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