EFAULT;
1570                         left -= len;
1571                         s += len;
1572                 }
1573         }
1574
1575         if (!write && !first && left) {
1576                 if(put_user('\n', s))
1577                         return -EFAULT;
1578                 left--, s++;
1579         }
1580         if (write) {
1581                 while (left) {
1582                         char c;
1583                         if (get_user(c, s++))
1584                                 return -EFAULT;
1585                         if (!isspace(c))
1586                                 break;
1587                         left--;
1588                 }
1589         }
1590         if (write && first)
1591                 return -EINVAL;
1592         *lenp -= left;
1593         *ppos += *lenp;
1594         return 0;
1595 #undef TMPBUFLEN
1596 }
1597
1598 /**
1599  * proc_dointvec - read a vector of integers
1600  * @table: the sysctl table
1601  * @write: %TRUE if this is a write to the sysctl file
1602  * @filp: the file structure
1603  * @buffer: the user buffer
1604  * @lenp: the size of the user buffer
1605  * @ppos: file position
1606  *
1607  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1608  * values from/to the user buffer, treated as an ASCII string.
1609  *
1610  * Returns 0 on success.
1611  */
1612 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1613                      void __user *buffer, size_t *lenp, loff_t *ppos)
1614 {
1615     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1616                             NULL,NULL);
1617 }
1618
1619 #define OP_SET  0
1620 #define OP_AND  1
1621 #define OP_OR   2
1622 #define OP_MAX  3
1623 #define OP_MIN  4
1624
1625 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1626                                       int *valp,
1627                                       int write, void *data)
1628 {
1629         int op = *(int *)data;
1630         if (write) {
1631                 int val = *negp ? -*lvalp : *lvalp;
1632                 switch(op) {
1633                 case OP_SET:    *valp = val; break;
1634                 case OP_AND:    *valp &= val; break;
1635                 case OP_OR:     *valp |= val; break;
1636                 case OP_MAX:    if(*valp < val)
1637                                         *valp = val;
1638                                 break;
1639                 case OP_MIN:    if(*valp > val)
1640                                 *valp = val;
1641                                 break;
1642                 }
1643         } else {
1644                 int val = *valp;
1645                 if (val < 0) {
1646                         *negp = -1;
1647                         *lvalp = (unsigned long)-val;
1648                 } else {
1649                         *negp = 0;
1650                         *lvalp = (unsigned long)val;
1651                 }
1652         }
1653         return 0;
1654 }
1655
1656 /*
1657  *      init may raise the set.
1658  */
1659
1660 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1661                         void __user *buffer, size_t *lenp, loff_t *ppos)
1662 {
1663         int op;
1664
1665         if (!capable(CAP_SYS_MODULE)) {
1666                 return -EPERM;
1667         }
1668
1669         op = (current->pid == 1) ? OP_SET : OP_AND;
1670         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1671                                 do_proc_dointvec_bset_conv,&op);
1672 }
1673
1674 struct do_proc_dointvec_minmax_conv_param {
1675         int *min;
1676         int *max;
1677 };
1678
1679 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1680                                         int *valp,
1681                                         int write, void *data)
1682 {
1683         struct do_proc_dointvec_minmax_conv_param *param = data;
1684         if (write) {
1685                 int val = *negp ? -*lvalp : *lvalp;
1686                 if ((param->min && *param->min > val) ||
1687                     (param->max && *param->max < val))
1688                         return -EINVAL;
1689                 *valp = val;
1690         } else {
1691                 int val = *valp;
1692                 if (val < 0) {
1693                         *negp = -1;
1694                         *lvalp = (unsigned long)-val;
1695                 } else {
1696                         *negp = 0;
1697                         *lvalp = (unsigned long)val;
1698                 }
1699         }
1700         return 0;
1701 }
1702
1703 /**
1704  * proc_dointvec_minmax - read a vector of integers with min/max values
1705  * @table: the sysctl table
1706  * @write: %TRUE if this is a write to the sysctl file
1707  * @filp: the file structure
1708  * @buffer: the user buffer
1709  * @lenp: the size of the user buffer
1710  * @ppos: file position
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  * @ppos: file position
1844  *
1845  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1846  * values from/to the user buffer, treated as an ASCII string.
1847  *
1848  * This routine will ensure the values are within the range specified by
1849  * table->extra1 (min) and table->extra2 (max).
1850  *
1851  * Returns 0 on success.
1852  */
1853 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1854                            void __user *buffer, size_t *lenp, loff_t *ppos)
1855 {
1856     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1857 }
1858
1859 /**
1860  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1861  * @table: the sysctl table
1862  * @write: %TRUE if this is a write to the sysctl file
1863  * @filp: the file structure
1864  * @buffer: the user buffer
1865  * @lenp: the size of the user buffer
1866  * @ppos: file position
1867  *
1868  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1869  * values from/to the user buffer, treated as an ASCII string. The values
1870  * are treated as milliseconds, and converted to jiffies when they are stored.
1871  *
1872  * This routine will ensure the values are within the range specified by
1873  * table->extra1 (min) and table->extra2 (max).
1874  *
1875  * Returns 0 on success.
1876  */
1877 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1878                                       struct file *filp,
1879                                       void __user *buffer,
1880                                       size_t *lenp, loff_t *ppos)
1881 {
1882     return do_proc_doulongvec_minmax(table, write, filp, buffer,
1883                                      lenp, ppos, HZ, 1000l);
1884 }
1885
1886
1887 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
1888                                          int *valp,
1889                                          int write, void *data)
1890 {
1891         if (write) {
1892                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1893         } else {
1894                 int val = *valp;
1895                 unsigned long lval;
1896                 if (val < 0) {
1897                         *negp = -1;
1898                         lval = (unsigned long)-val;
1899                 } else {
1900                         *negp = 0;
1901                         lval = (unsigned long)val;
1902                 }
1903                 *lvalp = lval / HZ;
1904         }
1905         return 0;
1906 }
1907
1908 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
1909                                                 int *valp,
1910                                                 int write, void *data)
1911 {
1912         if (write) {
1913                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1914         } else {
1915                 int val = *valp;
1916                 unsigned long lval;
1917                 if (val < 0) {
1918                         *negp = -1;
1919                         lval = (unsigned long)-val;
1920                 } else {
1921                         *negp = 0;
1922                         lval = (unsigned long)val;
1923                 }
1924                 *lvalp = jiffies_to_clock_t(lval);
1925         }
1926         return 0;
1927 }
1928
1929 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
1930                                             int *valp,
1931                                             int write, void *data)
1932 {
1933         if (write) {
1934                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1935         } else {
1936                 int val = *valp;
1937                 unsigned long lval;
1938                 if (val < 0) {
1939                         *negp = -1;
1940                         lval = (unsigned long)-val;
1941                 } else {
1942                         *negp = 0;
1943                         lval = (unsigned long)val;
1944                 }
1945                 *lvalp = jiffies_to_msecs(lval);
1946         }
1947         return 0;
1948 }
1949
1950 /**
1951  * proc_dointvec_jiffies - read a vector of integers as seconds
1952  * @table: the sysctl table
1953  * @write: %TRUE if this is a write to the sysctl file
1954  * @filp: the file structure
1955  * @buffer: the user buffer
1956  * @lenp: the size of the user buffer
1957  * @ppos: file position
1958  *
1959  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1960  * values from/to the user buffer, treated as an ASCII string.
1961  * The values read are assumed to be in seconds, and are converted into
1962  * jiffies.
1963  *
1964  * Returns 0 on success.
1965  */
1966 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
1967                           void __user *buffer, size_t *lenp, loff_t *ppos)
1968 {
1969     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1970                             do_proc_dointvec_jiffies_conv,NULL);
1971 }
1972
1973 /**
1974  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1975  * @table: the sysctl table
1976  * @write: %TRUE if this is a write to the sysctl file
1977  * @filp: the file structure
1978  * @buffer: the user buffer
1979  * @lenp: the size of the user buffer
1980  *
1981  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1982  * values from/to the user buffer, treated as an ASCII string.
1983  * The values read are assumed to be in 1/USER_HZ seconds, and
1984  * are converted into jiffies.
1985  *
1986  * Returns 0 on success.
1987  */
1988 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
1989                                  void __user *buffer, size_t *lenp, loff_t *ppos)
1990 {
1991     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1992                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1993 }
1994
1995 /**
1996  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1997  * @table: the sysctl table
1998  * @write: %TRUE if this is a write to the sysctl file
1999  * @filp: the file structure
2000  * @buffer: the user buffer
2001  * @lenp: the size of the user buffer
2002  * @ppos: file position
2003  * @ppos: the current position in the file
2004  *
2005  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2006  * values from/to the user buffer, treated as an ASCII string.
2007  * The values read are assumed to be in 1/1000 seconds, and
2008  * are converted into jiffies.
2009  *
2010  * Returns 0 on success.
2011  */
2012 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2013                              void __user *buffer, size_t *lenp, loff_t *ppos)
2014 {
2015         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2016                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2017 }
2018
2019 #else /* CONFIG_PROC_FS */
2020
2021 int proc_dostring(ctl_table *table, int write, struct file *filp,
2022                   void __user *buffer, size_t *lenp, loff_t *ppos)
2023 {
2024         return -ENOSYS;
2025 }
2026
2027 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2028                             void __user *buffer, size_t *lenp, loff_t *ppos)
2029 {
2030         return -ENOSYS;
2031 }
2032
2033 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2034                   void __user *buffer, size_t *lenp, loff_t *ppos)
2035 {
2036         return -ENOSYS;
2037 }
2038
2039 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2040                         void __user *buffer, size_t *lenp, loff_t *ppos)
2041 {
2042         return -ENOSYS;
2043 }
2044
2045 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2046                     void __user *buffer, size_t *lenp, loff_t *ppos)
2047 {
2048         return -ENOSYS;
2049 }
2050
2051 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2052                     void __user *buffer, size_t *lenp, loff_t *ppos)
2053 {
2054         return -ENOSYS;
2055 }
2056
2057 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2058                     void __user *buffer, size_t *lenp, loff_t *ppos)
2059 {
2060         return -ENOSYS;
2061 }
2062
2063 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2064                              void __user *buffer, size_t *lenp, loff_t *ppos)
2065 {
2066         return -ENOSYS;
2067 }
2068
2069 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2070                     void __user *buffer, size_t *lenp, loff_t *ppos)
2071 {
2072         return -ENOSYS;
2073 }
2074
2075 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2076                                       struct file *filp,
2077                                       void __user *buffer,
2078                                       size_t *lenp, loff_t *ppos)
2079 {
2080     return -ENOSYS;
2081 }
2082
2083
2084 #endif /* CONFIG_PROC_FS */
2085
2086
2087 /*
2088  * General sysctl support routines
2089  */
2090
2091 /* The generic string strategy routine: */
2092 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2093                   void __user *oldval, size_t __user *oldlenp,
2094                   void __user *newval, size_t newlen, void **context)
2095 {
2096         size_t l, len;
2097
2098         if (!table->data || !table->maxlen)
2099                 return -ENOTDIR;
2100
2101         if (oldval && oldlenp) {
2102                 if (get_user(len, oldlenp))
2103                         return -EFAULT;
2104                 if (len) {
2105                         l = strlen(table->data);
2106                         if (len > l) len = l;
2107                         if (len >= table->maxlen)
2108                                 len = table->maxlen;
2109                         if(copy_to_user(oldval, table->data, len))
2110                                 return -EFAULT;
2111                         if(put_user(0, ((char __user *) oldval) + len))
2112                                 return -EFAULT;
2113                         if(put_user(len, oldlenp))
2114                                 return -EFAULT;
2115                 }
2116         }
2117         if (newval && newlen) {
2118                 len = newlen;
2119                 if (len > table->maxlen)
2120                         len = table->maxlen;
2121                 if(copy_from_user(table->data, newval, len))
2122                         return -EFAULT;
2123                 if (len == table->maxlen)
2124                         len--;
2125                 ((char *) table->data)[len] = 0;
2126         }
2127         return 0;
2128 }
2129
2130 /*
2131  * This function makes sure that all of the integers in the vector
2132  * are between the minimum and maximum values given in the arrays
2133  * table->extra1 and table->extra2, respectively.
2134  */
2135 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2136                 void __user *oldval, size_t __user *oldlenp,
2137                 void __user *newval, size_t newlen, void **context)
2138 {
2139
2140         if (newval && newlen) {
2141                 int __user *vec = (int __user *) newval;
2142                 int *min = (int *) table->extra1;
2143                 int *max = (int *) table->extra2;
2144                 size_t length;
2145                 int i;
2146
2147                 if (newlen % sizeof(int) != 0)
2148                         return -EINVAL;
2149
2150                 if (!table->extra1 && !table->extra2)
2151                         return 0;
2152
2153                 if (newlen > table->maxlen)
2154                         newlen = table->maxlen;
2155                 length = newlen / sizeof(int);
2156
2157                 for (i = 0; i < length; i++) {
2158                         int value;
2159                         if (get_user(value, vec + i))
2160                                 return -EFAULT;
2161                         if (min && value < min[i])
2162                                 return -EINVAL;
2163                         if (max && value > max[i])
2164                                 return -EINVAL;
2165                 }
2166         }
2167         return 0;
2168 }
2169
2170 /* Strategy function to convert jiffies to seconds */
2171 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2172                 void __user *oldval, size_t __user *oldlenp,
2173                 void __user *newval, size_t newlen, void **context)
2174 {
2175         if (oldval) {
2176                 size_t olen;
2177                 if (oldlenp) {
2178                         if (get_user(olen, oldlenp))
2179                                 return -EFAULT;
2180                         if (olen!=sizeof(int))
2181                                 return -EINVAL;
2182                 }
2183                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2184                     (oldlenp && put_user(sizeof(int),oldlenp)))
2185                         return -EFAULT;
2186         }
2187         if (newval && newlen) {
2188                 int new;
2189                 if (newlen != sizeof(int))
2190                         return -EINVAL;
2191                 if (get_user(new, (int __user *)newval))
2192                         return -EFAULT;
2193                 *(int *)(table->data) = new*HZ;
2194         }
2195         return 1;
2196 }
2197
2198 /* Strategy function to convert jiffies to seconds */
2199 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2200                 void __user *oldval, size_t __user *oldlenp,
2201                 void __user *newval, size_t newlen, void **context)
2202 {
2203         if (oldval) {
2204                 size_t olen;
2205                 if (oldlenp) {
2206                         if (get_user(olen, oldlenp))
2207                                 return -EFAULT;
2208                         if (olen!=sizeof(int))
2209                                 return -EINVAL;
2210                 }
2211                 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2212                     (oldlenp && put_user(sizeof(int),oldlenp)))
2213                         return -EFAULT;
2214         }
2215         if (newval && newlen) {
2216                 int new;
2217                 if (newlen != sizeof(int))
2218                         return -EINVAL;
2219                 if (get_user(new, (int __user *)newval))
2220                         return -EFAULT;
2221                 *(int *)(table->data) = msecs_to_jiffies(new);
2222         }
2223         return 1;
2224 }
2225
2226 #else /* CONFIG_SYSCTL */
2227
2228
2229 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2230 {
2231         return -ENOSYS;
2232 }
2233
2234 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2235                   void __user *oldval, size_t __user *oldlenp,
2236                   void __user *newval, size_t newlen, void **context)
2237 {
2238         return -ENOSYS;
2239 }
2240
2241 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2242                 void __user *oldval, size_t __user *oldlenp,
2243                 void __user *newval, size_t newlen, void **context)
2244 {
2245         return -ENOSYS;
2246 }
2247
2248 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2249                 void __user *oldval, size_t __user *oldlenp,
2250                 void __user *newval, size_t newlen, void **context)
2251 {
2252         return -ENOSYS;
2253 }
2254
2255 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2256                 void __user *oldval, size_t __user *oldlenp,
2257                 void __user *newval, size_t newlen, void **context)
2258 {
2259         return -ENOSYS;
2260 }
2261
2262 int proc_dostring(ctl_table *table, int write, struct file *filp,
2263                   void __user *buffer, size_t *lenp, loff_t *ppos)
2264 {
2265         return -ENOSYS;
2266 }
2267
2268 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2269                   void __user *buffer, size_t *lenp, loff_t *ppos)
2270 {
2271         return -ENOSYS;
2272 }
2273
2274 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2275                         void __user *buffer, size_t *lenp, loff_t *ppos)
2276 {
2277         return -ENOSYS;
2278 }
2279
2280 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2281                     void __user *buffer, size_t *lenp, loff_t *ppos)
2282 {
2283         return -ENOSYS;
2284 }
2285
2286 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2287                           void __user *buffer, size_t *lenp, loff_t *ppos)
2288 {
2289         return -ENOSYS;
2290 }
2291
2292 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2293                           void __user *buffer, size_t *lenp, loff_t *ppos)
2294 {
2295         return -ENOSYS;
2296 }
2297
2298 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2299                              void __user *buffer, size_t *lenp, loff_t *ppos)
2300 {
2301         return -ENOSYS;
2302 }
2303
2304 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2305                     void __user *buffer, size_t *lenp, loff_t *ppos)
2306 {
2307         return -ENOSYS;
2308 }
2309
2310 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2311                                       struct file *filp,
2312                                       void __user *buffer,
2313                                       size_t *lenp, loff_t *ppos)
2314 {
2315     return -ENOSYS;
2316 }
2317
2318 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2319                                                 int insert_at_head)
2320 {
2321         return NULL;
2322 }
2323
2324 void unregister_sysctl_table(struct ctl_table_header * table)
2325 {
2326 }
2327
2328 #endif /* CONFIG_SYSCTL */
2329
2330 /*
2331  * No sense putting this after each symbol definition, twice,
2332  * exception granted :-)
2333  */
2334 EXPORT_SYMBOL(proc_dointvec);
2335 EXPORT_SYMBOL(proc_dointvec_jiffies);
2336 EXPORT_SYMBOL(proc_dointvec_minmax);
2337 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2338 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2339 EXPORT_SYMBOL(proc_dostring);
2340 EXPORT_SYMBOL(proc_doulongvec_minmax);
2341 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2342 EXPORT_SYMBOL(register_sysctl_table);
2343 EXPORT_SYMBOL(sysctl_intvec);
2344 EXPORT_SYMBOL(sysctl_jiffies);
2345 EXPORT_SYMBOL(sysctl_ms_jiffies);
2346 EXPORT_SYMBOL(sysctl_string);
2347 EXPORT_SYMBOL(unregister_sysctl_table);