1/* 2 * sysctl.c: General linux system control interface 3 * 4 * Begun 24 March 1995, Stephen Tweedie 5 * Added /proc support, Dec 1995 6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. 7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. 8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. 9 * Dynamic registration fixes, Stephen Tweedie. 10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. 11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris 12 * Horn. 13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. 14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. 15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill 16 * Wendling. 17 * The list_for_each() macro wasn't appropriate for the sysctl loop. 18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling 19 */ 20 21#include <linux/module.h> 22#include <linux/mm.h> 23#include <linux/swap.h> 24#include <linux/slab.h> 25#include <linux/sysctl.h> 26#include <linux/signal.h> 27#include <linux/proc_fs.h> 28#include <linux/security.h> 29#include <linux/ctype.h> 30#include <linux/kmemcheck.h> 31#include <linux/fs.h> 32#include <linux/init.h> 33#include <linux/kernel.h> 34#include <linux/kobject.h> 35#include <linux/net.h> 36#include <linux/sysrq.h> 37#include <linux/highuid.h> 38#include <linux/writeback.h> 39#include <linux/ratelimit.h> 40#include <linux/compaction.h> 41#include <linux/hugetlb.h> 42#include <linux/initrd.h> 43#include <linux/key.h> 44#include <linux/times.h> 45#include <linux/limits.h> 46#include <linux/dcache.h> 47#include <linux/dnotify.h> 48#include <linux/syscalls.h> 49#include <linux/vmstat.h> 50#include <linux/nfs_fs.h> 51#include <linux/acpi.h> 52#include <linux/reboot.h> 53#include <linux/ftrace.h> 54#include <linux/perf_event.h> 55#include <linux/kprobes.h> 56#include <linux/pipe_fs_i.h> 57#include <linux/oom.h> 58 59#include <asm/uaccess.h> 60#include <asm/processor.h> 61 62#ifdef CONFIG_X86 63#include <asm/nmi.h> 64#include <asm/stacktrace.h> 65#include <asm/io.h> 66#endif 67#ifdef CONFIG_BSD_PROCESS_ACCT 68#include <linux/acct.h> 69#endif 70#ifdef CONFIG_RT_MUTEXES 71#include <linux/rtmutex.h> 72#endif 73#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 74#include <linux/lockdep.h> 75#endif 76#ifdef CONFIG_CHR_DEV_SG 77#include <scsi/sg.h> 78#endif 79 80#ifdef CONFIG_LOCKUP_DETECTOR 81#include <linux/nmi.h> 82#endif 83 84 85#if defined(CONFIG_SYSCTL) 86 87/* External variables not in a header file. */ 88extern int sysctl_overcommit_memory; 89extern int sysctl_overcommit_ratio; 90extern int max_threads; 91extern int core_uses_pid; 92extern int suid_dumpable; 93extern char core_pattern[]; 94extern unsigned int core_pipe_limit; 95extern int pid_max; 96extern int min_free_kbytes; 97extern int pid_max_min, pid_max_max; 98extern int sysctl_drop_caches; 99extern int percpu_pagelist_fraction; 100extern int compat_log; 101extern int latencytop_enabled; 102extern int sysctl_nr_open_min, sysctl_nr_open_max; 103#ifndef CONFIG_MMU 104extern int sysctl_nr_trim_pages; 105#endif 106#ifdef CONFIG_BLOCK 107extern int blk_iopoll_enabled; 108#endif 109 110/* Constants used for minimum and maximum */ 111#ifdef CONFIG_LOCKUP_DETECTOR 112static int sixty = 60; 113static int neg_one = -1; 114#endif 115 116static int zero; 117static int __maybe_unused one = 1; 118static int __maybe_unused two = 2; 119static unsigned long one_ul = 1; 120static int one_hundred = 100; 121#ifdef CONFIG_PRINTK 122static int ten_thousand = 10000; 123#endif 124 125/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 126static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 127 128/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 129static int maxolduid = 65535; 130static int minolduid; 131static int min_percpu_pagelist_fract = 8; 132 133static int ngroups_max = NGROUPS_MAX; 134 135#ifdef CONFIG_INOTIFY_USER 136#include <linux/inotify.h> 137#endif 138#ifdef CONFIG_SPARC 139#include <asm/system.h> 140#endif 141 142#ifdef CONFIG_SPARC64 143extern int sysctl_tsb_ratio; 144#endif 145 146#ifdef __hppa__ 147extern int pwrsw_enabled; 148extern int unaligned_enabled; 149#endif 150 151#ifdef CONFIG_S390 152#ifdef CONFIG_MATHEMU 153extern int sysctl_ieee_emulation_warnings; 154#endif 155extern int sysctl_userprocess_debug; 156extern int spin_retry; 157#endif 158 159#ifdef CONFIG_IA64 160extern int no_unaligned_warning; 161extern int unaligned_dump_stack; 162#endif 163 164extern struct ratelimit_state printk_ratelimit_state; 165 166#ifdef CONFIG_PROC_SYSCTL 167static int proc_do_cad_pid(struct ctl_table *table, int write, 168 void __user *buffer, size_t *lenp, loff_t *ppos); 169static int proc_taint(struct ctl_table *table, int write, 170 void __user *buffer, size_t *lenp, loff_t *ppos); 171#endif 172 173#ifdef CONFIG_MAGIC_SYSRQ 174static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */ 175 176static int sysrq_sysctl_handler(ctl_table *table, int write, 177 void __user *buffer, size_t *lenp, 178 loff_t *ppos) 179{ 180 int error; 181 182 error = proc_dointvec(table, write, buffer, lenp, ppos); 183 if (error) 184 return error; 185 186 if (write) 187 sysrq_toggle_support(__sysrq_enabled); 188 189 return 0; 190} 191 192#endif 193 194static struct ctl_table root_table[]; 195static struct ctl_table_root sysctl_table_root; 196static struct ctl_table_header root_table_header = { 197 .count = 1, 198 .ctl_table = root_table, 199 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 200 .root = &sysctl_table_root, 201 .set = &sysctl_table_root.default_set, 202}; 203static struct ctl_table_root sysctl_table_root = { 204 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 205 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 206}; 207 208static struct ctl_table kern_table[]; 209static struct ctl_table vm_table[]; 210static struct ctl_table fs_table[]; 211static struct ctl_table debug_table[]; 212static struct ctl_table dev_table[]; 213extern struct ctl_table random_table[]; 214#ifdef CONFIG_EPOLL 215extern struct ctl_table epoll_table[]; 216#endif 217 218#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 219int sysctl_legacy_va_layout; 220#endif 221 222/* The default sysctl tables: */ 223 224static struct ctl_table root_table[] = { 225 { 226 .procname = "kernel", 227 .mode = 0555, 228 .child = kern_table, 229 }, 230 { 231 .procname = "vm", 232 .mode = 0555, 233 .child = vm_table, 234 }, 235 { 236 .procname = "fs", 237 .mode = 0555, 238 .child = fs_table, 239 }, 240 { 241 .procname = "debug", 242 .mode = 0555, 243 .child = debug_table, 244 }, 245 { 246 .procname = "dev", 247 .mode = 0555, 248 .child = dev_table, 249 }, 250/* 251 * NOTE: do not add new entries to this table unless you have read 252 * Documentation/sysctl/ctl_unnumbered.txt 253 */ 254 { } 255}; 256 257#ifdef CONFIG_SCHED_DEBUG 258static int min_sched_granularity_ns = 100000; /* 100 usecs */ 259static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 260static int min_wakeup_granularity_ns; /* 0 usecs */ 261static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 262static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 263static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 264static int min_sched_shares_ratelimit = 100000; /* 100 usec */ 265static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */ 266#endif 267 268#ifdef CONFIG_COMPACTION 269static int min_extfrag_threshold; 270static int max_extfrag_threshold = 1000; 271#endif 272 273static struct ctl_table kern_table[] = { 274 { 275 .procname = "sched_child_runs_first", 276 .data = &sysctl_sched_child_runs_first, 277 .maxlen = sizeof(unsigned int), 278 .mode = 0644, 279 .proc_handler = proc_dointvec, 280 }, 281#ifdef CONFIG_SCHED_DEBUG 282 { 283 .procname = "sched_min_granularity_ns", 284 .data = &sysctl_sched_min_granularity, 285 .maxlen = sizeof(unsigned int), 286 .mode = 0644, 287 .proc_handler = sched_proc_update_handler, 288 .extra1 = &min_sched_granularity_ns, 289 .extra2 = &max_sched_granularity_ns, 290 }, 291 { 292 .procname = "sched_latency_ns", 293 .data = &sysctl_sched_latency, 294 .maxlen = sizeof(unsigned int), 295 .mode = 0644, 296 .proc_handler = sched_proc_update_handler, 297 .extra1 = &min_sched_granularity_ns, 298 .extra2 = &max_sched_granularity_ns, 299 }, 300 { 301 .procname = "sched_wakeup_granularity_ns", 302 .data = &sysctl_sched_wakeup_granularity, 303 .maxlen = sizeof(unsigned int), 304 .mode = 0644, 305 .proc_handler = sched_proc_update_handler, 306 .extra1 = &min_wakeup_granularity_ns, 307 .extra2 = &max_wakeup_granularity_ns, 308 }, 309 { 310 .procname = "sched_shares_ratelimit", 311 .data = &sysctl_sched_shares_ratelimit, 312 .maxlen = sizeof(unsigned int), 313 .mode = 0644, 314 .proc_handler = sched_proc_update_handler, 315 .extra1 = &min_sched_shares_ratelimit, 316 .extra2 = &max_sched_shares_ratelimit, 317 }, 318 { 319 .procname = "sched_tunable_scaling", 320 .data = &sysctl_sched_tunable_scaling, 321 .maxlen = sizeof(enum sched_tunable_scaling), 322 .mode = 0644, 323 .proc_handler = sched_proc_update_handler, 324 .extra1 = &min_sched_tunable_scaling, 325 .extra2 = &max_sched_tunable_scaling, 326 }, 327 { 328 .procname = "sched_shares_thresh", 329 .data = &sysctl_sched_shares_thresh, 330 .maxlen = sizeof(unsigned int), 331 .mode = 0644, 332 .proc_handler = proc_dointvec_minmax, 333 .extra1 = &zero, 334 }, 335 { 336 .procname = "sched_migration_cost", 337 .data = &sysctl_sched_migration_cost, 338 .maxlen = sizeof(unsigned int), 339 .mode = 0644, 340 .proc_handler = proc_dointvec, 341 }, 342 { 343 .procname = "sched_nr_migrate", 344 .data = &sysctl_sched_nr_migrate, 345 .maxlen = sizeof(unsigned int), 346 .mode = 0644, 347 .proc_handler = proc_dointvec, 348 }, 349 { 350 .procname = "sched_time_avg", 351 .data = &sysctl_sched_time_avg, 352 .maxlen = sizeof(unsigned int), 353 .mode = 0644, 354 .proc_handler = proc_dointvec, 355 }, 356 { 357 .procname = "timer_migration", 358 .data = &sysctl_timer_migration, 359 .maxlen = sizeof(unsigned int), 360 .mode = 0644, 361 .proc_handler = proc_dointvec_minmax, 362 .extra1 = &zero, 363 .extra2 = &one, 364 }, 365#endif 366 { 367 .procname = "sched_rt_period_us", 368 .data = &sysctl_sched_rt_period, 369 .maxlen = sizeof(unsigned int), 370 .mode = 0644, 371 .proc_handler = sched_rt_handler, 372 }, 373 { 374 .procname = "sched_rt_runtime_us", 375 .data = &sysctl_sched_rt_runtime, 376 .maxlen = sizeof(int), 377 .mode = 0644, 378 .proc_handler = sched_rt_handler, 379 }, 380 { 381 .procname = "sched_compat_yield", 382 .data = &sysctl_sched_compat_yield, 383 .maxlen = sizeof(unsigned int), 384 .mode = 0644, 385 .proc_handler = proc_dointvec, 386 }, 387#ifdef CONFIG_PROVE_LOCKING 388 { 389 .procname = "prove_locking", 390 .data = &prove_locking, 391 .maxlen = sizeof(int), 392 .mode = 0644, 393 .proc_handler = proc_dointvec, 394 }, 395#endif 396#ifdef CONFIG_LOCK_STAT 397 { 398 .procname = "lock_stat", 399 .data = &lock_stat, 400 .maxlen = sizeof(int), 401 .mode = 0644, 402 .proc_handler = proc_dointvec, 403 }, 404#endif 405 { 406 .procname = "panic", 407 .data = &panic_timeout, 408 .maxlen = sizeof(int), 409 .mode = 0644, 410 .proc_handler = proc_dointvec, 411 }, 412 { 413 .procname = "core_uses_pid", 414 .data = &core_uses_pid, 415 .maxlen = sizeof(int), 416 .mode = 0644, 417 .proc_handler = proc_dointvec, 418 }, 419 { 420 .procname = "core_pattern", 421 .data = core_pattern, 422 .maxlen = CORENAME_MAX_SIZE, 423 .mode = 0644, 424 .proc_handler = proc_dostring, 425 }, 426 { 427 .procname = "core_pipe_limit", 428 .data = &core_pipe_limit, 429 .maxlen = sizeof(unsigned int), 430 .mode = 0644, 431 .proc_handler = proc_dointvec, 432 }, 433#ifdef CONFIG_PROC_SYSCTL 434 { 435 .procname = "tainted", 436 .maxlen = sizeof(long), 437 .mode = 0644, 438 .proc_handler = proc_taint, 439 }, 440#endif 441#ifdef CONFIG_LATENCYTOP 442 { 443 .procname = "latencytop", 444 .data = &latencytop_enabled, 445 .maxlen = sizeof(int), 446 .mode = 0644, 447 .proc_handler = proc_dointvec, 448 }, 449#endif 450#ifdef CONFIG_BLK_DEV_INITRD 451 { 452 .procname = "real-root-dev", 453 .data = &real_root_dev, 454 .maxlen = sizeof(int), 455 .mode = 0644, 456 .proc_handler = proc_dointvec, 457 }, 458#endif 459 { 460 .procname = "print-fatal-signals", 461 .data = &print_fatal_signals, 462 .maxlen = sizeof(int), 463 .mode = 0644, 464 .proc_handler = proc_dointvec, 465 }, 466#ifdef CONFIG_SPARC 467 { 468 .procname = "reboot-cmd", 469 .data = reboot_command, 470 .maxlen = 256, 471 .mode = 0644, 472 .proc_handler = proc_dostring, 473 }, 474 { 475 .procname = "stop-a", 476 .data = &stop_a_enabled, 477 .maxlen = sizeof (int), 478 .mode = 0644, 479 .proc_handler = proc_dointvec, 480 }, 481 { 482 .procname = "scons-poweroff", 483 .data = &scons_pwroff, 484 .maxlen = sizeof (int), 485 .mode = 0644, 486 .proc_handler = proc_dointvec, 487 }, 488#endif 489#ifdef CONFIG_SPARC64 490 { 491 .procname = "tsb-ratio", 492 .data = &sysctl_tsb_ratio, 493 .maxlen = sizeof (int), 494 .mode = 0644, 495 .proc_handler = proc_dointvec, 496 }, 497#endif 498#ifdef __hppa__ 499 { 500 .procname = "soft-power", 501 .data = &pwrsw_enabled, 502 .maxlen = sizeof (int), 503 .mode = 0644, 504 .proc_handler = proc_dointvec, 505 }, 506 { 507 .procname = "unaligned-trap", 508 .data = &unaligned_enabled, 509 .maxlen = sizeof (int), 510 .mode = 0644, 511 .proc_handler = proc_dointvec, 512 }, 513#endif 514 { 515 .procname = "ctrl-alt-del", 516 .data = &C_A_D, 517 .maxlen = sizeof(int), 518 .mode = 0644, 519 .proc_handler = proc_dointvec, 520 }, 521#ifdef CONFIG_FUNCTION_TRACER 522 { 523 .procname = "ftrace_enabled", 524 .data = &ftrace_enabled, 525 .maxlen = sizeof(int), 526 .mode = 0644, 527 .proc_handler = ftrace_enable_sysctl, 528 }, 529#endif 530#ifdef CONFIG_STACK_TRACER 531 { 532 .procname = "stack_tracer_enabled", 533 .data = &stack_tracer_enabled, 534 .maxlen = sizeof(int), 535 .mode = 0644, 536 .proc_handler = stack_trace_sysctl, 537 }, 538#endif 539#ifdef CONFIG_TRACING 540 { 541 .procname = "ftrace_dump_on_oops", 542 .data = &ftrace_dump_on_oops, 543 .maxlen = sizeof(int), 544 .mode = 0644, 545 .proc_handler = proc_dointvec, 546 }, 547#endif 548#ifdef CONFIG_MODULES 549 { 550 .procname = "modprobe", 551 .data = &modprobe_path, 552 .maxlen = KMOD_PATH_LEN, 553 .mode = 0644, 554 .proc_handler = proc_dostring, 555 }, 556 { 557 .procname = "modules_disabled", 558 .data = &modules_disabled, 559 .maxlen = sizeof(int), 560 .mode = 0644, 561 /* only handle a transition from default "0" to "1" */ 562 .proc_handler = proc_dointvec_minmax, 563 .extra1 = &one, 564 .extra2 = &one, 565 }, 566#endif 567#ifdef CONFIG_HOTPLUG 568 { 569 .procname = "hotplug", 570 .data = &uevent_helper, 571 .maxlen = UEVENT_HELPER_PATH_LEN, 572 .mode = 0644, 573 .proc_handler = proc_dostring, 574 }, 575#endif 576#ifdef CONFIG_CHR_DEV_SG 577 { 578 .procname = "sg-big-buff", 579 .data = &sg_big_buff, 580 .maxlen = sizeof (int), 581 .mode = 0444, 582 .proc_handler = proc_dointvec, 583 }, 584#endif 585#ifdef CONFIG_BSD_PROCESS_ACCT 586 { 587 .procname = "acct", 588 .data = &acct_parm, 589 .maxlen = 3*sizeof(int), 590 .mode = 0644, 591 .proc_handler = proc_dointvec, 592 }, 593#endif 594#ifdef CONFIG_MAGIC_SYSRQ 595 { 596 .procname = "sysrq", 597 .data = &__sysrq_enabled, 598 .maxlen = sizeof (int), 599 .mode = 0644, 600 .proc_handler = sysrq_sysctl_handler, 601 }, 602#endif 603#ifdef CONFIG_PROC_SYSCTL 604 { 605 .procname = "cad_pid", 606 .data = NULL, 607 .maxlen = sizeof (int), 608 .mode = 0600, 609 .proc_handler = proc_do_cad_pid, 610 }, 611#endif 612 { 613 .procname = "threads-max", 614 .data = &max_threads, 615 .maxlen = sizeof(int), 616 .mode = 0644, 617 .proc_handler = proc_dointvec, 618 }, 619 { 620 .procname = "random", 621 .mode = 0555, 622 .child = random_table, 623 }, 624 { 625 .procname = "overflowuid", 626 .data = &overflowuid, 627 .maxlen = sizeof(int), 628 .mode = 0644, 629 .proc_handler = proc_dointvec_minmax, 630 .extra1 = &minolduid, 631 .extra2 = &maxolduid, 632 }, 633 { 634 .procname = "overflowgid", 635 .data = &overflowgid, 636 .maxlen = sizeof(int), 637 .mode = 0644, 638 .proc_handler = proc_dointvec_minmax, 639 .extra1 = &minolduid, 640 .extra2 = &maxolduid, 641 }, 642#ifdef CONFIG_S390 643#ifdef CONFIG_MATHEMU 644 { 645 .procname = "ieee_emulation_warnings", 646 .data = &sysctl_ieee_emulation_warnings, 647 .maxlen = sizeof(int), 648 .mode = 0644, 649 .proc_handler = proc_dointvec, 650 }, 651#endif 652 { 653 .procname = "userprocess_debug", 654 .data = &show_unhandled_signals, 655 .maxlen = sizeof(int), 656 .mode = 0644, 657 .proc_handler = proc_dointvec, 658 }, 659#endif 660 { 661 .procname = "pid_max", 662 .data = &pid_max, 663 .maxlen = sizeof (int), 664 .mode = 0644, 665 .proc_handler = proc_dointvec_minmax, 666 .extra1 = &pid_max_min, 667 .extra2 = &pid_max_max, 668 }, 669 { 670 .procname = "panic_on_oops", 671 .data = &panic_on_oops, 672 .maxlen = sizeof(int), 673 .mode = 0644, 674 .proc_handler = proc_dointvec, 675 }, 676#if defined CONFIG_PRINTK 677 { 678 .procname = "printk", 679 .data = &console_loglevel, 680 .maxlen = 4*sizeof(int), 681 .mode = 0644, 682 .proc_handler = proc_dointvec, 683 }, 684 { 685 .procname = "printk_ratelimit", 686 .data = &printk_ratelimit_state.interval, 687 .maxlen = sizeof(int), 688 .mode = 0644, 689 .proc_handler = proc_dointvec_jiffies, 690 }, 691 { 692 .procname = "printk_ratelimit_burst", 693 .data = &printk_ratelimit_state.burst, 694 .maxlen = sizeof(int), 695 .mode = 0644, 696 .proc_handler = proc_dointvec, 697 }, 698 { 699 .procname = "printk_delay", 700 .data = &printk_delay_msec, 701 .maxlen = sizeof(int), 702 .mode = 0644, 703 .proc_handler = proc_dointvec_minmax, 704 .extra1 = &zero, 705 .extra2 = &ten_thousand, 706 }, 707#endif 708 { 709 .procname = "ngroups_max", 710 .data = &ngroups_max, 711 .maxlen = sizeof (int), 712 .mode = 0444, 713 .proc_handler = proc_dointvec, 714 }, 715#if defined(CONFIG_LOCKUP_DETECTOR) 716 { 717 .procname = "watchdog", 718 .data = &watchdog_enabled, 719 .maxlen = sizeof (int), 720 .mode = 0644, 721 .proc_handler = proc_dowatchdog_enabled, 722 }, 723 { 724 .procname = "watchdog_thresh", 725 .data = &softlockup_thresh, 726 .maxlen = sizeof(int), 727 .mode = 0644, 728 .proc_handler = proc_dowatchdog_thresh, 729 .extra1 = &neg_one, 730 .extra2 = &sixty, 731 }, 732 { 733 .procname = "softlockup_panic", 734 .data = &softlockup_panic, 735 .maxlen = sizeof(int), 736 .mode = 0644, 737 .proc_handler = proc_dointvec_minmax, 738 .extra1 = &zero, 739 .extra2 = &one, 740 }, 741#endif 742#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && \ 743 !defined(CONFIG_LOCKUP_DETECTOR) 744 { 745 .procname = "unknown_nmi_panic", 746 .data = &unknown_nmi_panic, 747 .maxlen = sizeof (int), 748 .mode = 0644, 749 .proc_handler = proc_dointvec, 750 }, 751 { 752 .procname = "nmi_watchdog", 753 .data = &nmi_watchdog_enabled, 754 .maxlen = sizeof (int), 755 .mode = 0644, 756 .proc_handler = proc_nmi_enabled, 757 }, 758#endif 759#if defined(CONFIG_X86) 760 { 761 .procname = "panic_on_unrecovered_nmi", 762 .data = &panic_on_unrecovered_nmi, 763 .maxlen = sizeof(int), 764 .mode = 0644, 765 .proc_handler = proc_dointvec, 766 }, 767 { 768 .procname = "panic_on_io_nmi", 769 .data = &panic_on_io_nmi, 770 .maxlen = sizeof(int), 771 .mode = 0644, 772 .proc_handler = proc_dointvec, 773 }, 774 { 775 .procname = "bootloader_type", 776 .data = &bootloader_type, 777 .maxlen = sizeof (int), 778 .mode = 0444, 779 .proc_handler = proc_dointvec, 780 }, 781 { 782 .procname = "bootloader_version", 783 .data = &bootloader_version, 784 .maxlen = sizeof (int), 785 .mode = 0444, 786 .proc_handler = proc_dointvec, 787 }, 788 { 789 .procname = "kstack_depth_to_print", 790 .data = &kstack_depth_to_print, 791 .maxlen = sizeof(int), 792 .mode = 0644, 793 .proc_handler = proc_dointvec, 794 }, 795 { 796 .procname = "io_delay_type", 797 .data = &io_delay_type, 798 .maxlen = sizeof(int), 799 .mode = 0644, 800 .proc_handler = proc_dointvec, 801 }, 802#endif 803#if defined(CONFIG_MMU) 804 { 805 .procname = "randomize_va_space", 806 .data = &randomize_va_space, 807 .maxlen = sizeof(int), 808 .mode = 0644, 809 .proc_handler = proc_dointvec, 810 }, 811#endif 812#if defined(CONFIG_S390) && defined(CONFIG_SMP) 813 { 814 .procname = "spin_retry", 815 .data = &spin_retry, 816 .maxlen = sizeof (int), 817 .mode = 0644, 818 .proc_handler = proc_dointvec, 819 }, 820#endif 821#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 822 { 823 .procname = "acpi_video_flags", 824 .data = &acpi_realmode_flags, 825 .maxlen = sizeof (unsigned long), 826 .mode = 0644, 827 .proc_handler = proc_doulongvec_minmax, 828 }, 829#endif 830#ifdef CONFIG_IA64 831 { 832 .procname = "ignore-unaligned-usertrap", 833 .data = &no_unaligned_warning, 834 .maxlen = sizeof (int), 835 .mode = 0644, 836 .proc_handler = proc_dointvec, 837 }, 838 { 839 .procname = "unaligned-dump-stack", 840 .data = &unaligned_dump_stack, 841 .maxlen = sizeof (int), 842 .mode = 0644, 843 .proc_handler = proc_dointvec, 844 }, 845#endif 846#ifdef CONFIG_DETECT_HUNG_TASK 847 { 848 .procname = "hung_task_panic", 849 .data = &sysctl_hung_task_panic, 850 .maxlen = sizeof(int), 851 .mode = 0644, 852 .proc_handler = proc_dointvec_minmax, 853 .extra1 = &zero, 854 .extra2 = &one, 855 }, 856 { 857 .procname = "hung_task_check_count", 858 .data = &sysctl_hung_task_check_count, 859 .maxlen = sizeof(unsigned long), 860 .mode = 0644, 861 .proc_handler = proc_doulongvec_minmax, 862 }, 863 { 864 .procname = "hung_task_timeout_secs", 865 .data = &sysctl_hung_task_timeout_secs, 866 .maxlen = sizeof(unsigned long), 867 .mode = 0644, 868 .proc_handler = proc_dohung_task_timeout_secs, 869 }, 870 { 871 .procname = "hung_task_warnings", 872 .data = &sysctl_hung_task_warnings, 873 .maxlen = sizeof(unsigned long), 874 .mode = 0644, 875 .proc_handler = proc_doulongvec_minmax, 876 }, 877#endif 878#ifdef CONFIG_COMPAT 879 { 880 .procname = "compat-log", 881 .data = &compat_log, 882 .maxlen = sizeof (int), 883 .mode = 0644, 884 .proc_handler = proc_dointvec, 885 }, 886#endif 887#ifdef CONFIG_RT_MUTEXES 888 { 889 .procname = "max_lock_depth", 890 .data = &max_lock_depth, 891 .maxlen = sizeof(int), 892 .mode = 0644, 893 .proc_handler = proc_dointvec, 894 }, 895#endif 896 { 897 .procname = "poweroff_cmd", 898 .data = &poweroff_cmd, 899 .maxlen = POWEROFF_CMD_PATH_LEN, 900 .mode = 0644, 901 .proc_handler = proc_dostring, 902 }, 903#ifdef CONFIG_KEYS 904 { 905 .procname = "keys", 906 .mode = 0555, 907 .child = key_sysctls, 908 }, 909#endif 910#ifdef CONFIG_RCU_TORTURE_TEST 911 { 912 .procname = "rcutorture_runnable", 913 .data = &rcutorture_runnable, 914 .maxlen = sizeof(int), 915 .mode = 0644, 916 .proc_handler = proc_dointvec, 917 }, 918#endif 919#ifdef CONFIG_PERF_EVENTS 920 { 921 .procname = "perf_event_paranoid", 922 .data = &sysctl_perf_event_paranoid, 923 .maxlen = sizeof(sysctl_perf_event_paranoid), 924 .mode = 0644, 925 .proc_handler = proc_dointvec, 926 }, 927 { 928 .procname = "perf_event_mlock_kb", 929 .data = &sysctl_perf_event_mlock, 930 .maxlen = sizeof(sysctl_perf_event_mlock), 931 .mode = 0644, 932 .proc_handler = proc_dointvec, 933 }, 934 { 935 .procname = "perf_event_max_sample_rate", 936 .data = &sysctl_perf_event_sample_rate, 937 .maxlen = sizeof(sysctl_perf_event_sample_rate), 938 .mode = 0644, 939 .proc_handler = proc_dointvec, 940 }, 941#endif 942#ifdef CONFIG_KMEMCHECK 943 { 944 .procname = "kmemcheck", 945 .data = &kmemcheck_enabled, 946 .maxlen = sizeof(int), 947 .mode = 0644, 948 .proc_handler = proc_dointvec, 949 }, 950#endif 951#ifdef CONFIG_BLOCK 952 { 953 .procname = "blk_iopoll", 954 .data = &blk_iopoll_enabled, 955 .maxlen = sizeof(int), 956 .mode = 0644, 957 .proc_handler = proc_dointvec, 958 }, 959#endif 960/* 961 * NOTE: do not add new entries to this table unless you have read 962 * Documentation/sysctl/ctl_unnumbered.txt 963 */ 964 { } 965}; 966 967static struct ctl_table vm_table[] = { 968 { 969 .procname = "overcommit_memory", 970 .data = &sysctl_overcommit_memory, 971 .maxlen = sizeof(sysctl_overcommit_memory), 972 .mode = 0644, 973 .proc_handler = proc_dointvec, 974 }, 975 { 976 .procname = "panic_on_oom", 977 .data = &sysctl_panic_on_oom, 978 .maxlen = sizeof(sysctl_panic_on_oom), 979 .mode = 0644, 980 .proc_handler = proc_dointvec, 981 }, 982 { 983 .procname = "oom_kill_allocating_task", 984 .data = &sysctl_oom_kill_allocating_task, 985 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 986 .mode = 0644, 987 .proc_handler = proc_dointvec, 988 }, 989 { 990 .procname = "oom_dump_tasks", 991 .data = &sysctl_oom_dump_tasks, 992 .maxlen = sizeof(sysctl_oom_dump_tasks), 993 .mode = 0644, 994 .proc_handler = proc_dointvec, 995 }, 996 { 997 .procname = "overcommit_ratio", 998 .data = &sysctl_overcommit_ratio, 999 .maxlen = sizeof(sysctl_overcommit_ratio), 1000 .mode = 0644, 1001 .proc_handler = proc_dointvec, 1002 }, 1003 { 1004 .procname = "page-cluster", 1005 .data = &page_cluster, 1006 .maxlen = sizeof(int), 1007 .mode = 0644, 1008 .proc_handler = proc_dointvec, 1009 }, 1010 { 1011 .procname = "dirty_background_ratio", 1012 .data = &dirty_background_ratio, 1013 .maxlen = sizeof(dirty_background_ratio), 1014 .mode = 0644, 1015 .proc_handler = dirty_background_ratio_handler, 1016 .extra1 = &zero, 1017 .extra2 = &one_hundred, 1018 }, 1019 { 1020 .procname = "dirty_background_bytes", 1021 .data = &dirty_background_bytes, 1022 .maxlen = sizeof(dirty_background_bytes), 1023 .mode = 0644, 1024 .proc_handler = dirty_background_bytes_handler, 1025 .extra1 = &one_ul, 1026 }, 1027 { 1028 .procname = "dirty_ratio", 1029 .data = &vm_dirty_ratio, 1030 .maxlen = sizeof(vm_dirty_ratio), 1031 .mode = 0644, 1032 .proc_handler = dirty_ratio_handler, 1033 .extra1 = &zero, 1034 .extra2 = &one_hundred, 1035 }, 1036 { 1037 .procname = "dirty_bytes", 1038 .data = &vm_dirty_bytes, 1039 .maxlen = sizeof(vm_dirty_bytes), 1040 .mode = 0644, 1041 .proc_handler = dirty_bytes_handler, 1042 .extra1 = &dirty_bytes_min, 1043 }, 1044 { 1045 .procname = "dirty_writeback_centisecs", 1046 .data = &dirty_writeback_interval, 1047 .maxlen = sizeof(dirty_writeback_interval), 1048 .mode = 0644, 1049 .proc_handler = dirty_writeback_centisecs_handler, 1050 }, 1051 { 1052 .procname = "dirty_expire_centisecs", 1053 .data = &dirty_expire_interval, 1054 .maxlen = sizeof(dirty_expire_interval), 1055 .mode = 0644, 1056 .proc_handler = proc_dointvec, 1057 }, 1058 { 1059 .procname = "nr_pdflush_threads", 1060 .data = &nr_pdflush_threads, 1061 .maxlen = sizeof nr_pdflush_threads, 1062 .mode = 0444 /* read-only*/, 1063 .proc_handler = proc_dointvec, 1064 }, 1065 { 1066 .procname = "swappiness", 1067 .data = &vm_swappiness, 1068 .maxlen = sizeof(vm_swappiness), 1069 .mode = 0644, 1070 .proc_handler = proc_dointvec_minmax, 1071 .extra1 = &zero, 1072 .extra2 = &one_hundred, 1073 }, 1074#ifdef CONFIG_HUGETLB_PAGE 1075 { 1076 .procname = "nr_hugepages", 1077 .data = NULL, 1078 .maxlen = sizeof(unsigned long), 1079 .mode = 0644, 1080 .proc_handler = hugetlb_sysctl_handler, 1081 .extra1 = (void *)&hugetlb_zero, 1082 .extra2 = (void *)&hugetlb_infinity, 1083 }, 1084#ifdef CONFIG_NUMA 1085 { 1086 .procname = "nr_hugepages_mempolicy", 1087 .data = NULL, 1088 .maxlen = sizeof(unsigned long), 1089 .mode = 0644, 1090 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1091 .extra1 = (void *)&hugetlb_zero, 1092 .extra2 = (void *)&hugetlb_infinity, 1093 }, 1094#endif 1095 { 1096 .procname = "hugetlb_shm_group", 1097 .data = &sysctl_hugetlb_shm_group, 1098 .maxlen = sizeof(gid_t), 1099 .mode = 0644, 1100 .proc_handler = proc_dointvec, 1101 }, 1102 { 1103 .procname = "hugepages_treat_as_movable", 1104 .data = &hugepages_treat_as_movable, 1105 .maxlen = sizeof(int), 1106 .mode = 0644, 1107 .proc_handler = hugetlb_treat_movable_handler, 1108 }, 1109 { 1110 .procname = "nr_overcommit_hugepages", 1111 .data = NULL, 1112 .maxlen = sizeof(unsigned long), 1113 .mode = 0644, 1114 .proc_handler = hugetlb_overcommit_handler, 1115 .extra1 = (void *)&hugetlb_zero, 1116 .extra2 = (void *)&hugetlb_infinity, 1117 }, 1118#endif 1119 { 1120 .procname = "lowmem_reserve_ratio", 1121 .data = &sysctl_lowmem_reserve_ratio, 1122 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1123 .mode = 0644, 1124 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1125 }, 1126 { 1127 .procname = "drop_caches", 1128 .data = &sysctl_drop_caches, 1129 .maxlen = sizeof(int), 1130 .mode = 0644, 1131 .proc_handler = drop_caches_sysctl_handler, 1132 }, 1133#ifdef CONFIG_COMPACTION 1134 { 1135 .procname = "compact_memory", 1136 .data = &sysctl_compact_memory, 1137 .maxlen = sizeof(int), 1138 .mode = 0200, 1139 .proc_handler = sysctl_compaction_handler, 1140 }, 1141 { 1142 .procname = "extfrag_threshold", 1143 .data = &sysctl_extfrag_threshold, 1144 .maxlen = sizeof(int), 1145 .mode = 0644, 1146 .proc_handler = sysctl_extfrag_handler, 1147 .extra1 = &min_extfrag_threshold, 1148 .extra2 = &max_extfrag_threshold, 1149 }, 1150 1151#endif /* CONFIG_COMPACTION */ 1152 { 1153 .procname = "min_free_kbytes", 1154 .data = &min_free_kbytes, 1155 .maxlen = sizeof(min_free_kbytes), 1156 .mode = 0644, 1157 .proc_handler = min_free_kbytes_sysctl_handler, 1158 .extra1 = &zero, 1159 }, 1160 { 1161 .procname = "percpu_pagelist_fraction", 1162 .data = &percpu_pagelist_fraction, 1163 .maxlen = sizeof(percpu_pagelist_fraction), 1164 .mode = 0644, 1165 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1166 .extra1 = &min_percpu_pagelist_fract, 1167 }, 1168#ifdef CONFIG_MMU 1169 { 1170 .procname = "max_map_count", 1171 .data = &sysctl_max_map_count, 1172 .maxlen = sizeof(sysctl_max_map_count), 1173 .mode = 0644, 1174 .proc_handler = proc_dointvec_minmax, 1175 .extra1 = &zero, 1176 }, 1177#else 1178 { 1179 .procname = "nr_trim_pages", 1180 .data = &sysctl_nr_trim_pages, 1181 .maxlen = sizeof(sysctl_nr_trim_pages), 1182 .mode = 0644, 1183 .proc_handler = proc_dointvec_minmax, 1184 .extra1 = &zero, 1185 }, 1186#endif 1187 { 1188 .procname = "laptop_mode", 1189 .data = &laptop_mode, 1190 .maxlen = sizeof(laptop_mode), 1191 .mode = 0644, 1192 .proc_handler = proc_dointvec_jiffies, 1193 }, 1194 { 1195 .procname = "block_dump", 1196 .data = &block_dump, 1197 .maxlen = sizeof(block_dump), 1198 .mode = 0644, 1199 .proc_handler = proc_dointvec, 1200 .extra1 = &zero, 1201 }, 1202 { 1203 .procname = "vfs_cache_pressure", 1204 .data = &sysctl_vfs_cache_pressure, 1205 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1206 .mode = 0644, 1207 .proc_handler = proc_dointvec, 1208 .extra1 = &zero, 1209 }, 1210#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1211 { 1212 .procname = "legacy_va_layout", 1213 .data = &sysctl_legacy_va_layout, 1214 .maxlen = sizeof(sysctl_legacy_va_layout), 1215 .mode = 0644, 1216 .proc_handler = proc_dointvec, 1217 .extra1 = &zero, 1218 }, 1219#endif 1220#ifdef CONFIG_NUMA 1221 { 1222 .procname = "zone_reclaim_mode", 1223 .data = &zone_reclaim_mode, 1224 .maxlen = sizeof(zone_reclaim_mode), 1225 .mode = 0644, 1226 .proc_handler = proc_dointvec, 1227 .extra1 = &zero, 1228 }, 1229 { 1230 .procname = "min_unmapped_ratio", 1231 .data = &sysctl_min_unmapped_ratio, 1232 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1233 .mode = 0644, 1234 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1235 .extra1 = &zero, 1236 .extra2 = &one_hundred, 1237 }, 1238 { 1239 .procname = "min_slab_ratio", 1240 .data = &sysctl_min_slab_ratio, 1241 .maxlen = sizeof(sysctl_min_slab_ratio), 1242 .mode = 0644, 1243 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1244 .extra1 = &zero, 1245 .extra2 = &one_hundred, 1246 }, 1247#endif 1248#ifdef CONFIG_SMP 1249 { 1250 .procname = "stat_interval", 1251 .data = &sysctl_stat_interval, 1252 .maxlen = sizeof(sysctl_stat_interval), 1253 .mode = 0644, 1254 .proc_handler = proc_dointvec_jiffies, 1255 }, 1256#endif 1257#ifdef CONFIG_MMU 1258 { 1259 .procname = "mmap_min_addr", 1260 .data = &dac_mmap_min_addr, 1261 .maxlen = sizeof(unsigned long), 1262 .mode = 0644, 1263 .proc_handler = mmap_min_addr_handler, 1264 }, 1265#endif 1266#ifdef CONFIG_NUMA 1267 { 1268 .procname = "numa_zonelist_order", 1269 .data = &numa_zonelist_order, 1270 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1271 .mode = 0644, 1272 .proc_handler = numa_zonelist_order_handler, 1273 }, 1274#endif 1275#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| (defined(CONFIG_SUPERH) && \ 1276 defined(CONFIG_VSYSCALL)) 1277 { 1278 .procname = "vdso_enabled", 1279 .data = &vdso_enabled, 1280 .maxlen = sizeof(vdso_enabled), 1281 .mode = 0644, 1282 .proc_handler = proc_dointvec, 1283 .extra1 = &zero, 1284 }, 1285#endif 1286#ifdef CONFIG_HIGHMEM 1287 { 1288 .procname = "highmem_is_dirtyable", 1289 .data = &vm_highmem_is_dirtyable, 1290 .maxlen = sizeof(vm_highmem_is_dirtyable), 1291 .mode = 0644, 1292 .proc_handler = proc_dointvec_minmax, 1293 .extra1 = &zero, 1294 .extra2 = &one, 1295 }, 1296#endif 1297 { 1298 .procname = "scan_unevictable_pages", 1299 .data = &scan_unevictable_pages, 1300 .maxlen = sizeof(scan_unevictable_pages), 1301 .mode = 0644, 1302 .proc_handler = scan_unevictable_handler, 1303 }, 1304#ifdef CONFIG_MEMORY_FAILURE 1305 { 1306 .procname = "memory_failure_early_kill", 1307 .data = &sysctl_memory_failure_early_kill, 1308 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1309 .mode = 0644, 1310 .proc_handler = proc_dointvec_minmax, 1311 .extra1 = &zero, 1312 .extra2 = &one, 1313 }, 1314 { 1315 .procname = "memory_failure_recovery", 1316 .data = &sysctl_memory_failure_recovery, 1317 .maxlen = sizeof(sysctl_memory_failure_recovery), 1318 .mode = 0644, 1319 .proc_handler = proc_dointvec_minmax, 1320 .extra1 = &zero, 1321 .extra2 = &one, 1322 }, 1323#endif 1324 1325/* 1326 * NOTE: do not add new entries to this table unless you have read 1327 * Documentation/sysctl/ctl_unnumbered.txt 1328 */ 1329 { } 1330}; 1331 1332#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1333static struct ctl_table binfmt_misc_table[] = { 1334 { } 1335}; 1336#endif 1337 1338static struct ctl_table fs_table[] = { 1339 { 1340 .procname = "inode-nr", 1341 .data = &inodes_stat, 1342 .maxlen = 2*sizeof(int), 1343 .mode = 0444, 1344 .proc_handler = proc_dointvec, 1345 }, 1346 { 1347 .procname = "inode-state", 1348 .data = &inodes_stat, 1349 .maxlen = 7*sizeof(int), 1350 .mode = 0444, 1351 .proc_handler = proc_dointvec, 1352 }, 1353 { 1354 .procname = "file-nr", 1355 .data = &files_stat, 1356 .maxlen = 3*sizeof(int), 1357 .mode = 0444, 1358 .proc_handler = proc_nr_files, 1359 }, 1360 { 1361 .procname = "file-max", 1362 .data = &files_stat.max_files, 1363 .maxlen = sizeof(int), 1364 .mode = 0644, 1365 .proc_handler = proc_dointvec, 1366 }, 1367 { 1368 .procname = "nr_open", 1369 .data = &sysctl_nr_open, 1370 .maxlen = sizeof(int), 1371 .mode = 0644, 1372 .proc_handler = proc_dointvec_minmax, 1373 .extra1 = &sysctl_nr_open_min, 1374 .extra2 = &sysctl_nr_open_max, 1375 }, 1376 { 1377 .procname = "dentry-state", 1378 .data = &dentry_stat, 1379 .maxlen = 6*sizeof(int), 1380 .mode = 0444, 1381 .proc_handler = proc_dointvec, 1382 }, 1383 { 1384 .procname = "overflowuid", 1385 .data = &fs_overflowuid, 1386 .maxlen = sizeof(int), 1387 .mode = 0644, 1388 .proc_handler = proc_dointvec_minmax, 1389 .extra1 = &minolduid, 1390 .extra2 = &maxolduid, 1391 }, 1392 { 1393 .procname = "overflowgid", 1394 .data = &fs_overflowgid, 1395 .maxlen = sizeof(int), 1396 .mode = 0644, 1397 .proc_handler = proc_dointvec_minmax, 1398 .extra1 = &minolduid, 1399 .extra2 = &maxolduid, 1400 }, 1401#ifdef CONFIG_FILE_LOCKING 1402 { 1403 .procname = "leases-enable", 1404 .data = &leases_enable, 1405 .maxlen = sizeof(int), 1406 .mode = 0644, 1407 .proc_handler = proc_dointvec, 1408 }, 1409#endif 1410#ifdef CONFIG_DNOTIFY 1411 { 1412 .procname = "dir-notify-enable", 1413 .data = &dir_notify_enable, 1414 .maxlen = sizeof(int), 1415 .mode = 0644, 1416 .proc_handler = proc_dointvec, 1417 }, 1418#endif 1419#ifdef CONFIG_MMU 1420#ifdef CONFIG_FILE_LOCKING 1421 { 1422 .procname = "lease-break-time", 1423 .data = &lease_break_time, 1424 .maxlen = sizeof(int), 1425 .mode = 0644, 1426 .proc_handler = proc_dointvec, 1427 }, 1428#endif 1429#ifdef CONFIG_AIO 1430 { 1431 .procname = "aio-nr", 1432 .data = &aio_nr, 1433 .maxlen = sizeof(aio_nr), 1434 .mode = 0444, 1435 .proc_handler = proc_doulongvec_minmax, 1436 }, 1437 { 1438 .procname = "aio-max-nr", 1439 .data = &aio_max_nr, 1440 .maxlen = sizeof(aio_max_nr), 1441 .mode = 0644, 1442 .proc_handler = proc_doulongvec_minmax, 1443 }, 1444#endif /* CONFIG_AIO */ 1445#ifdef CONFIG_INOTIFY_USER 1446 { 1447 .procname = "inotify", 1448 .mode = 0555, 1449 .child = inotify_table, 1450 }, 1451#endif 1452#ifdef CONFIG_EPOLL 1453 { 1454 .procname = "epoll", 1455 .mode = 0555, 1456 .child = epoll_table, 1457 }, 1458#endif 1459#endif 1460 { 1461 .procname = "suid_dumpable", 1462 .data = &suid_dumpable, 1463 .maxlen = sizeof(int), 1464 .mode = 0644, 1465 .proc_handler = proc_dointvec_minmax, 1466 .extra1 = &zero, 1467 .extra2 = &two, 1468 }, 1469#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1470 { 1471 .procname = "binfmt_misc", 1472 .mode = 0555, 1473 .child = binfmt_misc_table, 1474 }, 1475#endif 1476 { 1477 .procname = "pipe-max-size", 1478 .data = &pipe_max_size, 1479 .maxlen = sizeof(int), 1480 .mode = 0644, 1481 .proc_handler = &pipe_proc_fn, 1482 .extra1 = &pipe_min_size, 1483 }, 1484/* 1485 * NOTE: do not add new entries to this table unless you have read 1486 * Documentation/sysctl/ctl_unnumbered.txt 1487 */ 1488 { } 1489}; 1490 1491static struct ctl_table debug_table[] = { 1492#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1493 defined(CONFIG_S390) 1494 { 1495 .procname = "exception-trace", 1496 .data = &show_unhandled_signals, 1497 .maxlen = sizeof(int), 1498 .mode = 0644, 1499 .proc_handler = proc_dointvec 1500 }, 1501#endif 1502#if defined(CONFIG_OPTPROBES) 1503 { 1504 .procname = "kprobes-optimization", 1505 .data = &sysctl_kprobes_optimization, 1506 .maxlen = sizeof(int), 1507 .mode = 0644, 1508 .proc_handler = proc_kprobes_optimization_handler, 1509 .extra1 = &zero, 1510 .extra2 = &one, 1511 }, 1512#endif 1513 { } 1514}; 1515 1516static struct ctl_table dev_table[] = { 1517 { } 1518}; 1519 1520static DEFINE_SPINLOCK(sysctl_lock); 1521 1522/* called under sysctl_lock */ 1523static int use_table(struct ctl_table_header *p) 1524{ 1525 if (unlikely(p->unregistering)) 1526 return 0; 1527 p->used++; 1528 return 1; 1529} 1530 1531/* called under sysctl_lock */ 1532static void unuse_table(struct ctl_table_header *p) 1533{ 1534 if (!--p->used) 1535 if (unlikely(p->unregistering)) 1536 complete(p->unregistering); 1537} 1538 1539/* called under sysctl_lock, will reacquire if has to wait */ 1540static void start_unregistering(struct ctl_table_header *p) 1541{ 1542 /* 1543 * if p->used is 0, nobody will ever touch that entry again; 1544 * we'll eliminate all paths to it before dropping sysctl_lock 1545 */ 1546 if (unlikely(p->used)) { 1547 struct completion wait; 1548 init_completion(&wait); 1549 p->unregistering = &wait; 1550 spin_unlock(&sysctl_lock); 1551 wait_for_completion(&wait); 1552 spin_lock(&sysctl_lock); 1553 } else { 1554 /* anything non-NULL; we'll never dereference it */ 1555 p->unregistering = ERR_PTR(-EINVAL); 1556 } 1557 /* 1558 * do not remove from the list until nobody holds it; walking the 1559 * list in do_sysctl() relies on that. 1560 */ 1561 list_del_init(&p->ctl_entry); 1562} 1563 1564void sysctl_head_get(struct ctl_table_header *head) 1565{ 1566 spin_lock(&sysctl_lock); 1567 head->count++; 1568 spin_unlock(&sysctl_lock); 1569} 1570 1571void sysctl_head_put(struct ctl_table_header *head) 1572{ 1573 spin_lock(&sysctl_lock); 1574 if (!--head->count) 1575 kfree(head); 1576 spin_unlock(&sysctl_lock); 1577} 1578 1579struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1580{ 1581 if (!head) 1582 BUG(); 1583 spin_lock(&sysctl_lock); 1584 if (!use_table(head)) 1585 head = ERR_PTR(-ENOENT); 1586 spin_unlock(&sysctl_lock); 1587 return head; 1588} 1589 1590void sysctl_head_finish(struct ctl_table_header *head) 1591{ 1592 if (!head) 1593 return; 1594 spin_lock(&sysctl_lock); 1595 unuse_table(head); 1596 spin_unlock(&sysctl_lock); 1597} 1598 1599static struct ctl_table_set * 1600lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1601{ 1602 struct ctl_table_set *set = &root->default_set; 1603 if (root->lookup) 1604 set = root->lookup(root, namespaces); 1605 return set; 1606} 1607 1608static struct list_head * 1609lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1610{ 1611 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1612 return &set->list; 1613} 1614 1615struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1616 struct ctl_table_header *prev) 1617{ 1618 struct ctl_table_root *root; 1619 struct list_head *header_list; 1620 struct ctl_table_header *head; 1621 struct list_head *tmp; 1622 1623 spin_lock(&sysctl_lock); 1624 if (prev) { 1625 head = prev; 1626 tmp = &prev->ctl_entry; 1627 unuse_table(prev); 1628 goto next; 1629 } 1630 tmp = &root_table_header.ctl_entry; 1631 for (;;) { 1632 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1633 1634 if (!use_table(head)) 1635 goto next; 1636 spin_unlock(&sysctl_lock); 1637 return head; 1638 next: 1639 root = head->root; 1640 tmp = tmp->next; 1641 header_list = lookup_header_list(root, namespaces); 1642 if (tmp != header_list) 1643 continue; 1644 1645 do { 1646 root = list_entry(root->root_list.next, 1647 struct ctl_table_root, root_list); 1648 if (root == &sysctl_table_root) 1649 goto out; 1650 header_list = lookup_header_list(root, namespaces); 1651 } while (list_empty(header_list)); 1652 tmp = header_list->next; 1653 } 1654out: 1655 spin_unlock(&sysctl_lock); 1656 return NULL; 1657} 1658 1659struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1660{ 1661 return __sysctl_head_next(current->nsproxy, prev); 1662} 1663 1664void register_sysctl_root(struct ctl_table_root *root) 1665{ 1666 spin_lock(&sysctl_lock); 1667 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1668 spin_unlock(&sysctl_lock); 1669} 1670 1671/* 1672 * sysctl_perm does NOT grant the superuser all rights automatically, because 1673 * some sysctl variables are readonly even to root. 1674 */ 1675 1676static int test_perm(int mode, int op) 1677{ 1678 if (!current_euid()) 1679 mode >>= 6; 1680 else if (in_egroup_p(0)) 1681 mode >>= 3; 1682 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1683 return 0; 1684 return -EACCES; 1685} 1686 1687int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1688{ 1689 int error; 1690 int mode; 1691 1692 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1693 if (error) 1694 return error; 1695 1696 if (root->permissions) 1697 mode = root->permissions(root, current->nsproxy, table); 1698 else 1699 mode = table->mode; 1700 1701 return test_perm(mode, op); 1702} 1703 1704static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1705{ 1706 for (; table->procname; table++) { 1707 table->parent = parent; 1708 if (table->child) 1709 sysctl_set_parent(table, table->child); 1710 } 1711} 1712 1713static __init int sysctl_init(void) 1714{ 1715 sysctl_set_parent(NULL, root_table); 1716#ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1717 sysctl_check_table(current->nsproxy, root_table); 1718#endif 1719 return 0; 1720} 1721 1722core_initcall(sysctl_init); 1723 1724static struct ctl_table *is_branch_in(struct ctl_table *branch, 1725 struct ctl_table *table) 1726{ 1727 struct ctl_table *p; 1728 const char *s = branch->procname; 1729 1730 /* branch should have named subdirectory as its first element */ 1731 if (!s || !branch->child) 1732 return NULL; 1733 1734 /* ... and nothing else */ 1735 if (branch[1].procname) 1736 return NULL; 1737 1738 /* table should contain subdirectory with the same name */ 1739 for (p = table; p->procname; p++) { 1740 if (!p->child) 1741 continue; 1742 if (p->procname && strcmp(p->procname, s) == 0) 1743 return p; 1744 } 1745 return NULL; 1746} 1747 1748/* see if attaching q to p would be an improvement */ 1749static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1750{ 1751 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1752 struct ctl_table *next; 1753 int is_better = 0; 1754 int not_in_parent = !p->attached_by; 1755 1756 while ((next = is_branch_in(by, to)) != NULL) { 1757 if (by == q->attached_by) 1758 is_better = 1; 1759 if (to == p->attached_by) 1760 not_in_parent = 1; 1761 by = by->child; 1762 to = next->child; 1763 } 1764 1765 if (is_better && not_in_parent) { 1766 q->attached_by = by; 1767 q->attached_to = to; 1768 q->parent = p; 1769 } 1770} 1771 1772/** 1773 * __register_sysctl_paths - register a sysctl hierarchy 1774 * @root: List of sysctl headers to register on 1775 * @namespaces: Data to compute which lists of sysctl entries are visible 1776 * @path: The path to the directory the sysctl table is in. 1777 * @table: the top-level table structure 1778 * 1779 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1780 * array. A completely 0 filled entry terminates the table. 1781 * 1782 * The members of the &struct ctl_table structure are used as follows: 1783 * 1784 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1785 * enter a sysctl file 1786 * 1787 * data - a pointer to data for use by proc_handler 1788 * 1789 * maxlen - the maximum size in bytes of the data 1790 * 1791 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1792 * 1793 * child - a pointer to the child sysctl table if this entry is a directory, or 1794 * %NULL. 1795 * 1796 * proc_handler - the text handler routine (described below) 1797 * 1798 * de - for internal use by the sysctl routines 1799 * 1800 * extra1, extra2 - extra pointers usable by the proc handler routines 1801 * 1802 * Leaf nodes in the sysctl tree will be represented by a single file 1803 * under /proc; non-leaf nodes will be represented by directories. 1804 * 1805 * sysctl(2) can automatically manage read and write requests through 1806 * the sysctl table. The data and maxlen fields of the ctl_table 1807 * struct enable minimal validation of the values being written to be 1808 * performed, and the mode field allows minimal authentication. 1809 * 1810 * There must be a proc_handler routine for any terminal nodes 1811 * mirrored under /proc/sys (non-terminals are handled by a built-in 1812 * directory handler). Several default handlers are available to 1813 * cover common cases - 1814 * 1815 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1816 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1817 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1818 * 1819 * It is the handler's job to read the input buffer from user memory 1820 * and process it. The handler should return 0 on success. 1821 * 1822 * This routine returns %NULL on a failure to register, and a pointer 1823 * to the table header on success. 1824 */ 1825struct ctl_table_header *__register_sysctl_paths( 1826 struct ctl_table_root *root, 1827 struct nsproxy *namespaces, 1828 const struct ctl_path *path, struct ctl_table *table) 1829{ 1830 struct ctl_table_header *header; 1831 struct ctl_table *new, **prevp; 1832 unsigned int n, npath; 1833 struct ctl_table_set *set; 1834 1835 /* Count the path components */ 1836 for (npath = 0; path[npath].procname; ++npath) 1837 ; 1838 1839 /* 1840 * For each path component, allocate a 2-element ctl_table array. 1841 * The first array element will be filled with the sysctl entry 1842 * for this, the second will be the sentinel (procname == 0). 1843 * 1844 * We allocate everything in one go so that we don't have to 1845 * worry about freeing additional memory in unregister_sysctl_table. 1846 */ 1847 header = kzalloc(sizeof(struct ctl_table_header) + 1848 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1849 if (!header) 1850 return NULL; 1851 1852 new = (struct ctl_table *) (header + 1); 1853 1854 /* Now connect the dots */ 1855 prevp = &header->ctl_table; 1856 for (n = 0; n < npath; ++n, ++path) { 1857 /* Copy the procname */ 1858 new->procname = path->procname; 1859 new->mode = 0555; 1860 1861 *prevp = new; 1862 prevp = &new->child; 1863 1864 new += 2; 1865 } 1866 *prevp = table; 1867 header->ctl_table_arg = table; 1868 1869 INIT_LIST_HEAD(&header->ctl_entry); 1870 header->used = 0; 1871 header->unregistering = NULL; 1872 header->root = root; 1873 sysctl_set_parent(NULL, header->ctl_table); 1874 header->count = 1; 1875#ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1876 if (sysctl_check_table(namespaces, header->ctl_table)) { 1877 kfree(header); 1878 return NULL; 1879 } 1880#endif 1881 spin_lock(&sysctl_lock); 1882 header->set = lookup_header_set(root, namespaces); 1883 header->attached_by = header->ctl_table; 1884 header->attached_to = root_table; 1885 header->parent = &root_table_header; 1886 for (set = header->set; set; set = set->parent) { 1887 struct ctl_table_header *p; 1888 list_for_each_entry(p, &set->list, ctl_entry) { 1889 if (p->unregistering) 1890 continue; 1891 try_attach(p, header); 1892 } 1893 } 1894 header->parent->count++; 1895 list_add_tail(&header->ctl_entry, &header->set->list); 1896 spin_unlock(&sysctl_lock); 1897 1898 return header; 1899} 1900 1901/** 1902 * register_sysctl_table_path - register a sysctl table hierarchy 1903 * @path: The path to the directory the sysctl table is in. 1904 * @table: the top-level table structure 1905 * 1906 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1907 * array. A completely 0 filled entry terminates the table. 1908 * 1909 * See __register_sysctl_paths for more details. 1910 */ 1911struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1912 struct ctl_table *table) 1913{ 1914 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1915 path, table); 1916} 1917 1918/** 1919 * register_sysctl_table - register a sysctl table hierarchy 1920 * @table: the top-level table structure 1921 * 1922 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1923 * array. A completely 0 filled entry terminates the table. 1924 * 1925 * See register_sysctl_paths for more details. 1926 */ 1927struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1928{ 1929 static const struct ctl_path null_path[] = { {} }; 1930 1931 return register_sysctl_paths(null_path, table); 1932} 1933 1934/** 1935 * unregister_sysctl_table - unregister a sysctl table hierarchy 1936 * @header: the header returned from register_sysctl_table 1937 * 1938 * Unregisters the sysctl table and all children. proc entries may not 1939 * actually be removed until they are no longer used by anyone. 1940 */ 1941void unregister_sysctl_table(struct ctl_table_header * header) 1942{ 1943 might_sleep(); 1944 1945 if (header == NULL) 1946 return; 1947 1948 spin_lock(&sysctl_lock); 1949 start_unregistering(header); 1950 if (!--header->parent->count) { 1951 WARN_ON(1); 1952 kfree(header->parent); 1953 } 1954 if (!--header->count) 1955 kfree(header); 1956 spin_unlock(&sysctl_lock); 1957} 1958 1959int sysctl_is_seen(struct ctl_table_header *p) 1960{ 1961 struct ctl_table_set *set = p->set; 1962 int res; 1963 spin_lock(&sysctl_lock); 1964 if (p->unregistering) 1965 res = 0; 1966 else if (!set->is_seen) 1967 res = 1; 1968 else 1969 res = set->is_seen(set); 1970 spin_unlock(&sysctl_lock); 1971 return res; 1972} 1973 1974void setup_sysctl_set(struct ctl_table_set *p, 1975 struct ctl_table_set *parent, 1976 int (*is_seen)(struct ctl_table_set *)) 1977{ 1978 INIT_LIST_HEAD(&p->list); 1979 p->parent = parent ? parent : &sysctl_table_root.default_set; 1980 p->is_seen = is_seen; 1981} 1982 1983#else /* !CONFIG_SYSCTL */ 1984struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1985{ 1986 return NULL; 1987} 1988 1989struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1990 struct ctl_table *table) 1991{ 1992 return NULL; 1993} 1994 1995void unregister_sysctl_table(struct ctl_table_header * table) 1996{ 1997} 1998 1999void setup_sysctl_set(struct ctl_table_set *p, 2000 struct ctl_table_set *parent, 2001 int (*is_seen)(struct ctl_table_set *)) 2002{ 2003} 2004 2005void sysctl_head_put(struct ctl_table_header *head) 2006{ 2007} 2008 2009#endif /* CONFIG_SYSCTL */ 2010 2011/* 2012 * /proc/sys support 2013 */ 2014 2015#ifdef CONFIG_PROC_SYSCTL 2016 2017static int _proc_do_string(void* data, int maxlen, int write, 2018 void __user *buffer, 2019 size_t *lenp, loff_t *ppos) 2020{ 2021 size_t len; 2022 char __user *p; 2023 char c; 2024 2025 if (!data || !maxlen || !*lenp) { 2026 *lenp = 0; 2027 return 0; 2028 } 2029 2030 if (write) { 2031 len = 0; 2032 p = buffer; 2033 while (len < *lenp) { 2034 if (get_user(c, p++)) 2035 return -EFAULT; 2036 if (c == 0 || c == '\n') 2037 break; 2038 len++; 2039 } 2040 if (len >= maxlen) 2041 len = maxlen-1; 2042 if(copy_from_user(data, buffer, len)) 2043 return -EFAULT; 2044 ((char *) data)[len] = 0; 2045 *ppos += *lenp; 2046 } else { 2047 len = strlen(data); 2048 if (len > maxlen) 2049 len = maxlen; 2050 2051 if (*ppos > len) { 2052 *lenp = 0; 2053 return 0; 2054 } 2055 2056 data += *ppos; 2057 len -= *ppos; 2058 2059 if (len > *lenp) 2060 len = *lenp; 2061 if (len) 2062 if(copy_to_user(buffer, data, len)) 2063 return -EFAULT; 2064 if (len < *lenp) { 2065 if(put_user('\n', ((char __user *) buffer) + len)) 2066 return -EFAULT; 2067 len++; 2068 } 2069 *lenp = len; 2070 *ppos += len; 2071 } 2072 return 0; 2073} 2074 2075/** 2076 * proc_dostring - read a string sysctl 2077 * @table: the sysctl table 2078 * @write: %TRUE if this is a write to the sysctl file 2079 * @buffer: the user buffer 2080 * @lenp: the size of the user buffer 2081 * @ppos: file position 2082 * 2083 * Reads/writes a string from/to the user buffer. If the kernel 2084 * buffer provided is not large enough to hold the string, the 2085 * string is truncated. The copied string is %NULL-terminated. 2086 * If the string is being read by the user process, it is copied 2087 * and a newline '\n' is added. It is truncated if the buffer is 2088 * not large enough. 2089 * 2090 * Returns 0 on success. 2091 */ 2092int proc_dostring(struct ctl_table *table, int write, 2093 void __user *buffer, size_t *lenp, loff_t *ppos) 2094{ 2095 return _proc_do_string(table->data, table->maxlen, write, 2096 buffer, lenp, ppos); 2097} 2098 2099static size_t proc_skip_spaces(char **buf) 2100{ 2101 size_t ret; 2102 char *tmp = skip_spaces(*buf); 2103 ret = tmp - *buf; 2104 *buf = tmp; 2105 return ret; 2106} 2107 2108static void proc_skip_char(char **buf, size_t *size, const char v) 2109{ 2110 while (*size) { 2111 if (**buf != v) 2112 break; 2113 (*size)--; 2114 (*buf)++; 2115 } 2116} 2117 2118#define TMPBUFLEN 22 2119/** 2120 * proc_get_long - reads an ASCII formatted integer from a user buffer 2121 * 2122 * @buf: a kernel buffer 2123 * @size: size of the kernel buffer 2124 * @val: this is where the number will be stored 2125 * @neg: set to %TRUE if number is negative 2126 * @perm_tr: a vector which contains the allowed trailers 2127 * @perm_tr_len: size of the perm_tr vector 2128 * @tr: pointer to store the trailer character 2129 * 2130 * In case of success %0 is returned and @buf and @size are updated with 2131 * the amount of bytes read. If @tr is non-NULL and a trailing 2132 * character exists (size is non-zero after returning from this 2133 * function), @tr is updated with the trailing character. 2134 */ 2135static int proc_get_long(char **buf, size_t *size, 2136 unsigned long *val, bool *neg, 2137 const char *perm_tr, unsigned perm_tr_len, char *tr) 2138{ 2139 int len; 2140 char *p, tmp[TMPBUFLEN]; 2141 2142 if (!*size) 2143 return -EINVAL; 2144 2145 len = *size; 2146 if (len > TMPBUFLEN - 1) 2147 len = TMPBUFLEN - 1; 2148 2149 memcpy(tmp, *buf, len); 2150 2151 tmp[len] = 0; 2152 p = tmp; 2153 if (*p == '-' && *size > 1) { 2154 *neg = true; 2155 p++; 2156 } else 2157 *neg = false; 2158 if (!isdigit(*p)) 2159 return -EINVAL; 2160 2161 *val = simple_strtoul(p, &p, 0); 2162 2163 len = p - tmp; 2164 2165 /* We don't know if the next char is whitespace thus we may accept 2166 * invalid integers (e.g. 1234...a) or two integers instead of one 2167 * (e.g. 123...1). So lets not allow such large numbers. */ 2168 if (len == TMPBUFLEN - 1) 2169 return -EINVAL; 2170 2171 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2172 return -EINVAL; 2173 2174 if (tr && (len < *size)) 2175 *tr = *p; 2176 2177 *buf += len; 2178 *size -= len; 2179 2180 return 0; 2181} 2182 2183/** 2184 * proc_put_long - converts an integer to a decimal ASCII formatted string 2185 * 2186 * @buf: the user buffer 2187 * @size: the size of the user buffer 2188 * @val: the integer to be converted 2189 * @neg: sign of the number, %TRUE for negative 2190 * 2191 * In case of success %0 is returned and @buf and @size are updated with 2192 * the amount of bytes written. 2193 */ 2194static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2195 bool neg) 2196{ 2197 int len; 2198 char tmp[TMPBUFLEN], *p = tmp; 2199 2200 sprintf(p, "%s%lu", neg ? "-" : "", val); 2201 len = strlen(tmp); 2202 if (len > *size) 2203 len = *size; 2204 if (copy_to_user(*buf, tmp, len)) 2205 return -EFAULT; 2206 *size -= len; 2207 *buf += len; 2208 return 0; 2209} 2210#undef TMPBUFLEN 2211 2212static int proc_put_char(void __user **buf, size_t *size, char c) 2213{ 2214 if (*size) { 2215 char __user **buffer = (char __user **)buf; 2216 if (put_user(c, *buffer)) 2217 return -EFAULT; 2218 (*size)--, (*buffer)++; 2219 *buf = *buffer; 2220 } 2221 return 0; 2222} 2223 2224static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2225 int *valp, 2226 int write, void *data) 2227{ 2228 if (write) { 2229 *valp = *negp ? -*lvalp : *lvalp; 2230 } else { 2231 int val = *valp; 2232 if (val < 0) { 2233 *negp = true; 2234 *lvalp = (unsigned long)-val; 2235 } else { 2236 *negp = false; 2237 *lvalp = (unsigned long)val; 2238 } 2239 } 2240 return 0; 2241} 2242 2243static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2244 2245static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2246 int write, void __user *buffer, 2247 size_t *lenp, loff_t *ppos, 2248 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2249 int write, void *data), 2250 void *data) 2251{ 2252 int *i, vleft, first = 1, err = 0; 2253 unsigned long page = 0; 2254 size_t left; 2255 char *kbuf; 2256 2257 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2258 *lenp = 0; 2259 return 0; 2260 } 2261 2262 i = (int *) tbl_data; 2263 vleft = table->maxlen / sizeof(*i); 2264 left = *lenp; 2265 2266 if (!conv) 2267 conv = do_proc_dointvec_conv; 2268 2269 if (write) { 2270 if (left > PAGE_SIZE - 1) 2271 left = PAGE_SIZE - 1; 2272 page = __get_free_page(GFP_TEMPORARY); 2273 kbuf = (char *) page; 2274 if (!kbuf) 2275 return -ENOMEM; 2276 if (copy_from_user(kbuf, buffer, left)) { 2277 err = -EFAULT; 2278 goto free; 2279 } 2280 kbuf[left] = 0; 2281 } 2282 2283 for (; left && vleft--; i++, first=0) { 2284 unsigned long lval; 2285 bool neg; 2286 2287 if (write) { 2288 left -= proc_skip_spaces(&kbuf); 2289 2290 if (!left) 2291 break; 2292 err = proc_get_long(&kbuf, &left, &lval, &neg, 2293 proc_wspace_sep, 2294 sizeof(proc_wspace_sep), NULL); 2295 if (err) 2296 break; 2297 if (conv(&neg, &lval, i, 1, data)) { 2298 err = -EINVAL; 2299 break; 2300 } 2301 } else { 2302 if (conv(&neg, &lval, i, 0, data)) { 2303 err = -EINVAL; 2304 break; 2305 } 2306 if (!first) 2307 err = proc_put_char(&buffer, &left, '\t'); 2308 if (err) 2309 break; 2310 err = proc_put_long(&buffer, &left, lval, neg); 2311 if (err) 2312 break; 2313 } 2314 } 2315 2316 if (!write && !first && left && !err) 2317 err = proc_put_char(&buffer, &left, '\n'); 2318 if (write && !err && left) 2319 left -= proc_skip_spaces(&kbuf); 2320free: 2321 if (write) { 2322 free_page(page); 2323 if (first) 2324 return err ? : -EINVAL; 2325 } 2326 *lenp -= left; 2327 *ppos += *lenp; 2328 return err; 2329} 2330 2331static int do_proc_dointvec(struct ctl_table *table, int write, 2332 void __user *buffer, size_t *lenp, loff_t *ppos, 2333 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2334 int write, void *data), 2335 void *data) 2336{ 2337 return __do_proc_dointvec(table->data, table, write, 2338 buffer, lenp, ppos, conv, data); 2339} 2340 2341/** 2342 * proc_dointvec - read a vector of integers 2343 * @table: the sysctl table 2344 * @write: %TRUE if this is a write to the sysctl file 2345 * @buffer: the user buffer 2346 * @lenp: the size of the user buffer 2347 * @ppos: file position 2348 * 2349 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2350 * values from/to the user buffer, treated as an ASCII string. 2351 * 2352 * Returns 0 on success. 2353 */ 2354int proc_dointvec(struct ctl_table *table, int write, 2355 void __user *buffer, size_t *lenp, loff_t *ppos) 2356{ 2357 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2358 NULL,NULL); 2359} 2360 2361/* 2362 * Taint values can only be increased 2363 * This means we can safely use a temporary. 2364 */ 2365static int proc_taint(struct ctl_table *table, int write, 2366 void __user *buffer, size_t *lenp, loff_t *ppos) 2367{ 2368 struct ctl_table t; 2369 unsigned long tmptaint = get_taint(); 2370 int err; 2371 2372 if (write && !capable(CAP_SYS_ADMIN)) 2373 return -EPERM; 2374 2375 t = *table; 2376 t.data = &tmptaint; 2377 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2378 if (err < 0) 2379 return err; 2380 2381 if (write) { 2382 /* 2383 * Poor man's atomic or. Not worth adding a primitive 2384 * to everyone's atomic.h for this 2385 */ 2386 int i; 2387 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2388 if ((tmptaint >> i) & 1) 2389 add_taint(i); 2390 } 2391 } 2392 2393 return err; 2394} 2395 2396struct do_proc_dointvec_minmax_conv_param { 2397 int *min; 2398 int *max; 2399}; 2400 2401static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2402 int *valp, 2403 int write, void *data) 2404{ 2405 struct do_proc_dointvec_minmax_conv_param *param = data; 2406 if (write) { 2407 int val = *negp ? -*lvalp : *lvalp; 2408 if ((param->min && *param->min > val) || 2409 (param->max && *param->max < val)) 2410 return -EINVAL; 2411 *valp = val; 2412 } else { 2413 int val = *valp; 2414 if (val < 0) { 2415 *negp = true; 2416 *lvalp = (unsigned long)-val; 2417 } else { 2418 *negp = false; 2419 *lvalp = (unsigned long)val; 2420 } 2421 } 2422 return 0; 2423} 2424 2425/** 2426 * proc_dointvec_minmax - read a vector of integers with min/max values 2427 * @table: the sysctl table 2428 * @write: %TRUE if this is a write to the sysctl file 2429 * @buffer: the user buffer 2430 * @lenp: the size of the user buffer 2431 * @ppos: file position 2432 * 2433 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2434 * values from/to the user buffer, treated as an ASCII string. 2435 * 2436 * This routine will ensure the values are within the range specified by 2437 * table->extra1 (min) and table->extra2 (max). 2438 * 2439 * Returns 0 on success. 2440 */ 2441int proc_dointvec_minmax(struct ctl_table *table, int write, 2442 void __user *buffer, size_t *lenp, loff_t *ppos) 2443{ 2444 struct do_proc_dointvec_minmax_conv_param param = { 2445 .min = (int *) table->extra1, 2446 .max = (int *) table->extra2, 2447 }; 2448 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2449 do_proc_dointvec_minmax_conv, ¶m); 2450} 2451 2452static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2453 void __user *buffer, 2454 size_t *lenp, loff_t *ppos, 2455 unsigned long convmul, 2456 unsigned long convdiv) 2457{ 2458 unsigned long *i, *min, *max; 2459 int vleft, first = 1, err = 0; 2460 unsigned long page = 0; 2461 size_t left; 2462 char *kbuf; 2463 2464 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2465 *lenp = 0; 2466 return 0; 2467 } 2468 2469 i = (unsigned long *) data; 2470 min = (unsigned long *) table->extra1; 2471 max = (unsigned long *) table->extra2; 2472 vleft = table->maxlen / sizeof(unsigned long); 2473 left = *lenp; 2474 2475 if (write) { 2476 if (left > PAGE_SIZE - 1) 2477 left = PAGE_SIZE - 1; 2478 page = __get_free_page(GFP_TEMPORARY); 2479 kbuf = (char *) page; 2480 if (!kbuf) 2481 return -ENOMEM; 2482 if (copy_from_user(kbuf, buffer, left)) { 2483 err = -EFAULT; 2484 goto free; 2485 } 2486 kbuf[left] = 0; 2487 } 2488 2489 for (; left && vleft--; i++, first = 0) { 2490 unsigned long val; 2491 2492 if (write) { 2493 bool neg; 2494 2495 left -= proc_skip_spaces(&kbuf); 2496 2497 err = proc_get_long(&kbuf, &left, &val, &neg, 2498 proc_wspace_sep, 2499 sizeof(proc_wspace_sep), NULL); 2500 if (err) 2501 break; 2502 if (neg) 2503 continue; 2504 if ((min && val < *min) || (max && val > *max)) 2505 continue; 2506 *i = val; 2507 } else { 2508 val = convdiv * (*i) / convmul; 2509 if (!first) 2510 err = proc_put_char(&buffer, &left, '\t'); 2511 err = proc_put_long(&buffer, &left, val, false); 2512 if (err) 2513 break; 2514 } 2515 } 2516 2517 if (!write && !first && left && !err) 2518 err = proc_put_char(&buffer, &left, '\n'); 2519 if (write && !err) 2520 left -= proc_skip_spaces(&kbuf); 2521free: 2522 if (write) { 2523 free_page(page); 2524 if (first) 2525 return err ? : -EINVAL; 2526 } 2527 *lenp -= left; 2528 *ppos += *lenp; 2529 return err; 2530} 2531 2532static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2533 void __user *buffer, 2534 size_t *lenp, loff_t *ppos, 2535 unsigned long convmul, 2536 unsigned long convdiv) 2537{ 2538 return __do_proc_doulongvec_minmax(table->data, table, write, 2539 buffer, lenp, ppos, convmul, convdiv); 2540} 2541 2542/** 2543 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2544 * @table: the sysctl table 2545 * @write: %TRUE if this is a write to the sysctl file 2546 * @buffer: the user buffer 2547 * @lenp: the size of the user buffer 2548 * @ppos: file position 2549 * 2550 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2551 * values from/to the user buffer, treated as an ASCII string. 2552 * 2553 * This routine will ensure the values are within the range specified by 2554 * table->extra1 (min) and table->extra2 (max). 2555 * 2556 * Returns 0 on success. 2557 */ 2558int proc_doulongvec_minmax(struct ctl_table *table, int write, 2559 void __user *buffer, size_t *lenp, loff_t *ppos) 2560{ 2561 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2562} 2563 2564/** 2565 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2566 * @table: the sysctl table 2567 * @write: %TRUE if this is a write to the sysctl file 2568 * @buffer: the user buffer 2569 * @lenp: the size of the user buffer 2570 * @ppos: file position 2571 * 2572 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2573 * values from/to the user buffer, treated as an ASCII string. The values 2574 * are treated as milliseconds, and converted to jiffies when they are stored. 2575 * 2576 * This routine will ensure the values are within the range specified by 2577 * table->extra1 (min) and table->extra2 (max). 2578 * 2579 * Returns 0 on success. 2580 */ 2581int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2582 void __user *buffer, 2583 size_t *lenp, loff_t *ppos) 2584{ 2585 return do_proc_doulongvec_minmax(table, write, buffer, 2586 lenp, ppos, HZ, 1000l); 2587} 2588 2589 2590static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2591 int *valp, 2592 int write, void *data) 2593{ 2594 if (write) { 2595 if (*lvalp > LONG_MAX / HZ) 2596 return 1; 2597 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2598 } else { 2599 int val = *valp; 2600 unsigned long lval; 2601 if (val < 0) { 2602 *negp = true; 2603 lval = (unsigned long)-val; 2604 } else { 2605 *negp = false; 2606 lval = (unsigned long)val; 2607 } 2608 *lvalp = lval / HZ; 2609 } 2610 return 0; 2611} 2612 2613static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2614 int *valp, 2615 int write, void *data) 2616{ 2617 if (write) { 2618 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2619 return 1; 2620 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2621 } else { 2622 int val = *valp; 2623 unsigned long lval; 2624 if (val < 0) { 2625 *negp = true; 2626 lval = (unsigned long)-val; 2627 } else { 2628 *negp = false; 2629 lval = (unsigned long)val; 2630 } 2631 *lvalp = jiffies_to_clock_t(lval); 2632 } 2633 return 0; 2634} 2635 2636static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2637 int *valp, 2638 int write, void *data) 2639{ 2640 if (write) { 2641 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2642 } else { 2643 int val = *valp; 2644 unsigned long lval; 2645 if (val < 0) { 2646 *negp = true; 2647 lval = (unsigned long)-val; 2648 } else { 2649 *negp = false; 2650 lval = (unsigned long)val; 2651 } 2652 *lvalp = jiffies_to_msecs(lval); 2653 } 2654 return 0; 2655} 2656 2657/** 2658 * proc_dointvec_jiffies - read a vector of integers as seconds 2659 * @table: the sysctl table 2660 * @write: %TRUE if this is a write to the sysctl file 2661 * @buffer: the user buffer 2662 * @lenp: the size of the user buffer 2663 * @ppos: file position 2664 * 2665 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2666 * values from/to the user buffer, treated as an ASCII string. 2667 * The values read are assumed to be in seconds, and are converted into 2668 * jiffies. 2669 * 2670 * Returns 0 on success. 2671 */ 2672int proc_dointvec_jiffies(struct ctl_table *table, int write, 2673 void __user *buffer, size_t *lenp, loff_t *ppos) 2674{ 2675 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2676 do_proc_dointvec_jiffies_conv,NULL); 2677} 2678 2679/** 2680 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2681 * @table: the sysctl table 2682 * @write: %TRUE if this is a write to the sysctl file 2683 * @buffer: the user buffer 2684 * @lenp: the size of the user buffer 2685 * @ppos: pointer to the file position 2686 * 2687 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2688 * values from/to the user buffer, treated as an ASCII string. 2689 * The values read are assumed to be in 1/USER_HZ seconds, and 2690 * are converted into jiffies. 2691 * 2692 * Returns 0 on success. 2693 */ 2694int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2695 void __user *buffer, size_t *lenp, loff_t *ppos) 2696{ 2697 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2698 do_proc_dointvec_userhz_jiffies_conv,NULL); 2699} 2700 2701/** 2702 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2703 * @table: the sysctl table 2704 * @write: %TRUE if this is a write to the sysctl file 2705 * @buffer: the user buffer 2706 * @lenp: the size of the user buffer 2707 * @ppos: file position 2708 * @ppos: the current position in the file 2709 * 2710 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2711 * values from/to the user buffer, treated as an ASCII string. 2712 * The values read are assumed to be in 1/1000 seconds, and 2713 * are converted into jiffies. 2714 * 2715 * Returns 0 on success. 2716 */ 2717int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2718 void __user *buffer, size_t *lenp, loff_t *ppos) 2719{ 2720 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2721 do_proc_dointvec_ms_jiffies_conv, NULL); 2722} 2723 2724static int proc_do_cad_pid(struct ctl_table *table, int write, 2725 void __user *buffer, size_t *lenp, loff_t *ppos) 2726{ 2727 struct pid *new_pid; 2728 pid_t tmp; 2729 int r; 2730 2731 tmp = pid_vnr(cad_pid); 2732 2733 r = __do_proc_dointvec(&tmp, table, write, buffer, 2734 lenp, ppos, NULL, NULL); 2735 if (r || !write) 2736 return r; 2737 2738 new_pid = find_get_pid(tmp); 2739 if (!new_pid) 2740 return -ESRCH; 2741 2742 put_pid(xchg(&cad_pid, new_pid)); 2743 return 0; 2744} 2745 2746/** 2747 * proc_do_large_bitmap - read/write from/to a large bitmap 2748 * @table: the sysctl table 2749 * @write: %TRUE if this is a write to the sysctl file 2750 * @buffer: the user buffer 2751 * @lenp: the size of the user buffer 2752 * @ppos: file position 2753 * 2754 * The bitmap is stored at table->data and the bitmap length (in bits) 2755 * in table->maxlen. 2756 * 2757 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2758 * large bitmaps may be represented in a compact manner. Writing into 2759 * the file will clear the bitmap then update it with the given input. 2760 * 2761 * Returns 0 on success. 2762 */ 2763int proc_do_large_bitmap(struct ctl_table *table, int write, 2764 void __user *buffer, size_t *lenp, loff_t *ppos) 2765{ 2766 int err = 0; 2767 bool first = 1; 2768 size_t left = *lenp; 2769 unsigned long bitmap_len = table->maxlen; 2770 unsigned long *bitmap = (unsigned long *) table->data; 2771 unsigned long *tmp_bitmap = NULL; 2772 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2773 2774 if (!bitmap_len || !left || (*ppos && !write)) { 2775 *lenp = 0; 2776 return 0; 2777 } 2778 2779 if (write) { 2780 unsigned long page = 0; 2781 char *kbuf; 2782 2783 if (left > PAGE_SIZE - 1) 2784 left = PAGE_SIZE - 1; 2785 2786 page = __get_free_page(GFP_TEMPORARY); 2787 kbuf = (char *) page; 2788 if (!kbuf) 2789 return -ENOMEM; 2790 if (copy_from_user(kbuf, buffer, left)) { 2791 free_page(page); 2792 return -EFAULT; 2793 } 2794 kbuf[left] = 0; 2795 2796 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2797 GFP_KERNEL); 2798 if (!tmp_bitmap) { 2799 free_page(page); 2800 return -ENOMEM; 2801 } 2802 proc_skip_char(&kbuf, &left, '\n'); 2803 while (!err && left) { 2804 unsigned long val_a, val_b; 2805 bool neg; 2806 2807 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2808 sizeof(tr_a), &c); 2809 if (err) 2810 break; 2811 if (val_a >= bitmap_len || neg) { 2812 err = -EINVAL; 2813 break; 2814 } 2815 2816 val_b = val_a; 2817 if (left) { 2818 kbuf++; 2819 left--; 2820 } 2821 2822 if (c == '-') { 2823 err = proc_get_long(&kbuf, &left, &val_b, 2824 &neg, tr_b, sizeof(tr_b), 2825 &c); 2826 if (err) 2827 break; 2828 if (val_b >= bitmap_len || neg || 2829 val_a > val_b) { 2830 err = -EINVAL; 2831 break; 2832 } 2833 if (left) { 2834 kbuf++; 2835 left--; 2836 } 2837 } 2838 2839 while (val_a <= val_b) 2840 set_bit(val_a++, tmp_bitmap); 2841 2842 first = 0; 2843 proc_skip_char(&kbuf, &left, '\n'); 2844 } 2845 free_page(page); 2846 } else { 2847 unsigned long bit_a, bit_b = 0; 2848 2849 while (left) { 2850 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2851 if (bit_a >= bitmap_len) 2852 break; 2853 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2854 bit_a + 1) - 1; 2855 2856 if (!first) { 2857 err = proc_put_char(&buffer, &left, ','); 2858 if (err) 2859 break; 2860 } 2861 err = proc_put_long(&buffer, &left, bit_a, false); 2862 if (err) 2863 break; 2864 if (bit_a != bit_b) { 2865 err = proc_put_char(&buffer, &left, '-'); 2866 if (err) 2867 break; 2868 err = proc_put_long(&buffer, &left, bit_b, false); 2869 if (err) 2870 break; 2871 } 2872 2873 first = 0; bit_b++; 2874 } 2875 if (!err) 2876 err = proc_put_char(&buffer, &left, '\n'); 2877 } 2878 2879 if (!err) { 2880 if (write) { 2881 if (*ppos) 2882 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2883 else 2884 memcpy(bitmap, tmp_bitmap, 2885 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2886 } 2887 kfree(tmp_bitmap); 2888 *lenp -= left; 2889 *ppos += *lenp; 2890 return 0; 2891 } else { 2892 kfree(tmp_bitmap); 2893 return err; 2894 } 2895} 2896 2897#else /* CONFIG_PROC_FS */ 2898 2899int proc_dostring(struct ctl_table *table, int write, 2900 void __user *buffer, size_t *lenp, loff_t *ppos) 2901{ 2902 return -ENOSYS; 2903} 2904 2905int proc_dointvec(struct ctl_table *table, int write, 2906 void __user *buffer, size_t *lenp, loff_t *ppos) 2907{ 2908 return -ENOSYS; 2909} 2910 2911int proc_dointvec_minmax(struct ctl_table *table, int write, 2912 void __user *buffer, size_t *lenp, loff_t *ppos) 2913{ 2914 return -ENOSYS; 2915} 2916 2917int proc_dointvec_jiffies(struct ctl_table *table, int write, 2918 void __user *buffer, size_t *lenp, loff_t *ppos) 2919{ 2920 return -ENOSYS; 2921} 2922 2923int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2924 void __user *buffer, size_t *lenp, loff_t *ppos) 2925{ 2926 return -ENOSYS; 2927} 2928 2929int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2930 void __user *buffer, size_t *lenp, loff_t *ppos) 2931{ 2932 return -ENOSYS; 2933} 2934 2935int proc_doulongvec_minmax(struct ctl_table *table, int write, 2936 void __user *buffer, size_t *lenp, loff_t *ppos) 2937{ 2938 return -ENOSYS; 2939} 2940 2941int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2942 void __user *buffer, 2943 size_t *lenp, loff_t *ppos) 2944{ 2945 return -ENOSYS; 2946} 2947 2948 2949#endif /* CONFIG_PROC_FS */ 2950 2951/* 2952 * No sense putting this after each symbol definition, twice, 2953 * exception granted :-) 2954 */ 2955EXPORT_SYMBOL(proc_dointvec); 2956EXPORT_SYMBOL(proc_dointvec_jiffies); 2957EXPORT_SYMBOL(proc_dointvec_minmax); 2958EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2959EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2960EXPORT_SYMBOL(proc_dostring); 2961EXPORT_SYMBOL(proc_doulongvec_minmax); 2962EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2963EXPORT_SYMBOL(register_sysctl_table); 2964EXPORT_SYMBOL(register_sysctl_paths); 2965EXPORT_SYMBOL(unregister_sysctl_table); 2966