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