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/aio.h>
  23 #include <linux/mm.h>
  24 #include <linux/swap.h>
  25 #include <linux/slab.h>
  26 #include <linux/sysctl.h>
  27 #include <linux/bitmap.h>
  28 #include <linux/signal.h>
  29 #include <linux/printk.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/security.h>
  32 #include <linux/ctype.h>
  33 #include <linux/kmemcheck.h>
  34 #include <linux/kmemleak.h>
  35 #include <linux/fs.h>
  36 #include <linux/init.h>
  37 #include <linux/kernel.h>
  38 #include <linux/kobject.h>
  39 #include <linux/net.h>
  40 #include <linux/sysrq.h>
  41 #include <linux/highuid.h>
  42 #include <linux/writeback.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/compaction.h>
  45 #include <linux/hugetlb.h>
  46 #include <linux/initrd.h>
  47 #include <linux/key.h>
  48 #include <linux/times.h>
  49 #include <linux/limits.h>
  50 #include <linux/dcache.h>
  51 #include <linux/dnotify.h>
  52 #include <linux/syscalls.h>
  53 #include <linux/vmstat.h>
  54 #include <linux/nfs_fs.h>
  55 #include <linux/acpi.h>
  56 #include <linux/reboot.h>
  57 #include <linux/ftrace.h>
  58 #include <linux/perf_event.h>
  59 #include <linux/kprobes.h>
  60 #include <linux/pipe_fs_i.h>
  61 #include <linux/oom.h>
  62 #include <linux/kmod.h>
  63 #include <linux/capability.h>
  64 #include <linux/binfmts.h>
  65 #include <linux/sched/sysctl.h>
  66 #include <linux/kexec.h>
  67
  68 #include <asm/uaccess.h>
  69 #include <asm/processor.h>
  70
  71 #ifdef CONFIG_X86
  72 #include <asm/nmi.h>
  73 #include <asm/stacktrace.h>
  74 #include <asm/io.h>
  75 #endif
  76 #ifdef CONFIG_SPARC
  77 #include <asm/setup.h>
  78 #endif
  79 #ifdef CONFIG_BSD_PROCESS_ACCT
  80 #include <linux/acct.h>
  81 #endif
  82 #ifdef CONFIG_RT_MUTEXES
  83 #include <linux/rtmutex.h>
  84 #endif
  85 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  86 #include <linux/lockdep.h>
  87 #endif
  88 #ifdef CONFIG_CHR_DEV_SG
  89 #include <scsi/sg.h>
  90 #endif
  91
  92 #ifdef CONFIG_LOCKUP_DETECTOR
  93 #include <linux/nmi.h>
  94 #endif
  95
  96
  97 #if defined(CONFIG_SYSCTL)
  98
  99 /* External variables not in a header file. */
 100 extern int max_threads;
 101 extern int suid_dumpable;
 102 #ifdef CONFIG_COREDUMP
 103 extern int core_uses_pid;
 104 extern char core_pattern[];
 105 extern unsigned int core_pipe_limit;
 106 #endif
 107 extern int pid_max;
 108 extern int pid_max_min, pid_max_max;
 109 extern int percpu_pagelist_fraction;
 110 extern int compat_log;
 111 extern int latencytop_enabled;
 112 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 113 #ifndef CONFIG_MMU
 114 extern int sysctl_nr_trim_pages;
 115 #endif
 116
 117 /* Constants used for minimum and  maximum */
 118 #ifdef CONFIG_LOCKUP_DETECTOR
 119 static int sixty = 60;
 120 #endif
 121
 122 static int __maybe_unused neg_one = -1;
 123
 124 static int zero;
 125 static int __maybe_unused one = 1;
 126 static int __maybe_unused two = 2;
 127 static int __maybe_unused four = 4;
 128 static unsigned long one_ul = 1;
 129 static int one_hundred = 100;
 130 #ifdef CONFIG_PRINTK
 131 static int ten_thousand = 10000;
 132 #endif
 133
 134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 136
 137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 138 static int maxolduid = 65535;
 139 static int minolduid;
 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_minmax,
 392                 .extra1         = &one,
 393         },
 394         {
 395                 .procname       = "numa_balancing",
 396                 .data           = NULL, /* filled in by handler */
 397                 .maxlen         = sizeof(unsigned int),
 398                 .mode           = 0644,
 399                 .proc_handler   = sysctl_numa_balancing,
 400                 .extra1         = &zero,
 401                 .extra2         = &one,
 402         },
 403 #endif /* CONFIG_NUMA_BALANCING */
 404 #endif /* CONFIG_SCHED_DEBUG */
 405         {
 406                 .procname       = "sched_rt_period_us",
 407                 .data           = &sysctl_sched_rt_period,
 408                 .maxlen         = sizeof(unsigned int),
 409                 .mode           = 0644,
 410                 .proc_handler   = sched_rt_handler,
 411         },
 412         {
 413                 .procname       = "sched_rt_runtime_us",
 414                 .data           = &sysctl_sched_rt_runtime,
 415                 .maxlen         = sizeof(int),
 416                 .mode           = 0644,
 417                 .proc_handler   = sched_rt_handler,
 418         },
 419         {
 420                 .procname       = "sched_rr_timeslice_ms",
 421                 .data           = &sched_rr_timeslice,
 422                 .maxlen         = sizeof(int),
 423                 .mode           = 0644,
 424                 .proc_handler   = sched_rr_handler,
 425         },
 426 #ifdef CONFIG_SCHED_AUTOGROUP
 427         {
 428                 .procname       = "sched_autogroup_enabled",
 429                 .data           = &sysctl_sched_autogroup_enabled,
 430                 .maxlen         = sizeof(unsigned int),
 431                 .mode           = 0644,
 432                 .proc_handler   = proc_dointvec_minmax,
 433                 .extra1         = &zero,
 434                 .extra2         = &one,
 435         },
 436 #endif
 437 #ifdef CONFIG_CFS_BANDWIDTH
 438         {
 439                 .procname       = "sched_cfs_bandwidth_slice_us",
 440                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 441                 .maxlen         = sizeof(unsigned int),
 442                 .mode           = 0644,
 443                 .proc_handler   = proc_dointvec_minmax,
 444                 .extra1         = &one,
 445         },
 446 #endif
 447 #ifdef CONFIG_PROVE_LOCKING
 448         {
 449                 .procname       = "prove_locking",
 450                 .data           = &prove_locking,
 451                 .maxlen         = sizeof(int),
 452                 .mode           = 0644,
 453                 .proc_handler   = proc_dointvec,
 454         },
 455 #endif
 456 #ifdef CONFIG_LOCK_STAT
 457         {
 458                 .procname       = "lock_stat",
 459                 .data           = &lock_stat,
 460                 .maxlen         = sizeof(int),
 461                 .mode           = 0644,
 462                 .proc_handler   = proc_dointvec,
 463         },
 464 #endif
 465         {
 466                 .procname       = "panic",
 467                 .data           = &panic_timeout,
 468                 .maxlen         = sizeof(int),
 469                 .mode           = 0644,
 470                 .proc_handler   = proc_dointvec,
 471         },
 472 #ifdef CONFIG_COREDUMP
 473         {
 474                 .procname       = "core_uses_pid",
 475                 .data           = &core_uses_pid,
 476                 .maxlen         = sizeof(int),
 477                 .mode           = 0644,
 478                 .proc_handler   = proc_dointvec,
 479         },
 480         {
 481                 .procname       = "core_pattern",
 482                 .data           = core_pattern,
 483                 .maxlen         = CORENAME_MAX_SIZE,
 484                 .mode           = 0644,
 485                 .proc_handler   = proc_dostring_coredump,
 486         },
 487         {
 488                 .procname       = "core_pipe_limit",
 489                 .data           = &core_pipe_limit,
 490                 .maxlen         = sizeof(unsigned int),
 491                 .mode           = 0644,
 492                 .proc_handler   = proc_dointvec,
 493         },
 494 #endif
 495 #ifdef CONFIG_PROC_SYSCTL
 496         {
 497                 .procname       = "tainted",
 498                 .maxlen         = sizeof(long),
 499                 .mode           = 0644,
 500                 .proc_handler   = proc_taint,
 501         },
 502         {
 503                 .procname       = "sysctl_writes_strict",
 504                 .data           = &sysctl_writes_strict,
 505                 .maxlen         = sizeof(int),
 506                 .mode           = 0644,
 507                 .proc_handler   = proc_dointvec_minmax,
 508                 .extra1         = &neg_one,
 509                 .extra2         = &one,
 510         },
 511 #endif
 512 #ifdef CONFIG_LATENCYTOP
 513         {
 514                 .procname       = "latencytop",
 515                 .data           = &latencytop_enabled,
 516                 .maxlen         = sizeof(int),
 517                 .mode           = 0644,
 518                 .proc_handler   = proc_dointvec,
 519         },
 520 #endif
 521 #ifdef CONFIG_BLK_DEV_INITRD
 522         {
 523                 .procname       = "real-root-dev",
 524                 .data           = &real_root_dev,
 525                 .maxlen         = sizeof(int),
 526                 .mode           = 0644,
 527                 .proc_handler   = proc_dointvec,
 528         },
 529 #endif
 530         {
 531                 .procname       = "print-fatal-signals",
 532                 .data           = &print_fatal_signals,
 533                 .maxlen         = sizeof(int),
 534                 .mode           = 0644,
 535                 .proc_handler   = proc_dointvec,
 536         },
 537 #ifdef CONFIG_SPARC
 538         {
 539                 .procname       = "reboot-cmd",
 540                 .data           = reboot_command,
 541                 .maxlen         = 256,
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_dostring,
 544         },
 545         {
 546                 .procname       = "stop-a",
 547                 .data           = &stop_a_enabled,
 548                 .maxlen         = sizeof (int),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_dointvec,
 551         },
 552         {
 553                 .procname       = "scons-poweroff",
 554                 .data           = &scons_pwroff,
 555                 .maxlen         = sizeof (int),
 556                 .mode           = 0644,
 557                 .proc_handler   = proc_dointvec,
 558         },
 559 #endif
 560 #ifdef CONFIG_SPARC64
 561         {
 562                 .procname       = "tsb-ratio",
 563                 .data           = &sysctl_tsb_ratio,
 564                 .maxlen         = sizeof (int),
 565                 .mode           = 0644,
 566                 .proc_handler   = proc_dointvec,
 567         },
 568 #endif
 569 #ifdef __hppa__
 570         {
 571                 .procname       = "soft-power",
 572                 .data           = &pwrsw_enabled,
 573                 .maxlen         = sizeof (int),
 574                 .mode           = 0644,
 575                 .proc_handler   = proc_dointvec,
 576         },
 577 #endif
 578 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 579         {
 580                 .procname       = "unaligned-trap",
 581                 .data           = &unaligned_enabled,
 582                 .maxlen         = sizeof (int),
 583                 .mode           = 0644,
 584                 .proc_handler   = proc_dointvec,
 585         },
 586 #endif
 587         {
 588                 .procname       = "ctrl-alt-del",
 589                 .data           = &C_A_D,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = proc_dointvec,
 593         },
 594 #ifdef CONFIG_FUNCTION_TRACER
 595         {
 596                 .procname       = "ftrace_enabled",
 597                 .data           = &ftrace_enabled,
 598                 .maxlen         = sizeof(int),
 599                 .mode           = 0644,
 600                 .proc_handler   = ftrace_enable_sysctl,
 601         },
 602 #endif
 603 #ifdef CONFIG_STACK_TRACER
 604         {
 605                 .procname       = "stack_tracer_enabled",
 606                 .data           = &stack_tracer_enabled,
 607                 .maxlen         = sizeof(int),
 608                 .mode           = 0644,
 609                 .proc_handler   = stack_trace_sysctl,
 610         },
 611 #endif
 612 #ifdef CONFIG_TRACING
 613         {
 614                 .procname       = "ftrace_dump_on_oops",
 615                 .data           = &ftrace_dump_on_oops,
 616                 .maxlen         = sizeof(int),
 617                 .mode           = 0644,
 618                 .proc_handler   = proc_dointvec,
 619         },
 620         {
 621                 .procname       = "traceoff_on_warning",
 622                 .data           = &__disable_trace_on_warning,
 623                 .maxlen         = sizeof(__disable_trace_on_warning),
 624                 .mode           = 0644,
 625                 .proc_handler   = proc_dointvec,
 626         },
 627         {
 628                 .procname       = "tracepoint_printk",
 629                 .data           = &tracepoint_printk,
 630                 .maxlen         = sizeof(tracepoint_printk),
 631                 .mode           = 0644,
 632                 .proc_handler   = proc_dointvec,
 633         },
 634 #endif
 635 #ifdef CONFIG_KEXEC
 636         {
 637                 .procname       = "kexec_load_disabled",
 638                 .data           = &kexec_load_disabled,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 /* only handle a transition from default "0" to "1" */
 642                 .proc_handler   = proc_dointvec_minmax,
 643                 .extra1         = &one,
 644                 .extra2         = &one,
 645         },
 646 #endif
 647 #ifdef CONFIG_MODULES
 648         {
 649                 .procname       = "modprobe",
 650                 .data           = &modprobe_path,
 651                 .maxlen         = KMOD_PATH_LEN,
 652                 .mode           = 0644,
 653                 .proc_handler   = proc_dostring,
 654         },
 655         {
 656                 .procname       = "modules_disabled",
 657                 .data           = &modules_disabled,
 658                 .maxlen         = sizeof(int),
 659                 .mode           = 0644,
 660                 /* only handle a transition from default "0" to "1" */
 661                 .proc_handler   = proc_dointvec_minmax,
 662                 .extra1         = &one,
 663                 .extra2         = &one,
 664         },
 665 #endif
 666 #ifdef CONFIG_UEVENT_HELPER
 667         {
 668                 .procname       = "hotplug",
 669                 .data           = &uevent_helper,
 670                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 671                 .mode           = 0644,
 672                 .proc_handler   = proc_dostring,
 673         },
 674 #endif
 675 #ifdef CONFIG_CHR_DEV_SG
 676         {
 677                 .procname       = "sg-big-buff",
 678                 .data           = &sg_big_buff,
 679                 .maxlen         = sizeof (int),
 680                 .mode           = 0444,
 681                 .proc_handler   = proc_dointvec,
 682         },
 683 #endif
 684 #ifdef CONFIG_BSD_PROCESS_ACCT
 685         {
 686                 .procname       = "acct",
 687                 .data           = &acct_parm,
 688                 .maxlen         = 3*sizeof(int),
 689                 .mode           = 0644,
 690                 .proc_handler   = proc_dointvec,
 691         },
 692 #endif
 693 #ifdef CONFIG_MAGIC_SYSRQ
 694         {
 695                 .procname       = "sysrq",
 696                 .data           = &__sysrq_enabled,
 697                 .maxlen         = sizeof (int),
 698                 .mode           = 0644,
 699                 .proc_handler   = sysrq_sysctl_handler,
 700         },
 701 #endif
 702 #ifdef CONFIG_PROC_SYSCTL
 703         {
 704                 .procname       = "cad_pid",
 705                 .data           = NULL,
 706                 .maxlen         = sizeof (int),
 707                 .mode           = 0600,
 708                 .proc_handler   = proc_do_cad_pid,
 709         },
 710 #endif
 711         {
 712                 .procname       = "threads-max",
 713                 .data           = &max_threads,
 714                 .maxlen         = sizeof(int),
 715                 .mode           = 0644,
 716                 .proc_handler   = proc_dointvec,
 717         },
 718         {
 719                 .procname       = "random",
 720                 .mode           = 0555,
 721                 .child          = random_table,
 722         },
 723         {
 724                 .procname       = "usermodehelper",
 725                 .mode           = 0555,
 726                 .child          = usermodehelper_table,
 727         },
 728         {
 729                 .procname       = "overflowuid",
 730                 .data           = &overflowuid,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_dointvec_minmax,
 734                 .extra1         = &minolduid,
 735                 .extra2         = &maxolduid,
 736         },
 737         {
 738                 .procname       = "overflowgid",
 739                 .data           = &overflowgid,
 740                 .maxlen         = sizeof(int),
 741                 .mode           = 0644,
 742                 .proc_handler   = proc_dointvec_minmax,
 743                 .extra1         = &minolduid,
 744                 .extra2         = &maxolduid,
 745         },
 746 #ifdef CONFIG_S390
 747 #ifdef CONFIG_MATHEMU
 748         {
 749                 .procname       = "ieee_emulation_warnings",
 750                 .data           = &sysctl_ieee_emulation_warnings,
 751                 .maxlen         = sizeof(int),
 752                 .mode           = 0644,
 753                 .proc_handler   = proc_dointvec,
 754         },
 755 #endif
 756         {
 757                 .procname       = "userprocess_debug",
 758                 .data           = &show_unhandled_signals,
 759                 .maxlen         = sizeof(int),
 760                 .mode           = 0644,
 761                 .proc_handler   = proc_dointvec,
 762         },
 763 #endif
 764         {
 765                 .procname       = "pid_max",
 766                 .data           = &pid_max,
 767                 .maxlen         = sizeof (int),
 768                 .mode           = 0644,
 769                 .proc_handler   = proc_dointvec_minmax,
 770                 .extra1         = &pid_max_min,
 771                 .extra2         = &pid_max_max,
 772         },
 773         {
 774                 .procname       = "panic_on_oops",
 775                 .data           = &panic_on_oops,
 776                 .maxlen         = sizeof(int),
 777                 .mode           = 0644,
 778                 .proc_handler   = proc_dointvec,
 779         },
 780 #if defined CONFIG_PRINTK
 781         {
 782                 .procname       = "printk",
 783                 .data           = &console_loglevel,
 784                 .maxlen         = 4*sizeof(int),
 785                 .mode           = 0644,
 786                 .proc_handler   = proc_dointvec,
 787         },
 788         {
 789                 .procname       = "printk_ratelimit",
 790                 .data           = &printk_ratelimit_state.interval,
 791                 .maxlen         = sizeof(int),
 792                 .mode           = 0644,
 793                 .proc_handler   = proc_dointvec_jiffies,
 794         },
 795         {
 796                 .procname       = "printk_ratelimit_burst",
 797                 .data           = &printk_ratelimit_state.burst,
 798                 .maxlen         = sizeof(int),
 799                 .mode           = 0644,
 800                 .proc_handler   = proc_dointvec,
 801         },
 802         {
 803                 .procname       = "printk_delay",
 804                 .data           = &printk_delay_msec,
 805                 .maxlen         = sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = proc_dointvec_minmax,
 808                 .extra1         = &zero,
 809                 .extra2         = &ten_thousand,
 810         },
 811         {
 812                 .procname       = "dmesg_restrict",
 813                 .data           = &dmesg_restrict,
 814                 .maxlen         = sizeof(int),
 815                 .mode           = 0644,
 816                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 817                 .extra1         = &zero,
 818                 .extra2         = &one,
 819         },
 820         {
 821                 .procname       = "kptr_restrict",
 822                 .data           = &kptr_restrict,
 823                 .maxlen         = sizeof(int),
 824                 .mode           = 0644,
 825                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 826                 .extra1         = &zero,
 827                 .extra2         = &two,
 828         },
 829 #endif
 830         {
 831                 .procname       = "ngroups_max",
 832                 .data           = &ngroups_max,
 833                 .maxlen         = sizeof (int),
 834                 .mode           = 0444,
 835                 .proc_handler   = proc_dointvec,
 836         },
 837         {
 838                 .procname       = "cap_last_cap",
 839                 .data           = (void *)&cap_last_cap,
 840                 .maxlen         = sizeof(int),
 841                 .mode           = 0444,
 842                 .proc_handler   = proc_dointvec,
 843         },
 844 #if defined(CONFIG_LOCKUP_DETECTOR)
 845         {
 846                 .procname       = "watchdog",
 847                 .data           = &watchdog_user_enabled,
 848                 .maxlen         = sizeof (int),
 849                 .mode           = 0644,
 850                 .proc_handler   = proc_watchdog,
 851                 .extra1         = &zero,
 852                 .extra2         = &one,
 853         },
 854         {
 855                 .procname       = "watchdog_thresh",
 856                 .data           = &watchdog_thresh,
 857                 .maxlen         = sizeof(int),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_watchdog_thresh,
 860                 .extra1         = &zero,
 861                 .extra2         = &sixty,
 862         },
 863         {
 864                 .procname       = "nmi_watchdog",
 865                 .data           = &nmi_watchdog_enabled,
 866                 .maxlen         = sizeof (int),
 867                 .mode           = 0644,
 868                 .proc_handler   = proc_nmi_watchdog,
 869                 .extra1         = &zero,
 870 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
 871                 .extra2         = &one,
 872 #else
 873                 .extra2         = &zero,
 874 #endif
 875         },
 876         {
 877                 .procname       = "soft_watchdog",
 878                 .data           = &soft_watchdog_enabled,
 879                 .maxlen         = sizeof (int),
 880                 .mode           = 0644,
 881                 .proc_handler   = proc_soft_watchdog,
 882                 .extra1         = &zero,
 883                 .extra2         = &one,
 884         },
 885         {
 886                 .procname       = "softlockup_panic",
 887                 .data           = &softlockup_panic,
 888                 .maxlen         = sizeof(int),
 889                 .mode           = 0644,
 890                 .proc_handler   = proc_dointvec_minmax,
 891                 .extra1         = &zero,
 892                 .extra2         = &one,
 893         },
 894 #ifdef CONFIG_SMP
 895         {
 896                 .procname       = "softlockup_all_cpu_backtrace",
 897                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 898                 .maxlen         = sizeof(int),
 899                 .mode           = 0644,
 900                 .proc_handler   = proc_dointvec_minmax,
 901                 .extra1         = &zero,
 902                 .extra2         = &one,
 903         },
 904 #endif /* CONFIG_SMP */
 905 #endif
 906 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 907         {
 908                 .procname       = "unknown_nmi_panic",
 909                 .data           = &unknown_nmi_panic,
 910                 .maxlen         = sizeof (int),
 911                 .mode           = 0644,
 912                 .proc_handler   = proc_dointvec,
 913         },
 914 #endif
 915 #if defined(CONFIG_X86)
 916         {
 917                 .procname       = "panic_on_unrecovered_nmi",
 918                 .data           = &panic_on_unrecovered_nmi,
 919                 .maxlen         = sizeof(int),
 920                 .mode           = 0644,
 921                 .proc_handler   = proc_dointvec,
 922         },
 923         {
 924                 .procname       = "panic_on_io_nmi",
 925                 .data           = &panic_on_io_nmi,
 926                 .maxlen         = sizeof(int),
 927                 .mode           = 0644,
 928                 .proc_handler   = proc_dointvec,
 929         },
 930 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 931         {
 932                 .procname       = "panic_on_stackoverflow",
 933                 .data           = &sysctl_panic_on_stackoverflow,
 934                 .maxlen         = sizeof(int),
 935                 .mode           = 0644,
 936                 .proc_handler   = proc_dointvec,
 937         },
 938 #endif
 939         {
 940                 .procname       = "bootloader_type",
 941                 .data           = &bootloader_type,
 942                 .maxlen         = sizeof (int),
 943                 .mode           = 0444,
 944                 .proc_handler   = proc_dointvec,
 945         },
 946         {
 947                 .procname       = "bootloader_version",
 948                 .data           = &bootloader_version,
 949                 .maxlen         = sizeof (int),
 950                 .mode           = 0444,
 951                 .proc_handler   = proc_dointvec,
 952         },
 953         {
 954                 .procname       = "kstack_depth_to_print",
 955                 .data           = &kstack_depth_to_print,
 956                 .maxlen         = sizeof(int),
 957                 .mode           = 0644,
 958                 .proc_handler   = proc_dointvec,
 959         },
 960         {
 961                 .procname       = "io_delay_type",
 962                 .data           = &io_delay_type,
 963                 .maxlen         = sizeof(int),
 964                 .mode           = 0644,
 965                 .proc_handler   = proc_dointvec,
 966         },
 967 #endif
 968 #if defined(CONFIG_MMU)
 969         {
 970                 .procname       = "randomize_va_space",
 971                 .data           = &randomize_va_space,
 972                 .maxlen         = sizeof(int),
 973                 .mode           = 0644,
 974                 .proc_handler   = proc_dointvec,
 975         },
 976 #endif
 977 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 978         {
 979                 .procname       = "spin_retry",
 980                 .data           = &spin_retry,
 981                 .maxlen         = sizeof (int),
 982                 .mode           = 0644,
 983                 .proc_handler   = proc_dointvec,
 984         },
 985 #endif
 986 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 987         {
 988                 .procname       = "acpi_video_flags",
 989                 .data           = &acpi_realmode_flags,
 990                 .maxlen         = sizeof (unsigned long),
 991                 .mode           = 0644,
 992                 .proc_handler   = proc_doulongvec_minmax,
 993         },
 994 #endif
 995 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 996         {
 997                 .procname       = "ignore-unaligned-usertrap",
 998                 .data           = &no_unaligned_warning,
 999                 .maxlen         = sizeof (int),
1000                 .mode           = 0644,
1001                 .proc_handler   = proc_dointvec,
1002         },
1003 #endif
1004 #ifdef CONFIG_IA64
1005         {
1006                 .procname       = "unaligned-dump-stack",
1007                 .data           = &unaligned_dump_stack,
1008                 .maxlen         = sizeof (int),
1009                 .mode           = 0644,
1010                 .proc_handler   = proc_dointvec,
1011         },
1012 #endif
1013 #ifdef CONFIG_DETECT_HUNG_TASK
1014         {
1015                 .procname       = "hung_task_panic",
1016                 .data           = &sysctl_hung_task_panic,
1017                 .maxlen         = sizeof(int),
1018                 .mode           = 0644,
1019                 .proc_handler   = proc_dointvec_minmax,
1020                 .extra1         = &zero,
1021                 .extra2         = &one,
1022         },
1023         {
1024                 .procname       = "hung_task_check_count",
1025                 .data           = &sysctl_hung_task_check_count,
1026                 .maxlen         = sizeof(int),
1027                 .mode           = 0644,
1028                 .proc_handler   = proc_dointvec_minmax,
1029                 .extra1         = &zero,
1030         },
1031         {
1032                 .procname       = "hung_task_timeout_secs",
1033                 .data           = &sysctl_hung_task_timeout_secs,
1034                 .maxlen         = sizeof(unsigned long),
1035                 .mode           = 0644,
1036                 .proc_handler   = proc_dohung_task_timeout_secs,
1037                 .extra2         = &hung_task_timeout_max,
1038         },
1039         {
1040                 .procname       = "hung_task_warnings",
1041                 .data           = &sysctl_hung_task_warnings,
1042                 .maxlen         = sizeof(int),
1043                 .mode           = 0644,
1044                 .proc_handler   = proc_dointvec_minmax,
1045                 .extra1         = &neg_one,
1046         },
1047 #endif
1048 #ifdef CONFIG_COMPAT
1049         {
1050                 .procname       = "compat-log",
1051                 .data           = &compat_log,
1052                 .maxlen         = sizeof (int),
1053                 .mode           = 0644,
1054                 .proc_handler   = proc_dointvec,
1055         },
1056 #endif
1057 #ifdef CONFIG_RT_MUTEXES
1058         {
1059                 .procname       = "max_lock_depth",
1060                 .data           = &max_lock_depth,
1061                 .maxlen         = sizeof(int),
1062                 .mode           = 0644,
1063                 .proc_handler   = proc_dointvec,
1064         },
1065 #endif
1066         {
1067                 .procname       = "poweroff_cmd",
1068                 .data           = &poweroff_cmd,
1069                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1070                 .mode           = 0644,
1071                 .proc_handler   = proc_dostring,
1072         },
1073 #ifdef CONFIG_KEYS
1074         {
1075                 .procname       = "keys",
1076                 .mode           = 0555,
1077                 .child          = key_sysctls,
1078         },
1079 #endif
1080 #ifdef CONFIG_PERF_EVENTS
1081         /*
1082          * User-space scripts rely on the existence of this file
1083          * as a feature check for perf_events being enabled.
1084          *
1085          * So it's an ABI, do not remove!
1086          */
1087         {
1088                 .procname       = "perf_event_paranoid",
1089                 .data           = &sysctl_perf_event_paranoid,
1090                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1091                 .mode           = 0644,
1092                 .proc_handler   = proc_dointvec,
1093         },
1094         {
1095                 .procname       = "perf_event_mlock_kb",
1096                 .data           = &sysctl_perf_event_mlock,
1097                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1098                 .mode           = 0644,
1099                 .proc_handler   = proc_dointvec,
1100         },
1101         {
1102                 .procname       = "perf_event_max_sample_rate",
1103                 .data           = &sysctl_perf_event_sample_rate,
1104                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1105                 .mode           = 0644,
1106                 .proc_handler   = perf_proc_update_handler,
1107                 .extra1         = &one,
1108         },
1109         {
1110                 .procname       = "perf_cpu_time_max_percent",
1111                 .data           = &sysctl_perf_cpu_time_max_percent,
1112                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1113                 .mode           = 0644,
1114                 .proc_handler   = perf_cpu_time_max_percent_handler,
1115                 .extra1         = &zero,
1116                 .extra2         = &one_hundred,
1117         },
1118 #endif
1119 #ifdef CONFIG_KMEMCHECK
1120         {
1121                 .procname       = "kmemcheck",
1122                 .data           = &kmemcheck_enabled,
1123                 .maxlen         = sizeof(int),
1124                 .mode           = 0644,
1125                 .proc_handler   = proc_dointvec,
1126         },
1127 #endif
1128         {
1129                 .procname       = "panic_on_warn",
1130                 .data           = &panic_on_warn,
1131                 .maxlen         = sizeof(int),
1132                 .mode           = 0644,
1133                 .proc_handler   = proc_dointvec_minmax,
1134                 .extra1         = &zero,
1135                 .extra2         = &one,
1136         },
1137         { }
1138 };
1139
1140 static struct ctl_table vm_table[] = {
1141         {
1142                 .procname       = "overcommit_memory",
1143                 .data           = &sysctl_overcommit_memory,
1144                 .maxlen         = sizeof(sysctl_overcommit_memory),
1145                 .mode           = 0644,
1146                 .proc_handler   = proc_dointvec_minmax,
1147                 .extra1         = &zero,
1148                 .extra2         = &two,
1149         },
1150         {
1151                 .procname       = "panic_on_oom",
1152                 .data           = &sysctl_panic_on_oom,
1153                 .maxlen         = sizeof(sysctl_panic_on_oom),
1154                 .mode           = 0644,
1155                 .proc_handler   = proc_dointvec_minmax,
1156                 .extra1         = &zero,
1157                 .extra2         = &two,
1158         },
1159         {
1160                 .procname       = "oom_kill_allocating_task",
1161                 .data           = &sysctl_oom_kill_allocating_task,
1162                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1163                 .mode           = 0644,
1164                 .proc_handler   = proc_dointvec,
1165         },
1166         {
1167                 .procname       = "oom_dump_tasks",
1168                 .data           = &sysctl_oom_dump_tasks,
1169                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1170                 .mode           = 0644,
1171                 .proc_handler   = proc_dointvec,
1172         },
1173         {
1174                 .procname       = "overcommit_ratio",
1175                 .data           = &sysctl_overcommit_ratio,
1176                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1177                 .mode           = 0644,
1178                 .proc_handler   = overcommit_ratio_handler,
1179         },
1180         {
1181                 .procname       = "overcommit_kbytes",
1182                 .data           = &sysctl_overcommit_kbytes,
1183                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1184                 .mode           = 0644,
1185                 .proc_handler   = overcommit_kbytes_handler,
1186         },
1187         {
1188                 .procname       = "page-cluster",
1189                 .data           = &page_cluster,
1190                 .maxlen         = sizeof(int),
1191                 .mode           = 0644,
1192                 .proc_handler   = proc_dointvec_minmax,
1193                 .extra1         = &zero,
1194         },
1195         {
1196                 .procname       = "dirty_background_ratio",
1197                 .data           = &dirty_background_ratio,
1198                 .maxlen         = sizeof(dirty_background_ratio),
1199                 .mode           = 0644,
1200                 .proc_handler   = dirty_background_ratio_handler,
1201                 .extra1         = &zero,
1202                 .extra2         = &one_hundred,
1203         },
1204         {
1205                 .procname       = "dirty_background_bytes",
1206                 .data           = &dirty_background_bytes,
1207                 .maxlen         = sizeof(dirty_background_bytes),
1208                 .mode           = 0644,
1209                 .proc_handler   = dirty_background_bytes_handler,
1210                 .extra1         = &one_ul,
1211         },
1212         {
1213                 .procname       = "dirty_ratio",
1214                 .data           = &vm_dirty_ratio,
1215                 .maxlen         = sizeof(vm_dirty_ratio),
1216                 .mode           = 0644,
1217                 .proc_handler   = dirty_ratio_handler,
1218                 .extra1         = &zero,
1219                 .extra2         = &one_hundred,
1220         },
1221         {
1222                 .procname       = "dirty_bytes",
1223                 .data           = &vm_dirty_bytes,
1224                 .maxlen         = sizeof(vm_dirty_bytes),
1225                 .mode           = 0644,
1226                 .proc_handler   = dirty_bytes_handler,
1227                 .extra1         = &dirty_bytes_min,
1228         },
1229         {
1230                 .procname       = "dirty_writeback_centisecs",
1231                 .data           = &dirty_writeback_interval,
1232                 .maxlen         = sizeof(dirty_writeback_interval),
1233                 .mode           = 0644,
1234                 .proc_handler   = dirty_writeback_centisecs_handler,
1235         },
1236         {
1237                 .procname       = "dirty_expire_centisecs",
1238                 .data           = &dirty_expire_interval,
1239                 .maxlen         = sizeof(dirty_expire_interval),
1240                 .mode           = 0644,
1241                 .proc_handler   = proc_dointvec_minmax,
1242                 .extra1         = &zero,
1243         },
1244         {
1245                 .procname       = "dirtytime_expire_seconds",
1246                 .data           = &dirtytime_expire_interval,
1247                 .maxlen         = sizeof(dirty_expire_interval),
1248                 .mode           = 0644,
1249                 .proc_handler   = dirtytime_interval_handler,
1250                 .extra1         = &zero,
1251         },
1252         {
1253                 .procname       = "nr_pdflush_threads",
1254                 .mode           = 0444 /* read-only */,
1255                 .proc_handler   = pdflush_proc_obsolete,
1256         },
1257         {
1258                 .procname       = "swappiness",
1259                 .data           = &vm_swappiness,
1260                 .maxlen         = sizeof(vm_swappiness),
1261                 .mode           = 0644,
1262                 .proc_handler   = proc_dointvec_minmax,
1263                 .extra1         = &zero,
1264                 .extra2         = &one_hundred,
1265         },
1266 #ifdef CONFIG_HUGETLB_PAGE
1267         {
1268                 .procname       = "nr_hugepages",
1269                 .data           = NULL,
1270                 .maxlen         = sizeof(unsigned long),
1271                 .mode           = 0644,
1272                 .proc_handler   = hugetlb_sysctl_handler,
1273         },
1274 #ifdef CONFIG_NUMA
1275         {
1276                 .procname       = "nr_hugepages_mempolicy",
1277                 .data           = NULL,
1278                 .maxlen         = sizeof(unsigned long),
1279                 .mode           = 0644,
1280                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1281         },
1282 #endif
1283          {
1284                 .procname       = "hugetlb_shm_group",
1285                 .data           = &sysctl_hugetlb_shm_group,
1286                 .maxlen         = sizeof(gid_t),
1287                 .mode           = 0644,
1288                 .proc_handler   = proc_dointvec,
1289          },
1290          {
1291                 .procname       = "hugepages_treat_as_movable",
1292                 .data           = &hugepages_treat_as_movable,
1293                 .maxlen         = sizeof(int),
1294                 .mode           = 0644,
1295                 .proc_handler   = proc_dointvec,
1296         },
1297         {
1298                 .procname       = "nr_overcommit_hugepages",
1299                 .data           = NULL,
1300                 .maxlen         = sizeof(unsigned long),
1301                 .mode           = 0644,
1302                 .proc_handler   = hugetlb_overcommit_handler,
1303         },
1304 #endif
1305         {
1306                 .procname       = "lowmem_reserve_ratio",
1307                 .data           = &sysctl_lowmem_reserve_ratio,
1308                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1309                 .mode           = 0644,
1310                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1311         },
1312         {
1313                 .procname       = "drop_caches",
1314                 .data           = &sysctl_drop_caches,
1315                 .maxlen         = sizeof(int),
1316                 .mode           = 0644,
1317                 .proc_handler   = drop_caches_sysctl_handler,
1318                 .extra1         = &one,
1319                 .extra2         = &four,
1320         },
1321 #ifdef CONFIG_COMPACTION
1322         {
1323                 .procname       = "compact_memory",
1324                 .data           = &sysctl_compact_memory,
1325                 .maxlen         = sizeof(int),
1326                 .mode           = 0200,
1327                 .proc_handler   = sysctl_compaction_handler,
1328         },
1329         {
1330                 .procname       = "extfrag_threshold",
1331                 .data           = &sysctl_extfrag_threshold,
1332                 .maxlen         = sizeof(int),
1333                 .mode           = 0644,
1334                 .proc_handler   = sysctl_extfrag_handler,
1335                 .extra1         = &min_extfrag_threshold,
1336                 .extra2         = &max_extfrag_threshold,
1337         },
1338         {
1339                 .procname       = "compact_unevictable_allowed",
1340                 .data           = &sysctl_compact_unevictable_allowed,
1341                 .maxlen         = sizeof(int),
1342                 .mode           = 0644,
1343                 .proc_handler   = proc_dointvec,
1344                 .extra1         = &zero,
1345                 .extra2         = &one,
1346         },
1347
1348 #endif /* CONFIG_COMPACTION */
1349         {
1350                 .procname       = "min_free_kbytes",
1351                 .data           = &min_free_kbytes,
1352                 .maxlen         = sizeof(min_free_kbytes),
1353                 .mode           = 0644,
1354                 .proc_handler   = min_free_kbytes_sysctl_handler,
1355                 .extra1         = &zero,
1356         },
1357         {
1358                 .procname       = "percpu_pagelist_fraction",
1359                 .data           = &percpu_pagelist_fraction,
1360                 .maxlen         = sizeof(percpu_pagelist_fraction),
1361                 .mode           = 0644,
1362                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1363                 .extra1         = &zero,
1364         },
1365 #ifdef CONFIG_MMU
1366         {
1367                 .procname       = "max_map_count",
1368                 .data           = &sysctl_max_map_count,
1369                 .maxlen         = sizeof(sysctl_max_map_count),
1370                 .mode           = 0644,
1371                 .proc_handler   = proc_dointvec_minmax,
1372                 .extra1         = &zero,
1373         },
1374 #else
1375         {
1376                 .procname       = "nr_trim_pages",
1377                 .data           = &sysctl_nr_trim_pages,
1378                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1379                 .mode           = 0644,
1380                 .proc_handler   = proc_dointvec_minmax,
1381                 .extra1         = &zero,
1382         },
1383 #endif
1384         {
1385                 .procname       = "laptop_mode",
1386                 .data           = &laptop_mode,
1387                 .maxlen         = sizeof(laptop_mode),
1388                 .mode           = 0644,
1389                 .proc_handler   = proc_dointvec_jiffies,
1390         },
1391         {
1392                 .procname       = "block_dump",
1393                 .data           = &block_dump,
1394                 .maxlen         = sizeof(block_dump),
1395                 .mode           = 0644,
1396                 .proc_handler   = proc_dointvec,
1397                 .extra1         = &zero,
1398         },
1399         {
1400                 .procname       = "vfs_cache_pressure",
1401                 .data           = &sysctl_vfs_cache_pressure,
1402                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1403                 .mode           = 0644,
1404                 .proc_handler   = proc_dointvec,
1405                 .extra1         = &zero,
1406         },
1407 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1408         {
1409                 .procname       = "legacy_va_layout",
1410                 .data           = &sysctl_legacy_va_layout,
1411                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1412                 .mode           = 0644,
1413                 .proc_handler   = proc_dointvec,
1414                 .extra1         = &zero,
1415         },
1416 #endif
1417 #ifdef CONFIG_NUMA
1418         {
1419                 .procname       = "zone_reclaim_mode",
1420                 .data           = &zone_reclaim_mode,
1421                 .maxlen         = sizeof(zone_reclaim_mode),
1422                 .mode           = 0644,
1423                 .proc_handler   = proc_dointvec,
1424                 .extra1         = &zero,
1425         },
1426         {
1427                 .procname       = "min_unmapped_ratio",
1428                 .data           = &sysctl_min_unmapped_ratio,
1429                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1430                 .mode           = 0644,
1431                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1432                 .extra1         = &zero,
1433                 .extra2         = &one_hundred,
1434         },
1435         {
1436                 .procname       = "min_slab_ratio",
1437                 .data           = &sysctl_min_slab_ratio,
1438                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1439                 .mode           = 0644,
1440                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1441                 .extra1         = &zero,
1442                 .extra2         = &one_hundred,
1443         },
1444 #endif
1445 #ifdef CONFIG_SMP
1446         {
1447                 .procname       = "stat_interval",
1448                 .data           = &sysctl_stat_interval,
1449                 .maxlen         = sizeof(sysctl_stat_interval),
1450                 .mode           = 0644,
1451                 .proc_handler   = proc_dointvec_jiffies,
1452         },
1453 #endif
1454 #ifdef CONFIG_MMU
1455         {
1456                 .procname       = "mmap_min_addr",
1457                 .data           = &dac_mmap_min_addr,
1458                 .maxlen         = sizeof(unsigned long),
1459                 .mode           = 0644,
1460                 .proc_handler   = mmap_min_addr_handler,
1461         },
1462 #endif
1463 #ifdef CONFIG_NUMA
1464         {
1465                 .procname       = "numa_zonelist_order",
1466                 .data           = &numa_zonelist_order,
1467                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1468                 .mode           = 0644,
1469                 .proc_handler   = numa_zonelist_order_handler,
1470         },
1471 #endif
1472 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1473    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1474         {
1475                 .procname       = "vdso_enabled",
1476 #ifdef CONFIG_X86_32
1477                 .data           = &vdso32_enabled,
1478                 .maxlen         = sizeof(vdso32_enabled),
1479 #else
1480                 .data           = &vdso_enabled,
1481                 .maxlen         = sizeof(vdso_enabled),
1482 #endif
1483                 .mode           = 0644,
1484                 .proc_handler   = proc_dointvec,
1485                 .extra1         = &zero,
1486         },
1487 #endif
1488 #ifdef CONFIG_HIGHMEM
1489         {
1490                 .procname       = "highmem_is_dirtyable",
1491                 .data           = &vm_highmem_is_dirtyable,
1492                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1493                 .mode           = 0644,
1494                 .proc_handler   = proc_dointvec_minmax,
1495                 .extra1         = &zero,
1496                 .extra2         = &one,
1497         },
1498 #endif
1499 #ifdef CONFIG_MEMORY_FAILURE
1500         {
1501                 .procname       = "memory_failure_early_kill",
1502                 .data           = &sysctl_memory_failure_early_kill,
1503                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1504                 .mode           = 0644,
1505                 .proc_handler   = proc_dointvec_minmax,
1506                 .extra1         = &zero,
1507                 .extra2         = &one,
1508         },
1509         {
1510                 .procname       = "memory_failure_recovery",
1511                 .data           = &sysctl_memory_failure_recovery,
1512                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1513                 .mode           = 0644,
1514                 .proc_handler   = proc_dointvec_minmax,
1515                 .extra1         = &zero,
1516                 .extra2         = &one,
1517         },
1518 #endif
1519         {
1520                 .procname       = "user_reserve_kbytes",
1521                 .data           = &sysctl_user_reserve_kbytes,
1522                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1523                 .mode           = 0644,
1524                 .proc_handler   = proc_doulongvec_minmax,
1525         },
1526         {
1527                 .procname       = "admin_reserve_kbytes",
1528                 .data           = &sysctl_admin_reserve_kbytes,
1529                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1530                 .mode           = 0644,
1531                 .proc_handler   = proc_doulongvec_minmax,
1532         },
1533         { }
1534 };
1535
1536 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1537 static struct ctl_table binfmt_misc_table[] = {
1538         { }
1539 };
1540 #endif
1541
1542 static struct ctl_table fs_table[] = {
1543         {
1544                 .procname       = "inode-nr",
1545                 .data           = &inodes_stat,
1546                 .maxlen         = 2*sizeof(long),
1547                 .mode           = 0444,
1548                 .proc_handler   = proc_nr_inodes,
1549         },
1550         {
1551                 .procname       = "inode-state",
1552                 .data           = &inodes_stat,
1553                 .maxlen         = 7*sizeof(long),
1554                 .mode           = 0444,
1555                 .proc_handler   = proc_nr_inodes,
1556         },
1557         {
1558                 .procname       = "file-nr",
1559                 .data           = &files_stat,
1560                 .maxlen         = sizeof(files_stat),
1561                 .mode           = 0444,
1562                 .proc_handler   = proc_nr_files,
1563         },
1564         {
1565                 .procname       = "file-max",
1566                 .data           = &files_stat.max_files,
1567                 .maxlen         = sizeof(files_stat.max_files),
1568                 .mode           = 0644,
1569                 .proc_handler   = proc_doulongvec_minmax,
1570         },
1571         {
1572                 .procname       = "nr_open",
1573                 .data           = &sysctl_nr_open,
1574                 .maxlen         = sizeof(int),
1575                 .mode           = 0644,
1576                 .proc_handler   = proc_dointvec_minmax,
1577                 .extra1         = &sysctl_nr_open_min,
1578                 .extra2         = &sysctl_nr_open_max,
1579         },
1580         {
1581                 .procname       = "dentry-state",
1582                 .data           = &dentry_stat,
1583                 .maxlen         = 6*sizeof(long),
1584                 .mode           = 0444,
1585                 .proc_handler   = proc_nr_dentry,
1586         },
1587         {
1588                 .procname       = "overflowuid",
1589                 .data           = &fs_overflowuid,
1590                 .maxlen         = sizeof(int),
1591                 .mode           = 0644,
1592                 .proc_handler   = proc_dointvec_minmax,
1593                 .extra1         = &minolduid,
1594                 .extra2         = &maxolduid,
1595         },
1596         {
1597                 .procname       = "overflowgid",
1598                 .data           = &fs_overflowgid,
1599                 .maxlen         = sizeof(int),
1600                 .mode           = 0644,
1601                 .proc_handler   = proc_dointvec_minmax,
1602                 .extra1         = &minolduid,
1603                 .extra2         = &maxolduid,
1604         },
1605 #ifdef CONFIG_FILE_LOCKING
1606         {
1607                 .procname       = "leases-enable",
1608                 .data           = &leases_enable,
1609                 .maxlen         = sizeof(int),
1610                 .mode           = 0644,
1611                 .proc_handler   = proc_dointvec,
1612         },
1613 #endif
1614 #ifdef CONFIG_DNOTIFY
1615         {
1616                 .procname       = "dir-notify-enable",
1617                 .data           = &dir_notify_enable,
1618                 .maxlen         = sizeof(int),
1619                 .mode           = 0644,
1620                 .proc_handler   = proc_dointvec,
1621         },
1622 #endif
1623 #ifdef CONFIG_MMU
1624 #ifdef CONFIG_FILE_LOCKING
1625         {
1626                 .procname       = "lease-break-time",
1627                 .data           = &lease_break_time,
1628                 .maxlen         = sizeof(int),
1629                 .mode           = 0644,
1630                 .proc_handler   = proc_dointvec,
1631         },
1632 #endif
1633 #ifdef CONFIG_AIO
1634         {
1635                 .procname       = "aio-nr",
1636                 .data           = &aio_nr,
1637                 .maxlen         = sizeof(aio_nr),
1638                 .mode           = 0444,
1639                 .proc_handler   = proc_doulongvec_minmax,
1640         },
1641         {
1642                 .procname       = "aio-max-nr",
1643                 .data           = &aio_max_nr,
1644                 .maxlen         = sizeof(aio_max_nr),
1645                 .mode           = 0644,
1646                 .proc_handler   = proc_doulongvec_minmax,
1647         },
1648 #endif /* CONFIG_AIO */
1649 #ifdef CONFIG_INOTIFY_USER
1650         {
1651                 .procname       = "inotify",
1652                 .mode           = 0555,
1653                 .child          = inotify_table,
1654         },
1655 #endif
1656 #ifdef CONFIG_EPOLL
1657         {
1658                 .procname       = "epoll",
1659                 .mode           = 0555,
1660                 .child          = epoll_table,
1661         },
1662 #endif
1663 #endif
1664         {
1665                 .procname       = "protected_symlinks",
1666                 .data           = &sysctl_protected_symlinks,
1667                 .maxlen         = sizeof(int),
1668                 .mode           = 0600,
1669                 .proc_handler   = proc_dointvec_minmax,
1670                 .extra1         = &zero,
1671                 .extra2         = &one,
1672         },
1673         {
1674                 .procname       = "protected_hardlinks",
1675                 .data           = &sysctl_protected_hardlinks,
1676                 .maxlen         = sizeof(int),
1677                 .mode           = 0600,
1678                 .proc_handler   = proc_dointvec_minmax,
1679                 .extra1         = &zero,
1680                 .extra2         = &one,
1681         },
1682         {
1683                 .procname       = "suid_dumpable",
1684                 .data           = &suid_dumpable,
1685                 .maxlen         = sizeof(int),
1686                 .mode           = 0644,
1687                 .proc_handler   = proc_dointvec_minmax_coredump,
1688                 .extra1         = &zero,
1689                 .extra2         = &two,
1690         },
1691 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1692         {
1693                 .procname       = "binfmt_misc",
1694                 .mode           = 0555,
1695                 .child          = binfmt_misc_table,
1696         },
1697 #endif
1698         {
1699                 .procname       = "pipe-max-size",
1700                 .data           = &pipe_max_size,
1701                 .maxlen         = sizeof(int),
1702                 .mode           = 0644,
1703                 .proc_handler   = &pipe_proc_fn,
1704                 .extra1         = &pipe_min_size,
1705         },
1706         { }
1707 };
1708
1709 static struct ctl_table debug_table[] = {
1710 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1711         {
1712                 .procname       = "exception-trace",
1713                 .data           = &show_unhandled_signals,
1714                 .maxlen         = sizeof(int),
1715                 .mode           = 0644,
1716                 .proc_handler   = proc_dointvec
1717         },
1718 #endif
1719 #if defined(CONFIG_OPTPROBES)
1720         {
1721                 .procname       = "kprobes-optimization",
1722                 .data           = &sysctl_kprobes_optimization,
1723                 .maxlen         = sizeof(int),
1724                 .mode           = 0644,
1725                 .proc_handler   = proc_kprobes_optimization_handler,
1726                 .extra1         = &zero,
1727                 .extra2         = &one,
1728         },
1729 #endif
1730         { }
1731 };
1732
1733 static struct ctl_table dev_table[] = {
1734         { }
1735 };
1736
1737 int __init sysctl_init(void)
1738 {
1739         struct ctl_table_header *hdr;
1740
1741         hdr = register_sysctl_table(sysctl_base_table);
1742         kmemleak_not_leak(hdr);
1743         return 0;
1744 }
1745
1746 #endif /* CONFIG_SYSCTL */
1747
1748 /*
1749  * /proc/sys support
1750  */
1751
1752 #ifdef CONFIG_PROC_SYSCTL
1753
1754 static int _proc_do_string(char *data, int maxlen, int write,
1755                            char __user *buffer,
1756                            size_t *lenp, loff_t *ppos)
1757 {
1758         size_t len;
1759         char __user *p;
1760         char c;
1761
1762         if (!data || !maxlen || !*lenp) {
1763                 *lenp = 0;
1764                 return 0;
1765         }
1766
1767         if (write) {
1768                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1769                         /* Only continue writes not past the end of buffer. */
1770                         len = strlen(data);
1771                         if (len > maxlen - 1)
1772                                 len = maxlen - 1;
1773
1774                         if (*ppos > len)
1775                                 return 0;
1776                         len = *ppos;
1777                 } else {
1778                         /* Start writing from beginning of buffer. */
1779                         len = 0;
1780                 }
1781
1782                 *ppos += *lenp;
1783                 p = buffer;
1784                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1785                         if (get_user(c, p++))
1786                                 return -EFAULT;
1787                         if (c == 0 || c == '\n')
1788                                 break;
1789                         data[len++] = c;
1790                 }
1791                 data[len] = 0;
1792         } else {
1793                 len = strlen(data);
1794                 if (len > maxlen)
1795                         len = maxlen;
1796
1797                 if (*ppos > len) {
1798                         *lenp = 0;
1799                         return 0;
1800                 }
1801
1802                 data += *ppos;
1803                 len  -= *ppos;
1804
1805                 if (len > *lenp)
1806                         len = *lenp;
1807                 if (len)
1808                         if (copy_to_user(buffer, data, len))
1809                                 return -EFAULT;
1810                 if (len < *lenp) {
1811                         if (put_user('\n', buffer + len))
1812                                 return -EFAULT;
1813                         len++;
1814                 }
1815                 *lenp = len;
1816                 *ppos += len;
1817         }
1818         return 0;
1819 }
1820
1821 static void warn_sysctl_write(struct ctl_table *table)
1822 {
1823         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1824                 "This will not be supported in the future. To silence this\n"
1825                 "warning, set kernel.sysctl_writes_strict = -1\n",
1826                 current->comm, table->procname);
1827 }
1828
1829 /**
1830  * proc_dostring - read a string sysctl
1831  * @table: the sysctl table
1832  * @write: %TRUE if this is a write to the sysctl file
1833  * @buffer: the user buffer
1834  * @lenp: the size of the user buffer
1835  * @ppos: file position
1836  *
1837  * Reads/writes a string from/to the user buffer. If the kernel
1838  * buffer provided is not large enough to hold the string, the
1839  * string is truncated. The copied string is %NULL-terminated.
1840  * If the string is being read by the user process, it is copied
1841  * and a newline '\n' is added. It is truncated if the buffer is
1842  * not large enough.
1843  *
1844  * Returns 0 on success.
1845  */
1846 int proc_dostring(struct ctl_table *table, int write,
1847                   void __user *buffer, size_t *lenp, loff_t *ppos)
1848 {
1849         if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1850                 warn_sysctl_write(table);
1851
1852         return _proc_do_string((char *)(table->data), table->maxlen, write,
1853                                (char __user *)buffer, lenp, ppos);
1854 }
1855
1856 static size_t proc_skip_spaces(char **buf)
1857 {
1858         size_t ret;
1859         char *tmp = skip_spaces(*buf);
1860         ret = tmp - *buf;
1861         *buf = tmp;
1862         return ret;
1863 }
1864
1865 static void proc_skip_char(char **buf, size_t *size, const char v)
1866 {
1867         while (*size) {
1868                 if (**buf != v)
1869                         break;
1870                 (*size)--;
1871                 (*buf)++;
1872         }
1873 }
1874
1875 #define TMPBUFLEN 22
1876 /**
1877  * proc_get_long - reads an ASCII formatted integer from a user buffer
1878  *
1879  * @buf: a kernel buffer
1880  * @size: size of the kernel buffer
1881  * @val: this is where the number will be stored
1882  * @neg: set to %TRUE if number is negative
1883  * @perm_tr: a vector which contains the allowed trailers
1884  * @perm_tr_len: size of the perm_tr vector
1885  * @tr: pointer to store the trailer character
1886  *
1887  * In case of success %0 is returned and @buf and @size are updated with
1888  * the amount of bytes read. If @tr is non-NULL and a trailing
1889  * character exists (size is non-zero after returning from this
1890  * function), @tr is updated with the trailing character.
1891  */
1892 static int proc_get_long(char **buf, size_t *size,
1893                           unsigned long *val, bool *neg,
1894                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1895 {
1896         int len;
1897         char *p, tmp[TMPBUFLEN];
1898
1899         if (!*size)
1900                 return -EINVAL;
1901
1902         len = *size;
1903         if (len > TMPBUFLEN - 1)
1904                 len = TMPBUFLEN - 1;
1905
1906         memcpy(tmp, *buf, len);
1907
1908         tmp[len] = 0;
1909         p = tmp;
1910         if (*p == '-' && *size > 1) {
1911                 *neg = true;
1912                 p++;
1913         } else
1914                 *neg = false;
1915         if (!isdigit(*p))
1916                 return -EINVAL;
1917
1918         *val = simple_strtoul(p, &p, 0);
1919
1920         len = p - tmp;
1921
1922         /* We don't know if the next char is whitespace thus we may accept
1923          * invalid integers (e.g. 1234...a) or two integers instead of one
1924          * (e.g. 123...1). So lets not allow such large numbers. */
1925         if (len == TMPBUFLEN - 1)
1926                 return -EINVAL;
1927
1928         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1929                 return -EINVAL;
1930
1931         if (tr && (len < *size))
1932                 *tr = *p;
1933
1934         *buf += len;
1935         *size -= len;
1936
1937         return 0;
1938 }
1939
1940 /**
1941  * proc_put_long - converts an integer to a decimal ASCII formatted string
1942  *
1943  * @buf: the user buffer
1944  * @size: the size of the user buffer
1945  * @val: the integer to be converted
1946  * @neg: sign of the number, %TRUE for negative
1947  *
1948  * In case of success %0 is returned and @buf and @size are updated with
1949  * the amount of bytes written.
1950  */
1951 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1952                           bool neg)
1953 {
1954         int len;
1955         char tmp[TMPBUFLEN], *p = tmp;
1956
1957         sprintf(p, "%s%lu", neg ? "-" : "", val);
1958         len = strlen(tmp);
1959         if (len > *size)
1960                 len = *size;
1961         if (copy_to_user(*buf, tmp, len))
1962                 return -EFAULT;
1963         *size -= len;
1964         *buf += len;
1965         return 0;
1966 }
1967 #undef TMPBUFLEN
1968
1969 static int proc_put_char(void __user **buf, size_t *size, char c)
1970 {
1971         if (*size) {
1972                 char __user **buffer = (char __user **)buf;
1973                 if (put_user(c, *buffer))
1974                         return -EFAULT;
1975                 (*size)--, (*buffer)++;
1976                 *buf = *buffer;
1977         }
1978         return 0;
1979 }
1980
1981 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1982                                  int *valp,
1983                                  int write, void *data)
1984 {
1985         if (write) {
1986                 *valp = *negp ? -*lvalp : *lvalp;
1987         } else {
1988                 int val = *valp;
1989                 if (val < 0) {
1990                         *negp = true;
1991                         *lvalp = (unsigned long)-val;
1992                 } else {
1993                         *negp = false;
1994                         *lvalp = (unsigned long)val;
1995                 }
1996         }
1997         return 0;
1998 }
1999
2000 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2001
2002 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2003                   int write, void __user *buffer,
2004                   size_t *lenp, loff_t *ppos,
2005                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2006                               int write, void *data),
2007                   void *data)
2008 {
2009         int *i, vleft, first = 1, err = 0;
2010         unsigned long page = 0;
2011         size_t left;
2012         char *kbuf;
2013
2014         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2015                 *lenp = 0;
2016                 return 0;
2017         }
2018
2019         i = (int *) tbl_data;
2020         vleft = table->maxlen / sizeof(*i);
2021         left = *lenp;
2022
2023         if (!conv)
2024                 conv = do_proc_dointvec_conv;
2025
2026         if (write) {
2027                 if (*ppos) {
2028                         switch (sysctl_writes_strict) {
2029                         case SYSCTL_WRITES_STRICT:
2030                                 goto out;
2031                         case SYSCTL_WRITES_WARN:
2032                                 warn_sysctl_write(table);
2033                                 break;
2034                         default:
2035                                 break;
2036                         }
2037                 }
2038
2039                 if (left > PAGE_SIZE - 1)
2040                         left = PAGE_SIZE - 1;
2041                 page = __get_free_page(GFP_TEMPORARY);
2042                 kbuf = (char *) page;
2043                 if (!kbuf)
2044                         return -ENOMEM;
2045                 if (copy_from_user(kbuf, buffer, left)) {
2046                         err = -EFAULT;
2047                         goto free;
2048                 }
2049                 kbuf[left] = 0;
2050         }
2051
2052         for (; left && vleft--; i++, first=0) {
2053                 unsigned long lval;
2054                 bool neg;
2055
2056                 if (write) {
2057                         left -= proc_skip_spaces(&kbuf);
2058
2059                         if (!left)
2060                                 break;
2061                         err = proc_get_long(&kbuf, &left, &lval, &neg,
2062                                              proc_wspace_sep,
2063                                              sizeof(proc_wspace_sep), NULL);
2064                         if (err)
2065                                 break;
2066                         if (conv(&neg, &lval, i, 1, data)) {
2067                                 err = -EINVAL;
2068                                 break;
2069                         }
2070                 } else {
2071                         if (conv(&neg, &lval, i, 0, data)) {
2072                                 err = -EINVAL;
2073                                 break;
2074                         }
2075                         if (!first)
2076                                 err = proc_put_char(&buffer, &left, '\t');
2077                         if (err)
2078                                 break;
2079                         err = proc_put_long(&buffer, &left, lval, neg);
2080                         if (err)
2081                                 break;
2082                 }
2083         }
2084
2085         if (!write && !first && left && !err)
2086                 err = proc_put_char(&buffer, &left, '\n');
2087         if (write && !err && left)
2088                 left -= proc_skip_spaces(&kbuf);
2089 free:
2090         if (write) {
2091                 free_page(page);
2092                 if (first)
2093                         return err ? : -EINVAL;
2094         }
2095         *lenp -= left;
2096 out:
2097         *ppos += *lenp;
2098         return err;
2099 }
2100
2101 static int do_proc_dointvec(struct ctl_table *table, int write,
2102                   void __user *buffer, size_t *lenp, loff_t *ppos,
2103                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2104                               int write, void *data),
2105                   void *data)
2106 {
2107         return __do_proc_dointvec(table->data, table, write,
2108                         buffer, lenp, ppos, conv, data);
2109 }
2110
2111 /**
2112  * proc_dointvec - read a vector of integers
2113  * @table: the sysctl table
2114  * @write: %TRUE if this is a write to the sysctl file
2115  * @buffer: the user buffer
2116  * @lenp: the size of the user buffer
2117  * @ppos: file position
2118  *
2119  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2120  * values from/to the user buffer, treated as an ASCII string.
2121  *
2122  * Returns 0 on success.
2123  */
2124 int proc_dointvec(struct ctl_table *table, int write,
2125                      void __user *buffer, size_t *lenp, loff_t *ppos)
2126 {
2127     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2128                             NULL,NULL);
2129 }
2130
2131 /*
2132  * Taint values can only be increased
2133  * This means we can safely use a temporary.
2134  */
2135 static int proc_taint(struct ctl_table *table, int write,
2136                                void __user *buffer, size_t *lenp, loff_t *ppos)
2137 {
2138         struct ctl_table t;
2139         unsigned long tmptaint = get_taint();
2140         int err;
2141
2142         if (write && !capable(CAP_SYS_ADMIN))
2143                 return -EPERM;
2144
2145         t = *table;
2146         t.data = &tmptaint;
2147         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2148         if (err < 0)
2149                 return err;
2150
2151         if (write) {
2152                 /*
2153                  * Poor man's atomic or. Not worth adding a primitive
2154                  * to everyone's atomic.h for this
2155                  */
2156                 int i;
2157                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2158                         if ((tmptaint >> i) & 1)
2159                                 add_taint(i, LOCKDEP_STILL_OK);
2160                 }
2161         }
2162
2163         return err;
2164 }
2165
2166 #ifdef CONFIG_PRINTK
2167 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2168                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2169 {
2170         if (write && !capable(CAP_SYS_ADMIN))
2171                 return -EPERM;
2172
2173         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2174 }
2175 #endif
2176
2177 struct do_proc_dointvec_minmax_conv_param {
2178         int *min;
2179         int *max;
2180 };
2181
2182 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2183                                         int *valp,
2184                                         int write, void *data)
2185 {
2186         struct do_proc_dointvec_minmax_conv_param *param = data;
2187         if (write) {
2188                 int val = *negp ? -*lvalp : *lvalp;
2189                 if ((param->min && *param->min > val) ||
2190                     (param->max && *param->max < val))
2191                         return -EINVAL;
2192                 *valp = val;
2193         } else {
2194                 int val = *valp;
2195                 if (val < 0) {
2196                         *negp = true;
2197                         *lvalp = (unsigned long)-val;
2198                 } else {
2199                         *negp = false;
2200                         *lvalp = (unsigned long)val;
2201                 }
2202         }
2203         return 0;
2204 }
2205
2206 /**
2207  * proc_dointvec_minmax - read a vector of integers with min/max values
2208  * @table: the sysctl table
2209  * @write: %TRUE if this is a write to the sysctl file
2210  * @buffer: the user buffer
2211  * @lenp: the size of the user buffer
2212  * @ppos: file position
2213  *
2214  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2215  * values from/to the user buffer, treated as an ASCII string.
2216  *
2217  * This routine will ensure the values are within the range specified by
2218  * table->extra1 (min) and table->extra2 (max).
2219  *
2220  * Returns 0 on success.
2221  */
2222 int proc_dointvec_minmax(struct ctl_table *table, int write,
2223                   void __user *buffer, size_t *lenp, loff_t *ppos)
2224 {
2225         struct do_proc_dointvec_minmax_conv_param param = {
2226                 .min = (int *) table->extra1,
2227                 .max = (int *) table->extra2,
2228         };
2229         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2230                                 do_proc_dointvec_minmax_conv, &param);
2231 }
2232
2233 static void validate_coredump_safety(void)
2234 {
2235 #ifdef CONFIG_COREDUMP
2236         if (suid_dumpable == SUID_DUMP_ROOT &&
2237             core_pattern[0] != '/' && core_pattern[0] != '|') {
2238                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2239                         "suid_dumpable=2. Pipe handler or fully qualified "\
2240                         "core dump path required.\n");
2241         }
2242 #endif
2243 }
2244
2245 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2246                 void __user *buffer, size_t *lenp, loff_t *ppos)
2247 {
2248         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2249         if (!error)
2250                 validate_coredump_safety();
2251         return error;
2252 }
2253
2254 #ifdef CONFIG_COREDUMP
2255 static int proc_dostring_coredump(struct ctl_table *table, int write,
2256                   void __user *buffer, size_t *lenp, loff_t *ppos)
2257 {
2258         int error = proc_dostring(table, write, buffer, lenp, ppos);
2259         if (!error)
2260                 validate_coredump_safety();
2261         return error;
2262 }
2263 #endif
2264
2265 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2266                                      void __user *buffer,
2267                                      size_t *lenp, loff_t *ppos,
2268                                      unsigned long convmul,
2269                                      unsigned long convdiv)
2270 {
2271         unsigned long *i, *min, *max;
2272         int vleft, first = 1, err = 0;
2273         unsigned long page = 0;
2274         size_t left;
2275         char *kbuf;
2276
2277         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2278                 *lenp = 0;
2279                 return 0;
2280         }
2281
2282         i = (unsigned long *) data;
2283         min = (unsigned long *) table->extra1;
2284         max = (unsigned long *) table->extra2;
2285         vleft = table->maxlen / sizeof(unsigned long);
2286         left = *lenp;
2287
2288         if (write) {
2289                 if (*ppos) {
2290                         switch (sysctl_writes_strict) {
2291                         case SYSCTL_WRITES_STRICT:
2292                                 goto out;
2293                         case SYSCTL_WRITES_WARN:
2294                                 warn_sysctl_write(table);
2295                                 break;
2296                         default:
2297                                 break;
2298                         }
2299                 }
2300
2301                 if (left > PAGE_SIZE - 1)
2302                         left = PAGE_SIZE - 1;
2303                 page = __get_free_page(GFP_TEMPORARY);
2304                 kbuf = (char *) page;
2305                 if (!kbuf)
2306                         return -ENOMEM;
2307                 if (copy_from_user(kbuf, buffer, left)) {
2308                         err = -EFAULT;
2309                         goto free;
2310                 }
2311                 kbuf[left] = 0;
2312         }
2313
2314         for (; left && vleft--; i++, first = 0) {
2315                 unsigned long val;
2316
2317                 if (write) {
2318                         bool neg;
2319
2320                         left -= proc_skip_spaces(&kbuf);
2321
2322                         err = proc_get_long(&kbuf, &left, &val, &neg,
2323                                              proc_wspace_sep,
2324                                              sizeof(proc_wspace_sep), NULL);
2325                         if (err)
2326                                 break;
2327                         if (neg)
2328                                 continue;
2329                         if ((min && val < *min) || (max && val > *max))
2330                                 continue;
2331                         *i = val;
2332                 } else {
2333                         val = convdiv * (*i) / convmul;
2334                         if (!first) {
2335                                 err = proc_put_char(&buffer, &left, '\t');
2336                                 if (err)
2337                                         break;
2338                         }
2339                         err = proc_put_long(&buffer, &left, val, false);
2340                         if (err)
2341                                 break;
2342                 }
2343         }
2344
2345         if (!write && !first && left && !err)
2346                 err = proc_put_char(&buffer, &left, '\n');
2347         if (write && !err)
2348                 left -= proc_skip_spaces(&kbuf);
2349 free:
2350         if (write) {
2351                 free_page(page);
2352                 if (first)
2353                         return err ? : -EINVAL;
2354         }
2355         *lenp -= left;
2356 out:
2357         *ppos += *lenp;
2358         return err;
2359 }
2360
2361 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2362                                      void __user *buffer,
2363                                      size_t *lenp, loff_t *ppos,
2364                                      unsigned long convmul,
2365                                      unsigned long convdiv)
2366 {
2367         return __do_proc_doulongvec_minmax(table->data, table, write,
2368                         buffer, lenp, ppos, convmul, convdiv);
2369 }
2370
2371 /**
2372  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2373  * @table: the sysctl table
2374  * @write: %TRUE if this is a write to the sysctl file
2375  * @buffer: the user buffer
2376  * @lenp: the size of the user buffer
2377  * @ppos: file position
2378  *
2379  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2380  * values from/to the user buffer, treated as an ASCII string.
2381  *
2382  * This routine will ensure the values are within the range specified by
2383  * table->extra1 (min) and table->extra2 (max).
2384  *
2385  * Returns 0 on success.
2386  */
2387 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2388                            void __user *buffer, size_t *lenp, loff_t *ppos)
2389 {
2390     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2391 }
2392
2393 /**
2394  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2395  * @table: the sysctl table
2396  * @write: %TRUE if this is a write to the sysctl file
2397  * @buffer: the user buffer
2398  * @lenp: the size of the user buffer
2399  * @ppos: file position
2400  *
2401  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2402  * values from/to the user buffer, treated as an ASCII string. The values
2403  * are treated as milliseconds, and converted to jiffies when they are stored.
2404  *
2405  * This routine will ensure the values are within the range specified by
2406  * table->extra1 (min) and table->extra2 (max).
2407  *
2408  * Returns 0 on success.
2409  */
2410 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2411                                       void __user *buffer,
2412                                       size_t *lenp, loff_t *ppos)
2413 {
2414     return do_proc_doulongvec_minmax(table, write, buffer,
2415                                      lenp, ppos, HZ, 1000l);
2416 }
2417
2418
2419 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2420                                          int *valp,
2421                                          int write, void *data)
2422 {
2423         if (write) {
2424                 if (*lvalp > LONG_MAX / HZ)
2425                         return 1;
2426                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2427         } else {
2428                 int val = *valp;
2429                 unsigned long lval;
2430                 if (val < 0) {
2431                         *negp = true;
2432                         lval = (unsigned long)-val;
2433                 } else {
2434                         *negp = false;
2435                         lval = (unsigned long)val;
2436                 }
2437                 *lvalp = lval / HZ;
2438         }
2439         return 0;
2440 }
2441
2442 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2443                                                 int *valp,
2444                                                 int write, void *data)
2445 {
2446         if (write) {
2447                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2448                         return 1;
2449                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2450         } else {
2451                 int val = *valp;
2452                 unsigned long lval;
2453                 if (val < 0) {
2454                         *negp = true;
2455                         lval = (unsigned long)-val;
2456                 } else {
2457                         *negp = false;
2458                         lval = (unsigned long)val;
2459                 }
2460                 *lvalp = jiffies_to_clock_t(lval);
2461         }
2462         return 0;
2463 }
2464
2465 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2466                                             int *valp,
2467                                             int write, void *data)
2468 {
2469         if (write) {
2470                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2471
2472                 if (jif > INT_MAX)
2473                         return 1;
2474                 *valp = (int)jif;
2475         } else {
2476                 int val = *valp;
2477                 unsigned long lval;
2478                 if (val < 0) {
2479                         *negp = true;
2480                         lval = (unsigned long)-val;
2481                 } else {
2482                         *negp = false;
2483                         lval = (unsigned long)val;
2484                 }
2485                 *lvalp = jiffies_to_msecs(lval);
2486         }
2487         return 0;
2488 }
2489
2490 /**
2491  * proc_dointvec_jiffies - read a vector of integers as seconds
2492  * @table: the sysctl table
2493  * @write: %TRUE if this is a write to the sysctl file
2494  * @buffer: the user buffer
2495  * @lenp: the size of the user buffer
2496  * @ppos: file position
2497  *
2498  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2499  * values from/to the user buffer, treated as an ASCII string.
2500  * The values read are assumed to be in seconds, and are converted into
2501  * jiffies.
2502  *
2503  * Returns 0 on success.
2504  */
2505 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2506                           void __user *buffer, size_t *lenp, loff_t *ppos)
2507 {
2508     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2509                             do_proc_dointvec_jiffies_conv,NULL);
2510 }
2511
2512 /**
2513  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2514  * @table: the sysctl table
2515  * @write: %TRUE if this is a write to the sysctl file
2516  * @buffer: the user buffer
2517  * @lenp: the size of the user buffer
2518  * @ppos: pointer to the file position
2519  *
2520  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2521  * values from/to the user buffer, treated as an ASCII string.
2522  * The values read are assumed to be in 1/USER_HZ seconds, and
2523  * are converted into jiffies.
2524  *
2525  * Returns 0 on success.
2526  */
2527 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2528                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2529 {
2530     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2531                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2532 }
2533
2534 /**
2535  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2536  * @table: the sysctl table
2537  * @write: %TRUE if this is a write to the sysctl file
2538  * @buffer: the user buffer
2539  * @lenp: the size of the user buffer
2540  * @ppos: file position
2541  * @ppos: the current position in the file
2542  *
2543  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2544  * values from/to the user buffer, treated as an ASCII string.
2545  * The values read are assumed to be in 1/1000 seconds, and
2546  * are converted into jiffies.
2547  *
2548  * Returns 0 on success.
2549  */
2550 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2551                              void __user *buffer, size_t *lenp, loff_t *ppos)
2552 {
2553         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2554                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2555 }
2556
2557 static int proc_do_cad_pid(struct ctl_table *table, int write,
2558                            void __user *buffer, size_t *lenp, loff_t *ppos)
2559 {
2560         struct pid *new_pid;
2561         pid_t tmp;
2562         int r;
2563
2564         tmp = pid_vnr(cad_pid);
2565
2566         r = __do_proc_dointvec(&tmp, table, write, buffer,
2567                                lenp, ppos, NULL, NULL);
2568         if (r || !write)
2569                 return r;
2570
2571         new_pid = find_get_pid(tmp);
2572         if (!new_pid)
2573                 return -ESRCH;
2574
2575         put_pid(xchg(&cad_pid, new_pid));
2576         return 0;
2577 }
2578
2579 /**
2580  * proc_do_large_bitmap - read/write from/to a large bitmap
2581  * @table: the sysctl table
2582  * @write: %TRUE if this is a write to the sysctl file
2583  * @buffer: the user buffer
2584  * @lenp: the size of the user buffer
2585  * @ppos: file position
2586  *
2587  * The bitmap is stored at table->data and the bitmap length (in bits)
2588  * in table->maxlen.
2589  *
2590  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2591  * large bitmaps may be represented in a compact manner. Writing into
2592  * the file will clear the bitmap then update it with the given input.
2593  *
2594  * Returns 0 on success.
2595  */
2596 int proc_do_large_bitmap(struct ctl_table *table, int write,
2597                          void __user *buffer, size_t *lenp, loff_t *ppos)
2598 {
2599         int err = 0;
2600         bool first = 1;
2601         size_t left = *lenp;
2602         unsigned long bitmap_len = table->maxlen;
2603         unsigned long *bitmap = *(unsigned long **) table->data;
2604         unsigned long *tmp_bitmap = NULL;
2605         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2606
2607         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2608                 *lenp = 0;
2609                 return 0;
2610         }
2611
2612         if (write) {
2613                 unsigned long page = 0;
2614                 char *kbuf;
2615
2616                 if (left > PAGE_SIZE - 1)
2617                         left = PAGE_SIZE - 1;
2618
2619                 page = __get_free_page(GFP_TEMPORARY);
2620                 kbuf = (char *) page;
2621                 if (!kbuf)
2622                         return -ENOMEM;
2623                 if (copy_from_user(kbuf, buffer, left)) {
2624                         free_page(page);
2625                         return -EFAULT;
2626                 }
2627                 kbuf[left] = 0;
2628
2629                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2630                                      GFP_KERNEL);
2631                 if (!tmp_bitmap) {
2632                         free_page(page);
2633                         return -ENOMEM;
2634                 }
2635                 proc_skip_char(&kbuf, &left, '\n');
2636                 while (!err && left) {
2637                         unsigned long val_a, val_b;
2638                         bool neg;
2639
2640                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2641                                              sizeof(tr_a), &c);
2642                         if (err)
2643                                 break;
2644                         if (val_a >= bitmap_len || neg) {
2645                                 err = -EINVAL;
2646                                 break;
2647                         }
2648
2649                         val_b = val_a;
2650                         if (left) {
2651                                 kbuf++;
2652                                 left--;
2653                         }
2654
2655                         if (c == '-') {
2656                                 err = proc_get_long(&kbuf, &left, &val_b,
2657                                                      &neg, tr_b, sizeof(tr_b),
2658                                                      &c);
2659                                 if (err)
2660                                         break;
2661                                 if (val_b >= bitmap_len || neg ||
2662                                     val_a > val_b) {
2663                                         err = -EINVAL;
2664                                         break;
2665                                 }
2666                                 if (left) {
2667                                         kbuf++;
2668                                         left--;
2669                                 }
2670                         }
2671
2672                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2673                         first = 0;
2674                         proc_skip_char(&kbuf, &left, '\n');
2675                 }
2676                 free_page(page);
2677         } else {
2678                 unsigned long bit_a, bit_b = 0;
2679
2680                 while (left) {
2681                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2682                         if (bit_a >= bitmap_len)
2683                                 break;
2684                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2685                                                    bit_a + 1) - 1;
2686
2687                         if (!first) {
2688                                 err = proc_put_char(&buffer, &left, ',');
2689                                 if (err)
2690                                         break;
2691                         }
2692                         err = proc_put_long(&buffer, &left, bit_a, false);
2693                         if (err)
2694                                 break;
2695                         if (bit_a != bit_b) {
2696                                 err = proc_put_char(&buffer, &left, '-');
2697                                 if (err)
2698                                         break;
2699                                 err = proc_put_long(&buffer, &left, bit_b, false);
2700                                 if (err)
2701                                         break;
2702                         }
2703
2704                         first = 0; bit_b++;
2705                 }
2706                 if (!err)
2707                         err = proc_put_char(&buffer, &left, '\n');
2708         }
2709
2710         if (!err) {
2711                 if (write) {
2712                         if (*ppos)
2713                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2714                         else
2715                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2716                 }
2717                 kfree(tmp_bitmap);
2718                 *lenp -= left;
2719                 *ppos += *lenp;
2720                 return 0;
2721         } else {
2722                 kfree(tmp_bitmap);
2723                 return err;
2724         }
2725 }
2726
2727 #else /* CONFIG_PROC_SYSCTL */
2728
2729 int proc_dostring(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_dointvec(struct ctl_table *table, int write,
2736                   void __user *buffer, size_t *lenp, loff_t *ppos)
2737 {
2738         return -ENOSYS;
2739 }
2740
2741 int proc_dointvec_minmax(struct ctl_table *table, int write,
2742                     void __user *buffer, size_t *lenp, loff_t *ppos)
2743 {
2744         return -ENOSYS;
2745 }
2746
2747 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2748                     void __user *buffer, size_t *lenp, loff_t *ppos)
2749 {
2750         return -ENOSYS;
2751 }
2752
2753 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2754                     void __user *buffer, size_t *lenp, loff_t *ppos)
2755 {
2756         return -ENOSYS;
2757 }
2758
2759 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2760                              void __user *buffer, size_t *lenp, loff_t *ppos)
2761 {
2762         return -ENOSYS;
2763 }
2764
2765 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2766                     void __user *buffer, size_t *lenp, loff_t *ppos)
2767 {
2768         return -ENOSYS;
2769 }
2770
2771 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2772                                       void __user *buffer,
2773                                       size_t *lenp, loff_t *ppos)
2774 {
2775     return -ENOSYS;
2776 }
2777
2778
2779 #endif /* CONFIG_PROC_SYSCTL */
2780
2781 /*
2782  * No sense putting this after each symbol definition, twice,
2783  * exception granted :-)
2784  */
2785 EXPORT_SYMBOL(proc_dointvec);
2786 EXPORT_SYMBOL(proc_dointvec_jiffies);
2787 EXPORT_SYMBOL(proc_dointvec_minmax);
2788 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2789 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2790 EXPORT_SYMBOL(proc_dostring);
2791 EXPORT_SYMBOL(proc_doulongvec_minmax);
2792 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);