kernel/sysctl.c

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