kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/capability.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/capability.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kobject.h>
  35 #include <linux/net.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/highuid.h>
  38 #include <linux/writeback.h>
  39 #include <linux/hugetlb.h>
  40 #include <linux/security.h>
  41 #include <linux/initrd.h>
  42 #include <linux/times.h>
  43 #include <linux/limits.h>
  44 #include <linux/dcache.h>
  45 #include <linux/syscalls.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/acpi.h>
  48
  49 #include <asm/uaccess.h>
  50 #include <asm/processor.h>
  51
  52 extern int proc_nr_files(ctl_table *table, int write, struct file *filp,
  53                      void __user *buffer, size_t *lenp, loff_t *ppos);
  54
  55 #ifdef CONFIG_X86
  56 #include <asm/nmi.h>
  57 #endif
  58
  59 #if defined(CONFIG_SYSCTL)
  60
  61 /* External variables not in a header file. */
  62 extern int C_A_D;
  63 extern int sysctl_overcommit_memory;
  64 extern int sysctl_overcommit_ratio;
  65 extern int sysctl_panic_on_oom;
  66 extern int max_threads;
  67 extern int sysrq_enabled;
  68 extern int core_uses_pid;
  69 extern int suid_dumpable;
  70 extern char core_pattern[];
  71 extern int pid_max;
  72 extern int min_free_kbytes;
  73 extern int printk_ratelimit_jiffies;
  74 extern int printk_ratelimit_burst;
  75 extern int pid_max_min, pid_max_max;
  76 extern int sysctl_drop_caches;
  77 extern int percpu_pagelist_fraction;
  78 extern int compat_log;
  79
  80 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
  81 static int maxolduid = 65535;
  82 static int minolduid;
  83 static int min_percpu_pagelist_fract = 8;
  84
  85 static int ngroups_max = NGROUPS_MAX;
  86
  87 #ifdef CONFIG_KMOD
  88 extern char modprobe_path[];
  89 #endif
  90 #ifdef CONFIG_CHR_DEV_SG
  91 extern int sg_big_buff;
  92 #endif
  93 #ifdef CONFIG_SYSVIPC
  94 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
  95                 void __user *buffer, size_t *lenp, loff_t *ppos);
  96 #endif
  97
  98 #ifdef __sparc__
  99 extern char reboot_command [];
 100 extern int stop_a_enabled;
 101 extern int scons_pwroff;
 102 #endif
 103
 104 #ifdef __hppa__
 105 extern int pwrsw_enabled;
 106 extern int unaligned_enabled;
 107 #endif
 108
 109 #ifdef CONFIG_S390
 110 #ifdef CONFIG_MATHEMU
 111 extern int sysctl_ieee_emulation_warnings;
 112 #endif
 113 extern int sysctl_userprocess_debug;
 114 extern int spin_retry;
 115 #endif
 116
 117 extern int sysctl_hz_timer;
 118
 119 #ifdef CONFIG_BSD_PROCESS_ACCT
 120 extern int acct_parm[];
 121 #endif
 122
 123 #ifdef CONFIG_IA64
 124 extern int no_unaligned_warning;
 125 #endif
 126
 127 #ifdef CONFIG_RT_MUTEXES
 128 extern int max_lock_depth;
 129 #endif
 130
 131 #ifdef CONFIG_SYSCTL_SYSCALL
 132 static int parse_table(int __user *, int, void __user *, size_t __user *,
 133                 void __user *, size_t, ctl_table *, void **);
 134 #endif
 135
 136 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
 137                   void __user *buffer, size_t *lenp, loff_t *ppos);
 138
 139 #ifdef CONFIG_PROC_SYSCTL
 140 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
 141                   void __user *buffer, size_t *lenp, loff_t *ppos);
 142 #endif
 143
 144 static ctl_table root_table[];
 145 static struct ctl_table_header root_table_header =
 146         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 147
 148 static ctl_table kern_table[];
 149 static ctl_table vm_table[];
 150 static ctl_table fs_table[];
 151 static ctl_table debug_table[];
 152 static ctl_table dev_table[];
 153 extern ctl_table random_table[];
 154 #ifdef CONFIG_UNIX98_PTYS
 155 extern ctl_table pty_table[];
 156 #endif
 157 #ifdef CONFIG_INOTIFY_USER
 158 extern ctl_table inotify_table[];
 159 #endif
 160
 161 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 162 int sysctl_legacy_va_layout;
 163 #endif
 164
 165 /* /proc declarations: */
 166
 167 #ifdef CONFIG_PROC_SYSCTL
 168
 169 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
 170 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
 171 static int proc_opensys(struct inode *, struct file *);
 172
 173 struct file_operations proc_sys_file_operations = {
 174         .open           = proc_opensys,
 175         .read           = proc_readsys,
 176         .write          = proc_writesys,
 177 };
 178
 179 extern struct proc_dir_entry *proc_sys_root;
 180
 181 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
 182 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
 183 #endif
 184
 185 /* The default sysctl tables: */
 186
 187 static ctl_table root_table[] = {
 188         {
 189                 .ctl_name       = CTL_KERN,
 190                 .procname       = "kernel",
 191                 .mode           = 0555,
 192                 .child          = kern_table,
 193         },
 194         {
 195                 .ctl_name       = CTL_VM,
 196                 .procname       = "vm",
 197                 .mode           = 0555,
 198                 .child          = vm_table,
 199         },
 200 #ifdef CONFIG_NET
 201         {
 202                 .ctl_name       = CTL_NET,
 203                 .procname       = "net",
 204                 .mode           = 0555,
 205                 .child          = net_table,
 206         },
 207 #endif
 208         {
 209                 .ctl_name       = CTL_FS,
 210                 .procname       = "fs",
 211                 .mode           = 0555,
 212                 .child          = fs_table,
 213         },
 214         {
 215                 .ctl_name       = CTL_DEBUG,
 216                 .procname       = "debug",
 217                 .mode           = 0555,
 218                 .child          = debug_table,
 219         },
 220         {
 221                 .ctl_name       = CTL_DEV,
 222                 .procname       = "dev",
 223                 .mode           = 0555,
 224                 .child          = dev_table,
 225         },
 226
 227         { .ctl_name = 0 }
 228 };
 229
 230 static ctl_table kern_table[] = {
 231 #ifndef CONFIG_UTS_NS
 232         {
 233                 .ctl_name       = KERN_OSTYPE,
 234                 .procname       = "ostype",
 235                 .data           = init_uts_ns.name.sysname,
 236                 .maxlen         = sizeof(init_uts_ns.name.sysname),
 237                 .mode           = 0444,
 238                 .proc_handler   = &proc_do_uts_string,
 239                 .strategy       = &sysctl_string,
 240         },
 241         {
 242                 .ctl_name       = KERN_OSRELEASE,
 243                 .procname       = "osrelease",
 244                 .data           = init_uts_ns.name.release,
 245                 .maxlen         = sizeof(init_uts_ns.name.release),
 246                 .mode           = 0444,
 247                 .proc_handler   = &proc_do_uts_string,
 248                 .strategy       = &sysctl_string,
 249         },
 250         {
 251                 .ctl_name       = KERN_VERSION,
 252                 .procname       = "version",
 253                 .data           = init_uts_ns.name.version,
 254                 .maxlen         = sizeof(init_uts_ns.name.version),
 255                 .mode           = 0444,
 256                 .proc_handler   = &proc_do_uts_string,
 257                 .strategy       = &sysctl_string,
 258         },
 259         {
 260                 .ctl_name       = KERN_NODENAME,
 261                 .procname       = "hostname",
 262                 .data           = init_uts_ns.name.nodename,
 263                 .maxlen         = sizeof(init_uts_ns.name.nodename),
 264                 .mode           = 0644,
 265                 .proc_handler   = &proc_do_uts_string,
 266                 .strategy       = &sysctl_string,
 267         },
 268         {
 269                 .ctl_name       = KERN_DOMAINNAME,
 270                 .procname       = "domainname",
 271                 .data           = init_uts_ns.name.domainname,
 272                 .maxlen         = sizeof(init_uts_ns.name.domainname),
 273                 .mode           = 0644,
 274                 .proc_handler   = &proc_do_uts_string,
 275                 .strategy       = &sysctl_string,
 276         },
 277 #else  /* !CONFIG_UTS_NS */
 278         {
 279                 .ctl_name       = KERN_OSTYPE,
 280                 .procname       = "ostype",
 281                 .data           = NULL,
 282                 /* could maybe use __NEW_UTS_LEN here? */
 283                 .maxlen         = FIELD_SIZEOF(struct new_utsname, sysname),
 284                 .mode           = 0444,
 285                 .proc_handler   = &proc_do_uts_string,
 286                 .strategy       = &sysctl_string,
 287         },
 288         {
 289                 .ctl_name       = KERN_OSRELEASE,
 290                 .procname       = "osrelease",
 291                 .data           = NULL,
 292                 .maxlen         = FIELD_SIZEOF(struct new_utsname, release),
 293                 .mode           = 0444,
 294                 .proc_handler   = &proc_do_uts_string,
 295                 .strategy       = &sysctl_string,
 296         },
 297         {
 298                 .ctl_name       = KERN_VERSION,
 299                 .procname       = "version",
 300                 .data           = NULL,
 301                 .maxlen         = FIELD_SIZEOF(struct new_utsname, version),
 302                 .mode           = 0444,
 303                 .proc_handler   = &proc_do_uts_string,
 304                 .strategy       = &sysctl_string,
 305         },
 306         {
 307                 .ctl_name       = KERN_NODENAME,
 308                 .procname       = "hostname",
 309                 .data           = NULL,
 310                 .maxlen         = FIELD_SIZEOF(struct new_utsname, nodename),
 311                 .mode           = 0644,
 312                 .proc_handler   = &proc_do_uts_string,
 313                 .strategy       = &sysctl_string,
 314         },
 315         {
 316                 .ctl_name       = KERN_DOMAINNAME,
 317                 .procname       = "domainname",
 318                 .data           = NULL,
 319                 .maxlen         = FIELD_SIZEOF(struct new_utsname, domainname),
 320                 .mode           = 0644,
 321                 .proc_handler   = &proc_do_uts_string,
 322                 .strategy       = &sysctl_string,
 323         },
 324 #endif /* !CONFIG_UTS_NS */
 325         {
 326                 .ctl_name       = KERN_PANIC,
 327                 .procname       = "panic",
 328                 .data           = &panic_timeout,
 329                 .maxlen         = sizeof(int),
 330                 .mode           = 0644,
 331                 .proc_handler   = &proc_dointvec,
 332         },
 333         {
 334                 .ctl_name       = KERN_CORE_USES_PID,
 335                 .procname       = "core_uses_pid",
 336                 .data           = &core_uses_pid,
 337                 .maxlen         = sizeof(int),
 338                 .mode           = 0644,
 339                 .proc_handler   = &proc_dointvec,
 340         },
 341         {
 342                 .ctl_name       = KERN_CORE_PATTERN,
 343                 .procname       = "core_pattern",
 344                 .data           = core_pattern,
 345                 .maxlen         = 128,
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_dostring,
 348                 .strategy       = &sysctl_string,
 349         },
 350         {
 351                 .ctl_name       = KERN_TAINTED,
 352                 .procname       = "tainted",
 353                 .data           = &tainted,
 354                 .maxlen         = sizeof(int),
 355                 .mode           = 0444,
 356                 .proc_handler   = &proc_dointvec,
 357         },
 358         {
 359                 .ctl_name       = KERN_CAP_BSET,
 360                 .procname       = "cap-bound",
 361                 .data           = &cap_bset,
 362                 .maxlen         = sizeof(kernel_cap_t),
 363                 .mode           = 0600,
 364                 .proc_handler   = &proc_dointvec_bset,
 365         },
 366 #ifdef CONFIG_BLK_DEV_INITRD
 367         {
 368                 .ctl_name       = KERN_REALROOTDEV,
 369                 .procname       = "real-root-dev",
 370                 .data           = &real_root_dev,
 371                 .maxlen         = sizeof(int),
 372                 .mode           = 0644,
 373                 .proc_handler   = &proc_dointvec,
 374         },
 375 #endif
 376 #ifdef __sparc__
 377         {
 378                 .ctl_name       = KERN_SPARC_REBOOT,
 379                 .procname       = "reboot-cmd",
 380                 .data           = reboot_command,
 381                 .maxlen         = 256,
 382                 .mode           = 0644,
 383                 .proc_handler   = &proc_dostring,
 384                 .strategy       = &sysctl_string,
 385         },
 386         {
 387                 .ctl_name       = KERN_SPARC_STOP_A,
 388                 .procname       = "stop-a",
 389                 .data           = &stop_a_enabled,
 390                 .maxlen         = sizeof (int),
 391                 .mode           = 0644,
 392                 .proc_handler   = &proc_dointvec,
 393         },
 394         {
 395                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 396                 .procname       = "scons-poweroff",
 397                 .data           = &scons_pwroff,
 398                 .maxlen         = sizeof (int),
 399                 .mode           = 0644,
 400                 .proc_handler   = &proc_dointvec,
 401         },
 402 #endif
 403 #ifdef __hppa__
 404         {
 405                 .ctl_name       = KERN_HPPA_PWRSW,
 406                 .procname       = "soft-power",
 407                 .data           = &pwrsw_enabled,
 408                 .maxlen         = sizeof (int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec,
 411         },
 412         {
 413                 .ctl_name       = KERN_HPPA_UNALIGNED,
 414                 .procname       = "unaligned-trap",
 415                 .data           = &unaligned_enabled,
 416                 .maxlen         = sizeof (int),
 417                 .mode           = 0644,
 418                 .proc_handler   = &proc_dointvec,
 419         },
 420 #endif
 421         {
 422                 .ctl_name       = KERN_CTLALTDEL,
 423                 .procname       = "ctrl-alt-del",
 424                 .data           = &C_A_D,
 425                 .maxlen         = sizeof(int),
 426                 .mode           = 0644,
 427                 .proc_handler   = &proc_dointvec,
 428         },
 429         {
 430                 .ctl_name       = KERN_PRINTK,
 431                 .procname       = "printk",
 432                 .data           = &console_loglevel,
 433                 .maxlen         = 4*sizeof(int),
 434                 .mode           = 0644,
 435                 .proc_handler   = &proc_dointvec,
 436         },
 437 #ifdef CONFIG_KMOD
 438         {
 439                 .ctl_name       = KERN_MODPROBE,
 440                 .procname       = "modprobe",
 441                 .data           = &modprobe_path,
 442                 .maxlen         = KMOD_PATH_LEN,
 443                 .mode           = 0644,
 444                 .proc_handler   = &proc_dostring,
 445                 .strategy       = &sysctl_string,
 446         },
 447 #endif
 448 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 449         {
 450                 .ctl_name       = KERN_HOTPLUG,
 451                 .procname       = "hotplug",
 452                 .data           = &uevent_helper,
 453                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dostring,
 456                 .strategy       = &sysctl_string,
 457         },
 458 #endif
 459 #ifdef CONFIG_CHR_DEV_SG
 460         {
 461                 .ctl_name       = KERN_SG_BIG_BUFF,
 462                 .procname       = "sg-big-buff",
 463                 .data           = &sg_big_buff,
 464                 .maxlen         = sizeof (int),
 465                 .mode           = 0444,
 466                 .proc_handler   = &proc_dointvec,
 467         },
 468 #endif
 469 #ifdef CONFIG_BSD_PROCESS_ACCT
 470         {
 471                 .ctl_name       = KERN_ACCT,
 472                 .procname       = "acct",
 473                 .data           = &acct_parm,
 474                 .maxlen         = 3*sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = &proc_dointvec,
 477         },
 478 #endif
 479 #ifdef CONFIG_SYSVIPC
 480         {
 481                 .ctl_name       = KERN_SHMMAX,
 482                 .procname       = "shmmax",
 483                 .data           = NULL,
 484                 .maxlen         = sizeof (size_t),
 485                 .mode           = 0644,
 486                 .proc_handler   = &proc_do_ipc_string,
 487         },
 488         {
 489                 .ctl_name       = KERN_SHMALL,
 490                 .procname       = "shmall",
 491                 .data           = NULL,
 492                 .maxlen         = sizeof (size_t),
 493                 .mode           = 0644,
 494                 .proc_handler   = &proc_do_ipc_string,
 495         },
 496         {
 497                 .ctl_name       = KERN_SHMMNI,
 498                 .procname       = "shmmni",
 499                 .data           = NULL,
 500                 .maxlen         = sizeof (int),
 501                 .mode           = 0644,
 502                 .proc_handler   = &proc_do_ipc_string,
 503         },
 504         {
 505                 .ctl_name       = KERN_MSGMAX,
 506                 .procname       = "msgmax",
 507                 .data           = NULL,
 508                 .maxlen         = sizeof (int),
 509                 .mode           = 0644,
 510                 .proc_handler   = &proc_do_ipc_string,
 511         },
 512         {
 513                 .ctl_name       = KERN_MSGMNI,
 514                 .procname       = "msgmni",
 515                 .data           = NULL,
 516                 .maxlen         = sizeof (int),
 517                 .mode           = 0644,
 518                 .proc_handler   = &proc_do_ipc_string,
 519         },
 520         {
 521                 .ctl_name       = KERN_MSGMNB,
 522                 .procname       =  "msgmnb",
 523                 .data           = NULL,
 524                 .maxlen         = sizeof (int),
 525                 .mode           = 0644,
 526                 .proc_handler   = &proc_do_ipc_string,
 527         },
 528         {
 529                 .ctl_name       = KERN_SEM,
 530                 .procname       = "sem",
 531                 .data           = NULL,
 532                 .maxlen         = 4*sizeof (int),
 533                 .mode           = 0644,
 534                 .proc_handler   = &proc_do_ipc_string,
 535         },
 536 #endif
 537 #ifdef CONFIG_MAGIC_SYSRQ
 538         {
 539                 .ctl_name       = KERN_SYSRQ,
 540                 .procname       = "sysrq",
 541                 .data           = &sysrq_enabled,
 542                 .maxlen         = sizeof (int),
 543                 .mode           = 0644,
 544                 .proc_handler   = &proc_dointvec,
 545         },
 546 #endif
 547 #ifdef CONFIG_PROC_SYSCTL
 548         {
 549                 .ctl_name       = KERN_CADPID,
 550                 .procname       = "cad_pid",
 551                 .data           = NULL,
 552                 .maxlen         = sizeof (int),
 553                 .mode           = 0600,
 554                 .proc_handler   = &proc_do_cad_pid,
 555         },
 556 #endif
 557         {
 558                 .ctl_name       = KERN_MAX_THREADS,
 559                 .procname       = "threads-max",
 560                 .data           = &max_threads,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec,
 564         },
 565         {
 566                 .ctl_name       = KERN_RANDOM,
 567                 .procname       = "random",
 568                 .mode           = 0555,
 569                 .child          = random_table,
 570         },
 571 #ifdef CONFIG_UNIX98_PTYS
 572         {
 573                 .ctl_name       = KERN_PTY,
 574                 .procname       = "pty",
 575                 .mode           = 0555,
 576                 .child          = pty_table,
 577         },
 578 #endif
 579         {
 580                 .ctl_name       = KERN_OVERFLOWUID,
 581                 .procname       = "overflowuid",
 582                 .data           = &overflowuid,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec_minmax,
 586                 .strategy       = &sysctl_intvec,
 587                 .extra1         = &minolduid,
 588                 .extra2         = &maxolduid,
 589         },
 590         {
 591                 .ctl_name       = KERN_OVERFLOWGID,
 592                 .procname       = "overflowgid",
 593                 .data           = &overflowgid,
 594                 .maxlen         = sizeof(int),
 595                 .mode           = 0644,
 596                 .proc_handler   = &proc_dointvec_minmax,
 597                 .strategy       = &sysctl_intvec,
 598                 .extra1         = &minolduid,
 599                 .extra2         = &maxolduid,
 600         },
 601 #ifdef CONFIG_S390
 602 #ifdef CONFIG_MATHEMU
 603         {
 604                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 605                 .procname       = "ieee_emulation_warnings",
 606                 .data           = &sysctl_ieee_emulation_warnings,
 607                 .maxlen         = sizeof(int),
 608                 .mode           = 0644,
 609                 .proc_handler   = &proc_dointvec,
 610         },
 611 #endif
 612 #ifdef CONFIG_NO_IDLE_HZ
 613         {
 614                 .ctl_name       = KERN_HZ_TIMER,
 615                 .procname       = "hz_timer",
 616                 .data           = &sysctl_hz_timer,
 617                 .maxlen         = sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec,
 620         },
 621 #endif
 622         {
 623                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 624                 .procname       = "userprocess_debug",
 625                 .data           = &sysctl_userprocess_debug,
 626                 .maxlen         = sizeof(int),
 627                 .mode           = 0644,
 628                 .proc_handler   = &proc_dointvec,
 629         },
 630 #endif
 631         {
 632                 .ctl_name       = KERN_PIDMAX,
 633                 .procname       = "pid_max",
 634                 .data           = &pid_max,
 635                 .maxlen         = sizeof (int),
 636                 .mode           = 0644,
 637                 .proc_handler   = &proc_dointvec_minmax,
 638                 .strategy       = sysctl_intvec,
 639                 .extra1         = &pid_max_min,
 640                 .extra2         = &pid_max_max,
 641         },
 642         {
 643                 .ctl_name       = KERN_PANIC_ON_OOPS,
 644                 .procname       = "panic_on_oops",
 645                 .data           = &panic_on_oops,
 646                 .maxlen         = sizeof(int),
 647                 .mode           = 0644,
 648                 .proc_handler   = &proc_dointvec,
 649         },
 650         {
 651                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 652                 .procname       = "printk_ratelimit",
 653                 .data           = &printk_ratelimit_jiffies,
 654                 .maxlen         = sizeof(int),
 655                 .mode           = 0644,
 656                 .proc_handler   = &proc_dointvec_jiffies,
 657                 .strategy       = &sysctl_jiffies,
 658         },
 659         {
 660                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 661                 .procname       = "printk_ratelimit_burst",
 662                 .data           = &printk_ratelimit_burst,
 663                 .maxlen         = sizeof(int),
 664                 .mode           = 0644,
 665                 .proc_handler   = &proc_dointvec,
 666         },
 667         {
 668                 .ctl_name       = KERN_NGROUPS_MAX,
 669                 .procname       = "ngroups_max",
 670                 .data           = &ngroups_max,
 671                 .maxlen         = sizeof (int),
 672                 .mode           = 0444,
 673                 .proc_handler   = &proc_dointvec,
 674         },
 675 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 676         {
 677                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 678                 .procname       = "unknown_nmi_panic",
 679                 .data           = &unknown_nmi_panic,
 680                 .maxlen         = sizeof (int),
 681                 .mode           = 0644,
 682                 .proc_handler   = &proc_dointvec,
 683         },
 684         {
 685                 .ctl_name       = KERN_NMI_WATCHDOG,
 686                 .procname       = "nmi_watchdog",
 687                 .data           = &nmi_watchdog_enabled,
 688                 .maxlen         = sizeof (int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_nmi_enabled,
 691         },
 692 #endif
 693 #if defined(CONFIG_X86)
 694         {
 695                 .ctl_name       = KERN_PANIC_ON_NMI,
 696                 .procname       = "panic_on_unrecovered_nmi",
 697                 .data           = &panic_on_unrecovered_nmi,
 698                 .maxlen         = sizeof(int),
 699                 .mode           = 0644,
 700                 .proc_handler   = &proc_dointvec,
 701         },
 702         {
 703                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 704                 .procname       = "bootloader_type",
 705                 .data           = &bootloader_type,
 706                 .maxlen         = sizeof (int),
 707                 .mode           = 0444,
 708                 .proc_handler   = &proc_dointvec,
 709         },
 710 #endif
 711 #if defined(CONFIG_MMU)
 712         {
 713                 .ctl_name       = KERN_RANDOMIZE,
 714                 .procname       = "randomize_va_space",
 715                 .data           = &randomize_va_space,
 716                 .maxlen         = sizeof(int),
 717                 .mode           = 0644,
 718                 .proc_handler   = &proc_dointvec,
 719         },
 720 #endif
 721 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 722         {
 723                 .ctl_name       = KERN_SPIN_RETRY,
 724                 .procname       = "spin_retry",
 725                 .data           = &spin_retry,
 726                 .maxlen         = sizeof (int),
 727                 .mode           = 0644,
 728                 .proc_handler   = &proc_dointvec,
 729         },
 730 #endif
 731 #ifdef CONFIG_ACPI_SLEEP
 732         {
 733                 .ctl_name       = KERN_ACPI_VIDEO_FLAGS,
 734                 .procname       = "acpi_video_flags",
 735                 .data           = &acpi_video_flags,
 736                 .maxlen         = sizeof (unsigned long),
 737                 .mode           = 0644,
 738                 .proc_handler   = &proc_doulongvec_minmax,
 739         },
 740 #endif
 741 #ifdef CONFIG_IA64
 742         {
 743                 .ctl_name       = KERN_IA64_UNALIGNED,
 744                 .procname       = "ignore-unaligned-usertrap",
 745                 .data           = &no_unaligned_warning,
 746                 .maxlen         = sizeof (int),
 747                 .mode           = 0644,
 748                 .proc_handler   = &proc_dointvec,
 749         },
 750 #endif
 751 #ifdef CONFIG_COMPAT
 752         {
 753                 .ctl_name       = KERN_COMPAT_LOG,
 754                 .procname       = "compat-log",
 755                 .data           = &compat_log,
 756                 .maxlen         = sizeof (int),
 757                 .mode           = 0644,
 758                 .proc_handler   = &proc_dointvec,
 759         },
 760 #endif
 761 #ifdef CONFIG_RT_MUTEXES
 762         {
 763                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 764                 .procname       = "max_lock_depth",
 765                 .data           = &max_lock_depth,
 766                 .maxlen         = sizeof(int),
 767                 .mode           = 0644,
 768                 .proc_handler   = &proc_dointvec,
 769         },
 770 #endif
 771
 772         { .ctl_name = 0 }
 773 };
 774
 775 /* Constants for minimum and maximum testing in vm_table.
 776    We use these as one-element integer vectors. */
 777 static int zero;
 778 static int one_hundred = 100;
 779
 780
 781 static ctl_table vm_table[] = {
 782         {
 783                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 784                 .procname       = "overcommit_memory",
 785                 .data           = &sysctl_overcommit_memory,
 786                 .maxlen         = sizeof(sysctl_overcommit_memory),
 787                 .mode           = 0644,
 788                 .proc_handler   = &proc_dointvec,
 789         },
 790         {
 791                 .ctl_name       = VM_PANIC_ON_OOM,
 792                 .procname       = "panic_on_oom",
 793                 .data           = &sysctl_panic_on_oom,
 794                 .maxlen         = sizeof(sysctl_panic_on_oom),
 795                 .mode           = 0644,
 796                 .proc_handler   = &proc_dointvec,
 797         },
 798         {
 799                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 800                 .procname       = "overcommit_ratio",
 801                 .data           = &sysctl_overcommit_ratio,
 802                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 803                 .mode           = 0644,
 804                 .proc_handler   = &proc_dointvec,
 805         },
 806         {
 807                 .ctl_name       = VM_PAGE_CLUSTER,
 808                 .procname       = "page-cluster",
 809                 .data           = &page_cluster,
 810                 .maxlen         = sizeof(int),
 811                 .mode           = 0644,
 812                 .proc_handler   = &proc_dointvec,
 813         },
 814         {
 815                 .ctl_name       = VM_DIRTY_BACKGROUND,
 816                 .procname       = "dirty_background_ratio",
 817                 .data           = &dirty_background_ratio,
 818                 .maxlen         = sizeof(dirty_background_ratio),
 819                 .mode           = 0644,
 820                 .proc_handler   = &proc_dointvec_minmax,
 821                 .strategy       = &sysctl_intvec,
 822                 .extra1         = &zero,
 823                 .extra2         = &one_hundred,
 824         },
 825         {
 826                 .ctl_name       = VM_DIRTY_RATIO,
 827                 .procname       = "dirty_ratio",
 828                 .data           = &vm_dirty_ratio,
 829                 .maxlen         = sizeof(vm_dirty_ratio),
 830                 .mode           = 0644,
 831                 .proc_handler   = &proc_dointvec_minmax,
 832                 .strategy       = &sysctl_intvec,
 833                 .extra1         = &zero,
 834                 .extra2         = &one_hundred,
 835         },
 836         {
 837                 .ctl_name       = VM_DIRTY_WB_CS,
 838                 .procname       = "dirty_writeback_centisecs",
 839                 .data           = &dirty_writeback_interval,
 840                 .maxlen         = sizeof(dirty_writeback_interval),
 841                 .mode           = 0644,
 842                 .proc_handler   = &dirty_writeback_centisecs_handler,
 843         },
 844         {
 845                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
 846                 .procname       = "dirty_expire_centisecs",
 847                 .data           = &dirty_expire_interval,
 848                 .maxlen         = sizeof(dirty_expire_interval),
 849                 .mode           = 0644,
 850                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 851         },
 852         {
 853                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 854                 .procname       = "nr_pdflush_threads",
 855                 .data           = &nr_pdflush_threads,
 856                 .maxlen         = sizeof nr_pdflush_threads,
 857                 .mode           = 0444 /* read-only*/,
 858                 .proc_handler   = &proc_dointvec,
 859         },
 860         {
 861                 .ctl_name       = VM_SWAPPINESS,
 862                 .procname       = "swappiness",
 863                 .data           = &vm_swappiness,
 864                 .maxlen         = sizeof(vm_swappiness),
 865                 .mode           = 0644,
 866                 .proc_handler   = &proc_dointvec_minmax,
 867                 .strategy       = &sysctl_intvec,
 868                 .extra1         = &zero,
 869                 .extra2         = &one_hundred,
 870         },
 871 #ifdef CONFIG_HUGETLB_PAGE
 872          {
 873                 .ctl_name       = VM_HUGETLB_PAGES,
 874                 .procname       = "nr_hugepages",
 875                 .data           = &max_huge_pages,
 876                 .maxlen         = sizeof(unsigned long),
 877                 .mode           = 0644,
 878                 .proc_handler   = &hugetlb_sysctl_handler,
 879                 .extra1         = (void *)&hugetlb_zero,
 880                 .extra2         = (void *)&hugetlb_infinity,
 881          },
 882          {
 883                 .ctl_name       = VM_HUGETLB_GROUP,
 884                 .procname       = "hugetlb_shm_group",
 885                 .data           = &sysctl_hugetlb_shm_group,
 886                 .maxlen         = sizeof(gid_t),
 887                 .mode           = 0644,
 888                 .proc_handler   = &proc_dointvec,
 889          },
 890 #endif
 891         {
 892                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 893                 .procname       = "lowmem_reserve_ratio",
 894                 .data           = &sysctl_lowmem_reserve_ratio,
 895                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
 896                 .mode           = 0644,
 897                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
 898                 .strategy       = &sysctl_intvec,
 899         },
 900         {
 901                 .ctl_name       = VM_DROP_PAGECACHE,
 902                 .procname       = "drop_caches",
 903                 .data           = &sysctl_drop_caches,
 904                 .maxlen         = sizeof(int),
 905                 .mode           = 0644,
 906                 .proc_handler   = drop_caches_sysctl_handler,
 907                 .strategy       = &sysctl_intvec,
 908         },
 909         {
 910                 .ctl_name       = VM_MIN_FREE_KBYTES,
 911                 .procname       = "min_free_kbytes",
 912                 .data           = &min_free_kbytes,
 913                 .maxlen         = sizeof(min_free_kbytes),
 914                 .mode           = 0644,
 915                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 916                 .strategy       = &sysctl_intvec,
 917                 .extra1         = &zero,
 918         },
 919         {
 920                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
 921                 .procname       = "percpu_pagelist_fraction",
 922                 .data           = &percpu_pagelist_fraction,
 923                 .maxlen         = sizeof(percpu_pagelist_fraction),
 924                 .mode           = 0644,
 925                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
 926                 .strategy       = &sysctl_intvec,
 927                 .extra1         = &min_percpu_pagelist_fract,
 928         },
 929 #ifdef CONFIG_MMU
 930         {
 931                 .ctl_name       = VM_MAX_MAP_COUNT,
 932                 .procname       = "max_map_count",
 933                 .data           = &sysctl_max_map_count,
 934                 .maxlen         = sizeof(sysctl_max_map_count),
 935                 .mode           = 0644,
 936                 .proc_handler   = &proc_dointvec
 937         },
 938 #endif
 939         {
 940                 .ctl_name       = VM_LAPTOP_MODE,
 941                 .procname       = "laptop_mode",
 942                 .data           = &laptop_mode,
 943                 .maxlen         = sizeof(laptop_mode),
 944                 .mode           = 0644,
 945                 .proc_handler   = &proc_dointvec_jiffies,
 946                 .strategy       = &sysctl_jiffies,
 947         },
 948         {
 949                 .ctl_name       = VM_BLOCK_DUMP,
 950                 .procname       = "block_dump",
 951                 .data           = &block_dump,
 952                 .maxlen         = sizeof(block_dump),
 953                 .mode           = 0644,
 954                 .proc_handler   = &proc_dointvec,
 955                 .strategy       = &sysctl_intvec,
 956                 .extra1         = &zero,
 957         },
 958         {
 959                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 960                 .procname       = "vfs_cache_pressure",
 961                 .data           = &sysctl_vfs_cache_pressure,
 962                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 963                 .mode           = 0644,
 964                 .proc_handler   = &proc_dointvec,
 965                 .strategy       = &sysctl_intvec,
 966                 .extra1         = &zero,
 967         },
 968 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 969         {
 970                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
 971                 .procname       = "legacy_va_layout",
 972                 .data           = &sysctl_legacy_va_layout,
 973                 .maxlen         = sizeof(sysctl_legacy_va_layout),
 974                 .mode           = 0644,
 975                 .proc_handler   = &proc_dointvec,
 976                 .strategy       = &sysctl_intvec,
 977                 .extra1         = &zero,
 978         },
 979 #endif
 980 #ifdef CONFIG_SWAP
 981         {
 982                 .ctl_name       = VM_SWAP_TOKEN_TIMEOUT,
 983                 .procname       = "swap_token_timeout",
 984                 .data           = &swap_token_default_timeout,
 985                 .maxlen         = sizeof(swap_token_default_timeout),
 986                 .mode           = 0644,
 987                 .proc_handler   = &proc_dointvec_jiffies,
 988                 .strategy       = &sysctl_jiffies,
 989         },
 990 #endif
 991 #ifdef CONFIG_NUMA
 992         {
 993                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
 994                 .procname       = "zone_reclaim_mode",
 995                 .data           = &zone_reclaim_mode,
 996                 .maxlen         = sizeof(zone_reclaim_mode),
 997                 .mode           = 0644,
 998                 .proc_handler   = &proc_dointvec,
 999                 .strategy       = &sysctl_intvec,
1000                 .extra1         = &zero,
1001         },
1002         {
1003                 .ctl_name       = VM_MIN_UNMAPPED,
1004                 .procname       = "min_unmapped_ratio",
1005                 .data           = &sysctl_min_unmapped_ratio,
1006                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1007                 .mode           = 0644,
1008                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1009                 .strategy       = &sysctl_intvec,
1010                 .extra1         = &zero,
1011                 .extra2         = &one_hundred,
1012         },
1013         {
1014                 .ctl_name       = VM_MIN_SLAB,
1015                 .procname       = "min_slab_ratio",
1016                 .data           = &sysctl_min_slab_ratio,
1017                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1018                 .mode           = 0644,
1019                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1020                 .strategy       = &sysctl_intvec,
1021                 .extra1         = &zero,
1022                 .extra2         = &one_hundred,
1023         },
1024 #endif
1025 #ifdef CONFIG_X86_32
1026         {
1027                 .ctl_name       = VM_VDSO_ENABLED,
1028                 .procname       = "vdso_enabled",
1029                 .data           = &vdso_enabled,
1030                 .maxlen         = sizeof(vdso_enabled),
1031                 .mode           = 0644,
1032                 .proc_handler   = &proc_dointvec,
1033                 .strategy       = &sysctl_intvec,
1034                 .extra1         = &zero,
1035         },
1036 #endif
1037         { .ctl_name = 0 }
1038 };
1039
1040 static ctl_table fs_table[] = {
1041         {
1042                 .ctl_name       = FS_NRINODE,
1043                 .procname       = "inode-nr",
1044                 .data           = &inodes_stat,
1045                 .maxlen         = 2*sizeof(int),
1046                 .mode           = 0444,
1047                 .proc_handler   = &proc_dointvec,
1048         },
1049         {
1050                 .ctl_name       = FS_STATINODE,
1051                 .procname       = "inode-state",
1052                 .data           = &inodes_stat,
1053                 .maxlen         = 7*sizeof(int),
1054                 .mode           = 0444,
1055                 .proc_handler   = &proc_dointvec,
1056         },
1057         {
1058                 .ctl_name       = FS_NRFILE,
1059                 .procname       = "file-nr",
1060                 .data           = &files_stat,
1061                 .maxlen         = 3*sizeof(int),
1062                 .mode           = 0444,
1063                 .proc_handler   = &proc_nr_files,
1064         },
1065         {
1066                 .ctl_name       = FS_MAXFILE,
1067                 .procname       = "file-max",
1068                 .data           = &files_stat.max_files,
1069                 .maxlen         = sizeof(int),
1070                 .mode           = 0644,
1071                 .proc_handler   = &proc_dointvec,
1072         },
1073         {
1074                 .ctl_name       = FS_DENTRY,
1075                 .procname       = "dentry-state",
1076                 .data           = &dentry_stat,
1077                 .maxlen         = 6*sizeof(int),
1078                 .mode           = 0444,
1079                 .proc_handler   = &proc_dointvec,
1080         },
1081         {
1082                 .ctl_name       = FS_OVERFLOWUID,
1083                 .procname       = "overflowuid",
1084                 .data           = &fs_overflowuid,
1085                 .maxlen         = sizeof(int),
1086                 .mode           = 0644,
1087                 .proc_handler   = &proc_dointvec_minmax,
1088                 .strategy       = &sysctl_intvec,
1089                 .extra1         = &minolduid,
1090                 .extra2         = &maxolduid,
1091         },
1092         {
1093                 .ctl_name       = FS_OVERFLOWGID,
1094                 .procname       = "overflowgid",
1095                 .data           = &fs_overflowgid,
1096                 .maxlen         = sizeof(int),
1097                 .mode           = 0644,
1098                 .proc_handler   = &proc_dointvec_minmax,
1099                 .strategy       = &sysctl_intvec,
1100                 .extra1         = &minolduid,
1101                 .extra2         = &maxolduid,
1102         },
1103         {
1104                 .ctl_name       = FS_LEASES,
1105                 .procname       = "leases-enable",
1106                 .data           = &leases_enable,
1107                 .maxlen         = sizeof(int),
1108                 .mode           = 0644,
1109                 .proc_handler   = &proc_dointvec,
1110         },
1111 #ifdef CONFIG_DNOTIFY
1112         {
1113                 .ctl_name       = FS_DIR_NOTIFY,
1114                 .procname       = "dir-notify-enable",
1115                 .data           = &dir_notify_enable,
1116                 .maxlen         = sizeof(int),
1117                 .mode           = 0644,
1118                 .proc_handler   = &proc_dointvec,
1119         },
1120 #endif
1121 #ifdef CONFIG_MMU
1122         {
1123                 .ctl_name       = FS_LEASE_TIME,
1124                 .procname       = "lease-break-time",
1125                 .data           = &lease_break_time,
1126                 .maxlen         = sizeof(int),
1127                 .mode           = 0644,
1128                 .proc_handler   = &proc_dointvec,
1129         },
1130         {
1131                 .ctl_name       = FS_AIO_NR,
1132                 .procname       = "aio-nr",
1133                 .data           = &aio_nr,
1134                 .maxlen         = sizeof(aio_nr),
1135                 .mode           = 0444,
1136                 .proc_handler   = &proc_doulongvec_minmax,
1137         },
1138         {
1139                 .ctl_name       = FS_AIO_MAX_NR,
1140                 .procname       = "aio-max-nr",
1141                 .data           = &aio_max_nr,
1142                 .maxlen         = sizeof(aio_max_nr),
1143                 .mode           = 0644,
1144                 .proc_handler   = &proc_doulongvec_minmax,
1145         },
1146 #ifdef CONFIG_INOTIFY_USER
1147         {
1148                 .ctl_name       = FS_INOTIFY,
1149                 .procname       = "inotify",
1150                 .mode           = 0555,
1151                 .child          = inotify_table,
1152         },
1153 #endif
1154 #endif
1155         {
1156                 .ctl_name       = KERN_SETUID_DUMPABLE,
1157                 .procname       = "suid_dumpable",
1158                 .data           = &suid_dumpable,
1159                 .maxlen         = sizeof(int),
1160                 .mode           = 0644,
1161                 .proc_handler   = &proc_dointvec,
1162         },
1163         { .ctl_name = 0 }
1164 };
1165
1166 static ctl_table debug_table[] = {
1167         { .ctl_name = 0 }
1168 };
1169
1170 static ctl_table dev_table[] = {
1171         { .ctl_name = 0 }
1172 };
1173
1174 extern void init_irq_proc (void);
1175
1176 static DEFINE_SPINLOCK(sysctl_lock);
1177
1178 /* called under sysctl_lock */
1179 static int use_table(struct ctl_table_header *p)
1180 {
1181         if (unlikely(p->unregistering))
1182                 return 0;
1183         p->used++;
1184         return 1;
1185 }
1186
1187 /* called under sysctl_lock */
1188 static void unuse_table(struct ctl_table_header *p)
1189 {
1190         if (!--p->used)
1191                 if (unlikely(p->unregistering))
1192                         complete(p->unregistering);
1193 }
1194
1195 /* called under sysctl_lock, will reacquire if has to wait */
1196 static void start_unregistering(struct ctl_table_header *p)
1197 {
1198         /*
1199          * if p->used is 0, nobody will ever touch that entry again;
1200          * we'll eliminate all paths to it before dropping sysctl_lock
1201          */
1202         if (unlikely(p->used)) {
1203                 struct completion wait;
1204                 init_completion(&wait);
1205                 p->unregistering = &wait;
1206                 spin_unlock(&sysctl_lock);
1207                 wait_for_completion(&wait);
1208                 spin_lock(&sysctl_lock);
1209         }
1210         /*
1211          * do not remove from the list until nobody holds it; walking the
1212          * list in do_sysctl() relies on that.
1213          */
1214         list_del_init(&p->ctl_entry);
1215 }
1216
1217 void __init sysctl_init(void)
1218 {
1219 #ifdef CONFIG_PROC_SYSCTL
1220         register_proc_table(root_table, proc_sys_root, &root_table_header);
1221         init_irq_proc();
1222 #endif
1223 }
1224
1225 #ifdef CONFIG_SYSCTL_SYSCALL
1226 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1227                void __user *newval, size_t newlen)
1228 {
1229         struct list_head *tmp;
1230         int error = -ENOTDIR;
1231
1232         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1233                 return -ENOTDIR;
1234         if (oldval) {
1235                 int old_len;
1236                 if (!oldlenp || get_user(old_len, oldlenp))
1237                         return -EFAULT;
1238         }
1239         spin_lock(&sysctl_lock);
1240         tmp = &root_table_header.ctl_entry;
1241         do {
1242                 struct ctl_table_header *head =
1243                         list_entry(tmp, struct ctl_table_header, ctl_entry);
1244                 void *context = NULL;
1245
1246                 if (!use_table(head))
1247                         continue;
1248
1249                 spin_unlock(&sysctl_lock);
1250
1251                 error = parse_table(name, nlen, oldval, oldlenp,
1252                                         newval, newlen, head->ctl_table,
1253                                         &context);
1254                 kfree(context);
1255
1256                 spin_lock(&sysctl_lock);
1257                 unuse_table(head);
1258                 if (error != -ENOTDIR)
1259                         break;
1260         } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1261         spin_unlock(&sysctl_lock);
1262         return error;
1263 }
1264
1265 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1266 {
1267         struct __sysctl_args tmp;
1268         int error;
1269
1270         if (copy_from_user(&tmp, args, sizeof(tmp)))
1271                 return -EFAULT;
1272
1273         lock_kernel();
1274         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1275                           tmp.newval, tmp.newlen);
1276         unlock_kernel();
1277         return error;
1278 }
1279 #endif /* CONFIG_SYSCTL_SYSCALL */
1280
1281 /*
1282  * ctl_perm does NOT grant the superuser all rights automatically, because
1283  * some sysctl variables are readonly even to root.
1284  */
1285
1286 static int test_perm(int mode, int op)
1287 {
1288         if (!current->euid)
1289                 mode >>= 6;
1290         else if (in_egroup_p(0))
1291                 mode >>= 3;
1292         if ((mode & op & 0007) == op)
1293                 return 0;
1294         return -EACCES;
1295 }
1296
1297 static inline int ctl_perm(ctl_table *table, int op)
1298 {
1299         int error;
1300         error = security_sysctl(table, op);
1301         if (error)
1302                 return error;
1303         return test_perm(table->mode, op);
1304 }
1305
1306 #ifdef CONFIG_SYSCTL_SYSCALL
1307 static int parse_table(int __user *name, int nlen,
1308                        void __user *oldval, size_t __user *oldlenp,
1309                        void __user *newval, size_t newlen,
1310                        ctl_table *table, void **context)
1311 {
1312         int n;
1313 repeat:
1314         if (!nlen)
1315                 return -ENOTDIR;
1316         if (get_user(n, name))
1317                 return -EFAULT;
1318         for ( ; table->ctl_name || table->procname; table++) {
1319                 if (!table->ctl_name)
1320                         continue;
1321                 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1322                         int error;
1323                         if (table->child) {
1324                                 if (ctl_perm(table, 001))
1325                                         return -EPERM;
1326                                 if (table->strategy) {
1327                                         error = table->strategy(
1328                                                 table, name, nlen,
1329                                                 oldval, oldlenp,
1330                                                 newval, newlen, context);
1331                                         if (error)
1332                                                 return error;
1333                                 }
1334                                 name++;
1335                                 nlen--;
1336                                 table = table->child;
1337                                 goto repeat;
1338                         }
1339                         error = do_sysctl_strategy(table, name, nlen,
1340                                                    oldval, oldlenp,
1341                                                    newval, newlen, context);
1342                         return error;
1343                 }
1344         }
1345         return -ENOTDIR;
1346 }
1347
1348 /* Perform the actual read/write of a sysctl table entry. */
1349 int do_sysctl_strategy (ctl_table *table,
1350                         int __user *name, int nlen,
1351                         void __user *oldval, size_t __user *oldlenp,
1352                         void __user *newval, size_t newlen, void **context)
1353 {
1354         int op = 0, rc;
1355         size_t len;
1356
1357         if (oldval)
1358                 op |= 004;
1359         if (newval)
1360                 op |= 002;
1361         if (ctl_perm(table, op))
1362                 return -EPERM;
1363
1364         if (table->strategy) {
1365                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1366                                      newval, newlen, context);
1367                 if (rc < 0)
1368                         return rc;
1369                 if (rc > 0)
1370                         return 0;
1371         }
1372
1373         /* If there is no strategy routine, or if the strategy returns
1374          * zero, proceed with automatic r/w */
1375         if (table->data && table->maxlen) {
1376                 if (oldval && oldlenp) {
1377                         if (get_user(len, oldlenp))
1378                                 return -EFAULT;
1379                         if (len) {
1380                                 if (len > table->maxlen)
1381                                         len = table->maxlen;
1382                                 if(copy_to_user(oldval, table->data, len))
1383                                         return -EFAULT;
1384                                 if(put_user(len, oldlenp))
1385                                         return -EFAULT;
1386                         }
1387                 }
1388                 if (newval && newlen) {
1389                         len = newlen;
1390                         if (len > table->maxlen)
1391                                 len = table->maxlen;
1392                         if(copy_from_user(table->data, newval, len))
1393                                 return -EFAULT;
1394                 }
1395         }
1396         return 0;
1397 }
1398 #endif /* CONFIG_SYSCTL_SYSCALL */
1399
1400 /**
1401  * register_sysctl_table - register a sysctl hierarchy
1402  * @table: the top-level table structure
1403  * @insert_at_head: whether the entry should be inserted in front or at the end
1404  *
1405  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1406  * array. An entry with a ctl_name of 0 terminates the table.
1407  *
1408  * The members of the &ctl_table structure are used as follows:
1409  *
1410  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1411  *            must be unique within that level of sysctl
1412  *
1413  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1414  *            enter a sysctl file
1415  *
1416  * data - a pointer to data for use by proc_handler
1417  *
1418  * maxlen - the maximum size in bytes of the data
1419  *
1420  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1421  *
1422  * child - a pointer to the child sysctl table if this entry is a directory, or
1423  *         %NULL.
1424  *
1425  * proc_handler - the text handler routine (described below)
1426  *
1427  * strategy - the strategy routine (described below)
1428  *
1429  * de - for internal use by the sysctl routines
1430  *
1431  * extra1, extra2 - extra pointers usable by the proc handler routines
1432  *
1433  * Leaf nodes in the sysctl tree will be represented by a single file
1434  * under /proc; non-leaf nodes will be represented by directories.
1435  *
1436  * sysctl(2) can automatically manage read and write requests through
1437  * the sysctl table.  The data and maxlen fields of the ctl_table
1438  * struct enable minimal validation of the values being written to be
1439  * performed, and the mode field allows minimal authentication.
1440  *
1441  * More sophisticated management can be enabled by the provision of a
1442  * strategy routine with the table entry.  This will be called before
1443  * any automatic read or write of the data is performed.
1444  *
1445  * The strategy routine may return
1446  *
1447  * < 0 - Error occurred (error is passed to user process)
1448  *
1449  * 0   - OK - proceed with automatic read or write.
1450  *
1451  * > 0 - OK - read or write has been done by the strategy routine, so
1452  *       return immediately.
1453  *
1454  * There must be a proc_handler routine for any terminal nodes
1455  * mirrored under /proc/sys (non-terminals are handled by a built-in
1456  * directory handler).  Several default handlers are available to
1457  * cover common cases -
1458  *
1459  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1460  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1461  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1462  *
1463  * It is the handler's job to read the input buffer from user memory
1464  * and process it. The handler should return 0 on success.
1465  *
1466  * This routine returns %NULL on a failure to register, and a pointer
1467  * to the table header on success.
1468  */
1469 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1470                                                int insert_at_head)
1471 {
1472         struct ctl_table_header *tmp;
1473         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1474         if (!tmp)
1475                 return NULL;
1476         tmp->ctl_table = table;
1477         INIT_LIST_HEAD(&tmp->ctl_entry);
1478         tmp->used = 0;
1479         tmp->unregistering = NULL;
1480         spin_lock(&sysctl_lock);
1481         if (insert_at_head)
1482                 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1483         else
1484                 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1485         spin_unlock(&sysctl_lock);
1486 #ifdef CONFIG_PROC_SYSCTL
1487         register_proc_table(table, proc_sys_root, tmp);
1488 #endif
1489         return tmp;
1490 }
1491
1492 /**
1493  * unregister_sysctl_table - unregister a sysctl table hierarchy
1494  * @header: the header returned from register_sysctl_table
1495  *
1496  * Unregisters the sysctl table and all children. proc entries may not
1497  * actually be removed until they are no longer used by anyone.
1498  */
1499 void unregister_sysctl_table(struct ctl_table_header * header)
1500 {
1501         might_sleep();
1502         spin_lock(&sysctl_lock);
1503         start_unregistering(header);
1504 #ifdef CONFIG_PROC_SYSCTL
1505         unregister_proc_table(header->ctl_table, proc_sys_root);
1506 #endif
1507         spin_unlock(&sysctl_lock);
1508         kfree(header);
1509 }
1510
1511 #else /* !CONFIG_SYSCTL */
1512 struct ctl_table_header * register_sysctl_table(ctl_table * table,
1513                                                 int insert_at_head)
1514 {
1515         return NULL;
1516 }
1517
1518 void unregister_sysctl_table(struct ctl_table_header * table)
1519 {
1520 }
1521
1522 #endif /* CONFIG_SYSCTL */
1523
1524 /*
1525  * /proc/sys support
1526  */
1527
1528 #ifdef CONFIG_PROC_SYSCTL
1529
1530 /* Scan the sysctl entries in table and add them all into /proc */
1531 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1532 {
1533         struct proc_dir_entry *de;
1534         int len;
1535         mode_t mode;
1536
1537         for (; table->ctl_name || table->procname; table++) {
1538                 /* Can't do anything without a proc name. */
1539                 if (!table->procname)
1540                         continue;
1541                 /* Maybe we can't do anything with it... */
1542                 if (!table->proc_handler && !table->child) {
1543                         printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1544                                 table->procname);
1545                         continue;
1546                 }
1547
1548                 len = strlen(table->procname);
1549                 mode = table->mode;
1550
1551                 de = NULL;
1552                 if (table->proc_handler)
1553                         mode |= S_IFREG;
1554                 else {
1555                         mode |= S_IFDIR;
1556                         for (de = root->subdir; de; de = de->next) {
1557                                 if (proc_match(len, table->procname, de))
1558                                         break;
1559                         }
1560                         /* If the subdir exists already, de is non-NULL */
1561                 }
1562
1563                 if (!de) {
1564                         de = create_proc_entry(table->procname, mode, root);
1565                         if (!de)
1566                                 continue;
1567                         de->set = set;
1568                         de->data = (void *) table;
1569                         if (table->proc_handler)
1570                                 de->proc_fops = &proc_sys_file_operations;
1571                 }
1572                 table->de = de;
1573                 if (de->mode & S_IFDIR)
1574                         register_proc_table(table->child, de, set);
1575         }
1576 }
1577
1578 /*
1579  * Unregister a /proc sysctl table and any subdirectories.
1580  */
1581 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1582 {
1583         struct proc_dir_entry *de;
1584         for (; table->ctl_name || table->procname; table++) {
1585                 if (!(de = table->de))
1586                         continue;
1587                 if (de->mode & S_IFDIR) {
1588                         if (!table->child) {
1589                                 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1590                                 continue;
1591                         }
1592                         unregister_proc_table(table->child, de);
1593
1594                         /* Don't unregister directories which still have entries.. */
1595                         if (de->subdir)
1596                                 continue;
1597                 }
1598
1599                 /*
1600                  * In any case, mark the entry as goner; we'll keep it
1601                  * around if it's busy, but we'll know to do nothing with
1602                  * its fields.  We are under sysctl_lock here.
1603                  */
1604                 de->data = NULL;
1605
1606                 /* Don't unregister proc entries that are still being used.. */
1607                 if (atomic_read(&de->count))
1608                         continue;
1609
1610                 table->de = NULL;
1611                 remove_proc_entry(table->procname, root);
1612         }
1613 }
1614
1615 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1616                           size_t count, loff_t *ppos)
1617 {
1618         int op;
1619         struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
1620         struct ctl_table *table;
1621         size_t res;
1622         ssize_t error = -ENOTDIR;
1623
1624         spin_lock(&sysctl_lock);
1625         if (de && de->data && use_table(de->set)) {
1626                 /*
1627                  * at that point we know that sysctl was not unregistered
1628                  * and won't be until we finish
1629                  */
1630                 spin_unlock(&sysctl_lock);
1631                 table = (struct ctl_table *) de->data;
1632                 if (!table || !table->proc_handler)
1633                         goto out;
1634                 error = -EPERM;
1635                 op = (write ? 002 : 004);
1636                 if (ctl_perm(table, op))
1637                         goto out;
1638
1639                 /* careful: calling conventions are nasty here */
1640                 res = count;
1641                 error = (*table->proc_handler)(table, write, file,
1642                                                 buf, &res, ppos);
1643                 if (!error)
1644                         error = res;
1645         out:
1646                 spin_lock(&sysctl_lock);
1647                 unuse_table(de->set);
1648         }
1649         spin_unlock(&sysctl_lock);
1650         return error;
1651 }
1652
1653 static int proc_opensys(struct inode *inode, struct file *file)
1654 {
1655         if (file->f_mode & FMODE_WRITE) {
1656                 /*
1657                  * sysctl entries that are not writable,
1658                  * are _NOT_ writable, capabilities or not.
1659                  */
1660                 if (!(inode->i_mode & S_IWUSR))
1661                         return -EPERM;
1662         }
1663
1664         return 0;
1665 }
1666
1667 static ssize_t proc_readsys(struct file * file, char __user * buf,
1668                             size_t count, loff_t *ppos)
1669 {
1670         return do_rw_proc(0, file, buf, count, ppos);
1671 }
1672
1673 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1674                              size_t count, loff_t *ppos)
1675 {
1676         return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1677 }
1678
1679 static int _proc_do_string(void* data, int maxlen, int write,
1680                            struct file *filp, void __user *buffer,
1681                            size_t *lenp, loff_t *ppos)
1682 {
1683         size_t len;
1684         char __user *p;
1685         char c;
1686
1687         if (!data || !maxlen || !*lenp ||
1688             (*ppos && !write)) {
1689                 *lenp = 0;
1690                 return 0;
1691         }
1692
1693         if (write) {
1694                 len = 0;
1695                 p = buffer;
1696                 while (len < *lenp) {
1697                         if (get_user(c, p++))
1698                                 return -EFAULT;
1699                         if (c == 0 || c == '\n')
1700                                 break;
1701                         len++;
1702                 }
1703                 if (len >= maxlen)
1704                         len = maxlen-1;
1705                 if(copy_from_user(data, buffer, len))
1706                         return -EFAULT;
1707                 ((char *) data)[len] = 0;
1708                 *ppos += *lenp;
1709         } else {
1710                 len = strlen(data);
1711                 if (len > maxlen)
1712                         len = maxlen;
1713                 if (len > *lenp)
1714                         len = *lenp;
1715                 if (len)
1716                         if(copy_to_user(buffer, data, len))
1717                                 return -EFAULT;
1718                 if (len < *lenp) {
1719                         if(put_user('\n', ((char __user *) buffer) + len))
1720                                 return -EFAULT;
1721                         len++;
1722                 }
1723                 *lenp = len;
1724                 *ppos += len;
1725         }
1726         return 0;
1727 }
1728
1729 /**
1730  * proc_dostring - read a string sysctl
1731  * @table: the sysctl table
1732  * @write: %TRUE if this is a write to the sysctl file
1733  * @filp: the file structure
1734  * @buffer: the user buffer
1735  * @lenp: the size of the user buffer
1736  * @ppos: file position
1737  *
1738  * Reads/writes a string from/to the user buffer. If the kernel
1739  * buffer provided is not large enough to hold the string, the
1740  * string is truncated. The copied string is %NULL-terminated.
1741  * If the string is being read by the user process, it is copied
1742  * and a newline '\n' is added. It is truncated if the buffer is
1743  * not large enough.
1744  *
1745  * Returns 0 on success.
1746  */
1747 int proc_dostring(ctl_table *table, int write, struct file *filp,
1748                   void __user *buffer, size_t *lenp, loff_t *ppos)
1749 {
1750         return _proc_do_string(table->data, table->maxlen, write, filp,
1751                                buffer, lenp, ppos);
1752 }
1753
1754 /*
1755  *      Special case of dostring for the UTS structure. This has locks
1756  *      to observe. Should this be in kernel/sys.c ????
1757  */
1758
1759 #ifndef CONFIG_UTS_NS
1760 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
1761                   void __user *buffer, size_t *lenp, loff_t *ppos)
1762 {
1763         int r;
1764
1765         if (!write) {
1766                 down_read(&uts_sem);
1767                 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1768                 up_read(&uts_sem);
1769         } else {
1770                 down_write(&uts_sem);
1771                 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1772                 up_write(&uts_sem);
1773         }
1774         return r;
1775 }
1776 #else /* !CONFIG_UTS_NS */
1777 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
1778                   void __user *buffer, size_t *lenp, loff_t *ppos)
1779 {
1780         int r;
1781         struct uts_namespace* uts_ns = current->nsproxy->uts_ns;
1782         char* which;
1783
1784         switch (table->ctl_name) {
1785         case KERN_OSTYPE:
1786                 which = uts_ns->name.sysname;
1787                 break;
1788         case KERN_NODENAME:
1789                 which = uts_ns->name.nodename;
1790                 break;
1791         case KERN_OSRELEASE:
1792                 which = uts_ns->name.release;
1793                 break;
1794         case KERN_VERSION:
1795                 which = uts_ns->name.version;
1796                 break;
1797         case KERN_DOMAINNAME:
1798                 which = uts_ns->name.domainname;
1799                 break;
1800         default:
1801                 r = -EINVAL;
1802                 goto out;
1803         }
1804
1805         if (!write) {
1806                 down_read(&uts_sem);
1807                 r=_proc_do_string(which,table->maxlen,0,filp,buffer,lenp, ppos);
1808                 up_read(&uts_sem);
1809         } else {
1810                 down_write(&uts_sem);
1811                 r=_proc_do_string(which,table->maxlen,1,filp,buffer,lenp, ppos);
1812                 up_write(&uts_sem);
1813         }
1814  out:
1815         return r;
1816 }
1817 #endif /* !CONFIG_UTS_NS */
1818
1819 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1820                                  int *valp,
1821                                  int write, void *data)
1822 {
1823         if (write) {
1824                 *valp = *negp ? -*lvalp : *lvalp;
1825         } else {
1826                 int val = *valp;
1827                 if (val < 0) {
1828                         *negp = -1;
1829                         *lvalp = (unsigned long)-val;
1830                 } else {
1831                         *negp = 0;
1832                         *lvalp = (unsigned long)val;
1833                 }
1834         }
1835         return 0;
1836 }
1837
1838 static int __do_proc_dointvec(void *tbl_data, ctl_table *table,
1839                   int write, struct file *filp, void __user *buffer,
1840                   size_t *lenp, loff_t *ppos,
1841                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1842                               int write, void *data),
1843                   void *data)
1844 {
1845 #define TMPBUFLEN 21
1846         int *i, vleft, first=1, neg, val;
1847         unsigned long lval;
1848         size_t left, len;
1849
1850         char buf[TMPBUFLEN], *p;
1851         char __user *s = buffer;
1852
1853         if (!tbl_data || !table->maxlen || !*lenp ||
1854             (*ppos && !write)) {
1855                 *lenp = 0;
1856                 return 0;
1857         }
1858
1859         i = (int *) tbl_data;
1860         vleft = table->maxlen / sizeof(*i);
1861         left = *lenp;
1862
1863         if (!conv)
1864                 conv = do_proc_dointvec_conv;
1865
1866         for (; left && vleft--; i++, first=0) {
1867                 if (write) {
1868                         while (left) {
1869                                 char c;
1870                                 if (get_user(c, s))
1871                                         return -EFAULT;
1872                                 if (!isspace(c))
1873                                         break;
1874                                 left--;
1875                                 s++;
1876                         }
1877                         if (!left)
1878                                 break;
1879                         neg = 0;
1880                         len = left;
1881                         if (len > sizeof(buf) - 1)
1882                                 len = sizeof(buf) - 1;
1883                         if (copy_from_user(buf, s, len))
1884                                 return -EFAULT;
1885                         buf[len] = 0;
1886                         p = buf;
1887                         if (*p == '-' && left > 1) {
1888                                 neg = 1;
1889                                 left--, p++;
1890                         }
1891                         if (*p < '0' || *p > '9')
1892                                 break;
1893
1894                         lval = simple_strtoul(p, &p, 0);
1895
1896                         len = p-buf;
1897                         if ((len < left) && *p && !isspace(*p))
1898                                 break;
1899                         if (neg)
1900                                 val = -val;
1901                         s += len;
1902                         left -= len;
1903
1904                         if (conv(&neg, &lval, i, 1, data))
1905                                 break;
1906                 } else {
1907                         p = buf;
1908                         if (!first)
1909                                 *p++ = '\t';
1910
1911                         if (conv(&neg, &lval, i, 0, data))
1912                                 break;
1913
1914                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1915                         len = strlen(buf);
1916                         if (len > left)
1917                                 len = left;
1918                         if(copy_to_user(s, buf, len))
1919                                 return -EFAULT;
1920                         left -= len;
1921                         s += len;
1922                 }
1923         }
1924
1925         if (!write && !first && left) {
1926                 if(put_user('\n', s))
1927                         return -EFAULT;
1928                 left--, s++;
1929         }
1930         if (write) {
1931                 while (left) {
1932                         char c;
1933                         if (get_user(c, s++))
1934                                 return -EFAULT;
1935                         if (!isspace(c))
1936                                 break;
1937                         left--;
1938                 }
1939         }
1940         if (write && first)
1941                 return -EINVAL;
1942         *lenp -= left;
1943         *ppos += *lenp;
1944         return 0;
1945 #undef TMPBUFLEN
1946 }
1947
1948 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1949                   void __user *buffer, size_t *lenp, loff_t *ppos,
1950                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1951                               int write, void *data),
1952                   void *data)
1953 {
1954         return __do_proc_dointvec(table->data, table, write, filp,
1955                         buffer, lenp, ppos, conv, data);
1956 }
1957
1958 /**
1959  * proc_dointvec - read a vector of integers
1960  * @table: the sysctl table
1961  * @write: %TRUE if this is a write to the sysctl file
1962  * @filp: the file structure
1963  * @buffer: the user buffer
1964  * @lenp: the size of the user buffer
1965  * @ppos: file position
1966  *
1967  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1968  * values from/to the user buffer, treated as an ASCII string.
1969  *
1970  * Returns 0 on success.
1971  */
1972 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1973                      void __user *buffer, size_t *lenp, loff_t *ppos)
1974 {
1975     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1976                             NULL,NULL);
1977 }
1978
1979 #define OP_SET  0
1980 #define OP_AND  1
1981 #define OP_OR   2
1982 #define OP_MAX  3
1983 #define OP_MIN  4
1984
1985 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1986                                       int *valp,
1987                                       int write, void *data)
1988 {
1989         int op = *(int *)data;
1990         if (write) {
1991                 int val = *negp ? -*lvalp : *lvalp;
1992                 switch(op) {
1993                 case OP_SET:    *valp = val; break;
1994                 case OP_AND:    *valp &= val; break;
1995                 case OP_OR:     *valp |= val; break;
1996                 case OP_MAX:    if(*valp < val)
1997                                         *valp = val;
1998                                 break;
1999                 case OP_MIN:    if(*valp > val)
2000                                 *valp = val;
2001                                 break;
2002                 }
2003         } else {
2004                 int val = *valp;
2005                 if (val < 0) {
2006                         *negp = -1;
2007                         *lvalp = (unsigned long)-val;
2008                 } else {
2009                         *negp = 0;
2010                         *lvalp = (unsigned long)val;
2011                 }
2012         }
2013         return 0;
2014 }
2015
2016 /*
2017  *      init may raise the set.
2018  */
2019
2020 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2021                         void __user *buffer, size_t *lenp, loff_t *ppos)
2022 {
2023         int op;
2024
2025         if (!capable(CAP_SYS_MODULE)) {
2026                 return -EPERM;
2027         }
2028
2029         op = is_init(current) ? OP_SET : OP_AND;
2030         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2031                                 do_proc_dointvec_bset_conv,&op);
2032 }
2033
2034 struct do_proc_dointvec_minmax_conv_param {
2035         int *min;
2036         int *max;
2037 };
2038
2039 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2040                                         int *valp,
2041                                         int write, void *data)
2042 {
2043         struct do_proc_dointvec_minmax_conv_param *param = data;
2044         if (write) {
2045                 int val = *negp ? -*lvalp : *lvalp;
2046                 if ((param->min && *param->min > val) ||
2047                     (param->max && *param->max < val))
2048                         return -EINVAL;
2049                 *valp = val;
2050         } else {
2051                 int val = *valp;
2052                 if (val < 0) {
2053                         *negp = -1;
2054                         *lvalp = (unsigned long)-val;
2055                 } else {
2056                         *negp = 0;
2057                         *lvalp = (unsigned long)val;
2058                 }
2059         }
2060         return 0;
2061 }
2062
2063 /**
2064  * proc_dointvec_minmax - read a vector of integers with min/max values
2065  * @table: the sysctl table
2066  * @write: %TRUE if this is a write to the sysctl file
2067  * @filp: the file structure
2068  * @buffer: the user buffer
2069  * @lenp: the size of the user buffer
2070  * @ppos: file position
2071  *
2072  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2073  * values from/to the user buffer, treated as an ASCII string.
2074  *
2075  * This routine will ensure the values are within the range specified by
2076  * table->extra1 (min) and table->extra2 (max).
2077  *
2078  * Returns 0 on success.
2079  */
2080 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2081                   void __user *buffer, size_t *lenp, loff_t *ppos)
2082 {
2083         struct do_proc_dointvec_minmax_conv_param param = {
2084                 .min = (int *) table->extra1,
2085                 .max = (int *) table->extra2,
2086         };
2087         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2088                                 do_proc_dointvec_minmax_conv, &param);
2089 }
2090
2091 static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write,
2092                                      struct file *filp,
2093                                      void __user *buffer,
2094                                      size_t *lenp, loff_t *ppos,
2095                                      unsigned long convmul,
2096                                      unsigned long convdiv)
2097 {
2098 #define TMPBUFLEN 21
2099         unsigned long *i, *min, *max, val;
2100         int vleft, first=1, neg;
2101         size_t len, left;
2102         char buf[TMPBUFLEN], *p;
2103         char __user *s = buffer;
2104
2105         if (!data || !table->maxlen || !*lenp ||
2106             (*ppos && !write)) {
2107                 *lenp = 0;
2108                 return 0;
2109         }
2110
2111         i = (unsigned long *) data;
2112         min = (unsigned long *) table->extra1;
2113         max = (unsigned long *) table->extra2;
2114         vleft = table->maxlen / sizeof(unsigned long);
2115         left = *lenp;
2116
2117         for (; left && vleft--; i++, min++, max++, first=0) {
2118                 if (write) {
2119                         while (left) {
2120                                 char c;
2121                                 if (get_user(c, s))
2122                                         return -EFAULT;
2123                                 if (!isspace(c))
2124                                         break;
2125                                 left--;
2126                                 s++;
2127                         }
2128                         if (!left)
2129                                 break;
2130                         neg = 0;
2131                         len = left;
2132                         if (len > TMPBUFLEN-1)
2133                                 len = TMPBUFLEN-1;
2134                         if (copy_from_user(buf, s, len))
2135                                 return -EFAULT;
2136                         buf[len] = 0;
2137                         p = buf;
2138                         if (*p == '-' && left > 1) {
2139                                 neg = 1;
2140                                 left--, p++;
2141                         }
2142                         if (*p < '0' || *p > '9')
2143                                 break;
2144                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2145                         len = p-buf;
2146                         if ((len < left) && *p && !isspace(*p))
2147                                 break;
2148                         if (neg)
2149                                 val = -val;
2150                         s += len;
2151                         left -= len;
2152
2153                         if(neg)
2154                                 continue;
2155                         if ((min && val < *min) || (max && val > *max))
2156                                 continue;
2157                         *i = val;
2158                 } else {
2159                         p = buf;
2160                         if (!first)
2161                                 *p++ = '\t';
2162                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2163                         len = strlen(buf);
2164                         if (len > left)
2165                                 len = left;
2166                         if(copy_to_user(s, buf, len))
2167                                 return -EFAULT;
2168                         left -= len;
2169                         s += len;
2170                 }
2171         }
2172
2173         if (!write && !first && left) {
2174                 if(put_user('\n', s))
2175                         return -EFAULT;
2176                 left--, s++;
2177         }
2178         if (write) {
2179                 while (left) {
2180                         char c;
2181                         if (get_user(c, s++))
2182                                 return -EFAULT;
2183                         if (!isspace(c))
2184                                 break;
2185                         left--;
2186                 }
2187         }
2188         if (write && first)
2189                 return -EINVAL;
2190         *lenp -= left;
2191         *ppos += *lenp;
2192         return 0;
2193 #undef TMPBUFLEN
2194 }
2195
2196 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
2197                                      struct file *filp,
2198                                      void __user *buffer,
2199                                      size_t *lenp, loff_t *ppos,
2200                                      unsigned long convmul,
2201                                      unsigned long convdiv)
2202 {
2203         return __do_proc_doulongvec_minmax(table->data, table, write,
2204                         filp, buffer, lenp, ppos, convmul, convdiv);
2205 }
2206
2207 /**
2208  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2209  * @table: the sysctl table
2210  * @write: %TRUE if this is a write to the sysctl file
2211  * @filp: the file structure
2212  * @buffer: the user buffer
2213  * @lenp: the size of the user buffer
2214  * @ppos: file position
2215  *
2216  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2217  * values from/to the user buffer, treated as an ASCII string.
2218  *
2219  * This routine will ensure the values are within the range specified by
2220  * table->extra1 (min) and table->extra2 (max).
2221  *
2222  * Returns 0 on success.
2223  */
2224 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2225                            void __user *buffer, size_t *lenp, loff_t *ppos)
2226 {
2227     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2228 }
2229
2230 /**
2231  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2232  * @table: the sysctl table
2233  * @write: %TRUE if this is a write to the sysctl file
2234  * @filp: the file structure
2235  * @buffer: the user buffer
2236  * @lenp: the size of the user buffer
2237  * @ppos: file position
2238  *
2239  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2240  * values from/to the user buffer, treated as an ASCII string. The values
2241  * are treated as milliseconds, and converted to jiffies when they are stored.
2242  *
2243  * This routine will ensure the values are within the range specified by
2244  * table->extra1 (min) and table->extra2 (max).
2245  *
2246  * Returns 0 on success.
2247  */
2248 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2249                                       struct file *filp,
2250                                       void __user *buffer,
2251                                       size_t *lenp, loff_t *ppos)
2252 {
2253     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2254                                      lenp, ppos, HZ, 1000l);
2255 }
2256
2257
2258 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2259                                          int *valp,
2260                                          int write, void *data)
2261 {
2262         if (write) {
2263                 if (*lvalp > LONG_MAX / HZ)
2264                         return 1;
2265                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2266         } else {
2267                 int val = *valp;
2268                 unsigned long lval;
2269                 if (val < 0) {
2270                         *negp = -1;
2271                         lval = (unsigned long)-val;
2272                 } else {
2273                         *negp = 0;
2274                         lval = (unsigned long)val;
2275                 }
2276                 *lvalp = lval / HZ;
2277         }
2278         return 0;
2279 }
2280
2281 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2282                                                 int *valp,
2283                                                 int write, void *data)
2284 {
2285         if (write) {
2286                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2287                         return 1;
2288                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2289         } else {
2290                 int val = *valp;
2291                 unsigned long lval;
2292                 if (val < 0) {
2293                         *negp = -1;
2294                         lval = (unsigned long)-val;
2295                 } else {
2296                         *negp = 0;
2297                         lval = (unsigned long)val;
2298                 }
2299                 *lvalp = jiffies_to_clock_t(lval);
2300         }
2301         return 0;
2302 }
2303
2304 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2305                                             int *valp,
2306                                             int write, void *data)
2307 {
2308         if (write) {
2309                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2310         } else {
2311                 int val = *valp;
2312                 unsigned long lval;
2313                 if (val < 0) {
2314                         *negp = -1;
2315                         lval = (unsigned long)-val;
2316                 } else {
2317                         *negp = 0;
2318                         lval = (unsigned long)val;
2319                 }
2320                 *lvalp = jiffies_to_msecs(lval);
2321         }
2322         return 0;
2323 }
2324
2325 /**
2326  * proc_dointvec_jiffies - read a vector of integers as seconds
2327  * @table: the sysctl table
2328  * @write: %TRUE if this is a write to the sysctl file
2329  * @filp: the file structure
2330  * @buffer: the user buffer
2331  * @lenp: the size of the user buffer
2332  * @ppos: file position
2333  *
2334  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2335  * values from/to the user buffer, treated as an ASCII string.
2336  * The values read are assumed to be in seconds, and are converted into
2337  * jiffies.
2338  *
2339  * Returns 0 on success.
2340  */
2341 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2342                           void __user *buffer, size_t *lenp, loff_t *ppos)
2343 {
2344     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2345                             do_proc_dointvec_jiffies_conv,NULL);
2346 }
2347
2348 /**
2349  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2350  * @table: the sysctl table
2351  * @write: %TRUE if this is a write to the sysctl file
2352  * @filp: the file structure
2353  * @buffer: the user buffer
2354  * @lenp: the size of the user buffer
2355  * @ppos: pointer to the file position
2356  *
2357  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2358  * values from/to the user buffer, treated as an ASCII string.
2359  * The values read are assumed to be in 1/USER_HZ seconds, and
2360  * are converted into jiffies.
2361  *
2362  * Returns 0 on success.
2363  */
2364 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2365                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2366 {
2367     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2368                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2369 }
2370
2371 /**
2372  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2373  * @table: the sysctl table
2374  * @write: %TRUE if this is a write to the sysctl file
2375  * @filp: the file structure
2376  * @buffer: the user buffer
2377  * @lenp: the size of the user buffer
2378  * @ppos: file position
2379  * @ppos: the current position in the file
2380  *
2381  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2382  * values from/to the user buffer, treated as an ASCII string.
2383  * The values read are assumed to be in 1/1000 seconds, and
2384  * are converted into jiffies.
2385  *
2386  * Returns 0 on success.
2387  */
2388 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2389                              void __user *buffer, size_t *lenp, loff_t *ppos)
2390 {
2391         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2392                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2393 }
2394
2395 #ifdef CONFIG_SYSVIPC
2396 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2397                 void __user *buffer, size_t *lenp, loff_t *ppos)
2398 {
2399         void *data;
2400         struct ipc_namespace *ns;
2401
2402         ns = current->nsproxy->ipc_ns;
2403
2404         switch (table->ctl_name) {
2405         case KERN_SHMMAX:
2406                 data = &ns->shm_ctlmax;
2407                 goto proc_minmax;
2408         case KERN_SHMALL:
2409                 data = &ns->shm_ctlall;
2410                 goto proc_minmax;
2411         case KERN_SHMMNI:
2412                 data = &ns->shm_ctlmni;
2413                 break;
2414         case KERN_MSGMAX:
2415                 data = &ns->msg_ctlmax;
2416                 break;
2417         case KERN_MSGMNI:
2418                 data = &ns->msg_ctlmni;
2419                 break;
2420         case KERN_MSGMNB:
2421                 data = &ns->msg_ctlmnb;
2422                 break;
2423         case KERN_SEM:
2424                 data = &ns->sem_ctls;
2425                 break;
2426         default:
2427                 return -EINVAL;
2428         }
2429
2430         return __do_proc_dointvec(data, table, write, filp, buffer,
2431                         lenp, ppos, NULL, NULL);
2432 proc_minmax:
2433         return __do_proc_doulongvec_minmax(data, table, write, filp, buffer,
2434                         lenp, ppos, 1l, 1l);
2435 }
2436 #endif
2437
2438 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
2439                            void __user *buffer, size_t *lenp, loff_t *ppos)
2440 {
2441         struct pid *new_pid;
2442         pid_t tmp;
2443         int r;
2444
2445         tmp = pid_nr(cad_pid);
2446
2447         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2448                                lenp, ppos, NULL, NULL);
2449         if (r || !write)
2450                 return r;
2451
2452         new_pid = find_get_pid(tmp);
2453         if (!new_pid)
2454                 return -ESRCH;
2455
2456         put_pid(xchg(&cad_pid, new_pid));
2457         return 0;
2458 }
2459
2460 #else /* CONFIG_PROC_FS */
2461
2462 int proc_dostring(ctl_table *table, int write, struct file *filp,
2463                   void __user *buffer, size_t *lenp, loff_t *ppos)
2464 {
2465         return -ENOSYS;
2466 }
2467
2468 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
2469                 void __user *buffer, size_t *lenp, loff_t *ppos)
2470 {
2471         return -ENOSYS;
2472 }
2473
2474 #ifdef CONFIG_SYSVIPC
2475 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2476                 void __user *buffer, size_t *lenp, loff_t *ppos)
2477 {
2478         return -ENOSYS;
2479 }
2480 #endif
2481
2482 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2483                   void __user *buffer, size_t *lenp, loff_t *ppos)
2484 {
2485         return -ENOSYS;
2486 }
2487
2488 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2489                         void __user *buffer, size_t *lenp, loff_t *ppos)
2490 {
2491         return -ENOSYS;
2492 }
2493
2494 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2495                     void __user *buffer, size_t *lenp, loff_t *ppos)
2496 {
2497         return -ENOSYS;
2498 }
2499
2500 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2501                     void __user *buffer, size_t *lenp, loff_t *ppos)
2502 {
2503         return -ENOSYS;
2504 }
2505
2506 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2507                     void __user *buffer, size_t *lenp, loff_t *ppos)
2508 {
2509         return -ENOSYS;
2510 }
2511
2512 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2513                              void __user *buffer, size_t *lenp, loff_t *ppos)
2514 {
2515         return -ENOSYS;
2516 }
2517
2518 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2519                     void __user *buffer, size_t *lenp, loff_t *ppos)
2520 {
2521         return -ENOSYS;
2522 }
2523
2524 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2525                                       struct file *filp,
2526                                       void __user *buffer,
2527                                       size_t *lenp, loff_t *ppos)
2528 {
2529     return -ENOSYS;
2530 }
2531
2532
2533 #endif /* CONFIG_PROC_FS */
2534
2535
2536 #ifdef CONFIG_SYSCTL_SYSCALL
2537 /*
2538  * General sysctl support routines
2539  */
2540
2541 /* The generic string strategy routine: */
2542 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2543                   void __user *oldval, size_t __user *oldlenp,
2544                   void __user *newval, size_t newlen, void **context)
2545 {
2546         if (!table->data || !table->maxlen)
2547                 return -ENOTDIR;
2548
2549         if (oldval && oldlenp) {
2550                 size_t bufsize;
2551                 if (get_user(bufsize, oldlenp))
2552                         return -EFAULT;
2553                 if (bufsize) {
2554                         size_t len = strlen(table->data), copied;
2555
2556                         /* This shouldn't trigger for a well-formed sysctl */
2557                         if (len > table->maxlen)
2558                                 len = table->maxlen;
2559
2560                         /* Copy up to a max of bufsize-1 bytes of the string */
2561                         copied = (len >= bufsize) ? bufsize - 1 : len;
2562
2563                         if (copy_to_user(oldval, table->data, copied) ||
2564                             put_user(0, (char __user *)(oldval + copied)))
2565                                 return -EFAULT;
2566                         if (put_user(len, oldlenp))
2567                                 return -EFAULT;
2568                 }
2569         }
2570         if (newval && newlen) {
2571                 size_t len = newlen;
2572                 if (len > table->maxlen)
2573                         len = table->maxlen;
2574                 if(copy_from_user(table->data, newval, len))
2575                         return -EFAULT;
2576                 if (len == table->maxlen)
2577                         len--;
2578                 ((char *) table->data)[len] = 0;
2579         }
2580         return 1;
2581 }
2582
2583 /*
2584  * This function makes sure that all of the integers in the vector
2585  * are between the minimum and maximum values given in the arrays
2586  * table->extra1 and table->extra2, respectively.
2587  */
2588 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2589                 void __user *oldval, size_t __user *oldlenp,
2590                 void __user *newval, size_t newlen, void **context)
2591 {
2592
2593         if (newval && newlen) {
2594                 int __user *vec = (int __user *) newval;
2595                 int *min = (int *) table->extra1;
2596                 int *max = (int *) table->extra2;
2597                 size_t length;
2598                 int i;
2599
2600                 if (newlen % sizeof(int) != 0)
2601                         return -EINVAL;
2602
2603                 if (!table->extra1 && !table->extra2)
2604                         return 0;
2605
2606                 if (newlen > table->maxlen)
2607                         newlen = table->maxlen;
2608                 length = newlen / sizeof(int);
2609
2610                 for (i = 0; i < length; i++) {
2611                         int value;
2612                         if (get_user(value, vec + i))
2613                                 return -EFAULT;
2614                         if (min && value < min[i])
2615                                 return -EINVAL;
2616                         if (max && value > max[i])
2617                                 return -EINVAL;
2618                 }
2619         }
2620         return 0;
2621 }
2622
2623 /* Strategy function to convert jiffies to seconds */
2624 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2625                 void __user *oldval, size_t __user *oldlenp,
2626                 void __user *newval, size_t newlen, void **context)
2627 {
2628         if (oldval) {
2629                 size_t olen;
2630                 if (oldlenp) {
2631                         if (get_user(olen, oldlenp))
2632                                 return -EFAULT;
2633                         if (olen!=sizeof(int))
2634                                 return -EINVAL;
2635                 }
2636                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2637                     (oldlenp && put_user(sizeof(int),oldlenp)))
2638                         return -EFAULT;
2639         }
2640         if (newval && newlen) {
2641                 int new;
2642                 if (newlen != sizeof(int))
2643                         return -EINVAL;
2644                 if (get_user(new, (int __user *)newval))
2645                         return -EFAULT;
2646                 *(int *)(table->data) = new*HZ;
2647         }
2648         return 1;
2649 }
2650
2651 /* Strategy function to convert jiffies to seconds */
2652 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2653                 void __user *oldval, size_t __user *oldlenp,
2654                 void __user *newval, size_t newlen, void **context)
2655 {
2656         if (oldval) {
2657                 size_t olen;
2658                 if (oldlenp) {
2659                         if (get_user(olen, oldlenp))
2660                                 return -EFAULT;
2661                         if (olen!=sizeof(int))
2662                                 return -EINVAL;
2663                 }
2664                 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2665                     (oldlenp && put_user(sizeof(int),oldlenp)))
2666                         return -EFAULT;
2667         }
2668         if (newval && newlen) {
2669                 int new;
2670                 if (newlen != sizeof(int))
2671                         return -EINVAL;
2672                 if (get_user(new, (int __user *)newval))
2673                         return -EFAULT;
2674                 *(int *)(table->data) = msecs_to_jiffies(new);
2675         }
2676         return 1;
2677 }
2678
2679 #else /* CONFIG_SYSCTL_SYSCALL */
2680
2681
2682 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2683 {
2684         static int msg_count;
2685         struct __sysctl_args tmp;
2686         int name[CTL_MAXNAME];
2687         int i;
2688
2689         /* Read in the sysctl name for better debug message logging */
2690         if (copy_from_user(&tmp, args, sizeof(tmp)))
2691                 return -EFAULT;
2692         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2693                 return -ENOTDIR;
2694         for (i = 0; i < tmp.nlen; i++)
2695                 if (get_user(name[i], tmp.name + i))
2696                         return -EFAULT;
2697
2698         /* Ignore accesses to kernel.version */
2699         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2700                 goto out;
2701
2702         if (msg_count < 5) {
2703                 msg_count++;
2704                 printk(KERN_INFO
2705                         "warning: process `%s' used the removed sysctl "
2706                         "system call with ", current->comm);
2707                 for (i = 0; i < tmp.nlen; i++)
2708                         printk("%d.", name[i]);
2709                 printk("\n");
2710         }
2711 out:
2712         return -ENOSYS;
2713 }
2714
2715 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2716                   void __user *oldval, size_t __user *oldlenp,
2717                   void __user *newval, size_t newlen, void **context)
2718 {
2719         return -ENOSYS;
2720 }
2721
2722 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2723                 void __user *oldval, size_t __user *oldlenp,
2724                 void __user *newval, size_t newlen, void **context)
2725 {
2726         return -ENOSYS;
2727 }
2728
2729 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2730                 void __user *oldval, size_t __user *oldlenp,
2731                 void __user *newval, size_t newlen, void **context)
2732 {
2733         return -ENOSYS;
2734 }
2735
2736 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2737                 void __user *oldval, size_t __user *oldlenp,
2738                 void __user *newval, size_t newlen, void **context)
2739 {
2740         return -ENOSYS;
2741 }
2742
2743 #endif /* CONFIG_SYSCTL_SYSCALL */
2744
2745 /*
2746  * No sense putting this after each symbol definition, twice,
2747  * exception granted :-)
2748  */
2749 EXPORT_SYMBOL(proc_dointvec);
2750 EXPORT_SYMBOL(proc_dointvec_jiffies);
2751 EXPORT_SYMBOL(proc_dointvec_minmax);
2752 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2753 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2754 EXPORT_SYMBOL(proc_dostring);
2755 EXPORT_SYMBOL(proc_doulongvec_minmax);
2756 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2757 EXPORT_SYMBOL(register_sysctl_table);
2758 EXPORT_SYMBOL(sysctl_intvec);
2759 EXPORT_SYMBOL(sysctl_jiffies);
2760 EXPORT_SYMBOL(sysctl_ms_jiffies);
2761 EXPORT_SYMBOL(sysctl_string);
2762 EXPORT_SYMBOL(unregister_sysctl_table);