2 * sysctl.c: General linux system control interface
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
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
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
21 #include <linux/module.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>
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>
59 #include <asm/uaccess.h>
60 #include <asm/processor.h>
64 #include <asm/stacktrace.h>
67 #ifdef CONFIG_BSD_PROCESS_ACCT
68 #include <linux/acct.h>
70 #ifdef CONFIG_RT_MUTEXES
71 #include <linux/rtmutex.h>
73 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
74 #include <linux/lockdep.h>
76 #ifdef CONFIG_CHR_DEV_SG
80 #ifdef CONFIG_LOCKUP_DETECTOR
81 #include <linux/nmi.h>
85 #if defined(CONFIG_SYSCTL)
87 /* External variables not in a header file. */
88 extern int sysctl_overcommit_memory;
89 extern int sysctl_overcommit_ratio;
90 extern int max_threads;
91 extern int core_uses_pid;
92 extern int suid_dumpable;
93 extern char core_pattern[];
94 extern unsigned int core_pipe_limit;
96 extern int min_free_kbytes;
97 extern int pid_max_min, pid_max_max;
98 extern int sysctl_drop_caches;
99 extern int percpu_pagelist_fraction;
100 extern int compat_log;
101 extern int latencytop_enabled;
102 extern int sysctl_nr_open_min, sysctl_nr_open_max;
104 extern int sysctl_nr_trim_pages;
107 extern int blk_iopoll_enabled;
110 /* Constants used for minimum and maximum */
111 #ifdef CONFIG_LOCKUP_DETECTOR
112 static int sixty = 60;
113 static int neg_one = -1;
117 static int __maybe_unused one = 1;
118 static int __maybe_unused two = 2;
119 static unsigned long one_ul = 1;
120 static int one_hundred = 100;
122 static int ten_thousand = 10000;
125 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
126 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
128 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
129 static int maxolduid = 65535;
130 static int minolduid;
131 static int min_percpu_pagelist_fract = 8;
133 static int ngroups_max = NGROUPS_MAX;
135 #ifdef CONFIG_INOTIFY_USER
136 #include <linux/inotify.h>
139 #include <asm/system.h>
142 #ifdef CONFIG_SPARC64
143 extern int sysctl_tsb_ratio;
147 extern int pwrsw_enabled;
148 extern int unaligned_enabled;
152 #ifdef CONFIG_MATHEMU
153 extern int sysctl_ieee_emulation_warnings;
155 extern int sysctl_userprocess_debug;
156 extern int spin_retry;
160 extern int no_unaligned_warning;
161 extern int unaligned_dump_stack;
164 #ifdef CONFIG_PROC_SYSCTL
165 static int proc_do_cad_pid(struct ctl_table *table, int write,
166 void __user *buffer, size_t *lenp, loff_t *ppos);
167 static int proc_taint(struct ctl_table *table, int write,
168 void __user *buffer, size_t *lenp, loff_t *ppos);
172 static int proc_dmesg_restrict(struct ctl_table *table, int write,
173 void __user *buffer, size_t *lenp, loff_t *ppos);
176 #ifdef CONFIG_MAGIC_SYSRQ
177 /* Note: sysrq code uses it's own private copy */
178 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
180 static int sysrq_sysctl_handler(ctl_table *table, int write,
181 void __user *buffer, size_t *lenp,
186 error = proc_dointvec(table, write, buffer, lenp, ppos);
191 sysrq_toggle_support(__sysrq_enabled);
198 static struct ctl_table root_table[];
199 static struct ctl_table_root sysctl_table_root;
200 static struct ctl_table_header root_table_header = {
202 .ctl_table = root_table,
203 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
204 .root = &sysctl_table_root,
205 .set = &sysctl_table_root.default_set,
207 static struct ctl_table_root sysctl_table_root = {
208 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
209 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
212 static struct ctl_table kern_table[];
213 static struct ctl_table vm_table[];
214 static struct ctl_table fs_table[];
215 static struct ctl_table debug_table[];
216 static struct ctl_table dev_table[];
217 extern struct ctl_table random_table[];
219 extern struct ctl_table epoll_table[];
222 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
223 int sysctl_legacy_va_layout;
226 /* The default sysctl tables: */
228 static struct ctl_table root_table[] = {
230 .procname = "kernel",
247 .child = debug_table,
255 * NOTE: do not add new entries to this table unless you have read
256 * Documentation/sysctl/ctl_unnumbered.txt
261 #ifdef CONFIG_SCHED_DEBUG
262 static int min_sched_granularity_ns = 100000; /* 100 usecs */
263 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
264 static int min_wakeup_granularity_ns; /* 0 usecs */
265 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
266 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
267 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
268 static int min_sched_shares_ratelimit = 100000; /* 100 usec */
269 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
272 #ifdef CONFIG_COMPACTION
273 static int min_extfrag_threshold;
274 static int max_extfrag_threshold = 1000;
277 static struct ctl_table kern_table[] = {
279 .procname = "sched_child_runs_first",
280 .data = &sysctl_sched_child_runs_first,
281 .maxlen = sizeof(unsigned int),
283 .proc_handler = proc_dointvec,
285 #ifdef CONFIG_SCHED_DEBUG
287 .procname = "sched_min_granularity_ns",
288 .data = &sysctl_sched_min_granularity,
289 .maxlen = sizeof(unsigned int),
291 .proc_handler = sched_proc_update_handler,
292 .extra1 = &min_sched_granularity_ns,
293 .extra2 = &max_sched_granularity_ns,
296 .procname = "sched_latency_ns",
297 .data = &sysctl_sched_latency,
298 .maxlen = sizeof(unsigned int),
300 .proc_handler = sched_proc_update_handler,
301 .extra1 = &min_sched_granularity_ns,
302 .extra2 = &max_sched_granularity_ns,
305 .procname = "sched_wakeup_granularity_ns",
306 .data = &sysctl_sched_wakeup_granularity,
307 .maxlen = sizeof(unsigned int),
309 .proc_handler = sched_proc_update_handler,
310 .extra1 = &min_wakeup_granularity_ns,
311 .extra2 = &max_wakeup_granularity_ns,
314 .procname = "sched_shares_ratelimit",
315 .data = &sysctl_sched_shares_ratelimit,
316 .maxlen = sizeof(unsigned int),
318 .proc_handler = sched_proc_update_handler,
319 .extra1 = &min_sched_shares_ratelimit,
320 .extra2 = &max_sched_shares_ratelimit,
323 .procname = "sched_tunable_scaling",
324 .data = &sysctl_sched_tunable_scaling,
325 .maxlen = sizeof(enum sched_tunable_scaling),
327 .proc_handler = sched_proc_update_handler,
328 .extra1 = &min_sched_tunable_scaling,
329 .extra2 = &max_sched_tunable_scaling,
332 .procname = "sched_shares_thresh",
333 .data = &sysctl_sched_shares_thresh,
334 .maxlen = sizeof(unsigned int),
336 .proc_handler = proc_dointvec_minmax,
340 .procname = "sched_migration_cost",
341 .data = &sysctl_sched_migration_cost,
342 .maxlen = sizeof(unsigned int),
344 .proc_handler = proc_dointvec,
347 .procname = "sched_nr_migrate",
348 .data = &sysctl_sched_nr_migrate,
349 .maxlen = sizeof(unsigned int),
351 .proc_handler = proc_dointvec,
354 .procname = "sched_time_avg",
355 .data = &sysctl_sched_time_avg,
356 .maxlen = sizeof(unsigned int),
358 .proc_handler = proc_dointvec,
361 .procname = "timer_migration",
362 .data = &sysctl_timer_migration,
363 .maxlen = sizeof(unsigned int),
365 .proc_handler = proc_dointvec_minmax,
371 .procname = "sched_rt_period_us",
372 .data = &sysctl_sched_rt_period,
373 .maxlen = sizeof(unsigned int),
375 .proc_handler = sched_rt_handler,
378 .procname = "sched_rt_runtime_us",
379 .data = &sysctl_sched_rt_runtime,
380 .maxlen = sizeof(int),
382 .proc_handler = sched_rt_handler,
385 .procname = "sched_compat_yield",
386 .data = &sysctl_sched_compat_yield,
387 .maxlen = sizeof(unsigned int),
389 .proc_handler = proc_dointvec,
391 #ifdef CONFIG_PROVE_LOCKING
393 .procname = "prove_locking",
394 .data = &prove_locking,
395 .maxlen = sizeof(int),
397 .proc_handler = proc_dointvec,
400 #ifdef CONFIG_LOCK_STAT
402 .procname = "lock_stat",
404 .maxlen = sizeof(int),
406 .proc_handler = proc_dointvec,
411 .data = &panic_timeout,
412 .maxlen = sizeof(int),
414 .proc_handler = proc_dointvec,
417 .procname = "core_uses_pid",
418 .data = &core_uses_pid,
419 .maxlen = sizeof(int),
421 .proc_handler = proc_dointvec,
424 .procname = "core_pattern",
425 .data = core_pattern,
426 .maxlen = CORENAME_MAX_SIZE,
428 .proc_handler = proc_dostring,
431 .procname = "core_pipe_limit",
432 .data = &core_pipe_limit,
433 .maxlen = sizeof(unsigned int),
435 .proc_handler = proc_dointvec,
437 #ifdef CONFIG_PROC_SYSCTL
439 .procname = "tainted",
440 .maxlen = sizeof(long),
442 .proc_handler = proc_taint,
445 #ifdef CONFIG_LATENCYTOP
447 .procname = "latencytop",
448 .data = &latencytop_enabled,
449 .maxlen = sizeof(int),
451 .proc_handler = proc_dointvec,
454 #ifdef CONFIG_BLK_DEV_INITRD
456 .procname = "real-root-dev",
457 .data = &real_root_dev,
458 .maxlen = sizeof(int),
460 .proc_handler = proc_dointvec,
464 .procname = "print-fatal-signals",
465 .data = &print_fatal_signals,
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec,
472 .procname = "reboot-cmd",
473 .data = reboot_command,
476 .proc_handler = proc_dostring,
479 .procname = "stop-a",
480 .data = &stop_a_enabled,
481 .maxlen = sizeof (int),
483 .proc_handler = proc_dointvec,
486 .procname = "scons-poweroff",
487 .data = &scons_pwroff,
488 .maxlen = sizeof (int),
490 .proc_handler = proc_dointvec,
493 #ifdef CONFIG_SPARC64
495 .procname = "tsb-ratio",
496 .data = &sysctl_tsb_ratio,
497 .maxlen = sizeof (int),
499 .proc_handler = proc_dointvec,
504 .procname = "soft-power",
505 .data = &pwrsw_enabled,
506 .maxlen = sizeof (int),
508 .proc_handler = proc_dointvec,
511 .procname = "unaligned-trap",
512 .data = &unaligned_enabled,
513 .maxlen = sizeof (int),
515 .proc_handler = proc_dointvec,
519 .procname = "ctrl-alt-del",
521 .maxlen = sizeof(int),
523 .proc_handler = proc_dointvec,
525 #ifdef CONFIG_FUNCTION_TRACER
527 .procname = "ftrace_enabled",
528 .data = &ftrace_enabled,
529 .maxlen = sizeof(int),
531 .proc_handler = ftrace_enable_sysctl,
534 #ifdef CONFIG_STACK_TRACER
536 .procname = "stack_tracer_enabled",
537 .data = &stack_tracer_enabled,
538 .maxlen = sizeof(int),
540 .proc_handler = stack_trace_sysctl,
543 #ifdef CONFIG_TRACING
545 .procname = "ftrace_dump_on_oops",
546 .data = &ftrace_dump_on_oops,
547 .maxlen = sizeof(int),
549 .proc_handler = proc_dointvec,
552 #ifdef CONFIG_MODULES
554 .procname = "modprobe",
555 .data = &modprobe_path,
556 .maxlen = KMOD_PATH_LEN,
558 .proc_handler = proc_dostring,
561 .procname = "modules_disabled",
562 .data = &modules_disabled,
563 .maxlen = sizeof(int),
565 /* only handle a transition from default "0" to "1" */
566 .proc_handler = proc_dointvec_minmax,
571 #ifdef CONFIG_HOTPLUG
573 .procname = "hotplug",
574 .data = &uevent_helper,
575 .maxlen = UEVENT_HELPER_PATH_LEN,
577 .proc_handler = proc_dostring,
580 #ifdef CONFIG_CHR_DEV_SG
582 .procname = "sg-big-buff",
583 .data = &sg_big_buff,
584 .maxlen = sizeof (int),
586 .proc_handler = proc_dointvec,
589 #ifdef CONFIG_BSD_PROCESS_ACCT
593 .maxlen = 3*sizeof(int),
595 .proc_handler = proc_dointvec,
598 #ifdef CONFIG_MAGIC_SYSRQ
601 .data = &__sysrq_enabled,
602 .maxlen = sizeof (int),
604 .proc_handler = sysrq_sysctl_handler,
607 #ifdef CONFIG_PROC_SYSCTL
609 .procname = "cad_pid",
611 .maxlen = sizeof (int),
613 .proc_handler = proc_do_cad_pid,
617 .procname = "threads-max",
618 .data = &max_threads,
619 .maxlen = sizeof(int),
621 .proc_handler = proc_dointvec,
624 .procname = "random",
626 .child = random_table,
629 .procname = "overflowuid",
630 .data = &overflowuid,
631 .maxlen = sizeof(int),
633 .proc_handler = proc_dointvec_minmax,
634 .extra1 = &minolduid,
635 .extra2 = &maxolduid,
638 .procname = "overflowgid",
639 .data = &overflowgid,
640 .maxlen = sizeof(int),
642 .proc_handler = proc_dointvec_minmax,
643 .extra1 = &minolduid,
644 .extra2 = &maxolduid,
647 #ifdef CONFIG_MATHEMU
649 .procname = "ieee_emulation_warnings",
650 .data = &sysctl_ieee_emulation_warnings,
651 .maxlen = sizeof(int),
653 .proc_handler = proc_dointvec,
657 .procname = "userprocess_debug",
658 .data = &show_unhandled_signals,
659 .maxlen = sizeof(int),
661 .proc_handler = proc_dointvec,
665 .procname = "pid_max",
667 .maxlen = sizeof (int),
669 .proc_handler = proc_dointvec_minmax,
670 .extra1 = &pid_max_min,
671 .extra2 = &pid_max_max,
674 .procname = "panic_on_oops",
675 .data = &panic_on_oops,
676 .maxlen = sizeof(int),
678 .proc_handler = proc_dointvec,
680 #if defined CONFIG_PRINTK
682 .procname = "printk",
683 .data = &console_loglevel,
684 .maxlen = 4*sizeof(int),
686 .proc_handler = proc_dointvec,
689 .procname = "printk_ratelimit",
690 .data = &printk_ratelimit_state.interval,
691 .maxlen = sizeof(int),
693 .proc_handler = proc_dointvec_jiffies,
696 .procname = "printk_ratelimit_burst",
697 .data = &printk_ratelimit_state.burst,
698 .maxlen = sizeof(int),
700 .proc_handler = proc_dointvec,
703 .procname = "printk_delay",
704 .data = &printk_delay_msec,
705 .maxlen = sizeof(int),
707 .proc_handler = proc_dointvec_minmax,
709 .extra2 = &ten_thousand,
712 .procname = "dmesg_restrict",
713 .data = &dmesg_restrict,
714 .maxlen = sizeof(int),
716 .proc_handler = proc_dointvec_minmax,
722 .procname = "ngroups_max",
723 .data = &ngroups_max,
724 .maxlen = sizeof (int),
726 .proc_handler = proc_dointvec,
728 #if defined(CONFIG_LOCKUP_DETECTOR)
730 .procname = "watchdog",
731 .data = &watchdog_enabled,
732 .maxlen = sizeof (int),
734 .proc_handler = proc_dowatchdog_enabled,
737 .procname = "watchdog_thresh",
738 .data = &softlockup_thresh,
739 .maxlen = sizeof(int),
741 .proc_handler = proc_dowatchdog_thresh,
746 .procname = "softlockup_panic",
747 .data = &softlockup_panic,
748 .maxlen = sizeof(int),
750 .proc_handler = proc_dointvec_minmax,
755 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR)
757 .procname = "unknown_nmi_panic",
758 .data = &unknown_nmi_panic,
759 .maxlen = sizeof (int),
761 .proc_handler = proc_dointvec,
764 .procname = "nmi_watchdog",
765 .data = &nmi_watchdog_enabled,
766 .maxlen = sizeof (int),
768 .proc_handler = proc_nmi_enabled,
771 #if defined(CONFIG_X86)
773 .procname = "panic_on_unrecovered_nmi",
774 .data = &panic_on_unrecovered_nmi,
775 .maxlen = sizeof(int),
777 .proc_handler = proc_dointvec,
780 .procname = "panic_on_io_nmi",
781 .data = &panic_on_io_nmi,
782 .maxlen = sizeof(int),
784 .proc_handler = proc_dointvec,
787 .procname = "bootloader_type",
788 .data = &bootloader_type,
789 .maxlen = sizeof (int),
791 .proc_handler = proc_dointvec,
794 .procname = "bootloader_version",
795 .data = &bootloader_version,
796 .maxlen = sizeof (int),
798 .proc_handler = proc_dointvec,
801 .procname = "kstack_depth_to_print",
802 .data = &kstack_depth_to_print,
803 .maxlen = sizeof(int),
805 .proc_handler = proc_dointvec,
808 .procname = "io_delay_type",
809 .data = &io_delay_type,
810 .maxlen = sizeof(int),
812 .proc_handler = proc_dointvec,
815 #if defined(CONFIG_MMU)
817 .procname = "randomize_va_space",
818 .data = &randomize_va_space,
819 .maxlen = sizeof(int),
821 .proc_handler = proc_dointvec,
824 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
826 .procname = "spin_retry",
828 .maxlen = sizeof (int),
830 .proc_handler = proc_dointvec,
833 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
835 .procname = "acpi_video_flags",
836 .data = &acpi_realmode_flags,
837 .maxlen = sizeof (unsigned long),
839 .proc_handler = proc_doulongvec_minmax,
844 .procname = "ignore-unaligned-usertrap",
845 .data = &no_unaligned_warning,
846 .maxlen = sizeof (int),
848 .proc_handler = proc_dointvec,
851 .procname = "unaligned-dump-stack",
852 .data = &unaligned_dump_stack,
853 .maxlen = sizeof (int),
855 .proc_handler = proc_dointvec,
858 #ifdef CONFIG_DETECT_HUNG_TASK
860 .procname = "hung_task_panic",
861 .data = &sysctl_hung_task_panic,
862 .maxlen = sizeof(int),
864 .proc_handler = proc_dointvec_minmax,
869 .procname = "hung_task_check_count",
870 .data = &sysctl_hung_task_check_count,
871 .maxlen = sizeof(unsigned long),
873 .proc_handler = proc_doulongvec_minmax,
876 .procname = "hung_task_timeout_secs",
877 .data = &sysctl_hung_task_timeout_secs,
878 .maxlen = sizeof(unsigned long),
880 .proc_handler = proc_dohung_task_timeout_secs,
883 .procname = "hung_task_warnings",
884 .data = &sysctl_hung_task_warnings,
885 .maxlen = sizeof(unsigned long),
887 .proc_handler = proc_doulongvec_minmax,
892 .procname = "compat-log",
894 .maxlen = sizeof (int),
896 .proc_handler = proc_dointvec,
899 #ifdef CONFIG_RT_MUTEXES
901 .procname = "max_lock_depth",
902 .data = &max_lock_depth,
903 .maxlen = sizeof(int),
905 .proc_handler = proc_dointvec,
909 .procname = "poweroff_cmd",
910 .data = &poweroff_cmd,
911 .maxlen = POWEROFF_CMD_PATH_LEN,
913 .proc_handler = proc_dostring,
919 .child = key_sysctls,
922 #ifdef CONFIG_RCU_TORTURE_TEST
924 .procname = "rcutorture_runnable",
925 .data = &rcutorture_runnable,
926 .maxlen = sizeof(int),
928 .proc_handler = proc_dointvec,
931 #ifdef CONFIG_PERF_EVENTS
933 .procname = "perf_event_paranoid",
934 .data = &sysctl_perf_event_paranoid,
935 .maxlen = sizeof(sysctl_perf_event_paranoid),
937 .proc_handler = proc_dointvec,
940 .procname = "perf_event_mlock_kb",
941 .data = &sysctl_perf_event_mlock,
942 .maxlen = sizeof(sysctl_perf_event_mlock),
944 .proc_handler = proc_dointvec,
947 .procname = "perf_event_max_sample_rate",
948 .data = &sysctl_perf_event_sample_rate,
949 .maxlen = sizeof(sysctl_perf_event_sample_rate),
951 .proc_handler = proc_dointvec,
954 #ifdef CONFIG_KMEMCHECK
956 .procname = "kmemcheck",
957 .data = &kmemcheck_enabled,
958 .maxlen = sizeof(int),
960 .proc_handler = proc_dointvec,
965 .procname = "blk_iopoll",
966 .data = &blk_iopoll_enabled,
967 .maxlen = sizeof(int),
969 .proc_handler = proc_dointvec,
973 * NOTE: do not add new entries to this table unless you have read
974 * Documentation/sysctl/ctl_unnumbered.txt
979 static struct ctl_table vm_table[] = {
981 .procname = "overcommit_memory",
982 .data = &sysctl_overcommit_memory,
983 .maxlen = sizeof(sysctl_overcommit_memory),
985 .proc_handler = proc_dointvec,
988 .procname = "panic_on_oom",
989 .data = &sysctl_panic_on_oom,
990 .maxlen = sizeof(sysctl_panic_on_oom),
992 .proc_handler = proc_dointvec,
995 .procname = "oom_kill_allocating_task",
996 .data = &sysctl_oom_kill_allocating_task,
997 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
999 .proc_handler = proc_dointvec,
1002 .procname = "oom_dump_tasks",
1003 .data = &sysctl_oom_dump_tasks,
1004 .maxlen = sizeof(sysctl_oom_dump_tasks),
1006 .proc_handler = proc_dointvec,
1009 .procname = "overcommit_ratio",
1010 .data = &sysctl_overcommit_ratio,
1011 .maxlen = sizeof(sysctl_overcommit_ratio),
1013 .proc_handler = proc_dointvec,
1016 .procname = "page-cluster",
1017 .data = &page_cluster,
1018 .maxlen = sizeof(int),
1020 .proc_handler = proc_dointvec,
1023 .procname = "dirty_background_ratio",
1024 .data = &dirty_background_ratio,
1025 .maxlen = sizeof(dirty_background_ratio),
1027 .proc_handler = dirty_background_ratio_handler,
1029 .extra2 = &one_hundred,
1032 .procname = "dirty_background_bytes",
1033 .data = &dirty_background_bytes,
1034 .maxlen = sizeof(dirty_background_bytes),
1036 .proc_handler = dirty_background_bytes_handler,
1040 .procname = "dirty_ratio",
1041 .data = &vm_dirty_ratio,
1042 .maxlen = sizeof(vm_dirty_ratio),
1044 .proc_handler = dirty_ratio_handler,
1046 .extra2 = &one_hundred,
1049 .procname = "dirty_bytes",
1050 .data = &vm_dirty_bytes,
1051 .maxlen = sizeof(vm_dirty_bytes),
1053 .proc_handler = dirty_bytes_handler,
1054 .extra1 = &dirty_bytes_min,
1057 .procname = "dirty_writeback_centisecs",
1058 .data = &dirty_writeback_interval,
1059 .maxlen = sizeof(dirty_writeback_interval),
1061 .proc_handler = dirty_writeback_centisecs_handler,
1064 .procname = "dirty_expire_centisecs",
1065 .data = &dirty_expire_interval,
1066 .maxlen = sizeof(dirty_expire_interval),
1068 .proc_handler = proc_dointvec,
1071 .procname = "nr_pdflush_threads",
1072 .data = &nr_pdflush_threads,
1073 .maxlen = sizeof nr_pdflush_threads,
1074 .mode = 0444 /* read-only*/,
1075 .proc_handler = proc_dointvec,
1078 .procname = "swappiness",
1079 .data = &vm_swappiness,
1080 .maxlen = sizeof(vm_swappiness),
1082 .proc_handler = proc_dointvec_minmax,
1084 .extra2 = &one_hundred,
1086 #ifdef CONFIG_HUGETLB_PAGE
1088 .procname = "nr_hugepages",
1090 .maxlen = sizeof(unsigned long),
1092 .proc_handler = hugetlb_sysctl_handler,
1093 .extra1 = (void *)&hugetlb_zero,
1094 .extra2 = (void *)&hugetlb_infinity,
1098 .procname = "nr_hugepages_mempolicy",
1100 .maxlen = sizeof(unsigned long),
1102 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1103 .extra1 = (void *)&hugetlb_zero,
1104 .extra2 = (void *)&hugetlb_infinity,
1108 .procname = "hugetlb_shm_group",
1109 .data = &sysctl_hugetlb_shm_group,
1110 .maxlen = sizeof(gid_t),
1112 .proc_handler = proc_dointvec,
1115 .procname = "hugepages_treat_as_movable",
1116 .data = &hugepages_treat_as_movable,
1117 .maxlen = sizeof(int),
1119 .proc_handler = hugetlb_treat_movable_handler,
1122 .procname = "nr_overcommit_hugepages",
1124 .maxlen = sizeof(unsigned long),
1126 .proc_handler = hugetlb_overcommit_handler,
1127 .extra1 = (void *)&hugetlb_zero,
1128 .extra2 = (void *)&hugetlb_infinity,
1132 .procname = "lowmem_reserve_ratio",
1133 .data = &sysctl_lowmem_reserve_ratio,
1134 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1136 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1139 .procname = "drop_caches",
1140 .data = &sysctl_drop_caches,
1141 .maxlen = sizeof(int),
1143 .proc_handler = drop_caches_sysctl_handler,
1145 #ifdef CONFIG_COMPACTION
1147 .procname = "compact_memory",
1148 .data = &sysctl_compact_memory,
1149 .maxlen = sizeof(int),
1151 .proc_handler = sysctl_compaction_handler,
1154 .procname = "extfrag_threshold",
1155 .data = &sysctl_extfrag_threshold,
1156 .maxlen = sizeof(int),
1158 .proc_handler = sysctl_extfrag_handler,
1159 .extra1 = &min_extfrag_threshold,
1160 .extra2 = &max_extfrag_threshold,
1163 #endif /* CONFIG_COMPACTION */
1165 .procname = "min_free_kbytes",
1166 .data = &min_free_kbytes,
1167 .maxlen = sizeof(min_free_kbytes),
1169 .proc_handler = min_free_kbytes_sysctl_handler,
1173 .procname = "percpu_pagelist_fraction",
1174 .data = &percpu_pagelist_fraction,
1175 .maxlen = sizeof(percpu_pagelist_fraction),
1177 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1178 .extra1 = &min_percpu_pagelist_fract,
1182 .procname = "max_map_count",
1183 .data = &sysctl_max_map_count,
1184 .maxlen = sizeof(sysctl_max_map_count),
1186 .proc_handler = proc_dointvec_minmax,
1191 .procname = "nr_trim_pages",
1192 .data = &sysctl_nr_trim_pages,
1193 .maxlen = sizeof(sysctl_nr_trim_pages),
1195 .proc_handler = proc_dointvec_minmax,
1200 .procname = "laptop_mode",
1201 .data = &laptop_mode,
1202 .maxlen = sizeof(laptop_mode),
1204 .proc_handler = proc_dointvec_jiffies,
1207 .procname = "block_dump",
1208 .data = &block_dump,
1209 .maxlen = sizeof(block_dump),
1211 .proc_handler = proc_dointvec,
1215 .procname = "vfs_cache_pressure",
1216 .data = &sysctl_vfs_cache_pressure,
1217 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1219 .proc_handler = proc_dointvec,
1222 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1224 .procname = "legacy_va_layout",
1225 .data = &sysctl_legacy_va_layout,
1226 .maxlen = sizeof(sysctl_legacy_va_layout),
1228 .proc_handler = proc_dointvec,
1234 .procname = "zone_reclaim_mode",
1235 .data = &zone_reclaim_mode,
1236 .maxlen = sizeof(zone_reclaim_mode),
1238 .proc_handler = proc_dointvec,
1242 .procname = "min_unmapped_ratio",
1243 .data = &sysctl_min_unmapped_ratio,
1244 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1246 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1248 .extra2 = &one_hundred,
1251 .procname = "min_slab_ratio",
1252 .data = &sysctl_min_slab_ratio,
1253 .maxlen = sizeof(sysctl_min_slab_ratio),
1255 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1257 .extra2 = &one_hundred,
1262 .procname = "stat_interval",
1263 .data = &sysctl_stat_interval,
1264 .maxlen = sizeof(sysctl_stat_interval),
1266 .proc_handler = proc_dointvec_jiffies,
1271 .procname = "mmap_min_addr",
1272 .data = &dac_mmap_min_addr,
1273 .maxlen = sizeof(unsigned long),
1275 .proc_handler = mmap_min_addr_handler,
1280 .procname = "numa_zonelist_order",
1281 .data = &numa_zonelist_order,
1282 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1284 .proc_handler = numa_zonelist_order_handler,
1287 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1288 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1290 .procname = "vdso_enabled",
1291 .data = &vdso_enabled,
1292 .maxlen = sizeof(vdso_enabled),
1294 .proc_handler = proc_dointvec,
1298 #ifdef CONFIG_HIGHMEM
1300 .procname = "highmem_is_dirtyable",
1301 .data = &vm_highmem_is_dirtyable,
1302 .maxlen = sizeof(vm_highmem_is_dirtyable),
1304 .proc_handler = proc_dointvec_minmax,
1310 .procname = "scan_unevictable_pages",
1311 .data = &scan_unevictable_pages,
1312 .maxlen = sizeof(scan_unevictable_pages),
1314 .proc_handler = scan_unevictable_handler,
1316 #ifdef CONFIG_MEMORY_FAILURE
1318 .procname = "memory_failure_early_kill",
1319 .data = &sysctl_memory_failure_early_kill,
1320 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1322 .proc_handler = proc_dointvec_minmax,
1327 .procname = "memory_failure_recovery",
1328 .data = &sysctl_memory_failure_recovery,
1329 .maxlen = sizeof(sysctl_memory_failure_recovery),
1331 .proc_handler = proc_dointvec_minmax,
1338 * NOTE: do not add new entries to this table unless you have read
1339 * Documentation/sysctl/ctl_unnumbered.txt
1344 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1345 static struct ctl_table binfmt_misc_table[] = {
1350 static struct ctl_table fs_table[] = {
1352 .procname = "inode-nr",
1353 .data = &inodes_stat,
1354 .maxlen = 2*sizeof(int),
1356 .proc_handler = proc_nr_inodes,
1359 .procname = "inode-state",
1360 .data = &inodes_stat,
1361 .maxlen = 7*sizeof(int),
1363 .proc_handler = proc_nr_inodes,
1366 .procname = "file-nr",
1367 .data = &files_stat,
1368 .maxlen = sizeof(files_stat),
1370 .proc_handler = proc_nr_files,
1373 .procname = "file-max",
1374 .data = &files_stat.max_files,
1375 .maxlen = sizeof(files_stat.max_files),
1377 .proc_handler = proc_doulongvec_minmax,
1380 .procname = "nr_open",
1381 .data = &sysctl_nr_open,
1382 .maxlen = sizeof(int),
1384 .proc_handler = proc_dointvec_minmax,
1385 .extra1 = &sysctl_nr_open_min,
1386 .extra2 = &sysctl_nr_open_max,
1389 .procname = "dentry-state",
1390 .data = &dentry_stat,
1391 .maxlen = 6*sizeof(int),
1393 .proc_handler = proc_nr_dentry,
1396 .procname = "overflowuid",
1397 .data = &fs_overflowuid,
1398 .maxlen = sizeof(int),
1400 .proc_handler = proc_dointvec_minmax,
1401 .extra1 = &minolduid,
1402 .extra2 = &maxolduid,
1405 .procname = "overflowgid",
1406 .data = &fs_overflowgid,
1407 .maxlen = sizeof(int),
1409 .proc_handler = proc_dointvec_minmax,
1410 .extra1 = &minolduid,
1411 .extra2 = &maxolduid,
1413 #ifdef CONFIG_FILE_LOCKING
1415 .procname = "leases-enable",
1416 .data = &leases_enable,
1417 .maxlen = sizeof(int),
1419 .proc_handler = proc_dointvec,
1422 #ifdef CONFIG_DNOTIFY
1424 .procname = "dir-notify-enable",
1425 .data = &dir_notify_enable,
1426 .maxlen = sizeof(int),
1428 .proc_handler = proc_dointvec,
1432 #ifdef CONFIG_FILE_LOCKING
1434 .procname = "lease-break-time",
1435 .data = &lease_break_time,
1436 .maxlen = sizeof(int),
1438 .proc_handler = proc_dointvec,
1443 .procname = "aio-nr",
1445 .maxlen = sizeof(aio_nr),
1447 .proc_handler = proc_doulongvec_minmax,
1450 .procname = "aio-max-nr",
1451 .data = &aio_max_nr,
1452 .maxlen = sizeof(aio_max_nr),
1454 .proc_handler = proc_doulongvec_minmax,
1456 #endif /* CONFIG_AIO */
1457 #ifdef CONFIG_INOTIFY_USER
1459 .procname = "inotify",
1461 .child = inotify_table,
1466 .procname = "epoll",
1468 .child = epoll_table,
1473 .procname = "suid_dumpable",
1474 .data = &suid_dumpable,
1475 .maxlen = sizeof(int),
1477 .proc_handler = proc_dmesg_restrict,
1481 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1483 .procname = "binfmt_misc",
1485 .child = binfmt_misc_table,
1489 .procname = "pipe-max-size",
1490 .data = &pipe_max_size,
1491 .maxlen = sizeof(int),
1493 .proc_handler = &pipe_proc_fn,
1494 .extra1 = &pipe_min_size,
1497 * NOTE: do not add new entries to this table unless you have read
1498 * Documentation/sysctl/ctl_unnumbered.txt
1503 static struct ctl_table debug_table[] = {
1504 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1505 defined(CONFIG_S390)
1507 .procname = "exception-trace",
1508 .data = &show_unhandled_signals,
1509 .maxlen = sizeof(int),
1511 .proc_handler = proc_dointvec
1514 #if defined(CONFIG_OPTPROBES)
1516 .procname = "kprobes-optimization",
1517 .data = &sysctl_kprobes_optimization,
1518 .maxlen = sizeof(int),
1520 .proc_handler = proc_kprobes_optimization_handler,
1528 static struct ctl_table dev_table[] = {
1532 static DEFINE_SPINLOCK(sysctl_lock);
1534 /* called under sysctl_lock */
1535 static int use_table(struct ctl_table_header *p)
1537 if (unlikely(p->unregistering))
1543 /* called under sysctl_lock */
1544 static void unuse_table(struct ctl_table_header *p)
1547 if (unlikely(p->unregistering))
1548 complete(p->unregistering);
1551 /* called under sysctl_lock, will reacquire if has to wait */
1552 static void start_unregistering(struct ctl_table_header *p)
1555 * if p->used is 0, nobody will ever touch that entry again;
1556 * we'll eliminate all paths to it before dropping sysctl_lock
1558 if (unlikely(p->used)) {
1559 struct completion wait;
1560 init_completion(&wait);
1561 p->unregistering = &wait;
1562 spin_unlock(&sysctl_lock);
1563 wait_for_completion(&wait);
1564 spin_lock(&sysctl_lock);
1566 /* anything non-NULL; we'll never dereference it */
1567 p->unregistering = ERR_PTR(-EINVAL);
1570 * do not remove from the list until nobody holds it; walking the
1571 * list in do_sysctl() relies on that.
1573 list_del_init(&p->ctl_entry);
1576 void sysctl_head_get(struct ctl_table_header *head)
1578 spin_lock(&sysctl_lock);
1580 spin_unlock(&sysctl_lock);
1583 void sysctl_head_put(struct ctl_table_header *head)
1585 spin_lock(&sysctl_lock);
1588 spin_unlock(&sysctl_lock);
1591 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1595 spin_lock(&sysctl_lock);
1596 if (!use_table(head))
1597 head = ERR_PTR(-ENOENT);
1598 spin_unlock(&sysctl_lock);
1602 void sysctl_head_finish(struct ctl_table_header *head)
1606 spin_lock(&sysctl_lock);
1608 spin_unlock(&sysctl_lock);
1611 static struct ctl_table_set *
1612 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1614 struct ctl_table_set *set = &root->default_set;
1616 set = root->lookup(root, namespaces);
1620 static struct list_head *
1621 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1623 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1627 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1628 struct ctl_table_header *prev)
1630 struct ctl_table_root *root;
1631 struct list_head *header_list;
1632 struct ctl_table_header *head;
1633 struct list_head *tmp;
1635 spin_lock(&sysctl_lock);
1638 tmp = &prev->ctl_entry;
1642 tmp = &root_table_header.ctl_entry;
1644 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1646 if (!use_table(head))
1648 spin_unlock(&sysctl_lock);
1653 header_list = lookup_header_list(root, namespaces);
1654 if (tmp != header_list)
1658 root = list_entry(root->root_list.next,
1659 struct ctl_table_root, root_list);
1660 if (root == &sysctl_table_root)
1662 header_list = lookup_header_list(root, namespaces);
1663 } while (list_empty(header_list));
1664 tmp = header_list->next;
1667 spin_unlock(&sysctl_lock);
1671 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1673 return __sysctl_head_next(current->nsproxy, prev);
1676 void register_sysctl_root(struct ctl_table_root *root)
1678 spin_lock(&sysctl_lock);
1679 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1680 spin_unlock(&sysctl_lock);
1684 * sysctl_perm does NOT grant the superuser all rights automatically, because
1685 * some sysctl variables are readonly even to root.
1688 static int test_perm(int mode, int op)
1690 if (!current_euid())
1692 else if (in_egroup_p(0))
1694 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1699 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1704 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1708 if (root->permissions)
1709 mode = root->permissions(root, current->nsproxy, table);
1713 return test_perm(mode, op);
1716 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1718 for (; table->procname; table++) {
1719 table->parent = parent;
1721 sysctl_set_parent(table, table->child);
1725 static __init int sysctl_init(void)
1727 sysctl_set_parent(NULL, root_table);
1728 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1729 sysctl_check_table(current->nsproxy, root_table);
1734 core_initcall(sysctl_init);
1736 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1737 struct ctl_table *table)
1739 struct ctl_table *p;
1740 const char *s = branch->procname;
1742 /* branch should have named subdirectory as its first element */
1743 if (!s || !branch->child)
1746 /* ... and nothing else */
1747 if (branch[1].procname)
1750 /* table should contain subdirectory with the same name */
1751 for (p = table; p->procname; p++) {
1754 if (p->procname && strcmp(p->procname, s) == 0)
1760 /* see if attaching q to p would be an improvement */
1761 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1763 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1764 struct ctl_table *next;
1766 int not_in_parent = !p->attached_by;
1768 while ((next = is_branch_in(by, to)) != NULL) {
1769 if (by == q->attached_by)
1771 if (to == p->attached_by)
1777 if (is_better && not_in_parent) {
1778 q->attached_by = by;
1779 q->attached_to = to;
1785 * __register_sysctl_paths - register a sysctl hierarchy
1786 * @root: List of sysctl headers to register on
1787 * @namespaces: Data to compute which lists of sysctl entries are visible
1788 * @path: The path to the directory the sysctl table is in.
1789 * @table: the top-level table structure
1791 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1792 * array. A completely 0 filled entry terminates the table.
1794 * The members of the &struct ctl_table structure are used as follows:
1796 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1797 * enter a sysctl file
1799 * data - a pointer to data for use by proc_handler
1801 * maxlen - the maximum size in bytes of the data
1803 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1805 * child - a pointer to the child sysctl table if this entry is a directory, or
1808 * proc_handler - the text handler routine (described below)
1810 * de - for internal use by the sysctl routines
1812 * extra1, extra2 - extra pointers usable by the proc handler routines
1814 * Leaf nodes in the sysctl tree will be represented by a single file
1815 * under /proc; non-leaf nodes will be represented by directories.
1817 * sysctl(2) can automatically manage read and write requests through
1818 * the sysctl table. The data and maxlen fields of the ctl_table
1819 * struct enable minimal validation of the values being written to be
1820 * performed, and the mode field allows minimal authentication.
1822 * There must be a proc_handler routine for any terminal nodes
1823 * mirrored under /proc/sys (non-terminals are handled by a built-in
1824 * directory handler). Several default handlers are available to
1825 * cover common cases -
1827 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1828 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1829 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1831 * It is the handler's job to read the input buffer from user memory
1832 * and process it. The handler should return 0 on success.
1834 * This routine returns %NULL on a failure to register, and a pointer
1835 * to the table header on success.
1837 struct ctl_table_header *__register_sysctl_paths(
1838 struct ctl_table_root *root,
1839 struct nsproxy *namespaces,
1840 const struct ctl_path *path, struct ctl_table *table)
1842 struct ctl_table_header *header;
1843 struct ctl_table *new, **prevp;
1844 unsigned int n, npath;
1845 struct ctl_table_set *set;
1847 /* Count the path components */
1848 for (npath = 0; path[npath].procname; ++npath)
1852 * For each path component, allocate a 2-element ctl_table array.
1853 * The first array element will be filled with the sysctl entry
1854 * for this, the second will be the sentinel (procname == 0).
1856 * We allocate everything in one go so that we don't have to
1857 * worry about freeing additional memory in unregister_sysctl_table.
1859 header = kzalloc(sizeof(struct ctl_table_header) +
1860 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1864 new = (struct ctl_table *) (header + 1);
1866 /* Now connect the dots */
1867 prevp = &header->ctl_table;
1868 for (n = 0; n < npath; ++n, ++path) {
1869 /* Copy the procname */
1870 new->procname = path->procname;
1874 prevp = &new->child;
1879 header->ctl_table_arg = table;
1881 INIT_LIST_HEAD(&header->ctl_entry);
1883 header->unregistering = NULL;
1884 header->root = root;
1885 sysctl_set_parent(NULL, header->ctl_table);
1887 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1888 if (sysctl_check_table(namespaces, header->ctl_table)) {
1893 spin_lock(&sysctl_lock);
1894 header->set = lookup_header_set(root, namespaces);
1895 header->attached_by = header->ctl_table;
1896 header->attached_to = root_table;
1897 header->parent = &root_table_header;
1898 for (set = header->set; set; set = set->parent) {
1899 struct ctl_table_header *p;
1900 list_for_each_entry(p, &set->list, ctl_entry) {
1901 if (p->unregistering)
1903 try_attach(p, header);
1906 header->parent->count++;
1907 list_add_tail(&header->ctl_entry, &header->set->list);
1908 spin_unlock(&sysctl_lock);
1914 * register_sysctl_table_path - register a sysctl table hierarchy
1915 * @path: The path to the directory the sysctl table is in.
1916 * @table: the top-level table structure
1918 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1919 * array. A completely 0 filled entry terminates the table.
1921 * See __register_sysctl_paths for more details.
1923 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1924 struct ctl_table *table)
1926 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1931 * register_sysctl_table - register a sysctl table hierarchy
1932 * @table: the top-level table structure
1934 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1935 * array. A completely 0 filled entry terminates the table.
1937 * See register_sysctl_paths for more details.
1939 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1941 static const struct ctl_path null_path[] = { {} };
1943 return register_sysctl_paths(null_path, table);
1947 * unregister_sysctl_table - unregister a sysctl table hierarchy
1948 * @header: the header returned from register_sysctl_table
1950 * Unregisters the sysctl table and all children. proc entries may not
1951 * actually be removed until they are no longer used by anyone.
1953 void unregister_sysctl_table(struct ctl_table_header * header)
1960 spin_lock(&sysctl_lock);
1961 start_unregistering(header);
1962 if (!--header->parent->count) {
1964 kfree(header->parent);
1966 if (!--header->count)
1968 spin_unlock(&sysctl_lock);
1971 int sysctl_is_seen(struct ctl_table_header *p)
1973 struct ctl_table_set *set = p->set;
1975 spin_lock(&sysctl_lock);
1976 if (p->unregistering)
1978 else if (!set->is_seen)
1981 res = set->is_seen(set);
1982 spin_unlock(&sysctl_lock);
1986 void setup_sysctl_set(struct ctl_table_set *p,
1987 struct ctl_table_set *parent,
1988 int (*is_seen)(struct ctl_table_set *))
1990 INIT_LIST_HEAD(&p->list);
1991 p->parent = parent ? parent : &sysctl_table_root.default_set;
1992 p->is_seen = is_seen;
1995 #else /* !CONFIG_SYSCTL */
1996 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2001 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2002 struct ctl_table *table)
2007 void unregister_sysctl_table(struct ctl_table_header * table)
2011 void setup_sysctl_set(struct ctl_table_set *p,
2012 struct ctl_table_set *parent,
2013 int (*is_seen)(struct ctl_table_set *))
2017 void sysctl_head_put(struct ctl_table_header *head)
2021 #endif /* CONFIG_SYSCTL */
2027 #ifdef CONFIG_PROC_SYSCTL
2029 static int _proc_do_string(void* data, int maxlen, int write,
2030 void __user *buffer,
2031 size_t *lenp, loff_t *ppos)
2037 if (!data || !maxlen || !*lenp) {
2045 while (len < *lenp) {
2046 if (get_user(c, p++))
2048 if (c == 0 || c == '\n')
2054 if(copy_from_user(data, buffer, len))
2056 ((char *) data)[len] = 0;
2074 if(copy_to_user(buffer, data, len))
2077 if(put_user('\n', ((char __user *) buffer) + len))
2088 * proc_dostring - read a string sysctl
2089 * @table: the sysctl table
2090 * @write: %TRUE if this is a write to the sysctl file
2091 * @buffer: the user buffer
2092 * @lenp: the size of the user buffer
2093 * @ppos: file position
2095 * Reads/writes a string from/to the user buffer. If the kernel
2096 * buffer provided is not large enough to hold the string, the
2097 * string is truncated. The copied string is %NULL-terminated.
2098 * If the string is being read by the user process, it is copied
2099 * and a newline '\n' is added. It is truncated if the buffer is
2102 * Returns 0 on success.
2104 int proc_dostring(struct ctl_table *table, int write,
2105 void __user *buffer, size_t *lenp, loff_t *ppos)
2107 return _proc_do_string(table->data, table->maxlen, write,
2108 buffer, lenp, ppos);
2111 static size_t proc_skip_spaces(char **buf)
2114 char *tmp = skip_spaces(*buf);
2120 static void proc_skip_char(char **buf, size_t *size, const char v)
2130 #define TMPBUFLEN 22
2132 * proc_get_long - reads an ASCII formatted integer from a user buffer
2134 * @buf: a kernel buffer
2135 * @size: size of the kernel buffer
2136 * @val: this is where the number will be stored
2137 * @neg: set to %TRUE if number is negative
2138 * @perm_tr: a vector which contains the allowed trailers
2139 * @perm_tr_len: size of the perm_tr vector
2140 * @tr: pointer to store the trailer character
2142 * In case of success %0 is returned and @buf and @size are updated with
2143 * the amount of bytes read. If @tr is non-NULL and a trailing
2144 * character exists (size is non-zero after returning from this
2145 * function), @tr is updated with the trailing character.
2147 static int proc_get_long(char **buf, size_t *size,
2148 unsigned long *val, bool *neg,
2149 const char *perm_tr, unsigned perm_tr_len, char *tr)
2152 char *p, tmp[TMPBUFLEN];
2158 if (len > TMPBUFLEN - 1)
2159 len = TMPBUFLEN - 1;
2161 memcpy(tmp, *buf, len);
2165 if (*p == '-' && *size > 1) {
2173 *val = simple_strtoul(p, &p, 0);
2177 /* We don't know if the next char is whitespace thus we may accept
2178 * invalid integers (e.g. 1234...a) or two integers instead of one
2179 * (e.g. 123...1). So lets not allow such large numbers. */
2180 if (len == TMPBUFLEN - 1)
2183 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2186 if (tr && (len < *size))
2196 * proc_put_long - converts an integer to a decimal ASCII formatted string
2198 * @buf: the user buffer
2199 * @size: the size of the user buffer
2200 * @val: the integer to be converted
2201 * @neg: sign of the number, %TRUE for negative
2203 * In case of success %0 is returned and @buf and @size are updated with
2204 * the amount of bytes written.
2206 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2210 char tmp[TMPBUFLEN], *p = tmp;
2212 sprintf(p, "%s%lu", neg ? "-" : "", val);
2216 if (copy_to_user(*buf, tmp, len))
2224 static int proc_put_char(void __user **buf, size_t *size, char c)
2227 char __user **buffer = (char __user **)buf;
2228 if (put_user(c, *buffer))
2230 (*size)--, (*buffer)++;
2236 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2238 int write, void *data)
2241 *valp = *negp ? -*lvalp : *lvalp;
2246 *lvalp = (unsigned long)-val;
2249 *lvalp = (unsigned long)val;
2255 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2257 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2258 int write, void __user *buffer,
2259 size_t *lenp, loff_t *ppos,
2260 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2261 int write, void *data),
2264 int *i, vleft, first = 1, err = 0;
2265 unsigned long page = 0;
2269 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2274 i = (int *) tbl_data;
2275 vleft = table->maxlen / sizeof(*i);
2279 conv = do_proc_dointvec_conv;
2282 if (left > PAGE_SIZE - 1)
2283 left = PAGE_SIZE - 1;
2284 page = __get_free_page(GFP_TEMPORARY);
2285 kbuf = (char *) page;
2288 if (copy_from_user(kbuf, buffer, left)) {
2295 for (; left && vleft--; i++, first=0) {
2300 left -= proc_skip_spaces(&kbuf);
2304 err = proc_get_long(&kbuf, &left, &lval, &neg,
2306 sizeof(proc_wspace_sep), NULL);
2309 if (conv(&neg, &lval, i, 1, data)) {
2314 if (conv(&neg, &lval, i, 0, data)) {
2319 err = proc_put_char(&buffer, &left, '\t');
2322 err = proc_put_long(&buffer, &left, lval, neg);
2328 if (!write && !first && left && !err)
2329 err = proc_put_char(&buffer, &left, '\n');
2330 if (write && !err && left)
2331 left -= proc_skip_spaces(&kbuf);
2336 return err ? : -EINVAL;
2343 static int do_proc_dointvec(struct ctl_table *table, int write,
2344 void __user *buffer, size_t *lenp, loff_t *ppos,
2345 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2346 int write, void *data),
2349 return __do_proc_dointvec(table->data, table, write,
2350 buffer, lenp, ppos, conv, data);
2354 * proc_dointvec - read a vector of integers
2355 * @table: the sysctl table
2356 * @write: %TRUE if this is a write to the sysctl file
2357 * @buffer: the user buffer
2358 * @lenp: the size of the user buffer
2359 * @ppos: file position
2361 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2362 * values from/to the user buffer, treated as an ASCII string.
2364 * Returns 0 on success.
2366 int proc_dointvec(struct ctl_table *table, int write,
2367 void __user *buffer, size_t *lenp, loff_t *ppos)
2369 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2374 * Taint values can only be increased
2375 * This means we can safely use a temporary.
2377 static int proc_taint(struct ctl_table *table, int write,
2378 void __user *buffer, size_t *lenp, loff_t *ppos)
2381 unsigned long tmptaint = get_taint();
2384 if (write && !capable(CAP_SYS_ADMIN))
2389 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2395 * Poor man's atomic or. Not worth adding a primitive
2396 * to everyone's atomic.h for this
2399 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2400 if ((tmptaint >> i) & 1)
2408 #ifdef CONFIG_PRINTK
2409 static int proc_dmesg_restrict(struct ctl_table *table, int write,
2410 void __user *buffer, size_t *lenp, loff_t *ppos)
2412 if (write && !capable(CAP_SYS_ADMIN))
2415 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2419 struct do_proc_dointvec_minmax_conv_param {
2424 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2426 int write, void *data)
2428 struct do_proc_dointvec_minmax_conv_param *param = data;
2430 int val = *negp ? -*lvalp : *lvalp;
2431 if ((param->min && *param->min > val) ||
2432 (param->max && *param->max < val))
2439 *lvalp = (unsigned long)-val;
2442 *lvalp = (unsigned long)val;
2449 * proc_dointvec_minmax - read a vector of integers with min/max values
2450 * @table: the sysctl table
2451 * @write: %TRUE if this is a write to the sysctl file
2452 * @buffer: the user buffer
2453 * @lenp: the size of the user buffer
2454 * @ppos: file position
2456 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2457 * values from/to the user buffer, treated as an ASCII string.
2459 * This routine will ensure the values are within the range specified by
2460 * table->extra1 (min) and table->extra2 (max).
2462 * Returns 0 on success.
2464 int proc_dointvec_minmax(struct ctl_table *table, int write,
2465 void __user *buffer, size_t *lenp, loff_t *ppos)
2467 struct do_proc_dointvec_minmax_conv_param param = {
2468 .min = (int *) table->extra1,
2469 .max = (int *) table->extra2,
2471 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2472 do_proc_dointvec_minmax_conv, ¶m);
2475 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2476 void __user *buffer,
2477 size_t *lenp, loff_t *ppos,
2478 unsigned long convmul,
2479 unsigned long convdiv)
2481 unsigned long *i, *min, *max;
2482 int vleft, first = 1, err = 0;
2483 unsigned long page = 0;
2487 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2492 i = (unsigned long *) data;
2493 min = (unsigned long *) table->extra1;
2494 max = (unsigned long *) table->extra2;
2495 vleft = table->maxlen / sizeof(unsigned long);
2499 if (left > PAGE_SIZE - 1)
2500 left = PAGE_SIZE - 1;
2501 page = __get_free_page(GFP_TEMPORARY);
2502 kbuf = (char *) page;
2505 if (copy_from_user(kbuf, buffer, left)) {
2512 for (; left && vleft--; i++, first = 0) {
2518 left -= proc_skip_spaces(&kbuf);
2520 err = proc_get_long(&kbuf, &left, &val, &neg,
2522 sizeof(proc_wspace_sep), NULL);
2527 if ((min && val < *min) || (max && val > *max))
2531 val = convdiv * (*i) / convmul;
2533 err = proc_put_char(&buffer, &left, '\t');
2534 err = proc_put_long(&buffer, &left, val, false);
2540 if (!write && !first && left && !err)
2541 err = proc_put_char(&buffer, &left, '\n');
2543 left -= proc_skip_spaces(&kbuf);
2548 return err ? : -EINVAL;
2555 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2556 void __user *buffer,
2557 size_t *lenp, loff_t *ppos,
2558 unsigned long convmul,
2559 unsigned long convdiv)
2561 return __do_proc_doulongvec_minmax(table->data, table, write,
2562 buffer, lenp, ppos, convmul, convdiv);
2566 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2567 * @table: the sysctl table
2568 * @write: %TRUE if this is a write to the sysctl file
2569 * @buffer: the user buffer
2570 * @lenp: the size of the user buffer
2571 * @ppos: file position
2573 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2574 * values from/to the user buffer, treated as an ASCII string.
2576 * This routine will ensure the values are within the range specified by
2577 * table->extra1 (min) and table->extra2 (max).
2579 * Returns 0 on success.
2581 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2582 void __user *buffer, size_t *lenp, loff_t *ppos)
2584 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2588 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2589 * @table: the sysctl table
2590 * @write: %TRUE if this is a write to the sysctl file
2591 * @buffer: the user buffer
2592 * @lenp: the size of the user buffer
2593 * @ppos: file position
2595 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2596 * values from/to the user buffer, treated as an ASCII string. The values
2597 * are treated as milliseconds, and converted to jiffies when they are stored.
2599 * This routine will ensure the values are within the range specified by
2600 * table->extra1 (min) and table->extra2 (max).
2602 * Returns 0 on success.
2604 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2605 void __user *buffer,
2606 size_t *lenp, loff_t *ppos)
2608 return do_proc_doulongvec_minmax(table, write, buffer,
2609 lenp, ppos, HZ, 1000l);
2613 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2615 int write, void *data)
2618 if (*lvalp > LONG_MAX / HZ)
2620 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2626 lval = (unsigned long)-val;
2629 lval = (unsigned long)val;
2636 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2638 int write, void *data)
2641 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2643 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2649 lval = (unsigned long)-val;
2652 lval = (unsigned long)val;
2654 *lvalp = jiffies_to_clock_t(lval);
2659 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2661 int write, void *data)
2664 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2670 lval = (unsigned long)-val;
2673 lval = (unsigned long)val;
2675 *lvalp = jiffies_to_msecs(lval);
2681 * proc_dointvec_jiffies - read a vector of integers as seconds
2682 * @table: the sysctl table
2683 * @write: %TRUE if this is a write to the sysctl file
2684 * @buffer: the user buffer
2685 * @lenp: the size of the user buffer
2686 * @ppos: file position
2688 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2689 * values from/to the user buffer, treated as an ASCII string.
2690 * The values read are assumed to be in seconds, and are converted into
2693 * Returns 0 on success.
2695 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2696 void __user *buffer, size_t *lenp, loff_t *ppos)
2698 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2699 do_proc_dointvec_jiffies_conv,NULL);
2703 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2704 * @table: the sysctl table
2705 * @write: %TRUE if this is a write to the sysctl file
2706 * @buffer: the user buffer
2707 * @lenp: the size of the user buffer
2708 * @ppos: pointer to the file position
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/USER_HZ seconds, and
2713 * are converted into jiffies.
2715 * Returns 0 on success.
2717 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2718 void __user *buffer, size_t *lenp, loff_t *ppos)
2720 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2721 do_proc_dointvec_userhz_jiffies_conv,NULL);
2725 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2726 * @table: the sysctl table
2727 * @write: %TRUE if this is a write to the sysctl file
2728 * @buffer: the user buffer
2729 * @lenp: the size of the user buffer
2730 * @ppos: file position
2731 * @ppos: the current position in the file
2733 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2734 * values from/to the user buffer, treated as an ASCII string.
2735 * The values read are assumed to be in 1/1000 seconds, and
2736 * are converted into jiffies.
2738 * Returns 0 on success.
2740 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2741 void __user *buffer, size_t *lenp, loff_t *ppos)
2743 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2744 do_proc_dointvec_ms_jiffies_conv, NULL);
2747 static int proc_do_cad_pid(struct ctl_table *table, int write,
2748 void __user *buffer, size_t *lenp, loff_t *ppos)
2750 struct pid *new_pid;
2754 tmp = pid_vnr(cad_pid);
2756 r = __do_proc_dointvec(&tmp, table, write, buffer,
2757 lenp, ppos, NULL, NULL);
2761 new_pid = find_get_pid(tmp);
2765 put_pid(xchg(&cad_pid, new_pid));
2770 * proc_do_large_bitmap - read/write from/to a large bitmap
2771 * @table: the sysctl table
2772 * @write: %TRUE if this is a write to the sysctl file
2773 * @buffer: the user buffer
2774 * @lenp: the size of the user buffer
2775 * @ppos: file position
2777 * The bitmap is stored at table->data and the bitmap length (in bits)
2780 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2781 * large bitmaps may be represented in a compact manner. Writing into
2782 * the file will clear the bitmap then update it with the given input.
2784 * Returns 0 on success.
2786 int proc_do_large_bitmap(struct ctl_table *table, int write,
2787 void __user *buffer, size_t *lenp, loff_t *ppos)
2791 size_t left = *lenp;
2792 unsigned long bitmap_len = table->maxlen;
2793 unsigned long *bitmap = (unsigned long *) table->data;
2794 unsigned long *tmp_bitmap = NULL;
2795 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2797 if (!bitmap_len || !left || (*ppos && !write)) {
2803 unsigned long page = 0;
2806 if (left > PAGE_SIZE - 1)
2807 left = PAGE_SIZE - 1;
2809 page = __get_free_page(GFP_TEMPORARY);
2810 kbuf = (char *) page;
2813 if (copy_from_user(kbuf, buffer, left)) {
2819 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2825 proc_skip_char(&kbuf, &left, '\n');
2826 while (!err && left) {
2827 unsigned long val_a, val_b;
2830 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2834 if (val_a >= bitmap_len || neg) {
2846 err = proc_get_long(&kbuf, &left, &val_b,
2847 &neg, tr_b, sizeof(tr_b),
2851 if (val_b >= bitmap_len || neg ||
2862 while (val_a <= val_b)
2863 set_bit(val_a++, tmp_bitmap);
2866 proc_skip_char(&kbuf, &left, '\n');
2870 unsigned long bit_a, bit_b = 0;
2873 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2874 if (bit_a >= bitmap_len)
2876 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2880 err = proc_put_char(&buffer, &left, ',');
2884 err = proc_put_long(&buffer, &left, bit_a, false);
2887 if (bit_a != bit_b) {
2888 err = proc_put_char(&buffer, &left, '-');
2891 err = proc_put_long(&buffer, &left, bit_b, false);
2899 err = proc_put_char(&buffer, &left, '\n');
2905 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2907 memcpy(bitmap, tmp_bitmap,
2908 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2920 #else /* CONFIG_PROC_FS */
2922 int proc_dostring(struct ctl_table *table, int write,
2923 void __user *buffer, size_t *lenp, loff_t *ppos)
2928 int proc_dointvec(struct ctl_table *table, int write,
2929 void __user *buffer, size_t *lenp, loff_t *ppos)
2934 int proc_dointvec_minmax(struct ctl_table *table, int write,
2935 void __user *buffer, size_t *lenp, loff_t *ppos)
2940 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2941 void __user *buffer, size_t *lenp, loff_t *ppos)
2946 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2947 void __user *buffer, size_t *lenp, loff_t *ppos)
2952 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2953 void __user *buffer, size_t *lenp, loff_t *ppos)
2958 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2959 void __user *buffer, size_t *lenp, loff_t *ppos)
2964 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2965 void __user *buffer,
2966 size_t *lenp, loff_t *ppos)
2972 #endif /* CONFIG_PROC_FS */
2975 * No sense putting this after each symbol definition, twice,
2976 * exception granted :-)
2978 EXPORT_SYMBOL(proc_dointvec);
2979 EXPORT_SYMBOL(proc_dointvec_jiffies);
2980 EXPORT_SYMBOL(proc_dointvec_minmax);
2981 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2982 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2983 EXPORT_SYMBOL(proc_dostring);
2984 EXPORT_SYMBOL(proc_doulongvec_minmax);
2985 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2986 EXPORT_SYMBOL(register_sysctl_table);
2987 EXPORT_SYMBOL(register_sysctl_paths);
2988 EXPORT_SYMBOL(unregister_sysctl_table);