kernel/sysctl.c

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