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/kmemleak.h>
  34 #include <linux/fs.h>
  35 #include <linux/init.h>
  36 #include <linux/kernel.h>
  37 #include <linux/kobject.h>
  38 #include <linux/net.h>
  39 #include <linux/sysrq.h>
  40 #include <linux/highuid.h>
  41 #include <linux/writeback.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/compaction.h>
  44 #include <linux/hugetlb.h>
  45 #include <linux/initrd.h>
  46 #include <linux/key.h>
  47 #include <linux/times.h>
  48 #include <linux/limits.h>
  49 #include <linux/dcache.h>
  50 #include <linux/dnotify.h>
  51 #include <linux/syscalls.h>
  52 #include <linux/vmstat.h>
  53 #include <linux/nfs_fs.h>
  54 #include <linux/acpi.h>
  55 #include <linux/reboot.h>
  56 #include <linux/ftrace.h>
  57 #include <linux/perf_event.h>
  58 #include <linux/kprobes.h>
  59 #include <linux/pipe_fs_i.h>
  60 #include <linux/oom.h>
  61 #include <linux/kmod.h>
  62 #include <linux/capability.h>
  63 #include <linux/binfmts.h>
  64 #include <linux/sched/sysctl.h>
  65 #include <linux/sched/coredump.h>
  66 #include <linux/kexec.h>
  67 #include <linux/bpf.h>
  68 #include <linux/mount.h>
  69 #include <linux/pipe_fs_i.h>
  70
  71 #include <linux/uaccess.h>
  72 #include <asm/processor.h>
  73
  74 #ifdef CONFIG_X86
  75 #include <asm/nmi.h>
  76 #include <asm/stacktrace.h>
  77 #include <asm/io.h>
  78 #endif
  79 #ifdef CONFIG_SPARC
  80 #include <asm/setup.h>
  81 #endif
  82 #ifdef CONFIG_BSD_PROCESS_ACCT
  83 #include <linux/acct.h>
  84 #endif
  85 #ifdef CONFIG_RT_MUTEXES
  86 #include <linux/rtmutex.h>
  87 #endif
  88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  89 #include <linux/lockdep.h>
  90 #endif
  91 #ifdef CONFIG_CHR_DEV_SG
  92 #include <scsi/sg.h>
  93 #endif
  94
  95 #ifdef CONFIG_LOCKUP_DETECTOR
  96 #include <linux/nmi.h>
  97 #endif
  98
  99 #if defined(CONFIG_SYSCTL)
 100
 101 /* External variables not in a header file. */
 102 extern int suid_dumpable;
 103 #ifdef CONFIG_COREDUMP
 104 extern int core_uses_pid;
 105 extern char core_pattern[];
 106 extern unsigned int core_pipe_limit;
 107 #endif
 108 extern int pid_max;
 109 extern int pid_max_min, pid_max_max;
 110 extern int percpu_pagelist_fraction;
 111 extern int latencytop_enabled;
 112 extern unsigned 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 /**
 178  * enum sysctl_writes_mode - supported sysctl write modes
 179  *
 180  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
 181  *      to be written, and multiple writes on the same sysctl file descriptor
 182  *      will rewrite the sysctl value, regardless of file position. No warning
 183  *      is issued when the initial position is not 0.
 184  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
 185  *      not 0.
 186  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
 187  *      file position 0 and the value must be fully contained in the buffer
 188  *      sent to the write syscall. If dealing with strings respect the file
 189  *      position, but restrict this to the max length of the buffer, anything
 190  *      passed the max lenght will be ignored. Multiple writes will append
 191  *      to the buffer.
 192  *
 193  * These write modes control how current file position affects the behavior of
 194  * updating sysctl values through the proc interface on each write.
 195  */
 196 enum sysctl_writes_mode {
 197         SYSCTL_WRITES_LEGACY            = -1,
 198         SYSCTL_WRITES_WARN              = 0,
 199         SYSCTL_WRITES_STRICT            = 1,
 200 };
 201
 202 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 203
 204 static int proc_do_cad_pid(struct ctl_table *table, int write,
 205                   void __user *buffer, size_t *lenp, loff_t *ppos);
 206 static int proc_taint(struct ctl_table *table, int write,
 207                                void __user *buffer, size_t *lenp, loff_t *ppos);
 208 #endif
 209
 210 #ifdef CONFIG_PRINTK
 211 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 212                                 void __user *buffer, size_t *lenp, loff_t *ppos);
 213 #endif
 214
 215 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
 216                 void __user *buffer, size_t *lenp, loff_t *ppos);
 217 #ifdef CONFIG_COREDUMP
 218 static int proc_dostring_coredump(struct ctl_table *table, int write,
 219                 void __user *buffer, size_t *lenp, loff_t *ppos);
 220 #endif
 221
 222 #ifdef CONFIG_MAGIC_SYSRQ
 223 /* Note: sysrq code uses it's own private copy */
 224 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 225
 226 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 227                                 void __user *buffer, size_t *lenp,
 228                                 loff_t *ppos)
 229 {
 230         int error;
 231
 232         error = proc_dointvec(table, write, buffer, lenp, ppos);
 233         if (error)
 234                 return error;
 235
 236         if (write)
 237                 sysrq_toggle_support(__sysrq_enabled);
 238
 239         return 0;
 240 }
 241
 242 #endif
 243
 244 static struct ctl_table kern_table[];
 245 static struct ctl_table vm_table[];
 246 static struct ctl_table fs_table[];
 247 static struct ctl_table debug_table[];
 248 static struct ctl_table dev_table[];
 249 extern struct ctl_table random_table[];
 250 #ifdef CONFIG_EPOLL
 251 extern struct ctl_table epoll_table[];
 252 #endif
 253
 254 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 255 int sysctl_legacy_va_layout;
 256 #endif
 257
 258 /* The default sysctl tables: */
 259
 260 static struct ctl_table sysctl_base_table[] = {
 261         {
 262                 .procname       = "kernel",
 263                 .mode           = 0555,
 264                 .child          = kern_table,
 265         },
 266         {
 267                 .procname       = "vm",
 268                 .mode           = 0555,
 269                 .child          = vm_table,
 270         },
 271         {
 272                 .procname       = "fs",
 273                 .mode           = 0555,
 274                 .child          = fs_table,
 275         },
 276         {
 277                 .procname       = "debug",
 278                 .mode           = 0555,
 279                 .child          = debug_table,
 280         },
 281         {
 282                 .procname       = "dev",
 283                 .mode           = 0555,
 284                 .child          = dev_table,
 285         },
 286         { }
 287 };
 288
 289 #ifdef CONFIG_SCHED_DEBUG
 290 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
 291 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
 292 static int min_wakeup_granularity_ns;                   /* 0 usecs */
 293 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
 294 #ifdef CONFIG_SMP
 295 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 296 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 297 #endif /* CONFIG_SMP */
 298 #endif /* CONFIG_SCHED_DEBUG */
 299
 300 #ifdef CONFIG_COMPACTION
 301 static int min_extfrag_threshold;
 302 static int max_extfrag_threshold = 1000;
 303 #endif
 304
 305 static struct ctl_table kern_table[] = {
 306         {
 307                 .procname       = "sched_child_runs_first",
 308                 .data           = &sysctl_sched_child_runs_first,
 309                 .maxlen         = sizeof(unsigned int),
 310                 .mode           = 0644,
 311                 .proc_handler   = proc_dointvec,
 312         },
 313 #ifdef CONFIG_SCHED_DEBUG
 314         {
 315                 .procname       = "sched_min_granularity_ns",
 316                 .data           = &sysctl_sched_min_granularity,
 317                 .maxlen         = sizeof(unsigned int),
 318                 .mode           = 0644,
 319                 .proc_handler   = sched_proc_update_handler,
 320                 .extra1         = &min_sched_granularity_ns,
 321                 .extra2         = &max_sched_granularity_ns,
 322         },
 323         {
 324                 .procname       = "sched_latency_ns",
 325                 .data           = &sysctl_sched_latency,
 326                 .maxlen         = sizeof(unsigned int),
 327                 .mode           = 0644,
 328                 .proc_handler   = sched_proc_update_handler,
 329                 .extra1         = &min_sched_granularity_ns,
 330                 .extra2         = &max_sched_granularity_ns,
 331         },
 332         {
 333                 .procname       = "sched_wakeup_granularity_ns",
 334                 .data           = &sysctl_sched_wakeup_granularity,
 335                 .maxlen         = sizeof(unsigned int),
 336                 .mode           = 0644,
 337                 .proc_handler   = sched_proc_update_handler,
 338                 .extra1         = &min_wakeup_granularity_ns,
 339                 .extra2         = &max_wakeup_granularity_ns,
 340         },
 341 #ifdef CONFIG_SMP
 342         {
 343                 .procname       = "sched_tunable_scaling",
 344                 .data           = &sysctl_sched_tunable_scaling,
 345                 .maxlen         = sizeof(enum sched_tunable_scaling),
 346                 .mode           = 0644,
 347                 .proc_handler   = sched_proc_update_handler,
 348                 .extra1         = &min_sched_tunable_scaling,
 349                 .extra2         = &max_sched_tunable_scaling,
 350         },
 351         {
 352                 .procname       = "sched_migration_cost_ns",
 353                 .data           = &sysctl_sched_migration_cost,
 354                 .maxlen         = sizeof(unsigned int),
 355                 .mode           = 0644,
 356                 .proc_handler   = proc_dointvec,
 357         },
 358         {
 359                 .procname       = "sched_nr_migrate",
 360                 .data           = &sysctl_sched_nr_migrate,
 361                 .maxlen         = sizeof(unsigned int),
 362                 .mode           = 0644,
 363                 .proc_handler   = proc_dointvec,
 364         },
 365         {
 366                 .procname       = "sched_time_avg_ms",
 367                 .data           = &sysctl_sched_time_avg,
 368                 .maxlen         = sizeof(unsigned int),
 369                 .mode           = 0644,
 370                 .proc_handler   = proc_dointvec_minmax,
 371                 .extra1         = &one,
 372         },
 373 #ifdef CONFIG_SCHEDSTATS
 374         {
 375                 .procname       = "sched_schedstats",
 376                 .data           = NULL,
 377                 .maxlen         = sizeof(unsigned int),
 378                 .mode           = 0644,
 379                 .proc_handler   = sysctl_schedstats,
 380                 .extra1         = &zero,
 381                 .extra2         = &one,
 382         },
 383 #endif /* CONFIG_SCHEDSTATS */
 384 #endif /* CONFIG_SMP */
 385 #ifdef CONFIG_NUMA_BALANCING
 386         {
 387                 .procname       = "numa_balancing_scan_delay_ms",
 388                 .data           = &sysctl_numa_balancing_scan_delay,
 389                 .maxlen         = sizeof(unsigned int),
 390                 .mode           = 0644,
 391                 .proc_handler   = proc_dointvec,
 392         },
 393         {
 394                 .procname       = "numa_balancing_scan_period_min_ms",
 395                 .data           = &sysctl_numa_balancing_scan_period_min,
 396                 .maxlen         = sizeof(unsigned int),
 397                 .mode           = 0644,
 398                 .proc_handler   = proc_dointvec,
 399         },
 400         {
 401                 .procname       = "numa_balancing_scan_period_max_ms",
 402                 .data           = &sysctl_numa_balancing_scan_period_max,
 403                 .maxlen         = sizeof(unsigned int),
 404                 .mode           = 0644,
 405                 .proc_handler   = proc_dointvec,
 406         },
 407         {
 408                 .procname       = "numa_balancing_scan_size_mb",
 409                 .data           = &sysctl_numa_balancing_scan_size,
 410                 .maxlen         = sizeof(unsigned int),
 411                 .mode           = 0644,
 412                 .proc_handler   = proc_dointvec_minmax,
 413                 .extra1         = &one,
 414         },
 415         {
 416                 .procname       = "numa_balancing",
 417                 .data           = NULL, /* filled in by handler */
 418                 .maxlen         = sizeof(unsigned int),
 419                 .mode           = 0644,
 420                 .proc_handler   = sysctl_numa_balancing,
 421                 .extra1         = &zero,
 422                 .extra2         = &one,
 423         },
 424 #endif /* CONFIG_NUMA_BALANCING */
 425 #endif /* CONFIG_SCHED_DEBUG */
 426         {
 427                 .procname       = "sched_rt_period_us",
 428                 .data           = &sysctl_sched_rt_period,
 429                 .maxlen         = sizeof(unsigned int),
 430                 .mode           = 0644,
 431                 .proc_handler   = sched_rt_handler,
 432         },
 433         {
 434                 .procname       = "sched_rt_runtime_us",
 435                 .data           = &sysctl_sched_rt_runtime,
 436                 .maxlen         = sizeof(int),
 437                 .mode           = 0644,
 438                 .proc_handler   = sched_rt_handler,
 439         },
 440         {
 441                 .procname       = "sched_rr_timeslice_ms",
 442                 .data           = &sysctl_sched_rr_timeslice,
 443                 .maxlen         = sizeof(int),
 444                 .mode           = 0644,
 445                 .proc_handler   = sched_rr_handler,
 446         },
 447 #ifdef CONFIG_SCHED_AUTOGROUP
 448         {
 449                 .procname       = "sched_autogroup_enabled",
 450                 .data           = &sysctl_sched_autogroup_enabled,
 451                 .maxlen         = sizeof(unsigned int),
 452                 .mode           = 0644,
 453                 .proc_handler   = proc_dointvec_minmax,
 454                 .extra1         = &zero,
 455                 .extra2         = &one,
 456         },
 457 #endif
 458 #ifdef CONFIG_CFS_BANDWIDTH
 459         {
 460                 .procname       = "sched_cfs_bandwidth_slice_us",
 461                 .data           = &sysctl_sched_cfs_bandwidth_slice,
 462                 .maxlen         = sizeof(unsigned int),
 463                 .mode           = 0644,
 464                 .proc_handler   = proc_dointvec_minmax,
 465                 .extra1         = &one,
 466         },
 467 #endif
 468 #ifdef CONFIG_PROVE_LOCKING
 469         {
 470                 .procname       = "prove_locking",
 471                 .data           = &prove_locking,
 472                 .maxlen         = sizeof(int),
 473                 .mode           = 0644,
 474                 .proc_handler   = proc_dointvec,
 475         },
 476 #endif
 477 #ifdef CONFIG_LOCK_STAT
 478         {
 479                 .procname       = "lock_stat",
 480                 .data           = &lock_stat,
 481                 .maxlen         = sizeof(int),
 482                 .mode           = 0644,
 483                 .proc_handler   = proc_dointvec,
 484         },
 485 #endif
 486         {
 487                 .procname       = "panic",
 488                 .data           = &panic_timeout,
 489                 .maxlen         = sizeof(int),
 490                 .mode           = 0644,
 491                 .proc_handler   = proc_dointvec,
 492         },
 493 #ifdef CONFIG_COREDUMP
 494         {
 495                 .procname       = "core_uses_pid",
 496                 .data           = &core_uses_pid,
 497                 .maxlen         = sizeof(int),
 498                 .mode           = 0644,
 499                 .proc_handler   = proc_dointvec,
 500         },
 501         {
 502                 .procname       = "core_pattern",
 503                 .data           = core_pattern,
 504                 .maxlen         = CORENAME_MAX_SIZE,
 505                 .mode           = 0644,
 506                 .proc_handler   = proc_dostring_coredump,
 507         },
 508         {
 509                 .procname       = "core_pipe_limit",
 510                 .data           = &core_pipe_limit,
 511                 .maxlen         = sizeof(unsigned int),
 512                 .mode           = 0644,
 513                 .proc_handler   = proc_dointvec,
 514         },
 515 #endif
 516 #ifdef CONFIG_PROC_SYSCTL
 517         {
 518                 .procname       = "tainted",
 519                 .maxlen         = sizeof(long),
 520                 .mode           = 0644,
 521                 .proc_handler   = proc_taint,
 522         },
 523         {
 524                 .procname       = "sysctl_writes_strict",
 525                 .data           = &sysctl_writes_strict,
 526                 .maxlen         = sizeof(int),
 527                 .mode           = 0644,
 528                 .proc_handler   = proc_dointvec_minmax,
 529                 .extra1         = &neg_one,
 530                 .extra2         = &one,
 531         },
 532 #endif
 533 #ifdef CONFIG_LATENCYTOP
 534         {
 535                 .procname       = "latencytop",
 536                 .data           = &latencytop_enabled,
 537                 .maxlen         = sizeof(int),
 538                 .mode           = 0644,
 539                 .proc_handler   = sysctl_latencytop,
 540         },
 541 #endif
 542 #ifdef CONFIG_BLK_DEV_INITRD
 543         {
 544                 .procname       = "real-root-dev",
 545                 .data           = &real_root_dev,
 546                 .maxlen         = sizeof(int),
 547                 .mode           = 0644,
 548                 .proc_handler   = proc_dointvec,
 549         },
 550 #endif
 551         {
 552                 .procname       = "print-fatal-signals",
 553                 .data           = &print_fatal_signals,
 554                 .maxlen         = sizeof(int),
 555                 .mode           = 0644,
 556                 .proc_handler   = proc_dointvec,
 557         },
 558 #ifdef CONFIG_SPARC
 559         {
 560                 .procname       = "reboot-cmd",
 561                 .data           = reboot_command,
 562                 .maxlen         = 256,
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_dostring,
 565         },
 566         {
 567                 .procname       = "stop-a",
 568                 .data           = &stop_a_enabled,
 569                 .maxlen         = sizeof (int),
 570                 .mode           = 0644,
 571                 .proc_handler   = proc_dointvec,
 572         },
 573         {
 574                 .procname       = "scons-poweroff",
 575                 .data           = &scons_pwroff,
 576                 .maxlen         = sizeof (int),
 577                 .mode           = 0644,
 578                 .proc_handler   = proc_dointvec,
 579         },
 580 #endif
 581 #ifdef CONFIG_SPARC64
 582         {
 583                 .procname       = "tsb-ratio",
 584                 .data           = &sysctl_tsb_ratio,
 585                 .maxlen         = sizeof (int),
 586                 .mode           = 0644,
 587                 .proc_handler   = proc_dointvec,
 588         },
 589 #endif
 590 #ifdef __hppa__
 591         {
 592                 .procname       = "soft-power",
 593                 .data           = &pwrsw_enabled,
 594                 .maxlen         = sizeof (int),
 595                 .mode           = 0644,
 596                 .proc_handler   = proc_dointvec,
 597         },
 598 #endif
 599 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
 600         {
 601                 .procname       = "unaligned-trap",
 602                 .data           = &unaligned_enabled,
 603                 .maxlen         = sizeof (int),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dointvec,
 606         },
 607 #endif
 608         {
 609                 .procname       = "ctrl-alt-del",
 610                 .data           = &C_A_D,
 611                 .maxlen         = sizeof(int),
 612                 .mode           = 0644,
 613                 .proc_handler   = proc_dointvec,
 614         },
 615 #ifdef CONFIG_FUNCTION_TRACER
 616         {
 617                 .procname       = "ftrace_enabled",
 618                 .data           = &ftrace_enabled,
 619                 .maxlen         = sizeof(int),
 620                 .mode           = 0644,
 621                 .proc_handler   = ftrace_enable_sysctl,
 622         },
 623 #endif
 624 #ifdef CONFIG_STACK_TRACER
 625         {
 626                 .procname       = "stack_tracer_enabled",
 627                 .data           = &stack_tracer_enabled,
 628                 .maxlen         = sizeof(int),
 629                 .mode           = 0644,
 630                 .proc_handler   = stack_trace_sysctl,
 631         },
 632 #endif
 633 #ifdef CONFIG_TRACING
 634         {
 635                 .procname       = "ftrace_dump_on_oops",
 636                 .data           = &ftrace_dump_on_oops,
 637                 .maxlen         = sizeof(int),
 638                 .mode           = 0644,
 639                 .proc_handler   = proc_dointvec,
 640         },
 641         {
 642                 .procname       = "traceoff_on_warning",
 643                 .data           = &__disable_trace_on_warning,
 644                 .maxlen         = sizeof(__disable_trace_on_warning),
 645                 .mode           = 0644,
 646                 .proc_handler   = proc_dointvec,
 647         },
 648         {
 649                 .procname       = "tracepoint_printk",
 650                 .data           = &tracepoint_printk,
 651                 .maxlen         = sizeof(tracepoint_printk),
 652                 .mode           = 0644,
 653                 .proc_handler   = tracepoint_printk_sysctl,
 654         },
 655 #endif
 656 #ifdef CONFIG_KEXEC_CORE
 657         {
 658                 .procname       = "kexec_load_disabled",
 659                 .data           = &kexec_load_disabled,
 660                 .maxlen         = sizeof(int),
 661                 .mode           = 0644,
 662                 /* only handle a transition from default "0" to "1" */
 663                 .proc_handler   = proc_dointvec_minmax,
 664                 .extra1         = &one,
 665                 .extra2         = &one,
 666         },
 667 #endif
 668 #ifdef CONFIG_MODULES
 669         {
 670                 .procname       = "modprobe",
 671                 .data           = &modprobe_path,
 672                 .maxlen         = KMOD_PATH_LEN,
 673                 .mode           = 0644,
 674                 .proc_handler   = proc_dostring,
 675         },
 676         {
 677                 .procname       = "modules_disabled",
 678                 .data           = &modules_disabled,
 679                 .maxlen         = sizeof(int),
 680                 .mode           = 0644,
 681                 /* only handle a transition from default "0" to "1" */
 682                 .proc_handler   = proc_dointvec_minmax,
 683                 .extra1         = &one,
 684                 .extra2         = &one,
 685         },
 686 #endif
 687 #ifdef CONFIG_UEVENT_HELPER
 688         {
 689                 .procname       = "hotplug",
 690                 .data           = &uevent_helper,
 691                 .maxlen         = UEVENT_HELPER_PATH_LEN,
 692                 .mode           = 0644,
 693                 .proc_handler   = proc_dostring,
 694         },
 695 #endif
 696 #ifdef CONFIG_CHR_DEV_SG
 697         {
 698                 .procname       = "sg-big-buff",
 699                 .data           = &sg_big_buff,
 700                 .maxlen         = sizeof (int),
 701                 .mode           = 0444,
 702                 .proc_handler   = proc_dointvec,
 703         },
 704 #endif
 705 #ifdef CONFIG_BSD_PROCESS_ACCT
 706         {
 707                 .procname       = "acct",
 708                 .data           = &acct_parm,
 709                 .maxlen         = 3*sizeof(int),
 710                 .mode           = 0644,
 711                 .proc_handler   = proc_dointvec,
 712         },
 713 #endif
 714 #ifdef CONFIG_MAGIC_SYSRQ
 715         {
 716                 .procname       = "sysrq",
 717                 .data           = &__sysrq_enabled,
 718                 .maxlen         = sizeof (int),
 719                 .mode           = 0644,
 720                 .proc_handler   = sysrq_sysctl_handler,
 721         },
 722 #endif
 723 #ifdef CONFIG_PROC_SYSCTL
 724         {
 725                 .procname       = "cad_pid",
 726                 .data           = NULL,
 727                 .maxlen         = sizeof (int),
 728                 .mode           = 0600,
 729                 .proc_handler   = proc_do_cad_pid,
 730         },
 731 #endif
 732         {
 733                 .procname       = "threads-max",
 734                 .data           = NULL,
 735                 .maxlen         = sizeof(int),
 736                 .mode           = 0644,
 737                 .proc_handler   = sysctl_max_threads,
 738         },
 739         {
 740                 .procname       = "random",
 741                 .mode           = 0555,
 742                 .child          = random_table,
 743         },
 744         {
 745                 .procname       = "usermodehelper",
 746                 .mode           = 0555,
 747                 .child          = usermodehelper_table,
 748         },
 749         {
 750                 .procname       = "overflowuid",
 751                 .data           = &overflowuid,
 752                 .maxlen         = sizeof(int),
 753                 .mode           = 0644,
 754                 .proc_handler   = proc_dointvec_minmax,
 755                 .extra1         = &minolduid,
 756                 .extra2         = &maxolduid,
 757         },
 758         {
 759                 .procname       = "overflowgid",
 760                 .data           = &overflowgid,
 761                 .maxlen         = sizeof(int),
 762                 .mode           = 0644,
 763                 .proc_handler   = proc_dointvec_minmax,
 764                 .extra1         = &minolduid,
 765                 .extra2         = &maxolduid,
 766         },
 767 #ifdef CONFIG_S390
 768 #ifdef CONFIG_MATHEMU
 769         {
 770                 .procname       = "ieee_emulation_warnings",
 771                 .data           = &sysctl_ieee_emulation_warnings,
 772                 .maxlen         = sizeof(int),
 773                 .mode           = 0644,
 774                 .proc_handler   = proc_dointvec,
 775         },
 776 #endif
 777         {
 778                 .procname       = "userprocess_debug",
 779                 .data           = &show_unhandled_signals,
 780                 .maxlen         = sizeof(int),
 781                 .mode           = 0644,
 782                 .proc_handler   = proc_dointvec,
 783         },
 784 #endif
 785         {
 786                 .procname       = "pid_max",
 787                 .data           = &pid_max,
 788                 .maxlen         = sizeof (int),
 789                 .mode           = 0644,
 790                 .proc_handler   = proc_dointvec_minmax,
 791                 .extra1         = &pid_max_min,
 792                 .extra2         = &pid_max_max,
 793         },
 794         {
 795                 .procname       = "panic_on_oops",
 796                 .data           = &panic_on_oops,
 797                 .maxlen         = sizeof(int),
 798                 .mode           = 0644,
 799                 .proc_handler   = proc_dointvec,
 800         },
 801 #if defined CONFIG_PRINTK
 802         {
 803                 .procname       = "printk",
 804                 .data           = &console_loglevel,
 805                 .maxlen         = 4*sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = proc_dointvec,
 808         },
 809         {
 810                 .procname       = "printk_ratelimit",
 811                 .data           = &printk_ratelimit_state.interval,
 812                 .maxlen         = sizeof(int),
 813                 .mode           = 0644,
 814                 .proc_handler   = proc_dointvec_jiffies,
 815         },
 816         {
 817                 .procname       = "printk_ratelimit_burst",
 818                 .data           = &printk_ratelimit_state.burst,
 819                 .maxlen         = sizeof(int),
 820                 .mode           = 0644,
 821                 .proc_handler   = proc_dointvec,
 822         },
 823         {
 824                 .procname       = "printk_delay",
 825                 .data           = &printk_delay_msec,
 826                 .maxlen         = sizeof(int),
 827                 .mode           = 0644,
 828                 .proc_handler   = proc_dointvec_minmax,
 829                 .extra1         = &zero,
 830                 .extra2         = &ten_thousand,
 831         },
 832         {
 833                 .procname       = "printk_devkmsg",
 834                 .data           = devkmsg_log_str,
 835                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
 836                 .mode           = 0644,
 837                 .proc_handler   = devkmsg_sysctl_set_loglvl,
 838         },
 839         {
 840                 .procname       = "dmesg_restrict",
 841                 .data           = &dmesg_restrict,
 842                 .maxlen         = sizeof(int),
 843                 .mode           = 0644,
 844                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 845                 .extra1         = &zero,
 846                 .extra2         = &one,
 847         },
 848         {
 849                 .procname       = "kptr_restrict",
 850                 .data           = &kptr_restrict,
 851                 .maxlen         = sizeof(int),
 852                 .mode           = 0644,
 853                 .proc_handler   = proc_dointvec_minmax_sysadmin,
 854                 .extra1         = &zero,
 855                 .extra2         = &two,
 856         },
 857 #endif
 858         {
 859                 .procname       = "ngroups_max",
 860                 .data           = &ngroups_max,
 861                 .maxlen         = sizeof (int),
 862                 .mode           = 0444,
 863                 .proc_handler   = proc_dointvec,
 864         },
 865         {
 866                 .procname       = "cap_last_cap",
 867                 .data           = (void *)&cap_last_cap,
 868                 .maxlen         = sizeof(int),
 869                 .mode           = 0444,
 870                 .proc_handler   = proc_dointvec,
 871         },
 872 #if defined(CONFIG_LOCKUP_DETECTOR)
 873         {
 874                 .procname       = "watchdog",
 875                 .data           = &watchdog_user_enabled,
 876                 .maxlen         = sizeof(int),
 877                 .mode           = 0644,
 878                 .proc_handler   = proc_watchdog,
 879                 .extra1         = &zero,
 880                 .extra2         = &one,
 881         },
 882         {
 883                 .procname       = "watchdog_thresh",
 884                 .data           = &watchdog_thresh,
 885                 .maxlen         = sizeof(int),
 886                 .mode           = 0644,
 887                 .proc_handler   = proc_watchdog_thresh,
 888                 .extra1         = &zero,
 889                 .extra2         = &sixty,
 890         },
 891         {
 892                 .procname       = "nmi_watchdog",
 893                 .data           = &nmi_watchdog_user_enabled,
 894                 .maxlen         = sizeof(int),
 895                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
 896                 .proc_handler   = proc_nmi_watchdog,
 897                 .extra1         = &zero,
 898                 .extra2         = &one,
 899         },
 900         {
 901                 .procname       = "watchdog_cpumask",
 902                 .data           = &watchdog_cpumask_bits,
 903                 .maxlen         = NR_CPUS,
 904                 .mode           = 0644,
 905                 .proc_handler   = proc_watchdog_cpumask,
 906         },
 907 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
 908         {
 909                 .procname       = "soft_watchdog",
 910                 .data           = &soft_watchdog_user_enabled,
 911                 .maxlen         = sizeof(int),
 912                 .mode           = 0644,
 913                 .proc_handler   = proc_soft_watchdog,
 914                 .extra1         = &zero,
 915                 .extra2         = &one,
 916         },
 917         {
 918                 .procname       = "softlockup_panic",
 919                 .data           = &softlockup_panic,
 920                 .maxlen         = sizeof(int),
 921                 .mode           = 0644,
 922                 .proc_handler   = proc_dointvec_minmax,
 923                 .extra1         = &zero,
 924                 .extra2         = &one,
 925         },
 926 #ifdef CONFIG_SMP
 927         {
 928                 .procname       = "softlockup_all_cpu_backtrace",
 929                 .data           = &sysctl_softlockup_all_cpu_backtrace,
 930                 .maxlen         = sizeof(int),
 931                 .mode           = 0644,
 932                 .proc_handler   = proc_dointvec_minmax,
 933                 .extra1         = &zero,
 934                 .extra2         = &one,
 935         },
 936 #endif /* CONFIG_SMP */
 937 #endif
 938 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 939         {
 940                 .procname       = "hardlockup_panic",
 941                 .data           = &hardlockup_panic,
 942                 .maxlen         = sizeof(int),
 943                 .mode           = 0644,
 944                 .proc_handler   = proc_dointvec_minmax,
 945                 .extra1         = &zero,
 946                 .extra2         = &one,
 947         },
 948 #ifdef CONFIG_SMP
 949         {
 950                 .procname       = "hardlockup_all_cpu_backtrace",
 951                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
 952                 .maxlen         = sizeof(int),
 953                 .mode           = 0644,
 954                 .proc_handler   = proc_dointvec_minmax,
 955                 .extra1         = &zero,
 956                 .extra2         = &one,
 957         },
 958 #endif /* CONFIG_SMP */
 959 #endif
 960 #endif
 961
 962 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 963         {
 964                 .procname       = "unknown_nmi_panic",
 965                 .data           = &unknown_nmi_panic,
 966                 .maxlen         = sizeof (int),
 967                 .mode           = 0644,
 968                 .proc_handler   = proc_dointvec,
 969         },
 970 #endif
 971 #if defined(CONFIG_X86)
 972         {
 973                 .procname       = "panic_on_unrecovered_nmi",
 974                 .data           = &panic_on_unrecovered_nmi,
 975                 .maxlen         = sizeof(int),
 976                 .mode           = 0644,
 977                 .proc_handler   = proc_dointvec,
 978         },
 979         {
 980                 .procname       = "panic_on_io_nmi",
 981                 .data           = &panic_on_io_nmi,
 982                 .maxlen         = sizeof(int),
 983                 .mode           = 0644,
 984                 .proc_handler   = proc_dointvec,
 985         },
 986 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 987         {
 988                 .procname       = "panic_on_stackoverflow",
 989                 .data           = &sysctl_panic_on_stackoverflow,
 990                 .maxlen         = sizeof(int),
 991                 .mode           = 0644,
 992                 .proc_handler   = proc_dointvec,
 993         },
 994 #endif
 995         {
 996                 .procname       = "bootloader_type",
 997                 .data           = &bootloader_type,
 998                 .maxlen         = sizeof (int),
 999                 .mode           = 0444,
1000                 .proc_handler   = proc_dointvec,
1001         },
1002         {
1003                 .procname       = "bootloader_version",
1004                 .data           = &bootloader_version,
1005                 .maxlen         = sizeof (int),
1006                 .mode           = 0444,
1007                 .proc_handler   = proc_dointvec,
1008         },
1009         {
1010                 .procname       = "io_delay_type",
1011                 .data           = &io_delay_type,
1012                 .maxlen         = sizeof(int),
1013                 .mode           = 0644,
1014                 .proc_handler   = proc_dointvec,
1015         },
1016 #endif
1017 #if defined(CONFIG_MMU)
1018         {
1019                 .procname       = "randomize_va_space",
1020                 .data           = &randomize_va_space,
1021                 .maxlen         = sizeof(int),
1022                 .mode           = 0644,
1023                 .proc_handler   = proc_dointvec,
1024         },
1025 #endif
1026 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1027         {
1028                 .procname       = "spin_retry",
1029                 .data           = &spin_retry,
1030                 .maxlen         = sizeof (int),
1031                 .mode           = 0644,
1032                 .proc_handler   = proc_dointvec,
1033         },
1034 #endif
1035 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1036         {
1037                 .procname       = "acpi_video_flags",
1038                 .data           = &acpi_realmode_flags,
1039                 .maxlen         = sizeof (unsigned long),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_doulongvec_minmax,
1042         },
1043 #endif
1044 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1045         {
1046                 .procname       = "ignore-unaligned-usertrap",
1047                 .data           = &no_unaligned_warning,
1048                 .maxlen         = sizeof (int),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_dointvec,
1051         },
1052 #endif
1053 #ifdef CONFIG_IA64
1054         {
1055                 .procname       = "unaligned-dump-stack",
1056                 .data           = &unaligned_dump_stack,
1057                 .maxlen         = sizeof (int),
1058                 .mode           = 0644,
1059                 .proc_handler   = proc_dointvec,
1060         },
1061 #endif
1062 #ifdef CONFIG_DETECT_HUNG_TASK
1063         {
1064                 .procname       = "hung_task_panic",
1065                 .data           = &sysctl_hung_task_panic,
1066                 .maxlen         = sizeof(int),
1067                 .mode           = 0644,
1068                 .proc_handler   = proc_dointvec_minmax,
1069                 .extra1         = &zero,
1070                 .extra2         = &one,
1071         },
1072         {
1073                 .procname       = "hung_task_check_count",
1074                 .data           = &sysctl_hung_task_check_count,
1075                 .maxlen         = sizeof(int),
1076                 .mode           = 0644,
1077                 .proc_handler   = proc_dointvec_minmax,
1078                 .extra1         = &zero,
1079         },
1080         {
1081                 .procname       = "hung_task_timeout_secs",
1082                 .data           = &sysctl_hung_task_timeout_secs,
1083                 .maxlen         = sizeof(unsigned long),
1084                 .mode           = 0644,
1085                 .proc_handler   = proc_dohung_task_timeout_secs,
1086                 .extra2         = &hung_task_timeout_max,
1087         },
1088         {
1089                 .procname       = "hung_task_warnings",
1090                 .data           = &sysctl_hung_task_warnings,
1091                 .maxlen         = sizeof(int),
1092                 .mode           = 0644,
1093                 .proc_handler   = proc_dointvec_minmax,
1094                 .extra1         = &neg_one,
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         {
1178                 .procname       = "panic_on_warn",
1179                 .data           = &panic_on_warn,
1180                 .maxlen         = sizeof(int),
1181                 .mode           = 0644,
1182                 .proc_handler   = proc_dointvec_minmax,
1183                 .extra1         = &zero,
1184                 .extra2         = &one,
1185         },
1186 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1187         {
1188                 .procname       = "timer_migration",
1189                 .data           = &sysctl_timer_migration,
1190                 .maxlen         = sizeof(unsigned int),
1191                 .mode           = 0644,
1192                 .proc_handler   = timer_migration_handler,
1193                 .extra1         = &zero,
1194                 .extra2         = &one,
1195         },
1196 #endif
1197 #ifdef CONFIG_BPF_SYSCALL
1198         {
1199                 .procname       = "unprivileged_bpf_disabled",
1200                 .data           = &sysctl_unprivileged_bpf_disabled,
1201                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
1202                 .mode           = 0644,
1203                 /* only handle a transition from default "0" to "1" */
1204                 .proc_handler   = proc_dointvec_minmax,
1205                 .extra1         = &one,
1206                 .extra2         = &one,
1207         },
1208 #endif
1209 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1210         {
1211                 .procname       = "panic_on_rcu_stall",
1212                 .data           = &sysctl_panic_on_rcu_stall,
1213                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
1214                 .mode           = 0644,
1215                 .proc_handler   = proc_dointvec_minmax,
1216                 .extra1         = &zero,
1217                 .extra2         = &one,
1218         },
1219 #endif
1220         { }
1221 };
1222
1223 static struct ctl_table vm_table[] = {
1224         {
1225                 .procname       = "overcommit_memory",
1226                 .data           = &sysctl_overcommit_memory,
1227                 .maxlen         = sizeof(sysctl_overcommit_memory),
1228                 .mode           = 0644,
1229                 .proc_handler   = proc_dointvec_minmax,
1230                 .extra1         = &zero,
1231                 .extra2         = &two,
1232         },
1233         {
1234                 .procname       = "panic_on_oom",
1235                 .data           = &sysctl_panic_on_oom,
1236                 .maxlen         = sizeof(sysctl_panic_on_oom),
1237                 .mode           = 0644,
1238                 .proc_handler   = proc_dointvec_minmax,
1239                 .extra1         = &zero,
1240                 .extra2         = &two,
1241         },
1242         {
1243                 .procname       = "oom_kill_allocating_task",
1244                 .data           = &sysctl_oom_kill_allocating_task,
1245                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1246                 .mode           = 0644,
1247                 .proc_handler   = proc_dointvec,
1248         },
1249         {
1250                 .procname       = "oom_dump_tasks",
1251                 .data           = &sysctl_oom_dump_tasks,
1252                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1253                 .mode           = 0644,
1254                 .proc_handler   = proc_dointvec,
1255         },
1256         {
1257                 .procname       = "overcommit_ratio",
1258                 .data           = &sysctl_overcommit_ratio,
1259                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1260                 .mode           = 0644,
1261                 .proc_handler   = overcommit_ratio_handler,
1262         },
1263         {
1264                 .procname       = "overcommit_kbytes",
1265                 .data           = &sysctl_overcommit_kbytes,
1266                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1267                 .mode           = 0644,
1268                 .proc_handler   = overcommit_kbytes_handler,
1269         },
1270         {
1271                 .procname       = "page-cluster",
1272                 .data           = &page_cluster,
1273                 .maxlen         = sizeof(int),
1274                 .mode           = 0644,
1275                 .proc_handler   = proc_dointvec_minmax,
1276                 .extra1         = &zero,
1277         },
1278         {
1279                 .procname       = "dirty_background_ratio",
1280                 .data           = &dirty_background_ratio,
1281                 .maxlen         = sizeof(dirty_background_ratio),
1282                 .mode           = 0644,
1283                 .proc_handler   = dirty_background_ratio_handler,
1284                 .extra1         = &zero,
1285                 .extra2         = &one_hundred,
1286         },
1287         {
1288                 .procname       = "dirty_background_bytes",
1289                 .data           = &dirty_background_bytes,
1290                 .maxlen         = sizeof(dirty_background_bytes),
1291                 .mode           = 0644,
1292                 .proc_handler   = dirty_background_bytes_handler,
1293                 .extra1         = &one_ul,
1294         },
1295         {
1296                 .procname       = "dirty_ratio",
1297                 .data           = &vm_dirty_ratio,
1298                 .maxlen         = sizeof(vm_dirty_ratio),
1299                 .mode           = 0644,
1300                 .proc_handler   = dirty_ratio_handler,
1301                 .extra1         = &zero,
1302                 .extra2         = &one_hundred,
1303         },
1304         {
1305                 .procname       = "dirty_bytes",
1306                 .data           = &vm_dirty_bytes,
1307                 .maxlen         = sizeof(vm_dirty_bytes),
1308                 .mode           = 0644,
1309                 .proc_handler   = dirty_bytes_handler,
1310                 .extra1         = &dirty_bytes_min,
1311         },
1312         {
1313                 .procname       = "dirty_writeback_centisecs",
1314                 .data           = &dirty_writeback_interval,
1315                 .maxlen         = sizeof(dirty_writeback_interval),
1316                 .mode           = 0644,
1317                 .proc_handler   = dirty_writeback_centisecs_handler,
1318         },
1319         {
1320                 .procname       = "dirty_expire_centisecs",
1321                 .data           = &dirty_expire_interval,
1322                 .maxlen         = sizeof(dirty_expire_interval),
1323                 .mode           = 0644,
1324                 .proc_handler   = proc_dointvec_minmax,
1325                 .extra1         = &zero,
1326         },
1327         {
1328                 .procname       = "dirtytime_expire_seconds",
1329                 .data           = &dirtytime_expire_interval,
1330                 .maxlen         = sizeof(dirty_expire_interval),
1331                 .mode           = 0644,
1332                 .proc_handler   = dirtytime_interval_handler,
1333                 .extra1         = &zero,
1334         },
1335         {
1336                 .procname       = "swappiness",
1337                 .data           = &vm_swappiness,
1338                 .maxlen         = sizeof(vm_swappiness),
1339                 .mode           = 0644,
1340                 .proc_handler   = proc_dointvec_minmax,
1341                 .extra1         = &zero,
1342                 .extra2         = &one_hundred,
1343         },
1344 #ifdef CONFIG_HUGETLB_PAGE
1345         {
1346                 .procname       = "nr_hugepages",
1347                 .data           = NULL,
1348                 .maxlen         = sizeof(unsigned long),
1349                 .mode           = 0644,
1350                 .proc_handler   = hugetlb_sysctl_handler,
1351         },
1352 #ifdef CONFIG_NUMA
1353         {
1354                 .procname       = "nr_hugepages_mempolicy",
1355                 .data           = NULL,
1356                 .maxlen         = sizeof(unsigned long),
1357                 .mode           = 0644,
1358                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1359         },
1360         {
1361                 .procname               = "numa_stat",
1362                 .data                   = &sysctl_vm_numa_stat,
1363                 .maxlen                 = sizeof(int),
1364                 .mode                   = 0644,
1365                 .proc_handler   = sysctl_vm_numa_stat_handler,
1366                 .extra1                 = &zero,
1367                 .extra2                 = &one,
1368         },
1369 #endif
1370          {
1371                 .procname       = "hugetlb_shm_group",
1372                 .data           = &sysctl_hugetlb_shm_group,
1373                 .maxlen         = sizeof(gid_t),
1374                 .mode           = 0644,
1375                 .proc_handler   = proc_dointvec,
1376          },
1377          {
1378                 .procname       = "hugepages_treat_as_movable",
1379                 .data           = &hugepages_treat_as_movable,
1380                 .maxlen         = sizeof(int),
1381                 .mode           = 0644,
1382                 .proc_handler   = proc_dointvec,
1383         },
1384         {
1385                 .procname       = "nr_overcommit_hugepages",
1386                 .data           = NULL,
1387                 .maxlen         = sizeof(unsigned long),
1388                 .mode           = 0644,
1389                 .proc_handler   = hugetlb_overcommit_handler,
1390         },
1391 #endif
1392         {
1393                 .procname       = "lowmem_reserve_ratio",
1394                 .data           = &sysctl_lowmem_reserve_ratio,
1395                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1396                 .mode           = 0644,
1397                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1398         },
1399         {
1400                 .procname       = "drop_caches",
1401                 .data           = &sysctl_drop_caches,
1402                 .maxlen         = sizeof(int),
1403                 .mode           = 0644,
1404                 .proc_handler   = drop_caches_sysctl_handler,
1405                 .extra1         = &one,
1406                 .extra2         = &four,
1407         },
1408 #ifdef CONFIG_COMPACTION
1409         {
1410                 .procname       = "compact_memory",
1411                 .data           = &sysctl_compact_memory,
1412                 .maxlen         = sizeof(int),
1413                 .mode           = 0200,
1414                 .proc_handler   = sysctl_compaction_handler,
1415         },
1416         {
1417                 .procname       = "extfrag_threshold",
1418                 .data           = &sysctl_extfrag_threshold,
1419                 .maxlen         = sizeof(int),
1420                 .mode           = 0644,
1421                 .proc_handler   = sysctl_extfrag_handler,
1422                 .extra1         = &min_extfrag_threshold,
1423                 .extra2         = &max_extfrag_threshold,
1424         },
1425         {
1426                 .procname       = "compact_unevictable_allowed",
1427                 .data           = &sysctl_compact_unevictable_allowed,
1428                 .maxlen         = sizeof(int),
1429                 .mode           = 0644,
1430                 .proc_handler   = proc_dointvec,
1431                 .extra1         = &zero,
1432                 .extra2         = &one,
1433         },
1434
1435 #endif /* CONFIG_COMPACTION */
1436         {
1437                 .procname       = "min_free_kbytes",
1438                 .data           = &min_free_kbytes,
1439                 .maxlen         = sizeof(min_free_kbytes),
1440                 .mode           = 0644,
1441                 .proc_handler   = min_free_kbytes_sysctl_handler,
1442                 .extra1         = &zero,
1443         },
1444         {
1445                 .procname       = "watermark_scale_factor",
1446                 .data           = &watermark_scale_factor,
1447                 .maxlen         = sizeof(watermark_scale_factor),
1448                 .mode           = 0644,
1449                 .proc_handler   = watermark_scale_factor_sysctl_handler,
1450                 .extra1         = &one,
1451                 .extra2         = &one_thousand,
1452         },
1453         {
1454                 .procname       = "percpu_pagelist_fraction",
1455                 .data           = &percpu_pagelist_fraction,
1456                 .maxlen         = sizeof(percpu_pagelist_fraction),
1457                 .mode           = 0644,
1458                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1459                 .extra1         = &zero,
1460         },
1461 #ifdef CONFIG_MMU
1462         {
1463                 .procname       = "max_map_count",
1464                 .data           = &sysctl_max_map_count,
1465                 .maxlen         = sizeof(sysctl_max_map_count),
1466                 .mode           = 0644,
1467                 .proc_handler   = proc_dointvec_minmax,
1468                 .extra1         = &zero,
1469         },
1470 #else
1471         {
1472                 .procname       = "nr_trim_pages",
1473                 .data           = &sysctl_nr_trim_pages,
1474                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1475                 .mode           = 0644,
1476                 .proc_handler   = proc_dointvec_minmax,
1477                 .extra1         = &zero,
1478         },
1479 #endif
1480         {
1481                 .procname       = "laptop_mode",
1482                 .data           = &laptop_mode,
1483                 .maxlen         = sizeof(laptop_mode),
1484                 .mode           = 0644,
1485                 .proc_handler   = proc_dointvec_jiffies,
1486         },
1487         {
1488                 .procname       = "block_dump",
1489                 .data           = &block_dump,
1490                 .maxlen         = sizeof(block_dump),
1491                 .mode           = 0644,
1492                 .proc_handler   = proc_dointvec,
1493                 .extra1         = &zero,
1494         },
1495         {
1496                 .procname       = "vfs_cache_pressure",
1497                 .data           = &sysctl_vfs_cache_pressure,
1498                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1499                 .mode           = 0644,
1500                 .proc_handler   = proc_dointvec,
1501                 .extra1         = &zero,
1502         },
1503 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1504         {
1505                 .procname       = "legacy_va_layout",
1506                 .data           = &sysctl_legacy_va_layout,
1507                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1508                 .mode           = 0644,
1509                 .proc_handler   = proc_dointvec,
1510                 .extra1         = &zero,
1511         },
1512 #endif
1513 #ifdef CONFIG_NUMA
1514         {
1515                 .procname       = "zone_reclaim_mode",
1516                 .data           = &node_reclaim_mode,
1517                 .maxlen         = sizeof(node_reclaim_mode),
1518                 .mode           = 0644,
1519                 .proc_handler   = proc_dointvec,
1520                 .extra1         = &zero,
1521         },
1522         {
1523                 .procname       = "min_unmapped_ratio",
1524                 .data           = &sysctl_min_unmapped_ratio,
1525                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1526                 .mode           = 0644,
1527                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1528                 .extra1         = &zero,
1529                 .extra2         = &one_hundred,
1530         },
1531         {
1532                 .procname       = "min_slab_ratio",
1533                 .data           = &sysctl_min_slab_ratio,
1534                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1535                 .mode           = 0644,
1536                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1537                 .extra1         = &zero,
1538                 .extra2         = &one_hundred,
1539         },
1540 #endif
1541 #ifdef CONFIG_SMP
1542         {
1543                 .procname       = "stat_interval",
1544                 .data           = &sysctl_stat_interval,
1545                 .maxlen         = sizeof(sysctl_stat_interval),
1546                 .mode           = 0644,
1547                 .proc_handler   = proc_dointvec_jiffies,
1548         },
1549         {
1550                 .procname       = "stat_refresh",
1551                 .data           = NULL,
1552                 .maxlen         = 0,
1553                 .mode           = 0600,
1554                 .proc_handler   = vmstat_refresh,
1555         },
1556 #endif
1557 #ifdef CONFIG_MMU
1558         {
1559                 .procname       = "mmap_min_addr",
1560                 .data           = &dac_mmap_min_addr,
1561                 .maxlen         = sizeof(unsigned long),
1562                 .mode           = 0644,
1563                 .proc_handler   = mmap_min_addr_handler,
1564         },
1565 #endif
1566 #ifdef CONFIG_NUMA
1567         {
1568                 .procname       = "numa_zonelist_order",
1569                 .data           = &numa_zonelist_order,
1570                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1571                 .mode           = 0644,
1572                 .proc_handler   = numa_zonelist_order_handler,
1573         },
1574 #endif
1575 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1576    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1577         {
1578                 .procname       = "vdso_enabled",
1579 #ifdef CONFIG_X86_32
1580                 .data           = &vdso32_enabled,
1581                 .maxlen         = sizeof(vdso32_enabled),
1582 #else
1583                 .data           = &vdso_enabled,
1584                 .maxlen         = sizeof(vdso_enabled),
1585 #endif
1586                 .mode           = 0644,
1587                 .proc_handler   = proc_dointvec,
1588                 .extra1         = &zero,
1589         },
1590 #endif
1591 #ifdef CONFIG_HIGHMEM
1592         {
1593                 .procname       = "highmem_is_dirtyable",
1594                 .data           = &vm_highmem_is_dirtyable,
1595                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1596                 .mode           = 0644,
1597                 .proc_handler   = proc_dointvec_minmax,
1598                 .extra1         = &zero,
1599                 .extra2         = &one,
1600         },
1601 #endif
1602 #ifdef CONFIG_MEMORY_FAILURE
1603         {
1604                 .procname       = "memory_failure_early_kill",
1605                 .data           = &sysctl_memory_failure_early_kill,
1606                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1607                 .mode           = 0644,
1608                 .proc_handler   = proc_dointvec_minmax,
1609                 .extra1         = &zero,
1610                 .extra2         = &one,
1611         },
1612         {
1613                 .procname       = "memory_failure_recovery",
1614                 .data           = &sysctl_memory_failure_recovery,
1615                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1616                 .mode           = 0644,
1617                 .proc_handler   = proc_dointvec_minmax,
1618                 .extra1         = &zero,
1619                 .extra2         = &one,
1620         },
1621 #endif
1622         {
1623                 .procname       = "user_reserve_kbytes",
1624                 .data           = &sysctl_user_reserve_kbytes,
1625                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1626                 .mode           = 0644,
1627                 .proc_handler   = proc_doulongvec_minmax,
1628         },
1629         {
1630                 .procname       = "admin_reserve_kbytes",
1631                 .data           = &sysctl_admin_reserve_kbytes,
1632                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1633                 .mode           = 0644,
1634                 .proc_handler   = proc_doulongvec_minmax,
1635         },
1636 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1637         {
1638                 .procname       = "mmap_rnd_bits",
1639                 .data           = &mmap_rnd_bits,
1640                 .maxlen         = sizeof(mmap_rnd_bits),
1641                 .mode           = 0600,
1642                 .proc_handler   = proc_dointvec_minmax,
1643                 .extra1         = (void *)&mmap_rnd_bits_min,
1644                 .extra2         = (void *)&mmap_rnd_bits_max,
1645         },
1646 #endif
1647 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1648         {
1649                 .procname       = "mmap_rnd_compat_bits",
1650                 .data           = &mmap_rnd_compat_bits,
1651                 .maxlen         = sizeof(mmap_rnd_compat_bits),
1652                 .mode           = 0600,
1653                 .proc_handler   = proc_dointvec_minmax,
1654                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
1655                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
1656         },
1657 #endif
1658         { }
1659 };
1660
1661 static struct ctl_table fs_table[] = {
1662         {
1663                 .procname       = "inode-nr",
1664                 .data           = &inodes_stat,
1665                 .maxlen         = 2*sizeof(long),
1666                 .mode           = 0444,
1667                 .proc_handler   = proc_nr_inodes,
1668         },
1669         {
1670                 .procname       = "inode-state",
1671                 .data           = &inodes_stat,
1672                 .maxlen         = 7*sizeof(long),
1673                 .mode           = 0444,
1674                 .proc_handler   = proc_nr_inodes,
1675         },
1676         {
1677                 .procname       = "file-nr",
1678                 .data           = &files_stat,
1679                 .maxlen         = sizeof(files_stat),
1680                 .mode           = 0444,
1681                 .proc_handler   = proc_nr_files,
1682         },
1683         {
1684                 .procname       = "file-max",
1685                 .data           = &files_stat.max_files,
1686                 .maxlen         = sizeof(files_stat.max_files),
1687                 .mode           = 0644,
1688                 .proc_handler   = proc_doulongvec_minmax,
1689         },
1690         {
1691                 .procname       = "nr_open",
1692                 .data           = &sysctl_nr_open,
1693                 .maxlen         = sizeof(unsigned int),
1694                 .mode           = 0644,
1695                 .proc_handler   = proc_dointvec_minmax,
1696                 .extra1         = &sysctl_nr_open_min,
1697                 .extra2         = &sysctl_nr_open_max,
1698         },
1699         {
1700                 .procname       = "dentry-state",
1701                 .data           = &dentry_stat,
1702                 .maxlen         = 6*sizeof(long),
1703                 .mode           = 0444,
1704                 .proc_handler   = proc_nr_dentry,
1705         },
1706         {
1707                 .procname       = "overflowuid",
1708                 .data           = &fs_overflowuid,
1709                 .maxlen         = sizeof(int),
1710                 .mode           = 0644,
1711                 .proc_handler   = proc_dointvec_minmax,
1712                 .extra1         = &minolduid,
1713                 .extra2         = &maxolduid,
1714         },
1715         {
1716                 .procname       = "overflowgid",
1717                 .data           = &fs_overflowgid,
1718                 .maxlen         = sizeof(int),
1719                 .mode           = 0644,
1720                 .proc_handler   = proc_dointvec_minmax,
1721                 .extra1         = &minolduid,
1722                 .extra2         = &maxolduid,
1723         },
1724 #ifdef CONFIG_FILE_LOCKING
1725         {
1726                 .procname       = "leases-enable",
1727                 .data           = &leases_enable,
1728                 .maxlen         = sizeof(int),
1729                 .mode           = 0644,
1730                 .proc_handler   = proc_dointvec,
1731         },
1732 #endif
1733 #ifdef CONFIG_DNOTIFY
1734         {
1735                 .procname       = "dir-notify-enable",
1736                 .data           = &dir_notify_enable,
1737                 .maxlen         = sizeof(int),
1738                 .mode           = 0644,
1739                 .proc_handler   = proc_dointvec,
1740         },
1741 #endif
1742 #ifdef CONFIG_MMU
1743 #ifdef CONFIG_FILE_LOCKING
1744         {
1745                 .procname       = "lease-break-time",
1746                 .data           = &lease_break_time,
1747                 .maxlen         = sizeof(int),
1748                 .mode           = 0644,
1749                 .proc_handler   = proc_dointvec,
1750         },
1751 #endif
1752 #ifdef CONFIG_AIO
1753         {
1754                 .procname       = "aio-nr",
1755                 .data           = &aio_nr,
1756                 .maxlen         = sizeof(aio_nr),
1757                 .mode           = 0444,
1758                 .proc_handler   = proc_doulongvec_minmax,
1759         },
1760         {
1761                 .procname       = "aio-max-nr",
1762                 .data           = &aio_max_nr,
1763                 .maxlen         = sizeof(aio_max_nr),
1764                 .mode           = 0644,
1765                 .proc_handler   = proc_doulongvec_minmax,
1766         },
1767 #endif /* CONFIG_AIO */
1768 #ifdef CONFIG_INOTIFY_USER
1769         {
1770                 .procname       = "inotify",
1771                 .mode           = 0555,
1772                 .child          = inotify_table,
1773         },
1774 #endif
1775 #ifdef CONFIG_EPOLL
1776         {
1777                 .procname       = "epoll",
1778                 .mode           = 0555,
1779                 .child          = epoll_table,
1780         },
1781 #endif
1782 #endif
1783         {
1784                 .procname       = "protected_symlinks",
1785                 .data           = &sysctl_protected_symlinks,
1786                 .maxlen         = sizeof(int),
1787                 .mode           = 0600,
1788                 .proc_handler   = proc_dointvec_minmax,
1789                 .extra1         = &zero,
1790                 .extra2         = &one,
1791         },
1792         {
1793                 .procname       = "protected_hardlinks",
1794                 .data           = &sysctl_protected_hardlinks,
1795                 .maxlen         = sizeof(int),
1796                 .mode           = 0600,
1797                 .proc_handler   = proc_dointvec_minmax,
1798                 .extra1         = &zero,
1799                 .extra2         = &one,
1800         },
1801         {
1802                 .procname       = "suid_dumpable",
1803                 .data           = &suid_dumpable,
1804                 .maxlen         = sizeof(int),
1805                 .mode           = 0644,
1806                 .proc_handler   = proc_dointvec_minmax_coredump,
1807                 .extra1         = &zero,
1808                 .extra2         = &two,
1809         },
1810 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1811         {
1812                 .procname       = "binfmt_misc",
1813                 .mode           = 0555,
1814                 .child          = sysctl_mount_point,
1815         },
1816 #endif
1817         {
1818                 .procname       = "pipe-max-size",
1819                 .data           = &pipe_max_size,
1820                 .maxlen         = sizeof(pipe_max_size),
1821                 .mode           = 0644,
1822                 .proc_handler   = &pipe_proc_fn,
1823                 .extra1         = &pipe_min_size,
1824         },
1825         {
1826                 .procname       = "pipe-user-pages-hard",
1827                 .data           = &pipe_user_pages_hard,
1828                 .maxlen         = sizeof(pipe_user_pages_hard),
1829                 .mode           = 0644,
1830                 .proc_handler   = proc_doulongvec_minmax,
1831         },
1832         {
1833                 .procname       = "pipe-user-pages-soft",
1834                 .data           = &pipe_user_pages_soft,
1835                 .maxlen         = sizeof(pipe_user_pages_soft),
1836                 .mode           = 0644,
1837                 .proc_handler   = proc_doulongvec_minmax,
1838         },
1839         {
1840                 .procname       = "mount-max",
1841                 .data           = &sysctl_mount_max,
1842                 .maxlen         = sizeof(unsigned int),
1843                 .mode           = 0644,
1844                 .proc_handler   = proc_dointvec_minmax,
1845                 .extra1         = &one,
1846         },
1847         { }
1848 };
1849
1850 static struct ctl_table debug_table[] = {
1851 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1852         {
1853                 .procname       = "exception-trace",
1854                 .data           = &show_unhandled_signals,
1855                 .maxlen         = sizeof(int),
1856                 .mode           = 0644,
1857                 .proc_handler   = proc_dointvec
1858         },
1859 #endif
1860 #if defined(CONFIG_OPTPROBES)
1861         {
1862                 .procname       = "kprobes-optimization",
1863                 .data           = &sysctl_kprobes_optimization,
1864                 .maxlen         = sizeof(int),
1865                 .mode           = 0644,
1866                 .proc_handler   = proc_kprobes_optimization_handler,
1867                 .extra1         = &zero,
1868                 .extra2         = &one,
1869         },
1870 #endif
1871         { }
1872 };
1873
1874 static struct ctl_table dev_table[] = {
1875         { }
1876 };
1877
1878 int __init sysctl_init(void)
1879 {
1880         struct ctl_table_header *hdr;
1881
1882         hdr = register_sysctl_table(sysctl_base_table);
1883         kmemleak_not_leak(hdr);
1884         return 0;
1885 }
1886
1887 #endif /* CONFIG_SYSCTL */
1888
1889 /*
1890  * /proc/sys support
1891  */
1892
1893 #ifdef CONFIG_PROC_SYSCTL
1894
1895 static int _proc_do_string(char *data, int maxlen, int write,
1896                            char __user *buffer,
1897                            size_t *lenp, loff_t *ppos)
1898 {
1899         size_t len;
1900         char __user *p;
1901         char c;
1902
1903         if (!data || !maxlen || !*lenp) {
1904                 *lenp = 0;
1905                 return 0;
1906         }
1907
1908         if (write) {
1909                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1910                         /* Only continue writes not past the end of buffer. */
1911                         len = strlen(data);
1912                         if (len > maxlen - 1)
1913                                 len = maxlen - 1;
1914
1915                         if (*ppos > len)
1916                                 return 0;
1917                         len = *ppos;
1918                 } else {
1919                         /* Start writing from beginning of buffer. */
1920                         len = 0;
1921                 }
1922
1923                 *ppos += *lenp;
1924                 p = buffer;
1925                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1926                         if (get_user(c, p++))
1927                                 return -EFAULT;
1928                         if (c == 0 || c == '\n')
1929                                 break;
1930                         data[len++] = c;
1931                 }
1932                 data[len] = 0;
1933         } else {
1934                 len = strlen(data);
1935                 if (len > maxlen)
1936                         len = maxlen;
1937
1938                 if (*ppos > len) {
1939                         *lenp = 0;
1940                         return 0;
1941                 }
1942
1943                 data += *ppos;
1944                 len  -= *ppos;
1945
1946                 if (len > *lenp)
1947                         len = *lenp;
1948                 if (len)
1949                         if (copy_to_user(buffer, data, len))
1950                                 return -EFAULT;
1951                 if (len < *lenp) {
1952                         if (put_user('\n', buffer + len))
1953                                 return -EFAULT;
1954                         len++;
1955                 }
1956                 *lenp = len;
1957                 *ppos += len;
1958         }
1959         return 0;
1960 }
1961
1962 static void warn_sysctl_write(struct ctl_table *table)
1963 {
1964         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1965                 "This will not be supported in the future. To silence this\n"
1966                 "warning, set kernel.sysctl_writes_strict = -1\n",
1967                 current->comm, table->procname);
1968 }
1969
1970 /**
1971  * proc_first_pos_non_zero_ignore - check if firs position is allowed
1972  * @ppos: file position
1973  * @table: the sysctl table
1974  *
1975  * Returns true if the first position is non-zero and the sysctl_writes_strict
1976  * mode indicates this is not allowed for numeric input types. String proc
1977  * hadlers can ignore the return value.
1978  */
1979 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1980                                            struct ctl_table *table)
1981 {
1982         if (!*ppos)
1983                 return false;
1984
1985         switch (sysctl_writes_strict) {
1986         case SYSCTL_WRITES_STRICT:
1987                 return true;
1988         case SYSCTL_WRITES_WARN:
1989                 warn_sysctl_write(table);
1990                 return false;
1991         default:
1992                 return false;
1993         }
1994 }
1995
1996 /**
1997  * proc_dostring - read a string sysctl
1998  * @table: the sysctl table
1999  * @write: %TRUE if this is a write to the sysctl file
2000  * @buffer: the user buffer
2001  * @lenp: the size of the user buffer
2002  * @ppos: file position
2003  *
2004  * Reads/writes a string from/to the user buffer. If the kernel
2005  * buffer provided is not large enough to hold the string, the
2006  * string is truncated. The copied string is %NULL-terminated.
2007  * If the string is being read by the user process, it is copied
2008  * and a newline '\n' is added. It is truncated if the buffer is
2009  * not large enough.
2010  *
2011  * Returns 0 on success.
2012  */
2013 int proc_dostring(struct ctl_table *table, int write,
2014                   void __user *buffer, size_t *lenp, loff_t *ppos)
2015 {
2016         if (write)
2017                 proc_first_pos_non_zero_ignore(ppos, table);
2018
2019         return _proc_do_string((char *)(table->data), table->maxlen, write,
2020                                (char __user *)buffer, lenp, ppos);
2021 }
2022
2023 static size_t proc_skip_spaces(char **buf)
2024 {
2025         size_t ret;
2026         char *tmp = skip_spaces(*buf);
2027         ret = tmp - *buf;
2028         *buf = tmp;
2029         return ret;
2030 }
2031
2032 static void proc_skip_char(char **buf, size_t *size, const char v)
2033 {
2034         while (*size) {
2035                 if (**buf != v)
2036                         break;
2037                 (*size)--;
2038                 (*buf)++;
2039         }
2040 }
2041
2042 #define TMPBUFLEN 22
2043 /**
2044  * proc_get_long - reads an ASCII formatted integer from a user buffer
2045  *
2046  * @buf: a kernel buffer
2047  * @size: size of the kernel buffer
2048  * @val: this is where the number will be stored
2049  * @neg: set to %TRUE if number is negative
2050  * @perm_tr: a vector which contains the allowed trailers
2051  * @perm_tr_len: size of the perm_tr vector
2052  * @tr: pointer to store the trailer character
2053  *
2054  * In case of success %0 is returned and @buf and @size are updated with
2055  * the amount of bytes read. If @tr is non-NULL and a trailing
2056  * character exists (size is non-zero after returning from this
2057  * function), @tr is updated with the trailing character.
2058  */
2059 static int proc_get_long(char **buf, size_t *size,
2060                           unsigned long *val, bool *neg,
2061                           const char *perm_tr, unsigned perm_tr_len, char *tr)
2062 {
2063         int len;
2064         char *p, tmp[TMPBUFLEN];
2065
2066         if (!*size)
2067                 return -EINVAL;
2068
2069         len = *size;
2070         if (len > TMPBUFLEN - 1)
2071                 len = TMPBUFLEN - 1;
2072
2073         memcpy(tmp, *buf, len);
2074
2075         tmp[len] = 0;
2076         p = tmp;
2077         if (*p == '-' && *size > 1) {
2078                 *neg = true;
2079                 p++;
2080         } else
2081                 *neg = false;
2082         if (!isdigit(*p))
2083                 return -EINVAL;
2084
2085         *val = simple_strtoul(p, &p, 0);
2086
2087         len = p - tmp;
2088
2089         /* We don't know if the next char is whitespace thus we may accept
2090          * invalid integers (e.g. 1234...a) or two integers instead of one
2091          * (e.g. 123...1). So lets not allow such large numbers. */
2092         if (len == TMPBUFLEN - 1)
2093                 return -EINVAL;
2094
2095         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2096                 return -EINVAL;
2097
2098         if (tr && (len < *size))
2099                 *tr = *p;
2100
2101         *buf += len;
2102         *size -= len;
2103
2104         return 0;
2105 }
2106
2107 /**
2108  * proc_put_long - converts an integer to a decimal ASCII formatted string
2109  *
2110  * @buf: the user buffer
2111  * @size: the size of the user buffer
2112  * @val: the integer to be converted
2113  * @neg: sign of the number, %TRUE for negative
2114  *
2115  * In case of success %0 is returned and @buf and @size are updated with
2116  * the amount of bytes written.
2117  */
2118 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2119                           bool neg)
2120 {
2121         int len;
2122         char tmp[TMPBUFLEN], *p = tmp;
2123
2124         sprintf(p, "%s%lu", neg ? "-" : "", val);
2125         len = strlen(tmp);
2126         if (len > *size)
2127                 len = *size;
2128         if (copy_to_user(*buf, tmp, len))
2129                 return -EFAULT;
2130         *size -= len;
2131         *buf += len;
2132         return 0;
2133 }
2134 #undef TMPBUFLEN
2135
2136 static int proc_put_char(void __user **buf, size_t *size, char c)
2137 {
2138         if (*size) {
2139                 char __user **buffer = (char __user **)buf;
2140                 if (put_user(c, *buffer))
2141                         return -EFAULT;
2142                 (*size)--, (*buffer)++;
2143                 *buf = *buffer;
2144         }
2145         return 0;
2146 }
2147
2148 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2149                                  int *valp,
2150                                  int write, void *data)
2151 {
2152         if (write) {
2153                 if (*negp) {
2154                         if (*lvalp > (unsigned long) INT_MAX + 1)
2155                                 return -EINVAL;
2156                         *valp = -*lvalp;
2157                 } else {
2158                         if (*lvalp > (unsigned long) INT_MAX)
2159                                 return -EINVAL;
2160                         *valp = *lvalp;
2161                 }
2162         } else {
2163                 int val = *valp;
2164                 if (val < 0) {
2165                         *negp = true;
2166                         *lvalp = -(unsigned long)val;
2167                 } else {
2168                         *negp = false;
2169                         *lvalp = (unsigned long)val;
2170                 }
2171         }
2172         return 0;
2173 }
2174
2175 static int do_proc_douintvec_conv(unsigned long *lvalp,
2176                                   unsigned int *valp,
2177                                   int write, void *data)
2178 {
2179         if (write) {
2180                 if (*lvalp > UINT_MAX)
2181                         return -EINVAL;
2182                 *valp = *lvalp;
2183         } else {
2184                 unsigned int val = *valp;
2185                 *lvalp = (unsigned long)val;
2186         }
2187         return 0;
2188 }
2189
2190 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2191
2192 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2193                   int write, void __user *buffer,
2194                   size_t *lenp, loff_t *ppos,
2195                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2196                               int write, void *data),
2197                   void *data)
2198 {
2199         int *i, vleft, first = 1, err = 0;
2200         size_t left;
2201         char *kbuf = NULL, *p;
2202
2203         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2204                 *lenp = 0;
2205                 return 0;
2206         }
2207
2208         i = (int *) tbl_data;
2209         vleft = table->maxlen / sizeof(*i);
2210         left = *lenp;
2211
2212         if (!conv)
2213                 conv = do_proc_dointvec_conv;
2214
2215         if (write) {
2216                 if (proc_first_pos_non_zero_ignore(ppos, table))
2217                         goto out;
2218
2219                 if (left > PAGE_SIZE - 1)
2220                         left = PAGE_SIZE - 1;
2221                 p = kbuf = memdup_user_nul(buffer, left);
2222                 if (IS_ERR(kbuf))
2223                         return PTR_ERR(kbuf);
2224         }
2225
2226         for (; left && vleft--; i++, first=0) {
2227                 unsigned long lval;
2228                 bool neg;
2229
2230                 if (write) {
2231                         left -= proc_skip_spaces(&p);
2232
2233                         if (!left)
2234                                 break;
2235                         err = proc_get_long(&p, &left, &lval, &neg,
2236                                              proc_wspace_sep,
2237                                              sizeof(proc_wspace_sep), NULL);
2238                         if (err)
2239                                 break;
2240                         if (conv(&neg, &lval, i, 1, data)) {
2241                                 err = -EINVAL;
2242                                 break;
2243                         }
2244                 } else {
2245                         if (conv(&neg, &lval, i, 0, data)) {
2246                                 err = -EINVAL;
2247                                 break;
2248                         }
2249                         if (!first)
2250                                 err = proc_put_char(&buffer, &left, '\t');
2251                         if (err)
2252                                 break;
2253                         err = proc_put_long(&buffer, &left, lval, neg);
2254                         if (err)
2255                                 break;
2256                 }
2257         }
2258
2259         if (!write && !first && left && !err)
2260                 err = proc_put_char(&buffer, &left, '\n');
2261         if (write && !err && left)
2262                 left -= proc_skip_spaces(&p);
2263         if (write) {
2264                 kfree(kbuf);
2265                 if (first)
2266                         return err ? : -EINVAL;
2267         }
2268         *lenp -= left;
2269 out:
2270         *ppos += *lenp;
2271         return err;
2272 }
2273
2274 static int do_proc_dointvec(struct ctl_table *table, int write,
2275                   void __user *buffer, size_t *lenp, loff_t *ppos,
2276                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2277                               int write, void *data),
2278                   void *data)
2279 {
2280         return __do_proc_dointvec(table->data, table, write,
2281                         buffer, lenp, ppos, conv, data);
2282 }
2283
2284 static int do_proc_douintvec_w(unsigned int *tbl_data,
2285                                struct ctl_table *table,
2286                                void __user *buffer,
2287                                size_t *lenp, loff_t *ppos,
2288                                int (*conv)(unsigned long *lvalp,
2289                                            unsigned int *valp,
2290                                            int write, void *data),
2291                                void *data)
2292 {
2293         unsigned long lval;
2294         int err = 0;
2295         size_t left;
2296         bool neg;
2297         char *kbuf = NULL, *p;
2298
2299         left = *lenp;
2300
2301         if (proc_first_pos_non_zero_ignore(ppos, table))
2302                 goto bail_early;
2303
2304         if (left > PAGE_SIZE - 1)
2305                 left = PAGE_SIZE - 1;
2306
2307         p = kbuf = memdup_user_nul(buffer, left);
2308         if (IS_ERR(kbuf))
2309                 return -EINVAL;
2310
2311         left -= proc_skip_spaces(&p);
2312         if (!left) {
2313                 err = -EINVAL;
2314                 goto out_free;
2315         }
2316
2317         err = proc_get_long(&p, &left, &lval, &neg,
2318                              proc_wspace_sep,
2319                              sizeof(proc_wspace_sep), NULL);
2320         if (err || neg) {
2321                 err = -EINVAL;
2322                 goto out_free;
2323         }
2324
2325         if (conv(&lval, tbl_data, 1, data)) {
2326                 err = -EINVAL;
2327                 goto out_free;
2328         }
2329
2330         if (!err && left)
2331                 left -= proc_skip_spaces(&p);
2332
2333 out_free:
2334         kfree(kbuf);
2335         if (err)
2336                 return -EINVAL;
2337
2338         return 0;
2339
2340         /* This is in keeping with old __do_proc_dointvec() */
2341 bail_early:
2342         *ppos += *lenp;
2343         return err;
2344 }
2345
2346 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2347                                size_t *lenp, loff_t *ppos,
2348                                int (*conv)(unsigned long *lvalp,
2349                                            unsigned int *valp,
2350                                            int write, void *data),
2351                                void *data)
2352 {
2353         unsigned long lval;
2354         int err = 0;
2355         size_t left;
2356
2357         left = *lenp;
2358
2359         if (conv(&lval, tbl_data, 0, data)) {
2360                 err = -EINVAL;
2361                 goto out;
2362         }
2363
2364         err = proc_put_long(&buffer, &left, lval, false);
2365         if (err || !left)
2366                 goto out;
2367
2368         err = proc_put_char(&buffer, &left, '\n');
2369
2370 out:
2371         *lenp -= left;
2372         *ppos += *lenp;
2373
2374         return err;
2375 }
2376
2377 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2378                                int write, void __user *buffer,
2379                                size_t *lenp, loff_t *ppos,
2380                                int (*conv)(unsigned long *lvalp,
2381                                            unsigned int *valp,
2382                                            int write, void *data),
2383                                void *data)
2384 {
2385         unsigned int *i, vleft;
2386
2387         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2388                 *lenp = 0;
2389                 return 0;
2390         }
2391
2392         i = (unsigned int *) tbl_data;
2393         vleft = table->maxlen / sizeof(*i);
2394
2395         /*
2396          * Arrays are not supported, keep this simple. *Do not* add
2397          * support for them.
2398          */
2399         if (vleft != 1) {
2400                 *lenp = 0;
2401                 return -EINVAL;
2402         }
2403
2404         if (!conv)
2405                 conv = do_proc_douintvec_conv;
2406
2407         if (write)
2408                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2409                                            conv, data);
2410         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2411 }
2412
2413 static int do_proc_douintvec(struct ctl_table *table, int write,
2414                              void __user *buffer, size_t *lenp, loff_t *ppos,
2415                              int (*conv)(unsigned long *lvalp,
2416                                          unsigned int *valp,
2417                                          int write, void *data),
2418                              void *data)
2419 {
2420         return __do_proc_douintvec(table->data, table, write,
2421                                    buffer, lenp, ppos, conv, data);
2422 }
2423
2424 /**
2425  * proc_dointvec - read a vector of integers
2426  * @table: the sysctl table
2427  * @write: %TRUE if this is a write to the sysctl file
2428  * @buffer: the user buffer
2429  * @lenp: the size of the user buffer
2430  * @ppos: file position
2431  *
2432  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2433  * values from/to the user buffer, treated as an ASCII string.
2434  *
2435  * Returns 0 on success.
2436  */
2437 int proc_dointvec(struct ctl_table *table, int write,
2438                      void __user *buffer, size_t *lenp, loff_t *ppos)
2439 {
2440         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2441 }
2442
2443 /**
2444  * proc_douintvec - read a vector of unsigned integers
2445  * @table: the sysctl table
2446  * @write: %TRUE if this is a write to the sysctl file
2447  * @buffer: the user buffer
2448  * @lenp: the size of the user buffer
2449  * @ppos: file position
2450  *
2451  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2452  * values from/to the user buffer, treated as an ASCII string.
2453  *
2454  * Returns 0 on success.
2455  */
2456 int proc_douintvec(struct ctl_table *table, int write,
2457                      void __user *buffer, size_t *lenp, loff_t *ppos)
2458 {
2459         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2460                                  do_proc_douintvec_conv, NULL);
2461 }
2462
2463 /*
2464  * Taint values can only be increased
2465  * This means we can safely use a temporary.
2466  */
2467 static int proc_taint(struct ctl_table *table, int write,
2468                                void __user *buffer, size_t *lenp, loff_t *ppos)
2469 {
2470         struct ctl_table t;
2471         unsigned long tmptaint = get_taint();
2472         int err;
2473
2474         if (write && !capable(CAP_SYS_ADMIN))
2475                 return -EPERM;
2476
2477         t = *table;
2478         t.data = &tmptaint;
2479         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2480         if (err < 0)
2481                 return err;
2482
2483         if (write) {
2484                 /*
2485                  * Poor man's atomic or. Not worth adding a primitive
2486                  * to everyone's atomic.h for this
2487                  */
2488                 int i;
2489                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2490                         if ((tmptaint >> i) & 1)
2491                                 add_taint(i, LOCKDEP_STILL_OK);
2492                 }
2493         }
2494
2495         return err;
2496 }
2497
2498 #ifdef CONFIG_PRINTK
2499 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2500                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2501 {
2502         if (write && !capable(CAP_SYS_ADMIN))
2503                 return -EPERM;
2504
2505         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2506 }
2507 #endif
2508
2509 struct do_proc_dointvec_minmax_conv_param {
2510         int *min;
2511         int *max;
2512 };
2513
2514 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2515                                         int *valp,
2516                                         int write, void *data)
2517 {
2518         struct do_proc_dointvec_minmax_conv_param *param = data;
2519         if (write) {
2520                 int val = *negp ? -*lvalp : *lvalp;
2521                 if ((param->min && *param->min > val) ||
2522                     (param->max && *param->max < val))
2523                         return -EINVAL;
2524                 *valp = val;
2525         } else {
2526                 int val = *valp;
2527                 if (val < 0) {
2528                         *negp = true;
2529                         *lvalp = -(unsigned long)val;
2530                 } else {
2531                         *negp = false;
2532                         *lvalp = (unsigned long)val;
2533                 }
2534         }
2535         return 0;
2536 }
2537
2538 /**
2539  * proc_dointvec_minmax - read a vector of integers with min/max values
2540  * @table: the sysctl table
2541  * @write: %TRUE if this is a write to the sysctl file
2542  * @buffer: the user buffer
2543  * @lenp: the size of the user buffer
2544  * @ppos: file position
2545  *
2546  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2547  * values from/to the user buffer, treated as an ASCII string.
2548  *
2549  * This routine will ensure the values are within the range specified by
2550  * table->extra1 (min) and table->extra2 (max).
2551  *
2552  * Returns 0 on success.
2553  */
2554 int proc_dointvec_minmax(struct ctl_table *table, int write,
2555                   void __user *buffer, size_t *lenp, loff_t *ppos)
2556 {
2557         struct do_proc_dointvec_minmax_conv_param param = {
2558                 .min = (int *) table->extra1,
2559                 .max = (int *) table->extra2,
2560         };
2561         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2562                                 do_proc_dointvec_minmax_conv, &param);
2563 }
2564
2565 struct do_proc_douintvec_minmax_conv_param {
2566         unsigned int *min;
2567         unsigned int *max;
2568 };
2569
2570 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2571                                          unsigned int *valp,
2572                                          int write, void *data)
2573 {
2574         struct do_proc_douintvec_minmax_conv_param *param = data;
2575
2576         if (write) {
2577                 unsigned int val = *lvalp;
2578
2579                 if (*lvalp > UINT_MAX)
2580                         return -EINVAL;
2581
2582                 if ((param->min && *param->min > val) ||
2583                     (param->max && *param->max < val))
2584                         return -ERANGE;
2585
2586                 *valp = val;
2587         } else {
2588                 unsigned int val = *valp;
2589                 *lvalp = (unsigned long) val;
2590         }
2591
2592         return 0;
2593 }
2594
2595 /**
2596  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2597  * @table: the sysctl table
2598  * @write: %TRUE if this is a write to the sysctl file
2599  * @buffer: the user buffer
2600  * @lenp: the size of the user buffer
2601  * @ppos: file position
2602  *
2603  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2604  * values from/to the user buffer, treated as an ASCII string. Negative
2605  * strings are not allowed.
2606  *
2607  * This routine will ensure the values are within the range specified by
2608  * table->extra1 (min) and table->extra2 (max). There is a final sanity
2609  * check for UINT_MAX to avoid having to support wrap around uses from
2610  * userspace.
2611  *
2612  * Returns 0 on success.
2613  */
2614 int proc_douintvec_minmax(struct ctl_table *table, int write,
2615                           void __user *buffer, size_t *lenp, loff_t *ppos)
2616 {
2617         struct do_proc_douintvec_minmax_conv_param param = {
2618                 .min = (unsigned int *) table->extra1,
2619                 .max = (unsigned int *) table->extra2,
2620         };
2621         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2622                                  do_proc_douintvec_minmax_conv, &param);
2623 }
2624
2625 struct do_proc_dopipe_max_size_conv_param {
2626         unsigned int *min;
2627 };
2628
2629 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2630                                         unsigned int *valp,
2631                                         int write, void *data)
2632 {
2633         struct do_proc_dopipe_max_size_conv_param *param = data;
2634
2635         if (write) {
2636                 unsigned int val;
2637
2638                 if (*lvalp > UINT_MAX)
2639                         return -EINVAL;
2640
2641                 val = round_pipe_size(*lvalp);
2642                 if (val == 0)
2643                         return -EINVAL;
2644
2645                 if (param->min && *param->min > val)
2646                         return -ERANGE;
2647
2648                 *valp = val;
2649         } else {
2650                 unsigned int val = *valp;
2651                 *lvalp = (unsigned long) val;
2652         }
2653
2654         return 0;
2655 }
2656
2657 int proc_dopipe_max_size(struct ctl_table *table, int write,
2658                          void __user *buffer, size_t *lenp, loff_t *ppos)
2659 {
2660         struct do_proc_dopipe_max_size_conv_param param = {
2661                 .min = (unsigned int *) table->extra1,
2662         };
2663         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2664                                  do_proc_dopipe_max_size_conv, &param);
2665 }
2666
2667 static void validate_coredump_safety(void)
2668 {
2669 #ifdef CONFIG_COREDUMP
2670         if (suid_dumpable == SUID_DUMP_ROOT &&
2671             core_pattern[0] != '/' && core_pattern[0] != '|') {
2672                 printk(KERN_WARNING
2673 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2674 "Pipe handler or fully qualified core dump path required.\n"
2675 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2676                 );
2677         }
2678 #endif
2679 }
2680
2681 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2682                 void __user *buffer, size_t *lenp, loff_t *ppos)
2683 {
2684         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2685         if (!error)
2686                 validate_coredump_safety();
2687         return error;
2688 }
2689
2690 #ifdef CONFIG_COREDUMP
2691 static int proc_dostring_coredump(struct ctl_table *table, int write,
2692                   void __user *buffer, size_t *lenp, loff_t *ppos)
2693 {
2694         int error = proc_dostring(table, write, buffer, lenp, ppos);
2695         if (!error)
2696                 validate_coredump_safety();
2697         return error;
2698 }
2699 #endif
2700
2701 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2702                                      void __user *buffer,
2703                                      size_t *lenp, loff_t *ppos,
2704                                      unsigned long convmul,
2705                                      unsigned long convdiv)
2706 {
2707         unsigned long *i, *min, *max;
2708         int vleft, first = 1, err = 0;
2709         size_t left;
2710         char *kbuf = NULL, *p;
2711
2712         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2713                 *lenp = 0;
2714                 return 0;
2715         }
2716
2717         i = (unsigned long *) data;
2718         min = (unsigned long *) table->extra1;
2719         max = (unsigned long *) table->extra2;
2720         vleft = table->maxlen / sizeof(unsigned long);
2721         left = *lenp;
2722
2723         if (write) {
2724                 if (proc_first_pos_non_zero_ignore(ppos, table))
2725                         goto out;
2726
2727                 if (left > PAGE_SIZE - 1)
2728                         left = PAGE_SIZE - 1;
2729                 p = kbuf = memdup_user_nul(buffer, left);
2730                 if (IS_ERR(kbuf))
2731                         return PTR_ERR(kbuf);
2732         }
2733
2734         for (; left && vleft--; i++, first = 0) {
2735                 unsigned long val;
2736
2737                 if (write) {
2738                         bool neg;
2739
2740                         left -= proc_skip_spaces(&p);
2741
2742                         err = proc_get_long(&p, &left, &val, &neg,
2743                                              proc_wspace_sep,
2744                                              sizeof(proc_wspace_sep), NULL);
2745                         if (err)
2746                                 break;
2747                         if (neg)
2748                                 continue;
2749                         val = convmul * val / convdiv;
2750                         if ((min && val < *min) || (max && val > *max))
2751                                 continue;
2752                         *i = val;
2753                 } else {
2754                         val = convdiv * (*i) / convmul;
2755                         if (!first) {
2756                                 err = proc_put_char(&buffer, &left, '\t');
2757                                 if (err)
2758                                         break;
2759                         }
2760                         err = proc_put_long(&buffer, &left, val, false);
2761                         if (err)
2762                                 break;
2763                 }
2764         }
2765
2766         if (!write && !first && left && !err)
2767                 err = proc_put_char(&buffer, &left, '\n');
2768         if (write && !err)
2769                 left -= proc_skip_spaces(&p);
2770         if (write) {
2771                 kfree(kbuf);
2772                 if (first)
2773                         return err ? : -EINVAL;
2774         }
2775         *lenp -= left;
2776 out:
2777         *ppos += *lenp;
2778         return err;
2779 }
2780
2781 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2782                                      void __user *buffer,
2783                                      size_t *lenp, loff_t *ppos,
2784                                      unsigned long convmul,
2785                                      unsigned long convdiv)
2786 {
2787         return __do_proc_doulongvec_minmax(table->data, table, write,
2788                         buffer, lenp, ppos, convmul, convdiv);
2789 }
2790
2791 /**
2792  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2793  * @table: the sysctl table
2794  * @write: %TRUE if this is a write to the sysctl file
2795  * @buffer: the user buffer
2796  * @lenp: the size of the user buffer
2797  * @ppos: file position
2798  *
2799  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2800  * values from/to the user buffer, treated as an ASCII string.
2801  *
2802  * This routine will ensure the values are within the range specified by
2803  * table->extra1 (min) and table->extra2 (max).
2804  *
2805  * Returns 0 on success.
2806  */
2807 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2808                            void __user *buffer, size_t *lenp, loff_t *ppos)
2809 {
2810     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2811 }
2812
2813 /**
2814  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2815  * @table: the sysctl table
2816  * @write: %TRUE if this is a write to the sysctl file
2817  * @buffer: the user buffer
2818  * @lenp: the size of the user buffer
2819  * @ppos: file position
2820  *
2821  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2822  * values from/to the user buffer, treated as an ASCII string. The values
2823  * are treated as milliseconds, and converted to jiffies when they are stored.
2824  *
2825  * This routine will ensure the values are within the range specified by
2826  * table->extra1 (min) and table->extra2 (max).
2827  *
2828  * Returns 0 on success.
2829  */
2830 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2831                                       void __user *buffer,
2832                                       size_t *lenp, loff_t *ppos)
2833 {
2834     return do_proc_doulongvec_minmax(table, write, buffer,
2835                                      lenp, ppos, HZ, 1000l);
2836 }
2837
2838
2839 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2840                                          int *valp,
2841                                          int write, void *data)
2842 {
2843         if (write) {
2844                 if (*lvalp > INT_MAX / HZ)
2845                         return 1;
2846                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2847         } else {
2848                 int val = *valp;
2849                 unsigned long lval;
2850                 if (val < 0) {
2851                         *negp = true;
2852                         lval = -(unsigned long)val;
2853                 } else {
2854                         *negp = false;
2855                         lval = (unsigned long)val;
2856                 }
2857                 *lvalp = lval / HZ;
2858         }
2859         return 0;
2860 }
2861
2862 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2863                                                 int *valp,
2864                                                 int write, void *data)
2865 {
2866         if (write) {
2867                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2868                         return 1;
2869                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2870         } else {
2871                 int val = *valp;
2872                 unsigned long lval;
2873                 if (val < 0) {
2874                         *negp = true;
2875                         lval = -(unsigned long)val;
2876                 } else {
2877                         *negp = false;
2878                         lval = (unsigned long)val;
2879                 }
2880                 *lvalp = jiffies_to_clock_t(lval);
2881         }
2882         return 0;
2883 }
2884
2885 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2886                                             int *valp,
2887                                             int write, void *data)
2888 {
2889         if (write) {
2890                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2891
2892                 if (jif > INT_MAX)
2893                         return 1;
2894                 *valp = (int)jif;
2895         } else {
2896                 int val = *valp;
2897                 unsigned long lval;
2898                 if (val < 0) {
2899                         *negp = true;
2900                         lval = -(unsigned long)val;
2901                 } else {
2902                         *negp = false;
2903                         lval = (unsigned long)val;
2904                 }
2905                 *lvalp = jiffies_to_msecs(lval);
2906         }
2907         return 0;
2908 }
2909
2910 /**
2911  * proc_dointvec_jiffies - read a vector of integers as seconds
2912  * @table: the sysctl table
2913  * @write: %TRUE if this is a write to the sysctl file
2914  * @buffer: the user buffer
2915  * @lenp: the size of the user buffer
2916  * @ppos: file position
2917  *
2918  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2919  * values from/to the user buffer, treated as an ASCII string.
2920  * The values read are assumed to be in seconds, and are converted into
2921  * jiffies.
2922  *
2923  * Returns 0 on success.
2924  */
2925 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2926                           void __user *buffer, size_t *lenp, loff_t *ppos)
2927 {
2928     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2929                             do_proc_dointvec_jiffies_conv,NULL);
2930 }
2931
2932 /**
2933  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2934  * @table: the sysctl table
2935  * @write: %TRUE if this is a write to the sysctl file
2936  * @buffer: the user buffer
2937  * @lenp: the size of the user buffer
2938  * @ppos: pointer to the file position
2939  *
2940  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2941  * values from/to the user buffer, treated as an ASCII string.
2942  * The values read are assumed to be in 1/USER_HZ seconds, and
2943  * are converted into jiffies.
2944  *
2945  * Returns 0 on success.
2946  */
2947 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2948                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2949 {
2950     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2951                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2952 }
2953
2954 /**
2955  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2956  * @table: the sysctl table
2957  * @write: %TRUE if this is a write to the sysctl file
2958  * @buffer: the user buffer
2959  * @lenp: the size of the user buffer
2960  * @ppos: file position
2961  * @ppos: the current position in the file
2962  *
2963  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2964  * values from/to the user buffer, treated as an ASCII string.
2965  * The values read are assumed to be in 1/1000 seconds, and
2966  * are converted into jiffies.
2967  *
2968  * Returns 0 on success.
2969  */
2970 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2971                              void __user *buffer, size_t *lenp, loff_t *ppos)
2972 {
2973         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2974                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2975 }
2976
2977 static int proc_do_cad_pid(struct ctl_table *table, int write,
2978                            void __user *buffer, size_t *lenp, loff_t *ppos)
2979 {
2980         struct pid *new_pid;
2981         pid_t tmp;
2982         int r;
2983
2984         tmp = pid_vnr(cad_pid);
2985
2986         r = __do_proc_dointvec(&tmp, table, write, buffer,
2987                                lenp, ppos, NULL, NULL);
2988         if (r || !write)
2989                 return r;
2990
2991         new_pid = find_get_pid(tmp);
2992         if (!new_pid)
2993                 return -ESRCH;
2994
2995         put_pid(xchg(&cad_pid, new_pid));
2996         return 0;
2997 }
2998
2999 /**
3000  * proc_do_large_bitmap - read/write from/to a large bitmap
3001  * @table: the sysctl table
3002  * @write: %TRUE if this is a write to the sysctl file
3003  * @buffer: the user buffer
3004  * @lenp: the size of the user buffer
3005  * @ppos: file position
3006  *
3007  * The bitmap is stored at table->data and the bitmap length (in bits)
3008  * in table->maxlen.
3009  *
3010  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3011  * large bitmaps may be represented in a compact manner. Writing into
3012  * the file will clear the bitmap then update it with the given input.
3013  *
3014  * Returns 0 on success.
3015  */
3016 int proc_do_large_bitmap(struct ctl_table *table, int write,
3017                          void __user *buffer, size_t *lenp, loff_t *ppos)
3018 {
3019         int err = 0;
3020         bool first = 1;
3021         size_t left = *lenp;
3022         unsigned long bitmap_len = table->maxlen;
3023         unsigned long *bitmap = *(unsigned long **) table->data;
3024         unsigned long *tmp_bitmap = NULL;
3025         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3026
3027         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3028                 *lenp = 0;
3029                 return 0;
3030         }
3031
3032         if (write) {
3033                 char *kbuf, *p;
3034
3035                 if (left > PAGE_SIZE - 1)
3036                         left = PAGE_SIZE - 1;
3037
3038                 p = kbuf = memdup_user_nul(buffer, left);
3039                 if (IS_ERR(kbuf))
3040                         return PTR_ERR(kbuf);
3041
3042                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3043                                      GFP_KERNEL);
3044                 if (!tmp_bitmap) {
3045                         kfree(kbuf);
3046                         return -ENOMEM;
3047                 }
3048                 proc_skip_char(&p, &left, '\n');
3049                 while (!err && left) {
3050                         unsigned long val_a, val_b;
3051                         bool neg;
3052
3053                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3054                                              sizeof(tr_a), &c);
3055                         if (err)
3056                                 break;
3057                         if (val_a >= bitmap_len || neg) {
3058                                 err = -EINVAL;
3059                                 break;
3060                         }
3061
3062                         val_b = val_a;
3063                         if (left) {
3064                                 p++;
3065                                 left--;
3066                         }
3067
3068                         if (c == '-') {
3069                                 err = proc_get_long(&p, &left, &val_b,
3070                                                      &neg, tr_b, sizeof(tr_b),
3071                                                      &c);
3072                                 if (err)
3073                                         break;
3074                                 if (val_b >= bitmap_len || neg ||
3075                                     val_a > val_b) {
3076                                         err = -EINVAL;
3077                                         break;
3078                                 }
3079                                 if (left) {
3080                                         p++;
3081                                         left--;
3082                                 }
3083                         }
3084
3085                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3086                         first = 0;
3087                         proc_skip_char(&p, &left, '\n');
3088                 }
3089                 kfree(kbuf);
3090         } else {
3091                 unsigned long bit_a, bit_b = 0;
3092
3093                 while (left) {
3094                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3095                         if (bit_a >= bitmap_len)
3096                                 break;
3097                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
3098                                                    bit_a + 1) - 1;
3099
3100                         if (!first) {
3101                                 err = proc_put_char(&buffer, &left, ',');
3102                                 if (err)
3103                                         break;
3104                         }
3105                         err = proc_put_long(&buffer, &left, bit_a, false);
3106                         if (err)
3107                                 break;
3108                         if (bit_a != bit_b) {
3109                                 err = proc_put_char(&buffer, &left, '-');
3110                                 if (err)
3111                                         break;
3112                                 err = proc_put_long(&buffer, &left, bit_b, false);
3113                                 if (err)
3114                                         break;
3115                         }
3116
3117                         first = 0; bit_b++;
3118                 }
3119                 if (!err)
3120                         err = proc_put_char(&buffer, &left, '\n');
3121         }
3122
3123         if (!err) {
3124                 if (write) {
3125                         if (*ppos)
3126                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3127                         else
3128                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3129                 }
3130                 *lenp -= left;
3131                 *ppos += *lenp;
3132         }
3133
3134         kfree(tmp_bitmap);
3135         return err;
3136 }
3137
3138 #else /* CONFIG_PROC_SYSCTL */
3139
3140 int proc_dostring(struct ctl_table *table, int write,
3141                   void __user *buffer, size_t *lenp, loff_t *ppos)
3142 {
3143         return -ENOSYS;
3144 }
3145
3146 int proc_dointvec(struct ctl_table *table, int write,
3147                   void __user *buffer, size_t *lenp, loff_t *ppos)
3148 {
3149         return -ENOSYS;
3150 }
3151
3152 int proc_douintvec(struct ctl_table *table, int write,
3153                   void __user *buffer, size_t *lenp, loff_t *ppos)
3154 {
3155         return -ENOSYS;
3156 }
3157
3158 int proc_dointvec_minmax(struct ctl_table *table, int write,
3159                     void __user *buffer, size_t *lenp, loff_t *ppos)
3160 {
3161         return -ENOSYS;
3162 }
3163
3164 int proc_douintvec_minmax(struct ctl_table *table, int write,
3165                           void __user *buffer, size_t *lenp, loff_t *ppos)
3166 {
3167         return -ENOSYS;
3168 }
3169
3170 int proc_dopipe_max_size(struct ctl_table *table, int write,
3171                          void __user *buffer, size_t *lenp, loff_t *ppos)
3172 {
3173         return -ENOSYS;
3174 }
3175
3176 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3177                     void __user *buffer, size_t *lenp, loff_t *ppos)
3178 {
3179         return -ENOSYS;
3180 }
3181
3182 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3183                     void __user *buffer, size_t *lenp, loff_t *ppos)
3184 {
3185         return -ENOSYS;
3186 }
3187
3188 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3189                              void __user *buffer, size_t *lenp, loff_t *ppos)
3190 {
3191         return -ENOSYS;
3192 }
3193
3194 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3195                     void __user *buffer, size_t *lenp, loff_t *ppos)
3196 {
3197         return -ENOSYS;
3198 }
3199
3200 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3201                                       void __user *buffer,
3202                                       size_t *lenp, loff_t *ppos)
3203 {
3204     return -ENOSYS;
3205 }
3206
3207
3208 #endif /* CONFIG_PROC_SYSCTL */
3209
3210 /*
3211  * No sense putting this after each symbol definition, twice,
3212  * exception granted :-)
3213  */
3214 EXPORT_SYMBOL(proc_dointvec);
3215 EXPORT_SYMBOL(proc_douintvec);
3216 EXPORT_SYMBOL(proc_dointvec_jiffies);
3217 EXPORT_SYMBOL(proc_dointvec_minmax);
3218 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3219 EXPORT_SYMBOL_GPL(proc_dopipe_max_size);
3220 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3221 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3222 EXPORT_SYMBOL(proc_dostring);
3223 EXPORT_SYMBOL(proc_doulongvec_minmax);
3224 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);