kernel/sysctl.c

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