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/security.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/fs.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 #include <linux/reboot.h>
  49
  50 #include <asm/uaccess.h>
  51 #include <asm/processor.h>
  52
  53 #ifdef CONFIG_X86
  54 #include <asm/nmi.h>
  55 #include <asm/stacktrace.h>
  56 #include <asm/io.h>
  57 #endif
  58
  59 static int deprecated_sysctl_warning(struct __sysctl_args *args);
  60
  61 #if defined(CONFIG_SYSCTL)
  62
  63 /* External variables not in a header file. */
  64 extern int C_A_D;
  65 extern int print_fatal_signals;
  66 extern int sysctl_overcommit_memory;
  67 extern int sysctl_overcommit_ratio;
  68 extern int sysctl_panic_on_oom;
  69 extern int sysctl_oom_kill_allocating_task;
  70 extern int max_threads;
  71 extern int core_uses_pid;
  72 extern int suid_dumpable;
  73 extern char core_pattern[];
  74 extern int pid_max;
  75 extern int min_free_kbytes;
  76 extern int printk_ratelimit_jiffies;
  77 extern int printk_ratelimit_burst;
  78 extern int pid_max_min, pid_max_max;
  79 extern int sysctl_drop_caches;
  80 extern int percpu_pagelist_fraction;
  81 extern int compat_log;
  82 extern int maps_protect;
  83 extern int sysctl_stat_interval;
  84 extern int audit_argv_kb;
  85 extern int latencytop_enabled;
  86
  87 /* Constants used for minimum and  maximum */
  88 #ifdef CONFIG_DETECT_SOFTLOCKUP
  89 static int one = 1;
  90 static int sixty = 60;
  91 #endif
  92
  93 #ifdef CONFIG_MMU
  94 static int two = 2;
  95 #endif
  96
  97 static int zero;
  98 static int one_hundred = 100;
  99
 100 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 101 static int maxolduid = 65535;
 102 static int minolduid;
 103 static int min_percpu_pagelist_fract = 8;
 104
 105 static int ngroups_max = NGROUPS_MAX;
 106
 107 #ifdef CONFIG_KMOD
 108 extern char modprobe_path[];
 109 #endif
 110 #ifdef CONFIG_CHR_DEV_SG
 111 extern int sg_big_buff;
 112 #endif
 113
 114 #ifdef __sparc__
 115 extern char reboot_command [];
 116 extern int stop_a_enabled;
 117 extern int scons_pwroff;
 118 #endif
 119
 120 #ifdef __hppa__
 121 extern int pwrsw_enabled;
 122 extern int unaligned_enabled;
 123 #endif
 124
 125 #ifdef CONFIG_S390
 126 #ifdef CONFIG_MATHEMU
 127 extern int sysctl_ieee_emulation_warnings;
 128 #endif
 129 extern int sysctl_userprocess_debug;
 130 extern int spin_retry;
 131 #endif
 132
 133 extern int sysctl_hz_timer;
 134
 135 #ifdef CONFIG_BSD_PROCESS_ACCT
 136 extern int acct_parm[];
 137 #endif
 138
 139 #ifdef CONFIG_IA64
 140 extern int no_unaligned_warning;
 141 #endif
 142
 143 #ifdef CONFIG_RT_MUTEXES
 144 extern int max_lock_depth;
 145 #endif
 146
 147 #ifdef CONFIG_SYSCTL_SYSCALL
 148 static int parse_table(int __user *, int, void __user *, size_t __user *,
 149                 void __user *, size_t, struct ctl_table *);
 150 #endif
 151
 152
 153 #ifdef CONFIG_PROC_SYSCTL
 154 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 155                   void __user *buffer, size_t *lenp, loff_t *ppos);
 156 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
 157                                void __user *buffer, size_t *lenp, loff_t *ppos);
 158 #endif
 159
 160 static struct ctl_table root_table[];
 161 static struct ctl_table_root sysctl_table_root;
 162 static struct ctl_table_header root_table_header = {
 163         .ctl_table = root_table,
 164         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
 165         .root = &sysctl_table_root,
 166 };
 167 static struct ctl_table_root sysctl_table_root = {
 168         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
 169         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
 170 };
 171
 172 static struct ctl_table kern_table[];
 173 static struct ctl_table vm_table[];
 174 static struct ctl_table fs_table[];
 175 static struct ctl_table debug_table[];
 176 static struct ctl_table dev_table[];
 177 extern struct ctl_table random_table[];
 178 #ifdef CONFIG_INOTIFY_USER
 179 extern struct ctl_table inotify_table[];
 180 #endif
 181
 182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 183 int sysctl_legacy_va_layout;
 184 #endif
 185
 186 extern int prove_locking;
 187 extern int lock_stat;
 188
 189 /* The default sysctl tables: */
 190
 191 static struct ctl_table root_table[] = {
 192         {
 193                 .ctl_name       = CTL_KERN,
 194                 .procname       = "kernel",
 195                 .mode           = 0555,
 196                 .child          = kern_table,
 197         },
 198         {
 199                 .ctl_name       = CTL_VM,
 200                 .procname       = "vm",
 201                 .mode           = 0555,
 202                 .child          = vm_table,
 203         },
 204         {
 205                 .ctl_name       = CTL_FS,
 206                 .procname       = "fs",
 207                 .mode           = 0555,
 208                 .child          = fs_table,
 209         },
 210         {
 211                 .ctl_name       = CTL_DEBUG,
 212                 .procname       = "debug",
 213                 .mode           = 0555,
 214                 .child          = debug_table,
 215         },
 216         {
 217                 .ctl_name       = CTL_DEV,
 218                 .procname       = "dev",
 219                 .mode           = 0555,
 220                 .child          = dev_table,
 221         },
 222 /*
 223  * NOTE: do not add new entries to this table unless you have read
 224  * Documentation/sysctl/ctl_unnumbered.txt
 225  */
 226         { .ctl_name = 0 }
 227 };
 228
 229 #ifdef CONFIG_SCHED_DEBUG
 230 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 231 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 232 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 233 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 234 #endif
 235
 236 static struct ctl_table kern_table[] = {
 237 #ifdef CONFIG_SCHED_DEBUG
 238         {
 239                 .ctl_name       = CTL_UNNUMBERED,
 240                 .procname       = "sched_min_granularity_ns",
 241                 .data           = &sysctl_sched_min_granularity,
 242                 .maxlen         = sizeof(unsigned int),
 243                 .mode           = 0644,
 244                 .proc_handler   = &sched_nr_latency_handler,
 245                 .strategy       = &sysctl_intvec,
 246                 .extra1         = &min_sched_granularity_ns,
 247                 .extra2         = &max_sched_granularity_ns,
 248         },
 249         {
 250                 .ctl_name       = CTL_UNNUMBERED,
 251                 .procname       = "sched_latency_ns",
 252                 .data           = &sysctl_sched_latency,
 253                 .maxlen         = sizeof(unsigned int),
 254                 .mode           = 0644,
 255                 .proc_handler   = &sched_nr_latency_handler,
 256                 .strategy       = &sysctl_intvec,
 257                 .extra1         = &min_sched_granularity_ns,
 258                 .extra2         = &max_sched_granularity_ns,
 259         },
 260         {
 261                 .ctl_name       = CTL_UNNUMBERED,
 262                 .procname       = "sched_wakeup_granularity_ns",
 263                 .data           = &sysctl_sched_wakeup_granularity,
 264                 .maxlen         = sizeof(unsigned int),
 265                 .mode           = 0644,
 266                 .proc_handler   = &proc_dointvec_minmax,
 267                 .strategy       = &sysctl_intvec,
 268                 .extra1         = &min_wakeup_granularity_ns,
 269                 .extra2         = &max_wakeup_granularity_ns,
 270         },
 271         {
 272                 .ctl_name       = CTL_UNNUMBERED,
 273                 .procname       = "sched_batch_wakeup_granularity_ns",
 274                 .data           = &sysctl_sched_batch_wakeup_granularity,
 275                 .maxlen         = sizeof(unsigned int),
 276                 .mode           = 0644,
 277                 .proc_handler   = &proc_dointvec_minmax,
 278                 .strategy       = &sysctl_intvec,
 279                 .extra1         = &min_wakeup_granularity_ns,
 280                 .extra2         = &max_wakeup_granularity_ns,
 281         },
 282         {
 283                 .ctl_name       = CTL_UNNUMBERED,
 284                 .procname       = "sched_child_runs_first",
 285                 .data           = &sysctl_sched_child_runs_first,
 286                 .maxlen         = sizeof(unsigned int),
 287                 .mode           = 0644,
 288                 .proc_handler   = &proc_dointvec,
 289         },
 290         {
 291                 .ctl_name       = CTL_UNNUMBERED,
 292                 .procname       = "sched_features",
 293                 .data           = &sysctl_sched_features,
 294                 .maxlen         = sizeof(unsigned int),
 295                 .mode           = 0644,
 296                 .proc_handler   = &proc_dointvec,
 297         },
 298         {
 299                 .ctl_name       = CTL_UNNUMBERED,
 300                 .procname       = "sched_migration_cost",
 301                 .data           = &sysctl_sched_migration_cost,
 302                 .maxlen         = sizeof(unsigned int),
 303                 .mode           = 0644,
 304                 .proc_handler   = &proc_dointvec,
 305         },
 306         {
 307                 .ctl_name       = CTL_UNNUMBERED,
 308                 .procname       = "sched_nr_migrate",
 309                 .data           = &sysctl_sched_nr_migrate,
 310                 .maxlen         = sizeof(unsigned int),
 311                 .mode           = 0644,
 312                 .proc_handler   = &proc_dointvec,
 313         },
 314         {
 315                 .ctl_name       = CTL_UNNUMBERED,
 316                 .procname       = "sched_rt_period_ms",
 317                 .data           = &sysctl_sched_rt_period,
 318                 .maxlen         = sizeof(unsigned int),
 319                 .mode           = 0644,
 320                 .proc_handler   = &proc_dointvec,
 321         },
 322         {
 323                 .ctl_name       = CTL_UNNUMBERED,
 324                 .procname       = "sched_rt_ratio",
 325                 .data           = &sysctl_sched_rt_ratio,
 326                 .maxlen         = sizeof(unsigned int),
 327                 .mode           = 0644,
 328                 .proc_handler   = &proc_dointvec,
 329         },
 330 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
 331         {
 332                 .ctl_name       = CTL_UNNUMBERED,
 333                 .procname       = "sched_min_bal_int_shares",
 334                 .data           = &sysctl_sched_min_bal_int_shares,
 335                 .maxlen         = sizeof(unsigned int),
 336                 .mode           = 0644,
 337                 .proc_handler   = &proc_dointvec,
 338         },
 339         {
 340                 .ctl_name       = CTL_UNNUMBERED,
 341                 .procname       = "sched_max_bal_int_shares",
 342                 .data           = &sysctl_sched_max_bal_int_shares,
 343                 .maxlen         = sizeof(unsigned int),
 344                 .mode           = 0644,
 345                 .proc_handler   = &proc_dointvec,
 346         },
 347 #endif
 348 #endif
 349         {
 350                 .ctl_name       = CTL_UNNUMBERED,
 351                 .procname       = "sched_compat_yield",
 352                 .data           = &sysctl_sched_compat_yield,
 353                 .maxlen         = sizeof(unsigned int),
 354                 .mode           = 0644,
 355                 .proc_handler   = &proc_dointvec,
 356         },
 357 #ifdef CONFIG_PROVE_LOCKING
 358         {
 359                 .ctl_name       = CTL_UNNUMBERED,
 360                 .procname       = "prove_locking",
 361                 .data           = &prove_locking,
 362                 .maxlen         = sizeof(int),
 363                 .mode           = 0644,
 364                 .proc_handler   = &proc_dointvec,
 365         },
 366 #endif
 367 #ifdef CONFIG_LOCK_STAT
 368         {
 369                 .ctl_name       = CTL_UNNUMBERED,
 370                 .procname       = "lock_stat",
 371                 .data           = &lock_stat,
 372                 .maxlen         = sizeof(int),
 373                 .mode           = 0644,
 374                 .proc_handler   = &proc_dointvec,
 375         },
 376 #endif
 377         {
 378                 .ctl_name       = KERN_PANIC,
 379                 .procname       = "panic",
 380                 .data           = &panic_timeout,
 381                 .maxlen         = sizeof(int),
 382                 .mode           = 0644,
 383                 .proc_handler   = &proc_dointvec,
 384         },
 385         {
 386                 .ctl_name       = KERN_CORE_USES_PID,
 387                 .procname       = "core_uses_pid",
 388                 .data           = &core_uses_pid,
 389                 .maxlen         = sizeof(int),
 390                 .mode           = 0644,
 391                 .proc_handler   = &proc_dointvec,
 392         },
 393 #ifdef CONFIG_AUDITSYSCALL
 394         {
 395                 .ctl_name       = CTL_UNNUMBERED,
 396                 .procname       = "audit_argv_kb",
 397                 .data           = &audit_argv_kb,
 398                 .maxlen         = sizeof(int),
 399                 .mode           = 0644,
 400                 .proc_handler   = &proc_dointvec,
 401         },
 402 #endif
 403         {
 404                 .ctl_name       = KERN_CORE_PATTERN,
 405                 .procname       = "core_pattern",
 406                 .data           = core_pattern,
 407                 .maxlen         = CORENAME_MAX_SIZE,
 408                 .mode           = 0644,
 409                 .proc_handler   = &proc_dostring,
 410                 .strategy       = &sysctl_string,
 411         },
 412 #ifdef CONFIG_PROC_SYSCTL
 413         {
 414                 .procname       = "tainted",
 415                 .data           = &tainted,
 416                 .maxlen         = sizeof(int),
 417                 .mode           = 0644,
 418                 .proc_handler   = &proc_dointvec_taint,
 419         },
 420 #endif
 421 #ifdef CONFIG_LATENCYTOP
 422         {
 423                 .procname       = "latencytop",
 424                 .data           = &latencytop_enabled,
 425                 .maxlen         = sizeof(int),
 426                 .mode           = 0644,
 427                 .proc_handler   = &proc_dointvec,
 428         },
 429 #endif
 430 #ifdef CONFIG_SECURITY_CAPABILITIES
 431         {
 432                 .procname       = "cap-bound",
 433                 .data           = &cap_bset,
 434                 .maxlen         = sizeof(kernel_cap_t),
 435                 .mode           = 0600,
 436                 .proc_handler   = &proc_dointvec_bset,
 437         },
 438 #endif /* def CONFIG_SECURITY_CAPABILITIES */
 439 #ifdef CONFIG_BLK_DEV_INITRD
 440         {
 441                 .ctl_name       = KERN_REALROOTDEV,
 442                 .procname       = "real-root-dev",
 443                 .data           = &real_root_dev,
 444                 .maxlen         = sizeof(int),
 445                 .mode           = 0644,
 446                 .proc_handler   = &proc_dointvec,
 447         },
 448 #endif
 449         {
 450                 .ctl_name       = CTL_UNNUMBERED,
 451                 .procname       = "print-fatal-signals",
 452                 .data           = &print_fatal_signals,
 453                 .maxlen         = sizeof(int),
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dointvec,
 456         },
 457 #ifdef __sparc__
 458         {
 459                 .ctl_name       = KERN_SPARC_REBOOT,
 460                 .procname       = "reboot-cmd",
 461                 .data           = reboot_command,
 462                 .maxlen         = 256,
 463                 .mode           = 0644,
 464                 .proc_handler   = &proc_dostring,
 465                 .strategy       = &sysctl_string,
 466         },
 467         {
 468                 .ctl_name       = KERN_SPARC_STOP_A,
 469                 .procname       = "stop-a",
 470                 .data           = &stop_a_enabled,
 471                 .maxlen         = sizeof (int),
 472                 .mode           = 0644,
 473                 .proc_handler   = &proc_dointvec,
 474         },
 475         {
 476                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 477                 .procname       = "scons-poweroff",
 478                 .data           = &scons_pwroff,
 479                 .maxlen         = sizeof (int),
 480                 .mode           = 0644,
 481                 .proc_handler   = &proc_dointvec,
 482         },
 483 #endif
 484 #ifdef __hppa__
 485         {
 486                 .ctl_name       = KERN_HPPA_PWRSW,
 487                 .procname       = "soft-power",
 488                 .data           = &pwrsw_enabled,
 489                 .maxlen         = sizeof (int),
 490                 .mode           = 0644,
 491                 .proc_handler   = &proc_dointvec,
 492         },
 493         {
 494                 .ctl_name       = KERN_HPPA_UNALIGNED,
 495                 .procname       = "unaligned-trap",
 496                 .data           = &unaligned_enabled,
 497                 .maxlen         = sizeof (int),
 498                 .mode           = 0644,
 499                 .proc_handler   = &proc_dointvec,
 500         },
 501 #endif
 502         {
 503                 .ctl_name       = KERN_CTLALTDEL,
 504                 .procname       = "ctrl-alt-del",
 505                 .data           = &C_A_D,
 506                 .maxlen         = sizeof(int),
 507                 .mode           = 0644,
 508                 .proc_handler   = &proc_dointvec,
 509         },
 510         {
 511                 .ctl_name       = KERN_PRINTK,
 512                 .procname       = "printk",
 513                 .data           = &console_loglevel,
 514                 .maxlen         = 4*sizeof(int),
 515                 .mode           = 0644,
 516                 .proc_handler   = &proc_dointvec,
 517         },
 518 #ifdef CONFIG_KMOD
 519         {
 520                 .ctl_name       = KERN_MODPROBE,
 521                 .procname       = "modprobe",
 522                 .data           = &modprobe_path,
 523                 .maxlen         = KMOD_PATH_LEN,
 524                 .mode           = 0644,
 525                 .proc_handler   = &proc_dostring,
 526                 .strategy       = &sysctl_string,
 527         },
 528 #endif
 529 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 530         {
 531                 .ctl_name       = KERN_HOTPLUG,
 532                 .procname       = "hotplug",
 533                 .data           = &uevent_helper,
 534                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 535                 .mode           = 0644,
 536                 .proc_handler   = &proc_dostring,
 537                 .strategy       = &sysctl_string,
 538         },
 539 #endif
 540 #ifdef CONFIG_CHR_DEV_SG
 541         {
 542                 .ctl_name       = KERN_SG_BIG_BUFF,
 543                 .procname       = "sg-big-buff",
 544                 .data           = &sg_big_buff,
 545                 .maxlen         = sizeof (int),
 546                 .mode           = 0444,
 547                 .proc_handler   = &proc_dointvec,
 548         },
 549 #endif
 550 #ifdef CONFIG_BSD_PROCESS_ACCT
 551         {
 552                 .ctl_name       = KERN_ACCT,
 553                 .procname       = "acct",
 554                 .data           = &acct_parm,
 555                 .maxlen         = 3*sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = &proc_dointvec,
 558         },
 559 #endif
 560 #ifdef CONFIG_MAGIC_SYSRQ
 561         {
 562                 .ctl_name       = KERN_SYSRQ,
 563                 .procname       = "sysrq",
 564                 .data           = &__sysrq_enabled,
 565                 .maxlen         = sizeof (int),
 566                 .mode           = 0644,
 567                 .proc_handler   = &proc_dointvec,
 568         },
 569 #endif
 570 #ifdef CONFIG_PROC_SYSCTL
 571         {
 572                 .procname       = "cad_pid",
 573                 .data           = NULL,
 574                 .maxlen         = sizeof (int),
 575                 .mode           = 0600,
 576                 .proc_handler   = &proc_do_cad_pid,
 577         },
 578 #endif
 579         {
 580                 .ctl_name       = KERN_MAX_THREADS,
 581                 .procname       = "threads-max",
 582                 .data           = &max_threads,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec,
 586         },
 587         {
 588                 .ctl_name       = KERN_RANDOM,
 589                 .procname       = "random",
 590                 .mode           = 0555,
 591                 .child          = random_table,
 592         },
 593         {
 594                 .ctl_name       = KERN_OVERFLOWUID,
 595                 .procname       = "overflowuid",
 596                 .data           = &overflowuid,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = &proc_dointvec_minmax,
 600                 .strategy       = &sysctl_intvec,
 601                 .extra1         = &minolduid,
 602                 .extra2         = &maxolduid,
 603         },
 604         {
 605                 .ctl_name       = KERN_OVERFLOWGID,
 606                 .procname       = "overflowgid",
 607                 .data           = &overflowgid,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec_minmax,
 611                 .strategy       = &sysctl_intvec,
 612                 .extra1         = &minolduid,
 613                 .extra2         = &maxolduid,
 614         },
 615 #ifdef CONFIG_S390
 616 #ifdef CONFIG_MATHEMU
 617         {
 618                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 619                 .procname       = "ieee_emulation_warnings",
 620                 .data           = &sysctl_ieee_emulation_warnings,
 621                 .maxlen         = sizeof(int),
 622                 .mode           = 0644,
 623                 .proc_handler   = &proc_dointvec,
 624         },
 625 #endif
 626 #ifdef CONFIG_NO_IDLE_HZ
 627         {
 628                 .ctl_name       = KERN_HZ_TIMER,
 629                 .procname       = "hz_timer",
 630                 .data           = &sysctl_hz_timer,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = &proc_dointvec,
 634         },
 635 #endif
 636         {
 637                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 638                 .procname       = "userprocess_debug",
 639                 .data           = &sysctl_userprocess_debug,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = &proc_dointvec,
 643         },
 644 #endif
 645         {
 646                 .ctl_name       = KERN_PIDMAX,
 647                 .procname       = "pid_max",
 648                 .data           = &pid_max,
 649                 .maxlen         = sizeof (int),
 650                 .mode           = 0644,
 651                 .proc_handler   = &proc_dointvec_minmax,
 652                 .strategy       = sysctl_intvec,
 653                 .extra1         = &pid_max_min,
 654                 .extra2         = &pid_max_max,
 655         },
 656         {
 657                 .ctl_name       = KERN_PANIC_ON_OOPS,
 658                 .procname       = "panic_on_oops",
 659                 .data           = &panic_on_oops,
 660                 .maxlen         = sizeof(int),
 661                 .mode           = 0644,
 662                 .proc_handler   = &proc_dointvec,
 663         },
 664         {
 665                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 666                 .procname       = "printk_ratelimit",
 667                 .data           = &printk_ratelimit_jiffies,
 668                 .maxlen         = sizeof(int),
 669                 .mode           = 0644,
 670                 .proc_handler   = &proc_dointvec_jiffies,
 671                 .strategy       = &sysctl_jiffies,
 672         },
 673         {
 674                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 675                 .procname       = "printk_ratelimit_burst",
 676                 .data           = &printk_ratelimit_burst,
 677                 .maxlen         = sizeof(int),
 678                 .mode           = 0644,
 679                 .proc_handler   = &proc_dointvec,
 680         },
 681         {
 682                 .ctl_name       = KERN_NGROUPS_MAX,
 683                 .procname       = "ngroups_max",
 684                 .data           = &ngroups_max,
 685                 .maxlen         = sizeof (int),
 686                 .mode           = 0444,
 687                 .proc_handler   = &proc_dointvec,
 688         },
 689 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 690         {
 691                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
 692                 .procname       = "unknown_nmi_panic",
 693                 .data           = &unknown_nmi_panic,
 694                 .maxlen         = sizeof (int),
 695                 .mode           = 0644,
 696                 .proc_handler   = &proc_dointvec,
 697         },
 698         {
 699                 .procname       = "nmi_watchdog",
 700                 .data           = &nmi_watchdog_enabled,
 701                 .maxlen         = sizeof (int),
 702                 .mode           = 0644,
 703                 .proc_handler   = &proc_nmi_enabled,
 704         },
 705 #endif
 706 #if defined(CONFIG_X86)
 707         {
 708                 .ctl_name       = KERN_PANIC_ON_NMI,
 709                 .procname       = "panic_on_unrecovered_nmi",
 710                 .data           = &panic_on_unrecovered_nmi,
 711                 .maxlen         = sizeof(int),
 712                 .mode           = 0644,
 713                 .proc_handler   = &proc_dointvec,
 714         },
 715         {
 716                 .ctl_name       = KERN_BOOTLOADER_TYPE,
 717                 .procname       = "bootloader_type",
 718                 .data           = &bootloader_type,
 719                 .maxlen         = sizeof (int),
 720                 .mode           = 0444,
 721                 .proc_handler   = &proc_dointvec,
 722         },
 723         {
 724                 .ctl_name       = CTL_UNNUMBERED,
 725                 .procname       = "kstack_depth_to_print",
 726                 .data           = &kstack_depth_to_print,
 727                 .maxlen         = sizeof(int),
 728                 .mode           = 0644,
 729                 .proc_handler   = &proc_dointvec,
 730         },
 731         {
 732                 .ctl_name       = CTL_UNNUMBERED,
 733                 .procname       = "io_delay_type",
 734                 .data           = &io_delay_type,
 735                 .maxlen         = sizeof(int),
 736                 .mode           = 0644,
 737                 .proc_handler   = &proc_dointvec,
 738         },
 739 #endif
 740 #if defined(CONFIG_MMU)
 741         {
 742                 .ctl_name       = KERN_RANDOMIZE,
 743                 .procname       = "randomize_va_space",
 744                 .data           = &randomize_va_space,
 745                 .maxlen         = sizeof(int),
 746                 .mode           = 0644,
 747                 .proc_handler   = &proc_dointvec,
 748         },
 749 #endif
 750 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 751         {
 752                 .ctl_name       = KERN_SPIN_RETRY,
 753                 .procname       = "spin_retry",
 754                 .data           = &spin_retry,
 755                 .maxlen         = sizeof (int),
 756                 .mode           = 0644,
 757                 .proc_handler   = &proc_dointvec,
 758         },
 759 #endif
 760 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 761         {
 762                 .procname       = "acpi_video_flags",
 763                 .data           = &acpi_realmode_flags,
 764                 .maxlen         = sizeof (unsigned long),
 765                 .mode           = 0644,
 766                 .proc_handler   = &proc_doulongvec_minmax,
 767         },
 768 #endif
 769 #ifdef CONFIG_IA64
 770         {
 771                 .ctl_name       = KERN_IA64_UNALIGNED,
 772                 .procname       = "ignore-unaligned-usertrap",
 773                 .data           = &no_unaligned_warning,
 774                 .maxlen         = sizeof (int),
 775                 .mode           = 0644,
 776                 .proc_handler   = &proc_dointvec,
 777         },
 778 #endif
 779 #ifdef CONFIG_DETECT_SOFTLOCKUP
 780         {
 781                 .ctl_name       = CTL_UNNUMBERED,
 782                 .procname       = "softlockup_thresh",
 783                 .data           = &softlockup_thresh,
 784                 .maxlen         = sizeof(unsigned long),
 785                 .mode           = 0644,
 786                 .proc_handler   = &proc_doulongvec_minmax,
 787                 .strategy       = &sysctl_intvec,
 788                 .extra1         = &one,
 789                 .extra2         = &sixty,
 790         },
 791         {
 792                 .ctl_name       = CTL_UNNUMBERED,
 793                 .procname       = "hung_task_check_count",
 794                 .data           = &sysctl_hung_task_check_count,
 795                 .maxlen         = sizeof(unsigned long),
 796                 .mode           = 0644,
 797                 .proc_handler   = &proc_doulongvec_minmax,
 798                 .strategy       = &sysctl_intvec,
 799         },
 800         {
 801                 .ctl_name       = CTL_UNNUMBERED,
 802                 .procname       = "hung_task_timeout_secs",
 803                 .data           = &sysctl_hung_task_timeout_secs,
 804                 .maxlen         = sizeof(unsigned long),
 805                 .mode           = 0644,
 806                 .proc_handler   = &proc_doulongvec_minmax,
 807                 .strategy       = &sysctl_intvec,
 808         },
 809         {
 810                 .ctl_name       = CTL_UNNUMBERED,
 811                 .procname       = "hung_task_warnings",
 812                 .data           = &sysctl_hung_task_warnings,
 813                 .maxlen         = sizeof(unsigned long),
 814                 .mode           = 0644,
 815                 .proc_handler   = &proc_doulongvec_minmax,
 816                 .strategy       = &sysctl_intvec,
 817         },
 818 #endif
 819 #ifdef CONFIG_COMPAT
 820         {
 821                 .ctl_name       = KERN_COMPAT_LOG,
 822                 .procname       = "compat-log",
 823                 .data           = &compat_log,
 824                 .maxlen         = sizeof (int),
 825                 .mode           = 0644,
 826                 .proc_handler   = &proc_dointvec,
 827         },
 828 #endif
 829 #ifdef CONFIG_RT_MUTEXES
 830         {
 831                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
 832                 .procname       = "max_lock_depth",
 833                 .data           = &max_lock_depth,
 834                 .maxlen         = sizeof(int),
 835                 .mode           = 0644,
 836                 .proc_handler   = &proc_dointvec,
 837         },
 838 #endif
 839 #ifdef CONFIG_PROC_FS
 840         {
 841                 .ctl_name       = CTL_UNNUMBERED,
 842                 .procname       = "maps_protect",
 843                 .data           = &maps_protect,
 844                 .maxlen         = sizeof(int),
 845                 .mode           = 0644,
 846                 .proc_handler   = &proc_dointvec,
 847         },
 848 #endif
 849         {
 850                 .ctl_name       = CTL_UNNUMBERED,
 851                 .procname       = "poweroff_cmd",
 852                 .data           = &poweroff_cmd,
 853                 .maxlen         = POWEROFF_CMD_PATH_LEN,
 854                 .mode           = 0644,
 855                 .proc_handler   = &proc_dostring,
 856                 .strategy       = &sysctl_string,
 857         },
 858 /*
 859  * NOTE: do not add new entries to this table unless you have read
 860  * Documentation/sysctl/ctl_unnumbered.txt
 861  */
 862         { .ctl_name = 0 }
 863 };
 864
 865 static struct ctl_table vm_table[] = {
 866         {
 867                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 868                 .procname       = "overcommit_memory",
 869                 .data           = &sysctl_overcommit_memory,
 870                 .maxlen         = sizeof(sysctl_overcommit_memory),
 871                 .mode           = 0644,
 872                 .proc_handler   = &proc_dointvec,
 873         },
 874         {
 875                 .ctl_name       = VM_PANIC_ON_OOM,
 876                 .procname       = "panic_on_oom",
 877                 .data           = &sysctl_panic_on_oom,
 878                 .maxlen         = sizeof(sysctl_panic_on_oom),
 879                 .mode           = 0644,
 880                 .proc_handler   = &proc_dointvec,
 881         },
 882         {
 883                 .ctl_name       = CTL_UNNUMBERED,
 884                 .procname       = "oom_kill_allocating_task",
 885                 .data           = &sysctl_oom_kill_allocating_task,
 886                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
 887                 .mode           = 0644,
 888                 .proc_handler   = &proc_dointvec,
 889         },
 890         {
 891                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 892                 .procname       = "overcommit_ratio",
 893                 .data           = &sysctl_overcommit_ratio,
 894                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 895                 .mode           = 0644,
 896                 .proc_handler   = &proc_dointvec,
 897         },
 898         {
 899                 .ctl_name       = VM_PAGE_CLUSTER,
 900                 .procname       = "page-cluster",
 901                 .data           = &page_cluster,
 902                 .maxlen         = sizeof(int),
 903                 .mode           = 0644,
 904                 .proc_handler   = &proc_dointvec,
 905         },
 906         {
 907                 .ctl_name       = VM_DIRTY_BACKGROUND,
 908                 .procname       = "dirty_background_ratio",
 909                 .data           = &dirty_background_ratio,
 910                 .maxlen         = sizeof(dirty_background_ratio),
 911                 .mode           = 0644,
 912                 .proc_handler   = &proc_dointvec_minmax,
 913                 .strategy       = &sysctl_intvec,
 914                 .extra1         = &zero,
 915                 .extra2         = &one_hundred,
 916         },
 917         {
 918                 .ctl_name       = VM_DIRTY_RATIO,
 919                 .procname       = "dirty_ratio",
 920                 .data           = &vm_dirty_ratio,
 921                 .maxlen         = sizeof(vm_dirty_ratio),
 922                 .mode           = 0644,
 923                 .proc_handler   = &dirty_ratio_handler,
 924                 .strategy       = &sysctl_intvec,
 925                 .extra1         = &zero,
 926                 .extra2         = &one_hundred,
 927         },
 928         {
 929                 .procname       = "dirty_writeback_centisecs",
 930                 .data           = &dirty_writeback_interval,
 931                 .maxlen         = sizeof(dirty_writeback_interval),
 932                 .mode           = 0644,
 933                 .proc_handler   = &dirty_writeback_centisecs_handler,
 934         },
 935         {
 936                 .procname       = "dirty_expire_centisecs",
 937                 .data           = &dirty_expire_interval,
 938                 .maxlen         = sizeof(dirty_expire_interval),
 939                 .mode           = 0644,
 940                 .proc_handler   = &proc_dointvec_userhz_jiffies,
 941         },
 942         {
 943                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 944                 .procname       = "nr_pdflush_threads",
 945                 .data           = &nr_pdflush_threads,
 946                 .maxlen         = sizeof nr_pdflush_threads,
 947                 .mode           = 0444 /* read-only*/,
 948                 .proc_handler   = &proc_dointvec,
 949         },
 950         {
 951                 .ctl_name       = VM_SWAPPINESS,
 952                 .procname       = "swappiness",
 953                 .data           = &vm_swappiness,
 954                 .maxlen         = sizeof(vm_swappiness),
 955                 .mode           = 0644,
 956                 .proc_handler   = &proc_dointvec_minmax,
 957                 .strategy       = &sysctl_intvec,
 958                 .extra1         = &zero,
 959                 .extra2         = &one_hundred,
 960         },
 961 #ifdef CONFIG_HUGETLB_PAGE
 962          {
 963                 .procname       = "nr_hugepages",
 964                 .data           = &max_huge_pages,
 965                 .maxlen         = sizeof(unsigned long),
 966                 .mode           = 0644,
 967                 .proc_handler   = &hugetlb_sysctl_handler,
 968                 .extra1         = (void *)&hugetlb_zero,
 969                 .extra2         = (void *)&hugetlb_infinity,
 970          },
 971          {
 972                 .ctl_name       = VM_HUGETLB_GROUP,
 973                 .procname       = "hugetlb_shm_group",
 974                 .data           = &sysctl_hugetlb_shm_group,
 975                 .maxlen         = sizeof(gid_t),
 976                 .mode           = 0644,
 977                 .proc_handler   = &proc_dointvec,
 978          },
 979          {
 980                 .ctl_name       = CTL_UNNUMBERED,
 981                 .procname       = "hugepages_treat_as_movable",
 982                 .data           = &hugepages_treat_as_movable,
 983                 .maxlen         = sizeof(int),
 984                 .mode           = 0644,
 985                 .proc_handler   = &hugetlb_treat_movable_handler,
 986         },
 987         {
 988                 .ctl_name       = CTL_UNNUMBERED,
 989                 .procname       = "nr_overcommit_hugepages",
 990                 .data           = &nr_overcommit_huge_pages,
 991                 .maxlen         = sizeof(nr_overcommit_huge_pages),
 992                 .mode           = 0644,
 993                 .proc_handler   = &proc_doulongvec_minmax,
 994         },
 995 #endif
 996         {
 997                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
 998                 .procname       = "lowmem_reserve_ratio",
 999                 .data           = &sysctl_lowmem_reserve_ratio,
1000                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1001                 .mode           = 0644,
1002                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1003                 .strategy       = &sysctl_intvec,
1004         },
1005         {
1006                 .ctl_name       = VM_DROP_PAGECACHE,
1007                 .procname       = "drop_caches",
1008                 .data           = &sysctl_drop_caches,
1009                 .maxlen         = sizeof(int),
1010                 .mode           = 0644,
1011                 .proc_handler   = drop_caches_sysctl_handler,
1012                 .strategy       = &sysctl_intvec,
1013         },
1014         {
1015                 .ctl_name       = VM_MIN_FREE_KBYTES,
1016                 .procname       = "min_free_kbytes",
1017                 .data           = &min_free_kbytes,
1018                 .maxlen         = sizeof(min_free_kbytes),
1019                 .mode           = 0644,
1020                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1021                 .strategy       = &sysctl_intvec,
1022                 .extra1         = &zero,
1023         },
1024         {
1025                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1026                 .procname       = "percpu_pagelist_fraction",
1027                 .data           = &percpu_pagelist_fraction,
1028                 .maxlen         = sizeof(percpu_pagelist_fraction),
1029                 .mode           = 0644,
1030                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1031                 .strategy       = &sysctl_intvec,
1032                 .extra1         = &min_percpu_pagelist_fract,
1033         },
1034 #ifdef CONFIG_MMU
1035         {
1036                 .ctl_name       = VM_MAX_MAP_COUNT,
1037                 .procname       = "max_map_count",
1038                 .data           = &sysctl_max_map_count,
1039                 .maxlen         = sizeof(sysctl_max_map_count),
1040                 .mode           = 0644,
1041                 .proc_handler   = &proc_dointvec
1042         },
1043 #endif
1044         {
1045                 .ctl_name       = VM_LAPTOP_MODE,
1046                 .procname       = "laptop_mode",
1047                 .data           = &laptop_mode,
1048                 .maxlen         = sizeof(laptop_mode),
1049                 .mode           = 0644,
1050                 .proc_handler   = &proc_dointvec_jiffies,
1051                 .strategy       = &sysctl_jiffies,
1052         },
1053         {
1054                 .ctl_name       = VM_BLOCK_DUMP,
1055                 .procname       = "block_dump",
1056                 .data           = &block_dump,
1057                 .maxlen         = sizeof(block_dump),
1058                 .mode           = 0644,
1059                 .proc_handler   = &proc_dointvec,
1060                 .strategy       = &sysctl_intvec,
1061                 .extra1         = &zero,
1062         },
1063         {
1064                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1065                 .procname       = "vfs_cache_pressure",
1066                 .data           = &sysctl_vfs_cache_pressure,
1067                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1068                 .mode           = 0644,
1069                 .proc_handler   = &proc_dointvec,
1070                 .strategy       = &sysctl_intvec,
1071                 .extra1         = &zero,
1072         },
1073 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1074         {
1075                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1076                 .procname       = "legacy_va_layout",
1077                 .data           = &sysctl_legacy_va_layout,
1078                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1079                 .mode           = 0644,
1080                 .proc_handler   = &proc_dointvec,
1081                 .strategy       = &sysctl_intvec,
1082                 .extra1         = &zero,
1083         },
1084 #endif
1085 #ifdef CONFIG_NUMA
1086         {
1087                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1088                 .procname       = "zone_reclaim_mode",
1089                 .data           = &zone_reclaim_mode,
1090                 .maxlen         = sizeof(zone_reclaim_mode),
1091                 .mode           = 0644,
1092                 .proc_handler   = &proc_dointvec,
1093                 .strategy       = &sysctl_intvec,
1094                 .extra1         = &zero,
1095         },
1096         {
1097                 .ctl_name       = VM_MIN_UNMAPPED,
1098                 .procname       = "min_unmapped_ratio",
1099                 .data           = &sysctl_min_unmapped_ratio,
1100                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1101                 .mode           = 0644,
1102                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1103                 .strategy       = &sysctl_intvec,
1104                 .extra1         = &zero,
1105                 .extra2         = &one_hundred,
1106         },
1107         {
1108                 .ctl_name       = VM_MIN_SLAB,
1109                 .procname       = "min_slab_ratio",
1110                 .data           = &sysctl_min_slab_ratio,
1111                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1112                 .mode           = 0644,
1113                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1114                 .strategy       = &sysctl_intvec,
1115                 .extra1         = &zero,
1116                 .extra2         = &one_hundred,
1117         },
1118 #endif
1119 #ifdef CONFIG_SMP
1120         {
1121                 .ctl_name       = CTL_UNNUMBERED,
1122                 .procname       = "stat_interval",
1123                 .data           = &sysctl_stat_interval,
1124                 .maxlen         = sizeof(sysctl_stat_interval),
1125                 .mode           = 0644,
1126                 .proc_handler   = &proc_dointvec_jiffies,
1127                 .strategy       = &sysctl_jiffies,
1128         },
1129 #endif
1130 #ifdef CONFIG_SECURITY
1131         {
1132                 .ctl_name       = CTL_UNNUMBERED,
1133                 .procname       = "mmap_min_addr",
1134                 .data           = &mmap_min_addr,
1135                 .maxlen         = sizeof(unsigned long),
1136                 .mode           = 0644,
1137                 .proc_handler   = &proc_doulongvec_minmax,
1138         },
1139 #endif
1140 #ifdef CONFIG_NUMA
1141         {
1142                 .ctl_name       = CTL_UNNUMBERED,
1143                 .procname       = "numa_zonelist_order",
1144                 .data           = &numa_zonelist_order,
1145                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1146                 .mode           = 0644,
1147                 .proc_handler   = &numa_zonelist_order_handler,
1148                 .strategy       = &sysctl_string,
1149         },
1150 #endif
1151 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1152    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1153         {
1154                 .ctl_name       = VM_VDSO_ENABLED,
1155                 .procname       = "vdso_enabled",
1156                 .data           = &vdso_enabled,
1157                 .maxlen         = sizeof(vdso_enabled),
1158                 .mode           = 0644,
1159                 .proc_handler   = &proc_dointvec,
1160                 .strategy       = &sysctl_intvec,
1161                 .extra1         = &zero,
1162         },
1163 #endif
1164 /*
1165  * NOTE: do not add new entries to this table unless you have read
1166  * Documentation/sysctl/ctl_unnumbered.txt
1167  */
1168         { .ctl_name = 0 }
1169 };
1170
1171 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1172 static struct ctl_table binfmt_misc_table[] = {
1173         { .ctl_name = 0 }
1174 };
1175 #endif
1176
1177 static struct ctl_table fs_table[] = {
1178         {
1179                 .ctl_name       = FS_NRINODE,
1180                 .procname       = "inode-nr",
1181                 .data           = &inodes_stat,
1182                 .maxlen         = 2*sizeof(int),
1183                 .mode           = 0444,
1184                 .proc_handler   = &proc_dointvec,
1185         },
1186         {
1187                 .ctl_name       = FS_STATINODE,
1188                 .procname       = "inode-state",
1189                 .data           = &inodes_stat,
1190                 .maxlen         = 7*sizeof(int),
1191                 .mode           = 0444,
1192                 .proc_handler   = &proc_dointvec,
1193         },
1194         {
1195                 .procname       = "file-nr",
1196                 .data           = &files_stat,
1197                 .maxlen         = 3*sizeof(int),
1198                 .mode           = 0444,
1199                 .proc_handler   = &proc_nr_files,
1200         },
1201         {
1202                 .ctl_name       = FS_MAXFILE,
1203                 .procname       = "file-max",
1204                 .data           = &files_stat.max_files,
1205                 .maxlen         = sizeof(int),
1206                 .mode           = 0644,
1207                 .proc_handler   = &proc_dointvec,
1208         },
1209         {
1210                 .ctl_name       = FS_DENTRY,
1211                 .procname       = "dentry-state",
1212                 .data           = &dentry_stat,
1213                 .maxlen         = 6*sizeof(int),
1214                 .mode           = 0444,
1215                 .proc_handler   = &proc_dointvec,
1216         },
1217         {
1218                 .ctl_name       = FS_OVERFLOWUID,
1219                 .procname       = "overflowuid",
1220                 .data           = &fs_overflowuid,
1221                 .maxlen         = sizeof(int),
1222                 .mode           = 0644,
1223                 .proc_handler   = &proc_dointvec_minmax,
1224                 .strategy       = &sysctl_intvec,
1225                 .extra1         = &minolduid,
1226                 .extra2         = &maxolduid,
1227         },
1228         {
1229                 .ctl_name       = FS_OVERFLOWGID,
1230                 .procname       = "overflowgid",
1231                 .data           = &fs_overflowgid,
1232                 .maxlen         = sizeof(int),
1233                 .mode           = 0644,
1234                 .proc_handler   = &proc_dointvec_minmax,
1235                 .strategy       = &sysctl_intvec,
1236                 .extra1         = &minolduid,
1237                 .extra2         = &maxolduid,
1238         },
1239         {
1240                 .ctl_name       = FS_LEASES,
1241                 .procname       = "leases-enable",
1242                 .data           = &leases_enable,
1243                 .maxlen         = sizeof(int),
1244                 .mode           = 0644,
1245                 .proc_handler   = &proc_dointvec,
1246         },
1247 #ifdef CONFIG_DNOTIFY
1248         {
1249                 .ctl_name       = FS_DIR_NOTIFY,
1250                 .procname       = "dir-notify-enable",
1251                 .data           = &dir_notify_enable,
1252                 .maxlen         = sizeof(int),
1253                 .mode           = 0644,
1254                 .proc_handler   = &proc_dointvec,
1255         },
1256 #endif
1257 #ifdef CONFIG_MMU
1258         {
1259                 .ctl_name       = FS_LEASE_TIME,
1260                 .procname       = "lease-break-time",
1261                 .data           = &lease_break_time,
1262                 .maxlen         = sizeof(int),
1263                 .mode           = 0644,
1264                 .proc_handler   = &proc_dointvec_minmax,
1265                 .strategy       = &sysctl_intvec,
1266                 .extra1         = &zero,
1267                 .extra2         = &two,
1268         },
1269         {
1270                 .procname       = "aio-nr",
1271                 .data           = &aio_nr,
1272                 .maxlen         = sizeof(aio_nr),
1273                 .mode           = 0444,
1274                 .proc_handler   = &proc_doulongvec_minmax,
1275         },
1276         {
1277                 .procname       = "aio-max-nr",
1278                 .data           = &aio_max_nr,
1279                 .maxlen         = sizeof(aio_max_nr),
1280                 .mode           = 0644,
1281                 .proc_handler   = &proc_doulongvec_minmax,
1282         },
1283 #ifdef CONFIG_INOTIFY_USER
1284         {
1285                 .ctl_name       = FS_INOTIFY,
1286                 .procname       = "inotify",
1287                 .mode           = 0555,
1288                 .child          = inotify_table,
1289         },
1290 #endif
1291 #endif
1292         {
1293                 .ctl_name       = KERN_SETUID_DUMPABLE,
1294                 .procname       = "suid_dumpable",
1295                 .data           = &suid_dumpable,
1296                 .maxlen         = sizeof(int),
1297                 .mode           = 0644,
1298                 .proc_handler   = &proc_dointvec,
1299         },
1300 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1301         {
1302                 .ctl_name       = CTL_UNNUMBERED,
1303                 .procname       = "binfmt_misc",
1304                 .mode           = 0555,
1305                 .child          = binfmt_misc_table,
1306         },
1307 #endif
1308 /*
1309  * NOTE: do not add new entries to this table unless you have read
1310  * Documentation/sysctl/ctl_unnumbered.txt
1311  */
1312         { .ctl_name = 0 }
1313 };
1314
1315 static struct ctl_table debug_table[] = {
1316 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1317         {
1318                 .ctl_name       = CTL_UNNUMBERED,
1319                 .procname       = "exception-trace",
1320                 .data           = &show_unhandled_signals,
1321                 .maxlen         = sizeof(int),
1322                 .mode           = 0644,
1323                 .proc_handler   = proc_dointvec
1324         },
1325 #endif
1326         { .ctl_name = 0 }
1327 };
1328
1329 static struct ctl_table dev_table[] = {
1330         { .ctl_name = 0 }
1331 };
1332
1333 static DEFINE_SPINLOCK(sysctl_lock);
1334
1335 /* called under sysctl_lock */
1336 static int use_table(struct ctl_table_header *p)
1337 {
1338         if (unlikely(p->unregistering))
1339                 return 0;
1340         p->used++;
1341         return 1;
1342 }
1343
1344 /* called under sysctl_lock */
1345 static void unuse_table(struct ctl_table_header *p)
1346 {
1347         if (!--p->used)
1348                 if (unlikely(p->unregistering))
1349                         complete(p->unregistering);
1350 }
1351
1352 /* called under sysctl_lock, will reacquire if has to wait */
1353 static void start_unregistering(struct ctl_table_header *p)
1354 {
1355         /*
1356          * if p->used is 0, nobody will ever touch that entry again;
1357          * we'll eliminate all paths to it before dropping sysctl_lock
1358          */
1359         if (unlikely(p->used)) {
1360                 struct completion wait;
1361                 init_completion(&wait);
1362                 p->unregistering = &wait;
1363                 spin_unlock(&sysctl_lock);
1364                 wait_for_completion(&wait);
1365                 spin_lock(&sysctl_lock);
1366         }
1367         /*
1368          * do not remove from the list until nobody holds it; walking the
1369          * list in do_sysctl() relies on that.
1370          */
1371         list_del_init(&p->ctl_entry);
1372 }
1373
1374 void sysctl_head_finish(struct ctl_table_header *head)
1375 {
1376         if (!head)
1377                 return;
1378         spin_lock(&sysctl_lock);
1379         unuse_table(head);
1380         spin_unlock(&sysctl_lock);
1381 }
1382
1383 static struct list_head *
1384 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1385 {
1386         struct list_head *header_list;
1387         header_list = &root->header_list;
1388         if (root->lookup)
1389                 header_list = root->lookup(root, namespaces);
1390         return header_list;
1391 }
1392
1393 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1394                                             struct ctl_table_header *prev)
1395 {
1396         struct ctl_table_root *root;
1397         struct list_head *header_list;
1398         struct ctl_table_header *head;
1399         struct list_head *tmp;
1400
1401         spin_lock(&sysctl_lock);
1402         if (prev) {
1403                 head = prev;
1404                 tmp = &prev->ctl_entry;
1405                 unuse_table(prev);
1406                 goto next;
1407         }
1408         tmp = &root_table_header.ctl_entry;
1409         for (;;) {
1410                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1411
1412                 if (!use_table(head))
1413                         goto next;
1414                 spin_unlock(&sysctl_lock);
1415                 return head;
1416         next:
1417                 root = head->root;
1418                 tmp = tmp->next;
1419                 header_list = lookup_header_list(root, namespaces);
1420                 if (tmp != header_list)
1421                         continue;
1422
1423                 do {
1424                         root = list_entry(root->root_list.next,
1425                                         struct ctl_table_root, root_list);
1426                         if (root == &sysctl_table_root)
1427                                 goto out;
1428                         header_list = lookup_header_list(root, namespaces);
1429                 } while (list_empty(header_list));
1430                 tmp = header_list->next;
1431         }
1432 out:
1433         spin_unlock(&sysctl_lock);
1434         return NULL;
1435 }
1436
1437 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1438 {
1439         return __sysctl_head_next(current->nsproxy, prev);
1440 }
1441
1442 void register_sysctl_root(struct ctl_table_root *root)
1443 {
1444         spin_lock(&sysctl_lock);
1445         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1446         spin_unlock(&sysctl_lock);
1447 }
1448
1449 #ifdef CONFIG_SYSCTL_SYSCALL
1450 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1451                void __user *newval, size_t newlen)
1452 {
1453         struct ctl_table_header *head;
1454         int error = -ENOTDIR;
1455
1456         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1457                 return -ENOTDIR;
1458         if (oldval) {
1459                 int old_len;
1460                 if (!oldlenp || get_user(old_len, oldlenp))
1461                         return -EFAULT;
1462         }
1463
1464         for (head = sysctl_head_next(NULL); head;
1465                         head = sysctl_head_next(head)) {
1466                 error = parse_table(name, nlen, oldval, oldlenp,
1467                                         newval, newlen, head->ctl_table);
1468                 if (error != -ENOTDIR) {
1469                         sysctl_head_finish(head);
1470                         break;
1471                 }
1472         }
1473         return error;
1474 }
1475
1476 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1477 {
1478         struct __sysctl_args tmp;
1479         int error;
1480
1481         if (copy_from_user(&tmp, args, sizeof(tmp)))
1482                 return -EFAULT;
1483
1484         error = deprecated_sysctl_warning(&tmp);
1485         if (error)
1486                 goto out;
1487
1488         lock_kernel();
1489         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1490                           tmp.newval, tmp.newlen);
1491         unlock_kernel();
1492 out:
1493         return error;
1494 }
1495 #endif /* CONFIG_SYSCTL_SYSCALL */
1496
1497 /*
1498  * sysctl_perm does NOT grant the superuser all rights automatically, because
1499  * some sysctl variables are readonly even to root.
1500  */
1501
1502 static int test_perm(int mode, int op)
1503 {
1504         if (!current->euid)
1505                 mode >>= 6;
1506         else if (in_egroup_p(0))
1507                 mode >>= 3;
1508         if ((mode & op & 0007) == op)
1509                 return 0;
1510         return -EACCES;
1511 }
1512
1513 int sysctl_perm(struct ctl_table *table, int op)
1514 {
1515         int error;
1516         error = security_sysctl(table, op);
1517         if (error)
1518                 return error;
1519         return test_perm(table->mode, op);
1520 }
1521
1522 #ifdef CONFIG_SYSCTL_SYSCALL
1523 static int parse_table(int __user *name, int nlen,
1524                        void __user *oldval, size_t __user *oldlenp,
1525                        void __user *newval, size_t newlen,
1526                        struct ctl_table *table)
1527 {
1528         int n;
1529 repeat:
1530         if (!nlen)
1531                 return -ENOTDIR;
1532         if (get_user(n, name))
1533                 return -EFAULT;
1534         for ( ; table->ctl_name || table->procname; table++) {
1535                 if (!table->ctl_name)
1536                         continue;
1537                 if (n == table->ctl_name) {
1538                         int error;
1539                         if (table->child) {
1540                                 if (sysctl_perm(table, 001))
1541                                         return -EPERM;
1542                                 name++;
1543                                 nlen--;
1544                                 table = table->child;
1545                                 goto repeat;
1546                         }
1547                         error = do_sysctl_strategy(table, name, nlen,
1548                                                    oldval, oldlenp,
1549                                                    newval, newlen);
1550                         return error;
1551                 }
1552         }
1553         return -ENOTDIR;
1554 }
1555
1556 /* Perform the actual read/write of a sysctl table entry. */
1557 int do_sysctl_strategy (struct ctl_table *table,
1558                         int __user *name, int nlen,
1559                         void __user *oldval, size_t __user *oldlenp,
1560                         void __user *newval, size_t newlen)
1561 {
1562         int op = 0, rc;
1563
1564         if (oldval)
1565                 op |= 004;
1566         if (newval)
1567                 op |= 002;
1568         if (sysctl_perm(table, op))
1569                 return -EPERM;
1570
1571         if (table->strategy) {
1572                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1573                                      newval, newlen);
1574                 if (rc < 0)
1575                         return rc;
1576                 if (rc > 0)
1577                         return 0;
1578         }
1579
1580         /* If there is no strategy routine, or if the strategy returns
1581          * zero, proceed with automatic r/w */
1582         if (table->data && table->maxlen) {
1583                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1584                                  newval, newlen);
1585                 if (rc < 0)
1586                         return rc;
1587         }
1588         return 0;
1589 }
1590 #endif /* CONFIG_SYSCTL_SYSCALL */
1591
1592 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1593 {
1594         for (; table->ctl_name || table->procname; table++) {
1595                 table->parent = parent;
1596                 if (table->child)
1597                         sysctl_set_parent(table, table->child);
1598         }
1599 }
1600
1601 static __init int sysctl_init(void)
1602 {
1603         int err;
1604         sysctl_set_parent(NULL, root_table);
1605         err = sysctl_check_table(current->nsproxy, root_table);
1606         return 0;
1607 }
1608
1609 core_initcall(sysctl_init);
1610
1611 /**
1612  * __register_sysctl_paths - register a sysctl hierarchy
1613  * @root: List of sysctl headers to register on
1614  * @namespaces: Data to compute which lists of sysctl entries are visible
1615  * @path: The path to the directory the sysctl table is in.
1616  * @table: the top-level table structure
1617  *
1618  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1619  * array. A completely 0 filled entry terminates the table.
1620  *
1621  * The members of the &struct ctl_table structure are used as follows:
1622  *
1623  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1624  *            must be unique within that level of sysctl
1625  *
1626  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1627  *            enter a sysctl file
1628  *
1629  * data - a pointer to data for use by proc_handler
1630  *
1631  * maxlen - the maximum size in bytes of the data
1632  *
1633  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1634  *
1635  * child - a pointer to the child sysctl table if this entry is a directory, or
1636  *         %NULL.
1637  *
1638  * proc_handler - the text handler routine (described below)
1639  *
1640  * strategy - the strategy routine (described below)
1641  *
1642  * de - for internal use by the sysctl routines
1643  *
1644  * extra1, extra2 - extra pointers usable by the proc handler routines
1645  *
1646  * Leaf nodes in the sysctl tree will be represented by a single file
1647  * under /proc; non-leaf nodes will be represented by directories.
1648  *
1649  * sysctl(2) can automatically manage read and write requests through
1650  * the sysctl table.  The data and maxlen fields of the ctl_table
1651  * struct enable minimal validation of the values being written to be
1652  * performed, and the mode field allows minimal authentication.
1653  *
1654  * More sophisticated management can be enabled by the provision of a
1655  * strategy routine with the table entry.  This will be called before
1656  * any automatic read or write of the data is performed.
1657  *
1658  * The strategy routine may return
1659  *
1660  * < 0 - Error occurred (error is passed to user process)
1661  *
1662  * 0   - OK - proceed with automatic read or write.
1663  *
1664  * > 0 - OK - read or write has been done by the strategy routine, so
1665  *       return immediately.
1666  *
1667  * There must be a proc_handler routine for any terminal nodes
1668  * mirrored under /proc/sys (non-terminals are handled by a built-in
1669  * directory handler).  Several default handlers are available to
1670  * cover common cases -
1671  *
1672  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1673  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1674  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1675  *
1676  * It is the handler's job to read the input buffer from user memory
1677  * and process it. The handler should return 0 on success.
1678  *
1679  * This routine returns %NULL on a failure to register, and a pointer
1680  * to the table header on success.
1681  */
1682 struct ctl_table_header *__register_sysctl_paths(
1683         struct ctl_table_root *root,
1684         struct nsproxy *namespaces,
1685         const struct ctl_path *path, struct ctl_table *table)
1686 {
1687         struct list_head *header_list;
1688         struct ctl_table_header *header;
1689         struct ctl_table *new, **prevp;
1690         unsigned int n, npath;
1691
1692         /* Count the path components */
1693         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1694                 ;
1695
1696         /*
1697          * For each path component, allocate a 2-element ctl_table array.
1698          * The first array element will be filled with the sysctl entry
1699          * for this, the second will be the sentinel (ctl_name == 0).
1700          *
1701          * We allocate everything in one go so that we don't have to
1702          * worry about freeing additional memory in unregister_sysctl_table.
1703          */
1704         header = kzalloc(sizeof(struct ctl_table_header) +
1705                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1706         if (!header)
1707                 return NULL;
1708
1709         new = (struct ctl_table *) (header + 1);
1710
1711         /* Now connect the dots */
1712         prevp = &header->ctl_table;
1713         for (n = 0; n < npath; ++n, ++path) {
1714                 /* Copy the procname */
1715                 new->procname = path->procname;
1716                 new->ctl_name = path->ctl_name;
1717                 new->mode     = 0555;
1718
1719                 *prevp = new;
1720                 prevp = &new->child;
1721
1722                 new += 2;
1723         }
1724         *prevp = table;
1725         header->ctl_table_arg = table;
1726
1727         INIT_LIST_HEAD(&header->ctl_entry);
1728         header->used = 0;
1729         header->unregistering = NULL;
1730         header->root = root;
1731         sysctl_set_parent(NULL, header->ctl_table);
1732         if (sysctl_check_table(namespaces, header->ctl_table)) {
1733                 kfree(header);
1734                 return NULL;
1735         }
1736         spin_lock(&sysctl_lock);
1737         header_list = lookup_header_list(root, namespaces);
1738         list_add_tail(&header->ctl_entry, header_list);
1739         spin_unlock(&sysctl_lock);
1740
1741         return header;
1742 }
1743
1744 /**
1745  * register_sysctl_table_path - register a sysctl table hierarchy
1746  * @path: The path to the directory the sysctl table is in.
1747  * @table: the top-level table structure
1748  *
1749  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1750  * array. A completely 0 filled entry terminates the table.
1751  *
1752  * See __register_sysctl_paths for more details.
1753  */
1754 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1755                                                 struct ctl_table *table)
1756 {
1757         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1758                                         path, table);
1759 }
1760
1761 /**
1762  * register_sysctl_table - register a sysctl table hierarchy
1763  * @table: the top-level table structure
1764  *
1765  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1766  * array. A completely 0 filled entry terminates the table.
1767  *
1768  * See register_sysctl_paths for more details.
1769  */
1770 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1771 {
1772         static const struct ctl_path null_path[] = { {} };
1773
1774         return register_sysctl_paths(null_path, table);
1775 }
1776
1777 /**
1778  * unregister_sysctl_table - unregister a sysctl table hierarchy
1779  * @header: the header returned from register_sysctl_table
1780  *
1781  * Unregisters the sysctl table and all children. proc entries may not
1782  * actually be removed until they are no longer used by anyone.
1783  */
1784 void unregister_sysctl_table(struct ctl_table_header * header)
1785 {
1786         might_sleep();
1787
1788         if (header == NULL)
1789                 return;
1790
1791         spin_lock(&sysctl_lock);
1792         start_unregistering(header);
1793         spin_unlock(&sysctl_lock);
1794         kfree(header);
1795 }
1796
1797 #else /* !CONFIG_SYSCTL */
1798 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1799 {
1800         return NULL;
1801 }
1802
1803 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1804                                                     struct ctl_table *table)
1805 {
1806         return NULL;
1807 }
1808
1809 void unregister_sysctl_table(struct ctl_table_header * table)
1810 {
1811 }
1812
1813 #endif /* CONFIG_SYSCTL */
1814
1815 /*
1816  * /proc/sys support
1817  */
1818
1819 #ifdef CONFIG_PROC_SYSCTL
1820
1821 static int _proc_do_string(void* data, int maxlen, int write,
1822                            struct file *filp, void __user *buffer,
1823                            size_t *lenp, loff_t *ppos)
1824 {
1825         size_t len;
1826         char __user *p;
1827         char c;
1828
1829         if (!data || !maxlen || !*lenp) {
1830                 *lenp = 0;
1831                 return 0;
1832         }
1833
1834         if (write) {
1835                 len = 0;
1836                 p = buffer;
1837                 while (len < *lenp) {
1838                         if (get_user(c, p++))
1839                                 return -EFAULT;
1840                         if (c == 0 || c == '\n')
1841                                 break;
1842                         len++;
1843                 }
1844                 if (len >= maxlen)
1845                         len = maxlen-1;
1846                 if(copy_from_user(data, buffer, len))
1847                         return -EFAULT;
1848                 ((char *) data)[len] = 0;
1849                 *ppos += *lenp;
1850         } else {
1851                 len = strlen(data);
1852                 if (len > maxlen)
1853                         len = maxlen;
1854
1855                 if (*ppos > len) {
1856                         *lenp = 0;
1857                         return 0;
1858                 }
1859
1860                 data += *ppos;
1861                 len  -= *ppos;
1862
1863                 if (len > *lenp)
1864                         len = *lenp;
1865                 if (len)
1866                         if(copy_to_user(buffer, data, len))
1867                                 return -EFAULT;
1868                 if (len < *lenp) {
1869                         if(put_user('\n', ((char __user *) buffer) + len))
1870                                 return -EFAULT;
1871                         len++;
1872                 }
1873                 *lenp = len;
1874                 *ppos += len;
1875         }
1876         return 0;
1877 }
1878
1879 /**
1880  * proc_dostring - read a string sysctl
1881  * @table: the sysctl table
1882  * @write: %TRUE if this is a write to the sysctl file
1883  * @filp: the file structure
1884  * @buffer: the user buffer
1885  * @lenp: the size of the user buffer
1886  * @ppos: file position
1887  *
1888  * Reads/writes a string from/to the user buffer. If the kernel
1889  * buffer provided is not large enough to hold the string, the
1890  * string is truncated. The copied string is %NULL-terminated.
1891  * If the string is being read by the user process, it is copied
1892  * and a newline '\n' is added. It is truncated if the buffer is
1893  * not large enough.
1894  *
1895  * Returns 0 on success.
1896  */
1897 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1898                   void __user *buffer, size_t *lenp, loff_t *ppos)
1899 {
1900         return _proc_do_string(table->data, table->maxlen, write, filp,
1901                                buffer, lenp, ppos);
1902 }
1903
1904
1905 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1906                                  int *valp,
1907                                  int write, void *data)
1908 {
1909         if (write) {
1910                 *valp = *negp ? -*lvalp : *lvalp;
1911         } else {
1912                 int val = *valp;
1913                 if (val < 0) {
1914                         *negp = -1;
1915                         *lvalp = (unsigned long)-val;
1916                 } else {
1917                         *negp = 0;
1918                         *lvalp = (unsigned long)val;
1919                 }
1920         }
1921         return 0;
1922 }
1923
1924 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1925                   int write, struct file *filp, void __user *buffer,
1926                   size_t *lenp, loff_t *ppos,
1927                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1928                               int write, void *data),
1929                   void *data)
1930 {
1931 #define TMPBUFLEN 21
1932         int *i, vleft, first=1, neg, val;
1933         unsigned long lval;
1934         size_t left, len;
1935
1936         char buf[TMPBUFLEN], *p;
1937         char __user *s = buffer;
1938
1939         if (!tbl_data || !table->maxlen || !*lenp ||
1940             (*ppos && !write)) {
1941                 *lenp = 0;
1942                 return 0;
1943         }
1944
1945         i = (int *) tbl_data;
1946         vleft = table->maxlen / sizeof(*i);
1947         left = *lenp;
1948
1949         if (!conv)
1950                 conv = do_proc_dointvec_conv;
1951
1952         for (; left && vleft--; i++, first=0) {
1953                 if (write) {
1954                         while (left) {
1955                                 char c;
1956                                 if (get_user(c, s))
1957                                         return -EFAULT;
1958                                 if (!isspace(c))
1959                                         break;
1960                                 left--;
1961                                 s++;
1962                         }
1963                         if (!left)
1964                                 break;
1965                         neg = 0;
1966                         len = left;
1967                         if (len > sizeof(buf) - 1)
1968                                 len = sizeof(buf) - 1;
1969                         if (copy_from_user(buf, s, len))
1970                                 return -EFAULT;
1971                         buf[len] = 0;
1972                         p = buf;
1973                         if (*p == '-' && left > 1) {
1974                                 neg = 1;
1975                                 p++;
1976                         }
1977                         if (*p < '0' || *p > '9')
1978                                 break;
1979
1980                         lval = simple_strtoul(p, &p, 0);
1981
1982                         len = p-buf;
1983                         if ((len < left) && *p && !isspace(*p))
1984                                 break;
1985                         if (neg)
1986                                 val = -val;
1987                         s += len;
1988                         left -= len;
1989
1990                         if (conv(&neg, &lval, i, 1, data))
1991                                 break;
1992                 } else {
1993                         p = buf;
1994                         if (!first)
1995                                 *p++ = '\t';
1996
1997                         if (conv(&neg, &lval, i, 0, data))
1998                                 break;
1999
2000                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2001                         len = strlen(buf);
2002                         if (len > left)
2003                                 len = left;
2004                         if(copy_to_user(s, buf, len))
2005                                 return -EFAULT;
2006                         left -= len;
2007                         s += len;
2008                 }
2009         }
2010
2011         if (!write && !first && left) {
2012                 if(put_user('\n', s))
2013                         return -EFAULT;
2014                 left--, s++;
2015         }
2016         if (write) {
2017                 while (left) {
2018                         char c;
2019                         if (get_user(c, s++))
2020                                 return -EFAULT;
2021                         if (!isspace(c))
2022                                 break;
2023                         left--;
2024                 }
2025         }
2026         if (write && first)
2027                 return -EINVAL;
2028         *lenp -= left;
2029         *ppos += *lenp;
2030         return 0;
2031 #undef TMPBUFLEN
2032 }
2033
2034 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2035                   void __user *buffer, size_t *lenp, loff_t *ppos,
2036                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2037                               int write, void *data),
2038                   void *data)
2039 {
2040         return __do_proc_dointvec(table->data, table, write, filp,
2041                         buffer, lenp, ppos, conv, data);
2042 }
2043
2044 /**
2045  * proc_dointvec - read a vector of integers
2046  * @table: the sysctl table
2047  * @write: %TRUE if this is a write to the sysctl file
2048  * @filp: the file structure
2049  * @buffer: the user buffer
2050  * @lenp: the size of the user buffer
2051  * @ppos: file position
2052  *
2053  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2054  * values from/to the user buffer, treated as an ASCII string.
2055  *
2056  * Returns 0 on success.
2057  */
2058 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2059                      void __user *buffer, size_t *lenp, loff_t *ppos)
2060 {
2061     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2062                             NULL,NULL);
2063 }
2064
2065 #define OP_SET  0
2066 #define OP_AND  1
2067 #define OP_OR   2
2068
2069 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2070                                       int *valp,
2071                                       int write, void *data)
2072 {
2073         int op = *(int *)data;
2074         if (write) {
2075                 int val = *negp ? -*lvalp : *lvalp;
2076                 switch(op) {
2077                 case OP_SET:    *valp = val; break;
2078                 case OP_AND:    *valp &= val; break;
2079                 case OP_OR:     *valp |= val; break;
2080                 }
2081         } else {
2082                 int val = *valp;
2083                 if (val < 0) {
2084                         *negp = -1;
2085                         *lvalp = (unsigned long)-val;
2086                 } else {
2087                         *negp = 0;
2088                         *lvalp = (unsigned long)val;
2089                 }
2090         }
2091         return 0;
2092 }
2093
2094 #ifdef CONFIG_SECURITY_CAPABILITIES
2095 /*
2096  *      init may raise the set.
2097  */
2098
2099 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2100                         void __user *buffer, size_t *lenp, loff_t *ppos)
2101 {
2102         int op;
2103
2104         if (write && !capable(CAP_SYS_MODULE)) {
2105                 return -EPERM;
2106         }
2107
2108         op = is_global_init(current) ? OP_SET : OP_AND;
2109         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2110                                 do_proc_dointvec_bset_conv,&op);
2111 }
2112 #endif /* def CONFIG_SECURITY_CAPABILITIES */
2113
2114 /*
2115  *      Taint values can only be increased
2116  */
2117 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2118                                void __user *buffer, size_t *lenp, loff_t *ppos)
2119 {
2120         int op;
2121
2122         if (write && !capable(CAP_SYS_ADMIN))
2123                 return -EPERM;
2124
2125         op = OP_OR;
2126         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2127                                 do_proc_dointvec_bset_conv,&op);
2128 }
2129
2130 struct do_proc_dointvec_minmax_conv_param {
2131         int *min;
2132         int *max;
2133 };
2134
2135 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2136                                         int *valp,
2137                                         int write, void *data)
2138 {
2139         struct do_proc_dointvec_minmax_conv_param *param = data;
2140         if (write) {
2141                 int val = *negp ? -*lvalp : *lvalp;
2142                 if ((param->min && *param->min > val) ||
2143                     (param->max && *param->max < val))
2144                         return -EINVAL;
2145                 *valp = val;
2146         } else {
2147                 int val = *valp;
2148                 if (val < 0) {
2149                         *negp = -1;
2150                         *lvalp = (unsigned long)-val;
2151                 } else {
2152                         *negp = 0;
2153                         *lvalp = (unsigned long)val;
2154                 }
2155         }
2156         return 0;
2157 }
2158
2159 /**
2160  * proc_dointvec_minmax - read a vector of integers with min/max values
2161  * @table: the sysctl table
2162  * @write: %TRUE if this is a write to the sysctl file
2163  * @filp: the file structure
2164  * @buffer: the user buffer
2165  * @lenp: the size of the user buffer
2166  * @ppos: file position
2167  *
2168  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2169  * values from/to the user buffer, treated as an ASCII string.
2170  *
2171  * This routine will ensure the values are within the range specified by
2172  * table->extra1 (min) and table->extra2 (max).
2173  *
2174  * Returns 0 on success.
2175  */
2176 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2177                   void __user *buffer, size_t *lenp, loff_t *ppos)
2178 {
2179         struct do_proc_dointvec_minmax_conv_param param = {
2180                 .min = (int *) table->extra1,
2181                 .max = (int *) table->extra2,
2182         };
2183         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2184                                 do_proc_dointvec_minmax_conv, &param);
2185 }
2186
2187 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2188                                      struct file *filp,
2189                                      void __user *buffer,
2190                                      size_t *lenp, loff_t *ppos,
2191                                      unsigned long convmul,
2192                                      unsigned long convdiv)
2193 {
2194 #define TMPBUFLEN 21
2195         unsigned long *i, *min, *max, val;
2196         int vleft, first=1, neg;
2197         size_t len, left;
2198         char buf[TMPBUFLEN], *p;
2199         char __user *s = buffer;
2200
2201         if (!data || !table->maxlen || !*lenp ||
2202             (*ppos && !write)) {
2203                 *lenp = 0;
2204                 return 0;
2205         }
2206
2207         i = (unsigned long *) data;
2208         min = (unsigned long *) table->extra1;
2209         max = (unsigned long *) table->extra2;
2210         vleft = table->maxlen / sizeof(unsigned long);
2211         left = *lenp;
2212
2213         for (; left && vleft--; i++, min++, max++, first=0) {
2214                 if (write) {
2215                         while (left) {
2216                                 char c;
2217                                 if (get_user(c, s))
2218                                         return -EFAULT;
2219                                 if (!isspace(c))
2220                                         break;
2221                                 left--;
2222                                 s++;
2223                         }
2224                         if (!left)
2225                                 break;
2226                         neg = 0;
2227                         len = left;
2228                         if (len > TMPBUFLEN-1)
2229                                 len = TMPBUFLEN-1;
2230                         if (copy_from_user(buf, s, len))
2231                                 return -EFAULT;
2232                         buf[len] = 0;
2233                         p = buf;
2234                         if (*p == '-' && left > 1) {
2235                                 neg = 1;
2236                                 p++;
2237                         }
2238                         if (*p < '0' || *p > '9')
2239                                 break;
2240                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2241                         len = p-buf;
2242                         if ((len < left) && *p && !isspace(*p))
2243                                 break;
2244                         if (neg)
2245                                 val = -val;
2246                         s += len;
2247                         left -= len;
2248
2249                         if(neg)
2250                                 continue;
2251                         if ((min && val < *min) || (max && val > *max))
2252                                 continue;
2253                         *i = val;
2254                 } else {
2255                         p = buf;
2256                         if (!first)
2257                                 *p++ = '\t';
2258                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2259                         len = strlen(buf);
2260                         if (len > left)
2261                                 len = left;
2262                         if(copy_to_user(s, buf, len))
2263                                 return -EFAULT;
2264                         left -= len;
2265                         s += len;
2266                 }
2267         }
2268
2269         if (!write && !first && left) {
2270                 if(put_user('\n', s))
2271                         return -EFAULT;
2272                 left--, s++;
2273         }
2274         if (write) {
2275                 while (left) {
2276                         char c;
2277                         if (get_user(c, s++))
2278                                 return -EFAULT;
2279                         if (!isspace(c))
2280                                 break;
2281                         left--;
2282                 }
2283         }
2284         if (write && first)
2285                 return -EINVAL;
2286         *lenp -= left;
2287         *ppos += *lenp;
2288         return 0;
2289 #undef TMPBUFLEN
2290 }
2291
2292 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2293                                      struct file *filp,
2294                                      void __user *buffer,
2295                                      size_t *lenp, loff_t *ppos,
2296                                      unsigned long convmul,
2297                                      unsigned long convdiv)
2298 {
2299         return __do_proc_doulongvec_minmax(table->data, table, write,
2300                         filp, buffer, lenp, ppos, convmul, convdiv);
2301 }
2302
2303 /**
2304  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2305  * @table: the sysctl table
2306  * @write: %TRUE if this is a write to the sysctl file
2307  * @filp: the file structure
2308  * @buffer: the user buffer
2309  * @lenp: the size of the user buffer
2310  * @ppos: file position
2311  *
2312  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2313  * values from/to the user buffer, treated as an ASCII string.
2314  *
2315  * This routine will ensure the values are within the range specified by
2316  * table->extra1 (min) and table->extra2 (max).
2317  *
2318  * Returns 0 on success.
2319  */
2320 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2321                            void __user *buffer, size_t *lenp, loff_t *ppos)
2322 {
2323     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2324 }
2325
2326 /**
2327  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2328  * @table: the sysctl table
2329  * @write: %TRUE if this is a write to the sysctl file
2330  * @filp: the file structure
2331  * @buffer: the user buffer
2332  * @lenp: the size of the user buffer
2333  * @ppos: file position
2334  *
2335  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2336  * values from/to the user buffer, treated as an ASCII string. The values
2337  * are treated as milliseconds, and converted to jiffies when they are stored.
2338  *
2339  * This routine will ensure the values are within the range specified by
2340  * table->extra1 (min) and table->extra2 (max).
2341  *
2342  * Returns 0 on success.
2343  */
2344 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2345                                       struct file *filp,
2346                                       void __user *buffer,
2347                                       size_t *lenp, loff_t *ppos)
2348 {
2349     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2350                                      lenp, ppos, HZ, 1000l);
2351 }
2352
2353
2354 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2355                                          int *valp,
2356                                          int write, void *data)
2357 {
2358         if (write) {
2359                 if (*lvalp > LONG_MAX / HZ)
2360                         return 1;
2361                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2362         } else {
2363                 int val = *valp;
2364                 unsigned long lval;
2365                 if (val < 0) {
2366                         *negp = -1;
2367                         lval = (unsigned long)-val;
2368                 } else {
2369                         *negp = 0;
2370                         lval = (unsigned long)val;
2371                 }
2372                 *lvalp = lval / HZ;
2373         }
2374         return 0;
2375 }
2376
2377 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2378                                                 int *valp,
2379                                                 int write, void *data)
2380 {
2381         if (write) {
2382                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2383                         return 1;
2384                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2385         } else {
2386                 int val = *valp;
2387                 unsigned long lval;
2388                 if (val < 0) {
2389                         *negp = -1;
2390                         lval = (unsigned long)-val;
2391                 } else {
2392                         *negp = 0;
2393                         lval = (unsigned long)val;
2394                 }
2395                 *lvalp = jiffies_to_clock_t(lval);
2396         }
2397         return 0;
2398 }
2399
2400 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2401                                             int *valp,
2402                                             int write, void *data)
2403 {
2404         if (write) {
2405                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2406         } else {
2407                 int val = *valp;
2408                 unsigned long lval;
2409                 if (val < 0) {
2410                         *negp = -1;
2411                         lval = (unsigned long)-val;
2412                 } else {
2413                         *negp = 0;
2414                         lval = (unsigned long)val;
2415                 }
2416                 *lvalp = jiffies_to_msecs(lval);
2417         }
2418         return 0;
2419 }
2420
2421 /**
2422  * proc_dointvec_jiffies - read a vector of integers as seconds
2423  * @table: the sysctl table
2424  * @write: %TRUE if this is a write to the sysctl file
2425  * @filp: the file structure
2426  * @buffer: the user buffer
2427  * @lenp: the size of the user buffer
2428  * @ppos: file position
2429  *
2430  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2431  * values from/to the user buffer, treated as an ASCII string.
2432  * The values read are assumed to be in seconds, and are converted into
2433  * jiffies.
2434  *
2435  * Returns 0 on success.
2436  */
2437 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2438                           void __user *buffer, size_t *lenp, loff_t *ppos)
2439 {
2440     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2441                             do_proc_dointvec_jiffies_conv,NULL);
2442 }
2443
2444 /**
2445  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2446  * @table: the sysctl table
2447  * @write: %TRUE if this is a write to the sysctl file
2448  * @filp: the file structure
2449  * @buffer: the user buffer
2450  * @lenp: the size of the user buffer
2451  * @ppos: pointer to the file position
2452  *
2453  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2454  * values from/to the user buffer, treated as an ASCII string.
2455  * The values read are assumed to be in 1/USER_HZ seconds, and
2456  * are converted into jiffies.
2457  *
2458  * Returns 0 on success.
2459  */
2460 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2461                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2462 {
2463     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2464                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2465 }
2466
2467 /**
2468  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2469  * @table: the sysctl table
2470  * @write: %TRUE if this is a write to the sysctl file
2471  * @filp: the file structure
2472  * @buffer: the user buffer
2473  * @lenp: the size of the user buffer
2474  * @ppos: file position
2475  * @ppos: the current position in the file
2476  *
2477  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2478  * values from/to the user buffer, treated as an ASCII string.
2479  * The values read are assumed to be in 1/1000 seconds, and
2480  * are converted into jiffies.
2481  *
2482  * Returns 0 on success.
2483  */
2484 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2485                              void __user *buffer, size_t *lenp, loff_t *ppos)
2486 {
2487         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2488                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2489 }
2490
2491 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2492                            void __user *buffer, size_t *lenp, loff_t *ppos)
2493 {
2494         struct pid *new_pid;
2495         pid_t tmp;
2496         int r;
2497
2498         tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
2499
2500         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2501                                lenp, ppos, NULL, NULL);
2502         if (r || !write)
2503                 return r;
2504
2505         new_pid = find_get_pid(tmp);
2506         if (!new_pid)
2507                 return -ESRCH;
2508
2509         put_pid(xchg(&cad_pid, new_pid));
2510         return 0;
2511 }
2512
2513 #else /* CONFIG_PROC_FS */
2514
2515 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2516                   void __user *buffer, size_t *lenp, loff_t *ppos)
2517 {
2518         return -ENOSYS;
2519 }
2520
2521 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2522                   void __user *buffer, size_t *lenp, loff_t *ppos)
2523 {
2524         return -ENOSYS;
2525 }
2526
2527 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2528                         void __user *buffer, size_t *lenp, loff_t *ppos)
2529 {
2530         return -ENOSYS;
2531 }
2532
2533 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2534                     void __user *buffer, size_t *lenp, loff_t *ppos)
2535 {
2536         return -ENOSYS;
2537 }
2538
2539 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2540                     void __user *buffer, size_t *lenp, loff_t *ppos)
2541 {
2542         return -ENOSYS;
2543 }
2544
2545 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2546                     void __user *buffer, size_t *lenp, loff_t *ppos)
2547 {
2548         return -ENOSYS;
2549 }
2550
2551 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2552                              void __user *buffer, size_t *lenp, loff_t *ppos)
2553 {
2554         return -ENOSYS;
2555 }
2556
2557 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2558                     void __user *buffer, size_t *lenp, loff_t *ppos)
2559 {
2560         return -ENOSYS;
2561 }
2562
2563 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2564                                       struct file *filp,
2565                                       void __user *buffer,
2566                                       size_t *lenp, loff_t *ppos)
2567 {
2568     return -ENOSYS;
2569 }
2570
2571
2572 #endif /* CONFIG_PROC_FS */
2573
2574
2575 #ifdef CONFIG_SYSCTL_SYSCALL
2576 /*
2577  * General sysctl support routines
2578  */
2579
2580 /* The generic sysctl data routine (used if no strategy routine supplied) */
2581 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2582                 void __user *oldval, size_t __user *oldlenp,
2583                 void __user *newval, size_t newlen)
2584 {
2585         size_t len;
2586
2587         /* Get out of I don't have a variable */
2588         if (!table->data || !table->maxlen)
2589                 return -ENOTDIR;
2590
2591         if (oldval && oldlenp) {
2592                 if (get_user(len, oldlenp))
2593                         return -EFAULT;
2594                 if (len) {
2595                         if (len > table->maxlen)
2596                                 len = table->maxlen;
2597                         if (copy_to_user(oldval, table->data, len))
2598                                 return -EFAULT;
2599                         if (put_user(len, oldlenp))
2600                                 return -EFAULT;
2601                 }
2602         }
2603
2604         if (newval && newlen) {
2605                 if (newlen > table->maxlen)
2606                         newlen = table->maxlen;
2607
2608                 if (copy_from_user(table->data, newval, newlen))
2609                         return -EFAULT;
2610         }
2611         return 1;
2612 }
2613
2614 /* The generic string strategy routine: */
2615 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2616                   void __user *oldval, size_t __user *oldlenp,
2617                   void __user *newval, size_t newlen)
2618 {
2619         if (!table->data || !table->maxlen)
2620                 return -ENOTDIR;
2621
2622         if (oldval && oldlenp) {
2623                 size_t bufsize;
2624                 if (get_user(bufsize, oldlenp))
2625                         return -EFAULT;
2626                 if (bufsize) {
2627                         size_t len = strlen(table->data), copied;
2628
2629                         /* This shouldn't trigger for a well-formed sysctl */
2630                         if (len > table->maxlen)
2631                                 len = table->maxlen;
2632
2633                         /* Copy up to a max of bufsize-1 bytes of the string */
2634                         copied = (len >= bufsize) ? bufsize - 1 : len;
2635
2636                         if (copy_to_user(oldval, table->data, copied) ||
2637                             put_user(0, (char __user *)(oldval + copied)))
2638                                 return -EFAULT;
2639                         if (put_user(len, oldlenp))
2640                                 return -EFAULT;
2641                 }
2642         }
2643         if (newval && newlen) {
2644                 size_t len = newlen;
2645                 if (len > table->maxlen)
2646                         len = table->maxlen;
2647                 if(copy_from_user(table->data, newval, len))
2648                         return -EFAULT;
2649                 if (len == table->maxlen)
2650                         len--;
2651                 ((char *) table->data)[len] = 0;
2652         }
2653         return 1;
2654 }
2655
2656 /*
2657  * This function makes sure that all of the integers in the vector
2658  * are between the minimum and maximum values given in the arrays
2659  * table->extra1 and table->extra2, respectively.
2660  */
2661 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2662                 void __user *oldval, size_t __user *oldlenp,
2663                 void __user *newval, size_t newlen)
2664 {
2665
2666         if (newval && newlen) {
2667                 int __user *vec = (int __user *) newval;
2668                 int *min = (int *) table->extra1;
2669                 int *max = (int *) table->extra2;
2670                 size_t length;
2671                 int i;
2672
2673                 if (newlen % sizeof(int) != 0)
2674                         return -EINVAL;
2675
2676                 if (!table->extra1 && !table->extra2)
2677                         return 0;
2678
2679                 if (newlen > table->maxlen)
2680                         newlen = table->maxlen;
2681                 length = newlen / sizeof(int);
2682
2683                 for (i = 0; i < length; i++) {
2684                         int value;
2685                         if (get_user(value, vec + i))
2686                                 return -EFAULT;
2687                         if (min && value < min[i])
2688                                 return -EINVAL;
2689                         if (max && value > max[i])
2690                                 return -EINVAL;
2691                 }
2692         }
2693         return 0;
2694 }
2695
2696 /* Strategy function to convert jiffies to seconds */
2697 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2698                 void __user *oldval, size_t __user *oldlenp,
2699                 void __user *newval, size_t newlen)
2700 {
2701         if (oldval && oldlenp) {
2702                 size_t olen;
2703
2704                 if (get_user(olen, oldlenp))
2705                         return -EFAULT;
2706                 if (olen) {
2707                         int val;
2708
2709                         if (olen < sizeof(int))
2710                                 return -EINVAL;
2711
2712                         val = *(int *)(table->data) / HZ;
2713                         if (put_user(val, (int __user *)oldval))
2714                                 return -EFAULT;
2715                         if (put_user(sizeof(int), oldlenp))
2716                                 return -EFAULT;
2717                 }
2718         }
2719         if (newval && newlen) {
2720                 int new;
2721                 if (newlen != sizeof(int))
2722                         return -EINVAL;
2723                 if (get_user(new, (int __user *)newval))
2724                         return -EFAULT;
2725                 *(int *)(table->data) = new*HZ;
2726         }
2727         return 1;
2728 }
2729
2730 /* Strategy function to convert jiffies to seconds */
2731 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2732                 void __user *oldval, size_t __user *oldlenp,
2733                 void __user *newval, size_t newlen)
2734 {
2735         if (oldval && oldlenp) {
2736                 size_t olen;
2737
2738                 if (get_user(olen, oldlenp))
2739                         return -EFAULT;
2740                 if (olen) {
2741                         int val;
2742
2743                         if (olen < sizeof(int))
2744                                 return -EINVAL;
2745
2746                         val = jiffies_to_msecs(*(int *)(table->data));
2747                         if (put_user(val, (int __user *)oldval))
2748                                 return -EFAULT;
2749                         if (put_user(sizeof(int), oldlenp))
2750                                 return -EFAULT;
2751                 }
2752         }
2753         if (newval && newlen) {
2754                 int new;
2755                 if (newlen != sizeof(int))
2756                         return -EINVAL;
2757                 if (get_user(new, (int __user *)newval))
2758                         return -EFAULT;
2759                 *(int *)(table->data) = msecs_to_jiffies(new);
2760         }
2761         return 1;
2762 }
2763
2764
2765
2766 #else /* CONFIG_SYSCTL_SYSCALL */
2767
2768
2769 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2770 {
2771         struct __sysctl_args tmp;
2772         int error;
2773
2774         if (copy_from_user(&tmp, args, sizeof(tmp)))
2775                 return -EFAULT;
2776
2777         error = deprecated_sysctl_warning(&tmp);
2778
2779         /* If no error reading the parameters then just -ENOSYS ... */
2780         if (!error)
2781                 error = -ENOSYS;
2782
2783         return error;
2784 }
2785
2786 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2787                   void __user *oldval, size_t __user *oldlenp,
2788                   void __user *newval, size_t newlen)
2789 {
2790         return -ENOSYS;
2791 }
2792
2793 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2794                   void __user *oldval, size_t __user *oldlenp,
2795                   void __user *newval, size_t newlen)
2796 {
2797         return -ENOSYS;
2798 }
2799
2800 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2801                 void __user *oldval, size_t __user *oldlenp,
2802                 void __user *newval, size_t newlen)
2803 {
2804         return -ENOSYS;
2805 }
2806
2807 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2808                 void __user *oldval, size_t __user *oldlenp,
2809                 void __user *newval, size_t newlen)
2810 {
2811         return -ENOSYS;
2812 }
2813
2814 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2815                 void __user *oldval, size_t __user *oldlenp,
2816                 void __user *newval, size_t newlen)
2817 {
2818         return -ENOSYS;
2819 }
2820
2821 #endif /* CONFIG_SYSCTL_SYSCALL */
2822
2823 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2824 {
2825         static int msg_count;
2826         int name[CTL_MAXNAME];
2827         int i;
2828
2829         /* Check args->nlen. */
2830         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2831                 return -ENOTDIR;
2832
2833         /* Read in the sysctl name for better debug message logging */
2834         for (i = 0; i < args->nlen; i++)
2835                 if (get_user(name[i], args->name + i))
2836                         return -EFAULT;
2837
2838         /* Ignore accesses to kernel.version */
2839         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2840                 return 0;
2841
2842         if (msg_count < 5) {
2843                 msg_count++;
2844                 printk(KERN_INFO
2845                         "warning: process `%s' used the deprecated sysctl "
2846                         "system call with ", current->comm);
2847                 for (i = 0; i < args->nlen; i++)
2848                         printk("%d.", name[i]);
2849                 printk("\n");
2850         }
2851         return 0;
2852 }
2853
2854 /*
2855  * No sense putting this after each symbol definition, twice,
2856  * exception granted :-)
2857  */
2858 EXPORT_SYMBOL(proc_dointvec);
2859 EXPORT_SYMBOL(proc_dointvec_jiffies);
2860 EXPORT_SYMBOL(proc_dointvec_minmax);
2861 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2862 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2863 EXPORT_SYMBOL(proc_dostring);
2864 EXPORT_SYMBOL(proc_doulongvec_minmax);
2865 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2866 EXPORT_SYMBOL(register_sysctl_table);
2867 EXPORT_SYMBOL(register_sysctl_paths);
2868 EXPORT_SYMBOL(sysctl_intvec);
2869 EXPORT_SYMBOL(sysctl_jiffies);
2870 EXPORT_SYMBOL(sysctl_ms_jiffies);
2871 EXPORT_SYMBOL(sysctl_string);
2872 EXPORT_SYMBOL(sysctl_data);
2873 EXPORT_SYMBOL(unregister_sysctl_table);