kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  * Added /proc support, Dec 1995
   6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9  * Dynamic registration fixes, Stephen Tweedie.
  10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12  *  Horn.
  13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16  *  Wendling.
  17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/aio.h>
  23 #include <linux/mm.h>
  24 #include <linux/swap.h>
  25 #include <linux/slab.h>
  26 #include <linux/sysctl.h>
  27 #include <linux/bitmap.h>
  28 #include <linux/signal.h>
  29 #include <linux/printk.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/security.h>
  32 #include <linux/ctype.h>
  33 #include <linux/kmemcheck.h>
  34 #include <linux/kmemleak.h>
  35 #include <linux/fs.h>
  36 #include <linux/init.h>
  37 #include <linux/kernel.h>
  38 #include <linux/kobject.h>
  39 #include <linux/net.h>
  40 #include <linux/sysrq.h>
  41 #include <linux/highuid.h>
  42 #include <linux/writeback.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/compaction.h>
  45 #include <linux/hugetlb.h>
  46 #include <linux/initrd.h>
  47 #include <linux/key.h>
  48 #include <linux/times.h>
  49 #include <linux/limits.h>
  50 #include <linux/dcache.h>
  51 #include <linux/dnotify.h>
  52 #include <linux/syscalls.h>
  53 #include <linux/vmstat.h>
  54 #include <linux/nfs_fs.h>
  55 #include <linux/acpi.h>
  56 #include <linux/reboot.h>
  57 #include <linux/ftrace.h>
  58 #include <linux/perf_event.h>
  59 #include <linux/kprobes.h>
  60 #include <linux/pipe_fs_i.h>
  61 #include <linux/oom.h>
  62 #include <linux/kmod.h>
  63 #include <linux/capability.h>
  64 #include <linux/binfmts.h>
  65 #include <linux/sched/sysctl.h>
  66 #include <linux/kexec.h>
  67 #include <linux/bpf.h>
  68 #include <linux/mount.h>
  69
  70 #include <asm/uaccess.h>
  71 #include <asm/processor.h>
  72
  73 #ifdef CONFIG_X86
  74 #include <asm/nmi.h>
  75 #include <asm/stacktrace.h>
  76 #include <asm/io.h>
  77 #endif
  78 #ifdef CONFIG_SPARC
  79 #include <asm/setup.h>
  80 #endif
  81 #ifdef CONFIG_BSD_PROCESS_ACCT
  82 #include <linux/acct.h>
  83 #endif
  84 #ifdef CONFIG_RT_MUTEXES
  85 #include <linux/rtmutex.h>
  86 #endif
  87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  88 #include <linux/lockdep.h>
  89 #endif
  90 #ifdef CONFIG_CHR_DEV_SG
  91 #include <scsi/sg.h>
  92 #endif
  93
  94 #ifdef CONFIG_LOCKUP_DETECTOR
  95 #include <linux/nmi.h>
  96 #endif
  97
  98 #if defined(CONFIG_SYSCTL)
  99
 100 /* External variables not in a header file. */
 101 extern int suid_dumpable;
 102 #ifdef CONFIG_COREDUMP
 103 extern int core_uses_pid;
 104 extern char core_pattern[];
 105 extern unsigned int core_pipe_limit;
 106 #endif
 107 extern int pid_max;
 108 extern int pid_max_min, pid_max_max;
 109 extern int percpu_pagelist_fraction;
 110 extern int compat_log;
 111 extern int latencytop_enabled;
 112 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 113 #ifndef CONFIG_MMU
 114 extern int sysctl_nr_trim_pages;
 115 #endif
 116
 117 /* Constants used for minimum and  maximum */
 118 #ifdef CONFIG_LOCKUP_DETECTOR
 119 static int sixty = 60;
 120 #endif
 121
 122 static int __maybe_unused neg_one = -1;
 123
 124 static int zero;
 125 static int __maybe_unused one = 1;
 126 static int __maybe_unused two = 2;
 127 static int __maybe_unused four = 4;
 128 static unsigned long one_ul = 1;
 129 static int one_hundred = 100;
 130 static int one_thousand = 1000;
 131 #ifdef CONFIG_PRINTK
 132 static int ten_thousand = 10000;
 133 #endif
 134 #ifdef CONFIG_PERF_EVENTS
 135 static int six_hundred_forty_kb = 640 * 1024;
 136 #endif
 137
 138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 140
 141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 142 static int maxolduid = 65535;
 143 static int minolduid;
 144
 145 static int ngroups_max = NGROUPS_MAX;
 146 static const int cap_last_cap = CAP_LAST_CAP;
 147
 148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
 149 #ifdef CONFIG_DETECT_HUNG_TASK
 150 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
 151 #endif
 152
 153 #ifdef CONFIG_INOTIFY_USER
 154 #include <linux/inotify.h>
 155 #endif
 156 #ifdef CONFIG_SPARC
 157 #endif
 158
 159 #ifdef __hppa__
 160 extern int pwrsw_enabled;
 161 #endif
 162
 163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 164 extern int unaligned_enabled;
 165 #endif
 166
 167 #ifdef CONFIG_IA64
 168 extern int unaligned_dump_stack;
 169 #endif
 170
 171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 172 extern int no_unaligned_warning;
 173 #endif
 174
 175 #ifdef CONFIG_PROC_SYSCTL
 176
 177 #define SYSCTL_WRITES_LEGACY    -1
 178 #define SYSCTL_WRITES_WARN       0
 179 #define SYSCTL_WRITES_STRICT     1
 180
 181 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 182
 183 static int proc_do_cad_pid(struct ctl_table *table, int write,
 184                   void __user *buffer, size_t *lenp, loff_t *ppos);
 185 static int proc_taint(struct ctl_table *table, int write,
 186                                void __user *buffer, size_t *lenp, loff_t *ppos);
 187 #endif
 188
 189 #ifdef CONFIG_PRINTK
 190 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 191                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 192 #endif
 193
 194 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 195                 void __user *buffer, size_t *lenp, loff_t *ppos);
 196 #ifdef CONFIG_COREDUMP
 197 static int proc_dostring_coredump(struct ctl_table *table, int write,
 198                 void __user *buffer, size_t *lenp, loff_t *ppos);
 199 #endif
 200
 201 #ifdef CONFIG_MAGIC_SYSRQ
 202 /* Note: sysrq code uses it's own private copy */
 203 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 204
 205 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 206                                 void __user *buffer, size_t *lenp,
 207                                 loff_t *ppos)
 208 {
 209         int error;
 210
 211         error = proc_dointvec(table, write, buffer, lenp, ppos);
 212         if (error)
 213                 return error;
 214
 215         if (write)
 216                 sysrq_toggle_support(__sysrq_enabled);
 217
 218         return 0;
 219 }
 220
 221 #endif
 222
 223 static struct ctl_table kern_table[];
 224 static struct ctl_table vm_table[];
 225 static struct ctl_table fs_table[];
 226 static struct ctl_table debug_table[];
 227 static struct ctl_table dev_table[];
 228 extern struct ctl_table random_table[];
 229 #ifdef CONFIG_EPOLL
 230 extern struct ctl_table epoll_table[];
 231 #endif
 232
 233 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 234 int sysctl_legacy_va_layout;
 235 #endif
 236
 237 /* The default sysctl tables: */
 238
 239 static struct ctl_table sysctl_base_table[] = {
 240         {
 241                 .procname       = "kernel",
 242                 .mode           = 0555,
 243                 .child          = kern_table,
 244         },
 245         {
 246                 .procname       = "vm",
 247                 .mode           = 0555,
 248                 .child          = vm_table,
 249         },
 250         {
 251                 .procname       = "fs",
 252                 .mode           = 0555,
 253                 .child          = fs_table,
 254         },
 255         {
 256                 .procname       = "debug",
 257                 .mode           = 0555,
 258                 .child          = debug_table,
 259         },
 260         {
 261                 .procname       = "dev",
 262                 .mode           = 0555,
 263                 .child          = dev_table,
 264         },
 265         { }
 266 };
 267
 268 #ifdef CONFIG_SCHED_DEBUG
 269 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 270 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 271 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 272 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 273 #ifdef CONFIG_SMP
 274 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 275 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 276 #endif /* CONFIG_SMP */
 277 #endif /* CONFIG_SCHED_DEBUG */
 278
 279 #ifdef CONFIG_COMPACTION
 280 static int min_extfrag_threshold;
 281 static int max_extfrag_threshold = 1000;
 282 #endif
 283
 284 static struct ctl_table kern_table[] = {
 285         {
 286                 .procname       = "sched_child_runs_first",
 287                 .data           = &sysctl_sched_child_runs_first,
 288                 .maxlen         = sizeof(unsigned int),
 289                 .mode           = 0644,
 290                 .proc_handler   = proc_dointvec,
 291         },
 292 #ifdef CONFIG_SCHED_DEBUG
 293         {
 294                 .procname       = "sched_min_granularity_ns",
 295                 .data           = &sysctl_sched_min_granularity,
 296                 .maxlen         = sizeof(unsigned int),
 297                 .mode           = 0644,
 298                 .proc_handler   = sched_proc_update_handler,
 299                 .extra1         = &min_sched_granularity_ns,
 300                 .extra2         = &max_sched_granularity_ns,
 301         },
 302         {
 303                 .procname       = "sched_latency_ns",
 304                 .data           = &sysctl_sched_latency,
 305                 .maxlen         = sizeof(unsigned int),
 306                 .mode           = 0644,
 307                 .proc_handler   = sched_proc_update_handler,
 308                 .extra1         = &min_sched_granularity_ns,
 309                 .extra2         = &max_sched_granularity_ns,
 310         },
 311         {
 312                 .procname       = "sched_wakeup_granularity_ns",
 313                 .data           = &sysctl_sched_wakeup_granularity,
 314                 .maxlen         = sizeof(unsigned int),
 315                 .mode           = 0644,
 316                 .proc_handler   = sched_proc_update_handler,
 317                 .extra1         = &min_wakeup_granularity_ns,
 318                 .extra2         = &max_wakeup_granularity_ns,
 319         },
 320 #ifdef CONFIG_SMP
 321         {
 322                 .procname       = "sched_tunable_scaling",
 323                 .data           = &sysctl_sched_tunable_scaling,
 324                 .maxlen         = sizeof(enum sched_tunable_scaling),
 325                 .mode           = 0644,
 326                 .proc_handler   = sched_proc_update_handler,
 327                 .extra1         = &min_sched_tunable_scaling,
 328                 .extra2         = &max_sched_tunable_scaling,
 329         },
 330         {
 331                 .procname       = "sched_migration_cost_ns",
 332                 .data           = &sysctl_sched_migration_cost,
 333                 .maxlen         = sizeof(unsigned int),
 334                 .mode           = 0644,
 335                 .proc_handler   = proc_dointvec,
 336         },
 337         {
 338                 .procname       = "sched_nr_migrate",
 339                 .data           = &sysctl_sched_nr_migrate,
 340                 .maxlen         = sizeof(unsigned int),
 341                 .mode           = 0644,
 342                 .proc_handler   = proc_dointvec,
 343         },
 344         {
 345                 .procname       = "sched_time_avg_ms",
 346                 .data           = &sysctl_sched_time_avg,
 347                 .maxlen         = sizeof(unsigned int),
 348                 .mode           = 0644,
 349                 .proc_handler   = proc_dointvec,
 350         },
 351         {
 352                 .procname       = "sched_shares_window_ns",
 353                 .data           = &sysctl_sched_shares_window,
 354                 .maxlen         = sizeof(unsigned int),
 355                 .mode           = 0644,
 356                 .proc_handler   = proc_dointvec,
 357         },
 358 #ifdef CONFIG_SCHEDSTATS
 359         {
 360                 .procname       = "sched_schedstats",
 361                 .data           = NULL,
 362                 .maxlen         = sizeof(unsigned int),
 363                 .mode           = 0644,
 364                 .proc_handler   = sysctl_schedstats,
 365                 .extra1         = &zero,
 366                 .extra2         = &one,
 367         },
 368 #endif /* CONFIG_SCHEDSTATS */
 369 #endif /* CONFIG_SMP */
 370 #ifdef CONFIG_NUMA_BALANCING
 371         {
 372                 .procname       = "numa_balancing_scan_delay_ms",
 373                 .data           = &sysctl_numa_balancing_scan_delay,
 374                 .maxlen         = sizeof(unsigned int),
 375                 .mode           = 0644,
 376                 .proc_handler   = proc_dointvec,
 377         },
 378         {
 379                 .procname       = "numa_balancing_scan_period_min_ms",
 380                 .data           = &sysctl_numa_balancing_scan_period_min,
 381                 .maxlen         = sizeof(unsigned int),
 382                 .mode           = 0644,
 383                 .proc_handler   = proc_dointvec,
 384         },
 385         {
 386                 .procname       = "numa_balancing_scan_period_max_ms",
 387                 .data           = &sysctl_numa_balancing_scan_period_max,
 388                 .maxlen         = sizeof(unsigned int),
 389                 .mode           = 0644,
 390                 .proc_handler   = proc_dointvec,
 391         },
 392         {
 393                 .procname       = "numa_balancing_scan_size_mb",
 394                 .data           = &sysctl_numa_balancing_scan_size,
 395                 .maxlen         = sizeof(unsigned int),
 396                 .mode           = 0644,
 397                 .proc_handler   = proc_dointvec_minmax,
 398                 .extra1         = &one,
 399         },
 400         {
 401                 .procname       = "numa_balancing",
 402                 .data           = NULL, /* filled in by handler */
 403                 .maxlen         = sizeof(unsigned int),
 404                 .mode           = 0644,
 405                 .proc_handler   = sysctl_numa_balancing,
 406                 .extra1         = &zero,
 407                 .extra2         = &one,
 408         },
 409 #endif /* CONFIG_NUMA_BALANCING */
 410 #endif /* CONFIG_SCHED_DEBUG */
 411         {
 412                 .procname       = "sched_rt_period_us",
 413                 .data           = &sysctl_sched_rt_period,
 414                 .maxlen         = sizeof(unsigned int),
 415                 .mode           = 0644,
 416                 .proc_handler   = sched_rt_handler,
 417         },
 418         {
 419                 .procname       = "sched_rt_runtime_us",
 420                 .data           = &sysctl_sched_rt_runtime,
 421                 .maxlen         = sizeof(int),
 422                 .mode           = 0644,
 423                 .proc_handler   = sched_rt_handler,
 424         },
 425         {
 426                 .procname       = "sched_rr_timeslice_ms",
 427                 .data           = &sched_rr_timeslice,
 428                 .maxlen         = sizeof(int),
 429                 .mode           = 0644,
 430                 .proc_handler   = sched_rr_handler,
 431         },
 432 #ifdef CONFIG_SCHED_AUTOGROUP
 433         {
 434                 .procname       = "sched_autogroup_enabled",
 435                 .data           = &sysctl_sched_autogroup_enabled,
 436                 .maxlen         = sizeof(unsigned int),
 437                 .mode           = 0644,
 438                 .proc_handler   = proc_dointvec_minmax,
 439                 .extra1         = &zero,
 440                 .extra2         = &one,
 441         },
 442 #endif
 443 #ifdef CONFIG_CFS_BANDWIDTH
 444         {
 445                 .procname       = "sched_cfs_bandwidth_slice_us",
 446                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 447                 .maxlen         = sizeof(unsigned int),
 448                 .mode           = 0644,
 449                 .proc_handler   = proc_dointvec_minmax,
 450                 .extra1         = &one,
 451         },
 452 #endif
 453 #ifdef CONFIG_PROVE_LOCKING
 454         {
 455                 .procname       = "prove_locking",
 456                 .data           = &prove_locking,
 457                 .maxlen         = sizeof(int),
 458                 .mode           = 0644,
 459                 .proc_handler   = proc_dointvec,
 460         },
 461 #endif
 462 #ifdef CONFIG_LOCK_STAT
 463         {
 464                 .procname       = "lock_stat",
 465                 .data           = &lock_stat,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec,
 469         },
 470 #endif
 471         {
 472                 .procname       = "panic",
 473                 .data           = &panic_timeout,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = proc_dointvec,
 477         },
 478 #ifdef CONFIG_COREDUMP
 479         {
 480                 .procname       = "core_uses_pid",
 481                 .data           = &core_uses_pid,
 482                 .maxlen         = sizeof(int),
 483                 .mode           = 0644,
 484                 .proc_handler   = proc_dointvec,
 485         },
 486         {
 487                 .procname       = "core_pattern",
 488                 .data           = core_pattern,
 489                 .maxlen         = CORENAME_MAX_SIZE,
 490                 .mode           = 0644,
 491                 .proc_handler   = proc_dostring_coredump,
 492         },
 493         {
 494                 .procname       = "core_pipe_limit",
 495                 .data           = &core_pipe_limit,
 496                 .maxlen         = sizeof(unsigned int),
 497                 .mode           = 0644,
 498                 .proc_handler   = proc_dointvec,
 499         },
 500 #endif
 501 #ifdef CONFIG_PROC_SYSCTL
 502         {
 503                 .procname       = "tainted",
 504                 .maxlen         = sizeof(long),
 505                 .mode           = 0644,
 506                 .proc_handler   = proc_taint,
 507         },
 508         {
 509                 .procname       = "sysctl_writes_strict",
 510                 .data           = &sysctl_writes_strict,
 511                 .maxlen         = sizeof(int),
 512                 .mode           = 0644,
 513                 .proc_handler   = proc_dointvec_minmax,
 514                 .extra1         = &neg_one,
 515                 .extra2         = &one,
 516         },
 517 #endif
 518 #ifdef CONFIG_LATENCYTOP
 519         {
 520                 .procname       = "latencytop",
 521                 .data           = &latencytop_enabled,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = sysctl_latencytop,
 525         },
 526 #endif
 527 #ifdef CONFIG_BLK_DEV_INITRD
 528         {
 529                 .procname       = "real-root-dev",
 530                 .data           = &real_root_dev,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = proc_dointvec,
 534         },
 535 #endif
 536         {
 537                 .procname       = "print-fatal-signals",
 538                 .data           = &print_fatal_signals,
 539                 .maxlen         = sizeof(int),
 540                 .mode           = 0644,
 541                 .proc_handler   = proc_dointvec,
 542         },
 543 #ifdef CONFIG_SPARC
 544         {
 545                 .procname       = "reboot-cmd",
 546                 .data           = reboot_command,
 547                 .maxlen         = 256,
 548                 .mode           = 0644,
 549                 .proc_handler   = proc_dostring,
 550         },
 551         {
 552                 .procname       = "stop-a",
 553                 .data           = &stop_a_enabled,
 554                 .maxlen         = sizeof (int),
 555                 .mode           = 0644,
 556                 .proc_handler   = proc_dointvec,
 557         },
 558         {
 559                 .procname       = "scons-poweroff",
 560                 .data           = &scons_pwroff,
 561                 .maxlen         = sizeof (int),
 562                 .mode           = 0644,
 563                 .proc_handler   = proc_dointvec,
 564         },
 565 #endif
 566 #ifdef CONFIG_SPARC64
 567         {
 568                 .procname       = "tsb-ratio",
 569                 .data           = &sysctl_tsb_ratio,
 570                 .maxlen         = sizeof (int),
 571                 .mode           = 0644,
 572                 .proc_handler   = proc_dointvec,
 573         },
 574 #endif
 575 #ifdef __hppa__
 576         {
 577                 .procname       = "soft-power",
 578                 .data           = &pwrsw_enabled,
 579                 .maxlen         = sizeof (int),
 580                 .mode           = 0644,
 581                 .proc_handler   = proc_dointvec,
 582         },
 583 #endif
 584 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 585         {
 586                 .procname       = "unaligned-trap",
 587                 .data           = &unaligned_enabled,
 588                 .maxlen         = sizeof (int),
 589                 .mode           = 0644,
 590                 .proc_handler   = proc_dointvec,
 591         },
 592 #endif
 593         {
 594                 .procname       = "ctrl-alt-del",
 595                 .data           = &C_A_D,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dointvec,
 599         },
 600 #ifdef CONFIG_FUNCTION_TRACER
 601         {
 602                 .procname       = "ftrace_enabled",
 603                 .data           = &ftrace_enabled,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = ftrace_enable_sysctl,
 607         },
 608 #endif
 609 #ifdef CONFIG_STACK_TRACER
 610         {
 611                 .procname       = "stack_tracer_enabled",
 612                 .data           = &stack_tracer_enabled,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = stack_trace_sysctl,
 616         },
 617 #endif
 618 #ifdef CONFIG_TRACING
 619         {
 620                 .procname       = "ftrace_dump_on_oops",
 621                 .data           = &ftrace_dump_on_oops,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = proc_dointvec,
 625         },
 626         {
 627                 .procname       = "traceoff_on_warning",
 628                 .data           = &__disable_trace_on_warning,
 629                 .maxlen         = sizeof(__disable_trace_on_warning),
 630                 .mode           = 0644,
 631                 .proc_handler   = proc_dointvec,
 632         },
 633         {
 634                 .procname       = "tracepoint_printk",
 635                 .data           = &tracepoint_printk,
 636                 .maxlen         = sizeof(tracepoint_printk),
 637                 .mode           = 0644,
 638                 .proc_handler   = proc_dointvec,
 639         },
 640 #endif
 641 #ifdef CONFIG_KEXEC_CORE
 642         {
 643                 .procname       = "kexec_load_disabled",
 644                 .data           = &kexec_load_disabled,
 645                 .maxlen         = sizeof(int),
 646                 .mode           = 0644,
 647                 /* only handle a transition from default "0" to "1" */
 648                 .proc_handler   = proc_dointvec_minmax,
 649                 .extra1         = &one,
 650                 .extra2         = &one,
 651         },
 652 #endif
 653 #ifdef CONFIG_MODULES
 654         {
 655                 .procname       = "modprobe",
 656                 .data           = &modprobe_path,
 657                 .maxlen         = KMOD_PATH_LEN,
 658                 .mode           = 0644,
 659                 .proc_handler   = proc_dostring,
 660         },
 661         {
 662                 .procname       = "modules_disabled",
 663                 .data           = &modules_disabled,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 /* only handle a transition from default "0" to "1" */
 667                 .proc_handler   = proc_dointvec_minmax,
 668                 .extra1         = &one,
 669                 .extra2         = &one,
 670         },
 671 #endif
 672 #ifdef CONFIG_UEVENT_HELPER
 673         {
 674                 .procname       = "hotplug",
 675                 .data           = &uevent_helper,
 676                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 677                 .mode           = 0644,
 678                 .proc_handler   = proc_dostring,
 679         },
 680 #endif
 681 #ifdef CONFIG_CHR_DEV_SG
 682         {
 683                 .procname       = "sg-big-buff",
 684                 .data           = &sg_big_buff,
 685                 .maxlen         = sizeof (int),
 686                 .mode           = 0444,
 687                 .proc_handler   = proc_dointvec,
 688         },
 689 #endif
 690 #ifdef CONFIG_BSD_PROCESS_ACCT
 691         {
 692                 .procname       = "acct",
 693                 .data           = &acct_parm,
 694                 .maxlen         = 3*sizeof(int),
 695                 .mode           = 0644,
 696                 .proc_handler   = proc_dointvec,
 697         },
 698 #endif
 699 #ifdef CONFIG_MAGIC_SYSRQ
 700         {
 701                 .procname       = "sysrq",
 702                 .data           = &__sysrq_enabled,
 703                 .maxlen         = sizeof (int),
 704                 .mode           = 0644,
 705                 .proc_handler   = sysrq_sysctl_handler,
 706         },
 707 #endif
 708 #ifdef CONFIG_PROC_SYSCTL
 709         {
 710                 .procname       = "cad_pid",
 711                 .data           = NULL,
 712                 .maxlen         = sizeof (int),
 713                 .mode           = 0600,
 714                 .proc_handler   = proc_do_cad_pid,
 715         },
 716 #endif
 717         {
 718                 .procname       = "threads-max",
 719                 .data           = NULL,
 720                 .maxlen         = sizeof(int),
 721                 .mode           = 0644,
 722                 .proc_handler   = sysctl_max_threads,
 723         },
 724         {
 725                 .procname       = "random",
 726                 .mode           = 0555,
 727                 .child          = random_table,
 728         },
 729         {
 730                 .procname       = "usermodehelper",
 731                 .mode           = 0555,
 732                 .child          = usermodehelper_table,
 733         },
 734         {
 735                 .procname       = "overflowuid",
 736                 .data           = &overflowuid,
 737                 .maxlen         = sizeof(int),
 738                 .mode           = 0644,
 739                 .proc_handler   = proc_dointvec_minmax,
 740                 .extra1         = &minolduid,
 741                 .extra2         = &maxolduid,
 742         },
 743         {
 744                 .procname       = "overflowgid",
 745                 .data           = &overflowgid,
 746                 .maxlen         = sizeof(int),
 747                 .mode           = 0644,
 748                 .proc_handler   = proc_dointvec_minmax,
 749                 .extra1         = &minolduid,
 750                 .extra2         = &maxolduid,
 751         },
 752 #ifdef CONFIG_S390
 753 #ifdef CONFIG_MATHEMU
 754         {
 755                 .procname       = "ieee_emulation_warnings",
 756                 .data           = &sysctl_ieee_emulation_warnings,
 757                 .maxlen         = sizeof(int),
 758                 .mode           = 0644,
 759                 .proc_handler   = proc_dointvec,
 760         },
 761 #endif
 762         {
 763                 .procname       = "userprocess_debug",
 764                 .data           = &show_unhandled_signals,
 765                 .maxlen         = sizeof(int),
 766                 .mode           = 0644,
 767                 .proc_handler   = proc_dointvec,
 768         },
 769 #endif
 770         {
 771                 .procname       = "pid_max",
 772                 .data           = &pid_max,
 773                 .maxlen         = sizeof (int),
 774                 .mode           = 0644,
 775                 .proc_handler   = proc_dointvec_minmax,
 776                 .extra1         = &pid_max_min,
 777                 .extra2         = &pid_max_max,
 778         },
 779         {
 780                 .procname       = "panic_on_oops",
 781                 .data           = &panic_on_oops,
 782                 .maxlen         = sizeof(int),
 783                 .mode           = 0644,
 784                 .proc_handler   = proc_dointvec,
 785         },
 786 #if defined CONFIG_PRINTK
 787         {
 788                 .procname       = "printk",
 789                 .data           = &console_loglevel,
 790                 .maxlen         = 4*sizeof(int),
 791                 .mode           = 0644,
 792                 .proc_handler   = proc_dointvec,
 793         },
 794         {
 795                 .procname       = "printk_ratelimit",
 796                 .data           = &printk_ratelimit_state.interval,
 797                 .maxlen         = sizeof(int),
 798                 .mode           = 0644,
 799                 .proc_handler   = proc_dointvec_jiffies,
 800         },
 801         {
 802                 .procname       = "printk_ratelimit_burst",
 803                 .data           = &printk_ratelimit_state.burst,
 804                 .maxlen         = sizeof(int),
 805                 .mode           = 0644,
 806                 .proc_handler   = proc_dointvec,
 807         },
 808         {
 809                 .procname       = "printk_delay",
 810                 .data           = &printk_delay_msec,
 811                 .maxlen         = sizeof(int),
 812                 .mode           = 0644,
 813                 .proc_handler   = proc_dointvec_minmax,
 814                 .extra1         = &zero,
 815                 .extra2         = &ten_thousand,
 816         },
 817         {
 818                 .procname       = "printk_devkmsg",
 819                 .data           = devkmsg_log_str,
 820                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
 821                 .mode           = 0644,
 822                 .proc_handler   = devkmsg_sysctl_set_loglvl,
 823         },
 824         {
 825                 .procname       = "dmesg_restrict",
 826                 .data           = &dmesg_restrict,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 830                 .extra1         = &zero,
 831                 .extra2         = &one,
 832         },
 833         {
 834                 .procname       = "kptr_restrict",
 835                 .data           = &kptr_restrict,
 836                 .maxlen         = sizeof(int),
 837                 .mode           = 0644,
 838                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 839                 .extra1         = &zero,
 840                 .extra2         = &two,
 841         },
 842 #endif
 843         {
 844                 .procname       = "ngroups_max",
 845                 .data           = &ngroups_max,
 846                 .maxlen         = sizeof (int),
 847                 .mode           = 0444,
 848                 .proc_handler   = proc_dointvec,
 849         },
 850         {
 851                 .procname       = "cap_last_cap",
 852                 .data           = (void *)&cap_last_cap,
 853                 .maxlen         = sizeof(int),
 854                 .mode           = 0444,
 855                 .proc_handler   = proc_dointvec,
 856         },
 857 #if defined(CONFIG_LOCKUP_DETECTOR)
 858         {
 859                 .procname       = "watchdog",
 860                 .data           = &watchdog_user_enabled,
 861                 .maxlen         = sizeof (int),
 862                 .mode           = 0644,
 863                 .proc_handler   = proc_watchdog,
 864                 .extra1         = &zero,
 865                 .extra2         = &one,
 866         },
 867         {
 868                 .procname       = "watchdog_thresh",
 869                 .data           = &watchdog_thresh,
 870                 .maxlen         = sizeof(int),
 871                 .mode           = 0644,
 872                 .proc_handler   = proc_watchdog_thresh,
 873                 .extra1         = &zero,
 874                 .extra2         = &sixty,
 875         },
 876         {
 877                 .procname       = "nmi_watchdog",
 878                 .data           = &nmi_watchdog_enabled,
 879                 .maxlen         = sizeof (int),
 880                 .mode           = 0644,
 881                 .proc_handler   = proc_nmi_watchdog,
 882                 .extra1         = &zero,
 883 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
 884                 .extra2         = &one,
 885 #else
 886                 .extra2         = &zero,
 887 #endif
 888         },
 889         {
 890                 .procname       = "soft_watchdog",
 891                 .data           = &soft_watchdog_enabled,
 892                 .maxlen         = sizeof (int),
 893                 .mode           = 0644,
 894                 .proc_handler   = proc_soft_watchdog,
 895                 .extra1         = &zero,
 896                 .extra2         = &one,
 897         },
 898         {
 899                 .procname       = "watchdog_cpumask",
 900                 .data           = &watchdog_cpumask_bits,
 901                 .maxlen         = NR_CPUS,
 902                 .mode           = 0644,
 903                 .proc_handler   = proc_watchdog_cpumask,
 904         },
 905         {
 906                 .procname       = "softlockup_panic",
 907                 .data           = &softlockup_panic,
 908                 .maxlen         = sizeof(int),
 909                 .mode           = 0644,
 910                 .proc_handler   = proc_dointvec_minmax,
 911                 .extra1         = &zero,
 912                 .extra2         = &one,
 913         },
 914 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 915         {
 916                 .procname       = "hardlockup_panic",
 917                 .data           = &hardlockup_panic,
 918                 .maxlen         = sizeof(int),
 919                 .mode           = 0644,
 920                 .proc_handler   = proc_dointvec_minmax,
 921                 .extra1         = &zero,
 922                 .extra2         = &one,
 923         },
 924 #endif
 925 #ifdef CONFIG_SMP
 926         {
 927                 .procname       = "softlockup_all_cpu_backtrace",
 928                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 929                 .maxlen         = sizeof(int),
 930                 .mode           = 0644,
 931                 .proc_handler   = proc_dointvec_minmax,
 932                 .extra1         = &zero,
 933                 .extra2         = &one,
 934         },
 935         {
 936                 .procname       = "hardlockup_all_cpu_backtrace",
 937                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
 938                 .maxlen         = sizeof(int),
 939                 .mode           = 0644,
 940                 .proc_handler   = proc_dointvec_minmax,
 941                 .extra1         = &zero,
 942                 .extra2         = &one,
 943         },
 944 #endif /* CONFIG_SMP */
 945 #endif
 946 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 947         {
 948                 .procname       = "unknown_nmi_panic",
 949                 .data           = &unknown_nmi_panic,
 950                 .maxlen         = sizeof (int),
 951                 .mode           = 0644,
 952                 .proc_handler   = proc_dointvec,
 953         },
 954 #endif
 955 #if defined(CONFIG_X86)
 956         {
 957                 .procname       = "panic_on_unrecovered_nmi",
 958                 .data           = &panic_on_unrecovered_nmi,
 959                 .maxlen         = sizeof(int),
 960                 .mode           = 0644,
 961                 .proc_handler   = proc_dointvec,
 962         },
 963         {
 964                 .procname       = "panic_on_io_nmi",
 965                 .data           = &panic_on_io_nmi,
 966                 .maxlen         = sizeof(int),
 967                 .mode           = 0644,
 968                 .proc_handler   = proc_dointvec,
 969         },
 970 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 971         {
 972                 .procname       = "panic_on_stackoverflow",
 973                 .data           = &sysctl_panic_on_stackoverflow,
 974                 .maxlen         = sizeof(int),
 975                 .mode           = 0644,
 976                 .proc_handler   = proc_dointvec,
 977         },
 978 #endif
 979         {
 980                 .procname       = "bootloader_type",
 981                 .data           = &bootloader_type,
 982                 .maxlen         = sizeof (int),
 983                 .mode           = 0444,
 984                 .proc_handler   = proc_dointvec,
 985         },
 986         {
 987                 .procname       = "bootloader_version",
 988                 .data           = &bootloader_version,
 989                 .maxlen         = sizeof (int),
 990                 .mode           = 0444,
 991                 .proc_handler   = proc_dointvec,
 992         },
 993         {
 994                 .procname       = "kstack_depth_to_print",
 995                 .data           = &kstack_depth_to_print,
 996                 .maxlen         = sizeof(int),
 997                 .mode           = 0644,
 998                 .proc_handler   = proc_dointvec,
 999         },
1000         {
1001                 .procname       = "io_delay_type",
1002                 .data           = &io_delay_type,
1003                 .maxlen         = sizeof(int),
1004                 .mode           = 0644,
1005                 .proc_handler   = proc_dointvec,
1006         },
1007 #endif
1008 #if defined(CONFIG_MMU)
1009         {
1010                 .procname       = "randomize_va_space",
1011                 .data           = &randomize_va_space,
1012                 .maxlen         = sizeof(int),
1013                 .mode           = 0644,
1014                 .proc_handler   = proc_dointvec,
1015         },
1016 #endif
1017 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1018         {
1019                 .procname       = "spin_retry",
1020                 .data           = &spin_retry,
1021                 .maxlen         = sizeof (int),
1022                 .mode           = 0644,
1023                 .proc_handler   = proc_dointvec,
1024         },
1025 #endif
1026 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1027         {
1028                 .procname       = "acpi_video_flags",
1029                 .data           = &acpi_realmode_flags,
1030                 .maxlen         = sizeof (unsigned long),
1031                 .mode           = 0644,
1032                 .proc_handler   = proc_doulongvec_minmax,
1033         },
1034 #endif
1035 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1036         {
1037                 .procname       = "ignore-unaligned-usertrap",
1038                 .data           = &no_unaligned_warning,
1039                 .maxlen         = sizeof (int),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_dointvec,
1042         },
1043 #endif
1044 #ifdef CONFIG_IA64
1045         {
1046                 .procname       = "unaligned-dump-stack",
1047                 .data           = &unaligned_dump_stack,
1048                 .maxlen         = sizeof (int),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_dointvec,
1051         },
1052 #endif
1053 #ifdef CONFIG_DETECT_HUNG_TASK
1054         {
1055                 .procname       = "hung_task_panic",
1056                 .data           = &sysctl_hung_task_panic,
1057                 .maxlen         = sizeof(int),
1058                 .mode           = 0644,
1059                 .proc_handler   = proc_dointvec_minmax,
1060                 .extra1         = &zero,
1061                 .extra2         = &one,
1062         },
1063         {
1064                 .procname       = "hung_task_check_count",
1065                 .data           = &sysctl_hung_task_check_count,
1066                 .maxlen         = sizeof(int),
1067                 .mode           = 0644,
1068                 .proc_handler   = proc_dointvec_minmax,
1069                 .extra1         = &zero,
1070         },
1071         {
1072                 .procname       = "hung_task_timeout_secs",
1073                 .data           = &sysctl_hung_task_timeout_secs,
1074                 .maxlen         = sizeof(unsigned long),
1075                 .mode           = 0644,
1076                 .proc_handler   = proc_dohung_task_timeout_secs,
1077                 .extra2         = &hung_task_timeout_max,
1078         },
1079         {
1080                 .procname       = "hung_task_warnings",
1081                 .data           = &sysctl_hung_task_warnings,
1082                 .maxlen         = sizeof(int),
1083                 .mode           = 0644,
1084                 .proc_handler   = proc_dointvec_minmax,
1085                 .extra1         = &neg_one,
1086         },
1087 #endif
1088 #ifdef CONFIG_COMPAT
1089         {
1090                 .procname       = "compat-log",
1091                 .data           = &compat_log,
1092                 .maxlen         = sizeof (int),
1093                 .mode           = 0644,
1094                 .proc_handler   = proc_dointvec,
1095         },
1096 #endif
1097 #ifdef CONFIG_RT_MUTEXES
1098         {
1099                 .procname       = "max_lock_depth",
1100                 .data           = &max_lock_depth,
1101                 .maxlen         = sizeof(int),
1102                 .mode           = 0644,
1103                 .proc_handler   = proc_dointvec,
1104         },
1105 #endif
1106         {
1107                 .procname       = "poweroff_cmd",
1108                 .data           = &poweroff_cmd,
1109                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1110                 .mode           = 0644,
1111                 .proc_handler   = proc_dostring,
1112         },
1113 #ifdef CONFIG_KEYS
1114         {
1115                 .procname       = "keys",
1116                 .mode           = 0555,
1117                 .child          = key_sysctls,
1118         },
1119 #endif
1120 #ifdef CONFIG_PERF_EVENTS
1121         /*
1122          * User-space scripts rely on the existence of this file
1123          * as a feature check for perf_events being enabled.
1124          *
1125          * So it's an ABI, do not remove!
1126          */
1127         {
1128                 .procname       = "perf_event_paranoid",
1129                 .data           = &sysctl_perf_event_paranoid,
1130                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1131                 .mode           = 0644,
1132                 .proc_handler   = proc_dointvec,
1133         },
1134         {
1135                 .procname       = "perf_event_mlock_kb",
1136                 .data           = &sysctl_perf_event_mlock,
1137                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1138                 .mode           = 0644,
1139                 .proc_handler   = proc_dointvec,
1140         },
1141         {
1142                 .procname       = "perf_event_max_sample_rate",
1143                 .data           = &sysctl_perf_event_sample_rate,
1144                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1145                 .mode           = 0644,
1146                 .proc_handler   = perf_proc_update_handler,
1147                 .extra1         = &one,
1148         },
1149         {
1150                 .procname       = "perf_cpu_time_max_percent",
1151                 .data           = &sysctl_perf_cpu_time_max_percent,
1152                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1153                 .mode           = 0644,
1154                 .proc_handler   = perf_cpu_time_max_percent_handler,
1155                 .extra1         = &zero,
1156                 .extra2         = &one_hundred,
1157         },
1158         {
1159                 .procname       = "perf_event_max_stack",
1160                 .data           = &sysctl_perf_event_max_stack,
1161                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
1162                 .mode           = 0644,
1163                 .proc_handler   = perf_event_max_stack_handler,
1164                 .extra1         = &zero,
1165                 .extra2         = &six_hundred_forty_kb,
1166         },
1167         {
1168                 .procname       = "perf_event_max_contexts_per_stack",
1169                 .data           = &sysctl_perf_event_max_contexts_per_stack,
1170                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
1171                 .mode           = 0644,
1172                 .proc_handler   = perf_event_max_stack_handler,
1173                 .extra1         = &zero,
1174                 .extra2         = &one_thousand,
1175         },
1176 #endif
1177 #ifdef CONFIG_KMEMCHECK
1178         {
1179                 .procname       = "kmemcheck",
1180                 .data           = &kmemcheck_enabled,
1181                 .maxlen         = sizeof(int),
1182                 .mode           = 0644,
1183                 .proc_handler   = proc_dointvec,
1184         },
1185 #endif
1186         {
1187                 .procname       = "panic_on_warn",
1188                 .data           = &panic_on_warn,
1189                 .maxlen         = sizeof(int),
1190                 .mode           = 0644,
1191                 .proc_handler   = proc_dointvec_minmax,
1192                 .extra1         = &zero,
1193                 .extra2         = &one,
1194         },
1195 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1196         {
1197                 .procname       = "timer_migration",
1198                 .data           = &sysctl_timer_migration,
1199                 .maxlen         = sizeof(unsigned int),
1200                 .mode           = 0644,
1201                 .proc_handler   = timer_migration_handler,
1202         },
1203 #endif
1204 #ifdef CONFIG_BPF_SYSCALL
1205         {
1206                 .procname       = "unprivileged_bpf_disabled",
1207                 .data           = &sysctl_unprivileged_bpf_disabled,
1208                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
1209                 .mode           = 0644,
1210                 /* only handle a transition from default "0" to "1" */
1211                 .proc_handler   = proc_dointvec_minmax,
1212                 .extra1         = &one,
1213                 .extra2         = &one,
1214         },
1215 #endif
1216 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1217         {
1218                 .procname       = "panic_on_rcu_stall",
1219                 .data           = &sysctl_panic_on_rcu_stall,
1220                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
1221                 .mode           = 0644,
1222                 .proc_handler   = proc_dointvec_minmax,
1223                 .extra1         = &zero,
1224                 .extra2         = &one,
1225         },
1226 #endif
1227         { }
1228 };
1229
1230 static struct ctl_table vm_table[] = {
1231         {
1232                 .procname       = "overcommit_memory",
1233                 .data           = &sysctl_overcommit_memory,
1234                 .maxlen         = sizeof(sysctl_overcommit_memory),
1235                 .mode           = 0644,
1236                 .proc_handler   = proc_dointvec_minmax,
1237                 .extra1         = &zero,
1238                 .extra2         = &two,
1239         },
1240         {
1241                 .procname       = "panic_on_oom",
1242                 .data           = &sysctl_panic_on_oom,
1243                 .maxlen         = sizeof(sysctl_panic_on_oom),
1244                 .mode           = 0644,
1245                 .proc_handler   = proc_dointvec_minmax,
1246                 .extra1         = &zero,
1247                 .extra2         = &two,
1248         },
1249         {
1250                 .procname       = "oom_kill_allocating_task",
1251                 .data           = &sysctl_oom_kill_allocating_task,
1252                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1253                 .mode           = 0644,
1254                 .proc_handler   = proc_dointvec,
1255         },
1256         {
1257                 .procname       = "oom_dump_tasks",
1258                 .data           = &sysctl_oom_dump_tasks,
1259                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1260                 .mode           = 0644,
1261                 .proc_handler   = proc_dointvec,
1262         },
1263         {
1264                 .procname       = "overcommit_ratio",
1265                 .data           = &sysctl_overcommit_ratio,
1266                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1267                 .mode           = 0644,
1268                 .proc_handler   = overcommit_ratio_handler,
1269         },
1270         {
1271                 .procname       = "overcommit_kbytes",
1272                 .data           = &sysctl_overcommit_kbytes,
1273                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1274                 .mode           = 0644,
1275                 .proc_handler   = overcommit_kbytes_handler,
1276         },
1277         {
1278                 .procname       = "page-cluster",
1279                 .data           = &page_cluster,
1280                 .maxlen         = sizeof(int),
1281                 .mode           = 0644,
1282                 .proc_handler   = proc_dointvec_minmax,
1283                 .extra1         = &zero,
1284         },
1285         {
1286                 .procname       = "dirty_background_ratio",
1287                 .data           = &dirty_background_ratio,
1288                 .maxlen         = sizeof(dirty_background_ratio),
1289                 .mode           = 0644,
1290                 .proc_handler   = dirty_background_ratio_handler,
1291                 .extra1         = &zero,
1292                 .extra2         = &one_hundred,
1293         },
1294         {
1295                 .procname       = "dirty_background_bytes",
1296                 .data           = &dirty_background_bytes,
1297                 .maxlen         = sizeof(dirty_background_bytes),
1298                 .mode           = 0644,
1299                 .proc_handler   = dirty_background_bytes_handler,
1300                 .extra1         = &one_ul,
1301         },
1302         {
1303                 .procname       = "dirty_ratio",
1304                 .data           = &vm_dirty_ratio,
1305                 .maxlen         = sizeof(vm_dirty_ratio),
1306                 .mode           = 0644,
1307                 .proc_handler   = dirty_ratio_handler,
1308                 .extra1         = &zero,
1309                 .extra2         = &one_hundred,
1310         },
1311         {
1312                 .procname       = "dirty_bytes",
1313                 .data           = &vm_dirty_bytes,
1314                 .maxlen         = sizeof(vm_dirty_bytes),
1315                 .mode           = 0644,
1316                 .proc_handler   = dirty_bytes_handler,
1317                 .extra1         = &dirty_bytes_min,
1318         },
1319         {
1320                 .procname       = "dirty_writeback_centisecs",
1321                 .data           = &dirty_writeback_interval,
1322                 .maxlen         = sizeof(dirty_writeback_interval),
1323                 .mode           = 0644,
1324                 .proc_handler   = dirty_writeback_centisecs_handler,
1325         },
1326         {
1327                 .procname       = "dirty_expire_centisecs",
1328                 .data           = &dirty_expire_interval,
1329                 .maxlen         = sizeof(dirty_expire_interval),
1330                 .mode           = 0644,
1331                 .proc_handler   = proc_dointvec_minmax,
1332                 .extra1         = &zero,
1333         },
1334         {
1335                 .procname       = "dirtytime_expire_seconds",
1336                 .data           = &dirtytime_expire_interval,
1337                 .maxlen         = sizeof(dirty_expire_interval),
1338                 .mode           = 0644,
1339                 .proc_handler   = dirtytime_interval_handler,
1340                 .extra1         = &zero,
1341         },
1342         {
1343                 .procname       = "nr_pdflush_threads",
1344                 .mode           = 0444 /* read-only */,
1345                 .proc_handler   = pdflush_proc_obsolete,
1346         },
1347         {
1348                 .procname       = "swappiness",
1349                 .data           = &vm_swappiness,
1350                 .maxlen         = sizeof(vm_swappiness),
1351                 .mode           = 0644,
1352                 .proc_handler   = proc_dointvec_minmax,
1353                 .extra1         = &zero,
1354                 .extra2         = &one_hundred,
1355         },
1356 #ifdef CONFIG_HUGETLB_PAGE
1357         {
1358                 .procname       = "nr_hugepages",
1359                 .data           = NULL,
1360                 .maxlen         = sizeof(unsigned long),
1361                 .mode           = 0644,
1362                 .proc_handler   = hugetlb_sysctl_handler,
1363         },
1364 #ifdef CONFIG_NUMA
1365         {
1366                 .procname       = "nr_hugepages_mempolicy",
1367                 .data           = NULL,
1368                 .maxlen         = sizeof(unsigned long),
1369                 .mode           = 0644,
1370                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1371         },
1372 #endif
1373          {
1374                 .procname       = "hugetlb_shm_group",
1375                 .data           = &sysctl_hugetlb_shm_group,
1376                 .maxlen         = sizeof(gid_t),
1377                 .mode           = 0644,
1378                 .proc_handler   = proc_dointvec,
1379          },
1380          {
1381                 .procname       = "hugepages_treat_as_movable",
1382                 .data           = &hugepages_treat_as_movable,
1383                 .maxlen         = sizeof(int),
1384                 .mode           = 0644,
1385                 .proc_handler   = proc_dointvec,
1386         },
1387         {
1388                 .procname       = "nr_overcommit_hugepages",
1389                 .data           = NULL,
1390                 .maxlen         = sizeof(unsigned long),
1391                 .mode           = 0644,
1392                 .proc_handler   = hugetlb_overcommit_handler,
1393         },
1394 #endif
1395         {
1396                 .procname       = "lowmem_reserve_ratio",
1397                 .data           = &sysctl_lowmem_reserve_ratio,
1398                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1399                 .mode           = 0644,
1400                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1401         },
1402         {
1403                 .procname       = "drop_caches",
1404                 .data           = &sysctl_drop_caches,
1405                 .maxlen         = sizeof(int),
1406                 .mode           = 0644,
1407                 .proc_handler   = drop_caches_sysctl_handler,
1408                 .extra1         = &one,
1409                 .extra2         = &four,
1410         },
1411 #ifdef CONFIG_COMPACTION
1412         {
1413                 .procname       = "compact_memory",
1414                 .data           = &sysctl_compact_memory,
1415                 .maxlen         = sizeof(int),
1416                 .mode           = 0200,
1417                 .proc_handler   = sysctl_compaction_handler,
1418         },
1419         {
1420                 .procname       = "extfrag_threshold",
1421                 .data           = &sysctl_extfrag_threshold,
1422                 .maxlen         = sizeof(int),
1423                 .mode           = 0644,
1424                 .proc_handler   = sysctl_extfrag_handler,
1425                 .extra1         = &min_extfrag_threshold,
1426                 .extra2         = &max_extfrag_threshold,
1427         },
1428         {
1429                 .procname       = "compact_unevictable_allowed",
1430                 .data           = &sysctl_compact_unevictable_allowed,
1431                 .maxlen         = sizeof(int),
1432                 .mode           = 0644,
1433                 .proc_handler   = proc_dointvec,
1434                 .extra1         = &zero,
1435                 .extra2         = &one,
1436         },
1437
1438 #endif /* CONFIG_COMPACTION */
1439         {
1440                 .procname       = "min_free_kbytes",
1441                 .data           = &min_free_kbytes,
1442                 .maxlen         = sizeof(min_free_kbytes),
1443                 .mode           = 0644,
1444                 .proc_handler   = min_free_kbytes_sysctl_handler,
1445                 .extra1         = &zero,
1446         },
1447         {
1448                 .procname       = "watermark_scale_factor",
1449                 .data           = &watermark_scale_factor,
1450                 .maxlen         = sizeof(watermark_scale_factor),
1451                 .mode           = 0644,
1452                 .proc_handler   = watermark_scale_factor_sysctl_handler,
1453                 .extra1         = &one,
1454                 .extra2         = &one_thousand,
1455         },
1456         {
1457                 .procname       = "percpu_pagelist_fraction",
1458                 .data           = &percpu_pagelist_fraction,
1459                 .maxlen         = sizeof(percpu_pagelist_fraction),
1460                 .mode           = 0644,
1461                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1462                 .extra1         = &zero,
1463         },
1464 #ifdef CONFIG_MMU
1465         {
1466                 .procname       = "max_map_count",
1467                 .data           = &sysctl_max_map_count,
1468                 .maxlen         = sizeof(sysctl_max_map_count),
1469                 .mode           = 0644,
1470                 .proc_handler   = proc_dointvec_minmax,
1471                 .extra1         = &zero,
1472         },
1473 #else
1474         {
1475                 .procname       = "nr_trim_pages",
1476                 .data           = &sysctl_nr_trim_pages,
1477                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1478                 .mode           = 0644,
1479                 .proc_handler   = proc_dointvec_minmax,
1480                 .extra1         = &zero,
1481         },
1482 #endif
1483         {
1484                 .procname       = "laptop_mode",
1485                 .data           = &laptop_mode,
1486                 .maxlen         = sizeof(laptop_mode),
1487                 .mode           = 0644,
1488                 .proc_handler   = proc_dointvec_jiffies,
1489         },
1490         {
1491                 .procname       = "block_dump",
1492                 .data           = &block_dump,
1493                 .maxlen         = sizeof(block_dump),
1494                 .mode           = 0644,
1495                 .proc_handler   = proc_dointvec,
1496                 .extra1         = &zero,
1497         },
1498         {
1499                 .procname       = "vfs_cache_pressure",
1500                 .data           = &sysctl_vfs_cache_pressure,
1501                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1502                 .mode           = 0644,
1503                 .proc_handler   = proc_dointvec,
1504                 .extra1         = &zero,
1505         },
1506 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1507         {
1508                 .procname       = "legacy_va_layout",
1509                 .data           = &sysctl_legacy_va_layout,
1510                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1511                 .mode           = 0644,
1512                 .proc_handler   = proc_dointvec,
1513                 .extra1         = &zero,
1514         },
1515 #endif
1516 #ifdef CONFIG_NUMA
1517         {
1518                 .procname       = "zone_reclaim_mode",
1519                 .data           = &node_reclaim_mode,
1520                 .maxlen         = sizeof(node_reclaim_mode),
1521                 .mode           = 0644,
1522                 .proc_handler   = proc_dointvec,
1523                 .extra1         = &zero,
1524         },
1525         {
1526                 .procname       = "min_unmapped_ratio",
1527                 .data           = &sysctl_min_unmapped_ratio,
1528                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1529                 .mode           = 0644,
1530                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1531                 .extra1         = &zero,
1532                 .extra2         = &one_hundred,
1533         },
1534         {
1535                 .procname       = "min_slab_ratio",
1536                 .data           = &sysctl_min_slab_ratio,
1537                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1538                 .mode           = 0644,
1539                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1540                 .extra1         = &zero,
1541                 .extra2         = &one_hundred,
1542         },
1543 #endif
1544 #ifdef CONFIG_SMP
1545         {
1546                 .procname       = "stat_interval",
1547                 .data           = &sysctl_stat_interval,
1548                 .maxlen         = sizeof(sysctl_stat_interval),
1549                 .mode           = 0644,
1550                 .proc_handler   = proc_dointvec_jiffies,
1551         },
1552         {
1553                 .procname       = "stat_refresh",
1554                 .data           = NULL,
1555                 .maxlen         = 0,
1556                 .mode           = 0600,
1557                 .proc_handler   = vmstat_refresh,
1558         },
1559 #endif
1560 #ifdef CONFIG_MMU
1561         {
1562                 .procname       = "mmap_min_addr",
1563                 .data           = &dac_mmap_min_addr,
1564                 .maxlen         = sizeof(unsigned long),
1565                 .mode           = 0644,
1566                 .proc_handler   = mmap_min_addr_handler,
1567         },
1568 #endif
1569 #ifdef CONFIG_NUMA
1570         {
1571                 .procname       = "numa_zonelist_order",
1572                 .data           = &numa_zonelist_order,
1573                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1574                 .mode           = 0644,
1575                 .proc_handler   = numa_zonelist_order_handler,
1576         },
1577 #endif
1578 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1579    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1580         {
1581                 .procname       = "vdso_enabled",
1582 #ifdef CONFIG_X86_32
1583                 .data           = &vdso32_enabled,
1584                 .maxlen         = sizeof(vdso32_enabled),
1585 #else
1586                 .data           = &vdso_enabled,
1587                 .maxlen         = sizeof(vdso_enabled),
1588 #endif
1589                 .mode           = 0644,
1590                 .proc_handler   = proc_dointvec,
1591                 .extra1         = &zero,
1592         },
1593 #endif
1594 #ifdef CONFIG_HIGHMEM
1595         {
1596                 .procname       = "highmem_is_dirtyable",
1597                 .data           = &vm_highmem_is_dirtyable,
1598                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1599                 .mode           = 0644,
1600                 .proc_handler   = proc_dointvec_minmax,
1601                 .extra1         = &zero,
1602                 .extra2         = &one,
1603         },
1604 #endif
1605 #ifdef CONFIG_MEMORY_FAILURE
1606         {
1607                 .procname       = "memory_failure_early_kill",
1608                 .data           = &sysctl_memory_failure_early_kill,
1609                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1610                 .mode           = 0644,
1611                 .proc_handler   = proc_dointvec_minmax,
1612                 .extra1         = &zero,
1613                 .extra2         = &one,
1614         },
1615         {
1616                 .procname       = "memory_failure_recovery",
1617                 .data           = &sysctl_memory_failure_recovery,
1618                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1619                 .mode           = 0644,
1620                 .proc_handler   = proc_dointvec_minmax,
1621                 .extra1         = &zero,
1622                 .extra2         = &one,
1623         },
1624 #endif
1625         {
1626                 .procname       = "user_reserve_kbytes",
1627                 .data           = &sysctl_user_reserve_kbytes,
1628                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1629                 .mode           = 0644,
1630                 .proc_handler   = proc_doulongvec_minmax,
1631         },
1632         {
1633                 .procname       = "admin_reserve_kbytes",
1634                 .data           = &sysctl_admin_reserve_kbytes,
1635                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1636                 .mode           = 0644,
1637                 .proc_handler   = proc_doulongvec_minmax,
1638         },
1639 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1640         {
1641                 .procname       = "mmap_rnd_bits",
1642                 .data           = &mmap_rnd_bits,
1643                 .maxlen         = sizeof(mmap_rnd_bits),
1644                 .mode           = 0600,
1645                 .proc_handler   = proc_dointvec_minmax,
1646                 .extra1         = (void *)&mmap_rnd_bits_min,
1647                 .extra2         = (void *)&mmap_rnd_bits_max,
1648         },
1649 #endif
1650 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1651         {
1652                 .procname       = "mmap_rnd_compat_bits",
1653                 .data           = &mmap_rnd_compat_bits,
1654                 .maxlen         = sizeof(mmap_rnd_compat_bits),
1655                 .mode           = 0600,
1656                 .proc_handler   = proc_dointvec_minmax,
1657                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
1658                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
1659         },
1660 #endif
1661         { }
1662 };
1663
1664 static struct ctl_table fs_table[] = {
1665         {
1666                 .procname       = "inode-nr",
1667                 .data           = &inodes_stat,
1668                 .maxlen         = 2*sizeof(long),
1669                 .mode           = 0444,
1670                 .proc_handler   = proc_nr_inodes,
1671         },
1672         {
1673                 .procname       = "inode-state",
1674                 .data           = &inodes_stat,
1675                 .maxlen         = 7*sizeof(long),
1676                 .mode           = 0444,
1677                 .proc_handler   = proc_nr_inodes,
1678         },
1679         {
1680                 .procname       = "file-nr",
1681                 .data           = &files_stat,
1682                 .maxlen         = sizeof(files_stat),
1683                 .mode           = 0444,
1684                 .proc_handler   = proc_nr_files,
1685         },
1686         {
1687                 .procname       = "file-max",
1688                 .data           = &files_stat.max_files,
1689                 .maxlen         = sizeof(files_stat.max_files),
1690                 .mode           = 0644,
1691                 .proc_handler   = proc_doulongvec_minmax,
1692         },
1693         {
1694                 .procname       = "nr_open",
1695                 .data           = &sysctl_nr_open,
1696                 .maxlen         = sizeof(int),
1697                 .mode           = 0644,
1698                 .proc_handler   = proc_dointvec_minmax,
1699                 .extra1         = &sysctl_nr_open_min,
1700                 .extra2         = &sysctl_nr_open_max,
1701         },
1702         {
1703                 .procname       = "dentry-state",
1704                 .data           = &dentry_stat,
1705                 .maxlen         = 6*sizeof(long),
1706                 .mode           = 0444,
1707                 .proc_handler   = proc_nr_dentry,
1708         },
1709         {
1710                 .procname       = "overflowuid",
1711                 .data           = &fs_overflowuid,
1712                 .maxlen         = sizeof(int),
1713                 .mode           = 0644,
1714                 .proc_handler   = proc_dointvec_minmax,
1715                 .extra1         = &minolduid,
1716                 .extra2         = &maxolduid,
1717         },
1718         {
1719                 .procname       = "overflowgid",
1720                 .data           = &fs_overflowgid,
1721                 .maxlen         = sizeof(int),
1722                 .mode           = 0644,
1723                 .proc_handler   = proc_dointvec_minmax,
1724                 .extra1         = &minolduid,
1725                 .extra2         = &maxolduid,
1726         },
1727 #ifdef CONFIG_FILE_LOCKING
1728         {
1729                 .procname       = "leases-enable",
1730                 .data           = &leases_enable,
1731                 .maxlen         = sizeof(int),
1732                 .mode           = 0644,
1733                 .proc_handler   = proc_dointvec,
1734         },
1735 #endif
1736 #ifdef CONFIG_DNOTIFY
1737         {
1738                 .procname       = "dir-notify-enable",
1739                 .data           = &dir_notify_enable,
1740                 .maxlen         = sizeof(int),
1741                 .mode           = 0644,
1742                 .proc_handler   = proc_dointvec,
1743         },
1744 #endif
1745 #ifdef CONFIG_MMU
1746 #ifdef CONFIG_FILE_LOCKING
1747         {
1748                 .procname       = "lease-break-time",
1749                 .data           = &lease_break_time,
1750                 .maxlen         = sizeof(int),
1751                 .mode           = 0644,
1752                 .proc_handler   = proc_dointvec,
1753         },
1754 #endif
1755 #ifdef CONFIG_AIO
1756         {
1757                 .procname       = "aio-nr",
1758                 .data           = &aio_nr,
1759                 .maxlen         = sizeof(aio_nr),
1760                 .mode           = 0444,
1761                 .proc_handler   = proc_doulongvec_minmax,
1762         },
1763         {
1764                 .procname       = "aio-max-nr",
1765                 .data           = &aio_max_nr,
1766                 .maxlen         = sizeof(aio_max_nr),
1767                 .mode           = 0644,
1768                 .proc_handler   = proc_doulongvec_minmax,
1769         },
1770 #endif /* CONFIG_AIO */
1771 #ifdef CONFIG_INOTIFY_USER
1772         {
1773                 .procname       = "inotify",
1774                 .mode           = 0555,
1775                 .child          = inotify_table,
1776         },
1777 #endif
1778 #ifdef CONFIG_EPOLL
1779         {
1780                 .procname       = "epoll",
1781                 .mode           = 0555,
1782                 .child          = epoll_table,
1783         },
1784 #endif
1785 #endif
1786         {
1787                 .procname       = "protected_symlinks",
1788                 .data           = &sysctl_protected_symlinks,
1789                 .maxlen         = sizeof(int),
1790                 .mode           = 0600,
1791                 .proc_handler   = proc_dointvec_minmax,
1792                 .extra1         = &zero,
1793                 .extra2         = &one,
1794         },
1795         {
1796                 .procname       = "protected_hardlinks",
1797                 .data           = &sysctl_protected_hardlinks,
1798                 .maxlen         = sizeof(int),
1799                 .mode           = 0600,
1800                 .proc_handler   = proc_dointvec_minmax,
1801                 .extra1         = &zero,
1802                 .extra2         = &one,
1803         },
1804         {
1805                 .procname       = "suid_dumpable",
1806                 .data           = &suid_dumpable,
1807                 .maxlen         = sizeof(int),
1808                 .mode           = 0644,
1809                 .proc_handler   = proc_dointvec_minmax_coredump,
1810                 .extra1         = &zero,
1811                 .extra2         = &two,
1812         },
1813 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1814         {
1815                 .procname       = "binfmt_misc",
1816                 .mode           = 0555,
1817                 .child          = sysctl_mount_point,
1818         },
1819 #endif
1820         {
1821                 .procname       = "pipe-max-size",
1822                 .data           = &pipe_max_size,
1823                 .maxlen         = sizeof(int),
1824                 .mode           = 0644,
1825                 .proc_handler   = &pipe_proc_fn,
1826                 .extra1         = &pipe_min_size,
1827         },
1828         {
1829                 .procname       = "pipe-user-pages-hard",
1830                 .data           = &pipe_user_pages_hard,
1831                 .maxlen         = sizeof(pipe_user_pages_hard),
1832                 .mode           = 0644,
1833                 .proc_handler   = proc_doulongvec_minmax,
1834         },
1835         {
1836                 .procname       = "pipe-user-pages-soft",
1837                 .data           = &pipe_user_pages_soft,
1838                 .maxlen         = sizeof(pipe_user_pages_soft),
1839                 .mode           = 0644,
1840                 .proc_handler   = proc_doulongvec_minmax,
1841         },
1842         {
1843                 .procname       = "mount-max",
1844                 .data           = &sysctl_mount_max,
1845                 .maxlen         = sizeof(unsigned int),
1846                 .mode           = 0644,
1847                 .proc_handler   = proc_dointvec_minmax,
1848                 .extra1         = &one,
1849         },
1850         { }
1851 };
1852
1853 static struct ctl_table debug_table[] = {
1854 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1855         {
1856                 .procname       = "exception-trace",
1857                 .data           = &show_unhandled_signals,
1858                 .maxlen         = sizeof(int),
1859                 .mode           = 0644,
1860                 .proc_handler   = proc_dointvec
1861         },
1862 #endif
1863 #if defined(CONFIG_OPTPROBES)
1864         {
1865                 .procname       = "kprobes-optimization",
1866                 .data           = &sysctl_kprobes_optimization,
1867                 .maxlen         = sizeof(int),
1868                 .mode           = 0644,
1869                 .proc_handler   = proc_kprobes_optimization_handler,
1870                 .extra1         = &zero,
1871                 .extra2         = &one,
1872         },
1873 #endif
1874         { }
1875 };
1876
1877 static struct ctl_table dev_table[] = {
1878         { }
1879 };
1880
1881 int __init sysctl_init(void)
1882 {
1883         struct ctl_table_header *hdr;
1884
1885         hdr = register_sysctl_table(sysctl_base_table);
1886         kmemleak_not_leak(hdr);
1887         return 0;
1888 }
1889
1890 #endif /* CONFIG_SYSCTL */
1891
1892 /*
1893  * /proc/sys support
1894  */
1895
1896 #ifdef CONFIG_PROC_SYSCTL
1897
1898 static int _proc_do_string(char *data, int maxlen, int write,
1899                            char __user *buffer,
1900                            size_t *lenp, loff_t *ppos)
1901 {
1902         size_t len;
1903         char __user *p;
1904         char c;
1905
1906         if (!data || !maxlen || !*lenp) {
1907                 *lenp = 0;
1908                 return 0;
1909         }
1910
1911         if (write) {
1912                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1913                         /* Only continue writes not past the end of buffer. */
1914                         len = strlen(data);
1915                         if (len > maxlen - 1)
1916                                 len = maxlen - 1;
1917
1918                         if (*ppos > len)
1919                                 return 0;
1920                         len = *ppos;
1921                 } else {
1922                         /* Start writing from beginning of buffer. */
1923                         len = 0;
1924                 }
1925
1926                 *ppos += *lenp;
1927                 p = buffer;
1928                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1929                         if (get_user(c, p++))
1930                                 return -EFAULT;
1931                         if (c == 0 || c == '\n')
1932                                 break;
1933                         data[len++] = c;
1934                 }
1935                 data[len] = 0;
1936         } else {
1937                 len = strlen(data);
1938                 if (len > maxlen)
1939                         len = maxlen;
1940
1941                 if (*ppos > len) {
1942                         *lenp = 0;
1943                         return 0;
1944                 }
1945
1946                 data += *ppos;
1947                 len  -= *ppos;
1948
1949                 if (len > *lenp)
1950                         len = *lenp;
1951                 if (len)
1952                         if (copy_to_user(buffer, data, len))
1953                                 return -EFAULT;
1954                 if (len < *lenp) {
1955                         if (put_user('\n', buffer + len))
1956                                 return -EFAULT;
1957                         len++;
1958                 }
1959                 *lenp = len;
1960                 *ppos += len;
1961         }
1962         return 0;
1963 }
1964
1965 static void warn_sysctl_write(struct ctl_table *table)
1966 {
1967         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1968                 "This will not be supported in the future. To silence this\n"
1969                 "warning, set kernel.sysctl_writes_strict = -1\n",
1970                 current->comm, table->procname);
1971 }
1972
1973 /**
1974  * proc_dostring - read a string sysctl
1975  * @table: the sysctl table
1976  * @write: %TRUE if this is a write to the sysctl file
1977  * @buffer: the user buffer
1978  * @lenp: the size of the user buffer
1979  * @ppos: file position
1980  *
1981  * Reads/writes a string from/to the user buffer. If the kernel
1982  * buffer provided is not large enough to hold the string, the
1983  * string is truncated. The copied string is %NULL-terminated.
1984  * If the string is being read by the user process, it is copied
1985  * and a newline '\n' is added. It is truncated if the buffer is
1986  * not large enough.
1987  *
1988  * Returns 0 on success.
1989  */
1990 int proc_dostring(struct ctl_table *table, int write,
1991                   void __user *buffer, size_t *lenp, loff_t *ppos)
1992 {
1993         if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1994                 warn_sysctl_write(table);
1995
1996         return _proc_do_string((char *)(table->data), table->maxlen, write,
1997                                (char __user *)buffer, lenp, ppos);
1998 }
1999
2000 static size_t proc_skip_spaces(char **buf)
2001 {
2002         size_t ret;
2003         char *tmp = skip_spaces(*buf);
2004         ret = tmp - *buf;
2005         *buf = tmp;
2006         return ret;
2007 }
2008
2009 static void proc_skip_char(char **buf, size_t *size, const char v)
2010 {
2011         while (*size) {
2012                 if (**buf != v)
2013                         break;
2014                 (*size)--;
2015                 (*buf)++;
2016         }
2017 }
2018
2019 #define TMPBUFLEN 22
2020 /**
2021  * proc_get_long - reads an ASCII formatted integer from a user buffer
2022  *
2023  * @buf: a kernel buffer
2024  * @size: size of the kernel buffer
2025  * @val: this is where the number will be stored
2026  * @neg: set to %TRUE if number is negative
2027  * @perm_tr: a vector which contains the allowed trailers
2028  * @perm_tr_len: size of the perm_tr vector
2029  * @tr: pointer to store the trailer character
2030  *
2031  * In case of success %0 is returned and @buf and @size are updated with
2032  * the amount of bytes read. If @tr is non-NULL and a trailing
2033  * character exists (size is non-zero after returning from this
2034  * function), @tr is updated with the trailing character.
2035  */
2036 static int proc_get_long(char **buf, size_t *size,
2037                           unsigned long *val, bool *neg,
2038                           const char *perm_tr, unsigned perm_tr_len, char *tr)
2039 {
2040         int len;
2041         char *p, tmp[TMPBUFLEN];
2042
2043         if (!*size)
2044                 return -EINVAL;
2045
2046         len = *size;
2047         if (len > TMPBUFLEN - 1)
2048                 len = TMPBUFLEN - 1;
2049
2050         memcpy(tmp, *buf, len);
2051
2052         tmp[len] = 0;
2053         p = tmp;
2054         if (*p == '-' && *size > 1) {
2055                 *neg = true;
2056                 p++;
2057         } else
2058                 *neg = false;
2059         if (!isdigit(*p))
2060                 return -EINVAL;
2061
2062         *val = simple_strtoul(p, &p, 0);
2063
2064         len = p - tmp;
2065
2066         /* We don't know if the next char is whitespace thus we may accept
2067          * invalid integers (e.g. 1234...a) or two integers instead of one
2068          * (e.g. 123...1). So lets not allow such large numbers. */
2069         if (len == TMPBUFLEN - 1)
2070                 return -EINVAL;
2071
2072         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2073                 return -EINVAL;
2074
2075         if (tr && (len < *size))
2076                 *tr = *p;
2077
2078         *buf += len;
2079         *size -= len;
2080
2081         return 0;
2082 }
2083
2084 /**
2085  * proc_put_long - converts an integer to a decimal ASCII formatted string
2086  *
2087  * @buf: the user buffer
2088  * @size: the size of the user buffer
2089  * @val: the integer to be converted
2090  * @neg: sign of the number, %TRUE for negative
2091  *
2092  * In case of success %0 is returned and @buf and @size are updated with
2093  * the amount of bytes written.
2094  */
2095 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2096                           bool neg)
2097 {
2098         int len;
2099         char tmp[TMPBUFLEN], *p = tmp;
2100
2101         sprintf(p, "%s%lu", neg ? "-" : "", val);
2102         len = strlen(tmp);
2103         if (len > *size)
2104                 len = *size;
2105         if (copy_to_user(*buf, tmp, len))
2106                 return -EFAULT;
2107         *size -= len;
2108         *buf += len;
2109         return 0;
2110 }
2111 #undef TMPBUFLEN
2112
2113 static int proc_put_char(void __user **buf, size_t *size, char c)
2114 {
2115         if (*size) {
2116                 char __user **buffer = (char __user **)buf;
2117                 if (put_user(c, *buffer))
2118                         return -EFAULT;
2119                 (*size)--, (*buffer)++;
2120                 *buf = *buffer;
2121         }
2122         return 0;
2123 }
2124
2125 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2126                                  int *valp,
2127                                  int write, void *data)
2128 {
2129         if (write) {
2130                 if (*negp) {
2131                         if (*lvalp > (unsigned long) INT_MAX + 1)
2132                                 return -EINVAL;
2133                         *valp = -*lvalp;
2134                 } else {
2135                         if (*lvalp > (unsigned long) INT_MAX)
2136                                 return -EINVAL;
2137                         *valp = *lvalp;
2138                 }
2139         } else {
2140                 int val = *valp;
2141                 if (val < 0) {
2142                         *negp = true;
2143                         *lvalp = -(unsigned long)val;
2144                 } else {
2145                         *negp = false;
2146                         *lvalp = (unsigned long)val;
2147                 }
2148         }
2149         return 0;
2150 }
2151
2152 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2153                                  int *valp,
2154                                  int write, void *data)
2155 {
2156         if (write) {
2157                 if (*negp)
2158                         return -EINVAL;
2159                 *valp = *lvalp;
2160         } else {
2161                 unsigned int val = *valp;
2162                 *lvalp = (unsigned long)val;
2163         }
2164         return 0;
2165 }
2166
2167 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2168
2169 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2170                   int write, void __user *buffer,
2171                   size_t *lenp, loff_t *ppos,
2172                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2173                               int write, void *data),
2174                   void *data)
2175 {
2176         int *i, vleft, first = 1, err = 0;
2177         size_t left;
2178         char *kbuf = NULL, *p;
2179
2180         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2181                 *lenp = 0;
2182                 return 0;
2183         }
2184
2185         i = (int *) tbl_data;
2186         vleft = table->maxlen / sizeof(*i);
2187         left = *lenp;
2188
2189         if (!conv)
2190                 conv = do_proc_dointvec_conv;
2191
2192         if (write) {
2193                 if (*ppos) {
2194                         switch (sysctl_writes_strict) {
2195                         case SYSCTL_WRITES_STRICT:
2196                                 goto out;
2197                         case SYSCTL_WRITES_WARN:
2198                                 warn_sysctl_write(table);
2199                                 break;
2200                         default:
2201                                 break;
2202                         }
2203                 }
2204
2205                 if (left > PAGE_SIZE - 1)
2206                         left = PAGE_SIZE - 1;
2207                 p = kbuf = memdup_user_nul(buffer, left);
2208                 if (IS_ERR(kbuf))
2209                         return PTR_ERR(kbuf);
2210         }
2211
2212         for (; left && vleft--; i++, first=0) {
2213                 unsigned long lval;
2214                 bool neg;
2215
2216                 if (write) {
2217                         left -= proc_skip_spaces(&p);
2218
2219                         if (!left)
2220                                 break;
2221                         err = proc_get_long(&p, &left, &lval, &neg,
2222                                              proc_wspace_sep,
2223                                              sizeof(proc_wspace_sep), NULL);
2224                         if (err)
2225                                 break;
2226                         if (conv(&neg, &lval, i, 1, data)) {
2227                                 err = -EINVAL;
2228                                 break;
2229                         }
2230                 } else {
2231                         if (conv(&neg, &lval, i, 0, data)) {
2232                                 err = -EINVAL;
2233                                 break;
2234                         }
2235                         if (!first)
2236                                 err = proc_put_char(&buffer, &left, '\t');
2237                         if (err)
2238                                 break;
2239                         err = proc_put_long(&buffer, &left, lval, neg);
2240                         if (err)
2241                                 break;
2242                 }
2243         }
2244
2245         if (!write && !first && left && !err)
2246                 err = proc_put_char(&buffer, &left, '\n');
2247         if (write && !err && left)
2248                 left -= proc_skip_spaces(&p);
2249         if (write) {
2250                 kfree(kbuf);
2251                 if (first)
2252                         return err ? : -EINVAL;
2253         }
2254         *lenp -= left;
2255 out:
2256         *ppos += *lenp;
2257         return err;
2258 }
2259
2260 static int do_proc_dointvec(struct ctl_table *table, int write,
2261                   void __user *buffer, size_t *lenp, loff_t *ppos,
2262                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2263                               int write, void *data),
2264                   void *data)
2265 {
2266         return __do_proc_dointvec(table->data, table, write,
2267                         buffer, lenp, ppos, conv, data);
2268 }
2269
2270 /**
2271  * proc_dointvec - read a vector of integers
2272  * @table: the sysctl table
2273  * @write: %TRUE if this is a write to the sysctl file
2274  * @buffer: the user buffer
2275  * @lenp: the size of the user buffer
2276  * @ppos: file position
2277  *
2278  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2279  * values from/to the user buffer, treated as an ASCII string.
2280  *
2281  * Returns 0 on success.
2282  */
2283 int proc_dointvec(struct ctl_table *table, int write,
2284                      void __user *buffer, size_t *lenp, loff_t *ppos)
2285 {
2286         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2287 }
2288
2289 /**
2290  * proc_douintvec - read a vector of unsigned integers
2291  * @table: the sysctl table
2292  * @write: %TRUE if this is a write to the sysctl file
2293  * @buffer: the user buffer
2294  * @lenp: the size of the user buffer
2295  * @ppos: file position
2296  *
2297  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2298  * values from/to the user buffer, treated as an ASCII string.
2299  *
2300  * Returns 0 on success.
2301  */
2302 int proc_douintvec(struct ctl_table *table, int write,
2303                      void __user *buffer, size_t *lenp, loff_t *ppos)
2304 {
2305         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2306                                 do_proc_douintvec_conv, NULL);
2307 }
2308
2309 /*
2310  * Taint values can only be increased
2311  * This means we can safely use a temporary.
2312  */
2313 static int proc_taint(struct ctl_table *table, int write,
2314                                void __user *buffer, size_t *lenp, loff_t *ppos)
2315 {
2316         struct ctl_table t;
2317         unsigned long tmptaint = get_taint();
2318         int err;
2319
2320         if (write && !capable(CAP_SYS_ADMIN))
2321                 return -EPERM;
2322
2323         t = *table;
2324         t.data = &tmptaint;
2325         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2326         if (err < 0)
2327                 return err;
2328
2329         if (write) {
2330                 /*
2331                  * Poor man's atomic or. Not worth adding a primitive
2332                  * to everyone's atomic.h for this
2333                  */
2334                 int i;
2335                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2336                         if ((tmptaint >> i) & 1)
2337                                 add_taint(i, LOCKDEP_STILL_OK);
2338                 }
2339         }
2340
2341         return err;
2342 }
2343
2344 #ifdef CONFIG_PRINTK
2345 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2346                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2347 {
2348         if (write && !capable(CAP_SYS_ADMIN))
2349                 return -EPERM;
2350
2351         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2352 }
2353 #endif
2354
2355 struct do_proc_dointvec_minmax_conv_param {
2356         int *min;
2357         int *max;
2358 };
2359
2360 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2361                                         int *valp,
2362                                         int write, void *data)
2363 {
2364         struct do_proc_dointvec_minmax_conv_param *param = data;
2365         if (write) {
2366                 int val = *negp ? -*lvalp : *lvalp;
2367                 if ((param->min && *param->min > val) ||
2368                     (param->max && *param->max < val))
2369                         return -EINVAL;
2370                 *valp = val;
2371         } else {
2372                 int val = *valp;
2373                 if (val < 0) {
2374                         *negp = true;
2375                         *lvalp = -(unsigned long)val;
2376                 } else {
2377                         *negp = false;
2378                         *lvalp = (unsigned long)val;
2379                 }
2380         }
2381         return 0;
2382 }
2383
2384 /**
2385  * proc_dointvec_minmax - read a vector of integers with min/max values
2386  * @table: the sysctl table
2387  * @write: %TRUE if this is a write to the sysctl file
2388  * @buffer: the user buffer
2389  * @lenp: the size of the user buffer
2390  * @ppos: file position
2391  *
2392  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2393  * values from/to the user buffer, treated as an ASCII string.
2394  *
2395  * This routine will ensure the values are within the range specified by
2396  * table->extra1 (min) and table->extra2 (max).
2397  *
2398  * Returns 0 on success.
2399  */
2400 int proc_dointvec_minmax(struct ctl_table *table, int write,
2401                   void __user *buffer, size_t *lenp, loff_t *ppos)
2402 {
2403         struct do_proc_dointvec_minmax_conv_param param = {
2404                 .min = (int *) table->extra1,
2405                 .max = (int *) table->extra2,
2406         };
2407         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2408                                 do_proc_dointvec_minmax_conv, &param);
2409 }
2410
2411 static void validate_coredump_safety(void)
2412 {
2413 #ifdef CONFIG_COREDUMP
2414         if (suid_dumpable == SUID_DUMP_ROOT &&
2415             core_pattern[0] != '/' && core_pattern[0] != '|') {
2416                 printk(KERN_WARNING "Unsafe core_pattern used with "\
2417                         "suid_dumpable=2. Pipe handler or fully qualified "\
2418                         "core dump path required.\n");
2419         }
2420 #endif
2421 }
2422
2423 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2424                 void __user *buffer, size_t *lenp, loff_t *ppos)
2425 {
2426         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2427         if (!error)
2428                 validate_coredump_safety();
2429         return error;
2430 }
2431
2432 #ifdef CONFIG_COREDUMP
2433 static int proc_dostring_coredump(struct ctl_table *table, int write,
2434                   void __user *buffer, size_t *lenp, loff_t *ppos)
2435 {
2436         int error = proc_dostring(table, write, buffer, lenp, ppos);
2437         if (!error)
2438                 validate_coredump_safety();
2439         return error;
2440 }
2441 #endif
2442
2443 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2444                                      void __user *buffer,
2445                                      size_t *lenp, loff_t *ppos,
2446                                      unsigned long convmul,
2447                                      unsigned long convdiv)
2448 {
2449         unsigned long *i, *min, *max;
2450         int vleft, first = 1, err = 0;
2451         size_t left;
2452         char *kbuf = NULL, *p;
2453
2454         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2455                 *lenp = 0;
2456                 return 0;
2457         }
2458
2459         i = (unsigned long *) data;
2460         min = (unsigned long *) table->extra1;
2461         max = (unsigned long *) table->extra2;
2462         vleft = table->maxlen / sizeof(unsigned long);
2463         left = *lenp;
2464
2465         if (write) {
2466                 if (*ppos) {
2467                         switch (sysctl_writes_strict) {
2468                         case SYSCTL_WRITES_STRICT:
2469                                 goto out;
2470                         case SYSCTL_WRITES_WARN:
2471                                 warn_sysctl_write(table);
2472                                 break;
2473                         default:
2474                                 break;
2475                         }
2476                 }
2477
2478                 if (left > PAGE_SIZE - 1)
2479                         left = PAGE_SIZE - 1;
2480                 p = kbuf = memdup_user_nul(buffer, left);
2481                 if (IS_ERR(kbuf))
2482                         return PTR_ERR(kbuf);
2483         }
2484
2485         for (; left && vleft--; i++, first = 0) {
2486                 unsigned long val;
2487
2488                 if (write) {
2489                         bool neg;
2490
2491                         left -= proc_skip_spaces(&p);
2492
2493                         err = proc_get_long(&p, &left, &val, &neg,
2494                                              proc_wspace_sep,
2495                                              sizeof(proc_wspace_sep), NULL);
2496                         if (err)
2497                                 break;
2498                         if (neg)
2499                                 continue;
2500                         if ((min && val < *min) || (max && val > *max))
2501                                 continue;
2502                         *i = val;
2503                 } else {
2504                         val = convdiv * (*i) / convmul;
2505                         if (!first) {
2506                                 err = proc_put_char(&buffer, &left, '\t');
2507                                 if (err)
2508                                         break;
2509                         }
2510                         err = proc_put_long(&buffer, &left, val, false);
2511                         if (err)
2512                                 break;
2513                 }
2514         }
2515
2516         if (!write && !first && left && !err)
2517                 err = proc_put_char(&buffer, &left, '\n');
2518         if (write && !err)
2519                 left -= proc_skip_spaces(&p);
2520         if (write) {
2521                 kfree(kbuf);
2522                 if (first)
2523                         return err ? : -EINVAL;
2524         }
2525         *lenp -= left;
2526 out:
2527         *ppos += *lenp;
2528         return err;
2529 }
2530
2531 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2532                                      void __user *buffer,
2533                                      size_t *lenp, loff_t *ppos,
2534                                      unsigned long convmul,
2535                                      unsigned long convdiv)
2536 {
2537         return __do_proc_doulongvec_minmax(table->data, table, write,
2538                         buffer, lenp, ppos, convmul, convdiv);
2539 }
2540
2541 /**
2542  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2543  * @table: the sysctl table
2544  * @write: %TRUE if this is a write to the sysctl file
2545  * @buffer: the user buffer
2546  * @lenp: the size of the user buffer
2547  * @ppos: file position
2548  *
2549  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2550  * values from/to the user buffer, treated as an ASCII string.
2551  *
2552  * This routine will ensure the values are within the range specified by
2553  * table->extra1 (min) and table->extra2 (max).
2554  *
2555  * Returns 0 on success.
2556  */
2557 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2558                            void __user *buffer, size_t *lenp, loff_t *ppos)
2559 {
2560     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2561 }
2562
2563 /**
2564  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2565  * @table: the sysctl table
2566  * @write: %TRUE if this is a write to the sysctl file
2567  * @buffer: the user buffer
2568  * @lenp: the size of the user buffer
2569  * @ppos: file position
2570  *
2571  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2572  * values from/to the user buffer, treated as an ASCII string. The values
2573  * are treated as milliseconds, and converted to jiffies when they are stored.
2574  *
2575  * This routine will ensure the values are within the range specified by
2576  * table->extra1 (min) and table->extra2 (max).
2577  *
2578  * Returns 0 on success.
2579  */
2580 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2581                                       void __user *buffer,
2582                                       size_t *lenp, loff_t *ppos)
2583 {
2584     return do_proc_doulongvec_minmax(table, write, buffer,
2585                                      lenp, ppos, HZ, 1000l);
2586 }
2587
2588
2589 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2590                                          int *valp,
2591                                          int write, void *data)
2592 {
2593         if (write) {
2594                 if (*lvalp > LONG_MAX / HZ)
2595                         return 1;
2596                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2597         } else {
2598                 int val = *valp;
2599                 unsigned long lval;
2600                 if (val < 0) {
2601                         *negp = true;
2602                         lval = -(unsigned long)val;
2603                 } else {
2604                         *negp = false;
2605                         lval = (unsigned long)val;
2606                 }
2607                 *lvalp = lval / HZ;
2608         }
2609         return 0;
2610 }
2611
2612 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2613                                                 int *valp,
2614                                                 int write, void *data)
2615 {
2616         if (write) {
2617                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2618                         return 1;
2619                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2620         } else {
2621                 int val = *valp;
2622                 unsigned long lval;
2623                 if (val < 0) {
2624                         *negp = true;
2625                         lval = -(unsigned long)val;
2626                 } else {
2627                         *negp = false;
2628                         lval = (unsigned long)val;
2629                 }
2630                 *lvalp = jiffies_to_clock_t(lval);
2631         }
2632         return 0;
2633 }
2634
2635 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2636                                             int *valp,
2637                                             int write, void *data)
2638 {
2639         if (write) {
2640                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2641
2642                 if (jif > INT_MAX)
2643                         return 1;
2644                 *valp = (int)jif;
2645         } else {
2646                 int val = *valp;
2647                 unsigned long lval;
2648                 if (val < 0) {
2649                         *negp = true;
2650                         lval = -(unsigned long)val;
2651                 } else {
2652                         *negp = false;
2653                         lval = (unsigned long)val;
2654                 }
2655                 *lvalp = jiffies_to_msecs(lval);
2656         }
2657         return 0;
2658 }
2659
2660 /**
2661  * proc_dointvec_jiffies - read a vector of integers as seconds
2662  * @table: the sysctl table
2663  * @write: %TRUE if this is a write to the sysctl file
2664  * @buffer: the user buffer
2665  * @lenp: the size of the user buffer
2666  * @ppos: file position
2667  *
2668  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2669  * values from/to the user buffer, treated as an ASCII string.
2670  * The values read are assumed to be in seconds, and are converted into
2671  * jiffies.
2672  *
2673  * Returns 0 on success.
2674  */
2675 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2676                           void __user *buffer, size_t *lenp, loff_t *ppos)
2677 {
2678     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2679                             do_proc_dointvec_jiffies_conv,NULL);
2680 }
2681
2682 /**
2683  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2684  * @table: the sysctl table
2685  * @write: %TRUE if this is a write to the sysctl file
2686  * @buffer: the user buffer
2687  * @lenp: the size of the user buffer
2688  * @ppos: pointer to the file position
2689  *
2690  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2691  * values from/to the user buffer, treated as an ASCII string.
2692  * The values read are assumed to be in 1/USER_HZ seconds, and
2693  * are converted into jiffies.
2694  *
2695  * Returns 0 on success.
2696  */
2697 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2698                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2699 {
2700     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2701                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2702 }
2703
2704 /**
2705  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2706  * @table: the sysctl table
2707  * @write: %TRUE if this is a write to the sysctl file
2708  * @buffer: the user buffer
2709  * @lenp: the size of the user buffer
2710  * @ppos: file position
2711  * @ppos: the current position in the file
2712  *
2713  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2714  * values from/to the user buffer, treated as an ASCII string.
2715  * The values read are assumed to be in 1/1000 seconds, and
2716  * are converted into jiffies.
2717  *
2718  * Returns 0 on success.
2719  */
2720 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2721                              void __user *buffer, size_t *lenp, loff_t *ppos)
2722 {
2723         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2724                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2725 }
2726
2727 static int proc_do_cad_pid(struct ctl_table *table, int write,
2728                            void __user *buffer, size_t *lenp, loff_t *ppos)
2729 {
2730         struct pid *new_pid;
2731         pid_t tmp;
2732         int r;
2733
2734         tmp = pid_vnr(cad_pid);
2735
2736         r = __do_proc_dointvec(&tmp, table, write, buffer,
2737                                lenp, ppos, NULL, NULL);
2738         if (r || !write)
2739                 return r;
2740
2741         new_pid = find_get_pid(tmp);
2742         if (!new_pid)
2743                 return -ESRCH;
2744
2745         put_pid(xchg(&cad_pid, new_pid));
2746         return 0;
2747 }
2748
2749 /**
2750  * proc_do_large_bitmap - read/write from/to a large bitmap
2751  * @table: the sysctl table
2752  * @write: %TRUE if this is a write to the sysctl file
2753  * @buffer: the user buffer
2754  * @lenp: the size of the user buffer
2755  * @ppos: file position
2756  *
2757  * The bitmap is stored at table->data and the bitmap length (in bits)
2758  * in table->maxlen.
2759  *
2760  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2761  * large bitmaps may be represented in a compact manner. Writing into
2762  * the file will clear the bitmap then update it with the given input.
2763  *
2764  * Returns 0 on success.
2765  */
2766 int proc_do_large_bitmap(struct ctl_table *table, int write,
2767                          void __user *buffer, size_t *lenp, loff_t *ppos)
2768 {
2769         int err = 0;
2770         bool first = 1;
2771         size_t left = *lenp;
2772         unsigned long bitmap_len = table->maxlen;
2773         unsigned long *bitmap = *(unsigned long **) table->data;
2774         unsigned long *tmp_bitmap = NULL;
2775         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2776
2777         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2778                 *lenp = 0;
2779                 return 0;
2780         }
2781
2782         if (write) {
2783                 char *kbuf, *p;
2784
2785                 if (left > PAGE_SIZE - 1)
2786                         left = PAGE_SIZE - 1;
2787
2788                 p = kbuf = memdup_user_nul(buffer, left);
2789                 if (IS_ERR(kbuf))
2790                         return PTR_ERR(kbuf);
2791
2792                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2793                                      GFP_KERNEL);
2794                 if (!tmp_bitmap) {
2795                         kfree(kbuf);
2796                         return -ENOMEM;
2797                 }
2798                 proc_skip_char(&p, &left, '\n');
2799                 while (!err && left) {
2800                         unsigned long val_a, val_b;
2801                         bool neg;
2802
2803                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2804                                              sizeof(tr_a), &c);
2805                         if (err)
2806                                 break;
2807                         if (val_a >= bitmap_len || neg) {
2808                                 err = -EINVAL;
2809                                 break;
2810                         }
2811
2812                         val_b = val_a;
2813                         if (left) {
2814                                 p++;
2815                                 left--;
2816                         }
2817
2818                         if (c == '-') {
2819                                 err = proc_get_long(&p, &left, &val_b,
2820                                                      &neg, tr_b, sizeof(tr_b),
2821                                                      &c);
2822                                 if (err)
2823                                         break;
2824                                 if (val_b >= bitmap_len || neg ||
2825                                     val_a > val_b) {
2826                                         err = -EINVAL;
2827                                         break;
2828                                 }
2829                                 if (left) {
2830                                         p++;
2831                                         left--;
2832                                 }
2833                         }
2834
2835                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2836                         first = 0;
2837                         proc_skip_char(&p, &left, '\n');
2838                 }
2839                 kfree(kbuf);
2840         } else {
2841                 unsigned long bit_a, bit_b = 0;
2842
2843                 while (left) {
2844                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2845                         if (bit_a >= bitmap_len)
2846                                 break;
2847                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
2848                                                    bit_a + 1) - 1;
2849
2850                         if (!first) {
2851                                 err = proc_put_char(&buffer, &left, ',');
2852                                 if (err)
2853                                         break;
2854                         }
2855                         err = proc_put_long(&buffer, &left, bit_a, false);
2856                         if (err)
2857                                 break;
2858                         if (bit_a != bit_b) {
2859                                 err = proc_put_char(&buffer, &left, '-');
2860                                 if (err)
2861                                         break;
2862                                 err = proc_put_long(&buffer, &left, bit_b, false);
2863                                 if (err)
2864                                         break;
2865                         }
2866
2867                         first = 0; bit_b++;
2868                 }
2869                 if (!err)
2870                         err = proc_put_char(&buffer, &left, '\n');
2871         }
2872
2873         if (!err) {
2874                 if (write) {
2875                         if (*ppos)
2876                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2877                         else
2878                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2879                 }
2880                 kfree(tmp_bitmap);
2881                 *lenp -= left;
2882                 *ppos += *lenp;
2883                 return 0;
2884         } else {
2885                 kfree(tmp_bitmap);
2886                 return err;
2887         }
2888 }
2889
2890 #else /* CONFIG_PROC_SYSCTL */
2891
2892 int proc_dostring(struct ctl_table *table, int write,
2893                   void __user *buffer, size_t *lenp, loff_t *ppos)
2894 {
2895         return -ENOSYS;
2896 }
2897
2898 int proc_dointvec(struct ctl_table *table, int write,
2899                   void __user *buffer, size_t *lenp, loff_t *ppos)
2900 {
2901         return -ENOSYS;
2902 }
2903
2904 int proc_douintvec(struct ctl_table *table, int write,
2905                   void __user *buffer, size_t *lenp, loff_t *ppos)
2906 {
2907         return -ENOSYS;
2908 }
2909
2910 int proc_dointvec_minmax(struct ctl_table *table, int write,
2911                     void __user *buffer, size_t *lenp, loff_t *ppos)
2912 {
2913         return -ENOSYS;
2914 }
2915
2916 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2917                     void __user *buffer, size_t *lenp, loff_t *ppos)
2918 {
2919         return -ENOSYS;
2920 }
2921
2922 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2923                     void __user *buffer, size_t *lenp, loff_t *ppos)
2924 {
2925         return -ENOSYS;
2926 }
2927
2928 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2929                              void __user *buffer, size_t *lenp, loff_t *ppos)
2930 {
2931         return -ENOSYS;
2932 }
2933
2934 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2935                     void __user *buffer, size_t *lenp, loff_t *ppos)
2936 {
2937         return -ENOSYS;
2938 }
2939
2940 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2941                                       void __user *buffer,
2942                                       size_t *lenp, loff_t *ppos)
2943 {
2944     return -ENOSYS;
2945 }
2946
2947
2948 #endif /* CONFIG_PROC_SYSCTL */
2949
2950 /*
2951  * No sense putting this after each symbol definition, twice,
2952  * exception granted :-)
2953  */
2954 EXPORT_SYMBOL(proc_dointvec);
2955 EXPORT_SYMBOL(proc_douintvec);
2956 EXPORT_SYMBOL(proc_dointvec_jiffies);
2957 EXPORT_SYMBOL(proc_dointvec_minmax);
2958 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2959 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2960 EXPORT_SYMBOL(proc_dostring);
2961 EXPORT_SYMBOL(proc_doulongvec_minmax);
2962 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);