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/bitmap.h>
  27 #include <linux/signal.h>
  28 #include <linux/printk.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/security.h>
  31 #include <linux/ctype.h>
  32 #include <linux/kmemcheck.h>
  33 #include <linux/kmemleak.h>
  34 #include <linux/fs.h>
  35 #include <linux/init.h>
  36 #include <linux/kernel.h>
  37 #include <linux/kobject.h>
  38 #include <linux/net.h>
  39 #include <linux/sysrq.h>
  40 #include <linux/highuid.h>
  41 #include <linux/writeback.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/compaction.h>
  44 #include <linux/hugetlb.h>
  45 #include <linux/initrd.h>
  46 #include <linux/key.h>
  47 #include <linux/times.h>
  48 #include <linux/limits.h>
  49 #include <linux/dcache.h>
  50 #include <linux/dnotify.h>
  51 #include <linux/syscalls.h>
  52 #include <linux/vmstat.h>
  53 #include <linux/nfs_fs.h>
  54 #include <linux/acpi.h>
  55 #include <linux/reboot.h>
  56 #include <linux/ftrace.h>
  57 #include <linux/perf_event.h>
  58 #include <linux/kprobes.h>
  59 #include <linux/pipe_fs_i.h>
  60 #include <linux/oom.h>
  61 #include <linux/kmod.h>
  62 #include <linux/capability.h>
  63 #include <linux/binfmts.h>
  64 #include <linux/sched/sysctl.h>
  65 #include <linux/kexec.h>
  66
  67 #include <asm/uaccess.h>
  68 #include <asm/processor.h>
  69
  70 #ifdef CONFIG_X86
  71 #include <asm/nmi.h>
  72 #include <asm/stacktrace.h>
  73 #include <asm/io.h>
  74 #endif
  75 #ifdef CONFIG_SPARC
  76 #include <asm/setup.h>
  77 #endif
  78 #ifdef CONFIG_BSD_PROCESS_ACCT
  79 #include <linux/acct.h>
  80 #endif
  81 #ifdef CONFIG_RT_MUTEXES
  82 #include <linux/rtmutex.h>
  83 #endif
  84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  85 #include <linux/lockdep.h>
  86 #endif
  87 #ifdef CONFIG_CHR_DEV_SG
  88 #include <scsi/sg.h>
  89 #endif
  90
  91 #ifdef CONFIG_LOCKUP_DETECTOR
  92 #include <linux/nmi.h>
  93 #endif
  94
  95
  96 #if defined(CONFIG_SYSCTL)
  97
  98 /* External variables not in a header file. */
  99 extern int max_threads;
 100 extern int suid_dumpable;
 101 #ifdef CONFIG_COREDUMP
 102 extern int core_uses_pid;
 103 extern char core_pattern[];
 104 extern unsigned int core_pipe_limit;
 105 #endif
 106 extern int pid_max;
 107 extern int pid_max_min, pid_max_max;
 108 extern int percpu_pagelist_fraction;
 109 extern int compat_log;
 110 extern int latencytop_enabled;
 111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 112 #ifndef CONFIG_MMU
 113 extern int sysctl_nr_trim_pages;
 114 #endif
 115
 116 /* Constants used for minimum and  maximum */
 117 #ifdef CONFIG_LOCKUP_DETECTOR
 118 static int sixty = 60;
 119 #endif
 120
 121 static int __maybe_unused neg_one = -1;
 122
 123 static int zero;
 124 static int __maybe_unused one = 1;
 125 static int __maybe_unused two = 2;
 126 static int __maybe_unused four = 4;
 127 static unsigned long one_ul = 1;
 128 static int one_hundred = 100;
 129 #ifdef CONFIG_PRINTK
 130 static int ten_thousand = 10000;
 131 #endif
 132
 133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 135
 136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 137 static int maxolduid = 65535;
 138 static int minolduid;
 139 static int min_percpu_pagelist_fract = 8;
 140
 141 static int ngroups_max = NGROUPS_MAX;
 142 static const int cap_last_cap = CAP_LAST_CAP;
 143
 144 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
 145 #ifdef CONFIG_DETECT_HUNG_TASK
 146 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 147 #endif
 148
 149 #ifdef CONFIG_INOTIFY_USER
 150 #include <linux/inotify.h>
 151 #endif
 152 #ifdef CONFIG_SPARC
 153 #endif
 154
 155 #ifdef __hppa__
 156 extern int pwrsw_enabled;
 157 #endif
 158
 159 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 160 extern int unaligned_enabled;
 161 #endif
 162
 163 #ifdef CONFIG_IA64
 164 extern int unaligned_dump_stack;
 165 #endif
 166
 167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 168 extern int no_unaligned_warning;
 169 #endif
 170
 171 #ifdef CONFIG_PROC_SYSCTL
 172
 173 #define SYSCTL_WRITES_LEGACY    -1
 174 #define SYSCTL_WRITES_WARN       0
 175 #define SYSCTL_WRITES_STRICT     1
 176
 177 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
 178
 179 static int proc_do_cad_pid(struct ctl_table *table, int write,
 180                   void __user *buffer, size_t *lenp, loff_t *ppos);
 181 static int proc_taint(struct ctl_table *table, int write,
 182                                void __user *buffer, size_t *lenp, loff_t *ppos);
 183 #endif
 184
 185 #ifdef CONFIG_PRINTK
 186 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 187                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 188 #endif
 189
 190 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 191                 void __user *buffer, size_t *lenp, loff_t *ppos);
 192 #ifdef CONFIG_COREDUMP
 193 static int proc_dostring_coredump(struct ctl_table *table, int write,
 194                 void __user *buffer, size_t *lenp, loff_t *ppos);
 195 #endif
 196
 197 #ifdef CONFIG_MAGIC_SYSRQ
 198 /* Note: sysrq code uses it's own private copy */
 199 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 200
 201 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 202                                 void __user *buffer, size_t *lenp,
 203                                 loff_t *ppos)
 204 {
 205         int error;
 206
 207         error = proc_dointvec(table, write, buffer, lenp, ppos);
 208         if (error)
 209                 return error;
 210
 211         if (write)
 212                 sysrq_toggle_support(__sysrq_enabled);
 213
 214         return 0;
 215 }
 216
 217 #endif
 218
 219 static struct ctl_table kern_table[];
 220 static struct ctl_table vm_table[];
 221 static struct ctl_table fs_table[];
 222 static struct ctl_table debug_table[];
 223 static struct ctl_table dev_table[];
 224 extern struct ctl_table random_table[];
 225 #ifdef CONFIG_EPOLL
 226 extern struct ctl_table epoll_table[];
 227 #endif
 228
 229 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 230 int sysctl_legacy_va_layout;
 231 #endif
 232
 233 /* The default sysctl tables: */
 234
 235 static struct ctl_table sysctl_base_table[] = {
 236         {
 237                 .procname       = "kernel",
 238                 .mode           = 0555,
 239                 .child          = kern_table,
 240         },
 241         {
 242                 .procname       = "vm",
 243                 .mode           = 0555,
 244                 .child          = vm_table,
 245         },
 246         {
 247                 .procname       = "fs",
 248                 .mode           = 0555,
 249                 .child          = fs_table,
 250         },
 251         {
 252                 .procname       = "debug",
 253                 .mode           = 0555,
 254                 .child          = debug_table,
 255         },
 256         {
 257                 .procname       = "dev",
 258                 .mode           = 0555,
 259                 .child          = dev_table,
 260         },
 261         { }
 262 };
 263
 264 #ifdef CONFIG_SCHED_DEBUG
 265 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 266 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 267 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 268 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 269 #ifdef CONFIG_SMP
 270 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 271 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 272 #endif /* CONFIG_SMP */
 273 #endif /* CONFIG_SCHED_DEBUG */
 274
 275 #ifdef CONFIG_COMPACTION
 276 static int min_extfrag_threshold;
 277 static int max_extfrag_threshold = 1000;
 278 #endif
 279
 280 static struct ctl_table kern_table[] = {
 281         {
 282                 .procname       = "sched_child_runs_first",
 283                 .data           = &sysctl_sched_child_runs_first,
 284                 .maxlen         = sizeof(unsigned int),
 285                 .mode           = 0644,
 286                 .proc_handler   = proc_dointvec,
 287         },
 288 #ifdef CONFIG_SCHED_DEBUG
 289         {
 290                 .procname       = "sched_min_granularity_ns",
 291                 .data           = &sysctl_sched_min_granularity,
 292                 .maxlen         = sizeof(unsigned int),
 293                 .mode           = 0644,
 294                 .proc_handler   = sched_proc_update_handler,
 295                 .extra1         = &min_sched_granularity_ns,
 296                 .extra2         = &max_sched_granularity_ns,
 297         },
 298         {
 299                 .procname       = "sched_latency_ns",
 300                 .data           = &sysctl_sched_latency,
 301                 .maxlen         = sizeof(unsigned int),
 302                 .mode           = 0644,
 303                 .proc_handler   = sched_proc_update_handler,
 304                 .extra1         = &min_sched_granularity_ns,
 305                 .extra2         = &max_sched_granularity_ns,
 306         },
 307         {
 308                 .procname       = "sched_wakeup_granularity_ns",
 309                 .data           = &sysctl_sched_wakeup_granularity,
 310                 .maxlen         = sizeof(unsigned int),
 311                 .mode           = 0644,
 312                 .proc_handler   = sched_proc_update_handler,
 313                 .extra1         = &min_wakeup_granularity_ns,
 314                 .extra2         = &max_wakeup_granularity_ns,
 315         },
 316 #ifdef CONFIG_SMP
 317         {
 318                 .procname       = "sched_tunable_scaling",
 319                 .data           = &sysctl_sched_tunable_scaling,
 320                 .maxlen         = sizeof(enum sched_tunable_scaling),
 321                 .mode           = 0644,
 322                 .proc_handler   = sched_proc_update_handler,
 323                 .extra1         = &min_sched_tunable_scaling,
 324                 .extra2         = &max_sched_tunable_scaling,
 325         },
 326         {
 327                 .procname       = "sched_migration_cost_ns",
 328                 .data           = &sysctl_sched_migration_cost,
 329                 .maxlen         = sizeof(unsigned int),
 330                 .mode           = 0644,
 331                 .proc_handler   = proc_dointvec,
 332         },
 333         {
 334                 .procname       = "sched_nr_migrate",
 335                 .data           = &sysctl_sched_nr_migrate,
 336                 .maxlen         = sizeof(unsigned int),
 337                 .mode           = 0644,
 338                 .proc_handler   = proc_dointvec,
 339         },
 340         {
 341                 .procname       = "sched_time_avg_ms",
 342                 .data           = &sysctl_sched_time_avg,
 343                 .maxlen         = sizeof(unsigned int),
 344                 .mode           = 0644,
 345                 .proc_handler   = proc_dointvec,
 346         },
 347         {
 348                 .procname       = "sched_shares_window_ns",
 349                 .data           = &sysctl_sched_shares_window,
 350                 .maxlen         = sizeof(unsigned int),
 351                 .mode           = 0644,
 352                 .proc_handler   = proc_dointvec,
 353         },
 354         {
 355                 .procname       = "timer_migration",
 356                 .data           = &sysctl_timer_migration,
 357                 .maxlen         = sizeof(unsigned int),
 358                 .mode           = 0644,
 359                 .proc_handler   = proc_dointvec_minmax,
 360                 .extra1         = &zero,
 361                 .extra2         = &one,
 362         },
 363 #endif /* CONFIG_SMP */
 364 #ifdef CONFIG_NUMA_BALANCING
 365         {
 366                 .procname       = "numa_balancing_scan_delay_ms",
 367                 .data           = &sysctl_numa_balancing_scan_delay,
 368                 .maxlen         = sizeof(unsigned int),
 369                 .mode           = 0644,
 370                 .proc_handler   = proc_dointvec,
 371         },
 372         {
 373                 .procname       = "numa_balancing_scan_period_min_ms",
 374                 .data           = &sysctl_numa_balancing_scan_period_min,
 375                 .maxlen         = sizeof(unsigned int),
 376                 .mode           = 0644,
 377                 .proc_handler   = proc_dointvec,
 378         },
 379         {
 380                 .procname       = "numa_balancing_scan_period_max_ms",
 381                 .data           = &sysctl_numa_balancing_scan_period_max,
 382                 .maxlen         = sizeof(unsigned int),
 383                 .mode           = 0644,
 384                 .proc_handler   = proc_dointvec,
 385         },
 386         {
 387                 .procname       = "numa_balancing_scan_size_mb",
 388                 .data           = &sysctl_numa_balancing_scan_size,
 389                 .maxlen         = sizeof(unsigned int),
 390                 .mode           = 0644,
 391                 .proc_handler   = proc_dointvec,
 392         },
 393         {
 394                 .procname       = "numa_balancing",
 395                 .data           = NULL, /* filled in by handler */
 396                 .maxlen         = sizeof(unsigned int),
 397                 .mode           = 0644,
 398                 .proc_handler   = sysctl_numa_balancing,
 399                 .extra1         = &zero,
 400                 .extra2         = &one,
 401         },
 402 #endif /* CONFIG_NUMA_BALANCING */
 403 #endif /* CONFIG_SCHED_DEBUG */
 404         {
 405                 .procname       = "sched_rt_period_us",
 406                 .data           = &sysctl_sched_rt_period,
 407                 .maxlen         = sizeof(unsigned int),
 408                 .mode           = 0644,
 409                 .proc_handler   = sched_rt_handler,
 410         },
 411         {
 412                 .procname       = "sched_rt_runtime_us",
 413                 .data           = &sysctl_sched_rt_runtime,
 414                 .maxlen         = sizeof(int),
 415                 .mode           = 0644,
 416                 .proc_handler   = sched_rt_handler,
 417         },
 418         {
 419                 .procname       = "sched_rr_timeslice_ms",
 420                 .data           = &sched_rr_timeslice,
 421                 .maxlen         = sizeof(int),
 422                 .mode           = 0644,
 423                 .proc_handler   = sched_rr_handler,
 424         },
 425 #ifdef CONFIG_SCHED_AUTOGROUP
 426         {
 427                 .procname       = "sched_autogroup_enabled",
 428                 .data           = &sysctl_sched_autogroup_enabled,
 429                 .maxlen         = sizeof(unsigned int),
 430                 .mode           = 0644,
 431                 .proc_handler   = proc_dointvec_minmax,
 432                 .extra1         = &zero,
 433                 .extra2         = &one,
 434         },
 435 #endif
 436 #ifdef CONFIG_CFS_BANDWIDTH
 437         {
 438                 .procname       = "sched_cfs_bandwidth_slice_us",
 439                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 440                 .maxlen         = sizeof(unsigned int),
 441                 .mode           = 0644,
 442                 .proc_handler   = proc_dointvec_minmax,
 443                 .extra1         = &one,
 444         },
 445 #endif
 446 #ifdef CONFIG_PROVE_LOCKING
 447         {
 448                 .procname       = "prove_locking",
 449                 .data           = &prove_locking,
 450                 .maxlen         = sizeof(int),
 451                 .mode           = 0644,
 452                 .proc_handler   = proc_dointvec,
 453         },
 454 #endif
 455 #ifdef CONFIG_LOCK_STAT
 456         {
 457                 .procname       = "lock_stat",
 458                 .data           = &lock_stat,
 459                 .maxlen         = sizeof(int),
 460                 .mode           = 0644,
 461                 .proc_handler   = proc_dointvec,
 462         },
 463 #endif
 464         {
 465                 .procname       = "panic",
 466                 .data           = &panic_timeout,
 467                 .maxlen         = sizeof(int),
 468                 .mode           = 0644,
 469                 .proc_handler   = proc_dointvec,
 470         },
 471 #ifdef CONFIG_COREDUMP
 472         {
 473                 .procname       = "core_uses_pid",
 474                 .data           = &core_uses_pid,
 475                 .maxlen         = sizeof(int),
 476                 .mode           = 0644,
 477                 .proc_handler   = proc_dointvec,
 478         },
 479         {
 480                 .procname       = "core_pattern",
 481                 .data           = core_pattern,
 482                 .maxlen         = CORENAME_MAX_SIZE,
 483                 .mode           = 0644,
 484                 .proc_handler   = proc_dostring_coredump,
 485         },
 486         {
 487                 .procname       = "core_pipe_limit",
 488                 .data           = &core_pipe_limit,
 489                 .maxlen         = sizeof(unsigned int),
 490                 .mode           = 0644,
 491                 .proc_handler   = proc_dointvec,
 492         },
 493 #endif
 494 #ifdef CONFIG_PROC_SYSCTL
 495         {
 496                 .procname       = "tainted",
 497                 .maxlen         = sizeof(long),
 498                 .mode           = 0644,
 499                 .proc_handler   = proc_taint,
 500         },
 501         {
 502                 .procname       = "sysctl_writes_strict",
 503                 .data           = &sysctl_writes_strict,
 504                 .maxlen         = sizeof(int),
 505                 .mode           = 0644,
 506                 .proc_handler   = proc_dointvec_minmax,
 507                 .extra1         = &neg_one,
 508                 .extra2         = &one,
 509         },
 510 #endif
 511 #ifdef CONFIG_LATENCYTOP
 512         {
 513                 .procname       = "latencytop",
 514                 .data           = &latencytop_enabled,
 515                 .maxlen         = sizeof(int),
 516                 .mode           = 0644,
 517                 .proc_handler   = proc_dointvec,
 518         },
 519 #endif
 520 #ifdef CONFIG_BLK_DEV_INITRD
 521         {
 522                 .procname       = "real-root-dev",
 523                 .data           = &real_root_dev,
 524                 .maxlen         = sizeof(int),
 525                 .mode           = 0644,
 526                 .proc_handler   = proc_dointvec,
 527         },
 528 #endif
 529         {
 530                 .procname       = "print-fatal-signals",
 531                 .data           = &print_fatal_signals,
 532                 .maxlen         = sizeof(int),
 533                 .mode           = 0644,
 534                 .proc_handler   = proc_dointvec,
 535         },
 536 #ifdef CONFIG_SPARC
 537         {
 538                 .procname       = "reboot-cmd",
 539                 .data           = reboot_command,
 540                 .maxlen         = 256,
 541                 .mode           = 0644,
 542                 .proc_handler   = proc_dostring,
 543         },
 544         {
 545                 .procname       = "stop-a",
 546                 .data           = &stop_a_enabled,
 547                 .maxlen         = sizeof (int),
 548                 .mode           = 0644,
 549                 .proc_handler   = proc_dointvec,
 550         },
 551         {
 552                 .procname       = "scons-poweroff",
 553                 .data           = &scons_pwroff,
 554                 .maxlen         = sizeof (int),
 555                 .mode           = 0644,
 556                 .proc_handler   = proc_dointvec,
 557         },
 558 #endif
 559 #ifdef CONFIG_SPARC64
 560         {
 561                 .procname       = "tsb-ratio",
 562                 .data           = &sysctl_tsb_ratio,
 563                 .maxlen         = sizeof (int),
 564                 .mode           = 0644,
 565                 .proc_handler   = proc_dointvec,
 566         },
 567 #endif
 568 #ifdef __hppa__
 569         {
 570                 .procname       = "soft-power",
 571                 .data           = &pwrsw_enabled,
 572                 .maxlen         = sizeof (int),
 573                 .mode           = 0644,
 574                 .proc_handler   = proc_dointvec,
 575         },
 576 #endif
 577 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 578         {
 579                 .procname       = "unaligned-trap",
 580                 .data           = &unaligned_enabled,
 581                 .maxlen         = sizeof (int),
 582                 .mode           = 0644,
 583                 .proc_handler   = proc_dointvec,
 584         },
 585 #endif
 586         {
 587                 .procname       = "ctrl-alt-del",
 588                 .data           = &C_A_D,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = proc_dointvec,
 592         },
 593 #ifdef CONFIG_FUNCTION_TRACER
 594         {
 595                 .procname       = "ftrace_enabled",
 596                 .data           = &ftrace_enabled,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = ftrace_enable_sysctl,
 600         },
 601 #endif
 602 #ifdef CONFIG_STACK_TRACER
 603         {
 604                 .procname       = "stack_tracer_enabled",
 605                 .data           = &stack_tracer_enabled,
 606                 .maxlen         = sizeof(int),
 607                 .mode           = 0644,
 608                 .proc_handler   = stack_trace_sysctl,
 609         },
 610 #endif
 611 #ifdef CONFIG_TRACING
 612         {
 613                 .procname       = "ftrace_dump_on_oops",
 614                 .data           = &ftrace_dump_on_oops,
 615                 .maxlen         = sizeof(int),
 616                 .mode           = 0644,
 617                 .proc_handler   = proc_dointvec,
 618         },
 619         {
 620                 .procname       = "traceoff_on_warning",
 621                 .data           = &__disable_trace_on_warning,
 622                 .maxlen         = sizeof(__disable_trace_on_warning),
 623                 .mode           = 0644,
 624                 .proc_handler   = proc_dointvec,
 625         },
 626 #endif
 627 #ifdef CONFIG_KEXEC
 628         {
 629                 .procname       = "kexec_load_disabled",
 630                 .data           = &kexec_load_disabled,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 /* only handle a transition from default "0" to "1" */
 634                 .proc_handler   = proc_dointvec_minmax,
 635                 .extra1         = &one,
 636                 .extra2         = &one,
 637         },
 638 #endif
 639 #ifdef CONFIG_MODULES
 640         {
 641                 .procname       = "modprobe",
 642                 .data           = &modprobe_path,
 643                 .maxlen         = KMOD_PATH_LEN,
 644                 .mode           = 0644,
 645                 .proc_handler   = proc_dostring,
 646         },
 647         {
 648                 .procname       = "modules_disabled",
 649                 .data           = &modules_disabled,
 650                 .maxlen         = sizeof(int),
 651                 .mode           = 0644,
 652                 /* only handle a transition from default "0" to "1" */
 653                 .proc_handler   = proc_dointvec_minmax,
 654                 .extra1         = &one,
 655                 .extra2         = &one,
 656         },
 657 #endif
 658 #ifdef CONFIG_UEVENT_HELPER
 659         {
 660                 .procname       = "hotplug",
 661                 .data           = &uevent_helper,
 662                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 663                 .mode           = 0644,
 664                 .proc_handler   = proc_dostring,
 665         },
 666 #endif
 667 #ifdef CONFIG_CHR_DEV_SG
 668         {
 669                 .procname       = "sg-big-buff",
 670                 .data           = &sg_big_buff,
 671                 .maxlen         = sizeof (int),
 672                 .mode           = 0444,
 673                 .proc_handler   = proc_dointvec,
 674         },
 675 #endif
 676 #ifdef CONFIG_BSD_PROCESS_ACCT
 677         {
 678                 .procname       = "acct",
 679                 .data           = &acct_parm,
 680                 .maxlen         = 3*sizeof(int),
 681                 .mode           = 0644,
 682                 .proc_handler   = proc_dointvec,
 683         },
 684 #endif
 685 #ifdef CONFIG_MAGIC_SYSRQ
 686         {
 687                 .procname       = "sysrq",
 688                 .data           = &__sysrq_enabled,
 689                 .maxlen         = sizeof (int),
 690                 .mode           = 0644,
 691                 .proc_handler   = sysrq_sysctl_handler,
 692         },
 693 #endif
 694 #ifdef CONFIG_PROC_SYSCTL
 695         {
 696                 .procname       = "cad_pid",
 697                 .data           = NULL,
 698                 .maxlen         = sizeof (int),
 699                 .mode           = 0600,
 700                 .proc_handler   = proc_do_cad_pid,
 701         },
 702 #endif
 703         {
 704                 .procname       = "threads-max",
 705                 .data           = &max_threads,
 706                 .maxlen         = sizeof(int),
 707                 .mode           = 0644,
 708                 .proc_handler   = proc_dointvec,
 709         },
 710         {
 711                 .procname       = "random",
 712                 .mode           = 0555,
 713                 .child          = random_table,
 714         },
 715         {
 716                 .procname       = "usermodehelper",
 717                 .mode           = 0555,
 718                 .child          = usermodehelper_table,
 719         },
 720         {
 721                 .procname       = "overflowuid",
 722                 .data           = &overflowuid,
 723                 .maxlen         = sizeof(int),
 724                 .mode           = 0644,
 725                 .proc_handler   = proc_dointvec_minmax,
 726                 .extra1         = &minolduid,
 727                 .extra2         = &maxolduid,
 728         },
 729         {
 730                 .procname       = "overflowgid",
 731                 .data           = &overflowgid,
 732                 .maxlen         = sizeof(int),
 733                 .mode           = 0644,
 734                 .proc_handler   = proc_dointvec_minmax,
 735                 .extra1         = &minolduid,
 736                 .extra2         = &maxolduid,
 737         },
 738 #ifdef CONFIG_S390
 739 #ifdef CONFIG_MATHEMU
 740         {
 741                 .procname       = "ieee_emulation_warnings",
 742                 .data           = &sysctl_ieee_emulation_warnings,
 743                 .maxlen         = sizeof(int),
 744                 .mode           = 0644,
 745                 .proc_handler   = proc_dointvec,
 746         },
 747 #endif
 748         {
 749                 .procname       = "userprocess_debug",
 750                 .data           = &show_unhandled_signals,
 751                 .maxlen         = sizeof(int),
 752                 .mode           = 0644,
 753                 .proc_handler   = proc_dointvec,
 754         },
 755 #endif
 756         {
 757                 .procname       = "pid_max",
 758                 .data           = &pid_max,
 759                 .maxlen         = sizeof (int),
 760                 .mode           = 0644,
 761                 .proc_handler   = proc_dointvec_minmax,
 762                 .extra1         = &pid_max_min,
 763                 .extra2         = &pid_max_max,
 764         },
 765         {
 766                 .procname       = "panic_on_oops",
 767                 .data           = &panic_on_oops,
 768                 .maxlen         = sizeof(int),
 769                 .mode           = 0644,
 770                 .proc_handler   = proc_dointvec,
 771         },
 772 #if defined CONFIG_PRINTK
 773         {
 774                 .procname       = "printk",
 775                 .data           = &console_loglevel,
 776                 .maxlen         = 4*sizeof(int),
 777                 .mode           = 0644,
 778                 .proc_handler   = proc_dointvec,
 779         },
 780         {
 781                 .procname       = "printk_ratelimit",
 782                 .data           = &printk_ratelimit_state.interval,
 783                 .maxlen         = sizeof(int),
 784                 .mode           = 0644,
 785                 .proc_handler   = proc_dointvec_jiffies,
 786         },
 787         {
 788                 .procname       = "printk_ratelimit_burst",
 789                 .data           = &printk_ratelimit_state.burst,
 790                 .maxlen         = sizeof(int),
 791                 .mode           = 0644,
 792                 .proc_handler   = proc_dointvec,
 793         },
 794         {
 795                 .procname       = "printk_delay",
 796                 .data           = &printk_delay_msec,
 797                 .maxlen         = sizeof(int),
 798                 .mode           = 0644,
 799                 .proc_handler   = proc_dointvec_minmax,
 800                 .extra1         = &zero,
 801                 .extra2         = &ten_thousand,
 802         },
 803         {
 804                 .procname       = "dmesg_restrict",
 805                 .data           = &dmesg_restrict,
 806                 .maxlen         = sizeof(int),
 807                 .mode           = 0644,
 808                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 809                 .extra1         = &zero,
 810                 .extra2         = &one,
 811         },
 812         {
 813                 .procname       = "kptr_restrict",
 814                 .data           = &kptr_restrict,
 815                 .maxlen         = sizeof(int),
 816                 .mode           = 0644,
 817                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 818                 .extra1         = &zero,
 819                 .extra2         = &two,
 820         },
 821 #endif
 822         {
 823                 .procname       = "ngroups_max",
 824                 .data           = &ngroups_max,
 825                 .maxlen         = sizeof (int),
 826                 .mode           = 0444,
 827                 .proc_handler   = proc_dointvec,
 828         },
 829         {
 830                 .procname       = "cap_last_cap",
 831                 .data           = (void *)&cap_last_cap,
 832                 .maxlen         = sizeof(int),
 833                 .mode           = 0444,
 834                 .proc_handler   = proc_dointvec,
 835         },
 836 #if defined(CONFIG_LOCKUP_DETECTOR)
 837         {
 838                 .procname       = "watchdog",
 839                 .data           = &watchdog_user_enabled,
 840                 .maxlen         = sizeof (int),
 841                 .mode           = 0644,
 842                 .proc_handler   = proc_dowatchdog,
 843                 .extra1         = &zero,
 844                 .extra2         = &one,
 845         },
 846         {
 847                 .procname       = "watchdog_thresh",
 848                 .data           = &watchdog_thresh,
 849                 .maxlen         = sizeof(int),
 850                 .mode           = 0644,
 851                 .proc_handler   = proc_dowatchdog,
 852                 .extra1         = &zero,
 853                 .extra2         = &sixty,
 854         },
 855         {
 856                 .procname       = "softlockup_panic",
 857                 .data           = &softlockup_panic,
 858                 .maxlen         = sizeof(int),
 859                 .mode           = 0644,
 860                 .proc_handler   = proc_dointvec_minmax,
 861                 .extra1         = &zero,
 862                 .extra2         = &one,
 863         },
 864         {
 865                 .procname       = "nmi_watchdog",
 866                 .data           = &watchdog_user_enabled,
 867                 .maxlen         = sizeof (int),
 868                 .mode           = 0644,
 869                 .proc_handler   = proc_dowatchdog,
 870                 .extra1         = &zero,
 871                 .extra2         = &one,
 872         },
 873 #endif
 874 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 875         {
 876                 .procname       = "unknown_nmi_panic",
 877                 .data           = &unknown_nmi_panic,
 878                 .maxlen         = sizeof (int),
 879                 .mode           = 0644,
 880                 .proc_handler   = proc_dointvec,
 881         },
 882 #endif
 883 #if defined(CONFIG_X86)
 884         {
 885                 .procname       = "panic_on_unrecovered_nmi",
 886                 .data           = &panic_on_unrecovered_nmi,
 887                 .maxlen         = sizeof(int),
 888                 .mode           = 0644,
 889                 .proc_handler   = proc_dointvec,
 890         },
 891         {
 892                 .procname       = "panic_on_io_nmi",
 893                 .data           = &panic_on_io_nmi,
 894                 .maxlen         = sizeof(int),
 895                 .mode           = 0644,
 896                 .proc_handler   = proc_dointvec,
 897         },
 898 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 899         {
 900                 .procname       = "panic_on_stackoverflow",
 901                 .data           = &sysctl_panic_on_stackoverflow,
 902                 .maxlen         = sizeof(int),
 903                 .mode           = 0644,
 904                 .proc_handler   = proc_dointvec,
 905         },
 906 #endif
 907         {
 908                 .procname       = "bootloader_type",
 909                 .data           = &bootloader_type,
 910                 .maxlen         = sizeof (int),
 911                 .mode           = 0444,
 912                 .proc_handler   = proc_dointvec,
 913         },
 914         {
 915                 .procname       = "bootloader_version",
 916                 .data           = &bootloader_version,
 917                 .maxlen         = sizeof (int),
 918                 .mode           = 0444,
 919                 .proc_handler   = proc_dointvec,
 920         },
 921         {
 922                 .procname       = "kstack_depth_to_print",
 923                 .data           = &kstack_depth_to_print,
 924                 .maxlen         = sizeof(int),
 925                 .mode           = 0644,
 926                 .proc_handler   = proc_dointvec,
 927         },
 928         {
 929                 .procname       = "io_delay_type",
 930                 .data           = &io_delay_type,
 931                 .maxlen         = sizeof(int),
 932                 .mode           = 0644,
 933                 .proc_handler   = proc_dointvec,
 934         },
 935 #endif
 936 #if defined(CONFIG_MMU)
 937         {
 938                 .procname       = "randomize_va_space",
 939                 .data           = &randomize_va_space,
 940                 .maxlen         = sizeof(int),
 941                 .mode           = 0644,
 942                 .proc_handler   = proc_dointvec,
 943         },
 944 #endif
 945 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 946         {
 947                 .procname       = "spin_retry",
 948                 .data           = &spin_retry,
 949                 .maxlen         = sizeof (int),
 950                 .mode           = 0644,
 951                 .proc_handler   = proc_dointvec,
 952         },
 953 #endif
 954 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 955         {
 956                 .procname       = "acpi_video_flags",
 957                 .data           = &acpi_realmode_flags,
 958                 .maxlen         = sizeof (unsigned long),
 959                 .mode           = 0644,
 960                 .proc_handler   = proc_doulongvec_minmax,
 961         },
 962 #endif
 963 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 964         {
 965                 .procname       = "ignore-unaligned-usertrap",
 966                 .data           = &no_unaligned_warning,
 967                 .maxlen         = sizeof (int),
 968                 .mode           = 0644,
 969                 .proc_handler   = proc_dointvec,
 970         },
 971 #endif
 972 #ifdef CONFIG_IA64
 973         {
 974                 .procname       = "unaligned-dump-stack",
 975                 .data           = &unaligned_dump_stack,
 976                 .maxlen         = sizeof (int),
 977                 .mode           = 0644,
 978                 .proc_handler   = proc_dointvec,
 979         },
 980 #endif
 981 #ifdef CONFIG_DETECT_HUNG_TASK
 982         {
 983                 .procname       = "hung_task_panic",
 984                 .data           = &sysctl_hung_task_panic,
 985                 .maxlen         = sizeof(int),
 986                 .mode           = 0644,
 987                 .proc_handler   = proc_dointvec_minmax,
 988                 .extra1         = &zero,
 989                 .extra2         = &one,
 990         },
 991         {
 992                 .procname       = "hung_task_check_count",
 993                 .data           = &sysctl_hung_task_check_count,
 994                 .maxlen         = sizeof(int),
 995                 .mode           = 0644,
 996                 .proc_handler   = proc_dointvec_minmax,
 997                 .extra1         = &zero,
 998         },
 999         {
1000                 .procname       = "hung_task_timeout_secs",
1001                 .data           = &sysctl_hung_task_timeout_secs,
1002                 .maxlen         = sizeof(unsigned long),
1003                 .mode           = 0644,
1004                 .proc_handler   = proc_dohung_task_timeout_secs,
1005                 .extra2         = &hung_task_timeout_max,
1006         },
1007         {
1008                 .procname       = "hung_task_warnings",
1009                 .data           = &sysctl_hung_task_warnings,
1010                 .maxlen         = sizeof(int),
1011                 .mode           = 0644,
1012                 .proc_handler   = proc_dointvec_minmax,
1013                 .extra1         = &neg_one,
1014         },
1015 #endif
1016 #ifdef CONFIG_COMPAT
1017         {
1018                 .procname       = "compat-log",
1019                 .data           = &compat_log,
1020                 .maxlen         = sizeof (int),
1021                 .mode           = 0644,
1022                 .proc_handler   = proc_dointvec,
1023         },
1024 #endif
1025 #ifdef CONFIG_RT_MUTEXES
1026         {
1027                 .procname       = "max_lock_depth",
1028                 .data           = &max_lock_depth,
1029                 .maxlen         = sizeof(int),
1030                 .mode           = 0644,
1031                 .proc_handler   = proc_dointvec,
1032         },
1033 #endif
1034         {
1035                 .procname       = "poweroff_cmd",
1036                 .data           = &poweroff_cmd,
1037                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1038                 .mode           = 0644,
1039                 .proc_handler   = proc_dostring,
1040         },
1041 #ifdef CONFIG_KEYS
1042         {
1043                 .procname       = "keys",
1044                 .mode           = 0555,
1045                 .child          = key_sysctls,
1046         },
1047 #endif
1048 #ifdef CONFIG_RCU_TORTURE_TEST
1049         {
1050                 .procname       = "rcutorture_runnable",
1051                 .data           = &rcutorture_runnable,
1052                 .maxlen         = sizeof(int),
1053                 .mode           = 0644,
1054                 .proc_handler   = proc_dointvec,
1055         },
1056 #endif
1057 #ifdef CONFIG_PERF_EVENTS
1058         /*
1059          * User-space scripts rely on the existence of this file
1060          * as a feature check for perf_events being enabled.
1061          *
1062          * So it's an ABI, do not remove!
1063          */
1064         {
1065                 .procname       = "perf_event_paranoid",
1066                 .data           = &sysctl_perf_event_paranoid,
1067                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1068                 .mode           = 0644,
1069                 .proc_handler   = proc_dointvec,
1070         },
1071         {
1072                 .procname       = "perf_event_mlock_kb",
1073                 .data           = &sysctl_perf_event_mlock,
1074                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1075                 .mode           = 0644,
1076                 .proc_handler   = proc_dointvec,
1077         },
1078         {
1079                 .procname       = "perf_event_max_sample_rate",
1080                 .data           = &sysctl_perf_event_sample_rate,
1081                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1082                 .mode           = 0644,
1083                 .proc_handler   = perf_proc_update_handler,
1084                 .extra1         = &one,
1085         },
1086         {
1087                 .procname       = "perf_cpu_time_max_percent",
1088                 .data           = &sysctl_perf_cpu_time_max_percent,
1089                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1090                 .mode           = 0644,
1091                 .proc_handler   = perf_cpu_time_max_percent_handler,
1092                 .extra1         = &zero,
1093                 .extra2         = &one_hundred,
1094         },
1095 #endif
1096 #ifdef CONFIG_KMEMCHECK
1097         {
1098                 .procname       = "kmemcheck",
1099                 .data           = &kmemcheck_enabled,
1100                 .maxlen         = sizeof(int),
1101                 .mode           = 0644,
1102                 .proc_handler   = proc_dointvec,
1103         },
1104 #endif
1105         { }
1106 };
1107
1108 static struct ctl_table vm_table[] = {
1109         {
1110                 .procname       = "overcommit_memory",
1111                 .data           = &sysctl_overcommit_memory,
1112                 .maxlen         = sizeof(sysctl_overcommit_memory),
1113                 .mode           = 0644,
1114                 .proc_handler   = proc_dointvec_minmax,
1115                 .extra1         = &zero,
1116                 .extra2         = &two,
1117         },
1118         {
1119                 .procname       = "panic_on_oom",
1120                 .data           = &sysctl_panic_on_oom,
1121                 .maxlen         = sizeof(sysctl_panic_on_oom),
1122                 .mode           = 0644,
1123                 .proc_handler   = proc_dointvec_minmax,
1124                 .extra1         = &zero,
1125                 .extra2         = &two,
1126         },
1127         {
1128                 .procname       = "oom_kill_allocating_task",
1129                 .data           = &sysctl_oom_kill_allocating_task,
1130                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1131                 .mode           = 0644,
1132                 .proc_handler   = proc_dointvec,
1133         },
1134         {
1135                 .procname       = "oom_dump_tasks",
1136                 .data           = &sysctl_oom_dump_tasks,
1137                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1138                 .mode           = 0644,
1139                 .proc_handler   = proc_dointvec,
1140         },
1141         {
1142                 .procname       = "overcommit_ratio",
1143                 .data           = &sysctl_overcommit_ratio,
1144                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1145                 .mode           = 0644,
1146                 .proc_handler   = overcommit_ratio_handler,
1147         },
1148         {
1149                 .procname       = "overcommit_kbytes",
1150                 .data           = &sysctl_overcommit_kbytes,
1151                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1152                 .mode           = 0644,
1153                 .proc_handler   = overcommit_kbytes_handler,
1154         },
1155         {
1156                 .procname       = "page-cluster",
1157                 .data           = &page_cluster,
1158                 .maxlen         = sizeof(int),
1159                 .mode           = 0644,
1160                 .proc_handler   = proc_dointvec_minmax,
1161                 .extra1         = &zero,
1162         },
1163         {
1164                 .procname       = "dirty_background_ratio",
1165                 .data           = &dirty_background_ratio,
1166                 .maxlen         = sizeof(dirty_background_ratio),
1167                 .mode           = 0644,
1168                 .proc_handler   = dirty_background_ratio_handler,
1169                 .extra1         = &zero,
1170                 .extra2         = &one_hundred,
1171         },
1172         {
1173                 .procname       = "dirty_background_bytes",
1174                 .data           = &dirty_background_bytes,
1175                 .maxlen         = sizeof(dirty_background_bytes),
1176                 .mode           = 0644,
1177                 .proc_handler   = dirty_background_bytes_handler,
1178                 .extra1         = &one_ul,
1179         },
1180         {
1181                 .procname       = "dirty_ratio",
1182                 .data           = &vm_dirty_ratio,
1183                 .maxlen         = sizeof(vm_dirty_ratio),
1184                 .mode           = 0644,
1185                 .proc_handler   = dirty_ratio_handler,
1186                 .extra1         = &zero,
1187                 .extra2         = &one_hundred,
1188         },
1189         {
1190                 .procname       = "dirty_bytes",
1191                 .data           = &vm_dirty_bytes,
1192                 .maxlen         = sizeof(vm_dirty_bytes),
1193                 .mode           = 0644,
1194                 .proc_handler   = dirty_bytes_handler,
1195                 .extra1         = &dirty_bytes_min,
1196         },
1197         {
1198                 .procname       = "dirty_writeback_centisecs",
1199                 .data           = &dirty_writeback_interval,
1200                 .maxlen         = sizeof(dirty_writeback_interval),
1201                 .mode           = 0644,
1202                 .proc_handler   = dirty_writeback_centisecs_handler,
1203         },
1204         {
1205                 .procname       = "dirty_expire_centisecs",
1206                 .data           = &dirty_expire_interval,
1207                 .maxlen         = sizeof(dirty_expire_interval),
1208                 .mode           = 0644,
1209                 .proc_handler   = proc_dointvec_minmax,
1210                 .extra1         = &zero,
1211         },
1212         {
1213                 .procname       = "nr_pdflush_threads",
1214                 .mode           = 0444 /* read-only */,
1215                 .proc_handler   = pdflush_proc_obsolete,
1216         },
1217         {
1218                 .procname       = "swappiness",
1219                 .data           = &vm_swappiness,
1220                 .maxlen         = sizeof(vm_swappiness),
1221                 .mode           = 0644,
1222                 .proc_handler   = proc_dointvec_minmax,
1223                 .extra1         = &zero,
1224                 .extra2         = &one_hundred,
1225         },
1226 #ifdef CONFIG_HUGETLB_PAGE
1227         {
1228                 .procname       = "nr_hugepages",
1229                 .data           = NULL,
1230                 .maxlen         = sizeof(unsigned long),
1231                 .mode           = 0644,
1232                 .proc_handler   = hugetlb_sysctl_handler,
1233                 .extra1         = (void *)&hugetlb_zero,
1234                 .extra2         = (void *)&hugetlb_infinity,
1235         },
1236 #ifdef CONFIG_NUMA
1237         {
1238                 .procname       = "nr_hugepages_mempolicy",
1239                 .data           = NULL,
1240                 .maxlen         = sizeof(unsigned long),
1241                 .mode           = 0644,
1242                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1243                 .extra1         = (void *)&hugetlb_zero,
1244                 .extra2         = (void *)&hugetlb_infinity,
1245         },
1246 #endif
1247          {
1248                 .procname       = "hugetlb_shm_group",
1249                 .data           = &sysctl_hugetlb_shm_group,
1250                 .maxlen         = sizeof(gid_t),
1251                 .mode           = 0644,
1252                 .proc_handler   = proc_dointvec,
1253          },
1254          {
1255                 .procname       = "hugepages_treat_as_movable",
1256                 .data           = &hugepages_treat_as_movable,
1257                 .maxlen         = sizeof(int),
1258                 .mode           = 0644,
1259                 .proc_handler   = proc_dointvec,
1260         },
1261         {
1262                 .procname       = "nr_overcommit_hugepages",
1263                 .data           = NULL,
1264                 .maxlen         = sizeof(unsigned long),
1265                 .mode           = 0644,
1266                 .proc_handler   = hugetlb_overcommit_handler,
1267                 .extra1         = (void *)&hugetlb_zero,
1268                 .extra2         = (void *)&hugetlb_infinity,
1269         },
1270 #endif
1271         {
1272                 .procname       = "lowmem_reserve_ratio",
1273                 .data           = &sysctl_lowmem_reserve_ratio,
1274                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1275                 .mode           = 0644,
1276                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1277         },
1278         {
1279                 .procname       = "drop_caches",
1280                 .data           = &sysctl_drop_caches,
1281                 .maxlen         = sizeof(int),
1282                 .mode           = 0644,
1283                 .proc_handler   = drop_caches_sysctl_handler,
1284                 .extra1         = &one,
1285                 .extra2         = &four,
1286         },
1287 #ifdef CONFIG_COMPACTION
1288         {
1289                 .procname       = "compact_memory",
1290                 .data           = &sysctl_compact_memory,
1291                 .maxlen         = sizeof(int),
1292                 .mode           = 0200,
1293                 .proc_handler   = sysctl_compaction_handler,
1294         },
1295         {
1296                 .procname       = "extfrag_threshold",
1297                 .data           = &sysctl_extfrag_threshold,
1298                 .maxlen         = sizeof(int),
1299                 .mode           = 0644,
1300                 .proc_handler   = sysctl_extfrag_handler,
1301                 .extra1         = &min_extfrag_threshold,
1302                 .extra2         = &max_extfrag_threshold,
1303         },
1304
1305 #endif /* CONFIG_COMPACTION */
1306         {
1307                 .procname       = "min_free_kbytes",
1308                 .data           = &min_free_kbytes,
1309                 .maxlen         = sizeof(min_free_kbytes),
1310                 .mode           = 0644,
1311                 .proc_handler   = min_free_kbytes_sysctl_handler,
1312                 .extra1         = &zero,
1313         },
1314         {
1315                 .procname       = "percpu_pagelist_fraction",
1316                 .data           = &percpu_pagelist_fraction,
1317                 .maxlen         = sizeof(percpu_pagelist_fraction),
1318                 .mode           = 0644,
1319                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1320                 .extra1         = &min_percpu_pagelist_fract,
1321         },
1322 #ifdef CONFIG_MMU
1323         {
1324                 .procname       = "max_map_count",
1325                 .data           = &sysctl_max_map_count,
1326                 .maxlen         = sizeof(sysctl_max_map_count),
1327                 .mode           = 0644,
1328                 .proc_handler   = proc_dointvec_minmax,
1329                 .extra1         = &zero,
1330         },
1331 #else
1332         {
1333                 .procname       = "nr_trim_pages",
1334                 .data           = &sysctl_nr_trim_pages,
1335                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1336                 .mode           = 0644,
1337                 .proc_handler   = proc_dointvec_minmax,
1338                 .extra1         = &zero,
1339         },
1340 #endif
1341         {
1342                 .procname       = "laptop_mode",
1343                 .data           = &laptop_mode,
1344                 .maxlen         = sizeof(laptop_mode),
1345                 .mode           = 0644,
1346                 .proc_handler   = proc_dointvec_jiffies,
1347         },
1348         {
1349                 .procname       = "block_dump",
1350                 .data           = &block_dump,
1351                 .maxlen         = sizeof(block_dump),
1352                 .mode           = 0644,
1353                 .proc_handler   = proc_dointvec,
1354                 .extra1         = &zero,
1355         },
1356         {
1357                 .procname       = "vfs_cache_pressure",
1358                 .data           = &sysctl_vfs_cache_pressure,
1359                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1360                 .mode           = 0644,
1361                 .proc_handler   = proc_dointvec,
1362                 .extra1         = &zero,
1363         },
1364 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1365         {
1366                 .procname       = "legacy_va_layout",
1367                 .data           = &sysctl_legacy_va_layout,
1368                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1369                 .mode           = 0644,
1370                 .proc_handler   = proc_dointvec,
1371                 .extra1         = &zero,
1372         },
1373 #endif
1374 #ifdef CONFIG_NUMA
1375         {
1376                 .procname       = "zone_reclaim_mode",
1377                 .data           = &zone_reclaim_mode,
1378                 .maxlen         = sizeof(zone_reclaim_mode),
1379                 .mode           = 0644,
1380                 .proc_handler   = proc_dointvec,
1381                 .extra1         = &zero,
1382         },
1383         {
1384                 .procname       = "min_unmapped_ratio",
1385                 .data           = &sysctl_min_unmapped_ratio,
1386                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1387                 .mode           = 0644,
1388                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1389                 .extra1         = &zero,
1390                 .extra2         = &one_hundred,
1391         },
1392         {
1393                 .procname       = "min_slab_ratio",
1394                 .data           = &sysctl_min_slab_ratio,
1395                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1396                 .mode           = 0644,
1397                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1398                 .extra1         = &zero,
1399                 .extra2         = &one_hundred,
1400         },
1401 #endif
1402 #ifdef CONFIG_SMP
1403         {
1404                 .procname       = "stat_interval",
1405                 .data           = &sysctl_stat_interval,
1406                 .maxlen         = sizeof(sysctl_stat_interval),
1407                 .mode           = 0644,
1408                 .proc_handler   = proc_dointvec_jiffies,
1409         },
1410 #endif
1411 #ifdef CONFIG_MMU
1412         {
1413                 .procname       = "mmap_min_addr",
1414                 .data           = &dac_mmap_min_addr,
1415                 .maxlen         = sizeof(unsigned long),
1416                 .mode           = 0644,
1417                 .proc_handler   = mmap_min_addr_handler,
1418         },
1419 #endif
1420 #ifdef CONFIG_NUMA
1421         {
1422                 .procname       = "numa_zonelist_order",
1423                 .data           = &numa_zonelist_order,
1424                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1425                 .mode           = 0644,
1426                 .proc_handler   = numa_zonelist_order_handler,
1427         },
1428 #endif
1429 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1430    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1431         {
1432                 .procname       = "vdso_enabled",
1433 #ifdef CONFIG_X86_32
1434                 .data           = &vdso32_enabled,
1435                 .maxlen         = sizeof(vdso32_enabled),
1436 #else
1437                 .data           = &vdso_enabled,
1438                 .maxlen         = sizeof(vdso_enabled),
1439 #endif
1440                 .mode           = 0644,
1441                 .proc_handler   = proc_dointvec,
1442                 .extra1         = &zero,
1443         },
1444 #endif
1445 #ifdef CONFIG_HIGHMEM
1446         {
1447                 .procname       = "highmem_is_dirtyable",
1448                 .data           = &vm_highmem_is_dirtyable,
1449                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1450                 .mode           = 0644,
1451                 .proc_handler   = proc_dointvec_minmax,
1452                 .extra1         = &zero,
1453                 .extra2         = &one,
1454         },
1455 #endif
1456         {
1457                 .procname       = "scan_unevictable_pages",
1458                 .data           = &scan_unevictable_pages,
1459                 .maxlen         = sizeof(scan_unevictable_pages),
1460                 .mode           = 0644,
1461                 .proc_handler   = scan_unevictable_handler,
1462         },
1463 #ifdef CONFIG_MEMORY_FAILURE
1464         {
1465                 .procname       = "memory_failure_early_kill",
1466                 .data           = &sysctl_memory_failure_early_kill,
1467                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1468                 .mode           = 0644,
1469                 .proc_handler   = proc_dointvec_minmax,
1470                 .extra1         = &zero,
1471                 .extra2         = &one,
1472         },
1473         {
1474                 .procname       = "memory_failure_recovery",
1475                 .data           = &sysctl_memory_failure_recovery,
1476                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1477                 .mode           = 0644,
1478                 .proc_handler   = proc_dointvec_minmax,
1479                 .extra1         = &zero,
1480                 .extra2         = &one,
1481         },
1482 #endif
1483         {
1484                 .procname       = "user_reserve_kbytes",
1485                 .data           = &sysctl_user_reserve_kbytes,
1486                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1487                 .mode           = 0644,
1488                 .proc_handler   = proc_doulongvec_minmax,
1489         },
1490         {
1491                 .procname       = "admin_reserve_kbytes",
1492                 .data           = &sysctl_admin_reserve_kbytes,
1493                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1494                 .mode           = 0644,
1495                 .proc_handler   = proc_doulongvec_minmax,
1496         },
1497         { }
1498 };
1499
1500 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1501 static struct ctl_table binfmt_misc_table[] = {
1502         { }
1503 };
1504 #endif
1505
1506 static struct ctl_table fs_table[] = {
1507         {
1508                 .procname       = "inode-nr",
1509                 .data           = &inodes_stat,
1510                 .maxlen         = 2*sizeof(long),
1511                 .mode           = 0444,
1512                 .proc_handler   = proc_nr_inodes,
1513         },
1514         {
1515                 .procname       = "inode-state",
1516                 .data           = &inodes_stat,
1517                 .maxlen         = 7*sizeof(long),
1518                 .mode           = 0444,
1519                 .proc_handler   = proc_nr_inodes,
1520         },
1521         {
1522                 .procname       = "file-nr",
1523                 .data           = &files_stat,
1524                 .maxlen         = sizeof(files_stat),
1525                 .mode           = 0444,
1526                 .proc_handler   = proc_nr_files,
1527         },
1528         {
1529                 .procname       = "file-max",
1530                 .data           = &files_stat.max_files,
1531                 .maxlen         = sizeof(files_stat.max_files),
1532                 .mode           = 0644,
1533                 .proc_handler   = proc_doulongvec_minmax,
1534         },
1535         {
1536                 .procname       = "nr_open",
1537                 .data           = &sysctl_nr_open,
1538                 .maxlen         = sizeof(int),
1539                 .mode           = 0644,
1540                 .proc_handler   = proc_dointvec_minmax,
1541                 .extra1         = &sysctl_nr_open_min,
1542                 .extra2         = &sysctl_nr_open_max,
1543         },
1544         {
1545                 .procname       = "dentry-state",
1546                 .data           = &dentry_stat,
1547                 .maxlen         = 6*sizeof(long),
1548                 .mode           = 0444,
1549                 .proc_handler   = proc_nr_dentry,
1550         },
1551         {
1552                 .procname       = "overflowuid",
1553                 .data           = &fs_overflowuid,
1554                 .maxlen         = sizeof(int),
1555                 .mode           = 0644,
1556                 .proc_handler   = proc_dointvec_minmax,
1557                 .extra1         = &minolduid,
1558                 .extra2         = &maxolduid,
1559         },
1560         {
1561                 .procname       = "overflowgid",
1562                 .data           = &fs_overflowgid,
1563                 .maxlen         = sizeof(int),
1564                 .mode           = 0644,
1565                 .proc_handler   = proc_dointvec_minmax,
1566                 .extra1         = &minolduid,
1567                 .extra2         = &maxolduid,
1568         },
1569 #ifdef CONFIG_FILE_LOCKING
1570         {
1571                 .procname       = "leases-enable",
1572                 .data           = &leases_enable,
1573                 .maxlen         = sizeof(int),
1574                 .mode           = 0644,
1575                 .proc_handler   = proc_dointvec,
1576         },
1577 #endif
1578 #ifdef CONFIG_DNOTIFY
1579         {
1580                 .procname       = "dir-notify-enable",
1581                 .data           = &dir_notify_enable,
1582                 .maxlen         = sizeof(int),
1583                 .mode           = 0644,
1584                 .proc_handler   = proc_dointvec,
1585         },
1586 #endif
1587 #ifdef CONFIG_MMU
1588 #ifdef CONFIG_FILE_LOCKING
1589         {
1590                 .procname       = "lease-break-time",
1591                 .data           = &lease_break_time,
1592                 .maxlen         = sizeof(int),
1593                 .mode           = 0644,
1594                 .proc_handler   = proc_dointvec,
1595         },
1596 #endif
1597 #ifdef CONFIG_AIO
1598         {
1599                 .procname       = "aio-nr",
1600                 .data           = &aio_nr,
1601                 .maxlen         = sizeof(aio_nr),
1602                 .mode           = 0444,
1603                 .proc_handler   = proc_doulongvec_minmax,
1604         },
1605         {
1606                 .procname       = "aio-max-nr",
1607                 .data           = &aio_max_nr,
1608                 .maxlen         = sizeof(aio_max_nr),
1609                 .mode           = 0644,
1610                 .proc_handler   = proc_doulongvec_minmax,
1611         },
1612 #endif /* CONFIG_AIO */
1613 #ifdef CONFIG_INOTIFY_USER
1614         {
1615                 .procname       = "inotify",
1616                 .mode           = 0555,
1617                 .child          = inotify_table,
1618         },
1619 #endif
1620 #ifdef CONFIG_EPOLL
1621         {
1622                 .procname       = "epoll",
1623                 .mode           = 0555,
1624                 .child          = epoll_table,
1625         },
1626 #endif
1627 #endif
1628         {
1629                 .procname       = "protected_symlinks",
1630                 .data           = &sysctl_protected_symlinks,
1631                 .maxlen         = sizeof(int),
1632                 .mode           = 0600,
1633                 .proc_handler   = proc_dointvec_minmax,
1634                 .extra1         = &zero,
1635                 .extra2         = &one,
1636         },
1637         {
1638                 .procname       = "protected_hardlinks",
1639                 .data           = &sysctl_protected_hardlinks,
1640                 .maxlen         = sizeof(int),
1641                 .mode           = 0600,
1642                 .proc_handler   = proc_dointvec_minmax,
1643                 .extra1         = &zero,
1644                 .extra2         = &one,
1645         },
1646         {
1647                 .procname       = "suid_dumpable",
1648                 .data           = &suid_dumpable,
1649                 .maxlen         = sizeof(int),
1650                 .mode           = 0644,
1651                 .proc_handler   = proc_dointvec_minmax_coredump,
1652                 .extra1         = &zero,
1653                 .extra2         = &two,
1654         },
1655 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1656         {
1657                 .procname       = "binfmt_misc",
1658                 .mode           = 0555,
1659                 .child          = binfmt_misc_table,
1660         },
1661 #endif
1662         {
1663                 .procname       = "pipe-max-size",
1664                 .data           = &pipe_max_size,
1665                 .maxlen         = sizeof(int),
1666                 .mode           = 0644,
1667                 .proc_handler   = &pipe_proc_fn,
1668                 .extra1         = &pipe_min_size,
1669         },
1670         { }
1671 };
1672
1673 static struct ctl_table debug_table[] = {
1674 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1675         {
1676                 .procname       = "exception-trace",
1677                 .data           = &show_unhandled_signals,
1678                 .maxlen         = sizeof(int),
1679                 .mode           = 0644,
1680                 .proc_handler   = proc_dointvec
1681         },
1682 #endif
1683 #if defined(CONFIG_OPTPROBES)
1684         {
1685                 .procname       = "kprobes-optimization",
1686                 .data           = &sysctl_kprobes_optimization,
1687                 .maxlen         = sizeof(int),
1688                 .mode           = 0644,
1689                 .proc_handler   = proc_kprobes_optimization_handler,
1690                 .extra1         = &zero,
1691                 .extra2         = &one,
1692         },
1693 #endif
1694         { }
1695 };
1696
1697 static struct ctl_table dev_table[] = {
1698         { }
1699 };
1700
1701 int __init sysctl_init(void)
1702 {
1703         struct ctl_table_header *hdr;
1704
1705         hdr = register_sysctl_table(sysctl_base_table);
1706         kmemleak_not_leak(hdr);
1707         return 0;
1708 }
1709
1710 #endif /* CONFIG_SYSCTL */
1711
1712 /*
1713  * /proc/sys support
1714  */
1715
1716 #ifdef CONFIG_PROC_SYSCTL
1717
1718 static int _proc_do_string(char *data, int maxlen, int write,
1719                            char __user *buffer,
1720                            size_t *lenp, loff_t *ppos)
1721 {
1722         size_t len;
1723         char __user *p;
1724         char c;
1725
1726         if (!data || !maxlen || !*lenp) {
1727                 *lenp = 0;
1728                 return 0;
1729         }
1730
1731         if (write) {
1732                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1733                         /* Only continue writes not past the end of buffer. */
1734                         len = strlen(data);
1735                         if (len > maxlen - 1)
1736                                 len = maxlen - 1;
1737
1738                         if (*ppos > len)
1739                                 return 0;
1740                         len = *ppos;
1741                 } else {
1742                         /* Start writing from beginning of buffer. */
1743                         len = 0;
1744                 }
1745
1746                 *ppos += *lenp;
1747                 p = buffer;
1748                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1749                         if (get_user(c, p++))
1750                                 return -EFAULT;
1751                         if (c == 0 || c == '\n')
1752                                 break;
1753                         data[len++] = c;
1754                 }
1755                 data[len] = 0;
1756         } else {
1757                 len = strlen(data);
1758                 if (len > maxlen)
1759                         len = maxlen;
1760
1761                 if (*ppos > len) {
1762                         *lenp = 0;
1763                         return 0;
1764                 }
1765
1766                 data += *ppos;
1767                 len  -= *ppos;
1768
1769                 if (len > *lenp)
1770                         len = *lenp;
1771                 if (len)
1772                         if (copy_to_user(buffer, data, len))
1773                                 return -EFAULT;
1774                 if (len < *lenp) {
1775                         if (put_user('\n', buffer + len))
1776                                 return -EFAULT;
1777                         len++;
1778                 }
1779                 *lenp = len;
1780                 *ppos += len;
1781         }
1782         return 0;
1783 }
1784
1785 static void warn_sysctl_write(struct ctl_table *table)
1786 {
1787         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1788                 "This will not be supported in the future. To silence this\n"
1789                 "warning, set kernel.sysctl_writes_strict = -1\n",
1790                 current->comm, table->procname);
1791 }
1792
1793 /**
1794  * proc_dostring - read a string sysctl
1795  * @table: the sysctl table
1796  * @write: %TRUE if this is a write to the sysctl file
1797  * @buffer: the user buffer
1798  * @lenp: the size of the user buffer
1799  * @ppos: file position
1800  *
1801  * Reads/writes a string from/to the user buffer. If the kernel
1802  * buffer provided is not large enough to hold the string, the
1803  * string is truncated. The copied string is %NULL-terminated.
1804  * If the string is being read by the user process, it is copied
1805  * and a newline '\n' is added. It is truncated if the buffer is
1806  * not large enough.
1807  *
1808  * Returns 0 on success.
1809  */
1810 int proc_dostring(struct ctl_table *table, int write,
1811                   void __user *buffer, size_t *lenp, loff_t *ppos)
1812 {
1813         if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1814                 warn_sysctl_write(table);
1815
1816         return _proc_do_string((char *)(table->data), table->maxlen, write,
1817                                (char __user *)buffer, lenp, ppos);
1818 }
1819
1820 static size_t proc_skip_spaces(char **buf)
1821 {
1822         size_t ret;
1823         char *tmp = skip_spaces(*buf);
1824         ret = tmp - *buf;
1825         *buf = tmp;
1826         return ret;
1827 }
1828
1829 static void proc_skip_char(char **buf, size_t *size, const char v)
1830 {
1831         while (*size) {
1832                 if (**buf != v)
1833                         break;
1834                 (*size)--;
1835                 (*buf)++;
1836         }
1837 }
1838
1839 #define TMPBUFLEN 22
1840 /**
1841  * proc_get_long - reads an ASCII formatted integer from a user buffer
1842  *
1843  * @buf: a kernel buffer
1844  * @size: size of the kernel buffer
1845  * @val: this is where the number will be stored
1846  * @neg: set to %TRUE if number is negative
1847  * @perm_tr: a vector which contains the allowed trailers
1848  * @perm_tr_len: size of the perm_tr vector
1849  * @tr: pointer to store the trailer character
1850  *
1851  * In case of success %0 is returned and @buf and @size are updated with
1852  * the amount of bytes read. If @tr is non-NULL and a trailing
1853  * character exists (size is non-zero after returning from this
1854  * function), @tr is updated with the trailing character.
1855  */
1856 static int proc_get_long(char **buf, size_t *size,
1857                           unsigned long *val, bool *neg,
1858                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1859 {
1860         int len;
1861         char *p, tmp[TMPBUFLEN];
1862
1863         if (!*size)
1864                 return -EINVAL;
1865
1866         len = *size;
1867         if (len > TMPBUFLEN - 1)
1868                 len = TMPBUFLEN - 1;
1869
1870         memcpy(tmp, *buf, len);
1871
1872         tmp[len] = 0;
1873         p = tmp;
1874         if (*p == '-' && *size > 1) {
1875                 *neg = true;
1876                 p++;
1877         } else
1878                 *neg = false;
1879         if (!isdigit(*p))
1880                 return -EINVAL;
1881
1882         *val = simple_strtoul(p, &p, 0);
1883
1884         len = p - tmp;
1885
1886         /* We don't know if the next char is whitespace thus we may accept
1887          * invalid integers (e.g. 1234...a) or two integers instead of one
1888          * (e.g. 123...1). So lets not allow such large numbers. */
1889         if (len == TMPBUFLEN - 1)
1890                 return -EINVAL;
1891
1892         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1893                 return -EINVAL;
1894
1895         if (tr && (len < *size))
1896                 *tr = *p;
1897
1898         *buf += len;
1899         *size -= len;
1900
1901         return 0;
1902 }
1903
1904 /**
1905  * proc_put_long - converts an integer to a decimal ASCII formatted string
1906  *
1907  * @buf: the user buffer
1908  * @size: the size of the user buffer
1909  * @val: the integer to be converted
1910  * @neg: sign of the number, %TRUE for negative
1911  *
1912  * In case of success %0 is returned and @buf and @size are updated with
1913  * the amount of bytes written.
1914  */
1915 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1916                           bool neg)
1917 {
1918         int len;
1919         char tmp[TMPBUFLEN], *p = tmp;
1920
1921         sprintf(p, "%s%lu", neg ? "-" : "", val);
1922         len = strlen(tmp);
1923         if (len > *size)
1924                 len = *size;
1925         if (copy_to_user(*buf, tmp, len))
1926                 return -EFAULT;
1927         *size -= len;
1928         *buf += len;
1929         return 0;
1930 }
1931 #undef TMPBUFLEN
1932
1933 static int proc_put_char(void __user **buf, size_t *size, char c)
1934 {
1935         if (*size) {
1936                 char __user **buffer = (char __user **)buf;
1937                 if (put_user(c, *buffer))
1938                         return -EFAULT;
1939                 (*size)--, (*buffer)++;
1940                 *buf = *buffer;
1941         }
1942         return 0;
1943 }
1944
1945 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1946                                  int *valp,
1947                                  int write, void *data)
1948 {
1949         if (write) {
1950                 *valp = *negp ? -*lvalp : *lvalp;
1951         } else {
1952                 int val = *valp;
1953                 if (val < 0) {
1954                         *negp = true;
1955                         *lvalp = (unsigned long)-val;
1956                 } else {
1957                         *negp = false;
1958                         *lvalp = (unsigned long)val;
1959                 }
1960         }
1961         return 0;
1962 }
1963
1964 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1965
1966 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1967                   int write, void __user *buffer,
1968                   size_t *lenp, loff_t *ppos,
1969                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1970                               int write, void *data),
1971                   void *data)
1972 {
1973         int *i, vleft, first = 1, err = 0;
1974         unsigned long page = 0;
1975         size_t left;
1976         char *kbuf;
1977
1978         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1979                 *lenp = 0;
1980                 return 0;
1981         }
1982
1983         i = (int *) tbl_data;
1984         vleft = table->maxlen / sizeof(*i);
1985         left = *lenp;
1986
1987         if (!conv)
1988                 conv = do_proc_dointvec_conv;
1989
1990         if (write) {
1991                 if (*ppos) {
1992                         switch (sysctl_writes_strict) {
1993                         case SYSCTL_WRITES_STRICT:
1994                                 goto out;
1995                         case SYSCTL_WRITES_WARN:
1996                                 warn_sysctl_write(table);
1997                                 break;
1998                         default:
1999                                 break;
2000                         }
2001                 }
2002
2003                 if (left > PAGE_SIZE - 1)
2004                         left = PAGE_SIZE - 1;
2005                 page = __get_free_page(GFP_TEMPORARY);
2006                 kbuf = (char *) page;
2007                 if (!kbuf)
2008                         return -ENOMEM;
2009                 if (copy_from_user(kbuf, buffer, left)) {
2010                         err = -EFAULT;
2011                         goto free;
2012                 }
2013                 kbuf[left] = 0;
2014         }
2015
2016         for (; left && vleft--; i++, first=0) {
2017                 unsigned long lval;
2018                 bool neg;
2019
2020                 if (write) {
2021                         left -= proc_skip_spaces(&kbuf);
2022
2023                         if (!left)
2024                                 break;
2025                         err = proc_get_long(&kbuf, &left, &lval, &neg,
2026                                              proc_wspace_sep,
2027                                              sizeof(proc_wspace_sep), NULL);
2028                         if (err)
2029                                 break;
2030                         if (conv(&neg, &lval, i, 1, data)) {
2031                                 err = -EINVAL;
2032                                 break;
2033                         }
2034                 } else {
2035                         if (conv(&neg, &lval, i, 0, data)) {
2036                                 err = -EINVAL;
2037                                 break;
2038                         }
2039                         if (!first)
2040                                 err = proc_put_char(&buffer, &left, '\t');
2041                         if (err)
2042                                 break;
2043                         err = proc_put_long(&buffer, &left, lval, neg);
2044                         if (err)
2045                                 break;
2046                 }
2047         }
2048
2049         if (!write && !first && left && !err)
2050                 err = proc_put_char(&buffer, &left, '\n');
2051         if (write && !err && left)
2052                 left -= proc_skip_spaces(&kbuf);
2053 free:
2054         if (write) {
2055                 free_page(page);
2056                 if (first)
2057                         return err ? : -EINVAL;
2058         }
2059         *lenp -= left;
2060 out:
2061         *ppos += *lenp;
2062         return err;
2063 }
2064
2065 static int do_proc_dointvec(struct ctl_table *table, int write,
2066                   void __user *buffer, size_t *lenp, loff_t *ppos,
2067                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2068                               int write, void *data),
2069                   void *data)
2070 {
2071         return __do_proc_dointvec(table->data, table, write,
2072                         buffer, lenp, ppos, conv, data);
2073 }
2074
2075 /**
2076  * proc_dointvec - read a vector of integers
2077  * @table: the sysctl table
2078  * @write: %TRUE if this is a write to the sysctl file
2079  * @buffer: the user buffer
2080  * @lenp: the size of the user buffer
2081  * @ppos: file position
2082  *
2083  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2084  * values from/to the user buffer, treated as an ASCII string.
2085  *
2086  * Returns 0 on success.
2087  */
2088 int proc_dointvec(struct ctl_table *table, int write,
2089                      void __user *buffer, size_t *lenp, loff_t *ppos)
2090 {
2091     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2092                             NULL,NULL);
2093 }
2094
2095 /*
2096  * Taint values can only be increased
2097  * This means we can safely use a temporary.
2098  */
2099 static int proc_taint(struct ctl_table *table, int write,
2100                                void __user *buffer, size_t *lenp, loff_t *ppos)
2101 {
2102         struct ctl_table t;
2103         unsigned long tmptaint = get_taint();
2104         int err;
2105
2106         if (write && !capable(CAP_SYS_ADMIN))
2107                 return -EPERM;
2108
2109         t = *table;
2110         t.data = &tmptaint;
2111         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2112         if (err < 0)
2113                 return err;
2114
2115         if (write) {
2116                 /*
2117                  * Poor man's atomic or. Not worth adding a primitive
2118                  * to everyone's atomic.h for this
2119                  */
2120                 int i;
2121                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2122                         if ((tmptaint >> i) & 1)
2123                                 add_taint(i, LOCKDEP_STILL_OK);
2124                 }
2125         }
2126
2127         return err;
2128 }
2129
2130 #ifdef CONFIG_PRINTK
2131 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2132                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2133 {
2134         if (write && !capable(CAP_SYS_ADMIN))
2135                 return -EPERM;
2136
2137         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2138 }
2139 #endif
2140
2141 struct do_proc_dointvec_minmax_conv_param {
2142         int *min;
2143         int *max;
2144 };
2145
2146 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2147                                         int *valp,
2148                                         int write, void *data)
2149 {
2150         struct do_proc_dointvec_minmax_conv_param *param = data;
2151         if (write) {
2152                 int val = *negp ? -*lvalp : *lvalp;
2153                 if ((param->min && *param->min > val) ||
2154                     (param->max && *param->max < val))
2155                         return -EINVAL;
2156                 *valp = val;
2157         } else {
2158                 int val = *valp;
2159                 if (val < 0) {
2160                         *negp = true;
2161                         *lvalp = (unsigned long)-val;
2162                 } else {
2163                         *negp = false;
2164                         *lvalp = (unsigned long)val;
2165                 }
2166         }
2167         return 0;
2168 }
2169
2170 /**
2171  * proc_dointvec_minmax - read a vector of integers with min/max values
2172  * @table: the sysctl table
2173  * @write: %TRUE if this is a write to the sysctl file
2174  * @buffer: the user buffer
2175  * @lenp: the size of the user buffer
2176  * @ppos: file position
2177  *
2178  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2179  * values from/to the user buffer, treated as an ASCII string.
2180  *
2181  * This routine will ensure the values are within the range specified by
2182  * table->extra1 (min) and table->extra2 (max).
2183  *
2184  * Returns 0 on success.
2185  */
2186 int proc_dointvec_minmax(struct ctl_table *table, int write,
2187                   void __user *buffer, size_t *lenp, loff_t *ppos)
2188 {
2189         struct do_proc_dointvec_minmax_conv_param param = {
2190                 .min = (int *) table->extra1,
2191                 .max = (int *) table->extra2,
2192         };
2193         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2194                                 do_proc_dointvec_minmax_conv, &param);
2195 }
2196
2197 static void validate_coredump_safety(void)
2198 {
2199 #ifdef CONFIG_COREDUMP
2200         if (suid_dumpable == SUID_DUMP_ROOT &&
2201             core_pattern[0] != '/' && core_pattern[0] != '|') {
2202                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2203                         "suid_dumpable=2. Pipe handler or fully qualified "\
2204                         "core dump path required.\n");
2205         }
2206 #endif
2207 }
2208
2209 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2210                 void __user *buffer, size_t *lenp, loff_t *ppos)
2211 {
2212         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2213         if (!error)
2214                 validate_coredump_safety();
2215         return error;
2216 }
2217
2218 #ifdef CONFIG_COREDUMP
2219 static int proc_dostring_coredump(struct ctl_table *table, int write,
2220                   void __user *buffer, size_t *lenp, loff_t *ppos)
2221 {
2222         int error = proc_dostring(table, write, buffer, lenp, ppos);
2223         if (!error)
2224                 validate_coredump_safety();
2225         return error;
2226 }
2227 #endif
2228
2229 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2230                                      void __user *buffer,
2231                                      size_t *lenp, loff_t *ppos,
2232                                      unsigned long convmul,
2233                                      unsigned long convdiv)
2234 {
2235         unsigned long *i, *min, *max;
2236         int vleft, first = 1, err = 0;
2237         unsigned long page = 0;
2238         size_t left;
2239         char *kbuf;
2240
2241         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2242                 *lenp = 0;
2243                 return 0;
2244         }
2245
2246         i = (unsigned long *) data;
2247         min = (unsigned long *) table->extra1;
2248         max = (unsigned long *) table->extra2;
2249         vleft = table->maxlen / sizeof(unsigned long);
2250         left = *lenp;
2251
2252         if (write) {
2253                 if (*ppos) {
2254                         switch (sysctl_writes_strict) {
2255                         case SYSCTL_WRITES_STRICT:
2256                                 goto out;
2257                         case SYSCTL_WRITES_WARN:
2258                                 warn_sysctl_write(table);
2259                                 break;
2260                         default:
2261                                 break;
2262                         }
2263                 }
2264
2265                 if (left > PAGE_SIZE - 1)
2266                         left = PAGE_SIZE - 1;
2267                 page = __get_free_page(GFP_TEMPORARY);
2268                 kbuf = (char *) page;
2269                 if (!kbuf)
2270                         return -ENOMEM;
2271                 if (copy_from_user(kbuf, buffer, left)) {
2272                         err = -EFAULT;
2273                         goto free;
2274                 }
2275                 kbuf[left] = 0;
2276         }
2277
2278         for (; left && vleft--; i++, first = 0) {
2279                 unsigned long val;
2280
2281                 if (write) {
2282                         bool neg;
2283
2284                         left -= proc_skip_spaces(&kbuf);
2285
2286                         err = proc_get_long(&kbuf, &left, &val, &neg,
2287                                              proc_wspace_sep,
2288                                              sizeof(proc_wspace_sep), NULL);
2289                         if (err)
2290                                 break;
2291                         if (neg)
2292                                 continue;
2293                         if ((min && val < *min) || (max && val > *max))
2294                                 continue;
2295                         *i = val;
2296                 } else {
2297                         val = convdiv * (*i) / convmul;
2298                         if (!first) {
2299                                 err = proc_put_char(&buffer, &left, '\t');
2300                                 if (err)
2301                                         break;
2302                         }
2303                         err = proc_put_long(&buffer, &left, val, false);
2304                         if (err)
2305                                 break;
2306                 }
2307         }
2308
2309         if (!write && !first && left && !err)
2310                 err = proc_put_char(&buffer, &left, '\n');
2311         if (write && !err)
2312                 left -= proc_skip_spaces(&kbuf);
2313 free:
2314         if (write) {
2315                 free_page(page);
2316                 if (first)
2317                         return err ? : -EINVAL;
2318         }
2319         *lenp -= left;
2320 out:
2321         *ppos += *lenp;
2322         return err;
2323 }
2324
2325 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2326                                      void __user *buffer,
2327                                      size_t *lenp, loff_t *ppos,
2328                                      unsigned long convmul,
2329                                      unsigned long convdiv)
2330 {
2331         return __do_proc_doulongvec_minmax(table->data, table, write,
2332                         buffer, lenp, ppos, convmul, convdiv);
2333 }
2334
2335 /**
2336  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2337  * @table: the sysctl table
2338  * @write: %TRUE if this is a write to the sysctl file
2339  * @buffer: the user buffer
2340  * @lenp: the size of the user buffer
2341  * @ppos: file position
2342  *
2343  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2344  * values from/to the user buffer, treated as an ASCII string.
2345  *
2346  * This routine will ensure the values are within the range specified by
2347  * table->extra1 (min) and table->extra2 (max).
2348  *
2349  * Returns 0 on success.
2350  */
2351 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2352                            void __user *buffer, size_t *lenp, loff_t *ppos)
2353 {
2354     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2355 }
2356
2357 /**
2358  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2359  * @table: the sysctl table
2360  * @write: %TRUE if this is a write to the sysctl file
2361  * @buffer: the user buffer
2362  * @lenp: the size of the user buffer
2363  * @ppos: file position
2364  *
2365  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2366  * values from/to the user buffer, treated as an ASCII string. The values
2367  * are treated as milliseconds, and converted to jiffies when they are stored.
2368  *
2369  * This routine will ensure the values are within the range specified by
2370  * table->extra1 (min) and table->extra2 (max).
2371  *
2372  * Returns 0 on success.
2373  */
2374 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2375                                       void __user *buffer,
2376                                       size_t *lenp, loff_t *ppos)
2377 {
2378     return do_proc_doulongvec_minmax(table, write, buffer,
2379                                      lenp, ppos, HZ, 1000l);
2380 }
2381
2382
2383 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2384                                          int *valp,
2385                                          int write, void *data)
2386 {
2387         if (write) {
2388                 if (*lvalp > LONG_MAX / HZ)
2389                         return 1;
2390                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2391         } else {
2392                 int val = *valp;
2393                 unsigned long lval;
2394                 if (val < 0) {
2395                         *negp = true;
2396                         lval = (unsigned long)-val;
2397                 } else {
2398                         *negp = false;
2399                         lval = (unsigned long)val;
2400                 }
2401                 *lvalp = lval / HZ;
2402         }
2403         return 0;
2404 }
2405
2406 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2407                                                 int *valp,
2408                                                 int write, void *data)
2409 {
2410         if (write) {
2411                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2412                         return 1;
2413                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2414         } else {
2415                 int val = *valp;
2416                 unsigned long lval;
2417                 if (val < 0) {
2418                         *negp = true;
2419                         lval = (unsigned long)-val;
2420                 } else {
2421                         *negp = false;
2422                         lval = (unsigned long)val;
2423                 }
2424                 *lvalp = jiffies_to_clock_t(lval);
2425         }
2426         return 0;
2427 }
2428
2429 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2430                                             int *valp,
2431                                             int write, void *data)
2432 {
2433         if (write) {
2434                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2435
2436                 if (jif > INT_MAX)
2437                         return 1;
2438                 *valp = (int)jif;
2439         } else {
2440                 int val = *valp;
2441                 unsigned long lval;
2442                 if (val < 0) {
2443                         *negp = true;
2444                         lval = (unsigned long)-val;
2445                 } else {
2446                         *negp = false;
2447                         lval = (unsigned long)val;
2448                 }
2449                 *lvalp = jiffies_to_msecs(lval);
2450         }
2451         return 0;
2452 }
2453
2454 /**
2455  * proc_dointvec_jiffies - read a vector of integers as seconds
2456  * @table: the sysctl table
2457  * @write: %TRUE if this is a write to the sysctl file
2458  * @buffer: the user buffer
2459  * @lenp: the size of the user buffer
2460  * @ppos: file position
2461  *
2462  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2463  * values from/to the user buffer, treated as an ASCII string.
2464  * The values read are assumed to be in seconds, and are converted into
2465  * jiffies.
2466  *
2467  * Returns 0 on success.
2468  */
2469 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2470                           void __user *buffer, size_t *lenp, loff_t *ppos)
2471 {
2472     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2473                             do_proc_dointvec_jiffies_conv,NULL);
2474 }
2475
2476 /**
2477  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2478  * @table: the sysctl table
2479  * @write: %TRUE if this is a write to the sysctl file
2480  * @buffer: the user buffer
2481  * @lenp: the size of the user buffer
2482  * @ppos: pointer to the file position
2483  *
2484  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2485  * values from/to the user buffer, treated as an ASCII string.
2486  * The values read are assumed to be in 1/USER_HZ seconds, and
2487  * are converted into jiffies.
2488  *
2489  * Returns 0 on success.
2490  */
2491 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2492                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2493 {
2494     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2495                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2496 }
2497
2498 /**
2499  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2500  * @table: the sysctl table
2501  * @write: %TRUE if this is a write to the sysctl file
2502  * @buffer: the user buffer
2503  * @lenp: the size of the user buffer
2504  * @ppos: file position
2505  * @ppos: the current position in the file
2506  *
2507  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2508  * values from/to the user buffer, treated as an ASCII string.
2509  * The values read are assumed to be in 1/1000 seconds, and
2510  * are converted into jiffies.
2511  *
2512  * Returns 0 on success.
2513  */
2514 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2515                              void __user *buffer, size_t *lenp, loff_t *ppos)
2516 {
2517         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2518                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2519 }
2520
2521 static int proc_do_cad_pid(struct ctl_table *table, int write,
2522                            void __user *buffer, size_t *lenp, loff_t *ppos)
2523 {
2524         struct pid *new_pid;
2525         pid_t tmp;
2526         int r;
2527
2528         tmp = pid_vnr(cad_pid);
2529
2530         r = __do_proc_dointvec(&tmp, table, write, buffer,
2531                                lenp, ppos, NULL, NULL);
2532         if (r || !write)
2533                 return r;
2534
2535         new_pid = find_get_pid(tmp);
2536         if (!new_pid)
2537                 return -ESRCH;
2538
2539         put_pid(xchg(&cad_pid, new_pid));
2540         return 0;
2541 }
2542
2543 /**
2544  * proc_do_large_bitmap - read/write from/to a large bitmap
2545  * @table: the sysctl table
2546  * @write: %TRUE if this is a write to the sysctl file
2547  * @buffer: the user buffer
2548  * @lenp: the size of the user buffer
2549  * @ppos: file position
2550  *
2551  * The bitmap is stored at table->data and the bitmap length (in bits)
2552  * in table->maxlen.
2553  *
2554  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2555  * large bitmaps may be represented in a compact manner. Writing into
2556  * the file will clear the bitmap then update it with the given input.
2557  *
2558  * Returns 0 on success.
2559  */
2560 int proc_do_large_bitmap(struct ctl_table *table, int write,
2561                          void __user *buffer, size_t *lenp, loff_t *ppos)
2562 {
2563         int err = 0;
2564         bool first = 1;
2565         size_t left = *lenp;
2566         unsigned long bitmap_len = table->maxlen;
2567         unsigned long *bitmap = *(unsigned long **) table->data;
2568         unsigned long *tmp_bitmap = NULL;
2569         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2570
2571         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2572                 *lenp = 0;
2573                 return 0;
2574         }
2575
2576         if (write) {
2577                 unsigned long page = 0;
2578                 char *kbuf;
2579
2580                 if (left > PAGE_SIZE - 1)
2581                         left = PAGE_SIZE - 1;
2582
2583                 page = __get_free_page(GFP_TEMPORARY);
2584                 kbuf = (char *) page;
2585                 if (!kbuf)
2586                         return -ENOMEM;
2587                 if (copy_from_user(kbuf, buffer, left)) {
2588                         free_page(page);
2589                         return -EFAULT;
2590                 }
2591                 kbuf[left] = 0;
2592
2593                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2594                                      GFP_KERNEL);
2595                 if (!tmp_bitmap) {
2596                         free_page(page);
2597                         return -ENOMEM;
2598                 }
2599                 proc_skip_char(&kbuf, &left, '\n');
2600                 while (!err && left) {
2601                         unsigned long val_a, val_b;
2602                         bool neg;
2603
2604                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2605                                              sizeof(tr_a), &c);
2606                         if (err)
2607                                 break;
2608                         if (val_a >= bitmap_len || neg) {
2609                                 err = -EINVAL;
2610                                 break;
2611                         }
2612
2613                         val_b = val_a;
2614                         if (left) {
2615                                 kbuf++;
2616                                 left--;
2617                         }
2618
2619                         if (c == '-') {
2620                                 err = proc_get_long(&kbuf, &left, &val_b,
2621                                                      &neg, tr_b, sizeof(tr_b),
2622                                                      &c);
2623                                 if (err)
2624                                         break;
2625                                 if (val_b >= bitmap_len || neg ||
2626                                     val_a > val_b) {
2627                                         err = -EINVAL;
2628                                         break;
2629                                 }
2630                                 if (left) {
2631                                         kbuf++;
2632                                         left--;
2633                                 }
2634                         }
2635
2636                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2637                         first = 0;
2638                         proc_skip_char(&kbuf, &left, '\n');
2639                 }
2640                 free_page(page);
2641         } else {
2642                 unsigned long bit_a, bit_b = 0;
2643
2644                 while (left) {
2645                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2646                         if (bit_a >= bitmap_len)
2647                                 break;
2648                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2649                                                    bit_a + 1) - 1;
2650
2651                         if (!first) {
2652                                 err = proc_put_char(&buffer, &left, ',');
2653                                 if (err)
2654                                         break;
2655                         }
2656                         err = proc_put_long(&buffer, &left, bit_a, false);
2657                         if (err)
2658                                 break;
2659                         if (bit_a != bit_b) {
2660                                 err = proc_put_char(&buffer, &left, '-');
2661                                 if (err)
2662                                         break;
2663                                 err = proc_put_long(&buffer, &left, bit_b, false);
2664                                 if (err)
2665                                         break;
2666                         }
2667
2668                         first = 0; bit_b++;
2669                 }
2670                 if (!err)
2671                         err = proc_put_char(&buffer, &left, '\n');
2672         }
2673
2674         if (!err) {
2675                 if (write) {
2676                         if (*ppos)
2677                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2678                         else
2679                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2680                 }
2681                 kfree(tmp_bitmap);
2682                 *lenp -= left;
2683                 *ppos += *lenp;
2684                 return 0;
2685         } else {
2686                 kfree(tmp_bitmap);
2687                 return err;
2688         }
2689 }
2690
2691 #else /* CONFIG_PROC_SYSCTL */
2692
2693 int proc_dostring(struct ctl_table *table, int write,
2694                   void __user *buffer, size_t *lenp, loff_t *ppos)
2695 {
2696         return -ENOSYS;
2697 }
2698
2699 int proc_dointvec(struct ctl_table *table, int write,
2700                   void __user *buffer, size_t *lenp, loff_t *ppos)
2701 {
2702         return -ENOSYS;
2703 }
2704
2705 int proc_dointvec_minmax(struct ctl_table *table, int write,
2706                     void __user *buffer, size_t *lenp, loff_t *ppos)
2707 {
2708         return -ENOSYS;
2709 }
2710
2711 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2712                     void __user *buffer, size_t *lenp, loff_t *ppos)
2713 {
2714         return -ENOSYS;
2715 }
2716
2717 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2718                     void __user *buffer, size_t *lenp, loff_t *ppos)
2719 {
2720         return -ENOSYS;
2721 }
2722
2723 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2724                              void __user *buffer, size_t *lenp, loff_t *ppos)
2725 {
2726         return -ENOSYS;
2727 }
2728
2729 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2730                     void __user *buffer, size_t *lenp, loff_t *ppos)
2731 {
2732         return -ENOSYS;
2733 }
2734
2735 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2736                                       void __user *buffer,
2737                                       size_t *lenp, loff_t *ppos)
2738 {
2739     return -ENOSYS;
2740 }
2741
2742
2743 #endif /* CONFIG_PROC_SYSCTL */
2744
2745 /*
2746  * No sense putting this after each symbol definition, twice,
2747  * exception granted :-)
2748  */
2749 EXPORT_SYMBOL(proc_dointvec);
2750 EXPORT_SYMBOL(proc_dointvec_jiffies);
2751 EXPORT_SYMBOL(proc_dointvec_minmax);
2752 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2753 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2754 EXPORT_SYMBOL(proc_dostring);
2755 EXPORT_SYMBOL(proc_doulongvec_minmax);
2756 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);