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 panic_timeout;
  56 extern int C_A_D;
  57 extern int sysctl_overcommit_memory;
  58 extern int sysctl_overcommit_ratio;
  59 extern int max_threads;
  60 extern int sysrq_enabled;
  61 extern int core_uses_pid;
  62 extern int suid_dumpable;
  63 extern char core_pattern[];
  64 extern int cad_pid;
  65 extern int pid_max;
  66 extern int sysctl_lower_zone_protection;
  67 extern int min_free_kbytes;
  68 extern int printk_ratelimit_jiffies;
  69 extern int printk_ratelimit_burst;
  70 extern int pid_max_min, pid_max_max;
  71
  72 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
  73 int unknown_nmi_panic;
  74 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
  75                                   void __user *, size_t *, loff_t *);
  76 #endif
  77
  78 extern unsigned int vdso_enabled;
  79
  80 int exec_shield = 1;
  81 int exec_shield_randomize = 1;
  82
  83 static int __init setup_exec_shield(char *str)
  84 {
  85         get_option (&str, &exec_shield);
  86
  87         return 1;
  88 }
  89
  90 __setup("exec-shield=", setup_exec_shield);
  91
  92 static int __init setup_exec_shield_randomize(char *str)
  93 {
  94         get_option (&str, &exec_shield_randomize);
  95
  96         return 1;
  97 }
  98
  99 __setup("exec-shield-randomize=", setup_exec_shield_randomize);
 100
 101 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 102 static int maxolduid = 65535;
 103 static int minolduid;
 104
 105 static int ngroups_max = NGROUPS_MAX;
 106
 107 #ifdef CONFIG_KMOD
 108 extern char modprobe_path[];
 109 #endif
 110 #ifdef CONFIG_HOTPLUG
 111 extern char hotplug_path[];
 112 #endif
 113 extern char vshelper_path[];
 114 #ifdef CONFIG_CHR_DEV_SG
 115 extern int sg_big_buff;
 116 #endif
 117 #ifdef CONFIG_SYSVIPC
 118 extern size_t shm_ctlmax;
 119 extern size_t shm_ctlall;
 120 extern int shm_ctlmni;
 121 extern int msg_ctlmax;
 122 extern int msg_ctlmnb;
 123 extern int msg_ctlmni;
 124 extern int sem_ctls[];
 125 #endif
 126
 127 #ifdef __sparc__
 128 extern char reboot_command [];
 129 extern int stop_a_enabled;
 130 extern int scons_pwroff;
 131 #endif
 132
 133 #ifdef __hppa__
 134 extern int pwrsw_enabled;
 135 extern int unaligned_enabled;
 136 #endif
 137
 138 #ifdef CONFIG_ARCH_S390
 139 #ifdef CONFIG_MATHEMU
 140 extern int sysctl_ieee_emulation_warnings;
 141 #endif
 142 extern int sysctl_userprocess_debug;
 143 #endif
 144
 145 extern int sysctl_hz_timer;
 146
 147 #ifdef CONFIG_BSD_PROCESS_ACCT
 148 extern int acct_parm[];
 149 #endif
 150
 151 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
 152                        ctl_table *, void **);
 153 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
 154                   void __user *buffer, size_t *lenp, loff_t *ppos);
 155
 156 static ctl_table root_table[];
 157 static struct ctl_table_header root_table_header =
 158         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 159
 160 static ctl_table kern_table[];
 161 static ctl_table vm_table[];
 162 #ifdef CONFIG_NET
 163 extern ctl_table net_table[];
 164 #endif
 165 static ctl_table proc_table[];
 166 static ctl_table fs_table[];
 167 static ctl_table debug_table[];
 168 static ctl_table dev_table[];
 169 extern ctl_table random_table[];
 170 #ifdef CONFIG_UNIX98_PTYS
 171 extern ctl_table pty_table[];
 172 #endif
 173
 174 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 175 int sysctl_legacy_va_layout;
 176 #endif
 177
 178 /* /proc declarations: */
 179
 180 #ifdef CONFIG_PROC_FS
 181
 182 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
 183 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
 184 static int proc_opensys(struct inode *, struct file *);
 185
 186 struct file_operations proc_sys_file_operations = {
 187         .open           = proc_opensys,
 188         .read           = proc_readsys,
 189         .write          = proc_writesys,
 190 };
 191
 192 extern struct proc_dir_entry *proc_sys_root;
 193
 194 static void register_proc_table(ctl_table *, struct proc_dir_entry *);
 195 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
 196 #endif
 197
 198 /* The default sysctl tables: */
 199
 200 static ctl_table root_table[] = {
 201         {
 202                 .ctl_name       = CTL_KERN,
 203                 .procname       = "kernel",
 204                 .mode           = 0555,
 205                 .child          = kern_table,
 206         },
 207         {
 208                 .ctl_name       = CTL_VM,
 209                 .procname       = "vm",
 210                 .mode           = 0555,
 211                 .child          = vm_table,
 212         },
 213 #ifdef CONFIG_NET
 214         {
 215                 .ctl_name       = CTL_NET,
 216                 .procname       = "net",
 217                 .mode           = 0555,
 218                 .child          = net_table,
 219         },
 220 #endif
 221         {
 222                 .ctl_name       = CTL_PROC,
 223                 .procname       = "proc",
 224                 .mode           = 0555,
 225                 .child          = proc_table,
 226         },
 227         {
 228                 .ctl_name       = CTL_FS,
 229                 .procname       = "fs",
 230                 .mode           = 0555,
 231                 .child          = fs_table,
 232         },
 233         {
 234                 .ctl_name       = CTL_DEBUG,
 235                 .procname       = "debug",
 236                 .mode           = 0555,
 237                 .child          = debug_table,
 238         },
 239         {
 240                 .ctl_name       = CTL_DEV,
 241                 .procname       = "dev",
 242                 .mode           = 0555,
 243                 .child          = dev_table,
 244         },
 245         { .ctl_name = 0 }
 246 };
 247
 248 static ctl_table kern_table[] = {
 249         {
 250                 .ctl_name       = KERN_OSTYPE,
 251                 .procname       = "ostype",
 252                 .data           = system_utsname.sysname,
 253                 .maxlen         = sizeof(system_utsname.sysname),
 254                 .mode           = 0444,
 255                 .proc_handler   = &proc_doutsstring,
 256                 .strategy       = &sysctl_string,
 257         },
 258         {
 259                 .ctl_name       = KERN_OSRELEASE,
 260                 .procname       = "osrelease",
 261                 .data           = system_utsname.release,
 262                 .maxlen         = sizeof(system_utsname.release),
 263                 .mode           = 0444,
 264                 .proc_handler   = &proc_doutsstring,
 265                 .strategy       = &sysctl_string,
 266         },
 267         {
 268                 .ctl_name       = KERN_VERSION,
 269                 .procname       = "version",
 270                 .data           = system_utsname.version,
 271                 .maxlen         = sizeof(system_utsname.version),
 272                 .mode           = 0444,
 273                 .proc_handler   = &proc_doutsstring,
 274                 .strategy       = &sysctl_string,
 275         },
 276         {
 277                 .ctl_name       = KERN_NODENAME,
 278                 .procname       = "hostname",
 279                 .data           = system_utsname.nodename,
 280                 .maxlen         = sizeof(system_utsname.nodename),
 281                 .mode           = 0644,
 282                 .proc_handler   = &proc_doutsstring,
 283                 .strategy       = &sysctl_string,
 284         },
 285         {
 286                 .ctl_name       = KERN_DOMAINNAME,
 287                 .procname       = "domainname",
 288                 .data           = system_utsname.domainname,
 289                 .maxlen         = sizeof(system_utsname.domainname),
 290                 .mode           = 0644,
 291                 .proc_handler   = &proc_doutsstring,
 292                 .strategy       = &sysctl_string,
 293         },
 294         {
 295                 .ctl_name       = KERN_PANIC,
 296                 .procname       = "panic",
 297                 .data           = &panic_timeout,
 298                 .maxlen         = sizeof(int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec,
 301         },
 302         {
 303                 .ctl_name       = KERN_PANIC,
 304                 .procname       = "exec-shield",
 305                 .data           = &exec_shield,
 306                 .maxlen         = sizeof(int),
 307                 .mode           = 0644,
 308                 .proc_handler   = &proc_dointvec,
 309         },
 310         {
 311                 .ctl_name       = KERN_PANIC,
 312                 .procname       = "exec-shield-randomize",
 313                 .data           = &exec_shield_randomize,
 314                 .maxlen         = sizeof(int),
 315                 .mode           = 0644,
 316                 .proc_handler   = &proc_dointvec,
 317         },
 318         {
 319                 .ctl_name       = KERN_PANIC,
 320                 .procname       = "print-fatal-signals",
 321                 .data           = &print_fatal_signals,
 322                 .maxlen         = sizeof(int),
 323                 .mode           = 0644,
 324                 .proc_handler   = &proc_dointvec,
 325         },
 326 #if __i386__
 327         {
 328                 .ctl_name       = KERN_PANIC,
 329                 .procname       = "vdso",
 330                 .data           = &vdso_enabled,
 331                 .maxlen         = sizeof(int),
 332                 .mode           = 0644,
 333                 .proc_handler   = &proc_dointvec,
 334         },
 335 #endif
 336         {
 337                 .ctl_name       = KERN_CORE_USES_PID,
 338                 .procname       = "core_uses_pid",
 339                 .data           = &core_uses_pid,
 340                 .maxlen         = sizeof(int),
 341                 .mode           = 0644,
 342                 .proc_handler   = &proc_dointvec,
 343         },
 344         {
 345                 .ctl_name       = KERN_CORE_PATTERN,
 346                 .procname       = "core_pattern",
 347                 .data           = core_pattern,
 348                 .maxlen         = 64,
 349                 .mode           = 0644,
 350                 .proc_handler   = &proc_dostring,
 351                 .strategy       = &sysctl_string,
 352         },
 353         {
 354                 .ctl_name       = KERN_TAINTED,
 355                 .procname       = "tainted",
 356                 .data           = &tainted,
 357                 .maxlen         = sizeof(int),
 358                 .mode           = 0444,
 359                 .proc_handler   = &proc_dointvec,
 360         },
 361         {
 362                 .ctl_name       = KERN_CAP_BSET,
 363                 .procname       = "cap-bound",
 364                 .data           = &cap_bset,
 365                 .maxlen         = sizeof(kernel_cap_t),
 366                 .mode           = 0600,
 367                 .proc_handler   = &proc_dointvec_bset,
 368         },
 369 #ifdef CONFIG_BLK_DEV_INITRD
 370         {
 371                 .ctl_name       = KERN_REALROOTDEV,
 372                 .procname       = "real-root-dev",
 373                 .data           = &real_root_dev,
 374                 .maxlen         = sizeof(int),
 375                 .mode           = 0644,
 376                 .proc_handler   = &proc_dointvec,
 377         },
 378 #endif
 379 #ifdef __sparc__
 380         {
 381                 .ctl_name       = KERN_SPARC_REBOOT,
 382                 .procname       = "reboot-cmd",
 383                 .data           = reboot_command,
 384                 .maxlen         = 256,
 385                 .mode           = 0644,
 386                 .proc_handler   = &proc_dostring,
 387                 .strategy       = &sysctl_string,
 388         },
 389         {
 390                 .ctl_name       = KERN_SPARC_STOP_A,
 391                 .procname       = "stop-a",
 392                 .data           = &stop_a_enabled,
 393                 .maxlen         = sizeof (int),
 394                 .mode           = 0644,
 395                 .proc_handler   = &proc_dointvec,
 396         },
 397         {
 398                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 399                 .procname       = "scons-poweroff",
 400                 .data           = &scons_pwroff,
 401                 .maxlen         = sizeof (int),
 402                 .mode           = 0644,
 403                 .proc_handler   = &proc_dointvec,
 404         },
 405 #endif
 406 #ifdef __hppa__
 407         {
 408                 .ctl_name       = KERN_HPPA_PWRSW,
 409                 .procname       = "soft-power",
 410                 .data           = &pwrsw_enabled,
 411                 .maxlen         = sizeof (int),
 412                 .mode           = 0644,
 413                 .proc_handler   = &proc_dointvec,
 414         },
 415         {
 416                 .ctl_name       = KERN_HPPA_UNALIGNED,
 417                 .procname       = "unaligned-trap",
 418                 .data           = &unaligned_enabled,
 419                 .maxlen         = sizeof (int),
 420                 .mode           = 0644,
 421                 .proc_handler   = &proc_dointvec,
 422         },
 423 #endif
 424         {
 425                 .ctl_name       = KERN_CTLALTDEL,
 426                 .procname       = "ctrl-alt-del",
 427                 .data           = &C_A_D,
 428                 .maxlen         = sizeof(int),
 429                 .mode           = 0644,
 430                 .proc_handler   = &proc_dointvec,
 431         },
 432         {
 433                 .ctl_name       = KERN_PRINTK,
 434                 .procname       = "printk",
 435                 .data           = &console_loglevel,
 436                 .maxlen         = 4*sizeof(int),
 437                 .mode           = 0644,
 438                 .proc_handler   = &proc_dointvec,
 439         },
 440 #ifdef CONFIG_KMOD
 441         {
 442                 .ctl_name       = KERN_MODPROBE,
 443                 .procname       = "modprobe",
 444                 .data           = &modprobe_path,
 445                 .maxlen         = KMOD_PATH_LEN,
 446                 .mode           = 0644,
 447                 .proc_handler   = &proc_dostring,
 448                 .strategy       = &sysctl_string,
 449         },
 450 #endif
 451 #ifdef CONFIG_HOTPLUG
 452         {
 453                 .ctl_name       = KERN_HOTPLUG,
 454                 .procname       = "hotplug",
 455                 .data           = &hotplug_path,
 456                 .maxlen         = HOTPLUG_PATH_LEN,
 457                 .mode           = 0644,
 458                 .proc_handler   = &proc_dostring,
 459                 .strategy       = &sysctl_string,
 460         },
 461 #endif
 462         {
 463                 .ctl_name       = KERN_VSHELPER,
 464                 .procname       = "vshelper",
 465                 .data           = &vshelper_path,
 466                 .maxlen         = 256,
 467                 .mode           = 0644,
 468                 .proc_handler   = &proc_dostring,
 469                 .strategy       = &sysctl_string,
 470         },
 471 #ifdef CONFIG_CHR_DEV_SG
 472         {
 473                 .ctl_name       = KERN_SG_BIG_BUFF,
 474                 .procname       = "sg-big-buff",
 475                 .data           = &sg_big_buff,
 476                 .maxlen         = sizeof (int),
 477                 .mode           = 0444,
 478                 .proc_handler   = &proc_dointvec,
 479         },
 480 #endif
 481 #ifdef CONFIG_BSD_PROCESS_ACCT
 482         {
 483                 .ctl_name       = KERN_ACCT,
 484                 .procname       = "acct",
 485                 .data           = &acct_parm,
 486                 .maxlen         = 3*sizeof(int),
 487                 .mode           = 0644,
 488                 .proc_handler   = &proc_dointvec,
 489         },
 490 #endif
 491 #ifdef CONFIG_SYSVIPC
 492         {
 493                 .ctl_name       = KERN_SHMMAX,
 494                 .procname       = "shmmax",
 495                 .data           = &shm_ctlmax,
 496                 .maxlen         = sizeof (size_t),
 497                 .mode           = 0644,
 498                 .proc_handler   = &proc_doulongvec_minmax,
 499         },
 500         {
 501                 .ctl_name       = KERN_SHMALL,
 502                 .procname       = "shmall",
 503                 .data           = &shm_ctlall,
 504                 .maxlen         = sizeof (size_t),
 505                 .mode           = 0644,
 506                 .proc_handler   = &proc_doulongvec_minmax,
 507         },
 508         {
 509                 .ctl_name       = KERN_SHMMNI,
 510                 .procname       = "shmmni",
 511                 .data           = &shm_ctlmni,
 512                 .maxlen         = sizeof (int),
 513                 .mode           = 0644,
 514                 .proc_handler   = &proc_dointvec,
 515         },
 516         {
 517                 .ctl_name       = KERN_MSGMAX,
 518                 .procname       = "msgmax",
 519                 .data           = &msg_ctlmax,
 520                 .maxlen         = sizeof (int),
 521                 .mode           = 0644,
 522                 .proc_handler   = &proc_dointvec,
 523         },
 524         {
 525                 .ctl_name       = KERN_MSGMNI,
 526                 .procname       = "msgmni",
 527                 .data           = &msg_ctlmni,
 528                 .maxlen         = sizeof (int),
 529                 .mode           = 0644,
 530                 .proc_handler   = &proc_dointvec,
 531         },
 532         {
 533                 .ctl_name       = KERN_MSGMNB,
 534                 .procname       =  "msgmnb",
 535                 .data           = &msg_ctlmnb,
 536                 .maxlen         = sizeof (int),
 537                 .mode           = 0644,
 538                 .proc_handler   = &proc_dointvec,
 539         },
 540         {
 541                 .ctl_name       = KERN_SEM,
 542                 .procname       = "sem",
 543                 .data           = &sem_ctls,
 544                 .maxlen         = 4*sizeof (int),
 545                 .mode           = 0644,
 546                 .proc_handler   = &proc_dointvec,
 547         },
 548 #endif
 549 #ifdef CONFIG_MAGIC_SYSRQ
 550         {
 551                 .ctl_name       = KERN_SYSRQ,
 552                 .procname       = "sysrq",
 553                 .data           = &sysrq_enabled,
 554                 .maxlen         = sizeof (int),
 555                 .mode           = 0644,
 556                 .proc_handler   = &proc_dointvec,
 557         },
 558 #endif
 559         {
 560                 .ctl_name       = KERN_CADPID,
 561                 .procname       = "cad_pid",
 562                 .data           = &cad_pid,
 563                 .maxlen         = sizeof (int),
 564                 .mode           = 0600,
 565                 .proc_handler   = &proc_dointvec,
 566         },
 567         {
 568                 .ctl_name       = KERN_MAX_THREADS,
 569                 .procname       = "threads-max",
 570                 .data           = &max_threads,
 571                 .maxlen         = sizeof(int),
 572                 .mode           = 0644,
 573                 .proc_handler   = &proc_dointvec,
 574         },
 575         {
 576                 .ctl_name       = KERN_RANDOM,
 577                 .procname       = "random",
 578                 .mode           = 0555,
 579                 .child          = random_table,
 580         },
 581 #ifdef CONFIG_UNIX98_PTYS
 582         {
 583                 .ctl_name       = KERN_PTY,
 584                 .procname       = "pty",
 585                 .mode           = 0555,
 586                 .child          = pty_table,
 587         },
 588 #endif
 589         {
 590                 .ctl_name       = KERN_OVERFLOWUID,
 591                 .procname       = "overflowuid",
 592                 .data           = &overflowuid,
 593                 .maxlen         = sizeof(int),
 594                 .mode           = 0644,
 595                 .proc_handler   = &proc_dointvec_minmax,
 596                 .strategy       = &sysctl_intvec,
 597                 .extra1         = &minolduid,
 598                 .extra2         = &maxolduid,
 599         },
 600         {
 601                 .ctl_name       = KERN_OVERFLOWGID,
 602                 .procname       = "overflowgid",
 603                 .data           = &overflowgid,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec_minmax,
 607                 .strategy       = &sysctl_intvec,
 608                 .extra1         = &minolduid,
 609                 .extra2         = &maxolduid,
 610         },
 611 #ifdef CONFIG_ARCH_S390
 612 #ifdef CONFIG_MATHEMU
 613         {
 614                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 615                 .procname       = "ieee_emulation_warnings",
 616                 .data           = &sysctl_ieee_emulation_warnings,
 617                 .maxlen         = sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec,
 620         },
 621 #endif
 622 #ifdef CONFIG_NO_IDLE_HZ
 623         {
 624                 .ctl_name       = KERN_HZ_TIMER,
 625                 .procname       = "hz_timer",
 626                 .data           = &sysctl_hz_timer,
 627                 .maxlen         = sizeof(int),
 628                 .mode           = 0644,
 629                 .proc_handler   = &proc_dointvec,
 630         },
 631 #endif
 632         {
 633                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 634                 .procname       = "userprocess_debug",
 635                 .data           = &sysctl_userprocess_debug,
 636                 .maxlen         = sizeof(int),
 637                 .mode           = 0644,
 638                 .proc_handler   = &proc_dointvec,
 639         },
 640 #endif
 641         {
 642                 .ctl_name       = KERN_PIDMAX,
 643                 .procname       = "pid_max",
 644                 .data           = &pid_max,
 645                 .maxlen         = sizeof (int),
 646                 .mode           = 0644,
 647                 .proc_handler   = &proc_dointvec_minmax,
 648                 .strategy       = sysctl_intvec,
 649                 .extra1         = &pid_max_min,
 650                 .extra2         = &pid_max_max,
 651         },
 652         {
 653                 .ctl_name       = KERN_PANIC_ON_OOPS,
 654                 .procname       = "panic_on_oops",
 655                 .data           = &panic_on_oops,
 656                 .maxlen         = sizeof(int),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_dointvec,
 659         },
 660         {
 661                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 662                 .procname       = "printk_ratelimit",
 663                 .data           = &printk_ratelimit_jiffies,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 .proc_handler   = &proc_dointvec_jiffies,
 667                 .strategy       = &sysctl_jiffies,
 668         },
 669         {
 670                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 671                 .procname       = "printk_ratelimit_burst",
 672                 .data           = &printk_ratelimit_burst,
 673                 .maxlen         = sizeof(int),
 674                 .mode           = 0644,
 675                 .proc_handler   = &proc_dointvec,
 676         },
 677         {
 678                 .ctl_name       = KERN_NGROUPS_MAX,
 679                 .procname       = "ngroups_max",
 680                 .data           = &ngroups_max,
 681                 .maxlen         = sizeof (int),
 682                 .mode           = 0444,
 683                 .proc_handler   = &proc_dointvec,
 684         },
 685 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 686         {
 687                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 688                 .procname       = "unknown_nmi_panic",
 689                 .data           = &unknown_nmi_panic,
 690                 .maxlen         = sizeof (int),
 691                 .mode           = 0644,
 692                 .proc_handler   = &proc_unknown_nmi_panic,
 693         },
 694 #endif
 695         {
 696                 .ctl_name       = KERN_SETUID_DUMPABLE,
 697                 .procname       = "suid_dumpable",
 698                 .data           = &suid_dumpable,
 699                 .maxlen         = sizeof(int),
 700                 .mode           = 0644,
 701                 .proc_handler   = &proc_dointvec,
 702         },
 703         { .ctl_name = 0 }
 704 };
 705
 706 /* Constants for minimum and maximum testing in vm_table.
 707    We use these as one-element integer vectors. */
 708 static int zero;
 709 static int one_hundred = 100;
 710
 711
 712 static ctl_table vm_table[] = {
 713         {
 714                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 715                 .procname       = "overcommit_memory",
 716                 .data           = &sysctl_overcommit_memory,
 717                 .maxlen         = sizeof(sysctl_overcommit_memory),
 718                 .mode           = 0644,
 719                 .proc_handler   = &proc_dointvec,
 720         },
 721         {
 722                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 723                 .procname       = "overcommit_ratio",
 724                 .data           = &sysctl_overcommit_ratio,
 725                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 726                 .mode           = 0644,
 727                 .proc_handler   = &proc_dointvec,
 728         },
 729         {
 730                 .ctl_name       = VM_PAGE_CLUSTER,
 731                 .procname       = "page-cluster",
 732                 .data           = &page_cluster,
 733                 .maxlen         = sizeof(int),
 734                 .mode           = 0644,
 735                 .proc_handler   = &proc_dointvec,
 736         },
 737         {
 738                 .ctl_name       = VM_DIRTY_BACKGROUND,
 739                 .procname       = "dirty_background_ratio",
 740                 .data           = &dirty_background_ratio,
 741                 .maxlen         = sizeof(dirty_background_ratio),
 742                 .mode           = 0644,
 743                 .proc_handler   = &proc_dointvec_minmax,
 744                 .strategy       = &sysctl_intvec,
 745                 .extra1         = &zero,
 746                 .extra2         = &one_hundred,
 747         },
 748         {
 749                 .ctl_name       = VM_DIRTY_RATIO,
 750                 .procname       = "dirty_ratio",
 751                 .data           = &vm_dirty_ratio,
 752                 .maxlen         = sizeof(vm_dirty_ratio),
 753                 .mode           = 0644,
 754                 .proc_handler   = &proc_dointvec_minmax,
 755                 .strategy       = &sysctl_intvec,
 756                 .extra1         = &zero,
 757                 .extra2         = &one_hundred,
 758         },
 759         {
 760                 .ctl_name       = VM_DIRTY_WB_CS,
 761                 .procname       = "dirty_writeback_centisecs",
 762                 .data           = &dirty_writeback_centisecs,
 763                 .maxlen         = sizeof(dirty_writeback_centisecs),
 764                 .mode           = 0644,
 765                 .proc_handler   = &dirty_writeback_centisecs_handler,
 766         },
 767         {
 768                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
 769                 .procname       = "dirty_expire_centisecs",
 770                 .data           = &dirty_expire_centisecs,
 771                 .maxlen         = sizeof(dirty_expire_centisecs),
 772                 .mode           = 0644,
 773                 .proc_handler   = &proc_dointvec,
 774         },
 775         {
 776                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 777                 .procname       = "nr_pdflush_threads",
 778                 .data           = &nr_pdflush_threads,
 779                 .maxlen         = sizeof nr_pdflush_threads,
 780                 .mode           = 0444 /* read-only*/,
 781                 .proc_handler   = &proc_dointvec,
 782         },
 783         {
 784                 .ctl_name       = VM_SWAPPINESS,
 785                 .procname       = "swappiness",
 786                 .data           = &vm_swappiness,
 787                 .maxlen         = sizeof(vm_swappiness),
 788                 .mode           = 0644,
 789                 .proc_handler   = &proc_dointvec_minmax,
 790                 .strategy       = &sysctl_intvec,
 791                 .extra1         = &zero,
 792                 .extra2         = &one_hundred,
 793         },
 794 #ifdef CONFIG_HUGETLB_PAGE
 795          {
 796                 .ctl_name       = VM_HUGETLB_PAGES,
 797                 .procname       = "nr_hugepages",
 798                 .data           = &max_huge_pages,
 799                 .maxlen         = sizeof(unsigned long),
 800                 .mode           = 0644,
 801                 .proc_handler   = &hugetlb_sysctl_handler,
 802                 .extra1         = (void *)&hugetlb_zero,
 803                 .extra2         = (void *)&hugetlb_infinity,
 804          },
 805          {
 806                 .ctl_name       = VM_HUGETLB_GROUP,
 807                 .procname       = "hugetlb_shm_group",
 808                 .data           = &sysctl_hugetlb_shm_group,
 809                 .maxlen         = sizeof(gid_t),
 810                 .mode           = 0644,
 811                 .proc_handler   = &proc_dointvec,
 812          },
 813 #endif
 814         {
 815                 .ctl_name       = VM_LOWER_ZONE_PROTECTION,
 816                 .procname       = "lower_zone_protection",
 817                 .data           = &sysctl_lower_zone_protection,
 818                 .maxlen         = sizeof(sysctl_lower_zone_protection),
 819                 .mode           = 0644,
 820                 .proc_handler   = &lower_zone_protection_sysctl_handler,
 821                 .strategy       = &sysctl_intvec,
 822                 .extra1         = &zero,
 823         },
 824         {
 825                 .ctl_name       = VM_MIN_FREE_KBYTES,
 826                 .procname       = "min_free_kbytes",
 827                 .data           = &min_free_kbytes,
 828                 .maxlen         = sizeof(min_free_kbytes),
 829                 .mode           = 0644,
 830                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 831                 .strategy       = &sysctl_intvec,
 832                 .extra1         = &zero,
 833         },
 834         {
 835                 .ctl_name       = VM_MAX_MAP_COUNT,
 836                 .procname       = "max_map_count",
 837                 .data           = &sysctl_max_map_count,
 838                 .maxlen         = sizeof(sysctl_max_map_count),
 839                 .mode           = 0644,
 840                 .proc_handler   = &proc_dointvec
 841         },
 842         {
 843                 .ctl_name       = VM_LAPTOP_MODE,
 844                 .procname       = "laptop_mode",
 845                 .data           = &laptop_mode,
 846                 .maxlen         = sizeof(laptop_mode),
 847                 .mode           = 0644,
 848                 .proc_handler   = &proc_dointvec,
 849                 .strategy       = &sysctl_intvec,
 850                 .extra1         = &zero,
 851         },
 852         {
 853                 .ctl_name       = VM_BLOCK_DUMP,
 854                 .procname       = "block_dump",
 855                 .data           = &block_dump,
 856                 .maxlen         = sizeof(block_dump),
 857                 .mode           = 0644,
 858                 .proc_handler   = &proc_dointvec,
 859                 .strategy       = &sysctl_intvec,
 860                 .extra1         = &zero,
 861         },
 862         {
 863                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 864                 .procname       = "vfs_cache_pressure",
 865                 .data           = &sysctl_vfs_cache_pressure,
 866                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 867                 .mode           = 0644,
 868                 .proc_handler   = &proc_dointvec,
 869                 .strategy       = &sysctl_intvec,
 870                 .extra1         = &zero,
 871         },
 872 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 873         {
 874                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 875                 .procname       = "legacy_va_layout",
 876                 .data           = &sysctl_legacy_va_layout,
 877                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 878                 .mode           = 0644,
 879                 .proc_handler   = &proc_dointvec,
 880                 .strategy       = &sysctl_intvec,
 881                 .extra1         = &zero,
 882         },
 883 #endif
 884 #ifdef CONFIG_SWAP
 885         {
 886                 .ctl_name       = VM_SWAP_TOKEN_TIMEOUT,
 887                 .procname       = "swap_token_timeout",
 888                 .data           = &swap_token_default_timeout,
 889                 .maxlen         = sizeof(swap_token_default_timeout),
 890                 .mode           = 0644,
 891                 .proc_handler   = &proc_dointvec_jiffies,
 892                 .strategy       = &sysctl_jiffies,
 893         },
 894 #endif
 895         { .ctl_name = 0 }
 896 };
 897
 898 static ctl_table proc_table[] = {
 899         { .ctl_name = 0 }
 900 };
 901
 902 static ctl_table fs_table[] = {
 903         {
 904                 .ctl_name       = FS_NRINODE,
 905                 .procname       = "inode-nr",
 906                 .data           = &inodes_stat,
 907                 .maxlen         = 2*sizeof(int),
 908                 .mode           = 0444,
 909                 .proc_handler   = &proc_dointvec,
 910         },
 911         {
 912                 .ctl_name       = FS_STATINODE,
 913                 .procname       = "inode-state",
 914                 .data           = &inodes_stat,
 915                 .maxlen         = 7*sizeof(int),
 916                 .mode           = 0444,
 917                 .proc_handler   = &proc_dointvec,
 918         },
 919         {
 920                 .ctl_name       = FS_NRFILE,
 921                 .procname       = "file-nr",
 922                 .data           = &files_stat,
 923                 .maxlen         = 3*sizeof(int),
 924                 .mode           = 0444,
 925                 .proc_handler   = &proc_dointvec,
 926         },
 927         {
 928                 .ctl_name       = FS_MAXFILE,
 929                 .procname       = "file-max",
 930                 .data           = &files_stat.max_files,
 931                 .maxlen         = sizeof(int),
 932                 .mode           = 0644,
 933                 .proc_handler   = &proc_dointvec,
 934         },
 935         {
 936                 .ctl_name       = FS_DENTRY,
 937                 .procname       = "dentry-state",
 938                 .data           = &dentry_stat,
 939                 .maxlen         = 6*sizeof(int),
 940                 .mode           = 0444,
 941                 .proc_handler   = &proc_dointvec,
 942         },
 943         {
 944                 .ctl_name       = FS_OVERFLOWUID,
 945                 .procname       = "overflowuid",
 946                 .data           = &fs_overflowuid,
 947                 .maxlen         = sizeof(int),
 948                 .mode           = 0644,
 949                 .proc_handler   = &proc_dointvec_minmax,
 950                 .strategy       = &sysctl_intvec,
 951                 .extra1         = &minolduid,
 952                 .extra2         = &maxolduid,
 953         },
 954         {
 955                 .ctl_name       = FS_OVERFLOWGID,
 956                 .procname       = "overflowgid",
 957                 .data           = &fs_overflowgid,
 958                 .maxlen         = sizeof(int),
 959                 .mode           = 0644,
 960                 .proc_handler   = &proc_dointvec_minmax,
 961                 .strategy       = &sysctl_intvec,
 962                 .extra1         = &minolduid,
 963                 .extra2         = &maxolduid,
 964         },
 965         {
 966                 .ctl_name       = FS_LEASES,
 967                 .procname       = "leases-enable",
 968                 .data           = &leases_enable,
 969                 .maxlen         = sizeof(int),
 970                 .mode           = 0644,
 971                 .proc_handler   = &proc_dointvec,
 972         },
 973 #ifdef CONFIG_DNOTIFY
 974         {
 975                 .ctl_name       = FS_DIR_NOTIFY,
 976                 .procname       = "dir-notify-enable",
 977                 .data           = &dir_notify_enable,
 978                 .maxlen         = sizeof(int),
 979                 .mode           = 0644,
 980                 .proc_handler   = &proc_dointvec,
 981         },
 982 #endif
 983         {
 984                 .ctl_name       = FS_LEASE_TIME,
 985                 .procname       = "lease-break-time",
 986                 .data           = &lease_break_time,
 987                 .maxlen         = sizeof(int),
 988                 .mode           = 0644,
 989                 .proc_handler   = &proc_dointvec,
 990         },
 991         {
 992                 .ctl_name       = FS_AIO_NR,
 993                 .procname       = "aio-nr",
 994                 .data           = &aio_nr,
 995                 .maxlen         = sizeof(aio_nr),
 996                 .mode           = 0444,
 997                 .proc_handler   = &proc_dointvec,
 998         },
 999         {
1000                 .ctl_name       = FS_AIO_MAX_NR,
1001                 .procname       = "aio-max-nr",
1002                 .data           = &aio_max_nr,
1003                 .maxlen         = sizeof(aio_max_nr),
1004                 .mode           = 0644,
1005                 .proc_handler   = &proc_dointvec,
1006         },
1007         { .ctl_name = 0 }
1008 };
1009
1010 static ctl_table debug_table[] = {
1011         { .ctl_name = 0 }
1012 };
1013
1014 static ctl_table dev_table[] = {
1015         { .ctl_name = 0 }
1016 };
1017
1018 extern void init_irq_proc (void);
1019
1020 void __init sysctl_init(void)
1021 {
1022 #ifdef CONFIG_PROC_FS
1023         register_proc_table(root_table, proc_sys_root);
1024         init_irq_proc();
1025 #endif
1026 }
1027
1028 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1029                void __user *newval, size_t newlen)
1030 {
1031         struct list_head *tmp;
1032
1033         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1034                 return -ENOTDIR;
1035         if (oldval) {
1036                 int old_len;
1037                 if (!oldlenp || get_user(old_len, oldlenp))
1038                         return -EFAULT;
1039         }
1040         tmp = &root_table_header.ctl_entry;
1041         do {
1042                 struct ctl_table_header *head =
1043                         list_entry(tmp, struct ctl_table_header, ctl_entry);
1044                 void *context = NULL;
1045                 int error = parse_table(name, nlen, oldval, oldlenp,
1046                                         newval, newlen, head->ctl_table,
1047                                         &context);
1048                 if (context)
1049                         kfree(context);
1050                 if (error != -ENOTDIR)
1051                         return error;
1052                 tmp = tmp->next;
1053         } while (tmp != &root_table_header.ctl_entry);
1054         return -ENOTDIR;
1055 }
1056
1057 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1058 {
1059         struct __sysctl_args tmp;
1060         int error;
1061
1062         if (copy_from_user(&tmp, args, sizeof(tmp)))
1063                 return -EFAULT;
1064
1065         lock_kernel();
1066         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1067                           tmp.newval, tmp.newlen);
1068         unlock_kernel();
1069         return error;
1070 }
1071
1072 /*
1073  * ctl_perm does NOT grant the superuser all rights automatically, because
1074  * some sysctl variables are readonly even to root.
1075  */
1076
1077 static int test_perm(int mode, int op)
1078 {
1079         if (!current->euid)
1080                 mode >>= 6;
1081         else if (in_egroup_p(0))
1082                 mode >>= 3;
1083         if ((mode & op & 0007) == op)
1084                 return 0;
1085         return -EACCES;
1086 }
1087
1088 static inline int ctl_perm(ctl_table *table, int op)
1089 {
1090         int error;
1091         error = security_sysctl(table, op);
1092         if (error)
1093                 return error;
1094         return test_perm(table->mode, op);
1095 }
1096
1097 static int parse_table(int __user *name, int nlen,
1098                        void __user *oldval, size_t __user *oldlenp,
1099                        void __user *newval, size_t newlen,
1100                        ctl_table *table, void **context)
1101 {
1102         int n;
1103 repeat:
1104         if (!nlen)
1105                 return -ENOTDIR;
1106         if (get_user(n, name))
1107                 return -EFAULT;
1108         for ( ; table->ctl_name; table++) {
1109                 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1110                         int error;
1111                         if (table->child) {
1112                                 if (ctl_perm(table, 001))
1113                                         return -EPERM;
1114                                 if (table->strategy) {
1115                                         error = table->strategy(
1116                                                 table, name, nlen,
1117                                                 oldval, oldlenp,
1118                                                 newval, newlen, context);
1119                                         if (error)
1120                                                 return error;
1121                                 }
1122                                 name++;
1123                                 nlen--;
1124                                 table = table->child;
1125                                 goto repeat;
1126                         }
1127                         error = do_sysctl_strategy(table, name, nlen,
1128                                                    oldval, oldlenp,
1129                                                    newval, newlen, context);
1130                         return error;
1131                 }
1132         }
1133         return -ENOTDIR;
1134 }
1135
1136 /* Perform the actual read/write of a sysctl table entry. */
1137 int do_sysctl_strategy (ctl_table *table,
1138                         int __user *name, int nlen,
1139                         void __user *oldval, size_t __user *oldlenp,
1140                         void __user *newval, size_t newlen, void **context)
1141 {
1142         int op = 0, rc;
1143         size_t len;
1144
1145         if (oldval)
1146                 op |= 004;
1147         if (newval)
1148                 op |= 002;
1149         if (ctl_perm(table, op))
1150                 return -EPERM;
1151
1152         if (table->strategy) {
1153                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1154                                      newval, newlen, context);
1155                 if (rc < 0)
1156                         return rc;
1157                 if (rc > 0)
1158                         return 0;
1159         }
1160
1161         /* If there is no strategy routine, or if the strategy returns
1162          * zero, proceed with automatic r/w */
1163         if (table->data && table->maxlen) {
1164                 if (oldval && oldlenp) {
1165                         if (get_user(len, oldlenp))
1166                                 return -EFAULT;
1167                         if (len) {
1168                                 if (len > table->maxlen)
1169                                         len = table->maxlen;
1170                                 if(copy_to_user(oldval, table->data, len))
1171                                         return -EFAULT;
1172                                 if(put_user(len, oldlenp))
1173                                         return -EFAULT;
1174                         }
1175                 }
1176                 if (newval && newlen) {
1177                         len = newlen;
1178                         if (len > table->maxlen)
1179                                 len = table->maxlen;
1180                         if(copy_from_user(table->data, newval, len))
1181                                 return -EFAULT;
1182                 }
1183         }
1184         return 0;
1185 }
1186
1187 /**
1188  * register_sysctl_table - register a sysctl hierarchy
1189  * @table: the top-level table structure
1190  * @insert_at_head: whether the entry should be inserted in front or at the end
1191  *
1192  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1193  * array. An entry with a ctl_name of 0 terminates the table.
1194  *
1195  * The members of the &ctl_table structure are used as follows:
1196  *
1197  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1198  *            must be unique within that level of sysctl
1199  *
1200  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1201  *            enter a sysctl file
1202  *
1203  * data - a pointer to data for use by proc_handler
1204  *
1205  * maxlen - the maximum size in bytes of the data
1206  *
1207  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1208  *
1209  * child - a pointer to the child sysctl table if this entry is a directory, or
1210  *         %NULL.
1211  *
1212  * proc_handler - the text handler routine (described below)
1213  *
1214  * strategy - the strategy routine (described below)
1215  *
1216  * de - for internal use by the sysctl routines
1217  *
1218  * extra1, extra2 - extra pointers usable by the proc handler routines
1219  *
1220  * Leaf nodes in the sysctl tree will be represented by a single file
1221  * under /proc; non-leaf nodes will be represented by directories.
1222  *
1223  * sysctl(2) can automatically manage read and write requests through
1224  * the sysctl table.  The data and maxlen fields of the ctl_table
1225  * struct enable minimal validation of the values being written to be
1226  * performed, and the mode field allows minimal authentication.
1227  *
1228  * More sophisticated management can be enabled by the provision of a
1229  * strategy routine with the table entry.  This will be called before
1230  * any automatic read or write of the data is performed.
1231  *
1232  * The strategy routine may return
1233  *
1234  * < 0 - Error occurred (error is passed to user process)
1235  *
1236  * 0   - OK - proceed with automatic read or write.
1237  *
1238  * > 0 - OK - read or write has been done by the strategy routine, so
1239  *       return immediately.
1240  *
1241  * There must be a proc_handler routine for any terminal nodes
1242  * mirrored under /proc/sys (non-terminals are handled by a built-in
1243  * directory handler).  Several default handlers are available to
1244  * cover common cases -
1245  *
1246  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1247  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1248  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1249  *
1250  * It is the handler's job to read the input buffer from user memory
1251  * and process it. The handler should return 0 on success.
1252  *
1253  * This routine returns %NULL on a failure to register, and a pointer
1254  * to the table header on success.
1255  */
1256 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1257                                                int insert_at_head)
1258 {
1259         struct ctl_table_header *tmp;
1260         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1261         if (!tmp)
1262                 return NULL;
1263         tmp->ctl_table = table;
1264         INIT_LIST_HEAD(&tmp->ctl_entry);
1265         if (insert_at_head)
1266                 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1267         else
1268                 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1269 #ifdef CONFIG_PROC_FS
1270         register_proc_table(table, proc_sys_root);
1271 #endif
1272         return tmp;
1273 }
1274
1275 /**
1276  * unregister_sysctl_table - unregister a sysctl table hierarchy
1277  * @header: the header returned from register_sysctl_table
1278  *
1279  * Unregisters the sysctl table and all children. proc entries may not
1280  * actually be removed until they are no longer used by anyone.
1281  */
1282 void unregister_sysctl_table(struct ctl_table_header * header)
1283 {
1284         list_del(&header->ctl_entry);
1285 #ifdef CONFIG_PROC_FS
1286         unregister_proc_table(header->ctl_table, proc_sys_root);
1287 #endif
1288         kfree(header);
1289 }
1290
1291 /*
1292  * /proc/sys support
1293  */
1294
1295 #ifdef CONFIG_PROC_FS
1296
1297 /* Scan the sysctl entries in table and add them all into /proc */
1298 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root)
1299 {
1300         struct proc_dir_entry *de;
1301         int len;
1302         mode_t mode;
1303
1304         for (; table->ctl_name; table++) {
1305                 /* Can't do anything without a proc name. */
1306                 if (!table->procname)
1307                         continue;
1308                 /* Maybe we can't do anything with it... */
1309                 if (!table->proc_handler && !table->child) {
1310                         printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1311                                 table->procname);
1312                         continue;
1313                 }
1314
1315                 len = strlen(table->procname);
1316                 mode = table->mode;
1317
1318                 de = NULL;
1319                 if (table->proc_handler)
1320                         mode |= S_IFREG;
1321                 else {
1322                         mode |= S_IFDIR;
1323                         for (de = root->subdir; de; de = de->next) {
1324                                 if (proc_match(len, table->procname, de))
1325                                         break;
1326                         }
1327                         /* If the subdir exists already, de is non-NULL */
1328                 }
1329
1330                 if (!de) {
1331                         de = create_proc_entry(table->procname, mode, root);
1332                         if (!de)
1333                                 continue;
1334                         de->data = (void *) table;
1335                         if (table->proc_handler)
1336                                 de->proc_fops = &proc_sys_file_operations;
1337                 }
1338                 table->de = de;
1339                 if (de->mode & S_IFDIR)
1340                         register_proc_table(table->child, de);
1341         }
1342 }
1343
1344 /*
1345  * Unregister a /proc sysctl table and any subdirectories.
1346  */
1347 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1348 {
1349         struct proc_dir_entry *de;
1350         for (; table->ctl_name; table++) {
1351                 if (!(de = table->de))
1352                         continue;
1353                 if (de->mode & S_IFDIR) {
1354                         if (!table->child) {
1355                                 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1356                                 continue;
1357                         }
1358                         unregister_proc_table(table->child, de);
1359
1360                         /* Don't unregister directories which still have entries.. */
1361                         if (de->subdir)
1362                                 continue;
1363                 }
1364
1365                 /* Don't unregister proc entries that are still being used.. */
1366                 if (atomic_read(&de->count))
1367                         continue;
1368
1369                 table->de = NULL;
1370                 remove_proc_entry(table->procname, root);
1371         }
1372 }
1373
1374 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1375                           size_t count, loff_t *ppos)
1376 {
1377         int op;
1378         struct proc_dir_entry *de;
1379         struct ctl_table *table;
1380         size_t res;
1381         ssize_t error;
1382
1383         de = PDE(file->f_dentry->d_inode);
1384         if (!de || !de->data)
1385                 return -ENOTDIR;
1386         table = (struct ctl_table *) de->data;
1387         if (!table || !table->proc_handler)
1388                 return -ENOTDIR;
1389         op = (write ? 002 : 004);
1390         if (ctl_perm(table, op))
1391                 return -EPERM;
1392
1393         res = count;
1394
1395         error = (*table->proc_handler) (table, write, file, buf, &res, ppos);
1396         if (error)
1397                 return error;
1398         return res;
1399 }
1400
1401 static int proc_opensys(struct inode *inode, struct file *file)
1402 {
1403         if (file->f_mode & FMODE_WRITE) {
1404                 /*
1405                  * sysctl entries that are not writable,
1406                  * are _NOT_ writable, capabilities or not.
1407                  */
1408                 if (!(inode->i_mode & S_IWUSR))
1409                         return -EPERM;
1410         }
1411
1412         return 0;
1413 }
1414
1415 static ssize_t proc_readsys(struct file * file, char __user * buf,
1416                             size_t count, loff_t *ppos)
1417 {
1418         return do_rw_proc(0, file, buf, count, ppos);
1419 }
1420
1421 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1422                              size_t count, loff_t *ppos)
1423 {
1424         return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1425 }
1426
1427 /**
1428  * proc_dostring - read a string sysctl
1429  * @table: the sysctl table
1430  * @write: %TRUE if this is a write to the sysctl file
1431  * @filp: the file structure
1432  * @buffer: the user buffer
1433  * @lenp: the size of the user buffer
1434  *
1435  * Reads/writes a string from/to the user buffer. If the kernel
1436  * buffer provided is not large enough to hold the string, the
1437  * string is truncated. The copied string is %NULL-terminated.
1438  * If the string is being read by the user process, it is copied
1439  * and a newline '\n' is added. It is truncated if the buffer is
1440  * not large enough.
1441  *
1442  * Returns 0 on success.
1443  */
1444 int proc_dostring(ctl_table *table, int write, struct file *filp,
1445                   void __user *buffer, size_t *lenp, loff_t *ppos)
1446 {
1447         size_t len;
1448         char __user *p;
1449         char c;
1450
1451         if (!table->data || !table->maxlen || !*lenp ||
1452             (*ppos && !write)) {
1453                 *lenp = 0;
1454                 return 0;
1455         }
1456
1457         if (write) {
1458                 len = 0;
1459                 p = buffer;
1460                 while (len < *lenp) {
1461                         if (get_user(c, p++))
1462                                 return -EFAULT;
1463                         if (c == 0 || c == '\n')
1464                                 break;
1465                         len++;
1466                 }
1467                 if (len >= table->maxlen)
1468                         len = table->maxlen-1;
1469                 if(copy_from_user(table->data, buffer, len))
1470                         return -EFAULT;
1471                 ((char *) table->data)[len] = 0;
1472                 *ppos += *lenp;
1473         } else {
1474                 len = strlen(table->data);
1475                 if (len > table->maxlen)
1476                         len = table->maxlen;
1477                 if (len > *lenp)
1478                         len = *lenp;
1479                 if (len)
1480                         if(copy_to_user(buffer, table->data, len))
1481                                 return -EFAULT;
1482                 if (len < *lenp) {
1483                         if(put_user('\n', ((char __user *) buffer) + len))
1484                                 return -EFAULT;
1485                         len++;
1486                 }
1487                 *lenp = len;
1488                 *ppos += len;
1489         }
1490         return 0;
1491 }
1492
1493 /*
1494  *      Special case of dostring for the UTS structure. This has locks
1495  *      to observe. Should this be in kernel/sys.c ????
1496  */
1497
1498 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1499                   void __user *buffer, size_t *lenp, loff_t *ppos)
1500 {
1501         int r;
1502
1503         if (!write) {
1504                 down_read(&uts_sem);
1505                 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1506                 up_read(&uts_sem);
1507         } else {
1508                 down_write(&uts_sem);
1509                 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1510                 up_write(&uts_sem);
1511         }
1512         return r;
1513 }
1514
1515 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1516                                  int *valp,
1517                                  int write, void *data)
1518 {
1519         if (write) {
1520                 *valp = *negp ? -*lvalp : *lvalp;
1521         } else {
1522                 int val = *valp;
1523                 if (val < 0) {
1524                         *negp = -1;
1525                         *lvalp = (unsigned long)-val;
1526                 } else {
1527                         *negp = 0;
1528                         *lvalp = (unsigned long)val;
1529                 }
1530         }
1531         return 0;
1532 }
1533
1534 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1535                   void __user *buffer, size_t *lenp, loff_t *ppos,
1536                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1537                               int write, void *data),
1538                   void *data)
1539 {
1540 #define TMPBUFLEN 21
1541         int *i, vleft, first=1, neg, val;
1542         unsigned long lval;
1543         size_t left, len;
1544
1545         char buf[TMPBUFLEN], *p;
1546         char __user *s = buffer;
1547
1548         if (!table->data || !table->maxlen || !*lenp ||
1549             (*ppos && !write)) {
1550                 *lenp = 0;
1551                 return 0;
1552         }
1553
1554         i = (int *) table->data;
1555         vleft = table->maxlen / sizeof(*i);
1556         left = *lenp;
1557
1558         if (!conv)
1559                 conv = do_proc_dointvec_conv;
1560
1561         for (; left && vleft--; i++, first=0) {
1562                 if (write) {
1563                         while (left) {
1564                                 char c;
1565                                 if (get_user(c, s))
1566                                         return -EFAULT;
1567                                 if (!isspace(c))
1568                                         break;
1569                                 left--;
1570                                 s++;
1571                         }
1572                         if (!left)
1573                                 break;
1574                         neg = 0;
1575                         len = left;
1576                         if (len > sizeof(buf) - 1)
1577                                 len = sizeof(buf) - 1;
1578                         if (copy_from_user(buf, s, len))
1579                                 return -EFAULT;
1580                         buf[len] = 0;
1581                         p = buf;
1582                         if (*p == '-' && left > 1) {
1583                                 neg = 1;
1584                                 left--, p++;
1585                         }
1586                         if (*p < '0' || *p > '9')
1587                                 break;
1588
1589                         lval = simple_strtoul(p, &p, 0);
1590
1591                         len = p-buf;
1592                         if ((len < left) && *p && !isspace(*p))
1593                                 break;
1594                         if (neg)
1595                                 val = -val;
1596                         s += len;
1597                         left -= len;
1598
1599                         if (conv(&neg, &lval, i, 1, data))
1600                                 break;
1601                 } else {
1602                         p = buf;
1603                         if (!first)
1604                                 *p++ = '\t';
1605
1606                         if (conv(&neg, &lval, i, 0, data))
1607                                 break;
1608
1609                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1610                         len = strlen(buf);
1611                         if (len > left)
1612                                 len = left;
1613                         if(copy_to_user(s, buf, len))
1614                                 return -EFAULT;
1615                         left -= len;
1616                         s += len;
1617                 }
1618         }
1619
1620         if (!write && !first && left) {
1621                 if(put_user('\n', s))
1622                         return -EFAULT;
1623                 left--, s++;
1624         }
1625         if (write) {
1626                 while (left) {
1627                         char c;
1628                         if (get_user(c, s++))
1629                                 return -EFAULT;
1630                         if (!isspace(c))
1631                                 break;
1632                         left--;
1633                 }
1634         }
1635         if (write && first)
1636                 return -EINVAL;
1637         *lenp -= left;
1638         *ppos += *lenp;
1639         return 0;
1640 #undef TMPBUFLEN
1641 }
1642
1643 /**
1644  * proc_dointvec - read a vector of integers
1645  * @table: the sysctl table
1646  * @write: %TRUE if this is a write to the sysctl file
1647  * @filp: the file structure
1648  * @buffer: the user buffer
1649  * @lenp: the size of the user buffer
1650  *
1651  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1652  * values from/to the user buffer, treated as an ASCII string.
1653  *
1654  * Returns 0 on success.
1655  */
1656 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1657                      void __user *buffer, size_t *lenp, loff_t *ppos)
1658 {
1659     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1660                             NULL,NULL);
1661 }
1662
1663 #define OP_SET  0
1664 #define OP_AND  1
1665 #define OP_OR   2
1666 #define OP_MAX  3
1667 #define OP_MIN  4
1668
1669 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1670                                       int *valp,
1671                                       int write, void *data)
1672 {
1673         int op = *(int *)data;
1674         if (write) {
1675                 int val = *negp ? -*lvalp : *lvalp;
1676                 switch(op) {
1677                 case OP_SET:    *valp = val; break;
1678                 case OP_AND:    *valp &= val; break;
1679                 case OP_OR:     *valp |= val; break;
1680                 case OP_MAX:    if(*valp < val)
1681                                         *valp = val;
1682                                 break;
1683                 case OP_MIN:    if(*valp > val)
1684                                 *valp = val;
1685                                 break;
1686                 }
1687         } else {
1688                 int val = *valp;
1689                 if (val < 0) {
1690                         *negp = -1;
1691                         *lvalp = (unsigned long)-val;
1692                 } else {
1693                         *negp = 0;
1694                         *lvalp = (unsigned long)val;
1695                 }
1696         }
1697         return 0;
1698 }
1699
1700 /*
1701  *      init may raise the set.
1702  */
1703
1704 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1705                         void __user *buffer, size_t *lenp, loff_t *ppos)
1706 {
1707         int op;
1708
1709         if (!capable(CAP_SYS_MODULE)) {
1710                 return -EPERM;
1711         }
1712
1713         op = (current->pid == 1) ? OP_SET : OP_AND;
1714         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1715                                 do_proc_dointvec_bset_conv,&op);
1716 }
1717
1718 struct do_proc_dointvec_minmax_conv_param {
1719         int *min;
1720         int *max;
1721 };
1722
1723 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1724                                         int *valp,
1725                                         int write, void *data)
1726 {
1727         struct do_proc_dointvec_minmax_conv_param *param = data;
1728         if (write) {
1729                 int val = *negp ? -*lvalp : *lvalp;
1730                 if ((param->min && *param->min > val) ||
1731                     (param->max && *param->max < val))
1732                         return -EINVAL;
1733                 *valp = val;
1734         } else {
1735                 int val = *valp;
1736                 if (val < 0) {
1737                         *negp = -1;
1738                         *lvalp = (unsigned long)-val;
1739                 } else {
1740                         *negp = 0;
1741                         *lvalp = (unsigned long)val;
1742                 }
1743         }
1744         return 0;
1745 }
1746
1747 /**
1748  * proc_dointvec_minmax - read a vector of integers with min/max values
1749  * @table: the sysctl table
1750  * @write: %TRUE if this is a write to the sysctl file
1751  * @filp: the file structure
1752  * @buffer: the user buffer
1753  * @lenp: the size of the user buffer
1754  *
1755  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1756  * values from/to the user buffer, treated as an ASCII string.
1757  *
1758  * This routine will ensure the values are within the range specified by
1759  * table->extra1 (min) and table->extra2 (max).
1760  *
1761  * Returns 0 on success.
1762  */
1763 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1764                   void __user *buffer, size_t *lenp, loff_t *ppos)
1765 {
1766         struct do_proc_dointvec_minmax_conv_param param = {
1767                 .min = (int *) table->extra1,
1768                 .max = (int *) table->extra2,
1769         };
1770         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1771                                 do_proc_dointvec_minmax_conv, &param);
1772 }
1773
1774 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1775                                      struct file *filp,
1776                                      void __user *buffer,
1777                                      size_t *lenp, loff_t *ppos,
1778                                      unsigned long convmul,
1779                                      unsigned long convdiv)
1780 {
1781 #define TMPBUFLEN 21
1782         unsigned long *i, *min, *max, val;
1783         int vleft, first=1, neg;
1784         size_t len, left;
1785         char buf[TMPBUFLEN], *p;
1786         char __user *s = buffer;
1787
1788         if (!table->data || !table->maxlen || !*lenp ||
1789             (*ppos && !write)) {
1790                 *lenp = 0;
1791                 return 0;
1792         }
1793
1794         i = (unsigned long *) table->data;
1795         min = (unsigned long *) table->extra1;
1796         max = (unsigned long *) table->extra2;
1797         vleft = table->maxlen / sizeof(unsigned long);
1798         left = *lenp;
1799
1800         for (; left && vleft--; i++, min++, max++, first=0) {
1801                 if (write) {
1802                         while (left) {
1803                                 char c;
1804                                 if (get_user(c, s))
1805                                         return -EFAULT;
1806                                 if (!isspace(c))
1807                                         break;
1808                                 left--;
1809                                 s++;
1810                         }
1811                         if (!left)
1812                                 break;
1813                         neg = 0;
1814                         len = left;
1815                         if (len > TMPBUFLEN-1)
1816                                 len = TMPBUFLEN-1;
1817                         if (copy_from_user(buf, s, len))
1818                                 return -EFAULT;
1819                         buf[len] = 0;
1820                         p = buf;
1821                         if (*p == '-' && left > 1) {
1822                                 neg = 1;
1823                                 left--, p++;
1824                         }
1825                         if (*p < '0' || *p > '9')
1826                                 break;
1827                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1828                         len = p-buf;
1829                         if ((len < left) && *p && !isspace(*p))
1830                                 break;
1831                         if (neg)
1832                                 val = -val;
1833                         s += len;
1834                         left -= len;
1835
1836                         if(neg)
1837                                 continue;
1838                         if ((min && val < *min) || (max && val > *max))
1839                                 continue;
1840                         *i = val;
1841                 } else {
1842                         p = buf;
1843                         if (!first)
1844                                 *p++ = '\t';
1845                         sprintf(p, "%lu", convdiv * (*i) / convmul);
1846                         len = strlen(buf);
1847                         if (len > left)
1848                                 len = left;
1849                         if(copy_to_user(s, buf, len))
1850                                 return -EFAULT;
1851                         left -= len;
1852                         s += len;
1853                 }
1854         }
1855
1856         if (!write && !first && left) {
1857                 if(put_user('\n', s))
1858                         return -EFAULT;
1859                 left--, s++;
1860         }
1861         if (write) {
1862                 while (left) {
1863                         char c;
1864                         if (get_user(c, s++))
1865                                 return -EFAULT;
1866                         if (!isspace(c))
1867                                 break;
1868                         left--;
1869                 }
1870         }
1871         if (write && first)
1872                 return -EINVAL;
1873         *lenp -= left;
1874         *ppos += *lenp;
1875         return 0;
1876 #undef TMPBUFLEN
1877 }
1878
1879 /**
1880  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1881  * @table: the sysctl table
1882  * @write: %TRUE if this is a write to the sysctl file
1883  * @filp: the file structure
1884  * @buffer: the user buffer
1885  * @lenp: the size of the user buffer
1886  *
1887  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1888  * values from/to the user buffer, treated as an ASCII string.
1889  *
1890  * This routine will ensure the values are within the range specified by
1891  * table->extra1 (min) and table->extra2 (max).
1892  *
1893  * Returns 0 on success.
1894  */
1895 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1896                            void __user *buffer, size_t *lenp, loff_t *ppos)
1897 {
1898     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1899 }
1900
1901 /**
1902  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1903  * @table: the sysctl table
1904  * @write: %TRUE if this is a write to the sysctl file
1905  * @filp: the file structure
1906  * @buffer: the user buffer
1907  * @lenp: the size of the user buffer
1908  *
1909  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1910  * values from/to the user buffer, treated as an ASCII string. The values
1911  * are treated as milliseconds, and converted to jiffies when they are stored.
1912  *
1913  * This routine will ensure the values are within the range specified by
1914  * table->extra1 (min) and table->extra2 (max).
1915  *
1916  * Returns 0 on success.
1917  */
1918 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1919                                       struct file *filp,
1920                                       void __user *buffer,
1921                                       size_t *lenp, loff_t *ppos)
1922 {
1923     return do_proc_doulongvec_minmax(table, write, filp, buffer,
1924                                      lenp, ppos, HZ, 1000l);
1925 }
1926
1927
1928 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
1929                                          int *valp,
1930                                          int write, void *data)
1931 {
1932         if (write) {
1933                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1934         } else {
1935                 int val = *valp;
1936                 unsigned long lval;
1937                 if (val < 0) {
1938                         *negp = -1;
1939                         lval = (unsigned long)-val;
1940                 } else {
1941                         *negp = 0;
1942                         lval = (unsigned long)val;
1943                 }
1944                 *lvalp = lval / HZ;
1945         }
1946         return 0;
1947 }
1948
1949 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
1950                                                 int *valp,
1951                                                 int write, void *data)
1952 {
1953         if (write) {
1954                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1955         } else {
1956                 int val = *valp;
1957                 unsigned long lval;
1958                 if (val < 0) {
1959                         *negp = -1;
1960                         lval = (unsigned long)-val;
1961                 } else {
1962                         *negp = 0;
1963                         lval = (unsigned long)val;
1964                 }
1965                 *lvalp = jiffies_to_clock_t(lval);
1966         }
1967         return 0;
1968 }
1969
1970 /**
1971  * proc_dointvec_jiffies - read a vector of integers as seconds
1972  * @table: the sysctl table
1973  * @write: %TRUE if this is a write to the sysctl file
1974  * @filp: the file structure
1975  * @buffer: the user buffer
1976  * @lenp: the size of the user buffer
1977  *
1978  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1979  * values from/to the user buffer, treated as an ASCII string.
1980  * The values read are assumed to be in seconds, and are converted into
1981  * jiffies.
1982  *
1983  * Returns 0 on success.
1984  */
1985 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
1986                           void __user *buffer, size_t *lenp, loff_t *ppos)
1987 {
1988     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1989                             do_proc_dointvec_jiffies_conv,NULL);
1990 }
1991
1992 /**
1993  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1994  * @table: the sysctl table
1995  * @write: %TRUE if this is a write to the sysctl file
1996  * @filp: the file structure
1997  * @buffer: the user buffer
1998  * @lenp: the size of the user buffer
1999  *
2000  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2001  * values from/to the user buffer, treated as an ASCII string.
2002  * The values read are assumed to be in 1/USER_HZ seconds, and
2003  * are converted into jiffies.
2004  *
2005  * Returns 0 on success.
2006  */
2007 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2008                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2009 {
2010     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2011                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2012 }
2013
2014 #else /* CONFIG_PROC_FS */
2015
2016 int proc_dostring(ctl_table *table, int write, struct file *filp,
2017                   void __user *buffer, size_t *lenp, loff_t *ppos)
2018 {
2019         return -ENOSYS;
2020 }
2021
2022 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2023                             void __user *buffer, size_t *lenp, loff_t *ppos)
2024 {
2025         return -ENOSYS;
2026 }
2027
2028 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2029                   void __user *buffer, size_t *lenp, loff_t *ppos)
2030 {
2031         return -ENOSYS;
2032 }
2033
2034 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2035                         void __user *buffer, size_t *lenp, loff_t *ppos)
2036 {
2037         return -ENOSYS;
2038 }
2039
2040 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2041                     void __user *buffer, size_t *lenp, loff_t *ppos)
2042 {
2043         return -ENOSYS;
2044 }
2045
2046 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2047                     void __user *buffer, size_t *lenp, loff_t *ppos)
2048 {
2049         return -ENOSYS;
2050 }
2051
2052 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2053                     void __user *buffer, size_t *lenp, loff_t *ppos)
2054 {
2055         return -ENOSYS;
2056 }
2057
2058 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2059                     void __user *buffer, size_t *lenp, loff_t *ppos)
2060 {
2061         return -ENOSYS;
2062 }
2063
2064 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2065                                       struct file *filp,
2066                                       void __user *buffer,
2067                                       size_t *lenp, loff_t *ppos)
2068 {
2069     return -ENOSYS;
2070 }
2071
2072
2073 #endif /* CONFIG_PROC_FS */
2074
2075
2076 /*
2077  * General sysctl support routines
2078  */
2079
2080 /* The generic string strategy routine: */
2081 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2082                   void __user *oldval, size_t __user *oldlenp,
2083                   void __user *newval, size_t newlen, void **context)
2084 {
2085         size_t l, len;
2086
2087         if (!table->data || !table->maxlen)
2088                 return -ENOTDIR;
2089
2090         if (oldval && oldlenp) {
2091                 if (get_user(len, oldlenp))
2092                         return -EFAULT;
2093                 if (len) {
2094                         l = strlen(table->data);
2095                         if (len > l) len = l;
2096                         if (len >= table->maxlen)
2097                                 len = table->maxlen;
2098                         if(copy_to_user(oldval, table->data, len))
2099                                 return -EFAULT;
2100                         if(put_user(0, ((char __user *) oldval) + len))
2101                                 return -EFAULT;
2102                         if(put_user(len, oldlenp))
2103                                 return -EFAULT;
2104                 }
2105         }
2106         if (newval && newlen) {
2107                 len = newlen;
2108                 if (len > table->maxlen)
2109                         len = table->maxlen;
2110                 if(copy_from_user(table->data, newval, len))
2111                         return -EFAULT;
2112                 if (len == table->maxlen)
2113                         len--;
2114                 ((char *) table->data)[len] = 0;
2115         }
2116         return 0;
2117 }
2118
2119 /*
2120  * This function makes sure that all of the integers in the vector
2121  * are between the minimum and maximum values given in the arrays
2122  * table->extra1 and table->extra2, respectively.
2123  */
2124 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2125                 void __user *oldval, size_t __user *oldlenp,
2126                 void __user *newval, size_t newlen, void **context)
2127 {
2128
2129         if (newval && newlen) {
2130                 int __user *vec = (int __user *) newval;
2131                 int *min = (int *) table->extra1;
2132                 int *max = (int *) table->extra2;
2133                 size_t length;
2134                 int i;
2135
2136                 if (newlen % sizeof(int) != 0)
2137                         return -EINVAL;
2138
2139                 if (!table->extra1 && !table->extra2)
2140                         return 0;
2141
2142                 if (newlen > table->maxlen)
2143                         newlen = table->maxlen;
2144                 length = newlen / sizeof(int);
2145
2146                 for (i = 0; i < length; i++) {
2147                         int value;
2148                         if (get_user(value, vec + i))
2149                                 return -EFAULT;
2150                         if (min && value < min[i])
2151                                 return -EINVAL;
2152                         if (max && value > max[i])
2153                                 return -EINVAL;
2154                 }
2155         }
2156         return 0;
2157 }
2158
2159 /* Strategy function to convert jiffies to seconds */
2160 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2161                 void __user *oldval, size_t __user *oldlenp,
2162                 void __user *newval, size_t newlen, void **context)
2163 {
2164         if (oldval) {
2165                 size_t olen;
2166                 if (oldlenp) {
2167                         if (get_user(olen, oldlenp))
2168                                 return -EFAULT;
2169                         if (olen!=sizeof(int))
2170                                 return -EINVAL;
2171                 }
2172                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2173                     (oldlenp && put_user(sizeof(int),oldlenp)))
2174                         return -EFAULT;
2175         }
2176         if (newval && newlen) {
2177                 int new;
2178                 if (newlen != sizeof(int))
2179                         return -EINVAL;
2180                 if (get_user(new, (int __user *)newval))
2181                         return -EFAULT;
2182                 *(int *)(table->data) = new*HZ;
2183         }
2184         return 1;
2185 }
2186
2187
2188 #else /* CONFIG_SYSCTL */
2189
2190
2191 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2192 {
2193         return -ENOSYS;
2194 }
2195
2196 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2197                   void __user *oldval, size_t __user *oldlenp,
2198                   void __user *newval, size_t newlen, void **context)
2199 {
2200         return -ENOSYS;
2201 }
2202
2203 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2204                 void __user *oldval, size_t __user *oldlenp,
2205                 void __user *newval, size_t newlen, void **context)
2206 {
2207         return -ENOSYS;
2208 }
2209
2210 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2211                 void __user *oldval, size_t __user *oldlenp,
2212                 void __user *newval, size_t newlen, void **context)
2213 {
2214         return -ENOSYS;
2215 }
2216
2217 int proc_dostring(ctl_table *table, int write, struct file *filp,
2218                   void __user *buffer, size_t *lenp, loff_t *ppos)
2219 {
2220         return -ENOSYS;
2221 }
2222
2223 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2224                   void __user *buffer, size_t *lenp, loff_t *ppos)
2225 {
2226         return -ENOSYS;
2227 }
2228
2229 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2230                         void __user *buffer, size_t *lenp, loff_t *ppos)
2231 {
2232         return -ENOSYS;
2233 }
2234
2235 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2236                     void __user *buffer, size_t *lenp, loff_t *ppos)
2237 {
2238         return -ENOSYS;
2239 }
2240
2241 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2242                           void __user *buffer, size_t *lenp, loff_t *ppos)
2243 {
2244         return -ENOSYS;
2245 }
2246
2247 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2248                           void __user *buffer, size_t *lenp, loff_t *ppos)
2249 {
2250         return -ENOSYS;
2251 }
2252
2253 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2254                     void __user *buffer, size_t *lenp, loff_t *ppos)
2255 {
2256         return -ENOSYS;
2257 }
2258
2259 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2260                                       struct file *filp,
2261                                       void __user *buffer,
2262                                       size_t *lenp, loff_t *ppos)
2263 {
2264     return -ENOSYS;
2265 }
2266
2267 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2268                                                 int insert_at_head)
2269 {
2270         return NULL;
2271 }
2272
2273 void unregister_sysctl_table(struct ctl_table_header * table)
2274 {
2275 }
2276
2277 #endif /* CONFIG_SYSCTL */
2278
2279 /*
2280  * No sense putting this after each symbol definition, twice,
2281  * exception granted :-)
2282  */
2283 EXPORT_SYMBOL(proc_dointvec);
2284 EXPORT_SYMBOL(proc_dointvec_jiffies);
2285 EXPORT_SYMBOL(proc_dointvec_minmax);
2286 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2287 EXPORT_SYMBOL(proc_dostring);
2288 EXPORT_SYMBOL(proc_doulongvec_minmax);
2289 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2290 EXPORT_SYMBOL(register_sysctl_table);
2291 EXPORT_SYMBOL(sysctl_intvec);
2292 EXPORT_SYMBOL(sysctl_jiffies);
2293 EXPORT_SYMBOL(sysctl_string);
2294 EXPORT_SYMBOL(unregister_sysctl_table);