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 *, void **);
 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, void **context);
 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, void **context);
 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                 void *context = NULL;
1247
1248                 if (!use_table(head))
1249                         continue;
1250
1251                 spin_unlock(&sysctl_lock);
1252
1253                 error = parse_table(name, nlen, oldval, oldlenp,
1254                                         newval, newlen, head->ctl_table,
1255                                         &context);
1256                 kfree(context);
1257
1258                 spin_lock(&sysctl_lock);
1259                 unuse_table(head);
1260                 if (error != -ENOTDIR)
1261                         break;
1262         } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1263         spin_unlock(&sysctl_lock);
1264         return error;
1265 }
1266
1267 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1268 {
1269         struct __sysctl_args tmp;
1270         int error;
1271
1272         if (copy_from_user(&tmp, args, sizeof(tmp)))
1273                 return -EFAULT;
1274
1275         lock_kernel();
1276         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1277                           tmp.newval, tmp.newlen);
1278         unlock_kernel();
1279         return error;
1280 }
1281 #endif /* CONFIG_SYSCTL_SYSCALL */
1282
1283 /*
1284  * ctl_perm does NOT grant the superuser all rights automatically, because
1285  * some sysctl variables are readonly even to root.
1286  */
1287
1288 static int test_perm(int mode, int op)
1289 {
1290         if (!current->euid)
1291                 mode >>= 6;
1292         else if (in_egroup_p(0))
1293                 mode >>= 3;
1294         if ((mode & op & 0007) == op)
1295                 return 0;
1296         return -EACCES;
1297 }
1298
1299 static inline int ctl_perm(ctl_table *table, int op)
1300 {
1301         int error;
1302         error = security_sysctl(table, op);
1303         if (error)
1304                 return error;
1305         return test_perm(table->mode, op);
1306 }
1307
1308 #ifdef CONFIG_SYSCTL_SYSCALL
1309 static int parse_table(int __user *name, int nlen,
1310                        void __user *oldval, size_t __user *oldlenp,
1311                        void __user *newval, size_t newlen,
1312                        ctl_table *table, void **context)
1313 {
1314         int n;
1315 repeat:
1316         if (!nlen)
1317                 return -ENOTDIR;
1318         if (get_user(n, name))
1319                 return -EFAULT;
1320         for ( ; table->ctl_name || table->procname; table++) {
1321                 if (!table->ctl_name)
1322                         continue;
1323                 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1324                         int error;
1325                         if (table->child) {
1326                                 if (ctl_perm(table, 001))
1327                                         return -EPERM;
1328                                 if (table->strategy) {
1329                                         error = table->strategy(
1330                                                 table, name, nlen,
1331                                                 oldval, oldlenp,
1332                                                 newval, newlen, context);
1333                                         if (error)
1334                                                 return error;
1335                                 }
1336                                 name++;
1337                                 nlen--;
1338                                 table = table->child;
1339                                 goto repeat;
1340                         }
1341                         error = do_sysctl_strategy(table, name, nlen,
1342                                                    oldval, oldlenp,
1343                                                    newval, newlen, context);
1344                         return error;
1345                 }
1346         }
1347         return -ENOTDIR;
1348 }
1349
1350 /* Perform the actual read/write of a sysctl table entry. */
1351 int do_sysctl_strategy (ctl_table *table,
1352                         int __user *name, int nlen,
1353                         void __user *oldval, size_t __user *oldlenp,
1354                         void __user *newval, size_t newlen, void **context)
1355 {
1356         int op = 0, rc;
1357         size_t len;
1358
1359         if (oldval)
1360                 op |= 004;
1361         if (newval)
1362                 op |= 002;
1363         if (ctl_perm(table, op))
1364                 return -EPERM;
1365
1366         if (table->strategy) {
1367                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1368                                      newval, newlen, context);
1369                 if (rc < 0)
1370                         return rc;
1371                 if (rc > 0)
1372                         return 0;
1373         }
1374
1375         /* If there is no strategy routine, or if the strategy returns
1376          * zero, proceed with automatic r/w */
1377         if (table->data && table->maxlen) {
1378                 if (oldval && oldlenp) {
1379                         if (get_user(len, oldlenp))
1380                                 return -EFAULT;
1381                         if (len) {
1382                                 if (len > table->maxlen)
1383                                         len = table->maxlen;
1384                                 if(copy_to_user(oldval, table->data, len))
1385                                         return -EFAULT;
1386                                 if(put_user(len, oldlenp))
1387                                         return -EFAULT;
1388                         }
1389                 }
1390                 if (newval && newlen) {
1391                         len = newlen;
1392                         if (len > table->maxlen)
1393                                 len = table->maxlen;
1394                         if(copy_from_user(table->data, newval, len))
1395                                 return -EFAULT;
1396                 }
1397         }
1398         return 0;
1399 }
1400 #endif /* CONFIG_SYSCTL_SYSCALL */
1401
1402 /**
1403  * register_sysctl_table - register a sysctl hierarchy
1404  * @table: the top-level table structure
1405  * @insert_at_head: whether the entry should be inserted in front or at the end
1406  *
1407  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1408  * array. An entry with a ctl_name of 0 terminates the table.
1409  *
1410  * The members of the &ctl_table structure are used as follows:
1411  *
1412  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1413  *            must be unique within that level of sysctl
1414  *
1415  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1416  *            enter a sysctl file
1417  *
1418  * data - a pointer to data for use by proc_handler
1419  *
1420  * maxlen - the maximum size in bytes of the data
1421  *
1422  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1423  *
1424  * child - a pointer to the child sysctl table if this entry is a directory, or
1425  *         %NULL.
1426  *
1427  * proc_handler - the text handler routine (described below)
1428  *
1429  * strategy - the strategy routine (described below)
1430  *
1431  * de - for internal use by the sysctl routines
1432  *
1433  * extra1, extra2 - extra pointers usable by the proc handler routines
1434  *
1435  * Leaf nodes in the sysctl tree will be represented by a single file
1436  * under /proc; non-leaf nodes will be represented by directories.
1437  *
1438  * sysctl(2) can automatically manage read and write requests through
1439  * the sysctl table.  The data and maxlen fields of the ctl_table
1440  * struct enable minimal validation of the values being written to be
1441  * performed, and the mode field allows minimal authentication.
1442  *
1443  * More sophisticated management can be enabled by the provision of a
1444  * strategy routine with the table entry.  This will be called before
1445  * any automatic read or write of the data is performed.
1446  *
1447  * The strategy routine may return
1448  *
1449  * < 0 - Error occurred (error is passed to user process)
1450  *
1451  * 0   - OK - proceed with automatic read or write.
1452  *
1453  * > 0 - OK - read or write has been done by the strategy routine, so
1454  *       return immediately.
1455  *
1456  * There must be a proc_handler routine for any terminal nodes
1457  * mirrored under /proc/sys (non-terminals are handled by a built-in
1458  * directory handler).  Several default handlers are available to
1459  * cover common cases -
1460  *
1461  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1462  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1463  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1464  *
1465  * It is the handler's job to read the input buffer from user memory
1466  * and process it. The handler should return 0 on success.
1467  *
1468  * This routine returns %NULL on a failure to register, and a pointer
1469  * to the table header on success.
1470  */
1471 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1472                                                int insert_at_head)
1473 {
1474         struct ctl_table_header *tmp;
1475         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1476         if (!tmp)
1477                 return NULL;
1478         tmp->ctl_table = table;
1479         INIT_LIST_HEAD(&tmp->ctl_entry);
1480         tmp->used = 0;
1481         tmp->unregistering = NULL;
1482         spin_lock(&sysctl_lock);
1483         if (insert_at_head)
1484                 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1485         else
1486                 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1487         spin_unlock(&sysctl_lock);
1488 #ifdef CONFIG_PROC_SYSCTL
1489         register_proc_table(table, proc_sys_root, tmp);
1490 #endif
1491         return tmp;
1492 }
1493
1494 /**
1495  * unregister_sysctl_table - unregister a sysctl table hierarchy
1496  * @header: the header returned from register_sysctl_table
1497  *
1498  * Unregisters the sysctl table and all children. proc entries may not
1499  * actually be removed until they are no longer used by anyone.
1500  */
1501 void unregister_sysctl_table(struct ctl_table_header * header)
1502 {
1503         might_sleep();
1504         spin_lock(&sysctl_lock);
1505         start_unregistering(header);
1506 #ifdef CONFIG_PROC_SYSCTL
1507         unregister_proc_table(header->ctl_table, proc_sys_root);
1508 #endif
1509         spin_unlock(&sysctl_lock);
1510         kfree(header);
1511 }
1512
1513 #else /* !CONFIG_SYSCTL */
1514 struct ctl_table_header * register_sysctl_table(ctl_table * table,
1515                                                 int insert_at_head)
1516 {
1517         return NULL;
1518 }
1519
1520 void unregister_sysctl_table(struct ctl_table_header * table)
1521 {
1522 }
1523
1524 #endif /* CONFIG_SYSCTL */
1525
1526 /*
1527  * /proc/sys support
1528  */
1529
1530 #ifdef CONFIG_PROC_SYSCTL
1531
1532 /* Scan the sysctl entries in table and add them all into /proc */
1533 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1534 {
1535         struct proc_dir_entry *de;
1536         int len;
1537         mode_t mode;
1538
1539         for (; table->ctl_name || table->procname; table++) {
1540                 /* Can't do anything without a proc name. */
1541                 if (!table->procname)
1542                         continue;
1543                 /* Maybe we can't do anything with it... */
1544                 if (!table->proc_handler && !table->child) {
1545                         printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1546                                 table->procname);
1547                         continue;
1548                 }
1549
1550                 len = strlen(table->procname);
1551                 mode = table->mode;
1552
1553                 de = NULL;
1554                 if (table->proc_handler)
1555                         mode |= S_IFREG;
1556                 else {
1557                         mode |= S_IFDIR;
1558                         for (de = root->subdir; de; de = de->next) {
1559                                 if (proc_match(len, table->procname, de))
1560                                         break;
1561                         }
1562                         /* If the subdir exists already, de is non-NULL */
1563                 }
1564
1565                 if (!de) {
1566                         de = create_proc_entry(table->procname, mode, root);
1567                         if (!de)
1568                                 continue;
1569                         de->set = set;
1570                         de->data = (void *) table;
1571                         if (table->proc_handler)
1572                                 de->proc_fops = &proc_sys_file_operations;
1573                 }
1574                 table->de = de;
1575                 if (de->mode & S_IFDIR)
1576                         register_proc_table(table->child, de, set);
1577         }
1578 }
1579
1580 /*
1581  * Unregister a /proc sysctl table and any subdirectories.
1582  */
1583 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1584 {
1585         struct proc_dir_entry *de;
1586         for (; table->ctl_name || table->procname; table++) {
1587                 if (!(de = table->de))
1588                         continue;
1589                 if (de->mode & S_IFDIR) {
1590                         if (!table->child) {
1591                                 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1592                                 continue;
1593                         }
1594                         unregister_proc_table(table->child, de);
1595
1596                         /* Don't unregister directories which still have entries.. */
1597                         if (de->subdir)
1598                                 continue;
1599                 }
1600
1601                 /*
1602                  * In any case, mark the entry as goner; we'll keep it
1603                  * around if it's busy, but we'll know to do nothing with
1604                  * its fields.  We are under sysctl_lock here.
1605                  */
1606                 de->data = NULL;
1607
1608                 /* Don't unregister proc entries that are still being used.. */
1609                 if (atomic_read(&de->count))
1610                         continue;
1611
1612                 table->de = NULL;
1613                 remove_proc_entry(table->procname, root);
1614         }
1615 }
1616
1617 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1618                           size_t count, loff_t *ppos)
1619 {
1620         int op;
1621         struct proc_dir_entry *de = PDE(file->f_path.dentry->d_inode);
1622         struct ctl_table *table;
1623         size_t res;
1624         ssize_t error = -ENOTDIR;
1625
1626         spin_lock(&sysctl_lock);
1627         if (de && de->data && use_table(de->set)) {
1628                 /*
1629                  * at that point we know that sysctl was not unregistered
1630                  * and won't be until we finish
1631                  */
1632                 spin_unlock(&sysctl_lock);
1633                 table = (struct ctl_table *) de->data;
1634                 if (!table || !table->proc_handler)
1635                         goto out;
1636                 error = -EPERM;
1637                 op = (write ? 002 : 004);
1638                 if (ctl_perm(table, op))
1639                         goto out;
1640
1641                 /* careful: calling conventions are nasty here */
1642                 res = count;
1643                 error = (*table->proc_handler)(table, write, file,
1644                                                 buf, &res, ppos);
1645                 if (!error)
1646                         error = res;
1647         out:
1648                 spin_lock(&sysctl_lock);
1649                 unuse_table(de->set);
1650         }
1651         spin_unlock(&sysctl_lock);
1652         return error;
1653 }
1654
1655 static int proc_opensys(struct inode *inode, struct file *file)
1656 {
1657         if (file->f_mode & FMODE_WRITE) {
1658                 /*
1659                  * sysctl entries that are not writable,
1660                  * are _NOT_ writable, capabilities or not.
1661                  */
1662                 if (!(inode->i_mode & S_IWUSR))
1663                         return -EPERM;
1664         }
1665
1666         return 0;
1667 }
1668
1669 static ssize_t proc_readsys(struct file * file, char __user * buf,
1670                             size_t count, loff_t *ppos)
1671 {
1672         return do_rw_proc(0, file, buf, count, ppos);
1673 }
1674
1675 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1676                              size_t count, loff_t *ppos)
1677 {
1678         return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1679 }
1680
1681 static int _proc_do_string(void* data, int maxlen, int write,
1682                            struct file *filp, void __user *buffer,
1683                            size_t *lenp, loff_t *ppos)
1684 {
1685         size_t len;
1686         char __user *p;
1687         char c;
1688
1689         if (!data || !maxlen || !*lenp ||
1690             (*ppos && !write)) {
1691                 *lenp = 0;
1692                 return 0;
1693         }
1694
1695         if (write) {
1696                 len = 0;
1697                 p = buffer;
1698                 while (len < *lenp) {
1699                         if (get_user(c, p++))
1700                                 return -EFAULT;
1701                         if (c == 0 || c == '\n')
1702                                 break;
1703                         len++;
1704                 }
1705                 if (len >= maxlen)
1706                         len = maxlen-1;
1707                 if(copy_from_user(data, buffer, len))
1708                         return -EFAULT;
1709                 ((char *) data)[len] = 0;
1710                 *ppos += *lenp;
1711         } else {
1712                 len = strlen(data);
1713                 if (len > maxlen)
1714                         len = maxlen;
1715                 if (len > *lenp)
1716                         len = *lenp;
1717                 if (len)
1718                         if(copy_to_user(buffer, data, len))
1719                                 return -EFAULT;
1720                 if (len < *lenp) {
1721                         if(put_user('\n', ((char __user *) buffer) + len))
1722                                 return -EFAULT;
1723                         len++;
1724                 }
1725                 *lenp = len;
1726                 *ppos += len;
1727         }
1728         return 0;
1729 }
1730
1731 /**
1732  * proc_dostring - read a string sysctl
1733  * @table: the sysctl table
1734  * @write: %TRUE if this is a write to the sysctl file
1735  * @filp: the file structure
1736  * @buffer: the user buffer
1737  * @lenp: the size of the user buffer
1738  * @ppos: file position
1739  *
1740  * Reads/writes a string from/to the user buffer. If the kernel
1741  * buffer provided is not large enough to hold the string, the
1742  * string is truncated. The copied string is %NULL-terminated.
1743  * If the string is being read by the user process, it is copied
1744  * and a newline '\n' is added. It is truncated if the buffer is
1745  * not large enough.
1746  *
1747  * Returns 0 on success.
1748  */
1749 int proc_dostring(ctl_table *table, int write, struct file *filp,
1750                   void __user *buffer, size_t *lenp, loff_t *ppos)
1751 {
1752         return _proc_do_string(table->data, table->maxlen, write, filp,
1753                                buffer, lenp, ppos);
1754 }
1755
1756 /*
1757  *      Special case of dostring for the UTS structure. This has locks
1758  *      to observe. Should this be in kernel/sys.c ????
1759  */
1760
1761 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
1762                   void __user *buffer, size_t *lenp, loff_t *ppos)
1763 {
1764         int r;
1765         void *which;
1766         which = get_uts(table, write);
1767         r = _proc_do_string(which, table->maxlen,write,filp,buffer,lenp, ppos);
1768         put_uts(table, write, which);
1769         return r;
1770 }
1771
1772 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1773                                  int *valp,
1774                                  int write, void *data)
1775 {
1776         if (write) {
1777                 *valp = *negp ? -*lvalp : *lvalp;
1778         } else {
1779                 int val = *valp;
1780                 if (val < 0) {
1781                         *negp = -1;
1782                         *lvalp = (unsigned long)-val;
1783                 } else {
1784                         *negp = 0;
1785                         *lvalp = (unsigned long)val;
1786                 }
1787         }
1788         return 0;
1789 }
1790
1791 static int __do_proc_dointvec(void *tbl_data, ctl_table *table,
1792                   int write, struct file *filp, void __user *buffer,
1793                   size_t *lenp, loff_t *ppos,
1794                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1795                               int write, void *data),
1796                   void *data)
1797 {
1798 #define TMPBUFLEN 21
1799         int *i, vleft, first=1, neg, val;
1800         unsigned long lval;
1801         size_t left, len;
1802
1803         char buf[TMPBUFLEN], *p;
1804         char __user *s = buffer;
1805
1806         if (!tbl_data || !table->maxlen || !*lenp ||
1807             (*ppos && !write)) {
1808                 *lenp = 0;
1809                 return 0;
1810         }
1811
1812         i = (int *) tbl_data;
1813         vleft = table->maxlen / sizeof(*i);
1814         left = *lenp;
1815
1816         if (!conv)
1817                 conv = do_proc_dointvec_conv;
1818
1819         for (; left && vleft--; i++, first=0) {
1820                 if (write) {
1821                         while (left) {
1822                                 char c;
1823                                 if (get_user(c, s))
1824                                         return -EFAULT;
1825                                 if (!isspace(c))
1826                                         break;
1827                                 left--;
1828                                 s++;
1829                         }
1830                         if (!left)
1831                                 break;
1832                         neg = 0;
1833                         len = left;
1834                         if (len > sizeof(buf) - 1)
1835                                 len = sizeof(buf) - 1;
1836                         if (copy_from_user(buf, s, len))
1837                                 return -EFAULT;
1838                         buf[len] = 0;
1839                         p = buf;
1840                         if (*p == '-' && left > 1) {
1841                                 neg = 1;
1842                                 p++;
1843                         }
1844                         if (*p < '0' || *p > '9')
1845                                 break;
1846
1847                         lval = simple_strtoul(p, &p, 0);
1848
1849                         len = p-buf;
1850                         if ((len < left) && *p && !isspace(*p))
1851                                 break;
1852                         if (neg)
1853                                 val = -val;
1854                         s += len;
1855                         left -= len;
1856
1857                         if (conv(&neg, &lval, i, 1, data))
1858                                 break;
1859                 } else {
1860                         p = buf;
1861                         if (!first)
1862                                 *p++ = '\t';
1863
1864                         if (conv(&neg, &lval, i, 0, data))
1865                                 break;
1866
1867                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1868                         len = strlen(buf);
1869                         if (len > left)
1870                                 len = left;
1871                         if(copy_to_user(s, buf, len))
1872                                 return -EFAULT;
1873                         left -= len;
1874                         s += len;
1875                 }
1876         }
1877
1878         if (!write && !first && left) {
1879                 if(put_user('\n', s))
1880                         return -EFAULT;
1881                 left--, s++;
1882         }
1883         if (write) {
1884                 while (left) {
1885                         char c;
1886                         if (get_user(c, s++))
1887                                 return -EFAULT;
1888                         if (!isspace(c))
1889                                 break;
1890                         left--;
1891                 }
1892         }
1893         if (write && first)
1894                 return -EINVAL;
1895         *lenp -= left;
1896         *ppos += *lenp;
1897         return 0;
1898 #undef TMPBUFLEN
1899 }
1900
1901 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1902                   void __user *buffer, size_t *lenp, loff_t *ppos,
1903                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1904                               int write, void *data),
1905                   void *data)
1906 {
1907         return __do_proc_dointvec(table->data, table, write, filp,
1908                         buffer, lenp, ppos, conv, data);
1909 }
1910
1911 /**
1912  * proc_dointvec - read a vector of integers
1913  * @table: the sysctl table
1914  * @write: %TRUE if this is a write to the sysctl file
1915  * @filp: the file structure
1916  * @buffer: the user buffer
1917  * @lenp: the size of the user buffer
1918  * @ppos: file position
1919  *
1920  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1921  * values from/to the user buffer, treated as an ASCII string.
1922  *
1923  * Returns 0 on success.
1924  */
1925 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1926                      void __user *buffer, size_t *lenp, loff_t *ppos)
1927 {
1928     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1929                             NULL,NULL);
1930 }
1931
1932 #define OP_SET  0
1933 #define OP_AND  1
1934 #define OP_OR   2
1935 #define OP_MAX  3
1936 #define OP_MIN  4
1937
1938 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1939                                       int *valp,
1940                                       int write, void *data)
1941 {
1942         int op = *(int *)data;
1943         if (write) {
1944                 int val = *negp ? -*lvalp : *lvalp;
1945                 switch(op) {
1946                 case OP_SET:    *valp = val; break;
1947                 case OP_AND:    *valp &= val; break;
1948                 case OP_OR:     *valp |= val; break;
1949                 case OP_MAX:    if(*valp < val)
1950                                         *valp = val;
1951                                 break;
1952                 case OP_MIN:    if(*valp > val)
1953                                 *valp = val;
1954                                 break;
1955                 }
1956         } else {
1957                 int val = *valp;
1958                 if (val < 0) {
1959                         *negp = -1;
1960                         *lvalp = (unsigned long)-val;
1961                 } else {
1962                         *negp = 0;
1963                         *lvalp = (unsigned long)val;
1964                 }
1965         }
1966         return 0;
1967 }
1968
1969 /*
1970  *      init may raise the set.
1971  */
1972
1973 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1974                         void __user *buffer, size_t *lenp, loff_t *ppos)
1975 {
1976         int op;
1977
1978         if (!capable(CAP_SYS_MODULE)) {
1979                 return -EPERM;
1980         }
1981
1982         op = is_init(current) ? OP_SET : OP_AND;
1983         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1984                                 do_proc_dointvec_bset_conv,&op);
1985 }
1986
1987 struct do_proc_dointvec_minmax_conv_param {
1988         int *min;
1989         int *max;
1990 };
1991
1992 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1993                                         int *valp,
1994                                         int write, void *data)
1995 {
1996         struct do_proc_dointvec_minmax_conv_param *param = data;
1997         if (write) {
1998                 int val = *negp ? -*lvalp : *lvalp;
1999                 if ((param->min && *param->min > val) ||
2000                     (param->max && *param->max < val))
2001                         return -EINVAL;
2002                 *valp = val;
2003         } else {
2004                 int val = *valp;
2005                 if (val < 0) {
2006                         *negp = -1;
2007                         *lvalp = (unsigned long)-val;
2008                 } else {
2009                         *negp = 0;
2010                         *lvalp = (unsigned long)val;
2011                 }
2012         }
2013         return 0;
2014 }
2015
2016 /**
2017  * proc_dointvec_minmax - read a vector of integers with min/max values
2018  * @table: the sysctl table
2019  * @write: %TRUE if this is a write to the sysctl file
2020  * @filp: the file structure
2021  * @buffer: the user buffer
2022  * @lenp: the size of the user buffer
2023  * @ppos: file position
2024  *
2025  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2026  * values from/to the user buffer, treated as an ASCII string.
2027  *
2028  * This routine will ensure the values are within the range specified by
2029  * table->extra1 (min) and table->extra2 (max).
2030  *
2031  * Returns 0 on success.
2032  */
2033 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2034                   void __user *buffer, size_t *lenp, loff_t *ppos)
2035 {
2036         struct do_proc_dointvec_minmax_conv_param param = {
2037                 .min = (int *) table->extra1,
2038                 .max = (int *) table->extra2,
2039         };
2040         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2041                                 do_proc_dointvec_minmax_conv, &param);
2042 }
2043
2044 static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write,
2045                                      struct file *filp,
2046                                      void __user *buffer,
2047                                      size_t *lenp, loff_t *ppos,
2048                                      unsigned long convmul,
2049                                      unsigned long convdiv)
2050 {
2051 #define TMPBUFLEN 21
2052         unsigned long *i, *min, *max, val;
2053         int vleft, first=1, neg;
2054         size_t len, left;
2055         char buf[TMPBUFLEN], *p;
2056         char __user *s = buffer;
2057
2058         if (!data || !table->maxlen || !*lenp ||
2059             (*ppos && !write)) {
2060                 *lenp = 0;
2061                 return 0;
2062         }
2063
2064         i = (unsigned long *) data;
2065         min = (unsigned long *) table->extra1;
2066         max = (unsigned long *) table->extra2;
2067         vleft = table->maxlen / sizeof(unsigned long);
2068         left = *lenp;
2069
2070         for (; left && vleft--; i++, min++, max++, first=0) {
2071                 if (write) {
2072                         while (left) {
2073                                 char c;
2074                                 if (get_user(c, s))
2075                                         return -EFAULT;
2076                                 if (!isspace(c))
2077                                         break;
2078                                 left--;
2079                                 s++;
2080                         }
2081                         if (!left)
2082                                 break;
2083                         neg = 0;
2084                         len = left;
2085                         if (len > TMPBUFLEN-1)
2086                                 len = TMPBUFLEN-1;
2087                         if (copy_from_user(buf, s, len))
2088                                 return -EFAULT;
2089                         buf[len] = 0;
2090                         p = buf;
2091                         if (*p == '-' && left > 1) {
2092                                 neg = 1;
2093                                 p++;
2094                         }
2095                         if (*p < '0' || *p > '9')
2096                                 break;
2097                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2098                         len = p-buf;
2099                         if ((len < left) && *p && !isspace(*p))
2100                                 break;
2101                         if (neg)
2102                                 val = -val;
2103                         s += len;
2104                         left -= len;
2105
2106                         if(neg)
2107                                 continue;
2108                         if ((min && val < *min) || (max && val > *max))
2109                                 continue;
2110                         *i = val;
2111                 } else {
2112                         p = buf;
2113                         if (!first)
2114                                 *p++ = '\t';
2115                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2116                         len = strlen(buf);
2117                         if (len > left)
2118                                 len = left;
2119                         if(copy_to_user(s, buf, len))
2120                                 return -EFAULT;
2121                         left -= len;
2122                         s += len;
2123                 }
2124         }
2125
2126         if (!write && !first && left) {
2127                 if(put_user('\n', s))
2128                         return -EFAULT;
2129                 left--, s++;
2130         }
2131         if (write) {
2132                 while (left) {
2133                         char c;
2134                         if (get_user(c, s++))
2135                                 return -EFAULT;
2136                         if (!isspace(c))
2137                                 break;
2138                         left--;
2139                 }
2140         }
2141         if (write && first)
2142                 return -EINVAL;
2143         *lenp -= left;
2144         *ppos += *lenp;
2145         return 0;
2146 #undef TMPBUFLEN
2147 }
2148
2149 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
2150                                      struct file *filp,
2151                                      void __user *buffer,
2152                                      size_t *lenp, loff_t *ppos,
2153                                      unsigned long convmul,
2154                                      unsigned long convdiv)
2155 {
2156         return __do_proc_doulongvec_minmax(table->data, table, write,
2157                         filp, buffer, lenp, ppos, convmul, convdiv);
2158 }
2159
2160 /**
2161  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2162  * @table: the sysctl table
2163  * @write: %TRUE if this is a write to the sysctl file
2164  * @filp: the file structure
2165  * @buffer: the user buffer
2166  * @lenp: the size of the user buffer
2167  * @ppos: file position
2168  *
2169  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2170  * values from/to the user buffer, treated as an ASCII string.
2171  *
2172  * This routine will ensure the values are within the range specified by
2173  * table->extra1 (min) and table->extra2 (max).
2174  *
2175  * Returns 0 on success.
2176  */
2177 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2178                            void __user *buffer, size_t *lenp, loff_t *ppos)
2179 {
2180     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2181 }
2182
2183 /**
2184  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2185  * @table: the sysctl table
2186  * @write: %TRUE if this is a write to the sysctl file
2187  * @filp: the file structure
2188  * @buffer: the user buffer
2189  * @lenp: the size of the user buffer
2190  * @ppos: file position
2191  *
2192  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2193  * values from/to the user buffer, treated as an ASCII string. The values
2194  * are treated as milliseconds, and converted to jiffies when they are stored.
2195  *
2196  * This routine will ensure the values are within the range specified by
2197  * table->extra1 (min) and table->extra2 (max).
2198  *
2199  * Returns 0 on success.
2200  */
2201 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2202                                       struct file *filp,
2203                                       void __user *buffer,
2204                                       size_t *lenp, loff_t *ppos)
2205 {
2206     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2207                                      lenp, ppos, HZ, 1000l);
2208 }
2209
2210
2211 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2212                                          int *valp,
2213                                          int write, void *data)
2214 {
2215         if (write) {
2216                 if (*lvalp > LONG_MAX / HZ)
2217                         return 1;
2218                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2219         } else {
2220                 int val = *valp;
2221                 unsigned long lval;
2222                 if (val < 0) {
2223                         *negp = -1;
2224                         lval = (unsigned long)-val;
2225                 } else {
2226                         *negp = 0;
2227                         lval = (unsigned long)val;
2228                 }
2229                 *lvalp = lval / HZ;
2230         }
2231         return 0;
2232 }
2233
2234 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2235                                                 int *valp,
2236                                                 int write, void *data)
2237 {
2238         if (write) {
2239                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2240                         return 1;
2241                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2242         } else {
2243                 int val = *valp;
2244                 unsigned long lval;
2245                 if (val < 0) {
2246                         *negp = -1;
2247                         lval = (unsigned long)-val;
2248                 } else {
2249                         *negp = 0;
2250                         lval = (unsigned long)val;
2251                 }
2252                 *lvalp = jiffies_to_clock_t(lval);
2253         }
2254         return 0;
2255 }
2256
2257 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2258                                             int *valp,
2259                                             int write, void *data)
2260 {
2261         if (write) {
2262                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2263         } else {
2264                 int val = *valp;
2265                 unsigned long lval;
2266                 if (val < 0) {
2267                         *negp = -1;
2268                         lval = (unsigned long)-val;
2269                 } else {
2270                         *negp = 0;
2271                         lval = (unsigned long)val;
2272                 }
2273                 *lvalp = jiffies_to_msecs(lval);
2274         }
2275         return 0;
2276 }
2277
2278 /**
2279  * proc_dointvec_jiffies - read a vector of integers as seconds
2280  * @table: the sysctl table
2281  * @write: %TRUE if this is a write to the sysctl file
2282  * @filp: the file structure
2283  * @buffer: the user buffer
2284  * @lenp: the size of the user buffer
2285  * @ppos: file position
2286  *
2287  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2288  * values from/to the user buffer, treated as an ASCII string.
2289  * The values read are assumed to be in seconds, and are converted into
2290  * jiffies.
2291  *
2292  * Returns 0 on success.
2293  */
2294 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2295                           void __user *buffer, size_t *lenp, loff_t *ppos)
2296 {
2297     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2298                             do_proc_dointvec_jiffies_conv,NULL);
2299 }
2300
2301 /**
2302  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2303  * @table: the sysctl table
2304  * @write: %TRUE if this is a write to the sysctl file
2305  * @filp: the file structure
2306  * @buffer: the user buffer
2307  * @lenp: the size of the user buffer
2308  * @ppos: pointer to the file position
2309  *
2310  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2311  * values from/to the user buffer, treated as an ASCII string.
2312  * The values read are assumed to be in 1/USER_HZ seconds, and
2313  * are converted into jiffies.
2314  *
2315  * Returns 0 on success.
2316  */
2317 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2318                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2319 {
2320     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2321                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2322 }
2323
2324 /**
2325  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2326  * @table: the sysctl table
2327  * @write: %TRUE if this is a write to the sysctl file
2328  * @filp: the file structure
2329  * @buffer: the user buffer
2330  * @lenp: the size of the user buffer
2331  * @ppos: file position
2332  * @ppos: the current position in the file
2333  *
2334  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2335  * values from/to the user buffer, treated as an ASCII string.
2336  * The values read are assumed to be in 1/1000 seconds, and
2337  * are converted into jiffies.
2338  *
2339  * Returns 0 on success.
2340  */
2341 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2342                              void __user *buffer, size_t *lenp, loff_t *ppos)
2343 {
2344         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2345                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2346 }
2347
2348 #ifdef CONFIG_SYSVIPC
2349 static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
2350         void __user *buffer, size_t *lenp, loff_t *ppos)
2351 {
2352         void *which;
2353         which = get_ipc(table, write);
2354         return __do_proc_dointvec(which, table, write, filp, buffer,
2355                         lenp, ppos, NULL, NULL);
2356 }
2357
2358 static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
2359         struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
2360 {
2361         void *which;
2362         which = get_ipc(table, write);
2363         return __do_proc_doulongvec_minmax(which, table, write, filp, buffer,
2364                         lenp, ppos, 1l, 1l);
2365 }
2366
2367 #endif
2368
2369 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
2370                            void __user *buffer, size_t *lenp, loff_t *ppos)
2371 {
2372         struct pid *new_pid;
2373         pid_t tmp;
2374         int r;
2375
2376         tmp = pid_nr(cad_pid);
2377
2378         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2379                                lenp, ppos, NULL, NULL);
2380         if (r || !write)
2381                 return r;
2382
2383         new_pid = find_get_pid(tmp);
2384         if (!new_pid)
2385                 return -ESRCH;
2386
2387         put_pid(xchg(&cad_pid, new_pid));
2388         return 0;
2389 }
2390
2391 #else /* CONFIG_PROC_FS */
2392
2393 int proc_dostring(ctl_table *table, int write, struct file *filp,
2394                   void __user *buffer, size_t *lenp, loff_t *ppos)
2395 {
2396         return -ENOSYS;
2397 }
2398
2399 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
2400                 void __user *buffer, size_t *lenp, loff_t *ppos)
2401 {
2402         return -ENOSYS;
2403 }
2404
2405 #ifdef CONFIG_SYSVIPC
2406 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
2407                 void __user *buffer, size_t *lenp, loff_t *ppos)
2408 {
2409         return -ENOSYS;
2410 }
2411 #endif
2412
2413 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2414                   void __user *buffer, size_t *lenp, loff_t *ppos)
2415 {
2416         return -ENOSYS;
2417 }
2418
2419 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2420                         void __user *buffer, size_t *lenp, loff_t *ppos)
2421 {
2422         return -ENOSYS;
2423 }
2424
2425 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2426                     void __user *buffer, size_t *lenp, loff_t *ppos)
2427 {
2428         return -ENOSYS;
2429 }
2430
2431 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2432                     void __user *buffer, size_t *lenp, loff_t *ppos)
2433 {
2434         return -ENOSYS;
2435 }
2436
2437 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2438                     void __user *buffer, size_t *lenp, loff_t *ppos)
2439 {
2440         return -ENOSYS;
2441 }
2442
2443 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2444                              void __user *buffer, size_t *lenp, loff_t *ppos)
2445 {
2446         return -ENOSYS;
2447 }
2448
2449 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2450                     void __user *buffer, size_t *lenp, loff_t *ppos)
2451 {
2452         return -ENOSYS;
2453 }
2454
2455 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2456                                       struct file *filp,
2457                                       void __user *buffer,
2458                                       size_t *lenp, loff_t *ppos)
2459 {
2460     return -ENOSYS;
2461 }
2462
2463
2464 #endif /* CONFIG_PROC_FS */
2465
2466
2467 #ifdef CONFIG_SYSCTL_SYSCALL
2468 /*
2469  * General sysctl support routines
2470  */
2471
2472 /* The generic string strategy routine: */
2473 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2474                   void __user *oldval, size_t __user *oldlenp,
2475                   void __user *newval, size_t newlen, void **context)
2476 {
2477         if (!table->data || !table->maxlen)
2478                 return -ENOTDIR;
2479
2480         if (oldval && oldlenp) {
2481                 size_t bufsize;
2482                 if (get_user(bufsize, oldlenp))
2483                         return -EFAULT;
2484                 if (bufsize) {
2485                         size_t len = strlen(table->data), copied;
2486
2487                         /* This shouldn't trigger for a well-formed sysctl */
2488                         if (len > table->maxlen)
2489                                 len = table->maxlen;
2490
2491                         /* Copy up to a max of bufsize-1 bytes of the string */
2492                         copied = (len >= bufsize) ? bufsize - 1 : len;
2493
2494                         if (copy_to_user(oldval, table->data, copied) ||
2495                             put_user(0, (char __user *)(oldval + copied)))
2496                                 return -EFAULT;
2497                         if (put_user(len, oldlenp))
2498                                 return -EFAULT;
2499                 }
2500         }
2501         if (newval && newlen) {
2502                 size_t len = newlen;
2503                 if (len > table->maxlen)
2504                         len = table->maxlen;
2505                 if(copy_from_user(table->data, newval, len))
2506                         return -EFAULT;
2507                 if (len == table->maxlen)
2508                         len--;
2509                 ((char *) table->data)[len] = 0;
2510         }
2511         return 1;
2512 }
2513
2514 /*
2515  * This function makes sure that all of the integers in the vector
2516  * are between the minimum and maximum values given in the arrays
2517  * table->extra1 and table->extra2, respectively.
2518  */
2519 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2520                 void __user *oldval, size_t __user *oldlenp,
2521                 void __user *newval, size_t newlen, void **context)
2522 {
2523
2524         if (newval && newlen) {
2525                 int __user *vec = (int __user *) newval;
2526                 int *min = (int *) table->extra1;
2527                 int *max = (int *) table->extra2;
2528                 size_t length;
2529                 int i;
2530
2531                 if (newlen % sizeof(int) != 0)
2532                         return -EINVAL;
2533
2534                 if (!table->extra1 && !table->extra2)
2535                         return 0;
2536
2537                 if (newlen > table->maxlen)
2538                         newlen = table->maxlen;
2539                 length = newlen / sizeof(int);
2540
2541                 for (i = 0; i < length; i++) {
2542                         int value;
2543                         if (get_user(value, vec + i))
2544                                 return -EFAULT;
2545                         if (min && value < min[i])
2546                                 return -EINVAL;
2547                         if (max && value > max[i])
2548                                 return -EINVAL;
2549                 }
2550         }
2551         return 0;
2552 }
2553
2554 /* Strategy function to convert jiffies to seconds */
2555 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2556                 void __user *oldval, size_t __user *oldlenp,
2557                 void __user *newval, size_t newlen, void **context)
2558 {
2559         if (oldval) {
2560                 size_t olen;
2561                 if (oldlenp) {
2562                         if (get_user(olen, oldlenp))
2563                                 return -EFAULT;
2564                         if (olen!=sizeof(int))
2565                                 return -EINVAL;
2566                 }
2567                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2568                     (oldlenp && put_user(sizeof(int),oldlenp)))
2569                         return -EFAULT;
2570         }
2571         if (newval && newlen) {
2572                 int new;
2573                 if (newlen != sizeof(int))
2574                         return -EINVAL;
2575                 if (get_user(new, (int __user *)newval))
2576                         return -EFAULT;
2577                 *(int *)(table->data) = new*HZ;
2578         }
2579         return 1;
2580 }
2581
2582 /* Strategy function to convert jiffies to seconds */
2583 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2584                 void __user *oldval, size_t __user *oldlenp,
2585                 void __user *newval, size_t newlen, void **context)
2586 {
2587         if (oldval) {
2588                 size_t olen;
2589                 if (oldlenp) {
2590                         if (get_user(olen, oldlenp))
2591                                 return -EFAULT;
2592                         if (olen!=sizeof(int))
2593                                 return -EINVAL;
2594                 }
2595                 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2596                     (oldlenp && put_user(sizeof(int),oldlenp)))
2597                         return -EFAULT;
2598         }
2599         if (newval && newlen) {
2600                 int new;
2601                 if (newlen != sizeof(int))
2602                         return -EINVAL;
2603                 if (get_user(new, (int __user *)newval))
2604                         return -EFAULT;
2605                 *(int *)(table->data) = msecs_to_jiffies(new);
2606         }
2607         return 1;
2608 }
2609
2610
2611 /* The generic string strategy routine: */
2612 static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
2613                   void __user *oldval, size_t __user *oldlenp,
2614                   void __user *newval, size_t newlen, void **context)
2615 {
2616         struct ctl_table uts_table;
2617         int r, write;
2618         write = newval && newlen;
2619         memcpy(&uts_table, table, sizeof(uts_table));
2620         uts_table.data = get_uts(table, write);
2621         r = sysctl_string(&uts_table, name, nlen,
2622                 oldval, oldlenp, newval, newlen, context);
2623         put_uts(table, write, uts_table.data);
2624         return r;
2625 }
2626
2627 #ifdef CONFIG_SYSVIPC
2628 /* The generic sysctl ipc data routine. */
2629 static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
2630                 void __user *oldval, size_t __user *oldlenp,
2631                 void __user *newval, size_t newlen, void **context)
2632 {
2633         size_t len;
2634         void *data;
2635
2636         /* Get out of I don't have a variable */
2637         if (!table->data || !table->maxlen)
2638                 return -ENOTDIR;
2639
2640         data = get_ipc(table, 1);
2641         if (!data)
2642                 return -ENOTDIR;
2643
2644         if (oldval && oldlenp) {
2645                 if (get_user(len, oldlenp))
2646                         return -EFAULT;
2647                 if (len) {
2648                         if (len > table->maxlen)
2649                                 len = table->maxlen;
2650                         if (copy_to_user(oldval, data, len))
2651                                 return -EFAULT;
2652                         if (put_user(len, oldlenp))
2653                                 return -EFAULT;
2654                 }
2655         }
2656
2657         if (newval && newlen) {
2658                 if (newlen > table->maxlen)
2659                         newlen = table->maxlen;
2660
2661                 if (copy_from_user(data, newval, newlen))
2662                         return -EFAULT;
2663         }
2664         return 1;
2665 }
2666 #endif
2667
2668 #else /* CONFIG_SYSCTL_SYSCALL */
2669
2670
2671 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2672 {
2673         static int msg_count;
2674         struct __sysctl_args tmp;
2675         int name[CTL_MAXNAME];
2676         int i;
2677
2678         /* Read in the sysctl name for better debug message logging */
2679         if (copy_from_user(&tmp, args, sizeof(tmp)))
2680                 return -EFAULT;
2681         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2682                 return -ENOTDIR;
2683         for (i = 0; i < tmp.nlen; i++)
2684                 if (get_user(name[i], tmp.name + i))
2685                         return -EFAULT;
2686
2687         /* Ignore accesses to kernel.version */
2688         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2689                 goto out;
2690
2691         if (msg_count < 5) {
2692                 msg_count++;
2693                 printk(KERN_INFO
2694                         "warning: process `%s' used the removed sysctl "
2695                         "system call with ", current->comm);
2696                 for (i = 0; i < tmp.nlen; i++)
2697                         printk("%d.", name[i]);
2698                 printk("\n");
2699         }
2700 out:
2701         return -ENOSYS;
2702 }
2703
2704 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2705                   void __user *oldval, size_t __user *oldlenp,
2706                   void __user *newval, size_t newlen, void **context)
2707 {
2708         return -ENOSYS;
2709 }
2710
2711 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2712                 void __user *oldval, size_t __user *oldlenp,
2713                 void __user *newval, size_t newlen, void **context)
2714 {
2715         return -ENOSYS;
2716 }
2717
2718 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2719                 void __user *oldval, size_t __user *oldlenp,
2720                 void __user *newval, size_t newlen, void **context)
2721 {
2722         return -ENOSYS;
2723 }
2724
2725 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2726                 void __user *oldval, size_t __user *oldlenp,
2727                 void __user *newval, size_t newlen, void **context)
2728 {
2729         return -ENOSYS;
2730 }
2731
2732 static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
2733                   void __user *oldval, size_t __user *oldlenp,
2734                   void __user *newval, size_t newlen, void **context)
2735 {
2736         return -ENOSYS;
2737 }
2738 static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
2739                 void __user *oldval, size_t __user *oldlenp,
2740                 void __user *newval, size_t newlen, void **context)
2741 {
2742         return -ENOSYS;
2743 }
2744 #endif /* CONFIG_SYSCTL_SYSCALL */
2745
2746 /*
2747  * No sense putting this after each symbol definition, twice,
2748  * exception granted :-)
2749  */
2750 EXPORT_SYMBOL(proc_dointvec);
2751 EXPORT_SYMBOL(proc_dointvec_jiffies);
2752 EXPORT_SYMBOL(proc_dointvec_minmax);
2753 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2754 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2755 EXPORT_SYMBOL(proc_dostring);
2756 EXPORT_SYMBOL(proc_doulongvec_minmax);
2757 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2758 EXPORT_SYMBOL(register_sysctl_table);
2759 EXPORT_SYMBOL(sysctl_intvec);
2760 EXPORT_SYMBOL(sysctl_jiffies);
2761 EXPORT_SYMBOL(sysctl_ms_jiffies);
2762 EXPORT_SYMBOL(sysctl_string);
2763 EXPORT_SYMBOL(unregister_sysctl_table);