kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/aio.h>
  23 #include <linux/mm.h>
  24 #include <linux/swap.h>
  25 #include <linux/slab.h>
  26 #include <linux/sysctl.h>
  27 #include <linux/bitmap.h>
  28 #include <linux/signal.h>
  29 #include <linux/printk.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/security.h>
  32 #include <linux/ctype.h>
  33 #include <linux/kmemcheck.h>
  34 #include <linux/kmemleak.h>
  35 #include <linux/fs.h>
  36 #include <linux/init.h>
  37 #include <linux/kernel.h>
  38 #include <linux/kobject.h>
  39 #include <linux/net.h>
  40 #include <linux/sysrq.h>
  41 #include <linux/highuid.h>
  42 #include <linux/writeback.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/compaction.h>
  45 #include <linux/hugetlb.h>
  46 #include <linux/initrd.h>
  47 #include <linux/key.h>
  48 #include <linux/times.h>
  49 #include <linux/limits.h>
  50 #include <linux/dcache.h>
  51 #include <linux/dnotify.h>
  52 #include <linux/syscalls.h>
  53 #include <linux/vmstat.h>
  54 #include <linux/nfs_fs.h>
  55 #include <linux/acpi.h>
  56 #include <linux/reboot.h>
  57 #include <linux/ftrace.h>
  58 #include <linux/perf_event.h>
  59 #include <linux/kprobes.h>
  60 #include <linux/pipe_fs_i.h>
  61 #include <linux/oom.h>
  62 #include <linux/kmod.h>
  63 #include <linux/capability.h>
  64 #include <linux/binfmts.h>
  65 #include <linux/sched/sysctl.h>
  66 #include <linux/kexec.h>
  67
  68 #include <asm/uaccess.h>
  69 #include <asm/processor.h>
  70
  71 #ifdef CONFIG_X86
  72 #include <asm/nmi.h>
  73 #include <asm/stacktrace.h>
  74 #include <asm/io.h>
  75 #endif
  76 #ifdef CONFIG_SPARC
  77 #include <asm/setup.h>
  78 #endif
  79 #ifdef CONFIG_BSD_PROCESS_ACCT
  80 #include <linux/acct.h>
  81 #endif
  82 #ifdef CONFIG_RT_MUTEXES
  83 #include <linux/rtmutex.h>
  84 #endif
  85 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  86 #include <linux/lockdep.h>
  87 #endif
  88 #ifdef CONFIG_CHR_DEV_SG
  89 #include <scsi/sg.h>
  90 #endif
  91
  92 #ifdef CONFIG_LOCKUP_DETECTOR
  93 #include <linux/nmi.h>
  94 #endif
  95
  96 #if defined(CONFIG_SYSCTL)
  97
  98 /* External variables not in a header file. */
  99 extern int suid_dumpable;
 100 #ifdef CONFIG_COREDUMP
 101 extern int core_uses_pid;
 102 extern char core_pattern[];
 103 extern unsigned int core_pipe_limit;
 104 #endif
 105 extern int pid_max;
 106 extern int pid_max_min, pid_max_max;
 107 extern int percpu_pagelist_fraction;
 108 extern int compat_log;
 109 extern int latencytop_enabled;
 110 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 111 #ifndef CONFIG_MMU
 112 extern int sysctl_nr_trim_pages;
 113 #endif
 114
 115 /* Constants used for minimum and  maximum */
 116 #ifdef CONFIG_LOCKUP_DETECTOR
 117 static int sixty = 60;
 118 #endif
 119
 120 static int __maybe_unused neg_one = -1;
 121
 122 static int zero;
 123 static int __maybe_unused one = 1;
 124 static int __maybe_unused two = 2;
 125 static int __maybe_unused four = 4;
 126 static unsigned long one_ul = 1;
 127 static int one_hundred = 100;
 128 #ifdef CONFIG_PRINTK
 129 static int ten_thousand = 10000;
 130 #endif
 131
 132 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 133 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 134
 135 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 136 static int maxolduid = 65535;
 137 static int minolduid;
 138
 139 static int ngroups_max = NGROUPS_MAX;
 140 static const int cap_last_cap = CAP_LAST_CAP;
 141
 142 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
 143 #ifdef CONFIG_DETECT_HUNG_TASK
 144 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 145 #endif
 146
 147 #ifdef CONFIG_INOTIFY_USER
 148 #include <linux/inotify.h>
 149 #endif
 150 #ifdef CONFIG_SPARC
 151 #endif
 152
 153 #ifdef __hppa__
 154 extern int pwrsw_enabled;
 155 #endif
 156
 157 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 158 extern int unaligned_enabled;
 159 #endif
 160
 161 #ifdef CONFIG_IA64
 162 extern int unaligned_dump_stack;
 163 #endif
 164
 165 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 166 extern int no_unaligned_warning;
 167 #endif
 168
 169 #ifdef CONFIG_PROC_SYSCTL
 170
 171 #define SYSCTL_WRITES_LEGACY    -1
 172 #define SYSCTL_WRITES_WARN       0
 173 #define SYSCTL_WRITES_STRICT     1
 174
 175 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
 176
 177 static int proc_do_cad_pid(struct ctl_table *table, int write,
 178                   void __user *buffer, size_t *lenp, loff_t *ppos);
 179 static int proc_taint(struct ctl_table *table, int write,
 180                                void __user *buffer, size_t *lenp, loff_t *ppos);
 181 #endif
 182
 183 #ifdef CONFIG_PRINTK
 184 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 185                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 186 #endif
 187
 188 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 189                 void __user *buffer, size_t *lenp, loff_t *ppos);
 190 #ifdef CONFIG_COREDUMP
 191 static int proc_dostring_coredump(struct ctl_table *table, int write,
 192                 void __user *buffer, size_t *lenp, loff_t *ppos);
 193 #endif
 194
 195 #ifdef CONFIG_MAGIC_SYSRQ
 196 /* Note: sysrq code uses it's own private copy */
 197 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 198
 199 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 200                                 void __user *buffer, size_t *lenp,
 201                                 loff_t *ppos)
 202 {
 203         int error;
 204
 205         error = proc_dointvec(table, write, buffer, lenp, ppos);
 206         if (error)
 207                 return error;
 208
 209         if (write)
 210                 sysrq_toggle_support(__sysrq_enabled);
 211
 212         return 0;
 213 }
 214
 215 #endif
 216
 217 static struct ctl_table kern_table[];
 218 static struct ctl_table vm_table[];
 219 static struct ctl_table fs_table[];
 220 static struct ctl_table debug_table[];
 221 static struct ctl_table dev_table[];
 222 extern struct ctl_table random_table[];
 223 #ifdef CONFIG_EPOLL
 224 extern struct ctl_table epoll_table[];
 225 #endif
 226
 227 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 228 int sysctl_legacy_va_layout;
 229 #endif
 230
 231 /* The default sysctl tables: */
 232
 233 static struct ctl_table sysctl_base_table[] = {
 234         {
 235                 .procname       = "kernel",
 236                 .mode           = 0555,
 237                 .child          = kern_table,
 238         },
 239         {
 240                 .procname       = "vm",
 241                 .mode           = 0555,
 242                 .child          = vm_table,
 243         },
 244         {
 245                 .procname       = "fs",
 246                 .mode           = 0555,
 247                 .child          = fs_table,
 248         },
 249         {
 250                 .procname       = "debug",
 251                 .mode           = 0555,
 252                 .child          = debug_table,
 253         },
 254         {
 255                 .procname       = "dev",
 256                 .mode           = 0555,
 257                 .child          = dev_table,
 258         },
 259         { }
 260 };
 261
 262 #ifdef CONFIG_SCHED_DEBUG
 263 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 264 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 265 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 266 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 267 #ifdef CONFIG_SMP
 268 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 269 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 270 #endif /* CONFIG_SMP */
 271 #endif /* CONFIG_SCHED_DEBUG */
 272
 273 #ifdef CONFIG_COMPACTION
 274 static int min_extfrag_threshold;
 275 static int max_extfrag_threshold = 1000;
 276 #endif
 277
 278 static struct ctl_table kern_table[] = {
 279         {
 280                 .procname       = "sched_child_runs_first",
 281                 .data           = &sysctl_sched_child_runs_first,
 282                 .maxlen         = sizeof(unsigned int),
 283                 .mode           = 0644,
 284                 .proc_handler   = proc_dointvec,
 285         },
 286 #ifdef CONFIG_SCHED_DEBUG
 287         {
 288                 .procname       = "sched_min_granularity_ns",
 289                 .data           = &sysctl_sched_min_granularity,
 290                 .maxlen         = sizeof(unsigned int),
 291                 .mode           = 0644,
 292                 .proc_handler   = sched_proc_update_handler,
 293                 .extra1         = &min_sched_granularity_ns,
 294                 .extra2         = &max_sched_granularity_ns,
 295         },
 296         {
 297                 .procname       = "sched_latency_ns",
 298                 .data           = &sysctl_sched_latency,
 299                 .maxlen         = sizeof(unsigned int),
 300                 .mode           = 0644,
 301                 .proc_handler   = sched_proc_update_handler,
 302                 .extra1         = &min_sched_granularity_ns,
 303                 .extra2         = &max_sched_granularity_ns,
 304         },
 305         {
 306                 .procname       = "sched_wakeup_granularity_ns",
 307                 .data           = &sysctl_sched_wakeup_granularity,
 308                 .maxlen         = sizeof(unsigned int),
 309                 .mode           = 0644,
 310                 .proc_handler   = sched_proc_update_handler,
 311                 .extra1         = &min_wakeup_granularity_ns,
 312                 .extra2         = &max_wakeup_granularity_ns,
 313         },
 314 #ifdef CONFIG_SMP
 315         {
 316                 .procname       = "sched_tunable_scaling",
 317                 .data           = &sysctl_sched_tunable_scaling,
 318                 .maxlen         = sizeof(enum sched_tunable_scaling),
 319                 .mode           = 0644,
 320                 .proc_handler   = sched_proc_update_handler,
 321                 .extra1         = &min_sched_tunable_scaling,
 322                 .extra2         = &max_sched_tunable_scaling,
 323         },
 324         {
 325                 .procname       = "sched_migration_cost_ns",
 326                 .data           = &sysctl_sched_migration_cost,
 327                 .maxlen         = sizeof(unsigned int),
 328                 .mode           = 0644,
 329                 .proc_handler   = proc_dointvec,
 330         },
 331         {
 332                 .procname       = "sched_nr_migrate",
 333                 .data           = &sysctl_sched_nr_migrate,
 334                 .maxlen         = sizeof(unsigned int),
 335                 .mode           = 0644,
 336                 .proc_handler   = proc_dointvec,
 337         },
 338         {
 339                 .procname       = "sched_time_avg_ms",
 340                 .data           = &sysctl_sched_time_avg,
 341                 .maxlen         = sizeof(unsigned int),
 342                 .mode           = 0644,
 343                 .proc_handler   = proc_dointvec,
 344         },
 345         {
 346                 .procname       = "sched_shares_window_ns",
 347                 .data           = &sysctl_sched_shares_window,
 348                 .maxlen         = sizeof(unsigned int),
 349                 .mode           = 0644,
 350                 .proc_handler   = proc_dointvec,
 351         },
 352         {
 353                 .procname       = "timer_migration",
 354                 .data           = &sysctl_timer_migration,
 355                 .maxlen         = sizeof(unsigned int),
 356                 .mode           = 0644,
 357                 .proc_handler   = proc_dointvec_minmax,
 358                 .extra1         = &zero,
 359                 .extra2         = &one,
 360         },
 361 #endif /* CONFIG_SMP */
 362 #ifdef CONFIG_NUMA_BALANCING
 363         {
 364                 .procname       = "numa_balancing_scan_delay_ms",
 365                 .data           = &sysctl_numa_balancing_scan_delay,
 366                 .maxlen         = sizeof(unsigned int),
 367                 .mode           = 0644,
 368                 .proc_handler   = proc_dointvec,
 369         },
 370         {
 371                 .procname       = "numa_balancing_scan_period_min_ms",
 372                 .data           = &sysctl_numa_balancing_scan_period_min,
 373                 .maxlen         = sizeof(unsigned int),
 374                 .mode           = 0644,
 375                 .proc_handler   = proc_dointvec,
 376         },
 377         {
 378                 .procname       = "numa_balancing_scan_period_max_ms",
 379                 .data           = &sysctl_numa_balancing_scan_period_max,
 380                 .maxlen         = sizeof(unsigned int),
 381                 .mode           = 0644,
 382                 .proc_handler   = proc_dointvec,
 383         },
 384         {
 385                 .procname       = "numa_balancing_scan_size_mb",
 386                 .data           = &sysctl_numa_balancing_scan_size,
 387                 .maxlen         = sizeof(unsigned int),
 388                 .mode           = 0644,
 389                 .proc_handler   = proc_dointvec_minmax,
 390                 .extra1         = &one,
 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         {
 626                 .procname       = "tracepoint_printk",
 627                 .data           = &tracepoint_printk,
 628                 .maxlen         = sizeof(tracepoint_printk),
 629                 .mode           = 0644,
 630                 .proc_handler   = proc_dointvec,
 631         },
 632 #endif
 633 #ifdef CONFIG_KEXEC
 634         {
 635                 .procname       = "kexec_load_disabled",
 636                 .data           = &kexec_load_disabled,
 637                 .maxlen         = sizeof(int),
 638                 .mode           = 0644,
 639                 /* only handle a transition from default "0" to "1" */
 640                 .proc_handler   = proc_dointvec_minmax,
 641                 .extra1         = &one,
 642                 .extra2         = &one,
 643         },
 644 #endif
 645 #ifdef CONFIG_MODULES
 646         {
 647                 .procname       = "modprobe",
 648                 .data           = &modprobe_path,
 649                 .maxlen         = KMOD_PATH_LEN,
 650                 .mode           = 0644,
 651                 .proc_handler   = proc_dostring,
 652         },
 653         {
 654                 .procname       = "modules_disabled",
 655                 .data           = &modules_disabled,
 656                 .maxlen         = sizeof(int),
 657                 .mode           = 0644,
 658                 /* only handle a transition from default "0" to "1" */
 659                 .proc_handler   = proc_dointvec_minmax,
 660                 .extra1         = &one,
 661                 .extra2         = &one,
 662         },
 663 #endif
 664 #ifdef CONFIG_UEVENT_HELPER
 665         {
 666                 .procname       = "hotplug",
 667                 .data           = &uevent_helper,
 668                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 669                 .mode           = 0644,
 670                 .proc_handler   = proc_dostring,
 671         },
 672 #endif
 673 #ifdef CONFIG_CHR_DEV_SG
 674         {
 675                 .procname       = "sg-big-buff",
 676                 .data           = &sg_big_buff,
 677                 .maxlen         = sizeof (int),
 678                 .mode           = 0444,
 679                 .proc_handler   = proc_dointvec,
 680         },
 681 #endif
 682 #ifdef CONFIG_BSD_PROCESS_ACCT
 683         {
 684                 .procname       = "acct",
 685                 .data           = &acct_parm,
 686                 .maxlen         = 3*sizeof(int),
 687                 .mode           = 0644,
 688                 .proc_handler   = proc_dointvec,
 689         },
 690 #endif
 691 #ifdef CONFIG_MAGIC_SYSRQ
 692         {
 693                 .procname       = "sysrq",
 694                 .data           = &__sysrq_enabled,
 695                 .maxlen         = sizeof (int),
 696                 .mode           = 0644,
 697                 .proc_handler   = sysrq_sysctl_handler,
 698         },
 699 #endif
 700 #ifdef CONFIG_PROC_SYSCTL
 701         {
 702                 .procname       = "cad_pid",
 703                 .data           = NULL,
 704                 .maxlen         = sizeof (int),
 705                 .mode           = 0600,
 706                 .proc_handler   = proc_do_cad_pid,
 707         },
 708 #endif
 709         {
 710                 .procname       = "threads-max",
 711                 .data           = NULL,
 712                 .maxlen         = sizeof(int),
 713                 .mode           = 0644,
 714                 .proc_handler   = sysctl_max_threads,
 715         },
 716         {
 717                 .procname       = "random",
 718                 .mode           = 0555,
 719                 .child          = random_table,
 720         },
 721         {
 722                 .procname       = "usermodehelper",
 723                 .mode           = 0555,
 724                 .child          = usermodehelper_table,
 725         },
 726         {
 727                 .procname       = "overflowuid",
 728                 .data           = &overflowuid,
 729                 .maxlen         = sizeof(int),
 730                 .mode           = 0644,
 731                 .proc_handler   = proc_dointvec_minmax,
 732                 .extra1         = &minolduid,
 733                 .extra2         = &maxolduid,
 734         },
 735         {
 736                 .procname       = "overflowgid",
 737                 .data           = &overflowgid,
 738                 .maxlen         = sizeof(int),
 739                 .mode           = 0644,
 740                 .proc_handler   = proc_dointvec_minmax,
 741                 .extra1         = &minolduid,
 742                 .extra2         = &maxolduid,
 743         },
 744 #ifdef CONFIG_S390
 745 #ifdef CONFIG_MATHEMU
 746         {
 747                 .procname       = "ieee_emulation_warnings",
 748                 .data           = &sysctl_ieee_emulation_warnings,
 749                 .maxlen         = sizeof(int),
 750                 .mode           = 0644,
 751                 .proc_handler   = proc_dointvec,
 752         },
 753 #endif
 754         {
 755                 .procname       = "userprocess_debug",
 756                 .data           = &show_unhandled_signals,
 757                 .maxlen         = sizeof(int),
 758                 .mode           = 0644,
 759                 .proc_handler   = proc_dointvec,
 760         },
 761 #endif
 762         {
 763                 .procname       = "pid_max",
 764                 .data           = &pid_max,
 765                 .maxlen         = sizeof (int),
 766                 .mode           = 0644,
 767                 .proc_handler   = proc_dointvec_minmax,
 768                 .extra1         = &pid_max_min,
 769                 .extra2         = &pid_max_max,
 770         },
 771         {
 772                 .procname       = "panic_on_oops",
 773                 .data           = &panic_on_oops,
 774                 .maxlen         = sizeof(int),
 775                 .mode           = 0644,
 776                 .proc_handler   = proc_dointvec,
 777         },
 778 #if defined CONFIG_PRINTK
 779         {
 780                 .procname       = "printk",
 781                 .data           = &console_loglevel,
 782                 .maxlen         = 4*sizeof(int),
 783                 .mode           = 0644,
 784                 .proc_handler   = proc_dointvec,
 785         },
 786         {
 787                 .procname       = "printk_ratelimit",
 788                 .data           = &printk_ratelimit_state.interval,
 789                 .maxlen         = sizeof(int),
 790                 .mode           = 0644,
 791                 .proc_handler   = proc_dointvec_jiffies,
 792         },
 793         {
 794                 .procname       = "printk_ratelimit_burst",
 795                 .data           = &printk_ratelimit_state.burst,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = proc_dointvec,
 799         },
 800         {
 801                 .procname       = "printk_delay",
 802                 .data           = &printk_delay_msec,
 803                 .maxlen         = sizeof(int),
 804                 .mode           = 0644,
 805                 .proc_handler   = proc_dointvec_minmax,
 806                 .extra1         = &zero,
 807                 .extra2         = &ten_thousand,
 808         },
 809         {
 810                 .procname       = "dmesg_restrict",
 811                 .data           = &dmesg_restrict,
 812                 .maxlen         = sizeof(int),
 813                 .mode           = 0644,
 814                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 815                 .extra1         = &zero,
 816                 .extra2         = &one,
 817         },
 818         {
 819                 .procname       = "kptr_restrict",
 820                 .data           = &kptr_restrict,
 821                 .maxlen         = sizeof(int),
 822                 .mode           = 0644,
 823                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 824                 .extra1         = &zero,
 825                 .extra2         = &two,
 826         },
 827 #endif
 828         {
 829                 .procname       = "ngroups_max",
 830                 .data           = &ngroups_max,
 831                 .maxlen         = sizeof (int),
 832                 .mode           = 0444,
 833                 .proc_handler   = proc_dointvec,
 834         },
 835         {
 836                 .procname       = "cap_last_cap",
 837                 .data           = (void *)&cap_last_cap,
 838                 .maxlen         = sizeof(int),
 839                 .mode           = 0444,
 840                 .proc_handler   = proc_dointvec,
 841         },
 842 #if defined(CONFIG_LOCKUP_DETECTOR)
 843         {
 844                 .procname       = "watchdog",
 845                 .data           = &watchdog_user_enabled,
 846                 .maxlen         = sizeof (int),
 847                 .mode           = 0644,
 848                 .proc_handler   = proc_watchdog,
 849                 .extra1         = &zero,
 850                 .extra2         = &one,
 851         },
 852         {
 853                 .procname       = "watchdog_thresh",
 854                 .data           = &watchdog_thresh,
 855                 .maxlen         = sizeof(int),
 856                 .mode           = 0644,
 857                 .proc_handler   = proc_watchdog_thresh,
 858                 .extra1         = &zero,
 859                 .extra2         = &sixty,
 860         },
 861         {
 862                 .procname       = "nmi_watchdog",
 863                 .data           = &nmi_watchdog_enabled,
 864                 .maxlen         = sizeof (int),
 865                 .mode           = 0644,
 866                 .proc_handler   = proc_nmi_watchdog,
 867                 .extra1         = &zero,
 868 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
 869                 .extra2         = &one,
 870 #else
 871                 .extra2         = &zero,
 872 #endif
 873         },
 874         {
 875                 .procname       = "soft_watchdog",
 876                 .data           = &soft_watchdog_enabled,
 877                 .maxlen         = sizeof (int),
 878                 .mode           = 0644,
 879                 .proc_handler   = proc_soft_watchdog,
 880                 .extra1         = &zero,
 881                 .extra2         = &one,
 882         },
 883         {
 884                 .procname       = "softlockup_panic",
 885                 .data           = &softlockup_panic,
 886                 .maxlen         = sizeof(int),
 887                 .mode           = 0644,
 888                 .proc_handler   = proc_dointvec_minmax,
 889                 .extra1         = &zero,
 890                 .extra2         = &one,
 891         },
 892 #ifdef CONFIG_SMP
 893         {
 894                 .procname       = "softlockup_all_cpu_backtrace",
 895                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 896                 .maxlen         = sizeof(int),
 897                 .mode           = 0644,
 898                 .proc_handler   = proc_dointvec_minmax,
 899                 .extra1         = &zero,
 900                 .extra2         = &one,
 901         },
 902 #endif /* CONFIG_SMP */
 903 #endif
 904 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 905         {
 906                 .procname       = "unknown_nmi_panic",
 907                 .data           = &unknown_nmi_panic,
 908                 .maxlen         = sizeof (int),
 909                 .mode           = 0644,
 910                 .proc_handler   = proc_dointvec,
 911         },
 912 #endif
 913 #if defined(CONFIG_X86)
 914         {
 915                 .procname       = "panic_on_unrecovered_nmi",
 916                 .data           = &panic_on_unrecovered_nmi,
 917                 .maxlen         = sizeof(int),
 918                 .mode           = 0644,
 919                 .proc_handler   = proc_dointvec,
 920         },
 921         {
 922                 .procname       = "panic_on_io_nmi",
 923                 .data           = &panic_on_io_nmi,
 924                 .maxlen         = sizeof(int),
 925                 .mode           = 0644,
 926                 .proc_handler   = proc_dointvec,
 927         },
 928 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 929         {
 930                 .procname       = "panic_on_stackoverflow",
 931                 .data           = &sysctl_panic_on_stackoverflow,
 932                 .maxlen         = sizeof(int),
 933                 .mode           = 0644,
 934                 .proc_handler   = proc_dointvec,
 935         },
 936 #endif
 937         {
 938                 .procname       = "bootloader_type",
 939                 .data           = &bootloader_type,
 940                 .maxlen         = sizeof (int),
 941                 .mode           = 0444,
 942                 .proc_handler   = proc_dointvec,
 943         },
 944         {
 945                 .procname       = "bootloader_version",
 946                 .data           = &bootloader_version,
 947                 .maxlen         = sizeof (int),
 948                 .mode           = 0444,
 949                 .proc_handler   = proc_dointvec,
 950         },
 951         {
 952                 .procname       = "kstack_depth_to_print",
 953                 .data           = &kstack_depth_to_print,
 954                 .maxlen         = sizeof(int),
 955                 .mode           = 0644,
 956                 .proc_handler   = proc_dointvec,
 957         },
 958         {
 959                 .procname       = "io_delay_type",
 960                 .data           = &io_delay_type,
 961                 .maxlen         = sizeof(int),
 962                 .mode           = 0644,
 963                 .proc_handler   = proc_dointvec,
 964         },
 965 #endif
 966 #if defined(CONFIG_MMU)
 967         {
 968                 .procname       = "randomize_va_space",
 969                 .data           = &randomize_va_space,
 970                 .maxlen         = sizeof(int),
 971                 .mode           = 0644,
 972                 .proc_handler   = proc_dointvec,
 973         },
 974 #endif
 975 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 976         {
 977                 .procname       = "spin_retry",
 978                 .data           = &spin_retry,
 979                 .maxlen         = sizeof (int),
 980                 .mode           = 0644,
 981                 .proc_handler   = proc_dointvec,
 982         },
 983 #endif
 984 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 985         {
 986                 .procname       = "acpi_video_flags",
 987                 .data           = &acpi_realmode_flags,
 988                 .maxlen         = sizeof (unsigned long),
 989                 .mode           = 0644,
 990                 .proc_handler   = proc_doulongvec_minmax,
 991         },
 992 #endif
 993 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 994         {
 995                 .procname       = "ignore-unaligned-usertrap",
 996                 .data           = &no_unaligned_warning,
 997                 .maxlen         = sizeof (int),
 998                 .mode           = 0644,
 999                 .proc_handler   = proc_dointvec,
1000         },
1001 #endif
1002 #ifdef CONFIG_IA64
1003         {
1004                 .procname       = "unaligned-dump-stack",
1005                 .data           = &unaligned_dump_stack,
1006                 .maxlen         = sizeof (int),
1007                 .mode           = 0644,
1008                 .proc_handler   = proc_dointvec,
1009         },
1010 #endif
1011 #ifdef CONFIG_DETECT_HUNG_TASK
1012         {
1013                 .procname       = "hung_task_panic",
1014                 .data           = &sysctl_hung_task_panic,
1015                 .maxlen         = sizeof(int),
1016                 .mode           = 0644,
1017                 .proc_handler   = proc_dointvec_minmax,
1018                 .extra1         = &zero,
1019                 .extra2         = &one,
1020         },
1021         {
1022                 .procname       = "hung_task_check_count",
1023                 .data           = &sysctl_hung_task_check_count,
1024                 .maxlen         = sizeof(int),
1025                 .mode           = 0644,
1026                 .proc_handler   = proc_dointvec_minmax,
1027                 .extra1         = &zero,
1028         },
1029         {
1030                 .procname       = "hung_task_timeout_secs",
1031                 .data           = &sysctl_hung_task_timeout_secs,
1032                 .maxlen         = sizeof(unsigned long),
1033                 .mode           = 0644,
1034                 .proc_handler   = proc_dohung_task_timeout_secs,
1035                 .extra2         = &hung_task_timeout_max,
1036         },
1037         {
1038                 .procname       = "hung_task_warnings",
1039                 .data           = &sysctl_hung_task_warnings,
1040                 .maxlen         = sizeof(int),
1041                 .mode           = 0644,
1042                 .proc_handler   = proc_dointvec_minmax,
1043                 .extra1         = &neg_one,
1044         },
1045 #endif
1046 #ifdef CONFIG_COMPAT
1047         {
1048                 .procname       = "compat-log",
1049                 .data           = &compat_log,
1050                 .maxlen         = sizeof (int),
1051                 .mode           = 0644,
1052                 .proc_handler   = proc_dointvec,
1053         },
1054 #endif
1055 #ifdef CONFIG_RT_MUTEXES
1056         {
1057                 .procname       = "max_lock_depth",
1058                 .data           = &max_lock_depth,
1059                 .maxlen         = sizeof(int),
1060                 .mode           = 0644,
1061                 .proc_handler   = proc_dointvec,
1062         },
1063 #endif
1064         {
1065                 .procname       = "poweroff_cmd",
1066                 .data           = &poweroff_cmd,
1067                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1068                 .mode           = 0644,
1069                 .proc_handler   = proc_dostring,
1070         },
1071 #ifdef CONFIG_KEYS
1072         {
1073                 .procname       = "keys",
1074                 .mode           = 0555,
1075                 .child          = key_sysctls,
1076         },
1077 #endif
1078 #ifdef CONFIG_PERF_EVENTS
1079         /*
1080          * User-space scripts rely on the existence of this file
1081          * as a feature check for perf_events being enabled.
1082          *
1083          * So it's an ABI, do not remove!
1084          */
1085         {
1086                 .procname       = "perf_event_paranoid",
1087                 .data           = &sysctl_perf_event_paranoid,
1088                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1089                 .mode           = 0644,
1090                 .proc_handler   = proc_dointvec,
1091         },
1092         {
1093                 .procname       = "perf_event_mlock_kb",
1094                 .data           = &sysctl_perf_event_mlock,
1095                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1096                 .mode           = 0644,
1097                 .proc_handler   = proc_dointvec,
1098         },
1099         {
1100                 .procname       = "perf_event_max_sample_rate",
1101                 .data           = &sysctl_perf_event_sample_rate,
1102                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1103                 .mode           = 0644,
1104                 .proc_handler   = perf_proc_update_handler,
1105                 .extra1         = &one,
1106         },
1107         {
1108                 .procname       = "perf_cpu_time_max_percent",
1109                 .data           = &sysctl_perf_cpu_time_max_percent,
1110                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1111                 .mode           = 0644,
1112                 .proc_handler   = perf_cpu_time_max_percent_handler,
1113                 .extra1         = &zero,
1114                 .extra2         = &one_hundred,
1115         },
1116 #endif
1117 #ifdef CONFIG_KMEMCHECK
1118         {
1119                 .procname       = "kmemcheck",
1120                 .data           = &kmemcheck_enabled,
1121                 .maxlen         = sizeof(int),
1122                 .mode           = 0644,
1123                 .proc_handler   = proc_dointvec,
1124         },
1125 #endif
1126         {
1127                 .procname       = "panic_on_warn",
1128                 .data           = &panic_on_warn,
1129                 .maxlen         = sizeof(int),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dointvec_minmax,
1132                 .extra1         = &zero,
1133                 .extra2         = &one,
1134         },
1135         { }
1136 };
1137
1138 static struct ctl_table vm_table[] = {
1139         {
1140                 .procname       = "overcommit_memory",
1141                 .data           = &sysctl_overcommit_memory,
1142                 .maxlen         = sizeof(sysctl_overcommit_memory),
1143                 .mode           = 0644,
1144                 .proc_handler   = proc_dointvec_minmax,
1145                 .extra1         = &zero,
1146                 .extra2         = &two,
1147         },
1148         {
1149                 .procname       = "panic_on_oom",
1150                 .data           = &sysctl_panic_on_oom,
1151                 .maxlen         = sizeof(sysctl_panic_on_oom),
1152                 .mode           = 0644,
1153                 .proc_handler   = proc_dointvec_minmax,
1154                 .extra1         = &zero,
1155                 .extra2         = &two,
1156         },
1157         {
1158                 .procname       = "oom_kill_allocating_task",
1159                 .data           = &sysctl_oom_kill_allocating_task,
1160                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1161                 .mode           = 0644,
1162                 .proc_handler   = proc_dointvec,
1163         },
1164         {
1165                 .procname       = "oom_dump_tasks",
1166                 .data           = &sysctl_oom_dump_tasks,
1167                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1168                 .mode           = 0644,
1169                 .proc_handler   = proc_dointvec,
1170         },
1171         {
1172                 .procname       = "overcommit_ratio",
1173                 .data           = &sysctl_overcommit_ratio,
1174                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1175                 .mode           = 0644,
1176                 .proc_handler   = overcommit_ratio_handler,
1177         },
1178         {
1179                 .procname       = "overcommit_kbytes",
1180                 .data           = &sysctl_overcommit_kbytes,
1181                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1182                 .mode           = 0644,
1183                 .proc_handler   = overcommit_kbytes_handler,
1184         },
1185         {
1186                 .procname       = "page-cluster",
1187                 .data           = &page_cluster,
1188                 .maxlen         = sizeof(int),
1189                 .mode           = 0644,
1190                 .proc_handler   = proc_dointvec_minmax,
1191                 .extra1         = &zero,
1192         },
1193         {
1194                 .procname       = "dirty_background_ratio",
1195                 .data           = &dirty_background_ratio,
1196                 .maxlen         = sizeof(dirty_background_ratio),
1197                 .mode           = 0644,
1198                 .proc_handler   = dirty_background_ratio_handler,
1199                 .extra1         = &zero,
1200                 .extra2         = &one_hundred,
1201         },
1202         {
1203                 .procname       = "dirty_background_bytes",
1204                 .data           = &dirty_background_bytes,
1205                 .maxlen         = sizeof(dirty_background_bytes),
1206                 .mode           = 0644,
1207                 .proc_handler   = dirty_background_bytes_handler,
1208                 .extra1         = &one_ul,
1209         },
1210         {
1211                 .procname       = "dirty_ratio",
1212                 .data           = &vm_dirty_ratio,
1213                 .maxlen         = sizeof(vm_dirty_ratio),
1214                 .mode           = 0644,
1215                 .proc_handler   = dirty_ratio_handler,
1216                 .extra1         = &zero,
1217                 .extra2         = &one_hundred,
1218         },
1219         {
1220                 .procname       = "dirty_bytes",
1221                 .data           = &vm_dirty_bytes,
1222                 .maxlen         = sizeof(vm_dirty_bytes),
1223                 .mode           = 0644,
1224                 .proc_handler   = dirty_bytes_handler,
1225                 .extra1         = &dirty_bytes_min,
1226         },
1227         {
1228                 .procname       = "dirty_writeback_centisecs",
1229                 .data           = &dirty_writeback_interval,
1230                 .maxlen         = sizeof(dirty_writeback_interval),
1231                 .mode           = 0644,
1232                 .proc_handler   = dirty_writeback_centisecs_handler,
1233         },
1234         {
1235                 .procname       = "dirty_expire_centisecs",
1236                 .data           = &dirty_expire_interval,
1237                 .maxlen         = sizeof(dirty_expire_interval),
1238                 .mode           = 0644,
1239                 .proc_handler   = proc_dointvec_minmax,
1240                 .extra1         = &zero,
1241         },
1242         {
1243                 .procname       = "dirtytime_expire_seconds",
1244                 .data           = &dirtytime_expire_interval,
1245                 .maxlen         = sizeof(dirty_expire_interval),
1246                 .mode           = 0644,
1247                 .proc_handler   = dirtytime_interval_handler,
1248                 .extra1         = &zero,
1249         },
1250         {
1251                 .procname       = "nr_pdflush_threads",
1252                 .mode           = 0444 /* read-only */,
1253                 .proc_handler   = pdflush_proc_obsolete,
1254         },
1255         {
1256                 .procname       = "swappiness",
1257                 .data           = &vm_swappiness,
1258                 .maxlen         = sizeof(vm_swappiness),
1259                 .mode           = 0644,
1260                 .proc_handler   = proc_dointvec_minmax,
1261                 .extra1         = &zero,
1262                 .extra2         = &one_hundred,
1263         },
1264 #ifdef CONFIG_HUGETLB_PAGE
1265         {
1266                 .procname       = "nr_hugepages",
1267                 .data           = NULL,
1268                 .maxlen         = sizeof(unsigned long),
1269                 .mode           = 0644,
1270                 .proc_handler   = hugetlb_sysctl_handler,
1271         },
1272 #ifdef CONFIG_NUMA
1273         {
1274                 .procname       = "nr_hugepages_mempolicy",
1275                 .data           = NULL,
1276                 .maxlen         = sizeof(unsigned long),
1277                 .mode           = 0644,
1278                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1279         },
1280 #endif
1281          {
1282                 .procname       = "hugetlb_shm_group",
1283                 .data           = &sysctl_hugetlb_shm_group,
1284                 .maxlen         = sizeof(gid_t),
1285                 .mode           = 0644,
1286                 .proc_handler   = proc_dointvec,
1287          },
1288          {
1289                 .procname       = "hugepages_treat_as_movable",
1290                 .data           = &hugepages_treat_as_movable,
1291                 .maxlen         = sizeof(int),
1292                 .mode           = 0644,
1293                 .proc_handler   = proc_dointvec,
1294         },
1295         {
1296                 .procname       = "nr_overcommit_hugepages",
1297                 .data           = NULL,
1298                 .maxlen         = sizeof(unsigned long),
1299                 .mode           = 0644,
1300                 .proc_handler   = hugetlb_overcommit_handler,
1301         },
1302 #endif
1303         {
1304                 .procname       = "lowmem_reserve_ratio",
1305                 .data           = &sysctl_lowmem_reserve_ratio,
1306                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1307                 .mode           = 0644,
1308                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1309         },
1310         {
1311                 .procname       = "drop_caches",
1312                 .data           = &sysctl_drop_caches,
1313                 .maxlen         = sizeof(int),
1314                 .mode           = 0644,
1315                 .proc_handler   = drop_caches_sysctl_handler,
1316                 .extra1         = &one,
1317                 .extra2         = &four,
1318         },
1319 #ifdef CONFIG_COMPACTION
1320         {
1321                 .procname       = "compact_memory",
1322                 .data           = &sysctl_compact_memory,
1323                 .maxlen         = sizeof(int),
1324                 .mode           = 0200,
1325                 .proc_handler   = sysctl_compaction_handler,
1326         },
1327         {
1328                 .procname       = "extfrag_threshold",
1329                 .data           = &sysctl_extfrag_threshold,
1330                 .maxlen         = sizeof(int),
1331                 .mode           = 0644,
1332                 .proc_handler   = sysctl_extfrag_handler,
1333                 .extra1         = &min_extfrag_threshold,
1334                 .extra2         = &max_extfrag_threshold,
1335         },
1336         {
1337                 .procname       = "compact_unevictable_allowed",
1338                 .data           = &sysctl_compact_unevictable_allowed,
1339                 .maxlen         = sizeof(int),
1340                 .mode           = 0644,
1341                 .proc_handler   = proc_dointvec,
1342                 .extra1         = &zero,
1343                 .extra2         = &one,
1344         },
1345
1346 #endif /* CONFIG_COMPACTION */
1347         {
1348                 .procname       = "min_free_kbytes",
1349                 .data           = &min_free_kbytes,
1350                 .maxlen         = sizeof(min_free_kbytes),
1351                 .mode           = 0644,
1352                 .proc_handler   = min_free_kbytes_sysctl_handler,
1353                 .extra1         = &zero,
1354         },
1355         {
1356                 .procname       = "percpu_pagelist_fraction",
1357                 .data           = &percpu_pagelist_fraction,
1358                 .maxlen         = sizeof(percpu_pagelist_fraction),
1359                 .mode           = 0644,
1360                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1361                 .extra1         = &zero,
1362         },
1363 #ifdef CONFIG_MMU
1364         {
1365                 .procname       = "max_map_count",
1366                 .data           = &sysctl_max_map_count,
1367                 .maxlen         = sizeof(sysctl_max_map_count),
1368                 .mode           = 0644,
1369                 .proc_handler   = proc_dointvec_minmax,
1370                 .extra1         = &zero,
1371         },
1372 #else
1373         {
1374                 .procname       = "nr_trim_pages",
1375                 .data           = &sysctl_nr_trim_pages,
1376                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1377                 .mode           = 0644,
1378                 .proc_handler   = proc_dointvec_minmax,
1379                 .extra1         = &zero,
1380         },
1381 #endif
1382         {
1383                 .procname       = "laptop_mode",
1384                 .data           = &laptop_mode,
1385                 .maxlen         = sizeof(laptop_mode),
1386                 .mode           = 0644,
1387                 .proc_handler   = proc_dointvec_jiffies,
1388         },
1389         {
1390                 .procname       = "block_dump",
1391                 .data           = &block_dump,
1392                 .maxlen         = sizeof(block_dump),
1393                 .mode           = 0644,
1394                 .proc_handler   = proc_dointvec,
1395                 .extra1         = &zero,
1396         },
1397         {
1398                 .procname       = "vfs_cache_pressure",
1399                 .data           = &sysctl_vfs_cache_pressure,
1400                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1401                 .mode           = 0644,
1402                 .proc_handler   = proc_dointvec,
1403                 .extra1         = &zero,
1404         },
1405 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1406         {
1407                 .procname       = "legacy_va_layout",
1408                 .data           = &sysctl_legacy_va_layout,
1409                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1410                 .mode           = 0644,
1411                 .proc_handler   = proc_dointvec,
1412                 .extra1         = &zero,
1413         },
1414 #endif
1415 #ifdef CONFIG_NUMA
1416         {
1417                 .procname       = "zone_reclaim_mode",
1418                 .data           = &zone_reclaim_mode,
1419                 .maxlen         = sizeof(zone_reclaim_mode),
1420                 .mode           = 0644,
1421                 .proc_handler   = proc_dointvec,
1422                 .extra1         = &zero,
1423         },
1424         {
1425                 .procname       = "min_unmapped_ratio",
1426                 .data           = &sysctl_min_unmapped_ratio,
1427                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1428                 .mode           = 0644,
1429                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1430                 .extra1         = &zero,
1431                 .extra2         = &one_hundred,
1432         },
1433         {
1434                 .procname       = "min_slab_ratio",
1435                 .data           = &sysctl_min_slab_ratio,
1436                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1437                 .mode           = 0644,
1438                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1439                 .extra1         = &zero,
1440                 .extra2         = &one_hundred,
1441         },
1442 #endif
1443 #ifdef CONFIG_SMP
1444         {
1445                 .procname       = "stat_interval",
1446                 .data           = &sysctl_stat_interval,
1447                 .maxlen         = sizeof(sysctl_stat_interval),
1448                 .mode           = 0644,
1449                 .proc_handler   = proc_dointvec_jiffies,
1450         },
1451 #endif
1452 #ifdef CONFIG_MMU
1453         {
1454                 .procname       = "mmap_min_addr",
1455                 .data           = &dac_mmap_min_addr,
1456                 .maxlen         = sizeof(unsigned long),
1457                 .mode           = 0644,
1458                 .proc_handler   = mmap_min_addr_handler,
1459         },
1460 #endif
1461 #ifdef CONFIG_NUMA
1462         {
1463                 .procname       = "numa_zonelist_order",
1464                 .data           = &numa_zonelist_order,
1465                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1466                 .mode           = 0644,
1467                 .proc_handler   = numa_zonelist_order_handler,
1468         },
1469 #endif
1470 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1471    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1472         {
1473                 .procname       = "vdso_enabled",
1474 #ifdef CONFIG_X86_32
1475                 .data           = &vdso32_enabled,
1476                 .maxlen         = sizeof(vdso32_enabled),
1477 #else
1478                 .data           = &vdso_enabled,
1479                 .maxlen         = sizeof(vdso_enabled),
1480 #endif
1481                 .mode           = 0644,
1482                 .proc_handler   = proc_dointvec,
1483                 .extra1         = &zero,
1484         },
1485 #endif
1486 #ifdef CONFIG_HIGHMEM
1487         {
1488                 .procname       = "highmem_is_dirtyable",
1489                 .data           = &vm_highmem_is_dirtyable,
1490                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1491                 .mode           = 0644,
1492                 .proc_handler   = proc_dointvec_minmax,
1493                 .extra1         = &zero,
1494                 .extra2         = &one,
1495         },
1496 #endif
1497 #ifdef CONFIG_MEMORY_FAILURE
1498         {
1499                 .procname       = "memory_failure_early_kill",
1500                 .data           = &sysctl_memory_failure_early_kill,
1501                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1502                 .mode           = 0644,
1503                 .proc_handler   = proc_dointvec_minmax,
1504                 .extra1         = &zero,
1505                 .extra2         = &one,
1506         },
1507         {
1508                 .procname       = "memory_failure_recovery",
1509                 .data           = &sysctl_memory_failure_recovery,
1510                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1511                 .mode           = 0644,
1512                 .proc_handler   = proc_dointvec_minmax,
1513                 .extra1         = &zero,
1514                 .extra2         = &one,
1515         },
1516 #endif
1517         {
1518                 .procname       = "user_reserve_kbytes",
1519                 .data           = &sysctl_user_reserve_kbytes,
1520                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1521                 .mode           = 0644,
1522                 .proc_handler   = proc_doulongvec_minmax,
1523         },
1524         {
1525                 .procname       = "admin_reserve_kbytes",
1526                 .data           = &sysctl_admin_reserve_kbytes,
1527                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1528                 .mode           = 0644,
1529                 .proc_handler   = proc_doulongvec_minmax,
1530         },
1531         { }
1532 };
1533
1534 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1535 static struct ctl_table binfmt_misc_table[] = {
1536         { }
1537 };
1538 #endif
1539
1540 static struct ctl_table fs_table[] = {
1541         {
1542                 .procname       = "inode-nr",
1543                 .data           = &inodes_stat,
1544                 .maxlen         = 2*sizeof(long),
1545                 .mode           = 0444,
1546                 .proc_handler   = proc_nr_inodes,
1547         },
1548         {
1549                 .procname       = "inode-state",
1550                 .data           = &inodes_stat,
1551                 .maxlen         = 7*sizeof(long),
1552                 .mode           = 0444,
1553                 .proc_handler   = proc_nr_inodes,
1554         },
1555         {
1556                 .procname       = "file-nr",
1557                 .data           = &files_stat,
1558                 .maxlen         = sizeof(files_stat),
1559                 .mode           = 0444,
1560                 .proc_handler   = proc_nr_files,
1561         },
1562         {
1563                 .procname       = "file-max",
1564                 .data           = &files_stat.max_files,
1565                 .maxlen         = sizeof(files_stat.max_files),
1566                 .mode           = 0644,
1567                 .proc_handler   = proc_doulongvec_minmax,
1568         },
1569         {
1570                 .procname       = "nr_open",
1571                 .data           = &sysctl_nr_open,
1572                 .maxlen         = sizeof(int),
1573                 .mode           = 0644,
1574                 .proc_handler   = proc_dointvec_minmax,
1575                 .extra1         = &sysctl_nr_open_min,
1576                 .extra2         = &sysctl_nr_open_max,
1577         },
1578         {
1579                 .procname       = "dentry-state",
1580                 .data           = &dentry_stat,
1581                 .maxlen         = 6*sizeof(long),
1582                 .mode           = 0444,
1583                 .proc_handler   = proc_nr_dentry,
1584         },
1585         {
1586                 .procname       = "overflowuid",
1587                 .data           = &fs_overflowuid,
1588                 .maxlen         = sizeof(int),
1589                 .mode           = 0644,
1590                 .proc_handler   = proc_dointvec_minmax,
1591                 .extra1         = &minolduid,
1592                 .extra2         = &maxolduid,
1593         },
1594         {
1595                 .procname       = "overflowgid",
1596                 .data           = &fs_overflowgid,
1597                 .maxlen         = sizeof(int),
1598                 .mode           = 0644,
1599                 .proc_handler   = proc_dointvec_minmax,
1600                 .extra1         = &minolduid,
1601                 .extra2         = &maxolduid,
1602         },
1603 #ifdef CONFIG_FILE_LOCKING
1604         {
1605                 .procname       = "leases-enable",
1606                 .data           = &leases_enable,
1607                 .maxlen         = sizeof(int),
1608                 .mode           = 0644,
1609                 .proc_handler   = proc_dointvec,
1610         },
1611 #endif
1612 #ifdef CONFIG_DNOTIFY
1613         {
1614                 .procname       = "dir-notify-enable",
1615                 .data           = &dir_notify_enable,
1616                 .maxlen         = sizeof(int),
1617                 .mode           = 0644,
1618                 .proc_handler   = proc_dointvec,
1619         },
1620 #endif
1621 #ifdef CONFIG_MMU
1622 #ifdef CONFIG_FILE_LOCKING
1623         {
1624                 .procname       = "lease-break-time",
1625                 .data           = &lease_break_time,
1626                 .maxlen         = sizeof(int),
1627                 .mode           = 0644,
1628                 .proc_handler   = proc_dointvec,
1629         },
1630 #endif
1631 #ifdef CONFIG_AIO
1632         {
1633                 .procname       = "aio-nr",
1634                 .data           = &aio_nr,
1635                 .maxlen         = sizeof(aio_nr),
1636                 .mode           = 0444,
1637                 .proc_handler   = proc_doulongvec_minmax,
1638         },
1639         {
1640                 .procname       = "aio-max-nr",
1641                 .data           = &aio_max_nr,
1642                 .maxlen         = sizeof(aio_max_nr),
1643                 .mode           = 0644,
1644                 .proc_handler   = proc_doulongvec_minmax,
1645         },
1646 #endif /* CONFIG_AIO */
1647 #ifdef CONFIG_INOTIFY_USER
1648         {
1649                 .procname       = "inotify",
1650                 .mode           = 0555,
1651                 .child          = inotify_table,
1652         },
1653 #endif
1654 #ifdef CONFIG_EPOLL
1655         {
1656                 .procname       = "epoll",
1657                 .mode           = 0555,
1658                 .child          = epoll_table,
1659         },
1660 #endif
1661 #endif
1662         {
1663                 .procname       = "protected_symlinks",
1664                 .data           = &sysctl_protected_symlinks,
1665                 .maxlen         = sizeof(int),
1666                 .mode           = 0600,
1667                 .proc_handler   = proc_dointvec_minmax,
1668                 .extra1         = &zero,
1669                 .extra2         = &one,
1670         },
1671         {
1672                 .procname       = "protected_hardlinks",
1673                 .data           = &sysctl_protected_hardlinks,
1674                 .maxlen         = sizeof(int),
1675                 .mode           = 0600,
1676                 .proc_handler   = proc_dointvec_minmax,
1677                 .extra1         = &zero,
1678                 .extra2         = &one,
1679         },
1680         {
1681                 .procname       = "suid_dumpable",
1682                 .data           = &suid_dumpable,
1683                 .maxlen         = sizeof(int),
1684                 .mode           = 0644,
1685                 .proc_handler   = proc_dointvec_minmax_coredump,
1686                 .extra1         = &zero,
1687                 .extra2         = &two,
1688         },
1689 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1690         {
1691                 .procname       = "binfmt_misc",
1692                 .mode           = 0555,
1693                 .child          = binfmt_misc_table,
1694         },
1695 #endif
1696         {
1697                 .procname       = "pipe-max-size",
1698                 .data           = &pipe_max_size,
1699                 .maxlen         = sizeof(int),
1700                 .mode           = 0644,
1701                 .proc_handler   = &pipe_proc_fn,
1702                 .extra1         = &pipe_min_size,
1703         },
1704         { }
1705 };
1706
1707 static struct ctl_table debug_table[] = {
1708 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1709         {
1710                 .procname       = "exception-trace",
1711                 .data           = &show_unhandled_signals,
1712                 .maxlen         = sizeof(int),
1713                 .mode           = 0644,
1714                 .proc_handler   = proc_dointvec
1715         },
1716 #endif
1717 #if defined(CONFIG_OPTPROBES)
1718         {
1719                 .procname       = "kprobes-optimization",
1720                 .data           = &sysctl_kprobes_optimization,
1721                 .maxlen         = sizeof(int),
1722                 .mode           = 0644,
1723                 .proc_handler   = proc_kprobes_optimization_handler,
1724                 .extra1         = &zero,
1725                 .extra2         = &one,
1726         },
1727 #endif
1728         { }
1729 };
1730
1731 static struct ctl_table dev_table[] = {
1732         { }
1733 };
1734
1735 int __init sysctl_init(void)
1736 {
1737         struct ctl_table_header *hdr;
1738
1739         hdr = register_sysctl_table(sysctl_base_table);
1740         kmemleak_not_leak(hdr);
1741         return 0;
1742 }
1743
1744 #endif /* CONFIG_SYSCTL */
1745
1746 /*
1747  * /proc/sys support
1748  */
1749
1750 #ifdef CONFIG_PROC_SYSCTL
1751
1752 static int _proc_do_string(char *data, int maxlen, int write,
1753                            char __user *buffer,
1754                            size_t *lenp, loff_t *ppos)
1755 {
1756         size_t len;
1757         char __user *p;
1758         char c;
1759
1760         if (!data || !maxlen || !*lenp) {
1761                 *lenp = 0;
1762                 return 0;
1763         }
1764
1765         if (write) {
1766                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1767                         /* Only continue writes not past the end of buffer. */
1768                         len = strlen(data);
1769                         if (len > maxlen - 1)
1770                                 len = maxlen - 1;
1771
1772                         if (*ppos > len)
1773                                 return 0;
1774                         len = *ppos;
1775                 } else {
1776                         /* Start writing from beginning of buffer. */
1777                         len = 0;
1778                 }
1779
1780                 *ppos += *lenp;
1781                 p = buffer;
1782                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1783                         if (get_user(c, p++))
1784                                 return -EFAULT;
1785                         if (c == 0 || c == '\n')
1786                                 break;
1787                         data[len++] = c;
1788                 }
1789                 data[len] = 0;
1790         } else {
1791                 len = strlen(data);
1792                 if (len > maxlen)
1793                         len = maxlen;
1794
1795                 if (*ppos > len) {
1796                         *lenp = 0;
1797                         return 0;
1798                 }
1799
1800                 data += *ppos;
1801                 len  -= *ppos;
1802
1803                 if (len > *lenp)
1804                         len = *lenp;
1805                 if (len)
1806                         if (copy_to_user(buffer, data, len))
1807                                 return -EFAULT;
1808                 if (len < *lenp) {
1809                         if (put_user('\n', buffer + len))
1810                                 return -EFAULT;
1811                         len++;
1812                 }
1813                 *lenp = len;
1814                 *ppos += len;
1815         }
1816         return 0;
1817 }
1818
1819 static void warn_sysctl_write(struct ctl_table *table)
1820 {
1821         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1822                 "This will not be supported in the future. To silence this\n"
1823                 "warning, set kernel.sysctl_writes_strict = -1\n",
1824                 current->comm, table->procname);
1825 }
1826
1827 /**
1828  * proc_dostring - read a string sysctl
1829  * @table: the sysctl table
1830  * @write: %TRUE if this is a write to the sysctl file
1831  * @buffer: the user buffer
1832  * @lenp: the size of the user buffer
1833  * @ppos: file position
1834  *
1835  * Reads/writes a string from/to the user buffer. If the kernel
1836  * buffer provided is not large enough to hold the string, the
1837  * string is truncated. The copied string is %NULL-terminated.
1838  * If the string is being read by the user process, it is copied
1839  * and a newline '\n' is added. It is truncated if the buffer is
1840  * not large enough.
1841  *
1842  * Returns 0 on success.
1843  */
1844 int proc_dostring(struct ctl_table *table, int write,
1845                   void __user *buffer, size_t *lenp, loff_t *ppos)
1846 {
1847         if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1848                 warn_sysctl_write(table);
1849
1850         return _proc_do_string((char *)(table->data), table->maxlen, write,
1851                                (char __user *)buffer, lenp, ppos);
1852 }
1853
1854 static size_t proc_skip_spaces(char **buf)
1855 {
1856         size_t ret;
1857         char *tmp = skip_spaces(*buf);
1858         ret = tmp - *buf;
1859         *buf = tmp;
1860         return ret;
1861 }
1862
1863 static void proc_skip_char(char **buf, size_t *size, const char v)
1864 {
1865         while (*size) {
1866                 if (**buf != v)
1867                         break;
1868                 (*size)--;
1869                 (*buf)++;
1870         }
1871 }
1872
1873 #define TMPBUFLEN 22
1874 /**
1875  * proc_get_long - reads an ASCII formatted integer from a user buffer
1876  *
1877  * @buf: a kernel buffer
1878  * @size: size of the kernel buffer
1879  * @val: this is where the number will be stored
1880  * @neg: set to %TRUE if number is negative
1881  * @perm_tr: a vector which contains the allowed trailers
1882  * @perm_tr_len: size of the perm_tr vector
1883  * @tr: pointer to store the trailer character
1884  *
1885  * In case of success %0 is returned and @buf and @size are updated with
1886  * the amount of bytes read. If @tr is non-NULL and a trailing
1887  * character exists (size is non-zero after returning from this
1888  * function), @tr is updated with the trailing character.
1889  */
1890 static int proc_get_long(char **buf, size_t *size,
1891                           unsigned long *val, bool *neg,
1892                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1893 {
1894         int len;
1895         char *p, tmp[TMPBUFLEN];
1896
1897         if (!*size)
1898                 return -EINVAL;
1899
1900         len = *size;
1901         if (len > TMPBUFLEN - 1)
1902                 len = TMPBUFLEN - 1;
1903
1904         memcpy(tmp, *buf, len);
1905
1906         tmp[len] = 0;
1907         p = tmp;
1908         if (*p == '-' && *size > 1) {
1909                 *neg = true;
1910                 p++;
1911         } else
1912                 *neg = false;
1913         if (!isdigit(*p))
1914                 return -EINVAL;
1915
1916         *val = simple_strtoul(p, &p, 0);
1917
1918         len = p - tmp;
1919
1920         /* We don't know if the next char is whitespace thus we may accept
1921          * invalid integers (e.g. 1234...a) or two integers instead of one
1922          * (e.g. 123...1). So lets not allow such large numbers. */
1923         if (len == TMPBUFLEN - 1)
1924                 return -EINVAL;
1925
1926         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1927                 return -EINVAL;
1928
1929         if (tr && (len < *size))
1930                 *tr = *p;
1931
1932         *buf += len;
1933         *size -= len;
1934
1935         return 0;
1936 }
1937
1938 /**
1939  * proc_put_long - converts an integer to a decimal ASCII formatted string
1940  *
1941  * @buf: the user buffer
1942  * @size: the size of the user buffer
1943  * @val: the integer to be converted
1944  * @neg: sign of the number, %TRUE for negative
1945  *
1946  * In case of success %0 is returned and @buf and @size are updated with
1947  * the amount of bytes written.
1948  */
1949 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1950                           bool neg)
1951 {
1952         int len;
1953         char tmp[TMPBUFLEN], *p = tmp;
1954
1955         sprintf(p, "%s%lu", neg ? "-" : "", val);
1956         len = strlen(tmp);
1957         if (len > *size)
1958                 len = *size;
1959         if (copy_to_user(*buf, tmp, len))
1960                 return -EFAULT;
1961         *size -= len;
1962         *buf += len;
1963         return 0;
1964 }
1965 #undef TMPBUFLEN
1966
1967 static int proc_put_char(void __user **buf, size_t *size, char c)
1968 {
1969         if (*size) {
1970                 char __user **buffer = (char __user **)buf;
1971                 if (put_user(c, *buffer))
1972                         return -EFAULT;
1973                 (*size)--, (*buffer)++;
1974                 *buf = *buffer;
1975         }
1976         return 0;
1977 }
1978
1979 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1980                                  int *valp,
1981                                  int write, void *data)
1982 {
1983         if (write) {
1984                 if (*negp) {
1985                         if (*lvalp > (unsigned long) INT_MAX + 1)
1986                                 return -EINVAL;
1987                         *valp = -*lvalp;
1988                 } else {
1989                         if (*lvalp > (unsigned long) INT_MAX)
1990                                 return -EINVAL;
1991                         *valp = *lvalp;
1992                 }
1993         } else {
1994                 int val = *valp;
1995                 if (val < 0) {
1996                         *negp = true;
1997                         *lvalp = (unsigned long)-val;
1998                 } else {
1999                         *negp = false;
2000                         *lvalp = (unsigned long)val;
2001                 }
2002         }
2003         return 0;
2004 }
2005
2006 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2007
2008 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2009                   int write, void __user *buffer,
2010                   size_t *lenp, loff_t *ppos,
2011                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2012                               int write, void *data),
2013                   void *data)
2014 {
2015         int *i, vleft, first = 1, err = 0;
2016         unsigned long page = 0;
2017         size_t left;
2018         char *kbuf;
2019
2020         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2021                 *lenp = 0;
2022                 return 0;
2023         }
2024
2025         i = (int *) tbl_data;
2026         vleft = table->maxlen / sizeof(*i);
2027         left = *lenp;
2028
2029         if (!conv)
2030                 conv = do_proc_dointvec_conv;
2031
2032         if (write) {
2033                 if (*ppos) {
2034                         switch (sysctl_writes_strict) {
2035                         case SYSCTL_WRITES_STRICT:
2036                                 goto out;
2037                         case SYSCTL_WRITES_WARN:
2038                                 warn_sysctl_write(table);
2039                                 break;
2040                         default:
2041                                 break;
2042                         }
2043                 }
2044
2045                 if (left > PAGE_SIZE - 1)
2046                         left = PAGE_SIZE - 1;
2047                 page = __get_free_page(GFP_TEMPORARY);
2048                 kbuf = (char *) page;
2049                 if (!kbuf)
2050                         return -ENOMEM;
2051                 if (copy_from_user(kbuf, buffer, left)) {
2052                         err = -EFAULT;
2053                         goto free;
2054                 }
2055                 kbuf[left] = 0;
2056         }
2057
2058         for (; left && vleft--; i++, first=0) {
2059                 unsigned long lval;
2060                 bool neg;
2061
2062                 if (write) {
2063                         left -= proc_skip_spaces(&kbuf);
2064
2065                         if (!left)
2066                                 break;
2067                         err = proc_get_long(&kbuf, &left, &lval, &neg,
2068                                              proc_wspace_sep,
2069                                              sizeof(proc_wspace_sep), NULL);
2070                         if (err)
2071                                 break;
2072                         if (conv(&neg, &lval, i, 1, data)) {
2073                                 err = -EINVAL;
2074                                 break;
2075                         }
2076                 } else {
2077                         if (conv(&neg, &lval, i, 0, data)) {
2078                                 err = -EINVAL;
2079                                 break;
2080                         }
2081                         if (!first)
2082                                 err = proc_put_char(&buffer, &left, '\t');
2083                         if (err)
2084                                 break;
2085                         err = proc_put_long(&buffer, &left, lval, neg);
2086                         if (err)
2087                                 break;
2088                 }
2089         }
2090
2091         if (!write && !first && left && !err)
2092                 err = proc_put_char(&buffer, &left, '\n');
2093         if (write && !err && left)
2094                 left -= proc_skip_spaces(&kbuf);
2095 free:
2096         if (write) {
2097                 free_page(page);
2098                 if (first)
2099                         return err ? : -EINVAL;
2100         }
2101         *lenp -= left;
2102 out:
2103         *ppos += *lenp;
2104         return err;
2105 }
2106
2107 static int do_proc_dointvec(struct ctl_table *table, int write,
2108                   void __user *buffer, size_t *lenp, loff_t *ppos,
2109                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2110                               int write, void *data),
2111                   void *data)
2112 {
2113         return __do_proc_dointvec(table->data, table, write,
2114                         buffer, lenp, ppos, conv, data);
2115 }
2116
2117 /**
2118  * proc_dointvec - read a vector of integers
2119  * @table: the sysctl table
2120  * @write: %TRUE if this is a write to the sysctl file
2121  * @buffer: the user buffer
2122  * @lenp: the size of the user buffer
2123  * @ppos: file position
2124  *
2125  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2126  * values from/to the user buffer, treated as an ASCII string.
2127  *
2128  * Returns 0 on success.
2129  */
2130 int proc_dointvec(struct ctl_table *table, int write,
2131                      void __user *buffer, size_t *lenp, loff_t *ppos)
2132 {
2133     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2134                             NULL,NULL);
2135 }
2136
2137 /*
2138  * Taint values can only be increased
2139  * This means we can safely use a temporary.
2140  */
2141 static int proc_taint(struct ctl_table *table, int write,
2142                                void __user *buffer, size_t *lenp, loff_t *ppos)
2143 {
2144         struct ctl_table t;
2145         unsigned long tmptaint = get_taint();
2146         int err;
2147
2148         if (write && !capable(CAP_SYS_ADMIN))
2149                 return -EPERM;
2150
2151         t = *table;
2152         t.data = &tmptaint;
2153         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2154         if (err < 0)
2155                 return err;
2156
2157         if (write) {
2158                 /*
2159                  * Poor man's atomic or. Not worth adding a primitive
2160                  * to everyone's atomic.h for this
2161                  */
2162                 int i;
2163                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2164                         if ((tmptaint >> i) & 1)
2165                                 add_taint(i, LOCKDEP_STILL_OK);
2166                 }
2167         }
2168
2169         return err;
2170 }
2171
2172 #ifdef CONFIG_PRINTK
2173 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2174                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2175 {
2176         if (write && !capable(CAP_SYS_ADMIN))
2177                 return -EPERM;
2178
2179         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2180 }
2181 #endif
2182
2183 struct do_proc_dointvec_minmax_conv_param {
2184         int *min;
2185         int *max;
2186 };
2187
2188 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2189                                         int *valp,
2190                                         int write, void *data)
2191 {
2192         struct do_proc_dointvec_minmax_conv_param *param = data;
2193         if (write) {
2194                 int val = *negp ? -*lvalp : *lvalp;
2195                 if ((param->min && *param->min > val) ||
2196                     (param->max && *param->max < val))
2197                         return -EINVAL;
2198                 *valp = val;
2199         } else {
2200                 int val = *valp;
2201                 if (val < 0) {
2202                         *negp = true;
2203                         *lvalp = (unsigned long)-val;
2204                 } else {
2205                         *negp = false;
2206                         *lvalp = (unsigned long)val;
2207                 }
2208         }
2209         return 0;
2210 }
2211
2212 /**
2213  * proc_dointvec_minmax - read a vector of integers with min/max values
2214  * @table: the sysctl table
2215  * @write: %TRUE if this is a write to the sysctl file
2216  * @buffer: the user buffer
2217  * @lenp: the size of the user buffer
2218  * @ppos: file position
2219  *
2220  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2221  * values from/to the user buffer, treated as an ASCII string.
2222  *
2223  * This routine will ensure the values are within the range specified by
2224  * table->extra1 (min) and table->extra2 (max).
2225  *
2226  * Returns 0 on success.
2227  */
2228 int proc_dointvec_minmax(struct ctl_table *table, int write,
2229                   void __user *buffer, size_t *lenp, loff_t *ppos)
2230 {
2231         struct do_proc_dointvec_minmax_conv_param param = {
2232                 .min = (int *) table->extra1,
2233                 .max = (int *) table->extra2,
2234         };
2235         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2236                                 do_proc_dointvec_minmax_conv, &param);
2237 }
2238
2239 static void validate_coredump_safety(void)
2240 {
2241 #ifdef CONFIG_COREDUMP
2242         if (suid_dumpable == SUID_DUMP_ROOT &&
2243             core_pattern[0] != '/' && core_pattern[0] != '|') {
2244                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2245                         "suid_dumpable=2. Pipe handler or fully qualified "\
2246                         "core dump path required.\n");
2247         }
2248 #endif
2249 }
2250
2251 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2252                 void __user *buffer, size_t *lenp, loff_t *ppos)
2253 {
2254         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2255         if (!error)
2256                 validate_coredump_safety();
2257         return error;
2258 }
2259
2260 #ifdef CONFIG_COREDUMP
2261 static int proc_dostring_coredump(struct ctl_table *table, int write,
2262                   void __user *buffer, size_t *lenp, loff_t *ppos)
2263 {
2264         int error = proc_dostring(table, write, buffer, lenp, ppos);
2265         if (!error)
2266                 validate_coredump_safety();
2267         return error;
2268 }
2269 #endif
2270
2271 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2272                                      void __user *buffer,
2273                                      size_t *lenp, loff_t *ppos,
2274                                      unsigned long convmul,
2275                                      unsigned long convdiv)
2276 {
2277         unsigned long *i, *min, *max;
2278         int vleft, first = 1, err = 0;
2279         unsigned long page = 0;
2280         size_t left;
2281         char *kbuf;
2282
2283         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2284                 *lenp = 0;
2285                 return 0;
2286         }
2287
2288         i = (unsigned long *) data;
2289         min = (unsigned long *) table->extra1;
2290         max = (unsigned long *) table->extra2;
2291         vleft = table->maxlen / sizeof(unsigned long);
2292         left = *lenp;
2293
2294         if (write) {
2295                 if (*ppos) {
2296                         switch (sysctl_writes_strict) {
2297                         case SYSCTL_WRITES_STRICT:
2298                                 goto out;
2299                         case SYSCTL_WRITES_WARN:
2300                                 warn_sysctl_write(table);
2301                                 break;
2302                         default:
2303                                 break;
2304                         }
2305                 }
2306
2307                 if (left > PAGE_SIZE - 1)
2308                         left = PAGE_SIZE - 1;
2309                 page = __get_free_page(GFP_TEMPORARY);
2310                 kbuf = (char *) page;
2311                 if (!kbuf)
2312                         return -ENOMEM;
2313                 if (copy_from_user(kbuf, buffer, left)) {
2314                         err = -EFAULT;
2315                         goto free;
2316                 }
2317                 kbuf[left] = 0;
2318         }
2319
2320         for (; left && vleft--; i++, first = 0) {
2321                 unsigned long val;
2322
2323                 if (write) {
2324                         bool neg;
2325
2326                         left -= proc_skip_spaces(&kbuf);
2327
2328                         err = proc_get_long(&kbuf, &left, &val, &neg,
2329                                              proc_wspace_sep,
2330                                              sizeof(proc_wspace_sep), NULL);
2331                         if (err)
2332                                 break;
2333                         if (neg)
2334                                 continue;
2335                         if ((min && val < *min) || (max && val > *max))
2336                                 continue;
2337                         *i = val;
2338                 } else {
2339                         val = convdiv * (*i) / convmul;
2340                         if (!first) {
2341                                 err = proc_put_char(&buffer, &left, '\t');
2342                                 if (err)
2343                                         break;
2344                         }
2345                         err = proc_put_long(&buffer, &left, val, false);
2346                         if (err)
2347                                 break;
2348                 }
2349         }
2350
2351         if (!write && !first && left && !err)
2352                 err = proc_put_char(&buffer, &left, '\n');
2353         if (write && !err)
2354                 left -= proc_skip_spaces(&kbuf);
2355 free:
2356         if (write) {
2357                 free_page(page);
2358                 if (first)
2359                         return err ? : -EINVAL;
2360         }
2361         *lenp -= left;
2362 out:
2363         *ppos += *lenp;
2364         return err;
2365 }
2366
2367 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2368                                      void __user *buffer,
2369                                      size_t *lenp, loff_t *ppos,
2370                                      unsigned long convmul,
2371                                      unsigned long convdiv)
2372 {
2373         return __do_proc_doulongvec_minmax(table->data, table, write,
2374                         buffer, lenp, ppos, convmul, convdiv);
2375 }
2376
2377 /**
2378  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2379  * @table: the sysctl table
2380  * @write: %TRUE if this is a write to the sysctl file
2381  * @buffer: the user buffer
2382  * @lenp: the size of the user buffer
2383  * @ppos: file position
2384  *
2385  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2386  * values from/to the user buffer, treated as an ASCII string.
2387  *
2388  * This routine will ensure the values are within the range specified by
2389  * table->extra1 (min) and table->extra2 (max).
2390  *
2391  * Returns 0 on success.
2392  */
2393 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2394                            void __user *buffer, size_t *lenp, loff_t *ppos)
2395 {
2396     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2397 }
2398
2399 /**
2400  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2401  * @table: the sysctl table
2402  * @write: %TRUE if this is a write to the sysctl file
2403  * @buffer: the user buffer
2404  * @lenp: the size of the user buffer
2405  * @ppos: file position
2406  *
2407  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2408  * values from/to the user buffer, treated as an ASCII string. The values
2409  * are treated as milliseconds, and converted to jiffies when they are stored.
2410  *
2411  * This routine will ensure the values are within the range specified by
2412  * table->extra1 (min) and table->extra2 (max).
2413  *
2414  * Returns 0 on success.
2415  */
2416 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2417                                       void __user *buffer,
2418                                       size_t *lenp, loff_t *ppos)
2419 {
2420     return do_proc_doulongvec_minmax(table, write, buffer,
2421                                      lenp, ppos, HZ, 1000l);
2422 }
2423
2424
2425 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2426                                          int *valp,
2427                                          int write, void *data)
2428 {
2429         if (write) {
2430                 if (*lvalp > LONG_MAX / HZ)
2431                         return 1;
2432                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2433         } else {
2434                 int val = *valp;
2435                 unsigned long lval;
2436                 if (val < 0) {
2437                         *negp = true;
2438                         lval = (unsigned long)-val;
2439                 } else {
2440                         *negp = false;
2441                         lval = (unsigned long)val;
2442                 }
2443                 *lvalp = lval / HZ;
2444         }
2445         return 0;
2446 }
2447
2448 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2449                                                 int *valp,
2450                                                 int write, void *data)
2451 {
2452         if (write) {
2453                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2454                         return 1;
2455                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2456         } else {
2457                 int val = *valp;
2458                 unsigned long lval;
2459                 if (val < 0) {
2460                         *negp = true;
2461                         lval = (unsigned long)-val;
2462                 } else {
2463                         *negp = false;
2464                         lval = (unsigned long)val;
2465                 }
2466                 *lvalp = jiffies_to_clock_t(lval);
2467         }
2468         return 0;
2469 }
2470
2471 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2472                                             int *valp,
2473                                             int write, void *data)
2474 {
2475         if (write) {
2476                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2477
2478                 if (jif > INT_MAX)
2479                         return 1;
2480                 *valp = (int)jif;
2481         } else {
2482                 int val = *valp;
2483                 unsigned long lval;
2484                 if (val < 0) {
2485                         *negp = true;
2486                         lval = (unsigned long)-val;
2487                 } else {
2488                         *negp = false;
2489                         lval = (unsigned long)val;
2490                 }
2491                 *lvalp = jiffies_to_msecs(lval);
2492         }
2493         return 0;
2494 }
2495
2496 /**
2497  * proc_dointvec_jiffies - read a vector of integers as seconds
2498  * @table: the sysctl table
2499  * @write: %TRUE if this is a write to the sysctl file
2500  * @buffer: the user buffer
2501  * @lenp: the size of the user buffer
2502  * @ppos: file position
2503  *
2504  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2505  * values from/to the user buffer, treated as an ASCII string.
2506  * The values read are assumed to be in seconds, and are converted into
2507  * jiffies.
2508  *
2509  * Returns 0 on success.
2510  */
2511 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2512                           void __user *buffer, size_t *lenp, loff_t *ppos)
2513 {
2514     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2515                             do_proc_dointvec_jiffies_conv,NULL);
2516 }
2517
2518 /**
2519  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2520  * @table: the sysctl table
2521  * @write: %TRUE if this is a write to the sysctl file
2522  * @buffer: the user buffer
2523  * @lenp: the size of the user buffer
2524  * @ppos: pointer to the file position
2525  *
2526  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2527  * values from/to the user buffer, treated as an ASCII string.
2528  * The values read are assumed to be in 1/USER_HZ seconds, and
2529  * are converted into jiffies.
2530  *
2531  * Returns 0 on success.
2532  */
2533 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2534                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2535 {
2536     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2537                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2538 }
2539
2540 /**
2541  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2542  * @table: the sysctl table
2543  * @write: %TRUE if this is a write to the sysctl file
2544  * @buffer: the user buffer
2545  * @lenp: the size of the user buffer
2546  * @ppos: file position
2547  * @ppos: the current position in the file
2548  *
2549  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2550  * values from/to the user buffer, treated as an ASCII string.
2551  * The values read are assumed to be in 1/1000 seconds, and
2552  * are converted into jiffies.
2553  *
2554  * Returns 0 on success.
2555  */
2556 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2557                              void __user *buffer, size_t *lenp, loff_t *ppos)
2558 {
2559         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2560                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2561 }
2562
2563 static int proc_do_cad_pid(struct ctl_table *table, int write,
2564                            void __user *buffer, size_t *lenp, loff_t *ppos)
2565 {
2566         struct pid *new_pid;
2567         pid_t tmp;
2568         int r;
2569
2570         tmp = pid_vnr(cad_pid);
2571
2572         r = __do_proc_dointvec(&tmp, table, write, buffer,
2573                                lenp, ppos, NULL, NULL);
2574         if (r || !write)
2575                 return r;
2576
2577         new_pid = find_get_pid(tmp);
2578         if (!new_pid)
2579                 return -ESRCH;
2580
2581         put_pid(xchg(&cad_pid, new_pid));
2582         return 0;
2583 }
2584
2585 /**
2586  * proc_do_large_bitmap - read/write from/to a large bitmap
2587  * @table: the sysctl table
2588  * @write: %TRUE if this is a write to the sysctl file
2589  * @buffer: the user buffer
2590  * @lenp: the size of the user buffer
2591  * @ppos: file position
2592  *
2593  * The bitmap is stored at table->data and the bitmap length (in bits)
2594  * in table->maxlen.
2595  *
2596  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2597  * large bitmaps may be represented in a compact manner. Writing into
2598  * the file will clear the bitmap then update it with the given input.
2599  *
2600  * Returns 0 on success.
2601  */
2602 int proc_do_large_bitmap(struct ctl_table *table, int write,
2603                          void __user *buffer, size_t *lenp, loff_t *ppos)
2604 {
2605         int err = 0;
2606         bool first = 1;
2607         size_t left = *lenp;
2608         unsigned long bitmap_len = table->maxlen;
2609         unsigned long *bitmap = *(unsigned long **) table->data;
2610         unsigned long *tmp_bitmap = NULL;
2611         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2612
2613         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2614                 *lenp = 0;
2615                 return 0;
2616         }
2617
2618         if (write) {
2619                 unsigned long page = 0;
2620                 char *kbuf;
2621
2622                 if (left > PAGE_SIZE - 1)
2623                         left = PAGE_SIZE - 1;
2624
2625                 page = __get_free_page(GFP_TEMPORARY);
2626                 kbuf = (char *) page;
2627                 if (!kbuf)
2628                         return -ENOMEM;
2629                 if (copy_from_user(kbuf, buffer, left)) {
2630                         free_page(page);
2631                         return -EFAULT;
2632                 }
2633                 kbuf[left] = 0;
2634
2635                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2636                                      GFP_KERNEL);
2637                 if (!tmp_bitmap) {
2638                         free_page(page);
2639                         return -ENOMEM;
2640                 }
2641                 proc_skip_char(&kbuf, &left, '\n');
2642                 while (!err && left) {
2643                         unsigned long val_a, val_b;
2644                         bool neg;
2645
2646                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2647                                              sizeof(tr_a), &c);
2648                         if (err)
2649                                 break;
2650                         if (val_a >= bitmap_len || neg) {
2651                                 err = -EINVAL;
2652                                 break;
2653                         }
2654
2655                         val_b = val_a;
2656                         if (left) {
2657                                 kbuf++;
2658                                 left--;
2659                         }
2660
2661                         if (c == '-') {
2662                                 err = proc_get_long(&kbuf, &left, &val_b,
2663                                                      &neg, tr_b, sizeof(tr_b),
2664                                                      &c);
2665                                 if (err)
2666                                         break;
2667                                 if (val_b >= bitmap_len || neg ||
2668                                     val_a > val_b) {
2669                                         err = -EINVAL;
2670                                         break;
2671                                 }
2672                                 if (left) {
2673                                         kbuf++;
2674                                         left--;
2675                                 }
2676                         }
2677
2678                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2679                         first = 0;
2680                         proc_skip_char(&kbuf, &left, '\n');
2681                 }
2682                 free_page(page);
2683         } else {
2684                 unsigned long bit_a, bit_b = 0;
2685
2686                 while (left) {
2687                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2688                         if (bit_a >= bitmap_len)
2689                                 break;
2690                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2691                                                    bit_a + 1) - 1;
2692
2693                         if (!first) {
2694                                 err = proc_put_char(&buffer, &left, ',');
2695                                 if (err)
2696                                         break;
2697                         }
2698                         err = proc_put_long(&buffer, &left, bit_a, false);
2699                         if (err)
2700                                 break;
2701                         if (bit_a != bit_b) {
2702                                 err = proc_put_char(&buffer, &left, '-');
2703                                 if (err)
2704                                         break;
2705                                 err = proc_put_long(&buffer, &left, bit_b, false);
2706                                 if (err)
2707                                         break;
2708                         }
2709
2710                         first = 0; bit_b++;
2711                 }
2712                 if (!err)
2713                         err = proc_put_char(&buffer, &left, '\n');
2714         }
2715
2716         if (!err) {
2717                 if (write) {
2718                         if (*ppos)
2719                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2720                         else
2721                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2722                 }
2723                 kfree(tmp_bitmap);
2724                 *lenp -= left;
2725                 *ppos += *lenp;
2726                 return 0;
2727         } else {
2728                 kfree(tmp_bitmap);
2729                 return err;
2730         }
2731 }
2732
2733 #else /* CONFIG_PROC_SYSCTL */
2734
2735 int proc_dostring(struct ctl_table *table, int write,
2736                   void __user *buffer, size_t *lenp, loff_t *ppos)
2737 {
2738         return -ENOSYS;
2739 }
2740
2741 int proc_dointvec(struct ctl_table *table, int write,
2742                   void __user *buffer, size_t *lenp, loff_t *ppos)
2743 {
2744         return -ENOSYS;
2745 }
2746
2747 int proc_dointvec_minmax(struct ctl_table *table, int write,
2748                     void __user *buffer, size_t *lenp, loff_t *ppos)
2749 {
2750         return -ENOSYS;
2751 }
2752
2753 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2754                     void __user *buffer, size_t *lenp, loff_t *ppos)
2755 {
2756         return -ENOSYS;
2757 }
2758
2759 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2760                     void __user *buffer, size_t *lenp, loff_t *ppos)
2761 {
2762         return -ENOSYS;
2763 }
2764
2765 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2766                              void __user *buffer, size_t *lenp, loff_t *ppos)
2767 {
2768         return -ENOSYS;
2769 }
2770
2771 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2772                     void __user *buffer, size_t *lenp, loff_t *ppos)
2773 {
2774         return -ENOSYS;
2775 }
2776
2777 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2778                                       void __user *buffer,
2779                                       size_t *lenp, loff_t *ppos)
2780 {
2781     return -ENOSYS;
2782 }
2783
2784
2785 #endif /* CONFIG_PROC_SYSCTL */
2786
2787 /*
2788  * No sense putting this after each symbol definition, twice,
2789  * exception granted :-)
2790  */
2791 EXPORT_SYMBOL(proc_dointvec);
2792 EXPORT_SYMBOL(proc_dointvec_jiffies);
2793 EXPORT_SYMBOL(proc_dointvec_minmax);
2794 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2795 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2796 EXPORT_SYMBOL(proc_dostring);
2797 EXPORT_SYMBOL(proc_doulongvec_minmax);
2798 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);