kernel/sysctl.c

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