kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/bitmap.h>
  27 #include <linux/signal.h>
  28 #include <linux/printk.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/security.h>
  31 #include <linux/ctype.h>
  32 #include <linux/kmemcheck.h>
  33 #include <linux/kmemleak.h>
  34 #include <linux/fs.h>
  35 #include <linux/init.h>
  36 #include <linux/kernel.h>
  37 #include <linux/kobject.h>
  38 #include <linux/net.h>
  39 #include <linux/sysrq.h>
  40 #include <linux/highuid.h>
  41 #include <linux/writeback.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/compaction.h>
  44 #include <linux/hugetlb.h>
  45 #include <linux/initrd.h>
  46 #include <linux/key.h>
  47 #include <linux/times.h>
  48 #include <linux/limits.h>
  49 #include <linux/dcache.h>
  50 #include <linux/dnotify.h>
  51 #include <linux/syscalls.h>
  52 #include <linux/vmstat.h>
  53 #include <linux/nfs_fs.h>
  54 #include <linux/acpi.h>
  55 #include <linux/reboot.h>
  56 #include <linux/ftrace.h>
  57 #include <linux/perf_event.h>
  58 #include <linux/kprobes.h>
  59 #include <linux/pipe_fs_i.h>
  60 #include <linux/oom.h>
  61 #include <linux/kmod.h>
  62 #include <linux/capability.h>
  63 #include <linux/binfmts.h>
  64 #include <linux/sched/sysctl.h>
  65 #include <linux/kexec.h>
  66
  67 #include <asm/uaccess.h>
  68 #include <asm/processor.h>
  69
  70 #ifdef CONFIG_X86
  71 #include <asm/nmi.h>
  72 #include <asm/stacktrace.h>
  73 #include <asm/io.h>
  74 #endif
  75 #ifdef CONFIG_SPARC
  76 #include <asm/setup.h>
  77 #endif
  78 #ifdef CONFIG_BSD_PROCESS_ACCT
  79 #include <linux/acct.h>
  80 #endif
  81 #ifdef CONFIG_RT_MUTEXES
  82 #include <linux/rtmutex.h>
  83 #endif
  84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  85 #include <linux/lockdep.h>
  86 #endif
  87 #ifdef CONFIG_CHR_DEV_SG
  88 #include <scsi/sg.h>
  89 #endif
  90
  91 #ifdef CONFIG_LOCKUP_DETECTOR
  92 #include <linux/nmi.h>
  93 #endif
  94
  95
  96 #if defined(CONFIG_SYSCTL)
  97
  98 /* External variables not in a header file. */
  99 extern int max_threads;
 100 extern int suid_dumpable;
 101 #ifdef CONFIG_COREDUMP
 102 extern int core_uses_pid;
 103 extern char core_pattern[];
 104 extern unsigned int core_pipe_limit;
 105 #endif
 106 extern int pid_max;
 107 extern int pid_max_min, pid_max_max;
 108 extern int percpu_pagelist_fraction;
 109 extern int compat_log;
 110 extern int latencytop_enabled;
 111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 112 #ifndef CONFIG_MMU
 113 extern int sysctl_nr_trim_pages;
 114 #endif
 115
 116 /* Constants used for minimum and  maximum */
 117 #ifdef CONFIG_LOCKUP_DETECTOR
 118 static int sixty = 60;
 119 #endif
 120
 121 static int __maybe_unused neg_one = -1;
 122
 123 static int zero;
 124 static int __maybe_unused one = 1;
 125 static int __maybe_unused two = 2;
 126 static int __maybe_unused four = 4;
 127 static unsigned long one_ul = 1;
 128 static int one_hundred = 100;
 129 #ifdef CONFIG_PRINTK
 130 static int ten_thousand = 10000;
 131 #endif
 132
 133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 135
 136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 137 static int maxolduid = 65535;
 138 static int minolduid;
 139
 140 static int ngroups_max = NGROUPS_MAX;
 141 static const int cap_last_cap = CAP_LAST_CAP;
 142
 143 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
 144 #ifdef CONFIG_DETECT_HUNG_TASK
 145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 146 #endif
 147
 148 #ifdef CONFIG_INOTIFY_USER
 149 #include <linux/inotify.h>
 150 #endif
 151 #ifdef CONFIG_SPARC
 152 #endif
 153
 154 #ifdef __hppa__
 155 extern int pwrsw_enabled;
 156 #endif
 157
 158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 159 extern int unaligned_enabled;
 160 #endif
 161
 162 #ifdef CONFIG_IA64
 163 extern int unaligned_dump_stack;
 164 #endif
 165
 166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 167 extern int no_unaligned_warning;
 168 #endif
 169
 170 #ifdef CONFIG_PROC_SYSCTL
 171
 172 #define SYSCTL_WRITES_LEGACY    -1
 173 #define SYSCTL_WRITES_WARN       0
 174 #define SYSCTL_WRITES_STRICT     1
 175
 176 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
 177
 178 static int proc_do_cad_pid(struct ctl_table *table, int write,
 179                   void __user *buffer, size_t *lenp, loff_t *ppos);
 180 static int proc_taint(struct ctl_table *table, int write,
 181                                void __user *buffer, size_t *lenp, loff_t *ppos);
 182 #endif
 183
 184 #ifdef CONFIG_PRINTK
 185 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 186                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 187 #endif
 188
 189 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 190                 void __user *buffer, size_t *lenp, loff_t *ppos);
 191 #ifdef CONFIG_COREDUMP
 192 static int proc_dostring_coredump(struct ctl_table *table, int write,
 193                 void __user *buffer, size_t *lenp, loff_t *ppos);
 194 #endif
 195
 196 #ifdef CONFIG_MAGIC_SYSRQ
 197 /* Note: sysrq code uses it's own private copy */
 198 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 199
 200 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 201                                 void __user *buffer, size_t *lenp,
 202                                 loff_t *ppos)
 203 {
 204         int error;
 205
 206         error = proc_dointvec(table, write, buffer, lenp, ppos);
 207         if (error)
 208                 return error;
 209
 210         if (write)
 211                 sysrq_toggle_support(__sysrq_enabled);
 212
 213         return 0;
 214 }
 215
 216 #endif
 217
 218 static struct ctl_table kern_table[];
 219 static struct ctl_table vm_table[];
 220 static struct ctl_table fs_table[];
 221 static struct ctl_table debug_table[];
 222 static struct ctl_table dev_table[];
 223 extern struct ctl_table random_table[];
 224 #ifdef CONFIG_EPOLL
 225 extern struct ctl_table epoll_table[];
 226 #endif
 227
 228 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 229 int sysctl_legacy_va_layout;
 230 #endif
 231
 232 /* The default sysctl tables: */
 233
 234 static struct ctl_table sysctl_base_table[] = {
 235         {
 236                 .procname       = "kernel",
 237                 .mode           = 0555,
 238                 .child          = kern_table,
 239         },
 240         {
 241                 .procname       = "vm",
 242                 .mode           = 0555,
 243                 .child          = vm_table,
 244         },
 245         {
 246                 .procname       = "fs",
 247                 .mode           = 0555,
 248                 .child          = fs_table,
 249         },
 250         {
 251                 .procname       = "debug",
 252                 .mode           = 0555,
 253                 .child          = debug_table,
 254         },
 255         {
 256                 .procname       = "dev",
 257                 .mode           = 0555,
 258                 .child          = dev_table,
 259         },
 260         { }
 261 };
 262
 263 #ifdef CONFIG_SCHED_DEBUG
 264 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 265 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 266 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 267 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 268 #ifdef CONFIG_SMP
 269 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 270 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 271 #endif /* CONFIG_SMP */
 272 #endif /* CONFIG_SCHED_DEBUG */
 273
 274 #ifdef CONFIG_COMPACTION
 275 static int min_extfrag_threshold;
 276 static int max_extfrag_threshold = 1000;
 277 #endif
 278
 279 static struct ctl_table kern_table[] = {
 280         {
 281                 .procname       = "sched_child_runs_first",
 282                 .data           = &sysctl_sched_child_runs_first,
 283                 .maxlen         = sizeof(unsigned int),
 284                 .mode           = 0644,
 285                 .proc_handler   = proc_dointvec,
 286         },
 287 #ifdef CONFIG_SCHED_DEBUG
 288         {
 289                 .procname       = "sched_min_granularity_ns",
 290                 .data           = &sysctl_sched_min_granularity,
 291                 .maxlen         = sizeof(unsigned int),
 292                 .mode           = 0644,
 293                 .proc_handler   = sched_proc_update_handler,
 294                 .extra1         = &min_sched_granularity_ns,
 295                 .extra2         = &max_sched_granularity_ns,
 296         },
 297         {
 298                 .procname       = "sched_latency_ns",
 299                 .data           = &sysctl_sched_latency,
 300                 .maxlen         = sizeof(unsigned int),
 301                 .mode           = 0644,
 302                 .proc_handler   = sched_proc_update_handler,
 303                 .extra1         = &min_sched_granularity_ns,
 304                 .extra2         = &max_sched_granularity_ns,
 305         },
 306         {
 307                 .procname       = "sched_wakeup_granularity_ns",
 308                 .data           = &sysctl_sched_wakeup_granularity,
 309                 .maxlen         = sizeof(unsigned int),
 310                 .mode           = 0644,
 311                 .proc_handler   = sched_proc_update_handler,
 312                 .extra1         = &min_wakeup_granularity_ns,
 313                 .extra2         = &max_wakeup_granularity_ns,
 314         },
 315 #ifdef CONFIG_SMP
 316         {
 317                 .procname       = "sched_tunable_scaling",
 318                 .data           = &sysctl_sched_tunable_scaling,
 319                 .maxlen         = sizeof(enum sched_tunable_scaling),
 320                 .mode           = 0644,
 321                 .proc_handler   = sched_proc_update_handler,
 322                 .extra1         = &min_sched_tunable_scaling,
 323                 .extra2         = &max_sched_tunable_scaling,
 324         },
 325         {
 326                 .procname       = "sched_migration_cost_ns",
 327                 .data           = &sysctl_sched_migration_cost,
 328                 .maxlen         = sizeof(unsigned int),
 329                 .mode           = 0644,
 330                 .proc_handler   = proc_dointvec,
 331         },
 332         {
 333                 .procname       = "sched_nr_migrate",
 334                 .data           = &sysctl_sched_nr_migrate,
 335                 .maxlen         = sizeof(unsigned int),
 336                 .mode           = 0644,
 337                 .proc_handler   = proc_dointvec,
 338         },
 339         {
 340                 .procname       = "sched_time_avg_ms",
 341                 .data           = &sysctl_sched_time_avg,
 342                 .maxlen         = sizeof(unsigned int),
 343                 .mode           = 0644,
 344                 .proc_handler   = proc_dointvec,
 345         },
 346         {
 347                 .procname       = "sched_shares_window_ns",
 348                 .data           = &sysctl_sched_shares_window,
 349                 .maxlen         = sizeof(unsigned int),
 350                 .mode           = 0644,
 351                 .proc_handler   = proc_dointvec,
 352         },
 353         {
 354                 .procname       = "timer_migration",
 355                 .data           = &sysctl_timer_migration,
 356                 .maxlen         = sizeof(unsigned int),
 357                 .mode           = 0644,
 358                 .proc_handler   = proc_dointvec_minmax,
 359                 .extra1         = &zero,
 360                 .extra2         = &one,
 361         },
 362 #endif /* CONFIG_SMP */
 363 #ifdef CONFIG_NUMA_BALANCING
 364         {
 365                 .procname       = "numa_balancing_scan_delay_ms",
 366                 .data           = &sysctl_numa_balancing_scan_delay,
 367                 .maxlen         = sizeof(unsigned int),
 368                 .mode           = 0644,
 369                 .proc_handler   = proc_dointvec,
 370         },
 371         {
 372                 .procname       = "numa_balancing_scan_period_min_ms",
 373                 .data           = &sysctl_numa_balancing_scan_period_min,
 374                 .maxlen         = sizeof(unsigned int),
 375                 .mode           = 0644,
 376                 .proc_handler   = proc_dointvec,
 377         },
 378         {
 379                 .procname       = "numa_balancing_scan_period_max_ms",
 380                 .data           = &sysctl_numa_balancing_scan_period_max,
 381                 .maxlen         = sizeof(unsigned int),
 382                 .mode           = 0644,
 383                 .proc_handler   = proc_dointvec,
 384         },
 385         {
 386                 .procname       = "numa_balancing_scan_size_mb",
 387                 .data           = &sysctl_numa_balancing_scan_size,
 388                 .maxlen         = sizeof(unsigned int),
 389                 .mode           = 0644,
 390                 .proc_handler   = proc_dointvec,
 391         },
 392         {
 393                 .procname       = "numa_balancing",
 394                 .data           = NULL, /* filled in by handler */
 395                 .maxlen         = sizeof(unsigned int),
 396                 .mode           = 0644,
 397                 .proc_handler   = sysctl_numa_balancing,
 398                 .extra1         = &zero,
 399                 .extra2         = &one,
 400         },
 401 #endif /* CONFIG_NUMA_BALANCING */
 402 #endif /* CONFIG_SCHED_DEBUG */
 403         {
 404                 .procname       = "sched_rt_period_us",
 405                 .data           = &sysctl_sched_rt_period,
 406                 .maxlen         = sizeof(unsigned int),
 407                 .mode           = 0644,
 408                 .proc_handler   = sched_rt_handler,
 409         },
 410         {
 411                 .procname       = "sched_rt_runtime_us",
 412                 .data           = &sysctl_sched_rt_runtime,
 413                 .maxlen         = sizeof(int),
 414                 .mode           = 0644,
 415                 .proc_handler   = sched_rt_handler,
 416         },
 417         {
 418                 .procname       = "sched_rr_timeslice_ms",
 419                 .data           = &sched_rr_timeslice,
 420                 .maxlen         = sizeof(int),
 421                 .mode           = 0644,
 422                 .proc_handler   = sched_rr_handler,
 423         },
 424 #ifdef CONFIG_SCHED_AUTOGROUP
 425         {
 426                 .procname       = "sched_autogroup_enabled",
 427                 .data           = &sysctl_sched_autogroup_enabled,
 428                 .maxlen         = sizeof(unsigned int),
 429                 .mode           = 0644,
 430                 .proc_handler   = proc_dointvec_minmax,
 431                 .extra1         = &zero,
 432                 .extra2         = &one,
 433         },
 434 #endif
 435 #ifdef CONFIG_CFS_BANDWIDTH
 436         {
 437                 .procname       = "sched_cfs_bandwidth_slice_us",
 438                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 439                 .maxlen         = sizeof(unsigned int),
 440                 .mode           = 0644,
 441                 .proc_handler   = proc_dointvec_minmax,
 442                 .extra1         = &one,
 443         },
 444 #endif
 445 #ifdef CONFIG_PROVE_LOCKING
 446         {
 447                 .procname       = "prove_locking",
 448                 .data           = &prove_locking,
 449                 .maxlen         = sizeof(int),
 450                 .mode           = 0644,
 451                 .proc_handler   = proc_dointvec,
 452         },
 453 #endif
 454 #ifdef CONFIG_LOCK_STAT
 455         {
 456                 .procname       = "lock_stat",
 457                 .data           = &lock_stat,
 458                 .maxlen         = sizeof(int),
 459                 .mode           = 0644,
 460                 .proc_handler   = proc_dointvec,
 461         },
 462 #endif
 463         {
 464                 .procname       = "panic",
 465                 .data           = &panic_timeout,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec,
 469         },
 470 #ifdef CONFIG_COREDUMP
 471         {
 472                 .procname       = "core_uses_pid",
 473                 .data           = &core_uses_pid,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = proc_dointvec,
 477         },
 478         {
 479                 .procname       = "core_pattern",
 480                 .data           = core_pattern,
 481                 .maxlen         = CORENAME_MAX_SIZE,
 482                 .mode           = 0644,
 483                 .proc_handler   = proc_dostring_coredump,
 484         },
 485         {
 486                 .procname       = "core_pipe_limit",
 487                 .data           = &core_pipe_limit,
 488                 .maxlen         = sizeof(unsigned int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec,
 491         },
 492 #endif
 493 #ifdef CONFIG_PROC_SYSCTL
 494         {
 495                 .procname       = "tainted",
 496                 .maxlen         = sizeof(long),
 497                 .mode           = 0644,
 498                 .proc_handler   = proc_taint,
 499         },
 500         {
 501                 .procname       = "sysctl_writes_strict",
 502                 .data           = &sysctl_writes_strict,
 503                 .maxlen         = sizeof(int),
 504                 .mode           = 0644,
 505                 .proc_handler   = proc_dointvec_minmax,
 506                 .extra1         = &neg_one,
 507                 .extra2         = &one,
 508         },
 509 #endif
 510 #ifdef CONFIG_LATENCYTOP
 511         {
 512                 .procname       = "latencytop",
 513                 .data           = &latencytop_enabled,
 514                 .maxlen         = sizeof(int),
 515                 .mode           = 0644,
 516                 .proc_handler   = proc_dointvec,
 517         },
 518 #endif
 519 #ifdef CONFIG_BLK_DEV_INITRD
 520         {
 521                 .procname       = "real-root-dev",
 522                 .data           = &real_root_dev,
 523                 .maxlen         = sizeof(int),
 524                 .mode           = 0644,
 525                 .proc_handler   = proc_dointvec,
 526         },
 527 #endif
 528         {
 529                 .procname       = "print-fatal-signals",
 530                 .data           = &print_fatal_signals,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = proc_dointvec,
 534         },
 535 #ifdef CONFIG_SPARC
 536         {
 537                 .procname       = "reboot-cmd",
 538                 .data           = reboot_command,
 539                 .maxlen         = 256,
 540                 .mode           = 0644,
 541                 .proc_handler   = proc_dostring,
 542         },
 543         {
 544                 .procname       = "stop-a",
 545                 .data           = &stop_a_enabled,
 546                 .maxlen         = sizeof (int),
 547                 .mode           = 0644,
 548                 .proc_handler   = proc_dointvec,
 549         },
 550         {
 551                 .procname       = "scons-poweroff",
 552                 .data           = &scons_pwroff,
 553                 .maxlen         = sizeof (int),
 554                 .mode           = 0644,
 555                 .proc_handler   = proc_dointvec,
 556         },
 557 #endif
 558 #ifdef CONFIG_SPARC64
 559         {
 560                 .procname       = "tsb-ratio",
 561                 .data           = &sysctl_tsb_ratio,
 562                 .maxlen         = sizeof (int),
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_dointvec,
 565         },
 566 #endif
 567 #ifdef __hppa__
 568         {
 569                 .procname       = "soft-power",
 570                 .data           = &pwrsw_enabled,
 571                 .maxlen         = sizeof (int),
 572                 .mode           = 0644,
 573                 .proc_handler   = proc_dointvec,
 574         },
 575 #endif
 576 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 577         {
 578                 .procname       = "unaligned-trap",
 579                 .data           = &unaligned_enabled,
 580                 .maxlen         = sizeof (int),
 581                 .mode           = 0644,
 582                 .proc_handler   = proc_dointvec,
 583         },
 584 #endif
 585         {
 586                 .procname       = "ctrl-alt-del",
 587                 .data           = &C_A_D,
 588                 .maxlen         = sizeof(int),
 589                 .mode           = 0644,
 590                 .proc_handler   = proc_dointvec,
 591         },
 592 #ifdef CONFIG_FUNCTION_TRACER
 593         {
 594                 .procname       = "ftrace_enabled",
 595                 .data           = &ftrace_enabled,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = ftrace_enable_sysctl,
 599         },
 600 #endif
 601 #ifdef CONFIG_STACK_TRACER
 602         {
 603                 .procname       = "stack_tracer_enabled",
 604                 .data           = &stack_tracer_enabled,
 605                 .maxlen         = sizeof(int),
 606                 .mode           = 0644,
 607                 .proc_handler   = stack_trace_sysctl,
 608         },
 609 #endif
 610 #ifdef CONFIG_TRACING
 611         {
 612                 .procname       = "ftrace_dump_on_oops",
 613                 .data           = &ftrace_dump_on_oops,
 614                 .maxlen         = sizeof(int),
 615                 .mode           = 0644,
 616                 .proc_handler   = proc_dointvec,
 617         },
 618         {
 619                 .procname       = "traceoff_on_warning",
 620                 .data           = &__disable_trace_on_warning,
 621                 .maxlen         = sizeof(__disable_trace_on_warning),
 622                 .mode           = 0644,
 623                 .proc_handler   = proc_dointvec,
 624         },
 625 #endif
 626 #ifdef CONFIG_KEXEC
 627         {
 628                 .procname       = "kexec_load_disabled",
 629                 .data           = &kexec_load_disabled,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 /* only handle a transition from default "0" to "1" */
 633                 .proc_handler   = proc_dointvec_minmax,
 634                 .extra1         = &one,
 635                 .extra2         = &one,
 636         },
 637 #endif
 638 #ifdef CONFIG_MODULES
 639         {
 640                 .procname       = "modprobe",
 641                 .data           = &modprobe_path,
 642                 .maxlen         = KMOD_PATH_LEN,
 643                 .mode           = 0644,
 644                 .proc_handler   = proc_dostring,
 645         },
 646         {
 647                 .procname       = "modules_disabled",
 648                 .data           = &modules_disabled,
 649                 .maxlen         = sizeof(int),
 650                 .mode           = 0644,
 651                 /* only handle a transition from default "0" to "1" */
 652                 .proc_handler   = proc_dointvec_minmax,
 653                 .extra1         = &one,
 654                 .extra2         = &one,
 655         },
 656 #endif
 657 #ifdef CONFIG_UEVENT_HELPER
 658         {
 659                 .procname       = "hotplug",
 660                 .data           = &uevent_helper,
 661                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 662                 .mode           = 0644,
 663                 .proc_handler   = proc_dostring,
 664         },
 665 #endif
 666 #ifdef CONFIG_CHR_DEV_SG
 667         {
 668                 .procname       = "sg-big-buff",
 669                 .data           = &sg_big_buff,
 670                 .maxlen         = sizeof (int),
 671                 .mode           = 0444,
 672                 .proc_handler   = proc_dointvec,
 673         },
 674 #endif
 675 #ifdef CONFIG_BSD_PROCESS_ACCT
 676         {
 677                 .procname       = "acct",
 678                 .data           = &acct_parm,
 679                 .maxlen         = 3*sizeof(int),
 680                 .mode           = 0644,
 681                 .proc_handler   = proc_dointvec,
 682         },
 683 #endif
 684 #ifdef CONFIG_MAGIC_SYSRQ
 685         {
 686                 .procname       = "sysrq",
 687                 .data           = &__sysrq_enabled,
 688                 .maxlen         = sizeof (int),
 689                 .mode           = 0644,
 690                 .proc_handler   = sysrq_sysctl_handler,
 691         },
 692 #endif
 693 #ifdef CONFIG_PROC_SYSCTL
 694         {
 695                 .procname       = "cad_pid",
 696                 .data           = NULL,
 697                 .maxlen         = sizeof (int),
 698                 .mode           = 0600,
 699                 .proc_handler   = proc_do_cad_pid,
 700         },
 701 #endif
 702         {
 703                 .procname       = "threads-max",
 704                 .data           = &max_threads,
 705                 .maxlen         = sizeof(int),
 706                 .mode           = 0644,
 707                 .proc_handler   = proc_dointvec,
 708         },
 709         {
 710                 .procname       = "random",
 711                 .mode           = 0555,
 712                 .child          = random_table,
 713         },
 714         {
 715                 .procname       = "usermodehelper",
 716                 .mode           = 0555,
 717                 .child          = usermodehelper_table,
 718         },
 719         {
 720                 .procname       = "overflowuid",
 721                 .data           = &overflowuid,
 722                 .maxlen         = sizeof(int),
 723                 .mode           = 0644,
 724                 .proc_handler   = proc_dointvec_minmax,
 725                 .extra1         = &minolduid,
 726                 .extra2         = &maxolduid,
 727         },
 728         {
 729                 .procname       = "overflowgid",
 730                 .data           = &overflowgid,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_dointvec_minmax,
 734                 .extra1         = &minolduid,
 735                 .extra2         = &maxolduid,
 736         },
 737 #ifdef CONFIG_S390
 738 #ifdef CONFIG_MATHEMU
 739         {
 740                 .procname       = "ieee_emulation_warnings",
 741                 .data           = &sysctl_ieee_emulation_warnings,
 742                 .maxlen         = sizeof(int),
 743                 .mode           = 0644,
 744                 .proc_handler   = proc_dointvec,
 745         },
 746 #endif
 747         {
 748                 .procname       = "userprocess_debug",
 749                 .data           = &show_unhandled_signals,
 750                 .maxlen         = sizeof(int),
 751                 .mode           = 0644,
 752                 .proc_handler   = proc_dointvec,
 753         },
 754 #endif
 755         {
 756                 .procname       = "pid_max",
 757                 .data           = &pid_max,
 758                 .maxlen         = sizeof (int),
 759                 .mode           = 0644,
 760                 .proc_handler   = proc_dointvec_minmax,
 761                 .extra1         = &pid_max_min,
 762                 .extra2         = &pid_max_max,
 763         },
 764         {
 765                 .procname       = "panic_on_oops",
 766                 .data           = &panic_on_oops,
 767                 .maxlen         = sizeof(int),
 768                 .mode           = 0644,
 769                 .proc_handler   = proc_dointvec,
 770         },
 771 #if defined CONFIG_PRINTK
 772         {
 773                 .procname       = "printk",
 774                 .data           = &console_loglevel,
 775                 .maxlen         = 4*sizeof(int),
 776                 .mode           = 0644,
 777                 .proc_handler   = proc_dointvec,
 778         },
 779         {
 780                 .procname       = "printk_ratelimit",
 781                 .data           = &printk_ratelimit_state.interval,
 782                 .maxlen         = sizeof(int),
 783                 .mode           = 0644,
 784                 .proc_handler   = proc_dointvec_jiffies,
 785         },
 786         {
 787                 .procname       = "printk_ratelimit_burst",
 788                 .data           = &printk_ratelimit_state.burst,
 789                 .maxlen         = sizeof(int),
 790                 .mode           = 0644,
 791                 .proc_handler   = proc_dointvec,
 792         },
 793         {
 794                 .procname       = "printk_delay",
 795                 .data           = &printk_delay_msec,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = proc_dointvec_minmax,
 799                 .extra1         = &zero,
 800                 .extra2         = &ten_thousand,
 801         },
 802         {
 803                 .procname       = "dmesg_restrict",
 804                 .data           = &dmesg_restrict,
 805                 .maxlen         = sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 808                 .extra1         = &zero,
 809                 .extra2         = &one,
 810         },
 811         {
 812                 .procname       = "kptr_restrict",
 813                 .data           = &kptr_restrict,
 814                 .maxlen         = sizeof(int),
 815                 .mode           = 0644,
 816                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 817                 .extra1         = &zero,
 818                 .extra2         = &two,
 819         },
 820 #endif
 821         {
 822                 .procname       = "ngroups_max",
 823                 .data           = &ngroups_max,
 824                 .maxlen         = sizeof (int),
 825                 .mode           = 0444,
 826                 .proc_handler   = proc_dointvec,
 827         },
 828         {
 829                 .procname       = "cap_last_cap",
 830                 .data           = (void *)&cap_last_cap,
 831                 .maxlen         = sizeof(int),
 832                 .mode           = 0444,
 833                 .proc_handler   = proc_dointvec,
 834         },
 835 #if defined(CONFIG_LOCKUP_DETECTOR)
 836         {
 837                 .procname       = "watchdog",
 838                 .data           = &watchdog_user_enabled,
 839                 .maxlen         = sizeof (int),
 840                 .mode           = 0644,
 841                 .proc_handler   = proc_dowatchdog,
 842                 .extra1         = &zero,
 843                 .extra2         = &one,
 844         },
 845         {
 846                 .procname       = "watchdog_thresh",
 847                 .data           = &watchdog_thresh,
 848                 .maxlen         = sizeof(int),
 849                 .mode           = 0644,
 850                 .proc_handler   = proc_dowatchdog,
 851                 .extra1         = &zero,
 852                 .extra2         = &sixty,
 853         },
 854         {
 855                 .procname       = "softlockup_panic",
 856                 .data           = &softlockup_panic,
 857                 .maxlen         = sizeof(int),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_dointvec_minmax,
 860                 .extra1         = &zero,
 861                 .extra2         = &one,
 862         },
 863 #ifdef CONFIG_SMP
 864         {
 865                 .procname       = "softlockup_all_cpu_backtrace",
 866                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 867                 .maxlen         = sizeof(int),
 868                 .mode           = 0644,
 869                 .proc_handler   = proc_dointvec_minmax,
 870                 .extra1         = &zero,
 871                 .extra2         = &one,
 872         },
 873 #endif /* CONFIG_SMP */
 874         {
 875                 .procname       = "nmi_watchdog",
 876                 .data           = &watchdog_user_enabled,
 877                 .maxlen         = sizeof (int),
 878                 .mode           = 0644,
 879                 .proc_handler   = proc_dowatchdog,
 880                 .extra1         = &zero,
 881                 .extra2         = &one,
 882         },
 883 #endif
 884 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 885         {
 886                 .procname       = "unknown_nmi_panic",
 887                 .data           = &unknown_nmi_panic,
 888                 .maxlen         = sizeof (int),
 889                 .mode           = 0644,
 890                 .proc_handler   = proc_dointvec,
 891         },
 892 #endif
 893 #if defined(CONFIG_X86)
 894         {
 895                 .procname       = "panic_on_unrecovered_nmi",
 896                 .data           = &panic_on_unrecovered_nmi,
 897                 .maxlen         = sizeof(int),
 898                 .mode           = 0644,
 899                 .proc_handler   = proc_dointvec,
 900         },
 901         {
 902                 .procname       = "panic_on_io_nmi",
 903                 .data           = &panic_on_io_nmi,
 904                 .maxlen         = sizeof(int),
 905                 .mode           = 0644,
 906                 .proc_handler   = proc_dointvec,
 907         },
 908 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 909         {
 910                 .procname       = "panic_on_stackoverflow",
 911                 .data           = &sysctl_panic_on_stackoverflow,
 912                 .maxlen         = sizeof(int),
 913                 .mode           = 0644,
 914                 .proc_handler   = proc_dointvec,
 915         },
 916 #endif
 917         {
 918                 .procname       = "bootloader_type",
 919                 .data           = &bootloader_type,
 920                 .maxlen         = sizeof (int),
 921                 .mode           = 0444,
 922                 .proc_handler   = proc_dointvec,
 923         },
 924         {
 925                 .procname       = "bootloader_version",
 926                 .data           = &bootloader_version,
 927                 .maxlen         = sizeof (int),
 928                 .mode           = 0444,
 929                 .proc_handler   = proc_dointvec,
 930         },
 931         {
 932                 .procname       = "kstack_depth_to_print",
 933                 .data           = &kstack_depth_to_print,
 934                 .maxlen         = sizeof(int),
 935                 .mode           = 0644,
 936                 .proc_handler   = proc_dointvec,
 937         },
 938         {
 939                 .procname       = "io_delay_type",
 940                 .data           = &io_delay_type,
 941                 .maxlen         = sizeof(int),
 942                 .mode           = 0644,
 943                 .proc_handler   = proc_dointvec,
 944         },
 945 #endif
 946 #if defined(CONFIG_MMU)
 947         {
 948                 .procname       = "randomize_va_space",
 949                 .data           = &randomize_va_space,
 950                 .maxlen         = sizeof(int),
 951                 .mode           = 0644,
 952                 .proc_handler   = proc_dointvec,
 953         },
 954 #endif
 955 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 956         {
 957                 .procname       = "spin_retry",
 958                 .data           = &spin_retry,
 959                 .maxlen         = sizeof (int),
 960                 .mode           = 0644,
 961                 .proc_handler   = proc_dointvec,
 962         },
 963 #endif
 964 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 965         {
 966                 .procname       = "acpi_video_flags",
 967                 .data           = &acpi_realmode_flags,
 968                 .maxlen         = sizeof (unsigned long),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_doulongvec_minmax,
 971         },
 972 #endif
 973 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 974         {
 975                 .procname       = "ignore-unaligned-usertrap",
 976                 .data           = &no_unaligned_warning,
 977                 .maxlen         = sizeof (int),
 978                 .mode           = 0644,
 979                 .proc_handler   = proc_dointvec,
 980         },
 981 #endif
 982 #ifdef CONFIG_IA64
 983         {
 984                 .procname       = "unaligned-dump-stack",
 985                 .data           = &unaligned_dump_stack,
 986                 .maxlen         = sizeof (int),
 987                 .mode           = 0644,
 988                 .proc_handler   = proc_dointvec,
 989         },
 990 #endif
 991 #ifdef CONFIG_DETECT_HUNG_TASK
 992         {
 993                 .procname       = "hung_task_panic",
 994                 .data           = &sysctl_hung_task_panic,
 995                 .maxlen         = sizeof(int),
 996                 .mode           = 0644,
 997                 .proc_handler   = proc_dointvec_minmax,
 998                 .extra1         = &zero,
 999                 .extra2         = &one,
1000         },
1001         {
1002                 .procname       = "hung_task_check_count",
1003                 .data           = &sysctl_hung_task_check_count,
1004                 .maxlen         = sizeof(int),
1005                 .mode           = 0644,
1006                 .proc_handler   = proc_dointvec_minmax,
1007                 .extra1         = &zero,
1008         },
1009         {
1010                 .procname       = "hung_task_timeout_secs",
1011                 .data           = &sysctl_hung_task_timeout_secs,
1012                 .maxlen         = sizeof(unsigned long),
1013                 .mode           = 0644,
1014                 .proc_handler   = proc_dohung_task_timeout_secs,
1015                 .extra2         = &hung_task_timeout_max,
1016         },
1017         {
1018                 .procname       = "hung_task_warnings",
1019                 .data           = &sysctl_hung_task_warnings,
1020                 .maxlen         = sizeof(int),
1021                 .mode           = 0644,
1022                 .proc_handler   = proc_dointvec_minmax,
1023                 .extra1         = &neg_one,
1024         },
1025 #endif
1026 #ifdef CONFIG_COMPAT
1027         {
1028                 .procname       = "compat-log",
1029                 .data           = &compat_log,
1030                 .maxlen         = sizeof (int),
1031                 .mode           = 0644,
1032                 .proc_handler   = proc_dointvec,
1033         },
1034 #endif
1035 #ifdef CONFIG_RT_MUTEXES
1036         {
1037                 .procname       = "max_lock_depth",
1038                 .data           = &max_lock_depth,
1039                 .maxlen         = sizeof(int),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_dointvec,
1042         },
1043 #endif
1044         {
1045                 .procname       = "poweroff_cmd",
1046                 .data           = &poweroff_cmd,
1047                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1048                 .mode           = 0644,
1049                 .proc_handler   = proc_dostring,
1050         },
1051 #ifdef CONFIG_KEYS
1052         {
1053                 .procname       = "keys",
1054                 .mode           = 0555,
1055                 .child          = key_sysctls,
1056         },
1057 #endif
1058 #ifdef CONFIG_RCU_TORTURE_TEST
1059         {
1060                 .procname       = "rcutorture_runnable",
1061                 .data           = &rcutorture_runnable,
1062                 .maxlen         = sizeof(int),
1063                 .mode           = 0644,
1064                 .proc_handler   = proc_dointvec,
1065         },
1066 #endif
1067 #ifdef CONFIG_PERF_EVENTS
1068         /*
1069          * User-space scripts rely on the existence of this file
1070          * as a feature check for perf_events being enabled.
1071          *
1072          * So it's an ABI, do not remove!
1073          */
1074         {
1075                 .procname       = "perf_event_paranoid",
1076                 .data           = &sysctl_perf_event_paranoid,
1077                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1078                 .mode           = 0644,
1079                 .proc_handler   = proc_dointvec,
1080         },
1081         {
1082                 .procname       = "perf_event_mlock_kb",
1083                 .data           = &sysctl_perf_event_mlock,
1084                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1085                 .mode           = 0644,
1086                 .proc_handler   = proc_dointvec,
1087         },
1088         {
1089                 .procname       = "perf_event_max_sample_rate",
1090                 .data           = &sysctl_perf_event_sample_rate,
1091                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1092                 .mode           = 0644,
1093                 .proc_handler   = perf_proc_update_handler,
1094                 .extra1         = &one,
1095         },
1096         {
1097                 .procname       = "perf_cpu_time_max_percent",
1098                 .data           = &sysctl_perf_cpu_time_max_percent,
1099                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1100                 .mode           = 0644,
1101                 .proc_handler   = perf_cpu_time_max_percent_handler,
1102                 .extra1         = &zero,
1103                 .extra2         = &one_hundred,
1104         },
1105 #endif
1106 #ifdef CONFIG_KMEMCHECK
1107         {
1108                 .procname       = "kmemcheck",
1109                 .data           = &kmemcheck_enabled,
1110                 .maxlen         = sizeof(int),
1111                 .mode           = 0644,
1112                 .proc_handler   = proc_dointvec,
1113         },
1114 #endif
1115         { }
1116 };
1117
1118 static struct ctl_table vm_table[] = {
1119         {
1120                 .procname       = "overcommit_memory",
1121                 .data           = &sysctl_overcommit_memory,
1122                 .maxlen         = sizeof(sysctl_overcommit_memory),
1123                 .mode           = 0644,
1124                 .proc_handler   = proc_dointvec_minmax,
1125                 .extra1         = &zero,
1126                 .extra2         = &two,
1127         },
1128         {
1129                 .procname       = "panic_on_oom",
1130                 .data           = &sysctl_panic_on_oom,
1131                 .maxlen         = sizeof(sysctl_panic_on_oom),
1132                 .mode           = 0644,
1133                 .proc_handler   = proc_dointvec_minmax,
1134                 .extra1         = &zero,
1135                 .extra2         = &two,
1136         },
1137         {
1138                 .procname       = "oom_kill_allocating_task",
1139                 .data           = &sysctl_oom_kill_allocating_task,
1140                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1141                 .mode           = 0644,
1142                 .proc_handler   = proc_dointvec,
1143         },
1144         {
1145                 .procname       = "oom_dump_tasks",
1146                 .data           = &sysctl_oom_dump_tasks,
1147                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1148                 .mode           = 0644,
1149                 .proc_handler   = proc_dointvec,
1150         },
1151         {
1152                 .procname       = "overcommit_ratio",
1153                 .data           = &sysctl_overcommit_ratio,
1154                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1155                 .mode           = 0644,
1156                 .proc_handler   = overcommit_ratio_handler,
1157         },
1158         {
1159                 .procname       = "overcommit_kbytes",
1160                 .data           = &sysctl_overcommit_kbytes,
1161                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1162                 .mode           = 0644,
1163                 .proc_handler   = overcommit_kbytes_handler,
1164         },
1165         {
1166                 .procname       = "page-cluster",
1167                 .data           = &page_cluster,
1168                 .maxlen         = sizeof(int),
1169                 .mode           = 0644,
1170                 .proc_handler   = proc_dointvec_minmax,
1171                 .extra1         = &zero,
1172         },
1173         {
1174                 .procname       = "dirty_background_ratio",
1175                 .data           = &dirty_background_ratio,
1176                 .maxlen         = sizeof(dirty_background_ratio),
1177                 .mode           = 0644,
1178                 .proc_handler   = dirty_background_ratio_handler,
1179                 .extra1         = &zero,
1180                 .extra2         = &one_hundred,
1181         },
1182         {
1183                 .procname       = "dirty_background_bytes",
1184                 .data           = &dirty_background_bytes,
1185                 .maxlen         = sizeof(dirty_background_bytes),
1186                 .mode           = 0644,
1187                 .proc_handler   = dirty_background_bytes_handler,
1188                 .extra1         = &one_ul,
1189         },
1190         {
1191                 .procname       = "dirty_ratio",
1192                 .data           = &vm_dirty_ratio,
1193                 .maxlen         = sizeof(vm_dirty_ratio),
1194                 .mode           = 0644,
1195                 .proc_handler   = dirty_ratio_handler,
1196                 .extra1         = &zero,
1197                 .extra2         = &one_hundred,
1198         },
1199         {
1200                 .procname       = "dirty_bytes",
1201                 .data           = &vm_dirty_bytes,
1202                 .maxlen         = sizeof(vm_dirty_bytes),
1203                 .mode           = 0644,
1204                 .proc_handler   = dirty_bytes_handler,
1205                 .extra1         = &dirty_bytes_min,
1206         },
1207         {
1208                 .procname       = "dirty_writeback_centisecs",
1209                 .data           = &dirty_writeback_interval,
1210                 .maxlen         = sizeof(dirty_writeback_interval),
1211                 .mode           = 0644,
1212                 .proc_handler   = dirty_writeback_centisecs_handler,
1213         },
1214         {
1215                 .procname       = "dirty_expire_centisecs",
1216                 .data           = &dirty_expire_interval,
1217                 .maxlen         = sizeof(dirty_expire_interval),
1218                 .mode           = 0644,
1219                 .proc_handler   = proc_dointvec_minmax,
1220                 .extra1         = &zero,
1221         },
1222         {
1223                 .procname       = "nr_pdflush_threads",
1224                 .mode           = 0444 /* read-only */,
1225                 .proc_handler   = pdflush_proc_obsolete,
1226         },
1227         {
1228                 .procname       = "swappiness",
1229                 .data           = &vm_swappiness,
1230                 .maxlen         = sizeof(vm_swappiness),
1231                 .mode           = 0644,
1232                 .proc_handler   = proc_dointvec_minmax,
1233                 .extra1         = &zero,
1234                 .extra2         = &one_hundred,
1235         },
1236 #ifdef CONFIG_HUGETLB_PAGE
1237         {
1238                 .procname       = "nr_hugepages",
1239                 .data           = NULL,
1240                 .maxlen         = sizeof(unsigned long),
1241                 .mode           = 0644,
1242                 .proc_handler   = hugetlb_sysctl_handler,
1243                 .extra1         = (void *)&hugetlb_zero,
1244                 .extra2         = (void *)&hugetlb_infinity,
1245         },
1246 #ifdef CONFIG_NUMA
1247         {
1248                 .procname       = "nr_hugepages_mempolicy",
1249                 .data           = NULL,
1250                 .maxlen         = sizeof(unsigned long),
1251                 .mode           = 0644,
1252                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1253                 .extra1         = (void *)&hugetlb_zero,
1254                 .extra2         = (void *)&hugetlb_infinity,
1255         },
1256 #endif
1257          {
1258                 .procname       = "hugetlb_shm_group",
1259                 .data           = &sysctl_hugetlb_shm_group,
1260                 .maxlen         = sizeof(gid_t),
1261                 .mode           = 0644,
1262                 .proc_handler   = proc_dointvec,
1263          },
1264          {
1265                 .procname       = "hugepages_treat_as_movable",
1266                 .data           = &hugepages_treat_as_movable,
1267                 .maxlen         = sizeof(int),
1268                 .mode           = 0644,
1269                 .proc_handler   = proc_dointvec,
1270         },
1271         {
1272                 .procname       = "nr_overcommit_hugepages",
1273                 .data           = NULL,
1274                 .maxlen         = sizeof(unsigned long),
1275                 .mode           = 0644,
1276                 .proc_handler   = hugetlb_overcommit_handler,
1277                 .extra1         = (void *)&hugetlb_zero,
1278                 .extra2         = (void *)&hugetlb_infinity,
1279         },
1280 #endif
1281         {
1282                 .procname       = "lowmem_reserve_ratio",
1283                 .data           = &sysctl_lowmem_reserve_ratio,
1284                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1285                 .mode           = 0644,
1286                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1287         },
1288         {
1289                 .procname       = "drop_caches",
1290                 .data           = &sysctl_drop_caches,
1291                 .maxlen         = sizeof(int),
1292                 .mode           = 0644,
1293                 .proc_handler   = drop_caches_sysctl_handler,
1294                 .extra1         = &one,
1295                 .extra2         = &four,
1296         },
1297 #ifdef CONFIG_COMPACTION
1298         {
1299                 .procname       = "compact_memory",
1300                 .data           = &sysctl_compact_memory,
1301                 .maxlen         = sizeof(int),
1302                 .mode           = 0200,
1303                 .proc_handler   = sysctl_compaction_handler,
1304         },
1305         {
1306                 .procname       = "extfrag_threshold",
1307                 .data           = &sysctl_extfrag_threshold,
1308                 .maxlen         = sizeof(int),
1309                 .mode           = 0644,
1310                 .proc_handler   = sysctl_extfrag_handler,
1311                 .extra1         = &min_extfrag_threshold,
1312                 .extra2         = &max_extfrag_threshold,
1313         },
1314
1315 #endif /* CONFIG_COMPACTION */
1316         {
1317                 .procname       = "min_free_kbytes",
1318                 .data           = &min_free_kbytes,
1319                 .maxlen         = sizeof(min_free_kbytes),
1320                 .mode           = 0644,
1321                 .proc_handler   = min_free_kbytes_sysctl_handler,
1322                 .extra1         = &zero,
1323         },
1324         {
1325                 .procname       = "percpu_pagelist_fraction",
1326                 .data           = &percpu_pagelist_fraction,
1327                 .maxlen         = sizeof(percpu_pagelist_fraction),
1328                 .mode           = 0644,
1329                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1330                 .extra1         = &zero,
1331         },
1332 #ifdef CONFIG_MMU
1333         {
1334                 .procname       = "max_map_count",
1335                 .data           = &sysctl_max_map_count,
1336                 .maxlen         = sizeof(sysctl_max_map_count),
1337                 .mode           = 0644,
1338                 .proc_handler   = proc_dointvec_minmax,
1339                 .extra1         = &zero,
1340         },
1341 #else
1342         {
1343                 .procname       = "nr_trim_pages",
1344                 .data           = &sysctl_nr_trim_pages,
1345                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1346                 .mode           = 0644,
1347                 .proc_handler   = proc_dointvec_minmax,
1348                 .extra1         = &zero,
1349         },
1350 #endif
1351         {
1352                 .procname       = "laptop_mode",
1353                 .data           = &laptop_mode,
1354                 .maxlen         = sizeof(laptop_mode),
1355                 .mode           = 0644,
1356                 .proc_handler   = proc_dointvec_jiffies,
1357         },
1358         {
1359                 .procname       = "block_dump",
1360                 .data           = &block_dump,
1361                 .maxlen         = sizeof(block_dump),
1362                 .mode           = 0644,
1363                 .proc_handler   = proc_dointvec,
1364                 .extra1         = &zero,
1365         },
1366         {
1367                 .procname       = "vfs_cache_pressure",
1368                 .data           = &sysctl_vfs_cache_pressure,
1369                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1370                 .mode           = 0644,
1371                 .proc_handler   = proc_dointvec,
1372                 .extra1         = &zero,
1373         },
1374 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1375         {
1376                 .procname       = "legacy_va_layout",
1377                 .data           = &sysctl_legacy_va_layout,
1378                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1379                 .mode           = 0644,
1380                 .proc_handler   = proc_dointvec,
1381                 .extra1         = &zero,
1382         },
1383 #endif
1384 #ifdef CONFIG_NUMA
1385         {
1386                 .procname       = "zone_reclaim_mode",
1387                 .data           = &zone_reclaim_mode,
1388                 .maxlen         = sizeof(zone_reclaim_mode),
1389                 .mode           = 0644,
1390                 .proc_handler   = proc_dointvec,
1391                 .extra1         = &zero,
1392         },
1393         {
1394                 .procname       = "min_unmapped_ratio",
1395                 .data           = &sysctl_min_unmapped_ratio,
1396                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1397                 .mode           = 0644,
1398                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1399                 .extra1         = &zero,
1400                 .extra2         = &one_hundred,
1401         },
1402         {
1403                 .procname       = "min_slab_ratio",
1404                 .data           = &sysctl_min_slab_ratio,
1405                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1406                 .mode           = 0644,
1407                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1408                 .extra1         = &zero,
1409                 .extra2         = &one_hundred,
1410         },
1411 #endif
1412 #ifdef CONFIG_SMP
1413         {
1414                 .procname       = "stat_interval",
1415                 .data           = &sysctl_stat_interval,
1416                 .maxlen         = sizeof(sysctl_stat_interval),
1417                 .mode           = 0644,
1418                 .proc_handler   = proc_dointvec_jiffies,
1419         },
1420 #endif
1421 #ifdef CONFIG_MMU
1422         {
1423                 .procname       = "mmap_min_addr",
1424                 .data           = &dac_mmap_min_addr,
1425                 .maxlen         = sizeof(unsigned long),
1426                 .mode           = 0644,
1427                 .proc_handler   = mmap_min_addr_handler,
1428         },
1429 #endif
1430 #ifdef CONFIG_NUMA
1431         {
1432                 .procname       = "numa_zonelist_order",
1433                 .data           = &numa_zonelist_order,
1434                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1435                 .mode           = 0644,
1436                 .proc_handler   = numa_zonelist_order_handler,
1437         },
1438 #endif
1439 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1440    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1441         {
1442                 .procname       = "vdso_enabled",
1443 #ifdef CONFIG_X86_32
1444                 .data           = &vdso32_enabled,
1445                 .maxlen         = sizeof(vdso32_enabled),
1446 #else
1447                 .data           = &vdso_enabled,
1448                 .maxlen         = sizeof(vdso_enabled),
1449 #endif
1450                 .mode           = 0644,
1451                 .proc_handler   = proc_dointvec,
1452                 .extra1         = &zero,
1453         },
1454 #endif
1455 #ifdef CONFIG_HIGHMEM
1456         {
1457                 .procname       = "highmem_is_dirtyable",
1458                 .data           = &vm_highmem_is_dirtyable,
1459                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1460                 .mode           = 0644,
1461                 .proc_handler   = proc_dointvec_minmax,
1462                 .extra1         = &zero,
1463                 .extra2         = &one,
1464         },
1465 #endif
1466         {
1467                 .procname       = "scan_unevictable_pages",
1468                 .data           = &scan_unevictable_pages,
1469                 .maxlen         = sizeof(scan_unevictable_pages),
1470                 .mode           = 0644,
1471                 .proc_handler   = scan_unevictable_handler,
1472         },
1473 #ifdef CONFIG_MEMORY_FAILURE
1474         {
1475                 .procname       = "memory_failure_early_kill",
1476                 .data           = &sysctl_memory_failure_early_kill,
1477                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1478                 .mode           = 0644,
1479                 .proc_handler   = proc_dointvec_minmax,
1480                 .extra1         = &zero,
1481                 .extra2         = &one,
1482         },
1483         {
1484                 .procname       = "memory_failure_recovery",
1485                 .data           = &sysctl_memory_failure_recovery,
1486                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1487                 .mode           = 0644,
1488                 .proc_handler   = proc_dointvec_minmax,
1489                 .extra1         = &zero,
1490                 .extra2         = &one,
1491         },
1492 #endif
1493         {
1494                 .procname       = "user_reserve_kbytes",
1495                 .data           = &sysctl_user_reserve_kbytes,
1496                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1497                 .mode           = 0644,
1498                 .proc_handler   = proc_doulongvec_minmax,
1499         },
1500         {
1501                 .procname       = "admin_reserve_kbytes",
1502                 .data           = &sysctl_admin_reserve_kbytes,
1503                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1504                 .mode           = 0644,
1505                 .proc_handler   = proc_doulongvec_minmax,
1506         },
1507         { }
1508 };
1509
1510 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1511 static struct ctl_table binfmt_misc_table[] = {
1512         { }
1513 };
1514 #endif
1515
1516 static struct ctl_table fs_table[] = {
1517         {
1518                 .procname       = "inode-nr",
1519                 .data           = &inodes_stat,
1520                 .maxlen         = 2*sizeof(long),
1521                 .mode           = 0444,
1522                 .proc_handler   = proc_nr_inodes,
1523         },
1524         {
1525                 .procname       = "inode-state",
1526                 .data           = &inodes_stat,
1527                 .maxlen         = 7*sizeof(long),
1528                 .mode           = 0444,
1529                 .proc_handler   = proc_nr_inodes,
1530         },
1531         {
1532                 .procname       = "file-nr",
1533                 .data           = &files_stat,
1534                 .maxlen         = sizeof(files_stat),
1535                 .mode           = 0444,
1536                 .proc_handler   = proc_nr_files,
1537         },
1538         {
1539                 .procname       = "file-max",
1540                 .data           = &files_stat.max_files,
1541                 .maxlen         = sizeof(files_stat.max_files),
1542                 .mode           = 0644,
1543                 .proc_handler   = proc_doulongvec_minmax,
1544         },
1545         {
1546                 .procname       = "nr_open",
1547                 .data           = &sysctl_nr_open,
1548                 .maxlen         = sizeof(int),
1549                 .mode           = 0644,
1550                 .proc_handler   = proc_dointvec_minmax,
1551                 .extra1         = &sysctl_nr_open_min,
1552                 .extra2         = &sysctl_nr_open_max,
1553         },
1554         {
1555                 .procname       = "dentry-state",
1556                 .data           = &dentry_stat,
1557                 .maxlen         = 6*sizeof(long),
1558                 .mode           = 0444,
1559                 .proc_handler   = proc_nr_dentry,
1560         },
1561         {
1562                 .procname       = "overflowuid",
1563                 .data           = &fs_overflowuid,
1564                 .maxlen         = sizeof(int),
1565                 .mode           = 0644,
1566                 .proc_handler   = proc_dointvec_minmax,
1567                 .extra1         = &minolduid,
1568                 .extra2         = &maxolduid,
1569         },
1570         {
1571                 .procname       = "overflowgid",
1572                 .data           = &fs_overflowgid,
1573                 .maxlen         = sizeof(int),
1574                 .mode           = 0644,
1575                 .proc_handler   = proc_dointvec_minmax,
1576                 .extra1         = &minolduid,
1577                 .extra2         = &maxolduid,
1578         },
1579 #ifdef CONFIG_FILE_LOCKING
1580         {
1581                 .procname       = "leases-enable",
1582                 .data           = &leases_enable,
1583                 .maxlen         = sizeof(int),
1584                 .mode           = 0644,
1585                 .proc_handler   = proc_dointvec,
1586         },
1587 #endif
1588 #ifdef CONFIG_DNOTIFY
1589         {
1590                 .procname       = "dir-notify-enable",
1591                 .data           = &dir_notify_enable,
1592                 .maxlen         = sizeof(int),
1593                 .mode           = 0644,
1594                 .proc_handler   = proc_dointvec,
1595         },
1596 #endif
1597 #ifdef CONFIG_MMU
1598 #ifdef CONFIG_FILE_LOCKING
1599         {
1600                 .procname       = "lease-break-time",
1601                 .data           = &lease_break_time,
1602                 .maxlen         = sizeof(int),
1603                 .mode           = 0644,
1604                 .proc_handler   = proc_dointvec,
1605         },
1606 #endif
1607 #ifdef CONFIG_AIO
1608         {
1609                 .procname       = "aio-nr",
1610                 .data           = &aio_nr,
1611                 .maxlen         = sizeof(aio_nr),
1612                 .mode           = 0444,
1613                 .proc_handler   = proc_doulongvec_minmax,
1614         },
1615         {
1616                 .procname       = "aio-max-nr",
1617                 .data           = &aio_max_nr,
1618                 .maxlen         = sizeof(aio_max_nr),
1619                 .mode           = 0644,
1620                 .proc_handler   = proc_doulongvec_minmax,
1621         },
1622 #endif /* CONFIG_AIO */
1623 #ifdef CONFIG_INOTIFY_USER
1624         {
1625                 .procname       = "inotify",
1626                 .mode           = 0555,
1627                 .child          = inotify_table,
1628         },
1629 #endif
1630 #ifdef CONFIG_EPOLL
1631         {
1632                 .procname       = "epoll",
1633                 .mode           = 0555,
1634                 .child          = epoll_table,
1635         },
1636 #endif
1637 #endif
1638         {
1639                 .procname       = "protected_symlinks",
1640                 .data           = &sysctl_protected_symlinks,
1641                 .maxlen         = sizeof(int),
1642                 .mode           = 0600,
1643                 .proc_handler   = proc_dointvec_minmax,
1644                 .extra1         = &zero,
1645                 .extra2         = &one,
1646         },
1647         {
1648                 .procname       = "protected_hardlinks",
1649                 .data           = &sysctl_protected_hardlinks,
1650                 .maxlen         = sizeof(int),
1651                 .mode           = 0600,
1652                 .proc_handler   = proc_dointvec_minmax,
1653                 .extra1         = &zero,
1654                 .extra2         = &one,
1655         },
1656         {
1657                 .procname       = "suid_dumpable",
1658                 .data           = &suid_dumpable,
1659                 .maxlen         = sizeof(int),
1660                 .mode           = 0644,
1661                 .proc_handler   = proc_dointvec_minmax_coredump,
1662                 .extra1         = &zero,
1663                 .extra2         = &two,
1664         },
1665 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1666         {
1667                 .procname       = "binfmt_misc",
1668                 .mode           = 0555,
1669                 .child          = binfmt_misc_table,
1670         },
1671 #endif
1672         {
1673                 .procname       = "pipe-max-size",
1674                 .data           = &pipe_max_size,
1675                 .maxlen         = sizeof(int),
1676                 .mode           = 0644,
1677                 .proc_handler   = &pipe_proc_fn,
1678                 .extra1         = &pipe_min_size,
1679         },
1680         { }
1681 };
1682
1683 static struct ctl_table debug_table[] = {
1684 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1685         {
1686                 .procname       = "exception-trace",
1687                 .data           = &show_unhandled_signals,
1688                 .maxlen         = sizeof(int),
1689                 .mode           = 0644,
1690                 .proc_handler   = proc_dointvec
1691         },
1692 #endif
1693 #if defined(CONFIG_OPTPROBES)
1694         {
1695                 .procname       = "kprobes-optimization",
1696                 .data           = &sysctl_kprobes_optimization,
1697                 .maxlen         = sizeof(int),
1698                 .mode           = 0644,
1699                 .proc_handler   = proc_kprobes_optimization_handler,
1700                 .extra1         = &zero,
1701                 .extra2         = &one,
1702         },
1703 #endif
1704         { }
1705 };
1706
1707 static struct ctl_table dev_table[] = {
1708         { }
1709 };
1710
1711 int __init sysctl_init(void)
1712 {
1713         struct ctl_table_header *hdr;
1714
1715         hdr = register_sysctl_table(sysctl_base_table);
1716         kmemleak_not_leak(hdr);
1717         return 0;
1718 }
1719
1720 #endif /* CONFIG_SYSCTL */
1721
1722 /*
1723  * /proc/sys support
1724  */
1725
1726 #ifdef CONFIG_PROC_SYSCTL
1727
1728 static int _proc_do_string(char *data, int maxlen, int write,
1729                            char __user *buffer,
1730                            size_t *lenp, loff_t *ppos)
1731 {
1732         size_t len;
1733         char __user *p;
1734         char c;
1735
1736         if (!data || !maxlen || !*lenp) {
1737                 *lenp = 0;
1738                 return 0;
1739         }
1740
1741         if (write) {
1742                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1743                         /* Only continue writes not past the end of buffer. */
1744                         len = strlen(data);
1745                         if (len > maxlen - 1)
1746                                 len = maxlen - 1;
1747
1748                         if (*ppos > len)
1749                                 return 0;
1750                         len = *ppos;
1751                 } else {
1752                         /* Start writing from beginning of buffer. */
1753                         len = 0;
1754                 }
1755
1756                 *ppos += *lenp;
1757                 p = buffer;
1758                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1759                         if (get_user(c, p++))
1760                                 return -EFAULT;
1761                         if (c == 0 || c == '\n')
1762                                 break;
1763                         data[len++] = c;
1764                 }
1765                 data[len] = 0;
1766         } else {
1767                 len = strlen(data);
1768                 if (len > maxlen)
1769                         len = maxlen;
1770
1771                 if (*ppos > len) {
1772                         *lenp = 0;
1773                         return 0;
1774                 }
1775
1776                 data += *ppos;
1777                 len  -= *ppos;
1778
1779                 if (len > *lenp)
1780                         len = *lenp;
1781                 if (len)
1782                         if (copy_to_user(buffer, data, len))
1783                                 return -EFAULT;
1784                 if (len < *lenp) {
1785                         if (put_user('\n', buffer + len))
1786                                 return -EFAULT;
1787                         len++;
1788                 }
1789                 *lenp = len;
1790                 *ppos += len;
1791         }
1792         return 0;
1793 }
1794
1795 static void warn_sysctl_write(struct ctl_table *table)
1796 {
1797         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1798                 "This will not be supported in the future. To silence this\n"
1799                 "warning, set kernel.sysctl_writes_strict = -1\n",
1800                 current->comm, table->procname);
1801 }
1802
1803 /**
1804  * proc_dostring - read a string sysctl
1805  * @table: the sysctl table
1806  * @write: %TRUE if this is a write to the sysctl file
1807  * @buffer: the user buffer
1808  * @lenp: the size of the user buffer
1809  * @ppos: file position
1810  *
1811  * Reads/writes a string from/to the user buffer. If the kernel
1812  * buffer provided is not large enough to hold the string, the
1813  * string is truncated. The copied string is %NULL-terminated.
1814  * If the string is being read by the user process, it is copied
1815  * and a newline '\n' is added. It is truncated if the buffer is
1816  * not large enough.
1817  *
1818  * Returns 0 on success.
1819  */
1820 int proc_dostring(struct ctl_table *table, int write,
1821                   void __user *buffer, size_t *lenp, loff_t *ppos)
1822 {
1823         if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1824                 warn_sysctl_write(table);
1825
1826         return _proc_do_string((char *)(table->data), table->maxlen, write,
1827                                (char __user *)buffer, lenp, ppos);
1828 }
1829
1830 static size_t proc_skip_spaces(char **buf)
1831 {
1832         size_t ret;
1833         char *tmp = skip_spaces(*buf);
1834         ret = tmp - *buf;
1835         *buf = tmp;
1836         return ret;
1837 }
1838
1839 static void proc_skip_char(char **buf, size_t *size, const char v)
1840 {
1841         while (*size) {
1842                 if (**buf != v)
1843                         break;
1844                 (*size)--;
1845                 (*buf)++;
1846         }
1847 }
1848
1849 #define TMPBUFLEN 22
1850 /**
1851  * proc_get_long - reads an ASCII formatted integer from a user buffer
1852  *
1853  * @buf: a kernel buffer
1854  * @size: size of the kernel buffer
1855  * @val: this is where the number will be stored
1856  * @neg: set to %TRUE if number is negative
1857  * @perm_tr: a vector which contains the allowed trailers
1858  * @perm_tr_len: size of the perm_tr vector
1859  * @tr: pointer to store the trailer character
1860  *
1861  * In case of success %0 is returned and @buf and @size are updated with
1862  * the amount of bytes read. If @tr is non-NULL and a trailing
1863  * character exists (size is non-zero after returning from this
1864  * function), @tr is updated with the trailing character.
1865  */
1866 static int proc_get_long(char **buf, size_t *size,
1867                           unsigned long *val, bool *neg,
1868                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1869 {
1870         int len;
1871         char *p, tmp[TMPBUFLEN];
1872
1873         if (!*size)
1874                 return -EINVAL;
1875
1876         len = *size;
1877         if (len > TMPBUFLEN - 1)
1878                 len = TMPBUFLEN - 1;
1879
1880         memcpy(tmp, *buf, len);
1881
1882         tmp[len] = 0;
1883         p = tmp;
1884         if (*p == '-' && *size > 1) {
1885                 *neg = true;
1886                 p++;
1887         } else
1888                 *neg = false;
1889         if (!isdigit(*p))
1890                 return -EINVAL;
1891
1892         *val = simple_strtoul(p, &p, 0);
1893
1894         len = p - tmp;
1895
1896         /* We don't know if the next char is whitespace thus we may accept
1897          * invalid integers (e.g. 1234...a) or two integers instead of one
1898          * (e.g. 123...1). So lets not allow such large numbers. */
1899         if (len == TMPBUFLEN - 1)
1900                 return -EINVAL;
1901
1902         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1903                 return -EINVAL;
1904
1905         if (tr && (len < *size))
1906                 *tr = *p;
1907
1908         *buf += len;
1909         *size -= len;
1910
1911         return 0;
1912 }
1913
1914 /**
1915  * proc_put_long - converts an integer to a decimal ASCII formatted string
1916  *
1917  * @buf: the user buffer
1918  * @size: the size of the user buffer
1919  * @val: the integer to be converted
1920  * @neg: sign of the number, %TRUE for negative
1921  *
1922  * In case of success %0 is returned and @buf and @size are updated with
1923  * the amount of bytes written.
1924  */
1925 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1926                           bool neg)
1927 {
1928         int len;
1929         char tmp[TMPBUFLEN], *p = tmp;
1930
1931         sprintf(p, "%s%lu", neg ? "-" : "", val);
1932         len = strlen(tmp);
1933         if (len > *size)
1934                 len = *size;
1935         if (copy_to_user(*buf, tmp, len))
1936                 return -EFAULT;
1937         *size -= len;
1938         *buf += len;
1939         return 0;
1940 }
1941 #undef TMPBUFLEN
1942
1943 static int proc_put_char(void __user **buf, size_t *size, char c)
1944 {
1945         if (*size) {
1946                 char __user **buffer = (char __user **)buf;
1947                 if (put_user(c, *buffer))
1948                         return -EFAULT;
1949                 (*size)--, (*buffer)++;
1950                 *buf = *buffer;
1951         }
1952         return 0;
1953 }
1954
1955 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1956                                  int *valp,
1957                                  int write, void *data)
1958 {
1959         if (write) {
1960                 *valp = *negp ? -*lvalp : *lvalp;
1961         } else {
1962                 int val = *valp;
1963                 if (val < 0) {
1964                         *negp = true;
1965                         *lvalp = (unsigned long)-val;
1966                 } else {
1967                         *negp = false;
1968                         *lvalp = (unsigned long)val;
1969                 }
1970         }
1971         return 0;
1972 }
1973
1974 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1975
1976 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1977                   int write, void __user *buffer,
1978                   size_t *lenp, loff_t *ppos,
1979                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1980                               int write, void *data),
1981                   void *data)
1982 {
1983         int *i, vleft, first = 1, err = 0;
1984         unsigned long page = 0;
1985         size_t left;
1986         char *kbuf;
1987
1988         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1989                 *lenp = 0;
1990                 return 0;
1991         }
1992
1993         i = (int *) tbl_data;
1994         vleft = table->maxlen / sizeof(*i);
1995         left = *lenp;
1996
1997         if (!conv)
1998                 conv = do_proc_dointvec_conv;
1999
2000         if (write) {
2001                 if (*ppos) {
2002                         switch (sysctl_writes_strict) {
2003                         case SYSCTL_WRITES_STRICT:
2004                                 goto out;
2005                         case SYSCTL_WRITES_WARN:
2006                                 warn_sysctl_write(table);
2007                                 break;
2008                         default:
2009                                 break;
2010                         }
2011                 }
2012
2013                 if (left > PAGE_SIZE - 1)
2014                         left = PAGE_SIZE - 1;
2015                 page = __get_free_page(GFP_TEMPORARY);
2016                 kbuf = (char *) page;
2017                 if (!kbuf)
2018                         return -ENOMEM;
2019                 if (copy_from_user(kbuf, buffer, left)) {
2020                         err = -EFAULT;
2021                         goto free;
2022                 }
2023                 kbuf[left] = 0;
2024         }
2025
2026         for (; left && vleft--; i++, first=0) {
2027                 unsigned long lval;
2028                 bool neg;
2029
2030                 if (write) {
2031                         left -= proc_skip_spaces(&kbuf);
2032
2033                         if (!left)
2034                                 break;
2035                         err = proc_get_long(&kbuf, &left, &lval, &neg,
2036                                              proc_wspace_sep,
2037                                              sizeof(proc_wspace_sep), NULL);
2038                         if (err)
2039                                 break;
2040                         if (conv(&neg, &lval, i, 1, data)) {
2041                                 err = -EINVAL;
2042                                 break;
2043                         }
2044                 } else {
2045                         if (conv(&neg, &lval, i, 0, data)) {
2046                                 err = -EINVAL;
2047                                 break;
2048                         }
2049                         if (!first)
2050                                 err = proc_put_char(&buffer, &left, '\t');
2051                         if (err)
2052                                 break;
2053                         err = proc_put_long(&buffer, &left, lval, neg);
2054                         if (err)
2055                                 break;
2056                 }
2057         }
2058
2059         if (!write && !first && left && !err)
2060                 err = proc_put_char(&buffer, &left, '\n');
2061         if (write && !err && left)
2062                 left -= proc_skip_spaces(&kbuf);
2063 free:
2064         if (write) {
2065                 free_page(page);
2066                 if (first)
2067                         return err ? : -EINVAL;
2068         }
2069         *lenp -= left;
2070 out:
2071         *ppos += *lenp;
2072         return err;
2073 }
2074
2075 static int do_proc_dointvec(struct ctl_table *table, int write,
2076                   void __user *buffer, size_t *lenp, loff_t *ppos,
2077                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2078                               int write, void *data),
2079                   void *data)
2080 {
2081         return __do_proc_dointvec(table->data, table, write,
2082                         buffer, lenp, ppos, conv, data);
2083 }
2084
2085 /**
2086  * proc_dointvec - read a vector of integers
2087  * @table: the sysctl table
2088  * @write: %TRUE if this is a write to the sysctl file
2089  * @buffer: the user buffer
2090  * @lenp: the size of the user buffer
2091  * @ppos: file position
2092  *
2093  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2094  * values from/to the user buffer, treated as an ASCII string.
2095  *
2096  * Returns 0 on success.
2097  */
2098 int proc_dointvec(struct ctl_table *table, int write,
2099                      void __user *buffer, size_t *lenp, loff_t *ppos)
2100 {
2101     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2102                             NULL,NULL);
2103 }
2104
2105 /*
2106  * Taint values can only be increased
2107  * This means we can safely use a temporary.
2108  */
2109 static int proc_taint(struct ctl_table *table, int write,
2110                                void __user *buffer, size_t *lenp, loff_t *ppos)
2111 {
2112         struct ctl_table t;
2113         unsigned long tmptaint = get_taint();
2114         int err;
2115
2116         if (write && !capable(CAP_SYS_ADMIN))
2117                 return -EPERM;
2118
2119         t = *table;
2120         t.data = &tmptaint;
2121         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2122         if (err < 0)
2123                 return err;
2124
2125         if (write) {
2126                 /*
2127                  * Poor man's atomic or. Not worth adding a primitive
2128                  * to everyone's atomic.h for this
2129                  */
2130                 int i;
2131                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2132                         if ((tmptaint >> i) & 1)
2133                                 add_taint(i, LOCKDEP_STILL_OK);
2134                 }
2135         }
2136
2137         return err;
2138 }
2139
2140 #ifdef CONFIG_PRINTK
2141 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2142                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2143 {
2144         if (write && !capable(CAP_SYS_ADMIN))
2145                 return -EPERM;
2146
2147         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2148 }
2149 #endif
2150
2151 struct do_proc_dointvec_minmax_conv_param {
2152         int *min;
2153         int *max;
2154 };
2155
2156 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2157                                         int *valp,
2158                                         int write, void *data)
2159 {
2160         struct do_proc_dointvec_minmax_conv_param *param = data;
2161         if (write) {
2162                 int val = *negp ? -*lvalp : *lvalp;
2163                 if ((param->min && *param->min > val) ||
2164                     (param->max && *param->max < val))
2165                         return -EINVAL;
2166                 *valp = val;
2167         } else {
2168                 int val = *valp;
2169                 if (val < 0) {
2170                         *negp = true;
2171                         *lvalp = (unsigned long)-val;
2172                 } else {
2173                         *negp = false;
2174                         *lvalp = (unsigned long)val;
2175                 }
2176         }
2177         return 0;
2178 }
2179
2180 /**
2181  * proc_dointvec_minmax - read a vector of integers with min/max values
2182  * @table: the sysctl table
2183  * @write: %TRUE if this is a write to the sysctl file
2184  * @buffer: the user buffer
2185  * @lenp: the size of the user buffer
2186  * @ppos: file position
2187  *
2188  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2189  * values from/to the user buffer, treated as an ASCII string.
2190  *
2191  * This routine will ensure the values are within the range specified by
2192  * table->extra1 (min) and table->extra2 (max).
2193  *
2194  * Returns 0 on success.
2195  */
2196 int proc_dointvec_minmax(struct ctl_table *table, int write,
2197                   void __user *buffer, size_t *lenp, loff_t *ppos)
2198 {
2199         struct do_proc_dointvec_minmax_conv_param param = {
2200                 .min = (int *) table->extra1,
2201                 .max = (int *) table->extra2,
2202         };
2203         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2204                                 do_proc_dointvec_minmax_conv, &param);
2205 }
2206
2207 static void validate_coredump_safety(void)
2208 {
2209 #ifdef CONFIG_COREDUMP
2210         if (suid_dumpable == SUID_DUMP_ROOT &&
2211             core_pattern[0] != '/' && core_pattern[0] != '|') {
2212                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2213                         "suid_dumpable=2. Pipe handler or fully qualified "\
2214                         "core dump path required.\n");
2215         }
2216 #endif
2217 }
2218
2219 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2220                 void __user *buffer, size_t *lenp, loff_t *ppos)
2221 {
2222         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2223         if (!error)
2224                 validate_coredump_safety();
2225         return error;
2226 }
2227
2228 #ifdef CONFIG_COREDUMP
2229 static int proc_dostring_coredump(struct ctl_table *table, int write,
2230                   void __user *buffer, size_t *lenp, loff_t *ppos)
2231 {
2232         int error = proc_dostring(table, write, buffer, lenp, ppos);
2233         if (!error)
2234                 validate_coredump_safety();
2235         return error;
2236 }
2237 #endif
2238
2239 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2240                                      void __user *buffer,
2241                                      size_t *lenp, loff_t *ppos,
2242                                      unsigned long convmul,
2243                                      unsigned long convdiv)
2244 {
2245         unsigned long *i, *min, *max;
2246         int vleft, first = 1, err = 0;
2247         unsigned long page = 0;
2248         size_t left;
2249         char *kbuf;
2250
2251         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2252                 *lenp = 0;
2253                 return 0;
2254         }
2255
2256         i = (unsigned long *) data;
2257         min = (unsigned long *) table->extra1;
2258         max = (unsigned long *) table->extra2;
2259         vleft = table->maxlen / sizeof(unsigned long);
2260         left = *lenp;
2261
2262         if (write) {
2263                 if (*ppos) {
2264                         switch (sysctl_writes_strict) {
2265                         case SYSCTL_WRITES_STRICT:
2266                                 goto out;
2267                         case SYSCTL_WRITES_WARN:
2268                                 warn_sysctl_write(table);
2269                                 break;
2270                         default:
2271                                 break;
2272                         }
2273                 }
2274
2275                 if (left > PAGE_SIZE - 1)
2276                         left = PAGE_SIZE - 1;
2277                 page = __get_free_page(GFP_TEMPORARY);
2278                 kbuf = (char *) page;
2279                 if (!kbuf)
2280                         return -ENOMEM;
2281                 if (copy_from_user(kbuf, buffer, left)) {
2282                         err = -EFAULT;
2283                         goto free;
2284                 }
2285                 kbuf[left] = 0;
2286         }
2287
2288         for (; left && vleft--; i++, first = 0) {
2289                 unsigned long val;
2290
2291                 if (write) {
2292                         bool neg;
2293
2294                         left -= proc_skip_spaces(&kbuf);
2295
2296                         err = proc_get_long(&kbuf, &left, &val, &neg,
2297                                              proc_wspace_sep,
2298                                              sizeof(proc_wspace_sep), NULL);
2299                         if (err)
2300                                 break;
2301                         if (neg)
2302                                 continue;
2303                         if ((min && val < *min) || (max && val > *max))
2304                                 continue;
2305                         *i = val;
2306                 } else {
2307                         val = convdiv * (*i) / convmul;
2308                         if (!first) {
2309                                 err = proc_put_char(&buffer, &left, '\t');
2310                                 if (err)
2311                                         break;
2312                         }
2313                         err = proc_put_long(&buffer, &left, val, false);
2314                         if (err)
2315                                 break;
2316                 }
2317         }
2318
2319         if (!write && !first && left && !err)
2320                 err = proc_put_char(&buffer, &left, '\n');
2321         if (write && !err)
2322                 left -= proc_skip_spaces(&kbuf);
2323 free:
2324         if (write) {
2325                 free_page(page);
2326                 if (first)
2327                         return err ? : -EINVAL;
2328         }
2329         *lenp -= left;
2330 out:
2331         *ppos += *lenp;
2332         return err;
2333 }
2334
2335 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2336                                      void __user *buffer,
2337                                      size_t *lenp, loff_t *ppos,
2338                                      unsigned long convmul,
2339                                      unsigned long convdiv)
2340 {
2341         return __do_proc_doulongvec_minmax(table->data, table, write,
2342                         buffer, lenp, ppos, convmul, convdiv);
2343 }
2344
2345 /**
2346  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2347  * @table: the sysctl table
2348  * @write: %TRUE if this is a write to the sysctl file
2349  * @buffer: the user buffer
2350  * @lenp: the size of the user buffer
2351  * @ppos: file position
2352  *
2353  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2354  * values from/to the user buffer, treated as an ASCII string.
2355  *
2356  * This routine will ensure the values are within the range specified by
2357  * table->extra1 (min) and table->extra2 (max).
2358  *
2359  * Returns 0 on success.
2360  */
2361 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2362                            void __user *buffer, size_t *lenp, loff_t *ppos)
2363 {
2364     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2365 }
2366
2367 /**
2368  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2369  * @table: the sysctl table
2370  * @write: %TRUE if this is a write to the sysctl file
2371  * @buffer: the user buffer
2372  * @lenp: the size of the user buffer
2373  * @ppos: file position
2374  *
2375  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2376  * values from/to the user buffer, treated as an ASCII string. The values
2377  * are treated as milliseconds, and converted to jiffies when they are stored.
2378  *
2379  * This routine will ensure the values are within the range specified by
2380  * table->extra1 (min) and table->extra2 (max).
2381  *
2382  * Returns 0 on success.
2383  */
2384 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2385                                       void __user *buffer,
2386                                       size_t *lenp, loff_t *ppos)
2387 {
2388     return do_proc_doulongvec_minmax(table, write, buffer,
2389                                      lenp, ppos, HZ, 1000l);
2390 }
2391
2392
2393 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2394                                          int *valp,
2395                                          int write, void *data)
2396 {
2397         if (write) {
2398                 if (*lvalp > LONG_MAX / HZ)
2399                         return 1;
2400                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2401         } else {
2402                 int val = *valp;
2403                 unsigned long lval;
2404                 if (val < 0) {
2405                         *negp = true;
2406                         lval = (unsigned long)-val;
2407                 } else {
2408                         *negp = false;
2409                         lval = (unsigned long)val;
2410                 }
2411                 *lvalp = lval / HZ;
2412         }
2413         return 0;
2414 }
2415
2416 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2417                                                 int *valp,
2418                                                 int write, void *data)
2419 {
2420         if (write) {
2421                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2422                         return 1;
2423                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2424         } else {
2425                 int val = *valp;
2426                 unsigned long lval;
2427                 if (val < 0) {
2428                         *negp = true;
2429                         lval = (unsigned long)-val;
2430                 } else {
2431                         *negp = false;
2432                         lval = (unsigned long)val;
2433                 }
2434                 *lvalp = jiffies_to_clock_t(lval);
2435         }
2436         return 0;
2437 }
2438
2439 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2440                                             int *valp,
2441                                             int write, void *data)
2442 {
2443         if (write) {
2444                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2445
2446                 if (jif > INT_MAX)
2447                         return 1;
2448                 *valp = (int)jif;
2449         } else {
2450                 int val = *valp;
2451                 unsigned long lval;
2452                 if (val < 0) {
2453                         *negp = true;
2454                         lval = (unsigned long)-val;
2455                 } else {
2456                         *negp = false;
2457                         lval = (unsigned long)val;
2458                 }
2459                 *lvalp = jiffies_to_msecs(lval);
2460         }
2461         return 0;
2462 }
2463
2464 /**
2465  * proc_dointvec_jiffies - read a vector of integers as seconds
2466  * @table: the sysctl table
2467  * @write: %TRUE if this is a write to the sysctl file
2468  * @buffer: the user buffer
2469  * @lenp: the size of the user buffer
2470  * @ppos: file position
2471  *
2472  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2473  * values from/to the user buffer, treated as an ASCII string.
2474  * The values read are assumed to be in seconds, and are converted into
2475  * jiffies.
2476  *
2477  * Returns 0 on success.
2478  */
2479 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2480                           void __user *buffer, size_t *lenp, loff_t *ppos)
2481 {
2482     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2483                             do_proc_dointvec_jiffies_conv,NULL);
2484 }
2485
2486 /**
2487  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2488  * @table: the sysctl table
2489  * @write: %TRUE if this is a write to the sysctl file
2490  * @buffer: the user buffer
2491  * @lenp: the size of the user buffer
2492  * @ppos: pointer to the file position
2493  *
2494  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2495  * values from/to the user buffer, treated as an ASCII string.
2496  * The values read are assumed to be in 1/USER_HZ seconds, and
2497  * are converted into jiffies.
2498  *
2499  * Returns 0 on success.
2500  */
2501 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2502                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2503 {
2504     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2505                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2506 }
2507
2508 /**
2509  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2510  * @table: the sysctl table
2511  * @write: %TRUE if this is a write to the sysctl file
2512  * @buffer: the user buffer
2513  * @lenp: the size of the user buffer
2514  * @ppos: file position
2515  * @ppos: the current position in the file
2516  *
2517  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2518  * values from/to the user buffer, treated as an ASCII string.
2519  * The values read are assumed to be in 1/1000 seconds, and
2520  * are converted into jiffies.
2521  *
2522  * Returns 0 on success.
2523  */
2524 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2525                              void __user *buffer, size_t *lenp, loff_t *ppos)
2526 {
2527         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2528                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2529 }
2530
2531 static int proc_do_cad_pid(struct ctl_table *table, int write,
2532                            void __user *buffer, size_t *lenp, loff_t *ppos)
2533 {
2534         struct pid *new_pid;
2535         pid_t tmp;
2536         int r;
2537
2538         tmp = pid_vnr(cad_pid);
2539
2540         r = __do_proc_dointvec(&tmp, table, write, buffer,
2541                                lenp, ppos, NULL, NULL);
2542         if (r || !write)
2543                 return r;
2544
2545         new_pid = find_get_pid(tmp);
2546         if (!new_pid)
2547                 return -ESRCH;
2548
2549         put_pid(xchg(&cad_pid, new_pid));
2550         return 0;
2551 }
2552
2553 /**
2554  * proc_do_large_bitmap - read/write from/to a large bitmap
2555  * @table: the sysctl table
2556  * @write: %TRUE if this is a write to the sysctl file
2557  * @buffer: the user buffer
2558  * @lenp: the size of the user buffer
2559  * @ppos: file position
2560  *
2561  * The bitmap is stored at table->data and the bitmap length (in bits)
2562  * in table->maxlen.
2563  *
2564  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2565  * large bitmaps may be represented in a compact manner. Writing into
2566  * the file will clear the bitmap then update it with the given input.
2567  *
2568  * Returns 0 on success.
2569  */
2570 int proc_do_large_bitmap(struct ctl_table *table, int write,
2571                          void __user *buffer, size_t *lenp, loff_t *ppos)
2572 {
2573         int err = 0;
2574         bool first = 1;
2575         size_t left = *lenp;
2576         unsigned long bitmap_len = table->maxlen;
2577         unsigned long *bitmap = *(unsigned long **) table->data;
2578         unsigned long *tmp_bitmap = NULL;
2579         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2580
2581         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2582                 *lenp = 0;
2583                 return 0;
2584         }
2585
2586         if (write) {
2587                 unsigned long page = 0;
2588                 char *kbuf;
2589
2590                 if (left > PAGE_SIZE - 1)
2591                         left = PAGE_SIZE - 1;
2592
2593                 page = __get_free_page(GFP_TEMPORARY);
2594                 kbuf = (char *) page;
2595                 if (!kbuf)
2596                         return -ENOMEM;
2597                 if (copy_from_user(kbuf, buffer, left)) {
2598                         free_page(page);
2599                         return -EFAULT;
2600                 }
2601                 kbuf[left] = 0;
2602
2603                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2604                                      GFP_KERNEL);
2605                 if (!tmp_bitmap) {
2606                         free_page(page);
2607                         return -ENOMEM;
2608                 }
2609                 proc_skip_char(&kbuf, &left, '\n');
2610                 while (!err && left) {
2611                         unsigned long val_a, val_b;
2612                         bool neg;
2613
2614                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2615                                              sizeof(tr_a), &c);
2616                         if (err)
2617                                 break;
2618                         if (val_a >= bitmap_len || neg) {
2619                                 err = -EINVAL;
2620                                 break;
2621                         }
2622
2623                         val_b = val_a;
2624                         if (left) {
2625                                 kbuf++;
2626                                 left--;
2627                         }
2628
2629                         if (c == '-') {
2630                                 err = proc_get_long(&kbuf, &left, &val_b,
2631                                                      &neg, tr_b, sizeof(tr_b),
2632                                                      &c);
2633                                 if (err)
2634                                         break;
2635                                 if (val_b >= bitmap_len || neg ||
2636                                     val_a > val_b) {
2637                                         err = -EINVAL;
2638                                         break;
2639                                 }
2640                                 if (left) {
2641                                         kbuf++;
2642                                         left--;
2643                                 }
2644                         }
2645
2646                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2647                         first = 0;
2648                         proc_skip_char(&kbuf, &left, '\n');
2649                 }
2650                 free_page(page);
2651         } else {
2652                 unsigned long bit_a, bit_b = 0;
2653
2654                 while (left) {
2655                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2656                         if (bit_a >= bitmap_len)
2657                                 break;
2658                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2659                                                    bit_a + 1) - 1;
2660
2661                         if (!first) {
2662                                 err = proc_put_char(&buffer, &left, ',');
2663                                 if (err)
2664                                         break;
2665                         }
2666                         err = proc_put_long(&buffer, &left, bit_a, false);
2667                         if (err)
2668                                 break;
2669                         if (bit_a != bit_b) {
2670                                 err = proc_put_char(&buffer, &left, '-');
2671                                 if (err)
2672                                         break;
2673                                 err = proc_put_long(&buffer, &left, bit_b, false);
2674                                 if (err)
2675                                         break;
2676                         }
2677
2678                         first = 0; bit_b++;
2679                 }
2680                 if (!err)
2681                         err = proc_put_char(&buffer, &left, '\n');
2682         }
2683
2684         if (!err) {
2685                 if (write) {
2686                         if (*ppos)
2687                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2688                         else
2689                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2690                 }
2691                 kfree(tmp_bitmap);
2692                 *lenp -= left;
2693                 *ppos += *lenp;
2694                 return 0;
2695         } else {
2696                 kfree(tmp_bitmap);
2697                 return err;
2698         }
2699 }
2700
2701 #else /* CONFIG_PROC_SYSCTL */
2702
2703 int proc_dostring(struct ctl_table *table, int write,
2704                   void __user *buffer, size_t *lenp, loff_t *ppos)
2705 {
2706         return -ENOSYS;
2707 }
2708
2709 int proc_dointvec(struct ctl_table *table, int write,
2710                   void __user *buffer, size_t *lenp, loff_t *ppos)
2711 {
2712         return -ENOSYS;
2713 }
2714
2715 int proc_dointvec_minmax(struct ctl_table *table, int write,
2716                     void __user *buffer, size_t *lenp, loff_t *ppos)
2717 {
2718         return -ENOSYS;
2719 }
2720
2721 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2722                     void __user *buffer, size_t *lenp, loff_t *ppos)
2723 {
2724         return -ENOSYS;
2725 }
2726
2727 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2728                     void __user *buffer, size_t *lenp, loff_t *ppos)
2729 {
2730         return -ENOSYS;
2731 }
2732
2733 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2734                              void __user *buffer, size_t *lenp, loff_t *ppos)
2735 {
2736         return -ENOSYS;
2737 }
2738
2739 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2740                     void __user *buffer, size_t *lenp, loff_t *ppos)
2741 {
2742         return -ENOSYS;
2743 }
2744
2745 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2746                                       void __user *buffer,
2747                                       size_t *lenp, loff_t *ppos)
2748 {
2749     return -ENOSYS;
2750 }
2751
2752
2753 #endif /* CONFIG_PROC_SYSCTL */
2754
2755 /*
2756  * No sense putting this after each symbol definition, twice,
2757  * exception granted :-)
2758  */
2759 EXPORT_SYMBOL(proc_dointvec);
2760 EXPORT_SYMBOL(proc_dointvec_jiffies);
2761 EXPORT_SYMBOL(proc_dointvec_minmax);
2762 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2763 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2764 EXPORT_SYMBOL(proc_dostring);
2765 EXPORT_SYMBOL(proc_doulongvec_minmax);
2766 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);