kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/swap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/bitmap.h>
  27 #include <linux/signal.h>
  28 #include <linux/printk.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/security.h>
  31 #include <linux/ctype.h>
  32 #include <linux/kmemcheck.h>
  33 #include <linux/kmemleak.h>
  34 #include <linux/fs.h>
  35 #include <linux/init.h>
  36 #include <linux/kernel.h>
  37 #include <linux/kobject.h>
  38 #include <linux/net.h>
  39 #include <linux/sysrq.h>
  40 #include <linux/highuid.h>
  41 #include <linux/writeback.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/compaction.h>
  44 #include <linux/hugetlb.h>
  45 #include <linux/initrd.h>
  46 #include <linux/key.h>
  47 #include <linux/times.h>
  48 #include <linux/limits.h>
  49 #include <linux/dcache.h>
  50 #include <linux/dnotify.h>
  51 #include <linux/syscalls.h>
  52 #include <linux/vmstat.h>
  53 #include <linux/nfs_fs.h>
  54 #include <linux/acpi.h>
  55 #include <linux/reboot.h>
  56 #include <linux/ftrace.h>
  57 #include <linux/perf_event.h>
  58 #include <linux/kprobes.h>
  59 #include <linux/pipe_fs_i.h>
  60 #include <linux/oom.h>
  61 #include <linux/kmod.h>
  62 #include <linux/capability.h>
  63 #include <linux/binfmts.h>
  64 #include <linux/sched/sysctl.h>
  65 #include <linux/kexec.h>
  66
  67 #include <asm/uaccess.h>
  68 #include <asm/processor.h>
  69
  70 #ifdef CONFIG_X86
  71 #include <asm/nmi.h>
  72 #include <asm/stacktrace.h>
  73 #include <asm/io.h>
  74 #endif
  75 #ifdef CONFIG_SPARC
  76 #include <asm/setup.h>
  77 #endif
  78 #ifdef CONFIG_BSD_PROCESS_ACCT
  79 #include <linux/acct.h>
  80 #endif
  81 #ifdef CONFIG_RT_MUTEXES
  82 #include <linux/rtmutex.h>
  83 #endif
  84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  85 #include <linux/lockdep.h>
  86 #endif
  87 #ifdef CONFIG_CHR_DEV_SG
  88 #include <scsi/sg.h>
  89 #endif
  90
  91 #ifdef CONFIG_LOCKUP_DETECTOR
  92 #include <linux/nmi.h>
  93 #endif
  94
  95
  96 #if defined(CONFIG_SYSCTL)
  97
  98 /* External variables not in a header file. */
  99 extern int max_threads;
 100 extern int suid_dumpable;
 101 #ifdef CONFIG_COREDUMP
 102 extern int core_uses_pid;
 103 extern char core_pattern[];
 104 extern unsigned int core_pipe_limit;
 105 #endif
 106 extern int pid_max;
 107 extern int extra_free_kbytes;
 108 extern int pid_max_min, pid_max_max;
 109 extern int percpu_pagelist_fraction;
 110 extern int compat_log;
 111 extern int latencytop_enabled;
 112 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 113 #ifndef CONFIG_MMU
 114 extern int sysctl_nr_trim_pages;
 115 #endif
 116
 117 /* Constants used for minimum and  maximum */
 118 #ifdef CONFIG_LOCKUP_DETECTOR
 119 static int sixty = 60;
 120 #endif
 121
 122 static int __maybe_unused neg_one = -1;
 123
 124 static int zero;
 125 static int __maybe_unused one = 1;
 126 static int __maybe_unused two = 2;
 127 static int __maybe_unused four = 4;
 128 static unsigned long one_ul = 1;
 129 static int one_hundred = 100;
 130 #ifdef CONFIG_PRINTK
 131 static int ten_thousand = 10000;
 132 #endif
 133
 134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 136
 137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 138 static int maxolduid = 65535;
 139 static int minolduid;
 140
 141 static int ngroups_max = NGROUPS_MAX;
 142 static const int cap_last_cap = CAP_LAST_CAP;
 143
 144 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
 145 #ifdef CONFIG_DETECT_HUNG_TASK
 146 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 147 #endif
 148
 149 #ifdef CONFIG_INOTIFY_USER
 150 #include <linux/inotify.h>
 151 #endif
 152 #ifdef CONFIG_SPARC
 153 #endif
 154
 155 #ifdef __hppa__
 156 extern int pwrsw_enabled;
 157 #endif
 158
 159 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 160 extern int unaligned_enabled;
 161 #endif
 162
 163 #ifdef CONFIG_IA64
 164 extern int unaligned_dump_stack;
 165 #endif
 166
 167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 168 extern int no_unaligned_warning;
 169 #endif
 170
 171 #ifdef CONFIG_PROC_SYSCTL
 172
 173 #define SYSCTL_WRITES_LEGACY    -1
 174 #define SYSCTL_WRITES_WARN       0
 175 #define SYSCTL_WRITES_STRICT     1
 176
 177 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
 178
 179 static int proc_do_cad_pid(struct ctl_table *table, int write,
 180                   void __user *buffer, size_t *lenp, loff_t *ppos);
 181 static int proc_taint(struct ctl_table *table, int write,
 182                                void __user *buffer, size_t *lenp, loff_t *ppos);
 183 #endif
 184
 185 #ifdef CONFIG_PRINTK
 186 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 187                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 188 #endif
 189
 190 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 191                 void __user *buffer, size_t *lenp, loff_t *ppos);
 192 #ifdef CONFIG_COREDUMP
 193 static int proc_dostring_coredump(struct ctl_table *table, int write,
 194                 void __user *buffer, size_t *lenp, loff_t *ppos);
 195 #endif
 196
 197 #ifdef CONFIG_MAGIC_SYSRQ
 198 /* Note: sysrq code uses it's own private copy */
 199 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 200
 201 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 202                                 void __user *buffer, size_t *lenp,
 203                                 loff_t *ppos)
 204 {
 205         int error;
 206
 207         error = proc_dointvec(table, write, buffer, lenp, ppos);
 208         if (error)
 209                 return error;
 210
 211         if (write)
 212                 sysrq_toggle_support(__sysrq_enabled);
 213
 214         return 0;
 215 }
 216
 217 #endif
 218
 219 static struct ctl_table kern_table[];
 220 static struct ctl_table vm_table[];
 221 static struct ctl_table fs_table[];
 222 static struct ctl_table debug_table[];
 223 static struct ctl_table dev_table[];
 224 extern struct ctl_table random_table[];
 225 #ifdef CONFIG_EPOLL
 226 extern struct ctl_table epoll_table[];
 227 #endif
 228
 229 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 230 int sysctl_legacy_va_layout;
 231 #endif
 232
 233 /* The default sysctl tables: */
 234
 235 static struct ctl_table sysctl_base_table[] = {
 236         {
 237                 .procname       = "kernel",
 238                 .mode           = 0555,
 239                 .child          = kern_table,
 240         },
 241         {
 242                 .procname       = "vm",
 243                 .mode           = 0555,
 244                 .child          = vm_table,
 245         },
 246         {
 247                 .procname       = "fs",
 248                 .mode           = 0555,
 249                 .child          = fs_table,
 250         },
 251         {
 252                 .procname       = "debug",
 253                 .mode           = 0555,
 254                 .child          = debug_table,
 255         },
 256         {
 257                 .procname       = "dev",
 258                 .mode           = 0555,
 259                 .child          = dev_table,
 260         },
 261         { }
 262 };
 263
 264 #ifdef CONFIG_SCHED_DEBUG
 265 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 266 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 267 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 268 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 269 #ifdef CONFIG_SMP
 270 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 271 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 272 #endif /* CONFIG_SMP */
 273 #endif /* CONFIG_SCHED_DEBUG */
 274
 275 #ifdef CONFIG_COMPACTION
 276 static int min_extfrag_threshold;
 277 static int max_extfrag_threshold = 1000;
 278 #endif
 279
 280 static struct ctl_table kern_table[] = {
 281         {
 282                 .procname       = "sched_child_runs_first",
 283                 .data           = &sysctl_sched_child_runs_first,
 284                 .maxlen         = sizeof(unsigned int),
 285                 .mode           = 0644,
 286                 .proc_handler   = proc_dointvec,
 287         },
 288 #ifdef CONFIG_SCHED_DEBUG
 289         {
 290                 .procname       = "sched_min_granularity_ns",
 291                 .data           = &sysctl_sched_min_granularity,
 292                 .maxlen         = sizeof(unsigned int),
 293                 .mode           = 0644,
 294                 .proc_handler   = sched_proc_update_handler,
 295                 .extra1         = &min_sched_granularity_ns,
 296                 .extra2         = &max_sched_granularity_ns,
 297         },
 298         {
 299                 .procname       = "sched_latency_ns",
 300                 .data           = &sysctl_sched_latency,
 301                 .maxlen         = sizeof(unsigned int),
 302                 .mode           = 0644,
 303                 .proc_handler   = sched_proc_update_handler,
 304                 .extra1         = &min_sched_granularity_ns,
 305                 .extra2         = &max_sched_granularity_ns,
 306         },
 307         {
 308                 .procname       = "sched_wakeup_granularity_ns",
 309                 .data           = &sysctl_sched_wakeup_granularity,
 310                 .maxlen         = sizeof(unsigned int),
 311                 .mode           = 0644,
 312                 .proc_handler   = sched_proc_update_handler,
 313                 .extra1         = &min_wakeup_granularity_ns,
 314                 .extra2         = &max_wakeup_granularity_ns,
 315         },
 316 #ifdef CONFIG_SMP
 317         {
 318                 .procname       = "sched_tunable_scaling",
 319                 .data           = &sysctl_sched_tunable_scaling,
 320                 .maxlen         = sizeof(enum sched_tunable_scaling),
 321                 .mode           = 0644,
 322                 .proc_handler   = sched_proc_update_handler,
 323                 .extra1         = &min_sched_tunable_scaling,
 324                 .extra2         = &max_sched_tunable_scaling,
 325         },
 326         {
 327                 .procname       = "sched_migration_cost_ns",
 328                 .data           = &sysctl_sched_migration_cost,
 329                 .maxlen         = sizeof(unsigned int),
 330                 .mode           = 0644,
 331                 .proc_handler   = proc_dointvec,
 332         },
 333         {
 334                 .procname       = "sched_nr_migrate",
 335                 .data           = &sysctl_sched_nr_migrate,
 336                 .maxlen         = sizeof(unsigned int),
 337                 .mode           = 0644,
 338                 .proc_handler   = proc_dointvec,
 339         },
 340         {
 341                 .procname       = "sched_time_avg_ms",
 342                 .data           = &sysctl_sched_time_avg,
 343                 .maxlen         = sizeof(unsigned int),
 344                 .mode           = 0644,
 345                 .proc_handler   = proc_dointvec,
 346         },
 347         {
 348                 .procname       = "sched_shares_window_ns",
 349                 .data           = &sysctl_sched_shares_window,
 350                 .maxlen         = sizeof(unsigned int),
 351                 .mode           = 0644,
 352                 .proc_handler   = proc_dointvec,
 353         },
 354         {
 355                 .procname       = "timer_migration",
 356                 .data           = &sysctl_timer_migration,
 357                 .maxlen         = sizeof(unsigned int),
 358                 .mode           = 0644,
 359                 .proc_handler   = proc_dointvec_minmax,
 360                 .extra1         = &zero,
 361                 .extra2         = &one,
 362         },
 363 #endif /* CONFIG_SMP */
 364 #ifdef CONFIG_NUMA_BALANCING
 365         {
 366                 .procname       = "numa_balancing_scan_delay_ms",
 367                 .data           = &sysctl_numa_balancing_scan_delay,
 368                 .maxlen         = sizeof(unsigned int),
 369                 .mode           = 0644,
 370                 .proc_handler   = proc_dointvec,
 371         },
 372         {
 373                 .procname       = "numa_balancing_scan_period_min_ms",
 374                 .data           = &sysctl_numa_balancing_scan_period_min,
 375                 .maxlen         = sizeof(unsigned int),
 376                 .mode           = 0644,
 377                 .proc_handler   = proc_dointvec,
 378         },
 379         {
 380                 .procname       = "numa_balancing_scan_period_max_ms",
 381                 .data           = &sysctl_numa_balancing_scan_period_max,
 382                 .maxlen         = sizeof(unsigned int),
 383                 .mode           = 0644,
 384                 .proc_handler   = proc_dointvec,
 385         },
 386         {
 387                 .procname       = "numa_balancing_scan_size_mb",
 388                 .data           = &sysctl_numa_balancing_scan_size,
 389                 .maxlen         = sizeof(unsigned int),
 390                 .mode           = 0644,
 391                 .proc_handler   = proc_dointvec_minmax,
 392                 .extra1         = &one,
 393         },
 394         {
 395                 .procname       = "numa_balancing",
 396                 .data           = NULL, /* filled in by handler */
 397                 .maxlen         = sizeof(unsigned int),
 398                 .mode           = 0644,
 399                 .proc_handler   = sysctl_numa_balancing,
 400                 .extra1         = &zero,
 401                 .extra2         = &one,
 402         },
 403 #endif /* CONFIG_NUMA_BALANCING */
 404 #endif /* CONFIG_SCHED_DEBUG */
 405         {
 406                 .procname       = "sched_rt_period_us",
 407                 .data           = &sysctl_sched_rt_period,
 408                 .maxlen         = sizeof(unsigned int),
 409                 .mode           = 0644,
 410                 .proc_handler   = sched_rt_handler,
 411         },
 412         {
 413                 .procname       = "sched_rt_runtime_us",
 414                 .data           = &sysctl_sched_rt_runtime,
 415                 .maxlen         = sizeof(int),
 416                 .mode           = 0644,
 417                 .proc_handler   = sched_rt_handler,
 418         },
 419         {
 420                 .procname       = "sched_rr_timeslice_ms",
 421                 .data           = &sched_rr_timeslice,
 422                 .maxlen         = sizeof(int),
 423                 .mode           = 0644,
 424                 .proc_handler   = sched_rr_handler,
 425         },
 426 #ifdef CONFIG_SCHED_AUTOGROUP
 427         {
 428                 .procname       = "sched_autogroup_enabled",
 429                 .data           = &sysctl_sched_autogroup_enabled,
 430                 .maxlen         = sizeof(unsigned int),
 431                 .mode           = 0644,
 432                 .proc_handler   = proc_dointvec_minmax,
 433                 .extra1         = &zero,
 434                 .extra2         = &one,
 435         },
 436 #endif
 437 #ifdef CONFIG_CFS_BANDWIDTH
 438         {
 439                 .procname       = "sched_cfs_bandwidth_slice_us",
 440                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 441                 .maxlen         = sizeof(unsigned int),
 442                 .mode           = 0644,
 443                 .proc_handler   = proc_dointvec_minmax,
 444                 .extra1         = &one,
 445         },
 446 #endif
 447 #ifdef CONFIG_PROVE_LOCKING
 448         {
 449                 .procname       = "prove_locking",
 450                 .data           = &prove_locking,
 451                 .maxlen         = sizeof(int),
 452                 .mode           = 0644,
 453                 .proc_handler   = proc_dointvec,
 454         },
 455 #endif
 456 #ifdef CONFIG_LOCK_STAT
 457         {
 458                 .procname       = "lock_stat",
 459                 .data           = &lock_stat,
 460                 .maxlen         = sizeof(int),
 461                 .mode           = 0644,
 462                 .proc_handler   = proc_dointvec,
 463         },
 464 #endif
 465         {
 466                 .procname       = "panic",
 467                 .data           = &panic_timeout,
 468                 .maxlen         = sizeof(int),
 469                 .mode           = 0644,
 470                 .proc_handler   = proc_dointvec,
 471         },
 472 #ifdef CONFIG_COREDUMP
 473         {
 474                 .procname       = "core_uses_pid",
 475                 .data           = &core_uses_pid,
 476                 .maxlen         = sizeof(int),
 477                 .mode           = 0644,
 478                 .proc_handler   = proc_dointvec,
 479         },
 480         {
 481                 .procname       = "core_pattern",
 482                 .data           = core_pattern,
 483                 .maxlen         = CORENAME_MAX_SIZE,
 484                 .mode           = 0644,
 485                 .proc_handler   = proc_dostring_coredump,
 486         },
 487         {
 488                 .procname       = "core_pipe_limit",
 489                 .data           = &core_pipe_limit,
 490                 .maxlen         = sizeof(unsigned int),
 491                 .mode           = 0644,
 492                 .proc_handler   = proc_dointvec,
 493         },
 494 #endif
 495 #ifdef CONFIG_PROC_SYSCTL
 496         {
 497                 .procname       = "tainted",
 498                 .maxlen         = sizeof(long),
 499                 .mode           = 0644,
 500                 .proc_handler   = proc_taint,
 501         },
 502         {
 503                 .procname       = "sysctl_writes_strict",
 504                 .data           = &sysctl_writes_strict,
 505                 .maxlen         = sizeof(int),
 506                 .mode           = 0644,
 507                 .proc_handler   = proc_dointvec_minmax,
 508                 .extra1         = &neg_one,
 509                 .extra2         = &one,
 510         },
 511 #endif
 512 #ifdef CONFIG_LATENCYTOP
 513         {
 514                 .procname       = "latencytop",
 515                 .data           = &latencytop_enabled,
 516                 .maxlen         = sizeof(int),
 517                 .mode           = 0644,
 518                 .proc_handler   = proc_dointvec,
 519         },
 520 #endif
 521 #ifdef CONFIG_BLK_DEV_INITRD
 522         {
 523                 .procname       = "real-root-dev",
 524                 .data           = &real_root_dev,
 525                 .maxlen         = sizeof(int),
 526                 .mode           = 0644,
 527                 .proc_handler   = proc_dointvec,
 528         },
 529 #endif
 530         {
 531                 .procname       = "print-fatal-signals",
 532                 .data           = &print_fatal_signals,
 533                 .maxlen         = sizeof(int),
 534                 .mode           = 0644,
 535                 .proc_handler   = proc_dointvec,
 536         },
 537 #ifdef CONFIG_SPARC
 538         {
 539                 .procname       = "reboot-cmd",
 540                 .data           = reboot_command,
 541                 .maxlen         = 256,
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_dostring,
 544         },
 545         {
 546                 .procname       = "stop-a",
 547                 .data           = &stop_a_enabled,
 548                 .maxlen         = sizeof (int),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_dointvec,
 551         },
 552         {
 553                 .procname       = "scons-poweroff",
 554                 .data           = &scons_pwroff,
 555                 .maxlen         = sizeof (int),
 556                 .mode           = 0644,
 557                 .proc_handler   = proc_dointvec,
 558         },
 559 #endif
 560 #ifdef CONFIG_SPARC64
 561         {
 562                 .procname       = "tsb-ratio",
 563                 .data           = &sysctl_tsb_ratio,
 564                 .maxlen         = sizeof (int),
 565                 .mode           = 0644,
 566                 .proc_handler   = proc_dointvec,
 567         },
 568 #endif
 569 #ifdef __hppa__
 570         {
 571                 .procname       = "soft-power",
 572                 .data           = &pwrsw_enabled,
 573                 .maxlen         = sizeof (int),
 574                 .mode           = 0644,
 575                 .proc_handler   = proc_dointvec,
 576         },
 577 #endif
 578 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 579         {
 580                 .procname       = "unaligned-trap",
 581                 .data           = &unaligned_enabled,
 582                 .maxlen         = sizeof (int),
 583                 .mode           = 0644,
 584                 .proc_handler   = proc_dointvec,
 585         },
 586 #endif
 587         {
 588                 .procname       = "ctrl-alt-del",
 589                 .data           = &C_A_D,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = proc_dointvec,
 593         },
 594 #ifdef CONFIG_FUNCTION_TRACER
 595         {
 596                 .procname       = "ftrace_enabled",
 597                 .data           = &ftrace_enabled,
 598                 .maxlen         = sizeof(int),
 599                 .mode           = 0644,
 600                 .proc_handler   = ftrace_enable_sysctl,
 601         },
 602 #endif
 603 #ifdef CONFIG_STACK_TRACER
 604         {
 605                 .procname       = "stack_tracer_enabled",
 606                 .data           = &stack_tracer_enabled,
 607                 .maxlen         = sizeof(int),
 608                 .mode           = 0644,
 609                 .proc_handler   = stack_trace_sysctl,
 610         },
 611 #endif
 612 #ifdef CONFIG_TRACING
 613         {
 614                 .procname       = "ftrace_dump_on_oops",
 615                 .data           = &ftrace_dump_on_oops,
 616                 .maxlen         = sizeof(int),
 617                 .mode           = 0644,
 618                 .proc_handler   = proc_dointvec,
 619         },
 620         {
 621                 .procname       = "traceoff_on_warning",
 622                 .data           = &__disable_trace_on_warning,
 623                 .maxlen         = sizeof(__disable_trace_on_warning),
 624                 .mode           = 0644,
 625                 .proc_handler   = proc_dointvec,
 626         },
 627         {
 628                 .procname       = "tracepoint_printk",
 629                 .data           = &tracepoint_printk,
 630                 .maxlen         = sizeof(tracepoint_printk),
 631                 .mode           = 0644,
 632                 .proc_handler   = proc_dointvec,
 633         },
 634 #endif
 635 #ifdef CONFIG_KEXEC
 636         {
 637                 .procname       = "kexec_load_disabled",
 638                 .data           = &kexec_load_disabled,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 /* only handle a transition from default "0" to "1" */
 642                 .proc_handler   = proc_dointvec_minmax,
 643                 .extra1         = &one,
 644                 .extra2         = &one,
 645         },
 646 #endif
 647 #ifdef CONFIG_MODULES
 648         {
 649                 .procname       = "modprobe",
 650                 .data           = &modprobe_path,
 651                 .maxlen         = KMOD_PATH_LEN,
 652                 .mode           = 0644,
 653                 .proc_handler   = proc_dostring,
 654         },
 655         {
 656                 .procname       = "modules_disabled",
 657                 .data           = &modules_disabled,
 658                 .maxlen         = sizeof(int),
 659                 .mode           = 0644,
 660                 /* only handle a transition from default "0" to "1" */
 661                 .proc_handler   = proc_dointvec_minmax,
 662                 .extra1         = &one,
 663                 .extra2         = &one,
 664         },
 665 #endif
 666 #ifdef CONFIG_UEVENT_HELPER
 667         {
 668                 .procname       = "hotplug",
 669                 .data           = &uevent_helper,
 670                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 671                 .mode           = 0644,
 672                 .proc_handler   = proc_dostring,
 673         },
 674 #endif
 675 #ifdef CONFIG_CHR_DEV_SG
 676         {
 677                 .procname       = "sg-big-buff",
 678                 .data           = &sg_big_buff,
 679                 .maxlen         = sizeof (int),
 680                 .mode           = 0444,
 681                 .proc_handler   = proc_dointvec,
 682         },
 683 #endif
 684 #ifdef CONFIG_BSD_PROCESS_ACCT
 685         {
 686                 .procname       = "acct",
 687                 .data           = &acct_parm,
 688                 .maxlen         = 3*sizeof(int),
 689                 .mode           = 0644,
 690                 .proc_handler   = proc_dointvec,
 691         },
 692 #endif
 693 #ifdef CONFIG_MAGIC_SYSRQ
 694         {
 695                 .procname       = "sysrq",
 696                 .data           = &__sysrq_enabled,
 697                 .maxlen         = sizeof (int),
 698                 .mode           = 0644,
 699                 .proc_handler   = sysrq_sysctl_handler,
 700         },
 701 #endif
 702 #ifdef CONFIG_PROC_SYSCTL
 703         {
 704                 .procname       = "cad_pid",
 705                 .data           = NULL,
 706                 .maxlen         = sizeof (int),
 707                 .mode           = 0600,
 708                 .proc_handler   = proc_do_cad_pid,
 709         },
 710 #endif
 711         {
 712                 .procname       = "threads-max",
 713                 .data           = &max_threads,
 714                 .maxlen         = sizeof(int),
 715                 .mode           = 0644,
 716                 .proc_handler   = proc_dointvec,
 717         },
 718         {
 719                 .procname       = "random",
 720                 .mode           = 0555,
 721                 .child          = random_table,
 722         },
 723         {
 724                 .procname       = "usermodehelper",
 725                 .mode           = 0555,
 726                 .child          = usermodehelper_table,
 727         },
 728         {
 729                 .procname       = "overflowuid",
 730                 .data           = &overflowuid,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_dointvec_minmax,
 734                 .extra1         = &minolduid,
 735                 .extra2         = &maxolduid,
 736         },
 737         {
 738                 .procname       = "overflowgid",
 739                 .data           = &overflowgid,
 740                 .maxlen         = sizeof(int),
 741                 .mode           = 0644,
 742                 .proc_handler   = proc_dointvec_minmax,
 743                 .extra1         = &minolduid,
 744                 .extra2         = &maxolduid,
 745         },
 746 #ifdef CONFIG_S390
 747 #ifdef CONFIG_MATHEMU
 748         {
 749                 .procname       = "ieee_emulation_warnings",
 750                 .data           = &sysctl_ieee_emulation_warnings,
 751                 .maxlen         = sizeof(int),
 752                 .mode           = 0644,
 753                 .proc_handler   = proc_dointvec,
 754         },
 755 #endif
 756         {
 757                 .procname       = "userprocess_debug",
 758                 .data           = &show_unhandled_signals,
 759                 .maxlen         = sizeof(int),
 760                 .mode           = 0644,
 761                 .proc_handler   = proc_dointvec,
 762         },
 763 #endif
 764         {
 765                 .procname       = "pid_max",
 766                 .data           = &pid_max,
 767                 .maxlen         = sizeof (int),
 768                 .mode           = 0644,
 769                 .proc_handler   = proc_dointvec_minmax,
 770                 .extra1         = &pid_max_min,
 771                 .extra2         = &pid_max_max,
 772         },
 773         {
 774                 .procname       = "panic_on_oops",
 775                 .data           = &panic_on_oops,
 776                 .maxlen         = sizeof(int),
 777                 .mode           = 0644,
 778                 .proc_handler   = proc_dointvec,
 779         },
 780 #if defined CONFIG_PRINTK
 781         {
 782                 .procname       = "printk",
 783                 .data           = &console_loglevel,
 784                 .maxlen         = 4*sizeof(int),
 785                 .mode           = 0644,
 786                 .proc_handler   = proc_dointvec,
 787         },
 788         {
 789                 .procname       = "printk_ratelimit",
 790                 .data           = &printk_ratelimit_state.interval,
 791                 .maxlen         = sizeof(int),
 792                 .mode           = 0644,
 793                 .proc_handler   = proc_dointvec_jiffies,
 794         },
 795         {
 796                 .procname       = "printk_ratelimit_burst",
 797                 .data           = &printk_ratelimit_state.burst,
 798                 .maxlen         = sizeof(int),
 799                 .mode           = 0644,
 800                 .proc_handler   = proc_dointvec,
 801         },
 802         {
 803                 .procname       = "printk_delay",
 804                 .data           = &printk_delay_msec,
 805                 .maxlen         = sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = proc_dointvec_minmax,
 808                 .extra1         = &zero,
 809                 .extra2         = &ten_thousand,
 810         },
 811         {
 812                 .procname       = "dmesg_restrict",
 813                 .data           = &dmesg_restrict,
 814                 .maxlen         = sizeof(int),
 815                 .mode           = 0644,
 816                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 817                 .extra1         = &zero,
 818                 .extra2         = &one,
 819         },
 820         {
 821                 .procname       = "kptr_restrict",
 822                 .data           = &kptr_restrict,
 823                 .maxlen         = sizeof(int),
 824                 .mode           = 0644,
 825                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 826                 .extra1         = &zero,
 827                 .extra2         = &two,
 828         },
 829 #endif
 830         {
 831                 .procname       = "ngroups_max",
 832                 .data           = &ngroups_max,
 833                 .maxlen         = sizeof (int),
 834                 .mode           = 0444,
 835                 .proc_handler   = proc_dointvec,
 836         },
 837         {
 838                 .procname       = "cap_last_cap",
 839                 .data           = (void *)&cap_last_cap,
 840                 .maxlen         = sizeof(int),
 841                 .mode           = 0444,
 842                 .proc_handler   = proc_dointvec,
 843         },
 844 #if defined(CONFIG_LOCKUP_DETECTOR)
 845         {
 846                 .procname       = "watchdog",
 847                 .data           = &watchdog_user_enabled,
 848                 .maxlen         = sizeof (int),
 849                 .mode           = 0644,
 850                 .proc_handler   = proc_dowatchdog,
 851                 .extra1         = &zero,
 852                 .extra2         = &one,
 853         },
 854         {
 855                 .procname       = "watchdog_thresh",
 856                 .data           = &watchdog_thresh,
 857                 .maxlen         = sizeof(int),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_dowatchdog,
 860                 .extra1         = &zero,
 861                 .extra2         = &sixty,
 862         },
 863         {
 864                 .procname       = "softlockup_panic",
 865                 .data           = &softlockup_panic,
 866                 .maxlen         = sizeof(int),
 867                 .mode           = 0644,
 868                 .proc_handler   = proc_dointvec_minmax,
 869                 .extra1         = &zero,
 870                 .extra2         = &one,
 871         },
 872 #ifdef CONFIG_SMP
 873         {
 874                 .procname       = "softlockup_all_cpu_backtrace",
 875                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 876                 .maxlen         = sizeof(int),
 877                 .mode           = 0644,
 878                 .proc_handler   = proc_dointvec_minmax,
 879                 .extra1         = &zero,
 880                 .extra2         = &one,
 881         },
 882 #endif /* CONFIG_SMP */
 883         {
 884                 .procname       = "nmi_watchdog",
 885                 .data           = &watchdog_user_enabled,
 886                 .maxlen         = sizeof (int),
 887                 .mode           = 0644,
 888                 .proc_handler   = proc_dowatchdog,
 889                 .extra1         = &zero,
 890                 .extra2         = &one,
 891         },
 892 #endif
 893 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 894         {
 895                 .procname       = "unknown_nmi_panic",
 896                 .data           = &unknown_nmi_panic,
 897                 .maxlen         = sizeof (int),
 898                 .mode           = 0644,
 899                 .proc_handler   = proc_dointvec,
 900         },
 901 #endif
 902 #if defined(CONFIG_X86)
 903         {
 904                 .procname       = "panic_on_unrecovered_nmi",
 905                 .data           = &panic_on_unrecovered_nmi,
 906                 .maxlen         = sizeof(int),
 907                 .mode           = 0644,
 908                 .proc_handler   = proc_dointvec,
 909         },
 910         {
 911                 .procname       = "panic_on_io_nmi",
 912                 .data           = &panic_on_io_nmi,
 913                 .maxlen         = sizeof(int),
 914                 .mode           = 0644,
 915                 .proc_handler   = proc_dointvec,
 916         },
 917 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 918         {
 919                 .procname       = "panic_on_stackoverflow",
 920                 .data           = &sysctl_panic_on_stackoverflow,
 921                 .maxlen         = sizeof(int),
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_dointvec,
 924         },
 925 #endif
 926         {
 927                 .procname       = "bootloader_type",
 928                 .data           = &bootloader_type,
 929                 .maxlen         = sizeof (int),
 930                 .mode           = 0444,
 931                 .proc_handler   = proc_dointvec,
 932         },
 933         {
 934                 .procname       = "bootloader_version",
 935                 .data           = &bootloader_version,
 936                 .maxlen         = sizeof (int),
 937                 .mode           = 0444,
 938                 .proc_handler   = proc_dointvec,
 939         },
 940         {
 941                 .procname       = "kstack_depth_to_print",
 942                 .data           = &kstack_depth_to_print,
 943                 .maxlen         = sizeof(int),
 944                 .mode           = 0644,
 945                 .proc_handler   = proc_dointvec,
 946         },
 947         {
 948                 .procname       = "io_delay_type",
 949                 .data           = &io_delay_type,
 950                 .maxlen         = sizeof(int),
 951                 .mode           = 0644,
 952                 .proc_handler   = proc_dointvec,
 953         },
 954 #endif
 955 #if defined(CONFIG_MMU)
 956         {
 957                 .procname       = "randomize_va_space",
 958                 .data           = &randomize_va_space,
 959                 .maxlen         = sizeof(int),
 960                 .mode           = 0644,
 961                 .proc_handler   = proc_dointvec,
 962         },
 963 #endif
 964 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
 965         {
 966                 .procname       = "spin_retry",
 967                 .data           = &spin_retry,
 968                 .maxlen         = sizeof (int),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_dointvec,
 971         },
 972 #endif
 973 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 974         {
 975                 .procname       = "acpi_video_flags",
 976                 .data           = &acpi_realmode_flags,
 977                 .maxlen         = sizeof (unsigned long),
 978                 .mode           = 0644,
 979                 .proc_handler   = proc_doulongvec_minmax,
 980         },
 981 #endif
 982 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 983         {
 984                 .procname       = "ignore-unaligned-usertrap",
 985                 .data           = &no_unaligned_warning,
 986                 .maxlen         = sizeof (int),
 987                 .mode           = 0644,
 988                 .proc_handler   = proc_dointvec,
 989         },
 990 #endif
 991 #ifdef CONFIG_IA64
 992         {
 993                 .procname       = "unaligned-dump-stack",
 994                 .data           = &unaligned_dump_stack,
 995                 .maxlen         = sizeof (int),
 996                 .mode           = 0644,
 997                 .proc_handler   = proc_dointvec,
 998         },
 999 #endif
1000 #ifdef CONFIG_DETECT_HUNG_TASK
1001         {
1002                 .procname       = "hung_task_panic",
1003                 .data           = &sysctl_hung_task_panic,
1004                 .maxlen         = sizeof(int),
1005                 .mode           = 0644,
1006                 .proc_handler   = proc_dointvec_minmax,
1007                 .extra1         = &zero,
1008                 .extra2         = &one,
1009         },
1010         {
1011                 .procname       = "hung_task_check_count",
1012                 .data           = &sysctl_hung_task_check_count,
1013                 .maxlen         = sizeof(int),
1014                 .mode           = 0644,
1015                 .proc_handler   = proc_dointvec_minmax,
1016                 .extra1         = &zero,
1017         },
1018         {
1019                 .procname       = "hung_task_timeout_secs",
1020                 .data           = &sysctl_hung_task_timeout_secs,
1021                 .maxlen         = sizeof(unsigned long),
1022                 .mode           = 0644,
1023                 .proc_handler   = proc_dohung_task_timeout_secs,
1024                 .extra2         = &hung_task_timeout_max,
1025         },
1026         {
1027                 .procname       = "hung_task_warnings",
1028                 .data           = &sysctl_hung_task_warnings,
1029                 .maxlen         = sizeof(int),
1030                 .mode           = 0644,
1031                 .proc_handler   = proc_dointvec_minmax,
1032                 .extra1         = &neg_one,
1033         },
1034 #endif
1035 #ifdef CONFIG_COMPAT
1036         {
1037                 .procname       = "compat-log",
1038                 .data           = &compat_log,
1039                 .maxlen         = sizeof (int),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_dointvec,
1042         },
1043 #endif
1044 #ifdef CONFIG_RT_MUTEXES
1045         {
1046                 .procname       = "max_lock_depth",
1047                 .data           = &max_lock_depth,
1048                 .maxlen         = sizeof(int),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_dointvec,
1051         },
1052 #endif
1053         {
1054                 .procname       = "poweroff_cmd",
1055                 .data           = &poweroff_cmd,
1056                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1057                 .mode           = 0644,
1058                 .proc_handler   = proc_dostring,
1059         },
1060 #ifdef CONFIG_KEYS
1061         {
1062                 .procname       = "keys",
1063                 .mode           = 0555,
1064                 .child          = key_sysctls,
1065         },
1066 #endif
1067 #ifdef CONFIG_PERF_EVENTS
1068         /*
1069          * User-space scripts rely on the existence of this file
1070          * as a feature check for perf_events being enabled.
1071          *
1072          * So it's an ABI, do not remove!
1073          */
1074         {
1075                 .procname       = "perf_event_paranoid",
1076                 .data           = &sysctl_perf_event_paranoid,
1077                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1078                 .mode           = 0644,
1079                 .proc_handler   = proc_dointvec,
1080         },
1081         {
1082                 .procname       = "perf_event_mlock_kb",
1083                 .data           = &sysctl_perf_event_mlock,
1084                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1085                 .mode           = 0644,
1086                 .proc_handler   = proc_dointvec,
1087         },
1088         {
1089                 .procname       = "perf_event_max_sample_rate",
1090                 .data           = &sysctl_perf_event_sample_rate,
1091                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1092                 .mode           = 0644,
1093                 .proc_handler   = perf_proc_update_handler,
1094                 .extra1         = &one,
1095         },
1096         {
1097                 .procname       = "perf_cpu_time_max_percent",
1098                 .data           = &sysctl_perf_cpu_time_max_percent,
1099                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1100                 .mode           = 0644,
1101                 .proc_handler   = perf_cpu_time_max_percent_handler,
1102                 .extra1         = &zero,
1103                 .extra2         = &one_hundred,
1104         },
1105 #endif
1106 #ifdef CONFIG_KMEMCHECK
1107         {
1108                 .procname       = "kmemcheck",
1109                 .data           = &kmemcheck_enabled,
1110                 .maxlen         = sizeof(int),
1111                 .mode           = 0644,
1112                 .proc_handler   = proc_dointvec,
1113         },
1114 #endif
1115         {
1116                 .procname       = "panic_on_warn",
1117                 .data           = &panic_on_warn,
1118                 .maxlen         = sizeof(int),
1119                 .mode           = 0644,
1120                 .proc_handler   = proc_dointvec_minmax,
1121                 .extra1         = &zero,
1122                 .extra2         = &one,
1123         },
1124         { }
1125 };
1126
1127 static struct ctl_table vm_table[] = {
1128         {
1129                 .procname       = "overcommit_memory",
1130                 .data           = &sysctl_overcommit_memory,
1131                 .maxlen         = sizeof(sysctl_overcommit_memory),
1132                 .mode           = 0644,
1133                 .proc_handler   = proc_dointvec_minmax,
1134                 .extra1         = &zero,
1135                 .extra2         = &two,
1136         },
1137         {
1138                 .procname       = "panic_on_oom",
1139                 .data           = &sysctl_panic_on_oom,
1140                 .maxlen         = sizeof(sysctl_panic_on_oom),
1141                 .mode           = 0644,
1142                 .proc_handler   = proc_dointvec_minmax,
1143                 .extra1         = &zero,
1144                 .extra2         = &two,
1145         },
1146         {
1147                 .procname       = "oom_kill_allocating_task",
1148                 .data           = &sysctl_oom_kill_allocating_task,
1149                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dointvec,
1152         },
1153         {
1154                 .procname       = "oom_dump_tasks",
1155                 .data           = &sysctl_oom_dump_tasks,
1156                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1157                 .mode           = 0644,
1158                 .proc_handler   = proc_dointvec,
1159         },
1160         {
1161                 .procname       = "overcommit_ratio",
1162                 .data           = &sysctl_overcommit_ratio,
1163                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1164                 .mode           = 0644,
1165                 .proc_handler   = overcommit_ratio_handler,
1166         },
1167         {
1168                 .procname       = "overcommit_kbytes",
1169                 .data           = &sysctl_overcommit_kbytes,
1170                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1171                 .mode           = 0644,
1172                 .proc_handler   = overcommit_kbytes_handler,
1173         },
1174         {
1175                 .procname       = "page-cluster",
1176                 .data           = &page_cluster,
1177                 .maxlen         = sizeof(int),
1178                 .mode           = 0644,
1179                 .proc_handler   = proc_dointvec_minmax,
1180                 .extra1         = &zero,
1181         },
1182         {
1183                 .procname       = "dirty_background_ratio",
1184                 .data           = &dirty_background_ratio,
1185                 .maxlen         = sizeof(dirty_background_ratio),
1186                 .mode           = 0644,
1187                 .proc_handler   = dirty_background_ratio_handler,
1188                 .extra1         = &zero,
1189                 .extra2         = &one_hundred,
1190         },
1191         {
1192                 .procname       = "dirty_background_bytes",
1193                 .data           = &dirty_background_bytes,
1194                 .maxlen         = sizeof(dirty_background_bytes),
1195                 .mode           = 0644,
1196                 .proc_handler   = dirty_background_bytes_handler,
1197                 .extra1         = &one_ul,
1198         },
1199         {
1200                 .procname       = "dirty_ratio",
1201                 .data           = &vm_dirty_ratio,
1202                 .maxlen         = sizeof(vm_dirty_ratio),
1203                 .mode           = 0644,
1204                 .proc_handler   = dirty_ratio_handler,
1205                 .extra1         = &zero,
1206                 .extra2         = &one_hundred,
1207         },
1208         {
1209                 .procname       = "dirty_bytes",
1210                 .data           = &vm_dirty_bytes,
1211                 .maxlen         = sizeof(vm_dirty_bytes),
1212                 .mode           = 0644,
1213                 .proc_handler   = dirty_bytes_handler,
1214                 .extra1         = &dirty_bytes_min,
1215         },
1216         {
1217                 .procname       = "dirty_writeback_centisecs",
1218                 .data           = &dirty_writeback_interval,
1219                 .maxlen         = sizeof(dirty_writeback_interval),
1220                 .mode           = 0644,
1221                 .proc_handler   = dirty_writeback_centisecs_handler,
1222         },
1223         {
1224                 .procname       = "dirty_expire_centisecs",
1225                 .data           = &dirty_expire_interval,
1226                 .maxlen         = sizeof(dirty_expire_interval),
1227                 .mode           = 0644,
1228                 .proc_handler   = proc_dointvec_minmax,
1229                 .extra1         = &zero,
1230         },
1231         {
1232                 .procname       = "dirtytime_expire_seconds",
1233                 .data           = &dirtytime_expire_interval,
1234                 .maxlen         = sizeof(dirty_expire_interval),
1235                 .mode           = 0644,
1236                 .proc_handler   = dirtytime_interval_handler,
1237                 .extra1         = &zero,
1238         },
1239         {
1240                 .procname       = "nr_pdflush_threads",
1241                 .mode           = 0444 /* read-only */,
1242                 .proc_handler   = pdflush_proc_obsolete,
1243         },
1244         {
1245                 .procname       = "swappiness",
1246                 .data           = &vm_swappiness,
1247                 .maxlen         = sizeof(vm_swappiness),
1248                 .mode           = 0644,
1249                 .proc_handler   = proc_dointvec_minmax,
1250                 .extra1         = &zero,
1251                 .extra2         = &one_hundred,
1252         },
1253 #ifdef CONFIG_HUGETLB_PAGE
1254         {
1255                 .procname       = "nr_hugepages",
1256                 .data           = NULL,
1257                 .maxlen         = sizeof(unsigned long),
1258                 .mode           = 0644,
1259                 .proc_handler   = hugetlb_sysctl_handler,
1260         },
1261 #ifdef CONFIG_NUMA
1262         {
1263                 .procname       = "nr_hugepages_mempolicy",
1264                 .data           = NULL,
1265                 .maxlen         = sizeof(unsigned long),
1266                 .mode           = 0644,
1267                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1268         },
1269 #endif
1270          {
1271                 .procname       = "hugetlb_shm_group",
1272                 .data           = &sysctl_hugetlb_shm_group,
1273                 .maxlen         = sizeof(gid_t),
1274                 .mode           = 0644,
1275                 .proc_handler   = proc_dointvec,
1276          },
1277          {
1278                 .procname       = "hugepages_treat_as_movable",
1279                 .data           = &hugepages_treat_as_movable,
1280                 .maxlen         = sizeof(int),
1281                 .mode           = 0644,
1282                 .proc_handler   = proc_dointvec,
1283         },
1284         {
1285                 .procname       = "nr_overcommit_hugepages",
1286                 .data           = NULL,
1287                 .maxlen         = sizeof(unsigned long),
1288                 .mode           = 0644,
1289                 .proc_handler   = hugetlb_overcommit_handler,
1290         },
1291 #endif
1292         {
1293                 .procname       = "lowmem_reserve_ratio",
1294                 .data           = &sysctl_lowmem_reserve_ratio,
1295                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1296                 .mode           = 0644,
1297                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1298         },
1299         {
1300                 .procname       = "drop_caches",
1301                 .data           = &sysctl_drop_caches,
1302                 .maxlen         = sizeof(int),
1303                 .mode           = 0644,
1304                 .proc_handler   = drop_caches_sysctl_handler,
1305                 .extra1         = &one,
1306                 .extra2         = &four,
1307         },
1308 #ifdef CONFIG_COMPACTION
1309         {
1310                 .procname       = "compact_memory",
1311                 .data           = &sysctl_compact_memory,
1312                 .maxlen         = sizeof(int),
1313                 .mode           = 0200,
1314                 .proc_handler   = sysctl_compaction_handler,
1315         },
1316         {
1317                 .procname       = "extfrag_threshold",
1318                 .data           = &sysctl_extfrag_threshold,
1319                 .maxlen         = sizeof(int),
1320                 .mode           = 0644,
1321                 .proc_handler   = sysctl_extfrag_handler,
1322                 .extra1         = &min_extfrag_threshold,
1323                 .extra2         = &max_extfrag_threshold,
1324         },
1325
1326 #endif /* CONFIG_COMPACTION */
1327         {
1328                 .procname       = "min_free_kbytes",
1329                 .data           = &min_free_kbytes,
1330                 .maxlen         = sizeof(min_free_kbytes),
1331                 .mode           = 0644,
1332                 .proc_handler   = min_free_kbytes_sysctl_handler,
1333                 .extra1         = &zero,
1334         },
1335         {
1336                 .procname       = "extra_free_kbytes",
1337                 .data           = &extra_free_kbytes,
1338                 .maxlen         = sizeof(extra_free_kbytes),
1339                 .mode           = 0644,
1340                 .proc_handler   = min_free_kbytes_sysctl_handler,
1341                 .extra1         = &zero,
1342         },
1343         {
1344                 .procname       = "percpu_pagelist_fraction",
1345                 .data           = &percpu_pagelist_fraction,
1346                 .maxlen         = sizeof(percpu_pagelist_fraction),
1347                 .mode           = 0644,
1348                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1349                 .extra1         = &zero,
1350         },
1351 #ifdef CONFIG_MMU
1352         {
1353                 .procname       = "max_map_count",
1354                 .data           = &sysctl_max_map_count,
1355                 .maxlen         = sizeof(sysctl_max_map_count),
1356                 .mode           = 0644,
1357                 .proc_handler   = proc_dointvec_minmax,
1358                 .extra1         = &zero,
1359         },
1360 #else
1361         {
1362                 .procname       = "nr_trim_pages",
1363                 .data           = &sysctl_nr_trim_pages,
1364                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1365                 .mode           = 0644,
1366                 .proc_handler   = proc_dointvec_minmax,
1367                 .extra1         = &zero,
1368         },
1369 #endif
1370         {
1371                 .procname       = "laptop_mode",
1372                 .data           = &laptop_mode,
1373                 .maxlen         = sizeof(laptop_mode),
1374                 .mode           = 0644,
1375                 .proc_handler   = proc_dointvec_jiffies,
1376         },
1377         {
1378                 .procname       = "block_dump",
1379                 .data           = &block_dump,
1380                 .maxlen         = sizeof(block_dump),
1381                 .mode           = 0644,
1382                 .proc_handler   = proc_dointvec,
1383                 .extra1         = &zero,
1384         },
1385         {
1386                 .procname       = "vfs_cache_pressure",
1387                 .data           = &sysctl_vfs_cache_pressure,
1388                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1389                 .mode           = 0644,
1390                 .proc_handler   = proc_dointvec,
1391                 .extra1         = &zero,
1392         },
1393 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1394         {
1395                 .procname       = "legacy_va_layout",
1396                 .data           = &sysctl_legacy_va_layout,
1397                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1398                 .mode           = 0644,
1399                 .proc_handler   = proc_dointvec,
1400                 .extra1         = &zero,
1401         },
1402 #endif
1403 #ifdef CONFIG_NUMA
1404         {
1405                 .procname       = "zone_reclaim_mode",
1406                 .data           = &zone_reclaim_mode,
1407                 .maxlen         = sizeof(zone_reclaim_mode),
1408                 .mode           = 0644,
1409                 .proc_handler   = proc_dointvec,
1410                 .extra1         = &zero,
1411         },
1412         {
1413                 .procname       = "min_unmapped_ratio",
1414                 .data           = &sysctl_min_unmapped_ratio,
1415                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1416                 .mode           = 0644,
1417                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1418                 .extra1         = &zero,
1419                 .extra2         = &one_hundred,
1420         },
1421         {
1422                 .procname       = "min_slab_ratio",
1423                 .data           = &sysctl_min_slab_ratio,
1424                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1425                 .mode           = 0644,
1426                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1427                 .extra1         = &zero,
1428                 .extra2         = &one_hundred,
1429         },
1430 #endif
1431 #ifdef CONFIG_SMP
1432         {
1433                 .procname       = "stat_interval",
1434                 .data           = &sysctl_stat_interval,
1435                 .maxlen         = sizeof(sysctl_stat_interval),
1436                 .mode           = 0644,
1437                 .proc_handler   = proc_dointvec_jiffies,
1438         },
1439 #endif
1440 #ifdef CONFIG_MMU
1441         {
1442                 .procname       = "mmap_min_addr",
1443                 .data           = &dac_mmap_min_addr,
1444                 .maxlen         = sizeof(unsigned long),
1445                 .mode           = 0644,
1446                 .proc_handler   = mmap_min_addr_handler,
1447         },
1448 #endif
1449 #ifdef CONFIG_NUMA
1450         {
1451                 .procname       = "numa_zonelist_order",
1452                 .data           = &numa_zonelist_order,
1453                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1454                 .mode           = 0644,
1455                 .proc_handler   = numa_zonelist_order_handler,
1456         },
1457 #endif
1458 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1459    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1460         {
1461                 .procname       = "vdso_enabled",
1462 #ifdef CONFIG_X86_32
1463                 .data           = &vdso32_enabled,
1464                 .maxlen         = sizeof(vdso32_enabled),
1465 #else
1466                 .data           = &vdso_enabled,
1467                 .maxlen         = sizeof(vdso_enabled),
1468 #endif
1469                 .mode           = 0644,
1470                 .proc_handler   = proc_dointvec,
1471                 .extra1         = &zero,
1472         },
1473 #endif
1474 #ifdef CONFIG_HIGHMEM
1475         {
1476                 .procname       = "highmem_is_dirtyable",
1477                 .data           = &vm_highmem_is_dirtyable,
1478                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1479                 .mode           = 0644,
1480                 .proc_handler   = proc_dointvec_minmax,
1481                 .extra1         = &zero,
1482                 .extra2         = &one,
1483         },
1484 #endif
1485 #ifdef CONFIG_MEMORY_FAILURE
1486         {
1487                 .procname       = "memory_failure_early_kill",
1488                 .data           = &sysctl_memory_failure_early_kill,
1489                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1490                 .mode           = 0644,
1491                 .proc_handler   = proc_dointvec_minmax,
1492                 .extra1         = &zero,
1493                 .extra2         = &one,
1494         },
1495         {
1496                 .procname       = "memory_failure_recovery",
1497                 .data           = &sysctl_memory_failure_recovery,
1498                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1499                 .mode           = 0644,
1500                 .proc_handler   = proc_dointvec_minmax,
1501                 .extra1         = &zero,
1502                 .extra2         = &one,
1503         },
1504 #endif
1505         {
1506                 .procname       = "user_reserve_kbytes",
1507                 .data           = &sysctl_user_reserve_kbytes,
1508                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1509                 .mode           = 0644,
1510                 .proc_handler   = proc_doulongvec_minmax,
1511         },
1512         {
1513                 .procname       = "admin_reserve_kbytes",
1514                 .data           = &sysctl_admin_reserve_kbytes,
1515                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1516                 .mode           = 0644,
1517                 .proc_handler   = proc_doulongvec_minmax,
1518         },
1519         { }
1520 };
1521
1522 static struct ctl_table fs_table[] = {
1523         {
1524                 .procname       = "inode-nr",
1525                 .data           = &inodes_stat,
1526                 .maxlen         = 2*sizeof(long),
1527                 .mode           = 0444,
1528                 .proc_handler   = proc_nr_inodes,
1529         },
1530         {
1531                 .procname       = "inode-state",
1532                 .data           = &inodes_stat,
1533                 .maxlen         = 7*sizeof(long),
1534                 .mode           = 0444,
1535                 .proc_handler   = proc_nr_inodes,
1536         },
1537         {
1538                 .procname       = "file-nr",
1539                 .data           = &files_stat,
1540                 .maxlen         = sizeof(files_stat),
1541                 .mode           = 0444,
1542                 .proc_handler   = proc_nr_files,
1543         },
1544         {
1545                 .procname       = "file-max",
1546                 .data           = &files_stat.max_files,
1547                 .maxlen         = sizeof(files_stat.max_files),
1548                 .mode           = 0644,
1549                 .proc_handler   = proc_doulongvec_minmax,
1550         },
1551         {
1552                 .procname       = "nr_open",
1553                 .data           = &sysctl_nr_open,
1554                 .maxlen         = sizeof(int),
1555                 .mode           = 0644,
1556                 .proc_handler   = proc_dointvec_minmax,
1557                 .extra1         = &sysctl_nr_open_min,
1558                 .extra2         = &sysctl_nr_open_max,
1559         },
1560         {
1561                 .procname       = "dentry-state",
1562                 .data           = &dentry_stat,
1563                 .maxlen         = 6*sizeof(long),
1564                 .mode           = 0444,
1565                 .proc_handler   = proc_nr_dentry,
1566         },
1567         {
1568                 .procname       = "overflowuid",
1569                 .data           = &fs_overflowuid,
1570                 .maxlen         = sizeof(int),
1571                 .mode           = 0644,
1572                 .proc_handler   = proc_dointvec_minmax,
1573                 .extra1         = &minolduid,
1574                 .extra2         = &maxolduid,
1575         },
1576         {
1577                 .procname       = "overflowgid",
1578                 .data           = &fs_overflowgid,
1579                 .maxlen         = sizeof(int),
1580                 .mode           = 0644,
1581                 .proc_handler   = proc_dointvec_minmax,
1582                 .extra1         = &minolduid,
1583                 .extra2         = &maxolduid,
1584         },
1585 #ifdef CONFIG_FILE_LOCKING
1586         {
1587                 .procname       = "leases-enable",
1588                 .data           = &leases_enable,
1589                 .maxlen         = sizeof(int),
1590                 .mode           = 0644,
1591                 .proc_handler   = proc_dointvec,
1592         },
1593 #endif
1594 #ifdef CONFIG_DNOTIFY
1595         {
1596                 .procname       = "dir-notify-enable",
1597                 .data           = &dir_notify_enable,
1598                 .maxlen         = sizeof(int),
1599                 .mode           = 0644,
1600                 .proc_handler   = proc_dointvec,
1601         },
1602 #endif
1603 #ifdef CONFIG_MMU
1604 #ifdef CONFIG_FILE_LOCKING
1605         {
1606                 .procname       = "lease-break-time",
1607                 .data           = &lease_break_time,
1608                 .maxlen         = sizeof(int),
1609                 .mode           = 0644,
1610                 .proc_handler   = proc_dointvec,
1611         },
1612 #endif
1613 #ifdef CONFIG_AIO
1614         {
1615                 .procname       = "aio-nr",
1616                 .data           = &aio_nr,
1617                 .maxlen         = sizeof(aio_nr),
1618                 .mode           = 0444,
1619                 .proc_handler   = proc_doulongvec_minmax,
1620         },
1621         {
1622                 .procname       = "aio-max-nr",
1623                 .data           = &aio_max_nr,
1624                 .maxlen         = sizeof(aio_max_nr),
1625                 .mode           = 0644,
1626                 .proc_handler   = proc_doulongvec_minmax,
1627         },
1628 #endif /* CONFIG_AIO */
1629 #ifdef CONFIG_INOTIFY_USER
1630         {
1631                 .procname       = "inotify",
1632                 .mode           = 0555,
1633                 .child          = inotify_table,
1634         },
1635 #endif
1636 #ifdef CONFIG_EPOLL
1637         {
1638                 .procname       = "epoll",
1639                 .mode           = 0555,
1640                 .child          = epoll_table,
1641         },
1642 #endif
1643 #endif
1644         {
1645                 .procname       = "protected_symlinks",
1646                 .data           = &sysctl_protected_symlinks,
1647                 .maxlen         = sizeof(int),
1648                 .mode           = 0600,
1649                 .proc_handler   = proc_dointvec_minmax,
1650                 .extra1         = &zero,
1651                 .extra2         = &one,
1652         },
1653         {
1654                 .procname       = "protected_hardlinks",
1655                 .data           = &sysctl_protected_hardlinks,
1656                 .maxlen         = sizeof(int),
1657                 .mode           = 0600,
1658                 .proc_handler   = proc_dointvec_minmax,
1659                 .extra1         = &zero,
1660                 .extra2         = &one,
1661         },
1662         {
1663                 .procname       = "suid_dumpable",
1664                 .data           = &suid_dumpable,
1665                 .maxlen         = sizeof(int),
1666                 .mode           = 0644,
1667                 .proc_handler   = proc_dointvec_minmax_coredump,
1668                 .extra1         = &zero,
1669                 .extra2         = &two,
1670         },
1671 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1672         {
1673                 .procname       = "binfmt_misc",
1674                 .mode           = 0555,
1675                 .child          = sysctl_mount_point,
1676         },
1677 #endif
1678         {
1679                 .procname       = "pipe-max-size",
1680                 .data           = &pipe_max_size,
1681                 .maxlen         = sizeof(int),
1682                 .mode           = 0644,
1683                 .proc_handler   = &pipe_proc_fn,
1684                 .extra1         = &pipe_min_size,
1685         },
1686         { }
1687 };
1688
1689 static struct ctl_table debug_table[] = {
1690 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1691         {
1692                 .procname       = "exception-trace",
1693                 .data           = &show_unhandled_signals,
1694                 .maxlen         = sizeof(int),
1695                 .mode           = 0644,
1696                 .proc_handler   = proc_dointvec
1697         },
1698 #endif
1699 #if defined(CONFIG_OPTPROBES)
1700         {
1701                 .procname       = "kprobes-optimization",
1702                 .data           = &sysctl_kprobes_optimization,
1703                 .maxlen         = sizeof(int),
1704                 .mode           = 0644,
1705                 .proc_handler   = proc_kprobes_optimization_handler,
1706                 .extra1         = &zero,
1707                 .extra2         = &one,
1708         },
1709 #endif
1710         { }
1711 };
1712
1713 static struct ctl_table dev_table[] = {
1714         { }
1715 };
1716
1717 int __init sysctl_init(void)
1718 {
1719         struct ctl_table_header *hdr;
1720
1721         hdr = register_sysctl_table(sysctl_base_table);
1722         kmemleak_not_leak(hdr);
1723         return 0;
1724 }
1725
1726 #endif /* CONFIG_SYSCTL */
1727
1728 /*
1729  * /proc/sys support
1730  */
1731
1732 #ifdef CONFIG_PROC_SYSCTL
1733
1734 static int _proc_do_string(char *data, int maxlen, int write,
1735                            char __user *buffer,
1736                            size_t *lenp, loff_t *ppos)
1737 {
1738         size_t len;
1739         char __user *p;
1740         char c;
1741
1742         if (!data || !maxlen || !*lenp) {
1743                 *lenp = 0;
1744                 return 0;
1745         }
1746
1747         if (write) {
1748                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1749                         /* Only continue writes not past the end of buffer. */
1750                         len = strlen(data);
1751                         if (len > maxlen - 1)
1752                                 len = maxlen - 1;
1753
1754                         if (*ppos > len)
1755                                 return 0;
1756                         len = *ppos;
1757                 } else {
1758                         /* Start writing from beginning of buffer. */
1759                         len = 0;
1760                 }
1761
1762                 *ppos += *lenp;
1763                 p = buffer;
1764                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1765                         if (get_user(c, p++))
1766                                 return -EFAULT;
1767                         if (c == 0 || c == '\n')
1768                                 break;
1769                         data[len++] = c;
1770                 }
1771                 data[len] = 0;
1772         } else {
1773                 len = strlen(data);
1774                 if (len > maxlen)
1775                         len = maxlen;
1776
1777                 if (*ppos > len) {
1778                         *lenp = 0;
1779                         return 0;
1780                 }
1781
1782                 data += *ppos;
1783                 len  -= *ppos;
1784
1785                 if (len > *lenp)
1786                         len = *lenp;
1787                 if (len)
1788                         if (copy_to_user(buffer, data, len))
1789                                 return -EFAULT;
1790                 if (len < *lenp) {
1791                         if (put_user('\n', buffer + len))
1792                                 return -EFAULT;
1793                         len++;
1794                 }
1795                 *lenp = len;
1796                 *ppos += len;
1797         }
1798         return 0;
1799 }
1800
1801 static void warn_sysctl_write(struct ctl_table *table)
1802 {
1803         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1804                 "This will not be supported in the future. To silence this\n"
1805                 "warning, set kernel.sysctl_writes_strict = -1\n",
1806                 current->comm, table->procname);
1807 }
1808
1809 /**
1810  * proc_dostring - read a string sysctl
1811  * @table: the sysctl table
1812  * @write: %TRUE if this is a write to the sysctl file
1813  * @buffer: the user buffer
1814  * @lenp: the size of the user buffer
1815  * @ppos: file position
1816  *
1817  * Reads/writes a string from/to the user buffer. If the kernel
1818  * buffer provided is not large enough to hold the string, the
1819  * string is truncated. The copied string is %NULL-terminated.
1820  * If the string is being read by the user process, it is copied
1821  * and a newline '\n' is added. It is truncated if the buffer is
1822  * not large enough.
1823  *
1824  * Returns 0 on success.
1825  */
1826 int proc_dostring(struct ctl_table *table, int write,
1827                   void __user *buffer, size_t *lenp, loff_t *ppos)
1828 {
1829         if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1830                 warn_sysctl_write(table);
1831
1832         return _proc_do_string((char *)(table->data), table->maxlen, write,
1833                                (char __user *)buffer, lenp, ppos);
1834 }
1835
1836 static size_t proc_skip_spaces(char **buf)
1837 {
1838         size_t ret;
1839         char *tmp = skip_spaces(*buf);
1840         ret = tmp - *buf;
1841         *buf = tmp;
1842         return ret;
1843 }
1844
1845 static void proc_skip_char(char **buf, size_t *size, const char v)
1846 {
1847         while (*size) {
1848                 if (**buf != v)
1849                         break;
1850                 (*size)--;
1851                 (*buf)++;
1852         }
1853 }
1854
1855 #define TMPBUFLEN 22
1856 /**
1857  * proc_get_long - reads an ASCII formatted integer from a user buffer
1858  *
1859  * @buf: a kernel buffer
1860  * @size: size of the kernel buffer
1861  * @val: this is where the number will be stored
1862  * @neg: set to %TRUE if number is negative
1863  * @perm_tr: a vector which contains the allowed trailers
1864  * @perm_tr_len: size of the perm_tr vector
1865  * @tr: pointer to store the trailer character
1866  *
1867  * In case of success %0 is returned and @buf and @size are updated with
1868  * the amount of bytes read. If @tr is non-NULL and a trailing
1869  * character exists (size is non-zero after returning from this
1870  * function), @tr is updated with the trailing character.
1871  */
1872 static int proc_get_long(char **buf, size_t *size,
1873                           unsigned long *val, bool *neg,
1874                           const char *perm_tr, unsigned perm_tr_len, char *tr)
1875 {
1876         int len;
1877         char *p, tmp[TMPBUFLEN];
1878
1879         if (!*size)
1880                 return -EINVAL;
1881
1882         len = *size;
1883         if (len > TMPBUFLEN - 1)
1884                 len = TMPBUFLEN - 1;
1885
1886         memcpy(tmp, *buf, len);
1887
1888         tmp[len] = 0;
1889         p = tmp;
1890         if (*p == '-' && *size > 1) {
1891                 *neg = true;
1892                 p++;
1893         } else
1894                 *neg = false;
1895         if (!isdigit(*p))
1896                 return -EINVAL;
1897
1898         *val = simple_strtoul(p, &p, 0);
1899
1900         len = p - tmp;
1901
1902         /* We don't know if the next char is whitespace thus we may accept
1903          * invalid integers (e.g. 1234...a) or two integers instead of one
1904          * (e.g. 123...1). So lets not allow such large numbers. */
1905         if (len == TMPBUFLEN - 1)
1906                 return -EINVAL;
1907
1908         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1909                 return -EINVAL;
1910
1911         if (tr && (len < *size))
1912                 *tr = *p;
1913
1914         *buf += len;
1915         *size -= len;
1916
1917         return 0;
1918 }
1919
1920 /**
1921  * proc_put_long - converts an integer to a decimal ASCII formatted string
1922  *
1923  * @buf: the user buffer
1924  * @size: the size of the user buffer
1925  * @val: the integer to be converted
1926  * @neg: sign of the number, %TRUE for negative
1927  *
1928  * In case of success %0 is returned and @buf and @size are updated with
1929  * the amount of bytes written.
1930  */
1931 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1932                           bool neg)
1933 {
1934         int len;
1935         char tmp[TMPBUFLEN], *p = tmp;
1936
1937         sprintf(p, "%s%lu", neg ? "-" : "", val);
1938         len = strlen(tmp);
1939         if (len > *size)
1940                 len = *size;
1941         if (copy_to_user(*buf, tmp, len))
1942                 return -EFAULT;
1943         *size -= len;
1944         *buf += len;
1945         return 0;
1946 }
1947 #undef TMPBUFLEN
1948
1949 static int proc_put_char(void __user **buf, size_t *size, char c)
1950 {
1951         if (*size) {
1952                 char __user **buffer = (char __user **)buf;
1953                 if (put_user(c, *buffer))
1954                         return -EFAULT;
1955                 (*size)--, (*buffer)++;
1956                 *buf = *buffer;
1957         }
1958         return 0;
1959 }
1960
1961 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1962                                  int *valp,
1963                                  int write, void *data)
1964 {
1965         if (write) {
1966                 *valp = *negp ? -*lvalp : *lvalp;
1967         } else {
1968                 int val = *valp;
1969                 if (val < 0) {
1970                         *negp = true;
1971                         *lvalp = (unsigned long)-val;
1972                 } else {
1973                         *negp = false;
1974                         *lvalp = (unsigned long)val;
1975                 }
1976         }
1977         return 0;
1978 }
1979
1980 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1981
1982 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1983                   int write, void __user *buffer,
1984                   size_t *lenp, loff_t *ppos,
1985                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1986                               int write, void *data),
1987                   void *data)
1988 {
1989         int *i, vleft, first = 1, err = 0;
1990         unsigned long page = 0;
1991         size_t left;
1992         char *kbuf;
1993
1994         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1995                 *lenp = 0;
1996                 return 0;
1997         }
1998
1999         i = (int *) tbl_data;
2000         vleft = table->maxlen / sizeof(*i);
2001         left = *lenp;
2002
2003         if (!conv)
2004                 conv = do_proc_dointvec_conv;
2005
2006         if (write) {
2007                 if (*ppos) {
2008                         switch (sysctl_writes_strict) {
2009                         case SYSCTL_WRITES_STRICT:
2010                                 goto out;
2011                         case SYSCTL_WRITES_WARN:
2012                                 warn_sysctl_write(table);
2013                                 break;
2014                         default:
2015                                 break;
2016                         }
2017                 }
2018
2019                 if (left > PAGE_SIZE - 1)
2020                         left = PAGE_SIZE - 1;
2021                 page = __get_free_page(GFP_TEMPORARY);
2022                 kbuf = (char *) page;
2023                 if (!kbuf)
2024                         return -ENOMEM;
2025                 if (copy_from_user(kbuf, buffer, left)) {
2026                         err = -EFAULT;
2027                         goto free;
2028                 }
2029                 kbuf[left] = 0;
2030         }
2031
2032         for (; left && vleft--; i++, first=0) {
2033                 unsigned long lval;
2034                 bool neg;
2035
2036                 if (write) {
2037                         left -= proc_skip_spaces(&kbuf);
2038
2039                         if (!left)
2040                                 break;
2041                         err = proc_get_long(&kbuf, &left, &lval, &neg,
2042                                              proc_wspace_sep,
2043                                              sizeof(proc_wspace_sep), NULL);
2044                         if (err)
2045                                 break;
2046                         if (conv(&neg, &lval, i, 1, data)) {
2047                                 err = -EINVAL;
2048                                 break;
2049                         }
2050                 } else {
2051                         if (conv(&neg, &lval, i, 0, data)) {
2052                                 err = -EINVAL;
2053                                 break;
2054                         }
2055                         if (!first)
2056                                 err = proc_put_char(&buffer, &left, '\t');
2057                         if (err)
2058                                 break;
2059                         err = proc_put_long(&buffer, &left, lval, neg);
2060                         if (err)
2061                                 break;
2062                 }
2063         }
2064
2065         if (!write && !first && left && !err)
2066                 err = proc_put_char(&buffer, &left, '\n');
2067         if (write && !err && left)
2068                 left -= proc_skip_spaces(&kbuf);
2069 free:
2070         if (write) {
2071                 free_page(page);
2072                 if (first)
2073                         return err ? : -EINVAL;
2074         }
2075         *lenp -= left;
2076 out:
2077         *ppos += *lenp;
2078         return err;
2079 }
2080
2081 static int do_proc_dointvec(struct ctl_table *table, int write,
2082                   void __user *buffer, size_t *lenp, loff_t *ppos,
2083                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2084                               int write, void *data),
2085                   void *data)
2086 {
2087         return __do_proc_dointvec(table->data, table, write,
2088                         buffer, lenp, ppos, conv, data);
2089 }
2090
2091 /**
2092  * proc_dointvec - read a vector of integers
2093  * @table: the sysctl table
2094  * @write: %TRUE if this is a write to the sysctl file
2095  * @buffer: the user buffer
2096  * @lenp: the size of the user buffer
2097  * @ppos: file position
2098  *
2099  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2100  * values from/to the user buffer, treated as an ASCII string.
2101  *
2102  * Returns 0 on success.
2103  */
2104 int proc_dointvec(struct ctl_table *table, int write,
2105                      void __user *buffer, size_t *lenp, loff_t *ppos)
2106 {
2107     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2108                             NULL,NULL);
2109 }
2110
2111 /*
2112  * Taint values can only be increased
2113  * This means we can safely use a temporary.
2114  */
2115 static int proc_taint(struct ctl_table *table, int write,
2116                                void __user *buffer, size_t *lenp, loff_t *ppos)
2117 {
2118         struct ctl_table t;
2119         unsigned long tmptaint = get_taint();
2120         int err;
2121
2122         if (write && !capable(CAP_SYS_ADMIN))
2123                 return -EPERM;
2124
2125         t = *table;
2126         t.data = &tmptaint;
2127         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2128         if (err < 0)
2129                 return err;
2130
2131         if (write) {
2132                 /*
2133                  * Poor man's atomic or. Not worth adding a primitive
2134                  * to everyone's atomic.h for this
2135                  */
2136                 int i;
2137                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2138                         if ((tmptaint >> i) & 1)
2139                                 add_taint(i, LOCKDEP_STILL_OK);
2140                 }
2141         }
2142
2143         return err;
2144 }
2145
2146 #ifdef CONFIG_PRINTK
2147 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2148                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2149 {
2150         if (write && !capable(CAP_SYS_ADMIN))
2151                 return -EPERM;
2152
2153         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2154 }
2155 #endif
2156
2157 struct do_proc_dointvec_minmax_conv_param {
2158         int *min;
2159         int *max;
2160 };
2161
2162 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2163                                         int *valp,
2164                                         int write, void *data)
2165 {
2166         struct do_proc_dointvec_minmax_conv_param *param = data;
2167         if (write) {
2168                 int val = *negp ? -*lvalp : *lvalp;
2169                 if ((param->min && *param->min > val) ||
2170                     (param->max && *param->max < val))
2171                         return -EINVAL;
2172                 *valp = val;
2173         } else {
2174                 int val = *valp;
2175                 if (val < 0) {
2176                         *negp = true;
2177                         *lvalp = (unsigned long)-val;
2178                 } else {
2179                         *negp = false;
2180                         *lvalp = (unsigned long)val;
2181                 }
2182         }
2183         return 0;
2184 }
2185
2186 /**
2187  * proc_dointvec_minmax - read a vector of integers with min/max values
2188  * @table: the sysctl table
2189  * @write: %TRUE if this is a write to the sysctl file
2190  * @buffer: the user buffer
2191  * @lenp: the size of the user buffer
2192  * @ppos: file position
2193  *
2194  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2195  * values from/to the user buffer, treated as an ASCII string.
2196  *
2197  * This routine will ensure the values are within the range specified by
2198  * table->extra1 (min) and table->extra2 (max).
2199  *
2200  * Returns 0 on success.
2201  */
2202 int proc_dointvec_minmax(struct ctl_table *table, int write,
2203                   void __user *buffer, size_t *lenp, loff_t *ppos)
2204 {
2205         struct do_proc_dointvec_minmax_conv_param param = {
2206                 .min = (int *) table->extra1,
2207                 .max = (int *) table->extra2,
2208         };
2209         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2210                                 do_proc_dointvec_minmax_conv, &param);
2211 }
2212
2213 static void validate_coredump_safety(void)
2214 {
2215 #ifdef CONFIG_COREDUMP
2216         if (suid_dumpable == SUID_DUMP_ROOT &&
2217             core_pattern[0] != '/' && core_pattern[0] != '|') {
2218                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2219                         "suid_dumpable=2. Pipe handler or fully qualified "\
2220                         "core dump path required.\n");
2221         }
2222 #endif
2223 }
2224
2225 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2226                 void __user *buffer, size_t *lenp, loff_t *ppos)
2227 {
2228         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2229         if (!error)
2230                 validate_coredump_safety();
2231         return error;
2232 }
2233
2234 #ifdef CONFIG_COREDUMP
2235 static int proc_dostring_coredump(struct ctl_table *table, int write,
2236                   void __user *buffer, size_t *lenp, loff_t *ppos)
2237 {
2238         int error = proc_dostring(table, write, buffer, lenp, ppos);
2239         if (!error)
2240                 validate_coredump_safety();
2241         return error;
2242 }
2243 #endif
2244
2245 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2246                                      void __user *buffer,
2247                                      size_t *lenp, loff_t *ppos,
2248                                      unsigned long convmul,
2249                                      unsigned long convdiv)
2250 {
2251         unsigned long *i, *min, *max;
2252         int vleft, first = 1, err = 0;
2253         unsigned long page = 0;
2254         size_t left;
2255         char *kbuf;
2256
2257         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2258                 *lenp = 0;
2259                 return 0;
2260         }
2261
2262         i = (unsigned long *) data;
2263         min = (unsigned long *) table->extra1;
2264         max = (unsigned long *) table->extra2;
2265         vleft = table->maxlen / sizeof(unsigned long);
2266         left = *lenp;
2267
2268         if (write) {
2269                 if (*ppos) {
2270                         switch (sysctl_writes_strict) {
2271                         case SYSCTL_WRITES_STRICT:
2272                                 goto out;
2273                         case SYSCTL_WRITES_WARN:
2274                                 warn_sysctl_write(table);
2275                                 break;
2276                         default:
2277                                 break;
2278                         }
2279                 }
2280
2281                 if (left > PAGE_SIZE - 1)
2282                         left = PAGE_SIZE - 1;
2283                 page = __get_free_page(GFP_TEMPORARY);
2284                 kbuf = (char *) page;
2285                 if (!kbuf)
2286                         return -ENOMEM;
2287                 if (copy_from_user(kbuf, buffer, left)) {
2288                         err = -EFAULT;
2289                         goto free;
2290                 }
2291                 kbuf[left] = 0;
2292         }
2293
2294         for (; left && vleft--; i++, first = 0) {
2295                 unsigned long val;
2296
2297                 if (write) {
2298                         bool neg;
2299
2300                         left -= proc_skip_spaces(&kbuf);
2301
2302                         err = proc_get_long(&kbuf, &left, &val, &neg,
2303                                              proc_wspace_sep,
2304                                              sizeof(proc_wspace_sep), NULL);
2305                         if (err)
2306                                 break;
2307                         if (neg)
2308                                 continue;
2309                         if ((min && val < *min) || (max && val > *max))
2310                                 continue;
2311                         *i = val;
2312                 } else {
2313                         val = convdiv * (*i) / convmul;
2314                         if (!first) {
2315                                 err = proc_put_char(&buffer, &left, '\t');
2316                                 if (err)
2317                                         break;
2318                         }
2319                         err = proc_put_long(&buffer, &left, val, false);
2320                         if (err)
2321                                 break;
2322                 }
2323         }
2324
2325         if (!write && !first && left && !err)
2326                 err = proc_put_char(&buffer, &left, '\n');
2327         if (write && !err)
2328                 left -= proc_skip_spaces(&kbuf);
2329 free:
2330         if (write) {
2331                 free_page(page);
2332                 if (first)
2333                         return err ? : -EINVAL;
2334         }
2335         *lenp -= left;
2336 out:
2337         *ppos += *lenp;
2338         return err;
2339 }
2340
2341 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2342                                      void __user *buffer,
2343                                      size_t *lenp, loff_t *ppos,
2344                                      unsigned long convmul,
2345                                      unsigned long convdiv)
2346 {
2347         return __do_proc_doulongvec_minmax(table->data, table, write,
2348                         buffer, lenp, ppos, convmul, convdiv);
2349 }
2350
2351 /**
2352  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2353  * @table: the sysctl table
2354  * @write: %TRUE if this is a write to the sysctl file
2355  * @buffer: the user buffer
2356  * @lenp: the size of the user buffer
2357  * @ppos: file position
2358  *
2359  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2360  * values from/to the user buffer, treated as an ASCII string.
2361  *
2362  * This routine will ensure the values are within the range specified by
2363  * table->extra1 (min) and table->extra2 (max).
2364  *
2365  * Returns 0 on success.
2366  */
2367 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2368                            void __user *buffer, size_t *lenp, loff_t *ppos)
2369 {
2370     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2371 }
2372
2373 /**
2374  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2375  * @table: the sysctl table
2376  * @write: %TRUE if this is a write to the sysctl file
2377  * @buffer: the user buffer
2378  * @lenp: the size of the user buffer
2379  * @ppos: file position
2380  *
2381  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2382  * values from/to the user buffer, treated as an ASCII string. The values
2383  * are treated as milliseconds, and converted to jiffies when they are stored.
2384  *
2385  * This routine will ensure the values are within the range specified by
2386  * table->extra1 (min) and table->extra2 (max).
2387  *
2388  * Returns 0 on success.
2389  */
2390 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2391                                       void __user *buffer,
2392                                       size_t *lenp, loff_t *ppos)
2393 {
2394     return do_proc_doulongvec_minmax(table, write, buffer,
2395                                      lenp, ppos, HZ, 1000l);
2396 }
2397
2398
2399 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2400                                          int *valp,
2401                                          int write, void *data)
2402 {
2403         if (write) {
2404                 if (*lvalp > LONG_MAX / HZ)
2405                         return 1;
2406                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2407         } else {
2408                 int val = *valp;
2409                 unsigned long lval;
2410                 if (val < 0) {
2411                         *negp = true;
2412                         lval = (unsigned long)-val;
2413                 } else {
2414                         *negp = false;
2415                         lval = (unsigned long)val;
2416                 }
2417                 *lvalp = lval / HZ;
2418         }
2419         return 0;
2420 }
2421
2422 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2423                                                 int *valp,
2424                                                 int write, void *data)
2425 {
2426         if (write) {
2427                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2428                         return 1;
2429                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2430         } else {
2431                 int val = *valp;
2432                 unsigned long lval;
2433                 if (val < 0) {
2434                         *negp = true;
2435                         lval = (unsigned long)-val;
2436                 } else {
2437                         *negp = false;
2438                         lval = (unsigned long)val;
2439                 }
2440                 *lvalp = jiffies_to_clock_t(lval);
2441         }
2442         return 0;
2443 }
2444
2445 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2446                                             int *valp,
2447                                             int write, void *data)
2448 {
2449         if (write) {
2450                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2451
2452                 if (jif > INT_MAX)
2453                         return 1;
2454                 *valp = (int)jif;
2455         } else {
2456                 int val = *valp;
2457                 unsigned long lval;
2458                 if (val < 0) {
2459                         *negp = true;
2460                         lval = (unsigned long)-val;
2461                 } else {
2462                         *negp = false;
2463                         lval = (unsigned long)val;
2464                 }
2465                 *lvalp = jiffies_to_msecs(lval);
2466         }
2467         return 0;
2468 }
2469
2470 /**
2471  * proc_dointvec_jiffies - read a vector of integers as seconds
2472  * @table: the sysctl table
2473  * @write: %TRUE if this is a write to the sysctl file
2474  * @buffer: the user buffer
2475  * @lenp: the size of the user buffer
2476  * @ppos: file position
2477  *
2478  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2479  * values from/to the user buffer, treated as an ASCII string.
2480  * The values read are assumed to be in seconds, and are converted into
2481  * jiffies.
2482  *
2483  * Returns 0 on success.
2484  */
2485 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2486                           void __user *buffer, size_t *lenp, loff_t *ppos)
2487 {
2488     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2489                             do_proc_dointvec_jiffies_conv,NULL);
2490 }
2491
2492 /**
2493  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2494  * @table: the sysctl table
2495  * @write: %TRUE if this is a write to the sysctl file
2496  * @buffer: the user buffer
2497  * @lenp: the size of the user buffer
2498  * @ppos: pointer to the file position
2499  *
2500  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2501  * values from/to the user buffer, treated as an ASCII string.
2502  * The values read are assumed to be in 1/USER_HZ seconds, and
2503  * are converted into jiffies.
2504  *
2505  * Returns 0 on success.
2506  */
2507 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2508                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2509 {
2510     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2511                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2512 }
2513
2514 /**
2515  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2516  * @table: the sysctl table
2517  * @write: %TRUE if this is a write to the sysctl file
2518  * @buffer: the user buffer
2519  * @lenp: the size of the user buffer
2520  * @ppos: file position
2521  * @ppos: the current position in the file
2522  *
2523  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2524  * values from/to the user buffer, treated as an ASCII string.
2525  * The values read are assumed to be in 1/1000 seconds, and
2526  * are converted into jiffies.
2527  *
2528  * Returns 0 on success.
2529  */
2530 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2531                              void __user *buffer, size_t *lenp, loff_t *ppos)
2532 {
2533         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2534                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2535 }
2536
2537 static int proc_do_cad_pid(struct ctl_table *table, int write,
2538                            void __user *buffer, size_t *lenp, loff_t *ppos)
2539 {
2540         struct pid *new_pid;
2541         pid_t tmp;
2542         int r;
2543
2544         tmp = pid_vnr(cad_pid);
2545
2546         r = __do_proc_dointvec(&tmp, table, write, buffer,
2547                                lenp, ppos, NULL, NULL);
2548         if (r || !write)
2549                 return r;
2550
2551         new_pid = find_get_pid(tmp);
2552         if (!new_pid)
2553                 return -ESRCH;
2554
2555         put_pid(xchg(&cad_pid, new_pid));
2556         return 0;
2557 }
2558
2559 /**
2560  * proc_do_large_bitmap - read/write from/to a large bitmap
2561  * @table: the sysctl table
2562  * @write: %TRUE if this is a write to the sysctl file
2563  * @buffer: the user buffer
2564  * @lenp: the size of the user buffer
2565  * @ppos: file position
2566  *
2567  * The bitmap is stored at table->data and the bitmap length (in bits)
2568  * in table->maxlen.
2569  *
2570  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2571  * large bitmaps may be represented in a compact manner. Writing into
2572  * the file will clear the bitmap then update it with the given input.
2573  *
2574  * Returns 0 on success.
2575  */
2576 int proc_do_large_bitmap(struct ctl_table *table, int write,
2577                          void __user *buffer, size_t *lenp, loff_t *ppos)
2578 {
2579         int err = 0;
2580         bool first = 1;
2581         size_t left = *lenp;
2582         unsigned long bitmap_len = table->maxlen;
2583         unsigned long *bitmap = *(unsigned long **) table->data;
2584         unsigned long *tmp_bitmap = NULL;
2585         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2586
2587         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2588                 *lenp = 0;
2589                 return 0;
2590         }
2591
2592         if (write) {
2593                 unsigned long page = 0;
2594                 char *kbuf;
2595
2596                 if (left > PAGE_SIZE - 1)
2597                         left = PAGE_SIZE - 1;
2598
2599                 page = __get_free_page(GFP_TEMPORARY);
2600                 kbuf = (char *) page;
2601                 if (!kbuf)
2602                         return -ENOMEM;
2603                 if (copy_from_user(kbuf, buffer, left)) {
2604                         free_page(page);
2605                         return -EFAULT;
2606                 }
2607                 kbuf[left] = 0;
2608
2609                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2610                                      GFP_KERNEL);
2611                 if (!tmp_bitmap) {
2612                         free_page(page);
2613                         return -ENOMEM;
2614                 }
2615                 proc_skip_char(&kbuf, &left, '\n');
2616                 while (!err && left) {
2617                         unsigned long val_a, val_b;
2618                         bool neg;
2619
2620                         err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2621                                              sizeof(tr_a), &c);
2622                         if (err)
2623                                 break;
2624                         if (val_a >= bitmap_len || neg) {
2625                                 err = -EINVAL;
2626                                 break;
2627                         }
2628
2629                         val_b = val_a;
2630                         if (left) {
2631                                 kbuf++;
2632                                 left--;
2633                         }
2634
2635                         if (c == '-') {
2636                                 err = proc_get_long(&kbuf, &left, &val_b,
2637                                                      &neg, tr_b, sizeof(tr_b),
2638                                                      &c);
2639                                 if (err)
2640                                         break;
2641                                 if (val_b >= bitmap_len || neg ||
2642                                     val_a > val_b) {
2643                                         err = -EINVAL;
2644                                         break;
2645                                 }
2646                                 if (left) {
2647                                         kbuf++;
2648                                         left--;
2649                                 }
2650                         }
2651
2652                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2653                         first = 0;
2654                         proc_skip_char(&kbuf, &left, '\n');
2655                 }
2656                 free_page(page);
2657         } else {
2658                 unsigned long bit_a, bit_b = 0;
2659
2660                 while (left) {
2661                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2662                         if (bit_a >= bitmap_len)
2663                                 break;
2664                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2665                                                    bit_a + 1) - 1;
2666
2667                         if (!first) {
2668                                 err = proc_put_char(&buffer, &left, ',');
2669                                 if (err)
2670                                         break;
2671                         }
2672                         err = proc_put_long(&buffer, &left, bit_a, false);
2673                         if (err)
2674                                 break;
2675                         if (bit_a != bit_b) {
2676                                 err = proc_put_char(&buffer, &left, '-');
2677                                 if (err)
2678                                         break;
2679                                 err = proc_put_long(&buffer, &left, bit_b, false);
2680                                 if (err)
2681                                         break;
2682                         }
2683
2684                         first = 0; bit_b++;
2685                 }
2686                 if (!err)
2687                         err = proc_put_char(&buffer, &left, '\n');
2688         }
2689
2690         if (!err) {
2691                 if (write) {
2692                         if (*ppos)
2693                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2694                         else
2695                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2696                 }
2697                 kfree(tmp_bitmap);
2698                 *lenp -= left;
2699                 *ppos += *lenp;
2700                 return 0;
2701         } else {
2702                 kfree(tmp_bitmap);
2703                 return err;
2704         }
2705 }
2706
2707 #else /* CONFIG_PROC_SYSCTL */
2708
2709 int proc_dostring(struct ctl_table *table, int write,
2710                   void __user *buffer, size_t *lenp, loff_t *ppos)
2711 {
2712         return -ENOSYS;
2713 }
2714
2715 int proc_dointvec(struct ctl_table *table, int write,
2716                   void __user *buffer, size_t *lenp, loff_t *ppos)
2717 {
2718         return -ENOSYS;
2719 }
2720
2721 int proc_dointvec_minmax(struct ctl_table *table, int write,
2722                     void __user *buffer, size_t *lenp, loff_t *ppos)
2723 {
2724         return -ENOSYS;
2725 }
2726
2727 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2728                     void __user *buffer, size_t *lenp, loff_t *ppos)
2729 {
2730         return -ENOSYS;
2731 }
2732
2733 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2734                     void __user *buffer, size_t *lenp, loff_t *ppos)
2735 {
2736         return -ENOSYS;
2737 }
2738
2739 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2740                              void __user *buffer, size_t *lenp, loff_t *ppos)
2741 {
2742         return -ENOSYS;
2743 }
2744
2745 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2746                     void __user *buffer, size_t *lenp, loff_t *ppos)
2747 {
2748         return -ENOSYS;
2749 }
2750
2751 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2752                                       void __user *buffer,
2753                                       size_t *lenp, loff_t *ppos)
2754 {
2755     return -ENOSYS;
2756 }
2757
2758
2759 #endif /* CONFIG_PROC_SYSCTL */
2760
2761 /*
2762  * No sense putting this after each symbol definition, twice,
2763  * exception granted :-)
2764  */
2765 EXPORT_SYMBOL(proc_dointvec);
2766 EXPORT_SYMBOL(proc_dointvec_jiffies);
2767 EXPORT_SYMBOL(proc_dointvec_minmax);
2768 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2769 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2770 EXPORT_SYMBOL(proc_dostring);
2771 EXPORT_SYMBOL(proc_doulongvec_minmax);
2772 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);